JPH0645202A - Capacitor and its manufacturing method - Google Patents

Abstract

PURPOSE:To obtain a capacitor having the high voltage resistance and excellent insulation capacitance, preventing completely from shorting between electrode foils for an anode and a cathode, and to manufacture the capacitor extremely effectively. CONSTITUTION:After a pole draw-out tab 11 is secured to electrode foils for an anode and a cathode, an insulation paper 15 is adhered to a tab part for drawing out a pole, or the instant that the tab for drawing out the pole is cold welded to the electrode fouls for the anode and the cathode, the insulation paper is cold welded so as to coat the tab for drawing out the pole, and the electrode foils for the anode and the cathode and an electrolytic paper 16 are alternately superposed thereon to wind in a cylindrical shape.

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 of manufacturing the same, and more particularly to a capacitor having a high withstand voltage and excellent insulation performance, and a method of manufacturing the capacitor which can manufacture the capacitor extremely efficiently.

[0002]

2. Description of the Related Art Conventionally, referring to FIGS. 7 and 8, for example, an electrolytic capacitor element 1 as an example of a capacitor has a purity of 9%.
About 9.99%, an electrode foil 2 for an anode having an oxide film formed on the surface of an aluminum foil having a thickness of 60 to 100 μm and an electrode foil 3 for a cathode, which is an aluminum foil having a thickness of 40 to 50 μm, are provided with a tab 4 for pole extraction. It is fixed, and the electrode foil 2 for the anode, the electrode foil 3 for the cathode and the electrolytic paper 5 are alternately superposed on each other, and the winding shaft 6 is provided.
Is rolled up in a cylindrical shape (in the direction of arrow A) to be manufactured.

Many of the defects of the capacitor element 1 (about 90
%) Is a short circuit between the electrode foil 2 for anode and the electrode foil 3 for cathode, and the largest cause thereof is that foreign matter is mixed between the electrode foil 2 for anode, the electrode foil 3 for cathode and the electrolytic paper 5 at the time of winding. In addition, the electrolytic paper 5 is damaged by forming a sharp convex portion on the fixing portion 4a of the electrode drawing tab 4 to the electrode foil, or as a result of breaking the electrolytic paper 5, the electrode foil 2 for anode and cathode This is due to the contact with the electrode foil 3.

Particularly, in recent years, a compact and high-voltage capacitor has been demanded, and this tendency has been strengthened due to the fact that the film becomes harder, and short-circuit prevention measures have become a more important problem.

As a solution to such a problem, for a large-sized one such as a lug type capacitor, a protective paper 8 is manually inserted into the fixing portion 4a of the pole pull-out tab 4 immediately before winding, scissors and electrolysis. A method of protecting the paper 5 to prevent scratches and tears is adopted.

However, in this method, since the electrolytic paper 5 is not fixed to the anode electrode foil 2 and the cathode electrode foil 3, the electrolytic paper 5 is sometimes slipped from the fixing portion 4a of the electrode pull-out tab 4 and protected. It had a drawback that it could not function as a paper.

For the above reason, it is necessary to insert the protective paper 8 immediately before winding up the electrolytic paper 5, but this work is quite difficult, and there is a drawback that the operator requires considerable skill.

Further, it is positioned between the electrode foil 2 for the anode, the electrode foil 3 for the cathode and the electrolytic paper 5 which are guided by the guide roller 9 and travel at a high speed so as to surely cover the fixing portion 4a of the tab 4 for pulling out the electrode. Since it is difficult to insert the protective paper 8 by means of this, there is no choice but to insert at a low winding speed, and it is difficult to improve production efficiency.

In particular, since it is extremely difficult to insert the protective paper 8 into a small lead terminal type capacitor, no current short-circuit preventing measures have been taken.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art. The purpose of the present invention is to make an electrode foil for an anode and an electrode foil for a cathode for electrode extraction. After fixing the tabs and pasting the insulating paper in advance so as to cover the tabs for pole extraction, the electrode foil for the anode, the electrode foil for the cathode and the electrolytic paper are alternately superposed and rolled up into a cylindrical shape to form a capacitor element. By making it, the insulating paper can be automatically and surely inserted into a predetermined position without being displaced from the electrode pull-out tab, and by this, between the anode electrode foil and the cathode electrode foil. The purpose is to obtain a capacitor that completely prevents the short circuit of, has a high withstand voltage, and has excellent insulation performance.

Another object of the present invention is to provide a small lead terminal type capacitor with the above-mentioned structure so that the insulating paper can be automatically attached to the electrode pull-out tab portion in advance at any optimum position before winding the electrode foil. Is to improve the reliability of the capacitor by enabling the insulation treatment and also to perform the insulation treatment on the pole lead-out tab portion at a high speed.

Still another object is to fix the electrode pull-out tab to the anode electrode foil and the cathode electrode foil by cold pressure welding or at the same time, or after the electrode pull-out tab is cold pressure-welded, the insulating paper is used for electrode pull-out. By cold-pressing the electrode foil so as to cover the tab, it is possible to simultaneously fix the pole-drawing tab and insulate the pole-drawing tab in one step. It is to be able to manufacture a capacitor very efficiently without lowering it.

[0013]

In summary, the method of manufacturing a capacitor according to the present invention (Claim 1) is such that the electrode drawing tabs are fixed to the anode electrode foil and the cathode electrode foil, respectively, and then the back surface is adhered or An insulating paper coated with an adhesive is adhered onto the electrode pull-out tab of the electrode lead-out tab fixing portion so as to cover the electrode lead-out tab, and the anode electrode foil, the cathode electrode foil and two sheets. It is characterized in that the electrolytic element and the electrolytic paper are alternately laminated and rolled up into a cylindrical shape to form a capacitor element.

The capacitor according to the present invention (claim 2) is characterized in that the electrode lead-out tab fixed portion of the anode electrode foil and the cathode electrode foil to which the electrode lead-out tab is fixed has an adhesive or adhesive agent on the back surface. A coated capacitor is attached so as to cover the tab for electrode extraction, and the electrode foil for the anode, the electrode foil for the cathode and two electrolytic papers are alternately superposed on each other and the capacitor element is rolled up into a cylindrical shape. It is characterized by that.

Further, in the method for manufacturing a capacitor according to the present invention (claim 3), the electrode lead-out tab is cold pressed and fixed to the electrode foil for anode and the electrode foil for cathode, or at the same time the electrode lead-out tab is cooled. After press-contacting, cold-pressable insulating paper is cold-pressed onto the anode electrode foil and the cathode electrode foil so as to cover the electrode drawing tabs, and the anode electrode foil, the cathode electrode foil and 2 It is characterized in that a sheet of electrolytic paper is alternately superposed and rolled up into a cylindrical shape to form a capacitor element.

A capacitor according to the present invention (claim 4)
Is a cylindrical shape in which the electrode paper for the anode and the electrode foil for the cathode whose insulating paper is cold-pressed onto the electrode foil so as to cover the cold-pressed electrode drawing tab are alternately laminated with two electrolytic papers. It is characterized in that it includes a rolled-up capacitor element.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 to 3, the first embodiment of the present invention is an example of manufacturing a lead terminal type capacitor element 10, in which an anode electrode foil 13 and a cathode which are guided by a guide roller 12 and travel. The electrode lead-out tab 11 is superposed on the electrode foil 14 for use, and a hole 11a is made by penetrating a not-shown hook needle to fix the electrode lead-out tab 11 and the electrode foil 13 for anode or the electrode foil 14 for cathode. It

Then, an insulating paper 15 having a back surface coated with an adhesive or an adhesive so as to cover the entire surface of the pole-drawing tab 11 is adhered to the pole-drawing tab 11 in the direction of arrow B to perform insulation treatment. The position of the insulating paper 15 does not shift even when the anode electrode foil 13 and the cathode electrode foil 14 are subsequently conveyed. Therefore, the attaching work is automatically performed at any position in the manufacturing process of the lead terminal type capacitor element 10. Can be done on a regular basis.

Anode foil 1 for anode having the insulating paper 15 adhered thereto
3 and the electrode foil 14 for the cathode are alternately superposed on the electrolytic paper 16, wound around the winding shaft 18 in the direction of arrow C, and wound up in a cylindrical shape to manufacture the lead terminal type capacitor element 10.

