Capacitor

Abstract

To provide a capacitor that may ensure a long creepage distance between a first bus bar and a second bus bar while suppressing the amount of extension of an insulating member toward the non-overlapping portion of the first bus bar.SOLUTION: A first bus bar 500 includes a non-overlapping portion 512 that is continuous with a first overlapping portion 511 and does not overlap with a second overlapping portion 611 of a second bus bar 600, and a connection terminal portion 520 that protrudes from the non-overlapping portion 512 and is connected to the external terminal 2a. An insulating member 700 includes a first portion 711 that is interposed between the first overlapping portion 511 and the second overlapping portion 611, a second portion 712 that is continuous with the first portion 711 and overlaps the non-overlapping portion 512, and a first rib 717 that protrudes from the second portion 712 to the side opposite the non-overlapping portion 512. The first rib 717 extends in a left-right direction perpendicular to the up-down direction in which the non-overlapping portion 512 and the second overlapping portion 611 are aligned.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a capacitor. [Background technology]

[0002] Patent document 1 describes a film capacitor in which metallikon electrodes are formed on both end faces of a capacitor element, a bus bar is connected to each of the metallikon electrodes, and portions of the pair of bus bars are overlapped with a holding member formed of insulating resin sandwiched between them, thereby reducing mutual inductance (equivalent series inductance).

[0003] In the film capacitor of Patent Document 1, the first portions of a pair of bus bars overlap with each other, sandwiching a flat portion of a holding member. An external connection terminal portion is formed on one end of each of the first portions. One ends of the two first portions are connected via one end of the flat portion, and a creepage distance equal to the thickness of the flat portion is secured between the two first portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2016 / 027462 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned film capacitor, the two first portions have ends at the same position where the external connection terminals are formed. In contrast, the pair of bus bars may be configured such that one first portion extends outward from the other first portion at the end where the external connection terminals are formed, so that the ends of the two first portions are not at the same position. In this case, the portion that extends outward becomes a non-overlapping portion that does not overlap with the other first portion.

[0006] In this configuration, if the flat plate portion extends from one end of the other first portion toward the non-overlapping portion, the total distance between the thickness of the flat plate portion and the length of the extension becomes the creepage distance between the two first portions, so the creepage distance can be increased. This makes it easier to ensure the necessary creepage distance between the two first portions even if the voltage applied to the film capacitor increases.

[0007] However, if the flat portion extends far toward the non-overlapping portion, there is a concern that when the film capacitor is installed in an external device, parts related to the external device, such as the external terminals connected to the external connection terminal portion, may easily interfere with the part extending toward the non-overlapping portion.

[0008] Therefore, an object of the present invention is to provide a capacitor that can ensure a long creepage distance between the first bus bar and the second bus bar while suppressing the amount of extension of the insulating material toward the non-overlapping portion of the first bus bar. [Means for solving the problem]

[0009] A capacitor according to a main aspect of the present invention includes a capacitor element, a first bus bar and a second bus bar connected to the capacitor element, and an insulating member disposed between the first bus bar and the second bus bar. The first bus bar includes a first overlapping portion, and the second bus bar includes a second overlapping portion, and the first overlapping portion and the second overlapping portion overlap each other. The insulating member is disposed between the first overlapping portion and the second overlapping portion. The first bus bar includes a non-overlapping portion that is continuous with the first overlapping portion and does not overlap with the second overlapping portion, and a connection terminal portion that protrudes from the non-overlapping portion and is connected to an external terminal. The insulating member includes a first portion that is interposed between the first overlapping portion and the second overlapping portion, a second portion that is continuous with the first portion and overlaps with the non-overlapping portion, and a protruding portion that protrudes from the second portion to the opposite side to the non-overlapping portion. The protruding portion extends in a second direction perpendicular to a first direction in which the first overlapping portion and the non-overlapping portion are aligned. Effect of the Invention

[0010] According to the present invention, it is possible to provide a capacitor that can ensure a long creepage distance between the first bus bar and the second bus bar while suppressing the amount of extension of the insulating member toward the non-overlapping portion of the first bus bar.

[0011] The effects and significance of the present invention will become clearer from the following description of the embodiment. However, the embodiment shown below is merely an example of how the present invention can be put into practice, and the present invention is not limited to the embodiment described below. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a film capacitor according to an embodiment. [Diagram 2] FIG. 2(a) is a perspective view of a capacitor element unit according to the embodiment as viewed from above the front, and FIG. 2(b) is a perspective view of a capacitor element unit according to the embodiment as viewed from above the rear. [Diagram 3] FIG. 3(a) is a perspective view of a first bus bar according to the embodiment, and FIG. 3(b) is a perspective view of a second bus bar according to the embodiment. [Figure 4] FIG. 4(a) is a perspective view of an insulating member according to the embodiment as viewed from above the front, and FIG. 4(b) is a perspective view of an insulating member according to the embodiment as viewed from above the rear. [Diagram 5] FIG. 5 is a front view of a main part of a capacitor element unit according to an embodiment. [Figure 6] FIG. 6(a) is a rear view of a main part of the capacitor element unit according to the embodiment, and FIG. 6(b) is a cross-sectional view taken along line AA' of FIG. 6(a). [Figure 7] FIG. 7 is a cross-sectional view of a mold used for injection molding of an insulating member according to an embodiment. [Figure 8] 8(a) and (b) are plan views of a first member and a second member constituting a mold according to an embodiment, respectively, viewed from their parting surfaces. [Figure 9]Fig. 9(a) is a rear view of an insulating member according to a modified example, and Figs. 9(b) and (c) are side cross-sectional views of the insulating member according to the modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A film capacitor 1, which is one embodiment of a capacitor of the present invention, will be described below with reference to the drawings. For convenience, the front-rear, left-right, and up-down directions are indicated in each drawing as appropriate. Note that the directions shown in the drawings indicate only relative directions of the film capacitor 1, and do not indicate absolute directions. For convenience of explanation, some configurations may be given names that correspond to the directions shown in the drawings, such as "front" and "rear."

[0014] In the present embodiment, film capacitor 1 corresponds to the "capacitor" recited in the claims. Also, first rib 717 corresponds to the "protrusion" recited in the claims. Furthermore, second rib 718 corresponds to the "connection" recited in the claims. Furthermore, the up-down direction corresponds to the "first direction" recited in the claims, and the left-right direction corresponds to the "second direction" recited in the claims.

[0015] However, the above description is intended merely to match the configuration of the claims with the configuration of the embodiments, and the above correspondence does not in any way limit the invention described in the claims to the configuration of the embodiments.

[0016] <Composition of film capacitor> FIG. 1 is a perspective view of a film capacitor 1. FIG.

[0017] The film capacitor 1 includes a capacitor element unit 100, a case 200 in which the capacitor element unit 100 is housed, and a filled resin 300 that is filled in the case 200. The portion of the capacitor element unit 100 that is buried in the filled resin 300, in particular the capacitor element 400, is protected from moisture and impact by the case 200 and the filled resin 300.

[0018] FIG. 2(a) is a perspective view of the capacitor element unit 100 seen from above the front, and FIG. 2(b) is a perspective view of the capacitor element unit 100 seen from above the rear.

[0019] Capacitor element unit 100 includes a capacitor element 400 , a first bus bar 500 , a second bus bar 600 , and an insulating member 700 .

[0020] Capacitor element 400 is formed by stacking two metallized films, each having aluminum vapor-deposited on a dielectric film, rolling or laminating the stacked metallized films, and pressing them into a flat shape. Capacitor element 400 has first electrode 410 formed on one end face by spraying a metal such as zinc, and second electrode 420 formed on the other end face by spraying a metal such as zinc.

[0021] Although capacitor element 400 in the present embodiment is formed of a metallized film in which aluminum is deposited on a dielectric film, it may also be formed of a metallized film in which other metals such as zinc, magnesium, etc. Alternatively, capacitor element 400 may be formed of a metallized film in which a plurality of these metals are deposited, or a metallized film in which an alloy of these metals is deposited.

[0022] FIG. 3( a ) is a perspective view of the first bus bar 500 .

[0023] First bus bar 500 is formed by appropriately cutting and bending a metal plate, such as a copper plate, which is a conductive material having a predetermined shape.

[0024] The first bus bar 500 includes a main body portion 510 having a rectangular flat plate shape. The main body portion 510 is divided in the up-down direction into a portion that becomes a first overlapping portion 511 and a portion that becomes a non-overlapping portion 512 that is continuous with the first overlapping portion 511. The non-overlapping portion 512 is located above the first overlapping portion 511. In FIG. 3(a), for convenience, the boundary between the first overlapping portion 511 and the non-overlapping portion 512 is indicated by a two-dot chain line.

[0025] At the upper part of the main body 510 included in the non-overlapping portion 512, a part of the main body 510 is cut and raised, so that four rectangular connection terminal parts 520 are formed lined up in the left-right direction. In the part of the main body 510 where each connection terminal part 520 is cut and raised, a rectangular opening part 513 larger than the connection terminal part 520 is formed. Each opening part 513 is adjacent to a corresponding connection terminal part 520 and lined up in the left-right direction.

[0026] Four rectangular openings 514 are formed in the middle of the main body 510 included in the first overlapping portion 511 at the same positions in the left-right direction as the four openings 513. The four openings 514 have the same size as the four openings 513. Furthermore, rectangular through holes 515 that are long in the vertical direction are formed at the left and right ends of the middle of the main body 510.

[0027] The lower part of the main body portion 510 included in the first overlap portion 511 has a circular opening 516 formed in the center.

[0028] Furthermore, first bus bar 500 includes electrode terminal portion 530 that is bent from the lower end of main body portion 510 at a right angle to main body portion 510. Electrode terminal portion 530 has a rectangular plate shape that is elongated in the left-right direction.

[0029] Furthermore, first bus bar 500 includes bent portions 540 that are bent at right angles to main body portion 510 from each of the left and right ends of main body portion 510, i.e., first overlapping portion 511 and non-overlapping portion 512. Each bent portion 540 has a rectangular plate shape that is elongated in the vertical direction. Each bent portion 540 contacts each through hole 515.

[0030] FIG. 3( b ) is a perspective view of the second bus bar 600 .

[0031] Second bus bar 600 is formed by appropriately cutting and bending a metal plate, such as a copper plate, which is a conductive material having a predetermined shape.

[0032] The second bus bar 600 includes a main body portion 610 having a rectangular flat plate shape. The main body portion 610 is divided in the up-down direction into a portion that becomes a second overlapping portion 611 and a portion that becomes a non-overlapping portion 612 that is continuous with the second overlapping portion 611. The non-overlapping portion 612 is located below the second overlapping portion 611. In FIG. 3(b), for convenience, the boundary between the second overlapping portion 611 and the non-overlapping portion 612 is indicated by a two-dot chain line.

[0033] At the upper part of the main body 610 included in the second overlapping portion 611, a part of the main body 610 is cut and raised, so that four rectangular connection terminal parts 620 are formed lined up in the left-right direction. In the part of the main body 610 where each connection terminal part 620 is cut and raised, a rectangular opening part 613 larger than the connection terminal part 620 is formed. Each opening part 613 is adjacent to a corresponding connection terminal part 620 and lined up in the left-right direction. The four opening parts 613 have the same size as the four opening parts 514 of the first bus bar 500.

[0034] A circular opening 614 is formed in the center of the intermediate portion of the main body portion 610 included in the second overlap portion 611.

[0035] Furthermore, second bus bar 600 includes electrode terminal portion 630 that is bent from the lower end of main body portion 610 at a right angle to main body portion 610. Electrode terminal portion 630 has a rectangular plate shape that is elongated in the left-right direction.

[0036] FIG. 4(a) is a perspective view of the insulating member 700 as viewed from above the front, and FIG. 4(b) is a perspective view of the insulating member 700 as viewed from above the rear.

[0037] The insulating member 700 is made of a resin such as polyphenylene sulfide (PPS) and is formed by injection molding, which will be described later.

[0038] The insulating member 700 includes a main body 710 having a substantially rectangular plate shape that is long in the left-right direction. The main body 710 is divided in the up-down direction into a first portion 711, a second portion 712 that is continuous with the first portion 711, and a third portion 713 that is continuous with the first portion 711. The second portion 712 is located above the first portion 711, and the third portion 713 is located below the first portion 711. For convenience, the boundaries between the first portion 711 and the second portion 712 and the boundaries between the first portion 711 and the third portion 713 are indicated by two-dot chain lines in Figures 4(a) and (b).

[0039] In the center of first portion 711 of main body 710, a part of front surface 710a of main body 710 protrudes and a part of rear surface 710b of main body 710 is recessed, thereby forming a substantially cylindrical protruding portion 714. Protruding portion 714 has a recess 714a on the back side. A substantially cylindrical gate mark 715 is formed on the surface recessed by protruding portion 714, i.e., the bottom surface of recess 714a, in rear surface 710b of main body 710. Gate mark 715 is formed by injection molding. The outer diameter of protruding portion 714 is smaller than the inner diameter of opening 516 of first bus bar 500 and opening 614 of second bus bar 600.

[0040] Furthermore, four rectangular openings 716 aligned in the left-right direction are formed in the upper portion of first portion 711. The four openings 716 have the same size as the four openings 514 of first bus bar 500.

