JP7122657B2 - capacitor - Google Patents

Description

The present invention relates to capacitors.

An electric element such as a capacitor element is housed in a case, the case is filled with a resin such as epoxy resin, and a terminal connected to the electric element is provided. A resin-encapsulated electrical component that is led out is described in Patent Document 1. In this resin-encapsulated electrical component, the base end of the terminal is connected to the electrical element, and the terminal base extending from the base end extends toward the opening side of the case while closely facing the inner wall of the case, Leads out from the case and reaches the tip.

In the resin-encapsulated electrical component of Patent Document 1, there is concern that the resin filled in the case may leak out of the case due to capillary action, creeping up through the gap between the terminal base of the terminal and the inner wall of the case. .

Therefore, a plate-shaped bus bar connected to the electrodes of the capacitor element is provided, and the bus bar extends toward the opening side of the case so that its surface faces the inner wall of the case, and extends outward from the case from the opening. In order to prevent the filling resin from leaking from the case due to the filling resin creeping up in the capacitor led out with Japanese Laid-Open Patent Publication No. 2002-100000 describes a wide first barrier extending from the open end of the case.

JP 2010-056120 A WO2018/051656

In the capacitor disclosed in Patent Literature 1, if the bus bar has a shape that extends beyond the side wall of the case after being extended from the opening of the case, the first barrier may become an obstacle.

Therefore, when various bus bar shapes are taken into consideration, it is desirable to realize a capacitor that can prevent the filling resin from leaking out of the case due to the filling resin creeping up, with a configuration different from that of the capacitor of Patent Document 1. .

In view of such problems, an object of the present invention is to provide a capacitor capable of preventing leakage of filling resin from the case.

A primary aspect of the present invention relates to capacitors. A capacitor according to this aspect includes a capacitor element, a plate-shaped bus bar connected to electrodes of the capacitor element, a case in which the capacitor element is accommodated, and a filling resin filled in the case. The bus bar extends toward the opening side of the case with its surface facing the inner surface of the side wall of the case, and is led out of the case through the opening. A side wall of the case opposed to the bus bar includes an outwardly bulging portion extending from a position midway from the bottom wall side of the case to the opening side to the opening. The distance between the surface of the bus bar and the inner surface of the side wall is larger at the bulging portion than at the portion from the bottom wall side to the bulging portion.

ADVANTAGE OF THE INVENTION According to this invention, the capacitor which can prevent the leakage of filling resin from a case can be provided.

The effects and significance of the present invention will become clearer from the description of the embodiments shown below. However, the embodiment shown below is merely an example of carrying out the present invention, and the present invention is not limited to the embodiments described below.

FIG. 1 is a perspective view of a film capacitor according to an embodiment. FIG. 2 is a perspective view of a capacitor element unit according to the embodiment. FIGS. 3(a) and 3(b) are perspective views of the first busbar viewed from the front and rear, respectively, according to the embodiment. FIGS. 4(a) and 4(b) are perspective views of the second busbar viewed from the front and rear, respectively, according to the embodiment. 5(a) and 5(b) are perspective views of the case viewed from the front and rear, respectively, according to the embodiment. FIG. 6(a) is a cross-sectional view of the film capacitor cut along line AA' in FIG. 1 according to the embodiment, and FIG. 6(b) is FIG. 6(a) according to the embodiment. 1 is a cross-sectional view of the film capacitor cut along line BB' of FIG.

A film capacitor 1, which is one embodiment of the capacitor of the present invention, will be described below with reference to the drawings. For convenience, front-rear, left-right, and up-down directions are indicated in each figure as appropriate. It should be noted that the illustrated directions only indicate relative directions of the film capacitor 1, and do not indicate absolute directions.

In this embodiment, the film capacitor 1 corresponds to the "capacitor" described in the claims. Also, the front side wall 202 and the rear side wall 203 correspond to the "side wall" described in the claims. Furthermore, the front bulging portion 210 and the rear bulging portion 220 correspond to the "bulging portion" described in the claims. Furthermore, the first edge electrode 410 and the second edge electrode 420 correspond to the "electrode" described in the claims. Furthermore, the first busbar 500 and the second busbar 600 correspond to the "busbar" described in the claims.

However, the above description is only for the purpose of associating the structure of the scope of claims with the structure of the embodiment, and the above correspondence allows the invention described in the scope of claims to correspond to the structure of the embodiment. It is not limited at all.

FIG. 1 is a perspective view of a film capacitor 1. FIG.

