JP2012033603A - Solid electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve manufacturing efficiency while reducing the ESR and/or ESL of a solid electrolytic capacitor with a capacitor element where anode leads are led out from a plurality of points on the outer peripheral surface of an anode body.SOLUTION: In the solid electrolytic capacitor, an anode terminal surface 30 is arranged while spaced apart from a cathode terminal surface 40 in a predetermined direction 91. In a capacitor element 1, first surface and second surface substantially facing each other are included in the outer peripheral surface of an anode body, and anode leads 12 are led out from both first and second surfaces. On an anode terminal 3 and a cathode terminal 4, the capacitor element 1 is mounted in such a position as two lead-out parts 121, 121 of the anode lead 12 are directed, respectively, in the direction substantially perpendicular to the predetermined direction 91 and in the reverse direction.

Description

  The present invention relates to a solid electrolytic capacitor including a lead type capacitor element.

  FIG. 19 is a cross-sectional view showing a conventional solid electrolytic capacitor. As shown in FIG. 19, the conventional solid electrolytic capacitor includes a lead type capacitor element (200), an anode terminal (260), and a cathode terminal (270), which are embedded in the exterior member (280). (For example, refer to Patent Document 1). Each of the anode terminal (260) and the cathode terminal (270) exposes a part of the surface on the lower surface (280a) of the exterior member (280), and thereby, on the lower surface (280a) of the exterior member (280), An anode terminal surface (261) and a cathode terminal surface (271) of the solid electrolytic capacitor are formed. The anode terminal surface (261) is spaced from the cathode terminal surface (271) in a predetermined direction (293).

  Here, the lead-type capacitor element (200) includes an anode sintered body (210) configured by planting anode leads (212) on a rectangular parallelepiped anode body (211), and the anode sintered body ( 210) a dielectric layer (220) formed on the outer peripheral surface, an electrolyte layer (230) formed on the dielectric layer (220), and a cathode layer formed on the electrolyte layer (230) (240). Specifically, the outer peripheral surface of the anode body (211) includes a first surface (211a) from which the anode lead (212) is drawn, and a second surface (211b) opposite to the first surface (211a). And a side surface (211c) extending from the outer peripheral edge of the first surface (211a) to the outer peripheral edge of the second surface (211b). The dielectric layer (220) includes the entire area of the outer peripheral surface of the anode body (211) (the first surface (211a), the second surface (211b), and the outer peripheral surface of the anode sintered body (210). (Side surface (211c)) and the base surface of the lead portion (212a) of the anode lead (212). The cathode layer (240) is formed on a region covering the second surface (211b) and the side surface (211c) of the anode body (211) in the electrolyte layer (230), and a carbon layer (not shown). And a silver paste layer (not shown) formed on the carbon layer.

  As shown in FIG. 19, in the conventional solid electrolytic capacitor, the capacitor element (200) is provided on the anode terminal (260) and the cathode terminal (270) with the lead-out portion (212a) of the anode lead (212). Mounted in a posture toward a predetermined direction (293), the lead portion (212a) of the anode lead (212) and the anode terminal (260) are electrically connected to each other via a conductive pillow member (262). On the other hand, a part of the cathode layer (240) and the cathode terminal (270) are electrically conductive adhesive (not shown) between the lower surface of the element body of the capacitor element (200) and the cathode terminal (270). Are electrically connected to each other. Here, the element body of the capacitor element (200) includes an anode body (211), a dielectric layer (220) formed on the anode body (211), an electrolyte layer (230), and a cathode layer (240). The cathode layer (240) is exposed on the outer peripheral surface of the element body.

JP 2008-91784 A

  Conventionally, the anode lead (212) of the capacitor element (200) has been drawn only from one place on the outer peripheral surface of the anode body (211). For this reason, the electrical resistance and / or inductance generated between the anode body (211) and the anode terminal surface (261) is large, and the ESR (equivalent series resistance) and / or ESL (equivalent series inductance) of the solid electrolytic capacitor is large. It was.

  Therefore, in the solid electrolytic capacitor, anode leads (212) are planted at two locations on the first surface (211a) of the anode body (211) of the capacitor element (200), and the first surface (211a) A configuration is conceivable in which each anode lead (212) is pulled out and the lead-out portion (212a) of the anode lead (212) is electrically connected to the anode terminal (260). According to this configuration, as the number of anode leads (212) increases, the electrical resistance and / or inductance generated between the anode body (211) and the anode terminal surface (261) is reduced, and the ESR and / or the solid electrolytic capacitor is reduced. Or ESL will be reduced. However, in the solid electrolytic capacitor, since it is necessary to plant two anode leads (212) and (212) with respect to the anode body (211), the manufacture of the capacitor element (200) is complicated.

  On the other hand, in recent years, in the capacitor element (200) shown in FIG. 19, not only the first surface (211a) of the anode body (211) but also the second surface (211b) of the anode body (211), anode leads (212) ) Is considered. According to this configuration, it is only necessary to pull out one anode lead (212) from both the first surface (211a) and the second surface (211b) of the anode body (211). Easy to manufacture. However, in the same manner as the conventional solid electrolytic capacitor, in this capacitor element (200), the lead portion (212a) of the anode lead (212) from the first surface (211a) is oriented in the predetermined direction (293). When mounted on the anode terminal (260) and the cathode terminal (270), the lead-out portion of the anode lead (212) from the second surface (211b) faces in a direction opposite to the predetermined direction (293). .

