基于电 热耦合模型的锂离子电池组 热管理系统设计与优化

姜水生 何志坚 文 华

China Mechanical Engineering - - 中国机械工程 -

Design and Optimization of Thermal Management Systems for Lithium-ion Battery Module Based on Electro-thermal Model

JIANG Shuisheng HE Zhijian WEN Hua

School of Mechanical and Electronic Engineering of Nanchang University,Nanchang,330031 Abstract: Because of the uneven heat generation in battery module,the temperature rose differently and the working performances decreased. Thus the heat generation mechanism would be studied so that the electro ⁃ thermal model might be established,then the regularities of current density and heat genera⁃ tion rate distribution in stacks might be got. Battery module was simulated at different discharge rates based on those regularities,and coolant velocity was calculated based on cooling requests(temperature was between 25 ℃ and 40 ℃ , temperature difference was below 5 ℃) and thermophysical parameter, then the cooling system might be designed. Simulation results of battery modules of several cool plates of different thickness were studied in different discharge rates,a best thickness(0.5 mm) of cool plate is found. At last,the cooling system was optimized based on original simulation results,and the optimized cooling system has better temperature uniformity.

Key words: battery module;electro ⁃ thermal model;thermal management system;design and opti⁃ mization

引言锂离子电池作为电动汽车的主要动力源,具有高放电电压、高能量密度、高功率密度、无污染、无记忆效应、自放电率低等优点,近年来在电动汽车中被大量应用,并成为继镍氢电池之后的新一代可充电电池 。锂离子电池适宜的工作温度范

[] 1⁃3

围为25~40℃,电池模组温差不得超过5℃,超出适宜温度会导致其容量下降、放电效率降低、循环寿命缩短等不良后果,直接影响电动汽车的动力性、

收稿日期: 2018-02-24

基金项目:国家自然科学基金资助项目( 51762034)

经济性、安全性 ,因此,高效合理的电池热管理

[] 4⁃6

系统必不可少。

电池热管理系统主要分为空冷热管理系统、液冷热管理系统、相变材料热管理系统以及三者结合的热管理系统 。空冷热管理系统结构简

[] 7⁃9单,但是散热效率低;相变材料散热系统散热效果最好,但是对相变材料要求高且价格昂贵;液冷散热系统是目前主流的散热系统。MONDAL等

[] 10在建立电化学热耦合NTG模型的基础上研究了不同纳米流体对电池组冷却效果的影响,并且对比了不同冷却结构对电池组冷却效果的影响。BANDHAUER等 通过建立电化学热耦合模型[] 11

· ·

南昌大学机电工程学院,南昌, 330031

摘要:针对电池组放电过程各部位生热不均匀现象,研究了其生热机理,建立电池电-热耦合模型,得到电池单体电流密度及生热速率在电芯上的分布规律。基于该生热规律模拟电池模组在不同放电倍率下的温升,根据电池模组的热物性参数及冷却要求(电池模组温度控制在25~40 ℃,温差小于5 ℃)计算冷却水流速,并设计相对应的水冷结构。对比研究不同放电倍率、不同厚度导热板的电池模组仿真结果,得到最优导热板厚度( 0.5 mm)。最后根据仿真结果对水冷系统进行优化,进一步减小了电池模组的温差。

关键词:电池组;电-热耦合模型;热管理系统;设计与优化

中图分类号: TM912

DOI:10.3969/j.issn.1004⁃132X.2018.15.012 开放科学(资源服务)标识码(OSID) :

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