Whole vehicle thermal management system and method for pure electric commercial vehicle

Abstract

The invention provides a whole vehicle thermal management system and method for a pure electric commercial vehicle. The system comprises an HVAC subsystem; the HVAC subsystem comprises a compressor, a refrigeration three-way valve, a condenser, an expansion valve, an evaporator, a battery and a heat pump; the compressor is connected with the condenser through a refrigeration three-way valve; the condenser and the heat pump are respectively connected with the expansion valve; the output end of the expansion valve is connected with the battery and the evaporator. The battery and the evaporator are connected with the compressor. Redundancy of components such as the compressor, the evaporator and the condenser is reduced, and the cost of the battery pack cooling module is saved; in the aspect of the energy efficiency ratio of the whole vehicle, the capacity utilization rate of the whole vehicle is improved, particularly in winter, waste heat of a motor is effectively utilized, the power consumption for heating a cab can be reduced from 10 kW to 3 kW in winter, and the driving mileage of the vehicle is greatly increased; in the aspect of cab comfort, the heating effect of the cab in winter is improved.

Description

technical field [0001] The invention relates to the field of thermal management of electric vehicles, in particular to a thermal management system and method for a pure electric commercial vehicle. Background technique [0002] At present, different from traditional internal combustion engine vehicles, the thermal characteristics of electric vehicles have changed greatly with the change of power system. The vehicle thermal management of pure electric vehicles must not only meet the requirements for comfortable driving in the passenger cabin, but also realize the unified management of vehicle heat through the transfer of heat between the motor, battery, refrigeration unit, heat pump unit and other parts, and maintain the temperature of each component. Always at a safe operating temperature. [0003] At this stage, the thermal management of pure electric commercial vehicles has failed to realize the systematic thermal management of the whole vehicle. There are but not limite...

AI Technical Summary

Problems solved by technology

[0006] c) In the existing pure electric commercial vehicles equipped with heat pumps, the heat pump unit directly absorbs heat from the external environment, which has low efficiency and poor heating effect;

[0007] d) In winter, the battery pack completely relies on the PTC of the battery module to heat the battery under low power state, resulting in additional consumption of battery power;

[0008] e) The heat of the motor cooling system (including inverter, charger, motor controller, etc.) is directly discharged to the external environment through the radiator, resulting in waste of heat

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