JPH0785462B2 - Capacitor and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor and a method for manufacturing the same, and more particularly, to a capacitor having a stable performance capable of completely preventing a short circuit and a contact between the capacitor element and a housing case due to crushing of a wound capacitor element. The present invention also relates to a method of manufacturing a capacitor, which enables easy manufacturing of the capacitor.

[0002]

2. Description of the Related Art Conventionally, referring to FIGS. 5 and 6, for example, an electrolytic capacitor element 1 is an anode electrode in which an oxide film is formed on the surface of an aluminum foil having a purity of about 99.99% and a thickness of 60 to 100 μm. A tab for pole extraction (not shown) is fixed to the foil 2 and the cathode electrode foil 3 which is an aluminum foil having a thickness of 40 to 50 μm, and the anode electrode foil 2, the cathode electrode foil 3 and the electrolytic paper 4 are attached. It is made by alternately stacking and rolling up into a cylindrical shape.

However, the central portion 1a of the capacitor element 1 is
Since it is hollow, when an external force in the direction of arrow A is applied when the capacitor element 1 is impregnated with the electrolytic solution in the vacuum impregnation tank and during transportation, the capacitor element 1 is easily deformed and crushed. There was a possibility that the anode electrode foil 2 and the cathode electrode foil 3 in the central portion would come into contact with each other and short-circuit, and the capacitor element 1 would become a defective product.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to provide an electrode foil for an anode, an electrode foil for a cathode and an electrolytic paper. By alternately superposing them and winding them around a winding shaft, and leaving the winding shaft in the center as it is, and winding up in a cylindrical shape to manufacture a capacitor element, a short circuit due to the collapse of the capacitor element is completely prevented, and the capacitor element is The object is to make it possible to easily wind up into a stable and constant shape at all times, and to provide a capacitor having a stable quality with a very small variation and a high performance.

Still another object is to press the pyramidal drive shaft into the center hole of the hollow winding shaft to rotate the winding shaft to wind up the electrode foil for anode, the electrode foil for cathode and the electrolytic paper.
The purpose is to allow multiple edges of the drive shaft to bite into the center hole of the winding shaft for driving, and to rotate the winding shaft with a simple device without the need for a complicated driving device for the winding shaft to make the anode electrode. The purpose of the present invention is to make it possible to wind up the foil, the electrode foil for the cathode, and the electrolytic paper, thereby simplifying the structure of the winding device and reducing the cost.

Still another object is to fix a disk to one end of a hollow winding shaft and to alternately stack an electrode foil for an anode, an electrode foil for a cathode and electrolytic paper so that the diameter is smaller than the diameter of the disk. By accommodating the capacitor element manufactured by winding it in a storage case having an inner diameter slightly larger than the diameter of the disc, a constant gap is formed between the outer circumference of the capacitor element and the inner circumference of the storage case. Therefore, the capacitor elements can be stably arranged in the housing case without being biased, and a capacitor capable of maintaining stable performance for a long time without any interference with the inner wall is to be obtained.

[0007]

In summary, in the method of manufacturing a capacitor according to the present invention (claim 1), a pyramidal drive shaft having a plurality of edges is made of a material having a hardness smaller than that of the drive shaft. An electrode foil for an anode, which is pressed against a central hole of a hollow winding shaft to rotate the winding shaft and to which a tab for pole extraction is fixed.
It is characterized in that the electrode foil for cathode and the electrolytic paper are alternately laminated and wound around the winding shaft, and rolled up in a cylindrical shape to form a capacitor element.

A capacitor according to the present invention (claim 2)
Is an electrode foil for anodes, electrode foil for cathodes, and electrolytic paper with electrode tabs for electrode pulling attached alternately on a hollow winding shaft with a disk with a diameter slightly smaller than the inner diameter of the storage case fixed at one end. It is characterized by including a capacitor element which is superposed on and wound up so as to have a diameter smaller than the diameter of the disc.

A capacitor according to the present invention (claim 3)
Is a diameter smaller than the diameter of the disk by alternately stacking the electrode foil for the anode, the electrode foil for the cathode and the electrolytic paper to which the tab for pole extraction is fixed to the hollow winding shaft with the disk fixed at one end Rolled up, the rolled-up capacitor element is housed in a storage case having an inner diameter slightly larger than the diameter of the disc, and a constant gap is formed between the outer circumference of the capacitor element and the inner circumference of the storage case. It is characterized by being configured as described above.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. With reference to FIGS. 1 to 4, a capacitor 10 according to the present invention includes a capacitor element 11 and a storage case 12.

The capacitor element 11 is manufactured by alternately stacking the anode electrode foil 14, the cathode electrode foil 15 and the electrolytic paper 16 on the winding shaft 13 and winding the winding. The winding shaft 13 has a center hole 13a. Hollow aluminum pipe 13
The disk 13c is fixed to one end of b.

A drive shaft 18 made of a material having a hardness higher than that of the winding shaft 13, for example, iron, and having one end 18a formed in a quadrangular pyramid shape, which is an example of a pyramid, is provided with an arrow in the center hole 13a of the winding shaft 13. Press in the B direction and press the aluminum pipe 1
The corner portion 18b is bited into 3b to form, for example, concave portions 13d (FIG. 4) for transmitting the rotational driving force at four locations, and an arrow C
The electrode plate 14 for the anode, the electrode foil 15 for the cathode, and the electrolytic paper 16 are alternately superposed on the winding shaft 13 by rotating the disk 1
It is manufactured by winding it so that the diameter is smaller than the diameter of 3c.

A pole lead-out tab 19 to which a lead wire 19a is fixed is inserted through the anode electrode foil 14 and the cathode electrode foil 15 together with the anode electrode foil 14 and the cathode electrode foil 15 through a not-shown pin needle. The holes 19b are drilled to fix each other.

The accommodating case 12 is for accommodating the capacitor element 11 and is a cylindrical container made of aluminum having a bottom portion 12a, and its inner diameter is larger than the diameter of the disk 13c of the winding shaft 13. It is made slightly larger.

In the capacitor 10, by inserting the capacitor element 11 manufactured as described above into the housing case 12, a gap 21 is formed between the outer circumference 11a of the capacitor element 11 and the inner circumference 12c of the housing case 12. It is formed and stored, and the opening 12b is closed by the sealing rubber 20.

The method for manufacturing a capacitor according to the present invention (claim 1) is a hollow winding shaft made of a pyramidal drive shaft 18 having a plurality of edges 18b made of a material having a hardness lower than that of the drive shaft 18. The winding shaft 13 is rotated by pressing it against the center hole 13a of the winding 13, and the electrode foil 14 for the anode, the electrode foil 15 for the cathode, and the electrolytic paper 16 to which the tabs 19 for pole extraction are fixed are alternately superposed on the winding shaft 13. This is a method of manufacturing the capacitor 10 in which the capacitor element 11 is wound up and rolled up into a cylindrical shape.

The present invention is configured as described above,
The operation will be described below. 1 to 4, when the corner portion 18b of the drive shaft 18 is pressed into the aluminum pipe 13b in the direction of the arrow B so as to bite into it, four recessed portions 13d as shown in FIG. 4 are formed. A rotational force can be transmitted from the drive shaft 18 to the aluminum pipe 13b, and the drive shaft 18 is rotated in the direction of arrow C to make the anode electrode foil 14, the cathode electrode foil 15 and the electrolytic paper 1
Since the capacitors 6 are alternately stacked and wound up on the winding shaft 13 serving as a core to form the capacitor element 11, the capacitor element 11 is not crushed even if some force is applied from the outside of the capacitor element 11, and therefore the capacitor element 11 is used for the anode. The electrode foil 14 and the cathode electrode foil 15 do not come into contact with each other to cause a short circuit.

The electrode foil 14 for the anode and the electrode foil 15 for the cathode
Since the electrolytic paper 16 is wound up along the disk 13c, the electrolytic paper 16 can be wound in an orderly manner, the winding is not broken, and an element having stable electric characteristics can be manufactured.

The diameters of the rolled-up anode electrode foil 14, cathode electrode foil 15 and electrolytic paper 16 are smaller than the diameter of the disk 13c, and the diameter of the disk 13c is the storage case 12.
Since it is set to a size slightly smaller than the inner diameter of
The capacitor element 11 is a rolled-up anode electrode foil 1
4. The electrode foil 15 for cathode and the electrolytic paper 16 can be stably stored in the storage case 12 without breaking.

