CN109461848A - Lithium ion battery flexible packaging film and preparation method thereof - Google Patents
Lithium ion battery flexible packaging film and preparation method thereof Download PDFInfo
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- CN109461848A CN109461848A CN201811089160.2A CN201811089160A CN109461848A CN 109461848 A CN109461848 A CN 109461848A CN 201811089160 A CN201811089160 A CN 201811089160A CN 109461848 A CN109461848 A CN 109461848A
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- ion battery
- packaging film
- lithium ion
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- 239000012785 packaging film Substances 0.000 title claims abstract description 102
- 229920006280 packaging film Polymers 0.000 title claims abstract description 102
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 100
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 238000009459 flexible packaging Methods 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims description 11
- 239000010410 layer Substances 0.000 claims abstract description 206
- 238000009413 insulation Methods 0.000 claims abstract description 80
- 229920000642 polymer Polymers 0.000 claims abstract description 73
- 239000007787 solid Substances 0.000 claims abstract description 73
- 239000000853 adhesive Substances 0.000 claims abstract description 35
- 230000001070 adhesive effect Effects 0.000 claims abstract description 35
- 229920001225 polyester resin Polymers 0.000 claims abstract description 34
- 239000004645 polyester resin Substances 0.000 claims abstract description 34
- 239000005025 cast polypropylene Substances 0.000 claims abstract description 33
- 239000012790 adhesive layer Substances 0.000 claims abstract description 32
- 238000007731 hot pressing Methods 0.000 claims abstract description 18
- 239000007767 bonding agent Substances 0.000 claims description 39
- 239000004743 Polypropylene Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 24
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 22
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 20
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 14
- 238000007711 solidification Methods 0.000 claims description 14
- 230000008023 solidification Effects 0.000 claims description 14
- 229920002521 macromolecule Polymers 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 49
- 229910052744 lithium Inorganic materials 0.000 abstract description 49
- 239000005030 aluminium foil Substances 0.000 abstract description 27
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 20
- -1 first rigid course Substances 0.000 abstract description 12
- 102000004310 Ion Channels Human genes 0.000 abstract description 9
- 239000004020 conductor Substances 0.000 abstract description 9
- 239000010408 film Substances 0.000 description 41
- 229920001155 polypropylene Polymers 0.000 description 29
- 239000004814 polyurethane Substances 0.000 description 22
- 229920002635 polyurethane Polymers 0.000 description 22
- 229910052782 aluminium Inorganic materials 0.000 description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 18
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 15
- 229920006255 plastic film Polymers 0.000 description 14
- 239000002985 plastic film Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 229920000139 polyethylene terephthalate Polymers 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 239000003792 electrolyte Substances 0.000 description 6
- 238000005538 encapsulation Methods 0.000 description 6
- 239000011888 foil Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 238000007766 curtain coating Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000009102 absorption Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 230000005518 electrochemistry Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 206010016766 flatulence Diseases 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- RYNNCVCHGQBRQR-UHFFFAOYSA-N C=C.C1=CC=CC=C1.C=CC=C.C(C=C)#N Chemical group C=C.C1=CC=CC=C1.C=CC=C.C(C=C)#N RYNNCVCHGQBRQR-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920004933 Terylene® Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
A kind of lithium ion battery flexible packaging film, including cast polypropylene film layer, first adhesive layer, first rigid course, solid sandwich layer in polymer insulation, second rigid course, second adhesive phase and polyester resin layer, wherein, first rigid course and the difference hot pressing of the second rigid course are consolidated in polymer insulation on the two sides of sandwich layer, cast polypropylene film layer is bonded together by the first adhesive layer and the first rigid course, polyester resin layer is bonded together by the second adhesive layer and the second rigid course, so, so that the overall structure of lithium ion battery flexible packaging film has both good ductility and hardness, mouldability is more preferable, and eliminate the use of conductive material aluminium foil, it avoids packaging film and the possibility for being shorted and being formed ion channel and electron channel occurs for negative electrode tab, so as to avoid soft bag lithium ionic cell The possibility that electrochemical corrosion occurs, greatly improves the safety and reliability of soft bag lithium ionic cell.
Description
Technical field
The present invention relates to lithium ion battery packaging film field, more particularly to a kind of lithium ion battery flexible packaging film and its
Preparation method.
Background technique
Soft bag lithium ionic cell refers to that liquid lithium ionic cell puts on one layer of polymeric shell, and aluminum plastic film is used in structure
The lithium ion battery of packaging, in the case where security risk occurs, soft bag lithium ionic cell at most only understands air-blowing and splits.
Currently, the wrapping film of soft bag lithium ionic cell is aluminum plastic film, aluminum plastic film is the encapsulation of soft bag lithium ionic cell battery core
Critical material, sealed after monolithic battery assembling with aluminum plastic film, form a battery, aluminum plastic film plays protection content.
The material of the centre of aluminum plastic film is aluminium, always exists electrochemistry using the soft bag lithium ionic cell of aluminum plastic film outer packing
The risk of corrosion, main cause are that the aluminium in aluminum plastic film is electric conductor, are had in encapsulation process by aluminium layer in aluminum plastic film and cathode nickel
The risk that tab is shorted once being shorted occurs that electron channel will be provided for electrochemical corrosion, and in aluminum plastic film heat seal process,
The breakage of polypropylene (PP) is not avoided that that is, ion channel always exists, and such ion channel and electron channel are deposited simultaneously
Electrochemical corrosion is bound to occur.The lithium ion battery that electrochemical corrosion occurs can be sent out quickly in storage and use process
It gives birth to flatulence and last leakage, less serious case can cause lithium ion battery to fail, fire risk even occurs under serious conditions.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, provide that a kind of security performance is higher, and reliability is more
By force, it can prevent soft bag lithium ionic cell from the packaging film and preparation method thereof of electrochemical corrosion occurs.
