JPH0572734B2 - - Google Patents

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 arranged at predetermined intervals, with some of the electrodes facing each other, and We have 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 wound body is impregnated with an impregnating agent.

(Problems to be solved by the invention) High-voltage film capacitors are generally composed of multiple capacitors connected in series.
In terms of structure, there are those that do not use an impregnating agent and those that use an impregnating agent to greatly enhance its effects.

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 water is influenced by these factors, 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 the film capacitor is
Although there are differences in size depending on the shape of the element (cylindrical, flat, etc.), it is extremely narrow, ranging from the order of several μm to less than that. A solid impregnating agent such as epoxy resin is used as the impregnating agent, but since the vacuum impregnation method is used, the viscosity, which affects the degree of impregnation, cannot be reduced even if efforts are made to reduce the viscosity.
The limit is about 100cps.

As for the vacuum impregnation conditions, if the degree of vacuum is increased, there is a risk that the composition of the impregnating agent will evaporate and the content composition will be destroyed, and if the evaporated components are inhaled, there will be a problem that the device will malfunction. Therefore, in order to achieve sufficient impregnation under these conditions,
It is necessary to consider the capacitor element, which is the object to be impregnated. Generally, in such cases, the method of using an easily impregnated film (a film with a roughened surface) is taken, but although it is very effective when using a liquid impregnant, solid Impregnating agents are still insufficient.

The high-voltage capacitor previously proposed by the present applicant is excellent for high-voltage use, but because impregnation is not sufficiently carried out, the capacitor is still unsatisfactory in terms of weather resistance.

An object of the present invention is to provide a manufacturing method that can significantly improve the weather resistance characteristics of such high-voltage capacitors.

(Means for Solving the Problems) The first invention of the present application includes a first dielectric film and a second dielectric film each having a plurality of electrodes arranged at predetermined intervals on one side. The first dielectric film, the two second dielectric films, the first dielectric film, and the second dielectric film are stacked in this order so that a portion of each electrode of the pair of first dielectric films faces each other. In the manufacturing method of a series capacitor, the first dielectric film of two second dielectric films interposed between a pair of first dielectric films is The second dielectric film in contact with the non-electrode surface of the body film is a dielectric film coated with a fusion material layer on at least one surface, and is heat-treated after winding the first and second dielectric films. The fusion material layer of the second dielectric film is fused to at least the electrode-arranged surface of the first dielectric film, and a liquefied solid is placed in the gap formed by the wound first and second dielectric films. The second invention is characterized in that it is impregnated with an impregnating material, and the second invention includes a first dielectric film and a second dielectric film in which a plurality of electrodes are arranged at predetermined intervals, a first dielectric film, a second dielectric film, A pair of first dielectric films are stacked in the order of the first dielectric film and the second dielectric film so that a part of each electrode faces each other, and then wound, and the wound body is impregnated with an impregnating agent. In the method for manufacturing a series capacitor, a second dielectric film interposed between a pair of first dielectric films is a dielectric film having a fusion material layer coated on one surface; After winding the second dielectric film, heat treatment is performed to fuse the fusing material layer of the second dielectric film to the electrode-arranged surface of the first dielectric film, and then the wound first and second dielectric films are heated. It is characterized by impregnating the gap formed by the body film with a liquefied solid impregnating agent.

(Embodiment) FIG. 1 shows 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.

In the figure, 1A is a first dielectric film in which a plurality of (e.g., three) electrodes 2 are arranged at predetermined intervals by vacuum-depositing a metal, and 1B is a first dielectric film in which a plurality of (e.g., three) electrodes 2 are formed by a similar method. 2 electrodes 2
are arranged at predetermined intervals, and the lead wires 3
A first dielectric film has starting and ending electrodes 2A and 2B made of metal foil fused to each other and is spaced apart from the electrode 2 by a predetermined distance, and 4A is a second dielectric film on which no electrodes are formed. , 4B are in contact with the electrode arrangement side surfaces of the first dielectric films 1A, 1B, and a fusion material layer 5 is applied by coating or bonding to the surfaces in contact with the first dielectric films 1A, 1B during winding. This is a second dielectric film.

