并联液冷电池热管理系统仿真分析

Simulation Analysis of Thermal Management System of Parallel Liquid Cooled Battery

提出一种基于微型通道冷板的并联液体冷却系统。根据AMESim中已验证的电池子模型,搭建并联液冷电池热管理系统,仿真分析放电倍率范围1~5C、环境温度范围5~35℃时,对电池模组放电性能的影响以及冷却液温度范围5~30℃、入口冷却液质量流量范围0.01~1.00 kg/s和5种乙二醇-水混合比对电池模组放电冷却的影响。研究表明:纯放电模拟时,电池模组温升随放电倍率的增加而增加,随环境温度的增加而减小,在环境温度35℃、放电倍率为5C时,电池模组温度高达59.1℃,有热失控风险。放电冷却模拟时,电池模组平均温度随冷却液温度的降低而降低,随入口冷却液质量流量的增加而降低,随冷却液中乙二醇的占比增加而升高。冷却液温度由5℃升高到30℃,电池模组最大温差均低于5℃;质量流量大于0.01 kg/s时,最大温差均低于5℃;混合比为1∶4时,冷却效果最佳,最大温差均在5℃内。

A parallel liquid cooling system based on micro-channel cold plates was proposed.According to the validated battery sub-model in AMESIM,a parallel liquid-cooled battery thermal management system was built.The influence of discharge rate range of 1-5C and ambient temperature range of 5~35℃on the discharge performance of the battery module,as well as the coolant temperature range of 5~30℃,the inlet coolant mass flow range of 0.01~1.00 kg/s and 5 kinds of ethylene glycol-water mixing ratio on battery module discharge cooling was simulated and analyzed.The research indicated that during pure discharge simulation,the temperature rise of the battery module increased with the increase of the discharge rate and decreased with the increase of the ambient temperature.At an ambient temperature of 35℃and a discharge rate of 5C,the temperature of the battery module reached 59.1℃,with a risk of thermal runaway.In the simulation of discharge cooling,the average temperature of the battery module decreased with the decrease of the coolant temperature,decreased with the increase of the inlet coolant mass flow rate,and increased with the increase of the proportion of ethylene glycol in the coolant.The coolant temperature increased from 5℃to 30℃,the maximum temperature difference of the battery module was less than 5℃;when the value of mass flow rate was greater than 0.01 kg/s,the maximum temperature difference was lower than 5℃;when the mixing ratio was 1:4,the cooling effect was the best,the maximum temperature difference was within 5℃.