JPH0438511Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to an electric double layer capacitor used in electronic circuits.

<Prior art> Figure 4 shows a longitudinal cross-sectional front view of a conventional electric double layer capacitor, in which 1 is a metal cylindrical casing, 2 is a capacitor cell installed inside the casing,
One to several single cells are stacked and mounted depending on the purpose. At that time, a backing plate 3 is attached to the bottom of the casing
guess. 4 and 5 are two terminal plates attached to one end of the casing 1, and the terminal plate 4 has a smaller diameter than the terminal plate 5. The end plate of the resin case 6 is sandwiched between the terminal plates 4 and 5, and its peripheral wall is inserted into the casing 1 through the opening of the casing 1 and placed over the outside of the capacitor cell 2.

Further, the terminals 7 provided on the inner terminal plate 4 pass through the end plate of the resin case 6, loosely fit into the holes 8 provided on the outer terminal plate 5, and protrude to the outside.
A terminal 9 is also provided at the terminal 9.

The end of the casing 1 is fixed by caulking with a protrusion 10 bent inward.

<Problems to be solved by the invention> In the conventional electric double layer capacitor as described above, when fixing the inner and outer terminal plates 4 and 5 to the casing 1, as shown in FIG. The molded electrically insulating resin case 6 must be installed between the two terminal plates 4 and 5, and the capacitor cell 2 must be housed within the resin case 6, which requires an extremely large amount of assembly time and requires close sealing. There was also the problem of inferiority.

<Means for solving the problem> This idea was made in order to solve the above problems. An injection hole is provided in the terminal board, and a fluid resin is injected through the injection hole. The resin is filled and hardened in the gap between the inner peripheral surface of the casing and the outer peripheral surface of the capacitor cell.

<Example> Hereinafter, an example of this invention will be described based on FIGS. 1 to 3 of the accompanying drawings.

Incidentally, the same parts as in the conventional example shown in FIG. 4 are given the same reference numerals, and the explanation thereof will be omitted.

In addition, in FIGS. 1 to 3, the terminal plate 5 side is drawn upward.

In the case of this invention, there are two holes 11 in the terminal board 4,
12 will be provided. Reference numeral 13 designates an electrically insulating plate having two holes 14 and 15 that match the holes 11 and 12 of the terminal plate 3, and a hole 16 through which the terminal 7 passes.

However, the holes 15 and 16 may be shared.

Further, the terminal plate 5 is provided with an injection hole 17 that matches the hole 14 of the insulating plate 13, and a hole 18 larger than the holes 15 and 16 so that the terminal 7 passing through the hole 18 does not come into contact with the terminal plate 5. At the same time, this hole 18
The hole 15 of the insulating plate 13 is made to face.

When assembling the capacitor of this invention, first attach the patch plate 3 inside the casing 1 as before,
Next, a capacitor cell 2 consisting of a predetermined number of single cells is
into the casing 1.

Then, the terminal plate 4, the insulating plate 13, and the terminal plate 5 are fitted into the terminal side opening of the casing 1 in this order. At this time, the terminal plate 4 is inserted into the capacitor cell 2.
While pressing against the upper surface, the opening side periphery of the casing 1 is bent inward while slightly compressing the cell 2 crimped to the terminal plate 4 against its elasticity so that the periphery does not contact the inner surface of the casing 1. Each plate 4,
5 and 13 are fixed inside the casing 1.

When this state is reached, care must be taken to prevent the terminals 7 of the terminal board 4 from coming into contact with the inner periphery of the holes 18 of the terminal board 5.

Thereafter, liquid resin 20 is injected into the injection hole 17 of the terminal plate 5 from the spout 19 as shown in FIG.

After confirming that the resin 20 has filled the gap between the cell 2 and the casing 1 and overflowed from the injection holes 17 and 18, the injection is finished.

During this injection, the air inside the casing 1 is discharged to the outside through the holes 18.

<Effects> As described above, this invention provides an injection hole in the terminal plate attached to the casing, injects fluid resin through the injection hole, and injects the resin into the gap between the inner circumferential surface of the casing and the outer circumference of the capacitor cell. Since it is filled with and hardened, there is no need for a separate resin case to be inserted into the casing like the conventional one shown in FIG.

Therefore, the process of manufacturing the resin case can be omitted, and even during assembly, there is no need for a time-consuming process such as attaching the resin case, resulting in lower manufacturing costs.

In addition, since liquid resin is injected and hardened, it has the advantage of being highly airtight.

Furthermore, by sealing the inside of the casing, chemical and physical changes within the capacitor cell are reduced, which not only stabilizes the characteristics but also improves reliability.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional front view showing one embodiment of this invention, Fig. 2 is an exploded perspective view of the same terminal board and insulating plate, Fig. 3 is a perspective view showing the resin injection state, and Fig. 4 is a conventional FIG. 2 is a longitudinal sectional front view of an electric double layer capacitor. 1...Casing, 2...Capacitor cell,
4, 5...Terminal plate, 7, 9...Terminal, 17...Injection hole.

Claims (1)

[Scope of utility model registration request] In an electric double layer capacitor in which a terminal side opening of a cylindrical casing with a capacitor cell mounted therein is closed with a terminal plate, an injection hole is provided in the terminal plate,
An electric double layer capacitor characterized in that a fluid resin is injected through the injection hole to fill the gap between the inner peripheral surface of the casing and the outer periphery of the capacitor cell and harden the resin.