button cell battery cr1620

　　button cell battery cr1620 manufacturers introduce button cell battery cr1620 coating process technology

　　button cell battery cr1620 manufacturers introduce button cell battery cr1620 coating process technology. button cell battery cr1620 pole piece coating refers to a process in which a uniformly stirred slurry is evenly coated on the current collector and the organic solvent in the slurry is dried. The button cell battery cr1620 manufacturing process mainly includes pole piece manufacturing process, battery assembly process, as well as liquid injection, precharging, formation, aging process, etc. This article introduces the button cell battery cr1620 coating process technology from button cell battery cr1620 manufacturers.

　　button cell battery cr1620 manufacturers introduce button cell battery cr1620 coating process technology

　　The coating process is a process based on the study of the physical properties of fluids, which involves coating one or more layers of liquid on a substrate. The substrate is usually a flexible film or lining paper, and then the applied liquid coating passes through Oven drying or curing methods form a layer of film with special functions. The coating methods for button cell battery cr1620 pole pieces currently include comma roller transfer coating and slit extrusion coating.

　　Several coating methods for lithium batteries

　　①Blade coating

　　The foil substrate passes through the coating roller and is in direct contact with the slurry tank. Excessive slurry is applied to the foil substrate. When the substrate passes between the coating roller and the scraper, the gap between the scraper and the substrate determines the coating layer thickness, while scraping off the excess slurry and reflowing it, thereby forming a uniform coating on the surface of the substrate. Scraper type Main comma scraper.

　　②Slit extrusion coating

　　As a precision wet coating technology, the working principle is that the coating liquid is extruded and sprayed along the gaps of the coating die under a certain pressure and flow rate, and then transferred to the substrate. Compared with other coating methods, it has many advantages, such as fast coating speed, high precision, and uniform wet thickness; the coating system is closed to prevent contaminants from entering during the coating process, and the slurry utilization rate is high and the slurry can be maintained It has stable properties and can be coated with multiple layers at the same time.

　　Whether the button cell battery cr1620 coating process can accurately use the best coating and drying processes during the design process and balance the relationship between the two will ultimately affect the overall technical performance of the coating. In the coating of pole pieces, common problems include raw material contamination, unstable coating process, irregular operations, incorrect drying program settings, etc., and these problems will cause more or less defects in the pole pieces.

　　Pole piece coating is of great significance to lithium batteries, which is mainly reflected in the following points:

　　1. It is of great significance to the capacity of finished lithium batteries. During the coating process, if the thickness of the positive and negative electrode slurry coatings at the front, middle and rear sections of the pole pieces are inconsistent, it will easily cause the battery capacity to be too low or too high, and it will be easier to form lithium during the battery cycle, affecting the battery. life.

　　2. It is of great significance to the safety of lithium batteries. Before coating, 5S work must be done to ensure that no particles, debris, dust, etc. are mixed into the pole pieces during the coating process. If debris is mixed in, it will cause a micro short circuit inside the battery, and in severe cases, the battery may catch fire and explode.

　　3. It is of great significance to the performance consistency of lithium batteries. What is taboo for battery manufacturers is that there are large differences in capacity and cycle life among a batch of batteries, so during the pole piece coating process, it is necessary to ensure that the parameters of the front and rear pole pieces are consistent.

　　4. It is of great significance to the life of lithium batteries. The large difference between before and after slurry coating, dust mixed into the pole pieces, uneven thickness of the left and right pole pieces, etc. are all related to the electrochemical performance of the battery.

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