JPH0438510Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an electric double layer capacitor, and particularly to an electric double layer capacitor using a lead wire.

(Prior Art) Examples of conventional electric double layer capacitors that form the background of this invention are disclosed in, for example, Japanese Patent Publication No. 59-53694 and Japanese Utility Model Publication No. 60-38277. Similarly, an example of an electric double layer capacitor which is the background of this invention has been proposed as the invention in Japanese Utility Model Application No. 60-22073.

(Problem that the invention aims to solve) However, in such electric double layer capacitors, the case is not sufficiently sealed, so for example, soldering flux may enter the case, or the board may be damaged after soldering. When used as a part of equipment that is used in high-moisture environments, such as washing machines or washing machines, there is a problem in that moisture may enter the case, leading to defects or short circuits.

Therefore, the main purpose of this invention is to provide an electric double layer capacitor with high hermeticity.

(Means for solving the problem) This invention consists of a cell laminate, a first terminal board that is tightly attached to the lower surface of the cell laminate, an insulating plate that is closely attached to the lower surface of the terminal board, and a first terminal board that is closely attached to the lower surface of the insulating plate. The cell laminate, the first terminal board, the insulating plate, and the second terminal board are housed therein such that the upper surface of the second terminal board and the cell laminate are in close contact with the end surfaces thereof, and
In an electric double layer capacitor including a case that is caulked with the lower surface of the second terminal plate, the opening at the lower end is formed so that the insulating plate has elasticity and the area of its main surface is larger than the area of the cross-sectional shape of the case. The electric double layer capacitor is characterized in that the periphery of the case is plastically deformed by caulking and comes into close contact with the inner wall of the case to seal the case.

(Function) The insulating plate plastically deforms its periphery and comes into close contact with the inner wall of the case, so it acts as a seal to seal the case.

(Effects of the invention) According to this invention, since the insulating plate acts as a gasket to seal the case, the sealing performance is improved, and soldering flux and the like are prevented from entering the case. In addition, the high airtightness makes it difficult for liquids to enter, and the moisture resistance and wash resistance are high, making it difficult for defects and short circuits to occur even when used in cleaning after soldering or in areas with a lot of moisture.

Furthermore, since the structure for improving airtightness is simple, reliability is also increased.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIGS. 1 and 2 show an embodiment of this invention, with FIG. 1 being a sectional view thereof, and FIG. 2 being a sectional view showing its assembled state.

This electric double layer capacitor 10 includes a cell laminate 12. Since the cell stack is well known, its explanation will be omitted here.

On the lower surface of the cell stack 12, a first terminal plate 14 having a diameter substantially equal to the lower surface of the cell stack 12 is arranged on a disk.
is closely attached. From the lower surface of this first terminal plate 14, a lead wire 16 for drawing out which becomes a + side terminal is formed downward.

A disk-shaped insulating plate 18 is closely attached to the lower surface of the first terminal plate 14 . This insulating plate 18 is
For example, it is made of a material that has elasticity and deforms plastically when force is applied, such as silicone rubber or silicone sheet, and the area of its main surface is larger than the area of the opening of the case, which will be described later. . That is, the diameter of the insulating plate 18 is made larger, for example, by 0.6 mm than the inner diameter of the case, thereby increasing its area.

Note that a lead wire insulating portion 19 is formed on the lower surface of the insulating plate 18 so as to wrap around the lead wire 16 and penetrate downwardly through a second terminal plate to be described later.

Further, on the lower surface of the insulating plate 18, a disc-shaped first
The second terminal plate 2 has approximately the same diameter as the terminal plate 14 of
0 is formed. A lead wire 22 for drawing out, which serves as one terminal, is formed downward from the lower surface of the second terminal plate.

In this way, the insulating plate 18 is connected to the first terminal plate 14
and the second terminal board 20, and the first
Since the terminal 14 and the second terminal 20 have smaller diameters than the insulating plate 18, the circumference 18 of the insulating plate 18
a is not laminated by the first terminal 14 and the second terminal 20 and is exposed in a circular shape.

In this way, the cell stack 12, the first terminal plate 1
4. As shown in FIG. 2, the laminate 24 composed of the insulating plate 18 and the second terminal board 20 is arranged so that the upper surface of the cell laminate 12 is in close contact with its end surface.
For example, it is inserted and housed in a case 26 made of metal such as aluminum. On this occasion,
The periphery 18a of the insulating plate 18 is plastically deformed and bent in a direction opposite to the direction in which the laminate 24 is inserted into the case 26, and comes into close contact with the inner wall of the case 26. The opening 26a of the case 26 is caulked with the lower surface of the second terminal board 20 to hold the laminate 24.
In this way, the periphery 18a of the insulating plate 18 is
Since it is in close contact with the inner wall of the case 26, it acts as a seal to seal the case 26. Therefore, this electric double layer capacitor 10 has high airtightness.

In this embodiment, the diameter of the insulating plate 18 is 0.6 mm larger than the inner diameter of the case 26 to increase its area, but the area of the main surface of the insulating plate depends on the opening area of the case, the shape of the terminal plate, and Depending on the degree of caulking of the case 26, etc., it is determined to the extent that a high degree of sealing can be maintained. Further, in this embodiment, the cell laminate 12, the first terminal plate 14, the insulating plate 18, and the second terminal plate 20 have circular cross sections, but they may be arbitrarily deformed into other shapes. Good too.

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of this invention, with FIG. 1 being a sectional view thereof, and FIG. 2 being an illustrative view showing its assembled state. In the figure, 10 is an electric double layer capacitor, 1
2 is a cell laminate, 14 is a first terminal board, 18 is an insulating board, 20 is a second terminal board, 26 is a case, 26
a indicates an opening.

Claims (1)

[Claims for Utility Model Registration] 1. A cell laminate, a first terminal plate closely attached to the lower surface of the cell laminate, an insulating plate closely attached to the lower surface of the terminal plate, and a first terminal plate closely attached to the lower surface of the insulating plate. The cell laminate, the first terminal board, the insulating plate, and the second terminal board are housed therein such that the upper surface of the second terminal board and the cell laminate are in close contact with the end surfaces thereof. , and in an electric double layer capacitor including a case whose lower end opening is caulked with the lower surface of the second terminal plate, the insulating plate has elasticity and its main surface is larger than the area of the opening of the case. 1. An electric double layer capacitor, characterized in that the area of the capacitor is large, the periphery of the capacitor is plastically deformed by caulking of the case, and the capacitor is brought into close contact with an inner wall of the case to seal the case. 2. The electric double layer capacitor according to claim 1, wherein the insulating plate is disc-shaped and has a diameter larger than the inner diameter of the case.