Battery explosion incidents hinder the development and application of Li-ion batteries. This paper describes the use of nondestructive computed tomography (CT) to analyze cylindrical Li-ion battery samples that underwent thermal runaway and exploded. Unlike destructive analysis methods, which can lead to a loss of battery structural information, CT scan allows direct observation of a battery’s internal structure without disassembly. In this study, two case studies of 20700 and 18650 batteries show that sidewall and bottom case rupture was caused by blockage of the battery vent region, which prevented the release of the generated gas. This work demonstrates the ability of CT for post-mortem incident analysis and the limitations of current vent design, and also gives insight to a safety issue with some cylindrical batteries.

中文翻译：

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锂离子电池外壳破裂的计算机断层扫描分析

电池爆炸事件阻碍了锂离子电池的发展和应用。本文介绍了使用无损计算机断层扫描 (CT) 来分析经历热失控和爆炸的圆柱形锂离子电池样品。与可能导致电池结构信息丢失的破坏性分析方法不同，CT 扫描无需拆卸即可直接观察电池的内部结构。在这项研究中，20700 和 18650 电池的两个案例研究表明，侧壁和底壳破裂是由于电池通风区域堵塞导致产生的气体无法释放。这项工作证明了 CT 进行事后事故分析的能力和当前通风口设计的局限性，还提供了一些圆柱形电池的安全问题的洞察力。