In 2017, CATL Ningde era won the global lithium-ion battery sales list. This proves that China's lithium battery has also broken through Japan and South Korea, and is emerging as a global leader in the lithium-ion battery industry. Why was this young new energy company founded in 2011 able to come to the fore? Why can we maintain the industry record of “zero accidents†in lithium batteries for vehicles?
Recently, the documentary "Great Powers" broadcast on CCTV 2 has aroused my interest in the star company of CATL Ningde era. Today, let us walk into the production workshop of the CATL Ningde era, and take a look at how this battery that was vyed by Volkswagen, BMW and Mercedes is made.
The cell is the smallest unit of a battery system. A plurality of batteries form a module, and then a plurality of modules form a battery pack, which is the basic structure of the vehicle power battery. The battery is like a container for storing electrical energy. How much capacity can be stored depends on how much active material is covered by the positive and negative electrodes. The design of the positive and negative electrode pole pieces needs to be tailored to different models. The gram capacity of the positive and negative materials, the ratio of the active material, the thickness of the pole piece, and the compaction density are also important for the capacity.
Pulping of active materials - mixing process
Stirring is to stir the active material into a slurry by a vacuum mixer. This is the first process of battery production. The quality control of this process will directly affect the quality of the battery and the pass rate of the finished product. Moreover, the process of the process is complicated, and the raw material ratio, the mixing step, the stirring time and the like have high requirements.
Stirring here is the active material of the battery
The mixing workshop in Ningde era strictly controls dust
In addition, in the process of mixing, it is necessary to strictly control the dust to prevent the dust from affecting the consistency of the battery. In the production workshop of the Ningde era, the level of control of the dust is equivalent to the medical level.
Apply the stirred slurry to the copper foil - coating process
This process is to evenly spread the slurry that has been stirred after the previous process at a speed of 80 meters per minute onto the 4,000-meter-long copper foil. The copper foil before coating is only 6 microns thick and can be described as "thin as silkworm wing".
The most important coating process is the consistency of thickness and weight.
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. Failure to do so may cause the battery to discharge too quickly and may even present a safety hazard.
Pressing the negative electrode material on the copper foil and then cutting it - cold pressing and pre-cutting
In the rolling workshop, the pole pieces with the positive and negative materials are pressed by rollers to make the coated materials tighter, increase the energy density, ensure the consistency of thickness, and further control the dust on the other hand. And humidity.
Cold pressing is to compact the positive and negative materials on the aluminum foil, which is also important for increasing the energy density.
The cold-pressed pole piece is slit according to the size of the battery to be produced, and the burr (where the burr can only be seen under the microscope) is fully controlled. The purpose of this is to prevent the burr from penetrating the diaphragm and causing serious damage. Security risks.
Cut out the small ears of the positive and negative electrodes on the battery - die cutting and slitting
The die cutting process is to form a conductive electrode ear for a battery cell by using a die cutting machine. We know that the battery is divided into positive and negative poles. The ear is the metal conductor that leads the positive and negative poles from the battery core. Generally speaking, the ears of the positive and negative poles of the battery are the contact points when charging and discharging.
The next striping process is to cut the battery pole piece through the cutter.
The ear die is simply a small ear that makes both positive and negative poles.
Complete the prototype of the battery core - winding process
Here, the positive electrode tab, the negative electrode tab, and the separator of the battery are combined into a bare cell in a wound manner. The advanced CCD vision inspection equipment can realize automatic detection and automatic deviation correction to ensure that the battery core piece is good.
After the winding process, the prototype of the battery core is basically formed.
With the aid of CCD visual inspection equipment, the battery production workshop of CATL Ningde era is one of the most automated battery production workshops in the world.
Remove moisture and inject electrolyte - baking and injecting
Moisture is the enemy of the battery system. The battery baking process is to ensure that the water inside the battery meets the standard and ensure that the battery has good performance throughout the life cycle.
In order to remove moisture, the battery needs to be baked.
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