Electrolytic capacitors

Abstract

The present invention provides an electrolytic capacitor that can improve the sealing performance between the housing and the sealing body. [Solution] The electrolytic capacitor 1 comprises a capacitor element 10 including an anode portion 11A and a cathode portion 11B, and a case 20 that houses the capacitor element 10. The case 20 has a housing 21 having an opening 211 and a sealing body 22 that closes the opening 211 of the housing 21. The sealing body 22 includes a terminal portion 31 consisting of an anode terminal portion 31A and a cathode terminal portion 31B, a frame portion 32 surrounding the terminal portion 31, and a sealing portion 33 that fills the space between the terminal portion 31 and the frame portion 32. The housing 21 has a bottom portion 213 located on the opposite side of the opening 211, and a side portion 212 extending from the outer circumference of the bottom portion 213 toward the opening 211 and surrounding the internal space of the housing 21. The side portion 212 includes an inclined surface 2121 such that the area of ​​the inner region of the side portion 212 in a cross-section parallel to the bottom portion 213 decreases from the opening 211 toward the bottom portion 213.

Description

Technical Field

[0001] The present disclosure relates to an electrolytic capacitor, and more particularly to an electrolytic capacitor including a capacitor element.

Background Art

[0002] Patent Document 1 discloses an electricity storage element including a container housing a power generation element, a liquid injection part provided on one side surface of the container and having a liquid injection hole for injecting an electrolytic solution, and a sealing plug for sealing the liquid injection hole. In this electricity storage element, the liquid injection hole is provided at the bottom surface of a recess recessed in one side surface of the container, and the sealing plug has an insertion part inserted into the liquid injection hole and a fitting part fitted into the recess. A plastic deformation part is formed at a predetermined position of at least one of the peripheral edge of the fitting part and the opening peripheral edge of the recess, the sealing plug is disposed eccentrically with respect to the liquid injection part on the opposite side of the plastic deformation part, and the outer peripheral side surface of the fitting part and the inner peripheral side surface of the recess are welded over the entire circumference. According to the technique of Patent Document 1, it is said that when welding the sealing plug to the liquid injection part, floating of the sealing plug can be prevented and the reliability of the sealing can be improved.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an electrolytic capacitor including a case having a housing and a sealing body, in order to enhance airtightness and the like, it is required to improve the sealing performance between the housing and the sealing body. However, it is difficult to apply the technique of Patent Document 1 to an electrolytic capacitor.

[0005] The present disclosure provides an electrolytic capacitor capable of improving the sealing performance between a housing and a sealing body. [Means for solving the problem]

[0006] An electrolytic capacitor according to one aspect of the present disclosure comprises a capacitor element including an anode portion and a cathode portion, and a case housing the capacitor element. The case has a housing having an opening and a sealing body that closes the opening of the housing. The sealing body includes a terminal portion consisting of an anode terminal portion and a cathode terminal portion, a frame portion surrounding the terminal portion, and a sealing portion filling the space between the terminal portion and the frame portion. The anode portion of the capacitor element is joined to the anode terminal portion. The cathode portion of the capacitor element is joined to the cathode terminal portion. The housing has a bottom portion located on the opposite side of the opening and a side portion extending from the outer circumference of the bottom portion toward the opening and enclosing the internal space of the housing. The side portion includes an inclined surface such that the area of ​​the region inside the side portion in a cross-section parallel to the bottom portion decreases toward the bottom portion from the opening.

[0007] An electrolytic capacitor according to one aspect of the present disclosure comprises a capacitor element including an anode portion and a cathode portion, and a case housing the capacitor element. The case has a housing having an opening and a sealing body that closes the opening of the housing. The sealing body includes a terminal portion consisting of an anode terminal portion and a cathode terminal portion, a frame portion surrounding the terminal portion, and a sealing portion filling the space between the terminal portion and the frame portion. The anode portion of the capacitor element is joined to the anode terminal portion. The cathode portion of the capacitor element is joined to the cathode terminal portion. The housing has a bottom portion located on the opposite side of the opening and a side portion extending from the outer circumference of the bottom portion toward the opening and enclosing the internal space of the housing. The sealing body has a plate-shaped central portion and an outer edge portion provided on the outer circumference of the central portion and extending toward the opening along the inner surface of the side portion.

[0008] An electrolytic capacitor according to one aspect of the present disclosure comprises a capacitor element including an anode portion and a cathode portion, and a case housing the capacitor element. The case has a housing having an opening and a sealing body that closes the opening of the housing. The sealing body includes a terminal portion consisting of an anode terminal portion and a cathode terminal portion, a frame portion surrounding the terminal portion, and a sealing portion filling the space between the terminal portion and the frame portion. The anode portion of the capacitor element is joined to the anode terminal portion. The cathode portion of the capacitor element is joined to the cathode terminal portion. The housing has a bottom portion located on the opposite side of the opening and a side portion extending from the outer circumference of the bottom portion toward the opening and enclosing the internal space of the housing. The side portion includes an inclined surface such that the area of ​​the region inside the side portion in a cross-section parallel to the bottom portion decreases toward the bottom portion from the opening. The sealing body has a plate-shaped central portion and an outer edge portion provided on the outer circumference of the central portion, which extends toward the opening along the inner surface of the side portion. [Effects of the Invention]

[0009] According to this disclosure, the sealing performance between the housing of the electrolytic capacitor and the sealing body can be improved. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic perspective view showing an example of a housing in an electrolytic capacitor according to the first embodiment of this disclosure. [Figure 2] Figure 2 is a schematic perspective view showing another example of a housing in an electrolytic capacitor according to the first embodiment of this disclosure. [Figure 3] Figure 3 is a schematic perspective view showing an example of a sealing body in an electrolytic capacitor according to the first embodiment of this disclosure. [Figure 4] Figure 4 is a schematic perspective view showing an example of an electrolytic capacitor according to the first embodiment of this disclosure. [Figure 5] Figure 5 is a schematic exploded view showing an example of an electrolytic capacitor according to the first embodiment of this disclosure. [Figure 6]Figure 6 is a schematic cross-sectional view of an electrolytic capacitor according to the first embodiment of this disclosure, along line XX in Figure 4. [Figure 7] Figure 7 is a schematic cross-sectional view of another example of an electrolytic capacitor according to the first embodiment of this disclosure, at a position corresponding to line XX in Figure 4. [Figure 8] Figure 8 is a schematic cross-sectional view of another example of an electrolytic capacitor according to the first embodiment of this disclosure, at a position corresponding to line XX in Figure 4. [Figure 9] Figure 9 is a schematic perspective view showing an example of a sealing body in an electrolytic capacitor according to the second embodiment of this disclosure. [Figure 10] Figure 10 is a schematic cross-sectional view of an example of an electrolytic capacitor according to the second embodiment of this disclosure, at a position corresponding to line XX in Figure 4. [Figure 11] Figure 11 is a schematic cross-sectional view of an example of an electrolytic capacitor according to the third embodiment of this disclosure, at a position corresponding to line XX in Figure 4. [Modes for carrying out the invention]

