JP7634209B2 - Capacitor - Google Patents

Description

The present invention relates to a capacitor.

Patent document 1 describes a case-molded capacitor in which metallized electrodes are formed on both end faces of a capacitor element formed by laminating or rolling metallized films, bus bars are connected to each of the metallized electrodes, and portions of the pair of bus bars are overlapped with an insulating plate sandwiched between them, thereby reducing the ESL (equivalent series inductance), which is the inductance component of the bus bars.

In the case-molded capacitor of Patent Document 1, protrusions are provided on both surfaces of the insulating plate facing the pair of bus bars, and by fitting these protrusions into holes provided in the overlapping portions of the bus bars, the relative positions of the external connection terminals of the pair of bus bars are fixed, and the positions of the pair of bus bars and the insulating plate are also fixed.

JP 2010-251400 A

In the case-molded capacitor of Patent Document 1, the contact between the protrusion and the hole in the direction perpendicular to the surface of the insulating plate, i.e., in the direction in which the pair of bus bars overlap, is equal to the thickness of the flat bus bars, so the bus bars tend to move in this overlap direction, making it difficult to stably position the bus bars relative to the insulating plate.

Therefore, the present invention aims to provide a capacitor that makes it easy to stably position the bus bar relative to the insulating member.

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 arranged between the first bus bar and the second bus bar. The first bus bar includes a flat first overlapping portion, and the second bus bar includes a flat second overlapping portion, and the first overlapping portion and the second overlapping portion overlap each other. The insulating member is arranged between the first overlapping portion and the second overlapping portion, and insulates between the first overlapping portion and the second overlapping portion . At least one of the first bus bar and the second bus bar includes bent portions that bend at right angles to the overlapping portions from two opposing ends of the overlapping portion of the at least one of the first and second overlapping portions, and a through hole that is formed in the overlapping portion and contacts the bent portion. The insulating member includes a clamping portion that clamps the bent portion. The clamping portion has a first contact portion that contacts the bent portion from the outside of the at least one bus bar, and a second contact portion that passes through the through hole and contacts the bent portion from the inside of the at least one bus bar, and clamps the bent portion between the first contact portion and the second contact portion .

In addition, in the claims, the term "right angle" includes the meaning of "almost right angle."

The present invention provides a capacitor that makes it easy to stably position the bus bar relative to the insulating member.

The effects and significance of the present invention will become clearer from the description of the embodiment shown below. However, the embodiment shown below is merely an example of how the present invention can be put into practice, and the present invention is in no way limited to the embodiment described below.

FIG. 1 is a perspective view of a film capacitor according to an embodiment. 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. FIG. 3A is a perspective view of a first bus bar according to the embodiment, and FIG. 3B is a perspective view of a second bus bar according to the embodiment. 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. FIG. 5 is a front view of a main part of a capacitor element unit according to an embodiment. FIG. 6(a) is a rear view of a main part of a capacitor element unit according to the embodiment, and FIG. 6(b) is a cross-sectional view taken along line AA' of FIG. 6(a). FIG. 7 is a cross-sectional view of a mold used for injection molding of an insulating member according to an embodiment. 8(a) and 8(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. FIG. 9 is a front view of a first bus bar and an insulating member according to a modified example. FIG. 10 is a rear view of a main part of a capacitor element unit according to a modified example.

Below, a film capacitor 1, which is one embodiment of a capacitor of the present invention, will be described with reference to the figures. For convenience, each figure is appropriately indicated with the directions of front/rear, left/right, and up/down. Note that the directions shown in the figures indicate only the relative directions of the film capacitor 1, and do not indicate absolute directions. Also, for convenience of explanation, some configurations may be given names that correspond to the directions shown in the figures, such as "front" and "rear."

In this embodiment, the film capacitor 1 corresponds to the "capacitor" described in the claims. The front-rear direction, left-right direction, and up-down direction correspond to the "overlap direction," "clamping direction," and "vertical direction," respectively, described in the claims.

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.

