JP2009130155A - Solid electrolytic capacitor, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-state electrolytic capacitor and a manufacturing method thereof, capable of having a porous sintered body and an anode wire accurately positioned. <P>SOLUTION: Disclosed is the solid electrolytic capacitor A1 having the porous sintered body 1 made of valve action metal, the anode wire 11 projecting from the porous sintered body 1, and an anode mounting terminal 7a electrically conducted to the anode wire 11. The solid-state electrolytic capacitor further includes an anode conduction member 7 having a main portion 71 with one surface serving as the anode mounting terminal 7a; and a pair of extension portions 72 which extend from the same position of the main portion 71 in a direction wherein the anode wire 11 extends in mutually opposite directions crossing the direction where the anode wire 11 extends, and form a proximity portion 72a where a distance between the pair of extension portions 72 is made smaller than a diameter of the anode wire 11, the anode wire 11 being joined to the proximity portion 72a or a portion which is closer to the tip than the proximity portion 72a between the pair of extension portions 72. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solid electrolytic capacitor including a porous sintered body made of, for example, tantalum or niobium, and a method for manufacturing the same.

  13 and 14 show an example of a conventional solid electrolytic capacitor. The solid electrolytic capacitor X shown in the figure includes a porous sintered body 91 provided with an anode wire 91a, an anode conducting member 92, a cathode conducting member 93, and a sealing resin 94. The porous sintered body 91 is made of, for example, tantalum or niobium. A dielectric layer and a solid electrolyte layer (both not shown) are laminated on the porous sintered body 91. The anode conducting member 92 has a pair of extending portions 92b. The pair of extending portions 92b extend from different positions in the direction in which the anode wire 91a extends, and intersect each other. An anode wire 91a is joined to the intersecting portion of the pair of extending portions 92b by, for example, laser welding. The cathode conducting member 93 is conducted to the solid electrolyte layer. The sealing resin 94 is made of an insulating resin and covers the porous sintered body 91. The surfaces exposed from the sealing resin 94 of the anode conducting member 92 and the cathode conducting member 93 are used as an anode mounting terminal 92a and a cathode mounting terminal 93a for surface mounting the solid electrolytic capacitor X on a circuit board or the like.

  However, when joining the anode wire 91a to the pair of extending portions 92b in the manufacturing process of the solid electrolytic capacitor X, it is necessary to press the anode wire 91a against the pair of extending portions 92b. With this pressing force, the pair of extending portions 92b bend. Then, the position where the anode wire 91a is supported is shifted downward. Further, the reaction force generated by the bending of the pair of extending portions 92b acts on the anode wire 91a at different positions in the longitudinal direction. For this reason, the anode wire 91a and the porous sintered body 91 may be inclined. Thus, in the manufacturing process of the solid electrolytic capacitor X, there is a problem that the porous sintered body 91 and the anode wire 91a are easily displaced.

JP 2002-299165 A

  The present invention has been conceived under the above circumstances, and provides a solid electrolytic capacitor capable of accurately positioning a porous sintered body and an anode wire, and a method for manufacturing the same. Let it be an issue.

  The solid electrolytic capacitor provided by the first aspect of the present invention includes a porous sintered body made of a valve metal, an anode wire protruding from the porous sintered body, and an anode mounting terminal electrically connected to the anode wire. A main portion having one surface as the anode mounting terminal, and a direction intersecting the direction in which the anode wire extends from the same position in the direction in which the anode wire extends in the main portion. And a pair of extending portions that form proximate portions whose distance from each other is smaller than the diameter of the anode wire. The wire is bonded to a portion of the proximity portion or the pair of extending portions that is closer to the tip than the proximity portion.

  According to such a configuration, in the manufacturing process of the solid electrolytic capacitor, when the anode wire is joined to the pair of extension portions, the anode wire is connected to the proximity portion of the pair of extension portions. Or it becomes the appearance to catch at the part closer to the tip than this. Even if the anode wire is excessively pressed downward, the pair of extending portions will not be further deformed if there is no gap between the adjacent portions. Further, the reaction force generated in each of the extending portions when the anode wire is pressed acts on the anode wire without shifting in the longitudinal direction. Thereby, there is little possibility that the force which rotates the said anode wire and the said porous sintered compact will be loaded unjustly. Therefore, the anode wire and the porous sintered body can be accurately positioned. Furthermore, since the pair of extending portions are provided at the same position in the longitudinal direction of the anode wire, the size of the portion that supports the anode wire can be reduced.

