Thermal runaway difference between fresh and retired lithium iron phosphate batteries under overheating

Cong Jie Wang, Shu Ping Wang, Fei Gao, Chang Hao Li, Yan Li Zhu*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

Safety is an important factor restricting the cascade utilization of lithium-ion batteries (LIBs). In this paper, the safety characteristics of fresh and retired lithium iron phosphate batteries are investigated by means of a heating-triggered thermal runaway (TR). The results show that under the heating condition of 200 W, the internal short circuit (ISC) can directly cause the TR of a new battery and lead to an explosion with an overpressure of 98.9 kPa. However, there is still a buffer time of 13.1-22.3 min between the ISC and TR for the retired battery with states of health (SOHs) of 80% - 60%, and the retired battery cannot explode. The large-scale ISC onset time, TR onset time, and TR onset temperature of the 70% SOH battery are 27.4 min, 40.5 min, and 179.9 °C, respectively, which are the smallest among retired batteries, indicating that the 70% SOH battery may be more likely to trigger TR. The findings can provide guidance for the safe application of retired batteries.

Original languageEnglish
Article number012003
JournalJournal of Physics: Conference Series
Volume2488
Issue number1
DOIs
Publication statusPublished - 2023
Event2023 2nd International Conference on Green Energy and Power Systems, ICGEPS 2023 - Changsha, Virtual, China
Duration: 6 Jan 20238 Jan 2023

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