Capacitor module and power conversion device

Abstract

The utility model provides a capacitor module and a power conversion device. The capacitor module is provided with one or more capacitor elements covered by a laminated film, and a support body having a frame part for fixing the laminated film, and the laminated film has a covering part for covering the surface of the capacitor element and a flange part extending from the outer edge of the covering part. The end face of the support frame portion fixes the flange portion of the laminated film, thereby holding the capacitor element.

Description

Technical Field

[0001] The utility model relates to a capacitor module and a power conversion device. Background Art

[0002] Capacitors using laminate films as exterior materials are known. For example, a surface mount capacitor described in Patent Document 1 has a capacitor element exteriorly exteriorized by a laminate film.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 4354240 Utility Model Content

[0006] Problems to be solved by utility models

[0007] The surface mount capacitor described in Patent Document 1 has room for improvement in terms of durability.

[0008] According to the utility model, a capacitor module and a power conversion device having improved durability are provided.

[0009] Technical solutions to solve problems

[0010] One embodiment of the utility model relates to a capacitor module comprising: one or more capacitor elements, which are covered by a laminate film; and a support body, which has a frame portion for fixing the laminate film, the laminate film having a covering portion covering the surface of the capacitor element and a flange portion extending from the outer edge of the covering portion, the support body is fixed to the flange portion of the laminate film by the end face of the frame portion, thereby holding the capacitor element, the support body includes a first support body and a second support body, and the flange portion is clamped by the frame portion of the first support body and the frame portion of the second support body for fixing, and a fixing portion for fixing the first support body and the second support body is provided on the outer side surface of the frame portion of the first support body and the outer side surface of the frame portion of the second support body.

[0011] One embodiment of the utility model involves an electric power conversion device comprising: a power semiconductor module; a capacitor element electrically connected to the power semiconductor module and covered by a laminate film; and a shell having a first housing portion for accommodating the power semiconductor module and a second housing portion for accommodating the capacitor element, the laminate film having a covering portion covering the surface of the capacitor element and a flange portion extending outward from the outer edge of the covering portion, the second housing portion of the shell being surrounded by a frame portion for fixing the laminate film, and the shell fixing the flange portion of the laminate film with the end face of the frame portion, thereby holding the capacitor element.

[0012] Utility Model Effect

[0013] According to the present invention, it is possible to provide a capacitor module and a power conversion device having improved durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing the capacitor module 1 according to the first embodiment of the present invention.

[0015] Figure 2 yes Figure 1 An exploded perspective view of the capacitor module 1 is shown in FIG.

[0016] Figure 3A yes Figure 1 AA cross-sectional view of the capacitor module 1.

[0017] Figure 3B yes Figure 1 BB cross-sectional view of the capacitor module 1.

[0018] Figure 3C Yes Figure 3A FIG. 1 is an enlarged view of region R1.

[0019] Figure 4A This is a cross-sectional view showing a capacitor module 1A according to Modification 1 of Embodiment 1.

[0020] Figure 4B Yes Figure 4A FIG. 1 is an enlarged view of region R2 of the capacitor module 1A.

[0021] Figure 5A This is a cross-sectional view showing a capacitor module 1B according to a second modification of the first embodiment.

[0022] Figure 5B Yes Figure 5A FIG. 1 is an enlarged view of region R3 of the capacitor module 1B.

[0023] Figure 6 It is a perspective view showing the capacitor module 2 according to the second embodiment of the present invention.

[0024] Figure 7 yes Figure 6 An exploded perspective view of the capacitor module 2.

[0025] Figure 8 Yes Figure 6 FIG. 4 is an enlarged view of region R4.

[0026] Fig.9A yes Figure 6 CC cross-sectional view of the capacitor module 2.

[0027] Fig. 9B Yes Fig.9AFIG. 1 is an enlarged view of region R5.

[0028] Fig.10 This is a partially enlarged view of a cross section of a capacitor module according to a modification of the second embodiment.

[0029] Fig.11 It is a perspective view showing a capacitor module 3 according to the third embodiment.

[0030] Fig.12 yes Fig.11 A perspective view of the capacitor module 3 from another direction.

[0031] Fig.13 It is a perspective view showing a capacitor module 3A according to a modification of the third embodiment.

[0032] Fig.14 yes Fig.13 A perspective view of the capacitor module 3A from another direction.

[0033] Fig.15 It is a schematic cross-sectional view showing a power conversion device 4 according to a fourth embodiment. DETAILED DESCRIPTION

[0034] (The process of completing this utility model)

[0035] Film capacitors using laminate films as an outer material for capacitor elements are known. For example, Patent Document 1 discloses a surface mount capacitor comprising: a capacitor element having lead wires and outer-wrapped with a laminate film; and a fixing plate having external connection terminals.

[0036] When a capacitor covered with a laminate film such as the surface mount capacitor described in Patent Document 1 is mounted in, for example, a power conversion device, there is a problem that excessive force is applied to the capacitor element, thereby damaging the laminate film.

[0037] Therefore, the inventors of the present invention have studied on a capacitor module having improved durability by preventing damage to a laminate film, and have completed the following invention.

