Electric vehicle thermal management system

Abstract

The invention relates to an electric vehicle thermal management system, and belongs to the field of automobile air conditioners. The system comprises a heat pump air conditioning system loop, a battery thermal management loop and an electric drive system heat dissipation loop; the heat pump air conditioning system loop sequentially comprises an electric compressor, a four-way valve, an external heat exchanger, a liquid storage tank, an HVAC assembly, a gas-liquid separator and a battery cooler in parallel connection with the HVAC assembly in the refrigerant flowing direction; the gas-liquid separator is communicated with the four-way valve and the electric compressor respectively; and the battery heat management loop is connected to the battery cooler and is communicated with the electric drive system heat dissipation loop. The invention aims to simplify the thermal management system, reduce the use of parts, reduce the cost, reduce the risk of refrigerant flow sound, increase the function scenes of the thermal management system and realize the recycling of the energy of the whole vehicle.

Description

technical field [0001] The invention belongs to the field of automobile air conditioners, and relates to a thermal management system of an electric vehicle. Background technique [0002] The following disadvantages exist in the use of electric car air conditioners: during cooling in summer, the high-temperature refrigerant passes through the built-in condenser of the air conditioning box, then dissipates heat through the outdoor condenser, and then returns to the evaporator of the air conditioning box for cooling. At this time, the condenser in the air conditioning box 2 As a heat source, heat radiation and damper air leakage have a deteriorating effect on the cooling performance of the air conditioning box; when the passenger compartment is refrigerated, the outlet of the condenser cannot effectively maintain a supercooled state, and when the refrigerant enters the indoor evaporator, refrigerant flow sounds are likely to occur, and the NVH of the vehicle is comfortable In t...

AI Technical Summary

Problems solved by technology

[0002] The following disadvantages exist in the use of electric car air conditioners: during cooling in summer, the high-temperature refrigerant passes through the built-in condenser of the air conditioning box, then dissipates heat through the outdoor condenser, and then returns to the evaporator of the air conditioning box for cooling. At this time, the condenser in the air conditioning box 2 As a heat source, heat radiation and damper air leakage have a deteriorating effect on the cooling performance of the air conditioning box; when the passenger compartment is refrigerated, the outlet of the condenser cannot effectively maintain a supercooled state, and when the refrigerant enters the indoor evaporator, refrigerant flow sounds are likely to occur, and the NVH of the vehicle is comfortable In the heat pump state, the outdoor condenser is the only direct heat source for evaporation. After long-term operation and frosting, the performance of the heat pump will be affected. At the same time, there is no second heat source for the passenger compartment, and the comfort of use is greatly reduced; the design of the whole heat management system Complicated, with two low-temperature radiators on the coolant side, additional pipelines and valves, the cost is high, and there is room for further cost reduction with two heat exchangers in the air-conditioning box; there is no second heat source in the air-conditioning box, and the ultra-low temperature environment The whole vehicle cannot meet the heating demand; the waste heat of the motor cannot be directly recycled to the heat pump, and the intermediate heat exchanger can only recycle the waste heat of the motor. cannot be efficiently recycled

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