WO2014068929A1 - Condensateur électrolytique - Google Patents

Condensateur électrolytique Download PDF

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Publication number
WO2014068929A1
WO2014068929A1 PCT/JP2013/006325 JP2013006325W WO2014068929A1 WO 2014068929 A1 WO2014068929 A1 WO 2014068929A1 JP 2013006325 W JP2013006325 W JP 2013006325W WO 2014068929 A1 WO2014068929 A1 WO 2014068929A1
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WO
WIPO (PCT)
Prior art keywords
groove
sealing member
electrolytic capacitor
tab terminal
lead tab
Prior art date
Application number
PCT/JP2013/006325
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English (en)
Japanese (ja)
Inventor
慎二 小寺
Original Assignee
三洋電機株式会社
佐賀三洋工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社, 佐賀三洋工業株式会社 filed Critical 三洋電機株式会社
Priority to JP2014544271A priority Critical patent/JP6191015B2/ja
Publication of WO2014068929A1 publication Critical patent/WO2014068929A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/12—Vents or other means allowing expansion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/10—Sealing, e.g. of lead-in wires

Definitions

  • the present invention relates to an electrolytic capacitor having an explosion-proof structure.
  • the electrolytic capacitor includes a capacitor element, a bottomed cylindrical outer case in which the capacitor element is accommodated, and a sealing member that seals an opening of the outer case (for example, see Patent Document 1).
  • gas may be generated in the outer case during operation or short-circuiting. This gas is, for example, an electrolyte that has evaporated due to heat generated when the electrolytic capacitor is operated or short-circuited. When gas is generated, the internal pressure of the electrolytic capacitor increases and the electrolytic capacitor may burst.
  • an explosion-proof structure for preventing the explosion of the electrolytic capacitor has been proposed.
  • a technique has been proposed in which a cross-shaped notch is provided on the outer surface of the bottom of the outer case, and the depth of the notch is adjusted so that gas can escape from the notch before the capacitor element ruptures (for example, Patent Documents). 2).
  • a technique of providing a gas vent valve or a pressure adjustment valve on the sealing member has been proposed (see, for example, Patent Document 3 or 4).
  • JP 2007-103532 A Japanese Utility Model Publication No. 48-53543 JP 2006-108185 A JP 2007-335775 A
  • the above-described conventional explosion-proof structure can be applied to a large electrolytic capacitor, but is difficult to apply to a small electrolytic capacitor mounted on an electronic device such as a mobile phone or a digital camera. .
  • a small electrolytic capacitor even if a cut is provided on the outer surface of the bottom of the outer case, it is difficult to accurately adjust the depth of the cut.
  • the sealing member is small, and therefore it is difficult to provide a gas vent valve or a pressure regulating valve for the sealing member.
  • an object of the present invention is to provide an electrolytic capacitor that exhibits high explosion-proof performance even if it is small.
  • a first electrolytic capacitor according to the present invention includes a capacitor element, a bottomed cylindrical outer case in which the capacitor element is accommodated, and a sealing member that is fitted into an opening of the outer case.
  • the capacitor element has an anode member, a cathode member, and a dielectric film formed on the surface of the anode member.
  • the sealing member has a side peripheral surface that comes into contact with the inner peripheral surface of the exterior case when the sealing member is inserted into the opening, and the side peripheral surface is directed from one of the upper edge and the lower edge toward the other. An extended groove or slit is formed. And in the state by which the sealing member was inserted by the opening part, at least one part of a groove
  • the second electrolytic capacitor according to the present invention includes a capacitor element, a bottomed cylindrical outer case in which the capacitor element is accommodated, and a sealing member that is fitted into an opening of the outer case.
  • the capacitor element has an anode member, a cathode member, and a dielectric film formed on the surface of the anode member.
  • the inner peripheral surface of the exterior case has an inner peripheral region in contact with the side peripheral surface of the sealing member, and at least the inner peripheral region extends from one of the upper edge and the lower edge toward the other. Grooves are formed. And at least one part of this groove
  • the electrolytic capacitor according to the present invention can exhibit high explosion-proof performance even if it is small.
  • FIG. 1 is a cross-sectional view showing an electrolytic capacitor according to a first embodiment of the present invention.
  • 2A is a perspective view and FIG. 2B is a top view showing the shape of the sealing member included in the electrolytic capacitor according to the first embodiment before being inserted into the outer case.
  • FIG. 3 is a sectional view taken along the line III-III shown in FIG.
  • FIG. 4 is a top view showing various modifications of the sealing member.
  • FIG. 5 is a top view showing another modification of the sealing member.
  • FIG. 7 is a diagram showing a part of a cross section obtained along the same line as the line III-III shown in FIG. 1 for the electrolytic capacitor according to the second embodiment.
  • FIG. 8 is a cross-sectional view showing various modifications of the exterior case.
  • FIG. 9 is a cross-sectional view showing a preferred positional relationship between the exterior case and the sealing member.
