POWER SUPPLY SYSTEM AND AUTOMOBILE

摘要

PROBLEM TO BE SOLVED: To provide a power supply system capable of improving a fuel economy improvement rate.SOLUTION: A power supply system includes: a main battery; a sub battery; a selector for switching charge/discharge current of the main battery and the sub battery; and a control section for estimating SOC of the sub battery and controlling a current switching operation by the selector on the basis of the estimated SOC of the sub battery. The control section controls the selector (S210) so that the main battery is charged (S110) after charging the sub battery up to a use upper limit SOC (S104-108) when receiving regenerative electric power from an alternator by a power storage device (S102), and so that discharge is performed from the main battery 1 after performing discharge until the sub battery 2 is discharged up to a use lower limit SOC (S204-208) when performing discharge from the power storage device to a discharge load 14 (S202).SELECTED DRAWING: Figure 4