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At present, there are two important manufacturing processes for power lithium batteries: winding and lamination. The corresponding battery structure forms are cylindrical, square, and soft pack. Cylindrical and square batteries are mainly produced using winding technology, while soft pack lithium batteries are mainly produced using lamination technology. The cylindrical packaging is represented by 18650 and 26650 (Tesla has independently developed 21700 batteries and is promoting them throughout the industry). The difference between square and soft packaging is that the outer shell is made of hard aluminum shell and aluminum plastic film, respectively. The soft packaging is mainly made of lamination technology, while the aluminum shell is mainly made of winding technology.

The structural form of soft bags is important for the mid to high-end digital market, with a high profit margin per unit product. Under the same production conditions, the relative profit is higher than that of aluminum shell batteries. Due to the scale effect that aluminum shell batteries can easily form, the product qualification rate and cost are easy to control, and both currently have considerable profits in their respective market areas. In the foreseeable future, it is difficult for both to be completely replaced.

Due to the fact that the winding process can achieve high-speed production of battery cells through rotational speed, while the speed that can be improved by lamination technology is limited, currently the winding process is mainly used for power lithium batteries in China. Therefore, the shipment volume of the winding machine is currently greater than that of the lamination machine.

The previous process corresponding to winding and lamination production is the production and die-cutting of polar plates. Production includes welding of cut electrode plates/ears, dust removal of electrode plates, application of protective tape, wrapping of electrode ears, and winding or fixed length cutting. The winding electrode plates are used for subsequent fully automatic winding, and the fixed length cutting electrode plates are used for subsequent semi-automatic winding; Punching and cutting of electrode plates is the process of winding and punching the cut electrode plates into shape for subsequent lamination processes.

In terms of lithium battery packaging and welding, mainstream laser technology integration and application manufacturers such as Lianying, Daizu, and Guangda are all involved, which can meet the demand without the need for imports.

Lithium battery rear stage process flow: partial capacity conversion is the core link

The production process of lithium battery in the later stage is mainly divided into four processes: volumetric separation, formation, testing, and packaging, accounting for approximately 35% of the production line value. Formation and capacitance, as the most important steps in the later stage of the process, activate and detect the formed battery. Due to the long charging and discharging testing cycle of the battery, the value of the equipment is the highest. The important use of the formation process is to charge and activate the cells after liquid injection packaging, while the volumetric process tests the battery capacity and other electrical performance parameters after activation and grades them. Formation and separation are usually completed by automated separation and separation systems, respectively.

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