Date: 2024-07-05 hits: 240
The optimization and innovation of lithium battery cell manufacturing process is of great significance to improve the performance of lithium battery, reduce the cost and improve the production efficiency. This article will discuss the innovation and development of lithium battery cell manufacturing process from the aspects of key process optimization, technological innovation and breakthrough, and future development trend.
A. Optimization of key processes
1. Electrode sheet preparation
Electrode sheet preparation is one of the key links of lithium battery cell manufacturing, and its quality directly affects the performance of the battery.
At present, the electrode sheet is mainly prepared by coating process, that is, the positive electrode material and the negative electrode material are respectively coated on the metal foil. In order to improve the coating quality and efficiency, the researchers continue to optimize the coating process parameters, such as coating speed, coating thickness, coating temperature, etc.
Using advanced coating equipment, such as slit coater, scraper coater, etc.
2. Cell winding/Lamination
The cell winding/lamination is one of the key processes to assemble the pole pieces of the cell into the cell.
At present, cell winding/lamination mainly adopts two methods: winding process and lamination process. The winding process is to wind the electrode sheet into a cylindrical cell, which has the advantages of high production efficiency and low cost. The lamination process is to stack the electrode pieces into square cells, which has the advantages of high energy density and low internal resistance. In order to improve the quality and efficiency of cell winding/lamination, researchers continue to optimize the winding/lamination process parameters, such as winding speed, winding tension, and the number of lamination layers. Adopt advanced winding/laminating equipment, such as automatic winding machine, automatic laminating machine, etc.
3. Cell welding
Cell welding is one of the key processes to connect the electrode sheet with the cell shell. At present, the cell welding mainly uses laser welding, ultrasonic welding and other ways. Laser welding has the advantages of fast welding speed, high welding quality and small welding heat affected zone. Ultrasonic welding has the advantages of high welding efficiency, low welding cost and no pollution. In order to improve the quality and efficiency of cell welding, researchers continue to optimize welding process parameters, such as welding power, welding speed, welding pressure and so on.
The use of advanced welding equipment, such as automatic laser welding machine, automatic ultrasonic welding machine, etc., can also improve the quality and efficiency of welding.
4. Cell injection
Liquid injection is one of the key processes to inject electrolyte into the cell. At present, the battery cell injection mainly uses vacuum injection, normal pressure injection and other methods. Vacuum injection has the advantages of fast injection speed, high injection quality, good injection uniformity, etc. Normal pressure injection has the advantages of low injection cost and simple injection operation. In order to improve the quality and efficiency of cell injection, the researchers continue to optimize the injection process parameters, such as injection speed, injection pressure, injection temperature, etc.
Advanced injection equipment, such as automatic vacuum injection machine, automatic atmospheric pressure injection machine, etc., to improve the quality and efficiency of injection.
5. Cell packaging
Cell packaging is one of the key processes for assembling cells into batteries. At present, the cell packaging mainly uses aluminum-plastic film packaging, steel shell packaging and other ways. Aluminum-plastic film packaging has the advantages of light weight, good sealing and high safety. Steel shell package has the advantages of high strength, good impact resistance and low cost. In order to improve the quality and efficiency of cell packaging, researchers continue to optimize the packaging process parameters, such as packaging temperature, packaging pressure, packaging time and so on. Using advanced packaging equipment, such as automatic aluminum-plastic film sealing machine, automatic steel shell sealing machine, etc., to improve the quality and efficiency of packaging.
B. Technological innovation and breakthrough
1. Precision manufacturing technology
Precision manufacturing technology is one of the key technologies to improve the manufacturing accuracy and consistency of lithium battery cells.
At present, precision manufacturing technology mainly includes coating technology, winding/laminating technology, welding technology, liquid injection technology and so on. By optimizing the process parameters of these technologies and adopting advanced equipment, the dimensional accuracy and consistency of the cell can be improved to improve the performance and safety of the battery.
2. New packaging technology
New packaging technology is one of the key technologies to improve the quality and reliability of lithium battery cell packaging.
At present, the new packaging technology mainly includes heat sealing technology, ultrasonic packaging technology, laser packaging technology and so on.
These technologies have higher sealing performance and lower energy consumption, which provides a strong guarantee for the safety and reliability of the cell.
3. Intelligent manufacturing technology
Intelligent manufacturing technology is one of the key technologies to improve the manufacturing efficiency and quality stability of lithium battery cells.
At present, intelligent manufacturing technology mainly includes automated production equipment, intelligent control systems, industrial Internet and so on. Through the introduction of these technologies, the automation, intelligence and information of the cell manufacturing process can be realized, and the production efficiency and quality stability can be further improved.
4. Application of new materials
The application of new materials is one of the key technologies to improve the performance of lithium battery cells and reduce costs.
At present, the application of new materials mainly includes positive electrode materials, negative electrode materials, electrolyte, diaphragm, etc., through the development and application of new materials, improve the energy density, cycle life, safety and other properties of the battery cell and reduce costs.
C. Future development trend
1. Green manufacturing
Green manufacturing is one of the important development directions of lithium battery cell manufacturing in the future. The use of environmentally friendly materials, energy-saving equipment and recycling technology to reduce energy consumption and emissions in the production process to achieve green and sustainable production.
2. Flexible manufacturing
Flexible manufacturing is one of the important development directions of lithium battery cell manufacturing in the future. The introduction of modular, reconfigurable production lines can realize the rapid switching and production of different specifications and different types of cells to meet the diversified needs of the market.
3. Intelligent manufacturing
Intelligent manufacturing is one of the important development directions of lithium battery cell manufacturing in the future, the introduction of artificial intelligence, big data and other technologies can achieve intelligent monitoring, fault diagnosis and optimization control of the production process, improve production efficiency and quality stability.
4. High-performance manufacturing
High-performance manufacturing is one of the important development directions of lithium battery cell manufacturing in the future. Continuous improvement of the energy density, cycle life, safety and other performance of the battery cell can meet the demand for high-performance batteries in fields such as new energy vehicles and mobile electronic devices.