  In a preferred embodiment of the present invention, the main portion has the pair of extending portions whose thickness is thinner than the thickness of the main portion, and the main portion and the pair of extending portions are The opposite side of the anode mounting terminal is connected so as to be flush with each other. According to such a configuration, the pair of extending portions formed in a folded shape is thin, which is suitable for reducing the height dimension of the pair of extending portions.

  In a preferred embodiment of the present invention, an end surface of the main portion that is opposite to the protruding end of the anode wire is an inclined surface that is separated from the protruding end of the anode wire as the distance from the anode mounting terminal increases. ing. According to such a configuration, the anode conducting member can be prevented from falling off, for example, from the sealing resin covering the anode conducting member.

  The method for manufacturing a solid electrolytic capacitor provided by the second aspect of the present invention includes a porous sintered body made of a valve metal, an anode wire protruding from the porous sintered body, and an electrical connection to the anode wire. A solid electrolytic capacitor manufacturing method comprising an anode mounting terminal, and a conductive material having a flat plate-shaped main portion and a pair of extending portions extending in opposite directions from the main portion. A step of bending the pair of extending portions so as to form a proximity portion by bringing a part of each other close to each other, and the tip of the proximity portion or the pair of extension portions closer to the tip than the proximity portion And a step of joining the anode wire having a diameter larger than a gap dimension of the proximity portion to a certain portion. According to such a configuration, the anode wire and the porous sintered body can be accurately positioned.

  In a preferred embodiment of the present invention, as the conductive material, the pair of extending portions is thinner than the main portion, and one side of the main portion and the pair of extending portions is a surface. Use one that is connected to be unity. According to such a configuration, it is possible to prevent the main part from being bent by mistake when bending the pair of extending parts. Since the pair of extending portions are flush with the main portion on the side where the pair of extending portions are bent, it is possible to prevent the base bent portions of the pair of extending portions from being excessively swollen. Moreover, there is little possibility that the bottom face shape of the main part will be extremely distorted by bending. This is advantageous for making the anode mounting terminal into a desired shape.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

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

  1 and 2 show a first embodiment of a solid electrolytic capacitor according to the present invention. The solid electrolytic capacitor A1 of this embodiment includes a porous sintered body 1, an anode wire 11, a dielectric layer 2, a solid electrolyte layer 3, a conductor layer 4, a conductive adhesive layer 5, a sealing resin 6, and an anode conducting member. 7 and a cathode conducting member 8. The solid electrolytic capacitor A1 is used for applications such as noise removal and power supply assistance in an electric circuit, for example. In FIG. 1, for convenience of understanding, the dielectric layer 2, the solid electrolyte layer 3, the conductor layer 4, and the conductive adhesive layer 5 are omitted, and the sealing resin 6 is indicated by an imaginary line.

  The porous sintered body 1 is made of a valve action metal such as niobium or tantalum and has a structure in which a large number of pores are formed. The porous sintered body 1 is manufactured by, for example, pressure-molding a fine powder of a valve action metal such as niobium or tantalum and then subjecting this compact to a sintering treatment. By this sintering treatment, fine powders of the valve action metal are sintered, and the porous sintered body 1 having a large number of pores is formed.

  The anode wire 11 is made of a valve metal such as niobium or tantalum and protrudes from the porous sintered body 1. The anode wire 11 is an integrated product in a state in which a part of the anode wire 11 is intruded into the fine powder when the fine powder of the valve action metal described above is pressed.

  The dielectric layer 2 is formed on the surface of the porous sintered body 1 and is made of an oxide of a valve action metal. The dielectric layer 2 covers the pores of the porous sintered body 1. The dielectric layer 2 is formed, for example, by subjecting the porous sintered body 1 to anodizing treatment in a state where the porous sintered body 1 is immersed in a chemical conversion solution of phosphoric acid aqueous solution.

  The solid electrolyte layer 3 is laminated on the dielectric layer 2 and is formed so as to fill the pores of the porous sintered body 1. The solid electrolyte layer 3 is made of, for example, manganese dioxide or a conductive polymer. When the solid electrolytic capacitor A1 is used, electric charges are stored at the interface between the solid electrolyte layer 3 and the dielectric layer 2.

  The conductor layer 4 has a structure in which, for example, a graphite layer and an Ag layer are stacked, and covers the solid electrolyte layer 3.

  The sealing resin 6 is made of, for example, an epoxy resin and is for protecting the porous sintered body 1. The resin package 6 is molded using, for example, an epoxy resin material.

  The anode conducting member 7 is made of, for example, a Ni-Fe alloy such as Cu-plated 42 alloy, and has a main portion 71 and a pair of extending portions 72. The main portion 71 has a substantially rectangular shape, and a part thereof is exposed from the sealing resin 6. The exposed surface of the main portion 71 serves as an anode mounting terminal 7a used for surface mounting the solid electrolytic capacitor A1 on a circuit board or the like. A portion closer to the porous sintered body 1 in the main portion 71 is a thin portion 73. The end surface of the thin portion 73 is an inclined surface 73a. The inclined surface 73a is inclined so as to be closer to the porous sintered body 1 as it is separated from the anode mounting terminal 7a.

  The pair of extending portions 72 extends from both sides of the main portion 71 and each has a strip shape. In the present embodiment, the pair of extending portions 72 is thinner than the portion of the main portion 71 where the pair of extending portions 72 are connected. The pair of extending portions 72 and the main portion 71 are flush with each other on the side opposite to the anode mounting terminal 7a. Each of the pair of extending portions 72 has a shape bent at two locations. A portion between the two bent portions of each extending portion 72 lies along the main portion 71. The bent portions near the tips of the pair of extending portions 72 are close to each other and constitute a proximity portion 72a. The gap of the proximity portion 72a is equal to or smaller than the diameter of the anode wire 11. The tip portions of the pair of extending portions 72 form a V shape. The anode wire 11 is joined to the V-shaped portion by, for example, laser welding.

  The cathode conducting member 8 is made of, for example, a Ni-Fe alloy such as 42 alloy plated with Cu, and is joined to the conductor layer 4 by the conductive adhesive layer 5. The surface of the cathode conducting member 8 exposed from the sealing resin 6 serves as a cathode mounting terminal 8a used for surface mounting the solid electrolytic capacitor A1 on a circuit board or the like.

  An example of each dimension of the solid electrolytic capacitor A1 is as follows. The overall dimensions of the solid electrolytic capacitor A1 are 1.0 mm in length, 0.5 mm in width, and 0.5 mm in height. The porous sintered body 1 has a length of 0.62 mm, a width of 0.45 mm, and a height of 0.315 mm. The diameter of the anode wire 11 is 0.11 mm. The main portion 71 has a thickness of 0.12 mm, and the pair of extending portions 72 has a thickness of 0.05 mm.

  Next, an example of a method for manufacturing the solid electrolytic capacitor A1 will be described below with reference to FIGS. In FIG. 8, for convenience of understanding, the dielectric layer 2, the solid electrolyte layer 3, the conductor layer 4, and the conductive adhesive layer 5 are omitted.

  First, as shown in FIGS. 3 and 4, a conductive material 7 'is prepared. The conductive material 7 ′ is formed by punching and pressing a plate made of a Ni—Fe alloy such as 42 alloy plated with Cu, or etching. The conductive material 7 ′ has a rectangular main part 71 and a pair of extending parts 72 in the form of strips extending on both sides of the main part 71. One side of the main portion 71 is a thin portion 73. The end surface of the thin portion 73 is an inclined surface 73a.

  Next, the conductive material 7 ′ is subjected to a plurality of bending processes. First, as shown in FIG. 5, the pair of extending portions 72 are erected using the mold M2. At this time, the mold M1 is pressed against the conductive material 7 '. Thereby, the front-end | tip of a pair of extension part 72 is bent a little outside. Next, as shown in FIG. 6, the pair of extending portions 72 erected using the mold M <b> 4 is tilted inward. At this time, by disposing the mold M3 between the pair of extending portions 72, the ends of the pair of extending portions 72 form a V shape having a relatively small angle. The closest part of the pair of extending parts 72 constitutes a proximity part 72a. And as shown in FIG. 7, the metal mold | die M5 is made to approach between the front-end | tips of a pair of extension part 72. As shown in FIG. As a result, the angle formed by the tips of the pair of extending portions 72 is slightly widened. The mold M6 is provided to prevent the entire pair of extending portions 72 from spreading. The anode conduction member 7 is obtained by the above bending process.

  Next, as shown in FIG. 8, the porous sintered body 1 is bonded to the cathode conducting member 8 by a conductive adhesive layer 5 (not shown). At this time, the anode wire 11 is positioned immediately above the proximity portion 72 a of the pair of extending portions 72. Then, the anode wire 11 is joined to the pair of extending portions 72 by, for example, laser welding. Thereafter, through the formation of the sealing resin 6 covering the porous sintered body 1, the solid electrolytic capacitor A1 shown in FIGS. 1 and 2 is obtained.

