Capacitor, and manufacturing method thereof

Abstract

To provide a capacitor capable of improving the position accuracy of a first bus bar and a second bus bar while preventing resin from adhering to the first external terminal of the first bus bar and the second external terminal of the second bus bar.SOLUTION: A capacitor 1 includes: a capacitor element 2 having a first electrode 21 and a second electrode 22; a case 3 having a housing 30 for housing the capacitor element 2; a first bus bar 61 that has a first internal terminal 601 connected to the first electrode 21 and a first external terminal 611 extending outward of the housing 30, and is insert-molded into the case 3; a second bus bar 62 that has a second internal terminal 602 connected to the second electrode 22 and a second external terminal 612 extending outward the housing 30, and is insert-molded into the case 3; and a resin portion 8 filling the housing 30 and sealing the capacitor element 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates generally to capacitors and methods of manufacturing the same, and more particularly to capacitors including capacitor elements and methods of manufacturing the same. [Background technology]

[0002] Patent Document 1 discloses a capacitor. This capacitor includes a capacitor element, a bus bar, a case, a filling resin, a through hole, a connection terminal portion, and a ring-shaped sealing member.

[0003] Here, the bus bar is connected to the electrode of the capacitor element. The case houses the capacitor element with the bus bar connected to its electrode. The case housing the capacitor element is filled with a filling resin. The through hole is provided on one side of the case. The connection terminal portion is provided on the bus bar, leads out through the through hole to the outside, and is connectable to an external terminal. The ring-shaped sealing member surrounds the periphery of the connection terminal portion so as to be in close contact with the connection terminal portion, and abuts against the wall surface around the through hole on the inside of the case, thereby sealing the through hole through which the connection terminal portion passes from the inside of the case. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2019 / 131192 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the capacitor of Patent Document 1 has a problem in that it is difficult to improve the positional accuracy of the busbars. One of the reasons for this is that the through-holes have hole dimensions that are slightly larger than the horizontal cross-sectional dimensions of the connection terminals.

[0006] Furthermore, in the capacitor of Patent Document 1, the upper connection terminals are led out from the opening on the top surface of the case, which causes a problem that when liquid filling resin is poured into the case, the liquid filling resin tends to adhere to the tip of the upper connection terminals (around the mounting hole in Patent Document 1), where it is not desirable to have the resin adhere to the tip.

[0007] An object of the present disclosure is to provide a capacitor and a manufacturing method thereof that can improve the positional accuracy of a first bus bar and a second bus bar and can prevent resin from adhering to the first external terminal of the first bus bar and the second external terminal of the second bus bar. [Means for solving the problem]

[0008] A capacitor according to one embodiment of the present disclosure comprises: a capacitor element having a first electrode and a second electrode; a case having an accommodating portion for accommodating the capacitor element; a first bus bar having a first internal terminal connected to the first electrode and a first external terminal extending outside the accommodating portion, and insert-molded into the case; a second bus bar having a second internal terminal connected to the second electrode and a second external terminal extending outside the accommodating portion, and insert-molded into the case; and a resin portion filled in the accommodating portion and sealing the capacitor element.

[0009] A method for manufacturing a capacitor according to one embodiment of the present disclosure includes a preparation step of preparing a support member on which a first bus bar having a first internal terminal and a first external terminal and a second bus bar having a second internal terminal and a second external terminal are insert-molded, and a capacitor element having a first electrode and a second electrode; a connection step of connecting the first internal terminal to the first electrode and the second internal terminal to the second electrode; an accommodation step of closing one end of a tubular member with the support member to form an accommodating portion and accommodating the capacitor element in the accommodating portion; and a sealing step of filling the accommodating portion with resin and curing the resin to seal the capacitor element. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to improve the positional accuracy of the first bus bar and the second bus bar, and also to prevent resin from adhering to the first external terminal of the first bus bar and the second external terminal of the second bus bar. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view illustrating a capacitor according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a plan view showing the capacitor (excluding the cylindrical member and the resin portion). [Figure 3] FIG. 3 is a bottom view showing the capacitor. [Figure 4] FIG. 4 is a bottom view showing the cylindrical member. [Figure 5] FIG. 5 is a cross-sectional view showing the capacitor. [Figure 6] FIG. 6 is a perspective view showing one step of the method for manufacturing the capacitor. [Figure 7] FIG. 7 is a perspective view showing one step of the method for manufacturing the capacitor. [Figure 8] FIG. 8 is a perspective view showing a capacitor according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] 1. Overview In the capacitor of Patent Document 1, the through-hole has a hole dimension slightly larger than the horizontal cross-sectional dimension of the connection terminal. Although the through-hole is sealed from the inside of the case with a ring-shaped sealing member, it is difficult to improve the positional accuracy of the bus bar. Furthermore, in the capacitor of Patent Document 1, the upper connection terminal extends to the outside through an opening on the top surface of the case, which causes a problem that the resin easily adheres to the tip of the upper connection terminal when a liquid filling resin is injected into the case.

[0013] Therefore, in light of the above problems, the present inventors have conducted extensive research and have developed the following capacitor 1.

[0014] In this embodiment, first bus bar 61 and second bus bar 62 are insert-molded into case 3, as will be described in detail later.

[0015] Therefore, the positional accuracy of the first bus bar 61 and the second bus bar 62 can be improved.

[0016] Furthermore, in the capacitor 1 according to this embodiment, the first external terminal 611 of the first bus bar 61 and the second external terminal 612 of the second bus bar 62 are not present inside the accommodating section 30 but extend outside the accommodating section 30.

[0017] Therefore, adhesion of resin to the first external terminal 611 and the second external terminal 612 can be suppressed.

[0018] 2.Details (1) Capacitor The capacitor 1 according to this embodiment will be described below with reference to Figures 1 to 7. Note that each figure is a schematic diagram, and the ratios of the sizes and thicknesses of the components in each figure do not necessarily reflect the actual dimensional ratios.

[0019] The arrows indicating directions in each figure (arrows indicating the up-down direction, left-right direction, and front-to-back direction) are not intended to define the directions when the capacitor 1 is in use, but are merely shown to make the explanation easier to understand and have no substance. In this explanation, the direction in which the case 3 opens will be referred to as the "up-down direction," the direction in which the first electrode 21 and the second electrode 22 of the capacitor element 2 are aligned will be referred to as the "left-to-right direction," and the direction perpendicular to the up-down direction and left-to-right direction will be referred to as the "front-to-back direction." A view along the up-down direction will be referred to as a "planar view," a view along the left-to-right direction will be referred to as a "side view," and a view along the front-to-back direction will be referred to as a "front view."

[0020] 1, capacitor 1 according to this embodiment includes capacitor element 2, case 3, first bus bar 61, second bus bar 62, and resin part 8. Each component will be described below in order.

[0021] <Capacitor element> The capacitor element 2 is a main component of the capacitor 1. There are no particular limitations on the capacitor element 2, but examples thereof include a wound capacitor element and a multilayer capacitor element.

[0022] Specifically, the capacitor element 2 has an element body 20, a first electrode 21, and a second electrode 22.

[0023] In this embodiment, the element body 20 has a rectangular shape in plan view and front view, and a rounded rectangle in side view, but is not particularly limited to the shape of the element body 20. For example, the shape of the element body 20 may be a cylindrical shape, an elliptical cylindrical shape, a rectangular parallelepiped shape, or the like.

[0024] The element body 20 has a left side surface, a right side surface, and an outer peripheral surface. The outer peripheral surface is a surface that connects the outer peripheral edge of the left side surface with the outer peripheral edge of the right side surface.

[0025] The element body 20 includes a dielectric film, a first internal electrode, and a second internal electrode. Inside the element body 20, the first internal electrode and the second internal electrode face each other via the dielectric film. The first internal electrode and the second internal electrode are vapor-deposited on the dielectric film. Thus, the capacitor 1 is a film capacitor. Note that the first internal electrode and the second internal electrode are not shown in the figure.

[0026] The material of the dielectric film is not particularly limited, but examples thereof include polypropylene (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polycarbonate (PC), polystyrene (PS), etc. The outer peripheral surface of the element body 20 may be formed of a dielectric film, but may also be formed of an electrically insulating member other than a dielectric film.

[0027] A portion of the first internal electrode is exposed on the left side surface of the element body 20, but not on the right side surface. A portion of the second internal electrode is exposed on the right side surface of the element body 20, but not on the left side surface. The material of the first internal electrode and the second internal electrode is not particularly limited, but examples thereof include aluminum (Al), gold (Au), magnesium (Mg), zinc (Zn), tin (Sn), nickel (Ni), chromium (Cr), iron (Fe), copper (Cu), titanium (Ti), and alloys thereof.

