WO2022138223A1 - 電解コンデンサ - Google Patents

電解コンデンサ Download PDF

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Publication number
WO2022138223A1
WO2022138223A1 PCT/JP2021/045457 JP2021045457W WO2022138223A1 WO 2022138223 A1 WO2022138223 A1 WO 2022138223A1 JP 2021045457 W JP2021045457 W JP 2021045457W WO 2022138223 A1 WO2022138223 A1 WO 2022138223A1
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WO
WIPO (PCT)
Prior art keywords
anode
terminal
region
electrolytic capacitor
lead terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/045457
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English (en)
French (fr)
Japanese (ja)
Inventor
貴行 松本
信博 谷垣
伸幸 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2022572134A priority Critical patent/JP7829153B2/ja
Priority to CN202180085851.9A priority patent/CN116724370A/zh
Priority to US18/254,874 priority patent/US12362102B2/en
Publication of WO2022138223A1 publication Critical patent/WO2022138223A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/008—Terminals
    • H01G9/012—Terminals specially adapted for solid capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/10—Sealing, e.g. of lead-in wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/15—Solid electrolytic capacitors

Definitions

  • This disclosure relates to electrolytic capacitors.
  • Electrolytic capacitors are installed in various electronic devices.
  • the electrolytic capacitor usually includes a capacitor element including an anode portion and a cathode portion, an anode lead terminal, a cathode lead terminal, and an exterior body covering the capacitor element.
  • the anode lead terminal is electrically connected to the anode portion
  • the cathode lead terminal is electrically connected to the cathode portion.
  • Patent Document 1 discloses a tantalum capacitor including an anode lead frame having an expansion portion that serves to enhance the adhesion strength with the molding portion.
  • the lead terminal includes a terminal portion having a main surface that can be a mounting surface on a printed circuit board or the like, and a part of the terminal portion is embedded in an exterior resin while exposing the main surface of the terminal portion on the bottom surface of the electrolytic capacitor.
  • the terminal portion may be separated from the exterior resin due to expansion of the lead terminal during the reflow process, and improvement in terminal strength is required. Further, it is also required to improve the connection strength between the main surface of the terminal portion and the printed circuit board or the like by soldering.
  • the anode lead frame described in Patent Document 1 has insufficient terminal strength and connection strength.
  • the electrolytic capacitor according to the first aspect of the present disclosure has a bottom surface and an upper surface opposite to the bottom surface, and includes a capacitor element including an anode lead, an anode lead terminal electrically connected to the capacitor element, and an anode lead terminal. It includes a cathode lead terminal and an exterior resin arranged around the capacitor element. At least one of the anode lead terminal and the cathode lead terminal is made of a metal sheet, and the terminal portion partially exposed on the bottom surface and the inside of the exterior resin from the terminal portion. Includes two anchors extending towards.
  • the terminal portion has a main surface exposed on the bottom surface and has an end side along a direction in which the anode lead extends.
  • Each of the two anchor portions includes an upright portion that rises from the end side of the terminal portion toward the upper surface, and an extending portion that bends and extends from the upper end of the upright portion.
  • the upright portion has a first region exposed from the bottom surface in the vicinity of the boundary with the end side, and the first region of the upright portion has an inclined surface connected to the main surface of the terminal portion.
  • the inclined surface is inclined so as to form an obtuse angle with the main surface of the terminal portion.
  • the electrolytic capacitor in the electrolytic capacitor, it is possible to increase the connection strength between the terminal portion and the printed circuit board while increasing the terminal strength.
  • the anode lead frame described in Patent Document 1 includes an anode terminal portion including two support portions (protruding portions).
  • the anode terminal and the board are joined by soldering. From the viewpoint of solder fillet formation, the tips of the two supports are slightly exposed from the bottom edge of the tantalum capacitor, respectively.
  • resin burrs tend to remain between the tips of the two support parts when the molding part is formed.
  • the resin burrs remaining between the tips of the two support portions fall off when the tantalum capacitor is mounted on the substrate, and mounting defects (such as solder height defects) are likely to occur.
  • the electrolytic capacitor according to the second aspect of the present disclosure has a bottom surface and an upper surface opposite to the bottom surface, and includes a capacitor element including an anode lead, an anode lead terminal electrically connected to the capacitor element, and an anode lead terminal. It includes a cathode lead terminal and an exterior resin arranged around the capacitor element.
  • the anode lead terminal is made of a metal sheet, and is electrically connected to an anode terminal portion having a first main surface and a second main surface opposite to the first main surface, and the tip of the anode lead.
  • the first main surface is exposed on the bottom surface, including the anode connection portion.
  • the anode terminal portion has a central first region and second A regions and second B regions on both sides of the first region.
  • the anode connection portion rises from the first region toward the upper surface.
  • the second A region and the second B region each include a protrusion extending from the first region and having a tip protruding from the end of the bottom surface.
  • the protrusion of the second A region and the protrusion of the second B region have side surfaces connected to the first main surface and the second main surface, respectively.
  • the side surface of the protrusion in the second A region and the side surface of the protrusion in the second B region face each other and are inclined in different directions with respect to the first main surface and the second main surface. is doing.
  • FIG. 3 is a cross-sectional view of a main part schematically showing a state in which the anode terminal portion of the electrolytic capacitor shown in FIG. 1 is connected to the substrate by soldering.
  • FIG. 3 is a perspective view schematically showing a part of the members of the electrolytic capacitor shown in FIG. 10. It is sectional drawing which shows typically the anode lead terminal of the electrolytic capacitor shown in FIG. It is sectional drawing which shows typically the cathode lead terminal of the electrolytic capacitor shown in FIG. It is a bottom view schematically showing the electrolytic capacitor shown in FIG.
  • the electrolytic capacitor of the present disclosure has a bottom surface and an upper surface opposite to the bottom surface.
  • the bottom surface and the top surface may be referred to as “bottom surface (B)" and “top surface (T)” below.
  • the electrolytic capacitor of the present 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 exterior resin arranged around the capacitor element.
  • At least one of the anode lead terminal and the cathode lead terminal is made of a metal sheet, and the terminal portion partially exposed on the bottom surface (B) and the terminal portion from the terminal portion to the inside of the exterior resin. Includes two anchors extending towards.
  • the lead terminal including the two anchor portions may be referred to as a "lead terminal (L)".
  • the terminal portion has a main surface exposed on the bottom surface (B).
  • the main surface may be referred to as a “main surface (S1)”.
