Capacitors

Abstract

The film capacitor is composed of three capacitor elements, a first bus bar, a second bus bar, and an insulating plate, which are assembled as a whole to form a capacitor element assembly, and the capacitor element assembly is accommodated in a housing. A mounting joint is provided on the insulating plate, and a mounting boss for mounting the mounting joint is provided on the housing, so that the capacitor element assembly is arranged at a given position relative to the housing, and the first bus bar and the second bus bar do not contact the housing.

Description

Technical Field

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

[0002] In the past, a capacitor having a capacitor element assembly and accommodating the capacitor element assembly in a resin case is known, wherein the capacitor element assembly has a structure in which bus bars are connected to electrodes formed on both end surfaces of the capacitor element and a part of the bus bars are stacked with an insulating plate interposed therebetween. A film capacitor as an example of such a capacitor is described in Patent Document 1, for example.

[0003] In the film capacitor of Patent Document 1, the lower bus bar connected to the capacitor element is opposite to the bottom surface of the case, and the capacitor assembly is supported by a plurality of support ribs formed on the bottom surface of the case so that a small gap can be formed between the lower bus bar and the bottom surface of the case. At this time, the lower bus bar contacts the support ribs which are part of the case.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2017 / 081853 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In recent years, as electric vehicles have become more popular, capacitors have begun to be used in electric vehicles. For example, a capacitor can be connected to a power supply device that drives an electric motor or the like. In this case, a large current easily flows from the power supply device to the capacitor, and the capacitor element and bus bar easily heat up. As a result, the temperature of the capacitor easily increases.

[0009] Therefore, in order to realize a capacitor with high heat dissipation performance, it is considered to use a metal case instead of a resin case.

[0010] However, when the case is made of metal, if a structure is adopted in which the bus bar contacts the case when the capacitor element assembly is arranged at a given position in the case as in the film capacitor of Patent Document 1, the current flowing through the bus bar will flow into the case.

[0011] In view of the related problems, an object of the present invention is to provide a capacitor capable of arranging a capacitor element assembly at a predetermined position relative to a metal case while ensuring insulation between a bus bar and the case.

[0012] Means for solving problems

[0013] The capacitor involved in the main mode of the present invention comprises a capacitor element assembly and a metal shell that accommodates the capacitor element assembly. The capacitor element assembly comprises: a capacitor element; a first electrode formed on one of the two end surfaces of the capacitor element; a second electrode formed on the other of the two end surfaces of the capacitor element; a first bus bar connected to the first electrode and having a first region; a second bus bar connected to the second electrode and having a second region opposite to the first region; and a first insulating member having insulating properties and interposed between the first region and the second region. A first mounting portion is provided on the first insulating member, and a second mounting portion on which the first mounting portion is mounted is provided on the shell, so that the capacitor element assembly is arranged at a given position relative to the shell, and the first bus bar and the second bus bar do not contact the shell.

[0014] Effects of the Invention

[0015] According to the present invention, the capacitor element assembly can be arranged at a predetermined position relative to the case while ensuring the insulation between the bus bar and the metal case.

[0016] The effects and significance of the present invention will become more apparent through the description of the following embodiments. However, the following embodiments are merely examples of the present invention, and the present invention is not limited to the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 (a) is a perspective view of a film capacitor according to an embodiment of the present invention. Figure 1 (b) is a perspective view of the film capacitor before the case is filled with a filling resin according to the embodiment.

[0018] Figure 2 (a) is a perspective view of a capacitor element assembly according to an embodiment as viewed from the front and above, Figure 2 (b) is a perspective view of the capacitor element assembly according to the embodiment as viewed from the rear and below.

[0019] Figure 3 (a) is a perspective view of a first bus bar according to an embodiment, Figure 3 (b) is a perspective view of the second bus bar according to the embodiment.

[0020] Figure 4 (a) is a perspective view of the insulating plate according to the embodiment as viewed from the front and above, Figure 4 (b) is a perspective view of the insulating plate according to the embodiment as viewed from the rear and below.

[0021] Figure 5(a) is a perspective view of a housing according to an embodiment of the present invention. Figure 5 (b) is a top view of the shell involved in the embodiment.

[0022] Figure 6 (a) is a front cross-sectional view of the film capacitor according to the embodiment in a state where the film capacitor is cut at the joint position between the mounting tab and the mounting boss. Figure 6 (b) is a side cross-sectional view of the film capacitor according to the embodiment in a state where the film capacitor is cut at the center.

[0023] Figure 7 (a) is a perspective view of the capacitor element assembly according to Modification Example 1 with one insulating cover removed. Figure 7 (b) is a side cross-sectional view of the film capacitor according to Modification Example 1 in a state where the film capacitor is cut at the center.