[0011] (1) Overview The following description of an electrolytic capacitor according to an embodiment will be made with reference to the drawings. However, the following embodiment is only one of many embodiments of this disclosure. The following embodiment can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure are achieved. In addition, the figures described in the following embodiments are schematic diagrams, and the ratios of the size and thickness of each component in the figures do not necessarily reflect the actual dimensional ratios.

[0012] As shown in Figures 4 and 5, the electrolytic capacitor 1 of this embodiment comprises a capacitor element 10 and a case 20 that houses the capacitor element 10. The case 20 has a housing 21 having an opening 211 and a sealing body 22 that closes the opening 211 of the housing 21. The housing 21 has a bottom portion 213 located on the opposite side of the opening 211 and a side portion 212 that extends from the outer circumference of the bottom portion 213 toward the opening 211 and surrounds the internal space of the housing 21.

[0013] An example of the housing 21 in the electrolytic capacitor 1 according to the first embodiment of the present disclosure is shown in FIGS. 1 and 2. An example of the sealing body of the electrolytic capacitor 1 according to the first embodiment of the present disclosure is shown in FIG. 3. An example of the electrolytic capacitor 1 according to the first embodiment of the present disclosure is shown in FIGS. 4 to 8.

[0014] In the housing 21 of the electrolytic capacitor 1 according to the first embodiment, the side surface portion 212 includes an inclined surface 2121 that is inclined such that the area of the inner region of the side surface portion 212 in a cross section parallel to the bottom surface portion 213 decreases from the opening 211 toward the bottom surface portion 213.

[0015] The electrolytic capacitor 1 according to the first embodiment has a tapered shape in which the housing 21 narrows from the opening 211 toward the bottom surface portion 213. Therefore, even when the sealing body 22 has a flat plate shape during the manufacture of the electrolytic capacitor 1, the sealing body 22 is stably arranged at a position in the depth direction of the housing 21 where the horizontal dimension between the inclined surfaces 2121 in the tapered shape of the housing 21 is the same as the horizontal dimension of the sealing body 22. Thus, the positioning of the sealing body 22 with respect to the housing 21 can be easily and surely performed. Thereby, when welding the butting portion between the housing 21 and the sealing body 22, the quality of the welding is improved. As a result, the sealing property between the housing 21 and the sealing body 22 can be improved.

[0016] An example of the sealing body 22 in the electrolytic capacitor 1 according to the second embodiment of the present disclosure is shown in FIG. 9. An example of the electrolytic capacitor 1 according to the second embodiment of the present disclosure is shown in FIG. 10.

[0017] The sealing body 22 of the electrolytic capacitor 1 according to the second embodiment has a plate-like central portion 221 and an outer edge portion 222. The outer edge portion 222 is provided on the outer periphery of the central portion 221 and has a shape that extends along the inner surface of the side surface portion 212 toward the opening 211.

[0018] In the second embodiment, the electrolytic capacitor 1 has a sealing body 22 that extends upward and has an outer edge portion 222 on its outer circumference with a large height dimension. Therefore, when manufacturing the electrolytic capacitor 1, even if the housing 21 is columnar in shape with a constant horizontal dimension between the side portion 212 from the opening 211 to the bottom portion 213, the contact area with the housing 21 is increased, so the sealing body 22 is stably positioned in a predetermined position in the depth direction of the housing 21. In this way, the positioning of the sealing body 22 relative to the housing 21 can be easily and reliably performed. This improves the quality of the welding when welding the butt joint between the housing 21 and the sealing body 22. As a result, the sealing performance between the housing 21 and the sealing body 22 can be improved. Furthermore, according to the electrolytic capacitor 1 of the second embodiment, it becomes easy to set a jig inside the outer edge 222 of the sealing body 22 to push the outer edge 222, such as having an inverted T-shaped cross-section, outward, so that the outer edge 222 of the sealing body 22 can be pressed toward the side surface 212 of the housing 21. As a result, the clearance between the housing 21 and the sealing body 22 can be minimized, and as a result, the sealing performance between the housing 21 and the sealing body 22 can be further improved.

[0019] An example of an electrolytic capacitor 1 according to the third embodiment of this disclosure is shown in Figure 11.

[0020] In the third embodiment, the electrolytic capacitor 1 has a housing 21 which is the housing 21 in the first embodiment, and a sealing body 22 which is the sealing body 22 in the second embodiment.

[0021] In other words, the electrolytic capacitor 1 of the third embodiment has a housing 21 in which the side portion 212 includes an inclined surface 2121 that slopes such that the area of ​​the inner region of the side portion 212 in a cross section parallel to the bottom portion 213 decreases from the opening 211 toward the bottom portion 213, and a sealing body 22 having a plate-shaped central portion 221 and an outer edge portion 222, the outer edge portion 222 being provided on the outer circumference of the central portion 221 and having a shape that extends toward the opening 211 along the inner surface of the side portion 212.

[0022] In the third embodiment, the electrolytic capacitor 1 has a housing 21 that has a tapered shape that narrows from the opening 211 towards the bottom surface 213, and the sealing body 22 has an outer edge 222 that extends upward and has a large height dimension on its outer circumference. Therefore, when manufacturing the electrolytic capacitor 1, the sealing body 22 is positioned in the depth direction of the housing 21 at a position where the horizontal dimension between the inclined surfaces 2121 of the tapered shape of the housing 21 is the same as the horizontal dimension of the sealing body 22. Because the height dimension of the outer edge 222 is large, the contact area between the housing 21 and the sealing body 22 is increased, allowing for more stable positioning. In this way, the positioning of the sealing body 22 relative to the housing 21 can be performed more easily and reliably. As a result, the quality of the welding is improved when welding the butt joint between the housing 21 and the sealing body 22. Consequently, the sealing performance between the housing 21 and the sealing body 22 can be further improved.

