WO2020021679A1 - 電解コンデンサ - Google Patents
電解コンデンサ Download PDFInfo
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- WO2020021679A1 WO2020021679A1 PCT/JP2018/028097 JP2018028097W WO2020021679A1 WO 2020021679 A1 WO2020021679 A1 WO 2020021679A1 JP 2018028097 W JP2018028097 W JP 2018028097W WO 2020021679 A1 WO2020021679 A1 WO 2020021679A1
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- electrode body
- conductive polymer
- separator
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- cellulose derivative
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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
- H01G9/0029—Processes of manufacture
- H01G9/0036—Formation of the solid electrolyte layer
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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
- H01G9/02—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
- H01G9/035—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
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
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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
- H01G9/15—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
- H01G9/15—Solid electrolytic capacitors
Definitions
- the present invention relates to an electrolytic capacitor including a conductive polymer in a capacitor element.
- Patent Document 1 A conventional electrolytic capacitor is disclosed in Patent Document 1.
- a capacitor element is housed in a bottomed cylindrical main body case, and an opening of the main body case is sealed with a sealing body such as rubber.
- the capacitor element is formed by winding an anode foil having a dielectric film formed thereon and an opposite cathode foil via a separator.
- the capacitor element is impregnated with a conductive polymer and an electrolytic solution.
- the capacitor element is immersed in the dispersion of the conductive polymer particles, taken out and dried, so that the capacitor element is impregnated with the conductive polymer. Also, by immersing the capacitor element in the electrolytic solution, the electrolytic solution is impregnated into the capacitor element.
- the electrolytic capacitor having the above configuration since the conductive polymer is disposed between the anode foil and the counter cathode foil, the ESR of the electrolytic capacitor can be reduced. Further, the defect of the dielectric film is repaired by the electrolytic solution, and the withstand voltage of the electrolytic capacitor can be increased.
- JP-A-2008-10657 (pages 4 to 13, FIG. 1)
- the anode foil, the separator, and the counter cathode foil of the capacitor element are in close contact with each other in the radial direction. For this reason, when drying the capacitor element taken out from the dispersion liquid of the conductive polymer particles, the dispersion medium escapes from the axial direction of the capacitor element. At this time, the particles of the conductive polymer move in the axial direction together with the rapidly flowing dispersion medium, and are concentrated at the axial ends. Therefore, there is a large range where the conductive polymer is not disposed between the opposed anode foil and the opposed cathode foil, and there is a problem that the ESR cannot be sufficiently reduced.
- An object of the present invention is to provide an electrolytic capacitor having a low ESR and a method for manufacturing the same.
- the present invention provides an electrolytic capacitor in which a capacitor element that holds an electrolytic solution by winding a first electrode body and a second electrode body via a separator is accommodated in a main body case.
- a conductive polymer particle band disposed between the electrode body and the second electrode body, the conductive polymer particles being disposed in a dense state and extending in the longitudinal direction of the separator;
- the cellulose polymer is included, and the conductive polymer particle band is provided in at least one region with respect to the center line in the transverse direction of the separator, and at least half of the conductive polymer particle band is provided in the transverse direction of the separator.
- the present invention is characterized in that, in the electrolytic capacitor having the above configuration, the cellulose derivative is contained in the electrolytic solution.
- the present invention is also characterized in that, in the electrolytic capacitor having the above-described structure, the cellulose derivative is a gelling agent that gels water by heating at 45 ° C. or more.
- the cellulose derivative is any one of methylcellulose, hydroxyethylmethylcellulose, hydroxyethylethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose.
- the present invention is also characterized in that the conductive polymer particle band is provided between both ends in the short direction of the separator in the electrolytic capacitor having the above configuration.
- the present invention is also characterized in that, in the electrolytic capacitor having the above-described structure, the conductive polymer particle band is provided between one end and the center in the short direction of the separator.
- the present invention also provides a method for manufacturing an electrolytic capacitor in which a capacitor element holding an electrolytic solution is housed in a main body case.
- a first drying step of drying the capacitor element taken out of the aqueous solution A conductive polymer immersion step of immersing the capacitor element in a conductive polymer dispersion after the first drying step;
- a second drying step of drying the capacitor element taken out of the dispersion An electrolyte holding step of holding an electrolyte between the first electrode body and the second electrode body after the second drying step is provided.
