WO2024070177A1 - 電解コンデンサ及びその製造方法 - Google Patents
電解コンデンサ及びその製造方法 Download PDFInfo
- Publication number
- WO2024070177A1 WO2024070177A1 PCT/JP2023/027392 JP2023027392W WO2024070177A1 WO 2024070177 A1 WO2024070177 A1 WO 2024070177A1 JP 2023027392 W JP2023027392 W JP 2023027392W WO 2024070177 A1 WO2024070177 A1 WO 2024070177A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weight
- conductive polymer
- electrolytic capacitor
- capacitor element
- pair
- 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
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
- H01G9/15—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
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
-
- 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
- H01G9/055—Etched 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
- H01G9/145—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
Definitions
- the present invention relates to an electrolytic capacitor and a method for manufacturing the same.
- Patent Document 1 describes an electrolytic capacitor that is manufactured by roughening the surface of an anode foil by etching to form a dielectric layer, and then immersing a wound body on which a conductive polymer film is formed in an electrolyte capable of repairing the dielectric layer.
- This type of electrolytic capacitor is known as a hybrid electrolytic capacitor, and is small, has a large capacity, and a low ESR (Equivalent Series Resistance), and is widely used, for example, as an electronic component for automotive applications.
- the surface of the anode foil is etched to create countless small holes called pits.
- a dielectric layer is formed on the inner walls of the pits, and tiny defects in the dielectric layer are repaired by the electrolyte that fills the pits.
- the ability to repair micro-defects in the dielectric layer decreases, which increases the number of micro-defects in the dielectric layer, causing leakage current and increasing the ESR.
- the ability of the electrolyte to fill the pits can be improved by reducing the conductive polymer, but this reduces the ESR.
- the ability of the electrolyte to fill the pits can be improved by performing an etching process to enlarge the pit entrance, but this reduces the number of pits, which reduces the capacitance.
- the present invention has been made in consideration of the above problems, and aims to provide a low-ESR electrolytic capacitor that can increase capacitance, and a method for manufacturing the same.
- the electrolytic capacitor of the present invention is an electrolytic capacitor comprising a capacitor element having a winding in which an anode foil and a cathode foil are wound with a separator holding a conductive polymer, and a pair of extraction electrodes connected to the anode foil and the cathode foil, characterized in that the ratio of the weight of the conductive polymer and liquid organic matter in the capacitor element to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes is 2.0 to 20.1 wt %.
- the ratio of the weight of the conductive polymer and the liquid organic material to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes may be 9.1 wt % or less.
- the ratio of the weight of the conductive polymer and the liquid organic material to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes may be 8.6 wt % or less.
- the ratio of the weight of the conductive polymer and the liquid organic material to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes may be 2.9 wt % or more.
- the ratio of the weight of the conductive polymer and the liquid organic material to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes may be 3.2 wt % or more.
- the thickness of the separator may be 1 to 100 ⁇ m.
- the thickness of the anode foil may be 5 to 200 ⁇ m.
- the method for manufacturing an electrolytic capacitor of the present invention includes the steps of: producing a capacitor element having a wound body in which an anode foil and a cathode foil are wound with a separator interposed therebetween, and a pair of extraction electrodes; immersing the wound body in a dispersion liquid or solution containing a conductive polymer and a liquid organic substance; and drying the wound body.
- the method is characterized in that, after the step of drying the wound body, the amount of the dispersion liquid or solution is adjusted in the step of immersing the wound body so that the ratio of the weight of the conductive polymer and the liquid organic substance to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes is 2.0 to 20.1 wt %.
- the amount of the dispersion liquid or the solution in the step of immersing the wound body may be adjusted so that the ratio of the weight of the conductive polymer and the liquid organic matter to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes is 9.1 wt % or less.
- the amount of the dispersion liquid or the solution in the step of immersing the wound body may be adjusted so that the ratio of the weight of the conductive polymer and the liquid organic matter to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes is 8.6 wt % or less.
- the amount of the dispersion liquid or the solution in the step of immersing the wound body may be adjusted so that the ratio of the weight of the conductive polymer and the liquid organic matter to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes is 2.9 wt % or more.
- the amount of the dispersion liquid or the solution in the step of immersing the wound body may be adjusted so that the ratio of the weight of the conductive polymer and the liquid organic matter to the weight of the capacitor element excluding the lead portions of the pair of extraction electrodes is 3.2 wt % or more.
- the concentration of the dispersion or solution may be 0.1 to 5.0 wt %.
- the thickness of the separator may be 1 to 100 ⁇ m.
- the thickness of the anode foil may be 5 to 200 ⁇ m.
- the present invention makes it possible to increase the capacitance of a capacitor element while suppressing its ESR.
- FIG. 1 is a side view illustrating an example of an aluminum electrolytic capacitor.
- FIG. 2 is a perspective view showing an example of a capacitor element.
- 3 is a cross-sectional view showing a part of a cross section taken along line AA in FIG. 2.
- FIG. 11 is a cross-sectional view showing a schematic view of a part of the boundary between an etching layer and a separator when the amount of a conductive polymer is appropriate.
