Capacitor

Abstract

A capacitor comprises a plurality of capacitor elements aligned in a first direction, a first busbar, and a second busbar. Each of the plurality of capacitor elements comprises an element body, a first electrode, and a second electrode. The first busbar comprises a first internal terminal connected to the first electrode, a first external terminal, and a first connecting element that links the first internal terminal to the first external terminal. The first connecting element comprises a side plate positioned on one side of the plurality of capacitor elements in a second direction orthogonal to the first direction.A capacitor element located at the position furthest from the first external terminal in the first direction among the multitude of capacitor elements is located at the position closest to the side plate of the first connecting part in the second direction.

Description

Background 1. Technical field

[0001] The present disclosure relates generally to a capacitor and in particular to a capacitor comprising a plurality of capacitor elements. 2. Description of the related technology

[0002] PTL 1 discloses an energy conversion device. The energy conversion device comprises a plurality of semiconductor switching elements, a reactor, a low-voltage capacitor, a high-voltage capacitor, a charging and discharging capacitor, and a control device that controls the driving of the plurality of semiconductor switching elements at a predetermined driving frequency. List of cited documents Patent literature

[0003] PTL 1: Unexamined Japanese patent publication no. 2018-007325 Summary

[0004] In the energy conversion device of PTL 1, the charging and discharging capacitor is formed by connecting a large number of capacitor elements in parallel via first and second wiring. This leads to the problem that fluctuations in the heat generation of the large number of capacitor elements can easily occur.

[0005] The present disclosure relates to a capacitor that is able to reduce fluctuations in the heat generation of a plurality of capacitor elements.

[0006] A capacitor according to one aspect of the present disclosure comprises a plurality of capacitor elements aligned in a first direction, a first busbar, and a second busbar. Each of the plurality of capacitor elements comprises an element body, a first electrode located at one end of the element body, and a second electrode located at the other end of the element body. The first busbar comprises a first internal terminal connected to the first electrode, a first external terminal to be connected to an external device, and a first connecting part connecting the first internal terminal to the first external terminal. The first connecting part extends in the first direction.The first connecting part comprises a side plate positioned on one side of the plurality of capacitor elements in a second direction orthogonal to the first. The second busbar comprises a second internal terminal connected to the second electrode, a second external terminal to be connected to the external device, and a second connecting part connecting the second internal terminal to the second external terminal. A capacitor element located at a position furthest from the first external terminal in the first direction, among the plurality of capacitor elements, is positioned at a position closest to the side plate of the first connecting part in the second direction.

[0007] According to the present disclosure, the fluctuations in heat generation of the plurality of capacitor elements can be reduced. Brief description of the drawings Fig. Figure 1 is a perspective view showing a capacitor according to a first embodiment; Fig. Figure 2 is a perspective view showing a capacitor (but without housing and sealing section) according to the first embodiment; Fig. Figure 3 is a perspective exploded view showing the capacitor according to the first embodiment; Fig. Figure 4 is a top view showing the capacitor according to the first embodiment; Fig. Figure 5 is a view from below showing the capacitor according to the first embodiment; Fig. Figure 6 is a perspective view showing a capacitor according to a second embodiment; Fig. Figure 7 is a perspective exploded view showing the capacitor according to the second embodiment; Fig. Figure 8 is a top view showing the capacitor according to the second embodiment; Fig. Figure 9 is a view from below showing the capacitor according to the second embodiment; Fig. Figure 10 is a perspective view showing a capacitor according to a third embodiment; Fig. Figure 11 is a perspective exploded view showing the capacitor according to the third embodiment; Fig. Figure 12 is a top view showing the capacitor according to the third embodiment; and Fig. Figure 13 is a view from below showing the capacitor according to the third embodiment. Detailed description of implementation examples 1. Overview

[0008] As in the Fig. As shown in Figures 1 to 5, the capacitor 1 according to the present embodiment comprises a plurality of capacitor elements 2 aligned in one direction (left-right direction), a first busbar 31 and a second busbar 32.

[0009] The distance (current path) between each capacitor element 2 and the first external terminal 51 of the first busbar 31 differs depending on the position of the capacitor element 2. For example, the current path between the first capacitor element 2a and the first external terminal 51 is the longest, and the current path between the fourth capacitor element 2d and the first external terminal 51 is the shortest.

[0010] If there is a gap between the side plate 601 (see Fig. 3) Since the first connecting part 61 of the first busbar 31 and the capacitor elements 2 is the same for all capacitor elements 2, a resonant frequency derived from an electrostatic capacitance of the capacitor element 2 and an inductance of the current path for the capacitor element 2 cannot be the same in all capacitor elements 2. As a result, fluctuations in the heat generation of the multiple capacitor elements 2 easily occur.