A film capacitor 1 includes a capacitor element unit 100 , a case 200 and a filling resin 300 . Capacitor element unit 100 is housed in case 200 , and case 200 is filled with filling resin 300 . Filling resin 300 is a thermosetting resin, such as an epoxy resin. Most of capacitor element unit 100 buried in filling resin 300 is protected from moisture and impact by case 200 and filling resin 300 .

FIG. 2 is a perspective view of the capacitor element unit 100. FIG. FIGS. 3A and 3B are perspective views of first bus bar 500 viewed from the front and rear, respectively. FIGS. 4(a) and 4(b) are perspective views of second bus bar 600 viewed from the front and rear, respectively.

Capacitor element unit 100 includes six capacitor elements 400 , a first busbar 500 , a second busbar 600 , a first insulating sheet 700 and a second insulating sheet 800 .

Capacitor element 400 is formed by stacking two metallized films in which aluminum is vapor-deposited on a dielectric film, winding or stacking the stacked metallized films, and pressing them flat. The capacitor element 400 has a first end surface electrode 410 formed on one end surface by spraying a metal such as zinc, and a second end surface electrode 420 formed on the other end surface by similarly spraying a metal such as zinc. be. The six capacitor elements 400 are arranged in two front and rear rows with both end faces facing up and down, with three rows in each row. is connected.

Note that the capacitor element 400 of the present embodiment is formed of a metallized film in which aluminum is vapor-deposited on a dielectric film. It may be formed by a film. Alternatively, capacitor element 400 may be formed of a metallized film obtained by vapor-depositing a plurality of these metals, or may be formed of a metallized film obtained by vapor-depositing an alloy of these metals. .

The first bus bar 500 is formed by appropriately cutting out and bending a conductive material such as a copper plate. , and the first rear connection terminal portion 540 are integrated.

The first electrode terminal portion 510 has a substantially rectangular shape and covers the first end surface electrodes 410 of the six capacitor elements 400 from above. In the first electrode terminal portion 510, first electrode pins 512 are formed at the front edges of eight openings 511 arranged in two rows in the front and rear directions in the left-right direction. In addition, two first electrode pins 512 are formed at the left end of the first electrode terminal portion 510, and two first electrode pins 512 are formed at the right end thereof. Two first electrode pins 512 are in contact with the first end surface electrodes 410 of each capacitor element 400, and these first electrode pins 512 are joined to the first end surface electrodes 410 by a joining method such as soldering. Thereby, first bus bar 500 is electrically connected to first end surface electrodes 410 of six capacitor elements 400 . In addition, two circular communication holes 513 and two square communication holes 514 are formed in the first electrode terminal portion 510 . No capacitor element 400 exists under each of the flow holes 513 and 514 . A portion of the communication hole 514 overlaps the first front relay terminal portion 530 .

A first front relay terminal portion 530 relays between the first electrode terminal portion 510 and the three first front connection terminal portions 520 . The first front relay terminal portion 530 extends upward from the front end portion of the first electrode terminal portion 510, then bends to extend forward, and further bends to extend downward. The three first front connection terminal portions 520 are provided at the lower end portion of the first front relay terminal portion 530 so as to be arranged in the horizontal direction at equal intervals. The first front connection terminal portion 520 has a hook shape that extends slightly downward and then bends and extends forward. A circular through hole 521 is formed at the tip of the first front connection terminal portion 520 .

The first rear connection terminal portion 540 is provided at the rear end portion of the first electrode terminal portion 510 . The first rear connection terminal portion 540 extends upward, bends and extends rearward, further bends and extends downward, and then bends and extends rearward. A circular through hole 541 is formed at the tip of the first rear connection terminal portion 540 .

The second bus bar 600 is formed by appropriately cutting out and bending a conductive material such as a copper plate. , the second rear connection terminal portion 640 and the second rear relay terminal portion 650 are integrated.

The second electrode terminal portion 610 has a substantially rectangular shape and covers the second end face electrodes 420 of the six capacitor elements 400 from below. In the second electrode terminal portion 610, second electrode pins 612 are formed at the front edges of eight openings 611 arranged in two rows in the front and rear directions in the left-right direction. In addition, two second electrode pins 612 are formed on the left end of the second electrode terminal portion 610, and two second electrode pins 612 are formed on the right end thereof. Two second electrode pins 612 are in contact with the second end surface electrodes 420 of each capacitor element 400, and these second electrode pins 612 are joined to the second end surface electrodes 420 by a joining method such as soldering. Thereby, second bus bar 600 is electrically connected to second end face electrodes 420 of six capacitor elements 400 . Two circular flow holes 613 are formed in the second electrode terminal portion 610 . No capacitor element 400 exists under each flow hole 613 .