- the present invention is characterized in that, in the method for manufacturing an electrolytic capacitor having the above configuration, the capacitor element is dried in an environment of 45 ° C. or more in the second drying step.
- the present invention is characterized in that, in the method for manufacturing an electrolytic capacitor having the above configuration, the cellulose derivative is any one of methylcellulose, hydroxyethylmethylcellulose, hydroxyethylethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose.
- the conductive polymer particle band in which the conductive polymer particles extend in the longitudinal direction of the separator in a dense state is formed in at least one region with respect to the center line in the transverse direction of the separator. More than half in the direction. For this reason, the conductive polymer is disposed in a wide range between the first electrode body and the second electrode body. Therefore, the ESR of the electrolytic capacitor can be reduced.
- the capacitor element having the first electrode body, the separator and the second electrode body wound thereon is immersed in an aqueous solution of a cellulose derivative and dried, and then immersed in a conductive polymer dispersion and dried.
- the viscosity of the dispersion of the conductive polymer increases due to the dissolution of the cellulose derivative held in the capacitor element, and the movement of the dispersion medium in the axial direction during drying becomes slow. Therefore, the movement of the particles of the conductive polymer in the axial direction is suppressed, and the conductive polymer is arranged in a wide range between the first electrode body and the second electrode body. Therefore, the ESR of the electrolytic capacitor can be reduced.
- FIG. 1 is a perspective view showing a capacitor element of an electrolytic capacitor according to an embodiment of the present invention.
- FIG. 4 is a perspective view illustrating a state of the capacitor element of the electrolytic capacitor according to the embodiment of the present invention after the second drying step.
- FIG. 4 is a perspective view illustrating another state of the capacitor element of the electrolytic capacitor according to the embodiment of the present invention after the second drying step.
- 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, an insulating sheet 4, 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 a cylindrical peripheral wall 3b closed at one end by an end wall 3a and has an opening 3c at the other end.
- the capacitor element 10 is housed in the main body case 3, and lead terminals 7 and 8 connected to a first electrode body 11 and a second electrode body 12 (see FIG. 4) to be described later are extended.
- the sealing body 5 is formed in a disk shape by a molded product of an insulating elastic material (rubber or the like), and has a pair of through holes 5a and 5b. With the sealing body 5 arranged in the opening 3c of the main body case 3, drawing is performed on the peripheral surface of the main body case 3 to form a concave portion 3d. Thereby, the sealing body 5 is fixed, and the opening 3 c of the main body case 3 is sealed by the sealing body 5. At this time, the lead terminals 7 and 8 of the capacitor element 10 housed in the main body case 3 are pressed into the through holes 5a and 5b, and the capacitor element 10 is fixed.
- an insulating elastic material rubber or the like
- FIG. 4 is a perspective view of the capacitor element 10.
- the capacitor element 10 has a long first electrode body 11, a second electrode body 12, and a separator 13 extending in the longitudinal direction X.
- the capacitor element 10 is formed in a roll shape by winding the first electrode body 11 and the second electrode body 12 via the insulator separator 13.
- the end of the first electrode body 11 or the second electrode body 12 is fixed by a winding tape 14.
- the width W of the separator 13 in the short direction Y is formed larger than the width of the first electrode body 11 and the second electrode body 12 in the short direction Y for insulation.
- the first electrode body 11 is made of a valve metal such as aluminum, tantalum, niobium, and titanium.
- An oxide dielectric film (not shown) is formed on the surface of the first electrode body 11 by a chemical conversion treatment.
- the second electrode body 12 faces the first electrode body 11 with the separator 13 interposed therebetween, and is made of aluminum or the like.
- the lead terminal 7 is connected to the first electrode body 11 having a dielectric coating, and the lead terminal 8 is connected to the second electrode body 12.
- the first electrode body 11 and the second electrode body 12 may be provided with a dielectric film.
- a conductive polymer is disposed between the first electrode body 11 and the second electrode body 12 of the capacitor element 10. Further, the electrolytic solution is held in the capacitor element 10.
- FIGS. 5 and 6 are perspective views showing a state where the insulating sheet 4 is installed.
