JPH10223479A - Aluminum electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum electrolytic capacitor, the capacitor element of which does not deteriorate in service life, due to the flowing out of a driving electrolyte which impregnates the element from the element nor corroded due to a detergent, such as the halogen-based organic solvent, etc., flowing in the element. SOLUTION: This aluminum electrolytic capacitor is provided with a sealing body 24, which is attached to the opening of a bottomed case 23 housing a capacitor element 21, and constituted by sticking a rubber-like elastic body 26 to one surface of a hard insulating plate 25 and external terminals 27 and 28, which are positioned on the elastic body 26 side of the sealing body 24 and attached to the body 24 with rivets 29 and 30, passing through rivet passing holes 26a and 25a of the body 24. In addition, protrusions 32, 32a, 33, and 33a are provided so as to surround the rivet through-hole 26a of the elastic body 26 one round or more at the parts of the external terminals 27 and 28, which come into contact with the surface of the elastic body 26.

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 for various electronic devices.

[0002]

2. Description of the Related Art A conventional aluminum electrolytic capacitor of this type has a configuration as shown in FIG. That is, in FIG. 6, reference numeral 1 denotes a capacitor element, and this capacitor element 1 is formed by winding an anode foil and a cathode foil each connected to one end of a lead plate 2a, 2b with a separator interposed therebetween. ing.

After being impregnated with a driving electrolyte, the capacitor element 1 is housed in a bottomed case 3 made of a bottomed cylindrical metal. Reference numeral 4 denotes a sealing body which is attached to the opening of the bottomed case 3 and seals the opening of the bottomed case 3. The sealing body 4 is formed by bonding a rubber-like elastic body 6 to one surface of a hard insulating plate 5. Have been. 7 and 8 are L
The pair of external terminals 7 and 8 are disposed on the rubber-like elastic body 6 side of the sealing body 4, and a pair of rivets 9 and 10 penetrating the sealing body 4. Is attached to the sealing body 4 by the

The pair of rivets 9 and 10 are pressed into rivet through holes 7a and 8a provided in the bases of the pair of external terminals 7 and 8, respectively, and are prevented from coming off at the roots of the pair of rivets 9 and 10. Large diameter parts 9a, 10a
Is formed. The pair of rivets 9 and 10 are press-fitted into rivet through holes 6a and 5a provided in the rubber-like elastic body 6 and the hard insulating plate 5, respectively, and protrude toward the capacitor element 1 side.
, One washer 11, the other ends of the lead plates 2a and 2b connected to the capacitor element 1, and the other washer 12 are sequentially fitted, and a pair of rivets 9 and 1 are inserted.
By crimping the tip of the pair of external terminals 7, 8
And the other ends of the lead plates 2a and 2b are fixed to a pair of rivets 9 and 10, respectively.

After the sealing element 4 and the capacitor element 1 are integrated as described above, the capacitor element 1 is impregnated with a driving electrolyte to house the capacitor element 1 in the bottomed case 3 and to form the sealing element 4 Is positioned at the opening of the bottomed case 3, and the opening of the bottomed case 3 is subjected to a horizontal drawing process, and the opening end of the bottomed case 3 is subjected to a curling process so that the sealing body 4 is closed. 3 is attached to the opening.

[0006]

However, only the structure of the sealing body 4 in the above-mentioned conventional aluminum electrolytic capacitor has a structure in which the contact surface between one washer 11 and the hard insulating plate 5 passes through the rivet through holes 5a and 6a. The driving electrolytic solution impregnated in the capacitor element 1 flows out through the path leading to the contact surface between the external terminals 7, 8 and the rubber-like elastic body 6 to reduce the life of the aluminum electrolytic capacitor, or A cleaning agent such as a halogen-based organic solvent used for cleaning the solder flux passes through the rivet through-holes 6a and 5a from the contact surfaces between the external terminals 7 and 8 and the rubber-like elastic body 6 and is hardened with one washer 11. It flows into the capacitor element 1 through a path leading to the contact surface with the insulating plate 5, whereby
There is a problem that the capacitor element 1 is corroded.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The driving electrolyte impregnated in the capacitor element flows out to shorten the life of the capacitor element. It is an object of the present invention to provide an aluminum electrolytic capacitor which does not cause corrosion of the capacitor element by flowing into the aluminum electrolytic capacitor.

