Patent attributes
A cooling device of an onboard secondary battery, includes a housing that is provided in a vehicle, and houses a battery pack including a secondary battery and a case that covers the secondary battery, a blower that blows an air at an outside of the vehicle into the housing, a temperature determiner that determines whether or not an air temperature of the outside of the vehicle is lower than a temperature of the secondary battery, and a blow controller that drives the blower, when the temperature determiner determines that the air temperature of the outside of the vehicle is lower than the temperature of the secondary battery.