  Next, the operation of the solid electrolytic capacitor A1 and the manufacturing method thereof will be described.

  According to the present embodiment, when the anode wire 11 is joined to the pair of extending portions 72 in the manufacturing process of the solid electrolytic capacitor A1, the anode wire 11 is connected to the adjacent portion 72a of the pair of extending portions 72. It becomes the appearance to catch at the part closer to the tip than this. Even if the anode wire 11 is pressed excessively downward, the pair of extending portions 72 will not be further deformed if there is no gap between the proximity portions 72a. Further, the reaction force generated in each extending portion 72 when the anode wire 11 is pressed acts on the anode wire 11 without shifting in the longitudinal direction. Thereby, there is little possibility that the force which rotates the anode wire 11 and the porous sintered compact 1 will be improperly loaded. Therefore, the anode wire 11 and the porous sintered body 1 can be positioned accurately.

  Since the pair of extending portions 72 are thinner than the main portion 71, it is possible to prevent the main portion 71 from being bent by mistake when performing a bending process. Since the pair of extending portions 72 are flush with the main portion 71 on the side where the pair of extending portions 72 are bent, it is possible to prevent the root bent portions of the pair of extending portions 72 from being excessively swollen. Moreover, there is little possibility that the bottom face shape of the main part 71 will be extremely distorted by bending. This is advantageous for making the anode mounting terminal 7a into a desired shape.

  Since the pair of extending portions 72 are provided at the same position in the longitudinal direction of the anode wire 11, the portion supporting the anode wire 11 can be compared with the configuration according to the prior art shown in FIGS. 13 and 14, for example. The longitudinal dimension of the anode wire 11 can be reduced. In addition, the fact that the pair of extending portions 72 that are folded is thin is suitable for reducing the height dimension of the pair of extending portions 72. These are advantageous for minimizing the solid electrolytic capacitor A1 as in the example described above.

  If the thin-walled portion 73 is formed, it is possible to prevent the anode conducting member 7 and the conductor layer 4 from conducting unfairly. By providing the inclined surface 73a, it is possible to prevent the anode conducting member 7 from falling off the sealing resin 6.

  9 and 10 show another embodiment of the solid electrolytic capacitor according to the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.

  FIG. 9 shows a second embodiment of the solid electrolytic capacitor according to the present invention. The solid electrolytic capacitor A2 of the present embodiment is different from the above-described embodiment in the shape of the pair of extending portions 72. In the present embodiment, two proximity portions 72 a and 72 b are formed in the pair of extending portions 72. The proximity portion 72b is provided above the proximity portion 72a. A space that is the same as or slightly larger than the cross-sectional dimension of the anode wire 11 is formed between the adjacent portions 72a and 72b. The anode wire 11 is inserted into this space so as to be sandwiched between the proximity portions 72a and 72b.

  According to such an embodiment, in the manufacturing process of the solid electrolytic capacitor A2, when the anode wire 11 is pushed so as to push the proximity portion 72b, the anode wire 11 is fixed between the proximity portions 72a and 72b. This has an advantage that the positioning of the anode wire 11 is made accurate and a joining operation such as laser welding is facilitated.

  FIG. 10 shows a third embodiment of the solid electrolytic capacitor according to the present invention. The solid electrolytic capacitor A3 of the present embodiment is different from any of the above-described embodiments in the shape of the pair of extending portions 72. In the present embodiment, each extending portion 72 has a shape in which each root portion is twisted about 90 degrees. FIG. 11 shows a conducting material 7 ′ used for forming such an anode conducting member 7. The pair of extending portions 72 of the conductive material 7 ′ extend in parallel with each other from both sides of the main portion 71. Such a pair of extending portions 72 is subjected to a bending process as shown in FIG. That is, after raising the pair of extending portions 72, the respective root portions are twisted by about 90 degrees. And the proximity part 72a is formed by bending so that it may mutually approach.

  Also according to such an embodiment, positioning of anode wire 11 and porous sintered compact 1 can be performed correctly. Further, the conductive material 7 'has a relatively small size in plan view. This has the advantage that more conductive material 7 'can be obtained, for example, when a plurality of conductive materials 7' are taken from a certain plate.

  The solid electrolytic capacitor and the manufacturing method thereof according to the present invention are not limited to the embodiment described above. The specific configuration of each part of the solid electrolytic capacitor and the manufacturing method thereof according to the present invention can be varied in design in various ways.

  The pair of extending portions 72 is not limited to a band shape having a constant width, and may have various shapes. The pair of extending portions 72 is not limited to those whose base side portions lie along the main portion 71, and for example, the base portions may have a shape extending obliquely upward. The anode wire 11 may be joined to the pair of extending portions 72 so as to be sandwiched between the proximity portions 72a.

1 is an overall perspective view showing a first embodiment of a solid electrolytic capacitor according to the present invention. It is sectional drawing which follows the II-II line | wire of FIG. It is a perspective view which shows the conduction | electrical_connection material used for manufacture of the solid electrolytic capacitor shown in FIG. It is sectional drawing which follows the IV-IV line of FIG. FIG. 3 is a cross-sectional view of a main part showing a step of bending a conductive material in the example of the method for manufacturing the solid electrolytic capacitor shown in FIG. 1. FIG. 3 is a cross-sectional view of a main part showing a step of bending a conductive material in the example of the method for manufacturing the solid electrolytic capacitor shown in FIG. 1. FIG. 3 is a cross-sectional view of a main part showing a step of bending a conductive material in the example of the method for manufacturing the solid electrolytic capacitor shown in FIG. 1. FIG. 2 is a perspective view showing a step of joining a porous sintered body and an anode wire to an anode conducting member and a cathode conducting member in the example of the method for producing the solid electrolytic capacitor shown in FIG. 1. It is sectional drawing which shows 2nd Embodiment of the solid electrolytic capacitor which concerns on this invention. It is a whole perspective view which shows 3rd Embodiment of the solid electrolytic capacitor which concerns on this invention. It is a perspective view which shows the conduction | electrical_connection material used for manufacture of the solid electrolytic capacitor shown in FIG. It is a principal part perspective view which shows the process of bending a conduction | electrical_connection material in an example of the manufacturing method of the solid electrolytic capacitor shown in FIG. It is a principal part front view which shows an example of the conventional solid electrolytic capacitor. It is a principal part side view which shows an example of the conventional solid electrolytic capacitor.

Explanation of symbols

A1, A2, A3 Solid electrolytic capacitor 1 Porous sintered body 11 Anode wire 2 Dielectric layer 3 Solid electrolyte layer 4 Conductor layer 5 Conductive adhesive layer 6 Sealing resin 7 Anode conducting member 7 ′ Conducting material 7a Anode mounting terminal 8 Cathode conduction member 8a Cathode mounting terminal 71 Main part 72 Extension part 72a, 72b Proximity part 73 Thin part 73a Inclined surface

Claims (5)

A porous sintered body made of a valve metal,
An anode wire protruding from the porous sintered body;
An anode mounting terminal electrically connected to the anode wire;
A solid electrolytic capacitor comprising:
The main portion having one surface as the anode mounting terminal, and the main portion extending from the same position in the direction in which the anode wire extends from the same position in the direction intersecting with the direction in which the anode wire extends, and in the opposite direction. Further comprising an anode conducting member having a pair of extending portions that form a proximity portion that is smaller than the diameter of the anode wire,
The solid electrolytic capacitor, wherein the anode wire is joined to a portion of the proximity portion or the pair of extending portions closer to the tip than the proximity portion. The pair of extending portions has a thickness smaller than that of the main portion,
The solid electrolytic capacitor according to claim 1, wherein the main portion and the pair of extending portions are connected so that the opposite side to the anode mounting terminal is flush with the other.   The end face on the opposite side to the projecting end of the anode wire in the main portion is an inclined surface that is separated from the projecting end of the anode wire as it is separated from the anode mounting terminal. Solid electrolytic capacitor. A porous sintered body made of a valve metal,
An anode wire protruding from the porous sintered body;
An anode mounting terminal electrically connected to the anode wire;
A method for producing a solid electrolytic capacitor comprising:
The conductive material having a plate-like main portion and a pair of extending portions extending in opposite directions from the main portion so as to form a proximity portion by bringing a part of each other close to each other. Bending a pair of extending portions;
Bonding the anode wire having a diameter larger than a gap dimension of the proximity portion to a portion of the proximity portion or the pair of extending portions closer to the tip than the proximity portion; and
A method for producing a solid electrolytic capacitor, comprising:   As the conductive material, the pair of extending portions is thinner than the main portion, and one surface of the main portion and the pair of extending portions are connected so that they are flush with each other. The manufacturing method of the solid electrolytic capacitor of Claim 4 used.

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