JP5601711B2 - Multilayer solid electrolytic capacitor - Google Patents

Description

  The present invention relates to a multilayer solid electrolytic capacitor.

  With the recent increase in frequency of electronic devices, solid electrolytic capacitors are required to have low ESR and low ESL. As a result of proceeding with the experiment on the terminal structure of the multilayer solid electrolytic capacitor, the applicant of the present application directly connected the anode terminals of the lead frames opposed to one side and the other side with a conductive member (connecting portion), A structure in which ESR and ESL are further reduced is proposed (see, for example, Patent Document 1).

  Further, the applicant of the present invention has proposed a structure in which an insulator having a rectangular shape in a plan view is disposed so as to cover the gap between the connecting portion and the cathode terminal of the lead frame in the multilayer solid electrolytic capacitor described in Patent Document 1. (For example, refer to Patent Document 2 and Patent Document 3). According to these multi-layer solid electrolytic capacitors, when the laminated body in which the capacitor elements are laminated and the cathode terminal of the lead frame are connected with the conductive adhesive, the conductive adhesive adheres to the connecting portion and the cathode terminal It can prevent that a connection part short-circuits.

JP 2007-180327 A JP 2009-21355 A Japanese Patent Application No. 2009-128852

  However, in the multilayer solid electrolytic capacitors described in Patent Document 2 and Patent Document 3, since the insulator is disposed only on the peripheral edge on the connection portion side of the stacked surface of the cathode terminal facing the stacked body, If the amount of the applied conductive adhesive is larger than the expected amount, the conductive adhesive spread to the connecting portion side when connecting the laminate and the cathode terminal will be transmitted through the end face of the insulator. The cathode terminal and the anode terminal may be short-circuited by adhering to the anode terminal, leaving room for improvement.

  The present invention has been made in view of the above circumstances, and the problem is that the conductive adhesive can be more reliably prevented from adhering to the anode terminal along the end face of the insulator. The object is to provide a multilayer solid electrolytic capacitor.

In order to solve the above problems, a multilayer solid electrolytic capacitor according to a first aspect of the present invention is a capacitor element in which an anode part is formed on one side and a cathode part is formed on the other side of a flat plate anode element made of a valve metal. A plurality of stacked layers so that the protruding direction of the anode portion is opposite, a one-side anode terminal electrically connected to the anode portion protruding from one side of the stacked body, and the other side of the stacked body The other-side anode terminal electrically connected to the anode portion protruding from the connector, the connecting portion for electrically connecting the one-side anode terminal and the other-side anode terminal, the connecting portion, the one-side anode terminal, and the other-side anode terminal And a cathode terminal electrically connected to a cathode body composed of cathode portions of a plurality of capacitor elements, wherein the coupling portion faces the laminate Laminating surface and connecting portion In addition to the gap between the electrode terminal, and a first insulator which covers also the gap between the cathode terminal and the one side and the other side an anode terminal, a first insulator of the laminated surface of the cathode terminal is not located And a second insulator arranged in the region and dividing the region into a plurality of regions .

According to this configuration, in addition to the gap between the connecting portion and the cathode terminal, the gap between the one side and the other side anode terminal and the cathode terminal is also covered with the first insulator. When the negative electrode terminal is connected with the conductive adhesive, it is possible to prevent the conductive adhesive from adhering to the connecting portion, and further, the conductive adhesive travels along the end face of the first insulator. It is also possible to prevent adhesion to the side and other side anode terminals. Further, according to this configuration, the second insulator that divides the region where the first insulator is not arranged into a plurality of regions is sandwiched between the cathode body of the multilayer body and the cathode terminal of the lead frame to conduct electricity. Since this becomes a barrier when the conductive adhesive is about to spread, the spread of the conductive adhesive can be suppressed. Furthermore, since the conductive adhesive adheres not only to the upper surface of the second insulator but also to the side surfaces, the adhesive strength between the cathode body of the laminated body and the cathode terminal of the lead frame can be improved.

In order to solve the above-described problem, the multilayer solid electrolytic capacitor according to the second aspect of the present invention has a flat plate anode element made of a valve metal having an anode portion on one side and a cathode portion on the other side. A laminated body in which a plurality of capacitor elements are stacked so that the protruding direction of the anode part is opposite; a one-side anode terminal electrically connected to the anode part protruding from one side of the laminated body; The other side anode terminal electrically connected to the anode part protruding from the other side, the connection part electrically connecting the one side anode terminal and the other side anode terminal, the connection part, the one side anode terminal and the other side A cathode terminal disposed apart from the anode terminal and having a rectangular laminated surface facing the laminated body, the laminated surface being electrically connected to a cathode body comprising cathode portions of a plurality of capacitor elements; Multi-layer solid electrolytic condenser with In addition to the laminated surface of the connecting portion facing the laminate and the peripheral edge on the connecting portion side of the laminated surface of the cathode terminal, the one side anode terminal side and the other side anode terminal on the laminated surface of the cathode terminal A first insulator disposed also on a peripheral edge of the cathode terminal, and a second insulating layer disposed in a region where the first insulator is not disposed on the laminated surface of the cathode terminal, and dividing the region into a plurality of regions And an insulator .

