Lithium-ion batteries are widely used in electric power vehicles and other modern applications. Electrode structure stability and mechanical integrity are major concerns for lithium-ion safety and performance. To understand the meso-mechanism of electrode components triggered by electrode tensile failure, a 2-D discrete element method (DEM) with an additional bond model is proposed, representing a proper contact and bond model to capture the uniaxial tensile mechanics. Simulations can provide detailed meso information on the changes in the electrode structure and the mechanical performance of the binder. The numerical results were analysed and show to be in good agreement with the experimental data. The model improves the understanding of the failure behaviour of electrodes at the meso scale and constitutes a valuable physical and mechanical basis for the future development of safety design tools for lithium-ion batteries.

锂离子电池广泛用于电动汽车和其他现代应用中。电极结构的稳定性和机械完整性是锂离子安全性和性能的主要问题。为了理解由电极拉伸失效触发的电极组件的细观机理，提出了带有附加键模型的二维离散元方法（DEM），该方法代表了捕获单轴拉伸力学的适当接触和键模型。模拟可以提供有关电极结构变化和粘合剂机械性能的详细介观信息。对数值结果进行了分析，表明与实验数据吻合良好。