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

The film capacitor 1 comprises a capacitor element unit 100, a case 200 in which the capacitor element unit 100 is housed, and a filling resin 300 that is filled in the case 200. The portion of the capacitor element unit 100 that is embedded in the filling resin 300, particularly the capacitor element 400, is protected from moisture and impact by the case 200 and the filling resin 300.

Figure 2(a) is an oblique view of the capacitor element unit 100 seen from above the front, and Figure 2(b) is an oblique view of the capacitor element unit 100 seen from above the rear.

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

Capacitor element 400 is formed by stacking two metallized films, each of which has 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 a first electrode 410 formed on one end face by spraying a metal such as zinc, and a second electrode 420 formed on the other end face by spraying a metal such as zinc.

In the present embodiment, the capacitor element 400 is formed from a metallized film in which aluminum is vapor-deposited onto a dielectric film, but it may also be formed from a metallized film in which other metals, such as zinc or magnesium, are vapor-deposited. Alternatively, the capacitor element 400 may be formed from a metallized film in which multiple of these metals are vapor-deposited, or from a metallized film in which an alloy of these metals is vapor-deposited.

Figure 3(a) is an oblique view of the first bus bar 500.

The first busbar 500 is formed by appropriately cutting, bending, and otherwise processing a metal plate of a conductive material of a predetermined shape, such as a copper plate.

The first busbar 500 has a main body 510 having a rectangular flat plate shape. The main body 510 is divided in the vertical direction into a portion that becomes the first overlapping portion 511 and a portion that becomes the 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. For convenience, in FIG. 3(a), the boundary between the first overlapping portion 511 and the non-overlapping portion 512 is indicated by a two-dot chain line.

At the top of the main body 510 included in the non-overlapping portion 512, a part of the main body 510 is cut and raised to form four rectangular connection terminals 520 aligned in the left-right direction. In the portion of the main body 510 where each connection terminal 520 is cut and raised, a rectangular opening 513 larger than the connection terminal 520 is formed. Each opening 513 is adjacent to the corresponding connection terminal 520 and aligned in the left-right direction.

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. In addition, 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.

A circular opening 516 is formed in the center of the lower part of the main body portion 510 included in the first overlapping portion 511.

Furthermore, the first busbar 500 includes an electrode terminal portion 530 that is bent at a right angle from the lower end of the main body portion 510 to the main body portion 510. The electrode terminal portion 530 has a rectangular plate shape that is elongated in the left-right direction.

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 is in contact with each through hole 515.

Figure 3 (b) is an oblique view of the second bus bar 600.

The second busbar 600 is formed by appropriately cutting, bending, and otherwise processing a metal plate of a conductive material of a predetermined shape, such as a copper plate.

The second busbar 600 has a main body 610 having a rectangular flat plate shape. The main body 610 is divided in the vertical direction into a portion that becomes the 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.

At the top of the main body 610 included in the second overlapping portion 611, a part of the main body 610 is cut and raised to form four rectangular connection terminal portions 620 aligned in the left-right direction. In the portion of the main body 610 where each connection terminal portion 620 is cut and raised, a rectangular opening 613 larger than the connection terminal portion 620 is formed. Each opening 613 is adjacent to the corresponding connection terminal portion 620 and aligned in the left-right direction. The four openings 613 are the same size as the four openings 514 of the first bus bar 500.

A circular opening 614 is formed in the center of the intermediate portion of the main body portion 610 included in the second overlapping portion 611.

Furthermore, the second busbar 600 includes an electrode terminal portion 630 that is bent at a right angle to the main body portion 610 from the lower end of the main body portion 610. The electrode terminal portion 630 has a rectangular plate shape that is elongated in the left-right direction.

Figure 4(a) is an oblique view of the insulating member 700 seen from above the front, and Figure 4(b) is an oblique view of the insulating member 700 seen from above the rear.

The insulating member 700 is formed by injection molding using a resin such as polyphenylene sulfide (PPS) as described below.

