Capacitors

Abstract

The film capacitor includes: an electrode terminal portion connected to the electrode, a first bus bar and a second bus bar covering the electrode; and a terminal forming portion extending from the rear end of the electrode terminal portion to the outside of the filling resin, and having a connection terminal connected to the external terminal at a portion exposed from the filling resin. The second bus bar is provided with a heat dissipation portion extending from the front end of the electrode terminal portion along the peripheral surface of the capacitor element.

Description

Technical Field

[0001] The present invention relates to capacitors. Background Art

[0002] Conventionally, there is known a case mold type capacitor in which bus bars are connected to electrodes provided on both end surfaces of a capacitor element, the capacitor element connected with the bus bars is housed in a case, and the case is filled with a filling resin (for example, see Patent Document 1).

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-103777 Summary of the invention

[0006] -Problems to be solved by the invention-

[0007] When power is supplied to the capacitor, the capacitor element generates heat. In the capacitor of the above structure, since the capacitor element is buried in the filling resin, it is difficult to release heat from the capacitor element. In particular, the two end faces of the capacitor element can be covered by the parts of the bus bar connected to the electrodes, so the heat generated from the two end faces can be easily released by moving the bus bar with good thermal conductivity, but the peripheral surface of the capacitor element is less covered by the bus bar, so it is difficult to dissipate heat.

[0008] In recent years, hybrid vehicles and electric vehicles have become popular. In these vehicles, the capacitor of the above structure can be mounted on an inverter device for driving an electric motor. In this case, a large current is likely to flow from the power supply device to the inverter device, and therefore, a large current is likely to flow to the capacitor element, and the heat generated by the capacitor element is likely to increase. Therefore, as mentioned above, if the heat dissipation from the capacitor element is insufficient, the capacitor element may suffer from adverse conditions such as thermal damage.

[0009] In view of the above problems, an object of the present invention is to provide a capacitor capable of improving heat dissipation from a capacitor element.

[0010] -Methods for solving problems-

[0011] The main aspect of the present invention relates to a capacitor. The capacitor involved in this aspect comprises a capacitor element; a first bus bar and a second bus bar, which are respectively connected to electrodes provided on both end surfaces of the capacitor element; a housing, which accommodates the capacitor element; and a filling resin, which is filled in the housing. Here, the first bus bar and the second bus bar respectively include: the electrode connecting portion, which covers the electrode and is connected to the electrode; and a first extended protrusion, which extends from one end of the electrode connecting portion to the outside of the filling resin, and has a connection terminal connected to an external terminal at the portion exposed from the filling resin. A second extended protrusion extending from an end different from the one end of the electrode connecting portion along the circumference of the capacitor element is provided on at least one of the first bus bar and the second bus bar.

[0012] -Effects of the Invention-

[0013] According to the present invention, it is possible to provide a capacitor capable of improving heat dissipation from a capacitor element.

[0014] The effects and significance of the present invention will be further clarified by the following description of the embodiments. However, the following embodiments are merely examples of implementing the present invention, and the present invention is not limited to the contents described in the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 (a) is a perspective view of a film capacitor according to an embodiment. Figure 1 (b) is a side cross-sectional view of the film capacitor in which the filling resin according to the embodiment is omitted.

[0016] Figure 2 (a) and (b) are perspective views of the capacitor element unit according to the embodiment, viewed from the upper front side and the lower rear side, respectively.

[0017] Figure 3 (a) and (b) are perspective views of a first bus bar and a second bus bar, respectively, according to the embodiment.

[0018] Figure 4 (a) is a perspective view of the housing according to the embodiment as viewed from the front and above. Figure 4 (b) is a perspective view of the housing according to the embodiment as seen from the front and below.

[0019] Figure 5 (a) and (b) are side cross-sectional views of a film capacitor according to a modification example in which the filling resin is omitted.

[0020] Figure 6It is a side cross-sectional view of a film capacitor according to a modification example in which the filling resin is omitted.

[0021] Figure 7 (a) is a side cross-sectional view of a film capacitor according to another embodiment. Figure 7 (b) and (c) are respectively a front view and a rear view of a capacitor element unit according to another embodiment.

[0022] Figure 8 (a) and (b) are side views of a capacitor element unit according to a modification of another embodiment. DETAILED DESCRIPTION

[0023] Hereinafter, a film capacitor 1 as an embodiment of the capacitor of the present invention will be described with reference to the accompanying drawings. For convenience, the front and back, left and right, and up and down directions are appropriately marked in each figure. In addition, the directions shown in the figure always indicate the relative directions of the film capacitor 1, and do not indicate the absolute directions. In addition, for the convenience of explanation, in the structure of a part such as the "bottom part" and the "front side part", a name corresponding to the direction shown in the figure is sometimes added.

[0024] In this embodiment, the film capacitor 1 corresponds to the "capacitor" described in the patent claims. In addition, the first electrode 110 and the second electrode 120 correspond to the "electrode" described in the patent claims. Furthermore, the electrode terminal portions 210 and 310 correspond to the "electrode connecting portion" described in the patent claims. Furthermore, the terminal forming portions 220 and 320 correspond to the "first extended protrusion" described in the patent claims. Furthermore, the heat dissipation portion 330 corresponds to the "second extended protrusion" described in the patent claims.

[0025] Among them, the above description is only for the purpose of establishing a correspondence between the structure of the patent claim scope and the structure of the implementation mode. Through the above correspondence, the invention recorded in the patent claim scope is not limited to the structure of the implementation mode.

[0026] Figure 1 (a) is a three-dimensional diagram of the film capacitor 1, Figure 1 (b) is a side cross-sectional view of the film capacitor 1 with the filling resin 500 omitted.

[0027] like Figure 1As shown in (a) and (b), the film capacitor 1 includes five capacitor elements 100, a first bus bar 200, a second bus bar 300, a housing 400, and a filling resin 500. The five capacitor elements 100, the first bus bar 200, and the second bus bar 300 are assembled as a whole to form a capacitor element unit 10. The capacitor element unit 10 is accommodated in the housing 400, and the housing 400 is filled with a filling resin 500. The filling resin 500 is a thermosetting resin, such as an epoxy resin. The portion of the capacitor element unit 10 buried in the filling resin 500 is protected by the housing 400 and the filling resin 500 from moisture and impact.

[0028] Figure 2 (a) and (b) are perspective views of the capacitor element unit 10 as viewed from the upper front and lower rear, respectively. Figure 3 (a) and (b) are perspective views of the first bus bar 200 and the second bus bar 300 , respectively.

