JPH0231780Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to the improvement of a flat electrolytic capacitor, and particularly relates to a sealing structure in which the airtightness is improved by doubling the airtightness maintaining member.

[Conventional technology]

In recent years, there has been a strong demand for smaller and lighter electrolytic capacitors due to the shape, dimensions, etc. of the housings of electronic devices. As a means of responding to this request,
It has been considered to form an electrolytic capacitor in a flat shape to reduce the vertical dimension.

Generally, an electrolytic capacitor is formed by housing a capacitor element impregnated with an electrolytic solution in a bottomed cylindrical outer case made of metal such as aluminum. The electrolyte that is impregnated into this capacitor element is
Its properties change greatly depending on moisture and impurities. Therefore, a sealing member made of elastic rubber or the like is attached to the opening of the exterior case, and
The opening end and side surface of the exterior case are crimped and deformed, and are fitted into the sealing member to seal the exterior case.

[Problem to be solved]

However, the conventional sealing structure of electrolytic capacitors requires a space for the caulked part of the outer case to fit into the sealing member, making it difficult to shorten the vertical dimension. This sealing structure cannot be applied to electrolytic capacitors.

The purpose of this invention is to hermetically isolate the flat capacitor element and electrolyte from the outside.
The purpose of the present invention is to provide a sealing structure that realizes a flat plate electrolytic capacitor.

[Means to solve problems]

A rectangular bottom plate, a rectangular lid plate, a protruding piece that is integrally formed with the bottom plate and bent at right angles to the bottom plate, and an elastic rubber installed inside the protruding piece. It consists of a frame and a rectangular auxiliary tool made of hard plastic placed inside the frame, and a flat capacitor element is placed in a space surrounded by the bottom plate, the lid plate, and the auxiliary tool. It is characterized in that the capacitor element storage space is sealed by storing the capacitor element, and by bending the tip of the protruding piece, it is anchored to the peripheral edge of the cover plate.

〔Example〕

Next, an embodiment of this invention will be described according to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of this invention. The capacitor element 1 has a flat external appearance. This capacitor element 1 is formed by winding and laminating strip-shaped electrode foils, and leads 9 for leading out the electrodes are led out from the end face.

The bottom plate 2 and the cover plate 3, which have a rectangular external appearance, are formed by coating a metal plate such as iron or copper with aluminum or the like.
Concave and convex portions 7 and 8 are linearly arranged to increase the mechanical strength of the bottom plate 2 and the lid plate 3.

A projecting piece 6 is integrally formed on the periphery of the bottom plate 2. This projecting piece 6 is erected at right angles to the bottom plate 2 and forms the side surface of the capacitor body. Furthermore, a rectangular frame 4 made of elastic rubber or the like is placed around the inside of this projecting piece 6, and an auxiliary tool 5 made of hard plastic is placed inside this frame 4. The frame portion 4 and the auxiliary tool 5 together with the projecting piece portion 6 secure a space in which the flat capacitor element 1 is accommodated.

Further, the projecting piece portion 4 fits into a convex portion 8 provided on the peripheral edge of the bottom plate 2 and the cover plate 3, thereby making airtightness more reliable.

An electrode lead 9 led out from the flat capacitor element 1 is electrically connected to an external connection terminal 10 provided on a part of the bottom plate 2 .

A cover plate 3 formed in the same shape as the bottom plate 2 is placed on top of the airtight maintenance member 4 and the auxiliary tool 5 with the flat capacitor element 1 housed in the storage space. The protruding piece 6 integrally formed with the bottom plate 2 has a second
As shown in the figure, it is bent in the direction of arrow B,
It comes into contact with the frame part 4. Further, as shown in FIG. 3, the tip portion of the protruding piece 6 is pressed in the direction of arrow C and joined to the periphery of the cover plate 3, thereby sealing the storage space for the capacitor element 1.

[Effect]

As shown in FIG. 2, pressure is applied to the frame portion 4 toward the housing space for the capacitor element 1 in the process of bending the projecting piece portion 6 in the direction of arrow B.
Further, as shown in FIG. 3, in the process of pressing the tip of the projecting piece 6 against the peripheral edge of the cover plate 3 from the direction of arrow C to join, this pressing also causes the frame 4 to move inward. Pressure is applied to leave behind. However, since the frame part 4 is locked by the auxiliary tool 5 disposed inside, it may bend inward or
It never moves.

Furthermore, when mechanical stress is applied from the outside to the completed flat electrolytic capacitor, especially when stress is applied to the frame portion 4 forming the side surface portion, the frame portion 4 is moved by the auxiliary tool 5. It is firmly locked on the inside, and there is no possibility that external mechanical stress will extend to the internal capacitor element 1.

[Effect of idea]

As described above, this invention includes a rectangular bottom plate and a lid plate, which are formed integrally with the bottom plate, and
A projecting piece bent at right angles to the bottom plate, a rectangular frame made of elastic rubber installed inside this projecting piece, and a rectangular frame made of hard plastic placed inside this frame. A flat capacitor element is housed in a space surrounded by the bottom plate, the lid plate, and the auxiliary tool, and by bending the tip of the protrusion, the lid plate The capacitor element storage space is sealed by being moored to the periphery of the capacitor, so even for flat electrolytic capacitors with extremely short vertical dimensions, the frame can be firmly held by the auxiliary tool, and the capacitor element housing space can be sealed. It is possible to ensure airtightness and improve life characteristics.

In addition, the side surface of the flat electrolytic capacitor obtained by this invention has a two-layer sealed structure, so
The airtightness becomes stronger, making it easier to block out moisture, impurities, etc. from the outside air, making it possible to improve life characteristics and maintain stable characteristics over a long period of time.

In addition, when manufacturing a flat electrolytic capacitor with this sealing structure, in the step of erecting the protrusion part or the step of mooring the tip of the protrusion part to the cover plate, pressure applied inward may be applied. Since the frame part does not move, it is possible to prevent airtightness failure, and there is no risk of damaging the internal capacitor element, making it easy to improve the yield in the manufacturing process.

As described above, this invention is a useful idea for realizing a highly reliable flat electrolytic capacitor by maintaining sufficient airtightness even in a flat electrolytic capacitor having an extremely short vertical dimension.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view showing the sealing structure of the flat electrolytic capacitor according to this invention, Figures 2 and 3
The figure is a sectional view illustrating an embodiment of the sealing structure according to this invention. Note that common parts and parts are given the same reference numerals. DESCRIPTION OF SYMBOLS 1... Capacitor element, 2... Bottom plate, 3... Cover plate, 4... Frame part, 5... Auxiliary tool, 6... Protruding piece part,
7, 8... uneven portion, 9... lead, 10... terminal.

Claims (1)

[Scope of utility model registration request] A rectangular bottom plate, a rectangular lid plate, a protruding piece that is formed integrally with the bottom plate and bent at right angles to the bottom plate, and an elastic rubber installed inside the protruding piece. It consists of a frame and a rectangular auxiliary tool made of hard plastic placed inside the frame, and a flat capacitor element is placed in a space surrounded by the bottom plate, the lid plate, and the auxiliary tool. A sealing structure for a flat plate electrolytic capacitor, characterized in that the capacitor element storage space is sealed by bending the tip of the protruding piece and mooring it to the peripheral edge of the cover plate.