CN112670084A - Safe explosion-proof type metallized film - Google Patents
Safe explosion-proof type metallized film Download PDFInfo
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- CN112670084A CN112670084A CN202011309217.2A CN202011309217A CN112670084A CN 112670084 A CN112670084 A CN 112670084A CN 202011309217 A CN202011309217 A CN 202011309217A CN 112670084 A CN112670084 A CN 112670084A
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Abstract
The invention provides a safe explosion-proof metallized film, which comprises a BOPP film subjected to corona treatment, a metal layer, a thickening layer and a high temperature resistant layer, wherein the BOPP film, the metal layer, the thickening layer and the high temperature resistant layer are sequentially arranged from bottom to top; one end of the BOPP film is provided with a blank margin without metal evaporation; the metal layer comprises a full-metallization area and a grid-shaped metallization area, and the grid-shaped metallization area is arranged between the blank margin and the full-metallization area; and the thickened layer is evaporated in vacuum at one end of the fully metalized area, which is far away from the blank margin. According to the invention, the high-current resistance, the temperature resistance and the self-healing capability of the metalized film are improved, the reliability, the safety and the quality of the capacitor are improved, the service life of the capacitor is prolonged, and the capacitor is prevented from being failed and exploded due to continuous self-healing breakdown, local BOPP film softening and hot melting.
Description
Technical Field
The invention belongs to the field of capacitors, and relates to a safe explosion-proof metallized film.
Background
The metallized film capacitor is a capacitor made by winding an organic plastic film as a dielectric and a metallized film as an electrode (except for a laminated structure), and films used for the metallized film capacitor include polyethylene, polypropylene, polycarbonate, and the like, and a laminated type is used in addition to a wound type. The metallized film capacitor has high withstand voltage, high insulation resistance, good impedance frequency characteristics (small parasitic inductance), low ESR, high capacity stability and low loss tangent.
The safety explosion-proof metallized film is one of the metallized films, and is generally used for manufacturing metallized self-healing capacitors. The greatest advantage of the safe explosion-proof metallized film is the self-healing characteristic. The self-healing characteristic is that if the film medium has a defect at a certain point and has a breakdown short circuit under the action of overvoltage, the metallized layer of the breakdown point can be instantly melted and evaporated under the action of electric arc to form a small metal-free area, so that two pole pieces of the capacitor are insulated from each other again and can still work, thereby greatly improving the working reliability of the capacitor. However, some existing metallized films often cannot be self-healed successfully under many conditions, multilayer media adjacent to self-healing points are burnt in the self-healing process, continuous self-healing breakdown occurs, and self-healing sound is continuous; under the high-temperature action of electric arcs generated by continuous breakdown, local organic medium films are softened, a hot melting phenomenon is generated, multiple layers of media are bonded together, a large amount of gas is generated along with the bonding, the capacitor fails, explosion and fire can occur in serious conditions, the reliability and safety of the capacitor cannot be well guaranteed, and the service life of the capacitor is short.
Disclosure of Invention
The invention provides a safe explosion-proof metallized film aiming at the problems in the prior art.
The invention solves the technical problems through the following technical means:
a safe explosion-proof metallized film comprises a BOPP film subjected to corona treatment, a metal layer, a thickening layer and a high temperature resistant layer which are sequentially arranged from bottom to top; one end of the BOPP film is provided with a blank margin without metal evaporation; the metal layer comprises a full-metallization area and a grid-shaped metallization area, and the grid-shaped metallization area is arranged between the blank margin and the full-metallization area; and the thickened layer is evaporated in vacuum at one end of the fully metalized area, which is far away from the blank margin.
Further, the high temperature resistant layer is polyurethane.
Further, the grid-shaped metalized area comprises a plurality of uniformly arranged pole plate units, a flame-retardant insulating layer and fuses for connecting adjacent pole plate units.
Further, the pole plate unit is rectangular or rhombus.
Further, the flame-retardant insulating layer comprises the following raw materials in parts by mass: 8-12 parts of a flame retardant, 1-3 parts of an ultraviolet absorber and 10-18 parts of epoxy resin.
Further, the raw materials of the plate unit and the fuse are metal or metal alloy with small corona deterioration.
Further, the raw material of the thickening layer is a metal alloy with low corona deterioration.
The invention has the beneficial effects that: according to the invention, the high-current resistance, the temperature resistance and the self-healing capability of the metalized film are improved, the reliability, the safety and the quality of the capacitor are improved, the service life of the capacitor is prolonged, and the capacitor is prevented from being failed and exploded due to continuous self-healing breakdown, local BOPP film softening and hot melting.
Drawings
FIG. 1 is a schematic structural diagram of a metallized film according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a grid-shaped metalized region according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, a safe explosion-proof metallized film comprises a BOPP film 1 subjected to corona treatment, a metal layer 2, a thickening layer 3 and a high temperature resistant layer 4 which are arranged from bottom to top in sequence; one end of the BOPP film 1 is provided with a blank margin 11 without metal evaporation; the metal layer 2 comprises a full-metallization area 21 and a grid-shaped metallization area 22, and the grid-shaped metallization area 22 is arranged between the blank margin 11 and the full-metallization area 21; the thickening layer 3 is vacuum evaporated on the fully metallized region 21 at the end remote from the blank margin 11.
The BOPP film has the characteristics of heat resistance, chemical corrosion resistance, light weight, no toxicity, high tensile strength, high impact strength, high toughness, excellent insulating property and the like, but the BOPP high polymer does not contain polar groups, has stable chemical properties and low surface tension, so the BOPP high polymer needs to be subjected to surface treatment in advance before use. The corona treatment of the BOPP film is to utilize high-frequency high-voltage to carry out corona discharge on the surface of the treated BOPP film (the high-frequency alternating current voltage reaches 5000-, softening the local BOPP film, generating hot melting phenomenon, and causing the capacitor failure and explosion.
High temperature resistant layer 4 is polyurethane, and polyurethane has and excels in with substrate adhesive property, resistant radius, temperature resistance can well and the leakproofness is good etc. characteristic to increase the fastness between each cladding material, increase the antioxidant capacity of metal level 2 and thickening layer 3, prevent metal level 2 and thickening layer 3 oxidation, improve the temperature resistance and the self-healing performance of metallized film and condenser avoid burning the adjacent multilayer medium of self-healing point, take place continuity self-healing and puncture, and local BOPP film softens, takes place the hot melt phenomenon, causes the condenser inefficacy and explosion, and then prolongs the life of metallized film and condenser.
As shown in fig. 2, the grid-shaped metalized region 22 includes a plurality of plate units 23 which are uniformly arranged, a flame-retardant insulating layer 24, and fuses 25 connecting the adjacent plate units 23. The fuse 25 is used as an explosion-proof structure and has safe explosion-proof performance, when a metalized film has defects at a certain point and has breakdown short circuit under the action of overvoltage, the pole plate unit 23 in the breakdown point range can be instantly melted and evaporated under the action of electric arc to form a very small metal-free area, the fuse 25 in the breakdown point range is fused and disconnected with the pole plate units 23 around the fuse, the change of capacitance is very small, and two pole pieces of the capacitor are insulated again and can still work, so that the working reliability of the capacitor is greatly improved; simultaneously, when appearing the heavy current breakdown in certain polar plate unit 23 and burn, because the separation effect of fire-retardant insulating layer 24, the heat that the electric current breakdown was given off can not puncture fire-retardant insulating layer 24 and arouse the further burn of polar plate unit 23 on every side, prevents effectively that a plurality of polar plate units 23 from puncturing simultaneously, can effectively be explosion-proof, improves the insulating nature and the stability of electric property, temperature resistance and the corrosion resisting capability of metallized film prevent the metallized film takes place continuity self-healing breakdown, and then improves the security and the reliability of metallized film and capacitor work prolong its life.
The plate unit 23 can be rectangular or rhombus, the raw materials of the plate unit 23 and the fuse 25 are metal or metal alloy with small corona deterioration, such as aluminum, zinc or zinc-aluminum alloy, so that the self-healing performance of the metalized film is improved, and the working reliability of the capacitor is improved.
The thickening layer 3 is made of metal alloy with small corona deterioration, such as zinc-aluminum alloy. The zinc-aluminum alloy has good heat resistance and can bear the high temperature of more than 300 ℃; the weather resistance is excellent, the paint can adapt to various environments, and the application range is wide; strong corrosion resistance, mainly due to the protective function of aluminum; the electric conductivity is good, the corona deterioration is small, so that the heavy current resistance of the metalized film is improved, and the service life of the metalized film is prolonged.
The flame-retardant insulating layer 24 comprises the following raw materials in parts by mass: 8-12 parts of a flame retardant, 1-3 parts of an ultraviolet absorber and 10-18 parts of epoxy resin, wherein the flame retardant and the ultraviolet absorber enable the flame-retardant insulating layer 24 not to be easily ignited, improve the stability, temperature resistance and corrosion resistance of the insulation and electrical properties of the metallized film, and prevent the metallized film from continuous self-healing breakdown, local BOPP film softening and hot melting; the epoxy resin imparts excellent flexibility and high viscosity to the flame-retardant insulating layer 24.
According to the invention, the high-current resistance, the temperature resistance and the self-healing capability of the metalized film are improved, the reliability, the safety and the quality of the capacitor are improved, the service life of the capacitor is prolonged, and the capacitor is prevented from being failed and exploded due to continuous self-healing breakdown, local BOPP film softening and hot melting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A safe explosion-proof type metallized film which is characterized in that: the metallized film comprises a BOPP film (1) which is subjected to corona treatment, a metal layer (2), a thickening layer (3) and a high temperature resistant layer (4) which are sequentially arranged from bottom to top; one end of the BOPP film (1) is provided with a blank margin (11) without metal evaporation; the metal layer (2) comprises a fully metallized region (21) and a grid-shaped metallized region (22), and the grid-shaped metallized region (22) is arranged between the blank margin (11) and the fully metallized region (21); and the thickening layer (3) is vacuum-evaporated at one end of the fully metalized area (21) far away from the blank margin (11).
2. A safety explosion-proof metallized film as claimed in claim 1, wherein: the grid-shaped metalized area (22) comprises a plurality of uniformly arranged pole plate units (23), a flame-retardant insulating layer (24) and fuses (25) for connecting the adjacent pole plate units (23).
3. A safety explosion-proof metallized film as claimed in claim 2, wherein: the pole plate unit (23) is rectangular or rhombic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309217.2A CN112670084A (en) | 2020-11-20 | 2020-11-20 | Safe explosion-proof type metallized film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309217.2A CN112670084A (en) | 2020-11-20 | 2020-11-20 | Safe explosion-proof type metallized film |
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| CN112670084A true CN112670084A (en) | 2021-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011309217.2A Withdrawn CN112670084A (en) | 2020-11-20 | 2020-11-20 | Safe explosion-proof type metallized film |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202678109U (en) * | 2012-07-16 | 2013-01-16 | 佛山市意壳电容器有限公司 | High square resistance metallization polymer film capacitor |
| CN103834103A (en) * | 2014-03-04 | 2014-06-04 | 芜湖市艾德森自动化设备有限公司 | Self-healing capacity modified isotatic polypropylene capacitor metalized film and preparation method thereof |
| CN205789506U (en) * | 2016-07-04 | 2016-12-07 | 南通百正电子新材料股份有限公司 | A kind of ultra-thin high-temperature-respolypropylene polypropylene capacitor metallized film |
| CN108597871A (en) * | 2018-04-18 | 2018-09-28 | 钱立文 | A kind of safety diaphragm of composite construction |
-
2020
- 2020-11-20 CN CN202011309217.2A patent/CN112670084A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202678109U (en) * | 2012-07-16 | 2013-01-16 | 佛山市意壳电容器有限公司 | High square resistance metallization polymer film capacitor |
| CN103834103A (en) * | 2014-03-04 | 2014-06-04 | 芜湖市艾德森自动化设备有限公司 | Self-healing capacity modified isotatic polypropylene capacitor metalized film and preparation method thereof |
| CN205789506U (en) * | 2016-07-04 | 2016-12-07 | 南通百正电子新材料股份有限公司 | A kind of ultra-thin high-temperature-respolypropylene polypropylene capacitor metallized film |
| CN108597871A (en) * | 2018-04-18 | 2018-09-28 | 钱立文 | A kind of safety diaphragm of composite construction |
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Application publication date: 20210416 |