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

Now new energy vehicles have developed rapidly, from less than 5% of the market share in the 1990s to 25%. In the future, it could reach between 80 and 90 percent of the market. So the demand for power batteries is skyrocketing. Now the power battery has also been rapid development. So how do you make a power battery? I believe many people do not know, a power battery from raw materials to become a battery, the process is quite complex, is not the general small business can do, input equipment is very much, the cost is very high. Here is a general description of the power battery production process and the equipment needed.

The first step: Pulping the active material

The materials needed for the power battery are mixed and stirred evenly under vacuum. Strict process requirements and formula directly affect the qualified rate and durability of the battery, as well as safety, can be said to be the lifeblood of a power battery enterprise. The equipment to be used is the mixer. Production environment, dust control needs to reach medical grade dust-free aseptic workshop.

The second step: coating process

The mixed material is evenly coated on the copper foil with a thickness of 6 microns. The width is generally 500 mm and the length is 4000 m. Uniform thickness, no mixed dust. The automatic equipment needed is "coater".

The third step: cold press and precut

That is, the coated copper foil is mechanically extruded, so that the material is distributed more evenly on the copper foil and has better adhesion. The cold pressed electrode is cut according to the type of battery when making the battery. Pole slice burr is needed to use a microscope for observation and inspection, is absolutely can not have more than 4 micron burr. The equipment needed is "cold pressure scuttling all-in-one machine".

Step 4: Cut the pole ear and strip

You cut out the shape of the battery after expansion, the positive and negative welding ears and the shape of the battery. Before the use of mold cutting, now all use laser cutting. The equipment is "laser pole ear molding Machine".

Step 5: Wrap or stack

According to the shape of the battery, it can be divided into circular and square, and the lamination is basically square battery. You roll the battery into a prototype. The equipment is "winding machine and laminating machine".

Step 6: Fill the fluid

That is, the battery cell is filled with the liquid needed to charge it. The electrolyte is the key to the key. The required equipment is "injection machine".

Step 7: Bake

Put the battery cell into the oven to bake and remove the moisture. Equipment "oven"

Step 8: Formation

It is the internal activation of the battery after the injection. Including secondary injection, weighing, welding and sealing processes.

Step 9: Code

That is, each battery is traceable, marked with production date, batch and other information, so that it can be traced.

Did you think the battery would be ready to use at this point? No, but also to put a coat on the battery, do not let the battery run naked.

Step 9: Mold the module

That is, each battery is traceable, marked with production date, batch and other information, so that it can be traced.

Did you think the battery would be ready to use at this point? No, but also to put a coat on the battery, do not let the battery run naked.

Step 10: Mold the module

Multiple battery cells with similar performance after inspection are assembled. Clean the battery first (using plasma cleaning technology) to keep the battery clean and pollution-free. Then the glue is arranged and assembled on the outside, generally using aluminum boxes to accommodate the assembled cell. The cells are then connected in series using laser welding equipment. The battery production is almost complete, so can it be shipped to the market for use? Of course not. Testing and destructive testing are required.

Step 11: The battery's ultimate test

1. Fire test: 130 seconds of burning in 590° flame without the battery shell catching fire. The battery can be used normally. This is the national rigid standard, the manufacturer's test is much higher than this standard. Generally required to burn for 1 hour without failure before release.

2. Collision test, simulate the field car turbulence, so that the battery in the artificial vibration environment collision. That's equivalent to 100,000 kilometers of bumps on a car. No failure in this test, no fire to ensure absolute safety.

3. Extrusion test simulating car accident site. According to the most serious traffic accident site data to do the extrusion test, the battery after severe extrusion does not fire, does not burn. After a series of tests, qualified batches of products are finally ready to be seen by users.