What are the battery manufacturers in China?

Mainly in the following, quality and brand are better:

1, Scud

2, super force

3, Yalitong

Others are small factories. The quality is also unstable. The above three manufacturers can be strong. In addition, the above three manufacturers also do OEM (OEM products)

China's good solar panel manufacturers I said that the two largest of China's own, one is Tianwei Yingli and the other is Wuxi Suntech, the two are China's largest, Yingli in the north and Suntech in the south.

First, let's take a look at the production line of batteries. This is the first domestic and international first-class automation production line. The BMW X1 and the new 5 series batteries were born here.

All personnel entering the workshop must wear clean clothes, hats and masks. After completion, they need to pass the spray room for 360 degrees without dead angle.

The temperature-controlled, moisture-controlled, dust-free factory is comparable to the manufacturing environment of semiconductor microelectronics.

The busy RGV automatically transports materials and materials for the equipment according to the set track.

Lonely robotic automatic disk reel

With the help of high-tech robots, central control systems, online testing equipment and information traceability systems, catl's production line can achieve "production data visualization", "production process transparency", "production site unmanned."

Having said that, how exactly did the battery core come out? Let us first understand the structure of the battery.

The cell is the smallest unit of a battery system. M batteries form a module, and N modules form a battery pack (Pack), which is the basic structure of the vehicle power battery.

A battery is like a container for storing electrical energy. How much capacity can be stored depends on how much active material is loaded on the positive and negative plates.

The pole piece is mainly completed by three processes of stirring, coating and cold pressing:

Stir

Stirring is to mix the positive and negative solid battery materials uniformly, add the solvent, and stir to form a uniform slurry by a vacuum mixer.

Coating

The stirred active material was uniformly applied to the top and bottom of the 4000 m long copper foil at a speed of 80 meters per minute. The copper foil before coating is as thin as a flap and is only 6 microns thick.

Coating is essential, and it is necessary to ensure that the thickness and weight of the pole piece are the same. Otherwise the consistency of the battery will be affected. The coating must also ensure that no particles, debris, dust, etc. are mixed into the pole pieces. Otherwise, the battery will be self-discharged too quickly or even a safety hazard.

Cold pressing & pre-cutting

The roller press compact the coated sheet to a predetermined thickness and density.

Polar ear cutting & slitting

In this case, die - cutting machine die - cutting to form a cell of the conductive ear. The pole ear is the battery head ear, popularly said is the battery positive and negative pole ear when carries on the charge discharge connection point.

Then, the pole piece is slit by a cutter.

Winding

The positive electrode tab, the negative electrode tab, and the separator of the battery cell are combined in a wound manner to form a bare cell. The advanced CCD can realize automatic detection and automatic correction, ensuring that the battery core is good.

Assembly

The wound bare cells will be automatically sorted and paired, and then subjected to the procedures of tab welding, folding tabs, mounting top brackets, hot melt Mylar, shelling, and shell welding. At this point, the bare cell has a hard outer casing.

baking & Injecting

The battery baking process is to achieve the internal moisture of the battery, ensuring good performance of the battery throughout its life cycle.

Injecting liquid is to inject electrolyte into the baked battery. The electrolyte is like the blood flowing in the body of the battery. The exchange of energy is the exchange of charged ions. These charged ions are transported from the electrolyte to the other electrode to complete the charge and discharge process.

Turn into

The formation is a process of activating the cell after the injection, and the SEI film is formed by chemical reaction inside the cell through charge and discharge to ensure the safety, reliability and long cycle life of the subsequent cell during the charge and discharge cycle.

In order to have good performance of the battery core, the battery manufacturing process also undergoes a series of "physical inspection processes" such as X-ray inspection, welding quality inspection, insulation inspection and capacity testing.

A super-powered super-cell is born.

Each cell unit that has been fabricated has a separate two-dimensional code that records the date of manufacture, manufacturing environment, performance parameters, and so on. A powerful traceability system can record any information. If an abnormality occurs, the production information can be retrieved at any time; at the same time, the big data can be data-supported for subsequent improved designs.

The page contains the contents of the machine translation.