Capacitor module

Abstract

This capacitor module comprises: capacitor elements that each have a first end-face electrode, a second end-face electrode, and a side surface connecting the first end-face electrode and the second end-face electrode; a case containing the capacitor elements; a planar first bus bar which includes a first electrode contact portion connected to the first end-face electrodes of the capacitor elements and disposed along the first end-face electrodes in the case, and a first terminal portion extending from a terminal exposed surface of the case to the outside of the case; a planar second bus bar which includes a second electrode contact portion connected to the second end-face electrodes of the capacitor elements and disposed along the second end-face electrodes in the case, and a second terminal portion extending from the terminal exposed surface of the case to the outside of the case, the second terminal portion overlapping the first terminal portion in plan view; an insulator which is disposed between the first terminal portion and the second terminal portion to insulate the first terminal portion and the second terminal portion from each other, and which includes a first surface that contacts one main surface of the first terminal portion and a second surface that contacts one main surface of the second terminal portion; and a sealing resin with which the case is filled.

Description

Capacitor Module

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

[0002] A capacitor module is known in which a first bus bar is connected to a first electrode of a capacitor element and a second bus bar is connected to a second electrode of the capacitor element.

[0003] For example, Patent Document 1 describes a capacitor module including a first bus bar electrically connected to one of a pair of electrodes of a capacitor element having a pair of electrodes, and a second bus bar electrically connected to the other of the pair of electrodes.

[0004] International Publication No. 2015 / 133218

[0005] The capacitor module described in Patent Document 1 still has room for improvement in terms of reducing ESL.

[0006] The present invention provides a capacitor module capable of reducing ESL.

[0007] a case that accommodates the capacitor element; a plate-like first bus bar that has a first electrode contact portion connected to the first end surface electrode of the capacitor element and arranged along the first end surface electrode within the case, and a first terminal portion extending from a terminal exposed surface of the case toward the outside of the case; a plate-like second bus bar that has a second electrode contact portion connected to the second end surface electrode of the capacitor element and arranged along the second end surface electrode within the case, and a second terminal portion that extends from the terminal exposed surface of the case toward the outside of the case and overlaps with the first terminal portion in a plan view; and an insulator that is arranged between the first terminal portion and the second terminal portion, insulating the first terminal portion from the second terminal portion, and has a first surface that contacts one main surface of the first terminal portion and a second surface that contacts one main surface of the second terminal portion. and a sealing resin filled in the case.

[0008] According to the present invention, it is possible to provide a capacitor module capable of reducing ESL.

[0009] 1A is a perspective view of the capacitor module according to the first embodiment; FIG. 1B is a perspective view of the capacitor module of FIG. 1A from another direction; FIG. 1C is a plan view of the capacitor module of FIG. 1; FIG. 1D is a perspective view of the capacitor module of FIG. 1A, omitting the case and sealing resin;

[0010] (Background to the Invention) Capacitor modules are sometimes used in inverter circuits for vehicles, such as hybrid vehicles. When a capacitor module is used in an inverter circuit, the drive frequency of the inverter circuit corresponds to a high frequency, and therefore, if the capacitor module has a high ESL (equivalent series inductance), a surge voltage generated in the inverter circuit becomes large. Therefore, reducing the ESL of the capacitor module is an issue.

[0011] However, it is difficult to sufficiently reduce the ESL with the capacitor module described in Patent Document 1. Therefore, the present inventors have studied capacitor modules that can further reduce the ESL, and have arrived at the following invention.

[0012] a first end surface electrode of the capacitor element and a second end surface electrode of the capacitor element; a case that accommodates the capacitor element; a first plate-like bus bar that has a first electrode contact portion connected to the first end surface electrode of the capacitor element and arranged along the first end surface electrode within the case, and a first terminal portion extending from a terminal exposed surface of the case toward the outside of the case; a second plate-like bus bar that has a second electrode contact portion connected to the second end surface electrode of the capacitor element and arranged along the second end surface electrode within the case, and a second terminal portion that extends from the terminal exposed surface of the case toward the outside of the case and overlaps with the first terminal portion in a plan view; and an insulator that is arranged between the first terminal portion and the second terminal portion, insulating the first terminal portion from the second terminal portion, and has a first surface that contacts one main surface of the first terminal portion and a second surface that contacts one main surface of the second terminal portion. and a sealing resin filled in the case.

[0013] With this configuration, it is possible to provide a capacitor module that can reduce ESL.

[0014] In the capacitor module according to the second aspect of the present invention, the capacitor element may be formed of a laminate of dielectric films, and the glass transition point of the dielectric films may be 120° C. or higher.

[0015] This configuration improves the heat resistance of the capacitor module, making it possible to provide a capacitor module that can withstand the temperature rise caused by overlapping the first terminal portion and the second terminal portion.

[0016] In the capacitor module according to the third aspect of the present invention, the side surface of the capacitor element may have a pair of flat portions and a pair of curved portions connecting the pair of flat portions, and the first bus bar may have a first extension portion connecting the first electrode contact portion and the first terminal portion and arranged along the flat portions.

[0017] With this configuration, the side surface of the capacitor element and the first bus bar can be brought closer together, thereby further reducing the ESL.

[0018] In the capacitor module according to the fourth aspect of the present invention, the second bus bar may have a second extension portion that connects the second electrode contact portion and the second terminal portion and is disposed along the flat portion.

[0019] With this configuration, the side surface of the capacitor element and the first bus bar can be brought closer together, thereby further reducing the ESL.

[0020] In a capacitor module according to a fifth aspect of the present invention, the first bus bar has a third terminal portion extending from the first electrode contact portion and exposed from a surface of the case different from the terminal exposed surface, and the second bus bar has a fourth terminal portion extending from the second electrode contact portion and exposed from a surface of the case different from the terminal exposed surface, and the first terminal portion and the second terminal portion may function as output terminals, and the third terminal portion and the fourth terminal portion may function as input terminals.

[0021] With this configuration, the capacitor module can be provided with a charging terminal.

[0022] In the capacitor module according to the sixth aspect of the present invention, the first terminal portion and the second terminal portion may be AC ​​terminals, and the third terminal portion and the fourth terminal portion may be DC terminals.

[0023] With this configuration, the capacitor module can be provided with a charging terminal.

[0024] In the capacitor module according to the seventh aspect of the present invention, the third terminal portion and the fourth terminal portion may not overlap each other in a plan view.

[0025] Such a configuration can improve the degree of freedom in designing the capacitor module.

[0026] In a capacitor module according to an eighth aspect of the present invention, the first electrode contact portion may have a first through hole formed therethrough in the thickness direction, the outer shape of the first through hole constituting a first mounting portion having a shape in which a portion of the first electrode contact portion protrudes toward the inside of the first through hole, and the first mounting portion has an end portion that is closer to the terminal exposed surface connected to the first electrode contact portion; and the second electrode contact portion may have a second through hole formed therethrough in the thickness direction, the outer shape of the second through hole constituting a second mounting portion having a shape in which a portion of the second electrode contact portion protrudes toward the inside of the second through hole, and the second mounting portion has an end portion that is closer to the terminal exposed surface connected to the second electrode contact portion.

[0027] With this configuration, the distance over which current flows between the end surface electrode of the capacitor element and the first terminal portion or the second terminal portion of the bus bar can be shortened, thereby further reducing the ESL.

[0028] In the capacitor module according to the ninth aspect of the present invention, a first stud for electrically connecting the capacitor element to an external device is arranged on the first terminal portion, and a second stud for electrically connecting the capacitor element to an external device is arranged on the second terminal portion, and the first stud and the second stud may protrude in opposite directions.

[0029] With this configuration, the capacitor module can be easily connected to an external device.

[0030] A first embodiment of the present invention will be described below with reference to the accompanying drawings. In each drawing, each element is shown schematically for ease of explanation.

[0031] (Embodiment 1) [Overall Configuration] Fig. 1A is a perspective view showing a capacitor module according to embodiment 1. Fig. 1B is a view of the capacitor module of Fig. 1A viewed from another direction. Fig. 2 is a plan view of the capacitor module of Fig. 1A. Fig. 3 is a perspective view of the capacitor module of Fig. 1A with the case and sealing resin omitted. Fig. 4 is an exploded perspective view of the capacitor module of Fig. 3. Note that the X, Y, and Z directions in the figures indicate the horizontal, vertical, and height directions of the capacitor module 100, respectively.

[0032] 1A to 4, capacitor module 100 includes capacitor element 10, case 20, first bus bar 30, second bus bar 40, insulator 50, and sealing resin 60. In this embodiment, capacitor element 10, a portion of first bus bar 30, and a portion of second bus bar 40 are housed in case 20 and sealed with sealing resin 60.

[0033] Each component of the capacitor module 100 will now be described.

[0034] <Capacitor Element> Fig. 5A is a perspective view showing a capacitor element of the capacitor module of Fig. 3. Fig. 5B is a plan view of the capacitor element of Fig. 5A. Capacitor element 10 will be described with reference to Figs. 5A and 5B.

[0035] Capacitor element 10 has a first end surface electrode 11, a second end surface electrode 12, and a side surface 13 connecting first end surface electrode 11 and second end surface electrode 12. In the present embodiment, side surface 13 of capacitor element 10 has a pair of opposing flat portions 13 a and a pair of curved portions 13 b connecting the pair of flat portions 13 a.

[0036] Capacitor element 10 is a film capacitor composed of a laminate of dielectric films. More specifically, capacitor element 10 is formed by stacking dielectric films each having a metal vapor deposition film formed on its surface, and then rolling the stack. In this embodiment, the rolled dielectric film is pressed into a flat shape, thereby forming capacitor element 10 into a columnar shape with an oval cross section.

[0037] The dielectric film may be formed, for example, from a mixed resin solution containing phenoxy resin and MDI (diphenylmethane diisocyanate). Alternatively, a dielectric film may be formed from a mixed resin solution containing polyvinyl acetoacetal (PVAA) and ethyl acetate. Forming the dielectric film from such a mixed resin solution can increase the glass transition temperature of the dielectric film to 120°C or higher, thereby improving the heat resistance of the capacitor module. Metal vapor deposition films formed on the surface of the dielectric film may include metals such as Al and Zn.

[0038] A first end surface electrode 11 is formed at one end of the wound dielectric film, and a second end surface electrode 12 is formed at the other end. The first end surface electrode 11 and the second end surface electrode 12 can be formed by, for example, spraying Zn or the like.

[0039] <Case> Case 20 is a case for housing capacitor elements 10. In the present embodiment, as shown in Figures 1 and 2, case 20 has a rectangular parallelepiped shape and has openings that expose portions of first bus bar 30 and second bus bar 40. Six capacitor elements 10 shown in Figures 3 and 4 are housed in case 20. Portions of first bus bar 30 and second bus bar 40 are also housed in case 20.

[0040] 2, the case 20 has a first terminal exposed surface 20a and a second terminal exposed surface 20b that is different from the first terminal exposed surface 20a. The first terminal exposed surface 20a exposes a first terminal portion 32 of the first bus bar 30 and a second terminal portion 42 of the second bus bar 40 (see FIGS. 7 and 8), which will be described later. In other words, the first terminal portion 32 and the second terminal portion 42 are exposed from the first terminal exposed surface 20a of the case 20, and the third terminal portion 34 and the fourth terminal portion 44, which will be described later, are exposed from the second terminal exposed surface 20b.

[0041] The case 20 is made of synthetic resin such as polyphenylene sulfide (PPS resin) or polybutylene terephthalate (PBT resin).

[0042] <First Bus Bar> The first bus bar 30 is a terminal for electrically connecting the first end surface electrode 11 of the capacitor element 10 to a terminal of an external device (not shown).

[0043] The first bus bar 30 is formed of a conductive material such as a plate-shaped metal. As shown in FIGS. 3 and 4 , the first bus bar 30 has a first electrode contact portion 31 and a first terminal portion 32. The first electrode contact portion 31 is connected to the first end surface electrode 11 of the capacitor element 10 and is arranged along the first end surface electrode 11 inside the case 20. The first electrode contact portion 31 is arranged to extend in the XY plane so as to contact the first end surface electrodes 11 of all capacitor elements 10 in the capacitor module 100. The first terminal portion 32 extends from the first terminal exposed surface 20a of the case 20 toward the outside of the case 20. In this embodiment, the first bus bar 30 also has a first extension portion 33 connecting the first electrode contact portion 31 and the first terminal portion 32. In this embodiment, the first bus bar 30 further has a third terminal portion 34 extending from the first electrode contact portion 31 and exposed from the second terminal exposed surface 20b of the case 20. In this embodiment, the third terminal portion 34 is provided on the opposite side of the first electrode contact portion 31 to the first terminal portion 32 .

[0044] Fig. 6 is a cross-sectional view taken along line A-A of the capacitor module of Fig. 3. As shown in Figs. 3 and 6, the first electrode contact portion 31 is disposed so as to contact the first end surface electrode 11 of each capacitor element 10. A first extension portion 33 extends from one end of the first electrode contact portion 31 along the flat portion 13a of the capacitor element 10, and a first terminal portion 32 extends from the end of the first extension portion 33. A third terminal portion 34 extends from the other end of the first electrode contact portion 31. The first terminal portion 32 and the third terminal portion 34 of the first bus bar 30 are disposed so as to be exposed from the case 20.

[0045] By arranging the first extending portion 33 along and in close proximity to the flat portion 13a of the capacitor element 10, the ESL of the capacitor module 100 can be reduced.

[0046] The first terminal 32 functions as an output terminal of the capacitor module 100, and an alternating current flows through the first terminal 32. On the other hand, the third terminal 34 functions as an input terminal of the capacitor module 100, and a direct current flows through the third terminal 34. The third terminal 34 can be used as a terminal for charging the capacitor module 100.

[0047] 3 , a first through hole 35 is formed in the first electrode contact portion 31, penetrating the first bus bar 30 in the thickness direction. The outer shape of the first through hole 35 defines a first mounting portion 36 in which a portion of the first electrode contact portion 31 protrudes toward the inside of the first through hole 35, and the first mounting portion 36 is formed integrally with the first electrode contact portion 31. The first mounting portion 36 and the first end surface electrode 11 of the capacitor element 10 are electrically connected to each other by connecting the first mounting portion 36 and the first end surface electrode 11 of the capacitor element 10 with solder.

[0048] In this embodiment, twelve first through holes 35 and first mounting portions 36 are formed in the first electrode contact portion 31, and two first mounting portions 36 are arranged for the first end surface electrode 11 of one capacitor element 10 in plan view. That is, each capacitor element 10 is connected by solder using two first mounting portions 36. The number of first through holes 35 and first mounting portions 36 is not limited to twelve, and may be any number that allows each capacitor element 10 and the first bus bar 30 to be electrically connected.

[0049] <Second bus bar> Fig. 7 is a perspective view of the capacitor module of Fig. 3 as viewed from a different angle. Fig. 8 is a cross-sectional view of the capacitor module of Fig. 7 taken along the line BB.

[0050] The second bus bar 40 is a terminal for electrically connecting the second end surface electrode 12 of the capacitor element 10 to a terminal of an external device (not shown). Note that the basic configuration of the second bus bar 40 is the same as that of the first bus bar 30, and therefore a description thereof will be omitted where appropriate.

[0051] As shown in FIGS. 4 and 7 , the second bus bar 40 has a second electrode contact portion 41 and a second terminal portion 42. The second electrode contact portion 41 is connected to the second end surface electrode 12 of the capacitor element 10 and is disposed along the second end surface electrode 12 inside the case 20. The second terminal portion 42 extends toward the first terminal exposed surface 20a of the case 20. In the present embodiment, the second bus bar 40 also has a second extension portion 43 connecting the second electrode contact portion 41 and the second terminal portion 42. In the present embodiment, the second bus bar 40 further has a fourth terminal portion 44 extending from the second electrode contact portion 41 and exposed from the second terminal exposed surface 20b of the case 20. In the present embodiment, the fourth terminal portion 44 is provided on the opposite side of the second electrode contact portion 41 to the second terminal portion 42.

[0052] As shown in Fig. 8, the second electrode contact portion 41 is arranged so as to contact the second end surface electrode 12 of each capacitor element 10. A second extension portion 43 extends from one end of the second electrode contact portion 41 along the flat portion 13a of the capacitor element 10, and a second terminal portion 42 extends from the end of the second extension portion 43. The second extension portion 43 is arranged alongside the first extension portion 33 of the first bus bar 30 and along the flat portion 13a of the capacitor element 10. A fourth terminal portion 44 extends from the other end of the second electrode contact portion 41. The second terminal portion 2 and the fourth terminal portion 44 of the second bus bar 40 are arranged so as to be exposed from the case 20.

[0053] By arranging the second extending portion 43 along the flat portion 13a of the capacitor element 10, the ESL of the capacitor module 100 can be reduced.

[0054] The second terminal 42 functions as an output terminal of the capacitor module 100, and an alternating current flows through the second terminal 42. On the other hand, the fourth terminal 44 functions as an input terminal of the capacitor module 100, and a direct current flows through the fourth terminal 44. The fourth terminal 44 can be used as a terminal for charging the capacitor module 100.

[0055] 7 , a second through-hole 45 is formed in the second electrode contact portion 41, penetrating the second bus bar 40 in the thickness direction. The outer shape of the second through-hole 45 defines a second mounting portion 46 in which a portion of the second electrode contact portion 41 protrudes toward the inside of the second through-hole 45, and the second mounting portion 46 is formed integrally with the second electrode contact portion 41. The second mounting portion 46 and the second end surface electrode 12 of the capacitor element 10 are electrically connected to each other by connecting the second mounting portion 46 and the second end surface electrode 12 of the capacitor element 10 with solder.

[0056] In the present embodiment, twelve second through holes 45 and second mounting portions 46 are formed in the second electrode contact portion 41, and two second mounting portions 46 are arranged for the second end surface electrode 12 of one capacitor element 10 in plan view. That is, each capacitor element 10 is connected by solder using two second mounting portions 46. The number of second through holes 45 and second mounting portions 46 is not limited to twelve, and may be any number that allows each capacitor element 10 and the second bus bar 40 to be electrically connected.

[0057] 3 and 6 to 8, the first terminal portion 32 of the first bus bar 30 and the second terminal portion 42 of the second bus bar 40 are arranged to overlap in the Z direction in a plan view. An insulator 50 is arranged between the first terminal portion 32 and the second terminal portion 42, so that the first terminal portion 32 and the second terminal portion 42 are electrically insulated from each other.

[0058] 2, in a plan view, the third terminal portion 34 and the fourth terminal portion 44 do not overlap each other. In other words, the third terminal portion 34 and the fourth terminal portion 44 are disposed at positions offset from each other in the X and Y directions.

[0059] <Insulator> The insulator 50 is a sheet-like member disposed between the first terminal 32 and the second terminal 42 to insulate the first terminal 32 from the second terminal 42. Disposing the insulator 50 between the first terminal 32 and the second terminal 42 can prevent short-circuiting between the terminals. The insulator 50 is formed, for example, from insulating paper or insulating resin. As shown in FIGS. 6 and 8 , the insulator 50 has a first surface 50a and a second surface 50b. The first surface 50a of the insulator 50 contacts one main surface of the first terminal 32, and the second surface 50b of the insulator 50 contacts one main surface of the second terminal 42. To reduce the distance between the first terminal 32 and the second terminal 42, it is preferable that the thickness of the insulator 50 be as thin as possible while still providing sufficient insulation between the first terminal 32 and the second terminal 42.

[0060] 1 , sealing resin 60 is filled into case 20 to seal six capacitor elements 10 housed in case 20 and parts of first bus bar 30 and second bus bar 40. Sealing resin 60 is made of a thermosetting resin such as epoxy resin or urethane resin. It is preferable to use a material with high fluidity and adhesiveness as the material for sealing resin 60.

[0061] <Studs> In this embodiment, a first stud 70 for connecting the first end surface electrode 11 of the capacitor element 10 to an external device is arranged on the first terminal portion 32 of the first bus bar 30. Furthermore, a second stud 80 for connecting the second end surface electrode 12 of the capacitor element 10 to an external device is arranged on the second terminal portion 42 of the second bus bar 40. Furthermore, the first stud 70 and the second stud 80 protrude in opposite directions in the Z direction. By arranging the first stud 70 and the second stud 80 in this manner, even when the first terminal portion 32 and the second terminal portion 42 overlap, it is possible to easily connect the external device to the first terminal portion 32 or the second terminal portion 42.

[0062] The first stud 70 and the second stud 80 may be formed, for example, by a self-clinching stud that is press-fit into the terminal portion. By forming the first stud 70 and the second stud 80 from a self-clinching stud, the first terminal portion 32 and the second terminal portion 42 can be arranged in parallel and stacked, further reducing the ESL of the capacitor module 100. Alternatively, the first stud 70 and the second stud 80 may be formed by a screw or the like.

[0063] As shown in FIG. 4, in this embodiment, six first studs 70 and six second studs 80 are arranged, but the number of studs is not limited to this, and it is sufficient that an appropriate number of studs are arranged for connecting an external device.

[0064] [Operation] The operation when a current is passed through the capacitor module 100 will be described.

[0065] In the capacitor module 100, by arranging the first terminal 32 and the second terminal 42 so that they overlap in the Z direction, when voltages of opposite polarities are applied to the first bus bar 30 and the second bus bar 40, currents flow in opposite directions through the first terminal 32 and the second terminal 42. In this case, the magnetic fields caused by the current flowing through the first terminal 32 and the magnetic fields caused by the current flowing through the second terminal 42 cancel each other out, thereby reducing the ESL of the capacitor module 100. In particular, current concentrates at the first terminal 32 and the second terminal 42 because they are the inlets and outlets of current. For this reason, overlapping the first terminal 32 and the second terminal 42 has a significant effect on reducing ESL.

[0066] When the first terminal 32 and the second terminal 42 are stacked close to each other, the heat transferability of the capacitor module 100 increases, and the first terminal 32 and the second terminal 42 are more likely to generate heat when a current flows. Furthermore, because both the first extension 33 and the second extension 43 are arranged along the side surfaces of the capacitor element 10, the central temperature of the capacitor element 10 is more likely to rise. In this embodiment, a film with a glass transition point of 120°C or higher is used as the dielectric film constituting the capacitor element 10, thereby achieving higher heat resistance than conventional capacitor elements. Therefore, the capacitor module 100 has heat resistance against an increase in the central temperature of the capacitor element 10.

[0067] 6 and 8 , in this embodiment, the first extension portion 33 and the second extension portion 43 have different lengths in the Z direction. Specifically, the first extension portion 33 is formed longer than the second extension portion 43. The lengths of the first extension portion 33 and the second extension portion 43 are unlikely to affect the ESL reduction of the capacitor module 100, so, for example, the second extension portion 43 may be longer than the first extension portion 33, or the first extension portion 33 and the second extension portion 43 may be the same length. Alternatively, an extension portion may be formed on only one of the first bus bar 30 and the second bus bar 40.

[0068] In the capacitor module 100, the end of the first mounting portion 36 that approaches the first terminal exposed surface 20a of the case 20 is connected to the first electrode contact portion 31. Since the first mounting portion 36 is connected to the first electrode contact portion 31 in the direction that approaches the first terminal exposed surface 20a, the distance over which current flows between the capacitor element 10 and the first terminal portion 32 can be shortened, which contributes to reducing the ESL of the capacitor module 100.

[0069] Similarly, the end of the second mounting portion 46 that faces the first terminal exposed surface 20a of the case 20 is connected to the second electrode contact portion 41. Since the second mounting portion 46 is connected to the second electrode contact portion 41 in the direction that faces the first terminal exposed surface 20a, the distance over which current flows between the capacitor element 10 and the second terminal portion 42 can be shortened, which contributes to reducing the ESL of the capacitor module 100.

[0070] Furthermore, in this embodiment, the third terminal 34 and the fourth terminal 44 are arranged so as not to overlap. The third terminal 34 and the fourth terminal 44 are terminals used for charging the capacitor module 100, and direct current flows through them. Therefore, even if the third terminal 34 and the fourth terminal 44 do not overlap, this has little effect on reducing the ESL of the capacitor module 100.

[0071] [Effects] According to the above-described embodiment, the following effects can be achieved.

[0072] The capacitor module 100 includes a capacitor element 10, a case 20, a first bus bar 30, a second bus bar 40, an insulator 50, and a sealing resin 60. The capacitor element 10 has a first end surface electrode 11, a second end surface electrode 12, and a side surface 13 connecting the first end surface electrode 11 and the second end surface electrode 12. The case 20 accommodates the capacitor element 10. The first bus bar 30 is connected to the first end surface electrode 11 of the capacitor element 10 and has a first electrode contact portion 31 arranged along the first end surface electrode 11 within the case 20, and a first terminal portion 32 extending toward a first terminal exposed surface 20a of the case 20. The second bus bar 40 has a second electrode contact portion 41 connected to the second end surface electrode 12 of the capacitor element 10 and arranged along the second end surface electrode 12 inside the case 20, and a second terminal portion 42 extending toward the first terminal exposed surface 20a of the case 20 and overlapping with the first terminal portion 32 in a plan view. The insulator 50 is arranged between the first terminal portion 32 and the second terminal portion 42 to insulate the first terminal portion 32 from the second terminal portion 42, and has a first surface 50a in contact with one main surface of the first terminal portion 32 and a second surface 50b in contact with one main surface of the second terminal portion 42. The sealing resin 60 is filled into the case 20.

[0073] With this configuration, the ESL of the capacitor module 100 can be reduced.

[0074] The capacitor element 10 is composed of a laminate of dielectric films, and the glass transition point of the dielectric films is 120° C. or higher.

[0075] This configuration makes it possible to provide a capacitor module with high heat resistance. Stacking the first terminal portion 32 and the second terminal portion 42 improves heat transfer, facilitating heat transfer between the terminals, leading to a rise in the temperature of the capacitor module 100. By using a capacitor element 10 made of a laminate of highly heat-resistant dielectric films with a glass transition point of 120°C or higher, it is possible to provide a capacitor module with improved heat resistance while reducing ESL.

[0076] The side surface 13 of the capacitor element 10 has a pair of flat portions 13 a and a pair of curved portions 13 b connecting the pair of flat portions 13 a. The first bus bar 30 connects the first electrode contact portion 31 and the first terminal portion 32 and has a first extension portion 33 disposed along the flat portions 13 a.

[0077] With this configuration, the side surface 13 of the capacitor element 10 and the first bus bar 30 can be brought closer together, so that the ESL of the capacitor module 100 can be further reduced.

[0078] The second bus bar 40 connects the second electrode contact portion 41 and the second terminal portion 42 and has a second extension portion 43 disposed along the flat portion 13a.

[0079] With this configuration, the side surface 13 of the capacitor element 10 and the first bus bar 30 can be brought closer together, so that the ESL of the capacitor module 100 can be further reduced.

[0080] The first bus bar 30 has a third terminal portion 34 extending from the first electrode contact portion 31 and exposed from a surface of the case 20 different from the first terminal exposed surface 20a. The second bus bar 40 has a fourth terminal portion 44 extending from the second electrode contact portion 41 and exposed from a surface of the case 20 different from the first terminal exposed surface 20a. The first terminal portion 32 and the second terminal portion 42 function as output terminals, and the third terminal portion 34 and the fourth terminal portion 44 function as input terminals.

[0081] With this configuration, the capacitor module 100 can be provided with a charging terminal.

[0082] The first terminal 32 and the second terminal 42 are AC terminals, and the third terminal 34 and the fourth terminal 44 are DC terminals.

[0083] With this configuration, the capacitor module 100 can be provided with a charging terminal.

[0084] The third terminal portion 34 and the fourth terminal portion 44 do not overlap in a plan view.

[0085] Such a configuration allows for greater freedom in designing the capacitor module 100.

[0086] The first electrode contact portion 31 has a first through hole 35 formed therethrough in the thickness direction, and the outer shape of the first through hole 35 forms a first mounting portion 36 in which a portion of the first electrode contact portion 31 protrudes toward the inside of the first through hole 35. The end of the first mounting portion 36 that faces the first terminal exposed surface 20 a is connected to the first electrode contact portion 31. The second electrode contact portion 41 has a second through hole 45 formed therethrough in the thickness direction, and the outer shape of the second through hole 45 forms a second mounting portion 46 in which a portion of the second electrode contact portion 41 protrudes toward the inside of the second through hole 45. The end of the second mounting portion 46 that faces the first terminal exposed surface 20 a is connected to the second electrode contact portion 41.

[0087] This configuration shortens the distance over which current flows from the first end surface electrode 11 to the first terminal 32 and from the second end surface electrode 12 to the second terminal 42. This further reduces the ESL of the capacitor module 100.

[0088] A first stud 70 is arranged on the first terminal portion 32 for electrically connecting the capacitor element 10 to an external device, and a second stud 80 is arranged on the second terminal portion 42 for electrically connecting the capacitor element 10 to an external device.

[0089] With this configuration, the capacitor module 100 can be easily connected to an external device.

[0090] In the above-described embodiment, an example has been described in which the first bus bar 30 has the first extension portion 33 and the third terminal portion 34, and the second bus bar 40 has the second extension portion 43 and the fourth terminal portion 44. However, the first bus bar 30 and the second bus bar 40 do not necessarily have extension portions. Similarly, the first bus bar 30 and the second bus bar 40 do not necessarily have the third terminal portion 34 and the fourth terminal portion 44.

[0091] In the above-described embodiment, the capacitor element 10 is formed in a columnar shape having an oval cross section, but is not limited to this. The capacitor element 10 may be formed in a cylindrical shape or a polygonal columnar shape such as a square column.

[0092] In the above-described embodiment, an example in which the insulator 50 is disposed between the first terminal 32 and the second terminal 42 has been described, but the present invention is not limited to this. Instead of the insulator 50, an insulating coating may be applied to at least one of the main surfaces of the first terminal 32 and the second terminal 42.

[0093] (Outline of the embodiment) (1) A capacitor module of the present invention includes: a capacitor element having a first end surface electrode, a second end surface electrode, and a side surface connecting the first end surface electrode and the second end surface electrode; a case that accommodates the capacitor element; a plate-shaped first bus bar that has a first electrode contact portion connected to the first end surface electrode of the capacitor element and arranged along the first end surface electrode within the case, and a first terminal portion extending from a terminal exposed surface of the case toward an exterior of the case; a plate-shaped second bus bar that has a second electrode contact portion connected to a second end surface electrode of the capacitor element and arranged along the second end surface electrode within the case, and a second terminal portion extending from the terminal exposed surface of the case toward an exterior of the case and overlapping with the first terminal portion in a plan view; an insulator that is arranged between the first terminal portion and the second terminal portion to insulate the first terminal portion from the second terminal portion, and that has a first surface in contact with one main surface of the first terminal portion and a second surface in contact with one main surface of the second terminal portion; and a sealing resin that is filled in the case.

[0094] (2) In the capacitor module of (1), the capacitor element may be composed of a laminate of dielectric films, and the glass transition point of the dielectric films may be 120° C. or higher.

[0095] (3) In the capacitor module of (1) or (2), the side surface of the capacitor element may have a pair of flat portions and a pair of curved portions connecting the pair of flat portions, and the first bus bar may have a first extension portion connecting the first electrode contact portion and the first terminal portion and arranged along the flat portions.

[0096] (4) In the capacitor module of any one of (1) to (3), the second bus bar may have a second extension portion that connects the second electrode contact portion and the second terminal portion and is arranged along the flat portion.

[0097] (5) In the capacitor module of any one of (1) to (4), the first bus bar may have a third terminal portion extending from the first electrode contact portion and exposed from a surface of the case different from the terminal exposed surface, and the second bus bar may have a fourth terminal portion extending from the second electrode contact portion and exposed from a surface of the case different from the terminal exposed surface, and the first terminal portion and the second terminal portion may function as output terminals, and the third terminal portion and the fourth terminal portion may function as input terminals.

[0098] (6) In the capacitor module of (5), the first terminal portion and the second terminal portion may be AC ​​terminals, and the third terminal portion and the fourth terminal portion may be DC terminals.

[0099] (7) In the capacitor module of (5) or (6), the third terminal portion and the fourth terminal portion do not have to overlap in a plan view.

[0100] (8) In any one of the capacitor modules (1) to (7), a first through hole penetrating in the thickness direction is formed in the first electrode contact portion, and the outer shape of the first through hole forms a first mounting portion with a shape in which a portion of the first electrode contact portion protrudes toward the inside of the first through hole, and the first mounting portion has an end portion that approaches the terminal exposed surface connected to the first electrode contact portion; and a second through hole penetrating in the thickness direction is formed in the second electrode contact portion, and the outer shape of the second through hole forms a second mounting portion with a shape in which a portion of the second electrode contact portion protrudes toward the inside of the second through hole, and the second mounting portion has an end portion that approaches the terminal exposed surface connected to the second electrode contact portion.

[0101] (9) In any one of the capacitor modules (1) to (8), a first stud for electrically connecting the capacitor element to an external device is arranged on the first terminal portion, and a second stud for electrically connecting the capacitor element to an external device is arranged on the second terminal portion, and the first stud and the second stud may protrude in opposite directions.

[0102] The present invention is useful for film capacitors used in various electronic devices, electrical devices, industrial devices, vehicle devices, etc.

[0103] REFERENCE SIGNS LIST 10 Capacitor element 11 First end surface electrode 12 Second end surface electrode 13 Side surface 13a Flat portion 13b Curved portion 20 Case 20a First terminal exposed surface 20b Second terminal exposed surface 30 First bus bar 31 First electrode contact portion 32 First terminal portion 33 First extension portion 34 Third terminal portion 35 First through hole 36 First mounting portion 40 Second bus bar 41 Second electrode contact portion 42 Second terminal portion 43 Second extension portion 44 Fourth terminal portion 45 Second through hole 46 Second mounting portion 50 Insulator 50a First surface 50b Second surface 60 Sealing resin 70 First stud 80 Second stud 100 Capacitor module

Claims

1. a capacitor element having a first end surface electrode, a second end surface electrode, and a side surface connecting the first end surface electrode and the second end surface electrode; a case that houses the capacitor element; a plate-like first bus bar including: a first electrode contact portion connected to the first end surface electrode of the capacitor element and disposed along the first end surface electrode within the case; and a first terminal portion extending from a terminal exposed surface of the case provided along the side surface of the capacitor element toward the outside of the case; a plate-like second bus bar including: a second electrode contact portion connected to the second end surface electrode of the capacitor element and disposed along the second end surface electrode within the case; and a second terminal portion extending from the terminal exposed surface of the case toward the outside of the case and overlapping with the first terminal portion in a direction from the first end surface electrode toward the second end surface electrode; an insulator disposed between the first terminal portion and the second terminal portion, insulating the first terminal portion from the second terminal portion, and having a first surface in contact with one main surface of the first terminal portion and a second surface in contact with one main surface of the second terminal portion; A sealing resin filled in the case; Equipped with Capacitor module.

2. the capacitor element is formed of a laminate of dielectric films; The glass transition point of the dielectric film is 120° C. or higher. The capacitor module according to claim 1 .

3. the side surface of the capacitor element has a pair of flat portions and a pair of curved portions connecting the pair of flat portions, the first bus bar has a first extension portion that connects the first electrode contact portion and the first terminal portion and is disposed along the flat portion; The capacitor module according to claim 1 .

4. the second bus bar has a second extension portion that connects the second electrode contact portion and the second terminal portion and is disposed along the flat portion. The capacitor module according to claim 3 .

5. the first bus bar has a third terminal portion extending from the first electrode contact portion and exposed from a surface of the case different from the terminal exposure surface, the second bus bar has a fourth terminal portion extending from the second electrode contact portion and exposed from a surface of the case different from the terminal exposure surface, The first terminal portion and the second terminal portion function as output terminals, and the third terminal portion and the fourth terminal portion function as input terminals. The capacitor module according to claim 1 .

6. The first terminal portion and the second terminal portion are AC terminals, and the third terminal portion and the fourth terminal portion are DC terminals. The capacitor module according to claim 5 .

7. The third terminal portion and the fourth terminal portion do not overlap each other in a plan view. The capacitor module according to claim 5 .

8. a first through hole penetrating the first electrode contact portion in a thickness direction, an outer shape of the first through hole constitutes a first mounting portion in a shape in which a part of the first electrode contact portion protrudes toward an inside of the first through hole, and an end of the first mounting portion in a direction approaching the terminal exposed surface is connected to the first electrode contact portion, a second through hole penetrating in a thickness direction is formed in the second electrode contact portion, and an outer shape of the second through hole constitutes a second mounting portion in a shape in which a part of the second electrode contact portion protrudes toward an inside of the second through hole, and an end of the second mounting portion in a direction approaching the terminal exposed surface is connected to the second electrode contact portion; The capacitor module according to claim 1 .

9. a first stud is disposed on the first terminal portion for electrically connecting the capacitor element to an external device; a second stud is disposed on the second terminal portion for electrically connecting the capacitor element to an external device; The first stud and the second stud protrude in opposite directions. The capacitor module according to claim 1 .