Production process of lithium batteries

Production process of lithium batteries:

Step 1 -- Preparation of electrode slurry

It is mainly mixed with electrode active materials, binders, solvents, etc., and fully stirred and dispersed to form a slurry.

Step 2 -- Coating

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

Step 3-Polar-cutting

Cut the last step of the poly into the specified size shape.

Step 4 -- Stack

The positive and negative electrode and diaphragm are assembled together to form a polar core after the adhesive is completed.

Step 5-Assembly of soft pack batteries

The core produced in the previous step is loaded into the aluminum plastic film that has been flushed into the pit, and the top seal, side seal, etc. are completed (and a mouth fluid is left) to form a soft pack battery without injection.

Step 6 -- Injection

The assigned amount of electrolyte is injected into the inner core of the soft package. Of course, the core must be baked, and under the low humidity environment to carry out liquid injection operations, too much water content is not good.

Step 7 -- Battery seal

The gas inside the core is extracted and sealed in a vacuum environment.

With the rapid development of electric vehicles and automobiles, the power supply on the car has also developed rapidly. However, there are many problems in the production of batteries, resulting in a very uneven quality of battery products in the market. The battery's capacity can not reach the designed service life, which has a great relationship with the battery's unique production process in production.

The structure of the battery consists of a shell, an upper cover, a polar plate, a partition, a bus, a pole column, a bridge protection plate, and a terminal.

There are some differences in the process of each lithium manufacturer, but there are many changes. The main processes are: ingredients, coating, roll pressure, cutting, spline, welding ears, winding, packaging, baking, injection, and transformation. Forming, split capacity testing and other steps.

There is a difference in the time of each step. The general ingredients, baking, and turning into a long time may take 10-48 hours. Other processes are relatively fast, in 4-8 hours. It 'll take about 15 days.

With the rapid development of electric vehicles and automobiles, the power supply on the car has also developed rapidly. However, there are many problems in the production of batteries, resulting in a very uneven quality of battery products in the market. The battery's capacity can not reach the designed service life, which has a great relationship with the battery's unique production process in production. The structure of the battery consists of a shell, an upper cover, a polar plate, a partition, a bus, a pole column, a bridge protection plate, and a terminal.

1. First of all, the polar plate inside each battery must be weighed and the polar plate group must be assigned. The capacity of each cluster must be equal, otherwise the small group of capacity will be fully charged in advance due to the small capacity, then the large capacity battery is not full, the end voltage of the cell is low, and the total voltage is not full. The end voltage is still charging. The group with small capacity forms a charge. If the battery is discharged, the group with small capacity will lose its power in advance. The other battery end voltage is higher, and the total voltage of the battery does not have an electrically-assisted termination protection voltage. The discharge continues, however, causing the battery to overdischarge.

Overcharge and over-discharge of the battery, as well as delays in charging, will affect the service life of the battery. However, the battery capacity of the battery group is further reduced, and the reduction of the battery capacity further causes the group to overcharge and overdischarge. This cycle causes the battery capacity to quickly decrease and scrap.

2. Treatment of weighing front plates

Before the plate is weighed, it is necessary to clarify the excess front edge of the plate deletion production, the burrs, and the excess active material during the anointing. If it is not clean, it will cause a short circuit of the battery plate, that is, the battery self-discharge. Brush the earphone with the pole plate to brush off the excess impurities on the plate for easy welding, in order to prevent virtual welding, false welding. To have the pole plate uneven, seriously depollinated, the pole plate has holes, selected out.

3. How to weigh the polar plate

When the pole plate is weighed and matched, it is necessary to first weigh out a part of the plates and discharge them on the workbench according to the weight, and compare the weights. Then weigh the plates on the scales and weigh them on the scale. The weight of the plate is placed with the plate placed on the table according to the weight of the plate, thus eliminating some trouble. (The difference in weight between each group of positive or negative plates 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.

Packaging panel

1. After weighing, the polar plate is assigned according to the regulations, and after the group is matched, the envelope is used. The material of the partition is generally used for microporous rubber and glass fiber. When packing, care must be taken to clean the diaphragm. The polar plate must be placed in the middle of the partition. If the position of the pole plate is aligned, put it in the pole box.

Cordy partition

2. Double packet positive plate, with a very thin partition plate together only to hold the positive plate, do not wrap the negative plate, this can avoid the short-circuit caused by the single chip partition defect. Single plate, with the partition only for the positive plate packaging non-negative plate in the package box can be convenient and simple.

Selection and Processing of Lead Parts

1. Lead pieces have lead welding strips and pole columns, and they are made of special molds. Generally around 450 °C, the temperature is too high and lead oxidation is serious. The lead parts cause cracks due to serious shrinkage, and iron tools are not allowed to be used to beat the mold. Make sure the lead is as free as possible and trim if available.

Kodi Lead

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