Electrolytic capacitor

Abstract

An electrolytic capacitor has a bottom surface and a top surface. The electrolytic capacitor includes: a capacitor element including an anode lead; an anode lead terminal and a cathode lead terminal electrically connected to the capacitor element; and an outer resin casing. At least one of the anode lead terminal and the cathode lead terminal includes: a terminal portion exposed on the bottom surface, and two anchoring portions extending from the terminal portion and embedded in the outer resin casing. The terminal portion has an end edge extending along the direction of the anode lead. Each of the two anchoring portions includes: an upright portion rising from the end edge of the terminal portion to the top surface, and an extension portion bent and extending from the upper end of the upright portion.

Description

Technical Field

[0001] This disclosure relates to electrolytic capacitors. Background Technology

[0002] Electrolytic capacitors are used in various electronic devices. An electrolytic capacitor typically comprises: a capacitor element with an anode and a cathode, anode leads, cathode leads, and an outer casing covering the capacitor element. The anode leads are electrically connected to the anode, and the cathode leads are electrically connected to the cathode.

[0003] Previously, lead terminals of various shapes have been proposed (for example, Patent Document 1). Patent Document 1 discloses an anode lead frame having an expansion portion that serves to strengthen the fixed installation strength of the molding portion.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-088718 Summary of the Invention

[0007] -The problem the invention aims to solve-

[0008] Currently, there is a need to improve the terminal strength of electrolytic capacitors. In this context, one of the objectives of this disclosure is to provide an electrolytic capacitor with higher terminal strength.

[0009] -Methods for solving the problem-

[0010] One aspect of this disclosure relates to an electrolytic capacitor. The electrolytic capacitor is an electrolytic capacitor having a bottom surface and an upper surface opposite to the bottom surface. The electrolytic capacitor includes: a capacitor element including an anode lead; an anode lead terminal and a cathode lead terminal electrically connected to the capacitor element; and an outer resin disposed around the capacitor element. At least one of the anode lead terminal and the cathode lead terminal includes: a terminal portion exposed on the bottom surface; and two anchor portions extending from the terminal portion and embedded in the outer resin. The terminal portion has an end edge extending along the direction of the anode lead. Each of the two anchor portions includes: an erected portion rising from the end edge of the terminal portion toward the upper surface, and an extension portion bent and extending from the upper end of the erected portion.

[0011] -Invention Effects-

[0012] This disclosure provides an electrolytic capacitor with high terminal strength. Attached Figure Description

[0013] Figure 1This is a perspective view schematically illustrating the structure of an example of the electrolytic capacitor of this disclosure.

[0014] Figure 2 It is a schematic representation Figure 1 A perspective view of a component of an electrolytic capacitor.

[0015] Figure 3 It is a schematic representation Figure 1 A cross-sectional view of the anode lead terminal of the electrolytic capacitor shown.

[0016] Figure 4 It is a schematic representation Figure 1 A cross-sectional view of the cathode lead terminal of the electrolytic capacitor shown.

[0017] Figure 5 It is a schematic representation Figure 1 A three-dimensional view of the bottom surface of the electrolytic capacitor shown.

[0018] Figure 6 It is a schematic representation Figure 1 The cross-sectional view of the electrolytic capacitor shown. Detailed Implementation

[0019] The following examples illustrate embodiments of this disclosure, but this disclosure is not limited to the examples described below. Specific values ​​and materials may be exemplified in the following description, but other values ​​and materials may also be applied as long as the effects of this disclosure are achieved. Furthermore, known structural elements of electrolytic capacitors may also be applied to structural elements other than the characteristic portions of this disclosure.

[0020] (Electrolytic capacitor)

[0021] The electrolytic capacitor disclosed herein has: a bottom surface and an upper surface on the side opposite to the bottom surface. Hereinafter, the bottom surface and the upper surface may be referred to as "bottom surface (B)" and "upper surface (T)". The electrolytic capacitor of this disclosure includes: a capacitor element including an anode lead, an anode lead terminal and a cathode lead terminal electrically connected to the capacitor element, and an outer resin disposed around the capacitor element.

