When lithium-ion batteries (LIBs) are located at high altitude and low pressure,the characteristics of thermal runaway (TR) and its propagation are different,such as time to TR, the toxicity of TR gases, TR propagation time, mass loss rate, etc. In this article, the author summarized a series of relevant literatures and proposed an instrument that can be used to analyse the TR behavior at different pressure. It is found that: with the decrease of ambient pressure, the TR trigger time becomes longer and the maximum surface temperature decrease. Moreover, the gas released by TR becomes more toxic as the environmental pressure decreases. Beside, the average propagation time between adjacent LIBs is not much difference when the environmental pressure decreases, and when the 18,650 battery module is distributed in a cylindrical shape, the thermal runaway propagation path is basically unchanged as the environmental pressure decreases. This work details TR and its propagation feature under different pressure, and can provide the guidelines for the Air transportation of LIBs.

中文翻译：

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锂离子电池低压热失控及其传播研究

当锂离子电池（LIBs）位于高海拔和低气压时，热失控（TR）的特性及其传播是不同的，如达到TR的时间、TR气体的毒性、TR传播时间、质量损失率在本文中，作者总结了一系列相关文献，并提出了一种可用于分析不同压力下TR行为的仪器。发现：随着环境压力的降低，TR触发时间变长，最高表面温度降低。此外，随着环境压力的降低，TR 释放的气体变得更加有毒。此外，当环境压力降低时，相邻LIB之间的平均传播时间相差不大，当18650电池模块呈圆柱形分布时，随着环境压力的降低，热失控传播路径基本不变。这项工作详细介绍了 TR 及其在不同压力下的传播特征，可为 LIB 的航空运输提供指导。