Capacitor and method for manufacturing capacitor

Abstract

The capacitor is provided with: a capacitor element having electrodes on both end surfaces; a bus bar connected to the electrode; and an exterior body formed of a resin and covering a part of the capacitor element and the bus bar. The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion. The connection terminal portion has a flat connection surface to which an external terminal is connected, and is exposed from the exterior body. A surface of the connection terminal portion on the opposite side of the connection surface is located at a position away from one surface of the exterior body so as to face the one surface. The first extension portion and the second extension portion extend from both ends of the connection terminal portion in the first direction in a direction intersecting the connection surface, respectively, and are embedded inside the exterior body. The first extension portion is connected to the electrode in the exterior body.

Description

Technical Field

[0001] The present invention relates to a capacitor such as a film capacitor and further relates to a method for manufacturing the capacitor. Background Art

[0002] Conventionally, capacitors are known in which one or more capacitor elements are covered with an outer casing made of a thermosetting resin such as epoxy resin. Such capacitors include so-called case molded capacitors and so-called caseless capacitors.

[0003] Case-molded capacitors have a case that houses the capacitor element. The case is filled with a thermosetting resin and cured to form an outer casing. Caseless capacitors, for example, house the capacitor element in a casting mold, which is then filled with a thermosetting resin. After the thermosetting resin cures to form the outer casing, the capacitor is removed from the casting mold.

[0004] As an example of such a capacitor, Patent Document 1 describes a case-molded capacitor in which a capacitor element, with lead terminals serving as busbars connected to both end surfaces, is housed within a case, which is then filled with molding resin. The capacitor element is coated with the molding resin, while one end of the lead terminal is exposed from the molding resin as a terminal portion for external connection.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2006-294788 Summary of the Invention

[0008] The first embodiment of the present invention relates to a capacitor. The capacitor involved in this embodiment comprises: a capacitor element having electrodes on both end surfaces; a bus bar connected to the electrodes; and an outer casing formed of resin, covering the capacitor element and a portion of the bus bar. Here, the bus bar includes a connecting terminal portion, a first extension portion, and a second extension portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected, and is exposed from the outer casing. The surface of the connecting terminal portion opposite to the connecting surface is located away from one surface of the outer casing in a manner that faces the surface. The first extension portion and the second extension portion extend from both ends of the connecting terminal portion in the first direction, respectively, in a direction intersecting with the connecting surface, and are buried in the interior of the outer casing. The first extension portion is connected to the electrodes inside the outer casing.

[0009] The second embodiment of the present invention relates to a capacitor. The capacitor involved in this embodiment comprises: a capacitor element having electrodes on both end surfaces; a bus bar connected to the electrodes; and an outer casing formed of resin and covering the capacitor element and a portion of the bus bar. Here, the bus bar includes a connecting terminal portion, a first extension portion, and a second extension portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected, and is exposed from the outer casing. The surface of the connecting terminal portion opposite to the connecting surface is located away from one surface of the outer casing in a manner that faces the surface. The first extension portion extends from the end of the connecting terminal portion in the first direction in a direction intersecting with the connecting surface and is embedded in the interior of the outer casing. The second extension portion extends from both ends of the connecting terminal portion in a second direction perpendicular to the first direction in a direction intersecting with the connecting surface and is embedded in the interior of the outer casing. The first extension portion is connected to the electrodes inside the outer casing.

[0010] A third aspect of the present invention relates to a method for manufacturing a capacitor. This method comprises: a placement step of placing a capacitor module comprising a capacitor element having electrodes on both end surfaces and a bus bar connected to the electrodes within a casting mold having an opening; an injection step of injecting a liquid thermosetting resin from the opening into the casting mold having the capacitor module; and a curing step of heating and curing the thermosetting resin filling the casting mold to form an outer casing covering the capacitor element and a portion of the bus bar. The bus bar includes a connecting terminal portion, a first extending portion, and a second extending portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected. The first and second extending portions extend from both ends of the connecting terminal portion in a first direction, respectively, in a direction intersecting the connecting surface, toward the capacitor element. The first extending portion is connected to the electrodes. In the placement step, the capacitor module is placed within the casting mold with the connecting terminal portion facing the opening. In the injection process, the thermosetting resin is injected into the casting mold box so that the liquid surface of the thermosetting resin which becomes the casting surface of the outer body and the surface of the connecting terminal portion opposite to the connecting surface are separated and opposite to each other, and the front end of the first extension portion and the front end of the second extension portion are buried in the interior of the thermosetting resin.

[0011] A fourth aspect of the present invention relates to a method for manufacturing a capacitor. The manufacturing method of this aspect comprises: a placement step of placing a capacitor module comprising a capacitor element having electrodes on both end surfaces and a bus bar connected to the electrodes within a casting mold having an opening; an injection step of injecting a liquid thermosetting resin from the opening into the casting mold having the capacitor module; and a curing step of heating and curing the thermosetting resin filling the casting mold to form an outer casing covering the capacitor element and a portion of the bus bar. The bus bar includes a connecting terminal portion, a first extending portion, and a second extending portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected. The first extending portion extends from an end of the connecting terminal portion in a first direction, along a direction intersecting the connecting surface, toward the capacitor element, and is connected to the electrode. The second extending portion extends from both ends of the connecting terminal portion in a second direction perpendicular to the first direction, along a direction intersecting the connecting surface, toward the capacitor element. In the placement step, the capacitor module is placed in the casting mold with the connection terminal portion facing the opening. In the injection step, the thermosetting resin is injected into the casting mold such that the liquid level of the thermosetting resin, which becomes the casting surface of the exterior body, and the surface of the connection terminal portion opposite to the connection surface are separated and face each other, and the front ends of the first extension portion and the second extension portion are embedded in the thermosetting resin.

[0012] According to the present invention, it is possible to provide a capacitor capable of smoothly connecting a connection terminal portion of a bus bar exposed from an exterior body to an external terminal, and a capacitor manufacturing method capable of manufacturing the capacitor.

[0013] The effects and significance of the present invention will become more apparent from the description of the following embodiments. However, the following embodiments are merely examples of how to implement the present invention, and the present invention is not limited in any way by the contents described in the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A This is a perspective view of the capacitor according to the first embodiment.

[0015] Figure 1B This is a cross-sectional view of the capacitor according to the first embodiment, cut parallel to the YZ plane at the position of a pair of bus bars.

[0016] Figure 2A This is a perspective view of the capacitor module according to the first embodiment.

[0017] Figure 2BThis is a perspective view of a pair of bus bars according to the first embodiment.

[0018] Figure 3A This is a diagram for explaining the process of forming the exterior body according to the first embodiment.

[0019] Figure 3B This is a diagram for explaining the process of forming the exterior body according to the first embodiment.

[0020] Figure 3C This is a diagram for explaining the process of forming the exterior body according to the first embodiment.

[0021] Figure 4A This is a cross-sectional view of the capacitor according to Modification 1 of Embodiment 1, cut along the position of a pair of bus bars in parallel with the YZ plane.

[0022] Figure 4B This is a perspective view of a bus bar according to Modification 1 of Embodiment 1.

[0023] Figure 5A This is a cross-sectional view of a capacitor according to Modification 2 of Embodiment 1, cut parallel to the YZ plane at the position of a pair of bus bars.

[0024] Figure 5B This is a perspective view of a bus bar according to Modification 2 of Embodiment 1.

[0025] Figure 6A This is a cross-sectional view of a capacitor according to Modification 3 of Embodiment 1, cut along a line parallel to the YZ plane at the position of a pair of bus bars.

[0026] Figure 6B This is a perspective view of a bus bar according to Modification 3 of Embodiment 1.

[0027] Figure 7A This is a cross-sectional view of a capacitor according to Modification 4 of Embodiment 1, cut along the position of a pair of bus bars in parallel with the XZ plane.

[0028] Figure 7B This is a diagram of a bus bar according to Modification 4 of Embodiment 1 as viewed in the positive Y-axis direction.

[0029] Figure 8A This is a perspective view of a capacitor according to Modification 5 of Embodiment 1.

[0030] Figure 8B This is a perspective view of a capacitor module according to Modification 5 of Embodiment 1.

[0031] Figure 9AThis is a plan view showing a state in which a capacitor is fixed to an external device using a fixing member according to Modification 5 of Embodiment 1.

[0032] Figure 9B yes Figure 9A A-A' cross-sectional view.

[0033] Figure 10A This is a diagram for explaining a pair of bus bars according to another modified example of the first embodiment.

[0034] Figure 10B This is a diagram for explaining a pair of bus bars according to another modified example of the first embodiment.

[0035] Figure 10C This is a diagram for explaining a pair of bus bars according to another modified example of the first embodiment.

[0036] Figure 10D This is a diagram for explaining a pair of bus bars according to another modified example of the first embodiment.

[0037] Figure 11A This is a diagram of the capacitor according to the second embodiment as viewed in the negative direction of the Z axis.

[0038] Figure 11B This is a diagram of the capacitor according to the second embodiment as viewed in the negative direction of the X-axis.

[0039] Figure 12A This is the second embodiment Figure 11A BB' cross-sectional view.

[0040] Figure 12B This is the second embodiment Figure 11A C-C' cross-sectional view.

[0041] Figure 13 This is an exploded perspective view of the capacitor module according to the second embodiment.

[0042] Figure 14A This is a diagram of the bus bar according to Modification 1 of Embodiment 2 as viewed in the positive direction of the Y axis.

