JPH09139325A - Device and method for manufacturing electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a gas and breakdown from being generated in a resin case of an aluminum electrolytic capacitor when aging it in case of its manufacture by using the resin case. SOLUTION: An electrolytic capacitor part, which includes a PPS (polyphenylene sulfide) resin case 15 having an opening 15A used both for injecting an electrolyte into it and for degasing it and having a capacitor main body 7 integrated into it and so formed as for the lead terminals of the body 7 to be sealed in an airtight way in it by a resin, is attached to a movable capacitor holding member 26 present in a vacuum pressure impregnation vessel 21 and used jointly as a positive side power supply voltage feeding path. Then, after at least the opening 15A is dipped into an electrolyte 36 in the vacuum pressure impregnation vessel 21 for the electrolyte 36 to be vacuum-impregnated into the resin case 15, in the intact state, using the anode foil of the capacitor main body 7 as a positive electrode side and the electrolyte 36 as a negative electrode side, an aging current for forming an oxide film on the anode foil is made to flow through the oxide film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to prevent an accident that may cause destruction due to an increase in internal pressure of a case due to a gas generated during a process of manufacturing an aluminum electrolytic capacitor, particularly during an aging process. The present invention relates to a method for manufacturing an electrolytic capacitor and an apparatus for manufacturing the same.

In general, when an aluminum electrolytic capacitor is manufactured, an oxide film formed on an aluminum anode foil may be lost, so that it is repaired in an aging process.

However, since the gas generated during aging may cause an accident, the problem must be solved. According to the present invention, however,
One means of dealing with it is provided.

[0004]

2. Description of the Related Art FIG. 3 and FIG. 4 are perspective views of principal parts showing capacitor members in process steps for explaining a method of manufacturing a standard electrolytic capacitor. I will explain while doing it.

3 (A) 3- (1) For example, a lead wire 1A made of a wire material of iron (Fe) or copper (Cu) and a mounting portion 1B made of aluminum (Al) which is flattened by pressing an end portion. Are joined together by welding to form the lead terminal 1.

See FIG. 3B. 3- (2) By applying a wet etching method using an etchant as a mixed solution of hydrochloric acid or sulfuric acid, nitric acid, acetic acid or the like, the anode foil 2 made of aluminum is used. The surface is roughened by etching.

3- (3) By applying the anodic oxidation method, the anode foil 2 is dipped in an electrolytic solution to form the surface thereof to form an oxide film.

3- (4) The lead terminal 1 is fixed to the anode foil 2 by applying an ultrasonic welding method or a caulking method.

3 (C) and 3 (D) 3- (5) In the same manner as the anode foil 2, the cathode foil 3 made of aluminum is used.
The lead terminal 1 is fixed to.

3- (6) The anode foil 2, the separator 4 made of insulating paper, the cathode foil 3, and the separator 5 made of insulating paper are piled up, and the whole is rolled into a columnar shape, and the ends are fastened with a fastening tape 6. To form the capacitor body 7.

3- (7) The capacitor main body 7 is set in a vacuum impregnating device, and the air inside the capacitor main body 7 is eliminated by depressurizing the inside of the device, and then the driving electrolytic solution is injected. The injection at that time is performed so that the electrolytic solution enters the pores generated by roughening the anode foil 2.

4 (A) and 4 (B) 4- (1) A sealing body 8 made of rubber is press-fitted into the lead wire 1A led out from the capacitor body 7, and then an aluminum case 9 is covered. A winding tightening portion 10 called curling is formed at a contact portion between the sealing body 8 and the aluminum case 9 for sealing.

Refer to FIG. 4C. 4- (2) An exterior is provided as required. In the case of exterior packaging, it is performed by covering with a heat shrinkable tube 11 on which a manufacturer name, model number, rating, lot number, polarity, etc. are printed.

4- (3) A voltage higher by about 10% than the rated voltage and a temperature at the upper limit of the operating temperature, for example, about 80 [° C], and heated to 30
Aging is performed in the range of [minute] to 120 [minute]. This is because the self-repairing action of the electrolytic capacitor is utilized to repair defects mainly relating to the oxide film in the anode foil 2 that occur during processing.

