CN114792602A - Energy storage thin film capacitor - Google Patents
Energy storage thin film capacitor Download PDFInfo
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- CN114792602A CN114792602A CN202210459412.6A CN202210459412A CN114792602A CN 114792602 A CN114792602 A CN 114792602A CN 202210459412 A CN202210459412 A CN 202210459412A CN 114792602 A CN114792602 A CN 114792602A
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- polypropylene
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- energy storage
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- 239000003990 capacitor Substances 0.000 title claims abstract description 71
- 238000004146 energy storage Methods 0.000 title claims abstract description 30
- 239000010409 thin film Substances 0.000 title claims abstract description 23
- 239000010408 film Substances 0.000 claims abstract description 149
- -1 polypropylene Polymers 0.000 claims abstract description 148
- 239000004743 Polypropylene Substances 0.000 claims abstract description 144
- 229920001155 polypropylene Polymers 0.000 claims abstract description 144
- 229910052751 metal Inorganic materials 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 53
- 239000002131 composite material Substances 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 11
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 90
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 25
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 23
- GOPYZMJAIPBUGX-UHFFFAOYSA-N [O-2].[O-2].[Mn+4] Chemical class [O-2].[O-2].[Mn+4] GOPYZMJAIPBUGX-UHFFFAOYSA-N 0.000 claims description 22
- 229920000642 polymer Polymers 0.000 claims description 20
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 claims description 17
- 229920000147 Styrene maleic anhydride Polymers 0.000 claims description 17
- 229920001225 polyester resin Polymers 0.000 claims description 17
- 239000004645 polyester resin Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910001868 water Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 150000002576 ketones Chemical class 0.000 claims description 7
- 229920000110 poly(aryl ether sulfone) Polymers 0.000 claims description 7
- MCPTUMJSKDUTAQ-UHFFFAOYSA-N vanadium;hydrate Chemical compound O.[V] MCPTUMJSKDUTAQ-UHFFFAOYSA-N 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 5
- 229920006026 co-polymeric resin Polymers 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims 2
- 239000011347 resin Substances 0.000 claims 2
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 26
- 230000015556 catabolic process Effects 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000002360 preparation method Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 6
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- BGNXCDMCOKJUMV-UHFFFAOYSA-N Tert-Butylhydroquinone Chemical compound CC(C)(C)C1=CC(O)=CC=C1O BGNXCDMCOKJUMV-UHFFFAOYSA-N 0.000 description 2
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000004250 tert-Butylhydroquinone Substances 0.000 description 2
- 235000019281 tert-butylhydroquinone Nutrition 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/242—Terminals the capacitive element surrounding the terminal
- H01G4/245—Tabs between the layers of a rolled electrode
-
- 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
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/14—Organic dielectrics
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- 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 capacitors, and discloses an energy storage thin film capacitor, which comprises: the capacitor comprises an accommodating box, a sealing cover, a capacitor roll, a first tab, a second tab, a first conducting strip, a second conducting strip, a first lead and a second lead. The energy storage film capacitor is formed by arranging a first polypropylene composite film and a second polypropylene composite film and rolling the first polypropylene composite film and the second polypropylene composite film in parallel and in the same direction to form a capacitor roll. A first vacant surface is arranged in the first polypropylene base film, and a second vacant surface is arranged in the second polypropylene base film. The surface connection between the second electrode lug and the second metal layer is realized, and the surface connection between the first electrode lug and the first metal layer is realized. The connection performance is improved, and then the charge and discharge capacity of the whole energy storage film capacitor is improved.
Description
Technical Field
The invention belongs to the technical field of capacitors, and particularly relates to an energy storage thin film capacitor.
Background
The thin film capacitance refers to capacitance formed by a thin film as a dielectric. The existing film capacitor is generally formed by plating a metal layer on a film to form a first composite film and a second composite film, and then the first composite film and the second composite film are wound in parallel and in the same direction to form a capacitor roll. In order to lead the first tab out of the first composite film, the first tab is generally formed by placing a wire at any position of the first composite film in the process of rolling, and then pulling out the wire. In order to lead out the second tab from the second composite film, the second tab is generally formed by placing a wire at any position of the second composite film in the process of rolling, and then pulling out the wire.
