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Device and method for battery state determination

  • US 7,561,978 B2
  • Filed: 09/17/2007
  • Issued: 07/14/2009
  • Est. Priority Date: 09/18/2006
  • Status: Active Grant
First Claim
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1. A method for determining the state of a battery using a microprocessor comprising the steps of:

  • receiving measurements representative of at least one of a battery terminal voltage and a battery terminal current from a first unit;

    using a second unit to determine at least one characteristic variable for a battery state from at least one of the measured battery terminal voltage and the measured battery current;

    using a microprocessor to statistically assess the at least one characteristic variable for the battery state by performing a statistical process check;

    defining an observation window for the at least one characteristic variable within which the at least one characteristic variable is assumed to be steady-state; and

    identifying an implausible value, which is not caused by the battery, for the at least one characteristic variable if the scatter of the at least one characteristic variable exceeds a defined scatter limit.

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