基于仿生蜂窝流道的锂电池组液冷散热研究

Study on Liquid Cooling Heat Dissipation of Lithium Battery Pack Based on Bionic Honeycomb Flow Channel

液冷散热作为常用的散热方式广泛应用于新能源汽车中,因其良好的散热能力在电池热管理中被广泛研究。基于电动汽车锂电池生热特点,设计了一种新型仿生蜂窝流道,建立了锂电池组液冷散热模型并与并联直流道进行散热性能对比,证明了仿蜂窝流道的优越性。此外,探讨了环境温度、放电倍率、入口雷诺数三因素对锂电池组散热的影响。结果表明,冷却液在排布II下作用下,且在4C高放电倍率和40˚C高温环境下,当冷却液入口温度26˚C,临界雷诺数为80时,电池组放电结束时最高温度为40˚C,最大温差为3.19˚C,冷却液压降仅为3.34 Pa。

Liquid-cooling heat dissipation is a widely used method in new energy vehicles to dissipate heat.It has been extensively studied for battery thermal management due to its excellent heat dissipation capabilities.A new type of bionic honeycomb flow channel has been designed based on the heat generation characteristics of lithium batteries in electric vehicles.A liquid-cooling heat dissipation model for lithium battery packs has been established and compared with the parallel direct current channel to evaluate its heat dissipation performance,which has proven the superiority of the bionic honeycomb flow channel.In addition,the effects of ambient temperature,discharge multiplier,and inlet Reynolds number on the heat dissipation of lithium battery packs are discussed.The results show that the coolant under the action of row II,and in the environment of 4C high discharge multiplicity and 40˚C high temperature when the coolant inlet temperature is 26˚C and the critical Reynolds number is 80,the maximum temperature at the end of the battery pack discharge is 40˚C,the maximum temperature difference is 3.19˚C,and the cooling pressure drop is only 3.34 Pa.