However, in the method of drawing the first tab and the second tab, the wire is connected to the first composite film or the second composite film in a line, so that the contact area is not large, and thus poor contact is likely to occur. Such poor contact can degrade the charging or discharging performance of the overall energy storage film capacitor.
Disclosure of Invention
The present invention is directed to an energy storage thin film capacitor, which solves one or more of the problems of the prior art and provides at least one of the advantages of the present invention.
The solution of the invention for solving the technical problem is as follows: an energy storage thin film capacitor is provided, which is characterized by comprising: the battery comprises an accommodating box, a sealing cover, a first polypropylene composite film, a second polypropylene composite film, a first tab, a second tab, a first conducting plate, a second conducting plate, a first lead and a second lead;
the first polypropylene composite film and the second polypropylene composite film are wound in parallel and in the same direction to form a capacitor roll;
the first pole lug and the second pole lug are embedded into the sealing cover, and the capacitor roll, the first conducting strip, the second conducting strip, the first lead and the second lead are all positioned in the accommodating box;
the first lug and the second lug are embedded into the sealing cover, and the capacitor roll, the first conducting strip, the second conducting strip, the first lead and the second lead are all positioned in the accommodating box;
the capacitor roll is formed by rolling a first polypropylene composite film and a second polypropylene composite film in parallel and in the same direction;
the first polypropylene composite film comprises: the surface side of the first polypropylene base film is plated with a first metal layer; the second polypropylene composite film comprises: the surface side of the second polypropylene base film is plated with a second metal layer;
a first long side of the first metal layer is coincided with a first long side of the surface side of the first polypropylene base film, a first empty surface is arranged between a second long side of the first metal layer and a second long side of the surface side of the first polypropylene base film, a first short side of the first metal layer is coincided with a first short side of the surface side of the first polypropylene base film, and a second short side of the first metal layer is coincided with a second short side of the surface side of the first polypropylene base film;
the first long side of the second metal layer is coincided with the second long side of the surface side of the second polypropylene base film, a second empty surface is arranged between the second long side of the second metal layer and the first long side of the surface side of the second polypropylene base film, the first short side of the second metal layer is coincided with the first short side of the inner side of the second polypropylene base film, and the second short side of the second metal layer is coincided with the second short side of the inner side of the second polypropylene base film;
the upper side face of the capacitor roll is connected with the first conducting strip through conducting adhesive, the lower side face of the capacitor roll is connected with the second conducting strip through conducting adhesive, one end of the first wire is welded with the first pole lug, the other end of the first wire is welded with the first conducting strip, one end of the second wire is welded with the second pole lug, and the other end of the second wire is welded with the second conducting strip;
the sealing cover seals the accommodating box, and the residual gap of the accommodating box is filled and sealed by insulating pouring sealant.
Further, the conductive adhesive is conductive silver adhesive.
Further, the first tab is provided with a first welding auxiliary hole at a part away from the sealing cover.
Furthermore, the second tab is provided with a second welding auxiliary hole at the part away from the sealing cover.
Further, the preparation method of the first polypropylene base film is the same as that of the second polypropylene base film, and the preparation method of the first polypropylene base film specifically comprises the following steps:
(1) mixing manganese dioxide, vanadium pentoxide and water, performing ultrasonic dispersion, adding a polymer, heating to 70-100 ℃, preserving heat, drying, and performing ball milling to obtain modified manganese dioxide and vanadium pentoxide, wherein the weight ratio of manganese dioxide to vanadium pentoxide to the polymer is 1: (0.1-0.5): (10-20), the polymer is selected from at least one of polyvinyl alcohol, polyethylene glycol or polyethylene wax;
(2) mixing polypropylene, styrene-maleic anhydride copolymer and polyester resin, heating to a molten state, adding the modified manganese dioxide prepared in the step (1), vanadium pentoxide and a silane coupling agent, mixing, pressurizing, extruding, cooling, and performing biaxial tension to obtain the first polypropylene base film.
Further, in the step (1), manganese dioxide, vanadium pentoxide and water are mixed, ultrasonically dispersed, then a polymer is added, the temperature is raised to 70-90 ℃, and the temperature is kept for 1-3 hours.
Further, in the step (1) and the step (2), the weight ratio of the polypropylene to the styrene-maleic anhydride copolymer to the polyester resin is 1: (1.2-2.5): (1-5).
