Laser welding equipment in aluminum shell battery module welding advantages and disadvantages

At present, the battery shell made of aluminum alloy accounts for more than 90% of the whole power battery. The difficulty of welding lies in the high reflectivity of aluminum alloy to laser light and high sensitivity to porosity during welding. Problems and defects inevitably occur during the welding process, the most important of which are porosity, thermal cracks and explosion.battery pilot line In power battery welding, SCOPE laser can provide free sample testing service. During the welding process, our welding technicians will select the appropriate laser and welding process parameters, including welding speed, waveform, peak, tip inclination, etc., according to the customer's requirements for battery material, shape, thickness and tension, and set reasonable welding process parameters to ensure that the final welding effect meets the requirements of power battery manufacturers.

Laser welding raw in the battery welding welding advantages are as follows:

1. Concentrated energy, high welding efficiency, high processing accuracy, weld depth to width ratio. The laser beam is easy to focus, align and be guided by optical instruments, and can be placed at an appropriate distance from the workpiece, and can be redirected between fixtures or obstacles around the workpiece.laser welding machine for lithium ion batteries Due to the space constraints mentioned above, other welding rules do not work.

2. Small heat input, small heat-affected zone, small residual stress and deformation of the workpiece; welding energy can be accurately controlled, welding effect is stable, welding appearance is good; non-contact welding, fiber optic transmission, accessibility is better, the degree of automation is high. When welding thin materials or fine diameter wires, it is not easy to have the trouble of melting back like arc welding.ESS lithium battery machine For power battery cells due to follow the principle of "lightweight", usually use a "light" aluminum material, but also need to do more "thin", the general shell, cover, bottom of the basic requirements The general shell, cover and bottom are basically required to reach 1.0 mm or less, the mainstream manufacturers of basic material thickness of 0.8 mm or so.

3. It can provide high strength welding of various material combinations, especially when welding copper and aluminum materials. It is also the only technology that allows nickel-plated welding to copper.

Laser welding equipment is difficult to weld in different types of battery modules;

Welding of soft pack lugs requires high demands on the welding fixture, which must press the lugs tightly to ensure the welding gap. It can realize high-speed welding of complex trajectories such as S-shape and spiral, increase the bonding area of the weld, and improve the welding strength.

Cylindrical core welding is mainly used for positive pole welding. Because the shell of the negative electrode is very thin, it is easy to weld through. For example, some manufacturers are currently using the negative electrode-free welding process, laser welding positive electrode.

Square battery technology combinations can be welded when the pole column or connecting piece of the contaminated thick, welding equipment connecting piece of the contaminant decomposition, easy to form a welding blow-up point, resulting in these holes; pole column is thin, under the plastic or ceramic material structural parts of the battery, easy to weld through. When the pole is small, it is also easy to weld bias to the plastic burnout, forming a blowout point. Do not use a multi-layer connection piece, there are holes between the layers, not easy to weld. Square battery welding construction process the most important process is the shell cover encapsulation, according to their own position is divided into the top cover and bottom cover welding. Some of the impact of the battery car manufacturers at the same time due to the social production of the battery system volume change is not large, the use of "deep drawing" process design and manufacture as well as the battery shell, only our top cover welding.

Laser welding is the main method of high-end battery welding, but there are many factors affecting the quality of laser welding, and the choice of laser welding equipment manufacturers is even more important, it is recommended that customers in the choice of laser welding equipment manufacturers, according to their own welding requirements to select the welding requirements and welding requirements to match the configuration, rather than choosing low-cost products. And need to consider the laser equipment manufacturer's after-sales service capabilities.