Electrolytic capacitors

Abstract

The electrolytic capacitor comprises: a capacitor element including a pair of electrodes, an electrolyte interposed between the pair of electrodes, a pair of leads electrically connected to the pair of electrodes, a housing accommodating the capacitor element and the electrolyte and having an opening, a sealing body sealing the opening and having a pair of insertion holes for leading out the leads, an insulating plate having a pair of through holes for leading out the leads, and a resin member filled between the sealing body and the insulating plate, the insulating plate having a resin bonding surface abutting against the resin member and a mounting surface opposite to the resin bonding surface, and having at least one convex portion or concave portion on the resin bonding surface.

Description

[0001] This application is a divisional application of the application with application number: 201880056421.2, PCT application number: PCT / JP2018 / 032478, application date: August 31, 2018, invention name: "Electrolytic capacitor". Technical Field

[0002] The present invention relates to an electrolytic capacitor, and more particularly to an electrolytic capacitor having a resin member between a sealing body and a seat plate. In addition, this application claims priority based on Japanese patent applications No. 2017-167592 and No. 2017-167593 filed on August 31, 2017, and all the contents disclosed therein are incorporated herein by reference in their entirety. Background Art

[0003] Electrolytic capacitors are widely used not only as consumer equipment but also as a part of automotive circuits used under harsh conditions due to their high reliability. In particular, electrolytic capacitors used in high-temperature and high-humidity environments such as engines are required to guarantee operation under conditions of, for example, approximately 150°C for several thousand hours.

[0004] A typical electrolytic capacitor comprises a capacitor element including a pair of electrodes, an electrolyte disposed therebetween, a housing containing the capacitor element and the electrolyte and having an opening, a sealing body made of butyl rubber for sealing the opening, a seat plate having a pair of through holes, and a pair of leads electrically connected to the pair of electrodes and extending from the through holes, a gap being provided between the sealing body and the insulating plate, and the sealing body being substantially exposed to the outside air (high temperature and high humidity environment).

[0005] The butyl rubber contained in the seal is generally a high molecular weight polymer. If exposed to air (oxygen) or water (humidity), it will be oxidized and degraded, and the molecular chain will be cut and the molecular weight will be reduced. In addition, the seal contains carbon. If exposed to a high temperature and high humidity environment, the volume will decrease and it will be easy to break. The carbon contained in the seal will bond with each other and the conductivity of the seal will increase, causing leakage current between a pair of electrodes, and there is a risk of impairing the function as an electrolytic capacitor.

[0006] In addition, for example, the electrolytic capacitor described in patent document 1 comprises a seat plate having a sunken portion in the center for accommodating the lower part of the capacitor body; and a capacitor body, in which a capacitor element having an electrolyte is accommodated in a cylindrical metal shell closed at the top, and the opening at the bottom of the metal shell is sealed by a sealing body, and a pair of electrode terminals led downward from the capacitor element penetrate the sealing body and extend downward, and then penetrate the above-mentioned seat plate, and bend in directions of separation from each other along the bottom surface of the seat plate. It is known that in this electrolytic capacitor, the capacitor body is fixed to the seat plate by injecting an adhesive into a recessed portion that is not a sunken portion and is open at least on the side of the sunken portion and is arranged around the sunken portion of the seat plate.

[0007] The adhesive described in Patent Document 1 is injected from the concave portion of the non-sunk portion around the depressed portion of the seat plate in order to reliably fix the seat plate and the capacitor body.

[0008] In addition, for example, the chip-type capacitor described in Patent Document 2 seals the opening of the outer case with a sealing body made of elastic rubber or the like, and further performs a so-called curling process of necking the opening of the outer case and the side surfaces near the opening to seal the inside of the outer case. Patent Document 2 proposes that an insulating plate having through holes at positions corresponding to the leads is brought into contact with the end face of a capacitor from which a plurality of leads are led out from the same end face, the leads protruding from the insulating plate through the through holes are bent along the end face of the insulating plate, and a resin layer is formed in the gaps between the end face of the capacitor and the insulating plate, and between the leads of the capacitor and the through holes of the insulating plate.

[0009] The resin layer described in Patent Document 2 is formed on the end faces of the capacitor and the insulating plate, as well as in the gaps between the capacitor leads and the through holes of the insulating plate, and achieves high reliability by preventing moisture and cleaning solvents from entering between the leads and the through holes of the insulating plate to which stress is applied during the bending process.

[0010] Prior art literature

[0011] Patent Literature

[0012] Patent Document 1: Japanese Patent Application Publication No. 2000-269081

[0013] Patent Document 2: Japanese Patent Application Laid-Open No. 2-194614 Summary of the invention

[0014] Problem that the invention aims to solve

[0015] However, the adhesive described in Patent Document 1 is injected from the concave portion of the non-sunk portion around the sunken portion of the seat plate to help fix the capacitor body to the seat plate, but the rubber seal installed in the opening of the outer case is easily exposed to air (oxygen) and / or water (humidity) that penetrates into the outer case through the hole provided in the seat plate during use, and is very easy to oxidize. If the seal is oxidized, the volume is reduced and it is easy to rupture, the rubber constituting the seal is reduced in molecular weight, and the carbon contained in it is bonded to each other, which easily generates leakage current between a pair of electrode terminals.

[0016] In addition, the resin layer described in patent document 2 is formed on the end face of the capacitor and the insulating plate, as well as the gap between the lead of the capacitor and the through hole of the insulating plate, so it is also believed that the sealing body composed of elastic rubber and the like can be protected from air (oxygen) and / or moisture (water vapor) invading from the outside. However, the resin layer is composed of epoxy resin and silicone resin, which has a very different thermal expansion coefficient from the sealing body composed of elastic rubber. Therefore, due to the thermal shock accompanying long-term use, the resin layer is sometimes peeled off from the sealing body, and a gap is generated at the interface between them. If a gap is generated between the resin layer and the sealing body, the sealing body made of elastic rubber is also exposed to air (oxygen) and / or moisture (humidity) invading from the outside, and oxidation occurs, which is easy to break, and then the moisture accumulated in the gap can generate leakage current between a pair of electrode terminals.

[0017] Therefore, one embodiment of the present invention aims to provide an electrolytic capacitor, in which a resin member is filled between a sealing body and an insulating plate (seat plate) to improve the tightness between the resin member and the sealing body, reliably block air (oxygen) and / or moisture (water vapor) intruding from the outside, prevent oxidative degradation of the sealing body before it occurs, and thus achieve long-term high reliability even under severe working conditions.

[0018] Means used to solve problems

[0019] An electrolytic capacitor according to one embodiment of the present invention comprises a capacitor element including a pair of electrodes, an electrolyte interposed between the pair of electrodes, a pair of leads electrically connected to the pair of electrodes, a housing accommodating the capacitor element and the electrolyte and having an opening, a sealing body sealing the opening and having a pair of insertion holes for leading out the leads, an insulating plate having a pair of through holes for leading out the leads, and a resin member filled between the sealing body and the insulating plate, the insulating plate having a resin bonding surface abutting against the resin member and a mounting surface opposite to the resin bonding surface, and having at least one convex portion or concave portion on the resin bonding surface.

[0020] Effects of the Invention

[0021] According to an electrolytic capacitor involved in one embodiment of the present invention, a resin member is filled between the sealing body and the insulating plate (seat plate), so that the tightness between the resin member and the sealing body is improved, and air (oxygen) and / or moisture (water vapor) intruding from the outside are reliably blocked to prevent oxidation degradation of the sealing body before it occurs, thereby achieving long-term high reliability even under severe working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a partially cutaway perspective view partially showing the interior of the electrolytic capacitor according to the first embodiment of the present invention.

[0023] Figure 2 (a) to (c) are Figure 1 Top view, bottom view and side view of an electrolytic capacitor.

[0024] Figure 3 (a) is from Figure 2 (a) is a cross-sectional view of the electrolytic capacitor viewed along line III-III, and (b) is a top view of the seat plate of (a) viewed from above.

[0025] Figure 4 (a) is a cross-sectional view of another electrolytic capacitor according to the first embodiment, and (b) is a plan view of the seat plate of (a) viewed from above.

[0026] Figure 5 This is a plan view of a seat plate of another electrolytic capacitor according to the first embodiment, as seen from above.

[0027] Figure 6 is with Figure 4 (a) The same cross-sectional view shows the peripheral fixing portion communicating with the resin member of the electrolytic capacitor.

[0028] Figure 7 (a)~(d) are related to Figure 3 (b) and Figure 4 (b) The same top view shows the concave flow path (groove) formed on the resin bonding surface.

[0029] Figure 8 is from Figure 7 (a) is a cross-sectional view of an electrolytic capacitor observed along line VIII-VIII.

[0030] Fig. 9 This is a bottom view of the curled portion of the housing as viewed from below, showing four slits provided in the curled portion.

[0031] Fig.10 is with Figure 6 The same cross-sectional view shows a seat plate including a curved surface that bulges upward from the center toward the peripheral edge.

[0032] Fig.11 is with Figure 6 The same cross-sectional view shows the resin injection hole that penetrates from the resin bonding surface to the mounting surface.

[0033] Fig.12 (a) to (c) show electrolytic capacitors according to modified examples of the first embodiment. Figure 2 (a)~ Figure 2 (c) The same top view, bottom view and side view.

[0034] Fig.13(a) to (c) show electrolytic capacitors according to other modified examples of the first embodiment. Figure 2 (a)~ Figure 2 (c) The same top view, bottom view and side view.

[0035] Fig.14 is from Fig.13 (a) is a cross-sectional view of the electrolytic capacitor observed along line XIV-XIV.

[0036] Fig.15 is from Fig.13 (a) is a cross-sectional view of the electrolytic capacitor observed along the XV-XV line.

[0037] Fig.16 It is a top view of an electrolytic capacitor according to another modification of the first embodiment.

[0038] Fig.17 It is a partially cutaway perspective view partially showing the interior of an electrolytic capacitor according to a second embodiment of the present invention.

[0039] Fig.18 (a) shows the electrolytic capacitor according to the second embodiment, and Figure 3 (a) is a cross-sectional view of the same, and (b) is a top view of the seat plate of (a) viewed from above.

[0040] Fig.19 (a) is a cross-sectional view of another electrolytic capacitor according to the second embodiment, and (b) is a plan view of the seat plate of (a) viewed from above.

[0041] Fig. 20 This is a plan view of a seat plate of another electrolytic capacitor according to the second embodiment, as seen from above.

[0042] Fig.21 is with Fig.19 (a) The same cross-sectional view shows the peripheral fixing portion communicating with the resin member of the electrolytic capacitor.

[0043] Fig. 22 (a)~(d) are related to Fig.18 (b) and Fig.19 (b) The same top view shows the concave flow path (groove) formed on the resin bonding surface.

[0044] Fig.23 is from Fig. 22 (a) is a cross-sectional view of the electrolytic capacitor observed along line XXIII-XXIII.

[0045] Fig.24 is with Fig.23 The same cross-sectional view shows a seat plate including a curved surface that bulges downward from the center toward the peripheral edge.

[0046] Fig.25 is with Fig.21 The same cross-sectional view shows the resin injection hole that penetrates from the resin bonding surface to the mounting surface.

[0047] Fig.26 is from Fig.13 (a) is a cross-sectional view of the electrolytic capacitor according to the second embodiment, taken along line XIV-XIV.

[0048] Fig. 27 is from Fig.13 (a) is a cross-sectional view of the electrolytic capacitor according to the second embodiment, taken along line XV-XV. DETAILED DESCRIPTION

[0049] The following is an explanation of the embodiments of the electrolytic capacitor according to the present invention with reference to the accompanying drawings. In the description of each embodiment, terms expressing directions (such as "above", "below", "outside", and "inside", etc.) are appropriately used for easy understanding. These terms are used for explanation and do not limit the present invention. In addition, in each of the drawings, in order to clarify the shape or characteristics of each component of the electrolytic capacitor, their sizes are illustrated in the form of relative dimensions, which are not necessarily represented by the same scale ratio.

[0050] [First embodiment]

[0051] Figure 1 It is a partially cutaway perspective view partially showing the interior of the electrolytic capacitor 1 according to the first embodiment of the present invention. Figure 2 (a) to (c) are Figure 1 The electrolytic capacitor 1 according to the first embodiment is generally shown in a top view, a bottom view, and a side view. Figure 1 As shown, a capacitor element 10 including a pair of electrodes 2 (only one is shown in the figure), an electrolyte (not shown) between the pair of electrodes 2, a case 20 containing the capacitor element 10 and the electrolyte and having an opening, and a pair of through holes 51 ( Figure 3 ), a resin member 40 (also called an "adhesive material") filled between the sealing body 30 and the seat plate 50, and a pair of leads 60 connected to a pair of electrodes 2 of the capacitor element 10 and extending from a through hole 51 of the seat plate 50. In addition, the seat plate 50 has a resin bonding surface 52 abutting against the resin member 40 and a mounting surface 53 opposite thereto, and has at least one convex portion 70 on the resin bonding surface 52.

[0052] The following describes the capacitor element 10, the housing 20, the sealing body 30, and the lead 60 (electrode 2) widely used in the electrolytic capacitor 1 with reference to the accompanying drawings, but the present invention is not limited to these components, and other capacitor elements, housings, sealing bodies, and electrodes can be used. It should be noted that the electrolytic capacitor 1 of the present invention can also be used for an electrolytic capacitor using an electrolyte or a solid electrolyte such as a conductive polymer as an electrolyte, and a so-called hybrid electrolytic capacitor using an electrolyte and a solid electrolyte as an electrolyte.

[0053] (Capacitor Components)

[0054] Refer again Figure 1 The capacitor element 10 is described. The capacitor element 10 is generally formed by winding an anode foil 12 having a dielectric layer, a cathode foil 14, and a separator 16 for holding an electrolyte therebetween. The capacitor element 10 also includes a pair of electrodes 2 ( Figure 1 Only one electrode 2 is shown in the figure.) In addition, capacitor element 10 has a stopper tape (not shown) for fixing the outermost periphery thereof.

[0055] The anode foil 12 is not limited thereto, and is formed by roughening the surface of a metal foil composed of, for example, a valve metal such as aluminum, tantalum or niobium, or an alloy containing these valve metals. The roughening of the metal foil can be performed using etching treatment techniques such as direct current electrolysis or alternating current electrolysis. By roughening the metal foil, a plurality of concavities and convexities can be formed on its surface. The dielectric layer on the anode foil 12 is formed along the inner wall surface of the holes and depressions (pits) on the roughened surface, thereby increasing its surface area.

[0056] The dielectric layer on the anode foil 12 can be formed by, for example, immersing the metal foil in a chemical conversion solution such as an ammonium adipate solution and subjecting the metal foil to a chemical conversion treatment (under the application of voltage as required). The anode foil 12 can generally be mass-produced by roughening the surface of a large sheet of metal foil containing a valve metal or the like, subjecting the sheet to a chemical conversion treatment, and then cutting the sheet into a desired size.

[0057] Cathode foil 14 is similarly formed by roughening the surface of a metal foil made of a valve metal such as aluminum, tantalum, niobium, or an alloy containing such a valve metal. Cathode foil 14 may be roughened and / or chemically treated similarly to anode foil 12 as needed.

[0058] The spacer 16 is not limited thereto, and may be formed using, for example, a nonwoven fabric containing fibers of cellulose, polyethylene terephthalate, vinylon, or polyamide (for example, aliphatic polyamide, aromatic polyamide such as aramid).

[0059] The capacitor element 10 can be formed by, for example, overlapping and winding an anode foil 12 having a dielectric layer formed thereon, a separator 16, and a cathode foil 14, and retaining an electrolyte in the separator 16. Figure 1 The capacitor element 10 shown is formed by a pair of electrodes 2 ( Figure 1 Only one electrode 2 is shown in the figure. One end of the electrode 2 is electrically connected to the anode foil 12 and the cathode foil 14 respectively, and the other end is connected to the end surface ( Figure 1 The lower middle end surface) is extended outward.

[0060] The electrolyte can use a solid electrolyte, an electrolyte, a mixed electrolyte combining an electrolyte and a solid electrolyte, etc. The electrolyte can be a mixture of a non-aqueous solvent and an ionic substance (solute, such as an organic salt) dissolved therein. The non-aqueous solvent can be an organic solvent or an ionic liquid. As a non-aqueous solvent, for example, ethylene glycol, propylene glycol, cyclopentane, γ-butyrolactone, N-methylacetamide, etc. can be used. As an organic salt, for example, trimethylamine maleate, triethylamine boronate disalicylate, ethyldimethylamine phthalate, 1,2,3,4-tetramethylimidazolinium phthalate, 1,3-dimethyl-2-ethylimidazolinium phthalate, etc. can be cited.

[0061] The solid electrolyte includes, for example, a manganese compound and a conductive polymer. As the conductive polymer, for example, polypyrrole, polythiophene, polyaniline and their derivatives can be used. The solid electrolyte containing the conductive polymer can be formed by, for example, chemically polymerizing and / or electrolytically polymerizing the raw material monomer on the dielectric layer. In addition, the solid electrolyte can be formed by applying a solution in which the conductive polymer is dissolved or a dispersion in which the conductive polymer is dispersed to the dielectric layer. It should be noted that the capacitor element is not limited to the above-mentioned elements. If it functions as a capacitor element, it can be a capacitor element with any structure.

[0062] (Sealing body)

[0063] The sealing body 30 can be formed of any material as long as it has insulating properties, but is preferably formed of a rubber member having high elasticity and sealing properties. In addition, examples of rubber members having high heat resistance include silicone rubber, fluororubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber (Hypalon rubber, etc.), butyl rubber, or isoprene rubber.

[0064] The sealing member 30 is formed in advance to have a planar shape (eg, a disk or optical disc shape) corresponding to the shape of the opening of the case 20 and to have an insertion hole (not shown) for passing the joint portion 19 of the electrode 2 .

[0065] (electrode)

[0066] A pair of electrodes 2 has a joint portion 19 extending from the capacitor element 10, and a pair of leads 60 are connected to the joint portion 19 by welding or the like inside the sealing body 30. The joint portion 19 is formed of a valve action metal such as aluminum, and is preferably covered with an oxide film of the metal. On the other hand, the lead 60 is formed of a CP wire, a Cu wire, etc. containing transition metals such as iron, copper, nickel, and tin. The joint portion 19 and a portion of the lead 60 are buried in the sealing body 30, and the diameter of the lead 60 is smaller than the diameter of the joint portion 19, so that an annular space 32 is formed around the lead 60 in the sealing body 30.

[0067] (case)

[0068] The housing 20 typically has a roughly cylindrical shape and has an opening for accommodating the capacitor element 10 and the sealing body 30. In addition, the roughly cylindrical housing 20 has a side portion 21, and a roughly annular necking portion 23 and a curling portion 25 connected thereto. That is, the curling portion 25 determines the opening of the housing 20. The housing 20 is formed using metals such as aluminum, stainless steel, copper, iron, brass, or their alloys. It should be noted that the side portion 21, the necking portion 23, and the curling portion 25 of the housing 20 may be partially or entirely covered by a laminate film, or may not be covered. The necessity of the laminate film coating and the material of the laminate film can be judged by judging the bonding compatibility with the resin member 40 described later.

[0069] (Resin components, adhesives)

[0070] Electrolytic capacitor 1 according to the embodiment of the present invention includes resin member 40 filled between sealing body 30 and seat plate 50 described later. Figure 3 (a) is from Figure 2 (a) is a cross-sectional view of the electrolytic capacitor 1 observed along line III-III. Figure 3 As shown in (a), the capacitor element 10 and the sealing body 30 are accommodated in the casing 20. Figure 3 (a) In an upside-down state, the fluid resin before curing is filled in a liquid-tight manner into the space defined by the surface of the sealing body 30, the inner surface of the housing 20 and the resin bonding surface 52 of the seat plate 50, and the annular space 32 formed around the lead 60 to form a resin member 40.

[0071] Generally, due to the reflow soldering process under severe conditions or long-term use in a high-temperature environment, the electrolytic capacitor 1 may have its liquid such as electrolyte vaporized, and the internal pressure of the case 20 increases due to the vaporized gas, which applies stress to the sealing body 30. When the internal pressure of the case 20 increases, the electrolyte may infiltrate (permeate) the sealing body 30, or pass through the tiny gaps formed between the sealing body 30 and the joint portion 19 of the electrode 2, or between the sealing body 30 and the case 20 to reach the resin member 40. Then, if the electrolyte evaporates and evaporates to the outside of the case 20, the prescribed characteristics of the electrolytic capacitor 1 cannot be maintained.

[0072] However, according to the first embodiment of the present invention, by providing the protrusion 70 on the seat plate 50, the resin member 40 is fixed in a manner that is tightly fitted with the shell 20 and the seat plate 50. Therefore, even if a liquid such as an electrolyte evaporates in the shell 20 and infiltrates (penetrates) the sealing body 30, or reaches the resin member 40 through a tiny gap, the resin member 40 can substantially reduce or prevent the electrolyte from evaporating from the inside of the shell 20 to the outside, thereby maintaining the desired reliability of the electrolytic capacitor 1.

