CN108597870B - Dampproof film capacitor and preparation method thereof - Google Patents
Dampproof film capacitor and preparation method thereof Download PDFInfo
- Publication number
- CN108597870B CN108597870B CN201810522879.4A CN201810522879A CN108597870B CN 108597870 B CN108597870 B CN 108597870B CN 201810522879 A CN201810522879 A CN 201810522879A CN 108597870 B CN108597870 B CN 108597870B
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- metal layer
- film
- low
- resistance layer
- film roll
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- 239000003990 capacitor Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 239000010408 film Substances 0.000 claims abstract description 87
- 239000002184 metal Substances 0.000 claims abstract description 80
- 229910052751 metal Inorganic materials 0.000 claims abstract description 80
- 239000011104 metalized film Substances 0.000 claims abstract description 36
- 238000007731 hot pressing Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/003—Apparatus or processes for encapsulating capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/224—Housing; Encapsulation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention belongs to the technical field of metallized film capacitors, and particularly relates to a moistureproof film capacitor and a preparation method thereof. According to the moistureproof film capacitor, the low-sheet-resistance metal layer is added on the metallized films, and when two metallized films are wound to form a film roll, the low-sheet-resistance metal layer cannot form a serial structure, so that the influence on other characteristics of the capacitor is avoided. The low sheet resistance layer has the advantage of reducing the probability of generating corona effect, thereby reducing the risk of generating corona effect and effectively reducing the speed of corona diffusion. Therefore, the low sheet resistance layer plays a role in blocking moisture, simultaneously reduces the transmission rate of the moisture and ensures the service life of the capacitor.
Description
Technical Field
The invention belongs to the technical field of metallized film capacitors, and particularly relates to a moistureproof film capacitor and a preparation method thereof.
Background
After the capacitor is assembled, the film roll is completely covered by epoxy resin, and the external flame-retardant shell can play a role in moisture resistance. However, the existing capacitor works under the conditions of high temperature and high humidity, moisture can enter the shell, so that the moisture is immersed into the capacitor core and generates corona effect, and the corona effect continuously occurs along with the working of the capacitor, so that the capacity of the capacitor is finally attenuated, and the service life is seriously influenced.
Disclosure of Invention
The invention aims at: in view of the above-mentioned problems, a moisture-proof film capacitor is provided which can operate under high temperature and high humidity conditions, and in which moisture is difficult to penetrate into the inside of the capacitor core, maintaining the normal life of the capacitor.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention discloses a moistureproof film capacitor, which comprises a film roll, a lead wire and a shell for protecting the film roll; the film roll is provided with a first end face and a second end face which is opposite to the first end face along the axis direction; the film roll is provided with a first disc metal layer positioned on the first end face and a second disc metal layer positioned on the second end face; the two leads are arranged, one end of one lead is arranged on the shell and is electrically connected with the first disc metal layer, and one end of the other lead is arranged on the shell and is electrically connected with the second disc metal layer; the film roll includes a first metallized film and a second metallized film; the first metallized film is provided with a first insulating film, a first metal layer and a first low-sheet-resistance layer; the first insulating film has a first surface and a second surface disposed opposite to the first surface; the first metal layer and the first low sheet resistance layer are both arranged on the first surface, and a preset interval is reserved between the first low sheet resistance layer and the first metal layer; the first low sheet resistance layer is close to the second end face, and the first metal layer is electrically connected with the first disc metal layer; the second metallized film is provided with a second insulating film, a second metal layer and a second low sheet resistance layer; the second insulating film has a third surface and a fourth surface disposed opposite to the third surface; the second metal layer and the second low sheet resistance layer are both arranged on the third surface, and a preset interval is reserved between the second low sheet resistance layer and the second metal layer; the second low sheet resistance layer is close to the first end face, and the second metal layer is electrically connected with the second disc metal layer; the film roll is formed by stacking and winding the first metallized film and the second metallized film in a staggered manner, the first low-sheet-resistance layer can be attached to the fourth surface, and the second low-sheet-resistance layer can be attached to the second surface;
the material components of the first low-sheet-resistance layer and the material components of the second low-sheet-resistance layer both comprise zinc and aluminum.
