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Rapid determination of present and potential battery capacity

  • US 6,307,379 B2
  • Filed: 03/02/2001
  • Issued: 10/23/2001
  • Est. Priority Date: 02/02/1999
  • Status: Expired due to Fees
First Claim
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1. A method for determining a charge parameter of a battery, comprising:

  • applying a rest period to said battery;

    applying a discharge pulse to said battery;

    measuring a first loaded circuit voltage of said battery at a first point during said discharge pulse;

    measuring a second loaded circuit voltage of said battery at a second point during said discharge pulse;

    determining a difference voltage by subtracting said second loaded circuit voltage from said first loaded circuit voltage;

    using said difference voltage to determine at least one of the following charge parameters;

    the present charge capacity of said battery, an operating curve for said battery, and an operating point of an operating curve of said battery; and

    outputting said charge parameter.

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