BATTERY TEMPERATURE CONTROL DEVICE

When the temperature TB of a battery is higher than or equal to a threshold S and there is a request to cool the battery, the battery is cooled in a second cooling mode in a region where the outside air temperature To is lower than or equal to a threshold S. In the second cooling mode, the battery is cooled by heat dissipation from a low-temperature radiator. When the temperature TB is higher than or equal to a threshold S, the battery is cooled in a first cooling mode in which the battery is cooled using a refrigeration cycle (refrigerant circuit). In a region where the temperature TB is lower than the threshold S and the outside air temperature To is higher than the threshold S, the cooling mode switching control is performed.