Capacitor

Abstract

To provide a capacitor in which a gap between a peripheral surface of a capacitor element and a facing part of a bus bar facing the peripheral surface can be maintained at a constant width.SOLUTION: A film capacitor 1 includes: a capacitor element 100 including a first electrode 110 formed on one end surface, a second electrode 120 formed on the other end surface, and a peripheral surface 130 connecting the first electrode 110 and the second electrode 120 to each other; a first bus bar 200 and a second bus bar 300 connected to the first electrode 110 and the second electrode 120, respectively; a case 20 in which the capacitor element 100 is housed; and a filling resin 30 which is filled in the case 20, and in which the capacitor element 100 and one part of the first bus bar 200 and the second bus bar 300 are embedded. The peripheral surface 130 includes a first flat surface 131, and the first bus bar 200 includes a flat plate-shaped first relay portion 220 facing the flat surface. The first relay portion 220 includes a protrusion part 221 protruding toward the first plane 131 and abutting on the first plane 131.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a capacitor.

Background Art

[0002] A capacitor in which a capacitor element unit having a bus bar connected to an electrode of a capacitor element is housed in a case and the case is filled with a filling resin, and the bus bar is configured to include a portion facing the peripheral surface of the capacitor element is described in, for example, Patent Document 1.

[0003] In the film capacitor of Patent Document 1, the lower bus bar includes a relay portion as a portion facing the peripheral surface of the capacitor element. The relay portion extends upward along the peripheral surface of the capacitor element from an end of a lower electrode terminal portion connected to the lower end face electrode of the capacitor element. A gap is formed between the capacitor element, the peripheral surface, and the relay portion, and the filling resin has entered the gap. The filling resin is injected into the case in a liquid phase state and then cured in the case. The peripheral surface of the capacitor element and the relay portion are adhered to each other by the filling resin.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the film capacitor of Patent Document 1 described above, it is difficult to maintain a constant width of the gap between the peripheral surface of the capacitor element and the relay portion. Therefore, when the width of the gap becomes small, the thickness of the filling resin that has entered the gap becomes thin, and peeling is likely to occur between the peripheral surface and the filling resin or between the relay portion and the filling resin. Further, when the width of the gap becomes small, the liquid-phase filling resin does not sufficiently enter the gap, and voids are likely to occur in the cured filling resin that has entered the gap. As a result, moisture is likely to penetrate into the peeled portion and the voids, and there is a risk that the moisture resistance of the film capacitor will decrease.

[0006] Therefore, an object of the present invention is to provide a capacitor capable of maintaining a constant width of the gap between the peripheral surface of a capacitor element and the opposing portion of a bus bar facing the peripheral surface.

Means for Solving the Problems

[0007] A first aspect of the present invention relates to a capacitor. The capacitor according to this aspect includes a capacitor element including a first electrode formed on one end face, a second electrode formed on the other end face, and a peripheral surface connecting the first electrode and the second electrode, a first bus bar and a second bus bar respectively connected to the first electrode and the second electrode, a case in which the capacitor element is housed, and a filling resin filled in the case and in which the capacitor element and a part of the first bus bar and the second bus bar are buried. Here, the peripheral surface includes a flat surface, and the first bus bar includes a flat opposing portion facing the flat surface. The opposing portion includes a protruding portion that protrudes toward the flat surface side and abuts against the flat surface.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide a capacitor capable of maintaining a constant width of the gap between the peripheral surface of a capacitor element and the opposing portion of a bus bar facing the peripheral surface.

[0009] The effects and significance of the present invention will become more apparent from the following description of the embodiments, however, the embodiments shown below are merely examples of how the present invention can be put into practice, and the present invention is not limited to the embodiments described below. [Brief explanation of the drawings]

[0010]

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Figure 14

BEST MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, a film capacitor, which is an embodiment of the capacitor of the present invention, will be described with reference to the drawings. For convenience, an X-axis, a Y-axis, and a Z-axis orthogonal to each other are appended to each drawing.

[0012] <Embodiment 1> The film capacitor 1 according to Embodiment 1 will be described. The film capacitor 1 is a so-called case-molded type capacitor.

[0013] FIG. 1 is a perspective view of the film capacitor 1. FIG. 2 is a cross-sectional view of the film capacitor 1 cut parallel to the XZ plane at the center in the Y-axis direction. In FIG. 2, for convenience, the filling resin 30 is shown in a transparent state.

[0014] The film capacitor 1 includes a capacitor element module 10, a case 20, and a filling resin 30. The capacitor element module 10 is housed in the case 20, and the case 20 is filled with the filling resin 30.

[0015] The filling resin 30 is a thermosetting resin such as an epoxy resin. The filling resin 30 is an exterior body that covers the capacitor element module 10 in the case 20. The portion of the capacitor element module 10 buried in the filling resin 30 is protected from moisture and impact by the case 20 and the filling resin 30.

[0016] Figures 3 and 4 are perspective views of the capacitor element module 10. Figure 5 is a cross-sectional view of the capacitor element module 10 cut parallel to the XY plane at a position on the negative Z-axis side of the insulating member 400. Figure 6 is a perspective view of the first bus bar 200. Figure 7 is a perspective view of the second bus bar 300. Figure 8(a) is a cross-sectional view of the main part of the first bus bar 200 cut at the position of the first joint 231, showing the vicinity of the first joint terminal part 230. Figure 8(b) is a cross-sectional view of the main part of the second bus bar 300 cut at the position of the second joint 331, showing the vicinity of the second joint terminal part 330. Figures 9(a) and (b) are perspective views of the insulating member 400.

[0017] The capacitor element module 10 includes four capacitor elements 100, a first bus bar 200, a second bus bar 300, and an insulating member 400.

[0018] The capacitor element 100 is formed into a shape close to a flat oblong cylinder by stacking two metallized films with aluminum vapor-deposited on a dielectric film, winding or laminating the stacked metallized films, and pressing them. On one end face of the capacitor element 100, a first electrode 110 is formed by spraying a metal such as zinc, and on the other end face, a second electrode 120 is formed by spraying the same metal such as zinc.

[0019] The capacitor element 100 has a peripheral surface 130 connecting the first electrode 110 and the second electrode 120. The peripheral surface 130 includes two first planes 131 arranged in the X-axis direction, which is the short side direction of the capacitor element 100, two second planes 132 arranged in the Y-axis direction, which is the long side direction of the capacitor element 100, and four arc surfaces 133 existing between the first plane 131 and the second plane 132. The dimension of the first plane 131 in the Y-axis direction is larger than the dimension of the second plane 132 in the X-axis direction.