[0022] At least one of the anode and cathode leads includes: a terminal portion exposed on the bottom surface (B), and two anchor portions extending from the terminal portion and embedded in the outer resin. Hereinafter, the lead terminal including these two anchor portions may be referred to as "lead terminal (L)". The terminal portion has an end edge extending in a direction D1 along the anode lead. Each of the two anchor portions includes: an upright portion rising from the end edge of the terminal portion to the upper surface (T), and an extension portion bending and extending from the upper end of the upright portion.

[0023] As described above, the anchoring portion (the raised portion and the extension portion) is embedded in the outer resin. Furthermore, the metal sheet constituting the lead terminal (L) is bent at two locations: the boundary between the terminal portion and the raised portion, and the boundary between the raised portion and the extension portion. With this structure, the direction of extension of the raised portion is different from the direction of extension of the extension portion. Therefore, the anchoring portion exerts a higher anchoring effect. Thus, with this disclosure, it is possible to suppress the separation of the lead terminal (L) from the outer resin. That is, with this disclosure, an electrolytic capacitor with high terminal strength and high reliability can be obtained.

[0024] The size of the anchoring part is not particularly limited, as long as the size is sufficient to achieve the anchoring effect. An example of the size of the anchoring part will be described in Embodiment 1.

[0025] The two anchoring portions included in a lead terminal (L) are typically symmetrical in shape with respect to a plane perpendicular to the bottom surface (B) and passing through the central axis of the anode lead, but they may not be symmetrical. When both the anode lead terminal and the cathode lead terminal include anchoring portions, the shape of the anchoring portion of the anode lead terminal may be the same as or different from the shape of the anchoring portion of the cathode lead terminal.

[0026] In the electrolytic capacitor of this disclosure, it is preferable that the entire surface of the extension is in contact with the outer resin. In another viewpoint, in the electrolytic capacitor of this disclosure, it is preferable that the anchoring portion is not in contact with the capacitor element. These structures result in a higher anchoring effect.

[0027] The two anchoring portions can be bent in different directions (opposite rotation direction) at the boundaries between the terminal portion and the raised portion, and at the boundaries between the raised portion and the extension portion, respectively. Here, "bending in different directions" means that the metal sheet constituting the lead terminal (L) is bent so that one side of the metal sheet (the side facing the upper surface (T)) is concave at the boundary between the terminal portion and the raised portion, and so that the same side is convex at the boundary between the raised portion and the extension portion. More specifically, the extension portions of the two anchoring portions can be bent from the upper end of the raised portion and extend in mutually distancing directions. That is, the extension portions of the two anchoring portions can be bent from the upper end of the raised portion and extend in mutually distancing directions with respect to a direction perpendicular to the direction of anode lead extension. The formation of the anchoring portions with this structure is simple. Furthermore, when using anchoring portions with this structure, it is easy to fill with an outer resin material (molding resin, etc.). Additionally, the two anchoring portions can be bent in the same direction (same rotation direction) at the boundaries between the terminal portion and the raised portion, and at the boundaries between the raised portion and the extension portion, respectively.

[0028] In the electrolytic capacitor disclosed herein, both the anode lead terminal and the cathode lead terminal may each include two anchoring portions. This structure provides an electrolytic capacitor with exceptionally high terminal strength and reliability. Alternatively, only the anode lead terminal or only the cathode lead terminal may include two anchoring portions.

[0029] The following describes an example of the structural elements of the electrolytic capacitor of this disclosure.

[0030] (Anode lead terminal)

[0031] The anode lead terminal can be formed by processing a metal sheet using a known metalworking method. The material of the anode lead terminal can be any material suitable for use as the anode lead terminal in an electrolytic capacitor. For example, a known material for anode lead terminals used in electrolytic capacitors can be used. The anode lead terminal can be formed by processing a metal sheet (including metal plates and metal foils) made of metal (copper, copper alloys, etc.). The surface of the metal sheet can be plated with nickel, gold, or other plating methods. The thickness of the metal sheet constituting the anode lead terminal can be in the range of 25 μm to 200 μm (e.g., 25 μm to 100 μm).

