JP2910080B2 - Manufacturing method of electrode foil for aluminum electrolytic capacitor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrode foil for an aluminum electrolytic capacitor for improving the production capacity of the electrode foil for an aluminum electrolytic capacitor by increasing the supply amount of a formation current. .

2. Description of the Related Art In recent years, market demands for electrolytic capacitors have demanded cost reduction in addition to high reliability, lightness, and size reduction.

For cost reduction, it is strongly desired to provide an inexpensive electrode foil, which is a main material of an electrolytic capacitor.

Hereinafter, a method for manufacturing a conventional electrode foil for an aluminum electrolytic capacitor will be described.

FIG. 3 is a conceptual diagram of a manufacturing apparatus for explaining a conventional method of manufacturing an electrode foil for an aluminum electrolytic capacitor. In FIG. 3, reference numerals 1 and 4 denote a chemical tank, 5 denotes a feeding roller, 6 and 7 denote a DC power source, 8 denotes a conversion foil, and 9 denotes an aluminum foil.

The formation tanks 1, 4 have a plurality of formation electrodes connected to the cathodes of the DC power supplies 6, 7, and a formation solution. The power supply roller 5 is a DC power supply.
6, 7 anodes are connected and rotate so that power can be supplied continuously.

The operation of the apparatus for manufacturing an electrode foil for an aluminum electrolytic capacitor configured as described above will be described below.

First, a formation current is supplied to the aluminum foil 9 from the power supply roller 5, and a formation film corresponding to the voltage of the DC power supply 6 is formed in the formation tank 1. Next, in the chemical conversion tank 4, a chemical conversion film corresponding to the voltage of the DC power supply 7 is formed by a chemical conversion current supplied from the power supply roller 5. At this time, the voltage of the DC power supply 7 is set to be higher than the voltage of the DC power supply 6.

However, in the above-mentioned conventional method, the supply of the formation current can be provided at only one place at the stage of the aluminum foil 9, so that the formation current is increased in order to improve the productivity of the formation film. If this is done, a spark discharge occurs between the power supply roller 5 and the aluminum foil 9, and the aluminum foil 9 is melted and cannot be produced.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing an electrode foil for an aluminum electrolytic capacitor, which can reduce the cost by improving the productivity.

Means for Solving the Problems In order to solve this problem, the method for manufacturing an electrode foil for an aluminum electrolytic capacitor of the present invention includes, in addition to a conventional power supply roller for supplying power to an aluminum foil, a chemical conversion film formed with a chemical conversion film, The power supply is indirectly performed by using a liquid, and includes a power supply roller connected to an anode of a first DC power supply, a plurality of formation electrodes connected to a cathode of the first DC power supply, and a formation liquid. A first chemical conversion tank, a hydration treatment tank for performing a boiling treatment in an aqueous solution containing ammonium borate, sodium borate, or phosphoric acid as a component and / or a roller of φ30 or less for bending a chemical conversion foil; A power supply tank having a plurality of power supply electrodes connected to the anode of the second DC power supply and a power supply liquid; and a second chemical formation tank having a plurality of formation electrodes connected to the cathode of the second DC power supply and the formation liquid. And the first straight line is provided. Than the power supply voltage of the second DC power supply voltage is set high to the supply anodizing current from the feeding roller and the feed tank, in which a manufacturing method of performing chemical conversion by an aluminum foil is continuously running in this state.

Function This production method makes it possible to supply the formation current from a plurality of places, so that the current is dispersed throughout the formation foil, the current is not locally concentrated, and the aluminum is partially heated due to heat generation. It can prevent hydrogen embrittlement.

Further, in the case of indirectly supplying power to the chemical conversion foil in the power supply tank via the power supply solution, the chemical conversion foil is subjected to boiling treatment in an aqueous solution containing ammonium borate, sodium borate, or phosphoric acid as a component in the preceding step. Since the chemical conversion film is hydrated and ions that carry electricity are implanted into the chemical conversion film, the electrical resistance of the chemical conversion film can be reduced.

