Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (11): 4113-4123.doi: 10.19799/j.cnki.2095-4239.2024.0435

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

Non-destructive monitoring and evolutionary characterization of internal temperature in lithium-ion batteries

Xiuwu WANG1(), Jiangong ZHU1, Dengcheng LIU2, Wanqiang FENG2,3, Shuiping ZHAO3, Haonan LIU1, Haifeng DAI1, Xuezhe WEI1()   

  1. 1.School of Automotive Studies, Tongji University, Shanghai 330200, China
    2.Nanchang Automotive Institute of Intelligence & New Energy, Nanchang 202402, Jiangxi, China
    3.Nanchang Jiling New Energy Technology Co. , Ltd, Nanchang 330000, Jiangxi, China
  • Received:2024-05-16 Revised:2024-05-28 Online:2024-11-28 Published:2024-11-27
  • Contact: Xuezhe WEI E-mail:2010854@tongji.edu.cn;weixzh@tongji.edu.cn

Abstract:

Lithium-ion batteries, as electrochemical energy storage devices, involve complex multi-physical field coupling, making non-destructive monitoring of their internal state crucial for enhancing battery management capabilities. Due to the low thermal conductivity of cells and insufficient heat exchange between the battery and the external environment, temperature distribution within the cell is uneven during operation, resulting in significant temperature differences between the internal and external regions. This study employs the integrated functional electrode (IFE) concept, utilizing an in situ S-shaped fiber optic sensor to monitor the internal temperature distribution of the NCM523 pouch cell, capturing temperature evolution patterns before and after battery aging and identifying hotspot locations. Results confirm that embedding the fiber optic sensor does not impair the electrochemical performance of the cell during extended cycling, establishing the reliability of in situ temperature monitoring. Post-mortem analysis of the IFE after battery aging reveals its ability to decouple fiber optic signals, monitor temperature without adverse effects on electrochemical performance, resist corrosion, and enable distributed in situ temperature measurement. By analyzing temperature data, this study proposes using the rate of temperature rise during the constant-current discharge stage as a critical parameter for battery management. It highlights that the temperature evolution in the central region of the battery and around the positive electrode tab is crucial for effective battery monitoring and management.

Key words: lithium-ion battery, integrated functional electrode, operando temperature sensing, temperature distribution, temperature rise rate

CLC Number: