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Method for determining battery capacity

  • US 8,271,217 B2
  • Filed: 07/13/2011
  • Issued: 09/18/2012
  • Est. Priority Date: 11/05/2004
  • Status: Active Grant
First Claim
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1. An electrical device powered by a battery, comprising:

  • voltage reading circuitry configured to monitor the voltage of a power source connector that is charging the battery;

    transition phase determining circuitry operatively connected to the voltage reading circuitry to determine that the battery has entered a transition phase based on sensing an abrupt change in the voltage; and

    battery capacity determining circuitry configured to determine, in response to the transition phase determining circuitry determining that the battery is in the transition phase, a capacity of the battery based on a transition phase battery capacity model that defines the battery'"'"'s capacity as a function of the battery'"'"'s voltage;

    the transition phase determining circuitry being further configured to determine that the transition phase has ended based on the lapse of a predetermined time period from the start of the transition phase; and

    the transition phase battery capacity model being determined from both a non-transition battery capacity charge model and a non-transition battery capacity discharge model, all three models defining the battery'"'"'s capacity as a function of its voltage.

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