Three advanced methods for intelligent manufacturing of lithium-ion battery electrodes

The advancement of automated lithium battery equipment has a positive impact on the power lithium-ion battery industry. In order to further optimize lean production, increase production, reduce costs, and save energy consumption, power lithium-ion battery companies continue to put forward new challenges to equipment companies. On December 20th, the 'Li Yuanheng·2018 Senior Engineer Lithium Battery u0026 Electric Vehicle Annual Conference' was successfully continued at Shenzhen Venus Royal Hotel. In the 'Cylindrical Battery Controversy' titled by Leiyu Technology on the morning of the 20th, Li Xiaoyun, general manager of Jinyhe Lithium Battery Equipment Division, delivered a keynote speech on 'Advanced Methods for Intelligent Manufacturing of Lithium Ion Battery Electrodes'. Jin Yinhe was established in 2002 and officially entered the field of lithium-ion battery equipment in 2009. In the lithium battery field, it is positioned as a supplier of lithium battery front-end intelligent equipment solutions. At present, the company mainly produces battery slurry spiral mixing automatic production lines, positive and negative electrode feeding systems, mixers, high-speed homogenizers, coating machines, roller pressing and slitting integrated machines and other lithium battery front-end automatic intelligent equipment. At the meeting, Li Xiaoyun discussed Jin Yinhe’s advanced methods in the three intelligent equipment of automatic slurry production line, double-sided extrusion coating machine, and stripe roller slitting machine, and seamlessly connected the three product combinations in the first stage. A wonderful sharing. The advancement of the automatic slurry production line lies in: the automatic screw slurry production line is suitable for dry and wet processes of various material systems. The main spiral runs at a speed of 600 rpm, but it can complete die-cutting, shearing and dispersing 10-12 per minute. Thousands of times, instant slurry function. The main machine is characterized by high hardness, high wear resistance, high corrosion resistance, and can be filtered for iron removal, and the dispersion is more uniform. The final consistency of the slurry is superior to that of the traditional mixer. This automatic production line launched SLG75 and SLG95 slurry spiral mixing automatic production lines in the lithium battery industry in 2013. The output of a single production line can reach 600L~2500L per hour. It is the first time in China to realize continuous online measurement of positive and negative materials and auxiliary materials. The function of delivering slurry to the double helix mixing device instantly. This equipment has been widely used in many power lithium-ion battery production companies in the industry. Up to now, 72 production lines have been operating normally, which is fully recognized by customers. At the same time, the advanced nature of the double-sided extrusion coating machine is: the efficiency is achieved in a 1 meter oven corresponding to a coating speed of 1.5-2.0m/min, which is related to the material characteristics and coating thickness, and the wide coating can reach 500-1300mm. In terms of quality accuracy, areal density≤±1%, cpk≥1.33. At the same time, the production efficiency of the double-sided extrusion pole piece coating machine is high. The output of one set is equivalent to the output of two single-sided coating machines; the floating double-sided drying at the same time, the drying system reduces energy consumption by 30-40% compared with single-sided coating ; Compared with the foldback double-sided extrusion coating machine, the equipment is simpler and easier to maintain and operate. The equipment occupies less space, and only uses the space of one single-sided coater to complete the output of two single-sided coaters. The utilization rate of the plant is high and the capital investment is reduced. Improve product quality, better than foldback coating uniformity. Eliminate heat-sensitive damage to the coating caused by repeated drying of single-sided coating. During the floating drying process, the pole piece is completely floating, there is no resistance to the transmission of the film path, and the tension of the film path is not increased, and high-speed coating of 80-100m/min can be achieved. Makes double-sided coating of special punched foil possible. The advanced nature of the roller slitting machine lies in: it truly solves the problem of wide stripe coating roller pressing and wrinkling, realizing high-speed continuous roller pressing, consistent and stable roller pressing surface density, improving production efficiency, and the speed can reach 100m/min. ; Suitable for continuous coating of positive electrode materials with ceramic edges in the middle of power lithium-ion batteries. This material is coated with ceramic on the white edges. The material is hard, and the non-coated white areas are prone to wrinkles during the rolling process. In order to solve the wrinkle problem, Jin Yinhe adopted the method of separating the tension before and after rolling, and added a front stretching and back stretching mechanism. After the coated coil is discharged from the unwinding machine, it enters the front stretching mechanism after rectification control, and then rolls, the material after rolling enters the post stretching mechanism, and the tension control before and after the rolling is independent of the unwinding and The winding tension is controlled separately to achieve the effect of no wrinkle after the pole piece is rolled. After rolling, the qualified pole piece is rolled or slitted and rolled to complete the rolling process.