振动环境对锂离子电池热失控危险性的影响

基于民航运输锂离子电池过程中所引发的热失控安全问题，以及运输环境存在颠簸。利用自主搭建的实验平台，以21700型单体锂离子电池为研究对象，通过分析锂离子电池在振动环境中开路电压（Open Circuit Voltage，OCV）与内阻变化以及热失控过程中火焰温度与质量损失的变化情况，研究振动环境对锂离子电池性能及热失控危险性的影响。实验结果表明：在振动条件下锂离子电池的OCV基本保持稳定，而内阻值会增加16.7%；相对于空白实验，经过振动处理后锂离子电池发生热失控危险性减弱。直观表现在火焰温度峰值降低9.69%，质量损失减少13.54%；同时利用电压容量微分曲线（dV/dQ）深入分析振动条件对锂离子电池的影响机理。本研究可为提高锂离子电池性能一致性提供理论参考。

Research on the Influence of Vibration Environment on Thermal Runaway Risk of Lithium-ion Battery

Based on the civil aviation transportation safety problem caused by thermal runaway of lithium-ion battery, and with turbulence during transportation, an experimental platform was designed independently, the 21700-type ternary lithium-ion battery was examined to explore the variations of open circuit voltage (OCV) and internal resistance, and the changes in flame temperature and mass loss during thermal runaway process, to investigate the impact of vibration environment on the performance of lithium-ion battery and the hazard of thermal runaway. The research results show that the OCV of the lithium-ion battery remains basically stable under vibration conditions, while the internal resistance increases by 16.7%; compared with the blank experiment, the risk of thermal runaway of the lithium-ion battery is reduced after vibration. The peak flame temperature reduced by 9.69% and the mass loss of lithium-ion battery dropped 13.54%; at the same time, the voltage capacity differential curve (dV/dQ) was used to in-depth analyze the influence mechanism of vibration conditions on lithium-ion battery. This study can provide theoretical reference for improving the consistency of lithium-ion battery performance.