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Apparatus for measuring remaining capacity of a battery

  • US 5,798,646 A
  • Filed: 08/30/1996
  • Issued: 08/25/1998
  • Est. Priority Date: 09/01/1995
  • Status: Expired due to Term
First Claim
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1. A battery remaining capacity measuring apparatus comprising:

  • first means for collecting values of a plurality of voltages of a battery and values of a plurality of currents passing through a load during a first time period occurring before a start of continuous running of said load;

    second means coupled to said first means for obtaining a line corresponding to said values of said plurality of voltages and said values of said plurality of currents, said line showing a relationship between voltage and current from a plurality of points within a range from a first point near where voltage begins to decrease sharply during said first time period to a second point near a minimum voltage occurring during said first time period;

    third means coupled to said second means for finding an initial remaining capacity voltage at which a reference current value intersects said line; and

    fourth means coupled to said third means for displaying said initial remaining capacity voltage.

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