The aging conditions differ depending on the manufacturing conditions of the electrolytic capacitor, and each manufacturer sets various conditions considered appropriate.

The reason why the aging is performed after the capacitor body 7 is sealed in the aluminum case 9 is that when the aging is performed in a non-sealed state, the electrolytic solution adheres to the aging device or the electrolytic solution is exposed to the atmosphere. This is because the composition changes due to evaporation or moisture in the air taken into the electrolytic solution.

4- (4) Inspect according to product specifications to eliminate defective products.

The life of the electrolytic capacitor manufactured as described above is at most 1000 [hours] to 2000 [hours], and the main reason for such a short life is that the electrolyte is a rubber sealant. It is in the loss through 8.

In recent years, in electronic equipment, surface mounting has been popular in which electronic parts are attached to a printed circuit board and reflow soldering is performed. In such a process, the electronic parts are 200 [200 seconds] although it takes about 10 seconds. Since it is exposed to a high temperature of [° C.] to 240 [° C.], in the electrolytic capacitor, an accident is likely to occur in which the electrolytic solution leaks from the sealing portion between the rubber sealing body 8 and the lead terminal 1.

Therefore, the present inventor previously provided an electrolytic capacitor having a structure in which the electrolytic solution is not dissipated (see Japanese Patent Application No. 7-135116, if necessary).

FIG. 5 is a perspective view of a main portion showing various capacitor members at a process step for explaining a method for manufacturing an improved electrolytic capacitor, which will be described below with reference to the drawings. Note that the same symbols as those used in FIGS. 3 and 4 represent the same parts or have the same meanings.

5 (A) 5- (1) The capacitor body 7 is manufactured through the same steps as those described with reference to FIG.

5- (2) Polyphenylene sulfide (polyphenyle)
nebulide (PPS) resin for inserting the lead terminal 1 led out from the capacitor main body 7 into the hole of the adhesive blocking body 14 and then for injecting and degassing the electrolyte solution surrounded by the collar portion 15B on the top surface. A case 15 also made of PPS resin, in which the opening 15A is formed, is covered.
In addition to the PPS resin, a polyethylene terephthalate resin such as Mylar (trade name) or a fluororesin such as Teflon (trade name Du Pont Co., USA) can be used as the material of the adhesive blocker 14.

5 (B) 5- (3) An adhesive 16 such as an epoxy resin is adhered to the adhesive blocking body 14 side of the case 15, and the temperature is set to 160 [° C.] for 30 minutes. ] The adhesive 16 is hardened by performing the heat treatment, and the lead terminal 1 is hermetically sealed. FIG. 5B
Then, a part of the case 15 is cut away and the inside is seen through.

5- (4) The whole is set in a vacuum impregnation device, and the air inside the case 15 is removed from the opening 15A by depressurizing the inside of the device.
Similarly, the electrolytic solution is injected through the opening 15A, and
Excessive electrolyte solution is removed from the case 15.

5 (C) 5- (5) Since the collar portion 15B is formed around the opening 15A in the case 15, the collar portion 15B is formed.
The heating iron is crushed by abutting and pressing the iron to close and seal the opening 15A.

5 (D). 5- (6) The case 15 is marked with the manufacturer's name, model number, rating, lot number, polarity, etc., and the lead terminal 1 is formed into a shape suitable for surface mounting. Since then
Perform aging and inspection.

As described above, in the electrolytic capacitor using the case 15 made of PPS resin, the impregnated electrolytic solution does not dissipate, so that the electrolytic solution can be retained for a long period of time.

[0029]

Generally, in the aluminum electrolytic capacitor, as described above, the anode foil 2 is used.
An oxide film capable of withstanding an applied voltage is formed on the surface of the capacitor by a chemical conversion treatment, but a missing portion is generated until the capacitor body is formed by being rolled up with other members.