Further, the width of the first low sheet resistance layer and the width of the second low sheet resistance layer are 1-1.5mm; and the resistance of the first low-square-resistance layer and the resistance of the second low-square-resistance layer are 1.225-2.275 omega/≡.
The invention also provides a preparation method of the moistureproof film capacitor, which comprises the following steps:
s1), stacking the first metallized film and the second metallized film in a staggered manner and winding to form the film roll;
s2) hot-pressing the film roll, wherein the hot-pressing temperature is 90-105 ℃, and the hot-pressing time is 450-900S; carrying out heat treatment on the film roll subjected to hot pressing, wherein the heat treatment temperature is 110 ℃, and the heat treatment time is 4.5 hours; naturally cooling the film roll subjected to heat treatment to normal temperature;
s3) respectively spraying metal on the first end face and the second end face of the film roll obtained after the treatment in the step S2), so that the first end face forms a first disc metal layer, and the second end face forms a second disc metal layer;
s4), deburring the first disc metal layer and the second disc metal layer of the film roll obtained after the treatment in the step S3), and respectively welding one lead wire on the first disc metal layer and the second disc metal layer of the film roll;
s5), assembling the film roll into an epoxy shell, encapsulating epoxy resin, and then curing to obtain a finished product.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the working state of the existing capacitor under the high-temperature and high-humidity environment is studied, and the phenomenon that gaps are generated among different materials under the high-temperature environment due to the fact that the different materials have different shrinkage rates is found, and in the capacitor, particularly between a metal outgoing line and an epoxy resin pouring material, more moisture can infiltrate into the inside of a capacitor core from the gaps, and corona effect initially occurs in the edge area of high sheet resistance. According to the moistureproof film capacitor, the low-sheet-resistance metal layer is added on the metallized films, and when two metallized films are wound to form a film roll, the low-sheet-resistance metal layer cannot form a serial structure, so that the influence on other characteristics of the capacitor is avoided. The low sheet resistance layer has the following two functions that (1) the edge of the metallized film is added with the low sheet resistance layer, the thickness of the plating layer is thicker, which is equivalent to thicker metal on both sides of the same medium, after heat setting, the edge position setting consistency is good, the gap between two metallized films is small, and the probability of generating corona effect is reduced, thereby reducing the risk of generating corona effect; (2) the low sheet resistance layer is thicker in coating, and can not cause two capacitors to be connected in series with the metal layer on site, so that the nominal capacity is reduced, the effective area of the capacitors is not increased, the nominal capacity is increased, and meanwhile, the corona diffusion speed can be effectively reduced. Therefore, the low sheet resistance layer plays a role in blocking moisture, simultaneously reduces the transmission rate of the moisture and ensures the service life of the capacitor.
Drawings
FIG. 1 is a schematic view of the structure of a moisture-proof film capacitor of the present invention;
FIG. 2 is a cross-sectional view of A-A of the moisture resistant film capacitor of the present invention;
FIG. 3 is a misalignment overlay of a first metallized film and a second metallized film of the present invention;
FIG. 4 is a flow chart of a method of making a moisture resistant film capacitor of the present invention;
reference numerals:
10-shell, 11-lead, 12-first metallized film, 120-first insulating film, 1200-first side, 121-first metal layer, 122-first low sheet resistance layer, 13-second metallized film, 130-second insulating film, 1300-third side, 131-second metal layer, 132-second low sheet resistance layer, 14-film roll, 140-first disc metal layer, 141-second disc metal layer.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
