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Method to determine remaining capacity of a rechargeable battery

  • US 5,949,217 A
  • Filed: 01/29/1998
  • Issued: 09/07/1999
  • Est. Priority Date: 01/30/1997
  • Status: Expired due to Term
First Claim
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1. A method to determine remaining capacity of a rechargeable battery, comprising:

  • (1) a step to integrate rechargeable battery discharge current;

    (2) a step to subtract the integrated discharge current from the charge capacity of the rechargeable battery to compute remaining battery capacity;

    (3) a step to measure rechargeable battery voltage;

    (4) a step to correct respective computed remaining battery capacity values when battery voltage reaches a first voltage and a lower second voltage, with a previously established first remaining battery capacity and a second remaining battery capacity corresponding to those voltages;

    (5) a step to compare the difference between the computed remaining battery capacity values at the point the first voltage is reached and at the point the second voltage is reached, with the difference between said first remaining battery capacity and said second remaining battery capacity; and

    (6) a step to modify the first voltage to make the two said differences equal.

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