Seal welding method and device for battery shell cover

Abstract

The invention provides a sealing welding method and device for a battery shell cover. The method comprises the following steps: obtaining geometric parameters of a lithium ion battery and welding parameters of a laser welding device; controlling a cover closing device to sequentially perform cover closing operation and rotating operation on the lithium ion battery according to the geometric parameters; and according to the welding parameters, controlling a laser head of the laser welding device to extend to a welding seam between the shell and the shell cover of the lithium ion battery, and controlling the laser head to output single-wavelength swing laser so as to carry out laser welding on the welding seam. When the battery is covered, sealed and welded, the form of a metallographic molten pool of the welding seam can be well controlled, on the basis of ensuring the effective fusion depth and fusion width required by the process, the control on a heat affected zone of the welding seam, the control on external welding spatter and the control on internal air holes of a welding part achieve remarkable effects, so that the overall temperature rise in the welding process is reduced, and therefore, the sealing welding quality of the lithium ion battery is ensured.

Description

technical field

[0001] The invention relates to the technical field of battery processing, in particular to a method and device for sealing and welding battery case covers. Background technique

[0002] In recent years, with the country's policy support for new energy, the lithium-ion battery industry has developed rapidly. In the production process of lithium-ion batteries, the current collecting plate must be welded to both ends of the battery cell first, then the shell cover and the shell are combined together, and finally the shell and the shell cover are sealed and welded.

[0003] At present, the sealing welding method for the battery case cover is to perform sealing laser welding on the welding seam between the case cover and the casing while driving the lithium-ion battery to rotate after clamping and positioning the lithium-ion battery. However, the existing laser welding method is usually a fixed-focus welding mode, the welding power density is high, the maximum p...

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