CN108045026A - Fire-retardant lithium battery encapsulation composite membrane of a kind of high water resistant and preparation method thereof - Google Patents
Fire-retardant lithium battery encapsulation composite membrane of a kind of high water resistant and preparation method thereof Download PDFInfo
- Publication number
- CN108045026A CN108045026A CN201711290404.9A CN201711290404A CN108045026A CN 108045026 A CN108045026 A CN 108045026A CN 201711290404 A CN201711290404 A CN 201711290404A CN 108045026 A CN108045026 A CN 108045026A
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- China
- Prior art keywords
- layer
- composite membrane
- thickness
- lithium battery
- fire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000012528 membrane Substances 0.000 title claims abstract description 47
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 23
- 239000003063 flame retardant Substances 0.000 title claims abstract description 21
- 238000005538 encapsulation Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title description 8
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 24
- -1 polypropylene Polymers 0.000 claims description 23
- 239000004743 Polypropylene Substances 0.000 claims description 20
- 229920001155 polypropylene Polymers 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 150000001875 compounds Chemical class 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
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- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 claims description 9
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- 239000011265 semifinished product Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 5
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 5
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
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- 229910044991 metal oxide Inorganic materials 0.000 claims 1
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- 239000002994 raw material Substances 0.000 abstract description 4
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- 238000005260 corrosion Methods 0.000 description 4
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
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- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
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- 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
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Abstract
The present invention improves a kind of fire-retardant lithium battery encapsulation composite membrane of high water resistant; including protective layer, adhesive layer, passivation aluminium foil layer and hot sealing layer; wherein described protective layer is the nylon membrane or polyester film of single or double coating; about 1 ~ 5 μm of thickness of coating; the hot sealing layer seals CPP one layers, about 30 80 μm of thickness for bonding for three-decker, and the three-decker includes cementation layer; supporting role layer seals active layer.The present invention also provides a kind of multilayer lamination techniques for preparing the lithium battery encapsulation composite membrane.Composite membrane prepared by the present invention effectively reduces the water suction of nylon, and enhance the anti-hydrolytic performance of the adhesive layer between aluminium foil, and the technique of multi-layer co-extruded lamination, realize the one-pass molding from raw material to finished product composite membrane, the technique individually produced with binding agent fitting of CPP films is eliminated, effectively reduces production cost and equipment investment.
Description
Technical field
The present invention relates to encapsulating material fields, relate generally to soft package lithium battery encapsulating material field, and in particular to Yi Zhonggao
Lithium battery encapsulation composite membrane for blocking water fire-retardant and preparation method thereof.
Background technology
Lithium ion battery is since its is light-weight, capacity is big, has extended cycle life and the advantages such as memory-less effect, in digital electricity
Subdomains extensive use, it is in recent years, even more fast-developing in emerging fields such as new-energy automobile, energy storage.Traditional lithium battery uses
The rigid materials such as aluminum hull, box hat packaging, in addition to lightweight problem, there is also pressure to cross the security risks such as huge explosion.For
A series of problems existing for lithium battery mental package, a kind of new aluminum-plastic composite membrane packaging material come into being.The packaging material
It is generally formed by trilamellar membrane Material cladding, is protective layer, aluminium foil layer, corrosion-resistant hot sealing layer successively from outside to inside, usual protective layer
It is the nylon membrane of biaxial tension(BOPA films), aluminium foil layer using single or double Passivation Treatment, anti-corrosion layer be cast polypropylene
Film(CPP films).The bonding mode of aluminium foil and outer layer nylon membrane is by adhesive dry-lamination process.Aluminium foil and internal layer CPP films
Bonding mode there are two types of.One kind is that hot pressing is compound, i.e., binder resin is squeezed out lamination in aluminium foil surface using extruder, then
Hot repressing bonds CPP films.Another is aluminium foil surface coating adhesive, then dry out solvent and CPP films progress dry type are compound.
The nylon membrane of outer layer, since itself is hygroscopic, and water preventing ability is poor, more demanding to use environment, and storage life is short,
Agent is sticked also easily because cohesive force reduces caused by hydrolysis the problems such as nylon membrane and interlayer aluminium foil adhesive glue, and nylon membrane itself is fire-retardant
Property it is also bad, battery short circuit, be squeezed etc. trigger it is on fire in the case of, it is impossible to it is effective to ensure safety.
The CPP films of internal layer are compound with aluminium foil, and no matter hot pressing squeezes out compound CPP films or the compound CPP films of adhesive dry type, all
It needs first to buy or prepare CPP films, adds material and process costs.In addition, hot pressing is compound larger there are integral thickness,
Ultrathin encapsulating film problem should not be prepared;Dry type is compound to be needed to face the problems such as solvent is handled.
The content of the invention
For the formation problems of block water anti-flammability deficiency problem and the internal layer CPP film hot sealing layers of conventional protection layers nylon membrane,
The present invention provides a kind of fire-retardant lithium battery encapsulation composite membrane of high water resistant and preparation method and a kind of multilayer lamination technique,
The composite membrane being prepared is fire-retardant with high water resistant, and multilayer lamination technique preparation flow is simple, at low cost.
The first aspect of the present invention provides a kind of fire-retardant lithium battery encapsulation composite membrane of high water resistant, including protective layer,
Adhesive layer, passivation aluminium foil layer and hot sealing layer, wherein the protective layer is the nylon membrane or polyester film of single or double coating, plating
About 1 ~ 5 μm of layer thickness, the hot sealing layer seal CPP one layers for bonding for three-decker, about 30-80 μm of thickness, described three layers
Structure includes cementation layer, and supporting role layer seals active layer.
Further, coating can be metals or the oxides such as aluminium coated, silica, aluminium oxide.
Further, coating forms single-layer or multi-layer coating using being deposited or sputtering mode.
Further, adhesive layer is modified polyester resin, modified polyurethane resin, modified epoxy, modified propylene
One of acid resin, organic siliconresin, polyimide resin or organic fluorine.
Further, the three-decker of hot sealing layer includes:(1)Cementation layer is:Maleic anhydride modified polypropylene 20%-
40%th, acrylic acid modified polypropylene 5%-10%, maleic anhydride modified styrene 5%-10%, copolymer polypropylene 50%-60%, antioxidant
1%-2%, 6-15 μm of thickness;(2)Supporting role layer is:Homopolypropylene 50%-70%, copolymer polypropylene 20%-30%, elastomer
10%-20%, antioxidant 1%-2%, 15-50 μm of thickness;(3)Sealing active layer is:Copolymer polypropylene 60%-70%, elastomer 20%-
40%th, antioxidant 1%-2%, slipping agent 1%-3%, 10-20 μm of thickness.
Further, the ratio between the thickness of supporting role layer with sealing active layer is 3:1-1:1
Further, it is passivated aluminium foil layer and carries out surface passivating treatment using soft aluminium of annealing, and to aluminium foil double spread chromate.
The second aspect of the present invention, which provides a kind of multilayer lamination technique, to be included:Three layers of material of hot sealing layer are respectively with three
Double screw extruder squeezes out, while connects three chamber co-extruding moulds;The material of each extruder is compound in mould outlet, then is cast to
The aluminium foil surface of semi-finished product is stated, cementation layer is bonded with aluminium foil, then compound by multiple roll hot pressing.Wherein each extruder temperature exists
170-200 DEG C or so, mold temperature is at 210-250 DEG C or so, and hot pressing roll temperature is respectively at 80-130 DEG C or so.
The third aspect of the present invention additionally provides a kind of production technology of above-mentioned lithium battery encapsulation composite membrane, including:
(1)Base's aluminium foil layer uses thickness as the soft aluminium of 15-40 μm of annealing, and surface passivation is carried out to aluminium foil double spread chromate
Processing;
(2)The materials such as aluminium, silica, aluminium oxide are plated in thin by nylon membrane or polyester film using conventional vapor deposition or sputtering technology
Film surface, 1-5 μm of thickness of coating;
(3)In one face coating adhesive of aluminium foil layer of passivation, 3-5 μm of adhesive thickness, then with the nylon membrane of two-sided coating
Or polyester film protective layer progress dry type is compound, prepares the semi-finished product of composite membrane, wherein 15-40 μm of the thickness of protective layer;
(4)Lamination hot sealing layer will be squeezed out on the aluminium foil surface of above-mentioned semi-finished product using multilayer lamination technique, hot sealing layer seals to bond
CPP one layers, about 30-80 μm of thickness.For heat sealed package during product final application.
