What laser technologies are used in the manufacturing process of lithium batteries?

What laser technologies are used in the manufacturing process of lithium batteries?

According to industry insiders, in the first half of 2021, the leading companies in all aspects of lithium batteries are basically in full production. The high demand growth of the whole industry chain is highly certain. The prosperity will be further improved in the second half of the year. A new round of power battery production expansion will be added. Or it may last for 3-5 years. At the same time, not only in the field of new energy vehicles, but also in the upgrading of 3C electronic products, lithium batteries are also facing technological breakthroughs in higher energy storage.

In the production process of lithium batteries, laser technology is widely used, such as the welding of power battery pole pieces, and the application of laser marking technology in lithium battery packaging tapes and casings.

Application of Laser Technology in 3C Consumer Battery-Tab Welding

In the production of consumer batteries, a pole piece welding process is involved, which welds the battery pole piece and the current collector piece together. The positive electrode material is welded between aluminum sheet and aluminum foil, and the negative electrode material is welded between nickel sheet and copper foil. After the welding is completed, it is wound or laminated to form a battery. Many packaging technologies are applied to the actual production process of the battery: such as laser welding, Resistance welding, ultrasonic welding, etc.

Appropriate welding methods and optimized process parameters play an important role in saving the production cost of power batteries and ensuring their uniformity and reliability. The traditional welding method is ultrasonic welding, which is easy to form a virtual weld, and the welding joint is prone to loss, and the loss time is unknown, which easily leads to large areas of defective products.

Ultraviolet nanosecond laser welding-small heat-affected area, better adhesion

Laser welding uses a laser beam as an energy source, and a focusing device is used to gather the laser beam into a high-power density beam to irradiate the surface of the workpiece for heating. Under the action of heat conduction of the metal material, the inside of the material melts to form a specific molten pool.

In the field of laser welding, it is further subdivided into infrared fiber laser welding and ultraviolet nanosecond welding. Among them, infrared fiber laser welding and negative electrode welding. If spiral welding is used, the thermal effect will be great. If spot welding is used, it is easy to produce false welding. For positive electrode welding, if spiral welding is used, it is difficult to weld it up. At the same time, if spot welding is used, a lot of false welding will be formed.

Ultraviolet nanosecond welding, due to the high absorption of ultraviolet light by the material, is less difficult to weld. It is the light source with the best welding effect and the highest welding efficiency at present. It has a small heat-affected area and good adhesion. It is less than 2s to weld one piece. High welding efficiency, excellent performance of solder joint tearing residue greater than 90%.

With the in-depth development of new energy vehicles and the extensive 3C electronics industry, higher requirements are put forward for the assembly and welding accuracy and quality of supporting batteries. In the future, more sophisticated laser welding technology will be further integrated with the power battery field. Explore the efficient and high-quality solutions of laser technology in different application scenarios.

Laser marking technology-effectively help power battery traceability

The production of batteries involves multiple links, including information on raw materials, production processes and processes, product batches, manufacturers, and dates. How to effectively trace the entire process of lithium batteries? The key information needs to be stored in the QR code to mark on the battery, while the traditional ink jet coding technology has problems such as easy friction and easy loss of information for a long time, while the Inno laser ultraviolet marking technology has strong permanent and anti-counterfeiting High performance, high precision, strong wear resistance, safety and reliability, etc., after a long period of time, it will not fade due to environmental relations. It is a high-quality solution for marking in the battery industry.