Patent attributes
A lower battery module includes lower batteries and lower cooling air passages. An upper battery module is provided at an downstream of the lower battery module in a flow direction of the cooling air. The upper battery module includes upper batteries and upper cooling air passages. An intermediate duct is provided between the upper battery module and the lower battery module to prevent leakage of the cooling air. The intermediate duct includes a cutwater portion. The cutwater portion is provided along an inner circumference of the intermediate duct to cut a continuous flow of water from an inside of the upper battery module to an inside of the lower battery module.