[0008]

In order to achieve the above object, an aluminum electrolytic capacitor according to the present invention comprises an anode foil and a cathode foil each connected to one end of a lead plate wound with a separator interposed therebetween. , A driving electrolyte to be impregnated in the capacitor element, a bottomed case for accommodating the capacitor element, and a rubber mounted on an opening of the bottomed case and a hard insulating plate on one side. A sealing body formed by bonding elastic bodies, an external terminal located on the rubber-like elastic body side of the sealing body, and an external terminal attached to the sealing body by a rivet that passes through a rivet through hole of the sealing body; By caulking the tip of the rivet that protrudes toward the capacitor element through the rivet through hole of the body, the tip of the rivet together with the other end of the lead plate The external terminal is provided with one or more protrusions so as to surround a rivet through hole of the rubber-like elastic body at a portion in contact with the surface of the rubber-like elastic body. In addition, the driving electrolyte impregnated in the capacitor element is prevented from flowing out to shorten the service life, and the cleaning agent such as a halogen-based organic solvent flows into the capacitor element and does not corrode the capacitor element. It is.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a capacitor formed by winding an anode foil and a cathode foil each having one end of a lead plate connected thereto with a separator interposed therebetween. Element, a driving electrolyte to be impregnated in the capacitor element, a bottomed case for housing the capacitor element, and a rubber-like elastic body attached to an opening of the bottomed case and attached to one surface of a hard insulating plate. A sealing member formed by joining together, an external terminal attached to the sealing member by a rivet positioned on the rubber-like elastic body side of the sealing member and passing through a rivet through hole of the sealing member, and a rivet through hole of the sealing member. And a washer attached to the leading end of the rivet together with the other end of the lead plate by caulking the leading end of the rivet protruding toward the capacitor element side, The external terminal is provided with one or more protrusions so as to surround the rivet through hole of the rubber-like elastic body at a portion in contact with the surface of the rubber-like elastic body. According to this configuration, the drive impregnated in the capacitor element is provided. Even if the electrolyte for electrolyte tries to flow out through the rivet through hole of the sealing body,
Since the protrusion provided at least one round so as to surround the rivet through hole of the rubber-like elastic body at a portion in contact with the surface of the rubber-like elastic body of the external terminal bites into the rubber-like elastic body to maintain strong airtightness, The projecting portion prevents the driving electrolyte from flowing out. As a result, the life of the aluminum electrolytic capacitor due to a decrease in the amount of the driving electrolyte can be prevented.

In addition, even if a cleaning agent such as a halogen-based organic solvent used for cleaning the solder flux tries to flow into the capacitor element from the external terminal through the rivet through hole of the sealing member, the rubber-like elasticity of the external terminal is reduced. At least one round of the protrusion provided around the rivet through hole of the rubber-like elastic body at a portion in contact with the body surface cuts into the rubber-like elastic body to maintain strong airtightness. The portion prevents the sealing body from entering the rivet through hole, and as a result, corrosion of the capacitor element due to the cleaning agent flowing into the capacitor element can be prevented.

According to a second aspect of the present invention, there is provided a capacitor element formed by winding an anode foil and a cathode foil each having one end of a lead plate connected thereto with a separator interposed therebetween, and A driving electrolyte to be impregnated, and a bottomed case for housing the capacitor element,
A sealing body attached to the opening of the bottomed case and formed by bonding rubber-like elastic bodies to both surfaces of a hard insulating plate, and a rubber-like elastic body side of the sealing body opposite to the capacitor element in the sealing body External terminals attached to the sealing body by rivets that penetrate the sealing body located at
A washer attached to the tip of the rivet so as to contact the rubber-like elastic body surface together with the other end of the lead plate by caulking the tip of the rivet that protrudes toward the capacitor element through the sealing body. According to this structure, the washer is provided with one or more protrusions at a portion in contact with the surface of the rubber-like elastic body so as to surround the rivet through hole of the rubber-like elastic body. Even if the electrolyte for electrolyte flows to the outside through the rivet through hole of the sealing body, at least one round is provided at a portion of the washer in contact with the rubber elastic body surface so as to surround the rubber rivet through hole. Since the rubber electrolyte penetrates the rubber-like elastic body and maintains strong airtightness, the driving electrolyte is prevented from entering the rivet through hole of the sealing body by this projection, As a result, reduction of the service life of the aluminum electrolytic capacitor according to a driving electrolytic solution outflow to driving electrolyte volume to the outside is reduced even those that can be prevented.

Further, even if a cleaning agent such as a halogen-based organic solvent used for cleaning the solder flux enters the rivet through hole of the sealing body from the external terminal portion, it may be applied to a portion of the washer that contacts the rubber-like elastic body surface. The protrusions provided at least one round so as to surround the rivet through-holes of the rubber-like elastic body bite into the rubber-like elastic body to maintain strong airtightness. However, the projections prevent the cleaning agent from flowing into the capacitor element, and as a result, corrosion of the capacitor element due to the cleaning agent flowing into the capacitor element can be prevented.

According to a third aspect of the present invention, there is provided a capacitor element formed by winding an anode foil and a cathode foil each connected to one end of a lead plate with a separator interposed therebetween, and A driving electrolyte to be impregnated, and a bottomed case for housing the capacitor element,
A sealing body attached to the opening of the bottomed case and formed by bonding rubber-like elastic bodies to both surfaces of a hard insulating plate, and a rubber-like elastic body side of the sealing body opposite to the capacitor element in the sealing body External terminals attached to the sealing body by rivets that penetrate the sealing body located at
A washer attached to the tip of the rivet so as to contact the rubber-like elastic body surface together with the other end of the lead plate by caulking the tip of the rivet that protrudes toward the capacitor element through the sealing body. One or more round projections are provided so as to surround a rivet through hole of the rubber-like elastic body at a portion of the external terminal that contacts the rubber-like elastic body surface and a part of the washer that contacts the rubber-like elastic body surface. According to this configuration, even if the driving electrolyte impregnated in the capacitor element is about to flow out of the sealing body, the portion of the washer in contact with the rubber-like elastic body surface surrounds the rivet through hole of the rubber-like elastic body. Since the protrusions provided in one or more turns into the rubber-like elastic body to maintain a strong airtightness, the driving electrolyte is pierced by the rivets of the sealing body by the protrusions. Would be prevented from entering the holes, as a result, reduction of the service life of the aluminum electrolytic capacitor according to a driving electrolytic solution outflow to driving electrolyte volume to the outside is reduced even those that can be prevented.

Further, even if a cleaning agent such as a halogen-based organic solvent used for cleaning the soldering flux tries to flow into the capacitor element from the external terminal through the rivet through hole of the sealing member, the rubber-like elasticity of the external terminal does not increase. At least one round of the protrusion provided around the rivet through hole of the rubber-like elastic body at a portion in contact with the body surface cuts into the rubber-like elastic body to maintain strong airtightness. The portion prevents the sealing body from entering the rivet through hole, and as a result, corrosion of the capacitor element due to the cleaning agent flowing into the capacitor element can be prevented.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. (Embodiment 1) FIG. 1 is a sectional view of an aluminum electrolytic capacitor according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 21 denotes a capacitor element, and the capacitor element 21 includes lead plates 22a and 22b. Are wound by winding an anode foil and a cathode foil each having one end thereof connected with a separator interposed therebetween.

After being impregnated with the driving electrolyte, the capacitor element 21 is housed in a bottomed cylindrical case 23 made of aluminum. 24 is bottomed case 2
The sealing body 24 is attached to the opening 3 and seals the opening of the bottomed case 23. The sealing body 24 is formed by bonding a rubber-like elastic body 26 to one surface of a hard insulating plate 25. Reference numerals 27 and 28 denote a pair of external terminals whose bases are bent in an L-shape. The pair of external terminals 27 and 28 are disposed on the rubber-like elastic body 26 side of the sealing body 24 and
4 is formed by a pair of rivets 29 and 30 penetrating through
4. The pair of rivets 29, 30 are press-fitted into rivet through holes 27a, 28a provided at the bases of the pair of external terminals 27, 28, respectively, and the bases of the pair of rivets 29, 30 have diameters for retaining. The large parts 29a and 30a are formed.

