2026-05-25Views：
many people think that the air compressor is a pump and can be used anywhere. But in the lithium battery material industry, the status of the air compressor is completely different. It is not a supporting role, but the core premise of whether the whole production line can run and whether the products can be qualified. For example, the lithium battery production line is like a person's body. The air compressor is the heart. The blood supply to the heart is unstable, and the whole body has problems.
the materials in lithium batteries, whether positive or negative, are extremely sensitive to water and oil. Even if there is a little bit of oil or water vapor in the air, the consequences are very serious.
When the oil touches the electrode material, it will form an invisible film on the surface, which will directly lead to the internal short circuit of the battery, the self discharge will be accelerated, and the safety accident will be caused.
When water touches the lithium salt in the electrolyte, it will decompose the lithium salt, produce corrosive substances, directly reduce the battery life, and may even bulge and leak.
Therefore, the requirements of the lithium battery industry for compressed air can be summarized in three words: absolutely oil-free, extremely dry, and very clean. If these three are the same, the product yield will drop significantly.
from the front-end material preparation to the final battery assembly test, almost every step is inseparable from compressed air.
Airflow crushing link
in the production process of positive electrode materials and negative electrode materials, raw materials need to be crushed to micron level. This crushing is not smashed with a hammer, but with compressed air to drive the airflow mill, so that the particles collide with each other in the high-speed airflow, fragmentation. This link requires extremely high stability of the air pressure. When the air pressure fluctuates, the size of the crushed particles is not uniform, which directly affects the electrochemical performance of the battery.
Pneumatic conveying link
lithium materials are mostly powdery, from one process to another process, relying on compressed air blowing away in the pipeline. This way no dust, no human contact, both clean and efficient. However, if there is oil and water in the air, the powder will agglomerate and block the pipeline, and the whole line will have to be stopped and cleaned.
Coating and drying links
the electrode slurry should be evenly coated on the metal foil. Before coating, the surface of the foil must be blown clean with compressed air, and no dust can be present. After coating, it enters the oven for drying. The temperature and air flow control during the drying process also depends on the valves and instruments driven by compressed air.
Liquid injection link
this is the most critical step. Before the electrolyte is injected into the battery, the inside of the battery cell must be swept with ultra-dry compressed air to drive out all the residual moisture and impurities in the cavity. If the air dew point in this step is not low enough, even if it is only a little bit, the moisture will react with the electrolyte, and the life and safety of the battery will be affected.
Nitrogen production link
nitrogen is widely used in lithium battery production as a protective gas. Nitrogen is used in the sintering kiln to prevent the material from being oxidized, and nitrogen is also used to isolate the air during liquid injection and encapsulation. The nitrogen is separated from the compressed air, and the air quality provided by the air compressor directly determines the purity of the nitrogen. The air is not clean, nitrogen is not clean.
Chemical composition and air tightness detection
after the battery is ready to go through the charge and discharge test, the pneumatic components of the test equipment are all driven by compressed air. Finally, the battery should be pressurized with compressed air to detect whether there is any leakage in the shell. These links have strict requirements on the stability of the air pressure and the cleanliness of the air.
although the traditional oil injection screw air compressor is cheap, it has a natural short board: oil. Part of the oil in the compression chamber will inevitably be mixed into the air in the form of oil mist, and it is difficult to be 100% clean after adding a filter. Moreover, oil mist will accumulate on the heat exchange tube of the cold dryer, and the heat dissipation effect will become worse over time. The cold dryer will have to work harder, the electricity bill will go up, and the maintenance will be frequent.
Although the dry oil-free screw machine has no oil problem, because there is no liquid in the cavity to fill the gap, the gas leakage is more serious, the efficiency is low, and the dry grinding between the rotors is fast, and the maintenance cost is not low.
The water lubricated air compressor just makes up the short board of these two schemes.
It uses clean water instead of oil to do the three things of lubrication, sealing and cooling. Because the water does not evaporate, does not produce oil mist, out of the air from the source is oil-free, cleanliness is very high. The specific heat capacity of water is large, and the ability to take away heat is stronger than that of oil. The temperature is controlled more smoothly during the compression process. The gas will not waste energy due to the high temperature, so the efficiency is higher than that of dry oil-free models.
Moreover, the water lubricated air compressor does not have such consumables as oil filter element and oil and gas separation core, and the later maintenance cost is much lower than that of the oil injection machine. The discharged gas and water are separated by a separation device, and the water is recycled back for subsequent use. No waste oil is generated, and the environmental protection pressure is also small.
In the lithium battery industry, after the water-lubricated air compressor is equipped with a cold dryer, the whole gas path will be much cleaner than the traditional scheme. There will be no sludge on the heat exchange tube of the cold dryer, and the heat dissipation efficiency is always on-line, without frequent cleaning, and the operation is more stable. The ultra-dry purge before liquid injection and the air intake quality of the nitrogen generator can be more reliably guaranteed.
in the lithium industry, air compressor once a problem, the impact is not a device, but the entire production line.
The air pressure is unstable, the coating thickness is not uniform, and the pole piece will be scrapped. If there is oil and water in the air, the whole batch of batteries may have problems in the liquid injection process. If the purity of nitrogen is not enough, the performance of the sintered material will not meet the requirements. These problems are often not discovered immediately, and they are not exposed until the stage of composition and capacity, and the cost of all the previous processes has been wasted.
Therefore, lithium battery companies choose air compressors not to see who is cheap, but who can continuously and stably provide clean, dry, pressure-free air. Water-lubricated air compressors are becoming an increasingly mainstream choice in the lithium battery material industry because of their oil-free, high efficiency, low maintenance, and good results with post-processing equipment.
In the lithium battery material industry, the air compressor is not an ordinary auxiliary equipment, but the core infrastructure that determines whether the product can be qualified and the production line can operate stably. With the natural advantages of oil-free, efficient and clean, water-lubricated air compressor, combined with cold dryer and nitrogen system, can pull the quality and stability of the whole gas path to a very high level, which is a key option for lithium battery enterprises to find a balance between quality and cost.
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