The main lithium battery production processes are basically the same,
generally including: ingredients, coating, rolling, cutting, slitting, welding
tabs, winding, packaging, baking, injection, forming, forming, and dividing.
Inspection and other processes.
Lithium batteries have entered people’s daily lives on a large scale, but
where did they come from? What are the links in the lithium battery production
process? Although there are some differences in the production process of
lithium batteries depending on different lithium battery manufacturers, the main
lithium battery production processes are basically the same due to the same
principle, and generally include: batching, coating, rolling, cutting, and
slitting , Welding tabs, winding, packaging, baking, liquid injection, forming,
forming, sub-volume testing and other processes. 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:
One. 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 active materials and avoid
excessively wide particle size distribution of active materials.
3. Try to use materials with disordered layered structure or thinner layer
structure,
4. Improve the surface structure of electrode materials;
2. 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, pay attention to:
1. The binder and solvent forming the adhesive material should be pure, and
the coated pole piece should not be stored for too long. 2. The ratio of the
adhesive and active material used in the positive and negative coating film
mixture should be appropriate to ensure the coating film Do not drop or take off
powder afterwards;
Three, the optimization of electrolyte composition, the requirement of the
lithium battery production process for the electrolyte is 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.
The reaction between the cathode material and the electrolyte is inhibited,
3. Improve the surface structure of the negative electrode material by
controlling the appropriate specific surface area and coating, filming and
surface chemical reaction of the carbon negative electrode material;
Four. After the preparation of the battery materials is completed, the
lithium battery production process enters the assembly process. At this time,
please pay attention 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 between the formed positive and negative
electrode sheets and the separator shall not exceed 0.5mm in size, and the upper
and lower deviation shall not exceed 0.5mm.
5. When testing the capacity, it is better 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. The time of each step in the lithium
battery production process is different. Generally, the ingredients, baking, and
formation time are long, at least about 10 hours, and the longest takes two days
and two nights; other processes are relatively fast, with an average of 5 or 6
Hour. The entire lithium battery production process takes about 15 days.
