CN216708647U - Corrosion-resistant and heat-dissipation aluminum-plastic film for packaging polymer lithium ion battery - Google Patents
Corrosion-resistant and heat-dissipation aluminum-plastic film for packaging polymer lithium ion battery Download PDFInfo
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- CN216708647U CN216708647U CN202122910186.2U CN202122910186U CN216708647U CN 216708647 U CN216708647 U CN 216708647U CN 202122910186 U CN202122910186 U CN 202122910186U CN 216708647 U CN216708647 U CN 216708647U
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Abstract
The utility model relates to the technical field of battery packaging materials, in particular to a corrosion-resistant and heat-dissipation aluminum-plastic film for packaging a polymer lithium ion battery, which comprises a copolymer propylene layer CPP, a first adhesive layer, a corrosion-resistant film layer, a second adhesive layer, a heat conduction layer, an aluminum foil layer AL, a third adhesive layer and a heat dissipation layer which are sequentially stacked; the copolymerized propylene layer is CPP: corrosion resistant film layer: a heat conducting layer: aluminum foil layer AL: the thickness ratio of the heat dissipation layer is as follows: 1-4: 1: 0.2-1: 1.5-5: 1-6, the thickness of the copolymer propylene layer CPP1 is 20-40um, the thickness of the aluminum foil layer AL6 is 30-50um, and the thickness of the first adhesive, the second adhesive and the third adhesive is 1-6 um. The utility model solves the problems of corrosion of electrolyte in the battery inner core to packaging materials and difficult heat conduction generated in the battery inner core in the assembling and running processes of the lithium ion battery by additionally arranging the corrosion-resistant film layer and the heat conducting layer, has good barrier property and heat dissipation, improves the reliability of the battery and prolongs the service life of the battery.
Description
Technical Field
The utility model relates to the technical field of battery packaging materials, in particular to a corrosion-resistant and heat-dissipation aluminum-plastic film for packaging a polymer lithium ion battery.
Background
With the rapid development of electric vehicles and the trend of cleaning green energy in recent years, the battery technology and the yield are also rapidly improved, and the lithium ion battery is one of the most widely applied battery products in the market due to the unique advantages of the lithium ion battery. Along with the requirements of safety and energy storage, the proportion of the soft package lithium ion battery is larger and larger, and the packaging material of the soft package battery mainly adopts an aluminum plastic film.
Traditional laminate polymer battery plastic-aluminum membrane is basically by outer protective layer, middle aluminium foil barrier layer and inlayer heat-seal layer constitute, bond with the adhesive between the layer, outer protective layer generally chooses nylon for use and compounds, polypropylene is selected to inlayer heat-seal layer, however, the researcher discovers that the battery of this kind of plastic-aluminum membrane packing easily produces higher heat at lithium ion battery equipment and operation in-process, battery service temperature is higher, cause the battery to produce gas more easily, the emergence swell, electrolyte corrodes the packing plastic-aluminum membrane with higher speed, reduce lithium ion battery's life, lithium ion battery's stability and use universality have been influenced. Therefore, it is a problem to be solved by those skilled in the art how to prevent the electrolyte in the battery core from corroding the packaging material and to quickly dissipate the heat in the core.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a corrosion-resistant and heat-dissipating aluminum-plastic film for packaging a polymer lithium ion battery, which can prevent an electrolyte in an inner core of the battery from corroding a packaging material and quickly dissipate heat in the inner core.
In order to achieve the purpose, the utility model provides the following technical scheme: a corrosion-resistant and heat-dissipation aluminum-plastic film for packaging a polymer lithium ion battery comprises a copolymer propylene layer CPP, a first adhesive layer, a corrosion-resistant film layer, a second adhesive layer, a heat conduction layer, an aluminum foil layer AL, a third adhesive layer and a heat dissipation layer which are sequentially stacked; the copolymerized propylene layer is CPP: corrosion resistant film layer: a heat conducting layer: aluminum foil layer AL: the thickness ratio of the heat dissipation layer is as follows: 1-4: 1: 0.2-1: 1.5-5: 1-6, copolymerization propylene layer CPP thickness is 20-40um, and aluminium foil layer AL thickness is 30-50um, the thickness of first adhesive, second adhesive and third adhesive is 1-6 um.
