Five aspects that need to be paid attention to in the production process of lithium batteries

　　The production process of lithium batteries differs depending on different lithium battery manufacturers, but due to the same principle, the main lithium battery production processes are basically the same, generally including: ingredients, coating, rolling, cutting, slitting, Welding tabs, winding, packaging, baking, liquid injection, forming, forming, sub-volume inspection and other processes.

　　The production process of lithium batteries differs depending on different lithium battery manufacturers, but due to the same principle, the main lithium battery production processes are basically the same, generally including: ingredients, coating, rolling, cutting, slitting, Welding tabs, winding, packaging, baking, liquid injection, forming, forming, sub-volume inspection and other processes.

　　Lithium battery occupies a place in people’s daily life, but where does it come from? What are the links in the production process of lithium batteries? Although the production process of lithium batteries varies according to different lithium battery manufacturers, they are mainly due to the same principle. The production process of lithium batteries is basically the same.

　　In the necessary steps of the above-mentioned lithium battery production process, five aspects should be paid attention to from material selection to volumetric inspection after molding:

　　1. Improve the physical and chemical structure of the positive and negative active materials, which is the basic link of the lithium battery production process:

　　1. Proper ion doping of the material,

　　2. Improve the particle size distribution of the active material and avoid the excessively wide particle size distribution of the active material.

　　3. Try to use materials with disordered layered structure or thinner layer structure,

　　4, improve the surface structure of the electrode material;

　　Second, the high bonding strength of the electrode coating is beneficial to reduce the cycle capacity drop rate. This is the most technical process in the lithium battery production process. For this reason, attention should be paid to:

　　1. The binder and solvent forming the adhesive material should be pure, and the coated film should not be stored for too long.

　　2, the ratio of the adhesive used in the mixture of the positive and negative electrode coating film to the active material should be appropriate to ensure that the powder does not fall off and does not come off after the coating;

　　Third, the optimization of electrolyte composition, the lithium battery production process requires the electrolyte to maintain capacity and extend battery life:

　　1. Through the optimization of lithium salt, solvents and additives, the conductivity of the electrolyte is improved and the polarization is reduced.

　　2, inhibit the reaction between the cathode material and the electrolyte,

　　3. Improve the surface structure of the negative electrode material by controlling the appropriate specific surface area and surface treatment such as coating, film formation and surface chemical reaction on the carbon negative electrode material;

　　Four. After the preparation of battery materials is completed, the lithium battery production process enters the assembly process. At this time, attention should be paid to:

　　1. The capacity of the negative electrode is slightly larger than the capacity of the positive electrode,

　　2. After winding the positive and negative electrodes and the separator, the gap particle size between the formed positive and negative electrode sheets and the separator is not more than 0.5mm, and the upper and lower deviations are not more than 0.5mm.

　　5. When performing capacity separation testing, it is advisable to charge at a low rate in accordance with national standards, generally 0.2C.

　　Generally speaking, the following proportional relations should be paid attention to in the process and manufacturing stage: the compaction density of the pole piece surface and the pole piece, the excess rate of the negative electrode, the formulation process, and the appropriate amount of electrolyte and the positive and negative electrodes.

　　There are differences in the time of each step in the lithium battery production process. Generally, the ingredients, baking, and formation time are long, ranging from about 10 hours to at least two days and two nights; other processes are relatively fast, with an average of 5 or 6 Hour. The entire lithium battery production process will take about 15 days.