The main places where this missing portion occurs are in the cut surface of the anode foil 2, the surface where the lead terminal 1 contacts the electrolytic solution, and the portion where the anode foil 2 and the lead terminal 1 are joined by caulking, for example. To do.

When the oxide film in the anode foil 2 has a missing portion, when aging is performed, the anode foil 2 is in direct contact with the electrolytic solution through the missing portion, so that a current flows through that portion. It will be.

That is, oxygen ions in the electrolytic solution flow into the anode foil 2 and hydrogen ions flow into the cathode foil 3, the oxygen ions lose electrons in the anode foil 2 to become oxygen, and the oxygen oxidizes and oxidizes aluminum. The defect is repaired as it creates a film.

By the way, in the cathode foil 3, hydrogen ions acquire electrons and become hydrogen, and a part of it dissolves in the electrolytic solution, but most of it expands as hydrogen, and the hydrogen is oxidized at the lacking part. It will be fully repaired at the membrane and will continue to occur until the current stops flowing, exerting pressure on the container.

In this case, the conventional electrolytic capacitor described with reference to FIGS. 3 and 4 causes almost no problem. The reason is that the rubber, which is the constituent material of the sealing body 8, permeates hydrogen, so that the pressure in the aluminum case 9 decreases with time.

However, the improved electrolytic capacitor manufactured by the method described with reference to FIGS. 3 and 5 poses a serious problem. That is, the amount of gas released from the case 15 is
Compared with the electrolytic capacitors described with reference to FIGS. 3 and 4, it is about 1/100 or less. Therefore, if the generation of gas in the case 15 is not suppressed, the internal pressure rises and an accident that causes destruction occurs.

In order to reduce the amount of hydrogen generated in such a case as much as possible, the lead terminal 1 attached to the anode foil 2 is used after being subjected to a chemical conversion treatment for forming an oxide film in advance, or a hydrogen absorbent is added to the electrolytic solution. Although measures such as doing so have been attempted, none of them have been a fundamental solution.

According to the present invention, no gas is generated in the resin case even after aging by making a simple modification to the process of manufacturing an aluminum electrolytic capacitor in which the capacitor body is sealed in the resin case. , So that no destruction will occur.

[0038]

According to the present invention, the cathode foil of the electrolytic capacitor is used as the cathode required to flow the current by forming a pair with the anode foil whose oxide film is to be repaired during aging. Instead, a cathode is separately provided in the electrolytic solution for vacuum impregnation, and hydrogen is not generated in the cathode foil in the resin case.

Generally, the aging current largely flows in the initial stage of aging and decreases as the formation of the oxide film progresses, and in actual measurement, it becomes about 1/50 2 [minutes] after energization.

Since the amount of hydrogen generated during aging is proportional to the electric current, if the hydrogen generated is removed by performing initial aging simultaneously with vacuum impregnation, the resin case in the electrolytic capacitor is completely sealed. Then, even when the final finishing aging is further performed for a long time, the amount of hydrogen generated is extremely small, and there is no possibility of exerting a pressure that causes the resin case to be destroyed.

From the above, in the method and apparatus for manufacturing the electrolytic capacitor according to the present invention,

(1) An opening for injecting an electrolytic solution (for example, an opening 15A for injecting an electrolytic solution and degassing) is provided and a capacitor main body (for example, capacitor main body 7) is built in, and a lead terminal (for example, lead terminal 1) is made of resin. A vacuum impregnation tank (for example, the vacuum impregnation tank 2) is provided with an electrolytic capacitor component including a hermetically sealed resin case (for example, a case 15 made of PPS resin).
1) Attaching to a capacitor support member (for example, a capacitor movable support member 26 also serving as a positive power supply voltage supply passage) that also serves as a positive power supply voltage supply passage in the inside, and at least the opening for injecting the electrolytic solution is the vacuum. A step of immersing the resin case in vacuum by impregnating it in an electrolytic solution (for example, electrolytic solution 36) in an impregnation tank, and setting the anode foil (for example, anode foil 2) of the capacitor body on the positive electrode side and Or a step of passing an aging current for forming an oxide film on the negative electrode side, or

