JPH09275043A - Aluminum electrolytic capacitor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost aluminum electrolytic capacitor which enables coloring by any color and laser marking using simplified material and apparatus without requiring a thermo-contraction tube and also provide a method of manufacturing the same capacitor. SOLUTION: An aluminum plate 1, which is formed by laminating a polyamide or polyester based hot melt resin 2 mixing a pigment or laser coloring material having the melting point of 140 to 200 deg.C and breakdown elongation of 300% or more, is squeezed to form an aluminum case 1a using the hot melt resin 2 as the external side. This aluminum plate 1 is used to form an aluminum electrolytic capacitor. Thereby, coloring and laser marking can be realized without using thermal contraction tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor used in various electronic devices and a method for manufacturing the same.

[0002]

2. Description of the Related Art Most of the aluminum electrolytic capacitors that have been used so far have a heat-shrinkable tube made of vinyl chloride resin that covers and seals the aluminum case. For surface mount types and tubeless types, 6 nylon is used. The film was produced by using an aluminum case obtained by laminating a film on an aluminum plate, remelting the film and laminating the film, and drawing the aluminum case.

[0003]

However, in the conventional aluminum electrolytic capacitor and the manufacturing method thereof, the one in which the 6 nylon film is laminated costs about twice as much as the aluminum plate alone, and the heat shrinkage of the vinyl chloride resin. The cost was still high compared to products using tubes.

In addition, it is desirable to limit the use of heat-shrinkable tubes of vinyl chloride resin from the viewpoint of environmental protection.
It had many challenges.

[0005]

The present invention is intended to solve the above-mentioned conventional problems, and is a polyamide or polyester hot melt resin having a melting point of 140 to 200 ° C. and a breaking elongation of 300% or more. And an aluminum electrolytic capacitor using an aluminum case having the hot melt resin layer as an outer side, and a method for manufacturing the same.

According to the present invention, it is possible to obtain an inexpensive aluminum electrolytic capacitor which does not use a vinyl chloride resin and does not require a heat-shrinkable tube.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a bottomed cylindrical aluminum case having a hot melt resin layer formed on an outer peripheral surface including a bottom surface, and lead terminals for external connection respectively. Wrap the anode foil and cathode foil connected to each other through electrolytic paper, insert the capacitor element inserted in the aluminum case together with the electrolytic solution and the lead terminals of this capacitor element into the upper part of the aluminum case. The heat-shrinkable tube made of vinyl chloride resin is not needed.

According to a second aspect of the invention, in the first aspect of the invention, the hot melt resin layer formed on the aluminum case has a melting point of 140 to 200 ° C. and an elongation at break of 300.
%, Which is a polyamide hot melt resin having a property of not less than%, and has an effect of eliminating the need for a heat shrink tube made of vinyl chloride resin.

According to a third aspect of the invention, in the first aspect of the invention, the hot-melt resin layer formed on the aluminum case has a melting point of 140 to 200 ° C. and a breaking elongation of 300.
%, Which is a polyester hot melt resin having characteristics of not less than%, and has an effect of eliminating the need for a heat-shrinkable tube made of vinyl chloride resin.

A fourth aspect of the present invention is the invention according to any one of the first to third aspects, in which a coloring pigment is added to the hot melt resin layer formed on the aluminum case. , Has the effect of being able to distinguish and recognize.

According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, a laser coloring material for coloring is added to a hot melt resin layer formed on an aluminum case. And has the effect of enabling laser marking.

According to a sixth aspect of the present invention, in the second aspect of the invention, a polyamide hot melt resin is prepared by adding at least one of a pigment and a laser coloring material onto the polyamide hot melt resin layer formed on an aluminum case. It has a structure in which layers are laminated, and has an effect of improving the insulating property, the withstand voltage, and the mechanical strength.

According to a seventh aspect of the invention, in the third aspect of the invention, a polyester hot melt resin in which at least one of a pigment and a laser coloring material is added to the polyester hot melt resin layer formed on an aluminum case. It has a structure in which layers are laminated, and has an effect of improving the insulating property, the withstand voltage, and the mechanical strength.

