JPWO2012049993A1 - Solid electrolytic capacitor and manufacturing method thereof - Google Patents

Abstract

Provided are a solid electrolytic capacitor having a large capacity, a low ESR, and a capacitance that does not decrease due to a chemical conversion treatment performed in the manufacturing process, and a manufacturing method thereof. A solid electrolytic capacitor according to the present invention includes a wound body 11 in which a plurality of anode foils 111 and 111 each having a dielectric film formed on a surface and an end face are wound through a conductive separator 112. A solid electrolyte layer formed inside the wound body 11, a plurality of anode leads connected to the plurality of anode foils 111 and 111 and drawn from the winding end surface 11a of the wound body 11, and a separator 112 And a cathode lead electrically connected.

Description

  The present invention relates to a winding type solid electrolytic capacitor and a method for manufacturing the same.

  Conventionally, in this type of solid electrolytic capacitor, a capacitor element is configured by winding an anode foil and a cathode foil with a non-conductive separator interposed therebetween (see, for example, Patent Document 1).

  For example, in the solid electrolytic capacitor shown in FIG. 11, a wound body (a winding body (801) and a cathode foil (802)) is formed by winding both foils with a separator (803) interposed therebetween. 80), an anode lead (81) electrically connected to the anode foil (801) and drawn from the winding body (80), and a winding body (80) electrically connected to the cathode foil (802). ) And a cathode lead (82) drawn out from.

  Here, a dielectric coating is formed on the surface of the anode foil (801), and the anode foil (801) is produced as follows. First, a metal foil (for example, an aluminum foil) to be an anode foil (801) is prepared, and etching processing is performed on the surface of the metal foil. Next, a chemical film is applied to the surface of the metal foil to form a dielectric film on the surface. Thereafter, the metal foil is cut to cut the metal foil into a long predetermined shape. As a result, an anode foil (801) whose surface is covered with a dielectric coating is produced. A solid electrolyte layer is formed in the gap between the anode foil (801) and the cathode foil (802) by impregnating the gap with an electrolytic polymerization solution and polymerizing the gap.

  The solid electrolytic capacitor can function as a noise filter that removes high-frequency noise generated from a processing device such as a CPU (Central Processing Unit).

  An electrolyte electrolytic capacitor is known in which a conductive separator is interposed between an anode foil and a cathode foil (see Patent Document 2).

JP 2002-83750 A JP-A-2005-347601

  In recent years, with the downsizing of electronic devices, solid electrolytic capacitors are required to have a large capacity despite their small size. In addition, the processing speed of a processing unit such as a CPU is increased, and therefore, the amount of current supplied to the processing unit increases, and the noise band tends to shift to the high frequency side. Accordingly, there is a demand for a low ESR (equivalent series resistance) in a solid electrolytic capacitor.

  However, in order to realize a large capacity in the conventional solid electrolytic capacitor, it is necessary to increase the amount of winding of the anode foil (801) and the cathode foil (802) to increase the facing area thereof. The size of the solid electrolytic capacitor will increase.

  In the process of manufacturing the solid electrolytic capacitor, since the anode foil (801) is manufactured by cutting the metal foil as described above, the surface of the anode foil (801) is exposed at the cut surface (end surface). It will be. Further, the dielectric coating is damaged by the stress generated by the attachment of the anode lead (81) to the anode foil (801) and the winding of the anode foil (801). For this reason, in the process of manufacturing the solid electrolytic capacitor, an oxide film (dielectric film) is formed on the exposed surface of the anode foil (801) by subjecting the wound body (80) to re-chemical conversion. It was necessary to repair the damaged part of the dielectric coating.

  On the other hand, in an electrolytic solution type electrolytic capacitor, the electrolytic solution has high repairability for repairing the dielectric coating when the dielectric coating is damaged. For this reason, in an electrolytic solution type electrolytic capacitor, it is not necessary to carry out a re-chemical conversion treatment in the manufacturing process, and therefore, problems such as corrosion of the cathode foil hardly occur even when a conductive separator is used. Therefore, it has been proposed to use a conductive separator in an electrolytic solution type electrolytic capacitor in order to reduce its ESR (see, for example, Patent Document 2).