[0032] The anode lead terminal may include: an anode terminal portion exposed on the bottom surface (B) and a wire connection portion extending from the anode terminal portion to the upper surface (T). As described above, two anchoring portions may extend from the anode terminal portion. The anode lead of the capacitor element is connected to the wire connection portion. The wire connection portion may have a wire receiving portion at its front end that is bent approximately parallel to the bottom surface (B). The wire receiving portion may be bent toward the front of the capacitor element or in the opposite direction. Here, the front of the capacitor element refers to the end face of the capacitor element where the anode lead protrudes. The wire receiving portion allows for reliable and easy connection of the wire connection portion to the anode lead.

[0033] (Cathode lead terminal)

[0034] Cathode leads can be formed by processing a metal sheet using known metalworking methods. The material of the cathode lead can be any material suitable for use as the cathode lead of an electrolytic capacitor. For example, a known material used for cathode leads in electrolytic capacitors can be used. Cathode leads can also be formed from a metal sheet, for example, the material of an anode lead.

[0035] The cathode lead terminal may include: a cathode terminal portion exposed on the bottom surface (B), and a connecting portion electrically connected to the cathode portion of the capacitor element. The cathode portion of the capacitor element is electrically connected to the cathode terminal portion via this connecting portion. As described above, two anchoring portions may extend from the cathode terminal portion.

[0036] (Capacitor element)

[0037] The capacitor element is not particularly limited. The capacitor element can be a known solid electrolytic capacitor element or a capacitor element having the same structure. Furthermore, the electrolytic capacitor of this disclosure can comprise multiple capacitor elements. In this case, the anode portions of the multiple capacitor elements are electrically connected to the anode lead terminals.

[0038] An example capacitor element includes an anode portion and a cathode portion. The anode portion includes an anode body with a dielectric layer formed on its surface and anode leads, while the cathode portion includes an electrolyte layer and a cathode layer. The electrolyte layer is disposed between the dielectric layer formed on the surface of the anode body and the cathode layer. These structural elements are not particularly limited, and structural elements used in known solid electrolytic capacitors can be applied. Examples of these structural elements are described below.

[0039] (Anode)

[0040] The anode body can be made of a columnar (e.g., cuboid) porous sintered body obtained by sintering particles as the material. Examples of the particles mentioned above include particles containing a valve-acting metal, particles of an alloy containing a valve-acting metal, and particles of a compound containing a valve-acting metal. Only one type of these particles can be used, or two or more can be used in combination. Titanium (Ti), tantalum (Ta), niobium (Nb), etc., are used as valve-acting metals. Alternatively, the anode body can be formed by roughening the surface of a substrate (foil-like or plate-like substrate, etc.) containing a valve-acting metal using etching or the like.

[0041] The anode portion can be manufactured by the following method. First, a portion of the anode lead is embedded in metal powder, which serves as the anode body material, and the metal powder is pressed into a cylindrical shape (e.g., a cuboid). Then, the anode body is formed by sintering the metal powder. In this way, an anode portion comprising the anode body and a portion of the anode lead embedded within the anode body can be manufactured.

[0042] There are no particular limitations on the dielectric layer formed on the surface of the anode body, and it can be formed by known methods. For example, the dielectric layer can be formed by anodizing the surface of the anode body by immersing it in a forming solution. Alternatively, the dielectric layer can be formed by oxidizing the surface of the anode body by heating it in an oxygen-containing environment.

[0043] (Anode lead)

[0044] The anode lead can be a wire made of metal (anode wire). Examples of materials for the anode lead include the valve-acting metals mentioned above, copper, aluminum, aluminum alloys, etc. A portion of the anode lead is embedded in the anode body, while the remaining portion protrudes from the anode body. Additionally, the anode lead is typically rod-shaped, but it can also be plate-shaped.

[0045] (Electrolyte layer)

[0046] The electrolyte layer is not particularly limited and can be any electrolyte layer used in known solid electrolytic capacitors. Furthermore, in this specification, the electrolyte layer can be replaced with a solid electrolyte layer, and the electrolytic capacitor can be replaced with a solid electrolytic capacitor. The electrolyte layer can be a stack of two or more different electrolyte layers.

