| 摘要 |
PROBLEM TO BE SOLVED: To prevent a battery from being degraded for long service life operation with high charging/discharging efficiency. SOLUTION: This charging/discharging controller 1 of a multistage connecting secondary battery consists of a voltage measuring circuit 3, a charger 4, and a monitor and control device 5. The voltage measuring circuit 3 is capable of measuring the respective voltages of the multistage connecting secondary batteries 2 for measurement of the entire voltage. The charger 4 is capable of charging the multistage connecting secondary batteries 2. The monitor and control device 5 takes in the voltage obtained from the voltage measuring circuit 3, determines as a monitor battery 2i a battery which has reached final discharge voltage at the time of discharge in the multistage connecting secondary batteries 2. Once the monitor battery is determined, the monitor and control device 5 takes in the voltage value of the monitor battery and the entire voltage of the secondary batteries 2, makes a charging means 3 perform charging operation when the voltage value reaches charging control voltage or less, and makes the charger 4 stop charging control when the voltage value of the monitor battery has reached charge regulating voltage Vc or higher.
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