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Acta Aeronautica et Astronautica Sinica ›› 2023, Vol. 44 ›› Issue (23): 428529-428529.doi: 10.7527/S1000-6893.2023.28529

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Insitu explosion limit of thermal runaway gas explosion in cyclic aging lithium⁃ion batteries: Experimental analysis

Juan YANG1,2(), Jianghao NIU3, Qingsong ZHANG3   

  1. 1.Engineering Techniques Training Center,Civil Aviation University of China,Tianjin 300300,China
    2.Key Laboratory of Technology and Equipment of Tianjin Urban Air Transportation System,Civil Aviation University of China,Tianjin 300300,China
    3.Key Laboratory of Civil Aviation Thermal Hazards Prevention and Emergency Response,Civil Aviation University of China,Tianjin 300300,China
  • Received:2023-02-06 Revised:2023-03-03 Accepted:2023-03-28 Online:2023-12-15 Published:2023-03-31
  • Contact: Juan YANG E-mail:haishi_yj11@126.com
  • Supported by:
    Key Support Project of Civil Aviation Joint Fund of National Natural Science Foundation of China(U2033204);Open Fund of Key Laboratory of Technology and Equipment of Tianjin Urban Air Transportation System(TJKL-UAM-202302);Fundamental Research Funds for the Central Universities(3122022PY11)

Abstract:

To ensure the safety status of aging batteries under control, it is important to understand the thermal hazard of aging batteries. In this work, a non-destructive method based on Computed Tomography (CT) combined with in-situ detection of thermal runaway gas hazard was developed to analyze the thermal runaway gas explosion limit and explosion hazard of 18650 Li-ion batteries with different aging levels. The experimental results show that, compared with the unaged battery, the amount of heat required for aging batteries to achieve thermal runaway under thermal abuse is reduced. As the aging level increases, the internal laminar deformation of the aged battery increases and the explosion range tends to converge, reaching a maximum value when the battery undergoes 120 cycles of aging. The thermal runaway gas of the unaged battery exhibited the highest detonation temperature of 203.4 °C and the highest detonation pressure of 0.458 5 MPa, while the detonation risk of the thermal runaway gas of the aged battery was significantly lower. Although the detonation risk of the thermal runaway gas rebounded slightly with increasing ageing, it was still much lower than that of the unaged battery. The results demonstrate the feasibility of combining CT non-destructive testing with in-situ detection of thermal runaway gas hazard, and provide a theoretical basis for the database construction of the evolution mechanism of the lithium battery hazard level, as well as its detection and early warning.

Key words: lithium-ion battery, thermal runaway, nondestructive testing, gas explosion limit, cyclic aging

CLC Number: