Capacitor

Abstract

To provide a capacitor in which thermal injury of a capacitor element is less likely to occur.SOLUTION: A film capacitor 1 includes a capacitor element having a first end face electrode and a second end face electrode, a case 400 in which the capacitor element is received, and a first bus bar 200 and a second bus bar 300 for being connected, respectively, with the first end face electrode and the second end face electrode. The first bus bar 200 and the second bus bar 300 include outside connection terminal parts 230, 330 placed on the outside of the case 400, and connectable with a first external terminal, and relay terminal parts 240, 340 for connection with the outside connection terminal parts 230, 330 on the outside of the case 400. The relay terminal parts 240, 340 have surfaces spreading along the front lateral face part 402 of the case 400 so as to oppose the front lateral face part 402.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a capacitor. [Background technology]

[0002] Conventionally, there is known a capacitor in which a capacitor element to which one end of a bus bar is connected is housed in a case, and a terminal for external connection provided at the other end of the bus bar is drawn to the outside from an opening in the case (see, for example, Patent Document 1). An external terminal extending from an external device is connected to the terminal for external connection. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-252935 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a configuration in which the terminals for external connection are located near the opening of the case, as in conventional capacitors, most of the bus bar is inside the case. In such a configuration, if the external terminals generate heat and the heat is transferred to the bus bar, or if the bus bar itself generates heat, the heat is difficult to dissipate in the bus bar and is likely to be transferred directly to the capacitor element, which may cause thermal damage to the capacitor element.

[0005] In view of the above problems, an object of the present invention is to provide a capacitor in which the capacitor element is less susceptible to thermal damage. [Means for solving the problem]

[0006] A capacitor according to a main aspect of the present invention includes a capacitor element having a first electrode and a second electrode, a first bus bar and a second bus bar connected to the first electrode and the second electrode, respectively;a case in which the capacitor element is housed; Here, the first bus bar and the second bus bar Uh , Each 1 Connection terminal section and ,before an electrode connection portion connected to a corresponding one of the first electrode and the second electrode; The case has a second connection terminal portion provided between the first connection terminal portion and the electrode connection portion, and a relay terminal portion provided between the first connection terminal portion and the second connection terminal portion. The first connection terminal portion, the relay terminal portion, and the second connection terminal portion are arranged outside the case. The relay terminal portion of the first bus bar and the relay terminal portion of the second bus bar are arranged along a side portion of the case outside the case and have portions that overlap each other. Effect of the Invention

[0007] According to the present invention, a capacitor can be provided in which the capacitor element is less susceptible to thermal damage.

[0008] The effects and significance of the present invention will become clearer from the following description of the embodiment. However, the embodiment shown below is merely an example of how the present invention can be put into practice, and the present invention is not limited to the embodiment described below. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a film capacitor according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the film capacitor according to the embodiment. [Diagram 3] 3(a) and (b) are perspective views of a first inner member and a first outer member, respectively, according to an embodiment. [Figure 4] 4(a) and (b) are perspective views of a second inner member and a second outer member, respectively, according to an embodiment. [Diagram 5] FIG. 5 is a diagram illustrating a state in which the film capacitor according to the embodiment is connected to an inverter device and a power supply device. [Figure 6] FIG. 6 is a perspective view of a film capacitor according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A film capacitor 1, which is one embodiment of a capacitor of the present invention, will be described below with reference to the drawings. For convenience, the front-rear, left-right, and up-down directions are indicated in each drawing as appropriate. Note that the directions shown in the drawings indicate only relative directions of the film capacitor 1, and do not indicate absolute directions. For convenience of explanation, some components may be given names that correspond to the directions shown in the drawings, such as "bottom portion" and "front side portion."

[0011] In this embodiment, the film capacitor 1 corresponds to the "capacitor" in the claims. The inverter device 2 corresponds to the "semiconductor device" in the claims. The first end surface electrode 110 corresponds to the "first electrode" in the claims, and the second end surface electrode 120 corresponds to the "second electrode" in the claims. The first inner member 200a and the second inner member 300a correspond to the "second member" in the claims. The first outer member 200b and the second outer member 300b correspond to the "first member" in the claims. The inner connection terminals 220 and 320 correspond to the "second connection terminal" in the claims. The outer connection terminals 230 and 330 correspond to the "first connection terminal" in the claims. The relay terminals 240 and 340 correspond to the "exposed portion" in the claims. The front side portion 402 corresponds to the "side portion" in the claims. Furthermore, the second insulating sheet 700 corresponds to the "insulating member" recited in the claims.

[0012] However, the above description is intended merely to match the configuration of the claims with the configuration of the embodiments, and the above correspondence does not in any way limit the invention described in the claims to the configuration of the embodiments.

[0013] Fig. 1 is a perspective view of the film capacitor 1. Fig. 2 is an exploded perspective view of the film capacitor 1.

[0014] The film capacitor 1 includes four capacitor elements 100, a first bus bar 200, a second bus bar 300, a case 400, and a filled resin 500. The first bus bar 200 is composed of a first inner member 200a and a first outer member 200b, and the second bus bar 300 is composed of a second inner member 300a and a second outer member 300b.

[0015] The four capacitor elements 100, the first inner member 200a, and the second inner member 300a are assembled together and housed in the case 400. The filled resin 500 is a thermosetting resin, for example, an epoxy resin, and is filled in the case 400. The four capacitor elements 100 and most of the first inner member 200a and the second inner member 300a are buried in the filled resin 500, and are protected from moisture and impact by the case 400 and the filled resin 500.

[0016] The first outer member 200b and the second outer member 300b are combined and attached to the front surface of the case 400. As a result, the first bus bar 200 connects the first inner member 200a and the first outer member 200b, and the second bus bar 300 connects the second inner member 300a and the second outer member 300b.

[0017] The film capacitor 1 will be described in detail below.

[0018] 2, capacitor element 100 is formed by stacking two metallized films, each having aluminum vapor-deposited on a dielectric film, rolling or laminating the stacked metallized films, and pressing them into a flat shape. Capacitor element 100 has a shape similar to a flat oval cylinder. On one end face 101 of capacitor element 100, a first end face electrode 110 is formed by spraying a metal such as zinc, and on the other end face 102, a second end face electrode 120 is formed by spraying a metal such as zinc. The four capacitor elements 100 are arranged in two rows, one above the other, with both end faces 101, 102 facing the front-rear direction, with two capacitor elements on each row. In this state, a first inner member 200a of first bus bar 200 and a second inner member 300a of second bus bar 300 are connected to these capacitor elements 100.

[0019] Although capacitor element 100 of the present embodiment is formed of a metallized film in which aluminum is deposited on a dielectric film, it may also be formed of a metallized film in which other metals such as zinc, magnesium, etc. Alternatively, capacitor element 100 may be formed of a metallized film in which a plurality of these metals are deposited, or a metallized film in which an alloy of these metals is deposited.

[0020] As described above, the first bus bar 200 includes a first inner member 200a and a first outer member 200b.

[0021] 3(a) and (b) are perspective views of the first inner member 200a and the first outer member 200b, respectively.

[0022] As shown in FIG. 3(a), the first inner member 200a is formed by appropriately cutting out and bending a conductive material, such as a copper plate, and has a configuration in which an electrode terminal portion 210 and three inner connection terminal portions 220 are integrated together.

[0023] The electrode terminal portion 210 includes a side portion 211 and an upper surface portion 212 that is bent vertically backward from the upper end portion of the side portion 211. The side portion 211 has a rectangular shape with the lower right corner missing. The upper surface portion 212 has a long and narrow rectangular shape, with a rear end portion 212a that rises upward.

[0024] In the electrode terminal portion 210, four rectangular openings 213 aligned in the left-right direction are formed in the upper part of the side surface portion 211, and a connection pin 214 is formed at the upper edge of each opening 213. In addition, in the electrode terminal portion 210, four connection pins 214 aligned in the left-right direction are formed in the lower end portion of the side surface portion 211. Furthermore, in the electrode terminal portion 210, a circulation opening 215 is formed in the center in the left-right direction by cutting out the lower end portion of the side surface portion 211 in a semicircular shape, and a circulation opening 216 that is long in the vertical direction is formed so as to straddle the side surface portion 211 and the upper surface portion 212.

[0025] The three inner connection terminal portions 220 have a rectangular shape and extend upward from the upper end portion of the electrode terminal portion 210, i.e., the rear end portion 212a of the upper surface portion 212. The three inner connection terminal portions 220 are lined up at equal intervals in the left-right direction. Each of the inner connection terminal portions 220 has a circular through hole 221 formed therein.

[0026] As shown in FIG. 3(b), the first outer member 200b is formed by appropriately cutting out and bending a conductive material, for example, a copper plate, and has a configuration in which an outer connection terminal portion 230 and a relay terminal portion 240 are integrated.

[0027] The outer connection terminal portion 230 has a rectangular shape. A circular through hole 231 is formed in the outer connection terminal portion 230.

[0028] The relay terminal portion 240 includes a terminal main body portion 241, a first connecting portion 242, and three second connecting portions 243. The terminal main body portion 241 has a hook shape with the right side bent downward. The upper right corner of the terminal main body portion 241 is cut out in an arc shape to avoid a mounting boss (described later) of the case 400.

