JPH04134833U - solid electrolytic capacitor - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a desired capacitance without variation among multiple plate-type solid electrolytic capacitors using a conductive polymer film consisting of a chemically polymerized film and an electrolytically polymerized film as a solid electrolyte. be easily obtained. [Structure] A protrusion 1 is provided on one side of a square plate-shaped anode body 2,
The anode lead-out terminal 3 is attached to this protrusion 1, an insulating layer 4 is provided on this attaching portion, and a chemical polymer film 5 and an electrolytic polymer film 7 are sequentially formed on the surface of the anode body 2. As a result, a portion of the anode body 2 that contributes to the capacitance is transferred to the insulating layer 4.
It is now possible to use the information effectively without alienating it.
A highly reliable effect with no reduction in capacitance and no variation can be obtained.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention uses conductive polymer membranes such as chemically polymerized membranes and electrolytically polymerized membranes as solid electrolytes. This paper relates to flat plate solid electrolytic capacitors.

0002

[Conventional technology]

Film-forming gold such as aluminum or tantalum that has a dielectric oxide film on its surface For example, polypyrrole, polythiophene, polyaniline, polymer Solid electrolytic capacitors using conductive polymer membranes such as reflan as solid electrolytes are known. There is.

0003 Solid electrolytic capacitors using these conductive polymer films as solid electrolytes are One that uses a driving electrolyte that has become commonplace, or one that uses an organic semiconductor that has been attracting attention in recent years. Compared to solid electrolytic capacitors that use a conductor as a solid electrolyte, the temperature characteristics, frequency and Although the anode body has excellent properties such as high-temperature load characteristics (life), the flat anode body is superior to the laminated one. Or, it is difficult to obtain a large capacitance compared to the wound type due to shape constraints. I had a problem.

0004 However, the structures conventionally proposed for these flat solid electrolytic capacitors is an example in which the surface is roughened to form a dielectric oxide film as shown in Figures 5 and 6. For example, after attaching the anode lead terminal 11 near one side of the high-purity aluminum foil, For example, at the connection part of the anode lead terminal 11 of the square plate-shaped anode body 12 obtained by cutting the anode body 12 to a length of For example, a maleimide resin is applied and cured by heating to form the insulating layer 13, and then the anode A silicone tube 15 is attached to the base of the lead wire 14 constituting the extraction terminal 11. The root portion of the lead wire 14 is also insulated.

[0005] Next, a chemical polymer film, an electrolytic polymer film, and a cathode layer are sequentially formed on the 12 parts of the anode body. A cathode lead-out terminal is attached to the cathode layer, and a resin exterior is finally applied to create a finished product. It is.

[0006] However, solid electrolytic capacitors with the above configuration require a drive electrolyte. It does not have the ability to form a film like those using Anode extraction is performed to prevent the connection from increasing leakage current or causing short circuits. The formation area of the insulating layer 13 on the terminal 11 connection portion can be made uniform among a plurality of terminals without variation. It is extremely difficult to do this, and it is inevitable that there will be differences in the formation area of the insulating layer 13 between multiple layers. I didn't get it.

[0007] Therefore, the anode body 12 on the surface on which the insulating layer 13 is formed does not contribute to the capacitance at all. Therefore, variations in the area where the insulating layer 13 is formed directly induce variations in the capacitance characteristics. The result was that

[0008] Moreover, for the above-mentioned reason, that is, the surface on which the insulating layer 13 is formed does not contribute to the capacitance at all. Therefore, in order to secure the required capacitance, the size of the anode body 12 must be apparently large. However, given the strong demand for smaller, lighter, and thinner electronic components, it is difficult to say what is preferable. I couldn't. And, such a problem occurs as the anode body 12 becomes smaller. The proportion of the area covered by the insulating layer 13 increases, and the capacitance decreases accordingly. This tendency was more pronounced in those using a small anode body 12.

[0009]

[Problem that the idea aims to solve]

As mentioned above, the conductive polymer membranes of chemically polymerized membranes and electrolytically polymerized membranes that have been proposed in the past In flat plate solid electrolytic capacitors, which use a solid electrolyte of It is impossible to ensure sufficient capacitance, and in order to obtain the desired capacitance, the apparent The shape of the upper part had to be enlarged, which resulted in a big practical problem. there was.

