JP2010251435A - Solid-state electrolytic capacitor and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce equivalent series resistance (ESR) and equivalent series inductance (ESL) as much as possible in a foil winding type solid electrolytic capacitor. <P>SOLUTION: The solid electrolytic capacitor is made by forming a solid electrolyte containing conductive polymer on a capacitor element that is wound with an anode electrode foil 11 with an oxide film and a cathode electrode foil 12 with a separator 13 in between. The end 11a of the anode electrode foil 11 is protruded by a specified width from one end 13a side of the separator 13, and an anode electrode lead is formed on one end face side of the capacitor element. The end 12b of the cathode electrode foil 12 is protruded by a specified width from the other end 13b side of the separator 13, and a cathode electrode lead is formed on the other end face side of the capacitor element. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solid electrolytic capacitor having a solid electrolyte made of a conductive polymer and a method for manufacturing the same, and more specifically, to reduce the ESR (equivalent series resistance) and the ESL (equivalent series inductance) of the solid electrolytic capacitor. It relates to measuring technology.

  A solid electrolytic capacitor using a solid electrolyte as an electrolyte has few problems such as electrolyte leakage and transpiration that easily occur in, for example, an aluminum electrolytic capacitor using a liquid electrolyte (electrolytic solution), and is small but relatively large in static electricity. In recent years, it has become widespread rapidly due to the fact that electric capacity can be obtained and low ESR can be easily achieved.

  Solid electrolytic capacitors include a sintered pellet type obtained by sintering a powder of valve action metal such as tantalum or aluminum, a foil winding type using a valve action metal foil, and a foil laminated type.

  In the foil wound type and foil laminated type solid electrolytic capacitors, for example, an aluminum foil in which an oxide film as a dielectric is formed on the anode electrode foil is used. When the anode electrode foil is an aluminum foil, an aluminum foil (no oxide film) is used as the cathode electrode foil, as with the anode electrode foil.

  A method for manufacturing a foil-wound solid electrolytic capacitor among them will be described, for example, with respect to the invention described in Patent Document 1. First, an anode electrode foil on which an oxide film is formed and a cathode electrode foil (no oxide film) A tab terminal is attached to each by caulking or welding, and the anode electrode foil and the cathode electrode foil are spirally wound through a separator to form a capacitor element.

  Next, the capacitor element is impregnated with a predetermined monomer (for example, thiophene monomer) and an oxidant and polymerized to form a solid electrolyte made of a conductive polymer. Thereafter, the capacitor element is housed in, for example, a bottomed cylindrical aluminum case, and the case opening is sealed with a sealing member such as a sealing rubber.

  The foil-wound solid electrolytic capacitor is generally manufactured as described above, but in the same manner as a normal aluminum electrolytic capacitor, a tab terminal is attached to each of the anode electrode foil and the cathode electrode foil, and accumulation or discharge is performed. Since electric charges are concentrated on the connection portion of the tab terminal, the equivalent series resistance (ESR) of the connection portion inevitably increases.

  Further, as described above, since there is one tab terminal attached to each electrode foil, each electrode foil has an impedance corresponding to the number of windings between the tab terminals, that is, an equivalent series. Inductance (ESL) is generated. This inductance becomes an unstable factor in circuit design when a solid electrolytic capacitor is used.

Japanese Patent Laid-Open No. 2001-176553 (see particularly FIG. 1)

  Accordingly, an object of the present invention is to reduce the equivalent series resistance (ESR) and the equivalent series inductance (ESL) as much as possible in a foil-wound solid electrolytic capacitor.

  In order to solve the above problems, a solid electrolytic capacitor of the present invention has an anode electrode foil on which an oxide film is formed and a capacitor element in which a cathode electrode foil is wound through a separator, and the capacitor element is electrically conductive. In a solid electrolytic capacitor in which a solid electrolyte containing a conductive polymer is formed, an end portion of the anode electrode foil protrudes from one end side of the separator with a predetermined width, and an anode electrode lead portion is provided on one end surface side of the capacitor element. And the end of the cathode electrode foil protrudes from the other end of the separator with a predetermined width, and a cathode electrode lead-out portion is formed on the other end surface of the capacitor element. Yes.