According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, a hot-melt resin is applied to one surface of an aluminum plate and heat-fused to form a hot-melt resin layer. Anode foil with the lead terminals for external connection connected to each aluminum case by drawing the formed aluminum plate so that the hot melt resin layer is on the outside and creating a cylindrical aluminum case with a bottom. After inserting the capacitor element in which the cathode foil is wound with electrolytic paper together with the electrolytic solution, insert the lead terminal of the capacitor element and fit the sealing rubber on the upper part of the aluminum case to seal and assemble. This is a manufacturing method, and has an effect of not causing a defect due to drawing.

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an essential part of an aluminum case used for the aluminum electrolytic capacitor in the embodiment, FIG. 2 is a partial sectional view of a hot-melt resin laminated aluminum plate used for the aluminum case, and FIG. 5 is the same case. It is sectional drawing which shows the structure of the used aluminum electrolytic capacitor.

FIG. 1 shows the above-mentioned aluminum case, in which the hot-melt resin 2 is directly applied to the aluminum plate 1 with a thickness of 30 to 50 μm by a hot-melt coater or the like and heated at a predetermined temperature to form a laminate. The aluminum plate 1 having the hot melt resin 2 laminated thereon is drawn into a predetermined shape so that the hot melt resin 2 is on the outside, thereby forming an aluminum case 1a.

The material forming the aluminum case 1a is a hot-melt resin 2 laminated on an aluminum plate 1 as shown in FIG.
As a polyamide hot melt resin, Platabond M1425F (Made by Atchem Germany, melting point 145-15
(5 ° C.) and 3 PHR of titanium oxide as a color pigment 3 are put into a hot melt coater tank, mixed, and heated and melted at 240 ° C. and preheated to 170 ° C., thickness 0.3 m
The aluminum plate 1 having a thickness of 40 μm is applied and laminated at a speed of 3 m / min.

FIG. 5 shows an example of an aluminum electrolytic capacitor in which the aluminum case 1a is degreased with alkali. In FIG. 5, 5 is a capacitor element made of electrolytic paper or aluminum foil, 6 is an electrolytic solution, and 7 is Draw-out lead wire, 8 is a bent sealing part, 9 is a body narrowing part for sealing, and 1
0 is a sealing rubber.

Further, the aluminum electrolytic capacitor using the aluminum case 1a of φ5 mm × 6 mm formed by the laminated aluminum plates 1 has no mechanical trouble in the structure (peeling of hot melt resin, etc.) and is on a 160 ° C. hot plate. There was no abnormality in the reflow for 5 minutes.

(Embodiment 2) FIG. 3 is a partial sectional view of a hot-melt resin laminated aluminum plate used for an aluminum case according to the same embodiment. In FIG. 3, a hot-melt resin 2 is a polyester hot-melt resin or Aron melt. PES140H (manufactured by Toagosei, melting point 140-150
)) And 4 PHR of finely ground iron hydroxide as a laser coloring material 4 are put into a hot melt coater tank and mixed, and 220
The aluminum plate 1 having a thickness of 0.3 mm preheated to 160 ° C. was melted and applied at a rate of 5 m / min to a thickness of 35 μm to form a laminate.

In the aluminum electrolytic capacitor formed by the same method as described above, fine peeling occurs in the bent sealing portion 8, but there is no problem in practical use and there is no abnormal reflow.

In the above embodiment, the hot melt resin 2 has a melting point of 140 to 200 ° C. and a breaking elongation of 300.
% Or more, it is made of polyamide or polyester, but it is 140 to 150 ° C due to solder reflow in mounting as an aluminum electrolytic capacitor, and 200 ° C or less due to hot work coater coating workability and deterioration due to oxidation. Desirability and adhesion to the aluminum plate 1 are required, and the elongation of the material is about 20% when the aluminum case 1a is drawn, but the bending sealing portion 8 is preferable. This is because the aluminum plate 1 and the hot melt resin 2 are both stretched by nearly 300%.

This is also because the aluminum case 1a needs to have chemical resistance to withstand alkaline degreasing after processing and cleaning after mounting.

For coloring, the coloring pigment 3 may be added to the hot melt resin 2 in an amount of 5 parts by weight or less.
White is titanium oxide or zinc oxide, black is carbon, brown is red iron oxide, and green is copper phthalone cyanine.
As long as the color does not change at 0 ° C, it can be used, and any color can be applied.

If iron hydroxide is mixed with the hot-melt resin 2 as the laser coloring material 4, it is changed into iron oxide by laser irradiation, and laser marking by brown coloring becomes possible.