[0029] The five capacitor elements 100 are formed by overlapping two metallized films on which aluminum is vapor-deposited on a dielectric film, winding or stacking the overlapping metallized films, and extruding them into a flat shape. The capacitor element 100 has a shape close to a flat long cylinder. In the capacitor element 100, a first electrode 110 is formed on one end face 101 by spraying a metal such as zinc, and a second electrode 120 is formed on the other end face 102 by spraying a metal such as zinc.

[0030] In addition, the capacitor element 100 of the present embodiment is formed of a metallized film formed by vapor-depositing aluminum on a dielectric film, and may also be formed of a metallized film vapor-deposited with other metals such as zinc and magnesium. Alternatively, the capacitor element 100 may be formed of a metallized film vapor-deposited with a plurality of metals among these metals, or may be formed of a metallized film vapor-deposited with alloys of these metals.

[0031] In the capacitor element unit 10, five capacitor elements 100 are arranged in a row in the left-right direction so that one end surface 101, i.e., the first electrode 110, faces upward, the other end surface 102, i.e., the second electrode 120, faces downward, and the peripheral surfaces 103 are adjacent to each other. The first electrodes 110 and the second electrodes 120 of the five capacitor elements 100 are electrically connected to the first bus bar 200 and the second bus bar 300, respectively.

[0032] The first bus bar 200 is formed by appropriately cutting and bending a conductive material, such as a copper plate, and has a structure in which an electrode terminal portion 210 and a terminal forming portion 220 are integrated. In the present embodiment, the first bus bar 200 is a N-pole bus bar.

[0033] The electrode terminal portion 210 is in a rectangular plate shape and contacts the first electrodes 110 of the five capacitor elements 100 so as to cover substantially the entire first electrodes 110 from above. That is, the front and rear ends of the electrode terminal portion 210 extend to the front and rear ends of the five capacitor elements 100. In addition, the left end of the electrode terminal portion 210 extends to the vicinity of the left end of the capacitor element 100 at the left end, and the right end of the electrode terminal portion 210 extends to the vicinity of the right end of the capacitor element 100 at the right end.

[0034] The electrode terminal portion 210 has five openings 211 arranged in the left-right direction corresponding to the first electrodes 110. A pair of connecting pins 212 is formed at the rear edge of each opening 211. The corresponding pair of connecting pins 212 is in contact with each first electrode 110 and is joined by a joining method such as welding. Since the thickness of each connecting pin 212 is smaller than the thickness of other parts of the electrode terminal portion 210, heat is not easily absorbed by the connecting pin 212, and welding is easy.

[0035] The terminal forming portion 220 has the same width as the electrode terminal portion 210, and is bent after extending from the rear end of the electrode terminal portion 210 in the upward direction to extend rearward at a slight upward inclination. Connecting terminals 221 are formed at three locations at the top end of the terminal forming portion 220. Each connecting terminal 221 has a shape in which the top end is bent upward after extending rearward while maintaining the same angle as the top end of the terminal forming portion 220. A circular mounting hole 221a is formed at the top end of each connecting terminal 221.

[0036] The portion of the terminal forming portion 220 excluding the three connection terminals 221 serves as a relay portion 222 that connects the electrode terminal portion 210 and the three connection terminals 221 .

[0037] In the first bus bar 200 , four U-shaped cutouts 231 arranged in the left-right direction are formed at the front end of the electrode terminal portion 210 .

[0038] The second bus bar 300 is formed by appropriately cutting and bending a conductive material such as a copper plate, and has an integrated structure of an electrode terminal portion 310, a terminal forming portion 320, and a heat dissipation portion 330. In the present embodiment, the second bus bar 300 is a P-pole bus bar.

[0039] The electrode terminal portion 310 is in a rectangular plate shape and contacts the second electrodes 120 of the five capacitor elements 100 so as to cover substantially the entire second electrodes 120 from below. That is, the front and rear ends of the electrode terminal portion 310 extend to the front and rear ends of the five capacitor elements 100. In addition, the left end of the electrode terminal portion 310 extends to the vicinity of the left end of the capacitor element 100 at the left end, and the right end of the electrode terminal portion 310 extends to the vicinity of the right end of the capacitor element 100 at the right end.

[0040] The electrode terminal portion 310 has five openings 311 arranged in the left-right direction corresponding to the second electrodes 120. A pair of connecting pins 312 is formed at the rear edge of each opening 311. The corresponding pair of connecting pins 312 is in contact with each second electrode 120 and is joined by a joining method such as welding. Since the thickness of each connecting pin 312 is smaller than the thickness of other parts of the electrode terminal portion 310, heat is not easily absorbed by the connecting pin 312, and welding is easy.

[0041] The terminal forming portion 320 has the same width as the electrode terminal portion 310, and extends upward from the rear end of the electrode terminal portion 310 along the peripheral surface 103 of the rear side of the five capacitor elements 100, bends forward on the peripheral surface 103, extends slightly upward, and then bends, and extends backward at an angle slightly upward. At the top end of the terminal forming portion 320, three connection terminals 321 are formed. Each connection terminal 321 has a shape in which the top end is bent upward after extending backward while maintaining the same angle as the top end of the terminal forming portion 320. A circular mounting hole 321a is formed at the top end of each connection terminal 321. Each connection terminal 321 is located adjacent to the right side of each connection terminal 221 of the first bus bar 200.

[0042] The portion of the terminal forming portion 320 excluding the three connection terminals 321 serves as a relay portion 322 that connects the electrode terminal portion 310 and the three connection terminals 321 .

[0043] The heat dissipation portion 330 has a rectangular plate shape having the same width as the electrode terminal portion 310, and extends upward from the front end of the electrode terminal portion 310 along the peripheral surface 103 of the front side of the five capacitor elements 100. The front end of the electrode terminal portion 310 is an end in a direction perpendicular to the direction in which the five capacitor elements 100 are arranged (an end side along the arrangement direction) and is different from the end (rear end) from which the terminal forming portion 320 extends.