[0024] Figure 8 (a) and Figure 8 (b) is a diagram for explaining a thin film capacitor according to another modification example. DETAILED DESCRIPTION

[0025] The following is an explanation of a film capacitor 1 as an embodiment of the capacitor of the present invention with reference to the accompanying drawings. For convenience, it is appropriate to annotate the front and back, left and right, and up and down directions in each figure. In addition, the directions shown in the figure ultimately represent the relative directions of the film capacitor 1, not the absolute directions. In addition, for the convenience of explanation, sometimes a name that follows the directions shown in the figure is marked in a part of the structure such as the "bottom part" and the "front side part".

[0026] In the present embodiment, the thin film capacitor 1 corresponds to the "capacitor" recorded in the claims. In addition, the first end surface electrode 110 corresponds to the "first electrode" recorded in the claims, and the second end surface electrode 120 corresponds to the "second electrode" recorded in the claims. Furthermore, the first main body 210 corresponds to the "first region" recorded in the claims, and the second main body 310 corresponds to the "second region" recorded in the claims. Furthermore, the second electrode terminal portion 320 corresponds to the "electrode connecting portion" recorded in the claims. Furthermore, the insulating plate 400 corresponds to the "first insulating member" recorded in the claims. Furthermore, the mounting joint 430 corresponds to the "first mounting portion" recorded in the claims. Furthermore, the mounting boss 520 corresponds to the "second mounting portion" recorded in the claims. Furthermore, the screw 700 corresponds to the "screw" recorded in the claims.

[0027] The above description is ultimately intended to establish correspondence between the structure of the claims and the structure of the embodiment, and the invention described in the claims is not limited by the structure of the embodiment due to the above correspondence.

[0028] Figure 1 (a) is a three-dimensional diagram of the film capacitor 1, Figure 1 (b) is a perspective view of the film capacitor 1 before the case 500 is filled with the filling resin 600 .

[0029] like Figure 1 (a) and Figure 1 As shown in (b), the film capacitor 1 includes three capacitor elements 100, a first bus bar 200, a second bus bar 300, an insulating plate 400, a housing 500, and a filling resin 600. The three capacitor elements 100, the first bus bar 200, the second bus bar 300, and the insulating plate 400 are assembled into one body to form a capacitor element assembly 10. The capacitor element assembly 10 is accommodated in the housing 500, and the housing 500 is filled with the filling resin 600. The filling resin 600 is a thermosetting resin, such as an epoxy resin. The portion of the capacitor element assembly 10 buried in the filling resin 600 is protected from moisture and collision by the housing 500 and the filling resin 600.

[0030] Figure 2 (a) is a perspective view of the capacitor element assembly 10 viewed from the front and above. Figure 2 (b) is a perspective view of the capacitor element assembly 10 as viewed from the rear and below.

[0031] Two metallized films on which aluminum is vapor-deposited on a dielectric film are overlapped, and the overlapped metallized films are wound or stacked and pressed into a flat shape, thereby forming a capacitor element 100. The capacitor element 100 includes two end faces 101 and a peripheral surface 102 connecting these end faces 101. The peripheral surface 102 includes two flat surfaces 102a and two arc surfaces 102b connecting these flat surfaces 102a, and the central part of each arc surface 102b becomes a flat surface. The capacitor element 100 as a whole adopts a form close to a flat long cylinder.

[0032] In the capacitor element 100, a first end surface electrode 110 is formed by spraying a metal such as zinc on one end surface 101, and a second end surface electrode 120 is formed by spraying the same metal such as zinc on the other end surface 101. The three capacitor elements 100 are arranged in the left-right direction so that the first end surface electrode 110 and the second end surface electrode 120 face upward and downward, respectively, and the flat surfaces 102a of the peripheral surface 102 are adjacent to each other. In this state, the first bus bar 200 and the second bus bar 300 are connected to the three capacitor elements 100.

[0033] In addition, the capacitor element 100 of the present embodiment is formed by a metalized film on which aluminum is vapor-deposited on a dielectric film, but in addition, it can also be formed by a metalized film on which other metals such as zinc and magnesium are vapor-deposited. Alternatively, the capacitor element 100 can also be formed by a metalized film on which multiple metals among these metals are vapor-deposited, and can also be formed by a metalized film on which alloys of these metals are vapor-deposited.

[0034] Figure 3 (a) is a perspective view of the first bus bar 200. Figure 3 (b) is a perspective view of the second bus bar 300 .

[0035] 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 a first main body portion 210 , three first electrode terminal portions 220 , and three first connection terminal portions 230 are integrated.

[0036] The first main body 210 includes: an upper surface portion 211 in the shape of a square plate elongated in the left-right direction; and three front surface portions 212 in the shape of a square plate provided at the center, left end, and right end of the front edge of the upper surface portion 211 and hanging down from the front edge. A predetermined interval is provided between the central front surface portion 212 and the left and right front surface portions 212. The upper surface portion 211 is cut so that the front edge portion between the two front surface portions 212 is recessed toward the rear. In the upper surface portion 211, a circular through hole 213 is formed at the left end, and an oblong through hole 214 elongated in the left and right directions is formed at the right end.