[0047] The electrolyte layer is configured to cover at least a portion of the dielectric layer. The electrolyte layer can be formed using manganese compounds or conductive polymers. Examples of conductive polymers include polypyrrole, polythiophene, polyaniline, and derivatives thereof. These can be used alone or in combination. Furthermore, the conductive polymer can be a copolymer of two or more monomers. Additionally, the term "derivative of conductive polymer" refers to a polymer with a conductive polymer as its basic backbone. For example, examples of polythiophene derivatives include poly(3,4-ethylenedioxythiophene).

[0048] Dopants can be added to conductive polymers. The dopants can be selected based on the conductive polymer, and known dopants can be used. Examples of dopants include naphthalenesulfonic acid, p-toluenesulfonic acid, polystyrenesulfonic acid, and their salts. An example electrolyte layer is formed using poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrenesulfonic acid (PSS).

[0049] An electrolyte layer containing a conductive polymer can be formed by polymerizing raw material monomers onto a dielectric layer. Alternatively, it can be formed by coating a liquid containing a conductive polymer (and, if necessary, a dopant) onto a dielectric layer and then allowing it to dry.

[0050] (Cathode layer)

[0051] The cathode layer can be a conductive layer formed on the electrolyte layer, or it can be a conductive layer formed to cover the electrolyte layer. The cathode layer can include a carbon layer formed on the electrolyte layer and a metal paste layer formed on the carbon layer. The carbon layer can be formed using a conductive carbon material such as graphite and a resin. The metal paste layer can be formed using metal particles (e.g., silver particles) and a resin, for example, it can be formed using silver paste.

[0052] The cathode layer is electrically connected to the cathode lead terminals. The cathode layer can be electrically connected to the cathode lead terminals via a conductive component. The conductive component can be formed using metal particles (e.g., silver particles) and resin, for example, using silver paste.

[0053] (Outer resin)

[0054] An outer resin is disposed around the capacitor element so that the capacitor element is not exposed on the surface of the electrolytic capacitor. Further, the outer resin insulates the anode lead terminals from the cathode lead terminals. Known outer resins used in electrolytic capacitors can be used as the outer resin. For example, the outer resin can be formed using an insulating resin material used in the sealing of the capacitor element. Examples of materials for the outer resin include epoxy resin, phenolic resin, silicone resin, melamine resin, urea resin, alkyd resin, polyurethane, polyimide, and unsaturated polyester. The outer resin may contain substances other than resin (inorganic fillers, etc.). The electrolytic capacitor may be contained within a housing disposed on at least a portion of the surface of the outer resin.

[0055] Hereinafter, an example of the electrolytic capacitor of the present disclosure will be specifically described with reference to the accompanying drawings. The structural elements described above can be applied to the structural elements of the electrolytic capacitor in the example described below. Furthermore, the structural elements of the electrolytic capacitor in the example described below can be modified based on the above description. Furthermore, the matters described above can also be applied to the embodiments described below. Moreover, in the embodiments described below, non-essential structural elements of the electrolytic capacitor of the present disclosure can be omitted.

[0056] (Implementation Method 1)

[0057] Figure 1 The figure shows a perspective view of the electrolytic capacitor 100 of Embodiment 1. Figure 2 The diagram illustrates the meaning. Figure 1 A perspective view of the anode lead terminal 120 and cathode lead terminal 130 of the electrolytic capacitor 100 shown. Figure 3 The middle section shows a cross-sectional view of the anchoring portion of the anode lead terminal 120. Figure 4 The image shows a cross-sectional view of the anchoring portion of the cathode lead terminal 130. Additionally, in... Figure 3 as well as Figure 4 In the diagram, the position of capacitor element 110 is indicated by a dashed line. Figure 5 The diagram illustrates the meaning. Figure 1 The electrolytic capacitor 100 shown is a bottom view. Figure 5 In the diagram, the portion embedded in the outer resin 101 is indicated by a dashed line. Further, Figure 6 The diagram illustrates the meaning. Figure 1 A cross-sectional view of the electrolytic capacitor 100 shown. Figure 6 The sectional view is a cross-sectional view passing through the central axis of the anode lead (anode wire) 112. Additionally, for ease of understanding, in the following figures, only a portion of the structural elements may be represented by outlines. For example, in... Figure 1 In the text, the outer resin 101 is represented only by an outline indicated by dashed lines.

