JPH0658863B2 - Energy storage cell - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an energy storage cell such as an electric double layer capacitor or a battery having a coin (button) shape.

[Conventional technology]

Taking the electric double layer capacitor shown in FIG. 4 as an example, the capacitor is a dish-shaped metal case,
For example, a case body 1 made of stainless steel and a cap 2 also made of stainless steel, which covers the case body 1, are provided. Sheet-shaped polarizable electrodes 3a and 3b are attached to the bottoms of the case body 1 and the cap 2, respectively, via a conductive adhesive, for example. A separator 4 is disposed between the polarizable electrodes 3a and 3b to electrically insulate them. A gasket 5 made of, for example, rubber or synthetic resin is arranged between the inner peripheral surface of the case body 1 and the outer peripheral surface of the cap 2, and the periphery of the case body 1 is crimped so as to wrap the outer peripheral surface of the cap 2. There is.

[Problems to be Solved by the Invention]

The case body 1 and the cap 2 are attached with polarizable electrodes and impregnated with an electrolytic solution in different production lines, and then the cap 2 is inverted and covered with the case body 1 at, for example, a confluence point of each line. , Sent to the next caulking step. In that case, for example, the separator 4 is conveyed to the confluence point while being placed on the polarizable electrode 3a on the side of the case body 1, but the vibration causes the separator 4 to shift, which is shown in FIG. As described above, the polarizable electrodes 3a and 3b come into contact with each other, resulting in an electrical short circuit. However, in order to prevent this, for example, one method is to reduce the dimensional difference between the inner diameter of the case body 1 and the outer shape of the separator 4 as much as possible. A problem arises. That is, it becomes difficult for the separator 4 to enter the case body 1. Further, if it is forcibly pushed in, the force applied at that time causes breaks, holes or wrinkles in the separator 4.

Therefore, in the conventional art, as shown in FIG.
A sleeve 6 is formed on the inner peripheral edge of the gasket 5 along the inner peripheral surface of the cap 2, and the upper end surface 6 of the sleeve 6 is formed.
The separator 4 is pressed against the polarizable electrode 3b of the cap 2 at a. In this structure, in order to sufficiently hold down the separator 4, it is necessary to make the sleeve 6 thick.

However, by doing so, the diameter of the opening 7 in which the polarizable electrode 3a on the case body 1 side is accommodated becomes relatively small. This means that the size of the polarizable electrode 3a is limited and the electrostatic capacity (energy capacity) is sacrificed.

The present invention has been made in view of the above conventional circumstances, and an object thereof is to provide an energy storage cell provided with a gasket capable of reliably preventing the displacement of the separator arranged between the electrodes without sacrificing the original characteristics of the product. To provide.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the present invention, a case body formed in a dish shape and a cap that covers the case body are included, and an electrode is attached to each bottom portion of the case body, and a separator is provided between the electrodes. In an energy storage cell in which a gasket is interposed between the inner peripheral surface of the case main body and the outer peripheral surface of the cap, and the peripheral edge of the case main body is caulked to the cap side, the gasket is attached to the inner peripheral surface of the cap. A sleeve is formed along the inner side of the sleeve, and a flange is formed at the upper end of the sleeve so as to be bent inward in a substantially L-shape to press the peripheral edge of the separator toward the electrode on the cap side. .

[Action]

Since the pressing surface against the separator is secured by the upper surface of the flange, a sufficient pressing action is exhibited even if the thickness of the sleeve is reduced.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to FIGS. In these figures, the same parts as those shown in FIGS. 4 and 5 described above are designated by the reference numerals.

This example is for an electric double layer capacitor,
The gasket 10 used in the capacitor is made of an elastic electrically insulating ring member such as rubber or synthetic resin. That is, the ring member is provided on the inner peripheral edge of the opening 7 so as to enter along the spacer portion 11 arranged between the inner peripheral surface of the case body 1 and the outer peripheral surface of the cap 2 and the inner peripheral surface of the cap 2. In this case, the upper end of the sleeve 12 is integrally formed with a flange 13 that is bent in a substantially L-shape toward the inside.

This electric double layer capacitor is assembled as follows. Referring to FIG. 3 illustrating the manufacturing process, first, as shown in FIG. 3A, a polarizable electrode 3b is attached to the bottom of the cap 2 through, for example, a conductive adhesive, and The polarizable electrode 3b is impregnated with a predetermined electrolytic solution. Next, the separator 4 punched out from a mother sheet, for example, is placed on the polarizable electrode 3b (see FIG. 2B). Then, the gasket 10 is attached to the cap 2 as shown in FIG. As a result, the peripheral edge of the separator 44 is the flange 13 of the gasket 10.
Is pressed against the polarizable electrode 3b of the cap 2.
After that, the cap 2 is inverted as shown in FIG. 3D and is covered on the case body 1 (see FIG. 2E). Although not shown, a polarizable electrode 3a is attached to the bottom of the case body 1 like the cap 2 via, for example, a conductive adhesive, and the polarizable electrode 3a is impregnated with a predetermined electrolytic solution. Has been done. Then, FIG.
In the crimping step shown in FIG. 3, the peripheral edge of the case body 1 is crimped so as to wrap the outer periphery of the cap 2 while sandwiching the spacer portion 11 of the gasket 10.

As mentioned above, the separator 4 is the flange of the gasket 10.
Since it is pressed by 13, there is no risk of careless displacement due to vibration during transportation. In this case, by forming the flange 13 on the upper end portion of the sleeve 12, a sufficient pressing surface against the separator 4 is secured even if the thickness of the sleeve 12 is reduced. Therefore, the electrode storage volume of the opening 7 can be increased, and the capacitance can be increased accordingly.

Although the electric double layer capacitor has been described as an example,
The present invention is also applicable to, for example, primary batteries and secondary batteries.

〔The invention's effect〕

As described above, according to the present invention, by forming the sleeve for pressing the separator on the gasket and connecting the flange to the upper end of the sleeve, the electrode due to the displacement of the separator can be obtained without impairing the original characteristics of the product. It is possible to reliably prevent short-circuiting.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment applied to the electric double layer capacitor of the present invention, and FIG. 2 is an exploded sectional view of the embodiment,
3 (a) to 3 (f) are views for explaining the manufacturing process of the electric double layer capacitor, FIG. 4 is a sectional view showing a conventional example, and FIG. 5 is a sectional view showing a conventional gasket. In the figure, 1 is a case body, 2 is a cap, 3a and 3b are polarizable electrodes, 4 is a separator, 7 is an opening, 10 is a gasket, 11 is a spacer part, 12 is a sleeve, and 13 is a flange.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaname Kurihara 2-2-1 Tsujido Shinmachi, Fujisawa-shi, Kanagawa Elner Co., Ltd. (56) Bibliographic references Sho 57-192664 (JP, U)

Claims (1)

[Claims] 1. A case main body formed in a dish shape, and a cap put on the case main body. Electrodes are attached to respective bottom portions of the case main body, and separators are arranged between the respective electrodes to form a case main body. In an energy storage cell in which a gasket is interposed between the inner peripheral surface and the outer peripheral surface of the cap and the peripheral edge of the case body is caulked to the cap side, the gasket is inserted along the inner peripheral surface of the cap. A sleeve is formed, and an upper end portion of the sleeve is bent inward in a substantially L-shape to provide a flange for pressing the peripheral edge of the separator toward the electrode on the cap side. An energy storage cell characterized by being present.