[0020] Note that the capacitor element 100 of the present embodiment is formed by a metallized film obtained by depositing aluminum on a dielectric film. However, it may also be formed by a metallized film obtained by depositing other metals such as zinc and magnesium. Alternatively, the capacitor element 100 may be formed by a metallized film obtained by depositing a plurality of these metals, or may be formed by a metallized film obtained by depositing an alloy of these metals.

[0021] The four capacitor elements 100 are arranged in two rows each in the X-axis direction and the Y-axis direction so that the peripheral surfaces 130 face each other. In each capacitor element 100, the first electrode 110 faces the negative Z-axis direction, and the second electrode 120 faces the positive Z-axis direction.

[0022] The first bus bar 200 is formed by appropriately cutting and bending a conductive material, for example, a copper plate, and has a configuration in which the first electrode terminal portion 210, the first relay portion 220, and the first bonding terminal portion 230 are integrated.

[0023] The first electrode terminal portion 210 has a substantially rectangular flat plate shape that is long in the Y-axis direction. Two corner portions of the first electrode terminal portion 210 in the positive X-axis direction are formed into large arcs. A substantially U-shaped notch portion 211 is formed at the end of the first electrode terminal portion 210 in the positive X-axis direction at the center.

[0024] The first relay portion 220 relays between the first electrode terminal portion 210 and the first bonding terminal portion 230. The first relay portion 220 has a substantially rectangular flat plate shape that is long in the Y-axis direction, and extends in the positive Z-axis direction perpendicular to the first electrode terminal portion 210 from the end of the first electrode terminal portion 210 in the negative X-axis direction. The dimension of the first relay portion 220 in the Z-axis direction is larger than the dimension of the capacitor element 100 in the Z-axis direction, that is, the dimension in the direction in which the first electrode 110 and the second electrode 120 are arranged.

[0025] At the first relay part 220, two protrusions 221 are provided at two positions on the positive Y-axis side and the negative Y-axis side on the surface in the positive X-axis direction side, and are located closer to the first electrode terminal part 210 side than the center in the Z-axis direction, such that the two protrusions 221 are arranged in the Y-axis direction. The four protrusions 221 have a flat and substantially columnar shape, and protrude in the positive X-axis direction from the surface on the positive X-axis direction side of the first relay part 220. The tip surface 221a of each protrusion 221 has a flat shape, and the outer peripheral edge of the tip surface 221a is chamfered in an arc shape. Further, at the positive Y-axis side end and the negative Y-axis side end of the first relay part 220, in the vicinity of the first bonding terminal part 230, first protruding pieces 222 protruding in the positive Y-axis direction and the negative Y-axis direction are respectively formed.

[0026] The first bonding terminal part 230 has a substantially rectangular flat plate shape elongated in the Y-axis direction, and extends in the negative X-axis direction perpendicular to the first relay part 220 from the positive Z-axis direction end of the first relay part 220. On the inner part of the surface of the first bonding terminal part 230, first bonding parts 231 where welding is performed when external terminals are bonded are set at two positions side by side in the Y-axis direction. And on the surface of the first bonding terminal part 230, as an indicating part for indicating the area of each first bonding part 231, a substantially rectangular annular first groove part 232 for indicating the boundary between the area of the first bonding part 231 and the other area is provided.

[0027] As shown in FIG. 8(a), the first groove part 232 has, for example, a V-shaped cross section. The first groove part 232 may have a cross-sectional shape other than V-shaped, such as a semi-circle, a U-shape, or a rectangle. The thickness D1 of the first bonding terminal part 230 at the part of each first groove part 232 is smaller than the thickness D2 at the part of each first bonding part 231.

[0028] The second bus bar 300 is formed by appropriately cutting and bending a conductive material, for example, a copper plate, and has a configuration in which a second electrode terminal part 310, a second relay part 320, and a second bonding terminal part 330 are integrated.

[0029] The second electrode terminal 310 has a generally rectangular flat plate shape that is long in the Y-axis direction, and the end 310a on the negative X-axis side (the second relay portion 320 side) is one step higher in the Z-axis direction. The two corners of the second electrode terminal 310 in the positive X-axis direction are formed into large arcs. A generally semicircular notch 311 is formed in the center of the end of the second electrode terminal 310 in the positive X-axis direction.

[0030] The second link portion 320 provides a relay between the second electrode terminal 310 and the second connecting terminal 330. The second link portion 320 has a generally rectangular flat plate shape that is elongated in the Y-axis direction, and extends in the Z-axis positive direction perpendicular to the second electrode terminal 310 from the end of the second electrode terminal 310 in the X-axis negative direction. Second protruding pieces 321 that protrude in the Y-axis positive direction and the Y-axis negative direction are formed on the end of the second link portion 320 on the Y-axis positive side and the Y-axis negative side, respectively.

[0031] Second connecting terminal portion 330 has a generally rectangular flat plate shape that is elongated in the Y-axis direction, and extends in the X-axis positive direction from the end of second relay portion 320 in the Z-axis positive direction perpendicular to second relay portion 320. Second connecting portions 331, to which welding is performed when joining external terminals, are set in two positions aligned in the Y-axis direction on the inner part of the surface of second connecting terminal portion 330. Second connecting portions 331 are welded when joining external terminals. Second connecting terminal portion 330 has generally rectangular annular second groove portions 332 on its surface as identifying portions that identify the areas of each second connecting portion 331, and that identify the boundaries between the areas of second connecting portions 331 and other areas.

[0032] 8(b), the second groove 332 has, for example, a V-shaped cross section. The second groove 332 may have a cross-sectional shape other than a V-shape, such as a semicircular, U-shaped, or rectangular shape. The second connecting terminal 330 has a thickness D3 at each second groove 332 which is smaller than a thickness D4 at each second connecting portion 331.

[0033] Insulating member 400 is made of an electrically insulating material such as polyphenylene sulfide (PPS) and has a generally rectangular flat plate shape that is elongated in the Y-axis direction. Insulating member 400 has a first surface 400a on the negative X-axis side and a second surface 400b on the positive X-axis side, on which a first recess 410 and a second recess 420 that are generally rectangular and elongated in the Y-axis direction are formed, respectively, relative to these surfaces. First recess 410 has a passage 411 at its end on the positive Y-axis side that extends to the end of insulating member 400 on the negative Z-axis side.

