Solid electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-11791105-B2
Application number	US-202217719487-A
Country	US
Kind code	B2
Filing date	Apr 13, 2022
Priority date	Apr 14, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A solid electrolytic capacitor includes a capacitor element, an outer anode terminal, an outer cathode terminal and an outer mold. The capacitor element has an anode lead wire, an anode body and a cathode layer. The capacitor element has an upper surface and a lower surface in an up-down direction. The outer cathode terminal and the outer anode terminal are positioned away from each other in a predetermined direction perpendicular to the up-down direction. The outer cathode terminal has an upper portion, a lower portion and a connecting portion. One of the upper portion and the lower portion is longer than a remaining one of the upper portion and the lower portion in the predetermined direction. The outer mold covers the capacitor element so that each of the outer anode terminal and the outer cathode terminal is partially exposed to an outside of the solid electrolytic capacitor.

First claim

What is claimed is:

1. A solid electrolytic capacitor comprising a capacitor element, an outer anode terminal, an outer cathode terminal and an outer mold, wherein:
the capacitor element has an anode lead wire, an anode body and a cathode layer;
the capacitor element has an upper surface and a lower surface in an up-down direction;
the outer anode terminal is connected with the anode lead wire;
the outer cathode terminal is connected with the cathode layer;
the outer cathode terminal and the outer anode terminal are positioned away from each other in a predetermined direction perpendicular to the up-down direction;
the outer cathode terminal has an upper portion, a lower portion and a connecting portion;
the upper portion is positioned above the upper surface of the capacitor element in the up-down direction;
the lower portion is positioned below the lower surface of the capacitor element in the up-down direction;
the connecting portion connects the upper portion and the lower portion with each other;
one of the upper portion and the lower portion is longer than a remaining one of the upper portion and the lower portion in the predetermined direction;
the outer mold covers the capacitor element so that each of the outer anode terminal and the outer cathode terminal is partially exposed to an outside of the solid electrolytic capacitor;
the upper portion has an upper surface and a lower surface in the up-down direction;
the lower surface of the upper portion is larger than the upper surface of the upper portion;
the lower portion has an upper surface and a lower surface in the up-down direction; and
the upper surface of the lower portion is larger than the lower surface of the lower portion.

2. The solid electrolytic capacitor as recited in claim 1 , wherein:
the upper portion has an edge in the predetermined direction;
the edge of the upper portion is, at least in part, oblique to the predetermined direction;
the lower portion has an edge in the predetermined direction; and
the edge of the lower portion is, at least in part, oblique to the predetermined direction.

3. The solid electrolytic capacitor as recited in claim 1 , wherein the connecting portion has a size smaller than a size of any of the upper portion and the lower portion in a width direction perpendicular to both the up-down direction and the predetermined direction.

4. The solid electrolytic capacitor as recited in claim 1 , wherein:
the connecting portion has a first connecting element, a connecting main portion and a second connecting element;
the first connecting element connects the upper portion and the connecting main portion with each other;
the connecting main portion connects the first connecting element and the second connecting element with each other;
the second connecting element connects the connecting main portion and the lower portion with each other;
the first connecting element has a size smaller than a size of any of the upper portion and the lower portion in a width direction perpendicular to both the up-down direction and the predetermined direction; and
the second connecting element has a size smaller than the size of any of the upper portion and the lower portion in the width direction.

5. The solid electrolytic capacitor as recited in claim 1 , wherein the lower portion and the cathode layer are connected with each other by conductive adhesive.

6. The solid electrolytic capacitor as recited in claim 5 , wherein the upper surface of the lower portion is formed with irregularities.

7. The solid electrolytic capacitor as recited in claim 1 , wherein the anode lead wire is welded to the outer anode terminal by laser welding.

8. The solid electrolytic capacitor as recited in claim 1 , wherein:
the outer mold has an outer surface; and
the anode lead wire is positioned away from the outer surface of the outer mold.

9. The solid electrolytic capacitor as recited in claim 1 , wherein the outer anode terminal has an L-shaped cross-section in a plane which is defined by the up-down direction and the predetermined direction.

10. The solid electrolytic capacitor as recited in claim 1 , wherein the anode lead wire is a flat wire.

11. A solid electrolytic capacitor comprising a capacitor element, an outer anode terminal, an outer cathode terminal and an outer mold, wherein:
the capacitor element has an anode lead wire, an anode body and a cathode layer;
the capacitor element has an upper surface and a lower surface in an up-down direction;
the outer anode terminal is connected with the anode lead wire;
the outer cathode terminal is connected with the cathode layer;
the outer cathode terminal and the outer anode terminal are positioned away from each other in a predetermined direction perpendicular to the up-down direction;
the outer cathode terminal has an upper portion, a lower portion and a connecting portion;
the upper portion is positioned above the upper surface of the capacitor element in the up-down direction;
the lower portion is positioned below the lower surface of the capacitor element in the up-down direction;
the connecting portion connects the upper portion and the lower portion with each other;
one of the upper portion and the lower portion is longer than a remaining one of the upper portion and the lower portion in the predetermined direction;
the outer mold covers the capacitor element so that each of the outer anode terminal and the outer cathode terminal is partially exposed to an outside of the solid electrolytic capacitor;
the connecting portion has a first connecting element, a connecting main portion and a second connecting element;
the first connecting element connects the upper portion and the connecting main portion with each other;
the connecting main portion connects the first connecting element and the second connecting element with each other;
the second connecting element connects the connecting main portion and the lower portion with each other;
the first connecting element has a size smaller than a size of any of the upper portion and the lower portion in a width direction perpendicular to both the up-down direction and the predetermined direction; and
the second connecting element has a size smaller than the size of any of the upper portion and the lower portion in the width direction.

12. The solid electrolytic capacitor as recited in claim 11 , wherein the lower portion and the cathode layer are connected with each other by conductive adhesive.

13. The solid electrolytic capacitor as recited in claim 12 , wherein:
the lower portion has an upper surface and a lower surface in the up-down direction; and
the upper surface of the lower portion is formed with irregularities.

14. The solid electrolytic capacitor as recited in claim 11 , wherein the anode lead wire is welded to the outer anode terminal by laser welding.

15. The solid electrolytic capacitor as recited in claim 11 , wherein:
the outer mold has an outer surface; and
the anode lead wire is positioned away from the outer surface of the outer mold.

16. The solid electrolytic capacitor as recited in claim 11 , wherein the outer anode terminal has an L-shaped cross-section in a plane which is defined by the up-down direction and the predetermined direction.

17. The solid electrolytic capacitor as recited in claim 11 , wherein the anode lead wire is a flat wire.

Assignees

• Tokin Corp

Inventors

• Takata Hitoshi
• Ishijima Masami
• Abe Satoshi
• Saito Kazuaki

Classifications

• H01G9/012 Primary

  specially adapted for solid capacitors · CPC title

• H01G9/10

  Sealing, e.g. of lead-in wires · CPC title

• H01G9/15

  Solid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G9/048

  characterised by their structure (H01G11/22 takes precedence) · CPC title

• H01G9/0003

  Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films (H01G9/12 takes precedence) · CPC title