JP2010278203A - Laminated solid electrolytic capacitor and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated solid electrolytic capacitor in which electric short circuit between a cathode part of a capacitor element and a coupling part is prevented, and to provide a method of manufacturing the multilayered solid electrolytic capacitor. <P>SOLUTION: The laminated solid electrolytic capacitor is formed by sealing with a resin package 13 a laminate formed by stacking a plurality of capacitor elements each having anode parts 6, 6' on one side and a cathode part on the other side so that anode parts 6, 6' protrude alternately in opposite directions. The laminated solid electrolytic capacitor includes an insulator 12 arranged spreading over laminate-side surfaces of the coupling part 11 and of the cathode terminals 10, 10' so as to cover gaps between the coupling part 11 and cathode terminals 10, 10'. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a multilayer solid electrolytic capacitor and a method for manufacturing the same.

  Conventionally, a solid electrolytic capacitor has a valve action metal such as aluminum or tantalum as an anode part, an oxide film layer formed on the surface thereof as a dielectric, and a solid electrolyte layer formed on the surface of the oxide film layer to form a cathode part. A lot of things that consist of are used. As this solid electrolyte layer, manganese dioxide or the like is generally known (for example, see Patent Document 1).

  In recent years, electronic devices have been reduced in size and frequency, and solid electrolytic capacitors have been required to have low impedance in the high frequency range. Solid electrolysis using a high-conductivity conductive polymer as the solid electrolyte Capacitors have been commercialized. This solid electrolytic capacitor is used in various fields because it can achieve a lower ESR than a solid electrolytic capacitor using manganese dioxide (see, for example, Patent Document 2).

  In addition, along with the lower voltage and higher speed of CPUs used in computers and the like, when supplying electric charge from a solid electrolytic capacitor to the CPU, the solid electrolytic capacitor is required to be charged / discharged at high speed, resulting in low ESR / ESL. It is an essential condition.

  As one method for realizing the low ESR, there is a method in which a capacitor element is formed in a multilayer structure, and the number of stacked layers is increased. The laminated structure of the multilayer solid electrolytic capacitor includes a single plate capacitor element having an anode part and a cathode part made of a solid electrolyte layer, with the anode part overlapping the anode part and the cathode part overlapping each other. A structure in which a plurality of electrodes are stacked and a potential extracting lead frame is connected to each electrode is known (see, for example, Patent Document 3).

  In addition, the applicant of the present invention, as a laminated structure of a multilayer solid electrolytic capacitor, laminates flat capacitor elements alternately so that the anode part faces the center of the cathode part, and branches the anode part and the cathode part into a plurality of parts. And a structure in which a plurality of anode parts are electrically connected at the shortest distance to cancel the magnetic field and further lower the ESL (see, for example, Patent Document 4).

  In addition, as a result of conducting experiments on the terminal structure of the multilayer solid electrolytic capacitor, the present applicant has found that the ESR / ESL can be further reduced by directly connecting the anode terminals opposed to each other with a conductive member. The heading and the structure which provides the connection part which bridge-connects anode terminals with an electroconductive member are proposed (for example, refer patent document 5). Furthermore, the present applicant has also proposed a structure in which the connecting portions are arranged at the upper and lower portions of the laminate (see, for example, Patent Document 6).

Japanese Patent No. 2996992 JP 2003-45753 A JP 2000-68158 A JP 2007-1116064 A JP 2007-180327 A JP 2009-21355 A

  However, the multilayer solid electrolytic capacitors described in Patent Document 5 and Patent Document 6 described above are side surfaces of a connecting portion that connects anode terminals to each other when a cathode portion and a cathode terminal of a capacitor element are connected with a conductive adhesive. And a conductive adhesive adheres to a bottom face, and the problem of causing an electrical short circuit arises.

  The present invention has been conceived based on the above circumstances, and a multilayer solid electrolytic capacitor capable of reliably preventing an electrical short circuit between a cathode portion and a connecting portion of a capacitor element and a method for manufacturing the same The main issue is to provide

  In order to solve the above problems, the present invention employs the following technical means.

  A solid electrolytic capacitor according to the present invention is a resin package comprising a laminate in which a plurality of capacitor elements each having an anode portion on one side and a cathode portion on the other side are stacked so that the protruding directions of the anode portions are alternately reversed. A laminated solid electrolytic capacitor sealed with a one-side anode terminal electrically connected to the anode portion projecting from one side of the laminate, and the one projecting from the other side of the laminate A cathode body comprising a second anode terminal electrically connected to the anode section, a connecting section electrically connecting the first anode terminal and the second anode terminal, and a cathode section of the plurality of capacitor elements; On the surface of the stacked body side of the connecting portion and the cathode terminal so as to cover the gap between the cathode terminal that is electrically connected and spaced apart from the connecting portion, and the connecting portion and the cathode terminal. Extinction placed across Characterized in that it comprises a body, a.

  According to this configuration, since the insulator is disposed over the surface of the connection part and the cathode terminal on the laminate side so as to cover the gap between the connection part and the cathode terminal, When connecting the negative electrode body and the negative electrode terminal with a conductive adhesive, the conductive adhesive adheres to the side surface and the bottom surface of the connecting portion, thereby reliably preventing an electrical short circuit between the negative electrode body and the connecting portion. it can.

  Further, in the present invention, the connecting portion is embedded in the resin package, and the exposed surfaces of the one-side anode terminal, the other-side anode terminal, and the cathode terminal exposed from the resin package are arranged on the same plane. It is characterized by that.

  According to this configuration, a small multilayer solid electrolytic capacitor suitable for surface mounting can be provided.

  Further, according to the present invention, the one-side anode terminal and the other-side anode terminal are arranged over the entire width direction of the resin package, and the connecting portion has a constant value of 20 to 70% with respect to the width dimension of the resin package. A pair of cathode terminals having a width dimension and being symmetrical with respect to the connecting portion are arranged, and the insulator is formed between the pair of cathode terminals arranged on both sides of the connecting portion. It arrange | positions so that both clearance gaps may be covered, It is characterized by the above-mentioned.

  According to this configuration, it is possible to prevent an electrical short circuit caused by the adhesion of the conductive adhesive to the side surface and the bottom surface of the connecting portion while maintaining low ESR.

  Furthermore, the present invention is characterized in that, in the above configuration, the insulator is an insulating tape, an insulating film, or an insulating sheet.

  According to this configuration, the insulator can always be formed with a constant thickness, and can be easily disposed across the connecting portion and the cathode terminal.

  Furthermore, the method for manufacturing a solid electrolytic capacitor according to the present invention includes a laminate in which a plurality of capacitor elements each having an anode part on one side and a cathode part on the other side are stacked so that the protruding directions of the anode part are alternately reversed. Is a method for manufacturing a multilayer solid electrolytic capacitor, which is sealed with a resin package, and electrically connects one side anode terminal, the other side anode terminal, the one side anode terminal and the other side anode terminal. Disposing an insulator made of an insulating tape, an insulating film, or an insulating sheet on a lead frame including a connecting portion and a cathode terminal spaced apart from the connecting portion so as to cover a gap between the connecting portion and the cathode terminal. And the anode part protruding from one side of the laminate is electrically connected to the one side anode terminal, and the anode part protruding from the other side of the laminate is connected to the other side anode terminal. Arranging the laminate on the insulator such that the cathode body is electrically connected and the cathode body comprising the cathode portions of the plurality of capacitor elements is electrically connected to the cathode terminal. Features.

  According to this configuration, it is possible to easily dispose the insulator across the connecting portion and the cathode terminal, and reliably prevent the conductive adhesive from adhering to the side surface and the bottom surface of the connecting portion in the subsequent process. I can do things.

  According to the multilayer solid electrolytic capacitor and the manufacturing method thereof according to the present invention, it is possible to reliably prevent an electrical short circuit between the cathode portion and the connecting portion of the capacitor element.

BRIEF DESCRIPTION OF THE DRAWINGS It is a capacitor | condenser element used with the multilayer solid electrolytic capacitor which concerns on this invention, Comprising: (a) is a top view, (b) is sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is a laminated body used with the laminated solid electrolytic capacitor which concerns on this invention, Comprising: (a) is a top view, (b) is a side view, (c) is a side surface which shows the state which has arrange | positioned the laminated body to a lead frame. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a lead frame used with the multilayer solid electrolytic capacitor which concerns on this invention, Comprising: (a) is a top view, (b) is a top view which shows the state which has arrange | positioned the insulator. 1A is a plan view, FIG. 2B is a cross-sectional view taken along line A, and FIG. 3C is a cross-sectional view taken along line B. FIG. It is. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a multilayer solid electrolytic capacitor according to the present invention, wherein (a) is a bottom view and (b) is a side view. It is a graph which shows the relationship between the ratio of the width | variety of a connection part with respect to the width | variety of the resin package of the multilayer solid electrolytic capacitor which concerns on this invention, and ESR. It is a top view which shows the modification of the lead frame used with the multilayer solid electrolytic capacitor which concerns on this invention. It is a top view which shows the lead frame used with the multilayer type solid electrolytic capacitor of a prior art example.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  First, the capacitor element according to the present invention will be described below.

  FIG. 1A is a top view of a capacitor element used in the multilayer solid electrolytic capacitor according to the present invention, and FIG. The capacitor element C according to the present invention includes an anode element 1, a dielectric film 2, a solid electrolyte layer 3, a carbon layer 4, a silver layer 5, an anode portion 6, and a creeping prevention material 7.

  The anode element 1 is a flat thin plate having a width (w) of 10 mm and a length (l) of 15 mm, which is made of a valve metal having aluminum as a main component. One end of the anode element 1 constitutes an anode portion 6. The dielectric film 2 is an oxide film layer formed on the surface of the anode element 1. The solid electrolyte layer 3 is formed on the surface of the dielectric film 2, for example, a layer formed by chemical polymerization, electrolytic polymerization, or electrolyte impregnation of an electrolyte containing a conductive polymer such as polyethylenedioxythiophene (PEDT). is there. The carbon layer 4 and the silver layer 5 are cathode lead layers sequentially formed on the surface of the solid electrolyte layer 3. The creeping prevention material 7 is a film provided between the anode portion 6 and the solid electrolyte layer 3 and formed in a ring shape that insulates and isolates the anode portion 6 and the solid electrolyte layer 3.

  Next, an example of a method for manufacturing a capacitor element according to the present invention is shown below.

  The anode element 1 made of a long aluminum foil 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. Then, the dielectric film 2 which is an oxide film layer is formed. Next, after the anode element 1 on which the dielectric film 2 is formed is cut into a width (w) of 10 mm and a length (l) of 15 mm, an insulating resin is wound around an appropriate position in the circumferential direction. Thus, the scooping prevention material 7 is formed and divided into a region to be the anode portion 6 and a region to be the cathode portion. Subsequently, the end face portion where the anode element 1 is exposed by the cutting is again subjected to an anodic oxidation treatment by applying a voltage of 7 V in an aqueous solution of ammonium adipate for about 30 minutes to form the dielectric film 2 on the cut surface. . Thereafter, a solid electrolyte layer 3, a carbon layer 4, and a silver layer 5 are sequentially formed on the surface of the dielectric film 2 to constitute a cathode portion.

  Next, a method for producing a multilayer solid electrolytic capacitor constructed by laminating the capacitor element C will be described below.

