JPS61207009A - Manufacture of capacitor for high pressure - 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 (Field of Industrial Application) The present invention relates to a method for manufacturing a film-wound high-voltage capacitor.

(Prior Art) The present applicant previously developed a capacitor of this type by using a pair of dielectric films in which a plurality of electrodes are disposed at predetermined intervals, with some of the electrodes facing each other, and to 2
We proposed a method in which two dielectric films are placed one on top of the other, one dielectric film is placed on top and one on top of the other, and the rolled body is impregnated with an impregnating agent.

(Problems to be Solved by the Invention) High-voltage film capacitors are generally constructed by connecting multiple capacitors in series, and structurally, some do not use an impregnating agent, while others use an impregnating agent. There are some methods that take advantage of this effect.

In order to maintain good weather resistance characteristics (e.g. lifespan, heat shock, charge/discharge cycle tests) of capacitors, it is important to sufficiently impregnate the capacitor with an impregnating agent. Although it is natural that the amount of impregnation is affected, there are limits to these factors alone, and it is unreasonable to expect a higher degree of impregnation. Extending this further, the space layer to be impregnated in a film capacitor is extremely narrow, on the order of several microns to less than that, although there are differences in size depending on the shape of the element (cylindrical, flat, etc.). A solid impregnating agent such as EBO 1-C resin is used as the impregnating agent, but since the vacuum impregnation method is used, the viscosity that affects the degree of impregnation is limited to about IGOCI)S even if efforts are made to lower the viscosity. .

Regarding vacuum impregnation conditions, if the degree of vacuum is increased, the impregnating agent composition may evaporate and the content composition may be destroyed.
Also, in terms of vacuum equipment, if evaporated matter is inhaled, a problem arises in that the equipment breaks down.

Therefore, in order to achieve sufficient impregnation under such conditions, it is necessary to devise measures for the capacitor element, which is the object to be impregnated. Generally, in such cases, an easily impregnable film (
Methods such as using a film with a roughened surface have been taken, but although the effect is very large when using a liquid impregnant, solid impregnants are still insufficient.

The high-voltage capacitor proposed earlier by the present applicant is excellent for high-voltage use, but because the impregnation is not sufficient,
It was still not sufficient in terms of weather resistance.

An object of the present invention is to provide a manufacturing method that can significantly improve the weather resistance properties of such high-pressure condensate υ.

(Means for Solving the Problems) The first invention of the present application is to connect a pair of first dielectric films in which a plurality of electrodes are arranged at predetermined intervals, with a second dielectric film interposed between the electrodes. In the manufacturing method of a series capacitor, which is formed by overlapping and winding the parts so that the parts face each other,
Of the two second dielectric films, the second dielectric film in contact with the non-electrode surface of the first dielectric film is a dielectric film having a fusing material layer adhered to at least one surface thereof;
After winding the first and second dielectric films 18, the first and second dielectric films 18 are heat-treated to fuse the fusing material layer of the second dielectric film to at least the electrode-arranged surface of the first dielectric film. The gap formed by the second dielectric film is impregnated with a liquefied solid impregnating agent. In a series capacitor formed by overlapping and winding two electrodes with two dielectric films interposed so that a portion of each electrode faces each other, one second dielectric film has a layer of fusion material coated on one side. The first and second dielectric films are wound and then heat treated to fuse the adhesive layer of the second dielectric film to the electrode-arranged surface of the first dielectric film. The first and second wound
It is characterized by impregnating the gap formed by the dielectric film with a liquefied solid impregnating agent.

(Example) FIG. 1 shows a developed side view of the dielectric and electrodes of a high-voltage condenser produced according to an example of the first invention of the present application.

In the figure, (1A) is a first YG electric film in which a plurality of (for example, three) electrodes (2) are arranged at predetermined intervals by vacuum-depositing metal, and (1B) is a similar film. The starting and ending electrodes (28) (2B )
is a first dielectric film arranged at a predetermined distance from the electrode (2), (4A) is a second dielectric film on which no electrode is formed, and (4B) is a first dielectric film (I
A) A fusion material layer (5) is adhered by coating or bonding to the surface of (IB) on the electrode arrangement side and in contact with the first dielectric film (1^) (IB) during winding. This is the second dielectric film.