  • the terminal portion has two ends along the direction in which the anode lead extends.
  • the direction may be referred to as “direction (D1)”
  • the direction perpendicular to the direction (D1) may be referred to as “direction (D2)”
  • the end side may be referred to as an "end side (E)".
  • Each of the two anchor portions includes an upright portion that rises from the end side (E) toward the upper surface (T) and an extension portion that bends and extends from the upper end of the upright portion.
  • the upright part (excluding the exposed area (A) described later) and the extending part of the anchor part are embedded in the exterior resin. Further, the metal sheet constituting the lead terminal (L) is bent at two points, the boundary between the terminal portion and the upright portion and the boundary between the upright portion and the extending portion. According to this configuration, the direction in which the upright portion extends and the direction in which the extending portion extends are different. Therefore, the anchor portion exhibits a high anchor effect. Therefore, according to the present disclosure, it is possible to prevent the lead terminal (L) from being separated from the exterior resin. That is, according to the present disclosure, an electrolytic capacitor having high terminal strength and reliability can be obtained.
  • Each of the upright portions of the two anchor portions has a region exposed from the bottom surface (B) in the vicinity of the boundary with the end side (E).
  • the area may be referred to as an “exposed area (A)”.
  • the exposed region (A) is formed by exposing a part of the terminal portion in the thickness direction on the bottom surface (B) (the terminal portion is arranged so that the main surface (S1) slightly protrudes from the outer surface of the exterior resin). Can be formed.
  • the exposed region (A) can also serve as a terminal portion, and can be a joint portion with the substrate by solder together with the terminal portion.
  • the exposed area (A) has an inclined surface connected to the main surface (S1).
  • the inclined surface may be referred to as an “inclined surface (S2)”.
  • the inclined surface (S2) is inclined so as to form an obtuse angle with the main surface (S1).
  • the two inclined surfaces (S2) are each formed along the end side (E), and the two inclined surfaces (S2) are provided on both sides in the direction of the terminal portion (D2). Therefore, the connection strength particularly in the direction (D2) can be effectively increased.
  • Such two inclined surfaces (S2) can be formed by utilizing the rising edge (E) of the upright portion of the two anchor portions.
  • the upright portion may stand at a substantially right angle (for example, more than 80 ° and less than 100 °) with respect to the terminal portion, and may be inclined so as to form an obtuse angle (for example, 100 ° or more and 150 ° or less) with the terminal portion. You may stand up.
  • the inclination angle ⁇ of the inclined surface (S2) with respect to the main surface (S1) is, for example, 135 ° to 175 °, and may be 145 ° to 165 °.
  • the inclination angle ⁇ is a cross section perpendicular to the direction (D1) of the electrolytic capacitor (a cross section including the terminal portion and the upright portion of the lead terminal (L)), or the electrolytic capacitor from the direction (D1). It is an angle formed by the main surface (S1) and the inclined surface (S2) when viewed.
  • the contour of the inclined surface (S2) may be a straight line or a curved shape such as an arc having a slight bulge. ..
  • the inclination angle ⁇ refers to the angle formed by the line segment (chord) connecting both ends of the curve (arc) and the main surface.
  • one end is the boundary between the inclined surface (S2) and the main surface (S1) (end side (E)), and the other end has an upright portion exposed on the bottom surface (B). This is the place to start.
  • the size of the anchor part there is no particular limitation on the size of the anchor part, as long as it is a size that can obtain the anchor effect.
  • An example of the size of the anchor portion will be described below.
  • the two anchors included in one lead terminal (L) are usually perpendicular to the bottom surface (B) and symmetrical with respect to the plane passing through the central axis of the anode lead, but they do not have to be symmetrical. good.
  • the shape of the anchor portion of the anode lead terminal and the shape of the anchor portion of the cathode lead terminal may be the same or different.
  • the entire surface of the extending portion is in contact with the exterior resin.
  • the anchor portion is not in contact with the capacitor element. According to these configurations, a high anchor effect can be obtained.
  • the two anchor portions may be bent in different directions (reverse rotation directions) at the boundary between the terminal portion and the upright portion and the boundary between the upright portion and the extending portion, respectively.
  • bending in different directions means that the metal sheet constituting the lead terminal (L) has a valley on one surface (the surface on the upper surface (T) side) of the metal sheet at the boundary between the terminal portion and the upright portion. It is bent, and means that the one side is bent so as to form a mountain at the boundary between the standing portion and the extending portion.
  • the extending portions of the two anchor portions may each bend from the upper end of the standing portion and extend in a direction away from each other.
  • the extending portions of the two anchor portions may each bend from the upper end of the upright portion and extend in a direction away from each other in a direction perpendicular to the direction in which the anode lead extends.
  • the anchor portion of this configuration is easy to form. Further, when the anchor portion having this configuration is used, it is easy to fill the material of the exterior resin (mold resin or the like).
  • the two anchor portions may be bent in the same direction (same rotation direction) at the boundary between the terminal portion and the upright portion and the boundary between the upright portion and the extending portion, respectively.
  • each of the anode lead terminal and the cathode lead terminal may include two anchor portions. According to this configuration, an electrolytic capacitor having particularly high terminal strength and reliability can be obtained. Alternatively, only the anode lead terminal may include two anchor portions, or only the cathode lead terminal may include two anchor portions.
  • the anode lead terminal may be formed by processing one metal sheet by a known metal processing method.
  • the material of the anode lead terminal may be any material that can be used as the material of the anode lead terminal of the electrolytic capacitor.
  • a known material for the anode lead terminal used in the electrolytic capacitor may be used.
  • the anode lead terminal may be formed by processing a metal sheet (including a metal plate and a metal foil) made of a metal (copper, copper alloy, etc.).
  • the surface of the metal sheet may be plated with nickel plating, gold plating, or the like.
  • the thickness of the metal sheet constituting the anode lead terminal may be in the range of 25 ⁇ m to 200 ⁇ m (for example, in the range of 25 ⁇ m to 100 ⁇ m).
  • the anode lead terminal may include an anode terminal portion exposed on the bottom surface (B) and a wire connection portion rising from the anode terminal portion toward the top surface (T). As described above, two anchor portions may extend from the anode terminal portion.
  • the anode lead of the capacitor element is connected to the wire connection portion.
  • the wire connecting portion may have a wire receiving portion bent so as to be substantially parallel to the bottom surface (B) at its tip.
  • the wire receiving portion may be bent toward the front surface of the capacitor element, or may be bent in the opposite direction.
