Method and apparatus for determining battery properties from complex impedance/admittance

  • US 6,222,369 B1
  • Filed: 01/26/2000
  • Issued: 04/24/2001
  • Est. Priority Date: 09/11/1998
  • Status: Expired due to Term
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First Claim
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1. Apparatus for determining an electrical, chemical, or physical property of an electrochemical cell or battery comprising:

  • measuring circuitry adapted to couple to said cell or battery and adapted to determine a real part and an imaginary part of complex immittance of said cell or battery at a measurement frequency;

    control circuitry coupled to said measuring circuitry and adapted to command said measuring circuitry to select each one of n said measurement frequencies thereby defining n said real parts, n said imaginary parts and n said measurement frequencies where n is an integer number equal to or greater than two; and

    , computation circuitry coupled to said measuring circuitry and to said control circuitry and adapted to numerically combine values of said n real parts, said n imaginary parts, and said n measurement frequencies to evaluate one or more elements of a 2n-element equivalent circuit model and further adapted to determine said electrical, chemical, or physical property from one or more values of said elements.

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