US20130056152A1 - Adhesive tape and solar cell module using the same - Google Patents

Adhesive tape and solar cell module using the same Download PDF

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Publication number
US20130056152A1
US20130056152A1 US13/667,869 US201213667869A US2013056152A1 US 20130056152 A1 US20130056152 A1 US 20130056152A1 US 201213667869 A US201213667869 A US 201213667869A US 2013056152 A1 US2013056152 A1 US 2013056152A1
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United States
Prior art keywords
adhesive
solar battery
metal foil
battery cells
resin
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US13/667,869
Inventor
Naoki Fukushima
Takehiro Shimizu
Takahiro Fukutomi
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Showa Denko Materials Co ltd
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Hitachi Chemical Co Ltd
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Application filed by Hitachi Chemical Co Ltd filed Critical Hitachi Chemical Co Ltd
Priority to US13/667,869 priority Critical patent/US20130056152A1/en
Assigned to HITACHI CHEMICAL COMPANY, LTD. reassignment HITACHI CHEMICAL COMPANY, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHIMIZU, TAKEHIRO, FUKUSHIMA, NAOKI, FUKUTOMI, TAKAHIRO
Publication of US20130056152A1 publication Critical patent/US20130056152A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0512—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module made of a particular material or composition of materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C09J9/02—Electrically-conducting adhesives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2804—Next to metal

Definitions

  • the present invention relates to an adhesive tape for electrically connecting a plurality of solar battery cells and a solar battery module using the same.
  • Solar battery modules are solar photovoltaic power generation apparatuses to directly convert light energy to an electric energy.
  • the solar battery modules attract attention as a clean energy in resent years, and their market is anticipated to rapidly expand from now.
  • Such solar battery modules generally have a structure in which a plurality of solar battery cells are electrically connected.
  • solders As methods of electrically connecting solar battery cells, methods using solders are conventionally known (for example, see Patent Documents 1 and 2). Solders are broadly used because they are excellent in connection reliability such as conductivity and fixing strength, and inexpensive and versatile.
  • connection methods using solders since a high temperature (the fusing temperature of solders is usually 230 to 260° C.) is involved on connection, volume shrinkage and the like are generated in adherends (solar battery cells), causing characteristic degradation of solar batteries in some cases. There is therefore a problem of the decreased product yield.
  • the price of solar battery cells accounts for nearly 40% of the price of a solar battery module and rapid expansion of the solar battery market is anticipated, so the thickness reduction of solar battery cells will inevitably be demanded in future. Advancement of the thickness reduction of solar battery cells causes warping and cracking in the solar battery cells due to a high temperature involved on connection, and also raises a problem of a remarkably decreased product yield.
  • connection methods using a solder it is difficult to control the thickness of the connection interface with an adherend because of solder characteristics, and it is difficult to provide a sufficient dimensional precision on packaging.
  • the case where a sufficient dimensional precision is not provided leads to a decrease in the product yield on the packaging process.
  • methods using a conductive adhesive are suitable for the electric connection of thickness-reduced solar battery cells because the connection can be performed at a lower temperature than methods using a solder.
  • conventional methods using a conductive adhesive necessitate a process to transfer the conductive adhesive to an adherend, and have a problem of a low connection workability of solar battery cells.
  • the present invention has been achieved in consideration of the above-mentioned situations, and has an object to provide an adhesive tape which can suppress the decrease in the product yield and can improve the connection workability of solar battery cells, and a solar battery module using the adhesive tape.
  • the present invention provides an adhesive tape for electrically connecting a plurality of solar battery cells, which adhesive tape has a metal foil and an adhesive layer composed of an adhesive provided on at least one surface of the metal foil.
  • the adhesive tape of the present invention since an adhesive layer is provided on at least one surface of a metal foil, when solar battery cells are connected, the work of transferring an adhesive layer on an insulating base material from the base material to each solar battery cell can be omitted. Further, the connection can be performed at a sufficiently lower temperature than in cases of connecting solar battery cells using a solder. Therefore, warping and cracking of solar battery cells on connection can be sufficiently prevented and the yield of solar battery modules can be sufficiently enhanced in its turn.
  • the adhesive preferably contains conductive particles. With this, a plurality of solar battery cells can easily be electrically connected.
  • the adhesive preferably contains further a thermosetting resin for improving the connection reliability after the connection.
  • the metal foil is preferably a copper foil or an aluminum foil because of its excellent conductivity.
  • the adhesive layers are preferably provided on both surfaces of a metal foil.
  • the present invention further provides a solar battery module which has a plurality of solar battery cells, which cells are electrically connected through a connection member, which member is formed using the above-mentioned adhesive tape. Since such a solar battery module uses the adhesive tape of the present invention, the product yield can be enhanced and the connection workability of solar battery cells can be improved. Therefore, the cost reduction on fabricating solar battery modules can be achieved.
  • an adhesive tape which can suppress the decrease in the product yield and can improve the connection workability of solar battery cells, and a solar battery module using the adhesive tape.
  • FIG. 1 is an illustrative sectional view showing an embodiment of an adhesive tape according to the present invention.
  • FIG. 2 is an illustrative sectional view showing another embodiment of an adhesive tape according to the present invention.
  • FIG. 3 is a partial plan view showing an embodiment of the solar battery module according to the present invention.
  • FIG. 4 is a bottom view of the solar battery module in FIG. 3 .
  • FIG. 5 is a sectional view taken on line V-V of FIG. 3 .
  • FIG. 1 is an illustrative sectional view showing a first embodiment of an adhesive tape according to the present invention.
  • the adhesive tape 10 shown in FIG. 1 has a structure having an adhesive layer 2 provided on one surface of a metal foil 1 .
  • FIG. 2 is an illustrative sectional view showing a second embodiment of an adhesive tape according to the present invention.
  • the adhesive tape 20 shown in FIG. 2 has a structure having adhesive layers 2 a and 2 b provided on both surfaces of a metal foil 1 .
  • the adhesive layers 2 , 2 a and 2 b are each composed of an adhesive containing a conductive particle 3 and an insulating adhesive composition 4 .
  • the adhesive layers 2 , 2 a and 2 b may not contain a conductive particle 3 . That is, in the case where a metal foil 1 and an electrode of a solar battery cell described later can directly be contacted by pressing the metal foil 1 to the electrode of the solar battery cell though an adhesive layer, the adhesive layers 2 , 2 a and 2 b may not contain a conductive particle.
  • the adhesive layers 2 , 2 a and 2 b contain a conductive particle 3 allows for more stably electrically connecting solar battery cells.
  • the metal foil 1 includes, for example, a foil of copper, aluminum, iron, gold, silver, nickel, palladium, chromium and molybdenum or an alloy thereof. Above all, copper foil and aluminum foil are preferable because of their excellent conductivity.
  • the thickness of such a metal foil 1 is preferably 10 to 200 ⁇ m in view of the connection reliability and the like.
  • the conductive particle 3 includes, for example, a gold particle, silver particle, copper particle, nickel particle, gold-plated nickel particle, gold/nickel-plated plastic particle, copper-plated particle and nickel-plated particle.
  • These conductive particles preferably have a chestnut shape or a spherical shape in view of the embeddability of the conductive particle in the irregularity of an adherend surface on connection. That is, the chestnut-shaped or sphere-shaped conductive particle is preferable because it has a high embeddability in a complicate irregular shape of an adherend surface and a high followability to fluctuations such as vibration and expansion after connection.
  • Such a conductive particle has preferably an average particle size of 2 to 20 ⁇ m in view of securing the conductivity.