- FIG. 2 is a cross-sectional view that illustrates a part of the boundary between an etching layer and a separator when the conductive polymer is excessively large.
- FIG. 2 is a plan view showing an example of an extraction electrode.
- 1 is a flowchart showing an example of a manufacturing process for an aluminum electrolytic capacitor.
- Fig. 1 is a side view showing an example of an aluminum electrolytic capacitor 1. In the right half of Fig. 1 across a center line L of the aluminum electrolytic capacitor 1, a cross section of the inside is shown.
- Aluminum electrolytic capacitor 1 is an example of an electrolytic capacitor, specifically a conductive polymer hybrid aluminum electrolytic capacitor.
- Aluminum electrolytic capacitor 1 is mounted on an electronic circuit board and is used, for example, for coupling, decoupling, and smoothing.
- the aluminum electrolytic capacitor 1 has a capacitor element 10, a case 11, a sealing body 12, a seat plate 13, a pair of round bar portions 111, and a pair of lead portions 110.
- the round bar portion 111 and the lead portion 110 are extraction electrodes of the capacitor element 10, and the lead portion 110 extends from the tip of the round bar portion 111. Note that while only one of the round bar portions 111 is shown in FIG. 1, the other round bar portion 111 is provided at a symmetrical position across the center line L.
- the case 11 is made of aluminum and has a cylindrical shape with the upper opening closed.
- the case 11 covers the capacitor element 10 and the sealing body 12, and functions as the exterior of the aluminum electrolytic capacitor 1.
- the shape of the case 11 is not limited to a cylindrical shape, and may be a square tube shape.
- the sealing body 12 is a substantially circular member made of an elastic material such as butyl rubber.
- the sealing body 12 is adjacent to the capacitor element 10 and seals the opening at the bottom of the case 11.
- the capacitor element 10 is configured by stacking and winding an anode foil, a cathode foil, and a separator (electrolytic paper).
- a pair of round bar portions 111 extend from the bottom of the capacitor element 10.
- the round bar portion 111 and the lead portion 110 are rod-shaped members made of aluminum or the like.
- the pair of round bar portions 111 are joined to the anode foil and cathode foil by a joining means such as crimping, respectively, and function as the anode terminal and cathode terminal of the aluminum electrolytic capacitor 1.
- Each round bar portion 111 is inserted into a pair of through holes 120 formed in the sealing body 12. Note that while only one of the through holes 120 is shown in FIG. 1, the other through hole 120 is provided at a symmetrical position across the center line L.
- the lead portion 110 has a flat plate shape and is bent into an L shape, with its tip portion extending along the surface of the base plate 13.
- the portion of the lead portion 110 on the round bar portion 111 side is inserted into the through hole 130 of the base plate 13.
- the lead portion 110 is soldered to a pad on the electronic circuit board during the reflow process of the electronic circuit board.
- the seat plate 13 is a plate-like member made of resin or the like, and is provided under the case 11 and the sealing body 12.
- the seat plate 13 supports the case 11 and the sealing body 12 with respect to the electronic circuit board to which they are to be mounted.
- the seat plate 13 is provided with a through hole 130 for the lead portion 110 and a groove portion 131 for accommodating the bent tip portion of the lead portion 110.
- the groove portion 131 extends from near the center to the outside along the bottom surface of the seat plate 13.
- the bottom surface of the seat plate 13 becomes the mounting surface of the aluminum electrolytic capacitor 1 for the electronic circuit board, so that the plate-like lead portion 110 can be soldered to a pad on the electronic circuit board.
- FIG. 2 is a perspective view showing an example of a capacitor element 10.
- Capacitor element 10 has a wound body 100 in which an anode foil 101, a cathode foil 102, and a separator (electrolytic paper) 103 are wound, and a pair of extraction electrodes 19 connected to the anode foil 101 and the cathode foil 102.
- a pair of lead electrodes 19 extend below the wound body 100.
- the round bar portion 111 of each lead electrode 19 is connected to the anode foil 101 and the cathode foil 102, respectively. Note that FIG. 2 shows the state before the lead portion 110 is bent.
- the anode foil 101 and the cathode foil 102 are formed of valve metals such as aluminum, tantalum, titanium, and niobium, and alloy foils and evaporated foils of these metals.
- the surface of the anode foil 101 is etched to increase the electrode area. This ensures that the capacitor element 10 has a predetermined capacitance.
- an extremely thin oxide film is formed on the surface of the anode foil 101. This insulates the anode foil 101 from other components.
- the oxide film functions as a dielectric, allowing the capacitor element 10 to function as a capacitor.
- the thickness of the anode foil 101 is, for example, 5 to 200 ( ⁇ m). This thickness range is preferable because it allows an appropriate balance to be achieved between the strength of the anode foil 101 and the amount of capacitance expressed.
- no oxide film is formed on the surface of the cathode foil 102.
- the surface of the cathode foil 102 may also be subjected to an etching process.
- an oxide film may be formed on the surface of the cathode foil 102, or an inorganic layer or a carbon layer may be formed.