0010 This invention was made to solve the above drawbacks, and the shape of the anode body was improved. By doing so, it is possible to ensure uniform capacitance, and the electronic components can be made shorter, smaller, and thinner. Using chemically polymerized membranes and electrolytically polymerized membranes as solid electrolytes, which can contribute to the demands of The object of the present invention is to provide a flat solid electrolytic capacitor made of solid electrolytic capacitors.

[0011]

[Means to solve the problem]

The solid electrolytic capacitor according to the present invention has a protrusion on one side and a dielectric oxide layer on the surface. An anode body made of a film-forming metal that has formed a film, and an anode drawer attached to the protrusion. A terminal, an insulating layer covering the attachment part of this anode lead-out terminal, and an anode lead-out of this insulating layer. The chemical polymer film formed on the entire surface except the vicinity of the terminal lead-out portion and the anode body, and An electrolytic polymer film formed on a composite film, a cathode layer formed on this electrolytic polymer film, and this cathode layer. A cathode lead-out terminal attached to the electrode layer, and the tips of this cathode lead-out terminal and the anode lead-out terminal. It is characterized by having an exterior that covers the entire surface except for.

0012

[Effect]

According to the solid electrolytic capacitor configured in this way, the anode lead terminal is connected to the anode body. Because it is attached to a protrusion provided and an insulating layer is provided on this attachment, the capacitance is reduced. It is easy to secure the required area for the anode body, which functions as an anode, and the static electricity is uniform and uniform. It becomes easier to secure capacity, and it greatly contributes to the demand for smaller, lighter, and thinner electronic components.

[0013]

【Example】

An embodiment of the present invention will be described below. In other words, as shown in Figure 2, For example, high-purity aluminum has protrusions 1 and a roughened surface to form a dielectric oxide film. For example, an anode lead terminal 3 is attached to the protrusion 1 of the rectangular plate-shaped anode body 2 made of aluminum foil. It is attached by ultrasonic welding, and then, as shown in FIG. For example, the insulating layer 4 is formed by applying and heating hardening a maleimide resin.

[0014] Therefore, the entire surface of the insulating layer 4 except for the vicinity of the anode lead-out terminal 3 and the anode The entire surface of two parts of the body was immersed in a 2 mol/liter pyrrole/ethanol solution for 5 minutes, After that, it was immersed in a 0.5 mol/liter ammonium persulfate aqueous solution for 5 minutes to Perform oxidative polymerization to form a chemically polymerized film 5 as a conductive polymer film as shown in FIG. do.

Next, a platinum wire 6 as a power supply electrode is brought into contact with a portion of the chemically polymerized film 5 located on the insulating layer 4 to serve as an anode, and 1 mol/liter of pyrrole monomer and paratoluenesulfone as a supporting electrolyte are added The lower part of the contact with the platinum wire 6 was immersed in an acetonitrile solution containing 1 mol/liter of sodium chloride, and a constant current was applied between it and an external cathode (not shown) to perform constant current electrolytic oxidation polymerization (1 mA/cm ² , 30 1) to form an electrolytic polymer film 7 as a conductive polymer film, as shown in FIG.

[0016] Next, colloidal carbon is applied to the surface of this electropolymerized membrane 7 and colloidal carbon is dried. A carbon layer 8 is formed, and then silver paste is applied to the surface of this colloidal carbon layer 8. is applied to form the cathode layer 9, and finally a resin sheath (not shown) is applied to form the solid electrolytic core. This is what gives you the power. In the figure, numeral 10 is a lead wire portion that constitutes an anode lead terminal. Ru.

[0017] According to the solid electrolytic capacitor constructed as described above, the square plate-shaped anode body 2 A protrusion 1 is provided on one side, an anode lead terminal 3 is attached to this protrusion 1, and an insulating layer 4 Since it has a structure in which the anode lead terminal 3 is attached to the protrusion 1, it functions as a capacitance. The area of the anode body 2 that can be This makes it easy to secure a uniform and necessary capacitance, and also allows for the desired short and small capacitance. It has the advantage of being able to meet the demand for lighter weight.