[0037] The three first electrode terminal portions 220 have a square plate shape and extend forward from the front edges of the three front surface portions 212 of the first body portion 210. Two connection pins 221 are formed on the front edges of the first electrode terminal portions 220 and arranged in the left-right direction.

[0038] The three first connection terminals 230 are in a square plate shape and extend rearward from the rear edge of the upper surface 211 of the first body 210. The three first connection terminals 230 are arranged in the left-right direction at a predetermined interval from the center of the upper surface 211 and slightly offset to the left.

[0039] The second bus bar 300 is formed by appropriately cutting and bending a conductive material such as a copper plate, and has a structure in which a second main body portion 310 , three second electrode terminal portions 320 , and three second connection terminal portions 330 are integrated.

[0040] The second main body portion 310 includes: an upper surface portion 311 in the shape of a square plate elongated in the left-right direction; and three front surface portions 312 in the shape of a square plate provided at the central portion, the left end portion and the right end portion of the front edge of the upper surface portion 311 and hanging down from the front edge. A given interval is provided between the central front surface portion 312 and the left and right front surface portions 312. The upper surface portion 311 is cut so that the front edge portion between the two front surface portions 312 is recessed toward the rear. In the upper surface portion 311, an oblong through hole 313 elongated in the left and right directions is formed at the left end portion, and a circular through hole 314 is formed at the right end portion. The three front surface portions 312 of the second main body portion 310 are longer in the up-down direction than the three front surface portions 212 of the first main body portion 210.

[0041] The three second electrode terminal portions 320 have a square plate shape and extend forward from the front edge of the three front surface portions 312 of the second main body portion 310. In the second electrode terminal portion 320, two connecting pins 321 are formed at the front edge and arranged in the left-right direction. The three second electrode terminal portions 320 are longer in the front-to-back direction than the three first electrode terminal portions 220.

[0042] The three second connection terminals 330 are in a square plate shape and extend rearward from the rear edge of the upper surface 311 of the second body 310. The three second connection terminals 330 are arranged in the left-right direction at a predetermined interval from the center of the upper surface 311 and slightly offset to the right.

[0043] Figure 4 (a) is a perspective view of the insulating plate 400 viewed from the front and above. Figure 4 (b) is a perspective view of the insulating plate 400 as viewed from the rear and below.

[0044] The insulating plate 400 is formed of a resin such as polyphenylene sulfide (PPS) and has insulating properties. The insulating plate 400 includes a first insulating portion 410 and a second insulating portion 420 .

[0045] The first insulating portion 410 has a rectangular plate shape that is long in the left-right direction. On the surface (upper surface) of the first insulating portion 410, cylindrical protrusions 411 and 412 are formed at the left end and the right end, respectively. In addition, on the back surface (lower surface) of the first insulating portion 410, cylindrical protrusions 413 and 414 are formed at the left end and the right end, respectively. The outer diameter of the protrusion 411 is substantially equal to the inner diameter of the through hole 213 of the first bus bar 200, and the outer diameter of the protrusion 412 is substantially equal to the inner diameter of the short side of the through hole 214 of the first bus bar 200. The outer diameter of the protrusion 413 is substantially equal to the inner diameter of the short side of the through hole 313 of the second bus bar 300, and the outer diameter of the protrusion 414 is substantially equal to the inner diameter of the through hole 314 of the second bus bar 300.

[0046] The second insulating portion 420 has a rectangular plate shape that is long in the horizontal direction, and extends downward from the front edge of the first insulating portion 410. Two mounting tabs 430 having a pentagonal plate shape are provided on the second insulating portion 420 so as to be aligned in the horizontal direction.

[0047] The two mounting joints 430 are provided parallel to the upper surface of the first insulating portion 410 and are located in the center of the second insulating portion 420 in the vertical direction. The interval between the two mounting joints 430 is equal to the interval between two mounting bosses (described later) on the side of the housing 500. A circular through hole 431 is formed in the mounting joint 430. The back surface (lower surface) of the mounting joint 430 serves as a mounting surface 432 mounted on the mounting boss.

[0048] The lower side of each mounting tab 430 of the second insulating portion 420 is open. In addition, the upper side of each mounting tab 430 of the second insulating portion 420 is recessed rearward, and a rectangular opening 421 is formed in the recessed portion.

[0049] On the surface of the insulating plate 400, ribs 440 extending along the left edge, right edge, and rear edge of the first insulating portion 410 and the left edge and right edge of the second insulating portion 420 are formed. The ribs 440 are interrupted at a portion corresponding to the first connection terminal portion 230 of the first bus bar 200. In addition, on the back surface of the insulating plate 400, ribs 450 extending along the left edge and right edge of the first insulating portion 410 are formed.

