BATTERY COOLING DEVICE

A battery cooling device, including a plurality of coolers to cool a battery using insulating oil, includes: a communication pipe to connect the plurality of coolers to each other, the communication pipe allowing the insulating oil to flow therethrough; a water level sensor provided in a vertical portion of the communication pipe, the vertical portion extending in a vertical direction, and detects a water level in the vertical portion; a shutdown valve provided in the communication pipe; and a control device configured to control the shutdown valve. Further, the control device closes the shutdown valve when the water level sensor detects a water level rise equal to or greater than a predetermined value.