Method and apparatus for detecting a bad cell in a storage battery

  • US 5,757,192 A
  • Filed: 05/20/1996
  • Issued: 05/26/1998
  • Est. Priority Date: 05/20/1996
  • Status: Expired due to Term
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First Claim
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1. An apparatus for detecting a bad cell in a storage battery having a plurality of cells, comprising:

  • input circuitry for electrically coupling to first and second terminals of the storage battery;

    voltage measuring circuitry coupled to the input circuitry providing voltage output related to a voltage potential between the first and second terminals of the storage battery;

    conductance measuring circuitry coupled to the input circuitry providing a conductance output related to conductance of the storage battery measured between the first and second terminalsvoltage comparison circuitry comparing the voltage output to a voltage reference and providing a discharged output if the voltage output is less than the voltage reference;

    conductance comparison circuitry comparing the conductance output to a conductance reference and providing a high conductance output if the conductance output is greater than the conductance reference; and

    output circuitry providing a bad cell output in response to detection of a discharged output and a high conductance output, the bad cell output indicative of a bad cell among the plurality of cells in the storage battery.

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