[0028] The first electrode 21 is formed by spraying metal onto the left side surface of the element body 20. As a result, the first electrode 21 is electrically connected to the first internal electrode.

[0029] The second electrode 22 is formed by spraying metal onto the right side surface of the element body 20. As a result, the second electrode 22 is electrically connected to the second internal electrode.

[0030] The metal to be sprayed onto each of the first electrode 21 and the second electrode 22 is not particularly limited, but examples thereof include zinc (Zn), tin (Sn), and alloys thereof.

[0031] <Case> The case 3 is a member that houses the capacitor element 2. That is, the case 3 has a housing portion 30 that houses the capacitor element 2. As shown in Fig. 5 , the housing portion 30 is a space that opens upward and is surrounded by an inner bottom surface 31 and an inner circumferential surface 32.

[0032] In this embodiment, the case 3 has a support member 4 and a cylindrical member 5. The housing portion 30 is formed by combining the support member 4 and the cylindrical member 5.

[0033] <Supporting member> The support member 4 is a member that supports the capacitor element 2. The support member 4 is generally plate-shaped and has a thickness in the vertical direction. As shown in FIG. 2, in plan view, the outer periphery of the support member 4 is located outside the outer periphery of the capacitor element 2. In other words, the support member 4 is slightly larger than the capacitor element 2 in plan view.

[0034] The support member 4 includes an inner bottom surface 31 of the accommodation portion 30, at least one fastening portion 300 (two in this embodiment), and a first fitting portion 91.

[0035] The inner bottom surface 31 is a surface that supports the capacitor element 2. In plan view, the inner bottom surface 31 is a surface of the upper surface of the support member 4 that forms a rounded rectangle surrounded by the tubular member 5. In plan view, the inner bottom surface 31 is slightly larger than the capacitor element 2.

[0036] The fastening portion 300 is a portion that is fastened to an external device (not shown). In this embodiment, the fastening portion 300 is present on the outer surface of the support member 4. The fastening portion 300 has a collar 301. The collar 301 is a cylindrical member that penetrates in the vertical direction. A nut, a positioning pin, or the like may be used instead of the collar 301. The external device is not particularly limited, but an example thereof is an inverter case made of die-cast aluminum.

[0037] In this embodiment, the first fitting portion 91 is a groove recessed downward, as shown in Fig. 5. The first fitting portion 91 has a rounded rectangular ring shape in a plan view, as shown in Fig. 2, and surrounds the inner bottom surface 31.

[0038] The support member 4 has electrical insulation properties. The material of the support member 4 is not particularly limited, but examples thereof include polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and epoxy resin (EP).

[0039] <Cylindrical member> The cylindrical member 5 is a member that surrounds the periphery of the capacitor element 2 in a plan view. In this embodiment, the cylindrical member 5 has a generally rectangular cylindrical shape, as shown in Fig. 6. The length (vertical direction) of the cylindrical member 5 is longer than the length (vertical direction) of the capacitor element 2.

[0040] As shown in FIGS. 4 and 5, the cylindrical member 5 includes an inner circumferential surface 32 of the accommodation portion 30 and a second fitting portion 92.

[0041] Inner circumferential surface 32 is the surface facing capacitor element 2. Inner circumferential surface 32 and capacitor element 2 are separated from each other and are not in direct contact with each other.

[0042] The second fitting portion 92 is a portion that can be fitted into the first fitting portion 91 of the support member 4. That is, in this embodiment, the second fitting portion 92 is a convex portion that protrudes downward, as shown in Fig. 5. As shown in Fig. 4, the second fitting portion 92 has a rounded rectangular ring shape in plan view that is approximately the same size as the first fitting portion 91.

[0043] 5, when the second fitting portion 92 of the tubular member 5 is fitted into the first fitting portion 91 of the support member 4, one end (lower end) of the tubular member 5 is closed by the support member 4. The other end (upper end) of the tubular member 5 remains open. As a result, the inner bottom surface 31 of the support member 4 and the inner circumferential surface 32 of the tubular member 5 form the storage section 30.

[0044] The cylindrical member 5 is electrically insulating, similar to the support member 4. The cylindrical member 5 is made of the same material as the support member 4.

[0045] <First bus bar> 5 and 6, the first bus bar 61 is insert-molded into the case 3. In this embodiment, the first bus bar 61 is insert-molded into the support member 4. Therefore, the first bus bar 61 is integrated with the support member 4.

