Thermal management system, control method therefor, and vehicle

A thermal management system, comprising:

• a compressor, the compressor having a suction port and a discharge port;
• a plurality of heat exchange branches disposed in parallel, the heat exchange branches exchanging heat with a battery, the thermal management system having a battery heating mode, a first end of each heat exchange branch communicating with the discharge port in the battery heating mode, and the plurality of heat exchange branches disposed in parallel comprising a pressure regulation sub-branch and a heat exchange sub-branch;
• a first heat exchanger, a first end of the first heat exchanger being connected to a second end of each heat exchange branch through a throttling element, and a second end of the first heat exchanger being connected to the suction port;
• and
• a control module configured to:
• obtain a battery heating signal;
• and
• cause the thermal management system to enter a preheating mode, wherein, in the preheating mode, a total flow rate Q1 of the pressure regulation sub-branch is substantially greater than a total flow rate Q2 of the heat exchange sub-branch.