  • the content of the conductive particle is preferably 0.1 to 20% by volume to the whole adhesive volume. With the content of the conductive particle of less than 0.1% by volume, the conductive particle is likely not to sufficiently exhibit an effect on the connection stability. By contrast, with the content of the conductive particle exceeding 20% by volume, the formability of the adhesive layer is likely to decrease.
  • the insulating adhesive composition 4 to be usable is a thermoplastic material or a material exhibiting curability to heat and light.
  • the insulating adhesive composition 4 preferably contains a thermosetting resin in view of improving the connection reliability at a high temperature and high humidity after connection.
  • the thermosetting resin includes, for example, epoxy resins, polyimide resins, unsaturated polyester resins, polyurethane resins, bismaleimide resins, triazine-bismaleimide resins and phenol resins. Above all, epoxy resins are preferable in view of improving heat resistance.
  • the epoxy resin includes bisphenol epoxy resins derived from epichlorohydrin, and bisphenol A, bisphenol F, bisphenol AD, and/or bisphenol AF or the like; epoxy novolac resins derived from epichlorohydrin, and phenol novolacs and/or cresol novolacs; naphthalene epoxy resins having a skeleton containing a naphthalene ring; and various types of epoxy compounds having two or more glycidyl groups in one molecule, such as glycidylamines, glycidyl ethers, biphenyls and alicyclics. These are used singly or as a mixture of two or more.
  • thermosetting resin is preferably 10 to 80% by mass, more preferably 15 to 70% by mass, to the total amount of the insulating adhesive composition 4 .
  • content of less than 10% by mass the fluidity and workability of the adhesive is likely to decrease as compared with cases in the above-mentioned range.
  • content exceeding 80% by mass the adhesiveness of the adhesive tape is likely to decrease as compared with cases in the above-mentioned range.
  • the insulating adhesive composition 4 may further contain a curing agent for a thermosetting resin with the thermosetting resin.
  • a curing agent for a thermosetting resin indicates a curing agent to promote curing of the thermosetting resin when it is heated together with the thermosetting resin.
  • Specific examples include imidazole curing agents, hydrazide curing agents, amine curing agents, phenol curing agents, acid anhydride curing agents, boron trifluoride-amine complexes, sulfonium salts, iodonium salts, polyamine salts, amine imides and dicyandiamide.
  • thermosetting resin when an epoxy resin is used as a thermosetting resin, among these suitably used are imidazole curing agents, hydrazide curing agents, boron trifluoride-amine complexes, sulfonium salts, amine imides, polyamine salts and dicyandiamide.
  • the content of such a curing agent for a thermosetting resin is preferably 2 to 10% by mass, more preferably 4 to 8% by mass, to the total amount of the insulating adhesive composition 4 .
  • the content of less than 2% by mass the adhesiveness of the adhesive tape is likely to decrease as compared with cases in the above-mentioned range.
  • the content exceeding 10% by mass the stability when the adhesive tape is preserved is likely to decrease as compared with cases in the above-mentioned range.
  • the adhesive layers 2 , 2 a and 2 b are preferably film-shaped in view of the layer thickness precision and the pressure distribution on pressure bonding.
  • the insulating adhesive composition 4 constituting the adhesive layers 2 , 2 a and 2 b further contains a film forming material other than the above-mentioned thermosetting resin and curing agent for the thermosetting resin.
  • the film forming material is preferably a thermoplastic polymer such as a phenoxy resin, a polyester resin and a polyamide resin, more preferably a phenoxy resin, in view of the better film formability.
  • the weight-average molecular weight of these film-formable polymers is preferably 10,000 to 10,000,000 in view of the fluidity of the adhesive film. With the weight-average molecular weight of the film-formable polymer of less than 10,000, the formability of the adhesive layer 2 is likely to decrease as compared with cases in the above-mentioned range. With the weight-average molecular weight of the film-formable polymer exceeding 10,000,000, the stress relaxation effect and the workability on curing of the adhesive layer are likely to decrease as compared with cases in the above-mentioned range.
  • the content of such a film-formable polymer is preferably 2 to 80% by mass, more preferably 5 to 70% by mass, to the total amount of the insulating adhesive composition 4 .
  • the content of the film-formable polymer of less than 2% by mass, the stress relaxation effect and the adhesiveness improvement effect on curing are likely to decrease and with the content exceeding 80% by mass, the fluidity and the workability of the adhesive layer are likely to decrease as compared with cases in the above-mentioned range.
  • the insulating adhesive composition 4 may further contain additives such as a coupling agent, a dispersant and a chelate material.
  • a coupling agent is used for improving the adhesiveness and wettability with an adherend.
  • Specific examples thereof include silane coupling agents and titanate coupling agents.
  • a dispersant is used for improving the dispersibility of the conductive particle 3 .
  • Specific examples thereof include calcium phosphate and calcium carbonate.
  • a chelate material is used for suppressing metal migration and the like of silver, copper and the like.
  • Specific examples thereof include inorganic ion exchangers.
  • the content is preferably 0.1 to 10% by mass, more preferably 0.2 to 8% by mass, to the total amount of the insulating adhesive composition 4 .
  • the content of less than 0.1% by mass an effect of containing the additive is small as compared with cases in above-mentioned range.
  • the content exceeding 10% by mass the stability when the adhesive tape is preserved is likely to decrease as compared with cases in the above-mentioned range.
  • the insulating adhesive composition 4 may contain a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator.
  • thermoplastic resin to be usable is polyamides, phenoxy resins, poly(meth)acrylates, polyimides, polyurethanes, polyesters and polyvinylbutyrals. These resins may be used, as required, singly or as a mixture of two or more.
  • the common weight-average molecular weight of these thermoplastic resins is 5,000 to 150,000.
  • the radically polymerizable compound to be usable is not especially limited, and includes well-known compounds as long as they are compounds having an olefin in their molecule such as a (meth)acryl group, a (meth)acryloyl group and a vinyl group. Above all, radically polymerizable compounds having a (meth)acryloyl group are preferable.
  • radically polymerizable compounds include oligomers such as epoxy(meth)acrylate oligomers, urethane(meth)acrylate oligomers, polyether(meth)acrylate oligomers and polyester(meth)acrylate oligomers, and polyfunctional(meth)acrylate compounds such as trimethylolpropane tri(meth)acrylate, polyethylene glycol di(meth)acrylates, polyalkylene glycol di(meth)acrylates, dicyclopentenyl(meth)acrylate, dicyclopentenyloxyethyl(meth)acrylate, neopentyl glycol di(meth)acrylate, dipentaerythritol hexa(meth)acrylate, isocyanuric acid-modified bifunctional (meth)acrylate, isocyanuric acid-modified trifunctional (meth)acrylate, 2,2′-di(meth)acryloyloxydiethyl phosphate and 2-(meth)acryl
  • the radically polymerizable initiators to be usable include conventionally well-known compounds such as peroxides and azo compounds, and specifically include cumyl peroxyneodecanoate, 1,1,3,3-tetramethylbutyl peroxyneodecanoate, 1-cyclohexyl-1-methylethyl peroxyneodecanoate, t-hexyl peroxyneodecanoate, t-butyl peroxyneodecanoate, t-butyl peroxypivalate, 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate, 2,5-dimethyl-2,5-di(2-ethylhexanoylperoxy)hexane, t-hexyl peroxy-2-ethylhexanoate, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxyneoheptanoate,
  • the insulating adhesive composition 4 containing a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator may further contain additives, as required.
