Heat pump system for a vehicle

A heat pump system for a vehicle, comprising:

• an air conditioner unit including a compressor, an internal condenser, a heat-exchanger, a first expansion valve, an evaporator, and an accumulator connected via a refrigerant line through which a refrigerant flows;
• a chiller provided on a first connection line connected to the refrigerant line, and configured to adjust a temperature of a coolant by exchanging heat between the refrigerant supplied from the air conditioner unit via the refrigerant line and a coolant;
• a second expansion valve provided on the first connection line at an upstream end of the chiller;
• and
• a third expansion valve provided on the refrigerant line between the internal condenser and the heat-exchanger,
• wherein the air conditioner unit further includes:
• an internal heat-exchanger provided inside the accumulator and configured to exchange heat between the refrigerant selectively supplied from the internal condenser or the heat-exchanger and the refrigerant selectively supplied from the evaporator or the chiller, wherein the internal heat-exchanger is configured to supply a liquid refrigerant among the heat-exchanged refrigerant to the first expansion valve or the second expansion valve;
• a second connection line including:
• a first end connected to the refrigerant line between the internal condenser and the heat-exchanger, and a second end connected to the refrigerant line between the evaporator and the accumulator;
• and
• a third connection line including:
• a first end connected to the third expansion valve, and a second end connected to the refrigerant line between the heat-exchanger and the internal heat-exchanger, and
• wherein a flow of the refrigerant is controlled based on at least one mode for a temperature adjustment of a vehicle interior or for a temperature adjustment of a battery module.