Capacitor device

Abstract

To provide a capacitor device that can achieve both of suppression of heat concentration between electrode connection parts and miniaturization.SOLUTION: A capacitor device comprises: a plurality of capacitor elements 40; a plurality of first electrode terminals 50; and a plurality of second electrode terminals 60. Each capacitor element includes a first end surface 40A and a second end surface 40B separated from each other in a width direction. Each first electrode terminal includes a first electrode connection part that is connected to a first electrode 41 of a first end surface. Each second electrode terminal includes a second electrode connection part that is connected to a second electrode 42 of a second end surface. The plurality of capacitor elements are arranged along the width direction so that their first end surfaces face one another and / or their second end surfaces face one another in the width direction. The first electrode connection parts respectively connected to the first electrodes that face each other in the width direction and / or the second electrode connection parts respectively connected to the second electrodes that face each other in the width direction are offset with respect to at least one of directions orthogonal to the width direction.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The disclosure described in this specification relates to a capacitor device.

Background Art

[0002] The case-molded capacitor described in Patent Document 1 includes a first block, a first P-pole bus bar, a first N-pole bus bar, a second block, a second P-pole bus bar, and a second N-pole bus bar. The first block and the second block are each composed of a plurality of metallized film capacitors having a P-pole and an N-pole. The N-poles of the capacitors in the first block face the N-poles of the capacitors in the second block.

[0003] The first P-pole bus bar is connected to the P-poles of the capacitors in the first block and has a first P-pole terminal portion for external connection at one end. The first N-pole bus bar is connected to the N-poles of the capacitors in the first block and has a first N-pole terminal portion 24A for external connection at one end. The second P-pole bus bar is connected to the P-poles of the capacitors in the second block and has a second P-pole terminal portion for external connection at one end. The second N-pole bus bar is connected to the N-poles of the capacitors in the second block and has a second N-pole terminal portion for external connection at one end.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the configuration of Patent Document 1, with respect to the direction in which the first block and the second block are arranged side by side, the first N - pole terminal portion and the second N - pole terminal portion overlap. Therefore, heat concentration occurs between the first N - pole terminal portion and the second N - pole terminal portion. Also, with respect to the direction in which the first block and the second block are arranged side by side, it is necessary to separate the first block and the second block by at least the thickness of the first N - pole terminal portion and the second N - pole terminal portion. As a result, the case - molded capacitor becomes larger in size. In the configuration of Patent Document 1, it has been difficult to achieve both suppression of heat concentration between the first N - pole terminal portion and the second N - pole terminal portion and miniaturization of the case - molded capacitor.

[0006] An object of the present disclosure is to provide a capacitor device capable of achieving both suppression of heat concentration between electrode connection portions and miniaturization.

Means for Solving the Problems

[0007] A capacitor device according to one aspect of the present disclosure includes: a plurality of capacitor elements (40) each having a first end face (40A) and a second end face (40B) separated in the width direction (X); a plurality of first electrode terminals (50) provided individually for each capacitor element, having a first electrode connection portion (51, 52) connected to the first electrode formed on the first end face; a plurality of second electrode terminals (60) provided individually for each capacitor element, having a second electrode connection portion (61, 62) connected to the second electrode formed on the second end face, and the plurality of capacitor elements are arranged along the width direction such that the first end faces face each other and / or the second end faces face each other in the width direction, the first electrode connection portions each connected to the first electrodes facing each other in the width direction, and / or the second electrode connection portions each connected to the second electrodes facing each other in the width direction, are arranged offset with respect to at least one of the height direction (Z), which is one of the directions orthogonal to the width direction, and the depth direction (Y), which is orthogonal to both the width direction and the height direction.

[0008] According to this, the first electrode connection parts (51, 52) provided on the electrodes facing each other in the width direction (X), and / or the second electrode connection parts (61, 62) are suppressed from overlapping in the width direction. Therefore, heat concentration is suppressed from occurring between the first electrode connection parts and / or between the second electrode connection parts. Also, the distance between adjacent capacitor elements (40) in the width direction can be reduced. Accordingly, the capacitor device can be miniaturized. Suppression of heat concentration between the electrode connection parts and miniaturization of the capacitor device can be achieved simultaneously.

[0009] Note that the reference numerals in the parentheses above only indicate the correspondence with the configurations described in the embodiments below, and do not limit the technical scope in any way.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Modes for Carrying Out the Invention

[0011] Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each mode, the same reference numerals may be given to the parts corresponding to those described in the preceding mode, and the overlapping description may be omitted. When only a part of the configuration is described in each mode, other modes described previously can be applied to other parts of the configuration.

[0012] In addition, not only the combinations of the parts clearly shown to be combinable in each embodiment, but also the embodiments, the embodiments and the modification examples, and the modification examples can be partially combined with each other as long as there is no problem in the combination, even if not clearly shown.

[0013] (First Embodiment) <In-Vehicle System> FIG. 1 is an electrical circuit diagram of a power conversion device 10 mounted on an in-vehicle system 1. A battery 2, a motor generator 4, and a power conversion device 10 are mounted on the in-vehicle system 1. The vehicle on which the in-vehicle system 1 is mounted is a hybrid vehicle capable of switching and / or combining the driving force of the engine and the driving force of the motor generator 4. The engine and the motor generator 4 are interconnected via a gear device.

[0014] The power conversion device 10 includes an inverter 11, a control circuit board 15, a capacitor 20, a high-potential side bus bar 110, a low-potential side bus bar 120, and a connection bus bar 130. The high-potential side bus bar 110 is a conductive member connected to the positive electrode of the battery 2. The low-potential side bus bar 120 is a conductive member connected to the negative electrode of the battery 2. The connection bus bar 130 is a conductive member that connects the inverter 11 and the motor generator 4. Note that the inverter 11 may be referred to as an external device.

[0015] The inverter 11 is connected to the high-potential side bus bar 110 and the low-potential side bus bar 120. The inverter 11 has a plurality of switch modules 12. Each switch module 12 has two switching elements 13 and two diodes 13A. The two switching elements 13 are connected in series between the high-potential side bus bar 110 and the low-potential side bus bar 120.

