Method for producing cylindrical battery, device for producing cylindrical battery, and cylindrical battery

The method of applying a partial load to a specific electrode body portion before welding addresses the challenge of stable electrode connection in cylindrical batteries, enhancing welding reliability and reducing unnecessary load on electrode ends.

WO2025205032A1 Publication Date: 2025-10-02PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Application Number
PCT/JP2025/009732
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-28
Filing Date
2025-03-13
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Existing cylindrical battery manufacturing methods face challenges in reliably and stably welding the electrode core exposed portion to the current collector plate while avoiding unnecessary load on the electrode ends, which can lead to meandering and uneven contact.

Method used

A manufacturing method and apparatus that applies a partial load to a specific portion of the electrode body before welding, ensuring stable connection by crushing this portion towards the center, thereby reducing the overall load on the electrode ends.

Benefits of technology

This approach allows for reliable and stable welding of the electrode core exposed portion to the current collector plate while minimizing unnecessary load on the electrode ends, reducing electrical resistance and ensuring consistent contact.

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Abstract

This method for producing a cylindrical battery (10) comprises a welding step for welding, to a collector plate (19), an electrode core body exposed part (41) that constitutes a height direction end of an electrode body (14). The method for producing the cylindrical battery (10) comprises a partial load application step for, before the welding step, applying a height direction load to only part of an end face on the height direction end side of the electrode body (14). The partial load application step may be performed a plurality of times in which the region of the end face to which the height direction load is applied is changed. The method for producing a cylindrical battery according to the present disclosure makes it possible to reliably and stably weld, to the collector plate (19), the electrode core body exposed part (41) of the electrode body (14) positioned at said end, and makes it possible to suppress application of an unnecessary load to an electrode (11, 12) at an end on the opposite side from said end of the electrode body (14).
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