What Is The Reason for The Explosion of Batteries When Laser Welding Is Used?

Power batteries often experience explosion and splashing during laser welding. There are many factors that can cause explosions, and the main reason is that the fiber core diameter is too small or the laser energy is set too high. It is not the slogan promoted by some laser equipment providers that 'the better the beam quality, the better the welding effect'. Good beam quality is suitable for overlay welding with large penetration depth. Finding suitable process parameters is the key to solving problems.

Common problems of laser welding machine in the welding process of power batteries:

1. In the welding of stainless steel battery components, both pulse and continuous laser welding can achieve good welding results; The welding difficulty of aluminum alloy is relatively high, and some problems may be encountered during the production process, such as raised or recessed welding surfaces and small air holes inside. This situation usually occurs due to high laser output power and fast welding speed during welding, or it may be affected by factors such as the cleanliness and purity of the material itself.

2. When welding battery components, the thickness is generally within 1.0mm, mostly in two plate thicknesses of 0.6mm and 0.8mm. Welding methods are mainly divided into side welding and top welding, and there will be some splashing generated during welding. The advantage of side welding is that it will not easily allow splashing to enter the inside of the shell, and the impact on the inside of the battery cell is minimal.

3. When laser welding aluminum, it is easy to produce protrusions, bubbles, etc., mainly due to laser power issues or small fiber core diameter. Although the welding effect of aluminum is also related to the cleanliness and stability of the material itself, the main factor is still the stability of laser power output. Fiber optic continuous laser welding machine, capable of stable power and continuous welding, can also easily weld aluminum materials with high reflectivity.

Factors affecting the quality of laser welding for power batteries:

There are many factors that affect the quality of laser welding. Some of them are highly volatile and have considerable instability. How to correctly set and control these parameters to ensure welding quality within an appropriate range during high-speed continuous laser welding process. The reliability and stability of weld formation are important issues related to the practicality and industrialization of laser welding technology. The main factors affecting the quality of laser welding are welding equipment, workpiece condition, and process parameters.

What are the reasons for the explosion of power battery laser welding? There are many factors that can cause a fire, such as the cleanliness of the material, the purity of the material itself, and the characteristics of the material itself, among which the stability of the laser plays a decisive role. Surface protrusions, air holes, and internal bubbles on the shell. The main reason is that the fiber core diameter is too small or the laser energy is set too high. So in order to reduce welding problems during the production process of power batteries, it is necessary to find equipment manufacturers with welding experience. If you want to learn more, you can follow us.

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