[0050] Positioning tabs 460 and 470 are provided at the lower ends of the front sides of the ribs 450 at the left and right edges of the back surface of the insulating plate 400 so as to extend to the left and right, respectively. The left and right positioning tabs 460 and 470 are provided parallel to the upper surface of the first insulating portion 410. An oblong through hole 461 that is long in the left-right direction is formed in the positioning tab 460, and a circular through hole 471 is formed in the positioning tab 470.

[0051] When assembling the capacitor element assembly 10, the first bus bar 200 is overlapped on the surface of the insulating plate 400 from above, and the second bus bar 300 is overlapped on the back surface of the insulating plate 400 from below. At this time, the protrusions 411 and 412 of the insulating plate 400 are inserted into the through holes 213 and 214 of the first bus bar 200. In addition, the protrusions 413 and 414 of the insulating plate 400 are inserted into the through holes 313 and 314 of the second bus bar 300. As a result, the first bus bar 200 and the second bus bar 300 are positioned and fixed in the front-back and left-right directions relative to the insulating plate 400.

[0052] The three capacitor elements 100 are mounted between the three first electrode terminal portions 220 of the first bus bar 200 and the three second electrode terminal portions 320 of the second bus bar 300. Each of the first electrode terminal portions 220 is in contact with the first end surface electrode 110 of each capacitor element 100, and each of the second electrode terminal portions 320 is in contact with the second end surface electrode 120 of each capacitor element 100. Each of the connection pins 221 of the first electrode terminal portion 220 is joined to the first end surface electrode 110 by a joining method such as brazing. Thus, the first bus bar 200 is electrically connected to the first end surface electrode 110 of the three capacitor elements 100. Similarly, each of the connection pins 321 of the second electrode terminal portion 320 is joined to the second end surface electrode 120 by a joining method such as brazing. Thus, the second bus bar 300 is electrically connected to the second end surface electrode 120 of the three capacitor elements 100.

[0053] The first bus bar 200 and the second bus bar 300 are connected to the three capacitor elements 100 and are fixed in the vertical direction, and do not fall off the insulating plate 400 in the vertical direction. In this way, the three capacitor elements 100, the first bus bar 200, the second bus bar 300 and the insulating plate 400 are integrated, as shown in FIG. Figure 2 (a) and Figure 2 The capacitor element assembly 10 is completed as in (b).

[0054] The first main body 210 of the first bus bar 200 and the second main body 310 of the second bus bar 300 (excluding the lower portion of the front surface 312) overlap each other, that is, face each other, with the insulating plate 400 interposed therebetween. This can effectively reduce the ESL (equivalent series inductance) of the first bus bar 200 and the second bus bar 300.

[0055] Figure 5 (a) is a three-dimensional view of the housing 500. Figure 5 (b) is a top view of the housing 500. Figure 5 In (b) of FIG. 5 , three capacitor elements 100 arranged in case 500 are indicated by dotted lines for the purpose of explaining case 500 .

[0056] The housing 500 is made of metal, for example, by aluminum die casting. The housing 500 is formed into a rectangular box shape, having: a bottom portion 501; and a front side portion 502, a rear side portion 503, a left side portion 504, and a right side portion 505 erected from the bottom portion 501, and an upper surface is open. In the housing 500, the left-right direction in which the three capacitor elements 100 accommodated are arranged is the long side direction, and the front-back direction is the short side direction.

[0057] In the housing 500, cylindrical protrusions 511 and 512 are formed at the upper ends of the corners between the left side surface 504 and the rear side surface 503, and at the upper ends of the corners between the right side surface 505 and the rear side surface 503. The outer diameter of the protrusion 511 is substantially equal to the inner diameter of the short side of the through hole 461 of the positioning joint 460 of the insulating plate 400, and the outer diameter of the protrusion 512 is substantially equal to the inner diameter of the through hole 471 of the positioning joint 470 of the insulating plate 400.

[0058] In the housing 500, two cylindrical mounting bosses 520 are arranged in the left-right direction on the inner surface of the bottom surface 501, that is, the rear part of the inner bottom surface. The mounting boss 520 on the left side is located in a triangular prism-shaped space surrounded by the arc surface 102b of the capacitor element 100 at the left end, the arc surface 102b of the capacitor element 100 at the center, and the rear side surface 503, and the mounting boss 520 on the right side is located in a triangular prism-shaped space surrounded by the arc surface 102b of the capacitor element 100 at the right end, the arc surface 102b of the capacitor element 100 at the center, and the rear side surface 503. In this way, since two mounting bosses 520 are arranged by utilizing the open space formed when three capacitor elements 100 are configured in the housing 500, it is difficult to increase the size of the housing 500. In addition, the corresponding amount of filling resin 600 originally filled in the empty space can be reduced, which is related to the saving of filling resin 600.