  • the thickness of the above-mentioned adhesive layers 2 , 2 a and 2 b is preferably 5 to 50 ⁇ m in consideration of the adhesiveness and the conductivity. Further, the thickness thereof 2 , 2 a and 2 b is more preferably 8 to 40 ⁇ m in consideration of the connection reliability. The thickness thereof 2 , 2 a and 2 b can be controlled by adjustment of the amount of involatile components in an adhesive and adjustment of the gap of an applicator or a lip coater.
  • Such an adhesive tape can be fabricated by a conventional well-known method, for example, the following method.
  • An adhesive composition containing constituents of the above-mentioned insulating adhesive composition 4 is dissolved or dispersed in an organic solvent to liquefy the composition, to prepare a coating liquid.
  • the coating liquid is applied on one surface or both surfaces of a metal foil, and thereafter, the solvent is removed to form an adhesive layer(s).
  • the constituents of the insulating adhesive composition 4 include a thermosetting resin and a curing agent for the thermosetting resin
  • the coating liquid is dried at a temperature of less than the activity temperature of the curing agent.
  • the metal foil having the adhesive layer(s) formed on one surface or both surfaces thereof in such a way is slit into an appropriate width to obtain the above-mentioned adhesive tape.
  • the organic solvent usable at this time includes, for example, ester solvents such as ethyl acetate.
  • the coating liquid can be applied using a coating device such as a roll coater, a slit die coater, a dip coater, a spin coater, an applicator or a lip coater.
  • a coating device such as a roll coater, a slit die coater, a dip coater, a spin coater, an applicator or a lip coater.
  • an adhesive layer is formed on one surface of the metal foil, and thereafter, an adhesive layer may be formed on the other surface thereof; or a coating liquid may be applied on both surfaces of a metal foil using a dip coater or the like, and thereafter, is dried.
  • the adhesive tape of the present invention can be suitably used for connection of solar battery cells.
  • solar battery modules generally, a plurality of solar battery cells equipped with surface electrodes are in series and/or parallelly connected.
  • the connected solar battery cells are interposed by tempered glass or the like for environment resistance and a gap between the solar battery cell and the tempered glass is filled with a transparent resin.
  • the adhesive tape of the present invention is especially suitably used for applications to connect a plurality of solar battery cells in series and/or parallelly.
  • the solar battery module of the present invention has a plurality of solar battery cells, which are electrically connected using the above-mentioned adhesive tape.
  • FIGS. 3 , 4 and 5 are diagrams showing principal parts of a solar battery module according to an embodiment of the present invention, and show the structural outlines in which a plurality of solar battery cells are connected to one another.
  • FIG. 3 is a partially broken plan view of the solar battery module according to the embodiment;
  • FIG. 4 is a partially broken bottom view of the solar battery module in FIG. 3 ;
  • FIG. 5 is a sectional view taken on line V-V in FIG. 3 .
  • a connection member 120 described later is partially broken.
  • the solar battery module 100 has a plurality of solar battery cells 101 .
  • Each solar battery cell 101 has a power generating section 6 .
  • the power generating section 6 generates an electromotive force by solar light, and for example, is formed using a semiconductor wafer.
  • a plurality of finger electrodes 7 (in FIGS. 3 to 5 , six finger electrodes) are parallelly provided.
  • a plurality of bus electrodes 5 a (in FIGS. 3 to 5 , two bus electrodes) are provided so as to intersect the finger electrodes 7 .
  • the finger electrodes 7 and the bus electrodes 5 a are contacted.
  • a rear surface electrode 8 is provided, on which 8 a plurality of bus electrodes 5 b (in FIGS. 3 to 5 , two bus electrodes) are provided. Then, the rear surface electrode 8 and the bus electrodes 5 b are contacted.
  • connection member 120 two solar battery cells 101 are connected through a connection member 120 .
  • one end of the connection member 120 is connected to the bus electrodes 5 a of one solar battery cell 101 ; and the other end of the connection member 120 is connected to the bus electrodes 5 b of the other solar battery cell 101 . That is, the solar battery cells 101 are connected in series.
  • the connection member 120 is constituted of a metal foil 1 and connection layers 102 a , 102 b provided on both surfaces thereof, respectively.
  • the layer contacting with the bus electrodes 5 b is the connection layer 102 a ; and the layer contacting with the bus electrodes 5 a is the connection layer 102 b.
  • connection member 120 is formed using an adhesive tape 20 .
  • the connection layers 102 a , 102 b correspond to the adhesive layers 2 a , 2 b in the adhesive tape 20 , respectively.
  • constituents of the insulating adhesive composition 4 include a thermosetting resin and a curing agent for the thermosetting resin
  • portions of the connection layers 102 a , 102 b corresponding to at least the bus electrodes 5 a , 5 b have been subjected to a curing process by a method described later or the like. Therefore, portions of the connection layers 102 a , 102 b corresponding to at least the bus electrodes 5 a , 5 b are each constituted of a conductive particle 3 and a cured body of the insulating adhesive composition 4 .
  • the solar battery cells 101 connected through the above-mentioned connection member 120 are interposed by tempered glass (not shown in figure) or the like and a gap between the solar battery cells 101 and the tempered glass is filled with a transparent resin (not shown in figure).
  • a material for the semiconductor wafer includes, for example, a semiconductor of a single crystal, polycrystal and non-crystal of silicon.
  • Materials for the finger electrodes 7 , the bus electrodes 5 a and 5 b , and the rear surface electrode 8 include common well-known materials having conductivity, for example, a glass paste containing silver, a silver paste, gold paste, carbon paste, nickel paste and aluminum paste, in which various types of conductive particles are dispersed in an adhesive resin, and ITO formed by baking or deposition. Above all, an electrode composed of a glass paste containing silver is suitably used in view of the heat resistance, conductivity, stability and costs.
  • the finger electrodes 7 , the bus electrodes 5 a and 5 b , and the rear surface electrode 8 can be formed, for example, by screen printing.
  • constituents of the insulating adhesive composition 4 include a thermosetting resin and a curing agent for the thermosetting resin
  • the above-mentioned curing process of the adhesive tape 20 can be performed by heat pressing, for example, at 140 to 200° C. and 0.5 to 4 MPa for 5 to 20 sec.
  • constituents of the insulating adhesive composition 4 include a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator
  • the above-mentioned curing process of the adhesive tape 20 can be performed by heat pressing, for example, at 140 to 200° C. and 0.1 to 10 MPa for 0.5 to 120 sec.
  • This curing process can pressure-bond the adhesive tape 20 to the bus electrodes 5 a and 5 b ; and portions of the adhesive layers 2 a and 2 b in the adhesive tape 20 corresponding to at least the bus electrodes 5 a and 5 b are cured and the adhesive tape 20 becomes the connection member 120 .
  • the solar battery module 100 having such a constitution allows for an enhanced product yield and an improved connection workability of solar battery cells because the above-mentioned tape is used. Thereby, the cost when a solar battery module is fabricated can be reduced.
  • a phenoxy resin high molecular epoxy resin
  • PKHC Union Carbide Chemical & Plastics Technology Corp.
  • an epoxy resin made by Japan Epoxy Resins Co., Ltd., trade name: YL-980
  • imidazole 5 g of imidazole
  • the resultant metal foil was slit into a width of 2.0 mm to obtain an adhesive tape.
  • the thickness of the adhesive layer was measured using a micrometer (made by Mitutoyo Corp., ID-C112).
  • a pressure bonding tool tool name: AC-S300, made by Nikka Equipment & Engineering Co., Ltd.
  • a solar battery cell with an adhesive tape of Example 2 was obtained as in Example 1, except for the thickness of the adhesive layer of 40 ⁇ m.
