This application is a national stage filing under 35 U.S.C. § 371 of International Patent Application Serial No. PCT/CN2018/092133, filed Jun. 21, 2018, which claims priority to Chinese Patent Application No. 201710499039.6, titled “THERMAL MANAGEMENT SYSTEM”, filed on Jun. 27, 2017 with the National Intellectual Property Administration, PRC, the contents of these applications are incorporated herein by reference in their entireties.

FIELD

The present application relates to the technical field of thermal management for a vehicle.

BACKGROUND

An electric vehicle and a hybrid vehicle at present are provided with a battery cooling system, which is used for cooling a battery of the vehicle frequently since the battery is easy to overheat in use. However, in a particular situation, for example, when the circumstance temperature is low, charging and discharging efficiency and a lifespan of the battery may be low. Therefore, an urgent problem to be solved at present is how to improve charging and discharging efficiency of a battery.

SUMMARY

An object of the present application is to provide a thermal management system, which makes a battery keep high charging and discharging efficiency under different circumstance temperatures, improve a lifespan of the battery and achieve a quick charging.

To realize the above object, a technical solution is provided as follows.

A thermal management system includes a battery heat exchanger, a first pump, a second pump, a first heat exchanger, a heater, a radiator and a first valve device;

the first heat exchanger includes a first flow channel and a second flow channel, the first flow channel and the second flow channel are isolated mutually, heat is exchangeable between a liquid in the first flow channel and a liquid in the second flow channel;

the thermal management system includes a refrigerant system and a cooling liquid system, and the refrigerant system includes the first flow channel of the first heat exchanger, the cooling liquid system includes the second flow channel of the first heat exchanger, the battery heat exchanger, the first pump, the second pump, the heater, the first valve device and the radiator;

the cooling liquid system includes a battery loop and a heating/cooling loop, the second flow channel of the first heat exchanger, the battery heat exchanger and the first pump form a part of the battery loop, where the heater, the radiator and the second pump form a part of the heating/cooling loop, and the first valve device is configured to conduct or block a passway between the battery loop and the heating/cooling loop;

the cooling liquid system includes a connecting portion, and the connecting portion is configured to conduct or block the passway between the battery loop and the heating/cooling loop.

To realize the above object, another technical solution is provided as follows.

A thermal management system, including a battery heat exchanger, a first pump, a second pump, a first heat exchanger, a heater, a radiator, a second valve device and a second heat exchanger;

both the first heat exchanger and the second heat exchanger include two flow channels, and a first flow channel of the first heat exchanger and a second flow channel of the first heat exchanger are isolated mutually, heat is exchangeable between a liquid in the first flow channel of the first heat exchanger and a liquid in the second flow channel of the first heat exchanger, a first flow channel of the second heat exchanger and a second flow channel of the second heat exchanger are isolated mutually, heat is exchangeable between a liquid in the first flow channel of the second heat exchanger and a liquid in the second flow channel of the second heat exchanger;

the thermal management system includes a refrigerant system and a cooling liquid system, the refrigerant system includes the first flow channel of the first heat exchanger, the cooling liquid system includes the second flow channel of the first heat exchanger, the battery heat exchanger, the first pump, the second pump, the heater, the second valve device, the second heat exchanger and the radiator;

the cooling liquid system includes a battery loop and a heating/cooling loop, the heating/cooling loop is coupled with the battery loop, the first flow channel of the second heat exchanger, the second flow channel of the first heat exchanger, the battery heat exchanger and the first pump form a part of the battery loop, the second flow channel of the second heat exchanger, the heater, the radiator, the second valve device and the second pump form a part of the heating/cooling loop.

In the above technical solutions, the cooling liquid system includes the battery loop and the heating/cooling loop, in which the heating/cooling loop is coupled with the battery loop. Thus, the battery is heated through the cooling/beating loop when the battery is in a low temperature, and dissipates the heat through the refrigerant system and the cooling/heating loop when the battery is in a high temperature. Therefore, the battery may have a high level of charging and discharging efficiency at both high and low temperatures, which is beneficial to lengthen a lifespan of the battery.

