JPWO2018198527A1 - Capacitor - Google Patents

Abstract

In the film capacitor, the first bus bar and the second bus bar each have a first overlap portion and a second overlap portion which overlap with each other in a normal direction at a position deviated from the first capacitor element in a normal direction of an opening surface where the case opens. A first insulating plate is interposed between the first overlapped portion and the second overlapped portion. The second capacitor element is disposed in the case so as to overlap the first overlap portion and the second overlap portion in the normal direction. The third bus bar includes a third electrode terminal portion overlapping the second overlap portion in the normal direction, and a second insulating plate is interposed between the second overlap portion and the third electrode terminal portion. [Selection diagram] FIG.

Description

  The present invention relates to a capacitor.

  Metallicon electrodes (end face electrodes) are formed on both end surfaces, and a plurality of capacitor elements, each of which has an external lead-out terminal (bus bar) connected to each metallikon electrode, are housed in a case having an open top surface. Patent Literature 1 discloses a metallized film capacitor that is filled with a film.

  In the metallized film capacitor of Patent Document 1, in order to reduce ESL (equivalent series inductance), a pair of external lead terminals are stacked with an insulating sheet (insulating plate) interposed therebetween.

JP-A-2005-103777

  In a so-called case mold type capacitor as disclosed in Patent Document 1, a configuration in which a plurality of capacitor element units including a capacitor element and a pair of bus bars are housed in one case and molded with a filling resin may be adopted. . Each capacitor element unit is incorporated in a different electronic circuit unit in a device (apparatus) on which a capacitor is mounted. With such a configuration, when a plurality of capacitor element units are used in one device, it is not necessary to provide a case for each capacitor element unit.

  However, when a plurality of capacitor element units are accommodated in one case, if the arrangement configuration of each capacitor element unit is not appropriate, the case becomes uselessly large, and the capacitor itself may be uselessly large. There is. It is also desirable that the ESL can be reduced as in the capacitor of Patent Document 1.

  In view of such a problem, an object of the present invention is to provide a capacitor that can be made compact and reduce ESL when a plurality of capacitor element units are housed in one case.

  A capacitor according to a main aspect of the present invention includes a first capacitor element having a first electrode and a second electrode, a first bus bar connected to the first electrode, and a capacitor connected to the second electrode. A first capacitor element unit including a second bus bar, a second capacitor element having a third electrode and a fourth electrode, and a third bus bar connected to the third electrode. A second capacitor element unit including a fourth bus bar connected to the fourth electrode, a case accommodating the first capacitor element unit and the second capacitor element unit, And a filling resin filled therein. Here, the first bus bar and the second bus bar overlap each other in the normal direction at a position deviated from the first capacitor element in a direction normal to an opening surface where the case opens. A first insulating portion is included between the first overlapping portion and the second overlapping portion, including a first overlapping portion and a second overlapping portion. Further, the second capacitor element is disposed in the case so as to overlap the first overlap portion and the second overlap portion in the normal direction. The third bus bar includes a third overlap portion overlapping the second overlap portion in the normal direction, and a second insulating portion is provided between the second overlap portion and the third overlap portion. Part intervenes.

  ADVANTAGE OF THE INVENTION According to this invention, when accommodating several capacitor element units in one case, the capacitor which can achieve compactness and reduction of ESL can be provided.

  The effects and significance of the present invention will become more apparent from the following description of the embodiments. However, the embodiment described below is merely an example when embodying the present invention, and the present invention is not limited to what is described in the following embodiment.

FIG. 1A is a perspective view of the film capacitor according to the embodiment as viewed from the upper front, and FIG. 1B is a diagram illustrating the film capacitor according to the embodiment with the filling resin removed. It is the perspective view seen from the front upper part. FIG. 2 is an exploded perspective view of the film capacitor according to the embodiment. FIG. 3A is a perspective view of the first capacitor element unit according to the embodiment as viewed from the lower rear, and FIG. 3B is a perspective view of the second capacitor element unit according to the embodiment. It is the perspective view seen from. FIG. 4A is a perspective view of a first bus bar according to the embodiment, and FIG. 4B is a perspective view of a second bus bar according to the embodiment. FIG. 5A is a perspective view of the first insulating plate according to the embodiment as viewed from the upper front, and FIG. 5B is a view of the first insulating plate according to the embodiment as viewed from the lower rear. FIG. FIG. 6A is a perspective view of a third bus bar according to the embodiment, and FIG. 6B is a perspective view of a fourth bus bar and an insulating sheet according to the embodiment. FIG. 7 is a perspective view of the case according to the embodiment as viewed from the upper rear side. FIG. 8 is a left side cross-sectional view of the film capacitor according to the embodiment, taken along the line AA 'in FIG. 1B. FIGS. 9A to 9C are cross-sectional views of main parts of a film capacitor according to a modification.

  Hereinafter, a film capacitor 1 which is an embodiment of the capacitor of the present invention will be described with reference to the drawings. For convenience, the front, rear, left, right, and up and down directions are added to each drawing as appropriate. It should be noted that the directions shown in the drawings only indicate relative directions of the film capacitor 1, and do not indicate absolute directions.

