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Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-03-11 Hits: Popular:AG11 battery
As we all know, the positive electrode substrate of a lithium-ion battery is aluminum foil, and the negative electrode substrate is copper foil. After coating, the positive electrode sheet roll and the negative electrode sheet roll are made for the next step of processing. The quality of the pole pieces has basically determined certain performance of the battery, and the coating of the substrate is a very important part of the entire battery manufacturing process!
Coating methods have evolved from the original dip coating and extrusion to the most advanced double-sided simultaneous coating, all in order to improve the coating quality and performance of the pole pieces. Some domestic units with strong economic strength, in order to ensure reliable manufacturing performance For lithium-ion batteries, a large amount of money has been spent to introduce expensive pole plate coating machines from abroad.
The general process flow of coating: the coated substrate (metal foil) is fed into the coating machine from the unwinding device. The first and last ends of the substrate are connected into a continuous belt on the splicing table and sent to the tension adjustment device and the automatic correction device by the puller device. After adjusting the film path tension and the film path position, they enter the coating device. The pole piece slurry is coated in sections according to the predetermined coating amount and blank length in the coating device. During double-sided coating, the front coating and blank length are automatically tracked for coating. The coated wet electrode sheet is sent to the drying tunnel for drying. The drying temperature is set according to the coating speed and coating thickness. The dried pole pieces are rolled up after tension adjustment and automatic deviation correction for the next step of processing.
The pole piece slurry coating is relatively thick, the coating volume is large, and the drying load is large. Currently, hot air impact drying technology is commonly used. The positive electrode substrate is aluminum foil. The chemical properties of aluminum foil are very active and are easily oxidized. During the manufacturing process of aluminum foil, a dense oxide film will be formed to prevent further oxidation of the aluminum foil. Because the oxide film is thin, porous, soft, and has good adsorption properties, high temperature and high humidity can destroy this oxide film. Speed up the oxidation reaction. At present, most of them adopt a single-sided coating method. When the first side is coated, the other side is completely exposed to the hot air. However, the dry hot air for coating (oil system) should be around 130°C, such as in hot air. If the moisture content is not effectively controlled, it will intensify the oxidation of the aluminum foil and affect the adhesion between the positive electrode material and the aluminum foil. In severe cases, it may even cause falling off.
Coating machine manufacturers in the United States and Japan developed double-sided simultaneous coating technology to address the energy efficiency of single-layer coating machines and the oxidation of aluminum foil, which completely solved the problem of aluminum foil oxidation during coating. However, the price of double-sided simultaneous coating machines is astronomical It is not something that ordinary battery manufacturers can afford.
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