Lithium-ion batteries are increasingly used in the field of new energy vehicles. Thermal runaway is the biggest potential safety hazard. In order to achieve safer battery and battery design, it is necessary to fully understand thermal runaway. In this paper, the thermal abuse model of lithium-ion battery is established, and the accuracy of the model simulation is verified through experiments. The thermal runaway characteristics of the battery under the oven test and local heating conditions are compared and analyzed. The results show that under the condition of 200°C oven test in more than 10 000 seconds to thermal runaway, the local heating under the condition of the thermal runaway in more than 500 seconds, and the oven temperature distribution more uniform on the surface of the test under the condition of the battery, the temperature distribution is almost consistent when thermal runaway. According to the characteristics of local heating mode, the small heating area cannot occur thermal runaway, and found that in the process of thermal runaway battery anode and electrolyte reaction to generate heat is the main cause of thermal runaway battery. This result can be used to guide the effective prevention of thermal runaway of lithium-ion batteries and prevent spreading.

中文翻译：

---

锂离子电池烘箱试验与局部高温热失控特性对比分析

锂离子电池越来越多地应用于新能源汽车领域。热失控是最大的安全隐患。为了实现更安全的电池和电池设计，有必要充分了解热失控。本文建立了锂离子电池的热滥用模型，并通过实验验证了模型仿真的准确性。对比分析了烘箱测试和局部加热条件下电池的热失控特性。结果表明，在200℃烘箱测试10000秒以上热失控条件下，热失控500秒以上条件下的局部加热，烘箱温度在表面分布更均匀。电池条件下的测试，热失控时温度分布几乎一致。根据局部加热模式的特点，小加热面积不会发生热失控，发现热失控过程中电池正极与电解液反应产生热量是电池热失控的主要原因。该结果可用于指导有效防止锂离子电池热失控和防止扩散。