JPH08751Y2 - Electric double layer capacitor - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an electric double layer capacitor using a solid polarizable electrode.

[Prior art]

For the electric double layer capacitor, a paste-type polarizable electrode obtained by mixing activated carbon powder and an electrolytic solution (eg, dilute sulfuric acid) is used for the polarizable electrode, and activated carbon powder is fired or sintered. And a solid polarizable electrode impregnated with an electrolytic solution is used. FIG. 3 shows a conventional electric double layer capacitor using a paste-like polarizable electrode. In FIG. 3, 1 is a collector, 3 is a separator, 4 is a gasket, 5 is an electrode plate, and 7
Is a paste-like polarizable electrode, C is a basic cell, and F is a pressure. As the current collector 1, for example, conductive rubber is used. The separator 3 has a property of allowing ions to pass but not electrons, for example, a porous plastic film is used. The gasket 4 is
The paste-like polarizable electrode 7 is used to insulate the paste-like polarizable electrode 7 from the surroundings, and for example, insulating rubber is used. The basic cell C of the electric double layer capacitor is configured by filling the concave portion formed by the current collector 1 and the gasket 4 with the paste-like polarizable electrode 7 and facing each other with the separator 3 interposed therebetween. Although only one basic cell C is shown in FIG. 3, some basic cells C may be stacked and used depending on the application. An electrode plate 5 is brought into contact with the outside of the current collector 1 of such a basic cell C, and is electrically connected to other portions via the electrode plate 5. In general, the smaller the internal resistance of the capacitor, the better. However, in the electric double layer capacitor using the paste-like polarizable electrode 7, the contact resistance between the activated carbon powders in the paste-like polarizable electrode 7, the contact resistance between the paste-like polarizable electrode 7 and the current collector 1, etc. It is a cause of increasing the internal resistance. Therefore, in order to reduce their contact resistance,
The pressure F is applied from the outside of the electrode plate 5. FIG. 4 shows a conventional electric double layer capacitor using solid polarizable electrodes. Reference numerals correspond to those in FIG. 3, and 2 is a solid polarizable electrode. In the solid polarizable electrode 2, since the activated carbon powders are solidified in close contact with each other, the contact resistance between the activated carbon powders is small. As a result, the internal resistance is considerably reduced, so that it is not necessary to apply the pressure F as in the electric double layer capacitor using the paste-like polarizable electrode 7. Since the solid polarizable electrode has a larger bulk density (grams per 1 cm ³ ) of the activated carbon powder than the pasty polarizable electrode (for example, 0.5 to 0.7 g / cm ³ ), the obtained capacitor capacity is also large. Further, since it is solid, it has advantages such as easy handling and good workability during manufacturing. In addition, as a document relating to an electric double layer capacitor using a solid polarizable electrode, there is, for example, Japanese Patent Publication No. 54-24100.

[Problems to be solved by the device]

(Problem) However, the conventional electric double layer capacitor using the above-mentioned solid polarizable electrode has a problem that the electrode plate and the basic cell are easily misaligned. (Explanation of Problems) In the electric double layer capacitor using the paste-like polarizable electrode 7 as shown in FIG. 3, pressure F is applied from the outside of the electrode plate 5 and strongly pressed against the current collector 1. Therefore, the electrode plate 5 and the basic cell C will not be displaced. However, in the electric double layer capacitor using the solid polarizable electrode 2 as shown in FIG. 4, the pressure F is not applied,
The electrode plate 5 is merely in contact with the current collector 1 so as to maintain electrical contact therewith. Therefore, when some force is applied in the lateral direction, the electrode plate 5 and the basic cell C may be displaced. If they are deviated, the current collector 1 and the electrode plate 5 come into contact with each other only over a small area, which causes a disadvantage such as a large electric resistance. Therefore, in order to prevent the displacement and improve the adhesion, the electrode plate 5 may be heat-sealed to the current collector 1. This work is desired to be completed in as short a time as possible, but in order to perform heat fusion in a short time, it is necessary to pressurize while raising the temperature. However, in this case, the gas generated from the current collector 1 (conductive butyl rubber or the like) is trapped between the electrode plate 5 and the adhesion between the two may be hindered. The present invention aims to solve such problems.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, in the electric double layer capacitor of the present invention, the electrode plate having the pores scattered is brought into contact with the outer surface of the current collector brought into contact with the solid polarizable electrode.

[Action]

In an electric double layer capacitor using a solid polarizable electrode, if an electrode plate with scattered pores is used as the electrode plate,
The edge of the pore bites slightly into the surface of the current collector, so
The electrode plate will not be displaced with respect to the basic cell. Further, when the electrode plate and the current collector are heat-sealed, the pores allow the generated gas to escape to the outside, so that the gas is not trapped between the electrode plate and the current collector.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an electric double layer capacitor according to an embodiment of the present invention, and FIG. 2 shows a plan view of an electrode plate. Reference numerals correspond to those in FIG. 4, and 6 is a pore. From a structural point of view, a point different from the conventional example of FIG. 4 is that a large number of pores 6 are scattered in the electrode plate 5. When the electrode plate 5 with the pores 6 opened is brought into contact with the current collector 1 to the extent that electrical contact is maintained, the edge portion of the pores 6 slightly digs into the surface of the current collector 1. Therefore, even if the electrode plate 5 is displaced with respect to the basic cell C, it is not displaced. Further, in order to surely prevent the displacement and improve the adhesion, when the electrode plate 5 is heat-sealed to the current collector 1, the gas generated from the current collector 1 passes through the pores 6 and is exposed to the outside. Therefore, it is not trapped between the current collector 1 and the electrode plate 5. Therefore, the generated gas does not hinder the adhesion between the current collector 1 and the electrode plate 5. Further, since the gas is released, the fusion bonding is performed almost uniformly in all parts, so that the electrode plate 5 is not easily peeled off.

[Effect of device]

As described above, according to the electric double layer capacitor of the present invention, since the electrode plate having the scattered pores is used, the following effects can be obtained. Since the edges of the pores slightly bite into the surface of the current collector, the electrode plate was less likely to shift with respect to the basic cell. When the electrode plate and the current collector are heat-sealed, the pores allow the generated gas to escape to the outside, so that the gas is not trapped between the electrode plate and the current collector.

[Brief description of drawings]

1 ... Electric double layer capacitor according to an embodiment of the present invention FIG. 2 ... Plan view of electrode plate in the present invention FIG. 3 ... Conventional electric double layer capacitor using paste-like polarizable electrode FIG. 4 ... Solid Conventional electric double layer capacitor using polarizable electrodes In the figure, 1 is a current collector, 2 is a solid polarizable electrode, 3 is a separator, 4 is a gasket, 5 is an electrode plate, 6 is a pore, and 7 is a pore.
Is a paste-like polarizable electrode, C is a basic cell, and F is a pressure.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Yoriaki Niida, No. 8 Tsutana, Fujisawa City, Kanagawa Prefecture, within Isuzu Engineering Co., Ltd. (56) References Japanese Patent Laid-Open No. Sho 63-181412 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. An electric double layer capacitor, characterized in that an electrode plate in which pores are scattered is brought into contact with the outer surface of a current collector brought into contact with a solid polarizable electrode.