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Method and system for monitoring state of lead acid battery

  • US 6,838,883 B2
  • Filed: 11/05/2002
  • Issued: 01/04/2005
  • Est. Priority Date: 11/05/2002
  • Status: Active Grant
First Claim
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1. A method of monitoring a state of a battery, comprising:

  • determining a threshold value of an internal impedance of the battery;

    preparing an expression indicating a correlation between a residual capacity of the battery and an internal impedance of the battery when the internal impedance is greater than the threshold value;

    measuring the internal impedance of the battery;

    determining an initial value of the residual capacity of the battery when the measured internal impedance is less than or equal to the threshold value; and

    monitoring a value of the residual capacity with the expression when the measured internal impedance is greater than the threshold value.

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