IP Library › Granted Patent US 12688977
Granted Patent B2
US 12688977 · App. 18/891,472 · Granted Jul 21, 2026

Solid electrolytic capacitor

Inventors: Kenji Kuranuki (Kyoto Fu, JP); Saori Ueda (Osaka Fu, JP); Junichi Kurita (Osaka Fu, JP); Masaya Kiso (Hyogo Ken, JP); Daisuke Kubo (Osaka Fu, JP)
Assignee: Panasonic Intellectual Property Management Co., Ltd.
H01G9/15H01G9/0029H01G9/012H01G9/0425H01G9/045H01G9/07H01G9/26
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Quick Facts
Patent No.
US 12688977
App. No.
18/891,472
Granted
Jul 21, 2026
Kind
B2
Abstract

A disclosed solid electrolytic capacitor includes: a stacked unit constituted by a stack of a plurality of capacitor units each having a capacitor element including an anode portion and a cathode portion, and a cathode foil connected to the cathode portion via a first conductive paste; and a cathode lead terminal electrically connected to the cathode portion. The cathode lead terminal has at least one side wall portion facing a side surface of the cathode portion and electrically connected to the cathode foil. This makes it possible to reduce the ESR of the solid electrolytic capacitor.

Claims (19)

1 . A solid electrolytic capacitor comprising:

a stacked unit constituted by a stack of a plurality of capacitor units each having a capacitor element including an anode portion and a cathode portion, and a cathode foil connected to the cathode portion via a first conductive paste; and

a cathode lead terminal electrically connected to the cathode portion, wherein

the cathode lead terminal has at least one side wall portion facing a side surface of the cathode portion and electrically connected to the cathode foil.

2 . The solid electrolytic capacitor according to claim 1 , wherein in each of the capacitor units, a pair of the cathode foils are provided to sandwich the capacitor element.

3 . The solid electrolytic capacitor according to claim 1 , wherein

the side wall portion is connected to the cathode foil via a second conductive paste different from the first conductive paste,

the first conductive paste contains carbon, and

the second conductive paste contains silver.

4 . The solid electrolytic capacitor according to claim 3 , wherein the second conductive paste is in contact with both a main surface and a side surface of the cathode foil.

5 . The solid electrolytic capacitor according to claim 1 , wherein the side wall portion is connected to the cathode foil by laser welding.

6 . The solid electrolytic capacitor according to claim 1 , wherein

the cathode portion has a solid electrolyte layer and a carbon layer provided on a surface of the solid electrolyte layer, and

the carbon layer is in contact with the first conductive paste.

7 . The solid electrolytic capacitor according to claim 6 , wherein the carbon layer has a thickness of 3 μm or less.

8 . The solid electrolytic capacitor according to claim 1 , wherein the first conductive paste has a thickness of 40 μm or less.

9 . The solid electrolytic capacitor according to claim 1 , wherein at least one of the cathode foils is constituted of copper or copper alloy foil.

10 . The solid electrolytic capacitor according to claim 1 , wherein at least one of the cathode foils is constituted of an aluminum foil having a surface layer containing carbon.

11 . The solid electrolytic capacitor according to claim 1 , wherein the capacitor element does not contain silver.