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System and method for monitoring the state of charge of a battery

  • US 8,154,252 B2
  • Filed: 03/30/2009
  • Issued: 04/10/2012
  • Est. Priority Date: 03/31/2008
  • Status: Active Grant
First Claim
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1. A process for monitoring the status of a battery, comprising the steps of:

  • measuring a battery current;

    comparing the battery current to a predetermined threshold;

    determining, from the battery current comparison, the battery status as one of charging, discharging and quiescent;

    for a battery charging status determination, computing the charging state of charge of the battery;

    for battery discharge status determination, comparing the discharge current to a plurality of predetermined thresholds, selecting, based upon the result of the discharge current comparison, a basis for the discharge current from one of a plurality of predetermined discharge conditions, and computing the discharging state of charge of the battery for the select discharge condition; and

    for quiescent status, computing the quiescent state of charge of the battery; and

    providing the computed state of charge of the battery in a quantitative form.

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