  • the front surface of the capacitor element is a surface facing the end surface of the capacitor element from which the wire protrudes.
  • the wire receiving portion enables reliable and easy connection between the wire connecting portion and the anode lead.
  • the cathode lead terminal may be formed by processing one metal sheet by a known metal processing method.
  • the material of the cathode lead terminal may be any material that can be used as the material of the cathode lead terminal of the electrolytic capacitor.
  • a known cathode lead terminal material used for an electrolytic capacitor may be used.
  • the cathode lead terminal may be formed of a metal sheet exemplified as the material of the anode lead terminal.
  • the cathode lead terminal may include a cathode terminal portion exposed on the bottom surface (B) and a connection 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 the connection portion.
  • two anchor portions may extend from the cathode terminal portion.
  • the capacitor element is not particularly limited.
  • As the capacitor element a capacitor element used in a known solid electrolytic capacitor or a capacitor element having a similar configuration may be used.
  • the electrolytic capacitor of the present disclosure may include a plurality of capacitor elements. In that case, the anode portions of the plurality of capacitors are electrically connected to the anode lead terminals.
  • An example capacitor element includes an anode part and a cathode part.
  • the anode portion includes an anode body having a dielectric layer formed on the surface thereof and an anode lead
  • the cathode portion includes an electrolyte layer and a cathode layer.
  • the electrolyte layer is arranged between the dielectric layer formed on the surface of the anode and the cathode layer.
  • anode body for example, a columnar (for example, rectangular parallelepiped) porous sintered body obtained by sintering particles as a material may be used.
  • the above-mentioned particles include particles of 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 kind of these particles may be used, or two or more kinds of these particles may be mixed and used.
  • the valve acting metal titanium (Ti), tantalum (Ta), niobium (Nb) and the like are used.
  • the anode may be formed by roughening the surface of a base material (such as a foil-shaped or plate-shaped base material) containing a valve acting metal by etching or the like.
  • the anode part may be manufactured by the following method. First, a part of the anode reed is embedded in the metal powder which is the material of the anode body, and the metal powder is pressure-molded into a columnar shape (for example, a rectangular shape). Then, the anode body is formed by sintering the powder of the metal. In this way, an anode portion including an anode body and an anode lead partially embedded in the anode body can be produced.
  • the dielectric layer formed on the surface of the anode is not particularly limited, and may be formed by a known method.
  • the dielectric layer may be formed by immersing the anode body in the chemical conversion liquid and anodizing the surface of the anode body.
  • the dielectric layer may be formed by heating the anode body in an atmosphere containing oxygen to oxidize the surface of the anode body.
  • the anode lead may be a wire made of metal (anode wire). Examples of materials for the anode reed include the valve acting metals, copper, aluminum, aluminum alloys and the like described above. A part of the anode lead is embedded in the anode body, and the rest protrudes from the anode body.
  • the anode lead is usually rod-shaped, but may be plate-shaped.
  • the electrolyte layer is not particularly limited, and an electrolyte layer used in a known solid electrolytic capacitor may be applied.
  • the electrolyte layer may be read as a solid electrolyte layer, and the electrolytic capacitor may be read as a solid electrolytic capacitor.
  • the electrolyte layer may be a laminate of two or more different electrolyte layers.
  • the electrolyte layer is arranged so as to cover at least a part of the dielectric layer.
  • the electrolyte layer may be formed by using a manganese compound or a conductive polymer.
  • conductive polymers include polypyrrole, polythiophene, polyaniline, and derivatives thereof. These may be used alone or in combination of a plurality of types. Further, the conductive polymer may be a copolymer of two or more kinds of monomers.
  • the derivative of the conductive polymer means a polymer having a conductive polymer as a basic skeleton.
  • examples of derivatives of polythiophene include poly (3,4-ethylenedioxythiophene) and the like.
  • Dopants may be added to the conductive polymer.
  • the dopant can be selected according to the conductive polymer, and a known dopant may be used.
  • Examples of dopants include naphthalene sulfonic acid, p-toluenesulfonic acid, polystyrene sulfonic acid, and salts thereof.
  • An example electrolyte layer is formed using polystyrene sulfonic acid (PSS) -doped poly (3,4-ethylenedioxythiophene) (PEDOT).
  • the electrolyte layer containing the conductive polymer may be formed by polymerizing the raw material monomer on the dielectric layer. Alternatively, it may be formed by applying a liquid containing a conductive polymer (and a dopant if necessary) to the dielectric layer and then drying it.
  • the cathode layer may be a conductive layer formed on the electrolyte layer, or may be, for example, a conductive layer formed so as to cover 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 be formed of a conductive carbon material such as graphite and a resin.
  • the metal paste layer may be formed of metal particles (for example, silver particles) and a resin, or may be formed of, for example, silver paste.
  • the cathode layer is electrically connected to the cathode lead terminal.
  • the cathode layer may be electrically connected to the cathode lead terminal via a conductive member.
  • the conductive member may be formed of metal particles (for example, silver particles) and a resin, or may be formed of, for example, silver paste.
  • the exterior resin is arranged around the capacitor element so that the capacitor element is not exposed on the surface of the electrolytic capacitor. Further, the exterior resin insulates the anode lead terminal and the cathode lead terminal.
  • a known exterior resin used for an electrolytic capacitor may be applied to the exterior resin.
  • the exterior resin may be formed by using an insulating resin material used for sealing the capacitor element. Examples of exterior resin materials include epoxy resins, phenolic resins, silicone resins, melamine resins, urea resins, alkyd resins, polyurethanes, polyimides, unsaturated polyesters and the like.
  • the exterior resin may contain a substance other than the resin (such as an inorganic filler).
  • FIG. 3 shows a cross-sectional view of the anchor portion of the anode lead terminal 120.
  • FIG. 4 shows a cross-sectional view of the anchor portion of the cathode lead terminal 130.
  • the position of the capacitor element 110 is shown by a dotted line, and the outline of the exterior resin 101 is shown by a solid line.
  • 3 and 4 are views showing a cross section perpendicular to the direction (D1) of the electrolytic capacitor 100.
  • the bottom view of the electrolytic capacitor 100 shown in FIG. 1 is schematically shown in FIG. In FIG. 5, the portion embedded in the exterior resin 101 is shown by a dotted line.
  • FIG. 6 shows a cross-sectional view of a main part showing the vicinity of the boundary between the anode terminal portion 121 and the upright portion 123a in the electrolytic capacitor 100 shown in FIG.
