JP2008047633A - Electrolytic capacitor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolytic capacitor which is easily impregnated with an electrolyte. <P>SOLUTION: The electrolytic capacitor 10 is equipped with an anode formation foil 1, an cathode foil 2, separator papers 3a and 3b, a winding-stop tape 4, an element through-hole 6, lead tab terminals 7 and 8, an anode lead wire 9, and a cathode lead wire 11. A capacitor element 5 has a configuration composed of the anode formation foil 1, cathode foil 2, and separator papers 3a and 3b which are rolled up. The capacitor element 5 is nearly columnar. The element through-hole 6 is provided to the capacitor element 5 penetrating through it in its radial direction from nearly its center. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wound electrolytic capacitor and a method for manufacturing the same.

  In recent years, miniaturization of electric circuits and high frequency response have been demanded, and accordingly, the impedance of capacitors must be reduced. In particular, a circuit for CPU (Central Processing Unit) driving and a switching power supply circuit are required to absorb high frequency noise and ripple current in circuit design, and can be reduced in ESR (equivalent series resistance). Capacitors are required.

As a capacitor capable of lowering ESR, a wound electrolytic capacitor has attracted attention, and an electrolytic capacitor described in Patent Document 1 is known as a high-capacity electrolytic capacitor. This electrolytic capacitor has a structure in which separator paper is inserted and wound between two anode foils and one cathode foil, and etching pit holes are formed in the two anode foils by tunnel etching. . The holes of the etching pits are provided to increase the surface area of the anode foil, and are formed by etching the anode foil at a high magnification.
Japanese Utility Model Publication No. 7-14640

  However, in the conventional electrolytic capacitor, the etching pit hole is provided to increase the surface area of the anode foil. Therefore, the electrolyte solution is applied to the capacitor element having a substantially columnar shape wound with the anode foil, the cathode foil, and the separator paper. There is a problem that it is difficult to impregnate. In addition, since the surface area of the anode foil is increased and the number of windings is increased in order to increase the capacity significantly, it becomes more remarkable that it is difficult to impregnate the electrolyte solution. As a result, the coverage of the electrolyte on the dielectric decreases, causing a decrease in the capacitance of the electrolytic capacitor and an increase in equivalent series resistance.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide an electrolytic capacitor in which an electrolyte solution can easily enter.

  Another object of the present invention is to provide a method for manufacturing an electrolytic capacitor in which an electrolyte solution can easily penetrate.

  According to this invention, the electrolytic capacitor is a wound electrolytic capacitor including an electrolyte, and includes an anode member, a cathode member, a separator member, and a member through hole. The anode member is wound with a dielectric film formed on the surface. The cathode member is wound together with the anode member. The separator member is disposed between the anode member and the cathode member, and is wound together with the anode member and the cathode member. The member through hole is formed in at least one member of an anode member, a cathode member, and a separator member. And in the anode member in which the member through hole is formed, the electrolyte is formed on the front and back surfaces of the anode member through the member through hole.

  According to this invention, the electrolytic capacitor is a wound electrolytic capacitor including an electrolyte, and includes an anode member, a cathode member, a separator member, and a member through hole. The anode member is wound with a dielectric film formed on the surface. The cathode member is wound together with the anode member. The separator member is disposed between the anode member and the cathode member, and is wound together with the anode member and the cathode member. The member through hole is formed in at least two members of an anode member, a cathode member, and a separator member.

  Preferably, the member through hole is formed in all of the anode member, the cathode member, and the separator member.

  Preferably, the member through hole formed in the anode member, the member through hole formed in the cathode member, and the member through hole formed in the front separator member are substantially formed by winding the anode member, the cathode member, and the separator member. The cylindrical capacitor elements are arranged at substantially the same position in the circumferential direction.

  Preferably, the member through-hole formed in the anode member, the member through-hole formed in the cathode member, and the member through-hole formed in the separator member are substantially cylinders formed by winding the anode member, the cathode member, and the separator member. In the capacitor element having a shape, a hole having an arbitrary length arranged in a direction from the outer peripheral surface of the capacitor element toward the inside of the capacitor element is formed.

  Preferably, the hole having an arbitrary length is arranged along the radial direction of the capacitor element.

  Preferably, the hole having an arbitrary length is an element through hole penetrating the capacitor element.

  Preferably, the hole having an arbitrary length includes a plurality of element through holes each penetrating the capacitor element.

  Preferably, the plurality of element through holes are arranged at different positions in the circumferential direction of the capacitor element.

  Preferably, the plurality of element through holes are arranged at substantially the same distance from the end of the capacitor element in the length direction of the capacitor element.

  Preferably, the plurality of element through holes are arranged at different positions in the length direction of the capacitor element.

  Preferably, each of the plurality of element through holes penetrates the capacitor element through the central axis of the capacitor element.

  Preferably, the electrolyte is made of a solid electrolyte.

  Preferably, the solid electrolyte is a conductive polymer composed of any of polythiophene, polypyrrole, and polyaniline, or 7,7,8,8-tetracyanoquinodimethane complex salt.

  Preferably, the electrolyte is an electrolytic solution composed of an aqueous solution or an organic solvent.

  Further, according to the present invention, a method for manufacturing an electrolytic capacitor is a method for manufacturing a wound electrolytic capacitor including an electrolyte, the anode member having the dielectric film formed on the surface thereof, the cathode member, and the separator A first step of forming a member through hole in at least one of the members; and after the first step, the separator member is disposed between the anode member and the cathode electrode, and the anode member, the cathode member, and the separator member are wound. A second step of turning to form a substantially cylindrical capacitor element; and a third step of impregnating the capacitor element with an electrolyte.

  Preferably, in the first step, the member through hole is formed in the anode member, the cathode member, and the separator member.

