Method and apparatus for electronically evaluating the internal temperature of an electrochemical cell or battery
First Claim
1. Apparatus for determining the internal temperature of an electrochemical cell or battery comprising:
- electrical excitation circuitry adapted to apply time-varying electrical excitation to said cell or battery;
response sensing circuitry configured to sense time-varying electrical response of said cell or battery generated as a result of said time-varying electrical excitation; and
computation circuitry responsive to said time-varying excitation and to said time-varying response and adapted to calculate the time constant of a particular parallel G-C subcircuit comprising part of an electrical circuit representation of said cell or battery, said time constant characterized by varying inversely with internal temperature, said computation circuitry further adapted to evaluate said internal temperature from the computed value of said time constant.
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Abstract
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 either 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.
313 Citations
11 Claims
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1. Apparatus for determining the internal temperature of an electrochemical cell or battery comprising:
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electrical excitation circuitry adapted to apply time-varying electrical excitation to said cell or battery; response sensing circuitry configured to sense time-varying electrical response of said cell or battery generated as a result of said time-varying electrical excitation; and computation circuitry responsive to said time-varying excitation and to said time-varying response and adapted to calculate the time constant of a particular parallel G-C subcircuit comprising part of an electrical circuit representation of said cell or battery, said time constant characterized by varying inversely with internal temperature, said computation circuitry further adapted to evaluate said internal temperature from the computed value of said time constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for electronically evaluating the internal temperature an electrochemical cell or battery comprising:
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applying time-varying electrical excitation to said cell or battery; sensing time-varying electrical response to said electrical excitation; evaluating the time constant of a particular parallel G-C subcircuit of an equivalent circuit representation of said cell or battery from said time-varying electrical excitation and said time-varying electrical response; and evaluating said internal temperature from the value of said time constant. - View Dependent Claims (10, 11)
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Specification