JPH0414925Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention uses aluminum as an anode, an insulating oxide film of aluminum as a dielectric layer, and lithium or an alloy containing lithium as a cathode via an electrolyte. This invention relates to improvements in aluminum-lithium capacitors.

[Conventional technology]

An aluminum-lithium capacitor uses aluminum as an anode, and an insulating oxide film layer is formed on the surface of this aluminum by anodizing treatment, etc., as known for example from Japanese Patent Application Laid-open No. 61-184812. Then, this oxide film layer is used as a dielectric.

In addition, lithium or an alloy containing lithium is used for the cathode, this lithium layer is formed on the inner surface of the outer case of the capacitor, the anode part is housed in the outer case, and the necessary space is placed between the anode part and the cathode part. Accordingly, a separator is interposed, and an electrolytic solution containing lithium ions is interposed.

Unlike conventional electrolytic capacitors, this capacitor does not use aluminum for the cathode, so especially at low voltages, static electricity is generated due to the combined capacitance caused by the formation of a dielectric layer formed by the natural oxide film on the aluminum surface of the cathode. There is no reduction in capacity, and since lithium itself has a negative potential with respect to aluminum, it is possible to secure an interelectrode potential that is higher than the withstand voltage of the apparent oxide film, resulting in a low-voltage, small-sized, large-capacity capacitor. .

Figure 3 shows the structure of a conventional aluminum-lithium capacitor. The anode body 1 is made of a cylindrical strip of foil made of high-purity aluminum, and has a dielectric oxide film layer on the surface of the foil. It is formed by means such as anodic oxidation treatment. Further, an aluminum tab 2 is connected to a predetermined location of the foil of the anode body 1 by means such as welding, and is pulled out from the upper end surface of the anode body 1, and an anode lead wire 3 is further connected to the tip. There is.

The anode body 1 is impregnated with an electrolytic solution containing lithium ions, and is housed in a bottomed cylindrical metal case 4 having an inner diameter slightly larger than its outer diameter, with the anode lead wire 3 side facing outside. . A separator 5 made of paper, porous sheet, etc. is inserted between the inner bottom surface and inner peripheral surface of the outer case 4 and the anode body 1 in order to prevent short circuits and retain the electrolyte. .

Further, on the inner surface of the outer case 4, a layer of lithium or an alloy containing lithium, which will serve as a cathode, is formed by cladding treatment, doping, or the like. After housing the anode body 1, the outer case 4 is sealed at its open end with a disc-shaped elastic sealing body 6 made of synthetic rubber or the like, and the open end of the outer case is rolled up and sealed. Note that the anode lead wire 3 is drawn out from the through hole provided in the elastic sealing body 6 so that an electrical connection with the outside can be made.

On the other hand, the cathode lead wire 7 is connected to the bottom surface of the exterior case 4 in the opposite direction to the anode lead wire 3 by means such as welding.

By the way, when a capacitor has a structure in which both the anode and cathode lead wires are drawn out from both end faces of the capacitor body, the capacitor body must be placed horizontally when mounted on a printed wiring board, and the capacitor body must be placed horizontally, which means that the capacitor body has exclusive use on the board. There is a need for an aluminum-lithium capacitor with lead wires in the same direction, in which the lead wires are drawn out only from one end surface of the capacitor body, because the area is increased and high-density packaging is not possible.

An aluminum-lithium capacitor in which both the anode and cathode lead wires are drawn out in the same direction has a shape as shown in FIG. 1, for example. In a capacitor having such a shape, since the cathode is an exterior case, it is necessary to electrically connect the cathode to a cathode lead wire disposed in the upper sealed portion.

For example, in the case shown in FIG. 1, a plate-shaped metal member 16 is placed on the upper surface of the sealing body 18, and the upper end of the outer case 14 is curled to establish an electrical connection with the metal member 16. Member 16
Connect the cathode lead wire 19 to the terminal by means of welding or the like,
This creates a series of electrical paths.

[The problem that the idea aims to solve]

By the way, the plate-shaped metal member 16 needs to be devised to prevent short circuit due to contact with the anode lead wire 26. Therefore, a large diameter through hole 20 with a sufficient diameter is bored in accordance with the lead-out position of the anode lead wire 26 to prevent a short circuit accident. However, when assembling such a capacitor, the plate-shaped metal member 16 rotates and deviates from its predetermined position when the outer case is tightened or curled, which can cause a short circuit with the anode lead wire 26. There is a risk of causing this.

Therefore, in this invention, the following ideas were made for the purpose of obtaining a structure of the sealing part that can prevent such accidents.

[Means to solve the problem]

The aluminum-lithium capacitor of this invention uses a cylindrical aluminum anode body, which has a dielectric oxide film layer formed on its surface and is provided with a means for electrical connection with the outside, together with an electrolyte, and a lithium lithium capacitor that forms a cathode on the inside. Alternatively, it is housed in a bottomed cylindrical case having an alloy layer containing lithium, and the open ends of the front and rear exterior cases are sealed with a disc-shaped elastic member and a plate-shaped metal member, with the plate-shaped metal member serving as the outer surface. In an aluminum-lithium capacitor in which the outer case and the plate-shaped metal member are electrically connected by curling the opening end of the outer case, the plate-shaped metal member and the disk-shaped elastic member are connected to each other.
It is characterized by providing uneven surfaces that engage with each other.

[Effect]

The aluminum of this invention constructed in this way -
In the lithium capacitor, the sealing body 18 is fixed integrally with the plate-shaped metal member 16 and the elastic member 17 because the concave and convex portions are fitted therein. Since the elastic member 17 is made of a material such as synthetic rubber, it has a large coefficient of friction and is in close contact with the inner surface of the outer case 14, so that the sealing member 18 does not rotate due to tightening or curling.