[0059] A threaded hole 521 having an internal thread is provided on the upper end surface of the mounting boss 520. The upper end surface of the mounting boss 520 becomes a mounting surface 522 for mounting the mounting joint 430 of the insulating plate 400. The mounting surface 522 is parallel to the inner bottom surface of the housing 500. The mounting boss 520 is connected to the front side portion 502 through the rib 531, and is connected to the rear side portion 503 through the rib 532. The two ribs 531 and 532 have substantially the same height as the mounting boss 520. The front rib 531 passes through the gap between two adjacent capacitor elements 100. The mounting boss 520 is reinforced by the two ribs 531 and 532.

[0060] Figure 6 (a) is a front cross-sectional view of the film capacitor 1 in a state where the connection position between the mounting joint 430 and the mounting boss 520 is cut off, Figure 6 (b) is a side cross-sectional view of the film capacitor 1 in a state where the film capacitor 1 is cut at the center. Figure 6 (a) and Figure 6 (b) shows the film capacitor 1 in a state before the case 500 is filled with the filling resin 600 .

[0061] like Figure 1 (b) Figure 6 (a) and Figure 6As shown in (b), the capacitor element assembly 10 is accommodated in the housing 500 from above. At this time, the protrusions 511 and 512 of the housing 500 are embedded in the through holes 461 and 471 of the positioning joints 460 and 470 of the insulating plate 400. As a result, the capacitor element assembly 10 is positioned and fixed relative to the housing 500 in the front, back, left and right directions and is arranged at a given position relative to the housing 500. In addition, the two mounting joints 430 of the insulating plate 400 are placed on the two mounting bosses 520 of the housing 500. The mounting surface 432 of the mounting joint 430 contacts the mounting surface 522 of the mounting boss 520, and the through hole 431 of the mounting joint 430 matches the threaded hole 521 of the mounting boss 520. In addition, the protrusions 511 and 512 are very strong because they are formed in the corners of the housing 500 with high rigidity. Therefore, the capacitor element assembly 10 can be reliably positioned using the protrusions 511 and 512.

[0062] The two screws 700 pass through the through holes 431 of the two mounting joints 430 and are fastened to the threaded holes 521 of the two mounting bosses 520. In this way, the two mounting joints 430 are mounted on the two mounting bosses 520 and fixed with the two screws 700. Thus, the capacitor element assembly 10 is fixed to the housing 500 through the portion of the insulating plate 400.

[0063] like Figure 6 As shown in (a), the distance L1 (the height of the mounting boss 520) between the mounting surface 522 of the mounting boss 520 and the inner bottom surface of the housing 500 (the inner surface of the bottom portion 501) is made larger than the distance L2 between the mounting surface 432 of the mounting joint 430 and the outer surface 320a (the surface facing the inner bottom surface of the housing 500) of the second electrode terminal portion 320 of the second bus bar 300. As a result, the second electrode terminal portion 320 of the second bus bar 300 is separated from the inner bottom surface of the housing 500 and is not in contact with the inner bottom surface. In addition, as Figure 6 As shown in (b) of FIG. 5 , the second end surface electrode 120 of the capacitor element 100 located above the second electrode terminal portion 320 is also not in contact with the inner bottom surface of the case 500 .

[0064] Furthermore, if Figure 6 As shown in (b), the distance L3 from the center of the threaded hole 521 of the mounting boss 520 to the inner surface of the rear side surface 503 of the housing 500 is greater than the distance L4 from the center of the through hole 431 of the mounting joint 430 to the outer surface 312a of the front surface portion 312 of the second main body portion 310 of the second bus bar 300. As a result, the front surface portion 312 of the second main body portion 310 of the second bus bar 300 is separated from the inner surface of the rear side surface 503 of the housing 500 and is in a state of not contacting the inner surface.

[0065] When the capacitor element assembly 10 is accommodated in the housing 500, a filling resin 600 in a liquid phase state is injected into the housing 500. At this time, the filling resin 600 on the central side of the housing 500 flows through the two openings 421 of the insulating plate 400, so that it is easy to spread between the second bus bar 300 and the rear side portion 503 of the housing 500. The filling resin 600 is filled in the housing 500 to a position higher than the two mounting joints 430 of the insulating plate 400, and the space between the capacitor element assembly 10 and the housing 500 is filled with the filling resin 600. When the injection of the filling resin 600 is completed, the housing 500 is heated to harden the filling resin 600 in the housing 500. The capacitor element assembly 10 is also fixed relative to the housing 500 by the hardened filling resin 600.

[0066] In this way, Figure 1 The film capacitor 1 is completed as shown in (a).

