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System and method for estimating a state vector associated with a battery

  • US 20070046292A1
  • Filed: 08/23/2005
  • Published: 03/01/2007
  • Est. Priority Date: 08/23/2005
  • Status: Active Grant
First Claim
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1. A method for estimating a state vector associated with a battery, the method comprising:

  • determining a time interval that the battery has been electrically decoupled from a load circuit, the time interval starting at a first time;

    obtaining a first state vector associated with the battery from a memory, the first state vector being determined prior to the first time;

    calculating a second predicted state vector associated with the battery based on the first state vector and the time interval;

    measuring a battery voltage output by the battery to obtain a first battery voltage value after the first time interval when the battery is electrically re-coupled to the load circuit;

    estimating a second battery voltage value associated with the battery based on the second predicted state vector;

    calculating a voltage error value based on the first battery voltage value and the second battery voltage value; and

    calculating a third estimated state vector associated with the battery based on the second predicted state vector and the voltage error value.

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