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Investigation of external heating-induced failure propagation behaviors in large-size cell modules with different phase change materials

机译：具有不同相变材料的大型电池模块中外部加热诱导的故障传播行为的研究

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摘要

The effect of phase change material (PCM) on thermal runaway (TR) and failure propagation in cell modules is investigated. Two PCMs, paraffin (PPCM) and graphene-enhanced hybrid (GHPCM) are considered. Each module is composed of three fully charged 50 Ah LiNi_xCo_yMn_(1-x-y)O_2/graphite cells isolated by air or PCM. The onset TR times of cell 1 are around 812, 801, and 942 s in modules without PCM, with PPCM and with GHPCM, respectively. The propagation time from cell 1 (cell 2) to cell 2 (cell 3) is reduced (delayed) from 638 s (168 s) in modules without PCM to 394 s (178 s) in GHPCM modules and 536 s (493 s) in PPCM modules. The PPCM module accompanied by a considerable amount of gas can relieve TR propagation because of less heat feedback from the flame, while the GHPCM module is prone to facilitating propagation due to strong heat transfer between adjacent cells. The module without PCM may delay TR propagation owing to limited heat transfer through contact walls. Compared to modules without PCM and with PPCM, the GHPCM module presents a higher maximum surface temperature (885 °C) and more heat release (7614 kJ). Finally, residue and physical damage are also examined.
机译：研究了相变材料（PCM）对热失控（TR）和细胞模块中的故障传播的影响。考虑两种PCM，石蜡（PPCM）和石墨烯增强的杂交（GHPCM）。每个模块由空气或PCM隔离的三个完全充电的50 AH Lini_xco_ymn_（1-x-y）O_2 /石墨单元组成。细胞1的发病Tr次数在没有PCM的模块中约为812,801和942秒，分别具有PPCM和GHPCM。来自小区1（小区2）到小区2（单元3）的传播时间从638 s（168 s）中的模块中的（延迟）在没有PCM到394s（178s）的模块中，在GHPCM模块中，536s（493s）在PPCM模块中。由于来自火焰的热量较小，PPCM模块伴随着大量气体可以释放TR传播，而GHPCM模块易于促进由于相邻电池之间的强传热而促进传播。由于通过接触壁的热传递有限，没有PCM的模块可能会延迟TR传播。与没有PCM的模块和PPCM相比，GHPCM模块具有更高的最大表面温度（885°C）和更多的热释放（7614 kJ）。最后，还检查了残留物和物理损伤。

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