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.
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.