JP7349676B2 - capacitor - Google Patents

Description

The present invention relates to capacitors.

Conventionally, capacitors are known in which a capacitor element connected to one end of a bus bar is housed in a case, and a terminal for external connection provided at the other end of the bus bar is pulled out from the opening of the case (for example, , see Patent Document 1). An external terminal extending from an external device is connected to the external connection terminal.

JP2009-252935A

If the configuration is such that the external connection terminal is located near the opening of the case, as in a conventional capacitor, most of the bus bar will be inside the case. In such a configuration, if the external terminal generates heat and that heat is transmitted to the bus bar, or if the bus bar itself generates heat, the heat is difficult to dissipate at the bus bar and is easily transmitted to the capacitor element, so the capacitor element There is a concern that it may suffer from heat damage.

In view of this problem, an object of the present invention is to provide a capacitor in which thermal damage to the capacitor element is less likely to occur.

A capacitor according to a main aspect of the present invention includes a capacitor element having a first electrode and a second electrode, a case in which the capacitor element is housed, and a first bus bar connected to the first electrode and the second electrode, respectively. and a second bus bar, and a filling resin filled in the case . Here, at least one of the first bus bar and the second bus bar includes a first member and a second member connected to the first member. The first member has a first connection terminal portion that is disposed outside the case and is connectable to a first external terminal, and an exposed portion that comes out of the case and connects to the first connection terminal portion. . The second member includes a second connection terminal portion that is exposed from the filled resin and to which a second external terminal is connected, and a second connection terminal portion that is buried in the filled resin and that corresponds to one of the first electrode and the second electrode. an electrode connection portion connected to the electrode connection portion. The first connection terminal section is connected to a power supply device via the first external terminal, and the second connection terminal section is connected to a semiconductor device via the second external terminal. The exposed portion is placed along the side surface of the case so that its surface faces the side surface, and forms a path connecting the first connection terminal and the second connection terminal .

According to the present invention, it is possible to provide a capacitor in which the capacitor element is less likely to be damaged by heat.

The effects and significance of the present invention will become clearer from the following description of the embodiments. However, the embodiments described below are merely examples of implementing the present invention, and the present invention is not limited to what is described in the embodiments below.

FIG. 1 is a perspective view of a film capacitor according to an embodiment. FIG. 2 is an exploded perspective view of the film capacitor according to the embodiment. FIGS. 3A and 3B are perspective views of a first inner member and a first outer member, respectively, according to an embodiment. FIGS. 4A and 4B are perspective views of a second inner member and a second outer member, respectively, according to the embodiment. FIG. 5 is a diagram schematically showing a state in which the film capacitor according to the embodiment is connected to an inverter device and a power supply device. FIG. 6 is a perspective view of a film capacitor according to a modified example.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A film capacitor 1, which is an embodiment of the capacitor of the present invention, will be described below with reference to the drawings. For convenience, front-back, left-right, and up-down directions are indicated in each figure as appropriate. Note that the directions shown in the drawings only indicate relative directions of the film capacitor 1, and do not indicate absolute directions. Further, for convenience of explanation, some components, such as "bottom part" and "front side part", may be named according to the direction shown in the drawing.

In this embodiment, the film capacitor 1 corresponds to the "capacitor" described in the claims. Further, the inverter device 2 corresponds to a "semiconductor device" described in the claims. Furthermore, the first end surface electrode 110 corresponds to a "first electrode" described in the claims, and the second end surface electrode 120 corresponds to a "second electrode" described in the claims. Furthermore, the first inner member 200a and the second inner member 300a correspond to the "second member" described in the claims. Furthermore, the first outer member 200b and the second outer member 300b correspond to the "first member" described in the claims. Furthermore, the inner connection terminal portions 220 and 320 correspond to the “second connection terminal portion” described in the claims. Furthermore, the outer connection terminal parts 230 and 330 correspond to the "first connection terminal part" described in the claims. Furthermore, the relay terminal portions 240 and 340 correspond to the "exposed portion" described in the claims. Furthermore, the front side part 402 corresponds to the "side part" described in the claims. Furthermore, the second insulating sheet 700 corresponds to an "insulating member" described in the claims.

