Application of laser cleaning in lithium battery intelligent manufacturing

At present, laser cleaning has become the main means of battery surface treatment and is widely used in three main power battery production processes: pole piece manufacturing, battery cell manufacturing and battery assembly. By using lasers, cleaning heads and control software, computer integrated control, the battery manufacturing process level is greatly improved.

1 Pole piece laser cleaning
When the positive and negative current collectors are coated with electrode materials, the metal strips need to be cleaned. "The common positive electrode current collector is aluminum foil, and the purity of both is required to be above 98%. The negative electrode current collector is copper foil. In order to ensure the stability of the current collector inside the battery, the traditional wet ethanol cleaning is easy to damage other parts of the lithium battery. The use of laser cleaning metal can not only improve the efficiency of the cleaning process and save cleaning resources, but also establish real-time monitoring of the cleaning process data and quantitative judgment of the cleaning results, which can effectively improve the consistency of the batch production of the pole piece.

2 Laser cleaning before battery welding
In recent years, laser welding has become a standard feature of power battery production lines and has been widely used in welding of power battery pole ears, sealing nails, bus bars, battery modules, etc. A clean and uniform surface is the basic prerequisite for successful and durable welding and bonding. Therefore, before welding, surface treatment of each welding part to remove contaminants at the weld joint can effectively improve welding quality and reduce costs.