JPS6167910A - Method of producing condenser for high voltage - 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 have proposed a method in which two dielectric films are placed one on top of the other with an intervening layer, one dielectric film is placed on top and bottom of the two, 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, 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. Naturally, the amount of impregnation is influenced by these factors, but there are limits to these factors alone, and it is impossible to achieve a higher degree of impregnation. Extending this further, the space layer to be impregnated in a film capacitor is extremely narrow, ranging from the order of several U to less than that, although there are differences in size depending on the shape of the element (cylindrical, flat, etc.). A fixed impregnating agent such as an epoxy resin is used as the impregnating agent, but the viscosity, which affects the degree of impregnation, is determined by the vacuum impregnating method.1.
Even if efforts are made to lower the viscosity, the viscosity is limited to about 100 cps.

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 (
A method of using a film with a roughened surface has been taken, but although it is very effective when using a liquid impregnant, it is still insufficient with a solid impregnant.

Although the high-voltage capacitor previously proposed by the present applicant is superior to high-voltage capacitors, it is not sufficiently impregnated, so 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 is to connect a pair of first tR electric films in which a plurality of electrodes are arranged at predetermined intervals with a second dielectric film interposed between each electrode. In the method for manufacturing a series capacitor, the second dielectric film is in contact with the non-electrode surface of the first dielectric film of the two second dielectric films; is a dielectric film having at least one surface covered with a fusing material layer, and after winding the first and second dielectric films, heat treatment is performed to heat the fusing material layer of the second dielectric film to at least cover the surface of the second dielectric film. Second
The second invention is characterized in that a gap formed by the first and second dielectric films that are attached to the dielectric film and wound is impregnated with a liquefied fixing impregnant, and the second invention is characterized in that a plurality of electrodes are In a series capacitor formed by winding a pair of first dielectric films arranged at a predetermined interval so that a portion of each electrode faces each other with a second dielectric film interposed therebetween, one film is used. The second dielectric film is a dielectric film having a fusing material layer adhered to one surface thereof, and is heat-treated after winding the first and second dielectric films to form a fusing material layer of the second dielectric film. is fused to the non-electrode surface of the first dielectric film, and the gap formed by the wound first and second dielectric films is impregnated with a liquefied mass impregnating agent.

(Example) FIG. 1 shows a side view of the dielectric and electrodes of a high-voltage capacitor manufactured using an Al layer according to an example of the first invention of the present application.

In the same figure, (1^) is a first dielectric film in which a plurality of (for example, three) electrodes (2) are arranged at predetermined intervals by vacuum-depositing metal, and (1B) is the same. A plurality of (for example, two) electrodes (2) are arranged at predetermined intervals by the method described above, and electrodes (2A) and terminal ends (2A) and (2B) are made of metal foil to which lead wires (3) are welded. (4A) is a first dielectric film disposed at a predetermined distance from the electrode (2), and (4A) is a second dielectric film on which no electrode is formed.
The dielectric film (4B) is the first dielectric film (IA
) (IB) on the non-electrode side, and a second dielectric film (4^) on which a fusion material layer (5) is applied by coating or bonding on the surface that comes into contact with the second dielectric film (4^) during winding. It is a dielectric film.

As shown in the figure, the second dielectric film (4B), the first dielectric film (1B), the second dielectric film (4A), the second
Dielectric film (48), first dielectric film (18)
and the second dielectric film (4A) in this order and the first dielectric film (4A).
The dielectric (IA) (18) is overlapped and wound so that a portion of each electrode (2) faces each other, and then this wound body is heated at a temperature higher than the fusing temperature of the fusing material layer (5). The material is then subjected to heat treatments such as thermocompression bonding and heat aging, and then vacuum impregnated with a solid impregnant made of liquefied synthetic resin.

Thus, by the heat treatment, the second dielectric film (4A) is bonded to the second dielectric film (4B), and the second dielectric film (4A) and the first dielectric films (1A) and (1B) are bonded to each other.
) The gaps and the gaps between the second dielectric film (4B) and the first dielectric films (18) and (1B) are widened, and the impregnating agent is more fully impregnated into the gaps than before.

Figures 2 to 4 show various characteristics (capacitance change rate during the work process, DC wave tl voltage after human shock test) of high-voltage capacitors manufactured by the manufacturing method of the embodiment of the present invention and the conventional method. , durability of charge/discharge tests).