[0034] The insulating member 400 has holding portions 430 at both ends in the Y-axis direction. Each holding portion 430 has a first fitting groove 431 on the first surface 400a side that opens in the negative Z-axis direction and the Y-axis direction, and a second fitting groove 432 on the second surface 400b side that opens in the positive Z-axis direction and the Y-axis direction. Furthermore, the insulating member 400 has a canopy portion 440 extending in the negative X-axis direction at the end in the positive Z-axis direction.

[0035] In the capacitor element module 10, the first electrode terminal portion 210 of the first bus bar 200 contacts the first electrodes 110 of the four capacitor elements 100 from the negative Z-axis direction side. The first electrode terminal portion 210 and the four first electrodes 110 are joined by a joining method such as welding or soldering. In this way, the first bus bar 200 is electrically connected to the four first electrodes 110.

[0036] The second electrode terminal portions 310 of the second bus bar 300 contact the second electrodes 120 of the four capacitor elements 100 from the positive side in the Z axis direction. A gap exists between the end portions 310a of the second electrode terminal portions 310 and the second electrodes 120. The second electrode terminal portions 310 and the four second electrodes 120 are joined by a joining method such as welding or soldering. In this way, the second bus bar 300 is electrically connected to the four second electrodes 120.

[0037] The first relay portion 220 of the first bus bar 200 faces the first plane 131 of the peripheral surfaces 130 of the two capacitor elements 100 on the negative X-axis side as the opposing portion included in the first bus bar 200, across the entirety between the first electrode 110 and the second electrode 120, from the negative X-axis side. The tip surfaces 221a of the two protrusions 221 on the positive Y-axis side of the first relay portion 220 contact the first plane 131 of the capacitor element 100 on the positive Y-axis side at a position closer to the first electrode 110 than the second electrode 120. Similarly, the tip surfaces 221a of the two protrusions 221 on the negative Y-axis side of the first relay portion 220 contact the first plane 131 of the capacitor element 100 on the negative Y-axis side at a position closer to the first electrode 110 than the second electrode 120.

[0038] The portion of the insulating member 400 on the positive Z-axis side is interposed between the first relay portion 220 of the first bus bar 200 and the second relay portion 320 of the second bus bar 300 in a state of being in contact with these. Also, the portion of the insulating member 400 on the negative Z-axis side is interposed between the first relay portion 220 of the first bus bar 200 and the first plane 131 of the two capacitor elements 100 on the negative X-axis side in a state of being in contact with these. Thereby, insulation between the first relay portion 220, the second relay portion 320, and the second electrode 120 is ensured.

[0039] The thickness D5 of the insulating member 400 is made equal to the protruding length D6 of the four protrusions 221 of the first relay portion 220 (see FIG. 2). Thereby, the first plane 131 of the two capacitor elements 100 and the first relay portion 220 become parallel. A uniform gap S with a constant width (the width corresponding to the thickness D5 and the protruding length D6) is ensured between the first plane 131 of the two capacitor elements 100 and the first relay portion 220. Since the distance between the two capacitor elements 100 and the first relay portion 220 is maintained constant, that is, the variation in the distance is suppressed, the electrical characteristics of the film capacitor 1 are less likely to vary.

[0040] The first protruding piece 222 of the first relay part 220 is fitted into the first fitting groove 431 of the holding part 430 of the insulating member 400 from the negative Z-axis direction side, and the first joining terminal part 230 abuts against the eaves part 440 of the insulating member 400 from the negative Z-axis direction side. The second protruding piece 321 of the second relay part 320 is fitted into the second fitting groove 432 of the holding part 430 of the insulating member 400 from the negative Z-axis direction side, and the second joining terminal part 330 abuts against the holding part 430 from the positive Z-axis direction side. As a result, the three members of the first bus bar 200, the second bus bar 300, and the insulating member 400 are less likely to separate in the Z-axis direction, the Y-axis direction, and the Z-axis direction.

[0041] FIG. 10 is a perspective view of the case 20.

[0042] The case 20 is formed of a resin material, for example, a thermoplastic resin such as polyphenylene sulfide (PPS). The case 20 may be formed of a thermosetting resin such as an epoxy resin.

[0043] The case 20 has a substantially rectangular parallelepiped box shape, and includes a substantially rectangular opening 21, a substantially rectangular bottom surface portion 22 facing the opening 21, first side surface portions 23 and 24 that are substantially rectangular and extend from both end portions on the X-axis direction side of the bottom surface portion 22 toward the opening 21 (positive Z-axis direction) and face each other, and third side surface portions 25 and 26 that are rectangular and extend from both end portions on the Y-axis direction side of the bottom surface portion 22 toward the opening 21 (positive Z-axis direction) and face each other.

[0044] Mounting tabs 27 are provided on the first side surface portion 23, the third side surface portion 25, and the fourth side surface portion 26. Insertion holes 27a are formed in each mounting tab 27. A metal collar 27b is fitted into the insertion hole 27a to increase the strength of the hole. Further, positioning tabs 28 are provided on the third side surface portion 25 and the fourth side surface portion 26. Each positioning tab 28 has a positioning pin 28a that protrudes toward the bottom surface portion 22 side. When the film capacitor 1 is installed in the installation portion of an external device, the mounting tab 27 is fixed to the installation portion with a screw or the like. At this time, in order to position the film capacitor 1 with respect to the installation portion, the positioning pin 28a is inserted into a positioning hole provided in the installation portion.

[0045] In the case 20, the capacitor element module 10 is arranged such that the first electrodes 110 of the four capacitor elements 100 face the bottom surface portion 22 of the case 20. The first relay portion 220 of the first bus bar 200 extends from the bottom surface portion 22 side toward the opening portion 21 side along the second side surface portion 24 of the case 20, is led out from the casting surface 31 of the filling resin 30 to the outside of the filling resin 30, and the first joining terminal portion 230 of the first bus bar 200 is exposed from the filling resin 30. Also, the second relay portion 320 of the second bus bar 300 is led out from the casting surface 31 to the outside of the filling resin 30, and the second joining terminal portion 330 of the second bus bar 300 is exposed from the filling resin 30.

[0046] When the film capacitor 1 is assembled, first, an accommodation process is performed, and the capacitor element module 10 is accommodated in the case 20 through the opening portion 21. The capacitor element module 10 is positioned at a predetermined position in the case 20 by a positioning jig.