  • FIG. 7 is a cross-sectional view of a main part showing a state in which the anode terminal portion 121 of the electrolytic capacitor 100 shown in FIG. 1 is connected to the substrate 202 by the solder 201.
  • 6 and 7 are views showing a cross section perpendicular to the direction (D1) of the electrolytic capacitor 100.
  • D1 the direction
  • FIG. 8 is a cross-sectional view that passes through the central axis of the anode lead (anode wire) 112.
  • anode lead anode wire
  • FIG. 1 the exterior resin 101 is shown only by the outline represented by the dotted line.
  • the electrolytic capacitor 100 has a bottom surface 100b and a top surface 100t on the opposite side of 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 exterior resin 101.
  • the anode lead terminal 120 and the cathode lead terminal 130 are each electrically connected to the capacitor element 110.
  • the anode lead terminal 120 includes an anode terminal portion 121, a wire connection portion 122, and two anchor portions 123.
  • a part of the anode terminal portion 121 in the thickness direction (for example, about 1 ⁇ 2 of the thickness of the anode terminal portion 121) is exposed on the bottom surface 101b.
  • the anode terminal portion 121 has a main surface 121S exposed on the bottom surface 100b.
  • the wire connecting portion 122 rises from the anode terminal portion 121 toward the upper surface 100t.
  • the groove portion of the wire connecting portion 122 for receiving the tip of the anode lead 112 is formed by resistance welding the anode lead 112 and the wire connecting portion 122.
  • the anode lead 112 and the wire connecting portion 122 may be connected by welding, soldering, or the like.
  • the two anchor portions 123 extend from the two end sides 121e, respectively.
  • the two end sides 121e are the ends of the anode terminal portion 121, and are a pair of end sides along the direction D1 in which the anode lead 112 extends.
  • each of the two anchor portions 123 includes an upright portion 123a that rises from the end side 121e toward the upper surface 100t, and an extending portion 123b that bends and extends from the upper end of the upright portion 123a.
  • the two anchor portions 123 are bent in different directions at the boundary between the anode terminal portion 121 and the upright portion 123a and the boundary between the upright portion 123a and the extending portion 123b, respectively. There is.
  • one surface (the surface on the upper surface 100t side) of the metal sheet constituting the anode lead terminal 120 is valley-folded at the boundary between the anode terminal portion 121 and the upright portion 123a, and is formed with the upright portion 123a. It is a mountain fold at the boundary with the extending portion 123b.
  • the extending portion 123b extends from the upper end of the standing portion 123a toward the outside of the electrolytic capacitor 100. That is, the extending portions 123b of the two anchor portions 123 are bent from the upper end of the upright portion 123a, respectively, and are oriented away from each other in the direction (D2) perpendicular to the direction (D1) in which the anode lead 112 extends. It is extended.
  • the direction in which the extending portion 123b extends is substantially parallel to the bottom surface 100b, and for example, the angle formed by the two may be in the range of ⁇ 20 ° to 20 °.
  • each of the upright portions 123a of the two anchor portions 123 has a region 124 exposed on the bottom surface 100b at the boundary with the end side 121e.
  • the region 124 has an inclined surface 124S connected to the main surface 121S, and the inclined surface 124S is inclined so as to form an obtuse angle with the main surface 121S.
  • FIG. 7 when the anode terminal portion 121 of the electrolytic capacitor 100 and the substrate 202 are bonded by the solder 201, the joint portion formed by the solder 201 is likely to form a fillet due to the presence of the region 124 having the inclined surface 124S. Adhesive strength is increased.
  • the inclination angle ⁇ ( ⁇ in FIG. 6) of the inclined surface 124S with respect to the main surface 121S is, for example, 135 ° to 175 °, and may be 145 ° to 165 °.
  • FIG. 6 shows a cross section (a cross section including the anode terminal portion 121 and the upright portion 123a) perpendicular to the direction (D1) of the electrolytic capacitor 100.
  • the contour of the inclined surface 124S in FIG. 6 is curved, and ⁇ (inclination angle ⁇ ) in FIG. 6 is formed by a line segment L2 connecting both ends of the curve of the contour of the inclined surface 124S and a main surface 121S.
  • the cathode lead terminal 130 includes a cathode terminal portion 131, a connection portion 132, and two anchor portions 133.
  • a part of the cathode terminal portion 131 in the thickness direction (for example, about 1 ⁇ 2 of the thickness of the cathode terminal portion 131) is exposed on the bottom surface 101b.
  • the cathode terminal portion 131 has a main surface 131S exposed on the bottom surface 100b.
  • the connection portion 132 is arranged so as to have a step with the cathode terminal portion 131.
  • the connecting portion 132 is electrically connected to the cathode portion 115 (cathode layer 117) described later via the conductive member 141.
  • 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 may be used.
  • the conductive member 141 may be formed of a metal paste or the like.
  • the two anchor portions 133 each extend from the two end sides 131e.
  • the two end sides 131e are the ends of the cathode terminal portion 131, and are a pair of end sides along the direction D1 in which the anode lead 112 extends.
  • each of the two anchor portions 133 includes an upright portion 133a that rises from the end side 131e toward the upper surface 100t, and an extension portion 133b that bends and extends from the upper end of the upright portion 133a.
  • the boundary between the cathode terminal portion 131 and the upright portion 133a and the boundary between the upright portion 133a and the extending portion 133b are bent in different directions. That is, the extending portions 133b of the two anchor portions 133 are bent from the upper end of the upright portion 133a, respectively, and are oriented toward each other in a direction (D2) perpendicular to the direction (D1) in which the anode lead 112 extends. It is extended.
  • the direction in which the extending portion 133b extends is substantially parallel to the bottom surface 100b, and for example, the angle formed by the two may be in the range of ⁇ 20 ° to 20 °.
  • each of the upright portions 133a of the two anchor portions 133 has a region 134 exposed on the bottom surface 100b at the boundary with the end side 131e.
  • the region 134 has an inclined surface 134S connected to the main surface 131S, and the inclined surface 134S is inclined so as to form an obtuse angle with the main surface 131S.
  • the contour of the inclined surface 134S is curved in the cross section perpendicular to the direction (D1) of the electrolytic capacitor 100 (the cross section including the cathode terminal portion 131 and the upright portion 133a), and the inclination angle ⁇ of the inclined surface 134S with respect to the main surface 131S. Is shown as in the case of the inclined surface 124S.
