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System and method for sensing battery capacity

  • US 10,871,520 B2
  • Filed: 01/02/2019
  • Issued: 12/22/2020
  • Est. Priority Date: 12/06/2010
  • Status: Active Grant
First Claim
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1. A battery sense device comprising:

  • a temperature sensor adapted to measure a temperature of a battery;

    a controller adapted to be coupled to the battery, the controller configured to;

    measure a first voltage of the battery during a first interval;

    estimate a first current through the battery during the first interval using the first voltage, a first depth of discharge (DOD), and a first resistance of the battery, wherein the estimate of the first current is made without measuring current;

    calculate an estimated second DOD of the battery, during a second interval after the first interval, based on the first current;

    measure a second voltage of the battery during the second interval; and

    estimate a second current through the battery during the second interval based on the second voltage of the battery.

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