JPS60225417A - Electric double layer capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an electric double layer capacitor, and particularly to a casing structure of an electric double layer capacitor element laminate.

(Prior art) As one method for obtaining a large capacity capacitor by utilizing the electric double layer phenomenon, as disclosed in U.S. Pat. No. 3,536,963, carbon powder is brought into contact with an electrolytic solution. There are some methods that utilize the generation of an electric double layer.

FIG. 1 is a sectional view of an example of a conventional electric double layer capacitor. In the wC1 figure, l and 2 are a top cover and a bottom plate made of an elastic material having conductivity (e.g. conductive rubber);
3 is a carbon paste electrode made of activated carbon powder and an electrolyte solution (e.g. sulfuric acid aqueous solution), 4 is an ion-permeable, non-conductive porous separator, and 5 is an f'L electrode made of an electrically insulating elastic material (e.g. rubber). side wall side wall ru.

Therefore, the above-mentioned top cover 1 and bottom plate 2 serve as the electrodes of the capacitor. However, in the electric double layer capacitor having this structure, the withstand voltage as a capacitor is controlled by the electrolytic voltage of the electrolyte solution, so in order to obtain a capacitor with a high withstand voltage, the above-mentioned capacitors are stacked and connected in series to form a multilayer type capacitor.

FIG. 2 is a sectional view of an example of a laminated electric double capacitor. In FIG. 2, 6 represents the single electric double layer capacitor (hereinafter referred to as basic cell) shown in FIG. 1, and n represents the number of layers of basic cells 6 required to achieve the required withstand voltage.

In the above-described laminated structure, the contact resistance between the basic cells 6 and the contact resistance between activated carbon particles within the basic cells 6 becomes large, and the internal resistance becomes large as a whole. The ninth K, which prevents an increase in internal resistance, applies appropriate pressure to the top and bottom surfaces of the laminate.
It is necessary to carry out a cage to maintain that pressure.

Figure fs3 is a sectional view showing the casing structure of a conventional self-supporting electric double layer capacitor. As shown in Figure 3, the first
While pressing the electrode plate 7 of the basic cell 6 through the resin insulation case 8 and the electrode plate 9 of $2, the upper end of the metallic exterior case 1o is bent inward and caulked. However, this conventional casing structure has (a) a lead wire structure in which the terminal electrodes protrude, making it difficult to provide a chip-shaped electric double layer capacitor. (b) There is a drawback that the height of the capacitor is high compared to the demand for lower height when mounted on a board.

(Object of the Invention) An object of the present invention is to provide an electric double layer capacitor having a cage structure that eliminates the conventional drawbacks.

(Structure of the Invention) According to the present invention, the rt7 is vertically separated via an ion-permeable and non-electronically conductive porous separator, and a pair of mixed electrode layers are disposed one above the other in close contact with the mixed electrode layer. around the ion-impermeable conductive separator and the mixed electrode layer.
and a laminate formed by laminating an electric double layer capacitor element made of a non-conductive gasket interposed between a conductive upper pallet is arranged in parallel on a conductive plate, and the laminate and the conductive plate are laminated. A pair of reinforcing plates each having electrical conductivity are placed on the outside of the upper part of the body while maintaining electrical insulation, and an electrode plate placed on the reinforcing plates and the reinforcing plates has a rectangular cross section. An electric double capacitor characterized in that it has a structure in which the insulating coating f'L7'h is stored in the plate body by caulking the plate ends in a pressurized state f'. Further, an electric double layer capacitor is obtained, which is characterized in that the width of the stacked electrode plates in the direction in which they are arranged is changed.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 4 and 5.

[Embodiment 1] As shown in FIG. 4, a laminate 11 in which a required number of basic cells 6 are stacked is formed to have the same structure as that of the conventional example shown in FIGS. 2 and 3 described above. A reinforcing plate 12 made of conductive metal is arranged at one end, that is, the upper part of this laminate 11, and the reinforcing plate 12 is placed at the center so that it contacts the outside of the reinforcing plate, that is, the surface opposite to the surface that is in contact with the upper end of the laminate 11. A convex portion 13m is provided on the electrode plate 13 such as a nine iron plate. Next, a pair of laminates 11 are placed in parallel on a conductive metal plate 14. At this time - 10,000 electrodes 13L, reinforcing plates 12L, p and laminate 11
L is another electrode plate 13B, reinforcing plate 12R0 and laminate 1
A layer of insulating material such as synthetic resin is provided in between to maintain a space that does not cause electrical short-circuit contact. For example, if a laminate 11 in which three basic cells 6 are stacked in series is placed in parallel on a conductive metal plate 14, the conventional casing in which six basic cells 6 are stacked in series will be removed. A capacitor with the same breakdown voltage as a capacitor with the same structure can be obtained. In other words, a capacitor with the same breakdown voltage can be obtained with half the stacking height.

As mentioned above, it is necessary to maintain a predetermined pressing force on the laminate 11 in order to obtain various properties of this electric double layer capacitor as a capacitor. For this purpose, for example, the left and right ends of a metal plate 15 having a U-shaped cross section and having an insulating layer of synthetic resin or the like on its inner surface are bent inward while being pressurized using a known pressure means (not shown) such as a hand press. It is fixed while maintaining the applied pressure to form a good electric double layer capacitor.

[Example 2] Most of the structure was formed the same as in Example 1, and part of the width of the electrode plate 13 in the longitudinal direction (electrode plate 13L) was replaced by the other (electrode plate).
3R) Change the location by making it wider. By using such a configuration pressure, there is an advantage that the polarity can be automatically determined by a sensor such as a charging switch.

In addition, B) A structure may be adopted in which no insulating layer is provided on the outside of the plate.

(b) A structure may be adopted in which an insulating layer is provided on one piece of the conductive plate.

→ If sufficient insulation II is provided on only one side of the conductive plate, it is possible to use a plate that is not covered with an insulating layer.

(b) The electrodes, reinforcing plates, and plate bodies may be made of any material that has the desired electrical conductivity and strength, even if it is metal.

(e) The entire electrode may be covered with a curable resin such as epoxy resin, leaving a part of the electrode, that is, the electrical contact surface.

(Effects of the Invention) As described above, the electric double layer capacitor according to the present invention has the following effects.

(1) The terminal electrode is shaped like a flat plate, and there is no need to provide a through hole for inserting the lead wire on the board of the actual equipment.

(1) The height of the capacitor when mounted on the board is reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a basic cell of a conventional electric double layer capacitor. 21st! II is a cross-sectional view of a multilayer electric double layer capacitor. FIG. 3 is a sectional view showing the state of a conventional electric double layer capacitor after casing. Figure 4 and! Figure S is a perspective view and a sectional view showing an electric double layer capacitor according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...-Top lid, 2...ffi plate, 3--Carbon paste electrode, 4...Porous separator, 5...Side wall 16... ...basic cell,
7...First electrode plate, 8...Insulating case, 9...Second electrode plate, 10---Exterior case, 11. IIL, IIR...laminate, 1
2゜12L, 12R-...Reinforcement plate, 13...
...Electrode plate, 14...Metal plate, 15...
・Plate body. Me/Figure? figure

Claims (2)

[Claims] (1) nine pairs of mixed electrode layers vertically separated via an ion-permeable, non-electronically conductive porous separator; A laminate comprising a conductive separator and an electric double layer capacitor element made of a non-conductive gasket interposed between the conductive separator and around the mixed electrode layer is placed on a conductive plate. A pair of reinforcing plates having conductivity are arranged in parallel and are disposed on the outer side of the laminate, the conductive plate, and the top of the laminate, respectively, while maintaining electrical insulation, and a pair of reinforcing plates are placed on the top of the reinforcing plate. An electric double layer capacitor having a structure in which a placed electrode plate is housed in an insulating coated plate body having a rectangular cross section with the plate ends caulked under pressure. (2) The flexible electric double layer capacitor as set forth in claim 1, wherein the width of the electrode plates in the direction in which the stacked bodies are arranged is changed.