According to industry insiders, in the first half of 2023, the leading enterprises of the lithium battery links are basically in full production, the whole industry chain demand high growth certainty, the second half of the boom will further enhance the new round of power battery investment and expansion dividend or last 3-5 years, while not only in the field of new energy vehicles, lithium batteries in 3C electronic products in the renewal is also facing Higher energy storage technology breakthrough.
And in the production and manufacturing process of lithium batteries a lot of use to laser technology, such as power battery pole piece pole ear welding, and laser marking technology in the lithium battery packaging tape, shell and other scenarios.
Application of laser technology in 3C consumer batteries - pole lug welding
In the production of consumer batteries, an electrode lug welding process is involved to weld the battery electrode lug to the collector lug. The positive material is aluminum welded to aluminum foil, and the negative material is nickel welded to copper foil. After the welding is completed, the wrap or stack is made into a battery, and many encapsulation techniques are applied to the actual production process of the battery: such as laser welding, resistance welding, ultrasonic welding, etc.
Suitable 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 to use ultrasonic welding, easy to form false welding, and the welding head is easy to form loss, and the loss time is unknowable, easy to lead to a large area of defective products.
UV nanosecond laser welding - heat affected area is smaller, better adhesion
Laser welding uses a laser beam as the energy source and uses a focusing device to gather the laser into a high power density beam to irradiate the surface of the workpiece for heating, which dissolves within the metal material to form a specific pool under the effect of heat transfer.
In the field of laser welding is subdivided into infrared fiber laser welding and ultraviolet nanosecond welding, where the infrared fiber laser welding, negative welding, if the use of spiral welding, the thermal impact will be large, if the spot welding, it is easy to produce false welding. Positive welding, if the use of spiral welding, it is difficult to weld up, while if the use of spot welding, and will form a lot of false welding.
And UV nanosecond welding, because the material absorption of UV light is very high, less difficult to weld, is currently the best welding effect, the highest welding efficiency of the light source, with a small heat-affected area, better adhesion, <2s welding a piece, high welding efficiency, welding joint tearing residue of more than 90% of the excellent performance.
Along with the deep development of new energy vehicles and a wide range of 3C electronic industry, the assembly and welding precision and quality of supporting batteries have raised higher requirements, and the future more sophisticated laser welding technology will further integrate with the field of power batteries in depth, and jointly 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 raw material information, production process and technology, product batches, manufacturers and dates, etc. How to effectively trace the entire lithium battery? The key information needs to be stored in the two-dimensional code on the battery for marking, and the traditional ink spray coding technology has problems such as easy friction, long time easy to lose information, while Innolux laser UV marking technology has the characteristics of strong permanence, high anti-counterfeiting, high precision, wear resistance, safety and reliability, etc., and will not fade after a long time because of environmental relations, which is a high-quality solution for battery industry marking.