[0041] Two first ribs 717 are formed on the rear surface 710b of the second portion 712 of the main body 710, protruding rearward and extending in the left-right direction from the left end to the right end. The two first ribs 717 are arranged in the up-down direction with a predetermined interval between them. The predetermined interval is set to a distance equal to or greater than the distance (1 mm) at which the two first ribs 717 are considered to be apart according to regulations related to creepage distance.

[0042] The two first ribs 717 are connected at their left and right ends by a second rib 718. The height of each second rib 718 is the same as the height of each first rib 717.

[0043] Furthermore, the insulating member 700 includes a clamping portion 720 at each of the left end and the right end of the front surface 710a side of the main body portion 710. The clamping portion 720 is composed of a first contact portion 721 located on the outer side of the insulating member 700 and a second contact portion 722 located on the inner side. The first contact portion 721 has a rectangular plate shape elongated in the vertical direction. The second contact portion 722 has a rectangular parallelepiped shape elongated in the vertical direction. The vertical dimension of the first contact portion 721 is larger than the vertical dimension of the second contact portion 722, and the horizontal dimension of the first contact portion 721 is smaller than the horizontal dimension of the second contact portion 722. The first contact portion 721 and the second contact portion 722 have the same dimensions in the front-rear direction. The front-rear dimension of the bent portion 540 of the first bus bar 500 is larger than the front-rear dimension of the first contact portion 721 and the second contact portion 722.

[0044] The first contact portion 721 includes two first ribs 721a. The two first ribs 721a are formed on a side surface of the first contact portion 721 facing the second contact portion 722, at an upper portion and a lower portion of the second contact portion 722, respectively, and extend in the front-rear direction. The second contact portion 722 includes one second rib 722a. The second rib 722a is formed on a side surface of the second contact portion 722 facing the first contact portion 721, at a position between the two first ribs 721a, and extends in the front-rear direction. The gap between the first rib 721a and the second rib 722a is slightly smaller than the thickness (dimension in the left-right direction) of the bent portion 540 of the first bus bar 500.

[0045] 2(a) and (b), the first bus bar 500 is attached to the front side of the insulating member 700. The main body 510 of the first bus bar 500 contacts the front surface 710a of the main body 710 of the insulating member 700. The protruding portions 714 of the insulating member 700 penetrate the openings 516 of the first bus bar 500. The bent portions 540 on both the left and right sides of the first bus bar 500 are clamped by the clamping portions 720 of the insulating member 700. The four openings 514 of the first bus bar 500 overlap the four openings 716 of the insulating member 700.

[0046] The second bus bar 600 is attached to the rear side of the insulating member 700. The main body 610 of the second bus bar 600 contacts the rear surface 710b of the main body 710 of the insulating member 700. The recess 714a of the insulating member 700 overlaps the opening 614 of the second bus bar 600, and the gate mark 715 overlaps the opening 614. There may be some variation in the height of the gate mark 715. When the gate mark 715 becomes high and protrudes rearward from the recess 714a, the tip of the protruding gate mark 715 is inserted into the opening 614 and does not interfere with the main body 610 of the second bus bar 600.

[0047] The four openings 613 of the second bus bar 600 overlap with the four openings 716 of the insulating member 700, and each connection terminal portion 620 of the second bus bar 600 protrudes forward of the first bus bar 500 through each of the three overlapping openings 514, 716, 613. The terminal row of the four connection terminal portions 620 is located below the four connection terminal portions 520. The positions of the front ends of the four connection terminal portions 520 and the positions of the front ends of the four connection terminal portions 620 are aligned.

[0048] The first overlapping portion 511 of the first bus bar 500 and the second overlapping portion 611 of the second bus bar 600 overlap in the front-rear direction. The non-overlapping portion 512 of the first bus bar 500 does not overlap the second overlapping portion 611, and the non-overlapping portion 612 of the second bus bar 600 does not overlap the first overlapping portion 511. A first portion 711 of the insulating member 700 is interposed between the first overlapping portion 511 and the second overlapping portion 611. A second portion 712 of the insulating member 700 overlaps the non-overlapping portion 512 of the first bus bar 500. A third portion 713 of the insulating member 700 is interposed between the non-overlapping portion 612 of the second bus bar 600 and the circumferential surface of the capacitor element 400.