Since a gap 21 having a constant size is always formed between the outer circumference 11a of the capacitor element 11 and the inner circumference 12c of the storage case 12, a high-performance capacitor 10 having stable element electrical characteristics can be easily formed. Can be obtained.

[0021]

As described above, the present invention provides an electrode foil for an anode,
Since the electrode foil for the cathode and the electrolytic paper are alternately laminated and wound on the winding shaft, and the winding shaft is left in the center as it is to be rolled up in a cylindrical shape to produce a capacitor element, a short circuit due to the collapse of the capacitor element is made. The effect that the capacitor element can be easily wound into a stable and constant shape at the same time, and as a result there is very little variation and stable quality and a high-performance capacitor can be provided. There is.

Further, the pyramidal drive shaft is pressed into the central hole of the hollow winding shaft to rotate the winding shaft to wind up the anode electrode foil, the cathode electrode foil and the electrolytic paper. It can be driven simply by biting the edge of the coil into the center hole of the winding shaft, and the winding shaft can be rotated with a simple device without the need for a complicated driving device for the winding shaft. You can wind up the paper,
There is an effect that the structure of the winding device can be simplified and the cost can be reduced.

Further, a disk is fixed to one end of the hollow winding shaft, and the electrode foil for the anode, the electrode foil for the cathode and the electrolytic paper are alternately superposed and rolled up to have a diameter smaller than the diameter of the disk. The capacitor element manufactured according to the above method is housed in a storage case having an inner diameter slightly larger than the diameter of the disc, so that a constant gap is formed between the outer circumference of the capacitor element and the inner circumference of the storage case. There is an effect that the capacitor can be stably arranged in the storage case without being biased, and there is an effect that there is no interference with the inner wall and a capacitor that can maintain stable performance for a long period of time can be obtained.

[Brief description of drawings]

1 to 4 relate to an embodiment of the present invention, and FIG. 1 is a perspective view showing a state in which an electrode foil and an electrolytic paper are wound around a hollow winding shaft by a pyramidal drive shaft.

FIG. 2 is a perspective view of a hollow winding shaft.

FIG. 3 is a partially cutaway perspective view of a capacitor in which a capacitor element is housed in a housing case.

FIG. 4 is a plan view of a rolled-up capacitor element.

5 and 6 relate to a conventional example, and FIG. 5 is a plan view of a rolled-up capacitor element.

FIG. 6 is a plan view of the capacitor element showing a state in which the central portion is crushed by an external force.

[Explanation of symbols]

 10 capacitor 11 capacitor element 11a outer circumference of capacitor element 12 storage case 12c inner circumference of storage case 13 winding shaft 13a center hole 13c disk 14 electrode foil for anode 15 electrode foil for cathode 16 electrolytic paper 18 drive shaft 18b edge 19 for extraction of pole Tab 21 gap

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // H01G 13/02 C 9174-5E H01G 9/04 319

Claims (3)

[Claims] 1. A pole-shaped drive shaft having a plurality of edges is pressed against a center hole of a hollow winding shaft made of a material having a hardness smaller than that of the driving shaft to rotate the winding shaft, and the pole is pulled out. A method for manufacturing a capacitor, characterized in that an electrode foil for an anode, an electrode foil for a cathode, and electrolytic paper, to which tabs are fixed, are alternately superposed and wound around the winding shaft, and rolled up in a cylindrical shape to form a capacitor element. 2. An electrode foil for an anode, an electrode foil for a cathode, and an electrolysis device, wherein a pole for pulling out is fixed to a hollow winding shaft having one end fixed with a disk having a diameter slightly smaller than the inner diameter of a storage case. A capacitor comprising a capacitor element formed by alternately stacking paper sheets and winding them so as to have a diameter smaller than the diameter of the disk. 3. An electrode foil for an anode, an electrode foil for a cathode, and an electrolytic paper, each having a tab for pole extraction fixed to a hollow winding shaft having a disk fixed to one end, are alternately stacked to obtain a diameter of the disk. Is also wound into a small diameter, and the rolled-up capacitor element is housed in a storage case having an inner diameter slightly larger than the diameter of the disc, and a constant gap is provided between the outer circumference of the capacitor element and the inner circumference of the storage case. A capacitor, which is configured to be formed.