A method for repairing poor welding of battery sealing nails

By using laser welding technology to remove defects in battery sealing pins and weld new sealing pins, combined with CCD identification and first-piece confirmation, the problem of repairing battery cells with poorly welded battery sealing pins is solved, thereby improving the yield rate and safety.

CN116833571BActive Publication Date: 2025-09-12EVE POWER CO LTD
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Patent Information

Application Number
CN202310788077.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-28
Publication Date
2025-09-12
Estimated Expiration
2043-06-28

AI Technical Summary

Technical Problem

The existing battery sealing pins are poorly welded, the re-welding yield of the battery cells is low and there is a risk of electric shock. The traditional processing method is difficult to operate and has poor results.

Method used

Laser welding technology is used to remove defective sealing pins and weld new sealing pins. The welding trajectory is identified by CCD and the laser parameters are adjusted to ensure that the removal depth and weld width are controllable. Combined with first-piece confirmation and vacuum detection, the quality of repair welding is improved.

Benefits of technology

It improves the yield rate of defective battery cell re-soldering, expands the scope of application, reduces the difficulty and risk of operation, and improves the efficiency and safety of re-soldering.

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Abstract

The present invention relates to the technical field of battery sealing nail welding, and in particular to a method for repairing poorly welded battery sealing nails, comprising the following steps: S1, laser removal of defective sealing nails, wherein the removal range at least covers the defective sealing nail welding track, the minimum requirement for sealing nail welding penetration is ≤ removal depth ≤ maximum requirement for sealing nail welding penetration, and the radius of the defective sealing nail is R1; S2, setting a new sealing nail within the removal range and laser welding it, wherein the radius of the new sealing nail is R2, and R2>R1. By utilizing the advantages of small focal diameter, high power density, small heat-affected zone and contactless welding of the welding beam, the defective sealing nail is removed and then the new sealing nail is welded, so that the cleaning depth and range of the removal process are controllable, and the penetration depth and width of the welding process are controllable, thereby improving the welding quality of the newly installed sealing nails and improving the yield rate of repair welding of defective battery cells. At the same time, the laser cleaning and welding range can be adjusted to achieve compatibility with repair welding of sealing nails of different diameters and expand the scope of adaptability.
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