[0016] A high-potential side input terminal 11A connected to the high-potential side bus bar 110 is connected to one collector electrode provided on the high-potential side among the two switching elements 13. A low-potential side input terminal 11B connected to the low-potential side bus bar 120 is connected to one emitter provided on the low-potential side among the two switching elements 13. The anode of the diode 13A is connected to the emitter of the corresponding switching element 13. The cathode of the diode 13A is connected to the collector of the corresponding switching element 13.

[0017] A motor terminal 11C connected to the motor generator 4 is connected to the emitter of the high-potential side switching element 13 and the collector of the low-potential side switching element 13. The plurality of switching elements 13 convert the DC power supplied from the battery 2 into AC power that can drive the motor generator 4. The power after power conversion is supplied to the motor generator 4 via the motor terminal 11C and the connection bus bar 130.

[0018] The control circuit board 15 controls the on / off of a plurality of switching elements 13. A control circuit for controlling the on / off of a plurality of switching elements 13 is mounted on the control circuit board 15. The connection terminals 11D of the plurality of switching elements 13 are soldered to the control circuit board 15. The connection terminals 11D of the plurality of switching elements 13 are electrically connected to the control circuit board 15.

[0019] The capacitor 20 is electrically connected to the inverter 11 and the battery 2 via the high-potential side bus bar 110 and the low-potential side bus bar 120. The capacitor 20, the high-potential side bus bar 110, and the low-potential side bus bar 120 may be collectively referred to as the capacitor device 100. The capacitor device 100 further includes an insulating member 140, a capacitor case 150, and a sealing resin 160.

[0020] The insulating member 140 is provided between the high-potential side bus bar 110 and the low-potential side bus bar 120. The insulating member 140 maintains the insulation between the high-potential side bus bar 110 and the low-potential side bus bar 120. The high-potential side bus bar 110, the low-potential side bus bar 120, and the insulating member 140 may be collectively referred to as the bus bar module 180. As an example, the bus bar module 180 is inserted into the capacitor case 150. The capacitor case 150 is mainly formed of resin. The bus bar module 180 is integrally formed with the capacitor case 150. Note that the capacitor case 150 may be formed of a laminate film such as a moisture-proof sheet instead of resin.

[0021] The capacitor case 150 is a housing that houses the capacitor 20 inside. The sealing resin 160 is a member that fills the storage space of the capacitor case 150. The capacitor 20 is fixed to the capacitor case 150 by the sealing resin 160.

[0022] The capacitor 20 has a plurality of capacitor components 30. As an example, the capacitor 20 has five capacitor components 30. Note that the number of capacitor components 30 is not limited to five. The capacitor component 30 has a capacitor element 40, a first electrode terminal 50, and a second electrode terminal 60. The five capacitor components 30 may be referred to as a first capacitor component 31, a second capacitor component 32, a third capacitor component 33, a fourth capacitor component 34, and a fifth capacitor component 35.

[0023] The five capacitor components 30 are connected in parallel to the inverter 11 and the battery 2 via a high-potential side bus bar 110 and a low-potential side bus bar 120. The capacitor element 40 has a first electrode 41 and a second electrode 42. The first electrode terminal 50 is connected to the first electrode 41 of each capacitor element 40. The second electrode terminal 60 is connected to the second electrode 42 of each capacitor element 40. The five capacitor elements 40 are electrically connected to the high-potential side bus bar 110 via the respective first electrode terminals 50. The five capacitor elements 40 are electrically connected to the low-potential side bus bar 120 via the respective second electrode terminals 60.

[0024] <Mechanical Configuration of Power Conversion Device and Capacitor Device> When explaining the mechanical configuration of the power conversion device 10 and the capacitor device 100, the drawings will be described first. FIG. 2 is a side view of the power conversion device 10. FIG. 3 is an exploded perspective view of the capacitor device 100. FIG. 4 is a perspective view of the capacitor device 100 with the encapsulating resin 160 removed from the capacitor device 100. FIG. 5 is a plan view of the capacitor 20 as viewed from the upper surface 40D. FIG. 6 is a partial perspective view of the capacitor 20 as viewed from the side of the first capacitor component 31. Note that in FIG. 6, the description of the second electrode terminal 60 of the first capacitor component 31 is omitted. FIG. 7 is a partial perspective view of the capacitor 20 as viewed from the side of the second capacitor component 32. Note that in FIG. 7, the description of the first electrode terminal 50 of the second capacitor component 32 is omitted.

[0025] FIG. 8 is a schematic diagram of the capacitor 20 for explaining the arrangement of the capacitor components 30 as viewed from the upper surface 40D. FIG. 9 is a partial perspective view of the capacitor 20 for explaining the arrangement of the adjacent electrode terminals 50 and 60. FIG. 10 is a partial perspective view of the capacitor 20 for explaining the connection form between the external connection portions 54 and 64 and the terminal connection portions 111 and 121. FIG. 11 is a side view of the capacitor 20. FIG. 12 is a perspective view of the capacitor case 150. FIG. 13 is a schematic diagram of the bus bar module 180.

[0026] The power conversion device 10 further includes a capacitor device 100 and a case 14 for housing the inverter 11. The case 14 is mainly made of a member with low thermal resistance such as aluminum. Note that the main material of the case 14 is not limited to aluminum. The case 14 may be made of resin. The capacitor device 100 and the inverter 11 are housed in the housing space of the case 14.

[0027] The capacitor 20 is housed in the housing space of the capacitor case 150. The five capacitor components 30 are housed in the housing space of the capacitor case 150. Hereinafter, the direction in which the five capacitor components 30 are arranged may be referred to as the X direction. The two directions orthogonal to the X direction may be referred to as the Y direction and the Z direction. The X direction, the Y direction, and the Z direction are three orthogonal directions. The capacitor element 40 has a three-dimensional shape with a certain volume. The capacitor element 40 is provided by a three-dimensional shape such as a cylinder, an elliptical cylinder, a cube, or a rectangular parallelepiped, for example. The capacitor element 40 has lengths in the X direction, the Y direction, and the Z direction. Note that the X direction may be referred to as the width direction of the capacitor element 40. The Y direction may be referred to as the depth direction of the capacitor element 40. The Z direction may be referred to as the height direction of the capacitor element 40.

[0028] The capacitor case 150 has a bottom 155 and side walls 170. The bottom 155 has a thin and flat shape in the Z direction. The side walls 170 extend annularly along the periphery of the bottom 155. The side walls 170 have a first wall 171 and a third wall 173 spaced apart in the Y direction. The side walls 170 further have a second wall 172 and a fourth wall 174 spaced apart in the X direction. The first wall 171 to the fourth wall 174 are integrally connected in counterclockwise order. A capacitor 20 is housed in the storage space defined by the bottom 155 and the side walls 170.