Further, the corrosion-resistant film layer 3 is a polytetrafluoroethylene film, a perfluorosulfonic acid film, a polyvinylidene fluoride film or a polyvinyl chloride film, and the thickness of the corrosion-resistant film layer 3 is 10-50 um.
Further, the thickness of the corrosion resistant film layer 3 is 10-20 um.
Further, the heat conduction layer 5 is a graphene film, a graphite film, a carbon fiber film, a carbon nanotube film, a diamond powder film, a silicon-based film, a silver-based film, a gold-based film or a copper-based film, and the thickness of the heat conduction layer 5 is 2-20 um.
Further, the thickness of the heat conduction layer 5 is 2-6 um.
Further, the heat dissipation layer 8 is a graphene film, a graphite film, a carbon fiber film, a carbon nanotube film, a diamond powder film, a silicon-based film, a silver-based film, a gold-based film or a copper-based film, and the thickness of the heat dissipation layer 8 is 10-60 um.
Further, the thickness of the heat dissipation layer 8 is 10-30 um.
Compared with the prior art, the utility model has the beneficial effects that: compared with the prior art, the corrosion-resistant film layer and the heat conducting layer are additionally arranged, the problems that in the process of assembling and operating the lithium ion battery, electrolyte in the battery inner core corrodes the packaging material and heat generated in the battery inner core is difficult to lead out are solved, the battery has good barrier property and heat dissipation, the reliability of the battery is improved, and the service life of the battery is prolonged.
(1) The outer layer of the copolymerization propylene in the aluminum plastic film is compounded with a corrosion resistant film layer, and the corrosion resistant film layer is selected from a polytetrafluoroethylene film, a perfluorosulfonic acid film, a polyvinylidene fluoride film and a polyvinyl chloride film which have excellent chemical stability, corrosion resistance, sealing property, electrical insulating property and good ageing resistance, so that the corrosion of electrolyte to the aluminum foil can be prevented, the barrier property of the aluminum foil is protected, and the short circuit of a battery is prevented;
(2) by the film forming method of spraying, vacuum filtration, spin-coating and blow molding, the double surfaces of the aluminum foil are coated and compounded with graphene films, graphite films, carbon fiber films, carbon nanotube films, diamond powder films, silicon-based films, silver-based films, gold-based films or copper-based films with larger heat conductivity coefficients, so that the heat of the inner core of the battery can be quickly led out, and the rapid failure risk of the battery is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
in the figure: 1. a copolymerized propylene layer CPP; 2. a first adhesive layer; 3. a corrosion resistant film layer; 4. a second adhesive layer; 5. a heat conductive layer; 6. an aluminum foil layer AL; 7. a third adhesive layer; 8. and a heat dissipation layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1, in a first embodiment provided by the present invention, a corrosion-resistant and heat-dissipating aluminum-plastic film for packaging a polymer lithium ion battery is prepared, and the film is formed by stacking a plurality of films, wherein the films sequentially include a 40um co-polypropylene layer CPP1, a 6um first adhesive layer 2, a 30um corrosion-resistant layer 3, a 6um second adhesive layer 4, a 20um heat conduction layer 5, a 50um aluminum foil layer AL6, a 6um third adhesive layer 7, and a 50um heat dissipation layer 8;
firstly, carrying out plasma treatment on an aluminum foil to prepare a 50um aluminum foil layer AL6, and then coating a 20um graphene film with high heat conductivity coefficient on one side of the aluminum foil layer AL6 to serve as a heat conduction layer 5; then, mixing, melting, extruding and blow molding silver powder serving as heat dissipation filler with polyethylene glycol terephthalate in a ratio of 15:100 to prepare a 50um silver-based film heat dissipation layer 8; the corrosion resistant film layer 3 is a polytetrafluoroethylene film of 30 um; then respectively carrying out plasma corona treatment on the composite surface of the copolymerized propylene layer CPP1, the composite surface of the heat dissipation layer 8 and the two surfaces of the corrosion-resistant film layer 3; and finally, roll coating an adhesive on the co-polypropylene layer CPP1, the corrosion-resistant film layer 3, the aluminum foil layer AL6 and the heat dissipation layer 8, thermally compounding the film layers, and drying to prepare the corrosion-resistant and heat dissipation aluminum-plastic film for packaging the polymer lithium ion battery.
