Process Analysis of Lithium Battery Production Process

Lithium batteries have entered people's daily lives on a large scale, but where does it come from? What is the process of lithium battery production? Although there are some differences in the production process of lithium batteries depending on the manufacturer of lithium batteries, due to the same principle, the main lithium battery production processes are also basically the same. Generally, there are: ingredients, coating, roller pressure, cutting pieces, sub-bars, welding ears, winding, Packaging, baking, injection, chemical, molding, capacity testing and other processes.

Among the necessary steps in the production process of the lithium battery mentioned above, five aspects should be paid attention to from the selection of materials to the detection of the component capacity after molding:

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

(1) Appropriate ion doping of the material,(2) improving the particle size distribution of the active material, avoiding the wide distribution of the particle size of the active material, and(3) trying to use materials with a disordered layered structure or a thin layer structure. 4, improve the surface structure of electrode material;

Second, the high bond strength of the electrode coating is conducive to reducing the rate of reduction of cyclic capacity. This is the most technical process in the production process of lithium batteries. For this reason, it should be noted that:

1) The binders and solvents that form the adhesive material should be pure, and the coated polar tablets should not be stored for too long. 2. The binders used in the mixture of positive and negative polar coatings should be appropriately matched with active substances. Ensure that the film does not fall off the powder, do not dedusting;

Third, optimize the composition of the electrolyte. The requirement for the electrolyte in the lithium battery production process is to maintain the capacity and extend the battery life:

By optimizing lithium salts, solvents and additives, the conductivity of electrolytes will be improved, the polarization will be reduced, and the reaction of positive materials with electrolytes will be suppressed. 3, improve the surface structure of the negative electrode material by controlling the appropriate specific surface area and surface treatment such as coating, film forming, and surface chemical reaction of the carbon negative electrode material;

Fourth, after the battery material preparation is completed, the lithium battery production process enters the assembly process. At this time, it should be noted that:

1, the negative pole capacity is slightly greater than the positive pole capacity, 2, after winding the positive and negative poles and the diaphragm, the resulting positive and negative plates and the diaphragm are not more than 0.5 mm in size, and the upper and lower deviations are not more than 0.5 mm.

Fifth, when measuring capacity, according to national standards, it is appropriate to charge at a low rate, usually 0.2 C.

In general, in the process manufacturing stage should pay attention to the following ratio relations: extremely one-sided and polar compaction density, negative polar surplus ratio, formula process, electrolyte and positive and negative polar matching suitable dosage.

There are differences in each step of the lithium battery production process. Under normal circumstances, ingredients, baking, turning into a long time, a minimum of 10 hours, and a long two days and two nights; Other processes are relatively fast, averaging 5 or 6 hours. The entire lithium battery production process takes about 15 days.

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