[0067] The film capacitor 1 is mounted on an electric vehicle, for example, and can be connected to a DC power supply device that drives an electric motor or the like. In this case, three external terminals from one pole side of the power supply device are connected to three first connection terminal portions 230 of the first bus bar 200 by soldering or welding, and three external terminals from the other pole side are connected to three second connection terminal portions 330 of the second bus bar 300 by soldering or welding. In addition, when the connection of the external terminals to the first bus bar 200 and the second bus bar 300 is performed by screws, through holes for passing the screws are formed in the first connection terminal portion 230 and the second connection terminal portion 330.

[0068] A large DC current can be input from a power supply device to the film capacitor 1. In this case, since a large current flows, the capacitor element 100, the first bus bar 200, and the second bus bar 300 are likely to generate heat. In this embodiment, since the housing 500 is made of metal, the generated heat is easily dissipated from the housing 500.

[0069] <Effects of Implementation Methods>

[0070] As described above, according to this embodiment, the following effects are achieved.

[0071] The capacitor element 100, the first bus bar 200, the second bus bar 300 and the insulating plate 400 are integrally assembled to form a capacitor element assembly 10, and the capacitor element assembly 10 is accommodated in a metal case 500. Then, a mounting joint 430 is provided on the insulating plate 400, and a mounting boss 520 for mounting the mounting joint 430 is provided on the case 500, so that the capacitor element assembly 10 is arranged at a given position relative to the case 500 and the first bus bar 200 and the second bus bar 300 do not contact the case 500.

[0072] According to this structure, since the housing 500 is made of metal, the heat dissipation from the housing 500 becomes good, and the film capacitor 1 is unlikely to reach a high temperature. In addition, since the insulating plate 400 having insulating properties is in contact with the housing 500 when the capacitor element assembly 10 is arranged at a given position relative to the housing 500, the first bus bar 200 and the second bus bar 300 are not in contact with the housing 500, the insulation between the first bus bar 200 and the second bus bar 300 and the metal housing 500 can be ensured.

[0073] In addition, the capacitor element 100 is arranged in the housing 500 in such a direction that the second end surface electrode 120 faces the inner bottom surface of the housing 500, and the second bus bar 300 includes a second electrode terminal portion 320 located between the second end surface electrode 120 and the inner bottom surface of the housing 500 and connected to the second end surface electrode 120. In this case, the mounting joint 430 is mounted on the mounting boss 520 so that the second electrode terminal portion 320 does not contact the inner bottom surface of the housing 500.

[0074] Specifically, the mounting boss 520 includes a mounting surface 522 parallel to the inner bottom surface of the housing 500, and the mounting joint 430 includes a mounting surface 432 in contact with the mounting surface 522 of the mounting boss 520. Furthermore, a distance L1 between the mounting surface 522 of the mounting boss 520 and the inner bottom surface of the housing 500 is made larger than a distance L2 between the mounting surface 432 of the mounting joint 430 and the outer surface 320a of the second electrode terminal portion 320.

[0075] According to this structure, even if the support portion supporting the capacitor element assembly 10 is not made to protrude from the inner bottom surface of the case 500, a gap can be provided between the inner bottom surface of the case 500 and the second electrode terminal portion 320 of the second bus bar 300. Thus, it is possible to prevent the current flowing through the second bus bar 300 from leaking to the case 500 through the support portion, etc., and to ensure insulation between the second bus bar 300 and the metal case 500.

[0076] Furthermore, since the mounting joint 430 is mounted on the mounting boss 520 by the screw 700 , the insulating plate 400 , namely, the capacitor element assembly 10 can be reliably fixed to the case 500 .

[0077] In addition, in the present embodiment, since the contact between the second end surface electrode 120 of the capacitor element 100 and the inner bottom surface of the case 500 can be avoided, the insulation between the capacitor element 100 and the metal case 500 can be ensured.

[0078] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible in addition to the above embodiment as application examples of the present invention.

[0079] <Change Example 1>

[0080] Figure 7 (a) is a perspective view of the capacitor element assembly 10 according to Modification Example 1 with one insulating cover 800 removed. Figure 7 (b) is a side cross-sectional view of the film capacitor 1 in a state where the film capacitor 1 is cut at the center according to Modification Example 1. Figure 7 (b) shows the film capacitor 1 in a state before the case 500 is filled with the filling resin 600 .

[0081] In Modification 1, three insulating covers 800 are provided in capacitor element assembly 10. Insulating cover 800 corresponds to the "second insulating member" described in the claims.

[0082] The insulating cover 800 is made of a resin such as polyphenylene sulfide (PPS) and has insulating properties. The insulating cover 800 includes a bottom surface 810 and a peripheral surface 820 .

[0083] The bottom portion 810 has substantially the same shape and size as the end surface 101 of the capacitor element 100. The thickness of the bottom portion 810 is substantially equal to the gap between the second electrode terminal portion 320 of the second bus bar 300 and the inner bottom surface of the case 500 formed when the capacitor element assembly 10 is accommodated in the case 500.