[0047] Next, a resin injection process is performed, and the liquid-phase filling resin 30 is injected into the case 20 through the opening portion 21 and filled up to a position close to the opening portion 21. The first joining terminal portion 230 of the first bus bar 200 and the second joining terminal portion 330 of the second bus bar 300 are exposed from the liquid surface of the liquid-phase filling resin 30 that becomes the casting surface 31 after curing.

[0048] A gap S with a certain width is ensured between the first plane 131 of the two capacitor elements 100 on the negative X-axis side and the first relay portion 220 of the first bus bar 200 by the insulating members 400 and the four protrusions 221. Therefore, the injected filling resin 30 can easily enter the gap S, and the gap S is sufficiently filled with the filling resin 30 so that air hardly remains in the gap S. In particular, the filling resin 30 enters the gap S not only from both sides in the Y-axis direction of the first relay portion 220, but also, as shown by the dashed arrow in Fig. 2, through the gap between the end 310a of the second electrode terminal portion 310 of the second bus bar 300 and the second electrodes 120 of the two capacitor elements 100 on the negative X-axis side and the gap between the two second electrodes 120, so that the filling resin 30 can easily spread in the gap S.

[0049] Also, the injected filling resin 30 enters the first concave portion 410 and the second concave portion 420 of the insulating member 400, and the first concave portion 410 and the second concave portion 420 are filled with the filling resin 30.

[0050] Furthermore, in the capacitor element module 10, the notch portion 211 of the first electrode terminal portion 210 of the first bus bar 200 and the notch portion 311 of the second electrode terminal portion 310 of the second bus bar 300 are provided so as to coincide with the space generated in the central portion of the four capacitor elements 100 (see Figs. 3 and 4). Therefore, the injected filling resin 30 can easily spread between the capacitor element module 10 and the bottom surface portion 22 of the case 20 through the two notch portions 211, 311 and the central space.

[0051] When the case 20 is filled with the filling resin 30, a resin curing process is performed, the inside of the case 20 is heated, and the filling resin 30 is heated. As a result, the filling resin 30 cures inside the case 20. The filling resin 30 becomes an exterior body that covers the capacitor element module 10.

[0052] In this way, the film capacitor 1 as shown in Fig. 1 is completed.

[0053] The peripheral surfaces 130 of the two capacitor elements 100 on the negative side of the X axis are bonded to the first relay portion 220 by the filling resin 30 present in the gap S. Since the filling resin 30 present in the gap S has a constant thickness, peeling does not occur between the peripheral surfaces 130 of the capacitor elements 100 and the filling resin 30 or between the first relay portion 220 and the filling resin 30. Furthermore, because the gap S is less likely to narrow, voids are less likely to form in the filling resin 30 present in the gap S. This reduces the risk of moisture penetration into the peeled portions or voids, thereby improving the moisture resistance of the film capacitor 1. Furthermore, the filling resin 30 in the first recess 410 bonds the first relay portion 220 to the insulating member 400, and the filling resin 30 in the second recess 420 bonds the second relay portion 320 to the insulating member 400. This makes it difficult for moisture to penetrate between the first relay portion 220 and the insulating member 400 and between the second relay portion 320 and the insulating member 400, further improving the moisture resistance of the film capacitor 1.

[0054] When liquid-phase filling resin 30 is injected into case 20 during the resin injection process, air may be entrained, generating numerous air bubbles in the liquid-phase filling resin 30 inside case 20. These air bubbles may burst near the liquid surface, causing resin to splash from the liquid surface, and the splashed resin may adhere to the first bonding portion 231 of first bonding terminal 230 and the second bonding portion 331 of second bonding terminal 330, which are located near the liquid surface. Furthermore, there is a risk that foreign matter such as dust may adhere to the first bonding portion 231 and the second bonding portion 331 during various processes until the film capacitor 1 is completed.

[0055] When external terminals are joined to the first connecting terminal portion 230 and the second connecting terminal portion 330, welding is performed within the areas of the first connecting portion 231 and the second connecting portion 331. For this reason, if foreign matter such as resin or dust adheres to the first connecting portion 231 or the second connecting portion 331 in the completed film capacitor 1, it may interfere with the welding.

[0056] Therefore, in the completed film capacitor 1, an inspection is performed to check whether foreign matter adheres to the first joint portion 231 and the second joint portion 331. In the film capacitor 1 of the present embodiment, on the surface of the first joint terminal portion 230, the boundary between the region of the first joint portion 231 and the other regions is indicated by a first groove portion 232 which is an indicating portion. Similarly, on the surface of the second joint terminal portion 330, the boundary between the region of the second joint portion 331 and the other regions is indicated by a second groove portion 332 which is an indicating portion. For this reason, the inspector can easily grasp the first joint portion 231 and the second joint portion 331, and can easily perform the inspection for the presence or absence of foreign matter adhesion. Then, the inspector can easily detect foreign matter, particularly resin adhesion, to the first joint portion 231 and the second joint portion 331.

[0057] The film capacitor 1 is mounted on an external device. The external device is provided with an external terminal T1 corresponding to the first joint terminal portion 230 of the first bus bar 200 and an external terminal T2 corresponding to the second joint terminal portion 330 of the second bus bar 300. The external terminal T1 is joined to the first joint terminal portion 230 by welding, and the external terminal T2 is joined to the second joint terminal portion 330 by welding.

[0058] FIG. 11 is a plan view of the film capacitor 1 in a state where the external terminals T1 and T2 are joined to the first joint terminal portion 230 and the second joint terminal portion 330.

[0059] The external terminal T1 is overlapped on the surface of the first joint terminal portion 230 so as to cover the two first joint portions 231. The joint surface of the external terminal T1 that contacts the first joint terminal portion 230 is flat. Similarly, the external terminal T2 is overlapped on the surface of the second joint terminal portion 330 so as to cover the two second joint portions 331. The joint surface of the external terminal T2 that contacts the second joint terminal portion 330 is flat.

[0060] Welding (such as laser welding, resistance welding, etc.) using welding equipment is performed within the regions of each of the first joint portions 231 and each of the second joint portions 331. Thereby, the external terminal T1 is joined to the first joint terminal portion 230, and the external terminal T2 is joined to the second joint terminal portion 330.

