POWER SUPPLY SYSTEM

A power supply system for a vehicle includes a management ECU that controls output power of first and second batteries in a normal mode or an output priority mode, first cooler that cools the first battery, a second cooler that cools the second battery, and a cooling circuit ECU that controls first and second cooling output of the coolers. In a case where an operation mode of the management ECU is the output priority mode and the first battery has a cooling remaining-capacity, the cooling circuit ECU increases the first cooling output as compared with a case where the operation mode is the normal mode. In a case where the operation mode is the output priority mode and the second battery has a cooling remaining-capacity, the cooling circuit ECU increases the second cooling output as compared with the case where the operation mode is the normal mode.