CN112721402A - 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
CN112721402A
CN112721402A CN202011551995.2A CN202011551995A CN112721402A CN 112721402 A CN112721402 A CN 112721402A CN 202011551995 A CN202011551995 A CN 202011551995A CN 112721402 A CN112721402 A CN 112721402A
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Prior art keywords
film
parts
preparation process
lithium battery
flexible packaging
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CN202011551995.2A
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CN112721402B (en
Inventor
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
    • 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
    • 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
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    • 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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    • 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
    • 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
    • C08J2323/14—Copolymers of propene
    • C—CHEMISTRY; METALLURGY
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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
    • 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
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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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 composite film comprises, by weight, 20-30 parts of a first inner film base material, 20-30 parts of a second inner film base material, 20-30 parts of a third inner film base material, 60-80 parts of polyamide, 25-35 parts of EVOH resin, 50-70 parts of an aluminum foil base film, 5-10 parts of nano titanium dioxide, 5-10 parts of nano silicon dioxide, 1-3 parts of a first additive, 1-3 parts of a second additive and 3-5 parts of an adhesive.

Description

Preparation process of flexible packaging film of power lithium battery
Technical Field
The invention relates to the technical field of lithium battery flexible packaging films, in particular to a preparation process of a power lithium battery flexible packaging film.
Background
At present of the rapid development of new energy, performance indexes such as capacity and safety of new energy automobiles, especially pure electric automobiles, as key components are continuously improved. Compared with the steel shell and aluminum shell package of the traditional power lithium battery at present, the flexible package of the power lithium battery has the following advantages: the safety performance is good, and the explosion can not occur in the packaging of a steel shell and an aluminum shell; the weight is light, 40% lighter than that of a steel shell with the same capacity and 20% lighter than that of an aluminum shell; the capacity is large, and is 10-15% higher than that of a steel shell battery with the same specification and size and 5-10% higher than that of an aluminum shell battery; the internal resistance is small, and the minimum internal resistance can reach below 35m omega, so that the self-power consumption of the battery is greatly reduced; the design is flexible, and the device can be thinned, arbitrarily sized and arbitrarily shaped.
The lithium battery flexible packaging film is used as a shell of a battery core and needs to meet the following basic requirements: the flexible packaging film of the power lithium battery generally comprises an outer layer, an aluminum layer and an inner layer, wherein the inner layer needs to be puncture-resistant, electrolyte-resistant, stable and high-insulation, and the whole film needs to have extremely high barrier property and good cold stamping formability.
Disclosure of Invention
Technical problem to be solved
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 needs to meet the following basic requirements: the flexible packaging film of the power lithium battery generally comprises an outer layer, an aluminum layer and an inner layer, the inner layer needs to be puncture-resistant, electrolyte-resistant, stable and high-insulation, and the whole film needs to have high barrier property and good cold stamping formability.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a preparation process of a flexible packaging film of a power lithium battery comprises the following raw materials in parts by weight: 20-30 parts of a first inner film base material, 20-30 parts of a second inner film base material, 20-30 parts of a third inner film base material, 60-80 parts of polyamide, 25-35 parts of EVOH resin, 50-70 parts of an aluminum foil base film, 5-10 parts of nano titanium dioxide, 5-10 parts of nano silicon dioxide, 1-3 parts of a first additive, 1-3 parts of a second additive 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 the first inner film base material, the second inner film base material, the third inner film base material and one third of polyamide into different extruders, adding the first additive into the polyamide, then 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 on the roll surface of a cooling roller at the temperature of 15-20 ℃ at the speed of 12-14m/min, setting the speed of the cooling roller to be 12-14m/min to obtain a primary film, and cutting the edge of the primary film after the primary film passes through a traction wheel at the speed of 12-14m/min and a post cooling roller at the speed of 12-14m/min and 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 compounding manner, 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 the 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;
step three, preparing an outer layer film;
step S4: melting and mixing the rest of polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the longitudinal stretching is performed twice at first, wherein the longitudinal stretching is performed for the first time by 1.6-2.0 times, and the longitudinal stretching is performed for the second time by 1.6-2.0 times; transversely stretching the polyamide film subjected to the second longitudinal stretching by 3-4 times, and coating the nano silicon dioxide on the stretched polyamide film to control the thickness of the film 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 for the power lithium battery after compounding.
