期刊
JOURNAL OF POWER SOURCES
卷 285, 期 -, 页码 80-89出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.03.035
关键词
Lithium-ion battery; Fire behavior; Lithium-iron phosphate; Full-scale burning; Heat release rate
资金
- National Natural Science Foundation of China [51176183]
- Shandong Provincial Natural Science Foundation, China [ZR2014EEQ036]
- Program for New Century Excellent Talents in University [NCET-12-0514]
- Opening Fund of State Key Laboratory of Fire Science of University of Science and Technology of China [HZ2013-KF03, HZ2015-KF14]
- China Postdoctoral Science Foundation [2014M 560592]
A full-scale burning test is conducted to evaluate the safety of large-size and high-energy 50 Ah lithium -iron phosphate/graphite battery pack, which is composed of five 10 Ah single cells. The complex fire hazards associated with the combustion process of the battery are presented. The battery combustion behavior can be summarized into the following stages: battery expansion, jet flame, stable combustion, a second cycle of a jet flame followed by stable combustion, a third cycle of a jet flame followed by stable combustion, abatement and extinguishment. The multiple jets of flame indicate serious consequences for the battery and pose a challenge for battery safety. The battery ignites when the battery temperature reaches approximately 175-180 degrees C. This critical temperature is related to an internal short circuit of the battery, which results from the melting of the separator. The maximum temperature of the flame can reach 1500 degrees C. The heat release rate (HRR) varies based on the oxygen generated by the battery and the Joule effect of the internal short circuit. The HRR and heat of combustion can reach 49.4 kW and 18,195.1 kJ, respectively. The state of charge of the battery has a significant effect on the maximum HRR, the overall heat generation and the mass loss of the battery. (C) 2015 Elsevier B.V. All rights reserved.
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