HEAT PUMP SYSTEM FOR VEHICLE

A heat pump system may include first and second cooling devices, a battery module, and a chiller to enable simplification of a system by heating or cooling the battery module by one chiller in which a coolant and a refrigerant exchange heat and a main heat exchanger provided in an air conditioning device is connected to each of first and second coolant lines so that the coolant circulated in each of the first and second cooling devices passes through the main heat exchanger, the refrigerant passing through the main heat exchanger exchanges heat with the coolant supplied through the first coolant line and exchanges heat with the coolant supplied through the second coolant line, and a flash tank separating refrigerants which have exchanged heat into a gaseous refrigerant and a liquid refrigerant and selectively discharging the gaseous refrigerant and the liquid refrigerant may be provided in the main heat exchanger.