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Method of determining the energy capacity of a battery

  • US 7,800,344 B2
  • Filed: 02/20/2007
  • Issued: 09/21/2010
  • Est. Priority Date: 02/20/2007
  • Status: Active Grant
First Claim
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1. A method of determining the available energy of a battery comprising:

  • measuring a first open circuit voltage of said battery to correlate to and determine a first state of charge;

    changing a level of energy available in said battery by a measured amount;

    measuring a second open circuit voltage of said battery after changing the level of energy to determine a second state of charge; and

    dividing the measured amount of energy change in said battery by the calculated change in the state of charge from the first state of charge to the second state of charge to determine the available energy capacity of said battery;

    wherein the step of changing the level of energy includes a discharge event, and the discharge event occurs at a current having a generally unvarying rate.

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