A second front relay terminal portion 630 relays between the second electrode terminal portion 610 and the three second front connection terminal portions 620 . The second front relay terminal portion 630 extends upward from the front end portion of the second electrode terminal portion 610, bends to extend forward, and further bends to extend downward. The three second front connection terminal portions 620 are provided at the lower end portion of the second front relay terminal portion 630 so as to be arranged in the horizontal direction at equal intervals. The second front connection terminal portion 620 has a hook shape that extends slightly downward and then bends and extends forward. A circular through hole 621 is formed at the tip of the second front connection terminal portion 620 .

A second rear relay terminal portion 650 relays between the second electrode terminal portion 610 and the second rear connection terminal portion 640 . The second rear relay terminal portion 650 has a substantially rectangular shape and extends upward from the rear edge of the second electrode terminal portion 610 . The second rear connection terminal portion 640 is provided at the upper end portion of the second rear relay terminal portion 650 . The second rear connection terminal portion 640 extends upward, bends and extends rearward, further bends and extends downward, and then bends and extends rearward. A circular through hole 641 is formed at the tip of the second rear connection terminal portion 640 .

On the front side of capacitor element unit 100, three first front connection terminal portions 520 and three second front connection terminal portions 620 are arranged alternately in the left-right direction. Also, on the rear side of capacitor element unit 100, first rear connection terminal portion 540 and second rear connection terminal portion 640 are arranged in the left-right direction.

A first insulating sheet 700 is arranged between the first front relay terminal portion 530 of the first busbar 500 and the second front relay terminal portion 630 of the second busbar 600 . A second insulating sheet 800 is arranged between the second rear connection terminal portion 640 of the second bus bar 600 and the capacitor element 400 . The first insulating sheet 700 and the second insulating sheet 800 are made of insulating paper or a resin material having electrical insulation such as acryl or silicon. The first insulating sheet 700 ensures an insulating distance between the first bus bar 500 and the second bus bar 600 , and the second insulating sheet 800 allows the second rear connection terminal portion 640 of the second bus bar 600 and the first contact portion of the capacitor element 400 to be separated from each other. An insulating distance with the end surface electrode 410 is ensured. be. A portion of the first front relay terminal portion 530 and a portion of the second front relay terminal portion 630 overlap each other with the first insulating sheet 700 interposed therebetween, so that the first bus bar 500 and the second bus bar 600 have ESL (equivalent series inductance) is reduced.

FIGS. 5(a) and (b) are perspective views of the case 200 viewed from the front and rear, respectively.

Case 200 is made of resin, for example, polyphenylene sulfide (PPS), which is a thermoplastic resin. The case 200 is formed in a substantially rectangular parallelepiped box shape and has a bottom wall 201, a front side wall 202, a rear side wall 203, a left side wall 204 and a right side wall 205 rising from the bottom wall 201, and has an open top surface.

The front wall 202 and the rear wall 203 are formed with a front bulging portion 210 and a rear bulging portion 220 having rectangular pocket shapes elongated in the left-right direction, respectively, at the opening ends. The front bulging portion 210 and the rear bulging portion 220 are formed from a position midway from the bottom wall 201 of the case 200 to the opening 200a side, that is, from a position near the opening 200a to the opening 200a, and bulge outward. The lateral dimension of front bulging portion 210 (the direction perpendicular to the opening direction of case 200 ) is slightly larger than the lateral dimension of second front relay terminal portion 630 of second bus bar 600 . However, the lateral dimension of the front bulging portion 210 is smaller than the lateral dimension of the front wall 202 , and the front bulging portion 210 is not provided over the entire lateral direction of the front wall 202 . In addition, the dimension of the rear bulging portion 220 in the left-right direction is slightly smaller than the dimension of the first rear connection terminal portion 540 of the first bus bar 500 and the second rear connection terminal portion 640 of the second bus bar 600 aligned in the left-right direction. is enlarged to However, the lateral dimension of the rear bulging portion 220 is smaller than the lateral dimension of the rear wall 203 , and the rear bulging portion 220 is not provided over the entire lateral direction of the rear wall 203 .

