WO2012105496A1

WO2012105496A1 - Film capacitor

Info

Publication number: WO2012105496A1
Application number: PCT/JP2012/051990
Authority: WO
Inventors: 一義小又; 山口　清治
Original assignee: 日立エーアイシー株式会社
Priority date: 2011-02-01
Filing date: 2012-01-30
Publication date: 2012-08-09
Also published as: CN103339699B; CN103339699A

Abstract

The purpose of the present invention is to provide a storage structure capable of maintaining a small size, light weight, moisture resistance, and pressure resistance in order to obtain a high-capacity capacitor having a plurality of capacitor elements using a metal film provided with vapor deposited metal electrodes on the surface of a dielectric film. A film capacitor is provided in which a plurality of capacitor elements comprising metallikon electrodes on both ends are accommodated in a cylindrical case and arranged in parallel, both ends of the cylindrical case being open. The capacitor elements are connected in parallel by external lead-out terminals. Both end portions of the cylindrical case are covered by a pair of concave terminal covers such that both end portions are covered together. The interior of the concave terminal covers is filled with an insulating resin. Notches or through-holes into which the insulating resin is filled are provided on at least one end surface of the cylindrical case.

Description

Film capacitor

The present invention relates to a film capacitor. In particular, the present invention relates to a film capacitor using a plurality of capacitor elements.

A film capacitor is formed by depositing aluminum or zinc on a dielectric film such as PP (polypropylene), PET (polyethylene terephthalate) or PS (polystyrene) to form an electrode, and laminating or winding this to form a capacitor element. Or the aluminum foil electrode was laminated | stacked or wound with the film, and the capacitor | condenser element was comprised. In the case of vapor-deposited metal, a metallicon electrode formed by metal spraying is applied to both ends of the capacitor element thus formed, a lead wire is welded or soldered to the metallicon electrode, and a terminal fitting is attached to the tip of the lead wire. The insulating resin was poured into the container, and the insulating resin was filled in the capacitor element and the lead wire portion.

In addition, large-capacity film capacitors used for vehicles, rolling mills, industrial equipment such as DC power transmission, power factor improvement, etc. use a plurality of capacitor elements, and externally extract the metallicon electrodes on the end faces of these capacitor elements. After being connected in parallel with terminals and housed in a container having an open top surface, the container was filled with an insulating resin.

Further, in order to obtain a small size and light weight by eliminating the above-described container and reducing the insulating resin filled in the container, Patent Document 1 discloses that an insulating adhesive resin tape is wound around the outer peripheral portion of the capacitor element or After covering with a heat shrink resin tube, connect it in parallel, connect it in parallel with the external lead terminal, and then insulate the inside of the concave terminal cover with insulating resin so that both ends of the capacitor element are hidden together with a pair of concave terminal covers In order to fill and maintain a gap between the pair of concave terminal covers, a film capacitor is described which is provided with a pair of insulating plates on both ends of the concave terminal cover to form a column.

JP 2001-76966 A

In order to manufacture a large-capacity capacitor having a plurality of capacitor elements in a small size and a light weight, an insulating adhesive resin tape is wound around the outer periphery of the side surface of the capacitor element as in Patent Document 1, or a heat shrink resin tube is provided. With this structure, the capacitor element expands and contracts depending on the environment used at a high temperature and a low temperature, and the adhesive resin tape is displaced to reduce the adhesive force. Therefore, the moisture resistance tends to be reduced. In addition, in the case of heat shrink resin tubes, if the thickness of the heat shrink resin tube is increased in order to improve moisture resistance, the capacitor element may be tightened more than necessary due to heat shrink, and the electrode spacing in the capacitor element may be increased. In some cases, the insulation resistance deteriorates due to pressure reduction or, in some cases, folding.
Further, as in Patent Document 1, in order to maintain a distance between a pair of concave terminal covers, when a pair of insulating plates are provided at both ends of the concave terminal cover to form a support, a support is provided at both ends as a capacitor. Since there is only a small, there is a structural restriction in strength, and it is difficult to increase the size.

