# US 12,112,900 B2 · Electrolytic capacitor

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- Number: US 12,112,900 B2
- Document ID: US12112900B2
- Status: Granted
- Kind: B2
- Application number: 17/811,265
- Filed: 2022-07-07
- Published: 2022-10-27
- Granted: 2024-10-08
- Earliest claimed: 2020-01-30
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Yuichiro Tsubaki; Kazuhiro Takatani; Mitsuhisa Yoshimura; Miyoko Masuda
- Web page: https://patentgrep.com/patent/US12112900B2

## CPC

- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence)
- H01G 9/035: Liquid electrolytes, e.g. impregnating materials (H01G11/54 takes precedence)
- H01G 9/052: Sintered electrodes
- H01G 9/055: Etched foil electrodes
- H01G 9/10: Sealing, e.g. of lead-in wires
- H01G 9/145: Liquid electrolytic capacitors (H01G11/00 takes precedence)
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)

## Abstract

An electrolytic capacitor includes a capacitor element, a liquid component, a case housing the capacitor element and the liquid component, and a sealing member sealing the case. the capacitor element includes a porous sintered body including a dielectric layer, a cathode foil facing at least a part of the porous sintered body, and a conductive polymer covering at least a part of a surface of the dielectric layer. The conductive polymer is in contact with the cathode foil. And a void in the capacitor element is impregnated with the liquid component.

## Claims

### Claim 1

An electrolytic capacitor comprising:
a capacitor element;
a liquid component;
a case housing the capacitor element and the liquid component; and
a sealing member sealing the case, wherein:
the capacitor element includes:
a porous sintered body including a dielectric layer, the porous sintered body having a top surface, a bottom surface and an outer peripheral surface between the top surface and the bottom surface;
a cathode foil facing the outer peripheral surface of the porous sintered body;
a separator disposed between the cathode foil and the porous sintered body, the separator covering the outer peripheral surface of the porous sintered body; and
a conductive polymer disposed in an inside of the porous sintered body and in the separator, the conductive polymer covering at least a part of a surface of the dielectric layer,
the conductive polymer forms, in the separator, a conductive path electrically connecting the cathode foil and the dielectric layer disposed in the inside of the porous sintered body, and
the capacitor element is impregnated with the liquid component.

### Claim 2 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the dielectric layer contains an oxide of at least one metal selected from the group consisting of tantalum, niobium, titanium, aluminum, silicon, and tungsten.

### Claim 3 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the cathode foil is a foil including a valve metal as a main component.

### Claim 4 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the cathode foil further includes a conductive layer including at least one selected from the group consisting of titanium, nickel, and carbon, the conductive layer being disposed on a surface of the cathode foil.

### Claim 5 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the liquid component contains an alkylene glycol compound.

### Claim 6 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the conductive polymer contains a x-conjugated conductive polymer and a first sulfonic acid, and
the liquid component contains a second sulfonic acid.

### Claim 7 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the capacitor element includes an anode terminal electrically connected to the porous sintered body, the anode terminal being constituted by an anode wire planted from the top surface of the porous sintered body, and
the anode terminal penetrates the sealing member to be drawn out of the case.

### Claim 8 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the porous sintered body has a cylindrical shape having the top surface, the bottom surface, and the outer peripheral surface.

### Claim 9 (depends on 1)

The electrolytic capacitor according to claim 1, wherein:
the capacitor element further includes a cathode terminal electrically connected to the cathode foil, and
the cathode terminal penetrates the sealing member and is drawn out of the case.

### Claim 10 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the sealing member includes an insulating member having rubber elasticity.

### Claim 11 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the case is a metal container.

### Claim 12 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the separator covers a part of the top surface and a part of the bottom surface.

### Claim 13 (depends on 1)

The electrolytic capacitor according to claim 1, wherein a part of a space between the cathode foil and the dielectric layer is filled with the conductive polymer.

### Claim 14 (depends on 1)

The electrolytic capacitor according to claim 1, wherein the separator covers an entirety of the outer peripheral surface of the porous sintered body.