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

Abstract

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 generation 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 optimization

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

CLC Number:

TM912

JIANG Shuisheng, HE Zhijian, WEN Hua. Design and Optimization of Thermal Management Systems for Lithium-ion Battery Module Based on Electro-thermal Model[J]. China Mechanical Engineering.

姜水生, 何志坚, 文华. [动力电池]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[J]. 中国机械工程.

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