JPS5866318A - 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 a metallized film capacitor that is provided with a safety function by devising a vapor-deposited electrode of the metallized film.

Currently, metallized film capacitors are used as extremely high-quality capacitors due to the self-healing properties unique to the metallized layer, but there are limits to the self-healing properties and capacitors may suddenly break or break at corners. Concerns remain over the occurrence of accidents such as fever (9 cases) and smoke (9 cases) and fires (9 cases). In fact, there are some capacitors that undergo incomplete self-recovery and smoke and catch fire if a voltage double the rated voltage is applied.

On the other hand, some capacitors have built-in safety devices to compensate for these unsafe points.

In view of the above-mentioned drawbacks of metallized film capacitors, the present invention provides a capacitor that has a safety function that prevents accidents such as smoke and ignition even when a high voltage is applied that is in an incomplete self-recovery region without incorporating a safety device. This is what we provide.

If referring to a conventional metallized film capacitor, it is shown in FIG. On the other hand, the metallized film capacitor of the present invention is shown in FIG. The metal parts 6 are arranged in a dotted line pattern, and the specifications of each part of the metal electrode are shown in FIG. 3, which is a plan view of a single-sided metallized film. The distance of the metal layer between the individual non-metallic parts S2 is set to 6. The division width that is divided into dotted lines by the series of dotted lines of s is defined as L.

Although the present invention is shown in FIG. 2 as a wound capacitor,
The case of a multilayer capacitor as shown in FIG. 4 is exactly the same, and has a structure in which small non-metal parts 6 are connected in a dotted line shape and the metal electrode is divided.

The present invention will be explained below based on examples.

Example 1 In a capacitor in which a double-sided metallized polyethylene terephthalate film with a thickness of 6 μm and a polypropylene film with a thickness of 5 μm are wound in layers, L=1o, omm, l= 1
．． A dotted parting line made of a non-metallic part is formed on the metal layer surface of Table 11E of the double-sided metalized polyethylene terephthalate film [m], and the area of S of the dotted parting line is 0.0mm.
1mm2 and 0.5mm2 were prototyped and examined.

Figure 5 shows the capacity reduction characteristics during these life tests.

The vertical axis shows the capacitance change rate in percentage (%), where C is the capacitance value before voltage application. The horizontal axis indicates voltage application time. The life test voltage is the result of applying a voltage 1.3 times the rated voltage. In the figure, 7I/-1: without dotted dividing line, 8 is S == 0.1 mm, 2.9 is S = 0.
5 m12.10714 S = 1, Omm2.1
This is the case when 1td S ==2, omm.

From this result, it can be seen that when the area of S becomes large, the capacitance decrease in the life test becomes large and the quality of the capacitor deteriorates, but if S is less than 0, s mm2.

It can be seen that the quality is almost the same as that of conventional capacitors.

On the other hand, the safety test is JIS-04908
It is standardized for capacitors with safety capacitors.

The test was carried out under the conditions of a capacitor safety test, and the conventional capacitor used for comparison (without dotted dividing lines) produced smoke and 1 ignition, but the above prototype capacitors with dotted dividing lines all emitted smoke and did not cause 9 ignitions. The capacitance was zero, that is, the current passed was zero.

Next, with the same film configuration, S = 0.5 mm2.

A dotted dividing line is provided on both sides at L = 10.0771 m, and 1
-=0.5mm, l==:1. Omm, l=2.0
mm.

1==3.0mm, l=s, omm (7) Regarding 5 types.

A prototype capacitor was manufactured, and a safety test specified in the JIS-c4eoa was conducted. The results are shown in Table 1 below.

Table 1 Safety test) (d) Tests are conducted on 6 pieces each, and if the JIS is satisfied, ○9 If smoke or ignition occurs, it is indicated by ×.From this result, if l = 1.0 mm or less, It can be seen that a capacitor with high safety can be obtained only by using this method.

Next, with the same film configuration, s=o, 5mm2゜1=1,
Create a dotted dividing line on both sides using owm.

x,=e,omm,L=s,om*',L=1 o,
omm.

L==12,0m771. L=14.0 mm (06 types) A prototype capacitor was manufactured and tested for safety according to JIS-c4eos.The results are shown in Table 2 below.

Table 2 From this result, L: 10. It can be seen that the most secure capacitor can be obtained when the thickness is 0 mm or less.

A metallized film capacitor having a structure of 1.0 mm or less, with a dotted dividing line having a dividing width of preferably 10 mm or less, which has the same quality and characteristics as a conventional capacitor without a dotted dividing line, and has a safety device. without adding
It is understood that the capacitor has safety properties.

Example 2 In a capacitor in which a double-sided metallized polyethylene terephthalate film with a thickness of 6 μm and a polypropylene film with a thickness of 5 μm are wound in layers, L=1o, omm, 6=1.
6 mm, dotted on only one side of a double-sided metallized polyethylene terephthalate film. In the figure, 12 has no dotted dividing line, 139 S = 0.1 mm", 14LfiS
=0.57717W", 161dS-1.0mm2
．． 1e ld S = 2. In case of omm2, there is a tear.

So, l ==0.5 mm, 1, OrrLm,
2.0mm, 3.0mm.

OJ l5-C4908 (7) Safety test results for each case of s and omm, Table 4 shows that s ==0.5 mm
2.

l/=,1. omm, b=e, omm, s, omm
.

These are the safety test results for each case of 10.0 mm, 12.0 mm, and 14.0 mm.

I can say things.

Example 3 A capacitor was manufactured by winding two single-sided metallized polypropylene films of 6 μm in diameter, each of which had metal electrodes on one side formed by zinc evaporation (L: 10.0 mm).

6=1. In the figure, 17 indicates no dotted dividing line, 1s i 13-o, 1m.
m2゜19fdS==0.577'Lm2.20idS
=1.0m77L2.21 is S ==2.0 mm2
The case is shown below.

The following table -5ff;-, S = 0.5 m77L2. L
= 10.0mm and when l is changed, Table-614,
S = 0.6 mm2゜l = 1.0 mm When Te and L are changed (7) This is the safety test result of J Engineering S-04908.

The results of Example 3 shown in Table 6 below are also similar to the results of Example 1.

As is clear from the above examples, the present invention provides s;+
% 0.5 mm2 or less 17% 1. The metallized film 11 has a structure in which the vapor-deposited electrode of the metallized film is divided by dotted dividing lines that are continuous at intervals of 0 mm or less,
・-2. Smoke generation when high voltage is applied in the incomplete self-recovery region without deteriorating the high quality characteristics unique to Ilumu capacitors.

This makes it possible to provide an extremely safe capacitor that does not cause ignition.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional wound type metallized film capacitor when it is wound; FIG. 2 is a perspective view of a wound type metallized film capacitor according to an embodiment of the present invention when it is wound; 3
The figure is a plan view of the metallized film in the same capacitor, FIG. 4 is a perspective view of a laminated metallized film capacitor according to another embodiment of the present invention, and FIGS. 5, 6, and 7 are voltage application. FIG. 3 is a characteristic diagram of capacity change rate with respect to time. 3.4...Metalized film, 6,6...
- Non-gold part (dotted dividing line). Name of agent: Patent attorney Ken Nakao and 1 other person 1st
Fig. 4 Fig. 5 tl Sent rf #71D1157%1 (sr>□ Fig. 6 1n pressure fp 7Jn n her) □ 7th vA +1 pressure tpsH + open (Hr) □

Claims (2)

[Claims] (1) Intermittent non-metallic parts each having an area of 0.54 m2 or less 1. 1. A metallized film capacitor, characterized in that it is constructed using a metallized film in which vapor-deposited electrodes are divided by dotted dividing lines arranged at intervals of 0.0 mm or less. (2) The metallized film capacitor according to claim (1), wherein the dividing width of the dotted dividing line is 10.0771 m or less.