  FIGS. 2A and 2B are a plan view and a side view of a laminated body in which four capacitor elements C1, C2, C3, and C4 manufactured by the above method are stacked, and FIG. 2C includes a terminal member. It is a side view of the state which has arranged the layered product on a lead frame.

  The laminated body is formed by laminating capacitor elements C1, C2, C3, and C4 so that the protruding directions of the anode portions 6 and 6 ′ are alternately opposite, and the cathode portions are connected to each other by the conductive adhesive 8 (hereinafter, a plurality of the plurality of capacitor elements C1 to C4) The cathode part of the capacitor element is collectively referred to as “cathode body”). Next, the anode parts 6 and 6 ′ on both sides of the laminate are connected to the anode terminals 9 and 9 ′ by a method such as resistance welding, and the central cathode body and the cathode terminal 10 are connected via the conductive adhesive 8. And join. Subsequently, the entire laminate is molded with the resin package 13 except for only the connection surfaces of the anode terminals 9 and 9 ′ and the cathode terminal 10 to the external circuit, so that a finished product is obtained. The anode terminals 9, 9 'and the cathode terminal 10 are made of a copper-based alloy.

  Next, examples of the present invention will be described below.

Example 1
FIG. 3A is a plan view of a lead frame used in the multilayer solid electrolytic capacitor according to the present invention, and FIG. 3B is a plan view of an insulator disposed on the lead frame. 4A is a plan view showing the state in which the laminate is disposed on the lead frame, FIG. 4B is a cross-sectional view taken along line A in FIG. 4A, and FIG. 4C is cut along line B in FIG. It is sectional drawing. FIG. 5A is a bottom view of the multilayer solid electrolytic capacitor according to the present invention sealed with a resin package, and FIG. 5B is a side view.

  As shown in FIG. 3, the multilayer solid electrolytic capacitor according to the present invention has an insulator 12 disposed on a lead frame. Then, the laminate produced by the above method is arranged on the insulator 12 as shown in FIG. 4, and as shown in FIG. 5, the external circuits of the anode terminals 9 and 9 ′ and the cathode terminals 10 and 10 ′ The entire laminate is molded with the resin package 13 except for the connection surface, and a finished product is obtained.

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

  The anode terminals 9 and 9 ′ are arranged over the entire width direction of the resin package 13, and are connected to the anode portions 6 and 6 ′ of the laminate by resistance welding. The anode terminals 9 and 9 ′ are connected by a connecting portion 11 made of the same material as the anode terminals 9 and 9 ′ (for example, a copper alloy) and having a length of 12.6 mm. In the present embodiment, an H-shaped lead frame in which the anode terminals 9, 9 'and the connecting portion 11 are integrated is used. As shown in FIGS. 4B and 4C, the cross section of the H-shaped lead frame is such that the anode terminals 9 and 9 'at both ends are thick and the connecting portion 11 is thin. Since the connecting portion 11 is embedded in the resin package 13, the anode terminals 9, 9 ′ and the connecting portion 11 are not easily removed from the resin package 13.

  Each of the cathode terminals 10 and 10 ′ has dimensions of a width (c) of 4.34 mm and a length (d) of 4.3 mm. It is arranged with (g) and is connected to a cathode body composed of cathode portions of a plurality of capacitor elements by a conductive adhesive 8 such as a silver paste. The cathode terminals 10 and 10 ′ and the anode terminals 9 and 9 ′ are arranged so that the exposed surfaces from the resin package 13 are on the same plane.

  The connecting portion 11 is arranged so that the width (a) thereof is 20% of the width (W) of the resin package 13 and the anode terminals 9 and 9 'are connected in the shortest distance.

  When the insulator 12 connects the cathode body composed of the cathode portions of the plurality of capacitor elements and the cathode terminals 10 and 10 'with the conductive adhesive 8, the conductive adhesive 8 is connected between the anode terminals 9 and 9'. In order to prevent the electrical connection between the connecting portion 11 and the bottom surface of the connecting portion 11 to be connected and electrical short-circuiting, the connecting portion 11 and the cathode terminals 10 and 10 ′ are disposed across the laminate side surface. The insulator 12 is preferably an insulating tape, an insulating film, or an insulating sheet. In the present embodiment, as shown in FIG. 3B, the insulator 12 is made of polyimide tape having a length of 12.6 mm, the entire surface of the connecting portion 11 on the laminated body side, and the connecting portion 11 side of the cathode terminals 10, 10 ′. Covers the width of 0.5 mm.

  Next, the merit of the manufacturing process of using an insulating tape, an insulating film, or an insulating sheet as the insulator 12 is shown below.

  The method for manufacturing a multilayer solid electrolytic capacitor according to the present invention includes a step of stacking a plurality of capacitor elements to produce a laminate, a step of arranging a lead frame, and a step of arranging an insulator 12 on the lead frame. And a step of arranging the laminate on a lead frame on which the insulator 12 is arranged, and a step of sealing the laminate with a resin package 13.

  In the step of disposing the insulator on the lead frame, for example, when a liquid resin such as silicon or Teflon (registered trademark) is used as the insulator, the gap is formed in the gap between the cathode terminals 10, 10 ′ and the connecting portion 11. The liquid resin flows in, and it is very difficult to dispose the insulator across the cathode terminals 10, 10 ′ and the connecting portion 11.

  Further, it may be possible to prevent electrical short-circuiting by wrapping the entire connecting portion 11 with an insulator, but the side surface of the connecting portion 11 is thin and difficult to cover with an insulator, and the lower surface (laminated layer) If the surface opposite to the body side is covered with an insulator, when the resin package 13 is sealed, there is a problem that the resin for packaging does not spread to the lower surface of the connecting portion 11 and the formation becomes insufficient.

  On the other hand, in the present invention, since the insulator 12 in a solid state such as an insulating tape, an insulating film, or an insulating sheet is used in the step of disposing the insulator on the lead frame, the cathode terminals 10, 10 ′ and the connecting portion 11 can be easily used. It is possible to dispose the insulator 12 across. Therefore, when connecting the cathode body composed of the cathode portions of the plurality of capacitor elements and the cathode terminals 10, 10 ′ with the conductive adhesive 8, the conductive adhesive 8 adheres to the side surface and the bottom surface of the connecting portion 11. , Can prevent electrical short circuit.

(Example 2)
In the same configuration as in the first embodiment, the entire surface of the connecting portion 11 on the laminate side (hereinafter referred to as the upper surface of the connecting portion 11) and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10, 10 ′. Was covered with a polyimide tape having a length of 12.6 mm as the insulator 12, and a multilayer solid electrolytic capacitor having a structure in which the proportion of the width of the connecting portion 11 was 30% was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 3.735 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Example 3)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and a portion having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as the insulator 12 and a polyimide having a length of 12.6 mm. A multilayer solid electrolytic capacitor having a structure in which the proportion of the width of the connecting portion 11 was 40% was covered with a tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 3.130 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

Example 4
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and a portion having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as the insulator 12 and a polyimide having a length of 12.6 mm. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 50% was produced by covering with tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 2.525 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Example 5)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and a portion having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as the insulator 12 and a polyimide having a length of 12.6 mm. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 60% was produced by covering with tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 1.920 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Example 6)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and a portion having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as the insulator 12 and a polyimide having a length of 12.6 mm. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was set to 70% was covered with a tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 1.315 mm and a length (d) of 4.3 mm, and is 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Example 7)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as insulators 12 and 12.6 mm long Teflon. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 20% was covered with a tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 4.340 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Example 8)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as insulators 12 and 12.6 mm long Teflon. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 30% was produced by covering with tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 3.735 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

Example 9
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as insulators 12 and 12.6 mm long Teflon. A multilayer solid electrolytic capacitor having a structure in which the proportion of the width of the connecting portion 11 was 40% was covered with a tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 3.130 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Example 10)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as insulators 12 and 12.6 mm long Teflon. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 50% was produced by covering with tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 2.525 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Example 11)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as insulators 12 and 12.6 mm long Teflon. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 60% was produced by covering with tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 1.920 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Example 12)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as insulators 12 and 12.6 mm long Teflon. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was set to 70% was covered with a tape. However, each of the cathode terminals 10 and 10 ′ has dimensions of a width (c) of 1.315 mm and a length (d) of 4.3 mm. They are spaced apart.

