JP2510200Y2 - Solid electrolytic capacitor with fuse - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a solid electrolytic capacitor with a fuse, and more particularly to a protective structure for a cathode external terminal including a fuse.

[Conventional technology]

Generally, solid electrolytic capacitors are used in various electronic circuits, and the failure rate is small, but in the unlikely event that a solid electrolytic capacitor fails in the circuit, a short circuit often occurs. May generate heat and burn out. In order to protect other circuit elements when a short-circuit failure occurs in this capacitor, a mechanism that opens when short-circuited is required, and a means using a fuse is generally known.

As a conventional technique, as shown in FIG. 2, an insulating resin 4 is applied to the half surface of the cathode layer 1a on the outer periphery of the capacitor element 1, and the cathode external terminal 5 is mounted on the insulating resin 4.
There is a solid electrolytic capacitor in which an insulating resin 4 is placed between the cathode external terminal 5 and the cathode external terminal 5 and a fuse 6 is attached between the cathode external terminal 5 and the cathode layer 1a.

[Problems to be solved by the device]

In this conventional solid electrolytic capacitor with fuse, since the insulating resin 4 and the cathode external terminal 5 are not connected, a gap is created between the insulating resin 4 and the cathode external terminal 5 as shown in FIG. There were problems such as large external dimensions and blown fuses.

The object of the present invention is to prevent the disconnection of the cathode external terminal and the insulating resin, which are the above-mentioned conventional drawbacks, and as a result, to reduce defects of a large size, and to prevent fuse cutting due to mechanical stress. To provide.

[Means for solving the problem]

In the solid electrolytic capacitor with a fuse of the present invention, an L-shaped anode external terminal is welded to an anode lead wire derived from a capacitor element composed of a metal member having a valve action, and formed on the peripheral surface of the capacitor element. In a solid electrolytic capacitor with a fuse formed by coating an insulating resin on the formed cathode layer, placing a cathode external terminal on the insulating resin, and connecting the cathode external terminal and the cathode layer by a fuse across the insulating resin. The heat-shrinkable insulating sleeve is mounted so as to sandwich the cathode external terminal and the fuse with the capacitor element.

〔Example〕

Next, the present invention will be described with reference to the drawings. 1 (a) to 1 (d) are perspective views showing a manufacturing process of an embodiment of the present invention. In the figure, 1 is a solid electrolytic capacitor element (hereinafter abbreviated as element), 1a is a cathode layer provided on the outer periphery of the element, 2
Is an anode lead wire derived from the element 1 by erection or welding, 3 is an anode external terminal, 4 is an insulating resin, 5 is a cathode external terminal, 6 is a fuse, 7 is a heat-shrinkable insulating sleeve, and 8 is an exterior resin. .

First, as shown in FIG. 1 (a), powder of a metal having a valve action such as tantalum or aluminum is formed into a desired shape,
Anodizing is performed, and then a semiconductor layer such as manganese dioxide, graphite, and a silver paste layer are sequentially deposited,
The element 1 having the cathode layer 1a as the outermost layer is formed. The anode lead wire 2 led out from the element 1 and the anode external terminal 3 formed in an L shape are connected by welding. Next, the insulating resin 4 is coated on the half surface of the cathode layer 1a on the side opposite to the lead-out direction of the anode external terminal 3 by means such as dipping.

Next, as shown in FIG. 1 (b), on the insulating resin 4,
The cathode external terminal 5 is placed so that the insulating resin 4 is sandwiched between the element 1 and the cathode external terminal 5, and the fuse 6 is attached to the cathode layer 1a and the cathode external terminal 5 in the longitudinal direction of the element 1 by a conductive adhesive or soldering. Connect to.

Next, as shown in FIG. 1 (c), a heat-shrinkable insulating sleeve 7 is passed from the side opposite to the lead-out direction of the anode lead wire 2 so as to enclose the cathode external terminal 5 and the fuse 6, and
Heat the heat-shrinkable insulating sleeve 7 to element 1 by heating at 0 ° C for 20 seconds.
Attach to.

Further, as shown in FIG. 1 (d), a solid electrolytic capacitor with a fuse of the present invention is formed by insulating and covering with a covering resin 8 such as an epoxy resin.

[Effect of device]

As described above, according to the present invention, since the cathode external terminal and the fuse are wrapped by the heat-shrinkable insulating sleeve, it is possible to prevent the cathode external terminal and the insulating resin from coming off. (1) Large defects can be reduced.

(2) No blowout of fuse due to mechanical stress.

And so on, and its industrial value is great.

[Brief description of drawings]

1 (a) to 1 (d) are perspective views showing a manufacturing process of a solid electrolytic capacitor with a fuse according to an embodiment of the present invention, FIG. 2 is a perspective view of a conventional solid electrolytic capacitor with a fuse, and FIG. FIG. 3 is a top view of a state in which there is a gap between the cathode external terminal and the insulating resin in FIG. 2. 1. Solid electrolytic capacitor element 1a Cathode layer 2.
Anode lead wire, 3 ... Anode external terminal, 4 ... Insulating resin,
5 ... Cathode external terminal, 6 ... Fuse, 7 ... Heat-shrinkable insulating sleeve, 8 ... Exterior resin.

Claims (1)

(57) [Scope of utility model registration request] 1. An L-shaped anode external terminal is welded to an anode lead wire derived from a capacitor element composed of a metal member having a valve action, and on a cathode layer formed on the peripheral surface of the capacitor element. Part of the is covered with insulating resin,
Further, in the solid electrolytic capacitor with a fuse, wherein the cathode external terminal is placed on the insulating resin, and the cathode external terminal and the cathode layer are connected by a fuse across the insulating resin, the cathode external terminal and the fuse are A solid electrolytic capacitor with a fuse, characterized in that a heat-shrinkable insulating sleeve is mounted so as to be sandwiched between the capacitor element and the capacitor element.