【作者】 何伟标； 陈伟； 左青松； 朱国辉； 马颖； 高殷帝；

【Author】 He Weibiao;Chen Wei;Zuo Qingsong;Zhu Guohui;Ma Ying;Gao Yindi;School of Mechanical Engineering and Mechanics,Xiangtan University;Guangxi Yuchai Machinery Co.,Ltd.;Vehicle Measurement,Control and Safety Key Laboratory of Sichuan Province,Xihua University;

【机构】 湘潭大学机械工程与力学学院； 广西玉柴机器股份有限公司； 西华大学汽车测控与安全四川省重点实验室；

【摘要】 随着纯电动汽车的快速发展,市场规模也在不断扩大。锂离子电池作为其核心部件,受到温度变化的显著影响。过高的温度不仅会降低电池性能,还会缩短其循环寿命,因此,实施有效的热管理措施十分重要。本文建立了锂离子电池的三维仿真模型,根据电池的放电实验拟合了体积热源的经验公式,利用CFD平台通过自编程手段实现对电池的热源定义,并基于实验对融化凝固模型进行了验证,结合自然对流的相变材料冷却和相变材料耦合液冷与无热管理方案进行对比,得到无热管理方案最大温度达到326.14K,而采用复合冷却能够将电池组的温度控制在309.96K。同时,对比了放电是否在相变温度区间,得到两者最大温升相差1.67K,温差降幅达到42%。接着,对相变材料的厚度及液冷通道分支的数量进行优化,结果表明:对比无热管理方案,优选方案电池组的最大温度降幅为16.18K,相比于初始方案,电池组的最大温度基本不变,压降下降了0.12Pa,降幅为3.26%。更多还原

【Abstract】 With the rapid development of pure electric vehicles,the market size is also expanding.Lithium-ion battery,as its core component,is significantly affected by temperature changes.Too high temperature will not only reduce the performance of the battery,but also shorten its cycle life,so it is very important to implement effective thermal management measures.In this paper,a three-dimensional simulation model of lithium-ion battery is established.According to the discharge experiment of the battery,the empirical formula of the volume heat source is fitted.The CFD platform is used to define the heat source of the battery by means of self-programming,and the melting and solidification model is verified based on the experiment.Compared with the natural convection phase change material cooling and phase change material coupling liquid cooling and non-thermal management scheme,the maximum temperature of the nonthermal management scheme is 326.14 K.And the composite cooling can control the temperature of the battery pack at 309.96 K.At the same time,whether the discharge is in the phase transition temperature range is compared,and the maximum temperature difference between the two is 1.67 K,and the temperature difference is reduced by 42%.Then,the thickness of the phase change material and the number of liquid cooling channel branches are optimized.The results show that compared with the non-thermal management scheme,the maximum temperature drop of the battery pack in the preferred scheme is 16.18 K.Compared with the initial scheme,the maximum temperature of the battery pack is basically unchanged,and the pressure drop is reduced by 0.12 Pa,a decrease of 3.26%.更多还原