[0044] The heat dissipation portion 330 covers more than half of the peripheral surface 103 of the five capacitor elements 100 from the end surface 102 side, that is, the second electrode 120 side, in the thickness direction of the capacitor element 100 (the direction in which the two end surfaces 101 and 102 are arranged), and more specifically, covers approximately two-thirds (see Figure 1(b)). Thus, when the peripheral surface 103 of the capacitor element 100 is equally divided into three regions, namely, the end surface 101 side, the central portion, and the end surface 102 side, in the thickness direction, the central portion is covered by the heat dissipation portion 330. Furthermore, the heat dissipation portion 330 covers the entire peripheral surface 103 of the three inner capacitor elements 100 in the direction in which the capacitor elements 100 are arranged, and covers more than half of the peripheral surface 103 of the capacitor elements 100 at the left and right ends, and more specifically, covers approximately two-thirds.

[0045] The heat dissipation portion 330 is close to the peripheral surface 103 of each capacitor element 100 with a slight gap therebetween (see Figure 1 (b) The heat dissipation portion 330 may be close to the peripheral surface 103 of each capacitor element 100 in a state of being in contact with the peripheral surface 103 .

[0046] A predetermined distance L (see FIG. 1 ) greater than a space distance (insulation distance) required for insulation is provided between the top end of the heat dissipation portion 330 and the first electrode 110 . Figure 1 (b)). Thus, the insulation between the second bus bar 300 and the first electrode 110 is ensured. In addition, it is preferable to make the distance L close to the spatial distance so that the portion of the peripheral surface 103 of the capacitor element 100 covered by the heat dissipation portion 330 increases.

[0047] In the second bus bar 300, four circular openings 341 are formed in the relay portion 322 of the terminal forming portion 320 and arranged in the left-right direction. In addition, in the second bus bar 300, four oblong openings 342 are formed in the left-right direction at the corners between the electrode terminal portion 310 and the terminal forming portion 320, and four square openings 343 are formed in the left-right direction at the corners between the electrode terminal portion 310 and the heat dissipation portion 330. Furthermore, in the second bus bar 300, square fitting pieces 344 are formed at the left and right ends of the relay portion 322.

[0048] In the capacitor element unit 10 , the upper portions of the relay portion 222 of the first bus bar 200 and the relay portion 322 of the second bus bar 300 overlap in their thickness directions. This is expected to reduce the ESL (equivalent series inductance) in the capacitor element unit 10 .

[0049] The first insulating sheet 610 is sandwiched between the overlapping portions of the relay portion 222 of the first bus bar 200 and the relay portion 322 of the second bus bar 300. In addition, the relay portion 222 of the first bus bar 200 is covered from above by three second insulating sheets 620. Furthermore, the relay portion 322 of the second bus bar 300 is covered from below by a third insulating sheet 630.

[0050] The first insulating sheet 610, the second insulating sheet 620, and the third insulating sheet 630 are formed of an electrically insulating resin material such as insulating paper, acrylic, and silicon. The first insulating sheet 610 ensures insulation between the first bus bar 200 and the second bus bar 300, insulation between the second bus bar 300 and the first electrode 110 of the capacitor element 100, and the like. In addition, when the film capacitor 1 is set in an external device such as an inverter device using the second insulating sheet 620 and the third insulating sheet 630, insulation between the first bus bar 200 and the second bus bar 300 and surrounding electrical components is ensured.

[0051] Figure 4 (a) is a perspective view of the housing 400 viewed from the front and above. Figure 4 (b) is a perspective view of the housing 400 as viewed from the front and below.

[0052] The housing 400 is made of resin, for example, polyphenylene sulfide (PPS) which is a thermoplastic resin, and is formed into a substantially rectangular box shape, having a bottom 401, a front side 402, a rear side 403, a left side 404, and a right side 405 rising from the bottom 401, and an opening on the top.

[0053] First mounting joints 410 are provided at the left side surface 404, the right side surface 405, and the left and right ends of the bottom surface 401. An insertion hole 411 is formed in each first mounting joint 410. In order to improve the strength of the hole, a metal collar 412 is embedded in the insertion hole 411. In addition, second mounting joints 420 are provided at the front end of the bottom surface 401, the center part, and the left and right ends. A metal nut 421 is embedded in the second mounting joint 420. These first mounting joints 410 and second mounting joints 420 are used when the film capacitor 1 is fixed to the installation part of the external device.

[0054] Inside the housing 400, a pair of ribs are formed at the lower rear end of the left side surface 404 and the right side surface 405 to form a fitting groove 430 extending in the vertical direction. The width of the fitting groove 430 is substantially equal to the thickness of the fitting piece 344 of the second bus bar 300. Figure 4 In (a), only the left-side fitting groove 430 is shown.

[0055] When equipping the film capacitor 1, if Figure 1As shown in (b), the capacitor element unit 10 is housed in the housing 400. At this time, the left and right fitting pieces 344 of the second bus bar 300 are embedded in the left and right fitting grooves 430 of the housing 400. As a result, the capacitor element unit 10 is not tilted relative to the housing 400 in the front, back, left, right, and up and down directions. One end face 101 of the five capacitor elements 100, that is, the first electrode 110 and the electrode terminal portion 210 of the first bus bar 200 are facing the opening 400a side of the housing 400, and the other end face 102, that is, the second electrode 120 and the electrode terminal portion 310 of the second bus bar 300 are opposite to the bottom surface 401 of the housing 400. The relay portion 322 of the terminal forming portion 320 of the second bus bar 300 is close to the inner wall surface of the rear side surface 403 of the housing 400 with a small gap. The heat dissipation portion 330 of the second bus bar 300 is disposed along the inner wall surface of the front side portion 402 of the housing 400 and is close to the inner wall surface with a small gap. The relay portion 322 and the heat dissipation portion 330 may also be configured to be in contact with the inner wall surface.

[0056] The filling resin 500 in a liquid phase is injected into the housing 400. At this time, the filling resin 500 passes through the cutout portion 231 of the first bus bar 200 and the openings 341, 342, and 343 of the second bus bar 300, so that the filling resin 500 easily spreads throughout the entire interior of the housing 400. When the filling resin 500 is filled in the housing 400 to the vicinity of the opening 400a of the housing 400 and the injection of the filling resin 500 is completed, the housing 400 is heated. As a result, the filling resin 500 in the housing 400 is cured.

[0057] In this way, Figure 1 As shown in (a), the film capacitor 1 is completed. In the capacitor element unit 10, the terminal forming portion 220 of the first bus bar 200 extends to the outside of the filling resin 500, and the three connection terminals 221 are exposed from the filling resin 500. Similarly, the terminal forming portion 320 of the second bus bar 300 extends to the outside of the filling resin 500, and the three connection terminals 321 are exposed from the filling resin 500.