The purpose of the present invention is achieved through the following technical solutions:
A kind of lithium ion battery flexible packaging film, comprising:
Cast polypropylene film layer；
First adhesive layer, first adhesive layer are adhered on the cast polypropylene film layer；
First rigid course, first rigid course are adhered to first adhesive layer far from the curtain coating poly- third
On the one side of alkene film layer；
Consolidate sandwich layer in polymer insulation, it is separate to be adhered to first rigid course for solid sandwich layer in the polymer insulation
On the one side of first adhesive layer；
Second rigid course, second rigid course are adhered in the polymer insulation solid sandwich layer far from described
On the one side of first rigid course；
Second adhesive phase, it is exhausted far from the macromolecule that the second adhesive phase is adhered to second rigid course
In edge on the one side of solid sandwich layer；
Polyester resin layer, the polyester resin layer are adhered to the second adhesive phase far from second rigid course
One side on；
In one of the embodiments, in the polymer insulation tensile strength of solid sandwich layer be 480Mpa~
2000Mpa, the molecular weight of solid sandwich layer is 10,000~20,000 in the polymer insulation, the density of solid sandwich layer in the polymer insulation
For 0.9~1.1g/cm3；
The tensile strength of first rigid course and second rigid course is in one of the embodiments,
The molecular weight of 45Mpa~2000Mpa, first rigid course and second rigid course is 10,000~200,000, described
The density of first rigid course and second rigid course is 0.9~1.5g/cm3。
The material of solid sandwich layer is PP or ABS in the polymer insulation in one of the embodiments,.
In one of the embodiments, the material of first rigid course be PP, PET, PMMA and ABS at least
It is a kind of.
In one of the embodiments, first rigid course with a thickness of 10um~15um.
In one of the embodiments, the material of second rigid course be PP, PET, PMMA and ABS at least
It is a kind of.
A kind of preparation method of lithium ion battery flexible packaging film, includes the following steps:
Solid sandwich layer in polymer insulation is provided；
After first rigid course is carried out heating operation, then by the first rigid course hot pressing while hot in the height
In molecule insulation on the one side of solid sandwich layer；
After second rigid course is carried out heating operation, then by the second rigid course hot pressing while hot in the height
In molecule insulation on the another side of solid sandwich layer；
First bonding agents are subjected to melting operation in advance, the first bonding agents are coated in cast polypropylene film while hot
On the inner surface of layer, then by the first bonding agents cast polypropylene film layer and first rigid course are glued
It is connected together, after first bonding agents solidification, obtains the first adhesive layer；
Second bonding agents are subjected to melting operation in advance, the second bonding agents are coated in polyester resin layer while hot
On surface, then by the second bonding agents polyester resin layer and second rigid course are bonded together, to
After the second bonding agents solidification, the second adhesive layer is obtained；
Under the conditions of 150 DEG C~180 DEG C of temperature, curing operation is dried, obtains lithium ion battery flexible packaging film；
Wherein, the tensile strength of solid sandwich layer is 480Mpa~2000Mpa, the polymer insulation in the polymer insulation
In the molecular weight of solid sandwich layer be 10,000~20,000, the density of solid sandwich layer is 0.9~1.1g/cm3 in the polymer insulation；
Wherein, the tensile strength of first rigid course and second rigid course be 45Mpa~
The molecular weight of 2000Mpa, first rigid course and second rigid course is 10,000~200,000, and described first just
Property protective layer and second rigid course density be 0.9~1.5g/cm3.
In one of the embodiments, in the polymer insulation solid sandwich layer with a thickness of 20um~30um.
Described in one of the embodiments, is in advance 160 DEG C~220 by the temperature that first bonding agents carry out melting operation
℃。
Above-mentioned lithium ion battery flexible packaging film, including cast polypropylene film layer, the first adhesive layer, the first rigid protective
Solid sandwich layer, the second rigid course, second adhesive phase and polyester resin layer in layer, polymer insulation, wherein the first rigidity is protected
Sheath and the second rigid course distinguish hot pressing in polymer insulation on the two sides of solid sandwich layer, and cast polypropylene film layer is logical
It crosses the first adhesive layer to bond together with the first rigid course, polyester resin layer passes through the second adhesive layer and the second rigid protective
Layer bonds together, in this way, the overall structure of lithium ion battery flexible packaging film is made to have both good ductility and hardness, forms
Property it is more preferable, and eliminate the use of conductive material aluminium foil, avoid packaging film and negative electrode tab occurs to be shorted and formed ion
The possibility of electrochemical corrosion occurs so as to avoid soft bag lithium ionic cell, greatly improves for the possibility in channel and electron channel
The safety and reliability of soft bag lithium ionic cell.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram of the lithium ion battery flexible packaging film of one embodiment of the invention；
Fig. 2 is the step flow chart of the preparation method of the lithium ion battery flexible packaging film of one embodiment of the invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more
Any and all combinations of relevant listed item.
In order to be preferably illustrated to above-mentioned lithium ion battery flexible packaging film, to more fully understand above-mentioned lithium ion battery
The design of flexible packaging film.
Referring to Fig. 1, a kind of lithium ion battery flexible packaging film 10, comprising:
Cast polypropylene film layer 600, the first adhesive layer 400, the first rigid course 200, solid core in polymer insulation
The 100, second rigid course 300 of layer, second adhesive phase 500 and polyester resin layer 700；First adhesive layer 400 is bonded
In on the cast polypropylene film layer 600, it is separate that first rigid course 300 is adhered to first adhesive layer 400
On the one side of the cast polypropylene film layer 600, solid sandwich layer 100 is adhered to first rigidity in the polymer insulation
On one side of the protective layer 200 far from first adhesive layer 400, second rigid course 300 is adhered to the high score
In insulating sublayer on solid one side of the sandwich layer 100 far from first rigid course 200, the second adhesive phase 500 is bonded
In on one side of second rigid course 300 far from sandwich layer 100 solid in the polymer insulation, the polyester resin layer
700 are adhered on one side of the second adhesive phase 500 far from second rigid course 300.
It is appreciated that soft bag lithium ionic cell has lightweight, miniaturization, slimming, large capacity, memory-less effect and peace
The features such as performance is good entirely, is widely used to the power supply of mobile phone, computer, video camera, camera etc., and in electronic vapour
The fields such as driving skills art, the energy-storage battery of big power station, ups power, Medical Instruments power supply play a significant role.As electronics disappears
Fei Pin's becomes increasingly prosperous, and market is swift and violent to the demand growth of soft bag lithium ionic cell.Due to using for soft bag lithium ionic cell
Journey is dynamic electrochemical reaction process, it is desirable that packaging material can resist electrolyte inside swelling, dissolution, infiltration, absorption and electricity
Chemical reaction, and significant changes do not occur for heat seal strength.And cast polypropylene film (CPP) is that quenching life is cast by melt
The cast film of a kind of tensionless winkler foundation, non-directional that produce, transparency and glossiness are fabulous, and thickness is uniform, and vertical and horizontal performance is flat
Weighing apparatus property is excellent, for the innermost layer material of soft bag lithium ionic cell packaging film, can be good at solving soft bag lithium ionic cell hair
Angry swollen problem keeps the overall performance of soft bag lithium ionic cell stable and structure flatness, in this way, passing through the first adhesive layer
400 soft bag lithium ionic cell packaging film innermost layer bonding cast polypropylene film layer 600 can be improved Soft Roll lithium-ion electric
The cyclical stability and overall structure flatness in pond.
It is packed it should be noted that existing soft bag lithium ionic cell generallys use aluminum plastic film, compared to traditional liquid
The metal shell security performance of state battery core is more preferable, is less easy to happen explosion, this is because aluminum plastic film has certain extension
Property, lithium ion battery occurs to be capable of providing relatively large cushion space when flatulence, so will not so be easy quick-fried.Plastic-aluminum
The outermost layer of film is usually nylon layer, and middle layer is aluminium foil layer and innermost layer is layer of polypropylene foil, is had again among every two layers
Adhesive phase.However the electric conductor that aluminium foil is excellent as one kind, in soft bag lithium ionic cell encapsulation process, it is easy to cathode
Tab is shorted, so that electron channel is provided for inside lithium ion cell, in addition in encapsulation process, since polypropylene is in height
Certain mobility is had under temperature state, so that the thickness distribution of layer of polypropylene foil is uneven, some positions are than relatively thin, some portions
Bit comparison is thick, and than once breakage due to stretching or be bent of relatively thin position, then make the electrolyte of inside lithium ion cell
Etc. having an opportunity to be contacted across layer of polypropylene foil with aluminium foil layer, so that ion channel is formed, in this way, making lithium ion battery
Electrochemical corrosion easily occurs, so that in storage and use process inflatable, and most back leak occur quickly for lithium ion battery
Liquid, less serious case make lithium ion battery fail, it may also happen that the dangerous situations such as fire under serious conditions.In this way, the present invention uses
Solid middle layer of the sandwich layer 100 as soft bag lithium ionic cell packaging film, plays good supporting role, simultaneously in polymer insulation
Due to good insulation performance, avoiding the problem of being shorted as aluminium foil with tab, and barrier property and puncture-resistant
Property it is good, while there is good electrolyte resistance stability again, enable to soft bag lithium ionic cell prevent electrochemistry occurs it is rotten
The case where erosion.
It is to be particularly noted that the good ductility that solid sandwich layer 100 has in addition to itself in polymer insulation, it can
Relatively large cushion space is provided when inflatable occurs for soft bag lithium ionic cell, is avoided packaging film spalling and feelings of causing danger
Condition considers that soft bag lithium ionic cell packaging film should also have good mouldability, shape needed for production is capable of forming after heat-sealing
Shape, for example, consolidating the tensile strength of sandwich layer 100 in the polymer insulation for 480Mpa~2000Mpa, in the polymer insulation
Gu the molecular weight of sandwich layer 100 is 10,000~20,000, the density of solid sandwich layer 100 is 0.9g/cm in the polymer insulation3~1.1g/
cm3；In this way, there was only the aluminium foil of 80Mpa~100Mpa compared to tensile strength, the drawing of solid sandwich layer 100 in the polymer insulation
It stretches intensity to have overwhelming superiority, have when can be stretched or be bent in soft bag lithium ionic cell heat seal process preferably soft
The thickness of toughness, formation is more uniform, avoids that fracture locally occurs because stretching excessively severity or thickness is smaller, in subsequent use
Occur in the process damaged and is easy to that electrochemical corrosion occurs.In addition, the molecular weight compared to aluminium foil only has 27, the macromolecule
The molecular weight of solid sandwich layer 100 is 10,000~20,000 in insulation, and solid sandwich layer 100 in the polymer insulation is enabled to have preferably
Mouldability, conducive to the required shape of production is prepared.However, due to being 2.7cm compared to density3Aluminium foil, the high score
The density of solid sandwich layer 100 is 0.9g/cm in insulating sublayer3~1.1g/cm3, compared to the Soft Roll lithium for the middle layer being used as using aluminium foil
Ion battery packaging film, using soft bag lithium ionic cell packaging film of the sandwich layer 100 as middle layer solid in the polymer insulation
Mouldability can be more slightly worse, in this way, the present invention passes through the hot pressing respectively on the two sides of solid sandwich layer 100 in the polymer insulation
First rigid course 200 and the second rigid course 300, further enhance lithium ion battery flexible packaging film 10 rigidity or
Person says mouldability, wherein the tensile strength of first rigid course 200 and second rigid course 300 is 45Mpa
The molecular weight of~2000Mpa, first rigid course 200 and second rigid course 300 is 10,000~200,000, institute
The density for stating the first rigid course 200 and second rigid course 300 is 0.9g/cm3~1.5g/cm3, compared to aluminium
Foil, first rigid course 200 and second rigid course 300 have better tensile strength, likewise, rigid
Property in other words in mouldability not as good as aluminium foil, however, by by first rigid course 200 and second rigid course
300 with it is solid in the polymer insulation sandwich layer 100 is hot-forming is used in conjunction with, enable to lithium ion battery flexible packaging film 10
Overall structure has both good ductility and hardness, and mouldability is more preferable, and eliminates the use of conductive material aluminium foil, avoids
The possibility for being shorted and being formed ion channel and electron channel occurs for packaging film and negative electrode tab, soft so as to avoid lithium ion battery
The possibility of electrochemical corrosion occurs for packaging film 10, greatly improves the safety of lithium ion battery flexible packaging film 10 and reliable
Property.
It is appreciated that polyester resin, that is, polyethylene terephthalate (PET) is the contracting of terephthalic acid (TPA) and ethylene glycol
Polymers, molecular structure high degree of symmetry have certain crystalline orientation ability, so film forming with higher, in addition, terylene tree
Rouge also has good weatherability, dimensional stability and electrical insulating property, in this way, described by the way that polyester resin layer 700 to be adhered to
On one side of the second adhesive phase 500 far from second rigid course 300, as the lithium ion battery flexible packaging film
10 outermost layer enables to the lithium ion battery flexible packaging film 10 to have good tensile strength, wearability, electrical insulating property
And weatherability.
The material of solid sandwich layer 100 is PP or ABS in the polymer insulation in one of the embodiments,.
In order to avoid electrochemical corrosion occurs for soft bag lithium ionic cell, for example, the material of sandwich layer admittedly in the polymer insulation
Matter is PP or ABS, it will be understood that PP (polypropylene) is a kind of hemicrystalline thermoplastic, impact resistance with higher, machine
Tool property is tough, resists a variety of organic solvents and acid and alkali corrosion, in addition, the molecular weight of PP is 10,000~20,000, tensile strength is
483Mpa~1034Mpa, and density is 0.9g/cm3~0.91g/cm3, in this way, using PP as solid in the polymer insulation
The material of sandwich layer 100 can guarantee that the lithium ion battery flexible packaging film 10 has compared to the better tensile strength of aluminium foil, extend
Property it is more preferable, simultaneously because molecular weight be 10,000~20,000, additionally it is possible to guarantee the lithium ion battery flexible packaging film 10 to a certain extent
Mouldability；For another example, the material of solid sandwich layer is ABS in the polymer insulation, it will be understood that ABS (acrylonitrile-butadiene-benzene
Ethylene copolymer) it is the terpolymer of butadiene and styrene composition by acrylonitrile, there is good impact resistance, heat-resisting
Property, lower temperature resistance, chemical resistance and electric property, there is certain rigidity and hardness, also there is easy processing, product size
Stablize, the features such as lustrous surface is good, be easy to carry out the secondary operation such as coating, hot pressing and bonding, in addition, the molecular weight of ABS is 1
Ten thousand~20,000, tensile strength 2000Mpa, and density is about 1.05g/cm3, in this way, using ABS as the polymer insulation
In the material of solid sandwich layer 100 can guarantee that the lithium ion battery flexible packaging film 10 has compared to the better tensile strength of aluminium foil,
Ductility is more preferable, simultaneously because molecular weight is 10,000~20,000, additionally it is possible to guarantee the lithium ion battery flexible package to a certain extent
The mouldability of film 10.
The material of first rigid course 200 is in PP, PET, PMMA and ABS in one of the embodiments,
It is at least one.
In order to further increase the mouldability of the lithium ion battery flexible packaging film 10, the solid sandwich layer also in polymer insulation
The material 200 of first rigid course is bonded on 100 one side, for example, the material 200 of first rigid course
For at least one of PP, PET, PMMA and ABS, it will be understood that PET, that is, polyester resin has good film forming, weather-proof
Property, dimensional stability and electrical insulating property, in this way, the material of first rigid course 200 is that PET can be in conjunction with the high score
Solid sandwich layer 100 in insulating sublayer, further such that the mouldability of the lithium ion battery flexible packaging film 10 is more preferable, for another example, described the
The material of one rigid course 200 is PMMA (polymethyl methacrylate), it will be understood that polymethyl methacrylate has been commonly called as
Machine glass is the high-molecular compound as made of methyl methacrylate polymerization, has good chemical stability, mechanical property
With weatherability and insulation performance, and the molecular weight of PMMA be 80,000~200,000, density 1.18g/cm3, so, it is possible so that institute
Stating the first rigid course 200 has preferably rigidity, further increases the mouldability of the lithium ion battery flexible packaging film 10,
For another example, the material of first rigid course 200 is at least one of PP or ABS, so, it is possible to combine polymer insulation
In solid sandwich layer 100 while guaranteeing that the lithium ion battery flexible packaging film 10 has ductility better compared to aluminum plastic film,
Also there is preferable mouldability, can satisfy needs of production.
