风冷式CPCM锂离子电池热管理系统性能分析

Thermal performance analysis of air cooled thermal management system of lithium-ion battery based on CPCM

针对圆柱形锂离子电池,提出一种风冷式膨胀石墨(EG)石蜡复合相变材料(CPCM)电池模组散热结构。建立了该电池模组的热仿真模型并进行数值模拟,结果表明,EG的质量分数为12%时,电池模组的最高温度及温差同时达到最低值;电池模组进行连续1 C充电/3 C放电充放电循环,空气流速为3 m/s时,在两次充放电循环过程中,每一个时刻都能将电池模组的最高温度及温差控制在合适的工作范围内。在环境温度为37℃时,该热管理系统能将电池模组的最高温度控制在50℃以内,温差控制在5℃以下。

An air cooled thermal management system for lithium-ion battery module was proposed based on composite phase change material(CPCM)combining expanded graphite(EG)with paraffin.The thermal simulation model of the battery module was built,and the numerical simulation was conducted.The results show that when the mass fraction of EG is 12%,the maximum temperature and temperature difference of the battery module reach the lowest value at the same time.When the continuous 1 C charge-3 C discharge cycles are carried out for the battery module and the air flow rate is 3 m/s,the maximum temperature and temperature difference of the battery module can be controlled within the appropriate range at each moment during two charging and discharging cycles.When the ambient temperature is 37℃,the thermal management system can keep the maximum temperature of the battery module within 50℃and the temperature difference below 5℃.