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Method and apparatus for determining the state-of-charge of a battery

  • US 9,885,757 B2
  • Filed: 03/28/2012
  • Issued: 02/06/2018
  • Est. Priority Date: 04/01/2011
  • Status: Active Grant
First Claim
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1. A method of determination of the state-of-charge of a battery, the method comprising:

  • detecting that the battery is in a rest state, wherein the battery comprises one or more battery cells, battery blocks or battery packs;

    coupling a pre-conditioning logic to the battery;

    drawing a pre-conditioning current from the battery using the pre-conditioning logic, sufficient to reduce charge of the battery by a charge reduction threshold value that is predetermined to reduce an open circuit voltage to state-of-charge determination error, in response to detecting that the battery is in the rest state to affect a correlation between the state-of-charge of the battery and an open-circuit voltage of the battery;

    measuring the open-circuit voltage of the battery after drawing the pre-conditioning current; and

    determining the state-of-charge of the battery based on the open-circuit voltage of the batterywherein the determining is subsequent to the completion of a partial discharge of the battery in the rest state.

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