不同冷却策略下动力电池模块的热性能比较研究

Comparative Study on Thermal Performance of Power Battery Module under Different Cooling Strategies

随着新能源汽车技术的快速发展,快充快放正逐渐成为动力电池的主流工作模式,产热功率增加,热性能对动力电池的影响也随之增大。采用数值模拟研究了快充快放条件下动力电池组在不同倍率充放电下的传热特性,比较了纯相变冷却和液冷与相变材料耦合的冷却对电池模块散热效果,分析了上述两种散热方式对电池模块温差和最高温度的控制作用。数值模拟结果表明,当5C快充,立即5C快放条件下,选择最佳流速0.05m/s,电池模块温度最高温度控制在47.33℃,温差为3.39℃,与采用纯相变冷却方式相比,电池最高温度降低34.57℃,温差降低1.14℃。结果表明快充快放条件下液冷与相变材料耦合系统具有良好的动力电池热管理效果。

With the rapid development of new energy vehicle technology,fast charging and fast discharging of power battery is gradually becoming the mainstream working mode.The heat transfer characteristics of power battery pack at different rates of charge and discharge under the condition of fast charge and fast discharge are studied by numerical simulation.The heat dissipation effects of pure phase change cooling and liquid cooling coupled with phase change materials on the battery module are compared,and the control effects of the above two heat dissipation methods on the temperature difference and maximum temperature of the battery module are analyzed.The numerical simulation results show that when 5C fast charging and 5C fast releasing,the optimal flow rate is 0.05m/s,the maximum temperature of the battery module is controlled at 47.33℃,and the temperature difference is 3.39℃.Compared with the pure phase change cooling mode,the maximum temperature of the battery is reduced by 34.57℃,and the temperature difference is reduced by 1.14℃.Therefore,the coupled system of liquid cooling and phase change materials has a good thermal management effect under the condition of fast charging and fast discharging.