JPS607478Y2 - Unidirectional terminal electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to fix the elements of a terminal-to-terminal unidirectional electrolytic capacitor, maintain airtightness, and reduce the number of assembly steps.

In general, an electrolytic capacitor with terminals in the same direction is constructed by connecting an internal lead terminal 1 to each of the anode electrode foil and the cathode electrode foil by crimping or other methods, as shown in Fig. 1, and winding the terminals with electrolytic paper interposed therebetween. After forming the capacitor element 2, the electrolytic paper is impregnated with an electrolytic solution by impregnation, etc., and the internal lead terminal 1 is connected to the external terminal 4 attached to the terminal plate 3 of a baking plate or molded plate. The capacitor element 2 is inserted into a bottomed cylindrical case 6 made of aluminum or the like into which thermoplastic amorphous resin 5 is injected as a fixing material for the element 2, and the terminal plate 3 is fitted into the opening of the case 6. There is one in which the opening of the case 6 is sealed and the terminal plate 3 is fixed and sealed.

However, during long-term life tests or during use, the above-mentioned conventional products use a rubber gasket as an airtight material in the sealing part to ensure airtightness between the terminal board 3 and the case 6, but the airtight material deteriorates. The explosion-proof valve mechanism 7 cannot be provided at the bottom of the capacitor case because the reliability is lowered due to deterioration of various characteristics and because the element fixing material is injected into the bottom of the capacitor case.

Therefore, the explosion-proof valve mechanism 7 is provided in a part of the terminal board 3.

As mentioned above, the rubber etc. deteriorate after long-term use, resulting in extremely unstable operating characteristics.

The present invention eliminates the above-mentioned drawbacks, simplifies assembly, and improves quality.

Hereinafter, the present invention will be explained in detail based on the embodiments shown in FIGS. 2 to 4.

2 and 3 are cross-sectional views of the electrolytic capacitor with terminals in the same direction according to the present invention, 11 is a lead terminal provided on the anode electrode foil and the cathode electrode foil, respectively, 12 is a capacitor element,
13 is a lid, 14 is an external terminal, 15 is a thermoplastic amorphous resin fixing material such as attack polypropylene, 16 is a case, and the external terminal 14 is installed in advance at one end opening of the cylindrical case 16 made of metal such as aluminum. is attached, and a terminal sealing plate 17 connected to the lead terminal 11 of the capacitor element 12 is fitted and sealed by winding.

Note that the capacitor element 12 is housed in a case 16 as shown in the figure.

The capacitor element 12 is fixed by a fixing member 15, and the other opening of the case 16 is covered with a thin aluminum plate of about 0.2 to 1.0771171 thickness and made of the same material as the case 16, and the outer edge of the upper part of the opening is heated. It is preferable that the lid 13 or the case be sealed with an adhesive, resin, plastic sheet, etc. to seal the hermetically sealed portion to improve the sealing.

Note that 18 in the figure is an explosion-proof valve installed in the lid 13, but in case 1
6 may be provided without limitation.

Further, in the above embodiment, the cylindrical case 16 is made of a metal such as aluminum, but it may be made of an insulating material or other metal as long as the adhesion between the terminal sealing plate 17 or the lid 13 and the case 16 can be improved and sealed. .

Furthermore, as shown in FIG. 4, a protrusion 19 may be provided at one end of the opening of the case 16 to which the lid 13 is attached to improve the close contact between the lid 13 and the case 16, thereby sealing the case 16.

In the electrolytic capacitor of the present invention constructed as described above, the terminal sealing plate part, which conventionally caused airtightness during long-term life tests, is completely sealed by injecting a fixing material such as attack-tic polypropylene resin. , there is no airtight failure from the terminal sealing plate attachment part.

At the same time, the capacitor element can also be fixed.

Furthermore, conventional explosion-proof mechanisms cannot be installed at the bottom of the case due to fixing materials, and most of them use a terminal sealing plate made of at least a baked plate and rubber, and holes are drilled in the baked plate to prevent the internal pressure from rising and cause the internal gas to leak. The terminal passed through the hole, broke the rubber on the top surface, and escaped to the outside, but as mentioned above, the operation was unstable due to the phenomenon of deterioration of the rubber. Since one opening is provided with a lid on the other opening, an explosion-proof mechanism can be easily provided on the case or the lid.

Therefore, the explosion-proof mechanism does not deteriorate over time, and its operating characteristics are also very excellent.

Moreover, since the terminal sealing plate portion to which the external terminal is attached is filled with the capacitor element fixing material, when the capacitor element is attached to the circuit board, the space is upward, and the capacitor element can be stably attached.

As mentioned above, the present invention makes the terminal sealing plate mounting part airtight, and an explosion-proof mechanism can be installed in the case, and there is no factor of deterioration over time, improving reliability, and making it suitable for industrial and practical use. It is of great value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional unidirectional electrolytic capacitor between terminals, Fig. 2 is a sectional view of a unidirectional electrolytic capacitor of the present invention, and Fig. 3 is a sectional view of a unidirectional electrolytic capacitor of the present invention. Cross-sectional view of another embodiment. FIG. 4 is a cross-sectional view of the vicinity of the case opening of another embodiment of the terminal-to-terminal unidirectional electrolytic capacitor of the present invention. 11...Output lead terminal, 12...Capacitor element, 13...Lid, 14...
External terminal, 15... Thermoplastic amorphous resin (fixing material), 16... Case, 17... Terminal sealing plate, 18... Explosion-proof valve, 19...protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) A terminal sealing plate 17 is fitted into the opening at one end of the cylindrical case 16 made of aluminum or the like, and the sealing plate 17 is sealed by caulking or the like. A lead terminal 11 drawn out from the capacitor element 12 is connected to the terminal 14 . (b) The capacitor element 12 is housed in the case 16, and the case 16 is filled with a fixing material 15 such as active polypropylene.
is fixed, the lead terminal 11 of the capacitor element 12 and the connecting portion between the terminal 11 and the external terminal 14 are fixed, and the fitting portion between the case 16 and the terminal sealing portion is sealed and fixed. (c) Furthermore, the lid 13 is fitted into the other opening of the case 16 and sealed by caulking and welding. The terminal-to-terminal unidirectional electrolytic capacitor configured as described above.