  In the present embodiment, the film capacitor 1 corresponds to a “capacitor” described in the claims. Further, the first capacitor element unit 10A corresponds to the “first capacitor element unit” described in the claims. Further, the second capacitor element unit 10B corresponds to a “second capacitor element unit” described in the claims. The first capacitor element 100 corresponds to the “first capacitor element” described in the claims. Further, the upper end face electrode 101 and the lower end face electrode 102 respectively correspond to the “first electrode” and the “second electrode” described in the claims. Further, the first bus bar 200 and the second bus bar 300 correspond to “first bus bar” and “second bus bar” described in claims, respectively. Furthermore, the first overlapping section 230 and the second overlapping section 330 respectively correspond to the “first overlapping section” and the “second overlapping section” described in the claims. Further, the first opening 231 and the second opening 331 correspond to the “first opening” and the “second opening”, respectively, in the claims. Further, the first insulating plate 400 corresponds to a “first insulating section” described in the claims. Further, the third opening 411 corresponds to a “third opening” described in the claims. Further, the first annular projection 412 and the second annular projection 413 correspond to the “first annular projection” and the “second annular projection”, respectively, in the claims. The second capacitor element 500 corresponds to the “second capacitor element” described in the claims. Further, the upper end face electrode 501 and the lower end face electrode 502 respectively correspond to a “third electrode” and a “fourth electrode” in the claims. Further, the third bus bar 600 and the fourth bus bar 700 correspond to “third bus bar” and “fourth bus bar” in claims, respectively. Further, the third electrode terminal portion 610 corresponds to a “third overlapping portion” described in the claims. Further, the electrode pin 611 corresponds to a “joining part” described in the claims. Further, the second insulating plate 800 corresponds to a “second insulating section” described in the claims. Further, the fourth opening 811 corresponds to a “fourth opening” described in the claims. Further, the fitting projection 812 corresponds to a “projection” described in the claims.

  However, the above description is intended only for the purpose of associating the structure of the claims with the structure of the embodiment, and the invention described in the claims is applied to the structure of the embodiment by the association. It is not limited at all.

  FIG. 1A is a perspective view of the film capacitor 1 according to the present embodiment as viewed from above from the front, and FIG. 1B is a state in which the filling resin 30 according to the present embodiment is removed. FIG. 2 is a perspective view of the film capacitor 1 of FIG.

  As shown in FIGS. 1A and 1B, the film capacitor 1 includes a capacitor assembly 10, a case 20 in which the capacitor assembly 10 is housed, and a thermosetting resin filled in the case 20 and cured in the case 20. And a filling resin 30 having the same properties. In a state where the inside of the case 20 is molded with the filling resin 30, the four first connection terminal portions 240 and the first sub connection terminal portions 250 of the first bus bar 200 and the four second connection terminal portions 340 of the second bus bar 300 are provided. The third connection terminal portion 630 of the third bus bar 600, the fourth connection terminal portion 730 of the fourth bus bar 700, and the fifth sub connection terminal portion 952 of the fifth bus bar 950 are exposed from the filling resin 30. Most of the capacitor assembly 10 buried in the filling resin 30 is protected from moisture and impact.

  FIG. 2 is an exploded perspective view of the film capacitor 1 according to the present embodiment. FIG. 3A is a perspective view of the first capacitor element unit 10A according to the present embodiment as viewed from the lower rear, and FIG. 3B is a second capacitor element unit according to the present embodiment. It is the perspective view which looked at 10B from lower back.

  The capacitor assembly 10 includes a first capacitor element unit 10A and a second capacitor element unit 10B. The first capacitor element unit 10A includes five first capacitor elements 100, a first bus bar 200, a second bus bar 300, and a first insulating plate 400, and the first capacitor element unit 10A has three A second capacitor element 500, a third bus bar 600, and a fourth bus bar 700 are included. The first capacitor element unit 10A and the second capacitor element unit 10B can be respectively incorporated in different electronic circuit units of an external device (not shown) on which the film capacitor 1 is mounted. The capacitor assembly 10 further includes a second insulating plate 800.

  First, the configuration of the first capacitor element unit 10A will be described.

  The first capacitor element unit 10A includes, in addition to the first capacitor element 100, the first bus bar 200, the second bus bar 300, and the first insulating plate 400, a third capacitor element 910, two fourth capacitor elements 920, A fifth capacitor element 930, a sixth capacitor element 940, a fifth bus bar 950, and a sixth bus bar 960 are included.

  As shown in FIG. 2 and FIG. 3A, the five first capacitor elements 100 are arranged such that both end surfaces thereof face up and down in the case 20, and the short sides thereof (horizontal direction in FIG. 2). It is arranged in. Each first capacitor element 100 is formed by stacking two metallized films obtained by evaporating aluminum on a dielectric film, winding or laminating the stacked metallized films, and pressing them flat. In each first capacitor element 100, an upper end face electrode 101 is formed on the upper end face by spraying a metal such as zinc, and a lower end face electrode 102 is formed on the lower end face also by spraying a metal such as zinc. Is formed.

  Although the first capacitor element 100 of the present embodiment was formed of a metallized film obtained by evaporating aluminum on a dielectric film, other metals such as zinc and magnesium were also evaporated. It may be formed by a metallized film. Alternatively, the first capacitor element 100 may be formed of a metallized film obtained by depositing a plurality of metals among these metals, or may be formed of a metalized film obtained by depositing an alloy of these metals. Is also good.

  The third capacitor element 910 is disposed in the case 20 to the right of the first capacitor element 100 at the right end, with both end faces facing up and down, and the fourth capacitor element 920, the fifth capacitor element 930, and the Six-capacitor element 940 is arranged between first capacitor element 100 and third capacitor element 910 in case 20 so that both end faces face up and down.

  The configuration of the third capacitor element 910, the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940 is the same as the configuration of the first capacitor element 100, and each has an upper end face electrode 911 on its upper end face. , 921, 931 and 941 are formed, and lower end surface electrodes 912, 922, 932 and 942 are formed on the lower end surface thereof. Although the third capacitor element 910 has the same capacitance and the same size as the first capacitor element 100, the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940 are more static than the first capacitor element 100. Small capacitance and small size.

  FIG. 4A is a perspective view of the first bus bar 200 according to the present embodiment.

  As shown in FIGS. 2, 3A and 4A, the first bus bar 200 is formed of a conductive material, for example, a copper plate, and has a first electrode terminal portion 210 and a first sub-electrode terminal portion. 220, a first overlapping portion 230, four first connection terminal portions 240, and a first sub connection terminal portion 250. The first bus bar 200 is formed by, for example, appropriately cutting and bending a single copper plate, and connects the first electrode terminal portion 210, the first sub electrode terminal portion 220, the first overlap portion 230, and the first connection portion. The terminal part 240 and the first sub-connection terminal part 250 are integrated.

  The first electrode terminal portion 210 has an elongated plate shape on the left and right. At the front edge of the first electrode terminal portion 210, ten electrode pins 211 are formed so as to be arranged in the left-right direction. The first electrode terminal section 210 contacts the upper end face electrodes 101 of the five first capacitor elements 100. Two electrode pins 211 are arranged on each upper end face electrode 101. The electrode pin 211 is joined to the corresponding upper end face electrode 101 of the first capacitor element 100 by a joining method such as soldering. Thereby, the first electrode terminal portion 210 of the first bus bar 200 is electrically connected to the upper end face electrodes 101 of the five first capacitor elements 100.

  The first sub electrode terminal portion 220 is formed to extend obliquely right forward from the right end of the first electrode terminal portion 210. Two electrode pins 221 are formed in the first sub-electrode terminal portion 220 at positions corresponding to the upper end electrode 911 of the third capacitor element 910, and correspond to each upper end electrode 921 of the two fourth capacitor elements 920. One electrode pin 222 is formed at each position. The two electrode pins 221 are joined to the upper end face electrode 911 of the third capacitor element 910 by a joining method such as soldering, and each electrode pin 222 is joined to the upper end face electrode 921 of each fourth capacitor element 920 by soldering or the like. Joined by a joining method. As a result, the first sub-electrode terminal portion 220 of the first bus bar 200 is electrically connected to the upper end face electrode 911 of the third capacitor element 910 and the upper end face electrodes 921 of the two fourth capacitor elements 920.

  The first overlapping portion 230 has a long plate shape on the left and right, and is provided so as to be one step higher behind the first electrode terminal portion 210. Six circular first openings 231 are formed in the first overlapping section 230 at predetermined intervals so as to be arranged in the left-right direction.

  The four first connection terminal portions 240 are formed so as to rise upward from the rear edge of the first overlapped portion 230, and the front and rear surfaces thereof face in the front-rear direction. Two first connection terminal portions 240 are provided on the left side of the first overlap portion 230, and the other two first connection terminal portions 240 are provided on the right side of the first overlap portion 230. Each of the first connection terminal portions 240 has a circular mounting hole 241 that penetrates the front and back. The first connection terminal 240 is electrically connected to a corresponding external terminal (not shown) by screwing using the mounting hole 241.

  The first sub-connection terminal portion 250 is formed so as to rise upward from the right end of the first sub-electrode terminal portion 220, and the front and back surfaces thereof face in the left-right direction. A circular mounting hole 251 penetrating the front and back is formed in the first sub connection terminal 250. The first sub-connection terminal section 250 is electrically connected to a corresponding external terminal (not shown) by screwing using the mounting hole 251.

  FIG. 4B is a perspective view of the second bus bar 300 according to the present embodiment.

  As shown in FIG. 2, FIG. 3A and FIG. 4B, the second bus bar 300 is formed of a conductive material, for example, a copper plate, and has a second electrode terminal portion 310, a second relay portion 320, , A second overlapping portion 330, and four second connection terminal portions 340. The second bus bar 300 is formed, for example, by appropriately cutting and bending a single copper plate, and these second electrode terminal portions 310, second relay portions 320, second overlapping portions 330, and second connection terminal portions are formed. 340 are integrated.

  The second electrode terminal portion 310 has an elongated plate shape on the left and right. Two electrode pins 311 corresponding to the left first capacitor element 100 are formed at a corner between the left edge and the front edge of the second electrode terminal portion 310. Eight electrode pins 311 corresponding to the four first capacitor elements 100 other than the left end are formed on the front edge of the second electrode terminal portion 310 so as to be arranged in the left-right direction. The second electrode terminal 310 contacts the lower end electrodes 102 of the five first capacitor elements 100. Two electrode pins 311 are arranged on each lower end face electrode 102. The electrode pin 311 is joined to the corresponding lower end face electrode 102 of the first capacitor element 100 by a joining method such as soldering. Thereby, the second electrode terminal portions 310 of the second bus bar 300 are electrically connected to the lower end surface electrodes 102 of the five first capacitor elements 100. Further, an electrode pin 312 corresponding to the fifth capacitor element 930 is formed on the right edge of the second electrode terminal portion 310. The electrode pin 312 is joined to the lower end face electrode 932 of the fifth capacitor element 930 by a joining method such as soldering. Thereby, the second electrode terminal portion 310 of the second bus bar 300 is electrically connected to the lower end face electrode 932 of the fifth capacitor element 930.

  The second relay section 320 relays between the second electrode terminal section 310 and the second overlap section 330. The second relay portion 320 has a long plate shape on the left and right, and extends upward from the rear edge of the second electrode terminal portion 310. In the second relay portion 320, a large number of circular circulation holes 321 are formed so as to line up, down, left, and right in order to distribute the molten resin 30.

  The second overlapping portion 330 has a long plate shape on the left and right, and extends rearward from the upper end edge of the second relay portion 320. Six circular second openings 331 are formed in the second overlapping portion 330 so as to be arranged in the left-right direction. The arrangement interval (pitch) between the adjacent second openings 331 is made equal to the arrangement interval between the adjacent first openings 231.

  The four second connection terminal portions 340 are formed so as to rise upward from the rear end edge of the second overlap portion 330, and the front and rear surfaces thereof face in the front-rear direction. Two second connection terminal portions 340 are provided at leftward positions of the second overlap portion 330, and the other two second connection terminal portions 340 are located at a center portion and a rightward position of the second overlap portion 330, respectively. Provided. Each of the second connection terminal portions 340 is formed with a circular mounting hole 341 penetrating the front and back. The second connection terminal portion 340 is electrically connected to a corresponding external terminal (not shown) by screwing using the mounting hole 341.

