JPH0544812B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric double layer capacitor in which a plurality of single cells are stacked and housed in an outer case.

<Conventional technology> The basic structure of electric double layer capacitors is
As shown in the figure, in order to ensure voltage resistance, a plurality of single cells 1 are stacked and connected in series, and this single cell group and a pair of terminal boards 3 and 4 with an insulating plate 2 in between are connected.
are stacked and stored in a metal exterior case 5, the open end of the exterior case 5 is bent inward and connected to one terminal board 4, and the lead terminals 6, 7 of both terminal boards 3, 4 are inserted into the exterior case. It is formed by being drawn out to the outside of 5.

For electric double layer capacitors like the one above, the withstand voltage is the number of single cells x the withstand voltage of a single cell.
The capacity decreases in proportion to the reciprocal of the number of stacked single cells.

<Problems to be Solved by the Invention> By the way, as mentioned above, conventional electric double layer capacitors have a two-terminal structure and can only be used with one type of voltage and capacity. For example, if a low voltage is acceptable but a large capacity is required, another electric double layer capacitor must be prepared to meet this requirement, and therefore many types of capacitors with different numbers of stacked single cells must be prepared. The problem is that it requires

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide an electric double layer capacitor that has a single structure and allows free selection of voltage and capacity.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention interposes an extraction electrode between the single cells housed in series in an exterior case, and provides conduction to the extraction electrode. The pull-out lead terminal is drawn out to the outside of the exterior case.

<Function> The lead terminals at both ends of the laminated single cell and the lead terminals of the extraction electrodes interposed between the single cells are drawn out from the exterior case, and by selecting the lead terminal to be used, the laminated single cell The number changes to obtain the required voltage and capacity.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 7 of the accompanying drawings.

As shown in FIG.
The open end of the outer case 5 is bent inward with the pair of terminal plates 3 and 4 sandwiching the insulating plate 2 sandwiched between the single cell at the end of the outer case 5 located on the opening side. ing.

One terminal board 3 is electrically connected to one end of a group of single cells and has a positive potential, and the lead terminal 6 is drawn out from the center to the outside of the exterior case 5. A lead terminal 7 is provided which has a negative potential connected to the group and protrudes to the outside of the case 5.

In the illustrated case, the extraction electrode 8 is interposed between each single cell 1, and is connected from each extraction electrode 8 to the outer case 5.
The outer case 5 of the pull-out terminal 9 that is pulled out to the outside of the
The inner portion 9a is disposed so as to pass through the gap between the insulating material 10 provided along the inner circumference of the outer case 5 and the single cell group.
The outer peripheral surface of a is coated with an insulating material so that there is no problem even if it comes into contact with the single cell 1 or other extraction electrodes 8.

The portion of the pullout terminal 9 that protrudes from the exterior case 5 is arranged to surround the center lead terminal 6 of the terminal board 3, for example, as shown in FIG.

FIG. 4 shows an equivalent circuit of the electric double layer capacitor assembled as described above, and it can be seen that the combination of lead terminals 6, 7 and lead terminals 9 to be used can be freely selected.

Figure 6 shows the relationship between the number of single cells and capacity when 10F, 1V single cells are stacked, and Figure 7 shows the relationship between withstand voltage in the same case.
Single cell 1 by combining 7 and drawer lead terminal 9
It can be seen that by selecting the number of used, the desired capacity and withstand voltage can be obtained.

Also, by connecting the lead terminal 9b of the positive potential lead terminal 6 and the lead terminal 9 shown in FIG. 4, and using the lead terminal 9c,
If you connect it so that it becomes the equivalent circuit shown in Figure 5, the single cell 1
They can also be connected in parallel to increase capacity.

<Effects> As described above, according to the present invention, in an electric double layer capacitor in which a plurality of single cells are stacked in series and housed in an exterior case, an extraction electrode is interposed between the single cells. Since the lead terminals that conduct to the lead electrodes are drawn out to the outside of the exterior case, the number of connected single cells can be freely selected by selecting the use of lead terminals, and the desired capacity and capacity can be achieved with a single structure. Withstand voltage can be obtained.

In addition, since various capacities and withstand voltages can be obtained with a single structure, the number of types of capacitors can be reduced.
Product management becomes easier.

Furthermore, by selecting the use of lead terminals, single cells can be connected in parallel to form a capacitor with a large capacity.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an electric double layer capacitor according to the present invention, Fig. 2 is an exploded perspective view with a single cell and extraction electrodes removed, Fig. 3 is a bottom view showing the arrangement of lead terminals of the capacitor, and Fig. 4 The figure is an equivalent circuit diagram of a capacitor, Figure 5 is an equivalent circuit diagram when single cells are connected in parallel, Figure 6 is a graph showing the relationship between the number of single cells and capacity, and Figure 7 is the number of single cells and withstand voltage. FIG. 8 is a vertical cross-sectional view showing a conventional electric double layer capacitor. 1... Single cell, 2... Insulating plate, 3, 4... Terminal board, 5... Exterior case, 6, 7... Lead terminal,
8...Outgoing electrode, 9...Outgoing lead terminal.

Claims (1)

[Scope of Claims] 1. An electric double layer capacitor in which a plurality of single cells are stacked in series and housed in an exterior case, and lead terminals that are electrically connected to electrodes at both ends of the stacked single cell group are drawn out of the exterior case. An electric double layer capacitor characterized in that a lead electrode is interposed between the single cells, and a lead terminal electrically connected to the lead electrode is drawn out to the outside of the outer case. 2. The electric double layer capacitor according to claim 1, wherein a portion of the lead terminal connected to the lead electrode located inside the outer case is coated with an insulating material.