[0043] Figure 14B This is a diagram of a bus bar according to Modification 2 of Embodiment 2 as viewed in the positive direction of the Y axis.

[0044] Figure 15A This is a diagram of a capacitor according to Modification 3 of Embodiment 2 as viewed in the negative Z-axis direction.

[0045] Figure 15B This is a diagram of a capacitor provided with a fixing member according to the second embodiment as viewed in the negative direction of the X-axis. DETAILED DESCRIPTION

[0046] In the shell molded capacitor of Patent Document 1, a terminal portion for external connection extends straight outward from one side of the molded resin, and an external terminal included in an inverter circuit, etc. is connected to one of the two surfaces of the terminal portion along the extending direction by a connection method such as welding.

[0047] During the connection operation, the external terminal must be pressed against one surface of the terminal portion and securely adhered to it, so some type of jig is required to support the other surface of the terminal portion. Therefore, in the case molded capacitor structure described above, there is a concern that the connection operation using welding or the like may be laborious.

[0048] Therefore, the present invention provides a capacitor capable of smoothly connecting a connection terminal portion of a bus bar exposed from an exterior body to an external terminal, and a capacitor manufacturing method capable of manufacturing the capacitor.

[0049] The embodiments of the present invention are described below with reference to the drawings. For convenience, the drawings include mutually orthogonal X-axis, Y-axis, and Z-axis. The Y-axis is perpendicular to the pair of end faces 101 of the capacitor element 100 .

[0050] <Implementation Method 1>

[0051] Embodiment 1 is an embodiment of a method for manufacturing a capacitor according to the first aspect of the present invention and a capacitor according to the third aspect of the present invention.

[0052] Figure 1A It is a perspective view of capacitor 1 according to the first embodiment. Figure 1B This is a cross-sectional view of the capacitor 1 according to the first embodiment, cut parallel to the YZ plane at the position of the pair of bus bars 200 . Figure 2A is a perspective view of the capacitor module 10 according to the first embodiment. Figure 2B This is a perspective view of a pair of bus bars 200 according to the first embodiment.

[0053] Capacitor 1 is a so-called caseless type capacitor, and includes capacitor element 100, a pair of bus bars 200, and an exterior body 300. Capacitor module 10 is formed by connecting the pair of bus bars 200 to capacitor element 100.

[0054] Capacitor element 100 is a film capacitor element formed by overlapping two metallized films with aluminum vapor-deposited on dielectric films, winding or stacking the overlapped metallized films, and pressing them to form a shape that is approximately a flat, long cylinder. Capacitor element 100 has a pair of end faces 101 and a peripheral surface 102. Peripheral surface 102 is composed of a pair of flat surfaces 102a arranged along the Z-axis direction and a pair of curved surfaces 102b arranged along the X-axis direction. In capacitor element 100, electrodes 110 are formed on both end faces 101 by spraying a metal such as zinc.

[0055] Furthermore, in addition to being formed by vapor-depositing a metalized film of aluminum on a dielectric film, capacitor element 100 may also be formed by vapor-depositing a metalized film of another metal, such as zinc or magnesium. Alternatively, capacitor element 100 may be formed by vapor-depositing a metalized film of multiple metals among these metals, or by vapor-depositing a metalized film of an alloy of these metals.

[0056] The pair of bus bars 200 are formed of a conductive material, such as copper. Each bus bar 200 includes a connection terminal portion 210 , a first extension portion 220 , and a second extension portion 230 .

[0057] The connection terminal portion 210 is formed in a square plate shape and has a flat connection surface 211 connected to the external terminal 4. The connection surface 211 faces the positive direction of the Z axis.

[0058] The first extension portion 220 and the second extension portion 230 are formed in a square plate shape and extend from both ends 210a of the connection terminal portion 210 in the Y-axis direction in the negative Z-axis direction perpendicular to the connection surface 211. The Y-axis direction is the first direction. In this embodiment, the first direction is perpendicular to the end surface 101 of the capacitor element 100.

[0059] The first extension portion 220 is longer in the Z-axis direction than the second extension portion 230. A pair of pin-shaped electrode terminals 221 arranged in the X-axis direction are formed at the front end (the negative end in the Z-axis direction) of the first extension portion 220.

[0060] The pair of bus bars 200 are arranged side by side along the Y-axis. The connection terminal portions 210 of the pair of bus bars 200 are located on the positive Z-axis side relative to the capacitor element 100. In the direction in which the capacitor element 100 and the connection terminal portions 210 are arranged (the Z-axis direction), the connection surfaces 211 of the connection terminal portions 210 of each bus bar 200 are positioned in the same direction.

[0061] Busbar 200, located on the positive Y-axis side relative to capacitor element 100, is assembled to capacitor element 100 in the following orientation: first extension portion 220 faces the positive Y-axis side, and second extension portion 230 faces the negative Y-axis side relative to connection terminal portion 210. The tip of first extension portion 220 of busbar 200 overlaps electrode 110 on the positive Y-axis side of capacitor element 100, and a pair of electrode terminals 221 are bonded to electrode 110 using a bonding method such as brazing. This electrically connects busbar 200 to capacitor element 100.

[0062] Similarly, busbar 200, located on the negative Y-axis side relative to capacitor element 100, is assembled to capacitor element 100 in the following orientation: first extension portion 220 faces the negative Y-axis side, and second extension portion 230 faces the positive Y-axis side relative to connection terminal portion 210. The tip of first extension portion 220 of busbar 200 overlaps electrode 110 on the negative Y-axis side of capacitor element 100, and a pair of electrode terminals 221 are bonded to electrode 110 by a bonding method such as brazing. This electrically connects busbar 200 to capacitor element 100.

[0063] In the pair of bus bars 200 , the connection terminal portions 210 overlap the peripheral surface 102 (flat surface 102 a ) of the capacitor element 100 when viewed in the Z-axis direction. The distal end (the negative end in the Z-axis direction) of the second extension portion 230 is spaced away from the peripheral surface 102 (flat surface 102 a ) of the capacitor element 100 .

[0064] The outer casing 300 is formed from a thermosetting resin 3 such as epoxy resin and has a generally rectangular parallelepiped (hexahedral) shape that is elongated in the X-axis direction, with its outer surface consisting of six square faces. The outer casing 300 covers the capacitor module 10, specifically, the entire capacitor element 100 and a portion of the pair of bus bars 200. The outer casing 300 protects the capacitor element 100 from moisture intrusion and impact.

[0065] As will be described later, the outer casing 300 is formed by a casting method using the casting mold 2. Of the six surfaces of the outer casing 300, the surface on the positive Z-axis side (one surface of the outer casing 300) serves as a casting surface 301 formed by curing the liquid surface 3a of the thermosetting resin 3 injected into the casting mold 2.

[0066] like Figure 1B As shown, in a pair of busbars 200, connection terminal portions 210 are exposed to the outside from a casting surface 301 of an exterior body 300. Furthermore, connection terminal portions 210 are located away from the casting surface 301, with surfaces 212 opposite to connection surfaces 211 facing the casting surface 301 of the exterior body 300.

[0067] In first extending portion 220 , the tip portion thereof is embedded into exterior package 300 from casting surface 301 and is connected to electrode 110 of capacitor element 100 within exterior package 300 .

[0068] The tip of second extension portion 230 is embedded within exterior body 300 from casting surface 301. Within exterior body 300, it extends toward peripheral surface 102 (flat surface 102a) of capacitor element 100, which faces casting surface 301. The tip of second extension portion 230 does not contact peripheral surface 102; instead, a portion of exterior body 300 is interposed between the tip of second extension portion 230 and peripheral surface 102. This prevents damage to peripheral surface 102 of capacitor element 100 from second extension portion 230.

[0069] Figures 3A to 3C This is a diagram for explaining the process of forming the exterior body 300 according to the first embodiment.

[0070] The exterior body 300 is formed by a casting method using the casting mold 2. This allows the exterior body 300 to be formed more simply than by a molding method using a die.

[0071] The casting mold box 2 is made of metal, for example, and is formed into a substantially rectangular parallelepiped box shape corresponding to the shape of the exterior body 300 , and has an opening 2 a on the upper surface.

[0072] In the process of forming the outer body 300, first, a setting process is performed. Figure 3A As shown, the capacitor module 10 is housed in the casting mold 2 through the opening 2a. The capacitor module 10 is placed in the casting mold 2 with the connection terminal portions 210 of the pair of bus bars 200 facing the opening 2a. At this time, the connection terminal portions 210 of the pair of bus bars 200 are fixed with a fixing tool (not shown), and the capacitor element 100 is positioned relative to the casting mold 2.

[0073] Next, the injection process is performed. Figure 3B As shown, a liquid thermosetting resin 3, such as an epoxy resin, is injected into the casting mold 2 through the opening 2a. The entire capacitor element 100 and the tips of the first and second extension portions 220 and 230 of the pair of busbars 200 are embedded within the thermosetting resin 3. The liquid level 3a of the thermosetting resin 3 is spaced apart from and faces the surface 212 opposite the connection surface 211 of the connection terminal portions 210 of the pair of busbars 200. Furthermore, the liquid level 3a of the thermosetting resin 3 forms the casting surface 301 of the exterior body 300.

