Secondary battery and method for manufacturing same

The adhesive layer positioned under the electrode lead's front edge prevents electrode tab bundle tearing in lithium secondary batteries, maintaining performance and electrical connection by covering burrs, addressing the manufacturing issue in pouch-type lithium secondary batteries.

WO2025206592A1PCT designated stage Publication Date: 2025-10-02LG ENERGY SOLUTION LTD
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Patent Information

Application Number
PCT/KR2025/002511
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-29
Filing Date
2025-02-21
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Pouch-type lithium secondary batteries face performance degradation due to the risk of electrode tab bundle tearing during manufacturing, often caused by burrs on the electrode lead that come into contact with the electrode tab bundle.

Method used

An adhesive layer is positioned between the electrode tab bundle and the electrode lead, specifically under the front edge of the electrode lead, to prevent tearing and ensure precise welding, using a non-conductive adhesive that does not overlap with the electrode lead in the thickness direction.

Benefits of technology

Prevents electrode tab bundle tearing and maintains electrical connection integrity by positioning the adhesive layer to cover the burr, ensuring consistent battery performance and precise welding.

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    Figure KR2025002511_02102025_PF_FP_ABST
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Abstract

The secondary battery according to some embodiments may comprise: an electrode assembly including an electrode tab bundle on one side thereof; an electrode lead welded to the electrode tab bundle; and an adhesive layer positioned between the electrode tab bundle and the electrode lead and positioned under a front edge of the electrode lead. The secondary battery according to some embodiments can prevent performance degradation by ensuring that the electrode tab bundle does not tear.
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Citation Information

Patent Citations

  • Secondary battery and manufacturing method thereof

    KR1020250145751A

  • Battery Cell

    KR101734703B1

  • Secondary battery and method of combining electrode tab with electrode lead in secondary battery

    KR1020140032739A

  • Secondary Battery with Advanced Safety

    KR1020160014916A

  • Battery apparatus and system for management of battery temperature

    KR102225889B1