JPH0517872Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to an electric double layer capacitor, and particularly to an electrode structure of an electric double layer capacitor. [Prior Art] Conventionally, this type of electric double layer capacitor generally has a structure as shown in FIG. That is, a laminate 6 of an electric double layer capacitor element (hereinafter referred to as basic cell) 5, a first electrode plate 7, an insulating case 3, and a second electrode plate 2 are housed in an exterior case 4 as shown in the figure, and the exterior is It has a structure in which the upper end of the case is caulked. As shown in FIG. 4, the basic cell 5, which is a component of the electric double layer capacitor, has powdered activated carbon in a space surrounded by a conductive separator that is electronically conductive and impermeable to ions, and a nonconductive gasket 10. A paste electrode 9 made of an electrolyte solution is filled, and a porous separator 11 having ion permeability and non-electron conductivity is disposed in the center to prevent electrical conduction between the paste electrodes 9. ing. Further, as shown in FIG. 5a, the first electrode plate 7 has two U-shaped notches 7b.
The electrode terminal 7a is used with the protruding electrode terminal 7a raised upward by 90 degrees as shown in FIG. 5b. The electric double layer capacitor is manufactured by applying a pressure of 1 to 100 Kg/cm ² to the laminate 6 of the basic cell 5 in order to reduce contact resistance between activated carbon particles in the paste electrode 9.
While this state is maintained, the upper open end of the metal exterior case 4 is caulked and sealed. [Problems to be solved by the invention] In the conventional electric double layer capacitor described above, the corner of the notch 7b of the first electrode plate 7 directly contacts the upper part of the basic cell 5. If the pressure applied to the conductive separator 6 is too high, there is a drawback that the conductive separator 8 may be torn by the corners of the notch 7b. An object of the present invention is to provide an electric double layer capacitor having a structure that eliminates such drawbacks. [Means for solving the problem] The electric double layer capacitor of the present invention has electrode terminals protruding in the shape of a dog's nose as a first electrode plate that makes direct electrical contact with the upper part of the laminate of the basic cell. , after integrally molding a disk-shaped electrode surface on the side opposite to the electrode terminal, pull the electrode terminal upward 90 degrees and bend the disk-shaped electrode surface 180 degrees downward. It is characterized by the use of a flat bottom surface. [Example] Next, the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a sectional view of an electric double layer capacitor according to an embodiment of the present invention, and FIG. 2 shows a first electrode plate used in the present invention. First, as shown in FIG.
a, a disk-shaped electrode 1b with the same diameter as the electrode plate 1 on the opposite side;
After integrally molding with a press mold to form the electrode terminal 1a on the top side as shown in Fig.
Raise it 90 degrees and place the disc-shaped electrode 1b on the bottom side.
It is constructed by folding back 180 degrees. Next, the second electrode plate 2 and the first electrode plate 1 are combined with the insulating case 3 in between to form a basic cell 5 with an outer diameter of 11 mm and a thickness of 1.4 mm.
is housed in an electrically conductive exterior case 4 made of metal such as stainless steel along with a laminate 6 made of eight layers,
A pressure of 150 kg/cm ² is applied from the top and bottom of the laminate 6, and while this state is maintained, the opening of the outer case 4 is bent inward and sealed by caulking, thereby producing the electric double layer capacitor of the present invention as shown in FIG. was gotten. We manufactured 5,000 electric double layer capacitors of this invention and those with conventional structure, and investigated the occurrence of defects due to conductive separator breakage. Table 1 shows the results. As can be seen from this table, there were zero defects in the case of the present invention, but in the case of the conventional structure.
A total of 535 cases occurred.

[Effect of idea]

As explained above, the present invention provides a disk-shaped electrode on the first electrode plate, integrally molds it, and then folds the disk-shaped electrode 180 degrees to form the basic cell of the first electrode plate. The surface in direct contact becomes flat, and stable production can be achieved even if the pressure applied to the laminate during caulking and sealing is increased.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an electric double layer capacitor according to an embodiment of the present invention, Figure 2a is a developed plan view of the first electrode plate used in the present invention, and Figure 2b is the electrode plate of Figure 2a. Figure 3 is a cross-sectional view of a conventional electric double layer capacitor, Figure 4 is a cross-sectional view of a conventional electric double layer capacitor element, and Figures 5 a and b are plane views of a conventional first electrode plate. FIG. 2 is a diagram and a completed sectional view. 1...First electrode plate according to the present invention, 1a, 7a
... Electrode terminal, 1b ... Disc-shaped electrode, 1c, 7b
... Notch part, 2 ... Second electrode plate, 3 ... Insulation case, 4 ... Exterior case, 5 ... Basic cell,
6... Laminated body, 7... Conventional first electrode plate, 8...
...Conductive separator, 9...Paste electrode, 10
... Non-conductive gasket, 11 ... Porous separator.

Claims (1)

[Scope of utility model registration request] At least one electric double layer capacitor element is housed in a metal exterior case, a first electrode plate having a first electrode terminal is electrically connected to the top of the capacitor element, and a second electrode terminal is electrically connected to the top of the capacitor element. electrically connecting a second electrode plate having a capacitor element with the lowest part of the capacitor element in a metal exterior case through the case, insulating the second electrode plate and the case from the first electrode plate, and In the electric double layer capacitor having an insulating case for positioning the first electrode terminal and the second electrode terminal, the first electrode plate is arranged such that the first electrode terminal is arranged in a manner similar to that of a dog's nose toward the outside. A disc-shaped electrode surface is continuously formed integrally on the side opposite to the first electrode terminal, and the first electrode terminal is pulled upward by about 90 degrees, and An electric double layer capacitor characterized by a shape in which the disk-shaped electrode surface is bent 180 degrees downward to make the bottom surface flat.