JPS58103113A - 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 is a capacitor in which an electrode is taken out by metallization (metal spraying) treatment, that is, a vapor-deposited film (deposited electrode) is coated with metallicon in order to limit current. This invention relates to a capacitor that has a self-safety feature by providing a blank part (removed part).

Conventionally, as shown in Fig. 1, metal is vapor-deposited on a dielectric sheet 1 such as a plastic film or insulating paper, and the metal is used as a vapor-deposited electrode 2.The shape of the capacitor is approximately as shown in Fig. 2. , electrodes are taken out from both sides by metallicon treatment. However, when this Yotsukata capacitor was used at high temperatures or high voltages, the dielectric sheet suffered dielectric breakdown, which could cause the capacitor to break down or catch fire. In the figure, 3 is the margin part, 4 is the sprayed metal part (metallicon part), 5 is the lead, w! , mu is the metallic spray direction.

The purpose of the present invention is to prevent the capacitor from being destroyed in this way.
To provide a capacitor that does not emit smoke or catch fire. The same purpose can be achieved by creating a notch in the vapor deposited film or by providing a circular or square vapor deposited film blank part 6 with a diameter of approximately 1 m1 as shown in Fig. 3 along the edge of the vapor deposited film on the side to be treated with metallicon. However, according to research conducted by the present inventors, it is not possible to realize a capacitor with a self-safety function by simply providing these features, and as shown in the present invention, It was found that a capacitor with a self-safety function could be realized for the first time by having a blank part of the deposited film with a special size or spacing in that part.

The principle of the self-safety function according to the present invention is as shown in Fig. 4. If a part of the dielectric sheet breaks down, as shown in Fig. 4 (a), a current will flow from the ζ metallicon part. is supplied, a current flows between the blank parts 6 and 60 of the vapor deposited film 2 as shown by the arrow, and the current flows through the broken part 7 to the other electrode. In this case, as shown in FIG. 4(b), if a current exceeding that which the vapor deposited film between the blank parts 6 can tolerate flows, this vapor deposited film acts as a fuse and becomes disconnected. 8 is a disconnection part), which cuts off the supply of current from the metallicon side, thereby preventing the expansion of the destroyed part. This is the main principle of the self-security function in the present invention, but unless the size of the blank part 6 and the distance between the blank parts 6 and the other blank parts 6 are not sufficiently considered, the self-security function will not work. , or a capacitor with a slightly lower capacitance or a capacitor with a larger tan δ, so it is necessary to consider this carefully.

As shown in FIG. 6, blank portions 6 of the vapor deposited film of various sizes and shapes are provided along the edge of the film on the side of the vapor deposited film 2 to be subjected to the metallicon treatment. here.

The length of the electrode 2 is L, and the shortest distance between adjacent blank parts 6 is a1, a2. a,..., is named 輻.

Next, the current pass rate P is defined by the following equation.

According to the results of detailed study by the present inventors, 1≦P≦40
It has been found that by doing so, a self-safety function works, and a capacitor with reduced capacitance and small tan δ can be realized.

Next, a concrete explanation will be given using examples.

Example 1 Polyethylene terephthalate (hereinafter referred to as PET) with a thickness of 6 μl
) The vapor deposited film 2 on one side of the film is provided with a uniform rectangular vapor deposited film blank part 6 as shown in FIG.
A polypropylene (hereinafter abbreviated as PP) film with a thickness of 6 μm is used as a laminating film on the double-sided vapor-deposited PET film (see Figure 7), which is layered and wound, and then treated with metallicon to form a capacitor. I got it.

At this time, each dimension is as shown in samples 11 & 11 in Table 1 below. The obtained capacitor was packaged with epoxy resin, and the capacitance and tan δ were confirmed. Sample No. 1 in Table 1 was found.
As shown in the figure, it shows excellent characteristics, and even if the capacitor is destroyed by applying 400V in an atmosphere of 80℃,
No ignition, smoke, or cracking was observed, and it was confirmed that the product had a sufficient self-protection function. In addition, the vapor-deposited film resistance of the vapor-deposited film used here was 2.6 to 4.
,0Ω/sq.

There was r.

Table 1 ○...Ignition 6 Smoke, no cracks X...
- Ignition 1 Smoke, Crank Foot Example 2 Using the same dielectric structure as in Example 1, the results of evaluation with various current pass rates P are shown in sample floor 2 to sample floor 8. In all cases, excellent results were obtained in terms of capacity, tan δ, and self-protection characteristics. When we created specimens 9 and 11kL1o, which had a similar dielectric structure and had extremely heavy current pass rates, they found that although the self-safety function was extremely excellent,
It was found that tan δ was about one order of magnitude larger, making it unsuitable as a capacitor.