  In the solid electrolytic capacitor of the present invention, the end of the anode electrode foil and the end of the cathode electrode foil may protrude from one end side and the other end side of the separator over the entire circumference of the capacitor element, respectively. preferable.

  The solid electrolytic capacitor of the present invention includes a mode in which electrode terminal portions are attached to the anode electrode lead portion and the cathode electrode lead portion, respectively.

  In the solid electrolytic capacitor of the present invention, the electrode terminal portion is made of a metal plate, and is attached to the anode electrode lead portion and the cathode electrode lead portion by a welding method of laser welding, ultrasonic welding, or cold welding. It's okay.

  As another aspect, the electrode terminal portion may be directly formed on the anode electrode lead portion and the cathode electrode lead portion by metal spraying.

  As yet another aspect, a metal plate as the electrode terminal portion is attached to either the anode electrode lead portion or the cathode electrode lead portion by a welding method of laser welding, ultrasonic welding or cold welding. Alternatively, the electrode terminal portion may be directly formed on the other side by a metal spraying method.

  In the solid electrolytic capacitor of the present invention, it is preferable that the anode electrode foil, the cathode electrode foil, and the electrode terminal portion are all made of the same metal material.

  In the solid electrolytic capacitor of the present invention, as a product form, a lead terminal is connected to each of the electrode terminal portions, the capacitor element is accommodated in a predetermined exterior case, and the leading end side of the lead terminal is pulled out from the exterior case.

  In the solid electrolytic capacitor of the present invention, the outer case is made of a mold resin formed around the capacitor element, and the tip end side of the lead terminal is bent along a plane including the bottom surface of the outer case, and can be surface mounted. It is preferred that

  In the solid electrolytic capacitor of the present invention, the capacitor element is preferably flattened by being crushed from a direction perpendicular to the winding axis.

  Further, the present invention includes a capacitor element in which an anode electrode foil on which an oxide film is formed and a cathode electrode foil are wound via a separator, and the capacitor element includes a solid electrolyte containing a conductive polymer. In the method for producing a solid electrolytic capacitor formed, the anode electrode foil is protruded from one end side of the separator, and the cathode electrode foil end portion protrudes from the other end side of the separator. The electrode foil and the cathode electrode foil are wound in a state of being shifted in opposite directions with respect to the separator, and have an anode electrode lead-out portion made of an end portion of the anode electrode foil on one end surface side, and on the other end surface side. Capacitor element creation step for creating a capacitor element having a cathode electrode lead portion composed of an end of the cathode electrode foil, and the anode electrode foil by immersing the capacitor element in a chemical conversion solution A re-forming step for re-forming the anode electrode foil by supplying power, a solid-electrolyte forming step for forming a solid electrolyte containing a conductive polymer in the capacitor element after the re-forming, and after forming the solid electrolyte, the anode electrode Also included is a method of manufacturing a solid electrolytic capacitor, comprising performing an electrode terminal portion forming step of forming electrode terminal portions on the lead portion and the cathode electrode lead portion, respectively.

  In the capacitor element creation step, the capacitor element is preferably flattened by being crushed from a direction orthogonal to the winding axis.

  In the manufacturing method of the present invention, a tab terminal is attached to the anode electrode foil in the pre-process of the capacitor element creation process, and the anode electrode foil is supplied with power through the tab terminal in the re-forming process. A step of removing the tab terminal from the anode electrode foil may be performed.

  In the production method of the present invention, preferably, before the re-forming step, the foil cut end surface of the anode electrode foil is coated with a coating resin material, and before the electrode terminal portion is formed on the anode electrode lead portion. The process of removing the said coating resin material from the foil cut surface of the said anode electrode foil is implemented.

  It is preferable that the coating resin material is coated on the foil cut end surface of the anode electrode foil in a pre-process of the capacitor element creation process.

  According to a preferred aspect of the production method of the present invention, a heat-vaporizing resin is used for the coating resin material, and the coating resin material is evaporated and removed by heat during the heating process of the solid electrolyte in the solid electrolyte forming step. .

