Solid electrolytic capacitor and method for manufacturing solid electrolytic capacitor

Abstract

The disclosed solid electrolytic capacitor (10) is provided with: a plurality of capacitor elements (11) each having a positive electrode body (12) and a negative electrode part (13), the positive electrode bodies (12) partially protruding from both ends of the negative electrode part (13) and being stacked on each other; two anode terminals (17) electrically connected to the two protruding portions (12a) of the anode body (12), respectively; a cathode terminal (18) electrically connected to the cathode part (13); and an exterior resin (19) that covers at least a portion of the plurality of capacitor elements (11), the anode terminal (17), and the cathode terminal (18). The two protrusions (12a) of each capacitor element (11) are electrically conductive to each other. The cathode terminal (18) has: a mounting surface section (18a) exposed from the exterior resin (19); and a side wall part (18b) which is continuous with the mounting surface part (18a), is erected, and is electrically connected with the side surface of each cathode part (13). As a result, both excellent noise filtering characteristics and ease of manufacture can be achieved.

Description

Technical Field

[0001] The present disclosure relates to a solid electrolytic capacitor and a method for manufacturing the solid electrolytic capacitor. Background Art

[0002] Conventionally, surface-mount capacitors known as transmission line noise filters are known (e.g., Patent Document 1). The surface-mount capacitor in Patent Document 1 comprises a box-shaped resin molded case base, a plurality of capacitor elements stacked with anodes at both ends and a cathode in the center, and a box-shaped case cover. Optionally, a metal plate is also provided, which is secured to the inside of the case cover to supplement the conduction of the cathodes of the capacitor elements.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2009-076651 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, the surface-mount capacitor of Patent Document 1 is not easy to manufacture due to the large number of components. Furthermore, further improvements in noise filtering characteristics are desired for this type of surface-mount capacitor. Under such circumstances, one of the objectives of the present disclosure is to achieve both good noise filtering characteristics and ease of manufacture.

[0008] Solutions for solving problems

[0009] One technical solution disclosed herein relates to a solid electrolytic capacitor. The solid electrolytic capacitor comprises: a plurality of capacitor elements, each having an anode body and a cathode portion formed on the surface of the anode body via a dielectric layer, wherein portions of the anode body protrude from both ends of the cathode portion and are stacked on top of each other; two anode terminals electrically connected to the two protruding portions of the anode body, respectively; a cathode terminal electrically connected to the cathode portion; and an outer resin covering the plurality of capacitor elements, the anode terminals, and the cathode terminals in a manner such that portions of the anode terminals and the cathode terminals are exposed, wherein the two protruding portions of each capacitor element are electrically connected to each other, and the cathode terminal comprises a mounting surface portion exposed from the outer resin; and a sidewall portion extending continuously from the mounting surface portion and electrically connected to the side surface of each cathode portion.

[0010] Another technical solution disclosed herein relates to a method for manufacturing the aforementioned solid electrolytic capacitor. The method comprises the following steps: a first processing step of cutting and bending a predetermined frame coil to produce an intermediate product comprising the anode terminal and the cathode terminal, each of which is integrated with the other; a laminating step of laminating the plurality of capacitor elements on the intermediate product; a connecting step of electrically connecting the portion of the intermediate product corresponding to the anode terminal to the anode body, and the portion of the intermediate product corresponding to the cathode terminal to the cathode portion; a molding step of molding the plurality of capacitor elements and the intermediate product to form the exterior resin; and a second processing step of cutting and bending the intermediate product to form the anode terminal and the cathode terminal.

[0011] Effects of the Invention

[0012] According to the present disclosure, it is possible to achieve both good noise filtering characteristics and ease of manufacturing.

[0013] The novel features of the present invention are described in the appended claims, but the present invention, both in structure and content, together with other objects and features of the present invention, will be better understood through the following detailed description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a side perspective view schematically showing an example of the solid electrolytic capacitor of the present disclosure.

[0015] Figure 2 It is a side cross-sectional view schematically showing a capacitor element.

[0016] Figure 3 It is a perspective view schematically showing a plurality of capacitor elements and a cathode terminal. DETAILED DESCRIPTION

[0017] The following examples illustrate embodiments of the solid electrolytic capacitor and method for manufacturing the solid electrolytic capacitor disclosed herein. However, the present disclosure is not limited to the examples described below. While specific numerical values ​​and materials are sometimes cited in the following description, other numerical values ​​and materials may also be used as long as the effects of the present invention are achieved.

[0018] (Solid Electrolytic Capacitors)

[0019] The solid electrolytic capacitor disclosed herein can be used as a noise filtering component, such as a three-terminal transmission line component. The solid electrolytic capacitor disclosed herein comprises multiple capacitor elements, two anode terminals, a cathode terminal, and an outer resin. Furthermore, the number of anode terminals may be two or more, and the number of cathode terminals may be one or more.

[0020] The plurality of capacitor elements each include an anode body and a cathode portion formed on the surface of the anode body via a dielectric layer, with portions of the anode body protruding from opposite ends of the cathode portion. Hereinafter, the portions of the anode body protruding from the ends of the cathode portion are also referred to as protrusions. The plurality of capacitor elements are stacked one on top of the other. In each capacitor element, the two protrusions of the anode body are electrically conductive with each other. Each capacitor element may further include an insulating portion, which is provided between the anode body and the cathode portion to electrically insulate the two. The insulating portion may be formed, for example, of an insulating tape or an insulating resin.

[0021] The anode body can be made of a valve metal. Examples of valve metals for the anode body include aluminum, tantalum, niobium, and titanium. The anode body can be a valve metal foil or a sintered body of valve metal particles. Adjacent anode bodies in the stacking direction can be electrically connected to each other.

[0022] The dielectric layer may also cover at least a portion of the surface of the anode body. The dielectric layer may be composed of an oxide (e.g., aluminum oxide) formed on the surface of the anode body by a liquid phase method such as anodic oxidation, or a vapor phase method such as vapor deposition or atomic layer deposition. The dielectric layer is formed so as to be sandwiched between at least the anode body and the cathode portion.

[0023] The cathode portion may include a solid electrolyte layer covering at least a portion of the surface of the dielectric layer and a cathode layer covering at least a portion of the surface of the solid electrolyte layer. Adjacent cathode portions in the stacking direction may be electrically connected to each other. The solid electrolyte layer may include a conductive polymer. The solid electrolyte layer may further include a dopant as needed.

[0024] As the conductive polymer, known conductive polymers for solid electrolytic capacitors can be used, for example, π-conjugated conductive polymers can be used. As conductive polymers, for example, polymers with polypyrrole, polythiophene, polyaniline, polyfuran, polyacetylene, polyphenylene, polyphenylene vinylene, polybenzone and polythiophene vinylene as basic skeletons can be cited. Among them, polymers with polypyrrole, polythiophene or polyaniline as basic skeletons are preferred. The above polymers also include homopolymers, copolymers of two or more monomers and their derivatives (substitutes with substituents, etc.). For example, polythiophene includes poly (3,4-ethylenedioxythiophene) and the like. The conductive polymers can be used alone or in combination of two or more.

[0025] As a dopant, for example, at least one selected from the group consisting of low molecular anions and polyanions can be used. Examples of low molecular anions include sulfate ions, nitrate ions, phosphate ions, borate ions, organic sulfonate ions, carboxylate ions, and the like, without particular limitation. Examples of dopants that generate organic sulfonate ions include benzenesulfonic acid, p-toluenesulfonic acid, and naphthalenesulfonic acid. Examples of polyanions include high molecular weight polysulfonic acids and high molecular weight polycarboxylic acids. Examples of high molecular weight polysulfonic acids include polyvinylsulfonic acid, polystyrenesulfonic acid, polyallylsulfonic acid, polyacryloylsulfonic acid, and polymethacryloylsulfonic acid. Examples of high molecular weight polycarboxylic acids include polyacrylic acid and polymethacrylic acid. Polyanions also include polyester sulfonic acid and phenolsulfonic acid novolac resin. However, the polyanion is not limited thereto.

