JPH06176981A - Solid electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide a solid electrolytic capacitor wherein it increases the capacity of capacitor elements as lamination units and its capacity is made high by laminating the capacitor elements. CONSTITUTION:An anode body (an anode plate 2) is divided into an insulating part (a) and a capacity formation part (b), the insulating part is covered with an insulating film 4, an oxide film 6 is formed on the surface of the anode body in the capacity formation part, a second electrolyte layer 8 is formed on it, a capacitor element 12 in which a conductive layer 10 has been formed is-laminated on the solid electrolyte layer, the side of the insulating part in each capacitor element is bonded by an insulating adhesive 14 and the side of the conductive layer in the capacity formation part is bonded by a conductive adhesive 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolytic capacitor using a solid electrolyte such as an organic conductive polymer in an electrolyte layer.

[0002]

2. Description of the Related Art In this type of solid electrolytic capacitor, an anode body made of aluminum or the like is subjected to surface widening treatment by etching, and a dielectric layer is formed on the surface by electrolytic treatment. A capacitor element in which a semiconductor layer is grown to form a solid electrolyte layer is used.

[0003]

By the way, such a solid electrolytic capacitor is effective in reducing the size and weight of the electrolytic capacitor, but it is difficult to obtain the necessary capacitance because of its small size, and It is an important issue to expand.

Therefore, an object of the present invention is to provide a solid electrolytic capacitor in which the capacity of a capacitor element, which is a unit of lamination, is increased and the capacity is increased by laminating the capacitor elements.

[0005]

In the solid electrolytic capacitor of the present invention, the anode body (anode plate 2) is divided into an insulating portion (a) and a capacitance forming portion (b), and the insulating portion is an insulating film (4). ), An oxide film layer (6) is formed on the surface of the anode body in the capacitance forming portion, a solid electrolyte layer (8) is formed thereon, and a conductive layer (10) is formed on the solid electrolyte layer. ) Are laminated, an insulating adhesive (14) is provided on the insulating portion side of each capacitor element, and a conductive adhesive (16) is provided on the conductive layer side of the capacitance forming portion. It is characterized by being joined.

[0006]

According to the present invention, the anode body is divided into an insulating portion and a capacitance forming portion, an insulating film is formed in the insulating portion, and an oxide film layer is formed on the surface of the anode body in the capacitance forming portion, and the solid electrolyte is formed thereon. A layer is formed, and a conductive layer is formed on this solid electrolyte layer to form a capacitor element. That is, in this solid electrolytic capacitor, a capacitor element is formed with the anode body as a unit,
By stacking a plurality of capacitor elements and arranging them in parallel, a higher capacity is achieved. Moreover, the capacitor element, which is a laminated unit, insulates a part of the anode body, uses this for taking out the anode terminal, and uses the other part as the capacity forming portion, which has a high capacity forming rate for one anode body, Higher capacity is achieved by stacking together with higher capacity of one capacitor element.

[0007]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

1 and 2 show an embodiment of the solid electrolytic capacitor of the present invention. In this solid electrolytic capacitor, as the anode body, for example, a thin anode plate 2 having a rectangular shape is used.
Is used. The anode plate 2 is made of a film-forming metal such as aluminum foil. The surface of the anode plate 2 is surface-enlarged by electrochemical etching.

Then, the anode plate 2 is divided into an insulating portion a and a capacitance forming portion b at an appropriate ratio in the longitudinal direction, an insulating film 4 made of synthetic resin or the like is formed on the insulating portion a, and the capacitance forming portion b is formed. An oxide film layer 6 forming a dielectric is formed by chemical conversion treatment, and a solid electrolyte layer 8 made of a polymer film such as polypyrrole is formed on the surface of the oxide film layer 6 by vapor phase polymerization, chemical polymerization or electrolytic polymerization. A conductive layer 10 is formed on the surface of the solid electrolyte layer 8 for taking out a cathode terminal. The conductive layer 10 is formed by a metal film forming process such as application of a conductive adhesive, vapor deposition of metal, and plating. Therefore, the capacitor element 12 which is a laminated unit is formed on one anode plate 2.

Next, FIG. 3 shows a solid electrolytic capacitor using this capacitor element 12. The solid electrolytic capacitor of this embodiment uses three sets of capacitor elements 12, and these three sets of capacitor elements 12 have an insulating adhesive 14 and a conductive layer on the side of the insulating film 4 as shown in FIG. A conductive adhesive 16 is adhered to the 10 side to form one capacitor element 18. In this case, the conductive layers 10 of each capacitor element 12 are electrically connected with a conductive adhesive 16.

The capacitor element 18 is covered with the insulating film 4 for connection on the anode side, that is,
Cut at the portion indicated by the alternate long and short dash line L. A cutting means such as a slicer can be used for this cutting, and as a result of the cutting,
The anode plate 2 has a cut surface exposed at the end surface of the capacitor element 18. As shown in FIG. 5, a conductive layer 20 is formed on the cut end surface side of the anode plate 2 by metallikon treatment for drawing out terminals. Due to the formation of the conductive layer 20, the capacitor elements 12 are parallelized together with the electrical connection between the anode plates 2 to form one capacitor element 18.

The capacitor element 18 thus treated
3 is housed in an outer case 26 having an anode terminal 22 and a cathode terminal 24 formed on its side surface, and each anode plate 2 of the capacitor element 18 and the anode terminal 22 are subjected to ultrasonic welding or conductive bonding. The conductive layer 20 and the cathode terminal 24 are electrically connected with each other by a similar means. Then, the outer case 26 is filled with an insulating resin 28 to obtain a solid electrolytic capacitor as a product.

According to such a solid electrolytic capacitor,
A capacitor element 12 in which an oxide film layer 6, a solid electrolyte layer 8 and a conductive layer 10 are formed by setting a part of the anode plate 2 as an anode extraction part and the other part entirely as a capacity forming part b is used. Therefore, the capacitor element 1 which is a laminated unit
The capacity of 2 is increased. By stacking the capacitor elements 12, the obtained solid electrolytic capacitor has high volume efficiency, and high capacity can be expected.

Further, the anode plate 2 of each capacitor element 12 is cut, and then the conductive layer 2 is formed by metallikon treatment.
Since the connection is made with 0, the connection resistance can be reduced and a solid electrolytic capacitor with excellent characteristics can be realized.

Although the solid electrolytic capacitor of the present invention has been described through the embodiments, the modifications will be enumerated as follows.

A. Although the conductive layer 10 is formed on the solid electrolyte layer 8, a conductive adhesive 16 may be used as the conductive layer when the capacitor elements 12 are arranged in parallel. b. Although the conductive layer 20 is formed only on the anode side, a conductive layer may be formed on the cathode extraction side by the same metallikon treatment and connected to the cathode terminal. c. The anode plate 2 may be formed of a foil, which allows the capacitor elements 12 to 18 to be thin and lightweight.

[0017]

As described above, according to the present invention,
The anode body is divided into an insulating part and a capacitor forming part, an insulating film is formed on the insulating part to take out from the anode side, and an oxide film layer, a solid electrolyte layer and a conductive layer are laminated on the capacitor forming part to form a capacitor. By stacking this capacitor element as an element, it is possible to increase the capacity together with the increase in the capacity of the capacitor element which is a unit of lamination.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a capacitor element that is an embodiment of a solid electrolytic capacitor of the present invention.

2 is a perspective view of the capacitor element shown in FIG. 1. FIG.

3 is a vertical cross-sectional view showing a solid electrolytic capacitor using the capacitor element shown in FIG.

FIG. 4 is a vertical cross-sectional view showing a process of treating a capacitor element during formation of the solid electrolytic capacitor shown in FIG.

5 is a vertical cross-sectional view showing a processing step of a capacitor element in the process of forming the solid electrolytic capacitor shown in FIG.

[Explanation of symbols]

 a Insulating part b Capacitance molding part 2 Anode plate (anode body) 4 Insulating film 6 Oxide film layer 8 Solid electrolyte layer 10 Conductive layer 12 Capacitor element 14 Insulating adhesive 16 Conductive adhesive 18 Capacitor element

Claims (1)

[Claims] 1. An anode body is divided into an insulating portion and a capacitance forming portion, the insulating portion is covered with an insulating film, and an oxide film layer is formed on the surface of the anode body in the capacitance forming portion, and a solid layer is formed thereon. An electrolyte layer is formed, and a capacitor element formed by forming a conductive layer on the solid electrolyte layer is laminated, an insulating adhesive is provided on the insulating portion side of each capacitor element, and the conductive layer side of the capacitance forming portion is A solid electrolytic capacitor characterized by being bonded with a conductive adhesive.