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Method for charging a secondary battery and charger used therefor using constant current and constant voltage

  • US 5,637,981 A
  • Filed: 07/09/1996
  • Issued: 06/10/1997
  • Est. Priority Date: 05/14/1993
  • Status: Expired due to Term
First Claim
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1. A method for charging a secondary battery comprising the steps of:

  • charging said secondary battery with a constant current;

    continuing a charging operation with said constant current for a predetermined period of time from the time when a charging voltage across said secondary battery reaches a predetermined value and switching said charging operation with said constant current to a charging operation with a constant voltage; and

    stopping said charging operation with said constant voltage when a charging current reaches a predetermined value, wherein said step of continuing the charging operation with said constant current is repeated when said charging current flowing through said secondary battery during the charging operation with said constant voltage is less than said predetermined value.

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