The first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 7 are made of one or a combination of more than two of a single-component polyurethane adhesive, a double-component polyurethane adhesive, a polyacrylic resin adhesive, a polyvinyl acetate adhesive, a urea-formaldehyde resin adhesive and an epoxy resin adhesive, the adhesive bonding mode adopts a cross-linking and curing mode of-OH and-NCO for composite bonding, and the thickness is 1-6 um.
The corrosion-resistant film layer 3 is one or a combination of two or more of polytetrafluoroethylene film, perfluorosulfonic acid film, polyvinylidene fluoride film and polyvinyl chloride film material, and the corrosion-resistant film layer 3 is preferably the polytetrafluoroethylene film or the polyvinylidene fluoride film because the polytetrafluoroethylene film or the polyvinylidene fluoride film has the characteristics of excellent chemical stability, corrosion resistance, sealing property, good ageing resistance, excellent electrical property and the like, does not absorb water, and is a common solid insulating material with small dielectric constant and dielectric loss.
The heat conduction layer 5 is one of a graphene film, a graphite film, a carbon fiber film, a carbon nanotube film, a diamond powder film, a silicon-based film, a silver-based film, a gold-based film or a copper-based film, and the film forming method is one of a spraying method, a vacuum filtration method and a spin coating method.
The heat dissipation layer 8 is one of graphene film, graphite film, carbon fiber film, carbon nanotube film, diamond powder film, silicon-based film, silver-based film, gold-based film or copper-based film which is prepared by mixing, melting, extruding and blow molding one of heat dissipation fillers graphene, graphite, carbon fiber, carbon nanotube, diamond powder, carbon fiber, carbon nanotube film and polyethylene terephthalate, and the mass ratio of the heat dissipation fillers to the resin matrix is 3-20: 100, the thickness of the heat dissipation layer 8 is 10-60 um; the mass ratio of the heat-dissipating filler to the resin matrix is more preferably 10-15:100, and the thickness is more preferably 20-30 um. The heat dissipation filler of the heat dissipation layer 8 of the present embodiment is preferably silver powder because silver is a metal material, which is excellent in thermal conductivity and ductility; the polyethylene terephthalate is preferably selected as the resin matrix because the polyethylene terephthalate has excellent physical and mechanical properties in a wider temperature range, excellent electrical insulation, fatigue resistance, friction resistance and good mechanical properties, the impact strength is 3-5 times that of other films, and the polyethylene terephthalate is resistant to acid and alkali solvents and is very suitable for being used as a heat dissipation layer of an aluminum plastic film for packaging a lithium battery;
compared with the existing aluminum-plastic film, the corrosion-resistant and heat-dissipation aluminum-plastic film for packaging the lithium ion battery has the advantages that the corrosion resistance and the heat dissipation performance are excellent, the corrosion of electrolyte in the battery inner core to packaging materials can be prevented, heat in the inner core can be rapidly led out, the application environment range is the most extensive, the aluminum-plastic film is particularly suitable for extreme conditions of harsh battery use environment, and the safety guarantee can be provided for the stable operation of the battery.
