How to remove dust during the production process of laser die cutting

Whether it is the era of digital 3C lithium batteries or the explosive year of mass-produced power batteries, the burr and dust problems in the mold cutting process are considered by mold cutting equipment companies and battery companies to be obstacles to battery production.

As a key process after coating, the importance of mold cutting lies in the fact that the performance of the pole piece after cutting is related to the life and death of the entire battery, and even determines the safe use of the final application in the future. However, the burr and dust problems in the mold cutting process are considered by mold cutting equipment companies and battery companies to be obstacles to the era of digital 3C lithium batteries and the explosive year of mass-produced power batteries.

With the gradual development of power battery technology and market, lithium die cutting equipment has been replaced by hardware die cutting. Especially since 2016, many mainstream power battery companies have gradually reserved laser die cutting technology. Until the end of 2018, the laser die cutting circle broke out, and many die cutting equipment manufacturers and laser companies released laser die cutting products. The difficulty of solving burr and dust has also been upgraded accordingly.

1. Dust removal efficiency

Generally speaking, the dust problem of laser die cutting is concentrated on smoke and molten beads. After the laser burns, the smoke will produce many small particles. If these particles remain on the pole piece, they will directly affect the consistency and safety of the battery. For example, the integrity of the pole piece is affected by the later winding process. If the particles are too large, it is even easy to penetrate the diaphragm, or penetrate the diaphragm during charging and discharging, causing internal short circuits, high temperatures, and even explosions in the battery.

The amount of dust generated during laser cutting is also related to the quality of the foil used by battery companies. For mold cutting equipment companies, the process parameters of cutting power and laser power are different for different thicknesses and qualities. For example, the power for cutting aluminum foil and coated aluminum foil is different, and the specific parameter values require equipment companies to conduct a lot of experiments and verifications.

Take 6渭m lithium copper foil as an example. In theory, the thinner the copper foil, the easier it is to cut. But in actual operation, this challenges the tension control in the die cutting equipment. The thinner the copper foil, the tension after curling must be controlled within an appropriate range. If the strength is too small, the copper foil cannot be stretched, which hinders the cutting quality; if the copper foil quality is not high, it is easy to break the foil.

2. The maximum slicing rate is 80m/mi

At present, hardware die cutting still occupies a mainstream position in power battery production. However, in order to adapt to the overall trend of automated, intelligent and flexible production of power batteries in the future, hardware die cutting has reached the upper limit of production efficiency, and the mold cost is unaffordable for battery companies. For this reason, laser die cutting appears at a historic moment. Compared with traditional hardware die cutting, the production efficiency of laser die cutting can be doubled. In the long run, the production cost is greatly reduced.

Among them, the single-piece die cutting efficiency exceeds 150ppm, the continuous multi-ear die cutting is more than 30m/min, and the die life exceeds 1 million times; laser die cutting has the ability to mass produce 40m/min, 60m/min, and 80m/min, and the 40m/min laser die cutting machine has been supplied in batches.

3. Integrated high-mode cutting machine or die-cutting machine has been shipped

Automatic segmented packaging is the actual demand of current power battery companies. In addition to providing customers with stand-alone laser die-cutting equipment, LaiSe Laser also integrates die-cutting machines with slitting machines and slitting machines to launch die-cutting machines and die-cutting machines, optimizing equipment production process and control, greatly reducing equipment production cycle, reducing costs and improving production efficiency

4. Highly intelligent

Laiser Laser's various equipment products have realized intelligent operation, integrating CCD detection, multi-axis manipulator, PLC control and upper control, so that the die cutting machine can be smoothly connected with the intelligent processing system; it has intelligent equipment life cycle management, MES system monitoring and comprehensive control capabilities of die cutting equipment, with a high degree of intelligence and greatly reduced equipment operation error rate.