Solid electrolytic capacitor

• US 10,629,383 B2
• Filed: 03/29/2017
• Issued: 04/21/2020
• Est. Priority Date: 03/31/2016
• Status: Active Grant

• Current Assignee: Japan Capacitor Industrial Co., Ltd.
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Nobuta, Tomoki, Fujimoto, Kazumasa, Yokokura, Osamu
• Primary Examiner(s): Ferguson, Dion
• Application Number:
  US15/472,826
• Publication Number:
  US 20170287647A1
• Time in Patent Office: 1,119 Days
• CPC Class Codes: H01G 9/012 specially adapted for solid capacitors
• CPC Class Codes: H01G 9/042 characterised by the material H01G11/22 takes precedence
• CPC Class Codes: H01G 9/0425 specially adapted for cathode
• CPC Class Codes: H01G 9/048 characterised by their structure H01G11/22 takes precedence
• CPC Class Codes: H01G 9/055 Etched foil electrodes
• CPC Class Codes: H01G 9/07 Dielectric layers
• CPC Class Codes: H01G 9/10 Sealing, e.g. of lead-in wires
• CPC Class Codes: H01G 9/14 Structural combinations or circuits for modifying, or compensating for, electric characteristics of electrolytic capacitors
• CPC Class Codes: H01G 9/15 Solid electrolytic capacitors H01G11/00 takes precedence
• CPC Class Codes: H01G 9/26 Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices with each other

Abstract

A solid electrolytic capacitor that includes a capacitor element having a linear through conductor made of a valve function metal, a dielectric layer disposed on the through conductor, and a cathode-side functional layer disposed on the dielectric layer. The through conductor includes a core portion and a porous portion covering a peripheral surface of the core portion. Both end faces of the core portion of the through conductor are in contact with a pair of anode terminals on the pair of end faces of the body, respectively. A cathode terminal is electrically connected to the cathode-side functional layer.

Claims

1. A solid electrolytic capacitor comprising:

a capacitor element including;

a linear through conductor made of a valve function metal and having a cylindrical shape, the through conductor including a core portion extending in an axial direction of the through conductor and having a pair of end faces facing each other, and a porous portion covering a peripheral surface of the core portion,

a dielectric layer disposed along a surface of the porous portion, and

a cathode-side functional layer disposed on the dielectric layer,

a pair of flat-shaped anode terminals respectively disposed on and covering the pair of end faces of the core portion;

a cathode terminal electrically connected to the cathode-side functional layer; and

an electric insulating member disposed between the cathode-side functional layer and each of the pair of anode terminals, the electric insulating member extending to and terminating at each of the pair of end faces of the core portion, and the electric insulating member being in direct contact with the pair of flat-shaped anode terminals.

2. The solid electrolytic capacitor according to claim 1, wherein the cathode-side functional layer includes a conductive polymer layer filling at least part of pores of the porous portion.

3. The solid electrolytic capacitor according to claim 1, wherein the electric insulating member is in contact with the core portion.

4. The solid electrolytic capacitor according to claim 3, wherein the electric insulating member fills pores of the porous portion at a part thereof where the electric insulating member is in contact with the core portion.

5. The solid electrolytic capacitor according to claim 3, wherein the porous portion does not contact the pair of anode terminals.

6. The solid electrolytic capacitor according to claim 1, wherein the anode terminal includes a plated film.

7. The solid electrolytic capacitor according to claim 1, wherein the anode terminal includes a conductive resin film.

8. The solid electrolytic capacitor according to claim 1, wherein the porous portion is an etched portion on the peripheral surface of the linear through conductor.

9. The solid electrolytic capacitor according to claim 1, wherein the body includes a plurality of the capacitor elements connected in parallel with each other through the pair of anode terminals and the cathode terminal.

10. The solid electrolytic capacitor according to claim 1, wherein the cathode terminal is a metal plate.

11. The solid electrolytic capacitor according to claim 1, further comprising a sealing member containing resin which covers the capacitor element.

12. The solid electrolytic capacitor according to claim 1, wherein the sealing member further contains a magnetic material.

13. The solid electrolytic capacitor according to claim 1, wherein the cathode terminal is exposed from the sealing member.

14. The solid electrolytic capacitor according to claim 1, wherein the valve function metal is selected from aluminum, tantalum, niobium, titanium, or an alloy thereof.

15. A solid electrolytic capacitor comprising:

a body including a pair of end faces facing to each other and a bottom surface adjacent to the end faces;

a pair of flat shaped anode terminals disposed on the pair of end faces of the body; and

a cathode terminal disposed on the bottom surface of the body,

the body including;

a sealing member containing resin, and

a capacitor element covered by the sealing member,

the capacitor element including;

a linear through conductor having a cylindrical shape and made of a valve function metal,

a dielectric layer disposed on the through conductor, and

a cathode-side functional layer disposed on the dielectric layer and electrically connected with the cathode terminal,

the through conductor including a core portion extending in an axial direction of the through conductor, and a porous portion covering a peripheral surface of the core portion and including a large number of fine pores,

the dielectric layer being formed along an inner peripheral surface of each of the fine pores of the porous portion, and

both end faces of the core portion of the through conductor being exposed from the sealing member and in contact with and covered by the pair of anode terminals on the pair of end faces of the body, respectively; and

an electric insulating member disposed between the cathode-side functional layer and each of the pair of anode terminals, the electric insulating member extending to and terminating at each of the pair of end faces of the core portion, and the electric insulating member being in direct contact with the pair of flat-shaped anode terminals.