Battery cell, and battery pack and vehicle including battery cell

The battery cell design addresses separator damage and manufacturing complexity by using a direct external welding and venting mechanism, enhancing energy density and productivity while reducing costs.

WO2026127626A1PCT designated stage Publication Date: 2026-06-18LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2025-12-10
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Conventional cylindrical battery cells face issues with damaged separators during ultrasonic welding, limited energy density due to large center holes and rivet terminals, and complex manufacturing processes, leading to reduced productivity and increased costs.

⚗Method used

A battery cell design featuring a lead assembly with a terminal directly welded to the electrode assembly outside the housing, using an insulating gasket and venting mechanism, and a simplified manufacturing process that eliminates riveting and reduces the center hole diameter.

🎯Benefits of technology

Improves energy density, productivity, and reduces costs by minimizing separator damage, simplifying assembly, and maximizing welding area, while ensuring stable electrical insulation and efficient gas discharge.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to a battery cell comprising: an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound around a winding axis; a housing which accommodates the electrode assembly through an opening formed at one side thereof, has a closed portion formed at the other side thereof, and is configured to be electrically connected to the second electrode; and a lead assembly configured to cover the opening of the housing, the lead assembly comprising a lead having a first hole, a terminal at least partially inserted into the first hole and configured to be coupled to the first electrode, and an insulating gasket provided between the lead and the terminal.
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