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METHOD AND SYSTEM FOR DETERMINING STATE OF CHARGE OF AN ENERGY DELIVERY DEVICE

  • US 20090326842A1
  • Filed: 06/03/2009
  • Published: 12/31/2009
  • Est. Priority Date: 06/05/2008
  • Status: Active Grant
First Claim
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1. A method of determining state of charge of an energy delivery device, comprising:

  • sampling voltage values presented by the energy delivery device during a relaxation period of the energy delivery device;

    regressing, with respect to the sampled voltage values, (i) an open circuit voltage value of the energy delivery device and (ii) an overpotential value that describes a total overpotential being relaxed, wherein the regression includes a predetermined time constant of relaxation associated with the energy delivery device; and

    ,using a predetermined profile that relates open circuit voltage of the energy delivery device to state of charge of the energy delivery device, to determine a particular state of charge corresponding to the regressed open circuit voltage value.

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