However, the above description is intended solely for the purpose of correlating the structure of the claims with the structure of the embodiments, and the above correspondence allows the invention described in the claims to correspond to the structure of the embodiments. It is not limited in any way.

FIG. 1 is a perspective view of a film capacitor 1. FIG. 2 is an exploded perspective view of the film capacitor 1.

The film capacitor 1 includes four capacitor elements 100, a first bus bar 200, a second bus bar 300, a case 400, and a filling resin 500. The first bus bar 200 includes a first inner member 200a and a first outer member 200b, and the second bus bar 300 includes a second inner member 300a and a second outer member 300b.

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 filling resin 500 is a thermosetting resin, for example, an epoxy resin, and is filled into 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 filling resin 500, and are protected from moisture and impact by the case 400 and the filling resin 500.

The first outer member 200b and the second outer member 300b are combined and attached to the front surface of the case 400. Thereby, in the first bus bar 200, the first inner member 200a and the first outer member 200b are connected, and in the second bus bar 300, the second inner member 300a and the second outer member 300b are connected.

The film capacitor 1 will be explained in detail below.

Referring to FIG. 2, the capacitor element 100 is formed by stacking two metalized films in which aluminum is deposited on a dielectric film, winding or laminating the stacked metalized films, and pressing them into a flat shape. be done. Capacitor element 100 has a shape similar to a flat long cylinder. A first end surface electrode 110 is formed on one end surface 101 of the capacitor element 100 by spraying a metal such as zinc, and a second end surface electrode 120 is formed on the other end surface 102 by spraying a metal such as zinc. It is formed. The four capacitor elements 100 are arranged vertically in two stages, with two in each stage, with both end surfaces 101 and 102 facing in the front-rear direction. The first inner member 200a and the second inner member 300a of the second bus bar 300 are connected.

Note that the capacitor element 100 of this embodiment is formed of a metallized film in which aluminum is vapor-deposited on a dielectric film; It may also be formed from a film. Alternatively, the capacitor element 100 may be formed of a metallized film on which a plurality of these metals are vapor-deposited, or may be formed of a metallized film on which an alloy of these metals is vapor-deposited. .

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

FIGS. 3A and 3B are perspective views of the first inner member 200a and the first outer member 200b, respectively.

As shown in FIG. 3A, the first inner member 200a is formed by suitably cutting out and bending a conductive material such as a copper plate, and the electrode terminal portion 210 and three inner connecting terminal portions 220 are integrally formed. It has a new configuration.

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

In the electrode terminal part 210, four rectangular openings 213 are formed in the upper part of the side surface part 211 and are arranged in the left-right direction, and a connecting pin 214 is formed in the upper edge of each opening 213. Further, in the electrode terminal portion 210, four connection pins 214 arranged in the left-right direction are formed at the lower end of the side surface portion 211. Further, a communication opening 215 is formed in the center portion of the electrode terminal portion 210 in the left-right direction by cutting out the lower end portion of the side surface portion 211 in a semicircular shape, and extends over the side surface portion 211 and the upper surface portion 212. A vertically long communication opening 216 is formed in the opening.

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, that is, from the rear end portion 212a of the upper surface portion 212. The three inner connecting terminal portions 220 are arranged at equal intervals in the left-right direction. A circular through hole 221 is formed in each inner connecting terminal portion 220 .

As shown in FIG. 3B, the first outer member 200b is formed by suitably cutting out and bending a conductive material such as a copper plate, and the outer connecting terminal portion 230 and the relay terminal portion 240 are integrated. It has a configuration.

