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Battery charging device method for charging battery pack and battery pack

  • US 5,872,444 A
  • Filed: 03/28/1997
  • Issued: 02/16/1999
  • Est. Priority Date: 04/05/1996
  • Status: Expired due to Term
First Claim
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1. A battery charging device for charging a battery pack having a battery cell, said battery pack being capable of storing information indicative of a maximum charging current and a maximum charging voltage of the battery cell and being capable of communicating said information, said battery charging device comprising:

  • communication means for receiving said information indicative of the maximum charging current and the maximum charging voltage of the battery cell transmitted from said battery pack;

    a variable voltage source for supplying an output voltage;

    a variable current source for supplying an output current; and

    control means for controlling said variable voltage source and variable current source to supply said output current and voltage upon charging of said battery pack so as not to exceed said maximum charging current and said maximum charging voltage, said variable current source supplying the maximum current prior to said battery pack reaching a predetermined voltage which is less than said maximum charging voltage and said variable voltage source supplying said maximum charging voltage after said battery pack has reached said predetermined voltage.

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