Provided is an airtight terminal that is designed to enable implementation of a method for sealing a can case with the airtight terminal with improved readiness and at a reasonable price, as well as an electrical device package and a method for manufacturing an electrical device package. Provided is an airtight terminal that includes a lid composed of a dish-shaped thin metal sheet having a through hole in a surface of the sheet, a lead passing through the through hole in the lid, and an insulating material to hermetically seal a gap between the lead and the lid, wherein the lid has an engagement portion along an edge of the lid to seal a can case by seaming.

An electrolytic capacitor includes a capacitor element and a liquid. The capacitor element includes an anode foil, a cathode foil disposed to face the anode foil, and a conductive polymer layer that is disposed between the anode foil and the cathode foil. A first layer including at least one selected from the group consisting of carbon, nickel, a nickel compound, titanium, and a titanium compound is disposed on the cathode foil. The conductive polymer layer includes a conductive polymer. A proportion of water in the liquid ranges from 0.1% by mass to 6.0% by mass, inclusive.

Provided is a method for producing an electrode for an electrolytic capacitor, the method comprising: a hydration step in which an aluminum electrode is immersed in a hydration treatment solution having a temperature of 80° C. or higher; and a chemical conversion step in which the aluminum electrode is subjected to chemical conversion treatment up to a formation voltage of at least 400 V. The hydration treatment solution contains a hydration inhibitor. The thickness of a hydrated film formed in the hydration step satisfies the following condition, 0.6≤t2/t1≤1, wherein t1 is the average thickness of the hydrated film formed in a depth range of up to 100 μm from the surface of the aluminum electrode, and t2 is the average thickness s of the hydrated film formed in a deep portion at least 100 μm from the surface of the aluminum electrode.

In an electrolytic capacitor having a capacitor element housed inside a body case where the capacitor element has a first electrode member and a second electrode member wound up with a separator in between and where the capacitor element holding an electrolyte solution, there is provided, between the first and second electrode members, a conductive polymer particle band in which conductive polymer particles of a conductive polymer in a dense state are disposed to extend in the longitudinal direction of the separator, the conductive polymer particle band contains a cellulose derivative, and the conductive polymer particle band is provided to cover, within at least one of regions on opposite sides of the center line of the separator in its lateral direction, one half or more of the region in the lateral direction.

An electrolytic capacitor includes an anode body including a dielectric layer, a cathode body, and a conductive polymer layer and a liquid component that are disposed between the anode body and the cathode body. The cathode body includes a base material part having an outer surface that is roughened surface and has a pore opened at the outer surface, and an inorganic conductive layer covering at least a part of the outer surface. The base material part includes a first coating layer disposed along at least a part of inner wall of the pore. The first coating layer contains phosphorus.

A method for manufacturing an electrolytic capacitor includes a first step, a second step, and a third step. In the first step, a capacitor element is formed. The capacitor element includes an anode body, a cathode body, and a separator. The anode body includes a dielectric layer formed on a surface of the anode body. And the separator is disposed between the anode body and the cathode body. In the second step, the capacitor element is impregnated with a treatment solution containing an acid component and a base component. In the third step, the capacitor element is, after the second step, impregnated with a conductive polymer dispersion in a state that a part of the treatment solution remains in the capacitor element. The conductive polymer dispersion is obtained by dispersing, in a solvent, conductive polymer particles each including polyanion. A pH of the treatment solution is higher than a pH of the conductive polymer dispersion.

An electrolytic capacitor includes a capacitor element. The capacitor element includes an anode body that includes a dielectric layer disposed at a surface of the anode body, a cathode body, and a separator disposed between the anode body and the cathode body. The capacitor element is impregnated with an electrolytic solution. A conductive polymer and a polyacrylic acid-based compound are provided on the dielectric layer.

A winding-type capacitor package structure and a method of manufacturing the same are provided. The winding-type capacitor package structure includes a winding assembly, a package assembly and a conductive assembly. The winding assembly includes a winding conductive positive foil and a winding conductive negative foil. The package assembly fully encloses the winding assembly. The conductive assembly includes a first conductive pin and a second conductive pin. The package assembly includes a casing structure, a filling body and a bottom enclosing structure. The casing structure has an accommodating space for receiving the winding assembly. The filling body is filled in the accommodating space for surrounding the winding assembly. The bottom enclosing structure is disposed on a bottom portion of the casing structure for carrying the winding assembly and enclosing the accommodating space. The bottom enclosing structure is surrounded by the casing structure and tightly connected to the filling body.

Provided is an electrolytic capacitor that can reliably exhibit redox capacity due to a conductive polymer layer of a cathode. The electrolytic capacitor includes: a cathode having a conductive substrate and a conductive polymer layer placed on the surface of the conductive substrate; an anode having a substrate composed of a valve metal and a dielectric layer composed of an oxide of the valve metal that is placed on the surface of the substrate, the anode being disposed such that the dielectric layer and the conductive polymer layer of the cathode are opposed to each other across a space; and an ion conductive electrolyte with which the space is filled, the conductive polymer layer of the cathode that is in contact with the ion conductive electrolyte exhibiting a redox capacity due to application of a voltage between the anode and the cathode, wherein the contact resistance between the conductive substrate and the conductive polymer layer in the cathode is 1 Ωcm.sup.2 or less.

An electrolytic capacitor is disclosed. In an embodiment an electrolytic capacitor includes an anode foil, a cathode foil, a working electrolyte arranged between the anode foil and the cathode foil, a polymer layer arranged on the anode foil, wherein the polymer layer comprises PEDOT:PSS and an intermediate electrolyte arranged between the polymer layer and the working electrolyte, wherein the intermediate electrolyte is different from the working electrolyte with respect to its composition.