Nowadays, laser cleaning has become the main means of battery surface treatment, and is widely used in the manufacture of poles, cell production and battery assembly of the three main power battery production process. Through the use of lasers, cleaning heads and control software, computer integrated control, greatly improving the level of battery manufacturing process.
Wafer Laser Cleaning
Positive and negative collectors need to clean the thin metal strip when coating electrode materials. Common positive electrode collector is aluminum foil, negative electrode collector is copper foil, in order to ensure the stability of the collector in the battery internal stability, the purity of the two are required to be more than 98%.
Traditional wet ethanol cleaning is easy to cause damage to other parts of the lithium battery, the use of laser cleaning of metal foil can not only improve the efficiency of the cleaning process, saving cleaning resources, and the establishment of real-time monitoring of the cleaning process data and quantitative determination of the cleaning results, can effectively improve the consistency of the batch production of the pole piece.
Laser cleaning before battery welding
In recent years, laser welding has become the standard for power battery production lines, and is widely used in the welding of power battery lugs, sealing nails, busbars, battery modules and so on. 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 from the weld joints can effectively improve welding quality and reduce costs.
Laser cleaning is applied to the sealing nail and adapter in the core section, the pole post of the bus piece in the module section, the blue film of single cell, the silicone gel of single cell, and the coating cleaning process of single cell, which effectively removes the dirt and dust on each end surface, prepares for the welding of the battery in advance, and reduces the defective products of welding.
Battery assembly process laser cleaning
In order to prevent lithium battery safety accidents, often the lithium battery cell external adhesive treatment, in order to play the role of insulation, to prevent the occurrence of short-circuit, as well as to protect the line, to prevent scratching.
△Cleaning of the oxide layer on the welded seams of the battery tray
Laser cleaning of CMT weld seams of battery tray, electrophoretic paint of battery pack upper cover, oxidized layer of sealant track of battery pack case, oxidized layer of protective base plate before welding, to improve the adhesion of adhesive sticker or adhesive coating, and no harmful pollutants will be produced after cleaning, and in the highly concerned about the environmental protection, this kind of green cleaning method will be more and more important.
