JPH0383319A - Electric double-layer capacitor - Google Patents

Abstract

PURPOSE:To enhance breakdown strength without decreasing capacitance by laminating units having a plurality of cells which are separated other, constituting the sets of the cells which are connected in series, and providing connecting means for connecting said sets of the cells in series and in parallel at both end parts of the laminated units. CONSTITUTION:Electrodes 4 and 4 in a paste shape comprising active carbon and electrolyte are accommodated between current collectors 3 and 3 at the upper and lower surfaces. A separator 5 is arranged between two electrodes 4 and 4. In this constitution, electric charge stored in the broad surface of the porous active carbon is taken out, and a capacitor having large capacitance is obtained. Basic cells A and B are connected with a lateral conductor plate 6. Basic cells B and C are electrically connected with a longitudinal conductor plate 9. Basic cells C and D are electrically connected with a lateral conductor plate 7. The basic cells D and A are electrically connected with a longitudinal conductor plate 8. Therefore, a bridge circuit is obtained. In this constitution, breakdown strength of four times that of the basic cell is obtained. The value of the capacitance becomes equal to the value of the basic cell.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electric double layer capacitor, and more particularly to an electric double layer capacitor provided with means for easily connecting in series and in parallel.

(Prior Art) In recent years, large-capacity electric double layer capacitors that utilize the electric double layer principle have been developed as backup power sources for memories in electronic devices, and are incorporated into microcomputers and the like.

This type of electric double layer capacitor can achieve the same capacitance with a volume several tenths smaller than that of a conventional aluminum electrolytic capacitor, but because the rated voltage per unit is low, multiple electric double layer capacitors are required. are connected in series to obtain the desired working voltage.

Then, as a proposal for an electric double layer capacitor connected in series, an electric double layer capacitor was proposed in JP-A-62, in which a unit containing a plurality of cells separated from each other was housed in a case and provided with means for connecting all the cells in series. It is disclosed in Japanese Patent No.-26808.

(Problems to be Solved by the Invention) According to the proposal presented in the above-mentioned publication, it is possible to increase the withstand voltage by connecting cells in series, but when they are connected in series, the capacitance decreases and the capacitance increases. A drawback arises in that it is impossible to secure.

Therefore, in order to obtain a large capacitance, it is necessary to connect them in parallel outside the unit, which poses the problem of requiring materials and labor for the contacts, connection materials, connection methods, etc.

The present invention was made in view of such problems,
The purpose is to provide an electric double layer capacitor that can easily connect a plurality of electric double layer capacitors in series and in parallel, and that can ensure capacitance.

(Means for Solving the Problems) According to the present invention, units having a plurality of cells separated from each other are stacked to form a series-connected cell set, and both ends of the stacked units An electric double layer capacitor is provided which is provided with connection means for connecting a set of cells in series and in parallel.

(Function) In the present invention, units having a plurality of mutually insulated cells are stacked and the cells are connected in series to increase the withstand voltage to multiple times that of the cells. Since a vertically long conductive plate is placed at the top and the current collectors of the cells at the ends are connected to each other, a bridge circuit is formed with a set of cells connected in series as one side, and the capacitance is maintained without decreasing. Ru.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, FIG. 2 is a perspective view of a single unit thereof, and FIG. 3 is a sectional view taken along cutting line I-1 in FIG. 2.

First, in FIGS. 2 and 3, 1 is a unit, which is the basic cell A and B of an electric double layer capacitor.

Four cells C and D are formed into a flat plate shape by an insulating gasket 2 in the shape of a Japanese character, and the basic cells are electrically insulated from each other.

As shown in the cross-sectional view of Fig. 3, the basic cell houses a paste-like electrode 4.4 of activated carbon and electrolyte between the current collectors 3.3 on the upper and lower surfaces, and two electrodes 4.4. A separator 5 is placed between the two, and is configured to form a large capacitance capacitor by extracting the electric charge accumulated on the wide surface of the porous activated carbon. Note that instead of the above-mentioned base-like electrode, an electrode made of sintered granular carbon and impregnated with an electrolytic solution may be used.

Next, in FIG. 1, 6 and 7 are horizontally long conductive plates serving as connection means, and are made of metal plates or conductive rubber. It electrically connects the current collector plates on the top surface of the basic cells, and as shown in the figure, the horizontally long conductive plate 6 connects basic cells A and B, and the horizontally long conductive plate 7 connects basic cells D and C. It is.

Further, 8.9 is a vertically long conductive plate which serves as a connection means, and is made of the same material as the horizontally long conductive plate 6.7. Electrical connection is made by contacting the current collecting plate on the bottom surface of the , and as shown in the figure, the vertically long conductive plate 8 connects basic cells A and D, and the vertically long conductive plate 9 connects basic cells B and C. be.

In addition, the arrangement of these horizontally long conductive plates and vertically long conductive plates &:
In some cases, a gap is provided between adjacent conductive plates so that they are not electrically contacted.

In this embodiment configured in this way, four units 1
When the stacked four basic cells A are stacked, each of the current collector plates 3 on the upper and lower surfaces is in contact with the adjacent current collector, so that the four basic cells A1 to A4 are connected in series. The other basic cells B, C, and D are similarly connected in series, four each.

The upper current collectors of basic cells A and B are connected by a horizontally long conductive plate 6, and the lower current collectors of basic cells B and C are connected by a vertically long conductive plate 9. The upper current collector is electrically connected to the horizontally elongated conductor 7, and the lower current collectors of basic cells D and A are electrically connected to each other by the vertically elongated conductive plate 8, so they are equivalently shown in FIG. A capacitor connection circuit will be obtained.

Therefore, by providing leader lines on the vertically long conductive plates 8 and 9, a breakdown voltage four times that of the basic cell can be obtained, and the capacitance has a value equivalent to that of the basic cell.

As described above, an embodiment of the present invention has been described in which the unit is shaped like a Japanese character and has a quadrangular outer shape. However, within the scope of the gist of the present invention, the outer shape of the unit is circular, and the basic cell is shaped like a sector of a quarter circle. Various modifications are possible, such as forming the upper and lower X electric bodies in a half-moon shape and arranging the upper and lower parts with an angular displacement of 90', and these modifications are excluded from the scope of the present invention. It's not a thing.

(Effects of the Invention) According to the present invention, a plurality of units each having four cells insulated from each other are stacked to form a series-connected cell set, and the stacked units are assembled at both ends. Since the position of the electric body is displaced by 90' and adjacent cells at the ends are connected, a bridge circuit with one side of the above-mentioned set of cells is constructed as a whole, which is multiple times the size of a single cell. It is possible to obtain the withstand voltage of 1,000,000,000 yen, and to maintain the capacitance without decreasing it.

Further, according to the present invention, series connection and parallel connection can be easily performed by simply changing the direction of the current collectors at both ends of the unit, and there is also the advantage that connection materials and labor can be minimized. be.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is a perspective view of the single unit, Fig. 3 is a sectional view taken along cutting line II in Fig. 2, and Fig. 4 is FIG. 3 is an equivalent connection circuit diagram of this embodiment. DESCRIPTION OF SYMBOLS 1... Unit, 2... Gasket, 3... Current collector, 6.7... Horizontally long conductive plate, 8.9... Vertically long conductive plate.

Claims (1)

[Claims] Units having a plurality of cells separated from each other are stacked to form a series-connected set of cells, and
An electric double layer capacitor characterized in that connection means for connecting the above cell sets in series and in parallel are provided at both ends of the stacked units.