In one of the embodiments, first rigid course 200 with a thickness of 10um~15um.In order to improve
State the mouldability of lithium ion battery flexible packaging film 10, for example, first rigid course 200 with a thickness of 10um~15um,
It so, it is possible so that first rigid course 200 has preferably rigidity, so that the lithium ion battery flexible package
The mouldability of film 10 is more preferable；For another example, first rigid course 200 with a thickness of 12um, so, it is possible so that the lithium from
The mouldability of sub- battery flexible packaging film 10 is more preferable.
The material of second rigid course 300 is in PP, PET, PMMA and ABS in one of the embodiments,
It is at least one.
In order to further increase the mouldability of the lithium ion battery flexible packaging film 10, the solid sandwich layer also in polymer insulation
Second rigid course 300 is bonded on 100 another side, for example, the material of second rigid course 300 is
At least one of PP, PET, PMMA and ABS, it will be understood that PP, PET, PMMA and ABS all have good stability, weather-proof
Property and insulation performance, combine with sandwich layer 100 solid in the polymer insulation as in the lithium ion battery flexible packaging film 10
Between support construction, enable to the lithium ion battery flexible packaging film 10 not only have good ductility, also have it is good
Mouldability is capable of forming actually required shape when conducive to subsequent encapsulation soft bag lithium ionic cell.It is described in order to further increase
The mouldability of lithium ion battery flexible packaging film 10, for another example, second rigid course 300 with a thickness of 10um~15um, then
Such as, second rigid course 300 with a thickness of 12um, so, it is possible so that the lithium ion battery flexible packaging film 10
Mouldability is more preferable.
In one of the embodiments, the cast polypropylene film layer 600 with a thickness of 15um~25um.It can manage
Solution, innermost layer material of the cast polypropylene film layer 600 as the lithium ion battery flexible packaging film 10 can be fine
Solve the problems, such as that inflatable occurs for soft bag lithium ionic cell, keep that the overall performance of soft bag lithium ionic cell is stable and structure is smooth
Degree, in order to improve the overall performance stability and structure flatness of the lithium ion battery flexible packaging film 10, for example, the curtain coating
Layer of polypropylene foil 600 with a thickness of 15um~25um, so, it is possible more preferably to resist soft bag lithium ionic cell electrolyte inside molten
Swollen, dissolution, infiltration, absorption and electrochemical reaction, and significant changes do not occur for heat seal strength, so that the lithium-ion electric
The overall performance stability and structure flatness of pond flexible packaging film 10 are more preferable.
In one of the embodiments, the polyester resin layer 700 with a thickness of 20um~40um.It is appreciated that described
Outermost layer of the polyester resin layer 700 as the lithium ion battery flexible packaging film 10, enables to the lithium ion battery Soft Roll
Filling film 10 has good tensile strength, wearability, electrical insulating property and weatherability, in order to improve the lithium ion battery flexible package
Ductility, wearability and the weatherability of film 10, for example, the polyester resin layer 700 with a thickness of 20um~40um, in this way, energy
Enough further increase ductility, wearability and the weatherability of the lithium ion battery flexible packaging film 10.
Referring to Fig. 2, a kind of preparation method of lithium ion battery flexible packaging film, includes the following steps:
S110, solid sandwich layer in polymer insulation is provided.
It is played by solid sandwich layer in offer polymer insulation as the middle layer of the lithium ion battery flexible packaging film 10
Good supporting role avoids asking of being shorted as aluminium foil with tab simultaneously because having good insulation performance
Topic, and barrier property and paracentesis resistance are good, while having good electrolyte resistance stability again, enable to Soft Roll lithium-ion electric
Pond prevents that there is a situation where electrochemical corrosion.
In one of the embodiments, in the polymer insulation solid sandwich layer with a thickness of 20um~30um.It is appreciated that
The thickness of solid sandwich layer is smaller compared to the thickness of conventional aluminum plastic film in the polymer insulation, reduces soft bag lithium ionic cell encapsulation
Difficulty, while also reducing the weight of soft bag lithium ionic cell, there is the lithium ion battery flexible packaging film 10 more
Good ductility and electrical insulating property, ensure that good packaging effect, while avoiding the generation of electrochemical corrosion, so that Soft Roll
The safety in utilization and better reliability of lithium ion battery.
Wherein, the tensile strength of solid sandwich layer is 480Mpa~2000Mpa, the polymer insulation in the polymer insulation
In the molecular weight of solid sandwich layer be 10,000~20,000, the density of solid sandwich layer is 0.9~1.1g/cm in the polymer insulation3。
It is appreciated that in the polymer insulation solid sandwich layer in addition to the good ductility that has, can Soft Roll lithium from
Sub- battery occurs to provide relatively large cushion space when inflatable, avoids packaging film spalling and situation of causing danger, considers Soft Roll
Lithium ion battery packaging film should also have good mouldability, shape needed for production is capable of forming after heat-sealing, for example, described
The tensile strength of solid sandwich layer is 480Mpa~2000Mpa in polymer insulation, the molecule of solid sandwich layer 100 in the polymer insulation
Amount is 10,000~20,000, and the density of solid sandwich layer 100 is 0.9g/cm in the polymer insulation3~1.1g/cm3；In this way, compared to drawing
The aluminium foil that intensity only has 80Mpa~100Mpa is stretched, the tensile strength of solid sandwich layer 100 is occupied absolutely excellent in the polymer insulation
Gesture has better flexibility, the thickness of formation when can be stretched or be bent in soft bag lithium ionic cell heat seal process
It is more uniform, it avoids that fracture occurs due to part is excessively severe because stretching or thickness is smaller, breakage occurs in subsequent use process
And it is easy to that electrochemical corrosion occurs.In addition, the molecular weight compared to aluminium foil only has 27, solid sandwich layer in the polymer insulation
100 molecular weight is 10,000~20,000, enables to solid sandwich layer 100 in the polymer insulation to have better mouldability, is conducive to
Shape needed for production is prepared.