Another sample? &1.11 and sample Nl112,
It was found that the self-protection function did not work with current pass rates of 71% and 60%. The resistance of the deposited film is 2.6 to 4. #Ω/sq ◎Example 3 A uniform rectangular vapor-deposited film blank area 6 as shown in FIG. A divided vapor deposition electrode 2' is constructed by providing vapor deposited film removal portions or lines 9 at different intervals in the longitudinal direction. A PP film with a thickness of 6 μm is used as a matching film for a double-sided vapor-deposited PET film that has no blank areas but a margin area, which is used in the conventional film, and is rolled and treated with metallicon. I got a capacitor. Each dimension and value at this time is shown in Table 2 below.
It is as shown in 1113. The resulting capacitor was packaged with epoxy resin, and the capacitance and tan δ were checked.
As shown in sample N1113 in Table 2, it showed excellent characteristics, and even when the capacitor was destroyed by applying 400V in an ambient atmosphere of 70°C, no ignition, smoke, or cracking was observed. , it was confirmed that it has sufficient self-security function. The vapor deposited film resistance used here was 3.
It was 2'-3,80/gq.

Margin below: Table 2: 0 ignition, 0 smoke, 2 no fire x 2
・・No ignition, no smoke, 2 tsukuashi Example 4 Capacitors were made with the same dielectric structure as in Example 3, but with various current pass rates P and division intervals q of the divided evaporation electrodes.
The evaluated results are shown in samples N1114 to N119. In all cases, excellent results were obtained in terms of capacity, tan δ, and self-protection function. When we created sample floor 20 and sample floor 21 with the same dielectric composition and extremely low current pass rates, we found that although the self-protection function was extremely excellent, the tan δ was about one order of magnitude larger, making them unsuitable as capacitors. .

On the other hand, sample N122, sample Na23, and sample ll&1
The current pass rate P of No. 24 was 6796, 71%, and 60%, but the self-protection function did not work in any of these samples. In addition, the vapor-deposited film resistance of the vapor-deposited film used here was 3.2-3.80/gq.

In the above example, an example was shown in which a PP laminated film was used as a double-sided vapor deposited film of a PET film.
The same effect can be obtained with a capacitor using a PET film deposited on one side and a PP film deposited on one side, or with a capacitor using only a PET film or a capacitor using only a PP film.

Furthermore, although the above embodiments show an example of a wound type capacitor, it goes without saying that the same effect can be obtained with a so-called multilayer type capacitor.

Furthermore, in each of the above embodiments, a vapor deposited film blank part is provided on only one side, and the other side has a structure of a vapor deposited electrode without a vapor deposited film blank part, which is conventionally used. Of course, the same effect can be obtained even if similar vapor-deposited film blank areas are provided on both sides. Furthermore, although the above example shows an example in which a uniform rectangular vapor deposited film blank area is provided, this does not necessarily have to be uniform, and as shown in FIG. The same effect can also be obtained by providing a section.

As described above, according to the present invention, it is possible to provide a safe capacitor with a self-protection function, and its industrial efficiency is great.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional metallized film, Figure 2 is a perspective view of a general capacitor, Figure 3 is an in-plane view of a metallized film that has already been proposed, Figure 4 (A) and (B) are metal FIG. 6 is a plan view of a metallized film used in the capacitor of the present invention; FIG. 6 is a plan view of another example; FIG. 7 is a sectional view taken along line B-B' in FIG. 6, and FIG. 8 is a plan view of still another example of the metallized film used in the capacitor of the present invention. 1... Dielectric sheet (plastic film,
(insulating paper, etc.), 2... Deposited electrode (deposited film), 2'
......Divided vapor deposition electrode, 3...Margin part, 4...Sprayed metal part (metallicon part), 6...
...Lead wire, 6...Vapour-deposited electrode blank area (vapor-deposited film blank area), 7...Destroyed part, 8...
- Disconnection section, 9... evaporation electrode removal section or line. Name of agent: Patent attorney Toshio Nakao and 1 other group
1ff1 1I z Figure 3 Figure 114 Figure 5 concavity 62 Figure 6

Claims (3)

[Claims] (1) At least one of the two opposing evaporation electrodes formed on the dielectric sheet has a evaporation electrode blank part intermittently along the end of the evaporation electrode where the sprayed metal is applied. , and a current pass rate in the longitudinal direction of the vapor deposition electrode in the vapor deposition electrode blank portion is 1 to 40%. (2) According to claim (1), the evaporation electrode has a vacuum evaporation electrode intermittently along the end of the electrode on which the thermal sprayed metal is applied, and the evaporation electrode is constituted by a single-segment evaporation electrode. capacitor. (3) The capacitor according to claim (1) or (2), wherein the vapor deposition electrode blank portion of the vapor deposition electrode is located at a position overlapping the margin portion on the opposing electrode side.