[0046] The first bus bar 61 is a conductive member. The material of the first bus bar 61 is not particularly limited, but examples thereof include copper (Cu), aluminum (Al), and alloys thereof.

[0047] 3 and 6, the first bus bar 61 has a first inner terminal 601, a first outer terminal 611, and a first intermediate portion 621. The first inner terminal 601, the first outer terminal 611, and the first intermediate portion 621 are integrated together.

[0048] The first internal terminal 601 is connected to the first electrode 21 by, for example, soldering (see FIGS. 2 and 5). As shown in FIG. 6, the first internal terminal 601 extends outward from the inner bottom surface 31 of the support member 4. Specifically, the first internal terminal 601 extends upward from the inner bottom surface 31. In this manner, the first internal terminal 601 is present inside the accommodating section 30. As shown in FIG. 5, the first internal terminal 601 and the inner circumferential surface 32 of the tubular member 5 are separated from each other and are not in direct contact with each other.

[0049] The first external terminal 611 is not present inside the accommodating section 30, but extends to the outside of the accommodating section 30 (see FIGS. 1 and 3). Specifically, the first external terminal 611 extends from the lower surface of the support member 4 to the opposite side (lower side) of the opening of the accommodating section 30.

[0050] 3 and 5, the first intermediate portion 621 extends in the front-rear direction and is embedded inside the support member 4. The first intermediate portion 621 connects the first internal terminal 601 and the first external terminal 611. That is, the first internal terminal 601 extends upward from the left end of the first intermediate portion 621. Meanwhile, the first external terminal 611 extends downward from the front end of the first intermediate portion 621. Therefore, the first internal terminal 601 and the first external terminal 611 are located at different positions in a plan view.

[0051] <Second bus bar> 5 and 6, the second bus bar 62, like the first bus bar 61, is also insert-molded into the case 3. Specifically, like the first bus bar 61, the second bus bar 62 is also insert-molded into the support member 4. Therefore, the second bus bar 62 is also integrated with the support member 4.

[0052] The second bus bar 62 is also a conductive member. The material of the second bus bar 62 is the same as the material of the first bus bar 61.

[0053] 3 and 6, the second bus bar 62 has a second inner terminal 602, a second outer terminal 612, and a second intermediate portion 622. The second inner terminal 602, the second outer terminal 612, and the second intermediate portion 622 are integrated together.

[0054] The second internal terminal 602 is connected to the second electrode 22 by, for example, soldering (see FIGS. 2 and 5). As shown in FIG. 6, the second internal terminal 602 extends outward from the inner bottom surface 31 of the support member 4. Specifically, the second internal terminal 602 extends upward from the inner bottom surface 31. In this manner, the second internal terminal 602 is present inside the accommodating section 30. As shown in FIG. 5, the second internal terminal 602 and the inner circumferential surface 32 of the tubular member 5 are separated from each other and are not in direct contact with each other.

[0055] The second internal terminal 602 faces the first internal terminal 601 in the left-right direction. The distance between the first internal terminal 601 and the second internal terminal 602 is approximately equal to the length of the capacitor element 2 (left-right direction).

[0056] The second external terminal 612 is not present inside the accommodating section 30, but extends to the outside of the accommodating section 30 (see FIGS. 1 and 3). Specifically, the second external terminal 612 extends from the lower surface of the support member 4 to the opposite side (lower side) of the opening of the accommodating section 30. The first external terminal 611 and the second external terminal 612 are aligned in the left-right direction.

[0057] 3 and 5, like the first intermediate portion 621, the second intermediate portion 622 also extends in the front-rear direction and is embedded inside the support member 4. In this way, the second intermediate portion 622 is parallel to the first intermediate portion 621. The second intermediate portion 622 connects the second internal terminal 602 and the second external terminal 612. That is, the second internal terminal 602 extends upward from the right end of the second intermediate portion 622. Meanwhile, the second external terminal 612 extends downward from the front end of the second intermediate portion 622. Therefore, the second internal terminal 602 and the second external terminal 612 are located at different positions in a plan view.

