摘要 |
PROBLEM TO BE SOLVED: To provide a dual power supply system and an electric vehicle, suppressing the deterioration of a sub-battery having higher internal resistance.SOLUTION: A sub-battery 22 performs discharge only, and at acceleration, outputs to a drive motor 25, whereas at deceleration, blocks by a diode D2 if a regenerative current occurs in the drive motor 25, to charge a main battery 21 having lower internal resistance with the entire regenerative current and the output of the sub-battery 22. Therefore, the occurrence of a power loss caused by the repetition of a transient state (charge and discharge) in the sub-battery 22 repeats is prevented, and an increase of resistance caused by the frequent repetition of the start and the stop of the discharge is reduced, so that the temperature rise and the deterioration of the sub-battery 22 can be suppressed (prevented). |