Journal
JOURNAL OF ENERGY STORAGE
Volume 45, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2021.103759
Keywords
Lithium-ion batteries; Exhausted gas; State of charge; Explosion limit
Categories
Funding
- Key Program of the Joint Fund for Civil Aviation Research [U2033204]
- National Natural Science Foundation of China [U2033204]
- Fundamental Research Funds for the Central Universities [3122018L011]
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This study investigated the composition and explosion limits of thermal runaway gases from lithium-ion batteries, finding a close relationship between the State of Charge (SOC) of the battery and the generation of thermal runaway gases, as well as their explosion limits. The 50% SOC battery displayed the lowest risk of combustion and explosion.
ABS TRACT The combustion and explosion of thermal runaway gases from lithium-ion batteries may accelerate the propagation of thermal runaway from lithium-ion batteries and pose a serious threat to surrounding people and property. Therefore, the research of thermal runaway gas composition and explosion limits of lithium-ion batteries is of great significance for the prevention and control of thermal runaway of lithium-ion batteries. In this paper, we use experiments combined with empirical formulas to investigate the composition of gases generated by the thermal runaway and the explosion limit of 18,650 lithium-ion batteries. The analysis of the thermal runaway gas components of lithium-ion batteries by using gas chromatography-mass spectrometry (GC-MS) shows that as the SOC increases, the number of thermal runaway gases increases. With the increase of SOC, the change of lower explosion limit (LEL) shows the same trend as that in alkanes content, which increases and then decreases; while the change of upper explosion limit (UEL) shows the same trend as that in unsaturated hydrocarbons content, which decreases and then increases. In addition, 50% SOC battery shows the lowest exhausted gas combustion explosion danger.
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