METHOD AND APPARATUS FOR DETECTING CELL DETERIORATION IN AN ELECTROCHEMICAL CELL OR BATTERY

  • US 20110208451A1
  • Filed: 02/25/2010
  • Published: 08/25/2011
  • Est. Priority Date: 02/25/2010
  • Status: Active Grant
First Claim
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1. Apparatus for determining a physical property of an electrochemical cell or battery comprising:

  • measuring circuitry adapted to apply time-varying electrical excitation to said cell or battery, to sense time-varying electrical response to said excitation, and to utilize said excitation and said response to determine components of complex immittance at n+m discrete frequencies, where n is an integer equal to or greater than two and m is an integer equal to or greater than one;

    computation circuitry responsive to said complex immittance components and adapted to evaluate the elements of a 2n-element equivalent circuit model from said complex immittance components at said n discrete frequencies, adapted to calculate the complex immittance components of said model at said m discrete frequencies, and adapted to mathematically compare said calculated components with said measured immittance components at said m discrete frequencies, the results of said comparison being related to said physical property.

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