[0049] The capacitor element 400 is disposed between the electrode terminal portion 530 of the first bus bar 500 and the electrode terminal portion 630 of the second bus bar 600. The electrode terminal portion 530 is joined to the first electrode 410 of the capacitor element 400 by a joining method such as soldering. This electrically connects the first bus bar 500 to the first electrode 410. Similarly, the electrode terminal portion 630 is joined to the second electrode 420 of the capacitor element 400 by a joining method such as soldering. This electrically connects the second bus bar 600 to the second electrode 420. Note that pin-shaped terminals may be formed on the electrode terminal portions 530, 630, and these terminals may be joined to the electrodes 410, 420 by soldering or the like.

[0050] FIG. 5 is a front view of a main part of the capacitor element unit 100. As shown in FIG.

[0051] 5, in each clamping portion 720 of the insulating member 700, a first rib 721a of a first contact portion 721 contacts the bent portion 540 from the outside of the first bus bar 500, and a second rib 722a of a second contact portion 722 passing through a through hole 515 of the first bus bar 500 contacts the bent portion 540 from the inside of the first bus bar 500. The first rib 721a and the second rib 722a are so-called crush ribs, and when the bent portion 540 is inserted between the first contact portion 721 and the second contact portion 722, the tip portion of the crush rib is scraped or deformed by the bent portion 540. The first contact portion 721 and the second contact portion 722 contact the bent portion 540 from both sides, and thus a force (force suppressing movement) that holds the first bus bar 500 in the front-rear direction is generated in the insulating member 700.

[0052] First bus bar 500 is positioned in the front-rear and left-right directions with respect to insulating member 700 by a positioning structure formed by bent portions 540 and clamping portions 720 .

[0053] The vertical dimension of through hole 515 is larger than the vertical dimension of second contact portion 722, and a relatively large gap is generated above and below between second contact portion 722 and through hole 515. Therefore, in the present embodiment, another positioning structure (not shown) is provided between first bus bar 500 and insulating member 700, and this positioning structure positions first bus bar 500 in the vertical direction relative to insulating member 700. Furthermore, a positioning structure (not shown) is also provided between second bus bar 600 and insulating member 700, and this positioning structure positions second bus bar 600 in the vertical, front-rear, and left-right directions relative to insulating member 700.

[0054] FIG. 6(a) is a rear view of a main part of the capacitor element unit 100, and FIG. 6(b) is a cross-sectional view taken along line AA' of FIG. 6(a).

[0055] 6(a) and (b), the four connection terminal portions 520 of the first bus bar 500 protrude from the non-overlapping portion 512 to the side opposite (the front side) the second portion 712 of the insulating member 700. The upper end of the second portion 712 is at the same height as the lower ends of the four openings 513 of the first bus bar 500, and the second portion 712 does not overlap with the four openings 513 and the four connection terminal portions 520 in the front-rear direction. Note that the second portion 712 may overlap the lower ends of the four openings 513, if only slightly.

[0056] In the second portion 712 of the insulating member 700, the two first ribs 717 protrude to the opposite side (rear side) from the non-overlapping portion 512 of the first bus bar 500, and have a dimension that is slightly longer in the left-right direction than the overlapping range R so as to be present in the overlapping range R where the range of the non-overlapping portion 512 and the range of the second overlapping portion 611 of the second bus bar 600 overlap when viewed from the top-bottom direction. In addition, the two second ribs 718 connect the two first ribs 717 outside the overlapping range R in the left-right direction.

[0057] 6(b), a creepage distance D in the up-down direction is ensured between non-overlapping portion 512 of first bus bar 500 and second overlapping portion 611 of second bus bar 600 by second portion 712 of insulating member 700 and two first ribs 717. The rear side of second portion 712 has an uneven surface due to the two first ribs 717. For this reason, the creepage distance D is longer than when the rear side of second portion 712 is flat.

[0058] 1, case 200 is made of resin, for example, polyphenylene sulfide (PPS), which is a thermoplastic resin. Case 200 is formed in a substantially rectangular box shape, and has an opening 201 on the top surface.

[0059] The case 200 is provided with mounting tabs 210 on the left and right outer surfaces and the outer bottom surface. Each mounting tab 210 is formed with an insertion hole 211 penetrating in the front-to-rear direction. A metal collar 212 is fitted into the insertion hole 211 to increase the strength of the hole. When the film capacitor 1 is installed in an installation portion of an external device or the like, these mounting tabs 210 are fixed to the installation portion with screws or the like.

[0060] The filling resin 300 is a thermosetting resin such as an epoxy resin.

[0061] Capacitor element unit 100 is accommodated in case 200 through opening 201. Filling resin 300 in a liquid phase is injected through opening 201 into case 200 with capacitor element unit 100 accommodated therein. Filling resin 300 fills case 200 up to the vicinity of opening 201, and when the injection of filling resin 300 is completed, case 200 is heated. This causes filling resin 300 in case 200 to harden. In this manner, film capacitor 1 is completed.