  Further, according to a preferred embodiment of the production method of the present invention, when coating the foil cut end surface of the anode electrode foil with a coating resin material, the foil cut end surface of the cathode electrode foil is also coated with the coating resin material. Also, when removing the coating resin material from the foil cut surface of the anode electrode foil, the coating resin material is removed from the foil cutting end surface of the cathode electrode foil.

  In the electrode terminal portion forming step, a metal plate is used for the electrode terminal portion, and the anode electrode lead portion and the cathode electrode lead portion are welded to the metal plate by any one of laser welding, ultrasonic welding, and cold welding. A mode of welding to the part is included.

  The electrode terminal part forming step includes an aspect in which the electrode terminal part is directly formed on the anode electrode lead part and the cathode electrode lead part by metal spraying.

  In the electrode terminal portion forming step, either one of the anode electrode lead portion and the cathode electrode lead portion, a metal plate as the electrode terminal portion is any one of laser welding, ultrasonic welding, and cold welding. The mode which welds by the welding method of this, and forms the said electrode terminal part directly in the other by the metal spraying method is also contained.

  In the manufacturing method of the present invention, after the electrode terminal portion forming step, a lead terminal is connected to each of the electrode terminal portions to store the capacitor element in a predetermined exterior case, and the leading end side of the lead terminal is connected to the exterior portion. Further included is an exterior case storage step of drawing out from the case.

  In the outer case storing step, the outer case is made of a mold resin formed around the capacitor element, and surface mounting is possible by bending the leading end side of the lead terminal along a plane including the bottom surface of the outer case. It is preferable to do.

  According to the present invention, the anode electrode lead-out portion comprising the protruding portion of the anode electrode foil is formed on one end surface side of the capacitor element, and the cathode electrode comprising the protruding portion of the cathode electrode foil on the other end surface side of the capacitor element. Since the lead portion is formed, the equivalent series resistance (ESR) and the equivalent series inductance (ESL) are greatly reduced by attaching the electrode terminal portion so as to cover the anode electrode lead portion and the cathode electrode lead portion. be able to.

In this invention, (a) A typical perspective view which shows the positional relationship of the anode electrode foil at the time of foil winding, cathode electrode foil, and a separator, (b) The plane expanded view. The typical disassembled perspective view which shows the capacitor | condenser element in this invention, an electrode terminal part, and a lead terminal. Sectional drawing which shows the state which gave the mold resin exterior to the capacitor | condenser element, and was chipped. Process drawing for demonstrating the manufacturing method of this invention.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4, but the present invention is not limited to this.

  As shown in FIGS. 1A and 1B, for example, the cathode electrode foil 12, the separator 13 (first separator 131), the anode electrode foil 11, and the separator 13 (second separator 132) are sequentially stacked and wound in a spiral shape. In this invention, the capacitor element 10 shown in FIG. 2 is obtained by winding the anode electrode foil 11 and the cathode electrode foil 12 in the opposite directions with respect to each separator 13. Create

  In FIG. 1A, the right end portions of the anode electrode foil 11 and the cathode electrode foil 12 are set as one end portions 11a and 12a, and the left end portions are set as the other end portions 11b and 12b. Similarly, the right side is designated as one end 13a and the left side as the other end 13b. In this embodiment, it is assumed that the anode electrode foil 11, the cathode electrode foil 12, and each separator 13 have substantially the same width.

  In winding up each foil, the anode electrode foil 11 is on the right side (FIG. 1 (b) in FIG. 1 (a) with respect to the separator 13 so that one end 11a protrudes from the one end 13a of the separator 13 with a predetermined width. ) In the lower position, place it.

  On the other hand, with respect to the cathode electrode foil 12, the other end portion 12b protrudes from the other end 13b of the separator 13 with a predetermined width on the left side in FIG. 1A (FIG. 1B). In this case, it is shifted to the upper side. The protruding width is preferably the same width for both the anode electrode foil 11 and the cathode electrode foil 12, and may be about 1 mm as an example.

  By winding the foil in this way, as shown in FIG. 2, a spiral anode electrode lead-out portion 10 a made of the end portion 11 a of the anode electrode foil 11 is created on one end surface side of the capacitor element 10. A spiral cathode electrode lead-out portion 10b composed of the end portion 12b of the cathode electrode foil 12 is formed on the end face side.

