JPH09213591A - Aluminium electrolytic capacitor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminium electrolytic capacitor with no scattering of an electrolytic liquid for driving outside a case even when a capacitor element is inserted in a case into which the electrolytic liquid for driving is injected. SOLUTION: In order that an electrolytic liquid 12 for driving displaced when a capacitor element 14 is inserted inside a case 11, into which the electrolytic liquid 12 is injected, may fall into place in a space of a case 11, whose opening part is to be sealed by a sealing body 15, an inner capacity of the case 11 is made to be larger than the sum of a volume of the electrolytic liquid 12 for driving, a volume of the capacitor element 14, and the volume of the sealing body 15 to be mounted on a pair of lead wires in the capacitor element 14.

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 various electronic devices and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional aluminum electrolytic capacitor of this type has been manufactured through the respective steps as shown in FIGS. First, as shown in FIG. 3 (a), a fixed amount of the driving electrolyte 3 is injected into the case 1 having a bottomed cylindrical shape made of aluminum through a nozzle 2, and then, FIGS.
As shown in FIG. 5, a capacitor having a sealing body 5 attached to a pair of lead wires 4 which are formed by winding an anode foil and a cathode foil with a separator interposed therebetween and which are connected to the anode foil and the cathode foil. The element 6 is inserted into the case 1 in which the driving electrolytic solution 3 is placed, and then, as shown in FIG. 3D, the portion of the case 1 corresponding to the sealing body 5 is drawn to form a case. The opening 1 was sealed.

[0003]

However, in the above-mentioned conventional aluminum electrolytic capacitor, the capacitor element 6 in which the sealing body 5 is attached to the pair of lead wires 4 is placed in the case 1 in which the driving electrolytic solution 3 is contained. 3C, as shown in FIG. 3C, at the moment when the capacitor element 6 hits the driving electrolyte solution 3, air enters the driving electrolyte solution 3 and the amount of the volume displaced by the air is displaced. The driving electrolytic solution 3 was scattered through the gap between the case 1 and the sealing body 5 to the opening of the case 1 and the outer surface of the sealing body 5. When the driving electrolyte solution 3 is thus scattered, the small amount of the driving electrolyte solution 3 contained in the case 1 is originally contained in the small-sized aluminum electrolytic capacitor. There is a problem that the variation of the amount of the electrolyte solution 3 becomes relatively large and the life is shortened.

Further, when the driving electrolytic solution 3 scattered in the opening of the case 1 or the sealing body 5 adheres between the pair of lead wires 4 constituting the anode and the cathode, the leakage current becomes large and the aluminum electrolytic capacitor After mounting on the printed circuit board, if the driving electrolyte solution 3 adheres to the printed circuit board,
There is a problem that the wiring of the printed circuit board may be corroded.

In view of the above-mentioned problems of the prior art, the present invention provides aluminum electrolysis in which the driving electrolyte does not scatter outside the case even when the capacitor element is inserted into the case into which the driving electrolyte is injected. An object of the present invention is to provide a capacitor and a manufacturing method thereof.

[0006]

In order to achieve the above object, an aluminum electrolytic capacitor of the present invention comprises a case having a cylindrical shape with a bottom, a driving electrolytic solution injected into the case, and an insertion into the case. And a sealing body that is attached to a pair of lead wires in the capacitor element and that seals the opening of the case when the capacitor element is inserted into the bottomed tubular case. The inner volume of the bottom cylindrical case is defined as the volume of the driving electrolytic solution injected into the bottomed cylindrical case, the volume of the capacitor element inserted in the bottomed cylindrical case, and the pair of the capacitor elements. It is configured to be larger than the sum of the volumes of the sealing bodies attached to the lead wires of the above. According to this configuration, when the capacitor element is inserted in the case into which the driving electrolyte is injected, Also, those will not be driving electrolyte is scattered to the outside of the case.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a bottomed cylindrical case, a driving electrolytic solution injected into the case, and a capacitor element inserted into the case. A bottomed tubular case, which is attached to a pair of lead wires of the capacitor element, and which has a sealing body that seals the opening of the case when the capacitor element is inserted into the bottomed tubular case. The volume of the drive electrolyte injected into the bottomed cylindrical case, the volume of the capacitor element inserted into the bottomed cylindrical case, and the pair of lead wires of the capacitor element It is configured to be larger than the sum of the volume of the sealed body,
According to this configuration, the inner volume of the bottomed tubular case is equal to the volume of the driving electrolyte injected into the bottomed tubular case,
Since it is configured to be larger than the sum of the volume of the capacitor element inserted in the bottomed cylindrical case and the volume of the sealing body attached to the pair of lead wires of this capacitor element, the driving electrolytic solution is When the capacitor element is inserted into the injected case, the capacitor element comes into contact with the driving electrolyte solution and air enters the driving electrolyte solution, and the volume of driving electrolyte solution displaced by the air is stored in the case. Even if the inside of the case rises, due to the large inner volume of the bottomed cylindrical case, the opening of the case is sealed before the driving electrolyte solution of the volume displaced by the air overflows from the opening of the case. It will be sealed by the body, and as a result, the driving electrolyte will not splatter to the opening of the case or the outer surface of the sealing body as in the conventional case. There is no longer a decrease in the amount of liquid that shortens the service life, and there is no longer the increase in leakage current caused by the scattering of drive electrolyte that has spread between a pair of lead wires as in the past. The problem of corrosion of the wiring due to the scattering of the driving electrolytic solution on the printed circuit board on which is mounted is also eliminated.

