JP2000021684A - Capacitor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a capacitor capable of reliably maintaining the sealing property of an outer case. A bottomed cylindrical outer case, a lid, an electrode terminal, and an insulating sealing member integrally formed by insert molding between the lid and the electrode terminal. Prepare.
The electrode terminal 5 includes a shaft portion 6, an inner connection portion 9, and an outer connection portion 1.
1 and a flange 12. The insulating sealing member 6 is disposed at least between the through hole 4 and the shaft portion 7 and between the flange portion 12 and the lid 3. The outer connecting portion 11 is connected to the lead member 10 by soldering or welding. Outer connection part 11
Are screws 15a, 15 screwed to the screw portions 11b, 11c.
The lead member 10 is fixed and connected by b. Collar 12
Has a locking portion 17 for locking the lead member 10, and the insulating sealing member 6 is disposed between the locking portion 17 and the lid 3. The insulating sealing member 6 extends between the lead member 10 and the locking portion 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrolytic capacitor,
The present invention relates to a capacitor such as an electric double layer capacitor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, for example, a capacitor element and an electrolyte solution are accommodated in a cylindrical outer case 2 having a bottom and a metal lid 3 for closing the outer case 2 is provided with an electrode terminal 5.
Is known. The capacitor 21a shown in FIG.
The cover 3 and the electrode terminal 5 are integrally formed by a resin insulating sealing member 6 insert-molded between the cover 3 and the electrode terminal 5. I have. The electrode terminal 5 connects a shaft 7 inserted into the through hole 4 and a lead member 8 connected to the inside of the outer case 2 of the shaft 7 and extending from a current collector (not shown) of the capacitor element. And an outer connecting portion 11 connected to the outer side of the outer case 2 of the shaft portion 7 and connected to a lead member 10 of an external circuit.

[0003] A resin insulating sealing member 6 comprises a shaft 7 and a lid 3.
The outer case 2 is hermetically sealed to prevent the electrolyte solution from leaking and to insulate the shaft 7 from the lid 3. Further, the resin insulating sealing member 6 is formed by forming a resin layer of a predetermined thickness on both front and back surfaces of the lid 3 so that the lead member 10 and the lid 3 of the external circuit and the lid 3 and the lead member are formed. 8 is reliably insulated.

In the capacitor 21a shown in FIG. 8, in order to increase the affinity between the resin insulating sealing member 6 and the electrode terminal 5 or the lid 3 to improve the bonding strength, the electrode terminal 5 and the lid 3 are bonded together. Coating layer of organometallic compound on the surface (not shown)
Is provided.

In the capacitor 21a, as the lead member 10 of the external circuit, for example, a bus bar made of a metal plate such as copper or aluminum is used, and the bus bar is soldered to the protruding portion 11a of the outer connecting portion 11 of the electrode terminal 5. Or they are connected by welding.

However, when the lead member 10 such as the bus bar is connected to the outer connecting portion 11 by soldering or welding, heat of the connecting portion 13 is transferred from the outer connecting portion 11 to the shaft portion 7.
And the quality of the resin-made insulating sealing member 6 in contact with the shaft portion 7 is deteriorated, so that the sealing property of the outer case 2 is reduced.

[0007] As shown in FIG.
A lead member such as a bus bar between a nut 15a screwed to the male screw portion 11b and a resin insulating sealing member 6 provided on the surface of the lid 3; There is known a capacitor 21b that is connected to the outer connection portion 11 by sandwiching the capacitor 10. In the capacitor 21b, the lead member 10 such as the bus bar is sandwiched between the flat washer 22 and the spring washer 14 and attached to the male screw portion 11b. The lead member 10 is further screwed by the nut 15a and connected to the outer connection portion 11. According to the above configuration, when the lead member 10 of the external circuit is connected to the outer connection portion 11, soldering or welding is not used, so that the resin insulating sealing member 6 can be prevented from being deteriorated by heat.

