JPH0355967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric double layer capacitor, and more specifically, to an exterior case for housing a coin-shaped capacitor cell.

[Conventional example]

Coin-shaped capacitor cells are mainly used as memory backup power supplies, etc., and can be said to be convenient in that the desired voltage can be easily obtained by stacking multiple coin-shaped capacitor cells, but they themselves do not have external terminals. When mounting on a circuit board, etc., the cell stack is housed in a bottomed cylindrical metal case via an insulating tube, etc., and an electrode plate with an external terminal is placed in the opening of the case. After that, caulk the same opening,
The apparent shape is the same as that of an electrolytic capacitor, and its external terminals are used to mount it on a circuit board, etc.

[Means for solving the problem] However, in the past, after storing the capacitor cells, electrode plates, etc. in the exterior case as described above, the opening of the case was caulked as a final step. If the pressure during caulking is too strong, liquid will leak from the capacitor cell, while if the caulking pressure is too weak, the electrode plate may rotate inadvertently within the case opening, which generally results in a high defect rate during the caulking process. The occurrence of caulking is high, and considerable skill is required to adjust the caulking pressure.

The present invention was made in view of the above-mentioned drawbacks of the conventional example, and its object is to provide an electric double layer capacitor in which the opening of the outer case can be sealed with a simple operation.

[Means for solving problems]

In order to achieve the above object, in this invention, the material of the bottomed cylindrical outer case is a metal plate having spring elasticity, and a plurality of slits are formed in the side wall thereof extending from the case opening edge to the bottom wall periphery. Equipped with an outer case.

[Effect]

When the bottom wall of the exterior case is pressed and deformed with the opposing openings facing each other, each elastic piece of the side wall divided by the slit opens outward, and the diameter of the opening of the case is expanded. After storing the capacitor cell, electrode plate, etc. in this state, when the pressing force on the bottom wall is released or a closing force is applied to each elastic piece, each elastic piece returns to its original cylindrical shape. , whereby the electrode plate is fixed within the case opening.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a perspective view of the exterior case applied to this electric double layer capacitor, and Figure 2 is a cross-sectional view of the case when it is opened and the capacitor cells, electrode plates, etc. are housed inside. , FIG. 3 shows a sectional view when the case is closed from the state shown in FIG. 2.

According to these figures, the exterior case 1 is composed of a bottomed cylindrical body having an opening 2 at one end, and the entire body is formed of a metal plate having spring elasticity.
A plurality of slits 5 are formed in the cylindrical side wall 3 of the exterior case 1, extending from the edge of the opening 2 to the periphery of the bottom wall 4 in parallel to the axis of the case. That is, the cylindrical side wall 3 is divided into a plurality of elastic pieces 3a by the slits 5, and in this case, the upper end of each elastic piece 3a has a curled part that is folded inward in a substantially inverted U shape. 3b is provided. Further, the bottom wall 4 of the exterior case 1 is formed into a substantially convex shape that projects downward. In this embodiment, the bottom wall 4 is formed into a trapezoidal shape, but it may also be formed into a convex spherical shape.

In the above configuration, the bottom wall 4 of the exterior case 1
When the elastic pieces 3a are pressed and deformed toward the opening 2, each elastic piece 3a opens as shown in FIG.
As the diameter expands, for example, each elastic piece 3a maintains its shape by itself. In this state, the cell stack 6, the first electrode plate 7, the second electrode plate 8, and the insulating plate 9 are housed in the outer case 1 in a predetermined order.

That is, first, the cell stack 6 is stored, and according to this embodiment, the cell stack 6 is made by stacking, for example, three capacitor cells 6a and covering the periphery with an electrically insulating heat-shrinkable sleeve 6b. Since the bottom wall 4 is formed into a convex shape facing downward as described above, there are no electrodes between one electrode surface of the cell stack 6 and the bottom wall 4. A conductive spacer 10 is interposed for electrical connection. Note that this spacer 10 is preferably a truncated conical cylindrical body generally called a disc spring.

