Nowadays, wind energy and solar energy have become a kind of alternative clean energy, and their popularity has increased significantly. And we will also look at the next generation of power generation technology - fuel cell power generation. A fuel cell is very similar to a battery because it is also a device that converts chemical energy into electrical energy. However, unlike a battery, the chemical does not leak after the reaction. As a fuel cell, as long as we continue to provide fuel, the power will be continuously output. Most fuel cells today use hydrogen and oxygen for chemical reactions, so the resulting waste is essentially water or carbon dioxide. Fuel cells are used in a wide range of applications, such as consumer electronics, the automotive industry, residential power generation, and industrial power generation. The types of fuel cells are also diverse. The single-chamber fuel cell produces a voltage of approximately 0.7 V. However, in order to achieve a more desirable voltage, we usually combine many batteries to form a "fuel cell stack." There are many places where fiber laser welding can be applied in fuel cells: Bipolar plate Connecting device Fuel processor Heat exchanger Advantages of laser welding Very fast welding in continuous mode Very little heat generated in pulse mode Pulse or continuous mode has high weld quality Good power stability during soldering Weldable high reflectivity material Can weld defective materials Abnormal situation automatic control Large laser spot can be generated by defocusing method for soldering Pulse shaping capability Average power peak power compensation Application example – welding bipolar plates â—Stainless steel (SS304) sheet thickness 0.1-0.3mm â—The laser continuous welding length of fuel cells in the future will reach 400m â— Spot size 30-60mm The figure below shows the welding of different auxiliary gases at a speed of 200 mm/s. The figure below shows the laser welding capabilities for different situations. It is worth noting that the welding depth is actually not related to the auxiliary gas. We can change the parameters to suit different types of fuel cell welding according to the actual situation.
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Laser welding of fuel cells