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DETERMINING THE STATE OF-CHARGE OF BATTERIES VIA SELECTIVE SAMPLING OF EXTRAPOLATED OPEN CIRCUIT VOLTAGE

  • US 20110316547A1
  • Filed: 06/25/2010
  • Published: 12/29/2011
  • Est. Priority Date: 06/25/2010
  • Status: Active Grant
First Claim
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1. A method of determining a state-of-charge of a battery within a system powered at least in part by the battery comprising:

  • collecting a plurality of voltage measurements during operation of the system;

    determining a time-constant of relaxation and an open-circuit voltage corresponding to the battery based, at least in part, on the voltage measurements and using a mathematical model of the battery that relates the voltage measurements to the open-circuit voltage and the time-constant of relaxation; and

    ,estimating the state-of-charge of the battery based, at least in part, on the open-circuit voltage.

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