[0029] The first connecting portion 242 extends rightward from the lower right end of the terminal body 241, then bends and extends backward, and is connected to the outer connection terminal portion 230. The three second connecting portions 243 are provided at the upper end of the terminal body 241 so as to be aligned at equal intervals in the left-right direction. Each second connecting portion 243 extends upward, then bends and extends backward, and is further bent so that its tip portion 243a extends upward. A circular through hole 244 is formed in the tip portion 243a of the second connecting portion 243. The left-right width of the tip portion 243a of the second connecting portion 243 and the inner diameter of the through hole 244 are set equal to the left-right width of the inner connection terminal portion 220 of the first inner member 200a and the inner diameter of the through hole 221.

[0030] The first connecting portion 242 extends to the terminal body 241 with the same width as the first connecting portion 242 in the outer connection terminal portion 230, i.e., the width (vertical width) W1 of the base end portion 230a connected to the relay terminal portion 240. On the other hand, the vertical width W2 of the terminal body 241 is not constant, being wider on the right side and narrower on the left side, but is wider than the width W1 of the base end portion 230a. Furthermore, the horizontal width W3 of the terminal body 241 is not constant, being narrower on the lower side and wider on the upper side, but is wider than the width W1 of the base end portion 230a. In other words, the terminal body 241 is not configured to extend leftward and upward with a width equal to the width W1 of the base end portion 230a of the outer connection terminal portion 230 as shown by the dashed line in FIG. 3(b), and a large area is secured.

[0031] As described above, the second bus bar 300 includes the second inner member 300a and the second outer member 300b.

[0032] 4(a) and (b) are perspective views of the second inner member 300a and the second outer member 300b, respectively.

[0033] As shown in FIG. 4(a), the second inner member 300a is formed by appropriately cutting out and bending a conductive material, such as a copper plate, and has a configuration in which an electrode terminal portion 310 and three inner connection terminal portions 320 are integrated together.

[0034] The electrode terminal portion 310 includes a side portion 311 and an upper surface portion 312 that is bent vertically forward from the upper end portion of the side portion 311. The side portion 311 has a rectangular shape with the lower right corner missing. The upper surface portion 312 has a rectangular shape with a front end portion 312a that rises upward.

[0035] In the electrode terminal portion 310, four square openings 313 aligned in the left-right direction are formed in the center of the side surface portion 311, and a connection pin 314 is formed at the upper edge of each opening 313. In addition, in the electrode terminal portion 310, four connection pins 314 aligned in the left-right direction are formed at the lower end of the side surface portion 311. Furthermore, in the electrode terminal portion 310, a circular communication opening 315 and a communication opening 316 that is long in the vertical direction and straddles the side surface portion 311 and the upper surface portion 312 are formed in the center in the left-right direction.

[0036] The three inner connection terminal portions 320 have a rectangular shape and extend upward from the upper end portion of the electrode terminal portion 310, i.e., the front end portion 312a of the upper surface portion 312. The three inner connection terminal portions 320 are lined up at equal intervals in the left-right direction. Each of the inner connection terminal portions 320 has a circular through hole 321 formed therein.

[0037] As shown in FIG. 4(b), the second outer member 300b is formed by appropriately cutting out and bending a conductive material, for example, a copper plate, and has a configuration in which an outer connection terminal portion 330 and a relay terminal portion 340 are integrated.

[0038] The outer connection terminal portion 330 has a rectangular shape. A circular through hole 331 is formed in the outer connection terminal portion 330.

[0039] The relay terminal portion 340 includes a terminal main body portion 341, a first connecting portion 342, and three second connecting portions 343. The terminal main body portion 341 has a hook shape with the right side bent downward. The upper left corner and the upper right corner of the terminal main body portion 341 are cut out in an arc shape and a square shape, respectively, to avoid the mounting boss (described later) of the case 400.

[0040] The first connecting portion 342 extends rightward from the lower right end of the terminal body 341, then bends and extends backward, and is connected to the outer connection terminal portion 330. The three second connecting portions 343 are provided at the upper end of the terminal body 341 so as to be aligned at equal intervals in the left-right direction. Each second connecting portion 343 extends upward, then bends and extends backward, and further bends, with its tip portion 343a extending upward. A circular through hole 344 is formed in the tip portion 343a of the second connecting portion 343. The left-right width of the tip portion 343a of the second connecting portion 343 and the inner diameter of the through hole 344 are set equal to the left-right width of the inner connection terminal portion 320 of the second inner member 300a and the inner diameter of the through hole 321.