  • the inclination angle ⁇ of the inclined surface 134S is, for example, 135 ° to 175 °, and may be 145 ° to 165 °.
  • the distance L1 from the surface of the anode terminal portion 121 to the lower surface of the extending portion 123b may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more).
  • the distance L1 By setting the distance L1 to 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more), it becomes easy to fill the lower portion of the extending portion 123b with the exterior resin 101.
  • the upper surface of the extending portion 123b is located below the lower surface of the capacitor element 110, but the extending portion 123b is located at a higher position unless the extending portion 123b interferes with the capacitor element 110. You may.
  • the distance L3 from the surface of the cathode terminal portion 131 to the lower surface of the extending portion 133b may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more), and may be in the range of 50 ⁇ m to 500 ⁇ m (for example, 75 ⁇ m). It may be in the range of ⁇ 200 ⁇ m).
  • the distance L4 from the upper surface of the extending portion 133b to the lower surface of the capacitor element 110 may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more), and is in the range of 50 ⁇ m to 500 ⁇ m (for example, the range of 75 ⁇ m to 200 ⁇ m). May be good.
  • the horizontal distance W1 (distance along the direction D2) from the end side 121e to the tip of the extending portion 123b and the horizontal distance W2 (distance along the direction D2) from the end side 131e to the tip of the extending portion 133b are Each may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more).
  • the horizontal distances W1 and W2 may be set to 200 ⁇ m or more, respectively.
  • the shapes of the anode lead terminal 120 and the cathode lead terminal 130 described above are examples, and are not limited to the above shapes.
  • either the anode lead terminal 120 or the cathode lead terminal 130 may not include an anchor portion.
  • the connecting portion of the cathode lead terminal 130 may not be at the position shown in the figure or may not have the shape shown in the figure as long as it is electrically connected to the cathode portion 115 (cathode layer 117).
  • the upright portion 123a rises substantially perpendicular to the anode terminal portion 121 (for example, more than 80 ° and less than 100 °), but is inclined so as to form an obtuse angle with the anode terminal portion 121 as shown in FIG. It may be an upright portion 153a.
  • the upright portion 153a may stand at an obtuse angle of, for example, 100 ° to 150 ° with respect to the anode terminal portion 121.
  • the inclination angle ⁇ of the inclined surface 154S with respect to the main surface 121S may be adjusted. ..
  • the upright portion of the cathode lead terminal may be inclined so as to form an obtuse angle with the cathode terminal portion.
  • 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 its surface, and an anode lead 112.
  • the cathode portion 115 includes an electrolyte layer 116 arranged so as 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 by using a metal paste.
  • 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.
  • the electrolytic capacitor 100 When the electrolytic capacitor 100 is mounted on a substrate or the like of an electronic device, it may be mounted by soldering the anode terminal portion 121 and the cathode terminal portion 131, respectively.
  • 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 the capacitor element 110 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.
  • the anode lead 112 and the anode lead terminal 120 are connected, and the cathode layer 117 and the cathode lead terminal 130 are connected.
  • the anode lead 112 and the anode lead terminal 120 can be connected by welding (for example, laser welding) or the like.
  • the cathode layer 117 and the cathode lead terminal 130 can be connected by, for example, the following method. First, a metal paste to be 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.
  • the cathode layer 117 and the connecting portion 132 are adhered to each other via the metal paste, and the metal paste is cured to form the conductive member 141. In this way, the cathode layer 117 and the cathode lead terminal 130 can be connected.
  • the capacitor element is sealed with the material of the exterior resin 101 (for example, mold resin).
  • the sealing step can be carried out by a known method.
  • the electrolytic capacitor 100 can be manufactured.
  • the other electrolytic capacitors disclosed in the present disclosure can also be manufactured by the same manufacturing method.
  • the electrolytic capacitor of the present disclosure has a bottom surface and an upper surface opposite to the bottom surface.
  • the bottom surface and the top surface may be referred to as “bottom surface (B)” and “top surface (T)” below.
  • the electrolytic capacitor of the present 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 exterior resin arranged around the capacitor element.
  • direction in which the anode lead extends may be referred to as “direction (D1)”.
  • the direction perpendicular to the direction in which the anode lead extends may be referred to as "direction (D2)".
  • the anode lead terminal is made of a metal sheet.
  • the anode lead terminal includes an anode terminal portion having a first main surface and a second main surface opposite (back side) to the first main surface, and an anode connection portion electrically connected to the tip of the anode lead.
  • the first main surface is exposed on the bottom surface (B). From the viewpoint of forming a solder fillet, a part of the anode terminal portion in the thickness direction may be exposed on the bottom surface (B).
  • the anode terminal portion has a central first region and second A regions and second B regions on both sides of the first region.
  • the anode connection portion is arranged so as to rise from the first region toward the upper surface (T).
  • the second A region and the second B region each include a protrusion extending from the first region and having a tip protruding from the end of the bottom surface (B).
  • the protrusions in the second A region and the protrusions in the second B region usually extend from the first region in the direction (D1).
  • the anode terminal portion is arranged so that the tip of the protruding portion slightly protrudes from the end of the bottom surface (B) when the electrolytic capacitor is viewed from the bottom surface (B) side.
  • the second main surface is exposed at the tip of the protruding portion and is in contact with the exterior resin in a region other than the tip of the protruding portion.
  • the protruding portion of the second A region and the protruding portion of the second B region have side surfaces connected to the first main surface and the second main surface, respectively.
  • the side surface is referred to as a “side surface (S)”.
  • the side surface (S) of the protrusion in the second A region and the side surface (S) of the protrusion in the second B region face each other and are inclined in different directions with respect to the first main surface and the second main surface. There is. That is, the two side surfaces (S) are inclined in different directions from the first main surface to the second main surface.
  • the side surface (S) of the protruding portion of the second A region and the side surface (S) of the protruding portion of the second B region are inclined so as to form an obtuse angle with the first main surface, respectively.
  • the side surface (S) is inclined so as to form an acute angle with the second main surface.
  • a good solder fillet is likely to be formed, and the connection strength between the anode terminal portion and the substrate is enhanced.
  • the inclination angle of the side surface (S) with respect to the first main surface may be 100 ° or more and 135 ° or less, or 110 ° or more and 135 ° or less. When the inclination angle is within the above range, the effect of suppressing mounting defects and the effect of improving the connection strength can be easily obtained.
  • the inclination angle of the side surface (S) with respect to the first main surface is an angle formed by the first main surface and the side surface (S) when the electrolytic capacitor (anode terminal side) is viewed from the direction (D1).
  • the contour of the side surface (S) may be a linear shape or a curved shape such as an arc having a slight bulge.
  • the inclination angle refers to the angle formed by the line segment (chord) connecting both ends of the curve (arc) and the first main surface.
  • the side surfaces (S) of the protrusions of the second A region and the second B region may be inclined so as to form an acute angle with the first main surface, respectively.
  • the side surface (S) is inclined so as to form an obtuse angle with the second main surface.
  • the inclination angle of the side surface (S) with respect to the first main surface may be 45 ° or more, 80 ° or less, and 45 ° or more. , 70 ° or less.
  • the second A region and the second B region (excluding the protrusion) are usually shaped perpendicular to the bottom surface (B) and symmetrical with respect to the plane passing through the central axis of the anode lead, but not symmetrically. May be good.
  • the protrusions of the second A region and the second B region are usually perpendicular to the bottom surface (B) and symmetrical with respect to the plane passing through the central axis of the anode lead.
  • At least one of the anode lead terminal and the cathode lead terminal has a terminal portion having an exposed main surface on the bottom surface (B) and the terminal portion (in the case of the anode terminal portion, the second A region and the second B). It may include two anchor portions extending from the region) and embedded in the exterior resin.
  • the lead terminal including the two anchor portions may be referred to as a “lead terminal (L)”.
  • the terminal portion in the case of the anode terminal portion, the second A region and the second B region
  • the two anchor portions are an upright portion that rises from the end side of the terminal portion (in the case of the anode terminal portion, the second A region and the second B region) toward the upper surface (T), and an extension that bends and extends from the upper end of the upright portion. It may include a part.
  • the anchor part (standing part and extending part) is embedded in the exterior resin. Further, the metal sheet constituting the lead terminal (L) is bent at two points, the boundary between the terminal portion and the upright portion and the boundary between the upright portion and the extending portion. According to this configuration, the direction in which the upright portion extends and the direction in which the extending portion extends are different. Therefore, the anchor portion exhibits a high anchor effect. Therefore, it is suppressed that the lead terminal (L) (terminal portion) is separated from the exterior resin, and the terminal strength is enhanced.
  • the size of the anchor part there is no particular limitation on the size of the anchor part, as long as it is a size that can obtain the anchor effect.
  • An example of the size of the anchor portion will be described below.
  • the two anchors included in one lead terminal (L) are usually perpendicular to the bottom surface (B) and symmetrical with respect to the plane passing through the central axis of the anode lead, but they do not have to be symmetrical. good.
  • the shape of the anchor portion of the anode lead terminal and the shape of the anchor portion of the cathode lead terminal may be the same or different.
  • the entire surface of the extending portion is in contact with the exterior resin.
  • the anchor portion is not in contact with the capacitor element. According to these configurations, a high anchor effect can be obtained.
  • the two anchor portions may be bent in different directions (reverse rotation directions) at the boundary between the terminal portion and the upright portion and the boundary between the upright portion and the extending portion, respectively.
  • bending in different directions means that the metal sheet constituting the lead terminal (L) has a valley on one surface (the surface on the upper surface (T) side) of the metal sheet at the boundary between the terminal portion and the upright portion. It is bent, and means that the one side is bent so as to form a mountain at the boundary between the standing portion and the extending portion.
  • the extending portions of the two anchor portions may each bend from the upper end of the standing portion and extend in a direction away from each other.
  • the extending portions of the two anchor portions may each bend from the upper end of the upright portion and extend in a direction away from each other in a direction (D2) perpendicular to the direction in which the anode lead extends (D1). ..
  • the anchor portion of this configuration is easy to form. Further, when the anchor portion having this configuration is used, it is easy to fill the material of the exterior resin (mold resin or the like).
  • the two anchor portions may be bent in the same direction (same rotation direction) at the boundary between the terminal portion and the upright portion and the boundary between the upright portion and the extending portion, respectively.
  • each of the anode lead terminal and the cathode lead terminal may include two anchor portions. According to this configuration, an electrolytic capacitor having particularly high terminal strength and reliability can be obtained. Alternatively, only the anode lead terminal may include two anchor portions, or only the cathode lead terminal may include two anchor portions.
  • the anode lead terminal may be formed by processing one metal sheet by a known metal processing method.
  • the material of the anode lead terminal may be any material that can be used as the material of the anode lead terminal of the electrolytic capacitor.
  • a known material for the anode lead terminal used in the electrolytic capacitor may be used.
  • the anode lead terminal may be formed by processing a metal sheet (including a metal plate and a metal foil) made of a metal (copper, copper alloy, etc.).
  • the surface of the metal sheet may be plated with nickel plating, gold plating, or the like.
  • the thickness of the metal sheet constituting the anode lead terminal may be in the range of 25 ⁇ m to 200 ⁇ m (for example, in the range of 25 ⁇ m to 100 ⁇ m).
  • the anode lead terminal may include an anode terminal portion exposed on the bottom surface (B) and a wire connection portion (anode connection portion) rising from the anode terminal portion toward the top surface (T).
  • the two anchor portions may extend from the anode terminal portions (second A region and second B region).
  • the anode lead of the capacitor element is connected to the wire connection portion.
  • the wire connecting portion may have a wire receiving portion bent so as to be substantially parallel to the bottom surface (B) at its tip.
  • the wire receiving portion may be bent toward the front surface of the capacitor element, or may be bent in the opposite direction.
  • the front surface of the capacitor element is a surface facing the end surface of the capacitor element from which the wire protrudes.
  • the wire receiving portion enables reliable and easy connection between the wire connecting portion and the anode lead.
  • the cathode lead terminal may be formed by processing one metal sheet by a known metal processing method.
  • the material of the cathode lead terminal may be any material that can be used as the material of the cathode lead terminal of the electrolytic capacitor.
  • a known cathode lead terminal material used for an electrolytic capacitor may be used.
  • the cathode lead terminal may be formed of a metal sheet exemplified as the material of the anode lead terminal.
  • the cathode lead terminal may include a cathode terminal portion exposed on the bottom surface (B) and a connection 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 the connection portion.
  • two anchor portions may extend from the cathode terminal portion.
  • the capacitor element is not particularly limited.
  • As the capacitor element a capacitor element used in a known solid electrolytic capacitor or a capacitor element having a similar configuration may be used.
  • the electrolytic capacitor of the present disclosure may include a plurality of capacitor elements. In that case, the anode portions of the plurality of capacitors are electrically connected to the anode lead terminals.
  • An example capacitor element includes an anode part and a cathode part.
  • the anode portion includes an anode body having a dielectric layer formed on the surface thereof and an anode lead
  • the cathode portion includes an electrolyte layer and a cathode layer.
  • the electrolyte layer is arranged between the dielectric layer formed on the surface of the anode and the cathode layer.
  • the exterior resin is arranged around the capacitor element so that the capacitor element is not exposed on the surface of the electrolytic capacitor. Further, the exterior resin insulates the anode lead terminal and the cathode lead terminal.
  • a known exterior resin used for an electrolytic capacitor may be applied to the exterior resin.
  • the exterior resin may be formed by using an insulating resin material used for sealing the capacitor element. Examples of exterior resin materials include epoxy resins, phenolic resins, silicone resins, melamine resins, urea resins, alkyd resins, polyurethanes, polyimides, unsaturated polyesters and the like.
  • the exterior resin may contain a substance other than the resin (such as an inorganic filler).
  • FIG. 10 schematically shows a perspective view of the electrolytic capacitor 100 of the second embodiment.
  • a perspective view of the anode lead terminal 120 and the cathode lead terminal 130 of the electrolytic capacitor 100 shown in FIG. 10 is schematically shown in FIG.
  • FIG. 12 shows a cross-sectional view of the anchor portion of the anode lead terminal 120.
  • FIG. 13 shows a cross-sectional view of the anchor portion of the cathode lead terminal 130.
  • the position of the capacitor element 110 is shown by a dotted line.
  • the bottom view of the electrolytic capacitor 100 shown in FIG. 10 is schematically shown in FIG.
  • FIG. 14 the portion embedded in the exterior resin 101 is shown by a dotted line.
  • FIG. 14 the portion embedded in the exterior resin 101
  • FIG. 15 shows a side view schematically showing the electrolytic capacitor when the electrolytic capacitor (anode terminal side) shown in FIG. 10 is viewed from the direction (D1).
  • 16 is a side view of a main part schematically showing the electrolytic capacitor when the electrolytic capacitor (anode terminal side) shown in FIG. 10 is viewed from the direction (D2).
  • a cross-sectional view of the electrolytic capacitor 100 shown in FIG. 10 is schematically shown in FIG.
  • the cross-sectional view of FIG. 17 is a cross-sectional view that passes through the central axis of the anode lead (anode wire) 112.
  • some components may be shown only by contours in the following figures.
  • the exterior resin 101 is shown only by the outline represented by the dotted line.
  • the electrolytic capacitor 100 has a bottom surface 100b and a top surface 100t on the opposite side of 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 exterior resin 101.
  • the anode lead terminal 120 and the cathode lead terminal 130 are each electrically connected to the capacitor element 110.
  • the anode lead terminal 120 is made of a metal sheet and includes an anode terminal portion 121, a wire connecting portion 122, and two anchor portions 123.
  • the anode terminal 121 has a first main surface S1 and a second main surface S2 opposite to the first main surface S1, and the first main surface S1 is exposed on the bottom surface 100b. A part of the anode terminal portion 121 in the thickness direction is exposed on the bottom surface 100b.
  • the wire connecting portion 122 rises from the anode terminal portion 121 toward the upper surface 100t.
  • the groove portion of the wire connecting portion 122 for receiving the tip of the anode lead 112 is formed by resistance welding the anode lead 112 and the wire connecting portion 122.
  • the anode lead 112 and the wire connecting portion 122 may be connected by welding, soldering, or the like.
  • the anode terminal portion 121 has a central first region 121a and two second regions 121b (second A region and second B region) on both sides of the first region 121a.
  • the two second regions 121b each extend from the first region 121a and include a protrusion 125 whose tip protrudes from the end of the bottom surface 100b with respect to the direction (D1) in which the anode lead 112 extends. ..
  • the protrusion 125 of the two second regions 121b has a side surface S3 connected to the first main surface S1 and the second main surface S2, respectively.
  • the side surfaces S3 of the protrusions 125 of the two second regions 121b face each other and are inclined in different directions with respect to the first main surface S1 and the second main surface S2. That is, the side surfaces S3 of the two protrusions 125 are inclined in different directions from the first main surface S1 to the second main surface S2, respectively.
  • the side surface S3 of the protrusion 125 of the two second regions 121b is inclined so as to form an obtuse angle with the first main surface S1.
  • the side surface S3 is inclined so as to form an acute angle with the second main surface S2.
  • the inclination angle of the side surface S3 with respect to the first main surface S1 may be 100 ° or more and 135 ° or less, or 110 ° or more and 135 ° or less.
  • the above inclination angle is an angle formed by the main surface S1 and the side surface S3 when the electrolytic capacitor (anode terminal side) is viewed from the direction (D1).
  • the contour of the side surface S3 of the protrusion 125 shown in FIG. 15 is linear, but the contour may be curved such as an arc having a slight bulge.
  • the tip surfaces 125d of the two protrusions 125 may also be inclined so as to form an obtuse angle with the first main surface S1. In this case, a good solder fillet is likely to be formed, and the connection strength between the anode terminal portion and the substrate is enhanced.
  • the inclination angle of the tip surface 125d with respect to the first main surface S1 may be 100 ° or more and 135 ° or less, or 110 ° or more and 135 ° or less.
  • the two anchor portions 123 extend from the two end sides 121e, respectively.
  • the two end sides 121e are the ends of the anode terminal portion 121 (two second regions 121b), and are a pair of end sides along the direction D1 in which the anode lead 112 extends.
  • each of the two anchor portions 123 includes an upright portion 123a that rises from the end side 121e toward the upper surface 100t, and an extending portion 123b that bends and extends from the upper end of the upright portion 123a.
  • the two anchor portions 123 are bent in different directions at the boundary between the anode terminal portion 121 and the upright portion 123a and the boundary between the upright portion 123a and the extending portion 123b, respectively. There is.
  • one surface (the surface on the upper surface 100t side) of the metal sheet constituting the anode lead terminal 120 is valley-folded at the boundary between the anode terminal portion 121 and the upright portion 123a, and is formed with the upright portion 123a. It is a mountain fold at the boundary with the extending portion 123b.
  • the extending portion 123b extends from the upper end of the standing portion 123a toward the outside of the electrolytic capacitor 100. That is, each of the extending portions 123b of the two anchor portions 123 bends from the upper end of the upright portion 123a and extends in a direction away from each other in a direction (D2) perpendicular to the direction (D1) in which the anode lead 112 extends.