According to this configuration, instead of covering the gap between the one-side and other-side anode terminal and the cathode terminal with the first insulator, on the peripheral edge on the one-side anode terminal side and on the other-side anode terminal side in the laminated surface of the cathode terminal By disposing the first insulator on the periphery, it is possible to prevent the conductive adhesive from adhering to the one side and the other side anode terminals along the end face of the first insulator. Further, according to this configuration, the second insulator that divides the region where the first insulator is not arranged into a plurality of regions is sandwiched between the cathode body of the multilayer body and the cathode terminal of the lead frame to conduct electricity. Since this becomes a barrier when the conductive adhesive is about to spread, the spread of the conductive adhesive can be suppressed. Furthermore, since the conductive adhesive adheres not only to the upper surface of the second insulator but also to the side surfaces, the adhesive strength between the cathode body of the laminated body and the cathode terminal of the lead frame can be improved.

In order to solve the above problems, a multilayer solid electrolytic capacitor according to a third aspect of the present invention is a capacitor element in which an anode part is formed on one side and a cathode part is formed on the other side of a flat plate anode element made of a valve metal. A plurality of stacked layers so that the protruding direction of the anode portion is opposite, a one-side anode terminal electrically connected to the anode portion protruding from one side of the stacked body, and the other side of the stacked body The other-side anode terminal electrically connected to the anode portion protruding from the connector, the connecting portion for electrically connecting the one-side anode terminal and the other-side anode terminal, the connecting portion, the one-side anode terminal, and the other-side anode terminal And a cathode terminal electrically connected to a cathode body composed of cathode portions of a plurality of capacitor elements, wherein the coupling portion faces the laminate Laminating surface and connecting portion In addition to the gap with the electrode terminal, a first insulator that covers the gap between the cathode terminal and the one-side and other-side anode terminals is further provided on the periphery of the cathode terminal of the end face of the first insulator. A plurality of irregularities are formed in a certain portion.

In order to solve the above problems, a multilayer solid electrolytic capacitor according to a fourth invention of the present invention is a capacitor element in which an anode part is formed on one side and a cathode part is formed on the other side of a flat plate anode element made of a valve action metal. A plurality of stacked layers so that the protruding direction of the anode portion is opposite, a one-side anode terminal electrically connected to the anode portion protruding from one side of the stacked body, and the other side of the stacked body The other-side anode terminal electrically connected to the anode portion protruding from the connector, the connecting portion for electrically connecting the one-side anode terminal and the other-side anode terminal, the connecting portion, the one-side anode terminal, and the other-side anode terminal And a cathode terminal having a rectangular laminated surface facing the laminated body, the laminated surface being electrically connected to a cathode body composed of cathode portions of a plurality of capacitor elements, Multilayer solid electrolytic capacitor In addition to the laminated surface of the connecting portion facing the laminated body and the peripheral edge on the connecting portion side of the laminated surface of the cathode terminal, the one-side anode terminal side and the other-side anode terminal side of the laminated surface of the cathode terminal A first insulator is also provided on the periphery, and a plurality of irregularities are formed on a portion of the end surface of the first insulator on the periphery of the cathode terminal.

According to these structures, since the plurality of irregularities are formed in the portion of the end face of the first insulator on the periphery of the cathode terminal, the conductive adhesive travels along the end face of the first insulator. As a result, the distance traveled until it leaks to the periphery of the cathode terminal becomes long, so that the conductive adhesive can be kept on the laminated surface of the cathode terminal without leaking to the periphery of the cathode terminal.

In order to solve the above problems, a multilayer solid electrolytic capacitor according to a fifth aspect of the present invention is a capacitor element in which an anode part is formed on one side and a cathode part is formed on the other side of a flat plate anode element made of a valve metal. A plurality of stacked layers so that the protruding direction of the anode portion is opposite, a one-side anode terminal electrically connected to the anode portion protruding from one side of the stacked body, and the other side of the stacked body The other-side anode terminal electrically connected to the anode portion protruding from the connector, the connecting portion for electrically connecting the one-side anode terminal and the other-side anode terminal, the connecting portion, the one-side anode terminal, and the other-side anode terminal And a cathode terminal electrically connected to a cathode body composed of cathode portions of a plurality of capacitor elements, wherein the coupling portion faces the laminate Laminating surface and connecting portion In addition to the gap with the electrode terminal, a first insulator that covers the gap between the cathode terminal and the one-side and other-side anode terminals is further provided on the periphery of the cathode terminal of the end face of the first insulator. A certain part is formed with a collar part.

