Battery production process

Introduction to lithium battery

Lithium batteries are just liquid lithium-ion batteries coated with a polymer shell. In the structure of aluminum plastic film packaging, in the event of safety hazards, the flexible battery will only crack the gas.

Lithium battery parameters

Nominal voltage: 3.7 V

Operating voltage: 2.4 ~ 4.2 V

Lithium battery advantages

1. Good safety performance soft pack batteries are packaged with aluminum plastic membranes in the structure. In the event of safety hazards, soft pack batteries will only crack the air, unlike the aluminum shell core that will explode.

2. Lightweight soft pack batteries are 40 % lighter than the same capacity of lithium steel shell and 20 % lighter than aluminum shell batteries.

3. Large-capacity soft pack batteries have a capacity of 10 to 15 % higher than steel shell batteries of the same size and 5 to 10 % higher than aluminum shell batteries.

4. The internal resistance of the small internal damper battery is smaller than that of the lithium battery. At present, the internal resistance of the domestic soft pack battery core can be below 35mΩ, which greatly reduces the battery's self-consumption.

5. Design flexible soft pack battery shape can be customized according to customer demand, develop new type of core.

Deficiencies of flexible lithium batteries

The existing soft pack battery core models are few and can not meet the market demand;

Developing new models is expensive.

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.

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