(2) In (1) above, ultrasonic vibration is applied to the electrolytic solution in the vacuum impregnation tank in order to transmit ultrasonic vibration to the anode foil of the capacitor body, or

(3) In the above (1), a step of performing vacuum impregnation again after completion of aging is added, or

(4) Vacuum impregnation tank (for example, vacuum impregnation tank 2
1) Capacitor supporting member projecting inward and also serving as a positive-side power supply voltage supply path (for example, capacitor movable supporting member 26 also serving as a positive-side power supply voltage supply path) and an electrolytic solution (for example, electrolytic solution 36) in the vacuum impregnation tank. Or an electrode (for example, a cathode 27) that acts as a cathode with the electrolytic solution on the negative electrode side, or

(5) The above (4) is characterized in that an ultrasonic vibration device (for example, an ultrasonic vibration device 29) for transmitting ultrasonic vibration to the electrolytic solution is provided.

By adopting the above means, of course, during the aging of the electrolytic capacitor, hydrogen is generated at the cathode, but the cathode is not the cathode foil of the capacitor body but the outside of the resin case of the electrolytic capacitor. Since it is installed, all the hydrogen generated there will be dissipated to the outside, so there will be no accident that the internal pressure of the resin case rises and it will be destroyed. Therefore, it is possible to easily realize an electrolytic capacitor which does not disperse the electrolytic solution, has a long life, and is highly safe.

[0048]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are side sectional explanatory views showing a main part of an electrolytic capacitor manufacturing apparatus used for carrying out the present invention, which will be described below with reference to these drawings. The same symbols as those used in FIGS. 3 and 5 represent the same parts or have the same meanings.

In each drawing, 21 is a vacuum impregnation tank, 22 is an electrolytic solution inlet pipe, 23 is a valve, 24 is an exhaust pipe, 25 is a switching valve, and 26 is a movable capacitor that also serves as a positive power supply voltage supply path. Support member, 27 is a cathode, 28 is a DC power source, 2
9 is an ultrasonic vibration device, 30 is a vibrator, 31 is a liquid temperature control unit, 32 is an electrolytic solution tank, 33 is a vacuum pump, 34
Is an exhaust pipe, 35 is an outside air supply pipe, 36 is an electrolytic solution, 37 is an electrolytic capacitor in the process of completion, 37A is an anode side lead terminal, 37B is a cathode side lead terminal, and 38 is a hydrogen bubble.

The illustrated electrolytic capacitor manufacturing apparatus can be considered as a vacuum impregnating apparatus, and FIG.
2 is operated to prevent the electrolytic capacitor 37 from touching the electrolytic solution 36 (before impregnation with the electrolytic solution).
Indicates the state of being touched (during impregnation with the electrolytic solution).

FIG. 1 shows a case where the electrolytic capacitor 37 in the process of completion is vacuum-impregnated with an electrolytic solution using the apparatus shown in FIG.
A description will be given with reference to FIG.

1- (1) The valve 23 in the illustrated apparatus is opened to transfer a required amount of the electrolytic solution 36 from the electrolytic solution tank 32 into the vacuum impregnation tank 21,
When the liquid surface of the electrolytic solution 36 is maintained at a predetermined height, the valve 23
Is closed.

In this case, if the vacuum impregnation work is continuously performed, the electrolytic solution tank 32 is moved to the vacuum impregnation tank 2.
The amount of the electrolytic solution 36 to be transferred into the No. 1 is such that the consumption of the electrolytic solution 36 in the previous vacuum impregnation work is compensated.

1- (2) The liquid temperature control unit 31 is operated to maintain the liquid temperature of the electrolytic solution 36 at an appropriate level.

In the present invention, it is not necessary to specify the temperature of the electrolytic solution 36, but the vacuum impregnation and aging treatments are deeply related to the temperature of the electrolytic solution 36, and are suitable for the type of the electrolytic solution 36. It is better to control the temperature.

