JPH04223317A - Aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To improve productivity and to prevent generation of cracks on an anode cap by forming a plurality of square-shaped plate-like anode case, a cathode case is formed by bending in zigzags, and electrolytic paper is assembled and formed into a tabular plate. CONSTITUTION:An aluminum electrolytic capacitor 1 is provided with a plurality of square-shaped tabular anode cases 2, a cathode case 3 which is formed by bending in zigzags, and an electrolytic paper 4 which is formed by bending in zigzags. A sheet of electrolytic paper 4 is inserted into the cathode case 3, the anode cases 2 are inserted into the electrolytic paper 4, and they are formed in tabular shape by assembling. Also, the cathode case 3 is folded twice the number of sheets of the anode case 2 pinching the anode case 2 through the intermediary of the electrolytic paper, and both sides of the anode case 2 are formed in such a manner that they are covered by the cathode case 3. Also, the aluminum electrolytic capacitor element 1 is put in a bag-like sheet 7, and it is pinched by the housing material 9 consisting of the elastic material such as rubber having a housing chamber 8.

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 general electronic equipment, and more particularly to a flat aluminum electrolytic capacitor.

0002

[Prior Art] Generally, in an aluminum electrolytic capacitor, an aluminum electrolytic capacitor element is constructed by winding band-shaped anode foil and cathode foil with electrolytic paper interposed therebetween. A cylindrical aluminum electrolytic capacitor is installed in a cylindrical metal case with a bottom, and the open end of the metal case is sealed with a sealing member, and a band-shaped anode foil and cathode foil are wrapped with electrolytic paper. A flat aluminum electrolytic capacitor is formed by compression molding an aluminum electrolytic capacitor element constructed by intervening and winding it, and an anode foil and a cathode foil are stacked alternately with electrolytic paper interposed between them. A flat aluminum electrolytic capacitor in which an aluminum electrolytic capacitor element is formed into a flat plate has been proposed.

0003

[Problems to be Solved by the Invention] However, when the above-mentioned cylindrical aluminum electrolytic capacitor is required to be made smaller, the anode foil and the cathode foil are strongly etched. A common method is to expand the surface area of the foil and make the electrolytic paper thinner. In this case, the strength of the anode foil that has been strongly etched becomes weaker, so Another problem is that cracks occur in the anode foil when the electrolytic paper is wound, and the possibility of dielectric breakdown occurring between the anode foil and the cathode foil increases as the electrolytic paper becomes thinner. It had a point.

[0004] Furthermore, when the density of components used in various electronic devices increases, the mounting efficiency of cylindrical aluminum electrolytic capacitors deteriorates, and as a countermeasure to this problem, flat aluminum electrolytic capacitors have been proposed. However, in this flat-shaped aluminum electrolytic capacitor, when an aluminum electrolytic capacitor element constructed by winding band-shaped anode foil and cathode foil with electrolytic paper interposed is processed into a flat shape by compression molding, the winding There was a problem in that the anode foil was subjected to more load than it was rotated, making it more likely to crack.

In order to solve these problems, a flat aluminum electrolytic capacitor was developed in which an aluminum electrolytic capacitor element was formed into a flat plate by alternately overlapping anode foils and cathode foils with electrolytic paper interposed therebetween. has been proposed, but this flat plate-shaped aluminum electrolytic capacitor is more complex to manufacture than the conventional rolled cylindrical aluminum electrolytic capacitor, resulting in lower productivity and higher costs. There was a problem.

The present invention is intended to solve these problems, and aims to provide an aluminum electrolytic capacitor that has good productivity and does not cause cracks in the anode foil.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the aluminum electrolytic capacitor of the present invention comprises a plurality of rectangular plate-shaped anode foils, a cathode foil formed by bending them in a zigzag pattern, and a cathode foil formed by bending them in a zigzag shape. A flat aluminum electrolytic capacitor element is constructed by combining the folded electrolytic paper and the aluminum electrolytic capacitor element is placed in a bag-shaped sheet, and the bag-shaped sheet is housed in the aluminum electrolytic capacitor element. This storage member is inserted into a square case with an open end at one end, and a square cap is placed over the open end of the case. It is sealed.

[0008]

[Operation] According to the above structure, a flat aluminum electrolytic film is produced by combining a plurality of rectangular plate-shaped anode foils, cathode foils formed by bending them in a zigzag pattern, and electrolytic paper formed by bending them in a zigzag pattern. Because it constitutes a capacitor element, even if the anode foil is strongly etched, the anode foil will not crack unlike the case with winding, and the cathode foil and electrolytic paper can be folded in a staggered manner. Because of this, the electrolytic paper and plate-shaped anode foil can be inserted smoothly, and the aluminum electrolytic capacitor element is placed inside a bag-shaped sheet, and this bag-shaped sheet is
The aluminum electrolytic capacitor element is sandwiched between a storage member made of an elastic body and provided with a storage chamber, and this storage member is further inserted into a rectangular case with an open end, and the open end of the case is inserted. Since the aluminum electrolytic capacitor is constructed by covering the cap with a rectangular cap and sealing it, its productivity is very high and it can be obtained at a low cost.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 5, 1 is an aluminum electrolytic capacitor element, and this aluminum electrolytic capacitor element 1 is
As shown in FIG. 5, it includes a plurality of plate-shaped anode foils 2 having a rectangular shape, cathode foils 3 formed by bending in a staggered manner, and electrolytic paper 4 formed by bending in a staggered manner. An electrolytic paper 4 is inserted into the cathode foil 3, and a plurality of plate-shaped anode foils 2 are inserted into the electrolytic paper 4, and these are combined to form a flat plate. Furthermore, the plurality of plate-shaped anode foils 2 are each provided with ears 2a, 2b, and 2c on their edges to connect anode lead leads,
In addition, these ears 2a, 2b, and 2c are provided at shifted positions so that they do not overlap when a plurality of plate-shaped anode foils 2 are stacked.

Further, the cathode foil 3 formed by bending in a staggered manner is folded into twice the number of sheets of the anode foil 2 so as to sandwich the plate-shaped anode foil 2 with the electrolytic paper 4 interposed therebetween, and Both sides of the anode foil 2 are covered with a cathode foil 3 via an electrolytic paper 4, and the cathode foil 3 is further provided with a cathode lead 5.

Furthermore, the electrolytic paper 4 formed by bending in a staggered manner has the number of folded sheets of the cathode foil 2 plus two sheets,
In other words, 4a and 4b are folded two more times,
With such a configuration, the cathode foil 3 and the electrolytic paper 4
When these are combined, it becomes easier to always align the cathode foil 3 at the same position so that it does not protrude beyond the electrolytic paper 4. Note that the lengths of 4a and 4b may be any length.

A flat aluminum electrolytic capacitor element 1 as shown in FIG. 4 is constructed by alternately overlapping these cathode foils 3, electrolytic paper, and a plurality of plate-shaped anode foils 2. At this time, the plurality of plate-shaped anode foils 2
The anode lead-out lead 6 is attached to the ears 2a, 2b, 2c provided at the edges of the anode by caulking.

Further, the aluminum electrolytic capacitor element 1 thus configured in a flat plate shape is placed in a bag-shaped sheet 7 as shown in FIG. 1(c), and this bag-shaped sheet 7 is
The safety valve 10 shown in FIG. 1(e) is inserted between a storage member 9 made of an elastic material such as rubber and provided with a storage chamber 8 in which the aluminum electrolytic capacitor element 1 shown in FIG. 1(b) is stored. is placed in the groove 9a provided in the storage member 9, and the anode lead 6 and the cathode lead 5 are inserted into the grooves 9b and 9c, respectively. Next, the storage member 9 constructed in this manner is inserted into a rectangular case 11 with one end open as shown in FIG. 1(a), and the plate 12 shown in FIG. The cathode lead 5 is placed on one end of the rectangular case 11 at the opening side so as to pass through the holes 13 and 14 of the plate 12, and the anode lead 6 and the cathode lead 5 are attached in FIGS. 1(f) and 1(g).
) Insert the rubber packings 15 and 16 shown in Fig. 2(a).
After that, a rectangular cap 17 shown in FIG. 2(b) is placed over the open end of the case 11 to seal it, thereby forming a flat aluminum electrolytic capacitor as shown in FIG. It is composed of

[0014]

[Effects of the Invention] As described above, the aluminum electrolytic capacitor of the present invention consists of a plurality of rectangular plate-shaped anode foils, a cathode foil formed by bending in a zigzag pattern, and an electrolytic paper formed by bending in a zigzag pattern. are combined to form a flat aluminum electrolytic capacitor element, so even if the anode foil is strongly etched, the anode foil will not crack unlike the case with windings, and the cathode foil and Since the electrolytic paper is folded in a staggered manner, insertion of the electrolytic paper and plate-shaped anode foil can be carried out smoothly.Moreover, the aluminum electrolytic capacitor element can be placed inside a bag-shaped sheet and This bag-shaped sheet is sandwiched between a storage member made of an elastic body and provided with a storage chamber in which the aluminum electrolytic capacitor element is stored, and this storage member is further inserted into a rectangular case with an open end. Since the aluminum electrolytic capacitor is constructed by sealing the open end of this case with a square cap, its productivity is extremely high and it can be obtained at a low cost. It is something.

[Brief explanation of the drawing]

[Fig. 1] (a) A perspective view of a case in an aluminum electrolytic capacitor showing an embodiment of the present invention. (b) A perspective view of a storage member in the aluminum electrolytic capacitor. (c) An element in the aluminum electrolytic capacitor is arranged in a bag-like sheet. (d) Perspective view of the plate in the same aluminum electrolytic capacitor (e) Perspective view of the safety valve in the same aluminum electrolytic capacitor (f) Side view of the rubber packing in the same aluminum electrolytic capacitor (g) Side view of the rubber packing in the same aluminum electrolytic capacitor Side view of rubber packing in electrolytic capacitor

[Figure 2] (a) A perspective view of the case of the aluminum electrolytic capacitor (b) A perspective view showing the square cap of the aluminum electrolytic capacitor

[Figure 3] A perspective view showing the completed state of the aluminum electrolytic capacitor

[Figure 4] A perspective view showing the elements of the aluminum electrolytic capacitor.

[
Figure 5: Exploded perspective view of the element in the same aluminum electrolytic capacitor

[Explanation of symbols] 1 Aluminum electrolytic capacitor element 2 Anode foil 2a, 2b, 2c ears 3 Cathode foil 4 Electrolytic paper 7 Bag-shaped sheet 8 Storage room 9 Storage components 11 Case

Claims (4)

[Claims] Claim 1: A flat aluminum electrolytic capacitor element is constructed by combining a plurality of rectangular plate-shaped anode foils, cathode foils formed by bending in a staggered manner, and electrolytic paper formed by bending in a staggered manner. The aluminum electrolytic capacitor element is placed in a bag-like sheet, and the bag-like sheet is sandwiched between storage members made of an elastic body provided with a storage chamber in which the aluminum electrolytic capacitor element is stored. An aluminum electrolytic capacitor characterized in that this storage member is inserted into a square case with one end open, and the open end of the case is covered with a square cap to seal it. [Claim 2] Each of the plurality of plate-shaped anode foils has an ear portion on its edge for connecting the lead to the lead, and these ears are located at positions when the plurality of plate-shaped anode foils are stacked. 2. The aluminum electrolytic capacitor according to claim 1, wherein the aluminum electrolytic capacitor is configured to be shifted. 3. The cathode foil formed by bending in a staggered manner is folded into twice the number of anode foils so as to sandwich a plurality of plate-shaped anode foils with electrolytic paper interposed therebetween. 2. The aluminum electrolytic capacitor according to claim 1, wherein the cathode foil covers both sides of the foil with electrolytic paper interposed therebetween. 4. The aluminum electrolytic capacitor according to claim 1, wherein the electrolytic paper formed by folding in a zigzag pattern is formed by folding two sheets more than the number of folds of the cathode foil.