The production process of lithium battery copper foil consists of a copper melting process, an electrolytic foil production process, a surface treatment process, and a cutting and testing process. In order to better understand the application of ultra-thin copper foil for lithium batteries and electronics, we briefly introduce its production process.
Electrolytic foil production: dissolve the raw material of copper, and perform high-current-density electrolysis in the electrolytic device (in the electrolytic tank). After specifying the thickness, the raw foil materials are rolled up sequentially. Surface treatment: In order to meet some performance requirements of the material, the copper foil surface is treated (electrical and chemical treatment) and cleaned
Slitting and cutting
Product electrolytic foil production process and surface treatment process are the key to the control of product quality. At present, domestic foil machines and surface treatment equipment are mainly imported from Japan and South Korea, such as South Korea pnt and so on. From the perspective of localization, the foil machine and surface treatment equipment have become mature. Related equipment manufacturers and key parts suppliers such as Shanghai Baisheng, Xi'an Aerospace Machinery, Hongtian Machinery, etc. can provide related supporting equipment. These enterprises are also in the A large number of applications have been obtained among domestic users, such as Ningde Times, Jiayuan Technology and other companies. Copper foil production thickness can meet the 6μm thickness products. At the same time, domestic related equipment manufacturers are developing technology.
The application of the rubber roller is mainly in the foil machine, post-processing and slitting process. The electrolytic copper foil raw foil machine is divided into two categories in terms of use, namely the standard copper foil raw foil machine and the raw foil anti-oxidation integrated machine. The standard copper foil raw foil machine mainly includes a full titanium tank, cathode roller drive, winding Device, tension system, on-line polishing, flow distribution device, apron stripping device, acid mist ventilation device, etc., are used in raw materials in CCL, PCB and other industries. The main equipment with anti-oxidation works. Combining the raw foil and anti-oxidation processes in the production process of copper foil for lithium batteries into one, concentrated in one equipment, greatly improving the product yield.
The post-processing machine is the electrolytic copper foil surface treatment machine. The original foil passes through the surface treatment machine, and through the complex process tank and drive roller system, different process tanks are applied with different currents to obtain different functional layers on the surface of the copper foil to meet CCL, PCB, FCCL, FPC industry needs. Surface treatment machines are divided into copper foil surface treatment machines for CCL, PCB, FCCL, and FPC industries, and copper foil anti-oxidation models for simple lithium batteries
The transmission accuracy requirements of the raw foil machine and the post-processing machine are relatively strict. There are fine requirements from the selection of materials to the processing and assembly of equipment and accessories. A missed link will cause damage to the 6μm thick copper foil material. A large number of rubber rollers are used in the transmission of the production line, which has strict requirements on the accuracy of the roller body. It is required to pay attention to the processing details in the production process of the roller body, and strictly grasp every link in the production. The electrolytic copper foil adhesive layer usually uses EPDM adhesive and silica gel as the encapsulation material