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Charging and discharging control device for secondary battery

  • US 5,631,533 A
  • Filed: 03/15/1995
  • Issued: 05/20/1997
  • Est. Priority Date: 03/15/1994
  • Status: Expired due to Fees
First Claim
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1. A charging and discharging control device for a secondary battery, said control device comprising:

  • discharging control means for stopping discharging of said secondary battery when a voltage thereof becomes less than a predetermined discharge stop voltage during discharging of said secondary battery;

    charging control means for stopping charging of said secondary battery when the voltage thereof is in excess of a predetermined charge stop voltage during charging of said secondary battery; and

    history estimating means for estimating the charging/discharging history of said secondary battery on the basis of condition thereof;

    wherein said discharging control means corrects said predetermined discharge stop voltage so as to be increased corresponding to the charging/discharging history estimated by said history estimating means;

    wherein said charging control means corrects said predetermined charge stop voltage so as to be decreased corresponding to the charging/discharging history estimated by said history estimating means,wherein said secondary battery consists of a plurality of secondary batteries connected with each other;

    wherein said charging control means includes current changing means which, in case that a charging voltage in a specified secondary battery reaches said predetermined charge stop voltage, directs a flow of charging current to the other secondary batteries by a by-pass operation of the flow of charging current; and

    wherein said history estimating means estimates the charging/discharging history of said secondary battery on the basis of a number of said by-pass operations.

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