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Automotive Engineering ›› 2025, Vol. 47 ›› Issue (6): 1022-1036.doi: 10.19562/j.chinasae.qcgc.2025.06.002

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Research on Thermal Runaway Modeling and Safety Boundary of Li-ion Batteries Under Extreme Temperature Shock

Xiaoyu Li1,Shen Zhao1,Jun Tian2,Songli Zhang3,Yanli Zhu3()   

  1. 1.School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401
    2.China North Vehicle Research Institute,Beijing 100072
    3.Beijing Institute of Technology,State Key Laboratory of Explosion Science and Safety Protection,Beijing 100081
  • Received:2024-11-22 Revised:2025-01-06 Online:2025-06-25 Published:2025-06-20
  • Contact: Yanli Zhu E-mail:zhuyanli1999@bit.edu.cn

Abstract:

Thermal runaway is a key issue affecting the safety of lithium-ion batteries. Herein, the non-adiabatic environment external temperature impact test platform is established for studying the thermal runaway characteristics of the single battery and battery module of NCM523 batteries and LFP batteries, analyzing the combustion behaviors of different batteries and battery modules in addition to the thermal runaway propagation after forming a module. The three-dimensional conjugate heat transfer-thermal runaway coupling model is established to obtain the law of the thermal runaway triggered by extreme temperature shock under different state of charge and the distance from the heat source and explore boundary conditions for thermal runaway propagation of modules. The results show that reaction onset temperature for anode-electrolyte roughly declines as the SOC decreases, with lower heat generated by the side-reaction. When the distance from the heat source is greater than 150 cm, it is difficult to make the LFP battery thermal runaway in 400s. PMI foam is able to achieve millimetre-level thermal barrier. When its thickness is greater than 3.75mm or thermal conductivity is less than 0.03W/(m·K) , it can effectively inhibit the propagation of thermal runaway.

Key words: lithium-ion battery, thermal runaway, state of charge, thermal runaway propagation, numerical simulation