CN111331988B - Flexible packaging film for battery core - Google Patents

Flexible packaging film for battery core Download PDF

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Publication number
CN111331988B
CN111331988B CN202010243435.4A CN202010243435A CN111331988B CN 111331988 B CN111331988 B CN 111331988B CN 202010243435 A CN202010243435 A CN 202010243435A CN 111331988 B CN111331988 B CN 111331988B
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layer
film
packaging film
flexible packaging
nano
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CN111331988A (en
Inventor
吕松
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Changzhou Sveck Photovoltaic New Material Co ltd
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Changzhou Sveck Photovoltaic 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
    • H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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 relates to the technical field of battery packaging films, in particular to a battery core flexible packaging film which comprises a nylon layer, a first bonding layer, an aluminum foil layer, a second bonding layer, a protective layer, a third bonding layer and a heat sealing layer which are sequentially laminated, wherein the surface of the aluminum foil layer is provided with a corrosion-resistant layer, the protective layer is a composite protective layer, the composite protective layer comprises an EVA adhesive film layer and a TPX film layer, and a non-woven fabric layer is arranged between the EVA adhesive film layer and the TPX film layer; according to the invention, the protective layer is arranged, so that the corrosion-resistant layer on the surface of the aluminum foil layer can be powerfully protected, and the corrosion-resistant layer of the packaging film is prevented from being broken after being punched in the battery packaging process, thereby improving the packaging effect and the packaging qualification rate of the packaging film, prolonging the service life of the packaging film and improving the use safety of the battery. The protective layer in the invention adopts the EVA adhesive film layer and the TPX film layer, so that the service life of the packaging film can be further prolonged, and the protective performance of the battery can be improved.

Description

Flexible packaging film for battery core
Technical Field
The invention relates to the technical field of battery packaging films, in particular to a battery core flexible packaging film.
Background
The packaging material and the structure of the soft package battery have a series of advantages, such as good safety performance, the soft package battery is structurally packaged by an aluminum plastic film, and when safety problems occur, the soft package battery generally can be blown to crack and does not explode like a steel shell or an aluminum shell battery core; the weight of the soft package battery is 40% lighter than that of a steel shell lithium battery with the same capacity, and 20% lighter than that of an aluminum shell lithium battery; the internal resistance of the soft package battery is smaller than that of the lithium battery, so that the self-consumption of the battery can be greatly reduced; the cycle performance is good, the cycle life of the soft-package battery is longer, and the cycle attenuation of 100 times is 4% -7% less than that of the aluminum shell; the design is flexible, the appearance can be changed into any shape, the thickness can be thinner, the customization can be realized according to the requirements of customers, and new battery cell models can be developed.
The aluminum plastic film generally has three layers, namely a nylon layer, a metal aluminum foil layer and a polypropylene layer, in order to improve the corrosion resistance of the metal aluminum foil, a corrosion-resistant layer is required to be arranged on the surface of the metal aluminum foil, the corrosion resistance of the metal aluminum foil layer is improved, the existing corrosion-resistant layer is generally an aluminum oxide layer, the texture is relatively fragile, the phenomenon of cracking can be generated when the battery is punched in the packaging process, and the defective rate is improved.
Disclosure of Invention
The purpose of the invention is that: overcomes the defects in the prior art, and provides a battery core flexible packaging film which can not crack after being punched in the battery packaging process and has good packaging effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a battery core flexible packaging film, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, protective layer, third tie coat and the heat-seal layer that stacks gradually and sets up, there is corrosion-resistant layer on the surface on aluminium foil layer, the protective layer is the composite protection layer, the composite protection layer includes EVA glued membrane layer and TPX rete, be equipped with the non-woven fabrics layer between EVA glued membrane layer and the TPX rete.
Further, a water vapor-resistant layer is arranged on the contact surface of the aluminum foil layer and the first bonding layer, and an acid corrosion-resistant layer is arranged on the contact surface of the aluminum foil layer and the second bonding layer.
Further, the water vapor resistant layer is prepared by adopting passivation treatment liquid, and the passivation treatment liquid is chromium-free passivation treatment liquid.
Furthermore, the chromium-free passivation treatment liquid is one of cerium nitrate/hydrogen peroxide, cerium nitrate/potassium permanganate, cerium nitrate/ammonium persulfate/potassium permanganate.
Further, the acid corrosion resistant layer comprises nano inorganic components and polyacrylic acid, and the addition amount of the nano inorganic components is 1.2-1.8% of the polyacrylic acid.
Further, the nano inorganic component comprises nano aluminum oxide, nano zirconium oxide and nano cerium oxide, and the mass ratio of the nano aluminum oxide to the nano zirconium oxide to the nano cerium oxide is 1:1:1-2.
Further, the non-woven fabric layer is provided with a plurality of bulges.
Further, the heat sealing layer is an EVA adhesive film or a polypropylene film layer, and the thickness of the heat sealing layer is 30-60 mu m.
Further, the first adhesive layer, the second adhesive layer and the third adhesive layer adopt one of acid modified polyolefin resin and chlorinated polypropylene resin.
The technical scheme of the invention has the beneficial effects that:
according to the invention, the protective layer is arranged, so that the corrosion-resistant layer on the surface of the aluminum foil layer can be powerfully protected, and the corrosion-resistant layer of the packaging film is prevented from being broken after being punched in the battery packaging process, thereby improving the packaging effect and the packaging qualification rate of the packaging film, prolonging the service life of the packaging film and improving the use safety of the battery. According to the invention, the EVA film layer and the TPX film layer are adopted as the protective layer, the non-woven fabric layer is arranged between the EVA film layer and the TPX film layer, the EVA film has lower water vapor permeability, the TPX film layer has higher high temperature resistance, heat can be generated in the working process of the battery, and the use of the TPX film layer can further prolong the service life of the packaging film and improve the protective performance of the battery.
The non-woven fabric layer is provided with the bulges, and the bulges can play an effective role in buffering, so that the protection of the corrosion-resistant layer on the aluminum foil layer is improved, and the stamping cracking in the battery packaging process is avoided.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof.
The invention discloses a battery core flexible packaging film, which comprises a nylon layer, a first bonding layer, an aluminum foil layer, a second bonding layer, a protective layer, a third bonding layer and a heat sealing layer which are sequentially laminated, wherein a corrosion-resistant layer is arranged on the surface of the aluminum foil layer, the protective layer is a composite protective layer, the composite protective layer comprises an EVA adhesive film layer and a TPX film layer, and a non-woven fabric layer is arranged between the EVA adhesive film layer and the TPX film layer. According to the invention, the EVA film layer and the TPX film layer are adopted as the protective layer, the non-woven fabric layer is arranged between the EVA film layer and the TPX film layer, the EVA film has lower water vapor permeability, the TPX film layer has higher high temperature resistance, heat can be generated in the working process of the battery, and the use of the TPX film layer can further prolong the service life of the packaging film and improve the protective performance of the battery.
As a preferred implementation manner, in this embodiment, the contact surface between the aluminum foil layer and the first bonding layer is provided with a moisture-resistant layer, the contact surface between the aluminum foil layer and the second bonding layer is provided with an acid corrosion-resistant layer, and the moisture-resistant layer and the acid corrosion-resistant layer are provided, so that the corrosion resistance of the aluminum foil layer is further improved, and the service life of the packaging film is prolonged.
As a preferred implementation manner, the water vapor resistant layer in the embodiment is prepared by adopting passivation treatment liquid, wherein the passivation treatment liquid is chromium-free passivation treatment liquid, and the chromium-free passivation treatment liquid is adopted in the invention, so that the environment is protected.
As a preferred embodiment, the chromium-free passivation solution in this example is one of cerium nitrate/hydrogen peroxide, cerium nitrate/potassium permanganate, and cerium nitrate/ammonium persulfate/potassium permanganate, preferably a mixture of cerium nitrate/ammonium persulfate/potassium permanganate.
As a preferred embodiment, the acid etching layer in this example includes a nano inorganic component and polyacrylic acid, and the nano inorganic component is added in an amount of 1.2 to 1.8% of polyacrylic acid.
As a preferred embodiment, the nano inorganic component in this example comprises nano alumina, nano zirconia and nano ceria, and the mass ratio of the nano alumina, the nano zirconia and the nano ceria is 1:1:1-2.
As a preferred embodiment, the non-woven fabric layer in the embodiment is provided with a plurality of bulges, and the bulges can play an effective role in buffering, so that the protection of the corrosion-resistant layer on the aluminum foil layer is improved, and the punching cracking in the battery packaging process is avoided.
As a preferred implementation manner, the sealing layer in this embodiment is an EVA adhesive film or a polypropylene film layer, and the thickness of the heat sealing layer is 30-60 μm.
As a preferred embodiment, the first adhesive layer, the second adhesive layer, and the third adhesive layer in this example use one of an acid-modified polyolefin resin and a chlorinated polypropylene resin.