[0029] Five capacitor components 30 are arranged in order from the second wall 172 toward the fourth wall 174 as the first capacitor component 31, the second capacitor component 32, the third capacitor component 33, the fourth capacitor component 34, and the fifth capacitor component 35. The capacitor element 40 has a first end face 40A, a second end face 40B, and a side face 40C.

[0030] The two end faces 40A and 40B are provided spaced apart at the X-direction ends of the capacitor element 40. The side face 40C connects the first end face 40A and the second end face 40B. The side face 40C extends along the edges of the first end face 40A and the second end face 40B. It can also be said that the side face 40C extends along the edges of the first end face 40A and the second end face 40B in the circumferential direction around an axis along the X direction. The side face 40C has a lower surface 40E facing the bottom 155 of the capacitor case 150 and an upper surface 40D on the opposite side of the lower surface 40E. Hereinafter, the upper surface 40D side may be referred to as upward and the lower surface 40E side may be referred to as downward as appropriate.

[0031] A first electrode 41 is provided on the first end face 40A of the capacitor element 40. A second electrode 42 is provided on the second end face 40B of the capacitor element 40. The second end face 40B of the first capacitor component 31 is arranged to face the second wall 172 in the X direction. Among the five capacitor components 30 adjacent in the X direction, the first end faces 40A or the second end faces 40B face each other in the X direction.

[0032] As an example, the first end face 40A of the second capacitor component 32 is arranged to face the first end face 40A of the first capacitor component 31 in the X direction. The second end face 40B of the third capacitor component 33 is arranged to face the second end face 40B of the second capacitor component 32 in the X direction. The first end face 40A of the fourth capacitor component 34 is arranged to face the first end face 40A of the third capacitor component 33 in the X direction. The second end face 40B of the fifth capacitor component 35 is arranged to face the second end face 40B of the fourth capacitor component 34 in the X direction. The first end face 40A of the fifth capacitor component 35 is arranged to face the fourth wall 174 in the X direction.

[0033] As shown in FIG. 7, one end of the first electrode terminal 50 is joined to the first electrode 41. One end of the first electrode terminal 50 is joined to the first electrode 41 by soldering or the like. As shown in FIG. 10, the other end of the first electrode terminal 50 is joined to the high-potential side bus bar 110. The other end of the first electrode terminal 50 is joined to the high-potential side bus bar 110 by welding or the like.

[0034] The first electrode terminal 50 has two electrode connection portions 51, 52, an arm 53, an external connection portion 54, and a connection portion 55. Note that the electrode connection portions 51, 52 may be referred to as the first electrode connection portions. The arm 53 may be referred to as the first arm. The external connection portion 54 may be referred to as the first external connection portion. The connection portion 55 may be referred to as the first along-electric portion. The first electrode terminal 50 has two shape types. The shape type of the first electrode terminal 50 provided in the first capacitor component 31, the third capacitor component 33, and the fifth capacitor component 35 may be referred to as the first shape type 50F. The shape type of the first electrode terminal 50 provided in the second capacitor component 32 and the fourth capacitor component 34 may be referred to as the second shape type 50S. Hereinafter, elements with "F" attached to the reference signs are components of the first shape type 50F. Elements with "S" attached to the reference signs are components of the second shape type 50S.

[0035] First, the first shape type 50F of the first electrode terminal 50 will be described. The arm 53F in the first shape type 50F extends in the X direction from one end side to the other end side along the first end face 40A. Note that the side of the first wall 171 of the capacitor case 150 may be referred to as one end side. The side of the third wall 173 of the capacitor case 150 may be referred to as the other end side. A part of the arm 53F faces the first end face 40A in the X direction. The remainder of the arm 53F is provided above the upper surface 40D in the Z direction and does not face the first end face 40A in the X direction.

[0036] Two electrode connection parts 51F and 52F are provided at the lower end part of the arm 53F in the Z direction. The two electrode connection parts 51F and 52F are arranged side by side with a space therebetween in the Y direction. The two electrode connection parts 51F and 52F extend toward the lower surface 40E. The two electrode connection parts 51F and 52F are soldered to the first end face 40A of the corresponding capacitor components 31, 33, and 35.

[0037] A connecting part 55F is integrally connected to the upper end part of the arm 53F in the Z direction. The connecting part 55F is integrally connected to one end side of the arm 53F. The connecting part 55F extends in the XY direction along the upper surface 40D. As an example, the connecting part 55F is spaced apart from the upper surface 40D in the Z direction. Note that the connecting part 55F may not be spaced apart from the upper surface 40D in the Z direction. The connecting part 55F may be in contact with the upper surface 40D in the Z direction.

[0038] The connecting part 55F extends toward the second end face 40B of the corresponding capacitor components 31, 33, and 35. The external connection part 54F is integrally connected to one end of the connecting part 55F in the X direction. The external connection part 54F extends in the Z direction so as to be away from the connecting part 55F. By connecting the high-potential side bus bar 110 to the external connection part 54F, the inverter 11 and the capacitor component 30 are electrically connected.

[0039] Next, the second shape type 50S of the first electrode terminal 50 will be described. The arm 53S in the second shape type 50S is L-shaped in a plan view in the X direction. The arm 53S has a base portion 53SA extending in the Z direction and an extension portion 53SB extending in the Y direction. The base portion 53SA extends closer to the lower surface 40E than the arm 53F. The extension portion 53SB is integrally connected to the end portion on the lower surface 40E side of the base portion 53SA. The extension portion 53SB extends in the Y direction from one end side to the other end side along the first end surface 40A. Two electrode connection portions 51S, 52S are provided at the lower end portion in the Z direction of the arm 53F. The two electrode connection portions 51S, 52S extend toward the lower surface 40E. The two electrode connection portions 51S, 52S are solder-connected to the first end surface 40A of the corresponding capacitor components 32, 34.

