초록 ▼

A charging and discharging control device for a secondary battery includes a secondary battery, a controller, a charging unit for charging the battery, a ON/OFF switch between the battery and the charging unit and a control switch for controlling the discharge current. At charging the battery, the O

A charging and discharging control device for a secondary battery includes a secondary battery, a controller, a charging unit for charging the battery, a ON/OFF switch between the battery and the charging unit and a control switch for controlling the discharge current. At charging the battery, the ON/OFF switch is turned on and a voltage Ve of the secondary battery is compared with a charge stop voltage Vmax by the controller. If Ve≥Vmax, the charging operation is ended. At discharging, the control is turned on and the voltage Ve is compared with a discharge stop voltage Vmin. If Ve≤Vmin, the discharging operation is ended. Corresponding to charging/discharging history of the battery, the controller corrects the voltage Vmin so as to be increased and the voltage Vmax so as to be decreased, whereby the life span of the secondary battery can be extended.

대표청구항 ▼

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

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.