In order to solve the above problems, a multilayer solid electrolytic capacitor according to a sixth aspect of the present invention is a capacitor element in which an anode portion is formed on one side and a cathode portion is formed on the other side of a flat plate anode element made of a valve metal. A plurality of stacked layers so that the protruding direction of the anode portion is opposite, a one-side anode terminal electrically connected to the anode portion protruding from one side of the stacked body, and the other side of the stacked body The other-side anode terminal electrically connected to the anode portion protruding from the connector, the connecting portion for electrically connecting the one-side anode terminal and the other-side anode terminal, the connecting portion, the one-side anode terminal, and the other-side anode terminal And a cathode terminal having a rectangular laminated surface facing the laminated body, the laminated surface being electrically connected to a cathode body composed of cathode portions of a plurality of capacitor elements, Multilayer solid electrolytic capacitor In addition to the laminated surface of the connecting portion facing the laminated body and the peripheral edge on the connecting portion side of the laminated surface of the cathode terminal, the one-side anode terminal side and the other-side anode terminal side of the laminated surface of the cathode terminal A first insulator disposed on the periphery is further provided, and a collar portion is formed on a portion of the end surface of the first insulator on the periphery of the cathode terminal.

According to these structures, since the collar part is formed in the part which exists on the periphery of a cathode terminal among the end surfaces of a 1st insulator, a conductive adhesive is in the space between a collar part and a cathode terminal. Since it flows in, the conductive adhesive can be kept on the laminated surface of the cathode terminal, and further, the conductive adhesive that flows into the space between the collar portion and the cathode terminal of the cathode terminal constituting this space. Adhesion strength between the cathode body of the laminate and the cathode terminal of the lead frame can also be improved by adhering to the laminate surface, the end face of the first insulator, and the lower surface of the flange. Note that the collar portion may be formed by stacking two or more first insulators.

The first insulator is preferably disposed on the entire periphery of the laminated surface of the cathode terminal. According to this configuration, the conductive adhesive can be kept on the laminated surface of the cathode terminal without leaking around the cathode terminal.

  ADVANTAGE OF THE INVENTION According to this invention, the lamination type solid electrolytic capacitor which can prevent more reliably that a conductive adhesive adheres to an anode terminal along the end surface of an insulator can be provided.

It is a capacitor | condenser element in the 1st Embodiment of this invention, Comprising: (a) is a top view, (b) is sectional drawing. It is a laminated body in 1st Embodiment, Comprising: (a) is a top view, (b) is a side view, (c) is a side view which shows the state arrange | positioned on a lead frame. 1A is a plan view of a lead frame according to a first embodiment, and FIG. 2B is a plan view showing a state in which an insulating tape is arranged. 1A is a plan view, FIG. 2B is a cross-sectional view taken along line A, and FIG. 1C is a cross-sectional view taken along line B. FIG. FIG. 1A is a bottom view and FIG. 2B is a side view of a multilayer solid electrolytic capacitor according to a first embodiment. It is a top view which shows the insulating tape in the 2nd Embodiment of this invention. It is a top view which shows the insulating tape in the 3rd Embodiment of this invention. It is a top view which shows the insulating tape in the 4th Embodiment of this invention. It is a top view which shows the insulating tape in the 5th Embodiment of this invention. It is a fragmentary sectional view showing the insulating tape in the 6th embodiment of the present invention. It is a top view which shows the insulating tape in the modification of this invention.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals are assigned to the same members.

[First Embodiment]
FIG. 1A is a plan view of a capacitor element used in the multilayer solid electrolytic capacitor according to the first embodiment of the present invention, and FIG. As shown in the figure, the capacitor element C is composed of an anode element 1, a dielectric film 2, a solid electrolyte layer 3, a carbon layer 4, a silver layer 5, and a creeping prevention material 6.

  The anode element 1 is a flat thin plate having a width (w) of 10 mm and a length (l) of 15 mm whose main component is aluminum which is a valve action metal, and one side thereof constitutes an anode part 7. Dielectric film 2 is an oxide film layer formed on the other surface of anode element 1. The solid electrolyte layer 3 is a layer formed on the surface of the dielectric film 2, and is formed, for example, by chemical polymerization, electrolytic polymerization, or impregnation of an electrolyte containing a conductive polymer such as polyethylenedioxythiophene (PEDOT). Layer. The carbon layer 4 and the silver layer 5 are cathode lead layers sequentially formed on the surface of the solid electrolyte layer 3, and together with the solid electrolyte layer 3 constitute a cathode portion. The creeping prevention material 6 is a ring-shaped film provided between the anode portion 7 and the solid electrolyte layer 3 to insulate and isolate the anode portion 7 and the cathode portion.

