Electrolytic capacitors

Abstract

The electrolytic capacitor includes a capacitor element, an anode lead terminal, a cathode lead terminal, and an outer casing. The anode lead terminal includes an anode terminal portion and a first rising portion. The first rising portion includes two exposed portions connected to the anode terminal portion and exposed from the outer casing, and a bent portion disposed between the two exposed portions and having a groove at the top. The bent portion is bent toward the first end face side in a manner that the groove is disposed in the outer casing. An anode lead is connected to the groove of the bent portion.

Description

Technical Field

[0001] The present invention relates to an electrolytic capacitor. Background Art

[0002] Electrolytic capacitors are installed in various electronic devices. Electrolytic capacitors generally include: a capacitor element having an anode portion and a cathode portion, an anode lead terminal, a cathode lead terminal, and an outer casing covering the capacitor element. The anode lead terminal is electrically connected to the anode portion, and the cathode lead terminal is electrically connected to the cathode portion.

[0003] In the past, various shapes of anode lead terminals have been proposed (for example, Patent Document 1 and Patent Document 2). Patent Document 1 discloses an anode terminal that divides a vertical sheet of a metal sheet having an L-shaped cross section having horizontal sheets and vertical sheets into three parts, and bends the central sheet 180° inwardly in such a way that the top end contacts the horizontal sheet. The anode lead wire of the capacitor element is welded at the fold of the bent central sheet. Patent Document 2 discloses an "anode lead frame that includes an anode terminal portion and an anode connecting portion, the anode connecting portion being formed by bending a portion of the anode terminal portion from the outside toward the inside in a direction to one side, and connected to the tantalum wire."

[0004] Prior Art Literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Utility Model Publication No. 59-004629

[0007] Patent Document 2: Japanese Patent Application Publication No. 2015-088718 Summary of the invention

[0008] Problems to be solved by the invention

[0009] At present, an electrolytic capacitor that can be mounted on a substrate with good reliability is required. In addition, an anode lead and an anode lead terminal are also required to be connected with good reliability. Under such circumstances, one of the objects of the present invention is to provide an electrolytic capacitor that can be mounted on a substrate with good reliability and that can connect the anode lead and the anode lead terminal with good reliability.

[0010] Solutions to Solve Problems

[0011] One embodiment of the present invention relates to an electrolytic capacitor. The electrolytic capacitor has a bottom surface, a front surface rising from the bottom surface, and a rear surface on the side opposite to the front surface, wherein the electrolytic capacitor includes: a capacitor element having a first end surface opposite to the front surface; an anode lead terminal and a cathode lead terminal electrically connected to the capacitor element; and an outer casing arranged around the capacitor element, the capacitor element including an anode lead protruding from the first end surface toward the front surface, the anode lead terminal including an anode terminal portion exposed on the bottom surface, and a first rising portion rising from the anode terminal portion, the first rising portion including two exposed portions connected to the anode terminal portion and exposed on the front surface, and a bent portion arranged between the two exposed portions and having a groove portion at the top end, the bent portion being bent toward the first end surface in a manner such that the groove portion is arranged in the outer casing, and the anode lead is connected to the groove portion of the bent portion.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to obtain an electrolytic capacitor which can be mounted on a substrate with good reliability and can connect an anode lead and an anode lead terminal with good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 It is schematically shown Figure 1 A front view of an electrolytic capacitor is shown.

[0016] Figure 3 It is schematically shown Figure 1 A cross-sectional view of an electrolytic capacitor is shown.

[0017] Figure 4 It is schematically shown Figure 1 A cross-sectional view showing the shape of a portion of a component of an electrolytic capacitor.

[0018] Figure 5 It is a front view schematically showing another example of the electrolytic capacitor of the present invention.

[0019] Figure 6 It is a cross-sectional view schematically showing another example of the electrolytic capacitor of the present invention.

[0020] Figure 7 It is a cross-sectional view schematically showing another example of the electrolytic capacitor of the present invention. DETAILED DESCRIPTION

[0021] The following examples are provided to illustrate the embodiments of the present invention, but the present invention is not limited to the examples described below. In the following description, specific values ​​and materials are sometimes illustrated, but other values ​​and materials may also be applied as long as the effects of the present invention can be obtained. It should be noted that the components other than the characteristic parts of the present invention may also be components of known electrolytic capacitors.

[0022] (Electrolytic Capacitors)

[0023] The electrolytic capacitor of the present invention has a bottom surface, a front surface rising from the bottom surface, and a rear surface on the side opposite to the front surface. Hereinafter, the bottom surface, the front surface and the rear surface are sometimes referred to as "bottom surface (B)", "front surface (F)", and "rear surface (R)", respectively. Like the front surface (F), the rear surface (R) also rises from the bottom surface (B). The electrolytic capacitor includes a capacitor element having a first end surface opposite to the front surface (F), an anode lead terminal and a cathode lead terminal electrically connected to the capacitor element, and an outer casing arranged around the capacitor element. Hereinafter, the first end surface opposite to the front surface (F) is sometimes referred to as the "first end surface (E1)". The capacitor element includes an anode lead protruding from the first end surface (E1) toward the front surface (F).

[0024] (Anode lead terminal)

[0025] The anode lead terminal includes an anode terminal portion exposed at the bottom surface (B), and a first rising portion rising from the anode terminal portion. The first rising portion includes two exposed portions connected to the anode terminal portion and exposed at the front surface (F), and a bent portion disposed between the two exposed portions and having a groove at the top. The bent portion is bent toward the first end surface (E1) so that the groove is disposed in the outer casing. An anode lead is connected to the groove of the bent portion.

[0026] The anode lead terminal can be formed by processing a metal sheet using a known metal processing method. The anode lead terminal can be produced, for example, by a bending process for forming the first rising portion and a process for forming the bent portion. The bent portion can be formed, for example, by forming a notch in a part of the metal sheet and bending it. Either the bending process for forming the first rising portion or the process for forming the bent portion can be performed first or simultaneously. In addition, when forming the bent portion, a part of the metal sheet around the bent portion can be removed by punching or the like.

[0027] The material of the anode lead terminal can be any material that can be used as the anode lead terminal of the electrolytic capacitor. For example, a known anode lead terminal material for an electrolytic capacitor can also be used. The anode lead terminal can also be formed by processing a metal sheet (including a metal plate and a metal foil) composed of a metal (copper, copper alloy, etc.). The surface of the metal sheet can also be plated with nickel plating, gold plating, etc. The thickness of the metal sheet constituting the anode lead terminal can be in the range of 25μm to 200μm (for example, in the range of 25μm to 100μm).

[0028] The method of connecting the groove of the bent portion and the anode lead is not particularly limited. They may be connected by a conductive adhesive material, solder, or welding. Examples of welding include resistance welding and laser welding.

[0029] In the electrolytic capacitor of the present invention, the anode lead terminal includes an anode terminal portion exposed on the bottom surface (B) and two exposed portions exposed on the front surface (F). That is, the anode terminal portion and the two exposed portions are continuous in an exposed state at the corner of the bottom surface (B) and the front surface (F). According to this structure, when the anode terminal portion is brazed to a substrate, etc., the entire anode terminal portion can be brazed with the solder wrapped around the exposed portion. Therefore, the brazing area can be increased, and the electrolytic capacitor can be mounted on a substrate, etc. with good reliability.

[0030] Furthermore, in the electrolytic capacitor of the present invention, the bent portion is bent toward the first end face (E1) in a manner configured in the outer casing. In the groove portion of the bent portion, the anode lead terminal is connected to the anode lead. On the other hand, in the above-mentioned patent document 1, the anode lead wire (anode lead) of the capacitor element is welded at the flat fold of the bent metal sheet. Therefore, compared with the electrolytic capacitor of patent document 1, the position of the anode lead is fixed by accommodating the anode lead in the groove portion. In addition, since the groove portion is located at the top of the bent portion, it does not protrude from the outer casing. Therefore, in the electrolytic capacitor of the present invention, the anode lead terminal and the anode lead can be connected with good reliability.