As a solution to the problem, in providing a large-capacity capacitor having a plurality of capacitor elements in a small size and light weight, it is an object to provide a film capacitor excellent in moisture resistance, insulation resistance and strength.

In order to solve the above problems, the present invention provides the following film capacitor.
(1) A plurality of capacitor elements provided with metallicon electrodes at both ends are accommodated in a cylindrical case with both ends open and arranged in parallel, and the metallicon electrodes are connected in parallel with external lead terminals, and both end portions of the cylindrical case A film capacitor that is covered with a pair of concave terminal covers so as to cover them together and filled with an insulating resin inside the concave terminal cover.
(2) A plurality of capacitor elements provided with metallicon electrodes at both ends are accommodated in a cylindrical case with both ends open and arranged in parallel, and the metallicon electrodes are connected in parallel with external lead terminals, and both ends of the cylindrical case A film capacitor that is covered with a pair of concave terminal covers so as to be covered together and filled with an insulating resin inside the concave terminal cover and inside the cylindrical case.
(3) The film capacitor according to the above (1) or (2), having fixing means provided on the concave terminal cover for fixing the cylindrical case to the concave terminal cover.
(4) The film capacitor according to (2), wherein a notch or a through hole filled with an insulating resin is provided on at least one side of the side surface of the end portion of the cylindrical case.
(5) The film capacitor according to (4), wherein the notch or the through-hole has a narrower opening toward the center side in the length direction of the cylindrical case.

The structure of the present invention can provide a film capacitor excellent in moisture resistance, insulation resistance and strength in providing a large-capacity capacitor having a plurality of capacitor elements in a small size and light weight.

It is sectional drawing of the longitudinal direction of the capacitor | condenser shown in the 1st Embodiment of this invention. It is sectional drawing of the longitudinal direction of another capacitor | condenser shown in the 1st Embodiment of this invention. It is sectional drawing of the width direction of the capacitor | condenser shown in the 1st Embodiment of this invention. It is sectional drawing of the width direction of the capacitor | condenser shown in the 2nd Embodiment of this invention, and a perspective view which shows the cylindrical case. It is a perspective view which shows another cylindrical case of the capacitor | condenser shown in the 2nd Embodiment of this invention. It is a figure which shows the example of the manufacturing method of this invention.

In the capacitor element described in the present invention, a set of metallized films in which a metal vapor deposition electrode is provided on the surface of a dielectric film such as PP (polypropylene), PET (polyethylene terephthalate), PS (polystyrene), etc., the metal surfaces do not overlap. In this way, two metal sheets are alternately stacked and wound, and metallized electrodes are formed on the wound ends by a method such as thermal spraying of a metal such as zinc.

A metallicon electrode generally used for a film capacitor can be used, and is made of a metal or an alloy such as copper, zinc, aluminum, tin, or solder, and is formed by thermal spraying. In some cases, the surface of the metallicon electrode may be plated.
In addition to a capacitor element in which two metallized films with metallized vapor deposition electrodes formed on one side of a dielectric are rolled and wound, the present invention is not limited to this, but metallization with metal vapor deposition electrodes formed on both sides It may be a capacitor element produced by stacking and winding a film and a dielectric film on which no metal vapor deposition electrode is formed.

The cylindrical case described in the present invention is a cylindrical body that is open at both ends, and accommodates a capacitor element therein and protects it in terms of weather resistance and strength.

It should be noted that a cutout portion or a through hole filled with the following insulating resin may be provided on at least one side of the side surface of the end portion of the cylindrical case.

When a notch or a through hole is provided, the notch or the through hole provided in the cylindrical case is provided on the side surface of the end of the cylindrical case as a means for passing the insulating resin shown below. . The shape is formed of a notch or a through hole, and is hidden by an insulating resin filling the inside of the concave terminal cover shown below. By doing so, the insulating resin is also filled in the insulating resin inlet. It is preferable that the number of notches or through-holes is so large that the strength of the cylindrical case does not decrease, because the insulating resin easily enters the cylindrical case.

