CN110667212A - Soft packaging film for lithium battery - Google Patents

Soft packaging film for lithium battery Download PDF

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Publication number
CN110667212A
CN110667212A CN201910986908.7A CN201910986908A CN110667212A CN 110667212 A CN110667212 A CN 110667212A CN 201910986908 A CN201910986908 A CN 201910986908A CN 110667212 A CN110667212 A CN 110667212A
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CN
China
Prior art keywords
layer
aluminum foil
packaging film
lithium battery
nano
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Pending
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CN201910986908.7A
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Chinese (zh)
Inventor
吕松
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CHANGZHOU SIWEIKE PHOTOVOLTAIC NEW MATERIAL Co Ltd
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CHANGZHOU SIWEIKE PHOTOVOLTAIC NEW MATERIAL Co Ltd
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Priority to CN201910986908.7A priority Critical patent/CN110667212A/en
Publication of CN110667212A publication Critical patent/CN110667212A/en
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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
    • B32B15/04—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
    • B32B15/092—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 epoxy 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
    • B32B15/04—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
    • B32B15/095—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 polyurethanes
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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
    • B32B3/085—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer 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 spaced apart pieces on the surface of a 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings 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
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric 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
    • 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
    • B32B2307/31—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
    • B32B2457/00—Electrical equipment
    • B32B2457/10—Batteries
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention relates to the technical field of battery packaging films, in particular to a flexible packaging film for a lithium battery, which sequentially comprises a reinforcing layer, an aluminum foil layer and a heat sealing layer from outside to inside, and is characterized in that: the reinforced plastic packaging film comprises a reinforcing layer, an aluminum foil layer, a heat-sealing layer, a reinforcing layer, a first bonding layer, a plurality of bulges, a plurality of grooves, an acid corrosion resistant layer and a plurality of grooves, wherein the reinforcing layer is connected with the aluminum foil layer through the first bonding layer, the plurality of bulges are arranged on the contact surface of the reinforcing layer and the aluminum foil layer, and the acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer and the heat-sealing layer.

Description

Soft packaging film for lithium battery
Technical Field
The invention relates to the technical field of battery packaging films, in particular to a flexible packaging film for a lithium battery.
Background
The packaging of lithium ion batteries is divided into two categories, one is a soft package battery cell and the other is a metal shell battery cell. The metal shell battery core comprises a steel shell, an aluminum shell, a cylinder, a square and the like.
The packaging material and the structure of the soft package battery enable the soft package battery to have a series of advantages, for example, the safety performance is good, the soft package battery is packaged by an aluminum plastic film structurally, and when safety problems occur, the soft package battery generally can be blown and cracked, and explosion is not caused like a steel shell or an aluminum shell battery cell; the weight of the soft package battery is 40% lighter than that of a steel shell lithium battery with the same capacity, and is 20% lighter than that of an aluminum shell lithium battery; the internal resistance is small, the internal resistance of the soft package battery is smaller than that of a lithium battery, and the self power 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 an aluminum shell; the design is flexible, the appearance can be changed into any shape, the thickness can be thinner, and the novel battery cell model can be developed according to the customization of the requirements of customers.
The aluminum plastic film generally comprises three layers, namely a nylon layer, a metal aluminum foil layer and a polypropylene layer, wherein the nylon layer is used for blocking air, particularly oxygen, from permeating, the metal aluminum foil layer is used for preventing water from permeating, and the polypropylene layer is used for heat sealing of the battery. Since the electrolyte used by the lithium battery contains lithium hexafluorophosphate, the compound is unstable, strong acid can be decomposed when the lithium battery is heated from the outside and invaded by moisture, and meanwhile, a certain amount of strong-solubility micromolecular organic solvent and inorganic solvent are contained in the electrolyte, and the solvents can destroy the stability of the inner-layer heat-sealing material, thereby influencing the inner-layer structure and the packaging structure of the flexible packaging film layer.
