Introduction to the lithium battery manufacturing process and production raw materials. 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 batteries is relatively complicated. The editor of this article will introduce it in detail.

　　1. Lithium battery manufacturing process:

　　Lithium battery manufacturing process: three processes, front, middle and last, accounting for nearly 35%/30%/35%. The main production process mainly covers the stirring and coating stage of electrode production (front stage), the winding liquid injection stage of cell synthesis (middle stage), and the packaging and testing stage of chemical encapsulation (back stage). The value (purchase amount) accounts for approximately It is (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.

　　Objectively speaking, the lithium battery production process is divided into three major sections, one is pole piece production, the other is cell production, and the third is battery assembly. In the lithium battery production process, pole piece production is the foundation, battery core production is the core, and battery assembly is related to the quality of the finished lithium battery. 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 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. Therefore, the value (amount) of the front-end equipment accounts for the entire lithium battery production line. Automated production lines have the highest proportion, about 35%.

　　Lithium battery mid-stage process flow: efficiency first, winding 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.

　　Lithium battery back-end process flow: volumetric 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 Pack process: seemingly simple but needs to be combined with systematic design

　　The power battery pack system is a battery pack in which many individual cells are connected in series or parallel. It integrates battery hardware systems such as power and thermal management. Pack is the key to the production, design and application of power battery systems. It is the core link connecting upstream cell production and downstream vehicle applications. Usually design requirements are proposed by the cell factory or automobile factory, usually by the battery factory, automobile factory or third-party Pack The factory is completed.

　　2. Introduction to raw materials for lithium battery production:

　　The main raw materials for the production of lithium batteries include lithium cobalt oxide, lithium nickel oxide, lithium manganate, three raw materials, lithium iron phosphate, etc.

　　The main materials for lithium battery production include: positive electrode materials, negative electrode materials, separators, and electrolytes. It also includes other parts such as packaging. At present, the supply of lithium battery raw materials is sufficient, and the production capacity of some products is sufficient. Competition is fierce, and their market prices continue to fall. However, the production capacity of a small number of high-end products is insufficient, and the prices of high-end raw material products are too high. Overall, the lithium battery industry is still booming.

　　In fact, in the field of lithium battery cathode materials, any minor technological innovation is likely to set off a new round of market expansion. Chinese enterprises should strengthen the research and development of key cathode material technologies, achieve international leadership, and enhance core competitiveness. Gain an advantage in international competition.

　　It can be seen that all aspects of the lithium battery production process are closely related to product quality and safety. Each link in the lithium battery production process must be strictly and carefully managed in order to improve the safety performance of lithium battery products. . Lithium battery materials generally suffer from overcapacity in mid- to low-end products and short supply of high-end products. Lithium batteries are a new generation of green high-energy batteries with excellent performance and have become one of the focuses of high-tech development.

Read recommendations:

Ni-MH AAA600mAh 1.2V

Deeply understand the voltage of lithium ion battery

Energy density issues of new energy vehicle power batteries.18650 lithium battery cells

16340 battery manufacture

LR927 battery