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Fully-charged battery capacity detection method

  • US 20080255783A1
  • Filed: 04/08/2008
  • Published: 10/16/2008
  • Est. Priority Date: 04/10/2007
  • Status: Active Grant
First Claim
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1. A fully-charged battery capacity detection method comprising:

  • a no-load voltage detection step that detects first and second no-load voltages (VOCV1, VOCV2) of a battery at first no-load timing and second no-load timing in that the battery is brought in a no-load state, respectively;

    a remaining capacity determination step that determines whether the first no-load voltage (VOCV1) that is detected in the no-load voltage detection step falls within a predetermined voltage range, and determines first and second remaining capacities (SOC1 [%], SOC2 [%]) of the battery based on the first and second no-load voltages (VOCV1, VOCV2), respectively, if the first no-load voltage (VOCV1) falls within the predetermined voltage range;

    a remaining capacity variation rate calculation step that calculates a remaining capacity variation rate (δ

    S [%]) based on the difference between the first and second remaining capacities (SOC1 [%], SOC2 [%]) that are determined in the remaining capacity determination step;

    a capacity variation detection step that calculates a capacity variation value (δ

    Ah) of the battery based on the integrated value of charging and discharging currents of the battery to be charged/discharged from the first no-load timing to the second no-load timing; and

    a fully-charged capacity calculation step that calculates a fully-charged capacity (Ahf) of the battery based on the remaining capacity variation rate (δ

    S [%]) and the capacity variation value (δ

    Ah) by the following formula
    Ahf=δ

    Ah
    /(δ

    S/100)

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