With the development of the new energy industry, battery life and rapid charge-discharge capacity have attracted much attention. At the same time, the high temperature inside the cell during high-rate charging and discharging may increase the probability of the battery thermal runaway. This paper studied the thermal runaway reaction of Li-ion batteries under different state of charge (SOC) and charge rates using a self-made experimental platform. The experimental phenomena and the changes in the temperature field were recorded. The key parameters, such as trigger temperature (T1, Lithium battery back thermal runaway triggers temperature), maximum temperature (Tmax),voltage, and mass loss (ML) of thermal runaway, were measured. The morphology changes of electrode materials, the battery remains, and the dynamics of thermal runaway reaction after high rate charge and discharge were further analyzed. The results show that for the 4 C-100 % battery, the T1 and Ea are reduced by 22.6 ℃ and 82.2 %, and the Tmax and maximum mass loss rate (MLRmax) are increased by 218.14 ℃ and five times, compared with the 1 C-50 % battery. With the increase of charge-discharge rate, the thermal stability of the battery decreases, and the gravity degree of accident increases.

中文翻译：

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高倍率充放电对锂离子电池热失控行为的影响研究


随着新能源行业的发展，电池寿命和快速充放电能力备受关注。同时，高速充放电时电池内部的高温可能会增加电池热失控的可能性。本文使用自制的实验平台研究了锂离子电池在不同充电状态 （SOC） 和充电速率下的热失控反应。记录了实验现象和温度场的变化。测量了触发温度 （T1、锂电池后热失控触发温度） 、最高温度 （Tmax） 、电压和热失控质量损失 （ML） 等关键参数。进一步分析了电极材料、电池残留物的形貌变化以及高倍率充放电后热失控反应的动力学。结果表明，对于 4 C-100 % 电池，与 1 C-50 % 电池相比，T1 和 Ea 降低了 22.6 °C 和 82.2 %，Tmax 和最大质量损失率 （MLRmax） 增加了 218.14 °C，是 5 倍。随着充放电倍率的增加，电池的热稳定性降低，事故的重力程度增加。