  The capacitor element C is manufactured as follows. First, an anode element 1 made of an aluminum thin plate having a thickness of 0.1 mm whose surface was electrochemically roughened was anodized for about 60 minutes by applying a voltage of 10 V in an aqueous solution of ammonium adipate. A dielectric film 2 that is an oxide film layer is formed on the surface of the element 1. Next, after the anode element 1 on which the dielectric film 2 is formed is cut into dimensions of width (w) 10 mm and length (l) 15 mm, an insulating resin is applied around an appropriate position so as to be wound in the circumferential direction. The creeping prevention material 6 is formed and divided into a region to be the anode portion 7 and a region to be the cathode portion. Next, the cut surface where the anode element 1 is exposed by the above cutting is again subjected to an anodizing treatment for about 30 minutes by applying a voltage of 7 V in an aqueous solution of ammonium adipate to form the dielectric film 2 on the cut surface. . Thereafter, the capacitor element C is completed by sequentially forming the solid electrolyte layer 3, the carbon layer 4 and the silver layer 5 on the surface of the dielectric film 2.

  FIG. 2 shows a laminate composed of four capacitor elements C1 to C4 manufactured by the above method. As shown in the figure, the laminated body is obtained by laminating capacitor elements C1 to C4 such that the protruding directions of the anode portions 7 and 7 'are alternately opposite. The cathode portions of the capacitor elements C1 to C4 are respectively connected by the conductive adhesive 8 (hereinafter, the cathode portions of the capacitor elements C1 to C4 are collectively referred to as “cathode bodies”). The anode portions 7 and 7 'of the laminate are respectively connected to the anode terminals 9 and 9' of the lead frame by a method such as resistance welding. Further, the cathode body of the laminated body is connected to the cathode terminal 10 of the lead frame via the conductive adhesive 8.

  As shown in FIG. 3A, the lead frame includes anode terminals 9 and 9 ′, cathode terminals 10 and 10 ′, and a connecting portion 11. When a is the width of the connecting portion 11 and W is the width of the exterior resin 13 (equal to the width b of the anode terminals 9 and 9 ′), the value of (a ÷ W) × 100 corresponds to the width of the exterior resin 13. The ratio of the width of.

  The anode terminals 9 and 9 'are arranged over the entire width direction of the exterior resin 13, and the anode terminals 9 and 9' are connected to each other with a length of 12.6 mm made of the same material (for example, a copper alloy) as the anode terminals 9 and 9 '. They are connected by the section 11. In this embodiment, an H-shaped lead frame in which the anode terminals 9, 9 'and the connecting portion 11 are integrated is used. In the cross section of the H-shaped lead frame, as shown in FIG. 4B, the anode terminals 9 and 9 'at both ends are thick and the connecting portion 11 is thin. As shown in FIG. 5A, the connecting portion 11 is embedded in the exterior resin 13, so that the anode terminals 9, 9 ′ and the connecting portion 11 are not easily removed from the exterior resin 13.

  Each of the cathode terminals 10 and 10 ′ has a width (c) of 4.34 mm and a length (d) of 4.3 mm, and is symmetrical with respect to the connecting portion 11 with a gap of 0.5 mm from the connecting portion 11. (G1), with a gap (g2) of 4.15 mm from the anode terminals 9, 9 ′. Further, as shown in FIG. 5B, the cathode terminals 10, 10 'and the anode terminals 9, 9' are arranged such that the exposed surfaces from the exterior resin 13 are on the same plane.

  The connecting portion 11 has a width (a) that is 20% of the width (W) of the exterior resin 13, and the anode terminals 9 and 9 'are connected as short as possible between the anode terminals 9 and 9'. Has been placed.

  The insulating tape (first insulator) 12 prevents the conductive adhesive 8 from adhering to the connecting portion 11 when the cathode body and the cathode terminals 10, 10 ′ are connected by the conductive adhesive 8. It is for prevention. As shown in FIG. 3B, the insulating tape 12 is disposed on a surface (laminate surface) facing the laminate of the connecting portion 11. Specifically, an H-shaped polyimide tape having a lengthwise dimension of 12.6 mm is used as the insulating tape 12, and the entire laminated surface of the connecting portion 11 and the gap between the connecting portion 11 and the cathode terminals 10, 10 ′. It arrange | positions so that (g1) and the part of the width | variety of 0.5 mm from the connection part 11 side may be covered among the periphery of the laminated surface of cathode terminal 10 and 10 '.

  In the multilayer solid electrolytic capacitor according to the present embodiment, the polyimide tape as the insulating tape 12 further causes a gap (g2) between the cathode terminals 10 and 10 ′ and the anode terminals 9 and 9 ′ and the cathode terminals 10 and 10 ′. A portion having a width of 0.5 mm from the anode terminals 9, 9 ′ side is covered in the peripheral edge of the laminated surface.