The pair of rivets 29, 30 are press-fitted into rivet through holes 26a, 25a provided in the rubber-like elastic body 26 and the hard insulating plate 25, respectively, and protrude toward the capacitor element 21 side. The washer 31 and the other ends of the lead plates 22a and 22b connected to the capacitor element 21 are sequentially inserted into the tips of the rivets 29 and 30, and the tips of the pair of rivets 29 and 30 are swaged. Are fixed to the sealing body 24, and the other ends of the lead plates 22a, 22b are fixed to the pair of rivets 29, 30.

In the first embodiment of the present invention, a portion of the base of the external terminals 27, 28 which is in contact with the surface of the rubber-like elastic body 26 is formed so as to surround the rivet through hole 26a of the rubber-like elastic body 26. Annular projections 32, 33
And annular projections 32, 33
And other annular projections 32a and 33a are provided concentrically on the outer side. These annular projections 3
2, 33, 32a, 33a are a pair of rivets 29, 3
By crimping the end of the pair of external terminals 27 and 2
When the sealing member 8 is fixed to the sealing member 24, the sealing member 8 cuts into the rubber-like elastic member 26 to maintain strong airtightness.

Further, in the aluminum electrolytic capacitor according to the first embodiment of the present invention, after the sealing body 24 and the capacitor element 21 are integrated as described above, the capacitor element 21 is impregnated with a driving electrolytic solution to form the capacitor element 21. While being housed in the bottomed case 23, the sealing body 24 is positioned at the opening of the bottomed case 23,
Of the bottomed case 23
The opening end of the sealing body 2 is subjected to curling processing.
4 is attached to the opening of the bottomed case 23.

As described above, in the first embodiment of the present invention, the rubber-like elastic body 2 at the base of the external terminals 27 and 28 is used.
6 are provided with annular projections 32 and 33 so as to surround the rivet through hole 26a of the rubber-like elastic body 26, and are further positioned outside the annular projections 32 and 33 to provide another one. Since the annular projections 32a and 33a are provided concentrically, the driving electrolyte impregnated in the capacitor element 21 is supplied with the rivet through holes 25a and 2a of the sealing body 24.
6a, the annular projections 32, 33, 32a, 33a bite into the rubber-like elastic body 26 to maintain strong airtightness, so that the outside of the driving electrolyte can be prevented. Outflow to the projections 32, 33, 3
2a, 33a, so that
It is possible to prevent the life of the aluminum electrolytic capacitor from being shortened due to the decrease in the driving electrolyte.

Further, a cleaning agent such as a halogen-based organic solvent used for cleaning the solder flux is applied to the external terminals 27, 27.
The rivet through holes 26a and 25a of the sealing body 24
When the cleaning agent flows into the capacitor element 21 through the ring, the annular projections 32, 33, 32a, and 33a bite into the rubber-like elastic body 26 to maintain strong airtightness. Parts 32, 33, 32a, 33
a prevents the sealing body 24 from entering the rivet through-holes 26a, 25a. As a result, corrosion of the capacitor element 21 due to the cleaning agent flowing into the capacitor element 21 can be prevented. .

(Embodiment 2) FIG. 2 is a sectional view of an aluminum electrolytic capacitor according to Embodiment 2 of the present invention. FIG. 2 shows Embodiment 1 of the present invention shown in FIG. The same numbers are assigned to the same parts as
Here, only differences from FIG. 1 will be described.

That is, in the second embodiment of the present invention shown in FIG. 2, the sealing body 24 attached to the opening of the bottomed case 23 and sealing the opening of the bottomed case 23 is Rubber-like elastic bodies 35 and 36 are attached to both sides, and a rubber-like elastic body 36 is provided on a portion of the washer 31 that contacts the surface of the rubber-like elastic body 36.
Annular projection 3 so as to surround the rivet through hole 36a.
7 and 38, and the annular projections 37 and 3
8, another annular projections 37 a and 38 a are provided concentrically. These annular projections 3
7, 38, 37a, 38a are a pair of rivets 29, 3
By crimping the end of the pair of external terminals 27 and 2
When the sealing member 8 is fixed to the sealing member 24, the sealing member 8 cuts into the rubber-like elastic member 36 to maintain strong airtightness.