  • a solar battery cell with an adhesive tape of Example 3 was obtained as in Example 1, except for using gold-plated Ni particles of 5 ⁇ m in average particle size in place of the chestnut-shaped Ni particles of 2.5 ⁇ m in average particle size.
  • a solar battery cell with an adhesive tape of Example 4 was obtained as in Example 1, except for using gold/Ni-plated plastic particles (styrene-butadiene copolymer) of 10 ⁇ m in average particle size of 0.5% by volume to the total volume of the solid components in place of the chestnut-shaped Ni particles of 2.5 ⁇ m in average particle size.
  • gold/Ni-plated plastic particles styrene-butadiene copolymer
  • a solar battery cell with an adhesive tape of Example 5 was obtained as in Example 1, except for using an aluminum foil in place of the copper foil.
  • a solar battery cell with an adhesive tape of Example 6 was obtained as in Example 1, except for using a copper foil of 175 ⁇ m in thickness in place of the copper foil of 75 ⁇ m in thickness.
  • a solar battery cell with an adhesive tape of Example 7 was obtained as in Example 1, except for no addition of the Ni particles.
  • a solar battery cell with an adhesive tape of Comparative Example 1 was obtained by using a TAB wiring in place of an adhesive tape and connecting the Tab wiring and the electrode wiring using a solder.
  • the solar battery cells with an adhesive tape obtained in Examples 1 to 7 and Comparative Example 1 were measured for the F.F. (curve factors) of solar batteries (initial values). Values of the F.F. after exposure of cells to 85° C. and 85% RH for 1,500 hours were also measured (final values).
  • the IV curves were measured using a solar simulator made by Wacom Electric Co., Ltd. (WXS-155S-10, AM1.5G) and a value obtained by subtracting a final value from an initial value was defined as a Delta (F.F.).
  • a solar simulator made by Wacom Electric Co., Ltd. (WXS-155S-10, AM1.5G)
  • a value obtained by subtracting a final value from an initial value was defined as a Delta (F.F.).
  • the Delta (F.F.) is not less than 0.2, the connection reliability is not sufficient.
  • the cell yield indicates a proportion (%) obtained by excepting cases exhibiting cracks and exfoliations in 10 sheets of the solar battery cells as a result of observing cell situations after the adhesive tape was pressure bonded.
  • the adhesive layer formability was evaluated as A when there was observed no fault of not less than 450 ⁇ m; and it was evaluated as B when there were observed faults of not less than ⁇ 50 ⁇ m.
  • the adhesive tape formability was evaluated as A when there was observed no floating and exfoliation of the adhesive layer on the metal foil; and it was evaluated as B when there was floating and exfoliation of the adhesive layer on the metal foil.
  • Constitutions of materials of the adhesive tapes in Examples 1 to 7 above are shown in Table 1; and the evaluation results about Examples 1 to 7 and Comparative Example 1 are shown in Table 2.

Abstract

The present invention provides an adhesive tape 10 for electrically connecting a plurality of solar battery cells, which adhesive tape has a metal foil 1 and an adhesive layer 2 composed of an adhesive provided on at least one surface of the metal foil 1, and a solar battery module using the adhesive tape. The adhesive tape of the present invention can suppress the decrease in the product yield and can improve the connection workability of solar battery cells.

Description

    TECHNICAL FIELD
  • The present invention relates to an adhesive tape for electrically connecting a plurality of solar battery cells and a solar battery module using the same.
    • BACKGROUND ART
  • Solar battery modules are solar photovoltaic power generation apparatuses to directly convert light energy to an electric energy. The solar battery modules attract attention as a clean energy in resent years, and their market is anticipated to rapidly expand from now. Such solar battery modules generally have a structure in which a plurality of solar battery cells are electrically connected.
  • As methods of electrically connecting solar battery cells, methods using solders are conventionally known (for example, see Patent Documents 1 and 2). Solders are broadly used because they are excellent in connection reliability such as conductivity and fixing strength, and inexpensive and versatile.
  • On the other hand, as methods of electrically connecting solar battery cells without using solders, methods using a conductive adhesive are also disclosed (for example, see Patent Documents 3, 4, 5 and 6).
    • Patent Document 1: Japanese Patent Laid-Open No. 2004-204256
    • Patent Document 2: Japanese Patent Laid-Open No. 2005-050780
    • Patent Document 3: Japanese Patent Laid-Open No. 2000-286436
    • Patent Document 4: Japanese Patent Laid-Open No. 2001-357897
    • Patent Document 5: Japanese Patent Laid-Open No. 7-147424
    • Patent Document 6: Japanese Patent Laid-Open No. 2005-101519
    DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
  • However, in connection methods using solders, since a high temperature (the fusing temperature of solders is usually 230 to 260° C.) is involved on connection, volume shrinkage and the like are generated in adherends (solar battery cells), causing characteristic degradation of solar batteries in some cases. There is therefore a problem of the decreased product yield.
  • Particularly in solar battery modules, the price of solar battery cells accounts for nearly 40% of the price of a solar battery module and rapid expansion of the solar battery market is anticipated, so the thickness reduction of solar battery cells will inevitably be demanded in future. Advancement of the thickness reduction of solar battery cells causes warping and cracking in the solar battery cells due to a high temperature involved on connection, and also raises a problem of a remarkably decreased product yield.
  • Further, in connection methods using a solder, it is difficult to control the thickness of the connection interface with an adherend because of solder characteristics, and it is difficult to provide a sufficient dimensional precision on packaging. The case where a sufficient dimensional precision is not provided leads to a decrease in the product yield on the packaging process.
  • On the other hand, methods using a conductive adhesive are suitable for the electric connection of thickness-reduced solar battery cells because the connection can be performed at a lower temperature than methods using a solder. However, conventional methods using a conductive adhesive necessitate a process to transfer the conductive adhesive to an adherend, and have a problem of a low connection workability of solar battery cells.
  • Then, the present invention has been achieved in consideration of the above-mentioned situations, and has an object to provide an adhesive tape which can suppress the decrease in the product yield and can improve the connection workability of solar battery cells, and a solar battery module using the adhesive tape.
    • Means for Solving the Problems
  • The present invention provides an adhesive tape for electrically connecting a plurality of solar battery cells, which adhesive tape has a metal foil and an adhesive layer composed of an adhesive provided on at least one surface of the metal foil.
  • According to the adhesive tape of the present invention, since an adhesive layer is provided on at least one surface of a metal foil, when solar battery cells are connected, the work of transferring an adhesive layer on an insulating base material from the base material to each solar battery cell can be omitted. Further, the connection can be performed at a sufficiently lower temperature than in cases of connecting solar battery cells using a solder. Therefore, warping and cracking of solar battery cells on connection can be sufficiently prevented and the yield of solar battery modules can be sufficiently enhanced in its turn.
  • The adhesive preferably contains conductive particles. With this, a plurality of solar battery cells can easily be electrically connected.
  • The adhesive preferably contains further a thermosetting resin for improving the connection reliability after the connection.
  • The metal foil is preferably a copper foil or an aluminum foil because of its excellent conductivity.
  • In the adhesive tape of the present invention, the adhesive layers are preferably provided on both surfaces of a metal foil. With this, since solar battery cells can be connected to both surfaces of an adhesive tape, solar battery cells can easily be connected in either of series connection and parallel connection.
  • The present invention further provides a solar battery module which has a plurality of solar battery cells, which cells are electrically connected through a connection member, which member is formed using the above-mentioned adhesive tape. Since such a solar battery module uses the adhesive tape of the present invention, the product yield can be enhanced and the connection workability of solar battery cells can be improved. Therefore, the cost reduction on fabricating solar battery modules can be achieved.