The insulating member 700 includes a body 710 having a substantially rectangular plate shape that is long in the left-right direction. The 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).

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

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

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 vertically with a predetermined distance between them. The predetermined distance 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.

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.

Furthermore, the insulating member 700 has 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 outside of the insulating member 700 and a second contact portion 722 located on the inside. The first contact portion 721 has a rectangular plate shape that is elongated in the vertical direction. The second contact portion 722 has a rectangular parallelepiped shape that is 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.

The first contact portion 721 includes two first ribs 721a. The two first ribs 721a are formed on the side surface of the first contact portion 721 facing the second contact portion 722 at the upper and lower positions 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 the 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.

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.

The second busbar 600 is attached to the rear side of the insulating member 700. The body 610 of the second busbar 600 contacts the rear surface 710b of the body 710 of the insulating member 700. The recess 714a of the insulating member 700 overlaps the opening 614 of the second busbar 600, and the gate mark 715 overlaps the opening 614. There may be some variation in the height of the gate mark 715. If the gate mark 715 becomes higher 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 body 610 of the second busbar 600.

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 rows of the four connection terminal portions 620 are located below the four connection terminal portions 520. The positions of the front ends of the four connection terminal portions 520 and the front ends of the four connection terminal portions 620 are aligned.

The first overlapping portion 511 of the first busbar 500 and the second overlapping portion 611 of the second busbar 600 overlap in the front-to-rear direction. The non-overlapping portion 512 of the first busbar 500 does not overlap with the second overlapping portion 611, and the non-overlapping portion 612 of the second busbar 600 does not overlap with the first overlapping portion 511. The first portion 711 of the insulating member 700 is interposed between the first overlapping portion 511 and the second overlapping portion 611. The second portion 712 of the insulating member 700 overlaps with the non-overlapping portion 512 of the first busbar 500. The third portion 713 of the insulating member 700 is interposed between the non-overlapping portion 612 of the second busbar 600 and the peripheral surface of the capacitor element 400.

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.

Figure 5 is a front view of the main parts of the capacitor element unit 100.

5, in each clamping portion 720 of the insulating member 700, the first rib 721a of the first contact portion 721 contacts the bent portion 540 from the outside of the first bus bar 500, and the second rib 722a of the second contact portion 722 that penetrates the 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 is scraped or deformed by the bent portion 540. When the first contact portion 721 and the second contact portion 722 contact the bent portion 540 from both sides, a force (a force suppressing movement) that holds the first bus bar 500 in the front-rear direction is generated in the insulating member 700.

The first bus bar 500 is positioned in the front-to-rear and left-to-right directions relative to the insulating member 700 by a positioning structure formed by the bent portion 540 and the clamping portion 720.

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

Figure 6(a) is a rear view of the main parts of the capacitor element unit 100, and Figure 6(b) is a cross-sectional view along A-A' in Figure 6(a).

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 has the same height position as the lower ends of the four openings 513 of the first bus bar 500, and the second portion 712 does not overlap the four openings 513 and the four connection terminal portions 520 in the front-to-rear direction. Note that the second portion 712 may overlap the lower ends of the four openings 513, if only slightly.

In the second portion 712 of the insulating member 700, the two first ribs 717 protrude on 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 that they are present in the overlapping range R where the non-overlapping portion 512 and 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.

As shown by the thick line in Figure 6 (b), in the vertical direction, a creepage distance D is ensured between the non-overlapping portion 512 of the first bus bar 500 and the second overlapping portion 611 of the second bus bar 600 by the second portion 712 of the insulating member 700 and the two first ribs 717. The rear side of the 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 the second portion 712 is flat.

Referring to Figure 1, the 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 box shape and has an opening 201 on the top surface.

The case 200 has mounting tabs 210 on the left and right outer surfaces and the outer bottom surface. Each mounting tab 210 has an insertion hole 211 that penetrates 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, etc., these mounting tabs 210 are fixed to the installation portion by screws or the like.

The filling resin 300 is a thermosetting resin such as epoxy resin.

The capacitor element unit 100 is accommodated in the case 200 through the opening 201. Filling resin 300 in a liquid state is injected through the opening 201 into the case 200 containing the capacitor element unit 100. The filling resin 300 fills the case 200 up to the vicinity of the opening 201, and when the injection of the filling resin 300 is completed, the case 200 is heated. This causes the filling resin 300 in the case 200 to harden. In this way, the film capacitor 1 is completed.

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 side and four external terminals 2b on the negative side, each of which is in the form of a bus bar. For example, when the first bus bar 500 is a bus bar on the positive side and the second bus bar 600 is a bus bar on the negative side, as shown in FIG. 1, the four external terminals 2a contact the four connection terminals 520 of the first bus bar 500 from the rear through the openings 513 and are connected to the connection terminals 520 by a joining method such as soldering. Furthermore, the four external terminals 2b contact the four connection terminals 620 of the second bus bar 600 from the rear through three openings 613, 716, 514 that overlap from the front to the rear and are connected to the connection terminals 620 by a joining method such as soldering.

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

Figure 7 is a cross-sectional view of a mold 800 used for injection molding of an insulating member 700. Figures 8(a) and (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, the outline of the first molding surface 811 is shown by a dashed line in Figure 8(a), and for convenience, the gate 820 is shown by a dashed line in Figure 8(b).

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

The mold 800 is formed from steel material, and is constructed 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 part 810 having the shape of the insulating member 700 is formed. The mold part 810 includes a first molding surface 811 for forming the rear surface 710b of the main body part 710 of the insulating member 700, and a second molding surface 812 for forming the front surface 710a of the main body part 710 facing away from the rear surface 710b.

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

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

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. The resin then flows radially from large gap section 815 and spreads around. This causes the entire mold section 810 to be filled with resin.

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

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 the gate mark 715. The mold 800 is then separated, and the insulating member 700 is removed from the inside.

In this way, the insulating member 700 shown in Figures 4(a) and (b) is completed. A protruding portion 714 is formed in the main body portion 710 of the insulating member 700 by filling the 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 portion 710. A gate mark 715 protruding backward is formed on the recessed surface on the back side of the protruding portion 714.

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

The first bus bar 500 includes bent portions 540 that bend at right angles to the first overlapping portion 511 from each of the opposing left and right ends of the first overlapping portion 511, and through holes 515 formed in the first overlapping portion 511 and in contact with each of the bent portions 540. The insulating member 700 includes a first contact portion 721 that contacts the bent portion 540 from the outside of the first bus bar 500, and a second contact portion 722 that passes through the through hole 515 and contacts the bent portion 540 from the inside of the first bus bar 500, and includes a clamping portion 720 that clamps each of the bent portions 540 with the first contact portion 721 and the second contact portion 722.

According to this configuration, in the front-rear direction where the first overlapping portion 511 overlaps with the insulating member 700, the range where the first contact portion 721 and the second contact portion 722 contact the bent portion 540 from both sides can be lengthened, so that the force that holds the first bus bar 500 in the front-rear direction generated in the insulating member 700 can be increased. This makes it difficult for the first bus bar 500 to move in the front-rear direction, so that the first bus bar 500 can be stably positioned in the front-rear direction relative to the insulating member 700.

In addition, the first contact portion 721 and the second contact portion 722 have a first rib 721a and a second rib 722a extending in the front-rear direction formed on the surface facing the bending portion 540, and the first rib 721a and the second rib 722a contact the bending portion 540.

According to this configuration, by pressing the bent portion 540 between the first rib 721a and the second rib 722a, the bent portion 540 can be inserted between the first contact portion 721 and the second contact portion 722 without any difficulty, and the first contact portion 721 and the second contact portion 722 can be reliably brought into contact with the bent portion 540.

Furthermore, the first contact portion 721 and the second contact portion 722 have a long shape in the vertical direction.

According to this configuration, the clamping range of the clamping portion 720 can be elongated in the vertical direction, so that the bent portion 540 can be firmly clamped by the clamping portion 720. This allows the first bus bar 500 to be stably positioned in the left-right direction relative to the insulating member 700.

Furthermore, a first contact portion 721 is formed on each of the opposing left and right ends of the insulating member 700, and the dimension of the first contact portion 721 in the left-right direction is smaller than the dimension of the second contact portion 722.

The larger the left-right dimensions of the first contact portion 721 and the second contact portion 722, the stronger the clamping portion 720 as a whole. On the other hand, when the first contact portion 721 is formed at the left and right ends of the insulating member 700, the larger the left-right dimension of the first contact portion 721, the larger the left-right dimension of the insulating member 700.

According to this configuration, the dimension of the first contact portion 721 can be made relatively small in the left-right direction, and the dimension of the second contact portion 722 can be made relatively large, thereby suppressing an increase in the left-right dimension of the insulating member 700 while suppressing a decrease in the strength of the clamping portion 720 as a whole.

Although the above describes an embodiment of the present invention, the present invention is not limited to the above embodiment, and examples of application of the present invention can be modified in various ways in addition to the above embodiment.

For example, in the above embodiment, the first rib 721a and the second rib 722a are formed on the first contact portion 721 and the second contact portion 722 of the clamping portion 720, respectively. However, as shown in FIG. 9, the first rib 721a and the second rib 722a may not be formed on the first contact portion 721 and the second contact portion 722, respectively. In this case, the gap between the first contact portion 721 and the second contact portion 722 is made equal to the thickness (dimension in the left-right direction) of the bent portion 540 of the first bus bar 500. However, in order to manufacture the first bus bar 500 and the insulating member 700 so that the gap between the first contact portion 721 and the second contact portion 722 is equal to the thickness of the bent portion 540 of the first bus bar 500, extremely high precision is required. Therefore, in order to easily manufacture the first bus bar 500 and the insulating member 700, it is desirable to form the first rib 721a and the second rib 722a on the first contact portion 721 and the second contact portion 722, respectively.

In the above embodiment, the positioning structure using the bent portion 540 and the clamping portion 720 is applied only between the first bus bar 500 and the insulating member 700. However, as shown in FIG. 10, the positioning structure using the bent portion 640 and the clamping portion 730 may also be applied between the second bus bar 600 and the insulating member 700. In this case, the second bus bar 600 is provided with a bent portion 640 that is bent at a right angle to the main body portion 610 from each of the left end and the left end of the second overlapping portion 611 of the main body portion 610. In addition, the second overlapping portion 611 is formed with a through hole 615 that contacts the bent portion 640. The insulating member 700 is provided with a clamping portion 730 at each of the left end and the right end on the rear surface 710b side of the main body portion 710.

The clamping portion 730 is composed of a first contact portion 731 having two first ribs 731a and a second contact portion 732 having one second rib 732a. The left and right bent portions 640 are clamped by the left and right clamping portions 730. This positions the second bus bar 600 in the front-rear and left-right directions relative to the insulating member 700. The clamping portion 730 may be configured in a manner similar to that shown in FIG. 9 in which the first rib 731a and the second rib 732a are not formed on the first contact portion 731 and the second contact portion 732, respectively.

Although a positioning structure using the bent portion 640 and the clamping portion 730 is applied between the second bus bar 600 and the insulating member 700, a configuration in which a positioning structure using the bent portion 540 and the clamping portion 720 is not applied between the first bus bar 500 and the insulating member 700 may also be adopted.

Furthermore, the number of first ribs 721a of the first contact portion 721 and the number of second ribs 722a of the second contact portion 722 are not limited to the numbers in the above embodiment and may be changed as appropriate.