[0031] Furthermore, in the electrolytic capacitor of the present invention, the first end face (E1) of the capacitor element can be brought close to the bent portion. Therefore, the proportion (volume ratio) of the capacitor element in the electrolytic capacitor can be increased. Therefore, according to the present invention, the electrolytic capacitor can have a higher capacitance.

[0032] (Cathode lead terminal)

[0033] There is no particular limitation on the cathode lead terminal, and a known cathode lead terminal can be used. The cathode lead terminal can be formed by processing a metal sheet using a known metal processing method. The cathode lead terminal can also be formed of the metal sheet exemplified as the material of the anode lead terminal.

[0034] The top end portion of the bent portion of the anode lead terminal where the groove is formed may also extend substantially perpendicularly to the surface of the anode terminal. According to this structure, the anode lead can be reliably received in the groove, and the connection between the anode lead and the groove is also facilitated. It should be noted that substantially perpendicular refers to the angle A formed by the direction in which the top end extends and the surface of the anode terminal (see Figure 4 ) is in the range of 80 to 100° (e.g., in the range of 85 to 95°).

[0035] The electrolytic capacitor of the present invention can satisfy the following structure (1).

[0036] (1) The first rising portion of the anode lead terminal includes a lower portion connecting the lower ends of the two exposed portions, and the bent portion extends from the lower portion. According to this structure, the length of the bent portion can be shortened. Therefore, compared with the elongated anode connecting portion of Patent Document 2 having a length from the anode terminal portion to the tantalum wire (anode lead), the deformation of the bent portion can be reduced. Therefore, according to this structure, the anode lead terminal and the anode lead can be connected with particularly good reliability.

[0037] The electrolytic capacitor of the present invention may satisfy the following structures (2) to (4) in addition to the structure (1) described above. According to these structures, the mechanical strength of the first rising portion can be improved.

[0038] (2) The first rising portion of the anode lead terminal includes an upper portion connecting the upper ends of the two exposed portions.

[0039] (3) The anode lead terminal is formed by processing a metal sheet.

[0040] (4) The bent portion of the anode lead terminal is formed by bending a metal sheet surrounded by two exposed portions, an upper portion, and a lower portion.

[0041] The electrolytic capacitor of the present invention may have the following structures (5) to (7).

[0042] (5) The capacitor element has a second end face opposite to the first end face (E1) and a side peripheral surface connecting the periphery of the first end face (E1) and the peripheral surface of the second end face. Hereinafter, the second end face may be referred to as "second end face (E2)".

[0043] (6) The cathode lead terminal includes a cathode terminal portion exposed on the bottom surface (B) and a second rising portion rising from the cathode terminal portion and exposed on the rear surface (R). That is, the cathode terminal portion and the second rising portion are continuous and exposed at the corner between the bottom surface (B) and the rear surface (R).

[0044] (7) The cathode lead terminal and the capacitor element are connected via a conductive member disposed between the second rising portion and the second end surface (E2) and / or disposed between the cathode terminal portion and the side peripheral surface.

[0045] According to the above structures (5) to (7), it is not necessary to arrange an outer casing between the second end face (E2) and the rear surface (R). Therefore, the proportion (volume ratio) of the capacitor element in the electrolytic capacitor can be increased, and the electrolytic capacitor can be made high-capacitance. Furthermore, according to the above structures (5) to (7), the area that can be soldered can be increased for the cathode terminal portion, as with the anode terminal portion. Therefore, the electrolytic capacitor can be mounted on a substrate, etc. with better reliability. Furthermore, according to the above structures (5) to (7), the area of ​​the conductive member that can be arranged between the cathode portion and the cathode lead terminal can be increased, so that the resistance between the two can be reduced. In addition, by arranging the above-mentioned first rising portion and the second rising portion on the surface of the outer casing, it is possible to prevent moisture and the like from reaching the capacitor element. Therefore, the reliability of the electrolytic capacitor can be improved.

