Electrolytic capacitors

The electrolytic capacitor's recessed sealing material and external pressure deformation suppression plate accommodate expansion and contraction, preventing deformation and maintaining sealing efficacy, addressing the limitations of integrated layers in existing capacitors.

JP2026113636APending Publication Date: 2026-07-07SAN DENSHI INDS
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Patent Information

Application Number
JP2026062016
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-12-06
Filing Date
2026-04-03
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing electrolytic capacitors face a reduction in sealing effect due to the integration of inorganic layers, resin layers, or ceramic reinforcing members with the same outer diameter as the sealing material, which restricts expansion and contraction, leading to deformation and potential damage to the capacitor element.

Method used

The electrolytic capacitor features a recessed sealing material with an outer diameter smaller than the main case, an external pressure deformation suppression plate within this recess, and a tapered portion on the main case to accommodate expansion and contraction, along with a bent portion to guide resin flow, preventing deformation and maintaining sealing efficacy.

Benefits of technology

The design suppresses deformation of the sealing material during environmental changes and resin molding, preserving the capacitor element's integrity and enhancing sealing effectiveness.

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Abstract

This design suppresses the reduction in the sealing effect of the main case when the main case expands and contracts due to the environment in which the electrolytic capacitor is placed, and also prevents the sealing material from being compressed and deformed during resin molding. [Solution] In the electrolytic capacitor 1, the sealing material 6 has a recess 8 on the opening side 3 of the main case 4, which has an outer diameter smaller than the outer diameter of the sealing material and is recessed toward the capacitor element side, and an outer peripheral holding portion 9 provided on the outer circumference of the recess, and a plate-shaped external pressure deformation suppressing plate 10 is provided inside the recess, and at least a part of the outer peripheral portion of the external pressure deformation suppressing plate provided inside the recess is covered by the inner peripheral portion of the outer peripheral holding portion of the sealing material.
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Citation Information

Patent Citations

  • Chip type aluminum electrolytic capacitor

    JP1996293435A

  • Sealing body for sealed electrochemical device and sealed electrochemical device using sealing body

    JP2015173241A

  • Electrolytic capacitor and method for manufacturing the same

    JP2019140257A