[0011] In the present embodiment, the capacitor element 2 (first capacitor element 2a), which among the plurality of capacitor elements 2 is furthest from the first external terminal 51, is arranged in a position closest to the side plate 601 of the first connecting part 61. Thus, the magnetic flux generated by a current flowing through the first capacitor element 2a and the magnetic flux generated by a current flowing through the side plate 601 of the first connecting part 61 cancel each other out. Therefore, the inductances of all current paths of the plurality of capacitor elements 2 can be easily matched.

[0012] This allows the resonant frequency, derived from the electrostatic capacitance of capacitor element 2 and the inductance of the current path for capacitor element 2, to be adjusted across the multitude of capacitor elements 2. Since this results in virtually no impedance or phase difference across the entire frequency range, it is possible to suppress fluctuations in the current flowing through each capacitor element 2.

[0013] Accordingly, according to the present embodiment, the fluctuations in the heat generation of the plurality of capacitor elements 2 can be reduced. 2. Details (1) First embodiment

[0014] In the following, capacitor 1 is described according to a first embodiment with reference to the Fig. Figures 1 to 5 are described. Each drawing is a schematic view, and the ratio of a size and thickness of each configuration element in each drawing does not necessarily reflect an actual size ratio.

[0015] An arrow indicating every direction in every drawing does not serve to define a direction of capacitor 1 at the time of use, but is merely drawn for better understanding of the description and does not correspond to a unit.

[0016] An up-down direction is a direction that runs between the first electrode 21 and the second electrode 22 of the capacitor element 2. A side that is close to the second electrode 22 is referred to as the "top", and a side that is close to the first electrode 21 is referred to as the "bottom". Viewing along the up-down direction can be referred to as the "top view".

[0017] A left-right direction is a direction in which the multitude of capacitor elements 2 are aligned. Viewing along the left-right direction can be referred to as a "side view".

[0018] A forward-backward direction is a direction in which the capacitor element 2 and the side plate 601 of the first connecting part 61 of the first busbar 31 are aligned (see Fig. 4) A side located near capacitor element 2 is referred to as the "front," and a side located near side plate 601 is referred to as the "back." The view along the forward-backward direction can be referred to as the "front view."

[0019] As in Fig. As shown in Figure 2, the capacitor 1 according to the first embodiment comprises the plurality of capacitor elements 2, a first busbar 31 and a second busbar 32. The capacitor 1 may further comprise an insulating element 7. As shown in Figure 2, the capacitor 1 comprises the plurality of capacitor elements 2, a first busbar 31 and a second busbar 32. Fig. As shown in Figure 1, the capacitor 1 can further comprise a housing 8 and a sealing section 9. The configuration elements are described in turn below. <kondensatorelement>

[0020] The plurality (four in the present embodiment) of capacitor elements 2 are aligned in a first direction (left-right direction). In a case where four capacitor elements 2 are distinguished from one another, the capacitor elements 2 can be designated as first capacitor element 2a, second capacitor element 2b, third capacitor element 2c and fourth capacitor element 2d in the order from left to right.

[0021] Capacitor element 2 is a major component of capacitor 1. Capacitor element 2 is not specifically restricted, and examples include a wound capacitor element and a film capacitor element.

[0022] In particular, the capacitor element 2 comprises an element body 20, a first electrode 21 and a second electrode 22. <<Elementkörper> >

[0023] Element body 20 has a rounded rectangular shape in plan view and a rectangular shape in front and side views. However, the shape of element body 20 is not specifically restricted. Examples of the shape of element body 20 include a columnar shape, an elliptical columnar shape, and a rectangular cuboid shape.

[0024] The element body 20 has a first end surface 201, a second end surface 202, and an outer circumferential surface 203. The first end surface 201 is a bottom surface and has a rounded rectangular shape in plan view (see Fig. 5) The second end surface 202 is a top surface and, in plan view, has a rounded rectangular shape similar to the first end surface 201 (see Fig. 4) The outer circumferential surface 203 is a surface that connects an outer circumferential edge of the first end surface 201 and an outer circumferential edge of the second end surface 202 (see Fig. 2) The outer circumferential surface 203 has a flat surface 23 and a flat surface 24. The flat surface 23 is a flat surface facing a left side, and the flat surface 24 is a flat surface facing a right side (see Fig. 4 and Fig. 5) As described above, the element body 20 comprises two flat surfaces 23 and 24 that are parallel to each other.

[0025] The element body 20 comprises a dielectric film, a first internal electrode, and a second internal electrode. Inside the element body 20, the first and second internal electrodes are positioned opposite each other, with the dielectric film between them. The first and second internal electrodes are deposited on the dielectric film. As described above, capacitor 1 is a film capacitor. Note that the representations of the first and second internal electrodes are omitted.

[0026] The material of the dielectric film is not specifically restricted and includes, for example, polypropylene (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), and polystyrene (PS). The outer circumferential surface 203 of the element body 20 can consist of a dielectric film or of an element with a different electrical insulating property than the dielectric film.

[0027] Part of the first internal electrode is exposed at the first end face 201 of the element body 20 and not exposed at the second end face 202. Conversely, part of the second internal electrode is exposed at the second end face 202 of the element body 20 and not exposed at the first end face 201. The materials of the first and second internal electrodes are not specifically restricted and include, for example, aluminum (Al), gold (Au), magnesium (Mg), zinc (Zn), tin (Sn), nickel (Ni), chromium (Cr), iron (Fe), copper (Cu), titanium (Ti), and alloys thereof. <<Erste Elektrode> >

[0028] The first electrode 21 is arranged at one end of the element body 20 (see Fig. 5) In particular, the first electrode 21 is arranged on the first end face 201 of the element body 20.

[0029] The first electrode 21 is formed by spraying a metal onto the first end face 201 of the element body 20. This electrically connects the first electrode 21 to the first internal electrode. The metal forming the first electrode 21 is not specifically restricted, and examples include zinc (Zn), tin (Sn), and alloys thereof. <<Zweite Elektrode> >

[0030] The second electrode 22 is arranged at the other end of the element body 20 (see Fig. 4) In particular, the second electrode 22 is arranged on the second end surface 202 of the element body 20.

[0031] The second electrode 22 is formed by spraying a metal onto the second end face 202 of the element body 20. This electrically connects the second electrode 22 to the second internal electrode. The metal forming the second electrode 22 is similar to the metal forming the first electrode 21. <Erste Sammelschiene>

[0032] The first busbar 31 is a conductive element. The material of the first busbar 31 is not specifically restricted and examples include copper (Cu), aluminum (Al) and alloys thereof.

[0033] As in Fig. As shown in Figure 3, the first busbar 31 comprises first internal connections 41, a first external connection 51, and a first connecting part 61. The first internal connections 41, the first external connection 51, and the first connecting part 61 are integrated. The first busbar 31 is formed, for example, by suitable punching and bending of a metal plate. <<Erster interner Anschluss> >

[0034] The first internal connections 41 correspond one-to-one to the capacitor elements 2. That is, in the first busbar 31, the number of first internal connections 41 equals the number of capacitor elements 2. The first internal connections 41 protrude forward from the first connecting part 61. The first internal connections 41 are, for example, soldered to the first electrodes 21 (see Fig. 5). <<Erster externer Anschluss> >

[0035] The first external connection 51 is configured to be connected to an external device (not shown). The external device is not specifically restricted and includes, for example, components that form an inverter device. That is, capacitor 1, for example, can be part of the inverter device.

[0036] The first external connection 51 is located in a position closest to the fourth capacitor element 2d (see Fig. 4 and Fig. 5) Furthermore, the first external connection 51 is located at a position furthest away from the first capacitor element 2a.

[0037] The first external connector 51 has an essentially L-shape in side view. That is, the first external connector 51 projects upwards and then backwards from the first connecting part 61. <<Erstes Verbindungsteil> >

[0038] As in Fig. As shown in Figure 3, the first connecting part 61 connects the first internal terminals 41 to the first external terminal 51. The first connecting part 61 extends in a direction (left-right direction) in which the plurality of capacitor elements 2 are aligned.

[0039] In the present embodiment, the first connecting part 61 has essentially an L-shape in side view. In particular, the first connecting part 61 comprises a side plate 601 and a base plate 611.

[0040] The side plate 601 is positioned on one side (in the present embodiment, on the rear side) of the plurality of capacitor elements 2. The side plate 601 has a thickness in the forward-backward direction, a width in the upward-downward direction, and a flat plate shape extending in the left-right direction. The width of the side plate 601 is essentially equal to the height (length in the upward-downward direction) of the capacitor element 2. The length (left-right direction) of the side plate 601 is essentially equal to the product of the width (left-right direction) of the capacitor element 2 and the number (four in the present embodiment) of the capacitor elements 2.

[0041] The first external connector 51 protrudes upwards from an upper end of the side plate 601 in a right-hand position with respect to a center in the left-right direction.

[0042] The base plate 611 is positioned below the plurality of capacitor elements 2. The base plate 611 has a thickness in the upward-downward direction, a width in the forward-backward direction, and a flat plate shape extending in the left-right direction. The width of the base plate 611 is essentially equal to half the length (length in the forward-backward direction) of the capacitor element 2 (see Fig. 5) One length (left-right direction) of the base plate 611 is equal to the length (left-right direction) of the side plate 601.

[0043] The base plate 611 projects forward from a lower end of the side plate 601. The multitude of first internal connectors 41 projects forward from a front end of the base plate 611. <Zweite Sammelschiene>

[0044] The second busbar 32 is also a conductive element, similar to the first busbar 31. The material of the second busbar 32 is similar to the material of the first busbar 31.