In the second embodiment of the present invention described above, the rivet through hole 36a of the rubber-like elastic body 36 is formed at the portion of the washer 31 which is in contact with the surface of the rubber-like elastic body 36.
Are provided so as to surround the capacitor element 21 and another annular projection 37a, 38a is provided concentrically outside the annular projections 37, 38. When the driving electrolyte impregnated into the sealing member 24 tries to flow out through the rivet through holes 36a, 34a, 35a of the sealing body 24,
Since the 7, 38, 37a, 38a bites into the rubber-like elastic body 36 to maintain strong airtightness, the outflow of the driving electrolyte to the outside is prevented by the protrusions 37, 38, 37a,
As a result, the life of the aluminum electrolytic capacitor due to the decrease in the driving electrolyte can be prevented.

Further, a cleaning agent such as a halogen-based organic solvent used for cleaning the solder flux is applied to the external terminals 27, 27.
The rivet through holes 35a, 34 of the sealing body 24
a, 36a, the annular projections 37, 38, 37a, 38a
Penetrates into the rubber-like elastic body 36 to maintain strong airtightness.
a, 38a prevents the capacitor element 21 from flowing into the capacitor element 21.
Thus, corrosion of the capacitor element 21 caused by flowing into the capacitor 1 can be prevented.

(Embodiment 3) FIG. 3 is a sectional view of an aluminum electrolytic capacitor according to Embodiment 3 of the present invention. In FIG. 3, Embodiment 2 of the present invention shown in FIG. The same numbers are assigned to the same parts as
Here, only different points from FIG. 2 will be described.

That is, in the third embodiment of the present invention shown in FIG. 3, the sealing body 24 attached to the opening of the bottomed case 23 and sealing the opening of the bottomed case 23 is Rubber-like elastic bodies 35 and 36 are attached to both sides, and a rubber-like elastic body 36 is provided on a portion of the washer 31 that contacts the surface of the rubber-like elastic body 36.
Annular projection 3 so as to surround the rivet through hole 36a.
7 and 38, and the annular projections 37 and 3
8 are provided concentrically with other annular projections 37a, 38a. Further, the portions of the bases of the external terminals 27, 28 in contact with the surface of the rubber-like elastic body 35 are also provided. The annular projections 39, 40 are provided so as to surround the rivet through hole 35a, and another annular projection 39a, 40 is located outside the annular projections 39, 40.
40a are provided concentrically.

In the above-described third embodiment of the present invention, the rivet through hole 36a of the rubber-like elastic body 36 is formed at the portion of the washer 31 which is in contact with the surface of the rubber-like elastic body 36.
Are provided so as to surround the external terminals 27, 28, and other annular protrusions 37a, 38a are provided concentrically outside the annular protrusions 37, 38, and the external terminals 27, 28 are further provided. At the base in contact with the surface of the rubber-like elastic body 35, annular projections 39 and 40 are provided so as to surround the rivet through hole 35a of the rubber-like elastic body 35, and the annular projections 39 and 40 are formed. Since the other annular projections 39a and 40a are provided concentrically on the outside, the driving electrolyte impregnated in the capacitor element 21 is supplied with the rivet through holes 36a, 34a and 3 of the sealing body 24.
Even if an attempt is made to flow out through the 5a, the annular projections 37, 38, 37a, 38a bite into the rubber-like elastic body 36 to maintain strong airtightness. Outflow to the projections 37, 38, 3
7a, 38a, so that
It is possible to prevent the life of the aluminum electrolytic capacitor from being shortened due to the decrease in the driving electrolyte.