As shown in the figure, the second dielectric film (4^), the first dielectric film (1B), the second dielectric film (4B), the second
Dielectric film (4^), first dielectric film (1A)
and the second dielectric film (4B) in this order and the first dielectric film (4B).
Each electrode (h) of the electric body (1^) (1B) is overlapped and wound so that a part thereof faces each other, and then the wound body is heated at a temperature higher than the fusing temperature of the fusing material layer (5). Heat treatment such as thermocompression bonding and heat aging is performed at high temperature, and then vacuum impregnation is performed with a solid impregnating agent made of liquefied synthetic resin.

Thus, through the heat treatment, the second dielectric film (4B) adheres to the first iBt-based film (IA) (1B), and the second dielectric film (4A) and the first dielectric film (1^
) and (1B) and the second dielectric film (4
The gap between B) and the second dielectric film (4^) becomes wider, and the impregnating agent is more fully impregnated into the gap than before.

Figures 2 to 4 show various characteristics (capacitance change rate during the work process, DC breakdown voltage after human shock test, Durability of charge/discharge test 1-) is shown.

The tested capacitors manufactured according to the present invention (10 for each test) used the following dielectric film, etc.

An aluminum-deposited polyester film with a thickness of 6u is used as the first dielectric film (18) (IB), and the starting and ending electrodes (2A) are arranged on the film (1B).
As (2B), 5 pairs of aluminum foils with a thickness of 5 pairs were used, and as lead wires (3) to be welded to the aluminum foils, wires with a diameter of 0.5 mm were used. Also, the thickness of the second dielectric film (4A) is 6J.
A polyester film was used as the second dielectric film (4B), and a solvent-based adhesive containing saturated polyester resin as a main component and cross-linked with polyfunctional isocyanate was applied to the second side of the film or bonded as a sheet. The thickness of the adhesive layer (5) applied as shown is 12
A LL film was used.

After winding the dielectric film, the adhesive has a thermal bonding temperature of about 8
Heat treatment was performed at 120°C, which is higher than 0°C, for 5 to 60 minutes to impregnate an epoxy resin as an impregnating agent.

In addition, the lead wire (3) should be placed at a distance of about 10# from the edge of the part facing the electrode (2). (2A) Welded on (2B).

Although the drawing shows six capacitors in series, there were twelve in series, and the capacitance was 1500PF.

As a comparative example, ten capacitors were used for each test, except that a polyester film with a thickness of 1i was used instead of the second dielectric film on which the adhesive layer (5) was applied. Created.

Capacitor A (solid line) manufactured according to the present invention has a stable and high capacitance change rate during the work process as shown in the second figure, and is less susceptible to heat shock as shown in the third figure, compared to comparative example B (broken line). The DC breakdown voltage after testing (-30°C for 1 hour, +110°C for 1 hour as one cycle) was stable without deterioration, and as shown in Figure 4, the DC breakdown voltage was tested (Charging at 30KV DC for 1 second). The durability (one cycle is defined as discharging for 1 second after 2 seconds and stopping for 2 seconds) was also significantly improved.

In addition, in the above embodiment, - of the second dielectric film (4B)
i! coated on the surface! The adhesion layer 5) was fused to the electrode-arranged surfaces of the second dielectric films (1A) and (1B), but the second dielectric film with the fusion material layer (5) adhered to both sides was The fusing material layer (5) of this film may be FI&adhered to the electrode-arranged surfaces of the second dielectric film (4^) and the first dielectric films (1A) (1B).

FIG. 5 shows a developed side view of the dielectric and electrodes of a high-voltage capacitor manufactured according to an embodiment of the second invention of the present application.