[0046] Alternatively, the anode lead may have a round bar shape, and the groove of the anode lead terminal may have an arc shape along the cross-sectional outer circumference of the round bar shape of the anode lead. Since the anode lead has a round bar shape and the groove of the anode lead terminal has an arc shape along the cross-sectional outer circumference of the round bar shape, it is easier to fix the position of the anode lead in the groove.

[0047] (Capacitor Components)

[0048] The capacitor element includes a columnar element portion having the above-mentioned first end face, and an anode lead protruding from the first end face of the element portion toward the front surface (F). The element portion may also be cylindrical or prismatic. The capacitor element is not particularly limited. The capacitor element may use a capacitor element used in a known solid electrolytic capacitor or a capacitor element having the same structure as the capacitor element. It should be noted that the electrolytic capacitor of the present invention may also include a plurality of capacitor elements. In this case, the anode portions of the plurality of capacitor elements are electrically connected to the anode lead terminal via the anode lead.

[0049] A capacitor element in one example includes an anode portion and a cathode portion. The anode portion includes an anode body and an anode lead having a dielectric layer formed on the surface, and the cathode portion includes an electrolyte layer and a cathode layer. The electrolyte layer is arranged between the dielectric layer and the cathode layer formed on the surface of the anode body. These constituent elements are not particularly limited, and constituent elements used in known solid electrolytic capacitors can be applied. Examples of these constituent elements are described below.

[0050] (Anode)

[0051] The anode body can use, for example, a columnar (e.g., rectangular) porous sintered body obtained by sintering particles as a material. Examples of the above-mentioned particles include particles of valve metals, particles of alloys containing valve metals, and particles of compounds containing valve metals. These particles can be used alone or in combination of two or more. As valve metals, titanium (Ti), tantalum (Ta), niobium (Nb), etc. are used. Alternatively, the anode body can also be formed by roughening the surface of a substrate (foil-shaped or plate-shaped substrate, etc.) containing a valve metal by etching or the like.

[0052] The anode portion can be manufactured by the following method. First, a portion of the anode lead is embedded in a metal powder as a material of the anode body, and the metal powder is pressurized into a columnar shape (e.g., a rectangular parallelepiped shape). Then, the metal powder is sintered to form an anode body. In this way, an anode portion including the anode body and a portion of the anode lead embedded in the anode body can be manufactured.

[0053] The dielectric layer formed on the surface of the anode body is not particularly limited and can be formed by a known method. For example, the anode body can be immersed in a chemical conversion solution to anodize the surface of the anode body to form the dielectric layer. Alternatively, the anode body can be heated in an oxygen-containing environment to oxidize the surface of the anode body to form the dielectric layer.

[0054] (Anode lead)

[0055] The anode lead may also be a wire (anode wire) made of metal. Examples of materials for the anode lead include the above-mentioned valve-acting metals, copper, aluminum, aluminum alloys, and the like. A portion of the anode lead is buried in the anode body, and the remaining portion protrudes from the anode body. The cross-sectional shape of the anode lead is not particularly limited, and may be circular, elliptical, track-shaped (a shape consisting of two parallel straight lines and two arcs connecting the ends of these straight lines to each other), rectangular, polygonal, and the like. In addition, the cross-sectional shape of the anode lead may also vary depending on the position. For example, near the protrusion from the anode body, the cross-section of the anode wire is circular, but may also be in the shape of a flat plate that is circumferentially flattened at the top end connected to the anode lead wire.

[0056] The tip of the anode lead protruding from the anode body is connected to the groove of the bent portion of the anode lead terminal. The tip may be a shape different from the shape of the groove. Alternatively, the tip may be a shape that fits into the groove. For example, when the groove is a shape including an arc, the tip may be circular.

