JPH06176972A - Block-shaped electric double layer capacitor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] With a simple structure and at low cost, it is possible to block a plurality of electric double layer capacitors, and it is also excellent in appearance. An object is to provide a block type electric double layer capacitor. A plurality of external leads 12a, 12b led out from a sealing member 17 side of a plurality of arranged capacitor bodies 18 are connected to a copper foil portion 20 provided on the surface of the printed board 19 on the sealing member 17 side, and a plurality of them are connected. Of the external leads 12a except the outermost end,
12b is configured so as not to project to the surface of the printed circuit board 19 opposite to the side of the sealing member 17, and the plurality of capacitor bodies 18 are connected to the heat-shrinkable resin tube 21.
It is configured such that a and 21b are united in a cross shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a characteristic of having a large capacitance using an electric double layer formed at the interface between a polarizable electrode and an electrolytic solution (quality). For example, the present invention relates to a block type electric double layer capacitor used for backing up a RAM (random access memory) during a power failure.

[0002]

2. Description of the Related Art A conventional block type electric double layer capacitor is constructed as shown in FIG. That is, a pair of polarizable electrodes 1a and 1b constituted by supporting a material made of graphite, activated carbon, carbon black, and some binder on an aluminum or stainless steel net or an etched foil is wound with a separator 2 interposed therebetween. The capacitor element 4 which is rotated and impregnated with the electrolytic solution 3 is housed in a bottomed cylindrical metal case 5,
The opening of the metal case 5 is sealed with a sealing member 6 made of rubber packing to form a capacitor body 7, and three capacitor bodies 7 are provided to further increase the withstand voltage to 5.5V. Line up at intervals,
Also, a pair of external leads 8a, 8b respectively led out from these capacitor main bodies 7 are connected to a printed circuit board 9 to connect three capacitor main bodies 7 in series, and these are made into a deep bottom case 10 made of synthetic resin. A sealing member 10a made of a synthetic resin and housed inside
Then, the block type electric double layer capacitor was sealed.

FIG. 6 shows a connection state between an external lead and a printed circuit board in a conventional block type electric double layer capacitor. A pair of external leads 8a and 8b provided on each of three capacitor bodies 7 are printed. Board 9
By penetrating through the through-hole provided in, and connecting all of the pair of external leads 8a and 8b to the copper foil portion 9a provided on the surface of the printed board 9 opposite to the capacitor body 7 by soldering, The three capacitor bodies 7 were connected in series.

In this case, of the pair of external leads 8a and 8b provided on each of the three capacitor bodies 7, the plus-side external lead 8a and the minus-side external lead 8b located at both ends are directly drawn upward and Other positive external lead 8a and negative external lead 8b
Was designed to cut the surplus after soldering the printed circuit board 9 to the copper foil portion 9a.

[0005]

However, in the above-mentioned conventional block type electric double layer capacitor,
A synthetic resin deep-bottomed outer case 10 is used to form a block of the three capacitor bodies 7 connected in series, resulting in high cost and a pair of capacitors provided on each of the three capacitor bodies 7. Of the external leads 8a and 8b are penetrated through the through holes provided in the printed circuit board 9, and the copper foil portion 9a provided on the surface of the printed circuit board 9 opposite to the capacitor body 7 has the pair of external leads 8a.
a and 8b are all connected by soldering, then
Since the pair of external leads 8a, 8b are configured to cut a surplus portion except for a part thereof, the pair of external leads 8a, 8b
There is a problem that the connecting portion between 8b and the copper foil portion 9a of the printed board 9 becomes uneven due to the cutting of the pair of external leads 8a and 8b and is exposed to the outer surface side of the printed board 9.

In view of the above problems, the present invention has a simple structure and can be formed at a low cost to form a plurality of electric double layer capacitors into blocks, and is excellent in appearance. An object of the present invention is to provide a block type electric double layer capacitor.

