Model-based battery fuel gauges and methods

  • US 8,198,863 B1
  • Filed: 10/22/2007
  • Issued: 06/12/2012
  • Est. Priority Date: 12/13/2006
  • Status: Active Grant
First Claim
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1. A method of monitoring the state of charge of a battery, including when delivering current to a load on the battery, comprising:

  • modeling at least one time constant of the battery over a range of state of charge of the battery to establish a battery model;

    monitoring the battery terminal voltage;

    without using a measured value of current, estimating an open circuit voltage of the battery using the battery model and the battery terminal voltage, including when delivering current to a load on the battery; and

    ,without using a measured value of current, estimating the state of charge of the battery based on the estimated open circuit voltage of the battery and the battery model.

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