[0045] The second busbar 32 does not come into direct contact with the first busbar 31. As in Fig. As shown in Figure 3, the second busbar 32 comprises a second internal connection 42, a second external connection 52, and a second connecting part 62. The second internal connections 42, the second external connection 52, and the second connecting part 62 are integrated. The second busbar 32 can also be formed, for example, by suitable punching and bending of a metal plate. <<Zweiter interner Anschluss> >

[0046] The second internal connections 42 correspond one-to-one to the capacitor elements 2. That is, in the second busbar 32, the number of second internal connections 42 equals the number of capacitor elements 2. The second internal connections 42 protrude forward from the second connecting part 62. The second internal connections 42 are connected to the second electrodes 22, for example, by soldering (see Fig. 2 and Fig. 4). <<Zweiter externer Anschluss > >

[0047] The second external port 52 is configured to connect to an external device (not shown). Specific examples of external devices are described above.

[0048] The second external port 52 is located on the left side of the first external port 51 (see Fig. 4 and Fig. 5) The second external connector 52 has essentially an L-shape in side view. That is, the second external connector 52 projects upwards and then backwards from the second connecting part 62. <<Zweites Verbindungsteil> >

[0049] As in Fig. As shown in Figure 3, the second connecting part 62 connects the second internal terminals 42 to the second external terminal 52. The second connecting part 62 extends in the direction (left-right direction) in which the plurality of capacitor elements 2 are oriented.

[0050] In the present embodiment, the second connecting part 62 comprises a side plate 602. The side plate 602 is positioned on one side (in the present embodiment, a rear side) of the plurality of capacitor elements 2. The side plate 602 has a thickness in the forward-backward direction, a width in the upward-downward direction, and a flat plate shape extending in the left-right direction. The width (upward-downward direction) and length (left-right direction) of the side plate 602 of the second connecting part 62 are essentially equal to the width (upward-downward direction) and length (left-right direction) of the side plate 601 of the first connecting part 61.

[0051] The multiple second internal connectors 42 project forward from an upper end of the side plate 602. The second external connector 52 projects upward from an upper end of the side plate 602 at a position to the right of center in a left-right direction.

[0052] The side plate 602 is arranged in a forward-backward direction between the plurality of capacitor elements 2 and the side plate 601 of the first connecting part 61. However, the side plate 602 of the second connecting part 62 does not come into direct contact with the side plate 601 of the first connecting part 61.

[0053] The second connecting part 62 has a plurality (four in the present embodiment) of through holes 60. In particular, the plurality of through holes 60 penetrate the side plate 602 in a forward-backward direction. The through holes 60 correspond one-to-one to the capacitor elements 2. That is, in the second connecting part 62, the number of through holes 60 is equal to the number of capacitor elements 2. In a case where four through holes 60 are distinguished from one another, these through holes 60 can be designated as first through hole 60a, second through hole 60b, third through hole 60c, and fourth through hole 60d in the order from left to right. <isolierelement>

[0054] The insulating element is an element with electrical insulating properties. The material of the insulating element 7 is not specifically restricted, and examples include polyphenylene sulfide (PPS).

[0055] The insulating element 7 is arranged between the side plate 601 of the first connecting part 61 and the second connecting part 62. In particular, the insulating element 7 is arranged between the side plate 601 of the first connecting part 61 and the side plate 602 of the second connecting part 62 in a forward-backward direction.

[0056] The insulating element 7 comprises a main body 700 and a plurality (four in the present embodiment) of positioning parts 70. The main body 700 and the plurality of positioning parts 70 are integrated.

[0057] The main body 700 has a thickness in the forward-backward direction, a width in the upward-downward direction, and a flat plate shape extending in the left-right direction. The width (upward-downward direction) and length (left-right direction) of the main body 700 are essentially equal to the width (upward-downward direction) and length (left-right direction) of the side plate 601. The side plate 601 of the first connecting part 61 faces the numerous capacitor elements 2, with the main body 700 of the insulating element 7 and the side plate 602 of the second connecting part 62 positioned between them.

[0058] The positioning elements 70 project forward from a front face of the main body 700. The positioning elements 70 project through through holes 60 and abut capacitor elements 2 (see Fig. 4) As described above, the capacitor elements 2 abut distal ends of the positioning parts 70, thereby positioning the capacitor elements 2 in a forward-backward direction.

[0059] The positioning elements 70 correspond one-to-one to the through-holes 60 of the second busbar 32 and one-to-one to the capacitor elements 2. That is, in the insulating element 7, the number of positioning elements 70 is equal to the number of capacitor elements 2.

[0060] In a case where four positioning parts 70 are distinguished, these positioning parts 70 can be designated as the first positioning part 70a, second positioning part 70b, third positioning part 70c, and fourth positioning part 70d in order from left to right. The first positioning part 70a, the second positioning part 70b, the third positioning part 70c, and the fourth positioning part 70d correspond to the first through-hole 60a, the second through-hole 60b, the third through-hole 60c, and the fourth through-hole 60d, respectively. The first positioning part 70a, the second positioning part 70b, the third positioning part 70c, and the fourth positioning part 70d correspond to the first capacitor element 2a, the second capacitor element 2b, the third capacitor element 2c, and the fourth capacitor element 2d, respectively.

[0061] In the present embodiment, when four positioning parts 70 are aligned in sequence from one positioning part with a shorter projection length (forward-backward direction), a first positioning part 70a, a second positioning part 70b, a third positioning part 70c and a fourth positioning part 70d are aligned in this sequence (see Fig. 4 and Fig. 5) It should be noted that the lead lengths of the third positioning part 70c and the fourth positioning part 70d may be the same. < Positional relationship between a multitude of capacitor elements >

[0062] Next, the positional relationship between the multitude of capacitor elements 2 is described.

[0063] The multitude of capacitor elements 2 are aligned in the left-right direction, but offset in the forward-backward direction (see Fig. 4 and Fig. 5) It should be noted that the multitude of capacitor elements 2 are not offset in the upward-downward direction.

[0064] In particular, the capacitor element 2 that is located furthest from the first external terminal 51 among the multiple capacitor elements 2 in the forward-backward direction is located in the position closest to the side plate 601 of the first connecting part 61. When the capacitor element 2 is located in the position furthest from the first external terminal 51 in the left-right direction, the current path from the capacitor element 2 to the first external terminal 51 is longest. When the capacitor element 2 is located in the position closest to the side plate 601 of the first connecting part 61, the distance (a distance along the forward-backward direction) from the side plate 601 to the capacitor element 2 is shortest.It should be noted that the distance from the side plate 601 to the capacitor element 2 can be adjusted by the projection length (a length in the forward-backward direction) of the positioning part 70 of the insulating element 7.

[0065] That is, in the present embodiment, the first capacitor element 2a, which is located furthest from the first external terminal 51 among the four capacitor elements 2 in the left-right direction, is located in the forward-backward direction at the position that is closest to the side plate 601 of the first connecting part 61.

[0066] Furthermore, the capacitor element 2, which is arranged in the left-right direction among the multiple capacitor elements 2 at a position closest to the first external terminal 51, is arranged in the forward-backward direction at a position furthest from the side plate 601 of the first connecting part 61. When the capacitor element 2 is arranged at the position closest to the first external terminal 51, the current path from the capacitor element 2 to the first external terminal 51 is shortest. When the capacitor element 2 is arranged at the position furthest from the side plate 601 of the first connecting part 61, the distance (the distance along the forward-backward direction) from the side plate 601 to the capacitor element 2 is longest.

[0067] That is, in the present embodiment, the fourth capacitor element 2d, which is arranged among the four capacitor elements 2 in the left-right direction at the position closest to the first external terminal 51, is arranged at the position furthest away from the side plate 601 of the first connecting part 61 in the forward-backward direction (see Fig. 4 and Fig. 5).

[0068] Preferably, as the distance between a capacitor element among the plurality of capacitor elements 2 and the first external terminal 51 decreases in the left-right direction, the distance between that capacitor element and the side plate 601 of the first connecting part 61 increases in the forward-backward direction. That is, in the present embodiment, the distance (current path) from the first external terminal 51 in the forward-backward direction decreases for the first capacitor element 2a, the second capacitor element 2b, the third capacitor element 2c, and the fourth capacitor element 2d in that order. Preferably, the first capacitor element 2a, the second capacitor element 2b, the third capacitor element 2c, and the fourth capacitor element 2d are arranged such that they have larger distances (the distances along the forward-backward direction) from the side plate 601 of the first connecting part 61 in that order.It should be noted that the distance between the third capacitor element 2c and the side plate 601 of the first connecting part 61 can be equal to the distance between the fourth capacitor element 2d and the side plate 601 of the first connecting part 61.

[0069] Furthermore, in the present embodiment, the plurality of capacitor elements 2 are aligned in the first direction (left-right direction) with their mutually facing flat surfaces 23 and 24 (see Fig. 4 and Fig. 5) That is, between two capacitor elements 2 adjacent in the left-right direction, the flat surface 23 of one capacitor element 2 and the flat surface 24 of the other capacitor element 2 are opposite each other. <Gehäuse>

[0070] As in Fig. As shown in Figure 1, the housing 8 contains the multitude of capacitor elements 2. In the present embodiment, the housing 8 is open at the top.