  However, since it is necessary to perform a re-forming process in a solid electrolytic capacitor, it has been difficult to apply a conductive separator to a conventional solid electrolytic capacitor. This is because problems such as corrosion of the cathode foil (802) occur with the execution of the re-forming process, which may lead to a decrease in the capacitance of the solid electrolytic capacitor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a solid electrolytic capacitor having a large capacity, a low ESR, and a capacitance that does not decrease due to a chemical conversion process performed in the manufacturing process, and a method for manufacturing the same.

  A solid electrolytic capacitor according to the present invention includes a wound body in which a plurality of anode foils each having a dielectric film formed on a surface and an end surface thereof are wound through a conductive separator, and an inside of the wound body. A solid electrolyte layer formed; a plurality of anode leads connected to the plurality of anode foils and drawn from a winding end surface of the winding body; and a cathode lead electrically connected to the separator. It is.

  The method for manufacturing a solid electrolytic capacitor according to the present invention includes a step of connecting anode leads to a plurality of anode foils having a dielectric film formed on the surface, and winding the plurality of anode foils via a conductive separator. A step of forming a wound body by rotating, a step of immersing the wound body in a chemical conversion liquid, and applying a voltage to the plurality of anode foils to form a dielectric film on an end face of the anode foil; And a step of electrically connecting the cathode lead to the separator, and a step of forming a solid electrolyte layer inside the wound body.

  The solid electrolytic capacitor according to the present invention has a large capacity and a low ESR, and the capacitance is not lowered by a chemical conversion treatment performed in the manufacturing process. Moreover, according to the manufacturing method which concerns on this invention, such a solid electrolytic capacitor can be produced.

FIG. 1 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention. FIG. 2 is a bottom view of the solid electrolytic capacitor. 3 is a cross-sectional view taken along line AA shown in FIG. 4 is a cross-sectional view taken along the line BB shown in FIG. FIG. 5 is a perspective view showing a wound body constituting the solid electrolytic capacitor. FIG. 6 is a diagram used for explaining the re-chemical conversion treatment step in the method for producing the solid electrolytic capacitor. FIG. 7 is a perspective view used for explaining an assembly process in the method for manufacturing the solid electrolytic capacitor. FIG. 8 is a cross-sectional view showing a first modification of the solid electrolytic capacitor. FIG. 9 is a bottom view of the solid electrolytic capacitor shown in FIG. FIG. 10 is a perspective view showing a wound body included in the solid electrolytic capacitor in a second modification of the solid electrolytic capacitor. FIG. 11 is a perspective view showing a conventional solid electrolytic capacitor.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention. FIG. 2 is a bottom view of the solid electrolytic capacitor. As shown in FIGS. 1 and 2, the solid electrolytic capacitor includes a capacitor body (1), a seat plate (2) on which the capacitor body (1) is mounted, two anode terminals (3) and (3), And a cathode terminal (4).

  3 and 4 are sectional views taken along lines AA and BB shown in FIG. 2, respectively. As shown in FIGS. 3 and 4, the capacitor main body (1) includes a wound body (11) having a cylindrical shape, and a bottomed cylindrical metal case (5) for housing the wound body (11). And a sealing member (52) for sealing the opening (5b) of the metal case (5).

  FIG. 5 is a perspective view showing the wound body (11). As shown in FIG. 5, the wound body (11) is formed by winding two anode foils (111) and (111) with each anode foil (111) overlapped with a conductive separator (112). It is comprised by doing. Here, each anode foil (111) is made of a valve metal such as aluminum, tantalum, or niobium. A dielectric coating (not shown) is formed on the surface and end face of each anode foil (111).

