WO1995019564A1 - Battery capacity indicator - Google Patents
Battery capacity indicator Download PDFInfo
- Publication number
- WO1995019564A1 WO1995019564A1 PCT/US1995/000368 US9500368W WO9519564A1 WO 1995019564 A1 WO1995019564 A1 WO 1995019564A1 US 9500368 W US9500368 W US 9500368W WO 9519564 A1 WO9519564 A1 WO 9519564A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery
- main battery
- sense cell
- current
- cell
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/549—Current
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/44—Control modes by parameter estimation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/50—Control modes by future state prediction
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S320/00—Electricity: battery or capacitor charging or discharging
- Y10S320/18—Indicator or display
- Y10S320/21—State of charge of battery
Definitions
- Batteries are depleted through use. Simply tracking use time or charge transfer is an insufficient measure of remaining battery capacity, however. Batteries lose charge over time even when not in use. In addition, the battery's temperature can affect its capacity and useful life. Furthermore, monitoring the electrical characteristics of a battery, such as voltage or resistance, often does not provide enough information regarding the capacity of the battery.
- This invention relates to a method and apparatus for detecting and indicating a low battery capacity condition for a battery operated device.
- Battery capacity detectors and indicators are known in the art. Most prior art battery capacity indicators are based on one or both of the following two methods: (1) measurement of a battery parameter, and (2) cumulative measurement of battery output. The measurements are typically made in absolute, not relative, terms. The prior art battery capacity indicators also generally include some way to compensate for the environmental effects of time and temperature.
- the apparatus disclosed in Renirie U.S. Patent No. 4,259,639 monitors the resistance of a lithium type battery.
- the Renirie device is based on a theoretical model that divides the effective resistance of the battery into two resistance components.
- the measuring circuit shunts the first resistance component R L by a capacitance so that measurement signal pulses measure only the depletion resistance R d .
- R d will begin to increase near the end of the battery's useful life.
- U.S. Patent No. 4,725,784 discloses a method for determining the state of charge of lithium batteries using periodic open circuit voltage measurements and predetermined calibration curves relating the measured voltage to residual charge on the battery. Each set of test load, test load time, and recovery time parameters define a different calibration curve for a given ambient temperature. The battery's residual capacity is displayed by a set of LED's.
- Bates U.S. Patent No. 5,162,741 discloses a battery energy monitor that measures the current delivered by the battery and estimates the remaining battery energy using a temperature compensation factor to adjust for battery capacity variations with temperature. Remaining battery life is shown on a visual display.
- This invention is a method and apparatus for detecting a specific point on a battery's capacity curve with a high degree of accuracy.
- the invention is a battery monitor and battery capacity indicator that uses a sense cell in addition to the main battery to determine main battery remaining capacity and depletion condition.
- a parameter of the sense cell is related to the main battery capacity so that the main battery will have a minimum capacity remaining when the sense cell parameter reaches a particular value or crosses a particular threshold.
- the sense cell is a battery which is identical and of the same manufacturing lot as the battery cell or cells in the main battery pack.
- a current is drawn from the sense cell that is larger than the current being drawn from the main battery.
- the main battery will have a remaining capacity whose magnitude depends on the relationship between the main battery current and the sense cell current. This information may be provided to the user by an output such as a visual display.
- FIG. 1 is a block diagram of a battery monitor and low battery indicator according to this invention.
- Figure 2 is a schematic diagram showing the preferred embodiment of this invention.
- Figure 3 is a schematic diagram showing a preferred variable resistance for use in the preferred embodiment.
- Figure 4 is a schematic diagram showing an alternative embodiment of this invention.
- This invention is a battery monitor that can indicate a low main battery condition of a battery operated device without monitoring discharge time, ambient temperature or main battery voltage and resistance parameters.
- a block diagram of the invention is shown in Figure 1.
- a current determiner 13 determines the current I LOAD flowing through the main battery or battery pack 10 to a load 11.
- Current determiner 13 may be a current sensor that directly measures I L0AD or it may be some other means that sets, indirectly measures or estimates the current.
- a voltage meter placed across a shunt in series with main battery 10 and load 11 can be used to indirectly measure the current flowing to load 11.
- a microcontroller can be used to estimate the value of I L0AD based on known characteristics of the system and/or other parameters such as voltage, elapsed time, etc.
- Sense cell 12 is preferably a battery (or a battery pack) .
- An electrical characteristic of the sense cell (such as voltage or resistance) is determined by a sensor 14 in order to provide an indication of the remaining charge level in the main battery 10.
- An output 16 such as a visual display or audible alarm provides information regarding the remaining capacity of main battery 10 and/or a warning of a low battery condition.
- a preferred embodiment of this invention is shown schematically in Figure 2.
- the main battery 10 is shown as a series connection of individual cells 20 which are each preferably lithium batteries of the same size, type and capacity. It should be understood, however, that the invention is not limited to lithium batteries or to a plurality of cells connected in series.
- the main battery and the low battery condition indicator are part of a battery operated device.
- a sense cell 22 is connected in series to the main battery 10.
- sense cell 22 is identical in type and manufacturing lot to the cell or cells 20 making up main battery 10.
- the battery pack ideally consists of the sense cell plus the main battery cells all packaged in close proximity, so that all cells are exposed to the same environmental conditions.
- the outputs of main battery 10 and sense cell 22 combine to provide power to a system load of the battery operated device, shown schematically here as element 24.
- the system load 24 is modeled as two parallel components: a component 25 that draws a current I SET set by controller 28 and a component 27 whose current draw I EST is estimated by controller 28 based on known characteristics of system load 24.
- the current I L0AD delivered by main battery 10 is therefore the sum of I SET and I EST .
- sense cell 22 is connected in series with main battery 10, a current at least equal to J i0AD is also being drawn from sense cell 22.
- sense cell 22 is identical in type and manufacturing lot to the cells 20 in main battery 10, the degradation of sense cell 22 and main cells 20 due to time and temperature will be identical.
- an incremental current kI L0AD is also drawn from sense cell 22, where k is an arbitrary constant.
- controller 28 outputs a low battery condition signal to output 16 to indicate that the charge on main battery 10 is nearly depleted.
- a variable resistance 30 between sense cell 22 and ground is set by controller 28 to a value equal to the sense cell voltage V SENSE determined by monitor 32 divided by the value of kI L0AD .
- the constant k can be chosen to provide for a certain amount of remaining capacity in the main battery after a drop in sense cell voltage below the threshold indicates that the sense cell has been depleted.
- the low battery indicator parameters for a battery operated computer may be selected to permit certain operations (such as closing a file) to be performed after the system output indicates a low battery condition.
- the parameters for a battery operated defibrillator may be selected such that the device can deliver at least one more shock to a patient after a low battery condition is indicated.
- a diode 34 permits the main battery 10 to continue to be used after sense cell 22 has been depleted.
- FIG. 3 shows a preferred embodiment of variable resistance 30.
- a capacitor 36 is placed in parallel with the series combination of a resistor 37 and a switch 38 controlled from a controller via line 31.
- Switch 38 can be repetitively turned on and off; the amount of incremental current drawn from sense cell 22 over time depends upon the values of the capacitor and the resistor as well as the amount of time switch 38 is on. The current flow can therefore be adjusted by changing the duty cycle of switch 38.
- main battery 10 is shown as a series connection of individual cells 20 which are each preferably lithium batteries. It should be understood, however, that the invention is not limited to lithium batteries or to a plurality of cells connected in series. Again, the main battery and the low battery condition indicator are part of a battery operated device.
- Sense cell 40 is preferably a battery whose remaining useful life can be predicted by measuring one or more of the battery's electrical characteristics.
- sense cell 40 could be an alkaline battery which exhibits a measurable voltage drop as its capacity is depleted.
- a controller 28 monitors the current I L0AD delivered by main battery 10 to system load 24 via sensor 26 and draws a proportional current kI L0AD from sense cell 40 in the same manner as in the Figure 2 embodiment.
- the value of k and the initial voltage and charge capacity of sense cell 40 may be calibrated with the initial capacity of battery 10 so that the depletion state of sense cell 40 can be used to estimate the remaining charge in battery 10.
- the voltage or other electrical characteristic of sense cell 40 is monitored by the controller via monitor 32.
- the controller When the sensed electrical characteristic crosses a threshold determined by the calibration between sense cell 40 and main battery 10, the controller outputs a low battery condition signal to output 16 to indicate that the charge on main battery 10 is nearly depleted.
- the controller and output 16 can indicate constantly or on demand the remaining charge in main battery 10 at any point from full charge to depletion.
- the sense cell could be a rechargeable battery starting from a depleted condition when the main battery is fully charged. In this way, when the main battery has been depleted, there will be additional capacity in the sense cell to provide further power to the battery operated device after exhaustion of the main battery.
- the sense cell may be some other chemical, electrochemical or electrical device having a parameter that can be related to the remaining capacity of the main battery.
- the sense cell may be a chemical cell whose reaction rate can be controlled by the amount of current or heat applied to it.
- the chemical cell may be provided with a color change mechanism to indicate when a particular threshold has been reached.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69533254T DE69533254T2 (en) | 1994-01-14 | 1995-01-10 | BATTERY CAPACITY INDICATOR |
CA002180475A CA2180475C (en) | 1994-01-14 | 1995-01-10 | Battery capacity indicator |
JP7519092A JPH09511609A (en) | 1994-01-14 | 1995-01-10 | Battery capacity display |
EP95908026A EP0739482B1 (en) | 1994-01-14 | 1995-01-10 | Battery capacity indicator |
AU16017/95A AU691567B2 (en) | 1994-01-14 | 1995-01-10 | Battery capacity indicator |
NO962928A NO962928D0 (en) | 1994-01-14 | 1996-07-12 | Battery capacity indicator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/182,605 US5483165A (en) | 1994-01-14 | 1994-01-14 | Battery system and method for determining a battery condition |
US08/182,605 | 1994-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995019564A1 true WO1995019564A1 (en) | 1995-07-20 |
Family
ID=22669206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/000368 WO1995019564A1 (en) | 1994-01-14 | 1995-01-10 | Battery capacity indicator |
Country Status (8)
Country | Link |
---|---|
US (1) | US5483165A (en) |
EP (1) | EP0739482B1 (en) |
JP (1) | JPH09511609A (en) |
AU (1) | AU691567B2 (en) |
CA (1) | CA2180475C (en) |
DE (1) | DE69533254T2 (en) |
NO (1) | NO962928D0 (en) |
WO (1) | WO1995019564A1 (en) |
Cited By (1)
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KR20210132315A (en) * | 2020-04-27 | 2021-11-04 | 현대자동차주식회사 | Apparatus and mehthod for controlling battery of vehicle |
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US4590943A (en) * | 1985-04-19 | 1986-05-27 | Physio-Control Corporation | System for providing power to portable defibrillator |
US4693119A (en) * | 1986-01-17 | 1987-09-15 | The United States Of America As Represented By The Secretary Of The Navy | Lithium battery energy monitor |
JPH0368879A (en) * | 1989-08-08 | 1991-03-25 | Sharp Corp | Electronic machinery |
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US5162741A (en) * | 1991-04-03 | 1992-11-10 | The United States Of America As Represented By The Secretary Of The Navy | Temperature compensated lithium battery energy monitor |
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- 1995-01-10 DE DE69533254T patent/DE69533254T2/en not_active Expired - Fee Related
- 1995-01-10 WO PCT/US1995/000368 patent/WO1995019564A1/en active IP Right Grant
- 1995-01-10 AU AU16017/95A patent/AU691567B2/en not_active Ceased
- 1995-01-10 CA CA002180475A patent/CA2180475C/en not_active Expired - Fee Related
- 1995-01-10 EP EP95908026A patent/EP0739482B1/en not_active Expired - Lifetime
- 1995-01-10 JP JP7519092A patent/JPH09511609A/en not_active Ceased
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1996
- 1996-07-12 NO NO962928A patent/NO962928D0/en unknown
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US4207514A (en) * | 1977-11-21 | 1980-06-10 | Energy Research Corporation | System and apparatus for monitoring or controlling secondary battery operation |
US5250905A (en) * | 1991-09-24 | 1993-10-05 | Duracell Inc. | Battery with electrochemical tester |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150142351A1 (en) * | 2013-11-20 | 2015-05-21 | Honeywell International Inc. | System and Method of Battery Life Estimation |
EP2884296A3 (en) * | 2013-11-20 | 2015-10-21 | Life Safety Distribution AG | System and method of battery life estimation |
AU2014253513B2 (en) * | 2013-11-20 | 2016-04-21 | Life Safety Distribution Ag | System and method of battery life estimation |
US9658290B2 (en) | 2013-11-20 | 2017-05-23 | Life Safety Distribution Ag | System and method of battery life estimation |
Also Published As
Publication number | Publication date |
---|---|
EP0739482A4 (en) | 1997-05-02 |
EP0739482B1 (en) | 2004-07-14 |
AU691567B2 (en) | 1998-05-21 |
US5483165A (en) | 1996-01-09 |
DE69533254T2 (en) | 2005-08-25 |
NO962928L (en) | 1996-07-12 |
AU1601795A (en) | 1995-08-01 |
EP0739482A1 (en) | 1996-10-30 |
CA2180475C (en) | 2002-12-17 |
DE69533254D1 (en) | 2004-08-19 |
CA2180475A1 (en) | 1995-07-20 |
NO962928D0 (en) | 1996-07-12 |
JPH09511609A (en) | 1997-11-18 |
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