[0073] That is, the protrusion 70 involved in the first embodiment of the present invention, as described above in the column "Problems to be Solved by the Invention", improves the tightness (sealing) between the resin member 40 (adhesive material) and the shell 20 and the sealing body 30, so that the intrusion path of air, etc. when intruding from the outside into the shell 20 and the evaporation path of liquid such as the electrolyte in the shell 20 when evaporating to the outside are lengthened and complicated (tortuous), thereby achieving the desired long-term reliability of the electrolytic capacitor 1.

[0074] In addition, the resin member 40 involved in the first embodiment of the present invention is filled in the annular space 32 formed around the lead 60 in a liquid-tight manner, so even if the electrolyte reaches the interface between the sealing body 30 and the resin member 40 or the annular space 32, corrosion of the lead 60 formed of a material containing a transition metal can be prevented.

[0075] Next, the manufacturing process before and after filling the resin member 40 is described in more detail. After the capacitor element 10 and the sealing body 30 are accommodated in the case 20, the vicinity of the opening end of the side portion 21 of the case 20 is subjected to a necking process (pressure is applied from the circumferential direction to deform it) to form a necking portion 23, and the case 20 is sealed with the sealing body 30. Furthermore, the opening end of the case 20 is subjected to a curling process (the opening end is deformed radially inward) to form a U-shaped or L-shaped curling portion 25. That is, the necking portion 23 and the curling portion 25 of the case 20 are continuously formed on the side portion 21.

[0076] Then, after pouring, coating or injecting the fluid resin before curing on the sealing body 30 in the curled housing 20, the lead 60 is inserted through the through hole 51 to arrange the seat plate 50. At this time, the curled portion 25 abuts against the surface of the resin bonding surface 52 of the seat plate 50 where the protrusion 70 is not formed (referred to as the "reference surface 54" in this application), so that the housing 20 is aligned with the seat plate 50 in the vertical direction (height direction). Thereafter, the fluid resin is cured to form the resin member 40 filled between the sealing body 30 and the seat plate 50. Furthermore, after the fluid resin is cured to form the resin member 40, the lead 60 is bent so as to extend along the mounting surface 53 of the seat plate 50.

[0077] The fluid resin is preferably a thermosetting or photocurable fluid resin. In addition, the fluid resin may contain fillers, curing agents, polymerization initiators, and / or catalysts. The thermosetting fluid resin may contain, for example, epoxy resins, phenolic resins, urea resins, polyimides, polyamide-imides, polyurethanes, diallyl phthalate, or unsaturated polyesters. The filler may contain, for example, insulating compounds (oxides, etc.) such as silicon dioxide and aluminum oxide, glass, or one or more insulating particles such as mineral materials (talc, mica, clay, etc.).

[0078] The fluid resin may be a thermoplastic resin such as polyphenylene sulfide (PPS) or polybutylene terephthalate (PBT) or a material containing the same. The fluid resin may be injected by molding techniques such as injection molding, insert molding or compression molding.

[0079] (Seat plate, insulation plate)

[0080] Figure 3 (b) Observation from above Figure 3 (a) is a top view of the seat plate 50. Figure 4 (a) is a cross-sectional view of another electrolytic capacitor 1 according to the first embodiment. Figure 4 (b) Observation from above Figure 4 (a) is a top view of the seat plate 50. Figure 5 This is a plan view of the seat plate 50 of another electrolytic capacitor 1 according to the first embodiment as viewed from above. In the figure, a collection of points (ie, circles) where the curled portion 25 of the case 20 abuts against the reference surface 54 of the seat plate 50 are indicated by dotted lines.

[0081] The seat plate 50 according to the embodiment of the present invention is in the simplest form. Figure 3 (b) and Figure 4As shown in (b), the seat plate 50 has a substantially square planar shape and has two notches 55 for indicating polarity. In addition, the seat plate 50 has a resin bonding surface 52 (upper surface) that contacts the resin member 40 and a mounting surface 53 (lower surface) that faces the mounting substrate (not shown), and at least one convex portion 70 is provided on the resin bonding surface 52. The convex portion 70 may be as shown in FIG. Figure 3 As shown in (b), it is a single convex portion formed concentrically with the center of the shell, and it can also be as shown in Figure 4 (b) shows two convex parts 70. In addition, the convex parts 70 can be as follows Figure 5 The figure shows a combination of the protrusions 70 arranged near the center and the protrusions 70 extending radially (radially). In addition, a large number of protrusions 70 may be provided, and the protrusions 70 may be in a grid or zigzag pattern (not shown).

[0082] During use, if the electrolytic capacitor 1 is exposed to a large change in ambient temperature (thermal shock), the sealing body 30 tends to expand or shrink significantly compared to the resin member 40 due to the difference in thermal expansion coefficient between the sealing body 30 and the resin member 40. However, according to the first embodiment of the present invention, by providing the convex portion 70 on the resin joint surface 52, the sealing strength between the sealing body 30 and the resin member 40 can be substantially increased, and the air (oxygen) and / or moisture (water vapor) intruding from the outside can be reliably blocked, and the evaporation (reduction) of liquid such as electrolyte to the outside of the housing 20 can be substantially reduced or prevented, thereby ensuring the desired long-term reliability of the electrolytic capacitor 1.

[0083] It should be noted that, although the details are not shown, when the lead 60 is bent after the resin member 40 is cured, an inclined portion or a curved portion (not shown) may be provided near the through hole 51 of the seat plate 50 in order to reduce the stress applied to the lead 60. In addition, the through hole 51 of the seat plate 50 is formed in the convex portion 70, so that the inclined portion or the curved portion can be easily formed compared to the case where no convex portion is formed as in the prior art.

[0084] In addition, the resin member 40 according to the embodiment of the present invention is preferably Figure 6 As shown, there is a peripheral fixing portion 42 (described in detail later) extending from the curling portion 25 to the necking portion 23 and bonded to at least a portion of the outer surface of the housing 20 to restrict or fix the housing 20 from the outside. As a result, the sealing strength between the seat plate 50, the housing 20, and the resin member 40 is further improved, and air intrusion from the outside is more reliably blocked, and the electrolyte is prevented from evaporating to the outside, so that the electrolytic capacitor 1 can achieve higher reliability.

[0085] (Peripheral fixing part)

[0086] As described above, in the present application, for convenience, the portion of the resin member 40 that fixes the housing 20 from the outside ( Figure 6 ) is called the peripheral fixing portion 42. The peripheral fixing portion 42 is preferably integrated with the resin member 40 filled between the sealing body 30 and the seat plate 50, that is, it is connected (continuous) with the resin member 40. The peripheral fixing portion 42 can be simply formed by providing a flow path for the fluid resin forming the resin member 40 before curing to flow out to the outside of the housing 20.

[0087] Next, refer to Figure 7 to Figure 11 , while describing in detail the form of the seat plate 50 or the curled portion 25 of the housing 20 for forming the peripheral fixing portion 42. Figure 7 (a)~(d) are Figure 3 (b) and Figure 4 (b) is a top view of the seat plate 50 in which a concave flow path 56 (groove portion) is formed on the reference surface 54 of the resin joint surface 52 of the seat plate 50. In the figure, for convenience, the concave flow path 56 is shaded, and the set of points where the curled portion 25 of the housing 20 abuts against the reference surface 54 of the seat plate 50 is indicated by a dotted line (i.e., a broken circle).

[0088] The curled portion 25 of the housing 20 abuts against the reference surface 54 of the resin joint surface 52 of the seat plate 50 in any case, thereby limiting the position (alignment position) of the housing 20 in the up-down direction (height direction) relative to the seat plate 50. When the housing 20 is turned upside down, a viscous fluid resin before curing is poured or injected into the sealing body 30, and the seat plate 50 is pressed downward at a predetermined pressure, the fluid resin fills the reference surface 54 of the resin joint surface 52 of the seat plate 50, the convex portion 70, and the concave flow channel 56 ( Figure 7 ) and the sealing body 30, and the annular space 32 around the lead 60.

[0089] At this time, the remaining fluid resin is pressed out to the outside of the shell 20 through the concave flow channel 56 and flows out along the outer surface of the shell 20. That is, the concave flow channel 56 is a flow channel that connects the fluid resin inside and outside the curling portion 25. It should be noted that when the seat plate 50 is pressed downward, it is preferred that no bubbles are mixed into the space between the sealing body 30 and the seat plate 50. The present invention does not require that no bubbles are mixed at all, and a certain degree of bubble mixing is allowed. If the fluid resin filled and pressed out in this way solidifies, the resin member 40 and the peripheral fixing portion 42 are formed in an integrated form.

[0090] In addition, the fluid resin covers the entire periphery of the curled portion 25, and the curled portion 25 (particularly its end portion) is arranged to be separated from the sealing body 30. In particular, when the curled portion 25 has a U-shape, the fluid resin is filled in such a manner that the upper and lower surfaces of the curled portion 25 including the downwardly convex curved surface are in contact with the fluid resin, and the inner and outer surfaces of the front end portion of the curled portion 25 extending in the direction along the resin bonding surface 52 are in contact with the fluid resin (that is, the fluid resin surrounds and bonds the curled portion 25 from top to bottom and left to right), so that the resin member 40 can fix the curled portion 25 more firmly.

[0091] In addition, it should be supplemented that the front end of the curled portion of Patent Document 2 disclosed above penetrates into the sealing body, and no resin layer is formed on the top of the curled portion. Only the bottom of the curled portion is bonded to the resin layer, so the bonding strength between the curled portion and the resin layer is extremely small.

[0092] Figure 7 (a) and Figure 7 The concave flow channel 56 shown in (b) extends toward the corner 57 of the seat plate 50, and the peripheral fixing portion 42 is formed near the corner 57 of the seat plate 50. Figure 7 (c) and Figure 7 The concave flow channel 56 shown in (d) extends toward the end 58 of the seat plate 50, and the peripheral fixing portion 42 is formed near the end 58 of the seat plate 50. It should be noted that Figure 8 is from Figure 7 The cross-sectional view taken along line VIII-VIII in (a) shows the concave flow passage 56 extending toward the corner 57 of the seat plate 50 .

[0093] The planar dimensions of the seat plate 50 are determined by the user's model or standard specifications. The peripheral fixing portion 42 formed near the corner 57 can be formed larger than the peripheral fixing portion 42 formed near the end 58. Therefore, in terms of improving the tightness between the seat plate 50 and the shell 20 and the resin component 40, the former is more advantageous than the latter.

[0094] It should be noted that the number of the concave flow channels 56 may be less than 3 or more than 5. In addition, the planar shape of the concave flow channels 56 may be larger than the size shown in the figure or smaller than the size shown in the figure. In addition, the concave flow channels 56 are not limited to the corners 57 or the ends 58, but may extend to the middle thereof and may not necessarily be arranged at equal intervals along the circumferential direction.

[0095] Fig. 9 The bottom view of the curling portion 25 of the housing 20 is shown from below, and the dotted line shows the configuration position of the seat plate 50. The curling portion 25 has a substantially annular planar shape and forms at least one ( Fig. 9 The slits 26 of the curled portion 25 and the concave flow passage 56 of the seat plate 50 similarly connect the fluid resin inside and outside the curled portion 25.

[0096] The curled portion 25 of the housing 20 abuts against the reference surface 54 of the resin bonding surface 52 of the seat plate 50 at a portion where the slit 26 is not provided, thereby limiting the position (alignment position) of the housing 20 relative to the seat plate 50 in the up-down direction (height direction). Similarly, after the fluid resin is poured or injected into the sealing body 30, if the seat plate 50 is pressed downward at a predetermined pressure, the fluid resin covers the entire periphery of the curled portion 25 and fills the space between the sealing body 30 and the resin bonding surface 52 of the seat plate 50, as well as the annular space 32 around the lead 60. In addition, the remaining fluid resin is pressed out to the outside of the housing 20 through the slit 26 of the curled portion 25, and flows out along the outer surface of the housing 20 due to the action of gravity. When the fluid resin filled and pressed out in this way is solidified, the resin member 40 and the peripheral fixing portion 42 that are connected (continuous) to each other are formed in an integrated form.

[0097] It should be noted that, although not shown in detail, the number of slits 26 of the curling portion 25 is not limited to four ( Fig. 9 ), or less than 3 or more than 5. In addition, the slits 26 are not limited to extending toward the corners 57 of the seat plate 50, but may also extend toward the end 58 or toward the middle thereof, and may not necessarily be arranged at equal intervals in the circumferential direction.

[0098] As described above, after the fluid resin is poured or injected into the sealing body 30, when the seat plate 50 is pressed downward at a predetermined pressure, it is preferred that no air bubbles are mixed into the space between the sealing body 30 and the seat plate 50. Fig.10 As shown, the reference surface 54 (refer to Figure 7 (c) and Figure 7 (d)), and is configured to have a curved surface that is continuous with the centrally arranged convex portion 70 and the concave flow channel 56. That is, the resin bonding surface 52 of the seat plate 50 is formed to include a curved surface that convexes upward from the center toward the peripheral portion, and can be configured to discharge bubbles that may be included in the fluid resin from the center to the peripheral portion, and further from the concave flow channel 56 to the outside of the housing 20.

[0099] In addition, the fluid resin can be injected by using molding techniques such as injection molding, insert molding or compression molding. Fig.11As shown, there may be a resin injection hole 59 for injecting the fluid resin before curing between the sealing body 30 and the seat plate 50, which passes through the resin joint surface 52 to the mounting surface 53. One or more resin injection holes 59 may be provided. In addition to the resin injection hole 59, the seat plate 50 also has an exhaust hole (not shown) for exhausting air when injecting the fluid resin, and it is preferred that no bubbles are mixed into the space between the sealing body 30 and the seat plate 50. At the time when the filling of the fluid resin is completed, the resin injection hole 59 and the exhaust hole are filled with the fluid resin in the same manner as the space between the sealing body 30 and the seat plate 50.

[0100] It should be noted that Figure 3 (a) and Figure 4 In the cross-sectional views of FIG. (a) and the like, the resin member 40 is described above as being filled in a manner such that it is completely in close contact with the surface of the sealing body 30, the inner surface of the housing 20, the resin joint surface 52 of the seat plate 50, and the lead 60 of the annular space 32, but the present invention is not limited thereto. That is, as described above, if at least one convex portion 70 is provided on the resin joint surface 52, the intrusion path of air or the like when intruding from the outside into the housing 20 and the evaporation path of liquid such as the electrolyte in the housing 20 when evaporating to the outside are increased and complicated, so as to substantially ensure the desired long-term reliability of the electrolytic capacitor 1, the present invention does not exclude the case where the resin member 40 is slightly deviated from the above-mentioned components.

[0101] (Modification of seat plate (insulating plate))

[0102] Fig.12 (a)~ Fig.12 (c) and Fig.13 (a)~ Fig.13 (c) and (d) respectively show the electrolytic capacitor 1 according to the modified example of the first embodiment described above, Figure 2 (a)~ Figure 2 (c) Similar top view, bottom view and side view. It should be noted that the electrolytic capacitor 1 according to the modification has the same structure as the above-mentioned embodiment except that the seat plate 50 has a wall portion 80 extending along the case 20, and thus the description of the duplicate structure is omitted.

[0103] The seat plate 50 of the electrolytic capacitor 1 according to the first embodiment described above is generally referred to as a "flat seat plate". Fig.12 (a)~ Fig.12 The seat plate 50 of the electrolytic capacitor 1 according to the modification shown in (c) has a wall portion 80 extending along the curled portion 25 of the shell 20. The wall portion 80 aligns the shell 20 with respect to the seat plate 50 in the horizontal direction, and is therefore also referred to as a "position-aligned flat seat plate". Fig.13 (a)~ Fig.13The seat plate 50 involved in the modified example shown in (c) has an anti-vibration wall portion 80 extending longer along the side portion 21 and the necked portion 23 of the housing 20. The anti-vibration wall portion 80 reliably fixes the housing 20 to the seat plate 50 and improves the anti-vibration performance, so it is also called a "anti-vibration seat plate". Both the "position alignment flat seat plate" and the "anti-vibration seat plate" have the wall portion 80 at the corner portion 57 of the seat plate 50, so in this application, for convenience, they are collectively referred to as the anti-vibration seat plate 50 in the following description.

[0104] Detailed description is omitted, but as described above in the embodiment involving the electrolytic capacitor 1 with a flat seat plate, the concave flow path 56 (groove portion) of the seat plate 50 that connects (connects) the resin member 40 and the peripheral fixing portion 42 and the gap 26 of the curled portion 25 can also be similarly applied to the electrolytic capacitor 1 with a vibration-proof seat plate.

[0105] Fig.14 is from Fig.13 (a) is a cross-sectional view taken along line XIV-XIV. Fig.15 is from Fig.13 (a) is a cross-sectional view taken along the line XV-XV. The anti-vibration seat plate 50 has a wall portion 80 at the corner portion 57. Fig.15 As shown, the structure is constructed in such a way that the resin component 40 is filled in the gap 82 formed between the side portion 21 (selectably the necking portion 23 or the curling portion 25) of the shell 20 and the wall portion 80. The higher the wall portion 80 of the anti-vibration seat plate 50, the more fluid resin is filled between the shell 20 and the wall portion 80 of the anti-vibration seat plate 50, which can further increase the sealing strength between the seat plate 50 and the shell 20 and the resin component 40. In this way, the electrolytic capacitor 1 with the anti-vibration seat plate 50 blocks the air that invades from the outside, prevents the electrolyte from evaporating to the outside, and thus can achieve higher reliability of the electrolytic capacitor 1. In addition, as Fig.14 As shown, the wall portion 80 has a portion where the distance from the side portion 21 of the housing 20 is narrow, so that the housing 20 and the anti-vibration seat plate 50 can be more accurately aligned.

[0106] As mentioned above, the planar dimensions of the seat plate 50 are generally specified according to the user's model or standard specifications, such as Fig.16As shown, the diameter of the case 20 can be reduced or the plane size of the seat plate 50 can be increased, the wall portion 80 can be formed so as to surround not only the corner portion 57 of the anti-vibration seat plate 50 but also the case 20, and the resin member 40 can be formed so as to fill the gap 82 provided in the entire periphery of the case 20 with a fluid resin. The fluid resin filled in the gap 82 provided in the entire periphery of the case 20 can further increase the adhesion strength between the seat plate 50 and the case 20 and the resin member 40, compared with the fluid resin filled only in the gap 82 between the corner portion 57 of the seat plate 50 and the case 20. The electrolytic capacitor 1 having the anti-vibration seat plate 50 configured in this way can more reliably block air or the like that intrudes from the outside, prevent the electrolyte or the like from evaporating to the outside, and can achieve higher reliability of the electrolytic capacitor 1.

[0107] [Second embodiment]

[0108] One side reference Figure 17 to Figure 27 , while explaining an electrolytic capacitor 1 according to a second embodiment of the present invention. The electrolytic capacitor 1 according to the second embodiment has substantially the same structure as the first embodiment except that the seat plate 50 has at least one concave portion 75 instead of the convex portion 70 on the resin bonding surface 52, and thus the description of the duplicated contents is omitted.

[0109] Fig.17 1 is a partially cutaway perspective view partially showing the inside of an electrolytic capacitor 1 according to a second embodiment of the present invention. The top view, bottom view, and side view showing the outer shape of the electrolytic capacitor 1 according to the second embodiment are similar to those of the electrolytic capacitor 1 according to the first embodiment. Figure 2 (a) to (c) are the same.

[0110] The capacitor element 10 , case 20 , sealing member 30 , resin member 40 , and lead 60 (electrode 2 ) used in the electrolytic capacitor 1 according to the second embodiment have the same configuration as those of the first embodiment and are formed by the same method.

[0111] Fig.18 (a) is the electrolytic capacitor 1 according to the second embodiment. Figure 3 (a) The same cross-sectional view, Fig.18 (b) Observation from above Fig.18 (a) Top view of the seat plate. Fig.19 (a) is a cross-sectional view of another electrolytic capacitor 1 according to the second embodiment. Fig.19 (b) Observation from above Fig.19 (a) is a top view of the seat plate 50. Fig. 20 1 is a plan view of seat plate 50 of another electrolytic capacitor 1 according to the second embodiment as viewed from above. In the figure, a collection of points (ie, circles) where curled portion 25 of case 20 abuts against reference surface 54 of seat plate 50 are indicated by dotted lines.

[0112] As described above, in the electrolytic capacitor 1 according to the second embodiment, the seat plate 50 has at least one recess 75 (see in particular the recess 75 of FIG. 5 ) on the resin joint surface 52. Fig.17 , Fig.18 (a) and Fig.19 (a)).

