Laser welding machine in welding square aluminum shell battery process

Lithium aluminum shell market share is higher than the aluminum shell, it is because of the aluminum shell of high toughness, light net weight, safety-related coefficient of high characteristics to carry out the advantages of the decision.battery pilot line Square battery casing cover's need through welding, welding technology are in order to a very important manufacturing production process, welding work methods and welding construction process selection, will have a direct impact on the study of the cost of the battery, quality, safety issues as well as improve the consistency of the battery. In many welding management methods, laser welding to the following development advantages stand out, the following we introduce the laser welding machine in welding square aluminum shell battery process.

Square battery casing at the top of a rectangular cover plate, the plate contains a positive lead out end, the cover plate will be stuffed into the casing and the upper mouth flush, followed by a laser will cover the square gap in the middle of the casing and the casing, to repeatedly sustained laser method of welding on the sealing, this welding the whole process that is known as the top weld, top weld in the laser to be able to did not move, will be rechargeable batteries fixed immobile in the work of the table, the laser points to the weld, start the The operating table makes the rechargeable battery along the operating table X, Y coordinates successively get rid of the same square pattern with welding.laser welding machine for lithium ion batteries For the square battery cover choose top welding sealing structure processing technology, cover placement without precise positioning ladder, and length standard tolerance provisions are more stringent, welding installation precision provisions are higher.

In order to ensure the welding seam molding effect of high-speed laser welding of the top cover, the following requirements need to be met.

1. Sufficient weld width, appropriate depth-to-width ratio,ESS lithium battery machine large enough range of light source heat, weld energy within a reasonable range.

2. Smooth weld, the weld heat cycle time in the welding process is long enough to make the molten pool has enough fluidity, the weld is solidified into a smooth metal weld under the protection of protective gas;

3. weld for good consistency, porosity, hole less, which needs to be through the welding process, the laser can be stabilized on different workpieces, high-energy beam of plasma continued to produce, the role of the molten pool unit inside the molten pool, the pool in the plasma reaction force under the production of the "keyhole", the keyhole is large enough and sufficiently stable, so that the generation of the metal The keyhole is large enough and stable enough so that the generated metal as well as the vapor and plasma are not easy to eject and bring out a metal droplet to form a large number of splashes, and the molten pool around the keyhole is not easy to collapse and entrap the gas therein.

Power battery shell materials are mainly aluminum alloy and stainless steel, the most used aluminum alloy, generally 1 series and 3 series aluminum alloy. In actual production, it is necessary to select the appropriate laser and welding process parameters according to the material, shape, thickness and tensile force of the battery, including welding speed, waveform, peak value, welding head tilt angle, etc., and set up reasonable welding parameters to ensure that the final welding effect, to meet the requirements of power battery manufacturers.

Laser welding machine in welding square aluminum shell battery process advantages:

1. As most of the laser power injected into the dynamic small hole, reducing the external scattering laser, the required laser power is smaller, the welding heat input is relatively low (30% lower than the composite welding), reducing equipment loss and energy consumption;.

2. Pendulum welding on the workpiece assembly quality adaptability, reducing the assembly steps and other issues caused by defects;

3. Pendulum welding mode of work on the weld hole structure has the ability to repair the structure of the strong repair technology, the use of the program to repair the core weld hole yield is very high;

4. Laser welding can be accurately controlled, focus point is small, high positioning accuracy, with the robotic arm is easy to realize automation, improve welding efficiency, reduce man hours, reduce costs;.

The above is the process of laser welding of square aluminum shell battery. Square aluminum shell lithium batteries in the manufacturing and assembly process, the need for a wide range of laser welding process, such as the core and cover welding soft connection, sealing nail welding, etc.. Laser welding is the main welding method for square power batteries, with high energy density, good power stability, high welding precision, easy system integration and many other advantages, playing an irreplaceable role in the production process of square aluminum shell lithium batteries.