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

Technical Field

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

Background Art

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

[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.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0008] According to the present invention, it is possible to provide a capacitor module that can reduce ESL (Electromagnetic Slip Load). [Brief explanation of the drawing]

[0009] [Figure 1A] Perspective view showing a capacitor module according to Embodiment 1 [Figure 1B] Figure 1A shows the capacitor module from a different angle. [Figure 2] Plan view of the capacitor module in Figure 1. [Figure 3] Perspective view of the capacitor module in Figure 1, with the case and sealing resin omitted. [Figure 4] Figure 3: Exploded perspective view of the capacitor module. [Figure 5A] Figure 3 is a perspective view showing the capacitor elements of the capacitor module. [Figure 5B] Plan view of the capacitor element in Figure 5A. [Figure 6] Cross-sectional view AA of the capacitor module in Figure 3. [Figure 7]Perspective view of the capacitor module of FIG. 3 seen from another angle [Figure 8] Cross-sectional view taken along line B-B of the capacitor module of FIG. 7

Mode for Carrying Out the Invention

[0010] (Background of the Invention) The capacitor module may be used in an in-vehicle inverter circuit such as a hybrid vehicle. When the capacitor module is used in an inverter circuit, since the driving frequency of the inverter circuit corresponds to a high frequency, if the ESL (equivalent series inductance) of the capacitor module is large, there is a problem that the surge voltage generated in the inverter circuit becomes large. Therefore, reducing the ESL has been an issue in the capacitor module.

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

[0012] The capacitor module according to the first aspect of the present invention includes a capacitor element having 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 for housing the capacitor element; a plate-shaped first bus bar connected to the first end face electrode of the capacitor element, having a first electrode contact portion disposed along the first end face electrode within the case, and a first terminal portion extending outward from the terminal exposed surface of the case; a plate-shaped second bus bar connected to the second end face electrode of the capacitor element, having a second electrode contact portion disposed along the second end face electrode within the case, and a second terminal portion extending outward from the terminal exposed surface of the case and overlapping the first terminal portion in plan view; An insulator disposed between the first terminal portion and the second terminal portion, insulating the first terminal portion and the second terminal portion, having 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; A sealing resin filled in the case; is provided.

[0013] With such a configuration, a capacitor module capable of reducing ESL can be provided.

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

[0015] With such a configuration, the heat resistance of the capacitor module can be improved. Therefore, a capacitor module capable of withstanding the temperature rise due to overlapping the first terminal portion and the second terminal portion can be provided.

[0016] In the capacitor module according to the third aspect of the present invention, 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 may have a first extension portion that connects the first electrode contact portion and the first terminal portion and is disposed along the flat portion.

[0017] With such a configuration, the side surface of the capacitor element and the first bus bar can be brought close to each other, so that ESL can be further reduced.

[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] This configuration allows the side of the capacitor element to be brought closer to the first busbar, thereby further reducing the ESL (Electromagnetic Slip Level).

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

[0021] This configuration allows the capacitor module to be equipped with charging terminals.

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

[0023] This configuration allows the capacitor module to be equipped with charging terminals.

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

[0025] This configuration allows for increased design flexibility in the capacitor module.

[0026] In a capacitor module according to the eighth aspect of the present invention, The first electrode contact portion has a first through-hole that penetrates in the thickness direction, and the outer shape of the first through-hole constitutes a first mounting portion in which a part of the first electrode contact portion protrudes toward the inside of the first through-hole, and the end of the first mounting portion in the direction approaching the terminal exposed surface is connected to the first electrode contact portion. A second through-hole is formed in the second electrode contact portion, penetrating in the thickness direction. The outer shape of the second through-hole constitutes a second mounting portion in which a part of the second electrode contact portion protrudes toward the inside of the second through-hole, and the end of the second mounting portion in the direction approaching the terminal exposed surface may be connected to the second electrode contact portion.

[0027] This configuration allows for a shorter current flow distance between the end electrode of the capacitor element and the first or second terminal of the busbar, thereby further reducing the ESL (Electromagnetic Slip Level).

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

[0029] This configuration allows the capacitor module to be easily connected to external devices.

[0030] Hereinafter, Embodiment 1 of the present invention will be described with reference to the attached drawings. In addition, each element is shown schematically in each figure for the sake of ease of explanation.

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

[0032] As shown in Figures 1A to 4, the capacitor module 100 comprises 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. In this embodiment, the capacitor element 10, a part of the first bus bar 30, and a part of the second bus bar 40 are housed in the case 20 and sealed with the sealing resin 60.

[0033] The following describes each component of the capacitor module 100.

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

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

[0036] The capacitor element 10 is a film capacitor composed of a laminate of dielectric films. More specifically, the capacitor element 10 is formed by stacking dielectric films, each having a metal vapor-deposited film on its surface, and then winding them. In this embodiment, the capacitor element 10 is formed into a columnar shape with an oval cross-section by pressing the wound dielectric film into a flattened shape.

[0037] As the dielectric film, for example, a dielectric film formed from a mixed resin solution containing phenoxy resin and MDI (diphenylmethane diisocyanate) can be used. Alternatively, a dielectric film formed from a mixed resin solution containing polyvinyl acetal (PVAA) and ethyl acetate may be used. By forming a dielectric film with such a mixed resin solution, the glass transition temperature of the dielectric film can be set to 120°C or higher, thereby improving the heat resistance of the capacitor module. As the metal vapor-deposited film formed on the surface of the dielectric film, for example, metals such as Al and Zn can be used.

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

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

[0040] As shown in Figure 2, case 20 has a first terminal exposure surface 20a and a second terminal exposure surface 20b that is different from the first terminal exposure surface 20a. The first terminal exposure surface 20a exposes the first terminal portion 32 of the first busbar 30 and the second terminal portion 42 of the second busbar 40 (see Figures 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 exposure surface 20a of 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 exposure surface 20b.

[0041] Case 20 is formed from, for example, a synthetic resin such as polyphenylene sulfide (PPS resin) or polybutylene terephthalate (PBT resin).

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

[0043] The first busbar 30 is formed from a conductive material, such as a plate-shaped metal. As shown in Figures 3 and 4, the first busbar 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 face electrode 11 of the capacitor element 10 and is positioned along the first end face electrode 11 inside the case 20. The first electrode contact portion 31 is spread out in the XY plane so as to contact the first end face electrode 11 of all capacitor elements 10 of 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 busbar 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 busbar 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 side opposite to the first terminal portion 32 of the first electrode contact portion 31.

[0044] Figure 6 is a cross-sectional view of the capacitor module shown in Figure 3. As shown in Figures 3 and 6, the first electrode contact portion 31 is positioned to contact the first end face 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. Of the first busbar 30, the first terminal portion 32 and the third terminal portion 34 are positioned exposed from the case 20.

[0045] By positioning the first extension portion 33 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 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 direct current flows through the third terminal 34. The third terminal 34 can be used as a charging terminal for the capacitor module 100.

[0047] As shown in Figure 3, a first through-hole 35 is formed in the first electrode contact portion 31, penetrating in the thickness direction of the first busbar 30. The outer shape of the first through-hole 35 constitutes a first mounting portion 36 in which a part of the first electrode contact portion 31 protrudes toward the inside of the first through-hole 35, and the first mounting portion 36 is integrally formed with the first electrode contact portion 31. By connecting the first mounting portion 36 and the first end face electrode 11 of the capacitor element 10 with solder, the first busbar 30 and the first end face electrode 11 of the capacitor element 10 are electrically connected.

[0048] In this embodiment, twelve first through-holes 35 and first mounting portions 36 are formed in the first electrode contact portion 31, and in a plan view, two first mounting portions 36 are arranged for the first end face electrode 11 of one capacitor element 10. 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, but can be any number that allows each capacitor element 10 to be electrically connected to the first busbar 30.

[0049] <Second bus bar> Figure 7 is a perspective view of the capacitor module shown in Figure 3 from a different angle. Figure 8 is a cross-sectional view of the capacitor module shown in Figure 7, specifically a cross-sectional view of section B.

[0050] The second busbar 40 is a terminal for electrically connecting the second end face electrode 12 of the capacitor element 10 to the terminal of an external device (not shown). Since the basic configuration of the second busbar 40 is the same as that of the first busbar 30, its explanation will be omitted as appropriate.

[0051] As shown in Figures 4 and 7, the second busbar 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 face electrode 12 of the capacitor element 10 and is positioned along the second end face electrode 12 inside the case 20. The second terminal portion 42 extends toward the first terminal exposed surface 20a of the case 20. In this embodiment, the second busbar 40 also has a second extension portion 43 connecting the second electrode contact portion 41 and the second terminal portion 42. In this embodiment, the second busbar 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 this embodiment, the fourth terminal portion 44 is provided on the side of the second electrode contact portion 41 opposite to the second terminal portion 42.

[0052] As shown in Figure 8, the second electrode contact portion 41 is positioned to contact the second end face 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 positioned along the flat portion 13a of the capacitor element 10, alongside the first extension portion 33 of the first busbar 30. A fourth terminal portion 44 extends from the other end of the second electrode contact portion 41. Of the second busbar 40, the second terminal portion 2 and the fourth terminal portion 44 are positioned exposed from the case 20.

[0053] By arranging the second extension 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 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 direct current flows through the fourth terminal 44. The fourth terminal 44 can be used as a charging terminal for the capacitor module 100.

[0055] As shown in Figure 7, a second through-hole 45 is formed in the second electrode contact portion 41, penetrating in the thickness direction of the second busbar 40. The outer shape of the second through-hole 45 forms a second mounting portion 46 in which a part of the second electrode contact portion 41 protrudes toward the inside of the second through-hole 45, and the second mounting portion 46 is integrally formed with the second electrode contact portion 41. By connecting the second mounting portion 46 and the second end face electrode 12 of the capacitor element 10 with solder, the second busbar 40 and the second end face electrode 12 of the capacitor element 10 are electrically connected.

[0056] In this embodiment, twelve second through-holes 45 and second mounting portions 46 are formed in the second electrode contact portion 41, and in a plan view, two second mounting portions 46 are arranged for the second end face electrode 12 of one capacitor element 10. 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, but can be any number that allows each capacitor element 10 to be electrically connected to the second busbar 40.

[0057] As shown in Figures 3 and 6-8, the first terminal portion 32 of the first busbar 30 and the second terminal portion 42 of the second busbar 40 are arranged to overlap in the Z direction in a plan view. Since an insulator 50 is placed between the first terminal portion 32 and the second terminal portion 42, the first terminal portion 32 and the second terminal portion 42 are electrically insulated from each other.

[0058] In this embodiment, as shown in Figure 2, the third terminal portion 34 and the fourth terminal portion 44 do not overlap in a plan view. In other words, the third terminal portion 34 and the fourth terminal portion 44 are positioned at offset locations in the XY direction.

[0059] <insulator> The insulator 50 is a sheet-like member that is placed between the first terminal portion 32 and the second terminal portion 42 to insulate them. By placing the insulator 50 between the first terminal portion 32 and the second terminal portion 42, short circuits between the terminal portions can be prevented. The insulator 50 is formed from, for example, insulating paper or insulating resin. As shown in Figures 6 and 8, the insulator 50 has a first surface 50a and a second surface 50b. The first surface 50a of the insulator 50 is in contact with one main surface of the first terminal portion 32, and the second surface 50b of the insulator 50 is in contact with one main surface of the second terminal portion 42. In order to reduce the distance between the first terminal portion 32 and the second terminal portion 42, it is preferable that the thickness of the insulator 50 be as thin as possible while still being able to adequately insulate the first terminal portion 32 and the second terminal portion 42.

[0060] <Sealing resin> As shown in Figure 1, the sealing resin 60 is filled into the case 20 to seal the six capacitor elements 10 housed in the case 20, as well as a portion of the first busbar 30 and the second busbar 40. The 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 adhesion for the sealing resin 60.

[0061] <Stud> In this embodiment, a first stud 70 for connecting the first end face electrode 11 of the capacitor element 10 to an external device is positioned on the first terminal portion 32 of the first busbar 30. A second stud 80 for connecting the second end face electrode 12 of the capacitor element 10 to an external device is positioned on the second terminal portion 42 of the second busbar 40. The first stud 70 and the second stud 80 protrude in opposite directions in the Z direction. This arrangement of the first stud 70 and the second stud 80 allows for easy connection between the external device and either the first terminal portion 32 or the second terminal portion 42, even when the first terminal portion 32 and the second terminal portion 42 overlap.

[0062] The first stud 70 and the second stud 80 can be made up of, for example, self-clinching studs that are press-fitted into the terminal portion. By making the first stud 70 and the second stud 80 of self-clinching studs, the first terminal portion 32 and the second terminal portion 42 can be arranged in parallel and overlapping, thereby further reducing the ESL of the capacitor module 100. Alternatively, the first stud 70 and the second stud 80 may be made up of screws or the like.

[0063] As shown in Figure 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 an appropriate number should be arranged for connecting external devices.

[0064] [Operation] The following explains what happens when current is passed through the capacitor module 100.

[0065] In the capacitor module 100, by arranging the first terminal section 32 and the second terminal section 42 to overlap in the Z direction, when voltages of different polarities are applied to the first busbar 30 and the second busbar 40, currents flow in opposite directions through the first terminal section 32 and the second terminal section 42. In this case, the magnetic field caused by the current flowing through the first terminal section 32 and the magnetic field caused by the current flowing through the second terminal section 42 cancel each other out, thereby reducing the ESL of the capacitor module 100. In particular, current concentrates at the first terminal section 32 and the second terminal section 42 because they are the input and output points of the current. For this reason, the effect of reducing ESL by overlapping the first terminal section 32 and the second terminal section 42 is significant.

[0066] When the first terminal portion 32 and the second terminal portion 42 are placed close together and overlapped, the heat transfer properties of the capacitor module 100 increase, and the first terminal portion 32 and the second terminal portion 42 tend to generate heat when current flows. Furthermore, since both the first extension portion 33 and the second extension portion 43 are arranged along the side surface of the capacitor element 10, the core temperature of the capacitor element 10 tends 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, so that the heat resistance can be increased compared to conventional capacitor elements. For this reason, the capacitor module 100 has heat resistance against the rise in the core temperature of the capacitor element 10.

[0067] As shown in Figures 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 to be longer than the second extension portion 43. Since the lengths of the first extension portion 33 and the second extension portion 43 do not significantly affect the reduction of ESL of the capacitor module 100, 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, the extension portion may be formed on only one of the first busbar 30 or the second busbar 40.

[0068] Furthermore, 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. Because the first mounting portion 36 is connected to the first electrode contact portion 31 in the direction approaching 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, contributing to the reduction of ESL of the capacitor module 100.

[0069] Similarly, the end of the second mounting portion 46 that approaches the first terminal exposed surface 20a of the case 20 is connected to the second electrode contact portion 41. Because the second mounting portion 46 is connected to the second electrode contact portion 41 in the direction approaching 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, contributing to the reduction of ESL of the capacitor module 100.

[0070] Furthermore, in this embodiment, the third terminal portion 34 and the fourth terminal portion 44 are arranged without overlapping. The third terminal portion 34 and the fourth terminal portion 44 are terminals used for charging the capacitor module 100, and DC current flows through them. Therefore, even if the third terminal portion 34 and the fourth terminal portion 44 do not overlap, the impact on reducing the ESL of the capacitor module 100 is small.

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

[0072] The capacitor module 100 comprises a capacitor element 10, a case 20, a first busbar 30, a second busbar 40, an insulator 50, and a sealing resin 60. The capacitor element 10 has a first end face electrode 11, a second end face electrode 12, and a side surface 13 connecting the first end face electrode 11 and the second end face electrode 12. The case 20 houses the capacitor element 10. The first busbar 30 has a first electrode contact portion 31 connected to the first end face electrode 11 of the capacitor element 10 and positioned along the first end face electrode 11 within the case 20, and a first terminal portion 32 extending toward the first terminal exposed surface 20a of the case 20. The second busbar 40 is connected to the second end face electrode 12 of the capacitor element 10 and has a second electrode contact portion 41 positioned along the second end face electrode 12 within 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 positioned between the first terminal portion 32 and the second terminal portion 42 to insulate the first terminal portion 32 and the second terminal portion 42, and has a first surface 50a that contacts one main surface of the first terminal portion 32, and a second surface 50b that contacts one main surface of the second terminal portion 42. The sealing resin 60 is filled into the case 20.

[0073] This configuration makes it possible to reduce the ESL of the capacitor module 100.

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

[0075] This configuration makes it possible to provide a capacitor module with high heat resistance. By overlapping the first terminal portion 32 and the second terminal portion 42, heat transfer is improved, and heat is more easily transferred between the terminals, leading to a temperature rise in the capacitor module 100. By using a capacitor element 10 made of a laminate of highly heat-resistant dielectric films with a glass transition temperature 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 13a and a pair of curved portions 13b connecting the pair of flat portions 13a. The first busbar 30 has a first extension portion 33 that connects the first electrode contact portion 31 and the first terminal portion 32 and is arranged along the flat portion 13a.

[0077] This configuration allows the side surface 13 of the capacitor element 10 and the first busbar 30 to be brought into close proximity, thereby further reducing the ESL of the capacitor module 100.

[0078] The second busbar 40 has a second extension portion 43 that connects the second electrode contact portion 41 and the second terminal portion 42 and is arranged along the flat portion 13a.

[0079] This configuration allows the side surface 13 of the capacitor element 10 and the first busbar 30 to be brought into close proximity, thereby further reducing the ESL of the capacitor module 100.

[0080] The first busbar 30 has a third terminal portion 34 that extends from the first electrode contact portion 31 and is exposed from a side different from the first terminal exposed surface 20a of the case 20. The second busbar 40 has a fourth terminal portion 44 that extends from the second electrode contact portion 41 and is exposed from a side different from the first terminal exposed surface 20a of the case 20. 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] This configuration allows the capacitor module 100 to be provided with charging terminals.

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

[0083] This configuration allows the capacitor module 100 to be provided with charging terminals.

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

[0085] This configuration improves the design flexibility of the capacitor module 100.

[0086] A first through-hole 35 is formed in the first electrode contact portion 31, penetrating in the thickness direction. The outer shape of the first through-hole 35 constitutes a first mounting portion 36 in which a part 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 in the direction approaching the first terminal exposed surface 20a is connected to the first electrode contact portion 31. A second through-hole 45 is formed in the second electrode contact portion 41, penetrating in the thickness direction. The outer shape of the second through-hole 45 constitutes a second mounting portion 46 in which a part 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 in the direction approaching the first terminal exposed surface 20a is connected to the second electrode contact portion 41.

[0087] This configuration allows for a reduction in the current flow distance from the first end face electrode 11 to the first terminal portion 32, and from the second end face electrode 12 to the second terminal portion 42. As a result, the ESL of the capacitor module 100 can be further reduced.

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

[0089] This configuration allows the capacitor module 100 to be easily connected to an external device.

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

[0091] Furthermore, although the above-described embodiment described an example in which the capacitor element 10 is formed in a columnar shape having an oval cross-section, the embodiment is not limited to this. The capacitor element 10 may be formed in a cylindrical shape or a polygonal prism shape such as a rectangular prism, for example.

[0092] Furthermore, although the above-described embodiment describes an example in which an insulator 50 is placed between the first terminal portion 32 and the second terminal portion 42, the 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 portion 32 or the main surface of the second terminal portion 42.

[0093] (Summary of the embodiment) (1) The capacitor module of the present invention comprises a capacitor element having 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 housing the capacitor element; a plate-shaped first busbar having a first electrode contact portion connected to the first end face electrode of the capacitor element and arranged along the first end face electrode within the case, and a first terminal portion extending from the terminal exposed surface of the case toward the outside of the case; a plate-shaped second busbar having a second electrode contact portion connected to the second end face electrode of the capacitor element and arranged along the second end face 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 plan view; an insulator disposed between the first terminal portion and the second terminal portion to insulate the first terminal portion and the second terminal portion, and having 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 into the case.

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

[0095] (3) In the capacitor module of (1) or (2), 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, and the first busbar may have a first extension portion that connects the first electrode contact portion and the first terminal portion and is arranged along the flat portion.

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

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

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

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

[0100] (8) In any one of the capacitor modules from (1) to (7), the first electrode contact portion has a first through-hole that penetrates in the thickness direction, and the outer shape of the first through-hole constitutes a first mounting portion in which a part of the first electrode contact portion protrudes toward the inside of the first through-hole, and the end of the first mounting portion in the direction approaching the exposed terminal surface is connected to the first electrode contact portion. The second electrode contact portion has a second through-hole that penetrates in the thickness direction, and the outer shape of the second through-hole constitutes a second mounting portion in which a part of the second electrode contact portion protrudes toward the inside of the second through-hole, and the end of the second mounting portion in the direction approaching the exposed terminal surface may be connected to the second electrode contact portion.

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

[0102] This invention is useful for film capacitors used in various electronic devices, electrical equipment, industrial equipment, vehicle equipment, etc. [Explanation of symbols]

[0103] 10 Capacitor element 11 First end electrode 12 Second end electrode 13 Side view 13a Flat area 13b Curved section 20 cases 20a 1st terminal exposed surface 20b 2nd terminal exposed surface 30 First Bus Bar 31 1st electrode contact part 32 1st terminal section 33 1st extension section 34 3rd terminal section 35 First through hole 36. First Implementation Section 40 Second Bus Bar 41 2nd electrode contact part 42 2nd terminal section 43 2nd extension section 44 4th terminal section 45 Second through hole 46 Second Implementation Section 50 Insulator 50a Page 1 50b 2nd side 60 Sealing resin 70 First Stud 80 Stud 2 100 Capacitor Module

Claims

1. A capacitor element having a first end electrode, a second end electrode, and a side surface connecting the first end electrode and the second end electrode, A case for housing the aforementioned capacitor element, A plate-shaped first busbar having a first electrode contact portion connected to the first end face electrode of the capacitor element and arranged along the first end face electrode within the case, and a first terminal portion extending outward from the terminal exposed surface of the case provided along the side surface of the capacitor element, A plate-shaped second busbar having a second electrode contact portion connected to the second end face electrode of the capacitor element and arranged along the second end face 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 the direction toward the second end face electrode, An insulator disposed between the first terminal portion and the second terminal portion, insulating the first terminal portion and the second terminal portion, having 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, The sealing resin that is filled into the aforementioned case, Equipped with, The first terminal section is provided with a plurality of first studs for electrically connecting the capacitor element to an external device. The second terminal portion is provided with a plurality of second studs for electrically connecting the capacitor element to an external device. The plurality of first studs protrude from the first terminal portion in a first direction toward the first end face electrode from the second end face electrode, and are arranged in a second direction that is perpendicular to the first direction and is along the exposed surface of the terminal. The plurality of second studs protrude from the second terminal portion in the opposite direction to the first direction and are arranged in the same direction as the second direction. Capacitor module.

2. A capacitor element having a first end electrode, a second end electrode, and a side surface connecting the first end electrode and the second end electrode, A case for housing the aforementioned capacitor element, A plate-shaped first busbar having a first electrode contact portion connected to the first end face electrode of the capacitor element and arranged along the first end face electrode within the case, and a first terminal portion extending outward from the terminal exposed surface of the case provided along the side surface of the capacitor element, A plate-shaped second busbar having a second electrode contact portion connected to the second end face electrode of the capacitor element and arranged along the second end face 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 the direction toward the second end face electrode, An insulator disposed between the first terminal portion and the second terminal portion, insulating the first terminal portion and the second terminal portion, having 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, The sealing resin that is filled into the aforementioned case, Equipped with, A first stud is provided at the first terminal portion for electrically connecting the capacitor element to an external device. A second stud is provided at 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 first stud is composed of a self-clinching stud that is press-fitted into the first terminal portion. The second stud is composed of a self-clinching stud that is press-fitted into the second terminal portion. Capacitor module.

3. The capacitor element is composed of a laminate of dielectric films, The glass transition temperature of the dielectric film is 120°C or higher. A capacitor module according to claim 1 or 2.

4. 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 busbar has a first extension portion that connects the first electrode contact portion and the first terminal portion and is arranged along the flat portion. A capacitor module according to claim 1 or 2.

5. The second busbar has a second extension portion that connects the second electrode contact portion and the second terminal portion and is arranged along the flat portion. The capacitor module according to claim 4.

6. The first busbar has a third terminal portion that extends from the first electrode contact portion and is exposed from a surface different from the terminal exposure surface of the case, The second busbar has a fourth terminal portion that extends from the second electrode contact portion and is exposed from a surface different from the terminal exposure surface of the case. The first terminal section and the second terminal section function as output terminals, and the third terminal section and the fourth terminal section function as input terminals. A capacitor module according to claim 1 or 2.

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

8. The third terminal portion and the fourth terminal portion do not overlap in a plan view. The capacitor module according to claim 6.

9. The first electrode contact portion has a first through-hole that penetrates in the thickness direction, and the outer shape of the first through-hole constitutes a first mounting portion in which a part of the first electrode contact portion protrudes toward the inside of the first through-hole, and the end of the first mounting portion in the direction approaching the terminal exposed surface is connected to the first electrode contact portion. The second electrode contact portion has a second through-hole that penetrates in the thickness direction, and the outer shape of the second through-hole constitutes a second mounting portion in which a part of the second electrode contact portion protrudes toward the inside of the second through-hole, and the end of the second mounting portion in the direction approaching the terminal exposed surface is connected to the second electrode contact portion. A capacitor module according to claim 1 or 2.