[0007]

In order to achieve the above object, a block type electric double layer capacitor of the present invention comprises a pair of polarizable electrodes to which external leads are respectively connected and wound with a separator interposed therebetween. The capacitor element configured by impregnating the electrolytic solution with the above is housed in a cylindrical metal case with a bottom, and the opening of this metal case is sealed with a sealing member to form a capacitor body. The external leads led out from the sealing member side of these capacitor bodies are connected to a copper foil portion provided on the surface of the printed circuit board on the sealing member side to connect a plurality of capacitor bodies in series, and external leads So as not to project from the surface of the printed circuit board opposite to the side of the sealing member, and further, the plurality of capacitor bodies are provided with a heat-shrinkable resin tube. In those that were united in a cross shape.

[0008]

According to the above structure, a plurality of capacitor bodies are arranged, and the external leads of these capacitor bodies are connected to the copper foil portion of the printed circuit board to connect the plurality of capacitor bodies in series, and When the capacitor body is bundled in a cross shape with a heat-shrinkable resin tube and a plurality of capacitor bodies connected in series is made into a block,
The conventional synthetic resin deep-bottomed outer case is used, because a plurality of capacitor bodies can be made into a block and an exterior with a simple configuration that simply ties the heat-shrinkable resin tube in a cross shape. Cost reduction can be achieved as compared with.

Further, when a plurality of capacitor bodies are connected in series, external leads led out from the sealing member side of the capacitor body are connected to a copper foil portion provided on the surface of the printed circuit board on the sealing member side to form a plurality of capacitors. The capacitor body is connected in series and the external leads do not project to the surface of the printed circuit board opposite to the sealing member side. The surface on the side opposite to the member side does not become uneven, so that when a plurality of capacitor bodies including the printed circuit board are bundled in a cross shape due to the heat shrinkage of the heat shrinkable resin tube described above. In addition, the outer surface of the printed circuit board can be covered with a heat-shrinkable resin tube in a flat state, resulting in a visual appearance. In which it is possible to obtain an excellent block-type double-layer capacitor of quality.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a block type electric double layer capacitor in one embodiment of the present invention.
1a and 11b are a pair of polarizable electrodes connecting a positive side external lead 12a and a negative side external lead 12b,
The pair of polarizable electrodes 11a and 11b are wound with the separator 13 interposed therebetween, and the electrolytic solution 14 is wound around them.
To form a capacitor element 15, and the capacitor element 15 is housed in a bottomed cylindrical metal case 16, and the opening of the metal case 16 is sealed with a sealing member 17 made of rubber packing. By doing so, the capacitor body 18 is configured.

The three capacitor bodies 18 are arranged, and the plus side external lead 12a and the minus side external lead 12b led out from the sealing member 17 side of the capacitor body 18 are connected to the printed circuit board 19 and this printed circuit board. By exposing the external leads 12a, 12b and the copper foil portion 20 by soldering while facing the through hole 19a provided in the copper foil portion 20 disposed on the surface of the sealing member 17 side of the sealing member 17, The individual capacitor bodies 18 are connected in series.

In this case, of the plus side external lead 12a and the minus side external lead 12b, the plus side external lead 12a and the minus side external lead 12b located at both ends are provided on the printed circuit board 19 and the copper foil portion 20. The external lead 12a on the plus side and the external lead 12b on the minus side are exposed to the through hole 19a, and the other external lead 12a and the external lead 12b on the negative side are exposed to the through hole 19a and are opposite to the sealing member 17 side of the printed circuit board 19. It is configured so that it does not project to the surface.

Thereafter, the three capacitor bodies 18 connected in series are bound together in a cross shape by the heat-shrinkable resin tubes 21a and 21b. In this case, first, the three connected in series are connected.
The series direction of the individual capacitor bodies 18 is bound by one heat-shrinkable resin tube 21a, and then the direction connecting the three capacitor bodies 18 and the printed circuit board 19 is bound by the other heat-shrinkable resin tube 21b. . As a result, the three capacitor bodies 18 connected in series are bound together in a cross shape by the heat-shrinkable resin tubes 21a and 21b.

