WO2020059091A1 - 電解コンデンサ - Google Patents
電解コンデンサ Download PDFInfo
- Publication number
- WO2020059091A1 WO2020059091A1 PCT/JP2018/034885 JP2018034885W WO2020059091A1 WO 2020059091 A1 WO2020059091 A1 WO 2020059091A1 JP 2018034885 W JP2018034885 W JP 2018034885W WO 2020059091 A1 WO2020059091 A1 WO 2020059091A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrolytic capacitor
- sealing body
- fat
- capacitor according
- electrolytic
- Prior art date
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Classifications
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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
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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
- H01G9/15—Solid electrolytic capacitors
- H01G9/151—Solid electrolytic capacitors with wound foil electrodes
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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
-
- 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
- H01G9/02—Diaphragms; Separators
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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
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
- H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
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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
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
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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
- H01G9/10—Sealing, e.g. of lead-in wires
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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
- H01G9/145—Liquid electrolytic capacitors
Definitions
- the present invention relates to an electrolytic capacitor sealed by a sealing body.
- Patent Document 1 A conventional electrolytic capacitor is disclosed in Patent Document 1.
- This electrolytic capacitor includes a main body case, a capacitor element, and a sealing body.
- the main body case is formed in a cylindrical shape with a bottom with metal, and has a cylindrical peripheral wall closed at one end and an opening at the other end.
- the capacitor element is wound around a separator with an anode foil and a cathode foil on which an oxide film is formed, and is housed in a main body case.
- An electrolytic solution is held between the anode foil and the cathode foil.
- Lead terminals are connected to the anode foil and the cathode foil, respectively.
- the opening of the main body case containing the capacitor element is sealed by a sealing body such as rubber, and the lead terminals are drawn out of the main body case through the sealing body.
- Patent Document 2 discloses an electrolytic capacitor having a solid electrolyte instead of an electrolytic solution.
- This electrolytic capacitor includes a main body case, a capacitor element, and a sealing body similar to those in Patent Document 1.
- a conductive polymer which is a solid electrolyte, is held between the anode foil and the cathode foil of the capacitor element. Further, a hydrophilic polymer compound containing water is held between the anode foil and the cathode foil.
- the ESR can be reduced by the conductive polymer.
- the defects contained in the oxide films of the anode foil and the cathode foil can be repaired by the moisture contained in the hydrophilic polymer compound.
- electrolytic capacitors have been increasingly used in high-temperature environments arranged near motors, engines, high-speed processing semiconductor elements, and the like that generate large heat due to miniaturization and high performance of mounted devices. .
- the antioxidant mixed in the sealing body is consumed as the antioxidant effect is achieved, and is gradually lost.
- the sealing body rapidly deteriorates with the disappearance of the antioxidant. For this reason, the electrolyte often evaporates out of the main body case, and eventually becomes a state called dry-up. Therefore, there has been a problem that the characteristics of the electrolytic capacitor cannot be stably maintained for a long period of time.
- the capacitor element retains a functional liquid that has the function of improving the characteristics of the electrolytic capacitor, not only water for repairing the oxide film, but also the functional liquid due to the deterioration of the sealing body in a high-temperature environment Get out. As a result, there is a problem that the characteristics of the electrolytic capacitor cannot be stably maintained for a long time.
- An object of the present invention is to provide an electrolytic capacitor capable of maintaining its characteristics stably for a long period of time.
- the present invention provides a capacitor element in which a predetermined solution is held between the anode foil and the cathode foil by winding an anode foil and a cathode foil via a separator, and the capacitor element
- a predetermined solution is held between the anode foil and the cathode foil by winding an anode foil and a cathode foil via a separator
- the capacitor element In an electrolytic capacitor including a main body case to be stored and a sealing body for sealing the main body case, the solution has a lipophilic antioxidant dissolved in a lipophilic solvent, and the separator contacts the sealing body. It is characterized by:
- the capacitor element holds a solid electrolyte.
- the present invention is also characterized in that in the electrolytic capacitor having the above-mentioned structure, the solution comprises an electrolytic solution obtained by dissolving the lipophilic antioxidant and an electrolyte in the lipophilic solvent.
- the present invention is also characterized in that in the electrolytic capacitor having the above-mentioned structure, the concentration of the fat-soluble antioxidant in the electrolytic solution is 1% by weight to 30% by weight.
- the concentration of the fat-soluble antioxidant in the electrolytic solution is 3% by weight to 20% by weight.
- the present invention is also characterized in that the lipophilic solvent is gamma-butyrolactone in the electrolytic capacitor having the above configuration.
- the present invention is also characterized in that in the electrolytic capacitor having the above configuration, the lipophilic solvent contains at least one of sulfolane, ethylene glycol, and diethylene glycol, and a nonionic surfactant.
- the present invention is also characterized in that, in the electrolytic capacitor having the above-mentioned configuration, the nonionic surfactant is obtained by binding a lipophilic group to polyethylene glycol or polyglycerin.
- the present invention is also characterized in that, in the electrolytic capacitor having the above-mentioned configuration, the nonionic surfactant is a polyethylene glycol-polypropylene glycol copolymer.
- the present invention is also characterized in that the fat-soluble antioxidant is a fat-soluble vitamin in the electrolytic capacitor having the above configuration.
- the present invention is also characterized in that in the electrolytic capacitor having the above-mentioned configuration, the fat-soluble vitamin is tocopherol or tocotrienol.
- the width in the short direction of the separator is larger than the width in the short direction of the anode foil and the cathode foil, and the separator is larger than the anode foil and the cathode foil. It is characterized in that it protrudes toward the sealing body and comes into contact with the sealing body.
- the main body case has a protruding portion that protrudes on an inner surface and presses an outer peripheral surface of the sealing body, and a vertex of the protruding portion is a center in a thickness direction of the sealing body. It is characterized by being arranged on a side farther from the capacitor element than the capacitor element.
- the lipophilic antioxidant is continuously supplied to the sealing body by the separator.
- the fat-soluble antioxidant supplied to the sealing body reaches the inside of the sealing body and the outer surface of the sealing body through the intermolecular gap inside the sealing body.
- the fat-soluble antioxidant covers the surface of the sealing body in the form of an oil film, and the deterioration of the sealing body can be suppressed for a long time. Therefore, it is possible to prevent the solution held in the capacitor element from leaking out, and to stably maintain the characteristics of the electrolytic capacitor for a long period of time.
- FIG. 2 is a perspective view of the electrolytic capacitor according to the first embodiment of the present invention as viewed from above.
- FIG. 2 is a perspective view of the electrolytic capacitor according to the first embodiment of the present invention as viewed from below.
- 1 is a perspective view showing a capacitor element of an electrolytic capacitor according to a first embodiment of the present invention.
- the electrolytic capacitor 1 includes a capacitor body 2 and a seat plate 6.
- the seat plate 6 is formed of a synthetic resin and holds the capacitor body 2.
- the seat plate 6 is provided with a pair of through holes 6a and 6b. Lead terminals 7 and 8 provided on a capacitor body 2 described later are bent by being inserted into through holes 6a and 6b and soldered to a circuit board.
- FIG. 3 is a front sectional view of the capacitor body 2.
- the capacitor main body 2 includes a main body case 3, a capacitor element 10, and a sealing body 5.
- the main body case 3 is formed of a metal such as aluminum into a cylindrical shape with a circular cross section and has an opening 3c at one end.
- the capacitor element 10 is housed in the main body case 3, and the opening 3 c is sealed by the sealing body 5.
- FIG. 4 is a perspective view of the capacitor element 10.
- the capacitor element 10 has an anode foil 11, a cathode foil 12, and a separator 13.
- the anode foil 11 and the cathode foil 12 are each formed in a long strip shape by a metal foil.
- the separator 13 is formed in a long band shape using a nonwoven fabric or the like.
- the capacitor element 10 is formed by winding an anode foil 11 and a cathode foil 12 in a cylindrical shape with a separator 13 interposed therebetween.
- the end of the anode foil 11 or the cathode foil 12 is fixed by a wrapping tape 14.
- the lead terminal 7 is connected to the anode foil 11, and the lead terminal 8 is connected to the cathode foil 12.
- the width in the short direction (axial direction) of the separator 13 is formed larger than the width in the short direction of the anode foil 11 and the cathode foil 12.