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

Thickness 61L as the first dielectric film (1^) (IB)
Using an aluminum-coated polyester film, if &
(2A) (2B) is an aluminum foil with a thickness of 5tL,
The lead wire (3) to be welded to it is 0.5. A line of φ was used for each. In addition, a polyester film with a thickness of 61 L was used as the second dielectric film (3A), and a polyester film was used as the second dielectric film (4B). A film with a thickness of 12 tL was used, which was covered with a fusing material layer (5) coated with a solvent-based adhesive or bonded as a sheet as shown in the figure.

After winding the dielectric film, the adhesive has a heat contact point 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.

Note that the lead wire (3) was welded onto the electrode (2^) (2Bl) at a distance of about 10 # from the edge of the portion facing the electrode (2).

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

As a comparative example, the second X Z to which the fusing material layer (5) was applied
Ten capacitors were made for each test, except that a 12 micron thick polyester film was used in place of the body film, but otherwise the same as above.

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 the test (-30°C 1 hour, +110°C 1 hour as one cycle) was stable without deterioration, and as shown in Figure 4, the charge/discharge test (DC 3 V for 1 second) was confirmed. Charge and then discharge for 1 second after 2 seconds 2
The durability (where a second stop is counted as one cycle) has also been significantly improved.

In the above embodiment, the fusion material layer (5) applied to the - side of the second dielectric film (4-B) was fused to the second dielectric film (4^). 1 dielectric film (18)
Further, by using a second dielectric film having a fusing material layer (5) on both sides, the fusing material layer (5) of this film may be fused to the non-electrode surface of the film. 2 dielectric film (4
A) and the electrode-free surface of the first dielectric film (IA) (IB) may be fused.

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 example, the fusing material layer (5) is applied to the negative side of the 1
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 first and second dielectric films (1
8) (1B) and (4B) (4B) are wound, and then this wound body is heat-treated at a temperature higher than the bonding temperature of the fusing material of the fusing material layer (5), and then the synthetic resin is heated. Impregnate with 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 arrangement surface of the first dielectric film (1A) and the second dielectric film (4B) and the gap between the first dielectric film (1A) and the second dielectric film (4B)
Since the gap between the electrode disposed surface in B) and the second dielectric film (4B) is widened, the impregnating agent is impregnated into the gap within 1 minute compared to the conventional method.

(Effects of the Invention) The first invention of the present application provides a second dielectric film that is in contact with the non-electrode surface of the first dielectric film among the two second dielectric films, and has a fusion layer on at least one surface. Using the deposited dielectric film, after winding the first and second dielectric films, heat treatment is performed to form a bonding material layer of the second dielectric film to at least b(l!!) of the second dielectric film. In the second invention of the present application, the gap formed by the first and second dielectric films that are fused to the film and wound is impregnated with a liquefied solid impregnant. A dielectric film having a fusing material layer adhered to one surface thereof, and heat-treated after winding the first and second dielectric films to convert the fusing material layer of the second dielectric film to that of the first dielectric film. Since the liquefied solid impregnant was impregnated into the gap formed by the fusion bond and the wound first and second dielectric films on the non-electrode surface,
The impregnating agent is sufficiently impregnated into the wide gap formed between the electrode-arranged surface of the first dielectric film and the second dielectric film, and the weather resistance and withstand voltage properties are improved compared to the conventional method. This has the effect of providing a significantly improved high voltage capacitor.

[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. (IA) (IB)...First dielectric film (2) (2
A) (2B)... Electrode (3)... Lead wire (4A) (4B)... Second dielectric film (5)...
・Showa period
55.10i 7th

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, of the two second dielectric films, the second dielectric film that contacts the non-electrode surface of the first dielectric film has a fusion material layer on at least one surface. is a dielectric film having a first and second
After the dielectric film is wound, 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 and second dielectric films are formed. A method for manufacturing a high-voltage capacitor, characterized by impregnating a liquefied fixed impregnating agent into the gap formed by the liquid. 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 non-electrode surface of the first dielectric film, and impregnating the gap formed by the wound first and second dielectric films with a liquefied mass impregnating agent. A method of manufacturing a high voltage capacitor, which is characterized by: