Battery condition monitor and monitoring method

  • US 4,678,998 A
  • Filed: 12/09/1985
  • Issued: 07/07/1987
  • Est. Priority Date: 01/25/1985
  • Status: Expired due to Fees
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First Claim
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1. A battery condition monitor for a storage battery into and out of which currents flow, said currents having components of different frequencies, comprising:

  • means for detecting a terminal voltage of the storage battery;

    first means for extracting voltage frequency components from the detected terminal voltage;

    means for detecting an amperage of the currents;

    second means for extracting amperage frequency components at the same frequencies as said voltage frequency components from the detected amperage;

    means for computing internal impedances of the storage battery at each of said frequencies from the voltage and amperage frequency components;

    means for storing predetermined relationships between the internal impedance, remaining capacity and remaining service life of the storage battery for each of said frequencies; and

    means for determining the remaining capacity and remaining service life values of the storage battery at said frequencies from the computed internal impedances and said predetermined relationships.

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