[0038] The first embodiment of the present invention involves a capacitor module comprising: one or more capacitor elements covered by a laminate film; and a support body having a frame portion for fixing the laminate film, the laminate film having a covering portion covering the surface of the capacitor element and a flange portion extending from the outer edge of the covering portion, and the support body is fixed to the flange portion of the laminate film with the end face of the frame portion, thereby maintaining the capacitor element.

[0039] According to such a configuration, it is possible to provide a capacitor module that prevents damage to the laminate film and improves durability.

[0040] In the capacitor module according to the second aspect of the present invention, the support body may include a first support body and a second support body, and the flange portion may be sandwiched and fixed between a frame portion of the first support body and a frame portion of the second support body.

[0041] According to such a configuration, the flange portion can be sandwiched for fixation, and thus the capacitor element can be held without using an adhesive or the like.

[0042] In the capacitor module according to the third aspect of the present invention, fixing portions for fixing the first support body and the second support body may be provided on the outer side surface of the frame portion of the first support body and the outer side surface of the frame portion of the second support body.

[0043] According to such a configuration, it is possible to simultaneously perform fixation of the first support body and the second support body and fixation of the capacitor module to an external device.

[0044] In the capacitor module according to the fourth aspect of the present invention, the front end of the flange portion may be located within the width of the end surface of the frame portion.

[0045] According to such a structure, it is possible to suppress the flange portion from protruding from the support body due to manufacturing variations.

[0046] In the capacitor module according to the fifth aspect of the present invention, the support body may be formed in a cylindrical shape.

[0047] According to such a structure, the weight of the capacitor module can be reduced. In addition, since the capacitor element is covered with the laminate film, weather resistance can be ensured.

[0048] In the capacitor module according to the sixth aspect of the present invention, the support body may be formed in a box shape having a surface facing the covering portion of the laminate film.

[0049] According to such a configuration, the capacitor element can be supported by the facing surface, and the vibration resistance of the capacitor element can be improved.

[0050] In the capacitor module according to the seventh aspect of the present invention, a gap may be formed between the facing surface of the support body and the capacitor element.

[0051] According to such a structure, it is possible to suppress damage to the laminate film due to thermal expansion of the capacitor element.

[0052] In the capacitor module involved in the 8th mode of the present invention, it is also possible that in the direction intersecting the direction in which the flange portion extends, the position of the first end on the side close to the covering portion in the flange portion is different from the position of the second end on the side opposite to the first end.

[0053] According to such a structure, the capacitor element can be pressed against the facing surface without applying excessive force, so that the vibration resistance of the capacitor module can be improved.

[0054] In the capacitor module according to the ninth aspect of the present invention, the support body may include a plurality of housing portions partitioned by the frame portion, and the capacitor elements may be respectively housed in the plurality of housing portions.

[0055] According to such a structure, the number of capacitor elements can be increased so that desired electrical characteristics can be obtained.

[0056] In the capacitor module according to the tenth aspect of the present invention, at least a portion of flange portions of two adjacent capacitor elements may overlap.

[0057] Such a structure contributes to downsizing of the capacitor module.

[0058] In the capacitor module of the eleventh aspect of the present invention, the support body may include a plurality of support bodies, the plurality of support bodies may be overlapped and arranged in a direction intersecting with a direction in which the flange portion extends, and the flange portions of the plurality of capacitor elements may be sandwiched and fixed by frame portions of the plurality of support bodies.

[0059] According to such a configuration, the degree of freedom in arrangement of capacitor elements in the capacitor module can be improved.

[0060] The twelfth embodiment of the utility model involves an electric power conversion device comprising: a power semiconductor module; a capacitor element electrically connected to the power semiconductor module and covered by a laminate film; and a shell having a first housing portion for accommodating the power semiconductor module and a second housing portion for accommodating the capacitor element, the laminate film having a covering portion covering the surface of the capacitor element and a flange portion extending outward from the outer edge of the covering portion, the second housing portion of the shell being surrounded by a frame portion for fixing the laminate film, and the shell is fixed to the flange portion of the laminate film with the end face of the frame, thereby holding the capacitor element.

[0061] According to such a configuration, the case of the power conversion device can be used to fix the capacitor element, so the number of parts of the power conversion device can be reduced, and the manufacturing cost can be suppressed.

[0062] (Implementation method 1)

[0063] [Overall structure]

[0064] Figure 1 It is a perspective view showing the capacitor module 1 according to the first embodiment of the present invention. Figure 2 yes Figure 1 An exploded perspective view of the capacitor module 1 is shown in FIG. Figure 3A yes Figure 1 AA cross-sectional view of the capacitor module 1. Figure 3B yes Figure 1 BB cross-sectional view of the capacitor module 1. Figure 3C Yes Figure 3A The X, Y, and Z directions in the figure respectively represent the lateral direction, the height direction, and the longitudinal direction of the capacitor module 1 .

[0065] like Figure 1-2 As shown, the capacitor module 1 includes a capacitor element 31 and support bodies 11 and 21 .

[0066] <Capacitor Components>

[0067] The capacitor element 31 is covered with a laminate film 32. Figure 2 As shown, laminate film 32 includes coating portion 33 covering the surface of capacitor element 31 and flange portion 34 extending from the outer edge of coating portion 33 .

