JPS62150815A - Solid electrolytic capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to solid electrolytic capacitors used in consumer and industrial electronic equipment.

Conventional technology In general, solid electrolysis: JNdensa uses a valve metal such as tantalum or aluminum as an electrode body, forms a dielectric oxide film on this, and roughly forms an electrolytic Mffi such as manganese dioxide on the upper surface. Torture, sequential carbon layers, A
g Conductive paint cathode layer etc. are formed and a capacitor element is used, and the protruding lead wire of this capacitor element is gold jil VIA.
/#l is connected to the terminal part by means such as welding, and on the other hand, the connection between the capacitor element cathode part and the metal cathode terminal part is made by placing a certain amount of Ag conductive adhesive on the surface of the metal cathode terminal part in advance.
The capacitor element cathode part was placed on top of this, or conversely, a conductive adhesive was placed on the capacitor element cathode part in advance and overlaid, and then the resin exterior and terminal processing were performed. .

Problems to be Solved by the Invention Generally, the above conductive adhesives and paints use ACI as a conductive material, and an organic polymer material is mixed therein as a binder for each particle and as a coating film forming agent. , AC1 particles have excellent electrical conductivity and are therefore considered to be excellent conductive adhesives or paints. however,
A (7) is a stable metal compared to other metals such as copper, but it does not come into contact with oxidizing substances at high temperatures or is exposed to H2S.
,S.

2. When exposed to gases such as NO2, it is easily attacked, and oxidation progresses, reducing conductivity and increasing the resistance of the content. In addition, when this adhesive is used to connect the cathode part of the Content 4 element and the metal cathode terminal, it is difficult to accurately recognize the area and amount of Aq adhesive applied because both have the same metal color. The stable and strong connection made it hard to be disappointed.

The present invention solves the above-mentioned problems, and aims to provide a solid electrolytic capacitor that has stable characteristics even at high temperatures, can be produced with good productivity, and can be obtained at low cost.

Means for Solving the Problems In order to solve the above problems, Kikomei used A (90 to 99 (wt) parts of 7 as a highly conductive material and 1 to 10 (wt) parts of carbon as a reducing conductive material). ) A black or black-gray conductive adhesive or paint is used as a cathode material by mixing and kneading a fine powder conductive material consisting of a part with a polymeric material necessary for bonding the material particles and forming a coating film. It is used as an adhesive material or as an adhesive material to form the cathode layer of a capacitor and connect the cathode part of the capacitor element to the terminal.

Effect: With the above structure, carbon has high electrical conductivity, has a reducing effect at high temperatures, and has a gas adsorbing effect, so by keeping it in contact with Aq fine particles, Ag can be prevented from oxidizing. Capacitor resistance does not increase even when exposed to high temperature environments. Further, when used to bond a terminal made of a metal material to a capacitor element cathode part, since the color is black or blackish gray, which is different from the metal color, it has the advantage that the coated area and hanging can be easily identified.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, 1 is a capacitor element, with an electrode body 2 made of metal such as tantalum or aluminum, on which a dielectric oxide layer 3 is formed, an electrolyte layer 4 made of manganese dioxide or the like is formed on the upper surface, and then a carbon After forming layer 5, 5-10 micron A(j fine particles 95 (wt
) parts of conductive powder obtained by mixing 5 (Wt) parts of fine carbon powder to 4414100100 (parts), 9 (1) parts of PMM (polymethyl methacrylate) dissolved in xylene was added and kneaded. The obtained carbon-containing conductive paint 6 was applied to form a cathode layer.

Reference numeral 7 denotes an anode lead terminal, which is connected to an anode protruding lead wire 8 led out from the electrode body 2 of the capacitor element 1 by means such as welding. 9 is a cathode lead terminal, which is the carbon-containing 3# mentioned above.
The capacitor element 1 is bonded to the surface of the capacitor element 1 on the paint 6 using a carbon-containing conductive adhesive 10 made of the same components as the P-conductive paint 6. 11 is an insulating resin exterior.

Table 1 shows the changes in the an δ characteristic of the capacitor formed in this manner when exposed to high temperatures when compared with that of a capacitor formed by a conventional method.

Table 1 C10V, 4.611F(7)':J
Obtain the tan δ characteristics when the sample was left in an atmosphere of 300'C(7)f and measured at 1 llz.

[Margin below]

Table 1 Next, Table 2 shows the results of examining the high temperature characteristics of a capacitor using the carbon-containing conductive paint and adhesive according to the present invention, depending on the mixing ratio of Ag powder and carbon powder. In Table 2, it is 16V.

A capacitor of 4.7 gF was used.

[Margin below] Table 2 In Table 2, the mixing ratio of carbon is 1 to 10 (
It was confirmed that the tan δ of the capacitors in the wt)% range is small and changes little with respect to heat.

Even if an epoxy resin or the like is used as the 8-molecule material, the same effect can be obtained.

Effects of the Invention According to the present invention, since carbon acts to prevent /'l from oxidation, tanδ decreases when exposed to high WU.
A very stable capacitor with little change in characteristics can be obtained. In addition, since the conductive adhesive and paint are black or black-gray, when used for connection with metal terminals, the color will be different from the metal color of the terminal, so it is easy to determine the area and amount of the adhesive and paint to be applied. This increases the precision of quantity and provides stable capacitors.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

Claims (1)

[Claims] 1. 90 to 99 (wt) parts of Ag as a highly conductive material,
A black color made by mixing and kneading a fine powder conductive material containing 1 to 10 (wt) parts of carbon as a reducible conductive material with a polymeric material necessary for bonding the material particles and forming a coating film. or solid electrolytic capacitors using black-gray conductive adhesive or paint as cathode material or as adhesive material.