Left sidewall 204 and right sidewall 205 are provided with mounting tabs 230 on the lower front and rear sides. An insertion hole 231 is formed in the attachment tab 230 . A metal collar 232 is fitted into the insertion hole 231 in order to increase the strength of the hole. A reinforcing rib 233 is provided on the left mounting tab 230 to connect with the left side wall 204 , and a reinforcing rib 233 is provided on the right mounting tab 230 to connect to the right side wall 205 . These mounting tabs 230 are used when the film capacitor 1 is fixed to an installation portion of an external device such as an inverter unit.

Capacitor element unit 100 is housed in case 200 , and molten filling resin 300 is injected into case 200 . At this time, filling resin 300 passes through flow holes 513 and 514 of first bus bar 500 and flow hole 613 of second bus bar 600 , thereby facilitating distribution of filling resin 300 between six capacitor elements 400 . When the filling resin 300 is filled in the case 200 to the vicinity of the opening 200a and the injection of the filling resin 300 is completed, the case 200 is heated. Thereby, the filling resin 300 in the case 200 is cured.

Thus, the film capacitor 1 is completed as shown in FIG. The three first front connection terminal portions 520, the three second front connection terminal portions 620, the first rear connection terminal portion 540 and the second rear connection terminal portion 640 are exposed from the filling resin 300 filled in the case 200. .

6(a) is a cross-sectional view of the film capacitor 1 cut along line AA' in FIG. 1, and FIG. 6(b) is a film capacitor cut along line BB' in FIG. 6(a). 1 is a sectional view of FIG.

As shown in FIG. 6A, second front relay terminal portion 630 of second bus bar 600 extends toward opening 200 a of case 200 with its surface facing the inner surface of front wall 202 of case 200 . It extends and is led out of the case 200 through the opening 200a. Second bus bar 600 has second rear relay terminal portion 650 extending toward opening 200a of case 200 with its surface opposed to the inner surface of rear side wall 203 of case 200 and extending to the side of opening 200a of case 200. A second rear connection terminal portion 640 following 650 is led out of the case 200 through the opening 200a.

The front wall 202 is provided with a front bulging portion 210 at the open end of the case 200, and the distance between the surface of the second bus bar 600, that is, the second front relay terminal portion 630, and the inner surface of the front wall 202 is The front bulging portion 210 is larger than the portion from the bottom wall 201 side to the front bulging portion 210 . For example, while the distance D1 up to the front swelling portion 210 is about 1.0 mm, the distance D2 at the front swelling portion 210 is about 3.0 mm. Further, the rear side wall 203 is provided with a rear bulging portion 220 at the opening end of the case 200 , and the surface of the second bus bar 600 , that is, the second rear relay terminal portion 650 and the second rear connection terminal portion 640 . The distance from the inner surface of the rear wall 203 is greater at the rear bulging portion 220 than at the portion from the bottom wall 201 side to the rear bulging portion 220 . For example, while the distance D3 up to the rear bulging portion 220 is approximately 1.0 mm, the distance D4 at the rear bulging portion 220 is approximately 3.0 mm.

In order to reduce the amount of filling resin 300 used in case 200, it is desirable to reduce the distance (gap) between second bus bar 600 and front side wall 202 and rear side wall 203 of case 200. FIG. However, in such a case, filling resin 300 injected into case 200 tends to creep up from the gap between second bus bar 600 and front side wall 202 and rear side wall 203 at the open end of case 200 due to capillary action. As a result, the filling resin 300 may leak out of the case 200 .

In the present embodiment, by providing front bulging portion 210 and rear bulging portion 220 , second bus bar 600 and front side wall 202 of case 200 are separated from each other to the extent that capillary action does not occur at the open end of case 200 . and the rear side wall 203 can be secured. Therefore, filling resin 300 is prevented from creeping up through gaps between second bus bar 600 and front side wall 202 and rear side wall 203 and leaking out of case 200 . Moreover, on the bottom wall 201 side of the case 200 with respect to the front bulging portion 210 and the rear bulging portion 220, the gap between the second bus bar 600 and the front side wall 202 and the rear side wall 203 can be made smaller, so the amount of filling resin 300 used can be reduced. You can suppress the increase.

The rear bulging portion 220 also exists at the position of the first rear connection terminal portion 540 of the first bus bar 500 (see FIG. 6(b)), and the rear bulging portion 220 serves as the first rear connection terminal portion. Between 540 and rear wall 203, it is possible to secure a gap to the extent that capillary action does not occur. Therefore, filling resin 300 is also prevented from creeping up through the gap between first bus bar 500 and rear side wall 203 and leaking out of case 200 .

