CN115863056A - High-voltage large-current pulse energy storage capacitor and manufacturing method thereof - Google Patents

Abstract

The invention provides a high-voltage large-current pulse energy storage capacitor and a manufacturing method thereof, and relates to the technical field of capacitors. The invention adopts a structure of first connecting in series and then connecting in parallel, the series groups can obtain enough high voltage resistant insulation distance, and the insulating sleeves outside the series groups can prevent the situations of creepage, electric leakage, point discharge and the like among different series groups.

Description

High-voltage large-current pulse energy storage capacitor and manufacturing method thereof

Technical Field

The invention relates to the technical field of capacitors, in particular to a high-voltage high-current pulse energy storage capacitor and a manufacturing method thereof.

Background

The core component of the device with high voltage, high impact current, high energy storage and rapid charge and discharge is a high-voltage pulse energy storage capacitor bank. The capacitor bank needs to withstand several kV to dozens of kV, the repeatable impact current needs to reach dozens of kA, the capacitance is hundreds of muF, the energy storage needs to reach tens of thousands of J, and the service life needs to reach tens of thousands of charging and discharging.

Such a capacitor bank is generally implemented by connecting a plurality of capacitors in series and parallel. For example, a certain type of metal tube welding machine needs a capacitor bank with the withstand voltage of 27kVDC, the capacitance of about 180 muF and the withstand voltage of 40kA, and can be realized by adopting a single 1100VDC-500 muF direct current support metalized film capacitor with the size of phi 86 multiplied by 175 and 24 strings of 9 and 216 capacitors. Although the combined mode can meet the electrical performance requirement, the capacitor bank is large in space occupation and inconvenient to install.

Large DC support or DC pulse capacitors can also be customized, such as capacitors rated at 4-5 kV and having capacitance of thousands of μ F. To obtain a capacitor bank with tens of thousands of volts of rated voltage, a plurality of capacitors can be connected in series, but the repeatable current index of dozens of kA is difficult to achieve, and the use times of the capacitor bank is difficult to guarantee.

Disclosure of Invention

The capacitor bank is composed of a plurality of core elements with the same specification, a structure of connecting in series and then connecting in parallel is adopted, the series groups can obtain enough high-voltage-resistant insulation distance, and the insulating sleeves outside the series groups can prevent the situations of creepage, electric leakage, point discharge and the like among different series groups; by adopting the three-inner-string structure, when the core elements are manufactured in large batch, the actual capacitance deviation of each core element can be controlled within +/-2 percent or even +/-1 percent, and when high-voltage division is carried out, the voltage born by each core element is basically consistent, so that the breakdown failure probability is reduced.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a high-voltage large-current pulse energy storage capacitor, includes capacitor bank, shell, draws copper bar, insulation board and insulating package material and resin filling material, the capacitor bank comprises the core component of many same specifications, and several the core component is established ties into series connection group, the outside of series connection group is provided with bushing, and is many the terminal surface of series connection group homopolarity is in the coplanar, and the terminal surface of different polarities keeps being greater than the position of electrical insulation distance and arranges, be connected through stranded copper strand soldering between core component terminal surface and the copper bar of drawing.

Preferably, the core element is a cylinder formed by winding two layers of metalized polypropylene films by taking a hollow core rod as a shaft, and metal layers for leading out electrodes are sprayed on two ends of the cylinder. The core element 11 is a thin film capacitor, and the manufacturing method of the thin film capacitor comprises the following steps: evaporating a metal layer on one side of the polypropylene film to form a metallized polypropylene film 21; the two layers of metallized polypropylene films are respectively used as a positive electrode and a negative electrode and wound on a plastic hollow core rod, and the length of the core rod is about 5mm wider than that of the metallized polypropylene film. During winding, the two layers of metallized polypropylene films are respectively close to two ends of the plastic hollow core rod, so that the positive and negative electrode films can be staggered by about 5mm, and the electrodes can be conveniently led out. After the metal powder is wound into a cylinder, the metal powder is respectively sprayed on two ends of the cylinder to be used as electrodes to be led out.

Preferably, the metallized polypropylene film is sequentially provided with a polypropylene light film, an aluminum metallized layer and a zinc thickening layer from bottom to top.

