热处理对锂离子电池热失控特性的影响研究

为了探究外部高温对不同荷电状态锂离子电池热失控特性的影响，将三种荷电状态的18650 型锂离子电池分别热处理至80、100 ℃，在常温下静置24 h 后通过热流道加热线圈使其热失控并分析电池的温度、电压等特征参数。研究表明，同一热处理温度下，锂离子电池荷电状态越高其热失控现象越剧烈，热失控温度越高，电压下降时间越早。同一荷电状态下，热处理至80 ℃的锂离子电池热失控现象更剧烈，热失控温度更高，电压下降时间却更晚。试验结论可为锂离子电池的安全运输、存储及应用提供理论依据。

Research on the effect of heat treatment on thermal runaway characteristics of lithium-ion batteries

In order to explore the effect of external high temperature on the thermal runaway characteristics of lithium-ion batteries with different charged states,18650 lithium- ion batteries with three charged states were heated to 80 ℃ and 100 ℃ respectively. After standing at room temperature for 24 hours, the thermal runaway was made by hot runner heating coil, and the characteristic parameters such as temperature and voltage were analyzed. The results show that at the same heat treatment temperature, the higher the charge state of lithium- ion battery, the more severe the thermal runaway phenomenon, the higher the thermal runaway temperature, the earlier the voltage drop time. In the same charged state, the thermal runaway phenomenon of lithium- ion battery heat- treated to 80 ℃ is more severe, the thermal runaway temperature is higher, but the voltage drop time is later. The experimental results can provide a theoretical basis for the safe transportation, storage and application of lithium-ion batteries.