[0058] The electrolytic capacitor 100 has a bottom surface 100b and an upper surface 100t on the side opposite to the bottom surface 100b. The electrolytic capacitor 100 includes a capacitor element 110, an anode lead terminal 120, a cathode lead terminal 130, a conductive member 141, and an outer resin 101. The anode lead terminal 120 and the cathode lead terminal 130 are electrically connected to the capacitor element 110.

[0059] Reference Figure 2 , Figure 5 The anode lead terminal 120 includes an anode terminal portion 121, a wire connection portion 122, and two anchoring portions 123. The anode terminal portion 121 is exposed on the bottom surface 100b. The wire connection portion 122 extends from the anode terminal portion 121 to the upper surface 100t. The groove of the wire connection portion 122 for receiving the front end of the anode lead 112 is formed by resistance welding the anode lead 112 to the wire connection portion 122. The anode lead 112 and the wire connection portion 122 can also be connected by soldering, tin soldering, etc.

[0060] Reference Figure 1 , Figure 2 Two anchoring portions 123 extend from two end edges 121e respectively. The two end edges 121e are the end edges of the anode terminal portion 121, that is, a pair of end edges extending in the direction D1 along the anode lead 112.

[0061] Reference Figure 1 , Figure 3Each of the two anchoring portions 123 includes an upright portion 123a that rises from the end edge 121e to the upper surface 100t, and an extension portion 123b that bends and extends from the upper end of the upright portion 123a. In an example shown in Embodiment 1, the two anchoring portions 123 are bent in different directions at the boundary between the anode terminal portion 121 and the upright portion 123a, and at the boundary between the upright portion 123a and the extension portion 123b. Specifically, one surface of the metal sheet constituting the anode lead terminal 120 (the surface on the upper surface 100t side) is concave at the boundary between the anode terminal portion 121 and the upright portion 123a, and convex at the boundary between the upright portion 123a and the extension portion 123b. As a result, the extension portion 123b extends from the upper end of the upright portion 123a to the outside of the electrolytic capacitor 100. In other words, the extensions 123b of the two anchoring portions 123 are bent from the upper end of the upright portion 123a and extend in opposite directions about a direction (D2) perpendicular to the direction (D1) of the anode lead 112. The direction in which the extensions 123b extend is approximately parallel to the bottom surface 100b, for example, the angle between them can be in the range of -20° to 20°.

[0062] The cathode lead terminal 130 includes a cathode terminal portion 131, a connecting portion 132, and two anchoring portions 133. The cathode terminal portion 131 is exposed on the bottom surface 100b. The connecting portion 132 extends from the anode terminal portion 121 to the upper surface 100t. The connecting portion 132 is electrically connected to the cathode portion 115 (cathode layer 117) described later via a conductive member 141. That is, the cathode terminal portion 131 is electrically connected to the capacitor element 110 via the connecting portion 132 and the conductive member 141. The conductive member 141 is not particularly limited, and a known conductive member can be used. For example, the conductive member 141 can be formed by metal paste or the like.

[0063] Two anchoring portions 133 extend from two end edges 131e respectively. The two end edges 131e are the end edges of the cathode terminal portion 131, that is, a pair of end edges extending in the direction D1 along the anode lead 112.

[0064] Reference Figure 1 , Figure 4Each of the two anchoring portions 133 includes an upright portion 133a that rises from the end edge 131e to the upper surface 100t, and an extension portion 133b that bends and extends from the upper end of the upright portion 133a. In an example shown in Embodiment 1, the two anchoring portions bend in different directions at the boundary between the cathode terminal portion 131 and the upright portion 133a, and at the boundary between the upright portion 133a and the extension portion 133b. In other words, the extension portions 133b of the two anchoring portions 133 bend from the upper end of the upright portion 133a and extend in mutually distancing directions about a direction (D2) perpendicular to the direction (D1) of the anode lead 112. The direction in which the extension portion 133b extends is approximately parallel to the bottom surface 100b, for example, the angle between them can be in the range of -20° to 20°.

