锂离子电池热失控气体燃烧对热失控传播影响的量化方法

为量化锂离子电池热失控过程产生热失控气体对热失控传播的影响，基于能量守恒方程和铜基电池量热法，提出了一种计算热失控气体燃烧对热失控传播贡献占比的方法。选取商用18650型电池，利用自主设计搭建的热失控气体释能测算实验平台获取计算所需参数。实验结果表明：第1节电池热失控气体燃烧释放的能量在第2节电池热失控所需能量中占比达到5.42%，使第2节电池自产热增加了42%，热失控时间提前了29%。研究结果有助于进一步探索热失控传播过程中的能量传递效率，为单元层级和系统层级的电池安全设计提供理论支持。

Quantitative method of influence of thermal runaway gas combustion on thermal runaway propagation of lithium-ion battery

In order to quantify the effect of thermal runaway gas produced in the thermal runaway process of lithium-ionbattery on thermal runaway propagation, based on the energy conservation equation and the equivalent substitution method, this paper presents a method to calculate the contribution of thermal runaway gas combustion to thermal runaway propagation. The self-designed experimental platform of thermal runaway gas energy release calculation was used to pick the commercial 18650 battery and collect the parameters required for the calculation. According to the experiment results, the energy released during the combustion of the first cell’s thermal runaway gas accounts for 5.42% of the energy needed by the second cell’s thermal runaway, resulting in a 42% increase in the second cell’s self-heat production and a 29% reduction in thermal runaway time. The research results are helpful to further explore the energy transfer efficiency in the process of runaway heat transfer, and provide theoretical support for cell level and system level battery safety design.