JP2007234627A - Metallized film capacitor and capacitor element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallized film capacitor in which moisture resistance is high and capacitance reduction is difficult to occur. <P>SOLUTION: In a capacitor element 1 included in the metallized film capacitor, a side of a winding object 2 to which a pair of metallized films are wound with thickness of 12 μm is coated with a moisture absorption prevention film 3 functioning as an insulated protection layer, a wetproof enhanced multilayer laminated film 4, and a polyester adhesive tape 5 in order from an inner side. Electrode drawing-out parts 6 are attached in both end faces of the winding object 2 by thermally spraying a metal. The moisture-proof enhanced multilayer laminated film 4 has performance of oxygen transmittance of 5.0 cm<SP>3</SP>/(m<SP>2</SP>×day×MPa) or below, and water vapor transmittance of 0.3g/(m<SP>2</SP>×day) or below. The moisture-proof enhanced multilayer laminated film 4 is wound to the side of the winding object 2 twice. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a metallized film capacitor using a metallized film and a capacitor element used therefor.

  A dry metallized film capacitor element using a metallized film has a structure in which a moisture absorption prevention film such as a laminate film is wound around an element obtained by winding a pair of metallized films, and a polyester adhesive tape is wound around the exterior (See Patent Document 1).

JP-A-5-159968

  A dry metallized film capacitor having a structure in which a moisture absorption preventing film such as a laminate film and a polyester adhesive tape are wound around a wound body formed by winding a pair of metallized films is a moisture resistance test (temperature) of JEM1419. Under severer conditions (temperature 85 ° C., humidity 85% RH, 500 hours) at 40 ° C. and humidity 90 to 95% RH, 500 hours, moisture and oxygen permeate the moisture absorption preventing film and the polyester adhesive tape, and the wound body There is a problem that the capacity is easily reduced by entering the inside. Such a decrease in capacity becomes more prominent as the ambient temperature increases.

  An object of the present invention is to provide a metallized film capacitor that has high moisture resistance and is less susceptible to capacity reduction, and a capacitor element used therefor.

The metallized film capacitor of the present invention solves the above-mentioned problem, and is a wound body formed by winding a pair of metallized films, and an electrode lead formed by metal spraying on both end faces of the wound body In a metallized film capacitor in which a capacitor element having a portion is solder-connected to a plurality of connection plates and the electrode lead-out portion is housed in a case and the case is filled with a resin, the capacitor element has oxygen permeability Moisture-resistant multilayer laminate film having a degree of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor transmission rate of 0.3 g / (m ² · day) or less is wound on the side surface of the wound body two or more times. It will be turned.

  In the present specification, the oxygen permeability of the moisture-resistant reinforced multilayer laminate film is measured by the JIS K7126B method (isobaric method) under the test conditions of 30 ° C. and 70% RH, and the water vapor permeability is measured by the JIS K7129B method. It was measured under the test conditions of 40 ° C. and 90% RH.

The capacitor element of the present invention is a capacitor element for a metallized film capacitor having a wound body formed by winding a pair of metallized films, and electrode lead portions formed by metal spraying on both end faces of the wound body. Further, a moisture-resistant reinforced multilayer laminate film having an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor permeability of 0.3 g / (m ² · day) or less is formed on the side surface of the wound body. It is wound more than once.

  In the present invention, the resin filled in the case may be a thermosetting resin.

  In that case, the thermosetting resin may be any one selected from the group consisting of a urethane resin, an epoxy resin, and a silicon resin.

  In this invention, the side surface of the said wound body may be coat | covered with the moisture absorption prevention film, the said moisture-proof reinforcement | strengthening multilayer laminate film, and the polyester adhesive tape in order from the inner side.

According to the present invention, a moisture-resistant reinforced multilayer laminate film having an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor permeability of 0.3 g / (m ² · day) or less is applied to the wound body. By winding two or more times on the side surface, it is possible to obtain a metallized film capacitor having a practically sufficient moisture resistance and a capacitor element used therefor, which hardly causes a decrease in capacity. For example, it becomes possible to give sufficient moisture resistance in an environment where the temperature is 85 ° C. and the humidity is 85%, and its value is extremely large industrially and practically.

  1A and 1B are a front view and a side view, respectively, of a capacitor element included in a metallized film capacitor according to an embodiment of the present invention. As shown in FIG. 1A, the capacitor element 1 has a substantially cylindrical shape, and its capacitance is 50 μF. The capacitor element 1 has a moisture absorption preventing film 3 (thickness of 30 μm) in which the side surface of the wound body 2 obtained by winding a pair of metallized films having a thickness of 12 μm many times also functions as an insulating protective layer in order from the inside. × 25 turns), a moisture-resistant reinforced multilayer laminate film 4 and a polyester adhesive tape 5 (thickness 50 μm × 4 turns), and a metal (alloy such as tin / zinc) on both end faces of the wound body 2 The electrode lead-out part 6 is attached by thermal spraying (metallicon).

The moisture-resistant reinforced multilayer laminate film 4 includes a multilayer structure (nylon film (NY), GX film (trade name: transparent vapor deposition barrier film manufactured by Toppan Printing Co., Ltd.)) and polyolefin film (POF) having a total thickness of about 100 μm. And having an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) and a water vapor permeability of 0.3 g / (m ² · day).

  Among the three-layered films, a GX film in which a gas barrier layer composed of a vapor deposition layer and a barrier coat layer is formed on a resin film serving as a substrate mainly has moisture resistance. Nylon film has little change in physical properties due to temperature and is excellent in alkali resistance, organic solvent resistance and oil resistance, but not in acid resistance. Moreover, since it has water absorption, it is inferior to dimensional stability and an electrical property. However, by laminating the nylon film and the polyolefin film, the moisture resistant reinforced multilayer laminate film 4 is an excellent film from the viewpoint of cold resistance and heat resistance and also from the viewpoint of barrier properties against water, oil, gas and the like. Yes.

  The moisture resistant reinforced multilayer laminate film 4 is wound around the side surface of the moisture absorption preventing film 3 twice (in FIG. 1A and FIG. 1B, in order to simplify the illustration, the moisture resistance enhanced The number of windings of the multilayer laminate film 4 is not shown).

  The moisture-resistant reinforced multilayer laminate film 4 is manufactured by repeating a dry lamination method in which an adhesive dissolved in a solvent is applied to one substrate and dried, and then the other substrate is bonded. Further, the oxygen permeability and water vapor permeability of the moisture-resistant reinforced multilayer laminate film 4 have a correlation that when one increases, the other increases.

  FIG. 2 shows a plan view of the metallized film capacitor 10 according to the present embodiment. In the metallized film capacitor 10 shown in FIG. 2, three capacitor elements 1 are arranged in parallel so as to be adjacent to each other in the width direction. The three capacitor elements 1 are solder-connected by the connection plate 14.

  Further, three electrode lead portions 6 positioned on a straight line are accommodated in the resin case 15. The inside of the resin case 15 is filled with an epoxy resin that is a thermosetting resin. In this way, a 150 μF metallized film capacitor 10 is configured.

  In addition, as a filler, you may use what mixed the epoxy resin and other thermosetting resins, such as a urethane resin and / or a silicone resin, instead of an epoxy resin single-piece | unit. Epoxy resins, urethane resins, and silicon resins are advantageous in that they are easily available compared to other thermosetting resins, are low-cost, and can be used at high temperatures.

In the metallized film capacitor 10 according to the present embodiment, the moisture-resistant reinforced multilayer laminate film 4 has an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) and a water vapor permeability of 0.3 g / (m ² · day), it has excellent moisture resistance, as will be described in detail later.

Hereinafter, modifications of the metalized film capacitor 10 according to the above-described embodiment will be described. As a modification, in the capacitor element 1 described above, the moisture-resistant reinforced multilayer laminate film 4 has an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor permeability of 0.3 g / ( m ² · day) is arbitrarily changed within the following range.

Example 1
Ten metallized film capacitors 10 shown in FIG. 2 were prepared, and a humidity resistance test was performed for 500 hours at a temperature of 85 ° C., a humidity of 85% RH, and an applied voltage of 1650 VDC. The results are shown in Table 1. As can be seen from Table 1, the capacity change rate before and after the moisture resistance test is distributed between -1.3% and -2.7%. Thus, it was confirmed that the metallized film capacitor of Example 1 had sufficient moisture resistance.

(Comparative Example 1)
Ten metallized film capacitors having the same structure as the metallized film capacitor 10 shown in FIG. 2 were produced except that the moisture-resistant reinforced multilayer laminate film 4 was not wound. Then, a moisture resistance test was performed under the same test conditions as in Example 1. The results are shown in Table 1. As can be seen from Table 1, the capacity change rate before and after the moisture resistance test is distributed between -9.93% and -15.0%.

  From the capacity change rates of Example 1 and Comparative Example 1, it was confirmed that the moisture resistance was significantly improved by winding the moisture-resistant reinforced multilayer laminate film on the side surface of the wound body 2.

(Examples 2 to 6)
Two metallized film capacitors 10 (Example 2) shown in FIG. 2 were produced, and the number of turns of the moisture-resistant reinforced multilayer laminate film 4 was 3 (Example 3), 4 (Example 4), and 5 (implemented). Except for Example 5) and 6 times (Example 6), three metallized film capacitors each having the same structure as the metallized film capacitor 10 shown in FIG. 2 were produced. Then, a total of 15 metallized film capacitors of Examples 2 to 6 were subjected to a moisture resistance test under the same test conditions as in Example 1. The results are shown in Table 2 and FIG. In addition, a value is an average value of three each.

  As can be seen from Table 2 and FIG. 3, the average capacity change rate before and after the moisture resistance test was −1.5% in Example 2, −1.3% in Example 3, and −0 in Examples 4-6. 8%.

(Comparative Examples 2-9)
Three metallized film capacitors (Comparative Example 2) having the same structure as the metallized film capacitor 10 shown in FIG. 2 except that the moisture-resistant reinforced multilayer laminate film 4 is not wound are manufactured, and the moisture-resistant reinforced multilayer laminate film Three metallized film capacitors each having the same structure as that of the metallized film capacitor 10 shown in FIG. 2 were prepared except that the number of turns of 4 was changed to 1 (Comparative Example 3). Further, the oxygen permeability and the water vapor permeability are 8.0 cm ³ / (m ² · day · MPa) and 0.63 g / (m ² · day), respectively, and the number of turns of the moisture-resistant reinforced multilayer laminate film 4 is one time. (Comparative Example 4) 2 times (Comparative Example 5) 3 times (Comparative Example 6) 4 times (Comparative Example 7) 5 times (Comparative Example 8) 6 times (Comparative Example 9) Three metallized film capacitors each having the same structure as the metallized film capacitor 10 shown in FIG. Then, a moisture resistance test was performed under the same test conditions as in Example 1. The results are shown in Table 2 and FIG. In addition, a value is an average value of three each.

  As can be seen from Table 2 and FIG. 3, the average capacity change rate before and after the moisture resistance test was -5.6%, which was the best.

From the results of Examples 2 to 6 and Comparative Examples 2 to 9, the number of turns of the moisture-resistant reinforced multilayer laminate film was twice when the oxygen permeability was 5.0 cm ³ / (m ² · day · MPa) or less. It has been confirmed that the above is extremely effective.

On the other hand, when the oxygen permeability is 8.0 cm ³ / (m ² · day · MPa), it can be confirmed that the effect obtained even when the number of turns of the moisture-resistant reinforced multilayer laminate film is two or more is limited. It was.

(Examples 7 to 10)
1. Oxygen permeability and water vapor permeability of the moisture-resistant reinforced multilayer laminate film 4 are 1.0 cm ³ / (m ² · day · MPa) and 0.04 g / (m ² · day), respectively (Example 7). ^{0cm 3 / (m 2 · day} · MPa) and ^{0.05g / (m 2 · day)} ( example ^{8), 3.0cm 3 / (m} 2 · day · MPa) and 0.09g / ^{(m 2} · day) (Example 9), except for 4.0 cm ³ / (m ² · day · MPa) and 0.15 g / (m ² · day) (Example 10), the metallized film capacitor 10 shown in FIG. Five metallized film capacitors each having the same structure were prepared. A total of 20 metallized film capacitors of Examples 7 to 10 were subjected to a moisture resistance test under the same test conditions as in Example 1. The results are shown in Table 3 and FIG.

  As can be seen from Table 3 and FIG. 4, the average capacity change rate before and after the moisture resistance test was −1.0% in Example 7, −1.1% in Example 8, and −1.2 in Example 9. %, -1.4% in Example 10, and -1.5% in Example 2.

(Comparative Examples 10-15)
6. Oxygen permeability and water vapor permeability of the moisture resistant reinforced multilayer laminate film 4 are 6.0 cm ³ / (m ² · day · MPa) and 0.42 g / (m ² · day) (Comparative Example 10), respectively. 0 cm ³ / (m ² · day · MPa) and 0.5 g / (m ² · day) (Comparative Example 11), 9.0 cm ³ / (m ² · day · MPa) and 0.75 g / (m ² · MPa) day) (Comparative Example 12), 10.0 cm ³ / (m ² · day · MPa) and 0.9 g / (m ² · day) (Comparative Example 13), 11.0 cm ³ / (m ² · day · MPa ) And 1.05 g / (m ² · day) (Comparative Example 14), 12.0 cm ³ / (m ² · day · MPa) and 1.15 g / (m ² · day) (Comparative Example 15) Is a metallized film capacitor having the same structure as the metallized film capacitor 10 shown in FIG. It was produced five each. Then, a total of 30 metallized film capacitors of Comparative Examples 10 to 15 were subjected to a moisture resistance test under the same test conditions as in Example 1. The results are shown in Table 3 and FIG.

  As can be seen from Table 3 and FIG. 4, the average capacity change rate before and after the moisture resistance test was −3.0% in Comparative Example 10, −4.4% in Comparative Example 11, and −8.5 in Comparative Example 12. %, Comparative Example 13 was -9.7%, Comparative Example 14 was -10.1%, Comparative Example 15 was -10.4%, and Comparative Example 5 was -6.5%.

From the results of Examples 2 and 7 to 10 and Comparative Examples 5 and 10 to 15, the oxygen permeability and water vapor permeability in the moisture-resistant reinforced multilayer laminate film are as follows: oxygen permeability is 5.0 cm ³ / (m ² · day · MPa It was confirmed that the water vapor permeability was preferably 0.3 g / (m ² · day) or less.

As a modification, in the capacitor element 1 described above, the moisture-resistant reinforced multilayer laminate film 4 has an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor permeability of 0.3 g / (m ² · day) In the examples, what was arbitrarily changed within the following range was presented, but as another modification, the number of turns of the moisture-resistant reinforced multilayer laminate film 4 may be three or more. As another modification, the moisture absorption preventing film 3 may be omitted. As yet another modification, the resin case 15 may be filled with a resin other than the thermosetting resin.

It is the front view and side view of a capacitor | condenser element which are contained in the metallized film capacitor which concerns on one embodiment of this invention. It is a top view of the metallized film capacitor which concerns on one embodiment of this invention containing the capacitor | condenser element shown in FIG. It is the graph showing the relationship between the winding number of a moisture-proof reinforcement | strengthening multilayer laminate film and a capacity change rate in Examples 2-6 and Comparative Examples 2-9. It is a graph showing the relationship between the oxygen permeability of the moisture-proof reinforced multilayer laminate film, water vapor permeability, and capacity change rate in Examples 2, 7 to 10 and Comparative Examples 5 and 10-15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Winding body 3 Moisture absorption prevention film 4 Moisture-proof reinforced multilayer laminate film 5 Polyester adhesive tape 6 Electrode drawing part 10 Metallized film capacitor 14 Connection board 15 Resin case

Claims (5)

A winding body formed by winding a pair of metallized films, and a capacitor element having electrode lead portions formed by metal spraying on both end faces of the winding body are solder-connected to a plurality of connection plates, and In the metalized film capacitor in which the electrode lead-out part is housed in the case and the inside of the case is filled with resin,
The capacitor element has a moisture-resistant reinforced multilayer laminate film having an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor permeability of 0.3 g / (m ² · day) or less. A metallized film capacitor, wherein the metallized film capacitor is wound twice or more on the side surface of the metal film.   The metallized film capacitor according to claim 1, wherein the resin filled in the case is a thermosetting resin.   The metallized film capacitor according to claim 2, wherein the thermosetting resin is any one selected from the group consisting of a urethane resin, an epoxy resin, and a silicon resin.   The side surface of the wound body is covered with a moisture absorption preventing film, the moisture-resistant reinforced multilayer laminate film, and a polyester pressure-sensitive adhesive tape in order from the inside. Metalized film capacitor. In a wound body formed by winding a pair of metallized films, and a capacitor element for a metallized film capacitor having electrode lead portions formed by metal spraying on both end faces of the wound body,
A moisture-resistant reinforced multilayer laminate film having an oxygen permeability of 5.0 cm ³ / (m ² · day · MPa) or less and a water vapor permeability of 0.3 g / (m ² · day) or less is applied to the side surface of the wound body twice. A capacitor element that is wound as described above.

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