Cooling structure of an electrical device in a vehicle

摘要

In a power supply unit (19) disposed below a floor behind a seat, battery modules (37) are disposed in a lower position, and a DC/DC converter (41) and a motor driving inverter (42) are disposed side by side in a vehicle width direction above the battery modules (37). Thus, cooling air flowing from the front side to the rear side of a vehicle body is divided into upper and lower portions to cool in parallel the DC/DC (41) and the motor driving inverter (42) on the upper side and the battery modules (37) on the lower side. Thus, it is possible to simplify a passage of the cooling air to reduce the size of the entire power supply unit (19), and improve mountability of the power supply unit (19) on the vehicle body. Also, it is possible to apply cooling air at low temperature before heat exchange to all the battery module (37), the DC/DC converter (41), and the motor driving inverter (42), thereby enhancing cooling effect.