Application of automatic laser soldering machine for small laser marking machine wireless bluetooth headset battery

The appearance of batteries may be much earlier than we remember, and it can even be traced back to the Parthian kingdom in the Middle East more than 2,000 years ago. At that time, people used a clay pot filled with vinegar, and an iron rod wrapped with copper was fixed in the pot to generate a voltage of several volts. This is also the earliest recorded battery invention. Nowadays, there are various types of batteries, including lithium batteries, accumulators, AA batteries or AA batteries, etc. Today, Bot Laser will introduce a new type of laser welding application of button batteries.

Represented by TWS (True Wireless Bluetooth) headsets, smart watches, smart speakers, etc., the consumer electronics products that have received the most attention in recent years, button batteries are generally composed of main control chips, batteries, and flexible circuits. It consists of a board and a controller, of which the battery cost accounts for about 10% to 20%. Taking Airpods Pro as an example, it contains three batteries: two earphones and one in the charging compartment. The batteries in the earphones are new rechargeable button batteries. Compared with other electronic products, the button battery in the TWS headset is a new type of rechargeable type, and its processing technology is more difficult than the traditional one-time button battery, so the value is higher.

The traditional coin cell processing technology is resistance welding, which uses the thermal effect of resistance to thermally fuse the solder tab and the battery shell to form welding. Although this welding technology is convenient and low-cost, it has obvious disadvantages, such as only single material welding, unsightly welding marks, inaccurate size of welding spots, easy oxidation and blackening, and large flares. 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.

The new button battery is generally applied to the circuit board during the processing, and pins need to be soldered 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 feet of the new button battery are more complicated, and the resistance welding process is not very professional. The existing resistance welding technology cannot meet the high requirements of the new button battery. Quality welding requirements, many button battery manufacturers turn their attention to laser welding technology.

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, firm welds, more detailed welding points 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. Since its establishment in 2014, Bot Laser has made remarkable achievements in the field of non-metallic material welding. As the first laser soldering equipment manufacturer in China, it has made remarkable achievements in the research and development of button battery laser welding processing technology.

The advantages of automatic laser soldering process for wireless Bluetooth headset batteries are as follows:

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

2. Various welding trajectory patterns can be realized. Such as sinusoidal, helical, helical point, etc.; In the case of point size, a larger contact area can be obtained, and the weld strength and tensile force are larger;

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.