[0061] The actual welding portion P has a shape that is long in the longitudinal direction (Y-axis direction) of the first joining terminal portion 230 and the second joining terminal portion 330. Therefore, in order to correspond to the shape of the welding portion P, each of the first joining portions 231 and each of the second joining portions 331 has a substantially rectangular shape. Further, due to assembly tolerances, member tolerances, etc. in the film capacitor 1, there is a possibility that the position of the welding portion P may shift slightly. Therefore, in consideration of the displacement of the welding portion P, the sizes of each of the first joining portions 231 and each of the second joining portions 331 are made larger than the size of the welding portion P. Note that if the shape of the welding portion P is changed, the shapes of each of the first joining portions 231 and each of the second joining portions 331 can be changed accordingly.

[0062] The indicating portion that indicates each of the first joining portions 231 is the first groove portion 232, and it does not protrude from the surface of the first joining terminal portion 230. Therefore, the contact of the joining surface of the external terminal T1 with the surface of the first joining terminal portion 230 is not obstructed by the indicating portion. Further, in the first joining terminal portion 230, the thickness D1 at the portion of each of the first groove portions 232 is smaller than the thickness D2 at the portion of each of the first joining portions 231 (see Fig. 8(a)). For this reason, heat is less likely to propagate in the portion of each of the first groove portions 232, so the heat generated at each of the first joining portions 231 during welding is less likely to escape from each of the first joining portions 231. Therefore, welding can be efficiently performed at each of the first joining portions 231.

[0063] Similarly, the indicating portion that indicates each of the second joining portions 331 is the second groove portion 332, and it does not protrude from the surface of the second joining terminal portion 330. Therefore, the contact of the joining surface of the external terminal T2 with the surface of the second joining terminal portion 330 is not obstructed by the indicating portion. Further, in the second joining terminal portion 330, the thickness D3 at the portion of each of the second groove portions 332 is smaller than the thickness D4 at the portion of each of the second joining portions 331 (see Fig. 8(b)). For this reason, heat is less likely to propagate in the portion of each of the second groove portions 332, so the heat generated at each of the second joining portions 331 during welding is less likely to escape from each of the second joining portions 331. Therefore, welding can be efficiently performed at each of the second joining portions 331.

[0064] Since the first joint portion 231 and the second joint portion 331 are defined by the first groove portion 232 and the second groove portion 332, it is also possible for the welding equipment to identify the areas of the first joint portion 231 and the second joint portion 331 by image recognition and perform welding.

[0065] <Effect of Embodiment 1> As described above, according to Embodiment 1, the following effects are achieved.

[0066] The film capacitor 1 includes a capacitor element 100 including a first electrode 110 formed on one end face, a second electrode 120 formed on the other end face, and a peripheral surface 130 connecting the first electrode 110 and the second electrode 120, a first bus bar 200 and a second bus bar 300 respectively connected to the first electrode 110 and the second electrode 120, a case 20 in which the capacitor element 100 is housed, and a filling resin 30 filled in the case 20 and in which the capacitor element 100 and a part of the first bus bar 200 and the second bus bar 300 are buried. The peripheral surface 130 includes a first plane 131 (plane), and the first bus bar 200 includes a flat first relay portion 220 (opposing portion) facing the plane. The first relay portion 220 includes a protrusion 221 protruding toward the first plane 131 and contacting the first plane 131.

[0067] According to this configuration, the gap S between the first plane 131 on the peripheral surface 130 of the capacitor element 100 and the first relay portion 220 of the first bus bar 200 can be maintained at a constant width by the intervention of the protrusion 221 in the gap S. Therefore, a certain thickness is ensured for the filling resin 30 present in the gap S, so that peeling is less likely to occur between the peripheral surface 130 and the filling resin 30 or between the first relay portion 220 and the filling resin 30. Also, since the gap S is less likely to become narrow, the filling resin 30 in the liquid phase state easily flows into the gap S, and voids are less likely to occur in the filling resin 30 present in the gap S. Thus, it is less likely that the moisture resistance deteriorates due to moisture intrusion into the peeled portion or voids, so the moisture resistance of the film capacitor 1 can be improved (Effect 1).

[0068] Furthermore, since the distance between the peripheral surface 130 of the capacitor element 100 and the first relay portion 220 of the first bus bar 200 is less likely to vary, the electrical characteristics of the film capacitor 1 are less likely to vary (Effect 2).

[0069] Furthermore, the first relay portion 220 faces the first plane 131 across the space between the first electrode 110 and the second electrode 120. An insulating member 400 is interposed between the first plane 131 and the first relay portion 220 on the side of the second electrode 120.

[0070] According to this configuration, not only the protrusion 221 but also the insulating member 400 can maintain the gap S at a constant width between the first plane 131 and the first relay portion 220 (Effect 3).

[0071] Furthermore, the protrusion 221 is provided at a position closer to the first electrode 110 than the second electrode 120 in the first relay portion 220.

[0072] According to this configuration, the protrusion 221 and the insulating member 400 can be arranged in a well-balanced manner in the direction in which the first electrode 110 and the second electrode 120 are aligned, so that it is easy to maintain the gap S at a constant width over the entire area between the first plane 131 and the first relay portion 220 (Effect 4).

[0073] Furthermore, the case 20 includes an opening 21, a bottom surface portion 22 facing the opening 21, and a second side surface portion 24 (side surface portion) extending from an end of the bottom surface portion 22 toward the opening 21 side. The capacitor element 100 is disposed in the case 20 such that the first electrode 110 faces the bottom surface portion 22. The first relay portion 220 extends along the second side surface portion 24 within the case 20.

[0074] When the capacitor element 100 is arranged in the case 20 such that the first electrode 110 faces the bottom surface portion 22, and the first relay portion 220 extends along the second side surface portion 24 in the case 20, the gap S between the first plane 131 and the first relay portion 220 exists at a position relatively far from the opening 21 of the case 20. Compared with the configuration in which the gap S is close to the opening 21, it becomes difficult for the filling resin 30 to enter the gap S.

[0075] However, according to this configuration, even when the gap S between the first plane 131 and the first relay portion 220 exists at a position relatively far from the opening 21 of the case 20, due to the presence of the protrusion 221 in the gap S, the filling resin 30 can easily enter the gap S. Therefore, it is possible to firmly suppress the generation of voids in the filling resin 30 existing in the gap S (Effect 5).

[0076] Furthermore, the protrusion 221 has a flat tip surface 221a that contacts the first plane 131. According to this configuration, the stress applied to the first plane 131 due to the contact of the protrusion 221 is reduced, so the capacitor element 100 is less likely to be damaged (Effect 6).

[0077] Furthermore, the first relay portion 220 is parallel to the first plane 131.