- FIG. 5 shows a view of the inside of the main body case 3
- FIG. 6 shows an upper part of the capacitor element 10 omitting the main body case 3.
- the insulating sheet 4 is formed by laminating natural cellulose fibers or synthetic resin fibers, and is disposed between the end wall 3a of the main body case 3 and the capacitor element 10. The insulating sheet 4 prevents a short circuit between the first electrode body 11 and the second electrode body 12 via the main body case 3.
- the insulating sheet 4 is formed in a square shape, and the diagonal line of the insulating sheet 4 is larger than the inner diameter of the main body case 3. For this reason, the insulating sheet 4 has a bottom surface portion 4a disposed on the end wall 3a (see FIG. 3) of the main body case 3, and a side surface portion 4b bent from the bottom surface portion 4a and disposed on the peripheral wall 3b. .
- the insulating sheet 4 may be formed in a rectangular shape, or may be formed in a parallelogram (including a rhombus).
- the insulating sheet 4 may hold an antioxidant such as a vitamin antioxidant (such as vitamin C), an amine antioxidant, a phenol antioxidant, a phosphorus antioxidant, and a sugar antioxidant. .
- an antioxidant such as a vitamin antioxidant (such as vitamin C), an amine antioxidant, a phenol antioxidant, a phosphorus antioxidant, and a sugar antioxidant.
- oxidizing substances such as air trapped at the time of closing the capacitor body 2 and air that enters through the use over time are chemically captured by the oxidation inhibitor or changed into compounds having low oxidizing properties. For this reason, it is possible to suppress the oxidation of the conductive polymer and to suppress an increase in the ESR of the electrolytic capacitor 1 over time.
- FIG. 7 is a process chart showing a manufacturing process of the electrolytic capacitor 1.
- the electrolytic capacitor 1 is formed by sequentially performing an element forming step, an assembling step, a cleaning step, an aging step, and an inspection step.
- the element forming steps for forming the capacitor element 10 include an anodizing step, a terminal forming step, a winding step, an element forming step, a cellulose derivative dipping step, a first drying step, a conductive polymer dipping step, and a second drying step.
- an electrolytic solution holding step are sequentially performed.
- the surface of the first electrode body 11 made of a valve metal is roughened by etching.
- the etched first electrode body 11 is anodized in a chemical conversion solution to form a dielectric film made of an oxide film on the surface.
- lead tabs (not shown) of the lead terminals 7 and 8 are joined to one ends of the first electrode body 11 and the second electrode body 12 by caulking.
- the first electrode body 11 and the second electrode body 12 are wound via the separator 13 to form the capacitor element 10 in a roll shape.
- the end of the capacitor element 10 is fixed by a winding tape 14.
- the capacitor element 10 is immersed in a chemical conversion solution and anodized. Thereby, the dielectric film lost in the winding step or the like is repaired.
- the capacitor element 10 is immersed in an aqueous solution of the cellulose derivative 21 (see FIG. 8).
- the capacitor element 10 extracted from the aqueous solution of the cellulose derivative 21 is dried.
- FIG. 8 is a perspective view illustrating the state of the capacitor element 10 after the first drying step.
- An aqueous solution of the cellulose derivative 21 is held between the first electrode body 11 and the second electrode body 12 by the cellulose derivative immersion step, and water as a solvent is evaporated by the first drying step. Thereby, the cellulose derivative 21 adheres to the surfaces of the first electrode body 11, the second electrode body 12, and the separator 13.
- the surface of the separator 13 of the capacitor element 10 is illustrated, but the surfaces of the first electrode body 11 and the second electrode body 12 are also the same. Further, for convenience of explanation, the cellulose derivative 21 is described in a particle shape, but the cellulose derivative 21 is formed in a film shape.
- methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxypropylethylcellulose, ethylhydroxyethylcellulose, hydroxyethylmethylcellulose, hydroxyethylethylcellulose, carboxymethylcellulose and the like are used.
- the aqueous solution of the cellulose derivative 21 is impregnated into the capacitor element 10 at a concentration of 0.05% or more to form the conductive polymer particle band 23 (see FIG. 9) having a large width in the lateral direction Y as described later. It will be easier. If the aqueous solution of the cellulose derivative 21 has a concentration of 2% or less, it is easy to impregnate the capacitor element 10.
