期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 182, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2021.121928
关键词
Energy storage; Lithium-ion battery; Thermal model; Thermal runaway; Thermal runaway propagation; Thermal runaway front
资金
- Ministry of Science and Technology of China [2019YFE0100200]
- National Natural Science Foundation of China [52076121, 51706117]
Research has been conducted on the thermal runaway propagation behaviors of long, large-format lithium-ion batteries, revealing that the average velocity of the thermal runaway front is approximately 24.14 mm/s, driven by the temperature gradient. The characteristics of the thermal runaway front have been investigated through experiments and simulations, showing a correlation between the velocity of the thermal runaway front and the battery's thermophysical properties.
Long, large-format lithium-ion batteries have become prominent in recent years in high-power applica-tion scenarios, such as in electrochemical energy storage stations, electric vehicles, and electric ships. In these batteries, failure is always initiated from a local point and then propagates to the full cell, re-quiring countermeasures to quench the in-cell thermal runaway propagation. This study investigates the thermal runaway propagation behaviors of long, large-format lithium-ion batteries. A thermal runaway front exists during the propagation of thermal runaway; it separates the failure zone and normal zone and carries significant information regarding the thermal runaway reactions. The characteristics of the thermal runaway front are investigated through experiments and simulations. The thermal runaway front moves forward with an average velocity of approximately 24.14 mm.s(-1), driven by the large temperature gradient between the failure and intact zones. The velocity of the thermal runaway front is correlated with the thermophysical properties of the battery. A modeling analysis indicates that the velocity of the thermal runaway front in propagation has a square root correlation with the thermal conductivity and heat generation rate. This square root correlation links the failure process and the thermophysical prop-erties of the battery and can contribute to the future safety design of large-format batteries. (c) 2021 Elsevier Ltd. All rights reserved.
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