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Calculation of state of charge offset using a closed integral method

  • US 7,233,128 B2
  • Filed: 07/30/2004
  • Issued: 06/19/2007
  • Est. Priority Date: 07/30/2004
  • Status: Expired due to Fees
First Claim
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1. A method of calculating an accurate state of charge of a battery installed in an electric vehicle comprising the step of:

  • using an estimated average battery state of charge for the battery based on a long-term average open circuit battery voltage to check for accuracy of a measured state of charge based on current flowing into and out of the battery, wherein the long-term average open circuit battery voltage and a long-term average observed battery voltage are equal after a predefined minimum amount of time, Tmin has been exceeded wherein when Tmin has been exceeded, an average hysteresis and an average internal resistance each associated with the battery are negligible.

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