[0071] The housing 8 exhibits electrical insulating properties. The material of the housing 8 is not specifically restricted, and examples include polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and an epoxy resin (EP). <dichtungsabschnitt>

[0072] As in Fig. As shown in Figure 1, the housing 8 is filled with a sealing section 9. Specifically, the sealing section 9 is filled into a gap between an inner surface of the housing 8 and the capacitor element 2. Furthermore, the plurality of capacitor elements 2, the first busbar 31, the second busbar 32, and the insulating element 7 are embedded in the sealing section 9, with the exception of the first external terminal 51 of the first busbar 31, the second external terminal 52 of the second busbar 32, and a portion of the insulating element 7. As described above, the sealing section 9 seals the plurality of capacitor elements 2. The first external terminal 51 of the first busbar 31 and the second external terminal 52 of the second busbar 32 extend outwards from the sealing section 9.

[0073] Sealing section 9 is a cured product made from a resin with electrical insulating properties. The resin includes, for example, a thermosetting resin, a photocuring resin, and the like. The resin is not specifically restricted, and examples include an epoxy (EP) resin. <auswirkungen>

[0074] In the first embodiment, the fluctuations in heat generation of the plurality of capacitor elements 2 can be reduced. The reason for this is considered below.

[0075] In the present embodiment, the capacitor element 2 (first capacitor element 2a), which is located furthest from the first external terminal 51 among the several capacitor elements 2 in the left-right direction, is located in the forward-backward direction at the point closest to the side plate 601 of the first connecting part 61 (see Fig. 4 and Fig. 5).

[0076] As described above, the first capacitor element 2a is located at the position furthest from the first external terminal 51, so that the inductance generated by the current path from the first external terminal 51 to the first capacitor element 2a increases. As described above, the inductance increases with increasing current path length.

[0077] In the present embodiment, the first capacitor element 2a is arranged in the position closest to the side plate 601 of the first connecting part 61. Thus, the magnetic flux generated by a current flowing through the first capacitor element 2a and the magnetic flux generated by a current flowing through the side plate 601 of the first connecting part 61 cancel each other out. This mutual cancellation of magnetic fluxes results in a reduction of inductance. Therefore, the inductances of all current paths of the four capacitor elements 2 can be easily matched.

[0078] This allows the resonant frequency, derived from the electrostatic capacitance of capacitor element 2 and the inductance of the current path for capacitor element 2, to be adjusted across the multitude of capacitor elements 2. Since this results in virtually no impedance or phase difference across the entire frequency range, it is possible to suppress fluctuations in the current flowing through each capacitor element 2.

[0079] Accordingly, according to the present embodiment, the fluctuations in heat generation of the plurality of capacitor elements 2 can be reduced.

[0080] Furthermore, in the present embodiment, the capacitor element 2 (fourth capacitor element 2d), which is arranged among the multiple capacitor elements 2 in the left-right direction at the position closest to the first external terminal 51, is arranged in the position furthest away from the side plate 601 of the first connecting part 61 in the forward-backward direction. This further reduces the fluctuations in heat generation of the plurality of capacitor elements 2.

[0081] Furthermore, it is advantageous if the distance between one of the multiple capacitor elements 2 and the first external terminal 51 becomes shorter in the left-right direction, while the distance between one of the capacitor elements 2 and the side plate 601 of the first connecting part 61 becomes longer in the forward-backward direction. This allows the degree of magnetic flux cancellation to be varied according to the magnitude of the inductance generated by the current path. Thus, the inductances from the first external terminal 51 to the capacitor elements 2 can be adjusted, and the fluctuations in heat generation of the multiple capacitor elements 2 can be further reduced.

[0082] Since, in the present embodiment, the plurality of capacitor elements 2 are oriented in the first direction (left-right direction) such that the flat surface 23 of one capacitor element 2 and the flat surface 24 of another capacitor element 2 face each other, the plurality of capacitor elements 2 fit together well. That is, there is hardly any dead space between two adjacent capacitor elements 2.

[0083] Furthermore, in the present embodiment, the insulating element 7 is arranged between the side plate 601 of the first connecting part 61 and the second connecting part 62. In particular, the insulating element 7 is arranged between the side plate 601 and the side plate 602. This allows, for example, the side plate 601 and the side plate 602 to be brought closer together if the thickness or other properties of the insulating element 7 are adjusted as required. Accordingly, the inductance can be reduced.

[0084] As in Fig. As shown in Figure 1, the moisture resistance can be improved if the capacitor 1 further comprises a housing 8 and a sealing section 9. That is, the sealing section 9 can suppress the ingress of moisture into the capacitor element 2. (2) Second embodiment

[0085] Next, capacitor 1 is installed according to a second embodiment with reference to the Fig. Sections 6 to 9 are described. In the second embodiment, the same configuration elements as in the first embodiment are designated with the same reference numerals as in the first embodiment, and a detailed description of them can be omitted.