As shown in FIG. 6B, in the left-right direction (the direction orthogonal to the opening direction of case 200), front bulging portion 210 is located outside second front relay terminal portion 630 of second bus bar 600 (left and right sides). ). As a result, the gap between the left end portion of the front bulging portion 210 and the left end portion of the second front relay terminal portion 630 and the gap between the right end portion of the front bulging portion 210 and the right end portion of the second front relay terminal portion 630 are widened. be able to. In the left-right direction, rear bulging portion 220 extends outside (to the left and right) beyond first rear connection terminal portion 540 of first bus bar 500 and second rear connection terminal portion 640 of second bus bar 600 which are aligned in the left-right direction. ing. As a result, the gap between the left end of the rear bulging portion 220 and the left end of the first rear connection terminal portion 540 and the gap between the right end of the rear bulging portion 220 and the right end of the second rear connection terminal portion 640 are widened. be able to.

As a result, filling resin 300 can be further prevented from creeping up between second bus bar 600 and front side wall 202 and rear side wall 203 of case 200 . Therefore, the filling resin 300 can be further prevented from creeping up.

Film capacitor 1 can be mounted, for example, in an inverter unit for driving an electric motor in an electric vehicle. Power is supplied to the inverter unit from a power supply (battery). In this case, an external terminal (not shown) connected to the power supply device uses the through holes 541 and 641 in the first rear connection terminal portion 540 of the first bus bar 500 and the second rear connection terminal portion 640 of the second bus bar 600 . connected by screws. In addition, external terminals (not shown) connected to the inverter circuit use through holes 521 and 621 in the first front connection terminal portion 520 of the first bus bar 500 and the second front connection terminal portion 620 of the second bus bar 600. Connected by screwing.

<Effect of Embodiment>
As described above, according to the present embodiment, the following effects can be obtained.

Second bus bar 600 extends toward opening 200a of case 200 with its surface opposed to the inner surfaces of front side wall 202 and rear side wall 203 of case 200, and is led out of case 200 from opening 200a. be. The front side wall 202 and the rear side wall 203 are formed along the opening 200a from a position midway from the bottom wall 201 side of the case 200 to the opening 200a side, and form a front bulging portion 210 and a rear bulging portion 220 that bulge outward. include. The distance between the surface of second bus bar 600 and the inner surfaces of front side wall 202 and rear side wall 203 is greater than the distance from bottom wall 201 to front bulging portion 210 and rear bulging portion 220 . It becomes large at the exit portion 220 .

According to this configuration, a gap can be secured between the second bus bar 600 and the front side wall 202 and the rear side wall 203 of the case 200 to the extent that capillary action does not occur at the open end of the case 200 . Filling resin 300 is prevented from creeping up from gaps between 600 and front side wall 202 and rear side wall 203 and leaking out of case 200 . Moreover, on the bottom wall 201 side of the case 200 with respect to the front bulging portion 210 and the rear bulging portion 220, the gap between the second bus bar 600 and the front side wall 202 and the rear side wall 203 can be made smaller, so the amount of filling resin 300 used can be reduced. You can suppress the increase.

Further, the front swelling portion 210 and the rear swelling portion 220 are formed from a position closer to the opening 200a of the case 200 than the capacitor element 400 to the opening 200a.

According to this configuration, since the front bulging portion 210 and the rear bulging portion 220 can be provided only in the portion near the opening 200a of the case 200, it is possible to further suppress an increase in the amount of the filling resin 300 used.

Further, front bulging portion 210 and rear bulging portion 220 extend outside second bus bar 600 in a direction (horizontal direction) orthogonal to the opening direction of case 200 .

According to this configuration, it is possible to further prevent filling resin 300 from creeping up between second bus bar 600 and front side wall 202 and rear side wall 203 of case 200 .

Further, the dimensions of front bulging portion 210 and rear bulging portion 220 are made smaller than the dimensions of front side wall 202 and rear side wall 203 in the direction (horizontal direction) orthogonal to the opening direction of case 200 .

According to this configuration, the front bulging portion 210 and the rear bulging portion 220 are not provided over the entire front wall 202 and the rear wall 203 in the direction orthogonal to the opening direction of the case 200 , so the filling resin 300 It is possible to further suppress the increase in the amount used.

