Capacitor

Abstract

This film capacitor is provided with a capacitor element, a first busbar and a second busbar, and a case including a housing portion housing the capacitor element. The first busbar has an electrode terminal portion and a connection terminal portion, the electrode terminal portion being connected to a first electrode of the capacitor element. The second busbar has an electrode terminal portion and a connection terminal portion, the electrode terminal portion being connected to a second electrode of the capacitor element. The connection terminal portions are located outside the housing portion and each have a protrusion. The case has recesses into which the protrusions are inserted.

Description

[Technical field]

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

[0002] Conventionally, there has been known a capacitor having a configuration in which a bus bar is connected to a capacitor element and which is connected to an external device such as a semiconductor device. An example of such a capacitor is described in Patent Document 1, for example.

[0003] In the film capacitor of Patent Document 1, a protrusion is provided on the case, and a bus bar connected to an electrode of a capacitor element is provided with a fitting hole into which the protrusion of the case fits. The bus bar is positioned and fixed to the case by fitting the protrusion into the fitting hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 016348 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described film capacitor, for example, it may be difficult to provide a fitting hole in the bus bar depending on the shape of the bus bar, etc. In view of this, it has been desired to install the bus bar in the case by a simpler means other than providing a fitting hole in the bus bar.

[0006] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a capacitor in which the bus bar can be easily installed in the case. [Means for solving the problem]

[0007] A main aspect of the present invention relates to a capacitor. The capacitor according to this aspect includes a capacitor element, a bus bar having an electrode terminal portion and a connection terminal portion, the electrode terminal portion being connected to an electrode of the capacitor element, and a case having a housing portion for housing the capacitor element. The connection terminal portion is positioned outside the housing portion, and The case has a flat body extending parallel to the opening of the case, and two ribs extending downward from the left and right sides of the body. Protrusion and and the case comprises: The two are arranged at a predetermined interval. The protrusion is inserted Two It has a recess. Effect of the Invention

[0008] According to the present invention, the bus bar can be easily installed in the case.

[0009] 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]

[0010] [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 a capacitor element unit including a capacitor element, a first bus bar, and a second bus bar according to the embodiment. [Diagram 3] FIG. 3 is an exploded perspective view of a structure including a capacitor element unit, a case, a first terminal, and a second terminal according to the embodiment. [Figure 4] Fig. 4(a) is a perspective view of a structure including a capacitor element unit, a case, a first terminal, and a second terminal according to an embodiment, and Fig. 4(b) is a top view of the vicinity of the left box-shaped part in a state in which the structure is filled with a filling resin according to an embodiment. [Diagram 5]5(a) and 5(b) are cross-sectional views of the vicinity of two recesses formed in the upper surface of the left box-shaped portion according to the embodiment. [Figure 6] 6(a) and 6(b) are cross-sectional views of the vicinity of two recesses formed in the upper surface of the left box-shaped portion according to Modification Example 1. [Figure 7] Fig. 7(a) is a top view of the vicinity of the left box-shaped part according to Modification Example 2. Fig. 7(b) is a top view of the vicinity of the left box-shaped part according to Modification Example 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A film capacitor 1, which is one embodiment of a capacitor according to 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. Furthermore, for convenience, a plane parallel to the front-rear and left-right directions will be referred to as a horizontal plane. Note that the directions shown in the drawings merely indicate relative directions of the film capacitor 1, and do not indicate absolute directions.

[0012] In this embodiment, the film capacitor 1 corresponds to the "capacitor" in the claims. The notch 101a corresponds to the "connection passage" in the claims. The first electrode 210 and the second electrode 220 correspond to the "electrodes" in the claims. The first bus bar 300 and the second bus bar 400 correspond to the "bus bars" in the claims. The first terminal 500 and the second terminal 600 correspond to the "terminals" in the claims. The external connection terminals 510 and 610 correspond to the "one end" in the claims. The connection terminals 520 and 620 correspond to the "other end" in the claims. The filled resin 700 corresponds to the "resin" in the claims.

[0013] 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.

[0014] Fig. 1 is a perspective view of a film capacitor 1. Below, a general configuration of the film capacitor 1 will be described with reference to Fig. 1, and the detailed configuration of each part will be described later with reference to Fig. 2 and subsequent figures.

[0015] The film capacitor 1 includes a case 100, a capacitor element 200, a first bus bar 300, a second bus bar 400, a first terminal 500, a second terminal 600, and a filling resin 700.

[0016] The case 100 is formed in a substantially rectangular box shape, and includes an accommodation portion 101 with an open top. The accommodation portion 101 accommodates the capacitor element 200. The left and right outer surfaces of the case 100 are provided with mounting tabs 110, respectively. The mounting tabs 110 are formed with holes 111 penetrating in the front-to-rear direction, and metal collars 112 are fitted into the holes 111 to increase the strength of the holes. Similarly to the outer surfaces, mounting tabs are also provided on the outer bottom surface of the case 100, and metal collars are fitted into the holes of the mounting tabs. When the film capacitor 1 is installed in an installation portion of an external device, these mounting tabs are fixed to the installation portion with screws or the like.