[0058] <Resin part> 1 and 5, the resin portion 8 fills the accommodation portion 30. Specifically, within the accommodation portion 30, the resin portion 8 fills the gap between the inner circumferential surface 32 of the tubular member 5 and the capacitor element 2, the gap between the first inner terminal 601 and the inner circumferential surface 32 of the tubular member 5, and the gap between the second inner terminal 602 and the inner circumferential surface 32 of the tubular member 5. Furthermore, the upper surface of the resin portion 8 is located higher than the upper surface of the capacitor element 2. Therefore, the capacitor element 2, the first inner terminal 601, and the second inner terminal 602 are buried in the resin portion 8. In this way, the resin portion 8 seals the capacitor element 2.

[0059] The resin portion 8 is a cured resin. Examples of the resin include a thermosetting resin, a photocurable resin, etc. The resin is not particularly limited, but examples thereof include an epoxy resin.

[0060] <Action and effect> In the capacitor 1 according to this embodiment, the first bus bar 61 and the second bus bar 62 are insert-molded into the case 3. Specifically, the first bus bar 61 and the second bus bar 62 are insert-molded into the support member 4.

[0061] This improves the positional accuracy of the first bus bar 61 and the second bus bar 62. In particular, in this embodiment, as shown in FIGS. 3 and 5, the first intermediate portion 621 is embedded inside the support member 4 while extending in one direction (the front-to-rear direction), so the contact area between the first bus bar 61 and the support member 4 can be increased compared to when the first intermediate portion 621 is not present. Therefore, the position of the first bus bar 61 is hardly shifted on the support member 4. The same applies to the second bus bar 62.

[0062] Furthermore, in the capacitor 1 according to this embodiment, the first external terminal 611 of the first bus bar 61 and the second external terminal 612 of the second bus bar 62 are not present inside the accommodating section 30 but extend outside the accommodating section 30 (see FIGS. 1 and 3). Specifically, the first external terminal 611 and the second external terminal 612 extend from the lower surface of the support member 4 to the side opposite (downward from) the opening of the accommodating section 30.

[0063] Therefore, adhesion of resin to first external terminal 611 of first bus bar 61 and second external terminal 612 of second bus bar 62 can be suppressed.

[0064] Furthermore, in the capacitor 1 according to this embodiment, the support member 4 includes the fastening portion 300. Therefore, the capacitor 1 can be attached to an external device by the fastening portion 300.

[0065] (2) Capacitor manufacturing method Next, a method for manufacturing the capacitor 1 according to this embodiment will be described with reference to Figures 6 and 7. The method for manufacturing the capacitor 1 includes a preparation step, a connection step, an accommodation step, and a sealing step.

[0066] <Preparation process> 6, in the preparation step, the support member 4 and the capacitor element 2 are prepared. As described above, the first bus bar 61 and the second bus bar 62 are insert-molded into the support member 4 in advance. In other words, the support member 4, the first bus bar 61, and the second bus bar 62 are integrated.

[0067] <Connection process> 7, in the connection step, the capacitor element 2 is placed on the inner bottom surface 31 of the support member 4, and the first internal terminal 601 is connected to the first electrode 21, and the second internal terminal 602 is connected to the second electrode 22. The first internal terminal 601 can be connected to the first electrode 21 by, for example, soldering. Similarly, the second internal terminal 602 can be connected to the second electrode 22 by, for example, soldering. At the connection step, the cylindrical member 5 is not present around the capacitor element 2, so that operations such as soldering can be easily performed.

[0068] <Containment process> In the accommodating step, the second fitting portion 92 of the cylindrical member 5 is fitted into the first fitting portion 91 of the support member 4, thereby closing one end (lower end) of the cylindrical member 5 with the support member 4 to form the accommodating portion 30. In this manner, the capacitor element 2 is accommodated in the accommodating portion 30. When closing one end of the cylindrical member 5 with the support member 4, the cylindrical member 5 and the support member 4 may be joined together using an adhesive. For example, the first fitting portion 91 and the second fitting portion 92 may be bonded together with an adhesive.

[0069] <Sealing process> In the sealing process, the housing portion 30 is filled with resin. That is, liquid resin is poured into the housing portion 30 from above. Specifically, while taking into consideration the cure shrinkage of the resin, the liquid resin is poured into the housing portion 30 until the liquid level of the resin is higher than the top surface of the capacitor element 2. The resin is then cured to seal the capacitor element 2, thereby obtaining the capacitor 1 shown in FIG. 1.

[0070] <Action and effect> In the method for manufacturing capacitor 1 according to this embodiment, first bus bar 61 and second bus bar 62 are insert molded into case 3. Specifically, first bus bar 61 and second bus bar 62 are insert molded into support member 4.