[0065] Reference Figure 3 The distance L1 from the bottom surface of the anode terminal portion 121 to the bottom surface of the extension portion 123b can be 50 μm or more (e.g., 75 μm or more, 100 μm or more). By setting the distance L1 to 50 μm or more (e.g., 75 μm or more, 100 μm or more), it is easy to fill the space between the extension portion 123b and the bottom surface 100b with the outer resin 101. Furthermore, in Figure 3 In the process, the upper surface of the extension 123b is located below the bottom surface of the capacitor element 110, but the extension 123b can also be located at a higher position as long as it does not interfere with the capacitor element 110.

[0066] Reference Figure 4 The distance L3 from the surface of the cathode terminal portion 131 to the bottom surface of the extension portion 133b can be 50 μm or more (e.g., 75 μm or more, 100 μm or more), or it can be in the range of 50 μm to 500 μm (e.g., 75 μm to 200 μm). The distance L4 from the upper surface of the extension portion 133b to the bottom surface of the capacitor element 110 can be 50 μm or more (e.g., 75 μm or more, 100 μm or more), or it can be in the range of 50 μm to 500 μm (e.g., 75 μm to 200 μm). By setting the distances L1 and L3 to 50 μm or more (e.g., 75 μm or more, 100 μm or more), it is easy to fill the spacer resin 101 between the extension portion 133b and the bottom surface 100b and between the extension portion 133b and the capacitor element 110.

[0067] The horizontal distance W1 (distance along direction D2) from end edge 121e to the front end of extension 123b and the horizontal distance W2 (distance along direction D2) from end edge 131e to the front end of extension 133b can each be 50 μm or more (e.g., 75 μm or more, 100 μm or more). By setting the horizontal distances W1 and W2 to this range, a higher anchoring effect can be obtained. Furthermore, from the viewpoint of shape stability, processability, etc., the horizontal distances W1 and W2 can also be set to 200 μm or more.

[0068] Furthermore, the shapes of the anode lead terminal 120 and cathode lead terminal 130 described above are just examples and are not limited to the shapes described above. For example, neither the anode lead terminal 120 nor the cathode lead terminal 130 may include an anchoring portion. In addition, as long as the connecting portion of the cathode lead terminal 130 is electrically connected to the cathode portion 115 (cathode layer 117), it may not be in the position shown in the figure, nor may it have the shape shown in the figure.

[0069] Reference Figure 6 The capacitor element 110 includes an anode portion 111 and a cathode portion 115. The anode portion 111 includes an anode body 113 on which a dielectric layer 114 is formed, and an anode lead 112. The cathode portion 115 includes an electrolyte layer 116 configured to cover the dielectric layer 114, and a cathode layer 117. The cathode layer 117 includes, for example, a carbon layer formed on the electrolyte layer 116 and a metal particle layer formed on the carbon layer. The metal particle layer is, for example, a layer formed using metal paste.

[0070] As described above, the anode portion 111 of the capacitor element 110 is electrically connected to the anode lead terminal 120, and the cathode portion 115 of the capacitor element 110 is electrically connected to the cathode lead terminal 130. When the electrolytic capacitor 100 is mounted on the substrate of an electronic device, the anode terminal portion 121 and the cathode terminal portion 131 can be mounted by soldering, respectively.

[0071] The following describes an example of a method for manufacturing an electrolytic capacitor 100. First, a capacitor element 110, an anode lead terminal 120, and a cathode lead terminal 130 are prepared. The method for manufacturing the capacitor element 110 is not particularly limited and can be manufactured using known methods. The anode lead terminal 120 and the cathode lead terminal 130 can be formed using known metalworking methods.