[0057] (Electrolyte layer)

[0058] The electrolyte layer is not particularly limited, and the electrolyte layer used in the known solid electrolytic capacitor can be applied. It should be noted that in this specification, the electrolyte layer can be replaced by a solid electrolyte layer, and the electrolytic capacitor can be replaced by a solid electrolytic capacitor. The electrolyte layer can be a stack of two or more different electrolyte layers.

[0059] The electrolyte layer is configured to cover at least a portion of the dielectric layer. The electrolyte layer can also be formed using a manganese compound or a conductive polymer. Examples of conductive polymers include polypyrrole, polythiophene, polyaniline, and derivatives thereof. They can be used alone or in combination. In addition, the conductive polymer can also be a copolymer of two or more monomers. It should be noted that the derivative of the conductive polymer refers to a polymer with a conductive polymer as a basic skeleton. For example, examples of derivatives of polythiophene include poly(3,4-ethylenedioxythiophene) and the like.

[0060] A dopant may be added to the conductive polymer. The dopant may be selected according to the conductive polymer, or a known dopant may be used. Examples of dopants include naphthalenesulfonic acid, p-toluenesulfonic acid, polystyrenesulfonic acid, and salts thereof. In one example, the electrolyte layer is formed using poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrenesulfonic acid (PSS).

[0061] The electrolyte layer containing the conductive polymer can be formed by polymerizing a raw material monomer on the dielectric layer, or by applying a liquid containing the conductive polymer (and a dopant added as needed) to the dielectric layer and then drying the liquid.

[0062] (Cathode layer)

[0063] The cathode layer may be a conductive layer formed on the electrolyte layer, for example, a conductive layer formed in a manner covering the electrolyte layer. The cathode layer may include a carbon layer formed on the electrolyte layer, and a metal paste layer formed on the carbon layer. The carbon layer may also be formed of a conductive carbon material such as graphite and a resin. The metal paste layer may be formed of metal particles (such as silver particles) and a resin, or may be formed of, for example, a known silver paste.

[0064] The cathode layer is electrically connected to the cathode lead terminal. The cathode layer can be electrically connected to the cathode lead terminal via a conductive member. The conductive member can be formed of metal particles (eg, silver particles) and a resin, or can be formed of, for example, a known silver paste.

[0065] The cathode layer may also constitute a second end face (E2) on the side opposite to the first end face (E1). Moreover, the second end face (E2) may be electrically connected to the second rising portion of the cathode lead terminal via a conductive member. The cathode layer may also be connected to the cathode terminal portion via a conductive member. The cathode layer may also be connected to both the cathode terminal portion and the second rising portion via a conductive member.

[0066] (outer body)

[0067] The outer casing is arranged around the capacitor element in such a way that the capacitor element is not exposed on the surface of the electrolytic capacitor. Furthermore, the outer casing insulates the anode lead terminal from the cathode lead terminal. The outer casing may also be a known outer casing used in electrolytic capacitors. For example, the outer casing may also be formed using an insulating resin material used in sealing the capacitor element. Examples of materials for the outer casing include epoxy resin, phenolic resin, silicone resin, melamine resin, urea resin, alkyd resin, polyurethane, polyimide, and unsaturated polyester. The resin material constituting the outer casing may also contain substances other than resin (such as inorganic fillers). The outer casing may also include a shell that is arranged on at least a portion of the surface of the outer casing.

[0068] Hereinafter, an example of an electrolytic capacitor of the present invention will be specifically described with reference to the accompanying drawings. In the constituent elements of the electrolytic capacitor of the example described below, the above constituent elements can be applied. In addition, the constituent elements of the electrolytic capacitor of the example described below can be changed based on the above description. In addition, the matters described above can also be applied to the embodiments described below. In addition, in the embodiments described below, non-essential constituent elements of the electrolytic capacitor of the present invention can also be omitted.

