JPS63107A - 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] [Object of the invention J (Industrial application field) The present invention relates to an electrolytic capacitor having a novel configuration.

(Prior Art) In general, a dry type thin electrolytic capacitor is constructed by connecting a pair of anode and cathode foils made of aluminum foil with a pair of lead terminals made of the same (aluminum), and interposing a spacer between the pairs of II cathode and cathode foils. The foil is then impregnated with a driving electrolyte, placed in a case, and the opening of the case is sealed.-Generally, the purpose of intervening a spacer is to provide insulation isolation between a pair of anode and cathode foils. and retention of the driving electrolyte, which are important structural requirements for dry type thin electrolytic capacitors.The commonly used spacer is kraft paper, but the kraft paper has a density of 0. 3~
It has a relatively high density of 0.8 g/υ3, and the cross-sectional shape of the m fibers that make up kraft paper is flat, so the apparent resistivity increases, impairing the tan δ property. The problem is that the thickness is over 30 μm, and it cannot be made any thinner, which is a factor that hinders miniaturization, and it also causes overvoltage.

It had drawbacks such as the risk of ignition and continued combustion when the capacitor was destroyed due to the application of a reverse voltage. Therefore, there is currently a trend to use low-density manila paper instead of kraft paper, which greatly contributes to improving tanδ properties. However, manila paper is several times more expensive than kraft paper, and in addition, it has poor strength after papermaking. In order to withstand the manufacturing process of capacitors (particularly the winding process), a thickness of 40 μm or more must be used, which remains an impediment to miniaturization.

Furthermore, since a liquid driving electrolyte is used, there is a limit to the improvement of tanδ characteristics.Furthermore, liquid driving electrolytes tend to increase resistivity at low temperatures, resulting in extremely poor low-temperature characteristics and are used over a wide temperature range. Not only do they have problems that need to be solved in practice, such as a lack of reliability, but the element shape is a wound type.
Furthermore, since the structure had a lead-out terminal inserted midway, it also had the problem of poor frequency characteristics.

Therefore, in recent years, for example, Japanese Patent Application Laid-Open No. 58-17609, Japanese Patent Application Laid-Open No. 58-191414, or Japanese Patent Application Laid-Open No. 59-63
As disclosed in Publication No. 604, N-propyl (or N~iso-propyl)isoquinoline, N-edylysoquinoline, N-butylisoquinoline, and a hydrocarbon at the N position were used instead of the driving electrolyte. quinoline substituted with groups,
TCNQtO consisting of isoquinoline or pyridine, etc.
It has been proposed to use the body as a solid electrolyte with improved properties. Electrolytic capacitors using such TCNQ complexes are generally used by melting and impregnating these TCNQ complexes, but since the TCNQtW body is heated for a long time when melting and impregnating, the conductivity of the TCNQ complex is There is a problem with the tan δ characteristics because - tends to decrease, and since the element shape is the conventional type in which the lead terminal is inserted in the middle of the winding, the characteristics at high frequencies are poor.Moreover, because a spacer is used, the positive and There still remained problems to be solved, such as the gap between the cathodes being wide (approximately 40 to 50 μm) and the resistance being large.

Therefore, the inventor of the present invention filed Japanese Patent Application No. 1983-78649 for the purpose of eliminating the various drawbacks mentioned above. That is, in the prior art, as shown in FIG. 4, an anodic oxide film 24 is formed on the surface of a valve metal film 23 which is formed on one surface of an insulator 21 with one end as a margin 22, and then the anodic oxide film g ! The TCNQ complex 812 is placed on the surface of the blank area 22 from the surface of the blank area 24 excluding the end face located on the opposite side of the blank area 22.
A cathode electrode f126 is formed on the surface of the TCNQ complex film 25 excluding the end surface located on the opposite side of the margin portion 22.
As shown in FIG.
The electrode lead portions 28 are formed on both end faces, which greatly contributes to improving the characteristics. 29
is an external terminal. However, in the electrolytic capacitor having the above-mentioned structure, one electrode lead-out portion 28 serving as an anode has only an area valve with a thickness of 10 μm at the end of the valve-action metal film 23, and the valve-action metal film 23 is made of aluminum and the electrode lead-out portion 28 The contact resistance is large due to the electrical connection caused by contact with the silver adhesive, and in extreme cases, contact failure occurs, resulting in a loss of tan δ characteristics as a capacitor.