[0072] Next, the anode lead 112 is connected to the anode lead terminal 120, and the cathode layer 117 is connected to the cathode lead terminal 130. The anode lead 112 and the anode lead terminal 120 can be connected by welding (e.g., laser welding). The connection between the cathode layer 117 and the cathode lead terminal 130 can be performed, for example, by the following method: First, a metal paste that serves as a conductive member 141 is applied to the surface of the connection portion 132 of the cathode lead terminal 130 and / or the surface of the cathode layer 117. Next, the cathode layer 117 and the connection portion 132 are bonded together using the metal paste, and the metal paste is cured, thereby making the metal paste a conductive member 141. In this way, the cathode layer 117 and the cathode lead terminal 130 can be connected.

[0073] Next, the capacitor element is sealed using a material (e.g., molding resin) of the outer resin 101. The sealing process can be performed using known methods. In this way, the electrolytic capacitor 100 can be manufactured. Furthermore, other electrolytic capacitors of this disclosure can also be manufactured using the same method.

[0074] Industrial availability

[0075] This disclosure can be used in electrolytic capacitors.

[0076] -Symbol Explanation-

[0077] 100: Electrolytic capacitor

[0078] 100B: Bottom surface

[0079] 100T: Upper surface

[0080] 101: Outer Resin

[0081] 110: Capacitor Components

[0082] 112: Anode lead

[0083] 120: Anode lead terminal

[0084] 121: Anode terminal section

[0085] 121E, 131E: End edge

[0086] 123, 133: Anchoring section

[0087] 123A: Erecting part

[0088] 123B: Extension

[0089] 130: Cathode lead terminal

[0090] 131: Cathode terminal section

[0091] 131E: End Edge

[0092] 133A: Erecting part

[0093] 133B: Extension

[0094] D1, D2: Direction.

Claims

1. An electrolytic capacitor having: a bottom surface and an upper surface opposite to the bottom surface, the electrolytic capacitor comprising: A capacitor element, comprising a cathode portion and an anode portion containing rod-shaped anode leads made of metal; The anode lead terminal is electrically connected to the anode lead of the capacitor element; The cathode lead terminal is electrically connected to the cathode portion of the capacitor element; and An outer resin is disposed around the capacitor element. The anode lead terminal and the cathode lead terminal are arranged along a first direction extending from the anode lead. The cathode lead terminal includes: a cathode terminal portion exposed on the bottom surface, and two cathode anchor portions extending from the cathode terminal portion and embedded in the outer resin. The cathode terminal portion has end edges along the first direction at both ends in a second direction perpendicular to the first direction. The cathode anchoring portion includes: a cathode erecting portion that rises from the end edge of the cathode terminal portion toward the upper surface, and a cathode extension portion that bends and extends from the upper end of the cathode erecting portion. The entire surface of the cathode extension is in contact with the outer resin. The anode lead terminal includes: The exposed anode terminal portion on the bottom surface; A wire connection portion that rises from the anode terminal portion toward the upper surface and is embedded in the outer resin, and is connected to the anode lead; and Two anode anchoring portions extend from the anode terminal portion and are embedded in the outer resin. The wire connection portion has a groove for receiving the front end of the anode lead. The anode anchoring portion includes: an anode erecting portion that rises from the end edge of the anode terminal portion along the first direction toward the upper surface, and an anode extension portion that bends and extends from the upper end of the anode erecting portion. The anode extension is electrically connected to the anode portion of the capacitor element only via a path from the wire connection portion through the anode terminal portion and through the anode stand-up portion. The horizontal distance from the end edge to the front end of the extension, i.e., the distance along the second direction, is 50 μm or more.

2. The electrolytic capacitor according to claim 1, wherein, The cathode extension of one of the two cathode anchoring portions and the cathode extension of the other of the two cathode anchoring portions bend from the upper end of the cathode upright portion and extend in mutually distancing directions. The anode extension of one of the two anode anchoring portions and the anode extension of the other of the two anode anchoring portions bend from the upper end of the anode erection portion and extend in opposite directions.

3. The electrolytic capacitor according to claim 1 or 2, wherein, The anode lead terminal includes the two anode anchoring parts. The cathode lead terminal includes the two cathode anchoring parts.

4. The electrolytic capacitor according to claim 1 or 2, wherein, The wire connection portion rises from the portion between the two anode anchoring portions of the anode terminal portion.

Images