Application Of Laser Welding In Button Cells

In recent years, with the development of electronic technology, 5G technology and artificial intelligence, global electronic products tend to be intelligent, thinner, wireless, and entertaining. TWS (True Wireless Bluetooth) headsets, smart watches, smart speakers, etc. these things create a new round of consumer demanding climax for the representative products. Among them, TWS headsets are undoubtedly the most concerned consumer electronics products in recent years.


Take TWS earphones as an example. The common ones usually have 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 disposable button batteries, which requires higher processing technology. The new type of rechargeable button battery is small because of its compactness. And the function of energy storage has also been widely used in the fields of consumer electronics, computers and peripherals, communications, vehicles, medical care, home use, and the Internet of Things.



The traditional button battery processing technology is to use the thermal effect of the resistance to heat the welding tabs and the battery shell to form a welding resistance welding. Although this welding technology is convenient and low-cost, its shortcomings are also obvious.


For example, it can only be used for single material welding, the weld mark is not beautiful, the size of the welding spot is not accurate, and it is easy to oxidize and turn black, and the front is large. The factors that affect the operation of equipment and personnel are relatively large, and it is easy to cause safety problems such as falling off of the solder tabs and drop of the battery voltage of the solder feet. Therefore, resistance welding is no longer suitable for the processing of new button batteries with high-quality requirements.



Laser welding technology can meet the variety of button battery processing technologies, such as welding of dissimilar materials (stainless steel, aluminum alloy, nickel, etc.), irregular welding tracks, excellent welding appearance, firm welds, more detailed welding points, and more Precise positioning of the welding area, etc. Not only that, laser welding can also make the product consistency high and reduce the damage to the battery, avoiding the waste of raw materials.



The laser welding process used in button battery welding has:


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


2. A variety of welding track graphics can be realized. Such as sine line shape, spiral line shape, spiral point shape, etc.;


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


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



In addition to the above handheld laser welding equipment, it can also be equipped with a production line to realize automatic feeding, automatic detection and sorting, and the automatic production function of button battery welding, assembly, bonding and automatic electrical detection through the robot combined with the laser equipment , To achieve high-quality, large-scale and flexible production of button batteries. The company's button battery equipment adopts modular design and professional design, with strong compatibility, high efficiency, low cost, short customization cycle, and rapid delivery.

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