JPH0338010A - Electric double layer capacitor - Google Patents

Abstract

PURPOSE:To prevent the intrusion of moisture from the outside, and to stabilize damp-proof characteristics at a high temperature under high humidity by sealing a metallic base and a metallic block constituting a part of a sheathing case by using glass. CONSTITUTION:A metallic block 22 is inserted into the through-hole 21a of a metallic base 21 while pellet glass 23 is inserted between the metallic block 22 and the metallic base 21 and fused and unified at a high temperature. A closed-end cylindrical insulator 27 having the same through-hole as that 21a of the metallic base 21 is arranged onto the metallic base 21. A terminal board 24 composed of a metal is introduced onto the base of the insulator 27, and a machined elastic piece 24a having elasticity and the metallic block 22 are joined with one part of the terminal board 24. Accordingly, damp-proof characteristics at the high temperature under high humidity are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric double layer capacitor used for memory backup in various electronic devices.

BACKGROUND ART Conventionally, this type of electric double layer capacitor is manufactured by press-molding activated carbon particles, kneading them with a suitable binder and coating them on a metal current collector, as shown in Figure 6. A polarizable N pole 2.3 is formed by forming a sprayed aluminum layer 1 on the fiber, and the polarizable electrodes 2, 3 are connected to a metal case 5 made of stainless steel with an aluminum layer 4 formed on the inner surface. Store it inside the lid 6,
A separator 7 is interposed between the two polarizable electrodes 2 and 3, and the polarizable electrodes 2 and 3 are impregnated with an organic electrolyte to form a periphery of the opening of the metal case 5 and metal lid 6. By sealing with a gasket 8, an electric double layer capacitor body 9 was constructed.

Although electric double layer capacitors with this structure have a capacity on the farad order compared to electrolytic capacitors, etc., their withstand voltage is lower, so if a high voltage one is required, use the capacitor shown in Figure 7. For example, two electric double layer capacitor bodies 9 are stacked, a conductive spring plate 10 is placed thereon, and the upper end opening of the outer case 11 is placed on the outer periphery of the spring plate 10. By curling and caulking and fixing it, the two electric double layer capacitor bodies 9 were connected in series by the pressing force of the spring plate 10, and a high voltage of 5.5V rated voltage was obtained.

Problems to be Solved by the Invention The electric double layer capacitor shown in FIG. It has the advantage of being about three times more expensive than multilayer capacitors. However, electric double layer capacitors using organic electrolytes,
Since it is used at a voltage higher than the water decomposition voltage, there is a problem in that if moisture enters from the outside, the decomposition of water will cause the characteristics to deteriorate.

Moreover, the exterior case 11 in the conventional example shown in FIG.
Since the upper end opening is curled and fixed by caulking to the outer peripheral rising flange 10a of the spring plate 10, the intrusion of moisture from the outside is unavoidable. Under humid conditions, the function as an electric double layer capacitor is impaired and the capacitor cannot be put into practical use for a long period of time.

The present invention solves the above-mentioned conventional problems, and aims to prevent moisture from entering from the outside and to stabilize moisture resistance characteristics under high temperature and high humidity conditions.

Means for Solving the Problems In order to solve the above problems, the electric double layer capacitor of the present invention includes a metal base that has a through hole in a part and constitutes one pole, and a glass base that has a through hole in the metal base. A metal block that is fixedly arranged and constitutes the other pole, a terminal board that is connected to this metal block and has an elastic piece, and one or more electrical terminals arranged on this terminal board. A multilayer capacitor body, a spring washer placed on the top of the electric double layer capacitor body, and a bottomed cylindrical metal cap with a ceiling portion in contact with the spring washer and a flange portion at the lower end joined to the metal base. and an insulator for insulating between the metal cap and the electric double layer capacitor body and between the metal base and the metal plate, a metal base forming one pole, and a metal block forming the other pole. and lead terminals connected to each other.

Effects According to the above configuration, the metal base and metal block that constitute a part of the exterior case are sealed with glass, making it airtight, and therefore it is possible to reliably prevent moisture from entering from the outside. As a result, the moisture resistance under high temperature and high humidity conditions is improved.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 5, 21 is a metal base, and this metal base 21 has a through hole 21a in a part, and a triangular shape is formed on the upper surface of the stepped portion 21b on the outer periphery, as shown in FIG. 4a. The conical projection 21c is shaped like a ring.

Reference numeral 22 denotes a metal block, and a circular recess 22a for positioning when fixing the glass is formed by pressing on the connection surface with the lead terminal 29.

Further, the metal block 22 is fitted into the through hole 21a of the metal base 21, and a pellet glass 23 temporarily processed into a hollow cylindrical shape, for example, is inserted between the metal block 22 and the metal base 21. They are inserted and fused together at high temperature (1000°C) to integrate them.

Next, a bottomed cylindrical insulator 27 having a through hole the same as the through hole 21a of the metal base 21 is placed on the metal base 21.
A terminal plate 24 made of metal is placed on the bottom surface of this insulator 27, and an elastic piece 24a processed into a part of the terminal plate 24 and having elasticity is joined to the metal block 22.

Since the terminal plate 24 and the metal block 22 are connected through the elastic piece 24a, stress on the glass 23 due to the bulge of the metal case of the electric double layer capacitor body can be avoided.

Further, the insulator 27 may be divided into two parts, for example, a sheet shape and a cylindrical shape.

Two electric double layer capacitor bodies 25 are stacked on top of the terminal board 24, and the upper part of the electric double layer capacitor bodies 25 absorbs variations in parts and prevents excessive pressure from being applied to the electric double layer capacitor body 25. A spring washer 26 designed in a W-shape is mounted so as not to cover the multilayer capacitor main body 25.

Then, a metal cap 28 having a flange portion 28a at the lower end is inserted, and the ceiling portion of the metal cap 28 and the spring washer 26 are pressed into contact with each other, and as shown in FIG. 4a, the lower end of the metal cap 28 is The flange portion 28a,
A triangular pyramid-shaped ring-shaped protrusion 21c formed on the upper surface of the stepped portion 21b on the outer periphery of the metal base 21 is brought into contact with the ring-shaped protrusion 21c, and pressure is applied and current is applied to the ring-shaped protrusion 21c.
By intensively flowing the metal, heat is generated due to the contact resistance of both metals, that is, the metal cap 28 and the metal base 21, and as shown in FIG. That's what I do.

After complete sealing, the lead terminals are connected.Anode side lead terminal 29. The cathode side lead terminal 30 is the fifth
As shown in the figure, each wire is made of solder-plated iron wire or copper wire, and during welding, current is passed through in a concentrated manner to enable joining with a small pressure force and to strengthen the terminal strength after welding. Each tip 29a
, 30a are formed into a spherical shape by header processing.

This anode side lead terminal 29. As shown in FIG. 2, the cathode side lead terminals 30 are attached to the metal block 22 and the metal base 21 by resistance welding, respectively.

Effects of the Invention As described above, according to the present invention, the metal base and metal block that constitute a part of the exterior case are sealed with glass to make them airtight, thereby ensuring that moisture does not enter from the outside. As a result, moisture resistance under high temperature and high humidity conditions can be improved.

Furthermore, since a metal plate with an elastic connecting piece connected to a metal block is used, the glass part of the electric double layer capacitor body bulges due to the deterioration process that occurs during long-term use of the electric double layer capacitor. stress can be avoided. As a result, damage to the glass sealing portion can be reliably prevented.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an electric double layer capacitor according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the electric double layer capacitor, and Fig. 3 is a diagram showing an elastic connecting piece in the electric double layer capacitor. A cross-sectional view of the terminal plate portion, Figures 4a and 4b are partial cross-sectional views showing the sealing process between the metal base and metal cap of the electric double layer capacitor, and Figure 5 is a front view of the lead terminal in the electric double layer capacitor. , FIG. 6 is a sectional view of a conventional electric double layer capacitor main body, and FIG. 7 is a sectional view of a conventional electric double layer capacitor. 21...Metal base, 21a...Through hole, 22...Metal block, 23...
Glass, 24...Terminal board, 24a...
Elastic piece, 25...Electric double layer capacitor body,
26... Spring washer, 27... Insulator,
28...Metal cap, 28a...Flange part, 29.30...Lead terminal.

Claims (1)

[Claims] A metal base that partially has a through hole and constitutes one pole, a metal block that is fixed to the through hole of this metal base with glass and constitutes the other pole, and an elastic member that is connected to this metal block. A terminal board provided with a strip, one or more electric double layer capacitor bodies disposed on this terminal plate, a spring washer placed on the upper part of this electric double layer capacitor body, and this spring washer. a bottomed cylindrical metal cap with a ceiling portion in contact with the metal base and a flange portion at the lower end joined to the metal base; and a connection between the metal cap and the electric double layer capacitor body and between the metal base and the terminal plate. An electric double layer capacitor comprising an insulator for insulating between the two, and lead terminals each connected to a metal base forming one pole and a metal block forming the other pole.