  The insulating tape 12 has a predetermined thickness of 10 μm or less. If this thickness is too thick, the adhesive strength between the cathode body of the laminate and the cathode terminals 10 and 10 'of the lead frame is weakened. If this thickness is too thin, the cathode body and the cathode terminals 10 and 10' are sandwiched. The conductive adhesive 8 overflows on the insulating tape 12.

  As described above, according to the multilayer solid electrolytic capacitor according to the present embodiment, when the multilayer body including the capacitor elements C1 to C4 is stacked on the lead frame, the cathode body of the multilayer body and the cathode terminal 10 of the lead frame, Even if the conductive adhesive 8 is spread between 10 ′ and 10 ′, the gap (g2) between the cathode terminals 10 and 10 ′ and the anode terminals 9 and 9 ′ is covered with the insulating tape 12, so that it is spread. The conductive adhesive 8 spreads along the end face of the insulating tape 12 in the outward direction of the multilayer solid electrolytic capacitor (the direction opposite to the connecting portion 11 side). For this reason, according to the multilayer solid electrolytic capacitor according to the present embodiment, the conductive adhesive 8 adheres to the anode terminals 9 and 9 ′, and the cathode terminals 10 and 10 ′ and the anode terminals 9 and 9 ′ are short-circuited. Can be surely prevented.

  Furthermore, in the multilayer solid electrolytic capacitor according to the present embodiment, the gap (g1) between the connecting portion 11 and the cathode terminals 10 and 10 ′ is covered with the insulating tape 12, as in the conventional multilayer solid electrolytic capacitor. The spread of the conductive adhesive 8 can be blocked by the end face of the insulating tape 12. Even if the conductive adhesive 8 overflows on the insulating tape 12, the entire laminated surface of the connecting portion 11 is covered with the insulating tape 12. It can prevent adhering to the bottom.

[Second Embodiment]
FIG. 6 is a plan view of an insulating tape 12A used in the multilayer solid electrolytic capacitor according to the second embodiment of the present invention. The multilayer solid electrolytic capacitor according to the present embodiment is common to the multilayer solid electrolytic capacitor according to the first embodiment except that an insulating tape 12A is disposed instead of the insulating tape 12.

  As shown in the figure, the insulating tape 12A includes the entire laminated surface of the connecting portion 11, the gap between the connecting portion 11 and the cathode terminals 10, 10 ', and the gap between the cathode terminals 10, 10' and the anode terminals 9, 9 '. And it arrange | positions so that the whole periphery of the laminated surface of cathode terminal 10 and 10 'may be covered. For this reason, according to the multilayer solid electrolytic capacitor according to the present embodiment, it is possible to prevent the conductive adhesive 8 from adhering to the side surfaces and the bottom surface of the anode terminals 9, 9 ′ and the connecting portion 11, and further, the conductive The adhesive 8 can be kept on the laminated surface of the cathode terminals 10 and 10 ′ without leaking around the cathode terminals 10 and 10 ′.

[Third Embodiment]
FIG. 7 is a plan view of insulating tapes 12B and 12B ′ used in the multilayer solid electrolytic capacitor according to the third embodiment of the present invention. The multilayer solid electrolytic capacitor according to the present embodiment is the second embodiment except that an insulating tape (second insulator) 12B ′ is further arranged in addition to the insulating tape (first insulator) 12B. This is common with the multilayer solid electrolytic capacitor according to the embodiment.

  As shown in the figure, in the multilayer solid electrolytic capacitor according to the present embodiment, the insulating tape (first insulator) 12B is arranged in the same manner as the insulating tape 12A in the second embodiment, and further, the insulating tape The tape (second insulator) 12B ′ is disposed in a region where the insulating tape 12B is not disposed on the laminated surface of the cathode terminals 10 and 10 ′. The insulating tape 12B 'has a mesh shape in which the above-described region is divided into a plurality of regions and a plurality of openings are formed.

  According to the multilayer solid electrolytic capacitor according to the present embodiment, the side surface of the insulating tape 12B ′ serves as a barrier that suppresses the spread of the conductive adhesive 8, so that the conductive adhesive 8 is disposed around the cathode terminals 10, 10 ′. The cathode terminals 10 and 10 'can be kept on the laminated surface without leaking out. Further, since the conductive adhesive 8 adheres not only to the laminated surface of the cathode terminals 10 and 10 ′ but also to the upper surface and side surfaces of the insulating tape 12B ′, the laminated cathode body and the lead frame cathode terminals 10 and 10 ′. The adhesive strength can be improved. The insulating tape (first insulator) 12B and the insulating tape (second insulator) 12B 'may be separate or integrated, and may have different thicknesses.

[Fourth Embodiment]
FIG. 8 is a plan view of insulating tapes 12C and 12C ′ used in the multilayer solid electrolytic capacitor according to the fourth embodiment of the present invention. The multilayer solid electrolytic capacitor according to the present embodiment is common to the multilayer solid electrolytic capacitor according to the third embodiment except that the insulating tape 12C ′ is disposed instead of the insulating tape 12B ′.

