The core of new energy vehicles, the manufacturing process of power battery

Today's new energy vehicles are growing rapidly, with market share growing from less than 5% in the 1990s to 25%. In the future, it may reach 80-90% of the market. So the demand for power batteries is also soaring.best lithium ion battery machine company Now the power battery is also developing rapidly. So how are power batteries made? I believe that many people do not know, a power battery from raw materials to the battery process is quite complex, not the average small business can do. A lot of equipment is invested and the cost is very high. The following is a brief introduction to the power battery production process and the equipment needed.

1. Pulping of active materials

The materials required for power battery are mixed and stirred well under vacuum. Strict process requirements and formulations directly affect the battery's qualification rate and durability,equipment for lithium battery assembly as well as safety, which can be said to be the lifeline of a power battery company. The equipment to be used is a mixer. The production environment and dust control need to reach the medical grade dust-free and aseptic workshop.

2.Coating process

The mixed material is evenly coated on the copper foil, which has a thickness of 6 microns. The general width is 500mm and the length is 4000m, which requires uniform thickness and no dust. The automated equipment required is a "coating machine".

3. Cold pressing and pre-slitting

The coated copper foil is mechanically extruded, so that the material is more evenly distributed on the copper foil and has better adhesion. The cold pressed pole piece is slit according to the battery model when making the battery. The burr of the slit pole piece needs to be observed and inspected with a microscope, and there should never be a burr larger than 4 microns. The equipment needed is "Cold Press Slitting Machine".

4.Cutting lugs and slitting

This is to cut out the shape of the expanded battery, the positive and negative welding lugs and the shape of the battery. In the past, we used to use a mold to cut the lugs, but now we use a laser to cut the lugs. This machine is "Laser Ear Forming Machine".

5. Winding or Stacking

According to the shape of the battery, the winding can be divided into round winding and square winding, and the stacked sheet is basically a square battery. It is to roll the cell into a prototype of battery. The equipment is "winding machine and laminating machine".

6. Liquid injection

It is to inject the liquid needed for charging into the battery cell. Electrolyte is the key. The required equipment is "liquid injection machine".

7.Baking

Bake the liquid-filled cell in an oven to remove moisture. Equipment "Oven"

8.Formation

It is the internal activation of the battery technology after liquid injection. One of the processes includes secondary liquid injection, weighing, welding and sealing.

9.Molding module traceability marking

Is the traceability marking of each battery, marking the production date, batch and other information for traceability.

Do you think this battery can be used? No, we need to install a shell for the battery.

10.Laser Welding

After checking the performance requirements are similar to the combination of multiple battery cells can be together. First cleaned (using plasma cleaning technology) so that the battery cell clean to maintain a clean and pollution-free. Then in the outer edge of the spot glue arrangement assembled together, generally use the aluminum box to accommodate the assembled battery cells. Then use laser welding process equipment to a group of battery cells in series. Battery safety production management is basically complete, so that can ship to the market economy to use the method? Of course, it can not, but also need to analyze the test and destructive impact test inspection.

11. The ultimate test of the battery

Fire test, in the 590 ° flame burning 130 seconds battery shell does not catch fire. Battery cells can be used normally. This is a national hard standard, the manufacturer's test is much higher than this standard. General requirements for burning 1 hour without failure before release.

Crash test, simulated vehicle bumps in the field, so that the battery in the artificial vibration environment collision. Equivalent to the vehicle driving 100,000 kilometers of bumps data. In this test, it will not fail or catch fire to ensure absolute safety.

Simulated traffic accident field crush test. Based on data from the most serious traffic accidents, the battery will not catch fire or burn after severe crushing. After a series of tests, the qualified batch of products finally meets the user's requirements.