Further, the first inner film substrate is prepared by the following steps: adding the ternary copolymer polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, carrying out micro-crosslinking reaction for 4 hours at the temperature of 85 ℃, and obtaining an inner membrane substrate I after the reaction is finished, wherein the molar ratio of the usage of the ternary copolymer polypropylene to the usage of the crosslinking monomer is 1: 1, the mass of the initiator is 1% of the total mass of the ternary copolymer polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1: 1.
further, the inner film base material II is prepared by the following steps: adding the homopolymerized polypropylene into a double-screw extruder, then adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, carrying out micro-crosslinking reaction for 3.5h at the temperature of 78 ℃, and obtaining an inner membrane substrate II after the reaction is finished, wherein the molar ratio of the consumption of the homopolymerized polypropylene to the consumption of the crosslinking monomer is 2: 1, the mass of the initiator is 1% of the total mass of the homopolymerized polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1: 1.
further, the inner film base material III is prepared by the following steps: adding mixed polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, carrying out micro-crosslinking reaction for 4 hours at the temperature of 80 ℃, and obtaining an inner membrane substrate III after the reaction is finished, 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 a mixture of pentaerythritol tetraacrylate, glycerol triacrylate, divinylbenzene and triacrylate isocyanurate in any proportion, and the initiator is one of dicumyl peroxide (DCP) and 2, 5-dimethyl-2, 5- (di-tert-butylperoxy) hexane.
Furthermore, 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, the inner film layer in the first step uses ternary polymerization polypropylene as an innermost layer, and the outer layer sequentially comprises homopolymerization polypropylene, mixed polypropylene and a nylon layer.
(III) advantageous 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 co-extrusion method to prepare a base film, the ternary copolymer polypropylene is taken as the innermost layer to properly reduce the heat sealing temperature, the homopolymerization polypropylene, the mixed polypropylene, the nylon and the like sequentially form other layers, a small amount of pentaerythritol tetraacrylate glycerol triacrylate, divinylbenzene, triacrylate isocyanurate and other reactive monomers containing more than 3 functional groups are added into the raw materials of each polypropylene layer, the polypropylene layer film has the functions of puncture resistance, electrolyte resistance, high barrier, high insulation and high heat sealing strength, antistatic agent and dispersing agent are added, the heat sealing performance is good, the strength of the inner layer and the flatness of a formed film are ensured, the middle layer film adopts a high-ductility aluminum foil as a base material, and nano-scale titanium dioxide is coated on the surface of the base material, has the functions of oxidation resistance, strong acid resistance and strong corrosion resistance, and can meet the requirements of a high-ductility corrosion-resistant aluminum foil middle layer, outermost membrane adopts the nylon preparation, and add dispersant, flatting agent, fire retardant, antistatic agent and antibacterial agent, make it have antistatic, high temperature resistant, functions such as antibiotic, because contain in the electrolyte of lithium cell and meet lithium salt that moisture can produce strong corrosive hydrofluoric acid rapidly, lead to defects such as flatulence, so adopt biaxial stretching nylon and at surface coating nanometer silica, can realize the effective separation to oxygen and water, good separation performance has, the complex film that finally makes possesses corrosion-resistant simultaneously, resistant puncture, high heat seal intensity, the characteristics of high ductility and high separation, lithium cell flexible packaging film has effectively been solved as the shell of battery core, need satisfy following basic requirement: the flexible packaging film of the power lithium battery generally comprises an outer layer, an aluminum layer and an inner layer, the inner layer needs to be puncture-resistant, electrolyte-resistant, stable and high-insulation, and the whole film needs to have high barrier property and good cold stamping formability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation process of a flexible packaging film of a power lithium battery comprises the following raw materials in parts by weight: 20 parts of a first inner film base material, 20 parts of a second inner film base material, 20 parts of a third inner film base material, 60 parts of polyamide, 25 parts of EVOH resin, 50 parts of an aluminum foil base film, 5 parts of nano titanium dioxide, 5 parts of nano silicon dioxide, 1 part of a first additive, 1 part of a second 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 the first inner film base material, the second inner film base material, the third inner film base material and one third of polyamide into different extruders, adding the first additive into the polyamide, then 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 micrometers, casting the polyamide on the roll 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 to obtain a primary film, and cutting edges of the primary film at the speed of 12m/min and at the temperature of 15 ℃ in a post-cooling roller through a traction wheel at the speed of 12m/min 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 compounding manner, 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 the 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;
step three, preparing an outer layer film;
step S4: melting and mixing the rest of polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the longitudinal stretching is performed twice at first, wherein the longitudinal stretching is performed for the first time by 1.6 times, and the longitudinal stretching is performed for the second time by 1.6 times; transversely stretching the polyamide film subjected to the second longitudinal stretching by 3 times, coating the nano silicon dioxide on the stretched polyamide film, and controlling the thickness of the film 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 for the power lithium battery after compounding.