[0023] As described above, the electrolytic capacitor 1 of the first to third embodiments can improve the sealing performance between the housing 21 and the sealing body 22.

[0024] (2) Details <Electrolytic Capacitor> The configuration of the electrolytic capacitor 1 in the first to third embodiments will be described in more detail below. In these embodiments, as a representative example, the electrolytic capacitor 1 will be described as a hybrid type electrolytic capacitor 1 that includes both a solid electrolyte such as a conductive polymer and a liquid component such as an electrolyte solution as the electrolyte.

[0025] [First Embodiment] The electrolytic capacitor 1 of the first embodiment comprises a capacitor element 10 and a case 20, as shown in Figures 4 to 8. The capacitor element 10 is impregnated with a liquid component (not shown).

[0026] [Capacitor element] The capacitor element 10 is housed in a case 20. The capacitor element 10 includes an anode portion 11A and a cathode portion 11B, for example, an anode foil containing the anode portion 11A and a cathode foil containing the cathode portion 11B. A separator is placed between the anode foil and the cathode foil, and a conductive polymer as a solid electrolyte is also placed between them. Examples of conductive polymers include polypyrrole, polythiophene, poly(3,4-ethylenedioxythiophene) (PEDOT), and polyaniline. Examples of separator materials include cellulose, polyethylene terephthalate (PET), vinylon, and aramid fibers. The separator may be formed by sandwiching sheets between the anode foil and the cathode foil, or by folding a long sheet in a zigzag pattern between the anode foil and the cathode foil. The separator can hold an electrolyte such as an electrolyte solution or a conductive polymer by impregnation.

[0027] The anode foil includes a metal foil containing a valve-acting metal such as aluminum, tantalum, or niobium, and a dielectric layer formed on the surface of this metal foil. The cathode foil is a metal foil containing a valve-acting metal such as aluminum, tantalum, or niobium.

[0028] As shown in Figures 5 to 8, the electrolytic capacitor 1 includes a multilayer capacitor element 10 as the capacitor element 10. The multilayer capacitor element 10 is such that, for example, an anode foil, a cathode foil, and a separator are stacked in the direction from the bottom surface 213 of the housing 21 toward the opening 211.

[0029] The anode portion 11A of the capacitor element 10 is joined to the anode terminal portion 31A of the terminal portion 31, which will be described later. The cathode portion 11B of the capacitor element 10 is joined to the cathode terminal portion 31B. "Joining" means joining two components together. As joining methods, for example, laser welding, ultrasonic welding, resistance welding, etc., can be used. Through these joining methods, the anode terminal portion 31A and the anode portion 11A can be connected electrically and mechanically, and the cathode terminal portion 31B and the cathode portion 11B can be connected electrically and mechanically.

[0030] [case] The case 20 houses the capacitor element 10 and a liquid component (not shown). The case 20 has a housing 21 and a sealing body 22.

[0031] (Enclosure) The housing 21 is a component having an opening 211.

[0032] In the electrolytic capacitor 1 of the first embodiment, as shown in Figures 1 and 2, the housing 21 includes an inclined surface 2121 on the side portion 212 such that the area of ​​the region inside the side portion 212 in a cross section parallel to the bottom portion 213 decreases from the opening 211 toward the bottom portion 213.

[0033] The inclination angle of the inclined surface 2121 with respect to the direction perpendicular to the bottom surface 213 is preferably 0.5° or more, more preferably 1° or more, and even more preferably 3° or more. The above inclination angle is preferably 10° or less, more preferably 8° or less, and even more preferably 6° or less. In this case, the sealing body 22 is more stably positioned relative to the housing 21, thereby improving the sealing performance between the housing 21 and the sealing body 22 in the electrolytic capacitor 1.

[0034] Furthermore, as shown in Figure 2, the side portion 212 may further include a non-inclined surface 2122 parallel to the direction perpendicular to the bottom portion 213, between the opening 211 and the inclined surface 2121, such that the area of ​​the inner region of the side portion in a cross-section parallel to the bottom portion 213 is constant. In this case, the sealing body 22 is more stably positioned near the boundary between the inclined surface 2121 and the non-inclined surface 2122 in the housing 21, making it easier and more reliable to position the sealing body 22 relative to the housing 21. This improves the quality of the weld when welding the butt joint between the housing 21 and the sealing body 22, and further improves the sealing performance between the housing 21 and the sealing body 22.

[0035] In the housing 21 shown in Figure 1, the side portion 212 is composed of an inclined surface 2121. In the housing 21 shown in Figure 2, the side portion 212 is composed of a non-inclined surface 2122 and an inclined surface 2121, extending from the opening 211 toward the bottom portion 213.

[0036] The material of the housing 21 is usually metal, and for example, aluminum, stainless steel, copper, iron, brass, or alloys thereof can be used.

[0037] (sealing body) The sealing body 22 is a component that closes the opening 211 of the housing 21.

[0038] As shown in Figure 3, in the electrolytic capacitor 1 of the first embodiment, the sealing body 22 is a flat plate shape with substantially uniform thickness (hereinafter also referred to as "flat plate sealing body (P)"). The sealing body 22 includes a terminal portion 31, a frame portion 32, and a sealing portion 33. The outer edge portion 222 of the sealing body 22 may include an inclined surface 2221 that slopes such that the area of ​​the sealing body 22 in a cross-section parallel to the central portion 221 decreases from the upper surface of the central portion 221 toward the bottom surface portion 213 of the housing 21.

[0039] The electrolytic capacitor 1 shown in Figure 6 has a housing 21 which is the housing 21 shown in Figure 1, and a flat plate-shaped sealing body (P) 22. The sealing body 22 in Figure 6 includes an outer edge portion 222 which has an inclined surface 2221 such that the area of ​​the sealing body 22 in a cross-section parallel to the central portion 221 decreases from the top surface of the central portion 221 toward the bottom portion 213 of the housing 21.

[0040] The electrolytic capacitor 1 shown in Figure 7 has a housing 21 which is the same as the housing 21 shown in Figure 1, and a flat plate-shaped sealing body (P) 22. Note that the sealing body 22 in Figure 7 has outer peripheral sides parallel to the direction perpendicular to the central portion 221, and does not include an inclined surface 2221 such that the area of ​​the sealing body 22 in a cross-section parallel to the central portion 221 decreases from the top surface of the central portion 221 toward the bottom surface 213 of the housing 21.