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

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

The first connecting portion 242 extends rightward from the lower right end of the terminal main body portion 241 and then bends to extend rearward, and is connected to the outer connecting terminal portion 230 . The three second connecting portions 243 are provided at the upper end portion of the terminal body portion 241 so as to be lined up in the left-right direction at equal intervals. Each second connecting portion 243 extends upward, then bends and extends rearward, and then bends further so that its tip 243a extends upward. A circular through hole 244 is formed in the distal end portion 243a of the second connecting portion 243. The left and right widths of the tip portion 243a of the second connecting portion 243 and the inner diameter of the through hole 244 are made equal to the left and right width of the inner connecting terminal portion 220 of the first inner member 200a and the inner diameter of the through hole 221.

The first connecting portion 242 extends to the terminal main body portion 241 with the same width (width in the vertical direction) W1 of the first connecting portion 242 in the outer connecting terminal portion 230, that is, the base end portion 230a connected to the relay terminal portion 240. There is. On the other hand, the vertical width W2 of the terminal body portion 241 is not constant, and is wider on the right side and narrower on the left side, but is wider than the width W1 of the base end portion 230a. Further, the width W3 in the left-right direction of the terminal main body portion 241 is not constant, and is 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 main body portion 241 is configured to extend leftward and upward with a width equal to the width W1 of the base end portion 230a of the outer connecting terminal portion 230, as shown by the dashed line in FIG. 3(b). The area is large and has a large area.

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

FIGS. 4A and 4B are perspective views of the second inner member 300a and the second outer member 300b, respectively.

As shown in FIG. 4(a), the second inner member 300a is formed by suitably cutting out and bending a conductive material such as a copper plate, and the electrode terminal portion 310 and three inner connecting terminal portions 320 are integrally formed. It has a new configuration.

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

In the electrode terminal section 310, four rectangular openings 313 arranged in the left-right direction are formed in the center of the side surface 311, and a connecting pin 314 is formed at the upper edge of each opening 313. Further, in the electrode terminal portion 310, four connection pins 314 arranged in the left-right direction are formed at the lower end of the side surface portion 311. Further, the electrode terminal portion 310 is formed with a circular communication opening 315 and a vertically long communication opening 316 spanning the side surface portion 311 and the top surface portion 312 at the center in the left-right direction.

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, that is, from the front end portion 312a of the upper surface portion 312. The three inner connection terminal portions 320 are arranged in the left-right direction at equal intervals. A circular through hole 321 is formed in each inner connecting terminal portion 320 .

As shown in FIG. 4B, the second outer member 300b is formed by suitably cutting out and bending a conductive material such as a copper plate, and the outer connecting terminal portion 330 and the relay terminal portion 340 are integrated. It has a configuration.

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

The relay terminal section 340 includes a terminal main body section 341, a first connecting section 342, and three second connecting sections 343. The terminal main body portion 341 has a hook-shaped 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 into an arc shape and a rectangular shape, respectively, in order to avoid a mounting boss (described later) of the case 400.

The first connecting portion 342 extends rightward from the lower right end of the terminal main body portion 341 and then bends to extend rearward, and is connected to the outer connecting terminal portion 330 . The three second connecting portions 343 are provided at the upper end portion of the terminal body portion 341 so as to be lined up in the left-right direction at equal intervals. Each second connecting portion 343 extends upward, then bends and extends rearward, and further bends so that its tip 343a extends upward. A circular through hole 344 is formed in the tip 343a of the second connecting portion 343. The left and right widths of the tip portion 343a of the second connecting portion 343 and the inner diameter of the through hole 344 are made equal to the left and right width of the inner connecting terminal portion 320 of the second inner member 300a and the inner diameter of the through hole 321.

The first connecting portion 342 extends to the terminal main body portion 341 with the same width (vertical width) W4 of the first connecting portion 342 in the outer connecting terminal portion 330, that is, the base end portion 330a connected to the relay terminal portion 340. There is. On the other hand, the vertical width W5 of the terminal body portion 341 is not constant, and is 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 width W6 of the terminal main body 341 in the left-right direction is not constant and is narrower at the bottom and wider at the top, but is wider than the width W4 of the base end 330a. In other words, the terminal main body part 341 is configured to extend leftward and upward with a width equal to the width W4 of the base end part 330a of the outer connecting terminal part 330, as shown by the dashed line in FIG. 4(b). The area is large and has a large area.