  For this reason, the distance between the lead portion and the anode terminal surface (261) is increased, and the lead portion and the anode terminal surface (261) are electrically connected by some connecting means having a large length. Therefore, the electrical resistance and / or inductance between the lead portion and the anode terminal surface (261) is increased by the electrical resistance and / or inductance of the connecting means. Therefore, in order to realize low ESR and / or low ESL of the solid electrolytic capacitor, the anode lead (212) is drawn from both the first surface (211a) and the second surface (211b) of the anode body (211). Nevertheless, if the conventional mounting posture of the capacitor element (200) in the solid electrolytic capacitor is adopted as it is, the ESR and / or ESL of the solid electrolytic capacitor is on the first surface (211a) of the anode body (211). As much as the configuration in which the anode lead (212) is drawn out from these two locations, the reduction is not significant.

  In the solid electrolytic capacitor, the distance between the lead portion of the anode lead (212) and the anode terminal surface (261) from the second surface (211b) is reduced by changing the shape of the anode terminal surface (261). However, it is necessary to change the shape of the anode terminal surface (261) from the conventional shape.

  Accordingly, an object of the present invention is to provide a solid electrolytic capacitor having a capacitor element in which anode leads are drawn out from a plurality of locations on the outer peripheral surface of the anode body, and to improve the production efficiency and lower the ESR of the solid electrolytic capacitor. It is to realize low ESL.

  The solid electrolytic capacitor according to the present invention includes a capacitor element having two anode portions and a cathode portion, and an exterior member that covers the capacitor element, and an anode terminal is electrically connected to the two anode portions of the capacitor element. The anode terminal surface is formed on the lower surface of the exterior member by exposing a part of the surface of the anode terminal to the lower surface of the exterior member, while the cathode terminal is electrically connected to the cathode portion of the capacitor element. The cathode terminal surface is formed on the lower surface of the exterior member by exposing a part of the surface of the cathode terminal to the lower surface of the exterior member, and the anode terminal surface is separated from the cathode terminal surface in a predetermined direction. Are arranged. Here, the capacitor element includes an anode body and an anode lead planted on the anode body, and the outer peripheral surface of the anode body includes a first surface and a second surface that are substantially opposed to each other, The anode lead is drawn out from both the first surface and the second surface, a dielectric layer is formed on at least a part of the outer peripheral surface of the anode body, and an electrolyte layer is formed on the dielectric layer, A cathode layer is formed on the electrolyte layer, and the two anode portions are constituted by two lead portions drawn from both the first surface and the second surface of the anode body in the anode lead, The cathode part is constituted by the cathode layer. On the anode terminal and the cathode terminal, the capacitor element is mounted in such a posture that the two lead portions of the anode lead are oriented in a direction substantially perpendicular to the predetermined direction and in a direction opposite thereto. Yes.

  In the solid electrolytic capacitor, the distance between the two lead portions of the anode lead and the anode terminal surface can be made substantially the same without changing the shape of the anode terminal surface from the conventional shape. Accordingly, the distance is almost the same as the distance between the lead portion of the anode lead and the anode terminal surface of the conventional solid electrolytic capacitor in which the anode lead is drawn only from one place on the surface of the anode body. Similarly, by mounting the capacitor element on the anode terminal and the cathode terminal, the electrical resistance and / or inductance generated between the anode body and the anode terminal surface is reduced by the increase in the number of lead-out portions of the anode lead. As a result, low ESR and / or low ESL of the solid electrolytic capacitor is realized.

  In the specific configuration of the solid electrolytic capacitor, an electrical connection portion extending in an inverted L shape from the anode terminal and electrically connecting the anode terminal and each lead portion of the anode lead is connected to the exterior member. Is provided.

  In the above specific configuration, the height dimension of each electrical connection portion can be changed according to the height position of the lead portion of the anode lead from the upper surface of the anode terminal. Therefore, by adjusting the height dimension of each electrical connection portion according to the height position of the lead portion of the anode lead from the upper surface of the anode terminal, the tip end portion of the electrical connection portion is adjusted to the corresponding anode lead. The drawer part can be brought into contact with certainty. Therefore, according to the specific configuration, the electrical connection between the anode terminal and each lead portion of the anode lead is good.

  In a more specific configuration of the solid electrolytic capacitor, the electrical connection portion extends in an inverted L shape from two locations on the cathode terminal surface side of the outer peripheral edge of the anode terminal surface. It is formed by bending and deforming a part of the anode terminal in an inverted L shape.

  According to the specific configuration, each electrical connection portion can be easily formed by bending the anode terminal. Moreover, the height dimension of the electrical connection portion can be easily changed by simply changing the bending position of the anode terminal.

  In another specific configuration of the solid electrolytic capacitor, the capacitor element is drawn from both the first surface and the second surface of the anode body by passing one anode lead through the anode body. It is.

  According to the above specific configuration, it is only necessary to pull out one anode lead from both the first surface and the second surface of the anode body, so that the capacitor element can be easily manufactured. Therefore, it becomes possible to manufacture a solid electrolytic capacitor efficiently.

  According to the solid electrolytic capacitor according to the present invention, it is possible to realize the production efficiency and the low ESR and / or low ESL of the solid electrolytic capacitor.

FIG. 1 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA shown in FIG. FIG. 3 is a cross-sectional view taken along line BB shown in FIG. FIG. 4 is a top view of the solid electrolytic capacitor. FIG. 5 is a side view of the solid electrolytic capacitor as viewed from the extending direction of the anode lead provided in the capacitor element. FIG. 6 is a side view of the solid electrolytic capacitor as viewed from a direction perpendicular to the extending direction of the anode lead provided in the capacitor element. FIG. 7: is a perspective view used for description of the 1st process of the element preparation process about the manufacturing method of the said solid electrolytic capacitor. FIG. 8 is a side view used for explaining the mounting step in the second step of the device manufacturing step. FIG. 9 is a diagram used for explaining the step of forming the dielectric layer of the capacitor element in the second step of the element manufacturing process. FIG. 10 is a diagram used for explaining the step of forming the electrolyte layer of the capacitor element in the second step of the element manufacturing process. FIG. 11A to FIG. 11D are diagrams used for explaining a process of forming the cathode layer of the capacitor element in the second process of the element manufacturing process. FIG. 12 is a plan view of the anode structure as viewed from the extending direction of the lead base material. FIG. 13A and FIG. 13B are perspective views used for explaining the third step of the element manufacturing step. FIG. 14 is a perspective view used for explaining the terminal manufacturing process and the element mounting process in the method for manufacturing the solid electrolytic capacitor. FIG. 15A and FIG. 15B are diagrams used for explaining a modification of the step of forming the cathode layer of the capacitor element in the second step of the element manufacturing step. FIG. 16 is a plan view of an example of the anode structure as viewed from the extending direction of the lead base material. FIG. 17 is a plan view of another example of the anode structure as viewed from the extending direction of the lead base material. FIG. 18 is a plan view showing various distances from the central axis of the lead base material. FIG. 19 is a cross-sectional view showing a conventional solid electrolytic capacitor.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a perspective view showing a solid electrolytic capacitor according to an embodiment of the present invention. As shown in FIG. 1, the solid electrolytic capacitor includes a solid electrolytic capacitor element (1), an exterior member (2) covering the capacitor element (1), an anode terminal (3), and a cathode terminal ( 4). The exterior member (2) is made of a resin such as an epoxy resin.

  2 and 3 are sectional views taken along lines AA and BB shown in FIG. 1, respectively. As shown in FIGS. 2 and 3, the capacitor element (1) includes a rectangular parallelepiped anode body (11) and a cylindrical anode lead (12) planted on the anode body (11). Yes. Here, the outer peripheral surface of the anode body (11) includes the first surface (11a) and the second surface (11b) that are substantially opposite to each other, and the outer periphery of the first surface (11a) to the outside of the second surface (11b). The anode lead (12) is drawn from both the first surface (11a) and the second surface (11b) of the anode body (11). Specifically, the anode lead (12) is a single metal wire having a central portion (122) embedded in the anode body (11), and the first surface (11a) of the anode body (11). And two lead portions (121) and (121) drawn out from the anode body (11) from both sides of the second surface (11b). Thus, the anode lead (12) passes through the anode body (11) and is drawn out from both the first surface (11a) and the second surface (11b) of the anode body (11).

  The anode body (11) is composed of a porous sintered body made of a valve action metal, while the anode lead (12) is the same or different from the valve action metal constituting the anode body (11). The anode body (11) and the anode lead (12) are electrically connected to each other. As the valve metal constituting the anode body (11) and the anode lead (12), for example, a metal such as tantalum, niobium, titanium, or aluminum is used.

  2 and 3, the capacitor element (1) is further formed on the dielectric layer (13) formed on the outer peripheral surface of the anode body (11) and on the dielectric layer (13). An electrolyte layer (14), and a cathode layer (15) formed on the electrolyte layer (14).

  The dielectric layer (13) includes an oxide film formed on the outer peripheral surface of the anode body (11) and an oxide film formed on the base surface of the two lead portions (121) and (121) of the anode lead (12). It consists of and. Therefore, the front end portion of each lead-out portion (121) of the anode lead (12) is exposed without being covered with the dielectric layer (13). Here, these oxide films constituting the dielectric layer (13) are formed from an anode body (10) composed of an anode body (11) and an anode lead (12) by electrolysis such as a phosphoric acid aqueous solution or an adipic acid aqueous solution. It is formed by dipping in a solution and electrochemically oxidizing the outer peripheral surface of the anode structure (10) (anodic oxidation). The details of the method of forming the dielectric layer (13) will be described later.

  The electrolyte layer (14) is an electrolyte material that can be solidified on the dielectric layer (13), for example, a conductive inorganic material such as manganese dioxide, or a conductive material such as a TCNQ (Tetracyano-quinodimethane) complex salt or a conductive polymer. It is formed using an organic material. The details of the method of forming the electrolyte layer (14) will be described later.

  As shown in FIG. 3 (see also FIG. 1), on the outer peripheral surface of the anode body (11), a belt-shaped predetermined region R0 surrounding the anode body (11) including the lead-out position of the anode lead (12) is set. Has been. Specifically, the predetermined region R0 is a band-like region extending along the first surface (11a) and the second surface (11b) of the anode body (11), and further along the upper surface and the lower surface of the anode body (11). It is. A first region R1 located above the predetermined region R0 and a second region R2 different from the first region R1 exist on the outer peripheral surface of the electrolyte layer (14).

  The cathode layer (15) is not formed on the first region R1 of the electrolyte layer (14), but is formed on the second region R2 of the electrolyte layer (14). Here, the cathode layer (15) includes a carbon layer (not shown) formed on the second region R2 of the electrolyte layer (14) and a silver paste layer (not shown) formed on the carbon layer. It consists of and. The electrolyte layer (14) and the cathode layer (15) are electrically connected to each other. The details of the method of forming the cathode layer (15) will be described later.

  In the capacitor element (1), the two lead portions (121) and (121) of the anode lead (12) constitute two anode portions of the capacitor element (1), while the cathode layer (15) constitutes a capacitor. The cathode portion of the element (1) is configured, and a dielectric layer (13) and an electrolyte layer (14) are interposed between the two anode portions and the cathode portion. The capacitor element (1) includes an anode body (11) and a dielectric layer (13), an electrolyte layer (14), and a cathode layer (15) formed on the anode body (11). The element body of the capacitor element (1) is constructed, and the cathode layer (15) is exposed on the outer peripheral surface of the element body, while the anode lead (12) is drawn out from two locations on the outer peripheral surface of the element body. ing. Hereinafter, the surface from which the anode lead (12) is drawn out of the outer peripheral surface of the element body is referred to as a first lead surface (1a) and a second lead surface (1b) of the capacitor element (1), respectively.

  As shown in FIG. 3, the anode terminal (3) and the cathode terminal (4) are embedded in the exterior member (2). Then, by exposing a part of the surface of the anode terminal (3) to the lower surface (2a) of the exterior member (2), the anode terminal surface (30) is formed on the lower surface (2a) of the exterior member (2). On the other hand, the cathode terminal surface (40) is formed on the lower surface (2a) of the exterior member (2) by exposing a part of the surface of the cathode terminal (4) to the lower surface (2a) of the exterior member (2). The anode terminal surface (30) is spaced from the cathode terminal surface (40) in a predetermined direction (91).

  FIG. 4 is a top view of the solid electrolytic capacitor. FIGS. 5 and 6 are side views of the solid electrolytic capacitor as viewed from the direction in which the anode lead 12 extends and the direction perpendicular thereto. As shown in FIG. 4, on the anode terminal (3) and the cathode terminal (4), the capacitor element (1) has two lead-out portions (121) and (121) of the anode lead (12) respectively. It is mounted in a posture oriented in a direction substantially perpendicular to the direction (91) and in the opposite direction.

  Here, as shown in FIG. 1 and FIG. 5, in the exterior member (2), there are two first ones that are connected to the anode terminal (3) and extend in an inverted L shape from the anode terminal (3). Electrical connections (31) (31) are provided. Specifically, of the two first electrical connection portions (31) and (31), one first electrical connection portion (31) has an anode terminal on the first lead surface (1a) side of the capacitor element (1). (3) extends in an inverted L shape, and the other first electrical connection portion (31) extends in an inverted L shape from the anode terminal (3) on the second lead surface (1b) side of the capacitor element (1). ing. Each first electrical connection portion (31) has a posture in which the tip end portion (310) is directed in a direction opposite to the predetermined direction (91).

  In the present embodiment, the first electrical connecting portions (31), (31) extend in an inverted L shape from two locations on the cathode terminal surface (40) side of the outer peripheral edge of the anode terminal surface (30). Each first electrical connection portion (31) is formed by bending and deforming a part of the anode terminal (3) in an inverted L shape.

  As shown in FIGS. 2 and 6, the tip end portion (310) of each first electrical connection portion (31) and the lead portion (121) of the anode lead (12) weld these joint surfaces. Thus, they are electrically connected to each other through the joint portion (32) formed thereby. Thus, each lead part (121) of the anode lead (12) and the anode terminal (3) are connected to the first electrical connection part (31) and the joint part (32) corresponding to the lead part (121). Are electrically connected to each other.

  As shown in FIGS. 1 and 5, the exterior member (2) is further provided with a second electrical connection portion (continuous to the cathode terminal (4) and extending in an inverted L shape from the cathode terminal (4)). 41) is provided. Specifically, the second electrical connection portion (41) extends in an inverted L shape from the cathode terminal (4) on the lower surface (1c) side of the element body of the capacitor element (1), and the second electrical connection portion. The front end (410) of (41) is oriented in the predetermined direction (91).

  In the present embodiment, the second electrical connection portion (41) extends in an inverted L shape from one location on the anode terminal surface (30) side of the outer peripheral edge of the cathode terminal surface (40), The electrical connection portion (41) is formed by bending and deforming a part of the cathode terminal (4) in an inverted L shape.

  As shown in FIGS. 2 and 3, a conductive adhesive (42) is interposed between the lower surface (1c) of the element body of the capacitor element (1) and the second electrical connection part (41). Thus, a part of the cathode layer (15) of the capacitor element (1) and the second electrical connection portion (41) are electrically connected to each other via the conductive adhesive (42). Thus, the cathode layer (15) and the cathode terminal (4) of the capacitor element (1) are electrically connected to each other via the second electrical connection portion (41) and the conductive adhesive (42). ing.

  Here, as shown in FIG. 3, the cathode layer (15) is not formed in the first region R1 on the outer peripheral surface of the electrolyte layer (14). Accordingly, the first region R1 of the electrolyte layer (14) is exposed on the lower surface (1c) of the element body of the capacitor element (1). On the other hand, the conductive adhesive (42) is interposed between the lower surface (1c) of the element body of the capacitor element (1) and the second electrical connection part (41), so that the electrolyte layer (14) can A conductive adhesive (42) is also interposed between the one region R1 and the second electrical connection (41). Therefore, a part of the conductive adhesive (42) covers the first region R1 of the electrolyte layer (14) and functions as the cathode layer (15) of the capacitor element (1). The electrical connection area between (1) and the cathode terminal (4) is increasing.

  Next, the manufacturing method of the said solid electrolytic capacitor is concretely demonstrated along drawing. In the manufacturing method, an element manufacturing process, a terminal manufacturing process, an element mounting process, and an exterior forming process are sequentially performed.

The element manufacturing process is a process of manufacturing the capacitor element (1). In the element manufacturing process, the first process, the second process, and the third process are sequentially performed.
FIG. 7 is a perspective view used for explaining the first step of the element manufacturing step. As shown in FIG. 7, in the first step of the device manufacturing process, an anode structure (5) to be a plurality of anode structures (10) to (10) is manufactured. Here, the anode structure (5) is composed of a lead substrate (50) to be a plurality of anode leads (12) to (12) and a plurality of anode bodies (11) to (11). The anode body (11) is formed in a plurality of locations of the lead base material (50) with both the first surface (11a) and the second surface (11b) being penetrated by the lead base material (50). Yes.

  Specifically, in the first step, first, a metal powder is filled into a mold, and the metal powder is pressed and hardened to form a powder molded body to be an anode body (11). Form in place. Here, each powder compact has a state of being penetrated by the lead base material (50). Next, together with the lead substrate (50), a plurality of powder molded bodies formed on the lead substrate (50) are fired to sinter each powder molded body to form the anode body (11). . Thereby, the anode structure (5) is completed.

  In addition, the lead base material (50) used in the first step has a position where the anode body (11) is formed on the first surface (11a) and the second surface of the anode body (11) in the capacitor element (1). The length is set according to the length of the lead portions (121) and (121) of the anode lead (12) to be drawn from both surfaces of the surface (11b). In the first step, the anode body (11) is formed at each formation position set on the lead substrate (50).

  Specifically, as shown in FIG. 7, the length d of the lead base material (50) between two adjacent anode bodies (11) (11) is the anode lead (12) of the capacitor element (1). From the sum of the lengths of the two lead portions (121) and (121), the cutting allowance required in the third step (see FIGS. 13 (a) and 13 (b)) of the device manufacturing step described later is obtained. It is set longer by minutes.

In the second step of the device manufacturing step, the mounting step, the step of forming the dielectric layer (13) of the capacitor element (1), the step of forming the electrolyte layer (14) of the capacitor element (1), and the capacitor element ( The process of forming the cathode layer (15) of 1) is performed in order.
FIG. 8 is a side view used for explaining the mounting step in the second step of the device manufacturing step. As shown in FIG. 8, in the attachment process, a carrier bar (6) having conductivity is prepared, the anode structure (5) is provided on the carrier bar (6), and the lead substrate of the anode structure (5). The mounting direction (92) of (50) is attached so as to be substantially parallel to the extending direction (93) of the carrier bar (6). At this time, both end portions of the lead base material (50) are fixed to the carrier bar (6).

  FIG. 9 and FIG. 10 are diagrams used for explaining the step of forming the dielectric layer (13) and the electrolyte layer (14) of the capacitor element (1) in the second step of the device manufacturing step. As shown in FIG. 9, in the step of forming the dielectric layer (13), a treatment tank (71) filled with an electrolytic solution (701) such as a phosphoric acid aqueous solution or an adipic acid aqueous solution is prepared. Here, a cathode plate (710) is provided in the electrolytic solution (701). Thereafter, the carrier bar (6) is operated to immerse the anode structure (5) in the electrolytic solution (701). A voltage V is applied between the carrier bar (6) and the cathode plate (710). Thereby, the outer peripheral surface of the anode structure (5) is electrochemically oxidized (anodized), and as a result, a dielectric layer (13) is formed on the outer peripheral surface of the anode structure (5).

  Next, in the step of forming the electrolyte layer (14), a conductive precoat layer (not shown) is formed on the dielectric layer (13). Here, the precoat layer is composed of a conductive material such as a conductive polymer using a chemical polymerization method.

  In the step of forming the electrolyte layer (14), as shown in FIG. 10, a treatment tank (72) filled with an electrolytic polymerization solution (702) made of a conductive organic material such as a conductive polymer is prepared. Here, a cathode plate (720) is provided in the electrolytic polymerization solution (702). Thereafter, the carrier bar (6) is operated to immerse the anode structure (5) in the electrolytic polymerization solution (702). Then, in the electrolytic polymerization solution (702), the external electrode (61) is brought into electrical contact with the precoat layer on each anode body (11), and between the external electrode (61) and the cathode plate (720). A constant current is passed through the precoat layer by applying a voltage V to the precoat layer. Thereby, an electrolytic polymer film is formed on the precoat layer, and as a result, an electrolyte layer (14) constituted by the precoat layer and the electrolytic polymer film on the precoat layer is formed on the dielectric layer (13). It is formed. Then, after the electrolyte layer (14) is formed, the anode structure (5) is removed from the carrier bar (6).

  FIG. 11A to FIG. 11D are diagrams used for explaining a process of forming the cathode layer (15) of the capacitor element (1) in the second process of the element manufacturing process. As shown in FIG. 11A, in this step, first, a treatment tank (73) filled with a carbon paste (703) is prepared. Then, the anode structure (5) is arranged in such a posture that the extending direction (92) of the lead base material (50) is substantially parallel to the liquid surface (703a) of the carbon paste (703). At this time, the anode structure (5) is installed in a rotating device (8) capable of rotating the lead base material (50) around its central axis. Thereafter, as shown in FIG. 11 (b), the treatment tank (73) is raised, and the end portion on one side of each anode body (11) without immersing the lead base material (50) in the carbon paste (703). (111) is immersed in the carbon paste (703).

  Next, as shown in FIG. 11 (c), after the processing tank (73) is lowered, the rotating device (8) is driven while maintaining the posture of the anode structure (5), and the lead substrate is moved. The material (50) is rotated about 180 ° about its central axis. Thereafter, as shown in FIG. 11 (d), the treatment tank (73) is raised, and the other end of each anode body (11) is not immersed in the carbon paste (703) with the lead base material (50). (112) is immersed in the carbon paste (703).

  Accordingly, as shown in FIG. 12, each anode body (11) of the anode structure (5) has a predetermined region on the outer peripheral surface of the electrolyte layer (14) (that is, the second region R2 shown in FIG. 3). The carbon layer (151) is formed on the outer peripheral surface of the electrolyte layer (14), and a band-shaped first region R1 without the carbon layer (151) is formed. Here, both edges of the first region R1 are parallel to each other and extend linearly. Further, the carbon layer (151) is not formed on the lead substrate (50).

  After the formation of the carbon layer (151), a treatment tank (74) filled with the silver paste (704) is prepared (see FIG. 11 (a)). Thereafter, the same operation as the formation of the carbon layer (151) described above is performed. As a result, a silver paste layer (152) is formed on the carbon layer (151) of the anode structure (5). As a result, a predetermined region on the outer peripheral surface of the electrolyte layer (14) (ie, as shown in FIG. 3). A cathode layer (15) is formed in the second region R2) (see FIG. 12).

  FIGS. 13A and 13B are perspective views used for explaining the third step of the device manufacturing process. As shown in FIG. 13A, in the third step of the element manufacturing process, the lead base material (50) is cut into a plurality of predetermined positions P to P by cutting the lead base material (50). And cut. As a result, as shown in FIG. 13B, a plurality of anode leads (12) to (12) are formed from the lead base material (50), and the anode bodies (11) and (11) are separated from each other. Thus, a plurality of capacitor element bodies (51) to (51) having two lead portions (121) and (121) are manufactured.

  In each capacitor element body (51), a dielectric layer (13) and an electrolyte layer (14) are formed on the outer peripheral surface (excluding the cut surface) of the two lead portions (121) and (121). It is up to. Therefore, after the third step is performed, the two lead portions (121) and (121) of the anode lead (12) of each capacitor element body (51) are subjected to laser peeling to thereby provide each lead portion (121). The surface of the tip of) is exposed. Thereby, the capacitor | condenser element (1) shown by FIGS. 1-3 is completed.

  FIG. 14 is a perspective view used for explaining the terminal manufacturing process and the element mounting process. As shown in FIG. 14, in the terminal manufacturing process, the anode terminal (3) and the first metal plate (52) to be the two first electric connection portions (31) (31) are bent. . Specifically, the first metal plate (52) includes a first flat plate portion (521) that becomes the anode terminal (3) and two second flat plate portions (first and second electric connection portions (31) and (31)). 522) and 522, and the second flat plate portion (522) is bent and deformed in an inverted L shape with respect to the first flat plate portion (521) by bending. Thus, the anode terminal (3) is formed from the first flat plate portion (521) of the first metal plate (52), and the first electric plate is formed from each second flat plate portion (522) of the first metal plate (52). A connection part (31) is formed.

  In the terminal manufacturing process, the second metal plate (53) to be the cathode terminal (4) and the second electrical connection portion (41) is further bent. Specifically, the second metal plate (53) has a first flat plate portion (531) serving as the cathode terminal (4) and a second flat plate portion (532) serving as the second electrical connection portion (41). The second flat plate portion (532) is bent and deformed in an inverted L shape with respect to the first flat plate portion (531) by bending. Thus, a cathode terminal (4) is formed from the first flat plate portion (531) of the second metal plate (53), and a second electrical connection is formed from the second flat plate portion (532) of the second metal plate (53). A part (41) is formed.

  Next, in the element mounting process, as shown in FIG. 14, capacitor elements are mounted on the anode terminal (3) and the cathode terminal (4). Here, the anode terminal (3) is disposed at a position separated from the cathode terminal (4) in a predetermined direction (91), and the second electrical connection portion (41) has two first electrical connection portions (31). It is arranged to be located between (31). In the element mounting process, the capacitor element (1) and the two lead portions (121) and (121) of the anode lead (12) are arranged in a direction substantially perpendicular to the predetermined direction (91) and opposite thereto. It is mounted with the posture toward the direction of. At this time, a conductive adhesive (42) is interposed between the lower surface (1c) of the element body of the capacitor element (1) and the second electrical connection part (41) (see FIGS. 2 and 3). Thereby, the cathode layer (15) and the cathode terminal (4) of the capacitor element (1) are electrically connected to each other via the second electrical connection portion (41) and the conductive adhesive (42). It will be. Further, the conductive adhesive (42) is also interposed between the first region R1 of the electrolyte layer (14) and the second electrical connection portion (41) (see FIG. 3). Therefore, a part of the conductive adhesive (42) covers the first region R1 of the electrolyte layer (14) and functions as the cathode layer (15) of the capacitor element (1).

  According to the above posture of the capacitor element (1), the lead portion (121) of the anode lead (12) corresponding to each first electrical connection portion (31) comes into contact (see FIG. 6). . In the element mounting step, welding is further performed on the contact surface between each lead portion (121) of the anode lead (12) and the first electrical connection portion (31). As a result, a joining portion (32) for electrically joining the anode lead (12) and the first electrical connection portion (31) to each other is formed on the contact surface (see FIG. 2). As a result, the anode lead ( 12) Each drawer part (121) and anode terminal (3) are electrically connected to each other via a first electrical connection part (31) and a joint part (32) corresponding to the drawer part (121). Will be.

  After the element mounting step, the capacitor element (1) is covered with the exterior member (2) as shown in FIGS. 1 to 3 by using a molding technique in the exterior formation step. Here, a resin such as an epoxy resin is used as the material of the exterior member.

  In the element manufacturing process of the above manufacturing method, a plurality of capacitor elements (1) to (1) are formed by separating the anode bodies (11) and (11) in the third process until the third process is executed. Can handle a plurality of anode structures (10) to (10) by an anode structure (5) which is an integral structure. Therefore, a plurality of anode structures (10) to (10) can be handled together without an auxiliary tool such as a carrier bar. Therefore, according to the above-described element manufacturing process, compared to the conventional method of manufacturing a capacitor element, that is, compared to a form in which an auxiliary tool such as a carrier bar is always necessary to handle a plurality of anode structures together. The element (1) can be efficiently manufactured.