<Change example>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the application examples of the present invention can be modified in various ways in addition to the above-described embodiments. It is possible.

For example, in the above-described embodiment, as shown in FIG. 6A, front swelling portion 210 and rear swelling portion 220 are positioned closer to opening 200a of case 200 than capacitor element 400, that is, capacitor element 400 is formed from a position higher than the first end face electrode 410 to the opening 200a. However, front bulging portion 210 and rear bulging portion 220 may be formed from a position lower than first end face electrode 410 of capacitor element 400 (a position near bottom wall 201) to opening 200a. However, in this case, the amount of filling resin 300 used is slightly larger than in the above embodiment.

In the above-described embodiment, as shown in FIG. 6A, the case 200 is filled with the filling resin 300 up to a position higher than the bottom walls of the front bulging portion 210 and the rear bulging portion 220 . However, by raising the positions of the bottom walls of the front bulging portion 210 and the rear bulging portion 220 and lowering the height position of the filling resin 300 compared to the above embodiment, the front bulging portion 210 and the rear bulging portion The case 200 may be filled with the filling resin 300 to a position lower than the bottom wall of the portion 220 , that is, to a position that does not overlap the front bulging portion 210 and the rear bulging portion 220 .

Furthermore, in the above-described embodiment, since second bus bar 600 faces front side wall 202 and rear side wall 203 of case 200, front side wall 202 and rear side wall 203 are provided with front bulging portion 210 and rear bulging portion 220, respectively. rice field. However, a configuration in which second bus bar 600 faces left side wall 204 and right side wall 205 of case 200 may be adopted, and correspondingly left side wall 204 and right side wall 205 are provided with bulging portions. may

Furthermore, in the above embodiment, the capacitor element unit 100 includes six capacitor elements 400 . However, the number of capacitor elements 400 can be changed as appropriate, including the case where it is one. Also, the orientation (orientation) of capacitor element 400 in case 200 can be changed as appropriate.

Furthermore, in the above-described embodiment, the capacitor element 400 is formed by stacking two metallized films in which aluminum is vapor-deposited on a dielectric film, and winding or laminating the stacked metallized films. Alternatively, the capacitor element 400 may be formed by stacking a metallized film in which aluminum is vapor-deposited on both sides of a dielectric film and an insulating film, and then winding or laminating them.

Furthermore, in the above embodiment, the film capacitor 1 was mentioned as an example of the capacitor of the present invention. However, the present invention can also be applied to capacitors other than the film capacitor 1 .

In addition, the embodiments of the present invention can be appropriately modified in various ways within the scope of the technical idea indicated in the scope of claims.

In the description of the above embodiments, terms such as "upper" and "lower" indicate relative directions that depend only on the relative positional relationship of constituent members, and are vertical and horizontal. It does not indicate an absolute direction such as

INDUSTRIAL APPLICABILITY The present invention is useful for capacitors used in various electronic equipment, electrical equipment, industrial equipment, electrical equipment of vehicles, and the like.

1 Film capacitor (capacitor)
200 case 200a opening 201 bottom wall 202 front side wall (side wall)
203 rear wall (side wall)
210 front bulging portion (bulging portion)
220 rear bulging portion (bulging portion)
300 Filling resin 400 Capacitor element 410 First end surface electrode (electrode)
420 second end face electrode (electrode)
500 first busbar (busbar)
600 second busbar (busbar)

Claims (4)

a capacitor element;
a plate-shaped bus bar connected to the electrodes of the capacitor element;
a case in which the capacitor element is accommodated;
and a filling resin filled in the case,
The bus bar extends toward the opening side of the case with its surface facing the inner surface of the side wall of the case, and is led out of the case from the opening,
a side wall of the case opposed to the bus bar includes an outwardly bulging portion extending from a position midway from the bottom wall side of the case to the opening side to the opening;
The distance between the surface of the bus bar and the inner surface of the side wall is larger at the bulging portion than at the portion from the bottom wall side to the bulging portion.
A capacitor characterized by: A capacitor according to claim 1, wherein
The bulging portion is formed from a position closer to the opening of the case than the capacitor element to the opening,
A capacitor characterized by: 3. In the capacitor according to claim 1 or 2,
The bulging portion extends outward from the bus bar in a direction orthogonal to the opening direction of the case.
A capacitor characterized by: A capacitor according to claim 3, wherein
the dimension of the bulging portion is smaller than the dimension of the side wall in the orthogonal direction;
A capacitor characterized by:

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