  In a state where the first capacitor element unit 10A is assembled, the second connection terminal portion 340 on the left end and the second connection terminal portion 340 second from the left end are connected to the first connection terminal portion 240 on the left end of the first bus bar 200. The second connection terminals 240 are disposed on the left of the second connection terminal 240 from the left end. In addition, the second connection terminal portion 340 at the right end is disposed to the left of the first connection terminal portion 240 at the right end in the first bus bar 200, and the second connection terminal portion 340 at the center portion is located from the right end in the first bus bar 200. On the left side of the second first connection terminal portion 240, a gap is arranged in which the third connection terminal portion 630 of the third bus bar 600 and the fourth connection terminal portion 730 of the fourth bus bar 700 are arranged.

  As shown in FIGS. 2 and 3A, the fifth bus bar 950 is formed of, for example, a copper plate and includes a fifth electrode terminal portion 951 and a fifth sub-connection terminal portion 952. In the fifth electrode terminal portion 951, two electrode pins 953 corresponding to the third capacitor element 910 and an electrode pin 954 corresponding to the sixth capacitor element 940 are formed. The two electrode pins 953 are joined to the lower end electrode 912 of the third capacitor element 910 by a joining method such as soldering, and the electrode pin 954 is joined to the lower end electrode 942 of the sixth capacitor element 940 by soldering or the like. Joined by a joining method. As a result, the fifth electrode terminal portion 951 of the fifth bus bar 950 is electrically connected to the lower end electrode 912 of the third capacitor element 910 and the lower end electrode 942 of the sixth capacitor element 940.

  In a state where the first capacitor element unit 10A is assembled, the fifth sub-connection terminal portions 952 are arranged next to the first sub-connection terminal portions 250 of the first bus bar 200. The fifth sub-connection terminal portion 952 has a circular mounting hole 955 penetrating the front and back. The fifth sub-connection terminal portion 952 is electrically connected to a corresponding external terminal (not shown) by screwing using the mounting hole 955. An insulating paper 956 is wound under the fifth sub-connection terminal portion 952 in order to ensure insulation between the fifth sub-connection terminal portion 952 and the upper end surface electrode 911 of the third capacitor element 910.

  As shown in FIGS. 2 and 3A, the sixth bus bar 960 is formed of, for example, a copper plate. The sixth bus bar 960 has an electrode pin 961 corresponding to each fourth capacitor element 920, an electrode pin 962 corresponding to the fifth capacitor element 930, and an electrode pin 963 corresponding to the sixth capacitor element 940. The electrode pin 961 is joined to the lower end electrode 922 of each fourth capacitor element 920 by a joining method such as soldering, and the electrode pin 962 is joined to the upper end electrode 931 of the fifth capacitor element 930 by soldering or the like. The electrode pin 963 is joined to the upper end face electrode 941 of the sixth capacitor element 940 by a joining method such as soldering. Accordingly, sixth bus bar 960 is electrically connected to lower end electrode 922 of each fourth capacitor element 920, upper end electrode 931 of fifth capacitor element 930, and upper end electrode 941 of sixth capacitor element 940. .

  The sixth bus bar 960 further has a sixth connection terminal portion 964. The sixth connection terminal portion 964 is formed with a circular mounting hole 965 penetrating the front and back. The sixth connection terminal portion 964 is arranged on the upper surface of the mounting tab 24 on the right side of the rear surface of the case 20. In this state, the mounting hole 965 of the sixth connection terminal portion 964 is aligned with the insertion hole 24a of the mounting tab 24.

  FIG. 5A is a perspective view of the first insulating plate 400 according to the present embodiment as viewed from the upper front, and FIG. 5B is a perspective view of the first insulating plate 400 according to the present embodiment. It is the perspective view seen from the back lower part.

  As shown in FIGS. 5A and 5B, the first insulating plate 400 is formed of an insulating resin material such as polyphenylene sulfide, acrylic, or silicon, and includes a main plate portion 410, a front plate portion 420, , A rear plate section 430. The main plate portion 410 has a horizontally long rectangular shape. The front plate portion 420 extends downward from the front edge of the main plate portion 410 and has a horizontally elongated rectangular shape. The rear plate portion 430 extends upward from the rear edge of the main plate portion 410 and has a horizontally elongated rectangular shape. The first insulating plate 400 is interposed between the first overlapping portion 230 of the first bus bar 200 and the second overlapping portion 330 of the second bus bar 300.

  Six circular third openings 411 are formed in the main plate portion 410 so as to be arranged in the left-right direction. The arrangement interval (pitch) between the adjacent third openings 411 is equal to the arrangement interval between the adjacent first openings 231 and the arrangement interval between the adjacent second openings 331. In addition, an annular first annular projection 412 is formed around the third opening 411 on the surface of the main plate portion 410 (the surface facing the first overlapping portion 230). The outer diameter of the first annular protrusion 412 is slightly smaller than the inner diameter of the first opening 231, and the height of the first annular protrusion 412 is slightly larger than the thickness of the first overlapped portion 230. . Further, on the back surface of the main plate portion 410 (the surface facing the second overlapping portion 330), an annular second annular projection 413 is formed around the third opening 411. The outer diameter of the second annular protrusion 413 is slightly smaller than the inner diameter of the second opening 331, and the height of the second annular protrusion 413 is slightly larger than the thickness of the second overlapped portion 330. .

  Next, the configuration of the second capacitor element unit 10B will be described.

  The second capacitor element unit 10B includes an insulating sheet 970 in addition to the second capacitor element 500, the third bus bar 600, and the fourth bus bar 700.

  As shown in FIG. 2 and FIG. 3B, the three second capacitor elements 500 are arranged such that both end faces thereof are oriented in the vertical direction in the case 20, and in the longitudinal direction (the horizontal direction in FIG. 2). Are arranged. The configuration of the second capacitor element 500 is the same as that of the first capacitor element 100. An upper end face electrode 501 is formed on the upper end face, and a lower end face electrode 502 is formed on the lower end face. The second capacitor element 500 has a smaller capacitance and a smaller size than the first capacitor element 100 and the third capacitor element 910, but is more static than the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940. Large capacity and large size.

  FIG. 6A is a perspective view of the third bus bar 600 according to the present embodiment.

