Lithium battery coating is a core process in cell manufacturing. It refers to the key procedure of uniformly coating positive and negative electrode slurries on the surface of current collectors (aluminum foil/copper foil), which forms electrode pole pieces after drying and calendering, and directly affects the battery's energy density, cycle life and safety.

The core process flow is divided into three steps: first, slurry preparation, where active materials, conductive agents, binders and other components are mixed and dispersed in proportion to ensure the slurry is uniform and stable; second, coating operation, where the slurry is precisely coated on the current collector through slot die extrusion, comma blade and other coating methods, with strict control over the uniformity of coating thickness and areal density; third, drying and calendering, where the coated pole pieces are dried with hot air or infrared rays to remove solvents, and then calendered to increase energy density and ensure the flatness of the pole pieces.

This process has extremely high precision requirements: the coating thickness tolerance must be controlled within ±2% and the areal density deviation ≤3%, to avoid defects such as missing coating, offset coating and air bubbles. An efficient and stable coating process is the key to ensuring the consistency and reliability of lithium batteries, and also the core support for the large-scale intelligent production of the lithium battery industry.