- hydroxyalkylcellulose such as hydroxyethylcellulose, hydroxypropylcellulose and hydroxypropylmethylcellulose may be hydrophobized by substituting a part of hydroxyl groups with fatty acid esters or the like. This makes it possible to adjust the water solubility of the hydroxyalkylcellulose and to suppress the occurrence of mako when dissolved in water.
- the capacitor element 10 is immersed in a dispersion in which particles of the conductive polymer 22 are dispersed in a dispersion medium, and the dispersion is impregnated in the capacitor element 10.
- water is used as a dispersion medium, and the capacitor element 10 is immersed in an aqueous dispersion of the conductive polymer 22 particles.
- the particles of the conductive polymer 22 are dense and uniform between the first electrode body 11, the second electrode body 12, and the separator 13. Distributed to. Further, a part of the cellulose derivative 21 attached to the first electrode body 11, the second electrode body 12, and the separator 13 is dissolved in the dispersion medium. This increases the viscosity of the aqueous dispersion of the conductive polymer 22 near the first electrode body 11, the second electrode body 12, and the separator 13.
- the capacitor element 10 taken out from the aqueous dispersion of the conductive polymer 22 is dried. It is more desirable to dry the capacitor element 10 at a temperature of 45 ° C. or higher (for example, 100 ° C. to 200 ° C.) because it dries quickly.
- FIG. 9 is a perspective view illustrating a state of the capacitor element 10 after the second drying step.
- the first electrode body 11, the second electrode body 12, and the separator 13 are in close contact with each other in the radial direction. Therefore, the dispersion medium of the aqueous dispersion of the conductive polymer 22 impregnated in the capacitor element 10 escapes from the axial direction of the capacitor element 10 during drying. At this time, since the aqueous dispersion of the conductive polymer 22 in which the cellulose derivative 21 is dissolved has a high viscosity even at a high temperature during drying, the movement of water is slow.
- the particles of the conductive polymer 22 on the first electrode body 11, the second electrode body 12, and the separator 13 move little from the position before drying. Therefore, the particles of the conductive polymer 22 adhere to the first electrode body 11, the second electrode body 12, and the separator 13 while maintaining the position before drying. In addition, the cellulose derivative 21 dissolved in the aqueous dispersion adheres again to the first electrode body 11, the second electrode body 12, and the separator 13 by drying.
- the particles of the conductive polymer 22 adhered in the second drying step are substantially uniformly distributed on the first electrode body 11, the second electrode body 12, and the separator 13. That is, between the first electrode body 11 and the second electrode body 12, a belt-like conductive polymer particle band 23 in which the particles of the conductive polymer 22 extend in the longitudinal direction X of the separator 13 in a dense state is formed. Is done.
- the conductive polymer particle zone 23 contains the cellulose derivative 21 confined in the layer of the conductive polymer 22 particles and the cellulose derivative 21 reattached in the second drying step.
- a gelling agent that gels water by heating at 45 ° C. or higher as the cellulose derivative 21.
- the capacitor element 10 is heated and dried in an atmosphere of 45 ° C. or more in the second drying step, the aqueous dispersion in which the cellulose derivative 21 is dissolved changes to a physical gel. Therefore, even at a temperature of about 100 ° C. at which water boils, the movement of water becomes slower, and the movement of the conductive polymer 22 can be further reduced.
- methylcellulose, hydroxyethylmethylcellulose, hydroxyethylethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose can be used.
- the edge in the short direction Y of the conductive polymer particle band 23 and the edge in the short direction Y of the separator 13 are shown separately for easy understanding. Since the aqueous dispersion of the conductive polymer 22 is impregnated into the capacitor element 10 from the edge in the short direction Y, the conductive polymer particle band 23 is usually formed from the edge in the short direction Y of the separator 13. You.
- the conductive polymer particle band 23 is provided across both ends of the separator 13 in the short direction Y. That is, the conductive polymer particle band 23 is divided by the center line C of the separator 13 in the short direction Y. It is formed in the first region 26 and the second region 27.
- the width D of the first and second regions 26 and 27 in the short direction Y is ⁇ of the width W of the separator 13 in the short direction Y.