As shown in FIG. 2, the electrode terminal portion 210 of the first inner member 200a covers the first end 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 four capacitor elements 100. from the rear. Two connecting pins 214 of the electrode terminal section 210 are in contact with the first end electrode 110 of each capacitor element 100, and each connecting pin 214 is joined to the corresponding first end electrode 110 by a joining method such as soldering. Ru. Similarly, the two connecting pins 314 of the electrode terminal section 310 are in contact with the second end electrode 120 of each capacitor element 100, and each connecting pin 314 is connected to the corresponding second end electrode 120 by a joining method such as soldering. It is joined with. 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.

In a state where the four capacitor elements 100, the first inner member 200a, and the second inner member 300a are integrated, the three inner connecting terminal portions 220 of the first inner member 200a and the three inner connecting terminals of the second inner member 300a 320 are arranged alternately in the left and right direction.

The 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 the insulation distance between the first inner member 200a and the second inner member 300a, the insulation distance between the second inner member 300a and the first end electrode 110 of the capacitor element 100, etc. .

Similarly, as shown in FIG. 2, the first outer member 200b and the second outer member 300b have a portion where their relay terminal portions 240, 340, that is, the terminal body portions 241, 341 overlap with each other via the second insulating sheet 700. They are stacked one on top of the other so that they have the same shape. 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 sections 240 and 340.

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). be done. Thereby, the first outer member 200b, the second outer member 300b, and the second insulating sheet 700 are fixed.

In the state where the first outer member 200b and the second outer member 300b are integrated, the three second connecting portions 243 of the first outer member 200b and the three second connecting portions 343 of the second outer member 300b are connected in the left-right direction. line up alternately. Further, the outer connecting terminal portion 230 of the first outer member 200b and the outer connecting terminal portion 330 of the second outer member 300b are arranged in the vertical direction.

Referring to FIG. 2, case 400 is made of resin, for example, polyphenylene sulfide (PPS), which is a thermoplastic resin. The case 400 is formed into a substantially rectangular box shape, and has a bottom surface 401, a front side surface 402, a rear side surface 403, a left side surface 404, and a right side surface 405 rising from the bottom surface 401, and has an open top surface. In the case 400, the longitudinal direction is the left-right direction in which the two capacitor elements 100 are lined up in the upper and lower stages, and the longitudinal direction is the front-rear direction in which both end surfaces of the four capacitor elements 100 are oriented.

Attachment tabs 410 are provided in the case 400 at the upper part of the left side part 404, the upper part of the right side part 405, and the left and right ends of the bottom part 401. Each attachment tab 410 has a through hole 411 formed therein. 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 part of an external device such as an inverter device.

A first terminal block 420 and a second terminal block 430 are provided on the right side part 405 of the case 400 under the mounting tab 410 so as to be vertically connected. The first terminal block 420 on the upper side is a terminal block for the outer connection terminal section 230 of the first bus bar 200, and the second terminal block 430 on the lower side is a terminal block for the outer connection terminal section 330 of the second bus bar 300. It is a terminal block. The mounting surface 421 of the first terminal block 420 and the mounting surface 431 of the second terminal block 430 are partitioned by a rib 440.

A metal nut 422 is embedded in the mounting surface 421 of the first terminal block 420. Further, the mounting surface 421 of the first terminal block 420 is provided with a downwardly directed claw portion 423 at the top. A metal nut 432 is embedded in the mounting surface 431 of the second terminal block 430. Further, an upwardly directed claw portion 433 is formed at the lower part of the mounting surface 431 of the second terminal block 430 .

Attachment bosses 450 are provided at a total of five locations on the front side portion 402 of the case 400, including the center and four corners. A metal nut 451 is embedded in each attachment boss 450. Further, on the front side surface portion 402 of the case 400, a rightward claw portion 461 is formed near the upper left corner, and an upwardly directed claw portion 462 is formed near the right end of the lower end portion.