Further, a cleaning agent such as a halogen-based organic solvent used for cleaning the solder flux is applied to the external terminals 27, 27.
The rivet through holes 35a, 34 of the sealing body 24
a, 36a, the annular projections 39, 40, 39a, 40a provided at the bases of the external terminals 27, 28 are provided with rubber-like elastic bodies 35.
The cleaning agent is prevented from penetrating into the rivet through holes 35a, 34a, 36a of the sealing body 24 by the projections 39, 40, 39a, 40a because the cleaning agent penetrates into the rivet and maintains strong airtightness. As a result, the cleaning element flows into the capacitor element 21 so that the capacitor element 2
1 can also be prevented beforehand.

In the first and third embodiments of the present invention, the rivet through hole 26a of the rubber-like elastic body 26 is surrounded by the base of the external terminals 27 and 28 at the portion in contact with the surface of the rubber-like elastic body 26. So that the annular projections 32, 33
And annular projections 32, 33
A configuration in which other annular projections 32a, 33a are provided concentrically outside the outer periphery of the rubber-like elastic body 35 at the bases of the external terminals 27, 28 and in contact with the surface of the rubber-like elastic body 35 The annular projections 39 and 40 are provided so as to surround the rivet through hole 35a, and another annular projection 39 is located outside the annular projections 39 and 40.
Although the configuration in which the a and 40a are provided concentrically has been described, as shown in FIG. 4, the portions in contact with the surfaces of the rubber-like elastic bodies 26 and 35 at the bases of the external terminals 27 and 28 are made smooth and annular. Are not provided concentrically, but the rivet through holes 2 of the rubber-like elastic bodies 26 and 35 are provided.
Annular projections 32, 33, 3 so as to surround 6a, 35a.
Even in the configuration in which only the components 9 and 40 are provided, the same effects as those of the first and third embodiments of the present invention can be obtained.

In the second and third embodiments of the present invention, a portion of the washer 31 which is in contact with the surface of the rubber-like elastic body 36 is provided with a rivet through hole 36a of the rubber-like elastic body 36.
In the above description, the annular projections 37 and 38 are provided so as to surround the frame, and the other annular projections 37a and 38a are provided concentrically outside the annular projections 37 and 38. As shown in FIG. 5, the portion of the washer 31 that is in contact with the surface of the rubber-like elastic body 36 is made a gentle surface, and the annular projection is not provided concentrically. Even if only the annular projections 37 and 38 are provided so as to surround the same, the same effects as those of the second and third embodiments of the present invention can be obtained.

The annular projections 32, 33, 32
a, 33a, 37, 38, 37a, 38a, 39, 4
Regarding the tip shapes of 0, 39a, and 40a, an effect can be obtained in any of a flat surface, a curved surface, and a needle shape, and the shape is not limited to a specific shape.

[0033]

As described above, the aluminum electrolytic capacitor of the present invention comprises a capacitor element formed by winding an anode foil and a cathode foil each having one end of a lead plate connected thereto with a separator interposed therebetween. A driving electrolyte to be impregnated in the capacitor element, a bottomed case for accommodating the capacitor element, and a rubber-like elastic body attached to an opening of the bottomed case and one side of a hard insulating plate. And an external terminal attached to the sealing body by a rivet that is located on the rubber-like elastic body side of the sealing body and penetrates the rivet through hole of the sealing body, and penetrates the rivet through hole of the sealing body. And a washer attached to the tip of the rivet together with the other end of the lead plate by caulking the tip of the rivet protruding toward the capacitor element side. In addition, the external terminal is provided with one or more protrusions so as to surround the rivet through-hole of the rubber-like elastic body at a portion in contact with the surface of the rubber-like elastic body. According to this configuration, the capacitor element is impregnated. Even if the driving electrolyte flows to the outside through the rivet through hole of the sealing body, at least one round is provided so as to surround the rivet through hole of the rubber elastic body at a portion in contact with the rubber elastic body surface of the external terminal. Since the protrusions dig into the rubber-like elastic body to maintain strong airtightness, the driving electrolyte is prevented from flowing out to the outside by the protrusions. It is also possible to prevent the life of the aluminum electrolytic capacitor from being shortened due to a decrease in the amount of liquid.