[0040] A connecting portion 55S is integrally connected to the upper end portion in the Z direction of the base portion 53SA. The connecting portion 55S extends in the XY direction along the upper surface 40D. The connecting portion 55S is, as an example, spaced apart from the upper surface 40D in the Z direction. Note that the connecting portion 55S may not be spaced apart from the upper surface 40D in the Z direction. The connecting portion 55S may be in contact with the upper surface 40D in the Z direction. The connecting portion 55S extends toward the second end surface 40B of the corresponding capacitor components 32, 34. The external connection portion 54S is integrally connected to one end in the X direction of the connecting portion 55S. The external connection portion 54S extends in the Z direction so as to move away from the connecting portion 55S. By connecting the high-potential side bus bar 110 to the external connection portion 54S, the inverter 11 and the capacitor component 30 are electrically connected.

[0041] In this embodiment, the first end faces 40A of the capacitor components 30 adjacent in the X direction and the second end faces 40B face each other. Regarding the first electrode terminal 50, one arm 53F and the other arm 53S of two adjacent capacitor components 30 are in partial contact in the X direction. Note that the arm 53F and the arm 53S may not be in contact in the X direction. The first end face 40A provided with the arm 53S and the arm 53F are separated from each other in the X direction by the thickness of the arm 53S. Similarly, the first end face 40A provided with the arm 53F and the arm 53S are separated from each other in the X direction by the thickness of the arm 53F. According to this, it is possible for the liquid sealing resin 160 to pass through this gap during manufacturing.

[0042] Furthermore, in this embodiment, one electrode connection portions 51F, 52F and the other electrode connection portions 51S, 52S are displaced and arranged in both the Y direction and the Z direction. In other words, the four electrode connection portions 51F, 52F, 51S, 52S are arranged in a zigzag and stagger pattern in the Y direction and the Z direction. Note that the four electrode connection portions 51F, 52F, 51S, 52S may not be displaced and arranged in both the Y direction and the Z direction. For example, the X-direction positions of the electrode connection portions 51F, 52F and the electrode connection portions 51S, 52S may be the same, and only the Z-direction positions may be displaced. Also, the Z-direction positions of the electrode connection portions 51F, 52F and the electrode connection portions 51S, 52S may be the same, and only the X-direction positions may be displaced.

[0043] Also, the two connecting portions 55F, 55S are adjacent in the X direction. A magnetic field is generated around one connecting portion 55F according to the right-hand screw rule. A magnetic field is also generated around the other connecting portion 55S according to the right-hand screw rule. Therefore, the direction of the magnetic flux on the other side generated around one connecting portion 55F and the direction of the magnetic flux on the one side generated around the other connecting portion 55S are opposite. As a result, the magnetic field generated around the connecting portion 55F and the magnetic field generated around the connecting portion 55S cancel each other out.

[0044] The second electrode terminal 60 is connected to the second electrode 42 of the capacitor component 30. One end of the second electrode terminal 60 is joined to the second electrode 42 by soldering or the like. The other end of the second electrode terminal 60 is joined to the low-potential side bus bar 120 by welding or the like.

[0045] The second electrode terminal 60 has two electrode connection parts 61, 62, an arm 63, an external connection part 64, and a connecting part 65. Note that the electrode connection parts 61, 62 may be referred to as the second electrode connection parts. The arm 63 may be referred to as the second arm. The external connection part 64 may be referred to as the second external connection part. The connecting part 65 may be referred to as the second along-electrode part. The second electrode terminal 60 has two shape types. The shape type of the second electrode terminal 60 provided in the second capacitor component 32 and the fourth capacitor component 34 may be referred to as the first shape type 60F. The shape type of the second electrode terminal 60 provided in the first capacitor component 31, the third capacitor component 33, and the fifth capacitor component 35 may be referred to as the second shape type 60S.

[0046] The first shape type 60F has two electrode connection parts 61F, 62F, an arm 63F, an external connection part 64F, and a connecting part 65F. The second shape type 60S has two electrode connection parts 61S, 62S, an arm 63S, an external connection part 64S, and a connecting part 65S. Since the specific form of the first shape type 60F is the same as that of the first shape type 50F, a detailed description of the first shape type 60F is omitted. Since the specific form of the second shape type 60S is the same as that of the second shape type 50S, a detailed description of the second shape type 60S is omitted. The connecting part 65F extends toward the first end face 40A of the corresponding capacitor components 32, 34. The connecting part 65S extends toward the first end face 40A of the corresponding capacitor components 31, 33, 35.

[0047] Also, the arrangement of the arms 63F and 63S is the same as that of the arms 53F and 53S. Also, regarding the arrangement of the electrode connection parts 61F, 62F and the electrode connection parts 61S, 62S, it is the same as the arrangement of the electrode connection parts 51F, 52F and the electrode connection parts 51S, 52S. Furthermore, regarding the arrangement of the connecting parts 65F and 65S, it is the same as the arrangement of the connecting parts 55F and 55S.

[0048] The high-potential side bus bar 110 has a terminal connection part 111, an inverter connection part 112, a battery connection part 113, and a relay part 114. The terminal connection part 111 is a part connected to the external connection parts 54F, 54S. The inverter connection part 112 is a part connected to the high-potential side input terminal 11A of the inverter 11. The battery connection part 113 is a part connected to the positive electrode of the battery 2. In the high-potential side bus bar 110, the terminal connection part 111, the inverter connection part 112, and the battery connection part 113 are electrically connected via the relay part 114.

[0049] The low-potential side bus bar 120 has a terminal connection part 121, an inverter connection part 122, a battery connection part 123, and a relay part 124. The terminal connection part 121 is a part connected to the external connection parts 64F, 64S. The inverter connection part 122 is a part connected to the low-potential side input terminal 11B of the inverter 11. The battery connection part 123 is a part connected to the negative electrode of the battery 2. In the low-potential side bus bar 120, the terminal connection part 121, the inverter connection part 122, and the battery connection part 123 are electrically connected via the relay part 124.

[0050] As shown in FIG. 3, in a Z-direction plane view, the bus bars 110 and 120 are substantially Z-shaped. The relay parts 114 and 124 have a flat shape with a small thickness in the Z direction. The relay parts 114 and 124 have a first relay piece 114A, 124A extending in the X direction, a third relay piece 114C, 124C, and a second relay piece 114B, 124B extending in the Y direction. The first relay pieces 114A, 124A are connected to one end of the second relay pieces 114B, 124B, and the third relay pieces 114C, 124C are connected to the other end of the second relay pieces 114B, 124B.

[0051] Battery connection parts 113 and 123 are connected to the longitudinal ends of the first relay pieces 114A and 124A. Inverter connection parts 112 and 122 are connected to one end in the short direction of the third relay pieces 114C and 124C. Terminal connection parts 111 and 121 are connected to the other end in the short direction of the third relay pieces 114C and 124C. The terminal connection parts 111 and 121 extend upward in the Z direction so as to move away from the relay parts 114 and 124.

[0052] The high-potential side bus bar 110 has three terminal connection parts 111. One of the terminal connection parts 111 faces the two external connection parts 54 of the first capacitor component 31 and the second capacitor component 32 in the Y direction. One of the terminal connection parts 111 is welded to the two external connection parts 54. Another one of the terminal connection parts 111 faces the two external connection parts 54 of the third capacitor component 33 and the fourth capacitor component 34 in the Y direction. Another one of the terminal connection parts 111 is welded to the two external connection parts 54. Still another one of the terminal connection parts 111 faces one external connection part 54 of the fifth capacitor component 35 in the Y direction. Still another one of the terminal connection parts 111 is welded to one external connection part 54.

[0053] The low-potential side bus bar 120 has three terminal connection parts 121. One of the terminal connection parts 121 faces one external connection part 64 of the first capacitor component 31 in the Y direction. One of the terminal connection parts 121 is welded to one external connection part 64. Another one of the terminal connection parts 121 faces the two external connection parts 64 of the second capacitor component 32 and the third capacitor component 33 in the Y direction. Another one of the terminal connection parts 121 is welded to the two external connection parts 64. Still another one of the terminal connection parts 121 faces the two external connection parts 64 of the fourth capacitor component 34 and the fifth capacitor component 35 in the Y direction. Still another one of the terminal connection parts 121 is welded to the two external connection parts 64.

[0054] Next, a method for manufacturing the capacitor device 100 will be described. When manufacturing the capacitor device 100, the external connection portions 54 and 64 are faced with the corresponding terminal connection portions 111 and 121. Then, the external connection portions 54 and 64 and the terminal connection portions 111 and 121 are welded and joined. As an example of the type of welding, spot welding is employed. Spot welding is a welding method used for welding two thin plates. An apparatus that sandwiches the external connection portions 54 and 64 and the terminal connection portions 111 and 121, which are the base materials, is called a gun. An apparatus that supplies electricity to the gun is called a welding power source.

[0055] When performing welding, the external connection portions 54 and 64 and the terminal connection portions 111 and 121 are clamped by the gun. Electricity is supplied to the gun from the welding power source. Heat and pressure are applied to the welding portion between the external connection portions 54 and 64 and the terminal connection portions 111 and 121 by the gun. Due to this heat and pressure, the external connection portions 54 and 64 and the terminal connection portions 111 and 121 are joined.

[0056] In the present embodiment, five capacitor components 30 are arranged side by side along the X direction. The gun moves in the X direction while welding and joining the external connection portions 54 and 64 and the terminal connection portions 111 and 121 corresponding to each capacitor component 30. Also, in each capacitor component 30, the distance between the external connection portion 54 and the external connection portion 64 is constant in the X direction. The distance between the adjacent external connection portions 54 and 64 between adjacent capacitor components 30 is constant. Further, the positions of the upper surfaces 40D of the five capacitor components 30 coincide in the Z direction.

[0057] Note that the positions of the upper surfaces 40D of the five capacitor components 30 do not have to coincide in the Z direction. The gun moves in the X direction above the upper surface 40D while joining each external connection part 54, 64 and the corresponding terminal connection part 111, 121. The positions of the upper surfaces 40D of the five capacitor components 30 only need to be aligned to such an extent that they do not prevent the gun from advancing in the X direction. The positions of the connecting parts 55, 65 of the five capacitor components 30 only need to be aligned to such an extent that they do not prevent the gun from advancing in the X direction. As an example, as shown in FIG. 10, the positions of the connecting parts 55, 65 in the Z direction are located above the positions of the third relay pieces 114C, 124C in the Z direction. The positions of the upper ends of the external connection parts 54, 64 and the positions of the upper ends of the terminal connection parts 111, 121 are aligned in the Z direction. Note that the lengths of the external connection parts 54 and 64 in the Z direction are the same.

[0058] The gun moves in the X direction while welding and joining each external connection part 54, 64 and each terminal connection part 111, 121 at the central positions of the external connection parts 54, 64 in the Z direction. If the positions of the connecting part 55 and the connecting part 65 in the Z direction deviate from each other by a predetermined distance or more, it is impossible to weld and join the two without moving the gun in the Z direction. The predetermined distance is, for example, half of the length of the external connection parts 54, 64 in the Z direction. The following is an example of the case where the position of the connecting part 65 in the Z direction is located above the position of the connecting part 55 in the Z direction by a predetermined distance or more. After the gun joins the external connection part 54 and the terminal connection part 111, when it tries to move in the X direction to join the external connection part 64 and the terminal connection part 121, it contacts the external connection part 64. The smooth movement of the gun in the X direction is inhibited.

[0059] As a condition for the cancer to move smoothly in the X direction, the Z-direction positions of the connecting portions 55 and 65 only need to be suppressed to less than half of the lengths of the external connection portions 54 and 64. More preferably, it is desirable that the Z-direction positions of the connecting portions 55 and 65 are suppressed to less than 25 percent of the external connection portions 54 and 64. Although the above has described a configuration in which the connecting portion 55 and the connecting portion 65 are adjacent to each other as an example, the same applies to configurations in which the connecting portion 65F and the connecting portion 65S, and the connecting portion 55F and the connecting portion 55S are adjacent to each other.

[0060] <Function and effect> The capacitor device 100 includes a plurality of capacitor elements 40, a plurality of first electrode terminals 50, and a plurality of second electrode terminals 60. The capacitor element 40 has a first end face 40A and a second end face 40B that are spaced apart in the X direction. The first electrode terminal 50 has electrode connection portions 51 and 52 connected to the first end face 40A. The second electrode terminal 60 has electrode connection portions 61 and 62 connected to the second end face 40B.

[0061] A plurality of capacitor elements 40 are arranged along the X direction such that the first end faces 40A face each other and the second end faces 40B face each other in the X direction. Among the plurality of capacitor elements 40, the electrode connection portions 51 and 52 respectively connected to the first end face 40A are arranged so as to be displaced with respect to at least one of the Y direction and the Z direction. Among the plurality of capacitor elements 40, the electrode connection portions 61 and 62 respectively connected to the second end face 40B are arranged so as to be displaced with respect to at least one of the Y direction and the Z direction.

[0062] According to this, on the first end face 40A, the electrode connection portions 51 and 52 provided thereon are prevented from overlapping in the X direction. Therefore, heat concentration between the electrode connection portions 51 and 52 is suppressed. On the second end face 40B, the electrode connection portions 61 and 62 provided thereon are prevented from overlapping in the X direction. Therefore, heat concentration between the electrode connection portions 61 and 62 is also suppressed. Along with this, the distance between adjacent capacitor elements 40 in the X direction can be reduced. That is, the capacitor device 100 can be miniaturized. Suppression of heat concentration between the electrode connection portions 51 and 52 and between the electrode connection portions 61 and 62 and miniaturization of the capacitor device 100 can be achieved simultaneously.

[0063] The electrode connection portions 51 and 52 respectively connected to the first end face 40A are displaced in both the Y direction and the Z direction, and the electrode connection portions 61 and 62 respectively connected to the second end face 40B are displaced in both the Y direction and the Z direction. According to this, heat concentration between the electrode connection portions 51 and 52 and between the electrode connection portions 61 and 62 can be more effectively suppressed.

[0064] The capacitor element 40 further has a side face 40C connecting the first end face 40A and the second end face 40B. The first electrode terminal 50 further has a connecting portion 55 and an external connection portion 54. The connecting portion 55 is electrically connected to the electrode connection portions 51 and 52 and extends along the side face 40C toward the second end face 40B. The external connection portion 54 is connected to the connecting portion 55 and is connected to the inverter 11. Similarly, the second electrode terminal 60 also further has a connecting portion 65 and an external connection portion 64. The connecting portion 65 is electrically connected to the electrode connection portions 61 and 62 and extends along the upper face 40D along which the connecting portion 55 is located toward the first end face 40A. The external connection portion 64 is connected to the connecting portion 65 and is connected to the inverter 11.

[0065] According to this configuration, in one capacitor component 30, current flows between the external connection portion 54 and the external connection portion 64 via the connection portion 55, the electrode connection portions 51 and 52, the capacitor element 40, the electrode connection portions 61 and 62, and the connection portion 65. At this time, the direction of the current flowing through the connection portion 55 is opposite to the direction of the current flowing through the connection portion 65. Accordingly, the direction of the magnetic field formed around the connection portion 55 is opposite to the direction of the magnetic field formed around the connection portion 65. Therefore, the magnetic field around the connection portion 55 and the magnetic field around the connection portion 65 cancel each other out. According to this, the inductance of the energization path between the external connection portion 54 and the external connection portion 64 can be suppressed. Along with this, it is possible to suppress an increase in the surge voltage generated in the inverter 11.

[0066] Regarding the first electrode terminal 50, the adjacent arms 53F and 53S in the X direction are in partial contact with each other in the X direction. Regarding the second electrode terminal 60, the adjacent arms 63F and 63S in the X direction are also in partial contact with each other in the X direction. According to this, the physical size of the capacitor device 100 in the X direction can be reduced. Since the arms 53F and 53S, and the arms 63F and 63S are at the same potential as each other, it is not necessary to secure an insulation distance, and thus the capacitor device 100 can be reduced in size by bringing them into contact with each other.

[0067] The capacitor device 100 further includes bus bars 110 and 120 that connect the external connection portions 54 and 64 to the inverter 11. The external connection portions 54 and 64 stand upright in the Z direction from the connection portions 55 and 65. The terminal connection portions 111 and 121 of the bus bars 110 and 120 extend in the Z direction along the external connection portions 54 and 64. The terminal connection portions 111 and 121 are joined to the external connection portions 54 and 64. According to this, the manufacturability is good when welding and joining the terminal connection portions 111 and 121 so as to sandwich the external connection portions 54 and 64.

[0068] Furthermore, the Z-direction positions of the connecting portion 55 and the connecting portion 65 are aligned across a plurality of capacitor elements 40 arranged in the X direction to such an extent that the movement of the welding machine in the X direction is not hindered. According to this, it is possible to weld the terminal connection portions 111 and 121 and the external connection portions 54 and 64 without changing the position of the welding machine in the Z direction. During manufacturing, it is easy to join the terminal connection portions 111 and 121 and the external connection portions 54 and 64. Note that the welding machine may be referred to as a joining device.

[0069] (Second Embodiment) In the first embodiment, the form in which the connecting portion 55 and the connecting portion 65 are separated from the upper surface 40D in the Z direction has been described. However, the Z-direction positional relationship between the connecting portions 55 and 65 and the upper surface 40D is not limited to this. FIG. 14 is a partial side view of the capacitor 20 for explaining the second embodiment. FIG. 14 shows a side view of the first capacitor component 31 as seen from the first end face 40A side as a representative. Note that the description of the first electrode terminal 50 is omitted in FIG. 14.

[0070] The connecting portion 55, the arm 53, the connecting portion 65, and the arm 63 form a part of an energization path through which current flows between the external connection portion 54 and the external connection portion 64. In the second embodiment, the connecting portion 55 and the connecting portion 65 are in contact with the upper surface 40D. In the second embodiment, the length of the arm 53 and the length of the arm 63 in the Z direction are shorter than those in the first embodiment, respectively. Accordingly, in the second embodiment, the length of the energization path between the external connection portion 54 and the external connection portion 64 can be shortened. Further, since the arm 53 and the arm 63 form a part of the energization path, the inductance of the arm 53 and the arm 63 decreases as the length becomes shorter. Accordingly, the inductance in the energization path between the external connection portion 54 and the external connection portion 64 can be reduced. Note that the form in which both the connecting portion 55 and the connecting portion 65 are in contact with the upper surface 40D is not limiting. The same effect can be obtained if at least one of the connecting portion 55 and the connecting portion 65 provided on the same capacitor component 30 is in contact with the upper surface 40D.

