The Welding Principle of Prismatic Laser Welding Machine

In the manufacturing and assembly process of lithium prismatic battery, a large number of laser welding processes need to be applied, such as soft connection of electric core and welding of cover plate, sealing welding of cover plate, sealing nail welding, etc. Laser welding is the main welding method of prismatic batteries. Thanks to its high energy density, good power stability, high welding accuracy, easy systematic integration and many other advantages, laser welding plays an irreplaceable role in the production process of square lithium battery.

Principle knowledge of laser welding technology

Laser welding machine is to use high-energy laser pulse to locally heat the material in a small area. The energy radiated by the laser is directed to the internal diffusion of the material through heat transfer, and the material is melted to form a specific molten pool.

It is a new type of welding method, mainly aimed at the welding of thin-walled materials and fine parts, which can realize spot welding, butt welding, overlap welding, seal welding, etc., with high depth to width ratio, small weld width, small heat affected zone, small deformation, fast welding speed, smooth and beautiful weld, no treatment or simple treatment after welding, high weld quality, no porosity, accurate control, small focus spot, high positioning accuracy and easy automation.

Laser welding can be realized by pulse or continuous laser beam;

The principle of laser welding machine can be divided into heat conduction welding and laser deep penetration welding.

Thermal conduction welding:

The surface to be machined is heated by laser radiation, and the surface heat is diffused internally through heat transfer. By controlling laser parameters such as the width, energy, peak power and repetition rate of the laser pulse, the workpiece is melted to form a specific molten pool.

Its characteristics:

The laser power is about 105w/cm2, the weld depth is less than 2.5mm, and the maximum depth width ratio of the weld is 3:1.

Deep penetration welding:

Generally, continuous laser beam is used to connect materials.

That is, the energy conversion mechanism is completed through the "Key hole" structure.

When irradiated by the laser, the material will evaporate and form a small hole, which will absorb all the energy of the incident beam. The temperature will reach about 25000°C, melting the metal around the hole.

The occupancy of aluminum shell prismatic lithium battery is higher than that of steel shell, which is determined by the high hardness, light weight and high safety of aluminum shell. The square lithium battery can be customized according to the product size, so there are many models and specifications in the market, which makes it difficult to unify the process of the square battery. ACEY new energy is able to supply different customizations of prismatic battery welding machine. The standardization of prismatic battery is a trend, which is of great significance for the production and later maintenance of the battery.

Acey new energy has specialized in laser welding machine for over 10 years. Welcome to send us your inquiries.