When the three capacitor bodies 18 are arranged side by side, if the metal case 16 is brought into direct contact with each other, electrical insulation cannot be achieved. Therefore, when the three capacitor bodies 18 are connected in series, the capacitor body 18 located in the middle is disposed. The entire circumference of the metal case 16 is covered with a heat-shrinkable resin tube, or the entire circumference of the metal case 16 of the capacitor body 18 located on both sides is covered with a heat-shrinkable resin tube for electrical insulation. In this case, the heat-shrinkable resin tube does not necessarily have to cover the entire circumference of the metal cases 16, but may partially cover the metal cases 16 so as to function as a separator plate for ensuring a gap between the metal cases 16. This also applies to a heat-shrinkable resin tube for bundling, and it is not always necessary to bunch the entire circumferences of the three capacitor bodies 18.

FIG. 3 shows another embodiment of the present invention. Only points different from the embodiment of the present invention shown in FIG. 1 will be described. That is, in the embodiment shown in FIG. 3, both ends of the printed circuit board 19 are deleted, and the three capacitor bodies 18 are removed.
The positive side external lead 12a and the negative side external lead 12b located at both ends of the printed circuit board 19
It is arranged such that it is pulled out upward from the deleted portions at both ends of the printed circuit board 19 without being connected by soldering to the printed circuit board 19, and the other points are the same as those of the embodiment of the present invention shown in FIG.

The binding by the other heat-shrinkable resin tube 21b shown in FIG. 3 avoids the positive external lead 12a and the negative external lead 12b located at both ends, and both ends of the printed circuit board 19 are avoided. It is tied up with only the covering up to. With this configuration, it is possible to freely set the distance between the plus side external lead 12a and the minus side external lead 12b located at both ends.

FIG. 4 shows still another embodiment of the present invention. Only points different from the other embodiment of the present invention shown in FIG. 3 will be described. That is, in the embodiment shown in FIG. 4, the external leads 12a and 12b on the plus side and the minus side, which are led out from the sealing member 17 side of the capacitor body 18, are provided on the printed circuit board 19 and the surface of the printed circuit board 19 on the sealing member 17 side. Through hole 1 provided in the copper foil portion 20 arranged in
9a and the external leads 12a, 12
b and the copper foil portion 20 are connected by soldering, and a smooth concealing member 22 is disposed on the opposite side of the printed board 19 from the sealing member 17 side, and then the other heat-shrinkable resin tube. 21b, the concealing member 2
2 is bound so as to cover 2.

According to this structure, the surplus portions of the external leads 12a and 12b which penetrate the through hole 19a formed in the printed board 19 and project from the surface of the printed board 19 opposite to the sealing member 17 side are cut. In this case, the uneven traces can be hidden by the masking member 22, and the smooth masking member 22 is bound by the other heat-shrinkable resin tube 21b. It is possible to improve the quality of the product as it disappears.

According to the configuration of the embodiment of the present invention shown in FIG. 1 described above, the series direction of the three capacitor bodies 18 connected in series is bound by one heat-shrinkable resin tube 21a, and then 3 The direction connecting the individual capacitor bodies 18 and the printed circuit board 19 is set to the other heat-shrinkable resin tube 2
The three capacitor bodies 18 connected in series are bound together by the heat-shrinkable resin tubes 21a,
Since the heat-shrinkable resin tubes 21a and 21b are bundled in a cross shape by the heat-shrinking furnace 21b, the shrinkage is 3
Since the metal case 16 and the printed circuit board 19 that form the individual capacitor bodies 18 are covered, the bulkiness is reduced, the size can be reduced, and the cost can be obtained inexpensively.

When the three capacitor bodies 18 are connected in series, the external leads 12a and 12b led out from the sealing member 17 side of the capacitor body 18 are connected to the printed circuit board 1.
9 is connected to the copper foil portion 20 provided on the surface of the sealing member 17 side to connect the three capacitor bodies 18 in series, and the external leads 12a and 12b are on the side of the printed circuit board 19 opposite to the sealing member 17 side. Since it is configured not to project to the surface of the printed circuit board, the sealing member 1 on the outer surface side of the printed circuit board 19, that is, the printed circuit board 19 as in the conventional case.
The surface on the side opposite to the 7 side does not become uneven, so that the heat shrinkable resin tubes 21a, 21
Even when the three capacitor bodies 18 including the printed circuit board 19 are bundled in a cross shape due to the thermal contraction of b, the outer surface side of the printed circuit board 19 has the heat shrinkable resin tube 21
It can be coated in a flat state with a and 21b, and as a result, a product having excellent appearance can be obtained.

[0021]

As described above, according to the block type electric double layer capacitor of the present invention, a plurality of capacitor bodies are arranged, and the external leads of these capacitor bodies are connected to the copper foil portion of the printed circuit board to form a plurality of capacitors. When the main bodies are connected in series and a plurality of capacitor bodies are bundled in a cross shape with heat-shrinkable resin tubes, the heat shrinkage of the heat-shrinkable resin tubes occurs when the series-connected multiple capacitor bodies are blocked. With the simple structure of simply bundling in a cross shape, multiple capacitors can be made into a block and packaged, so the cost can be reduced as compared with the conventional case that uses a deep bottom packaged case made of synthetic resin. be able to.

When a plurality of capacitor bodies are connected in series, the external leads led out from the sealing member side of the capacitor body are connected to the copper foil portion provided on the surface of the printed circuit board on the sealing member side. The capacitor body is connected in series and the external leads do not project to the surface of the printed circuit board opposite to the sealing member side. The surface on the side opposite to the member side does not become uneven, so that when a plurality of capacitor bodies including the printed circuit board are bundled in a cross shape due to the heat shrinkage of the heat shrinkable resin tube described above. In addition, the outer surface of the printed circuit board can be covered with a heat-shrinkable resin tube in a flat state, resulting in a visual appearance. In which it is possible to obtain an excellent block-type double-layer capacitor of quality.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a block type electric double layer capacitor showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a connection state between external leads and a printed circuit board in the same capacitor.

FIG. 3 is a vertical sectional view of a block type electric double layer capacitor showing another embodiment of the present invention.

FIG. 4 is a vertical sectional view of a block type electric double layer capacitor showing still another embodiment of the present invention.

FIG. 5 is a vertical sectional view of a conventional block type electric double layer capacitor.

FIG. 6 is a perspective view showing a connection state between external leads and a printed circuit board in the conventional capacitor.

[Explanation of symbols]

 11a, 11b A pair of polarizable electrodes 12a Positive external lead 12b Negative external lead 13 Separator 14 Electrolyte 15 Capacitor element 16 Metal case 17 Sealing member 18 Capacitor body 19 Printed circuit board 20 Copper foil 21a, 21b Heat shrink Resin tube 22 Concealing member

Claims (3)

[Claims] 1. A capacitor element constructed by winding a pair of polarizable electrodes respectively connected to external leads with a separator interposed therebetween and impregnating these with an electrolytic solution, and housing the capacitor element in a cylindrical metal case having a bottom. Then, the opening of this metal case is sealed with a sealing member to form a capacitor body, and a plurality of this capacitor body are arranged side by side, and external leads led out from the sealing member side of these capacitor bodies are sealed in the printed circuit board. While connecting to the copper foil part arranged on the surface of the member side and connecting a plurality of capacitor bodies in series,
A block-type electric double-layer capacitor in which external leads are not projected to the surface of the printed circuit board opposite to the side of the sealing member, and the plurality of capacitor bodies are bundled in a cross shape with a heat-shrinkable resin tube. 2. Both ends of the printed circuit board are deleted, and one external lead on the plus side of a plurality of capacitor bodies,
2. The block type electric double layer capacitor according to claim 1, wherein one external lead on the minus side is not connected to the printed circuit board but is directly drawn from the deleted portions at both ends of the printed circuit board. 3. The block type electric double layer capacitor according to claim 1 or 2, wherein a concealing member is provided on a side of the printed circuit board opposite to the sealing member side.