Disclosure of Invention
The purpose of the invention is: overcomes the defects in the prior art, and provides the flexible packaging film for the lithium battery, which has strong corrosion resistance and long composite strength retention time of the packaging film.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a soft packaging film for lithium cell includes enhancement layer, aluminium foil layer and heat-seal layer from outer to interior in proper order, connect through the tie coat between enhancement layer and the aluminium foil layer, there are a plurality of archs on the contact surface on enhancement layer and aluminium foil layer, there are a plurality of recesses on the contact surface on aluminium foil layer and enhancement layer, the coating has acid-resistant corrosion layer on the contact surface on aluminium foil layer and heat-seal layer.
Further, the reinforcing layer is made of nylon 610.
Furthermore, the lower surface of the aluminum foil layer is respectively provided with a plurality of oblique stripes.
Furthermore, the plurality of oblique stripes are parallel to each other, and the inclination angle of the plurality of oblique stripes is 30-60 degrees.
Further, the acid corrosion resistant layer comprises a nano inorganic component and polyacrylic acid, and the addition amount of the nano inorganic component is 1-3% of that 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 3:1: 1-2.
Further, the thickness of the acid corrosion resistant layer is 100-300 nm.
Further, the thickness of the aluminum foil layer is 30-40 μm.
Further, the adhesive layer is polyurethane modified epoxy resin or EVA resin, and the thickness of the adhesive layer is 1-3 μm.
Further, the heat sealing layer is made of polyurethane modified epoxy resin or EVA resin, and the thickness of the heat sealing layer is 40-80 μm.
The technical scheme adopted by the invention has the beneficial effects that:
according to the invention, the contact surface of the reinforcing layer and the aluminum foil layer is provided with the plurality of bulges, and the contact surface of the aluminum foil layer and the reinforcing layer is provided with the plurality of grooves, so that the infiltration volume of the reinforcing layer and the aluminum foil layer in the first bonding layer is increased, namely, the contact area between the reinforcing layer and the aluminum foil layer is increased, the bonding strength between the layers is improved, the separation between the layers is avoided in the use process, and the acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer and the heat sealing layer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein,
fig. 1 is a schematic view of a layer structure of a flexible packaging film for a lithium battery according to the present invention.
In the figure: 1 reinforcing layer, 1-1 protrusion, 2 bonding layer, 3 aluminum foil layer, 3-1 groove, 3-2 oblique stripe and 4 heat sealing layer.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
As shown in fig. 1, the flexible packaging film for the lithium battery sequentially comprises a reinforcing layer 1, an aluminum foil layer 3 and a heat sealing layer 4 from outside to inside, wherein the reinforcing layer 1 is connected with the aluminum foil layer 3 through a first bonding layer 2, a plurality of protrusions 1-1 are arranged on the contact surface of the reinforcing layer 1 and the aluminum foil layer 3, a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the reinforcing layer 1, and an acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer 3 and the heat sealing layer 4. In the invention, a plurality of bulges 1-1 are arranged on the contact surface of the reinforcing layer 1 and the aluminum foil layer 3, and a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the reinforcing layer 1, the main purpose is to increase the infiltration volume of the reinforcing layer 1 and the aluminum foil layer 3 in the bonding layer 2, namely, the contact area between the reinforcing layer 1 and the aluminum foil layer 3 is increased, thereby improving the bonding strength between the layers, avoiding the separation between the layers of the packaging film in the use process, the contact surface of the aluminum foil layer 3 and the heat sealing layer 4 is coated with the acid corrosion resistant layer, on one hand, the acid corrosion resistant layer is high in bonding strength and in close contact with the aluminum foil layer 3, the probability of separation between the layers is further reduced, on the other hand, the acid corrosion resistant layer is coated to directly form a compact protective film layer on the surface of the aluminum foil layer 3, and the protective effect is obvious.
As a preferred embodiment of the present invention, the lower surface of the aluminum foil layer 3 has a plurality of oblique stripes 3-2, and the structural design of the oblique stripes 3-2 significantly improves the friction between the aluminum foil layer 3 and the heat seal layer 4 and between the aluminum foil layer and the battery, improves the connection strength, and improves the packaging effect of the packaging film. The preferred scheme is as follows: the oblique stripes 3-2 are parallel to each other, and the inclination angle of the oblique stripes 3-2 is 30-60 degrees.
As a preferred embodiment in the invention, the acid corrosion resistant layer comprises a nano inorganic component and polyacrylic acid, wherein the addition amount of the nano inorganic component is 1-3% of that of the polyacrylic acid, and the acid corrosion resistant layer made of the material improves the acid corrosion resistance of the packaging film, prolongs the service life of the packaging film and prolongs the service life of the battery. The preferred scheme is as follows: the nano inorganic components comprise 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 3:1: 1-2.
As a preferred embodiment of the present invention, the thickness of the acid-corrosion-resistant layer is 100-300 nm.
As a preferred embodiment of the present invention, the thickness of the aluminum foil layer 3 is 30 to 40 μm.
In a preferred embodiment of the present invention, the adhesive layer 2 is a urethane-modified epoxy resin or an EVA resin, the thickness of the adhesive layer 2 is 1 to 3 μm, and the epoxy resin has certain moisture absorption, so the urethane-modified epoxy resin or the EVA resin is used as the adhesive layer 2 in the present invention to reduce the permeability of moisture.
As a preferred embodiment of the invention, the heat sealing layer 4 is polyurethane modified epoxy resin or EVA resin, and the thickness of the heat sealing layer 4 is 40-80 μm. Because the epoxy resin has certain hygroscopicity, the polyurethane modified epoxy resin or the EVA resin is adopted as the heat sealing layer 4 in the invention to reduce the permeability of water vapor.
Example 1
A soft packaging film for a lithium battery sequentially comprises an enhancement layer 1, an aluminum foil layer 3 and a heat sealing layer 4 from outside to inside, wherein the enhancement layer 1 is connected with the aluminum foil layer 3 through a bonding layer 2, a plurality of protrusions 1-1 are arranged on the contact surface of the enhancement layer 1 and the aluminum foil layer 3, a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the enhancement layer 1, a plurality of oblique stripes 3-2 are respectively arranged on the lower surface of the aluminum foil layer 3, the oblique stripes 3-2 are parallel to each other, the inclination angle of the oblique stripes 3-2 is 30 degrees, an acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer 3 and the heat sealing layer 4, the acid corrosion resistant layer comprises nano inorganic components and polyacrylic acid, the addition amount of the nano inorganic components is 1 percent of the polyacrylic acid, the nano inorganic components comprise nano aluminum oxide, nano zirconium oxide and nano, the mass ratio of the components is 3:1:1.
Wherein the thickness of the acid corrosion resistant layer is 100 nm.
The thickness of the aluminum foil layer 3 was 30 μm.
Wherein the bonding layer 2 is polyurethane modified epoxy resin, and the thickness of the bonding layer 2 is 1 μm.
Wherein the heat sealing layer 4 is made of polyurethane modified epoxy resin, and the thickness of the heat sealing layer 4 is 40 μm.
Example 2
A soft packaging film for a lithium battery sequentially comprises an enhancement layer 1, an aluminum foil layer 3 and a heat sealing layer 4 from outside to inside, wherein the enhancement layer 1 is connected with the aluminum foil layer 3 through a bonding layer 2, a plurality of protrusions 1-1 are arranged on the contact surface of the enhancement layer 1 and the aluminum foil layer 3, a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the enhancement layer 1, a plurality of oblique stripes 3-2 are respectively arranged on the lower surface of the aluminum foil layer 3, the oblique stripes 3-2 are parallel to each other, the inclination angle of the oblique stripes 3-2 is 35 degrees, an acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer 3 and the heat sealing layer 4, the acid corrosion resistant layer comprises nano inorganic components and polyacrylic acid, the addition amount of the nano inorganic components is 1.5 percent of the polyacrylic acid, the nano inorganic components comprise nano aluminum oxide, nano zirconium oxide and nano, the mass ratio of the components is 3:1: 1.2.
Wherein the thickness of the acid corrosion resistant layer is 120 nm.
The thickness of the aluminum foil layer 3 was 35 μm.
Wherein the bonding layer 2 is polyurethane modified epoxy resin, and the thickness of the bonding layer 2 is 1.5 mu m.
Wherein the heat sealing layer 4 is polyurethane modified epoxy resin, and the thickness of the heat sealing layer 4 is 45 μm.
Example 3
A soft packaging film for a lithium battery sequentially comprises an enhancement layer 1, an aluminum foil layer 3 and a heat sealing layer 4 from outside to inside, wherein the enhancement layer 1 is connected with the aluminum foil layer 3 through a bonding layer 2, a plurality of protrusions 1-1 are arranged on the contact surface of the enhancement layer 1 and the aluminum foil layer 3, a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the enhancement layer 1, a plurality of oblique stripes 3-2 are respectively arranged on the lower surface of the aluminum foil layer 3, the oblique stripes 3-2 are parallel to each other, the inclination angle of the oblique stripes 3-2 is 45 degrees, an acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer 3 and the heat sealing layer 4, the acid corrosion resistant layer comprises nano inorganic components and polyacrylic acid, the addition amount of the nano inorganic components is 2 percent of the polyacrylic acid, the nano inorganic components comprise nano aluminum oxide, nano zirconium oxide and nano, the mass ratio of the components is 3:1: 1.5.
Wherein the thickness of the acid corrosion resistant layer is 200 nm.
The thickness of the aluminum foil layer 3 was 35 μm.
Wherein the bonding layer 2 is polyurethane modified epoxy resin, and the thickness of the bonding layer 2 is 2 μm.
Wherein the heat sealing layer 4 is polyurethane modified epoxy resin, and the thickness of the heat sealing layer 4 is 50 μm.
Example 4
A soft packaging film for a lithium battery sequentially comprises an enhancement layer 1, an aluminum foil layer 3 and a heat sealing layer 4 from outside to inside, wherein the enhancement layer 1 is connected with the aluminum foil layer 3 through a bonding layer 2, a plurality of protrusions 1-1 are arranged on the contact surface of the enhancement layer 1 and the aluminum foil layer 3, a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the enhancement layer 1, a plurality of oblique stripes 3-2 are respectively arranged on the lower surface of the aluminum foil layer 3, the oblique stripes 3-2 are parallel to each other, the inclination angle of the oblique stripes 3-2 is 55 degrees, an acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer 3 and the heat sealing layer 4, the acid corrosion resistant layer comprises nano inorganic components and polyacrylic acid, the addition amount of the nano inorganic components is 2.5 percent of the polyacrylic acid, the nano inorganic components comprise nano aluminum oxide, nano zirconium oxide and nano, the mass ratio of the components is 3:1: 1.8.
Wherein the thickness of the acid corrosion resistant layer is 250 nm.
The thickness of the aluminum foil layer 3 was 35 μm.
Wherein the adhesive layer 2 is EVA resin, and the thickness of the adhesive layer 2 is 2.5 μm.
Wherein the heat sealing layer 4 is EVA resin, and the thickness of the heat sealing layer 4 is 60 μm.
Example 5
A soft packaging film for a lithium battery sequentially comprises an enhancement layer 1, an aluminum foil layer 3 and a heat sealing layer 4 from outside to inside, wherein the enhancement layer 1 is connected with the aluminum foil layer 3 through a first bonding layer 2, a plurality of protrusions 1-1 are arranged on the contact surface of the enhancement layer 1 and the aluminum foil layer 3, a plurality of grooves 3-1 are arranged on the contact surface of the aluminum foil layer 3 and the enhancement layer 1, the lower surface of the aluminum foil layer 3 is respectively provided with a plurality of oblique stripes 3-2, the oblique stripes 3-2 are parallel to each other, the inclination angle of the oblique stripes 3-2 is 60 degrees, an acid-corrosion-resistant layer is coated on the contact surface of the aluminum foil layer 3 and the heat sealing layer 4, the acid-corrosion-resistant layer comprises nano inorganic components and polyacrylic acid, the addition amount of the nano inorganic components is 3 percent of the polyacrylic acid, the nano inorganic components comprise nano aluminum oxide, nano zirconium, the mass ratio of the components is 3:1: 2.
Wherein the thickness of the acid corrosion resistant layer is 300 nm.
The thickness of the aluminum foil layer 3 was 40 μm.
Wherein the adhesive layer 2 is EVA resin, and the thickness of the adhesive layer 2 is 3 μm.
