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Method and apparatus for measuring battery capacity using voltage response signal based on pulse current

  • US 6,118,275 A
  • Filed: 12/18/1998
  • Issued: 09/12/2000
  • Est. Priority Date: 06/25/1998
  • Status: Expired due to Term
First Claim
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1. A method of measuring battery capacity using a voltage response signal based on a pulse current, comprising the steps of:

  • measuring a voltage signal based on a pulse current signal applied to at least one end of a battery as a function of time;

    analyzing the measured voltage signal to determine parameters, wherein the parameters are model parameters determined from an approximation of the measured voltage signal to an impedance function obtained from an equivalent circuit comprising resistances and model parameters of a condenser;

    examining a correlation between the parameters and the capacity of the battery measured by a real-time discharge method; and

    based on the correlation, determining the unknown capacity of the battery from a voltage characteristic in response to the pulse current applied to the battery.

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