Thermal management system for electric vehicles

A thermal management system for electric vehicles, the thermal management system comprising a water-cooled cooling system configured to cool power electronic parts and a battery, wherein the water-cooled cooling system comprises:

• a first radiator, a first electric water pump, and a first coolant line connected to the first radiator, the first coolant line being configured to allow a coolant to be circulated by the first electric water pump;
• a second radiator, a second electric water pump, and a second coolant line connected to the second radiator, the second coolant line being configured to allow a coolant to be circulated by the second electric water pump;
• and
• a first flow control device and a second flow control device installed at upstream ends and downstream ends of the first radiator and the second radiator so as to control a coolant flow direction between the first coolant line, the second coolant line, and a third coolant line,
• wherein the third coolant line is installed so as to connect the first flow control device and the second flow control device to each other,
• wherein at least some of the power electronic parts are installed on the first coolant line between the first flow control device and the second flow control device so as to be cooled by the coolant,
• wherein the remainder of the power electronic parts are installed on the third coolant line between the first flow control device and the second flow control device so as to be cooled by the coolant,
• wherein the battery is installed on the second coolant line so as to be cooled by the coolant,
• wherein a bypass line is installed so as to connect a front end and a rear end of the second radiator to each other such that the coolant that has passed through the battery bypasses the second radiator,
• wherein a three-way valve is installed at a position at which the bypass line diverges from the second coolant line,
• wherein a third electric water pump and a battery cooling chiller configured to cool the coolant passing through the battery through heat exchange between the coolant and a refrigerant of an air conditioner are installed on the second coolant line, and
• wherein, in a state in which a flow passage toward the bypass line is opened by the three-way valve, the coolant circulated by the third electric water pump passes through the battery and the chiller while flowing along the second coolant line and then passes through the bypass line.