Liquid cooling assisted phase-change material heat exchange battery thermal management system

Abstract

The invention discloses a liquid cooling assisted phase change material heat exchange battery thermal management system. The system comprises a liquid cooling auxiliary system and a battery thermal management module which are connected through a liquid cooling heat exchanger, the battery thermal management module is composed of a module shell, a battery module and the liquid cooling heat exchanger, the module shell is a closed vacuum container formed through a forming process, the module shell is filled with a phase change material, and a battery module embedding concave channel or an electrode opening is reserved in a lower portion of the module shell; the battery module is arranged in an external concave channel of the module shell to form indirect contact heat exchange of two side surfaces and a top surface, or is arranged in the module shell to form a battery module full-outer-surface soaking heat exchange structure; the liquid cooling heat exchanger is arranged on an upper portionof the module shell, two ends of the liquid cooling heat exchanger are connected with a liquid inlet and a liquid outlet of the module shell; and the phase change material is a low-boiling-point phase-change material. In the invention, heat exchange is performed by utilizing phase-change material evaporation and condensation principles, high-load working conditions are completely adapted, temperature uniformity of the battery is ensured, energy consumption is reduced, and a phase-change heat storage effect is good.

Description

technical field [0001] The invention belongs to the field of battery thermal management of battery vehicles, and in particular relates to a battery thermal management system with liquid-cooled assisted phase-change material heat exchange. Background technique [0002] With the rapid development of power batteries, one of the important development directions of power batteries is to increase battery power, realize fast charging, and improve battery life. At the same time, the driving conditions of the car are complex and changeable, and the battery temperature is too high or too low, which will greatly affect the battery capacity, service life and safety. Therefore, thermal management of electric vehicle batteries is of great significance. [0003] In recent years, as the energy density and load of batteries have increased, BTMS have been using powerful cooling systems, mostly using liquid cooling loops with a large number of microchannels. However, such a system has the di...

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Problems solved by technology

[0004] At present, the gasification of low-boiling-point phase-change materials is used to absorb the heat generated by the battery to reduce the battery’s operating temperature. It does have a good cooling effect for reducing the battery temperature, but there are also some problems: Phase change material battery thermal management devices are rarely equipped with gaseous phase change material recovery devices, which wastes resources and increases costs and environmental pollution; phase change materials without power drainage are an important advantage of low boiling point phase change materials at present, but there is no power The riser tube used for drainage is in line contact with the battery pack, and the heat transfer area is limited; the gaseous phase change material condenses on the top air-cooled cold plate, and the return method and confluence area are limited. The heat dissipation effect is not good

[0005] In addition, the heat of the phase change material needs to be dissipated to an additional external cooling system, and the external additional cooling system is mostly air cooling. The operating conditions of electric vehicles are complex and changeable, and only rely on air cooling to cool the phase change. The material cannot meet the high thermal load operating conditions of electric vehicles, so it is impossible to apply the phase change material battery thermal management system to the actual complex and changeable battery management system

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