Method and apparatus for evaluating stored charge in an electrochemical cell or battery

  • US 6,313,607 B1
  • Filed: 09/01/1999
  • Issued: 11/06/2001
  • Est. Priority Date: 09/01/1999
  • Status: Expired due to Fees
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First Claim
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1. Apparatus for determining state-of-charge 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 value of the real part of the complex admittance of a particular parallel subcircuit comprising part of an electrical circuit representation of said cell or battery, said real part characterized by varying with state-of-charge and reaching maximum value at approximately 50% state-of-charge, said computation circuitry further adapted to evaluate said state-of-charge from the computed value of said real part of said complex admittance.

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