基于并联-倾斜流道液冷板的锂电池组大倍率放电液冷散热研究

Liquid cooling heat dissipation study of Li-ion battery pack with high discharge rate based on parallel-tilt flow channel liquid cooling plate

以方形磷酸铁锂电池组为研究对象,在传统的并联流道液冷板结构基础上进行优化设计,提出了并联-倾斜流道液冷板,对两种液冷板下6 C大倍率放电的电池组散热性能进行对比。随后,对并联-倾斜流道液冷板开展单因素分析,研究在不同冷却液质量流量和液冷板结构参数(流道宽度、入口宽度和流道倾斜角度)下对电池组散热性能的影响。最后,设计正交实验对获得的仿真结果进行极差分析,结果表明并联-倾斜流道液冷板最优的结构参数组合是流道宽度12 mm,入口流道宽度15 mm,流道角度70°,质量流量30 g/s。在相同的30 g/s质量流量下,最优结构参数组合下电池组的最大温度、最大温差和液冷板的压降相比并联流道液冷板结构分别下降了0.45%、2.96%和29.08%。

This study focused on a prismatic LiFeO,lithium-ion battery pack and proposed an opti-mized design of the parallel-tilted channel liquid cooling plate instead of the traditional parallel chan-nel liquid cooling plate.A 6 C discharge rate liquid cooling simulation was conducted to compare the heat dissipation performance of the battery pack under the two cooling plates.Then,a single-factor analysis was conducted on the parallel-tilted channel liquid cooling plate to investigate the impact of different cooling liquid mass flow rates and cooling plate structural parameters(channel width,inlet width,and channel tilt angle)on the heat dissipation performance of the battery pack.Finally,an or-thogonal experiment was designed to conduct a range analysis on the simulation results.The analysis results show that the optimal combination of structural parameters for the parallel-tilted channel liq-uid cooling plate is a channel width of 12 mm,an inlet width of 15 mm,a channel angle of 70°,and a mass flow rate of 30 g/s.At the same 30 g/s mass flow rate,the maximum temperature and maximum temperature difference of the battery pack and the pressure drop of the liquid cooling plate are de-creased by 0.45%,2.96%and 29.08%,respectively,for the optimal combination of structural param-eters compared with the parallel channel liquid cooling plate structure.