Battery welding machine-Power battery laser welding equipment

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Release time：

2023-06-05

Laser welding has high energy density, small welding deformation and small heat-affected zone, which can effectively improve the accuracy of the parts, smooth and impurity-free weld seam, uniform and dense, without additional grinding work; secondly, laser welding can be precisely controlled, with a small focus spot, high-precision positioning, with the robot arm is easy to achieve automation, improve welding efficiency, reduce man-hours and reduce costs; in addition, thin plates or fine diameter wire, will not be as In addition, when welding thin plates or fine diameter wire, it is not as easy to suffer from reflow as arc welding. In addition, it can weld a wide range of materials and can realize the welding between different materials.

As the core component of new energy vehicles, the quality of the power battery directly determines the performance of the vehicle. Lithium battery manufacturing equipment is generally front-end equipment, mid-range equipment, back-end equipment, the equipment precision and automation level will directly affect the production efficiency and consistency of the product. And laser processing technology as an alternative to traditional welding technology has been widely used in lithium manufacturing equipment.
1、Battery explosion-proof valve welding
Battery explosion-proof valve is a thin-walled valve body on the battery sealing plate, when the internal pressure of the battery exceeds the specified value, the explosion-proof valve body rupture, to avoid the battery burst. The safety valve has a clever structure and this process requires a very strict laser welding process. Before the adoption of continuous laser welding, the battery explosion-proof valve was welded with pulsed lasers to achieve continuous seal welding by overlapping and covering the welding joints, but the welding efficiency was low and the seal was relatively poor. The use of continuous laser welding can achieve high speed and high quality welding, welding stability, welding efficiency and yield rate can be guaranteed.
2、Battery lug welding
The positive electrode of the battery is made of aluminum (Al), and the negative electrode is made of nickel (Ni) or nickel-plated copper (Ni-Cu). In the manufacturing process of power batteries, one of the parts is to weld the battery lugs to the poles. In the fabrication of the secondary battery it is necessary to weld it together with another safety valve made of aluminum. The welding should not only ensure a reliable connection between the pole lug and the pole post, but also require a smooth and beautiful weld.
3、Battery pole with spot welding
The materials used for the battery pole strip include pure aluminum strip, nickel strip, aluminum-nickel composite strip and a small amount of copper strip. With the emergence of IPG's QCW quasi-continuous laser, it has been widely used in the welding of battery strips. At the same time, due to its good beam quality and small welding spot, it has unique advantages in dealing with high reflectivity aluminum strips, copper strips and narrow strip battery strips (strip width below 1.5mm).
4, power battery shell and cover sealing welding
Power battery shell materials are aluminum alloy and stainless steel, of which the use of aluminum alloy is the most, generally 3003 aluminum alloy, there are a few pure aluminum. Stainless steel is the best material for laser weldability, either pulse or continuous laser are able to obtain the appearance and performance of good welds. Using continuous lasers to weld thin-shell lithium batteries, the efficiency can be increased by 5 to 10 times, and the appearance effect and sealing is better. Therefore there is a trend to gradually replace pulsed lasers in this application.