[0058] The film capacitor 1 can be mounted on an inverter device for driving an electric motor in an electric vehicle, for example. Direct current is supplied to the inverter device from a power supply device (battery). The inverter device has an inverter circuit including an IGBT (Insulated Gate Bipolar transistor), which converts direct current power into three-phase alternating current power and supplies it to the electric motor. The external terminals (not shown) connected to the power supply device, which correspond to the connection terminals 221 at the right end of the first bus bar 200 and the connection terminals 321 at the right end of the second bus bar 300, are connected by screw fixation using mounting holes 221a and 321a. In addition, the external terminals (not shown) connected to the inverter circuit, which correspond to the three first connection terminal portions 220 of the first bus bar 200 and the three first connection terminal portions 320 of the second bus bar 300, are connected by screw fixation using mounting holes 221a and 321a. The connection terminal 221 at the right end of the first bus bar 200 and the connection terminal 321 at the right end of the second bus bar 300 connect external terminals of both the power supply device and the inverter device.

[0059] In order to improve the heat dissipation effect, in the film capacitor 1 provided in the inverter device, a cooler 2 is mounted on the rear side 403 of the housing 400 (see Figure 1 (b)). As the cooler 2, for example, a water-cooled cooler can be used.

[0060] When the inverter device operates and the film capacitor 1 is energized, the five capacitor elements 100 generate heat. Among the five capacitor elements 100, the inner three capacitor elements 100, especially the central capacitor element 100, are more likely to become high temperature due to heat generation than the left and right end capacitor elements 100.

[0061] The heat generated from the end surface 101 of each capacitor element 100 is transferred to the electrode terminal portion 210 of the first bus bar 200, and most of the heat moves from the electrode terminal portion 210 to the relay portion 222 of the terminal forming portion 220, and is released to the outside from the portion of the relay portion 222 exposed from the filling resin 500. A portion of the heat transferred to the electrode terminal portion 210 can also be released to the outside from the opening 400a of the housing 400 via the filling resin 500 above the electrode terminal portion 210.

[0062] The heat generated from the end surface 102, the front peripheral surface 103, and the rear peripheral surface 103 of each capacitor element 100 is transferred to the electrode terminal portion 310, the heat dissipation portion 330, and the relay portion 322 of the terminal forming portion 320 of the second bus bar 300, respectively. In the second bus bar 300, the relay portion 322 close to the rear side portion 403 of the housing 400 is cooled by the cooler 2, that is, the heat is absorbed. Therefore, the heat transferred to the relay portion 322 is released to the cooler 2, and most of the heat transferred to the electrode terminal portion 310 and the heat dissipation portion 330 moves to the relay portion 322 and is released to the cooler 2. A portion of the heat transferred to the electrode terminal portion 310 and the heat dissipation portion moves to the bottom portion 401 and the front side portion 402, respectively, and can also be released to the outside from the bottom portion 401 and the front side portion 402.

[0063] Thus, by dissipating heat from five capacitor elements 100 , these capacitor elements 100 are less likely to reach high temperatures.

[0064] In addition, when the first mounting joint 410 and the second mounting joint 420 are not provided on the bottom portion 401 of the housing 400, the cooler 2 may be mounted on the bottom portion 401. In this case, the electrode terminal portion 310 of the second bus bar 300 is cooled by the cooler 2, and the heat transferred to the heat dissipation portion 330 and the relay portion 322 moves to the electrode terminal portion 310.

[0065] In addition, the cooler 2 is sometimes not mounted on the film capacitor 1. In this case, most of the heat transferred to the electrode terminal portion 310, the heat dissipation portion 330, and the relay portion 322 of the second bus bar 300 is released to the outside from the portion of the relay portion 322 exposed from the filling resin 500, and the remaining heat is released to the outside from the bottom portion 401, the front side portion 402, and the rear side portion 403 of the housing 400.

[0066] <Effects of implementation>

[0067] As described above, according to this embodiment, the following effects are achieved.

[0068] The film capacitor 1 is constructed such that the first bus bar 200 and the second bus bar 300 include: electrode terminal portions 210, 310, covering the electrodes 110, 120 and connected to the electrodes 110, 120; and terminal forming portions 220, 320, extending from the rear ends of the electrode terminal portions 210, 310 to the outside of the filling resin 500, and having connection terminals 221, 321 connected to the external terminals in the portions exposed from the filling resin 500, and a heat dissipation portion 330 extending from the front ends of the electrode terminal portions 310 along the peripheral surface 103 of the capacitor element 100 is provided in the second bus bar 300.

[0069] According to this structure, by providing the heat dissipation portion 330 in the second bus bar 300, it is easy to dissipate heat not only from the two end surfaces 101 and 102 of the capacitor element 100, but also from the peripheral surface 103. Therefore, it is possible to suppress the capacitor element 100 from reaching a high temperature when the film capacitor 1 is energized, and to prevent thermal damage to the capacitor element 100.

[0070] Furthermore, film capacitor 1 is configured such that heat dissipation portion 330 is along the inner wall surface of case 400 .

[0071] According to this structure, the heat transferred to the heat dissipating portion 330 is easily transferred to the inner wall surface and easily released to the outside of the case 400 via the inner wall surface, so that the heat is further easily released from the capacitor element 100 .

[0072] Furthermore, film capacitor 1 is configured such that heat dissipation portion 330 extends from the end, ie, the front end, of electrode connection portion 310 in a direction perpendicular to the direction in which capacitor elements 100 are arranged.

[0073] According to this configuration, peripheral surface 103 of inner capacitor element 100 which is likely to reach a high temperature due to being sandwiched between left and right capacitor elements 100 can be covered by heat dissipation portion 330 , thereby improving the heat dissipation of inner capacitor element 100 and suppressing its high temperature.

[0074] Furthermore, the film capacitor 1 is configured such that a predetermined distance L is provided between the position of the tip of the heat dissipation portion 330 of the second bus bar 300 and the position connected to the first electrode 110 of the first bus bar 200 .

[0075] According to this structure, it is possible to ensure the insulation between the second bus bar 300 and the first electrode 110 and improve the heat dissipation of the capacitor element 100 .

[0076] Furthermore, the film capacitor 1 is constructed such that the capacitor element 100 is housed in the shell 400 so that the second electrode 120 connected to the second bus bar 300 is opposite to the bottom portion 401 of the shell 400, the terminal forming portion 320 of the second bus bar 300 is exposed from the filling resin 500 after extending along the peripheral surface 103 of the capacitor element 100, and the heat dissipation portion 330 is arranged on the second bus bar 300 among the first bus bar 200 and the second bus bar 300.