The width of the notch or the diameter of the through hole is increased or decreased according to the diameter of the cylindrical case, which is about 1 mm to 20 mm.
Moreover, it is preferable that the shape of the notch or the through hole has a narrow opening toward the center in the length direction of the cylindrical case. By doing so, when filling the inside of the concave terminal cover with insulating resin, the filling speed can be increased at the beginning of the gap in the cylindrical case, and the front end toward the center side in the length direction of the cylindrical case Therefore, after filling with insulating resin, it is easy to block moisture entering from the filling surface in a high humidity environment.

The capacitor element to be accommodated is accommodated so that both ends provided with the metallicon electrodes are the open ends of the cylindrical case. The gap between the cylindrical case and the capacitor element after the housing is preferably as narrow as possible in terms of heat transfer.

As the material of the cylindrical case, resin molded products such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PPE (polyphenylene ether) PBT (polybutylene terephthalate), POM (polyoxymethylene), PPO (polyphenyl oxide), etc. Or a vacuum resin molded product such as polyvinyl chloride or polycarbonate, a metal such as aluminum, iron or stainless steel, or a laminate of resin and metal. You don't have to worry about this. However, the adhesion at the resin / resin interface is often greater than the adhesion at the metal / resin interface, and in this respect, a resin molded product is preferable. Moreover, in the case of a fat molded product, you may reinforce with fillers, such as glass fiber. In the case of a laminate of a resin and a metal or a metal, it is necessary to have a structure in which the metal portion does not contact the metallicon electrode or the external lead terminal. The thickness is 0.3 mm to 10 mm, preferably about 1 mm to 5 mm for a resin-based material, and 0.2 mm to 5 mm, preferably about 0.3 to 3 mm for a metal-based material. Getting worse. If it is thick, the heat dissipation / cooling performance or small size / lightness of the capacitor element will deteriorate.

Also, in order to improve heat dissipation and cooling properties, an uneven surface may be provided on the external surface, or a material with good heat dissipation may be provided on the external surface. As a material with good heat dissipation, a radiation type is preferable to a conduction type.

The concave terminal cover described in the present invention covers both ends so that the end portion of the cylindrical case containing the capacitor elements is hidden. The cylindrical cases each containing a plurality of capacitor elements are arranged in parallel, Connect in parallel at the lead-out terminals and cover both ends so that both ends of the cylindrical case are hidden together.

Materials include resin molded products such as PET (polyethylene terephthalate), PPS (polyphenylene sulfide), PPE (polyphenylene ether) PBT (polybutylene terephthalate), POM (polyoxymethylene), PPO (polyphenyl oxide), or polychlorinated. Vacuum resin molded products such as vinyl and polycarbonate, such as aluminum, iron and stainless steel, or a laminate of resin and metal. You don't have to worry about this. Moreover, you may reinforce with fillers, such as glass fiber. In the case of a laminate of a resin and a metal or a metal, it is necessary to have a structure in which the metal portion does not contact the metallicon electrode or the external lead terminal.

The external lead terminal described in the present invention is connected to the metallicon electrode of the capacitor element at one end and connected to the outside of the capacitor at the other end, and can be deformed such as a metal foil, thin plate, or wire, solder connection, welding Anything that can be pressed can be used without limitation.

In the case of a thin plate, compared to a linear lead wire that can be bent in any direction, a foil-shaped metal plate is easy to bend in the thickness direction, but is difficult to deform in the width direction, and it is easy to fix the position in a bent state. Therefore, the external lead terminal does not fluctuate and the external lead terminals having different potentials do not cross each other. Moreover, the allowable current value itself is higher for the foil-shaped terminal than for the lead wire terminal. Further, unlike a lead wire having a round cross section, the thickness of a foil-like metal plate is small, so that the thickness of a soldered portion can be reduced, which is advantageous for downsizing of a capacitor.