    • Effect of the Invention
  • According to the present invention, there are provided an adhesive tape which can suppress the decrease in the product yield and can improve the connection workability of solar battery cells, and a solar battery module using the adhesive tape.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an illustrative sectional view showing an embodiment of an adhesive tape according to the present invention.
  • FIG. 2 is an illustrative sectional view showing another embodiment of an adhesive tape according to the present invention.
  • FIG. 3 is a partial plan view showing an embodiment of the solar battery module according to the present invention.
  • FIG. 4 is a bottom view of the solar battery module in FIG. 3.
  • FIG. 5 is a sectional view taken on line V-V of FIG. 3.
    •  EXPLANATION OF SYMBOLS
  • 1: Metal foil, 2, 2 a, 2 b: adhesive layer, 3: conductive particle, 4: insulating adhesive composition, 5 a, 5 b: bus electrode, 6: power generating section, 7: forger electrode, 8: rear surface electrode, 10, 20: adhesive tape, 100: solar battery module, 101: solar battery cell, 102 a, 102 b: connection layer, 120: connection member.
    • BEST MODES FOR CARRYING OUT THE INVENTION
  • Hereinafter, preferable embodiments of the present invention will be described in detail by way of drawings, but the scope of the present invention is not limited to the following embodiments. In drawings, the same reference character is given to the same element and duplicated description will be omitted. The positional relationship with respect to top and bottom and left and right and the like is based on the positional relationship shown in drawings as long as not otherwise specified. Besides, the dimensional ratios of the drawings are not limited to those shown in the drawings.
  • FIG. 1 is an illustrative sectional view showing a first embodiment of an adhesive tape according to the present invention. The adhesive tape 10 shown in FIG. 1 has a structure having an adhesive layer 2 provided on one surface of a metal foil 1.
  • FIG. 2 is an illustrative sectional view showing a second embodiment of an adhesive tape according to the present invention. The adhesive tape 20 shown in FIG. 2 has a structure having adhesive layers 2 a and 2 b provided on both surfaces of a metal foil 1.
  • The adhesive layers 2, 2 a and 2 b are each composed of an adhesive containing a conductive particle 3 and an insulating adhesive composition 4. In the first and second embodiments, embodiments in which the adhesive layers 2, 2 a and 2 b contain a conductive particle 3 are shown, but the adhesive layers 2, 2 a and 2 b may not contain a conductive particle 3. That is, in the case where a metal foil 1 and an electrode of a solar battery cell described later can directly be contacted by pressing the metal foil 1 to the electrode of the solar battery cell though an adhesive layer, the adhesive layers 2, 2 a and 2 b may not contain a conductive particle. However, that the adhesive layers 2, 2 a and 2 b contain a conductive particle 3 allows for more stably electrically connecting solar battery cells.
  • The metal foil 1 includes, for example, a foil of copper, aluminum, iron, gold, silver, nickel, palladium, chromium and molybdenum or an alloy thereof. Above all, copper foil and aluminum foil are preferable because of their excellent conductivity. The thickness of such a metal foil 1 is preferably 10 to 200 μm in view of the connection reliability and the like.
  • The conductive particle 3 includes, for example, a gold particle, silver particle, copper particle, nickel particle, gold-plated nickel particle, gold/nickel-plated plastic particle, copper-plated particle and nickel-plated particle. These conductive particles preferably have a chestnut shape or a spherical shape in view of the embeddability of the conductive particle in the irregularity of an adherend surface on connection. That is, the chestnut-shaped or sphere-shaped conductive particle is preferable because it has a high embeddability in a complicate irregular shape of an adherend surface and a high followability to fluctuations such as vibration and expansion after connection.
  • Such a conductive particle has preferably an average particle size of 2 to 20 μm in view of securing the conductivity. The content of the conductive particle is preferably 0.1 to 20% by volume to the whole adhesive volume. With the content of the conductive particle of less than 0.1% by volume, the conductive particle is likely not to sufficiently exhibit an effect on the connection stability. By contrast, with the content of the conductive particle exceeding 20% by volume, the formability of the adhesive layer is likely to decrease.
  • The insulating adhesive composition 4 to be usable is a thermoplastic material or a material exhibiting curability to heat and light. The insulating adhesive composition 4 preferably contains a thermosetting resin in view of improving the connection reliability at a high temperature and high humidity after connection. The thermosetting resin includes, for example, epoxy resins, polyimide resins, unsaturated polyester resins, polyurethane resins, bismaleimide resins, triazine-bismaleimide resins and phenol resins. Above all, epoxy resins are preferable in view of improving heat resistance. The epoxy resin includes bisphenol epoxy resins derived from epichlorohydrin, and bisphenol A, bisphenol F, bisphenol AD, and/or bisphenol AF or the like; epoxy novolac resins derived from epichlorohydrin, and phenol novolacs and/or cresol novolacs; naphthalene epoxy resins having a skeleton containing a naphthalene ring; and various types of epoxy compounds having two or more glycidyl groups in one molecule, such as glycidylamines, glycidyl ethers, biphenyls and alicyclics. These are used singly or as a mixture of two or more.
  • The content of such a thermosetting resin is preferably 10 to 80% by mass, more preferably 15 to 70% by mass, to the total amount of the insulating adhesive composition 4. With the content of less than 10% by mass, the fluidity and workability of the adhesive is likely to decrease as compared with cases in the above-mentioned range. With the content exceeding 80% by mass, the adhesiveness of the adhesive tape is likely to decrease as compared with cases in the above-mentioned range.
  • The insulating adhesive composition 4 may further contain a curing agent for a thermosetting resin with the thermosetting resin.
  • A curing agent for a thermosetting resin indicates a curing agent to promote curing of the thermosetting resin when it is heated together with the thermosetting resin. Specific examples include imidazole curing agents, hydrazide curing agents, amine curing agents, phenol curing agents, acid anhydride curing agents, boron trifluoride-amine complexes, sulfonium salts, iodonium salts, polyamine salts, amine imides and dicyandiamide. When an epoxy resin is used as a thermosetting resin, among these suitably used are imidazole curing agents, hydrazide curing agents, boron trifluoride-amine complexes, sulfonium salts, amine imides, polyamine salts and dicyandiamide.
  • The content of such a curing agent for a thermosetting resin is preferably 2 to 10% by mass, more preferably 4 to 8% by mass, to the total amount of the insulating adhesive composition 4. With the content of less than 2% by mass, the adhesiveness of the adhesive tape is likely to decrease as compared with cases in the above-mentioned range. With the content exceeding 10% by mass, the stability when the adhesive tape is preserved is likely to decrease as compared with cases in the above-mentioned range.
  • The adhesive layers 2, 2 a and 2 b are preferably film-shaped in view of the layer thickness precision and the pressure distribution on pressure bonding. In this case, the insulating adhesive composition 4 constituting the adhesive layers 2, 2 a and 2 b further contains a film forming material other than the above-mentioned thermosetting resin and curing agent for the thermosetting resin.
  • The film forming material is preferably a thermoplastic polymer such as a phenoxy resin, a polyester resin and a polyamide resin, more preferably a phenoxy resin, in view of the better film formability. The weight-average molecular weight of these film-formable polymers is preferably 10,000 to 10,000,000 in view of the fluidity of the adhesive film. With the weight-average molecular weight of the film-formable polymer of less than 10,000, the formability of the adhesive layer 2 is likely to decrease as compared with cases in the above-mentioned range. With the weight-average molecular weight of the film-formable polymer exceeding 10,000,000, the stress relaxation effect and the workability on curing of the adhesive layer are likely to decrease as compared with cases in the above-mentioned range.