  As shown in the figure, in the multilayer solid electrolytic capacitor according to this embodiment, an insulating tape (second insulator) 12C ′ having a slit-shaped opening is used instead of the mesh-shaped insulating tape 12B ′. Has been placed. For this reason, according to the multilayer solid electrolytic capacitor according to the present embodiment, the same effects as those of the multilayer solid electrolytic capacitor according to the third embodiment can be obtained.

[Fifth Embodiment]
FIG. 9 is a plan view of an insulating tape 12D used in the multilayer solid electrolytic capacitor according to the fifth embodiment of the present invention. The multilayer solid electrolytic capacitor according to the present embodiment is common to the multilayer solid electrolytic capacitor according to the first embodiment except that an insulating tape 12D is disposed instead of the insulating tape 12.

  As shown in the figure, in the multilayer solid electrolytic capacitor according to the present embodiment, a plurality of mountain-shaped irregularities 14 are formed on a portion of the end face of the insulating tape 12D on the periphery of the cathode terminals 10, 10 ′. ing. The irregularities 14 may be a plurality of irregularities along the thickness direction of the insulating tape 12D, or may be formed by roughening the end surface.

  By forming a plurality of projections and depressions 14 on the edge of the insulating tape 12D on the periphery of the cathode terminals 10, 10 ', the conductive adhesive 8 travels along the edge and around the cathode terminals 10, 10'. The moving distance until it leaks becomes longer. Further, the unevenness 14 becomes a barrier when the conductive adhesive 8 moves along the end face. As a result, according to the multilayer solid electrolytic capacitor according to the present embodiment, it is possible to suppress the conductive adhesive 8 from spreading along the end face of the insulating tape 12D.

[Sixth Embodiment]
FIG. 10 is a partial cross-sectional view of an insulating tape 12E used in the multilayer solid electrolytic capacitor according to the sixth embodiment of the present invention. The multilayer solid electrolytic capacitor according to the present embodiment is common to the multilayer solid electrolytic capacitor according to the first embodiment except that an insulating tape 12E is disposed instead of the insulating tape 12.

  As shown in the figure, in the multilayer solid electrolytic capacitor according to the present embodiment, a flange portion 15 is formed over a portion of the end face of the insulating tape 12E on the periphery of the cathode terminals 10, 10 '. The flange 15 may be formed by laminating two or more insulating tapes 12E having different sizes, or formed by providing a step on a part of the end surface of one insulating tape 12E. It may be.

  According to the multilayer solid electrolytic capacitor according to the present embodiment, by providing the flange portion 15, the conductive adhesive 8 flows into the space between the flange portion 15 and the cathode terminals 10 and 10 ′. 8 can be kept on the laminated surface of the cathode terminals 10, 10 ′. Further, the conductive adhesive 8 that has flowed into the space between the flange portion 15 and the cathode terminals 10 and 10 ′, the laminated surface of the cathode terminals 10 and 10 ′ constituting the space, the end surface of the insulating tape 12E, and the flange portion. By adhering to the lower surface of 15, the adhesive strength between the cathode body of the laminate and the cathode terminals 10, 10 ′ of the lead frame can be improved.

  The preferred embodiments of the multilayer solid electrolytic capacitor according to the present invention have been described above, but the present invention is not limited to these configurations.

  For example, the above embodiments can be arbitrarily combined. For example, the flange portion 15 may be further formed on the insulating tape 12D on which the plurality of projections and depressions 14 are formed by combining the fifth embodiment and the sixth embodiment.

  In addition, in the first embodiment, the entire laminated surface of the connecting portion 11, the gap (g1) between the connecting portion 11 and the cathode terminals 10, 10 ′, the cathode terminals 10, 10 ′, and the anode terminals 9, 9 are used. The gap (g2) between the cathode terminal 10, 10 ′ and the peripheral edge on the connecting portion 11 side and the peripheral edge on the anode terminal 9, 9 ′ side are covered with the insulating tape 12 at least. It is only necessary that the laminated surface of the portion 11 and the peripheral edge on the connecting portion 11 side and the peripheral edge on the anode terminal 9, 9 ′ side of the laminated surface of the cathode terminals 10 and 10 ′ are covered with an insulating tape. For example, as shown in FIG. 11, if the periphery of the anode terminals 9 and 9 ′ side of the laminated surface of the cathode terminals 10 and 10 ′ is covered with the insulating tape 12 </ b> F, the cathode terminals 10 and 10 ′ and the anode terminal 9 are used. Even if the gap (g2) with 9 ′ is not covered, the same effect as the multilayer solid electrolytic capacitor according to the first embodiment can be obtained.

  Furthermore, in each said embodiment, although the insulating tape 12 of the length of 12.6 mm which is the same length as the connection part 11 was used, the length of the insulating tape 12 can be changed arbitrarily. For example, the insulating tape 12 may be disposed so as to cover a portion having a width of 0.5 mm from the connecting portion 11 side of the anode terminals 9 and 9 ′. According to this configuration, since the four corners of the insulating tape 12 are arranged and fixed on the anode terminals 9 and 9 ′, the shape of the insulating tape 12 is not easily deformed when sealed with the exterior resin 13, and the shape is stabilized.

  As the insulating tape 12, in addition to the polyimide tape, a Teflon (registered trademark) tape, a glass fiber-containing tape, a polypropylene tape, a polyethylene terephthalate tape, a polytetrafluoroethylene tape, a polyester tape, or the like may be used. Further, a liquid material may be used in place of the insulating tape 12. That is, the same effect can be obtained if the first and second insulators are insulating materials. In addition, when using a liquid material having a relatively high viscosity, an insulator having a desired shape can be obtained by applying the liquid material in a limited manner using a metal mask having a desired shape such as a mesh shape or a slit shape. Can be formed.

  In each of the above embodiments, aluminum is used as the valve action metal and a conductive polymer is used as the solid electrolyte layer 3, but tantalum, niobium foil, or a sintered body of these metal powders may be used instead of aluminum. Instead of the conductive polymer, manganese dioxide may be used.

  Further, the conductive member of the connecting portion 11 is made of the same material as that of the anode terminals 9 and 9 ', and is integrally formed. However, the anode material is copper, silver other than aluminum, gold, niobium, tantalum, conductive polymer. Conductive materials such as can also be used effectively.

  Further, two or more connecting portions 11 between the anode terminals 9 and 9 'may be provided, and the cathode terminal may be disposed between them.

  Further, in each of the above embodiments, an example in which four capacitor elements C are stacked has been described, but the number of stacked capacitor elements C can be arbitrarily changed.

  In the above-described embodiment, the example in which the lead frame is disposed on the lower side of the multilayer body has been described.

C, C1 to C4 Capacitor element 1 Anode element 2 Dielectric film 3 Solid electrolyte layer 4 Carbon layer 5 Silver layer 6 Scoop preventive material 7, 7 ′ Anode portion 8 Conductive adhesive 9, 9 ′ Anode terminal 10, 10 ′ Cathode terminal 11 connecting part 12, 12A-12F Insulating tape (first insulator)
12B ′, 12C ′ insulating tape (second insulator)
13 Exterior resin 14 Concavity and convexity 15

Claims (8)