  As shown in FIG. 2, FIG. 3A and FIG. 6A, the third bus bar 600 is formed of a conductive material, for example, a copper plate, and has a third electrode terminal portion 610, a third relay portion 620, , And a third connection terminal portion 630. The third bus bar 600 is formed, for example, by appropriately cutting and bending one copper plate, and the third electrode terminal portion 610, the third relay portion 620, and the third connection terminal portion 630 are integrated. I have.

  The third electrode terminal portion 610 has a long plate shape on the left and right. Six electrode pins 611 are formed on the front edge of the third electrode terminal portion 610 so as to be arranged in the left-right direction. The third electrode terminal portion 610 contacts the upper end electrodes 501 of the three second capacitor elements 500. Two electrode pins 611 are arranged on each upper end face electrode 501. The electrode pin 611 is joined to the corresponding upper end electrode 501 of the second capacitor element 500 by a joining method such as soldering. Thus, the third electrode terminal portion 610 of the third bus bar 600 is electrically connected to the upper end surface electrodes 501 of the three second capacitor elements 500. In addition, six circular flow holes 612 are formed in the third electrode terminal portion 610 so as to be arranged in the left-right direction in order to flow the filling resin 30 in a molten state.

  The third relay section 620 relays between the third electrode terminal section 610 and the third connection terminal section 630. The third relay portion 620 has a long and thin plate shape on the left and right, and extends upward from the rear edge of the third electrode terminal portion 610.

  The third connection terminal portion 630 is formed at the upper end edge of the third relay portion 620, and its front and back surfaces face the front-back direction. The third connection terminal portion 630 has a circular mounting hole 631 penetrating the front and back. The third connection terminal portion 630 is electrically connected to a corresponding external terminal (not shown) by screwing using the mounting hole 631. A wide portion 630b wider than the upper terminal portion 630a is formed below the third connection terminal portion 630.

  FIG. 6B is a perspective view of the fourth bus bar 700 and the insulating sheet 970 according to the present embodiment.

  As shown in FIG. 2, FIG. 3A and FIG. 6B, fourth bus bar 700 is formed of a conductive material, for example, a copper plate, and has fourth electrode terminal portion 710, fourth relay portion 720, , A fourth connection terminal portion 730. The fourth bus bar 700 is formed, for example, by appropriately cutting and bending a single copper plate, and the fourth electrode terminal portion 710, the fourth relay portion 720, and the fourth connection terminal portion 730 are integrated. I have.

  The fourth electrode terminal portion 710 has a long plate shape on the left and right. Two electrode pins 711 corresponding to the second capacitor element 500 at the left end are formed at a corner between the left edge and the front edge of the fourth electrode terminal portion 710. Two electrode pins 711 corresponding to the second capacitor element 500 at the right end are formed at a corner between the right end edge and the front end edge of the fourth electrode terminal portion 710. Further, two electrode pins 711 corresponding to the central second capacitor element 500 are formed at the center of the front edge of the fourth electrode terminal portion 710. The fourth electrode terminal portion 710 contacts the lower end electrodes 502 of the three second capacitor elements 500. Two electrode pins 711 are arranged on each lower end face electrode 502. The electrode pin 711 is joined to the corresponding lower end face electrode 502 of the second capacitor element 500 by a joining method such as soldering. Thus, the fourth electrode terminal portion 710 of the fourth bus bar 700 is electrically connected to the lower end surface electrodes 502 of the three second capacitor elements 500.

  The fourth relay section 720 relays between the fourth electrode terminal section 710 and the fourth connection terminal section 730. The fourth relay section 720 has a substantially trapezoidal plate shape, and extends upward from the rear edge of the fourth electrode terminal section 710. Six circular flow holes 721 are formed in the fourth relay portion 720 so as to line up, down, left, and right in order to flow the filled resin 30 in a molten state.

  The fourth connection terminal portion 730 is formed at the upper end edge of the fourth relay portion 720, and its front and back surfaces face the front-back direction. The fourth connection terminal portion 730 has a circular mounting hole 731 penetrating the front and back. The fourth connection terminal portion 730 is electrically connected to a corresponding external terminal (not shown) by screwing using the mounting hole 731. A wide portion 730b wider than the upper terminal portion 730a is formed below the fourth connection terminal portion 730.

  In a state where the second capacitor element unit 10B is assembled, the terminal portions 630a of the third connection terminal portions 630 and the terminal portions 730a of the fourth connection terminal portions 730 are arranged in the left-right direction. The wide portion 630b of the third connection terminal portion 630 and the wide portion 730b of the fourth connection terminal portion 730 overlap in the front-rear direction. Due to the overlap between the wide portions 630b and 730b, a reduction in ESL (equivalent series inductance) in the second capacitor element unit 10B is expected. Further, as shown in FIG. 1A, in a state where the film capacitor 1 is completed, a third connection terminal 240 between the second connection terminal 240 from the right end and the second connection terminal 340 at the center is provided. The connection terminal part 630 and the fourth connection terminal part 730 are arranged.

  The insulating sheet 970 is formed of insulating paper, acrylic, or a resin material having an insulating property such as silicon. The insulating sheet 970 has a substantially horizontally long rectangular shape, and its central portion is once bent backward and then bent downward so as to conform to the shape of the fourth bus bar 700. As shown by the broken line in FIG. 6B, the insulating sheet 970 is attached to the fourth bus bar 700 so as to straddle the upper part of the fourth relay part 720 and the wide part 730b of the fourth connection terminal part 730. . The insulating sheet 970 insulates between the wide portion 630b of the third connection terminal portion 630 and the wide portion 730b of the fourth connection terminal portion 730.

  Next, the configuration of the second insulating plate 800 will be described.

  As shown in FIG. 2A, the second insulating plate 800 is formed of an insulating resin material such as polyphenylene sulfide, acrylic, or silicon, and has a main plate portion 810, a front plate portion 820, and a left plate portion. 830, a right plate part 840, and a rear plate part 850. The main plate portion 810 has a horizontally long rectangular shape. The front plate portion 820, the left plate portion 830, and the right plate portion 840 each extend downward from the front edge, the left edge, and the right edge of the main plate portion 810, and have a horizontally elongated rectangular shape. The rear plate portion 850 extends upward from the rear edge of the main plate portion 810 and has a horizontally elongated rectangular shape.

