Lithium battery production process:

　　The first step--preparation of electrode slurry

　　is mainly to mix electrode active materials, binders, solvents, etc. together, stir and disperse sufficiently to form a slurry.

　　The second step-coating

　　The slurry prepared in the first step is uniformly coated on the current collector (aluminum foil or copper foil, etc.) with a specified thickness, and the solvent is dried.

　　The third step-pole piece punching

　　Punch the pole piece produced in the previous step into the specified size and shape.

　　The fourth step-stacking

　　Assemble the positive and negative plates and the separator together, and form the pole core after the glue is applied.

　　Step 5-Assemble the soft pack battery

　　Put the pole core produced in the previous step into the aluminum-plastic film that has been flushed, and complete the top seal, side seal, etc. (and leave a mouth for injection) to form a soft pack battery without injection.

　　The sixth step-injection

　　Inject a specified amount of electrolyte into the soft-pack battery cell. Of course, the battery cell needs to be baked, and the liquid injection operation is carried out in a low humidity environment, too much moisture content is not good.

　　Step 7-battery sealing

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

　　The production process of lithium batteries is relatively complicated. The main production process flow mainly covers the stirring and coating stage of electrode production (front stage), the winding and injection stage of battery cell synthesis (middle stage), and the packaging inspection stage of chemical packaging (back stage). The amount of value (purchasing amount) accounts for approximately (35~40%): (30~35)%: (30~35)%. The difference mainly comes from the different equipment suppliers, the difference in the ratio of imported/domestic products, etc. The process flow is basically the same, and the proportion of value is deviated, but the overall proportion is in line with this ratio.

　　The lithium battery equipment corresponding to the first process of lithium battery production mainly includes vacuum mixer, coating machine, roller press, etc.; the middle process mainly includes die cutting machine, winding machine, stacker, liquid injection machine, etc.; the latter process includes forming machine , Divided capacity testing equipment, process warehousing logistics automation, etc. In addition, the production of battery packs also requires Pack automation equipment.

　　The result of the front-end process of the lithium battery is to complete the preparation of the positive and negative plates of the lithium battery. The first step is stirring, that is, the positive and negative solid battery materials are mixed uniformly and then the solvent is added, and the vacuum mixer is stirred into a slurry. The mixing of ingredients is the basis for the follow-up process of lithium battery, and the high-quality mixing is the basis for the high-quality completion of the follow-up coating and rolling process.

　　The coating and rolling process is followed by slitting, that is, the slitting process is performed on the coating. If burrs are generated during the slitting process, subsequent assembly, electrolyte injection and other procedures, or even safety hazards during battery use, may occur. Therefore, the front-end equipment in the lithium battery production process, such as mixers, coating machines, roller presses, and slitting machines, are the core machines for battery manufacturing. They are related to the quality of the entire production line. Therefore, the value (amount) of the front-end equipment accounts for the entire lithium battery. The proportion of automated production lines is the highest, about 35%.

　　In the lithium battery manufacturing process, the middle process is mainly to complete the forming of the battery. The main process flow includes film making, pole piece winding, die cutting, cell winding forming and lamination forming, etc., which is currently fiercely competitive by domestic equipment manufacturers. One area accounts for about 30% of the value of lithium battery production lines.

　　At present, there are two main manufacturing processes for power lithium batteries: winding and lamination. The corresponding battery structures are mainly cylindrical and square, and soft packs. Cylindrical and square batteries are mainly produced by the winding process, while soft pack batteries are produced. The lamination process is mainly used. Cylinders are mainly represented by 18650 and 26650 (Tesla independently developed 21700 batteries and are now being promoted throughout the industry). The difference between the square and the soft package is that the outer shell is made of hard aluminum and aluminum-plastic film. The soft package is mainly laminated. Mainly, the aluminum shell is mainly wound.

　　The soft package structure is mainly oriented to the mid-to-high-end digital market. The profit rate per unit product is higher. Under the same production capacity, the relative profit is higher than that of aluminum shell batteries. Because aluminum shell batteries are prone to scale effects, product qualification rates and costs are easy to control, both currently have considerable profits in their respective market areas, and it is difficult for them to be completely replaced in the foreseeable future.

　　Since the winding process can achieve high-speed production of batteries through the speed, and the speed that can be improved by the lamination technology is limited, the current domestic power lithium battery mainly adopts the winding process, so the shipment volume of the winding machine is currently larger than that of the stack. Film machine.