JPS62186512A - Metallized film capacitor - 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 metallized film capacitors, particularly AC1
This invention relates to improvements in metallized film capacitors for electrical equipment used at 50V or higher.

BACKGROUND OF THE INVENTION Conventionally, air conditioners for electrical equipment used at a voltage of 150 V or more have had the problem of deterioration of dielectric materials and deterioration of metal thin film electrodes due to partial discharge. In order to suppress partial discharge in metallized film capacitors, various methods of bonding film layers have been proposed. One method is to not only subject the film to corona discharge treatment as a base for metallization treatment, but also apply corona discharge treatment to the surface of the film that overlaps and contacts the metallized surface, followed by heat treatment to provide interlayer adhesion. Other methods include coating or laminating the film surface with a substance that acts as a glue, or impregnating the element with a solvent, surfactant, etc.

Problems to be Solved by the Invention However, as a result of various studies on the above-mentioned capacitors, it has been found that their characteristics deteriorate, especially after being energized for a very long time.

Means for Solving the Problems The present invention provides a metallized film capacitor element with a film interlayer adhesion strength of 5 grams or more when converted to a 201ff width, and a fixed exterior having a hardness (Shore-D) of 17 or more. The exterior is made of wood.

Effects In the above configuration, if the interlayer strength of the film is less than 6 grams, it is not preferable because stress such as heating and cooling cycles will cause interlayer peeling in the 3N-conductor element, causing void discharge. Further, it is preferable that the interlayer adhesive strength is as large as possible. Furthermore, if the hardness (Shore-D) of the exterior material is 17 or more, the properties after a very long time (
Insulation resistance and capacitance reduction) can be stabilized.

Note that the electrodes include Zn, mulch, Ni, Ni-0r,
Go.

Cu, Mo, Ti, etc. are used, and Zn is particularly effective.

Solid exterior materials include urethane resins, epoxy resins, diallyl phthalate resins, unsaturated polyester resins, guanamine resins, phenolic resins, urea resins, melamine resins, acrylic resins, silicone resins, and thermal resins. Casting, impregnating, and dipping with hardened polyimide resin, paraffin wax, microcrystalline wax, polyethylene wax, and various other synthetic waxes.

Coat using methods such as powder coating and heat curing.

It is cured using methods such as UV curing and EB curing to form the exterior.

Methods for imparting single-layer adhesion include corona discharge treatment of the film surface that overlaps and contacts the metallized surface of the metallized film capacitor element, and methods that include laminating or activating a substance with a relatively low melting point on the film surface. Examples include a method of attaching something such as a surfactant, and a method of impregnating a liquid (solvent, surfactant, etc.) that imparts adhesiveness into the capacitor element.

However, the method for measuring the adhesive strength between film layers is to first disassemble the capacitor, take out the capacitor element 17, cut the film into a 20 mm width, fix one side 11, and pull the other side 12 as shown in Figure 6. Measure with a spring balance, etc. 3. The adhesive strength may be greater near the core than in the overseas part, but in such cases, the value closer to the overseas part (i.e., the average value for the part 100 turns from the overseas part) ).

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the attached notes.

In Figure 1, 1 is a polypropylene film with a thickness of 6 μm and a width of 80 mm to 6 mm and which has been treated with corona discharge on both sides.
Toshisha; product name YK-41) Zn was vacuum-deposited on one side of the electrode so that the main electrode part 2a was thin (20 to 3 Ω/mouth) and the metal contact part 2b was thick (3 to 4 Ω 10 ). did. Note that 3 is a corona discharge treatment section, and 4 is a metal vapor deposition base corona discharge treatment section. This pair of metallized films was wound up and used as a capacitor element (60 μF), with
Zn metallicon was applied and heated at 115℃ for 16℃ in a vacuum chamber.
H heat treatment was performed. After this, we welded the lead wires, stored them in a suitable case (aluminum case or polyester resin case), and covered them with various exterior materials to create a metallized film capacitor.

In the structure shown in FIG. 1 above, the corona discharge treatment strength was changed to change the interlayer adhesion strength, and the characteristics of a prototype capacitor were manufactured and the characteristics are shown in FIG. This is a result of examining the corona onset voltage after 100 heat cycles from -30°C to 100°C, and it can be seen that excellent adhesion can be maintained by setting the interlayer adhesion strength to 5 grams or more. .

6.7 In addition, a high temperature continuous durability test (
The main results are shown in Table 1 and summarized in Figs. 3 and 4 (ICIA standard: ±3% (2000H)).

As can be seen from this example, the hardness of the exterior material is 1-J or higher.
2. Characteristics after a very long time (insulation resistance (
It can be seen that this stabilizes the CR) and capacity decrease (-ΔC). Table 1 shows the results of changing the exterior material for the structure shown in Figure 1, but in addition, the sample (G) and (B) in Figure 5 was packaged with epoxy resin (filler: 90D). When the electrode (Zn) was evaluated in the same manner, compared to the structure shown in FIG. 1, it showed superior epoch reliability compared to an epoxy resin product with a hardness of 9D, although there was some variation in the initial pressure test.

(Hereinafter, blank space) 7 ・\-2 In the electrode configuration shown in FIG. 1, the main electrode part 21
By setting the electrode resistance of L to 8Ω/gate (Zn) or more, a more effective capacitor can be realized.

Effects of the Invention As described above, according to the present invention, it is possible to provide a high-voltage metallized film capacitor with excellent reliability over time.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of a metallized film capacitor according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between film interlayer adhesion strength and corona onset voltage of the same capacitor, and Fig. 3 is a characteristic diagram of the same capacitor. Figure 4 is a characteristic diagram showing the relationship between the shore hardness of the exterior material and insulation resistance, and Figure 6 is a characteristic diagram showing the relationship between the shore hardness of the exterior material and capacitance change of the same capacitor.
The figure is a sectional view of a main part of a metallized film capacitor according to another embodiment of the present invention, and FIG. 6 is a perspective view showing a method for measuring the adhesive strength between film layers. 1...Polypropylene film, 2a...
...To main mold 9-/chamber, 2b...Metallic contact part, 3...
... Corona discharge treatment section, 4... Metal vapor deposition base corona discharge treatment section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Puil 4/view 7x # View A (Japanese Figure 3 Figure 4 Seats A further 7 CD) Figure 5 2α @ Figure 6

Claims (1)

[Claims] A metallized film capacitor element having an adhesive strength between film layers of 5 grams or more when converted to a width of 20 mm, and the metallized film capacitor element being packaged with a solid exterior material having a hardness (Shore-D) of 17 or more. Film capacitor.