  Moreover, in the element manufacturing process of the above manufacturing method, the anode structure is attached to the carrier bar (6) only by fixing both ends of the lead base material (50) to the carrier bar (6) in the second mounting process. (5) can be attached. Therefore, according to the element manufacturing process, the capacitor element (1) is more efficient than the conventional method of manufacturing a capacitor element, that is, a mode in which a plurality of anode structures must be attached to the carrier bar one by one. Can be manufactured.

  Furthermore, according to the element manufacturing step of the manufacturing method, in the step of forming the cathode layer (15), the cathode layer (15) is not formed on the outer peripheral surface of the lead base material (50). Therefore, in the manufactured capacitor element (1), the cathode layer (15) is not formed on the outer peripheral surfaces of the two lead portions (121) and (121) of the anode lead (12). Therefore, in the manufacturing process of the solid electrolytic capacitor, even when the lead part (121) of the anode lead (12) of the capacitor element (1) is subjected to processing such as laser peeling, the anode lead (12) and the cathode layer (15 ) Are not electrically short-circuited, and therefore the occurrence of a short circuit is reduced.

  In addition, according to the above-described step of forming the cathode layer (15), the cathode layer (15) can be formed on both the first surface (11a) and the second surface (11b) of the anode body (11). is there. Therefore, in the manufactured capacitor element (1), a cathode layer is formed on the conventional capacitor element (see FIG. 19), that is, on the surface of the anode body from which the anode lead is drawn. Compared to a configuration without this, it is easy to achieve low ESR.

  In the solid electrolytic capacitor, the cathode layer (15) is not formed in the first region R1 on the outer peripheral surface of the electrolyte layer (14). Accordingly, the first region R1 of the electrolyte layer (14) is exposed on the lower surface (1c) of the element body of the capacitor element (1). On the other hand, in the solid electrolytic capacitor, a conductive adhesive (42) is interposed between the first region R1 of the electrolyte layer (14) and the second electrical connection portion (41), thereby making the conductive layer conductive. A part of the adhesive (42) covers the first region R1 of the electrolyte layer (14) and functions as the cathode layer (15) of the capacitor element (1). Therefore, the electrical connection area between the capacitor element (1) and the cathode terminal (4) is increased, thereby further reducing the ESR in the solid electrolytic capacitor.

  Furthermore, in the element manufacturing process of the above manufacturing method, the length d of the lead base material 50 between two adjacent anode bodies 11 and 11 is determined by the anode lead 12 of the capacitor element 1. ) Of the two lead portions (121) and (121), the amount of cutting allowance required in the third step of the device manufacturing process (see FIGS. 13A and 13B). It is only set long. Therefore, chips generated when the lead base material (50) is cut in the third step can be reduced. Therefore, the amount of the lead base material (50) used is reduced.

  In the above solid electrolytic capacitor, the two lead portions (121) and (121) of the anode lead (12) and the anode terminal surface (30) can be obtained without changing the shape of the anode terminal surface (30) from the conventional shape. Can be made substantially the same distance L (see FIG. 4). Accordingly, the distance L is approximately the same as the distance between the lead portion of the anode lead and the anode terminal surface of the conventional solid electrolytic capacitor in which the anode lead is only drawn from one place on the surface of the anode body. In this way, by mounting the capacitor element (1) on the anode terminal (3) and the cathode terminal (4), the number of the lead portions (121) of the anode lead (12) is increased and the anode body (11 ) And the anode terminal surface (30), the electrical resistance and / or inductance is reduced. As a result, the ESR and / or the ESL of the solid electrolytic capacitor can be reduced.

  Further, in the above solid electrolytic capacitor, the height dimension of each first electrical connection portion (31) according to the height position of the lead portion (121) of the anode lead (12) from the upper surface of the anode terminal (3). H (see FIG. 5) can be changed. Therefore, by adjusting the height dimension H of each first electrical connection portion (31) according to the height position of the lead portion (121) of the anode lead (12) from the upper surface of the anode terminal (3), The distal end portion (310) of the first electrical connection portion (31) can be reliably brought into contact with the lead portion (121) of the anode lead (12) corresponding thereto. Therefore, according to the solid electrolytic capacitor, the electrical connection between the anode terminal (3) and each lead portion (121) of the anode lead (12) is good.

  Furthermore, according to the solid electrolytic capacitor, the first metal connection part (31) (31) can be easily formed by bending the first metal plate (52) to be the anode terminal (3). Can be formed. Moreover, the height dimension H of each 1st electrical-connection part (31) can be easily changed only by changing the bending position of the 1st metal plate (52).

  FIGS. 15A and 15B are diagrams used for explaining a modification of the step of forming the cathode layer (15) of the capacitor element (1) in the second step of the element manufacturing step. It is. In the step of forming the carbon layer (151), as shown in FIG. 15 (a), the rotating device (8) is driven to rotate the lead base material (50) around its central axis, and thereafter, FIG. As shown in b), the treatment tank (73) may be raised while maintaining the rotation state. At this time, in the treatment tank (73), the lead base material (50) is not immersed in the carbon paste (703), and both ends of each anode body (11) are rotated by the rotation of the lead base material (50) ( 111) and (112) are raised to a height where they will pass through the carbon paste (703). Thereby, both end portions (111) and (112) of each anode body (11) are immersed in the carbon paste (703). In the step of forming the silver paste layer (152), the same operation as the formation of the carbon layer (151) can be performed.

