车用锂离子电池组液冷散热系统设计与优化

Design and Optimization of Liquid Cooling System for Lithium-ion Battery Packs in Vehicles

中文关键词: 锂离子电池组  液冷式  双波纹蛇形  石墨烯薄膜

英文关键词: lithium-ion battery pack  liquid cooling  double corrugated serpentine  graphene film

中文摘要:

      目的 解决传统热管理系统中锂离子电池组在充放电过程中温度过高、温差过大等问题。方法 以液冷方式为主要手段，在传统蛇形冷却通道的基础上设计1种单流入单流出的微通道结构和2种双流入单流出的微通道结构，并采用新型高导热材料石墨烯薄膜作为散热辅助材料。基于有限元仿真软件从电池组的最高温度、温差、温升和流体压力4个角度进行比较分析。结果 优化后电池组的最高温度由36.4 ℃降至36 ℃，温差由8.7 ℃降至3.9 ℃，电池组的散热能力及温度一致性得到提高。结论 双流入单流出结构优于单流入单流出结构，其中双波纹蛇形为最佳的液冷微通道结构，石墨烯薄膜的采用可进一步提高电池组的温度一致性。

英文摘要:

      The work aims to solve the problems of high temperature and large temperature difference of lithium-ion battery pack in the traditional thermal management system during the charging and discharging process. The liquid cooling method was taken as the main means to design a single-inflow and single-outflow microchannel structure and two double-inflow and single-outflow microchannel structures on the basis of the traditional serpentine cooling channel, and a new type of high-thermal-conducting material, graphene film, was adopted as the auxiliary heat dissipation material. Based on the finite element simulation software, a comparative analysis was carried out from four perspectives:maximum temperature, temperature difference, temperature rise and fluid pressure of the battery pack. The maximum temperature of the optimized battery pack was reduced from 36.4 ℃ to 36 ℃, and the temperature difference was reduced from 8.7 ℃ to 3.9 ℃, which improved the heat dissipation capability and temperature consistency of the battery pack. The double-inflow and single-outflow structure is better than the single inflow-single outflow structure, in which the double corrugated serpentine is the optimal liquid-cooling microchannel structure, and the adoption of graphene film can further improve the temperature consistency of the battery pack.