Component for power conversion device

Abstract

To provide a component for a power conversion device capable of improving a heat dissipation property.SOLUTION: A component 1 for a power conversion device comprises: a plurality of capacitors 2; a metal case 3 which has a plurality of accommodating portions 30 for individually accommodating the plurality of capacitors 2; and an adhesive resin portion 4 filled in the plurality of accommodating portions 30 to bond the plurality of capacitors 2 to the metal case 3. Each of the plurality of capacitors 2 includes: a capacitor element 20 having a first electrode 201 and a second electrode 202; a first busbar 51 connected to the first electrode 201; and a second busbar 52 connected to the second electrode 202. Each of the plurality of accommodating portions 30 has an opening 31, and is surrounded by an inner bottom surface 32 facing the opening 31 and an inner peripheral surface 33 connecting the opening 31 and the inner bottom surface 32. Each of the plurality of capacitors 2 faces the inner peripheral surface 33 via the adhesive resin portion 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure generally relates to components for a power conversion device, and more particularly to components for a power conversion device including a plurality of capacitors.

Background Art

[0002] Patent Document 1 discloses a power conversion device. This power conversion device includes a case body with an open upper portion, a capacitor cell housed in a part of the case body, and a potting material for sealing the capacitor cell.

[0003] The above case body includes a cell accommodation space that houses the capacitor cell so as to surround the capacitor cell from a lower surface and side surfaces and is filled with the potting material, and a connection space that is connected to the cell accommodation space and has a bottom surface at a position higher than the bottom surface of the cell accommodation space.

[0004] The integrated space composed of the cell accommodation space and the connection space is surrounded entirely by a space side surface extending to a position higher than the upper end of the capacitor cell.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the power conversion device of Patent Document 1, there are portions where a plurality of capacitor cells are in contact via a potting material, and it is considered that heat generated at such portions hardly escapes to the case body. Therefore, there is still room for improvement in the heat dissipation performance of the power conversion device of Patent Document 1.

[0007] An object of the present disclosure is to provide a component for a power conversion device capable of improving heat dissipation performance.

Means for Solving the Problems

[0008] A component for a power conversion device according to an aspect of the present disclosure includes a plurality of capacitors, a metal case having a plurality of accommodating portions for individually accommodating the plurality of capacitors, and an adhesive resin portion filled in the plurality of accommodating portions for adhering the plurality of capacitors and the metal case. Each of the plurality of capacitors includes a capacitor element having a first electrode and a second electrode, a first bus bar connected to the first electrode, and a second bus bar connected to the second electrode. Each of the plurality of accommodating portions has an opening and is surrounded by an inner bottom surface facing the opening and an inner peripheral surface connecting the opening and the inner bottom surface. Each of the plurality of capacitors faces the inner peripheral surface via the adhesive resin portion.

Effects of the Invention

[0009] According to the present disclosure, heat dissipation performance can be improved.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0011] 1. Overview In the power conversion device of Patent Document 1, four capacitor cells are accommodated in one cell accommodation space, and further, a potting material is filled. When viewed from above, the four capacitor cells are arranged in two rows and two columns. The potting material partitions the four capacitor cells. Specifically, the potting material forms a cross shape when viewed from above and partitions the four capacitor cells. Here, when the four capacitor cells generate heat, for example, it is considered that the heat near the center of the cross-shaped potting material described above is difficult to escape.

[0012] Therefore, based on the above points, the present inventor has conducted intensive research and has developed a component 1 for a power conversion device as follows. That is, in the present embodiment, only one capacitor 2 is accommodated in one accommodation portion 30. That is, a metal case 3 exists around each capacitor 2 via an adhesive resin portion 4. In this way, since each capacitor 2 is in contact with the metal case 3 via the adhesive resin portion 4, the heat generated in the capacitor 2 can be released to the metal case 3 through the adhesive resin portion 4.

[0013] Therefore, according to the present embodiment, the heat dissipation performance can be improved.

[0014] 2. Details (1) First Embodiment <Component for Power Conversion Device> Hereinafter, the component 1 for a power conversion device according to the first embodiment will be described with reference to FIGS. 1 to 7B. Note that the drawings are schematic diagrams, and the respective ratios of the sizes and thicknesses of the respective components in the drawings do not necessarily reflect the actual dimensional ratios.

[0015] The arrows indicating the directions in the drawings (arrows indicating the vertical direction, the horizontal direction, and the front-back direction) are not intended to define the direction during the use of the component 1 for a power conversion device, but are merely shown for easier understanding of the description and do not have an associated entity. The direction in which the metal case 3 opens will be referred to as the "vertical direction", the direction in which the plurality of capacitors 2 are arranged will be referred to as the "horizontal direction", and the direction orthogonal to the vertical direction and the horizontal direction will be referred to as the "front-back direction" in some cases. Looking along the vertical direction is referred to as "plan view", and looking along the horizontal direction is referred to as "side view". The same applies to the second embodiment described later.

[0016] The component 1 for a power conversion device according to the first embodiment is a component used in the power conversion device 10 (see FIG. 8). Note that the power conversion device 10 will be described later.

[0017] As shown in FIGS. 1 to 4, the component 1 for a power conversion device according to the first embodiment includes a plurality (five in the first embodiment) of capacitors 2, a metal case 3, and an adhesive resin portion 4. Hereinafter, each component will be described in order.

[0018] ≪Capacitor≫ As shown in FIG. 6, the capacitor 2 includes a capacitor element 20, a first bus bar 51, a second bus bar 52, a bus bar holder 53, and an exterior body 6.

[0019] 〔Capacitor Element〕 The capacitor element 20 is not particularly limited, and examples thereof include a wound capacitor element and a multilayer capacitor element.

[0020] Specifically, as shown in FIGS. 5A to 5D, the capacitor element 20 has an element body 21, a first electrode 201, and a second electrode 202.

[0021] The shape of the element body 21 is not particularly limited, and examples thereof include a cylindrical shape, an elliptical columnar shape, and a rectangular parallelepiped shape. In the first embodiment, the element body 21 has a rectangular shape extending in the front-rear direction in a plan view (see FIG. 5D), and has a rounded rectangular shape in a side view (see FIGS. 5B and 5C).

[0022] The element body 21 has a first surface 211 (left side surface), a second surface 212 (right side surface), and an outer peripheral surface 213. The first surface 211 is a surface perpendicular to the left-right direction. The second surface 212 is a surface on the opposite side of the first surface 211 and is a surface parallel to the first surface 211. The outer peripheral surface 213 is a surface connecting the outer peripheral edge of the first surface 211 and the outer peripheral edge of the second surface 212.

[0023] The element body 21 includes a dielectric film, a first internal electrode, and a second internal electrode. Inside the element body 21, the first internal electrode and the second internal electrode face each other with the dielectric film interposed therebetween. The first internal electrode and the second internal electrode are deposited on the dielectric film. Thus, the capacitor 2 is a film capacitor. Note that the illustration of the first internal electrode and the second internal electrode is omitted.

[0024] In the first embodiment, the dielectric film also forms the outer peripheral surface 213 of the element body 21. The material of the dielectric film is not particularly limited, and examples thereof include polypropylene (PP) and polyethylene terephthalate (PET).

[0025] A part of the first internal electrode is exposed on the first surface 211 and is not exposed on the second surface 212. A part of the second internal electrode is exposed on the second surface 212 and is not exposed on the first surface 211. The material of the first internal electrode and the second internal electrode is not particularly limited, and examples thereof include aluminum (Al), magnesium (Mg), and alloys thereof.

[0026] The first electrode 201 is formed by spraying metal on the first surface 211. As a result, the first electrode 201 is electrically connected to the first internal electrode. The metal to be sprayed is not particularly limited, and examples thereof include zinc (Zn), tin (Sn), and alloys thereof.

[0027] Similarly to the first electrode 201, the second electrode 202 is formed by spraying metal on the second surface 212. As a result, the second electrode 202 is electrically connected to the second internal electrode.

[0028] 〔First bus bar〕 The first bus bar 51 is a conductive member. The material of the first bus bar 51 is not particularly limited, and examples thereof include copper (Cu), aluminum (Al), and alloys thereof.

[0029] The first bus bar 51 is connected to the first electrode 201. Specifically, the first bus bar 51 is electrically and physically connected to the first electrode 201, for example, by soldering, and extends upward. Note that the first bus bar 51 is not connected to the second electrode 202.

[0030] 〔Second bus bar〕 The second bus bar 52 is also a conductive member. The material of the second bus bar 52 is the same as that of the first bus bar 51.

[0031] The second bus bar 52 is connected to the second electrode 202. Specifically, the second bus bar 52 is located behind the first bus bar 51, and is electrically and physically connected to the second electrode 202, for example, by soldering, and extends upward. Note that the second bus bar 52 is not connected to the first electrode 201.

[0032] 〔Bus bar holder〕 The bus bar holder 53 holds the first bus bar 51 and the second bus bar 52. Specifically, the first bus bar 51 and the second bus bar 52 penetrate the bus bar holder 53 in the vertical direction and are fixed to the bus bar holder 53.

[0033] The bus bar holder 53 is disposed on the upper surface (a part of the outer peripheral surface 213) of the capacitor element 20. Element-side fitting portions 54 exist on both the left and right sides of the bus bar holder 53 (see FIGS. 5B to 5D and FIG. 6).

[0034] The overall width (in the left-right direction) of the bus bar holder 53 is slightly wider than the overall width (in the left-right direction) of the capacitor element 20. The overall length (in the front-rear direction) of the bus bar holder 53 is slightly longer than the overall length (in the front-rear direction) of the capacitor element 20.

[0035] The bus bar holder 53 has electrical insulation properties. The material of the bus bar holder 53 is not particularly limited, and examples thereof include polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and epoxy resin (EP).

[0036] 〔Outer casing〕 As shown in FIGS. 7A and 7B, the outer casing 6 seals the capacitor element 20. Thereby, moisture absorption of the capacitor element 20 can be suppressed.

[0037] In the first embodiment, the outer casing 6 includes a sealing resin portion 61 and an outer case 62.

[0038] The sealing resin portion 61 directly seals the capacitor element 20. Thus, moisture absorption of the capacitor element 20 can be suppressed by the sealing resin portion 61.

[0039] The sealing resin portion 61 is a cured product of a sealing resin. That is, the sealing resin is an electrically insulating resin for forming the sealing resin portion 61. The sealing resin is not particularly limited, and examples thereof include epoxy resin (EP).

[0040] The outer case 62 houses the capacitor element 20 and the sealing resin portion 61. Thereby, moisture absorption of the capacitor element 20 can be further suppressed by the sealing resin portion 61 and the outer case 62.

[0041] The exterior case 62 is open at the top. Inside the exterior case 62, the capacitor element 20 is buried in the encapsulating resin portion 61. A part of the first bus bar 51 (substantially the upper half) and a part of the second bus bar 52 (substantially the upper half) are not encapsulated and are exposed to the outside. Thus, a part of the first bus bar 51 and a part of the second bus bar 52 are led out from the exterior body 6 to the outside. Therefore, the capacitor 2 can be electrically connected to an external device by the first bus bar 51 and the second bus bar 52.

[0042] As shown in FIG. 7A, the distance between the inner surfaces facing each other in the left - right direction inside the exterior case 62 is slightly longer than the total width (left - right direction) of the capacitor element 20. Thereby, a space can be secured for filling the encapsulating resin portion 61 on both the left and right sides of the capacitor element 20.

[0043] As shown in FIG. 7B, the distance between the inner surfaces facing each other in the front - rear direction inside the exterior case 62 is slightly longer than the total length (front - rear direction) of the capacitor element 20. Thereby, a space can be secured for filling the encapsulating resin portion 61 on both the front and rear sides of the capacitor element 20.

[0044] The depth (vertical direction) of the exterior case 62 is slightly deeper than the thickness (vertical direction) of the capacitor element 20. Thereby, a space can be secured for filling the encapsulating resin portion 61 on both the upper and lower sides of the capacitor element 20.

[0045] The distance between the inner surfaces facing each other in the left - right direction inside the exterior case 62 is substantially equal to the total width (left - right direction) of the bus bar holder 53. By the left end of the bus bar holder 53 abutting against the left inner surface of the exterior case 62 and the right end of the bus bar holder 53 abutting against the right inner surface of the exterior case 62, it becomes easier to align the capacitor element 20 in the left - right direction.

[0046] As shown in FIG. 7B, the distance between the inner surfaces facing each other in the front-rear direction within the exterior case 62 is substantially equal to the overall length (in the front-rear direction) of the bus bar holder 53. By having the front end of the bus bar holder 53 abut against the front inner surface of the exterior case 62 and the rear end of the bus bar holder 53 abut against the rear inner surface of the exterior case 62, it becomes easier to align the capacitor element 20 in the front-rear direction.

[0047] As shown in FIG. 6, case-side receiving portions 63 are present on the inner surfaces on both the left and right sides of the exterior case 62. By fitting the element-side fitting portion 54 of the bus bar holder 53 into the case-side receiving portion 63 of the exterior case 62, the capacitor element 20 can be slightly lifted from the inner bottom surface of the exterior case 62 (see FIGS. 7A and 7B). Thereby, a space can be secured for filling the sealing resin portion 61 below the capacitor element 20.

[0048] The material of the exterior case 62 is not particularly limited, and examples thereof include polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), epoxy resin (EP), and the like.

[0049] ≪Metal Case≫ The metal case 3 is open upward. As shown in FIG. 4, the metal case 3 has a plurality (five in the first embodiment) of accommodating portions 30 and a preliminary accommodating portion 37.

[0050] The metal case 3 is made of die-cast, preferably aluminum die-cast. The metal case 3 conducts heat more easily than the adhesive resin portion 4 and the exterior body 6 (sealing resin portion 61 and exterior case 62).

[0051] 〔Accommodating Portion〕 The plurality of accommodating portions 30 are located rearward of the preliminary accommodating portion 37. The plurality of accommodating portions 30 occupy substantially the rear half of the metal case 3.

[0052] The plurality of accommodating portions 30 are arranged side by side in the left-right direction. The plurality of accommodating portions 30 are arranged adjacent to each other via partition walls 34. The partition walls 34 are part of the metal case 3.

[0053] The plurality of accommodating portions 30 individually accommodate the plurality of capacitors 2. That is, the plurality of accommodating portions 30 and the plurality of capacitors 2 correspond to each other one by one. That is, one capacitor 2 is accommodated in one accommodating portion 30.

[0054] The accommodating portion 30 is open upward. The accommodating portion 30 has an opening 31. The opening 31 is located at the boundary between the accommodating portion 30 and the outside. The opening 31 forms a rounded rectangular shape extending in the front-rear direction in plan view.

[0055] In plan view, the entire width (left-right direction) of the opening 31 is slightly wider than the entire width (left-right direction) of the capacitor 2. Thereby, as shown in FIG. 2, a space can be secured for filling the adhesive resin portions 4 on both the left and right sides of the capacitor 2.

[0056] In plan view, the entire length (front-rear direction) of the opening 31 is slightly longer than the entire length (front-rear direction) of the capacitor 2. Thereby, as shown in FIG. 3, a space can be secured for filling the adhesive resin portions 4 on both the front and rear sides of the capacitor 2.

[0057] The accommodating portion 30 is a space surrounded by an inner bottom surface 32 and an inner peripheral surface 33. The inner bottom surface 32 faces upward and faces the opening 31. The inner peripheral surface 33 connects the opening 31 and the inner bottom surface 32. The depth of the accommodating portion 30 (the distance between the opening 31 and the inner bottom surface 32 in the up-down direction) is slightly shallower than the height of the capacitor 2 (in the up-down direction) (see FIGS. 2 and 3). Therefore, when the lower surface of the capacitor 2 (the lower surface of the exterior body 6 (exterior case 62) in the first embodiment) is in contact with the inner bottom surface 32, the upper surface of the capacitor 2 will be located at a position slightly higher than the accommodating portion 30.

[0058] As shown in FIGS. 2 and 3, the capacitor 2 faces the inner peripheral surface 33 via the adhesive resin portion 4. In the first embodiment, the capacitor 2 is in direct contact with the inner bottom surface 32, but the capacitor 2 may face the inner bottom surface 32 via the adhesive resin portion 4.

[0059] As shown in FIG. 2, one first electrode 201 and the other second electrode 202 of two adjacent capacitors 2 among the plurality of capacitors 2 face each other with a partition wall 34 therebetween. A plurality of capacitors 2 adjacent to each other in the left - right direction are electrically connected (for example, in series connection). When these capacitors 2 are energized, the first electrode 201 and the second electrode 202 have different polarities. Thus, during energization, the first electrode 201 and the second electrode 202 with different polarities face each other with the partition wall 34 therebetween.

[0060] 〔Reserve accommodation part〕 The reserve accommodation part 37 accommodates members other than the capacitor 2 as required. The members other than the capacitor 2 are not particularly limited, and examples include semiconductor modules and the like.

[0061] The reserve accommodation part 37 is located in front of the plurality of accommodation parts 30. The reserve accommodation part 37 occupies substantially the front half of the metal case 3.

[0062] ≪Adhesive resin part≫ The adhesive resin part 4 is filled in the plurality of accommodation parts 30. That is, the adhesive resin part 4 fills the gap between the inner surface of the accommodation part 30 and the outer surface of the capacitor 2. In the first embodiment, the adhesive resin part 4 fills the gap between the inner bottom surface 32 and the inner peripheral surface 33 of the accommodation part 30 and the outer bottom surface and the outer peripheral surface of the exterior body 6 (exterior case 62) of the capacitor 2. Thus, the adhesive resin part 4 adheres the plurality of capacitors 2 and the metal case 3.

[0063] The adhesive resin part 4 is a cured product of the adhesive resin 40. That is, the adhesive resin 40 is an electrically insulating resin for forming the adhesive resin part 4. Examples of the adhesive resin 40 are the same as those of the sealing resin.

[0064] Next, the resin 40 may be a TIM (Thermal Interface Material). A TIM is a heat dissipation material, particularly a material for reducing contact thermal resistance. The TIM is not particularly limited, and examples thereof include thermal grease, a heat conduction sheet, a PCM (Phase Change Material), a gel, a high thermal conductivity adhesive, a thermal tape, and the like.

[0065] <Mounting in the Metal Case of the Capacitor> Next, the mounting of the capacitor 2 in the metal case 3 will be described with reference to FIG. 4.

[0066] First, the adhesive resin 40 is applied to the inner bottom surface 32 of the housing portion 30 of the metal case 3. In FIG. 4, the adhesive resin 40 is indicated by dot hatching.

[0067] Next, the capacitor 2 is mounted in the housing portion 30. That is, when the capacitor 2 is submerged in the housing portion 30, the adhesive resin 40 is pushed back by the bottom surface of the capacitor 2, and the adhesive resin 40 rises and presses between the outer peripheral surface of the capacitor 2 and the inner peripheral surface 33 of the housing portion 30. Then, when the adhesive resin 40 is cured, as shown in FIGS. 2 and 3, the adhesive resin portion 4 is formed.

[0068] <Power Conversion Device> Next, the power conversion device 10 (inverter) according to the first embodiment will be described with reference to FIG. 8.

[0069] The power conversion device 10 includes a power conversion device component 1, a converter circuit 71, and an inverter circuit 72. Although not shown in FIGS. 1 to 3, in the power conversion device component 1, one first bus bar 51 and the other second bus bar 52 of two adjacent capacitors 2 are electrically connected (for example, serially connected) by appropriate means.

[0070] The converter circuit 71 is a circuit that converts alternating current into direct current and is electrically connected to a plurality of capacitors 2 of the power conversion device component 1.

[0071] The inverter circuit 72 is a circuit that changes the voltage and / or frequency of alternating current when converting direct current to alternating current, and is electrically connected to a plurality of capacitors 2 of the component 1 for a power conversion device.

[0072] The power conversion device 10 is used, for example, as follows. That is, the converter circuit 71 of the power conversion device 10 is connected to the power supply 73, and the inverter circuit 72 of the power conversion device 10 is connected to the motor 74. Note that the power supply 73 and the motor 74 are included in external devices.

[0073] First, the alternating current from the power supply 73 is converted to direct current by the converter circuit 71 of the power conversion device 10, and the plurality of capacitors 2 of the component 1 for a power conversion device adjust the converted direct current to a stable direct current while repeatedly charging and discharging. Next, this direct current is changed to alternating current at an arbitrary voltage and frequency by the inverter circuit 72 of the power conversion device 10 and output.

[0074] <Operational effects> When the component 1 for a power conversion device according to the first embodiment is incorporated into the power conversion device 10 and used, the plurality of capacitors 2 repeatedly charge and discharge. As a result, each of the plurality of capacitors 2 can generate heat.

[0075] Here, in the first embodiment, there is no place where only the adhesive resin part 4 is interposed between two adjacent capacitors 2, nor is there a place where only the adhesive resin part 4 and the exterior body 6 are interposed. That is, in the first embodiment, each of the plurality of capacitors 2 faces the inner peripheral surface 33 via the adhesive resin part 4 as shown in FIG. 2. In this way, since each individual capacitor 2 is in contact with the metal case 3 via the adhesive resin part 4, the heat generated in the capacitor 2 can be released to the metal case 3 through the adhesive resin part 4.

[0076] Therefore, according to the component 1 for a power conversion device according to the first embodiment, the heat dissipation performance can be improved.

[0077] Furthermore, in the first embodiment, as shown in FIG. 2, one first electrode 201 and the other second electrode 202 of two adjacent capacitors 2 among the plurality of capacitors 2 face each other with a partition wall 34 interposed therebetween. Therefore, since the first electrode 201 and the second electrode 202 have different polarities during energization, the ESL (Equivalent Series Inductance) can be reduced.

[0078] (2) Second Embodiment Next, the component 1 for a power conversion device according to the second embodiment will be described with reference to FIG. 9. In the second embodiment, the same components as those in the first embodiment may be denoted by the same reference numerals as in the first embodiment, and detailed descriptions thereof may be omitted.

[0079] In the second embodiment, the housing portion 30 of the metal case 3 is different from that in the first embodiment. That is, in the first embodiment, the area S31 of the opening 31 and the area S32 of the inner bottom surface 32 are the same, but in the second embodiment, the area S31 of the opening 31 is larger than the area S32 of the inner bottom surface 32. In other words, in the second embodiment, in a plan view, the periphery of the opening 31 exists outside the periphery of the inner bottom surface 32.

[0080] Specifically, in the second embodiment, a step is provided in the middle of the inner peripheral surface 33 of the housing portion 30, and due to this step, the housing portion 30 is divided into an opening-side space 35 and an inner-bottom-surface-side space 36. The inner peripheral length of the inner peripheral surface 33 of the opening-side space 35 is longer than the inner peripheral length of the inner peripheral surface 33 of the inner-bottom-surface-side space 36. That is, the volume of the opening-side space 35 is larger than the volume of the inner-bottom-surface-side space 36.

[0081] As described above, in the second embodiment, a step is provided in the middle of the inner peripheral surface 33 of the housing portion 30, but the inner peripheral length of the inner peripheral surface 33 may be continuously increased as going from the inner bottom surface 32 toward the opening 31.

[0082] <Operational Effects> As shown in Fig. 4, when a plurality of capacitors 2 are individually housed in a plurality of housing portions 30, it is often the case that a certain amount of adhesive resin 40 is previously applied to the inner bottom surface 32 of the plurality of housing portions 30. However, when manufacturing a plurality of capacitors 2, within the manufacturing tolerance, the dimensions of the plurality of capacitors 2 may vary. Therefore, due to the variation in the dimensions of the capacitor 2, the extent to which the adhesive resin 40 bulges upward between the outer peripheral surface of the capacitor 2 and the inner peripheral surface 33 of the housing portion 30 will differ.

[0083] That is, if a capacitor 2 with the minimum dimension within the tolerance is housed in the housing portion 30, the possibility of the adhesive resin 40 overflowing from the opening 31 of the housing portion 30 is low. However, if a capacitor 2 with the maximum dimension within the tolerance is housed in the housing portion 30, the possibility of the adhesive resin 40 overflowing from the opening 31 of the housing portion 30 becomes high.

[0084] Therefore, in the second embodiment, as shown in Fig. 9, the area S31 of the opening 31 is made larger than the area S32 of the inner bottom surface 32. Thereby, the gap between the outer peripheral surface of the capacitor 2 and the inner peripheral surface 33 of the housing portion 30 can be made larger on the opening 31 side than on the inner bottom surface 32 side.

[0085] Therefore, when the capacitor 2 is housed in the housing portion 30, it is possible to suppress the adhesive resin 40 from overflowing from the housing portion 30.

[0086] On the other hand, since the gap between the outer peripheral surface of the capacitor 2 and the inner peripheral surface 33 of the housing portion 30 is smaller on the inner bottom surface 32 side than on the opening 31 side, good thermal conductivity can be ensured.

[0087] 3. Modification In the first and second embodiments, the capacitor 2 is a film capacitor, but it may also be a ceramic capacitor, an electrolytic capacitor, or the like.

[0088] In the first and second embodiments, five capacitors 2 are individually housed in five housing portions 30, but the number of capacitors 2 is not particularly limited as long as it is plural.

[0089] In the first and second embodiments, the number of capacitors 2 is the same as the number of accommodating portions 30, but the number of accommodating portions 30 may be larger than the number of capacitors 2. That is, there may be empty space in the accommodating portion 30.

[0090] In the first and second embodiments, the capacitor 2 includes the exterior body 6, but the capacitor 2 may not include the exterior body 6. That is, the capacitor 2 may not include either the encapsulating resin portion 61 or the exterior case 62.

[0091] In the first and second embodiments, the exterior body 6 includes the encapsulating resin portion 61 and the exterior case 62, but the exterior body 6 may not include the exterior case 62. That is, the exterior body 6 may be composed of only the encapsulating resin portion 61.

[0092] In the first and second embodiments, the capacitor 2 includes the bus bar holder 53, but the capacitor 2 may not include the bus bar holder 53.

[0093] In the first and second embodiments, the metal case 3 has the preliminary accommodating portion 37, but the metal case 3 may not have the preliminary accommodating portion 37.

[0094] 4. Aspect As is clear from the above embodiments and modification examples, the present disclosure includes the following aspects. Hereinafter, signs are attached in parentheses only for the purpose of clarifying the correspondence with the embodiments.

[0095] The first aspect is a component (1) for a power conversion device, comprising: a plurality of capacitors (2); a metal case (3) having a plurality of accommodating portions (30) for individually accommodating the plurality of capacitors (2); and an adhesive resin portion (4) filled in the plurality of accommodating portions (30) for adhering the plurality of capacitors (2) and the metal case (3). Each of the plurality of capacitors (2) includes a capacitor element (20) having a first electrode (201) and a second electrode (202), a first bus bar (51) connected to the first electrode (201), and a second bus bar (52) connected to the second electrode (202). Each of the plurality of accommodating portions (30) has an opening (31), and is surrounded by an inner bottom surface (32) facing the opening (31) and an inner peripheral surface (33) connecting the opening (31) and the inner bottom surface (32). Each of the plurality of capacitors (2) faces the inner peripheral surface (33) via the adhesive resin portion (4).

[0096] According to this aspect, since each individual capacitor (2) is in contact with the metal case (3) via the adhesive resin portion (4), the heat generated in the capacitor (2) can be dissipated to the metal case (3) through the adhesive resin portion (4), so that the heat dissipation performance can be improved.

[0097] The second aspect is a component (1) for a power conversion device based on the first aspect. In the second aspect, each of the plurality of capacitors (2) further includes an exterior body (6) for sealing the capacitor element (20). A part of the first bus bar (51) and a part of the second bus bar (52) are led out from the exterior body (6) to the outside.

[0098] According to this aspect, the moisture absorption of the capacitor element (20) can be suppressed by the exterior body (6). The capacitor (2) can be electrically connected to an external device by the first bus bar (51) and the second bus bar (52) led out to the outside.

[0099] The third aspect is a component (1) for a power conversion device based on the second aspect. In the third aspect, the exterior body (6) includes a sealing resin portion (61) that directly seals the capacitor element (20).

[0100] According to this aspect, the moisture absorption of the capacitor element (20) can be suppressed by the sealing resin portion (61).

[0101] The fourth aspect is a component (1) for a power conversion device based on the third aspect. In the fourth aspect, the exterior body (6) further includes an exterior case (62) that houses the capacitor element (20) and the sealing resin portion (61).

[0102] According to this aspect, the moisture absorption of the capacitor element (20) can be further suppressed by the sealing resin portion (61) and the exterior case (62).

[0103] The fifth aspect is a component (1) for a power conversion device based on any one of the first to fourth aspects. In the fifth aspect, the plurality of accommodating portions (30) are arranged adjacent to each other via a partition wall (34) that is a part of the metal case (3). One first electrode (201) and the other second electrode (202) of two adjacent capacitors (2) among the plurality of capacitors (2) face each other via the partition wall (34).

[0104] According to this aspect, by the first electrode (201) and the second electrode (202) facing each other via the partition wall (34), the ESL (Equivalent Series Inductance) can be reduced.

[0105] The sixth aspect is a component (1) for a power conversion device based on any one of the first to fifth aspects. In the sixth aspect, the area (S31) of the opening (31) is larger than the area (S32) of the inner bottom surface (32).

[0106] According to this aspect, when the capacitor (2) is housed in the housing portion (30), it is possible to suppress the adhesive resin (40) for forming the adhesive resin portion (4) from overflowing from the housing portion (30).

Explanation of Signs

[0107] 1 Parts for power conversion device 2 Capacitor 20 Capacitor element 201 First electrode 202 Second electrode 3 Metal case 30 Housing portion 31 Opening 32 Inner bottom surface 33 Inner peripheral surface 34 Partition wall 4 Adhesive resin portion 51 First bus bar 52 Second bus bar 6 Exterior body 61 Sealing resin portion 62 Exterior case

Claims

1. A metal case having a plurality of capacitors and a plurality of accommodating portions for individually accommodating the plurality of capacitors, and an adhesive resin portion filled in the plurality of accommodating portions for adhering the plurality of capacitors and the metal case, Each of the plurality of capacitors includes a capacitor element having a first electrode and a second electrode, a first bus bar connected to the first electrode, and a second bus bar connected to the second electrode, Each of the plurality of accommodating portions has an opening and is surrounded by an inner bottom surface facing the opening and an inner peripheral surface connecting the opening and the inner bottom surface, Each of the plurality of capacitors faces the inner peripheral surface via the adhesive resin portion, A component for a power conversion device.

2. Each of the plurality of capacitors further includes an exterior body for sealing the capacitor element, A part of the first bus bar and a part of the second bus bar are led out to the outside from the exterior body, The component for a power conversion device according to Claim 1.

3. The exterior body includes a sealing resin portion for directly sealing the capacitor element, The component for a power conversion device according to Claim 2.

4. The exterior body further includes an exterior case for accommodating the capacitor element and the sealing resin portion, The component for a power conversion device according to Claim 3.

5. The plurality of accommodating portions are arranged adjacent to each other via a partition wall that is a part of the metal case, A first electrode of one of two adjacent capacitors among the plurality of capacitors and a second electrode of the other capacitor face each other via the partition wall, The component for a power conversion device according to Claim 1.

6. The area of the opening is larger than the area of the inner bottom surface, The component for a power conversion device according to Claim 1.

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