[0074] Thus, the connection terminal portions 210 of the pair of bus bars 200 are spaced away from the liquid level 3a of the thermosetting resin 3. Therefore, unlike a case where the connection terminal portions 210 are in contact with the liquid level 3a of the thermosetting resin 3, the thermosetting resin 3 in liquid phase injected into the mold 2 does not reach the connection surfaces 211 of the connection terminal portions 210 due to surface tension, manufacturing errors, or other factors.

[0075] Next, a curing step is performed in which the mold flask 2 is heated. The thermosetting resin 3 is heated to a high temperature and thereby cured, forming the outer casing 300 .

[0076] When the outer body 300 is formed, Figure 3C As shown, the capacitor 1 is completed. The capacitor 1 is taken out from the mold box 2 for casting.

[0077] When the capacitor 1 is installed in an external device such as an inverter device, one of the pair of bus bars 200 becomes a positive bus bar (P-pole bus bar) and the other becomes a negative bus bar (N-pole bus bar). Figure 3C As shown, the positive (P) and negative (N) external terminals 4 are connected to the respective connection terminal portions 210 of a pair of busbars 200 by laser welding, resistance welding, or the like. During the connection operation, the external terminals 4 can be pressed tightly and closely against the connection surfaces 211 of the connection terminal portions 210.

[0078] In the capacitor 1 of this embodiment, both ends 210a of the connecting terminal portion 210 in the Y-axis direction (first direction) are supported by the first and second extending portions 220, 230 embedded in the exterior body 300. Therefore, even when the external terminal 4 is pressed against the connecting surface 211 of the connecting terminal portion 210, the connecting terminal portion 210 is unlikely to move in the direction of the pressure or in a direction perpendicular to the direction of the pressure. Consequently, since the connecting terminal portion 210 can be held in place without the need for a separate fixture, the laborious installation of a fixture is eliminated, allowing for smooth soldering connection.

[0079] Furthermore, in connection terminal portion 210 , surface 212 opposite connection surface 211 is positioned away from one surface (molding surface 301 ) of exterior body 300 . This allows heat generated by capacitor element 100 when power is supplied to capacitor 1 to be effectively dissipated from both surfaces 211 and 212 of connection terminal portion 210 .

[0080] Furthermore, when the external terminal 4 is pressed against the connection terminal portion 210, force is applied to the outer casing 300 via the first extension portion 220 and the second extension portion 230. Therefore, it is desirable that the outer casing 300 has high strength. Therefore, to increase the strength, a filler may be mixed into the thermosetting resin 3 constituting the outer casing 300.

[0081] <Effects of Implementation Method 1>

[0082] As described above, according to this embodiment, the following effects are achieved.

[0083] Capacitor 1 includes a capacitor element 100 having electrodes 110 on each of its two end surfaces 101; a busbar 200 connected to the electrodes 110; and an exterior casing 300 formed of a thermosetting resin 3 and covering the capacitor element 100 and a portion of the busbar 200. Busbar 200 includes a connecting terminal portion 210, a first extending portion 220, and a second extending portion 230. Connecting terminal portion 210 has a flat connecting surface 211 to which an external terminal 4 is connected, and is exposed from exterior casing 300. A surface 212 of connecting terminal portion 210 opposite connecting surface 211 is located away from one surface of exterior casing 300, facing the surface. The first extending portion 220 and the second extending portion 230 extend from both ends 210a of connecting terminal portion 210 in a first direction (Y-axis direction) in a direction intersecting (orthogonal to) the connecting surface 211 and are embedded within exterior casing 300. The first extension portion 220 is connected to the electrode 110 inside the exterior body 300 .

[0084] According to this structure, since both ends 210a of the connecting terminal portion 210 in the first direction are embedded in the first extension portion 220 and the second extension portion 230 of the outer housing 300 and supported, during the connection operation of the external terminal 4 to the connecting terminal portion 210 by welding or the like, even if the external terminal 4 is pressed against the connection surface 211 of the connecting terminal portion 210, the connecting terminal portion 210 is unlikely to move in the direction of the pressing or in a direction perpendicular to the direction of the pressing. Therefore, since the connecting terminal portion 210 can be held by a separate clamp, the time and effort of setting up a clamp is eliminated, and the connection operation can be performed smoothly.

[0085] Furthermore, in connection terminal portion 210, surface 212 opposite to connection surface 211 is spaced apart from the surface of exterior body 300 where connection terminal portion 210 is exposed. Thus, heat generated by capacitor element 100 when power is supplied to capacitor 1 can be effectively dissipated from both surfaces 211 and 212 of connection terminal portion 210.

[0086] Furthermore, in capacitor 1 , second extension portion 230 extends inside exterior package 300 toward peripheral surface 102 of capacitor element 100 , with a portion of exterior package 300 interposed between the tip of second extension portion 230 and peripheral surface 102 .

[0087] According to this structure, since the tip of the second extending portion 230 does not come into contact with the peripheral surface 102 , it is possible to prevent the peripheral surface 102 of the capacitor element 100 from being damaged by the second extending portion 230 .

[0088] Furthermore, in capacitor 1 , one surface of exterior body 300 located at a position where connection terminal portion 210 is spaced apart so as to face surface 212 opposite to connection surface 211 serves as casting surface 301 .

[0089] According to this structure, the outer body 300 is formed by a casting method. Even if the connection terminal portion 210 is arranged at the position of the casting surface 301 of the outer body 300, because the connection terminal portion 210 is away from the casting surface 301, the following situation will not occur: the liquid-phase thermosetting resin 3 injected into the casting mold 2 will not flow over the connection surface 211 of the connection terminal portion 210 due to surface tension, manufacturing error, etc. The height of the liquid level 3a will not change. This can prevent the connection between the connection terminal portion 210 and the external terminal 4 caused by the thermosetting resin 3 adhering to the connection surface 211.

[0090] Furthermore, the method for manufacturing capacitor 1 includes: a placement step of placing capacitor module 10, including capacitor element 100 having electrodes 110 on both end surfaces 101 and bus bar 200 connected to electrodes 110, within a casting mold 2 having an opening 2a; an injection step of injecting liquid thermosetting resin 3 through opening 2a into casting mold 2 containing capacitor module 10; and a curing step of heating and curing the thermosetting resin 3 filling casting mold 2 to form an outer casing 300 covering capacitor element 100 and a portion of bus bar 200. Bus bar 200 includes a connecting terminal portion 210, a first extending portion 220, and a second extending portion 230. Connecting terminal portion 210 has a flat connecting surface 211 to which external terminal 4 is connected. The first extension portion 220 and the second extension portion 230 extend from both ends 210a of the connection terminal portion 210 in the first direction, respectively, in a direction intersecting (orthogonal to) the connection surface 211, toward the capacitor element 100. The first extension portion 220 is connected to the electrode 110. During the placement step, the capacitor module 10 is placed within the casting mold 2 with the connection terminal portion 210 facing the opening 2a. During the injection step, thermosetting resin 3 is injected into the casting mold 2 such that the liquid level 3a of the thermosetting resin 3, which serves as the casting surface 301 of the exterior body 300, and the surface 212 of the connection terminal portion 210 opposite the connection surface 211 are spaced apart and face each other, and the tips of the first extension portion 220 and the second extension portion 230 are embedded within the thermosetting resin 3.

[0091] According to this manufacturing method, it is possible to manufacture the capacitor 1 in which the connection operation of the external terminal 4 to the connection terminal portion 210 by welding or the like can be smoothly performed.

[0092] Furthermore, it is possible to manufacture capacitor 1 that can effectively dissipate heat generated by capacitor element 100 when power is supplied to capacitor 1 from connection surface 211 and opposite surface 212 of connection terminal portion 210 .

[0093] Furthermore, it is possible to manufacture the capacitor 1 that can prevent a connection failure between the connection terminal portion 210 and the external terminal 4 caused by the thermosetting resin 3 adhering to the connection surface 211 .

[0094] <Modification Example 1 of Implementation Example 1>

[0095] Figure 4A This is a cross-sectional view of the capacitor 1A according to Modification 1 of the first embodiment, cut parallel to the YZ plane at the position of the pair of bus bars 200A. Figure 4B This is a perspective view of a bus bar 200A according to Modification 1 of Embodiment 1.

[0096] Capacitor 1A of this modification includes a pair of bus bars 200A instead of the pair of bus bars 200 of capacitor 1 of Embodiment 1. Capacitor element 100 and a pair of bus bars 200A form capacitor module 10A. The rest of the structure of capacitor 1A is the same as that of capacitor 1 of Embodiment 1.

[0097] Each bus bar 200A is bent so that the second extension portion 230A approaches the first extension portion 220 along the X-axis direction, which is the first direction, inside the exterior housing 300. The second extension portion 230A extends so that a portion 232 closer to the tip than the bent portion 231 is aligned with (or substantially parallel to) the peripheral surface 102 (flat surface 102a) of the capacitor element 100.

[0098] The rest of the structure of the bus bar 200A is the same as that of the bus bar 200 according to the first embodiment.

[0099] According to the structure of this modified example, even if the second extension portion 230 comes into contact with the peripheral surface 102 (flat surface 102a) due to the precision when forming the outer body 300, the peripheral surface 102 is less likely to be damaged because the surface of the portion 232 near the front end that is opposite to the peripheral surface 102 comes into contact with the peripheral surface 102.

[0100] Furthermore, even if an external force is applied to the connecting terminal portions 210 of the pair of bus bars 200 in a direction moving the connecting terminal portions 210 away from the exterior body 300 , the portions 232 near the distal ends act as resistance, making it difficult to remove the second extending portions 230A from the interior of the exterior body 300 .

[0101] <Modification Example 2 of Implementation Example 1>

[0102] Figure 5A 1 is a cross-sectional view of capacitor 1B according to Modification 2 of Embodiment 1, cut parallel to the YZ plane at the position of a pair of bus bars 400 . Figure 5B This is a perspective view of a bus bar 400 according to Modification 2 of the first embodiment.

[0103] Capacitor 1B of this modification includes a pair of bus bars 400 instead of bus bars 200 of capacitor 1 of Embodiment 1. Capacitor element 100 and bus bars 400 form capacitor module 10B. The remaining structure of capacitor 1B is the same as that of capacitor 1 of Embodiment 1.

[0104] Each bus bar 400 is formed of a conductive material such as copper, and includes a connection terminal portion 410 , a first extension portion 420 , a second extension portion 430 , and a pair of third extension portions 440 .

[0105] The connection terminal portion 210 is formed into a generally square plate shape and has a flat connection surface 411 to which the external terminal 4 is connected. The connection surface 411 faces the positive Z-axis direction. The connection terminal portion 410 is exposed to the outside from the mold surface 301 of the exterior body 300. Furthermore, the connection terminal portion 410 is located away from the mold surface 301, so that a surface 412 opposite the connection surface 411 faces the mold surface 301 of the exterior body 300.

[0106] The first extension portion 420 and the second extension portion 430 are formed in a square plate shape and extend from both ends 410 a of the connection terminal portion 410 in the Y-axis direction toward the negative Z-axis direction perpendicular to the connection surface 411 .

[0107] First extension portion 420 is longer in the Z-axis direction than second extension portion 430. A pin-shaped electrode terminal 421 is formed at the tip of first extension portion 420. The tip of first extension portion 420 is embedded within exterior casing 300 from casting surface 301. Electrode terminal 421 of first extension portion 420 is connected to electrode 110 of capacitor element 100 within exterior casing 300.

[0108] The tip of second extension portion 430 is embedded within exterior casing 300 from mold surface 301 and extends within exterior casing 300 toward peripheral surface 102 (flat surface 102a) of capacitor element 100. The tip of second extension portion 430 does not contact peripheral surface 102; a portion of exterior casing 300 is interposed between the tip of second extension portion 430 and peripheral surface 102.

[0109] The pair of third extensions 440 are each formed in a square plate shape and extend from both ends 410b of the connection terminal portion 410 in the X-axis direction toward the negative Z-axis direction perpendicular to the connection surface 411. The X-axis direction is a second direction orthogonal to the first direction.

[0110] The tip of each third extension portion 440 is embedded within the exterior casing 300 from the mold surface 301 and extends within the exterior casing 300 toward the peripheral surface 102 (flat surface 102a) of the capacitor element 100. The tip of each third extension portion 440 does not contact the peripheral surface 102; a portion of the exterior casing 300 is interposed between the tip of the third extension portion 440 and the peripheral surface 102.

[0111] According to the structure of this modified example, not only are both ends 410a of the connection terminal portion 410 in the first direction supported by the first extension portion 420 and the second extension portion 430 embedded in the exterior body 300, but both ends 410b of the connection terminal portion 410 in the second direction are also embedded in the pair of third extension portions 440 embedded in the exterior body 300. Thus, when the external terminal 4 is pressed against the connection surface 411 of the connection terminal portion 410, the connection terminal portion 410 is securely prevented from moving in the direction of the pressing and in an in-plane direction perpendicular to the direction of the pressing.

[0112] Alternatively, the third extension portion 440 may be provided only at one end 410a in the second direction of the connection terminal portion 410. In this case, compared to a structure in which only the two ends 410a in the first direction of the connection terminal portion 410 are supported by the first extension portion 420 and the second extension portion 430, movement of the connection terminal portion 410 when the external terminal 4 is pressed can be more firmly suppressed.

[0113] <Modification 3 of Implementation Example 1>

[0114] Figure 6A 1 is a cross-sectional view of the capacitor 1C according to Modification 3 of the first embodiment, cut parallel to the YZ plane at the position of the pair of bus bars 400A. Figure 6B This is a perspective view of a bus bar 400A according to Modification 3 of the first embodiment.

[0115] Capacitor 1C of this modification includes a pair of bus bars 400A instead of the pair of bus bars 400 of capacitor 1B of Modification 2 of Embodiment 1. Capacitor element 100 and a pair of bus bars 400A form a capacitor module 10C. The remaining structure of capacitor 1C is the same as that of capacitor 1B of Modification 2 of Embodiment 1.

[0116] Each bus bar 400A is bent so that the second extension portion 430A approaches the first extension portion 420 along the X-axis direction, which is the first direction, inside the exterior housing 300. The second extension portion 430A extends so that a portion 432 closer to the tip than the bent portion 431 is aligned with (or substantially parallel to) the peripheral surface 102 (flat surface 102a) of the capacitor element 100.

[0117] The rest of the structure of the bus bar 400A is the same as that of the bus bar 400 according to the second modification of the first embodiment described above.

[0118] According to the structure of this modified example, even if the second extension portion 430A comes into contact with the peripheral surface 102 (flat surface 102a), the peripheral surface 102 is less likely to be damaged. Furthermore, even if an external force is applied to the connecting terminal portions 410 of the pair of bus bars 400A in a direction moving the connecting terminal portions 410 away from the exterior body 300, the second extension portion 430A is less likely to be pulled out from the interior of the exterior body 300.

[0119] <Modification 4 of Implementation Example 1>

[0120] Figure 7A 1 is a cross-sectional view of a capacitor 1D according to Modification 4 of the first embodiment, cut parallel to the XZ plane at the position of a pair of bus bars 400B. Figure 7B This is a diagram of a bus bar 400B according to Modification 4 of the first embodiment as viewed in the positive Y-axis direction.

[0121] Capacitor 1D of this modification includes a pair of bus bars 400B instead of the pair of bus bars 400A of capacitor 1C of Modification 3 of Embodiment 1. Capacitor element 100 and a pair of bus bars 400B form a capacitor module 10D. The remaining structure of capacitor 1D is the same as that of capacitor 1C of Modification 3 of Embodiment 1.

[0122] Each bus bar 400B is bent so that a pair of third extension portions 440B approach each other along the X-axis, which serves as the second direction, within the exterior housing 300. Each third extension portion 440B extends so that a portion 442 closer to the tip than the bent portion 441 is aligned with (or substantially parallel to) the peripheral surface 102 (flat surface 102a) of the capacitor element 100.

[0123] The rest of the structure of the bus bar 400B is the same as that of the bus bar 400A according to the third modification of the first embodiment.

[0124] According to the structure of this modified example, even if the third extension portion 440B comes into contact with the peripheral surface 102 (flat surface 102a), the peripheral surface 102 is less likely to be damaged. Furthermore, even if an external force is applied to the connecting terminal portions 410 of the pair of bus bars 400B in a direction away from the exterior body 300, the third extension portion 440B is less likely to be pulled out from the interior of the exterior body 300.

[0125] <Modification 5 of Implementation Example 1>

[0126] Figure 8A It is a perspective view of a capacitor 1E according to a fifth modification of the first embodiment. Figure 8B This is a perspective view of a capacitor module 10E according to Modification 5 of the first embodiment.

[0127] The capacitor 1E of this modified example includes a capacitor element 100, a pair of bus bars 500, and an exterior body 300. The capacitor element 100 and the pair of bus bars 500 form a capacitor module 10E.

[0128] The pair of bus bars 500 includes a connection terminal portion 510 having a flat connection surface 511, a first extension portion 520 having a pair of electrode terminals 521, and a second extension portion 530. Compared to the pair of bus bars 200 of Embodiment 1, the pair of bus bars 500 has a larger dimension in the X-axis direction (the second direction). The X-axis dimension of each connection terminal portion 510 is set to be at least half the X-axis dimension of the molding surface 301 of the exterior body 300, and each connection terminal portion 510 extends to near both ends of the molding surface 301 in the X-axis direction.

[0129] A pair of bus bars 500 are arranged along the Y-axis (first direction). In the direction in which capacitor elements 100 and connection terminal portions 510 are arranged (the Z-axis), the connection surfaces 511 of the connection terminal portions 510 of each bus bar 500 are positioned in the same direction. Furthermore, each connection surface 511 is parallel (or substantially parallel) to the surface 302 of the exterior body 300 opposite to the molding surface 301 (the surface on the negative Z-axis side).

[0130] In the capacitor 1E of this modified example, each connection terminal portion 510 of the pair of bus bars 500 has a structure that is elongated in a direction (a second direction) perpendicular to the direction (a first direction) in which the pair of bus bars 500 are arranged. Therefore, when the capacitor 1E is fixed to the external device 5 using the fixing member 6, a portion of the flat connection surface 511 of each connection terminal portion 510 can be used as a mounting surface for the fixing member 6.

[0131] Figure 9A 1 is a plan view showing a state where the capacitor 1E is fixed to the external device 5 using the fixing member 6 according to the fifth modification of the first embodiment. Figure 9B yes Figure 9A A-A' cross-sectional view. In addition, Figure 9A In the figure, the screw 7 is omitted for convenience.

[0132] The external device 5 includes, for example, a housing 51 with an open top. In the housing 51, mounting bosses 52 each having screw holes 52a are provided on both side surfaces 51a in the Y-axis direction.

[0133] A predetermined number of one or more, for example, three capacitors 1E are arranged along the direction (Y-axis direction) in which the pair of bus bars 500 are arranged, and are housed in the case 51 .

[0134] The fixing member 6 has a rectangular flat plate shape, for example, that is longer than the three capacitors 1E connected in the direction (Y-axis direction) in which the pair of busbars 500 are arranged. Mounting members 61 having through holes 61 a are formed at both ends of the fixing member 6 .

[0135] The fixing member 6 is provided in a portion of the connection surface 511 of each of the connection terminal portions 510 of the three capacitors 1E, for example, in the area on the negative side of the X-axis. As a result, the three capacitors 1E are sandwiched between the fixing member 6 and the bottom portion 51b of the housing 51. The through-holes 61a of the two mounting assemblies 61 of the fixing member 6 mate with the screw holes 52a of the two mounting bosses 52 of the housing 51. Screws 7 passing through the through-holes 61a are tightened in the screw holes 52a. In this manner, the three capacitors 1E are secured to the housing 51, i.e., the external device 5.

[0136] When the fixing member 6 is formed of an insulating material, it is directly provided on the connection surface 511 of each connection terminal portion 510. On the other hand, when the fixing member 6 is formed of a non-insulating (conductive) material, it is provided on the connection surface 511 of each connection terminal portion 510 via an insulating member such as insulating paper.

[0137] In each connection terminal portion 510 of the three capacitors 1E, an external terminal 4 of the external device 5 is connected to a region of the connection surface 511 where the fixing member 6 is not provided.

[0138] In the capacitor 1E of this modification, the fixing member 6 can be provided on the flat connection surface 511 of the connection terminal portion 510. Therefore, play between the fixing member 6 and the capacitor 1E is less likely to occur. Therefore, the fixing member 6 can securely fix the capacitor 1E to the external device 5.

[0139] Furthermore, unlike capacitor 1E, in a configuration where a portion of the connection surface 511 of each connecting terminal portion 510 of a pair of busbars 500 cannot be used as a mounting surface for the fixing member 6, a portion of the casting surface 301 of the exterior body 300 can be used as a mounting surface for the fixing member 6. However, the edge of the casting surface 301 where it meets the mold box 2 is prone to bulging due to surface tension, and is generally difficult to achieve a flat surface. Therefore, if the fixing member 6 is placed on the casting surface 301, there is a risk that the fixing member 6 will not securely secure the capacitor to the external device 5.

[0140] <Other Modifications of Implementation Example 1>

[0141] The pair of bus bars 200 in the first embodiment may also be changed to Figure 10A 、 Figure 10B Such a structure. That is, Figure 10A As shown, the dimension of the second extension portion 230 in the X-axis direction (the second direction) may also be smaller than the dimension of the connection terminal portion 210 in the same direction. Figure 10A As shown by the dotted line, the dimension of the second extension portion 230 in the X-axis direction may be larger than the dimension of the connection terminal portion 210 in the same direction. Figure 10A A single dot-dashed line creates a gap like this.

[0142] Furthermore, if Figure 10B As shown, the second extension portion 230 may also be composed of a first portion 230a on the side of the first extension portion 220 having a relatively smaller dimension in the X-axis direction (the second direction), and a second portion 230b on the side opposite to the first extension portion 220 having a relatively larger dimension in the X-axis direction. In this structure, even if an external force is applied to the connection terminal portion 210 in a direction moving the connection terminal portion 210 away from the exterior body 300, the second portion 230b acts as resistance, making it difficult for the second extension portion 230 to be removed from the interior of the exterior body 300.

[0143] In the pair of bus bars 400 of the second modification of the first embodiment, at least one of the second extension portion 430 and the third extension portion 440 may be modified to be the same as Figure 10A 、 Figure 10B Same structure.

[0144] Furthermore, the pair of bus bars 200A of the modification 1 of the above-mentioned embodiment 1 may be modified to Figure 10C 、 Figure 10D Such a structure. That is, Figure 10C As shown, the second extension portion 230A may also be configured such that a portion 232 closer to the front end than the bent portion 231 extends with a distance from the peripheral surface 102 (flat surface 102a) of the capacitor element 100 increasing (moving away) as it moves toward the front end. Figure 10D As shown, the second extension portion 230A may be bent away from the first extension portion 220 in the X-axis direction (first direction). Figure 10D As shown by the dotted line, the portion 232 near the front end may also extend with the distance from the peripheral surface 102 increasing (getting farther away) as it moves toward the front end. Figure 10C 、 Figure 10D The second extending portion 230A shown can also achieve the same effects as the first modification of the above-described first embodiment.

[0145] In the pair of bus bars 400A of the modification 3 of the above-mentioned embodiment 1, the second extension portion 430A may be modified to be Figure 10C 、 Figure 10DFurthermore, in the pair of bus bars 400B of the modification 4 of the above-mentioned embodiment 1, at least one of the second extension portion 430A and the third extension portion 440B may be changed to Figure 10C 、 Figure 10D Same structure.

[0146] Furthermore, the first extension portions 220 of the pair of bus bars 200 in the first embodiment and the first extension portions 420 of the pair of bus bars 400 in the second modification of the first embodiment may be formed in the same shape as the first extension portions 620 of the pair of bus bars 600 in the second embodiment described below.

[0147] Furthermore, in the modified examples 1, 3 and 4 of the above-mentioned embodiment 1, the portions 232, 432, 442 closer to the front end than the bent portions 231, 431, 441 of the second extension portions 230A, 430A and the third extension portion 440B may not be linear but may be slightly warped toward the peripheral surface 102 of the capacitor element 100.

[0148] Furthermore, the configuration of any of the first to fourth modifications of the first embodiment, the configuration of other modifications of the first embodiment, and the configuration of the fifth modification of the first embodiment can be combined as appropriate.

[0149] <Implementation Method 2>

[0150] Embodiment 2 is an embodiment of a method for manufacturing a capacitor according to the second aspect of the present invention and a capacitor according to the fourth aspect of the present invention.

[0151] Figure 11A 1F according to the second embodiment is a diagram showing the capacitor 1F viewed in the negative direction of the Z axis. Figure 11B This is a diagram of the capacitor 1F according to the second embodiment as viewed in the negative direction of the X axis. Figure 12A as well as Figure 12B They are respectively involved in implementation mode 2 Figure 11A BB' and C-C' cross-sectional views. Figure 13 This is an exploded perspective view of a capacitor module 10F according to the second embodiment.

[0152] Capacitor 1F includes capacitor element 100, a pair of bus bars 600, and an exterior body 300. Capacitor element 100 and a pair of bus bars 600 are connected to form capacitor module 10F. In capacitor 1F, the structure of the pair of bus bars 600 differs from the structure of the pair of bus bars 200 in capacitor 1 of the first embodiment.

[0153] The pair of bus bars 600 are formed of a conductive material such as copper, and include a connection terminal portion 610 , a first extension portion 620 , and a pair of second extension portions 630 .

[0154] The connection terminal portion 610 is formed in a generally square plate shape and has a flat connection surface 611 to which the external terminal 4 is connected. The connection surface 611 faces the positive Z-axis direction. The connection terminal portion 610 is exposed to the outside from the mold surface 301 of the exterior body 300. Furthermore, the connection terminal portion 610 is located away from the mold surface 301, so that a surface 612 opposite the connection surface 611 faces the mold surface 301 of the exterior body 300.

[0155] The first extension portion 620 is formed in a square plate shape and extends from one end 610a of the connection terminal portion 610 in the Y-axis direction toward the negative Z-axis direction perpendicular to the connection surface 611. The Y-axis direction is the first direction. In this embodiment, the first direction is perpendicular to the end surface 101 of the capacitor element 100.

[0156] The first extension portion 620 is composed of a first portion 621, which is located on the side closest to the connection terminal portion 610 and has a square plate shape, and a second portion 622, which is located farther from the connection terminal portion 610 than the first portion 621 and has a larger square plate shape than the first portion 621. A substantially square opening 623 is formed in the second portion 622. A pin-shaped electrode terminal 624 is formed at the end edge of the opening 623 on the positive Z-axis side.

[0157] In first extending portion 620 , a portion near the tip (part of first portion 621 and second portion 622 ) is embedded in exterior body 300 , and electrode terminal 624 is connected to electrode 110 of capacitor element 100 inside exterior body 300 .

[0158] The pair of second extensions 630 are formed in a square plate shape and extend from both ends 610b of the connection terminal portion 610 in the X-axis direction in the negative Z-axis direction perpendicular to the connection surface 611. The X-axis direction is a second direction orthogonal to the first direction.

[0159] The tip of each second extension portion 630 is embedded within the exterior casing 300 from the mold surface 301 and extends within the exterior casing 300 toward the peripheral surface 102 (flat surface 102a) of the capacitor element 100. The tip of the second extension portion 630 does not contact the peripheral surface 102; a portion of the exterior casing 300 is interposed between the tip of the second extension portion 630 and the peripheral surface 102.

[0160] In the capacitor 1F of this embodiment, the outer casing 300 is also the same as the capacitor 1 of the above-mentioned embodiment 1. Figures 3A to 3CThe mold is formed by the casting method using the mold box 2 described above.

[0161] That is, the process of forming the outer casing 300 includes: a setting process of setting the capacitor module 10F in a casting mold 2 having an opening portion 2a; an injection process of injecting a liquid-phase thermosetting resin 3 from the opening portion 2a into the casting mold 2 in which the capacitor module 10F is set; and a curing process of heating and curing the thermosetting resin 3 filling the casting mold 2 to form an outer casing 300 covering the capacitor module 10F.

