# US 12,770,800 B2 · Solid electrolytic capacitor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,770,800 B2
- Document ID: US12770800B2
- Status: Granted
- Kind: B2
- Application number: 18/962,950
- Filed: 2024-11-27
- Published: 2025-03-13
- Granted: 2026-10-20
- Earliest claimed: 2022-05-31
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Naoya Kawamura; Hitoshi Fukui
- Web page: https://patentgrep.com/patent/US12770800B2

## CPC

- H01G 9/012: specially adapted for solid capacitors
- H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ
- H01G 9/10: Sealing, e.g. of lead-in wires
- H01G 9/15: Solid 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

A disclosed solid electrolytic capacitor includes a capacitor element, a lead terminal and a lead terminal that are electrically connected to the capacitor element, and an exterior body that seals a portion of the lead terminal, a portion of the lead terminal, and the capacitor element. The exterior body includes a resin part containing a resin. The resin has a glass transition point Tg of 140° C. or less, where the glass transition point Tg is a temperature of the resin part at which a loss modulus measured by nanoscale dynamic viscoelastic measurement using a nanoindentation method changes from an increasing state to a decreasing state. The hardness of the resin part measured by the nanoindentation method is 0.08 GPa or less in a temperature range from the glass transition point Tg to 260° C. inclusive.

## Claims

### Claim 1

A solid electrolytic capacitor comprising a capacitor element, a lead terminal that is electrically connected to the capacitor element, and an exterior body that seals the capacitor element and a portion of the lead terminal,
wherein the exterior body includes a resin part containing a resin,
the resin has a glass transition point Tg of 140° C. or less, where the glass transition point Tg is a temperature at which a loss modulus of the resin part measured by nanoscale dynamic viscoelastic measurement using a nanoindentation method changes from an increasing state to a decreasing state, and
in a temperature range from the glass transition point Tg to 260° C. inclusive, a hardness of the resin part measured by the nanoindentation method is 0.08 GPa or less.

### Claim 2 (depends on 1)

The solid electrolytic capacitor according to claim 1,
wherein the glass transition point Tg of the resin is 125° C. or less.

### Claim 3 (depends on 1)

The solid electrolytic capacitor according to claim 1,
wherein the resin is an epoxy resin.

### Claim 4 (depends on 1)

The solid electrolytic capacitor according to claim 1,
wherein the exterior body further includes a filler dispersed in the resin part.

### Claim 5 (depends on 4)

The solid electrolytic capacitor according to claim 4,
wherein a content of the filler in the exterior body is in a range of 75% by mass to 90% by mass.

### Claim 6 (depends on 4)

The solid electrolytic capacitor according to claim 4,
wherein a maximum particle diameter of the filler is 55 μm or less.

### Claim 7 (depends on 1)

The solid electrolytic capacitor according to claim 1,
wherein an average value of an electrostatic capacitance change rate represented by the following formula is −5.0% or more:
electrostatic
⁢
capacitance
⁢
change
⁢
rate
⁢
(
%
)
=
100
×
(
C
⁢
1
-
C
⁢
0
)
/
C
⁢
0
,
where C0 is an initial electrostatic capacitance and C1 is an electrostatic capacitance after heating at 125° C. for 7000 hours.