Electrode assembly, method and apparatus for manufacturing the same, cylindrical battery including electrode assembly, battery pack including the same, and automobile

The tab-less cylindrical battery design with welded current collector plates and uniform folding of plain portions addresses high resistance and heat generation issues, enhancing energy density and safety during rapid charging.

JP2026086402APending Publication Date: 2026-05-26LG ENERGY SOLUTION LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
LG ENERGY SOLUTION LTD
Filing Date
2026-01-05
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Conventional cylindrical batteries face issues with high resistance and heat generation due to concentrated current flow at electrode tabs, which can lead to safety risks during rapid charging, especially when scaled for electric vehicles.

Method used

A tab-less cylindrical battery design with blank positive and negative electrode sections at the ends, where current collector plates are welded to these sections, and a method and apparatus for manufacturing an electrode assembly that ensures uniform folding of plain portions to improve current collection efficiency and reduce resistance.

Benefits of technology

The solution reduces resistance, enhances energy density, improves electrolyte impregnation, and increases safety during rapid charging by ensuring uniform folding of plain portions and using ultrasonic cutting to form a flat bent surface region, thereby improving manufacturing productivity and reducing costs.

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Abstract

The present invention provides a method and apparatus for manufacturing an electrode assembly that can ensure a uniform folded shape of the plain portion when folding the plain portion of a tablet cylindrical battery, and an electrode assembly manufactured by the method and apparatus. [Solution] The electrode assembly is an electrode assembly in which two electrodes and a separation membrane interposed between them are wound around a single axis, and at least one long side end of the electrodes includes a plain portion exposed to the outside of the separation membrane along the axial direction, and one end of the electrode assembly is provided with a winding turn portion of the plain portion, the winding turn portion includes cut portions and bent portions arranged alternately along the circumferential direction, the axial height of the cut portions is lower than the axial height of the bent portions, the bent portions include a plurality of plain portion flags arranged along the radial direction of the electrode assembly, and the plurality of plain portion flags are bent along the radial direction of the electrode assembly while overlapping along the axial direction.
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