[0078] According to this configuration, the thickness of the filling resin 30 existing in the gap S between the first plane 131 and the first relay portion 220 can be made uniform, and it is possible to suppress the filling resin 30 from becoming partially thin.

[0079] Furthermore, the thickness D5 of the insulating member 400 is equal to the protruding length D6 of the protrusion 221.

[0080] According to this configuration, in the direction in which the first electrode 110 and the second electrode 120 are arranged, the first relay portion 220 and the first plane 131 are likely to be parallel (Effect 7).

[0081] Furthermore, the first relay portion 220 includes a plurality (two) of protrusions 221 arranged in a direction perpendicular to the direction in which the first electrode 110 and the second electrode 120 are arranged.

[0082] According to this configuration, in the direction perpendicular to the direction in which the first electrode 110 and the second electrode 120 are arranged, the protrusions 221 contact a plurality of locations (two locations) on the first plane 131, so that the first relay portion 220 and the first plane 131 are likely to be parallel (Effect 8).

[0083] <Embodiment 2> The film capacitor 2 according to Embodiment 2 will be described.

[0084] FIGS. 12 and 13 are cross-sectional views of the film capacitor 2. In FIG. 12, the film capacitor 2 cut along the line B-B' in FIG. 13 is shown. In FIG. 13, the film capacitor 2 cut along the line A-A' in FIG. 12 is shown. FIG. 14 is a plan view of the capacitor element module 40. In FIGS. 12 and 13, for convenience, the filling resin 60 is shown in a transparent state.

[0085] The film capacitor 2 includes a capacitor element module 40, a case 50, and a filling resin 60. The capacitor element module 40 is housed in the case 50, and the case 50 is filled with the filling resin 60.

[0086] The filling resin 60 is a thermosetting resin such as an epoxy resin. It is injected into the case 50 in a liquid phase state and cured by heating to coat the capacitor element module 40 in the case 50. The portion of the capacitor element module 40 buried in the filling resin 60 is protected from moisture and impact by the case 50 and the filling resin 60.

[0087] The capacitor element module 40 includes a capacitor element 500, a first bus bar 600, a second bus bar 700, and an insulating member 800.

[0088] The structure of the capacitor element 500 is the same as that of the capacitor element 100, and includes a first electrode 510, a second electrode 520, and a peripheral surface 530. The peripheral surface 530 includes two first flat surfaces 531, two second flat surfaces 532, and four arc surfaces 533.

[0089] The first bus bar 600 is formed by appropriately cutting and bending a conductive material, for example, a copper plate, and has a configuration in which a first electrode terminal portion 610, a first relay portion 620, and a first bonding terminal portion 230 are integrated.

[0090] The first electrode terminal portion 610 has a substantially rectangular flat plate shape that is long in the Y-axis direction. The first electrode terminal portion 610 contacts the first electrode 510 of the capacitor element 500 from the positive X-axis direction side. The first electrode terminal portion 610 and the first electrode 510 are joined by a joining method such as welding or soldering. Thereby, the first bus bar 600 is electrically connected to the first electrode 510.

[0091] The first relay portion 620 relays between the first electrode terminal portion 610 and the first bonding terminal portion 630. The first relay portion 620 has a substantially rectangular flat plate shape that is long in the Y-axis direction, and includes a first portion 620a that extends in the negative X-axis direction from the positive Z-axis end of the first electrode terminal portion 610, and a second portion 620b that extends in the positive Z-axis direction from the negative X-axis end of the first portion 620a. The first relay portion 620 faces the first flat surface 531 of the peripheral surface 530 of the capacitor element 500 as an opposing portion included in the first bus bar 600, across between the first electrode 510 and the second electrode 520, from the negative X-axis direction side.

[0092] On the first portion 620a of the first relay portion 620, two protrusions 621 are provided so as to be arranged in the Y-axis direction at a position closer to the first electrode 510 than the second electrode 520 on the surface on the negative Z-axis side. The two protrusions 621 have a substantially flat columnar shape, and protrude from the first relay portion 620 toward the first flat surface 531 of the peripheral surface 530 of the capacitor element 500 and abut on the first flat surface 531. The tip surface 621a of each protrusion 621 that abuts on the first flat surface 531 has a flat shape.

[0093] The first connection terminal portion 630 has a substantially rectangular flat plate shape elongated in the Y-axis direction, and extends in the positive X-axis direction from the positive Z-axis end of the second portion 620b of the first relay portion 620.

[0094] The second bus bar 700 is formed by appropriately cutting and bending a conductive material, for example, a copper plate, and has a configuration in which a second electrode terminal portion 710, a second relay portion 720, and a second connection terminal portion 730 are integrated.

[0095] The second electrode terminal portion 710 has a substantially rectangular flat plate shape elongated in the Y-axis direction. The second electrode terminal portion 710 contacts the second electrode 520 of the capacitor element 500 from the negative X-axis side. The second electrode terminal portion 710 and the second electrode 520 are joined by a joining method such as welding or soldering. Thereby, the second bus bar 700 is electrically connected to the second electrode 520.

[0096] The second relay portion 720 relays between the second electrode terminal portion 710 and the second connection terminal portion 730. The second relay portion 720 has a substantially rectangular flat plate shape elongated in the Y-axis direction, and extends in the positive Z-axis direction so as to be continuous from the second electrode terminal portion 710.

[0097] The second connection terminal portion 730 has a substantially rectangular flat plate shape elongated in the Y-axis direction, and extends in the negative X-axis direction from the positive Z-axis end of the second relay portion 720.

[0098] The insulating member 800 is formed of a material having electrical insulation properties such as polyphenylene sulfide (PPS), and has a flat plate shape with an L-shaped cross section elongated in the Y-axis direction. The insulating member 800 is interposed between the first relay portion 620 and the second relay portion 720 on the second electrode 120 side, and is also interposed between the first relay portion 620 and the first plane 531 of the peripheral surface 530 of the capacitor element 500. Thereby, insulation between the first relay portion 620, the second relay portion 720, and the second electrode 520 is ensured.

[0099] The thickness D7 of the insulating member 800 is made equal to the protruding length D8 of the two protruding portions 621 of the first relay portion 620 (see Fig. 12(a)). As a result, the first plane 531 of the capacitor element 500 and the first relay portion 620 are parallel. A uniform gap S with a constant width (the width corresponding to the thickness D7 and the protruding length D8) is secured between the first plane 531 and the first relay portion 620. By maintaining a constant distance between the capacitor element 500 and the first relay portion 620, that is, by suppressing the variation in the distance, the electrical characteristics of the film capacitor 2 are less likely to vary.

