阅读说明：本技术 一种内部串联型自愈式金属化膜及电容器 (Internal series self-healing metallized film and capacitor ) 是由 吴立周 耿昊 赵玺 谢战洪 李翔宇 古刚 林灿 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种内部串联型自愈式金属化膜,包括基膜,所述基膜上设置有基膜空白区,所述基膜空白区两侧的基膜上分别均敷设有金属镀层平整区,其中一侧的金属镀层平整区内包含有留边加厚区,另一侧的金属镀层平整区内包含有金属镀层串联导电加厚区,所述电容器,包括两个电容极板,两个电容极板均所述的自愈式金属化膜,可减少电容器发热、减小了电阻和损耗、延长使用寿命；加宽的留边区和空白区增大了留边和空白区的尺寸,保证了绝缘距离,降低了薄膜间击穿的概率,增加了电容器可靠性、延长了金属化膜的寿命。(The invention discloses an internal series self-healing metallized film, which comprises a base film, wherein a base film blank area is arranged on the base film, metal coating leveling areas are respectively laid on the base film on two sides of the base film blank area, the metal coating leveling area on one side comprises a margin thickening area, the metal coating leveling area on the other side comprises a metal coating series conductive thickening area, and the capacitor comprises two capacitor plates which are both the self-healing metallized film, so that the heating of the capacitor can be reduced, the resistance and the loss are reduced, and the service life is prolonged; the widened margin area and the blank area increase the size of the margin area and the blank area, ensure the insulation distance, reduce the probability of breakdown between films, increase the reliability of the capacitor and prolong the service life of the metallized film.)

1. An internal series self-healing metallized film, comprising a base film (1), characterized in that: the base film is characterized in that a base film blank area (3) is arranged on the base film (1), metal coating flat areas (4) are respectively laid on the base film (1) on two sides of the base film blank area (3), wherein the metal coating flat area (4) on one side comprises a margin thickened area (6), and the metal coating flat area (4) on the other side comprises a metal coating series-connection conductive thickened area (5).

2. The internal series self-healing metallized film of claim 1, wherein: on base film (1) and with the relative one end in margin thickened area (6) still is provided with base film margin area (2), base film blank space (3) are located in metallic coating levelling zone (4), base film blank space (3) will metallic coating levelling zone (4) are cut apart into the halving.

3. The internal series self-healing metallized film of claim 1, wherein: the thickness of the edge-retaining thickened area (6) is greater than that of the metal coating flat area (4), and the thickness of the metal coating series-connection conductive thickened area (5) is greater than that of the metal coating flat area (4).

4. The internal series self-healing metallized film of claim 3, wherein: the square resistance value of the metal coating flat area (4) is 60-200 omega, the square resistance value of the metal coating series connection conductive thickened area (5) is 2-10 omega, and the square resistance value of the margin thickened area (6) is 2-10 omega.

5. The internal series self-healing metallized film of claim 1, wherein: the metal coating leveling area (4) is laid on the base film (1) by vacuum evaporation or vacuum sputtering.

6. The internal series self-healing metallized film of claim 1, wherein: the base film (1) is polypropylene, polyester, polyethylene terephthalate, polyphenylene sulfide or polyvinylidene fluoride and polymers thereof.

7. A capacitor comprising two capacitor plates, characterized in that: both capacitor plates are self-healing metallized films as claimed in any one of claims 1 to 6.

8. The capacitor of claim 7, wherein: the two capacitor plates are arranged in a staggered mode.

9. The capacitor of claim 8, wherein: the margin thickening area (6) on one capacitor plate and the base film margin area (2) on the other capacitor plate are arranged at the same end in a staggered manner.

10. A capacitor according to claim 9, wherein: the metal coating series connection conductive thickened area (5) on one capacitor plate and the base film blank area (3) on the other capacitor plate are arranged correspondingly.

Technical Field

The invention belongs to the technical field of capacitors, and particularly relates to an internal series self-healing metallized film and a capacitor.

Background

The phenomenon that the electrical property of the metallized film dielectric is restored to the electrical property before breakdown instinctively immediately after the metallized film dielectric is locally broken down is called self-healing, and the metallized film capacitor has the self-healing function. As the self-healing times and area increase, the capacitance of the capacitor decreases, and the decrease of the capacitance by 5% is generally used as the critical value of the end of life of the capacitor.

The degree and speed of self-healing of the capacitor are related to the reasonability of the metal coating, such as the thickness of the metal coating, the width of the margin and the like, besides the medium material, such as air bubbles, impurities and the like between films. Research shows that after the metallized films are connected in series, the current of the series conductive area is concentrated, the generated heat can accelerate the aging of the dielectric film, and the service life of the capacitor is shortened; and when the service life of the self-healing metallized film capacitor is over, the self-healing breakdown point of the metallized film is mostly generated at the edge of the metal coating.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides an internal series self-healing metallized film and a capacitor.

