WO2023027059A1 - 電解コンデンサ - Google Patents

電解コンデンサ Download PDF

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Publication number
WO2023027059A1
WO2023027059A1 PCT/JP2022/031677 JP2022031677W WO2023027059A1 WO 2023027059 A1 WO2023027059 A1 WO 2023027059A1 JP 2022031677 W JP2022031677 W JP 2022031677W WO 2023027059 A1 WO2023027059 A1 WO 2023027059A1
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WO
WIPO (PCT)
Prior art keywords
sealant
electrolytic capacitor
hydrophilic compound
deterioration inhibitor
electrolyte
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/031677
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English (en)
French (fr)
Japanese (ja)
Inventor
大和 錦織
隆志 竹澤
雅和 細木
忠仁 伊藤
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Sun Electronic Industries Corp
Original Assignee
Sun Electronic Industries Corp
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 Sun Electronic Industries Corp filed Critical Sun Electronic Industries Corp
Priority to EP22861347.7A priority Critical patent/EP4394832A4/en
Priority to US18/683,922 priority patent/US12573563B2/en
Priority to CN202280058060.1A priority patent/CN117882160A/zh
Priority to JP2023543924A priority patent/JP7761287B2/ja
Publication of WO2023027059A1 publication Critical patent/WO2023027059A1/ja
Anticipated expiration legal-status Critical
Priority to JP2025140656A priority patent/JP2025161943A/ja
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an electrolytic capacitor sealed with a sealing body.
  • Patent Document 1 A conventional electrolytic capacitor is disclosed in Patent Document 1.
  • This electrolytic capacitor includes a body case, a capacitor element and a sealing body.
  • the main body case is made of metal and formed into a cylindrical shape with a bottom.
  • a capacitor element is housed in a main body case by winding an anode foil and a cathode foil on which a dielectric oxide film is formed through a separator.
  • An electrolytic solution containing a sealant deterioration inhibitor is held between the anode foil and the cathode foil.
  • the electrolytic solution contains, for example, a polyethylene glycol-polypropylene glycol copolymer for dissolving the sealant deterioration inhibitor.
  • the opening of the body case containing the capacitor element is sealed with a rubber sealing member.
  • the sealant deterioration inhibitor penetrates into the sealant, and can suppress deterioration of the sealant in a high-temperature environment such as an engine room. Thereby, evaporation of the electrolytic solution can be suppressed, and the characteristics of the electrolytic capacitor can be stably maintained for a long period of time.
  • the electrolyte containing a polymer compound having a polyoxyethylene group or a polyoxypropylene group has a high viscosity. For this reason, the permeability of the sealant deterioration inhibitor dissolved in the electrolytic solution into the sealant deteriorates. As a result, in a high-temperature environment exceeding 150° C., cracks may occur in the sealant before the sealant deterioration inhibitor has sufficiently permeated, and the electrolytic solution may evaporate, shortening the life of the electrolytic capacitor.
  • the content of the sealant deterioration inhibitor in the electrolytic solution is increased in order to allow the sealant deterioration inhibitor to quickly permeate the sealant, a large amount of the insulating sealant deterioration inhibitor exists inside the capacitor element.
  • the amount of the electrolytic solution inside the capacitor element is reduced by the amount of the sealant deterioration inhibitor added, which makes it difficult to lower the ESR of the electrolytic capacitor.
  • An object of the present invention is to provide an electrolytic capacitor with a long life and low ESR.
  • the present invention provides a capacitor element in which an anode foil and a cathode foil having a dielectric oxide film face each other with a separator interposed therebetween; a body case for housing the capacitor element; an electrolyte and a hydrophilic compound are held between the anode foil and the cathode foil, and a sealing body incompatible with the hydrophilic compound is provided inside the body case. It is characterized by disposing a deterioration inhibitor.
  • the sealant deterioration inhibitor is a terpenoid, an unsaturated fatty acid, a polyglycerol ester containing an unsaturated fatty acid group in the molecule, a saturated fatty acid, or a derivative thereof.
  • the hydrophilic compound forms at least a part of the solvent of the electrolytic solution in which the electrolyte is dissolved, and has a boiling point of 180°C or higher.
  • the present invention also provides an electrolytic capacitor having the above structure, wherein the electrolyte is a solid electrolyte, the capacitor element is impregnated with a predetermined liquid, the hydrophilic compound forms at least a part of the liquid, and the boiling point is 180° C. or higher. It is characterized by having
  • the hydrophilic compound has a boiling point of 205°C or higher.
  • the hydrophilic compound contains sulfolane, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, or derivatives thereof.
  • the hydrophilic compound contains polyethylene glycol having a molecular weight of 1000 or more.
  • the electrolyte is a solid electrolyte, and a room-temperature solid substance obtained by melting the electrolyte in a solvent that is solid at room temperature and melts at a temperature higher than room temperature is disposed in the capacitor element. and wherein said hydrophilic compound forms at least part of said solvent.
  • the hydrophilic compound is PEG2000, PEG4000, PEG6000, PEG10000, PEG20000, xylitol or sorbitol.
  • an electrolyte and a hydrophilic compound are held between the anode foil and the cathode foil, and a sealing member deterioration inhibitor that is incompatible with the hydrophilic compound is arranged inside the main body case.
  • FIG. 1 is a perspective view of an electrolytic capacitor according to a first embodiment of the present invention, viewed from above;
  • FIG. 1 is a bottom perspective view of an electrolytic capacitor according to a first embodiment of the present invention;
  • FIG. 1 is a front cross-sectional view showing an electrolytic capacitor according to a first embodiment of the present invention;
  • 1 is a perspective view showing a capacitor element of an electrolytic capacitor according to a first embodiment of the present invention;
  • FIG. 10 is a diagram showing the state of the sealing member after the evaluation test of the electrolytic capacitor according to Example 3 of the present invention;
  • FIG. 10 is a diagram showing the state of the sealing member after the evaluation test of the electrolytic capacitor according to Comparative Example 5 of the present invention;
  • FIG. 1 and 2 show a perspective view of the electrolytic capacitor 1 of the first embodiment as seen from above and a perspective view as seen from below.
