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Lithium-ion battery safety monitoring

  • US 10,302,703 B2
  • Filed: 07/06/2016
  • Issued: 05/28/2019
  • Est. Priority Date: 07/08/2015
  • Status: Active Grant
First Claim
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1. A method for monitoring the safety of a rechargeable Li-ion battery (LIB), the method comprising the procedures of:

  • measuring, using a response measurement device, a cell operating parameter of said LIB;

    determining an initial electrical state of said LIB based on the cell operating parameter;

    altering the electrical state of said LIB by the application or removal of a direct current (DC) electrical stimulus to said LIB, using a stimulus application device, so as to trigger a time-varying response;

    measuring, using the response measurement device, the time-varying response of said LIB to the altered electrical state;

    extracting at least one primary response parameter associated with at least the functional form of the measured response;

    deriving at least one secondary response parameter from said primary response parameter;

    determining a likelihood of a short circuit precursor condition, in accordance with at least one of;

    said primary response parameter; and

    said secondary response parameter, wherein said primary response parameter includes at least one ofvoltage response values at different times,current response values at different times, andparameters relating to the electrical state altering; and

    providing an alert of a potential short circuit derived hazard, in accordance with the determined likelihood of a short circuit precursor condition.

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