Numerical Simulation Analysis of Hot Roller Pressing for NCM622 Cathode Electrode Sheet Based on Discrete Element Method

This study establishes a microscopic physical model of the NCM622 cathode electrode sheet based on the discrete element method (DEM). Through numerical simulation, the effects of roller speed, heat source temperature, and electrode material composition ratio on the thermal conduction behavior during the hot roller pressing process are quantitatively analyzed. The influence of the binder on the heat transfer of the electrode sheet is also taken into account. The simulation results indicate that for the NCM622 cathode electrode sheet, under a heat source temperature of 363 K, the roller speed should not exceed 10 m/min. Increasing the heat source temperature significantly accelerates the heating rate: at a roller speed of 15 m/min, for every 5 K increase in heat source temperature, the temperature at the coating‐current collector interface region rises by approximately 4 K. During the hot rolling process, electrode sheet with different material ratios exhibit no significant differences in temperature variation.