CN112721402B - Preparation process of flexible packaging film of power lithium battery - Google Patents

Preparation process of flexible packaging film of power lithium battery Download PDF

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Publication number
CN112721402B
CN112721402B CN202011551995.2A CN202011551995A CN112721402B CN 112721402 B CN112721402 B CN 112721402B CN 202011551995 A CN202011551995 A CN 202011551995A CN 112721402 B CN112721402 B CN 112721402B
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film
parts
polyamide
initiator
crosslinking monomer
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CN112721402A (en
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胡伟
周正发
李汪洋
任凤梅
吴磊
张伟
徐凤锦
刘志强
张德顺
郭浩
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Jieshou Tianhong New Material Co ltd
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Jieshou Tianhong New Material Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/06—Coating with compositions not containing macromolecular substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • B32B2038/0028—Stretching, elongating
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
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    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
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    • C08K3/042—Graphene or derivatives, e.g. graphene oxides
    • 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
    • Y02E60/10—Energy storage using batteries

Abstract

The invention discloses a preparation process of a flexible packaging film of a power lithium battery, which comprises the following raw materials in parts by weight: the preparation process comprises the steps of inner layer film preparation, middle layer film preparation, outer layer film preparation and film compounding, wherein the inner layer has good heat sealing performance and high strength, the middle layer has good ductility, the outermost layer has high barrier property, and the finally prepared composite film simultaneously has the characteristics of corrosion resistance, puncture resistance, high heat sealing strength, high ductility and high barrier.

Description

Preparation process of flexible packaging film of power lithium battery
Technical Field
The invention relates to the technical field of flexible packaging films of lithium batteries, in particular to a preparation process of a flexible packaging film of a power lithium battery.
Background
At present, new energy automobiles, particularly pure electric automobiles, are rapidly developed, and performance indexes such as capacity, safety and the like of a power lithium battery serving as a key component are continuously improved. Compared with the traditional steel shell and aluminum shell package of the power lithium battery, the flexible package of the power lithium battery has the following advantages: the safety performance is good, and the explosion can not happen when the steel shell and the aluminum shell are packaged; the weight is 40% lighter than a steel shell with the same capacity and 20% lighter than an aluminum shell; the capacity is large, and is 10 to 15 percent higher than that of a steel shell battery with the same specification and size, and 5 to 10 percent higher than that of an aluminum shell battery; the internal resistance is small, the minimum internal resistance can be lower than 35mΩ, and the self-consumption of the battery is greatly reduced; the design is flexible, and the device can be thinned, arbitrarily formed into an area and arbitrarily formed into a shape.
The flexible packaging film of the lithium battery is used as a shell of the battery core, and the following basic requirements are required to be met: the flexible packaging film of the power lithium battery is usually composed of an outer layer, an aluminum layer and an inner layer, wherein the inner layer is required to be puncture-resistant, stable in electrolyte resistance and high in insulation, and the whole film is required to be extremely high in barrier property and good in cold stamping formability.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a preparation process of a flexible packaging film of a power lithium battery, which is used for solving the problem that the flexible packaging film of the lithium battery is used as a shell of a battery core and meets the following basic requirements: the flexible packaging film of the power lithium battery is usually composed of an outer layer, an aluminum layer and an inner layer, wherein the inner layer is required to be puncture-resistant, stable in electrolyte resistance and high in insulation, and the film is required to be extremely high in barrier property and good in cold stamping formability.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the preparation process of the flexible packaging film of the power lithium battery comprises the following raw materials in parts by weight: 20-30 parts of an inner film substrate I, 20-30 parts of an inner film substrate II, 20-30 parts of an inner film substrate III, 60-80 parts of polyamide, 25-35 parts of EVOH resin, 50-70 parts of an aluminum foil substrate, 5-10 parts of nano titanium dioxide, 5-10 parts of nano silicon dioxide, 1-3 parts of an additive I, 1-3 parts of an additive II and 3-5 parts of an adhesive;