(Comparative Example 1)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and a portion having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as the insulator 12 and a polyimide having a length of 12.6 mm. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 10% was covered with a tape. However, each of the cathode terminals 10 and 10 'has a width (c) of 4.945 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Comparative Example 2)
In the same configuration as that of the first embodiment, the entire upper surface of the connecting portion 11 and a portion having a width of 0.5 mm from the connecting portion 11 side of the two cathode terminals 10 and 10 ′ are used as the insulator 12 and a polyimide having a length of 12.6 mm. A multilayer solid electrolytic capacitor having a structure in which the ratio of the width of the connecting portion 11 was 80% was covered with a tape. However, each of the cathode terminals 10, 10 ′ has a width (c) of 0.710 mm and a length (d) of 4.3 mm, and is symmetrical with respect to the connecting portion 11 so as to be 0.5 mm from the connecting portion 11. They are spaced apart.

(Conventional example 1)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ′, and the width ratio of the connecting portion 11 is 10%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 4.945 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Conventional example 2)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ′, and the ratio of the width of the connecting portion 11 is 20%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 4.340 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Conventional example 3)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ', and the proportion of the width of the connecting portion 11 is 30%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 3.735 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Conventional example 4)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ′, and the width ratio of the connecting portion 11 is 40%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 3.130 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Conventional example 5)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ′, and the width ratio of the connecting portion 11 is 50%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 2.525 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Conventional example 6)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ′, and the ratio of the width of the connecting portion 11 is 60%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 1.920 mm and a length (d) of 4.3 mm. The cathode terminals 10 and 10' are symmetrical about the connection part 11 and 0.5 mm from the connection part 11. They are spaced apart.

(Conventional example 7)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ', and the proportion of the width of the connecting portion 11 is 70%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10 and 10 'has a width (c) of 1.315 mm and a length (d) of 4.3 mm, and is 0.5 mm from the connecting portion 11 in line symmetry with the connecting portion 11 in between. They are spaced apart.

(Conventional example 8)
In the same configuration as in Example 1, as shown in FIG. 8, only the upper surface of the connecting portion 11 is covered with a polyimide tape having a length of 12.6 mm as an insulator 12 ′, and the ratio of the width of the connecting portion 11 is 80%. A multilayer solid electrolytic capacitor having the above structure was produced. However, each of the cathode terminals 10, 10 ′ has a width (c) of 0.710 mm and a length (d) of 4.3 mm, and is symmetrical with respect to the connecting portion 11 so as to be 0.5 mm from the connecting portion 11. They are spaced apart.

  In Examples 1 to 12, Comparative Examples 1 and 2, and Conventional Examples 1 to 8, stacked solid electrolysis having a rating of 2.5 V to 1200 μF, L dimension: 16 mm, W dimension: 12 mm, and H dimension: 2.5 mm, respectively. A capacitor was produced.

Table 1 is a table showing the short-circuit occurrence rate and ESR of the multilayer solid electrolytic capacitors of Examples 1 to 12, Comparative Examples 1 and 2, and Conventional Examples 1 to 8. FIG. 6 is a graph showing the relationship between the ESR and the ratio of the width of the connecting portions of the stacked solid electrolytic capacitors of Examples 1 to 6 and Comparative Examples 1 and 2. The short-circuit occurrence rate is expressed by the following formula.
Short-circuit occurrence rate = (number of short-circuit defects / number of devices in progress) × 100
The ESR is measured at 100 KHz under the condition that the anodes of the land patterns of the substrate to be mounted are not connected so that a direct current passes only through the connecting portion.