  The second insulating plate 800 is substantially in contact with three capacitors whose inner surfaces of the front plate portion 820, the left plate portion 830, and the right plate portion 840 are arranged in the left-right direction. The positioning of the insulating plate 800 is performed.

  Six circular fourth openings 811 are formed in the main plate 810 so as to be arranged in the left-right direction. The arrangement interval (pitch) between the adjacent fourth openings 811 is equal to the arrangement interval between the adjacent third openings 411 in the first insulating plate 400 and the arrangement interval between the adjacent electrode pins 611 in the third bus bar 600. Is done. An annular fitting projection 812 is formed around the fourth opening 811 on the surface of the main plate portion 810 (the surface facing the second overlap portion 330). The outer diameter of the fitting protrusion 812 is slightly smaller than the inner diameter of the third opening 411. The height of the fitting projection 812 is set to be larger than the total thickness of the thickness of the second overlapping portion 330 and the thickness of the main plate portion 410 of the first insulating plate 400.

  Next, the configuration of the case 20 will be described.

  FIG. 7 is a perspective view of the case 20 according to the present embodiment as viewed from the upper rear side.

  As shown in FIGS. 2 and 7, the case 20 is formed of a resin material such as polyphenylene sulfide. The case 20 is a substantially rectangular parallelepiped that is long to the left and right, but is formed in a box-like shape in which the rear central portion slightly protrudes rearward, and the upper surface is open as an opening surface 20a. A region extending rearward in the case 20 is a region where the second capacitor element unit 10B is arranged. In the case 20, a space where the capacitor elements 100, 500, 910, 920, 930, and 940 are not arranged is filled with this space to reduce the amount of the filling resin 30. A second spacer portion 22 and a third spacer portion 23 are provided. Further, outside the case 20, mounting tabs 24 are formed at four places on the front side and three places on the rear side. Each mounting tab 24 is formed with an insertion hole 24a penetrating vertically. A metal collar 25 is fitted into the insertion hole 24a to increase the strength of the hole. When the film capacitor 1 is installed on the installation part of the external device, these mounting tabs 24 are fixed to the installation part by screws or the like.

  FIG. 8 is a left side sectional view of the film capacitor 1 according to the present embodiment, taken along a line AA ′ in FIG. 1B. In FIG. 8, the position of the upper surface of the filling resin 30 is indicated by a dashed line.

  As shown in FIG. 8, in the case 20, the first overlap portion 230 of the first bus bar 200 and the second overlap portion 330 of the second bus bar 300 move in the vertical direction, that is, the normal direction of the opening surface 20 a of the case 20. Are vertically overlapped via the first insulating plate 400 at positions separated from the five first capacitor elements 100. Thereby, ESL (equivalent series inductance) in the first capacitor element unit 10A can be reduced. In addition, the first overlap portion 230 and the second overlap portion 330 are insulated by the first insulating plate 400.

  Here, the first annular protrusion 412 formed on the surface of the main plate 410 of the first insulating plate 400 fits into the first opening 231 formed in the first overlapped portion 230 of the first bus bar 200. In addition, the second annular protrusion 413 formed on the back surface of the main plate portion 410 of the first insulating plate 400 fits into the second opening 331 formed in the second overlapping portion 330 of the second bus bar 300. Thereby, the first bus bar 200 and the second bus bar 300 are positioned in the front-rear and left-right directions with respect to the first insulating plate 400, and are difficult to move in the front-rear and left-right directions. In addition, the first annular protrusion 412 that exists between the periphery of the third opening 411 and the periphery of the first opening 231, and exists between the periphery of the third opening 411 and the periphery of the second opening 331. The second annular projecting portion 413 reduces the creepage distance between the first overlapping portion 230 and the second overlapping portion 330 through the third opening 411 by using the first annular projecting portion 412 and the second annular projecting portion 413. , And the insulating property between the first bus bar 200 and the second bus bar 300 can be increased.

  Further, in the case 20, the second capacitor is located at a position directly below the overlapped first overlap portion 230 and second overlap portion 330, that is, at a position vertically overlapping the first overlap portion 230 and the second overlap portion 330. The three second capacitor elements 500 of the element unit 10B are arranged. Then, a second insulating plate 800 is interposed between the second overlapped portion 330 and the third electrode terminal portion 610 of the third bus bar 600 overlapping the second overlapped portion 330, and the second overlapped portion 330, the third electrode terminal portion 610, Is insulated. As described above, in the present embodiment, the space formed between the first and second overlapping sections 230 and 330 and the bottom surface of case 20 can be effectively used as an area where second capacitor element 500 is arranged.

  Further, the fitting protrusion 812 of the second insulating plate 800 is fitted into the third opening 411 of the first insulating plate 400. Accordingly, the second insulating plate 800 is positioned in the front, rear, left, and right directions with respect to the first insulating plate 400, and becomes difficult to move in the front, rear, left, and right directions.

  Further, since the fitting protrusion 812 is fitted into the third opening 411, the first opening 231, the second opening 331, the third opening 411, and the fourth opening 811 overlap in the vertical direction. Each electrode pin 611 of the third electrode terminal portion 610 is located in each fourth opening 811 of the main plate portion 810 of the second insulating plate 800, and the first opening 231, the second opening 331, and the The third opening 411 and the fourth opening 811 are exposed above the first bus bar 200 through a communication path P formed by overlapping. Thereby, it is possible to join each electrode pin 611 and the corresponding upper end electrode 501 of the second capacitor element 500 through the communication path P by soldering or the like. Therefore, in a state where the first capacitor element unit 10A and the second capacitor element unit 10B are combined, each electrode pin 611 of the second capacitor element unit 10B and the corresponding upper end face electrode 501 of the second capacitor element 500 are Can be performed at one time together with the connection between the electrode pins 211 of the first bus bar 200 and the corresponding upper end electrode 101 of the first capacitor element 100 in the first capacitor element unit 10A. . Further, since the bonding agent S such as solder applied to each electrode pin 611 is accommodated in the communication path P, the bonding agent S applied between the second insulating plate 800 and the third electrode terminal portion 610 is provided. Therefore, it is not necessary to provide a gap corresponding to the distance. Further, when the molten filling resin 30 is injected into the case 20, the injected filling resin 30 passes through the communication path P and spreads over the portion of the second capacitor element 500 below the second insulating plate 800. It will be easier.

