Vehicle heat pump system

An embodiment of the present invention comprises: a compressor for compressing and circulating a refrigerant; a condenser for condensing the compressed refrigerant; a first expansion valve for expanding the condensed refrigerant; an evaporator for allowing heat exchange and evaporation between cooling water and the refrigerant expanded by the first expansion valve; a cabin cooler that allows heat exchange between air and the cooling water that has passed through the evaporator to cool the indoor space; and a heat sink for heat exchange between outside air and cooling water that cools the electrical component, in which the cooling water that has passed through the heat sink flows into the evaporator during the heating mode. 本发明的实施方式包括：压缩机，该压缩机用于压缩和循环制冷剂；冷凝器，该冷凝器用于冷凝被压缩的制冷剂；第一膨胀阀，该第一膨胀阀用于使冷凝的制冷剂膨胀；蒸发器，该蒸发器用于允许冷却水与由第一膨胀阀膨胀的制冷剂之间进行热交换并蒸发；车厢冷却器，该车厢冷却器允许空气与已经通过蒸发器的冷却水之间进行热交换以冷却室内空间；以及散热器，该散热器用于外部空气与冷却电气部件的冷却水之间进行热交换，其中，已经通过散热器的冷却水在加热模式期间流入蒸发器。