Sealing body for electrolytic capacitor, and electrolytic capacitor

Abstract

The present disclosure relates to a sealing body for an electrolytic capacitor and an electrolytic capacitor provided with the sealing body, which can effectively prevent mutual adhesion and improve productivity. A sealing body (12) for an electrolytic capacitor has a first surface (121), a second surface (122) on the opposite side of the first surface (121), and a through hole (124) penetrating from the first surface (121) to the second surface (122), a first protrusion (121T) is formed on the first surface, a second protrusion (122T) is formed on the second surface, and the first protrusion (121T) and the second protrusion (122T) are not in contact with the through hole (124).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a sealing body for an electrolytic capacitor and an electrolytic capacitor provided with the sealing body. BACKGROUND

[0002] An electrolytic capacitor is widely used as a capacitor that is small in size and large in capacity and low in ESR (equivalent series resistance). For example, Patent Document 1 discloses an electrolytic capacitor as follows, which is provided with a capacitor element 210 that is wound with a separator interposed between an anode body and a cathode body each of which is connected with a lead terminal 215A, 215B and a lead wire 214A, 214B, a substantially cylindrical bottomed case 211 that accommodates the capacitor element 210 and an electrolytic solution, and a sealing body 212 that closes an opening of the bottomed case 211, as shown in FIG. 1. Figure 6

[0003] The sealing body is generally made of an elastic material such as IIR (butyl) rubber, which is very smooth on the surface. Also, the sealing body is usually bagged in a bag during production, transportation, storage, and the like, and a plurality of sealing bodies are accommodated in one package bag, so there is a case where the smooth surfaces (front surface or back surface) of the plurality of sealing bodies are in close contact with each other over a large area and are stuck together.

[0004] In this regard, a method of separating the sealing bodies stuck together by vibration of a parts feeder or the like has been used in the past, but there is still a problem in actual use that the sealing bodies that are not separated and are stuck together are directly supplied to subsequent equipment, resulting in a decrease in productivity.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT DOCUMENTS

[0007] Patent Document 1: Chinese Patent No. 108292565 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] An object of the present disclosure is to provide a sealing body for an electrolytic capacitor and an electrolytic capacitor provided with the sealing body, which can effectively prevent sticking together of the sealing bodies and improve productivity thereof.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] To solve the problems, the present disclosure provides a sealing body for an electrolytic capacitor, which has a first surface, a second surface on the opposite side of the first surface, and a through-hole that penetrates from the first surface to the second surface, characterized in that a first protrusion is formed on the first surface, and a second protrusion is formed on the second surface, and the first protrusion and the second protrusion do not communicate with the through-hole.​

[0012] Further, the present disclosure provides an electrolytic capacitor characterized by comprising: a capacitor element including a lead terminal; an electrolytic solution impregnating the capacitor element; a case housing the capacitor element and the electrolytic solution; and the sealing body for electrolytic capacitor described above, the sealing body for electrolytic capacitor closing an opening of the case in a manner that either the first face or the second face faces inside the case, the lead terminal of the capacitor element being disposed in the through hole of the sealing body for electrolytic capacitor.

[0013] Effect of Invention

[0014] According to the present disclosure, it is possible to provide a sealing body for electrolytic capacitor and an electrolytic capacitor provided with the same, which effectively prevent adhesion to each other and thereby improve productivity thereof. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a cross-sectional view of an electrolytic capacitor according to an embodiment of the present disclosure.

[0016] Figure 2 is a view for explaining a capacitor element constituting the electrolytic capacitor.

[0017] Figure 3 is a view of a first face of a sealing body for electrolytic capacitor according to an embodiment of the present disclosure.

[0018] Figure 4 is a view of a second face of a sealing body for electrolytic capacitor according to an embodiment of the present disclosure.

