This study presents a mathematical model and experimental verification of factors influencing thermal runaway propagation of NCM811/C lithium-ion battery module after fast charging operation. The key factors considered for the thermal runaway propagation include charging C-rate, battery spacing, triggering temperature, speed, and interval of the thermal runaway propagation. The analysis of the 3D model shows that increasing the spacing and triggering temperature of the battery will reduce the risk of thermal runaway propagation of the battery module and change the order of thermal runaway propagation. Further, the thermal runaway propagation speed increases gradually with the propagation process; however, it is inhibited by increasing triggering temperature and battery spacing and the decrease of charging C-rate. These observations play a critical role in the lithium-ion battery pack design.

本研究提出了影响NCM811/C锂离子电池模块快速充电运行后热失控传播因素的数学模型和实验验证。考虑热失控传播的关键因素包括充电 C 速率、电池间距、触发温度、速度和热失控传播的间隔。3D模型分析表明，增加电池间距和触发温度会降低电池模块热失控传播的风险，改变热失控传播的顺序。此外，热失控传播速度随着传播过程逐渐增加；但是，它会受到触发温度和电池间距的增加以及充电 C-rate 的降低的抑制。