Solid electrolytic capacitor

Patent metadata

Field	Value
Publication number	US-10991515-B2
Application number	US-201916384028-A
Country	US
Kind code	B2
Filing date	Apr 15, 2019
Priority date	Oct 17, 2016
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A solid electrolytic capacitor that includes a plurality of laminated units each including a valve action metal substrate including a porous layer on a surface thereof, a dielectric layer on a surface of the porous layer, and a solid electrolyte layer on the dielectric layer. A metal foil is between the laminated units. The units and the conductor layers are sealed with a coating resin. The valve action metal substrate has an anode section-side end surface directly connected to an anode outer electrode on the surface of the coating resin, and the metal foil is directly connected to a cathode outer electrode on the surface of the coating resin.

First claim

The invention claimed is:

1. A solid electrolytic capacitor comprising:
a plurality of laminated units, each unit of the plurality of laminated units including:
a valve action metal substrate including a porous layer on a surface thereof, the valve action metal substrate having an anode section-side end surface;
a dielectric layer on a surface of the porous layer;
a solid electrolyte layer on the dielectric layer; and
a carbon layer on the solid electrolyte layer;

a metal foil between the laminated units, wherein the metal foil has a surface coated with carbon and the carbon-coated surface of the metal foil is in direct contact with the carbon layer;
a coating resin sealing the plurality of laminated units and the metal foil;
an anode outer electrode on a surface of the coating resin and directly connected to the anode section-side end surface of the valve action metal substrate; and
a cathode outer electrode on the surface of the coating resin and directly connected to the metal foil.

2. The solid electrolytic capacitor according to claim 1 , wherein a contact resistance between the metal foil and the carbon layer is less than a contact resistance between the carbon layer and the solid electrolyte layer.

3. The solid electrolytic capacitor according to claim 2 , wherein the contact resistance between the metal foil and the carbon layer is 5 mΩ to 351 mΩ.

4. The solid electrolytic capacitor according to claim 1 , wherein the metal foil has a roughened surface.

5. The solid electrolytic capacitor according to claim 1 , further comprising a coat layer made of an anchor coat agent on a surface of the metal foil.

6. The solid electrolytic capacitor according to claim 4 , wherein a surface roughness Ra of the metal foil is 30 nm to 1,002 nm.

7. The solid electrolytic capacitor according to claim 5 , wherein a surface roughness Ra of the metal foil is 30 nm to 1,002 nm.

8. The solid electrolytic capacitor according to claim 1 , wherein the metal foil has a thickness of 6 μm to 100 μm.

9. The solid electrolytic capacitor according to claim 1 , wherein the metal foil has a through-thickness resistance of 5 mΩ to 34 mΩ.

10. The solid electrolytic capacitor according to claim 1 , wherein the metal foil is made of at least one metal selected from aluminum, copper, and silver.

11. The solid electrolytic capacitor according to claim 1 , wherein the metal foil includes at least one through-hole.

12. The solid electrolytic capacitor according to claim 1 , further comprising an insulating layer surrounding the valve action metal substrate so as to isolate an anode section and a cathode section of the valve action metal substrate.

Assignees

• Murata Manufacturing Co

Inventors

• Harada Hiroyuki
• Tsutsumi Toshio
• Matsuo Masahiro
• Fujimoto Kazumasa
• Shirakawa Sachiko

Classifications

• H01G9/15 Primary

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

• H01G9/055 Primary

  Etched foil electrodes · CPC title

• H01G9/0032

  formation of the dielectric layer · CPC title

• H01G9/07

  Dielectric layers · CPC title

• H01G9/0036

  Formation of the solid electrolyte layer · CPC title