HEAT PUMP SYSTEM FOR VEHICLE

A heat pump system for vehicle may include first cooling apparatus that includes first radiator and first water pump connected by first coolant line, second cooling apparatus that includes second radiator and second water pump connected by second coolant line, battery module provided in battery coolant line selectively connectable to second coolant line through first valve, and chiller provided in battery coolant line, connected to refrigerant line of air conditioner through refrigerant connection line, and adjusting coolant temperature by heat-exchanging selectively received coolant with refrigerant, wherein main heat-exchanger provided is connected to first and second coolant lines to receive coolant circulating first and second cooling apparatuses, and wherein main heat-exchanger is connected to first and second connection lines connected to refrigerant line through refrigerant valve to condense or evaporate refrigerant through heat-exchanging with coolant such that flow direction of refrigerant is changed depending on mode of vehicle.