  • the electrolytic capacitor 1 is mounted on a seat plate 15 made of synthetic resin.
  • the seat plate 15 is provided with a pair of through holes 15a and 15b.
  • the electrolytic capacitor 1 has lead terminals 8 and 9, and the lead terminals 8 and 9 inserted through the through holes 15a and 15b of the seat plate 15 are bent outward. As a result, the electrolytic capacitor 1 is placed on the circuit board while holding the upper surface of the body case 2 by an automatic machine, and is mounted by soldering the lead terminals 8 and 9 to the lands of the circuit board.
  • FIG. 3 shows a front sectional view of the electrolytic capacitor 1.
  • An electrolytic capacitor 1 includes a body case 2 , a capacitor element 3 and a sealing body 4 .
  • the main body case 2 is made of metal such as aluminum and is formed into a cylindrical shape with a circular cross section and a bottom.
  • Capacitor element 3 is housed in body case 2 , and opening 2 b is sealed with sealing member 4 .
  • the sealing member 4 is formed in a disk shape by molding an insulating elastic material, and has a pair of through holes 4a and 4b.
  • the lead terminals 8 and 9 of the capacitor element 3 are inserted through the through holes 4a and 4b by press fitting.
  • Rubber such as butyl rubber, isoprene rubber, silicone rubber, fluororubber, ethylene propylene rubber, ethylene propylene diene rubber can be used as the sealing member 4 .
  • a rubber made of a composite material containing any of these may be used.
  • Butyl rubber is more preferable because it has high environmental resistance such as heat aging resistance, chemical resistance and weather resistance, high electrical insulation properties, and low gas permeability.
  • the main body case 2 With the sealing member 4 arranged in the opening 2b of the main body case 2, the main body case 2 is subjected to a drawing process that presses the outer peripheral surface. As a result, the main body case 2 is formed with a protruding portion 13 that protrudes toward the inner surface. The outer peripheral surface of the sealing member 4 is compressed in the inner peripheral direction by the protruding portion 13 , and is brought into close contact with the inner peripheral surface of the main body case 2 . In addition, the inner surfaces of the through holes 4a and 4b are brought into close contact with the lead terminals 8 and 9 due to the compression of the sealing member 4. As shown in FIG. As a result, the opening 2 b of the main body case 2 is sealed by the sealing member 4 so that the electrolytic solution held in the capacitor element 3 does not leak out of the main body case 2 .
  • the open end of the main body case 2 forms a folded portion 14 folded back toward the outer surface of the sealing member 4 (the surface opposite to the capacitor element 3).
  • the folded portion 14 and the projecting portion 13 prevent the sealing member 4 from slipping out of the main body case 2 .
  • FIG. 4 shows a perspective view of the capacitor element 3.
  • the capacitor element 3 has an anode foil 5, a cathode foil 7, and a separator 6 which are formed in a long belt shape.
  • Capacitor element 3 is formed by cylindrically winding anode foil 5 and cathode foil 7 with separator 6 interposed therebetween. Thereby, the anode foil 5 and the cathode foil 7 form a pair of electrodes facing each other with the separator 6 interposed therebetween.
  • the belt-shaped anode foil 5, cathode foil 7, and separator 6 are elongated in the winding direction (longitudinal direction), and the width in the direction perpendicular to the winding direction (lateral direction) is shorter than the length in the winding direction.
  • the ends of anode foil 5 or cathode foil 7 are fixed by tape 12 .
  • a lead terminal 8 is connected to the anode foil 5 and a lead terminal 9 is connected to the cathode foil 7 .
  • the width of the separator 6 in the transverse direction is formed larger than the width of the anode foil 5 and the cathode foil 7 in the transverse direction.
  • the separator 6 protrudes upward (toward the end wall 2a) and downward (toward the opening 2b) with respect to the anode foil 5 and the cathode foil 7, thereby preventing the anode foil 5 and the cathode foil 7 from being short-circuited.
  • the anode foil 5 and the cathode foil 7 are mainly made of aluminum and are enlarged by etching.
  • Anode foil 5 may be made of a valve action metal such as tantalum, niobium, or titanium.
  • Anode foil 5 has a dielectric oxide film formed on its surface by chemical conversion.
  • the surface of the cathode foil 7 may be formed with a natural oxide film, or may be formed with a dielectric oxide film by chemical conversion.
  • the separator 6 is made of fibers such as cellulose, polyethylene terephthalate, and aramid. In order to maintain stability at high temperatures (eg, 150° C.), the separator 6 preferably contains synthetic fibers.
  • an electrolytic solution in which an electrolyte is dissolved in a solvent is held.
  • the electrolytic solution permeates the separator 6 and is held between the anode foil 5 and the cathode foil 7 .
  • the electrolyte effectively functions as a cathode.
  • defects in the oxide films of the anode foil 5 and the cathode foil 7 can be repaired by the electrolytic solution.
  • At least one of the solvent of the electrolytic solution and the additive is made of a hydrophilic compound, and the sealant deterioration inhibitor, which will be described later, is incompatible with this hydrophilic compound.
  • the electrolyte When the electrolyte is dissolved in a solvent, it dissociates into ions and exhibits electrical conductivity. Salts containing anions, salts containing anions and cations, etc. are used.
  • a boric acid compound, an organic amine salt of a carboxylic acid compound, or the like is used as the electrolyte.
  • the boric acid compound boric acid, borodisoxalic acid, borodiglycolic acid, borodisalicylic acid, and the like can be used.
  • carboxylic acid phthalic acid, fumaric acid, adipic acid, maleic acid, hydroxynitrobenzoic acid and the like can be used.
  • organic amines secondary organic amines, tertiary organic amines, quaternary organic amines, imidazole compounds, and the like can be used.
  • a high boiling point solvent with a boiling point of 150°C or higher is used as the solvent for the electrolyte.
