Application of laser welding machine in welding of lithium battery

Do you know the welding application of laser welding equipment in cylindrical lithium battery?

Lithium batteries are divided into cylindrical lithium batteries, prismatic lithium batteries and soft pack lithium batteries according to their packaging methods. Although the market share of cylindrical lithium batteries has declined in the past two years, Tesla, the world's most influential new energy vehicle manufacturer, has adopted cylindrical batteries in its high-end products. Due to the high energy density, safety, reliability and low cost of cylindrical lithium batteries, large-capacity batteries have become the focus of efforts by major tram companies. Let's follow the editor of Huiyao Laser to learn about the welding application of laser welding equipment in cylindrical batteries.

 

The 4680 type electrodeless ear battery is a new type of battery released by Tesla. According to reports, the battery has a 5-fold increase in energy, a 16% increase in cruising range, and a 6-fold increase in power.

 

The welding of cylindrical lithium battery is mainly designed to the welding of cylindrical battery cap and the welding of cylindrical battery PACK module, so the welding process of cylindrical battery is relatively simple compared with that of square lithium battery. It is recommended to use Shangtuo Laser 1000W battery laser welding equipment. Customized fixtures meet your different welding requirements for cylindrical batteries. The welding of cylindrical cells is mainly used for the welding of the positive electrode. Since the shell of the negative electrode is thin, it is very easy to be welded through. For example, some manufacturers currently use the welding-free process for the negative electrode, and the positive electrode uses laser welding.

 

Difficulties and solutions for laser welding of cylindrical batteries:

Difficulty in welding:

The material is thin, easy to burn through, and the strength cannot be reached.

solution:

Control the consistency of incoming materials;

Design fixtures with excellent performance and control the clamping gap;

Use a small core fiber laser, and use a galvanometer to weld at high speed (above 300mm/s).

Welding difficulty two:

The penetration depth is required to be large, and the weld formation is poor.

solution:

The laser core is selected from 50μm to 100μm, and high power is used for high-speed (above 80mm/s) welding.

 

Laser welding effect of cylindrical battery cap

 

On the technical side, with the breakthrough of the all-pole ear process and the maturity of ternary/iron-lithium parallel technologies, the advantages of large cylindrical batteries in terms of high safety, high reliability, low cost, and mass production consistency become more and more obvious. . At the same time, the design, manufacture and even recycling of large cylindrical batteries can be standardized to a higher degree, which will also promote the secondary utilization market of batteries.

On the supply side, battery companies such as Yiwei Lithium Energy, Lishen, Honeycomb Energy, BAK, Panasonic, and LG are actively following up on large cylindrical batteries including 4680.

On the market side, in addition to Tesla, car companies such as Porsche, JAC, and Dongfeng Lantu have also successively released clear signals for the application of large cylindrical batteries. At the same time, in addition to the application in the field of electric vehicles, cylindrical full-tab batteries have also begun to be widely used in energy storage, power tools and other markets.

 

Huiyao Laser specializes in providing overall solutions for laser welding of lithium batteries. Laser processing has no pollution, small heat-affected zone, small deformation, fine laser welding spot, high penetration, high precision, and smooth welding surface without bubbles. The equipment has stable performance, easy operation, superior welding quality, and the welding path can be freely modified. It has a high degree of automation, simple operation and convenient maintenance, showing great advantages in the lithium battery welding process. Cylindrical batteries also have their own unique features, just like the rise of lithium iron phosphate batteries. In the future, its market share will become higher and higher.