[0086] The second embodiment differs from the first embodiment in that the first external connection 51 of the first busbar 31 and the second external connection 52 of the second busbar 32 are arranged essentially in the middle in the left-right direction. < Positional relationship between a multitude of capacitor elements >

[0087] In the present embodiment, the capacitor element 2, which is arranged among the several capacitor elements 2 in the left-right direction at the position closest to the first external terminal 51, is also arranged in the forward-backward direction at the position furthest from the side plate 601 of the first connecting part 61. That is, in the present embodiment, the third capacitor element 2c, which is arranged among the four capacitor elements 2 in the left-right direction at the position closest to the first external terminal 51, is arranged in the position furthest from the side plate 601 of the first connecting part 61 in the forward-backward direction (see Fig. 8 and Fig. 9). That is, among the four positioning parts 70, the lead length of the third positioning part 70c is the longest.

[0088] It should be noted that, similar to the third capacitor element 2c, the second capacitor element 2b can also be positioned to the left of the third capacitor element 2c at the position furthest from the side plate 601 of the first connecting part 61 in the forward-backward direction. That is, the projection length of the second positioning part 70b can be equal to the projection length of the third positioning part 70c.

[0089] Furthermore, the capacitor element 2 that is furthest from the first external terminal 51 among the plurality of capacitor elements 2 in the left-right direction is arranged in the forward-backward direction at the position closest to the side plate 601 of the first connecting part 61. That is, in the present embodiment, the first capacitor element 2a that is furthest from the first external terminal 51 among the four capacitor elements 2 in the left-right direction is arranged in the forward-backward direction at the position closest to the side plate 601 of the first connecting part 61. That is, among the four positioning parts 70, the projection length of the first positioning part 70a is the shortest.

[0090] It should be noted that, similar to the first capacitor element 2a, the fourth capacitor element 2d can also be positioned at its right end in the position closest to the side plate 601 of the first connecting part 61 in the forward-backward direction. That is, the projection length of the fourth positioning part 70d can be equal to the projection length of the first positioning part 70a. <auswirkungen>

[0091] The second embodiment has the same effect as the first embodiment. Accordingly, the position of the first external terminal 51 of the first busbar 31 in the left-right direction of the capacitor 1 is not limited. That is, the distance from the side plate 601 can be determined for each of the plurality of capacitor elements 2 according to the position of the first external terminal 51 in the left-right direction (the length of the current path with the first external terminal 51). (3) Third embodiment

[0092] Next, capacitor 1 is installed according to a third embodiment with reference to the Fig. Described in sections 10 to 13. In the third embodiment, the same configuration elements as in the first and second embodiments are designated with the same reference numerals as in the first and second embodiments, and a detailed description thereof can be omitted.

[0093] The third embodiment differs from the second embodiment in that the second connecting part 62 of the second busbar 32 does not include a side plate 602. <<Zweites Verbindungsteil> >

[0094] The second connecting part 62 has essentially an L-shape in side view and extends in the direction (left-right direction) in which the plurality of capacitor elements 2 are oriented. However, the second connecting part 62 of the present embodiment does not include the side plate 602 of the first and second embodiments. Thus, the second connecting part 62 of the present embodiment does not have the through holes 60 of the first and second embodiments.

[0095] The second connecting part 62 of the present embodiment is located above the plurality of capacitor elements 2 and not behind the plurality of capacitor elements 2. Consequently, the side plate 601 of the first connecting part 61 faces the plurality of capacitor elements 2, with the main body 700 of the insulating element 7 arranged between them. <auswirkungen>

[0096] The third embodiment has the same effect as the first embodiment. As described above, the fluctuations in heat generation of the plurality of capacitor elements 2 can be reduced, even though the second connecting part 62 of the second busbar 32 does not include a side plate 602. 3. Modifications

[0097] In the first to third embodiments, the capacitor 1 comprises four capacitor elements 2, but the number of capacitor elements 2 is not specifically limited as long as the capacitor comprises two or more capacitor elements 2.

[0098] Similar to the capacitor 1 according to the first embodiment, the capacitor 1 according to the second and third embodiments can further comprise a housing 8 and a sealing section 9. 4. Aspects

[0099] As can be seen from the above embodiments and modifications, the present disclosure comprises the following aspects. In the following description, reference numerals are only given in parentheses to clarify the relationship to the embodiments.

[0100] A first aspect is a capacitor (1) comprising a plurality of capacitor elements (2) aligned in a first direction, a first busbar (31), and a second busbar (32). Each of the plurality of capacitor elements (2) comprises an element body (20), a first electrode (21) located at one end of the element body (20), and a second electrode (22) located at the other end of the element body (20). The first busbar (31) comprises a first internal terminal (41) connected to the first electrode (21), a first external terminal (51) to be connected to an external device, and a first connecting part (61) connecting the first internal terminal (41) to the first external terminal (51), the first connecting part (61) extending in the first direction.The first connecting part (61) comprises a side plate (601) positioned on one side of the plurality of capacitor elements (2) orthogonal to the first direction in a second direction. The second busbar (32) comprises a second internal terminal (42) connected to the second electrode (22), a second external terminal (52) to be connected to the external device, and a second connecting part (62) connecting the second internal terminal (42) to the second external terminal (52). The capacitor element (2) located furthest from the first external terminal (51) among the plurality of capacitor elements (2; 2a) in the first direction is located closest to the side plate (601) of the first connecting part (61) among the plurality of capacitor elements (2; 2a) in the second direction.