[0026] If necessary, the solid electrolyte layer may further contain known additives and known conductive materials other than the conductive polymer. Examples of such conductive materials include at least one selected from the group consisting of conductive inorganic materials such as manganese dioxide and TCNQ complex salts.

[0027] The cathode layer can be composed of a carbon layer formed on the surface of the solid electrolyte layer and a conductive layer formed on the surface of the carbon layer. The conductive layer can be composed of a silver paste. As the silver paste, for example, a composition containing silver particles and a resin component (binder resin) can be used. As the resin component, although thermoplastic resins can also be used, thermosetting resins such as imide resins and epoxy resins are preferably used.

[0028] The two anode terminals are electrically connected to the two protrusions of the anode body, respectively. In other words, one anode terminal (the first anode terminal) is electrically connected to the protrusion protruding from one end of the cathode portion, and the other anode terminal (the second anode terminal) is electrically connected to the protrusion protruding from the other end of the cathode portion. In addition, the first anode terminal and the second anode terminal can be divided into two or more parts, respectively. The anode terminal can be made of copper, a copper alloy, aluminum or an aluminum alloy, and can also be plated. The first anode terminal and the second anode terminal can be electrically connected to the two protrusions of each anode body of a plurality of capacitor elements. The anode terminal can be electrically connected to the protrusion by riveting, or by welding (such as laser welding or resistance welding).

[0029] The cathode terminal is electrically connected to the cathode portion. The cathode terminal can be electrically connected to each cathode portion of the plurality of capacitor elements. The cathode terminal can be electrically connected to the cathode portion via a conductive adhesive. The cathode terminal can be made of copper, a copper alloy, aluminum, or an aluminum alloy, and can also be plated. The material constituting the cathode terminal can be the same as or different from the material constituting the anode terminal. Each cathode terminal can be split into two or more parts.

[0030] The outer coating resin encapsulates the plurality of capacitor elements, the anode terminal, and the cathode terminal, with the anode terminal and cathode terminal partially exposed. The exposed portions of the anode terminal and cathode terminal function as external terminals of the solid electrolytic capacitor. The outer coating resin can be made of an insulating resin material. For example, the outer coating resin can be a cured product of a thermosetting resin such as epoxy resin and may contain fillers as needed.

[0031] The cathode terminal includes a mounting surface exposed from the exterior resin and a sidewall portion extending continuously from the mounting surface and electrically connected to the side surfaces of each cathode portion. In other words, the mounting surface and the sidewall portion are integrally formed. The mounting surface portion can be electrically connected to the cathode portion of the capacitor element closest to the mounting surface portion. The sidewall portion can be electrically connected to the side surfaces of each cathode portion via a conductive adhesive.

[0032] The presence of such a sidewall reduces the impedance of the cathode terminal's resistance and inductance components, improving the noise filtering characteristics of the solid electrolytic capacitor. Furthermore, because the sidewall is integrally formed with the mounting surface, a cathode terminal having both a mounting surface and a sidewall can be easily manufactured, for example, by bending a pre-determined frame coil. Thus, the solid electrolytic capacitor disclosed herein achieves both excellent noise filtering characteristics and ease of manufacture.

[0033] The cathode terminal may include two or more sidewall portions electrically connected to the side surfaces of each cathode portion. This structure can further improve the noise filtering characteristics of the solid electrolytic capacitor compared to a case where the sidewall portion is electrically connected to only one side surface of each cathode portion. Furthermore, the number of sidewall portions is not particularly limited.

