Top cap welding apparatus for cylindrical battery cells and top cap welding method for cylindrical battery cells using the same

By designing a top cover welding device that includes conveying, pressing, supporting, top cover holding and welding units, and by injecting inert gas into the internal space of the welding mask unit, the problem of inaccurate gas injection in the welding of cylindrical battery cells is solved, the welding quality is improved and welding defects are prevented.

CN123036178APending Publication Date: 2026-11-03LG ENERGY SOLUTION LTD
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Patent Information

Application Number
CN202580013057.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-02-25
Filing Date
2025-12-02
Publication Date
2026-11-03

AI Technical Summary

Technical Problem

In the prior art, when welding the top cover of a cylindrical battery cell to the electrode contacts, it is difficult to accurately inject inert gas, which leads to a decrease in welding quality and welding defects.

Method used

A top cover welding device is used, which includes a conveying unit, a pressing unit, a supporting unit, a top cover retainer, a top cover support unit, and a welding unit. The welding unit has a welding mask unit, through which inert gas is injected to ensure that the gas is accurately injected into the welding joint.

Benefits of technology

Effectively prevents welding defects and ensures welding quality. Through the design of the welding mask unit, inert gas can be precisely injected to remove impurities at the weld joint and improve the welding effect.

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Abstract

Disclosed are a top cover welding apparatus for a cylindrical battery cell and a top cover welding method for a cylindrical battery cell using the same, the apparatus including a transfer unit configured to transfer a cylindrical battery case in which an electrode assembly having an outwardly exposed electrode tab is received, a pressing unit located in front of the battery case and configured to press the battery case, a support unit located at a rear portion of the battery case and configured to support the battery case, a top cover holder configured to position a top cover at a rear portion of the electrode tab, a top cover support unit configured to support a rear portion of the top cover, and a welding unit configured to weld the electrode tab and the top cover to each other, wherein the welding unit includes a welding mask unit configured to bring the electrode tab into close contact with the top cover, has an inner space, and includes a debris removal unit including a shielding gas injection unit configured to inject an inert gas into the inner space.
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Citation Information

Patent Citations

  • Positive electrode active material, methode for manufacturing the same, positive electrode and lithium secondary battery comprising the same

    KR1020250024416A