Power battery module based on coupling cooling of loop heat pipe and phase change material

Abstract

The invention discloses a power battery module based on coupling cooling of a loop heat pipe and a phase change material. The power battery module comprises a battery module, a cooling system and a phase change system, wherein the battery module comprises a plurality of battery cells arranged side by side left and right. The cooling system comprises evaporation plates and a condenser. A number ofevaporation plates are correspondingly arranged between the adjacent battery cells. The phase change system comprises a plurality of solid-solid phase change plates, and the solid-solid phase change plates are correspondingly arranged between the evaporation plates and the battery cells. The upper end of each evaporation plate is firstly communicated with a condensation cavity in a condenser abovethe battery box body through an air guide pipe, and then is communicated with the lower end of the evaporation plate through a liquid guide pipe on the side edge of the condensation cavity to form acirculation loop. The power battery module based on coupling cooling of the loop heat pipe and the phase change material is simple and compact in structure. Efficient and uniform heat dissipation of the battery module is achieved through mutual combination of the loop and the phase change material. Cyclic utilization of an evaporation working medium is achieved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to a power battery module based on coupled cooling of loop heat pipes and phase change materials. Background technique [0002] New energy electric vehicles have obvious advantages in energy saving and emission reduction, and are welcomed by domestic and foreign markets. As one of the key technologies of new energy electric vehicles, power batteries, during the charging and discharging process, complex chemical reactions inside the power batteries A large amount of heat is rapidly generated inside the battery, resulting in an increase in battery temperature and a decrease in performance. A power battery with poor or uneven heat dissipation may experience liquid leakage, outgassing, and smoke. In severe cases, violent combustion or even explosion may occur. Hidden danger. [0003] At present, the thermal management methods of power batteries mainly include air cooling and liquid cooli...

AI Technical Summary

Problems solved by technology

Although the air-cooled thermal management system is low in cost and simple in structure, the convective heat transfer coefficient between the air and the battery is low, and the cooling effect is not ideal. Chinese patent CN109599638A discloses a thermal management system for vehicle batteries, mainly in the vertical direction of the inflow In the direction of the air flow direction, the battery cells are arranged non-uniformly. Although the performance of the air-cooled thermal management system is improved to a certain extent, the low convective heat transfer coefficient between the air and the battery limits its cooling effect and occupies more space;

[0004] The existing liquid cooling method is mainly to immerse the entire battery pack in the cooling tank, or to cover the surface of the battery with a cold plate that circulates the cooling liquid, and absorb the heat generated by the battery pack through the circulating flow of the cooling liquid. The cooling effect is good, but The structure of the liquid-cooled thermal management system is complex, there is a risk of liquid leakage, regular maintenance is required, and the cost of construction and maintenance is high. Chinese patent CN109599640 A discloses a liquid thermal management solution for a cylindrical power battery module, which mainly coils a spiral coil around the battery On the cylindrical shell, it is connected to the cooling system and heating system of the battery module, but the production of a large number of spiral coils is difficult, the cost is high, and it needs to provide power for the circulating pump

[0005] In addition, some power battery thermal management methods use phase change materials, heat pipes or semiconductor refrigerators for cooling. Chinese patent CN109301365A discloses a battery thermal management system in which heat pipes are combined with phase change materials to form a composite plate. There are several rows of bendable and deformable composite plates attached to the ground in parallel, but it simply attaches the evaporating section to the surface of the battery, and the condensing section is set outside the battery pack. Although the heat generated by the battery can be exported to the battery pack, the condensation effect Poor, and the curved heat pipe is not conducive to the circulation of working fluid

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