How to produce lithium battery

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.

1. The welding of clusters is the welding of positive and negative poles together with lead welding to form clusters. Oxygen-acetylene is used in tools that connect poles and busbars.

2. Place the wrapped polar plate in the cluster box, insert the polar plate in the cluster box into the comb board, and insert the negative pole into the positive pole first so that the polar ear is completely inserted into the comb board. If it is not in place, manually arrange it, and then place the file between the positive and negative ears, the bridge column, and the pole column.

3. Turn on the acetylene and oxygen of the welding gun and light it up to the appropriate size. The solder and rod move to the pole ear position, and then melt the lead bar and pole ear. After the bus is basically welded, the pole column is welded together with the bus. When welding, if there are impurities such as lead ash, it will find false welding and virtual welding. Polar column and bus welding is a key process in the production process. It is necessary to ensure strong welding, no virtual welding, and false welding. At this point, we must remove impurities while welding, and finally fill the bus.

4. After welding the bus, the inspection has no defects and then enters the slot process. Generally, the cluster with terminals must be loaded first and then installed in other clusters. The positive and negative poles are arranged in +-, +-, +-, +-, +-, +-series, and do not load the wrong polarity.

The bottom must be installed at the bottom of the plate slot, and then check whether the bridge column is normal. If there is a shift manual processing, whether the cover can cover the basic cluster trough is completed.

5. How does the polar group check that, first let's use the multimeter to measure whether the battery has a short circuit. If the voltage measured is zero or close to zero, prove that the battery has a short circuit and check the cluster to find the short-circuit position for repair. Check that there is no short circuit in the case of a multimeter positive and negative electrode connection. There is no negative voltage displayed. If there is any, prove that the polarity is reversed and then reloaded into the battery tank.

6. After the electrode plate inspection, there was no failure to enter the bridge welding. Polar welding is a key one. Welding CLIP column with bridge and welding column with oxygen. When welding, the flame must be guaranteed not to burn to the battery shell to ensure that there is no false welding, virtual welding, pole column out of the cluster, and can be closed smoothly. The battery seal is sealed, and the ratio of 2:1 is used with epoxy resin glue and curing agent. The glue should be used in time to avoid long solidification. The solidification of the colloid has a great relationship with the temperature. The higher the temperature, the faster the solidification, so use it as soon as possible. There is also a heating device for sealing.

7. After the battery cover is completed, pole welding is performed to detect whether the resulting pole is in the middle of the lead hole. If not, it must be corrected. The pole pole mold is placed on the leading pole and then soldered with oxygen to melt the pole column. There is also a kind of welding. The terminal is placed on the leading pole, and the position must be placed. The soldering iron is used to melt the Hanxisi and weld the terminals and poles together. When welding, pay attention to false welding and false welding.

, electrolyte configuration

Lead battery electrolyte is made of pure water and concentrated sulfuric acid. The density of automotive battery electrolyte is

1.280 ± 0.005 g/cm3(25 °C).

Cordy electrolyte

Cordy electrolyte

2 The container for the preparation of electrolytes must be a glazed ceramic, glass cylinder, plastic tank or lead lined wood tank that is resistant to acid and temperature. When preparing, the staff must wear protective equipment;

Wash the vessels before preparation and wash them with pure water;

When preparing electrolytes, we should first put the pure water into the container, then slowly inject concentrated sulfuric acid into pure water, and constantly stir.

Conversion formula d25 = DT +0.0007(t-25)

D25:25 °C electrolyte concentration DT: electrolyte concentration at T temperature

0.0007: Temperature coefficient T: Measured electrolyte concentration

1. The composition of the electrolytic liquid is mainly distilled water and sulfuric acid. At the time of configuration, the container must be acid-resistant and clean.

2. Staff should be aware of safety and wear acidproof gloves and clothes when working. If sulfuric acid splashes on the skin during operation, the skin should be washed repeatedly with water in time. The distilled water is first poured into a clean container and then slowly introduced into the concentrated sulfuric acid and stirred with an acid resistant tool. If the temperature is too high to stop adding acid to prevent the temperature from spilling out of high acidity, it can be matched to 1.1:28 at a temperature of 25 °C. It is forbidden to pour water into acid when configuring.

3. According to the battery capacity of the added acid, the capacity of the battery shell, the acid density, the loss of the distribution group in the charge and discharge, etc., can be calculated, because the acid is no longer pumped out after the charge and discharge group.

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