[0041] The first connecting portion 342 extends to the terminal body 341 with the same width as the first connecting portion 342 in the outer connection terminal portion 330, i.e., the width (vertical width) W4 of the base end portion 330a connected to the relay terminal portion 340. On the other hand, the vertical width W5 of the terminal body 341 is not constant, being wider on the right side and narrower on the left side, but is wider than the width W4 of the base end portion 330a. Furthermore, the horizontal width W6 of the terminal body 341 is not constant, being narrower on the lower side and wider on the upper side, but is wider than the width W4 of the base end portion 330a. In other words, the terminal body 341 is not configured to extend leftward and upward with a width equal to the width W4 of the base end portion 330a of the outer connection terminal portion 330 as shown by the dashed line in FIG. 4(b), and a large area is secured.

[0042] 2, the electrode terminal portion 210 of the first inner member 200a covers the first end surface electrodes 110 of the four capacitor elements 100 from the front, and the electrode terminal portion 310 of the second inner member 300a covers the second end surface electrodes 120 of the four capacitor elements 100 from the rear. Two connection pins 214 of the electrode terminal portion 210 contact the first end surface electrodes 110 of each capacitor element 100, and each connection pin 214 is joined to the corresponding first end surface electrodes 110 by a joining method such as soldering. Similarly, two connection pins 314 of the electrode terminal portion 310 contact the second end surface electrodes 120 of each capacitor element 100, and each connection pin 314 is joined to the corresponding second end surface electrodes 120 by a joining method such as soldering. As a result, the first bus bar 200 is electrically connected to the first end surface electrodes 110 of the four capacitor elements 100 , and the second bus bar 300 is electrically connected to the second end surface electrodes 120 of the four capacitor elements 100 .

[0043] When the four capacitor elements 100, the first inner member 200a and the second inner member 300a are integrated, the three inner connection terminal portions 220 of the first inner member 200a and the three inner connection terminal portions 320 of the second inner member 300a are arranged alternately in the left-right direction.

[0044] A first insulating sheet 600 is sandwiched between the first inner member 200a and the second inner member 300a. The first insulating sheet 600 is made of insulating paper or a resin material having electrical insulation properties, such as acrylic or silicone. The first insulating sheet 600 ensures an insulation distance between the first inner member 200a and the second inner member 300a, an insulation distance between the second inner member 300a and the first end surface electrode 110 of the capacitor element 100, and the like.

[0045] 2, the first outer member 200b and the second outer member 300b are overlapped front to back such that their relay terminal portions 240, 340, i.e., the terminal main bodies 241, 341, have overlapping portions via the second insulating sheet 700. The second insulating sheet 700 is made of insulating paper or a resin material having electrical insulation properties such as acrylic or silicone. The second insulating sheet 700 ensures an insulation distance between the two relay terminal portions 240, 340.

[0046] The first outer member 200b and the second insulating sheet 700 are fixed with double-sided tape (not shown), and the second outer member 300b and the second insulating sheet 700 are fixed with double-sided tape (not shown). In this way, the first outer member 200b, the second outer member 300b, and the second insulating sheet 700 are fixed together.

[0047] When the first outer member 200b and the second outer member 300b are integrated, the three second coupling portions 243 of the first outer member 200b and the three second coupling portions 343 of the second outer member 300b are arranged alternately in the left-right direction. In addition, the outer connection terminal portion 230 of the first outer member 200b and the outer connection terminal portion 330 of the second outer member 300b are arranged in the up-down direction.

[0048] 2, case 400 is made of resin, for example, polyphenylene sulfide (PPS), which is a thermoplastic resin. Case 400 is formed in a substantially rectangular box shape, and has bottom surface 401, front side surface 402, rear side surface 403, left side surface 404, and right side surface 405 rising from bottom surface 401, and is open at the top. Case 400 has a longitudinal direction in the left-right direction in which two capacitor elements 100 are lined up in the upper and lower stages, and a lateral direction in which both end faces of four capacitor elements 100 face, which is a lateral direction.

[0049] The case 400 is provided with mounting tabs 410 at the top of the left side surface portion 404, the top of the right side surface portion 405, and at the left and right ends of the bottom surface portion 401. Each mounting tab 410 is formed with a through hole 411. A metal collar 412 is fitted into the through hole 411 to increase the strength of the hole. These mounting tabs 410 are used when the film capacitor 1 is fixed to an installation portion of an external device such as an inverter device.

