Lithium battery production process: the first step-preparation of electrode slurry

　　Lithium battery production process:

　　The first step--preparation of electrode slurry

　　is mainly to mix electrode active materials, binders, solvents, etc. together, stir and disperse sufficiently to form a slurry.

　　The second step-coating

　　The slurry prepared in the first step is uniformly coated on the current collector (aluminum foil or copper foil, etc.) with a specified thickness, and the solvent is dried.

　　The third step-pole piece punching

　　Punch the pole piece produced in the previous step into the specified size and shape.

　　The fourth step-stacking

　　Assemble the positive and negative plates and the separator together, and form the pole core after the glue is applied.

　　Step 5-Assemble the soft pack battery

　　Put the pole core produced in the previous step into the aluminum-plastic film that has been flushed, and complete the top seal, side seal, etc. (and leave a mouth for injection) to form a soft pack battery without injection.

　　The sixth step-injection

　　Inject a specified amount of electrolyte into the soft-pack battery cell. Of course, the battery cell needs to be baked, and the liquid injection operation is carried out in a low humidity environment, too much moisture content is not good.

　　Step 7-battery sealing

　　The gas inside the cell is drawn out and sealed in a vacuum environment.

　　With the rapid development of electric vehicles and automobiles, the power supply on vehicles has also developed rapidly. However, there are many problems in the production of batteries, resulting in uneven quality of battery products in the market and the later cycle life of battery capacity. Failure to reach the designed service life has a lot to do with the unique production process of the battery in production.

　　The structure of the battery is composed of a shell, an upper cover, an electrode plate, a separator, a bus bar, a pole, a bridge protection plate, and a terminal.

　　There are some differences in the processes of each lithium battery manufacturer, but they are inseparable. The main processes are: batching, coating, rolling, cutting, slitting, welding tabs, winding, packaging, baking, liquid injection , Formation, molding, volumetric testing and other steps.

　　There are differences in the time of each step. For general ingredients, baking and forming time is relatively long, it may take 10-48 hours. Other processes are faster, in 4-8 hours. It takes about 15 days in total.

　　With the rapid development of electric vehicles and automobiles, the power supply on vehicles has also developed rapidly. However, there are many problems in the production of batteries, resulting in uneven quality of battery products in the market and the later cycle life of battery capacity. Failure to reach the designed service life has a lot to do with the unique production process of the battery in production. The structure of the battery is composed of a shell, an upper cover, a pole plate, a separator, a bus bar, a pole, a bridge protection plate, and a terminal.

　　1. First of all, weigh the plates inside each battery and match the plates. The capacity of each cluster must be equal, otherwise the group with the smaller capacity will be fully charged in advance due to the small capacity, then the battery with the larger capacity has not been fully charged, the terminal voltage of the battery is low, and the total voltage is not fully charged and the final voltage continues. When charging, the group with a small capacity will be overcharged. If the battery is discharged, the group with the small capacity will have no power in advance. The voltage of other batteries is higher, and the total voltage of the battery does not have the termination protection of electric assist. Voltage, the discharge continues but it causes the battery to be over-discharged.

　　Overcharge and overdischarge of the battery as well as failure to charge the battery in time will affect the service life of the battery. However, the capacity of the battery with the smaller battery is further reduced, and the decrease of the battery capacity further causes the battery to be overcharged and overdischarged. This cycle causes the battery capacity to be very high. Decrease quickly and scrap.

　　2. Handling of plates before weighing

　　Before the electrode plates are weighed, it is necessary to clear the excess front edges, burrs, and excess active materials during paste application. If they are not clean, they will cause short circuit of the battery plates, that is, battery self-discharge. It is necessary to brush the earphone with a pole plate to clean the excess impurities on the pole plate to facilitate welding, so as to prevent false welding and false welding. Pick out the uneven plates, those with severe powder removal, and the plates with holes.

　　3. How to weigh the plates

　　When weighing and matching the plates, first weigh a part of the plates and place them on the workbench in sequence according to the weight, compare and mark the weight, and then weigh the plates that are not weighed on the weighing instrument. The weight of the plate is placed together with the plate placed on the workbench according to the weight of the weighed plate, which saves some trouble. (The weight difference of each group of positive plate or negative plate is as small as possible. The error of 10～14AH should not exceed 1g per group, and the error of 17～20AH should not exceed 2g per group.

　　Package partition

　　1. The weighed plates are assembled according to the regulations, and the plates are packaged after the group is assembled. The materials of the separators are common microporous rubber and glass fiber. Pay attention to the cleaning of the separators and place the plates on the separators. In the middle of the plate, if the position of the plate is aligned, place it in the plate box.

　　Kodi partition

　　Kodi partition

　　2. Double-piece positive plate, use very thin separators together to hug only the positive plate, do not wrap the negative plate, so as to avoid short circuits caused by the defects of the single-piece separator. Single-piece package board, use separator to package only the positive plate without the negative plate and put it in the package box, which is convenient and simple.

　　Lead parts selection and processing

　　1. Lead parts are made of lead welding rods and poles, which are cast in special molds. Generally, it is about 450°C. If the temperature is too high, lead oxidation is serious, and lead parts are cracked due to serious shrinkage, so it is not allowed to use iron to beat the mold. The lead parts should be made as far as possible to ensure that there are no thorns around, and if there are any, they should be trimmed.