  As the separator (112), a metal mesh or a metal or non-metal mesh having a metal layer formed on the surface thereof can be used. Here, the corrosion resistance of the separator (112) can be improved by employing a noble metal such as gold or platinum as the metal constituting the mesh. Further, as the separator (112), by using a metal layer made of metal such as gold or palladium by plating on the surface of a mesh made of metal such as copper or iron, the corrosion resistance of the separator (112) is improved. Can be improved.

  Various known separators can be used as the conductive separator (112).

  A solid electrolyte layer (not shown) is formed on the wound body (11). Here, the solid electrolyte layer is formed on the outer peripheral surface of the wound body (11), and a gap (specifically, two anode foils (111)) existing inside the wound body (11). (Gap existing between (111)) is filled in the gap. Further, a cathode layer (15) is formed on the solid electrolyte layer on the outer peripheral surface of the wound body (11), and the cathode layer (15) is located above the outer peripheral surface of the wound body (11). And a carbon layer (not shown) formed on the solid electrolyte layer and a silver paste layer (not shown) formed on the carbon layer. The solid electrolyte layer and the cathode layer (15) are electrically connected to each other.

  The metal case (5) is made of a conductive material such as aluminum. As shown in FIG. 4, the metal case (5) is integrally formed with a cathode lead (40) extending from the opening edge (50). Has been. The sealing member (52) is made of an electrically insulating material such as a resin material or a rubber material, and is fixed to the metal case (5) with the opening (5b) of the metal case (5) sealed. ing. Specifically, the sealing member (52) is fixed to the metal case (5) by caulking the opening edge of the metal case (5).

  Further, as shown in FIGS. 3 and 4, the open end of the metal case (5) is provided between the inner peripheral surface (5a) of the metal case (5) and the outer peripheral surface (15a) of the cathode layer (15). A conductive adhesive (51) for electrically connecting the metal case (5) and the cathode layer (15) to each other is interposed in a region near the edge (50). Therefore, the cathode layer (15) and the cathode lead (40) are electrically connected to each other via the metal case (5) and the conductive adhesive (51).

  Two anode leads (30) and (30) are electrically connected to each of the two anode foils (111) and (111) one by one. As shown in FIG. ) Is drawn from a winding end surface (11a) (lower end surface in FIG. 3) which is substantially orthogonal to the winding shaft (110) in the outer peripheral surface of the wound body (11).

  The sealing member (52) is formed with a small through hole (520) into which each anode lead (30) is inserted, and the through hole (520) has a lead-out portion (31) of each anode lead (30). ) Is inserted without gaps. Thereby, each anode lead (30) is supported by the sealing member (52), and thereby the wound body (11) is fixed in the metal case (5).

  On the other hand, the seat plate (2) has a plurality of through holes (20) to (20) penetrating the seat plate (2) from the upper surface (2a) to the lower surface (2b), respectively. Are provided corresponding to the positions P1 and P1 (see FIG. 3) of the anode lead (30) from the lead and the formation position P2 (see FIG. 4) of the cathode lead (40). Further, the lower surface (2b) of the seat plate (2) has a substantially rectangular shape formed of four edges (21) to (24) as shown in FIG.

  As shown in FIG. 3 (see also FIG. 2), the lead portion (31) of one anode lead (30) (the right anode lead in FIG. 3) of the two anode leads (30) and (30) is After passing through the corresponding through hole (20) of the seat plate (2), it bends in the vicinity of the outlet of the through hole (20), and then along the lower surface (2b) of the seat plate (2), It extends to the first edge (21) located in the vicinity of the through hole (20). Of the two anode leads (30) and (30), the lead-out portion (31) of the other anode lead (30) (the anode lead on the left side in FIG. 3) is formed on the corresponding seat plate (2). After passing through the through-hole (20), it bends in the vicinity of the outlet of the through-hole (20), and then is positioned in the vicinity of the through-hole (20) along the lower surface (2b) of the seat plate (2). Extending to the third edge (23) opposite to the first edge (21). A portion of each anode lead (30) extending along the lower surface (2b) of the seat plate (2) has a flat shape, and the anode terminal (3) of the solid electrolytic capacitor is constituted by the portion. Yes.

