Hailei Laser Highlights Key Welding Applications Driving NEV Lithium Battery Manufacturing

As the global transition toward new energy vehicles (NEVs) accelerates, the manufacturing of core lithium batteries has become a critical focal point for the industry. Interestingly, laser welding technology for battery applications was already being utilized well before electric vehicles became mainstream. Today, as production demands scale, advanced laser welding machines are playing an indispensable role in ensuring battery safety and performance. Industry experts at Hilei Laser have highlighted the primary applications of this technology in modern NEV lithium battery production.

One of the most vital applications is battery tab welding. Battery tabs typically consist of aluminum (Al) for the positive electrode, and nickel (Ni) or copper-plated nickel (Ni-Cu) for the negative electrode. During the manufacturing of power lithium batteries, these tabs must be securely welded to the battery terminals. In secondary battery assembly, they are also integrated with aluminum safety valves. This precise process not Pre-requires highly reliable electrical connections but also demands smooth, aesthetically pleasing weld seams to meet rigorous quality standards.

Another crucial stage is power battery module and pack assembly, where series and parallel connections are established by welding connecting strips to individual cells. Because direct laser welding between dissimilar metals like copper and aluminum creates brittle intermetallic compounds that fail to meet performance requirements, ultrasonic welding is generally reserved for those specific transitions. However, for same-metal joints such as copper-to-copper and aluminum-to-aluminum, laser welding remains the industry standard. Given that both copper and aluminum possess high thermal conductivity and extreme reflectivity to laser beams—and considering the relatively thick nature of connecting strips—high-power lasers are essential to ensure deep penetration and stable, consistent welds.

To support these demanding manufacturing processes, Hailei Laser continues to lead with a comprehensive portfolio of industrial laser equipment. The company’s extensive lineup includes laser marking machines, advanced laser welding systems, precision spot welders, cutting machines, tube cutters, and cleaning machines. Backed by a team of highly skilled professionals, Hilei Laser delivers robust technical expertise and exceptional operational efficiency, empowering manufacturers to meet the evolving challenges of the new energy sector.