1- (3) The electrolytic capacitor 37 is set in the vacuum impregnation tank 21. In this case, the opening 15A of the case 15 is in the vacuum impregnation tank 2.
The anode side lead terminal 3 is attached to the capacitor movable support member 26 which is positioned so as to face the bottom of the electrolytic capacitor 37 and is positioned so that the electrolytic capacitor 37 is separated from the surface of the electrolytic solution 36.
7A is connected.

1- (4) The switching valve 25 is switched to communicate with the vacuum pump 33, and the vacuum pump 33 is operated to evacuate the vacuum impregnation tank 21.

At this time, the inside of the case 15 of the electrolytic capacitor 37 is also evacuated through the opening 15A to be in a vacuum state.

See FIG. 2 2- (1) After sufficient exhaustion, the condenser movable support member 26
Is operated so that at least the opening 15A of the case 15 in the electrolytic capacitor 37 is immersed in the electrolytic solution 36.

2- (2) When the switching valve 25 is operated to communicate with the outside air supply pipe 35 and the inside of the vacuum impregnation tank 21 is brought to the atmospheric pressure state, the electrolytic solution 3
6 enters the case 15 through the opening 15A and is filled there.

2- (3) Aging is performed by applying a (+) voltage from the DC power source 28 to the anode side lead terminal 37A of the electrolytic capacitor 37 and a (-) voltage to the cathode 27 in the electrolytic solution 36. I do.

The aging performed here is usually called primary aging. While the primary aging is performed, the ultrasonic vibration device 29 is driven to apply ultrasonic vibration to the electrolytic solution 36.

When the oxide film formed on the anode foil of the electrolytic capacitor 37 has a missing portion, a current flows through the path of the anode → the missing portion → the electrolytic solution 36 → the cathode 27, and the missing portion is caused by electrolysis. Oxygen is generated, the missing portion is oxidized, an oxide film is generated, and repair is performed.

In this case, since the case 15 is filled with the electrolytic solution 36, the entire aluminum surface on the anode side including the root portion of the anode lead terminal 37A can be subjected to chemical conversion treatment and covered with an oxide film.

As described above, the effect obtained by covering the anode side lead terminal 37A with the oxide film during the aging is surprisingly large.

That is, regardless of the present invention or the conventional technique, it is necessary to keep the electrolytic solution sealed in the case to the minimum necessary after the capacitor body is vacuum-impregnated with the electrolytic solution. Therefore, the capacitors other than those impregnated in the capacitor body are discharged and then sealed.

Therefore, in the case, there is a space other than the area occupied by the capacitor body, and the root of the lead terminal may or may not get wet with the electrolytic solution.
For that reason, in the aging according to the conventional technique, the chemical conversion treatment in the above-mentioned part is often insufficient, and the chemical conversion treatment is not sufficient due to the movement of the electrolytic solution due to vibration or the like. When the electrolytic solution adheres to a sufficient portion, the leakage current increases and problems such as defective characteristics occur. However, such a problem does not occur according to the present invention.

At the cathode 27 in the electrolytic solution 36, hydrogen is also generated by electrolysis as indicated by bubbles 38, and the hydrogen is generated in the electrolytic capacitor 37. Since it is generated outside the case 15 and is discharged into the vacuum impregnation tank 21, there is no problem such as an increase in the internal pressure of the case 15.

During the primary aging, ultrasonic vibration is applied to the electrolytic solution 36 by the ultrasonic vibration device 29, and the ultrasonic vibration reaches the surface of the anode foil. Since it has the effect of vibrating and moving the micro bubbles adhering to the surface of the anode foil, the missing parts are exposed in the electrolytic solution without being covered by the micro bubbles, and the oxide film can be repaired uniformly and densely. Done.

During aging, the electrolytic capacitor 37
Since the capacitor body 7 of is soaked in the electrolytic solution 36,
Even when not only one electrolytic capacitor 37 but also a large number of electrolytic capacitors 37 are batch-processed, ultrasonic vibration of the ultrasonic vibration device 39 causes all electrolytic capacitors 37 to pass through the electrolytic solution 36.
Can be propagated to

The electrolytic capacitor 37, which has been vacuum-impregnated with the electrolytic solution 36 through the above-described steps, is taken out of the vacuum impregnation tank 21, and the liquid of the case 15 is removed in the same manner as the conventional technique described with reference to FIGS. 3 and 5. Densely sealed to complete.