  • a solvent ⁇ -butyrolactone, sulfolane, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin or derivatives thereof can be used.
  • hydrophilic compound it is more preferable to use a hydrophilic compound as at least part of the solvent.
  • solvents that are hydrophilic compounds include sulfolane, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, and derivatives thereof.
  • the solvent for these hydrophilic compounds lowers the solubility of the later-described sealant deterioration inhibitor in the electrolytic solution. Therefore, for example, even if a hydrophilic compound solvent is used in an amount 10 times that of the sealant deterioration inhibitor, part of the sealant deterioration inhibitor remains undissolved. That is, the sealant deterioration inhibitor is not soluble in the solvent for the hydrophilic compound and is incompatible with the solvent for the hydrophilic compound.
  • the hydrophilic compound accounts for 50% by weight or more of the solvent, more preferably 80% by weight or more, and even more preferably 90% by weight or more.
  • the sealant deterioration inhibitor becomes incompatible with the electrolytic solution containing the hydrophilic compound, and the electrolyte does not dissolve the sealant deterioration inhibitor or the sealant deterioration inhibitor has low solubility.
  • the electrical conductivity of the electrolytic solution can be maintained at a high level, and the sealant deterioration inhibitor can easily permeate the sealant 4 .
  • the electrolytic capacitor 1 In order to use the electrolytic capacitor 1 in a high-temperature environment of 150°C or higher, it is more preferable that 95% or more of the solvents in the electrolytic solution contain a solvent having a boiling point of 180°C or higher. Further, assuming that the electrolytic capacitor 1 is temporarily used in a high temperature environment up to about 175° C., it is more preferable to include 95% or more of the solvent of the electrolytic solution with a boiling point of 205° C. or higher. By doing so, the electrolytic capacitor 1 can have a long life even in a high temperature environment exceeding 150° C. when used together with the sealing member deterioration inhibitor.
  • solvents having a boiling point of 205°C or higher include sulfolane, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, or derivatives thereof. Among them, by using diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, or derivatives thereof, the repairability and withstand voltage of the dielectric oxide film can be improved.
  • Additives may also be added to the electrolytic solution. Additives include nitro compounds, solid hydrophilic compounds, hydrophilic antioxidants, withstand voltage improvers (polyalkylene glycol, etc.), sugars, glycerin, polyglycerin, their derivatives, phosphate esters, gas absorbents, etc. is mentioned.
  • a nitro compound is a compound containing a nitro group, and dinitrobenzene, p-nitrophenol, m-nitroacetophenone, hydroxynitrobenzoic acid, etc. can be used.
  • the nitro compound can absorb the gas emitted from the cathode foil.
  • the additive consisting of a solid hydrophilic compound may be added to the solvent for the hydrophilic compound described above, or may be added to a lipophilic solvent such as ⁇ -butyrolactone.
  • the additive comprising a solid hydrophilic compound makes the sealant deterioration inhibitor immiscible with the electrolytic solution containing the hydrophilic compound, and the electrolyte does not dissolve the sealant deterioration inhibitor or the solubility of the sealant deterioration inhibitor is reduced. become low. Therefore, part of the sealant deterioration inhibitor remains without dissolving in the electrolytic solution containing the hydrophilic compound.
  • Hydrophilic compounds used as additives include polyethylene glycol having a molecular weight of 1000 or more.
  • the hydrophilic antioxidant does not easily permeate the sealing member 4, it can be retained in the capacitor element 3 for a long period of time to suppress oxidation of the electrolytic solution and the separator 6.
  • the electrolyte preferably contains 80% by volume or more of the voids in the capacitor element 3 . By doing so, the electrolytic capacitor 1 can have a longer life.
  • a sealant deterioration suppressing agent is arranged inside the body case 2 of the electrolytic capacitor 1.
  • a compound that is soluble in a lipophilic solvent and incompatible with a hydrophilic compound contained in the electrolytic solution is used as the sealant deterioration inhibitor.
  • the sealant deterioration inhibitor in the main body case 2 permeates into the sealant 4 through the gaps between the molecules of the sealant 4 .
  • the sealant deterioration inhibitor is a compound that remains partially undissolved in, for example, a 10-fold amount of a hydrophilic solvent, and a compound that is soluble in a lipophilic solvent can be selected.
  • a lipophilic solvent include ⁇ -butyrolactone, diethylene glycol monobutyl ether acetate, n-hexane and the like.
  • a compound soluble in a lipophilic solvent is close to the solubility parameter (SP value) of the rubber sealant 4 , so it can be used as a sealant deterioration suppressing agent that quickly permeates the sealant 4 .
  • the sealant deterioration inhibitor may be used by dissolving it in a hydrophobic solvent.
  • a solvent that is not soluble in a hydrophilic solvent can be used as the hydrophobic solvent.
  • the permeability to the sealant 4 can be improved by dissolving it in a hydrophobic solvent.
  • terpenoids such as fat-soluble vitamins having an isoprene skeleton in the molecule (including cases where the main chain of the isoprene skeleton is a single bond or a double bond and cases where it has a cyclic structure), unsaturated fatty acids, molecules Polyglycerol esters containing unsaturated fatty acid groups therein, saturated fatty acids, or derivatives thereof can be used. Further, 2,2'methylenebis(4-ethyl-6-tert-butylphenol) can be used as a sealant deterioration inhibitor which is solid at room temperature.
  • fat-soluble vitamins examples include vitamin A, vitamin D, vitamin E, and vitamin K.
  • Vitamin A is a compound having a carotenoid skeleton, and includes retinol, ⁇ -carotene, ⁇ -carotene, ⁇ -cryptoxanthin, astaxanthin and the like.
  • Vitamin D includes vitamin D2, vitamin D3 and the like.
  • Vitamin E includes tocopherols ( ⁇ -tocopherol, ⁇ -tocopherol, ⁇ -tocopherol, ⁇ -tocopherol) and tocotrienols ( ⁇ -tocotrienol, ⁇ -tocotrienol, ⁇ -tocotrienol, ⁇ -tocotrienol).
  • Vitamin K includes vitamin K1, vitamin K2, menaquinone 7, and the like.
  • fat-soluble vitamins are terpenoids having an isoprene skeleton in their molecules, and have a strong affinity with the rubber sealant 4. For this reason, it is preferable to use a fat-soluble vitamin as an agent for suppressing deterioration of the sealant, since the permeability and retention of the sealant 4 are improved.
  • the number of isoprene units in fat-soluble vitamins is preferably 2 or more, more preferably 3 or more. Vitamin A and vitamin E are more preferable because they have a strong antioxidant effect.
  • the rubber forming the sealing member 4 When the rubber forming the sealing member 4 is heated to a high temperature (for example, 150°C) in the presence of moisture and oxygen, some of the components are oxidized or thermally decomposed, which causes shrinkage and cracks. When cracks occur in the sealing member 4, the effective thickness of the rubber is reduced and the sealing performance is deteriorated.
  • the sealant deterioration inhibitor placed inside the main body case 2 is supplied to the sealant 4 and penetrates into the sealant 4 through the gaps between the molecules of the sealant 4 . Therefore, it is possible to suppress deterioration of the sealing member 4 by reducing permeation of oxygen and moisture.
  • the hydrophilic compound contained in the electrolytic solution can reduce the amount of the sealing member deterioration inhibitor, which is incompatible with the hydrophilic compound, entering the inside of the capacitor element 3 .
  • the sealant deterioration inhibitor easily permeates the sealant 4, and even when the electrolytic capacitor 1 is used in a high-temperature environment, the sealant deterioration inhibitor quickly permeates the sealant 4 and the sealant 4 is removed. Deterioration can be reliably suppressed. As a result, the life of the electrolytic capacitor 1 can be extended.
  • a part of the sealant deterioration inhibitor may be dissolved in the electrolytic solution so that the sealant deterioration inhibitor gradually permeates the sealant 4 through the separator 6 .
  • the amount of the sealant deterioration inhibitor that enters the inside of the capacitor element 3 can be reduced, the amount of electrolytic solution that impregnates the capacitor element 3 can be increased. Therefore, the ESR of the electrolytic capacitor 1 can be lowered.
  • the molecular weight of the sealant deterioration inhibitor is preferably 3,000 or less because of good permeability, and is more preferably 2,000 or less.
  • the molecular weight of the sealing member deterioration inhibitor is preferably 200 or more, because the sealing member 4 can be easily retained, more preferably 250 or more, and even more preferably 300 or more.
  • the sealing body deterioration inhibitor in the electrolytic solution is retained in the capacitor element 3 for a long period of time in a state of less deterioration such as oxidation. Therefore, deterioration of the sealing member 4 can be suppressed over a long period of time.
  • the sealant deterioration inhibitor has the effect of suppressing deterioration of the sealant 4 even if it does not reach the outer surface of the sealant 4 , it is more preferable that it reaches the outer surface of the sealant 4 . As a result, deterioration of the sealing member 4 can be suppressed even on the outer surface of the sealing member 4 where cracks are likely to occur, and intrusion of oxygen and moisture can be further suppressed.
  • the sealant deterioration inhibitor may form an oil film on the outer surface of the sealant 4, or may form a solidified coating portion due to an oxidation reaction caused by contact with oxygen in the air. Permeation of oxygen and moisture can be further suppressed by the coating portion.
  • silicone rubber and fluororubber have lower airtightness than butyl rubber, the airtightness can be improved by providing a covering portion.
  • the weight ratio of the sealing member deterioration inhibitor in the sealing member 4 to the sealing member 4 is preferably 0.1% by weight to 25% by weight. If the weight ratio of the sealant deterioration inhibitor in the sealant 4 to the sealant 4 is lower than 0.1% by weight, the gaps between the molecules of the sealant 4 cannot be sufficiently filled, and moisture permeation is suppressed. effect is not obtained.
  • the sealant 4 may soften or change shape. As a result, the sealing performance of the sealing body 4 is deteriorated, and the permeation of moisture cannot be suppressed. It is more preferable that the hardness (durometer hardness) of the sealing body 4 after permeation of the sealing body deterioration inhibitor is 70 or more on any surface of the sealing body 4, because high sealing performance can be maintained.
  • the thickness of the sealing body 4 is related to the transpiration speed of the electrolytic solution, the permeation amount of moisture, and the permeability of the sealing body deterioration inhibitor.
  • the thickness of the sealing member 4 is preferably 1.4 mm or more in order to keep the evaporation of the electrolytic solution and the permeation of moisture low.
  • the thickness of the sealing body 4 is preferably 7 mm or less in order to allow the sealing body deterioration inhibitor to permeate the entire sealing body 4 and suppress the occurrence of cracks.
  • the sealant deterioration inhibitor that has permeated substantially the entire surface of the sealant 4 on the capacitor element 3 side can be confirmed by the following method.
  • the sealing member 4 from which the electrolytic solution on the surface has been wiped off is cut into pieces having a thickness of, for example, 1 mm and a width of 1 mm in the radial direction from the outer periphery, and pulverized.
  • a solution obtained by extracting the pulverized sample with an organic solvent is analyzed using liquid chromatography-mass spectrometry (LC-MS), gas chromatography-mass spectrometry (GC-MS), or the like. Thereby, the sealant deterioration inhibitor can be detected.
  • LC-MS liquid chromatography-mass spectrometry
  • GC-MS gas chromatography-mass spectrometry
  • the electrolytic capacitor 1 is manufactured by sequentially performing an element formation process, an element housing process, a sealing body mounting process, a molding process, and a repair process.
  • the element forming process further includes an anodizing process, a terminal forming process, a winding process, and an electrolytic solution impregnation process, in this order.
  • the surface of the anode foil 5 is roughened by etching.
  • the etched anode foil 5 is anodized in a chemical solution to form a dielectric oxide film on the surface.
  • lead terminals 8 and 9 are joined to one ends of the anode foil 5 and the cathode foil 7 by caulking.
  • the winding process the anode foil 5 and the cathode foil 7 are wound with the separator 6 interposed therebetween, and the ends are fixed with the tape 12 .
  • the capacitor element 3 is immersed in the electrolytic solution for a predetermined time. Thereby, the capacitor element 3 impregnated with the electrolytic solution is formed.
  • the immersion time of the capacitor element 3 varies depending on the size, but can be, for example, 1 second to several hours, preferably 1 second to 5 minutes.
  • the immersion temperature of the capacitor element 3 is not particularly limited, it can be, for example, 0°C to 80°C, preferably 10°C to 40°C.
  • the capacitor element 3 is inserted into the main body case 2 through the opening 2b and housed. At this time, the interior of the main body case 2 is filled with a sealing member deterioration inhibitor, and the sealing member deterioration inhibitor is arranged between the capacitor element 3 and the main body case 2 .
  • the capacitor element 3 may be immersed in an emulsion in which the sealant deterioration inhibitor is dispersed in the electrolytic solution, and the filling of the sealant deterioration inhibitor in the element housing process may be omitted.
  • the amount of the sealant deterioration inhibitor that enters the inside of the capacitor element 3 increases, but the sealant deterioration inhibitor runs along the separator 6 and is distributed between the capacitor element 3 and the sealant 4 .
  • the sealing body 4 is inserted into the body case 2 housing the capacitor element 3 from the opening 2b side and mounted.
  • the lead terminals 8 and 9 of the capacitor element 3 are inserted through the through holes 4a and 4b of the sealing member 4 by press fitting.
  • the sealant deterioration suppressing agent filled inside the main body case 2 is arranged between the capacitor element 3 and the sealant 4 .
  • the sealant deterioration inhibitor can be applied to the capacitor element 3 and the sealant 4 by arranging the electrolytic capacitor 1 with the end walls 2a facing upward. placed in between.
  • a protruding portion 13 protruding toward the inner surface of the main body case 2 is formed by drawing, and a folded portion 14 is formed by curling the open end.
  • the dielectric oxide film formed on the anode foil 5 and the cathode foil 7 is repaired.
  • the repair work is performed by applying the rated voltage of the capacitor between the lead terminals 8 and 9 for 30 minutes in a high temperature environment of 125° C., for example.
  • the sealing body deterioration inhibitor can be permeated into the sealing body 4 .
  • the high temperature environment at this time promotes the permeation of the sealant deterioration inhibitor into the sealant 4 .
  • an electrolytic solution containing an electrolyte and a hydrophilic compound is held between the anode foil 5 and the cathode foil 7, and a sealant deterioration suppressing agent incompatible with the hydrophilic compound is provided inside the main body case 2. is distributed.
  • the sealant deterioration inhibitor quickly permeates into the sealant 4, deterioration of the sealant 4 can be suppressed even in a high-temperature environment, and an electrolytic capacitor 1 having a long life and a low ESR can be obtained.
  • the sealant deterioration inhibitor is a terpenoid, an unsaturated fatty acid, a polyglycerin ester containing an unsaturated fatty acid group in the molecule, a saturated fatty acid, or a derivative thereof. This makes it possible to easily realize a sealing member deterioration inhibitor that is incompatible with a hydrophilic compound.
  • the hydrophilic compound forms at least part of the solvent of the electrolytic solution in which the electrolyte is dissolved, and has a boiling point of 180°C or higher. This makes it possible to easily realize a long-life electrolytic capacitor 1 even in a high-temperature environment exceeding 150°C.
  • the hydrophilic compound forming the solvent of the electrolytic solution has a boiling point of 205°C or higher, it is possible to easily realize a long-life electrolytic capacitor 1 even in a higher temperature environment.
  • the hydrophilic compound forming the solvent of the electrolytic solution includes sulfolane, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, or derivatives thereof. This makes it possible to easily realize a hydrophilic compound solvent incompatible with the sealant deterioration inhibitor.
  • the hydrophilic compound contained in the electrolytic solution contains polyethylene glycol having a molecular weight of 1000 or more, the addition of the hydrophilic compound makes it possible to easily realize an electrolytic solution in which the sealant deterioration inhibitor is incompatible.
  • the electrolytic capacitor 1 of 2nd Embodiment is formed as a hybrid type in which a capacitor element 3 holds a solid electrolyte and the same electrolytic solution as in the first embodiment between an anode foil 5 and a cathode foil 7 .
  • Other parts are the same as in the first embodiment.
  • the solid electrolyte is made of a conductive polymer, and is provided as a solid electrolyte layer on at least part of the surfaces of the anode foil 5, the cathode foil 7, and the separator 6.
  • Conductive polymers are polymers of pyrrole, thiophene, aniline, or derivatives thereof.
  • the conductive polymer is doped with a compound having a sulfonic acid group such as polystyrene sulfonic acid as a dopant.
  • the conductive polymer may be self-doping in the molecule by having a sulfonic acid group as a side chain substituent.
  • a solid electrolyte layer is formed by impregnating the capacitor element 3 with a dispersion of a conductive polymer in water or an aqueous solution of a conductive polymer and drying.
  • the electrolyte held between the anode foil 5 and the cathode foil 7 is formed in the same manner as in the first embodiment. That is, an organic amine salt of a boric acid compound or a carboxylic acid compound or the like is used as the electrolyte. A boric acid compound or an aromatic carboxylic acid is preferable because the hybrid type electrolytic capacitor 1 has a long life.
  • a high boiling point solvent with a boiling point of 150°C or higher is used as the solvent for the electrolyte.
  • a solvent ⁇ -butyrolactone, sulfolane, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin or derivatives thereof can be used.
  • sulfolane ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, polyglycerin, or derivatives thereof as the solvent for the hydrophilic compound.
  • ethylene glycol, diethylene glycol, polyethylene glycol, polyglycerin, or derivatives thereof as a solvent for the hydrophilic compound. Since these contain hydroxyl groups and ether groups, they improve the repairability and withstand voltage of the dielectric oxide film, have a high affinity with conductive polymers, and have a high boiling point. Therefore, the ESR of the electrolytic capacitor 1 can be kept low for a long period of time.
  • the electrolytic solution covers at least part of the solid electrolyte layer, suppresses contact between oxygen and the solid electrolyte, and suppresses oxidative deterioration of the solid electrolyte.
  • the electrolytic solution substantially entirely covers the solid electrolyte in the capacitor element 3, even if the solvent of the electrolytic solution evaporates, the additive of the electrolytic solution remains, thereby suppressing the oxidative deterioration of the solid electrolyte. can.
  • Additives similar to those in the first embodiment can be added to the electrolytic solution.
  • Polyethylene glycol having a molecular weight of 1000 or more can be added as an additive for the hydrophilic compound.
  • an antioxidant or the like that is soluble in the solvent of the hydrophilic compound may be contained. As a result, at least a portion of the solid electrolyte layer is covered with the electrolytic solution, so that oxidative deterioration of the solid electrolyte layer can be suppressed.
  • the antioxidant that is soluble in the solvent of the hydrophilic compound preferably does not inhibit the restoration of the dielectric oxide film by oxidation. Therefore, the content of the antioxidant in the electrolytic solution is preferably 10% or less, more preferably 3% or less.
  • the manufacturing process of the hybrid electrolytic capacitor 1 of the present embodiment includes an element forming process and a solid electrolyte layer forming process.
  • the element forming process and the solid electrolyte layer forming process are performed between the winding process and the electrolytic solution impregnation process.
  • the capacitor element 3 is immersed in a formation liquid and anodized. As a result, the dielectric oxide film damaged in the winding process or the like is repaired.
  • the capacitor element 3 is immersed in a dispersion liquid in which conductive polymer particles and aggregates thereof are dispersed in a dispersion medium to impregnate the capacitor element 3 with the dispersion liquid.
  • the capacitor element 3 is dried at a high temperature to remove the dispersion medium and form a solid electrolyte layer.
  • the dispersion medium does not dissolve the conductive polymer, and it is more desirable to use water in consideration of handling and dispersibility.
  • the capacitor element 3 can be immersed in a dispersion of polyethylenedioxythiophene particles in water under reduced pressure to impregnate the capacitor element 3 with the dispersion.
  • the dispersion medium may contain a dopant agent.
  • the dispersion medium can be removed by drying the capacitor element 3 at 100° C. to 200° C., for example.
  • the solid electrolyte layer may be formed by oxidatively polymerizing the polymerizable monomer in the solid electrolyte layer forming step. That is, the capacitor element 3 is impregnated with a polymerizable monomer (for example, an ethylenedioxythiophene monomer). Next, the capacitor element 3 is immersed in an oxidizing agent (for example, an ethanol solution of iron p-toluenesulfonate) to perform oxidative polymerization. Thereby, a solid electrolyte layer made of a conductive polymer (eg, polyethylenedioxythiophene) is formed.
  • a polymerizable monomer for example, an ethylenedioxythiophene monomer
  • an oxidizing agent for example, an ethanol solution of iron p-toluenesulfonate
  • a solid electrolyte and a liquid containing a hydrophilic compound are held between the anode foil 5 and the cathode foil 7, and the inside of the main body case 2
  • a sealant deterioration inhibitor that is incompatible with the hydrophilic compound is added.
  • the hydrophilic compound forms at least part of the solvent of the electrolytic solution and has a boiling point of 180°C or higher, it is possible to obtain an electrolytic capacitor 1 with a long life even in a high temperature environment exceeding 150°C.
  • the capacitor element 3 holds a solid electrolyte and a predetermined functional liquid. Other parts are the same as in the second embodiment.
  • the solid electrolyte is composed of a conductive polymer similar to that of the second embodiment.
  • the conductive polymer can reduce the ESR of the electrolytic capacitor 1 .
  • the same liquid as the solvent for the electrolytic solution in the second embodiment can be used as the functional liquid held in the capacitor element. That is, sulfolane, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, polyglycerin, or derivatives thereof can be used as the functional liquid of the hydrophilic compound.
  • the withstand voltage of the electrolytic capacitor 1 can be improved.
  • a compound containing a hydroxyl group such as sugar or glycerin is used as the functional liquid, the conductivity of the solid electrolyte layer can be improved.
  • a hydrophilic compound such as polyethylene glycol having a molecular weight of 1000 or more can be added to a lipophilic liquid such as ⁇ -butyrolactone.
  • a solid electrolyte and a liquid containing a hydrophilic compound are held between the anode foil 5 and the cathode foil 7, and the main body case In the inside of 2, a sealing member deterioration inhibitor which is incompatible with a hydrophilic compound is arranged.
  • a sealing member deterioration inhibitor which is incompatible with a hydrophilic compound is arranged.
  • the capacitor element 3 holds a solid electrolyte and a predetermined room-temperature solid substance. Other parts are the same as in the second embodiment.
  • the solid electrolyte is composed of a conductive polymer similar to that of the second embodiment.
  • the conductive polymer can reduce the ESR of the electrolytic capacitor 1 .
  • the room-temperature solid substance is solid at room temperature (eg, 30°C), and the electrolyte is melted in a solvent that melts at a temperature higher than room temperature (eg, 50°C or higher) when the electrolytic capacitor 1 is used.
  • a temperature higher than room temperature eg, 50°C or higher
  • the room-temperature solid substance is solid at room temperature or below, and becomes a liquid electrolytic solution at a temperature higher than room temperature.
  • the solvent contained in the room temperature solid substance is composed of hydrophilic compounds.
  • Polyethylene glycol, saccharides, and the like are used as a solvent for the hydrophilic compound. These are solid at room temperature and have a melting point of 50° C. or higher.
  • polyethylene glycol for example, PEG2000 (melting point 51°C), PEG4000 (melting point 56°C), PEG6000 (melting point 58°C), PEG10000 (melting point 62°C), and PEG20000 (melting point 63°C) can be used.
  • PEG2000 indicates polyethylene glycol having an average molecular weight of 2,000. The same applies to PEG4000, PEG6000, PEG10000 and PEG20000.
  • xylitol melting point 92°C
  • sorbitol melting point 95°C
  • An acid or a base can be mentioned as an electrolyte contained in a normal temperature solid substance.
  • Acids that are electrolytes contained in room temperature solid substances include malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, decanedicarboxylic acid, tartronic acid, fumaric acid, maleic acid, citraconic acid, malic acid, tartaric acid, and phthalic acid.
  • nitrophthalic acid, citric acid, tricarbanilic acid, pyromellitic acid, boric acid, phosphoric acid, borodisalicylic acid, borodisalicylic acid, trinitrophenol, hydroxynitrophenol, and sulfosalicylic acid can be used.
  • Ammonia monoethylamine, diethylamine, triethylamine, monoethanolamine, diethanolamine, triethanolamine, benzylamine, naphthylamine, morpholine, aniline, acetanilide, phenanthroline, caffeine, and imidazole are used as electrolyte bases contained in room-temperature solid substances. be able to.
  • the electrolytic capacitor 1 configured as described above When the electrolytic capacitor 1 configured as described above is placed in a high-temperature environment during use, the room-temperature solid substance is liquefied, so a solvent of a hydrophilic compound is placed in the capacitor element 3 . Therefore, the amount of the sealant deterioration inhibitor that enters the inside of the capacitor element 3 can be reduced, and the sealant deterioration inhibitor easily permeates the sealant 4 . In addition, since the amount of the sealant deterioration inhibitor is small inside the capacitor element 3, the impregnation amount of the room-temperature solid substance can be increased. As a result, the ESR of the electrolytic capacitor 1 can be lowered, and the life of the electrolytic capacitor 1 can be extended.
  • a room temperature solid substance is manufactured through a melting process, a solidification process, and a pulverization process.
  • a solvent is put in a container and heated to a temperature higher than the melting point of the solvent.
  • the melting point varies depending on the solvent as described above.
  • an electrolyte is added to the liquefied solvent to prepare a solution in which the electrolyte is uniformly dissolved in the solvent.
  • a heater may be used for heating in the melting step, or a high-frequency heating device may be used.
  • the above container is cooled to room temperature to solidify the room temperature solid substance.
  • the room-temperature solid material is arranged such that the electrolyte is dispersed in the solidified solvent.
  • the normal-temperature solid material solidified in the solidification step is pulverized. This forms a powdery room temperature solid material.
  • the electrolytic capacitor 1 of the present embodiment is manufactured in the same manner as in the second embodiment, and in the element housing step, the main body case 2 contains the powder of the room temperature solid substance, and is heated to the melting point of the solvent of the room temperature solid substance or higher. As a result, the room-temperature solid substance is melted within the main body case 2 . After that, the capacitor element 3 is housed in the body case 2 .
  • the liquid room-temperature solid substance penetrates into the capacitor element 3 by capillary action.
  • a room temperature solid material is arranged between the anode foil 5 and the cathode foil 7 and between the capacitor element 3 and the body case 2 .
  • the body case 2 is filled with a sealant deterioration suppressing agent, and the next process of attaching the sealant is performed.
  • a room-temperature solid substance containing a solid electrolyte and a hydrophilic compound is held between the anode foil 5 and the cathode foil 7, and a hydrophilic compound is contained inside the main body case 2.
  • a sealant deterioration inhibitor that is incompatible with the chemical compound is disposed.
  • the hydrophilic compound forms at least part of the solvent of the room temperature solid substance, the hydrophilic compound that is liquid at a temperature higher than room temperature suppresses the permeation of the sealant deterioration inhibitor into the capacitor element 3 . This allows the sealant deterioration inhibitor to quickly permeate the sealant 4 in a high-temperature environment.
  • hydrophilic compound is PEG2000, PEG4000, PEG6000, PEG10000, PEG20000, xylitol, or sorbitol, it is possible to easily realize a hydrophilic compound incompatible with the sealant deterioration inhibitor.
  • the electrodes (the anode foil 5 and the cathode foil 7) of the capacitor element 3 are wound facing each other with the separator 6 interposed therebetween. good.
  • Example 1 is formed by the electrolytic capacitor 1 of the first embodiment.
  • the solvent of the electrolytic solution of Example 1 is ethylene glycol
  • the sealant deterioration inhibitor is ⁇ -tocopherol, which is incompatible with ethylene glycol.
  • the weight ratio of the electrolytic solution and the sealant deterioration inhibitor was 75:25.
  • the weight ratio of solvent to solute in the electrolyte is 85:15.
  • the sealing member 4 is made of butyl rubber.
  • Example 2 is formed by the electrolytic capacitor 1 of the second embodiment.
  • the solvent of the electrolytic solution in Example 2 was sulfolane, and the sealant deterioration inhibitor was ⁇ -tocopherol, which is incompatible with sulfolane.
  • the weight ratio of the electrolytic solution and the sealant deterioration inhibitor was 75:25.
  • the weight ratio of solvent to solute in the electrolyte is 85:15.
  • the sealing member 4 is made of butyl rubber.
  • Example 3 is formed by the electrolytic capacitor 1 of the third embodiment.
  • the functional liquid of Example 3 is triethylene glycol, and the sealant deterioration inhibitor is ⁇ -tocopherol, which is incompatible with triethylene glycol.
  • the weight ratio of the functional liquid to the sealant deterioration inhibitor was 75:25.
  • the sealing member 4 is made of butyl rubber.
  • Comparative Example 1 Also, a comparative example was created for comparison. Comparative Example 1 used ⁇ -butyrolactone instead of the electrolytic solution of Example 1. ⁇ -Tocopherol, which is a sealant deterioration inhibitor, is compatible with ⁇ -butyrolactone.
  • Comparative Example 2 used ⁇ -butyrolactone instead of the electrolytic solution of Example 2.
  • ⁇ -Tocopherol which is a sealant deterioration inhibitor, is compatible with ⁇ -butyrolactone.
  • Comparative Example 3 In Comparative Example 3, a polyethylene glycol-polypropylene glycol copolymer was used in place of the electrolytic solution of Example 2. ⁇ -Tocopherol, which is a sealant deterioration inhibitor, is compatible with polyethylene glycol-polypropylene glycol copolymer.
  • Comparative Example 4 has a configuration in which the sealing member deterioration inhibitor is omitted from the electrolytic capacitor 1 of Example 2.
  • Comparative Example 5 has a configuration in which the sealing member deterioration inhibitor is omitted from the electrolytic capacitor 1 of Example 3.
  • Comparative Example 6 has a configuration in which the sealing member deterioration inhibitor is omitted from the electrolytic capacitor 1 of Comparative Example 2.
  • Comparative Example 7 has a configuration in which the sealing member deterioration inhibitor is omitted from the electrolytic capacitor 1 of Comparative Example 3.
  • Example 1 a sample was prepared from Example 1 and Comparative Example 1 by omitting the sealant deterioration inhibitor.
  • evaluation tests 1 to 3 were performed on the electrolytic capacitors 1 of the above examples and comparative examples.
  • evaluation test 1 the ratio of the properties of Example 1 and Comparative Example 1 to the properties of the sample without the sealant deterioration inhibitor was measured. Specifically, the characteristics of capacitance, tan ⁇ , and ESR were measured for Example 1, Comparative Example 1, and samples from which the sealant deterioration inhibitor was omitted. Then, each characteristic of Example 1 and Comparative Example 1 was expressed as a ratio, with each characteristic of the sample from which the sealant deterioration inhibitor was omitted being 1.
  • Evaluation Tests 2 and 3 used Examples 2-3 and Comparative Examples 2-7 to investigate the permeability of the sealant deterioration inhibitor into the sealant 4. Specifically, the electrolytic capacitor 1 was placed with the outer surface of the sealing member 4 facing up in an atmosphere of 175° C., and the weight change and step change rate of the sealing member 4 after high temperature storage for 500 hours were measured. Evaluation Tests 2 and 3 are measured simultaneously using the same sample, and the number of samples is 5 for each example and each comparative example.
  • the weight of the sealing body 4 before assembly of the electrolytic capacitor 1 was subtracted from the weight of the sealing body 4 taken out by disassembling the electrolytic capacitor 1 after the test.
  • the step amount for obtaining the step change rate of the sealing member 4 in the evaluation test 3 is the distance in the height direction from the reference surface of the area between the lead terminals 8 and 9 (average value of multiple points).
  • the upper surface of the folded portion 14 of the main body case 2 is used as a reference plane with the outer surface of the sealing member 4 facing upward, and the distance from the reference plane is measured by a three-dimensional measuring machine.
  • a positive value of the step change rate indicates a direction in which the step amount decreases, and a negative value indicates a direction in which the step amount increases.
  • the step change rate is greater than +100%, it indicates that the surface of the sealing body 4 protrudes from the reference surface, and deterioration of the sealing performance appears.
  • Table 1 shows the results of Evaluation Test 1. According to Table 1, in Comparative Example 1 containing the sealing member deterioration inhibitor, the characteristic deterioration is greater than in the case where the sealing member deterioration inhibitor is omitted. On the other hand, in Example 1, even if the sealant deterioration inhibitor is added, the amount of the sealant deterioration inhibitor dissolved in the electrolytic solution is small, so that the influence of the electrolytic solution on the electrical conductivity can be suppressed. As a result, it was confirmed that deterioration of the characteristics of the electrolytic capacitor 1 can be suppressed.
  • Table 2 shows the results of evaluation test 2
  • FIG. 5 shows the results of evaluation test 3.
  • 6 shows the state of the sealant 4 of Example 3 after evaluation tests 2 and 3
  • FIG. 7 shows the state of the sealant 4 of Comparative Example 5 after evaluation tests 2 and 3.
  • the sealing member 4 does not shrink and cracks occur on the outer surface of the sealing member 4. It was visually observed that no Since the sealing body 4 is not shrunk, cracks are less likely to occur in the sealing body 4, and gaps between the sealing body 4 and the lead terminals 8 and 9 and between the sealing body 4 and the main body case 2 are less likely to occur. Sealing performance is maintained.
  • the step change rate was less than 100%, and no deterioration in sealing performance due to permeation of the sealing member deterioration inhibitor was observed.
  • the present invention can be used in automobiles, electronic devices, etc. in which electrolytic capacitors are mounted in circuits.

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  • Engineering & Computer Science (AREA)
  • 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)
PCT/JP2022/031677 2021-08-26 2022-08-23 電解コンデンサ Ceased WO2023027059A1 (ja)

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EP22861347.7A EP4394832A4 (en) 2021-08-26 2022-08-23 ELECTROLYTIC CAPACITOR
US18/683,922 US12573563B2 (en) 2021-08-26 2022-08-23 Electrolytic capacitor with electrolyte and hydrophilic compound containing liquid
CN202280058060.1A CN117882160A (zh) 2021-08-26 2022-08-23 电解电容器
JP2023543924A JP7761287B2 (ja) 2021-08-26 2022-08-23 電解コンデンサ
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WO2021149739A1 (ja) * 2020-01-22 2021-07-29 日本ケミコン株式会社 固体電解コンデンサ

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JP2006253458A (ja) * 2005-03-11 2006-09-21 Matsushita Electric Ind Co Ltd チップ型アルミ電解コンデンサ
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JP6740579B2 (ja) 2015-08-12 2020-08-19 日本ケミコン株式会社 固体電解コンデンサおよび固体電解コンデンサの製造方法
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WO2021049015A1 (ja) * 2019-09-13 2021-03-18 サン電子工業株式会社 コンデンサ
WO2021049190A1 (ja) * 2019-09-13 2021-03-18 サン電子工業株式会社 コンデンサ
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