WO2001016614A1 - Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery - Google Patents
Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery Download PDFInfo
- Publication number
- WO2001016614A1 WO2001016614A1 PCT/US2000/024266 US0024266W WO0116614A1 WO 2001016614 A1 WO2001016614 A1 WO 2001016614A1 US 0024266 W US0024266 W US 0024266W WO 0116614 A1 WO0116614 A1 WO 0116614A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery
- time
- internal temperature
- cell
- varying
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00038—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors
- H02J7/00041—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors in response to measured battery parameters, e.g. voltage, current or temperature profile
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to testing of storage batteries. More specifically, the invention relates to measuring temperature of an electrochemical cell or battery.
- Patent 4,423,378 refer to a battery temperature "probe" whose output is inputted to a microprocessor for the purpose of correcting load-test results. Similar temperature probes are described by Alber et al . in U.S. Patent 4,707,795. Other workers have attached thermistors to test clips so that they would be in thermal contact with a battery terminal, or have placed them in thermal contact with the battery's case. Even infrared techniques have been used to determine battery case temperature .
- a testing device applies time-varying electrical excitation to a cell or battery and senses the resulting time-varying electrical response.
- Computation circuitry within the device uses voltage and current signals derived from the excitation and response signals as inputs and computes values of elements of an equivalent circuit representation of the cell or battery.
- the internal temperature of the cell or battery is calculated from the value of the time constant of a particular parallel G-C subcircuit of the equivalent circuit.
- the battery's internal temperature is then displayed to the user, used to apply appropriate temperature corrections to other computed quantities, used to detect thermal runaway, and/or used to control an external process such as charging of the battery.
- FIG. 1 is a block diagram of a device for measuring the internal temperature of an electrochemical cell or battery according to the present invention.
- FIG. 2 depicts a six-element small signal equivalent circuit representation of a particular automotive storage battery.
- FIG. 3 is a plot of the variation of the three subcircuit time-constants defined in FIG. 2 as functions of the charge removed from the battery.
- FIG. 4 is a plot of measured and theoretical values of time constant ⁇ 3 defined in FIG. 2 as functions of the internal temperature of the battery.
- FIG. 5 is a plot of the inverse of the relationship plotted in FIG. 4.
- FIG. 6 is a circuit representation of the parallel G3-C3 subcircuit showing its admittance Y3.
- DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Clearly, a method and apparatus for electronically determining the true internal temperature of a cell/battery would be of great value. The present invention addresses this need. It is based upon teachings disclosed in pending A very important application of the method taught herein is in the detection of "thermal runaway" - a phenomenon in which the internal temperature of a battery undergoing charging rises catastrophically (see, e.g., McShane et al . , U.S. Patent 5,574,355).
- FIG. 1 discloses a block diagram of apparatus for evaluating a battery's internal temperature according to the present invention. Apparatus of this type is fully disclosed in pending U.S. Patent Application Ser. No. 09/152,219, filed September 11, 1998 and entitled "METHOD AND APPARATUS FOR MEASURING COMPLEX IMPEDANCE OF CELLS AND BATTERIES" and pending U.S.
- Measuring circuitry 10 electrically couples to cell/battery 20 by means of current-carrying contacts A and B and voltage-sensing contacts C and D. Measuring circuitry 10 passes a periodic time-varying current i(t) through contacts A and B and senses a periodic time-varying voltage v(t) across contacts C and D.
- measuring circuitry 10 determines real and imaginary parts of a complex parameter, either impedance Z or admittance Y, at a measuring frequency f k ; where f k is a discrete frequency contained in the periodic waveforms of both i(t) and v(t) .
- Control circuitry 30 couples to measuring circuitry 10 via command path 40 and commands measuring circuitry 10 to determine the complex parameter of cell/battery 20 at each one of n discrete measuring frequencies, where n is an integer number. This action defines 3n experimental quantities: the values of the n measuring frequencies and the values of the n imaginary parts and n real parts of the complex parameter at the n measuring frequencies .