S120, after the first rigid course is carried out heating operation, then the first rigid course hot pressing while hot existed
In the polymer insulation on the one side of solid sandwich layer.
Due to being 2.7cm compared to density3Aluminium foil, the density of solid sandwich layer 100 is 0.9g/cm in the polymer insulation3
~1.1g/cm3, exhausted using the macromolecule compared to the soft bag lithium ionic cell packaging film for the middle layer being used as using aluminium foil
Solid sandwich layer can be more slightly worse as the mouldability of the soft bag lithium ionic cell packaging film of middle layer in edge, in this way, the present invention pass through by
After first rigid course carries out heating operation, then by the first rigid course hot pressing while hot in the polymer insulation
Gu on the one side of sandwich layer, the rigidity of lithium ion battery flexible packaging film mouldability in other words can be further strengthened, for example, described
The tensile strength of first rigid course 200 is 45Mpa~2000Mpa, and molecular weight is 10,000~200,000, density 0.9g/cm3
~1.5g/cm3, in this way, being used in conjunction with sandwich layer solid in the polymer insulation, enable to lithium ion battery flexible packaging film
Overall structure has both good ductility and hardness, and mouldability is more preferable, and eliminates the use of conductive material aluminium foil, avoids
The possibility for being shorted and being formed ion channel and electron channel occurs for packaging film and negative electrode tab, soft so as to avoid lithium ion battery
The possibility of electrochemical corrosion occurs for packaging film, greatly improves the safety and reliability of lithium ion battery flexible packaging film.
S130, after the second rigid course is carried out heating operation, then the second rigid course hot pressing while hot existed
In the polymer insulation on the another side of solid sandwich layer.
After the second rigid course is carried out heating operation, then by the second rigid course hot pressing while hot in institute
On the another side for stating in polymer insulation solid sandwich layer, so, it is possible to make up in the polymer insulation rigidity of solid sandwich layer and
The problem of hardness is not as good as aluminium foil, the second rigid course with it is solid in the polymer insulation sandwich layer is hot-forming is used in conjunction with,
The overall structure of lithium ion battery flexible packaging film is enabled to have both good ductility and hardness, mouldability is more preferable, and removes from
The use of conductive material aluminium foil, avoids packaging film and negative electrode tab occurs to be shorted and formed ion channel and electron channel
Possibility, so as to avoid lithium ion battery flexible packaging film occur electrochemical corrosion possibility, greatly improve lithium-ion electric
The safety and reliability of pond flexible packaging film.
Wherein, the tensile strength of first rigid course and second rigid course be 45Mpa~
The molecular weight of 2000Mpa, first rigid course and second rigid course is 10,000~200,000, and described first just
Property protective layer and second rigid course density be 0.9~1.5g/cm3.It is appreciated that compared to aluminium foil, described the
One rigid course and second rigid course have better tensile strength, however, in rigidity in other words mouldability
Not as good as aluminium foil, by the way that sandwich layer will be consolidated in first rigid course and second rigid course and the polymer insulation
It is hot-forming to be used in conjunction with, enable to the overall structure of lithium ion battery flexible packaging film to have both good ductility and hardness,
Mouldability is more preferable, and eliminates the use of conductive material aluminium foil, avoids packaging film and negative electrode tab occurs to be shorted and be formed
The possibility of electrochemical corrosion, pole occur so as to avoid lithium ion battery flexible packaging film for the possibility of ion channel and electron channel
The big safety and reliability for improving lithium ion battery flexible packaging film.
S140, first bonding agents are subjected to melting operation in advance, the first bonding agents is coated in curtain coating poly- third while hot
On the inner surface of alkene film layer, then by the first bonding agents by the cast polypropylene film layer and it is described first rigidity protect
Sheath bonds together, and after first bonding agents solidification, obtains the first adhesive layer.
It is appreciated that cast polypropylene film be a kind of tensionless winkler foundation that quenching production is cast by melt, non-directional it is flat
Film is squeezed, transparency and glossiness are fabulous, and thickness is uniform, and vertical and horizontal performance balance is excellent, are used for Soft Roll lithium-ion electric
The innermost layer material of pond packaging film can be good at solving the problems, such as that inflatable occurs for soft bag lithium ionic cell, keep Soft Roll lithium from
The overall performance stabilization and structure flatness of sub- battery, in this way, while hot will by the way that first bonding agents are carried out melting operation in advance
The first bonding agents are coated on the inner surface of cast polypropylene film layer, then by the first bonding agents by the curtain coating
Layer of polypropylene foil bonds together with first rigid course, and after first bonding agents solidification, it is viscous to obtain first
Layer is closed, as outermost layer, to greatly improve in this way, cast polypropylene film is adhered on the lithium ion battery flexible packaging film
The lithium ion battery flexible packaging film overall performance is stable and structure flatness.
Described in one of the embodiments, is in advance 160 DEG C~220 by the temperature that first bonding agents carry out melting operation
℃.It is appreciated that by that first bonding agents will be carried out melting operation in advance, then it is coated in cast polypropylene film layer while hot
On inner surface, it for example, melting first bonding agents using 160 DEG C~220 DEG C of temperature, so, it is possible that poly- third will be cast
Alkene film layer is adhered on the first rigid course, so that the cast polypropylene film layer is as the lithium ion battery Soft Roll
The outermost layer for filling film, improves the cyclical stability and overall structure flatness of soft bag lithium ionic cell.
