Electrode assembly and secondary battery comprising same

The electrode assembly addresses uneven welding and structural issues by bending substrate tabs in the direction of larger diameter turns with varying lengths and shapes, enhancing connectivity and preventing damage, thus improving the electrode assembly's performance.

WO2026147146A1PCT designated stage Publication Date: 2026-07-09SAMSUNG SDI CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SAMSUNG SDI CO LTD
Filing Date
2025-12-29
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing secondary battery electrode assemblies face issues with uneven welding characteristics and potential damage due to non-uniform tab overlap and bending in the winding process, particularly near the hollow portion, leading to reduced electrical connectivity and structural integrity.

Method used

The electrode assembly design includes a current collector with a non-circulating portion featuring a substrate tab that is bent in the direction of the larger diameter turn, with varying lengths and shapes of tabs to minimize overlap and improve flatness, ensuring stable welding and reduced damage.

Benefits of technology

This design enhances welding characteristics and prevents damage to the electrode assembly by reducing tab overlap, thereby improving electrical connectivity and structural integrity while maintaining efficient current flow.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure KR2025023055_09072026_PF_FP_ABST
    Figure KR2025023055_09072026_PF_FP_ABST
Patent Text Reader

Abstract

An electrode assembly, according to an embodiment, comprises: a first electrode; a second electrode; and a separator between the first electrode and the second electrode, wherein the first electrode, the second electrode, and the separator are wound in one direction, the first electrode and the second electrode comprise: a current collector including an uncoated portion; and an active material layer on the current collector, the current collector includes a first end at which winding starts and a second end at which winding ends, the uncoated portion comprises a first region in which a substrate tab including a plurality of tabs is disposed and a second region including an open region formed by partially cutting the uncoated portion, and the tabs are bent toward the second end.
Need to check novelty before this filing date? Find Prior Art