- Computation circuitry 50 couples to measuring circuitry 10 and to control circuitry 30 via data paths 60 and 70, respectively, and accepts the 2n experimental values from measuring circuitry 10 and the values of the n measuring frequencies from control circuitry 30.
- computation circuitry 50 uses algorithms disclosed in U. S. Patent Application 09/151,324 to combine these 3n quantities numerically to evaluate 2n elements of an equivalent circuit representation of the cell/ battery.
- Computation circuitry 50 then calculates the internal temperature of the cell/battery from values of particular elements of this circuit representation.
- computation circuitry 50 outputs the computed result to the user on display 90 and/or uses the result to activate an alarm 100 or to control a process 110 such as a battery charger.
- a microprocessor or microcontroller running an appropriate software program can perform the functions of both control circuitry 30 and computation circuitry 50.
- Figure 3 is a logarithmic plot of the three time constants defined above as functions of charge (ampere-hours) removed from the battery.
- ⁇ 3 varies inversely with temperature.
- This variation is consistent with a theoretical model that associates theG3-C3 subcircuit with a linearized, small-signal, representation of the nonlinear electrochemical reaction occurring at the negative plates.
- T By empirically establishing this relationship between ⁇ 3 and T, one can actually utilize measurements of ⁇ 3 to determine the battery's internal temperature, T.
- Figure 4 shows experimental points compared with a theoretical x 3 (T c ) relationship. Note that the steepest slope, and hence the most accurate temperature determination, occurs in the most interesting region between -20° C and +20° C.
- the theoretical curve disclosed in FIG. 4 is a plot of the following equation:
- the inverse theoretical T c ( ⁇ 3 ) curve is plotted in FIG. 5.
- This important temperature information can then be used to apply accurate temperature corrections to other measured quantities, such as CCA, state-of-charge, and amp-hour capacity. It can also be used to detect a thermal runaway condition, and to control an external process such as a battery charger.
- Y3 G3 + j ⁇ C3
- G3 and C3 the two quantities
- my discussion above actually discloses a relationship existing between the real and imaginary parts of Y3 and the internal temperature of the battery.
- complex Z and complex Y are reciprocals of one another, no simple relationship exists between the real and imaginary parts of impedance Z3 and time constant ⁇ 3 . Accordingly, the results of any ac measurement must be expressed in complex admittance form - not complex impedance form - in order to observe the important relationship that I have disclosed herein. How this complex admittance is obtained, however, is relatively unimportant .
- LI is treated as a short circuit while C2 is treated as an open circuit.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001520118A JP2003508759A (en) | 1999-09-01 | 2000-09-01 | Method and apparatus for electronically assessing the internal temperature of electrochemical cells and batteries |
EP00959862A EP1212630B1 (en) | 1999-09-01 | 2000-09-01 | Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery |
DE60041585T DE60041585D1 (en) | 1999-09-01 | 2000-09-01 | METHOD AND DEVICE FOR ELECTRONIC DETERMINATION OF THE INTERNAL TEMPERATURE OF AN ELECTROCHEMICAL CELL OR BATTERY |
AU71109/00A AU7110900A (en) | 1999-09-01 | 2000-09-01 | Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/388,276 US6137269A (en) | 1999-09-01 | 1999-09-01 | Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery |
US09/388,276 | 1999-09-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001016614A1 true WO2001016614A1 (en) | 2001-03-08 |
Family
ID=23533435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/024266 WO2001016614A1 (en) | 1999-09-01 | 2000-09-01 | Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery |
Country Status (6)
Country | Link |
---|---|
US (2) | US6137269A (en) |
EP (1) | EP1212630B1 (en) |
JP (1) | JP2003508759A (en) |
AU (1) | AU7110900A (en) |
DE (1) | DE60041585D1 (en) |
WO (1) | WO2001016614A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1212630B1 (en) | 2009-02-18 |
DE60041585D1 (en) | 2009-04-02 |
EP1212630A1 (en) | 2002-06-12 |
AU7110900A (en) | 2001-03-26 |
US6137269A (en) | 2000-10-24 |
JP2003508759A (en) | 2003-03-04 |
US6294897B1 (en) | 2001-09-25 |
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