[0034] The cathode terminal may further include an upper wall portion integrally formed with the side wall portion, covering at least a portion of the upper surface of the cathode portion of the capacitor element farthest from the mounting surface portion and electrically connected to the upper surface. This structure can further improve the noise filtering characteristics of the solid electrolytic capacitor.

[0035] (Method for Manufacturing Solid Electrolytic Capacitor)

[0036] The method for manufacturing a solid electrolytic capacitor disclosed herein is used to manufacture the above-mentioned solid electrolytic capacitor, and the method includes a first processing step, a lamination step, a connection step, a molding step, and a second processing step.

[0037] In the first processing step, a predetermined frame coil is subjected to cutting and bending to produce intermediate products of the anode terminal and the cathode terminal in a state where the frames are integrated with each other.

[0038] In the stacking step, multiple capacitor elements are stacked on the intermediate product. The multiple capacitor elements can be stacked so that the protruding portion of the anode body of each capacitor element is placed on the intermediate product with the anode terminal, and the cathode portion of each capacitor element is placed on the intermediate product with the cathode terminal.

[0039] In the connection step, the portion of the intermediate product corresponding to the anode terminal is electrically connected to the anode body, and the portion of the intermediate product corresponding to the cathode terminal is electrically connected to the cathode portion. The former electrical connection can be achieved, for example, by bending the intermediate product. The latter electrical connection can be achieved, for example, using a conductive adhesive.

[0040] In the molding process, multiple capacitor elements, anode terminals, and cathode terminals are molded to form the outer resin. In the molding process, the multiple capacitor elements, anode terminals, and cathode terminals can be arranged in a predetermined mold, and molten insulating resin (e.g., thermosetting resin) is injected into the mold and cured to form the outer resin.

[0041] In the second processing step, the intermediate product is cut and bent to form the anode terminal and the cathode terminal. In other words, in the second processing step, the intermediate product, which has been a single piece, is cut to form two or more independent anode terminals and one or more independent cathode terminals.

[0042] In the first processing step, a side wall portion may be provided on the intermediate product. In this case, the side wall portion can be used as a guide in the lamination step, thereby improving the ease of manufacturing the solid electrolytic capacitor.

[0043] As described above, according to the present disclosure, it is possible to achieve both good noise filtering characteristics and ease of manufacture using an integrated cathode terminal having a side wall portion.

[0044] Hereinafter, an example of a solid electrolytic capacitor and a method for manufacturing a solid electrolytic capacitor disclosed in the present invention will be described in detail with reference to the accompanying drawings. The constituent elements and processes of the solid electrolytic capacitor and the method for manufacturing a solid electrolytic capacitor described in the following example can be applied to the constituent elements and processes described above. The constituent elements and processes of the solid electrolytic capacitor and the method for manufacturing a solid electrolytic capacitor described in the following example can be changed based on the above description. In addition, the matters described below can also be applied to the above-mentioned embodiment. The constituent elements and processes of the solid electrolytic capacitor and the method for manufacturing a solid electrolytic capacitor described in the following example that are not necessary for the solid electrolytic capacitor and the method for manufacturing a solid electrolytic capacitor disclosed in the present invention can also be omitted. In addition, the figures shown below are schematic and do not accurately reflect the shape and number of actual components.

[0045] like Figures 1 to 3 As shown in FIG. 1 , the solid electrolytic capacitor 10 of this embodiment includes a plurality of (three in this example) capacitor elements 11, two anode terminals 17, a cathode terminal 18, and an outer resin 19. Figure 1 In FIG, a side wall portion 18b described later is indicated by a two-dot chain line.

[0046] The plurality of capacitor elements 11 each include an anode body 12 and a cathode portion 13 formed on the surface of the anode body 12 via a dielectric layer 14. Parts of the anode body 12 are formed from opposite ends of the cathode portion 13 ( Figure 1 The left and right ends of the anode body 12 protrude from the cathode portion 13. Hereinafter, the portions of the anode body 12 that protrude from both ends of the cathode portion 13 are also referred to as protrusions 12a. Multiple capacitor elements 11 are stacked one on top of another. In each capacitor element 11, the two protrusions 12a of the anode body 12 are electrically conductive with each other. Each capacitor element 11 also has an insulating portion 15, which is provided between the anode body 12 and the cathode portion 13 to electrically insulate them.

[0047] Anode body 12 is made of a foil of a valve metal (aluminum in this example), but is not limited thereto. Anode bodies 12 adjacent to each other in the stacking direction are electrically connected to each other. Therefore, all anode bodies 12 are electrically connected to each other.

[0048] Dielectric layer 14 covers at least a portion of the surface of anode body 12. Dielectric layer 14 is made of an oxide (aluminum oxide in this example) formed on the surface of anode body 12 subjected to a roughening treatment, but is not limited thereto.

[0049] Cathode portion 13 includes a solid electrolyte layer covering at least a portion of dielectric layer 14 and a cathode layer covering at least a portion of the surface of the solid electrolyte layer. Adjacent cathode portions 13 in the stacking direction are electrically connected to each other via conductive paste 16. Thus, all cathode portions 13 are electrically connected to each other. The solid electrolyte layer contains a conductive polymer and a dopant.

[0050] The cathode layer is composed of a carbon layer formed on the surface of the solid electrolyte layer and a conductor layer formed on the surface of the carbon layer. The conductor layer can be composed of a silver paste.

[0051] Two anode terminals 17 are electrically connected to the two protrusions 12a of anode body 12, respectively. Anode terminals 17 are made of, but are not limited to, a copper alloy. Anode terminals 17 are electrically connected to protrusions 12a by riveting. Alternatively, anode terminals 17 may be welded to protrusions 12a, instead of or in addition to riveting.

[0052] Cathode terminal 18 is electrically connected to cathode portion 13 via, for example, a conductive adhesive. Cathode terminal 18 is made of, but not limited to, a copper alloy. Cathode terminal 18 is made of the same material as anode terminal 17.

[0053] Outer resin 19 covers multiple capacitor elements 11, anode terminal 17, and cathode terminal 18, with each of anode terminal 17 and cathode terminal 18 partially exposed. The exposed portions of anode terminal 17 and cathode terminal 18 function as external terminals of solid electrolytic capacitor 10. Outer resin 19 is made of an insulating resin material containing filler.

[0054] The cathode terminal 18 includes a mounting surface 18a exposed from the exterior resin 19 and a side wall 18b extending continuously from the mounting surface 18a and electrically connected to the side surface of each cathode portion 13. Figure 1 The side wall portion 18b is electrically connected to the side surface of each cathode portion 13 via a conductive adhesive (not shown).

[0055] The cathode terminal 18 preferably has side surfaces ( Figure 1 Two or more side wall portions 18b are electrically connected (the side surfaces near the front and the back of the paper).

[0056] (Method for Manufacturing Solid Electrolytic Capacitor)

[0057] Next, a method for manufacturing the solid electrolytic capacitor 10 of this embodiment will be described. This manufacturing method includes a first processing step, a lamination step, a connection step, a molding step, and a second processing step.

[0058] In the first processing step, a predetermined frame coil (not shown) is cut and bent to produce intermediate products (not shown) of the anode terminal 17 and the cathode terminal 18 in an integrated state.

[0059] In the stacking step, multiple capacitor elements 11 are stacked on the intermediate product. At this time, multiple capacitor elements 11 are stacked so that protrusion 12a of anode body 12 of each capacitor element 11 is arranged on the intermediate product with anode terminal 17, and cathode portion 13 of each capacitor element 11 is arranged on the intermediate product with cathode terminal 18.

[0060] In the connection step, the portion of the intermediate product corresponding to anode terminal 17 is electrically connected to protrusion 12a of anode body 12 of each capacitor element 11, and the portion of the intermediate product corresponding to cathode terminal 18 is electrically connected to cathode portion 13 of each capacitor element 11. The former electrical connection can be achieved by bending the intermediate product. The latter electrical connection can be achieved using a conductive adhesive.

[0061] In the molding process, multiple capacitor elements 11, anode terminals 17, and cathode terminals 18 are molded to form exterior resin 19. In the molding process, multiple capacitor elements 11, anode terminals 17, and cathode terminals 18 are placed in a predetermined mold (not shown), and molten insulating resin is injected into the mold and solidified to form the exterior resin.

[0062] In the second processing step, the intermediate product is cut and bent to form anode terminal 17 and cathode terminal 18. In the second processing step, the intermediate product, which has been integrated until now, is cut to form two or more anode terminals 17 and cathode terminals 18 that are independent of each other.

[0063] In the first processing step, it is preferable to provide two or more side wall portions 18b on the intermediate product. In this case, the side wall portions 18b can be used as guides in the lamination step.

[0064] Postscript

[0065] The following techniques are disclosed based on the description of the above embodiments.

[0066] (Technique 1)

[0067] A solid electrolytic capacitor, wherein

[0068] This solid electrolytic capacitor has:

[0069] A plurality of capacitor elements each having an anode body and a cathode portion formed on a surface of the anode body with a dielectric layer interposed therebetween, wherein portions of the anode body protrude from both ends of the cathode portion and are stacked on top of each other;

[0070] two anode terminals, which are electrically connected to the two protruding portions of the anode body respectively;

[0071] a cathode terminal electrically connected to the cathode portion; and

[0072] an outer resin covering the plurality of capacitor elements, the anode terminal, and the cathode terminal in such a manner that the anode terminal and the cathode terminal are partially exposed;

[0073] The two protrusions of each capacitor element are electrically connected to each other,

[0074] The cathode terminal has:

[0075] a mounting surface exposed from the exterior resin; and

[0076] The side wall portion is continuous with the mounting surface portion and stands side by side, and is electrically connected to the side surfaces of the cathode portions.

[0077] (Technique 2)

[0078] The solid electrolytic capacitor according to technique 1, wherein

[0079] The cathode terminal includes two or more side wall portions electrically connected to side surfaces on both sides of each cathode portion.

[0080] (Technique 3)

[0081] The solid electrolytic capacitor according to technique 1 or 2, wherein

[0082] The cathode portion includes a solid electrolyte layer that covers at least a portion of the dielectric layer and includes a conductive polymer.

[0083] (Technique 4)

[0084] A method for manufacturing a solid electrolytic capacitor is the method for manufacturing a solid electrolytic capacitor according to any one of techniques 1 to 3, wherein:

[0085] The manufacturing method comprises the following steps:

[0086] In a first processing step, a predetermined frame coil is subjected to cutting and bending to produce intermediate products of the anode terminal and the cathode terminal in a state where the intermediate products are integrated with each other;

[0087] a lamination step of laminating the plurality of capacitor elements on the intermediate product;

[0088] a connecting step of electrically connecting a portion of the intermediate product corresponding to the anode terminal to the anode body, and electrically connecting a portion of the intermediate product corresponding to the cathode terminal to the cathode portion;

[0089] a molding step of molding the plurality of capacitor elements and the intermediate product to form the exterior resin; and

[0090] In the second processing step, the intermediate product is subjected to cutting and bending to form the anode terminal and the cathode terminal.

[0091] (Technique 5)

[0092] The method for manufacturing a solid electrolytic capacitor according to technique 4, wherein:

[0093] In the first working step, the side wall portion is provided on the intermediate product.

[0094] Example

[0095] The characteristics of the solid electrolytic capacitors 10 of the following examples and comparative examples were evaluated. Specifically, the noise suppression when a 100 MHz noise signal was input from one anode terminal 17 to the other anode terminal 17 was evaluated for the solid electrolytic capacitors 10 of the examples and comparative examples.

[0096] Implementation Example

[0097] The solid electrolytic capacitor 10 of the type shown in the above embodiment was evaluated. The noise suppression was -79.2 dB. The noise level, when the noise level of the solid electrolytic capacitor of the comparative example was set to 100%, was 62%.

[0098] Comparative Examples

[0099] A solid electrolytic capacitor having the same structure as the solid electrolytic capacitor 10 of the example except that the cathode terminal 18 did not have the side wall portion 18 b was evaluated. The noise suppression level was −75.0 dB.

[0100] As described above, the solid electrolytic capacitor 10 of the embodiment has a significantly higher noise suppression capability than the solid electrolytic capacitor of the comparative example. Therefore, it can be said that the superiority of the embodiment is demonstrated.

[0101] The present invention has been described by way of the presently preferred embodiments, but such disclosure should not be construed in a limiting sense. Various modifications and variations will undoubtedly become apparent to those skilled in the art upon reading the above disclosure. Therefore, the appended claims should be construed to include all modifications and variations that may be made without departing from the true spirit and scope of the present invention.

[0102] Industrial applicability

[0103] The present disclosure can be utilized in a solid electrolytic capacitor and a method for manufacturing a solid electrolytic capacitor.

[0104] Description of Reference Numerals

[0105] 10. Solid electrolytic capacitor; 11. Capacitor element; 12. Anode body; 12a. Protrusion; 13. Cathode portion; 14. Dielectric layer; 15. Insulating portion; 16. Conductive paste; 17. Anode terminal; 18. Cathode terminal; 18a. Mounting surface; 18b. Side wall portion; 19. Exterior resin.

Claims

1. A solid electrolytic capacitor, wherein: This solid electrolytic capacitor has: A plurality of capacitor elements each having an anode body and a cathode portion formed on a surface of the anode body with a dielectric layer interposed therebetween, wherein portions of the anode body protrude from both ends of the cathode portion and are stacked on top of each other; two anode terminals, which are electrically connected to the two protruding portions of the anode body respectively; a cathode terminal electrically connected to the cathode portion; as well as an outer resin covering the plurality of capacitor elements, the anode terminal, and the cathode terminal in such a manner that the anode terminal and the cathode terminal are partially exposed; The two protrusions of each capacitor element are electrically connected to each other, The cathode terminal has: a mounting surface exposed from the exterior resin; and The side wall portion is continuous with the mounting surface portion and stands side by side, and is electrically connected to the side surfaces of the cathode portions.

2. The solid electrolytic capacitor according to claim 1, wherein The cathode terminal includes two or more side wall portions electrically connected to side surfaces on both sides of each cathode portion.

3. The solid electrolytic capacitor according to claim 1 or 2, wherein: The cathode portion includes a solid electrolyte layer that covers at least a portion of the dielectric layer and includes a conductive polymer.

4. A method for manufacturing a solid electrolytic capacitor, which is the method for manufacturing a solid electrolytic capacitor according to claim 1 or 2, wherein: The manufacturing method comprises the following steps: In a first processing step, a predetermined frame coil is subjected to cutting and bending to produce intermediate products of the anode terminal and the cathode terminal in a state where the intermediate products are integrated with each other; a lamination step of laminating the plurality of capacitor elements on the intermediate product; a connecting step of electrically connecting a portion of the intermediate product corresponding to the anode terminal to the anode body, and electrically connecting a portion of the intermediate product corresponding to the cathode terminal to the cathode portion; a molding step of molding the plurality of capacitor elements and the intermediate product to form the exterior resin; as well as In the second processing step, the intermediate product is subjected to cutting and bending to form the anode terminal and the cathode terminal.

5. The method for manufacturing a solid electrolytic capacitor according to claim 4, wherein: In the first working step, the side wall portion is provided on the intermediate product.

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