POWER SUPPLY SYSTEM, ELECTRIC VEHICLE INCLUDING THE SAME, AND METHOD OF CONTROLLING THE POWER SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a power supply system capable of sufficiently utilizing electrical energy stored in a plurality of energy storage devices sequentially selected for use.SOLUTION: When a decision unit 54 determines that SOC of a first auxiliary energy storage device has reached a lower limit, a change control unit 56 generates a change signal SW for changing the first auxiliary energy storage device to a second one. An SOC estimator 52 measures OCV and estimates the SOC based on the measured OCV for the first auxiliary energy storage device separated after determining that the SOC has reached the lower limit. Then, when the estimated SOC is higher than the lower limit, the change control unit 56 generates a change signal SW for changing the second auxiliary energy storage device to the first one again after the SOC of the second auxiliary energy storage device reaches the lower limit.