Lithium battery production process and coating process analysis

Lithium battery sheet making process 1. Sheet pressing: a) Confirm the model and the standard thickness of the positive and negative sheets of the model. b) The thickness and appearance of the highest-grade pole piece after pressing (NO.1 or NO.1 and NO.2), whether there is any deformation, blistering, material loss, sticking machine, and lamination. c) Strength inspection of pole piece. 2. Slicing: a) Knife edge specifications, large pole piece specifications (length and width), and appearance confirmation. b) The width of the divided pieces. c) Whether the separated small pieces have burrs, wrinkles, or cut obliquely, or drop material (positive). 3. Dividing and weighing slices: a) Whether there is any wrong division in weighing. b) Visual inspection: the size is out of tolerance. 4. Baking: a) Setting of oven temperature and time. b) N2, time effect of vacuuming (visual instrument) and time interval. Lithium battery coating process The generalized coating process of lithium battery includes: unwinding → splicing → pulling sheet → tension control → coating → drying → correction → tension control → correction → winding and other processes. The coating process is complex, and there are many factors that affect the coating effect, such as: the manufacturing accuracy of the coating equipment, the smoothness of the equipment operation, the dynamic tension control during the coating process, the air volume during the drying process, and the temperature control The curve will affect the coating effect, so it is extremely important to choose the appropriate coating process. Generally, the choice of coating method should be considered from the following aspects, including: the number of coating layers, the thickness of the wet coating, the rheological properties of the coating liquid, the required coating accuracy, the coating of the support or substrate, and the coating The speed of the cloth, etc. The coating method has developed from the original dip coating and extrusion to the most advanced double-sided simultaneous coating, all of which are to improve the coating quality and performance of the pole piece. There are some domestic companies with strong economic strength for reliable manufacturing performance. Lithium batteries, cost a lot of money to introduce expensive foreign pole piece coating machines. The production process of lithium batteries has a crucial influence on battery consistency. The quality of the production of the pole pieces is basically doomed to some performance of the battery, and the coating of the substrate is a very important part of the entire battery manufacturing process. American and Japanese coating machine manufacturers have developed double-sided simultaneous coating technology for single-layer coating machine energy efficiency and aluminum foil oxidation problems, which thoroughly dealt with the aluminum foil oxidation problem during coating, but the high price of double-sided simultaneous coating machines It is not acceptable for ordinary battery processing manufacturers. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.