JPS607475Y2 - polar electrolytic capacitor - Google Patents

Description

[Detailed description of the invention] The invention relates to a polar electrolytic capacitor in which a capacitor element is hermetically sealed with an exterior film. Specifically, the invention relates to a polar electrolytic capacitor in which a capacitor element is hermetically sealed with an exterior film. Specifically, the invention is to effectively display the polarity of an anode lead and a cathode lead led out in the same direction from a capacitor element. The purpose is to

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings of FIGS. 1 and 2.

In FIGS. 1 and 2, 1 is a capacitor element,
This capacitor element 1 has a flat shape constructed by winding an anode foil made of aluminum to which an anode lead 1a is connected and a cathode foil made of aluminum to which a cathode lead 1b is connected via a separator. The lead 1a and the cathode lead 1b are drawn out from the same end face of the capacitor element 1 in the same direction.

2 is an exterior film that seals and exteriorizes this capacitor element 1;
The capacitor element 1 has an anode lead 1a and a cathode lead 1b attached to the thermocompression bonded portion of the exterior film 2. 3 and pulled out to the outside.

Further, in the thermocompression bonded portion 3 of the exterior film 2 from which the anode lead 1a and the cathode lead 1b are drawn out, the corner portion on the anode lead la side is folded back inward to provide a folded portion 2a.

In addition, the anode lead la of the exterior film 2 and the cathode lead 1
The other thermocompression bonded parts 3 from which b is not pulled out are also folded inward to provide folded parts 2b and 2c, but these folded parts 2b and 2c are designed to make the overall shape neat and small. This is what is being done.

That is, the polarity is displayed by the folded portion 2a.

Here, the exterior film 2 should be one that has excellent solvent resistance to the electrolyte that is impregnated into the capacitor element 1, and has sufficient adhesion at the lead-out portions of the anode lead 1a and cathode lead 1b. Although certain requirements are met, it is preferable to laminate an ionomer resin film on both sides of a metal film such as aluminum or on one side of the capacitor element 1 side.

Further, this laminate structure is not limited to a two-layer or three-layer laminate structure of a metal film and an ionomer resin film, and can be used in combination with other resin films.

As is clear from the above structure, in the polar electrolytic capacitor according to the present invention, the capacitor element 1 is hermetically sealed with the exterior film 2, and the thermocompression bonded part 3 for making the exterior film 2 into a bag shape is folded inward. Since the polarity is indicated by the folded part 2a, the polarity may be indicated by the length of the lead or by printing on the main body, as has been conventionally done with general electrolytic capacitors. Compared to other methods, it is easier to determine the polarity, and this eliminates the possibility of connection errors when connecting to external devices.
Moreover, since no special material is required for polarity display, it can be realized at low cost.

As described above, the present invention has high practical value in that it is possible to perform very effective polarity display for a polar electrolytic capacitor in which a capacitor element is hermetically packaged with an exterior film.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance of a polar electrolytic capacitor according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the capacitor with a portion cut away. 1... Capacitor element, 1a... Anode lead, 1b... Cathode lead, 2...
Exterior film, 2a...Folded part, 3...
...Thermocompression bonding part.

Claims (1)

[Scope of utility model registration request] An exterior film laminated with at least two types of films including an ionomer resin film that is made into a bag shape by thermocompression bonding the peripheral edges of three locations, and an exterior film that is hermetically sealed by the exterior film and is pulled out by being sandwiched between the thermocompression bonded parts. 1. A polar electrolytic capacitor comprising a capacitor element having an anode lead and a cathode lead drawn out in the same direction, the thermocompression bonded portion of the exterior film being folded back inward, and polarity indicated by the folded portion.