[0071] Therefore, in the manufactured capacitor 1, the positional accuracy of the first bus bar 61 and the second bus bar 62 can be improved.

[0072] Furthermore, in the method for manufacturing the capacitor 1 according to this embodiment, the first external terminal 611 of the first bus bar 61 and the second external terminal 612 of the second bus bar 62 are not present inside the accommodating portion 30 but extend outside the accommodating portion 30 (see FIGS. 1 and 3). Specifically, the first external terminal 611 and the second external terminal 612 extend from the lower surface of the support member 4 to the side opposite (downward from) the opening of the accommodating portion 30. Therefore, when filling the accommodating portion 30 with resin in the sealing step, it is possible to prevent the resin from adhering to the first external terminal 611 of the first bus bar 61 and the second external terminal 612 of the second bus bar 62.

[0073] In this way, the manufacturing method of the capacitor 1 according to this embodiment makes it possible to easily manufacture a capacitor 1 having high positional accuracy of the first bus bar 61 and the second bus bar 62 and suppressing adhesion of resin to the first external terminal 611 and the second external terminal 612.

[0074] Furthermore, in the method for manufacturing capacitor 1 according to this embodiment, case 3 has support member 4 and tubular member 5. Therefore, if tubular member 5 is separated from support member 4 at the connection step, there is no tubular member 5 around capacitor element 2, which makes it easy to perform operations such as soldering.

[0075] Therefore, it is easy to connect the first internal terminal 601 to the first electrode 21, and it is easy to connect the second internal terminal 602 to the second electrode 22.

[0076] As described above, the connection between the first electrode 21 and the first internal terminal 601 and the connection between the second electrode 22 and the second internal terminal 602 can be performed with the cylindrical member 5 separated from the support member 4, so the gap between the first internal terminal 601 and the inner circumferential surface 32 and the gap between the second internal terminal 602 and the inner circumferential surface 32 can be made as narrow as possible. In other words, the case 3 can be made more compact.

[0077] Furthermore, in the method for manufacturing capacitor 1 according to this embodiment, support member 4 includes first fitting portion 91, and tubular member 5 includes second fitting portion 92. Therefore, by fitting first fitting portion 91 of support member 4 with second fitting portion 92 of tubular member 5, it is possible to prevent support member 4 and tubular member 5 from coming off when resin is filled into accommodation portion 30.

[0078] 3. Variations Fig. 8 shows a capacitor 1 according to a modified example. This capacitor 1 is similar to the capacitor 1 shown in Fig. 1 in that the first external terminal 611 and the second external terminal 612 extend outside the accommodating section 30, but the specific orientations of the first external terminal 611 and the second external terminal 612 are different. That is, in the capacitor 1 shown in Fig. 8, the first external terminal 611 and the second external terminal 612 extend forward from the outer surface of the support member 4. Even in this case, it is possible to prevent resin from adhering to the first external terminal 611 and the second external terminal 612.

[0079] In the above embodiment, the support member 4 includes the fastening portion 300, but the tubular member 5 may include the fastening portion 300 instead of the support member 4, or both the support member 4 and the tubular member 5 may include the fastening portion 300.

[0080] In the above embodiment, the tubular member 5 has a rectangular tubular shape, but the tubular member 5 may have a cylindrical shape.

[0081] In the above embodiment, the first fitting portion 91 is a groove and the second fitting portion 92 is a protrusion, but the first fitting portion 91 may be a protrusion and the second fitting portion 92 may be a groove.

[0082] 4. Aspects As is clear from the above-described embodiments and modifications, the present disclosure includes the following aspects. In the following, reference numerals are given in parentheses only to clarify the correspondence with the embodiments.

[0083] The first aspect is a capacitor (1) comprising: a capacitor element (2) having a first electrode (21) and a second electrode (22); a case (3) having an accommodating portion (30) for accommodating the capacitor element (2); a first bus bar (61) having a first internal terminal (601) connected to the first electrode (21) and a first external terminal (611) extending outside the accommodating portion (30) and insert-molded into the case (3); a second bus bar (62) having a second internal terminal (602) connected to the second electrode (22) and a second external terminal (612) extending outside the accommodating portion (30) and insert-molded into the case (3); and a resin portion (8) filled in the accommodating portion (30) and sealing the capacitor element (2).

[0084] According to this embodiment, the positional accuracy of the first bus bar (61) and the second bus bar (62) can be improved, and adhesion of resin to the first external terminal (611) of the first bus bar (61) and the second external terminal (612) of the second bus bar (62) can be suppressed.