[0050] A first terminal block 420 and a second terminal block 430 are provided vertically connected below a mounting tab 410 on right side surface 405 of case 400. The upper first terminal block 420 is a terminal block for outer connection terminal portion 230 of first bus bar 200, and the lower second terminal block 430 is a terminal block for outer connection terminal portion 330 of second bus bar 300. A mounting surface 421 of first terminal block 420 and a mounting surface 431 of second terminal block 430 are separated by a rib 440.

[0051] A metal nut 422 is embedded in the mounting surface 421 of the first terminal block 420. A downward claw portion 423 is formed on the upper part of the mounting surface 421 of the first terminal block 420. A metal nut 432 is embedded in the mounting surface 431 of the second terminal block 430. A upward claw portion 433 is formed on the lower part of the mounting surface 431 of the second terminal block 430.

[0052] The front side surface 402 of the case 400 is provided with mounting bosses 450 in a total of five locations, including the center and the four corners. A metal nut 451 is embedded in each mounting boss 450. In addition, the front side surface 402 of the case 400 is formed with a right-facing claw portion 461 near the upper left corner, and an upward-facing claw portion 462 is formed near the right end of the lower end.

[0053] A unit consisting of the four capacitor elements 100, the first inner member 200a, and the second inner member 300a is housed in the case 400 through the opening 400a on the top surface. Then, the filling resin 500 in a liquid phase is injected into the case 400. At this time, the filling resin 500 passes through the flow openings 215, 216 of the first inner member 200a and the flow openings 315, 316 of the second inner member 300a, so that the filling resin 500 easily reaches the portions of the four capacitor elements 100 inside the first inner member 200a and the second inner member 300a. When the filling resin 500 fills the case 400 up to the vicinity of the opening 400a and the injection of the filling resin 500 is completed, the case 400 is heated. As a result, the filling resin 500 in the case 400 hardens.

[0054] Thereafter, a unit consisting of the first outer member 200b and the second outer member 300b is attached to the case 400. At this time, the outer connection terminal portion 230 of the first outer member 200b is attached to the attachment surface 421 of the first terminal block 420, and the outer connection terminal portion 330 of the second outer member 300b is attached to the attachment surface 431 of the second terminal block 430. The through hole 231 of the outer connection terminal portion 230 is aligned with the nut 422 of the first terminal block 420, and the through hole 331 of the outer connection terminal portion 330 is aligned with the nut 432 of the second terminal block 430.

[0055] The terminal main body 241 of the relay terminal 240 of the first outer member 200b and the terminal main body 241 of the relay terminal 240 of the first outer member 200b are aligned along the front side surface portion 402 so that their surfaces face the front side surface portion 402. The two terminal main bodies 241, 341 overlap each other in front of the front side surface portion 402 with the second insulating sheet 700 interposed therebetween. In addition, the three second coupling portions 243 of the first outer member 200b are overlapped from the front onto the corresponding inner connection terminal portions 220 of the first inner member 200a, and the three second coupling portions 343 of the second outer member 300b are overlapped from the front onto the corresponding inner connection terminal portions 320 of the second inner member 300a. The through holes 244, 344 of each of the second coupling portions 243, 343 and the through holes 221, 321 of each of the inner connection terminal portions 220, 320 are aligned.

[0056] The outer connection terminal portion 230 of the first outer member 200b engages with the claw portion 423 of the first terminal block 420, and the outer connection terminal portion 330 of the second outer member 300b engages with the claw portion 433 of the second terminal block 430. In addition, the terminal main body portion 341 of the second outer member 300b engages with the two claw portions 461, 462 of the front side surface portion 402. As a result, the unit consisting of the first outer member 200b and the second outer member 300b is fixed to the case 400.

[0057] In this way, the film capacitor 1 is completed as shown in FIG.

[0058] The film capacitor 1 can be mounted, for example, in an inverter device for driving an electric motor in an electric vehicle.

[0059] FIG. 5 is a diagram showing a schematic diagram of a state in which the film capacitor 1 is connected to an inverter device 2 and a power supply device 3. As shown in FIG.

[0060] The inverter device 2 is supplied with DC power from a power supply device 3 (battery). The inverter device 2 includes an inverter circuit including IGBTs (Insulated Gate Bipolar Transistors), converts the DC power into three-phase AC power, and supplies it to an electric motor (not shown). In this way, the inverter device 2 is a semiconductor device (power semiconductor device) for converting power.