Further, in the step (2), the weight ratio of the total weight of the polypropylene, the styrene-maleic anhydride copolymer and the polyester resin to the weight of the modified manganese dioxide, the vanadium pentoxide and the silane coupling agent is 100: (1-6): (10-25).
Further, in the step (2), an auxiliary agent is added while adding the silane coupling agent, wherein the auxiliary agent comprises at least one of an antioxidant, an ultraviolet absorbent or a dispersing agent.
Further, in the step (2), while adding the silane coupling agent, adding polyarylethersulfone ketone.
The beneficial effects of the invention are: the energy storage film capacitor is formed by arranging a first polypropylene composite film and a second polypropylene composite film, and rolling the first polypropylene composite film and the second polypropylene composite film in parallel and in the same direction to form a capacitor roll. A first empty surface is arranged in a first polypropylene base film, and a second empty surface is arranged in a second polypropylene base film. The surface connection between the second electrode lug and the second metal layer is realized, and the surface connection between the first electrode lug and the first metal layer is realized. The connection performance is improved, and then the charge and discharge capacity of the whole energy storage film capacitor is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a schematic perspective view of an energy storage thin film capacitor;
FIG. 2 is a schematic cross-sectional structure diagram of an energy storage thin film capacitor;
FIG. 3 is a schematic view of the structure of a first polypropylene composite film;
FIG. 4 is a schematic structural view of a second polypropylene composite film;
fig. 5 is a schematic diagram of a partial cross-sectional structure of a capacitor roll.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts are within the protection scope of the present invention based on the embodiments of the present invention. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliaries according to specific implementation conditions. The technical characteristics in the invention can be combined interactively on the premise of not conflicting with each other.
This embodiment provides an energy storage thin film capacitor, includes: the container 100, the cover 200, the first polypropylene composite film, the second polypropylene composite film, the first tab 210, the second tab 220, the first conductive sheet 401, the second conductive sheet 402, the first lead 501 and the second lead 502. The first and second polypropylene composite films are wound in parallel co-axial rolls to form a capacitor roll 300.
The first tab 210 and the second tab 220 are embedded in the cover 200, and the capacitor roll 300, the first conductive sheet 401, the second conductive sheet 402, the first lead 501 and the second lead 502 are all located in the accommodating box 100; the first polypropylene composite film comprises: a first polypropylene base film 310, a surface side of the first polypropylene base film 310 being plated with a first metal layer 301; the second polypropylene composite film comprises: a second polypropylene-based film 320, a surface side of the second polypropylene-based film 320 being plated with a second metal layer 302.
The first long side of the first metal layer 301 coincides with the first long side of the surface side of the first polypropylene base film 310, the second long side of the first metal layer 301 coincides with the second long side of the surface side of the first polypropylene base film 310 with a first void 311 therebetween, the first short side of the first metal layer 301 coincides with the first short side of the surface side of the first polypropylene base film 310, and the second short side of the first metal layer 301 coincides with the second short side of the surface side of the first polypropylene base film 310.
The first long side of the second metal layer 302 coincides with the second long side of the front side of the second polypropylene-based film 320, a second void 312 is provided between the second long side of the second metal layer 302 and the first long side of the front side of the second polypropylene-based film 320, the first short side of the second metal layer 302 coincides with the first short side of the back side of the second polypropylene-based film 320, and the second short side of the second metal layer 302 coincides with the second short side of the back side of the second polypropylene-based film 320.
The upper side of the capacitor roll 300 is connected with the first conductive sheet 401 through a conductive adhesive, the lower side of the capacitor roll 300 is connected with the second conductive sheet 402 through a conductive adhesive, one end of the first wire 501 is welded with the first tab 210, the other end of the first wire 501 is welded with the first conductive sheet 401, one end of the second wire 502 is welded with the second tab 220, and the other end of the second wire 502 is welded with the second conductive sheet 402; the sealing cover 200 seals the accommodating box 100, and the remaining gaps of the accommodating box 100 are filled and sealed by insulating pouring sealant.
In the present embodiment, the first metal layer 301 is plated on the front side of the first polypropylene base film 310 by evaporation; the second metal layer 302 is plated on the front side surface of the second polypropylene-based film 320 by evaporation. The first metal layer 301 and the second metal layer 302 are both aluminum metal layers.