- the separator 13 projects upward (opposite to the opening 3c) and downward (toward the opening 3c) with respect to the anode foil 11 and the cathode foil 12, thereby preventing a short circuit between the anode foil 11 and the cathode foil 12.
- the anode foil 11 is made of a valve metal such as aluminum, tantalum, niobium, and titanium.
- the cathode foil 12 faces the anode foil 11 via the separator 13 and is formed of aluminum or the like.
- An oxide film (not shown) is formed on the surfaces of the anode foil 11 and the cathode foil 12.
- An electrolytic solution is held between the anode foil 11 and the cathode foil 12 of the capacitor element 10.
- the electrolyte permeates the separator 13 and is held between the anode foil 11 and the cathode foil 12.
- the electrolyte functions substantially as a cathode. Further, defects of the oxide films of the anode foil 11 and the cathode foil 12 can be repaired by the electrolytic solution.
- Electrolyte solution consists of solution of electrolyte in lipophilic solvent.
- Gamma-butyrolactone can be used as the lipophilic solvent.
- a liquid containing a nonionic surfactant in at least one of sulfolane, ethylene glycol, and diethylene glycol can be used.
- the nonionic surfactant polyethylene glycol or polyglycerin having a lipophilic group bonded thereto, a polyethylene glycol-polypropylene glycol copolymer, or the like can be used.
- the electrolyte dissociates into ions when dissolved in a solvent to exhibit electrical conductivity, and an organic amine salt of a boric acid compound or a carboxylic acid compound is used.
- the electrolyte solution contains a fat-soluble antioxidant dissolved in a lipophilic solvent.
- the fat-soluble antioxidant causes an oxidation reaction with oxygen, and suppresses the oxidation of the sealing body 5 as described in detail later.
- an antioxidant soluble in a lipophilic solvent is used, and for example, a fat-soluble vitamin can be used.
- fat-soluble vitamins vitamin A (retinol, ⁇ -carotene, ⁇ -carotene, ⁇ -cryptoxanthin), vitamin D (vitamin D2, vitamin D3), vitamin E (tocopherol, tocotrienol), vitamin K (vitamin K1, vitamin K2) And menaquinone 7).
- the concentration of the fat-soluble antioxidant in the electrolyte is less than 1% by weight, the effect of suppressing the oxidation of the sealing body 5 cannot be continued for a long time. If the concentration of the fat-soluble antioxidant in the electrolytic solution exceeds 30% by weight, the viscosity of the electrolytic solution increases, so that the time for which the capacitor element 10 holds the electrolytic solution is long, and the number of steps is increased. For this reason, it is desirable that the concentration of the fat-soluble antioxidant in the electrolyte be 1% by weight to 30% by weight. Further, it is more preferable that the concentration of the fat-soluble antioxidant in the electrolytic solution be 3% by weight to 20% by weight, because the effect of suppressing oxidation can be more exerted and the number of steps can be reduced.
- the sealing body 5 is formed in a disc shape having a pair of through holes 5a and 5b by a molded product of an elastic material such as rubber or the like.
- the lead terminals 7 and 8 of the capacitor element 10 are inserted into the through holes 5a and 5b by press fitting.
- the sealing member 5 butyl rubber having high environmental resistance such as heat aging resistance, chemical resistance, light resistance and the like, and high electric insulation properties and low gas permeability can be used. Further, the sealing body 5 may contain an antioxidant for suppressing deterioration.
- the sealing body 5 arranged in the opening 3 c of the main body case 3 With the sealing body 5 arranged in the opening 3 c of the main body case 3, the opening end of the main body case 3 is folded over the sealing body 5. Further, the main body case 3 is subjected to a drawing process for pressing the outer peripheral surface, and a projecting portion 3 d protruding toward the inner surface side of the main body case 3 is formed. Thereby, the sealing element 5 is fixed together with the capacitor element 10 to prevent the sealing element 5 from falling off, and the opening 3 c of the main body case 3 is sealed by the sealing element 5.
- the apex of the protruding portion 3d is arranged on a side farther from the capacitor element 10 than the center of the sealing body 5 in the thickness direction.