[0062] The film capacitor 1 is mounted on an external device or the like. The external device or the like is provided with four external terminals 2a on the positive electrode side and four external terminals 2b on the negative electrode side, each of which takes the form of a bus bar. For example, when the first bus bar 500 is a bus bar on the positive electrode side and the second bus bar 600 is a bus bar on the negative electrode side, as shown in FIG. 1, the four external terminals 2a come into contact with the four connection terminal portions 520 of the first bus bar 500 from the rear through the openings 513 and are connected to the connection terminal portions 520 by a joining method such as soldering. Furthermore, the four external terminals 2b come into contact with the four connection terminal portions 620 of the second bus bar 600 from the rear through three openings 613, 716, 514 that overlap in the front-rear direction and are connected to the connection terminal portions 620 by a joining method such as soldering.

[0063] <Method of manufacturing insulating members> Next, a method for manufacturing the insulating member 700 will be described.

[0064] Fig. 7 is a cross-sectional view of a mold 800 used for injection molding of an insulating member 700. Figs. 8(a) and 8(b) are plan views of a first member 801 and a second member 802 constituting the mold 800, respectively, as viewed from their parting surfaces. Note that for convenience, Fig. 8(a) shows the outline of a first molding surface 811 by a dashed line, and Fig. 8(b) shows a gate 820 by a dashed line.

[0065] The insulating member 700 is formed by injection molding using a mold 800 in a molding process.

[0066] The mold 800 is made of steel and is configured by joining a first member 801, which is a core, and a second member 802, which is a cavity. Inside the mold 800, a mold portion 810 having the shape of the insulating member 700 is formed. The mold portion 810 includes a first molding surface 811 for forming a rear surface 710b of the main body portion 710 of the insulating member 700, and a second molding surface 812 for forming a front surface 710a of the main body portion 710 facing away from the rear surface 710b.

[0067] First molding surface 811 includes a substantially cylindrical protruding portion 813 that protrudes toward second molding surface 812 at a position corresponding to the center of main body portion 710. Second molding surface 812 also includes a substantially cylindrical recessed portion 814 that accommodates protruding portion 813. A gap is formed between protruding portion 813 and recessed portion 814. The distance between tip surface 813a of protruding portion 813 and bottom surface 814a of recessed portion 814 is made larger than the distance between first molding surface 811 and second molding surface 812 around it, and the portion between tip surface 813a and bottom surface 814a becomes large gap portion 815.

[0068] In the first molding surface 811, a gate 820 which is an inlet for injecting resin into the mold portion 810 is formed on a tip surface 813a of the protruding portion 813. The gate 820 is circular and opens in the large gap portion 815. In the mold 800, a runner 830 connected to the gate 820 is formed in the first member 801.

[0069] In the molding process, gate 820 is opened by a valve (not shown), and molten resin is injected from gate 820 through runner 830 into mold section 810. As shown by the arrows in Figures 7 and 8, the resin first flows into large gap section 815 of mold section 810. Then, the resin flows radially from large gap section 815 and spreads around. As a result, the entire inside of mold section 810 is filled with resin.

[0070] Here, since gate 820 is provided on first molding surface 811 of mold portion 810 constituting the surface (rear surface 710b) of main body portion 710 of insulating member 700, resin can be injected from a portion close to the center of plate-shaped main body portion 710. This shortens the distance that resin flows within mold portion 810, making it easier for the resin to spread throughout mold portion 810. Furthermore, large gap portion 815 serves as a reservoir for the resin that has flowed into mold portion 810 from gate 820, improving the fluidity of the resin within mold portion 810 and shortening the time it takes for the resin to spread throughout mold portion 810.

[0071] The resin filled in the mold part 810 cools to form the insulating member 700. When filling of the resin into the mold part 810 is completed, the gate 820 is closed by the valve. At this time, resin remains near the gate 820, and this resin cools to become a gate mark 715. Thereafter, the mold 800 is separated, and the insulating member 700 is taken out from the inside.

[0072] In this way, the insulating member 700 shown in Figures 4(a) and (b) is completed. In the main body 710 of the insulating member 700, a protruding portion 714 is formed by filling a space between the protruding portion 813 and the recessed portion 814 of the mold portion 810 with resin. The tip portion of the protruding portion 714 is thicker than the other portions of the main body 710. A gate mark 715 protruding backward is formed on the recessed surface on the back side of the protruding portion 714.