[0018] Next, a comparison of the characteristics of the present invention and the conventional example will be described based on experimental results. i.e. 5 and 6 as the present invention (A) manufactured according to the above embodiment and the above conventional technology. As a result of comparing the characteristics with the conventional example (B) referred to and explained, the results are as shown in Figure 7 and the table below. there were.

[0019] The aluminum foil dimensions of sample (A) are 60 μm thick and 1 mm x 1 m on one side. Using a 3mm x 3mm square with a square protrusion of m, after resin exterior The external dimensions are 1.5 mm thick x 4.3 mm wide x 6.0 mm long, and the rated voltage is 10 V. The sample (B) has aluminum foil dimensions of 1 mm x 1 mm on each side. Other parts are the same as sample (A) except that the 1 mm square protrusion is not provided. This is the setting. In addition, the number of samples is 30 for both (A) and (B), and the number of samples in the table is 30. Values are average values.

[0020]

[Table 1]

[0021] As is clear from Figure 7 and the table above, tan δ, leakage current, and short circuit failure rate are There is not much difference between the invention and the conventional example, but the capacitance characteristics of the invention are different both in absolute value and variation. It can be seen that this is significantly superior to the conventional example.

[0022] From this result, when comparing items of the same size, the product of this invention is compared to the conventional example. It is possible to increase the capacitance by about 37% or more, and from a different perspective, the same capacitance In order to obtain the capacity, the device of this invention can be made smaller, which is required as an electronic component. This means that it can greatly contribute to the reduction in size, size, and weight that are strongly demanded, and also reduces the variation in capacitance. In terms of ki, the inventive method has only a small amount, whereas the conventional method has a large amount. It was demonstrated that the results showed variations and were not practical.

[0023] Note that the above example uses maleimide resin as the insulating layer material. However, silicone resin, fluororesin, epoxy resin, or polyimide resin Of course, fat may also be used.

[0024]

[Effect of the idea] According to the present invention, it is easy to obtain a desired capacitance with no variation among multiple chemically polymerized membranes with high practical value that are suitable for shortening, lightening, and thinning. Flat-plate solid electrolyte using a conductive polymer membrane made of electrolytic polymer membrane as a solid electrolyte You can get a capacitor.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the element structure of a solid electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a lead terminal is attached to an anode body constituting an element of a solid electrolytic capacitor according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which an insulating layer is formed on the attachment portion of the anode body and the lead terminal, which constitute the element of the solid electrolytic capacitor according to the embodiment of the present invention.

FIG. 4 is a plan view for explaining a power supply means in electrolytic oxidative polymerization according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a state in which a lead terminal is attached to an anode body constituting an element of a solid electrolytic capacitor according to a conventional example.

FIG. 6 is a perspective view showing a state in which an insulating layer is formed on the attachment portion of an anode body and a lead terminal, which constitute an element of a solid electrolytic capacitor according to a conventional example.

FIG. 7 is a characteristic diagram showing capacitance distribution states of the present invention and a conventional example.

[Explanation of symbols]

1 Protrusion 2 Anode body 3 Anode lead terminal 4 Insulating layer 5 Chemically polymerized membrane 7 Electropolymerized membrane

Claims (2)

[Scope of utility model registration request] 1. An anode body made of a film-forming metal with a protrusion on one side and a dielectric oxide film formed on the surface, an anode lead-out terminal attached to the protrusion, and a mounting portion of the anode lead-out terminal. an insulating layer covering the insulating layer, a chemical polymer film formed on the entire surface of the insulating layer except for the vicinity of the anode lead-out terminal and the anode body, an electrolytic polymer film formed on the chemical polymer film, and an electrolytic polymer film formed on the chemical polymer film. A solid electrolyte comprising: a cathode layer formed on the cathode layer; a cathode lead terminal attached to the cathode layer; and an exterior covering the entire surface of the cathode lead terminal and the anode lead terminal except for the tips thereof. capacitor. 2. The solid electrolytic capacitor according to claim 1, wherein the insulating layer is made of maleimide resin, silicone resin, fluororesin, epoxy resin, or polyimide resin.