[0162] In the installation step, the capacitor module 10F is installed in the casting mold flask 2 in a posture where the connection terminal portion 610 faces the opening 2 a side.

[0163] During the injection process, thermosetting resin 3 is injected into the casting mold 2 so that the liquid surface 3a of the thermosetting resin 3 which becomes the casting surface 301 of the outer body 300 and the surface 612 of the connecting terminal portion 610 on the opposite side of the connecting surface 611 are separated and opposite to each other, and the front end portions of the first extension portion 620 and a pair of second extension portions 630 are buried in the interior of the thermosetting resin 3.

[0164] When the capacitor 1F is installed in an external device such as an inverter device, one of the pair of bus bars 600 becomes a positive bus bar (P-pole bus bar) and the other becomes a negative bus bar (N-pole bus bar). Figure 11B As shown, the positive (P-pole) and negative (N-pole) external terminals 4 are connected to the respective connection terminal portions 610 of the pair of bus bars 600 by welding such as laser welding or resistance welding.

[0165] <Effects of Implementation Method 2>

[0166] As described above, according to this embodiment, the following effects are achieved.

[0167] Capacitor 1F includes a capacitor element 100 having electrodes 110 on both end surfaces 101; a busbar 600 connected to the electrodes 110; and an exterior casing 300 formed of a thermosetting resin 3 and covering the capacitor element 100 and a portion of the busbar 600. Busbar 600 includes a connecting terminal portion 610, a first extending portion 620, and a second extending portion 630. Connecting terminal portion 610 has a flat connecting surface 611 to which external terminal 4 is connected, and is exposed from exterior casing 300. A surface 612 of connecting terminal portion 610 opposite connecting surface 611 is located away from one surface of exterior casing 300, facing the surface. First extending portion 620 extends from end 610a of connecting terminal portion 610 in the first direction (Y-axis direction) in a direction intersecting (orthogonal to) connecting surface 611 and is embedded within exterior casing 300. The second extension portion 630 extends from both ends 610b of the connection terminal portion 610 in a second direction (the X-axis direction) perpendicular to the first direction, in a direction (perpendicular direction) intersecting the connection surface 611, and is embedded in the interior of the exterior body 300. The first extension portion 620 is connected to the electrode 110 within the interior of the exterior body 300.

[0168] According to this structure, since both ends 610b of the connecting terminal portion 610 in the second direction are supported by the pair of second extension portions 630 embedded in the exterior body 300, during the connection operation of the external terminal 4 to the connecting terminal portion 610 by welding or the like, even if the external terminal 4 is pressed against the connection surface 611 of the connecting terminal portion 610, the connecting terminal portion 610 is unlikely to move in the direction of the pressing or in a direction perpendicular to the direction of the pressing. Therefore, since the connecting terminal portion 610 can be held by a separate fixture, the time and effort of setting up a fixture are eliminated, and the connection operation can be performed smoothly.

[0169] Furthermore, in connection terminal portion 610, surface 612 opposite connection surface 611 is spaced apart from the surface of exterior body 300 where connection terminal portion 610 is exposed. This allows heat generated by capacitor element 100 when power is supplied to capacitor 1F to be effectively dissipated from both surfaces 611 and 612 of connection terminal portion 610.

[0170] Furthermore, in capacitor 1F, second extension portion 630 extends inside exterior package 300 toward peripheral surface 102 of capacitor element 100 , with a portion of exterior package 300 interposed between the tip of second extension portion 630 and peripheral surface 102 .

[0171] According to this structure, it is possible to prevent peripheral surface 102 of capacitor element 100 from being damaged by each second extending portion 630 .

[0172] Furthermore, in capacitor 1F, one surface of exterior body 300 located at a position spaced apart from and facing surface 612 of connection terminal portion 610 opposite to connection surface 611 thereof serves as molding surface 301 .

[0173] According to this structure, the outer body 300 is formed by a casting method, and even if the connecting terminal portion 610 is arranged at the position of the casting surface 301 of the outer body 300, poor connection between the connecting terminal portion 610 and the external terminal 4 due to the thermosetting resin 3 attached to the connecting surface 611 can be prevented.

[0174] Furthermore, according to the method for manufacturing the capacitor 1F, it is possible to manufacture the capacitor 1F in which the connection operation of the external terminal 4 to the connection terminal portion 610 by welding or the like can be smoothly performed.

[0175] Furthermore, it is possible to manufacture a capacitor 1F that can effectively dissipate heat generated by the capacitor element 100 when current is supplied to the capacitor 1F from the connection surface 611 and the opposite surface 612 of the connection terminal portion 610 .

[0176] Furthermore, it is possible to manufacture a capacitor 1F capable of preventing a connection failure between the connection terminal portion 610 and the external terminal 4 caused by the thermosetting resin 3 adhering to the connection surface 611 .

[0177] <Modification Example 1 of Implementation Example 2>

[0178] Figure 14A FIG. 6 is a diagram showing the bus bar 600A according to Modification 1 of Embodiment 2 viewed in the positive direction of the Y axis. Figure 14A In FIG. 1 , for convenience, a portion of the peripheral surface 102 (flat surface 102 a ) of the capacitor element 100 is depicted by a dashed line.

[0179] The capacitor 1F may include a pair of bus bars 600A instead of the pair of bus bars 600 .

[0180] Each bus bar 600A is bent so that a pair of second extension portions 630A approach each other along the X-axis, which serves as a second direction, within the exterior housing 300. Each second extension portion 630A extends so that a portion 632 closer to the tip than the bent portion 631 is aligned with (or substantially parallel to) the peripheral surface 102 of the capacitor element 100.

[0181] like Figure 14A As shown by the dotted line, the second extending portion 630A may be configured such that a portion 632 closer to the front end than the bent portion 631 extends with a distance from the peripheral surface 102 of the capacitor element 100 increasing (getting farther away) toward the front end.

[0182] The rest of the structure of the bus bar 600A is the same as that of the bus bar 600 in the second embodiment.

[0183] According to the structure of this modified example, even if the pair of second extensions 630A come into contact with the peripheral surface 102, the peripheral surface 102 is less likely to be damaged. Furthermore, even if an external force is applied to the connection terminal portions 610 of the pair of bus bars 600A in a direction away from the exterior body 300, the pair of second extensions 630A is less likely to be pulled out from the interior of the exterior body 300.

[0184] <Modification Example 2 of Implementation Example 2>

[0185] Figure 14B FIG. 6 is a diagram showing a bus bar 600B according to a second modification of the second embodiment when viewed in the positive direction of the Y axis. Figure 14B In FIG. 1 , for convenience, a portion of the peripheral surface 102 (flat surface 102 a ) of the capacitor element 100 is depicted by a dashed line.

[0186] The capacitor 1F may include a pair of bus bars 600B instead of the pair of bus bars 600 .

[0187] Each bus bar 600B is bent so that the pair of second extension portions 630B are spaced apart from each other along the X-axis, which serves as a second direction, within the exterior housing 300. Each second extension portion 630B extends so that a portion 632 closer to the tip than the bent portion 631 is aligned with (or substantially parallel to) the peripheral surface 102 of the capacitor element 100.

[0188] like Figure 14B As shown by the dotted line, the second extension portion 630B may be configured such that a portion 632 closer to the front end than the bent portion 631 extends with a distance from the peripheral surface 102 of the capacitor element 100 increasing (getting farther away) toward the front end.

[0189] The rest of the structure of the bus bar 600B is the same as that of the bus bar 600 in the second embodiment.

[0190] According to the configuration of this modification, the same effects as those of the modification 1 of the above-described second embodiment can be achieved.

[0191] <Modification 3 of Implementation Example 2>

[0192] Figure 15A FIG. 1 is a diagram showing capacitor 1G according to Modification 3 of Embodiment 2 viewed in the negative direction of the Z axis. Figure 15B This is a diagram of a capacitor 1G according to the second embodiment, in which a fixing member 6 is provided, as viewed in the negative direction of the X axis.

[0193] The capacitor 1G of this modification example includes a pair of bus bars 700. The capacitor element 100 and the pair of bus bars 700 constitute a capacitor module 10G.

[0194] The pair of bus bars 700 includes a connecting terminal portion 710 having a flat connecting surface 711, a first extending portion 720, and a second extending portion 730. Compared to the pair of bus bars 600 of Embodiment 2, the pair of bus bars 700 has a larger dimension in the X-axis direction (the second direction). The dimension of each connecting terminal portion 710 in the X-axis direction is set to be at least half the dimension of the casting surface 301 of the exterior body 300 in the X-axis direction, and each connecting terminal portion 710 extends to near both ends of the casting surface 301 in the X-axis direction.

[0195] The pair of bus bars 700 are arranged along the Y-axis (first direction). In the Z-axis, the direction in which the capacitor element 100 and the pair of bus bars 700 are arranged, the connection surfaces 711 of the connection terminal portions 710 of the pair of bus bars 700 are aligned. Furthermore, the two connection surfaces 711 are parallel (or substantially parallel) to the surface 302 of the exterior body 300 opposite the casting surface 301 (the surface on the negative Z-axis side).