Coating forms single-layer or multi-layer coating using being deposited or sputtering mode.The method of vapor deposition is preferably vacuum evaporation, often
The flow seen is cleaned including ungrease treatment with acetone or alcohol, and surface treatment includes Corona discharge Treatment, ultraviolet light irradiation
Processing etc., bottom-surface coated/cure process(If necessary), vacuum evaporation process.The method of sputtering can be common sputter coating
Method is preferably magnetron sputtering method.Coating material is preferably the metals such as aluminium, silica, aluminium oxide or oxide, wherein considering
Water-fast barriering effect and caking property, the convenience of preparation, preferably by the use of aluminium oxide as coating material.Coating can be with individual layer
Or multilayer, it is preferably multilayered structure, can be realized by repeating sputtering.The thickness of coating is preferably 1-5 μm, blocked up coating
Cause manufacturing cost excessively high, and lower caking property, too small thickness cannot play good barriering effect.
The material of hot sealing layer is three-layer co-extruded composite membrane, including sealing active layer, supporting role layer, cementation layer.It is viscous
Knot active layer primarily serves the effect of cohesive aluminium foil and hot sealing layer.As shown in figure 3, the method for conventional adhesive hot sealing layer and aluminium foil layer
It is to be connected therebetween by adhesive layer.And the present invention passes through the maleic anhydride modified polypropylene of multilayer lamination technology utilization
Based on cementation layer, in one-step shaping technique directly with passivation aluminium foil it is bonding, reduce production craft step, and
Cost is reduced, while avoids the bad corrosion resistance of conventional adhesive.
And supporting role layer primarily serves effect made of endothecium structure, can also play barrier electricity jointly with heat-sealing active layer
Solve the effect of corrosion.Supporting role composition of layer includes:Homopolypropylene 50%-70%, copolymer polypropylene 20%-30%, elastomer
10%-20%, antioxidant 1%-2%.15-50 μm of thickness;And it seals active layer and includes:Copolymer polypropylene 60%-70%, elastomer 20%-
40%th, antioxidant 1%-2%, slipping agent 1%-3%.10-20 μm of thickness.Supporting role layer is mixed with homopolypropylene and copolymer polypropylene
It closes based on object, and seals active layer based on copolymer polypropylene, the physical property performance of the two includes viscosity, mechanical property and solidifying
Solid temperature degree is different, it is achieved thereby that different effects.Supporting role layer and heat-sealing active layer collective effect, play completely isolated electricity
The effect of liquid, and the overall structure of supporting role layer support aluminum plastic film are solved, improves its mechanical property.In order to preferably realize this hair
The ratio between bright effect, thickness of the supporting role layer with sealing active layer is 3:1-1:1, it is preferably 2:1.
The present invention uses multi-layer co-extruded lamination technique, and using all kinds of raw materials, the direct lamination of internal layer CPP hot sealing layers is coated
In the aluminium foil surface of passivation, then hot repressing processing one-pass molding similar to conventional hot-press combination process, but uses more raw materials
Multilayer extrusion, reduce CPP films individually produces technique, effectively reduces cost.
The advantageous effects of the present invention:
(1)The protective layer that the present invention uses is the nylon membrane or polyester film of single or double coating, and coating can be aluminium coated, two
The metals such as silica, aluminium oxide or oxide, using being deposited or sputtering mode forms single-layer or multi-layer coating, thickness of coating about 1 ~
5 microns are differed, the protective layer of coating film treatment, there is the excellent flame retardant type that blocks water.Using containing coated nylon or polyester film, protection
The permeability rate of layer is by 3-5g/m2/ it is reduced to 1g/m for 24 hours2/ following for 24 hours, the water suction of nylon is effectively reduced, and is enhanced and aluminium foil
Between adhesive layer anti-hydrolytic performance.
