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Method and apparatus for determining when to terminate charging of a battery

  • US 6,097,172 A
  • Filed: 08/15/1996
  • Issued: 08/01/2000
  • Est. Priority Date: 08/15/1996
  • Status: Expired due to Fees
First Claim
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1. A method for charging a battery comprising the steps of:

  • generating repetitive charging cycles having charging and multiple depolarization pulses and including at least two rest periods during which there is neither a charge nor a discharge current;

    measuring the open circuit voltage of the battery during at least an extended second or later rest period of charge cycles separated in time;

    comparing measured open circuit voltages; and

    terminating the charging cycles when the comparison step yields a negative change in the open circuit voltage in excess of a predetermined amount.

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