According to a second aspect of the present invention, a case having a cylindrical shape with a bottom, a driving electrolytic solution injected into the case, a capacitor element inserted into the case, and a pair of the capacitor element are provided. When combining with the sealing body attached to the lead wire, the inner volume of the bottomed cylindrical case
The volume of the driving electrolyte injected into the bottomed cylindrical case, the volume of the capacitor element inserted into the bottomed cylindrical case, and the sealing body attached to the pair of lead wires of the capacitor element. While being configured to be larger than the sum of the volumes, the sealing body is formed larger than the opening of the case, and in this state, after injecting the driving electrolytic solution into the case, the outlet part is formed from the opening of the case. Insert the capacitor element into the case through a funnel having a smaller sealing body guide, and further insert the capacitor element so as to contact the driving electrolyte solution, and insert the capacitor element into the driving electrolyte solution. A case in which the opening of the case is sealed by the sealing body before the electrolyte for driving that has been pushed away and overflows from the opening of the case According to the method of manufacturing the aluminum electrolytic capacitor, after injecting driving electrolyte into the case,
The capacitor element is inserted into the case through a funnel having a sealing body guide portion whose outlet portion is smaller than the opening portion of the case, and this capacitor element is further inserted so as to come into contact with the driving electrolyte, and this capacitor element is Since the opening of the case is sealed by the sealing body before the volume of the driving electrolyte that is inserted into the driving electrolyte and pushed out, overflows from the opening of the case, The driving electrolyte will not be scattered on the opening of the case or the outer surface of the sealing body, and as a result,
The driving electrolyte solution is not reduced and the service life is not shortened.

According to a third aspect of the present invention, there is provided a bottomed cylindrical case, a driving electrolytic solution injected into the case, a capacitor element inserted into the case, and a pair of capacitor elements. In combination with the sealing body attached to the lead wire, the sealing body is formed larger than the opening of the case, and after the driving electrolytic solution is injected into the case inserted into the case holder, the case is held. The funnel is provided with a sealing body guide portion having an outlet portion smaller than the opening portion of the case on the case opening side of the case holder to keep airtightness by closely adhering through the packing, and at the same time, the capacitor element Insert the capacitor through the sealing body guide to a position where it does not come into contact with the liquid surface of the driving electrolyte in the case, and Keep the mouth guide air-tight, and in this state, provide air in the air-tight chamber that was kept airtight with the case holder and the funnel and the capacitor element sealing body on either or both of the funnel and the case holder. By forcibly discharging with the air discharge device from the air discharge hole, after inserting the capacitor element into the case and sealing the opening of the case with the sealing element of the capacitor element, the internal pressure in the case is reduced. It is designed to be lower than atmospheric pressure, and according to the manufacturing method of this aluminum electrolytic capacitor,
The opening side of the case holder that holds the case is kept airtight by making the outlet side of the funnel, which has a sealing body guide part whose outlet portion is smaller than the opening portion of the case, adhere tightly through packing, and the capacitor element By inserting it through the funnel's sealing body guide to a position where it does not come into contact with the liquid surface of the driving electrolyte in the case, keep the sealing element of the funnel airtight with the sealing body of the capacitor element.
In this state, the air in the airtight chamber, which is kept airtight by the case holder and the sealing element of the capacitor element together with the funnel, is forced by the air discharge device from the air discharge hole provided in either or both of the funnel and the case holder. Since it is designed to be discharged, after inserting the capacitor element into the case from this state and sealing the opening of the case with the sealing element of the capacitor element, the internal pressure in the case is lower than atmospheric pressure. As a result, even if the sealing strength of the opening of the case by the sealing body is weak, the sealing body will not pop out of the case, and even when this aluminum electrolytic capacitor is used as a chip type, Since the internal pressure inside is lower than the atmospheric pressure, the heat resistance during reflow soldering can be improved.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 (a) to 1 (e) show a step of inserting a capacitor element into a case in an aluminum electrolytic capacitor according to an embodiment of the present invention, in which 11 is a bottomed cylindrical case made of aluminum. A fixed amount of the driving electrolyte solution 12 is injected into the case 11. 1
3 is a funnel, and the funnel 13 is provided with a sealing body guide portion 13a having an outlet portion smaller than the opening portion of the case 11. Reference numeral 14 denotes a capacitor element, which is formed by winding an anode foil and a cathode foil with a separator interposed therebetween, and a pair of lead wires (not shown) connected to the anode foil and the cathode foil. The columnar sealing body 15 made of rubber is attached to (1). The outer shape of the sealing body 15 is slightly larger than the inner diameter of the opening of the case 11. 16 is a capacitor element 1
4 is a capacitor element holder for holding the capacitor element 14 by chucking a pair of lead wires (not shown) in FIG.