- the outer peripheral surface of the sealing body 5 is pressed from below in the figure, and the upper surface (the capacitor element 10 side) of the sealing body 5 curves upward and the central portion protrudes toward the capacitor element 10 side.
- FIG. 5 is a detailed view of a portion H in FIG. At least a part of the separator 13 protruding below the anode foil 11 and the cathode foil 12 contacts the sealing body 5. At this time, since the central portion of the sealing body 5 is curved so as to protrude upward, the separator 13 surely contacts the sealing body 5 at a plurality of points or surfaces along the sealing body 5.
- a fat-soluble antioxidant of the electrolytic solution is continuously supplied to the sealing body 5 through the separator 13 which comes into contact with the sealing body 5.
- the fat-soluble antioxidant reaches the inside of the sealing body 5 and the outer surface of the sealing body 5 (the surface on the opposite side of the capacitor element 10) through the intermolecular gap inside the sealing body 5. Therefore, the outer surface of the sealing body 5 is covered with the fat-soluble antioxidant in an oil film state.
- fat-soluble antioxidants have a high boiling point and a low melting point (for example, tocopherol has a boiling point of 235 ° C. and a melting point of 3 ° C.). Therefore, evaporation of the fat-soluble antioxidant covering the surface of the sealing body 5 is suppressed. This allows the fat-soluble antioxidant to remain in a liquid state between 25 ° C. and 150 ° C. around room temperature, and to form a stable oil film state.
- the contact between the sealing body 5 and oxygen in the air is suppressed, and the fat-soluble antioxidant reacts with the surface or inside of the sealing body 5 by oxidation reaction with oxygen. Therefore, the deterioration of the sealing body 5 due to oxidation can be suppressed for a long time. For this reason, it is possible to prevent the electrolytic solution from evaporating through cracks or the like of the sealing body 5.
- FIG. 6 is a diagram showing a change in capacitance due to a durability test of the electrolytic capacitor 1 of the present embodiment.
- the vertical axis indicates the rate of change of capacitance (unit:%), and the horizontal axis indicates elapsed time.
- A denotes the electrolytic capacitor 1 of the present embodiment, in which gamma-butyrolactone is used as a lipophilic solvent for an electrolytic solution and tocopherol is used as a fat-soluble antioxidant.
- the concentration of the fat-soluble antioxidant in the electrolyte is 10% by weight.
- the sealing body 5 is formed of butyl rubber, and an anti-aging agent is added.
- B indicates the electrolytic capacitor of the comparative example, and the fat-soluble antioxidant is omitted from the electrolytic solution of the electrolytic capacitor 1 shown in A.
- FIG. 7 shows an image of the sealing body 5 of the electrolytic capacitor 1 shown in FIG.
- FIG. 8 shows a photographed image of the sealing body 5 of the electrolytic capacitor shown in FIG.
- the electrolytic capacitor 1 of the present embodiment had a luster in which the surface of the sealing body 5 was covered with a fat-soluble antioxidant in an oil film state after 1500 hours and 8000 hours. . That is, tocopherol evaporates slower than gamma-butyrolactone on the surface of the sealing body 5 and can stably maintain the oil film state of the fat-soluble antioxidant even in a high temperature range of 150 ° C. where the oxidative deterioration of the sealing body 5 is fast. I was
- the change rate of the capacitance is less than 20% after 8000 hours. Therefore, stable characteristics can be exhibited for a long time even in a high temperature environment. At this time, the ESR was also kept low, and there was no adverse effect of the fat-soluble antioxidant on the electrolyte in the electrolytic solution.
- the capacitor element 10 holds the electrolyte in which the lipophilic antioxidant is dissolved in the lipophilic solvent, and the separator 13 contacts the sealing body 5.
- the fat-soluble antioxidant in the electrolytic solution is continuously supplied to the sealing body 5 through the separator 13, and the deterioration of the sealing body 5 can be suppressed for a long time. Therefore, evaporation of the electrolytic solution held in the capacitor element 10 can be prevented, and the characteristics of the electrolytic capacitor 1 can be stably maintained for a long time.
- the concentration of the fat-soluble antioxidant in the electrolytic solution is 1% by weight to 30% by weight, an increase in man-hours can be suppressed, and the effect of suppressing the oxidation of the sealing body 5 can be continued for a long time.