[0113] That is, according to the second embodiment of the present invention, similarly to the first embodiment, by providing the recess 75 in the seat plate 50, the resin member 40 is fixed in a manner that is closely fitted with the case 20 and the seat plate 50. Therefore, even if a liquid such as an electrolyte evaporates in the case 20 and infiltrates (penetrates) the sealing body 30, or reaches the resin member 40 through a small gap, the resin member 40 can substantially reduce or prevent the electrolyte from evaporating from the inside of the case 20 to the outside. In this way, the reliability desired as the electrolytic capacitor 1 can be maintained.

[0114] In addition, the recessed portion 75 according to the second embodiment of the present invention can increase the adhesion (sealing) between the resin member 40 (adhesive material), the case 20, and the sealing body 30, thereby making the intrusion path of air or the like when intruding from the outside into the case 20, and the evaporation path of liquid such as the electrolyte in the case 20 when evaporating to the outside longer and more complicated (tortuous). Thus, the desired reliability of the electrolytic capacitor 1 can be achieved for a longer period of time.

[0115] In addition, the resin member 40 according to the second embodiment is filled so as to seal the annular space 32 formed around the lead 60 in a liquid-tight manner, similarly to the first embodiment. Therefore, even if the electrolyte reaches the interface between the sealing body 30 and the resin member 40 or the annular space 32, the lead 60 formed of a material containing a transition metal can be prevented from being corroded (see Fig.18 (a) and Fig.19 (a)).

[0116] The manufacturing steps before and after filling the resin member 40 , and the specific characteristics and constituent materials of the fluid resin are the same as those of the first embodiment, and thus detailed description thereof will be omitted.

[0117] The seat plate 50 (insulating plate) is the simplest form, such as Fig.18 (b) and Fig.19 As shown in (b), the seat plate 50 has a substantially square planar shape and has two notches 55 for indicating polarity. In addition, the seat plate 50 has a resin bonding surface 52 (upper surface) that contacts the resin member 40 and a mounting surface 53 (lower surface) that faces the mounting substrate (not shown). The resin bonding surface 52 is provided with at least one recess 75. The recess 75 can be as shown in FIG. Fig.18 (b) has a circular planar shape formed concentrically with the center of the shell, or Fig.19 (b) has a doughnut-shaped plane. In addition, the recess 75 may also be as shown in FIG. Fig. 20 The combination of the concave portion 75 arranged near the center and the concave portion 75 extending radially (radially) is shown. In addition, a large number of concave portions 75 may be provided, and the concave portions 75 may be lattice-shaped or zigzag-shaped (not shown).

[0118] During use, if the electrolytic capacitor 1 is exposed to a large change in ambient temperature (thermal shock), the sealing body 30 tends to expand or shrink significantly compared to the resin member 40 due to the difference in thermal expansion coefficient between the sealing body 30 and the resin member 40. However, according to the second embodiment of the present invention, by providing the recess 75 on the resin joint surface 52, it is possible to substantially increase the sealing strength between the sealing body 30 and the resin member 40, reliably block the air (oxygen) and / or moisture (water vapor) intruding from the outside, and substantially reduce or prevent the evaporation (reduction) of liquid such as electrolyte to the outside of the housing 20, thereby ensuring the desired long-term reliability of the electrolytic capacitor 1.

[0119] In addition, the resin member 40 according to the second embodiment of the present invention is preferably Fig.21 As shown, the peripheral fixing portion 42 is provided, which extends from the curling portion 25 to the necking portion 23 and is bonded to at least a portion of the outer surface of the housing 20, so as to restrict or fix the housing 20 from the outside. As a result, the sealing strength between the seat plate 50, the housing 20, and the resin member 40 is further improved, and the air intrusion from the outside is more reliably blocked, and the electrolyte is prevented from evaporating to the outside, so that the electrolytic capacitor 1 can achieve higher reliability.

[0120] Fig. 22 (a)~(d) are Fig.18 (b) and Fig.19 (b) is a top view of the seat plate 50 in which a concave flow path 56 (groove portion) is formed on the reference surface 54 of the resin joint surface 52 of the seat plate 50. In the figure, for convenience, the concave flow path 56 is shaded, and the set of points where the curled portion 25 of the housing 20 abuts against the reference surface 54 of the seat plate 50 is indicated by a dotted line (i.e., a broken circle).

[0121] Fig. 22 (a) and Fig. 22 The concave flow channel 56 shown in (b) extends toward the corner 57 of the seat plate 50, and the peripheral fixing portion 42 is formed near the corner 57 of the seat plate 50. Fig. 22 (c) and Fig. 22 The concave flow channel 56 shown in (d) extends toward the end 58 of the seat plate 50, and the peripheral fixing portion 42 is formed near the end 58 of the seat plate 50. It should be noted that Fig.23 is from Fig. 22The cross-sectional view taken along line XXIII-XXIII in (a) shows the concave flow passage 56 extending toward the corner 57 of the seat plate 50 .

[0122] It should be noted that Fig.23 The recessed flow passage 56 shown is shown as having the same depth as the recessed portion 75 formed in the seat plate 50 inside the curled portion 25 , but the present invention is not limited thereto, and the recessed flow passage 56 may be formed shallower or deeper than the recessed portion 75 .

[0123] The configurations of the peripheral fixing portion 42 , the concave flow passage 56 , and the slit 26 , and the method of forming the peripheral fixing portion 42 are the same as those of the first embodiment, and thus further description of the overlapping parts will be omitted.

[0124] It should be noted that, after the fluid resin is poured or injected into the sealing body 30 , when the seat plate 50 is pressed downward at a predetermined pressure, it is preferred that no air bubbles are mixed into the space between the sealing body 30 and the seat plate 50 . Fig.24 The seat plate 50 shown is formed to include a curved surface convex downward from the center toward the periphery, so that bubbles that may be included in the fluid resin are discharged from the center to the periphery and further from the concave flow path 56 to the outside of the housing 20 .

[0125] Seat plate 50 Fig.25 As shown, there may be a resin injection hole 59 for injecting the fluid resin before curing between the sealing body 30 and the seat plate 50, which passes through the resin joint surface 52 to the mounting surface 53. One or more resin injection holes 59 may be provided. In addition to the resin injection hole 59, the seat plate 50 also has an exhaust hole (not shown) for exhausting air when injecting the fluid resin, and it is preferred that no bubbles are mixed into the space between the sealing body 30 and the seat plate 50. At the time when the filling of the fluid resin is completed, the resin injection hole 59 and the exhaust hole are filled with the fluid resin in the same manner as the space between the sealing body 30 and the seat plate 50.

[0126] Although not shown in detail here, the vibration-proof seat plate 50 (insulating plate) of the first embodiment is described in detail. Fig.12 (a)~ Fig.12 (c) Fig.13 (a)~ Fig.13 (c) and Figure 14 to Figure 16 The modified example described above is also applicable to the second embodiment (the vibration-proof seat plate 50 having the recessed portion 75 ).

