Lithium-ion battery manufacturing process, lithium battery production process flow. The production and manufacturing of lithium-ion batteries is a process that is closely connected with each process step. As we all know, the lithium battery production process is quite complex. After all, the safety performance of lithium-ion battery products is directly related to the lives and health of consumers. The specific steps of the lithium battery production process include positive electrode slurrying, negative electrode slurrying, positive electrode sheets, negative electrode sheets, steel case assembly, liquid injection and testing, and packaging.

　　Lithium-ion battery manufacturing process

　　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.

　　The production process of lithium-ion batteries is relatively complex. The main production process mainly covers the stirring and coating stage of electrode production, the winding liquid injection stage of cell synthesis, and the packaging and testing stage of chemical packaging. The value ratio is about (35~40 %): (30~35)%: (30~35)%. The differences mainly come from different equipment suppliers, differences in the proportion of imported/domestic products, etc. The process flow is basically the same, and the value ratio is biased but generally consistent with the ratio.

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

　　The result of the lithium battery front-end process is to prepare the positive and negative electrode sheets of the lithium battery. 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 lithium battery 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. Therefore, the front-end equipment in the lithium battery production process, such as mixers, coating machines, roller presses, slitting machines, etc., are the core machines of battery manufacturing and are related to the quality of the entire production line.

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

　　In the lithium battery 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 lithium battery 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. Since the winding process can achieve high-speed production of battery cells through rotational speed, but the speed that lamination technology can increase is limited, domestic power lithium batteries currently mainly use the winding process. Therefore, the shipment volume of winding machines is currently larger than that of lamination. film machine.

　　Lithium battery 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.

　　Lithium battery production process

　　Step 1 - Electrode Slurry Preparation

　　Mainly, the electrode active materials, binders, solvents, etc. are mixed together and thoroughly stirred and dispersed to form a slurry.

　　Step 2 - Coating

　　Evenly apply the slurry prepared in the first step to the current collector (aluminum foil or copper foil, etc.) with a specified thickness, and dry the solvent.

　　Step 3 - Pole piece punching

　　Cut the pole piece made in the previous step into the specified size and shape.

　　Step 4 - Lamination

　　Assemble the positive and negative electrode sheets and separator together, and after completing the glue application, the electrode core is formed.

　　Step 5 - Assemble the Soft Pack Battery

　　Put the pole core produced in the previous step into the aluminum-plastic film that has been punched, and complete top sealing, side sealing, etc. to form a soft-pack battery without liquid injection.

　　Step 6 - Injection

　　Inject the specified amount of electrolyte into the soft-packed battery cell. Of course, the battery core must be baked and filled with liquid in a low-humidity environment. Excessive moisture content is not good.

　　Step Seven - Battery Sealing

　　The gas inside the cell is extracted and sealed in a vacuum environment.

　　At present, lithium batteries are gradually replacing the original lead-acid batteries. The production process of lithium-ion batteries is not very consistent for each manufacturer. With the development of society, various industries have higher requirements for the power generation performance of lithium-ion batteries. Therefore, analyzing the production process and future development of lithium-ion batteries will be helpful for promoting lithium-ion batteries. development is of great significance.

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