The Main Production Process of Lithium Batteries
With the development of science and technology, lithium batteries have become an indispensable part of our daily life. From mobile phones, laptops to electric vehicles, lithium batteries are used everywhere. To produce high-quality lithium batteries, it is necessary to go through multiple processes such as the front section, middle section, and back section, and each process is inseparable from the support of various equipment.
Lithium batteries can be divided into cylindrical batteries, square batteries, and soft-pack batteries according to their shapes. There are certain differences in their production processes, but overall the lithium battery manufacturing process can be divided into the front section process (pole sheet manufacturing), the middle section process (cell synthesis), and the back section process (formation packaging). Due to the high safety performance requirements of lithium-ion batteries, the accuracy, stability and automation level of lithium battery equipment are extremely high in the battery manufacturing process.
The production goal of the front section process is to complete the manufacture of (positive and negative) pole sheets. The main processes of the front section process are: stirring, coating, rolling, slitting, film making, and die cutting. The equipment involved mainly includes: mixer, coating machine, roller press machine, slitting machine, film making machine, die cutting machine, etc.
The production goal of the middle process is to complete the manufacture of the battery cell. Its essence is the assembly process. Specifically, the (positive and negative) electrode sheets made in the previous process are assembled in order with the diaphragm and electrolyte. Due to the different energy storage structures of square (rolled), cylindrical and soft-pack batteries, there are obvious differences in the technical routes and production line equipment of different types of lithium batteries in the middle process.
Specifically, the main processes of the middle process of square and cylindrical batteries are: winding, liquid injection, and packaging. The equipment involved mainly includes: spot winding machine, electrolyte injection, rolling press machine, sealing machine, etc.; the main processes of the middle process of soft-pack batteries are: stacking, digital filling , and packaging. The equipment involved mainly includes: stacking machine, digital filling machine, packaging equipment, etc.
The production goal of the back-end process is to complete the formation and packaging. By the middle process, the functional structure of the lithium battery cell has been formed. The significance of the back-end process is to activate it, and after testing, sorting, and assembly, it will form a lithium battery product that is safe to use and has stable performance. The main processes of the later stage are: formation, capacity division, testing, sorting, etc. The equipment involved mainly includes: battery charging discharging tester, battery cell testing equipment, etc.
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