Next, the procedure for inserting the capacitor element 14 into the case 11 will be described. First, as shown in FIG. 1 (a), a driving electrolyte solution 12 is injected into a case 11, and a sealing element guide portion in which a sealing element 15 portion of a capacitor element 14 is formed on a funnel 13 by a capacitor element holder 16. When the capacitor element holder 16 is moved downward as shown in FIG. 1B, the sealing body 15 is compressed by the sealing body guide portion 13a formed on the funnel 13. Thus, the compression is completed at the outlet of the sealing body guide portion 13a. After that, as shown in FIG. 1C, the capacitor element holder 16 is moved further downward, so that the capacitor element 14 is inserted into the driving electrolytic solution 12 injected into the case 11. By inserting the capacitor element 14, the driving electrolyte solution 12 injected into the case 11 is inserted.
Is displaced, and the volume of the displaced driving electrolyte 12 rises in the case 11, but before the driving electrolyte 12 overflows from the opening of the case 11,
As shown in FIG. 1D, the sealing body 15 is press-fitted into the opening of the case 11 to seal the opening of the case 11. In this case, the internal volume of the case 11 is
Volume of the driving electrolyte solution 12 injected into the case 1, case 11
Volume of the capacitor element 14 to be inserted therein and a pair of lead wires in the capacitor element 14 (not shown)
Since it is configured to be larger than the sum of the volumes of the sealing body 15 attached to the case, even if the capacitor element 14 is inserted to the proper position by the capacitor element holder 16 as shown in FIG. The driving electrolytic solution 12 in 11 is accommodated in the space of the case 11 sealed by the sealing body 15, and therefore the driving electrolytic solution is formed in the opening of the case 11 and the outer surface of the sealing body 15 as in the conventional case. The liquid 12 does not splash. Thereafter, the capacitor element holder 16 shown in FIG. 1 (e) is removed from the pair of lead wires (not shown) in the capacitor element 14, and the opening of the case 11 is drawn to completely seal it. Manufactures aluminum electrolytic capacitors.

In the configuration of FIGS. 1A to 1E described above, in one embodiment of the present invention, as described above, the internal volume of the case 11 is injected into the case 11 for driving. It is configured to be larger than the sum of the volume of the electrolytic solution 12, the volume of the capacitor element 14 inserted in the case 11, and the volume of the sealing body 15 attached to a pair of lead wires (not shown) in the capacitor element 14. That is, when the capacitor element 14 is inserted into the driving electrolytic solution 12 in the case 11, the driving electrolytic solution 12 displaced by the capacitor element 14 is sealed by the sealing body 1.
The inner volume of the case 11, the volume of the driving electrolyte solution 12, the volume of the capacitor element 14, and the volume of the capacitor element 14 so that the volume is accommodated in the space of the case 11 sealed by 5.
The volume of the sealing body 15 attached to the pair of lead wires (not shown) in FIG.