- the separator 103 is wound while being sandwiched between the anode foil 101 and the cathode foil 102.
- the separator 103 is made of at least one material selected from cellulose, rayon, glass fiber, etc.
- the wound body 100 formed by winding the anode foil 101, the cathode foil 102, and the separator 103 is immersed in a dispersion or solution of an electrolyte and a conductive polymer during the manufacturing process of the aluminum electrolytic capacitor 1.
- the thickness of the separator 103 is, for example, 1 to 100 ( ⁇ m). This thickness range is preferable because it maintains a good balance between the strength, insulation, porosity, and conductive material of the separator 103.
- the electrolyte may contain polyhydric alcohols, sulfone compounds, lactone compounds, carbonate compounds, diether compounds of polyhydric alcohols, monohydric alcohols, etc. These may be used alone or in combination.
- the polyhydric alcohol preferably contains at least one of the following: ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butanediol, polyalkylene glycol, and glycerin.
- ethylene glycol diethylene glycol, triethylene glycol, propylene glycol, butanediol, polyalkylene glycol, and glycerin.
- polyalkylene glycol it is preferable to use polyethylene glycol with an average molecular weight of 200 to 1000, or polypropylene glycol with an average molecular weight of 200 to 5000.
- lactone compounds ⁇ -butyrolactone, ⁇ -valerolactone, etc.
- carbonate compounds dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, propylene carbonate, fluoroethylene carbonate, etc. can be included as a solvent.
- the electrolyte may contain a solute.
- solutes acid components, base components, salts consisting of acid components and base components, nitro compounds, phenol compounds, etc. can be used.
- the acid component may be an organic acid, an inorganic acid, or a composite compound of an organic acid and an inorganic acid.
- Organic acids include carboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, maleic acid, succinic acid, glutaric acid, adipic acid, benzoic acid, 4-hydroxybenzoic acid, 1,6-decanedicarboxylic acid, 1,7-octanedicarboxylic acid, and azelaic acid.
- Inorganic acids include boric acid, phosphoric acid, phosphorous acid, hypophosphorous acid, phosphate esters, and phosphate diesters.
- borodisalicylic acid As a composite compound of an organic acid and an inorganic acid, borodisalicylic acid, borodisalic acid, borodiglycolic acid, etc. can be used.
- the base component may be a primary to tertiary amine, a quaternary ammonium, a quaternary amidinium, etc.
- the primary to tertiary amine that may be used include methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, ethylenediamine, N,N-diisopropylethylamine, tetramethylethylenediamine, hexamethylenediamine, and aniline.
- Examples of the quaternary ammonium that may be used include tetramethylammonium, triethylmethylammonium, and tetraethylammonium.
- the quaternary amidinium that may be used include ethyldimethylimidazolinium and tetramethylimidazolinium.
- the conductive polymer is not particularly limited as long as it is a polymer that has conductivity.
- at least one polymer selected from the group consisting of polythiophene, polypyrrole, polyaniline, and derivatives thereof is used as the conductive polymer.
- polyethylenedioxythiophene (PEDOT) is used as the conductive polymer, with at least one acid selected from the group consisting of p-toluenesulfonic acid, polystyrenesulfonic acid (PSS), etc., as a dopant.
- FIG. 3 is a cross-sectional view showing a portion of the cross section taken along line A-A in FIG. 2.
- the separator 103 is sandwiched between the anode foil 101 and the cathode foil 102.
- the anode foil 101 has etching layers 31 adjacent to the separators 103 on both sides, and an aluminum layer 30 between each etching layer 31.
- the cathode foil 102 is thinner than the anode foil 101.
- Separator 103 functions as a retention layer for the conductive polymer. As described below, the electrical characteristics of aluminum electrolytic capacitor 1 are affected by the amount of conductive polymer in separator 103.
- Figure 4 is a cross-sectional view that shows a schematic of a portion of the boundary between the etching layer 31 and the separator 103 when the amount of conductive polymer is appropriate.
- the left side of Figure 4 shows the state after the capacitor element 10 has been immersed in a dispersion or solution of the conductive polymer and before it has been immersed in the electrolyte in the manufacturing method of the aluminum electrolytic capacitor 1. Meanwhile, the right side of Figure 4 shows the state after the capacitor element 10 has been immersed in the electrolyte in the manufacturing method of the aluminum electrolytic capacitor 1.
- a large number of pits 33 are formed on the surface of the etching layer 31 by the etching process.
- a dielectric layer 32 which is an oxide film, is formed on the surface of the etching layer 31, including the inner walls of the pits 33. As shown by the dotted circles, the dielectric layer 32 has tiny defects that occurred during the manufacturing process and use after manufacturing.
- the capacitor element 10 by immersing the capacitor element 10 in a conductive polymer dispersion or solution, a large number of conductive polymer nanoparticles 4 are held on the separator 103. After immersing the capacitor element 10 in the conductive polymer dispersion or solution, the capacitor element 10 is dried, causing the nanoparticles 4 to aggregate and form a conductive polymer layer 40.
