JPH0436099Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electric double layer capacitor used as a backup power source or the like.

BACKGROUND ART An electric double layer capacitor used for the above-mentioned applications is made up of a suitable number of single cells a... each having positive and negative electrodes on the upper and lower surfaces stacked in electrical series, as shown in Fig. 5. a cap-shaped metal case d that houses the capacitor cell b;
and a terminal portion c that is closed while the capacitor cell b is housed in a metal case d. The terminal portion c consists of an insulating plate f and a pair of terminal plates g and h provided on both the front and back surfaces of the insulating plate f. One terminal g is electrically connected to one electrode of capacitor cell b through metal case d,
The other terminal plate f is directly electrically connected to the other electrode of the capacitor cell b. In the figure, e is the open end of the metal case d, and the open end e is U
It is bent into a letter shape and its tip is electrically connected to the terminal plate g.

Problems to be Solved by the Present Invention By the way, as shown in FIGS. 6A and 6B, the terminal plate g is formed by bending the lead terminal i, so that a notch j is formed in a part. has been
Further, as shown in FIG. 7, the insulating plate f had a planar portion k corresponding to the notch j of the terminal plate g.

Therefore, in the assembled state of the electric double layer capacitor, the tip of the opening side of the metal case d is connected to the terminal plate g.
In order to contact the exterior surface of the terminal plate g, a gap m corresponding to the thickness l of the terminal plate g is provided at the notch j of the terminal plate g.
is formed and lacks sealing performance, which limits the flux cleaning conditions during soldering, and furthermore, the performance is affected by changes in the external environment such as humidity.

This invention solves these conventional problems and
The purpose of the present invention is to provide an electric double layer capacitor with improved sealing performance and whose electrical characteristics do not change.

Means for Solving the Problems In order to achieve the above object, the present invention provides an electric double layer capacitor in which a capacitor cell is housed in a cap-shaped metal case and is closed at a terminal part. is composed of an insulating plate made of an elastic material and a pair of terminal plates provided on both the front and back surfaces of the insulating plate, and a flange is formed on the outer periphery of the insulating plate, and the flange is surrounded. In the state
The open end of the metal case is bent.

Effect According to the above structure, the flange is formed on the outer periphery of the insulating plate, and the opening end of the metal case is bent to surround the flange, so that the flange and the opening side of the metal case are bent. It is possible to maintain airtightness between the capacitor and the capacitor cell, thereby ensuring the sealing performance of the capacitor cell.

Embodiments Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIG. 2, reference numeral 1 denotes an electric double layer capacitor that can obtain a large capacity by utilizing the electric double layer phenomenon, and includes a capacitor cell 3 formed by laminating an appropriate number of single cells 2, and the capacitor. It consists of a cap-shaped metal case 5 for housing the cell 3, and a terminal portion 4 for sealing the capacitor cell 3 inside the metal case 5.

The terminal section 4 is composed of an insulating plate 6 and a pair of terminal plates 7 and 8 provided on both the front and back surfaces of the insulating plate 6. Furthermore, the terminal plate 7 is provided in the same way as in the conventional case (see Fig. 6A). and FIG. 1B), a notch 9 and a lead terminal 10 are formed.

As shown in FIG.
1. Further, the insulating plate 6 is formed with a protrusion 14 having a small hole 13 through which the lead terminal 12 of the terminal plate 8 can be inserted. In addition, the insulating plate 6
is molded from a highly elastic material such as rubber or urethane, and the length of the flange 11 is equal to that of the terminal plates 7 and 8.
The thickness of the plate is slightly larger than that of the plate. This is to ensure airtightness after assembly. Specifically, the flange 1
It is desirable that the length of the terminal plate 1 is approximately 0.1 to 0.3 mm larger than the thickness of the terminal plate 7.

The terminal portion 4 formed in this manner is placed on the capacitor cell 3 and then housed in the metal case 5. Then, the open end 15 of the metal case 5 and the flange 11 are caulked to produce an electric double layer capacitor. That is, since the open end 15 of the metal case 5 is bent into a U-shape while surrounding the flange 11, the electric double layer capacitor becomes a sealed type. Moreover, since the insulating plate 6 is highly elastic, it acts as a packing and has good sealing properties, preventing moisture from entering the interior and being affected by the outside air, so the quality is always stable. becomes. Note that the capacitor cell 3 is positioned by being locked in a recess 15 formed at the bottom of the insulating plate 6.

FIG. 3 shows another embodiment, in which the flange 1 of the insulating plate 6
1. The upper part is formed in an inclined shape. When the open end 15 of the metal case 5 is surrounded along the flange 11, the contact area between the flange 11 and the open end 15 of the metal case 5 becomes larger, and airtightness is further improved. There is. Also, the inclination angle θ is θ
It is preferable to set it to =12° to 15°.

Further, FIGS. 4A and 4B show yet another embodiment in which a stepped portion 16 is formed on the insulating plate 6 in order to facilitate positioning of the terminal plate 7 and the insulating plate 6. In other words, the stepped portion 16 has a notch shown in FIG. 2 (corresponding to the notch j shown in FIG. 6A).
will fit into it, allowing for positioning. It is also preferable to improve workability in this way.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the design can of course be changed without departing from the gist. Instead of forming the insulating plate 6 with an H-shaped cross section, it may be formed with a concave cross-section. The object of the present invention can also be achieved in the same manner.

Effects of the Invention As detailed above, the present invention provides an electric double layer capacitor in which a capacitor cell is housed in a cap-shaped metal case and is closed at a terminal part, in which the terminal part is made of an elastic material. and a pair of terminal plates provided on both the front and back sides of the insulating plate, and a flange is formed on the outer periphery of the insulating plate, and the metal case is arranged so as to surround the flange. Since the open end is bent, the sealing performance is improved, the waterproof effect is good, and there are no restrictions on flux cleaning conditions during soldering. It also has the remarkable effect of blocking the influence of outside air and preventing changes in initial characteristics.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the insulating plate of the present invention;
FIG. 2 is a sectional view showing an example of the electric double layer capacitor of the present invention, FIG. 3 is a sectional view of a main part showing another embodiment, and FIG. 4A is a plan view of an insulating plate showing yet another embodiment. Fig. 4B is a sectional view taken along the line XX in Fig. 4A, Fig. 5 is a sectional view showing a conventional electric double layer capacitor, Fig. 6A is a plan view of the terminal board, and Fig. 6B is a sectional view of the
FIG. 7 is a sectional view taken along line Y-Y in FIG. A, and FIG. 7 is a sectional view showing a conventional insulating plate. 3... Capacitor cell, 4... Terminal section, 5...
Metal case, 6... Insulating plate, 7, 8... Terminal board,
11...Brim portion, 15...Opening end.

Claims (1)

[Scope of Claim for Utility Model Registration] An electric double layer capacitor in which a capacitor cell is housed in a cap-shaped metal case and is closed at a terminal part, the terminal part being an insulating plate made of an elastic material. , a pair of terminal plates provided on both the front and back surfaces of the insulating plate, and a flange is formed on the outer periphery of the insulating plate, and the opening end of the metal case is folded in a state surrounding the flange. An electric double layer capacitor characterized by being curved.