A systematic investigation of thermal and electrochemical behaviour of a cylindrical lithium-ion battery during charge and discharge processes

被引：0

作者：

He, Tengfei ^{[1
]}

Mi, Hongfu ^{[1
]}

Wang, Wenhe ^{[1
]}

He, Yuanhua ^{[2
]}

Zhi, Maoyong ^{[2
]}

Lyu, Yongke ^{[1
]}

Cai, Qiong ^{[3
]}

机构：

[1] Chongqing Key Laboratory for Oil and Gas Production Safety and Risk Control, College of Safety Science and Engineering, Chongqing University of Science and Technology, Chongqing

[2] Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province, College of Civil Aviation Safety Engineering, Civil Aviation Flight University of China, Sichuan, Guanghan

[3] School of Chemistry and Chemical Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford

来源：

Energy | 2025年 / 334卷

关键词：

Charge and discharge processes; Electrochemical-thermal model; Lithium-ion battery; Non-uniformity;

D O I：

10.1016/j.energy.2025.137590

中图分类号：

学科分类号：

摘要：

Understanding the thermal and electrochemical behaviour of lithium-ion batteries (LIBs) under different operating conditions is essential for enhancing their performance and safety. In this study, an electrochemical-thermal model is developed for an 18650-type NCM523/graphite LIB and validated through experiments at various C-rates and ambient temperatures. The model is then employed to analyse heat generation characteristics, electrochemical non-uniformity, and the differences between charging and discharging under varying C-rates, environmental temperatures, and effective heat transfer coefficients. The results indicate that ohmic heat is the primary contributor to total heat generation, while the proportions of polarization and reversible heat decrease with increasing charge-discharge rates. Electrochemical reaction non-uniformity intensifies at higher rates, with the negative electrode exhibiting greater non-uniformity during charging than discharging. Furthermore, local current density distributions reveal the propagation patterns of electrochemical reactions within the electrodes. At the end of charging, lithium ions deintercalate from the region near the separator in the negative electrode and migrate deeper into the electrode. These findings provide valuable insights for optimizing battery thermal management, improving fast-charging capabilities, and enhancing battery safety and lifespan. © 2025 Elsevier Ltd

引用

共 35 条

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