- nanoparticles 4 enter the pits 33 and adhere to the etching layer 31 inside the pits 33.
- Other nanoparticles 4 adhere near the entrance of the pits 33.
- the electrolyte fills not only the separator 103 but also the pits 33.
- the electrolyte repairs minute defects in the dielectric layer 32. Specifically, when the exposed aluminum in the minute defective area comes into contact with the electrolyte and a voltage is applied, chemical conversion progresses and the oxide film is reformed.
- FIG. 5 is a cross-sectional view showing a schematic of a portion of the boundary between the etching layer 31 and the separator 103 when there is an excessive amount of conductive polymer.
- the left side of FIG. 5 shows the state after the capacitor element 10 has been immersed in a dispersion or solution of the conductive polymer and before it has been immersed in the electrolyte during the manufacturing process of the aluminum electrolytic capacitor 1. Meanwhile, the right side of FIG. 5 shows the state after the capacitor element 10 has been immersed in the electrolyte during the manufacturing process of the aluminum electrolytic capacitor 1. Note that in FIG. 5, components that are common to FIG. 4 are given the same reference numerals and their explanations are omitted.
- the capacitor element 10 is immersed in a larger amount of conductive polymer dispersion or solution than in the example of Figure 4.
- This causes the conductive polymer nanoparticles 4 in the separator 103 to increase in number, and the conductive polymer layer 40 to become thicker due to the higher density, with the entrances of some pits 33 being blocked by the adhesion of the nanoparticles 4.
- the electrolyte has difficulty passing through the conductive polymer layer 40, resulting in the formation of pits 33 that are not filled with electrolyte.
- the capacitance of the aluminum electrolytic capacitor 1 decreases. Furthermore, since no oxide film is formed in the minute defects of the dielectric layer 32, leakage current (LC) occurs, which may increase the LC of the aluminum electrolytic capacitor 1. Furthermore, by performing an etching process to enlarge the entrance of the pits, the filling of the electrolyte into the pits 33 can be improved, but the number of pits 33 will decrease, which may reduce the capacitance.
- LC leakage current
- the aluminum electrolytic capacitor 1 is manufactured so that the ratio of the weight of the conductive polymer and liquid organic matter in the capacitor element 10 to the weight of the capacitor element 10 excluding the lead portion 110 (hereinafter referred to as the polymer weight ratio) is 2.0 to 20.1 (wt%).
- the liquid organic matter is a high-boiling point solvent contained in the conductive polymer dispersion or solution, and is a high-boiling point solvent that remains in the separator 103 after the capacitor element is immersed in the conductive polymer dispersion or solution and dried in the manufacturing process of the aluminum electrolytic capacitor 1.
- high-boiling point solvents include, but are not limited to, diethylene glycol, triethylene glycol, polyethylene glycol, polyethylene glycol monoalkyl ether, and polyethylene glycol dialkyl ether, among solvents with a boiling point of 220°C or higher.
- the conductive polymer dispersion or solution may also contain moisture, but the moisture evaporates when dried after immersion.
- the polymer weight ratio is preferably 9.1 (wt%) or less, and more preferably 8.6 (wt%) or less. This range can increase the efficiency of impregnation of the electrolyte after impregnation with the conductive polymer.
- the polymer weight ratio is also preferably 2.9 (wt%) or more, and more preferably 3.2 (wt%) or more. This range can maintain a low ESR in the aluminum electrolytic capacitor 1 due to the formation of the conductive polymer layer.
- the reason why the polymer weight ratio is defined by the weight of the capacitor element 10 excluding the lead portion 110 is as follows.
- FIG. 6 is a plan view showing an example of an extraction electrode 19.
- the extraction electrode 19 has a flat portion 112, a round bar portion 111, and a lead portion 110.
- the flat portion 112 is a flat plate-shaped portion provided at one end of the round bar portion 111 opposite the lead portion 110, and is formed, for example, by pressing one end of the round bar portion 111.
- the flat portion 112 is connected to the anode foil 101 and the cathode foil 102 by crimping, and is not exposed to the outside because it is located inside the wound body 100.
- the weight of the capacitor element 10 is defined as the numerical value when the lead portion 110 is cut off from the end of the round bar portion 111 along the cutting line C.
- the length of the lead portion 110 is determined according to the type of product, etc. Therefore, by cutting off the lead portion 110 from the capacitor element 10, the effect of the length of the lead portion 110 on the weight of the capacitor element 10 can be eliminated when calculating the polymer weight ratio.
- (Electrolytic capacitor manufacturing process) 7 is a flow chart showing an example of a manufacturing process of the aluminum electrolytic capacitor 1.
- an anode foil 101, a cathode foil 102, a separator 103, and the like are prepared.
- the thickness of the anode foil 101 is 5 to 200 ( ⁇ m)
- the thickness of the separator is 1 to 100 ( ⁇ m).
- Pits 33 are formed on the surfaces of the anode foil 101 and the cathode foil 102 by etching.
- the anode foil 101 is subjected to a chemical conversion treatment, and a dielectric layer 32 of an oxide film is formed on the etched surface.
- a pair of lead electrodes 19 are connected to the anode foil 101 and the cathode foil 102, respectively.
- An example of a means for connecting the lead electrodes 19 is crimping, but is not limited thereto.
- Step St1 is an example of a process for producing a capacitor element 10.
- the wound body 100 is immersed in, for example, an ammonium phosphate aqueous solution, and a re-chemical treatment is performed while applying a predetermined voltage to the anode foil 101, thereby repairing the oxide film and forming a dielectric layer 32 on the surface of the cut end of the anode foil 101 (step St2).
- the wound body 100 is immersed in a dispersion liquid of a conductive polymer, and the dispersion liquid is impregnated into the wound body 100 (step St3).
- the wound body 100 may be immersed in a solution containing a conductive polymer.
- the wound body 100 is dried (step St4). At this time, the liquid organic matter contained in the dispersion liquid or solution is retained as residue in the capacitor element 10.
- the amount of conductive polymer dispersion or solution is adjusted in advance in step St4 so that the polymer weight ratio measured after completion of this process is 2.0 to 20.1 (wt%).
- the polymer weight ratio is preferably 9.1 (wt%) or less, and more preferably 8.6 (wt%) or less.
- the polymer weight ratio is preferably 2.9 (wt%) or more, and more preferably 3.2 (wt%) or more.
- the concentration of the conductive polymer dispersion or solution is 0.1 to 5.0 (wt%).
- the capacitor element 10 is impregnated with the electrolyte in a reduced pressure atmosphere (step St5).
- the capacitor element 10 is then housed in the case 11 and sealed with the sealing body 12 (step St6).
- the extraction electrode 19 extending from the capacitor element 10 is inserted into the through hole 120 of the sealing body 12.
- an aging process may be performed while applying a rated voltage to the aluminum electrolytic capacitor 1. In this manner, the manufacturing process for the aluminum electrolytic capacitor 1 is performed.
- Samples No. 1 to 38 of aluminum electrolytic capacitor 1 were produced according to the above manufacturing method.
- Samples No. 1 to 19 are aluminum electrolytic capacitors 1 with a rated voltage and rated capacitance of 25 V and 470 ⁇ F, respectively
- Samples No. 20 to 38 are aluminum electrolytic capacitors 1 with a rated voltage and rated capacitance of 63 V and 56 ⁇ F, respectively.
- the case size of Samples No. 1 to 38 was 10 mm in diameter x 10 mm in length.
- the voltage applied in the re-chemical conversion treatment of capacitor element 10 was 56 V for Samples No. 1 to 19, and 143 V for Samples No. 20 to 38.
- the amount of dispersion was adjusted so that the polymer weight ratio was 1.7 to 21.5 (wt%).
- the polymer weight ratio was varied for each of samples No. 1 to No. 38.
- the capacitor element 10 was impregnated with a specified amount of electrolyte in a reduced pressure atmosphere.
- Table 1 shows the evaluation results of samples No. 1 to 15, in which the rated voltage and rated capacitance of the aluminum electrolytic capacitor 1 are 25 V and 470 ⁇ F, respectively.
- Table 1 shows the polymer weight ratio (wt%), capacitance ( ⁇ F), ESR ( ⁇ ), and evaluation results for samples No. 1 to 15.
- the polymer weight ratio was calculated using the weight of the conductive polymer and organic matter in the capacitor element 10 excluding the lead portions 110 of the pair of extraction electrodes 19.
- the evaluation criteria for example, a sample with a capacitance of 430 ( ⁇ F) or more and an ESR of 0.020 ( ⁇ ) or less was deemed OK, and a sample that did not meet these conditions was deemed NG. These criteria are determined according to predetermined standards.
- the polymer weight ratio of sample No. 19 is larger than that of the other samples No. 2 to 18. For this reason, the amount of conductive polymer held by the separator is excessively large, and as described with reference to FIG. 5, the entrances of many of the pits 33 are blocked by nanoparticles 4 of the conductive polymer, which prevents the electrolyte from filling the pits 33 sufficiently, resulting in a lower capacitance than the other samples No. 2 to 18. Therefore, the evaluation result for sample No. 19 was NG.
- the polymer weight ratio of sample No. 1 is smaller than that of the other samples No. 2 to 19. Therefore, the amount of conductive polymer held by the separator is small, and therefore there are few pits 33 whose entrances are blocked by nanoparticles 4 of the conductive polymer, and the pits 33 are filled with a sufficient amount of electrolyte, ensuring sufficient capacitance. However, because the amount of conductive polymer is too small, the ESR increases. Therefore, the judgment result for sample No. 1 was NG.
- the polymer weight ratios of samples No. 2 to 18 are 2.0 to 20.1 (wt%), which is greater than the polymer weight ratio of 1.8 (wt%) of sample No. 1 and smaller than the polymer weight ratio of 21.5 (wt%) of sample No. 19. Therefore, compared to sample No. 19, the conductive polymer held by the separator is reduced, and the conductive polymer layer 40 has an appropriate thickness. As a result, there are fewer pits 33 whose entrances are blocked by the conductive polymer nanoparticles 4, and the pits 33 are filled with a sufficient amount of electrolyte, ensuring sufficient capacitance. On the other hand, compared to sample No. 1, the amount of conductive polymer is greater, resulting in a lower ESR. Therefore, the judgment results for samples No. 2 to 18 were OK.
