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Method Of Estimating The State-Of-Charge And Of The Use Time Left Of A Rechageable Battery, And Apparatus For Executing Such A Method

  • US 20080150491A1
  • Filed: 02/23/2005
  • Published: 06/26/2008
  • Est. Priority Date: 02/25/2004
  • Status: Abandoned Application
First Claim
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1. A method of estimating the state-of-charge of a Li-ion battery, comprising the steps of:

  • measuring the voltage across the battery during a first measurement and converting this measured value into the state-of-charge (SoCs);

    subsequently charging the battery;

    measuring the voltage across the battery during a second measurement and converting this measured value to a measured state-of-charge value(SoCe);

    determining the accumulated charge during charging by integration of the charge current;

    subtracting the measured state of charge (SoCs) in the first measurement from the state-of-charge (SoCe) in the second measurement; and

    updating the value of the maximum capacity of the battery (Capmax) by relating the charge withdrawn from the battery with the result of the subtraction (SOCe-SOCs),characterized in that at least the second measurement is executed during charging.

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