Laser welding in lithium battery

As the core component of new energy vehicle, the quality of lithium ion battery directly determines the performance of the vehicle.Lithium ion battery manufacturing equipment generally consists of three types: front-end equipment, mid-end equipment, and back-end equipment. The precision and automation level of the equipment will directly affect the production efficiency and consistency of the products. As an alternative to traditional welding technology, laser processing technology has been widely used in lithium battery manufacturing equipment.

Application of Laser welding in the production of lithium battery

Welding is a very important manufacturing process from the manufacturing of lithium ion battery cell to the battery PACK. The conductivity, strength, air tightness, metal fatigue and corrosion resistance of lithium ion battery are typical evaluation standards for battery welding quality.The choice of welding method and welding process will directly affect the cost, quality, safety and consistency of the battery.

Laser welding has high energy density, small welding deformation and small heat-affected zone, which can effectively improve the precision of the workpiece. The welding seam is smooth and free of impurities, uniform and compact, and no additional polishing is required.Laser welding can be accurately controlled, with small focal point, high precision positioning, easy to realize automation with mechanical arm, improve welding efficiency, reduce working hours, reduce cost;In addition, laser welding of thin plate or thin diameter wire rod will not be subject to the trouble of remelting as easily as arc welding, and it can be welded with a wide variety of materials, which can realize the welding between different materials.

The characteristics of laser processing lithium ion battery

(1) welding refractory materials such as titanium, quartz, etc., and can be used to weld the opposite material, the effect is good.

(2) After laser focusing, the power density is high. In the welding of high-power devices, the depth-width ratio can reach 5:1, and the height can reach 10:1.

(3) Can be at room temperature or special conditions for welding, welding equipment is simple.For example, a laser beam is not deflected by an electromagnetic field. It can be welded in a vacuum, air, or some gas environment, and can be welded through glass or through a transparent material of the beam.

TOB NEW ENERGY LIMITED is specialized in lithium battery industry, our company can provide you a turnkey project, if you are interested in it, feel free to contact us!
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