The most popular consumer electronic products in recent years are TWS (true wireless Bluetooth) earphones, smart watches, smart speakers, etc. button batteries are generally composed of main control chips, batteries, flexible circuit boards and controllers, among which the cost of batteries accounts for about 10% ~ 20%. Take the airplads Pro as an example, it has three batteries: two earphones and one in the charging bin. The batteries in the earphones are new rechargeable button batteries. Compared with other electronic products, the button type battery in TWS earphones is a new type of rechargeable battery, and its processing technology is more difficult than the traditional disposable button type battery, so its value is higher.
The traditional button battery processing technology is resistance welding, which uses the thermal effect of the resistance to heat fuse the welding sheet and the battery case to form welding. Although this welding technology is convenient and low-cost, its disadvantages are also obvious. For example, it can only be used for welding of a single material, the welding marks are not beautiful, the size of the welding spot is not accurate and it is easy to oxidize and blacken, and the burr is large. In addition, during the operation process, there are many factors affecting the safety, such as the falling off of the welding strip and the drop of the battery voltage of the welding leg. Therefore, resistance welding is no longer suitable for the processing of new button batteries with high quality requirements.
The new button battery is generally applied to the circuit board in the process of processing, and pins need to be welded on its surface. According to the needs of different circuit boards, the forms of welding pins are often various. At the same time, the welding legs of new button batteries are complex and the resistance welding process is not professional. As the existing resistance welding technology can not meet the high-quality welding requirements of new button batteries, many button battery manufacturers focus on laser welding technology.
Laser welding technology Topsun laser Com can meet the diversity of processing technologies for button batteries, such as welding of different materials (stainless steel, aluminum alloy, nickel, etc.), irregular welding tracks, excellent welding appearance, solid welds, more detailed welding points and more accurate positioning welding areas. Not only that, laser welding can also make the product consistency high, reduce the damage to the battery, and avoid the waste of raw materials.
The wireless Bluetooth headset battery precision laser welding equipment developed by shangtuo laser adopts non-contact welding and the laser can reach micron level, so it is widely used on the chip. The main advantage of this process is that it can realize the interconnection of very small size, and the droplet size can be as small as several tens of microns; The tin material distribution and heating process are carried out at the same time, and the production efficiency is high.
Source: shangtuo laser
