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

  • US 6,495,990 B2
  • Filed: 08/27/2001
  • Issued: 12/17/2002
  • Est. Priority Date: 09/01/1999
  • Status: Expired due to Term
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First Claim
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1. Apparatus for determining state-of-charge of an electrochemical cell or battery comprising:

  • response sensing circuitry coupled to said cell or battery and adapted to sense time-varying electrical response of said cell or battery generated as a result of time-varying electrical excitation of said cell or battery; and

    , computation circuitry coupled to said response sensing circuitry and adapted to evaluate the real part of the complex admittance of a particular parallel G-C subcircuit comprising part of an electrical circuit representation of said cell or battery, 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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