[0071] (Third Embodiment) In the first embodiment, the form in which the upper edges of the arms 53F and 63F are located above the upper surface 40D has been described. However, the positional relationship between the upper edges of the arms 53F and 63F and the upper surface 40D is not limited to this. FIG. 15 is a partial perspective view of the capacitor 20 for explaining the third embodiment. In the third embodiment, the arm 53F has a base portion 53FA extending in the Z direction and an extension portion 53FB extending in the Y direction. The base portion 53FA extends from the connecting portion 55 toward the lower surface 40E. The extension portion 53FB is integrally connected to the end portion on the lower surface 40E side of the base portion 53SA. The extension portion 53FB extends in the Y direction from one end side to the other end side along the first end surface 40A.

[0072] In the third embodiment, the upper end portion of the extension portion 53FB coincides with the Z-direction position of the upper surface 40D or is lower than the Z-direction position of the upper surface 40D. In the third embodiment, all of the extension portion 53FB faces the first end surface 40A in the X direction. Although the description is omitted, the same applies to the arm 63F. According to this, when the sealing resin 160 is filled, the flow of the sealing resin 160 is suppressed from being inhibited by the extension portions 53FB and 63FB.

[0073] (Fourth Embodiment) In the first embodiment, the form in which the external connection portions 54 and 64 standing upright in the Z direction and the terminal connection portions 111 and 121 standing upright in the Z direction are joined in the Y direction has been described. However, the joining form of the external connection portions 54 and 64 and the terminal connection portions 111 and 121 is not limited to this. FIG. 16 is a partial perspective view of the capacitor device 100 for explaining the fourth embodiment. In the fourth embodiment, the external connection portions 54 and 64 and the terminal connection portions 111 and 121 extend along the XY plane. The external connection portions 54 and 64 and the terminal connection portions 111 and 121 overlap each other in the Z direction and are joined to each other.

[0074] (Fifth Embodiment) In the first embodiment, the form in which the capacitor 20 is housed in the capacitor case 150 and fixed to the capacitor case 150 via the sealing resin 160 has been described. However, the housing and fixing form of the capacitor 20 is not limited to this. FIG. 17 is a side view of the power conversion device 10 for explaining the fifth embodiment. In the fifth embodiment, a housing chamber 14A for housing only the capacitor 20 is provided in the case 14. In the fifth embodiment, the capacitor 20 is not housed in the capacitor case 150. In the fifth embodiment, the capacitor 20 is directly housed in the housing chamber 14A. And a sealing resin 160 is provided in the housing chamber 14A. In the fifth embodiment, the capacitor 20 is fixed to the housing chamber 14A via the sealing resin 160.

[0075] (Sixth Embodiment) In the first embodiment, the form in which the first electrode terminal 50 has two electrode connection portions 51 and 52 and the second electrode terminal 60 has two electrode connection portions 61 and 62 has been described. However, the number of electrode connection portions of the first electrode terminal 50 and the second electrode terminal 60 is not limited to two respectively. FIG. 18 is a partial perspective view of the capacitor 20 for explaining the sixth embodiment. In the sixth embodiment, the first electrode terminal 50 has only one electrode connection portion 52, and the second electrode terminal 60 has only one electrode connection portion 62.

[0076] In the sixth embodiment, the electrode connection portion 52S and the electrode connection portion 52F provided on the first end face 40A are displaced in the Y direction and the Z direction. The electrode connection portion 62S and the electrode connection portion 62F provided on the second end face 40B are displaced in the Y direction and the Z direction. Thus, the same effect as that of the first embodiment is achieved. Note that the number of electrode connection portions of the first electrode terminal 50 and the number of electrode connection portions of the second electrode terminal 60 may be different. It is only necessary that the electrode connection portions provided on the end faces 40A and 40B facing each other in the X direction are displaced in at least one of the Y direction and the Z direction.

[0077] (Other Embodiments) In the first embodiment, the capacitor 20 has been described as having five capacitor components 30. However, the number of capacitor components 30 included in the capacitor 20 is not limited to five. For example, the number of capacitor components 30 included in the capacitor 20 may be two. In that case, two capacitor elements 40 are arranged along the X direction such that the first end faces 40A face each other or the second end faces 40B face each other in the X direction.

[0078] In that case, among the two capacitor elements 40, the electrode connection portions 51 and 52 respectively connected to the first end face 40A are arranged offset with respect to at least one of the Y direction and the Z direction. Alternatively, among a plurality of capacitor elements 40, the electrode connection portions 61 and 62 respectively connected to the second end face 40B are arranged offset with respect to at least one of the Y direction and the Z direction.

[0079] According to this, it is possible to suppress the electrode connection portions 51 and 52 provided on the end faces 40A and 40B from overlapping each other in the X direction, or the electrode connection portions 61 and 62 from overlapping each other in the X direction. It is possible to suppress heat concentration from occurring between the electrode connection portions 51 and 52 or between the electrode connection portions 61 and 62. Accordingly, the distance between adjacent capacitor elements 40 in the X direction can be reduced.

[0080] Although the present disclosure has been described in accordance with the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, although various combinations and forms are shown in the present disclosure, other combinations and forms including only one element, more than one element, or less than one element thereof are also within the scope and spirit of the present disclosure.

[0081] (Disclosure of Technical Idea) This specification discloses a plurality of technical ideas described in a plurality of clauses listed below. Some clauses may be described in a multiple dependent form that alternatively quotes a preceding clause in subsequent clauses. Some clauses may be described in a multiple dependent form that quotes another multiple dependent form clause. The clauses described in these multiple dependent forms define a plurality of technical ideas.

[0082] (Technical idea 1) A plurality of capacitor elements (40) each having a first end face (40A) and a second end face (40B) spaced apart in the width direction (X); A plurality of first electrode terminals (50) each having a first electrode connection part (51, 52) connected to a first electrode formed on the first end face and provided individually for each of the capacitor elements; A plurality of second electrode terminals (60) each having a second electrode connection part (61, 62) connected to a second electrode formed on the second end face and provided individually for each of the capacitor elements, and comprising: The plurality of capacitor elements are arranged along the width direction such that the first end faces and / or the second end faces face each other in the width direction; The capacitor device, wherein the first electrode connection parts respectively connected to the first electrodes facing each other in the width direction and / or the second electrode connection parts respectively connected to the second electrodes facing each other in the width direction are displaced with respect to at least one of a height direction (Z) which is one of the directions orthogonal to the width direction and a depth direction (Y) orthogonal to both the width direction and the height direction.

[0083] (Technical idea 2) The capacitor device according to Technical Idea 1, wherein the first electrode connection portions respectively connected to the first electrodes facing each other in the width direction, and / or the second electrode connection portions respectively connected to the second electrodes facing each other in the width direction are displaced and arranged with respect to both the height direction and the depth direction.

[0084] (Technical Idea 3) The capacitor element further has a side surface (40C) connecting the first end surface and the second end surface. The first electrode terminal further has a first current conducting portion (55) that is electrically connected to the first electrode connection portion and extends along the side surface toward the second end surface, and a first external connection portion (54) that is connected to the first current conducting portion and is connected to an external device (11). The second electrode terminal further has a second current conducting portion (65) that is electrically connected to the second electrode connection portion and extends along the side surface along which the first current conducting portion extends toward the first end surface, and a second external connection portion (64) that is connected to the second current conducting portion and is connected to the external device. A current is flowing from one of the first external connection portion and the second external connection portion to the other through the capacitor element. The capacitor device according to Technical Idea 1 or 2, wherein the direction of the current flowing through the first current conducting portion is opposite to the direction of the current flowing through the second current conducting portion.

[0085] (Technical Idea 4) The first electrode terminal further has a first arm (53) that connects the first electrode connection portion and the first current conducting portion and extends along the first end surface. The second electrode terminal further has a second arm (63) that connects the second electrode connection portion and the second current conducting portion and extends along the second end surface. The capacitor device according to Technical Idea 3, wherein the first arms respectively connected to the first electrodes facing each other in the width direction, and / or the second arms respectively connected to the second electrodes facing each other in the width direction are in contact with each other in the width direction.

[0086] (Technical idea 5) The capacitor device according to Technical Idea 3 or 4, wherein at least one of the first current conducting portion and the second current conducting portion is in contact with the side surface.

[0087] (Technical idea 6) The capacitor device further includes bus bars (110, 120) that connect the external connection portions (54, 64) including the first external connection portion and the second external connection portion to the external device. The external connection portion stands upright in the height direction from the current conducting portion (55, 65) including the first current conducting portion and the second current conducting portion. In the bus bar, the terminal connection portions (111, 121) connected to the external connection portion extend in the height direction along the external connection portion. The capacitor device according to any one of Technical Ideas 3 to 5, wherein the external connection portion and the terminal connection portion are joined in the depth direction.

[0088] (Technical idea 7) The capacitor device according to Technical Idea 6, wherein the positions of the first current conducting portion and the second current conducting portion in the height direction are aligned across a plurality of the capacitor elements arranged in the width direction to such an extent that the movement of the joining device that joins the external connection portion and the terminal connection portion in the depth direction is not hindered.

Explanation of reference numerals

[0089] 11 Inverter, 40 Capacitor element, 40A First end face, 40B Second end face, 40C Side face, 50 First electrode terminal, 51, 52 Electrode connection portion, 53 Arm, 54 External connection portion, 54 External connection portion, 55 Connecting portion, 60 Second electrode terminal, 61, 62 Electrode connection portion, 63 Arm, 64 External connection portion, 65 Connecting portion, 110 High - potential side bus bar, 111 Inverter connection portion, 120 Low - potential side bus bar, 121 Terminal connection portion, X Width direction, Y Depth direction, Z Height direction.

Claims

1. A plurality of capacitor elements (40) each having a first end face (40A) and a second end face (40B) spaced apart in the width direction (X), a plurality of first electrode terminals (50) provided individually for each of the capacitor elements, having first electrode connection portions (51, 52) connected to the first electrodes formed on the first end face, a plurality of second electrode terminals (60) provided individually for each of the capacitor elements, having second electrode connection portions (61, 62) connected to the second electrodes formed on the second end face, and the plurality of capacitor elements are arranged along the width direction such that the first end faces face each other and / or the second end faces face each other in the width direction, a capacitor device in which the first electrode connection portions each connected to the first electrodes facing each other in the width direction and / or the second electrode connection portions each connected to the second electrodes facing each other in the width direction are displaced with respect to at least one of the height direction (Z), which is one of the directions orthogonal to the width direction, and the depth direction (Y), which is orthogonal to both the width direction and the height direction.

2. The capacitor device according to claim 1, wherein the first electrode connection portions each connected to the first electrodes facing each other in the width direction and / or the second electrode connection portions each connected to the second electrodes facing each other in the width direction are displaced with respect to both the height direction and the depth direction.

3. The capacitor element further has a side face (40C) connecting the first end face and the second end face, the first electrode terminal further has a first current conducting portion (55) electrically connected to the first electrode connection portion and extending along the side face toward the second end face, and a first external connection portion (54) connected to the first current conducting portion and to an external device (11), the second electrode terminal further has a second current conducting portion (65) electrically connected to the second electrode connection portion and extending along the side face along which the first current conducting portion extends toward the first end face, and a second external connection portion (64) connected to the second current conducting portion and to the external device, a current flows from one of the first external connection portion and the second external connection portion to the other through the capacitor element, and the capacitor device according to claim 2, wherein the direction of the current flowing through the first current conducting portion and the direction of the current flowing through the second current conducting portion are opposite to each other.

4. The first electrode terminal further has a first arm (53) that connects the first electrode connection portion and the first current-carrying portion and extends along the first end face. The second electrode terminal further has a second arm (63) that connects the second electrode connection portion and the second current-carrying portion and extends along the second end face. The capacitor device according to claim 3, wherein the first arms connected to the first electrodes facing each other in the width direction and / or the second arms connected to the second electrodes facing each other in the width direction are in contact with each other in the width direction.

5. The capacitor device according to claim 4, wherein at least one of the first current-carrying portion and the second current-carrying portion is in contact with the side face.

6. The capacitor device further includes bus bars (110, 120) that connect external connection portions (54, 64) including the first external connection portion and the second external connection portion to the external device. The external connection portion stands upright in the height direction from a current-carrying portion (55, 65) including the first current-carrying portion and the second current-carrying portion. In the bus bar, terminal connection portions (111, 121) connected to the external connection portion extend in the height direction along the external connection portion. The capacitor device according to any one of claims 3 to 5, wherein the external connection portion and the terminal connection portion are joined in the depth direction.

7. The capacitor device according to claim 6, wherein the heights of the first current-carrying portion and the second current-carrying portion are aligned across a plurality of the capacitor elements arranged in the width direction to such an extent that the movement of the joining device that joins the external connection portion and the terminal connection portion in the depth direction is not hindered.

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