JPH0562448B2 - - 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 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 an epoxy resin is used as the impregnating agent, but since the vacuum impregnation method is used, the viscosity, which affects the degree of impregnation, is limited to about 100 cps even if efforts are made to lower the viscosity.

Regarding 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, the problem of equipment failure will occur in the vacuum equipment. 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 (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, it 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 pair of first dielectric films each having a plurality of electrodes arranged at predetermined intervals on one side with two second dielectric films interposed therebetween. In a method for manufacturing a series capacitor, in which a part of each electrode is stacked so as to face each other, and a second dielectric film is stacked and wound on top and bottom of the top and bottom, respectively,
Of the four second dielectric films, the second dielectric film that contacts the non-electrode surface of the first dielectric film is fused to at least one surface opposite to the surface that contacts the first dielectric film. The dielectric film is a dielectric film on which a material layer is adhered, and after the first and second dielectric films are wound, the second dielectric film is heat-treated at a temperature higher than the fusing temperature of the fusing material layer to fuse the second dielectric film. The material layer is fused to at least another second dielectric film, and the gap formed by the wound first and second dielectric films is impregnated with a liquefied solid impregnating agent, In the invention, a pair of first dielectric films each having a plurality of electrodes arranged at predetermined intervals on one side are stacked with a second dielectric film interposed therebetween so that a portion of each electrode faces each other,
Furthermore, in a series type capacitor formed by overlapping and winding a second dielectric film on the side of the first dielectric film where a plurality of electrodes are exposed, the two second dielectric films are connected to the first dielectric film during the winding. The dielectric film is a dielectric film in which a fusing material layer is adhered to one surface that contacts the electrode-free surface of the body film, and after the first and second dielectric films are wound, the fusing temperature of the fusing material layer is lower than the fusing temperature of the fusing material layer. The first and second dielectric films are formed by heat-treating at a high temperature to fuse the fusing material layer of the second dielectric film to the non-electrode surface of the first dielectric film and winding the film. 〓It is characterized by impregnating a liquefied solid impregnating agent in between.

(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 in which starting and ending electrodes 2A and 2B made of metal foil welded are arranged at a predetermined distance from the electrode 2; 4A is a second dielectric film on which no electrodes are formed; A second film 4B is in contact with the surface of the first dielectric film 1A, 1B on the non-electrode side, and a fusion material layer 5 is applied to the surface facing the second dielectric film 4A during winding by coating or bonding. It is a dielectric film.

As shown in the figure, a second dielectric film 4B, a first dielectric film 1B, a second dielectric film 4A, a second dielectric film 4B, a first dielectric film 1A
Then, the second dielectric film 4A is superimposed and wound in this order so that the electrodes 2 of the first dielectrics 1A and 1B partially face each other, and then the fusion material layer 5 is applied to this wound body. 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.

As a result of the heat treatment, the second dielectric film 4A is bonded to the second dielectric film 4B, and the gaps between the second dielectric film 4A and the first dielectric films 1A and 1B as well as the gaps between the second dielectric film 4B and the first dielectric film are The gap between the body films 1A and 1B 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 having a thickness of 12 .mu.m was used, which was coated with a fusing material layer 5, which was coated or bonded as a sheet, 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 bonding 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 1500PF.

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

Capacitor A (solid line) made according to the present invention
Compared to Comparative Example B (broken line), as shown in the second diagram, the capacitance after impregnation with the impregnating agent is significantly increased compared to before impregnation. This is because capacitor A manufactured according to the present invention has an impregnating agent between one side of the first dielectric film, in which a plurality of electrodes are arranged at predetermined intervals, and the second dielectric film, compared to comparative example B. This is due to better impregnation than Comparative Example B. Capacitor A manufactured according to the present invention was subjected to a heat shock test (-30°C for 1 hour, +110°C for 1 hour) as shown in Figure 3.
The DC breakdown voltage after one cycle (1 cycle) was stable without any deterioration, and the charge/discharge test (30KV DC was charged for 1 second, then discharged for 1 second after 2 seconds, and then discharged for 2 seconds) as shown in Figure 4. The durability (with one cycle of stopping) was also significantly improved.

In addition, in the embodiment, the second dielectric film 4B
The fusing material layer 5 adhered to one side was fused to the second dielectric film 4A, but by using the second dielectric film having the fusing material layer 5 adhered to both sides, this film could be fused. The adhesive layer 5 is made of a second dielectric film 4A and a first dielectric film 4A.
It may also be fused to the non-electrode surfaces of the 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 fusing material layer 5 attached thereto is replaced with a first dielectric film 1A having a plurality of electrodes arranged at predetermined intervals.
and 1B, and then wind the first and second dielectric films 1A, 1B and 4B, 4B, 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 at high temperature, and 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 electrode arrangement surface of the first dielectric film 1A and the second
The gap between the dielectric film 4B and the electrode arrangement surface of the first dielectric film 1B and the second dielectric film 4B
Since the gaps between the two are widened, the impregnating agent is more fully impregnated into the gaps than in the past.

(Effects of the Invention) The first invention of the present application is such that the second dielectric film, which contacts the electrode-free surface of the first dielectric film among the four second dielectric films, comes into contact with at least the first dielectric film. A dielectric film is coated with a fusion material layer on one surface opposite to the surface to which the first
After winding the second dielectric film, heat treatment is performed to fuse the fusing material layer of the second dielectric film to at least another second dielectric film, and the wound first dielectric film is heated.
The gap formed by the second dielectric film is impregnated with a liquefied solid impregnating agent, and the second invention of the present application is characterized in that when the two second dielectric films are wound, the electrodes of the first dielectric film are not disposed. It is a dielectric film with a fusion material layer adhered to one side that contacts the installation surface,
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 non-electrode surface of the first dielectric film. Since the gap formed by the second dielectric film was impregnated with the liquefied solid impregnant, the first
The impregnating agent sufficiently impregnates the wide gap formed between the electrode arrangement surface of the dielectric film and the second dielectric film, and the weather resistance and withstand voltage characteristics are significantly improved compared to those using conventional methods. This has the effect of providing a high-voltage capacitor with a high voltage.

[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...Fusion material layer.

Claims (1)

[Claims] 1. A pair of first dielectric films each having a plurality of electrodes disposed at predetermined intervals on one side, with two second dielectric films interposed so that a portion of each electrode faces each other. Stack them like this, and then add a second layer above and below them.
In the method for manufacturing a series capacitor formed by overlapping and winding dielectric films, the second
Of the dielectric films, the second dielectric film that contacts the non-electrode surface of the first dielectric film has a fusion material layer coated on at least one surface of the second dielectric film that is opposite to the surface that contacts the first dielectric film. After winding the first and second dielectric films, heat treatment is performed at a temperature higher than the fusing temperature of the fusing material layer, so that the fusing material layer of the second dielectric film is bonded to at least another layer. A method for manufacturing a high-voltage capacitor, which comprises impregnating a gap formed by first and second dielectric films that are fused to a second dielectric film and wound together with a liquefied solid impregnant. 2 A pair of first dielectric films each having a plurality of electrodes disposed at predetermined intervals on one side are superimposed with a second dielectric film interposed therebetween so that a portion of each electrode faces each other, and then a plurality of electrodes are arranged on one side of the first dielectric film. In a series capacitor formed by overlapping and winding a second dielectric film on the side of the first dielectric film where is exposed,
The two second dielectric films are dielectric films having a fusing material layer adhered to one surface that contacts the electrode-free surface of the first dielectric film during winding, and
After winding the second dielectric film, heat treatment is performed at a temperature higher than the fusing temperature of the fusing material layer to apply the fusing material layer of the second dielectric film to the non-electrode surface of the first dielectric film. A method of manufacturing a high-voltage capacitor, comprising impregnating a liquefied solid impregnating agent into a gap formed by first and second dielectric films that are fused and wound.