Furthermore, in the above embodiment, the first bus bar 500 is positioned in the front-rear and left-right directions relative to the insulating member 700 by the bent portion 540 and the clamping portion 720. However, the bent portion 540 and the clamping portion 720 may be configured so that the first bus bar 500 is positioned not only in the front-rear and left-right directions relative to the insulating member 700, but also in the up-down direction. For example, by forming ribs that contact the upper and lower edges of the through hole 515 at the upper and lower ends of the second contact portion 722 of the clamping portion 720, respectively, it is possible to perform positioning in the up-down direction. Similarly, in the modified example shown in FIG. 10, the bent portion 640 and the clamping portion 730 may be configured so that the second bus bar 600 is positioned not only in the front-rear and left-right directions relative to the insulating member 700, but also in the up-down direction.

Furthermore, in the above embodiment, the vertical dimension of the first contact portion 721 is larger than the vertical dimension of the second contact portion 722, and the left-right dimension of the first contact portion 721 is smaller than the left-right dimension of the second contact portion 722. However, the vertical dimensions of the first contact portion 721 and the left-right dimensions of the second contact portion 722 may be equal to each other.

Furthermore, in the above embodiment, the bent portion 540 extends in the vertical direction from the first overlapping portion 511 to the non-overlapping portion 512. However, the bent portion 540 may not extend to the non-overlapping portion 512, and may be bent relative to the first overlapping portion 511 so as to have at least a length in the vertical direction that is sandwiched by the clamping portion 720.

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.

Furthermore, in the above embodiment, the capacitor element 400 is formed by stacking two metallized films with aluminum vapor-deposited on a dielectric film and rolling or laminating the stacked metallized films, but in addition, these capacitor elements 400 may also be formed by stacking a metallized film with aluminum vapor-deposited on both sides of a dielectric film and an insulating film, and rolling or laminating the resulting film.

Furthermore, in the above embodiment, a film capacitor 1 is given as an example of a 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 may be modified in various ways as appropriate within the scope of the technical ideas set forth in the claims.

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 vertical or horizontal.

The present invention is useful for capacitors used in various electronic devices, electrical devices, industrial equipment, vehicle electrical equipment, etc.

1. Film capacitor (capacitor)
400 Capacitor element 500 First bus bar 511 First overlapping portion 515 Through hole 540 Bent portion 600 Second bus bar 611 Second overlapping portion 700 Insulating member 720 Clamping portion 721 First contact portion 721a First rib 722 Second contact portion 722a Second rib

Claims (4)

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 flat first overlap portion,
the second bus bar includes a flat second overlap 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 and provides insulation between the first overlapping portion and the second overlapping portion ;
At least one of the first bus bar and the second bus bar is
a bent portion bent at a right angle to the overlapping portion from each of two opposing ends of the overlapping portion of at least one of the first overlapping portion and the second overlapping portion ;
A through hole formed in the overlapping portion and contacting the bent portion,
the insulating member includes a clamping portion that clamps the bent portion,
the clamping portion has a first contact portion that contacts the bent portion from an outer side of the at least one bus bar, and a second contact portion that passes through the through hole and contacts the bent portion from an inner side of the at least one bus bar, and the first contact portion and the second contact portion clamp the bent portion .
A capacitor characterized by: 2. The capacitor according to claim 1,
A first rib is formed on a surface of the first contact portion facing the bent portion, the first rib extending in a direction in which the first overlapping portion, the second overlapping portion , and the insulating member overlap,
a second rib extending in the overlapping direction is formed on a surface of the second contact portion facing the bent portion,
The first rib and the second rib contact the bent portion.
A capacitor characterized by: The capacitor according to claim 1 or 2,
Each of the first contact portion and the second contact portion has a shape in which a dimension in a direction perpendicular to an overlapping direction in which the first overlapping portion, the second overlapping portion, and the insulating member overlap and a clamping direction in which the clamping portion clamps the bent portion is longer than the dimensions in the overlapping direction and the clamping direction .
A capacitor characterized by: The capacitor according to any one of claims 1 to 3,
the first contact portion is formed at each of two opposing ends of the insulating member;
a dimension of the first contact portion is smaller than a dimension of the second contact portion in a clamping direction in which the clamping portion clamps the bent portion,
A capacitor characterized by: