Vehicle heat pump system

A vehicle heat pump system comprising:

• a compressor configured to compress and circulate a refrigerant;
• a first heat exchanger configured to condense the compressed refrigerant;
• a first expansion valve configured to expand the condensed refrigerant;
• a second heat exchanger configured to evaporate the refrigerant expanded by the first expansion valve by allowing the refrigerant to exchange heat with a coolant;
• a cabin cooler configured to cool a vehicle interior by allowing the coolant having passed through the second heat exchanger to exchange heat with air;
• a heat-dissipation heat exchanger configured to allow the coolant for cooling an electrical component to exchange heat with outside air,
• a refrigerant circulation line in which the compressor, the first heat exchanger, the second heat exchanger, and a chiller are disposed and the refrigerant circulates;
• a refrigerating line configured to cool a heat generating component by circulating the coolant that exchanges heat with air or the refrigerant;
• a cooling line in which the cabin cooler is disposed, the cooling line being configured to cool the vehicle interior by using the coolant passing through the second heat exchanger;
• and
• a cooling connection line configured to connect the cooling line and the refrigerating line, wherein the coolant having passed through the heat-dissipation heat exchanger flows into the second heat exchanger in a heating mode;
• and
• wherein the refrigerating line and the cooling line are connected by a first direction switching valve, and the refrigerating line and the cooling line are separated and connected depending on an air conditioning mode.