- the width A1 in the short direction Y of the conductive polymer particle band 23 in the first region 26 is at least half the width D in the short direction Y of the first region 26.
- the width A2 of the conductive polymer particle band 23 in the short direction Y in the second region 27 is equal to or more than half the width D of the second region 27 in the short direction Y.
- the conductive polymer 22 exists in a wide range of the first electrode body 11, the second electrode body 12, and the separator 13 with less bias. Therefore, the ESR of the electrolytic capacitor 1 can be reduced.
- FIG. 10 is a perspective view illustrating a state after the second drying step of the capacitor element 10 in this state. Since the aqueous dispersion impregnated in the capacitor element 10 does not reach the center line C from the edge in the short direction Y, the conductive polymer particle band 23 is formed by being divided in the short direction Y.
- the width A1 of the conductive polymer particle band 23 in the short direction Y in the first region 26 is equal to or more than half the width D of the first region 26 in the short direction Y.
- the width A2 of the conductive polymer particle band 23 in the short direction Y in the second region 27 is equal to or more than half the width D of the second region 27 in the short direction Y. Therefore, the ESR of the electrolytic capacitor 1 can be reduced.
- the conductive polymer immersion step only one end in the axial direction of the capacitor element 10 may be immersed in the electrolytic solution in the aqueous dispersion of the conductive polymer and the other end may be in a non-immersed state in the aqueous dispersion. .
- the conductive polymer particle band 23 is provided between one end of the separator 13 in the lateral direction Y and the center.
- the conductive polymer 22 is spread over a wide range as described above. Be placed.
- the capacitor element 10 is immersed in a non-aqueous electrolytic solution. Thereby, the electrolytic solution is held in the capacitor element 10.
- the cellulose derivative 21 (see FIG. 9) on the first electrode body 11, the second electrode body 12, and the separator 13 is included in the electrolyte solution in a floating state.
- an organic acid or organic acid salt electrolyte is dissolved in a polar solvent such as ⁇ -butyrolactone.
- a solution of borodisalicylic acid in ⁇ -butyrolactone can be used as the electrolytic solution.
- the concentration of the electrolyte in the solvent is not particularly limited, and may be, for example, 5 to 50% by weight.
- the immersion time of the capacitor element 10 varies depending on the size, it can be, for example, 1 second to several hours, preferably 1 second to 5 minutes.
- the immersion temperature of the capacitor element 10 is not particularly limited, but may be, for example, 0 ° C. to 80 ° C., and preferably 10 ° C. to 40 ° C.
- the sealing body 5 is attached to the opening 3c of the main body case 3. Then, drawing is performed on the peripheral surface of the main body case 3 facing the sealing body 5 to form the concave portion 3d, and curling is performed on the peripheral edge of the opening 3c. Thereby, the main body case 3 containing the capacitor element 10 is sealed.
- the cleaning step dirt from the electrolytic solution attached to the outer surface of the main body case 3 is cleaned.
- an aging process is performed at about 125 ° C. for about 1 hour while applying a rated voltage or a voltage higher than the rated voltage between the lead terminals 7 and 8. By the aging process, the defect of the dielectric film generated on the cut surface of the first electrode body 11, the connection portion of the lead terminal 7, and the like is repaired.
- the appearance and characteristics of the electrolytic capacitor 1 are inspected.
- the electrolytic capacitor 1 is completed.
- the conductive polymer particle band 23 in which the particles of the conductive polymer 22 extend in the longitudinal direction X of the separator 13 in a dense state is provided between the first electrode body 11 and the second electrode body 12. .
- the conductive polymer particle band 23 is at least half or more in the transverse direction Y of the separator 13 in at least one region (the first region 26 or the second region 27) with respect to the center line C in the transverse direction Y of the separator 13.
- the conductive polymer 22 is arranged in a wide range between the first electrode body 11 and the second electrode body 12. Therefore, the ESR of the electrolytic capacitor 1 can be reduced.
- the cellulose derivative 21 is contained in the conductive polymer particle zone 23.
- the viscosity of the electrolytic solution can be increased. Thereby, the evaporation of the electrolytic solution is suppressed even in a high-temperature environment, and an increase in the ESR of the electrolytic capacitor 1 over time can be suppressed.