- Table 2 shows the evaluation results of samples No. 20 to 38, in which the rated voltage and rated capacitance of the aluminum electrolytic capacitor 1 are 63 V and 56 ⁇ F, respectively.
- Table 2 shows the polymer weight ratio (wt%), capacitance ( ⁇ F), ESR ( ⁇ ), and evaluation results for samples No. 20 to 38.
- the polymer weight ratio was calculated using the weight of the conductive polymer and organic matter in the capacitor element 10 excluding the lead portions 110 of the pair of extraction electrodes 19.
- the evaluation criteria for example, a sample with a capacitance of 50 ( ⁇ F) or more and an ESR of 0.02 ( ⁇ ) or less was deemed OK, and a sample that did not meet these conditions was deemed NG. These criteria are determined according to predetermined standards.
- the polymer weight ratio of sample No. 38 is larger than that of the other samples No. 20 to 37. For this reason, the amount of conductive polymer held by the separator is excessively large, and as described with reference to FIG. 5, the entrances of many of the pits 33 are blocked by nanoparticles 4 of the conductive polymer, which prevents the electrolyte from filling the pits 33 sufficiently, resulting in a lower capacitance than the other samples No. 20 to 37. Therefore, the evaluation result for sample No. 38 was NG.
- the polymer weight ratio of sample No. 20 is smaller than the other samples No. 21 to 38. Therefore, the amount of conductive polymer held by the separator is small, so there are few pits 33 whose entrances are blocked by nanoparticles 4 of the conductive polymer, and the pits 33 are filled with a sufficient amount of electrolyte, ensuring sufficient capacitance. However, because the amount of conductive polymer is too small, the ESR increases. Therefore, the judgment result for sample No. 20 was NG.
- the polymer weight ratios of samples No. 21 to 37 are 2.1 to 19.9 (wt%), which is greater than the polymer weight ratio of 1.7 (wt%) of sample No. 20 and smaller than the polymer weight ratio of 20.7 (wt%) of sample No. 38. Therefore, compared to sample No. 38, the conductive polymer layer 40 has an appropriate thickness due to the smaller amount of conductive polymer held by the separator. As a result, there are fewer pits 33 whose entrances are blocked by the conductive polymer nanoparticles 4, and the pits 33 are filled with a sufficient amount of electrolyte, ensuring sufficient capacitance. On the other hand, compared to sample No. 20, the amount of conductive polymer is greater, resulting in a lower ESR. Therefore, the judgment results for samples No. 21 to 37 were OK.
- the polymer weight ratio is preferably 9.1 (wt%) or less, and more preferably 8.6 (wt%) or less.
- the polymer weight ratio is preferably 2.9 (wt%) or more, and more preferably 3.2 (wt%) or less. Note that in this embodiment, a dispersion of a conductive polymer was used, but similar results were obtained when a solution of a conductive polymer was used.
- the capacitor element 10 is immersed in distilled water at 40°C and left for one hour. In this way, the electrolyte in the capacitor element 10 is extracted into the distilled water, and the electrolyte is removed.
- the capacitor element 10 from which the electrolyte has been removed is dried at 100°C for one hour to evaporate the distilled water, and the total weight of the capacitor element 10 at this point is measured.
- the dried capacitor element 10 is disassembled and separated into the anode foil 101, the cathode foil 102, the two separators 103, the anode and cathode lead electrodes 19 with the lead portions 110 cut off, and the element fixing tape (not shown).
- the anode foil 101, the cathode foil 102, the two separators 103, the anode and cathode lead electrodes 19, and the element fixing tape are each subjected to a thermal analysis in an oxygen atmosphere using a thermal analysis device (Tg-DTA: Thermogravimetry Differential Thermal Analysis).
- Tg-DTA Thermogravimetry Differential Thermal Analysis
- the weight of the high-boiling point solvent contained in the capacitor element 10 can also be measured.
- the total reduction in the weight of the conductive polymer and high-boiling point solvent for each part of the capacitor element 10 obtained in this way is the weight of the conductive polymer dispersion.
- the ratio of the weight of this conductive polymer dispersion to the total weight of the capacitor element 10 dried after washing with the electrolyte is calculated as the polymer weight ratio.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
(アルミ電解コンデンサの構成)
図1は、アルミ電解コンデンサ1の一例を示す側面図である。図1の紙面において、アルミ電解コンデンサ1の中心線Lを挟んだ右半分には、その内部の断面が示されている。
図2は、コンデンサ素子10の一例を示す斜視図である。図2において、図1と共通する構成には同一の符号を付し、その説明は省略する。コンデンサ素子10は、陽極箔101、陰極箔102、及びセパレータ(電解紙)103を巻回した巻回体100と、陽極箔101及び陰極箔102に接続された一対の引き出し電極19とを有する。
図7は、アルミ電解コンデンサ1の製造工程の一例を示すフローチャートである。アルミ電解コンデンサ1の製造にあたって、陽極箔101、陰極箔102、及びセパレータ103などを準備する。例えば、陽極箔101の厚みは5~200(μm)であり、セパレータの厚みは1~100(μm)である。陽極箔101及び陰極箔102の各表面には、エッチング処理によりピット33が形成されている。陽極箔101には化成処理が施され、エッチング処理された表面上に酸化被膜の誘電体層32が形成されている。また、陽極箔101及び陰極箔102には、一対の引き出し電極19がそれぞれ接続されている。引き出し電極19を接続手段としては、一例としてかしめが挙げられるが、これに限定されない。
アルミ電解コンデンサ1のサンプルNo.1~38の各々の静電容量およびESRを測定した。4端子測定用のLCRメータを用いて、電解コンデンサの周波数が120Hzであるときの静電容量(初期静電容量)(μF)、及び、電解コンデンサの周波数が100kHzであるときのESR(初期ESR)(mΩ)を測定した。
次に高分子重量比の算出方法を述べる。アルミ電解コンデンサ1からケースを取り外してコンデンサ素子10を取り出す。コンデンサ素子10の一対の引き出し電極19のリード部110を丸棒部111の根元からニッパー等で切断する。なお、切断は、図7に示された切断線Cに従う。
Claims (15)
- 導電性高分子を保持したセパレータを介し、陽極箔と、陰極箔とが巻回された巻回体と、前記陽極箔及び前記陰極箔に接続された一対の引き出し電極とを有するコンデンサ素子を備えた電解コンデンサにおいて、
前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する、前記コンデンサ素子内の前記導電性高分子及び液体有機物の重量の比が、2.0~20.1wt%であることを特徴とする電解コンデンサ。 - 前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、9.1wt%以下であることを特徴とする請求項1に記載の電解コンデンサ。
- 前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、8.6wt%以下であることを特徴とする請求項1に記載の電解コンデンサ。
- 前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、2.9wt%以上であることを特徴とする請求項1に記載の電解コンデンサ。
- 前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、3.2wt%以上であることを特徴とする請求項1に記載の電解コンデンサ。
- 前記セパレータの厚みは、1~100μmであることを特徴とする請求項1乃至5の何れかに記載の電解コンデンサ。
- 前記陽極箔の厚みは、5~200μmであることを特徴とする請求項1乃至5の何れかに記載の電解コンデンサ。
- 陽極箔と、陰極箔とを、セパレータを介して巻回した巻回体と、一対の引き出し電極とを有するコンデンサ素子を生成する工程と、
導電性高分子及び液体有機物を含む分散液または溶液に前記巻回体を浸漬する工程と、
前記巻回体を乾燥させる工程とを有し、
前記巻回体を乾燥させる工程の後、前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、2.0~20.1wt%となるように、前記巻回体を浸漬する工程において、前記分散液または前記溶液の量を調整することを特徴とする電解コンデンサの製造方法。 - 前記巻回体を乾燥させる工程の後、前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、9.1wt%以下となるように、前記巻回体を浸漬する工程における前記分散液または前記溶液の量を調整す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。
- 前記巻回体を乾燥させる工程の後、前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、8.6wt%以下となるように、前記巻回体を浸漬する工程における前記分散液または前記溶液の量を調整す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。
- 前記巻回体を乾燥させる工程の後、前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、2.9wt%以上となるように、前記巻回体を浸漬する工程における前記分散液または前記溶液の量を調整す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。
- 前記巻回体を乾燥させる工程の後、前記一対の引き出し電極のリード部を除いた前記コンデンサ素子の重量に対する前記導電性高分子及び前記液体有機物の重量の比が、3.2wt%以上となるように、前記巻回体を浸漬する工程における前記分散液または前記溶液の量を調整す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。
- 前記分散液または前記溶液の濃度は、0.1~5.0wt%であることを特徴とする請求項8乃至12の何れかに記載の電解コンデンサの製造方法。
- 前記セパレータの厚みは、1~100μmであることを特徴とする請求項8乃至12の何れかに記載の電解コンデンサの製造方法。
- 前記陽極箔の厚みは、5~200μmであることを特徴とする請求項8乃至12の何れかに記載の電解コンデンサの製造方法。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380069387.3A CN119998905A (zh) | 2022-09-29 | 2023-07-26 | 电解电容器及其制造方法 |
| EP23871420.8A EP4597529A4 (en) | 2022-09-29 | 2023-07-26 | ELECTROLYTIC CAPACITOR AND ITS MANUFACTURING PROCESS |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022156708A JP2024050093A (ja) | 2022-09-29 | 2022-09-29 | 電解コンデンサ及びその製造方法 |
| JP2022-156708 | 2022-09-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024070177A1 true WO2024070177A1 (ja) | 2024-04-04 |
Family
ID=90477010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2023/027392 Ceased WO2024070177A1 (ja) | 2022-09-29 | 2023-07-26 | 電解コンデンサ及びその製造方法 |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4597529A4 (ja) |
| JP (1) | JP2024050093A (ja) |
| CN (1) | CN119998905A (ja) |
