Electrode foil supply device and capacitor element manufacturing system

The electrode foil supply device forms controlled cracks in the chemical conversion coating and etching layer to prevent damage to the base aluminum layer, addressing the brittleness issue in thicker capacitor elements, ensuring smooth winding and stress release.

JP7868890B1Active Publication Date: 2026-06-02JCC ENG
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2025-09-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Capacitor elements require thicker etching layers and chemical conversion coatings to accommodate higher capacitance and voltage, leading to increased brittleness and a higher likelihood of cracks that damage the base aluminum layer during winding, especially at small bending radii.

Method used

An electrode foil supply device with a crack formation mechanism that creates controlled cracks in the chemical conversion coating and etching layer without damaging the base aluminum layer, using a curved path with rolling pins and adjustable bending angles to form cracks on the outer surface of the foil.

Benefits of technology

Prevents or suppresses cracks that damage the base aluminum layer during winding, allowing for easier foil handling and winding, while releasing stress and avoiding crack concentration, thus preventing foil disconnection.

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Patent Text Reader

Abstract

To provide an electrode foil supply device that can prevent or suppress the occurrence of cracks that damage the base aluminum layer of the electrode foil when the supply electrode foil is wound by the winding device. [Solution] The electrode foil supply device 20 is equipped with a crack formation mechanism 36 that forms a curved path portion 35 in the middle of the transport path 23. As the electrode foil 5 transported along the curved path portion 35 is bent at a radius corresponding to the outer surface of the rolling pins 37, a crack is formed on one side 5a of the electrode foil 5 that breaks the chemical conversion coating 14 and the etching layers 11 and 12 without damaging the base aluminum layer 13. The one side 5a of the electrode foil 5 is the surface located on the outer circumference when the winding device 80 winds the electrode foil 5.
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Citation Information

Patent Citations

  • Manufacture of electrolytic capacitor

    JP1998303087A

  • Method for forming electrode foil for aluminum electrolytic capacitor

    JP2002367864A

  • Electrolytic capacitor and manufacturing method of the same

    JP2013153024A

  • Capacitor and method for manufacturing the same

    JP2019067939A

  • Electrolytic capacitor

    JP2019067959A