[0073] <Effects of the embodiment> As described above, according to the present embodiment, the following effects are achieved.

[0074] The first bus bar 500 includes a non-overlapping portion 512 that is continuous with the first overlapping portion 511 and does not overlap with the second overlapping portion 611 of the second bus bar 600, and a connection terminal portion 520 that protrudes from the non-overlapping portion 512 and is connected to the external terminal 2a. The insulating member 700 includes a flat first portion 711 that is interposed between the first overlapping portion 511 and the second overlapping portion 611, a flat second portion 712 that is continuous with the first portion 711 and overlaps the non-overlapping portion 512, and a first rib 717 that protrudes from the second portion 712 to the side opposite the non-overlapping portion 512 and extends in the left-right direction so as to be present in an overlapping range R where the range of the non-overlapping portion 512 and the range of the second overlapping portion 611 overlap when viewed from the up-down direction.

[0075] With this configuration, the amount by which the second portion 712 of the insulating member 700 extends toward the non-overlapping portion 512 of the first bus bar 500 (the vertical dimension of the second portion 712) can be reduced, while the creepage distance D between the non-overlapping portion 512 of the first bus bar 500 and the second overlapping portion 611 of the second bus bar 600 in the vertical direction can be increased.

[0076] Further, the first ribs 717 are provided in a plurality (two ribs) arranged at intervals in the up-down direction, and the insulating member 700 includes a second rib 718 that is provided outside the overlapping range R in the left-right direction and connects the multiple first ribs 717.

[0077] According to this configuration, by providing a plurality of first ribs 717, it is possible to ensure the same creepage distance D while reducing the height (protrusion amount) of the first ribs 717. Also, by being connected by the second ribs 718, the plurality of first ribs 717 are reinforced. Furthermore, since the second ribs 718 are provided outside the overlapping range R in the left-right direction, no portion is created where the creepage distance D is shortened.

[0078] Furthermore, when the second rib 718 is provided inside the overlapping range R in the left-right direction, the creepage distance D becomes shorter in the area where the second rib 718 exists because the multiple first ribs 717 are connected by the second rib 718.

[0079] Furthermore, the connection terminal portions 520 of the first bus bar 500 protrude from the non-overlapping portion 512 to the side opposite the second portion 712, and are provided in plurality (four) so as to be aligned at intervals in the left-right direction. In the non-overlapping portion 512, a plurality of openings 513 are formed adjacent to the connection terminal portions 520 and through which the external terminals 2a are passed, aligned so as to be aligned in the left-right direction. The second portion 712 of the insulating member 700 does not overlap the plurality of connection terminal portions 520.

[0080] According to this configuration, when the external terminal 2a is passed through the opening 513 and connected to the connection terminal portion 520, the second portion 712 of the insulating member 700 is unlikely to interfere with this connection work.

[0081] Furthermore, even if the second portion 712 is configured so as not to overlap the connection terminal portion 520 in this manner, the vertical dimension of the second portion 712 is unlikely to become large in order to increase the creepage distance D, and therefore the vertical dimension of the non-overlapping portion 512 is unlikely to become large, and the first bus bar 500 is unlikely to become large.

[0082] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and application examples of the present invention can be modified in various ways in addition to the above embodiment.

[0083] For example, in the above embodiment, the two first ribs 717 and the two second ribs 718 connecting the first ribs 717 are formed in the second portion 712 of the insulating member 700. However, as shown in Fig. 9(a) , the two second ribs 718 do not necessarily have to be formed in the second portion 712 of the insulating member 700.

[0084] In the above embodiment, two first ribs 717 are formed on the second portion 712 of the insulating member 700. However, the number of the first ribs 717 can be changed as appropriate. For example, in order to ensure a creepage distance D of the same length as that of the above embodiment, as shown in FIG. 9(b), three first ribs 717a that are lower in height (protrusion amount) than the two first ribs 717 arranged vertically and have the same length may be formed on the second portion 712. The left and right ends of these three first ribs 717a are connected by a second rib 718a. Alternatively, as shown in FIG. 9(c), one first rib 717b that is higher in height than the two first ribs 717 and has the same length may be formed on the second portion 712. The more the number of first ribs, the lower the height can be, so that the film capacitor 1 is less likely to interfere with surrounding components when installed in an external device, and the fewer the number of first ribs, the simpler the structure of the second portion 712 is, so that the insulating member 700 is easier to manufacture.