S150, second bonding agents are subjected to melting operation in advance, the second bonding agents is coated in polyester resin while hot
On the inner surface of layer, then by the second bonding agents polyester resin layer and second rigid course are bonded in one
It rises, after second bonding agents solidification, obtains the second adhesive layer.
It is appreciated that outermost layer of the polyester resin layer as the lithium ion battery flexible packaging film, enables to institute
Lithium ion battery flexible packaging film is stated with good tensile strength, wearability, electrical insulating property and weatherability, in this way, by preparatory
Second bonding agents are subjected to melting operation, are while hot coated in the second bonding agents on the inner surface of polyester resin layer, then lead to
It crosses the second bonding agents polyester resin layer and second rigid course bond together, to second bonding
After agent solidification, the second adhesive layer is obtained, so, it is possible so that the polyester resin layer is adhered to second rigid course
On, as the outermost layer of the lithium ion battery flexible packaging film, enable to the lithium ion battery flexible packaging film to have good
Tensile strength, wearability, electrical insulating property and weatherability.For another example, using 160 DEG C~220 DEG C temperature by second bonding agents into
Row melting, so, it is possible the bonding compactness for further increasing the polyester resin layer with second rigid course, so that
Outermost layer of the polyester resin layer as the lithium ion battery flexible packaging film, enables to the lithium ion battery flexible package
Film has good tensile strength, wearability, electrical insulating property and weatherability.
S160, under the conditions of 150 DEG C~180 DEG C of temperature, be dried curing operation, obtain lithium ion battery flexible package
Film.
By the way that curing operation under the conditions of 150 DEG C~180 DEG C of temperature, is dried, it is soft lithium ion battery can be obtained
Packaging film.The use of conductive aluminum foil material is avoided, so that the lithium ion battery flexible packaging film is with good
Electrical insulating property is avoided being shorted with tab, or is contacted with electrolyte, and the risk of electrochemical corrosion occurs, so that
Soft bag lithium ionic cell has better safety and reliability.
The preparation method of above-mentioned lithium ion battery flexible packaging film can obtain the lithium for having both good ductility and mouldability
Ion battery flexible packaging film, and eliminate the use of conductive material aluminium foil, avoid packaging film and negative electrode tab occur to be shorted with
And the possibility of ion channel and electron channel is formed, the possibility of electrochemical corrosion occurs so as to avoid soft bag lithium ionic cell,
Greatly improve the safety and reliability of soft bag lithium ionic cell.
Here is specific embodiment part.
Embodiment 1
PP layer with a thickness of 20um is provided；
By pet layer, hot pressing exists while hot after carrying out heating operation with a thickness of the pet layer of 10um, then using the pressure of 0.5Mpa
On PP layers of one side；
After PMMA layer with a thickness of 10um is carried out heating operation, then use the pressure of 0.5Mpa by PMMA layers of hot pressing while hot
On PP layers of another side；
Under the conditions of 160 DEG C of temperature, polyurethane adhesive is subjected to melting operation, while hot coats polyurethane adhesive
On the inner surface with a thickness of the cast polypropylene film layer of 15um, then pass through polyurethane adhesive for cast polypropylene film layer
It bonds together with pet layer, after polyurethane adhesive solidification, obtains the first adhesive layer；
Under the conditions of 170 DEG C of temperature, polyurethane adhesive is subjected to melting operation, while hot coats polyurethane adhesive
It is on the inner surface with a thickness of the polyester resin layer of 20um, then through polyurethane adhesive that polyester resin layer is Nian Jie with PMMA layers
Together, after polyurethane adhesive solidification, the second adhesive layer is obtained；
Under the conditions of 150 DEG C of temperature, curing operation is dried, obtains the lithium ion battery flexible packaging film of embodiment 1.
Embodiment 2
PP layer with a thickness of 25um is provided；
After PMMA layer with a thickness of 15um is carried out heating operation, then use the pressure of 0.5Mpa by PMMA layers of hot pressing while hot
On PP layers of one side；
By abs layer, hot pressing exists while hot after carrying out heating operation with a thickness of the abs layer of 10um, then using the pressure of 1.5Mpa
On PP layers of another side；
Under the conditions of 180 DEG C of temperature, epoxy resin bonding agent is subjected to melting operation, while hot by epoxy resin bonding agent
It is coated on the inner surface with a thickness of the cast polypropylene film layer of 20um, then by polyurethane adhesive that cast polypropylene is thin
Film layer bonds together with PMMA layers, after polyurethane adhesive solidification, obtains the first adhesive layer；
Under the conditions of 180 DEG C of temperature, polyurethane adhesive is subjected to melting operation, while hot coats polyurethane adhesive
It is on the inner surface with a thickness of the polyester resin layer of 20um, then through polyurethane adhesive that polyester resin layer is Nian Jie with abs layer
Together, after polyurethane adhesive solidification, the second adhesive layer is obtained；
Under the conditions of 170 DEG C of temperature, curing operation is dried, obtains the lithium ion battery flexible packaging film of embodiment 2.