  As shown in FIG. 4 (see also FIG. 2), the cathode lead (40) passes through the corresponding through hole (20) of the seat plate (2) and then close to the outlet of the through hole (20). It bends and then is located in the vicinity of the through hole (20) along the lower surface (2b) of the seat plate (2) and is different from both edges of the first edge (21) and the third edge (23). It extends to the second edge (22). A portion of the cathode lead (40) extending along the lower surface (2b) of the seat plate (2) has a flat shape, and the cathode terminal (4) of the solid electrolytic capacitor is constituted by the portion. .

  Next, a method for manufacturing the solid electrolytic capacitor will be specifically described. In the manufacturing method, a foil production process, a winding process, a re-chemical conversion treatment process, an electrolyte layer formation process, a cathode layer formation process, an assembly process, and a terminal formation process are sequentially performed.

  In the foil preparation process (not shown), first, a metal foil to be the anode foil (111) is prepared, and the surface of the metal foil is etched to form a plurality of fine irregularities, thereby forming the surface area of the metal foil. Increase. Next, a chemical film is applied to the surface of the metal foil to form a dielectric film on the surface. Thereafter, the metal foil is cut to cut the metal foil into a long predetermined shape. As a result, a plurality of anode foils (111) to (111) whose surfaces are covered with the dielectric coating are produced. In the produced anode foil (111), a part of the anode foil (111) is exposed on the cut surface (end surface).

  In the winding step (see FIG. 5), after attaching one anode lead (30) to each of the two anode foils (111) and (111), the two anode foils (111) and (111) are attached. Between these layers, a conductive separator (112) is interposed and stacked, and from one side of the anode foil (111) opposite to the other anode foil (111), another conductive layer is separated. The separators (112) are overlaid. Thereafter, two anode foils (111) and (111) are wound with the one anode foil (111) inside, whereby a wound body (11) is produced. At this time, the end portion (111a) of the anode foil (111) is fixed to the outer peripheral surface of the wound body (11) by a winding tape (113) in order to prevent the wound body (11) from being deformed. In the winding process, stress is applied to the dielectric film by attaching the anode lead (30) to the anode foil (111) or winding of the anode foil (111) (111), thereby damaging the dielectric film. There is a fear.

  FIG. 6 is a diagram used for explaining the re-chemical conversion treatment process. As shown in FIG. 6, in the re-chemical conversion treatment step, first, a carrier bar (6) having conductivity is prepared. Then, the two anode leads (30), (30) of the wound body (11) are joined to the carrier bar (6), whereby the wound body (11) is attached to the carrier bar (6). The extending direction (91) of each anode lead (30) is fixed in a posture that is substantially perpendicular to the extending direction (92) of the carrier bar (6). A treatment tank (71) filled with the chemical conversion liquid (701) is prepared. Here, a cathode plate (710) is installed in the chemical conversion liquid (701). For example, an aqueous solution of adipic acid can be used as the chemical conversion solution (701).

  Thereafter, the carrier bar (6) is operated to immerse the wound body (11) in the chemical conversion liquid (701). Then, a voltage V is applied between the carrier bar (6) and the cathode plate (710) in a state where the wound body (11) is immersed in the chemical conversion liquid (701). As a result, a re-forming process is performed on the wound body (11). As a result, an oxide film (dielectric film) is formed on the exposed surface (that is, the cut surface (end surface)) of the anode foil (111). Also, the damaged part of the dielectric film is repaired, so that the entire surface of each anode foil (111) is covered with the dielectric film.

  In the electrolyte layer forming step, a chemical polymerization liquid for forming the solid electrolyte layer, specifically, a chemical polymerization liquid such as a conductive polymer is prepared, and the wound body (11) is immersed in the chemical polymerization liquid. As a result, a chemically polymerized film is formed on the outer peripheral surface of the wound body (11), and further, the separator (112) (112) is impregnated with the polymerization solution and polymerized, whereby the wound body (11) A chemical polymerization film is formed in a state in which the gap is filled in the gap (specifically, the gap between the two anode foils (111) and (111)). Thus, a solid electrolyte layer is formed. As the conductive polymer, for example, a polythiophene-based, polypyrrole-based, or polyaniline-based polymer can be used.

  In the cathode layer forming step, the wound body (11) is immersed in a carbon paste to form a carbon layer on the solid electrolyte layer above the outer peripheral surface of the wound body (11). Thereafter, the wound body (11) is immersed in a silver paste to form a silver paste layer on the carbon layer.

  FIG. 7 is a perspective view used for explaining the assembly process. As shown in FIG. 7, in the assembling process, first, the lead-out portion (31) of the anode lead (30) corresponding to this is inserted into each through hole (520) of the sealing member (52). Thereby, each anode lead (30) is supported by the sealing member (52), and thereby the wound body (11) is fixed to the sealing member (52).

  Next, the wound body (11) is accommodated in the metal case (5), and the opening (5b) of the metal case (5) is closed by the sealing member (52), and then the opening end of the metal case (5) is closed. The sealing member (52) is fixed to the metal case (5) by caulking the part. Thereby, the wound body (11) is fixed in the metal case (5), and the capacitor body (1) (see FIG. 1) is completed.

  Next, the capacitor body (1) is mounted on the seat plate (2). At this time, the lead portion (31) of each anode lead (30) is inserted into the corresponding through hole (20) of the seat plate (2). The cathode lead (40) is inserted into the corresponding through hole (20) of the seat plate (2).

  Thereafter, of the lead portion (31) of each anode lead (30), a portion protruding from the lower surface (2b) of the seat plate (2) is subjected to pressing, thereby deforming the portion into a flat shape. Then, the lead portion (31) of each anode lead (30) is bent in the vicinity of the outlet of the through hole (20) of the seat plate (2), so that the flat portion is formed on the lower surface (2b) of the seat plate (2). (See Fig. 3). Thereby, the anode terminal (3) of the solid electrolytic capacitor is formed.

  Also, a portion of the cathode lead (40) that protrudes from the lower surface (2b) of the seat plate (2) is subjected to pressing, thereby deforming the portion into a flat shape. Then, the cathode lead (40) is bent in the vicinity of the outlet of the through hole (20) of the seat plate (2) so that the flat portion is along the lower surface (2b) of the seat plate (2) (see FIG. 4). . Thereby, the cathode terminal (4) of the solid electrolytic capacitor is formed.

  Thus, the solid electrolytic capacitor of this embodiment is completed.

  In the solid electrolytic capacitor, when a voltage is applied between the anode terminal (3) and the cathode terminal (4), electrons on the cathode side in the wound body (11) become conductive separators (112 ) To the cathode terminal (4). Therefore, the electrons on the cathode side in the wound body (11) easily move to the cathode terminal (4). Therefore, according to the solid electrolytic capacitor, ESR of the solid electrolytic capacitor is reduced.

  In the solid electrolytic capacitor, the cathode foil is not wound around the wound body (11). For this reason, even if the dielectric film is damaged by the stress caused by the attachment of the anode lead (30) to the anode foil (111) and the winding of the anode foil (111), the anode foils (111) (111) It only conducts through the separator (112) having conductivity, and therefore, when performing the re-forming process, there is no adverse effect on the cathode side of the solid electrolytic capacitor. Therefore, even when the re-chemical conversion treatment step is executed, the capacitance of the solid electrolytic capacitor is not reduced.