  • The content of such a film-formable polymer is preferably 2 to 80% by mass, more preferably 5 to 70% by mass, to the total amount of the insulating adhesive composition 4. With the content of the film-formable polymer of less than 2% by mass, the stress relaxation effect and the adhesiveness improvement effect on curing are likely to decrease and with the content exceeding 80% by mass, the fluidity and the workability of the adhesive layer are likely to decrease as compared with cases in the above-mentioned range.
  • The insulating adhesive composition 4, as required, may further contain additives such as a coupling agent, a dispersant and a chelate material.
  • A coupling agent is used for improving the adhesiveness and wettability with an adherend. Specific examples thereof include silane coupling agents and titanate coupling agents. A dispersant is used for improving the dispersibility of the conductive particle 3. Specific examples thereof include calcium phosphate and calcium carbonate. A chelate material is used for suppressing metal migration and the like of silver, copper and the like. Specific examples thereof include inorganic ion exchangers.
  • When these additives are used, the content is preferably 0.1 to 10% by mass, more preferably 0.2 to 8% by mass, to the total amount of the insulating adhesive composition 4. With the content of less than 0.1% by mass, an effect of containing the additive is small as compared with cases in above-mentioned range. With the content exceeding 10% by mass, the stability when the adhesive tape is preserved is likely to decrease as compared with cases in the above-mentioned range.
  • The insulating adhesive composition 4 may contain a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator.
  • The thermoplastic resin to be usable is polyamides, phenoxy resins, poly(meth)acrylates, polyimides, polyurethanes, polyesters and polyvinylbutyrals. These resins may be used, as required, singly or as a mixture of two or more. The common weight-average molecular weight of these thermoplastic resins is 5,000 to 150,000.
  • The radically polymerizable compound to be usable is not especially limited, and includes well-known compounds as long as they are compounds having an olefin in their molecule such as a (meth)acryl group, a (meth)acryloyl group and a vinyl group. Above all, radically polymerizable compounds having a (meth)acryloyl group are preferable.
  • Specific examples of radically polymerizable compounds include oligomers such as epoxy(meth)acrylate oligomers, urethane(meth)acrylate oligomers, polyether(meth)acrylate oligomers and polyester(meth)acrylate oligomers, and polyfunctional(meth)acrylate compounds such as trimethylolpropane tri(meth)acrylate, polyethylene glycol di(meth)acrylates, polyalkylene glycol di(meth)acrylates, dicyclopentenyl(meth)acrylate, dicyclopentenyloxyethyl(meth)acrylate, neopentyl glycol di(meth)acrylate, dipentaerythritol hexa(meth)acrylate, isocyanuric acid-modified bifunctional (meth)acrylate, isocyanuric acid-modified trifunctional (meth)acrylate, 2,2′-di(meth)acryloyloxydiethyl phosphate and 2-(meth)acryloyloxyethyl acid phosphate. These compounds may be used, as required, singly or as a mixture of two or more.
  • The radically polymerizable initiators to be usable include conventionally well-known compounds such as peroxides and azo compounds, and specifically include cumyl peroxyneodecanoate, 1,1,3,3-tetramethylbutyl peroxyneodecanoate, 1-cyclohexyl-1-methylethyl peroxyneodecanoate, t-hexyl peroxyneodecanoate, t-butyl peroxyneodecanoate, t-butyl peroxypivalate, 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate, 2,5-dimethyl-2,5-di(2-ethylhexanoylperoxy)hexane, t-hexyl peroxy-2-ethylhexanoate, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxyneoheptanoate, t-amyl peroxy-2-ethylhexanoate, di-t-butyl peroxyhexahydroterephthalate, t-amyl peroxy-3,5,5-trimethylhexanoate, 3-hydroxy-1,1-dimethylbutyl peroxyneodecanoate, 1,1,3,3-tetramethylbutyl peroxy-2-ethylhexanoate, t-amyl peroxyneodecanoate, t-amyl peroxy-2-ethylhexanoate, 2,2′-azobis-2,4-dimethylvaleronitrile, 1,1′-azobis(1-acetoxy-1-phenylethane), 2,2′-azobisisobutyronitrile, 2,2′-azobis(2-methylbutyronitrile), dimethyl-2,2′-azobisisobutyronitrile, 4,4′-azobis(4-cyanovaleric acid), 1,1′-azobis(1-cyclohexanecarbonitrile), t-hexyl peroxyisopropylmonocarbonate, t-butyl peroxymaleic acid, t-butyl peroxy-3,5,5-trimethylhexanoate, t-butyl peroxylaurate, 2,5-dimethyl-2,5-di(3-methylbenzoylperoxy)hexane, t-butyl peroxy-2-ethylhexylmonocarbonate, t-hexyl peroxybenzoate, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, t-butyl peroxybenzoate, dibutyl peroxytrimethyladipate, t-amyl peroxy-n-octoate, t-amyl peroxyisononanoate and t-amyl peroxybenzoate. These compounds may be used singly or as a mixture of two or more.
  • The insulating adhesive composition 4 containing a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator may further contain additives, as required.
  • The thickness of the above-mentioned adhesive layers 2, 2 a and 2 b is preferably 5 to 50 μm in consideration of the adhesiveness and the conductivity. Further, the thickness thereof 2, 2 a and 2 b is more preferably 8 to 40 μm in consideration of the connection reliability. The thickness thereof 2, 2 a and 2 b can be controlled by adjustment of the amount of involatile components in an adhesive and adjustment of the gap of an applicator or a lip coater.
  • According to the above-mentioned adhesive tape, decrease in product yield can be suppressed and connection workability of solar battery cells can be improved.
  • Such an adhesive tape can be fabricated by a conventional well-known method, for example, the following method.
  • An adhesive composition containing constituents of the above-mentioned insulating adhesive composition 4 is dissolved or dispersed in an organic solvent to liquefy the composition, to prepare a coating liquid. The coating liquid is applied on one surface or both surfaces of a metal foil, and thereafter, the solvent is removed to form an adhesive layer(s). At this time, if the constituents of the insulating adhesive composition 4 include a thermosetting resin and a curing agent for the thermosetting resin, the coating liquid is dried at a temperature of less than the activity temperature of the curing agent. The metal foil having the adhesive layer(s) formed on one surface or both surfaces thereof in such a way is slit into an appropriate width to obtain the above-mentioned adhesive tape.
  • The organic solvent usable at this time includes, for example, ester solvents such as ethyl acetate. The coating liquid can be applied using a coating device such as a roll coater, a slit die coater, a dip coater, a spin coater, an applicator or a lip coater. In the case of fabricating an adhesive tape having adhesive layers formed on both surfaces of a metal foil, an adhesive layer is formed on one surface of the metal foil, and thereafter, an adhesive layer may be formed on the other surface thereof; or a coating liquid may be applied on both surfaces of a metal foil using a dip coater or the like, and thereafter, is dried.
  • The adhesive tape of the present invention can be suitably used for connection of solar battery cells. In solar battery modules, generally, a plurality of solar battery cells equipped with surface electrodes are in series and/or parallelly connected. The connected solar battery cells are interposed by tempered glass or the like for environment resistance and a gap between the solar battery cell and the tempered glass is filled with a transparent resin. The adhesive tape of the present invention is especially suitably used for applications to connect a plurality of solar battery cells in series and/or parallelly.
  • The solar battery module of the present invention has a plurality of solar battery cells, which are electrically connected using the above-mentioned adhesive tape.
  • Here, FIGS. 3, 4 and 5 are diagrams showing principal parts of a solar battery module according to an embodiment of the present invention, and show the structural outlines in which a plurality of solar battery cells are connected to one another. FIG. 3 is a partially broken plan view of the solar battery module according to the embodiment; FIG. 4 is a partially broken bottom view of the solar battery module in FIG. 3; and FIG. 5 is a sectional view taken on line V-V in FIG. 3. In FIG. 3 and FIG. 4, a connection member 120 described later is partially broken.
  • As shown in FIGS. 3, 4 and 5, the solar battery module 100 according to the embodiment has a plurality of solar battery cells 101. Each solar battery cell 101 has a power generating section 6. The power generating section 6 generates an electromotive force by solar light, and for example, is formed using a semiconductor wafer. On the front surface of the power generating section 6, a plurality of finger electrodes 7 (in FIGS. 3 to 5, six finger electrodes) are parallelly provided. On the finger electrodes 7, a plurality of bus electrodes 5 a (in FIGS. 3 to 5, two bus electrodes) are provided so as to intersect the finger electrodes 7. Here, the finger electrodes 7 and the bus electrodes 5 a are contacted.
  • On the other hand, on the rear surface of the power generating section 6, a rear surface electrode 8 is provided, on which 8 a plurality of bus electrodes 5 b (in FIGS. 3 to 5, two bus electrodes) are provided. Then, the rear surface electrode 8 and the bus electrodes 5 b are contacted.
  • Then, two solar battery cells 101 are connected through a connection member 120. Specifically, one end of the connection member 120 is connected to the bus electrodes 5 a of one solar battery cell 101; and the other end of the connection member 120 is connected to the bus electrodes 5 b of the other solar battery cell 101. That is, the solar battery cells 101 are connected in series. The connection member 120 is constituted of a metal foil 1 and connection layers 102 a, 102 b provided on both surfaces thereof, respectively. The layer contacting with the bus electrodes 5 b is the connection layer 102 a; and the layer contacting with the bus electrodes 5 a is the connection layer 102 b.
  • Here, the connection member 120 is formed using an adhesive tape 20. The connection layers 102 a, 102 b correspond to the adhesive layers 2 a, 2 b in the adhesive tape 20, respectively. At this time, if constituents of the insulating adhesive composition 4 include a thermosetting resin and a curing agent for the thermosetting resin, portions of the connection layers 102 a, 102 b corresponding to at least the bus electrodes 5 a, 5 b have been subjected to a curing process by a method described later or the like. Therefore, portions of the connection layers 102 a, 102 b corresponding to at least the bus electrodes 5 a, 5 b are each constituted of a conductive particle 3 and a cured body of the insulating adhesive composition 4.
  • Then, in the solar battery module 100, the solar battery cells 101 connected through the above-mentioned connection member 120 are interposed by tempered glass (not shown in figure) or the like and a gap between the solar battery cells 101 and the tempered glass is filled with a transparent resin (not shown in figure).
  • A material for the semiconductor wafer includes, for example, a semiconductor of a single crystal, polycrystal and non-crystal of silicon.
  • Materials for the finger electrodes 7, the bus electrodes 5 a and 5 b, and the rear surface electrode 8 include common well-known materials having conductivity, for example, a glass paste containing silver, a silver paste, gold paste, carbon paste, nickel paste and aluminum paste, in which various types of conductive particles are dispersed in an adhesive resin, and ITO formed by baking or deposition. Above all, an electrode composed of a glass paste containing silver is suitably used in view of the heat resistance, conductivity, stability and costs. The finger electrodes 7, the bus electrodes 5 a and 5 b, and the rear surface electrode 8 can be formed, for example, by screen printing.
  • If constituents of the insulating adhesive composition 4 include a thermosetting resin and a curing agent for the thermosetting resin, the above-mentioned curing process of the adhesive tape 20 can be performed by heat pressing, for example, at 140 to 200° C. and 0.5 to 4 MPa for 5 to 20 sec. If constituents of the insulating adhesive composition 4 include a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator, the above-mentioned curing process of the adhesive tape 20 can be performed by heat pressing, for example, at 140 to 200° C. and 0.1 to 10 MPa for 0.5 to 120 sec. This curing process can pressure-bond the adhesive tape 20 to the bus electrodes 5 a and 5 b; and portions of the adhesive layers 2 a and 2 b in the adhesive tape 20 corresponding to at least the bus electrodes 5 a and 5 b are cured and the adhesive tape 20 becomes the connection member 120.
  • The solar battery module 100 having such a constitution allows for an enhanced product yield and an improved connection workability of solar battery cells because the above-mentioned tape is used. Thereby, the cost when a solar battery module is fabricated can be reduced.
    • EXAMPLES
  • Then, the present invention will be described in detail by way of Examples, but the scope of the present invention is not limited thereto.
    • Example 1 (1) Fabrication of an Adhesive Tap
  • 50 g of a phenoxy resin (high molecular epoxy resin) (made by Union Carbide Chemical & Plastics Technology Corp., trade name: PKHC), 20 g of an epoxy resin (made by Japan Epoxy Resins Co., Ltd., trade name: YL-980) and 5 g of imidazole were added to ethyl acetate to prepare a 30 mass % ethyl acetate solution; and chestnut-shaped Ni particles of 2.5 μm in average particle size of 5% by volume to the total volume of the solid components were added to the solution. The obtained mixed solution was applied on one surface of a copper foil of 75 μm in thickness using a roll coater. The applied solution was dried at 110° C. for 5 min to obtain a metal foil having an adhesive layer of 30 μm in thickness formed on the one surface. The resultant metal foil was slit into a width of 2.0 mm to obtain an adhesive tape. Here, the thickness of the adhesive layer was measured using a micrometer (made by Mitutoyo Corp., ID-C112).
    • (2) Connection of Solar Battery Cells Using the Adhesive Tape
  • The adhesive tape was aligned in the width direction of the electrode wiring (material: silver glass paste, 2 mm×15 cm, Rz=10 μm, Ry=14 μm) formed on a solar battery cell (thickness: 150 μm, 15 cm×15 cm), and heat pressed at 170° C. and 2 MPa for 20 sec using a pressure bonding tool (tool name: AC-S300, made by Nikka Equipment & Engineering Co., Ltd.) to obtain a solar battery cell with an adhesive tape of Example 1.
    • Example 2
  • A solar battery cell with an adhesive tape of Example 2 was obtained as in Example 1, except for the thickness of the adhesive layer of 40 μm.
    • Example 3
  • A solar battery cell with an adhesive tape of Example 3 was obtained as in Example 1, except for using gold-plated Ni particles of 5 μm in average particle size in place of the chestnut-shaped Ni particles of 2.5 μm in average particle size.
    • Example 4
  • A solar battery cell with an adhesive tape of Example 4 was obtained as in Example 1, except for using gold/Ni-plated plastic particles (styrene-butadiene copolymer) of 10 μm in average particle size of 0.5% by volume to the total volume of the solid components in place of the chestnut-shaped Ni particles of 2.5 μm in average particle size.
    • Example 5
  • A solar battery cell with an adhesive tape of Example 5 was obtained as in Example 1, except for using an aluminum foil in place of the copper foil.
    • Example 6
  • A solar battery cell with an adhesive tape of Example 6 was obtained as in Example 1, except for using a copper foil of 175 μm in thickness in place of the copper foil of 75 μm in thickness.
    • Example 7
  • A solar battery cell with an adhesive tape of Example 7 was obtained as in Example 1, except for no addition of the Ni particles.
    • Comparative Example 1
  • A solar battery cell with an adhesive tape of Comparative Example 1 was obtained by using a TAB wiring in place of an adhesive tape and connecting the Tab wiring and the electrode wiring using a solder.
  • (Evaluation of Solar Batteries)
  • The solar battery cells with an adhesive tape obtained in Examples 1 to 7 and Comparative Example 1 were measured for the F.F. (curve factors) of solar batteries (initial values). Values of the F.F. after exposure of cells to 85° C. and 85% RH for 1,500 hours were also measured (final values). The IV curves were measured using a solar simulator made by Wacom Electric Co., Ltd. (WXS-155S-10, AM1.5G) and a value obtained by subtracting a final value from an initial value was defined as a Delta (F.F.). Here, if the Delta (F.F.) is not less than 0.2, the connection reliability is not sufficient.
  • Further, the cell yield, the adhesive layer formability and the adhesive tape formability were also evaluated. The cell yield indicates a proportion (%) obtained by excepting cases exhibiting cracks and exfoliations in 10 sheets of the solar battery cells as a result of observing cell situations after the adhesive tape was pressure bonded. The adhesive layer formability was evaluated as A when there was observed no fault of not less than 450 μm; and it was evaluated as B when there were observed faults of not less than φ50 μm. The adhesive tape formability was evaluated as A when there was observed no floating and exfoliation of the adhesive layer on the metal foil; and it was evaluated as B when there was floating and exfoliation of the adhesive layer on the metal foil. Constitutions of materials of the adhesive tapes in Examples 1 to 7 above are shown in Table 1; and the evaluation results about Examples 1 to 7 and Comparative Example 1 are shown in Table 2.
  • TABLE 1
    Example Example Example Example Example Example Example
    1 2 3 4 5 6 7
    Insulating Phenoxy 50 50 50 50 50 50 50
    adhesive resin (g)
    Epoxy 20 20 20 20 20 20 20
    resin (g)
    Imidazole 5 5 5 5 5 5 5
    (g)
    Thickness 30 40 30 30 30 30 30
    (μm)
    Conductive Kind Chestnut- Chestnut- Gold- Gold/Ni- Chestnut- Chestnut- None
    particle shaped shaped plated plated plastic shaped shaped
    Ni particle Ni particle Ni particle particle Ni particle Ni particle
    Average 2.5 2.5 5 10 2.5 2.5 —
    particle
    size (μm)
    Content 5 5 5 0.5 5 5 0
    (% by
    volume)
    Metal foil Kind Copper Copper Copper Copper Aluminum Copper Copper
    foil foil foil foil foil foil foil
    Thickness 75 75 75 75 75 175 75
    (μm)
  • TABLE 2
    Example Example Example Example Example Example Example Comparative
    1 2 3 4 5 6 7 Example 1
    Delta (F.F.) 0.03 0.03 0.02 0.04 0.04 0.02 0.05 0.03
    Cell yield (%) 100 100 100 100 100 100 100 60
    Adhesive layer A A A A A A A —
    formability
    Tape formability A A A A A A A —

Claims (27)

1-6. (canceled)
7. A method for producing a solar battery module comprising a plurality of solar battery cells, the method comprising the steps of:
(a) providing a plurality of solar battery cells; and
(b) electrically connecting the plurality of solar battery cells by using adhesive tapes, wherein each adhesive tape comprises a metal foil, and adhesive layers, each comprising an adhesive, provided on at least one surface of the metal foil,
wherein the adhesive comprises an insulating adhesive composition but no conductive particle, and wherein the insulating adhesive composition comprises a film-forming material, a thermosetting resin and a curing agent for the thermosetting resin.
8. The method according to claim 7, wherein the film-forming material is one selected from the group consisting of a phenoxy resin, a polyester resin and a polyamide resin.
9. The method according to claim 7, wherein the film-forming material is a phenoxy resin.
10. The method according to claim 7, wherein a weight-average molecular weight of the film forming material is 10000 to 10000000.
11. The method according to claim 7, wherein the thermosetting resin is an epoxy resin.
12. The method according to claim 7, wherein the metal foil is a copper foil or an aluminum foil.
13. The method according to claim 7, wherein the adhesive layers are provided on both surfaces of the metal foil.
14. A method for producing a solar battery module comprising a plurality of solar battery cells electrically connected through a metal foil, the method comprising the steps of:
(a) providing a plurality of solar battery cells; and
(b) electrically connecting each solar battery cell to a metal foil by using an adhesive, wherein the adhesive comprises an insulating adhesive composition but no conductive particle, and the insulating adhesive composition comprises a film forming material, a thermosetting resin and a curing agent for the thermosetting resin.
15. The method according to claim 14, wherein the adhesive is provided on a surface of the metal foil as adhesive layer, or the adhesive is provided on both surfaces of the metal foil as adhesive layers.
16. The method according to claim 14, wherein the film-forming material is one selected from the group consisting of a phenoxy resin, a polyester resin and a polyamide resin.
17. The method according to claim 14, wherein the film forming material is a phenoxy resin.
18. The method according to claim 14, wherein a weight-average molecular weight of the film forming material is 10000 to 10000000.
19. The method according to claim 14, wherein the thermosetting resin is an epoxy resin.
20. The method according to claim 14, wherein the metal foil is a copper soil or an aluminum foil.
21. A method for producing a solar battery module comprising a plurality of solar battery cells, the method comprising the steps of:
(a) providing a plurality of solar battery cells; and
(b) electrically connecting the plurality of solar battery cells by using adhesive tapes, wherein each adhesive tape comprises a metal foil, and a plurality of adhesive layers, wherein each adhesive layer comprising an adhesive, provided on at least one surface of the metal foil,
wherein the adhesive comprises an Insulating adhesive composition but no conductive particle, and the insulating adhesive composition comprises a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator.
22. The method according to claim 21, wherein the thermoplastic resin is selected from the group consisting of polyamides, phenoxy resins, poly(meth)acrylates, polyimides, polyurethanes, polyesters and polyvinylbutyrals.
23. The method according to claim 21, wherein a weight-average molecular weight of the thermoplastic resin is 5000 to 150000.
24. The method according to claim 21, wherein the radically polymerizable compound has a (meth)acryloyl group.
25. The method according to claim 21, wherein the metal foil is a copper foil or an aluminum foil.
26. The method according to claim 21, wherein the adhesive layers are provided on both surfaces of the metal foil.
27. A method for producing a solar battery module comprising a plurality of solar battery cells electrically connected through a metal foil, the method comprising the steps of:
(a) providing a plurality of solar battery cells; and
(b) electrically connecting each solar battery cell to a metal foil by using an adhesive,
wherein the adhesive comprises an insulating adhesive composition but no conductive particle, and the insulating adhesive composition comprises a thermoplastic resin, a radically polymerizable compound and a radical polymerization initiator.
28. The method according to claim 21, wherein the adhesive is provided on a surface of the metal foil as adhesive layer, or the adhesive is provided on both surfaces of the metal foil as adhesive layers.
29. The method according to claim 21, wherein the thermoplastic resin is selected from the group consisting of polyamides, phenoxy resins, poly(meth)acrylates, polyimides, polyurethanes, polyesters and polyvinylbutyrals.
30. The method according to claim 21, wherein a weight-average molecular weight of the thermoplastic resin is 5000 to 150000.
31. The method according to claim 21, wherein the radically polymerizable compound has a (meth)acryloyl group.
32. The method according to claim 21, wherein the metal foil is a copper foil or an aluminum foil.
US13/667,869 2006-04-26 2012-11-02 Adhesive tape and solar cell module using the same Abandoned US20130056152A1 (en)

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