(Embodiment 3) As shown in FIG. 4, a pigment and a laser are provided on the outside of a hot-melt resin 2 of polyamide or polyester having the same melting point as described above and a breaking elongation of 300% or more at 140 to 200 ° C. An aluminum plate 1 formed by laminating a polyamide or polyester hot melt resin 2a to which at least one of coloring materials is added,
An aluminum case 1a is obtained by drawing a hot melt resin 2a into a predetermined shape so that the hot melt resin 2a is on the outside.

The characteristics of the polyamide or polyester hot melt resin 2a added with a pigment or a laser coloring material do not necessarily have to satisfy the above characteristics, and the thickness may be smaller than that of the inner hot melt resin 2. .

If the hot melt resin 2a having the same characteristics as described above is used, the inside and the outside of the hot melt resin 2 can be reversed.

[0030]

As described above, according to the aluminum electrolytic capacitor and the method of manufacturing the same according to the present invention, a heat shrinkable tube of vinyl chloride resin is not necessary, solder reflow is possible, and it can endure a bending and sealing process. The construction method has the effect of making the product and the device inexpensive.

Further, there is an effect that arbitrary coloring is possible, layer management and various tracking management are easy, laser marking and laser marking are possible, and process control such as product type switching is reliable and easy.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an aluminum case of an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of the hot-melt resin laminated aluminum plate.

FIG. 3 is a partial cross-sectional view of another hot melt resin laminated aluminum plate.

FIG. 4 is a sectional view of a main part of another hot-melt resin laminated aluminum case.

FIG. 5 is a sectional view showing the structure of an aluminum electrolytic capacitor using the same aluminum case.

[Explanation of symbols]

 1 Aluminum Plate 1a Aluminum Case 2 Hot Melt Resin 2a Hot Melt Resin 3 Coloring Pigment 4 Laser Coloring Material 5 Capacitor Element 6 Electrolyte 7 Lead Wire 8 Bending Sealing Section 9 Body Drawing Section 10 Sealing Rubber

Claims (8)

[Claims] 1. A bottomed cylindrical aluminum case having a hot melt resin layer formed on its outer peripheral surface including a bottom surface, and an anode foil and a cathode foil, to which lead terminals for external connection are respectively connected, through electrolytic paper. Aluminum electrolytic capacitor consisting of a capacitor element that is wound around and then inserted into the aluminum case together with an electrolytic solution, and a sealing rubber that is inserted into the upper part of the aluminum case by inserting the lead terminals of the capacitor element and sealing the aluminum case. . 2. The hot melt resin layer formed on the aluminum case has a melting point of 140 to 200 ° C. and a breaking elongation of 300.
The aluminum electrolytic capacitor according to claim 1, which is a polyamide hot melt resin having a characteristic of not less than%. 3. The hot melt resin layer formed on the aluminum case has a melting point of 140 to 200 ° C. and a breaking elongation of 300.
The aluminum electrolytic capacitor according to claim 1, which is a polyester hot melt resin having a characteristic of not less than%. 4. The aluminum electrolytic capacitor according to claim 1, wherein a coloring pigment is added to the hot melt resin layer formed on the aluminum case. 5. A laser coloring material for coloring is added to a hot melt resin layer formed on an aluminum case.
3. An aluminum electrolytic capacitor as described in any one of 3. 6. The aluminum electrolytic capacitor according to claim 2, wherein a polyamide hot melt resin layer containing at least one of a pigment and a laser coloring material is laminated on a polyamide hot melt resin layer formed on an aluminum case. 7. The aluminum electrolytic capacitor according to claim 3, wherein a polyester hot melt resin layer containing at least one of a pigment and a laser coloring material is laminated on a polyester hot melt resin layer formed on an aluminum case. 8. An aluminum plate is coated with a hot melt resin on one side and heat-fused to form a hot melt resin layer, and the aluminum plate is drawn so that the hot melt resin layer is on the outside. After creating a cylindrical aluminum case with a bottom and inserting an anode foil and a cathode foil, which have lead terminals for external connection connected to them respectively, through electrolytic paper into the aluminum case, insert the capacitor element together with the electrolytic solution. 8. The method of manufacturing an aluminum electrolytic capacitor according to claim 1, wherein the lead terminal of the capacitor element is inserted, and a sealing rubber is fitted on an upper portion of the aluminum case to seal and assemble.