(Problems to be Solved by the Invention) As described above, by using the TCNQ complex and making the element shape non-inductive, it is possible to improve the characteristics compared to the conventional technology, but the anode extraction structure There was a problem.

The present invention has been made in view of the above points, and an object of the present invention is to provide an electrolytic capacitor with a novel configuration that improves the contact structure between the valve metal and the electrode lead-out portion that serves as the anode, and stabilizes various characteristics. That is.

[Structure of the Invention] (Means for Solving the Problems) The electrolytic capacitor of the present invention has a valve action base a film formed on one or both surfaces of an insulator with one end face as a margin, and the margin of the metal film is An anodic oxide film is formed on the surface except for one end face located on the opposite side to the valve part, a TCNQ complex film is formed on the oxide film, and a cathode electrode film is formed on the complex film and on the blank part surface. An anode electrode film is formed on the working metal film surface without contacting the oxide film, and a plurality of double film layers are laminated with a resin film formed on the surface including the anode electrode film and the cathode electrode film,
Electrode extensions are formed on both end faces.

(Function) According to the electrolytic capacitor configured as described above, the valve action metal 8 film serving as the anode and the electrode lead-out portion are structured via the anode electrode film provided on the valve action metal crotch, so the contact area between the two is small. It is possible to secure a large value, reduce electrical resistance, and obtain tan δ characteristics with excellent variation.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

That is, as shown in FIG. 2, aluminum metal is coated on one side of an insulating material 1 such as a plastic film/sheet or ceramic sheet made of polyester, triacetate, tetrafluoroethylene, polycarbonate, polyamide, polyimide, etc., with one end being a blank space 2. After vapor-depositing or laminating to form a valve metal film 3, the surface of the valve metal film 3 except for one end face located on the side opposite to the margin 2 is anodized to form an anodic oxide film 4, After that, for example, 2.2'
-bipyridinium (TCNQ), 4-hydroxy-N-penzylanilinium (TCNQ) 2.4-
Amino-2,3,5,6-titramethylanilinium (
TCNQ), pyridinium (TCNQ),
4-cyano-N methyl-pyridinium <TCNQ)
, N-ethylquinolinium (TCNQ), N
A TCNQ complex made of -(2-phenethyl)quinolinium (TCNQ) 2 or the like is vacuum deposited to form a TCNQ complex model 5. Next, a metal such as silver or copper is applied to the cathode electrode W on the TCNQ complex Wi5 surface and the two blank surfaces by screen printing, vapor deposition, or sputtering.
A6 is formed, and an anode electrode film 7 is formed on the surface of the valve metal film 3 on which the anodic oxide film 4 is not formed, without contacting the anodic oxide film 4, by the same means as the cathode electrode film 6 forming means. , the anode electrode film 7 and the cathode [! For example, an epoxy resin is screen printed on the surface including 6 to obtain a multilayer layer 9 in which a resin film 8 is formed. The required number of multiple FJ tanks 9 are stacked as shown in FIG. The terminal 11 is attached and housed in a case or coated with resin or the like to form an exterior (not shown).

The electrolytic capacitor constructed as described above has a structure in which the RA electrode electrode film 7 formed on the valve metal film 3 serving as the anode is connected to the electrode lead-out part 10, and the connection part between the two at the connection part is Since the contact area is large and can be secured reliably, the electrical resistance of the connection part is small and the factors that inhibit the tan δ characteristics are eliminated, and in addition to being able to obtain excellent tan δ characteristics with no variation, the element configuration is spacer-less and can be used for driving electrolysis. Since it does not use liquid and is of the N iR conduction type, both temperature characteristics and high frequency characteristics are significantly improved compared to conventional examples.