- the cellulose derivative immersion step, the first drying step, the conductive polymer immersion step, and the second drying step are performed in this order. Then, the water in which the cellulose derivative 21 is dissolved changes to a physical gel in the second drying step. Thereby, the movement of the particles of the conductive polymer 22 can be reduced and the conductive polymer 22 can be easily arranged in a wide range.
- the cellulose derivative 21 is any one of methylcellulose, hydroxyethylmethylcellulose, hydroxyethylethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose, the water in which the cellulose derivative 21 is dissolved can be easily changed to a physical gel.
- the conductive polymer particle band 23 is provided between both ends of the separator 13 in the short direction Y, the conductive polymer 22 is disposed between the first electrode body 11 and the second electrode body 12. Distributed over a wider area. Therefore, the ESR of the electrolytic capacitor 1 can be further reduced.
- the conductive polymer particle band 23 is provided between one end of the separator 13 in the lateral direction Y and the central portion, the conductive polymer 22 is provided between the first electrode body 11 and the second electrode body. And a wider range between 12. Therefore, the ESR of the electrolytic capacitor 1 can be further reduced.
- the capacitor element 10 is immersed in the aqueous solution of the cellulose derivative 21 in the cellulose derivative immersion step, and dried in the first drying step. Then, the capacitor element 10 is immersed in the dispersion of the conductive polymer 22 in the conductive polymer immersion step, and dried in the second drying step.
- the dispersion of the conductive polymer 22 has a higher viscosity due to the dissolution of the cellulose derivative 21 held by the capacitor element 10, and the movement of the dispersion medium in the axial direction becomes slower during drying. Therefore, the movement of the particles of the conductive polymer 22 in the axial direction is suppressed, and the conductive polymer 22 is arranged in a wide range between the first electrode body 11 and the second electrode body 12. Therefore, the ESR of the electrolytic capacitor 1 can be reduced.
- the electrolytic capacitor 1 of Example 1 has a main body case 3 of ⁇ 6.3 mm ⁇ H7.7 mm and a capacitor element 10 having a rating of 63 V-15 ⁇ F.
- a boro-salicylic acid solution of ⁇ -butyrolactone is used as the electrolyte.
- the capacitor element 10 was immersed in an aqueous solution of hydroxypropylmethylcellulose.
- NEOVISCO registered trademark
- MC @ HM4000S manufactured by Sansho Co., Ltd. is used for hydroxypropyl methylcellulose.
- the concentration of the aqueous solution of the cellulose derivative is set to 0.5%.
- the concentration of the aqueous solution was set to 1.0% using the same hydroxypropyl methylcellulose as in Example 1 in the cellulose derivative immersion step. Other conditions are the same as in the first embodiment.
- the electrolytic capacitor 1 of the third embodiment uses hydroxypropyl methylcellulose (NEOVISCO-MC @ RM4000 manufactured by Sansho Co., Ltd.) having the same viscosity as that of the first embodiment and having a high gelation temperature in the cellulose derivative immersion step. .
- the concentration of the aqueous solution of the cellulose derivative is set to 0.5%. Other conditions are the same as in the first embodiment.
- the concentration of the aqueous solution was set to 1.0% using the same hydroxypropyl methylcellulose as in Example 3 in the cellulose derivative immersion step.
- Other conditions are the same as in the third embodiment.
- the electrolytic capacitor 1 of Example 5 uses hydroxypropylmethylcellulose (NEOVISCO-MC @ RM15000S manufactured by Sansho Co., Ltd.) having a higher viscosity and the same gelling temperature as Example 3 in the cellulose derivative immersion step.
- the concentration of the aqueous solution of the cellulose derivative is set to 0.5%.
- Other conditions are the same as in the third embodiment.
- the concentration of the aqueous solution was set to 1.0% using the same hydroxypropyl methylcellulose as in Example 5 in the cellulose derivative immersion step. Other conditions are the same as in the fifth embodiment.
- the electrolytic capacitor 1 of Example 7 uses hydroxypropyl methylcellulose (NEOVISCO-MC @ RM30000S manufactured by Sansho Co., Ltd.) having a higher viscosity and the same gelling temperature as Example 5 in the cellulose derivative immersion step.
- the concentration of the aqueous solution of the cellulose derivative is set to 0.5%.
