期刊
FIRE TECHNOLOGY
卷 56, 期 6, 页码 2491-2507出版社
SPRINGER
DOI: 10.1007/s10694-020-00976-0
关键词
Lithium-ion battery; Thermal runaway; Critical temperature; Propagation speed; 18650 battery
资金
- National Key R&D Program of China [2018YFB0104100]
Thermal-runaway propagation in battery systems can escalate the battery fire hazard and pose a severe threat to global users. In this work, the thermal-runaway propagation over 18650 cylindrical lithium-ion battery was tested in the linear-arranged module with a 3-mm gap. State of charge (SOCs) from 30% to 100%, ambient temperatures from 20 degrees C to 70 degrees C, and three tab-connection methods were investigated. Results indicate that the battery thermal-runaway propagation speed was about 0.35 +/- 0.15 #/min, which increased with SOC and ambient temperature. The critical surface temperature of thermal runaway ranged from 209 degrees C to 245 degrees C, which increased with ambient temperature while decreased with SOC. Compared to the open-circuit module, the flat tab connection could cause an external short circuit to accelerate the thermal-runaway propagation, and the non-flat tab connection was more likely to trigger an explosion. A heat transfer analysis was proposed to qualitatively explain the speed and limiting conditions of thermal-runaway propagation, as well as the influence of SOC, ambient temperature, and tab connection. This work reveals the thermal-runaway propagation characteristics under well-controlled environments, which could provide scientific guidelines to improve the safety of the battery module and reduce battery fire hazards.
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