The insulating resin described in the present invention is an insulating resin for filling the inner side of the concave terminal cover or the inner side of the cylindrical case, and examples thereof include insulating epoxy, urethane, and silicon resin. Good. Moreover, what mixed the filler etc. in the said resin is also preferable. As the filler, hydroxides such as silicon, titanium, aluminum, calcium, zirconium, and magnesium, oxides, carbides, nitrides, and composites thereof can be used. If necessary, a flame retardant and an antioxidant may be added. In particular, it is preferable that the heat dissipation is large.

The insulating resin is filled in the inside of the concave terminal cover or in addition to the inside of the cylindrical case. When filling the inside of the concave terminal cover, it also includes a gap portion in the cylindrical case up to the same filling surface as the filling surface inside the concave terminal cover. Moreover, when filling the inside of a cylindrical case, the case where all the space | gap parts in the cylindrical case are filled with an insulating resin is also included.
Accordingly, it is preferable that the metallicon electrode part and the external lead terminal part in the vicinity thereof are covered with an insulating resin.

The cylindrical case is fixed by fixing the concave terminal cover with a convex portion along the outer circumference of the cylindrical case, or by attaching a concave groove along the outer dimension of the cylindrical case. Means are mentioned.

Even if the cylindrical case does not directly contact the concave terminal cover, the cylindrical case and the capacitor element accommodated therein are fixed by filling the cylindrical case with an insulating resin inside or in addition to the concave terminal cover. be able to. Moreover, when a collar is provided on the outer side surface of the end of the cylindrical case, it becomes a wedge shape, and the cylindrical case can be more strongly fixed to the insulating resin filled. Moreover, since the thickness of the cylindrical case is increased by the flange portion, it is possible to fix the screw from the concave terminal cover side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 shows a longitudinal sectional view of a capacitor showing one embodiment of the present invention. In FIG. 1, three capacitor elements 2 each provided with a metallicon electrode 1 at both ends are arranged side by side in parallel. Each capacitor element 2 has a cylindrical case 3 with both ends open, and the metallicon electrode 1 is opened. Each is accommodated so as to be exposed at both ends.
Further, the metallicon electrodes 1 are connected in parallel by the external lead terminals 4 separately on the upper and lower sides.
The external lead terminals 4 are connected between the capacitor elements 2 by recesses 5 provided on both side surfaces of the cylindrical case 3 so that the capacitor elements 2 can be easily connected to each other and the metallized electrode 1 can be easily connected. is doing.
The upper and lower open ends of the cylindrical case 3 are collectively covered with a pair of concave terminal covers 6 so that the concave side faces inward, and the inner side of the concave terminal cover 6 is filled with an insulating resin 7. .
In FIG. 1A, the filling range of the concave terminal cover 6 is such that the inside of the concave terminal cover 6 and the gap in the cylindrical case 3 up to the filling surface as much as the filling surface inside the concave terminal cover 6 are filled. In FIG. 1B, the inside of the concave terminal cover 6 and the gap portion in the cylindrical case 3 are filled. The inside of the cylindrical case 3 is filled with the insulating resin 7 by the dent portions 5 provided on the side surfaces of both ends of the cylindrical case 3, and is cured and solidified by heating or the like.

FIG. 2 is a cross-sectional view in the longitudinal direction of the capacitor showing the embodiment of the present invention. The difference from FIG. 1 is that a column 8 is additionally provided between the concave terminal covers 6 in the components shown in FIG.
The support column 8 is provided between the capacitor elements 2 or around the capacitor. In addition, it is preferable in terms of fixing that the support column 8 is screwed with a screw 9 or the like from the concave terminal cover 6 side. The support 8 can help to temporarily fix the shape of the capacitor until the liquid insulating resin 7 is solidified. Further, after the liquid insulating resin 7 is solidified, the shape of the capacitor can be useful for maintaining the strength. However, if the support column 8 is increased more than necessary, the shape of the capacitor is increased correspondingly, and the gap between the cylindrical cases 3 is reduced, which is not preferable in terms of heat dissipation.