(2)Hot sealing layer uses the technique of multi-layer co-extruded lamination, realizes the one-pass molding from raw material to finished product composite membrane,
The technique individually produced with binding agent fitting of CPP films is eliminated, effectively reduces production cost and equipment investment.
Description of the drawings
Fig. 1:The structure diagram of the fire-retardant lithium battery encapsulation composite membrane of high water resistant of the invention.
Fig. 2:The structure diagram of the hot sealing layer of the fire-retardant lithium battery encapsulation composite membrane of high water resistant of the invention.
Fig. 3:Conventional structure of composite membrane schematic diagram.
Specific embodiment
With reference to specific embodiment, the present invention will be further described.
According to the formula of table 1, embodiment 1-5 and comparative example 1-5 are prepared according to the following steps
(1)Base's aluminium foil layer uses thickness as the soft aluminium of 30 μm of annealing, and aluminium foil double spread chromate is carried out at surface passivation
Reason;
(2)The materials such as aluminium, silica, aluminium oxide are plated in thin by nylon membrane or polyester film using conventional vapor deposition or sputtering technology
Film surface, 1-5 μm of thickness of coating;
(3)In one face coating adhesive modified epoxy of aluminium foil layer of passivation, 3-5 μm of adhesive thickness, then with two-sided
Nylon membrane or polyester film protective layer the progress dry type of coating are compound, prepare the semi-finished product of composite membrane;
(4)Three layers of material of hot sealing layer:Maleic anhydride modified polypropylene 30%, acrylic acid modified polypropylene 7.5%, maleic anhydride change
Property styrene 7.5%, copolymer polypropylene 53.5%, antioxidant 1.5%;(2)Homopolypropylene 60%, copolymer polypropylene 25%, elastomer
14%th, antioxidant 1%;(3)Copolymer polypropylene 65%, elastomer 35%, antioxidant 2%, slipping agent 3%.It is squeezed respectively with three twin-screws
Go out machine extrusion, while connect three chamber co-extruding moulds;The material of each extruder is compound in mould outlet, then is cast to above-mentioned semi-finished product
Aluminium foil surface, cementation layer with aluminium foil be bonded, it is then compound by multiple roll hot pressing.Each extruder temperature is at 200 DEG C or so, mould
Has temperature at 230 DEG C or so, hot pressing roll temperature is respectively at 90 DEG C or so.
The aluminum plastic film that comparative example 6 is prepared using common preparation method, as shown in Figure 3.
The formula of 1 embodiment of table and comparative example
Aluminum plastic film prepared by above-described embodiment and comparative example is made into 200Ah lithium ion batteries respectively, then according to the industry
Standard GB/T18287-2013 detects the security of lithium ion battery.The results are shown in Table 2.
According to 1037 standards of GB, the water penetration tester test permeable amount through the aluminum plastic film prepared interior for 24 hours is used.Knot
Fruit is as shown in table 2.
The performance test results of 2 embodiment of table and comparative example
Comparative example finds that coating of the present invention is preferably the aluminium oxide of multilayer.Comparative example finds do not having with comparative example 1
In the case of coated, the permeability rate of the product of preparation is very high, while the flame resistance of the battery prepared declines, right with comparative example 6
Than in the case of finding without three layers of hot sealing layer, permeability rate and catches fire rate further raise, and illustrate that coating and three layers of hot sealing layer rise
High performance effect is put forward to collaboration.Comparative example and comparative example 2, find blocked up coating, cannot play instead it is optimal every
Water effect, thus it is speculated that be because blocked up coating causes cohesive force decline between layers not tight enough with ply adhesion so as to cause layer
It is close, permeability rate is caused to raise.Comparative example and comparative example 3,4,5, it is found that supporting layer is existed simultaneously and protected with hot sealing layer needs
It holds in the range of certain proportion in the case of no supporting layer or hot sealing layer, catches fire rate and permeability rate all greatly improve, may
It is because that in the case of supporting layer, the mechanical properties decrease of aluminum plastic film does not cause to be easily broken, without the feelings of hot sealing layer
Condition is easy to cause electrolyte exosmosis, so as to trigger safety issue.