  According to the method according to the modification, as shown in FIG. 16 or FIG. 17, each anode body (11) of the anode structure (5) has a cathode layer in a predetermined region on the outer peripheral surface of the electrolyte layer (14). While (15) is formed, a region R3 without the cathode layer (15) is formed on the outer peripheral surface of the electrolyte layer (14). The shape of the region R3 is determined according to the magnitude relationship between the distance T1 and the distance T2 shown in FIG. Here, the distance T1 is a region covering the side surface (11c) of the anode body (11) in the outer peripheral surface of the electrolyte layer (14) from the central axis (501) of the lead base material (50) (also in FIG. 3). (See below). The distance T2 is a distance from the central axis (501) of the lead base material (50) to the liquid surface (703a) of the processing liquid (703).

  Specifically, when the distance T1 is smaller than the distance T2 (T1 <T2), the region R3 has a shape extending in a strip shape on the outer peripheral surface of the electrolyte layer (14), and as shown in FIG. In addition, on the region (see also FIG. 2) that covers the first surface (11a) and the second surface (11b) of the anode body (11) in the outer peripheral surface of the electrolyte layer (14), The edge draws an arc shape centering on the central axis (501) of the lead base material (50).

  On the other hand, when the distance T1 is larger than the distance T2 (T1> T2), the region R3 covers the side surface (11c) of the anode body (11) in the outer peripheral surface of the electrolyte layer (14) (also FIG. 3). On the other hand, as shown in FIG. 17, the region R3 includes the first surface (11a) and the second surface of the anode body (11) in the outer peripheral surface of the electrolyte layer (14). On the region covering the surface (11b) (see also FIG. 2), the anode lead (50) has a shape extending in a substantially circular shape around the central axis (501). In this case, in the manufactured capacitor element (1), the area of the region covered by the cathode layer (15) in the outer peripheral surface of the electrolyte layer (14) is increased, and as a result, in the manufactured solid electrolytic capacitor Further reduction in ESR will be realized.

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, with respect to various configurations of the solid electrolytic capacitor, these shapes and dimensions are not limited to those shown in the above embodiments and drawings, and various modifications can be made within the technical scope described in the claims.

  In the solid electrolytic capacitor, each lead portion (121) of the anode lead (12) and the anode terminal (3) may be electrically connected to each other through a conductive pillow member. In the solid electrolytic capacitor, the anode lead (12) (12) is formed in the capacitor element (1) by implanting two anode leads (12) (12) on the anode body (11). Capacitor elements drawn from the first surface (11a) and the second surface (11b) of the anode body (11) may be employed.

(1) Capacitor element
(1a) First drawer surface
(1b) Second drawer surface
(1c) Bottom surface
(10) Anode structure
(11) Anode body
(11a) First side
(11b) Second side
(111) edge
(112) Edge
(12) Anode lead
(121) Drawer
(13) Dielectric layer
(14) Electrolyte layer
(15) Cathode layer
(2) Exterior material
(2a) Bottom surface
(3) Anode terminal
(30) Anode terminal surface
(31) First electrical connection
(310) Tip
(32) Joint
(4) Cathode terminal
(40) Cathode terminal surface
(41) Second electrical connection
(42) Conductive adhesive
(5) Anode structure
(50) Lead base material
(51) Capacitor element body
(52) First metal plate
(521) First flat plate
(522) Second flat plate
(53) Second metal plate
(531) First flat plate
(532) Second flat plate
(6) Career bar
(701) Electrolytic solution
(702) Electrolytic polymerization solution
(703) Carbon paste (treatment liquid)
(704) Silver paste (treatment liquid)
(8) Rotating device R0 Predetermined region R1 First region R2 Second region

Claims (4)

A capacitor element having two anode parts and a cathode part; and an exterior member covering the capacitor element. An anode terminal is electrically connected to the two anode parts of the capacitor element, and the surface of the anode terminal is By exposing a part of the surface of the exterior member to the lower surface of the exterior member, an anode terminal surface is formed on the lower surface of the exterior member. On the other hand, a cathode terminal is electrically connected to the cathode portion of the capacitor element. In the solid electrolytic capacitor in which the cathode terminal surface is formed on the lower surface of the exterior member by exposing the portion on the lower surface of the exterior member, and the anode terminal surface is disposed apart from the cathode terminal surface in a predetermined direction,
The capacitor element includes an anode body and an anode lead planted on the anode body. The outer peripheral surface of the anode body includes a first surface and a second surface that are substantially opposed to each other. The anode lead is drawn out from both the first surface and the second surface, a dielectric layer is formed on at least a part of the outer peripheral surface of the anode body, an electrolyte layer is formed on the dielectric layer, and the electrolyte layer A cathode layer is formed on the anode lead, and the two lead portions are formed by two lead portions drawn from both the first surface and the second surface of the anode body in the anode lead. The cathode portion is configured;
Capacitor elements are mounted on the anode terminal and the cathode terminal in such a manner that the two lead portions of the anode lead are oriented in a direction substantially perpendicular to the predetermined direction and in a direction opposite thereto. Solid electrolytic capacitor characterized by   2. The electrical connection portion according to claim 1, wherein an electrical connection portion that extends in an inverted L shape from the anode terminal and electrically connects the anode terminal and each lead portion of the anode lead is provided in the exterior member. Solid electrolytic capacitor.   The electrical connection portion extends in an inverted L shape from two locations on the cathode terminal surface side of the outer peripheral edge of the anode terminal surface, and each electrical connection portion bends a portion of the anode terminal into an inverted L shape. The solid electrolytic capacitor according to claim 2, wherein the solid electrolytic capacitor is formed by deformation.   4. The capacitor element according to claim 1, wherein one anode lead is drawn from both the first surface and the second surface of the anode body by penetrating the anode body. 5. The solid electrolytic capacitor described in 1.

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