[0069] (Implementation Method 1)

[0070] Figure 1 A perspective view schematically shows electrolytic capacitor 100 according to Embodiment 1. Figure 2 The front view of the electrolytic capacitor 100 as viewed from the first rising portion 122 side of the anode lead terminal 120 is schematically shown. Figure 3 A cross-sectional view through the anode lead (anode wire) 112 is schematically shown. It should be noted that, in order to facilitate understanding, in the following figures, some components are sometimes shown only by outline. In addition, in the following drawings, some components are sometimes omitted.

[0071] Referring to the drawings, the electrolytic capacitor 100 includes a capacitor element 110, an outer casing 101, an anode lead terminal 120, a cathode lead terminal 130, and a conductive member 141 (see Figure 3 ). External package 101 is formed so as to surround capacitor element 110 .

[0072] The electrolytic capacitor 100 has a bottom surface 100b, a front surface 100f rising from the bottom surface 100b, a rear surface 100r on the side opposite to the front surface, and an upper surface 100t on the side opposite to the bottom surface 100b. The capacitor element 110 has a first end surface 110a opposite to the front surface 100f, and a second end surface 110b on the side opposite to the first end surface 110a. Furthermore, the capacitor element 110 has a side peripheral surface 110s connecting the periphery of the first end surface 110a and the periphery of the second end surface 110b. The side peripheral surface 110s includes a bottom surface 110sb on the bottom surface 100b side, an upper surface 110st on the upper surface 100t side, and two side surfaces 110ss. The capacitor element 110 includes an anode lead 112 protruding from the end surface 110a toward the front surface 100f.

[0073] See also Figure 1 The anode lead terminal 120 includes an anode terminal portion 121 exposed at the bottom surface 100b and a first rising portion 122 rising from the anode terminal portion 121. The first rising portion 122 includes two exposed portions 122a, a lower portion 122b, an upper portion 122c, and a bent portion 122d.

[0074] The two exposed portions 122a are connected to the anode terminal portion 121 and exposed on the front surface 100f. The lower portion 122b connects the lower ends of the two exposed portions 122a and is connected to the anode terminal portion 121. The upper portion 122c connects the upper ends of the two exposed portions 122a. The portion of the first rising portion 122 other than the bent portion 122d has a quadrilateral frame shape.

[0075] The bent portion 122d is disposed between the two exposed portions 122a. The bent portion 122d has a groove 122dg at the top. The bent portion 122d extends from the lower portion 122b and bends toward the first end surface 110a. Specifically, the bent portion 122d extends from the lower portion 122b toward the first end surface 110a and then extends toward the upper surface 100t.

[0076] The top end of the bent portion 122d where the groove 122dg is formed may be substantially perpendicular to the surface (exposed surface) of the anode terminal 121. Specifically, the angle A formed by the direction D in which the top end of the groove 122dg extends and the surface 121s of the anode terminal 121 (see Figure 4 ) can be in the range of 80° to 100°. Figure 4and Figure 3 The cross section is also perpendicular to the bottom surface 100b and passes through the central axis of the anode lead 112. Figure 4 In the figure, hatching of some components is omitted.

[0077] The groove portion 122dg of the bent portion 122d is buried in the outer casing 101. The top end of the anode lead 112 is also buried in the outer casing 101. The groove portion 122dg is connected to the anode lead 112 by welding or the like. In order to suppress the intrusion of moisture or the like into the interior of the outer casing 101 and adversely affect the capacitor element 110, it is preferred that the connection portion between the bent portion 122d and the anode lead 112 is away from the front surface 100f. On the other hand, if the connection portion is too far away from the front surface 100f, it is sometimes difficult to increase the capacity. Taking this into consideration, the distance from the front surface 100f to the groove portion 122dg can be set to a range of 50 μm to 400 μm (for example, a range of 100 μm to 300 μm).

[0078] See also Figure 2 For the anode terminal portion 121, the height from the surface 121s to the anode lead 112 can be higher than the height h1 from the surface 121s to the upper end of the lower portion 122b of the rising portion 122, and can also be lower than the height h2 from the surface 121s to the lower end of the upper portion 122c of the rising portion 122.

[0079] See also Figure 2 The widths Wa of the two exposed portions 122 a may be in the range of 20% to 40% of the width W of the rising portion 122 . The width Wd of the bent portion 122 d may be in the range of 20% to 40% of the width W of the rising portion 122 .

[0080] The anode lead terminal 120 and the cathode lead terminal 130 can be formed by processing a metal sheet. The bent portion 122d can be formed by removing a portion of the metal sheet around the bent portion 122d and bending the metal sheet that will become the bent portion 122d. It should be noted that the bent portion 122d can also be formed without removing the metal sheet around the portion that will become the bent portion 122d. However, in terms of facilitating the configuration of the outer body (e.g., molded resin), it is preferred to remove a portion of the metal sheet around the bent portion 122d.

[0081] exist Figure 1 to Figure 3 In the description, an example is given in which the rising portion 122 includes the upper portion 122 c , but the rising portion 122 may not include the upper portion 122 c . Figure 5 The front view of an example of such an electrolytic capacitor 100a is shown. The electrolytic capacitor 100a can also obtain the same effects as the electrolytic capacitor 100.

[0082] See also Figure 3 The capacitor element 110 includes an anode portion 111 and a cathode portion 115. The anode portion 111 includes an anode body 113 having a dielectric layer 114 formed on the surface thereof and an anode lead 112. The cathode portion 115 includes an electrolyte layer 116 and a cathode layer 117 arranged in a manner covering the dielectric layer 114. 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 a metal paste.

[0083] The cathode lead terminal 130 includes a cathode terminal portion 131 and a second rising portion 132. The cathode terminal portion 131 is exposed at the bottom surface 100b. The second rising portion 132 rises from the cathode terminal portion 131 and is exposed at the rear surface 100r. In the electrolytic capacitor 100, the second rising portion 132 is connected to the cathode portion 115 (specifically, the cathode layer 117) through a conductive member 141. The conductive member 141 is, for example, a layer formed using a metal paste.

[0084] As described above, anode portion 111 of capacitor element 110 is electrically connected to anode lead terminal 120, and cathode portion 115 of capacitor element 110 is electrically connected to cathode lead terminal 130. When electrolytic capacitor 100 is mounted on a substrate of an electronic device, anode terminal portion 121 and cathode terminal portion 131 may be mounted by soldering them separately.

[0085] It should be noted that if Figure 6 As shown, the cathode lead terminal 130 and the capacitor element 110 may be connected via a conductive member 141 disposed between the cathode terminal portion 131 and the side circumferential surface 110s (specifically, the bottom surface 110sb) of the capacitor element 110. Alternatively, as Figure 7 As shown, cathode lead terminal 130 and capacitor element 110 may be connected via conductive member 141 disposed between cathode terminal portion 131 and side surface 110s (specifically bottom surface 110sb) of capacitor element 110 and conductive member 141 disposed between second rising portion 132 and second end surface 110b.

[0086] An example of a method for manufacturing the electrolytic capacitor 100 is described below. First, the capacitor element 110, the anode lead terminal 120, and the cathode lead terminal 130 are prepared. The method for manufacturing the capacitor element 110 is not particularly limited, and it can be manufactured by a known method. The anode lead terminal 120 and the cathode lead terminal 130 can be formed by a known metal processing method. In an example of forming the anode lead terminal 120, first, a portion of the surrounding of the bent portion 122d and the portion of the groove portion 122dg in the metal sheet as the anode lead terminal 120 are punched out and removed, and a portion serving as the bent portion 122d is formed by stamping. Next, the metal sheet is bent at the boundary between the two in such a manner that the first rising portion 122 rises from the anode terminal portion 121. In this way, the anode lead terminal 120 can be formed.

[0087] 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, for example, placing the top end of the anode lead terminal 120 in the groove 122dg of the bent portion 122d and then welding the two. The cathode layer 117 and the cathode lead terminal 130 can be connected by, for example, the following method. First, a metal paste is applied to the second rising portion 132 of the cathode lead terminal 130 and / or the second end face 110b of the capacitor element 110 (the surface of the cathode layer 117). Then, after the two are bonded together by the metal paste, the metal paste is converted into a conductive member 141 by heating. In this way, the cathode layer 117 can be connected to the cathode lead terminal 130.

[0088] Next, the capacitor element is sealed with the material of the outer casing 101 (eg, mold resin). The sealing step can be performed by a known method. In this way, the electrolytic capacitor 100 can be manufactured. It should be noted that other electrolytic capacitors of the present invention can also be manufactured by the same manufacturing method.

[0089] Industrial Applicability

[0090] The present invention can be used in electrolytic capacitors.

[0091] Description of reference numerals:

[0092] 100, 100a: electrolytic capacitor

[0093] 100b: Bottom

[0094] 100f: front surface

[0095] 100r: rear surface

[0096] 101: Exterior body

[0097] 110: Capacitor element

[0098] 110a: first end surface

[0099] 110b: Second end surface

[0100] 110s: Side surface

[0101] 112: Anode lead (anode wire)

[0102] 120: Anode lead terminal

[0103] 121: Anode terminal

[0104] 121s: Surface (surface of anode terminal portion)

[0105] 122: First rising part

[0106] 122a: Exposed part

[0107] 122b: Lower part

[0108] 122c: Upper

[0109] 122d: Bending part

[0110] 122dg: Groove

[0111] 130: Cathode lead terminal

[0112] 131: Cathode terminal

[0113] 132: Second rising part

[0114] 141: Conductive member.

Claims

1. An electrolytic capacitor comprising a bottom surface, an upper surface on a side opposite to the bottom surface, a front surface rising from the bottom surface, and a rear surface on a side opposite to the front surface, wherein: The electrolytic capacitor comprises: a capacitor element having a first end surface opposite to the front surface; an anode lead terminal and a cathode lead terminal electrically connected to the capacitor element; and an outer casing disposed around the capacitor element, The capacitor element includes an anode lead protruding from the first end surface toward the front surface, The anode lead terminal includes an anode terminal portion exposed on the bottom surface and a first rising portion rising from the anode terminal portion. The first rising portion includes two exposed portions connected to the anode terminal portion and exposed on the front surface, and a bent portion disposed between the two exposed portions and having a groove at the top end. The bent portion is bent toward the first end surface in such a manner that the groove portion is arranged in the outer casing, The tip portion of the bent portion where the groove is formed extends toward the upper surface substantially perpendicularly to the surface of the anode terminal portion. The anode lead is connected to the groove portion of the bent portion, The first rising portion includes a lower portion connecting the lower ends of the two exposed portions, The bent portion extends from the lower portion.

2. The electrolytic capacitor according to claim 1, wherein: The first rising portion includes an upper portion connecting the upper ends of the two exposed portions, The anode lead terminal is formed by processing a metal sheet. The bent portion is formed by bending a portion of the metal sheet surrounded by the two exposed portions, the upper portion, and the lower portion.

3. The electrolytic capacitor according to claim 1 or 2, wherein: The capacitor element has a second end surface on the side opposite to the first end surface, and a side peripheral surface connecting the peripheral edge of the first end surface and the peripheral edge of the second end surface. The cathode lead terminal includes a cathode terminal portion exposed on the bottom surface, and a second rising portion rising from the cathode terminal portion and exposed on the rear surface. The cathode lead terminal and the capacitor element are connected via at least one of a conductive member disposed between the second rising portion and the second end surface and a conductive member disposed between the cathode terminal portion and the side peripheral surface.

4. The electrolytic capacitor according to claim 1 or 2, wherein: The anode lead has a round bar shape, and the groove portion of the anode lead terminal has an arc shape along the outer circumference of the cross section of the round bar shape of the anode lead.

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