Next, an example of comparison between an example of the present invention and a reference example will be described.

EXAMPLE Using an aluminum laminate film in which aluminum was laminated to a thickness of 10 μm on one side of a polyester film, 2,2'-bipyridinium (TCNQ)2 was vacuum-deposited as a TCNQ complex. Both the cathode electrode film and the anode electrode film are screen-printed with Ag paste and screen-printed with epoxy resin. A plurality of multi-film layers are laminated as shown in Fig. 2, metallicon electrodes are applied to both end faces, and epoxy resin is used as the exterior structure. Rated 25WV coated with
1μF electrolytic capacitor (A).

Reference Example Using an aluminum laminate film in which aluminum was laminated to a thickness of 10 μm on one side of a polyester film, 2,2′-bipyridinium (TCNQ) 2 was vacuum-deposited as a TCNQ complex. As a cathode electrode film, a plurality of 81 multi-film layers with the configuration shown in Figure 4, in which paste was screen printed, epoxy resin was screen printed, and epoxy resin was screen printed, metallicon electrodes were applied to both end faces, and the exterior was Electrolytic capacitor (B) with a rating of 25 WV 1 μF and coated with epoxy resin.

The various characteristics of the embodiment (A) according to the present invention and the conventional reference example (B) were investigated and the results are shown in the numerical table. The number of samples is 20 for both (A)<8).

Below Margin The capacitance, tan δ, and I leakage current in the table above are average values, and the values in parentheses for contact resistance and tan δ indicate variations.

As is clear from the table above, Example (A) is Reference Example (B)
Compared to the above, the variation in contact resistance between the anode and the metallicon electrode is extremely small, and the variation in tan δ is also small.
Therefore, the tan δ characteristics were excellent, demonstrating the excellent effects of the present invention.

In the above embodiment, the valve action metal film is provided on one side of the insulator, but it is of course applicable to a case where the valve metal film is provided on both sides.Also, in the above embodiment, aluminum metal is used as the anode electrode film. Although the explanation has been given by exemplifying a valve metal made of tantalum, titanium, niobium, etc., the same effect can be obtained using a valve metal such as tantalum, titanium, niobium, or the like.

[Effect of the invention 1 As described above, according to the configuration of the present invention, by providing an anode electrode film on the valve metal film surface as an anode lead-out structure, the tan δ characteristic can be improved and TCNQ can be achieved without a spacer.
By using the II body, it is possible to obtain an electrolytic capacitor of high practical value as a non-inductive type.

[Brief explanation of the drawing]

Figures 1 and 2 relate to one embodiment of the present invention, with Figure 1 being a front cross-sectional view showing an electrolytic capacitor, Figure 2 being a perspective view showing a multi-layered film constituting Figure 1, Figure 3, and FIG. 4 is a reference example, FIG. 3 is a front sectional view showing an electrolytic capacitor, and FIG. 4 is a perspective view showing a double II layer constituting FIG. 3. 1... Insulator 2... Margin 3... Valve metal film 4... Anodic oxide film 5... TCNQ&I body 1I 6・
...Cathode electrode film 7 ...Anode electrode gl
8...Resin film 9...Double film layer
10... Electrode extraction part patent granted
wish person

Claims (1)

[Claims] (1) A valve metal film formed on one or both sides of an insulator with one end surface as a margin, and an anodized film formed on the surface of the metal film excluding one end surface located on the opposite side of the margin. , a TCNQ complex film formed on the oxide film, a cathode electrode film formed on the complex film and on the blank surface,
a double film layer consisting of an anode electrode film formed on the valve metal film surface without contacting the oxide film; and a resin film formed on the surface including the anode electrode film and the cathode electrode film; An electrolytic capacitor characterized by comprising a plurality of laminated film layers and electrode lead-out portions formed on both end faces.