HEAT PUMP SYSTEM FOR VEHICLE

A heat pump system for a vehicle is disclosed. According to an embodiment of the present invention, the subject matter is a heat pump system comprising: a compressor for compressing and discharging a refrigerant; a four-way valve for transferring, to an external heat exchanger or to an internal heat exchanger according to an air-conditioning mode, that refrigerant discharged from the compressor; the external heat exchanger for allowing heat exchange between the external air of a vehicle and the refrigerant transferred from the compressor or the internal heat exchanger, the internal heat exchanger for allowing heat exchange between the refrigerant transferred from the external heat exchanger and the air supplied to the interior space of the vehicle, or for allowing heat exchange between the refrigerant discharged from the compressor and the air supplied to the interior space of the vehicle; an electric component cooling circuit unit which absorbs, according to the air-conditioning mode, the heat generated from electric components mounted in the vehicle, so as to emit same through an electric component radiator, or which absorbs heat, and then allows heat exchange with a refrigerant/electric component coolant heat exchanger, the refrigerant/electric component coolant heat exchanger for allowing heat exchange between the refrigerant discharged from the external heat exchanger and a coolant flowing through an electric component coolant flow path; a first expansion means capable of expanding the refrigerant according to the air-conditioning mode; and a battery chiller, which allows heat exchange, according to the air-conditioning mode, between a battery and the refrigerant discharged from the external heat exchanger, and then transferring the refrigerant to the internal heat exchanger.