Referring to fig. 1, according to a second embodiment of the present invention, a corrosion-resistant and heat-dissipating aluminum-plastic film for packaging a polymer lithium ion battery is prepared, which is formed by stacking a plurality of films, wherein the films sequentially include a 30um co-polypropylene layer CPP1, a 2um first adhesive layer 2, a 20um corrosion-resistant layer 3, a 2um second adhesive layer 4, a 5um heat conduction layer 5, a 35um aluminum foil layer AL6, a 2um third adhesive layer 7, and a 30um heat dissipation layer 8;
firstly, carrying out plasma treatment on an aluminum foil to prepare an aluminum foil layer AL6 of 35um, and then coating a 5um copper-based film containing high heat conductivity coefficient on one side of the aluminum foil layer AL6 to serve as a heat conduction layer 5; then copper powder is used as a heat dissipation filler to be mixed with polyethylene glycol terephthalate in a ratio of 10:100, and the mixture is blended, co-extruded, granulated and blow-molded to prepare a 30-micron copper-based film heat dissipation layer 8; the corrosion resistant film layer is a polytetrafluoroethylene film of 20 um; then respectively carrying out plasma corona treatment on the composite surface of the copolymerized propylene layer CPP1, the composite surface of the heat dissipation layer 8 and the two surfaces of the corrosion-resistant film layer 3; and finally, performing roll coating of an adhesive on the propylene copolymer layer CPP1, the corrosion-resistant film layer 3, the aluminum foil layer AL6 and the heat dissipation layer 8, performing thermal compounding between films, and drying to prepare the corrosion-resistant and heat dissipation aluminum plastic film for packaging the polymer lithium ion battery.
The materials of the first adhesive layer 2, the second adhesive layer 4 and the third adhesive layer 7 are preferably two-component polyurethane adhesive or epoxy resin adhesive, and the thickness is more preferably 2-5 um.
The copper-based film is preferred for the heat conduction layer 5 because pure copper has high thermal conductivity, is second only to silver and has good ductility, but copper has much lower cost than silver, so the copper-based film is more economical and practical than the silver-based film.
Copper powder is preferable as the heat dissipating filler of the heat dissipating layer 8 because copper powder and silver powder have high thermal conductivities, but silver powder is much more expensive than copper powder, and copper powder is selected as the heat dissipating filler of the heat dissipating layer 8 in the second embodiment for economic reasons.
The corrosion-resistant and heat-dissipation aluminum-plastic film for packaging the lithium ion battery prepared in the second embodiment is better in corrosion resistance and heat dissipation performance compared with the existing aluminum-plastic film, can better prevent the electrolyte in the battery inner core from corroding the packaging material, can quickly conduct heat in the inner core out, is suitable for packaging the lithium ion battery, and has wide adaptability.
Referring to fig. 1, according to a third embodiment of the present invention, a corrosion-resistant and heat-dissipating aluminum-plastic film for packaging a polymer lithium ion battery is prepared, which is formed by stacking a plurality of films, wherein the films sequentially include a 30um co-polypropylene layer CPP1, a 5um first adhesive layer 2, a 25um corrosion-resistant layer 3, a 5um second adhesive layer 4, a 6um heat-conducting layer 5, a 40um aluminum foil layer AL6, a 5um third adhesive layer 7, and a 40um heat-dissipating layer 8;
firstly, carrying out plasma treatment on an aluminum foil to prepare an aluminum foil layer AL6 of 40um, and then coating a 6um copper-based film containing high heat conductivity coefficient on one side of the aluminum foil layer AL6 to serve as a heat conduction layer 5; then copper powder is used as a heat dissipation filler to be mixed with nylon in a ratio of 10:100, and the mixture is blended, co-extruded, granulated and blow-molded to form a 40-micron copper-based film heat dissipation layer 8; the corrosion resistant film layer is a polyvinylidene fluoride film with the thickness of 25 um; then respectively carrying out plasma corona treatment on the composite surface of the copolymerized propylene layer CPP1, the composite surface of the heat dissipation layer 8 and the two surfaces of the corrosion-resistant film layer 3; and finally, roll coating an adhesive on the copolymer propylene layer CPP1, the corrosion-resistant film layer 3, the aluminum foil layer AL6 and the heat dissipation layer 8, thermally compounding the films, and drying to prepare the corrosion-resistant and heat dissipation aluminum-plastic film for packaging the polymer lithium ion battery.
