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Secondary battery charging method and apparatus which controls protecting voltage level of battery protecting circuit

  • US 5,654,622 A
  • Filed: 02/06/1996
  • Issued: 08/05/1997
  • Est. Priority Date: 02/16/1995
  • Status: Expired due to Fees
First Claim
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1. A method for charging a secondary battery provided with a protecting circuit which interrupts charging of the secondary battery when the battery voltage of the secondary battery reaches a first protecting voltage which is higher than a first voltage, the first voltage being a full charge voltage of the secondary battery, comprising:

  • a step of constant current charging the secondary battery; and

    a step of further charging the secondary battery until the battery voltage of the secondary battery becomes higher than the first protecting voltage, and then charging the secondary battery after changing the protecting voltage of the protecting circuit to a secondary protecting voltage which is higher than the first protecting voltage when the battery voltage of the secondary battery becomes higher than the first protecting voltage.

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