Example 2
A preparation process of a flexible packaging film of a power lithium battery comprises the following raw materials in parts by weight: 25 parts of a first inner film base material, 25 parts of a second inner film base material, 25 parts of a third inner film base material, 70 parts of polyamide, 30 parts of EVOH resin, 60 parts of an aluminum foil base film, 7.5 parts of nano titanium dioxide, 7.5 parts of nano silicon dioxide, 2 parts of a first additive, 2 parts of a second 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 the first inner film base material, the second inner film base material, the third inner film base material and one third of polyamide into different extruders, adding the first additive into the polyamide, then 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 polyamide on the roll 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 to obtain a primary film, and cutting edges of the primary film after the primary film enters a post-cooling roller at the speed of 13m/min and the temperature of 17.5 ℃ through a traction wheel at the speed of 13m/min 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 compounding manner, 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 the 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 the coating is finished;
step three, preparing an outer layer film;
step S4: melting and mixing the rest of polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the longitudinal stretching is performed twice at first, wherein the longitudinal stretching is performed for the first time by 1.8 times, and the longitudinal stretching is performed for the second time by 1.8 times; transversely stretching the polyamide film subjected to the second longitudinal stretching by 3.5 times, coating the nano silicon dioxide on the stretched polyamide film, and controlling the thickness of the film to be 45 micrometers;
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 for the power lithium battery after compounding.
Example 3
A preparation process of a flexible packaging film of a power lithium battery comprises the following raw materials in parts by weight: 30 parts of a first inner film base material, 30 parts of a second inner film base material, 30 parts of a third inner film base material, 80 parts of polyamide, 35 parts of EVOH resin, 70 parts of an aluminum foil base film, 10 parts of nano titanium dioxide, 10 parts of nano silicon dioxide, 3 parts of a first additive, 3 parts of a second additive 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 the first inner film base material, the second inner film base material, the third inner film base material and one third of polyamide into different extruders, adding the first additive into the polyamide, then 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 micrometers, casting the polyamide on the roll 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 to obtain a primary film, and cutting edges of the primary film after the primary film passes through a traction wheel at the speed of 14m/min and enters a post-cooling roller at the speed of 14m/min and the temperature of 20 ℃ 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 compounding manner, 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 the 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 the coating is finished;
step three, preparing an outer layer film;
step S4: melting and mixing the rest of polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the longitudinal stretching is performed twice at first, wherein the longitudinal stretching is performed for the first time by 2.0 times, and the longitudinal stretching is performed for the second time by 2.0 times; transversely stretching the polyamide film subjected to the second longitudinal stretching by 4 times, coating the nano silicon dioxide on the stretched polyamide film, and controlling the thickness of the film to be 55 micrometers;
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 for the power lithium battery after compounding.