[0017] Furthermore, two box-shaped portions 120 are provided side by side on the front surface of the case 100 with a gap therebetween in the left-right direction. A first terminal 500 and a second terminal 600 are respectively provided in the left and right box-shaped portions 120 by insert molding when the case 100 is molded. Terminals of external devices are connected to the external connection terminal portion 510 of the first terminal 500 and the external connection terminal portion 610 of the second terminal 600. Two recesses 800 extending in the front-rear direction are provided side by side on the upper surface of the box-shaped portion 120 with a gap therebetween in the left-right direction.

[0018] First bus bar 300 and second bus bar 400 are respectively installed on the upper and lower surfaces of capacitor element 200. External connection terminal portion 310 of first bus bar 300 and external connection terminal portion 410 of second bus bar 400 each extend upward and are positioned outside accommodating portion 101. Terminals of an external device are connected to external connection terminal portions 310, 410, respectively.

[0019] The connection terminal portion 320 of the first bus bar 300 and the connection terminal portion 420 of the second bus bar 400 are positioned outside the accommodating portion 101 and are connected to the connection terminal portion 520 at the upper end of the first terminal 500 and the connection terminal portion 620 at the upper end of the second terminal 600, respectively, by a joining method such as soldering.

[0020] Filling resin 700 is a thermosetting resin such as epoxy resin, which is injected in a liquid state into accommodation portion 101 of case 100 while capacitor element 200 is accommodated in the accommodation portion 101, and then hardens when case 100 is heated. Filling resin 700 protects first bus bar 300 and second bus bar 400 in accommodation portion 101 and capacitor element 200 from moisture and impact.

[0021] Next, with reference to Figs. 2 to 4(b), a detailed configuration of each part and an assembly procedure for the film capacitor 1 will be described.

[0022] FIG. 2 is an exploded perspective view of capacitor element unit 1a constituted by capacitor element 200, first bus bar 300 and second bus bar 400. As shown in FIG.

[0023] First bus bar 300 is composed of external connection terminal portion 310, connection terminal portion 320, and electrode terminal portion 330. First bus bar 300 is formed by appropriately processing, such as bending, a metal plate (e.g., a copper plate) that is a conductive material having a predetermined shape.

[0024] The electrode terminal portion 330 has a flat plate shape parallel to a horizontal plane. The external connection terminal portion 310 has a flat plate shape and extends upward from the rear end of the electrode terminal portion 330. The external connection terminal portion 310 has a mounting hole 311 that penetrates the external connection terminal portion 310 in the front-rear direction. After the assembly of the film capacitor 1 is completed, a terminal of an external device is connected to the external connection terminal portion 310 by screwing using the mounting hole 311.

[0025] A flat plate-shaped connecting portion 331 extending upward is formed near the left end of the front end of the electrode terminal portion 330. The left-right width of the connecting portion 331 is narrower than the left-right width of the external connection terminal portion 310.

[0026] The connection terminal portion 320 has a flat plate shape parallel to the horizontal plane and extends forward from the upper end of the connection portion 331. The connection terminal portion 320 has a main body portion 320a having the same width as the connection portion 331 in the left-right direction. A flange portion 320b extending slightly outward in the left-right direction is formed at the left and right ends of the main body portion 320a, and a flat plate-shaped protrusion portion 321 extending downward is formed at the outer end of the flange portion 320b. The left and right protrusion portions 321 are formed symmetrically with respect to the center of the main body portion 320a. The protrusion portion 321 is formed by bending a part of the connection terminal portion 320 parallel to the horizontal plane downward. The left and right side surfaces of the protrusion portion 321 have a rectangular shape.

[0027] A connection hole 322 is formed near the front end of the connection terminal portion 320, penetrating the connection terminal portion 320 in the vertical direction. As described below, the connection terminal portion 520 (see FIG. 3) at the upper end of the first terminal 500 is connected to the connection hole 322 by a joining method such as soldering.

[0028] Second bus bar 400 has substantially the same configuration as first bus bar 300, and is composed of external connection terminal portion 410, connection terminal portion 420, and electrode terminal portion 430. Second bus bar 400 is formed by appropriately processing a metal plate (e.g., a copper plate) made of a conductive material having a predetermined shape, such as by bending it.

[0029] The electrode terminal portion 430 has a flat plate shape parallel to a horizontal plane. The external connection terminal portion 410 has a flat plate shape and extends upward from the rear end of the electrode terminal portion 430. The vertical length of the external connection terminal portion 410 is longer than the vertical length of the external connection terminal portion 310, and the horizontal width of the external connection terminal portion 410 is equal to the horizontal width of the external connection terminal portion 310. The external connection terminal portion 410 has a mounting hole 411 that penetrates the external connection terminal portion 410 in the front-rear direction. After the assembly of the film capacitor 1 is completed, a terminal of an external device is connected to the external connection terminal portion 410 by screwing using the mounting hole 411.

[0030] A flat-plate-shaped connecting portion 431 extending upward is formed near the right end of the front end of the electrode terminal portion 430. The left-right width of the connecting portion 431 is narrower than the left-right width of the external connecting terminal portion 410 and is equal to the left-right width of the connecting portion 331. The vertical length of the connecting portion 431 is longer than the vertical length of the connecting portion 331.