As shown in fig. 1 to 3, the present invention provides a moisture-proof film capacitor comprising a film roll 14, a lead 11, and a case 10 for protecting the film roll 14; the housing 10 is an epoxy resin housing, and has a rectangular annular shape; the film roll 14 has a first end face and a second end face disposed opposite to the first end face in the axial direction thereof; the film roll 14 is provided with a first disc metal layer 140 at the first end face and a second disc metal layer 141 at the second end face; the number of the leads 11 is two, wherein one end of one lead 11 is disposed on the housing 10 and is electrically connected to the first disc metal layer 140, and one end of the other lead 11 is disposed on the housing 10 and is electrically connected to the second disc metal layer 141; the film roll 14 comprises a first metallized film 12 and a second metallized film 13; the first metallization film 12 has a first insulating film 120, a first metal layer 121, and a first low sheet resistance layer 122; the first insulating film 120 has a first surface 1200 and a second surface disposed opposite to the first surface 1200; the first metal layer 121 and the first low-sheet-resistance layer 122 are both disposed on the first surface 1200, and a predetermined space is provided between the first low-sheet-resistance layer 122 and the first metal layer 121, that is, the first low-sheet-resistance layer 122 is not connected with the first metal layer 121; the first low sheet resistance layer 122 is close to the second end surface, and the first metal layer 121 is electrically connected to the first disc metal layer 140; the second metallization film 13 has a second insulating film 130, a second metal layer 131, and a second low sheet resistance layer 132; the second insulating film 130 has a third surface 1300 and a fourth surface disposed opposite to the third surface 1300; the second metal layer 131 and the second low-sheet-resistance layer 132 are both disposed on the third surface 1300, and a predetermined space is provided between the second low-sheet-resistance layer 132 and the second metal layer 131, that is, the second low-sheet-resistance layer 132 is not connected with the second metal layer 131; the second low sheet resistance layer 132 is close to the first end surface, and the second metal layer 131 is electrically connected to the second disc metal layer 141; the film roll 14 is formed by stacking and winding the first metallized film 12 and the second metallized film 13 in a staggered manner, as shown in fig. 3, and winding the film roll 14 along the length direction of the first low sheet resistance layer 122 or the length direction of the second low sheet resistance layer 132, so that the wound film roll 14 is cylindrical, the first low sheet resistance layer 122 and the second low sheet resistance layer 132 are both spirally extended outwards, the first low sheet resistance layer 122 can be attached to the fourth surface, and the second low sheet resistance layer 132 can be attached to the second surface. The materials of the first insulating film 120 and the second insulating film 130 are polyester films.
The material composition of the first low sheet resistance layer 122 and the material composition of the second low sheet resistance layer 132 both include zinc and aluminum. The film roll 14 can chemically react with moisture to remove the moisture.
The width of the first low-sheet-resistance layer 122 and the width of the second low-sheet-resistance layer 132 are both 1-1.5mm; the resistance of the first low-square-resistance layer 122 and the resistance of the second low-square-resistance layer 132 are both 1.225-2.275 Ω/≡, for example, the resistance may be 1.75 Ω/≡. When placed as in fig. 3, the height of the first low sheet resistance layer 122 is identical to the height of the highest position of the first metal layer 121, and the height of the second low sheet resistance layer 132 is identical to the height of the highest position of the second metal layer 131.
The preparation method of the moistureproof film capacitor in the embodiment is as follows:
s1) depositing a first metal layer 121 and a first low-sheet-resistance layer 122 on the first insulating film 120 to obtain a first metallized film 12, and depositing a second metal layer 131 and a second low-sheet-resistance layer 132 on the second insulating film 130 to obtain a second metallized film 13; the first metallized film 12 and the second metallized film 13 are stacked in a staggered manner and wound to form the film roll 14;
s2), hot-pressing the film roll 14 at the hot-pressing temperature of 90-105 ℃ for 450-900S; heat-treating the film roll 14 subjected to hot pressing at 110 ℃ for 4.5 hours; naturally cooling the film roll 14 subjected to heat treatment to normal temperature, fully eliminating the stress after hot pressing, and slowly cooling to ensure that the shape is stable; the first end face and the second end face of the naturally cooled film roll 14 are then masked, i.e. shielded, to avoid dust from the production plant adhering to either the first end face or the second end face.
S3), respectively spraying metal on the first end face and the second end face of the film roll 14 obtained after the treatment in the step S2), so that the first end face forms a first disc metal layer 140, and the second end face forms a second disc metal layer 141;
s4), deburring the first disc metal layer 140 and the second disc metal layer 141 of the film roll 14 obtained through the treatment in the step S3), and respectively welding one lead 11 on the first disc metal layer 140 and the second disc metal layer 141 of the film roll 14; the lead 11 is made of tin-plated copper-clad steel;
s5), the film roll 14 is assembled into an epoxy shell, epoxy resin is filled and poured, and then the film roll is solidified to obtain a finished product. The epoxy resin is FC-500A-2/FC-500B-2 produced by Dongguan Fu electronic technology Co., ltd;
s6), performing external inspection, sorting, batch-by-batch inspection and packaging on the finished product to obtain a sales product.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (3)
1. A moisture-proof film capacitor, comprising a film roll, a lead wire and a shell for protecting the film roll; the film roll is provided with a first end face and a second end face which is opposite to the first end face along the axis direction; the film roll is provided with a first disc metal layer positioned on the first end face and a second disc metal layer positioned on the second end face; the two leads are arranged, one end of one lead is arranged on the shell and is electrically connected with the first disc metal layer, and one end of the other lead is arranged on the shell and is electrically connected with the second disc metal layer; the film roll includes a first metallized film and a second metallized film; the first metallized film is provided with a first insulating film, a first metal layer and a first low-sheet-resistance layer; the first insulating film has a first surface and a second surface disposed opposite to the first surface; the first metal layer and the first low sheet resistance layer are both arranged on the first surface, and a preset interval is reserved between the first low sheet resistance layer and the first metal layer; the first low sheet resistance layer is close to the second end face, and the first metal layer is electrically connected with the first disc metal layer; the second metallized film is provided with a second insulating film, a second metal layer and a second low sheet resistance layer; the second insulating film has a third surface and a fourth surface disposed opposite to the third surface; the second metal layer and the second low sheet resistance layer are both arranged on the third surface, and a preset interval is reserved between the second low sheet resistance layer and the second metal layer; the second low sheet resistance layer is close to the first end face, and the second metal layer is electrically connected with the second disc metal layer; the film roll is formed by stacking and winding the first metallized film and the second metallized film in a staggered manner, the first low-sheet-resistance layer can be attached to the fourth surface, and the second low-sheet-resistance layer can be attached to the second surface;
the material components of the first low-sheet-resistance layer and the material components of the second low-sheet-resistance layer both comprise zinc and aluminum.
2. The moisture-resistant film capacitor of claim 1, wherein the width of said first low sheet resistance layer and the width of said second low sheet resistance layer are each 1-1.5mm; and the resistance of the first low-square-resistance layer and the resistance of the second low-square-resistance layer are 1.225-2.275 omega/≡.
3. A method of manufacturing a moisture-proof film capacitor as claimed in claim 1 or 2, comprising the steps of:
s1), stacking the first metallized film and the second metallized film in a staggered manner and winding to form the film roll;
s2) hot-pressing the film roll, wherein the hot-pressing temperature is 90-105 ℃, and the hot-pressing time is 450-900S; carrying out heat treatment on the film roll subjected to hot pressing, wherein the heat treatment temperature is 110 ℃, and the heat treatment time is 4.5 hours; naturally cooling the film roll subjected to heat treatment to normal temperature;
s3) respectively spraying metal on the first end face and the second end face of the film roll obtained after the treatment in the step S2), so that the first end face forms a first disc metal layer, and the second end face forms a second disc metal layer;
s4), deburring the first disc metal layer and the second disc metal layer of the film roll obtained after the treatment in the step S3), and respectively welding one lead wire on the first disc metal layer and the second disc metal layer of the film roll;
s5), assembling the film roll into an epoxy shell, encapsulating epoxy resin, and then curing to obtain a finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810522879.4A CN108597870B (en) | 2018-05-28 | 2018-05-28 | Dampproof film capacitor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810522879.4A CN108597870B (en) | 2018-05-28 | 2018-05-28 | Dampproof film capacitor and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108597870A CN108597870A (en) | 2018-09-28 |
| CN108597870B true CN108597870B (en) | 2024-03-08 |
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| CN201810522879.4A Active CN108597870B (en) | 2018-05-28 | 2018-05-28 | Dampproof film capacitor and preparation method thereof |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111863446B (en) * | 2020-08-16 | 2021-11-26 | 南通新江海动力电子有限公司 | Metallized film for slowing down capacitance capacity loss in humid environment |
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| CN108597870A (en) | 2018-09-28 |
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