A unit consisting of four capacitor elements 100, a first inner member 200a, and a second inner member 300a is accommodated in the case 400 through the opening 400a on the top surface. Thereafter, 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 filled resin 500 is inside the first inner member 200a and the second inner member 300a. The filling resin 500 is easily spread over certain four capacitor elements 100. When the case 400 is filled with the filling resin 500 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 filled resin 500 inside the case 400 is cured.

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 connecting terminal section 230 of the first outer member 200b is attached to the mounting surface 421 of the first terminal block 420, and the outer connecting terminal section 330 of the second outer member 300b is attached to the mounting surface 431 of the second terminal block 430. It is attached. The through hole 231 of the outer connection terminal section 230 is aligned with the nut 422 of the first terminal block 420, and the through hole 331 of the outer connection terminal section 330 is aligned with the nut 432 of the second terminal block 430.

The terminal body part 241 of the relay terminal part 240 of the first outer member 200b and the terminal body part 241 of the relay terminal part 240 of the first outer member 200b are arranged on the front side surface so that their surfaces face the front side surface part 402. 402. The two terminal body parts 241 and 341 overlap each other in front of the front side part 402 with the second insulating sheet 700 interposed therebetween. Further, the three second connecting portions 243 of the first outer member 200b are overlapped from the front with the inner connecting terminal portions 220 of the first inner member 200a, and the three second connecting portions of the second outer member 300b are overlapped with each other from the front. 343 are superimposed on the corresponding inner connecting terminal portions 320 of the second inner member 300a from the front. The through holes 244, 344 of each second connecting portion 243, 343 are aligned with the through holes 221, 321 of each inner connecting terminal portion 220, 320.

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. do. Further, the terminal main body portion 341 of the second outer member 300b engages with the two claw portions 461 and 462 of the front side surface portion 402. Thereby, the unit consisting of the first outer member 200b and the second outer member 300b is fixed to the case 400.

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

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

FIG. 5 is a diagram schematically showing a state in which the film capacitor 1 is connected to the inverter device 2 and the power supply device 3.

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

In the film capacitor 1, the outer connection terminal section 230 of the first bus bar 200 is connected to the corresponding first external terminal 11, and the power supply device 3 having the same polarity as the outer connection terminal section 230 is connected via the first external terminal 11. It is connected to the side terminal 3a. Further, the outer connection terminal section 330 of the second bus bar 300 is connected to the corresponding first external terminal 12, and a terminal on the power supply device 3 side having the same polarity as the outer connection terminal section 330 is connected via the first external terminal 12. 3b. At this time, the outer connecting terminal portion 230 of the first bus bar 200 and the first external terminal 11 are attached to the first terminal block 420 by screwing to the nut 422 in an overlapping state. Similarly, the outer connecting terminal portion 330 of the second bus bar 300 and the first external terminal 12 are attached to the second terminal block 430 by screwing to the nut 432 in an overlapping state.

Further, in the film capacitor 1, the three inner connection terminal parts 220 of the first bus bar 200 are connected to the corresponding second external terminals 13, and the same as the inner connection terminal parts 220 are connected via the second external terminals 13. It is connected to the terminal 2a on the polar inverter device 2 side. Further, the three inner connection terminal sections 320 of the second bus bar 300 are connected to the corresponding second external terminals 14, and the inverter device 2 of the same polarity as the inner connection terminal sections 320 is connected via the second external terminals 14. It is connected to terminal 2b on the side. At this time, the inner connecting terminal portion 220 of the first inner member 200a, the second connecting portion 243 of the first outer member 200b, and the second external terminal 13 are connected to a screw (not shown) and a nut (not shown). ) is tightened and fixed. Similarly, the inner connecting 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 connected to a screw (not shown) and a nut (not shown). ) is tightened and fixed.