[0019] Figure 5 (a) of FIG. 1 is Figure 3 A-A cross-sectional view of FIG. 1, Figure 5 (b) of FIG. 1 is an enlarged view of the first protrusion, Figure 5 (c) of FIG. 1 is an enlarged view of the second protrusion.

[0020] Figure 6 is a cross-sectional view of an electrolytic capacitor according to Patent Literature 1 as a related art.

[0021] REFERENCE NUMERALS

[0022] 1, 2 electrolytic capacitor

[0023] 10, 210 capacitor element

[0024] 11, 211 case

[0025] 12, 212 sealing body

[0026] 121 first face

[0027] 122 second surface

[0028] 121T (121T1, 121T2) first protrusion

[0029] 122T second protrusion

[0030] 124 through hole

[0031] 14A, 14B, 214A, 214B lead wire

[0032] 15A, 15B, 215A, 215B lead wire terminal

[0033] 21 anode body

[0034] 22 cathode body

[0035] 23 spacer

[0036] 24 sealing tape DETAILED DESCRIPTION

[0037] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. However, the size, material, shape, relative arrangement of the constituent members described in the embodiment, and the like do not mean that the scope of the present disclosure is limited thereto unless specifically described, but are merely illustrative.

[0038] (Electrolytic Capacitor 1)

[0039] First, the overall structure of the electrolytic capacitor will be described. Figure 1 is a cross-sectional view of the electrolytic capacitor 1, Figure 2 is a schematic view for explaining a capacitor element 10 constituting the electrolytic capacitor 1. As Figure 1 indicated, the electrolytic capacitor 1 according to the present disclosure is provided with the capacitor element 10, an electrolytic solution for impregnating the capacitor element, a case 11 for accommodating the capacitor element 10 and the electrolytic solution, and a sealing body 12 for closing an opening of the case 11.

[0040] The capacitor element 10 is made of a winding body as Figure 2 indicated. The winding body is a semi-finished product of the capacitor element 10, and refers to a winding body in which a solid electrolyte layer has not yet been formed between an anode body 21 and a cathode body 22 having a dielectric layer on the surface. The winding body is provided with the anode body 21, the cathode body 22, and a spacer 23.

[0041] The anode body 21 and the cathode body 22 are wound with the spacer 23 interposed therebetween. The outermost periphery of the winding body is fixed by a sealing tape 24. Note that, Figure 2A portion of the outermost periphery of the sealed jelly-roll is shown in a state of being unwound. The anode body 21 is provided with a metal foil roughened so as to have a surface with unevenness, and a dielectric layer is formed on the metal foil having unevenness. A solid electrolyte layer is formed by causing a conductive polymer to adhere to at least a portion of the surface of the dielectric layer. The solid electrolyte layer can cover at least a portion of the surface of the cathode body 22 and / or the surface of the spacer 23.

[0042] The capacitor element 10 further includes lead terminals including lead wires 14A, 14B for connection to an external circuit, a lead wire joint 15A for connecting the anode body 21 and the lead wire 14A, and a lead wire joint 15B for connecting the cathode body 22 and the lead wire 14B.

[0043] The capacitor element 10 and the electrolytic solution are housed together in the case 11. The case 11 is formed in a bottomed cylindrical shape having a substantially circular cross section with an opening at one end. The vicinity of the opening end of the case 11 is drawn inward to fix the seal body 12 described later. As the material of the case 11, a metal such as aluminum, stainless steel, copper, iron, brass, or an alloy thereof can be used.

[0044] (Seal body 12)

[0045] Figure 3 is a schematic view of the first face 121 of the seal body 12. Figure 4 is a schematic view of the second face 122 of the seal body 12. Figure 5 (a) of FIG. 8 is Figure 3 A-A cross-sectional view of FIG. 8, Figure 5 (b) of FIG. 8 is an enlarged view of the first protrusion 121T, Figure 5 (c) of FIG. 8 is an enlarged view of the second protrusion 122T.