- Other conditions are the same as in the fifth embodiment.
- the concentration of the aqueous solution was set to 1.0% using the same hydroxypropylmethylcellulose as in Example 7 in the cellulose derivative immersion step.
- Other conditions are the same as in the seventh embodiment.
- the electrolytic capacitor 1 was formed without the cellulose derivative immersion step.
- the conditions other than the cellulose derivative immersion step are the same as in Example 1.
- Table 1 shows the results of measuring the ESR (unit: m ⁇ ) at 100 kHz of each example and comparative example. As shown in Table 1, the ESR of the electrolytic capacitors 1 of Examples 1 to 8 was low, but the ESR of the comparative example was high. Thus, the ESR of the electrolytic capacitor 1 can be reduced by providing a cellulose derivative immersion step to form the conductive polymer particle band 23 to have a wider width in the short direction Y.
- the conductive polymer particle band 23 was formed between both ends of the separator 13 in the lateral direction Y as shown in FIG.
- Example 8 since the viscosity and concentration of the cellulose derivative were high, the conductive polymer particle band 23 was formed by being divided in the short direction Y of the separator 13 as shown in FIG.
- FIGS. 11A and 11B show SEM images of the first electrode body 11 of Example 1 and Comparative Example, respectively.
- the width W 'of the first electrode body 11 in the lateral direction Y is 5 mm.
- the black portion in the first electrode body 11 is the conductive polymer 22.
- Example 1 the conductive polymer particle band 23 in which the particles of the conductive polymer 22 are dense extends in the longitudinal direction X and is formed with a wide width in the transverse direction Y.
- the conductive polymer 22 is concentrated at both ends in the lateral direction Y, and is dispersed at the center. For this reason, the ESR of Example 1 can be made lower than the ESR of Comparative Example.
- 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 3a End wall 3b Perimeter wall 4
- Insulating sheet 5
- Sealing body 6
- Lead terminal 10
- Capacitor element 11
- 1st electrode body 12
- 2nd electrode body 13
- Separator 14
- Tape 21
- Conductivity Conductive polymer 23
- Conductivity Conductive polymer 23
- conductive polymer particle band 26
- first region 27
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
セパレータを介して第1電極体と第2電極体とを巻回して前記コンデンサ素子をロール状に形成する巻回工程と、
前記コンデンサ素子をセルロース誘導体の水溶液に浸漬するセルロース誘導体浸漬工程と、
前記水溶液から取り出した前記コンデンサ素子を乾燥させる第1乾燥工程と、
前記第1乾燥工程後に前記コンデンサ素子を導電性高分子の分散液に浸漬する導電性高分子浸漬工程と、
前記分散液から取り出した前記コンデンサ素子を乾燥させる第2乾燥工程と、
前記第2乾燥工程後に前記第1電極体と前記第2電極体との間に電解液を保持させる電解液保持工程とを備えることを特徴としている。
また、比較例として、セルロース誘導体浸漬工程を省いて電解コンデンサ1を形成した。セルロース誘導体浸漬工程以外の条件は実施例1と同一である。
2 コンデンサ本体
3 本体ケース
3a 端壁
3b 周壁
4 絶縁シート
5 封口体
6 座板
7、8 リード端子
10 コンデンサ素子
11 第1電極体
12 第2電極体
13 セパレータ
14 テープ
21 セルロース誘導体
22 導電性高分子
23 導電性高分子粒子帯