In this way, the connection between the inner connecting terminal portion 220 and the second external terminal 13 and the fixing of the first inner member 200a and the first outer member 200b can be performed by tightening the screws once. Similarly, the connection between the inner connecting terminal portion 320 and the second external terminal 14 and the fixing of the second inner member 300a and the second outer member 300b can be performed by tightening the screws once. Therefore, the number of screws and the screw fastening process can be reduced. Furthermore, it is not necessary to provide the first inner member 200a and the second inner member 300a with a connecting portion for connecting with the second connecting portions 243, 343.

When the electric motor is driven by the inverter device 2 and the film capacitor 1 is energized, in the first bus bar 200, the relay terminal section 240 that forms the path connecting the outer connection terminal section 230 and the inner connection terminal section 220 has a A large DC current may flow due to the power supply device 3. Furthermore, heat generated at the first external terminal 11 due to the large direct current from the power supply device 3 can be transmitted to the relay terminal section 240 via the outer connection terminal section 230 . Similarly, in the second bus bar 300, a large direct current from the power supply device 3 can flow through the relay terminal section 340 that forms a path connecting the outer connection terminal section 330 and the inner connection terminal section 320. Furthermore, heat generated at the first external terminal 12 due to the large direct current from the power supply device 3 can be transmitted to the relay terminal section 340 via the outer connection terminal section 330 .

However, these relay terminal portions 240 and 340 are exposed outside the case 400, particularly outside the filled resin 500. Furthermore, these relay terminal parts 240 and 340 increase the size of the film capacitor 1 as long as the terminal main parts 241 and 341 are along the front side part 402 of the case 400 and do not protrude from the area of the front side part 402. It's hard to let it happen. For this reason, a large area is ensured in the terminal body parts 241, 341 of these relay terminal parts 240, 340. Therefore, these relay terminal parts 240 and 340 have low electrical resistance and good heat dissipation, so even if a large current flows through these relay terminal parts 240 and 340, they do not easily generate heat, and these relay terminal parts 240 , 340, the heat is likely to be released.

Further, in the first bus bar 200 and the second bus bar 300, the terminal body parts 241 and 341 of the relay terminal parts 240 and 340 overlap each other in front of the front side part 402 with the second insulating sheet 700 interposed therebetween. This reduces ESL (equivalent series inductance).

<Effects of the embodiment>
As described above, according to this embodiment, the following effects are achieved.

In the film capacitor 1, the first bus bar 200 and the second bus bar 300 are arranged outside the case 400, and the outside connecting terminal parts 230 and 330 connectable to the first external terminals 11 and 12 are connected to the outside of the case 400. and relay terminal parts 240 and 340 connected to the outer connection terminal parts 230 and 330, and the relay terminal parts 240 and 340 are connected to the front side part 402 of the case 400 so that the surface thereof faces the front side part 402 of the case 400. be followed.

According to this configuration, the relay terminal portions 240, 340 can secure a large area in the portion (terminal main body portions 241, 341) along the front side portion 402 of the case 400, so that the electrical resistance is reduced. , and also improves heat dissipation. Therefore, when current flows through the relay terminal parts 240, 340, the relay terminal parts 240, 340 themselves are less likely to generate heat, and the heat generated at the first external terminals 11, 12 flows through the outer connection terminal parts 230, 330. Even if the heat is transmitted through the relay terminal portions 240 and 340, the heat is likely to be radiated through the relay terminal portions 240 and 340. Therefore, the heat transmitted to the capacitor element 100 through the first bus bar 200 and the second bus bar 300 can be reduced, so that thermal damage to the capacitor element 100 can be made less likely to occur.

Further, the relay terminal portion 240 of the first bus bar 200 and the relay terminal portion 340 of the second bus bar 300 have portions that overlap each other with the second insulating sheet 700 interposed therebetween at the front of the front side surface portion 402.

According to this configuration, it is possible to reduce ESL (equivalent series inductance).

Furthermore, the first bus bar 200 and the second bus bar 300 further include inner connection terminal parts 220 and 320 that are exposed from the filled resin 500 and to which the second external terminals 13 and 14 are connected. The outer connection terminal sections 230 and 330 are connected to the power supply device 3 via the first external terminals 11 and 12, and the inner connection terminal sections 220 and 320 are connected to the inverter device 2 via the second external terminals 13 and 14. be done. The relay terminal sections 240 and 340 constitute a path connecting the outer connection terminal sections 230 and 330 and the inner connection terminal sections 220 and 320.

According to this configuration, even if a large current from the power supply device 3 flows through the relay terminal sections 240, 340, the relay terminal sections 240, 340 themselves are unlikely to generate heat. Further, even if the first external terminals 11 and 12 generate heat due to the large current generated by the power supply device 3 and the heat is transmitted, the heat can be effectively dissipated in the relay terminal sections 240 and 340. Therefore, it is possible to suppress the heat caused by the large current of the power supply device 3 from being transmitted to the capacitor element 100, so that thermal damage to the capacitor element 100 can be made less likely to occur.

Further, the first bus bar 200 includes a first outer member 200b having a relay terminal portion 240 and an outer connecting terminal portion 230, a connecting pin 214 buried in the filling resin 500 and connected to the first end electrode 110, and an inner connecting The first inner member 200a has a terminal portion 220 and is connected to the first outer member 200b. The second bus bar 300 also includes a second outer member 230b having a relay terminal portion 340 and an outer connecting terminal portion 330, a connecting pin 314 buried in the filling resin 500 and connected to the second end electrode 120, and an inner connecting and a second inner member 300a having a terminal portion 320 and connected to the second outer member 300b.

According to the above configuration, after the 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 and the first inner member 200a can be connected, and the second outer member 300b and the second inner member 300a can be connected. This allows the film capacitor 1 to be easily assembled.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and the application examples of the present invention can also be modified in various ways in addition to the above embodiments. It is possible.

For example, in the above embodiment, the first terminal block 420 to which the outer connection terminal part 230 of the first bus bar 200 is attached and the second terminal block 430 to which the outer connection terminal part 330 of the second bus bar 300 is attached are connected to the first bus bar 200 and the relay terminal portions 240, 340 of the second bus bar 300 are provided on a right side surface portion 405 that is different from the front side surface portion 402 along which the relay terminal portions 240, 340 of the second bus bar 300 and the second bus bar 300 are placed. However, as shown in FIG. 6, a first terminal block 420 and a second terminal block 430 are provided on the same front side surface 402 as the side surface along which the relay terminal sections 240, 340 are placed, and these terminal blocks 420, 430 The outer connecting terminal portion 230 of the first bus bar 200 and the outer connecting terminal portion 330 of the second bus bar 300 may be attached to the outer connecting terminal portion 230 of the first bus bar 200 and the outer connecting terminal portion 330 of the second bus bar 300, respectively. In this case, in the relay terminal portions 240, 340, the first connecting portions 242, 342 extend downward from the lower end portions of the terminal body portions 241, 341, and then bend and extend forward. It leads to Further, in the first terminal block 420 and the second terminal block 430, upwardly directed claw parts 423 and 433 engage with the attached outer connection terminal parts 230 and 330, respectively.

Further, the relay terminal portions 240 and 340 of the first bus bar 200 and the second bus bar 300 may be arranged along a side surface of the case 400 other than the front side surface portion 402. In this case, it is desirable that the relay terminal parts 240 and 340 be placed along the rear side part 403, which has a wider area than the left side part 404 and the right side part 405, like the front side part 402.

Furthermore, in the embodiment described above, both the first bus bar 200 and the second bus bar 300 included the relay terminal parts 240 and 340 that extend along the front side surface part 402 of the case 400. However, a configuration may be adopted in which only the first bus bar 200 includes the relay terminal section 240 or only the second bus bar 300 includes the relay terminal section 340.

Furthermore, in the embodiment described above, the second connecting portion 243 of the first outer member 200b is connected to the inner connecting terminal portion 220 of the first inner member 200a, and the second connecting portion 343 of the second outer member 300b is connected to the inner connecting terminal portion 220 of the first inner member 200a. 2 to the inner connecting terminal portion 320 of the inner member 300a. However, the second connecting portion 243 of the first outer member 200b may be connected to a connecting portion separately provided on the first inner member 200a, and the second connecting portion 343 of the second outer member 300b may be connected to a connecting portion separately provided on the first inner member 200a. The member 300a may be connected to a connecting portion provided separately.

Furthermore, in the embodiment described above, the first bus bar 200 is composed of two members, the first inner member 200a and the first outer member 200b, and the second bus bar 300 is composed of the second inner member 300a and the second outer member 300b. It was composed of two members. However, the first bus bar 200 and the second bus bar 300 may be made of one member.

Furthermore, in the embodiment described above, 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 it is one.

Furthermore, in the embodiment described above, the capacitor element 100 is formed by overlapping two metallized films in which aluminum is vapor-deposited on a dielectric film, and then winding or laminating the overlapping metallized films. However, in addition to this, these capacitor elements 100 may be formed by overlapping a metallized film in which aluminum is vapor-deposited on both sides of a dielectric film and an insulating film, and then winding or laminating them.

Furthermore, in the embodiment described above, the film capacitor 1 was mentioned as an example of the capacitor of the present invention. However, the present invention can also be applied to capacitors other than the film capacitor 1.

In addition, the embodiments of the present invention can be appropriately modified in various ways within the scope of the technical idea shown in the claims.

Note that in the description of the above embodiments, terms indicating directions such as "upward" and "downward" indicate relative directions that depend only on the relative positional relationship of the constituent members, and do not refer to the vertical direction or the horizontal direction. It does not indicate an absolute direction.

INDUSTRIAL APPLICABILITY The present invention is useful for capacitors used in various electronic devices, electrical devices, industrial devices, vehicle electrical equipment, and the like.

1 Film capacitor (capacitor)
2 Inverter device (semiconductor device)
3 Power supply device 11 First external terminal 12 First external terminal 13 Second external terminal 14 Second external terminal 100 Capacitor element 110 First end surface electrode (first electrode)
120 Second end electrode (second electrode)
200 First bus bar 200a First inner member (second member)
200b First outer member (first member)
220 Inner connection terminal part (second connection terminal part)
230 Outer connection terminal part (first connection terminal part)
240 Relay terminal section (exposed section)
300 Second 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 part (first connection terminal part)
340 Relay terminal section (exposed section)
400 Case 402 Front side part (side part)
500 Filled resin 700 Second insulation sheet (insulation member)

Claims (2)

a capacitor element having a first electrode and a second electrode;
a case in which the capacitor element is housed;
a first bus bar and a second bus bar connected to the first electrode and the second electrode, respectively;
A filled resin filled in the case,
At least one of the first bus bar and the second bus bar includes a first member and a second member connected to the first member,
The first member is
a first connection terminal portion disposed outside the case and connectable to a first external terminal;
an exposed part that comes out of the case and connects to the first connection terminal part ,
The second member is
a second connection terminal portion exposed from the filled resin and to which a second external terminal is connected;
an electrode connection part embedded in the filling resin and connected to a corresponding electrode of the first electrode and the second electrode,
The first connection terminal section is connected to a power supply device via the first external terminal,
The second connection terminal portion is connected to the semiconductor device via the second external terminal,
The exposed portion is placed along the side surface of the case so that its surface faces the side surface, and forms a path connecting the first connection terminal and the second connection terminal.
A capacitor characterized by: The capacitor according to claim 1,
Both the first bus bar and the second bus bar include the first connection terminal portion and the exposed portion,
The exposed portion of the first bus bar and the exposed portion of the second bus bar have portions that overlap each other with an insulating member in between in front of the side surface portion.
A capacitor characterized by:

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