[0041] The electrolytic capacitor 1 shown in Figure 8 has a housing 21 which is the same as the housing 21 shown in Figure 2, and a flat plate-shaped sealing body (P) 22. Note that the sealing body 22 in Figure 8 has outer peripheral sides parallel to the direction perpendicular to the central portion 221, and does not include an inclined surface 2221 which slopes so that the area of ​​the sealing body 22 in a cross-section parallel to the central portion 221 decreases from the top surface of the central portion 221 toward the bottom surface 213 of the housing 21.

[0042] (terminal part) The terminal portion 31 consists of an anode terminal portion 31A and a cathode terminal portion 31B, and a part of its surface is exposed to the outside of the case 20, thus it is a current collector. This current collector is joined to a circuit board on which the electrolytic capacitor 1 is mounted using solder or the like. The material of the terminal portion 31 is usually metal, and for example, aluminum, stainless steel, copper, iron, brass, or alloys thereof can be used.

[0043] The terminal portions 31A and 31B are preferably shaped to include a connection plane with the mounting substrate, such as a simple flat plate shape or an L-shaped plate shape.

[0044] As shown in Figures 6 to 8, the terminals 31A and 31B typically protrude from the sealing body 22 toward the interior of the housing 21. The anode terminal 31A is joined to the anode portion 11A of the capacitor element 10 and is electrically connected to the anode foil via the anode portion 11A. The cathode terminal 31B is joined to the cathode portion 11B of the capacitor element 10 and is electrically connected to the cathode foil via the cathode portion 11B.

[0045] To improve solderability, it is preferable to create irregularities on the mounting surfaces of terminals 31A and 31B by processing such as roughening or regularly forming recesses. Examples of these irregularities include striped, grid-like, and dot-like shapes. The size of these irregularities is, for example, approximately 100 μm to 5 mm. The deformation that occurs during bonding with the anode foil and cathode foil can also be used to form these irregularities.

[0046] (Frame section) The frame portion 32 is a component that surrounds the terminal portion 31. In other words, the frame portion 32 is arranged around the terminal portion 31 via the sealing portion 33, and is usually arranged around the entire outer edge of the sealing body 22.

[0047] The material of the frame portion 32 is not particularly limited, but for example, it can be metal, and examples of metals that can be used include aluminum, stainless steel, copper, iron, brass, and alloys thereof.

[0048] (Sealing part) The sealing portion 33 is a component that fills the gap between the terminal portion 31 and the frame portion 32. In other words, the sealing portion 33 is formed so that there are no gaps between the anode terminal portion 31A and the cathode terminal portion 31B, between the anode terminal portion 31A and the frame portion 32, and between the cathode terminal portion 31B and the frame portion 32. The sealing portion 33 is formed to ensure high adhesion between the frame portion 32 and the sealing portion 33, and between the terminal portion 31 and the sealing portion 33.

[0049] The material of the sealing portion 33 is not particularly limited, but from the viewpoint of being able to be injection molded, a thermoplastic resin can be used, for example. Among these, polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS) is preferred. These resins have particularly low gas permeability, which can further improve the airtightness of the electrolytic capacitor 1, and also have high heat resistance, which further improves reliability in high-temperature environments.

[0050] In the sealing body 22, it is preferable that the surface of the terminal portion 31 that contacts the sealing portion 33 and the surface of the frame portion 32 that contacts the sealing portion 33 are surface-treated surfaces. In other words, it is preferable to surface-treat the outer surface of the terminal portion 31 and the inner circumferential surface of the frame portion 32 when manufacturing the sealing body 22. This improves the adhesion between the terminal portion 31 and the sealing portion 33 and between the frame portion 32 and the sealing portion 33, and as a result, the airtightness of the electrolytic capacitor 1 can be further improved.

[0051] Surface treatments include, for example, chemical surface treatment, roughening treatment, or both. Chemical surface treatment methods include, for example, immersion in a chemical conversion solution such as ammonium adipate solution followed by heat treatment, or immersion in a chemical conversion solution followed by the application of a voltage, thereby forming a chemical conversion film. Roughening treatment can be performed by etching, which can be carried out by, for example, DC electrolysis or AC electrolysis.

[0052] Preferably, the sealing body 22 is joined to the opening 211 of the housing 21, thereby sealing the opening 211. By joining the sealing body 22 to the housing 21 in this way and sealing the opening 211, the gap between the housing 21 and the sealing body 22 can be further reduced, and as a result, the sealing performance between the housing 21 and the sealing body 22 in the electrolytic capacitor 1 can be further improved. From the viewpoint of further improving sealing performance, this joining is preferably done by welding.

[0053] Furthermore, as shown in Figures 6 to 8, the sealing portion 33 of the sealing body 22 protrudes into the interior of the housing 21 relative to the frame portion 32, and the sealing portion 33 may be fitted into the opening 211 of the housing 21. With this structure, the sealing portion 33, which is formed to be thicker than the frame portion 32, matches the inner dimensions of the housing 21, making it easy to align the frame portion 32 of the sealing body 22 with the end of the opening 211 of the housing 21. Therefore, by subsequently performing welding, the gap between the housing 21 and the sealing body 22 can be further reduced, and the sealing performance between the housing 21 and the sealing body 22 in the electrolytic capacitor 1 can be further improved.

[0054] Preferably, the sealing body 22 is formed by injection molding (insert molding) a sealing portion 33 to the terminal portion 31 and the frame portion 32. By using an insert molded product as the sealing body 22 in this way, the airtightness between the terminal portion 31 and the sealing portion 33 and between the frame portion 32 and the sealing portion 33 can be further improved, and as a result, the airtightness of the electrolytic capacitor 1 can be further improved.

[0055] (Liquid component) The liquid component is impregnated into the capacitor element 10. As a result, the liquid component is contained within the case 20. More specifically, it is impregnated into the separator 13 of the capacitor element 10, etc.

[0056] Examples of liquid components include electrolytes.

[0057] For the electrolyte, an organic solvent is used, for example. Examples of organic solvents include polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, and propylene glycol; sulfone compounds such as sulfolane, dimethyl sulfoxide, and diethyl sulfoxide; lactone compounds such as γ-butyrolactone and γ-valerolactone; carbonate compounds such as dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, propylene carbonate, and fluoroethylene carbonate; diether compounds of polyhydric alcohols such as ethylene glycol dimethyl ether and diethylene glycol dimethyl ether; and monohydric alcohols such as methanol, ethanol, and propanol.

