This work presents an experimental investigation of the failure mechanism of 18650 lithium-ion batteries subject to dynamic mechanical loads and the implications of severe damages on the safety function of the current interruptive device (CID), as current literature offers no insight in this topic. First, a conducted shock test series with loads beyond automotive standards showed no distinct impact on various modern cell types in impedance and computed tomography (CT) analysis, while older cell types exhibited signs of damage such as mandrel displacement and increase of ohmic resistance, as had already been reported in literature. A following investigation with acceleration measurements of drops of power tool battery modules revealed that accelerations in some applications can exceed even high load-level standards significantly. In a subsequent test series with axial drop tests in both orientations with various cell types, impact surfaces and states of charge (SOC), multiple cell types exhibited high ohmic failure without a thermal event. Computed Tomography (CT) and Post Mortem analysis revealed that, among various observable damage mechanisms, the predominant failure mechanism is contact loss in the CID region. Even severe mechanical damages, although influencing electrical and thermal behavior, showed no impact on the functionality of the CID in overcharge tests

这项工作对 18650 锂离子电池在动态机械负载下的失效机制以及严重损坏对电流中断装置 (CID) 的安全功能的影响进行了实验研究，因为目前的文献没有提供有关该主题的见解。首先，在负载超出汽车标准的情况下进行的一系列冲击测试表明，阻抗和计算机断层扫描 (CT) 分析对各种现代电池类型没有明显影响，而较旧的电池类型则表现出损坏迹象，例如心轴位移和欧姆电阻增加，如已经在文献中报道过。对电动工具电池模块滴落的加速度测量进行的后续调查显示，某些应用中的加速度甚至可以显着超过高负载水平标准。在随后的一系列测试中，在两个方向上使用各种电池类型、冲击表面和充电状态 (SOC) 进行轴向跌落测试，多种电池类型在没有热事件的情况下表现出高欧姆故障。计算机断层扫描 (CT) 和验尸分析表明，在各种可观察的损坏机制中，主要的失效机制是 CID 区域的接触损失。即使是严重的机械损坏，虽然会影响电气和热行为，但在过充电测试中对 CID 的功能没有影响 主要的失效机制是 CID 区域的接触损失。即使是严重的机械损坏，虽然会影响电气和热行为，但在过充电测试中对 CID 的功能没有影响 主要的失效机制是 CID 区域的接触损失。即使是严重的机械损坏，虽然会影响电气和热行为，但在过充电测试中对 CID 的功能没有影响