How many kinds of welding methods are there for lithium ion batteries?

(1) Wave crest welding: in essence, ultrasonic welding and laser welding combined;

(2) Ultrasonic welding: the advantages of this method are simple welding, but to occupy more space, the module volume group efficiency will be low;

(3) Laser welding: at present, this method is the most widely used, but the structure is slightly different;

(4) Dissimilar metal laser welding: This type of welding group efficiency is also high, the production speed is fast.

Application of laser welding in lithium ion battery industry

Laser welding takes laser beam as the energy source, and uses the focusing device to make the laser gather into a beam of high power density to irradiate on the workpiece surface for heating. In the heat conduction of metal materials, the internal material melts to form a specific solution pool. When laser welding is used, the heat affected zone of the workpiece is small. Small solder joint, high precision welding size; The welding mode belongs to non-contact welding, without external force, the product deformation is small; High welding quality; High efficiency, easy to automate production.

The shell materials of power lithium battery are aluminum alloy and stainless steel, among which aluminum alloy is used the most, generally 3003 aluminum alloy, there are a few pure aluminum. Stainless steel is the best laser weldability material, especially 304 stainless steel, whether pulse or continuous laser can obtain good appearance and performance of the weld.

With the development of technology and technology, laser as a non-contact flexible manufacturing tool will become more and more obvious. Laser manufacturing is bound to become convenient and efficient, green environmental protection, energy saving advanced manufacturing technology, promote our industrial field of technical progress and product technology transformation, to meet the national economy especially the development of manufacturing industry.

China's laser industry is developing rapidly, laser welding has made a breakthrough, and the equipment price will be further reduced, which will reduce the cost of laser welding in the production of lithium ion battery, initially more lithium ion battery manufacturers will choose laser welding. Laser welding in lithium ion battery industry will be more and more widely used, and form a new development trend.
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