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Estimation of State-Of-Health in Batteries

  • US 20110060538A1
  • Filed: 09/07/2010
  • Published: 03/10/2011
  • Est. Priority Date: 09/04/2009
  • Status: Active Grant
First Claim
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1. A method for online estimation of a state-of-health in a chemical battery, the method comprising:

  • determining if a terminal voltage of the chemical battery differs from a calculated terminal voltage;

    in response to determining that the terminal voltage of the chemical battery differs from the calculated terminal voltage, calculating a range of voltages by taking the convolution of a terminal current of the chemical battery with a range of impulse responses from a look up table of impulse responses corresponding to different states-of-health;

    comparing the terminal voltage of the chemical battery with the range of calculated voltages to determine a second impulse response that corresponds to the case where the terminal voltage matches the calculated voltage; and

    using the look up table of impulse responses corresponding to different states-of-health to determine the state-of-health of the chemical battery from the second impulse response.

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