Heat pump system for heating or cooling a battery module by using a chiller for a vehicle

A heat pump system for a vehicle, the heat pump system comprising:

• a first cooling device including a first radiator and a first water pump connected through a first coolant line and circulating a coolant in the first coolant line to cool at least one electrical component and at least one motor mounted on the first coolant line;
• a second cooling device including a second radiator and a second water pump connected through a second coolant line and circulating the coolant in the second coolant line;
• a battery module provided on a battery coolant line selectively connectable to the second coolant line through a first valve mounted between the battery coolant line and the second coolant line;
• a first chiller provided on the battery coolant line and through which the coolant passes, connected to a refrigerant line of an air-conditioning device through a first refrigerant connection line, and making the coolant which selectively flows exchange heat with a refrigerant supplied from the air-conditioning device to control a temperature of the coolant;
• and
• a second chiller selectively connectable to the first coolant line through a second valve, connected to the refrigerant line through a second refrigerant connection line, and recovering waste heat from the coolant selectively flowed into the second chiller, and increasing a temperature of the refrigerant by heat-exchanging heat between the coolant and a refrigerant of the second refrigerant connection line,
• wherein a heat exchanger provided in the air-conditioning device is connected to each of the first and second coolant lines and the refrigerant line so that the coolant circulated in the first and second cooling devices passes through the heat exchanger, and the refrigerant passing through the 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.