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Application of laser welding machine in precision welding of button battery

In recent years, with the development of electronic technology, 5G technology and artificial intelligence, global electronic products tend to develop in the direction of intelligence, thinness, wireless, entertainment, etc., with TWS (True Wireless Bluetooth) headphones, smart watches, smart speakers, etc. Create a new round of electronic consumer demand for the representative products. Among them, TWS earphones are undoubtedly the most concerned consumer electronic products in recent years.

Taking TWS earphones as an example, there are usually 3 batteries, two earphones and one charging compartment. Because it is a new type of rechargeable button battery, compared with other products, the processing difficulty is higher than that of the disposable button battery, which requires higher processing technology. The new type of rechargeable button battery is because of its small size And the function of energy storage has also been widely used in consumer electronics, computers and peripherals, communications, automotive, medical, household, Internet of Things and other fields.

The traditional button battery processing technology is to use the thermal effect of resistance to thermally fuse the solder tab and the battery shell to form a resistance welding. Although this welding technology is convenient and low-cost, its disadvantages are also obvious, such as it can only be used for single-material welding, the welding marks are not beautiful, the size of the welding spot is inaccurate, easy to oxidize and blacken, and the front is large. It is greatly affected by equipment and personnel operations, and it is easy to cause safety problems such as the falling off of the solder tab and the drop of the battery voltage of the solder pin. Therefore, resistance welding is no longer suitable for the processing of new button batteries with high quality requirements.

Laser welding technology can meet the processing technology diversity of button batteries, such as welding of dissimilar materials (stainless steel, aluminum alloy, nickel, etc.), irregular welding trajectory, excellent welding appearance, strong welding seam, finer welding point and more. Precise positioning of welding areas, etc. Not only that, laser welding can also make the product more consistent and reduce the damage to the battery, avoiding the waste of raw materials.

Laser welding process applied to button battery welding has:

1. Higher energy density makes it easier to reach the material absorption threshold (especially for highly reflective materials, the advantages are more obvious);

2. Various welding trajectory graphics can be realized. Such as sine line, spiral line, spiral point shape, etc.;

3. The welding spot is smaller, the aspect ratio of the welding seam is larger, a larger contact area can be obtained under the same size of the welding spot, and the welding seam strength and tensile force are greater;

4. Higher power density. Its welding principle is different from the traditional welding principle based on large molten pool, and is more similar to the welding effect of inlay, which can obtain higher weld strength, especially in the welding of dissimilar materials, which can reduce the generation of brittle compounds.

In addition to the above hand-held laser welding equipment, it can also be equipped with a production line to realize automatic feeding, automatic detection and sorting, and fully automatic production functions of button battery welding, assembly, lamination and automatic electrical testing through robotic arms combined with laser equipment. , can achieve high-quality, large-scale and flexible production of button batteries. The company’s button battery equipment adopts modular design, professional design, strong compatibility, high efficiency, low cost, short customization cycle, and can achieve rapid delivery

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