Similarly, a crack is generated in the chemical conversion film by applying a bending load to the chemical conversion foil in the previous process, and the electrolytic solution for power supply comes into direct contact with the internal metal (aluminum) through the crack, thereby reducing the electrical resistance of the chemical conversion film. be able to. By these effects, the bath voltage of the power supply tank is reduced, and the power loss at the time of power supply is extremely small, so that the supply amount of the formation current can be greatly increased, and the cost can be reduced by improving the production speed.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
It is a conceptual diagram of the manufacturing apparatus for demonstrating the manufacturing method of the electrode foil for aluminum electrolytic capacitors.

In FIG. 1, reference numerals 1 and 4 denote a chemical conversion tank and 2 denotes a hydration treatment tank. Reference numeral 3 denotes a power supply tank, and reference numeral 5 denotes a power supply roller. Reference numerals 6 and 7 denote DC power supplies, 8 denotes a conversion foil, and 9 denotes an aluminum foil.

The formation tanks 1 and 4 have a plurality of formation electrodes connected to a cathode of a DC power supply and a formation solution. The hydration treatment tank 2 has a high-temperature aqueous solution containing ammonium borate, sodium borate, or phosphoric acid as a component. The power supply tank 3 has a plurality of power supply electrodes to which an anode of a DC power supply is connected and a power supply liquid. The power supply roller 5 is connected to an anode of a DC power supply.

The operation of the apparatus for manufacturing an electrode foil for an aluminum electrolytic capacitor configured as described above will be described below.

First, a formation current is supplied to the aluminum foil 9 from the power supply roller 5, and a formation film corresponding to the voltage of the DC power supply 6 is formed in the formation tank 1. Next, the chemical conversion film is boiled in the hydration treatment tank 2, and ions that carry electricity are injected into the chemical conversion film. Next, a current is supplied to the chemical conversion foil 8 from the power supply electrode by the ion current in the power supply tank 3. Next, a chemical conversion film corresponding to the voltage of the DC power supply 7 is formed in the chemical conversion tank 4. At this time, the voltage of the DC power supply 7 is set higher than the voltage of the DC power supply 6. Next, conditions of the present embodiment will be described.

(1) Power supply tank 3 conditions Power supply composition: Ammonium adipate 50g / Electricity: 1A / 10cm ² × 4 minutes Power supply liquid temperature: 30 ° C (2) Voltage of DC power supply 6: 300V (3) DC power supply 7 (4) Conditions for hydration treatment tank 2 Ammonium borate: 0.01 g /, 0.1 g /, 1.0 g / Treatment liquid composition: sodium borate: 0.01 g /, 0.1 g /
, 1.0 g / phosphoric acid ... 0.1 g /, 1 g /, 10 g / Treatment temperature: 95 ° C Treatment time: 3 minutes The bath voltage of the power supply tank 3 and the bending strength of the conversion foil 8 when the above contents were carried out. It is shown in Table 1.

As described above, according to this example, after the formation of the chemical conversion film, ammonium borate 0.01 g / ~ 1 g / aqueous solution,
Alternatively, by providing a hydration treatment tank that performs boiling treatment in 0.01 g / -1 g / aqueous solution of sodium borate or 1 g / -10 g / aqueous solution of phosphoric acid, the bath voltage of the power supply tank 3 is reduced when the hydration treatment is not performed. Reduced to 1/6. This indicates that the power loss when supplying power using liquid is reduced to about 1/6 by the hydration treatment. Further, the hydration treatment can prevent the strength of the chemical conversion foil 8 from decreasing.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

FIGS. 2 (a) and 2 (b) are conceptual diagrams of an aluminum electrolytic capacitor electrode foil and a manufacturing apparatus according to a second embodiment of the present invention. In the figure, reference numeral 10 denotes a folding roller for forming foil 8;
As shown in FIG. 2 (b), it is constituted by arranging a plurality of rollers 10a in a ring shape. This embodiment differs from the first embodiment shown in FIG. 1 in that a folding roller 10 is provided instead of the hydration treatment tank 2.

The operation of the apparatus for manufacturing an electrode foil for an aluminum electrolytic capacitor configured as described above will be described below.

First, a formation current is supplied to the aluminum foil 9 from the power supply roller 5, and a formation film corresponding to the voltage of the DC power supply 6 is formed in the formation tank 1. Next, the forming roller 8 is
Is bent, and cracks occur in the chemical conversion film formed on the surface of the chemical conversion foil 8. Next, in the power supply tank 3, a current is supplied from the power supply electrode to the chemical conversion foil 8 by an ionic current. Next, a chemical conversion film corresponding to the voltage of the DC power supply 7 is formed in the chemical conversion tank 4. At this time, the voltage of the DC power supply 7 is set higher than the voltage of the DC power supply 6.