  As a modified embodiment, the widths of the anode electrode foil 11 and the cathode electrode foil 12 are made larger than the width of the separator 13, for example, the other end portion 11 b of the anode electrode foil 11 is aligned with the other end 13 b of the separator 13. Even if one end 11a protrudes from the separator 13 and one end 12a of the cathode electrode foil 12 is aligned with one end 13a of the separator 13, the other end 12b protrudes from the separator 13. Also good.

  Including the embodiment shown in FIG. 1, the protruding portions of the anode electrode foil 11 and the cathode 12 electrode foil are formed, for example, in a comb shape, and the anode electrode leading portion 10a and the cathode electrode leading portion 10b include discontinuous tongue pieces. It is good also as a form.

  After a solid electrolyte made of a conductive polymer is formed on the capacitor element 10 by a method described later, an electrode terminal portion 20 is provided on each of the anode electrode lead portion 10a and the cathode electrode lead portion 10b.

  In this embodiment, metal plates 21a and 21b are used as the electrode terminal portion 20 for both the anode electrode lead portion 10a and the cathode electrode lead portion 10b. In order to prevent the electric corrosion etc. by a dissimilar metal, it is preferable that the metal plates 21a and 21b are the same kind of metal materials as the electrode foils 11 and 12. For example, if the electrode foils 11 and 12 are aluminum materials, the metal plates 21a and 21b are also aluminum materials.

  According to a preferred aspect of the present invention, the metal plates 21a and 21b are formed in a disc shape covering the entire surfaces of the anode electrode lead portion 10a and the cathode electrode lead portion 10b, and the anode electrode lead portion 10a and the cathode electrode lead portion are welded. 10b. Although welding is preferably laser welding, ultrasonic welding or cold welding may be employed.

  Thereby, the anode-side metal plate 21a and the cathode-side metal plate 21b are wider than the anode electrode lead portion 10a and the cathode electrode lead portion 10b, respectively (which is considerably wider than the contact surface by the conventional tab terminal). Surface).

  Therefore, according to the present invention, the equivalent series resistance (ESR) of the capacitor element 10 can be greatly reduced. Moreover, since the coil component is almost eliminated even though it is a foil wound body, the equivalent series inductance (ESL) can also be significantly reduced.

  In this embodiment, in order to make the capacitor element 10 a surface mountable chip component, the anode lead terminal 22a is connected to the anode side metal plate 21a and the cathode lead terminal 22b is connected to the cathode side metal plate 21b. .

  For the lead terminals 22a and 22b, it is preferable to use, for example, an aluminum wire which is the same kind of metal material as the metal plates 21a and 21b. For the connection, a welding method may be used. The lead terminals 22a and 22b are preferably connected to the metal plates 21a and 21b coaxially.

  After the connection of the lead terminals 22a and 22b, the capacitor element 10 is put in a molding die (not shown), and, for example, a hexahedral prismatic resin outer package 30 is formed around the capacitor element 10 by molding resin as shown in FIG. Form.

  Thereafter, the leading end portions of the lead terminals 22 a and 22 b drawn from the resin sheathing body 30 are bent along a plane including the bottom surface of the resin sheathing body 30. In this embodiment, the leading end portions of the lead terminals 22a and 22b are bent so as to sink into the bottom surface of the resin sheathing body 30, but they may be bent in the opposite direction. Moreover, in order to improve the stability at the time of mounting, it is preferable to flatten the tip portions of the lead terminals 22a and 22b with a press or the like.

  In the above embodiment, the metal plates 21a and 21b are used as the electrode terminal portions 20 of the anode electrode extraction portion 10a and the cathode electrode extraction portion 10b. However, for example, the anode electrode extraction portion 10a and the cathode electrode are formed by metal spraying of aluminum powder. The electrode terminal portion 20 can also be formed directly on the lead portion 10b.

  Further, in the above embodiment, when the capacitor element 10 is made into a chip, the resin outer package 30 is formed with a mold resin. However, the capacitor element 10 is housed in a box-shaped outer case and the chip is formed. The embodiment to be converted is also included in the present invention.

  Further, the capacitor element 10 is crushed from the direction orthogonal to the winding axis to be flattened, whereby the chip component can be reduced in height accordingly.

  Next, an embodiment of the manufacturing method of the present invention will be described with reference to the process diagram shown in FIG.

  In this embodiment, as the anode electrode foil 11, an aluminum foil having a surface roughened by an etching process and then formed with an oxide film as a dielectric by, for example, an anodic oxidation method is used as the cathode electrode foil 12. Uses an aluminum foil whose surface is only roughened by an etching process.

  First, as the first step 40, a coating resin material is coated on the foil cutting end surface (cut surface when cutting out from the mother foil) of the anode electrode foil 11. This is to prevent an oxide film from being formed on the cut end surface of the foil at the time of re-forming the anode electrode foil 11 to be described later, and to prevent a solid electrolyte from being formed on the cut end surface of the foil at the time of forming the solid electrolyte to be described later. Because.

  Similarly, a coating resin material is coated on the foil cut end face of the cathode electrode foil 12 in order to prevent the solid electrolyte from being formed on the foil cut end face when the solid electrolyte is formed. The coating resin material is preferably a heat transpiration type resin that evaporates by heat applied during the formation of the solid electrolyte, for example.

  In the second step 41, as shown in FIG. 1A, the tab terminal 14 used as a power feeding terminal when the anode electrode foil 11 is re-formed is attached to the anode electrode foil 11. The tab terminal 14 has a terminal body that is pressed into one end side of an aluminum round bar wire to form a feather plate, and a CP wire (solder-plated copper) at the end of the round bar wire remaining on the other end side of the terminal body. A tab terminal welded with a coated steel wire may be used.

  In the third step 42, the anode electrode foil 11 and the cathode electrode foil 12 are shifted and wound in the opposite directions with respect to the separator 13 as described above with reference to FIGS. 1 (a) and 1 (b).

  In the fourth step 43, in order to batch process a plurality of capacitor elements 10, a holding lead terminal (not shown) is welded to the tab terminal 14 of each capacitor element 10, and a plurality of capacitor elements are connected via the holding lead terminals. 10 is welded and hung to a hoop material (not shown).

  Then, in the fifth step 44, each capacitor element 10 is immersed in a chemical conversion liquid containing, for example, ammonium adipate as a main component, and is supplied from the hoop material to the anode electrode foil 11 via the holding lead terminal and the tab terminal 14. Then, the anode electrode foil 11 is reformed. Thereby, the defect | deletion location of the oxide film of the anode electrode foil 11 produced at the time of foil winding is repaired.

  In a subsequent sixth step 45, the capacitor element 10 is impregnated with a predetermined monomer (for example, thiophene monomer (3,4-ethylenedioxythiophene)) and an oxidizing agent, and is chemically polymerized to form a solid electrolyte made of a conductive polymer. Form.

  The coating resin material is evaporated by heat applied during the formation of the solid electrolyte and removed from the end face of the foil cut. As a result, the foil cut end surfaces of the anode electrode foil 11 and the cathode electrode foil 12 that are not attached to anything are exposed. The covering resin material may be removed mechanically or chemically.

  In the subsequent seventh step 46, the tab terminal 14 is separated from the anode electrode foil 11. In this case, the tab terminal 14 may be attached to the outermost peripheral side of the anode electrode foil 11 and the outermost peripheral foil may be cut to remove the tab terminal 14 together with the foil.

  Then, the electrode terminal portions 20 are respectively formed on the anode electrode lead portion 10a on one end face side of the capacitor element 10 and the cathode electrode lead portion 10b on the other end face side. For this, any one of the 8a process 47, the 8b process 48, and the 8c process 49 is selected.

  In step 8a 47, as shown in FIG. 2, the anode side metal plate 21a and the cathode side metal plate 21b as the electrode terminal portion 20 are welded to the anode electrode lead portion 10a and the cathode electrode lead portion 10b, respectively. Then, after connecting the anode-side lead terminal 22a and the cathode-side lead terminal 22b to the anode-side metal plate 21a and the cathode-side metal plate 21b, as illustrated in FIG. After forming the exterior body 30 and performing aging for a predetermined time, the lead terminals 22a and 22b are formed.

  In another 8b step 48, after the electrode terminal portion 20 is formed directly on the anode electrode lead portion 10a and the cathode electrode lead portion 10b by, for example, metal spraying method of aluminum powder, After connecting the anode-side lead terminal 22a and the cathode-side lead terminal 22b to the anode-side electrode terminal portion 20 and the cathode-side electrode terminal portion 20, as shown in FIG. After forming the body 30 and aging for a predetermined time, the lead terminals 22a and 22b are formed.

  In yet another 8c step 49, for example, the electrode terminal portion 20 made of the metal plate 21a is connected to the anode electrode lead portion 10a, and the cathode electrode lead portion 10b is directly connected to the cathode electrode lead portion 10b by, for example, metal spraying of aluminum powder. After the electrode terminal portion 20 is formed, the anode-side lead terminal 22a and the cathode-side lead terminal 22b are connected to the anode-side electrode terminal portion 20 and the cathode-side electrode terminal portion 20 in the same manner as in step 8a. After the connection, as illustrated in FIG. 3, the resin sheathing body 30 is formed on the capacitor element 10, and after aging for a predetermined time, the lead terminals 22a and 22b are formed.

  By any of the above-described methods, the equivalent series resistance (ESR) of the capacitor element 10 can be greatly reduced, and since the coil component is substantially eliminated while being a foil wound body, the equivalent series inductance ( ESL) can also be significantly reduced.

DESCRIPTION OF SYMBOLS 10 Capacitor element 10a Anode electrode extraction part 10b Cathode electrode extraction part 11 Anode electrode foil 11a End part 12b of anode electrode foil End part 12 of cathode electrode foil Cathode electrode foil 13 Separator 14 Tab terminal 20 Electrode terminal part 21a, 21b Metal plate 22a , 22b Lead terminal 30 Resin armor (exterior case)

Claims (22)

A solid electrolytic capacitor having a capacitor element in which an anode electrode foil on which an oxide film is formed and a cathode electrode foil are wound via a separator, and a solid electrolyte containing a conductive polymer formed on the capacitor element In
An end portion of the anode electrode foil protrudes from one end side of the separator with a predetermined width, an anode electrode lead portion is formed on one end surface side of the capacitor element, and an end portion of the cathode electrode foil is the separator A solid electrolytic capacitor characterized in that a cathode electrode lead-out portion is formed on the other end surface side of the capacitor element by protruding from the other end side of the capacitor element with a predetermined width.   The end of the anode electrode foil and the end of the cathode electrode foil protrude from one end side and the other end side of the separator, respectively, over the entire circumference of the capacitor element. Solid electrolytic capacitor.   3. The solid electrolytic capacitor according to claim 1, wherein electrode terminal portions are respectively attached to the anode electrode lead portion and the cathode electrode lead portion.   4. The electrode terminal portion is made of a metal plate, and is attached to the anode electrode lead portion and the cathode electrode lead portion by any one of laser welding, ultrasonic welding, and cold welding. The solid electrolytic capacitor described in 1.   4. The solid electrolytic capacitor according to claim 3, wherein the electrode terminal portion is formed directly on the anode electrode lead portion and the cathode electrode lead portion by a metal spraying method.   A metal plate as the electrode terminal portion is attached to one of the anode electrode lead portion and the cathode electrode lead portion by a welding method of laser welding, ultrasonic welding or cold welding, and to the other one The solid electrolytic capacitor according to claim 3, wherein the electrode terminal portion is directly formed by a metal spraying method.   The solid electrolytic capacitor according to any one of claims 3 to 6, wherein the anode electrode foil, the cathode electrode foil, and the electrode terminal portion are all made of the same metal material.   8. A lead terminal is connected to each of the electrode terminal portions, the capacitor element is housed in a predetermined exterior case, and a tip end side of the lead terminal is pulled out from the exterior case. The solid electrolytic capacitor according to item 1.   The outer case is made of a mold resin formed around the capacitor element, and the leading end side of the lead terminal is bent along a plane including the bottom surface of the outer case so that surface mounting is possible. The solid electrolytic capacitor according to claim 8.   10. The solid electrolytic capacitor according to claim 1, wherein the capacitor element is flattened by being crushed from a direction orthogonal to a winding axis. 11. A solid electrolytic capacitor having a capacitor element in which an anode electrode foil on which an oxide film is formed and a cathode electrode foil are wound via a separator, and a solid electrolyte containing a conductive polymer formed on the capacitor element In the manufacturing method of
The anode electrode foil and the cathode electrode foil are placed on the separator so that the end of the anode electrode foil protrudes from one end of the separator and the end of the cathode electrode foil protrudes from the other end of the separator. Winding in a state shifted from each other in the opposite direction, and having an anode electrode lead-out portion made of the end portion of the anode electrode foil on one end surface side, and a cathode electrode lead-out made of the end portion of the cathode electrode foil on the other end surface side A capacitor element creating process for creating a capacitor element having a portion;
A re-forming step of re-forming the anode electrode foil by powering the anode electrode foil by immersing the capacitor element in a chemical conversion solution;
After re-forming, a solid electrolyte forming step for forming a solid electrolyte containing a conductive polymer in the capacitor element;
After forming the solid electrolyte, an electrode terminal part forming step of forming electrode terminal parts on the anode electrode lead part and the cathode electrode lead part, respectively,
A method for producing a solid electrolytic capacitor, comprising:   The method for producing a solid electrolytic capacitor according to claim 10, wherein in the capacitor element creating step, the capacitor element is crushed and flattened from a direction orthogonal to a winding axis.   A tab terminal is attached to the anode electrode foil in the pre-process of the capacitor element creation process, and the anode electrode foil is supplied with power through the tab terminal in the re-forming process. After the re-forming, the tab is removed from the anode electrode foil. The method for producing a solid electrolytic capacitor according to claim 11 or 12, wherein the terminal is removed.   Before the re-forming step, the foil cutting end surface of the anode electrode foil is coated with a coating resin material, and before the electrode terminal portion is formed on the anode electrode lead-out portion, the coating resin material is cut into the foil of the anode electrode foil. It removes from a surface, The manufacturing method of the solid electrolytic capacitor of any one of Claim 11 thru | or 13 characterized by the above-mentioned.   The method for producing a solid electrolytic capacitor according to claim 14, wherein the coating resin material is coated on the foil cut end surface of the anode electrode foil in a pre-process of the capacitor element creation process.   16. A heat evaporation type resin is used for the coating resin material, and the coating resin material is evaporated and removed by heat during the heating step of the solid electrolyte in the solid electrolyte forming step. Manufacturing method for solid electrolytic capacitor.   When coating the foil cutting end surface of the anode electrode foil with a coating resin material, the foil cutting end surface of the cathode electrode foil is also coated with the coating resin material, and the coating resin material is coated with the foil cutting surface of the anode electrode foil. The method for producing a solid electrolytic capacitor according to any one of claims 14 to 16, wherein the coating resin material is removed from a cut end surface of the cathode electrode foil also when removing from the electrode.   In the electrode terminal portion forming step, a metal plate is used for the electrode terminal portion, and the anode electrode lead portion and the cathode electrode lead portion are bonded to the metal plate by any one of laser welding, ultrasonic welding, and cold welding. The method for producing a solid electrolytic capacitor according to claim 11, wherein the solid electrolytic capacitor is welded.   18. The electrode terminal portion forming step, wherein the electrode terminal portion is formed directly on the anode electrode lead portion and the cathode electrode lead portion by a metal spraying method. The manufacturing method of the solid electrolytic capacitor of description.   In the electrode terminal portion forming step, either one of the anode electrode lead portion and the cathode electrode lead portion is welded to a metal plate as the electrode terminal portion by laser welding, ultrasonic welding or cold welding. 18. The method for manufacturing a solid electrolytic capacitor according to claim 11, wherein the electrode terminal portion is directly formed on the other side by a metal spraying method.   After the electrode terminal portion forming step, a lead terminal is connected to each of the electrode terminal portions, the capacitor element is stored in a predetermined outer case, and an outer case storing step of pulling out the leading end side of the lead terminal from the outer case. The method for manufacturing a solid electrolytic capacitor according to claim 11, further comprising:   In the outer case storing step, the outer case is made of a mold resin formed around the capacitor element, and surface mounting is possible by bending the leading end side of the lead terminal along a plane including the bottom surface of the outer case. The method for producing a solid electrolytic capacitor according to claim 21, wherein:

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