Heat pump system for vehicle

A heat pump system for a vehicle, comprising:

• a battery coolant line connected to a battery module and into which a coolant flows;
• a cooling device including a radiator and a first water pump connected to a coolant line, to circulate a coolant in the coolant line to cool electrical equipment, wherein the cooling device is selectively connected to the battery coolant line via a first valve;
• a chiller disposed in the battery coolant line, connected to a refrigerant line of an air conditioner via a connecting line, and configured to adjust a temperature of a coolant or to increase a temperature of a refrigerant by selectively exchanging heat between the coolant and the refrigerant flowing into the chiller;
• and an integrated control valve connected to the refrigerant line and the connecting line to adjust a flow direction of a refrigerant circulated in the air conditioner and to selectively expand a refrigerant passing through the inside of the integrated control valve, wherein the air conditioner includes:
• a heating, ventilation, and air conditioning (HVAC) module connected to the air conditioner via the refrigerant line and having a door disposed therein to allow outside air passing through an evaporator to selectively flow into an internal condenser according to cooling, heating, and heating/dehumidifying modes of the vehicle;
• a compressor connected between the evaporator and the internal condenser via the refrigerant line;
• an accumulator disposed in the refrigerant line between the compressor and the evaporator;
• a first condenser connected to the internal condenser via the refrigerant line and disposed inside of the radiator;
• a second condenser connected to the first condenser via the refrigerant line and disposed in the front of the vehicle;
• and an expansion valve disposed in the refrigerant line connecting the second condenser and the evaporator, wherein the connecting line is connected to the accumulator to allow a refrigerant passing through the chiller to be supplied to the accumulator, wherein when the battery module is cooled using the refrigerant, the integrated control valve expands a refrigerant supplied from the second condenser through the refrigerant line and then discharges the refrigerant to the connecting line to flow into the chiller, and wherein the refrigerant line that connects the internal condenser and the first condenser and the refrigerant line that connects the second condenser and the evaporator are respectively connected to the integrated control valve, wherein the integrated control valve is configured to close the refrigerant line connected to the first condenser and the second condenser during a heating mode or a heating and dehumidifying mode, and wherein the connecting line is connected to the accumulator from the integrated control valve through the chiller and a sub heat exchanger.