JPS626674Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a capacitor with a safety device.

Generally, when a capacitor deteriorates, the dielectric loss tangent increases, causing the capacitor element to expand, which in turn causes the capacitor case to expand, leading to dielectric breakdown and the risk of igniting the capacitor or burning out attached equipment.

A conventional capacitor that eliminates the above-mentioned drawbacks is disclosed in Japanese Utility Model Application Publication No. 53-23537. That is, as shown in FIGS. 1 and 2, the terminal lead 3 is brought into contact with the flat surface of the capacitor element 1 via the insulating plate 2, and the connection between the terminal lead 3 and the capacitor element 1 is made as shown in FIGS. The element 1 is connected to the electrode surface 4 by a conductive foil 5 which is easily cut by expansion of the element 1. 6 is a case, and 7 is a sealing resin.

Generally, the direction of expansion of the capacitor element due to deterioration of the capacitor element 1 is mostly in the direction of the flat surface of the element 1, and the expansion states are A, B, C, F, etc. as shown in FIG.
G, B, C, and the case where the G and G parts are the whole;
It is partially deviated in one of the F, G, and E parts, and expansion into the D and E parts is a rare condition.

However, in a capacitor with the above structure, expansion of portions D and E, which is a rare condition, may occur.
Or, in the case of expansion of the parts C and F, the tensile force is reliably applied to the conductive foil 5 and the conductive foil 5 is reliably cut, thereby exhibiting a sufficient function as a safety device. However, in the case of expansion of a part far from the conductive foil 5, that is, parts A and H, the terminal follows the expansion and only moves in the direction of the dotted line, and no tensile force is applied to the conductive foil 5, and the conductive foil 5 is not cut, thereby ensuring safety. The function of the device could not be fully demonstrated, and the risk of ignition of the capacitor itself due to destruction of the capacitor or burnout of attached equipment had not been completely eliminated.

The present invention has been made in view of the above points, and the external lead-out portion of the lead-out terminal is connected to the conductive lead-out portion on the side opposite to the conductive lead-out portion formed on both end faces of the capacitor element to which the conductive foil is connected. It is an object of the present invention to provide a capacitor with a safety device in which the conductive foil can be reliably cut even if any part of the capacitor element expands by arranging the capacitor elements in a parallel state.

An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 3, for example, a capacitor element 11 is formed by alternately overlapping plastic films and electrode foils or by overlapping and winding metallized plastic films to form a flat shape.Metallicon is applied to both end faces of the capacitor element 11 to form a conductive lead portion 12a, 12b
form. Next, the conductive lead-out portions 12a, 12b
One end of the conductive foil 13a is connected to one of the conductive lead portions 12a, and the other end is brought to one side surface of the capacitor element 11 to connect the lead terminal 14. Further, a conductive foil 13 is also provided on the other conductive lead-out portion 12b.
One end of b is connected and the other end is connected to the capacitor element 11.
Similarly, attach the lead terminal 14 to the other side of the
Connect. As shown in FIG. 4, the lead terminal 14 has a band portion 15 connected to the conductive foils 13a and 13b and arranged parallel to the side surface of the capacitor element 11, and a bent portion 16 continuous with the band portion 15. It is composed of an external drawer section 17 formed through the external drawer section 17. In this case, the external drawer portion 17 constituting the drawer terminal 14
Conductive foils 13a and 1 are connected to each other through a band 15 disposed parallel to the side surface of the capacitor element 11, respectively.
The conductive lead-out parts 12a, 12b, which are located on the opposite side to the conductive lead-out parts 12a, 12b to which the conductive lead parts 3b are connected, are arranged in parallel with either of the conductive lead-out parts 12a, 12b. As shown in FIGS. 5 and 6, an insulating plate 18 is disposed between the capacitor element 11 and the lead-out terminal 14, and the insulating plate 18 is housed in a case 19, and the cavity of the case 19 is filled with resin 20. be.

When the capacitor element 11 deteriorates in the capacitor with a safety device configured as described above,
The element 11 expands, but as shown in _FIG .
When the conductive foils _13a and 13b are expanded, tensile force is applied to both the conductive foils _13a and _13b , making them easy to cut.
The tensile force against the arrow 30, as shown in FIG.
Although it acts in the 31 and 32 directions, the conductive foil 1
3a and 13b are connected to the capacitor element 11, and each external lead-out part 17 constituting the pull-out terminal 14 fixed with the resin 20 is located on the side surface of the capacitor element 11. Conductive lead-out portions 12a, 12b provided on both end faces of the capacitor element 11 to which conductive foils 13a, 13b are connected via a band portion 15 disposed parallel to the conductive lead portions 12a, 12b.
Since the conductive lead parts 12a and 12b are located on the side opposite to the conductive lead parts 12a and 12b, the external lead parts 17 are located parallel to the conductive lead parts _12a and _12b , respectively. It acts as a stopper, and there is no pulling force in the direction of arrow 32, and the tensile force concentrates in the directions of arrows 30 and 31, pulling the conductive foils 13a and 13b. Cut off the current to.

As for the structure of the lead-out terminal, a punched protrusion 22 and a punched hole 23 are formed in the external lead-out part 21 as shown in FIG. 6, or a punched hole 24 is formed as shown in FIG. 7. The fixation with the conductive foil becomes even stronger, and its role as a stopper against the tensile force in the direction of the arrow 32 shown in FIG. Furthermore, if the band portion 25 constituting the pull-out terminal is formed so that the width gradually narrows from the bent portion 26 toward the tip end as shown in FIG. The tensile force becomes even stronger, which makes cutting the conductive foil easier and strengthens the safety function.

Furthermore, if the conductive foil 27 is provided with a weak point 28 as shown in FIGS. 9A to 9C, cutting when the element expands can be further ensured.

As described above, according to the present invention, the external lead-out parts constituting the lead-out terminals connected to the conductive lead-out parts formed on both end faces of the capacitor element via conductive foil are arranged parallel to the side faces of the capacitor element. The conductive foil is connected to the conductive foil through the strip, and an insulating plate is placed on the side of the conductive pull-out opposite to the conductive pull-out and parallel to the conductive pull-out, and an insulating plate is arranged between the capacitor element and the lead-out terminal. By storing the capacitor and filling the cavity with resin, even if the capacitor element deteriorates and any part of the element expands, the conductive foil can be quickly cut and the circuit will be opened. It is possible to obtain a highly safe capacitor with a safety device that can prevent the destruction of the capacitor and the ignition of the capacitor and the burnout of attached equipment.

[Brief explanation of the drawing]

Figures 1 and 2 are related to conventional reference examples.
The figure is a perspective view showing a capacitor element, Figure 2 is a plan sectional view showing a capacitor with a safety device, and Figures 3 to 9.
The figures relate to the present invention, and FIG. 3 is a perspective view showing a capacitor element with a safety device attached, FIG. 4 is a perspective view showing a lead-out terminal, FIG. 6 is a partial cross-sectional perspective view of the capacitor shown in FIG. 5, FIGS. 7 to 9 are perspective views showing lead terminals according to other embodiments of the present invention, and FIG. 10 is a perspective view of another embodiment of the present invention. FIG. 3 is a front view showing each conductive foil according to an example. 11... Capacitor element, 12a, 12b...
Conductive lead-out portion, 13a, 13b, 27... conductive foil,
14... Output terminal, 15, 25... Band part, 16,
26...Bending part, 17, 21...External drawer part, 1
8...Insulating plate, 19...Case, 20...Resin,
22... punching protrusion, 23, 24... punching hole,
28... Weak point, 30, 31, 32... Arrow.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A flat capacitor element using plastic film as a dielectric, a conductive lead-out portion formed on both end faces of the capacitor element, a conductive foil connected to the conductive lead-out part, and a conductive foil connected to the conductive lead-out portion. A lead-out terminal having a band disposed parallel to the side surface of the capacitor element connected to the foil, and an external lead-out part formed through a bent part continuous with the band, and the lead-out terminal and the capacitor. It comprises an insulating plate disposed between elements, a case housing the capacitor element, and a resin filled in a cavity of the case, and each of the external draw-out parts is opposite to the conductive draw-out part to which the conductive foil is connected. A capacitor with a safety device, characterized in that the capacitor is located in parallel with each of the conductive lead-out portions located on the sides. (2) The capacitor with a safety device according to claim 1 of the utility model registration claim, characterized in that the external lead-out portion of the lead-out terminal is provided with a single punched hole or a punched protrusion. (3) The capacitor with a safety device according to claim 1 or 2 of the utility model registration, characterized in that the width of the band portion of the lead-out terminal is gradually narrowed from the bent portion toward the tip end.