FIG. 2 shows another embodiment of the present invention, and this other embodiment shows one step of forcibly discharging the air in the case 11 to the outside. That is, in the other embodiment, after the driving electrolytic solution 12 is injected into the case 11, the case holder 17 for holding the case 11 has a sealing body guide portion having an outlet portion smaller than the opening portion of the case 11. The outlet side of the funnel 13 having 13a is kept airtight by closely contacting it with the packing 18 and then the capacitor element holder 16 is moved downward, whereby the sealing body guide portion 13a formed on the funnel 13 seals the sealing body. 15 is compressed, and the sealing body 15 is completely compressed at the exit portion of the sealing body guide portion 13a. In this state, the capacitor element 14 is inserted up to a position where it does not come into contact with the liquid surface of the driving electrolytic solution 12 injected into the case 11, and when the compression of the sealing body 15 is completed, the capacitor element 14 is added to the funnel 13. The formed sealing body guide portion 13a is a sealing body 15 for the capacitor element 14.
Keeps airtightness. Thereafter, the air in the airtight chamber, which is kept airtight by the case holder 17, the funnel 13 and the sealing body 15 of the capacitor element 14, is supplied to the funnel 13.
9 and the case holder 17 is forcibly discharged to the outside through an air discharge hole 20 provided in the case holder 17. In this case, since the driving electrolytic solution 12 is collected on the bottom of the case 11, the driving electrolytic solution 12 does not scatter due to a change in atmospheric pressure. Then, after this, FIG. 1C shown in the embodiment of the present invention.
As shown in (d), by moving the capacitor element holder 16 further downward,
Is inserted into the case 11, and the sealing body 15 is press-fitted into the opening of the case 11 to seal the opening of the case 11. In this case, the inner volume of the case 11 is defined as the volume of the driving electrolytic solution 12 injected into the case 11, the volume of the capacitor element 14 inserted into the case 11, and the pair of lead wires in the capacitor element 14 (not shown). Since it is configured to be larger than the sum of the volumes of the sealing body 15 mounted in (1), even if the capacitor element holder 16 inserts the capacitor element 14 to the proper position as shown in FIG. The driving electrolytic solution 12 in the case 11 is accommodated in the space of the case 11 sealed by the sealing body 15, and therefore, is driven to the opening of the case 11 or the outer surface of the sealing body 15 as in the conventional case. The electrolytic solution 12 does not scatter. And after this, FIG. 1 (e)
The capacitor element holder 16 shown in FIG.
By removing the funnel 13 from the case holder 17, removing the case 11 from the case holder 17, and then subjecting the opening of the case 11 to drawing. ,
Manufactures aluminum electrolytic capacitors.

In another embodiment of the present invention shown in FIG. 2 described above, the liquid surface of the driving electrolytic solution 12 injected into the case 11 through the sealing body guide portion 13a formed on the funnel 13 of the capacitor element 14. The sealing body guide portion 13a formed on the funnel 13 by the sealing body 15 of the capacitor element 14 is kept airtight by inserting it to a position where it does not come in contact with the case holder 17 and the sealing of the funnel 13 and the condenser element 14 in this state. The air in the airtight chamber kept airtight by the body 15 is forcibly discharged to the outside from the air discharge hole 19 provided in the funnel 13 and the air discharge hole 20 provided in the case holder 17 by using the forced air discharge device. Therefore, after that, by further inserting the capacitor element 14 into the case 11, the sealing body 1 of the capacitor element 14 is inserted.
After 5 is press-fitted into the opening of the case 11 to perform sealing, the internal pressure in the case 11 becomes lower than the atmospheric pressure, whereby the opening of the sealing body 15 into the opening of the case 11 is reduced. Even if the press-fitting strength is weak, the sealing body 15 does not pop out of the case 11. Also when using this aluminum electrolytic capacitor as a chip type,
Since the internal pressure in the case 11 is lower than atmospheric pressure,
The heat resistance during reflow soldering can be improved.

In the other embodiment of the present invention described above, the funnel 13 is provided with the air discharge hole 19 and the case holder 17 is also provided with the air discharge hole 20. The holes may be provided in only one of the funnel 13 and the case holder 17.