During the primary aging, ultrasonic vibration may cause bubbles to be generated in the case 15. In that case, by repeating the above steps, the bubbles are generated in the case 15. It is released to the outside, and better characteristics can be obtained.

According to the experiment, the completed electrolytic capacitor 37 has a temperature of 10% since the electrolyte solution is not scattered.
10,000 [hours] in a high temperature atmosphere of 5 [° C]
It is possible to maintain the service life of more than 80%, and even if the sealing is performed with high liquid tightness, the hydrogen gas pressure in the case 15 rises and the accident such as destruction occurs. Did not occur.

The present invention is not limited to the above embodiment, and many other modifications can be realized.

For example, in the apparatus described with reference to FIGS. 1 and 2, the condenser movable indicator member 26 is operated to keep the electrolytic condenser 37 separated from the liquid surface of the electrolytic solution 36, or Although it is immersed in the liquid 36, this has the same effect even if the electrolytic capacitor 37 is fixedly set and the liquid surface of the electrolytic solution 36 is raised and lowered.

To raise or lower the liquid level of the electrolytic solution 36, the valve 23 is opened and the electrolytic solution tank 3 is operated when the operation is performed.
Although it is easy to pressurize or depressurize the electrolytic solution 36 in 2, it is possible to employ various means such as adjusting the degree of vacuum in the vacuum impregnation tank 21 with the valve 23 opened.

Although only one electrolytic capacitor 37 is shown and described in FIGS. 1 and 2, a large number of electrolytic capacitors 37 are arranged and the respective anode foils are arranged in parallel to serve as the positive power supply voltage supply path. By connecting to the condenser movable support member 26, it is possible to perform batch processing at the same time.

When performing such batch processing, according to the conventional technique, each anode foil is connected in parallel to the positive power supply voltage supply path and the cathode foil is also connected in parallel to the negative power supply voltage supply path. Therefore, if a short circuit occurs in one electrolytic capacitor, the terminal voltage in all electrolytic capacitors becomes zero, and aging cannot be performed.

However, in the case of the present invention, during aging, the cathode foil of the normal electrolytic capacitor is in a floating state, and only the electrolytic capacitor which has a short circuit is applied with a positive voltage through the anode foil also to the cathode foil. As a result, an oxide film is generated, and thus the electrolytic capacitor that caused the short circuit becomes a defective product, but other electrolytic capacitors can perform aging without any trouble.

Further, when performing the series of operations, it is not necessary to apply or cut off the aging voltage, and the aging voltage should always be applied after the target electrolytic capacitor is set in the device. You can

By doing so, vacuum impregnation begins,
Aging starts from the part where the electrolytic solution is in contact with the anode foil of the electrolytic capacitor, and the aging area gradually expands as the impregnation progresses, so it has the function of suppressing the inrush current, which is preferable in terms of various resistance in the device. . In this case, the aging current is cut off when the electrolytic capacitor is separated from the electrolytic solution.

Since the vacuum impregnation and the aging are originally separate processes, for example, the electrolytic capacitor is set in one vacuum impregnation tank to carry out vacuum impregnation, and then transferred to another electrolytic solution tank for aging. However, in that case, the process time including the vacuum impregnation and the aging is of course shortened, and it is not necessary to provide the cathode electrode in the vacuum impregnation tank dedicated to the vacuum impregnation. Disappear.

[0083]

The method and apparatus for manufacturing an electrolytic capacitor according to the present invention includes a resin case which is provided with an opening for injecting an electrolytic solution, has a built-in capacitor body, and hermetically seals lead terminals with resin. The electrolytic capacitor part is attached to a capacitor supporting member also serving as a positive-side power supply voltage supply path in the vacuum impregnation tank, and at least the opening for injecting the electrolytic solution is immersed in the electrolytic solution in the vacuum impregnating tank so as to be in the resin case. Is subjected to vacuum impregnation so that the anode foil of the capacitor body is on the positive electrode side and the electrolytic solution is on the negative electrode side, and an aging current for forming an oxide film is passed.

