Explain in detail the production technology of liquid lithium-ion batteries

Lithium-ion battery manufacturers analyze the production technology of liquid lithium-ion batteries. The manufacturing process of lithium-ion batteries can be said to be very strict. The production process varies with different battery types. The production process of liquid lithium-ion batteries is shown in the following figure: 1. The active materials currently used in plate production are LiCoO2LiNiO2, LiMn2O4, etc., active materials, conductive agents (such as graphite, acetylene black), soluble in N-methylpyrrolidone (NMP) mixed adhesive (PVDF) solutions, After mixing uniformly at high speed, the slurry material is uniformly coated on the aluminum foil on both sides, the coating thickness is 15-20 microns, the organic dispersant is dried by nitrogen flow, and then the hydraulic press molding technology is used, and then cut into the predetermined size of the active board. Negative active materials are mainly carbon materials, including MCMB (Medium Phase Carbon Bead), natural graphite, petroleum coke, pitch-based carbon fiber and so on. The adhesive is PVDF, CMC or SBR latex, and the solvent is NMP. Mix carbon or graphite with about 10% of the binder (such as PVDF) to make a paste, evenly spread it on both sides of the copper foil, dry it, roll it to 25 meters, and cut it into a negative plate of the specified size as required. Since lithium ion batteries have strict requirements on the ratio of positive and negative materials, the preparation and coating process of the slurry is very important, and its precision and accuracy must be strictly controlled. The pretreatment of battery raw materials and the stirring of electrode paste are the first steps in the production of lithium-ion battery manufacturers. Battery active materials and auxiliary materials are required to be highly dispersed in organic solvents to form a uniform polymer paste with high viscosity, which can be used for electrode coatings. Slurry wet coating is a viscous, non-Newtonian high-viscosity fluid. Taking into account the characteristics of rod-type coatings, generally practical coating methods include roller coating, roller coating and scraper coating. Compared with blade coating, roller coating and slit coating are generally preferred, because they are easy to handle positive and negative color pastes of different viscosities to change the coating rate, and it is easy to control the thickness of the web coating. During the coating process, the uniformity of the slurry, especially the distribution of active particle size, should be controlled. 2. Li-ion battery assembly does not require a water environment, so it should be carried out in a glove box or a dry room. The dried anode and cathode are cut together according to the length required by the battery size. Then weld the electrode to the wire. The anode is composed of anode plate, diaphragm, cathode plate, and diaphragm from top to bottom. Insert the battery into the battery case, weld the negative electrode to the bottom of the battery case, then inject the electrolyte, weld the positive electrode wire to the shield valve, and then cover and seal to complete the battery assembly process to make a finished battery. The basic production process of prismatic battery and cylindrical lithium-ion battery is the same, but the sealing method is different. The prismatic battery is laser welded to integrate the casing and cover, while the cylindrical battery is a traditional crimp compression seal. The button cell assembly is to assemble the cathode material-the cover, add a certain pressure to make the active material close to the liquid collector, lie on a diaphragm, and then press the anode material and binder to form, the membrane, lower the electrolyte, and buckle the steel shell. Lithium-ion battery sealed button type. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Overcharge and overdischarge of some monomers in the battery pack