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Expanded battery capacity identification scheme and apparatus

  • US 5,184,059 A
  • Filed: 09/16/1991
  • Issued: 02/02/1993
  • Est. Priority Date: 09/16/1991
  • Status: Expired due to Fees
First Claim
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1. A battery charging system including a charging path for charging batteries, the system comprising:

  • a charging algorithm sensing circuit;

    at least one battery cell having a positive terminal, a negative terminal, and a predetermined charging algorithm;

    resistance means for providing a resistance value, the resistance means comprising two terminals, the resistance value related to the predetermined charging algorithm of the cell;

    an identification capacitor having a stabilizing time coupled with the resistance means and coupled to one of the terminals of the battery cell to form a time constant related to the predetermined charging algorithm; and

    ;

    the charging algorithm sensing circuit further comprising;

    means for providing an electrical current in the resistance means after the time constant;

    means for periodically measuring the voltage developed across the resistance means until the voltage has stabilized, after the stabilizing time;

    means for measuring the stabilizing time; and

    means for converting the measured stabilizing time to a predetermined identifiable battery usage.

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