[0077] According to this structure, when the film capacitor 1 is installed in an external device, the cooler 2 can be mounted on the bottom portion 401 of the housing 400 or the side portion (rear side portion 403) facing the portion along the peripheral surface 103 of the terminal forming portion 320 to cool (absorb heat) the second bus bar 300, and the heat transferred to the heat dissipation portion 330 can be effectively released by providing the heat dissipation portion 330 on the side of the second bus bar 300 that can be cooled by the cooler 2. As a result, heat can be effectively dissipated from the peripheral surface 103 of the capacitor element 100, so that the capacitor element 100 becomes less likely to reach a high temperature.

[0078] <Change Example>

[0079] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, Moreover, application examples of this invention can also make various changes other than the said embodiment.

[0080] For example, in the above embodiment, the heat dissipation portion is not provided on the first bus bar 200, and the heat dissipation portion 330 is provided on the second bus bar 300. Figure 5 As shown in (a), the heat dissipation portion 330 may not be provided on the second bus bar 300, and a heat dissipation portion 230 similar to the heat dissipation portion 330 may be provided on the first bus bar 200. The heat dissipation portion 230 extends downward from the front end of the electrode terminal portion 210 of the first bus bar 200 along the peripheral surface 103 of the capacitor element 100, and a distance L for insulation is provided between the position of the top end thereof and the position of the second electrode 120.

[0081] Furthermore, if Figure 5 As shown in (b), heat dissipation portions 230 and 330 are provided on both sides of the first bus bar 200 and the second bus bar 300, respectively. In this structure, in the thickness direction of the capacitor element 100, the peripheral surface 103 of the capacitor element 100 is covered by more than half of the heat dissipation portions 230 and 330 on both sides. In addition, the top ends of the heat dissipation portions 230 and 330 on both sides are hung in the central area of ​​the peripheral surface 103, and a part of the central area is covered by the heat dissipation portions 230 and 330. Furthermore, a distance L for insulation is provided between the top ends of the heat dissipation portions 230 and 330 on both sides to ensure the insulation between the first bus bar 200 and the second bus bar 300. In addition, the lengths of the heat dissipation portions 230 and 330 on both sides in the thickness direction of the capacitor element 100 may be the same or different.

[0082] In addition, considering the heat dissipation effect when using the cooler 2, Figure 5 Compared with the structure of (a), as in the present embodiment, it is preferable to provide the heat dissipation portion 330 on the second bus bar 300. Figure 5In the case of the configuration (b), by attaching the cooler 2 to the front side portion 402 of the case 400 , both the first bus bar 200 and the second bus bar 300 can be cooled by the cooler 2 .

[0083] Furthermore, in the above-mentioned embodiment, a given distance L is provided between the top end of the heat dissipation portion 330 of the second bus bar 300 and the first electrode 110 of the capacitor element 100. Figure 6 As shown in FIG. 1 , the following structure may be adopted: the top of the heat dissipation portion 330 extends to the position of the first electrode 110, that is, in the thickness direction of the capacitor element 100, the peripheral surface 103 is entirely covered by the heat dissipation portion 330, and the fourth insulating sheet 640 is sandwiched between the top portion of the heat dissipation portion 330 and the capacitor element 100. In this structure, the insulation between the second bus bar 300 and the first electrode 110 is ensured by the fourth insulating sheet 640. In the case of adopting such a structure, the fourth insulating sheet 640 is newly required, but on the other hand, the area of ​​the peripheral surface 103 of the capacitor element 100 covered by the heat dissipation portion 330 becomes larger, and the heat dissipation performance from the peripheral surface 103 becomes better.

[0084] In addition, Figure 5 In the structure of (a), the following structure can also be adopted: Figure 6 Similarly to the structure of FIG. 1 , the top end of the heat dissipation portion 230 extends to the position of the second electrode 120 , and a fourth insulating sheet 640 is sandwiched between the top end portion of the heat dissipation portion 230 and the capacitor element 100 .

[0085] <Other embodiments>

[0086] Figure 7 (a) is a side cross-sectional view of a film capacitor 1A according to another embodiment. Figure 7 (b) and (c) are respectively a front view and a rear view of a capacitor element unit 20 according to another embodiment.

[0087] In this embodiment, the film capacitor 1A corresponds to the "capacitor" described in the patent claims. In addition, the first electrode 711 and the second electrode 712 correspond to the "electrode" described in the patent claims. Furthermore, the electrode terminal portions 721 and 731 correspond to the "electrode connecting portion" described in the patent claims. Furthermore, the terminal forming portions 722 and 732 correspond to the "first extended protrusion" described in the patent claims. Furthermore, the heat dissipation portion 723 corresponds to the "second extended protrusion" described in the patent claims.

[0088] The film capacitor 1A includes: a capacitor element unit 20 formed by connecting a first bus bar 720 and a second bus bar 730 to five capacitor elements 710; a rectangular parallelepiped housing 740 housing the capacitor element unit 20; and a filling resin 750 filled in the housing 740. The housing 740 is made of a resin such as PPS, and the filling resin 750 is made of a thermosetting resin such as epoxy resin. The capacitor element unit 20 is housed in the housing 740 so that the first electrodes 711 and the second electrodes 712 of the five capacitor elements 710 are opposed to the front side portion 741 and the rear side portion 742 of the housing 740, respectively.

[0089] The first bus bar 720 is formed by appropriately cutting and bending a conductive material, such as a copper plate, and has a structure in which an electrode terminal portion 721 , a terminal forming portion 722 , and a heat dissipation portion 723 are integrated.

[0090] The electrode terminal portion 721 is in a rectangular plate shape and contacts the first electrodes 711 of the five capacitor elements 710 so as to cover the entire first electrodes 711 from the front. Five openings 724 arranged in the left-right direction are formed in the electrode terminal portion 721 corresponding to the first electrodes 710. A pair of connecting pins 725 are formed at the upper edge of each opening 724. The corresponding pair of connecting pins 725 contacts each first electrode 711 and is joined by a joining method such as welding.

[0091] The terminal forming portion 722 extends backward from the upper end of the electrode terminal portion 721, bends, and extends upward. Three square connection terminals 726 are formed at the top end of the terminal forming portion 722. A circular mounting hole 726a is formed at the top end of each connection terminal 726.

[0092] The heat dissipation portion 723 has a rectangular plate shape having the same width as the electrode terminal portion 721, and extends rearward from the lower end of the electrode terminal portion 721 along the lower peripheral surface 710a of the five capacitor elements 710. The lower end of the electrode terminal portion 721 is an end in a direction orthogonal to the direction in which the five capacitor elements 710 are arranged, and is an end different from the end (upper end) from which the terminal forming portion 722 extends.

[0093] The heat dissipation portion 723 covers more than half of the peripheral surface 710a of the five capacitor elements 710 from the first electrode 711 side in the thickness direction of the capacitor element 100, and more specifically, covers approximately two-thirds. In addition, the heat dissipation portion 723 covers the entire peripheral surface 710a of the five capacitor elements 710 in the direction in which the capacitor elements 710 are arranged. Furthermore, the heat dissipation portion 723 contacts the peripheral surface 103 of each capacitor element 710.

[0094] A predetermined distance L greater than a space distance (insulation distance) required for insulation is provided between the tip of the heat dissipation portion 723 and the second electrode 712 . Insulation between the first bus bar 720 and the second electrode 712 is thereby ensured.

[0095] The heat dissipation portion 723 is disposed along the inner wall surface of the front side portion 741 of the housing 740 and is close to the inner wall surface with a small gap therebetween.

[0096] The second bus bar 730 is formed by appropriately cutting and bending a conductive material such as a copper plate, and has a structure in which an electrode terminal portion 731 and a terminal forming portion 732 are integrated.

[0097] The electrode terminal portion 731 is in a rectangular plate shape and contacts the second electrodes 712 of the five capacitor elements 710 so as to cover the entire second electrodes 712 from the rear. Five openings 733 arranged in the left-right direction are formed in the electrode terminal portion 731 corresponding to each second electrode 712. A pair of connecting pins 734 are formed at the upper edge of each opening 733. The corresponding pair of connecting pins 734 contacts each second electrode 712 and is joined by a joining method such as welding.

[0098] The terminal forming portion 732 extends upward from the upper end of the electrode terminal portion 731. Three square connection terminals 735 are formed at the top end of the terminal forming portion 732. A circular mounting hole 735a is formed at the top end of each connection terminal 735. Each connection terminal 735 is located adjacent to the left side of each connection terminal 726 of the first bus bar 720.

[0099] The insulating sheet 760 is sandwiched between the overlapping portions of the terminal forming portion 722 of the first bus bar 720 and the terminal forming portion 732 of the second bus bar 730. Thus, insulation and the like between the first bus bar 200 and the second bus bar 300 are ensured.

[0100] The film capacitor 1A is provided in an external device such as an inverter device. In this case, the cooler 2 is mounted on the front side surface portion 741 of the case 740 in the film capacitor 1A.

[0101] The film capacitor 1A of the present embodiment also has the same effects as those of the film capacitor 1 of the above-described embodiment.

[0102] In addition, in the film capacitor 1A of the present embodiment, as Figure 8 As shown in (a), the heat dissipation portion 723 may not be provided on the first bus bar 720, and a heat dissipation portion 736 which is the same as the heat dissipation portion 723 may be provided on the second bus bar 730. Figure 8 As shown in (b) of FIG. 1 , the heat dissipation portions 723 and 736 may be provided on both the first bus bar 720 and the second bus bar 730 , respectively.

[0103] Furthermore, in the film capacitor 1A of this embodiment, the following structure may be adopted: Figure 6 As in the structure of FIG. 7 , the top end of the heat dissipation portion 723 extends to the position of the second electrode 712 , and an insulating sheet is sandwiched between the top end portion of the heat dissipation portion 723 and the capacitor element 710 .

[0104] <Other changes>

[0105] In the above embodiment, the peripheral surfaces 103 of the five capacitor elements 100 are completely covered by the heat dissipation portion 330. However, compared with the three capacitor elements 100 on the inner side, the capacitor elements 100 on the left and right ends are less likely to become high temperature. Therefore, in the case where the heat dissipation of the capacitor elements 100 on the left and right ends is good, a structure in which only the peripheral surfaces 103 of the three capacitor elements 100 on the inner side are covered by the heat dissipation portion 330 can also be adopted. On the contrary, in the case where the heat dissipation of the capacitor elements 100 on the left and right ends is poor, in addition to the heat dissipation portion 330 extending from the front end of the electrode terminal portion 310, a heat dissipation portion extending from the left end of the electrode terminal portion 310 along the peripheral surface 103 of the left side of the capacitor element 100 on the left end and a heat dissipation portion extending from the right end of the electrode terminal portion 310 along the peripheral surface 103 of the right side of the capacitor element 100 on the right end can also be provided in the second bus bar 300. In addition, the above two changes can also be applied to the case where the heat dissipation portion 230 is provided on the first bus bar 200.

[0106] Furthermore, in the above-described embodiment, three connection terminal portions 221 and 321 are provided on the first bus bar 200 and the second bus bar 300 , but the number of the connection terminals 221 and 321 may be changed as appropriate.

[0107] Furthermore, in the above embodiment, the first bus bar 200 is an N-pole bus bar and the second bus bar 300 is a P-pole bus bar. However, the first bus bar 200 may be a P-pole bus bar and the second bus bar 300 may be an N-pole bus bar.

[0108] Furthermore, in the above-described embodiment, film capacitor 1 includes four capacitor elements 100. However, the number of capacitor element 100 may be one, and can be changed as appropriate.

[0109] Furthermore, in the above-mentioned embodiment, the capacitor element 100 is formed by overlapping two metallized films in which aluminum is vapor-deposited on a dielectric film and winding or stacking the overlapped metallized films. However, in addition to this, the capacitor elements 100 may be formed by overlapping a metallized film in which aluminum is vapor-deposited on both sides of a dielectric film and an insulating film and winding or stacking them.

[0110] Furthermore, in the above-described embodiment, the film capacitor 1 is cited as an example of the capacitor of the present invention. However, the present invention is also applicable to capacitors other than the film capacitor 1 .

[0111] In addition, the embodiments of the present invention can be variously modified as appropriate within the scope of the technical concept shown in the claims.

[0112] In the description of the above embodiments, terms indicating directions such as “above” and “below” indicate relative directions that depend only on the relative positional relationship of constituent members, and do not indicate absolute directions such as vertical directions and horizontal directions.