  In addition, the front plate portion 420 of the first insulating plate 400 is interposed between the second relay portion 320 of the second bus bar 300 and the peripheral surface of the first capacitor element 100. Thereby, the creeping distance between the second relay section 320 of the second bus bar 300 and the upper end face electrode 101 of the first capacitor element 100 can be increased. Further, the front plate portion 820 of the second insulating plate 800 is interposed between the second relay portion 320 of the second bus bar 300 and the peripheral surface of the second capacitor element 500. Thereby, the creeping distance between the second relay portion 320 of the second bus bar 300 and the upper end surface electrode 501 of the second capacitor element 500 can be increased. Further, a lower portion of the insulating sheet 970 is interposed between the fourth relay portion 720 of the fourth bus bar 700 and the peripheral surface of the second capacitor element 500. Thereby, the creeping distance between the fourth relay portion 720 of the fourth bus bar 700 and the upper end surface electrode 501 of the second capacitor element 500 can be increased.

<Effects of Embodiment>
As described above, according to the present embodiment, the following effects can be obtained.

  Since the first bus bar 200 and the second bus bar 300 are provided with the first overlapping portion 230 and the second overlapping portion 330, which overlap each other, the ESL in the first capacitor element unit 10A can be reduced.

  In addition, the space formed between the first and second overlapping sections 230 and 330 and the bottom surface of the case 20 can be effectively used as an arrangement area for the second capacitor element 500. When the second capacitor element unit 10B is accommodated in one case 20, the size of the case 20 can be made compact. Thereby, the size of the film capacitor 1 can be made compact.

  Further, each electrode pin 611 of the third bus bar 600 is located in each fourth opening 811 of the second insulating plate 800, and the first opening 231, the second opening 331, the third opening 411, and the fourth Since each of the electrode pins 611 and the upper end surface electrode 501 of each of the second capacitor elements 500 can be joined through the communication path P because the electrode pins 611 are exposed above the first bus bar 200 through the communication path P formed by the overlap of the openings 811. . Thereby, each electrode pin 611 in the second capacitor element unit 10B and the upper end electrode 501 of each second capacitor element 500 are joined to each electrode pin 211 of the first bus bar 200 in the first capacitor element unit 10A. This can be performed once at the same time as bonding the first capacitor element 100 to the upper end face electrode 101 and the like.

  Furthermore, since the bonding agent S such as solder mounted on each electrode pin 611 of the third bus bar 600 is accommodated in the communication path P, the bonding agent S is mounted between the second insulating plate 800 and the third electrode terminal portion 610. It is not necessary to provide a gap for the bonding agent S. Accordingly, the height of the second overlapped portion 330 of the second bus bar 300 and the first overlapped portion 230 of the first bus bar 200 overlapping the third electrode terminal portion 610 from the bottom surface of the case 20 is suppressed, so that the height of the case 20 is reduced. Can be suppressed from becoming high.

  Further, since the second insulating plate 800 is provided with the fitting protrusion 812 that is fitted into the third opening 411 of the first insulating plate 400, the second insulating plate 800 is attached to the first insulating plate 400. Positioning can be performed in the front-rear, left-right directions, and the second insulating plate 800 is less likely to move in the front-rear, left-right directions.

  Further, the first annular protrusion 412 existing between the periphery of the third opening 411 and the periphery of the first opening 231 allows the first overlapped portion 230 and the second overlapped portion 330 to pass through the third opening 411. Between the first bus bar 200 and the second bus bar 300 can be increased. Similarly, the first overlapped portion 230 and the second overlapped portion through the third opening 411 are also provided by the second annular protrusion 413 existing between the periphery of the third opening 411 and the periphery of the second opening 331. Since the creepage distance between the first bus bar 200 and the second bus bar 300 can be increased, the insulating property between the first bus bar 200 and the second bus bar 300 can be increased.

<Example of change>
As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments. It is possible.

  For example, in the above embodiment, in the main plate portion 410 of the first insulating plate 400, the first annular protrusion 412 is formed around the third opening 411 on the surface thereof, and the third opening 411 on the back surface thereof is formed. A second annular projection 413 was formed around the periphery. However, if the creepage distance between the first overlap portion 230 of the first bus bar 200 and the second overlap portion 330 of the second bus bar 300 through the third opening 411 can be properly secured, FIG. As shown in FIG. 9B, a configuration in which the second annular projection 413 is not provided may be adopted, or a configuration in which the first annular projection 412 is not provided as shown in FIG. 9B may be adopted. . Further, as shown in FIG. 9C, a configuration in which both the first annular projection 412 and the second annular projection 413 are not provided may be adopted. 9A, the inner diameter of the second opening 331 of the second bus bar 300 is made slightly larger than the outer diameter of the fitting protrusion 812 of the second insulating plate 800, so that Two bus bars 300 are positioned with respect to second insulating plate 800. 9B, the inner diameter of the first opening 231 of the first bus bar 200 is made slightly larger than the outer diameter of the fitting protrusion 812, so that the first bus bar 200 is formed. It is positioned with respect to second insulating plate 800. 9C, the inner diameter of the first opening 231 and the inner diameter of the second opening 331 are made slightly larger than the outer diameter of the fitting protrusion 812, so that the first opening 231 is formed. Bus bar 200 and second bus bar 300 are positioned with respect to second insulating plate 800.