FIG. 3 is a cross-sectional view in the width direction of the capacitor showing the embodiment of the present invention. FIG. 3 shows a cross-sectional view perpendicular to the direction of FIG.
3A shows a method of fitting into the concave groove 10, FIG. 3B shows a method of fitting into the convex portion 11, and FIG. 3C shows a method of providing a raised bottom. Insulating resin 7 to be filled is omitted.

3 (a) is a method of fitting the cylindrical case 3 by providing the concave terminal cover 6 with the concave groove 10, and the part to be fitted may be the whole circumference or a partial part. Partially, it is easier to obtain the strength of the concave terminal cover 6.

3 (b) is a method of fitting the concave terminal cover 6 with the convex portion 11 along the outer periphery of the dimension of the cylindrical case 3. The convex part 11 may be partial in addition to the entire circumference. 3A or 3B, when the end portion of the cylindrical case 3 contacts the concave terminal cover 6, both side surfaces of the cylindrical case 3 are arranged so that the external lead terminal 4 can be easily routed. It is preferable to provide a space such as a recess 5 through which the external lead terminal 4 passes.

3 (c) is the same as the method shown in FIG. 3 (b), in which the cylindrical case 3 is provided with a raised bottom portion 12 so that the end of the cylindrical case 3 contacts the raised bottom portion 12. It is not necessary to provide a space such as a recessed portion 5 through which the external lead terminal 4 passes on both side surfaces of the cylindrical case 3, which is preferable.

Since the manufacturing method of the present invention is common to the second embodiment except for the following part, it will be described later with reference to FIG.

The present embodiment is different from the manufacturing method shown in the second embodiment in that the notched portion 13b is not provided.
<Second Embodiment>
FIG. 4 shows a cross-sectional view of the capacitor in the width direction and a perspective view of the cylindrical case 3 showing the second embodiment of the present invention. The left figure shows a sectional view of the capacitor, and the right figure shows a perspective view in which the cylindrical case 3 of the capacitor is extracted and rotated 90 degrees in the length axis direction. 4A shows a case where a notch 13 is provided at the end of the cylindrical case 3, and FIG. 4B shows a case where a through hole 14 is provided at the end of the cylindrical case 3. As shown in FIG.
4 (a) or 4 (b) may be provided with a plurality of recesses 5 as appropriate in the cylindrical case 3, but in this figure, only one location is arbitrarily shown. Yes.

In FIG. 4, the capacitor element 2 provided with the metallicon electrodes 1 at both ends is accommodated in a cylindrical case 3 with both ends open so that the metallicon electrodes 1 are exposed at both open ends.
In addition, the metallicon electrode 1 is connected to the upper and lower terminals by external lead terminals 4 separately.
The external lead terminal 4 is provided with a recessed portion 5 on the side surface of the end portion of the cylindrical case 3 so that it can be easily led out from the cylindrical case 3.
The drawing direction of the external lead terminal 4 is different from that shown in FIG. 1 or FIG. 2 and is drawn in the width direction instead of the length direction of the capacitor.

Although not shown in FIG. 4, the sets of the capacitor element 2 and the cylindrical case 3 are arranged in parallel on the back side and the front side in the same manner, and are connected to the upper and lower sides separately by the external lead terminals 4. It is summarized in.
The upper and lower open ends of the cylindrical case 3 are collectively covered with a pair of concave terminal covers 6 so that the concave side faces inward, and the inner side of the concave terminal cover 6 is filled with an insulating resin 7. .

In FIG. 4, the filling portion of the insulating resin 7 inside the cylindrical case 3 is the gap portion in the cylindrical case 3 from the inner side of the concave terminal cover 6 to the same filling surface as the inner filling surface of the concave terminal cover 6. However, it is preferable in terms of moisture resistance and strength that the gap between the capacitor element 2 and the cylindrical case 3 in the cylindrical case 3 is also filled.
4A, a notch 13 is provided at the lower end of the cylindrical case 3, and a through hole 14 is provided at the lower end side of the cylindrical case 3 in FIG. 4B. . The insulating resin 7 is easily filled into the cylindrical case 3 by the notch 13 or the through hole 14.