[0046] The seal body 12 is a member for closing the opening of the case 11. The seal body 12 is formed of a material having elasticity, and for example, an ethylene-propylene rubber, a fluororubber, an acrylonitrile-butadiene rubber, a butyl rubber, or the like can be used. As shown in Figures 3 to 5As shown, the sealing body 12 is formed in a generally circular plate shape, having a first surface 121, a second surface 122, and a side surface connecting the first surface 121 and the second surface 122. The sealing body 12 is provided with two through holes 124 extending from the first surface 121 to the second surface 122 for the lead wires 14A, 14B and lead wire connectors 15A, 15B to pass through. The two through holes 124 are symmetrically arranged with respect to the central axis of the sealing body 12. The diameter of the through hole 124 is smaller than the diameter of the leads 14A, 14B and the lead connectors 15A, 15B. When the leads 14A, 14B and the lead connectors 15A, 15B are inserted into the through hole 124 of the sealing body 12, the through hole 124 is enlarged and tightly fitted to the leads 14A, 14B and the lead connectors 15A, 15B because the sealing body 12 is formed of an elastic material. This prevents the electrolyte inside the housing 11 from leaking out between the leads 14A, 14B and the through hole 124 and between the lead connectors 15A, 15B and the through hole 124. When installing the sealing body 12 into the housing 11, the sealing body 12 is inserted into the opening of the housing 11 with either the first surface 121 or the second surface 122 facing the capacitor element 10 inside the housing 11. As described above, a deep drawing process is performed inward near the opening end of the housing 11. Therefore, the side of the sealing body 12 is squeezed and deformed inward by the deep drawing part of the housing 11 and is engaged and fixed with the deep drawing part, thereby preventing the electrolyte inside the housing 11 from leaking out from the outer periphery of the sealing body 12 and the opening of the housing 11.

[0047] like Figure 3 As shown, a first protrusion 121T is provided on the first surface 121 of the sealing body 12. In this embodiment, the first protrusion 121T includes a first protrusion 121T1 provided on the radially outer side of the through hole 124 and a first protrusion 121T2 provided on the radially inner side of the through hole 124. That is, neither the first protrusion 121T1 nor 121T2 is in contact with the through hole 124. In other words, no protrusion in contact with the through hole 124 is provided on the first surface 121. When viewed from a direction perpendicular to the first surface 121, the first protrusions 121T1 and 121T2 are each formed into annular shapes and are arranged concentrically with each other. Hereinafter, without distinguishing between the radially outer first protrusion 121T1 and the radially inner first protrusion 121T2, they will be collectively referred to as the first protrusion 121T.

[0048] like Figure 4 As shown, a second protrusion 122T is provided on the second surface 122 of the sealing body 12, forming radially outward of the through hole 124. That is, the second protrusion 122T does not connect with the through hole 124. In other words, no protrusion connecting with the through hole 124 is provided on the second surface 122. When viewed from a direction perpendicular to the second surface 122, the second protrusion 122T is also formed in an annular shape.

[0049] In addition, as Figure 5 As shown in (b) and (c) in particular, each of the first protrusion 121T and the second protrusion 122T has a circular arc shape in cross section, and more specifically, the first protrusion 121T has a circular arc shape in cross section perpendicular to the first face 121, and the second protrusion 122T has a circular arc shape in cross section perpendicular to the second face 122.

[0050] (EFFECTS)

[0051] In the present embodiment, since the closure 12 is provided with the first protrusion 121T on the first face 121 and the second protrusion 122T on the second face 122, even when a plurality of closures 12 are housed in one package during production, transportation, storage, and the like, the first face 121 or the second face 122 of the plurality of closures 12 does not directly contact each other but contacts via the first protrusion 121T or the second protrusion 122T, thereby reducing the contact area with each other, and the plurality of closures 12 can be effectively prevented from adhering to each other, and thus the productivity is improved.

