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

Author

Listed:
  • He, Tengfei
  • Mi, Hongfu
  • Wang, Wenhe
  • He, Yuanhua
  • Zhi, Maoyong
  • Lyu, Yongke
  • Cai, Qiong

Abstract

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.

Suggested Citation

  • He, Tengfei & Mi, Hongfu & Wang, Wenhe & He, Yuanhua & Zhi, Maoyong & Lyu, Yongke & Cai, Qiong, 2025. "A systematic investigation of thermal and electrochemical behaviour of a cylindrical lithium-ion battery during charge and discharge processes," Energy, Elsevier, vol. 334(C).
    • Handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225032323
    DOI: 10.1016/j.energy.2025.137590
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    References listed on IDEAS

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    1. He, Tengfei & Zhang, Teng & Wang, Zhirong & Cai, Qiong, 2022. "A comprehensive numerical study on electrochemical-thermal models of a cylindrical lithium-ion battery during discharge process," Applied Energy, Elsevier, vol. 313(C).
    2. Feng, Xuning & Lu, Languang & Ouyang, Minggao & Li, Jiangqiu & He, Xiangming, 2016. "A 3D thermal runaway propagation model for a large format lithium ion battery module," Energy, Elsevier, vol. 115(P1), pages 194-208.
    3. Mao, Ning & Zhang, Teng & Wang, Zhirong & Gadkari, Siddharth & Wang, Junling & He, Tengfei & Gao, Tianfeng & Cai, Qiong, 2023. "Revealing the thermal stability and component heat contribution ratio of overcharged lithium-ion batteries during thermal runaway," Energy, Elsevier, vol. 263(PD).
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