- the concentration of the fat-soluble antioxidant in the electrolyte is 3% by weight to 20% by weight, the effect of suppressing oxidation can be further lengthened and the number of steps can be reduced.
- the lipophilic solvent of the electrolyte can be easily realized by gamma-butyrolactone.
- the lipophilic solvent of the electrolyte can be easily realized by a liquid containing at least one of sulfolane, ethylene glycol, and diethylene glycol and a nonionic surfactant.
- nonionic surfactant can be easily realized by a liquid in which a lipophilic group is bonded to polyethylene glycol or polyglycerin.
- the nonionic surfactant can be easily realized by a polyethylene glycol-polypropylene glycol copolymer.
- the fat-soluble antioxidant of the electrolytic solution can be easily realized by the fat-soluble vitamin.
- fat-soluble vitamins that dissolve in the lipophilic solvent of the electrolyte can be easily realized with tocopherol or tocotrienol.
- the separator 13 protrudes toward the sealing body 5 from the anode foil 11 and the cathode foil 12, the separator 13 can be easily brought into contact with the sealing body 5.
- the apex of the protruding portion 3 d protruding on the inner surface of the main body case 3 is arranged on a side farther from the capacitor element 10 than the center in the thickness direction of the sealing body 5.
- the central portion of the sealing body 5 projects toward the capacitor element 10, and the separator 13 reliably contacts the sealing body 5 at a plurality of points or surfaces along the sealing body 5.
- the capacitor element 10 holds a solid electrolyte (not shown) and a predetermined functional liquid instead of the electrolytic solution.
- Other parts are the same as in the first embodiment.
- the solid electrolyte is made of a conductive polymer or the like.
- the ESR of the electrolytic capacitor 1 can be reduced by the conductive polymer.
- the conductive polymer polythiophene, polypyrrole, a derivative thereof, or the like can be used, and polyethylene dioxythiophene is more preferable because of its high electrical conductivity.
- the solid electrolyte made of the conductive polymer can be held between the anode foil 11 and the cathode foil 12.
- a functional liquid having a function of increasing the withstand voltage is held between the anode foil 11 and the cathode foil 12.
- the functional liquid consists of a solution of a fat-soluble antioxidant in a lipophilic solvent.
- Gamma-butyrolactone can be used as the lipophilic solvent.
- a liquid containing a nonionic surfactant in at least one of sulfolane, ethylene glycol, and diethylene glycol can be used as the nonionic surfactant.
- polyethylene glycol or polyglycerin having a lipophilic group bonded thereto, a polyethylene glycol-polypropylene glycol copolymer, or the like can be used. With these lipophilic solvents, the withstand voltage can be increased and the fat-soluble antioxidant can be dissolved.
- the fat-soluble antioxidant an antioxidant soluble in a lipophilic solvent is used, and for example, a fat-soluble vitamin can be used.
- a fat-soluble vitamin can be used.
- vitamin A retinol, ⁇ -carotene, ⁇ -carotene, ⁇ -cryptoxanthin
- vitamin D vitamin D2, vitamin D3
- vitamin E tocopherol, tocotrienol
- vitamin K vitamin K1, vitamin K2
- menaquinone 7 menaquinone 7
- the functional liquid Since the solid electrolyte is swollen by the functional liquid, the degree of adhesion of the solid electrolyte to the anode foil 11 and the cathode foil 12 sandwiching the solid electrolyte increases. Thereby, the ESR of the electrolytic capacitor 1 can be reduced. Therefore, the functional liquid also has a function of reducing the ESR of the electrolytic capacitor 1.
- the separator 13 of the capacitor element 10 is in contact with the sealing body 5, and the fat-soluble antioxidant of the functional liquid is supplied to the sealing body 5 via the separator 13.
- the fat-soluble antioxidant reaches the inside of the sealing body 5 and the outer surface of the sealing body 5 (the surface on the opposite side of the capacitor element 10) through the intermolecular gap inside the sealing body 5. Therefore, the outer surface of the sealing body 5 is covered with the fat-soluble antioxidant in an oil film state.
