Thermal management system for fuel cell vehicle and control method thereof

A thermal management system for a fuel cell vehicle, the thermal management system comprising:

• a first line including a coolant pump and a fuel cell stack;
• a second line including a coolant heater and a phase change material (PCM) and connected to the first line to form a first loop in which the coolant pump, the stack, the coolant heater, and the PCM are arranged;
• a third line including a radiator and connected to the first line to form a second loop in which the coolant pump, the stack, and the radiator are arranged;
• and
• an opening and closing valve opening and closing each of the first line, the second line, and the third line to allow the coolant to circulate in at least one of the first loop and the second loop,
• wherein the PCM is configured to be heat-exchanged with each of the coolant heater and the coolant,
• wherein:
• the coolant heater has at least one heater core disposed on the basis of the second line,
• the PCM is installed to surround at least a portion of the heater core and the second line, and
• the coolant heater further has a metal coil wound around the heater core and an outer circumferential portion of the second line to thermally connect the heater core and the second line.