JPH0726838Y2 - Electric double layer capacitor - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an electric double layer capacitor having an improved outer case that houses stacked basic cells.

2. Description of the Related Art FIG. 2 shows a conventional electric double layer capacitor. In FIG. 2, 11 is an outer case, 12 is an insulating plate, 13 is a caulked portion of the outer case 1, 14 is an electrode plate, 14-1 is a terminal port, 15 is a terminal integrated with the electrode plate 14, 16 Is an electrode plate, 17 is a terminal integrated with the electrode plate 16, 18 is an insulating sleeve, and C is a basic cell of an electric double layer capacitor. Although four basic cells C are stacked in FIG. 2, the number of stacked basic cells C can be set to an appropriate number depending on the application. An electrode plate 16 is brought into contact with the upper surface of the stacked products, and a bottom portion of the outer case 11 is brought into contact with the lower surface. The insulating plate 12 is covered on the electrode plate 16, and the other electrode plate 14 is placed thereon. The electrode plate 14 contacts the caulking portion 13 of the outer case 11 and is pressed downward by the caulking portion 13. The terminal 17, which is integrated with the electrode plate 16, is pulled out to the outside through the terminal port 14-1. Insulation plate 12
Is for insulating the electrode plate 16 and the electrode plate 14 from each other. As is well known, the basic cell C of the electric double layer capacitor incorporates a polarizable electrode which is formed by mixing activated carbon powder with an electrolyte solution (eg, dilute sulfuric acid) to form a paste, which reduces the contact resistance generated by the electrode. Therefore, pressure is applied in the direction of the electrode plate. In the electric double layer capacitor having the structure shown in FIG. 2, the pressing force is generated by caulking the edge of the outer case 11. That is, the four basic cells C are pressed by the pressing force applied by the caulking portion 13 via the electrode plate 14. Note that, as conventional documents relating to the outer case of the electric double layer capacitor, there are, for example, Japanese Patent Laid-Open No. 56-2621 and Japanese Utility Model Laid-Open No. 61-138236.

[Problems to be solved by the device]

(Problem) The conventional electric double layer capacitor described above has the following problems. The first problem is that the outer case must be made of metal, which increases the weight and the cost. The second problem is that when connecting the electric double layer capacitors in series or in parallel, a fixing tool for fixing the mutual positional relationship is additionally required and the connecting cable becomes long. (Explanation of Problems) (1) In the conventional example shown in FIG. 2, the outer case 11 can electrically connect the lowermost basic cell C to the uppermost electrode plate 14, and is caulked. It must generate a pressure force. Therefore, as the outer case 11, a metal having good conductivity is used. The size and weight of the case are 45 mm in diameter and 1 in thickness.
If it has a small capacity of about 8 mm (1.5 F or less), it may not be a problem. But,
If you try to make a large capacity of 100 to 150F, the size of the case will increase to 200mm in height, 150mm in width, and 100mm in thickness, which cannot be ignored. (2) When several electric double layer capacitors shown in FIG. 2 are connected in series or in parallel, if each electric double layer capacitor operates independently, the wiring may be cut or electrodes with different polarities may come into contact with each other. There is a risk of Therefore, a separate fixture for fixing the mutual positional relationship is required. Further, the terminals 15 and 17 have to be provided at least closer to the center than the crimped portion 13. When fixing as described above and making a desired connection, the length of the connecting cable was long. Along with that, electrical loss also increases. The present invention aims to solve the above problems.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the electric double layer capacitor of the present invention has an opening at the top, a notch extending from the inner bottom surface to the upper edge at the side wall, and a bottom having a stepped bottom portion sized to fit into the opening. An outer case made of resin, an electrode terminal plate that is housed in the outer case so that the terminals of the stacked basic cells are sandwiched between the upper and lower sides of the basic cell, and the terminals of the basic cells are stacked. An upper pressing plate mounted on the case, a bottom plate having a positioning protrusion and mounting the outer case, and means for pinching the space between the upper pressing plate and the bottom plate are provided.

[Action]

With the above structure, since the outer case is made of resin, it is possible to reduce the weight and cost of a large electric double layer capacitor as compared with the case of using a metal. . Further, since the series connection or the parallel connection of the basic cells may be made between the terminals that are exposed to the outside in the vicinity of the side wall, the connection becomes easy and the connection cable can be short. Further, the outer case has a shape that allows stacking without displacement, and the displacement of the outer case is prevented by utilizing the pressing force of the basic cell. Therefore, the structure is strong against vibration, and it can be used even in an environment with severe vibration such as an engine room of an automobile.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a perspective view of the electric double layer capacitor of the present invention, FIG. 3 shows a top view, and FIG. 4 shows a front view. In these drawings, 1 is an outer case, 1-1 is a notch, 2 is an upper pressing plate, 2-4 is a ridge of the upper pressing plate, 3 is a bottom plate, 3
Reference numeral -2 is a positioning protrusion, 4 is a bolt shaft, 5 is a nut, 6 is an electrode terminal plate, 6-1 is a terminal of the electrode terminal plate, 7 is an insulating plate, and C is a basic cell. Inside each outer case 1, a laminated body in which the electrode terminal plates 6 are applied to the upper and lower surfaces of the laminated basic cells C is housed. In the present invention, the electrode terminal plate 6 is used to electrically connect the stacked basic cells C, and the outer case 1 is not used. Then, the electrode terminal plate 6 which is a portion to be connected
The terminals 6-1 are exposed from the cutout portion 1-1 of the outer case 1 in a closely aligned manner. A plurality of such outer cases 1 are fitted with the top and the bottom fitted together (three in FIG. 1), and sandwiched between the bottom plate 3 and the upper pressing plate 2 to apply pressure. The pressing force pressurizes the basic cells C to reduce the internal resistance and, at the same time, acts to prevent lateral displacement of the stacked outer casings 1. In this example, the bolt shaft 4 and the nut 5 are used as means for generating a pressing force. That is, the outer case 1 is not used as a means for generating a pressing force. FIG. 5 shows the electrode terminal plate 6. The electrode terminal plate 6 has the same shape as the surface of the basic cell C because it is necessary to make contact with the surface of the basic cell C for electrical connection. Terminal 6
-1 is projected from the side part of the electrode terminal plate 6, and serial connection and parallel connection are performed using this part. FIG. 6 shows an outer case used in the present invention. FIG. 6 (a) is a perspective view, FIG. 6 (b) is a plan view, and FIG. 6 (c).
Is a front view, 1-1 is a notch, 1-2 is a stepped bottom,
1-3 are openings. In the present invention, as described above, since the outer case 1 is not used as a means for electrical connection or as a pressing force generating means, the outer case 1 can be made of an insulating resin. Therefore, while being lighter than a metal case,
The cost will be lower. The notch portion 1-1 is for allowing only the terminal 6-1 to come out of the outer case 1 when the electrode terminal plate 6 is housed in the outer case 1. The notch 1-1 shown in the drawing is a notch that is long in the vertical direction, but if it is made longer in this way, the terminal 6-1 can be projected from any position. That is, it is possible to arbitrarily change the number of stacked basic cells C. The stepped bottom portion 1-2 is a bottom portion that projects downward in a stepped manner, and the size thereof is set to a size that fits into the opening portion 1-3. The bottom has such a shape that when the outer casings 1 are stacked, they are fitted into the lower outer casing 1,
This is because pressing force is applied to the stacked body of the basic cells C and the electrode terminal plates 6 housed therein, and the stacked outer case 1 does not shift. First, one electrode terminal plate 6 is put in the outer case 1, but at that time, the terminal 6-1 of the electrode terminal plate 6 is notched 1-.
Insert from 1 to the outside. Next, the basic cells C are stacked, and another electrode terminal plate 6 is placed thereon. FIG. 7 shows the upper pressing plate 2 used in the present invention. 7th
Figure (a) is a side view and Figure 7 (b) is a plan view.
1 is a flat plate part, 2-2 is a wing part, 2-3 is a bolt hole, 2-4
Is the ridge. The upper pressing plate 2 is a stacked uppermost outer case 1
Used as a lid. The flat plate portion 2-1 is the outer case 1.
It is fitted into the opening 1-3 of the. And the outer case 1
The surface of the laminated body such as the basic cell C housed inside is contacted with and a pressing force is applied. Since a pressing force is applied, it is necessary to make a material having rigidity, and such a material is, for example, metal. In the case of metal, since it is necessary to insulate the uppermost electrode terminal plate 6 of the laminated body, an insulating plate (see reference numeral 7 in FIG. 4) is inserted. When using an insulating material other than metal, it is not necessary to insert an insulating plate. The wing portion 2-2 is for being locked by the bolt shaft 4 inserted into the bolt hole 2-3 and being locked to the upper edge of the outer case 1 when the upper pressing plate 2 is lowered. . The ridge portion 2-4 is for increasing the rigidity of the flat plate portion 2-1. FIG. 8 shows a bottom plate 3 used in the present invention. FIG. 8 (a) is a side view and FIG. 8 (b) is a plan view.
Is a bolt hole, 3-2 is a positioning protrusion, and 3-3 is a ridge portion. The stacked outer casings 1 are placed on the bottom plate 3, and the positioning protrusions 3-2 are for positioning them. This allows for locations with a lot of vibration (for example,
Even when the vehicle is installed in an engine room or a place close to it, the outer case 1 can be prevented from being displaced. The ridge portion 3-3 is also provided to increase the rigidity, like the ridge portion 2-4.