[0113] Industrial Applicability

[0114] The present invention is useful for capacitors used in various electronic devices, electrical equipment, industrial equipment, electrical equipment for vehicles, and the like.

[0115] -Explanation of symbols-

[0116] 1 Film capacitor (capacitor)

[0117] 100 Capacitor Elements

[0118] 110 first electrode (electrode)

[0119] 120 second electrode (electrode)

[0120] 200 First Bus

[0121] 210 Electrode terminal part (electrode connection part)

[0122] 220 Terminal forming portion (first extending protrusion)

[0123] 221 Connection terminal

[0124] 230 heat dissipation portion (second extended protrusion)

[0125] 300 Second bus bar

[0126] 310 Electrode terminal part (electrode connection part)

[0127] 320 Terminal forming portion (first extending protrusion)

[0128] 321 Connection terminal

[0129] 330 heat dissipation portion (second extended protrusion)

[0130] 400 Housing

[0131] 401 bottom part

[0132] 500 Filling Resin

[0133] 1A Film Capacitor (Capacitor)

[0134] 710 Capacitor Element

[0135] 711 First Electrode (Electrode)

[0136] 712 second electrode (electrode)

[0137] 720 First Bus

[0138] 721 Electrode terminal part (electrode connection part)

[0139] 722 Terminal forming portion (first extending protrusion)

[0140] 723 heat dissipation portion (second extended protrusion)

[0141] 726 Connection Terminals

[0142] 730 Second Bus

[0143] 731 Electrode terminal part (electrode connection part)

[0144] 732 Terminal forming portion (first extending protrusion)

[0145] 735 Connecting Terminals

[0146] 736 heat dissipation portion (second extended protrusion)

[0147] 740 Housing

[0148] 750 Filling Resin.

Claims

1. A capacitor having: A capacitor element including a first electrode and a second electrode facing each other; A first bus bar and a second bus bar are connected to the first electrode and the second electrode respectively; A housing having an opening, a bottom portion located on the opposite side of the opening, and a first side portion and a second side portion rising from the bottom portion toward the opening and facing each other, and accommodating the capacitor element; as well as Filling resin is filled in the shell, The capacitor element is housed in the housing so that the first electrode faces the opening and the second electrode faces the bottom surface. The first bus bar comprises: a first electrode connecting portion, covering at least a portion of the first electrode and connected to the first electrode; and The first bus bar first extension protrusion extends from one end of the first electrode connection portion to the outside of the filling resin, and has a first connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar comprises: a second electrode connecting portion covering at least a portion of the second electrode and connected to the second electrode; and The first extension protrusion of the second bus bar extends from one end of the second electrode connecting portion along the first peripheral surface of the capacitor element opposite to the first side surface, and then extends to the outside of the filling resin, and has a second connection terminal connected to an external terminal at a portion exposed from the filling resin. The first bus bar further includes a first bus bar second extending portion extending from an end of the first electrode connecting portion other than the one end toward the bottom portion along a second peripheral surface of the capacitor element facing the second side surface portion.

2. A capacitor having: A capacitor element including a first electrode and a second electrode facing each other; A first bus bar and a second bus bar are connected to the first electrode and the second electrode respectively; A housing having an opening, a bottom portion located on the opposite side of the opening, and a first side portion and a second side portion rising from the bottom portion toward the opening and facing each other, and accommodating the capacitor element; as well as Filling resin is filled in the shell, The capacitor element is housed in the housing so that the first electrode faces the opening and the second electrode faces the bottom surface. The first bus bar comprises: a first electrode connecting portion, covering at least a portion of the first electrode and connected to the first electrode; and The first bus bar first extension protrusion extends from one end of the first electrode connection portion to the outside of the filling resin, and has a first connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar comprises: a second electrode connecting portion covering at least a portion of the second electrode and connected to the second electrode; and The first extension protrusion of the second bus bar extends from one end of the second electrode connecting portion along the first peripheral surface of the capacitor element opposite to the first side surface, and then extends to the outside of the filling resin, and has a second connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar further includes: a second bus bar second extension protrusion extending from an end of the second electrode connecting portion different from the one end toward the opening along a second peripheral surface of the capacitor element facing the second side surface; The tip of the second extending portion of the second bus bar is arranged at a predetermined distance from the first electrode in a direction from the opening toward the bottom surface portion and closer to the bottom surface portion than the first electrode, and is buried in the filling resin.

3. A capacitor having: A capacitor element including a first electrode and a second electrode facing each other; A first bus bar and a second bus bar are connected to the first electrode and the second electrode respectively; A housing having an opening, a bottom portion located on the opposite side of the opening, and a first side portion and a second side portion rising from the bottom portion toward the opening and facing each other, and accommodating the capacitor element; as well as Filling resin is filled in the shell, The capacitor is configured such that a cooler is mounted on the first side surface or the second side surface of the housing. The capacitor element is housed in the housing so that the first electrode faces the opening and the second electrode faces the bottom surface. The first bus bar comprises: a first electrode connecting portion, covering at least a portion of the first electrode and connected to the first electrode; and The first bus bar first extension protrusion extends from one end of the first electrode connection portion to the outside of the filling resin, and has a first connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar comprises: a second electrode connecting portion covering at least a portion of the second electrode and connected to the second electrode; and The first extension protrusion of the second bus bar extends from one end of the second electrode connecting portion along the first peripheral surface of the capacitor element opposite to the first side surface, and then extends to the outside of the filling resin, and has a second connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar further includes a second bus bar second extending portion extending from an end of the second electrode connecting portion other than the one end toward the opening along a second peripheral surface of the capacitor element facing the second side surface.

4. The capacitor according to claim 1, wherein In the housing, three or more capacitor elements including the capacitor element are arranged in a row. The first bus bar second extending portion extends from an end of the first electrode connecting portion in a direction perpendicular to a direction in which the three or more capacitor elements are arranged.

5. The capacitor according to claim 2 or 3, wherein: In the housing, three or more capacitor elements including the capacitor element are arranged in a row. The second extending protrusion of the second bus bar extends from an end of the second electrode connecting portion in a direction perpendicular to a direction in which the three or more capacitor elements are arranged.

6. The capacitor according to any one of claims 1 to 3, wherein: A given distance is provided between a position of a tip end of the first bus bar located on an opposite side of the first extending protrusion of the first bus bar and a position of a tip end of the second bus bar located on an opposite side of the first extending protrusion of the second bus bar.