Further, even if a cleaning agent such as a halogen-based organic solvent used for cleaning the soldering flux tries to flow into the capacitor element from the external terminal through the rivet through hole of the sealing member, the rubber-like elasticity of the external terminal may be reduced. At least one round of the protrusion provided around the rivet through hole of the rubber-like elastic body at a portion in contact with the body surface cuts into the rubber-like elastic body to maintain strong airtightness. The portion prevents the sealing body from entering the rivet through hole, and as a result, corrosion of the capacitor element due to the cleaning agent flowing into the capacitor element can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an aluminum electrolytic capacitor according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view of an aluminum electrolytic capacitor according to a second embodiment of the present invention.

FIG. 3 is a sectional view of an aluminum electrolytic capacitor according to a third embodiment of the present invention.

FIG. 4 is a side view showing another shape of the external terminal in the aluminum electrolytic capacitor.

FIG. 5 is a side view showing another shape of the washer in the aluminum electrolytic capacitor.

FIG. 6 is a sectional view showing a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Capacitor element 22a, 22b Lead plate 23 Bottom case 24 Sealing body 25 Hard insulating plate 25a Rivet through hole 26 Rubber-like elastic body 26a Rivet through hole 27, 28 External terminal 29, 30 Rivet 31 Washer 32, 32a, 33, 33a Projection 34 Hard insulating plate 34a Rivet through hole 35, 36 Rubber-like elastic body 35a, 36a Rivet through hole 37, 37a, 38, 38a Projection 39, 39a, 40, 40a Projection

Claims (3)

[Claims] 1. A capacitor element formed by winding an anode foil and a cathode foil each connected to one end of a lead plate with a separator interposed therebetween, and a driving electrolyte impregnated in the capacitor element. And a bottomed case for housing the capacitor element, a sealing body attached to the opening of the bottomed case and formed by bonding a rubber-like elastic body to one surface of a hard insulating plate, An external terminal attached to the sealing body by a rivet that is positioned on the rubber-like elastic body side and penetrates the rivet through hole of the sealing body, and a tip of the rivet that protrudes toward the capacitor element side through the rivet through hole of the sealing body. A washer attached to the leading end of the rivet together with the other end of the lead plate by crimping, and a portion in contact with the rubber-like elastic body surface of the external terminal. An aluminum electrolytic capacitor provided with one or more round protrusions so as to surround a rivet through hole made of rubber-like elastic material. 2. A capacitor element formed by winding an anode foil and a cathode foil each connected to one end of a lead plate with a separator interposed therebetween, and a driving electrolyte impregnated in the capacitor element. And a bottomed case that houses the capacitor element, a sealing body attached to the opening of the bottomed case and formed by bonding rubber-like elastic bodies to both surfaces of a hard insulating plate, An external terminal attached to the sealing body by a rivet that is located on the rubber-like elastic body side opposite to the capacitor element and penetrates the rivet through hole of the sealing body, and a capacitor that penetrates the rivet through hole of the sealing body. By caulking the tip of the rivet protruding toward the element side, the tip of the rivet is brought into contact with the rubber-like elastic body surface together with the other end of the lead plate. With a washer that can be attached,
An aluminum electrolytic capacitor comprising a washer provided with one or more protrusions at a portion in contact with a rubber-like elastic body surface so as to surround a rivet through hole of the rubber-like elastic body. 3. A capacitor element formed by winding an anode foil and a cathode foil each connected to one end of a lead plate with a separator interposed therebetween, and a driving electrolyte impregnated in the capacitor element. And a bottomed case that houses the capacitor element, a sealing body attached to the opening of the bottomed case and formed by bonding rubber-like elastic bodies to both surfaces of a hard insulating plate, An external terminal attached to the sealing body by a rivet that is located on the rubber-like elastic body side opposite to the capacitor element and penetrates the rivet through hole of the sealing body, and a capacitor that penetrates the rivet through hole of the sealing body. By caulking the tip of the rivet protruding toward the element side, the tip of the rivet is brought into contact with the rubber-like elastic body surface together with the other end of the lead plate. With a washer that can be attached,
An aluminum electrolytic capacitor provided with one or more protrusions so as to surround a rivet through hole of a rubber-like elastic body at a portion of the external terminal in contact with the surface of a rubber-like elastic body and a part of the washer contacting with a surface of a rubber-like elastic body. .