Capacitor module

Abstract

The present invention provides a capacitor module that can reduce inductance while miniaturizing the capacitor module. [Solution] The capacitor module of this disclosure comprises a capacitor element having a first electrode, a second electrode, and a side surface; a first busbar electrically connected to the first electrode; and a second busbar electrically connected to the second electrode, wherein the first busbar has a first extension, a first connection, a second extension, and a first terminal; and the second busbar has a second contact, a third extension, a second connection, a fourth extension, and a second terminal, wherein the second extension and the fourth extension are arranged to overlap at least a portion when viewed from a direction perpendicular to the planes on which the second and fourth extensions extend.

Description

Technical Field

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

Background Art

[0002] A capacitor module is known in which bus bars are connected to respective electrodes of one or more capacitor elements, housed in a case, and sealed with resin.

[0003] For example, Patent Document 1 discloses a bus bar structure having a capacitor element, first and second bus bars, an insulator, and a molding resin.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the bus bar structure described in Patent Document 1, there is still room for improvement in reducing inductance without increasing the size of the capacitor module.

[0006] The present disclosure provides a capacitor module capable of reducing inductance while miniaturizing the capacitor module.

Means for Solving the Problems

[0007] A capacitor module according to an aspect of the present disclosure includes a capacitor element having a first electrode, a second electrode, and a side surface connecting the first electrode and the second electrode, a first bus bar electrically connected to the first electrode, a second bus bar electrically connected to the second electrode, Equipped with, The first busbar has a first contact portion that contacts the first electrode, a first extension portion that extends from the first contact portion toward the second electrode in a direction along the side surface, a first connecting portion that extends from the first extension portion toward the side surface, a second extension portion that extends from the first connecting portion toward the second electrode in a direction along the side surface, and a first terminal portion that extends from the second extension portion toward the side surface. The second busbar has a second contact portion that contacts the second electrode, a third extension portion that extends from the second contact portion toward the first electrode in a direction along the side surface, a second connecting portion that extends from the third extension portion toward the side surface, a fourth extension portion that extends from the second connecting portion toward the second electrode in a direction along the side surface, and a second terminal portion that extends from the fourth extension portion toward the side surface. In a direction perpendicular to the aforementioned side surface, the second extension and the fourth extension are arranged to overlap by at least a portion. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide a capacitor module that can reduce inductance while miniaturizing the capacitor module. [Brief explanation of the drawing]

[0009] [Figure 1] Perspective view showing a capacitor module according to Embodiment 1 [Figure 2A] A perspective view showing the capacitor elements, first busbar, and second busbar of the capacitor module in Figure 1. [Figure 2B] Figure 2A is a perspective view of the capacitor module from a different angle. [Figure 3] A perspective view showing the capacitor elements built into the capacitor module in Figure 1. [Figure 4A] Perspective view showing the first busbar included in the capacitor module of Figure 1. [Figure 4B] Figure 4A shows the first busbar viewed from the width direction (Y direction). [Figure 4C] Exploded perspective view of FIG. 4A [Figure 5A] Perspective view showing the second bus bar included in the capacitor module of FIG. 1 [Figure 5B] View of the second bus bar of FIG. 5A as seen from the width direction (Y direction) [Figure 5C] Exploded perspective view of FIG. 5A [Figure 6] Cross-sectional view taken along line A-A of FIG. 1 [Figure 7] Enlarged view of region R1 of FIG. 6 [Mode for Carrying Out the Invention]

[0010] (Background Leading to the Present Disclosure) In a capacitor module, generally in a high-frequency region higher than the resonance frequency, the impedance increases in proportion to the inductance. When the impedance increases, the amount of heat generated by the capacitor module increases, and it may exceed the guaranteed temperature of the capacitor module. Therefore, reducing the inductance to suppress the increase in impedance and reduce the amount of heat generated by the capacitor module has been studied.

[0011] For example, Patent Document 1 discloses a bus bar structure having a capacitor element, first and second bus bars, an insulator, and a molding resin. In the bus bar structure of Patent Document 1, it is disclosed that the inductance is reduced by arranging the opposing plate portions of the pair of bus bars close to each other.

[0012] However, in the bus bar structure of Patent Document 1, due to restrictions on the size of the case of the capacitor module or the space of the mounting destination of the capacitor module, there is a limit to increasing the area of the portion where the bus bars face each other. For this reason, there is a problem that the inductance cannot be sufficiently reduced.

[0013] Therefore, the inventors of the present invention have studied a capacitor module capable of reducing the inductance without increasing the size, and have arrived at the following invention.

[0014] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each figure, each element is shown exaggerated for ease of explanation.

[0015] (Embodiment 1) [Overall Configuration] FIG. 1 is a perspective view showing a capacitor module 1 according to Embodiment 1. FIG. 2A is a perspective view showing a capacitor element 10, a first bus bar 20, and a second bus bar 30 of the capacitor module 1 in FIG. 1. FIG. 2B is a perspective view of the capacitor module 1 in FIG. 2A viewed from another direction. In FIG. 2B, the insulating paper 60 is omitted. In the figure, the X direction, the Y direction, and the Z direction indicate the depth direction, the width direction, and the height direction of the capacitor module 1, respectively.

[0016] As shown in FIGS. 1 to 2B, the capacitor module 1 includes a capacitor element 10, a first bus bar 20, and a second bus bar 30. In the present embodiment, as shown in FIGS. 2A to 2B, the capacitor module 1 includes three capacitor elements 10. Further, in the capacitor module 1, the capacitor element 10 and a part of the first bus bar 20 and the second bus bar 30 are housed in a case 40 and sealed with a sealing resin 50. First terminal portions 25 and second terminal portions 35, which will be described later, of the first bus bar 20 and the second bus bar 30 are exposed from the sealing resin 50 and function as external terminals of the capacitor module 1.

[0017] [Capacitor Element] FIG. 3 is a perspective view showing a capacitor element 10 incorporated in the capacitor module 1 in FIG. 1. As shown in FIG. 3, the capacitor element 10 has a first electrode 11, a second electrode 12, and a side surface 13 connecting the first electrode 11 and the second electrode 12. The first electrode 11 and the second electrode 12 are provided on both end faces of the capacitor element 10.

[0018] In this embodiment, the capacitor element 10 is formed in a columnar shape with an oval end face. That is, the first electrode 11 and the second electrode 12 have an oval shape, and the capacitor element 10 is formed in a columnar shape.

[0019] 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.

[0020] 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 tolylene diisocyanate (TDI) 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.

[0021] A first electrode 11 is formed on one end face of the wound dielectric film, and a second electrode 12 is formed on the other end face. The first electrode 11 and the second electrode 12 can be formed, for example, by thermal spraying a conductive material containing a metal such as Al or Zn onto the end face of the wound dielectric film.

[0022] The capacitor element 10 is not limited to a film capacitor, but may be other types of capacitors such as ceramic capacitors or electrolytic capacitors.

[0023] In this embodiment, as shown in Figures 2A to 2B, the capacitor module 1 includes three capacitor elements 10.

[0024] <First bus bar> Figure 4A is a perspective view showing the first busbar 20 included in the capacitor module 1 of Figure 1. Figure 4B is a view of the first busbar 20 of Figure 4A from the width direction (Y direction). Figure 4C is an exploded perspective view of Figure 4A.

[0025] The first busbar 20 is a component for electrically connecting the first electrode 11 of each capacitor element 10 to the terminals of an external device (not shown).

[0026] The first busbar 20 is formed from a conductive material such as a plate-shaped metal. The first busbar 20 has a first contact portion 21, a first extension portion 22, a first connecting portion 23, a second extension portion 24, and a first terminal portion 25.

[0027] In this embodiment, the first busbar 20 is formed by joining together two members: a first portion 20a consisting of a first contact portion 21, a first extension portion 22, and a first connecting portion 23, and a second portion 20b consisting of a second extension portion 24 and a first terminal portion 25.

[0028] The first part 20a includes a first contact portion 21, a first extension portion 22 extending from the first contact portion 21, and a first connecting portion 23 extending from the first extension portion 22.

[0029] As shown in Figure 2A, the first contact portion 21 is the part that contacts the first electrode 11 of the capacitor element 10 and electrically connects the first electrode 11 and the first busbar 20. The connection between the first contact portion 21 and the first electrode 11 is made by, for example, soldering. The first extension portion 22 is arranged along the side surface 13 of the capacitor element 10, extending from the end of the first contact portion 21 toward the second electrode 12 of the capacitor element 10. The first connection portion 23 is arranged extending from the first extension portion 22 toward the side surface 13 of the capacitor element 10. In this embodiment, the first connection portion 23 extends in a direction perpendicular to the side surface 13 of the capacitor element 10.

[0030] In this embodiment, three first extensions 22 extend from the first contact portion 21. Furthermore, a first connection portion 23 extends from each of the three first extensions 22. The number of first extensions 22 and first connection portions 23 can be set, for example, to match the number of capacitor elements 10 included in the capacitor module 1.

[0031] As shown in Figure 4A, the second portion 20b has a second extension portion 24 and a first terminal portion 25.

[0032] The second extension portion 24 is connected to the first connection portion 23 and extends from the first connection portion 23 toward the second electrode 12 of the capacitor element 10 in a direction along the side surface 13 of the capacitor element 10. The first terminal portion 25 extends from the second extension portion 24 toward the side surface 13 of the capacitor element 10. In this embodiment, the first terminal portion 25 extends in a direction perpendicular to the side surface 13 of the capacitor element 10.

[0033] In this embodiment, the second extension portion 24 has a first main body portion 24a and a first projection portion 24b. The first main body portion 24 is formed in a plate shape. The first projection portion 24b protrudes from the first main body portion 24a toward the first connecting portion 23. As described above, in this embodiment, three first connecting portions 23 are provided, so three first projection portions 24b protrude from the first main body portion 24a. Therefore, in a plan view from the Z direction, the second extension portion 24 is formed in a comb shape. In other words, the first projection portion 24b is formed in a comb-like shape protruding from the first main body portion 24a.

[0034] By connecting the first protrusion 24b and the first connecting portion 23, the first portion 20a and the second portion 20b are joined together to form the first busbar 20. Specifically, as shown in Figure 4C, for example, the first portion 20a and the second portion 20b are joined by inserting the tip 23a of the first connecting portion 23 into the through hole 24c provided in the first protrusion 24b of the second extension portion 24 and connecting them with solder or the like.

[0035] The first main body portion 24a is provided with a notch 24d. Specifically, in the first main body portion 24a, the portion connecting adjacent first protrusions 24b is cut out in a polygonal shape to form the notch 24d. By providing the notch 24d in the first main body portion 24a, the creepage distance between the first bus bar 20 and the second bus bar 30 can be secured as shown in Figure 2A, thereby improving the reliability of the capacitor module 1.

[0036] As shown in Figure 1, of the first busbar 20, except for the first terminal portion 25, the first contact portion 21, the first extension portion 22, the first connection portion 23, and the second extension portion 24 are sealed in the sealing resin 50 and are not exposed to the outside of the capacitor module 1. On the other hand, of the first busbar 20, the first terminal portion 25 is exposed from the sealing resin 50.

[0037] <Second bus bar> Figure 5A is a perspective view showing the second busbar 30 included in the capacitor module 1 of Figure 1. Figure 5B is a view of the second busbar 30 of Figure 5A from the width direction (Y direction). Figure 5C is an exploded perspective view of Figure 5A. The second busbar 30 is for electrically connecting the second electrode 12 of each capacitor element 10 to the terminals of an external device (not shown).

[0038] The second busbar 30, like the first busbar 20, is formed from a conductive material such as a plate-shaped metal. The second busbar 30 has a second contact portion 31, a third extension portion 32, a second connection portion 33, a fourth extension portion 34, and a second terminal portion 35. In this embodiment, the second busbar 30 is formed by connecting two members: a third portion 30a composed of the second contact portion 31, the third extension portion 32, and the second connection portion 33, and a fourth portion 30b composed of the fourth extension portion 34 and the second terminal portion 35.

[0039] The third portion 30a includes a second contact portion 31, a third extension portion 32 extending from the second contact portion 31, and a second connection portion 33 extending from the third extension portion 32. As shown in Figure 2B, the second contact portion 31 is the portion that contacts the second electrode 12 of the capacitor element 10 and electrically connects the second electrode 12 and the second busbar 30. The connection between the second contact portion 31 and the second electrode 12 is made, for example, by soldering. The third extension portion 32 is positioned along the side surface 13 of the capacitor element 10, extending from the end of the second contact portion 31 toward the second electrode 12 of the capacitor element 10. The second connection portion 33 is positioned extending from the third extension portion 32 toward the side surface 13 of the capacitor element 10. In this embodiment, the second connection portion 33 is formed extending in a direction perpendicular to the side surface 13 of the capacitor element 10.

[0040] In this embodiment, as shown in Figure 5C, the third extension portion 32 is formed with the same width as the second contact portion 31. Furthermore, three second connection portions 33 extend from the end of the third extension portion 32. The number of second connection portions 33 can be set to match the number of capacitor elements 10 included in the capacitor module 1, similar to the first connection portion 23. The number of first connection portions 23 and second connection portions 33 may be the same or different.

[0041] The fourth portion 30b has a fourth extension 34 and a second terminal portion 35. The fourth extension 34 is connected to the second connection 33 and extends from the second connection 33 toward the second electrode 12 of the capacitor element 10 in a direction along the side surface 13 of the capacitor element 10. The second terminal portion 35 extends from the fourth extension 34 toward the side surface 13 of the capacitor element 10. In this embodiment, the second terminal portion 35 is formed extending in a direction perpendicular to the side surface 13 of the capacitor element 10.

[0042] In this embodiment, the fourth extension portion 34 has a plate-shaped second main body portion 34a and a second projection portion 34b that protrudes from the second main body portion 34a toward the second connecting portion 33. As described above, in this embodiment, three second connecting portions 33 are provided, so three second projection portions 34b protrude from the second main body portion 34a. Therefore, in a plan view from the Z direction, the fourth extension portion 34 is formed in a comb shape. In other words, the second projection portions 34b are formed in a comb-like shape that protrudes from the second main body portion 34a.

[0043] By connecting the second protrusion 34b and the second connecting portion 33, the third portion 30a and the fourth portion 30b are joined together to form the second busbar 30. Specifically, as shown in Figure 5C, the third portion 30a and the fourth portion 30b can be joined, for example, by inserting the tip 33a of the second connecting portion 33 into the through hole 34c provided in the second protrusion 34b of the fourth extension portion 34 and connecting them with solder or the like.

[0044] Unlike the shape of the first main body 24a, the second main body 34a does not have a notch. Specifically, in the second main body 34a, the portion connecting adjacent second protrusions 34b is formed in a straight line.

[0045] As shown in Figure 2A, when viewed from a direction perpendicular to the extending surfaces of the second extension portion 24 and the fourth extension portion 34 (Z direction), the first protrusion 24b of the second extension portion 24 and the second protrusion 34b of the fourth extension portion 34 are arranged alternately. The alternating arrangement of the first protrusion 24b and the second protrusion 34b ensures sufficient creepage distance between the first busbar 20 and the second busbar 30, thereby improving the reliability of the capacitor module 1.

[0046] As shown in Figure 1, the second contact portion 31, the third extension portion 32, the second connection portion 33, and the fourth extension portion 34 of the second busbar 30 are sealed in the sealing resin 50 and are not exposed to the outside of the capacitor module 1. On the other hand, the second terminal portion 35 of the second busbar 30 is exposed from the sealing resin 50.

[0047] <Case> Case 40 is a case for housing components such as the capacitor element 10. As shown in Figure 1, case 40 has, for example, a roughly rectangular parallelepiped shape and has an opening 41. Case 40 has a bottom surface 42 (see Figure 6) on the opposite side of the opening 41. Therefore, case 40 is formed in a box shape with an opening 41. Case 40 houses the capacitor element 10 and a portion of the first busbar 20 and the second busbar 30.

[0048] Case 40 is formed from, for example, a synthetic resin such as polyphenylene sulfide (PPS resin) or polybutylene terephthalate (PBT resin).

[0049] <Sealing resin> As shown in Figure 1, the sealing resin 50 is filled into the case 40 to seal the capacitor element 10 housed in the case 40 and a portion of the first busbar 20 and the second busbar 30. The sealing resin 50 is made of a thermosetting resin such as epoxy resin or urethane resin. A material with high fluidity and adhesion may be used as the material for the sealing resin 50.

[0050] <Placement of the first and second busbars> The arrangement of the first busbar 20 and the second busbar 30 in the capacitor module 1 will be described with reference to Figures 6 and 7. Figure 6 is a cross-sectional view of area AA in Figure 1. Figure 7 is an enlarged view of area R1 in Figure 6.

[0051] To reduce the inductance of the capacitor module 1, for example, it is effective to overlap the first busbar 20 and the second busbar 30 in close proximity. When overlapping the first busbar 20 and the second busbar 30, the effect of inductance reduction can be further improved if the two busbars 20 and 30 are arranged parallel to each other. Generally, since currents flow in opposite directions between the first busbar 20 and the second busbar 30, overlapping the first busbar 20 and the second busbar 30 allows the electric fields generated by the currents flowing through each busbar to cancel each other out. The larger the area of ​​the overlap between the first busbar 20 and the second busbar 30, and the shorter the distance between the busbars, the greater the effect of inductance reduction.

[0052] In this embodiment, as shown in Figures 6 and 7, the inductance of the capacitor module 1 is reduced by overlapping the second extension portion 24 of the first busbar 20 and the fourth extension portion 34 of the second busbar 30. When the first busbar 20 and the second busbar 30 are overlapped, insulating paper 60 is placed between the second extension portion 24 and the fourth extension portion 34 to prevent a short circuit from occurring between the first busbar 20 and the second busbar 30 (see Figure 2A).

[0053] As shown in Figure 7, current flows in the direction of arrow A1 through the second extension 24, and current flows in the direction of arrow A2 through the fourth extension 34. Therefore, currents flow in opposite directions through the second extension 24 and the fourth extension 34. As a result, the electric fields formed by the currents flowing through the second extension 24 and the currents flowing through the fourth extension 34 cancel each other out, thereby reducing the inductance of the capacitor module 1.

[0054] By providing a second extension portion 24 and a fourth extension portion 34 on the first bus bar 20 and the second bus bar 30, respectively, the overlapping portion of the first bus bar 20 and the second bus bar 30 can be accommodated inside the case 40, as shown in Figure 6. For example, in conventional configurations such as those shown in Patent Document 1, the overlapping portion of the two bus bars extends to the outside of the case, resulting in a larger capacitor module size and limitations on the space available for mounting the capacitor module. In this embodiment, a second extension portion 24 and a fourth extension portion 34 are provided to secure the area of ​​the overlapping portion of the first bus bar 20 and the second bus bar 30, and the second extension portion 24 and the fourth extension portion 34 are arranged along the side surface 13 of the capacitor element 10. As a result, the area of ​​the overlapping portion of the first bus bar 20 and the second bus bar 30 can be increased without increasing the overall size of the capacitor module 1, thereby reducing the inductance of the capacitor module 1.

[0055] Furthermore, in this embodiment, in the direction perpendicular to the planes extending of the second extension portion 24 and the fourth extension portion 34 (Z direction), the fourth extension portion 34 of the second busbar 30 is positioned closer to the side surface 13 of the capacitor element 10 than the second extension portion 24 of the first busbar 20. Specifically, when overlapping the second extension portion 24 and the fourth extension portion 34, the fourth extension portion 34 is first positioned along the side surface 13 of the capacitor element 10, and the second extension portion 24 is then overlapped with the fourth extension portion 34 via the insulating paper 60. With this arrangement, as shown in Figure 7, the distance between the fourth extension portion 34 of the second busbar 30 and the third extension portion 32 of the second busbar 30 can be reduced. Current flows in the direction of arrow A2 in the fourth extension portion 34, and current flows in the direction of arrow A3 in the third extension portion 32. Therefore, currents flow in opposite directions through the fourth extension 34 and the third extension 32. As a result, the electric field generated by the current flowing through the fourth extension 34 and the electric field generated by the current flowing through the third extension 32 cancel each other out. Consequently, the inductance of the capacitor module 1 can be further reduced.

[0056] Furthermore, in this embodiment, the second extended portion 24 and the fourth extended portion 34 are sealed in the sealing resin 50. Since the overlapping portion of the first busbar 20 and the second busbar 30 is located inside the sealing resin 50, the inductance of the capacitor module 1 can be reduced without increasing the size of the capacitor module 1.

[0057] As shown in Figures 6 and 7, in this embodiment, the first connection portion 23 and the second connection portion 33 are positioned closer to the first electrode 11 than to the center in the X direction. In other words, the first connection portion 23 and the second connection portion 33 are positioned such that the distance from the first electrode 11 to the second electrode 12 is smaller than the distance from the second electrode 12 in the direction from the first electrode 11 to the second electrode 12 (X direction). By positioning the first connection portion 23 and the second connection portion 33 in this way, the distance that the second extension portion 24 and the fourth extension portion 3 can extend in the X direction can be increased. Therefore, the overlapping area of ​​the second extension portion 24 and the fourth extension portion 34 can be increased, which contributes to reducing the inductance of the capacitor module 1.

[0058] [effect] The above-described embodiment provides the following effects.

[0059] The capacitor module 1 comprises a capacitor element 10, a first busbar 20, and a second busbar 30. The capacitor element 10 has a first electrode 11, a second electrode 12, and a side surface 13 connecting the first electrode 11 and the second electrode 12. The first busbar 20 is electrically connected to the first electrode 11. The second busbar 30 is electrically connected to the second electrode 12. The first busbar 20 has a first contact portion 21, a first extension portion 22, a first connection portion 23, a second extension portion 24, and a first terminal portion 25. The first contact portion 21 contacts the first electrode 11. The first extension portion 22 extends from the first contact portion 21 toward the second electrode 12 in a direction along the side surface 13. The first connection portion 23 extends from the first extension portion 22 toward the side surface 13. The second extension portion 24 extends from the first connection portion 23 toward the second electrode 12 in a direction along the side surface 13. The first terminal portion 25 extends from the second extension portion 24 toward the side surface 13. The second busbar 30 has a second contact portion 31, a third extension portion 32, a second connection portion 33, a fourth extension portion 34, and a second terminal portion 35. The second contact portion 31 contacts the second electrode 12. The third extension portion 32 extends from the second contact portion 31 toward the first electrode 11 in a direction along the side surface 13. The second connection portion 33 extends from the third extension portion 32 toward the side surface 13. The fourth extension portion 34 extends from the second connection portion 33 toward the second electrode 12 in a direction along the side surface 13. The second terminal portion 35 extends from the fourth extension portion 34 toward the side surface 13. When viewed from a direction perpendicular to the plane on which the second extension portion 24 and the fourth extension portion 34 extend, the second extension portion 24 and the fourth extension portion 34 are arranged to overlap in at least a portion.

[0060] This configuration makes it possible to provide a capacitor module 1 that can be miniaturized while reducing inductance. The overlapping portion of the first busbar 20 and the second busbar 30 can be arranged along the side surface 13 of the capacitor element 10. Therefore, the area of ​​the overlapping portion of the first busbar 20 and the second busbar 30 can be increased without increasing the size of the capacitor module 1. Consequently, the inductance of the capacitor module 1 can be reduced, and the increase in impedance can be suppressed, thereby suppressing the temperature rise of the capacitor module 1.

[0061] The first busbar 20 includes a first portion 20a, which includes a first contact portion 21, a first extension portion 22, and a first connection portion 23; and a second portion 20b, which includes a second extension portion 24 and a first terminal portion 25. The second busbar 30 includes a third portion 30a, which includes a second contact portion 31, a third extension portion 32, and a second connection portion 33; and a fourth portion 30b, which includes a fourth extension portion 34 and a second terminal portion 35. The first portion 20a and the second portion 20b are constructed separately and are joined to each other. The third portion 30a and the fourth portion 30b are constructed separately and are joined to each other.

[0062] This configuration allows for easy modification of the overlapping portion between the first busbar 20 and the second busbar 30. This improves the design flexibility of the capacitor module 1.

[0063] The second extension portion 24 has a plate-shaped first main body portion 24a and a first projection portion 24b that protrudes from the first main body portion 24a toward the first connecting portion 23. The first projection portion 24b and the first connecting portion 23 are joined. The fourth extension portion 34 has a plate-shaped second main body portion 34a and a second projection portion 34b that protrudes from the second main body portion 34a toward the second connecting portion 33. The second projection portion 34b and the second connecting portion 33 are joined. The first main body portion 24a and the second main body portion 34a are arranged overlapping. The first projection portion 24b and the second projection portion 34b are arranged alternately when viewed from a direction perpendicular to the plane on which the second extension portion 24 and the fourth extension portion 34 extend.

[0064] With this configuration, the overlapping portion of the first busbar 20 and the second busbar 30 is formed in a comb-like shape, and by arranging the first protrusion 24b and the second protrusion 34b alternately, the creepage distance between the first busbar 20 and the second busbar 30 can be ensured.

[0065] The first main body portion 24a or the second main body portion 34a is provided with a notch 24d.

[0066] This configuration ensures sufficient creepage distance between the first busbar 20 and the second busbar 30, thereby improving the reliability of the capacitor module 1.

[0067] In a direction perpendicular to the planes extending from the second and fourth extensions 24 and 34, the fourth extension 34 is positioned closer to the side surface 13 than the second extension 24.

[0068] This configuration allows for a reduction in the distance between the third extension 32 and the fourth extension 34 in the second busbar 30. Since currents flow in opposite directions between the third extension 32 and the fourth extension 34, reducing the distance between them further reduces the inductance of the capacitor module 1.

[0069] The first connection portion 23 and the second connection portion 33 are arranged such that, in the direction from the first electrode 11 toward the second electrode 12, the distance from the first electrode 11 is smaller than the distance from the second electrode 12.

[0070] This configuration allows for a larger overlapping area between the second extension 24 and the fourth extension 34, thereby further reducing the inductance of the capacitor module 1.

[0071] Furthermore, the device includes a capacitor element 10, a case 40 that houses at least a portion of the first busbar 20 and the second busbar 30, and a sealing resin 50 that fills the case 40 and seals the capacitor element 10. The second extension portion 24 and the fourth extension portion 34 are sealed in the sealing resin 50.

[0072] This configuration makes it possible to reduce the inductance of the capacitor module 1 without increasing its size.

[0073] [Differentiation] In the embodiments described above, an example was described in which the first busbar 20 includes a first portion 20a and a second portion 20b, and the second busbar 30 includes a third portion 30a and a fourth portion 30b, and the first portion 20a and the second portion 20b, and the third portion 30a and the fourth portion 30b are each configured as separate parts, but the invention is not limited to this. The first portion 20a and the second portion 20b may be formed integrally, and the third portion 30a and the fourth portion 30b may be formed integrally.

[0074] Furthermore, although the above-described embodiment described an example in which the second extension portion 24 and the fourth extension portion 34 are each formed in a comb shape, the invention is not limited to this. The second extension portion 24 and the fourth extension portion 34 can be formed in any shape.

[0075] Furthermore, although the above-described embodiment described an example in which the fourth extension portion 34 is positioned closer to the side surface 13 of the capacitor element 10 than the second extension portion 24, the embodiment is not limited to this. The second extension portion 24 may be positioned closer than the fourth extension portion 34.

[0076] Furthermore, in the above-described embodiment, an example was described in which the first connection portion 23 and the second connection portion 33 are arranged such that the distance from the first electrode 11 is smaller than the distance from the second electrode 12 in the direction from the first electrode 11 to the second electrode 12, but the invention is not limited to this. The first connection portion 23 and the second connection portion 33 may be arranged such that the distance from the second electrode 12 is smaller than the distance from the first electrode 11, or they may be arranged in a position where the distances between the first electrode 11 and the second electrode 12 are approximately equal.

[0077] Furthermore, although the above-described embodiment described an example in which the second extended portion 24 and the fourth extended portion 34 are sealed in the sealing resin 50, the invention is not limited to this. The second extended portion 24 and the fourth extended portion 34 do not need to be sealed in the sealing resin 50.

[0078] Furthermore, although the above-described embodiment described an example in which the capacitor module 1 comprises three capacitor elements 10, the embodiment is not limited to this. The capacitor module 1 may include one capacitor element 10, or it may include two or more capacitor elements 10.

[0079] (Summary of the embodiment) (1) The capacitor module of the present disclosure comprises a capacitor element having a first electrode, a second electrode, and a side surface connecting the first electrode and the second electrode, a first busbar electrically connected to the first electrode, and a second busbar electrically connected to the second electrode, wherein the first busbar has a first contact portion that contacts the first electrode, a first extension portion that extends from the first contact portion toward the second electrode in a direction along the side surface, a first connecting portion that extends from the first extension portion toward the side surface, a second extension portion that extends from the first connecting portion toward the second electrode in a direction along the side surface, and a side extending from the second extension portion toward the side The second busbar has a first terminal portion extending away from the surface, and the second busbar has a second contact portion that contacts the second electrode, a third extending portion that extends from the second contact portion toward the first electrode in a direction along the side surface, a second connecting portion that extends from the third extending portion toward the side surface, a fourth extending portion that extends from the second connecting portion toward the second electrode in a direction along the side surface, and a second terminal portion that extends from the fourth extending portion toward the side surface, and when viewed from a direction perpendicular to the surface on which the second and fourth extending portions extend, the second and fourth extending portions are arranged to overlap by at least a portion.

[0080] (2) In the capacitor module of (1), the first busbar includes a first part including a first contact portion, a first extension portion and a first connection portion, and a second part including a second extension portion and a first terminal portion, wherein the first part and the second part are configured separately and the first part and the second part are joined to each other. The second busbar includes a third part including a second contact portion, a third extension portion and a second connection portion, and a fourth part including a fourth extension portion and a second terminal portion, wherein the third part and the fourth part are configured separately and the third part and the fourth part are joined to each other.

[0081] (3) In the capacitor module of (1) or (2), the second extension portion has a first main body portion formed in the shape of a plate and a first projection portion that protrudes from the first main body portion toward the first connection portion, and the first projection portion and the first connection portion are joined together, and the fourth extension portion has a second main body portion formed in the shape of a plate and a second projection portion that protrudes from the second main body portion toward the second connection portion, and the second projection portion and the second connection portion are joined together, and the first main body portion and the second main body portion are arranged to overlap, and the first projection portion and the second projection portion are arranged alternately when viewed from a direction perpendicular to the plane on which the two extension portions and the fourth extension portion extend.

[0082] In the capacitor module of (4)(3), the first main body or the second main body is provided with a notch.

[0083] (5) In the capacitor module of (1) or (2), the first busbar includes a first portion including a first contact portion, a first extension portion and a first connection portion, and a second portion including a second extension portion and a first terminal portion, wherein the first portion and the second portion are integrally formed, and the second busbar includes a third portion including a second contact portion, a third extension portion and a second connection portion, and a fourth portion including a fourth extension portion and a second terminal portion, wherein the third portion and the fourth portion are integrally formed.

[0084] (6) In any one of the capacitor modules from (1) to (5), the fourth extension is positioned closer to the side surface than the second extension in a direction perpendicular to the planes on which the second and fourth extensions extend.

[0085] (7) In any one of the capacitor modules from (1) to (6), the first connection and the second connection are arranged such that the distance from the first electrode is less than the distance from the second electrode in the direction from the first electrode to the second electrode.

[0086] (8) In any one of the capacitor modules of (1) to (7), further comprising a capacitor element, a case housing at least a portion of a first busbar and a second busbar, and a sealing resin filling the case to seal the capacitor element, wherein the second extension and the fourth extension are sealed in the sealing resin. [Industrial applicability]

[0087] This disclosure is useful for capacitor modules used in various electronic devices, electrical equipment, industrial equipment, vehicle equipment, etc. [Explanation of Symbols]

[0088] 1 Capacitor module 10 Capacitor element 11 1st electrode 12 Second electrode 13 Side view 20 First Bus Bar 20a Part 1 20b 2nd part 21 1st contact part 22 1st extension part 23. First connection section 24 Second extension part 24a First main body 24b 1st protrusion 25 1st terminal section 30 Second Bus Bar 30a 3rd part 30b Part 4 31 2nd contact part 32 Third extension part 33 Second connection section 34 4th extension part 34a Second main body 34b Second protrusion 35 2nd terminal section 40 cases 41 Opening 42 Bottom 50 Sealing resin 60 Insulating paper

Claims

1. A capacitor element having a first electrode, a second electrode, and a side surface connecting the first electrode and the second electrode, A first busbar electrically connected to the first electrode, A second busbar electrically connected to the second electrode, Equipped with, The first busbar has a first contact portion that contacts the first electrode, a first extension portion that extends from the first contact portion toward the second electrode in a direction along the side surface, a first connecting portion that extends from the first extension portion toward the side surface, a second extension portion that extends from the first connecting portion toward the second electrode in a direction along the side surface, and a first terminal portion that extends from the second extension portion toward the side surface. The second busbar has a second contact portion that contacts the second electrode, a third extension portion that extends from the second contact portion toward the first electrode in a direction along the side surface, a second connecting portion that extends from the third extension portion toward the side surface, a fourth extension portion that extends from the second connecting portion toward the second electrode in a direction along the side surface, and a second terminal portion that extends from the fourth extension portion toward the side surface. When viewed from a direction perpendicular to the plane on which the second and fourth extended portions extend, the second and fourth extended portions are arranged so that at least a portion of them overlap. Capacitor module.

2. The first busbar includes a first portion including a first contact portion, a first extension portion, and a first connecting portion, and a second portion including a second extension portion and a first terminal portion. The first part and the second part are constructed as separate entities, and the first part and the second part are joined together. The second busbar includes a third portion comprising the second contact portion, the third extension portion, and the second connecting portion, and a fourth portion comprising the fourth extension portion and the second terminal portion. The third and fourth parts are constructed as separate entities, and the third and fourth parts are joined together. The capacitor module according to claim 1.

3. The second extending portion has a first main body portion formed in a plate shape and a first protruding portion that protrudes from the first main body portion toward the first connecting portion. The first protruding portion and the first connecting portion are joined together. The fourth extending portion has a second main body portion formed in a plate shape and a second protruding portion that protrudes from the second main body portion toward the second connecting portion. The second protruding portion and the second connecting portion are joined together. The first main body and the second main body are arranged to overlap, The first protrusion and the second protrusion are arranged alternately when viewed from a direction perpendicular to the plane on which the second extension and the fourth extension extend. The capacitor module according to claim 1.

4. The first main body or the second main body is provided with a notch. The capacitor module according to claim 3.

5. The first busbar includes a first portion including a first contact portion, a first extension portion, and a first connecting portion, and a second portion including a second extension portion and a first terminal portion. The first part and the second part are formed integrally, The second busbar includes a third portion comprising the second contact portion, the third extension portion, and the second connecting portion, and a fourth portion comprising the fourth extension portion and the second terminal portion. The third part and the fourth part are formed integrally. The capacitor module according to claim 1.

6. In a direction perpendicular to the planes on which the second and fourth extending portions extend, the fourth extending portion is positioned closer to the side surface than the second extending portion. The capacitor module according to claim 1.

7. The first and second connecting portions are arranged such that, in the direction from the first electrode toward the second electrode, the distance from the first electrode is less than the distance from the second electrode. The capacitor module according to claim 1.

8. moreover, The capacitor element and a case that houses at least a portion of the first busbar and the second busbar, A sealing resin that is filled into the case and seals the capacitor element, Equipped with, The second extended portion and the fourth extended portion are sealed in the sealing resin. The capacitor module according to claim 1.

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