The manufacturing process of lithium-ion batteries is relatively complex. Key processes include the electrode fabrication (stirring and coating stage, front-end), cell assembly (winding and liquid injection stage, mid-end), and formation, packaging, and testing stage (back-end). The value (purchase amount) breakdown is approximately (35-40%):(30-35)%:(30-35)%. Differences mainly arise from different equipment suppliers and varying import/domestic ratios. While the overall process flow is consistent, the value breakdown may vary but generally conforms to this ratio.
The key equipment for the front-end lithium battery processing includes vacuum mixers, coating machines, and rolling mills; the mid-end processing includes die-cutting machines, winding machines, stacking machines, and liquid injection machines; and the back-end processing includes formation machines, capacity testing equipment, and automated process warehousing and logistics. In addition, battery pack processing also requires automated pack assembly equipment.
The processing flow of lithium-ion batteries varies from manufacturer to manufacturer, but it generally involves the following steps: material preparation, slurry preparation, coating, rolling, slitting, baking, winding into the casing, laser welding, baking, electrolyte injection, pre-charging, sealing, cleaning, aging, full inspection, warehousing, and shipping.
Objectively speaking, the lithium-ion battery manufacturing process can be divided into three main stages: electrode fabrication, cell fabrication, and battery packaging. Electrode fabrication is fundamental, cell fabrication is the core, and battery packaging directly affects the quality of the finished lithium-ion battery. The specific steps in the lithium-ion battery manufacturing process include positive electrode slurry drawing, negative electrode slurry drawing, positive electrode sheet fabrication, negative electrode sheet fabrication, steel casing assembly, electrolyte injection and testing, and packaging.