[0100] The case 50 is formed of a resin material, for example, a thermoplastic resin such as polyphenylene sulfide (PPS). The case 50 has a substantially rectangular parallelepiped box shape, and includes a substantially rectangular opening 51, a substantially rectangular bottom surface portion 52 facing the opening 51, substantially rectangular first side surface portions 53 and 54 that extend from both end portions on the X-axis direction side of the bottom surface portion 52 toward the opening 51 side (the positive Z-axis direction) and face each other, and rectangular third side surface portions 55 and 56 that extend from both end portions on the Y-axis direction side of the bottom surface portion 52 toward the opening 51 side (the positive Z-axis direction) and face each other.

[0101] Inside the case 50, the capacitor element module 40 is arranged such that the first electrode 510 and the second electrode 520 of the capacitor element 500 face the first side surface portion 53 and the second side surface portion 54 of the case 50, respectively. The first relay portion 620 of the first bus bar 600 extends from the first side surface portion 53 side to the second side surface portion 54 side along the opening 51 of the case 50, then bends and is led out of the filling resin 60, and the first bonding terminal portion 630 of the first bus bar 600 is exposed from the filling resin 60. Also, the second relay portion 720 of the second bus bar 700 is led out of the filling resin 60, and the second bonding terminal portion 730 of the second bus bar 700 is exposed from the filling resin 60.

[0102] The circumferential surface 530 of the capacitor element 500 and the first relay portion 620 are adhered by the filling resin 60 existing in the gap S therebetween. At this time, since a certain thickness is ensured for the filling resin 60 existing in the gap S, peeling hardly occurs between the circumferential surface 530 of each capacitor element 500 and the filling resin 60 or between the first relay portion 620 and the filling resin 60. Further, since the gap S is difficult to become narrow, voids hardly occur in the filling resin 60 existing in the gap S. Therefore, since a decrease in moisture resistance due to moisture intrusion into the peeled portion or voids hardly occurs, the moisture resistance of the film capacitor 2 can be improved.

[0103] In the film capacitor 2 of the present embodiment, the gap S between the circumferential surface 530 of the capacitor element 500 and the first relay portion 620 exists closer to the opening 51 of the case 50 than in the film capacitor 1 of the first embodiment.

[0104] The film capacitor 2 is mounted on an external device. Similar to the first embodiment, the external terminal T1 is joined to the first joining terminal portion 630 by welding, and the external terminal T2 is joined to the second joining terminal portion 730 by welding.

[0105] <Effects of Embodiment 2> According to the second embodiment, effects similar to effects 1 to 4, effects 6 to 8 of the first embodiment can be achieved.

[0106] <Modification Example> As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various modifications are possible for application examples of the present invention in addition to the above embodiments.

[0107] For example, in the above-described Embodiments 1 and 2, the first relay portions 220 and 620 of the first bus bars 200 and 600 have two protrusions 221 and 621 with respect to one capacitor element 100 and 500, but they may have one or three or more protrusions 221 and 621. When one protrusion 221 or 621 is provided, it is desirable that the protrusion 221 or 621 be formed in a shape that is long in a direction perpendicular to the direction in which the first electrodes 110 and 510 and the second electrodes 120 and 520 are arranged (Y-axis direction), for example, an elliptical columnar shape.

[0108] Furthermore, in the above-described Embodiments 1 and 2, the protrusions 221 and 621 have a columnar shape. However, the shape of the protrusions 221 and 621 may be any shape such as a prismatic shape.

[0109] Furthermore, in the above-described Embodiments 1 and 2, the protrusions 221 and 621 and the insulating members 400 and 800 are interposed in the gap S between the first planes 131 and 531 of the capacitor elements 100 and 500 and the first relay portions 220 and 620 of the first bus bars 200 and 600. However, a configuration may be adopted in which only the protrusions 221 and 621 are interposed in the gap S.

[0110] Furthermore, in the above-described Embodiments 1 and 2, the tip surfaces 221a and 621a of the protrusions 221 and 621 that contact the first planes 131 and 531 of the capacitor elements 100 and 500 are formed as flat surfaces, but they may be formed as surfaces other than flat surfaces such as arc surfaces.

[0111] Furthermore, the configurations of the first bus bars 200 and 600 and the second bus bars 300 and 700 are not limited to the configurations shown in the above-described Embodiments 1 and 2, and may be any configuration.

[0112] Furthermore, in the above-described Embodiment 1, the film capacitor 1 is provided with four capacitor elements 100. Also, in the above-described Embodiment 2, the film capacitor 2 is provided with one capacitor element 500. However, the number of the capacitor elements 100 and 500 can be appropriately changed.

[0113] Furthermore, in the above-described Embodiments 1 and 2, the capacitor elements 100 and 500 are formed by overlapping two metallized films obtained by vapor-depositing aluminum on a dielectric film and winding or laminating the overlapped metallized films. However, alternatively, the capacitor elements 100 and 500 may be formed by overlapping a metallized film obtained by vapor-depositing aluminum on both surfaces of a dielectric film and an insulating film and winding or laminating them.

[0114] Furthermore, in the above-described Embodiments 1 and 2, as an example of the capacitor of the present invention, the film capacitors 1 and 2 were cited. However, the present invention can also be applied to capacitors other than the film capacitors 1 and 2.

[0115] In addition, the embodiments of the present invention can be appropriately modified in various ways within the scope of the technical idea shown in the claims.

[0116] (Supplementary Note) By the description of the above embodiments, the following techniques are disclosed.

[0117] (Technique 1) A capacitor element including a first electrode formed on one end face, a second electrode formed on the other end face, and a peripheral surface connecting the first electrode and the second electrode, A first bus bar and a second bus bar respectively connected to the first electrode and the second electrode, A case in which the capacitor element is housed, A filling resin filled in the case and in which the capacitor element and a part of the first bus bar and the second bus bar are buried, The peripheral surface includes a flat surface, The first bus bar includes a flat plate-shaped opposing portion facing the flat surface, The opposing portion includes a protruding portion that protrudes toward the flat surface side and abuts against the flat surface, A capacitor characterized by the above.

