JPH03280516A - Manufacture of electric double layer capacitor - Google Patents

Abstract

PURPOSE:To enable the gaskets of a bonded body of a separator and gaskets to be satisfactorily bonded onto a collector by a method wherein the separator and the gaskets are previously bonded to one another in the stage wherein an electrolyte is not participated at all. CONSTITUTION:A bonded body wherein a separator 3 and gaskets 4 are bonded to one another by firstly pressurizing, heating, welding, etc., is previously formed. Next, a solid polarizing electrode 2A is arranged on the specific position of a collector 1 so as to be impregnated with an electrolyte 5 by dripping step, etc. The surface of the solid polarizing electrode 2A brings about the exuding state of the electrolyte 5 however the electrolyte 5 stagnating on the surface of the solid polarizing electrode 2A due to the surface tension thereof neither drip on nor run into the bonding surface 1-1. Successively, the bonded bodies of the separators 3 and the gaskets 4 are laminated to make the gaskets 4 and the bonding surfaces 2 bond to one another. Such a bonding step can be performed satisfactorily since the electrolyte 5 does not adhere to any bonding surface. Finally, two solid polarizing electrodes 2A are opposed to each other upside down on the other half body of the electric double layer capacitor through the intermediary of the separators 3 so that the similar bonding step may be repeated.

Description

[Detailed description of the invention] [Industrial application field]

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

[Conventional technology]

Most electric double layer capacitors use polarizable electrodes as
It used a paste-like polarizable electrode made by mixing activated carbon powder and an electrolyte (e.g., dilute sulfuric acid).The second panel is a diagram showing the manufacturing method of such a conventional electric double layer capacitor. In Fig. 2, 1 is a current collector;
2 is a paste-like polarizable electrode, 3 is a separator, 4 is a gasket, and 4-1 is an adhesive surface. FIG. 2(b) shows a configuration in which a gasket 4 is adhered to the end of the current collector 1, and a paste-like polarizable electrode 2 is packed in a recess surrounded by the gasket 4. This constitutes half of the electric double layer capacitor. As the current collector 1, for example, conductive rubber is used, and as the gasket 4, for example, insulating rubber is used. The separator 3 shown in FIG. 2 (A) is stacked on the top surface of FIG. . The separator 3 is a porous film (eg, a plastic film) that allows ions to pass through but blocks electron conduction. On top of FIG. 2(C), a separately manufactured half body similar to that in FIG. 2(B) is stacked upside down and adhered at the gaskets 4 at both ends. In this way, an electric double layer capacitor as shown in FIG. 2(d) is obtained. For example, Japanese Patent Publication No. Sho 63-13332 is a document related to a method for manufacturing such an electric double layer capacitor.

[vlI that invention tries to solve! Pi] (Problem) In the conventional electric double layer capacitor manufacturing method described above,
When a solid polarizable electrode is used as the polarizable electrode, there is a problem in that adhesion at the gasket portion is not good. (Description of the problem) In order to further increase the capacity of electric double layer capacitors, there are some that use solid polarizable electrodes that have a larger surface area per unit weight than paste-like polarizable electrodes. A solid polarizable electrode is made by sintering or firing activated carbon powder to make it solid and impregnating it with an electrolyte (eg, dilute sulfuric acid). However, when an electric double layer capacitor using solid polarizable electrodes is manufactured by the conventional manufacturing method as described above, adhesion at the gasket portion is not good as described below. FIG. 3 is a diagram illustrating problems when manufacturing an electric double layer capacitor using solid polarizable electrodes by a conventional manufacturing method. The numbers correspond to those in FIG. 2, and 2A is a solid polarizable electrode. This figure shows the stage corresponding to figure 2 (b), that is,
The figure shows a state in which a separator 3 is being bonded to a half of an electric double layer capacitor. Impregnation of the electrolyte into the electrode 2A with solid polarity is carried out by sintering or firing activated carbon powder to solidify it, and then infiltrating it by dropping the electrolyte.However, this electrolyte is not a paste. Unlike in the case of polarizable electrodes 2, a relatively large amount of electrolyte tends to remain seeped onto the surface. The electrolyte 5 shown by the dotted line in FIG. 3 is a somewhat exaggerated representation of the seeping electrolyte. When the separator 3 is placed on top of this, the electrolytic solution 5 seeping out onto the surface of the solid polarizable electrode 2A will be transmitted through the separator 3 and will also adhere to the adhesive surface 4-1 of the gasket 4. The adhesive surface 4-1 is a part that is not only bonded to the separator 3 but also bonded to the gasket 4 of the other half of the electric double layer capacitor stacked above. Since it is in an adhered state, the adhesion is not good, and as a result, the electrolyte may leak to the outside of the electric double layer capacitor. An object of the present invention is to solve the above-mentioned problems. [Means for Solving the Problems] In order to solve the above problems, the method for manufacturing an electric double layer capacitor of the present invention includes a first step of forming an adhesive between a separator and a gasket, and a step of forming an adhesive at a predetermined position of a current collector. a second step of forming a first half impregnated with an electrolytic solution by placing a solid polarizable electrode on the electrode; and overlaying the adhesive on the first half to bond the gasket and the first assembly. a third step of bonding the electric body; and a second step of bonding a second half having the same structure as the first half so that the solid polarizable electrodes face each other with a separator in between, and bonding the gasket parts. The process consisted of 4 steps.

[For production]

Since the separator and the gasket were bonded in advance at a stage where no electrolyte was involved, this bonding was performed well. In addition, when bonding a gasket and a current collector, the adhesive surface on the current collector side is separated from the surface of the solid polarizable electrode from which the electrolyte oozes by the thickness of the solid polarizable electrode. The situation is as follows. Therefore, when the gasket of the separator and gasket bonded body is bonded to the bonding surface of the current collector, the electrolytic solution does not reach the bonding surface. Therefore, it becomes possible to perform adhesion well.

【Example】

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a method for manufacturing an electric double layer capacitor according to an embodiment of the present invention. The symbols correspond to those in Figure 3 of the second edition. 1-1 is the adhesive surface of the current collector 1. First of all, as shown in FIG. 1(a), a bonded body is made in advance by bonding the separator 3 and the gasket 4 by pressurization, heat welding, etc. During this bonding, the electrolyte 5 is not applied to the bonded surface. Since there is no involvement, adhesion takes place well. The gasket 4 may be made of vulcanized rubber or unvulcanized rubber. Next, as shown in FIG. 1(B), a solid polarizable electrode 2A is placed (or may be heated and welded) at a predetermined position on the current collector 1, and the electrolytic solution 5 is impregnated with the dropping ring. The surface of the solid polarizable electrode 2A is in a state where the electrolytic solution 5 oozes out as described above. However, due to the surface tension of the electrolyte 5, the solid polarizable electrode 2
It remains on the surface of A and does not fall and flow toward the adhesive surface 11. Therefore, the electrolytic solution 5 does not adhere to the adhesive surface 1-1 of the current collector 1 that is scheduled to be adhered to the gasket 4. Layer the adhesive body of the separator 3 and gasket 4 in Figure 1 (A) on the one in Figure 1 (B), and stack the gasket 4 and the adhesive surface 1.
-1. This adhesion is performed well because the electrolyte 5 is not attached to any of the adhesion surfaces. Finally, place the solid polarizable electrodes 2A on top of the other half of the electric double layer capacitor corresponding to FIG.
Layer (c) upside down, that is, layer (c) upside down on top of Figure 1 (b) and adhere in the same way. Even in this case of adhesion, since the electrolytic solution 5 is not attached to the adhesion surface, the adhesion is performed well. In the manner described above, an electric multilayer capacitor using the solid polarizable electrode 2A as the polarizable electrode as shown in FIG. 1(d) is completed.

【Effect of the invention】

As described above, according to the method for manufacturing an electric double layer capacitor of the present invention, the adhesion work required for manufacturing an electric double layer capacitor can be performed by removing the electrolytic solution exuding onto the surface of the solid polarizable electrode. Since it can be done without any adhesion, the adhesion can now be done well. Therefore, leakage of electrolyte from the electric double layer capacitor will not occur.

[Brief explanation of drawings]

Figure 1: Manufacturing method of an electric double layer capacitor according to an embodiment of the present invention Figure 2: Conventional method of manufacturing an electric double layer capacitor Figure 3: Electric double layer capacitor using solid polarizable electrodes In the diagram explaining the problems when manufacturing multilayer capacitors using conventional manufacturing methods, 1 is a current collector, 1-1 is an adhesive surface, 2 is a paste polarizable electrode, 2A is a solid polarizable electrode, 3 4 is a separator, 4 is a gasket, 4-1 is an adhesive surface, and 5 is an electrolyte.

Claims (1)

[Claims] a first step of forming an adhesive between the separator and the gasket; a second step of placing a solid polarizable electrode at a predetermined position on the current collector to form a first half impregnated with an electrolytic solution; a third step of stacking an adhesive body on the first half and bonding the gasket and the first current collector;
and a fourth step of stacking a second half having the same configuration as the half and the second half so that the solid polarizable electrodes face each other with a separator in between, and bonding the gasket part. Production method.