Heat management system for vehicle

A vehicle thermal management system comprising:

• a first coolant loop configured to pass through all of a battery supplying power to a vehicle, a first valve, a first pump, a third valve, and a first cooling unit;
• a second coolant loop configured to pass through all of a heater, a cabin, a second valve and a second pump;
• a first connecting path connecting the first valve and a second point of the second coolant loop;
• a second connecting path connecting the second valve and a first point of the first coolant loop;
• a first tank supplying coolant to the first coolant loop;
• a second tank supplying coolant to the second coolant loop;
• and
• a second cooling unit configured to cool the cabin,
• wherein the first valve selectively has at least a first position and a second position, allows coolant to circulate through the first coolant loop when the first valve is in the first position, and allows coolant to flow to the second point through the first connecting path when the first valve is in the second position,
• the second valve selectively has at least a first position and a second position, allows coolant to circulate through the second coolant loop when the second valve is in the first position, and allows coolant to flow to the first point through the second connecting path when the second valve is in the second position,
• the third valve selectively has at least a first position and a second position, allows coolant to pass through the first cooling unit when the third valve is in the first position, and allows coolant to bypass the first cooling unit when the third valve is in the second position,
• the first coolant loop is configured to sequentially pass through the third valve, the first cooling unit, the first valve, the first point, and the battery, and
• the second coolant loop is configured to sequentially pass through the second pump, the second point, the heater, the cabin, and the second valve.