| WO (1) | WO2024070177A1 (ja) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011199089A (ja) * | 2010-03-23 | 2011-10-06 | Nippon Chemicon Corp | 固体電解コンデンサ |
| JP2013026536A (ja) * | 2011-07-25 | 2013-02-04 | Panasonic Corp | 電解コンデンサおよびその製造方法 |
| WO2015146070A1 (ja) * | 2014-03-27 | 2015-10-01 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
| JP2016076680A (ja) * | 2014-10-03 | 2016-05-12 | ルビコン株式会社 | 固体電解コンデンサ及びその製造方法 |
| WO2017090241A1 (ja) | 2015-11-27 | 2017-06-01 | パナソニックIpマネジメント株式会社 | 電解コンデンサおよびその製造方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7117552B2 (ja) * | 2015-05-28 | 2022-08-15 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
| JP7496519B2 (ja) * | 2019-01-31 | 2024-06-07 | パナソニックIpマネジメント株式会社 | 導電性高分子分散液、電解コンデンサならびに電解コンデンサの製造方法 |
-
2022
- 2022-09-29 JP JP2022156708A patent/JP2024050093A/ja active Pending
-
2023
- 2023-07-26 CN CN202380069387.3A patent/CN119998905A/zh active Pending
- 2023-07-26 WO PCT/JP2023/027392 patent/WO2024070177A1/ja not_active Ceased
- 2023-07-26 EP EP23871420.8A patent/EP4597529A4/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011199089A (ja) * | 2010-03-23 | 2011-10-06 | Nippon Chemicon Corp | 固体電解コンデンサ |
| JP2013026536A (ja) * | 2011-07-25 | 2013-02-04 | Panasonic Corp | 電解コンデンサおよびその製造方法 |
| WO2015146070A1 (ja) * | 2014-03-27 | 2015-10-01 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
| JP2016076680A (ja) * | 2014-10-03 | 2016-05-12 | ルビコン株式会社 | 固体電解コンデンサ及びその製造方法 |
| WO2017090241A1 (ja) | 2015-11-27 | 2017-06-01 | パナソニックIpマネジメント株式会社 | 電解コンデンサおよびその製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4597529A1 (en) | 2025-08-06 |
| CN119998905A (zh) | 2025-05-13 |
| JP2024050093A (ja) | 2024-04-10 |
| EP4597529A4 (en) | 2026-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017026378A1 (ja) | 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 | |
| US20260011508A1 (en) | Electrolytic capacitor and production method therefor | |
| JP2017037950A (ja) | 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 | |
| CN114520116A (zh) | 电解电容器 | |
| CN115954211B (zh) | 电解电容器的制造方法及电解电容器 | |
| JP7308405B2 (ja) | 電解コンデンサ及び電解コンデンサの製造方法 | |
| WO2020022471A1 (ja) | 電解コンデンサ | |
| US12183519B2 (en) | Electrolytic capacitor and production method therefor | |
| JP2019029498A (ja) | 電解コンデンサおよび電解コンデンサ用電解液 | |
| CN117136421A (zh) | 电解电容器、阴极体和电解电容器的制造方法 | |
| WO2025004585A1 (ja) | 化成液、電解コンデンサの製造方法、及び電解コンデンサ | |
| WO2024070177A1 (ja) | 電解コンデンサ及びその製造方法 | |
| WO2024062720A1 (ja) | 電解コンデンサ及びその製造方法 | |
| JP7456242B2 (ja) | 固体電解コンデンサ | |
| JP2024117446A (ja) | 電解コンデンサ素子及び電解コンデンサ | |
| JP2024004120A (ja) | 電解コンデンサおよびその製造方法 | |
| WO2024171781A1 (ja) | 電解コンデンサ素子の浸漬方法、及び電解コンデンサの製造方法 | |
| WO2025028056A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 | |
| WO2024236977A1 (ja) | 電解コンデンサ素子及びその製造方法 | |
| WO2025052792A1 (ja) | 電解コンデンサ | |
| WO2024181210A1 (ja) | 電解コンデンサおよびその製造方法 | |
| WO2024116845A1 (ja) | 電解コンデンサの製造方法、電解コンデンサ、第1処理液、および第2処理液 | |
| WO2025028055A1 (ja) | 電解コンデンサおよび電解コンデンサの製造方法 | |
| WO2024004616A1 (ja) | 電解コンデンサおよびその製造方法 | |
| WO2024070603A1 (ja) | 固体電解コンデンサ及び製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23871420 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 202380069387.3 Country of ref document: CN |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2023871420 Country of ref document: EP |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| ENP | Entry into the national phase |
Ref document number: 2023871420 Country of ref document: EP Effective date: 20250429 |
|
| WWP | Wipo information: published in national office |
Ref document number: 202380069387.3 Country of ref document: CN |
|
| WWP | Wipo information: published in national office |
Ref document number: 2023871420 Country of ref document: EP |