According to the above configuration, hydrogen is generated in the cathode, of course, during the aging of the electrolytic capacitor. However, the cathode is not the cathode foil of the capacitor body but the outside of the resin case of the electrolytic capacitor. Since it is installed, all the hydrogen generated there will be dissipated to the outside, so there will be no accident that the internal pressure of the resin case rises and it will be destroyed. Therefore, it is possible to easily realize an electrolytic capacitor which does not disperse the electrolytic solution, has a long life, and is highly safe.

[Brief description of the drawings]

FIG. 1 is a side sectional explanatory view showing a main part of an electrolytic capacitor manufacturing apparatus used for carrying out the present invention.

FIG. 2 is a side cut side explanatory view showing an essential part of an electrolytic capacitor manufacturing apparatus used when implementing the present invention.

FIG. 3 is a perspective view of a main part showing various capacitor members in process steps for explaining a method for manufacturing a standard electrolytic capacitor.

FIG. 4 is a perspective view of a main part showing various capacitor members in process steps for explaining a method for manufacturing a standard electrolytic capacitor.

FIG. 5 is a perspective view of a main part showing various capacitor members in process steps for explaining a method for manufacturing an improved electrolytic capacitor.

[Explanation of symbols]

1 Lead Terminal 1A Lead Wire 1B Attachment Part 2 Anode Foil 3 Cathode Foil 4 and 5 Separator 6 Wrapping Tape 7 Capacitor Main Body 14 Adhesive Blocker 15 PPS Resin Case 15A Electrolyte Injection and Gas Venting Opening 15B Color Part 16 Adhesive 21 Vacuum Impregnation Tank 22 Electrolyte Inlet Pipe 23 Valve 24 Exhaust Pipe 25 Switching Valve 26 Capacitor Movable Support Member that Also Works as Positive Power Supply Voltage Supply Path 27 Cathode 28 DC Power Supply 29 Ultrasonic Vibration Device 30 Transducer 31 Liquid Temperature Control Unit 32 Electrolyte tank 33 Vacuum pump 34 Exhaust pipe 35 Outside air supply pipe 36 Electrolyte 37 Electrolytic capacitor 37 in the process of completion 37A Anode lead terminal 37B Cathode lead terminal 38 Hydrogen bubble

Claims (5)

[Claims] 1. A positive-side power supply voltage supply path for an electrolytic capacitor part including a resin case having an opening for injecting an electrolytic solution and having a built-in capacitor body and hermetically sealing lead terminals with a resin in a vacuum impregnation tank. A step of attaching to the capacitor supporting member which also serves as: a step of immersing at least the electrolytic solution injection opening in the electrolytic solution in the vacuum impregnation tank to perform vacuum impregnation in the resin case; And a step of passing an aging current for forming an oxide film on the positive electrode side and the electrolytic solution on the negative electrode side, the method for producing an electrolytic capacitor. 2. The method for producing an electrolytic capacitor according to claim 1, wherein ultrasonic vibration is applied to the electrolytic solution in the vacuum impregnation tank in order to transmit ultrasonic vibration to the anode foil of the capacitor body. 3. The method of manufacturing an electrolytic capacitor according to claim 1, further comprising a step of performing vacuum impregnation again after the aging is completed. 4. A capacitor supporting member which projects into the vacuum impregnation tank and also serves as a positive power supply voltage supply path, and an electrode which is present in the electrolyte solution in the vacuum impregnation tank and acts as a cathode with the electrolyte solution on the negative electrode side. An apparatus for manufacturing an electrolytic capacitor, which is characterized by being provided. 5. An electrolytic capacitor manufacturing apparatus according to claim 4, further comprising an ultrasonic vibration device for transmitting ultrasonic vibration to the electrolytic solution.