The five Aspects of Lithium Battery Production Process

There are some differences in the production process of lithium batteries depending on the manufacturer of lithium batteries. However, 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, dividing, welding polar ears, winding, Packaging, baking, injection, chemical, molding, capacity testing and other processes.

Lithium batteries occupy a place in people's daily life, but where does it come from? What link does lithium battery production technology have again? 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 basically the same.

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, improve the particle size distribution of active materials to avoid the particle size distribution of active materials too wide,

3, use as much as possible with a disordered layered structure or 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 bonding agent and solvent that form the adhesive material should be pure, and the coated polar film should not be stored for too long.

2, the mixture used in the positive and negative polar coating materials should be appropriate to the proportion of active substances, to ensure that after the coating does not fall off powder, do not depollinate;

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:

1) By optimizing lithium salts, solvents and additives, the conductivity of the electrolyte will be improved and the polarization will be reduced.

2, inhibit the reaction of positive polar materials with electrolytes,

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, negative pole capacity slightly greater than positive pole capacity,

2, after winding the positive and negative poles and the diaphragm, the gap particle size between the positive and negative plates and the diaphragm formed is not more than 0.5 mm, 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, up to about 10 hours, and more than 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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