Claims (10)
1. a kind of fire-retardant lithium battery encapsulation composite membrane of high water resistant, it is characterised in that:Including protective layer, adhesive layer, passivation
Aluminium foil layer and hot sealing layer, wherein the protective layer is the nylon membrane or polyester film of single or double coating, about 1 ~ 5 μ of thickness of coating
M, the hot sealing layer bond heat-sealing CPP one layers for three-decker, and about 30-80 μm of thickness, the three-decker is including bonding
Active layer, supporting role layer seal active layer.
2. the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1, it is characterised in that:The coating is
Silica, metal layer or metal oxide layer.
3. the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1, it is characterised in that:The coating is adopted
Single-layer or multi-layer coating is formed with being deposited or sputtering mode.
4. the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1, it is characterised in that:The adhesive
Layer is modified polyester resin, modified polyurethane resin, modified epoxy, acrylic resin modified, organic siliconresin, polyamides are sub-
One of polyimide resin or organic fluorine.
5. the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1, it is characterised in that:The hot sealing layer
Three-decker include:(1)Cementation layer is:Maleic anhydride modified polypropylene 20%-40%, acrylic acid modified polypropylene 5%-
10%th, maleic anhydride modified styrene 5%-10%, copolymer polypropylene 50%-60%, antioxidant 1%-2%, 6-15 μm of thickness;(2)Support
Active layer is:Homopolypropylene 50%-70%, copolymer polypropylene 20%-30%, elastomer 10%-20%, antioxidant 1%-2%, thickness
15-50μm;(3)Sealing active layer is:Copolymer polypropylene 60%-70%, elastomer 20%-40%, antioxidant 1%-2%, slipping agent 1%-
3%, 10-20 μm of thickness.
6. the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 5, it is characterised in that:The hot sealing layer
In, it is 3 that supporting role layer acts on the ratio between layer thickness with heat-sealing:1-1:1.
7. the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1, it is characterised in that:The passivation aluminium
Layers of foil carries out surface passivating treatment using soft aluminium of annealing, and to aluminium foil double spread chromate.
8. a kind of multilayer lamination work for preparing the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1
Skill, it is characterised in that:The multilayer lamination technique includes:Three layers of material of hot sealing layer are squeezed respectively with three double screw extruders
Go out, while connect three chamber co-extruding moulds;The material of each extruder is compound in mould outlet, then is cast to the aluminium foil of above-mentioned semi-finished product
Surface, cementation layer is bonded with aluminium foil, then compound by multiple roll hot pressing.
9. the production technology of the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 8, it is characterised in that:
Each extruder temperature is at 170-200 DEG C or so, and mold temperature is at 210-250 DEG C or so, and hot pressing roll temperature is respectively on a 80-130 DEG C of left side
It is right.
10. a kind of production technology of the fire-retardant lithium battery encapsulation composite membrane of high water resistant according to claim 1, including:
(1)Base's aluminium foil layer uses thickness as the soft aluminium of 15-40 μm of annealing, and surface passivation is carried out to aluminium foil double spread chromate
Processing;
(2)The materials such as aluminium, silica, aluminium oxide are plated in thin by nylon membrane or polyester film using conventional vapor deposition or sputtering technology
Film surface, 1-5 μm of thickness of coating;
(3)In one face coating adhesive of aluminium foil layer of passivation, 3-5 μm of adhesive thickness, then with the nylon membrane of two-sided coating
Or polyester film protective layer progress dry type is compound, prepares the semi-finished product of composite membrane, wherein 15-40 μm of the thickness of protective layer;
(4)Lamination hot sealing layer will be squeezed out on the aluminium foil surface of above-mentioned semi-finished product using multilayer lamination technique, hot sealing layer seals to bond
CPP one layers, about 30-80 μm of thickness;For heat sealed package during product final application.
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CN110041817A (en) * | 2019-04-01 | 2019-07-23 | 乐凯胶片股份有限公司 | Smooth coating fluid, aluminum plastic film and lithium ion battery |
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CN112864501A (en) * | 2019-11-27 | 2021-05-28 | 无锡恩捷新材料科技有限公司 | Packaging material for battery and manufacturing method thereof |
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