The specific scheme is as follows:

the utility model provides an inside tandem type self-healing metallized film, includes the base film, be provided with the blank area of base film on the base film, all laid the metallic coating levelling zone on the base film of the blank area both sides of base film respectively, wherein contain in the metallic coating levelling zone of one side and keep somewhere the limit thickening area, contain the electrically conductive thickening area of metallic coating series connection in the metallic coating levelling zone of opposite side.

The last and with the relative one end in margin thickening district still is provided with the base film and remains the limit district, the base film blank space is located in the metallic coating leveling district, the base film blank space will the metallic coating leveling district is cut apart into the halving.

The thickness of the margin thickening area is greater than that of the metal coating leveling area, and the thickness of the metal coating serial connection conductive thickening area is greater than that of the metal coating leveling area.

The square resistance value of the metal coating flat area is 60-200 omega, the square resistance value of the metal coating series connection conductive thickened area is 2-10 omega, and the square resistance value of the margin thickened area is 2-10 omega.

The metal coating leveling area is laid on the base film by vacuum evaporation or vacuum sputtering.

The base film is polypropylene, polyester, polyethylene terephthalate, polyphenylene sulfide or polyvinylidene fluoride and polymers thereof.

A capacitor comprises two capacitor plates, wherein the two capacitor plates are the self-healing metallized film.

The two capacitor plates are arranged in a staggered mode.

The margin thickening area on one capacitor plate and the base film margin area on the other capacitor plate are arranged at the same end in a staggered manner.

The metal coating series connection conductive thickened area on one capacitor plate and the blank area of the base film on the other capacitor plate are arranged correspondingly.

The invention discloses an internal series self-healing metallized film, which is internally connected in series by utilizing a metal coating, wherein the metal coating in a series conductive area is thickened, and the metal coating is connected with the conductive thickened area in series to reduce the resistance of a series conductive area in the film, reduce the heating of a capacitor, reduce the resistance and loss and prolong the service life; the widened margin area and the blank area increase the size of the margin area and the blank area, ensure the insulation distance, reduce the probability of breakdown between films, increase the reliability of the capacitor and prolong the service life of the metallized film.

Drawings

Fig. 1 is a schematic view of the structure of the metallized film of the present invention.

Fig. 2 is a schematic structural diagram of the capacitor of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the implementations of the present invention, and not all implementations, and all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any inventive work are within the scope of the present invention.

As shown in fig. 1, an inside tandem type self-healing metallized film, includes base film 1, be provided with base film blank 3 on the base film 1, all laid metallic coating levelling area 4 on the base film 1 of base film blank 3 both sides respectively, wherein contain the margin thickened area 6 in the metallic coating levelling area 4 of one side, contain the electrically conductive thickened area 5 of metallic coating series connection in the metallic coating levelling area 4 of opposite side.

Base film 1 go up and with the one end that keeps away the relative of limit thickened area 6 still is provided with base film and keeps aside limit district 2, base film blank 3 is located in metallic coating levelling area 4, base film blank 3 will metallic coating levelling area 4 is cut apart into the halving. The blank area 3 of the base film mainly plays a role of insulation and isolation.

The self-healing metallized film capacitor takes a film of a vapor plating metal layer as a main material, and after the metallized film is wound to form a cylindrical or flat shape, the vapor plating metal electrodes are electrically connected with an external circuit at two ends through gold spraying. The metallized film is a key raw material for rolling production of the capacitor, and the metallized film used for producing the self-healing capacitor generally at present is a polypropylene metallized film formed by evaporating aluminum and zinc on a polypropylene film and evaporating zinc-aluminum alloy or silver-zinc alloy at the edge.

In this embodiment, the base film 1 is an electrical grade organic film, and commonly used materials include polypropylene, polyester, polyethylene terephthalate, polyphenylene sulfide, polyvinylidene fluoride, and polymers thereof. The base film 1 is coated with a metal layer by evaporation, the metal type comprises aluminum, aluminum-zinc composite and the like, and the evaporation mode comprises vacuum evaporation or vacuum sputtering. Preferably, the base film 1 is a biaxially oriented polypropylene film BOPP, the width of the base film 1 is 120mm, and the thickness of the base film 1 is 5.0 μm.

The metallic coating leveling zone 4 mainly used stores electric charge, preferably, the metallic coating leveling zone 4 width is 33mm, the electrically conductive thickened area of metallic coating series connection 5 mainly used reduces the resistance of the interior series connection conduction region of membrane, reduces and generates heat, increase of service life, preferably, the electrically conductive thickened area of metallic coating series connection 5 width is 5.5 mm.

In addition, the base film edge-retaining area 2 is wider than the edge-retaining width of a general self-healing capacitor, so that the insulation distance between two electrodes of a metal coating is ensured, the reliability is increased, the service life is prolonged, and preferably, the width of the base film edge-retaining area 2 is 4.5 mm.

Blank 3 of base film compare the limit broad that remains of general self-healing capacitor, guaranteed the insulation distance between the series connection membrane, increased the reliability, prolonged life, preferably, 3 width in blank of base film are 5.5 mm.

The edge-reserving thickened area 6 is a metal coating edge-reserving thickened area 6, the metal coating edge-reserving thickened area 6 is fixed on the metal coating leveling area 4, and the metal coating series-connection conductive thickened area 5 is fixed on the metal coating leveling area 4. The margin thickening area 6 of the metal coating is mainly used for being bonded with metal spraying at two ends of the metallized film to form two leading-out electrodes of the capacitor. Preferably, the width of the margin thickening region 6 of the metal coating is 5.5mm,

the thickness of the edge-retaining thickened area 6 is greater than that of the metal coating flat area 4, and the thickness of the metal coating series-connection conductive thickened area 5 is greater than that of the metal coating flat area 4. The square resistance value of the metal coating flat area 4 is 60-200 omega, the square resistance value of the metal coating series connection conductive thickened area 5 is 2-10 omega, and the square resistance value of the margin thickened area 6 is 2-10 omega. Because the thickness of the margin thickening area 6 and the thickness of the metal coating layer series connection conductive thickening area 5 are both larger than the thickness of the metal coating layer leveling area 4, the square resistance value of the margin thickening area 6 and the square resistance value of the metal coating layer series connection conductive thickening area 5 are both smaller than the square resistance value of the metal coating layer leveling area 4.

As shown in fig. 2, a capacitor includes two capacitor plates, and the two capacitor plates are both the self-healing metalized films.

The two capacitor plates are arranged in a staggered mode. Preferably, the two layers of metallized film are misaligned by 1mm in the width direction.

The margin thickening area 6 on one capacitor plate and the base film margin area 2 on the other capacitor plate are arranged at the same end in a staggered mode.

The metal coating series connection conductive thickened area 5 on one capacitor plate and the base film blank area 3 on the other capacitor plate are arranged correspondingly.

In this embodiment, adopt self-healing metallized film is as the bipolar plate of electric capacity, and two self-healing metallized films adopt the mode that the wrong limit set up on the width direction, and the base film on margin thickened area 6 and the another polar plate on the margin thickened area 2 is corresponding, the metal coating series connection on a capacitance polar plate electrically conducts thickened area 5 and the base film blank area 3 on another capacitance polar plate and corresponds the setting each other, can form the condenser of three inside series connection between two self-healing metallized films like this, first condenser 7 in figure 2, second condenser 8 and third condenser 9 promptly, in figure 2, the direction that the arrow point indicates, for the trend of electric current between the capacitance polar plate, the upper and lower bipolar plate of first condenser 7, second condenser 8 and third condenser 9 forms by metal coating leveling zone 4.

The two ends of the capacitor plate in fig. 2 are both edge-reserving thickened areas 6, the edge-reserving thickened areas 6 are two electrodes of the capacitor, and the edge-reserving thickened areas 6 reduce the resistance of the electrodes and reduce the heat productivity.

As an implementation manner in this embodiment, the current may flow into the first capacitor 7 from the margin thickening region 6, the current in the first capacitor 7 flows into the second capacitor 8 through the metal-plated series conductive thickening region 5, the current in the second capacitor 8 flows into the third capacitor 9 through the metal-plated series conductive thickening region 5 again, and finally, the current flows out from the margin thickening region 6 at the other end. The metal plating layer is connected with the conductive thickened area 5 in series to connect the first capacitor 7, the second capacitor 8 and the third capacitor 9 in series, so that the withstand voltage value of the capacitors is increased.

The rated voltage of the capacitor is 10kV, the rated capacitance value is 500 muF, the energy storage density is 1J/cc, the discharge current amplitude is 17.5kA, and the service life of the capacitor is 40200 times of dischargeable times when the capacitance value is reduced by 3.7 percent of the total capacitance value.

The invention discloses an internal series self-healing metallized film, which is internally connected in series by utilizing a metal coating, wherein the metal coating in a series conductive area is thickened, and the metal coating is connected with the conductive thickened area in series to reduce the resistance of a series conductive area in the film, reduce the heating of a capacitor, reduce the resistance and loss and prolong the service life; the widened margin area and the blank area increase the size of the margin area and the blank area, ensure the insulation distance, reduce the probability of breakdown between films, increase the reliability of the capacitor and prolong the service life of the metallized film.

The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.