JPS5947723A - Metallized film condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a metallized film capacitor, in which an insulation margin is provided at the end of a vapor-deposited electrode in the 111 direction, an insulation groove is provided in the length direction, and a fusing groove is provided between the insulation groove. By providing a slot, when a part of the dielectric of a metallized film capacitor is partially destroyed, the short-circuit current that flows causes the vapor deposited film in contact with the sprayed metal to scatter, releasing that part from the circuit and preventing accidents. The object of the present invention is to provide a metallized film capacitor which can stably obtain the self-protection function of the present invention and which exhibits less capacitance loss.

Conventionally, metal 1 film capacitors are made of aluminum on a plastic film body such as polypropylene film, polyethylene terephthalate film, polystyrene film, or polycarbonate film.
A capacitor element is made by overlapping two layers of metallized plastic film that has been vacuum-steamed to a full thickness of 0.02 to 0.03μ, leaving an insulating margin at the edge of the film.・I1. ．． Solder on both end faces of the capacitor element! II-Lead 1 (metal sprayed on the edges, forming a contact layer, connecting lead wires or terminals to the No. 1 electrode extraction part, storing it in a case, vacuum drying, impregnating with insulating oil, and then drying it once a month.) 4 metallized film capacitors
b has been completed.

A capacitor with a 111N metallized film formed in this way has a dielectric defect during a voltage application test due to insulation defects contained in the plus boot film and $QH edge defects formed during metal deposition of the electrode. Partial destruction of the film may occur. However, since the electrode is an ultra-H:9 layer formed by vacuum evaporation, the energy at the time of partial breakdown causes the dielectric strength of the vaporized metal layer to be +'iJ, so the insulation generally recovers, and the capacitor cannot be used subsequently. There will be 11 Noh plays. At the θ) stage, the deterioration of the dielectric is negligible, but the destruction progresses little by little, with some parts of the destruction as a core. Therefore, there was a danger that smoke and ignition would eventually occur.

In order to improve this drawback, an insulating groove (insulating margin) is provided at the widthwise end on one or both sides of the dielectric film, as shown in FIG. At the same time, the metallized film with insulating grooves is wound so as to separate the electrode into a plurality of islands in the length direction of the film, and electrode extension parts are formed on both end faces of the metallized film. A metalized film capacitor is shown.

However, in order to obtain a sufficient self-safety function, it is necessary to minimize the interval between the insulating grooves that divide the electrode into a plurality of parts. When the dielectric material is a polypropylene film or a polyethylene terephthalate film and the capacitor capacity is large, there is a risk that thermal breakdown due to self-heating may occur rapidly.

The present invention overcomes these drawbacks and provides a 4Vi capacitor that is structurally simple, has a self-protection function, is highly stable in terms of quality, and has good productivity.

That is, metallized film 1 has #(!', id, l
A fusing slot 4 (hereinafter referred to as F margin) shown in FIGS.
7'Ci (referred to as slot), and make this at least I
fk lu, ] and wind it 1.・A contact layer is formed by metal spraying, and the ends r and leads Ig 1i-ti1tρ (hl) are coated with resin. Since the F slot 4 is provided between the capacitors 3, a self-protection function can be stably obtained even if the capacitor capacity h↓° is large or if the capacitor breaks down due to thermal damage.
It was possible to obtain a highly productive dry capacitor with little decrease in capacity -Qj.

Hereinafter, the present invention will be explained in detail based on examples.

Example 1 Zinc deposited film resistance 1+f+', 6Ω/mouth thickness 9 It
Insulation 1'+ on 71L metallized polypropylene film 1
V+! 3 pitch is set at 50 nun, and during this period F
A slot 4 is formed, the length 5 between them is 5 mm, and the length for the base is 25 mm.
A lLF:'1 capacitor element was obtained, contact layers were formed on both end faces of the element by metal spraying, terminals were connected, and the element was covered with lard.

Note that the F slot 1116 was set to 1.5 rmn in consideration of voltage resistance and capacity loss. Further, a metallized film 1 without the F slot 4 was used as a comparison sample. Furthermore, the electricity charging test is Zhou T! The applied voltage was 480 VAC, and the application time was 1000 f-Ir.

Furthermore, the self-safety function test was conducted at an ambient temperature of 100℃.
The dielectric was forcibly destroyed by applying cumulative overvoltage, and the presence or absence of smoke was confirmed at this time.

The results are shown in Table 1.

Table 1 Example 2 Medium 1) Vapor deposition j simulated resistance III' (6Ω/RO1) (S9μ
771 metallized polypropylene film 1 is provided with a pitch of insulating grooves 3 of 50 rrtm'C, an F slot 4 is formed between them, and the length 5 and the sum of different metallization) and f rums are combined. iY j'A 51i,
Equipped with a F condenser element. 1 of F slot at this time
116 and test conditions are the same as in (Example 1).

The results are shown in Table 2.

If the distance between the insulation grooves is made smaller in two directions, it is easy to obtain the insulation margin (1), but since this groove is the actual insulation margin, it becomes the capacitance loss of the capacitor. On the other hand, if the distance is increased, it becomes difficult to obtain a self-safety function. For this reason, an F slot was provided to increase the distance between the insulation grooves and to make it easier to obtain a 1' self-safety function. As a result, by providing the F slots, the self-security function can be stably obtained, and the total length between them is preferably 25FIII+ or less.

Furthermore, if the resistance value of the deposited film exceeds 15 Ω/hole, it becomes unstable over time, so it is desirable that the resistance value be less than this value.

In the embodiment described above, the F slot 11
16 was set to 1.5 rran, but considering the withstand voltage performance and capacity loss, it was set to 0.5 to 2. OTJI is appropriate. Furthermore, as a result of considering the vaporized young metal plastic film, it was found that when the entire vapor deposition area is aluminum, it is subdued!
[Compared to (), the capacity reduction was relatively large, but there was no difference in self-security ti +'r@r.

Furthermore, in the present invention, an F slot is provided between the insulating grooves, and the self-protection function and capacitance change in a continuous electrification test are investigated depending on the conditions, and the dielectric is polystyrene film. , fltl) Plastic films such as polyethylene terephthalate film, polycarbonate film, and polystyrene film can also be used to obtain similar results. Therefore, according to the present invention, since the dry process has a self-safety function, 4'r1 reliability and safety are improved. A capacitor with high productivity and excellent productivity can be obtained, and the economic effect is extremely large.

[Brief explanation of drawings]

Figure 1 shows the insulation groove (TI margin) in the metallized film.
FIGS. 2 and 3 are plan views of essential parts of a conventional metallized film capacitor with a self-safety function, and FIG. 4 is a plan view of essential parts of an embodiment of the metallized film capacitor of the present invention. FIG. 2 is an enlarged plan view of essential parts of a metallized film capacitor according to an embodiment of the present invention. 1: Metallized film 2: Insulating margin 3: Insulating groove 4: Fusing slot Patent applicant [] Hon Capacitor Industry Co., Ltd. Figure 1 Figure 3 Figure 2 Figure ↓ B

Claims (4)

[Claims] (1) A metallized film is provided with an insulating margin at the end in the width direction on at least one side of the dielectric film, and an insulating groove that divides the deposited electrode into a plurality of pieces in the length direction. A metallized film in which a using slot is formed is constructed, the metallized films are stacked on at least one side with the insulation margins on opposite sides, and wound around each other, and a metal such as solder or zinc is sprayed on both ends of the metallized film. A metallized film capacitor characterized by forming an electrode lead-out portion. (2) The metallized film capacitor according to claim 1, wherein an insulating groove is formed leaving a part of the vapor-deposited electrode on the electrode extraction side. (3) Claim 1, characterized in that the spacing between the fusing slots is 5 mm or less, and the total spacing of the fusing slots existing between the insulating grooves is 25 wn or less. Or the metallized film capacitor according to item 2. (4) The deposited metal is made of zinc, and the film resistance is 6 to 1.
A metallized film capacitor according to claim 1 or 2 or 3, which has a resistance of 5 Ω/port.