Tab laser welding equipment

Abstract

The invention provides tab laser welding equipment and relates to the technical field of lithium battery manufacturing. The tab laser welding equipment comprises a machine body, an automatic unwindingdevice, an automatic winding device, a drive device and a tab laser welding device; the automatic unwinding device is arranged on the machine body and is used for bearing and unwinding a pole piece coil; the automatic winding device is arranged on the machine body and is used for bearing and winding the pole piece coil; the drive device is arranged between the automatic unwinding device and the automatic winding device and is used for driving the pole piece to move to the automatic winding device from the automatic unwinding device; and the tab laser welding device is arranged on the machinebody and is used for performing laser welding on a pole piece. Compared with the prior art, for the tab laser welding equipment provided by the invention, through a laser welding mode, by adopting non-contact welding, a welding head does not need to be replaced like ultrasonic welding, indexes, such as the virtual welding rate, the residual rate after welding and the tension, can be effectively ensured, and the welding problem caused by ultrasonic welding is solved.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a laser welding tab device. Background technique [0002] In the welding process of the lithium-ion battery tab and the pole piece base material, the pole piece base material is a very thin sheet (within 12 μm). In the welding process of the lithium-ion battery tab and the pole piece base material, the traditional welding method uses Ultrasonic welding, the high-voltage and high-frequency signals generated by the generator are converted into high-frequency mechanical vibrations and processed on the tab and the foil of the pole piece, and the temperature of the contact point is made by the friction between the pole piece base material, the tab and the welding head When the temperature reaches the melting point of the tab and the foil, the tab and the foil will melt, and the two will melt. However, there are several very difficult problems in the welding of t...

AI Technical Summary

Problems solved by technology

However, there are several very difficult problems in the welding of tabs and pole sheet foils: the life of the welding head is limited and it needs to be replaced regularly; The burrs are too large, the pulling force between the pole piece foil and the tab is not enough, the discharge current is not enough during the formation discharge process, the resistance is too large, etc.

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