  As shown in Table 1, when Examples 1 to 12, Comparative Examples 1 to 2 and Conventional Examples 1 to 8 have the same proportion of the width of the connecting portion 11 (for example, Example 1 and Conventional Example 2), In Examples 1-12 and Comparative Examples 1-2, the occurrence rate of short circuit was greatly reduced. This is because the entire upper surface of the connecting portion 11 and the 0.5 mm width portion of the cathode terminals 10 and 10 ′ are covered with an insulator 12, thereby forming a cathode body composed of cathode portions of a plurality of capacitor elements and the cathode terminals 10 and 10 ′. This is because an electrical short circuit with the connecting portion 11 caused by the protrusion of the conductive adhesive 8 to the side surface and the bottom surface of the connecting portion 11 can be surely prevented when the conductive adhesive 8 is connected.

  Moreover, as shown in Table 1 and FIG. 6, in the laminated solid electrolytic capacitors in which the width of the connecting portion 11 is 20 to 70% (Examples 1 to 12, Conventional Examples 2 to 7), the width of the connecting portion 11 is 10%. Compared with the 80% multilayer solid electrolytic capacitors (Comparative Examples 1 and 2, Conventional Examples 1 and 8), ESR was greatly reduced. Therefore, the width of the connecting portion 11 is more preferably 20 to 70%.

  In Examples 1 to 12, the entire upper surface of the connecting portion 11 and the portions having a width of 0.5 mm from the connecting portion 11 side of the cathode terminals 10 and 10 ′ were covered with the insulator 12. If the gap between 10 'is completely covered, the portion covering cathode terminal 10, 10' may be 0.5 mm or less.

  Moreover, in Examples 1-12, although the insulator 12 of the length of 12.6 mm which is the same length as the connection part 11 was used, the insulator 12 is the length of the cathode body which consists of the cathode part of a several capacitor | condenser element. Any length can be arbitrarily changed. For example, as shown in FIG. 7, at least a part of the anode terminal 9, 9 ′ on the connecting part 11 side excluding a part connected to the anode part 6, 6 ′ may be covered with an insulator 12. According to this configuration, since the four corners of the insulator 12 are disposed and fixed on the anode terminals 9 and 9 ′, the shape of the insulator 12 is not easily deformed when sealed with the resin package 13, and the shape is stabilized.

  In Examples 1 to 12, polyimide tape and Teflon tape were used as the insulator 12, but insulating tape materials such as glass fiber tape, polypropylene tape, polyethylene terephthalate tape, polytetrafluoroethylene tape, and polyester tape may be used. The same effect can be obtained with an insulating material such as a conductive resin.

  In Examples 1 to 12, although aluminum was used as the valve action metal, the same effect can be obtained by using tantalum, niobium foil, or a sintered body of these metal powders.

  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, in Examples 1 to 12, the cathode terminals 10 and 10 ′ were divided into two parts, a gap was provided between them, and the connecting part 11 was disposed in the gap. However, the cathode terminals 10 and 10 ′ and the anode terminal 9 were provided. , 9 may not be aligned at the same height, the connecting portion 11 may be disposed along the surface of the cathode terminals 10, 10 ′. However, when the lower surfaces of the cathode terminals 10 and 10 'and the anode terminals 9 and 9' are arranged at the same height, it is convenient to mount the multilayer solid electrolytic capacitor on a mother board or an IC substrate.

  Further, a connecting portion may be provided between the cathode terminals 10 and 10 'so as to intersect with the connecting portion 11 between the anode terminals 9 and 9', or the connecting portion 11 between the anode terminals 9 and 9 'is connected to the cathode. You may arrange | position in the center of terminal 10, 10 ', and may arrange | position near one side. Further, two or more connecting portions 11 between the anode terminals 9 and 9 ′ may be provided, and a cathode terminal may be provided between them. In this case, it is necessary to install an insulator that covers the gaps between all the cathode terminals and the connecting portions. Moreover, when the width of a connection part is two or more, it is set as the sum total of the width of a connection part.

  Furthermore, as a terminal member joined to the laminate, an insulating substrate provided with a through hole (conductive terminal hole) connected to an external circuit or a conductive layer may be used instead of the lead frame.

  Moreover, in Examples 1-12, although the conductive polymer was used as the solid electrolyte layer 3, the same effect is acquired even if it uses manganese dioxide.

  In Examples 1 to 12, an example in which four capacitor elements are stacked has been described. However, if two or more capacitor elements are used, the same effect can be obtained regardless of the number of stacked layers. Moreover, although it was set as 3 terminals in Examples 1-12, even if it increases the number of terminals, the same effect is acquired.

  In the first to twelfth embodiments, the example in which the lead frame is disposed on the lower side of the multilayer body has been described. However, the lead frame may be disposed on the upper surface of the multilayer body depending on the portion where the capacitor is mounted.

C, C1, C2, C3, C4 Capacitor element 1 Anode element 2 Dielectric film 3 Solid electrolyte layer 4 Carbon layer 5 Silver layer 6, 6 ′ Anode portion 7 Scooping prevention material 8 Conductive adhesive 9, 9 ′ Anode terminal 10, 10 'Cathode terminal 11 Connecting portion 12, 12' Insulator 13 Resin package

Claims (5)

A laminated solid comprising a laminate in which a plurality of capacitor elements each having an anode portion on one side and a cathode portion on the other side are stacked in such a manner that the protruding directions of the anode portions are alternately opposite to each other are sealed with a resin package An electrolytic capacitor,
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 that is electrically connected to a cathode body composed of cathode portions of the plurality of capacitor elements and is spaced apart from the connecting portion;
An insulator disposed across the surface of the connection part and the cathode terminal on the laminate side so as to cover a gap between the connection part and the cathode terminal;
A multilayer solid electrolytic capacitor comprising: The connecting portion is embedded in the resin package,
2. The multilayer solid electrolytic capacitor according to claim 1, wherein the exposed surfaces of the one-side anode terminal, the other-side anode terminal, and the cathode terminal exposed from the resin package are arranged on the same plane. The one side anode terminal and the other side anode terminal are arranged over the entire width direction of the resin package,
The connecting portion has a constant width dimension of 20 to 70% with respect to the width dimension of the resin package;
A pair of the cathode terminals are arranged symmetrically with respect to the connecting portion,
The laminated body according to claim 1 or 2, wherein the insulator is disposed so as to cover both gaps formed between the pair of cathode terminals disposed on both sides of the connecting portion. Type solid electrolytic capacitor.   The multilayer solid electrolytic capacitor according to claim 1, wherein the insulator is an insulating tape, an insulating film, or an insulating sheet. A laminated solid comprising a laminate in which a plurality of capacitor elements each having an anode portion on one side and a cathode portion on the other side are stacked in such a manner that the protruding directions of the anode portions are alternately opposite to each other are sealed with a resin package An electrolytic capacitor manufacturing method comprising:
A lead frame including one side anode terminal, the other side anode terminal, a connection part for electrically connecting the one side anode terminal and the other side anode terminal, and a cathode terminal spaced apart from the connection part; A step of disposing an insulating tape, an insulating film or an insulating sheet so as to cover a gap between the cathode terminal;
The anode part protruding from one side of the laminate is electrically connected to the one side anode terminal, and the anode part protruding from the other side of the laminate is electrically connected to the other side anode terminal, Arranging the laminate on the insulator so that a cathode body composed of cathode portions of the plurality of capacitor elements is electrically connected to the cathode terminal;
A method for producing a multilayer solid electrolytic capacitor, comprising:

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