[0061] In the film capacitor 1, the outer connection terminal portion 230 of the first busbar 200 is connected to the corresponding first external terminal 11, and is connected to the terminal 3a of the power supply device 3 having the same polarity as the outer connection terminal portion 230 via the first external terminal 11. The outer connection terminal portion 330 of the second busbar 300 is connected to the corresponding first external terminal 12, and is connected to the terminal 3b of the power supply device 3 having the same polarity as the outer connection terminal portion 330 via the first external terminal 12. At this time, the outer connection terminal portion 230 and the first external terminal 11 of the first busbar 200 are attached to the first terminal block 420 by screwing into the nut 422 in an overlapping state. Similarly, the outer connection terminal portion 330 and the first external terminal 12 of the second busbar 300 are attached to the second terminal block 430 by screwing into the nut 432 in an overlapping state.

[0062] Furthermore, in the film capacitor 1, the three inner connection terminal portions 220 of the first bus bar 200 are connected to the corresponding second external terminals 13, and are connected to the terminal 2a on the inverter device 2 side, which has the same polarity as the inner connection terminal portions 220, via the second external terminals 13. Furthermore, the three inner connection terminal portions 320 of the second bus bar 300 are connected to the corresponding second external terminals 14, and are connected to the terminal 2b on the inverter device 2 side, which has the same polarity as the inner connection terminal portions 320, via the second external terminals 14. At this time, the inner connection terminal portions 220 of the first inner member 200a, the second coupling portions 243 of the first outer member 200b, and the second external terminals 13 are fastened and fixed together by screws (not shown) and nuts (not shown). Similarly, the inner connection terminal portion 320 of the second inner member 300a, the second connecting portion 343 of the second outer member 300b, and the second external terminal 14 are fastened and fixed together by a screw (not shown) and a nut (not shown).

[0063] In this way, the connection between the inner connection terminal portion 220 and the second external terminal 13 and the fixing between the first inner member 200a and the first outer member 200b can be performed by fastening with a single screw. Similarly, the connection between the inner connection terminal portion 320 and the second external terminal 14 and the fixing between the second inner member 300a and the second outer member 300b can be performed by fastening with a single screw. This reduces the number of screws and the screw fastening process. In addition, it is no longer necessary to provide a connecting portion for connecting the first inner member 200a and the second inner member 300a to the second connecting portion 243, 343.

[0064] When the electric motor is driven by the inverter device 2 and electricity is applied to the film capacitor 1, a large direct current from the power supply device 3 may flow through the relay terminal portion 240 that constitutes a path connecting the outer connection terminal portion 230 and the inner connection terminal portion 220 in the first bus bar 200. Heat generated at the first external terminal 11 due to the large direct current from the power supply device 3 may be transmitted to the relay terminal portion 240 via the outer connection terminal portion 230. Similarly, a large direct current from the power supply device 3 may flow through the relay terminal portion 340 that constitutes a path connecting the outer connection terminal portion 330 and the inner connection terminal portion 320 in the second bus bar 300. Heat generated at the first external terminal 12 due to the large direct current from the power supply device 3 may be transmitted to the relay terminal portion 340 via the outer connection terminal portion 330.

[0065] However, these relay terminals 240, 340 are exposed to the outside of the case 400, particularly to the outside of the filled resin 500. Furthermore, the terminal main bodies 241, 341 of these relay terminals 240, 340 are aligned along the front side surface 402 of the case 400, and as long as they do not protrude from the area of ​​the front side surface 402, the size of the film capacitor 1 is unlikely to increase. For this reason, a large area is ensured for the terminal main bodies 241, 341 of the relay terminals 240, 340. Therefore, since the relay terminals 240, 340 have low electrical resistance and good heat dissipation properties, they are unlikely to generate heat even if a large current flows through them, and even if heat is transmitted to them, the heat is easily dissipated.

[0066] Furthermore, terminal main bodies 241, 341 of relay terminal portions 240, 340 of first bus bar 200 and second bus bar 300 overlap each other in front of front side surface portion 402, with second insulating sheet 700 interposed therebetween. This reduces ESL (equivalent series inductance).

[0067] <Effects of the embodiment> As described above, according to the present embodiment, the following effects are achieved.

[0068] The film capacitor 1 includes a first bus bar 200 and a second bus bar 300 arranged outside the case 400, and outer connection terminal portions 230, 330 connectable to the first external terminals 11, 12, and relay terminal portions 240, 340 extending outside the case 400 and connected to the outer connection terminal portions 230, 330, and the relay terminal portions 240, 340 are aligned along the front side portion 402 of the case 400 so that their surfaces face the front side portion 402.

[0069] According to this configuration, relay terminal portions 240, 340 can secure a large area in the portion (terminal main body portions 241, 341) along front side surface portion 402 of case 400, so that electrical resistance is reduced and heat dissipation is improved. Therefore, when a current flows through relay terminal portions 240, 340, relay terminal portions 240, 340 themselves are less likely to generate heat, and even if heat generated in first external terminals 11, 12 is transmitted via outer connection terminal portions 230, 330, the heat is easily dissipated by relay terminal portions 240, 340. Therefore, heat transmitted to capacitor element 100 through first bus bar 200 and second bus bar 300 can be reduced, so that thermal damage to capacitor element 100 can be prevented.

