Thermal management system and control method thereof, electric vehicle

Abstract

The invention provides a thermal management system and its control method, and an electric vehicle. The thermal management system includes a compartment refrigerant circulation subsystem, a battery refrigerant circulation subsystem, a motor refrigerant circulation subsystem, and a battery refrigerant circulation subsystem. The second heat exchanger forms heat exchange with the compartment refrigerant circulation subsystem, the motor refrigerant circulation subsystem forms heat exchange with the compartment refrigerant circulation subsystem through the third heat exchanger, and the battery refrigerant circulation subsystem communicates with the motor The pipelines of the brine circulation subsystem form a through connection through the first four-way valve, and the three-way valve can bypass the external heat exchanger through the second brine pipeline. According to the thermal management system and its control method of the present invention, the electric vehicle can make full use of the waste heat of the motor and the battery to compensate for the lack of heating capacity of the compartment under low temperature conditions, and on the other hand, it can also improve the accuracy and speed of battery temperature control, Improve battery energy efficiency and reduce battery temperature difference.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a thermal management system, a control method thereof, and an electric vehicle. Background technique [0002] Pure electric vehicles have zero fuel consumption, low cost of use, and good market prospects, and are favored by many companies. At present, the problem of pure electric vehicles is that the cruising range is short. The root cause is that the operating temperature of the battery affects the charging and discharging capacity and life of the battery. Especially under low temperature conditions, the performance is seriously attenuated, and it cannot output enough power to drive the motor to work normally. At the same time, the temperature of the driving motor should not be too high. If the internal temperature of the motor is too high, the efficiency of the motor will decrease. In severe cases, the coil inside the motor will be ablated and even the coil...

AI Technical Summary

Problems solved by technology

At present, the problem of pure electric vehicles is that the cruising range is short. The fundamental reason is that the operating temperature of the battery affects the charge and discharge capacity and life of the battery. Especially under low temperature conditions, the performance is seriously attenuated, and it cannot output enough power to drive the motor to work normally.

At the same time, the temperature of the driving motor should not be too high. If the internal temperature of the motor is too high, the efficiency of the motor will decrease. In severe cases, the coil inside the motor will be ablated and even the coil will be short-circuited to damage the motor. However, the car air conditioner has the problem of insufficient heating capacity at low temperature.

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