[0084] The peripheral surface 820 includes: two flat portions 821; and an arc portion 822 connecting the front ends of these flat portions 821. The central portion of the arc portion 822 is a flat surface. The central portion of the two flat portions 821 and the arc portion 822 extends upward more than other portions. By setting the height of the peripheral surface 820, excluding the flat portion 821 and the central portion of the arc portion 822, to half the size (height) of the end face direction of the capacitor element 100, it is difficult to hinder the heat dissipation from the capacitor element 100.

[0085] The insulating cover 800 is inserted into the lower portion of the capacitor element 100 from below. As a result, the second end surface electrode 120 of the capacitor element 100 and the second electrode terminal portion 320 of the second bus bar 300 are covered by the bottom portion 810 of the insulating cover 800. Figure 7 As shown in (b), when the capacitor element assembly 10 is housed in the housing 500, the insulating cover 800 is interposed between the second end surface electrode 120 and the second electrode terminal portion 320 and the inner bottom surface of the housing 500 (the inner surface of the bottom portion 501).

[0086] According to the structure of the first modification, the second bus bar 300 and the metal case 500 are less likely to come into contact with each other, and the insulation between them is further ensured.

[0087] In addition, the insulating cover 800 is expected to be used when there is a concern about the contact between the second electrode terminal portion 320 of the second bus bar 300 and the inner bottom surface of the shell 500 due to the rigidity of the capacitor element assembly 10 and the installation accuracy in the shell 500. If this is not the case, it is expected that the insulating cover 800 will not be used if the heat dissipation of the capacitor element 100, product cost, etc. are taken into consideration.

[0088] <Other changes>

[0089] In the above embodiment, the mounting joint 430 of the insulating plate 400 is mounted on the mounting boss 520 of the housing 500 by means of screws 700. However, the mounting method of the mounting joint 430 to the mounting boss 520 is not limited thereto. Figure 8 In the structural example shown in (a), a protrusion 433 protruding downward is provided on the mounting joint 430, and a hole 523 corresponding to the protrusion 433 is provided on the mounting boss 520. Then, the mounting joint 430 is mounted on the mounting boss 520 by fitting the protrusion 433 into the hole 523 from above, and the insulating plate 400 is fixed to the housing 500. Figure 8 In the structural example shown in (b), a protrusion 524 protruding upward is provided on the mounting boss 520, and a hole 434 corresponding to the protrusion 524 is provided on the mounting joint 430. Then, the mounting joint 430 is mounted on the mounting boss 520 by fitting the protrusion 524 into the hole 434 from below, and the insulating plate 400 is fixed to the housing 500.

[0090] If set to Figure 8 (a) and Figure 8 According to the structure (b), the mounting connector 430 can be easily mounted on the mounting boss 520 without the need to tighten the screws.

[0091] In addition, in the above-mentioned embodiment, the mounting joint 430 is exemplified as the first mounting portion, and the mounting boss 520 is exemplified as the second mounting portion. However, as long as the capacitor element assembly 10 is arranged at a given position relative to the housing 500 and the first bus bar 200 and the second bus bar 300 are not in contact with the housing 500, the first mounting portion and the second mounting portion may be in any form, and the positions where the first mounting portion and the second mounting portion are provided may also be in any position.

[0092] Furthermore, in the above-mentioned embodiment, the capacitor element 100 is arranged in the housing 500 so that one end surface electrode (the second end surface electrode 120) is opposite to the inner bottom surface of the housing 500. However, the film capacitor 1 can also arrange the capacitor element in the housing so that the two end surface electrodes are opposite to the inner surface of the housing, such as the front side surface and the inner surface of the rear side surface. As an embodiment of this case, a mounting boss for mounting a mounting joint of an insulating plate is provided in the housing so that the first electrode terminal portion of the first bus bar connected to the first end surface electrode and the second electrode terminal portion of the second bus bar connected to the second end surface electrode do not contact the inner side surfaces of the housings that are opposite to each other.

[0093] Furthermore, in the above-described embodiment, three capacitor elements 100 are included in capacitor element assembly 10. However, the number of capacitor element 100 may be one, and can be changed as appropriate.

[0094] 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. Alternatively, 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.

[0095] 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.

[0096] In addition, the embodiments of the present invention can be modified in various ways as appropriate within the scope of the technical concept shown in the claims.

[0097] 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 structural members, and do not indicate absolute directions such as vertical directions and horizontal directions.

[0098] Industrial Applicability

[0099] The present invention is useful for capacitors used in various electronic devices, electrical devices, industrial devices, electronic devices in vehicles, and the like.