Wherein the heat sealing layer 4 is made of poly EVA resin, and the thickness of the heat sealing layer 4 is 80 μm.
According to the invention, the contact surface of the reinforcing layer and the aluminum foil layer is provided with the plurality of bulges, and the contact surface of the aluminum foil layer and the reinforcing layer is provided with the plurality of grooves, so that the infiltration volume of the reinforcing layer and the aluminum foil layer in the first bonding layer is increased, namely, the contact area between the reinforcing layer and the aluminum foil layer is increased, the bonding strength between the layers is improved, the separation between the layers is avoided in the use process, and the acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer and the heat sealing layer.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement 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 content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. The utility model provides a soft packaging film for lithium cell includes enhancement layer, aluminium foil layer and heat-seal layer, its characterized in that from outside to inside in proper order: the reinforced layer is connected with the aluminum foil layer through an adhesive layer, a plurality of bulges are arranged on the contact surface of the reinforced layer and the aluminum foil layer, a plurality of grooves are arranged on the contact surface of the aluminum foil layer and the reinforced layer, and an acid corrosion resistant layer is coated on the contact surface of the aluminum foil layer and the heat sealing layer.
2. The flexible packaging film for a lithium battery as claimed in claim 1, wherein: the reinforcing layer is made of nylon 610.
3. The flexible packaging film for a lithium battery as claimed in claim 1, wherein: the lower surface of the aluminum foil layer is provided with a plurality of oblique stripes respectively.
4. The flexible packaging film for a lithium battery as claimed in claim 3, wherein: the plurality of oblique stripes are parallel to each other, and the inclination angles of the oblique stripes are 30-60 degrees.
5. The flexible packaging film for a lithium battery as claimed in claim 1, wherein: the acid corrosion resistant layer comprises a nano inorganic component and polyacrylic acid, and the addition amount of the nano inorganic component is 1-3% of that of the polyacrylic acid.
6. The flexible packaging film for a lithium battery as claimed in 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 3:1: 1-2.
7. The flexible packaging film for a lithium battery as claimed in claim 5, wherein: the thickness of the acid corrosion resistant layer is 100-300 nm.
8. The flexible packaging film for a lithium battery as claimed in claim 1, wherein: the thickness of the aluminum foil layer is 30-40 μm.
9. The flexible packaging film for a lithium battery as claimed in claim 1, wherein: the adhesive layer is polyurethane modified epoxy resin or EVA resin, and the thickness of the adhesive layer is 1-3 μm.
10. The flexible packaging film for a lithium battery as claimed in claim 1, wherein: the heat sealing layer is made of polyurethane modified epoxy resin or EVA resin, and the thickness of the heat sealing layer is 40-80 mu m.
CN201910986908.7A 2019-10-17 2019-10-17 Soft packaging film for lithium battery Pending CN110667212A (en)

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CN111331988A (en) * 2020-03-31 2020-06-26 常州斯威克光伏新材料有限公司 Battery core flexible packaging film
CN111361250A (en) * 2020-04-13 2020-07-03 常州斯威克光伏新材料有限公司 Double-sided heat-sealing flexible packaging film for lithium battery
CN111244336A (en) * 2020-04-13 2020-06-05 常州斯威克光伏新材料有限公司 Impact-resistant flexible packaging film for lithium battery
CN111376555A (en) * 2020-04-13 2020-07-07 常州斯威克光伏新材料有限公司 High-temperature-resistant insulating flexible packaging film for lithium battery
CN111244337A (en) * 2020-04-13 2020-06-05 常州斯威克光伏新材料有限公司 Soft packaging film for lithium battery with high peel strength
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CN111430586A (en) * 2020-05-01 2020-07-17 常州斯威克光伏新材料有限公司 High-buffer packaging film for lithium battery
CN111430587A (en) * 2020-05-01 2020-07-17 常州斯威克光伏新材料有限公司 Graphene flexible packaging film for lithium ion battery
CN111421915A (en) * 2020-05-01 2020-07-17 常州斯威克光伏新材料有限公司 Anti-deformation packaging film for lithium battery
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Application publication date: 20200110