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Charging/discharging control device and method for canceling memory effect in secondary battery

  • US 6,465,988 B2
  • Filed: 04/20/2001
  • Issued: 10/15/2002
  • Est. Priority Date: 04/28/2000
  • Status: Expired due to Fees
First Claim
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1. A charging/discharging control device, comprising:

  • a secondary battery formed of a battery assembly with a plurality of cells combined with one another;

    a memory effect determinator for determining whether a discharging memory effect has occurred, based on at least one of the following determinations;

    whether a time of charging/discharging of the secondary battery has reached a predetermined time;

    whether a charging/discharging amount in the secondary battery has reached a predetermined amount; and

    whether a voltage per cell of the plurality of cells has reached a voltage V1 at a lower-limit state of charge in a range of capacity actually used; and

    a discharging controller for discharging the secondary battery until the voltage per cell reaches a voltage V3 that is higher than 1.0 V and is lower than the voltage V1 at the lower-limit state of charge when the memory effect determinator determines that the discharging memory effect has occurred.

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