[0008] However, the torque of the capacitor 21b when tightening the screw with the nut 15a causes the shaft 7
There is a disadvantage that shear stress acts on a joint surface between the resin and the resin insulating sealing member 6 to damage the resin insulating sealing member 6 and reduce the sealing property of the outer case 2.

In order to reduce the effect of the shear stress, a plurality of grooves 7a are provided in the shaft 7 along the circumferential direction.
The contact area between the resin insulating sealing member 6 and the shaft 7 is increased,
Attempts have been made to increase the adhesion, but not enough.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a capacitor which can solve the above-mentioned disadvantages and can reliably maintain the hermeticity of a capacitor element and an outer case containing an electrolyte solution. .

[0011]

In order to achieve the above object, a capacitor according to the present invention comprises a bottomed cylindrical outer case for containing a capacitor element and an electrolyte solution, and a metal lid for closing the outer case. Body, an electrode terminal inserted into a through-hole provided in the lid, and insert-molded between the lid and an electrode terminal inserted into the through-hole to form the lid and the electrode terminal. In a capacitor comprising a resin insulating sealing member integrally molded, the electrode terminal is connected to a shaft portion inserted into the through hole and the inside of the outer case of the shaft portion to collect current of the capacitor element. An inner connection portion for connecting a lead member extending from the body, an outer connection portion connected to an outer side of the outer case of the shaft portion and connected to an external circuit, and an outer connection portion parallel to the lid. And a flange that is inserted through the lid and the through hole. The resin-made insulating sealing member that is insert-molded between the electrode terminal and the electrode terminal is disposed at least between the inner surface of the through hole and the shaft portion and between the flange portion and the lid. And

In the capacitor according to the present invention, since the outer connection portion is provided with the flange in parallel with the lid, the heat capacity of the electrode terminal increases, and the outer connection portion is heated when connecting the external circuit. Also, the amount of heat transfer to the shaft portion is reduced. In addition, since the heat generated by the heating is dissipated from the flange to the atmosphere or from the flange to the lid via the resin-made insulating sealing member, the amount of heat transferred to the shaft is further reduced.

Further, in the capacitor of the present invention, since the resin insulating sealing member is disposed between the through hole and the shaft portion and between the flange portion and the lid, the electrode terminal and the resin member are disposed. The contact area with the insulating sealing member made of the resin increases, and the adhesive strength between them increases. As a result, even when a rotation torque acts on the outer connection portion when the external circuit is fixedly connected by a screw screwed to the outer connection portion, the electrode terminal and the electrode terminal are opposed to the rotation torque. Adhesion with the resin insulating sealing member can be maintained.

Therefore, according to the capacitor of the present invention, it is possible to protect the resin-made insulating sealing member in contact with the shaft portion from heat or rotational torque, and to reliably maintain the hermeticity of the outer case.

Therefore, a capacitor according to the present invention includes a protrusion in which the outer connection portion protrudes outward from the flange.
The external circuit may be connected to the lead member by soldering or welding a lead member of the external circuit to the protruding portion. The outer connection portion includes a screw portion, and is screwed to the screw portion. The lead member of the external circuit may be fixed to the flange by a screw and connected to the lead member. The screw portion may form a male screw portion on the outer periphery of the protruding portion, or may form a female screw portion that opens to the outer connection portion in the shaft portion. When forming the external thread portion, the lead member of the external circuit is sandwiched between a nut screwed to the external thread portion and the flange portion and connected to the outside connection portion. Further, when forming the female screw portion, the female screw portion is sandwiched between a head portion of a bolt screwed to the female screw portion and the flange portion and is connected to the outer connection portion.

In the capacitor according to the present invention, when the outer connection portion is connected to the flange portion by fixing a lead member of the external circuit to the flange portion with a screw screwed to the screw portion,
The flange is provided with a locking portion for locking a lead member of the external circuit, and the insulating sealing member is disposed between the locking portion and the lid.