the preparation process of the flexible packaging film of the power lithium battery comprises the following steps:
firstly, preparing an inner layer film;
step S1: adding polyamide of an inner film substrate I, an inner film substrate II, an inner film substrate III and one third into different extruders, adding an additive I into the polyamide, extruding the polyamide into the same T-shaped die head from different extruders at the temperature of 180-200 ℃, controlling the film forming thickness to be 25-45 mu m, casting the polyamide onto the roll surface of a cooling roll at the temperature of 15-20 ℃ at the speed of 12-14m/min, setting the cooling roll speed to be 12-14m/min, obtaining a primary film, feeding the primary film into a rear cooling roll at the speed of 12-14m/min through a traction wheel, and trimming the primary film at the temperature of 15-20 ℃ to obtain an inner base film;
step S2: compounding the inner layer base film obtained in the step S2 with EVOH resin in an extrusion mode, and controlling the thickness of the EVOH resin layer to be 15-25 mu m to obtain an inner layer film;
secondly, preparing an intermediate layer film;
step S3: coating nano titanium dioxide on an aluminum foil base film, controlling the film thickness to be 40-60 mu m, and obtaining an intermediate layer film after coating;
thirdly, preparing an outer layer film;
step S4: melting and mixing the rest polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the biaxial stretching is performed firstly for two times, and the first longitudinal stretching is 1.6-2.0 times and the second longitudinal stretching is 1.6-2.0 times; transversely stretching the polyamide film subjected to the second longitudinal stretching for 3-4 times, and then coating nano silicon dioxide on the stretched polyamide film, wherein the thickness of the film is controlled to be 35-55 mu m;
fourthly, compounding the membrane;
step S5: and (3) compounding the inner layer film obtained in the first step, the middle layer film obtained in the second step and the outer layer film obtained in the third step by using an adhesive, and obtaining the flexible packaging film of the power lithium battery after the compounding is completed.
Further, the first inner film substrate is prepared by the following steps: adding the ternary polymerization polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, and carrying out micro-crosslinking reaction for 4 hours at the temperature of 85 ℃ to obtain an inner film substrate I, wherein the molar ratio of the ternary polymerization polypropylene to the crosslinking monomer is 1:1, wherein the mass of the initiator is 1% of the total mass of the ternary polymerization polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1:1.
further, the inner film substrate II is prepared by the following steps: adding homo-polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, and carrying out micro-crosslinking reaction for 3.5h at the temperature of 78 ℃ to obtain an inner film substrate II after the reaction is finished, wherein the molar ratio of the homo-polypropylene to the crosslinking monomer is 2:1, wherein the mass of the initiator is 1% of the total mass of the homo-polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1:1.
further, the inner film substrate III is prepared by the following steps: adding the mixed polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, and carrying out micro-crosslinking reaction for 4 hours at the temperature of 80 ℃ to obtain an inner film substrate III, wherein the molar ratio of the mixed polypropylene to the crosslinking monomer is 1:2, the mass of the initiator is 1% of the total mass of the mixed polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1:1.
further, the crosslinking monomer is one or more of pentaerythritol tetraacrylate, glycerol triacrylate, divinylbenzene and tripropenyl isocyanurate, which are mixed according to any proportion, and the initiator is one of dicumyl peroxide (DCP) and 2, 5-dimethyl-2, 5- (di-tert-butyl peroxy) hexane.
Further, the additive I is an antistatic agent and a dispersing agent, and the additive II is a dispersing agent, a leveling agent, a flame retardant, an antistatic agent and an antibacterial agent.
Further, in the first step, the inner film layer takes ternary polymerization polypropylene as an innermost layer, and the outer layer sequentially comprises homopolypropylene, mixed polypropylene and nylon layers.
(III) beneficial effects
The invention provides a preparation process of a flexible packaging film of a power lithium battery, which has the following beneficial effects compared with the prior art: the inner layer film adopts a multilayer coextrusion method to prepare a base film, the heat sealing temperature can be properly reduced by taking ternary polymerization polypropylene as the innermost layer, other layers are sequentially formed by homopolymerization polypropylene, mixed polypropylene, nylon and the like, a small amount of reactive monomers containing 3 or more functional groups such as pentaerythritol tetraacrylate, glycerol triacrylate, divinylbenzene, tripropenyl isocyanurate and the like are added into the raw materials of each polypropylene layer, the base film has the functions of puncture resistance, electrolyte resistance, high barrier property, high insulation and high heat sealing strength, antistatic agent and dispersing agent are added, the strength of the inner layer and the flatness of the film are ensured while the heat sealing performance is good, the middle layer film adopts high-ductility aluminum foil as a base material, the surface of the middle layer film is coated with nano titanium dioxide, and the nano titanium dioxide has the functions of oxidization resistance, strong acid resistance and strong corrosion resistance, the middle layer film meets the requirements of a high-expansion corrosion-resistant aluminum foil middle layer, the outermost layer film is prepared by nylon, and dispersing agents, leveling agents, flame retardants, antistatic agents, antibacterial agents and the like are added, so that the lithium battery has the functions of resisting static electricity, high temperature resistance, bacteria resistance and the like, and because electrolyte of a lithium battery contains lithium salt capable of rapidly generating strong corrosive hydrofluoric acid when meeting water, the defects of expanding gas and the like are caused, the biaxially oriented nylon is adopted, and nano silicon dioxide is coated on the surface of the biaxially oriented nylon, so that the effective barrier to oxygen and water can be realized, the excellent barrier performance is realized, and the finally prepared composite film has the characteristics of corrosion resistance, puncture resistance, high heat sealing strength, high ductility and high barrier, and the following basic requirements are met, so that the lithium battery flexible packaging film is used as a shell of a battery core: the flexible packaging film of the power lithium battery is usually composed of an outer layer, an aluminum layer and an inner layer, wherein the inner layer is required to be puncture-resistant, stable in electrolyte resistance and high in insulation, and the film is required to be extremely high in barrier property and good in cold stamping formability.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation process of the flexible packaging film of the power lithium battery comprises the following raw materials in parts by weight: 20 parts of an inner film substrate, 60 parts of polyamide, 25 parts of EVOH resin, 50 parts of an aluminum foil substrate, 5 parts of nano titanium dioxide, 5 parts of nano silicon dioxide, 1 part of an additive, and 3 parts of an adhesive;
the preparation process of the flexible packaging film of the power lithium battery comprises the following steps:
firstly, preparing an inner layer film;
step S1: adding polyamide of an inner film substrate I, an inner film substrate II, an inner film substrate III and one third into different extruders, adding an additive I into the polyamide, extruding the polyamide into the same T-shaped die head from different extruders at the temperature of 180 ℃, controlling the film forming thickness to be 25 mu m, casting the film onto the roller surface of a cooling roller at the temperature of 15 ℃ at the speed of 12m/min, setting the speed of the cooling roller to be 12m/min, obtaining a primary film, and cutting edges of the primary film at the speed of 12m/min and the temperature of 15 ℃ by a traction wheel after the primary film enters the cooling roller at the speed of 12m/min, so as to obtain an inner base film;
step S2: compounding the inner layer base film obtained in the step S2 with EVOH resin in an extrusion mode, and controlling the thickness of the EVOH resin layer to be 15 mu m to obtain an inner layer film;
secondly, preparing an intermediate layer film;
step S3: coating nano titanium dioxide on an aluminum foil base film, controlling the film thickness to be 40 mu m, and obtaining an intermediate layer film after coating;
thirdly, preparing an outer layer film;
step S4: melting and mixing the rest polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the biaxial stretching is performed for two times, the first longitudinal stretching is 1.6 times, and the second longitudinal stretching is 1.6 times; transversely stretching the polyamide film subjected to the second longitudinal stretching for 3 times, and then coating nano silicon dioxide on the stretched polyamide film, wherein the thickness of the film is controlled to be 35 mu m;
fourthly, compounding the membrane;
step S5: and (3) compounding the inner layer film obtained in the first step, the middle layer film obtained in the second step and the outer layer film obtained in the third step by using an adhesive, and obtaining the flexible packaging film of the power lithium battery after the compounding is completed.
Example 2
The preparation process of the flexible packaging film of the power lithium battery comprises the following raw materials in parts by weight: 25 parts of an inner film substrate, 70 parts of polyamide, 30 parts of EVOH resin, 60 parts of an aluminum foil substrate, 7.5 parts of nano titanium dioxide, 7.5 parts of nano silicon dioxide, 2 parts of an additive and 4 parts of an adhesive;
the preparation process of the flexible packaging film of the power lithium battery comprises the following steps:
firstly, preparing an inner layer film;
step S1: adding polyamide of an inner film substrate I, an inner film substrate II, an inner film substrate III and one third into different extruders, adding an additive I into the polyamide, extruding the polyamide into the same T-shaped die head from different extruders at the temperature of 190 ℃, controlling the film forming thickness to be 35 mu m, casting the film onto the roller surface of a cooling roller at the temperature of 17.5 ℃ at the speed of 13m/min, setting the speed of the cooling roller to be 13m/min, obtaining a primary film, and cutting edges of the primary film at the speed of 13m/min and the temperature of 17.5 ℃ by a cooling roller after the primary film enters a traction wheel at the speed of 13m/min, so as to obtain an inner layer base film;
step S2: compounding the inner layer base film obtained in the step S2 with EVOH resin in an extrusion mode, and controlling the thickness of the EVOH resin layer to be 20 mu m to obtain an inner layer film;
secondly, preparing an intermediate layer film;
step S3: coating nano titanium dioxide on an aluminum foil base film, controlling the film thickness to be 50 mu m, and obtaining an intermediate layer film after coating;
thirdly, preparing an outer layer film;
step S4: melting and mixing the rest polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the biaxial stretching is performed for two times, the first longitudinal stretching is 1.8 times, and the second longitudinal stretching is 1.8 times; transversely stretching the polyamide film subjected to the second longitudinal stretching for 3.5 times, and then coating nano silicon dioxide on the stretched polyamide film, wherein the thickness of the film is controlled to be 45 mu m;
fourthly, compounding the membrane;
step S5: and (3) compounding the inner layer film obtained in the first step, the middle layer film obtained in the second step and the outer layer film obtained in the third step by using an adhesive, and obtaining the flexible packaging film of the power lithium battery after the compounding is completed.
Example 3
The preparation process of the flexible packaging film of the power lithium battery comprises the following raw materials in parts by weight: 30 parts of an inner film substrate I, 30 parts of an inner film substrate II, 30 parts of an inner film substrate III, 80 parts of polyamide, 35 parts of EVOH resin, 70 parts of an aluminum foil substrate, 10 parts of nano titanium dioxide, 10 parts of nano silicon dioxide, 3 parts of an additive I, 3 parts of an additive II and 5 parts of an adhesive;
the preparation process of the flexible packaging film of the power lithium battery comprises the following steps:
firstly, preparing an inner layer film;
step S1: adding polyamide of an inner film substrate I, an inner film substrate II, an inner film substrate III and one third into different extruders, adding an additive I into the polyamide, extruding the polyamide into the same T-shaped die head from different extruders at the temperature of 200 ℃, controlling the film forming thickness to be 45 mu m, casting the film onto the roller surface of a cooling roller at the temperature of 20 ℃ at the speed of 14m/min, setting the speed of the cooling roller to be 14m/min, obtaining a primary film, and cutting edges of the primary film at the speed of 14m/min and the temperature of 20 ℃ by a traction wheel after the primary film enters the cooling roller at the speed of 14m/min, so as to obtain an inner base film;
step S2: compounding the inner layer base film obtained in the step S2 with EVOH resin in an extrusion mode, and controlling the thickness of the EVOH resin layer to be 25 mu m to obtain an inner layer film;
secondly, preparing an intermediate layer film;
step S3: coating nano titanium dioxide on an aluminum foil base film, controlling the film thickness to be 60 mu m, and obtaining an intermediate layer film after coating;
thirdly, preparing an outer layer film;
step S4: melting and mixing the rest polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the biaxial stretching is performed for two times, the first longitudinal stretching is 2.0 times, and the second longitudinal stretching is 2.0 times; transversely stretching the polyamide film subjected to the second longitudinal stretching for 4 times, and then coating nano silicon dioxide on the stretched polyamide film, wherein the thickness of the film is controlled to be 55 mu m;
fourthly, compounding the membrane;
step S5: and (3) compounding the inner layer film obtained in the first step, the middle layer film obtained in the second step and the outer layer film obtained in the third step by using an adhesive, and obtaining the flexible packaging film of the power lithium battery after the compounding is completed.