[0196] In the capacitor 1G of this modification, similar to the capacitor 1E of the fifth modification of the first embodiment, when the capacitor 1G is fixed to the external device 5 using the fixing member 6, a portion of the flat connection surface 711 of each connection terminal portion 710 can be used as a mounting surface for the fixing member 6. Therefore, the capacitor 1G can be firmly fixed to the external device 5 by the fixing member 6.

[0197] <Other Modifications of Implementation Example 2>

[0198] In the pair of bus bars 600 of the second embodiment, the first extension portion 620 may be formed in the same shape as the first extension portion 220 of the pair of bus bars 200 of the first embodiment and the first extension portion 420 of the pair of bus bars 400 of the second modification of the first embodiment. Figure 10A 、 Figure 10B Same structure.

[0199] <Other Changes>

[0200] In the first and second embodiments described above, capacitor element 100 is positioned within exterior housing 300 such that flat surface 102a of peripheral surface 102 faces toward mold surface 301 of exterior housing 300. However, capacitor element 100 may also be positioned within exterior housing 300 such that curved surface 102b of peripheral surface 102 faces toward mold surface 301 of exterior housing 300. In this case, for example, in a pair of bus bars 200, second extension portion 230 extends toward curved surface 102b within exterior housing 300. Furthermore, in a pair of bus bars 600, second extension portion 630 extends toward curved surface 102b within exterior housing 300.

[0201] Furthermore, in the above-mentioned embodiments 1 and 2, the capacitors 1 and 1F include a single capacitor element 100. However, the number of capacitor elements 100 is not limited to one and may be two or more. In this case, the capacitor may be configured such that a single exterior body covers multiple capacitor modules. Alternatively, the capacitor may be configured such that an exterior body covers a single capacitor module formed by connecting a pair of busbars to multiple capacitor elements.

[0202] Furthermore, in the above-described first and second embodiments, the exterior body 300 is formed by casting using the casting mold 2. However, the exterior body 300 may also be formed by molding using a mold. In this case, since the exterior body 300 does not have a casting surface 301, the surface of the exterior body 300 where the connection terminal portions 210, 610 of the pair of bus bars 200, 600 are exposed does not serve as the casting surface 301.

[0203] Furthermore, in the above-mentioned first and second embodiments, two metallized films having aluminum vapor-deposited on a dielectric film are overlapped, and the overlapped metallized films are wound or stacked to form capacitor element 100. Alternatively, these capacitor elements 100 may be formed by overlapping a metallized film having aluminum vapor-deposited on both sides of a dielectric film and an insulating film, and then winding or stacking the two films.

[0204] Furthermore, in the above-described first and second embodiments, capacitors 1 and 1F are caseless capacitors. However, the present invention is also applicable to case-molded capacitors. Case-molded capacitors include a case that houses the capacitor element, and the case is filled with a thermosetting resin and cured to form an exterior body within the case.

[0205] Furthermore, in the above-mentioned Embodiments 1 and 2, the capacitors 1 and 1F are thin film capacitors. However, the capacitors 1 and 1F may be capacitors other than thin film capacitors.

[0206] Furthermore, various modifications can be appropriately made to the embodiments of the present invention within the scope of the technical concept shown in the claims.

[0207] (Note)

[0208] The following techniques are disclosed through the description of the above embodiments.

[0209] (Technique 1)

[0210] A capacitor comprising:

[0211] A capacitor element having electrodes at both end surfaces;

[0212] a bus bar connected to the electrodes; and

[0213] an outer casing formed of resin and covering the capacitor element and a portion of the bus bar;

[0214] The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion.

[0215] The connecting terminal portion has a flat connecting surface to which an external terminal is connected and is exposed from the outer casing.

[0216] The surface of the connection terminal portion opposite to the connection surface is located away from the one surface so as to face the one surface of the exterior body.

[0217] The first extension portion and the second extension portion extend from both ends of the connection terminal portion in the first direction in a direction intersecting the connection surface and are embedded in the interior of the outer body.

[0218] The first extension portion is connected to the electrode inside the exterior body.

[0219] According to this technology, when connecting the external terminal to the connection terminal portion by welding or the like, it is not necessary to use a separate jig to hold the connection terminal portion. Therefore, the connection operation can be performed smoothly without the trouble of setting up a jig.

[0220] Furthermore, heat generated by the capacitor element when current is supplied to the capacitor can be effectively dissipated from both surfaces of the connection terminal portion.

[0221] (Technique 2)

[0222] In the capacitor described in Technique 1,

[0223] The second extension portion extends inside the outer casing toward the peripheral surface of the capacitor element.

[0224] A portion of the exterior body is interposed between the front end of the second extending portion and the peripheral surface.

[0225] According to this technique, it is possible to prevent the peripheral surface of the capacitor element from being damaged by the second extending portion.

[0226] (Technique 3)

[0227] In the capacitor described in Technique 2,

[0228] The second extension portion is bent in the first direction at a bent portion inside the outer body.

[0229] A portion of the second extending portion closer to the front end than the bent portion extends parallel to the peripheral surface, or extends such that a distance from the peripheral surface increases toward the front end.

[0230] According to this technique, even if the second extending portion comes into contact with the peripheral surface, the peripheral surface is less likely to be damaged.

[0231] (Technique 4)

[0232] In the capacitor described in any one of techniques 1 to 3,

[0233] The bus bar further includes a third extension portion,

[0234] The third extending portion extends from an end of the connecting terminal portion in a second direction perpendicular to the first direction in a direction intersecting the connecting surface and is embedded in the exterior body.

[0235] According to this technology, when the external terminal is pressed against the connection surface of the connection terminal portion, the connection terminal portion can be firmly prevented from moving in the pressed direction and in the in-plane direction perpendicular to the pressed direction.

[0236] (Technique 5)

[0237] In the capacitor described in Technique 4,

[0238] The third extension portion is bent in the second direction at a bent portion inside the outer body.

[0239] A portion of the third extending portion closer to the front end than the bent portion extends parallel to the peripheral surface, or extends such that a distance from the peripheral surface increases toward the front end.

[0240] According to this technology, even if a situation occurs in which the third extending portion contacts the peripheral surface, the peripheral surface is less likely to be damaged.

[0241] (Technique 6)

[0242] A capacitor comprising:

[0243] A capacitor element having electrodes at both end surfaces;

[0244] a bus bar connected to the electrodes; and

[0245] an outer casing formed of resin and covering the capacitor element and a portion of the bus bar;

[0246] The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion.

[0247] The connecting terminal portion has a flat connecting surface to which an external terminal is connected and is exposed from the outer casing.

[0248] The surface of the connection terminal portion opposite to the connection surface is located away from the one surface so as to face the one surface of the exterior body.

[0249] The first extension portion extends from the end of the connection terminal portion in the first direction in a direction intersecting the connection surface and is embedded in the interior of the exterior body.

[0250] The second extension portion extends from both ends of the connection terminal portion in a second direction perpendicular to the first direction in a direction intersecting the connection surface and is embedded in the interior of the exterior body.

[0251] The first extension portion is connected to the electrode inside the exterior body.

[0252] According to this technology, when connecting the external terminal to the connection terminal portion by welding or the like, it is not necessary to use a separate jig to hold the connection terminal portion. Therefore, the connection operation can be performed smoothly without the trouble of setting up a jig.

[0253] Furthermore, heat generated by the capacitor element when current is supplied to the capacitor can be effectively dissipated from both surfaces of the connection terminal portion.

[0254] (Technique 7)

[0255] In the capacitor described in Technique 6,

[0256] The second extension portion extends inside the outer casing toward the peripheral surface of the capacitor element.

[0257] A portion of the exterior body is interposed between the front end of the second extending portion and the peripheral surface.

[0258] According to this technique, it is possible to prevent the peripheral surface of the capacitor element from being damaged by the second extending portion.

[0259] (Technique 8)

[0260] In the capacitor described in Technology 7,

[0261] The second extension portion is bent in the second direction at a bent portion inside the outer body.

[0262] A portion of the second extending portion closer to the front end than the bent portion extends parallel to the peripheral surface, or extends such that a distance from the peripheral surface increases toward the front end.

[0263] According to this technique, even if a situation occurs in which each second extending portion comes into contact with the peripheral surface, the peripheral surface is less likely to be damaged.

[0264] (Technique 9)

[0265] In the capacitor described in any one of techniques 1 to 8,

[0266] One side of the outer casing is a casting surface.

[0267] According to this technology, the outer body is formed by a casting method. Even if the connection terminal portion is arranged at a position on the casting surface of the outer body, poor connection between the connection terminal portion and the external terminal due to thermosetting resin adhering to the connection surface can be prevented.

[0268] (Technology 10)

[0269] In the capacitor described in Technology 9,

[0270] The bus bars are arranged along the first direction,

[0271] A dimension of the connection terminal portion in a second direction perpendicular to the first direction is equal to or greater than half a dimension of the casting surface in the second direction.

[0272] According to this technology, when the capacitor is fixed to an external device using a fixing member, a portion of the flat connection surface of each connection terminal portion can be used as a mounting surface for the fixing member.

[0273] (Technology 11)

[0274] A method for manufacturing a capacitor, comprising:

[0275] A setting step of setting a capacitor module including a capacitor element having electrodes on both end surfaces and a bus bar connected to the electrodes in a casting mold having an opening;

[0276] an injection step of injecting a thermosetting resin in a liquid phase from the opening into the casting mold box in which the capacitor module is installed; and

[0277] a curing step of heating and curing the thermosetting resin filled in the casting mold to form an outer casing covering the capacitor element and a portion of the bus bar;

[0278] The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion.