With reference to FIGS. 4 to 6, the second embodiment of the present invention is an example of manufacturing a lag type capacitor element 20, which is an anode electrode foil 13 which is guided by a guide roller 12 and runs. Further, the electrode pull-out tab 11 and the cold-pressable insulating paper 21 which is a sheet of polypropylene resin, for example, are superposedly arranged on the cathode electrode foil 14, and the anode electrode foil 13 and the anode electrode foil 13 are cold-pressed by a press-contacting device (not shown). The electrode lead-out tab 11 and the insulating paper 21 are pressed against the electrode foil 14 for the cathode in the direction of the arrow D to form the protrusions 11a or 11b, and the electrode 11 for the electrode lead-out and the insulating paper 21 are pressed at the same time to form the electrode for the anode. It can be fixed on the foil 13 and the electrode foil 14 for the cathode to perform an insulation treatment.

Here, the insulating paper 21 may be fixed by forming either one of the protrusions 11a or 11b.
1a is formed when the insulating paper 21 and the electrode lead-out tab 11 are simultaneously cold-pressed and fixed to the anode electrode foil 13 or the cathode electrode foil 14.

On the other hand, in the convex portion 11b, the insulating paper 21 may be cold-pressed only at the front ends of the anode electrode foil 13 and the cathode electrode foil 14 in the conveying direction, and the pole lead-out tab 11 may be attached to the anode electrode. After forming the convex portion 11a on the foil 13 or the electrode foil 14 for the cathode and performing cold pressure welding, the insulating paper 21 is attached to the electrode foil 13 for the anode.
Alternatively, the convex portion 11b is formed by cold pressure contact with the cathode electrode foil 14 and the insulating paper 21 is applied to the anode electrode foil 13 or the cathode electrode foil 1.
It may be fixed to No. 4.

The electrode foil 13 for anode and the electrode foil 14 for cathode, to which the insulating paper 21 is cold-pressed, are alternately superposed on the electrolytic paper 16 and wound in the direction of arrow E by the winding shaft 18 to be rolled up into a cylindrical shape. Then, the lag type capacitor element 20 is manufactured.

The method for manufacturing a capacitor according to the present invention (claim 1) is the electrode foil 13 for anode and the electrode foil 1 for cathode.
After fixing the pole pull-out tabs 11 to the respective poles 4, the insulating paper 15 having the back surface coated with adhesive or adhesive is placed on the pole pull-out tabs 11 of the pole pull-out tab fixing portion.
The electrode element foil 13 for the anode, the electrode foil 14 for the cathode, and the two electrolytic papers 16 are alternately superposed on each other and rolled up into a cylindrical shape to form the capacitor element 10.

In the method for manufacturing a capacitor according to the present invention (claim 3), the electrode lead-out tab 11 is used for the anode electrode foil 1.
3 and the electrode foil 14 for cathode are fixed by cold pressure welding or at the same time as the tab 11 for pole drawing is cold pressed, and the insulating paper 21 which can be cold pressed is used for the anode so as to cover the tab 11 for electrode drawing. Cold pressure welding to the electrode foil 13 and the electrode foil 14 for cathode,
This is a method in which the anode electrode foil 13, the cathode electrode foil 14 and the two electrolytic papers 16 are alternately stacked and rolled up into a cylindrical shape to form the capacitor element 20.

The present invention is configured as described above,
The operation will be described below. 1 to 6, the electrode pull-out tab 11 fixed to the anode electrode foil 13 or the cathode electrode foil 14 has an insulating paper 15 or 2 over the entire surface.
Since it is covered with 1, even if the tab 11 for pole lead-out has some protrusions, it is protected by the insulating papers 15 and 21 and does not damage the electrolytic paper 16, and therefore even if a high voltage is applied to the capacitor. The insulation is not destroyed.

Further, since the insulating papers 15 and 21 can be carried out at a stage considerably before winding up, they can be automatically inserted into the pole pull-out tab 11 by the machine and fixed, so that it is much more accurate than manual work. In addition, it can be fixed at a desired position, and there is no risk of insulation failure due to displacement of the insulating papers 15 and 21.

Further, the insertion and fixing of the insulating papers 15 and 21 does not require the skill of an operator, and the efficiency of capacitor production can be improved significantly.

[0029]

As described above, according to the present invention, the electrode lead-out tab is fixed to the electrode foil for the anode and the electrode foil for the cathode as described above, and the insulating paper is attached in advance so as to cover the tab for the electrode lead-out. The electrode foil for cathode, the electrode foil for cathode and the electrolytic paper are alternately laminated and rolled up into a cylindrical shape to produce a capacitor element, so the insulating paper does not shift from the tab for pole extraction automatically and reliably. The effect of being able to insert in a predetermined position, and as a result, a short circuit between the electrode foil for the anode and the electrode foil for the cathode can be completely prevented, and a capacitor with high withstand voltage and excellent insulation performance can be obtained. There is.