  • FIG. 1 is a cross-sectional view showing an electrolytic capacitor according to a first embodiment of the present invention.
  • the electrolytic capacitor includes a capacitor body 10 and a seat plate 40 on which the capacitor body 10 is mounted.
  • the capacitor body 10 includes a capacitor element 1, a bottomed cylindrical outer case 2 in which the capacitor element 1 is accommodated, and a sealing member 3 that is fitted into the opening 21 of the outer case 2. .
  • the capacitor element 1 has a wound body 11, an anode lead tab terminal 12, and a cathode lead tab terminal 13.
  • the wound body 11 is configured by overlapping and winding an anode foil, a cathode foil, and a separator.
  • Each of the anode foil and the cathode foil is formed of a valve metal such as aluminum, tantalum, or niobium.
  • a dielectric film is formed on the surface of the anode foil.
  • the separator is superimposed on the anode foil and the cathode foil so as to be interposed between the anode foil and the cathode foil in the wound body 11.
  • the separator is impregnated with a solid or liquid electrolyte, whereby the electrolyte is interposed between the dielectric coating and the cathode foil.
  • the wound body 11 may be formed by winding various forms of anode members and cathode members that are not limited to foil.
  • the anode lead tab terminal 12 is electrically connected to the anode foil
  • the cathode lead tab terminal 13 is electrically connected to the cathode foil.
  • the anode lead tab terminal 12 and the cathode lead tab terminal 13 are drawn from the lower end surface 11 a of the wound body 11. In the present embodiment, these lead positions are all shifted from the winding center position 11b, and the anode lead tab terminal 12 is the lead position of the cathode lead tab terminal 13 with respect to the winding center position 11b. It is pulled out from the opposite position.
  • the anode lead tab terminal 12 and the cathode lead tab terminal 13 penetrate the sealing member 3. Thereby, the capacitor element 1 is fixed to the sealing member 3, and the lead portion 121 of the anode lead tab terminal 12 and the lead portion 131 of the cathode lead tab terminal 13 are drawn out of the outer case 2.
  • Each of the lead portions 121 and 131 penetrates the seat plate 40 and is bent so that the tip portion is along the lower surface 40 a of the seat plate 40. In this way, the external terminals of the electrolytic capacitor are formed by the portions of the lead portions 121 and 131 that are present on the lower surface 40a of the seat plate 40.
  • the outer case 2 is made of a metal material such as aluminum.
  • the opening portion 21 of the outer case 2 is formed with a throttle portion 22 for fixing the sealing member 3 to the outer case 2 by performing a horizontal drawing process on the opening portion 21.
  • the opening end of the outer case 2 is further curled.
  • the exterior case 2 is not limited to a metal material, and may be formed from various materials including an electrical insulating material.
  • the sealing member 3 is made of an elastic material such as rubber.
  • the narrowed portion 22 compresses the sealing member 3 from the periphery to the inside. Thereby, the sealing member 3 is elastically deformed, and the side peripheral surface 3 a thereof is in close contact with the inner peripheral surface 2 a of the exterior case 2. In this way, the opening 21 of the outer case 2 is sealed by the sealing member 3.
  • FIG. 2A and 2 (b) are a perspective view and a top view showing the shape of the sealing member 3 before being inserted into the opening 21 of the exterior case 2, respectively.
  • a groove 31 extending vertically from the upper end edge 3b to the lower end edge 3c is formed on the side peripheral surface 3a of the sealing member 3.
  • the groove 31 is a V-shaped groove as shown in FIG. Specifically, the cross section of the groove 31 perpendicular to the extending direction of the groove 31 is V-shaped. In the state where the sealing member 3 is inserted into the opening 21, the groove 31 is closed by the compression of the sealing member 3 by the throttle portion 22 as shown in FIG. 3.
  • the V-shaped groove 31 is easily closed without a gap when the sealing member 3 is inserted into the opening 21. Therefore, high airtightness is realized in the electrolytic capacitor according to the first embodiment.
  • channel 31 does not need to be completely obstruct
  • the electrolytic capacitor according to the first embodiment when gas is generated in the outer case 2 and the internal pressure of the electrolytic capacitor increases, the closed portion of the groove 31 is expanded by the internal pressure. Thereby, the gas in the exterior case 2 is discharged to the outside through the groove 31, and as a result, an increase in internal pressure is suppressed.
  • the electrolytic capacitor according to the first embodiment can exhibit high explosion-proof performance.
  • the electrolytic capacitor according to the first embodiment has reproducibility with respect to its airtightness and explosion-proof performance.
  • the groove 31 can be easily formed on the sealing member 3 even when the electrolytic capacitor is small and the sealing member 3 is small.
  • FIG. 4 (a) to 4 (c) are top views showing various modified examples of the sealing member 3.
  • FIG. The groove 31 may be a groove having a flat bottom as shown in FIG. 4A, or may be a groove having a curved bottom as shown in FIG. 4B.
  • slits 32 may be formed on the side peripheral surface 3 a of the sealing member 3 instead of the grooves 31.
  • the V-shaped groove 31 (FIG. 2B) and the slit 32 are preferable because they are easily closed without a gap when the sealing member 3 is inserted into the opening 21, and the V-shaped groove is preferable. 31 is particularly preferred.