7. The capacitor according to claim 1, wherein The second bus bar further includes: a second bus bar second extension protrusion extending from an end of the second electrode connecting portion different from the one end along a second peripheral surface of the capacitor element facing the second side surface; A given distance is provided between a top end of the first bus bar second extending protrusion of the first bus bar and a top end of the second bus bar second extending protrusion of the second bus bar.

8. The capacitor according to claim 2 or 3, wherein: The first bus bar further includes: a first bus bar second extension protrusion extending from an end of the first electrode connecting portion different from the one end toward the bottom surface portion of the case along a second peripheral surface of the capacitor element facing the second side surface portion, A given distance is provided between a top end of the first bus bar second extending protrusion of the first bus bar and a top end of the second bus bar second extending protrusion of the second bus bar.

9. A capacitor comprising: A capacitor element including a first electrode and a second electrode facing each other; A first bus bar and a second bus bar are connected to the first electrode and the second electrode respectively; A housing having an opening, a bottom portion located on the opposite side of the opening, and a first side portion and a second side portion rising from the bottom portion toward the opening and facing each other, and accommodating the capacitor element; as well as Filling resin, filled in the shell, The capacitor element is housed in the housing so that the first electrode faces the first side surface and the second electrode faces the second side surface. The first bus bar comprises: a first electrode connecting portion, covering at least a portion of the first electrode and connected to the first electrode; and The first bus bar first extension protrusion extends from one end of the first electrode connection portion to the outside of the filling resin, and has a first connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar comprises: a second electrode connecting portion covering at least a portion of the second electrode and connected to the second electrode; and The first extension protrusion of the second bus bar extends from one end of the second electrode connecting portion along the first peripheral surface of the capacitor element opposite to the opening, and then extends to the outside of the filling resin, and has a second connection terminal connected to an external terminal at a portion exposed from the filling resin, The first bus bar further includes a first bus bar second extending portion extending from an end of the first electrode connecting portion other than the one end toward the second side surface portion along a second peripheral surface of the capacitor element facing the bottom surface portion.

10. A capacitor comprising: A capacitor element including a first electrode and a second electrode facing each other; A first bus bar and a second bus bar are connected to the first electrode and the second electrode respectively; A housing having an opening, a bottom portion located on the opposite side of the opening, and a first side portion and a second side portion rising from the bottom portion toward the opening and facing each other, and accommodating the capacitor element; as well as Filling resin is filled in the shell, The capacitor element is housed in the housing so that the first electrode faces the first side surface and the second electrode faces the second side surface. The first bus bar comprises: a first electrode connecting portion, covering at least a portion of the first electrode and connected to the first electrode; and The first bus bar first extension protrusion extends from one end of the first electrode connection portion to the outside of the filling resin, and has a first connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar comprises: a second electrode connecting portion covering at least a portion of the second electrode and connected to the second electrode; and The first extension protrusion of the second bus bar extends from one end of the second electrode connecting portion along the first peripheral surface of the capacitor element opposite to the opening, and then extends to the outside of the filling resin, and has a second connection terminal connected to an external terminal at a portion exposed from the filling resin, The second bus bar further includes a second bus bar second extension protrusion extending from an end of the second electrode connecting portion different from the one end toward the first side surface along a second peripheral surface of the capacitor element facing the bottom surface portion, The tip of the second extending portion of the second bus bar is arranged at a predetermined distance from the first electrode in a direction from the first side surface toward the second side surface and closer to the second side surface than the first electrode, and is buried in the filling resin.

11. A capacitor comprising: A capacitor element including a first electrode and a second electrode facing each other; A first bus bar and a second bus bar are connected to the first electrode and the second electrode respectively; A housing having an opening, a bottom portion located on the opposite side of the opening, and a first side portion and a second side portion rising from the bottom portion toward the opening and facing each other, and accommodating the capacitor element; as well as Filling resin is filled in the shell, The capacitor is configured such that a cooler is mounted on the first side surface or the second side surface of the housing. The capacitor element is housed in the housing so that the first electrode faces the first side surface and the second electrode faces the second side surface. The first bus bar comprises: a first electrode connecting portion, covering at least a portion of the first electrode and connected to the first electrode; and The first bus bar first extension protrusion extends from one end of the first electrode connection portion to the outside of the filling resin, and has a first connection terminal connected to an external terminal at a portion exposed from the filling resin. The second bus bar comprises: a second electrode connecting portion covering at least a portion of the second electrode and connected to the second electrode; and The first extension protrusion of the second bus bar extends from one end of the second electrode connecting portion along the first peripheral surface of the capacitor element opposite to the opening, and then extends to the outside of the filling resin, and has a second connection terminal connected to an external terminal at a portion exposed from the filling resin, The second bus bar further includes a second bus bar second extending portion extending from an end of the second electrode connecting portion other than the one end toward the first side surface portion along a second peripheral surface of the capacitor element facing the bottom surface portion.

12. The capacitor according to claim 9, wherein In the housing, three or more capacitor elements including the capacitor element are arranged in a row. The first bus bar second extending portion extends from an end of the first electrode connecting portion in a direction perpendicular to a direction in which the three or more capacitor elements are arranged.

13. The capacitor according to claim 10 or 11, wherein: In the housing, three or more capacitor elements including the capacitor element are arranged in a row. The second extending protrusion of the second bus bar extends from an end of the second electrode connecting portion in a direction perpendicular to a direction in which the three or more capacitor elements are arranged.

14. The capacitor according to any one of claims 9 to 11, wherein: A given distance is provided between a position of a tip end of the first bus bar located on an opposite side of the first extending protrusion of the first bus bar and a position of a tip end of the second bus bar located on an opposite side of the first extending protrusion of the second bus bar.

15. The capacitor according to claim 9, wherein The second bus bar further includes a second bus bar second extension protrusion extending from an end of the second electrode connecting portion different from the one end toward the first side surface along a second peripheral surface of the capacitor element facing the bottom surface portion, A given distance is provided between a top end of the first bus bar second extending protrusion of the first bus bar and a top end of the second bus bar second extending protrusion of the second bus bar.

16. The capacitor according to claim 10 or 11, wherein: The first bus bar further includes: a first bus bar second extension protrusion extending from an end of the first electrode connecting portion different from the one end toward the second side surface portion along a second peripheral surface of the capacitor element facing the bottom surface portion, A given distance is provided between a top end of the first bus bar second extending protrusion of the first bus bar and a top end of the second bus bar second extending protrusion of the second bus bar.

Images