  Preferably, in the first step, the member through-hole forms an element through-hole that penetrates the capacitor element from the radial direction when the anode member, the cathode member, and the separator member are wound. And a separator member.

  In this invention, since the member through hole is formed in at least one of the anode member, the cathode member, and the separator member, the anode member, the cathode member, and the separator member are formed by winding in the electrolytic capacitor manufacturing process. The electrolyte solution permeates from the end face of the substantially cylindrical capacitor element and the member through hole, and the electrolyte is impregnated into the capacitor element.

  Therefore, according to the present invention, the electrolyte solution can be more easily immersed in the capacitor element than when the member through hole is not provided. As a result, the ratio of the electrolyte covering the front and back surfaces of the anode member and the cathode member can be increased, the capacity of the electrolytic capacitor can be increased, and the equivalent series resistance can be reduced.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
1 is a perspective view showing a configuration of an electrolytic capacitor according to Embodiment 1 of the present invention. FIG. 2 is a sectional view showing the structure of the electrolytic capacitor according to Embodiment 1 of the present invention. Referring to FIGS. 1 and 2, electrolytic capacitor 10 according to Embodiment 1 of the present invention includes anodized foil 1, cathode foil 2, separator paper 3, winding tape 4, element through hole 6, and the like. , Lead tab terminals 7, 8, anode lead wire 9, cathode lead wire 11, case 12, rubber packing 13, and seat plate 14.

  The electrolytic capacitor 10 is an electrolytic capacitor including a solid electrolyte, for example.

  The anodized foil 1 is made of an aluminum foil whose surface is subjected to chemical conversion treatment. Therefore, the anodized foil 1 has an uneven surface and an oxide film on the uneven surface. The cathode foil 2 is made of an aluminum foil. The separator paper 3 includes two separator papers 3a and 3b.

  Each of the anodized foil 1, the cathode foil 2 and the separator papers 3a and 3b is formed with a member through-hole which will be described later.

  Separator paper 3a, anodized foil 1, separator paper 3b, and cathode foil 2 are sequentially laminated, and the laminated separator paper 3a, anodized foil 1, separator paper 3b, and cathode foil 2 are wound. Then, the ends of the wound separator paper 3 a, anodized foil 1, separator paper 3 b, and cathode foil 2 are stopped by a winding tape 4. As a result, a substantially cylindrical capacitor element 5 is formed, and an element through hole 6 that penetrates the formed capacitor element 5 in the radial direction is formed.

  The lead tab terminal 7 is connected to the anodized foil 1, and the lead tab terminal 8 is connected to the cathode foil 2. The anode lead wire 9 is connected to the lead tab terminal 7, and the cathode lead wire 11 is connected to the lead tab terminal 8.

  The case 12 is made of aluminum and houses the capacitor element 5, the lead tab terminals 7 and 8, the anode lead wire 9 and the cathode lead wire 11. The rubber packing 13 seals the capacitor element 5 and the lead tab terminals 7 and 8 in the case 12. The seat plate 14 fixes the anode lead wire 9 and the cathode lead wire 11. The anode lead wire 9 and the cathode lead wire 11 are bent along the seat plate 14 when the capacitor element 5 is accommodated in the case 12.

  FIG. 3 is a plan view of the electrolytic capacitor 10 viewed from the direction A shown in FIG. Referring to FIG. 3, the seat plate 14 has a substantially rectangular planar shape, and has notches 14 </ b> A and 14 </ b> B. Then, the anode lead wire 9 and the cathode lead wire 11 are bent in the in-plane direction of the seat plate 14 so as to fit into the notches 14A and 14B of the seat plate 14, respectively.

  The bent anode lead wire 9 and cathode lead wire 11 are used as terminals of the electrolytic capacitor 10.

  FIG. 4 is a diagram for explaining the element through hole 6 shown in FIG. 1 in detail. 4A is a perspective view of the capacitor element 5, and FIG. 4B is a plan view of the capacitor element 5 viewed from the direction A shown in FIG. 4A. FIG. 4C is a plan view of the capacitor element 5 viewed from the B direction shown in FIG.

  Referring to FIG. 4, capacitor element 5 has, for example, a diameter R of 15 mmφ and a length W of 8.0 mm. The element through hole 6 is formed at the positions of W1 = W / 2 = 4.0 mm from both ends 5A and 5B of the capacitor element 5 and R1 = R / 2 = 7.5 mm from the outer peripheral surface 5C of the capacitor element 5, The capacitor element 5 passes through the central axis AX of the substantially cylindrical capacitor element 5 in the radial direction. In this case, the diameter r of the element through hole 6 is 0.7 mm, for example.

  FIG. 5 is a plan view of the anodized foil 1 shown in FIG. Referring to FIG. 5, anodized foil 1 has a strip-like planar shape and has a length L and a width W. 5 becomes the length W of the capacitor element 5 as shown in FIG. 4 when the anodized foil 1 is wound.

  Each of the member through holes 1-1, 1-2,..., 1-n is formed at substantially the center of the anodized foil 1 in the width direction. The member through hole 1-1 is formed at a position of a distance D1 from one end 1A of the anodized foil 1, and the member through hole 1-2 is formed at a position of a distance D2 from the member through hole 1-1. The member through hole 1-3 is formed at a distance D3 from the member through hole 1-2. Similarly, the member through hole 1-n is positioned at a distance Dn from the member through hole 1-n-1. Formed.

  The distances D1 to Dn are such that when the anodized foil 1 is wound together with the cathode foil 2 and the separator papers 3a and 3b, the member through holes 1-1, 1-2,. 5 is a distance arranged at substantially the same position in the circumferential direction. That is, the distances D1 to Dn are distances at which the element through holes 6 are formed along the radial direction of the capacitor element 5 when the anodized foil 1 is wound together with the cathode foil 2 and the separator papers 3a and 3b.

  Each of the cathode foil 2 and the separator papers 3a and 3b shown in FIG. 1 has the same planar shape as the anodized foil 1 shown in FIG. 5 and has member through holes 1-1, 1-2,. The same member through hole as -n is formed.

  6 to 9 are process diagrams of FIGS. 1 to 4 for explaining a method of manufacturing the electrolytic capacitor 10 shown in FIG.

  Referring to FIG. 6, one piece of aluminum foil having predetermined dimensions (length L and width W) is cut, and the surface of the aluminum foil is subjected to an etching treatment, and then a chemical conversion treatment is performed to produce one piece of anodized sheet. The foil 1 is produced. Then, member through holes 1-1, 1-2,..., 1-n are formed in the anodized foil 1 using a needle having a diameter of 0.7 mmφ.

  Then, one piece of aluminum foil having predetermined dimensions (length L and width W) is cut to produce one piece of cathode foil 2, and the member through hole 2-1 is used with a needle having a diameter of 0.7 mmφ. , 2-2, 2-3,..., 2-n are formed on the cathode foil 2. Further, two separator papers having predetermined dimensions are cut to produce separator papers 3a and 3b, and member through holes 3a-1, 3a-2, 3a-3, ..., 3a-n is formed on the separator paper 3a, and the member through holes 3b-1, 3b-2, 3b-3, ..., 3b-n are formed using a needle having a diameter of 0.7 mmφ. It forms on the separator paper 3b.

  Thereafter, the anode lead wire 9 is connected to the lead tab terminal 7, and the cathode lead wire 11 is connected to the lead tab terminal 8. The lead tab terminal 7 is connected to the central portion of the anodized foil 1, and the lead tab terminal 8 is connected to the central portion of the cathode foil 2. In FIG. 6, the anode lead wire 9 and the cathode lead wire 11 are omitted.

  Then, the anodized foil 1, the cathode foil 2 and the two separator papers 3a and 3b are arranged in the manner shown in FIG. 7, and the anodized foil 1, the cathode foil 2 and the separator papers 3a and 3b around the fulcrum FLC are arranged. The anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b are wound up by rotating clockwise (or counterclockwise). Thereby, the capacitor element 5 is manufactured, and the element through hole 6 is formed in the capacitor element 5 (see FIG. 8).

  Subsequently, cut formation and heat treatment at 280 ° C. are performed on the capacitor element 5 to which the lead tab terminals 7 and 8, the anode lead wire 9 and the cathode lead 11 are connected, and the capacitor element 5 is mixed as shown in FIG. Immerse in the liquid 20. This mixed solution 20 is a mixed solution of a monomer that becomes a conductive polymer by polymerization and a p-toluenesulfonic acid ferric alcohol solution as an oxidant solution. By immersing the capacitor element 5 in the mixed solution 20, the mixed solution 20 passes through the end face of the capacitor element 5 and the element through-hole 6 to form the anodized foil 1 of the capacitor element 5 and the two separator papers 3 a and 3 b. It penetrates between the cathode foil 2 and the two separator papers 3a and 3b. A conductive polymer layer is formed between both electrodes of the capacitor element 5 by thermochemical polymerization. As a result, the capacitor element 5 contains an electrolyte. This electrolyte is, for example, a solid electrolyte made of a polythiophene-based, polypyrrole-based or polyaniline-based conductive polymer or a 7,7,8,8-tetracyanoquinodimethane (TCNQ) complex salt. When the electrolyte is impregnated in the capacitor element 5, the rubber packing 13 is inserted into the capacitor element 5, and the capacitor element 5 with the rubber packing 13 inserted is housed and fixed in the case 12.

  Subsequently, the opening of the case 12 is subjected to lateral drawing and curling to seal the rubber packing 13 and the capacitor element 5 and perform an aging process. Thereafter, the seat plate 14 is inserted into the curled surface of the capacitor element 5, and the anode lead wire 9 and the cathode lead wire 11 are pressed and bent as electrode terminals. Thereby, the electrolytic capacitor 10 is completed.

  FIG. 10 is a cross-sectional view of the anodized foil 1. Referring to FIG. 10, when capacitor element 5 is immersed in mixed solution 20, electrolyte 51 is formed on the front and back surfaces of anodized foil 1 through member through holes 1-1 to 1-n. Therefore, the member through holes 1-1 to 1-n in the present invention are through holes in which the electrolyte 51 can be formed on the front and back surfaces of the anodized foil 1. The electrolyte 51 is formed on the front and back surfaces of the cathode foil 2 through the member through holes 2-1 to 2-n. Therefore, the member through holes 2-1 to 2-n are through holes in which the electrolyte 51 can be formed on the front and back surfaces of the cathode foil 2.

  FIG. 11 is a perspective view having a fracture surface of the capacitor element 5. Referring to FIG. 11, when anodized foil 1, cathode foil 2, and separator papers 3a and 3b are wound by the above-described method, capacitor element 5 having a substantially cylindrical shape is produced, and element through hole 6 is formed as a capacitor element. 5 is formed along the radial direction. Then, when the capacitor element 5 is immersed in the mixed solution 20, the mixed solution 20 is formed between the anodized foil 1 and the separator papers 3 a and 3 b and the cathode foil 2 from the end faces 5 D and 5 E of the capacitor element 5 as indicated by arrows 15. It soaks between the separator papers 3a and 3b, and passes through the element through-hole 6 between the anodized foil 1 and the separator papers 3a and 3b and between the cathode foil 2 and the separator papers 3a and 3b, as indicated by arrows 16. Soak in between. Then, since the element through hole 6 is formed so as to pass through the capacitor element 5 through the central axis of the capacitor element 5, the mixed solution 20 is also anodized from the approximate center in the length direction of the capacitor element 5. It penetrates between the foil 1 and the separator papers 3a and 3b and between the cathode foil 2 and the separator papers 3a and 3b.

