快充条件下考虑汇流排生热的电池模组热管理研究

Study on Thermal Management of Battery Module Considering Heat Generation from Busbars under Fast Charging Conditions

建立了一款3.7V/50Ah三元锂电池的电化学-热耦合充电模型,通过仿真和实验的结合验证了模型的正确性,电芯实验和仿真温度最大相对误差为2.04%,电芯实验和仿真电压绝对误差控制在0.1V以内。在此基础上建立了考虑汇流排生热影响的模组生热模型,研究汇流排生热对模组温度场的影响规律,针对水冷板布置在模组底面的原冷却系统对于模组顶部区域的冷却效果不足对其进行改进,提出将冷却板布置在模组侧面,并且将冷却管道形状从蛇形改为螺旋形,分析两种冷却管道条件下的冷却效果,随后分析冷却液流速对模组温度场的影响,确定冷却液流速为0.5m/s时最佳。最后设计的冷却系统模组汇流排体平均温度降低了16.873℃,模组顶部表面平均温度降低了14.353℃,模组电芯体平均温度降低了13.501℃。

In this paper,an electrochemistry-thermal coupling charging model of 3.7V/50Ah ternary lithium battery is established.The correctness of the model is verified by the combination of simulation and experiment.The maximum relative error of cell experiment and simulation temperature is 2.04%,and the absolute error of cell experiment and simulation voltage is controlled within 0.1V.On this basis,a module heat generation model considering the heat generation effect of the busbars was established to study the influence of busbar heat generation on the temperature field of the module.In order to improve the cooling effect of the original cooling system where the water-cooled plate was placed on the bottom surface of the module on the top area of the module,it was proposed to arrange the cooling plate on the side of the module and change the shape of the cooling pipeline from serpentine to spiral,and analyze the cooling effect under two different cooling pipeline conditions,Subsequently,the impact of coolant flow rate on the temperature field of the module was analyzed,and it was determined that the optimal coolant flow rate was 0.5m/s.The average temperature of the bus body of the final designed cooling system module decreased by 16.873℃,the average surface temperature of the module top decreased by 14.353℃,and the average temperature of the module cell body decreased by 13.501℃.