The purpose that this energy storage film electric capacity set up is solved prior art, has contact failure easily between first polypropylene composite film and the first utmost point ear 210, has contact failure easily between second polypropylene composite film and the second utmost point ear 220, finally leads to the not good problem of whole condenser charge-discharge performance.
To solve this technical problem, the first metal layer 301 is plated on the set position of the first polypropylene base film 310, specifically such that: the first long side of the first metal layer 301 coincides with the first long side of the front side of the first polypropylene base film 310, and a first void 311 is formed between the second long side of the first metal layer 301 and the second long side of the front side of the first polypropylene base film 310.
The second metal layer 302 is plated on a set position of the second polypropylene base film 320, specifically such that: the first long side of the second metal layer 302 coincides with the second long side of the front side of the second polypropylene-based film 320, and a second void 312 is provided between the second long side of the second metal layer 302 and the first long side of the front side of the second polypropylene-based film 320.
The first empty surface 311 functions to make the first polypropylene composite film have a certain distance from the lower side of the capacitor roll 300 when the first polypropylene composite film is rolled into the capacitor roll 300. The second empty surface 312 functions to make the second polypropylene composite film have a certain distance from the upper side of the capacitor roll 300 when the second polypropylene composite film is rolled into the capacitor roll 300.
Due to the existence of the second empty surface 312, when the first conductive sheet 401 is connected with the upper side surface of the capacitor roll 300 through the conductive adhesive, the first conductive sheet 401 is only connected with the first metal layer 301, and due to the participation of the conductive adhesive and the structure of the capacitor roll 300, the first conductive sheet 401 is connected with the first metal layer 301 in a surface contact manner, and then the first conductive sheet 401 and the first tab 210 are respectively connected by using the first wire 501, so that the connection performance of the first tab 210 and the first metal sheet is improved.
Due to the presence of the first vacant face 311, the second conductive sheet 402 is connected only to the second metal layer 302 when the second conductive sheet 402 is connected to the lower side face of the capacitor roll 300 by the conductive paste. And due to the participation of the conductive adhesive and the structure of the capacitor roll 300, the second conductive sheet 402 is connected with the second metal layer 302 in a surface contact manner. Then, the second conducting strip 402 and the second electrode tab 220 are connected by the second conducting wire 502, so that the connection performance between the second electrode tab 220 and the second metal sheet is improved.
The energy storage film capacitor is formed by arranging a first polypropylene composite film and a second polypropylene composite film, and rolling the first polypropylene composite film and the second polypropylene composite film in parallel and in the same direction to form a capacitor roll 300. By providing a first blank surface 311 in the first polypropylene-based film 310 and a second blank surface 312 in the second polypropylene-based film 320. The surface connection between the second tab 220 and the second metal layer 302 is realized, and the surface connection between the first tab 210 and the first metal layer 301 is realized. The connection performance is improved, and then the charge and discharge capacity of the whole energy storage thin film capacitor is improved.
In some preferred embodiments, the conductive adhesive is a conductive silver adhesive.
In some preferred embodiments, the first tab 210 is provided with a first welding auxiliary hole 211 at a portion away from the cover 200. The welding between the first tab 210 and the external pad may be facilitated by the first welding auxiliary hole 211.
In some preferred embodiments, the second tab 220 is provided with a second welding auxiliary hole 222 at a portion away from the cover 200. The bonding between the second pole ear 220 and the external pad may be facilitated by the second bonding auxiliary hole 222.
The material of the first polypropylene-based film 310 is the same as that of the second polypropylene-based film 320. Taking the first polypropylene base film 310 as an example, the first polypropylene base film 310 can be obtained by a production process of the prior art. However, the first polypropylene-based film 310 obtained by the conventional forming process has a low dielectric constant. The energy storage thin film capacitor manufactured by the first polypropylene base film 310 obtained by the existing generation process has relatively low energy storage density and poor voltage resistance. Therefore, the present application also provides a method for preparing the first polypropylene base film 310, and the first polypropylene base film 310 prepared by the method can well solve the defects in the prior art. The whole energy storage film capacitor has higher energy storage density and better voltage resistance.