The resin matrix of the heat dissipation layer 8 is preferably nylon because of heat resistance, electrical insulation, high-strength mechanical properties, good high-wear-resistance processing properties and the like, and because the production materials are rich and renewable, the heat dissipation layer is easy to process, and is suitable for being filled with other fillers for reinforcing and modifying, the nylon is widely applied to a plurality of production fields.
The lithium ion battery encapsulation that this embodiment three made compares current plastic-aluminum membrane with corrosion-resistant concurrently thermal diffusivity, and corrosion resistance and heat dispersion are better, can effectually prevent the corruption of electrolyte to packaging material in the battery inner core to derive the heat in the inner core fast, be fit for lithium battery encapsulation, the cost is lower moreover, has better market value.
The above description is only a preferred embodiment of the present invention, and it should be noted that all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Claims (7)
1. The utility model provides a polymer lithium ion battery encapsulation is with corrosion-resistant heat dissipation plastic-aluminum membrane that holds concurrently which characterized in that: the heat-conducting plate comprises a copolymerized propylene layer CPP (1), a first adhesive layer (2), a corrosion-resistant film layer (3), a second adhesive layer (4), a heat-conducting layer (5), an aluminum foil layer AL (6), a third adhesive layer (7) and a heat-radiating layer (8) which are sequentially stacked; the copolymerized propylene layer CPP (1): corrosion-resistant film layer (3): heat-conducting layer (5): aluminum foil layer AL (6): the thickness ratio of the heat dissipation layer (8) is as follows: 1-4: 1: 0.2-1: 1.5-5: 1-6, the thickness of the copolymerized propylene layer CPP (1) is 20-40 mu m, the thickness of the aluminum foil layer AL (6) is 30-50 mu m, and the thicknesses of the first adhesive layer (2), the second adhesive layer (4) and the third adhesive layer (7) are 1-6 mu m.
2. The corrosion-resistant and heat-dissipating aluminum-plastic film for polymer lithium ion battery encapsulation according to claim 1, wherein: the corrosion-resistant film layer (3) is a polytetrafluoroethylene film, a perfluorosulfonic acid film, a polyvinylidene fluoride film or a polyvinyl chloride film, and the thickness of the corrosion-resistant film layer (3) is 10-50 mu m.
3. The corrosion-resistant and heat-dissipating aluminum-plastic film for polymer lithium ion battery encapsulation according to claim 2, wherein: the thickness of the corrosion-resistant film layer (3) is 10-20 μm.
4. The corrosion-resistant and heat-dissipating aluminum-plastic film for polymer lithium ion battery encapsulation according to claim 1, wherein: the heat conducting layer (5) is a graphene film, a graphite film, a carbon fiber film, a carbon nanotube film, a diamond powder film, a silicon-based film, a silver-based film, a gold-based film or a copper-based film, and the thickness of the heat conducting layer (5) is 2-20 micrometers.
5. The corrosion-resistant and heat-dissipating aluminum-plastic film for polymer lithium ion battery encapsulation according to claim 4, wherein: the thickness of the heat conduction layer (5) is 2-6 μm.
6. The corrosion-resistant and heat-dissipating aluminum-plastic film for packaging a polymer lithium ion battery as claimed in claim 1, wherein: the heat dissipation layer (8) is a graphene film, a graphite film, a carbon fiber film, a carbon nanotube film, a diamond powder film, a silicon-based film, a silver-based film, a gold-based film or a copper-based film, and the thickness of the heat dissipation layer (8) is 10-60 mu m.
7. The corrosion-resistant and heat-dissipating aluminum-plastic film for packaging a polymer lithium ion battery as claimed in claim 6, wherein: the thickness of the heat dissipation layer (8) is 10-30 μm.
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| CN202122910186.2U CN216708647U (en) | 2021-11-24 | 2021-11-24 | Corrosion-resistant and heat-dissipation aluminum-plastic film for packaging polymer lithium ion battery |
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| CN202122910186.2U CN216708647U (en) | 2021-11-24 | 2021-11-24 | Corrosion-resistant and heat-dissipation aluminum-plastic film for packaging polymer lithium ion battery |
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