  • the direction in which the extending portion 123b extends is substantially parallel to the bottom surface 100b, and for example, the angle formed by the two may be in the range of ⁇ 20 ° to 20 °.
  • the cathode lead terminal 130 includes a cathode terminal portion 131, a connection portion 132, and two anchor portions 133.
  • the cathode terminal portion 131 is exposed on the bottom surface 100b.
  • the connection portion 132 is arranged so as to have a step with the cathode terminal portion 131.
  • the connecting portion 132 is electrically connected to the cathode portion 115 (cathode layer 117) described later via the 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 may be used.
  • the conductive member 141 may be formed of a metal paste or the like.
  • the two anchor portions 133 each extend from the two end sides 131e.
  • the two end sides 131e are the ends of the cathode terminal portion 131, and are a pair of end sides along the direction D1 in which the anode lead 112 extends.
  • the two anchor portions 133 each include an upright portion 133a that rises from the end side 131e toward the upper surface 100t, and an extension portion 133b that bends and extends from the upper end of the upright portion 133a.
  • the boundary between the cathode terminal portion 131 and the upright portion 133a and the boundary between the upright portion 133a and the extending portion 133b are bent in different directions. That is, each of the extending portions 133b of the two anchor portions 133 bends from the upper end of the upright portion 133a and extends in a direction away from each other in a direction (D2) perpendicular to the direction (D1) in which the anode lead 112 extends. There is.
  • the direction in which the extending portion 133b extends is substantially parallel to the bottom surface 100b, and for example, the angle formed by the two may be in the range of ⁇ 20 ° to 20 °.
  • the distance L1 from the surface of the anode terminal portion 121 to the lower surface of the extending portion 123b may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more).
  • the distance L1 By setting the distance L1 to 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more), it becomes easy to fill the lower portion of the extending portion 123b with the exterior resin 101.
  • the upper surface of the extending portion 123b is located below the lower surface of the capacitor element 110, but the extending portion 123b is located at a higher position unless the extending portion 123b interferes with the capacitor element 110. You may.
  • the distance L3 from the surface of the cathode terminal portion 131 to the lower surface of the extending portion 133b may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more), and may be in the range of 50 ⁇ m to 500 ⁇ m (for example, 75 ⁇ m). It may be in the range of ⁇ 200 ⁇ m).
  • the distance L4 from the upper surface of the extending portion 133b to the lower surface of the capacitor element 110 may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more), and is in the range of 50 ⁇ m to 500 ⁇ m (for example, the range of 75 ⁇ m to 200 ⁇ m). May be good.
  • the horizontal distance W1 (distance along the direction D2) from the end side 121e to the tip of the extending portion 123b and the horizontal distance W2 (distance along the direction D2) from the end side 131e to the tip of the extending portion 133b are Each may be 50 ⁇ m or more (for example, 75 ⁇ m or more or 100 ⁇ m or more).
  • the horizontal distances W1 and W2 may be set to 200 ⁇ m or more, respectively.
  • the shapes of the anode lead terminal 120 and the cathode lead terminal 130 described above are examples, and are not limited to the above shapes.
  • either the anode lead terminal 120 or the cathode lead terminal 130 may not include an anchor portion.
  • the connecting portion of the cathode lead terminal 130 may not be at the position shown in the figure or may not have the shape shown in the figure as long as it is electrically connected to the cathode portion 115 (cathode layer 117).
  • each of the two protrusions 125 may have a side surface S4 that is inclined so as to form an acute angle with the first main surface S1 instead of the side surface S3.
  • the side surface S4 is inclined so as to form an obtuse angle with the second main surface S2.
  • the inclination angle of the side surface S4 with respect to the first main surface S1 may be 45 ° or more and 80 ° or less, or 45 ° or more and 70 ° or less.
  • the contour of the side surface S4 shown in FIG. 18 is linear, but the contour may be curved such as an arc having a slight bulge.
  • 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 its surface, and an anode lead 112.
  • the cathode portion 115 includes an electrolyte layer 116 arranged so as 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 by using a metal paste.
  • 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.
  • the electrolytic capacitor 100 When the electrolytic capacitor 100 is mounted on a substrate or the like of an electronic device, it may be mounted by soldering the anode terminal portion 121 and the cathode terminal portion 131, respectively.
  • 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 the capacitor element 110 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.
  • the anode lead 112 and the anode lead terminal 120 are connected, and the cathode layer 117 and the cathode lead terminal 130 are connected.
  • the anode lead 112 and the anode lead terminal 120 can be connected by welding (for example, laser welding) or the like.
  • the cathode layer 117 and the cathode lead terminal 130 can be connected by, for example, the following method. First, a metal paste to be 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.
  • the cathode layer 117 and the connecting portion 132 are adhered to each other via the metal paste, and the metal paste is cured to form the conductive member 141. In this way, the cathode layer 117 and the cathode lead terminal 130 can be connected.
  • the capacitor element is sealed with the material of the exterior resin 101 (for example, mold resin).
  • the sealing step can be carried out by a known method.
  • the electrolytic capacitor 100 can be manufactured.
  • the other electrolytic capacitors disclosed in the present disclosure can also be manufactured by the same manufacturing method.
  • This disclosure can be used for electrolytic capacitors that require high reliability.
  • Electrolytic capacitor 100b Bottom surface 100t: Top surface 101: Exterior resin 110: Capacitor element 112: Anode lead 120: Anode lead terminal 121: Anode terminal portion 121a: First region 121b: Second region 121e, 131e: End side 121S, 131S: Main surface 123, 133: Anchor portion 124, 134, 154: Region 124S, 134S, 154S: Inclined surface 123a, 133a, 153a: Standing portion 123b, 133b: Extended portion 125: Protruding portion 125d: Tip surface 130: Cathode lead terminal 131: Cathode terminal portion 131e: End side 133a: Standing portion 133b: Extension portion S1: First main surface S2: Second main surface S3, S4: Side surface D1, D2: Direction

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  • Microelectronics & Electronic Packaging (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
PCT/JP2021/045457 2020-12-25 2021-12-10 電解コンデンサ Ceased WO2022138223A1 (ja)

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Publication number Priority date Publication date Assignee Title
US12148578B2 (en) * 2020-03-23 2024-11-19 Panasonic Intellectual Property Management Co., Ltd. Electrolytic capacitor

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