  Further, in the above solid electrolytic capacitor, it is not necessary to wind the cathode foil in the process of producing it. Therefore, the amount of winding of the anode foil (111) can be increased by replacing the portion without the cathode foil with the anode foil (111). Therefore, according to the solid electrolytic capacitor, it is possible to realize a large capacity of the solid electrolytic capacitor.

  In the method for manufacturing the solid electrolytic capacitor, the voltage V is applied between all the anode leads (30) and (30) and the cathode plate (710) in the re-forming process. Therefore, the voltage V is applied almost evenly to the two anode foils (111) (111) constituting the wound body (11), and as a result, the re-forming process is performed on each anode foil (111). It will be executed reliably. Therefore, in all the anode foils (111) and (111), an oxide film (dielectric film) is formed on the exposed surface (that is, the cut surface (end surface)), and the damaged portion of the dielectric film is repaired. As a result, an electrical short circuit between each anode foil (111) and the solid electrolyte layer or separator (112) is prevented.

  The inventor of the present application conducts an experiment comparing the solid electrolytic capacitor of the present embodiment with a conventional solid electrolytic capacitor with respect to ESR, capacitance, and yield rate. Table 1 below shows the results of the experiment.

  Here, as the conventional solid electrolytic capacitor, the solid electrolytic capacitor shown in FIG. 11 using a conductive separator as the separator (803) (conventional example 1) and the solid electrolytic capacitor shown in FIG. ) Using a non-conductive separator (conventional example 2) was used. Specifically, in the solid electrolytic capacitor of Conventional Example 1, one anode foil and one cathode foil are wound with a conductive separator interposed therebetween, and the anode foil One anode lead is connected to the cathode foil, and one cathode lead is connected to the cathode foil. In the solid electrolytic capacitor of Conventional Example 2, two anode foils are wound with a paper separator interposed therebetween, and one anode lead is connected to each of the two anode foils. ing.

  Furthermore, in this experiment, the rated voltage was 6 V, the capacitance measurement frequency was 120 Hz, and the ESR measurement frequency was 100 kHz. Further, the outer dimensions of the wound body (11) of the solid electrolytic capacitor (example) of this embodiment and the outer dimensions of the wound bodies of the solid electrolytic capacitors of the conventional examples 1 and 2 are both 6.3 mm in diameter, The height dimension was 6.0 mm.

  As a result of the experiment (see Table 1), the capacitance of the example and the conventional example 2 is significantly larger than the capacitance of the conventional example 1. This is because the capacitance of the solid electrolytic capacitor is increased by the amount of winding of the anode foil (111). Further, the ESR of the example is significantly smaller than the ESRs of the conventional examples 1 and 2. This is because the cathode-side electrons in the wound body (11) can easily move to the cathode terminal (4) by using the conductive separator (112).

  Furthermore, the non-defective product rate of the example and the conventional example 2 is significantly larger than the non-defective product rate of the conventional example 1. This is because the cathode foil is not wound around the wound body in the solid electrolytic capacitor of the example and the conventional example 2, and therefore, the negative side of the solid electrolytic capacitor is not adversely affected when the re-forming process is performed. It is.

  FIG. 8 is a cross-sectional view showing a first modification of the solid electrolytic capacitor. FIG. 9 is a bottom view of the solid electrolytic capacitor according to this modification. As shown in FIG. 8, in the solid electrolytic capacitor, the metal case (5) is not provided with the cathode lead (40), but another cathode lead (44) is attached to the wound body (11). Good. Specifically, the cathode lead (44) is electrically connected directly to the separator (112). As shown in FIG. 8, the cathode lead (44) is a winding end face of the winding shaft (110). It is drawn from (11a).

  In addition to the through holes (20) and (20) provided in the seat plate (2) corresponding to the lead positions P1 and P1 of the anode lead (30) from the wound body (11), the winding Another through hole (201) is formed so as to correspond to the drawing position P3 of the cathode lead (44) from the body (11). The lead portion (441) of the cathode lead (44) passes through the corresponding through hole (201) of the seat plate (2) and then bends in the vicinity of the outlet of the through hole (201). It extends long to the second end edge (22) along the lower surface (2b) of the seat plate (2). A portion of the cathode lead (44) extending along the lower surface (2b) of the seat plate (2) has a flat shape, and the cathode terminal (4) of the solid electrolytic capacitor is constituted by the portion. .