- the contact between the sealing body 5 and oxygen in the air is suppressed, and the fat-soluble antioxidant reacts with the surface or inside of the sealing body 5 by oxidation reaction with oxygen. Therefore, the deterioration of the sealing body 5 due to oxidation can be suppressed, and the functional liquid can be prevented from falling out.
- the capacitor element 10 holds the functional liquid and the solid electrolyte in which the lipophilic antioxidant is dissolved in the lipophilic solvent, and the separator 13 contacts the sealing body 5.
- the fat-soluble antioxidant in the functional liquid is continuously supplied to the sealing body 5 via the separator 13, and the deterioration of the sealing body 5 can be suppressed for a long time. Therefore, it is possible to prevent the functional liquid held by the capacitor element 10 from leaking out, and to stably maintain the characteristics of the electrolytic capacitor 1 for a long period of time.
- an electrolytic solution obtained by dissolving an electrolyte in the functional liquid may be held between the anode foil 11 and the cathode foil 12.
- the function of repairing the oxide film can be enhanced, and the ESR of the electrolytic capacitor 1 can be further reduced.
- the present invention can be used for an electrolytic capacitor and an automobile, an electronic device, and the like in which the electrolytic capacitor is mounted on a control circuit.
- Electrolytic capacitor 1
- Capacitor main body 3
- Main body case 3c Opening 3d Projecting part 5
- Sealing body 5a, 5b Through hole 6
- Seat plate 6a, 6b Through hole 7 8
- Lead terminal 10
- Capacitor element 11
- Anode foil 12
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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
以下に図面を参照して本発明の実施形態を説明する。図1及び図2は第1実施形態の電解コンデンサ1を上方から見た斜視図及び下方から見た斜視図を示している。電解コンデンサ1はコンデンサ本体2と座板6とを備えている。座板6は合成樹脂により形成され、コンデンサ本体2を保持する。座板6には一対の貫通孔6a、6bが設けられる。後述するコンデンサ本体2に設けられたリード端子7、8は貫通孔6a、6bに挿通して折曲され、回路基板に半田付けされる。
次に、第2実施形態について説明する。本実施形態はコンデンサ素子10が電解液に替えて固体電解質(不図示)及び所定の機能性液体を保持する。その他の部分は第1実施形態と同様である。
2 コンデンサ本体
3 本体ケース
3c 開口部
3d 突出部
5 封口体
5a、5b 貫通孔
6 座板
6a、6b 貫通孔
7、8 リード端子
10 コンデンサ素子
11 陽極箔
12 陰極箔
13 セパレータ
14 テープ
Claims (13)
- セパレータを介して陽極箔と陰極箔とを巻回して前記陽極箔と前記陰極箔との間に所定の溶液を保持したコンデンサ素子と、前記コンデンサ素子を収納する本体ケースと、前記本体ケースを封止する封口体とを備えた電解コンデンサにおいて、前記溶液が親油性溶媒に脂溶性酸化防止剤を溶解されており、前記セパレータが前記封口体に接触することを特徴とする電解コンデンサ。
- 前記コンデンサ素子が固体電解質を保持することを特徴とする請求項1に記載の電解コンデンサ。
- 前記溶液が前記親油性溶媒に前記脂溶性酸化防止剤及び電解質を溶解した電解液から成ることを特徴とする請求項1または請求項2に記載の電解コンデンサ。
- 前記電解液中の前記脂溶性酸化防止剤の濃度が1重量%~30重量%であることを特徴とする請求項3に記載の電解コンデンサ。
- 前記電解液中の前記脂溶性酸化防止剤の濃度が3重量%~20重量%であることを特徴とする請求項3に記載の電解コンデンサ。
- 前記親油性溶媒がガンマブチロラクトンであることを特徴とする請求項1~請求項5のいずれかに記載の電解コンデンサ。
- 前記親油性溶媒が、スルホラン、エチレングリコール、ジエチレングリコールの少なくとも一つと、非イオン性界面活性剤とを含むことを特徴とする請求項1~請求項5のいずれかに記載の電解コンデンサ。
- 前記非イオン性界面活性剤がポリエチレングリコールまたはポリグリセリンに親油基を結合させたものであることを特徴とする請求項7に記載の電解コンデンサ。
- 前記非イオン性界面活性剤がポリエチレングリコール-ポリプロピレングリコール共重合体であることを特徴とする請求項7に記載の電解コンデンサ。