[0118] According to this technique, the gap between the flat surface on the circumferential surface of the capacitor element and the opposing portion of the first bus bar can be maintained at a constant width by the presence of the protrusion in the gap. Therefore, since a certain thickness is ensured for the filling resin present in the gap, peeling is less likely to occur between the circumferential surface and the filling resin or between the opposing portion and the filling resin. Also, since the gap is less likely to become narrow, the filling resin in the liquid phase state easily flows into the gap, and cavities are less likely to occur in the filling resin present in the gap. Thus, since a decrease in moisture resistance due to moisture ingress into the peeled portion or cavities is less likely to occur, the moisture resistance of the capacitor can be improved.

[0119] Furthermore, since variations in the distance between the circumferential surface of the capacitor element and the opposing portion of the first bus bar are less likely to occur, variations in the electrical characteristics of the capacitor are less likely to occur.

[0120] (Technique 2) In the capacitor described in Technique 1, the opposing portion faces the flat surface across between the first electrode and the second electrode, and an insulating member is interposed between the flat surface and the opposing portion on the second electrode side. A capacitor characterized by this.

[0121] According to this technique, not only the protrusion but also the insulating member can maintain the gap between the flat surface and the opposing portion at a constant width.

[0122] (Technique 3) In the capacitor described in Technique 2, the protrusion is provided at a position closer to the first electrode than the second electrode in the opposing portion, A capacitor characterized by this.

[0123] According to this technique, the protrusion and the insulating member can be arranged in a well - balanced manner in the direction in which the first electrode and the second electrode are aligned, so it is easy to maintain the gap at a constant width across the entire area between the flat surface and the opposing portion.

[0124] (Technique 4) In the capacitor according to Technique 3, the case includes an opening, a bottom surface portion facing the opening, and side surface portions extending from an edge of the bottom surface portion toward the opening side. the capacitor element is disposed in the case such that the first electrode faces the bottom surface portion, the opposing portion extends along the side surface portion in the case, A capacitor characterized by the above.

[0125] In a configuration where the capacitor element is disposed in the case such that the first electrode faces the bottom surface portion and the opposing portion extends along the side surface portion in the case, the gap between the flat surface and the opposing portion exists at a position relatively far from the opening of the case, and compared to a configuration where the gap is closer to the opening, it becomes difficult for the filling resin to enter the gap.

[0126] However, according to this technique, even when the gap between the flat surface and the opposing portion exists at a position relatively far from the opening of the case, the presence of the protruding portion in the gap makes it easier for the filling resin to enter the gap, so that it is possible to firmly suppress the formation of voids in the filling resin existing in the gap.

[0127] (Technique 5) In the capacitor according to any one of Techniques 1 to 4, the surface of the protruding portion that contacts the flat surface is flat, A capacitor characterized by the above.

[0128] According to this technique, the stress applied to the flat surface due to the contact of the protruding portion is alleviated, so that the capacitor element is less likely to be damaged.

[0129] (Technique 6) In the capacitor according to any one of Techniques 1 to 5, the opposing portion is parallel to the flat surface, A capacitor characterized by the above.

[0130] According to this technique, the thickness of the filling resin existing in the gap between the flat surface and the opposing portion can be made uniform, and it is possible to suppress the filling resin from becoming partially thin.

[0131] (Technique 7) In the capacitor described in Technique 6, the thickness of the insulating member is made equal to the protruding length of the protruding portion, A capacitor characterized by this.

[0132] According to this technique, in the direction in which the first electrode and the second electrode are arranged, the opposing portion and the flat surface are likely to be parallel.

[0133] (Technique 8) In the capacitor described in Technique 6 or 7, the opposing portion includes a plurality of the protruding portions arranged in a direction perpendicular to the direction in which the first electrode and the second electrode are arranged, A capacitor characterized by this.

[0134] According to this technique, in the direction perpendicular to the direction in which the first electrode and the second electrode are arranged, the protruding portions abut against a plurality of locations on the flat surface, so the opposing portion and the flat surface are likely to be parallel.

Industrial Applicability

[0135] The present invention is useful for capacitors used in various electronic devices, electrical devices, industrial devices, vehicle electrical equipment, etc.

Explanation of Signs

[0136] 1, 2 Film capacitor (capacitor) 10, 40 Capacitor element module 20, 50 Case 21 Opening 22 Bottom surface portion 24 Second side surface portion (side surface portion) 30, 60 Filling resin 100, 500 Capacitor element 110, 510 First electrode 120, 520 Second electrode 130, 530 Peripheral surface 131, 531 First plane (flat surface) 200, 600 First bus bar 220, 620 First relay section (opposing section) 221, 621 Protrusion 221a, 621a Tip surface 300, 700 Second bus bar 400, 800 Insulating member

Claims

1. A capacitor element including a first electrode formed on one end face, a second electrode formed on the other end face, and a peripheral surface connecting the first electrode and the second electrode; A first bus bar and a second bus bar respectively connected to the first electrode and the second electrode; A case in which the capacitor element is housed; A filling resin filled in the case and in which the capacitor element and a part of the first bus bar and the second bus bar are buried; and The peripheral surface includes a flat surface; The first bus bar includes a flat opposing portion facing the flat surface; The opposing portion includes a protruding portion that protrudes toward the flat surface side and abuts against the flat surface. A capacitor characterized by the above.

2. In the capacitor according to Claim 1, The opposing portion faces the flat surface across the space between the first electrode and the second electrode; An insulating member is interposed between the flat surface and the opposing portion on the side of the second electrode. A capacitor characterized by the above.

3. In the capacitor according to Claim 2, The protruding portion is provided at a position closer to the first electrode than the second electrode in the opposing portion. A capacitor characterized by the above.

4. In the capacitor according to Claim 3, The case includes an opening, a bottom surface portion facing the opening, and a side surface portion extending from an edge of the bottom surface portion toward the opening side; The capacitor element is disposed in the case such that the first electrode faces the bottom surface portion; The opposing portion extends along the side surface portion in the case. A capacitor characterized by the above.

5. In the capacitor according to Claim 1, The surface of the protruding portion that abuts against the flat surface is flat. A capacitor characterized by the above.

6. In the capacitor according to any one of Claims 1 to 5, The opposing portion is parallel to the flat surface. A capacitor characterized by the above.

7. In the capacitor according to Claim 6, The thickness of the insulating member is equal to the protruding length of the protruding portion. A capacitor characterized by the above.

8. In the capacitor according to Claim �, The opposing portion includes a plurality of the protruding portions arranged in a direction perpendicular to the direction in which the first electrode and the second electrode are arranged. A capacitor characterized by the above.

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