  • the depth of the groove 31 or the slit 32 is preferably smaller than the depth of the throttle portion 22.
  • this invention is not limited to this, The depth of the groove
  • FIG. 5 is a top view showing another modified example of the sealing member 3.
  • the groove 31 is preferably formed on the side peripheral surface 3 a of the sealing member 3 at a position in the vicinity of the through hole 33 into which the anode lead tab terminal 12 is inserted.
  • the groove 31 is preferably formed on the side peripheral surface 3a of the sealing member 3 at a position near the through hole 34 into which the cathode lead tab terminal 13 is inserted. That is, in the electrolytic capacitor, the groove 31 is preferably formed on the side peripheral surface 3 a of the sealing member 3 at a position near the anode lead tab terminal 12 or the cathode lead tab terminal 13. The reason is as follows. The same applies to the position where the slit 32 is formed.
  • the electrolytic capacitor When the electrolytic capacitor is short-circuited, a large amount of gas is generated in the outer case 2 due to a large amount of heat generated in the electrolytic capacitor. As a result, the internal pressure of the electrolytic capacitor rapidly increases, and a large pressure is applied to the sealing member 3 so that it can be removed from the outer case 2. At this time, since the gas is released through the groove 31, when the sealing member 3 is dropped from the outer case 2, the sealing member 3 is inclined starting from the position where the groove 31 is formed.
  • the groove 31 is formed at a position in the vicinity of the anode lead tab terminal 12 or the cathode lead tab terminal 13.
  • the sealing member 3 when the sealing member 3 is tilted, the anode lead tab terminal 12 or the cathode lead tab terminal 13 is largely tilted. As a result, the electrical connection between the anode foil and the anode lead tab terminal 12 or the cathode foil and the cathode lead tab terminal 13 is achieved. The electrical connection with is broken. Therefore, according to the electrolytic capacitor according to the above modification, the current path in the electrolytic capacitor can be disconnected at the time of the short circuit, thereby preventing the heat generation due to the short circuit.
  • the sealing member 3 is largely inclined. Therefore, the groove 31 is located on the opposite side of the through hole 33 from the central position 3d of the sealing member 3 (FIG. 5) or on the opposite side of the through hole 34 from the central position 3d of the sealing member 3. It is particularly preferable that the sealing member 3 is formed on the side peripheral surface 3a.
  • each part structure of this invention is not restricted to 1st Embodiment, A various deformation
  • the shape of the groove 31 is not limited to a V shape, a shape with a flat bottom surface, or a shape with a curved bottom surface, and various shapes may be employed.
  • the groove 31 is not limited to the one extending vertically from the upper end edge 3b to the lower end edge 3c of the side peripheral surface 3a, but may be one extending obliquely from the upper end edge 3b to the lower end edge 3c.
  • the groove 31 is not limited to the one extending from the upper end edge 3b to the lower end edge 3c, but is interrupted at a position between the upper end edge 3b and the lower end edge 3c while extending from the upper end edge 3b or the lower end edge 3c. There may be. Furthermore, the number of the grooves 31 is not limited to one, and a plurality of grooves 31 may be formed on the side peripheral surface 3a.
  • FIGS. 6A and 6B are a perspective view and a cross-sectional view showing a shape of the main part of the outer case 2 before the lateral drawing and curling, respectively.
  • the inner peripheral surface 2 a of the outer case 2 has an inner peripheral region 2 b in contact with the side peripheral surface 3 a of the sealing member 3.
  • the inner peripheral surface 2a is formed with a groove 23 that intersects the inner peripheral region 2b and extends vertically.
  • channel 23 is a groove
  • the sealing member 3 In a state where the sealing member 3 is inserted into the opening portion 21, as shown in FIG. 7, the sealing member 3 is compressed by the throttle portion 22, so that a part of the sealing member 3 enters the groove 23. As a result, a part of the groove 23 is closed by the sealing member 3.
  • the groove 23 having a curved bottom surface is easily closed by the sealing member 3 without a gap when a part of the sealing member 3 enters the inside. Therefore, high airtightness is realized in the electrolytic capacitor according to the second embodiment.
  • channel 23 does not need to be completely obstruct
  • the electrolytic capacitor according to the second embodiment when gas is generated in the outer case 2 and the internal pressure of the electrolytic capacitor is increased, the sealing member 3 entering the inside of the groove 23 is pushed away by the internal pressure. Thereby, the gas in the exterior case 2 is discharged to the outside through the groove 23, and as a result, an increase in internal pressure is suppressed.
  • the electrolytic capacitor according to the second embodiment can exhibit high explosion-proof performance.
  • the electrolytic capacitor according to the second embodiment has reproducibility with respect to its airtightness and explosion-proof performance.
  • the groove 23 can be easily formed in the outer case 2 even when the electrolytic capacitor is small and the outer case 2 is small.
  • FIG. 8A and FIG. 8B are cross-sectional views showing various modified examples of the outer case 2.
  • the groove 23 may be a V-shaped groove as shown in FIG. 8A, or may be a groove having a flat bottom surface as shown in FIG. 8B.