The lead member of the external circuit can be positioned with respect to the capacitor by being locked by a locking portion provided on the flange. The locking portion is configured, for example, by providing a cutout portion on the collar portion that can be locked by a claw portion provided on a lead member of the external circuit.

The insulating portion is provided with the insulating sealing member between the locking portion and the lid, thereby ensuring insulation from the lead member of the external circuit locked by the locking portion. Short circuit can be prevented.

In the capacitor according to the present invention, when the lead member of the external circuit is locked by a locking portion provided on the flange portion, the insulating member is provided between the lead member and the locking portion. The sealing member is extended.

When the lead member of the external circuit is fixed to the flange by the screw screwed to the screw as described above, it is locked by the locking portion provided on the flange. However, at this time, if there is a gap between the lead member and the locking portion, the lead member rotates together with the screw when screwing the screw, and the positioning effect is reduced. I do. Further, when the lead member rotates together with the screw, the lead member comes into contact with the locking portion, and stress is generated in the contact portion.

Therefore, in the capacitor according to the present invention, by extending the insulating sealing member between the lead member and the locking portion, the gap between the lead member and the locking portion is eliminated so that the dragging is performed. The rotation can be reduced, and the generated stress can be absorbed and relieved by the elastic force of the resin when the lead member rotates along with the screw and comes into contact with the locking portion. .

[0022]

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory sectional view showing a first aspect of the present embodiment, and FIG. 2 is an explanatory sectional view showing a second aspect of the present embodiment. 3 is a plan view showing a modification of the embodiment shown in FIG. 2, FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is a plan view showing another modification of the embodiment shown in FIG. FIG. 6 and FIG. 6 are sectional views taken along line VI-VI of FIG. FIG. 7 shows VII in FIG.
FIG. 7 is a sectional view taken along the line VII.

First, a first mode of the present embodiment will be described with reference to FIG.

A capacitor 1a shown in FIG. 1 includes a bottomed cylindrical outer case 2 containing a capacitor element (not shown) and an electrolyte solution, such as an electrolytic capacitor or an electric double layer capacitor. The lid is closed with an aluminum lid 3 welded to the opening end.
The electrode terminal 5 made of aluminum is inserted into the through hole 4 provided in the cover member 3, and the cover 3 and the electrode terminal 5 are integrated by a resin insulating sealing member 6 insert-molded between the cover 3 and the electrode terminal 5. It is a configuration that is formed in a typical manner. The electrode terminal 5 includes a shaft 7 inserted into the through hole 4 and the outer case 2 of the shaft 7.
An inner connecting portion 9 connected to an inner side and connecting a lead member 8 extending from a current collector (not shown) of the capacitor element; and an outer circuit connected to an outer side of the outer case 2 of the shaft portion 7 and forming an external circuit. An outer connecting portion 11 connected to the lead member 10;
And a disc-shaped flange 12 provided in parallel with the lid between the outer connecting portion 11 and the outer connecting portion 11.

The resin insulating sealing member 6 has a thickness of 0.5 to 2 mm between the through hole 4 and the shaft 7 and between the flange 12 and the lid 3.
And a resin layer of a predetermined thickness is also formed on the surface of the lid 3 on the inner surface side of the outer case 2 so that the lead member 10 of the external circuit and the lid 3 can be formed. The lid 3 and the lead member 8 are reliably insulated.

In the capacitor 1a shown in FIG. 1, the provision of the flange 12 allows the electrode terminal 5 and the resin insulating sealing member 6 to be provided.
The contact area between the electrode terminal 5 and the insulating sealing member 6 made of resin can be improved. In order to further improve the adhesive strength between the electrode terminal 5 or the lid 3 and the resin insulating sealing member 6, a surface of the electrode terminal 5 and the lid 3 is coated with a coating layer of an organometallic compound which increases the affinity with the resin. Is preferably provided. Examples of the organometallic compound include triazine thiols described in JP-B-5-51671.