Comparative example
Power lithium battery packaging soft film commonly used in market
The examples 1-3 and comparative examples were tested for performance, for water vapor transmission with reference to GB/T1037-1988, for oxygen transmission with reference to GB/T19789, for elongation with reference to GB/T15821-1995, and for corrosion protection with reference to GB1763-1979, with the following results:
Figure BDA0002857981190000081
as can be seen from the above table, the flexible packaging films prepared in examples 1 to 3 have a lower water vapor transmission amount and oxygen transmission amount than those of the flexible packaging films of comparative examples, can block water vapor and oxygen well, and have good elongation and corrosion resistance.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A preparation process of a flexible packaging film of a power lithium battery is characterized by comprising the following steps: the flexible packaging film for the power lithium battery comprises the following raw materials in parts by weight: 20-30 parts of a first inner film base material, 20-30 parts of a second inner film base material, 20-30 parts of a third inner film base material, 60-80 parts of polyamide, 25-35 parts of EVOH resin, 50-70 parts of an aluminum foil base film, 5-10 parts of nano titanium dioxide, 5-10 parts of nano silicon dioxide, 1-3 parts of a first additive, 1-3 parts of a second additive 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 the first inner film base material, the second inner film base material, the third inner film base material and one third of polyamide into different extruders, adding the first additive into the polyamide, then 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 on the roll surface of a cooling roller at the temperature of 15-20 ℃ at the speed of 12-14m/min, setting the speed of the cooling roller to be 12-14m/min to obtain a primary film, and cutting the edge of the primary film after the primary film passes through a traction wheel at the speed of 12-14m/min and a post cooling roller at the speed of 12-14m/min and 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 compounding manner, 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 the 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;
step three, preparing an outer layer film;
step S4: melting and mixing the rest of polyamide and the additive II, preparing a film, and then performing biaxial stretching, wherein the longitudinal stretching is performed twice at first, wherein the longitudinal stretching is performed for the first time by 1.6-2.0 times, and the longitudinal stretching is performed for the second time by 1.6-2.0 times; transversely stretching the polyamide film subjected to the second longitudinal stretching by 3-4 times, and coating the nano silicon dioxide on the stretched polyamide film to control the thickness of the film 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 for the power lithium battery after compounding.
2. The preparation process of the flexible packaging film for the power lithium battery as claimed in claim 1, wherein the preparation process comprises the following steps: the first inner film base material is prepared by the following steps: adding the ternary copolymer polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, carrying out micro-crosslinking reaction for 4 hours at the temperature of 85 ℃, and obtaining an inner membrane substrate I after the reaction is finished, wherein the molar ratio of the usage of the ternary copolymer polypropylene to the usage of the crosslinking monomer is 1: 1, the mass of the initiator is 1% of the total mass of the ternary copolymer polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1: 1.
3. the preparation process of the flexible packaging film for the power lithium battery as claimed in claim 1, wherein the preparation process comprises the following steps: the inner film base material II is prepared by the following steps: adding the homopolymerized polypropylene into a double-screw extruder, then adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, carrying out micro-crosslinking reaction for 3.5h at the temperature of 78 ℃, and obtaining an inner membrane substrate II after the reaction is finished, wherein the molar ratio of the consumption of the homopolymerized polypropylene to the consumption of the crosslinking monomer is 2: 1, the mass of the initiator is 1% of the total mass of the homopolymerized polypropylene and the crosslinking monomer, and the mass ratio of the graphene to the initiator is 1: 1.
4. the preparation process of the flexible packaging film for the power lithium battery as claimed in claim 1, wherein the preparation process comprises the following steps: the third inner film base material is prepared by the following steps: adding mixed polypropylene into a double-screw extruder, adding a crosslinking monomer, an initiator and graphene into the double-screw extruder, carrying out micro-crosslinking reaction for 4 hours at the temperature of 80 ℃, and obtaining an inner membrane substrate III after the reaction is finished, 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.
5. the preparation process of the flexible packaging film of the power lithium battery as claimed in claims 2 to 4, wherein the preparation process comprises the following steps: the crosslinking monomer is one or more of pentaerythritol tetraacrylate, glycerol triacrylate, divinylbenzene and triacrylate isocyanurate which are mixed according to any proportion, and the initiator is one of dicumyl peroxide and 2, 5-dimethyl-2, 5- (di-tert-butylperoxy) hexane.
6. The preparation process of the flexible packaging film for the power lithium battery as claimed in claim 1, wherein the preparation process comprises the following steps: 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.
7. The preparation process of the flexible packaging film for the power lithium battery as claimed in claim 1, wherein the preparation process comprises the following steps: in the first step, the inner film layer takes ternary polymerization polypropylene as an innermost layer, and the outer layer sequentially comprises homopolymerization polypropylene, mixed polypropylene and a nylon layer.
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