The preparation of the first polypropylene based film 310 is described in detail below by way of a number of specific examples:
the starting materials, reagents or apparatuses used in the following examples are, unless otherwise specified, either commercially available from conventional sources or can be obtained by known methods.
Example 1: preparation of first polypropylene-based film 310
A method for preparing a first polypropylene-based film 310, comprising the steps of:
(1) mixing manganese dioxide, vanadium pentoxide and water, performing ultrasonic dispersion, adding a polymer (polyvinyl alcohol), heating to 80 ℃, keeping the temperature for 2 hours, drying under a vacuum condition, and performing ball milling to obtain modified manganese dioxide and vanadium pentoxide, wherein the weight ratio of the manganese dioxide to the vanadium pentoxide to the polymer is 1: 0.2: 12, the weight ratio of manganese dioxide to water is 1: 50; the mesh number of the modified manganese dioxide and the vanadium pentoxide is 150-160 meshes;
(2) mixing polypropylene, styrene-maleic anhydride copolymer and polyester resin, wherein the weight ratio of the polypropylene to the styrene-maleic anhydride copolymer to the polyester resin is 1: 1.5: heating to a molten state, adding the modified manganese dioxide, vanadium pentoxide and a silane coupling agent prepared in the step (1), and mixing, wherein the weight ratio of the total weight of the polypropylene, the styrene-maleic anhydride copolymer and the polyester resin to the modified manganese dioxide, vanadium pentoxide and the silane coupling agent is 100: 2: 12, pressing, extruding, cooling in an extruder to obtain a film sheet, and then biaxially stretching (pressing, extruding, cooling, biaxially stretching are conventional processes in the art) in a longitudinal stretcher and a transverse orientation device to obtain a first polypropylene base film 310.
Example 2: preparing a first polypropylene base film 310;
a method for preparing a first polypropylene-based film 310, comprising the steps of:
(1) mixing manganese dioxide, vanadium pentoxide and water, performing ultrasonic dispersion, adding a polymer (polyethylene wax), heating to 90 ℃, keeping the temperature for 2 hours, drying under a vacuum condition, and performing ball milling to obtain modified manganese dioxide and vanadium pentoxide, wherein the weight ratio of the manganese dioxide to the vanadium pentoxide to the polymer is 1: 0.3: 14, the weight ratio of manganese dioxide to water is 1: 60, adding a solvent to the mixture; the mesh number of the modified manganese dioxide and the vanadium pentoxide is 150-160 meshes;
(2) mixing polypropylene, styrene-maleic anhydride copolymer and polyester resin, wherein the weight ratio of the polypropylene to the styrene-maleic anhydride copolymer to the polyester resin is 1: 2: and 5, heating to a molten state, adding the modified manganese dioxide prepared in the step 1, vanadium pentoxide, a silane coupling agent, an antioxidant (tert-butyl hydroquinone, the weight of the tert-butyl hydroquinone is 5% of that of the silane coupling agent), an ultraviolet absorbent (2-hydroxy-4-methoxybenzophenone, the weight of the 2-hydroxy-4-methoxybenzophenone is 4% of that of the silane coupling agent), a dispersing agent (sodium dodecyl sulfate, the weight of the sodium dodecyl sulfate is 6% of that of the silane coupling agent), mixing, wherein the weight ratio of the total weight of the polypropylene, the styrene-maleic anhydride copolymer and the polyester resin to the weight of the modified manganese dioxide, the vanadium pentoxide and the silane coupling agent is 100: 3: 15, pressing, extruding, cooling in an extruder to obtain a film sheet, and then performing biaxial stretching (pressing, extruding, cooling, biaxial stretching are conventional processes in the art) in a longitudinal stretcher and a transverse orientation device to obtain a first polypropylene base film 310.
Example 3: preparation of a first polypropylene-based film 310;
a method for preparing a first polypropylene-based film 310, comprising the steps of:
(1) mixing manganese dioxide, vanadium pentoxide and water, performing ultrasonic dispersion, adding a polymer (polyethylene glycol), heating to 95 ℃, keeping the temperature for 3 hours, drying under a vacuum condition, and performing ball milling to obtain modified manganese dioxide and vanadium pentoxide, wherein the weight ratio of the manganese dioxide to the vanadium pentoxide to the polymer is 1: 0.5: 18, the weight ratio of manganese dioxide to water is 1: 90; the mesh number of the modified manganese dioxide and the vanadium pentoxide is 150-160 meshes;
(2) mixing polypropylene, styrene-maleic anhydride copolymer and polyester resin, wherein the weight ratio of the polypropylene to the styrene-maleic anhydride copolymer to the polyester resin is 1: 2: 4.5, heating to a molten state, adding the modified manganese dioxide and vanadium pentoxide prepared in the step (1), a silane coupling agent, an antioxidant (dibutyl hydroxy toluene, the weight of the dibutyl hydroxy toluene is 6% of that of the silane coupling agent), an ultraviolet absorbent (2-hydroxy-4-methoxy benzophenone, the weight of the 2-hydroxy-4-methoxy benzophenone is 3% of that of the silane coupling agent), a dispersing agent (polyacrylamide, the weight of the polyacrylamide is 5% of that of the silane coupling agent), and polyarylethersulfone ketone (the weight of the polyarylethersulfone ketone is 10% of that of the silane coupling agent) to mix, wherein the weight ratio of the total weight of the polypropylene, the styrene-maleic anhydride copolymer and the polyester resin to the weight of the modified manganese dioxide, vanadium pentoxide and the silane coupling agent is 100: 4: 18, pressing, extruding, cooling in an extruder to obtain a film sheet, and then biaxially stretching (pressing, extruding, cooling, biaxially stretching are conventional processes in the art) in a longitudinal stretcher and a transverse orientation device to obtain a first polypropylene base film 310.
Example 4: preparing a first polypropylene base film 310;
in comparison with example 3, in example 4, no PPESK is added, and the rest of the procedure is the same as in example 3.
Comparative example 1;
comparative example 1 is different from example 1 only in that equal amounts of manganese dioxide and vanadium pentoxide are directly added in comparative example 1, i.e., the manganese dioxide and vanadium pentoxide in comparative example 1 are not modified, and the rest of the process is the same as in example 1.
Comparative example 2;
comparative example 2 is different from example 2 only in that manganese dioxide is not added in step (1) of comparative example 2 and the rest of the process is the same as example 2.
Comparative example 3;
comparative example 3 is different from example 2 only in that vanadium pentoxide is not added in step (1) of comparative example 3, and the rest of the procedure is the same as example 2.
Comparative example 4;
comparative example 4 is different from example 3 only in that in step (1) of comparative example 4, polyacrylate is used instead of polyethylene glycol in example 3, and the rest of the procedure is the same as in example 3.
Comparative example 5;
comparative example 5 is different from example 3 only in that the weight ratio of manganese dioxide, vanadium pentoxide, polymer in step (1) of comparative example 5 is 1: 0.7: 6, the rest of the procedure was the same as in example 3.
And (3) testing the product effect:
the first polypropylene-based films 310 obtained in examples 1 to 4 and comparative examples 1 to 5 were assembled into capacitors, respectively, in the same manner, and the capacitors were subjected to dielectric constant measurement (for example, by a radio frequency impedance material analyzer) and breakdown strength measurement (for example, by a program-controlled withstand voltage tester) in the conventional manner, and the results are shown in table 1.
TABLE 1
| Dielectric constant (10 GHz) | Breakdown strength (KV/cm) | |
| Example 1 | 15.4 | 5105 |
| Example 2 | 15.8 | 5130 |
| Example 3 | 16.5 | 5204 |
| Example 4 | 15.9 | 5138 |
| Comparative example 1 | 8.8 | 4202 |
| Comparative example 2 | 9.6 | 4299 |
| Comparative example 3 | 9.7 | 4301 |
| Comparative example 4 | 12.2 | 4948 |
| Comparative example 5 | 14.5 | 4999 |
As can be seen from table 1, the first polypropylene-based film 310 prepared in examples 1 to 4 has a dielectric constant and breakdown strength significantly superior to those of comparative examples 1 to 5.
From the results of examples 3 and 4, it can be seen that the addition of the polyarylethersulfone ketone can significantly improve the dielectric constant and breakdown strength of the capacitor corresponding to the first polypropylene-based film 310.
It can be seen from the results of example 1 and comparative example 1 that the dielectric constant and breakdown strength of the capacitor corresponding to the first polypropylene-based film 310 can be significantly reduced without modifying the manganese dioxide and vanadium pentoxide, which indicates that the method for modifying manganese dioxide and vanadium pentoxide according to the present invention can improve the dielectric constant and breakdown strength of the capacitor corresponding to the first polypropylene-based film 310.
As can be seen from the results of example 2 and comparative examples 2 to 3, in the preparation of the first polypropylene base film 310, manganese dioxide and vanadium pentoxide need to be added simultaneously to improve the dielectric constant and breakdown strength of the capacitor corresponding to the first polypropylene base film 310.
From the results of example 3 and comparative examples 4-5, it can be seen that in the modification process of manganese dioxide and vanadium pentoxide, the dielectric constant and breakdown strength of the capacitor corresponding to the first polypropylene-based film 310 are affected by the selection of the polymer and the dosage relationship of manganese dioxide, vanadium pentoxide and the polymer.
Raw material components for preparing the first polypropylene base film 310 comprise polypropylene, a styrene-maleic anhydride copolymer, polyester resin, a silane coupling agent, modified manganese dioxide and vanadium pentoxide, wherein the modified manganese dioxide and the vanadium pentoxide are modified by polymers with specific dosage at a specific temperature (70-100 ℃), and the polymers are selected from at least one of polyvinyl alcohol, polyethylene glycol or polyethylene wax; the weight ratio of the manganese dioxide to the vanadium pentoxide to the polymer is 1: (0.1-0.5): (10-20). Because the modified manganese dioxide and vanadium pentoxide are matched with other components (polypropylene, styrene-maleic anhydride copolymer, polyester resin and silane coupling agent), the manganese dioxide and vanadium pentoxide have good compatibility with other components, and the dielectric constant and breakdown strength of the first polypropylene base film 310 can be obviously improved after the modified manganese dioxide and vanadium pentoxide are added. When the first polypropylene-based film 310 of the present invention is applied to a capacitor, the energy storage density of the capacitor can be significantly increased. The first polypropylene-based film 310 is applied to a capacitor, the dielectric constant is over 15.3 at 10GHz, and the breakdown strength is over 5100 KV/cm.
In the process of preparing the first polypropylene-based membrane 310 of the present invention, polyarylethersulfone ketone is also added. The introduction of the polyarylethersulfone ketone is helpful for improving the dielectric constant and the breakdown strength of the first polypropylene-based film 310.
In conclusion, the first polypropylene-based film 310 prepared by the preparation method of the present invention is applied to capacitors, and has a dielectric constant of over 15.3 at 10GHz and a breakdown strength of over 5100 KV/cm. There is a significant improvement over the prior art.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown, but is intended to cover various modifications and equivalents without departing from the spirit of the invention and within the scope and range of equivalents of the claims appended hereto.
Claims (10)
1. An energy storage thin film capacitor, comprising: the device comprises an accommodating box, a sealing cover, a first polypropylene composite film, a second polypropylene composite film, a first tab, a second tab, a first conducting strip, a second conducting strip, a first lead and a second lead;
the first polypropylene composite film and the second polypropylene composite film are wound in parallel and in the same direction to form a capacitor roll;
the first lug and the second lug are embedded into the sealing cover, and the capacitor roll, the first conducting strip, the second conducting strip, the first lead and the second lead are all positioned in the accommodating box;
the first polypropylene composite film comprises: the surface side of the first polypropylene base film is plated with a first metal layer; the second polypropylene composite film comprises: the surface side of the second polypropylene base film is plated with a second metal layer;
a first long side of the first metal layer is coincided with a first long side of the surface side of the first polypropylene base film, a first empty surface is arranged between a second long side of the first metal layer and a second long side of the surface side of the first polypropylene base film, a first short side of the first metal layer is coincided with a first short side of the surface side of the first polypropylene base film, and a second short side of the first metal layer is coincided with a second short side of the surface side of the first polypropylene base film;
the first long side of the second metal layer is coincided with the second long side of the surface side of the second polypropylene base film, a second empty surface is arranged between the second long side of the second metal layer and the first long side of the surface side of the second polypropylene base film, the first short side of the second metal layer is coincided with the first short side of the inner side of the second polypropylene base film, and the second short side of the second metal layer is coincided with the second short side of the inner side of the second polypropylene base film;
the upper side surface of the capacitor roll is connected with a first conducting strip through conducting resin, the lower side surface of the capacitor roll is connected with a second conducting strip through conducting resin, one end of a first wire is welded with a first tab, the other end of the first wire is welded with the first conducting strip, one end of a second wire is welded with a second tab, and the other end of the second wire is welded with the second conducting strip;
the sealing cover seals the accommodating box, and the residual gap of the accommodating box is filled and sealed by insulating pouring sealant.
2. An energy storage thin film capacitor as claimed in claim 1, wherein the conductive paste is a conductive silver paste.
3. An energy storing thin film capacitor as claimed in claim 1 wherein said first tab is provided with a first auxiliary weld hole in a portion away from the cover.
4. An energy storing thin film capacitor in accordance with claim 1 wherein said second tab is provided with a second auxiliary welding hole at a portion away from the cap portion.
5. The energy storage thin film capacitor of claim 1, wherein the first polypropylene-based film is prepared by the same method as the second polypropylene-based film, and the method for preparing the first polypropylene-based film specifically comprises the following steps:
(1) mixing manganese dioxide, vanadium pentoxide and water, performing ultrasonic dispersion, adding a polymer, heating to 70-100 ℃, preserving heat, drying, and performing ball milling to obtain modified manganese dioxide and vanadium pentoxide, wherein the weight ratio of manganese dioxide to vanadium pentoxide to the polymer is 1: (0.1-0.5): (10-20), the polymer is selected from at least one of polyvinyl alcohol, polyethylene glycol or polyethylene wax;
(2) mixing polypropylene, styrene-maleic anhydride copolymer and polyester resin, heating to a molten state, adding the modified manganese dioxide prepared in the step (1), vanadium pentoxide and a silane coupling agent, mixing, pressurizing, extruding, cooling, and performing biaxial stretching to obtain the first polypropylene base film.
6. The energy storage thin film capacitor of claim 5, wherein in the step (1), manganese dioxide, vanadium pentoxide and water are mixed, ultrasonically dispersed, then the polymer is added, the temperature is raised to 70-90 ℃, and the temperature is maintained for 1-3 hours.
7. The energy storage thin film capacitor of claim 5, wherein in the step (1), in the step (2), the weight ratio of the polypropylene, the styrene-maleic anhydride copolymer and the polyester resin is 1: (1.2-2.5): (1-5).
8. The energy storage thin film capacitor of claim 5, wherein in the step (2), the weight ratio of the total weight of the polypropylene, the styrene-maleic anhydride copolymer and the polyester resin to the weight of the modified manganese dioxide, the vanadium pentoxide and the silane coupling agent is 100: (1-6): (10-25).
9. The energy storage thin film capacitor of claim 5, wherein in step (2), an auxiliary agent is added simultaneously with the silane coupling agent, and the auxiliary agent comprises at least one of an antioxidant, an ultraviolet absorber or a dispersant.
10. The energy storage thin film capacitor of claim 5, wherein in the step (2), the polyarylethersulfone ketone is added at the same time as the silane coupling agent is added.
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| CN116313509A (en) * | 2023-01-18 | 2023-06-23 | 佛山市欣源电子股份有限公司 | Energy storage capacitor |
| CN116417262A (en) * | 2023-03-10 | 2023-07-11 | 佛山市欣源电子股份有限公司 | Automobile capacitor |
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| CN112863871A (en) * | 2021-03-24 | 2021-05-28 | 万裕三信电子(东莞)有限公司 | Capacitor single-end lead-out structure and capacitor |
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| CN206849701U (en) * | 2017-06-15 | 2018-01-05 | 佛山市顺德区顺美莱电子实业有限公司 | A kind of new metallized film capacitor |
| JP2019197787A (en) * | 2018-05-08 | 2019-11-14 | ルビコン株式会社 | Organic polymer capacitor |
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| CN116313509B (en) * | 2023-01-18 | 2023-09-05 | 佛山市欣源电子股份有限公司 | Energy storage capacitor |
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| CN116417262B (en) * | 2023-03-10 | 2023-10-03 | 佛山市欣源电子股份有限公司 | Automobile capacitor |
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