[0031] The connection terminal portion 420 has a flat plate shape parallel to the horizontal plane and extends forward from the upper end of the connection portion 431. The connection terminal portion 420 has a main body portion 420a having the same width as the connection portion 431 in the left-right direction. A flange portion 420b extending slightly outward in the left-right direction is formed at the left and right ends of the main body portion 420a, and a flat plate-shaped protrusion portion 421 extending downward is formed at the outer end of the flange portion 420b. The left and right protrusion portions 421 are formed symmetrically with respect to the center of the main body portion 420a. The protrusion portion 421 is formed by bending a part of the connection terminal portion 420 parallel to the horizontal plane downward. The left and right side surfaces of the protrusion portion 421 have a rectangular shape.

[0032] A connection hole 422 is formed near the front end of the connection terminal portion 420, penetrating the connection terminal portion 420 in the vertical direction. As described below, the connection terminal portion 620 (see FIG. 3) at the upper end of the second terminal 600 is connected to the connection hole 422 by a joining method such as soldering.

[0033] Capacitor element 200 is formed by stacking two metallized films, each having aluminum evaporated onto a dielectric film, rolling or laminating the stacked metallized films, and pressing them into a flat shape. Capacitor element 200 has first electrode 210 formed on the upper surface and second electrode 220 formed on the lower surface by spraying a metal such as zinc.

[0034] Although capacitor element 200 in 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 200 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.

[0035] During assembly, the lower surface of the electrode terminal portion 330 of the first bus bar 300 is joined to the first electrode 210 on the upper surface of the capacitor element 200 by a joining method such as soldering. As a result, the first bus bar 300 is electrically connected to the first electrode 210. Similarly, the upper surface of the electrode terminal portion 430 of the second bus bar 400 is connected to the second electrode 220 on the lower surface of the capacitor element 200 by a joining method such as soldering. As a result, the second bus bar 400 is electrically connected to the second electrode 220. Note that pin-shaped terminals may be formed on the electrode terminal portions 330, 430, and these terminals may be joined to the first electrode 210 and the second electrode 220 by soldering or the like. In this manner, the capacitor element unit 1a is completed as shown in FIG. 3.

[0036] FIG. 3 is an exploded perspective view of a structure 1b constituted by the capacitor element unit 1a, the case 100, the first terminal 500 and the second terminal 600. As shown in FIG.

[0037] The case 100 is made of resin, for example, polyphenylene sulfide (PPS) which is a thermoplastic resin. The two box-shaped parts 120 are provided side by side on the front surface of the case 100 with a gap therebetween in the left-right direction. The box-shaped part 120 has a surface protruding forward from the front surface of the case 100 and a surface protruding rearward from the front surface of the storage part 101. Two recesses 800 are formed on the top surface 121 of the box-shaped part 120 and are arranged side by side with a predetermined gap therebetween in the left-right direction. The recesses 800 extend in the front-rear direction and are recessed downward from the top surface 121. In the left-right direction, the distance between the centers of two adjacent recesses 800 is equal to the distance between the centers of the two protrusions 321 of the first bus bar 300 and the distance between the centers of the two protrusions 421 of the second bus bar 400.

[0038] The first terminal 500 is composed of an external connection terminal portion 510, a connection terminal portion 520, and connection portions 531 and 532. The first terminal 500 is formed by appropriately bending or otherwise processing a metal plate (for example, a copper plate) of a predetermined shape, which is a conductive material, in the same manner as the first bus bar 300. In the left-right direction, the width of the connection portions 531 and 532 is approximately equal to the width of the main body portion 320a of the first bus bar 300. The connection portions 531 and 532 are connected to each other, the connection portion 531 has a flat plate shape parallel to a horizontal plane, and the connection portion 532 has a flat plate shape parallel to the left-right direction and the up-down direction. The external connection terminal portion 510 has a pin shape and protrudes forward from the front end of the connection portion 531. The connection terminal portion 520 has a pin shape and protrudes upward from the upper end of the connection portion 532.

[0039] The first terminal 500 is installed in the left box-shaped portion 120 by insert molding when the case 100 is molded. As a result, parts of the connection portions 531, 532 are embedded in the box-shaped portion 120, and the external connection terminal portion 510 and the connection terminal portion 520 are positioned outside the box-shaped portion 120. After the assembly of the film capacitor 1 is completed, a terminal of an external device is connected to the external connection terminal portion 510 by a joining method such as soldering.

[0040] The second terminal 600 is configured similarly to the first terminal 500, and is configured with an external connection terminal portion 610, a connection terminal portion 520, and connection portions 631 and 632. In the left-right direction, the width of the connection portions 631 and 632 is approximately equal to the width of the main body portion 420a of the second bus bar 400. The second terminal 600 is installed in the right box-shaped portion 120 by insert molding when the case 100 is molded. As a result, parts of the connection portions 631 and 632 are embedded in the box-shaped portion 120, and the external connection terminal portion 610 and the connection terminal portion 620 are positioned outside the box-shaped portion 120. After the assembly of the film capacitor 1 is completed, a terminal of an external device is connected to the external connection terminal portion 610 by a joining method such as soldering.

[0041] During assembly, capacitor element unit 1a is accommodated in accommodation portion 101 from above case 100. At this time, two protrusions 321 of first bus bar 300 are inserted into two recesses 800 formed in upper surface 121 of left box-shaped portion 120, respectively, and two protrusions 421 of second bus bar 400 are inserted into two recesses 800 formed in upper surface 121 of right box-shaped portion 120, respectively. When protrusions 321, 421 are inserted into recesses 800, connection terminal portion 520 is inserted into connection hole 322 of first bus bar 300, and connection terminal portion 620 is inserted into connection hole 422 of second bus bar 400. Then, connection hole 322 and connection terminal portion 520 are connected by a joining method such as soldering, and connection hole 422 and connection terminal portion 620 are connected by a joining method such as soldering. In this way, the structure 1b is completed as shown in FIG.

[0042] The connection between the connection hole 322 and the connection terminal portion 520 and the connection between the connection hole 422 and the connection terminal portion 620 may be performed after filling and curing of the filling resin 700 described with reference to FIG. 4(a).

[0043] Fig. 4(a) is a perspective view of the structure 1b, and Fig. 4(b) is a top view of the vicinity of the left box-shaped portion 120 in a state in which the filled resin 700 has been filled into the structure 1b.

[0044] As shown in FIG. 4(a), after the capacitor element unit 1a is accommodated in the accommodating portion 101, a filling resin 700 is injected in a liquid phase state between the inner wall of the accommodating portion 101 and the capacitor element 200. When the accommodating portion 101 is filled with the filling resin 700 up to the vicinity of the upper surface of the case 100, as shown in FIG. 4(b), the accommodating portion 101 is filled with the filling resin 700.

[0045] Here, a notch 101a is formed by cutting out the upper surface 121 of the box-shaped portion 120 between the recess 800 and the accommodating portion 101. Thereby, when the accommodating portion 101 is filled with the filling resin 700, the recess 800 communicating with the accommodating portion 101 is also filled with the filling resin 700 through the notch 101a. Then, when the case 100 is heated, the filling resin 700 in the accommodating portion 101 and the recess 800 hardens.

[0046] In addition, in FIG. 4(b), the vicinity of the left box-shaped portion 120 is shown, but the vicinity of the right box-shaped portion 120 has the same configuration. That is, a notch 101a is also formed between the recess 800 and the accommodating portion 101 on the upper surface 121 of the right box-shaped portion 120, and the two recesses 800 of the right box-shaped portion 120 are filled with the filling resin 700 through the notch 101a.

[0047] In this way, the film capacitor 1 shown in FIG. 1 is completed.

[0048] FIGS. 5(a) and 5(b) are cross-sectional views in the vicinity of the two recesses 800 formed in the upper surface 121 of the left box-shaped portion 120.

[0049] Fig. 5(a) is a cross-sectional view seen from the front, showing a cut surface of film capacitor 1 cut along a plane parallel to the up-down and left-right directions passing through the center in the front-rear direction of protrusion 321. Fig. 5(b) is a cross-sectional view seen from the right, showing a cut surface of film capacitor 1 cut along a plane parallel to the up-down and front-rear directions passing through the center in the left-right direction of right-side protrusion 321. The cross-sectional configuration shown in Fig. 5(a) is the same for the box-shaped portion 120 on the right side, and the cross-sectional configuration shown in Fig. 5(b) is the same for protrusion 321 and two protrusions 421 on the left side.

[0050] 5(a), recess 800 includes bottom surface 810 parallel to a horizontal plane, inclined surface 821 formed near the upper end of recess 800, and side surface 822 formed near the lower end of recess 800. Due to inclined surface 821 being formed on the inner surface of recess 800, the width of recess 800 in the horizontal plane narrows from the upper end toward the bottom.

[0051] 4(b), a notch 101a is formed between the rear end of the recess 800 and the storage portion 101. The notch 101a is a connection passage that connects the inside of the recess 800 and the inside of the storage portion 101. By forming the notch 101a, when the filling resin 700 is injected into the storage portion 101 in a liquid phase, the filling resin 700 in the storage portion 101 flows into the recess 800 through the notch 101a.

[0052] As shown in FIG. 5(b), recess 800 includes an inclined surface 831 formed below notch 101a from the lower end of notch 101a downward, and a side surface 832 formed near the lower end of recess 800. By forming inclined surface 831 below notch 101a, the width of recess 800 in the horizontal plane narrows as it moves downward from the lower end of notch 101a. By forming inclined surfaces 821 and 831, as shown in FIG. 3, when capacitor element unit 1a is accommodated in accommodation portion 101 of case 100, protrusions 321 and 421 can be smoothly inserted into recess 800. This allows connection terminal portion 520 to be smoothly inserted into connection hole 322 of first bus bar 300, and connection terminal portion 620 to be smoothly inserted into connection hole 422 of second bus bar 400.

[0053] Next, with reference to FIG. 1, a connection between the film capacitor 1 and an external device will be described.

[0054] The film capacitor 1 is mounted, for example, in an inverter device for driving an electric motor in an electric vehicle. The inverter device is supplied with DC power from a power supply device (battery). The inverter device includes an inverter circuit including an IGBT (Insulated Gate Bipolar Transistor), converts the DC power into three-phase AC power, and supplies it to the electric motor.

[0055] External terminals of corresponding external devices (power supply devices and inverter devices) are connected to external connection terminal portions 310 of first bus bar 300 by screwing using mounting holes 311. Similarly, external terminals of corresponding external devices (power supply devices and power motors) are connected to external connection terminal portions 410 of second bus bar 400 by screwing using mounting holes 411.

[0056] Furthermore, an external terminal of an external device for monitoring the voltage value of capacitor element 200 is connected to external connection terminal portion 510 of first terminal 500 and external connection terminal portion 610 of second terminal 600 by a joining method such as soldering. When a current is applied to film capacitor 1, the voltage of capacitor element 200 is output as a voltage signal from external connection terminal portions 510, 610, which are signal output terminals, to the external device via connection terminal portions 320, 420. This makes it possible for a monitoring device included in the external device for monitoring the voltage signal to detect and monitor the voltage of capacitor element 200.

[0057] <Effects of the embodiment> As described above, according to the present embodiment, the following effects are achieved.

[0058] The first bus bar 300 includes an electrode terminal portion 330 and a connection terminal portion 320, and the electrode terminal portion 330 is connected to the first electrode 210 of the capacitor element 200. The second bus bar 400 includes an electrode terminal portion 430 and a connection terminal portion 420, and the electrode terminal portion 430 is connected to the second electrode 220 of the capacitor element 200. The connection terminal portion 320 is positioned outside (above) the accommodating portion 101 and has a protrusion 321. The connection terminal portion 420 is positioned outside (above) the accommodating portion 101 and has a protrusion 421. The case 100 has a recess 800 into which the protrusions 321, 421 are inserted.

[0059] According to this configuration, first bus bar 300 and second bus bar 400 can be installed on case 100 by inserting protrusions 321, 421 into recess 800. This allows first bus bar 300 and second bus bar 400 to be easily installed on case 100.

[0060] Here, in this embodiment, the connection terminal portion 320 of the first bus bar 300 and the connection terminal portion 420 of the second bus bar 400 are provided to relay a voltage value to an external device for monitoring the voltage value of the capacitor element 200. Therefore, the main body portions 320a, 420a (see FIG. 2) of this embodiment are configured to have a narrow width in the left-right direction. When the width of the main body portions 320a, 420a in the left-right direction is narrowed in this manner, it becomes difficult to provide fitting holes in the main body portions 320a, 420a for installing the connection terminal portions 320, 420 in the case 100. In contrast, in this embodiment, the protrusions 321 are provided on the left and right of the connection terminal portion 320, and the protrusions 421 are provided on the left and right of the connection terminal portion 420. As a result, even if the width of the main body portions 320a, 420a in the left-right direction is narrow, the connection terminal portions 320, 420 can be installed in the case 100 by inserting the protrusions 321, 421 into the recesses 800.

[0061] In addition, if the main body parts 320a, 420a are configured to have a wider width in the left-right direction in order to suppress an increase in electrical resistance, providing fitting holes in the main body parts 320a, 420a will increase the electrical resistance. Therefore, in this case as well, it is difficult to provide fitting holes in the main body parts 320a, 420a. In contrast, according to this embodiment, the connection terminal parts 320, 420 are provided with the protrusions 321, 421, respectively, so that the connection terminal parts 320, 420 can be installed in the case 100 while suppressing an increase in electrical resistance.

[0062] The protrusion 321 is formed by bending a part of the connection terminal portion 320, and the protrusion 421 is formed by bending a part of the connection terminal portion 420.

[0063] According to this configuration, even if the width of connection terminal portions 320, 420 is narrow, protrusions 321 can be easily formed on first bus bar 300, and protrusions 421 can be easily formed on second bus bar 400.

[0064] The recess 800 has inclined surfaces 821, 831 such that the width of the recess 800 narrows from the upper end (entrance) toward the lower end (interior).

[0065] According to this configuration, the protrusions 321 and 421 can be smoothly inserted into the recess 800 along the inclined surfaces 821 and 831 .

[0066] The first terminal 500 is insert molded into the case 100, and the external connection terminal portion 510 (one end of the first terminal 500) is drawn out to the outside. The second terminal 600 is insert molded into the case 100, and the external connection terminal portion 610 (one end of the second terminal 600) is drawn out to the outside. The connection terminal portion 320 of the first bus bar 300 is configured to be positioned at a position connectable to the connection terminal portion 520 (the other end of the first terminal 500) when the protrusion 321 is inserted into the recess 800. The connection terminal portion 420 of the second bus bar 400 is configured to be positioned at a position connectable to the connection terminal portion 620 (the other end of the second terminal 600) when the protrusion 421 is inserted into the recess 800.

[0067] According to this configuration, by inserting protrusions 321, 421 into recesses 800 and installing first busbar 300 and second busbar 400 relative to case 100, the positions of connection terminal portion 320 of first busbar 300 and connection terminal portion 520 of first terminal 500 can be aligned, and the positions of connection terminal portion 420 of second busbar 400 and connection terminal portion 620 of second terminal 600 can be aligned. This allows smooth connection between first busbar 300 and first terminal 500 and connection between second busbar 400 and second terminal 600.

[0068] Connection terminal portion 320 of first bus bar 300 has connection hole 322 into which connection terminal portion 520 of first terminal 500 can be inserted, and connection terminal portion 420 of second bus bar 400 has connection hole 422 into which connection terminal portion 620 of second terminal 600 can be inserted. Connection hole 322 is provided at a position into which connection terminal portion 520 (the other end of first terminal 500) is inserted when protrusion 321 is inserted into recess 800, and connection hole 422 is provided at a position into which connection terminal portion 620 (the other end of second terminal 600) is inserted when protrusion 421 is inserted into recess 800.

[0069] According to this configuration, by inserting protrusions 321, 421 into recess 800 and placing first bus bar 300 and second bus bar 400 relative to case 100, the positions of connection hole 322 and connection terminal portion 520 can be aligned, and the positions of connection hole 422 and connection terminal portion 620 can be aligned. Thus, the connection between first bus bar 300 and first terminal 500 and the connection between second bus bar 400 and second terminal 600 can be reliably and smoothly performed.

[0070] The protrusion 321 is fixed to the recess 800 by filling the space between the protrusion 321 and the recess 800 with filling resin 700, and the protrusion 421 is fixed to the recess 800 by filling the space between the protrusion 421 and the recess 800 with filling resin 700.

[0071] According to this configuration, first bus bar 300 and second bus bar 400 can be reliably fixed to case 100.

[0072] Case 100 has accommodation portion 101 that accommodates capacitor element 200 and notch 101a (connection passage) that connects recess 800. Protrusions 321, 421 are fixed to recess 800 by filling resin 700 filled between capacitor element 200 and accommodation portion 101 filling recess 800 through notch 101a.

[0073] According to this configuration, by filling accommodation portion 101 with filling resin 700, recess 800 can also be filled with filling resin 700, so that fixing of capacitor element 200 to accommodation portion 101 and fixing of protrusions 321, 421 to recess 800 can be smoothly performed.

[0074] 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.

[0075] <Change Example 1> In the above embodiment, the recess 800 is provided with the inclined surfaces 821, 831, but in the first modification, the protrusions 321, 421 are provided with inclined surfaces.

[0076] 6(a) and (b) are cross-sectional views of the vicinity of the recess 800 formed in the upper surface 121 of the left box-shaped portion 120 according to Modification Example 1. Figures 6(a) and (b) are cross-sectional views similar to Figures 5(a) and (b), respectively.

[0077] In the first modification, as shown in FIG. 6(a), inclined surfaces 321a are formed on the left and right side surfaces of the protrusion 321, and as shown in FIG. 6(b), inclined surfaces 321b are formed on the front and rear side surfaces of the protrusion 321. As a result, the cross section of the protrusion 321 provided on the connection terminal portion 320 is configured so that the width in the left and right direction and the front and rear direction decreases as it goes downward. Also, compared to the above embodiment, the inclined surfaces are omitted from the side surface of the recess 800, and the side surfaces 822, 832 extend upward. In the first modification, the two protrusions 421 and the two recesses 800 corresponding to the two protrusions 421 are also configured in the same manner as in FIGS. 6(a) and 6(b).

[0078] In the first modified example, the protrusions 321, 421 also have an inclined surface, so that the width of the protrusions 321, 421 narrows from the upper end toward the lower end. This allows the protrusions 321, 421 to be smoothly inserted into the recess 800.

[0079] In the above embodiment and modified example 1, an inclined surface is provided on either the protrusions 321, 421 or the recess 800, but an inclined surface may be provided on both. Also, instead of the inclined surfaces provided on the protrusions 321, 421 and the recess 800, a surface having a stepped cross section may be formed so that the width gradually narrows downward.

[0080] <Change Example 2> In the above embodiment, as shown in Fig. 2, the flat plate portion extending in the left-right direction from the main body portion 320a, 420a is bent downward to form the flange portion 320b, 420b and the protrusions 321, 421. In contrast, in the second modification, the flange portion 320b, 420b is omitted, and the separate protrusions 321, 421 are joined to the lower surface of the main body portion 320a, 420a by welding or the like.

[0081] 7(a) is a top view of the vicinity of the left box-shaped portion 120 according to Modification Example 2. Note that the configuration of the vicinity of the right box-shaped portion 120 is similar, so hereinafter, only the configuration of the vicinity of the left box-shaped portion 120 will be described.

[0082] 7(a), in Modification Example 2, two protrusions 321 are formed at an interval on the lower surface of main body 320a of connection terminal portion 320. As a result, the distance between the centers of two protrusions 321 in the left-right direction is shorter than in the above embodiment. Therefore, in Modification Example 2, two recesses 800 are formed on upper surface 121 of left box-shaped portion 120 so that the distance between the centers of two recesses 800 is shorter than in the above embodiment.

[0083] In the second modification as well, first bus bar 300 and second bus bar 400 can be installed in case 100 by inserting protrusions 321 , 421 into recesses 800 .

[0084] In addition, in the second modification, it is necessary to join the protrusions 321, 421 to the lower surfaces of the main bodies 320a, 420a by welding or the like. Therefore, in order to form the protrusions 321, 421 more simply, it is preferable to form the protrusions 321, 421 by bending a part of the connection terminals 320, 420 as in the above embodiment.

[0085] <Change Example 3> In the above embodiment, the connection terminal portion 320 is installed on the case 100 by inserting the two protrusions 321 into the two recesses 800, but in the third modification, the connection terminal portion 320 is installed on the case 100 by inserting the three protrusions into the three recesses. Similarly, the connection terminal portion 420 is installed on the case 100 by inserting the three protrusions into the three recesses.

[0086] 7(b) is a top view of the vicinity of the left box-shaped portion 120 according to Modification Example 3. Note that the configuration of the vicinity of the right box-shaped portion 120 is similar, so hereinafter, only the configuration of the vicinity of the left box-shaped portion 120 will be described.

[0087] As shown in FIG. 7(b), in Modification Example 3, a protrusion 323 is further formed between the two protrusions 321 and the connection hole 322. The protrusion 323 is joined to the lower surface of the main body 320a by welding or the like. The protrusion 323 has a shape similar to that of the protrusion 321, and has surfaces parallel to the up-down and left-right directions. In Modification Example 3, a recess 900 is formed in the upper surface 121 of the box-shaped portion 120 below the protrusion 323. The recess 900 has a shape similar to that of the recess 800.

[0088] During assembly, the two protrusions 321 are inserted into the two recesses 800, and the protrusion 323 is inserted into the recess 900. Thereafter, the containing portion 101 is filled with the filled resin 700, thereby filling the containing portion 101 and the recess 800 with the filled resin 700. In addition, the recess 900 is also separately filled with the filled resin 700.

[0089] According to Modification Example 3, by inserting two protrusions 321 into two recesses 800 and further inserting protrusion 323 into recess 900, first bus bar 300 can be installed even more firmly relative to case 100. Similarly, for right box-shaped portion 120, by inserting three protrusions into three recesses, second bus bar 400 can be installed even more firmly relative to case 100.

[0090] In addition, in the third modification, since the recess 900 is not connected to the storage portion 101, it is necessary to fill the recess 900 with the filling resin 700 separately when fixing the protrusion 323. Therefore, in the third modification, a notch that connects the recess 900 and the recess 800 may be provided so that the filling resin 700 is filled in the recess 900 in accordance with the filling of the storage portion 101 with the filling resin 700.

[0091] Furthermore, first busbar 300 and second busbar 400 may be installed in case 100 by four or more protrusions and the same number of recesses as the protrusions. Furthermore, first busbar 300 and second busbar 400 may be installed in case 100 by one protrusion and one recess. However, in order to stably install first busbar 300 and second busbar 400, it is preferable to provide multiple protrusions and the same number of recesses as the protrusions.

[0092] <Other changes> In the above embodiment, protrusions 321, 421 and recesses 800 are provided on the connection terminal portion 320 side of first bus bar 300 and the connection terminal portion 420 side of second bus bar 400. However, the configuration of the protrusions and recesses is not limited to being provided on the connection terminal portions 320, 420 side, and may be provided on the external connection terminal portions 310, 410 side. In this manner, the protrusions and recesses for fixing first bus bar 300 and second bus bar 400 to case 100 may be provided not only on the connection terminal portions 320, 420 that are narrow in the left-right direction, but also on the external connection terminal portions 310, 410 that are wide in the left-right direction.

[0093] In the above embodiment, protrusions 321, 421 and recess 800 are configured so that the width of protrusions 321, 421 is smaller than the width of recess 800 in a direction parallel to the horizontal plane. However, this is not limited thereto, and the width of protrusions 321, 421 may be substantially the same as the width of recess 800 in a direction parallel to the horizontal plane. In this case, fixing of first bus bar 300 and second bus bar 400 to case 100 is completed by fitting protrusions 321, 421 into recess 800.

[0094] However, depending on manufacturing errors of the protrusions 321, 421 and the recess 800, it is conceivable that the protrusions 321, 421 may not fit into the recess 800, or that a larger gap than necessary may be generated between the protrusions 321, 421 and the recess 800. Therefore, in order to smoothly insert the protrusions 321, 421 into the recess 800 and to reliably fix the protrusions 321, 421, it is preferable to provide a gap between the protrusions 321, 421 and the recess 800, fill the gap with the filling resin 700, and fix the protrusions 321, 421 to the recess 800, as in the above embodiment.

[0095] In the above embodiment, first busbar 300 is provided with external connection terminal portion 310 for connection to an external device (power supply device and inverter device), and connection terminal portion 320 for connection to an external device that monitors the voltage value of capacitor element 200, at electrode terminal portion 330. However, this is not limited to the above, and instead of first busbar 300, a main busbar including external connection terminal portion 310 for connection to an external device (power supply device and inverter device) and an electrode terminal portion, and a sub-busbar including connection terminal portion 320 for connection to an external device that monitors the voltage value of capacitor element 200 and an electrode terminal portion may be used. Similarly, instead of second busbar 400, a main busbar and a sub-busbar may be used.

[0096] When a main busbar and a sub-busbar are used instead of the first busbar 300, configurations similar to the protrusions 321 and recesses 800 may be provided not only on the sub-busbar side but also on the main busbar side. Similarly, when a main busbar and a sub-busbar are used instead of the second busbar 400, configurations similar to the protrusions 421 and recesses 800 may be provided not only on the sub-busbar side but also on the main busbar side.

