BATTERY COOLING DEVICE

A battery cooling device is mounted on a vehicle and includes a thermosiphon type battery cooling circuit, a temperature control device, and an electronic control unit. The electronic control unit executes, after a circulation stop condition is satisfied, vapor phase temperature rise control for controlling the temperature control device and raising a temperature of a vapor phase side in the battery cooling circuit such that a liquid surface level of a battery cooling refrigerant reaches a level at which circulation of the battery cooling refrigerant is able to be started when the circulation of the battery cooling refrigerant is not started and the liquid surface level is not at the level at which the circulation is able to be started.