• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2023, Vol. 59 ›› Issue (22): 33-45.doi: 10.3901/JME.2023.22.033

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Research on the Impact of High-temperature Cyclic Aging on the Safety of Lithium-ion Batteries

ZHANG Guangxu1,2, WEI Xuezhe1,2, CHEN Siqi1,2, ZHU Jiangong1,2, DAI Haifeng1,2   

  1. 1. School of Automotive Studies, Tongji University, Shanghai 201804;
    2. Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804
  • Received:2022-12-02 Revised:2023-04-03 Online:2023-11-20 Published:2024-02-19

Abstract: High-temperature cyclic aging can cause battery degradation, influence battery thermal stability, and further affect the safety use of batteries. It is of great significance to clarify the evolution of thermal safety during high-temperature cyclic aging for lithium ion batteries. By investigating the degradation behavior, heat generation characteristics upon discharge, adiabatic thermal runaway characteristics, and overcharge characteristics during high-temperature cyclic aging, the thermal safety evolution is revealed, which can provide guidance for the safe utilization of lithium ion batteries. High-temperature cyclic aging causes battery degradation, such as capacity degradation and impedance increase. In the adiabatic discharge process, the entire temperature rise first decreases and then increases with aging. The dominant factor changes from capacity to temperature rise. High-temperature cyclic aging severely reduces the thermal stability of the anode and cathode, making the self-heating initial temperature and thermal runaway triggering temperature decrease severely. The battery thermal safety is reduced. The loss of active materials reduces the maximum temperature and the maximum temperature rise rate, which means that the thermal hazards decrease. Due to the impedance increase during high-temperature cyclic aging, the characteristic voltages increase upon overcharge. However, the overcharge thermal runaway time of aged cell is shortened, the thermal runaway triggering temperature is reduced, and the contribution rate of side reaction heat to thermal runaway triggering is reduced. The battery tolerance is reduced.

Key words: lithium-ion batteries, high-temperature cyclic aging, heat generation, thermal runaway, overcharge

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