JPH0735381Y2 - Electric double layer capacitor - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an electric double layer capacitor in which an outer case can be made of a material having low rigidity.

[Prior art]

FIG. 3 shows a conventional electric double layer capacitor. In FIG. 3, 1 is an outer case, 2 is an insulating plate, 3 is a caulked portion of the outer case 1, 4 is an electrode plate, 4-1 is a terminal port, 5 is a terminal integrated with the electrode plate 4, and 6 Is an electrode plate, 7 is a terminal integrated with the electrode plate 6, and 8 is a cell of an electric double layer capacitor. In FIG. 3, four cells 8 are stacked, but the number of stacked cells can be set to an appropriate number depending on the application. The electrode plate 6 is brought into contact with the upper surface of the laminated products, and the bottom portion of the outer case 1 is brought into contact with the lower surface thereof. The electrode plate 6 is covered with the insulating plate 2, and the other electrode plate 4 is placed thereon. The electrode plate 4 contacts the caulking portion 3 of the outer case 1 and is pressed downward by the caulking portion 3. The terminal 7 integrated with the electrode plate 6 is drawn out to the outside through the terminal port 4-1. The insulating plate 2
Is for insulating the electrode plate 6 and the electrode plate 4 from each other. As is well known, the cell 8 of the electric double layer capacitor has a built-in polarizable electrode formed by mixing activated carbon powder with an electrolyte solution (for example, dilute sulfuric acid) to form a paste, in order to reduce the contact resistance generated by this. Then, the pressure is applied in the direction of the electrode plate. In the electric double layer capacitor having the structure shown in FIG. 3, the pressing force is generated by crimping the edge of the outer case 1. That is, the four cells 8 are pressed by the pressing force applied by the caulking portion 3 via the electrode plate 4. As a conventional document relating to the outer case of the electric double layer capacitor, there is, for example, Japanese Utility Model Laid-Open No. 61-138236.

[Problems to be solved by the device]

(Problem) The above-mentioned conventional electric double layer capacitor has a problem that a material having high rigidity is required as a material for the outer case. (Explanation of Problems) When four cells of the electric double layer capacitor are stacked as shown in FIG. 3, if the caulking portion 3 does not generate the force necessary to pressurize these four cells. I won't. Therefore, the material of the outer case 1 must have rigidity sufficient to generate the force. On the other hand, FIG. 4 shows a conventional electric double layer capacitor in which the number of laminated cells is half (two) in FIG. 3, but in this case, since the number of laminated cells is half, the caulking part 3 generates The force exerted may be smaller than in the case of FIG. Therefore, the rigidity of the outer case 1 may be smaller than that in the case of FIG. 3, and if the same material is used, the plate thickness can be made thin. As is clear from the above, as the number of laminated cells increases, the rigidity of the outer case 1 must be increased, resulting in an increase in weight and cost. The present invention aims to solve the above problems.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, in the electric double layer capacitor of the present invention, even if the number of cells to be pressurized increases, the following measures are taken so that an outer case having a rigidity smaller than that of the conventional case is sufficient. That is, in the electric double layer capacitor of the present invention, a cylindrical metal outer case with both ends separated, and a metal partition integrally provided with the outer case in the center of the outer case so as to divide the both end directions into two parts. A cell having a plate number, and the number of layers of the partition plate is approximately divided into two parts in a direction toward both ends of the outer case, and the cell is provided between the pressurizing means using a part of the outer case and the partition plate. It was decided to pressurize.

[Action]

The cells are laminated by dividing the number of layers into two by separating the partition plates.
Each of the stacked layers is pressed between a partition plate and a pressing unit that uses a part of the outer case. Therefore, the pressurizing force that the pressurizing means must generate is sufficient to pressurize approximately half the number of cells. Since the pressurizing means uses a part of the outer case, the applied pressure depends on the rigidity of the outer case. Will also be small.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (First Embodiment) FIG. 1 shows an electric double layer capacitor according to a first embodiment of the present invention. The reference numerals correspond to those in FIG. And 9 is a partition plate. According to the present invention, the structure of the outer case 1 is divided into two parts by a partition plate 9 in a substantially central part of a cylindrical metal whose both ends are separated.
Is provided integrally. Exterior case 1 of partition plate 9
It can be attached to, for example, spot welding. Then, with the partition plate 9 as a boundary, the cell 8 is laminated by dividing the number of layers to be laminated so as to be as vertically symmetrical as possible. In the structure shown in FIG. 1, two cells 8 are stacked above the partition plate 9 and two cells 8 are also stacked below the partition plate 9. The electrode plate 6, the insulating plate 2 and the electrode plate 4 are placed on top of the stacked layers, and finally the edge portion of the outer case 1 is caulked to press the electrode plate 4. The caulking portion 3 corresponds to “a pressurizing unit that uses a part of the outer case”. With such a structure, the cells 8 stacked above the partition plate 9 are pressed below the partition plate 9 between the partition plate 9 and the caulking portion 3 at the upper end of the outer case 1. The cell 8 is pressed between the partition plate 9 and the caulking portion 3 at the lower end of the outer case 1. That is, the caulking portion 3 at the upper end or the lower end may generate a force that presses the cells 8 stacked above or below the partition plate 9, respectively. Therefore, assuming that two cells 8 are stacked as shown in FIG. 1, the rigidity required for the outer case 1 is such that two cells 8 are stacked independently as shown in FIG. The rigidity may be the same as that of the case. When the four cells 8 are stacked without providing the partition plate 9 (in the case of FIG. 3), the caulking of the outer case 1 presses the four cells to reduce the contact resistance as desired.
A larger pressing force is required than in the case of stacking the individual pieces (in the case of FIG. 4), and therefore the rigidity of the outer case 1 needs to be increased. However, when the partition plate 9 is provided so that the four parts can be divided into two parts and pressed, the caulking part 3 can be divided into two parts.
It only needs to generate a force to press the individual cells (however, the number of caulking parts is doubled). Therefore, the rigidity of the outer case 1 is smaller than the rigidity required when the same number (4) of cells are stacked in the conventional electric double layer capacitor. Therefore, the cost is reduced. FIG. 2 is an electrical equivalent circuit diagram of the electric double layer capacitor of FIG. The terminals 7 at the top and bottom of FIG. 1 are terminals of the same polarity, and if they are of positive polarity, the terminals (not shown) connected to the partition plate 9 and the outer case 1 will be terminals of negative polarity. (Second Embodiment) FIG. 5 shows an electric double layer capacitor according to a second embodiment of the present invention. The reference numerals correspond to those in FIG. The reference numeral 10 designates a claw for cutting and raising a part of the wall of the outer case 1, and an enlarged view thereof is shown in FIG. The difference from the first embodiment is that the "pressurizing means utilizing a part of the outer case" for pressing the electrode plate 4 is cut and raised from the outer case 1 instead of the caulking portion 3 of the outer case 1. It is the point that it was cut and raised claw 10. FIG. 7 is a diagram for explaining a situation in which the electrode plate 4 is pressed by the cut-and-raised claws 10 of the outer case 1. FIG. 7 (a) is a view of the outer case 1 as seen from above, in which the cut-and-raised claws 10 are cut and raised toward the inside and below. FIG. 7 (B) is a plan view of the electrode plate 4, which has a terminal port 4-1 for allowing the terminal 7 to pass therethrough and a cut-and-raised claw 10 for passing through the peripheral portion. A cutout portion 4-2 is provided. After stacking the cells in the outer case 1 and mounting the electrode plate 6 and the insulating plate 2, the electrode plate 4 is positioned so that the cutout portion 4-2 cuts and rises and passes through the claw 10. Push down. Thereby, the stacked cells are pressurized. When the cutout portion 4-2 has passed the cut-and-raised claw 10, the electrode plate 4 is rotated to shift the positions of the cut-and-raised claw 10 and the cutout portion 4-2. The state is shown in FIG. 7 (C). In this state, since the electrode plate 4 is cut and raised and is locked by the claw 10, it does not move backward. Therefore, the pressure applied to the stacked cells is maintained.

[Effect of device]

As described above, according to the present invention, even if the same number of cells are laminated as a whole, the material of the outer case is less rigid than the conventional one, so that the weight of the outer case can be reduced. The cost will be cheaper as well.

[Brief description of drawings]

FIG. 1 ... Electric double layer capacitor according to the first embodiment of the present invention FIG. 2 ... Electrical equivalent circuit diagram FIG. 3 Conventional electric double layer capacitor FIG. 4 Laminated cell number is half of FIG. Conventional electric double layer capacitor of Fig. 5 ... Electric double layer capacitor according to the second embodiment of the present invention Fig. 6 ... Enlarged view of cut and raised claws Fig. 7 ... Electrode plate with cut and raised claws of outer case In the drawings, 1 is an outer case, 2 is an insulating plate, 3 is a crimped portion, 4 is an electrode plate, 4-1 is a terminal port, 4-2 is a notched portion, 5
Is a terminal, 6 is an electrode plate, 7 is a terminal, 8 is a cell, 9 is a partition plate, and 10 is a raised claw.

Claims (1)

[Scope of utility model registration request] 1. A tubular metal outer case with both ends separated, and a metal partition plate integrally provided with the outer case in a central portion of the outer case so as to divide the both end directions into two parts. The cells stacked by dividing the number of layers from the partition plate toward both ends of the outer case by about 2 are pressed between the pressure plate and the partition plate using a part of the outer case. Electric double layer capacitor characterized by.