With the increase in the specific energy of lithium-ion batteries (LIBs), fire accidents occur more frequently; however, the effective and clean suppression of LIB fires remains a challenge. In the present work, the efficiency of dodecafluoro-2-methylpentan-3-one (CFO) in suppressing high energy density (HED) ternary LIB fires is experimentally investigated. It is found that CFO can efficiently extinguish the HED battery and its module fire. As the flow rate increases, the extinguishment time decreases and the peak temperature decreases, but the cooling efficiency for the long-term process is reduced. When the CFO spray can completely cover the thermal runaway (TR) area, its extinguishing and cooling effect is the best. For the HED module, the application of CFO effectively increases the TR trigger temperature, reduces the TR peak temperature, and decreases heat production. The application of water mist enhances the cooling of extinguished LIBs, the combination of CFO and water mist extends the TR propagation time of the fully charged LIB module to 1.4 times that without suppression, and the total TR heat production is reduced by 1423.1 kJ. These results provide guidance for the design of inhibitor volume fractions for HED LIB fires.

中文翻译：

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十二氟-2-甲基戊-3-酮抑制NCM 811锂离子电池火灾的效率


随着锂离子电池（LIB）比能量的增加，火灾事故发生更加频繁；然而，有效、干净地扑灭锂离子电池火灾仍然是一个挑战。在目前的工作中，我们对十二氟-2-甲基戊-3-酮（CFO）抑制高能量密度（HED）三元锂离子电池火灾的效率进行了实验研究。结果发现，CFO能够有效扑灭HED电池及其模块的火灾。随着流量的增加，熄灭时间减少，峰值温度降低，但长期过程的冷却效率降低。当CFO喷雾能够完全覆盖热失控（TR）区域时，其灭火和冷却效果最佳。对于HED模块来说，CFO的应用有效提高了TR触发温度，降低了TR峰值温度，减少了发热量。水雾的应用增强了熄灭锂离子电池的冷却，CFO和水雾的结合将充满电的锂离子电池模块的TR传播时间延长至无抑制时的1.4倍，总TR产热量减少了1423.1kJ。这些结果为 HED LIB 火灾抑制剂体积分数的设计提供了指导。