[0058] The electrolyte may contain a solute. Examples of solutes include acidic components such as organic acids, inorganic acids, and complex acid compounds of organic and inorganic acids; basic components such as amines and quaternary ammonium salts; and salts composed of acids and bases, nitro compounds, phenolic compounds, etc.

[0059] [Second Embodiment] As shown in Figures 9 and 10, the electrolytic capacitor 1 of the second embodiment differs from the electrolytic capacitor 1 of the first embodiment in the shape of the housing 21 and the sealing body 22, but is otherwise the same. The descriptions of the similar components will be omitted below, and the differing components will be described in detail.

[0060] (Enclosure) In the electrolytic capacitor 1 of the second embodiment, the shape of the housing 21 is typically a bottomed rectangular tube shape with an opening on one face of a hollow cube or rectangular parallelepiped (hereinafter also referred to as "cylindrical housing (Q)"). In the housing 21, the side portion 212 is parallel to the direction perpendicular to the bottom portion 213, and the side portion 212 does not include an inclined surface 2121 such that the area of ​​the region inside the side portion 212 in a cross section parallel to the bottom portion 213 decreases from the opening 211 toward the bottom portion 213.

[0061] (sealing body) In the electrolytic capacitor 1 of the second embodiment, the sealing body 22 has a plate-shaped central portion 221 and an outer edge portion 222. The outer edge portion 222 is provided on the outer circumference of the central portion 221 and has a shape that extends toward the opening 211 along the inner surface of the side portion 212 of the housing 21.

[0062] In the electrolytic capacitor 1 of the second embodiment, as shown in Figure 9, typically the terminal portions 31A and 31B and the sealing portion 33 of the sealing body 22 constitute the central portion 221, and the outer peripheral portion of the frame portion 32 constitutes the outer edge portion 222.

[0063] The sealing body 22 shown in Figure 9 is formed by processing the frame portion 32 to have a concave cross-sectional shape, thereby creating an outer edge portion 222 that extends toward the opening 211 along the inner surface of the side portion 212 of the housing 21.

[0064] The outer edge portion 222 may include an inclined surface 2221 that slopes such that the area of ​​the sealing body 22 in a cross-section parallel to the central portion 221 decreases from the upper surface of the central portion 221 toward the bottom surface portion 213 of the housing 21. The inclination angle of the inclined surface 2221 with respect to the direction perpendicular to the central portion 221 is preferably 0.5° or more, more preferably 1° or more, and even more preferably 3° or more. The above inclination angle is preferably 10° or less, more preferably 8° or less, and even more preferably 6° or less. In this case, the sealing body 22 is more stably positioned relative to the housing 21, thereby improving the sealing performance between the housing 21 and the sealing body 22 in the electrolytic capacitor 1.

[0065] Furthermore, the outer edge portion 222 may include a non-inclined surface 2222 in which the direction in which the outer edge portion 222 extends is perpendicular to the central portion 221.

[0066] The outer edge portion 222 may extend higher than the central portion 221 in a direction perpendicular to the central portion 221. The difference between the length of the outer edge portion 222 in the direction perpendicular to the central portion 221 and the thickness of the central portion 221, i.e., the difference in thickness between the outer edge portion 222 and the central portion 221, is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 mm or more. In this case, the sealing body 22 is positioned more stably with respect to the side portion 212 of the housing 21, so that the positioning of the sealing body 22 with respect to the housing 21 can be performed more easily and reliably. This improves the quality of the welding when welding the butt joint portion between the housing 21 and the sealing body 22, and improves the sealing performance between the housing 21 and the sealing body 22. The upper limit of the above difference is not particularly limited, but for example, it is 1 mm or less. The length of the outer edge portion 222 in the direction perpendicular to the central portion 221 and the thickness of the central portion 221 may be the same.

[0067] The electrolytic capacitor 1 shown in Figure 10 has a cylindrical housing (Q) as its casing 21, and the sealing body 22 is the same as the sealing body 22 shown in Figure 9.

[0068] [Third Embodiment] In the third embodiment, the electrolytic capacitor 1 has a housing 21 which is the housing 21 in the first embodiment, and a sealing body 22 which is the sealing body 22 in the second embodiment.

[0069] In the electrolytic capacitor 1 of the third embodiment, as shown in Figure 11, the side portion 212 of the housing 21 includes a contact region that abuts against the outer edge portion 222 of the sealing body 22.

[0070] It is preferable that the housing 21 and the sealing body 22 are laser-welded in the aforementioned contact area. Laser welding in the contact area can further improve the sealing performance between the housing 21 and the sealing body 22 in the electrolytic capacitor 1.

[0071] The outer edge portion 222 of the sealing body 22 may include an inclined surface 2221 that slopes such that the area of ​​the sealing body 22 in a cross-section parallel to the central portion 221 decreases from the upper surface of the central portion 221 toward the bottom portion 213 of the housing 21, as shown in Figure 11.

[0072] The absolute value of the difference between the inclination angle of the inclined surface 2121 of the housing 21 with respect to the direction perpendicular to the bottom surface 213 and the inclined surface 2221 of the outer edge 222 of the sealing body 22 with respect to the direction perpendicular to the central part 221 is preferably 60° or less, more preferably 30° or less, and even more preferably 10° or less. In this case, the sealing body 22 is more stably positioned relative to the housing 21, thereby further improving the sealing performance between the housing 21 and the sealing body 22 in the electrolytic capacitor 1. The absolute value of the above difference may be 0°.

[0073] (modified version) The above embodiments are merely one of many embodiments of this disclosure. The above embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure are achieved. The following are some modifications of these embodiments. These modifications may be implemented in combination as appropriate.

[0074] In the above embodiment, the electrolytic capacitor 1 is a hybrid type electrolytic capacitor 1 that includes both a solid electrolyte and a liquid component as the electrolyte, but it is not limited to this, and the electrolytic capacitor 1 may include only one of either a solid electrolyte or a liquid component.

[0075] In the above embodiment, the shape of the housing 21 was a bottomed rectangular tube shape as shown in Figures 1 and 2, but it is not limited to this, and other shapes such as a bottomed cylindrical shape can be used depending on the location where the electrolytic capacitor 1 is mounted, etc.

[0076] In the above embodiment, a multilayer capacitor element 10 was used as the capacitor element 10, but it is not limited to this, and other types of capacitor elements 10, such as wound capacitor elements, can also be used. The wound capacitor element 10 includes an anode foil, a cathode foil, a separator, and a conductive polymer, with the anode foil, cathode foil, and separator wound together. The direction of this winding axis is, for example, a direction that intersects the direction from the bottom surface 213 of the housing 21 toward the opening 211.

[0077] <Manufacturing method for electrolytic capacitors> The electrolytic capacitor 1 of this embodiment can be manufactured simply and reliably by a manufacturing method comprising, for example, a preparation step, a bonding step, a placement step, and a sealing step. When manufacturing an electrolytic capacitor 1 having an electrolyte solution inside, this manufacturing method may include an impregnation step before the sealing step. Each step will be described below.

[0078] [Preparation process] In this step, the capacitor element 10, the housing 21, and the sealing body 22 are prepared. The housing 21 is the housing 21 of the first embodiment. The sealing body 22 is the sealing body 22 of the first embodiment.

[0079] The sealing body 22 includes a terminal portion 31, a frame portion 32, and a sealing portion 33. The capacitor element 10 includes an anode portion 11A and a cathode portion 11B. The housing 21 has an opening 211. The terminal portion 31 consists of an anode terminal portion 31A and a cathode terminal portion 31B, the frame portion 32 surrounds the terminal portion 31, and the sealing portion 33 fills the space between the terminal portion 31 and the frame portion 32. The capacitor element 10 can be either a multilayer type or a wound type.

[0080] The sealing body 22 is preferably formed by injection molding a sealing portion 33 to the terminal portion 31 and the frame portion 32. In other words, it is preferable to place the terminal portion 31 and the frame portion 32 in a mold and inject a resin to form the sealing portion 33 to perform insert molding.

[0081] When performing injection molding in this manner, it is preferable to apply at least one of chemical surface treatment and surface roughening treatment to the surfaces of the terminal portion 31 and the frame portion 32 that come into contact with the sealing portion 33 beforehand. By performing such chemical surface treatment and surface roughening treatment on the surfaces of the terminal portion 31 and the frame portion 32 that come into contact with the sealing portion 33 by injection molding using the method described above, the adhesion between the terminal portion 31 and the sealing portion 33 and between the frame portion 32 and the sealing portion 33 can be further improved, and as a result, the sealing performance of the electrolytic capacitor 1 can be further improved.

[0082] [Joining process] In this process, the anode terminal portion 31A of the sealing body 22 is joined to the anode portion 11A of the capacitor element 10, and the cathode terminal portion 31B of the sealing body 22 is joined to the cathode portion 11B of the capacitor element 10.

[0083] Examples of joining methods include welding techniques such as laser welding, ultrasonic welding, and resistance welding.

[0084] The joining is preferably performed by laser welding. Laser welding allows for batch welding. First, multiple sets (e.g., 30 sets) of anode foil, separator, and cathode foil are stacked on top of the anode terminal section 31A and cathode terminal section 31B. Next, the uppermost anode foil and cathode foil are irradiated with a laser, allowing for batch welding. This method allows for easy joining of the anode terminal section 31A and the anode section 11A, and the cathode terminal section 31B and the cathode section 11B. Furthermore, the anode sections 11A of multiple anode foils and the cathode sections 11B of multiple cathode foils can be joined simultaneously. Since welding eliminates interface resistance, this contributes to lowering the resistance of the terminal section 31 compared to conventional crimping methods. It also shortens the manufacturing cycle time.

[0085] [Placement process] In this step, the sealing body 22, to which the capacitor elements 10 obtained in the bonding step are bonded, is positioned so as to house the capacitor elements 10 inside the housing 21 and to close the opening 211 of the housing 21.

[0086] The housing 21 is the housing 21 from the first embodiment. Also, since the sealing body 22 from the first embodiment is used as the sealing body 22, as described above, the alignment of the frame portion 32, which is the outer edge portion 222 of the sealing body 22, and the side portion 212 of the housing 21 can be easily performed.

[0087] [Impregnation process] In this step, the electrolyte is impregnated into the capacitor element 10. This step may also be performed by introducing the electrolyte into the housing 21 in which the capacitor element 10 is housed. Specifically, the electrolyte is impregnated into the separator of the capacitor element 10. Note that the impregnation step may be performed before the placement step. In this case, the electrolyte is impregnated into the capacitor element 10 by immersing the capacitor element 10 in the electrolyte, etc.

[0088] [Sealing process] In this process, the opening 211 is sealed by welding the sealing body 22 to the side portion 212 of the housing 21.

[0089] This process can be carried out by welding the metal of the frame portion 32 and the metal of the side portion 212 of the housing 21 when both the frame portion 32 and the housing 21 of the sealing body 22 are made of metal.

[0090] As described above, an electrolytic capacitor 1 with improved sealing performance between the housing 21 and the sealing body 22 can be manufactured simply and reliably.

[0091] (summary) As will be apparent from the above embodiments and modifications, this disclosure includes the following aspects. In the following, reference numerals are enclosed in parentheses solely to indicate their correspondence with the embodiments.

[0092] The electrolytic capacitor (1) of the first embodiment comprises a capacitor element (10) including an anode portion (11A) and a cathode portion (11B), and a case (20) housing the capacitor element (10). The case (20) has a housing (21) having an opening (211) and a sealing body (22) that closes the opening (211) of the housing (21). The sealing body (22) includes a terminal portion (31) consisting of an anode terminal portion (31A) and a cathode terminal portion (31B), a frame portion (32) surrounding the terminal portion (31), and a sealing portion (33) filling the space between the terminal portion (31) and the frame portion (32). The anode portion (11A) of the capacitor element (10) is joined to the anode terminal portion (31A). The cathode portion (11B) of the capacitor element (10) is joined to the cathode terminal portion (31B). The housing (21) has a bottom portion (213) located on the opposite side of the opening (211), and a side portion (212) that extends from the outer circumference of the bottom portion (213) toward the opening (211) and encloses the internal space of the housing (21). The side portion (212) includes an inclined surface (2121) such that the area of ​​the region inside the side portion (212) in a cross-section parallel to the bottom portion (213) decreases toward the bottom portion (213) from the opening (211).

[0093] According to the first embodiment, the electrolytic capacitor (1) can improve the sealing performance between the housing (21) and the sealing body (22).

[0094] In the electrolytic capacitor (1) of the second embodiment, the side portion (212) further includes a non-inclined surface (2122) between the opening (211) and the inclined surface (2121) that is parallel to the direction perpendicular to the bottom portion (213) such that the area of ​​the above region is constant.

[0095] According to the second embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22).

[0096] In the electrolytic capacitor (1) of the third embodiment, in the first or second embodiment, the inclination angle of the inclined surface (2121) with respect to the direction perpendicular to the bottom surface (213) is 0.5° or more and 10° or less.

[0097] According to the third embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22).

[0098] The electrolytic capacitor (1) of the fourth embodiment comprises a capacitor element (10) including an anode portion (11A) and a cathode portion (11B), and a case (20) housing the capacitor element (10). The case (20) has a housing (21) having an opening (211) and a sealing body (22) that closes the opening (211) of the housing (21). The sealing body (22) includes a terminal portion (31) consisting of an anode terminal portion (31A) and a cathode terminal portion (31B), a frame portion (32) surrounding the terminal portion (31), and a sealing portion (33) filling the space between the terminal portion (31) and the frame portion (32). The anode portion (11A) of the capacitor element (10) is joined to the anode terminal portion (31A). The cathode portion (11B) of the capacitor element (10) is joined to the cathode terminal portion (31B). The housing (21) has a bottom portion (213) located on the opposite side of the opening (211), and a side portion (212) that extends from the outer circumference of the bottom portion (213) toward the opening (211) and surrounds the internal space of the housing (21). The sealing body (22) has a plate-shaped central portion (221) and an outer edge portion (222) provided on the outer circumference of the central portion (221) and extending toward the opening (211) along the inner surface of the side portion (212).

[0099] According to the fourth embodiment, the electrolytic capacitor (1) can improve the sealing performance between the housing (21) and the sealing body (22).

[0100] In the electrolytic capacitor (1) of the fifth embodiment, as in the fourth embodiment, the outer edge (222) includes an inclined surface (2221) such that the area of ​​the sealing body (22) in a cross section parallel to the central portion (221) decreases from the top surface of the central portion (221) toward the bottom surface (213).

[0101] According to the fifth embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22).

[0102] In the electrolytic capacitor (1) of the sixth embodiment, the inclination angle of the inclined surface (2221) with respect to the direction perpendicular to the central portion (221) is 0.5° or more and 10° or less, as in the fifth embodiment.

[0103] According to the sixth embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22) by setting the tilt angle within the above range.

[0104] In the electrolytic capacitor (1) of the seventh embodiment, the outer edge (222) includes a non-inclined surface (2222) in which the direction in which the outer edge (222) extends is parallel to the direction perpendicular to the central portion (221).

[0105] According to the seventh embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22).

[0106] In the electrolytic capacitor (1) of the eighth embodiment, in any one of the fourth to seventh embodiments, the difference between the length of the outer edge (222) in the direction perpendicular to the central part (221) and the thickness of the central part (221) is 0.1 mm or more.

[0107] According to the eighth aspect, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22).

[0108] An electrolytic capacitor (1) in the ninth embodiment comprises a capacitor element (10) including an anode portion (11A) and a cathode portion (11B), and a case (20) housing the capacitor element (10). The case (20) has a housing (21) having an opening (211) and a sealing body (22) that closes the opening (211) of the housing (21). The sealing body (22) includes a terminal portion (31) consisting of an anode terminal portion (31A) and a cathode terminal portion (31B), a frame portion (32) surrounding the terminal portion (31), and a sealing portion (33) filling the space between the terminal portion (31) and the frame portion (32). The anode portion (11A) of the capacitor element (10) is joined to the anode terminal portion (31A). The cathode portion (11B) of the capacitor element (10) is joined to the cathode terminal portion (31B). The housing (21) has a bottom portion (213) located on the opposite side of the opening (211), and a side portion (212) that extends from the outer circumference of the bottom portion (213) toward the opening (211) and encloses the internal space of the housing (21). The side portion (212) includes an inclined surface (2121) such that the area of ​​the region inside the side portion (212) in a cross-section parallel to the bottom portion (213) decreases toward the bottom portion (213) from the opening (211). The sealing body (22) has a plate-shaped central portion (221) and an outer edge portion (222) provided on the outer circumference of the central portion (221) and extending toward the opening (211) along the inner surface of the side portion (212).

[0109] According to the ninth aspect, the electrolytic capacitor (1) can improve the sealing performance between the housing (21) and the sealing body (22).

[0110] In the electrolytic capacitor (1) of the tenth embodiment, in the ninth embodiment, the side portion (212) of the housing (21) includes a contact region that abuts against the outer edge portion (222) of the sealing body (22).

[0111] According to the tenth embodiment, the electrolytic capacitor (1) can be made to include a contact area, thereby further improving the sealing performance between the housing (21) and the sealing body (22).

[0112] In the electrolytic capacitor (1) of the eleventh embodiment, the housing (21) and the sealing body (22) are laser-welded in the contact area as in the tenth embodiment.

[0113] According to the eleventh embodiment, the electrolytic capacitor (1) is laser-welded in the contact area, which further improves the sealing performance between the housing (21) and the sealing body (22).

[0114] In the electrolytic capacitor (1) of the twelfth embodiment, in any one embodiment from the ninth to the eleventh, the outer edge (222) includes an inclined surface (2221) such that the area of ​​the sealing body (22) in a cross-section parallel to the central portion (221) decreases from the top surface of the central portion (221) toward the bottom surface (213).

[0115] According to the twelfth embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22).

[0116] In the electrolytic capacitor (1) of the 13th embodiment, as in the 12th embodiment, the absolute value of the difference between the inclination angle of the inclined surface (2121) of the housing (21) with respect to the direction perpendicular to the bottom surface (213) and the inclination angle of the inclined surface (2221) of the outer edge (222) of the sealing body (22) with respect to the direction perpendicular to the central part (221) is 60° or less.

[0117] According to the 13th embodiment, the electrolytic capacitor (1) can further improve the sealing performance between the housing (21) and the sealing body (22) by setting the absolute value of the difference in tilt angle to the above range.

[0118] In the electrolytic capacitor (1) of the 14th embodiment, in any one of the first to 13 embodiments, the capacitor element (10) includes an anode foil including an anode portion (11A), a cathode foil including a cathode portion (11B), a separator and a conductive polymer disposed between the anode foil and the cathode foil. Within the case (20), the anode foil, the cathode foil and the separator are stacked in a direction from the opening (211) of the housing (21) toward the bottom surface (213).

[0119] According to the 14th embodiment, the electrolytic capacitor (1) can improve the sealing performance between the housing (21) and the sealing body (22), even when the capacitor element (10) is of the multilayer type.

