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author:

Huang, Z. (Huang, Z..) [1] | Duan, Q. (Duan, Q..) [2] | Li, J. (Li, J..) [3] | Yang, F. (Yang, F..) [4] | Sun, J. (Sun, J..) [5] | Wang, Q. (Wang, Q..) [6]

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Scopus

Abstract:

Thermal runaway propagation (TRP) inside lithium iron phosphate (LFP) batteries is an important part of TRP process of the module, but it has not been known clearly. This work experimentally and numerically investigated the overheat-induced thermal runaway (TR) characteristics of 243 Ah LFP battery and the influence mechanism of heating power on TRP within the battery. A series of TR experiments under 400, 700 and 1000 W heating power were conducted. The relationship between peak jet velocity and internal average TRP velocity (v_TR) was revealed for the first time. Results show safety venting and TR time decreases with increasing heating power, while the internal TRP time prolongs. Batteries with faster internal TRP velocity tend to own higher peak jet velocity. The relationship between v_TR and heating power is fitted as y=0.2421e−x/466.8843+0.2351 based on simulation result. v_TR almost decreases linearly with heating power in the range of 200–1000 W, and then enters a plateau-like descending phase. In critical TR state, the width of TR region widens as heating power increases. The acceleration of v_TR induced by low heating power is mainly attributed to a better pre-heating effect in non-TR region. This work can provide important guidance for the safety design of LIB batteries. © 2024

Keyword:

Jet velocity Lithium ion battery safety Thermal runaway Thermal runaway propagation

Community:

  • [ 1 ] [Huang Z.]College of Environment and Safety Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 2 ] [Duan Q.]State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, China
  • [ 3 ] [Li J.]China Academy of Safety Science and Technology, Beijing, 100012, China
  • [ 4 ] [Yang F.]College of Environment and Safety Engineering, Fuzhou University, Fuzhou, 350108, China
  • [ 5 ] [Sun J.]State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, China
  • [ 6 ] [Wang Q.]State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, China

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Source :

Journal of Energy Storage

ISSN: 2352-152X

Year: 2025

Volume: 109

8 . 9 0 0

JCR@2023

CAS Journal Grade:3

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ESI Highly Cited Papers on the List: 0 Unfold All

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Chinese Cited Count:

30 Days PV: 2

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