In a special environment such as a high‐rate charge or discharge one, the positive and negative electrode materials of a lithium ion battery may undergo a chemical exothermic reaction with an electrolyte and a binder and release a large amount of heat to cause thermal runaway, resulting in harmful consequences. In this paper, high‐rate charging experiments of different types of 18650 Li‐ion battery packs were performed to study the behavior and influencing factors of Li‐ion battery packs when thermal runaway occurred. Automatic test equipment with battery comprehensive parameters was adopted, and a Li‐ion battery thermal runaway test device was designed and used to test a series of Li‐ion battery packs under high‐rate charging conditions. The series of tests were conducted under different conditions of different cell spacing, pick‐up point positions and connection modes. Results showed that under the above three different conditions, the initial time and the initial temperature of the thermal runaway of the Li‐ion battery packs, the maximum temperature of thermal runaway and the position where the first thermal runaway battery occurred showed some regular changes.

中文翻译：

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高速充电条件下锂离子电池组的热失控危险特性及影响因素

在诸如高倍率充电或放电之类的特殊环境中，锂离子电池的正极和负极材料可能会与电解质和粘合剂发生化学放热反应，并释放大量热量，从而导致热失控，造成有害后果。本文进行了不同类型的18650锂离子电池组的高速率充电实验，以研究发生热失控时锂离子电池组的行为和影响因素。采用具有电池综合参数的自动测试设备，设计了锂离子电池热失控测试设备，并用于在高速率充电条件下测试一系列锂离子电池组。该系列测试是在不同条件下进行的，不同的像元间距 拾取点位置和连接模式。结果表明，在以上三种不同条件下，锂离子电池组热失控的初始时间和初始温度，热失控的最高温度以及第一个热失控电池的发生位置均呈现规律性变化。