Embodiment 3
Abs layer with a thickness of 30um is provided；
By pet layer, hot pressing exists while hot after carrying out heating operation with a thickness of the pet layer of 12um, then using the pressure of 0.5Mpa
On the one side of abs layer；
After PMMA layer with a thickness of 15um is carried out heating operation, then use the pressure of 5Mpa that PMMA layers of hot pressing while hot exist
On the another side of abs layer；
Under the conditions of 220 DEG C of temperature, polyurethane adhesive is subjected to melting operation, while hot coats polyurethane adhesive
On the inner surface with a thickness of the cast polypropylene film layer of 25um, then pass through polyurethane adhesive for cast polypropylene film layer
It bonds together with pet layer, after polyurethane adhesive solidification, obtains the first adhesive layer；
Under the conditions of 220 DEG C of temperature, polyurethane adhesive is subjected to melting operation, while hot coats polyurethane adhesive
It is on the inner surface with a thickness of the polyester resin layer of 20um, then through polyurethane adhesive that polyester resin layer is Nian Jie with PMMA layers
Together, after polyurethane adhesive solidification, the second adhesive layer is obtained；
Under the conditions of 180 DEG C of temperature, curing operation is dried, obtains the lithium ion battery flexible packaging film of embodiment 3.
It is proved by experimental analysis, the lithium ion battery flexible packaging film of embodiment 1- embodiment 3 all has good extension
Property and mouldability, especially there is good insulating properties, well avoid soft bag lithium ionic cell and electrochemical corrosion occurs
The ductility and mouldability of the lithium ion battery flexible packaging film of risk, especially embodiment 3 are best, and overall performance compares plastic-aluminum
Film can better ductility, especially its insulating properties, avoid that packaging film and negative electrode tab occur to be shorted and to form ion logical
The possibility of electrochemical corrosion occurs so as to avoid soft bag lithium ionic cell, greatly improves for the possibility in road and electron channel
The safety and reliability of soft bag lithium ionic cell.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of lithium ion battery flexible packaging film characterized by comprising
Cast polypropylene film layer；
First adhesive layer, first adhesive layer are adhered on the cast polypropylene film layer；
First rigid course, it is thin far from the cast polypropylene that first rigid course is adhered to first adhesive layer
On the one side of film layer；
Consolidate sandwich layer in polymer insulation, solid sandwich layer is adhered to first rigid course far from described in the polymer insulation
On the one side of first adhesive layer；
Second rigid course, second rigid course are adhered in the polymer insulation solid sandwich layer far from described first
On the one side of rigid course；
Second adhesive phase, the second adhesive phase are adhered to second rigid course far from the polymer insulation
Gu on the one side of sandwich layer；
Polyester resin layer, the polyester resin layer are adhered to one of the second adhesive phase far from second rigid course
On side.
2. lithium ion battery flexible packaging film according to claim 1, which is characterized in that solid sandwich layer in the polymer insulation
Tensile strength be 480Mpa~2000Mpa, the molecular weight of solid sandwich layer is 10,000~20,000 in the polymer insulation, the high score
The density of solid sandwich layer is 0.9~1.1g/cm in insulating sublayer3。
3. lithium ion battery flexible packaging film according to claim 2, which is characterized in that first rigid course and institute
The tensile strength for stating the second rigid course is 45Mpa~2000Mpa, and first rigid course and second rigidity are protected
The molecular weight of sheath is 10,000~200,000, the density of first rigid course and second rigid course is 0.9~
1.5g/cm3。
4. lithium ion battery flexible packaging film according to claim 1, which is characterized in that solid sandwich layer in the polymer insulation
Material be PP or ABS.
5. lithium ion battery flexible packaging film according to claim 1, which is characterized in that the material of first rigid course
Matter is at least one of PP, PET, PMMA and ABS.
6. lithium ion battery flexible packaging film according to claim 5, which is characterized in that the thickness of first rigid course
Degree is 10um~15um.
7. lithium ion battery flexible packaging film according to claim 1, which is characterized in that the material of second rigid course
Matter is at least one of PP, PET, PMMA and ABS.
8. a kind of preparation method of lithium ion battery flexible packaging film, which comprises the steps of:
Solid sandwich layer in polymer insulation is provided；
After first rigid course is carried out heating operation, then by the first rigid course hot pressing while hot in the macromolecule
In insulation on the one side of solid sandwich layer；
After second rigid course is carried out heating operation, then by the second rigid course hot pressing while hot in the macromolecule
In insulation on the another side of solid sandwich layer；
First bonding agents are subjected to melting operation in advance, the first bonding agents are coated in cast polypropylene film layer while hot
On inner surface, then by the first bonding agents cast polypropylene film layer and first rigid course are bonded in
Together, after first bonding agents solidification, the first adhesive layer is obtained；
Second bonding agents are subjected to melting operation in advance, the second bonding agents are coated in the inner surface of polyester resin layer while hot
On, then by the second bonding agents polyester resin layer and second rigid course are bonded together, to described
After second bonding agents solidification, the second adhesive layer is obtained；
Under the conditions of 150 DEG C~180 DEG C of temperature, curing operation is dried, obtains lithium ion battery flexible packaging film；
Wherein, the tensile strength for consolidating sandwich layer in the polymer insulation is 480Mpa~2000Mpa, is consolidated in the polymer insulation
The molecular weight of sandwich layer is 10,000~20,000, and the density of solid sandwich layer is 0.9~1.1g/cm in the polymer insulation3；
Wherein, the tensile strength of first rigid course and second rigid course is 45Mpa~2000Mpa, institute
The molecular weight for stating the first rigid course and second rigid course is 10,000~200,000, first rigid course and
The density of second rigid course is 0.9~1.5g/cm3。
9. the preparation method of lithium ion battery flexible packaging film according to claim 8, which is characterized in that the macromolecule is exhausted
Solid sandwich layer with a thickness of 20um~30um in edge.
10. the preparation method of lithium ion battery flexible packaging film according to claim 8, which is characterized in that the preparatory general
The temperature that first bonding agents carry out melting operation is 160 DEG C~220 DEG C.
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