[0070] Furthermore, relay terminal portion 240 of first bus bar 200 and relay terminal portion 340 of second bus bar 300 have portions that overlap each other on the front surface of front side portion 402, with second insulating sheet 700 interposed between them.

[0071] This configuration makes it possible to reduce the ESL (equivalent series inductance).

[0072] Furthermore, first bus bar 200 and second bus bar 300 further include inner connection terminal portions 220, 320 that are exposed from filled resin 500 and to which second external terminals 13, 14 are connected. The outer connection terminal portions 230, 330 are connected to power supply device 3 via first external terminals 11, 12, and the inner connection terminal portions 220, 320 are connected to inverter device 2 via second external terminals 13, 14. The relay terminal portions 240, 340 form paths that connect the outer connection terminal portions 230, 330 and the inner connection terminal portions 220, 320.

[0073] According to this configuration, even if a large current from the power supply device 3 flows through the relay terminal parts 240, 340, the relay terminal parts 240, 340 themselves are unlikely to heat up. Furthermore, even if the first external terminals 11, 12 generate heat due to the large current from the power supply device 3 and the heat is transmitted, the heat can be dissipated well in the relay terminal parts 240, 340. Therefore, since it is possible to prevent the heat caused by the large current from the power supply device 3 from being transmitted to the capacitor element 100, it is possible to make it difficult for thermal damage to occur in the capacitor element 100.

[0074] Furthermore, the first bus bar 200 includes a first outer member 200b having a relay terminal portion 240 and an outer connection terminal portion 230, a first inner member 200a having a connection pin 214 embedded in the filling resin 500 and connected to the first end surface electrode 110, and an inner connection terminal portion 220, and is coupled to the first outer member 200b. The second bus bar 300 includes a second outer member 230b having a relay terminal portion 340 and an outer connection terminal portion 330, and a second inner member 300a having a connection pin 314 embedded in the filling resin 500 and connected to the second end surface electrode 120, and an inner connection terminal portion 320, and is coupled to the second outer member 300b.

[0075] According to the above configuration, after a unit formed by connecting the first inner member 200a and the second inner member 300a to the capacitor element 100 is housed in the case 400 and filled with the filling resin 500, the first outer member 200b and the second outer member 300b can be attached to the case 400, the first outer member 200b can be connected to the first inner member 200a, and the second outer member 300b can be connected to the second inner member 300a. This makes it possible to easily assemble the film capacitor 1.

[0076] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and application examples of the present invention can be modified in various ways in addition to the above embodiment.

[0077] For example, in the above embodiment, first terminal block 420 to which outer connection terminal portion 230 of first bus bar 200 is attached and second terminal block 430 to which outer connection terminal portion 330 of second bus bar 300 is attached are provided on right side surface portion 405 different from front side surface portion 402 to which relay terminal portions 240, 340 of first bus bar 200 and second bus bar 300 are aligned. However, as shown in Fig. 6, first terminal block 420 and second terminal block 430 may be provided on front side surface portion 402, which is the same side surface portion to which relay terminal portions 240, 340 are aligned, and outer connection terminal portion 230 of first bus bar 200 and outer connection terminal portion 330 of second bus bar 300 are attached to these terminal blocks 420, 430, respectively. In this case, in the relay terminal portions 240, 340, the first linking portions 242, 342 extend downward from the lower ends of the terminal main bodies 241, 341, and then bend and extend forward to connect to the outer connection terminal portions 230, 330. In the first terminal block 420 and the second terminal block 430, the upward claw portions 423, 433 engage with the attached outer connection terminal portions 230, 330.

[0078] Furthermore, relay terminal portions 240, 340 of first bus bar 200 and second bus bar 300 may be arranged along a side surface portion of case 400 other than front side surface portion 402. In this case, relay terminal portions 240, 340 are desirably arranged along rear side surface portion 403, which, like front side surface portion 402, has a larger area than left side surface portion 404 and right side surface portion 405.

[0079] Furthermore, in the above embodiment, both first bus bar 200 and second bus bar 300 include relay terminal portions 240, 340 that are arranged along front side surface portion 402 of case 400. However, a configuration in which only first bus bar 200 includes relay terminal portion 240, or only second bus bar 300 includes relay terminal portion 340 may also be adopted.