[0052] In addition, in the present embodiment, neither the first face 121 nor the second face 122 has the first protrusion 121T or the second protrusion 122T that is in contact with the through hole 124. Therefore, when the closure 12 is fitted to the case 11 of the electrolytic capacitor 1, the first protrusion 121T or the second protrusion 122T does not contact the lead 14A, 14B or the lead terminal 15A, 15B, and thus the case where the first protrusion 121T or the second protrusion 122T exerts a force on the lead 14A, 14B or the lead terminal 15A, 15B to reduce the sealing property of the through hole 124 can be avoided.

[0053] In addition, neither the first face 121 nor the second face 122 has the first protrusion 121T or the second protrusion 122T that is in contact with the through hole 124, that is, the first protrusion 121T or the second protrusion 122T is not broken by the through hole 124, and thus the integrity of each of the first protrusion 121T and the second protrusion 122T is improved, and the closure 12 is less likely to be deformed, and the ease of manufacturing the closure 12 is improved.

[0054] In the present embodiment, the height of each of the first protrusion 121T and the second protrusion 122T is preferably 0.01 mm or more and 0.10 mm or less. If the height is less than 0.01 mm, since the closure 12 is made of an elastic material, the first face 121 or the second face 122 of the plurality of closures 12 can not be prevented from directly contacting each other, and thus the anti-adhesion effect is not satisfactory. If the height is more than 0.1 mm, the anti-adhesion effect does not significantly increase, and since the height of the protrusion is large, the closure 12 is likely to be hooked by other members, and thus the productivity is poor, and thus this is not preferable.

[0055] In this embodiment, the ratio of the area where the first protrusion 121T contacts the first surface 121 to the surface area of ​​the first surface 121 is 1% or more and 20% or less. Similarly, the ratio of the area where the second protrusion 122T contacts the second surface 122 to the surface area of ​​the second surface 122 is 1% or more and 20% or less. If the area ratio is less than 1%, it may not be possible to prevent direct contact between the first surfaces 121 or the second surfaces 122 of the multiple sealing bodies 12, resulting in poor anti-adhesion performance. If the area ratio is greater than 20%, the first protrusion 121T and the second protrusion 122T also tend to stick together, which is not preferable.

[0056] (Example)

[0057] Production Figures 3 to 5 The sealing body 12 is shown. The sealing body 12 has a diameter of 9.8 mm, a height of 2.7 mm, and a through hole 124 with a diameter of 1.4 mm. The distance between the center lines of the two through holes 124 is 5.3 mm. Two first protrusions 121T (121T1, 121T2) are formed on the first surface 121. The height h1 of the first protrusion 121T is 0.08 mm, the width w1 is 0.4 mm, the diameter D1 of the first protrusion 121T1 is 8 mm, and the diameter D2 of the first protrusion 121T2 is 2 mm. A second protrusion 122T is formed on the second surface 122. The height h2 of the second protrusion 122T is 0.04 mm, the width w2 is 0.4 mm, and the diameter D3 is 8 mm.

[0058] The experiment found that even when multiple sealing bodies 12 were placed inside the packaging bag, no adhesion was found between the multiple sealing bodies 12.

[0059] (Modified example)

[0060] In the above embodiment, the top view shape of the first protrusion 121T and the second protrusion 122T is formed as a ring shape. However, the top view shape of the first protrusion 121T and the second protrusion 122T can also be formed as other shapes such as elliptical, spiral, or lattice.

[0061] In the above embodiment, the cross-sectional shape of the first protrusion 121T and the second protrusion 122T is formed as an arc shape. However, the cross-sectional shape of the first protrusion 121T and the second protrusion 122T can also be formed as a hemispherical shape, a rectangular shape, or other shapes. It should be noted that it is preferable that the front end of the cross-sectional shape of the first protrusion 121T and the second protrusion 122T has an arc shape. This is because if the cross-sectional shape of the first protrusion 121T and the second protrusion 122T is a flat shape at the front end, the contact area between the first protrusion 121T or the second protrusion 122T of the multiple sealing bodies 12 becomes larger, and the maximum anti-adhesion effect cannot be obtained.

[0062] In the above embodiment, two first protrusions 121T are formed on the radially outer side and the radially inner side of the through-hole 124, and one second protrusion 122T is formed on the radially outer side of the through-hole 124. However, the positional relationship of the first protrusion 121T and the second protrusion 122T to the through-hole 124 is not limited thereto, as long as neither the first protrusion 121T nor the second protrusion 122T is in contact with the through-hole 124.

[0063] In the above embodiment, two first protrusions 121T are provided and arranged in a concentric circular shape, and one second protrusion 122T is provided. However, the number of the first protrusions 121T and the second protrusions 122T is not limited thereto, and can be three or more, as long as the ratio of the area of the first protrusion 121T in contact with the first face 121 to the surface area of the first face 121 and the ratio of the area of the second protrusion 122T in contact with the second face 122 to the surface area of the second face 122 are 1% or more and 20% or less. Further, the number of the first protrusions 121T and the second protrusions 122T can be the same. Furthermore, in the case where a plurality of first protrusions 121T and / or second protrusions 122T are provided, the arrangement shape of the first protrusions 121T and / or the second protrusions 122T can be other than the concentric circular shape, as needed.

[0064] In the above embodiment, the heights of the first protrusions 121T and the second protrusions 122T are different. However, the heights of the first protrusions 121T and the second protrusions 122T can be the same.

[0065] In the above embodiment, the widths of the first protrusions 121T and the second protrusions 122T are the same. However, the widths of the first protrusions 121T and the second protrusions 122T can be different.

[0066] As described above, the following matters are disclosed in the present specification.

[0067] (1) A sealing body for an electrolytic capacitor, having a first face, a second face on the opposite side of the first face, and a through-hole passing through the first face to the second face, characterized in that,

[0068] a first protrusion is formed on the first face, and a second protrusion is formed on the second face,

[0069] the first protrusion and the second protrusion are not in contact with the through-hole.

[0070] (2) The sealing body for an electrolytic capacitor according to (1), characterized in that,

[0071] the height of each of the first protrusion and the second protrusion is 0.01 mm or more and 0.10 mm or less.

[0072] (3) The sealing body for an electrolytic capacitor according to (1) or (2), characterized in that

[0073] The first protrusion has a circular ring shape when viewed from a direction perpendicular to the first face,

[0074] The second protrusion has a circular ring shape when viewed from a direction perpendicular to the second face.

[0075] (4) The sealing body for an electrolytic capacitor according to (1) or (2), characterized in that

[0076] The leading end of the cross section of the first protrusion perpendicular to the first face has a circular arc shape,

[0077] The leading end of the cross section of the second protrusion perpendicular to the second face has a circular arc shape.

[0078] (5) The sealing body for an electrolytic capacitor according to (1), characterized in that

[0079] The ratio of the area where the first protrusion and the first face meet to the surface area of the first face is 1% or more and 20% or less.

[0080] (6) The sealing body for an electrolytic capacitor according to (1) or (5), characterized in that

[0081] The ratio of the area where the second protrusion and the second face meet to the surface area of the second face is 1% or more and 20% or less.

[0082] (7) The sealing body for an electrolytic capacitor according to (1) or (2), characterized in that

[0083] The number of the first protrusions is different from the number of the second protrusions.

[0084] (8) The sealing body for an electrolytic capacitor according to (1) or (2), characterized in that

[0085] The height of the first protrusions is different from the height of the second protrusions.

[0086] (9) The sealing body for an electrolytic capacitor according to (1), characterized in that

[0087] The first protrusions are formed in a plurality,

[0088] The plurality of first protrusions are arranged in a concentric circular shape when viewed from a direction perpendicular to the first face.