In addition, with the above-described structure, the insulating paper can be automatically attached to the electrode lead-out tab portion in advance at any optimum position prior to the winding of the electrode foil, so that a small lead terminal type capacitor can be insulated. Therefore, the reliability of the capacitor can be improved, and the tab portion for pole lead-out can be insulated at high speed.

Further, at the same time as fixing the electrode pull-out tab to the electrode foil for anode and the electrode foil for cathode by cold pressing or at the same time after cold pressing the electrode tab for electrode pulling, insulating paper covers the tab for electrode pulling. Since the electrode foil is cold-pressed as described above, there is an effect that the pole lead-out tab can be fixed and the pole lead-out tab can be insulated at the same time in one step, and as a result, the winding speed is reduced. It is possible to obtain the effect that the capacitor can be manufactured extremely efficiently without performing the above.

[Brief description of drawings]

FIG. 1 to FIG. 3 relate to a first embodiment of the present invention, and FIG. 1 is a front view showing a state in which insulating paper is attached to a tab portion for pole drawing and a state in which electrode foil and electrolytic paper are rolled up. It is a figure.

FIG. 2 is a perspective view showing a state in which an electrode foil with an insulating paper and an electrolytic paper are wound up.

FIG. 3 is a perspective view showing a state in which insulating paper is attached to a tab portion for pole withdrawal.

FIG. 4 to FIG. 6 relate to a second embodiment of the present invention, and FIG. 4 is a front view showing a state in which insulating paper is attached to a tab portion for pole extraction and a state in which electrode foil and electrolytic paper are rolled up. It is a figure.

FIG. 5 is a perspective view showing a state in which the electrode foil and the electrolytic paper are rolled up.

FIG. 6 is a perspective view showing a state in which the insulating paper is cold pressed against the electrode foil.

7 and 8 relate to a conventional example, and FIG. 7 is a front view showing a state in which insulating paper is inserted in a tab portion for pole withdrawal and a state in which electrode foil and electrolytic paper are rolled up immediately before winding. is there.

FIG. 8 is a perspective view showing a state in which an insulating paper is inserted and an electrode foil and an electrolytic paper are rolled up.

[Explanation of symbols]

10 Lead Terminal Type Capacitor Element as an Example of Capacitor Element 11 Electrode Lead Tab 13 Anode Electrode Foil 14 Cathode Electrode Foil 15 Insulating Paper 16 Electrolytic Paper 20 Lag Type Capacitor Element as an Example of Capacitor Element 21 Insulating Paper

Claims (4)

[Claims] 1. A pole lead-out tab is fixed to each of the anode electrode foil and the cathode electrode foil, and an insulating paper coated with an adhesive or an adhesive is applied to the back side of the pole lead-out tab fixing portion for pole pull-out. It is attached to the tab so as to cover the electrode drawing tab, and the electrode foil for the anode, the electrode foil for the cathode, and two sheets of electrolytic paper are alternately superposed and rolled up into a cylindrical shape to form a capacitor element. Characteristic capacitor manufacturing method. 2. An insulating paper having a back surface coated with an adhesive or an adhesive is attached to the electrode drawing tab fixing portion of the anode electrode foil and the cathode electrode foil to which the electrode drawing tab is fixed, A capacitor comprising a capacitor element which is adhered so as to cover the electrode foil, the electrode foil for an anode, the electrode foil for a cathode and two sheets of electrolytic paper are alternately stacked and rolled up into a cylindrical shape. 3. An insulating paper which can be cold-welded at the same time as fixing the electrode lead-out tab to the electrode foil for anode and the electrode foil for cathode by cold pressure welding or after cold-welding the electrode lead-out tab. Cold press contact with the electrode foil for anode and the electrode foil for cathode so as to cover the tab for electrode drawing, and the electrode foil for anode, electrode foil for cathode and two sheets of electrolytic paper are alternately laminated to form a cylindrical shape. A method of manufacturing a capacitor, which comprises rolling up to form a capacitor element. 4. An electrode foil for an anode and an electrode foil for a cathode, in which an insulating paper is cold-welded to an electrode foil so as to cover a cold-pressed electrode drawing tab, are alternately laminated with two sheets of electrolytic paper. A capacitor including a capacitor element wound in a cylindrical shape.