冷却流道结构对锂电池组液冷性能的影响

Effect of Cooling Channel Structure on Liquid Cooling Performance of Lithium Battery Pack

锂电池适宜的工作环境温度最高为50℃左右,有效的控制电池组温度是新能源汽车行业最重要的工作之一。采用Fluent流体力学计算方法,建立液冷散热锂电池组三维仿真模型。在1 C、3 C放电倍率下,对不同流道结构的电池组进行流-固耦合仿真,结果表明:U型流道电池最高温度比串型和双串型分别降低了2.79、0.69 K;对U流道结构,截面形状长宽比为9∶4、4∶1和1∶1的电池进行散热仿真,截面形状长宽比为1∶1比9∶4、4∶1分别降低了4.09、2.89 K。研究结果验证了流道结构会影响电池组冷却性能,为锂电池组流道结构设计提供了依据。

The most suitable working environment temperature of lithium battery is up to about 50℃.Effective control of battery pack temperature is one of the principal task in the new energy vehicle industry.In this paper,the fluent fluid mechanics calculation method was used to establish a three-dimensional simulation model of liquid-cooled lithium battery pack.At 1C and 3C discharge rates,fluid-solid coupling simulation was carried out for battery packs with different flow channel structures.The results showed that the maximum temperature of U-channel batteries is 2.79 and 0.69 K lower than that of string diffusion and double string diffusion batteries,respectively.For the U-channel structure,the heat dissipation simulation was carried out for the battery with the section shape aspect ratios of 9∶4,4∶1 and 1∶1,and the section shape aspect ratio of 1∶1 was 4.09 and 2.89 K lower than that of 9∶4 and 4∶1,respectively.The results verify that the flow channel structure can affect the cooling performance of battery pack,which provides a basis for the design of the flow channel structure of lithium battery pack.