  Therefore, according to the present invention, the mixed solution 20 (= electrolyte solution) can be more easily immersed in the capacitor element 5 than when the element through hole 6 is not provided. As a result, the ratio of the electrolyte covering the front and back surfaces of the anodized foil 1 and the cathode foil 2 can be increased, the capacity of the electrolytic capacitor can be increased, and the equivalent series resistance can be decreased.

  FIG. 12 is another perspective view of the capacitor element 5 having a fracture surface. Referring to FIG. 12, electrolytic capacitor 10 includes member through holes 1-1, 1-2,..., 1-n formed in anodized foil 1, cathode foil 2, and separator papers 3a and 3b, respectively. , 2-n; 3a-1, 3a-2, ..., 3a-n; 3b-1, 3b-2, ..., 3b-n are capacitor elements 5 may be provided with element through-holes 6A formed so as to be shifted in the length direction and the circumferential direction.

  The element through hole 6A has a diameter of 0.7 mmφ. The element through hole 6 </ b> A does not have a peripheral edge aligned with the radial direction of the capacitor element 5 like the element through hole 6, but has a space for the mixed liquid 20 to enter the radial direction of the capacitor element 5. That is, the periphery of the element through hole 6A is uneven in the radial direction of the capacitor element 5, but has a space through which the mixed liquid 20 passes through the capacitor element 5 in the radial direction.

  Therefore, when the capacitor element 5 having the element through-hole 6A is immersed in the mixed solution 20, the mixed solution 20 passes through the element through-hole 6A, between the anodized foil 1 and the separator papers 3a and 3b, and between the cathode foil 2 and the separator. Immerse into the paper 3a, 3b. As a result, the same effect as when the element through hole 6 is provided in the capacitor element 5 can be obtained.

  In the first embodiment, the element through holes 6 and 6A do not need to pass through the central axis AX of the capacitor element 5 and are shifted in the vertical direction from the center of the capacitor element 5 in the length direction of the capacitor element 5. It may be formed at a position.

[Embodiment 2]
FIG. 13 is a perspective view showing the configuration of the electrolytic capacitor according to the second embodiment. Referring to FIG. 13, electrolytic capacitor 10A according to the second embodiment is obtained by replacing element through hole 6 of electrolytic capacitor 10 shown in FIG. 1 with element through holes 61 and 62. The same. The element through holes 61 and 62 are formed so as to be aligned in the circumferential direction of the capacitor element 5 at a substantially middle point in the length direction of the capacitor element 5.

  FIG. 14 is a plan view of the electrolytic capacitor 10A viewed from the direction A shown in FIG. In FIG. 14, the lead tab terminals 7 and 8, the anode lead wire 9, and the cathode lead wire 11 are omitted.

  Referring to FIG. 14, each of element through holes 61 and 62 has a diameter of 0.7 mmφ. Each of the element through holes 61 and 62 passes through the capacitor element 5 through the central axis AX of the capacitor element 5. As a result, the element through holes 61 and 62 intersect at the position of the central axis AX.

  The electrolytic capacitor 10A is manufactured by the manufacturing method shown in FIGS. Then, when the capacitor element 5 is produced by winding the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b, the element through holes 61 and 62 are formed along the radial direction of the capacitor element 5. A plurality of member through holes are formed in each of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b.

  In addition, when the capacitor element 5 in which the element through holes 61 and 62 are formed is immersed in the mixed solution 20, the mixed solution 20 is anodized foil from the element through holes 61 and 62 in addition to the end faces 5D and 5E of the capacitor element 5. 1 and the separator paper 3a, 3b and between the cathode foil 2 and the separator paper 3a, 3b.

  As a result, the mixed liquid 20 is more effective than the case where the element through hole 6 is provided in the capacitor element 5 between the anodized foil 1 and the separator papers 3a and 3b and the cathode foil from substantially the center in the length direction of the capacitor element 5. 2 and the separator papers 3a and 3b are easily immersed.

  Therefore, according to the second embodiment, the mixed liquid 20 (= electrolyte solution) can be more easily immersed in the capacitor element 5 than when the element through hole 6 is provided in the capacitor element 5. As a result, the ratio of the electrolyte covering the front and back surfaces of the anodized foil 1 and the cathode foil 2 can be further increased, the capacity of the electrolytic capacitor can be further increased, and the equivalent series resistance can be further decreased.

  The electrolytic capacitor 10 </ b> A may include two element through holes whose peripheral edges are uneven in the radial direction of the capacitor element 5 instead of the element through holes 61 and 62. Further, the electrolytic capacitor 10 </ b> A may include three or more element through holes that pass through the central axis of the capacitor element 5 in the circumferential direction of the capacitor element 5. Furthermore, in the second embodiment, the element through holes 61 and 62 do not need to pass through the central axis AX of the capacitor element 5, and in the vertical direction from the center of the capacitor element 5 in the length direction of the capacitor element 5. It may be formed at a shifted position. Furthermore, the element through holes 61 and 62 may intersect at a position other than the central axis AX or may not intersect each other.

[Embodiment 3]
FIG. 15 is a perspective view showing the configuration of the electrolytic capacitor according to the third embodiment. Referring to FIG. 15, electrolytic capacitor 10B according to the third embodiment is obtained by replacing element through hole 6 of electrolytic capacitor 10 shown in FIG. 1 with element through holes 63 and 64. The same.

  FIG. 16 is a plan view of the electrolytic capacitor 10B viewed from the A direction shown in FIG. Referring to FIG. 16, each of element through holes 63 and 64 has a diameter of 0.7 mmφ. The element through holes 63 and 64 are arranged vertically in the length direction of the capacitor element 5. More specifically, the element through hole 63 is formed at a position of W2 from one end 5A of the capacitor element 5 and R1 = R / 2 = 7.5 mm from the outer peripheral surface 5C of the capacitor element 5, and is a substantially cylindrical capacitor. The capacitor element 5 passes through the central axis AX of the element 5 in the radial direction. The element through-hole 64 is formed at a position of W2 from the other end 5B of the capacitor element 5 and R1 = R / 2 = 7.5 mm from the outer peripheral surface 5C of the capacitor element 5, and the center of the substantially cylindrical capacitor element 5 The capacitor element 5 is passed through the axis AX in the radial direction.

  The electrolytic capacitor 10B is manufactured by the manufacturing method shown in FIGS. Then, when the capacitor element 5 is produced by winding the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b, the element through holes 63 and 64 are formed along the radial direction of the capacitor element 5. A plurality of member through holes are formed in each of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b.

  When the capacitor element 5 in which the element through holes 63 and 64 are formed is immersed in the mixed solution 20, the mixed solution 20 is anodized foil from the element through holes 63 and 64 in addition to the end faces 5D and 5E of the capacitor element 5. 1 and the separator paper 3a, 3b and between the cathode foil 2 and the separator paper 3a, 3b.

  As a result, the mixed liquid 20 can be formed between the anodized foil 1 and the separator papers 3a and 3b and the cathode from a substantially central portion in the length direction of the capacitor element 5 as compared with the case where the element through hole 6 is provided in the capacitor element 5. It becomes easy to soak between the foil 2 and the separator papers 3a and 3b.

  Therefore, according to the third embodiment, the mixed liquid 20 (= electrolyte solution) can be more easily immersed in the capacitor element 5 than when the element through hole 6 is provided in the capacitor element 5. As a result, the ratio of the electrolyte covering the front and back surfaces of the anodized foil 1 and the cathode foil 2 can be further increased, the capacity of the electrolytic capacitor can be further increased, and the equivalent series resistance can be further decreased.

  The electrolytic capacitor 10 </ b> B may include two element through holes whose peripheral edges are uneven in the radial direction of the capacitor element 5 instead of the element through holes 63 and 64. Further, the electrolytic capacitor 10 </ b> B may include three or more element through holes in the length direction of the capacitor element 5, each passing through the central axis of the capacitor element 5. Furthermore, in the third embodiment, the element through holes 63 and 64 do not have to pass through the central axis AX of the capacitor element 5. Furthermore, the element through holes 63 and 64 may cross each other.

  The experimental results of the electrolyte impregnation ratio in the electrolytic capacitors 10, 10A, 10B according to the first to third embodiments will be described. Table 1 shows the experimental results of the electrolyte impregnation in the electrolytic capacitors 10, 10A, 10B.

  In Table 1, a conventional example in which no element through hole is provided is shown as a comparison. The number of element through holes is the number of through holes formed in the outer peripheral surface 5C of the capacitor element 5. Therefore, in the case of electrolytic capacitor 10 (Embodiment 1), the number of element through holes is two, and in the case of electrolytic capacitors 10A and 10B (Embodiments 2 and 3), the number of element through holes is four. is there. Furthermore, ten electrolytic capacitors 10, 10A, 10B were each prototyped. Further, the defect rate was measured with an element in which the unimpregnated portion of the electrolyte occupied 10% or more of the cross section of the capacitor element 5 as a defect. Furthermore, the impregnation time is from the time when the capacitor element 5 is immersed in the mixed solution 20 until the mixed solution 20 oozes to the element lead wire side of the capacitor element 5 (when the mixed solution 20 is impregnated into the capacitor element 5, the capacitor element 5 Time of 5).

  From the results shown in Table 1, when the two element through holes 61 and 62 are provided in the circumferential direction of the capacitor element 5, the impregnation time is the shortest, and the number of defects and the defect rate are “0”. Then, when the two element through holes 63 and 64 are provided in the length direction of the capacitor element 5, the impregnation time is short and the number of defects is next to the case where the element through holes 61 and 62 are provided in the capacitor element 5. “1” and the defect rate is 10%. Further, when the element through hole 6 is provided in the capacitor element 5, the number of defects and the defect rate are the same as in the conventional example in which no element through hole is provided, but the impregnation time is shortened. Therefore, by providing the element through hole 6, the impregnation time can be shortened and the productivity of the electrolytic capacitor 10 can be improved.

  As described above, by forming the element through holes 6; 61, 62; 63, 64 in the capacitor element 5, the defective rate of the electrolytic capacitor is reduced, and stable production becomes possible.

[Embodiment 4]
FIG. 17 is a perspective view showing a configuration of an electrolytic capacitor according to the fourth embodiment. Referring to FIG. 17, electrolytic capacitor 10C according to the fourth embodiment is the same as electrolytic capacitor 10 except that element through hole 6 of electrolytic capacitor 10 shown in FIG.

  18 is a plan view of the electrolytic capacitor 10C as viewed from the direction A shown in FIG. Referring to FIG. 18, the hole 65 has a diameter of 0.7 mmφ. The hole 65 is formed inside the capacitor element 5 through the central axis AX of the capacitor element 5. That is, the hole 65 is formed along the radial direction of the capacitor element 5 so as to have a length shorter than the diameter R of the capacitor element 5 inside the outer peripheral surface 5C without reaching the outer peripheral surface 5C of the capacitor element 5. The

  FIG. 19 is a plan view of the electrolytic capacitor 10 </ b> C viewed from the B direction shown in FIG. 17. Referring to FIG. 19, holes 65 are located at the positions of W1 = W / 2 = 4.0 mm from both ends 5A and 5B of capacitor element 5 and R1 = R / 2 = 7.5 mm from outer peripheral surface 5C of capacitor element 5. It is formed.

  The electrolytic capacitor 10C is manufactured by the manufacturing method shown in FIGS. Then, when the capacitor element 5 is produced by winding the anodized foil 1, the cathode foil 2 and the separator papers 3 a and 3 b, the holes 65 are formed along the radial direction of the capacitor element 5 inside the capacitor element 5. In addition, a plurality of member through holes are formed in each of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b.

  When the capacitor element 5 in which the holes 65 are formed is immersed in the mixed solution 20, the mixed solution 20 passes from the end surfaces 5 </ b> D and 5 </ b> E of the capacitor element 5 between the anodized foil 1 and the separator papers 3 a and 3 b and the cathode foil 2. Between the anodized foil 1 and the separator papers 3a and 3b and through the hole 65, and between the cathode foil 2 and the separator papers 3a and 3b. Soak in between.

  As a result, the mixed liquid 20 can be formed between the anodized foil 1 and the separator papers 3a and 3b from the substantially central portion in the length direction of the capacitor element 5 and the cathode as compared with the case where the element through hole 6 is not provided in the capacitor element 5. It becomes easy to soak between the foil 2 and the separator papers 3a and 3b.

  Therefore, according to the fourth embodiment, the mixed liquid 20 (= electrolyte solution) can be more easily immersed in the capacitor element 5 than when the element through hole 6 is not provided in the capacitor element 5. As a result, the ratio of the electrolyte covering the front and back surfaces of the anodized foil 1 and the cathode foil 2 can be increased, the capacity of the electrolytic capacitor can be increased, and the equivalent series resistance can be decreased.

  The electrolytic capacitor 10 </ b> C may include a hole whose peripheral edge is uneven in the radial direction of the capacitor element 5 instead of the hole 65. Further, the electrolytic capacitor 10 </ b> C may include two or more holes that pass through the central axis of the capacitor element 5 in the length direction or the circumferential direction of the capacitor element 5. Furthermore, in the fourth embodiment, the hole 65 does not have to pass through the central axis AX of the capacitor element 5, and is a position shifted in the vertical direction from the center of the capacitor element 5 in the length direction of the capacitor element 5. It may be formed. Furthermore, the hole 65 may have an arbitrary length.

[Embodiment 5]
FIG. 20 is a perspective view showing a configuration of the electrolytic capacitor according to the fifth embodiment. Referring to FIG. 20, electrolytic capacitor 10D according to the fifth embodiment is the same as electrolytic capacitor 10 except that element through hole 6 of electrolytic capacitor 10 shown in FIG.

  FIG. 21 is a diagram for explaining the hole 66 shown in FIG. 20 in detail. 21 (a) is a perspective view of the capacitor element 5, and FIG. 21 (b) is a plan view of the capacitor element 5 viewed from the direction A shown in FIG. 21 (a). FIG. 21C is a plan view of the capacitor element 5 viewed from the B direction shown in FIG.

  Referring to FIG. 21, the hole 66 has a diameter r of 0.7 mmφ. The hole 66 is located at the center of the capacitor element 5 at positions W1 = W / 2 = 4.0 mm from both ends 5A, 5B of the capacitor element 5 and R1 = R / 2 = 7.5 mm from the outer peripheral surface 5C of the capacitor element 5. It is formed in the radial direction through the axis AX (see FIG. 21B).

  One end 66A of the hole 66 is located on the outer peripheral surface 5C of the capacitor element 5, and the other end 66B exists inside the outer peripheral surface 5C. Therefore, the hole 66 has a length L1 that is longer than the radius R1 of the capacitor element 5 and shorter than the diameter R of the capacitor element 5.

  The electrolytic capacitor 10D is manufactured by the manufacturing method shown in FIGS. Then, when the capacitor element 5 is produced by winding the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b, the holes 66 are formed from the outer peripheral surface 5C of the capacitor element 5 along the radial direction. A plurality of member through holes are formed in each of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b.

  When the capacitor element 5 in which the hole 66 is formed is immersed in the mixed solution 20, the mixed solution 20 is added to the anodized foil 1 and the separator papers 3a and 3b from the hole 66 in addition to the end faces 5D and 5E of the capacitor element 5. And between the cathode foil 2 and the separator papers 3a and 3b.

  As a result, the mixed liquid 20 has a gap between the anodized foil 1 and the separator papers 3a and 3b and the cathode foil 2 from a substantially central portion in the length direction of the capacitor element 5 as compared with the case where the hole 66 is not provided in the capacitor element 5. And the separator papers 3a and 3b.

  Therefore, according to the fifth embodiment, the mixed liquid 20 (= electrolyte solution) can be more easily immersed into the capacitor element 5 than when the hole 66 is not provided in the capacitor element 5. As a result, the ratio of the electrolyte covering the front and back surfaces of the anodized foil 1 and the cathode foil 2 can be increased, the capacity of the electrolytic capacitor can be increased, and the equivalent series resistance can be decreased.

  The electrolytic capacitor 10 </ b> D may include a hole whose peripheral edge is uneven in the radial direction of the capacitor element 5 instead of the hole 66. Further, the electrolytic capacitor 10 </ b> D may include two or more holes that pass through the central axis of the capacitor element 5 in the length direction or the circumferential direction of the capacitor element 5. Furthermore, in the fifth embodiment, the hole 66 does not have to pass through the central axis AX of the capacitor element 5, and is a position shifted in the vertical direction from the center of the capacitor element 5 in the length direction of the capacitor element 5. It may be formed. Furthermore, the hole 66 is not limited to the length L1, and may have any length other than the length L1.

[Embodiment 6]
FIG. 22 is a perspective view showing the configuration of the electrolytic capacitor according to the sixth embodiment. Referring to FIG. 22, electrolytic capacitor 10E according to the sixth embodiment is the same as electrolytic capacitor 10 except that element through hole 6 of electrolytic capacitor 10 shown in FIG. The hole 67 is formed inside the capacitor element 5.

  FIG. 23 is a plan view of the electrolytic capacitor 10E viewed from the direction A shown in FIG. With reference to FIG. 23, the hole 67 includes a plurality of member through holes 671 to 692 formed in the anodized foil 1.

  Each of the member through holes 671 to 692 is a hole that penetrates the anodized foil 1 in the film thickness direction. The member through holes 671 to 692 have the same or different diameters in the range of 0.5 mmφ to 1.0 mmφ. Further, the member through holes 671 to 692 are arranged at arbitrary intervals in the circumferential direction and the radial direction of the capacitor element 5. Further, the member through holes 671 to 692 are arranged at arbitrary positions in the length direction of the capacitor element 5.

  The electrolytic capacitor 10E is manufactured by the manufacturing method shown in FIGS. The member through holes 671 to 692 are formed so that the hole 67 is formed inside the capacitor element 5 when the anodized foil 1, the cathode foil 2 and the separator papers 3 a and 3 b are wound to produce the capacitor element 5. It is formed on the anodized foil 1.

  Further, when the capacitor element 5 in which the hole 67 is formed is dipped in the mixed solution 20, the mixed solution 20 passes from the end faces 5D and 5E of the capacitor element 5 between the anodized foil 1 and the separator papers 3a and 3b and the cathode foil 2. And the separator paper 3a and 3b, and reaches the member through holes 671 to 692 constituting the hole 67. Then, the mixed solution 20 penetrates the separator paper 3a or 3b adjacent to the anodized foil 1 through the member through holes 671 to 692, and further reaches the cathode foil 2 adjacent to the separator paper 3a or 3b.

  As a result, the mixed solution 20 is soaked between the anodized foil 1 and the separator papers 3a and 3b and between the cathode foil 2 and the separator papers 3a and 3b, compared to the case where the hole 67 is not provided in the capacitor element 5. It becomes easy to put.

  Therefore, according to the sixth embodiment, the mixed liquid 20 (= electrolyte solution) can be more easily immersed in the capacitor element 5 than when the hole 67 is not provided in the capacitor element 5. As a result, the ratio of the electrolyte covering the front and back surfaces of the anodized foil 1 and the cathode foil 2 can be increased, the capacity of the electrolytic capacitor can be increased, and the equivalent series resistance can be decreased.

  In the sixth embodiment, the number of member through holes formed in the anodized foil 1 is arbitrary.

  In Embodiment 6, a member through hole may be formed in any of the cathode foil 2 and the separator papers 3a and 3b, and at least 2 of the anodized foil 1, the cathode foil 2 and the separator papers 3a and 3b. The member through hole may be formed in one, and generally the member through hole only needs to be formed in at least one of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b. The number, position, diameter, and interval of the member through holes formed in at least one of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b are arbitrary.

  As described above, in the present invention, the member through hole is formed in at least one of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b. 1. A process of forming a member through hole in at least one of the cathode foil 2 and the separator papers 3a and 3b, and the separator papers 3a and 3b are disposed between the anodized foil 1 and the cathode foil 2 to form an anodized foil. 1, the cathode foil 2 and the separator papers 3a and 3b may be wound to form a substantially cylindrical capacitor element 5 and a process C to impregnate the capacitor element 5 with the electrolyte 51. And in the process A, Preferably, a member through-hole is formed in all of the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b. In the process A, more preferably, the member through hole is an element through hole 6 that penetrates the capacitor element 5 from the radial direction when the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b are wound. , 61 to 64 are formed on the anodized foil 1, the cathode foil 2, and the separator papers 3a and 3b.

  Further, each of the holes 65 and 66 constitutes “a hole having an arbitrary length”.

  Further, in the above-described first to sixth embodiments, the electrolytic capacitors 10, 10A, 10B, 10C, 10D, and 10E have been described as including a solid electrolyte. However, in the present invention, the present invention is not limited thereto. The electrolytic capacitor 10 may contain a liquid electrolyte. That is, the electrolytic capacitors 10, 10A, 10B, 10C, 10D, and 10E only need to include an electrolyte made of either a solid electrolyte or a liquid electrolyte. The liquid electrolyte is composed of an aqueous solution or an organic solvent.

  Furthermore, in Embodiment 1 to Embodiment 6 described above, it has been described that the anodized foil 1 and the cathode foil 2 are made of an aluminum foil. However, the present invention is not limited to this, and the anodized foil 1 and the cathode are not limited thereto. The foil 2 may be a valve metal oxide vapor-deposited foil, a single metal nitride vapor-deposited foil, a composite metal nitride vapor-deposited foil, a carbon foil or the like produced using a valve metal such as tantalum and niobium.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to an electrolytic capacitor in which an electrolyte solution can easily penetrate. In addition, the present invention is applied to a method for manufacturing an electrolytic capacitor in which an electrolyte solution can easily penetrate.

It is a perspective view which shows the structure of the electrolytic capacitor by Embodiment 1 of this invention. It is sectional drawing which shows the structure of the electrolytic capacitor by Embodiment 1 of this invention. It is a top view of the electrolytic capacitor seen from the A direction shown in FIG. It is a figure for demonstrating in detail the element through-hole shown in FIG. It is a top view of the anodized foil shown in FIG. FIG. 3 is a first process diagram for explaining a method of manufacturing the electrolytic capacitor shown in FIG. 1. FIG. 6 is a second process diagram for explaining the manufacturing method for the electrolytic capacitor shown in FIG. 1. FIG. 6 is a third process diagram for explaining the method for manufacturing the electrolytic capacitor shown in FIG. 1. FIG. 6 is a fourth process diagram for explaining the manufacturing method for the electrolytic capacitor shown in FIG. 1. It is sectional drawing of anodized foil. It is a perspective view which has a torn surface of a capacitor | condenser element. It is another perspective view of the capacitor element which has a fracture surface. 6 is a perspective view showing a configuration of an electrolytic capacitor according to Embodiment 2. FIG. It is a top view of the electrolytic capacitor seen from the A direction shown in FIG. 6 is a perspective view showing a configuration of an electrolytic capacitor according to Embodiment 3. FIG. It is a top view of the electrolytic capacitor seen from the A direction shown in FIG. 6 is a perspective view showing a configuration of an electrolytic capacitor according to Embodiment 4. FIG. It is the top view of the electrolytic capacitor seen from the A direction shown in FIG. It is the top view of the electrolytic capacitor seen from the B direction shown in FIG. FIG. 10 is a perspective view showing a configuration of an electrolytic capacitor according to a fifth embodiment. It is a figure for demonstrating in detail the long hole shown in FIG. FIG. 10 is a perspective view showing a configuration of an electrolytic capacitor according to a sixth embodiment. It is a top view of the electrolytic capacitor seen from the A direction shown in FIG.

Explanation of symbols

  1 Anodized foil, 1A, 5A, one end, 2 cathode foil, 3, 3a, 3b separator paper, 4 winding tape, 5 capacitor element, 5B other end, 5C outer peripheral surface, 5D, 5E end surface, 6, 61-64 Element through hole, 7, 8 Lead tab terminal, 9 Anode lead wire, 10, 10A, 10B, 10C, 10D, 10E Electrolytic capacitor, 11 Cathode lead wire, 12 Case, 13 Rubber packing, 14 Seat plate, 14A, 17B Notch , 20 mixed solution, 15, 16 arrow, 51 electrolyte, 65, 66 holes, 1-1 to 1-n, 2-1 to 2-n, 3a-1 to 3a-n, 3b-1 to 3b-n, 671 to 692 Member through holes.

Claims (18)

A wound electrolytic capacitor containing an electrolyte,
A dielectric film formed on the surface and wound anode member;
A cathode member wound together with the anode member;
A separator member disposed between the anode member and the cathode member and wound together with the anode member and the cathode member;
A member through hole formed in at least one member of the anode member, the cathode member and the separator member;
In the anode member in which the member through hole is formed, the electrolyte is formed on the front and back surfaces of the anode member through the member through hole. A wound electrolytic capacitor containing an electrolyte,
A dielectric film formed on the surface and wound anode member;
A cathode member wound together with the anode member;
A separator member disposed between the anode member and the cathode member and wound together with the anode member and the cathode member;
An electrolytic capacitor comprising: a member through hole formed in at least two of the anode member, the cathode member, and the separator member.   The electrolytic capacitor according to claim 1, wherein the member through hole is formed in all of the anode member, the cathode member, and the separator member. The member through hole formed in the anode member, the member through hole formed in the cathode member , and the member through hole formed in the separator member are wound around the anode member, the cathode member, and the separator member. The electrolytic capacitor according to claim 3, wherein the electrolytic capacitor is disposed at substantially the same position in the circumferential direction of the substantially cylindrical capacitor element. The member through hole formed in the anode member, the member through hole formed in the cathode member , and the member through hole formed in the separator member are wound around the anode member, the cathode member, and the separator member. The electrolytic capacitor according to claim 3, wherein a hole having an arbitrary length arranged in a direction from the outer peripheral surface of the capacitor element toward the inside of the capacitor element is formed in the substantially cylindrical capacitor element.   The electrolytic capacitor according to claim 5, wherein the hole having an arbitrary length is arranged along a radial direction of the capacitor element.   The electrolytic capacitor according to claim 6, wherein the hole having an arbitrary length is an element through hole penetrating the capacitor element.   The electrolytic capacitor according to claim 5, wherein the hole having an arbitrary length includes a plurality of element through holes each penetrating the capacitor element.   The electrolytic capacitor according to claim 8, wherein the plurality of element through holes are arranged at different positions in a circumferential direction of the capacitor element.   The electrolytic capacitor according to claim 9, wherein the plurality of element through holes are arranged at substantially the same distance from an end of the capacitor element in a length direction of the capacitor element.   The electrolytic capacitor according to claim 8, wherein the plurality of element through holes are arranged at different positions in a length direction of the capacitor element.   12. The electrolytic capacitor according to claim 9, wherein each of the plurality of element through holes penetrates the capacitor element through a central axis of the capacitor element.   The electrolytic capacitor according to claim 1, wherein the electrolyte is made of a solid electrolyte.   The electrolytic capacitor according to claim 13, wherein the solid electrolyte is a conductive polymer composed of any of polythiophene, polypyrrole, and polyaniline, or 7,7,8,8-tetracyanoquinodimethane complex salt.   The electrolytic capacitor according to any one of claims 1 to 12, wherein the electrolyte is an electrolytic solution made of an aqueous solution or an organic solvent. A manufacturing method for manufacturing a wound electrolytic capacitor containing an electrolyte,
A first step of forming a member through hole in at least one of an anode member, a cathode member, and a separator member having a dielectric film formed on the surface;
After the first step, the separator member is disposed between the anode member and the cathode electrode, and the anode member, the cathode member, and the separator member are wound to form a substantially cylindrical capacitor element. A second step;
And a third step of impregnating the capacitor element with the electrolyte.   The method for manufacturing an electrolytic capacitor according to claim 16, wherein, in the first step, the member through hole is formed in the anode member, the cathode member, and the separator member.   In the first step, the member through hole is formed so as to form an element through hole that penetrates the capacitor element from a radial direction when the anode member, the cathode member, and the separator member are wound. The method for producing an electrolytic capacitor according to claim 17, wherein the electrolytic capacitor is formed on a member, the cathode member, and the separator member.

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