Lithium-ion Full Battery Manufacturing Process Training--Coating

1.Coating Basics

Purpose：To uniformly coat a fluid slurry onto the surface of a metal foil, dry it, and produce a battery electrode

Principle:The coating roller rotates to carry the slurry, and the amount of slurry transferred         is adjusted by adjusting the gap between the blade and the roller. The relative rotation of         the back roller and the coating roller is used to transfer the slurry onto the substrate.         Subsequently, the solvent in the slurry is evaporated through drying and heating, causing         the solid matter to adhere to the substrate.

 

Note: Taking transfer coating as an example

 

2.Common Coating Methods

 

3.Coating Process

 

 

Note: The cathode slurry typically uses NMP as a solvent.

Therefore, a NMP recovery device is added to the drying system during the coating process

 

4.Coating Mechanism

Control Points：

(1)Liquid Level of Slurry in Hopper (Liquid Level Control)

(2)Temperature of Slurry During Coating Process (Constant Temperature)

(3) Blade Gap

(4)Coating Speed

(5)Speed Ratio Between Coating Roller and Back Roller