Lithium-ion battery production process and 18650 battery bulk production equipment

　　Lithium-ion battery production process flow and 18650 battery bulk production equipment. The production technology of lithium-ion batteries is very strict and complex. The 18650 battery bulk production process has a long process and a lot of equipment. 18650 battery bulk equipment generally refers to various manufacturing equipment used in the production process of lithium batteries. 18650 battery bulk equipment has a significant impact on the performance and cost of lithium batteries and is one of the determining factors.

　　Lithium-ion battery production process flow

　　Lithium-ion batteries mainly consist of four parts: positive electrode, negative electrode, non-aqueous electrolyte and separator. Currently, the most commonly used lithium batteries on the market are lithium iron phosphate batteries and ternary lithium batteries. The cathode raw materials of the two are quite different, and the production process is relatively similar, but the process parameters need to change greatly.

　　In the production process of lithium-ion batteries, the main processes that need to go through are lamination, welding and cutting, which are three consecutive processes. Automated or semi-automated special machines are used. The connection and flow between the three processes require manual intervention and cannot To achieve continuous production, labor intensity is high, and the consistency of battery products cannot be guaranteed.

　　The production process of lithium batteries is long, with more than 50 processes in the production process, and more than 50 types of equipment are needed to complete the manufacturing of each process. The process links determine that 18650 battery bulk equipment is complex and highly specialized.

　　18650 battery bulk front-end production process: pole piece manufacturing is related to the core performance of the battery

　　The result of the 18650 battery bulk front-end process is to prepare the positive and negative electrode sheets of the 18650 battery bulk. The first step is stirring, that is, mixing the positive and negative solid-state battery materials evenly, adding the solvent, and stirring them into a slurry through a vacuum mixer. The mixing of ingredients is the basis for the subsequent 18650 battery bulk process, and high-quality mixing is the basis for the high-quality completion of the subsequent coating and rolling processes. The coating and rolling process is followed by slitting, where the coating is slit. If burrs are generated during the cutting process, there will be safety risks during subsequent assembly, electrolyte injection, and even battery use.

　　18650 battery bulk middle stage process flow: efficiency comes first, winding goes before lamination

　　In the 18650 battery bulk manufacturing process, the middle process is mainly to complete the forming of the battery. The main process includes sheeting, pole piece winding, die cutting, cell winding and lamination forming, etc. It is currently a fierce competition among domestic equipment manufacturers. A field that accounts for about 30% of the value of 18650 battery bulk production lines. At present, the cell manufacturing processes of power lithium batteries mainly include winding and lamination. The corresponding battery structures are mainly cylindrical, square, and soft-packed. Cylindrical and square batteries are mainly produced using the winding process, while soft-packed batteries are Mainly using lamination technology.

　　The corresponding front-end processes for winding and lamination production are pole piece production and die-cutting. Production includes welding the slit pole pieces/lugs, dusting the pole pieces, applying protective tape, wrapping the tabs, and winding or cutting to length, in which the winding pole pieces are used for subsequent fully automatic winding. The cut-to-length pole pieces are used for subsequent semi-automatic winding; the punched pole pieces are rolled and punched into shape for subsequent lamination processes.

　　18650 battery bulk back-end process flow: volume separation and formation is the core link

　　The back-end production process of lithium batteries mainly consists of four processes: volume separation, formation, testing and packaging and warehousing, accounting for about 35% of the value of the production line. Formation and volume separation are the most important links in the back-end process, and the formed batteries are activated and tested. Since the battery has a long charge and discharge test cycle, the value of the equipment is the highest. The main function of the formation process is to charge and activate the cells after liquid injection and encapsulation. The capacity dividing process is to test the battery capacity and other electrical performance parameters and classify them after the battery is activated. The formation and volume separation are performed by the formation machine and the volume separation machine respectively, usually by an automated volume separation and conversion system.

　　What are the 18650 battery bulk production equipment?

　　18650 battery bulk equipment refers to process equipment such as coating, slitting, lamination, winding, liquid injection, welding, and testing provided for 18650 battery bulk production. The specific production equipment is as follows:

　　1. Vacuum planetary mixer: Stir various battery materials evenly into a slurry.

　　2. Electrode coating machine: The stirred slurry is evenly coated on the metal foil. The coating thickness of the slurry is accurate to less than 3 microns.

　　3. Roller press: The coated pole pieces are further compacted to increase the energy density of the battery.

　　4. Pole piece slitting equipment: used for pole piece coating and slitting.

　　5. Ultrasonic welding conductive handle equipment: used for metal welding in winding and lamination processes.

　　6. Winding machine: wind the manufactured pole pieces into batteries.

　　7. Glove box: Ensure that the electrolyte and winding core are packaged together in a low humidity environment.

　　8. Liquid injection machine: ensures high-precision vacuum injection of electrolyte into battery packaging materials.

　　9. Formation test equipment: charge and activate the prepared battery to generate voltage and test the battery capacity at the same time.

　　In the future, the explosive growth of the new energy vehicle market will also continue to indirectly drive the rapid growth of 18650 battery bulk equipment. In addition, driven by the large-scale mass production of power batteries and the continuous improvement of battery safety performance, domestic 18650 battery bulk equipment has begun to gradually move away from imitating Japan and South Korea, showing a trend of quickly catching up with the international advanced level or even surpassing it.

　　After the rapid development of domestic 18650 battery bulk equipment in recent years, the performance and quality have been greatly improved. At present, domestic equipment has been greatly improved in terms of speed, control accuracy and stability, and can basically meet the needs of battery companies. The overall demand is improving.

　　Summary: The quality of lithium batteries is crucial. The main problem in the current domestic lithium-ion battery industrialization is poor battery quality consistency. To fundamentally solve the problem of poor quality consistency in batch production of lithium-ion batteries, we must also improve the control accuracy of production equipment and the level of automation of the production line. Drive 18650 battery bulk manufacturing enterprises to carry out technological upgrading and transformation, thereby promoting technological innovation and product upgrading of my country's 18650 battery bulk industry.

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