In addition, since one side of the cylindrical case 3 is opened on the side of the concave terminal cover 6a that is filled with resin first, the cutout portion 13 and the through hole 14 are not necessarily provided in the structure of the cylindrical case 3. However, if the concave terminal cover 6a side is thermoset by resin filling and then inverted 180 degrees, and the other concave terminal cover 6b is covered with the cylindrical case 3, the cylindrical case 3 is hermetically sealed. Therefore, the replacement of the internal air and the insulating resin 7 is not easy. In that case, the notch part 13 and the through hole 14 provided in the cylindrical case 3 play a role as exhaust passage in the sealed space and a passage for injecting the insulating resin 7. Therefore, vacuum injection is preferable on the concave terminal cover 6b side to be filled with resin later.

FIG. 5 shows another cylindrical case 3 of the capacitor showing the embodiment of the present invention. FIG. 5A shows a cylindrical case 3 provided with a notch 3 having a triangular cross-section, and FIG. 5B shows a through-hole 14 with a circular cross-section having a different diameter. When the notch 13 is a rectangular parallelepiped as in the case of FIG. 4A, the cutting process is performed by a mold. However, as in the case of the right of FIG. In addition, cutting with a blade or drilling can be performed in the through hole 14 to easily cope with dimensional changes.
In both cases, the notch 13 or the through hole 14 provided at the end of the cylindrical case 3 has a narrow opening toward the central portion in the length direction of the cylindrical case 3.

With this structure, since the opening of the insulating resin 7 becomes wider toward the end portion in the length direction of the cylindrical case 3, the initial filling speed is high in the gap portion in the cylindrical case 3, and the cylindrical case 3 Since the frontage becomes narrower toward the central portion in the length direction, it is easy to block moisture entering from the filling surface in a high humidity environment after filling with the insulating resin 7.
5 may be provided as appropriate in the cylindrical case 3, but in this figure, only one location is arbitrarily shown.

FIG. 6 shows an example of the manufacturing method of the present invention.
First, as shown in FIG. 6A, three capacitor elements 2 provided with metallicon electrodes 1 at both ends are arranged side by side in parallel.
Next, as shown in FIG.6 (b), the

notch parts

13a and 13b are provided in the both ends of the cylindrical case 3 which both ends opened, respectively. Next, each capacitor element 2 is accommodated in the cylindrical case 3 so that the metallicon electrode 1 is exposed at both open ends. Next, the metallicon electrodes 1 are connected in parallel by the

external lead terminals

4a and 4b separately on the upper and lower sides.
Next, as shown in FIG. 6C, the lower open end of the cylindrical case 3 is collectively covered with the concave terminal cover 6a so that the concave side faces inward.
Next, the inside of the concave terminal cover 6a is filled with the insulating resin 7 so that the notch 13a is hidden, and the insulating resin 7 is cured. Next, it is rotated 180 degrees so that the concave terminal cover 6a is on the upper side.
Next, as shown in FIG. 6 (d), the lower open end of the cylindrical case 3 is collectively covered with the concave terminal cover 6b so that the concave side faces inward.
Next, the inside of the concave terminal cover 6b is filled with the insulating resin 7 so that the notch 13b is hidden, and the insulating resin 7 is cured.

A capacitor with a rated voltage of 1100 V and a capacitance of 1600 μF was produced.

The capacitor element has a diameter of a single-sided metallized film with a metal-deposited electrode on the surface of a 5 μm thick polypropylene film dielectric film and a similar metallized film that are stacked in layers so that the metal surfaces do not overlap. Was wound to be 100.5 mm, and 0.6 mm thick metallicon electrodes were formed by thermal spraying of zinc metal on both ends of the wound.