In this embodiment, the fusing material layer (5) is attached to the negative side.
A first dielectric film (1A) and a first dielectric film (1B) each having a plurality of electrodes arranged at predetermined intervals are made of two second dielectric films (4B).
) and the film (1Δ) (IB
) are wound with the first and second dielectric films (IA) (1B) and (4B) (4B) facing each other, and then the welding material layer (5) is fused onto this wound body. Heat treatment is performed at a temperature higher than the fusion temperature of the bonding material, and further vacuum impregnation is performed with a synthetic resin impregnating agent.

Thus, by the heat treatment, the second dielectric film (4B) and the first dielectric films (1A) and (1B) are bonded,
The gap between the electrode-free surface of the first dielectric film (1A) and the second dielectric film (4B) and the first dielectric film (
Since the gaps between the non-electrode surface of 1B) and the second dielectric film (4B) are widened, the impregnating agent is more fully impregnated into the gaps than before.

(Effects of the Invention) The first invention of the present application provides a second dielectric film that is in contact with the electrode-arranged surface of the first dielectric film and is coated with a fusing material layer on at least one surface of the two second dielectric films. Using the attached dielectric film, heat treatment is performed after winding the first and second dielectric films to fuse the fusing material layer of the second dielectric film to at least the electrode-arranged surface of the first dielectric film. let me,
The gap formed by the wound first and second dielectric films is impregnated with a liquefied solid impregnating agent,
The invention is a dielectric film in which a melting material layer is adhered to one side of a second dielectric film, and the second dielectric film is heat-treated after winding the first and second dielectric films. The welding material layer was fused to the electrode-arranged surface of the first dielectric film, and the gap formed by the wound first and second dielectric films was impregnated with the liquefied solid impregnating agent. 1
The impregnating agent is sufficiently impregnated into the wide gap formed between the non-electrode surface of the dielectric film and the second dielectric film, or between this gap and the second dielectric film, and then This has the effect of providing a high-voltage capacitor with significantly improved weather resistance and withstand voltage characteristics compared to conventional capacitors.

[Brief explanation of the drawing]

FIG. 1 is a developed side view of the dielectric and electrodes of a high-voltage capacitor manufactured according to an embodiment of the first invention of the present application;
Figures 2 to 4 are characteristic diagrams of the high-voltage capacitor and a comparative example capacitor, and Figure 5 is a side view showing the dielectric and electrodes of the high-voltage capacitor manufactured according to an embodiment of the second invention of the present application. Show the diagram. (1^) (IB)...First dielectric film (2) (2
8) (2B)... Electrode (3)... Lead wire (4A) (4B)... Second dielectric film (5)...
・Fusion material layer patent filed by Taiyo Tsushin Kogyo Co., Ltd. and two others - Tora Masai Figure 1 Figure 2! ! I #I ; 3 figures 111 cry heat in the fog, 1 Tsuku's Wyke IL, Maki 5th figure

Claims (1)

[Claims] 1. A pair of first dielectric films in which a plurality of electrodes are arranged at predetermined intervals are overlapped with a second dielectric film interposed so that a portion of each electrode faces each other. In the method for manufacturing a series capacitor, the second dielectric film, which contacts the electrode-arranged surface of the first dielectric film, has a fusing material layer on at least one surface of the two second dielectric films. A deposited dielectric film, which is heat-treated after winding the first and second dielectric films to fuse the fusing material layer of the second dielectric film to at least the electrode-arranged surface of the first dielectric film. A method for manufacturing a high-voltage capacitor, which comprises impregnating a liquefied solid impregnating agent into the gap formed by the first and second dielectric films that are applied and wound. 2. A series film formed by winding a pair of first dielectric films in which a plurality of electrodes are arranged at predetermined intervals, overlapping each other with a second dielectric film interposed so that a portion of each electrode faces each other. In this type of capacitor, one second dielectric film is a dielectric film having a fusion material layer adhered on one side, and after winding the first and second dielectric films, heat treatment is performed to form the second dielectric film. fusing the fusing material layer of the body film to the electrode arrangement surface of the first dielectric film, and impregnating the gap formed by the wound first and second dielectric films with a liquefied solid impregnating agent. A method for manufacturing a high voltage capacitor, characterized by: