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State based full and empty control for rechargeable batteries

  • US 10,139,452 B2
  • Filed: 10/16/2017
  • Issued: 11/27/2018
  • Est. Priority Date: 12/07/2010
  • Status: Active Grant
First Claim
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1. A method of determining an empty state of a rechargeable battery comprising:

  • predicting an open circuit voltage of the battery, even in the presence of a variable load on the battery;

    predetermining an open circuit voltage at which the battery is to be considered fully discharged that is independent of the variable load on the battery;

    in the presence of varying loads on the battery, allowing the battery to discharge to a terminal voltage below the open circuit voltage at which the battery will be considered discharged until the open circuit voltage prediction reaches the open circuit voltage at which the battery is to be considered fully discharged;

    terminating the discharging when the predicted open circuit voltage of the battery reaches the open circuit voltage at which the battery is to be considered fully discharged.

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