Next, the first electrode plate 7 is placed on the other electrode of the cell stack 6, and the first electrode plate 7 is further placed on the other electrode of the cell stack 6.
A second electrode plate 8 is placed above with an insulating plate 9 interposed therebetween. Note that the first and second electrode plates 7 and 8 are provided with external terminals 7 formed by cutting and raising a portion thereof, for example.
a and 8a are arranged in series.

Thereafter, when a force is applied to each elastic piece 3a from the outside, each elastic piece 3a returns to its original state of being a cylindrical body due to its own elasticity at a predetermined angle. As a result, as shown in Figure 3,
The periphery of the uppermost second electrode plate 8 is pressed by the curled portion 3b of each elastic piece 3a, thereby fixing the cell stack 6.

In the above embodiment, the first and second electrode plates 7 and 8 are insulated by the insulating plate 9, and the sleeve 6b is used to insulate the peripheral surface of the cell stack 6 and the inner surface of the exterior case 1.
However, it is also possible to insulate both of the above using a bottomed cylindrical insulating tube 11 as shown in FIG. That is, this insulating cylinder 11
and a bottom wall 1 interposed between the second electrode plates 7 and 8
1a and a cylindrical side wall 11b that insulates between the circumferential surface of the cell laminate 6 and the inner surface of the exterior case 1 are integrally molded from synthetic resin, and the exterior case 1 is placed with its opening facing downward as shown in the figure. stored inside. Further, in the modification shown in FIG. 4, each capacitor cell 6a is arranged so that the electrode surface on the convex side faces the bottom wall 4 of the exterior case 1, unlike the above embodiment. According to the method, the conductive spacer 10 can also be omitted.

〔effect〕

As is clear from the description of the embodiments described above, according to the present invention, a plurality of slits are formed in the cylindrical side wall of the bottomed cylindrical body made of a metal plate having spring elasticity, extending from the edge of the opening to the periphery of the bottom wall. By using an exterior case in which the cylindrical side wall is divided into a plurality of elastic pieces, an innovative electric double layer capacitor can be obtained in which the capacitor cell, electrode plate, etc. can be easily assembled into the case.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an exterior case constructed according to the present invention, FIG. 2 is a cross-sectional view showing the case opened and containing a capacitor cell, an electrode plate, etc., and FIG. FIG. 4 is a sectional view showing another embodiment of the insulating member. In the figure, 1 is an exterior case, 2 is an opening, 3 is a cylindrical side wall, 3a is an elastic piece, 4 is a bottom wall, 5 is a slit,
6 is a cell laminate, 6b is a sleeve, 7 and 8 are electrode plates, and 9 is an insulating plate.

Claims (1)

[Claims] 1. A coin-shaped capacitor cell, first and second electrode plates connected to the electrodes of the capacitor cell, and an electrical connection between the electrode plates, in a bottomed cylindrical exterior case. In the electric double layer capacitor, the outer case is made of a metal material having spring elasticity, and the cylindrical side wall has a wall extending from the opening edge of the case to the bottom. A plurality of slits are formed parallel to each other along the periphery of the wall, and the opening of the case expands in diameter by pressing and deforming the bottom wall of the case toward the opposing opening. double layer capacitor. 2. The electric double layer capacitor according to claim 1, wherein the bottom wall of the outer case is formed in a convex shape that projects in a direction opposite to the opening when the case is closed. 3. The electric double layer capacitor according to claim 1, wherein the opening of the outer case is formed to curl inward. 4. The electric double layer capacitor according to claim 1, 2 or 3, wherein a conductive spacer is interposed between the bottom wall of the outer case and the capacitor cell. 5. The electric double layer capacitor according to claim 1, wherein the insulating member is an insulating plate interposed between the first and second electrode plates. 6. In claim 1, the insulating member has a bottom portion that insulates between the first and second electrode plates, and a cylindrical portion that insulates between the peripheral surface of the capacitor cell and the inner surface of the outer case. An electric double layer capacitor that is a cylindrical body with a bottom.