[0279] The connecting terminal portion has a flat connecting surface to which an external terminal is connected.

[0280] The first extension portion and the second extension portion extend from both ends of the connection terminal portion in the first direction toward the capacitor element in a direction intersecting the connection surface.

[0281] The first extension portion is connected to the electrode,

[0282] In the setting step, the capacitor module is set in the casting mold box with the connection terminal portion facing the opening portion.

[0283] In the injection process, the thermosetting resin is injected into the casting mold box so that the liquid surface of the thermosetting resin which becomes the casting surface of the outer body and the surface of the connecting terminal portion opposite to the connecting surface are separated and opposite to each other, and the front end of the first extension portion and the front end of the second extension portion are buried in the interior of the thermosetting resin.

[0284] (Technology 12)

[0285] A method for manufacturing a capacitor, comprising:

[0286] A setting step of setting a capacitor module including a capacitor element having electrodes on both end surfaces and a bus bar connected to the electrodes in a casting mold having an opening;

[0287] an injection step of injecting a thermosetting resin in a liquid phase from the opening into the casting mold box in which the capacitor module is installed; and

[0288] a curing step of heating and curing the thermosetting resin filled in the casting mold to form an outer casing covering the capacitor element and a portion of the bus bar;

[0289] The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion.

[0290] The connecting terminal portion has a flat connecting surface to which an external terminal is connected.

[0291] The first extension portion extends from an end of the connection terminal portion in the first direction toward the capacitor element in a direction intersecting the connection surface and is connected to the electrode.

[0292] The second extension portion extends from both ends of the connection terminal portion in a second direction perpendicular to the first direction toward the capacitor element along a direction intersecting the connection surface.

[0293] In the setting step, the capacitor module is set in the casting mold box with the connection terminal portion facing the opening portion.

[0294] In the injection process, the thermosetting resin is injected into the casting mold box so that the liquid surface of the thermosetting resin which becomes the casting surface of the outer body and the surface of the connecting terminal portion opposite to the connecting surface are separated and opposite to each other, and the front end of the first extension portion and the front end of the second extension portion are buried in the interior of the thermosetting resin.

[0295] According to these techniques 11 and 12, a capacitor can be manufactured in which the connection operation of the external terminal to the connection terminal portion by welding or the like can be smoothly performed.

[0296] Furthermore, it is possible to manufacture a capacitor capable of effectively dissipating heat generated by the capacitor element when current is supplied to the capacitor from both surfaces of the connection terminal portion.

[0297] Furthermore, it is possible to manufacture a capacitor capable of preventing connection failure between the connection terminal portion and the external terminal caused by the thermosetting resin adhering to the connection surface.

[0298] Industrial applicability

[0299] The present invention is useful for capacitors used in various electronic devices, electrical equipment, industrial equipment, vehicle electrical components, and the like.

[0300] -Explanation of symbols-

[0301] 1. 1A~1G capacitor

[0302] 2. Mold box for casting

[0303] 2a Opening

[0304] 3 Thermosetting resin (resin)

[0305] 3a Liquid level

[0306] 4 external terminals

[0307] 10, 10A~10G capacitor module

[0308] 100 capacitor elements

[0309] 101 end face

[0310] 102 Circumference

[0311] 110 electrodes

[0312] 200, 200A, 400, 400A, 400B, 500 busbars

[0313] 210, 410, 510 connection terminal

[0314] 210a, 410a terminals

[0315] 210b, 410b ports

[0316] 211, 411, 511 connection surface

[0317] 212, 412 opposite side

[0318] 220, 420 1st extension

[0319] 230, 230A, 430, 430A, 430B Second extension

[0320] 231, 431 bending part

[0321] 232, 432 near the front end

[0322] 300 outer body

[0323] 301 casting surface

[0324] 440, 440B Third Extension

[0325] 600, 600A, 600B, 700 busbars

[0326] 610, 710 connection terminal part

[0327] 610a, end

[0328] 610b, end

[0329] 611, 711 connection surface

[0330] 612 opposite side

[0331] 620, 720 First Extension

[0332] 630, 730 Second Extension

[0333] 631 bending part

[0334] 632 near the front end.

Claims

1. A capacitor comprising: A capacitor element having electrodes at both end surfaces; a bus bar connected to the electrodes; and an outer casing formed of resin and covering the capacitor element and a portion of the bus bar; The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected and is exposed from the outer casing. The surface of the connection terminal portion opposite to the connection surface is located away from the one surface so as to face the one surface of the exterior body. The first extension portion and the second extension portion extend from both ends of the connection terminal portion in the first direction in a direction intersecting the connection surface and are embedded in the interior of the outer body. The first extension portion is connected to the electrode inside the exterior body.

2. The capacitor according to claim 1, wherein The second extension portion extends inside the outer casing toward the peripheral surface of the capacitor element. A portion of the exterior body is interposed between the front end of the second extending portion and the peripheral surface.

3. The capacitor according to claim 2, wherein The second extension portion is bent in the first direction at a bent portion inside the outer body. A portion of the second extending portion closer to the front end than the bent portion extends parallel to the peripheral surface, or extends such that a distance from the peripheral surface increases toward the front end.

4. The capacitor according to any one of claims 1 to 3, wherein The bus bar further includes a third extension portion, The third extending portion extends from an end of the connecting terminal portion in a second direction perpendicular to the first direction in a direction intersecting the connecting surface and is embedded in the exterior body.

5. The capacitor according to claim 4, wherein The third extension portion is bent in the second direction at a bent portion inside the outer body. A portion of the third extending portion closer to the front end than the bent portion extends parallel to the peripheral surface, or extends such that a distance from the peripheral surface increases toward the front end.

6. A capacitor comprising: A capacitor element having electrodes at both end surfaces; a bus bar connected to the electrodes; and an outer casing formed of resin and covering the capacitor element and a portion of the bus bar; The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected and is exposed from the outer casing. The surface of the connection terminal portion opposite to the connection surface is located away from the one surface so as to face the one surface of the exterior body. The first extension portion extends from the end of the connection terminal portion in the first direction in a direction intersecting the connection surface and is embedded in the interior of the exterior body. The second extension portion extends from both ends of the connection terminal portion in a second direction perpendicular to the first direction in a direction intersecting the connection surface and is embedded in the interior of the exterior body. The first extension portion is connected to the electrode inside the exterior body.

7. The capacitor according to claim 6, wherein The second extension portion extends inside the outer casing toward the peripheral surface of the capacitor element. A portion of the exterior body is interposed between the front end of the second extending portion and the peripheral surface.

8. The capacitor according to claim 7, wherein The second extension portion is bent in the second direction at a bent portion inside the outer body. A portion of the second extending portion closer to the front end than the bent portion extends parallel to the peripheral surface, or extends such that a distance from the peripheral surface increases toward the front end.

9. The capacitor according to claim 1 or 6, wherein: One side of the outer casing is a casting surface.

10. The capacitor according to claim 9, wherein The bus bars are arranged along the first direction, A dimension of the connection terminal portion in a second direction perpendicular to the first direction is equal to or greater than half a dimension of the casting surface in the second direction.

11. A method for manufacturing a capacitor, comprising: A setting step of setting a capacitor module including a capacitor element having electrodes on both end surfaces and a bus bar connected to the electrodes in a casting mold having an opening; an injection step of injecting a thermosetting resin in a liquid phase from the opening into the casting mold box in which the capacitor module is installed; and a curing step of heating and curing the thermosetting resin filled in the casting mold to form an outer casing covering the capacitor element and a portion of the bus bar; The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected. The first extension portion and the second extension portion extend from both ends of the connection terminal portion in the first direction toward the capacitor element in a direction intersecting the connection surface. The first extension portion is connected to the electrode, In the setting step, the capacitor module is set in the casting mold box with the connection terminal portion facing the opening portion. In the injection process, the thermosetting resin is injected into the casting mold box so that the liquid surface of the thermosetting resin which becomes the casting surface of the outer body and the surface of the connecting terminal portion opposite to the connecting surface are separated and opposite to each other, and the front end of the first extension portion and the front end of the second extension portion are buried in the interior of the thermosetting resin.

12. A method for manufacturing a capacitor, comprising: A setting step of setting a capacitor module including a capacitor element having electrodes on both end surfaces and a bus bar connected to the electrodes in a casting mold having an opening; an injection step of injecting a thermosetting resin in a liquid phase from the opening into the casting mold box in which the capacitor module is installed; and a curing step of heating and curing the thermosetting resin filled in the casting mold to form an outer casing covering the capacitor element and a portion of the bus bar; The bus bar includes a connection terminal portion, a first extension portion, and a second extension portion. The connecting terminal portion has a flat connecting surface to which an external terminal is connected. The first extension portion extends from an end of the connection terminal portion in the first direction toward the capacitor element in a direction intersecting the connection surface and is connected to the electrode. The second extension portion extends from both ends of the connection terminal portion in a second direction perpendicular to the first direction toward the capacitor element along a direction intersecting the connection surface. In the setting step, the capacitor module is set in the casting mold box with the connection terminal portion facing the opening portion. In the injection process, the thermosetting resin is injected into the casting mold box so that the liquid surface of the thermosetting resin which becomes the casting surface of the outer body and the surface of the connecting terminal portion opposite to the connecting surface are separated and opposite to each other, and the front end of the first extension portion and the front end of the second extension portion are buried in the interior of the thermosetting resin.

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