  In the solid electrolytic capacitor according to this modification, the cathode lead (44) is electrically connected directly to the separator (112). Therefore, when a voltage is applied between the anode terminal (3) and the cathode terminal (4), electrons on the cathode side in the wound body (11) pass through the separator (112) having conductivity to the cathode terminal ( 4) Easy to move to. Therefore, according to the solid electrolytic capacitor, the ESR of the solid electrolytic capacitor is further reduced. Further, according to the solid electrolytic capacitor according to the present modification, the cathode layer (15) required in the solid electrolytic capacitor shown in FIG. 3 may not be provided.

  FIG. 10 is a perspective view showing a wound body (11) provided in the solid electrolytic capacitor in a second modification of the solid electrolytic capacitor. In the wound body (11) shown in FIG. 5, the outer peripheral surface is constituted by the anode foil (111). However, as shown in FIG. 10, the outer peripheral surface of the wound body (11) is the separator (112 ).

  When producing a solid electrolytic capacitor according to this modification, in the winding process, after attaching anode leads (30) one by one to two anode foils (111) and (111), the two anode foils are attached. (111) and (111) are overlapped with a separator (112) interposed therebetween, and another separator from one anode foil (111) opposite to the other anode foil (111). Overlay (112). Thereafter, the two anode foils (111) and (111) are wound inside the other anode foil (111), thereby producing a wound body (11).

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, in the solid electrolytic capacitor, the wound body (11) may be configured by winding one anode foil (111), or a plurality of anode foils (111 not limited to two sheets) ) To (111) may be wound. In the solid electrolytic capacitor, a plurality of anode leads (30) to (30), not limited to two, may be drawn from the wound body (11). Furthermore, the present invention is not limited to these configurations, and the above-described solid electrolytic capacitor can be variously modified within the technical scope described in the claims.

  In the solid electrolytic capacitor, the winding stopper tape (113) may be conductive. Thereby, an increase in ESR due to the provision of the anti-winding tape (113) can be suppressed.

(1) Capacitor body
(11) Winding body
(11a) Winding end face
(111) Anode foil
(112) Separator
(113) Winding tape
(15) Cathode layer
(2) Seat plate
(20) Through hole
(201) Through hole
(3) Anode terminal
(30) Anode lead
(31) Drawer
(4) Cathode terminal
(40) Cathode lead
(44) Cathode lead
(441) Drawer
(5) Metal case
(5a) Inner peripheral surface
(5b) Opening
(50) Open edge
(51) Conductive adhesive
(52) Sealing material
(6) Career bar
(701) Chemical liquid
(71) Treatment tank
(710) Cathode plate

Claims (3)

A wound body in which a plurality of anode foils each having a dielectric film formed on a surface and an end face are wound through a conductive separator;
A solid electrolyte layer formed inside the wound body;
A plurality of anode leads connected to the plurality of anode foils and drawn from a winding end surface of the wound body;
A solid electrolytic capacitor comprising a cathode lead electrically connected to the separator.   2. The solid electrolytic capacitor according to claim 1, wherein the separator is made of a metal mesh or a metal or non-metal mesh having a metal layer formed on a surface thereof. Connecting anode leads to a plurality of anode foils having a dielectric coating formed on the surface;
A step of forming a wound body by winding the plurality of anode foils through a separator having conductivity;
Immersing the wound body in a chemical conversion liquid and applying a voltage to the plurality of anode foils to form a dielectric coating on the end faces of the anode foils;
Electrically connecting a cathode lead to the separator;
And a step of forming a solid electrolyte layer inside the wound body.