[0089] (10) The sealing body for an electrolytic capacitor according to (1) or (9), characterized in that

[0090] The second protrusions are formed with a plurality of

[0091] The plurality of second protrusions are arranged in a concentric circular shape when viewed from a direction perpendicular to the second surface.

[0092] (11) An electrolytic capacitor characterized by comprising:

[0093] a capacitor element including a lead terminal;

[0094] an electrolyte that impregnates the capacitor element;

[0095] a case that houses the capacitor element and the electrolyte; and

[0096] the electrolytic capacitor sealing body of any one of (1) to (10),

[0097] the electrolytic capacitor sealing body seals an opening of the case in a manner that either the first surface or the second surface faces inside the case,

[0098] the lead terminal of the capacitor element is arranged in the through-hole of the electrolytic capacitor sealing body.

[0099] The above, for the preferred embodiments of the present disclosure shown, but the present disclosure is not limited to the above-mentioned embodiments, in the scope of the present disclosure can be of course variously altered. In particular, without departing from the spirit and teachings of the present disclosure, the features recorded in each embodiment and / or technical solution of the present disclosure can be combined and / or combined in a variety of ways. All these combinations and / or combinations fall within the scope of the present disclosure.

Claims

1. A seal body for an electrolytic capacitor, having a first face, a second face opposite to the first face, and a through-hole passing through from the first face to the second face, characterized in that, a first protrusion is formed on the first face, and a second protrusion is formed on the second face, the first protrusion and the second protrusion do not contact the through-hole.

2. The seal body for an electrolytic capacitor according to claim 1, characterized in that, a height of each of the first protrusion and the second protrusion is 0.01 mm or more and 0.10 mm or less.

3. The seal body for an electrolytic capacitor according to claim 1 or 2, characterized in that, the first protrusion has a circular ring shape when viewed in a direction perpendicular to the first face, the second protrusion has a circular ring shape when viewed in a direction perpendicular to the second face.

4. The seal body for an electrolytic capacitor according to claim 1 or 2, characterized in that, a front end of a cross section of the first protrusion perpendicular to the first face has a circular arc shape, a front end of a cross section of the second protrusion perpendicular to the second face has a circular arc shape.

5. The seal body for an electrolytic capacitor according to claim 1, characterized in that, a ratio of an area where the first protrusion contacts the first face to a surface area of the first face is 1% or more and 20% or less.

6. The seal body for an electrolytic capacitor according to claim 1 or 5, characterized in that, a ratio of an area where the second protrusion contacts the second face to a surface area of the second face is 1% or more and 20% or less.

7. The seal body for an electrolytic capacitor according to claim 1 or 2, characterized in that, a number of the first protrusions is different from a number of the second protrusions.

8. The seal body for an electrolytic capacitor according to claim 1 or 2, characterized in that, a height of the first protrusion is different from a height of the second protrusion.

9. The seal body for an electrolytic capacitor according to claim 1, characterized in that, a plurality of the first protrusions are formed, the plurality of the first protrusions are arranged in a concentric circle shape when viewed in a direction perpendicular to the first face.

10. The seal body for an electrolytic capacitor according to claim 1 or 9, characterized in that, a plurality of the second protrusions are formed, the plurality of the second protrusions are arranged in a concentric circle shape when viewed in a direction perpendicular to the second face. a capacitor element including a lead terminal; an electrolytic solution impregnating the capacitor element; a case housing the capacitor element and the electrolytic solution; and the seal body for an electrolytic capacitor according to any one of claims 1 to 10, the seal body for an electrolytic capacitor closes an opening of the case from either the first face or the second face into the case, the lead terminal of the capacitor element is arranged in the through-hole of the seal body for an electrolytic capacitor. ​ ​ ​ ​ ​ ​ ​ ​ ​ 11. An electrolytic capacitor characterized by comprising: ​ ​ ​ ​ ​ ​ ​ ​

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