A laminated body constituted by stacking a plurality of capacitor elements in which the anode part is formed on one side and the cathode part is formed on the other side of the flat anode element made of a valve metal so that the protruding direction of the anode part is opposite;
A one-side anode terminal electrically connected to the anode portion protruding from one side of the laminate;
The other-side anode terminal electrically connected to the anode portion protruding from the other side of the laminate,
A connecting portion for electrically connecting the one side anode terminal and the other side anode terminal;
A cathode terminal disposed apart from the coupling portion, the one-side anode terminal, and the other-side anode terminal, and electrically connected to a cathode body comprising cathode portions of the plurality of capacitor elements. A multilayer solid electrolytic capacitor,
In addition to the stacking surface of the connecting portion facing the stacked body and the gap between the connecting portion and the cathode terminal, a first gap that covers the gap between the cathode terminal and the one side anode terminal and the other side anode terminal is also covered. an insulator,
A second insulator which is disposed in a region where the first insulator is not disposed in the laminated surface of the cathode terminal, and divides the region into a plurality of regions;
A multilayer solid electrolytic capacitor, further comprising: A laminated body constituted by stacking a plurality of capacitor elements in which the anode part is formed on one side and the cathode part is formed on the other side of the flat anode element made of a valve metal so that the protruding direction of the anode part is opposite;
A one-side anode terminal electrically connected to the anode portion protruding from one side of the laminate;
The other-side anode terminal electrically connected to the anode portion protruding from the other side of the laminate,
A connecting portion for electrically connecting the one side anode terminal and the other side anode terminal;
The connecting portion, the one-side anode terminal, and the other-side anode terminal are disposed apart from each other and have a rectangular laminated surface facing the laminated body, and the laminated surface is a cathode of the plurality of capacitor elements. A cathode terminal electrically connected to a cathode body comprising a portion, and a multilayer solid electrolytic capacitor comprising:
In addition to the laminated surface of the connecting portion facing the laminated body and the peripheral edge on the connecting portion side of the laminated surface of the cathode terminal, the one-side anode terminal side and the other on the laminated surface of the cathode terminal A first insulator disposed also on a peripheral edge on the side anode terminal side ;
A second insulator which is disposed in a region where the first insulator is not disposed in the laminated surface of the cathode terminal, and divides the region into a plurality of regions;
A multilayer solid electrolytic capacitor, further comprising: A laminated body constituted by stacking a plurality of capacitor elements in which the anode part is formed on one side and the cathode part is formed on the other side of the flat anode element made of a valve metal so that the protruding direction of the anode part is opposite;
A one-side anode terminal electrically connected to the anode portion protruding from one side of the laminate;
The other-side anode terminal electrically connected to the anode portion protruding from the other side of the laminate,
A connecting portion for electrically connecting the one side anode terminal and the other side anode terminal;
A cathode terminal disposed apart from the coupling portion, the one-side anode terminal, and the other-side anode terminal, and electrically connected to a cathode body comprising cathode portions of the plurality of capacitor elements. A multilayer solid electrolytic capacitor,
In addition to the stacking surface of the connecting portion facing the stacked body and the gap between the connecting portion and the cathode terminal, a first gap that covers the gap between the cathode terminal and the one side anode terminal and the other side anode terminal is also covered. Further comprising an insulator;
A multilayer solid electrolytic capacitor, wherein a plurality of irregularities are formed on a portion of the end face of the first insulator on the periphery of the cathode terminal. A laminated body constituted by stacking a plurality of capacitor elements in which the anode part is formed on one side and the cathode part is formed on the other side of the flat anode element made of a valve metal so that the protruding direction of the anode part is opposite;
A one-side anode terminal electrically connected to the anode portion protruding from one side of the laminate;
The other-side anode terminal electrically connected to the anode portion protruding from the other side of the laminate,
A connecting portion for electrically connecting the one side anode terminal and the other side anode terminal;
The connecting portion, the one-side anode terminal, and the other-side anode terminal are disposed apart from each other and have a rectangular laminated surface facing the laminated body, and the laminated surface is a cathode of the plurality of capacitor elements. A cathode terminal electrically connected to a cathode body comprising a portion, and a multilayer solid electrolytic capacitor comprising:
In addition to the laminated surface of the connecting portion facing the laminated body and the peripheral edge on the connecting portion side of the laminated surface of the cathode terminal, the one-side anode terminal side and the other on the laminated surface of the cathode terminal A first insulator disposed also on the peripheral edge of the side anode terminal side,
A multilayer solid electrolytic capacitor, wherein a plurality of irregularities are formed on a portion of the end face of the first insulator on the periphery of the cathode terminal. A laminated body constituted by stacking a plurality of capacitor elements in which the anode part is formed on one side and the cathode part is formed on the other side of the flat anode element made of a valve metal so that the protruding direction of the anode part is opposite;
A one-side anode terminal electrically connected to the anode portion protruding from one side of the laminate;
The other-side anode terminal electrically connected to the anode portion protruding from the other side of the laminate,
A connecting portion for electrically connecting the one side anode terminal and the other side anode terminal;
A cathode terminal disposed apart from the coupling portion, the one-side anode terminal, and the other-side anode terminal, and electrically connected to a cathode body comprising cathode portions of the plurality of capacitor elements. A multilayer solid electrolytic capacitor,
In addition to the stacking surface of the connecting portion facing the stacked body and the gap between the connecting portion and the cathode terminal, a first gap that covers the gap between the cathode terminal and the one side anode terminal and the other side anode terminal is also covered. Further comprising an insulator;
A multilayer solid electrolytic capacitor, wherein a flange portion is formed on a portion of the end face of the first insulator on the periphery of the cathode terminal. A laminated body constituted by stacking a plurality of capacitor elements in which the anode part is formed on one side and the cathode part is formed on the other side of the flat anode element made of a valve metal so that the protruding direction of the anode part is opposite;
A one-side anode terminal electrically connected to the anode portion protruding from one side of the laminate;
The other-side anode terminal electrically connected to the anode portion protruding from the other side of the laminate,
A connecting portion for electrically connecting the one side anode terminal and the other side anode terminal;
The connecting portion, the one-side anode terminal, and the other-side anode terminal are disposed apart from each other and have a rectangular laminated surface facing the laminated body, and the laminated surface is a cathode of the plurality of capacitor elements. A cathode terminal electrically connected to a cathode body comprising a portion, and a multilayer solid electrolytic capacitor comprising:
In addition to the laminated surface of the connecting portion facing the laminated body and the peripheral edge on the connecting portion side of the laminated surface of the cathode terminal, the one-side anode terminal side and the other on the laminated surface of the cathode terminal A first insulator disposed also on the peripheral edge of the side anode terminal side,
A multilayer solid electrolytic capacitor, wherein a flange portion is formed on a portion of the end face of the first insulator on the periphery of the cathode terminal. The multilayer solid electrolytic capacitor according to claim 5, wherein the flange portion is formed by laminating two or more first insulators. 8. The multilayer solid electrolytic capacitor according to claim 1, wherein the first insulator is disposed on the entire periphery of the laminated surface of the cathode terminal. 9.

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