[0068] The capacitor element 31 is, for example, a film capacitor composed of a wound body or a laminated body of a dielectric film. Figure 2 As shown, the capacitor element 31 is a columnar film capacitor having an oblong cross section. As the dielectric film constituting the capacitor element 31, for example, a plastic film such as polyethylene terephthalate, polypropylene, polyphenylene sulfide, or polyethylene naphthalate can be used. As the metal vapor-deposited film formed on the surface of the plastic film, for example, a metal such as aluminum or zinc can be used.

[0069] The capacitor element 31 has two end surfaces. Figure 3B The capacitor element 31 is provided with two terminal electrodes 35 electrically connected to the two electrodes 36 formed on the two end faces. In the terminal electrode 35, the portion bonded to the laminate film 32 is preferably coated with a sealing material (not shown) for improving adhesion, airtightness and insulation. Even when a relatively thick terminal electrode is used, an opening is not generated between the laminate film 32 and the terminal electrode 35, and moisture resistance can be improved. In addition, when the laminate film 32 includes a metal layer, the insulation between the terminal electrode 35 and the metal layer can be improved. As a sealing material, for example, polypropylene containing an acid-modified resin can be used.

[0070] like Figure 1 as well as Figure 2As shown, capacitor element 31 has a rectangular shape when viewed from the height direction (Y direction), and is held by rectangular supports 11 and 21 described later.

[0071] <Laminating film>

[0072] The laminated film 32 is an outer packaging material that covers the capacitor element 31 and improves the moisture resistance of the capacitor element 31. As the laminated film 32, a film in which a resin film and an aluminum foil are bonded can be used. Specifically, an aluminum laminated film in which an aluminum foil is bonded between a resin film having heat sealability such as unstretched polypropylene (CPP) and a resin film having excellent strength such as nylon or polyethylene terephthalate by an adhesive or thermocompression bonding can be used. The aluminum layer is excellent in water vapor barrier properties, and by coating the capacitor element 31 with an aluminum laminated film having an aluminum layer, the moisture resistance of the capacitor element 31 can be improved. The effect of the utility model is not limited by the constituent material of the laminated film, and materials with high adhesion, water vapor barrier properties, strength or durability between the laminated films can be appropriately used.

[0073] By covering the capacitor element 31 with the laminate film 32, the weather resistance of the capacitor element 31 can be improved. As described above, the laminate film 32 has a covering portion 33 that covers the surface of the capacitor element 31 and a flange portion 34 extending from the outer edge of the covering portion 33. For example, the capacitor element 31 is sandwiched between two films and bonded by thermal fusion, thereby the capacitor element 31 can be covered with the laminate film 32. At this time, the film is in close contact with the capacitor element 31 to form the covering portion 33. In addition, at the outer edge of the covering portion 33, a flange portion 34 is formed in which two films overlap and bond. Therefore, the flange portion 34 is a bonding portion or a fusion portion in which the films overlap and bond or fuse each other. The width of the flange portion 34 is preferably 1 mm or more. By making the width of the flange portion 34 1 mm or more, the flange portion 34 can be easily fixed with the frame portions 12 and 22 of the support bodies 11 and 21 as described later.

[0074] In this embodiment, the capacitor element 31 is sandwiched between two films and heat-fused, so flanges 34 are formed on the four sides of the capacitor element 31. In other words, when viewed from the height direction (Y direction), flanges 34 are formed on the four sides of the rectangular capacitor element 31, and are continuously connected to form a ring shape. It is not necessary to form flanges 34 on all four sides of the capacitor element 31.

[0075] In the present embodiment, terminal electrode 35 is exposed from one side of flange portion 34 . Therefore, capacitor element 31 can be electrically connected to an external substrate or device through terminal electrode 35 .

[0076] <Support>

[0077] The support bodies 11 and 21 are used to hold the capacitor element 31 and mount the capacitor module 1 on an external substrate or device. In the present embodiment, the support bodies 11 and 21 are formed in a rectangular shape when viewed from the height direction (Y direction). In addition, in the present embodiment, the support bodies 11 and 21 include a first support body 11 and a second support body 21. In the present embodiment, the first support body 11 and the second support body 21 have the same shape. Therefore, the first support body 11 and the second support body 21 can be formed with the same mold, so the manufacturing cost of the capacitor module 1 can be reduced.

[0078] The support bodies 11 and 21 fix the flange portion 34 of the laminate film 32. In the present embodiment, the flange portion 34 of the laminate film 32 is sandwiched and fixed by the two support bodies 11 and 21.

[0079] The first support 11 has a frame 12 for holding the laminate film 32. Similarly, the second support 21 has a frame 22 for holding the laminate film 32. In this embodiment, Figure 3C As shown, the flange portion 34 of the laminate film 32 is fixed by sandwiching the end surface 12a of the frame portion 12 of the first support 11 and the end surface 22a of the frame portion 22 of the second support 21. By fixing the flange portion 34 of the laminate film 32 by the two supports 11 and 21, the capacitor element 31 can be held by the supports 11 and 21.