[0127] Fig.26 and Fig. 27 They are respectively Fig.13 (a) is a cross-sectional view of the electrolytic capacitor according to the second embodiment as viewed along the lines XIV-XIV and XV-XV. The anti-vibration seat plate 50 has a wall portion 80 at the corner portion 57, such as Fig. 27As shown, the structure is constructed in such a way that the resin component 40 is filled in the gap 82 formed between the side portion 21 (selectively, the necking portion 23 or the curling portion 25) and the wall portion 80 of the shell 20. The higher the wall portion 80 of the anti-vibration seat plate 50, the more fluid resin is filled between the shell 20 and the wall portion 80 of the anti-vibration seat plate 50, which can further increase the sealing strength between the seat plate 50 and the shell 20 and the resin component 40. In this way, the electrolytic capacitor 1 with the anti-vibration seat plate 50 can prevent the evaporation of the electrolyte to the outside by blocking the air intruding from the outside. In addition, as Fig.26 As shown, the wall portion 80 has a portion where the distance from the side portion 21 of the housing 20 is narrow, so that the housing 20 and the anti-vibration seat plate 50 can be more accurately aligned.

[0128] Industrial Applicability

[0129] The present invention can be used for an electrolytic capacitor having a resin member filled between a sealing body and a seat plate.

[0130] Explanation of symbols

[0131] 1...Electrolytic capacitor, 2...Electrode,

[0132] 10...capacitor element, 12...anode foil, 14...cathode foil,

[0133] 16...spacer, 19...joint,

[0134] 20... housing, 21... side, 23... necking portion, 25... curling portion, 26... gap,

[0135] 30...sealing body, 32...annular space,

[0136] 40...resin member (adhesive material), 42...peripheral fixing portion,

[0137] 50...seat plate (insulating plate), 51...through hole, 52...resin joint surface, 53...mounting surface, 54...reference surface, 55...notch portion, 56...concave flow channel (groove portion), 57...corner portion,

[0138] 58...end, 59...resin injection hole,

[0139] 60...lead,

[0140] 70...convex part, 75...concave part,

[0141] 80...Wall, 82...Gap

Claims

1. An electrolytic capacitor, It has: A capacitor element comprising a pair of electrodes, an electrolyte between the pair of electrodes, a pair of leads electrically connected to the pair of electrodes, a housing containing the capacitor element and the electrolyte and having an opening, a sealing body that seals the opening and has a pair of insertion holes for leading out the lead wires; an insulating plate having a pair of through holes for leading out the lead wires, and a resin member filled between the sealing body and the insulating plate, The insulating plate has a resin joint surface that contacts the resin member and a mounting surface that faces the resin joint surface, and the resin joint surface has at least one convex portion. The convex portion is at least a combination of a plurality of convex portions extending radially in a radial direction, The housing has a curled portion including the opening, The plurality of projections form at least one groove portion on the resin bonding surface, the groove being arranged below at least a portion of the curled portion.

2. The electrolytic capacitor according to claim 1, wherein: The resin member filled between the sealing body and the insulating plate fills the space between the curled portion and the groove portion.

3. The electrolytic capacitor according to claim 1 or 2, wherein: The convex portion is in a lattice shape or a zigzag shape.

4. The electrolytic capacitor according to claim 1 or 2, wherein: The shell has a necked portion connected to the curled portion on the outer surface of the shell, and a side portion connected to the necked portion. The insulating plate has a wall portion extending from the resin joint surface along the outer surface of the housing to the side portion, The resin member is configured so that a gap formed between the outer surface and the wall portion covers a portion of the outer surface.

5. The electrolytic capacitor according to claim 4, wherein: The main surface of the insulating plate has a rectangular shape, The wall portion is disposed at a corner portion of the insulating plate.

6. The electrolytic capacitor according to claim 1 or 2, wherein: An end portion of the curled portion is separated from the sealing body, and the resin member is filled between the curled portion and the sealing body.

7. The electrolytic capacitor according to claim 1 or 2, wherein: The convex portion of the insulating plate is arranged on an inner side than the curled portion.

8. The electrolytic capacitor according to claim 1 or 2, wherein: At least a portion of the curled portion abuts against the resin joint surface of the insulating plate.

9. The electrolytic capacitor according to claim 1 or 2, wherein: The electrode has a connector portion in the sealing body that is electrically connected to the lead wire. The sealing body has a pair of annular spaces formed around the lead wire having a smaller diameter than the joint portion. The resin member fills the annular space.

10. The electrolytic capacitor according to claim 1 or 2, wherein: The insulating plate has a resin injection hole extending from the resin joint surface to the mounting surface between the pair of through holes.

11. The electrolytic capacitor according to claim 1 or 2, wherein: The resin joint surface of the insulating plate includes a curved surface that bulges upward from a center toward a peripheral edge portion of the resin joint surface.

12. An electrolytic capacitor, It has: A capacitor element comprising a pair of electrodes, an electrolyte between the pair of electrodes, a pair of leads electrically connected to the pair of electrodes, a housing containing the capacitor element and the electrolyte and having an opening, a sealing body that seals the opening and has a pair of insertion holes for leading out the lead wires; an insulating plate having a pair of through holes for leading out the lead wires, and a resin member filled between the sealing body and the insulating plate, The insulating plate has a resin joint surface that contacts the resin member and a mounting surface that faces the resin joint surface, and the resin joint surface has at least one recessed portion. The recessed portion is at least a combination of a plurality of recessed portions extending radially in a radial direction. The housing has a curled portion including the opening, The plurality of recessed portions form at least one groove portion on the resin bonding surface, which is arranged below at least a portion of the curled portion.

13. The electrolytic capacitor according to claim 12, wherein: The resin member filled between the sealing body and the insulating plate fills the space between the curled portion and the groove portion.

14. The electrolytic capacitor according to claim 12 or 13, wherein: The concave portion is in a lattice shape or a zigzag shape.

15. The electrolytic capacitor according to claim 12 or 13, wherein: The shell has a necked portion connected to the curled portion on the outer surface of the shell, and a side portion connected to the necked portion. The insulating plate has a wall portion extending from the resin joint surface along the outer surface of the housing to the side portion, The resin member is configured so that a gap formed between the outer surface and the wall portion covers a portion of the outer surface.

16. The electrolytic capacitor according to claim 15, wherein: The main surface of the insulating plate has a rectangular shape, The wall portion is disposed at a corner portion of the insulating plate.

17. The electrolytic capacitor according to claim 12 or 13, wherein: An end portion of the curled portion is separated from the sealing body, and the resin member is filled between the curled portion and the sealing body.

18. The electrolytic capacitor according to claim 12 or 13, wherein: The recessed portion of the insulating plate is arranged on an inner side than the curled portion.

19. The electrolytic capacitor according to claim 12 or 13, wherein: At least a portion of the curled portion abuts against the resin joint surface of the insulating plate.

20. The electrolytic capacitor according to claim 12 or 13, wherein: The electrode has a connector portion in the sealing body that is electrically connected to the lead wire. The sealing body has a pair of annular spaces formed around the lead wire having a smaller diameter than the joint portion. The resin member fills the annular space.

21. The electrolytic capacitor according to claim 12 or 13, wherein: The insulating plate has a resin injection hole extending from the resin joint surface to the mounting surface between the pair of through holes.

22. The electrolytic capacitor according to claim 12 or 13, wherein: The resin joint surface of the insulating plate includes a curved surface that convexly projects downward from a center of the resin joint surface toward a peripheral edge portion.

Images