With the development of modern technology and economy,environmental protection and sustainable development have become the focus of global attention.The promotion and development of electric vehicles(EVs)have bright prospects.However,many challenges need to be faced seriously.Under different operating conditions,various safety problems of electric vehicles emerge one after another,especially the hidden danger of battery overheating which threatens the performance of electric vehicles.This paper aims to design and optimize a new indirect liquid cooling system for cylindrical lithium-ion batteries.Various design schemes for different cooling channel structures and cool-ing liquid inlet directions are proposed,and the corresponding solid-fluid coupling model is established.COMSOL Multiphysics simulation software is adopted to simulate and analyze the cooling systems.An approximate model is constructed using the Kriging method,which is considered to optimize the battery cooling system and improve the optimization results.Sensitivity parameter analysis and the optimization design of system structure are performed through a set of influencing factors in the battery thermal management.The results indicate that the method used in this paper can effectively reduce the maximum core temperature and balance the temperature differences of the battery pack.Compared with the original design,the optimized design,which is based on the non-dominated sorting genetic algorithm(NSGA-Ⅱ),has an excellent ability in the optimized thermal management system to dissipate ther-mal energy and keep the overall cooling uniformity of the battery and thermal management system.Furthermore,the optimized system can also prevent thermal runaway propagation under thermal abuse conditions.In summary,this research can provide some practical suggestions and ideas for the engineering and production applications and structural optimization design carried by electric vehicles.

Yasong Sun;Ruihuai Bai;Jing Ma

School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China;Center of Computational Physics and Energy Science,Yangtze River Delta Research Institute of NPU,Northwestern Polytechnical University,Taicang 215400,China;School of Automobile,Chang'an Univer-sity,Xi'an 710064,China

中国机械工程学报

[1]Yasong Sun;Ruihuai Bai;Jing Ma-.Development and Analysis of a New Cylindrical Lithium-Ion Battery Thermal Management System)[J].中国机械工程学报,2022(04):113-127

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