[0085] Furthermore, in the above embodiment, the first bus bar 500 is configured such that the four connection terminal portions 520 protrude from the non-overlapping portion 512 to the side opposite to the second portion 712 of the insulating member 700 (front side). However, the number of the connection terminal portions 520 can be changed as appropriate. When the number of the connection terminal portions 520 is changed, the number of the openings 513 is changed accordingly. In addition, the formation positions and protruding directions of the connection terminal portions 520 in the non-overlapping portion 512 can also be changed as appropriate. For example, the connection terminal portions 520 may protrude from the non-overlapping portion 512 to the second portion 712 side (rear side). In addition, the connection terminal portions 520 may protrude upward, left or right from the upper end, left end or right end of the non-overlapping portion 512.

[0086] Furthermore, in the above embodiment, first overlapping portion 511 and non-overlapping portion 512 of first bus bar 500 have the same width in the left-right direction. However, first overlapping portion 511 and non-overlapping portion 512 may have different widths in the left-right direction.

[0087] Furthermore, the shapes of the first overlapping portion 511 and non-overlapping portion 512 of the first busbar 500 and the second overlapping portion 611 of the second busbar 600 do not have to be rectangular as in the above embodiment, and may be any suitable shape.

[0088] Furthermore, in the above embodiment, the film capacitor 1 is provided with one capacitor element 400. However, the number of capacitor elements 400 may be two or more, and may be changed as appropriate.

[0089] Furthermore, in the above embodiment, capacitor element 400 is formed by stacking two metallized films having aluminum vapor-deposited on a dielectric film, and then rolling or laminating the stacked metallized films. Alternatively, capacitor elements 400 may be formed by stacking a metallized film having aluminum vapor-deposited on both sides of a dielectric film and an insulating film, and then rolling or laminating the stacked metallized films.

[0090] Furthermore, in the above embodiment, the film capacitor 1 is given as an example of the capacitor of the present invention. However, the present invention can be applied to capacitors other than the film capacitor 1.

[0091] In addition, the embodiments of the present invention can be modified in various ways as appropriate within the scope of the technical ideas set forth in the claims.

[0092] In addition, in the description of the above embodiment, terms indicating directions such as "upper" and "lower" indicate relative directions that depend only on the relative positional relationship of the components, and do not indicate absolute directions such as the vertical direction or the horizontal direction. [Industrial Applicability]

[0093] The present invention is useful for capacitors used in various electronic devices, electric devices, industrial devices, vehicle electrical equipment, and the like. [Explanation of symbols]

[0094] 1. Film capacitor (capacitor) 400 Capacitor element 500 1st bus bar 511 First Polymerization Section 512 Non-polymerized part 513 Opening 520 Connection terminal 600 2nd bus bar 611 Second Polymerization Section 700 Insulating materials 711 Part 1 712 Part 2 717 First rib (protruding part) 718 Second rib (connection part)

Claims

1. A capacitor element; a first bus bar and a second bus bar connected to the capacitor element; an insulating member disposed between the first bus bar and the second bus bar, the first bus bar includes a first overlapping portion, the second bus bar includes a second overlapping portion, The first polymerization portion and the second polymerization portion overlap each other, the insulating member is disposed between the first overlapping portion and the second overlapping portion, The first bus bar is A non-polymerization portion that is continuous with the first polymerization portion and does not overlap with the second polymerization portion; a connection terminal portion protruding from the non-overlapping portion and connected to an external terminal, The insulating member is A first portion interposed between the first polymerization portion and the second polymerization portion; A second portion continuous with the first portion and overlapping the non-overlapping portion; a protruding portion protruding from the second portion to a side opposite to the non-overlapping portion, The protruding portion extends in a second direction perpendicular to a first direction in which the first overlapping portion and the non-overlapping portion are aligned. A capacitor characterized by:

2. 2. The capacitor according to claim 1, The protrusion is composed of a plurality of protrusions arranged at intervals in the first direction. A capacitor characterized by:

3. 3. The capacitor according to claim 2, The insulating member includes a connecting portion that connects the plurality of protrusions. A capacitor characterized by:

4. The capacitor according to claim 3, The connecting portion is provided outside a range where the non-overlapping portion and the second overlapping portion overlap in the second direction. A capacitor characterized by:

5. The capacitor according to any one of claims 1 to 4, the connection terminal portion includes a plurality of connection terminal portions protruding from the non-overlapping portion to a side opposite the second portion and arranged at intervals in the second direction, a plurality of openings, through which the external terminals are passed, are formed in the non-overlapping portion and adjacent to the connection terminal portion, and are aligned in the second direction; The second portion does not overlap the plurality of connection terminal portions. A capacitor characterized by:

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