Vehicular heat exchange system and motor unit used in same

A motor unit that is used in a vehicular heat exchange system including a first heat exchanger for causing heat to be exchanged between refrigerant and air in an interior of a vehicle, a heating circuit for causing the refrigerant with a temperature higher than a temperature of the air in the interior of the vehicle to circulate through the first heat exchanger, and a secondary battery where charging and discharging of power are performed, wherein

• the vehicular heat exchange system includes a case and a switching valve, the case being for covering the secondary battery, a cooling water circuit for causing cooling water that exchanges heat with the motor unit to circulate, and a second heat exchanger for causing heat to be exchanged between the refrigerant and the cooling water, the second heat exchanger being provided in a manner including a portion of the heating circuit downstream of the first heat exchanger and a portion of the cooling water circuit, the switching valve being opened to cause the cooling water to circulate at least on one of the secondary battery side and the motor unit side, and
• the motor unit heats the cooling water that is circulated through the motor unit by opening of the switching valve, and supplies the cooling water to the second heat exchanger.