As shown in the figure, a second dielectric film 4A, a first dielectric film 1B, a second dielectric film 4B, a second dielectric film 4A, a first dielectric film 1A
and the second dielectric film 4B are stacked in this order so that the electrodes 2 of the first dielectrics 1A and 1B partially face each other, and then wound. Next, this wound body is coated with a fusing material layer 5. Heat treatment such as thermocompression bonding and heat aging is performed at a temperature higher than the fusion temperature of the material, and the material is further vacuum impregnated with a solid impregnating agent of liquefied synthetic resin.

Thus, the second dielectric film 4 is formed by the heat treatment.
B is bonded to the first dielectric films 1A and 1B, and the second dielectric film 4A and the first dielectric film 1A are bonded to each other.
and the gap between the second dielectric film 4B and the second dielectric film 4B.
The gap between the second dielectric film 4A and the second dielectric film 4A is widened, 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 hit shock test, (durability of charge/discharge test).

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

The thickness of the first dielectric films 1A and 1B is 6 μm.
Using an aluminum vapor-deposited polyester film, an aluminum foil with a thickness of 5 μm is used as the starting and ending electrodes 2A and 2B disposed on the film 1B.
As lead wires 3 to be welded thereto, wires each having a diameter of 0.5 mm were used. In addition, a polyester film with a thickness of 6μ is used as the second dielectric film 4A, a polyester film is used as the second dielectric film 4B, and a solvent-based adhesive containing saturated polyester resin as the main component and cross-linked with polyfunctional isocyanate is applied to one side of the film. A film with a thickness of 12 μm was used, on which a fusing material layer 5, which was coated or bonded as a sheet, was attached as shown in the figure.

After winding the dielectric film, it was heat-treated for 5 to 60 minutes at 120°C, which is higher than the thermal adhesion temperature of the adhesive, about 80°C, to impregnate it with an epoxy resin as an impregnating agent.

The lead wires 3 were welded onto the electrodes 2A and 2B at a distance of approximately 10 mm from the edge of the portion facing the electrode 2.

This capacitor shows 6 in series in the drawing, but it has 12 in series, and its capacitance is
It was 1200PF.

As a comparative example, 10 capacitors were fabricated for each test, except that a 12 μm thick polyester film was used instead of the second dielectric film on which the adhesive layer 5 was applied. .

Capacitor A made according to the present invention (solid line)
Compared to Comparative Example B (broken line), as shown in the second diagram, the capacitance after impregnation with the impregnating material increases significantly compared to before impregnation. Compared to Comparative Example B, Capacitor A manufactured according to the present invention has a plurality of electrodes arranged at predetermined intervals on one side between the other side of the first dielectric film and the second dielectric film. and a second dielectric film having a fusion material layer adhered to one side thereof.
This is due to the fact that the impregnating material was more thoroughly impregnated with the other side of the dielectric film than in Comparative Example B. Capacitor A manufactured according to the present invention was subjected to a heat shock test (-30°C for 1 hour, +
The DC breakdown voltage after one cycle of 1 hour at 110°C was stable without any deterioration, and the charge/discharge test was performed as shown in Figure 4 (charged at 30KV DC for 1 second, then left for 1 second after 2 seconds). The durability (one cycle is defined as a 2-second stop) was also significantly improved.

In addition, in the embodiment, the second dielectric film 4B
The fusing material layer 5 deposited on one surface was fused to the electrode-arranged surfaces of the second dielectric films 1A and 1B, but the second dielectric film having the fusing material layer 5 deposited on both surfaces was fused. The fusing material 5 of this film may be fused to the second dielectric film 4A and the electrode-arranged surfaces of the first dielectric films 1A and 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, one second dielectric film 4B having a fusion material layer 5 attached thereto is placed between first dielectric films 1A and 1B having a plurality of electrodes arranged at predetermined intervals. The adhesive layer 5 is attached to the films 1A and 1B.
The first and second dielectric films 1A, 1B and 4B, 4B are wound around each other so as to face each other, and then the wound body is heated at a temperature higher than the fusing temperature of the fusing material of the fusing material layer 5. Heat treatment is performed, and then vacuum impregnation is performed with a synthetic resin impregnating agent.

Thus, the second dielectric film 4 is formed by the heat treatment.
B and the first dielectric films 1A and 1B are adhered, and the gap between the electrode-free surface of the first dielectric film 1A and the second euelectric film 4B and the electrode-free surface of the first dielectric film 1B are Since the gaps between the surface and the second dielectric film 4B are widened, the impregnating agent is more fully impregnated into the gaps than in the past.

(Effects of the Invention) In the first invention of the present application, at least one surface of the second dielectric film that contacts the electrode arrangement surface of the first dielectric film among the two second dielectric films is coated with a fusion material layer. Using the deposited dielectric film, the first
and after winding the second dielectric film, the second dielectric film is heat-treated to form at least the first adhesive layer.
The second invention of the present application provides a single sheet in which a liquefied solid impregnating agent is impregnated into the gap formed by the first and second dielectric films that are fused to the electrode arrangement surface of the dielectric film and wound. The second dielectric film is a dielectric film having a fusion material layer coated on one side,
After winding the first and second dielectric films, heat treatment is performed to fuse the fusing material layer of the second dielectric film to the electrode-arranged surface of the first dielectric film, and the wound first and second dielectric films are Since the gap formed by the second dielectric film is impregnated with the liquefied solid impregnating agent, the wide gap formed between the non-electrode surface of the first dielectric film and the second dielectric film or between this gap and the 2
The impregnating agent sufficiently impregnates the wide gaps between the dielectric films, resulting in a high-voltage capacitor with significantly improved weather resistance and withstand voltage characteristics compared to those obtained by conventional methods.

[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, and FIGS. 2 to 4 show the high-voltage capacitor and capacitors of comparative examples. 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. 1A, 1B...first dielectric film, 2, 2
A, 2B... Electrode, 3... Lead wire, 4A, 4B
. . . second dielectric film, 5 . . . fusing material layer.

Claims (1)

[Claims] 1. A first dielectric film and a second dielectric film each having a plurality of electrodes arranged at predetermined intervals on one side,
The second dielectric film, the first dielectric film, the two second dielectric films, the first dielectric film, and the second dielectric film are arranged in this order, and a portion of each electrode of the pair of first dielectric films is In the manufacturing method of a series capacitor, the two second dielectric films are interposed between a pair of first dielectric films; Among the films, the second dielectric film that contacts the electrode wiring surface of the first dielectric film is a dielectric film having a fusion material layer adhered to at least one surface, and the winding of the first and second dielectric films Afterwards, heat treatment is performed to fuse the fusing material layer of the second dielectric film to at least the electrode disposed surface of the first dielectric film, and the first and second dielectric films are further wound. A method for manufacturing a high-voltage capacitor, which comprises impregnating a liquefied solid impregnating material in between. 2. A first dielectric film and a second dielectric film each having a plurality of electrodes arranged at predetermined intervals on one side,
first dielectric film, second dielectric film, first
A dielectric film and a second dielectric film are stacked in this order so that a portion of each electrode of a pair of first dielectric films faces each other, and then wound, and the wound body is impregnated with an impregnating material. In the method for manufacturing a series capacitor, a second dielectric film interposed between a pair of first dielectric films is a dielectric film having a fusion material layer coated on one surface;
After winding the second dielectric film, heat treatment is performed to fuse the fusing material layer of the second dielectric film to the electrode-arranged surface of the first dielectric film, and the wound first and second dielectric films are further wound. A method for manufacturing a high-voltage capacitor, which comprises impregnating a gap formed by a dielectric film with a liquefied solid impregnating agent.