Preferably, the two layers of metallized polypropylene films have the same thickness and the width of the metallized polypropylene film is L, and the edge thickening zinc-aluminum composite area of the upper layer of metallized polypropylene film is arranged corresponding to the edge screen area of the lower layer of metallized polypropylene film.

Preferably, the metallized polypropylene film is provided with a zinc-aluminum composite zone with thickened edge, an aluminum active zone I, a middle screen zone, an aluminum active zone II, a middle zinc-aluminum composite zone with thickened edge, an aluminum active zone III and an edge screen zone in sequence along the film width direction, and the edge of the zinc-aluminum composite zone with thickened edge is a wavy edge along the film length direction.

Preferably, the metallized polypropylene film has a film width L of 145-155mm, a metallized layer overlapping region width L1 of 43.45-43.55mm, a misalignment edge L2 of 1.4-1.6mm, an edge screen region width L3 of 4.5-5.5mm, a middle screen region width L4 of 3.5-4.5mm, a wave edge wavelength of 2.45-2.55mm, a peak-to-peak amplitude of 0.25-0.4mm, and a wave edge length increased by more than 3% compared with a straight cut.

Preferably, the square resistance of the edge thickening zinc-aluminum composite area and the middle thickening zinc-aluminum composite area is 2-4 omega/\9633, and the square resistance of the aluminum active area is 40-55 omega/\9633. Omega/\ 9633which is a unit of sheet resistance and represents a resistance value per unit area, is generally used for representing the conductivity of a metal plating of a metallized film, and the thicker the plating, the smaller the sheet resistance.

Preferably, the two layers of metallized polypropylene films have the same thickness and the film width is L, the edge thickening zinc-aluminum composite region of the upper layer of the metallized polypropylene film corresponds to the edge screen region of the lower layer of the metallized polypropylene film, the distance of the edge thickening zinc-aluminum composite region is L2, the width of the edge screen region is L3, the width of the middle screen region 43 is L4, the number of the overlapped regions of the upper and lower layers of the metallized polypropylene film is three, and the widths of the overlapped regions are L1.

A manufacturing method of a high-voltage large-current pulse energy storage capacitor comprises the following steps:

1) Vacuum coating: placing the polypropylene optical film roll to be evaporated in a vacuum degree of 2 multiplied by 10 ^-4 Starting a film releasing system in a mbar vacuum film plating machine, firstly spraying shielding oil on a metal-free area planned on the surface of an optical film, then sequentially carrying out physical vapor deposition on metal aluminum vapor and zinc vapor to an area specified on the surface of the optical film, and rolling the plated metallized polypropylene film;

2) Aging: the metallized polypropylene film roll after evaporation is kept still for more than 12 hours in the aging time of the temperature of 25 +/-5 ℃ and the humidity of less than or equal to 35% RH;

3) Cutting a film: the metallized polypropylene film is rolled and cut into required specifications, the edge thickening zinc-aluminum composite area is centrally cut by a wave cutter to obtain a wave edge, and the edge screen belt is centrally cut by a straight cutter;

4) Winding: taking the hollow core rod as an axis, and winding the two layers of metallized polypropylene films;

5) Spraying gold: spraying zinc, zinc-tin alloy, zinc-aluminum alloy and the like on two end surfaces of the core element to lead out electrodes;

6) Vacuum polymerization: placing the core element in a vacuum tank with the vacuum degree of about 1pa, heating to 105 +/-5 ℃, and keeping for more than 20 hours;

7) Testing the heart: measuring parameters such as pressure resistance, capacity and loss angle tangent of the core element, and removing unqualified products;

8) Dipping: impregnating the core element with methyl silicone oil at the temperature of 60 +/-5 ℃ for more than 12 hours;

9) And the serial group welding: using the copper stranded wires or the copper strips to serially weld a plurality of core elements;

10 A bushing: sleeving an insulating sleeve on the outer sleeve of the series group and performing thermal shrinkage;

11 The capacitor bank is welded: connecting the end surface of the core element with the lead-out copper bar through a plurality of copper stranded wires in a soldering manner to form the capacitor bank;

12 The capacitor bank is wrapped: wrapping the capacitor bank with an insulating wrapper;

13 The capacitor bank test: measuring parameters such as withstand voltage, capacity and loss tangent of the capacitor bank;

14 Perfusion: placing the capacitor bank in a shell, placing an insulating plate, and filling the capacitor bank with an insulating pouring material, wherein the insulating pouring material is polyurethane, epoxy resin or a mixture of the polyurethane and the epoxy resin, the pouring frequency is not less than three times, and the next pouring can be carried out after the insulating pouring material is basically cured every time;

15 Capacitor testing: measuring parameters such as interelectrode withstand voltage, pole shell withstand voltage, insulation resistance, capacity, loss tangent and the like of the capacitor;

16 Identify, pack, and store in storage.

Compared with the prior art, the invention has the advantages and positive effects that,

1. the capacitor bank is composed of a plurality of core elements with the same specification, a plurality of core elements are connected in series to form a series group, an insulating sleeve is arranged outside the series group, the plurality of series groups are regularly and orderly arranged, the end faces with the same polarity are positioned on the same plane, the end faces with different polarities keep enough electrical insulation distance, the end faces of the core elements and the lead-out copper bars are connected by a plurality of strands of copper stranded wires in a soldering way, the core elements are cylinders formed by winding two layers of metalized polypropylene films by taking a hollow core rod as an axis, and the metal layers of the lead-out electrodes are sprayed on the two ends of the core elements; the metallized polypropylene film structure used by the core element sequentially comprises a polypropylene film, an aluminum metallized layer and a zinc thickening layer from bottom to top, the capacitor bank is composed of a plurality of core elements with the same specification, a structure of firstly connecting in series and then connecting in parallel is adopted, the series groups can obtain enough high-voltage-resistant insulation distance, and the insulating sleeves outside the series groups can prevent the situations of creepage, electric leakage, point discharge and the like among different series groups;

2. the metallized polypropylene film is sequentially provided with an edge thickening zinc-aluminum composite area, an aluminum active area, a middle screen area, an aluminum active area, a middle thickening zinc-aluminum composite area, an aluminum active area and an edge screen area along the film width direction, and the edge of the edge thickening zinc-aluminum composite area is a wavy edge along the film length direction; the thicknesses of the two layers of metallized polypropylene films are the same, the edge thickening zinc-aluminum composite region of the upper layer of metallized polypropylene film corresponds to the edge screen region of the lower layer of metallized polypropylene film, the edge thickening zinc-aluminum composite regions are staggered, and the widths of the overlapped regions of the metallized layers of the upper layer of metallized polypropylene film and the lower layer of metallized polypropylene film are the same; the core element manufactured by the structure can be equivalent to three equal-capacitance capacitor elements which are connected in series, is in a three-inner-series structure, adopts the three-inner-series structure, and can control the actual capacitance deviation of each core element within +/-2 percent or even +/-1 percent when the core elements are manufactured in large batch, so that the voltage born by each core element is basically consistent when high-voltage division is carried out, and the breakdown failure probability is reduced.

Drawings

FIG. 1 is a schematic diagram of a capacitor structure according to the present invention;

FIG. 2 is a schematic view of the construction of the core element of the present invention;

FIG. 3 is a schematic view of the structure of the metallized polypropylene of the present invention.

Figure 4 is a side view of a metallized polypropylene structure of the present invention.

Illustration of the drawings:

1. a capacitor component; 2. a housing; 3. leading out copper bars; 4. an insulating plate and an insulating packing material; 5. resin pouring material; 6. copper stranded wire;

11. a core element; 12. a series group; 13. an insulating sleeve; 21. a metallized propylene film; 22. a hollow core rod; 23. a metal layer;

31. a polypropylene film; 32. an aluminum metallization layer; 33. a zinc thickening layer;

41. the edge is thickened with a zinc-aluminum composite area; 42. a first aluminum active area; 43. a middle screen zone; 44. a second aluminum active area; 45. the middle part is thickened with a zinc-aluminum composite area; 46. an aluminum active area III; 47. an edge screen zone.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Example 1

As shown in fig. 1 to 4, the present invention provides a technical solution: a high-voltage large-current pulse energy storage capacitor and a manufacturing method thereof comprise a capacitor bank 1, a shell 2, a lead-out copper bar 3, an insulating plate, an insulating packaging material 4 and a resin pouring material 5, wherein the capacitor bank 1 is composed of a plurality of core elements 11 with the same specification, the core elements 11 are connected in series to form a series group 12, an insulating sleeve 13 is arranged outside the series group 12, the end faces of the series group 12 with the same polarity are positioned on the same plane, the end faces with different polarities are arranged at positions larger than an electric insulation distance, and the end faces of the core elements 11 are connected with the lead-out copper bar 3 through a plurality of copper strands 6 in a soldering mode.

Further, the core element 11 is a cylinder formed by winding two layers of metallized polypropylene films 21 around a hollow core rod 22, and metal layers 23 for leading out electrodes are sprayed on both ends of the cylinder.

Furthermore, the metallized polypropylene film 21 is provided with a polypropylene optical film 31, an aluminum metallized layer 32 and a zinc thickening layer 33 in sequence from bottom to top.

Furthermore, the metallized polypropylene film 21 is sequentially provided with a zinc-aluminum composite area 41 with thickened edge, a first aluminum active area 42, a middle screen area 43, a second aluminum active area 44, a zinc-aluminum composite area 45 with thickened middle, a third aluminum active area 46 and an edge screen area 47 along the film width direction, and the edge of the zinc-aluminum composite area 41 with thickened edge is a wave edge along the film length direction.

Further, the two metalized polypropylene films 21 have the same thickness and the same film width L, the edge-thickened zinc-aluminum composite region 41 of the upper metalized polypropylene film 21 corresponds to the edge screen region 47 of the lower metalized polypropylene film 21, the distance of the outer fault of the edge-thickened zinc-aluminum composite region 41 is L2, the width of the edge screen region 47 is L3, the width of the middle screen region 43 is L4, and the overlapping regions of the metalized layers of the upper and lower metalized polypropylene films 21 are three and the widths are all L1.

Furthermore, the square resistance of the edge thickening zinc-aluminum composite region 41 and the middle thickening zinc-aluminum composite region 45 is 2-4 omega/\9633, and the square resistance of the aluminum active region is 40-55 omega/\9633.

Further, the core elements 11 have a nominal capacitance of 40 μ F, the two core elements 11 are connected in series to form a series group 12, thirty-six series groups 12 are arranged in order according to nine rows and nine columns, the capacitor bank 1 is composed of 72 core elements 11 with the same specification, the thickness of the polypropylene optical film 31 is 4.8 μm, the rated voltage of the capacitor is 8kV, the nominal capacitance is 720 μ F ± 2%, the stored energy is 23040J, the stored energy density is 0.312J/cm3, the repeatable current is 40kA, and the charging and discharging times under rated conditions exceed 40000 times.

Further, when the core element 11 has a nominal capacitance of 20 μ F, four core elements 11 are connected in series to form a series group 12, fifty series groups 12 are arranged regularly according to five rows and ten columns, the capacitor bank 1 is composed of two hundred core elements 11 with the same specification, the thickness of the polypropylene optical film 31 is 6.8 μm, the rated voltage of the capacitor is 35kV, the nominal capacitance is 250 μ F ± 2%, the stored energy is 153125J, the stored energy density is 0.8J/cm3, the maximum repeatable current is 35kA, and the number of charging and discharging times under rated conditions exceeds 40000 times.

Further, the metallized polypropylene film 21 has a film width L of 150mm, a metallized layer overlapping region width L1 of 43.5mm, a misalignment L2 of 1.5mm, an edge screen region 47 width L3 of 5mm, a middle screen region 43 width L4 of 4mm, a wavy edge wavelength of 2.5mm, a peak-to-peak amplitude of 0.3mm, and a wavy edge length increased by more than 3% compared with a straight cut.

A manufacturing method of a high-voltage large-current pulse energy storage capacitor comprises the following steps:

1) Vacuum coating: the polypropylene optical film 31 film roll to be evaporated is placed in a vacuum degree of 2 multiplied by 10 ^-4 In a mbar vacuum coating machine, starting a film releasing system, firstly spraying shielding oil on a metal-free area planned on the surface of an optical film, and then sequentially carrying out physical vapor phase spraying on metal aluminum vapor and zinc vaporDepositing the metal layer on a specified area on the surface of the light film, and rolling the plated metallized polypropylene film 21;

2) Aging: the metallized polypropylene film 21 film roll after evaporation is kept still for more than 12 hours in the aging time of the temperature of 25 +/-5 ℃ and the humidity of less than or equal to 35 percent RH;

3) Cutting a film: the metallized polypropylene film 21 is rolled and cut into required specifications, a wave cutter is used for centrally cutting the edge, a zinc-aluminum composite area 41 is thickened to obtain a wave edge, and a straight cutter is used for centrally cutting the edge screen belt;

4) Winding: winding the two layers of metallized polypropylene films 21 by taking a hollow mandrel 22 as an axis;

5) Spraying gold: spraying zinc, zinc-tin alloy, zinc-aluminum alloy and the like on two end surfaces of the core element 11 to lead out electrodes;

6) Vacuum polymerization: placing the core element 11 in a vacuum tank with the vacuum degree of about 1pa, heating to 105 ℃, and keeping for more than 20 hours;

7) Testing the heart: measuring parameters such as pressure resistance, capacity and loss tangent of the core element 11, and removing unqualified products;

8) Dipping: impregnating the core element 11 with methyl silicone oil at the temperature of 60 ℃ for more than 12 hours;

9) Welding the series group 12: a plurality of core elements 11 are welded in series by using copper stranded wires 6 or copper strips;

10 A bushing: sheathing an insulating sleeve 13 on the serial group 12 and performing heat shrinkage;

11 Capacitor bank 1 welding: the end face of the core element 11 is connected with the lead-out copper bar 3 through a plurality of copper stranded wires 6 in a soldering mode to form a capacitor bank 1;

12 Capacitor bank 1 is wrapped: wrapping the capacitor bank 1 with an insulating wrapping material;

13 Capacitor bank 1 test: measuring parameters such as withstand voltage, capacity and loss tangent of the capacitor bank 1;

14 Perfusion: placing the capacitor bank 1 in a shell 2, placing an insulating plate, and filling the insulating plate with an insulating filling material, wherein the insulating filling material is polyurethane, epoxy resin or a mixture of the polyurethane and the epoxy resin, the filling frequency is not less than three times, and the next filling can be performed after the insulating filling material is basically cured every time;

15 Capacitor testing: measuring parameters such as interelectrode withstand voltage, pole shell withstand voltage, insulation resistance, capacity, loss tangent and the like of the capacitor;

16 Identify, pack, and store in storage.

Example 2

This example is substantially the same as the method of example 1 provided, with the main differences being:

the film width L of the metallized polypropylene film 21 is 150mm, the width L1 of the overlapping area of the metallized layer is 43.5mm, the misalignment L2 is 1.5mm, the width L3 of the edge screen area 47 is 5mm, the width L4 of the middle screen area 43 is 4mm, the wavelength of the wavy edge is 2.5mm, the peak-to-peak amplitude is 0.3mm, and the length of the wavy edge is increased by more than 3% compared with the straight cut;

the square resistance of the edge thickening zinc-aluminum composite area 41 and the middle thickening zinc-aluminum composite area 45 is 2-4 omega/\9633, the square resistance of the aluminum active area is 40-55 omega/\9633; since the thickness of the metallization layer is around a few tens of nanometers, which is difficult to measure, the thickness of the metallization layer is expressed using the sheet resistance; the larger the square resistance is, the thinner the thickness of the metallization layer is, the higher the voltage which can be born relatively is, the larger the width of the aluminum active area is, the square resistance is set to be 40-55 omega/\9633andthe higher voltage resistance of the metallization film can be ensured; the thickened zinc-aluminum composite region 41 on the edge has small square resistance and the thickness of the metallization layer is large, so that the metallization layer and the metal spraying layer can be bonded more tightly when the core element 11 is manufactured; the thick metallized layer of the middle thickened Zn-Al composite region 45 is used as a wire to tightly connect two series regions.

Example 3

This example is substantially the same as the method of example 1 provided, with the main differences being:

the rated voltage of the capacitor is 8kV, the rated capacitance is 720 muF +/-2%, the energy is stored for 23040J, the energy storage density is 0.312J/cm < 3 >, the repeatable current is 40kA, and the charging and discharging times under the rated condition exceed 40000 times;

furthermore, the core elements 11 have nominal capacitance of 40 muF, 2 core elements 11 are connected in series to form a series group, 36 series groups are orderly arranged according to four rows and nine columns, and the capacitor bank 1 consists of 72 core elements 11 with the same specification;

further, the thickness of the polypropylene optical film 31 is 4.8 μm; the designed field strength of the capacitor is 277.8 VDC/mum (film thickness), the sustainable withstand voltage is 416.7 VDC/mum (designed according to 1.5 times rated voltage), and the design repeatable current is 3A/m (film length); the design field intensity of the capacitor is not high, and the capacitor is mainly designed according to repeatable current;

in this embodiment, four 8kV720 μ F capacitors are connected in series, so that the electrical performance of the capacitor bank 1 connected in series with 216 1100V500 μ F24 can be obtained, high withstand voltage, high repeatable factory current and high energy storage are provided for the equipment, the service life performance is good, and the occupied space, the installation difficulty and the reliability of the capacitor bank 1 are greatly improved.

Example 4

This example is substantially the same as the method of example 1 provided, with the main differences being:

the rated voltage of the capacitor is 35kV, the rated capacitance is 250 muF +/-2%, the energy storage is 153125J, the energy storage density is 0.8J/cm < 3 >, the maximum repeatable current is 35kA, and the charging and discharging times under the rated condition exceed 40000 times;

further, the structure size and sheet resistance of the metallized polypropylene film 21 are the same as those of the example 2, and the thickness of the polypropylene optical film 31 is 6.8 μm; the designed field strength of the capacitor is 428.9 VDC/mum (film thickness), the sustainable withstand voltage is 514.7 VDC/mum (designed according to 1.2 times of rated voltage), and the design repeatable current is 3A/m (film length); the capacitor is mainly designed according to the highest withstand voltage of the capacitor;

furthermore, the core elements 11 have a nominal capacitance of 20 μ F,4 core elements 11 are connected in series to form a series group 12, 50 series groups are arranged regularly according to five rows and ten columns, and the capacitor bank 1 consists of 200 core elements 11 with the same specification;

in the embodiment, the rated voltage of the capacitor is very high and reaches 35kV, but the maximum repeatable current is 35kA and is lower than that of an 8kV720 mu F capacitor; the use environments of the capacitors in example 3 and example 4 are still different; the implementation of the present invention requires appropriate selection of design parameters according to the use of the capacitor.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes by using the technical contents disclosed in the above description to other fields, but any simple modification, equivalent change and change made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (9)

1. A high-voltage large-current pulse energy storage capacitor is characterized in that: the capacitor bank comprises a capacitor bank (1), a shell (2), a lead-out copper bar (3), an insulating plate, an insulating packaging material (4) and a resin pouring material (5), wherein the capacitor bank (1) is composed of a plurality of core elements (11) with the same specification, at least 2 of the core elements (11) are connected in series to form a series connection group (12), an insulating sleeve (13) is arranged outside the series connection group (12), the end faces of the same polarity of the series connection group (12) are located on the same plane, the end faces of different polarities are kept to be larger than the position of an electric insulation distance and are arranged, and the end faces of the core elements (11) are connected with the lead-out copper bar (3) through a plurality of copper stranded wires (6) in a tin soldering mode.

2. A high voltage high current pulse energy storage capacitor according to claim 1, wherein: the core element (11) is a cylinder formed by winding two layers of metalized polypropylene films (21) by taking a hollow core rod (22) as a shaft, and metal layers (23) used for leading out electrodes are sprayed on two ends of the cylinder.

3. A high voltage high current pulse energy storage capacitor according to claim 2, wherein: the metallized polypropylene film (21) is sequentially provided with a polypropylene film (31), an aluminum metallized layer (32) and a zinc thickening layer (33) from bottom to top.

4. A high voltage high current pulse energy storage capacitor according to claim 2, wherein: two-layer metallization polypropylene membrane (21) thickness is the same, and wide L, the upper strata the edge of metallization polypropylene membrane (21) is provided with thickening zinc aluminium composite area (41), the lower floor metallization polypropylene membrane (21) is provided with marginal screen area (47), thickening zinc aluminium composite area (41) are corresponding with marginal screen area (47).

5. A high voltage high current pulse energy storage capacitor according to claim 2, wherein: metallized polypropylene membrane (21) has set gradually edge thickening zinc aluminium complex region (41), aluminium active area (42), middle screen area (43), aluminium active area two (44), middle thickening zinc aluminium complex region (45), aluminium active area three (46), edge screen area (47) along the membrane width direction, the edge of edge thickening zinc aluminium complex region (41) is the wave limit along the membrane length direction.

6. A high voltage high current pulse energy storage capacitor according to claim 2, wherein: the metallized polypropylene film (21) has the film width L of 145-155mm, the width L1 of the overlapping area of the metallized layer of 43.45-43.55mm, the misalignment L2 of 1.4-1.6mm, the width L3 of the edge screen area (47) of 4.5-5.5mm, the width L4 of the middle screen area (43) of 3.5-4.5mm, the wavelength of the wave edge of 2.45-2.55mm and the peak-peak amplitude of 0.25-0.4mm.

7. A high-voltage high-current pulse energy-storage capacitor according to claim 5, characterized in that: the edge thickened zinc-aluminum composite region (41) and the middle thickened zinc-aluminum composite region (45) are both provided with square resistors, the square resistors are 2-4 omega/\9633, and the square resistors of the aluminum active region are 40-55 omega/\9633.

8. A high voltage high current pulse energy storage capacitor according to claim 2, wherein: two-layer metallization polypropylene membrane (21) thickness is the same, and the membrane width is L, upper strata the marginal thickening zinc aluminium composite region (41) of metallization polypropylene membrane (21) corresponds marginal screen area (47) of lower floor metallization polypropylene membrane (21), the distance of marginal thickening zinc aluminium composite region (41) mistake is L2, marginal screen area (47) width is L3, middle screen area 43 width is L4, and is two-layer the region of metallization polypropylene membrane (21) metallization layer coincidence has threely, and the width is L1.

9. A method for manufacturing a high-voltage large-current pulse energy-storage capacitor, according to claims 1-8, wherein: the method comprises the following steps:

s1, vacuum coating: placing the polypropylene optical film (31) roll to be evaporated in a vacuum degree of 2 x 10 ^-4 Starting a film releasing system in a mbar vacuum film plating machine, spraying shielding oil on a planned metal-free area on the surface of an optical film, then sequentially performing physical vapor deposition on metal aluminum vapor and zinc vapor to a specified area on the surface of the optical film, and rolling the plated metallized polypropylene film (21);

s2, aging: the metallized polypropylene film (21) which is evaporated is kept still for more than 12 hours in the aging time of the temperature of 25 +/-5 ℃ and the humidity of less than or equal to 35 percent RH;

s3, cutting the film: the metallized polypropylene film (21) is rolled and cut into required specifications, the edge thickening zinc-aluminum composite area (41) is cut in the middle by a wave cutter to obtain a wave edge, and the edge screen belt is cut in the middle by a straight cutter;

s4, winding: winding the two layers of metallized polypropylene films (21) by taking the hollow mandrel (22) as an axis;

s5, spraying gold: spraying zinc, zinc-tin alloy and zinc-aluminum alloy on two end surfaces of the core element (11) to lead out electrodes;

s6, vacuum polymerization: placing the core element (11) in a vacuum tank with the vacuum degree of about 1pa, heating to 105 +/-5 ℃, and keeping for more than 20 hours;

s7, testing the heart: measuring the parameters of pressure resistance, capacity and loss angle tangent of the core element (11), and removing unqualified products;

s8, dipping: impregnating the core element (11) with methyl silicone oil at a temperature of 60 +/-5 ℃ for more than 12 hours;

s9, welding the series group (12): a plurality of core elements (11) are welded in series by using the copper stranded wires (6) or the copper strips;

s10, sleeving a sleeve: an insulating sleeve (13) is sleeved outside the serial group (12) and is subjected to heat shrinkage;

s11, welding the capacitor bank (1): the end face of the core element (11) is connected with the lead-out copper bar (3) through a plurality of strands of copper stranded wires (6) in a soldering mode to form the capacitor bank (1);

s12, packaging the capacitor bank (1): wrapping the capacitor bank (1) with an insulating wrapping;

s13, testing the capacitor bank (1): measuring the parameters of the voltage resistance, capacity and loss tangent of the capacitor bank (1);

s14, perfusion: placing the capacitor bank (1) in a shell (2), placing an insulating plate, and filling the capacitor bank with an insulating filling material, wherein the insulating filling material is polyurethane, epoxy resin or a mixture of the polyurethane and the epoxy resin, the filling frequency is not less than three times, and the next filling can be performed after the insulating filling material is basically cured every time;

s15, testing the capacitor: measuring interelectrode withstand voltage, pole shell withstand voltage, insulation resistance, capacity and loss tangent parameters of the capacitor;

and S16, marking, packaging and warehousing.

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