[Effect of device]

According to the present invention as described above, the following effects can be obtained. Since the terminals 6-1 of the electrode terminal plate 6 are arranged close to each other and aligned and projected, the connection is easy and the connection cable can be short when connecting in series or in parallel. Since the outer case 1 can be made of resin, the weight can be reduced and the cost can be reduced even if the electric double layer capacitor is upsized. The pressure applied to the stacked basic cells C is applied to the outer case 1
Since it is also used to prevent misalignment, no separate fixture is required to prevent misalignment. Further, since it is excellent in vibration resistance, it can be used even in an environment with severe vibration (eg, engine room of automobile).

[Brief description of drawings]

FIG. 1 ... Perspective view of electric double layer capacitor of the present invention FIG. 2 ... Conventional electric double layer capacitor FIG. 3 ... Top view of electric double layer capacitor of the present invention FIG. 4 ... Electric double layer capacitor of the present invention Front view FIG. 5 ... Electrode terminal plate used in the present invention FIG. 6 Outer case used in the present invention FIG. 7 Upper press plate used in the present invention FIG. 8 Bottom plate used in the present invention 1 is an exterior case, 1-1 is a notch, 1-2
Is a stepped bottom portion, 1-3 is an opening portion, 2 is an upper pressing plate, 2-1
Is a flat plate portion, 2-2 is a wing portion, 2-3 is a bolt hole, 2-3 is a ridge portion, 3 is a bottom plate, 3-1 is a bolt hole, 3-2 is a positioning protrusion, 3-3 is a ridge portion. Parts, 4 is a bolt shaft, 5 is a nut, 6 is an electrode terminal plate, 6-1 is a terminal, 7 is an insulating plate, 11
Is an outer case, 12 is an insulating plate, 13 is a caulked portion, 14 is an electrode plate, 14-1 is a terminal port, 15 is a terminal, 16 is an electrode plate, 17 is a terminal, and C is a basic cell.

Claims (1)

[Scope of utility model registration request] 1. An outer case made of resin, which has an opening in an upper portion, a notch extending from an inner bottom surface to an upper edge in a side wall, and a bottom portion which is a stepped bottom portion sized to fit into the opening portion, and a laminate. An electrode terminal plate which is housed in the outer case so as to sandwich the upper and lower sides of the basic cell and the terminals of which are outside the cutout portion;
An upper pressing plate placed on the uppermost stacked outer case, a bottom plate having a positioning protrusion and mounting the outer case, and a means for pinching the space between the upper pressing plate and the bottom plate. An electric double layer capacitor characterized by being equipped.