Study on the Homogeneity of Large-Size Blade Lithium-Ion Batteries Based on Thermoelectric Coupling Model Simulation

Fei Chen, Wenkuan Zhu, Xiangdong Kong, Yunfeng Huang, Yu Wang, Yuejiu Zheng () and Dongsheng Ren ()
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Fei Chen: College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Wenkuan Zhu: College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Xiangdong Kong: Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
Yunfeng Huang: College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Yu Wang: College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Yuejiu Zheng: College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Dongsheng Ren: State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Energies, 2022, vol. 15, issue 24, 1-19

Abstract: To improve the energy density of lithium-ion battery packs, lithium-ion batteries are gradually advancing towards large-size structures, which has become one of the dominant development trends in the battery industry. With large-size blade lithium-ion batteries as the research object, this paper develops a high-precision electro-thermal coupling model based on the relevant parameters obtained through basic performance experiments, explores the mechanism of battery inhomogeneity from a simulation perspective, and further proposes a design management method. First of all, the optimal intervals of capacity and temperature, as well as the characteristics of the inhomogeneity distribution for large-size cells, are determined by essential performance and inhomogeneity tests; subsequently, the electrochemical and thermal characteristics of the large-size battery are described precisely through a 3D thermoelectric coupling mechanism model, and the inhomogeneity of the temperature distribution is obtained through simulation; eventually, the optimized cell connection method and thermal management strategy are proposed based on the validated model. As indicated by the findings, the above solutions effectively ease the inhomogeneity of large-size cells and significantly boost the performance of large-size cells under different operating conditions.

Keywords: lithium-ion battery; inhomogeneity; blade battery; thermoelectric coupling model; structural optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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