Note that in this later-described embodiment, the plate metal member 16
The elastic member 17 is fixed to the elastic member 17 using a punched protrusion 22 formed by burring and a fitting recess 24, but the means of fixing is not limited to this, and the plate-shaped metal member is press-formed. A protrusion may be formed toward the elastic member 17 side for fitting, or the surface of the plate-shaped metal member may be knurled or the like to form irregularities on one side and be overlapped. Furthermore, in order to strengthen the adhesion,
An adhesive may be applied to this fixed surface.

〔Example〕

This invention will be explained below based on examples.

FIG. 1 is a sectional view showing the completed aluminum-lithium capacitor of this invention.
Further, FIG. 2 is an exploded perspective view showing the assembled state of the embodiment of FIG. 1.

First, as shown in the exploded perspective view of FIG. 2, the capacitor of this invention has an anode body 10 formed by winding a strip of aluminum foil into a cylindrical shape. The foil-shaped aluminum forming the anode body 10 has its surface etched to enlarge its surface, and its upper surface is anodized at a predetermined voltage.
A dielectric oxide film layer is formed. An aluminum tab 11 for drawing out the anode is connected to the anode body 10 at a predetermined position of the foil. , an anode lead wire 26 is connected by means such as welding.

The anode body 10 is made of a separator 12 which is impregnated with an electrolytic solution in which a lithium compound such as lithium borofluoride is dissolved in a solvent such as propylene carbonate, and whose outer peripheral surface is made into a cylindrical shape made of a porous material such as capacitor paper. is housed in a bottomed cylindrical metal exterior case 14 with a disk-shaped separator 13 arranged on the bottom surface.

On the inner surface of the metal exterior case 14, a cathode layer 15 made of lithium or an alloy containing lithium, which will serve as a cathode, is formed in advance by cladding treatment, doping treatment, or the like.

After the anode body 10 is housed in the outer case 14, the opening of the outer case 14 is opened with a plate metal member 16 having approximately the same diameter as the inner diameter of the outer case opening, and a cylindrical elastic member 17 also having approximately the same diameter. It is sealed by a sealing body 18 that combines the following.

Cathode lead wires 19 are connected perpendicularly to the plate surface of the plate metal member 16 at positions unevenly distributed from the center thereof by means such as welding. Further, a through hole 20 having a diameter sufficiently larger than that of the anode lead wire 26 is provided at a position where the anode lead wire 26 is drawn out from the anode body 10 . Further, this plate-shaped metal member 16 is provided with two punched holes 21, and these punched holes 21 are burred so that punched protrusions 22 protrude toward the joint surface side with the elastic member 17.

On the other hand, the elastic member 17 is provided with a small-diameter through hole 23 at a position where the anode lead wire 26 is drawn out, and a fitting recess 24 at a position where it engages with the punched projection 22 .

The plate metal member 16 and the elastic member 17 are the punched protrusions 22 of the plate metal member 16 and the elastic member 17.
With the plate metal member 16 side facing outward, the anode lead wire 26 of the anode body 10 is inserted into the small diameter through hole 23 of the elastic member 17 and the large diameter of the plate metal member 16. It is inserted into the through hole 20 of and attached to the opening of the exterior case 14.

After adhering the sealing body 18 to the opening of the exterior case 14, as shown in FIG.
A winding groove 25 is formed on the outer periphery of the outer case 14, and the opening end surface of the outer case 14 is curled inward.
Sealing is achieved by pressing the outer periphery of the plate-shaped metal member 16 at the opening periphery of the exterior case 14 .

[Effect of idea]

As described above, according to this invention, the plate-shaped metal member rotates during tightening and curling.
It is possible to prevent the end of the large diameter through hole and the anode lead wire from coming into contact and causing a short circuit.

In addition, since the sheet metal plate is firmly fixed to the elastic member, the strength of the sealing body is high.As a result, the thickness of the elastic member of the sealing body can be made thinner, allowing the height of the capacitor to be lowered and miniaturization. can be achieved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the completed state of the aluminum-lithium capacitor of this invention;
The figure is an exploded perspective view showing the assembled state of the capacitor shown in FIG. 1. FIG. 3 is a sectional view showing the structure of a conventional capacitor. 10... Anode body, 11... Aluminum tab,
12... Cylindrical separator, 13... Disc-shaped separator, 14... Exterior case, 15... Lithium cathode layer, 16... Plate-shaped metal member, 17... Elastic member, 18... Sealing body, 19... ...Cathode lead wire, 2
0...Large diameter through hole, 21...Punching hole, 22...
...Punching projection, 23...Small diameter through hole, 24...
Fitting recess, 25... winding groove, 26... anode lead wire.

Claims (1)

[Claims for Utility Model Registration] A cylindrical aluminum anode body with a dielectric oxide film layer formed on its surface and provided with an electrical connection means to the outside, together with an electrolyte, is made of lithium or lithium which forms a cathode on the inner surface. It is housed in a bottomed cylindrical case having an alloy layer containing lithium, and the open ends of the front and rear exterior cases are sealed with a disc-shaped elastic member and a plate-shaped metal member, with the front and rear plate-shaped metal members serving as the outer surfaces. The opening edge of the outer case is curled,
An aluminum-lithium capacitor in which an exterior case and a plate-shaped metal member are electrically connected, characterized in that the plate-shaped metal member and the disk-shaped elastic member are provided with uneven surfaces that engage with each other. Aluminum-lithium capacitor.