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Method and apparatus for measuring the state of charge of a battery by monitoring reductions in voltage

  • US 4,193,026 A
  • Filed: 08/25/1978
  • Issued: 03/11/1980
  • Est. Priority Date: 04/18/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for monitoring the condition of a battery during its discharge from a charged condition comprising:

  • means for monitoring the output terminal voltage of the battery and producing an intermediate output signal for at least some instances when the magnitude of the terminal voltage falls below a threshold value during said discharge;

    means for integrating said intermediate output signal over a plurality of reductions in the magnitude of the terminal voltage which produce an intermediate output signal; and

    means for producing a first output signal related to the integral formed by said integrating means.

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