[0101] According to this aspect, the fluctuations in heat generation of the multitude of capacitor elements (2) can be reduced.

[0102] A second aspect is a capacitor (1) based on the first aspect. In the second aspect, the capacitor element (2; 2d) is arranged in a position that is closest to the first external terminal (51) in the first direction among the multiple capacitor elements (2) and in a position that is furthest from the side plate (601) of the first connecting part (61) in the second direction among the multiple capacitor elements (2).

[0103] According to this aspect, the fluctuations in heat generation of the multitude of capacitor elements (2) can be further reduced.

[0104] A third aspect is a capacitor (1) based on the first or second aspect. In the third aspect, if the distance between a first external terminal (51) and a capacitor element among the plurality of capacitor elements (2) becomes shorter in the first direction, the distance between a capacitor element (2) and a side plate (601) of a first connecting part (61) becomes longer in the second direction.

[0105] According to this aspect, the fluctuations in heat generation of the multitude of capacitor elements (2) can be further reduced.

[0106] A fourth aspect is a capacitor (1) based on one of the first to third aspects. In the fourth aspect, the element body (20) comprises two planar surfaces (23 and 24) that are parallel to each other. Two capacitor elements adjacent in the first direction from the plurality of capacitor elements (2) are arranged such that one of the two planar surfaces (23 and 24) in one of the two capacitor elements faces a corresponding planar surface in the other of the two capacitor elements in the first direction.

[0107] According to this aspect, the multitude of capacitor elements (2) fit together well.

[0108] A fifth aspect is a capacitor (1) based on one of the first to fourth aspects. In the fifth aspect, the capacitor (1) further comprises an insulating element (7) arranged between the second connecting part (62) and the side plate (601) of the first connecting part (61).

[0109] According to this aspect, the inductance can be reduced.

[0110] A sixth aspect is a capacitor (1) based on one of the first to fifth aspects. In the sixth aspect, the capacitor (1) further comprises a housing (8) that accommodates the plurality of capacitor elements (2) and a sealing section (9) that seals the plurality of capacitor elements (2).

[0111] According to this aspect, moisture resistance can be improved. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2018-007325

[0003] < / auswirkungen> < / auswirkungen> < / auswirkungen> < / dichtungsabschnitt> < / isolierelement> < / kondensatorelement>

Claims

[1] Capacitor, comprehensive: a large number of capacitor elements aligned in a first direction; a first busbar; and a second busbar where: Each of the multiple capacitor elements comprises an element body, a first electrode located at one end of the element body, and a second electrode located at the other end of the element body. the first busbar comprises a first internal terminal connected to the first electrode, a first external terminal to be connected to an external device, and a first connecting part connecting the first internal terminal to the first external terminal, the first connecting part extending in the first direction, the first connecting part includes a side plate which is positioned on one side of the multitude of capacitor elements in a second direction orthogonal to the first direction, the second busbar comprises a second internal terminal connected to the second electrode, a second external terminal to be connected to the external device, and a second connecting part connecting the second internal terminal to the second external terminal, and a capacitor element that is located in a position that is furthest away from the first external terminal in the first direction among the multitude of capacitor elements, and in a position that is closest to the side plate of the first connecting part in the second direction among the multitude of capacitor elements. [2] Capacitor according to claim 1, wherein a capacitor element located at a position which is closest to the first external terminal in the first direction among the plurality of capacitor elements is located at a position which is furthest from the side plate of the first connecting part in the second direction among the plurality of capacitor elements. [3] Capacitor according to claim 2, wherein if a distance between the first external terminal and a capacitor element among the plurality of capacitor elements is shortened in the first direction, a distance between the one capacitor element and the side plate of the first connecting part is lengthened in the second direction. [4] Capacitor according to claim 1, wherein: the element body has two parallel planar surfaces, and Two capacitor elements, which are adjacent in the first direction among the plurality of capacitor elements, are arranged such that one of the two flat surfaces in one of the two capacitor elements faces a corresponding one of the two flat surfaces in another of the two capacitor elements in the first direction. [5] Capacitor according to claim 1, further comprising an insulating element arranged between the second connecting part and the side plate of the first connecting part. [6] Capacitor according to claim 1, further comprising a housing that accommodates the plurality of capacitor elements and a sealing section that seals the plurality of capacitor elements.

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