Comparative example
Power lithium battery packaging soft film commonly used in market
The performance test of examples 1-3 and comparative examples, the water vapor permeation test with reference to GB/T1037-1988, the oxygen permeation test with reference to GB/T19789, the elongation test with reference to GB/T15821-1995, the corrosion resistance test with reference to GB1763-1979, gave the following results:
Figure BDA0002857981190000081
as can be seen from the above table, the packaging flexible films prepared in examples 1 to 3 have low water vapor transmission rate and oxygen transmission rate, can well block water vapor and oxygen, and have good elongation and corrosion resistance compared with the packaging flexible films of comparative examples.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A preparation process of a flexible packaging film of a power lithium battery is characterized by comprising the following steps of: the flexible packaging film of the power lithium battery comprises the following raw materials in parts by weight: 20-30 parts of an inner film substrate I, 20-30 parts of an inner film substrate II, 20-30 parts of an inner film substrate III, 60-80 parts of polyamide, 25-35 parts of EVOH resin, 50-70 parts of an aluminum foil substrate, 5-10 parts of nano titanium dioxide, 5-10 parts of nano silicon dioxide, 1-3 parts of an additive I, 1-3 parts of an additive II and 3-5 parts of an adhesive;
the preparation process of the flexible packaging film of the power lithium battery comprises the following steps:
firstly, preparing an inner layer film;
step S1: adding polyamide of an inner film substrate I, an inner film substrate II, an inner film substrate III and one third into different extruders, adding an additive I into the polyamide, extruding the polyamide into the same T-shaped die head from different extruders at the temperature of 180-200 ℃, controlling the film forming thickness to be 25-45 mu m, casting the polyamide onto the roll surface of a cooling roll at the temperature of 15-20 ℃ at the speed of 12-14m/min, setting the cooling roll speed to be 12-14m/min, obtaining a primary film, feeding the primary film into a rear cooling roll at the speed of 12-14m/min through a traction wheel, and trimming the primary film at the temperature of 15-20 ℃ to obtain an inner base film;
step S2: compounding the inner layer base film obtained in the step S2 with EVOH resin in an extrusion mode, and controlling the thickness of the EVOH resin layer to be 15-25 mu m to obtain an inner layer film;
secondly, preparing an intermediate layer film;
step S3: coating nano titanium dioxide on an aluminum foil base film, controlling the film thickness to be 40-60 mu m, and obtaining an intermediate layer film after coating;
thirdly, preparing an outer layer film;
step S4: melting and mixing the rest polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the biaxial stretching is performed firstly for two times, and the first longitudinal stretching is 1.6-2.0 times and the second longitudinal stretching is 1.6-2.0 times; transversely stretching the polyamide film subjected to the second longitudinal stretching for 3-4 times, and then coating nano silicon dioxide on the stretched polyamide film, wherein the thickness of the film is controlled to be 35-55 mu m;
fourthly, compounding the membrane;
step S5: compounding the inner layer film obtained in the first step, the middle layer film obtained in the second step and the outer layer film obtained in the third step by using an adhesive, and obtaining the flexible packaging film of the power lithium battery after the compounding is completed;
the first inner film substrate is prepared by the following steps: adding the ternary polymerization polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, and carrying out micro-crosslinking reaction for 4 hours at the temperature of 85 ℃ to obtain an inner film substrate I, wherein the molar ratio of the ternary polymerization polypropylene to the crosslinking monomer is 1:1, wherein the mass of the initiator is 1% of the total mass of the ternary polymerization polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1:1, a step of;
the inner film substrate II is prepared by the following steps: adding the homopolymerized polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, and carrying out micro-crosslinking reaction for 3.5 hours at the temperature of 78 ℃ to obtain an inner film substrate II after the reaction is finished, wherein the molar ratio of the homopolymerized polypropylene to the crosslinking monomer is 2:1, wherein the mass of the initiator is 1% of the total mass of the homo-polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1:1, a step of;
the inner film substrate III is prepared by the following steps: adding the mixed polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, and carrying out micro-crosslinking reaction for 4 hours at the temperature of 80 ℃ to obtain an inner film substrate III, wherein the molar ratio of the mixed polypropylene to the crosslinking monomer is 1:2, the mass of the initiator is 1% of the total mass of the mixed polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1:1, a step of;
the additive I is an antistatic agent and a dispersing agent, and the additive II is a dispersing agent, a leveling agent, a flame retardant, an antistatic agent and an antibacterial agent;
the crosslinking monomer is one or more of pentaerythritol tetraacrylate, glycerol triacrylate, divinylbenzene and tripropenyl isocyanurate, and the initiator is one of dicumyl peroxide and 2, 5-dimethyl-2, 5- (di-tert-butyl peroxy) hexane.
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