  • the groove 23 having a curved bottom surface is particularly preferable because it is easily closed without a gap by the sealing member 3 when the sealing member 3 is inserted into the opening 21.
  • the depth of the groove 23 is smaller than the depth of the throttle portion 22.
  • the present invention is not limited to this, and the depth of the groove 23 can be adjusted according to the material of the sealing member 3, the shape of the groove 23, and the like. Alternatively or in addition, the depth of the throttle portion 22 may be adjusted.
  • FIG. 9 is a cross-sectional view showing a preferred positional relationship between the outer case 2 and the sealing member 3.
  • the electrolytic capacitor When the electrolytic capacitor is short-circuited, a large amount of gas is generated in the outer case 2 due to a large amount of heat generated in the electrolytic capacitor. As a result, the internal pressure of the electrolytic capacitor rapidly increases, and a large pressure is applied to the sealing member 3 so that it can be removed from the outer case 2. At this time, since the gas is released through the groove 23, when the sealing member 3 is detached from the exterior case 2, the sealing member 3 is inclined with the position of the groove 23 as a starting point.
  • the groove 23 is disposed at a position in the vicinity of the anode lead tab terminal 12 or the cathode lead tab terminal 13.
  • the sealing member 3 is largely inclined. Therefore, the groove 23 is disposed at a position opposite to the center position 3d of the sealing member 3 with respect to the anode lead tab terminal 12 (FIG. 9) or the center of the sealing member 3 with respect to the cathode lead tab terminal 13. It is particularly preferable to adjust the positional relationship between the outer case 2 and the sealing member 3 so as to be disposed at a position opposite to the position 3d.
  • each part structure of this invention is not restricted to the said embodiment, A various deformation
  • the shape of the groove 23 is not limited to a shape in which the bottom surface is curved, a shape in which the bottom surface is flat, or a V shape, and various shapes may be employed.
  • channel 23 should just be formed in the internal peripheral area
  • the groove 23 is not limited to the one extending vertically, but may be one extending obliquely.
  • the groove 23 is not limited to the one extending from the upper end edge to the lower end edge of the inner peripheral region 2b, but is interrupted at a position between the upper end edge and the lower end edge while extending from the upper end edge or the lower end edge. There may be.
  • the number of grooves 23 is not limited to one, and a plurality of grooves 23 may be formed in the inner peripheral region 2b.
  • the inventor of the present application manufactured an electrolytic capacitor (rated voltage: 16 V, capacitance: 39 ⁇ F) under the following conditions (first example). That is, in the capacitor element 1, aluminum foil was used as the anode foil and the cathode foil, and a conductive polymer made of polythiophene was used as the electrolyte. As the outer case 2, an aluminum can having a diameter of 6.3 mm and a height of 6.0 mm was used. Butyl rubber was used as an elastic material constituting the sealing member 3, and a groove 31 having a V shape and a depth of 0.2 mm was formed on the side peripheral surface 3 a of the sealing member 3.
  • the groove 31 was formed at a position opposite to the center position 3d of the sealing member 3 with respect to the through hole 33 into which the anode lead tab terminal 12 was inserted.
  • the outer case 2 was subjected to a horizontal drawing process to form a drawn portion 22 having a depth of 0.45 mm.
  • the inventor of the present application manufactured an electrolytic capacitor (rated voltage 16 V, capacitance 39 ⁇ F) under the following conditions as an example of the second embodiment (second example). That is, in the capacitor element 1, aluminum foil was used as the anode foil and the cathode foil, and a conductive polymer made of polythiophene was used as the electrolyte. An aluminum can having a diameter of 6.3 mm and a height of 6.0 mm is used as the outer case 2, and the inner peripheral surface 2 a of the outer case 2 has a curved bottom surface and a depth of A groove 23 of 0.2 mm was formed. Butyl rubber was used as an elastic material constituting the sealing member 3.
  • the outer case 2 was subjected to a horizontal drawing process to form a drawn portion 22 having a depth of 0.45 mm.
  • the outer casing 2 and the sealing member 3 are arranged such that the groove 23 is disposed at a position opposite to the center position 3d of the sealing member 3 with respect to the through hole 33 into which the anode lead tab terminal 12 is inserted. The positional relationship was adjusted.
  • the inventors of the present application produced an electrolytic capacitor having no groove 31 in the sealing member 3 as a conventional electrolytic capacitor in the first embodiment (conventional example).
  • the present inventor prepared 10 electrolytic capacitors of the first and second embodiments and the conventional example. For these electrolytic capacitors, it was confirmed to what extent the phenomenon that the current path was broken at the time of short-circuiting occurred. As a condition at this time, each electrolytic capacitor was short-circuited by applying a DC voltage of 80 V (current 0.5 A) thereto, and then a 5 A energizing current was passed through the electrolytic capacitor.
  • the current path can be reliably disconnected at the time of a short circuit, and this has been confirmed by the above test.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