26 第1領域
27 第2領域
C 中心線
Claims (9)
- セパレータを介して第1電極体と第2電極体とを巻回して電解液を保持するコンデンサ素子を本体ケース内に収納した電解コンデンサにおいて、前記第1電極体と前記第2電極体との間に導電性高分子の粒子が稠密状態で前記セパレータの長手方向に延びて配される導電性高分子粒子帯を有し、前記導電性高分子粒子帯内にセルロース誘導体が含まれるとともに、前記導電性高分子粒子帯が前記セパレータの短手方向の中心線に対して少なくとも一方の領域内で、前記セパレータの短手方向に半分以上設けられることを特徴とする電解コンデンサ。
- 前記セルロース誘導体が前記電解液に含まれることを特徴とする請求項1に記載の電解コンデンサ。
- 前記セルロース誘導体が45℃以上の加熱によって水をゲル化させるゲル化剤であ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。
- 前記セルロース誘導体が、メチルセルロース、ヒドロキシエチルメチルセルロース、ヒドロキシエチルエチルセルロース、ヒドロキシプロピルセルロース、ヒドロキシプロピルメチルセルロースのいずれかであること特徴とする請求項3に記載の電解コンデンサ。
- 前記導電性高分子粒子帯が前記セパレータの短手方向の両端部間に亙って設けられることを特徴とする請求項1~請求項4のいずれかに記載の電解コンデンサ。
- 前記導電性高分子粒子帯が前記セパレータの短手方向の一端部と中央部との間に亙って設けられることを特徴とする請求項1~請求項4のいずれかに記載の電解コンデンサ。
- 電解液を保持するコンデンサ素子を本体ケース内に収納した電解コンデンサの製造方法において、
セパレータを介して第1電極体と第2電極体とを巻回して前記コンデンサ素子をロール状に形成する巻回工程と、
前記コンデンサ素子をセルロース誘導体の水溶液に浸漬するセルロース誘導体浸漬工程と、
前記水溶液から取り出した前記コンデンサ素子を乾燥させる第1乾燥工程と、
前記第1乾燥工程後に前記コンデンサ素子を導電性高分子の分散液に浸漬する導電性高分子浸漬工程と、
前記分散液から取り出した前記コンデンサ素子を乾燥させる第2乾燥工程と、
前記第2乾燥工程後に前記第1電極体と前記第2電極体との間に電解液を保持させる電解液保持工程とを備えることを特徴とする電解コンデンサの製造方法。 - 前記第2乾燥工程で前記コンデンサ素子を45℃以上の環境下で乾燥させることを特徴とする請求項7に記載の電解コンデンサの製造方法。
- 前記セルロース誘導体が、メチルセルロース、ヒドロキシエチルメチルセルロース、ヒドロキシエチルエチルセルロース、ヒドロキシプロピルセルロース、ヒドロキシプロピルメチルセルロースのいずれかであることを特徴とする請求項8に記載の電解コンデンサの製造方法。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18927658.7A EP3828906B1 (en) | 2018-07-26 | 2018-07-26 | Electrolytic capacitor |
| US16/973,669 US11545306B2 (en) | 2018-07-26 | 2018-07-26 | Electrolytic capacitor |
| PCT/JP2018/028097 WO2020021679A1 (ja) | 2018-07-26 | 2018-07-26 | 電解コンデンサ |
| CN201880094590.5A CN112335006A (zh) | 2018-07-26 | 2018-07-26 | 电解电容器 |
| JP2020532091A JP7076844B2 (ja) | 2018-07-26 | 2018-07-26 | 電解コンデンサ |
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| PCT/JP2018/028097 WO2020021679A1 (ja) | 2018-07-26 | 2018-07-26 | 電解コンデンサ |
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| PCT/JP2018/028097 Ceased WO2020021679A1 (ja) | 2018-07-26 | 2018-07-26 | 電解コンデンサ |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11545306B2 (ja) |
| EP (1) | EP3828906B1 (ja) |
| JP (1) | JP7076844B2 (ja) |
| CN (1) | CN112335006A (ja) |
| WO (1) | WO2020021679A1 (ja) |
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| WO2024171711A1 (ja) * | 2023-02-17 | 2024-08-22 | エルナー株式会社 | 電解コンデンサ素子及び電解コンデンサ |
| WO2025052748A1 (ja) * | 2023-09-04 | 2025-03-13 | 株式会社カーリット | 固体電解コンデンサの製造方法 |
| WO2025052792A1 (ja) * | 2023-09-04 | 2025-03-13 | エルナー株式会社 | 電解コンデンサ |
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| Publication number | Publication date |
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| JPWO2020021679A1 (ja) | 2021-08-02 |
| JP7076844B2 (ja) | 2022-05-30 |
| US20210257166A1 (en) | 2021-08-19 |
| CN112335006A (zh) | 2021-02-05 |
| EP3828906A4 (en) | 2022-03-02 |
| EP3828906A1 (en) | 2021-06-02 |
| EP3828906B1 (en) | 2025-09-03 |
| US11545306B2 (en) | 2023-01-03 |
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