[0080] like Figure 1 as well as Figure 2 As shown, the support bodies 11 and 21 are formed in a cylindrical shape. Therefore, a portion of the capacitor element 31 is exposed from the support bodies 11 and 21. The capacitor element 31 is covered with the laminate film 32, so even if it is exposed from the support bodies 11 and 21, the moisture resistance and airtightness of the capacitor element 31 can be not impaired, and the capacitor module 1 can be miniaturized and lightweight.

[0081] In addition, in the present embodiment, the fixing portion 14 is provided on the outer side surface 13 of the first support body 11, and the fixing portion 24 is provided on the outer side surface 23 of the second support body 21. For example, by fastening the fixing portion 14 and the fixing portion 24 with screws or the like, the first support body 11 and the second support body 21 can be fixed. In addition, by fastening the fixing portion 14 and the fixing portion 24 with screws or the like, the flange portion 34 can be clamped and fixed without using an adhesive or the like. In addition to having the function of fixing the first support body 11 and the second support body 21, the fixing portions 14 and 24 also have the function of fixing the capacitor module 1 to an external substrate or device or the like.

[0082] As a material constituting the support bodies 11 and 21, for example, a resin such as polyphenylene sulfide, polybutylene terephthalate or liquid crystal polymer, or a metal such as an aluminum alloy can be used. When a resin is used as the material of the support bodies 11 and 21, the dimensional stability or strength of the support bodies 11 and 21 can be improved by mixing glass fiber or inorganic filler with the resin. When a metal is used as the material of the support bodies 11 and 21, the insulation between the terminal electrode 35 and the support bodies 11 and 21 can be ensured by providing a sufficient space between the terminal electrode 35 and the support bodies 11 and 21 or sandwiching an insulating material.

[0083] like Figure 3A to Figure 3C As shown in FIG. 1 , the flange portion 34 is sandwiched and fixed by the end surface 12a of the frame portion 12 of the first support body 11 and the end surface 22a of the frame portion 22 of the second support body 21. The flange portion 34 is a portion obtained by overlapping two films, and is therefore less likely to be damaged than the covering portion 33. Therefore, by fixing the flange portion 34 instead of fixing the covering portion 33, damage to the laminated film 32 can be suppressed.

[0084] As described above, when viewed from the height direction (Y direction), the capacitor element 31 is formed in a rectangular shape, and the flange portion 34 is formed to surround the four sides of the capacitor element 31. Figure 1 as well as Figure 2 As shown, flanges 34 disposed on all sides of capacitor element 31 are fixed by frames 12, 22 of supports 11, 21. By fixing flanges 34 on four sides by frames 12, 22 of supports 11, 21, capacitor element 31 can be held more stably.

[0085] [Effect]

[0086] According to the capacitor module 1 according to the first embodiment, the following effects can be achieved.

[0087] The capacitor module 1 includes a capacitor element 31 and support bodies 11 and 21. The capacitor element 31 is covered with a laminate film 32. The support bodies 11 and 21 include frame parts 12 and 22 for fixing the laminate film 32. The laminate film 32 includes a covering part 33 covering the capacitor element 31 and a flange part 34 extending from the outer edge of the covering part 33. The support bodies 11 and 21 fix the flange part 34 of the laminate film 32 with the end faces 12a and 22a of the frame parts 12 and 22, thereby holding the capacitor element 31.

[0088] According to such a configuration, it is possible to provide a capacitor module that prevents damage to the laminate film and improves durability.

[0089] The support body includes a first support body 11 and a second support body 21. The frame portion 12 of the first support body 11 and the frame portion 22 of the second support body 21 are fixed with a flange portion 34 interposed therebetween.

[0090] According to such a structure, flange portion 34 can be easily fixed to hold capacitor element 31 .

[0091] Fixing portions 14 and 24 for fixing the first support 11 and the second support 21 are provided on the outer side surface 13 of the frame portion 12 of the first support 11 and the outer side surface 23 of the frame portion 22 of the second support 21 .

[0092] According to such a structure, the first support 11 and the second support 21 can be fixed, and the first support 11 and the second support 21 can be fixed to an external substrate, device, or the like at the same time.

[0093] The support bodies 11 and 21 are formed in a cylindrical shape.

[0094] Such a structure contributes to weight reduction of capacitor module 1. Furthermore, since capacitor element 31 is covered with laminate film 32, weather resistance can be ensured even if capacitor element 31 is exposed from support bodies 11 and 21.

[0095] [Modifications]

[0096] In the above-mentioned embodiment, an example in which the capacitor module 1 includes one capacitor element 31 is described, but the present invention is not limited thereto. The capacitor module 1 may include a plurality of capacitor elements.

[0097] In the above-mentioned embodiment, an example in which the laminate film 32 is bonded by heat fusion is described, but the present invention is not limited thereto. The laminate film 32 may be bonded by using an adhesive or the like.

[0098] In addition, in the above-mentioned embodiment, an example in which the flange portions 34 arranged on the four sides of the capacitor element 31 are fixed is described, but it is sufficient as long as at least a part of the flange portions 34 arranged on the four sides of the capacitor element 31 is fixed by the support bodies 11 and 21. For example, when the capacitor element 31 is rectangular when viewed from the height direction (Y direction), the flange portions 34 arranged on the two opposing sides may be fixed by the support bodies 11 and 21.

[0099] In the above embodiment, capacitor element 31 is described as a columnar shape having an oblong cross section, but the present invention is not limited thereto. Capacitor element 31 may be in other shapes such as a cylindrical shape or a quadrangular prism shape.

[0100] In the above embodiment, the first support 11 and the second support 21 have the same shape, but the present invention is not limited thereto. The first support 11 and the second support 21 may have different shapes as long as the capacitor element 31 can be maintained.

[0101] Figure 4A This is a cross-sectional view showing a capacitor module 1A according to Modification 1 of Embodiment 1. Figure 4B Yes Figure 4A FIG. 1 is an enlarged view of region R2 of capacitor module 1A. Figure 4A As shown, the first support 111 and the second support 121 may be formed in a box shape.

[0102] The first support 111 may be formed in a box shape having a facing surface 112b facing the covering portion 33 of the laminate film 32. Similarly, the second support 121 may also be formed in a box shape having a facing surface 122b facing the covering portion 33 of the laminate film 32.

[0103] In addition, a gap G1 may be formed between the opposing surface 112b of the first support 111 and the covering portion 33 opposing the opposing surface 112b. Through the gap G1, even if thermal expansion occurs due to the use environment of the capacitor element 31, a certain gap can be ensured between the support bodies 111, 121 and the capacitor element 31. Therefore, damage to the covering portion 33 of the laminate film 32 caused by the thermal expansion of the capacitor element 31 can be suppressed.

[0104] On the other hand, the capacitor element 31 is pressed toward the facing surface 122b by the flange portion 34 sandwiched between the frame portions 112 and 122. Therefore, the facing surface 122b of the second support body 121 and the covering portion 33 facing the facing surface 122b are in contact with each other.

[0105] In addition, if Figure 4B As shown, the front end 34a of the flange portion 34 may be arranged to be accommodated within the width W1 of the end surfaces 112a and 122a of the frame portions 112 and 122. With such a configuration, it is possible to suppress the flange portion 34 from protruding from the support bodies 111 and 121 due to manufacturing variations.

[0106] Figure 5A This is a cross-sectional view showing a capacitor module 1B according to a second modification of the first embodiment. Figure 5B Yes Figure 5A FIG. 1 is an enlarged view of region R3 of capacitor module 1B. Figure 5AAs shown in FIG. 1 , in the height direction (Y direction), the first end 234c of the flange 234 near the covering portion 233 is disposed at a different position than the second end 234d on the opposite side of the first end 234c. The so-called height direction is a direction intersecting the direction in which the flange 234 extends. In other words, Figure 5B As shown, in the height direction, the position P1 of the first end portion 234c of the flange portion 234 and the position P2 of the second end portion 234d of the flange portion 234 are arranged to be offset from each other.

[0107] In the capacitor module 1B, the end surface 212a of the frame portion 212 of the first support body 211 and the end surface 222a of the frame portion 222 of the second support body 221 are arranged at a position different from the position of the first end portion 234c of the flange portion 234 in the height direction. Therefore, when the flange portion 234 is sandwiched and fixed by the frames 212 and 222, the flange portion 234 is stretched, and the capacitor element 31 can be pressed against the opposing surface 222b of the second support body 221 without applying excessive force. Therefore, the vibration resistance of the capacitor module 1B can be improved.

[0108] (Implementation method 2)

[0109] A capacitor module 2 according to a second embodiment of the present invention will be described.

[0110] In Embodiment 2, the description will be mainly about the points different from Embodiment 1. In Embodiment 2, the same reference numerals are given to the same or equivalent structures as those in Embodiment 1 and the description will be made. In addition, in Embodiment 2, the description overlapping with that in Embodiment 1 will be omitted.

[0111] Figure 6 It is a perspective view showing the capacitor module 2 according to the second embodiment of the present invention. Figure 7 yes Figure 6 An exploded perspective view of the capacitor module 2.

[0112] In the capacitor module 2 according to the second embodiment, as Figure 6 as well as Figure 7 As shown, the number of capacitor elements 31 and the shapes of support bodies 311 and 321 are different from those in Embodiment 1. In addition, in capacitor module 2, the difference from Embodiment 1 is that support bodies 311 and 321 each have three housing portions 315 and 325 for housing three capacitor elements 31.

[0113] like Figure 6 as well as Figure 7As shown, in the capacitor module 2, the support body includes a first support body 311 and a second support body 321. The first support body 311 and the second support body 321 are formed in the same shape. Therefore, the first support body 311 and the second support body 321 can be shared. The first support body 311 has three accommodating parts 315 divided by the frame part 312. Similarly, the second support body 321 has three accommodating parts 325 divided by the frame part 322. The capacitor element 31 is accommodated in each accommodating part 315, 325.

[0114] In the present embodiment, three capacitor elements 31 can be arranged side by side in the lateral direction (X direction). By supporting the three capacitor elements 31 with common support bodies 311 and 321 , space saving can be achieved.

[0115] Furthermore, a fixing portion 314 is provided on the outer side surface 313 of the first support body 311 , and a fixing portion 324 is provided on the outer side surface 323 of the second support body 321 .

[0116] Figure 8 Yes Figure 6 The area R4 is enlarged. Figure 7-Figure 8 As shown, notches 316 and 326 are formed on the end surface 312a of the frame portion 312 of the first support body 311 and the end surface 322a of the frame portion 322 of the second support body 321 for inserting the terminal electrode 35 of the capacitor element 31. By forming the notches 316 and 326 on the end surfaces 312a and 322a, it is possible to suppress the contact between the terminal electrode 35 and the support bodies 311 and 321.

[0117] Fig.9A yes Figure 6 CC cross-sectional view of the capacitor module 2. Fig. 9B Yes Fig.9A The area R5 is enlarged. Figure 9A to Figure 9B As shown in FIG. 1 , the frame portions 312 b and 322 b disposed between two adjacent capacitor elements 31 may be formed to be wider than the frame portions 312 c and 322 c disposed at the ends of the support bodies 311 and 321. In this case, Fig. 9B As shown, the flanges 34 can be fixed without overlapping each other. In addition, the flanges 34 of two adjacent capacitor elements 31 are fixed by a pair of frame portions 312b and 322b. Therefore, the two capacitor elements 31 can be held by a pair of frame portions 312b and 322b, which contributes to the miniaturization of the capacitor module 2.

[0118] [Effect]

[0119] According to the capacitor module 2 according to the second embodiment, the following effects can be achieved.

[0120] Support bodies 311 and 321 have a plurality of housing portions 315 and 325 partitioned by frame portions 312 and 322. Capacitor elements 31 are housed in each of the plurality of housing portions 315 and 325.

[0121] According to such a structure, the number of capacitor elements can be increased so as to obtain desired electrical characteristics. In addition, since a plurality of capacitor elements can be held by a common support body, the manufacturing man-hours can be reduced compared to arranging a plurality of capacitor modules 1 of the first embodiment, and space saving can also be achieved.

[0122] Furthermore, by arranging capacitor elements 31 so that terminal electrodes 35 are arranged in the lateral direction (X direction), many capacitor elements 31 can be arranged in the lateral direction.

[0123] [Modifications]

[0124] In the above embodiment, the capacitor module 2 has an example in which the support bodies 311 and 321 can hold three capacitor elements 31 , but the present invention is not limited thereto. The support body may be any shape as long as it can hold two or more capacitor elements 31 .

[0125] In addition, in the above-mentioned embodiment, an example in which the capacitor elements 31 are arranged in the horizontal direction (X direction) is described, but it is not limited to this. It can also be a shape of a support body that can arrange the capacitor elements 31 in the vertical direction (Z direction). Alternatively, it can also be a shape of a support body that can arrange multiple capacitor elements 31 in the vertical direction and the horizontal direction.

[0126] Fig.10 FIG. 2 is a diagram showing a partially enlarged cross section of a capacitor module according to a modification of Embodiment 2. Fig.10 As shown, at least a portion of flange portions 34 of two adjacent capacitor elements 31 may overlap. With such a structure, further space saving can be achieved.

[0127] (Implementation method 3)

[0128] A capacitor module 3 according to a third embodiment of the present invention will be described.

[0129] In Embodiment 3, the points different from Embodiment 1 are mainly described. In Embodiment 3, the same reference numerals are given to the same or equivalent structures as those in Embodiment 1 and described. In addition, in Embodiment 3, the description overlapping with that in Embodiment 1 is omitted.

[0130] Fig.11 It is a perspective view showing a capacitor module 3 according to the third embodiment. Fig.12 yes Fig.113 is a perspective view of the capacitor module 3 from another direction. Embodiment 3 is different from Embodiment 1 in that a plurality of capacitor elements 31 are held by overlapping a plurality of supports in the height direction (Y direction).

[0131] like Fig.11 as well as Fig.12 As shown, the capacitor module 3 includes a first support body 411, a second support body 421, a third support body 431, and a fourth support body 441 as four support bodies. In the present embodiment, the first support body 411 and the fourth support body 441 have the same shape and can be shared. On the other hand, the second support body 421 and the third support body 431 have different shapes and cannot be shared. The four support bodies 411 to 441 are arranged overlapping in the height direction (Y direction). One capacitor element 31 is held by the first support body 411 and the second support body 421, one capacitor element 31 is held by the second support body 421 and the third support body 431, and one capacitor element 31 is held by the third support body 431 and the fourth support body 441. Therefore, in the capacitor module 3, three capacitor elements 31 can be held by the four support bodies 411 to 441.

[0132] Two fixing portions 414 are provided on the outer side surface 413 of the first support body 411. Two fixing portions 424 and two fixing portions 425 are provided on the outer side surface 423 of the second support body 421. Two fixing portions 434 and two fixing portions 435 are provided on the outer side surface 433 of the third support body 431. Two fixing portions 444 are provided on the outer side surface 443 of the fourth support body 441.

[0133] The first support 411 and the second support 421 are fixed by fastening the fixing portion 414 and the fixing portion 424. The second support 421 and the third support 431 are fixed by fastening the fixing portion 425 and the fixing portion 435. The third support 431 and the fourth support 441 are fixed by fastening the fixing portion 434 and the fixing portion 444.

[0134] Therefore, the first support 411 at the uppermost layer and the fourth support 441 at the lowermost layer have two fixing portions 414 and 444 respectively, and the second support 421 and the third support 431 located in the middle have a total of four fixing portions 424, 425, 434, and 435 respectively.

[0135] The two fixing portions 414 provided on the first support body 411 are respectively provided at different positions in the longitudinal direction (Z direction). Specifically, one fixing portion 414a is provided at position Z1 in the longitudinal direction, and the other fixing portion 414b is provided at position Z2 in the longitudinal direction. Similarly, the two fixing portions 444 provided on the fourth support body 441 are respectively provided at different positions in the longitudinal direction. One fixing portion 444a is provided at position Z1 in the longitudinal direction, and the other fixing portion 444b is provided at position Z2 in the longitudinal direction.

[0136] In addition, the positions of the two fixing parts 424 provided on the second support body 421 in the longitudinal direction (Z direction) are different. One fixing part 424a is arranged at the position Z1 in the longitudinal direction, and the other fixing part 424b is arranged at the position Z2 in the longitudinal direction. Furthermore, the positions of the two fixing parts 425 provided on the second support body 421 in the longitudinal direction are also different. One fixing part 425a is arranged at the position Z1 in the longitudinal direction, and the other fixing part 425b is arranged at the position Z2 in the longitudinal direction.

[0137] In addition, the positions of the two fixing parts 434 provided on the third support body 431 in the longitudinal direction (Z direction) are different. One fixing part 434a is arranged at the position Z1 in the longitudinal direction, and the other fixing part 434b is arranged at the position Z2 in the longitudinal direction. Furthermore, the positions of the two fixing parts 435 provided on the third support body 431 in the longitudinal direction are also different. One fixing part 435a is arranged at the position Z1 in the longitudinal direction, and the other fixing part 435b is arranged at the position Z2 in the longitudinal direction.

[0138] By staggering the positions at which the fixing parts are arranged, fastening with screws or the like can be easily performed.

[0139] [Effect]

[0140] According to the capacitor module 3 according to the third embodiment, the following effects can be achieved.

[0141] The support body includes a plurality of support bodies 411, 421, 431, and 441. The plurality of support bodies 411, 421, 431, and 441 are arranged to overlap in a direction (Y direction) intersecting the direction in which the flange portion extends. The flange portions of the plurality of capacitor elements 31 are sandwiched and fixed by the frame portions of the plurality of support bodies 411, 421, 431, and 441.

[0142] According to such a structure, the degree of freedom in arrangement of the capacitor element can be improved.

[0143] [Modifications]

[0144] In the above-mentioned embodiment, an example in which three capacitor elements 31 are held is described, but the number of capacitor elements 31 is not limited thereto. Any configuration may be used as long as two or more capacitor elements 31 are held.

[0145] Fig.13 It is a perspective view showing a capacitor module 3A according to a modification of the third embodiment. Fig.14 yes Fig.13 A perspective view of the capacitor module 3A from another direction.

[0146] like Figure 13-14 As shown, all the fixing parts may be arranged at the same position in the longitudinal direction. Specifically, the fixing part 514 provided on the first support body 511, the fixing part 524 provided on the second support body 521, the fixing part 534 provided on the third support body 531, and the fixing part 544 provided on the fourth support body 541 are arranged in a straight line in the longitudinal direction.

[0147] According to such a configuration, the degree of freedom in designing the capacitor module 3A can be improved.

[0148] (Implementation method 4)

[0149] A power conversion device 4 according to a fourth embodiment of the present invention will be described.

[0150] In Embodiment 4, the points different from Embodiment 1 are mainly described. In Embodiment 4, the same reference numerals are given to the same or equivalent structures as those in Embodiment 1 and described. In addition, in Embodiment 4, the description overlapping with that in Embodiment 1 is omitted.

[0151] Fig.15 1 is a schematic cross-sectional view showing a power conversion device 4 according to Embodiment 4. Embodiment 4 is different from Embodiment 1 in that a capacitor element 31 is held by a case 61 of the power conversion device 4 .

[0152] The power conversion device 4 includes a power semiconductor module 51, a capacitor element 31, and a housing 61. The power semiconductor module 51 converts DC power and AC power to control frequency and voltage. The capacitor element 31 is covered by a laminate film 32. The laminate film 32 has a covering portion 33 covering the capacitor element and a flange portion 34 extending outward from the outer edge of the covering portion 33.

[0153] The power semiconductor module 51 and the capacitor element 31 are accommodated in a case 61. The case 61 has a first accommodation portion 62 accommodating the power semiconductor module 51 and a second accommodation portion 63 accommodating the capacitor element 31. The second accommodation portion 63 is surrounded by frames 64 and 65 for fixing the laminate film 32.

[0154] The capacitor element 31 is held in the case 61 by sandwiching the flange portion 34 between the end surface 64a of the frame portion 64 and the end surface 65a of the frame portion 65. In the present embodiment, the first case 61a and the second case 61b are combined to form the first housing portion 62 and the second housing portion 63. The first case 61a and the second case 61b can be fixed by fastening with screws, for example.

[0155] Capacitor element 31 is electrically connected to power semiconductor module 51 inside case 61 .

[0156] [Effect]

[0157] According to the power conversion device 4 according to the fourth embodiment, the following effects can be achieved.

[0158] The power conversion device 4 includes a power semiconductor module 51, a capacitor element 31, and a housing 61. The capacitor element 31 is electrically connected to the power semiconductor module 51. The capacitor element 31 is covered with a laminate film. The housing 61 has a first housing portion 62 for housing the power semiconductor module 51 and a second housing portion 63 for housing the capacitor element 31. The second housing portion 63 of the housing 61 is surrounded by frames 64 and 65 for fixing the laminate film. The housing 61 fixes the flange portion 34 of the laminate film with the end faces 64a and 65a of the frames 64 and 65, thereby holding the capacitor element 31.

[0159] According to such a configuration, by using the case 61 of the power semiconductor module 51 as a support body for holding the capacitor element 31 , the number of components can be reduced, and a compact and lightweight power conversion device 4 can be provided.

[0160] Industrial Applicability

[0161] The present invention is useful for capacitor modules used in various electronic devices, electrical devices, industrial devices, vehicle devices, and the like.

[0162] Description of Reference Numerals

[0163] 1, 1A, 1B, 2, 3, 3A: capacitor module;

[0164] 4: Power conversion device;

[0165] 11, 111, 211, 311, 411, 511: support (first support);

[0166] 12, 112, 212, 312: frame;

[0167] 12a, 112a, 212a, 312a: end faces;

[0168] 112b: opposite surface;

[0169] 13, 313, 413: lateral surface;

[0170] 14, 314, 414, 514: fixed part;

[0171] 315: Accommodation portion;

[0172] 21, 121, 221, 321, 421: support (second support);

[0173] 22, 122, 222, 322: frame;

[0174] 22a, 122a, 222a, 322a: end faces;

[0175] 122b, 222b: opposite surfaces;

[0176] 23, 323, 423: lateral surface;

[0177] 24, 424, 425, 524: fixed part;

[0178] 325: Accommodation portion;

[0179] 31: Capacitor element;

[0180] 32: Laminated film;

[0181] 33, 233: covering part;

[0182] 34, 234: flange portion;

[0183] 34a: front end;

[0184] 234c: 1st end;

[0185] 234d: 2nd end;

[0186] 51: Power semiconductor module;

[0187] 61: housing;

[0188] 62: first accommodation part;

[0189] 63: second accommodation part;

[0190] 64, 65: frame;

[0191] 64a, 65a: end surface;

[0192] 431, 531: the third support body;

[0193] 433: lateral surface;

[0194] 434, 534: fixed part;

[0195] 435: fixed part;

[0196] 441, 541: the fourth support;

[0197] 443: lateral surface;

[0198] 444, 544: fixed part.

Claims

1. A capacitor module, characterized in that: have: one or more capacitor elements covered by a laminate film; and A support having a frame portion for fixing the laminate film, The laminate film includes a covering portion covering the surface of the capacitor element and a flange portion extending from an outer edge of the covering portion. The support body fixes the flange portion of the laminate film with the end surface of the frame portion, thereby holding the capacitor element. The support body includes a first support body and a second support body, The flange portion is fixed by sandwiching the flange portion between the frame portion of the first support body and the frame portion of the second support body. A fixing portion for fixing the first support body and the second support body is provided on an outer side surface of the frame portion of the first support body and an outer side surface of the frame portion of the second support body.

2. The capacitor module according to claim 1, characterized in that: The front end of the flange portion is located within the width of the end surface of the frame portion.

3. The capacitor module according to claim 1 or 2, characterized in that: The support body is formed in a cylindrical shape.

4. The capacitor module according to claim 1 or 2, characterized in that: The support body is formed in a box shape having a surface facing the covering portion of the laminate film.

5. The capacitor module according to claim 4, characterized in that: A gap is formed between the facing surface of the support body and the capacitor element.

6. The capacitor module according to claim 5, characterized in that: In a direction intersecting the direction in which the flange portion extends, a first end portion of the flange portion on a side close to the covering portion is arranged at a position different from a second end portion on a side opposite to the first end portion.

7. The capacitor module according to claim 1 or 2, characterized in that: The support body includes a plurality of housing portions partitioned by the frame portion, and the capacitor elements are respectively housed in the plurality of housing portions.

8. The capacitor module according to claim 7, characterized in that: At least a portion of the flange portions of two adjacent capacitor elements overlap.

9. The capacitor module according to claim 7, characterized in that: The support body comprises a plurality of supports, The plurality of support bodies are arranged to overlap in a direction intersecting with a direction in which the flange portion extends. The flange portions of the plurality of capacitor elements are sandwiched and fixed by the frame portions of the plurality of support bodies.

10. A power conversion device, characterized in that: have: Power semiconductor modules; a capacitor element, electrically connected to the power semiconductor module and covered by a laminate film; and The housing has a first housing portion for housing the power semiconductor module and a second housing portion for housing the capacitor element. The laminate film includes a covering portion covering the surface of the capacitor element and a flange portion extending outward from an outer edge of the covering portion. The second storage portion of the housing is surrounded by a frame that fixes the laminate film. The case fixes the flange portion of the laminate film with the end surface of the frame portion, thereby holding the capacitor element.

Images