[0016]

As described above, the aluminum electrolytic capacitor of the present invention has a bottomed cylindrical case, a driving electrolytic solution injected into the case, a capacitor element inserted into the case, and The bottomed tubular case is provided with a sealing body that is attached to a pair of lead wires in the capacitor element and that seals the opening of the case when the capacitor element is inserted into the bottomed tubular case. The product is attached to the volume of the driving electrolytic solution injected into the bottomed cylindrical case, the volume of the capacitor element inserted into the bottomed cylindrical case, and the pair of lead wires of the capacitor element. Since it is configured to be larger than the total volume of the sealing body, when the capacitor element is inserted into the case filled with the driving electrolyte solution, the capacitor element comes into contact with the driving electrolyte solution and the Even if air enters the liquid and the volume of driving electrolyte displaced by the air rises in the case, the volume displaced by the air is large due to the large inner volume of the bottomed cylindrical case. By closing the opening of the case with the sealing body before the driving electrolyte for a minute overflows from the opening of the case,
This prevents the driving electrolyte from splashing to the opening of the case or the outer surface of the sealing body as in the conventional case, so that the amount of the driving electrolyte does not decrease and the life is shortened. Wiring does not occur because the driving electrolyte scattered between the pair of lead wires does not increase the leakage current, and furthermore the scattering of the driving electrolyte adheres to the printed circuit board on which the aluminum electrolytic capacitor is mounted. It also eliminates the problem of corrosion.

[Brief description of drawings]

FIG. 1A to FIG. 1E are process diagrams of inserting a capacitor element into a case in an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a process chart for forcibly discharging the air in the case of the aluminum electrolytic capacitor according to another embodiment of the present invention to the outside.

3A to 3D are process diagrams showing a method for manufacturing a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 11 Case 12 Driving Electrolyte 13 Funnel 13a Sealing Body Guide 14 Capacitor Element 15 Sealing Body 17 Case Holder 18 Packing 19 Air Discharge Hole 20 Air Discharge Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Yabushita 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A bottomed cylindrical case, a driving electrolytic solution injected into the case, a capacitor element inserted into the case, and a pair of lead wires attached to the capacitor element, and And a sealing body for sealing the opening of the case when the capacitor element is inserted into the cylindrical case having a bottom, and the inner volume of the cylindrical case having a bottom is set in the cylindrical case having a bottom. Volume of the driving electrolyte injected,
An aluminum electrolytic capacitor configured to be larger than the sum of the volume of a capacitor element inserted in a cylindrical case with a bottom and the volume of a sealing body attached to a pair of lead wires of this capacitor element. 2. A bottomed cylindrical case, a driving electrolytic solution injected into the case, a capacitor element inserted into the case, and a sealing member attached to a pair of lead wires of the capacitor element. When combining with the body,
In the bottomed tubular case, the internal volume is defined as the volume of the drive electrolyte injected into the bottomed tubular case, the volume of the capacitor element inserted in the bottomed tubular case, and While being configured to be larger than the sum of the volumes of the sealing bodies mounted on the pair of lead wires, the sealing body is formed larger than the opening of the case, and in this state,
After injecting the driving electrolytic solution into the case, the capacitor element is inserted into the case through a funnel having a sealing body guide portion having an outlet portion smaller than the opening portion of the case, and the capacitor element further drives the electrolytic solution. Insert the capacitor element so that it contacts the liquid, and then insert the capacitor element into the driving electrolyte solution and push it away. A method for manufacturing an aluminum electrolytic capacitor, which is configured to perform sealing of. 3. A bottomed cylindrical case, a driving electrolytic solution injected into the case, a capacitor element inserted into the case, and a seal attached to a pair of lead wires of the capacitor element. When combining with the body,
After forming the sealing body larger than the opening of the case and injecting the driving electrolytic solution into the case inserted into the case holder, the outlet part is provided on the case opening side of the case holder that holds the case. The outlet side of the funnel having a sealing body guide portion smaller than the opening portion of the case is kept airtight by tightly adhering it through a packing, and the capacitor element is passed through the sealing body guide portion of the funnel to remove the driving electrolyte solution in the case. Keep the airtightness of the funnel's sealing body guide part with the sealing element of the capacitor element by inserting it until it does not come into contact with the liquid surface.In this state, keep the case holder and funnel together with the sealing element of the capacitor element. Allow air in a closed room to pass through either the funnel or case holder,
Or, by forcibly discharging with an air discharge device from the air discharge hole provided in both, after that, after further inserting the capacitor element into the case and sealing the opening of the case with the sealing body of the capacitor element, A method for manufacturing an aluminum electrolytic capacitor in which the internal pressure in the case is lower than atmospheric pressure.