JPS58140110A - Electric double layer condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric double layer capacitor, and more particularly to a structure of a nine electric double layer capacitor that uses paste electrodes to maintain the internal resistance of the electric double layer capacitor at an extremely low value.

A double layer capacitor using paste electrodes has a cross-sectional structure as shown in Figure 1, as shown in U.S. Patent No. 3,536,963. 2 is a paste electrode made of activated carbon powder and an electrolyte solution; 3 is an ion-permeable porous separator that prevents electron conduction to prevent conduction between the electrodes; 4 is a paste This is a non-conductive gas foot that holds the electrode and isolates it from the outside world. In this structure, in order to reduce internal resistance, each component material should be as thin as possible, and the thickness of the paste electrode should also be as thin as possible. will be included. On the other hand, in order to reduce the resistance itself of the constituent materials by the above-mentioned means and to minimize the contact resistance between the activated carbon particles in the paste electrode 2, it is recommended to
It is desirable to operate with a pressure of 0 kg/m2 applied to the electric double layer capacitor and maintained therein. Conventionally, this type of electric double layer capacitor can be obtained by stacking the required number of electric double layer capacitors (hereinafter referred to as basic cells) as shown in Figure 1 (1m) to meet the t-required operating voltage. A multi-layer double layer capacitor as shown in Figure 2, or a multi-stage double layer capacitor designed and manufactured in a multi-layered structure to obtain a desired withstand voltage in advance as shown in Figure 3, is housed in a case together with electrode leads, etc. However, rather than applying a predetermined pressure to the double layer capacitor and then caulking or screwing the double layer capacitor while keeping it at t, the predetermined pressure is maintained by the strength of the caulking or screwing portion, thereby easily achieving the above-mentioned purpose.

Such a conventional electric double layer capacitor is shown in Fig. 4(b).
As shown in the figure, nine basic cells 6 are stacked according to the desired withstand voltage.
An upper plate 8 made of the same material as the metal storage canopy with the interior treated with resin lining, a metal lower plate 9,
Insulating rubber 10. Lead plate for electrode extraction 11. It is composed of a bottling resin 12 and a caulking part 13 of a metal storage cuff.

However, in this configuration, the material cost is high because upper and lower metal plates and storage cans are used to apply and maintain a predetermined pressure to the basic cell.

However, there are drawbacks that prevent significant cost reductions.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such conventional drawbacks and provide an electric double layer capacitor.

According to the present invention, a laminate of a plurality of electric double layer capacitor cells1. A pinching pressure is applied between a pair of electrode plates attached with the IJ-shaped part protruding, and the first resin layer is formed on the central side of the cell, and the outer circumferential side of the first resin layer and the pair of l An electric double layer capacitor characterized in that the upper and lower surfaces of the electrode plates are covered with a second resin layer is obtained.

Examples of the present invention will be described in detail below.

〔Example〕

The basic cell is a narrow product of approximately xzoo//g (BET method).

Activated carbon with a particle size of 300 mesh or less and 30 weight sulfuric acid were mixed and stirred, and a 9-paste electrode was laminated with 0.2 MO conductive butyl rubber on the bottom. The butyl rubber gasket was filled with the pair of paste electrodes, and then the butyl rubber gasket was pressed through a polypropylene porous membrane to produce a layered structure as shown in FIG.

Eight nine basic cells obtained in this way were stacked as shown in Figure 2 and sandwiched between copper current collectors for lead extraction with a diameter of 301 m, and the series resistance was ([8B) is measured at frequency 1-, and from this,
Its characteristics were as shown in FIG.

Next, as shown in FIG. 6, the aforementioned basic cell 16'f:8
After laminating electrode plates 22 (hereinafter referred to as electrode retrieval lead plates) with protruding lead parts attached to the upper and lower layers in the measurement array, using a pressurizing means such as a known clamp jig, etc. This state was maintained by applying constant pressure from above and below. Next, epoxy resin for casting is injected in a ring shape along the circumference between the lead plates 220 for taking out the electrodes 9 of the upper and lower layers using a syringe or the like, and is coated on the circumferential surface of the basic cell 16. After that, it is dried and hardened. Ta. With this, the lead plate 2 for taking out the electrodes of the upper and lower layers
2 were firmly fixed and a constant pressure was applied to the basic cell 16 to maintain the 9 state.

Next, after releasing the pressure from the aforementioned pressure means, the entire laminate of the basic cell 16 is immersed in the epoxy resin for casting, leaving only the protruding lead portion 22m of the lead plate 22 for taking out the electrode. By forming the exterior insulator 14, the electric double layer capacitor of the present invention is obtained. The initial characteristics of this electric double layer capacitor at room temperature were as shown in Table 1 (a). In addition, when this was left at room temperature and at 70°C for i, ooo hours, its characteristics were measured at room temperature, and the average characteristics were as shown in Table 1. By covering the multilayer capacitor with resin, it is possible to easily and inexpensively supply an electric double layer capacitor that is stable for a long time.

11 The electric double layer correductor of the present invention, which can easily match the required characteristics by arbitrarily designing the basic cell structure, has a large capacity suitable for applications such as holding power during power outages and absorbing ripples. It has great industrial value as a capacitor.

[Brief explanation of drawings]

Figure 1 is a sectional view of a basic cell of an electric double layer capacitor using paste electrodes, Figure 2 is a sectional view of a basic cell stacked together, and Figure 3 is a sectional view of a double layer capacitor with a multi-layered structure. 4(a) and 4(b) are structural diagrams of a double layer capacitor showing a first example of the conventional example. Fig. 5 is a characteristic diagram showing the relationship between the internal resistance of a basic cell and the pressure applied to the cell, and Fig. 6 (1) and (b) are cross-sectional and plan views of a double layer capacitor showing an embodiment of the present invention. . 1...°°° conductive separator, 2... activated carbon-electrolyte paste electrode, 3... porous separator 4.4... non-conductive gasket, 5・・・・・・
...Internal conductive separator J, L 16...Double layer capacitor cell, 7...Metal storage can,
8...Metal upper plate, 9...Metal lower plate, 10...Insulating rubber, 11, 22...
Number of electrodes) lead plate for extraction, 12...Botti/
casting agent for molding, 13...7 caulking part, 14...
...Exterior insulator, n...Number of laminated layers. Figure 13 (a) (b) θ 2θ 4θ /θ lθ
i 77 (?> A m') 1st kidnapping

Claims (1)

[Claims] A laminate of a plurality of electric double layer capacitor cells is sandwiched between a pair of electrode plates protruding from one part of the t-saw, and pressure is applied between the first resin layer provided on the circumferential side of the cell and the first resin layer formed on the circumferential side of the cell. Joy 1
An electric double layer capacitor characterized in that the outer peripheral side surface of the resin layer and the upper and lower surfaces of the pair of electrode plates are covered with a second resin layer.