[0085] The second aspect is a capacitor (1) based on the first aspect. In the second aspect, the case (3) includes a support member (4) that includes the inner bottom surface (31) of the storage portion (30) and supports the capacitor element (2), and a tubular member (5) that includes the inner circumferential surface (32) of the storage portion (30) and has one end closed by the support member (4).

[0086] According to this embodiment, it is easy to connect the first internal terminal (601) to the first electrode (21), and it is easy to connect the second internal terminal (602) to the second electrode (22).

[0087] A third aspect is a capacitor (1) based on the second aspect. In the third aspect, the support member (4) and / or the tubular member (5) further includes a fastening portion (300) that is fastened to an external device.

[0088] According to this embodiment, the capacitor (1) can be attached to an external device by the fastening portion (300).

[0089] A fourth aspect is a capacitor (1) based on the second or third aspect. In the fourth aspect, the support member (4) further includes a first fitting portion (91), and the tubular member (5) further includes a second fitting portion (92) that can be fitted into the first fitting portion (91).

[0090] According to this aspect, by engaging the first fitting portion (91) of the support member (4) with the second fitting portion (92) of the tubular member (5), it is possible to prevent the support member (4) and the tubular member (5) from coming off when filling the storage portion (30) with resin.

[0091] The fifth aspect is a method for manufacturing a capacitor (1), comprising: a preparation step of preparing a support member (4) on which a first bus bar (61) having a first internal terminal (601) and a first external terminal (611), and a second bus bar (62) having a second internal terminal (602) and a second external terminal (612) are insert-molded; and a capacitor element (2) having a first electrode (21) and a second electrode (22); a connection step of connecting the first internal terminal (601) to the first electrode (21) and connecting the second internal terminal (602) to the second electrode (22); an accommodation step of closing one end of a tubular member (5) with the support member (4) to form an accommodating section (30), and accommodating the capacitor element (2) in the accommodating section (30); and a sealing step of filling the accommodating section (30) with resin and hardening the resin to seal the capacitor element (2).

[0092] According to this aspect, it is possible to easily manufacture a capacitor (1) having high positional accuracy of the first bus bar (61) and the second bus bar (62). When filling the accommodating portion (30) with resin, it is possible to prevent the resin from adhering to the first external terminal (611) of the first bus bar (61) and the second external terminal (612) of the second bus bar (62). [Explanation of symbols]

[0093] 1 capacitor 2 Capacitor elements 21 1st electrode 22 2nd electrode 3 Cases 30 Storage section 31 Inner bottom surface 32 Inner surface 300 Fastening part 4 Support member 5. Cylindrical member 61 First bus bar 601 1st internal terminal 611 First external terminal 62 Second bus bar 602 2nd internal terminal 612 Second external terminal 8 Resin part 91 First fitting part 92 Second fitting part

Claims

1. a capacitor element having a first electrode and a second electrode; a case having a housing portion for housing the capacitor element; a first bus bar that is insert-molded into the case and that includes a first internal terminal connected to the first electrode and a first external terminal extending outside the housing portion; a second bus bar that is insert-molded into the case and that includes a second internal terminal connected to the second electrode and a second external terminal extending outside the housing portion; a resin portion filled in the housing portion and sealing the capacitor element, Capacitor.

2. The case is a support member including an inner bottom surface of the housing portion and supporting the capacitor element; a cylindrical member including an inner circumferential surface of the storage portion, one end of which is closed by the support member; The capacitor of claim 1 .

3. The support member and / or the tubular member further include a fastening portion that is fastened to an external device. The capacitor according to claim 2 .

4. the support member further includes a first fitting portion, The cylindrical member further includes a second fitting portion that can be fitted into the first fitting portion. The capacitor according to claim 2 .

5. a preparation step of preparing a support member on which a first bus bar having a first internal terminal and a first external terminal and a second bus bar having a second internal terminal and a second external terminal are insert-molded, and a capacitor element having a first electrode and a second electrode; a connecting step of connecting the first internal terminal to the first electrode and connecting the second internal terminal to the second electrode; an accommodating step of closing one end of a cylindrical member with the support member to form an accommodating portion and accommodating the capacitor element in the accommodating portion; a sealing step of filling the housing with resin and curing the resin to seal the capacitor element, How to manufacture a capacitor.

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