In this embodiment, the cover 3 and the electrode terminal 5 on which the coating layer made of the triazine thiols is formed are assembled into a mold, and a resin is inserted between the cover 3 and the electrode terminal 5 by insert molding. Thereby, the lid 3 and the electrode terminal 5 are firmly adhered to each other via the insulating sealing member 6 made of resin, and can be integrally formed. Polyphenyl sulfide (PPS) is suitable as the resin forming the insulating sealing member 6 because it has a high affinity with the triazine thiols and excellent adhesive strength can be obtained. The resin forming the insulating sealing member 6 is made by mixing glass fibers with polyphenyl sulfide so that the coefficient of thermal expansion of the insulating sealing member 6 is close to the aluminum forming the lid 3 and the electrode terminals 5. Can be adjusted. Lid 3
Also, by approximating the coefficient of thermal expansion between the electrode terminal 5 and the insulating sealing member 6, even when the temperature cycle of high and low temperatures is repeated during use of the capacitor 1a, the insulating sealing from the lid 3 or the electrode terminal 5 is performed. The peeling of the member 6 can be prevented.

In the capacitor 1a, the lead members 8 extending from the current collector are grouped for each same pole, and are attached to the inner connection portion 9 of the electrode terminal 5 by rivet bonding or ultrasonic diffusion bonding. The lead member 10 of the external circuit connected to the capacitor 1a is a bus bar made of a metal plate such as copper or aluminum. The outer connecting portion 11 is the flange 1
2, a lead member 10 of the external circuit is connected to the protrusion 11a inserted through the through hole 10a by soldering or welding.
3 is formed.

At this time, the electrode terminal 5 is connected to the capacitor 1a.
The conventional electrode terminal 5 shown in FIG.
The heat capacity is larger, and the heat of the soldering or welding is dissipated from the flange 12 to the atmosphere or to the lid 3 via the insulating sealing member 6. Therefore, the amount of heat transmitted from the joint portion 13 to the shaft portion 7 of the electrode terminal 5 can be reduced, and deterioration such as melting and deterioration due to the heat of the insulating sealing member 6 contacting the shaft portion 7 can be prevented.

Next, a second mode of the present embodiment will be described with reference to FIG.

The second mode of the present embodiment is the outer connecting portion 1
The external circuit lead member 10 is fixedly connected to the outer connecting portion 11 by a screw which is screwed to the screw portion provided on the outer connecting portion 11. The screw portion is connected to the outer side as shown in FIG. An external thread 11b may be formed on the outer periphery of a protruding portion 11a provided on the connecting portion 11 so as to protrude outward from the flange portion 12. As shown in FIG. It may be a female screw portion 11c formed so as to be opened at the end.

The capacitor 1b shown in FIG. 2A has the same configuration as the capacitor 1b of the first embodiment except that a male screw 11b is provided on the outer periphery of the projecting portion 11a of the outer connecting portion 11.
The configuration is exactly the same as a. In the capacitor 1b, the lead member 10 of the external circuit composed of the bus bar is connected to the male screw portion 11 of the protruding portion 11a inserted through the through hole 10a.
b, a nut 15a screwed through a spring washer 14
And is connected to the outer connecting portion 11 by being clamped between the flange portion 12 and the nut 15a.

At this time, in the capacitor 1b, as described in the first embodiment, since the bonding strength between the electrode terminal 5 and the resin-made insulating sealing member 6 is improved, the electrode terminal 5 resists the rotational torque. 5 and the resin insulating sealing member 6 can be maintained in adhesion.

Further, since the lid 3 is welded to the upper end edge of the outer case 2 in the capacitor 1b, the flange X is separated from the upper position Y of the upper surface of the outer case 2 so that the position X on the upper surface of the flange 12 is separated. By providing the portion 12, the lead member 10 of the external circuit sandwiched between the upper surface of the flange portion 12 and the nut 15a can be disposed at a distance d from the position Y on the upper part of the outer case 2. . As a result, contact between the lead member 10 and the outer case 2 can be prevented.

The capacitor 1b has a flange portion 12,
Since the flat washer 22 shown in FIG.
The insulating sealing member disposed between the
a from the buckling deformation due to the rotational torque
And the cover 3 can be insulated.

The capacitor 1c shown in FIG.
Has exactly the same configuration as the capacitor 1a of the first embodiment, except that it has a female screw portion 11c opened to the outer connection portion 11. In the capacitor 1c, the bolt 15b is inserted through the washer 14 into the through hole 10a of the lead member 10 of the external circuit composed of the bus bar, and is screwed to the female screw portion 11c. The lead member 10
Is connected to the outer connecting portion 11 by being screwed by the bolt 15b and being sandwiched between the flange portion 12 and the head of the bolt 15b.

According to the capacitor 1c, the same effect as that of the capacitor 1b shown in FIG. 2A can be obtained. Therefore, the following modification will be described using the capacitor 1b as an example.

In the capacitor 1b, as shown in FIGS. 3 and 4, a bus bar (lead member of an external circuit) 10 is provided with a claw portion 16 directed toward the lid 3, and the claw portion 16 is attached to the flange portion 12. You may make it engage with the notch part 17 provided. The bus bar 10 can be positioned with respect to the capacitor 1b by locking the claw portion 16 with the notch portion 17.

When the notch 17 is provided in the flange 12, the insulating sealing member 6 is placed on the lid 3 below the notch 17.
Is extended, it is possible to prevent the bus bar 10 and the lid 3 from coming into contact with each other via the claw portion 16 locked by the notch portion 17.

In the capacitor 1b, an upright portion 6a standing upright from the insulating sealing member 6 is extended and interposed between the claw portion 16 and the notch portion 17, so that the nut 15
It is possible to reduce the entrainment of the bus bar 10 and the nut 15a when screwing a. Also, when the co-rotation occurs, the claw portion 16 of the bus bar 10 is notched 17
Can be absorbed and reduced by the elastic force of the resin.

In the capacitor 1b shown in FIGS. 3 and 4, the flange portion 12 only needs to have a structure capable of engaging the claw portion 16. Instead of the cutout portion 17, the bus bar 10 of the flange portion 12 is provided.
May be provided on the surface opposite to the recess, and a concave portion for accommodating the claw portion 16 may be provided. However, in this case, since the insulating sealing member 6 cannot be extended between the claw portion 16 and the concave portion, the insulating sealing member 6 corresponds to the standing portion 6a of the insulating sealing member 6 in order to prevent the co-rotation. It is preferable to provide such a configuration.

5 and 6 in the capacitor 1b.
As shown in FIG. 3, a projection 18 formed integrally with the lid 3 is provided on the outer surface side of the lid 3, and the projection 18 is engaged with a notch 17 provided on the flange 12. You may.
By locking the projection 18 to the notch 17, the electrode terminal 5 can be positioned with respect to the lid 3 and can be prevented from rotating. At this time, the bus bar 10 can be positioned with respect to the capacitor 1b by providing the notch 20 in the bus bar 10 and engaging the notch 20 with the projection 18.

When the projection 18 is provided on the lid 3, the projection 18 is covered with the insulating sealing member 6 so that the electrode terminal 5 or the bus bar 10 locked on the projection 18 comes into contact with the lid 3. Can be prevented.

In the capacitor 1b shown in FIGS. 5 and 6, the flange 12 only needs to have a structure capable of locking the projection 18. When the projection 18 is small, the notch 17 is used.
Alternatively, a recess may be provided on the surface of the flange portion 12 facing the lid 3 to accommodate the projection 18.

