Method and apparatus for determining the charge condition of an electrochemical cell

  • US 5,717,336 A
  • Filed: 08/25/1995
  • Issued: 02/10/1998
  • Est. Priority Date: 12/24/1992
  • Status: Expired due to Fees
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First Claim
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1. A method for determining whether an electrochemical cell is substantially fully charged, comprising the steps of:

  • a) measuring the impedance of the cell at a first low frequency;

    b) measuring the impedance of the cell at a second low frequency;

    c) determining a rate of change of impedance between said first low frequency and said second low frequency; and

    d) concluding said cell is substantially fully charged when said rate of change of impedance is greater than a pre-determined amount.

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