[0080] Furthermore, in the above embodiment, the second coupling portion 243 of the first outer member 200b is coupled to the inner connection terminal portion 220 of the first inner member 200a, and the second coupling portion 343 of the second outer member 300b is coupled to the inner connection terminal portion 320 of the second inner member 300a. However, the second coupling portion 243 of the first outer member 200b may be coupled to a coupling portion separately provided on the first inner member 200a, and the second coupling portion 343 of the second outer member 300b may be coupled to a coupling portion separately provided on the second inner member 300a.

[0081] Furthermore, in the above embodiment, first bus bar 200 is formed of two members, first inner member 200a and first outer member 200b, and second bus bar 300 is formed of two members, second inner member 300a and second outer member 300b. However, first bus bar 200 and second bus bar 300 may be formed of a single member.

[0082] Furthermore, in the above embodiment, the film capacitor 1 is provided with four capacitor elements 100. However, the number of capacitor elements 100 can be changed as appropriate, including the case where there is only one capacitor element.

[0083] Furthermore, in the above embodiment, capacitor element 100 is formed by stacking two metallized films having aluminum vapor-deposited on a dielectric film and rolling or laminating the stacked metallized films, but capacitor elements 100 may also be formed by stacking a metallized film having aluminum vapor-deposited on both sides of a dielectric film and an insulating film, and rolling or laminating the resulting film.

[0084] Furthermore, in the above embodiment, the film capacitor 1 is given as an example of the capacitor of the present invention. However, the present invention can be applied to capacitors other than the film capacitor 1.

[0085] In addition, the embodiments of the present invention can be modified in various ways as appropriate within the scope of the technical ideas set forth in the claims.

[0086] In addition, in the description of the above embodiment, terms indicating directions such as "upper" and "lower" indicate relative directions that depend only on the relative positional relationship of the components, and do not indicate absolute directions such as the vertical direction or the horizontal direction. [Industrial Applicability]

[0087] The present invention is useful for capacitors used in various electronic devices, electric devices, industrial devices, vehicle electrical equipment, and the like. [Explanation of symbols]

[0088] 1. Film capacitor (capacitor) 2. Inverter device (semiconductor device) 3 Power supply 11 First external terminal 12 First external terminal 13 Second external terminal 14 Second external terminal 100 Capacitor element 110 First end electrode (first electrode) 120 Second end electrode (second electrode) 200 1st bus bar 200a First inner member (second member) 200b First outer member (first member) 220 Inner connection terminal portion (second connection terminal portion) 230 Outer connection terminal portion (first connection terminal portion) 240 Relay terminal part (exposed part) 300 2nd bus bar 300a: second inner member (second member) 300b Second outer member (first member) 320 Inner connection terminal part (second connection terminal part) 330 Outer connection terminal portion (first connection terminal portion) 340 Relay terminal part (exposed part) 400 cases 402 Front side part (side part) 500 Filled Resin 700 Second insulating sheet (insulating material)

Claims

1. a capacitor element having a first electrode and a second electrode; a first bus bar and a second bus bar connected to the first electrode and the second electrode, respectively; a case in which the capacitor element is housed, The first bus bar and the second bus bar each have A first connection terminal portion; an electrode connection portion connected to a corresponding one of the first electrode and the second electrode; a second connection terminal portion provided between the first connection terminal portion and the electrode connection portion; a relay terminal portion provided between the first connection terminal portion and the second connection terminal portion, the first connection terminal portion, the relay terminal portion, and the second connection terminal portion are disposed outside the case, the relay terminal portion of the first bus bar and the relay terminal portion of the second bus bar have portions that are aligned along a side surface of the case outside the case and overlap each other. A capacitor characterized by:

2. 2. The capacitor according to claim 1, the first connection terminal portion is connected to a power supply device via a first external terminal, The second connection terminal portion is connected to a semiconductor device via a second external terminal. A capacitor characterized by:

3. 2. The capacitor according to claim 1, A filling resin is provided to fill the case, The electrode connection portion is embedded in the filling resin. A capacitor characterized by:

4. The capacitor according to any one of claims 1 to 3, the relay terminal portion of the first bus bar and the relay terminal portion of the second bus bar overlap each other via an insulating member. A capacitor characterized by:

5. The capacitor according to any one of claims 1 to 4, The first bus bar and the second bus bar are a first member having the first connection terminal portion and the relay terminal portion; a second member having the electrode connection portion and the second connection terminal portion; A capacitor characterized by:

6. 6. The capacitor according to claim 5, The first member has a plurality of connecting portions, The second member includes a plurality of the second connection terminal portions, The plurality of coupling portions are coupled to the plurality of second connection terminal portions, respectively. A capacitor characterized by:

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