Example 1
The utility model provides a battery core flexible packaging film, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, protective layer, third tie coat and the heat-seal layer that stacks gradually and sets up, there is corrosion-resistant layer on the surface on aluminium foil layer, the protective layer is composite protective layer, composite protective layer includes EVA glued membrane layer and TPX rete, be equipped with the non-woven fabrics layer between EVA glued membrane layer and the TPX rete, there is a plurality of archs on the non-woven fabrics layer, be equipped with the resistant water vapor layer on aluminium foil layer and the contact surface of first tie coat, there is acid-proof layer on aluminium foil layer and the contact surface of second tie coat, the resistant water vapor layer adopts passivation treatment liquid to make, passivation treatment liquid is chromium-free passivation treatment liquid, chromium-free passivation treatment liquid selects cerium nitrate/hydrogen peroxide, and acid-proof layer includes nanometer inorganic component and polyacrylic acid, the additive amount of nanometer inorganic component is polyacrylic acid 1.2%, and nanometer inorganic component includes nanometer aluminium oxide, nanometer zirconia and nanometer cerium oxide, and its mass ratio is 1:1, EVA glued membrane or polypropylene film layer are selected for use to heat-seal layer thickness is 30 mu m, first tie coat, second tie coat and third tie coat adopt modified resin.
Example 2
The utility model provides a battery core flexible packaging film, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, protective layer, third tie coat and the heat-seal layer that stacks gradually and sets up, there is corrosion-resistant layer on the surface on aluminium foil layer, the protective layer is composite protective layer, composite protective layer includes EVA glued membrane layer and TPX rete, be equipped with the non-woven fabrics layer between EVA glued membrane layer and the TPX rete, there is a plurality of archs on the non-woven fabrics layer, be equipped with the resistant water vapor layer on aluminium foil layer and the contact surface of first tie coat, there is acid-proof layer on aluminium foil layer and the contact surface of second tie coat, the resistant water vapor layer adopts passivation treatment liquid to make, passivation treatment liquid is chromium-free passivation treatment liquid, chromium-free passivation treatment liquid selects cerium nitrate/hydrogen peroxide, and acid-proof layer includes nanometer inorganic component and polyacrylic acid, the additive amount of nanometer inorganic component is polyacrylic acid 1.3%, and nanometer inorganic component includes nanometer aluminium oxide, nanometer zirconia and nanometer cerium oxide, and its mass ratio is 1:1.2, and heat-seal layer selects for use EVA or polypropylene film, the thickness of heat-seal layer is 40 mu m, first tie coat, third tie coat adopts modified resin.
Example 3
The utility model provides a battery core flexible packaging film, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, protective layer, third tie coat and the heat-seal layer that stacks gradually and sets up, there is corrosion-resistant layer on the surface on aluminium foil layer, the protective layer is composite protective layer, composite protective layer includes EVA glued membrane layer and TPX rete, be equipped with the non-woven fabrics layer between EVA glued membrane layer and the TPX rete, there is a plurality of archs on the non-woven fabrics layer, be equipped with the resistant water vapor layer on aluminium foil layer and the contact surface of first tie coat, there is acid corrosion resistant layer on aluminium foil layer and the contact surface of second tie coat, the resistant water vapor layer adopts passivation treatment liquid to make, passivation treatment liquid is chromium-free passivation treatment liquid, chromium-free passivation treatment liquid selects cerium nitrate/potassium permanganate, and acid corrosion resistant layer includes nanometer inorganic component and polyacrylic acid, the additive amount of nanometer inorganic component is polyacrylic acid 1.5%, and nanometer inorganic component includes nanometer aluminium oxide, nanometer zirconium oxide and nanometer cerium oxide, and its mass ratio is 1:1.5, and EVA or polypropylene film layer are selected for use to have thickness of heat-seal layer to be 45 mu m, first tie coat, second tie coat and third tie coat adopt the modified resin.
Example 4
The utility model provides a battery core flexible packaging film, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, protective layer, third tie coat and the heat-seal layer that stacks gradually and sets up, there is corrosion-resistant layer on the surface on aluminium foil layer, the protective layer is composite protective layer, composite protective layer includes EVA glued membrane layer and TPX rete, be equipped with the non-woven fabrics layer between EVA glued membrane layer and the TPX rete, there is a plurality of archs on the non-woven fabrics layer, be equipped with the resistant water vapor layer on aluminium foil layer and the contact surface of first tie coat, there is acid-proof layer on aluminium foil layer and the contact surface of second tie coat, the resistant water vapor layer adopts passivation treatment liquid to make, passivation treatment liquid is chromium-free passivation treatment liquid, and chromium-free passivation treatment liquid selects for the mixture of cerium nitrate/ammonium persulfate/potassium permanganate, and acid-resistant layer includes nanometer inorganic component and polyacrylic acid, nanometer inorganic component's addition is 1.6%, and nanometer inorganic component includes nanometer aluminium oxide, nanometer zirconia and nanometer cerium oxide, and its mass ratio is 1:1.6, heat-seal or polypropylene film thickness, the passivation layer adopts 50 μm to adopt first tie coat, third tie coat and third tie coat.
Example 5
The utility model provides a battery core flexible packaging film, includes nylon layer, first tie coat, aluminium foil layer, second tie coat, protective layer, third tie coat and the heat-seal layer that stacks gradually and sets up, there is corrosion-resistant layer on the surface on aluminium foil layer, the protective layer is composite protective layer, composite protective layer includes EVA glued membrane layer and TPX rete, be equipped with the non-woven fabrics layer between EVA glued membrane layer and the TPX rete, there is a plurality of archs on the non-woven fabrics layer, be equipped with the resistant water vapor layer on aluminium foil layer and the contact surface of first tie coat, there is acid-proof layer on aluminium foil layer and the contact surface of second tie coat, the resistant water vapor layer adopts passivation treatment liquid to make, passivation treatment liquid is chromium-free passivation treatment liquid, chromium-free passivation treatment liquid selects cerium nitrate/ammonium persulfate/potassium permanganate, and acid-proof layer includes nanometer inorganic component and polyacrylic acid, nanometer inorganic component's additive amount is polyacrylic acid 1.8%, and nanometer inorganic component includes nanometer aluminium oxide, nanometer zirconia and nanometer cerium oxide, and its mass ratio is 1:1:2, and heat-seal layer is used to select EVA or polypropylene film, the thickness of heat-seal is 60 mu m, the first tie coat, the second tie coat adopts the third chloridized resin to adopt.
The packaging films in examples 1 to 5 were used for conventional packaging of lithium ion batteries, and then the degree of damage of the corrosion-resistant layer on the aluminum foil layer was checked by detaching the packaging films, and it was found that the corrosion-resistant layer on the aluminum foil layer was effectively protected from damage.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (8)

1. The utility model provides a battery core flexible packaging film which characterized in that: the anti-corrosion protective coating comprises a nylon layer, a first bonding layer, an aluminum foil layer, a second bonding layer, a protective layer, a third bonding layer and a heat sealing layer which are sequentially laminated, wherein the surface of the aluminum foil layer is provided with an anti-corrosion layer, the protective layer is a composite protective layer, the composite protective layer comprises an EVA adhesive film layer and a TPX film layer, and a non-woven fabric layer is arranged between the EVA adhesive film layer and the TPX film layer;
the non-woven fabric layer is provided with a plurality of bulges.
2. The flexible packaging film for battery cells of claim 1, wherein: the contact surface of the aluminum foil layer and the first bonding layer is provided with a water vapor resistant layer, and the contact surface of the aluminum foil layer and the second bonding layer is provided with an acid corrosion resistant layer.
3. The flexible packaging film for battery cells according to claim 2, wherein: the water vapor resistant layer is prepared by adopting passivation treatment liquid, and the passivation treatment liquid is chromium-free passivation treatment liquid.
4. A battery cell flexible packaging film according to claim 3, wherein: the chromium-free passivation treatment liquid is one of cerium nitrate/hydrogen peroxide, cerium nitrate/potassium permanganate and cerium nitrate/ammonium persulfate/potassium permanganate.
5. The flexible packaging film for battery cells according to claim 2, wherein: the acid corrosion resistant layer comprises nano inorganic components and polyacrylic acid, and the addition amount of the nano inorganic components is 1.2-1.8% of the polyacrylic acid.
6. The flexible packaging film for lithium batteries according to claim 5, wherein: the nano inorganic component comprises nano aluminum oxide, nano zirconium oxide and nano cerium oxide, and the mass ratio of the nano aluminum oxide to the nano zirconium oxide to the nano cerium oxide is 1:1:1-2.
7. The flexible packaging film for battery cells of claim 1, wherein: the heat sealing layer is an EVA adhesive film or a polypropylene film layer, and the thickness of the heat sealing layer is 30-60 mu m.
8. The flexible packaging film for battery cells of claim 1, wherein: the first bonding layer, the second bonding layer and the third bonding layer adopt one of acid modified polyolefin resin and chlorinated polypropylene resin.
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US4833010A (en) * 1988-05-02 1989-05-23 Kappler Safety Group Composite chemical barrier fabric
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