JPH0717143Y2 - Electric double layer capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electric double layer capacitor, and more particularly to an assembly structure of an electric double layer capacitor element.

[Conventional technology]

As disclosed in U.S. Pat. No. 3,536,963, one of the means for obtaining a large-capacity capacitor by utilizing the electric double layer phenomenon is to bring an electric double layer into contact with carbon powder and an electrolytic solution. There is one that uses.

FIG. 3 is a sectional view of a conventional electric double layer capacitor element (hereinafter referred to as an element).

In FIG. 3, 6 is an electrically conductive and ion-impermeable conductive separator, 8 is a paste electrode composed of powdered activated carbon and an electrolyte solution, and 9 is an ion provided to prevent conduction between the paste electrodes 8 and 8. A porous separator 7 which is permeable and has non-electron conductivity is a non-conductive gasket provided to hold the paste electrode 8 and to shield it from the outside.

This element is composed of two sheets in which a paste electrode is filled by a doctor knife method or the like in a recess formed by bonding a non-conductive gasket punched in a ring shape and a conductive separator,
It is obtained by laminating with a porous separator and vulcanizing.

FIG. 4 is a sectional view of a laminated body of elements (hereinafter referred to as a laminated body). In FIG. 4, reference numeral 10 denotes the element shown in FIG. 3, which is laminated in a required number according to the required voltage.

FIG. 5 is a sectional view of a conventional electric double layer capacitor.
Here, 2 is a laminated body in which elements 10 are laminated, 5 is a conductive metal case, 4 is a first case having lead terminals on the upper and lower surfaces of an insulating case 3c for preventing a short circuit between the inner surface of the metal case 5 and the laminated body 2. It is an assembled electrode in which the electrode plate 3a and the second electrode plate 3b are arranged. The electric double layer capacitor has a stacking body 1 with a thickness of 1 to 100 kg / in order to reduce the contact resistance in the paste electrode 8.
Metal case 5 with pressure of cm ² applied and held
The open end of is bent inward to caulk and seal.

[Problems to be solved by the device]

In the conventional electric double layer capacitor described above, the upper and lower elements of the laminated body 2 are pressure-bonded to the inner surface of the metal case 5 or the second electrode plate 3b, so that the pressure applied to the laminated body 2 at the time of caulking and sealing is 100 kg. If it is set to / cm ² or more, the upper and lower elements of the laminated body will be separated from the metal case 5 or the second electrode plate 3b when the elements try to spread laterally against the pressure as shown in FIG. 2 (a). Since the element surface on the crimping side cannot freely expand and contract in the lateral direction, the diameter w ₁ of the element on the side not crimped to the metal case 5 and the diameter w ₂ of the element on the side crimped to the metal case
However, there is a disadvantage that the porous separator 9 is abnormally stressed and the leakage current characteristic of the product is deteriorated.

The object of the present invention is to prevent electric stress from being applied to the porous separator abnormally even when the pressure at the time of caulking and sealing is increased, and thus to prevent the leakage current characteristics of the product from being deteriorated and to provide an electric double layer having stable characteristics. To provide capacitors.

[Means for Solving the Problems]

The electric double layer capacitor of the present invention comprises an insulating rubber gasket made by vulcanizing and combining two upper and lower ring-shaped insulating rubbers, and a space inside the gasket which is sandwiched between the two ring-shaped insulating rubbers. A porous separator that divides into two spaces, a paste-like electrode made of powdered activated carbon containing an electrolyte solution, two electrodes closely packed in each of the two spaces in the gasket, and the gasket , A laminate formed by laminating at least two or more electric double layer capacitor elements consisting of two conductive separators enclosing the two paste-like electrodes in the gasket so as to cover the upper and lower openings, and two bottom surfaces. A metal cylindrical case in which one side is opened and the other side is closed,
A conductive case for accommodating the laminated body such that its closed bottom surface is electrically connected to one of the conductive separators of the laminated body, and an insulating material cylinder in which one of the two bottom surfaces is closed and the other is opened. An insulating case that is inserted into the conductive case such that its open surface faces the closed bottom surface of the conductive case, and insulates the side surface of the laminate from the conductive case. A first electrode plate disposed in contact with the outer surface of the closed bottom surface of the insulating case, the first electrode plate having lead terminals perpendicular to the closed bottom surface of the insulating case and facing outward; An electrode plate disposed so as to be sandwiched between a bottom surface and the laminated body, the second electrode plate having a lead terminal penetrating from the inside to the outside of the insulating case and the first electrode plate; Comprising the said The flexible case is provided with a caulking portion which is formed by curling the edge portion on the open surface side inward toward the first electrode plate so that the caulking portion makes contact with the first electrode plate. In the electric double layer capacitor configured to hold the pressure of, at least one sheet is provided between the laminated body and the closed bottom surface of the conductive case, and between the laminated body and the second electrode plate. The electric double layer capacitor is characterized in that a conductive sheet having elasticity is inserted.

〔Example〕

Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the present invention.

In FIG. 1, 10 is an element of an electric double layer capacitor. First, the six elements 10 described above are laminated in series to form a laminated body 2
To get Next, one sheet of conductive sheet 1 made of conductive silicone rubber punched out with the same diameter as the element 10 and having a thickness of 0.6 mm is stacked on the upper and lower sides of the laminated body 2 and housed in a conductive metal case 5, and then laminated. The body 2 is covered with the assembly electrode 4. Then, using the conventional means, the outer edge portion of the metal case 5 is caulked and sealed from above the laminated body 2 while applying a pressure of 150 kg / cm ^{2 which} is higher than the conventional one, and one embodiment of the present invention as shown in FIG. An example electric double layer capacitor was obtained.

Further, the electric double layer capacitor of the conventional example as shown in FIG. 5 was obtained by setting the pressure at the time of caulking and sealing to 150 kg / cm ² without inserting the conductive silicone rubber.

Table 1 shows the average value of the electrical characteristics of each 100p of the electric double layer capacitors of this example and the conventional example.

As is apparent from Table 1, in the conventional example, the pressure at the time of caulking and sealing was increased to 150 kg / cm ^{2 which} is 1.5 times as high as the conventional pressure, so that the leakage current value became about 3 times, but in the present example, The leakage current value was the same as the conventional one.

[Effect of device]

As described above, according to the present invention, by inserting at least one elastic conductive sheet above and below the laminated body of elements, a product having stable characteristics can be obtained even if the pressure at the time of caulking and sealing increases. There is an effect that is.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric double layer capacitor according to an embodiment of the present invention, FIG. 2 (a) is an enlarged sectional view when a laminated body having a conventional structure is pressed, and FIG. 2 (b) is the present invention. FIG. 3 is an enlarged cross-sectional view of a laminated body according to the present invention, FIG. 3 is an enlarged cross-sectional view of a conventional electric double layer capacitor element, FIG. 4 is a sectional view of a laminated body, and FIG. 5 is a conventional electric double layer capacitor. It is a sectional view of an example. 1 ... Conductive silicone rubber, 2 ... Laminated body, 3a ... 1st
Electrode plate, 3b ... second electrode plate, 3c ... insulating case, 4
...... Assembled electrode, 5 …… Metal case, 6 …… Conductive separator, 7 …… Non-conductive gasket, 8 …… Paste electrode, 9 …… Porous separator, 10 …… Element.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An insulating rubber gasket obtained by vulcanizing and combining two upper and lower ring-shaped insulating rubbers, and a space inside the gasket which is sandwiched between the two ring-shaped insulating rubbers into two upper and lower spaces. A porous separator to be divided, a paste-like electrode made of powdered activated carbon containing an electrolyte solution, two electrodes densely filled in each of the two spaces in the gasket, and upper and lower openings of the gasket. A laminated body formed by laminating at least two electric double layer capacitor elements each including an electrically conductive double layer capacitor element that covers the above portion and encloses the two paste-like electrodes in the gasket, and one of the two bottom surfaces is open. And the other is a closed metal cylindrical case, the closed bottom surface of which is in electrical communication with one of the conductive separator of the laminate, the laminate A conductive case to be stored, and a cylindrical case made of an insulating material in which one of two bottom surfaces is closed and the other is open, and the conductive surface is formed so that the open surface faces the closed bottom surface of the conductive case. Inserted in the case,
An insulating case for insulating the side surface of the laminated body from the conductive case, and an electrode plate arranged in contact with the outer surface of the closed bottom surface of the insulating case, the electrode plate being perpendicular to the closed bottom surface of the insulating case and extending outwardly. A first electrode plate having opposite lead terminals;
An electrode plate disposed so as to be sandwiched between the closed bottom surface of the insulating case and the laminated body, the electrode plate having a lead terminal penetrating the insulating case and the first electrode plate from inside to outside. And a second caulking portion provided on the electroconductive case, the caulking portion being deformed into an inward curl shape so that the edge portion on the open surface side is in contact with the first electrode plate. An electric double layer capacitor configured to hold a vertical pressure applied to the laminated body by a caulking portion, wherein the laminated body and the closed bottom surface of the conductive case, and the laminated body and the second An electric double layer capacitor, characterized in that at least one conductive sheet having elasticity is inserted between each electrode plate and the electrode plate.