Lithium battery mid-section process: efficiency first, winding before lamination High speed mold cutting machine

The production process of lithium battery

The lithium battery equipment corresponding to the front-end process of lithium battery production mainly includes vacuum mixers, coating machines, roller presses, etc.; the middle-stage processes mainly include die-cutting machines, winding machines, lamination machines, liquid injection machines, etc.; The latter-stage process includes chemical forming machines , Volumetric testing equipment, process warehousing and logistics automation, etc. In addition, the production of battery packs requires Pack automation equipment.

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

The result of the front-end process of the lithium ion battery is to prepare the positive and negative electrode sheets of the lithium ion battery. The first process is to stir, that is, to mix the positive and negative solid-state battery materials evenly, add a solvent, and stir into a slurry by a vacuum mixer. The stirring of ingredients is the basis of the subsequent process of lithium battery, and the high-quality stirring is the basis for the high-quality completion of the subsequent coating and rolling process.(High speed mold cutting machine)

Lithium battery mid-section process: efficiency first, winding before lamination

In the manufacturing process of lithium-ion batteries, the main process in the middle section is to complete the forming of the battery. The important technological processes include film production, pole piece winding, die cutting, cell winding forming and lamination forming, etc. Currently, the competition among domestic equipment manufacturers is relatively fierce. An area of ​​​​accounting for about 30% of the value of lithium-ion battery production lines.

At present, the main manufacturing processes of power lithium-ion batteries are winding and lamination. The corresponding battery structures are mainly cylindrical, square, and soft pack. Cylindrical and square batteries are mainly produced by winding process. Soft pack batteries The lamination process is mainly used.

The soft-pack structure is mainly for the mid-to-high-end digital market, and the profit rate per unit product is higher. Under the same output conditions, the relative profit is higher than that of aluminum shell batteries. Because aluminum shell batteries are easy to form scale effects, and the product qualification rate and cost are easy to control, both currently have considerable profits in their respective market fields, and it is difficult for them to be completely replaced in the foreseeable future.

Since the winding process can realize the high-speed production of cells through the rotation speed, and the lamination technology can improve the speed is limited, the current domestic power lithium-ion battery mainly adopts the winding process, so the shipment volume of the winding machine is currently more than Stacker.

The corresponding front process of winding and lamination production is the production and die-cutting of pole pieces. Production includes pole piece/pole lug welding after slitting, pole piece dust removal, sticking protective tape, pole lug wrapping and winding or cutting to length, wherein the winding pole piece is used for subsequent automatic winding, The cut-to-length pole piece is used for subsequent semi-automatic winding; the die-cut pole piece is to wind and punch the slitted pole piece for the subsequent lamination process.

In terms of lithium battery packaging and welding, the mainstream laser technology integrated application manufacturers of Lian Ying, Han's and Everbright are all involved, which can meet the needs and do not need to be imported.

Lithium battery back-end process: capacity division is the core link

The back-end production process of lithium batteries is mainly composed of four processes: volume separation, formation, testing and packaging and storage, accounting for about 35% of the value of the production line. Formation and volume distribution are the most important links in the back-end process, and the formed battery is activated and tested. Due to the long charging and discharging test cycle of the battery, the value of the equipment is the highest. The important use of the chemical formation process is to activate the battery cells after injection and encapsulation, and the capacity separation process is to test the battery capacity and other electrical performance parameters and classify them after the battery is activated. Formation and volume separation are respectively completed by the chemical forming machine and the volume dividing machine, which are usually completed by an automatic volume dividing and forming system.



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