Integrated thermal management system for electric vehicles

Abstract

The invention discloses an integrated thermal management system for electric vehicles. The integrated thermal management system comprises a battery integrated thermal management system, a motor integrated thermal management system and a refrigeration and heating cycle system of a heat pump air conditioner, wherein the battery integrated thermal management system comprises a first water pump, a first phase change heat exchanger, a first expansion tank and a battery water-cooling coil; the motor integrated thermal management system comprises a second water pump, a second phase change heat exchanger, a second expansion tank, a radiator and a first motor water-cooling coil; and the refrigeration and heating cycle system of the heat pump air conditioner comprises a condenser, the heat pump air conditioner, an evaporator and a dryer. The battery integrated thermal management system and the motor integrated thermal management system are connected with the refrigeration and heating cycle system of the heat pump air conditioner through the first phase change heat exchanger and the second phase change heat exchanger. During a heating cycle, the first phase change heat exchanger and the second phase change heat exchanger transfer stored energy to the evaporator for preheating. During a refrigeration cycle, the evaporator transfers heat to the first phase change heat exchanger and the second phase change heat exchanger for storing energy. The integrated thermal management system for the electric vehicles shares the evaporator, decreases the number of evaporators and causes structure layouts inside the electric vehicles to be reasonable.

Description

technical field [0001] The invention belongs to the technical field of thermal management systems for electric vehicles, and in particular relates to an integrated thermal management system for electric vehicles used for vehicle batteries, motors and air conditioners. Background technique [0002] With the increasingly serious problems of energy shortage, rising oil prices, and environmental pollution, the battery system is an indispensable and important part of the new energy system that replaces oil. Electric vehicles have the problems of insufficient mileage and large fluctuations in mileage with changes in the external environment temperature, which creates "range anxiety" for drivers. Therefore, the establishment of a comprehensive thermal management system to effectively store and utilize the energy of the vehicle is the key technology to extend the driving range and realize the large-scale industrialization of electric vehicles. From the perspective of heat transfer ...

AI Technical Summary

Problems solved by technology

The use of air as the heat transfer medium is to directly introduce air so that it flows through the module to achieve heat dissipation. Generally, fans, inlet and outlet air ducts and other components are required. A separate system needs to be established to provide heating or cooling functions, independent of battery status. control, which also increases vehicle energy consumption and cost

For heat transfer with liquid as the medium, it is necessary to establish a heat transfer channel between the module and the liquid medium, such as a water jacket, to conduct indirect heating and cooling in two forms of convection and heat conduction. The heat transfer medium can be water, ethylene glycol or even Refrigerants, due to the need for fans, water pumps, heat exchangers, heaters, pipelines and other accessories, make the structure too large and complex, and also consume battery energy, reducing the power density and energy density of the battery

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