La présente invention se rapporte à un condensateur électrolytique qui comprend un élément de condensateur (1), un boîtier extérieur en forme de cylindre avec fond (2) qui contient l'élément de condensateur (1), et un élément d'étanchéité (3) inséré dans une section ouverture (21) du boîtier extérieur (2). L'élément d'étanchéité (3) comporte une surface périphérique latérale (3a) qui vient en contact avec la surface périphérique interne du boîtier extérieur (2), ledit élément d'étanchéité étant inséré dans la section ouverture (21) ; sur la surface périphérique latérale (3a), il est formé une rainure ou une fente qui s'étend soit depuis un bord supérieur, soit depuis un bord inférieur de cette dernière vers l'autre bord. Au moins une partie de la rainure ou de la fente est fermée une fois que l'élément d'étanchéité (2) a été inséré dans la section ouverture (21). En variante, il est formé, sur une région périphérique interne de la surface périphérique interne (2a) du boîtier extérieur (2), une rainure qui s'étend soit depuis le bord supérieur, soit depuis un bord inférieur de cette dernière vers l'autre bord, la région périphérique interne venant en contact avec la surface périphérique latérale (3a) de l'élément d'étanchéité (3). Au moins une partie de la rainure est fermée par une partie de l'élément d'étanchéité (3) qui entre dans cette dernière.
PCT/JP2013/006325 2012-10-31 2013-10-25 Condensateur électrolytique WO2014068929A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014544271A JP6191015B2 (ja) 2012-10-31 2013-10-25 電解コンデンサ

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JP2012-240616 2012-10-31
JP2012240616 2012-10-31

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WO2014068929A1 true WO2014068929A1 (fr) 2014-05-08

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105702468A (zh) * 2016-03-31 2016-06-22 上海永铭电子有限公司 一种小体积、低成本的贴片式铝电解电容

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439234A (en) * 1966-12-05 1969-04-15 Mallory & Co Inc P R Self-venting housing for capacitors
JPS5497771A (en) * 1978-01-03 1979-08-02 Siemens Ag Condenser
JPS5778570U (fr) * 1980-10-31 1982-05-14

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH426015A (de) * 1964-11-26 1966-12-15 Siemens Ag Explosionssicherer elektrischer Kondensator mit Abreisssicherung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439234A (en) * 1966-12-05 1969-04-15 Mallory & Co Inc P R Self-venting housing for capacitors
JPS5497771A (en) * 1978-01-03 1979-08-02 Siemens Ag Condenser
JPS5778570U (fr) * 1980-10-31 1982-05-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105702468A (zh) * 2016-03-31 2016-06-22 上海永铭电子有限公司 一种小体积、低成本的贴片式铝电解电容

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JPWO2014068929A1 (ja) 2016-09-08

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