- 前記脂溶性酸化防止剤が脂溶性ビタミンであることを特徴とする請求項1~請求項9のいずれかに記載の電解コンデンサ。
- 前記脂溶性ビタミンがトコフェロールまたはトコトリエノールであることを特徴とする請求項10に記載の電解コンデンサ。
- 前記セパレータの短手方向の幅が前記陽極箔及び前記陰極箔の短手方向の幅よりも大きく、前記セパレータが前記陽極箔及び前記陰極箔よりも前記封口体側に突出して前記封口体に接触することを特徴とする請求項1~請求項11のいずれかに記載の電解コンデンサ。
- 前記本体ケースが内面上に突出して前記封口体の外周面を押圧する突出部を有し、前記突出部の頂点が前記封口体の厚み方向の中心よりも前記コンデンサ素子から離れた側に配されることを特徴とする請求項12に記載の電解コンデンサ。
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201880097841.5A CN112740346B (zh) | 2018-09-20 | 2018-09-20 | 电解电容器 |
| EP18934106.8A EP3855464B1 (en) | 2018-09-20 | 2018-09-20 | Electrolytic capacitor |
| US17/270,472 US11380493B2 (en) | 2018-09-20 | 2018-09-20 | Electrolytic capacitor |
| JP2020547554A JP7513265B2 (ja) | 2018-09-20 | 2018-09-20 | 電解コンデンサ |
| PCT/JP2018/034885 WO2020059091A1 (ja) | 2018-09-20 | 2018-09-20 | 電解コンデンサ |
| CN202310522067.0A CN116364438A (zh) | 2018-09-20 | 2018-09-20 | 电解电容器 |
| JP2023001795A JP7755320B2 (ja) | 2018-09-20 | 2023-01-10 | 電解コンデンサ |
| JP2024194618A JP2025016740A (ja) | 2018-09-20 | 2024-11-06 | コンデンサ |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/034885 WO2020059091A1 (ja) | 2018-09-20 | 2018-09-20 | 電解コンデンサ |
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| Publication Number | Publication Date |
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| WO2020059091A1 true WO2020059091A1 (ja) | 2020-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2018/034885 Ceased WO2020059091A1 (ja) | 2018-09-20 | 2018-09-20 | 電解コンデンサ |
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| Country | Link |
|---|---|
| US (1) | US11380493B2 (ja) |
| EP (1) | EP3855464B1 (ja) |
| JP (3) | JP7513265B2 (ja) |
| CN (2) | CN112740346B (ja) |
| WO (1) | WO2020059091A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021174944A (ja) * | 2020-04-28 | 2021-11-01 | ニチコン株式会社 | 電解液および電解コンデンサ |
| WO2023027059A1 (ja) | 2021-08-26 | 2023-03-02 | サン電子工業株式会社 | 電解コンデンサ |
| WO2024004571A1 (ja) | 2022-06-30 | 2024-01-04 | エルナー株式会社 | 電解コンデンサ、その製造方法、及び保持材 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4030452A4 (en) * | 2019-09-13 | 2023-06-14 | Sun Electronic Industries Corp. | CAPACITOR |
| US12387882B2 (en) * | 2020-02-28 | 2025-08-12 | Sun Electronic Industries Corp. | Electrolytic capacitor |
| US12386289B2 (en) * | 2021-09-13 | 2025-08-12 | Xerox Corporation | Release fluid additive |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3855464A4 (en) | 2022-04-27 |
| CN116364438A (zh) | 2023-06-30 |
| CN112740346B (zh) | 2023-04-25 |
| JP2025016740A (ja) | 2025-02-04 |
| EP3855464A1 (en) | 2021-07-28 |
| JPWO2020059091A1 (ja) | 2021-08-30 |
| US20210327653A1 (en) | 2021-10-21 |
| JP2023040185A (ja) | 2023-03-22 |
| JP7513265B2 (ja) | 2024-07-09 |
| JP7755320B2 (ja) | 2025-10-16 |
| EP3855464B1 (en) | 2025-09-03 |
| CN112740346A (zh) | 2021-04-30 |
| US11380493B2 (en) | 2022-07-05 |
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