[0100] Description of Reference Numerals

[0101] 1 Film capacitor (capacitor)

[0102] 10 Capacitor Component Assembly

[0103] 100 Capacitor Elements

[0104] 110 1st end surface electrode (1st electrode)

[0105] 120 Second end surface electrode (second electrode)

[0106] 200 Bus Bar 1

[0107] 210 1st main body (1st area)

[0108] 300 Bus Bar 2

[0109] 310 Second main body (second area)

[0110] 320 Second electrode terminal portion (electrode connecting portion)

[0111] 400 Insulation plate (first insulating member)

[0112] 430 Mounting connector (1st mounting part)

[0113] 432 Mounting surface

[0114] 433 Protrusion

[0115] 434 holes

[0116] 500 Shell

[0117] 520 Mounting boss (second mounting portion)

[0118] 522 Mounting surface

[0119] 523 holes

[0120] 524 protrusion

[0121] 700 Screws

[0122] 800 Insulation cover (second insulation component)

Claims

1. A capacitor comprising a capacitor element assembly and a metal case for accommodating the capacitor element assembly, The capacitor element assembly comprises: Capacitor elements; a first electrode formed on one of the two end surfaces of the capacitor element; a second electrode formed on the other of the two end surfaces of the capacitor element; a first bus bar connected to the first electrode and having a first region; a second bus bar connected to the second electrode and having a second region facing the first region; and a first insulating member having insulating properties and interposed between the first region and the second region, The first insulating member has a first mounting portion. The first mounting portion is provided in a region of the first insulating member that is not sandwiched between the first bus bar and the second bus bar. The case has a second mounting portion, and the first mounting portion is mounted to the second mounting portion so that the capacitor element assembly is arranged at a predetermined position relative to the case and the first bus bar and the second bus bar are not in contact with the case.

2. The capacitor according to claim 1, wherein: The capacitor element is arranged in the housing in a direction such that the second electrode faces the inner bottom surface of the housing. The second bus bar includes an electrode connecting portion located between the second electrode and the inner bottom surface of the case and connected to the second electrode. The first mounting portion is mounted on the second mounting portion such that the electrode connecting portion does not contact the inner bottom surface of the case.

3. The capacitor according to claim 2, wherein: The second mounting portion includes a mounting surface parallel to the inner bottom surface of the housing. The first mounting portion includes a mounting surface that contacts a mounting surface of the second mounting portion. The distance between the mounting surface of the second mounting portion and the inner bottom surface of the case is made larger than the distance between the mounting surface of the first mounting portion and the surface of the electrode connecting portion facing the inner bottom surface of the case.

4. A capacitor comprising a capacitor element assembly and a metal case accommodating the capacitor element assembly, The capacitor element assembly comprises: Capacitor elements; a first electrode formed on one of the two end surfaces of the capacitor element; a second electrode formed on the other of the two end surfaces of the capacitor element; a first bus bar connected to the first electrode and having a first region; a second bus bar connected to the second electrode and having a second region facing the first region; and a first insulating member having insulating properties and interposed between the first region and the second region, The first insulating member has a first mounting portion. The housing has a second mounting portion, The first mounting portion is mounted on the second mounting portion so that the capacitor element assembly is arranged at a predetermined position relative to the housing and the first bus bar and the second bus bar are not in contact with the housing. The capacitor element is arranged in the housing in a direction such that the second electrode faces the inner bottom surface of the housing. The second bus bar includes an electrode connecting portion located between the second electrode and the inner bottom surface of the case and connected to the second electrode. The first mounting portion is mounted on the second mounting portion so that the electrode connecting portion does not contact the inner bottom surface of the housing, The second mounting portion includes a mounting surface parallel to the inner bottom surface of the housing. The first mounting portion includes a mounting surface that contacts a mounting surface of the second mounting portion. The distance between the mounting surface of the second mounting portion and the inner bottom surface of the case is made larger than the distance between the mounting surface of the first mounting portion and the surface of the electrode connecting portion facing the inner bottom surface of the case.

5. The capacitor according to any one of claims 2 to 4, wherein: The capacitor also has: A second insulating member having insulating properties and interposed between the electrode connecting portion and the inner bottom surface of the case.

6. The capacitor according to claim 1 or 4, wherein: The first mounting portion is mounted on the second mounting portion by screws.

7. The capacitor according to claim 1 or 4, wherein: The first mounting portion is mounted on the second mounting portion by fitting a protrusion provided on one of the first mounting portion and the second mounting portion into a hole provided on the other.

8. A capacitor comprising a capacitor element assembly and a metal case accommodating the capacitor element assembly, The capacitor element assembly comprises: Capacitor elements; a first electrode formed on one of the two end surfaces of the capacitor element; a second electrode formed on the other of the two end surfaces of the capacitor element; a first bus bar connected to the first electrode and having a first region; a second bus bar connected to the second electrode and having a second region facing the first region; and a first insulating member having insulating properties and interposed between the first region and the second region, The first insulating member has a first mounting portion. The housing has a second mounting portion, The first mounting portion is mounted to the second mounting portion by screws so that the capacitor element assembly is arranged at a predetermined position relative to the case and the first bus bar and the second bus bar are not in contact with the case.

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