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Capacity measurement system for a battery with open circuit voltage detection

  • US 7,557,540 B2
  • Filed: 06/15/2006
  • Issued: 07/07/2009
  • Est. Priority Date: 01/23/2006
  • Status: Active Grant
First Claim
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1. A method for measuring a remaining capacity of a battery, comprising the steps of:

  • measuring an open circuit voltage;

    initializing an accumulation counter with an initial capacity;

    calibrating the accumulation counter with a calibrating capacity;

    obtaining the initial capacity and the calibrating capacity of the battery based on the open circuit voltage;

    setting a first flag indicating that a host device initializes the accumulation counter;

    adjusting the accumulation counter according to a discharging or charging process of the battery; and

    obtaining the remaining capacity of the battery based on the accumulation counter.

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