Next, three capacitor elements of the same shape are arranged side by side in parallel, and the metallicon electrodes are exposed at the open ends of the cylindrical case made of polyphenyl oxide having an inner diameter of 102 mm and a thickness of 2 mm with both ends of the capacitor elements open. So that each was housed.

Next, the metallicon electrodes were connected in parallel by external lead terminals that were tin-plated on a copper foil having a thickness of 200 μm and a width of 29 mm separately on the upper and lower sides.

Next, the lower open end of the cylindrical case was covered with a concave terminal cover made of polyphenylene ether having a thickness of 3.5 mm and a depth of 21.5 mm so that the concave side faces inward.
Next, the inside of the concave terminal cover is filled with an insulating urethane resin so that the notch is hidden, and the resin is thermoset. Next, it is rotated 180 degrees so that the concave terminal cover is on the upper side.
Next, it is rotated 180 degrees so that the concave terminal cover is on the upper side. Next, the lower open end of the cylindrical case was collectively covered with a concave terminal cover so that the concave side faced inward.
Next, the inside of the concave terminal cover is filled with an insulating urethane resin, and the resin is thermoset. In filling the insulating resin, vacuum defoaming and vacuum injection treatment were performed.

Prepare a cylindrical case made of polyphenyl oxide with an inner diameter of 102 mm and a thickness of 2 mm with both ends open, and cut out the four cuts at each of the four ends of the tube into a triangle with a base width of 10 mm and a height of 10 mm. In addition, when filling with an insulating resin, the inside of the concave terminal cover was filled with an insulating urethane resin so that the notch was hidden, and the resin was thermally cured, and the same procedure as in Example 1 was performed.

The inside of the concave terminal cover was filled with an insulating urethane resin, and after curing the resin, the cylindrical case was fully filled with the same insulating urethane resin and cured in the same manner as in Example 1 except that the resin was cured. .

As described above, the structure of the present invention can provide a film capacitor excellent in moisture resistance, insulation resistance and strength in a large-capacity capacitor having a plurality of capacitor elements.

Therefore, the present invention can be used for a large-capacity film capacitor using a plurality of capacitor elements used for industrial equipment such as vehicles, rolling mills, DC power transmission, and power factor improvement, etc. It can also be applied to industrial fields that require small size and light weight.

DESCRIPTION OF SYMBOLS 1 ... Metallicon electrode, 2 ... Capacitor element, 3 ...

Cylindrical case

4, 4a, 4b ... External extraction terminal, 5 ... Recessed part, 6, 6a, 6b ... Concave terminal cover, 7 ... Insulating resin, 8 ... Support | pillar, DESCRIPTION OF SYMBOLS 9 ... Screw, 10 ... Groove, 11 ... Convex part, 12 ... Raised bottom part, 13, 13a, 13b ... Notch part, 14 ... Through-hole.

Claims

A plurality of capacitor elements provided with metallicon electrodes at both ends are respectively accommodated in a cylindrical case opened at both ends and arranged in parallel, and the metallicon electrodes are connected in parallel with external lead terminals, and both end portions of the cylindrical case are connected. A film capacitor in which a cover is covered with a pair of concave terminal covers so as to cover each, and the inside of the concave terminal cover is filled with an insulating resin.
A plurality of capacitor elements provided with metallicon electrodes at both ends are respectively accommodated in a cylindrical case opened at both ends and arranged in parallel, and the metallicon electrodes are connected in parallel with external lead terminals, and both end portions of the cylindrical case are A film capacitor that is covered with a pair of concave terminal covers so as to be covered together and filled with an insulating resin inside the concave terminal cover and inside the cylindrical case.
3. The film capacitor according to claim 1, further comprising a fixing means provided on the concave terminal cover for fixing the cylindrical case to the concave terminal cover.
The film capacitor according to claim 2, wherein a cutout portion or a through hole filled with the insulating resin is provided on at least one side of the side surface of the end portion of the cylindrical case.
The film capacitor according to claim 4, wherein the notch or the through hole has a narrow opening toward the center in the longitudinal direction of the cylindrical case.