[0097] In the above embodiment, each portion of first busbar 300 is formed by bending or other processing, but this is not limiting, and for example, first busbar 300 may be formed by joining together flat plates for forming external connection terminal portion 310, connection terminal portion 320, and electrode terminal portion 330 by welding. Similarly, second busbar 400 may be formed by joining together flat plates for forming external connection terminal portion 410, connection terminal portion 420, and electrode terminal portion 430 by welding.

[0098] 2, the protrusions 321, 421 are formed by bending a part of the connection terminals 320, 420, respectively, but this is not limiting, and flat plates for forming the protrusions 321, 421 may be joined by welding to the lower surfaces of the flanges 320b, 420b, respectively. However, the protrusions 321, 421 can be formed more easily by bending a part of the connection terminals 320, 420 as in the above embodiment.

[0099] In the above embodiment, the connection hole 322 is provided in the connection terminal portion 320, the connection terminal portion 520 of the first terminal 500 is passed through the connection hole 322, and the connection hole 322 and the connection terminal portion 520 are connected by a joining method such as soldering. However, this is not limited to this, and instead of the connection hole 322, a surface parallel to the left-right direction and the up-down direction may be formed at the front end portion of the main body portion 320a of the connection terminal portion 320. In this case, the surface of the front end portion of the main body portion 320a and the surface of the connection terminal portion 520 are connected by spot welding. Similarly, for the connection terminal portion 420, a surface formed at the front end portion of the main body portion 420a of the connection terminal portion 420 and a surface of the connection terminal portion 620 may be connected by spot welding.

[0100] In the above embodiment, notch 101a is formed between storage portion 101 and recess 800 as a connecting passage connecting storage portion 101 and recess 800, but this is not limited thereto, and a connecting passage that is not open upward, i.e., a connecting passage that passes through the inside of case 100, may be formed between storage portion 101 and recess 800.

[0101] In the above embodiment, the film capacitor 1 is provided with one capacitor element 200. However, the number of capacitor elements 200 may be two or more, and may be changed as appropriate.

[0102] In the above embodiment, capacitor element 200 is formed by stacking two metallized films having aluminum vapor-deposited on a dielectric film, and then rolling or laminating the stacked metallized films. However, capacitor elements 200 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 then rolling or laminating the resulting film.

[0103] 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.

[0104] 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.

[0105] 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]

[0106] 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]

[0107] 1. Film capacitor (capacitor) 100 cases 101 Storage unit 101a Notch (connecting passage) 200 Capacitor element 210 1st electrode (electrode) 220 Second electrode (electrode) 300 1st bus bar (bus bar) 320 Connection terminal 321 Protrusion 322 Connection hole 323 Protrusion 330 Electrode terminal section 400 2nd bus bar (bus bar) 420 Connection terminal 421 Protrusion 422 Connection hole 430 Electrode terminal section 500 1st terminal (terminal) 510 External connection terminal (one end) 520 Connection terminal part (other end) 600 2nd terminal (terminal) 610 External connection terminal (one end) 620 Connection terminal part (other end) 700 Filled Resin (Resin) 800, 900 recess

Claims

1. A capacitor element; a bus bar including an electrode terminal portion and a connection terminal portion, the electrode terminal portion being connected to an electrode of the capacitor element; a case having a housing portion that houses the capacitor element, the connection terminal portion is positioned outside the housing portion and has a flat body portion extending parallel to an opening surface of the case, and two protrusions extending downward from both left and right sides of the body portion; The case has two recesses arranged at a predetermined interval and into which the two protrusions are inserted. A capacitor characterized by:

2. 2. The capacitor according to claim 1, The protrusion is formed by bending a part of the connection terminal. A capacitor characterized by:

3. The capacitor according to claim 1 or 2, The recess has an inclined surface such that the width of the recess narrows from the inlet toward the inside. A capacitor characterized by:

4. The capacitor according to any one of claims 1 to 3, A terminal is provided which is insert-molded into the case and has one end extending to the outside, The connection terminal portion is configured to be positioned at a position connectable to the other end of the terminal when the protrusion is inserted into the recess. A capacitor characterized by:

5. 5. The capacitor according to claim 4, the connection terminal portion has a connection hole into which the other end of the terminal can be inserted, the connection hole is provided at a position into which the other end of the terminal is inserted when the protrusion is inserted into the recess; A capacitor characterized by:

6. The capacitor according to any one of claims 1 to 5, The protrusion is fixed to the recess by filling a gap between the protrusion and the recess with resin. A capacitor characterized by:

7. 7. The capacitor according to claim 6, the case includes a connection passage that connects the storage portion and the recess, the resin filled between the capacitor element and the housing is filled into the recess through the connection passage, whereby the protrusion is fixed to the recess. A capacitor characterized by:

8. A capacitor element; a bus bar including an electrode terminal portion and a connection terminal portion, the electrode terminal portion being connected to an electrode of the capacitor element; a case having a housing portion for housing the capacitor element; a terminal embedded in the case and having one end extended to the outside, the connection terminal portion is positioned outside the housing portion and has a protrusion, the case has a recess into which the protrusion is inserted, The connection terminal portion is configured to be positioned at a position connectable to the other end of the terminal when the protrusion is inserted into the recess. A capacitor characterized by:

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