  In the above-described embodiment, the first capacitor element unit 10A includes the third capacitor element 910, the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940. At least one of these capacitor elements 910, 920, 930, 940 may not be included in capacitor element unit 10A. In this case, the first capacitor element unit 10A may not include the fifth bus bar 950 or the sixth bus bar 960, and the first bus bar 200 may include the first sub-electrode terminal portion 220 or the first sub-connection terminal portion 250. May not be provided.

  Furthermore, in the above-described embodiment, the first capacitor element unit 10A includes five first capacitor elements 100, and the second capacitor element unit 10B includes three second capacitor elements 500. However, the number of the first capacitor element 100 and the second capacitor element 500 can be changed as appropriate, including the case where the number is one. Similarly, the numbers of the third capacitor element 910, the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940 may be appropriately changed.

  Furthermore, in the above embodiment, the first capacitor element 100, the second capacitor element 500, the third capacitor element 910, the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940 have their both end faces. , Are arranged in the case 20 so as to face the vertical direction, that is, the normal direction of the opening surface 20 a of the case 20. However, these capacitor elements 100, 500, 910, 920, 930, and 940 may be arranged in the case 20 such that both end faces face the front-back direction, that is, the direction orthogonal to the normal direction.

  Further, in the above embodiment, the first capacitor element 100, the second capacitor element 500, the third capacitor element 910, the fourth capacitor element 920, the fifth capacitor element 930, and the sixth capacitor element 940 are formed on a dielectric film. It is formed by laminating two metallized films on which aluminum is deposited and winding or laminating the laminated metallized films. In addition, aluminum is deposited on both surfaces of the dielectric film. These capacitor elements 100, 500, 910, 920, 930, and 940 may be formed by stacking and winding or laminating a metallized film and an insulating film.

  Furthermore, in the above embodiment, six electrode pins 611 are formed on the third electrode terminal portion 610 of the third bus bar 600, and the first bus bar 200, the second bus bar 300, and the first insulating plate 400 The six first opening 231, the second opening 331, the third opening 411, and the fourth opening 811 are formed in the first and second insulating plates 800, respectively. However, the number of the electrode pins 611 can be appropriately changed according to the number of the second capacitor elements 500 and the like, and accordingly, the first opening 231, the second opening 331, and the third opening 331 are adjusted accordingly. The number of 411 and fourth openings 811 is also changed.

  Further, in the above-described embodiment, the film capacitor 1 has been described as an example of the capacitor of the present invention. However, the present invention can be applied to capacitors other than the film capacitor 1.

  In addition, various changes can be made to the embodiments of the present invention as appropriate within the scope of the technical idea described in the claims.

  In the description of the above embodiments, terms indicating directions such as “upward” and “downward” indicate relative directions that depend only on the relative positional relationship of the constituent members, and include vertical and horizontal directions. It does not indicate an absolute direction such as.

  INDUSTRIAL APPLICABILITY The present invention is useful for capacitors used for various electronic devices, electric devices, industrial devices, electric devices of vehicles, and the like.

1 Film capacitors (capacitors)
10A First capacitor element unit (first capacitor element unit)
10B Second capacitor element unit (second capacitor element unit)
Reference Signs List 20 case 30 filled resin 100 first capacitor element (first capacitor element)
101 Upper end face electrode (first electrode)
102 lower end face electrode (second electrode)
200 1st bus bar (1st bus bar)
230 1st polymerization part (1st polymerization part)
231 First Opening (First Opening)
300 Second busbar (second busbar)
330 Second polymerization part (second polymerization part)
331 second opening (second opening)
400 first insulating plate (first insulating part)
411 Third opening (third opening)
412 First annular projection (first annular projection)
413 Second annular projection (second annular projection)
500 Second capacitor element (second capacitor element)
501 Upper end electrode (third electrode)
502 Lower end face electrode (fourth electrode)
600 Third busbar (third busbar)
610 Third electrode terminal portion (third overlapping portion)
611 electrode pin (joint)
700 4th bus bar (4th bus bar)
800 second insulating plate (second insulating portion)
811 4th opening (4th opening)
812 Fitting projection (projection)

Claims (5)

A first capacitor element having a first electrode and a second electrode; a first bus bar connected to the first electrode; and a second bus bar connected to the second electrode. A first capacitor element unit;
A second capacitor element having a third electrode and a fourth electrode; a third bus bar connected to the third electrode; and a fourth bus bar connected to the fourth electrode. A second capacitor element unit;
A case in which the first capacitor element unit and the second capacitor element unit are accommodated;
And a filling resin filled in the case,
Each of the first bus bar and the second bus bar overlaps each other in the normal direction at a position deviated from the first capacitor element in a direction normal to an opening surface of the case. Part and a second polymerization part,
A first insulating portion is interposed between the first overlapping portion and the second overlapping portion,
The second capacitor element is disposed in the case so as to overlap the first overlap portion and the second overlap portion in the normal direction,
The third bus bar includes a third overlap portion overlapping the second overlap portion in the normal direction,
A second insulating portion is interposed between the second overlap portion and the third overlap portion,
A capacitor characterized in that: The capacitor according to claim 1,
The first overlapping portion, the second overlapping portion, the first insulating portion, and the second insulating portion have a first opening and a second opening at positions overlapping each other in the normal direction. An opening, a third opening and a fourth opening are provided;
The third overlapping portion includes a joining portion located in the fourth opening and joined to the second electrode.
A capacitor characterized in that: The capacitor according to claim 2,
The second insulating portion is provided around the fourth opening, protrudes toward the third opening, and includes a protrusion into which the third opening is fitted.
A capacitor characterized in that: The capacitor according to claim 2 or 3,
The first insulating portion includes a first annular projection provided around the third opening on the surface facing the first overlapping portion and inside the first opening, and the second insulating portion. And at least one second annular projection provided around the third opening on the surface facing the overlapping portion of the second opening and inside the second opening.
A capacitor characterized in that: The capacitor according to claim 4,
The first insulating portion includes both the first annular protrusion and the second annular protrusion.
A capacitor characterized in that:

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