How to reduce the welding deformation of lithium battery laser welding machine?

In the production process of lithium batteries, welding deformation is a headache. Welding deformation will not only affect the appearance of the battery, but also cause damage to the internal structure of the battery, which will affect the performance and safety of the battery. As a laser welding machine manufacturer in the field of laser automation equipment for 20 years, Hewei Laser today will give you a good talk about how to reduce the welding deformation of lithium battery laser welding machine.

Choosing quality equipment is key

A lithium battery laser welding machine with excellent performance has inherent advantages in reducing welding deformation. The lithium battery laser welding machine produced by Haiwei Laser uses an advanced laser control system and a high-precision mechanical structure. The laser energy output is stable, and the heat input in the welding process can be accurately controlled, reducing the risk of welding deformation caused by uneven heat from the root. In the selection of equipment, we must pay attention to the stability of the equipment, energy control accuracy and other key indicators, which is essential to reduce welding deformation.

Optimize welding process parameters

Welding process parameters have significant influence on welding deformation. The first is the laser power, too high power will make the weld heat is too much, easy to cause deformation. The laser power should be set according to the battery material and welding requirements. For example, welding thinner lithium battery shells, appropriate reduction of power, both to ensure welding strength, but also to reduce the thermal impact.

The second is the welding speed, the speed is too slow will let the heat accumulate in the local, accelerate the deformation; If the speed is too fast, the welding may not be strong. It is necessary to find the appropriate welding speed through the test, so that the heat is evenly distributed. In addition, the pulse width can not be ignored, the appropriate pulse width can control the heat release of each welding, to avoid the deformation caused by excessive heat instantaneously.

Use appropriate welding methods

Different welding methods have great differences on the degree of welding deformation. For lithium battery welding, wire filling welding method can be used. Adding appropriate amount of welding wire in the welding process, welding wire melting after filling the weld, can effectively relieve welding stress, reduce deformation. Dual beam or multi-beam welding technology can also be used, with multiple lasers acting on the weld from different angles, so that the heat distribution is more uniform and the possibility of deformation is reduced.

Prepare for welding

Pretreatment of the battery material before welding can also reduce deformation. For example, cleaning the welding parts and removing the oil and impurities on the surface can make the laser energy better absorbed by the material and reduce the local overheating caused by energy loss. At the same time, reasonable design of the battery structure, increase the structure of reinforcement bars, improve the overall rigidity of the battery, and also help to resist welding deformation.

Welding deformation is a "roadblock" in the production of lithium batteries, and the key to solving it is to choose the right equipment and master the scientific method. Laser welding machine manufacturer Haiwei Laser 20 years focus on research and development, to create lithium battery laser welding machine, excellent performance. Long-term use of such high-quality laser equipment, enterprises in the lithium battery welding link, not only can efficiently overcome deformation problems, but also achieve high-quality production, for enterprises in the fierce market competition to win the opportunity.