Laser welding is widely used in the new energy lithium battery industry

Laser welding has always been an indispensable process in the lithium battery manufacturing process. From stainless steel shells to aluminum shells to polymers, laser welding is widely used. With the continuous development of the industry, higher requirements are put forward for the efficiency and quality of laser welding, and the use of optical fiber transmission laser welding is started. Due to the flexible connection between the welding machine host and the focusing head, this method is easier to match with the assembly line, Realize full automation. The appearance and performance of welding have also been significantly improved.

Lithium-ion batteries are widely used in various electronic devices (such as mobile phones, notebook computers, PDAs, digital cameras, digital video cameras, etc.) because of their high specific energy, long cycle life, low self-discharge, no memory effect, and no pollution. As well as transportation tools (patrol cars, electric bicycles, electric vehicles, etc.), it has become a high-tech industry supported by my country's energy sector.

Power battery refers to the battery used in electric vehicles. Compared with small-capacity batteries (such as mobile phones, laptop batteries, etc.), it has larger capacity and output power and can be used in electric vehicle driving power and large mobile power applications.

Secondary battery. There are many manufacturing processes for lithium-ion batteries or battery packs, and there are many processes, such as explosion-proof valve sealing welding, tab welding, soft connection welding, safety helmet spot welding, battery shell sealing welding, module and PACK welding. Take the laser welding machine as the process. The materials used for welding of power batteries are mainly pure copper (chemical formula Cu), aluminum (Al), aluminum alloy, and stainless steel.

The laser welding machine has the characteristics of high positioning accuracy, simple operation, CNC programming or teaching mode, simple and easy to understand, high welding depth ratio, high speed, flat, beautiful, and small width of the weld, no need to handle after welding, and high weld quality. The whole machine has a split design, modular structure, and quick fixture replacement. The equipment has high utilization rate and can weld a variety of products. It is suitable for combined applications in various industries and can be used for assembly line operations to improve quality and efficiency. The three-dimensional workbench and fully customized fixture can be controlled by industrial computer or PLC, and can provide a variety of solutions for the needs of different industries.

The following is the process application of laser welding in the lithium battery industry summarized by Huiyao Laser for everyone:

1. Welding of battery explosion-proof valve

The explosion-proof valve of the battery is a thin-walled valve body on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the valve body of the explosion-proof valve ruptures to prevent the battery from bursting. The safety valve (function: the control pressure does not exceed the specified value) has an ingenious structure. This process has extremely strict requirements on the laser welding process. Before the continuous (Continuity) laser welding, the battery explosion-proof valve was welded by pulse laser welding. The welding point and the welding point were overlapped and covered (Cover) to achieve continuous sealing welding, but the welding efficiency was low and the airtightness Relatively poor. Continuous laser welding can achieve high-speed and high-quality welding, and welding stability, welding efficiency and yield can be guaranteed.