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Battery set structure and charge/discharge control apparatus for lithium-ion battery

  • US 6,064,179 A
  • Filed: 02/25/1999
  • Issued: 05/16/2000
  • Est. Priority Date: 08/09/1993
  • Status: Expired due to Fees
First Claim
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1. A charge circuit capable of simultaneously mounting a plurality of battery packs each using a lithium secondary battery cell or a battery set thereof, comprising:

  • a constant voltage/constant current power supply for applying a charge power supply voltage to the battery pack;

    a current detection circuit for detecting a charge current of the battery pack;

    a regulation circuit for controlling the charge current to a predetermined value; and

    control means for shifting a charge mode of the battery pack to a constant voltage charge mode when the charge current of the battery pack, which is supplied from the constant voltage/constant current power supply during a constant charge operation, becomes smaller than a set value, and charging remaining battery packs with a constant current within a charge current control range by the regulation circuit, thereby, before the battery pack during the charge operation is set in a full charge state, charging the remaining battery packs within the charge current control range by the regulation circuit.

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