Capacitor Module

Abstract

This capacitor module comprises: a case in which an opening is formed at a position facing the bottom surface, and a through-hole is formed in the side surface; a sealing resin filled into the case; one or a plurality of capacitors accommodated in the case; a capacitor connection bus bar connected to an electrode of the capacitor; and a terminal bus bar that is positioned in the through-hole, a first end of which is positioned inside the case, a second end of which is positioned outside the case, and the first end being connected to the capacitor connection bus bar. The capacitor connection bus bar has a connection part, at least a portion of which inclines toward the bottom surface from the opening of the case and connects with the first end of the terminal bus bar.

Description

[Technical field]

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

[0002] A capacitor module is known in which a capacitor is housed in a case and filled with resin. For such a capacitor module, a structure in which a bus bar penetrates a side wall of the case and is led out to the outside is being considered.

[0003] For example, the cased capacitor described in Patent Document 1 is formed by connecting the capacitor element and electrode plates, inserting the connection terminals of the electrode plates into through holes provided in the side walls of the case, and then filling the case with resin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-111158 A Summary of the Invention [Problem to be solved by the invention]

[0005] The cased capacitor described in Patent Document 1 still has room for improvement in terms of ease of assembly.

[0006] The present invention provides a capacitor module that is easy to assemble. [Means for solving the problem]

[0007] A capacitor module according to one aspect of the present invention comprises: a case having an opening formed at a position facing a bottom surface and a through hole formed on a side surface; A sealing resin filled in the case; one or more capacitors housed in the case; a capacitor connection bus bar connected to an electrode of the capacitor; a terminal bus bar positioned in the through hole, with a first end located inside the case and a second end located outside the case, the first end connected to the capacitor connection bus bar; Equipped with The capacitor connection bus bar has a connection portion that is at least partially inclined from the opening of the case toward the bottom surface and connects to the first end of the terminal bus bar. Effect of the Invention

[0008] According to the present invention, it is possible to provide a capacitor module that can be easily assembled. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a capacitor module according to a first embodiment; [Diagram 2] FIG. 2 is an exploded perspective view of the capacitor module of FIG. 1; [Diagram 3] Case and terminal busbars viewed from the open side of the case [Figure 4] An enlarged view of the area R1 of the capacitor module in Figure 1. [Figure 5A] Cross section of the capacitor module taken along line AA in Figure 1 [Figure 5B] Enlarged view of region R2 in Figure 5A. [Figure 6A] Cross section of the capacitor module shown in Figure 1 [Figure 6B] Enlarged view of region R3 in FIG. 6A [Figure 7A] A diagram showing the internal structure of the capacitor module case in Figure 1. [Figure 7B] An enlarged view of region R4 in FIG. 7A. [Figure 8] A diagram showing a part of the manufacturing process of the capacitor module of FIG. [Figure 9] FIG. 13 is a perspective view showing a capacitor module according to a second embodiment. [Figure 10]FIG. 10 is an exploded perspective view of the capacitor module of FIG. [Figure 11] FIG. 10 is a diagram for explaining the connection between the capacitor connection bus bars and the terminal bus bars of the capacitor module of FIG. [Figure 12] FIG. 10 is a perspective view showing a first capacitor connection bus bar of the capacitor module of FIG. [Figure 13] FIG. 10 is a perspective view showing a second capacitor connection bus bar of the capacitor module of FIG. [Figure 14] CC cross section of the capacitor module in Figure 9 [Figure 15] DD cross section of the capacitor module in Figure 9 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (How the present invention was arrived at) In a capacitor module in which one or more capacitors are housed in a case and filled with resin, there is a demand for arranging connection terminals on the side of the case.In this case, as with the cased capacitor described in Patent Document 1, a method is being considered in which the capacitor element is connected to the electrode plate, and the connection terminal of the electrode plate is passed through a through hole provided in the side wall of the case, thereby exposing the connection terminal from the side wall of the case.

[0011] However, the cased capacitor described in Patent Document 1 has a problem in that resin leaks from the through-holes in the sidewall of the case. In order to suppress the resin leaking from the through-holes in the case, it has been considered to provide the case with a structure to prevent resin leakage, but this makes the case structure complicated, which increases the number of manufacturing steps and increases the manufacturing cost. In addition, the size of the case also increases.

[0012] Therefore, the present inventor(s) investigated a capacitor module that can be easily assembled, and arrived at the following invention.

[0013] A capacitor module according to one aspect of the present disclosure includes: a case having an opening formed at a position facing a bottom surface and a through hole formed on a side surface; A sealing resin filled in the case; one or more capacitors housed in the case; a capacitor connection bus bar connected to an electrode of the capacitor; a terminal bus bar positioned in the through hole, with a first end located inside the case and a second end located outside the case, the first end connected to the capacitor connection bus bar; Equipped with The capacitor connection bus bar has a connection portion that is at least partially inclined from the opening of the case toward the bottom surface and connects to the first end of the terminal bus bar.

[0014] With this configuration, it is possible to provide a capacitor module that can be easily assembled.

[0015] The connection portion may have a contact portion that makes surface contact with the first end portion, and an extension portion that extends in a direction away from the terminal bus bar relative to the contact portion.

[0016] With this configuration, the capacitor connection bus bar and the terminal bus bar can be connected more reliably.

[0017] The extension portion may have a shape such that a distance from the extension portion to a plane along which the plate-shaped contact portion extends increases with increasing distance from the terminal bus bar.

[0018] This configuration makes it easier to bring the contact portion and the terminal bus bar into contact over a wider area.

[0019] The connection portion has a pressing portion and a spring portion, The first end of the terminal bus bar may be sandwiched between the pressing portion and the spring portion.

[0020] With this configuration, the terminal bus bar can be sandwiched between the connection portions, and the capacitor connection bus bar and the terminal bus bar can be connected more reliably.

[0021] The pressing portion may be located on the opening side of the case, and the spring portion may be located on the bottom side of the case.

[0022] With this configuration, the terminal bus bar can be sandwiched between the connection portions, and the capacitor connection bus bar and the terminal bus bar can be connected more reliably.

[0023] The first end of the terminal bus bar may extend at an angle from the bottom surface of the case toward the opening, and the pressing portion may extend at an angle from the opening of the case toward the bottom surface.

[0024] With this configuration, the first end of the terminal bus bar can be easily clamped between the pressing portion and the spring portion, facilitating assembly of the capacitor module.

[0025] The connection portion and the first end of the terminal bus bar may be connected by welding.

[0026] With this configuration, it is possible to join the connection portion and the terminal bus bar over a small area, making it possible to reduce the contact area between them, which contributes to miniaturization of the capacitor module.

[0027] The case may have a base portion on the bottom surface side relative to the through hole, on which the first end of the terminal bus bar is disposed.

[0028] With this configuration, the connection portion and the first end portion can be supported by the base portion, and the capacitor connection bus bar and the terminal bus bar can be connected more reliably.

[0029] The base portion may be disposed on either side of the through hole and may have a slope that inclines toward the through hole.

[0030] With this configuration, the connection portion can be guided toward the through hole.

[0031] The through hole includes a first through hole and a second through hole, the capacitor connection busbars include a first capacitor connection busbar connected to one electrode of the capacitor and a second capacitor connection busbar connected to the other electrode of the capacitor; The terminal bus bars may include a first terminal bus bar positioned in the first through hole and a second terminal bus bar positioned in the second through hole.

[0032] With this configuration, the two terminal bus bars of the capacitor module are exposed to the outside through the side of the case, so they can be exposed to the outside without spanning the opening of the case, which shortens the length of the terminal bus bars and enables the capacitor module to have a low ESL.

[0033] (Embodiment 1) [Overall configuration] Fig. 1 is a perspective view of a capacitor module 100 according to a first embodiment. Fig. 2 is an exploded perspective view of the capacitor module 100 of Fig. 1. The sealing resin 21 is omitted in Fig. 2. Note that the X, Y, and Z directions in the figure indicate the horizontal, height, and vertical directions of the capacitor module 100, respectively.

[0034] 1 and 2, capacitor module 100 includes case 11, sealing resin 21, capacitors 31, 32, capacitor connection bus bars 41, 42, and terminal bus bars 51, 52. In capacitor module 100, capacitors 31, 32, and capacitor connection bus bars 41, 42 are housed in case 11, and sealing resin 21 is filled inside case 11.

[0035] Hereinafter, capacitor connection bus bar 41 will be referred to as first capacitor connection bus bar 41, and capacitor connection bus bar 42 will be referred to as second capacitor connection bus bar 42. Furthermore, terminal bus bar 51 will be referred to as first terminal bus bar 51, and terminal bus bar 52 will be referred to as second terminal bus bar 52.

[0036] Case 11 has a bottom surface 12, and an opening 13 is formed at a position opposite bottom surface 12. Two through holes 14, 15 are formed in a side surface 16 of case 11. A first terminal bus bar 51 is arranged and positioned in first through hole 14, and a second terminal bus bar 52 is arranged and positioned in second through hole 15.

[0037] Sealing resin 21 is filled inside case 11 to seal capacitors 31, 32, capacitor connection bus bars 41, 42, and parts of terminal bus bars 51, 52. Sealing resin 21 is a thermosetting resin, and for example, epoxy resin, urethane resin, or the like can be used.

[0038] Capacitor 31 has a first electrode 31a and a second electrode 31b, and capacitor 32 has a first electrode 32a and a second electrode 32b. Capacitors 31 and 32 are, for example, film capacitors, and are formed by winding a dielectric film having a metal vapor deposition film formed on its surface, and pressing the wound dielectric film into a flat shape.

[0039] The capacitors 31 and 32 are housed in the case 11 with the first electrodes 31a and 32a facing the opening 13 of the case 11 and the second electrodes 31b and 32b facing the bottom surface 12 of the case 11, as shown in FIG.

[0040] The first capacitor connection bus bar 41 electrically connects the first electrodes 31a, 32a of the capacitors 31, 32 to the first terminal bus bar 51. The second capacitor connection bus bar 42 electrically connects the second electrodes 31b, 32b of the capacitors 31, 32 to the second terminal bus bar 52.

[0041] The first capacitor connection busbar 41 includes a main body portion 41a that connects to the first electrodes 31a, 32a of the capacitors 31, 32, and a connection portion 41b that connects to the first terminal busbar 51. Similarly, the second capacitor connection busbar 42 includes a main body portion 42a that connects to the second electrodes 31b, 32b of the capacitors 31, 32, and a connection portion 42b that connects to the second terminal busbar 52.

[0042] The first capacitor connection bus bar 41 and the second capacitor connection bus bar 42 are formed in a plate shape.

[0043] The main body 41a of the first capacitor connection busbar 41 is formed in a plate shape and is connected to the first electrodes 31a, 32a of the capacitors 31, 32. The main body 42a of the second capacitor connection busbar 42 is formed in a plate shape and is connected to the second electrodes 31b, 32b of the capacitors 31, 32.

[0044] Connection portion 41b of first capacitor connection busbar 41 is formed in a plate shape and is electrically connected to first terminal busbar 51 by coming into contact with first terminal busbar 51. Connection portion 42b of second capacitor connection busbar 42 is formed in a plate shape and is electrically connected to second terminal busbar 52 by coming into contact with second terminal busbar 52. Details of connection portions 41b, 42b will be described later. First capacitor connection busbar 41 and second capacitor connection busbar 42 are formed from a plate-shaped conductive member such as a metal plate.

[0045] First terminal bus bar 51 and second terminal bus bar 52 are terminals for electrically connecting capacitor module 100 to an external module or the like. Fig. 3 is a view of case 11 and terminal bus bars 51, 52 as viewed from the opening side of case 11. Components other than case 11 and terminal bus bars 51, 52 are omitted in Fig. 3. Terminal bus bars 51, 52 will be described with reference to Fig. 3.

[0046] First terminal bus bar 51 is positioned in first through hole 14. In other words, first terminal bus bar 51 is inserted into first through hole 14 without any gap. First end 51a of first terminal bus bar 51 is located inside case 11, and second end 51b is located outside case 11. Second terminal bus bar 52 is positioned in second through hole 15. In other words, second terminal bus bar 52 is inserted into second through hole 15 without any gap. First end 52a of second terminal bus bar 52 is located inside case 11, and second end 52b is located outside case 11.

[0047] Case 11 and first and second terminal bus bars 51 and 52 are integrally formed by, for example, insert molding. Therefore, first through hole 14 and second through hole 15 of case 11 are filled with first and second terminal bus bars 51 and 52, respectively, without any gaps. That is, first terminal bus bar 51 is in contact with the entire circumference of the inner edge of case 11 that forms first through hole 14, and second terminal bus bar 52 is in contact with the entire circumference of the inner edge of case 11 that forms second through hole 15. Compared to a case in which case 11 and terminal bus bars 51 and 52 are formed separately and terminal bus bars 51 and 52 are inserted into through holes 14 and 15 later, leakage of sealing resin 21 from first through hole 14 and second through hole 15 can be reduced.

[0048] Next, the connection portions 41b, 42b of the capacitor connection bus bars 41, 42 will be described with reference to Figs. 4 to 6B. Fig. 4 is an enlarged view of a region R1 of the capacitor module 100 of Fig. 1. Fig. 5A is a cross-sectional view of the capacitor module 100 of Fig. 1 taken along line AA, and Fig. 5B is an enlarged view of a region R2 of Fig. 5A. Fig. 6A is a cross-sectional view of the capacitor module 100 of Fig. 1 taken along line BB. Fig. 6B is an enlarged view of a region R3 of Fig. 6A. It should be noted that the case 11 and the sealing resin 21 are omitted in Fig. 4.

[0049] 5A and 5B, at least a portion of connection portion 41b of first capacitor connection busbar 41 is inclined from opening 13 of case 11 toward bottom surface 12, i.e., in the direction of arrow A1 in FIG. 5B, to connect to first end portion 51a of first terminal busbar 51. More specifically, as shown in FIG. 4, connection portion 41b of first capacitor connection busbar 41 has contact portion 43 that comes into surface contact with first end portion 51a of first terminal busbar 51, and extension portion 44 that extends in a direction away from first terminal busbar 51 with respect to contact portion 43. In this embodiment, extension portion 44 is inclined from opening 13 of case 11 toward bottom surface 12.

[0050] As shown in FIG. 5A and FIG. 5B, the contact portion 43 is in surface contact with the first end portion 51a of the first terminal bus bar 51, and the first capacitor connection bus bar 41 and the first terminal bus bar 51 are electrically connected. In this embodiment, the contact portion 43 and the first end portion 51a are welded by a laser to form a weld portion 43a. Therefore, a more reliable electrical connection between the first capacitor connection bus bar 41 and the first terminal bus bar 51 can be realized. The weld portion 43a may be formed in a part of the contact portion 43. By joining the contact portion 43 and the first end portion 51a in this manner, the first capacitor connection bus bar 41 and the first terminal bus bar 51 can be joined by simply bringing the contact portion 43 and the first end portion 51a into contact with each other and irradiating the laser. In addition, in the case of welding by a laser, the space for joining can be reduced, which contributes to the miniaturization of the capacitor module 100.

[0051] Extension portion 44 is formed extending from contact portion 43, and extends in a direction away from first end portion 51a of first terminal bus bar 51. As shown in Fig. 5B, extension portion 44 has a shape in which the distance between extension portion 44 and plane P1 along which contact portion 43 extends increases the further away it is from first terminal bus bar 51. That is, in the portion from the point where extension portion 44 is connected to contact portion 43 to the point closest to opening 13, distance d1 between any portion of extension portion 44 and plane P1 is wider than distance d2 between a portion closer to first terminal bus bar 51 than that and plane P1.

[0052] 6A and 6B, at least a portion of connection portion 42b of second capacitor connection busbar 42 is inclined from opening 13 of case 11 toward bottom surface 12, i.e., inclined in the direction of arrow A2 in FIG. 6B, to connect to first end portion 52a of second terminal busbar 52. More specifically, as shown in FIG. 4, connection portion 42b of second capacitor connection busbar 42 has contact portion 45 in surface contact with first end portion 52a of second terminal busbar 52, and extension portion 46 extending in a direction away from second terminal busbar 52 with respect to contact portion 45. In this embodiment, extension portion 46 is inclined from opening 13 of case 11 toward bottom surface 12.

[0053] As shown in FIG. 6A and FIG. 6B, the contact portion 45 is in surface contact with the first end portion 52a of the second terminal bus bar 52, and the second capacitor connection bus bar 42 and the second terminal bus bar 52 are electrically connected. In this embodiment, the contact portion 45 and the first end portion 52a are welded by a laser to form a weld portion 45a. Therefore, a more reliable electrical connection between the second capacitor connection bus bar 42 and the second terminal bus bar 52 can be realized. The weld portion 45a may be formed in a part of the contact portion 45. By joining the contact portion 45 and the first end portion 52a in this manner, the second capacitor connection bus bar 42 and the second terminal bus bar 52 can be joined by simply bringing the contact portion 45 and the first end portion 52a into contact with each other and irradiating the laser. In addition, in the case of welding by a laser, the space for joining can be reduced, which contributes to the miniaturization of the capacitor module 100.

[0054] Extension portion 46 is formed extending from contact portion 45, and extends in a direction away from first end 52a of second terminal bus bar 52. As shown in Fig. 6B, extension portion 46 has a shape in which the distance between extension portion 46 and plane P2 along which contact portion 45 extends increases the further away it is from second terminal bus bar 52. That is, in the portion from the point where extension portion 46 is connected to contact portion 45 to the point closest to opening 13, distance d3 between any portion of extension portion 46 and plane P2 is wider than distance d4 between a portion closer to second terminal bus bar 52 than that and plane P2.

[0055] In this embodiment, as shown in Fig. 6A, height h1 from bottom surface 12 of case 11 to first terminal bus bar 51 is different from height h2 from bottom surface 12 of case 11 to second terminal bus bar 52. More specifically, height h1 (see Fig. 5A) at which contact portion 43 of first capacitor connection bus bar 41 connects to first end 51a is set higher than height h2 at which contact portion 45 of second capacitor connection bus bar 42 connects to first end 52a. By arranging first terminal bus bar 51 and second terminal bus bar 52 in this manner, when 51 and 52 are provided side by side as shown in Fig. 4, interference between first capacitor connection bus bar 41 connected to 51 and second capacitor connection bus bar 42 connected to 52 can be suppressed.

[0056] 7A is a diagram showing the inner structure of case 11 of capacitor module 100 of FIG. 1. FIG. 7B is an enlarged view of region R4 of FIG. 7A. As shown in FIGS. 7A and 7B, in this embodiment, case 11 has a base portion 61 for arranging and supporting terminal bus bars 51, 52. Base portion 61 is provided in a shape in which inner side surface 16a of case 11 is partially protruded, and is formed on a side closer to bottom surface 12 than first through hole 14 and on a side closer to bottom surface 12 than second through hole 15. First ends 51a, 52a of terminal bus bars 51, 52 are arranged on base portion 61 and supported by base portion 61.

[0057] Slopes 62 and 63 are formed on the base portion 61. The slopes 62 and 63 are inclined surfaces inclined with respect to the Y direction, and are provided in pairs spaced apart in the Z direction. The slopes 62 are disposed so as to sandwich the first through hole 14 in the Z direction, and are inclined toward the through hole 14. The slopes 63 are disposed so as to sandwich the second through hole 15 in the Z direction, and are inclined toward the through hole 15.

[0058] As shown in Fig. 7B, a support portion 64 is provided further inward of the slope 62. The support portion 64 is a portion for supporting the first end portion 51a, and has a pair of side surfaces 64a and a bottom surface 64b extending in the Y direction. Similarly, as shown in Fig. 7B, a support portion 65 is provided further inward of the slope 63. The support portion 65 is a portion for supporting the first end portion 52a, and has a pair of side surfaces 65a and a bottom surface 65b extending in the Y direction.

[0059] Slope 62 has a function of guiding connection portion 41b toward support portion 64 when first capacitor connection bus bar 41 connected to the first electrodes of capacitors 31, 32 is inserted from opening 13 of case 11. Support portion 64 has a function of positioning connection portion 41b guided by slope 62, restricting movement in the Z direction, and positioning connection portion 41b.

[0060] Similarly, slope 63 has a function of guiding connection portion 42b toward support portion 65 when second capacitor connection bus bar 42 connected to the second electrodes of capacitors 31, 32 is inserted from opening 13 of case 11. Support portion 65 has a function of positioning connection portion 42b guided by slope 63 to restrict movement in the Z direction and to position connection portion 42b.

[0061] [Manufacturing method] Fig. 8 is a diagram showing a part of the manufacturing process of the capacitor module 100 of Fig. 1. The manufacturing method of the capacitor module 100 will be described with reference to Fig. 8. Note that, in Fig. 8, the case 11 is shown in a see-through manner for the purpose of explanation. Also, in Fig. 8, the sealing resin 21 is omitted.

[0062] First, an assembly 71 is prepared in which a first capacitor connection bus bar 41 is connected to the first electrodes 31a, 32a of the capacitors 31, 32, and a second capacitor connection bus bar 42 is connected to the second electrodes 31b, 32b of the capacitors 31, 32. The capacitors 31, 32 can be connected to the first capacitor connection bus bar 41 and the second capacitor connection bus bar 42 by, for example, soldering.

[0063] Next, case 11 and terminal bus bars 51, 52 are formed. Case 11 is formed integrally with first terminal bus bar 51 and second terminal bus bar 52 by, for example, insert molding.

[0064] Next, assembly 71 is inserted into case 11. Specifically, assembly 71 is inserted from opening 13 of case 11 toward bottom surface 12 in an insertion direction (the direction of arrow A3 in FIG. 8 ) with second capacitor connection bus bar 42 of assembly 71 facing case 11. When assembly 71 is inserted into case 11, connection portions 41b, 42b come into contact with first ends 51a, 52a of terminal bus bars 51, 52.

[0065] 8, the first ends 51a, 52a of the terminal bus bars 51, 52 are parallel to the XZ plane, whereas the connection portions 41b, 42b of the capacitor connection bus bars 41, 42 are formed to incline toward the bottom surface of the case 11. This allows the contact between the first ends 51a, 52a to start from the tip side of the connection portions 41b, 42b, and the tip side of the connection portions 41b, 42b to be pressed against 51a, 52a to form the contact portions 43, 45 that are in surface contact with 51a, 52a. This allows the connection portions 41b, 42b to be reliably in contact with the first ends 51a, 52a.

[0066] When the assembly 71 is inserted into the case 11, the connection parts 41b, 42b are guided toward the support parts 64, 65 along the slopes 62, 63 of the base part 61 of the case 11. The connection parts 41b, 42b arranged on the support parts 64, 65 come into contact with the first ends 51a, 52a and are positioned in the Z direction. This makes it possible to prevent misalignment when the assembly 71 is inserted into the case 11. In this way, by inserting the connection parts 41b, 42b toward the bottom side, the connection parts 41b, 42b can be brought into contact with the first ends 51a, 52a with high precision, and the assembly 100 can be easily assembled.

[0067] After the assembly 71 is inserted into the case 11, the connection parts 41b, 42b and the first ends 51a, 52a are connected by welding. More specifically, the contact parts 43, 45 in surface contact with the first ends 51a, 52a of the connection parts 41b, 42b are irradiated with a laser, an electron beam, or the like from above (+Y direction). As a result, partial areas of the contact parts 43, 45 are integrally joined with the first ends 51a, 52a located below them to form the welded parts 43a, 45a (see FIG. 4). As a result, the connection between the capacitor connection bus bars 41, 42 and the terminal bus bars 51, 52 can be easily and accurately formed.

[0068] Thereafter, the case 11 is filled with sealing resin 21, and the capacitor module 100 is completed.

[0069] [effect] The capacitor module 100 according to the first embodiment can provide the following advantages.

[0070] The capacitor module 100 includes a case 11, a sealing resin 21, capacitors 31 and 32, capacitor connection bus bars 41 and 42, and terminal bus bars 51 and 52. The case 11 has an opening 13 formed at a position facing the bottom surface 12, and through holes 14 and 15 formed on the side surface. The sealing resin 21 is filled into the case 11. The capacitors 31 and 32 are housed in the case. The capacitor connection bus bars 41 and 42 are connected to the electrodes of the capacitors 31 and 32. The terminal bus bars 51 and 52 are positioned in the through holes 14 and 15, with first ends 51a and 52a located inside the case 11 and second ends 51b and 52b located outside the case 11. The terminal bus bars 51 and 52 connect the first ends 51a and 52a to the capacitor connection bus bars 41 and 42. Capacitor connection bus bar 41 has connection portions that are at least partially inclined from opening 13 of case 11 toward bottom surface 12 and connect to first ends 51a, 52a of terminal bus bars 51, 52.

[0071] Such a configuration makes it possible to provide an easily assembled capacitor module 100. Furthermore, since at least a portion of the connection portions 41b, 42b is inclined from the opening 13 of the case 11 toward the bottom surface 12, the connection portions 41b, 42b and the first ends 51a, 52a can be reliably connected to each other.

[0072] Connection portions 41b, 42b have contact portions 43, 45 in surface contact with first ends 51a, 52a, and extension portions 44, 46 extending in a direction away from terminal bus bars 51, 52 relative to contact portions 43, 45.

[0073] Extension portions 44, 46 are shaped such that the distance between extension portions 44, 46 and planes P1, P2, to which plate-like contact portions 43, 45 extend, increases as the extension portions 44, 46 move away from terminal bus bars 51, 52.

[0074] With this configuration, when assembly 71 in which capacitors 31, 32 and capacitor connection bus bars 41, 42 are connected is inserted into case 11, connection portions 41b, 42b can be pressed against first ends 51a, 52a. This makes it possible to more reliably connect connection portions 41b, 42b to first ends 51a, 52a.

[0075] Connection portions 41b, 42b and first ends 51a, 52a of terminal bus bars 51, 52 are connected by welding.

[0076] With this configuration, the electrical connection between the connection portions 41b, 42b and the first ends 52a, 52a can be more secure.

[0077] Case 11 has a base portion 61 formed on bottom surface 12 side relative to through holes 14, 15, and on which first ends 51a, 52a of terminal bus bars 51, 52 are disposed.

[0078] The base portions 61 are disposed on either side of the through holes 14, 15 and have slopes 62, 63 that incline toward the through holes 14, 15, and the slopes 62, 63 regulate the movement of the connection portions 41b, 42b in a direction along the bottom surface 12.

[0079] With this configuration, the connection portions 41b, 42b can be positioned, thereby preventing the connection portions 41b, 42b from shifting out of position and more reliably connecting the connection portions 41b, 42b to the first ends 51a, 52a.

[0080] In the above embodiment, an example has been described in which capacitor module 100 includes two capacitors 31, 32, but the number of capacitors is not limited to two as long as it is one or more. Furthermore, the arrangement of capacitors 31, 32 inside case 11 is not limited to the above example.

[0081] In the above-described embodiment, an example has been described in which capacitor module 100 includes two capacitor connection bus bars 41, 42 and terminal bus bars 51, 52, but the present invention is not limited to this. For example, a configuration may be adopted in which a bus bar connected to one electrode of the capacitor is a capacitor connection bus bar and is connected to a terminal bus bar, and a bus bar connected to the other electrode is connected to the outside through opening 13 of case 11.

[0082] (Embodiment 2) A capacitor module 200 according to a second embodiment of the present invention will be described.

[0083] In the second embodiment, differences from the first embodiment will be mainly described. In the second embodiment, the same or equivalent configurations as those in the first embodiment will be denoted by the same reference numerals. Also, in the second embodiment, descriptions that overlap with those in the first embodiment will be omitted.

[0084] Fig. 9 is a perspective view showing capacitor module 200 according to embodiment 2. Fig. 10 is an exploded perspective view of capacitor module 200 of Fig. 9. Fig. 11 is a diagram for explaining the connection between capacitor connection bus bars 141, 142 and terminal bus bars 151, 152 of capacitor module 200 of Fig. 9. Sealing resin 21 is omitted in Fig. 10, and sealing resin 21 and case 111 are omitted in Fig. 11.

[0085] In the second embodiment, as shown in FIGS. 9 to 11, the shapes of connection portions 141b, 142b of capacitor connection bus bars 141, 142 and the shapes of first ends 151a, 152a of terminal bus bars 151, 152 differ from those in the first embodiment.

[0086] In the present embodiment, main body portion 141a of first capacitor connection busbar 141 and main body portion 142a of second capacitor connection busbar 142 are arranged to overlap each other. For this reason, insulating paper 172 is arranged between main body portion 141a of first capacitor connection busbar 141 and main body portion 142a of second capacitor connection busbar 142.

[0087] As shown in Figs. 9 to 11, connection portion 141b of first capacitor connection busbar 141 has pressing portion 143 and spring portion 144. As shown in Fig. 11, first end portion 151a of first terminal busbar 151 is sandwiched between pressing portion 143 and spring portion 144, thereby connecting connection portion 141b and first end portion 151a. First terminal busbar 151 is inserted into first through hole 114 of case 111, with first end portion 151a being disposed inside case 111 and second end portion 151b being disposed outside case 111. Pressing portion 143 and first end portion 151a are welded by a laser to form weld portion 143a.

[0088] Similarly, as shown in Figs. 9 to 11, connection portion 142b of second capacitor connection busbar 142 has pressing portion 145 and spring portion 146. As shown in Fig. 11, first end 152a of second terminal busbar 152 is sandwiched between pressing portion 145 and spring portion 146, thereby connecting connection portion 142b and first end 152a. Second terminal busbar 152 is inserted into first through hole 115 of case 111, with first end 152a disposed inside case 111 and second end 152b disposed outside case 111. Pressing portion 145 and first end 152a are welded by a laser to form welded portion 145a.

[0089] Fig. 12 is a perspective view showing first capacitor connection bus bar 141 of capacitor module 200 of Fig. 9. Fig. 13 is a perspective view showing second capacitor connection bus bar 142 of capacitor module 200 of Fig. 9. The first capacitor connection bus bar 141 and the second capacitor connection bus bar 142 of the present embodiment will be described with reference to Figs. 12 and 13.

[0090] As shown in Fig. 12, first capacitor connection bus bar 141 has main body portion 141a and connection portion 141b. In the present embodiment, as shown in Fig. 9 and Fig. 10, capacitor 131 is arranged so that electrodes 131a, 131b face the side surfaces of case 111. Therefore, as shown in Fig. 12, main body portion 141a of first capacitor connection bus bar 141 has plate-shaped portion 147 and bent portion 148 connected to electrode 131a.

[0091] Connection portion 141b of first capacitor connection busbar 141 has pressing portion 143 and spring portion 144. Pressing portion 143 is formed in a plate shape. Spring portion 144 is formed by bending a plate-shaped member to have spring properties. Spring portion 144 is disposed on both sides of pressing portion 143 in the Z direction. Pressing portion 143 and spring portion 144 can sandwich and hold first end portion 151a of first terminal busbar 151.

[0092] As shown in Fig. 13, second capacitor connection bus bar 142 has main body portion 142a and connection portion 142b. In the present embodiment, as shown in Fig. 9 and Fig. 10, capacitor 131 is arranged so that electrodes 131a, 131b face the side surfaces of case 111. Therefore, main body portion 142a of second capacitor connection bus bar 142 has plate-shaped portion 149 and bent portion 150 connected to electrode 31b, as shown in Fig. 13.

[0093] Connection portion 142b of second capacitor connection bus bar 142 has pressing portion 145 and spring portion 146. Pressing portion 145 is formed in a plate shape. Spring portion 146 is formed by bending a plate-shaped member to have spring properties. Spring portion 146 is disposed on both sides of pressing portion 145 in the Z direction. Pressing portion 145 and spring portion 146 can sandwich and hold first end portion 152a of second terminal bus bar 152.

[0094] Fig. 14 is a CC cross-sectional view of the capacitor module 200 of Fig. 9. Fig. 15 is a DD cross-sectional view of the capacitor module 200 of Fig. 9.

[0095] 14, connection portion 141b of first capacitor connection bus bar 141 extends at an incline from opening 113 of case 111 toward bottom surface 112, i.e., at an incline in the direction of arrow A4. First end portion 151a of first terminal bus bar 151 extends at an incline from bottom surface 112 of case 111 toward opening 113.

[0096] 15, connection portion 142b of second capacitor connection bus bar 142 extends at an incline from opening 113 of case 111 toward bottom surface 112, i.e., at an incline in the direction of arrow A5. First end 152a of second terminal bus bar 152 extends at an incline from bottom surface 112 of case 111 toward opening 113.

[0097] With this configuration, when an assembly in which capacitor 31 and capacitor connection bus bars 141, 142 are connected is inserted into case 111 from opening 113, connection portions 141b, 142b and first ends 151a, 152a can be easily positioned. In addition, since first ends 151a, 152a are sandwiched between pressing portions 143, 145 and spring portions 144, 146, the contact area between connection portions 141b, 142b and first ends 151a, 152a can be increased.

[0098] 14, when connection portion 141b and first end portion 151a are connected, pressing portion 143 is located closer to opening 113 of case 111 than first end portion 151a, and spring portion 144 is located closer to bottom surface 112. Connection portion 141b of first capacitor connection bus bar 141 holds first end portion 151a of first terminal bus bar 151 by sandwiching it from the opening 113 side and bottom surface 112 side of case 111.

[0099] 15, when connection portion 142b and first end portion 152a are connected, pressing portion 145 is located closer to opening 113 of case 111 than first end portion 152a, and spring portion 146 is located closer to bottom surface 112. Main body portion 142a of second capacitor connection bus bar 142 holds first end portion 152a of second terminal bus bar 152 by sandwiching it from the opening 113 side and bottom surface 112 side of case 111.

[0100] After the first ends 151a, 152a are sandwiched between the connecting portions 141b, 142b, a laser may be irradiated onto the pressing portions 143, 145 to weld the connecting portions 141b, 142b to the first ends 151a, 152a.

[0101] [effect] The capacitor module 200 according to the second embodiment can provide the following advantages.

[0102] Connection portions 141b, 142b have pressing portions 143, 145 and spring portions 144, 146, and first ends 151a, 152a of terminal bus bars 151, 152 are sandwiched between pressing portions 143, 145 and spring portions 144, 146.

[0103] The pressing portions 143 and 145 are located on the opening 113 side of the case 111 , and the spring portions 144 and 146 are located on the bottom surface 112 side of the case 111 .

[0104] With this configuration, the first ends 151a, 152a are sandwiched between the pressing portions 143, 145 and the spring portions 144, 146, thereby increasing the contact area between the connection portions 141b, 142b and the first ends 151a, 152a, and ensuring a reliable electrical connection.

[0105] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various modifications and alterations will be apparent to those skilled in the art. Such modifications and alterations should be understood to be included within the scope of the present disclosure as defined by the appended claims, unless they deviate from the scope of the present disclosure. In addition, changes in the combination and order of elements in each embodiment may be made without departing from the scope and spirit of the present disclosure.

[0106] Incidentally, by appropriately combining any of the various modified examples of the above embodiment, it is possible to obtain the effects of each of the modified examples. [Industrial Applicability]

[0107] The present invention is useful for capacitors used in various electronic devices, electric devices, industrial devices, vehicle devices, etc. [Explanation of symbols]

[0108] 11, 111 cases 12, 112 Bottom 13, 113 aperture 14 Through hole (first through hole) 15 Through hole (second through hole) 20 Sealing resin 31, 32, 131 Capacitor 41, 141 Capacitor connection bus bar (first capacitor connection bus bar) 41a, 141a Main body 41b, 141b connection 43 Contact part 44 Extension 143 Clamp 144 Spring part 42, 142 Capacitor connection busbar (second capacitor connection busbar) 42a, 142a Main body 42b, 142b connection 45 Contact part 46 Extension 145 Clamp 146 Spring section 51, 151 Terminal busbar (1st terminal busbar) 51a, 151a 1st end 51b Second end 52, 152 Terminal busbar (2nd terminal busbar) 52a, 152a 1st end 52b 2nd end 61 Base 62, 63 Slope 100, 200 Capacitor Module

Claims

1. a case having an opening formed at a position facing a bottom surface and a through hole formed on a side surface; A sealing resin filled in the case; one or more capacitors housed in the case; a capacitor connection bus bar connected to an electrode of the capacitor; a terminal bus bar positioned in the through hole, the first end being located inside the case and the second end being located outside the case, the first end being connected to the capacitor connection bus bar; Equipped with the capacitor connection bus bar has a connection portion at least a portion of which is inclined from the opening of the case toward the bottom surface and connected to the first end of the terminal bus bar. Capacitor module.

2. The connection portion has a contact portion that is in surface contact with the first end portion, and an extension portion that extends in a direction away from the terminal bus bar relative to the contact portion. The capacitor module according to claim 1 .

3. the extension portion has a shape in which a distance between the extension portion and a plane along which the plate-shaped contact portion extends becomes wider as the extension portion becomes more distant from the terminal bus bar; The capacitor module according to claim 2 .

4. The connection portion has a pressing portion and a spring portion, The first end of the terminal bus bar is sandwiched between the pressing portion and the spring portion. The capacitor module according to claim 1 .

5. The pressing portion is located on the opening side of the case, and the spring portion is located on the bottom side of the case. The capacitor module according to claim 4 .

6. The first end of the terminal bus bar extends obliquely from the bottom surface of the case toward the opening, and the pressing portion extends obliquely from the opening of the case toward the bottom surface. The capacitor module according to claim 4 or 5.

7. The connection portion and the first end of the terminal bus bar are connected by welding. The capacitor module according to claim 1 .

8. the case has a base portion on the bottom surface side of the through hole, on which the first end of the terminal bus bar is disposed, The capacitor module according to claim 1 .

9. The base portion is disposed on either side of the through hole and has a slope inclined toward the through hole. The capacitor module according to claim 8 .

10. The through hole includes a first through hole and a second through hole, the capacitor connection bus bar includes a first capacitor connection bus bar connected to one electrode of the capacitor and a second capacitor connection bus bar connected to the other electrode of the capacitor; the terminal bus bars include a first terminal bus bar positioned in the first through hole and a second terminal bus bar positioned in the second through hole; The capacitor module according to claim 1 .

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