 Next, conditions of the present embodiment will be described.

Diameter of folding roller 10 Roller diameter: φ10, φ20, φ30 The conditions of the power supply tank 3 and the voltages of the DC power supplies 6 and 7 are the same as those in the first embodiment.

Table 2 shows the bath voltage of the power supply tank 3 and the bending strength of the chemical conversion foil 8 when the above operation was performed.

As described above, according to the present embodiment, the bath voltage of the power supply tank was reduced to about 1/3 by providing a roller of φ20 or less for bending the chemical conversion foil 8. This means that the power loss when supplying power using the liquid can be reduced to about 1/3 by providing the folding roller. Also, the strength of the chemical conversion foil 8 was able to be prevented from lowering.

It goes without saying that the hydration tank 2 of the first embodiment and the bending roller 10 of the second embodiment may be used in combination. Also, when installing equipment for manufacturing electrode foil for aluminum electrolytic capacitors in a limited space, the conversion film is relatively thin.
At 200 V or less, it is effective to provide the bending roller 10 in front of the power supply tank 3 and to provide the hydration treatment tank 2 in front of the power supply tank 3 when the chemical conversion film becomes thick (300 V or more).

Effect of the Invention As described above, the present invention provides a power supply roller connected to the anode of the first DC power supply, a plurality of formation electrodes connected to the cathode of the first DC power supply, and a formation tank having a formation liquid. A hydration tank for performing a boiling treatment in an aqueous solution containing ammonium acid, sodium borate, or phosphoric acid as a component and / or a roller for bending a chemical conversion foil, and a plurality of power supplies connected to an anode of a second DC power supply A power supply tank having an electrode and a power supply liquid; and a plurality of formation electrodes connected to the cathode of the second DC power supply and a formation tank having a formation liquid, wherein a second DC power supply is provided based on the voltage of the first DC power supply. To increase the production speed and reduce the cost by forming a high voltage to supply the formation current from the power supply roller and the power supply tank and continuously running the aluminum foil in this state to perform the formation. What can be It is.

[Brief description of the drawings]

FIG. 1 is a conceptual view of a manufacturing apparatus for explaining a method of manufacturing an electrode foil for an aluminum electrolytic capacitor in a first embodiment of the present invention, and FIGS. 2 (a) and (b) are second views of the present invention. FIG. 3 is a conceptual diagram of a manufacturing apparatus for explaining a method for manufacturing an electrode foil for an aluminum electrolytic capacitor in an embodiment, and FIG. 3 is a conceptual diagram of a manufacturing apparatus for explaining a conventional method for manufacturing an electrode foil for an aluminum electrolytic capacitor. . 1,4 ... Chemical tank, 2 ... Hydration tank, 3 ... Power supply tank, 5
…… Power supply roller, 6,7… DC power supply, 8… Formation foil, 9
…… Aluminum foil, 10 …… Bending roller.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Satoru Kitamura 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-company (56) References JP-A-59-215716 (JP, A) JP-A-61-37977 (JP, A) JP-A-62-134919 (JP, A) (58) Fields studied (Int. . ⁶ , DB name) H01G 9/04

Claims (1)

(57) [Claims] 1. A power supply roller connected to an anode of a first DC power supply, a first chemical conversion tank having a plurality of formation electrodes and a formation liquid connected to a cathode of the first DC power supply, and ammonium borate. A hydration treatment tank for performing a boiling treatment in an aqueous solution, a sodium borate aqueous solution, or a phosphoric acid aqueous solution and / or a roller having a diameter of 30 or less for bending a conversion foil, and a plurality of power supply electrodes connected to an anode of a second DC power supply A power supply tank provided with a power supply solution and a plurality of formation electrodes connected to a cathode of the second DC power supply and a second formation tank having a formation solution;
An aluminum electrolytic capacitor characterized in that the voltage of the second DC power supply is set higher than the voltage of the DC power supply to supply a formation current from the power supply roller and the power supply tank, and the aluminum foil is continuously run in this state to form the aluminum electrolytic capacitor. Of manufacturing electrode foil for use.