Battery performance monitor

  • US 7,928,735 B2
  • Filed: 02/19/2008
  • Issued: 04/19/2011
  • Est. Priority Date: 07/23/2007
  • Status: Active Grant
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First Claim
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1. A method for tracking the state of health and state of charge of a particular battery as it experiences numerous charge/discharge cycles over its lifetime, comprising the following steps:

  • providing an instrument to be connected to the particular battery and capable of evaluating a parameter indicative of the capability of the particular battery at intervals during charge/discharge cycles over the lifetime of the particular battery and of storing the values of said parameter, and using said instrument to perform the following steps, performed without operator intervention;

    evaluating said parameter indicative of the capability of the particular battery at intervals during charge/discharge cycles experienced by the particular battery, yielding a series of values Ca;

    tracking the series of values evaluated for Ca during a particular charge/discharge cycle experienced by the particular battery, and selecting the maximum value reached in the series of values as Ce;

    tracking the values reached by Ce over the lifetime of the particular battery and selecting the maximum value reached as Cm;

    determining the state of health of the particular battery by comparing Ce and Cm; and

    determining the state of charge of the particular battery by comparing Ca and Ce, or by comparing Ca to Cm.

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