[0120] In the electrolytic capacitor (1) of the 15th embodiment, in any one of the first to 13 embodiments, the capacitor element (10) includes an anode foil including an anode portion (11A), a cathode foil including a cathode portion (11B), a separator and a conductive polymer disposed between the anode foil and the cathode foil. The anode foil, the cathode foil and the separator are wound together.

[0121] According to the 15th embodiment, the electrolytic capacitor (1) can improve the sealing performance between the housing (21) and the sealing body (22) even when the capacitor element (10) is of the wound type.

[0122] In the electrolytic capacitor (1) of the 16th embodiment, in any one of the first to 15 embodiments, the capacitor element (10) is impregnated with a liquid component.

[0123] According to the 16th embodiment, the electrolytic capacitor (1) has improved sealing performance between the housing (21) and the sealing body (22), so that the decrease in liquid components contained inside over time can be suppressed. [Explanation of symbols]

[0124] 1 Electrolytic capacitor 10 Capacitor element 11A Anode part 11B Cathode section 20 cases 21 cabinets 211 Aperture 212 Side part 2121 Slope 2122 Non-inclined surface 213 Bottom part 22 Sealing body 221 Central part 222 Outer edge 2221 Slope 2222 Non-inclined surface 31 Terminal section 31A Anode terminal section 31B Cathode terminal 32 Frame section 33 Sealing part

Claims

1. A capacitor element including an anode and a cathode, The capacitor element is housed in a case, The case comprises a housing having an opening and a sealing body that closes the opening of the housing. The sealing body includes a terminal portion consisting of an anode terminal portion and a cathode terminal portion, a frame portion surrounding the terminal portion, and a sealing portion filling the space between the terminal portion and the frame portion. The anode portion of the capacitor element is joined to the anode terminal portion. The cathode portion of the capacitor element is joined to the cathode terminal portion. The housing has a bottom portion located on the opposite side of the opening, and a side portion extending from the outer circumference of the bottom portion toward the opening and enclosing the internal space of the housing. An electrolytic capacitor in which the side portion includes an inclined surface such that the area of ​​the region inside the side portion in a cross-section parallel to the bottom portion decreases toward the bottom portion from the opening.

2. The electrolytic capacitor according to claim 1, wherein the side portion further includes a non-inclined surface parallel to the direction perpendicular to the bottom surface between the opening and the inclined surface such that the area of ​​the region is constant.

3. The electrolytic capacitor according to claim 1 or 2, wherein the inclination angle of the inclined surface with respect to the direction perpendicular to the bottom surface is 0.5° or more and 10° or less.

4. A capacitor element including an anode and a cathode, The capacitor element is housed in a case, The case comprises a housing having an opening and a sealing body that closes the opening of the housing. The sealing body includes a terminal portion consisting of an anode terminal portion and a cathode terminal portion, a frame portion surrounding the terminal portion, and a sealing portion filling the space between the terminal portion and the frame portion. The anode portion of the capacitor element is joined to the anode terminal portion. The cathode portion of the capacitor element is joined to the cathode terminal portion. The housing has a bottom portion located on the opposite side of the opening, and a side portion extending from the outer circumference of the bottom portion toward the opening and enclosing the internal space of the housing. The sealing body comprises a plate-shaped central portion and an outer edge portion provided on the outer circumference of the central portion, extending toward the opening along the inner surface of the side portion, and is an electrolytic capacitor.

5. The electrolytic capacitor according to claim 4, wherein the outer edge includes an inclined surface such that the area of ​​the sealing body in a cross-section parallel to the central portion decreases from the upper surface of the central portion toward the bottom surface.

6. The electrolytic capacitor according to claim 5, wherein the inclination angle of the inclined surface with respect to the direction perpendicular to the central portion is 0.5° or more and 10° or less.

7. The electrolytic capacitor according to claim 4, wherein the outer edge includes a non-inclined surface in which the direction in which the outer edge extends is parallel to the direction perpendicular to the central portion.

8. The electrolytic capacitor according to claim 4, wherein the difference between the length of the outer edge portion perpendicular to the central portion and the thickness of the central portion is 0.1 mm or more.

9. A capacitor element including an anode and a cathode, The capacitor element is housed in a case, The case comprises a housing having an opening and a sealing body that closes the opening of the housing. The sealing body includes a terminal portion consisting of an anode terminal portion and a cathode terminal portion, a frame portion surrounding the terminal portion, and a sealing portion filling the space between the terminal portion and the frame portion. The anode portion of the capacitor element is joined to the anode terminal portion. The cathode portion of the capacitor element is joined to the cathode terminal portion. The housing has a bottom portion located on the opposite side of the opening, and a side portion extending from the outer circumference of the bottom portion toward the opening and enclosing the internal space of the housing. The side portion includes an inclined surface such that the area of ​​the inner region of the side portion in a cross-section parallel to the bottom portion decreases from the opening toward the bottom portion. The sealing body comprises a plate-shaped central portion and an outer edge portion provided on the outer circumference of the central portion, extending toward the opening along the inner surface of the side portion, and is an electrolytic capacitor.

10. The side portion of the housing includes a contact area that abuts against the outer edge of the sealing body, The electrolytic capacitor according to claim 9.

11. The housing and the sealing body are laser-welded in the contact area. The electrolytic capacitor according to claim 10.

12. The electrolytic capacitor according to claim 9 or 10, wherein the outer edge includes an inclined surface such that the area of ​​the sealing body in a cross-section parallel to the central portion decreases from the upper surface of the central portion toward the bottom surface.

13. The electrolytic capacitor according to claim 12, wherein the absolute value of the difference between the inclination angle of the inclined surface in the housing with respect to the direction perpendicular to the bottom surface and the inclination angle of the inclined surface in the outer edge of the sealing body with respect to the direction perpendicular to the central part is 60° or less.

14. The capacitor element includes an anode foil including the anode portion, a cathode foil including the cathode portion, a separator and a conductive polymer disposed between the anode foil and the cathode foil, The electrolytic capacitor according to claim 1, 4, or 9, wherein the anode foil, cathode foil, and separator are stacked within the case in a direction toward the bottom surface from the opening of the housing.

15. The capacitor element includes an anode foil including the anode portion, a cathode foil including the cathode portion, a separator and a conductive polymer disposed between the anode foil and the cathode foil, The electrolytic capacitor according to claim 1, 4, or 9, wherein the anode foil, the cathode foil, and the separator are wound together.

16. The electrolytic capacitor according to claim 1, 4, or 9, wherein the capacitor element is impregnated with a liquid component.

Images