In the capacitors 1a to 1c of the present embodiment, the through hole 4 of the cover 3 and the shaft 7 of the electrode terminal 5 may have a circular cross section, but FIG. As shown, polygons such as hexagons similar to each other may be used. When the cross section of the through hole 4 and the shaft portion 7 is polygonal, the rotation of the electrode terminal 5 is easier than when the cross section is circular, and the electrode terminal 5 can be made larger. Further, by forming the cross section of the shaft portion 7 into a polygonal shape, it is possible to use the strength against the compression of the resin irrespective of the adhesive strength of the resin and the strength against the shearing force. Sealability can be improved. When the cross section of the through hole 4 and the shaft portion 7 is polygonal, the gap between the inner surface of the through hole 4 and the shaft portion 7 is set to 0 in order to effectively increase the strength against the compression of the resin. .5-
It is preferable to set the range to 2 mm.

FIG. 7 shows a case where the cross section of the through hole 4 and the shaft portion 7 is hexagonal. However, the shape of the cross section is not limited to this, and other shapes such as quadrangle, octagon, etc. May be a polygon.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a first embodiment of a capacitor according to the present invention.

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

FIG. 3 is a plan view showing a modification of the mode shown in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a plan view showing another modification of the embodiment shown in FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a sectional view taken along line VII-VII of FIG. 1;

FIG. 8 is an explanatory sectional view showing one mode of a conventional capacitor.

FIG. 9 is an explanatory sectional view showing another embodiment of the conventional capacitor.

[Explanation of symbols]

1a, 1b: capacitor, 2: exterior case, 3: lid, 4: through hole, 5: electrode terminal, 6: insulating sealing member, 7: shaft portion, 8: lead member, 9: inside connection portion, 10 ... Lead member of external circuit, 11 ... outside connection part, 11b, 11c ... thread part, 12 ... flange part, 15
a, 15b: Screw, 17: Locking part.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroto Kobayashi 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Research Institute, Inc. (72) Inventor Yasuhiro Matsumoto 1-4-1 Chuo, Wako-shi, Saitama No. Within Honda R & D Co., Ltd. (72) Inventor Tsuyoshi Taguchi 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside of Honda R & D Co., Ltd. (72) Mitsuru Ikeo 1-4-1 Chuo, Wako-shi, Saitama Pref. No. In Honda R & D Co., Ltd.

Claims (5)

[Claims] 1. A bottomed cylindrical outer case for containing a capacitor element and an electrolyte solution, a metal lid for closing the outer case, and an electrode terminal inserted into a through hole provided in the lid. And a resin insulating sealing member insert-molded between the lid and the electrode terminal inserted through the through-hole to integrally mold the lid and the electrode terminal. A terminal connected to a shaft portion inserted through the through-hole, an inner connection portion connected to the inside of the outer case of the shaft portion and connecting a lead member extending from the current collector of the capacitor element; And an outer connecting portion connected to an external circuit and connected to an external circuit, and a flange provided on the outer connecting portion in parallel with the lid, and inserted through the lid and the through hole. The resin insulating sealing member that is insert-molded between the At least the capacitor is provided between the inner surface of the through hole and the shaft portion and between the flange portion and the lid. 2. The outside connection portion includes a protrusion protruding outward from the flange, and is connected to the lead member by soldering or welding a lead member of the external circuit to the protrusion. The capacitor according to claim 1, wherein 3. The external connection portion has a thread portion, and a lead member of the external circuit is fixed to the flange portion by a screw screwed to the thread portion, and is connected to the lead member. The capacitor according to claim 1, wherein 4. When the outer connection portion is fixedly connected to a lead member of the external circuit by a screw screwed to the screw portion, the flange portion is connected to a lead member of the external circuit. 4. The capacitor according to claim 3, further comprising: a locking portion for locking the sealing member, wherein the insulating sealing member is disposed between the locking portion and the lid. 5. The insulating sealing member extends between the lead member and the locking portion when the lead member of the external circuit is locked by the locking portion provided on the flange portion. The capacitor according to claim 4, wherein: