CN103887452A - Battery packaging film and preparation method of battery packaging film - Google Patents
Battery packaging film and preparation method of battery packaging film Download PDFInfo
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- CN103887452A CN103887452A CN201410066588.0A CN201410066588A CN103887452A CN 103887452 A CN103887452 A CN 103887452A CN 201410066588 A CN201410066588 A CN 201410066588A CN 103887452 A CN103887452 A CN 103887452A
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- 239000012785 packaging film Substances 0.000 title claims abstract description 54
- 229920006280 packaging film Polymers 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000010410 layer Substances 0.000 claims abstract description 206
- 229920000098 polyolefin Polymers 0.000 claims abstract description 21
- 239000005030 aluminium foil Substances 0.000 claims description 98
- 229920005989 resin Polymers 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 21
- 239000000565 sealant Substances 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 229920001155 polypropylene Polymers 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- -1 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004743 Polypropylene Substances 0.000 claims description 13
- 239000005025 cast polypropylene Substances 0.000 claims description 13
- 238000004381 surface treatment Methods 0.000 claims description 13
- 229920001577 copolymer Polymers 0.000 claims description 11
- 239000000178 monomer Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000005977 Ethylene Substances 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 239000013527 degreasing agent Substances 0.000 claims description 5
- 238000005237 degreasing agent Methods 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 150000003608 titanium Chemical class 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 229920001225 polyester resin Polymers 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 238000010422 painting Methods 0.000 claims description 2
- 239000004677 Nylon Substances 0.000 abstract description 14
- 229920001778 nylon Polymers 0.000 abstract description 14
- 239000000853 adhesive Substances 0.000 abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 8
- 239000012790 adhesive layer Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 239000011888 foil Substances 0.000 abstract 6
- 239000003792 electrolyte Substances 0.000 description 18
- 239000005022 packaging material Substances 0.000 description 13
- 238000007789 sealing Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 230000000704 physical effect Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000010030 laminating Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 5
- 230000032798 delamination Effects 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000002390 adhesive tape Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000004227 thermal cracking Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 210000000981 epithelium Anatomy 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000009545 invasion Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- GCPRNIZDNTXQIX-NBPLQZBRSA-N 1-chloro-2-(2-chloroethylsulfanyl)ethane;dichloro-[(e)-3-chloroprop-2-enyl]arsane Chemical compound ClCCSCCCl.Cl\C=C\C[As](Cl)Cl GCPRNIZDNTXQIX-NBPLQZBRSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
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- 238000003487 electrochemical reaction Methods 0.000 description 1
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- 239000012634 fragment Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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- 230000002522 swelling effect Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
- 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
-
- 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
- B32B15/085—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 polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- 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)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a battery packaging film and a preparation method of the battery packaging film. The battery packaging film comprises an aluminum foil layer, a fluororesin layer, an adhesive layer and a polyolefin seal layer, wherein the fluororesin layer is arranged on the first surface of the aluminum foil layer, the adhesive layer is arranged on the second surface of the aluminum foil layer, and the first and second surfaces are opposite to each other. The polyolefin seal layer is adhered to the aluminum foil layer through the adhesive layer. According to the battery packaging film provided by the invention, the surface of the aluminum foil layer is directly coated with the fluororesin layer, so that the condition that a nylon layer is adhered to the surface of the aluminum foil layer through an adhesive in the prior art is avoided. Therefore, a battery packaged by the battery packaging film provided by the invention is relatively thin in thickness and relatively good in tolerance.
Description
Technical field
The present invention has about a kind of battery packaging film, and relates to especially a kind of battery packaging film that comprises fluororesin layer and preparation method thereof.
Background technology
The development trend of lithium rechargeable battery is take high volume energy density as main, and is widely used in the fields such as portable electronic product, intelligent mobile phone and electric motor car.In recent years, follow miniaturization, the lightweight of action electric machine, the lithium ion battery that it carries or the housing material of lithium polymer battery need possess frivolous, high barrier, and applicable to the battery of different size and thickness.Accordingly, by thickness, at 10～100 microns, (the μ m) two sides in scope replaces with the aluminium foil of plastic film laminating old metal can packing, to seek the lightweight of battery.
Because packaging material belong to a part for battery, so it has material impact to the properties of battery, pretend and must there is specific physical property requirement for the packaging material of battery.
Lithium battery is very responsive to temperature, stability and the sealing of heat seal mouth when guaranteeing that battery as the content discharging and recharging is because of temperature rise, and the temperature of consideration environment for use etc., the packaging material of lithium battery also need to have thermal endurance, cold resistance, therefore, the packaging material of lithium battery should be guaranteed stability and the sealing of battery, and need to have fabulous heat sealability.
In addition, some organic substance in packaging material may be dissolved in the performance that produces electrochemical reaction in electrolyte and destroy battery, thus packaging material after packing, long-term store and running among, can not there is Seepage in electrolyte.Packaging material can not be dissolved by electrolyte, can not play swelling action with electrolyte again, soak ability therefore packaging material need have good electrolyte resistance.
When the hermetic unit of battery is subject to outside moisture infiltration, electrolyte can be hydrolyzed and produce acid and heat, and it may corrode packaging material, again because of meeting generation heat, therefore sometimes become battery reason on fire.Or because temperature rise, cause that the electric power of battery declines, also can make connected machine produce to stop or the problem such as fault.Therefore, battery packaging material is all required to have the character that can intercept aqueous vapor.Packaging material are by reaching the maintenance to battery performance to the obstruct of water oxygen.In other words, the aqueous vapor barrier of packaging material has material impact to battery.
Consider necessary physical property, processability and the economy etc. of battery, current known battery packaging film is by sequentially by nylon layer, aluminium foil layer, sealant and stick together the adhesion layer of aforementioned each layer and formed.Aluminium foil layer, as intermediate layer, can completely cut off aqueous vapor, and nylon layer and sealant are in order to provide the characteristics such as high temperature heat-sealing and strength support.But nylon layer is easily embrittlement under the environment of high humidity high temperature, cannot protect aluminium foil layer, causes aluminium foil easily to be corroded by the acid gas of external environment or salinity, cause electrolyte to ooze out the risk of damaging with battery.In addition, general stick together the adhesive agent that nylon layer uses and all use polyurethane series adhesive agent and fragrant family curing agent, easily there is the phenomenon of yellow and hot and humid hydrolysis in it, and then causes interface delamination and the problem such as adhesion layer is rotten and cause aluminium foil corrosion.
Therefore, the battery packaging film of a kind of novelty of current needs, to solve foregoing problems.
Summary of the invention
The invention provides a kind of battery packaging film of novelty, battery packaging film of the present invention has good weatherability and aqueous vapor barrier, and has thinner thickness.
The invention provides a kind of battery packaging film, it comprises: aluminium foil layer; Fluororesin layer, it is disposed on the first surface of aforementioned aluminium foil layer; Adhesion layer, it is disposed on the second surface of aforementioned aluminium foil layer, and wherein, this second surface is relative with this first surface; And polyolefin sealant, it is attached on aforementioned aluminium foil layer by aforementioned adhesion layer.
In one embodiment of this invention, the group that the material of aforementioned fluororesin layer forms for being selected from polytetrafluoroethylene, Kynoar, tetrafluoroethene-perfluoroalkyl monomer copolymer and tetrafluoroethene-ethylene monomer copolymer.
In one embodiment of this invention, the thickness of aforementioned fluororesin layer is 10 microns (m) (μ m) to 25 microns for μ.
In one embodiment of this invention, the adhesion between aforementioned fluororesin layer and aforementioned aluminium foil layer is greater than 5B with hundred lattice tests.
In one embodiment of this invention, this first surface of aforementioned aluminium foil layer is carried out surface treatment.
In one embodiment of this invention, this first surface of aforementioned aluminium foil layer has hydroxyl (OH) group.
In one embodiment of this invention, to select free vistanex, polyester based resin, polyethers be that resin, epoxy are the group that resin and combination thereof form to the material of aforementioned adhesion layer.
In one embodiment of this invention, aforementioned polyolefin sealant is cast polypropylene (CPP) film.
The present invention separately provides a kind of manufacture method of battery packaging film, and aforementioned manufacture method comprises following steps: aluminium foil layer is provided; The first surface of aforementioned aluminium foil layer is carried out to surface treatment; Fluorine resin coating layer is on this first surface of aforementioned surface treated aluminium foil layer; Coating adhesion layer is on the second surface of aforementioned aluminium foil layer, and wherein, this second surface is relative with this first surface; And attach polyolefin sealant, aforementioned polyolefin sealant is attached on aforementioned aluminium foil layer by aforementioned adhesion layer.
In an embodiment of manufacture method of the present invention, aforementioned surfaces is processed with sour degreasing agent, titanium salt inorganic agent and combination thereof, and this first surface of aforementioned aluminium foil carries out surface treatment.
In an embodiment of manufacture method of the present invention, the manufacture method of battery packaging film, is also included in before the aforementioned adhesion layer of coating, and painting polypropylene upgrading silane coupling agent is on this second surface of aforementioned aluminium foil layer.
Compared with prior art, battery packaging film of the present invention, have the following advantages: 1) by directly in a surface-coated fluororesin layer of aluminium foil, utilize the superior thermal endurance of fluororesin layer, formability, insulating properties and electrolyte resistance immersion property, effectively improved stability and the sealing of battery packaging film provided by the invention; 2) carry out surface treatment by the surface of the aluminium foil to fluorine resin coating layer, significantly improved fluororesin layer in the adhesive force of aluminium foil surface, effectively avoid peeling off and causing the stability of battery packages and sealing to reduce because of the resin protective layer of aluminium foil surface.To sum up, adopt the battery of battery packaging film packing provided by the invention can there is thinner thickness and better weatherability.
Accompanying drawing explanation
Fig. 1 is the generalized section of the battery packaging film of one embodiment of the present invention.
The generalized section of each process stage of the manufacture method of the battery packaging film that Fig. 2 A to Fig. 2 E is one embodiment of the present invention.
Embodiment
In order to make the narration of disclosure of the present invention more detailed and complete, below for enforcement aspect of the present invention and specific embodiment illustrative description has been proposed; But this not implements or uses unique form of the specific embodiment of the invention.Disclosed each embodiment below can mutually combine or replace under useful situation, also can add in one embodiment other embodiment, and need not further record or illustrate.
In the following description, many specific detail will be described in detail so that reader can fully understand following embodiment.But, can without these specific detail in the situation that, put into practice embodiments of the invention.In other cases, be simplicity of illustration, the structure of knowing is only schematically illustrated in figure with device.
An object of the present invention is for providing a kind of battery packaging film.
Please refer to Fig. 1, illustrate the generalized section of battery packaging film 10 according to an embodiment of the present invention.The battery packaging film 10 of this exposure have weatherability good, can save the advantage such as glue line material and thinner thickness.As shown in Figure 1, battery packaging film 10 comprises aluminium foil layer 11, fluororesin layer 12, adhesion layer 13 and polyolefin sealant 14.Fluororesin layer 12 is disposed on the first surface of aluminium foil layer 11; Adhesion layer 13 is disposed on aluminium foil layer 11 second surfaces, and wherein, second surface is relative with first surface; Polyolefin sealant 14 is attached on aluminium foil layer 11 by adhesion layer 13.
The material of fluororesin layer 12 can be fluorocarbon resin, for example, can be polytetrafluoroethylene, Kynoar, tetrafluoroethene-perfluoroalkyl monomer copolymer or tetrafluoroethene-ethylene monomer copolymer.In a preferred embodiment of the present invention, the material of fluororesin layer 12 is tetrafluoroethene-ethylene monomer copolymer.The thickness of fluororesin layer 12 can be 10 microns, and (m) (μ m) to 25 microns for μ.In one embodiment of this invention, the thickness of fluororesin layer 12 is 15 microns (μ m).
Hundred lattice tests are a kind of for testing the one experiment of adhesion performance.It draws the little grid of 10 × 10 (100) 1mm × 1mm on test sample book surface with hundred lattice cuttves, each line should be deeply and the bottom of coating; The fragment of test zone is cleaned down with hairbrush; Firmly cling the little grid of wish test with 3M600 gummed paper or the gummed paper that is equal to effect, and with the erasing rubber wiping adhesive tape of exerting oneself, to strengthen contact area and the dynamics in adhesive tape and tested region; Catch adhesive tape one end with hand, (90 °) shut down rapidly gummed paper in the vertical direction, and carry out identical test 2 times at same position.The result of hundred lattice tests can be divided into six grades of 5B-0B.5B represents that scribing edge is smooth, line edge and crosspoint place all without coating shedding; 4B representative has the coating shedding of small pieces at the crosspoint place of line, and the gross area that comes off is less than 5%; 3B representative has the coating shedding of small pieces at edge and the crosspoint place of line, and comes off the gross area between 5%～15%; 2B representative has coating shedding in blocks at edge and the crosspoint place of line, and comes off the gross area between 15%～35%; 1B representative has coating shedding in blocks at edge and the crosspoint place of line, and comes off the gross area between 35%～65%; 0B representative has coating shedding in blocks at edge and the crosspoint place of line, and the gross area that comes off is greater than 65%.Fluororesin layer 12 is coated on aluminium foil layer 11, and with 11 adhesion between hundred lattice test test fluororesin layers 12 and aluminium foil layer, the adhesion between fluororesin layer 12 and aluminium foil layer 11 is greater than 5B.
Because fluororesin layer 12 is not attached on aluminium foil layer 11 with adhesive agent, but by directly coating the surface of aluminium foil layer 11, cause aluminium foil layer 11 to corrode therefore can avoid the problems such as interface delamination or solid go bad.In addition, because having reduced the configuration of adhesive layer and nylon layer, the therefore attenuation of the integral thickness of battery packaging film.
In another embodiment of the present invention, before fluorine resin coating layer 12, the first surface of aluminium foil layer 11 can first pass through surface treatment.Surface treatment can make the first surface of aluminium foil layer 11 and fluororesin layer 12 more closely link, and is easier to carry out coating process.In one embodiment of this invention, the first surface of surface treated aluminium foil layer 11 has hydroxyl (OH) group, the chemical epithelium that it uses the surface of sour degreasing agent and titanium salt inorganic agent impregnation aluminium foil layer 11 to form.
Continue referring to Fig. 1, adhesion layer 13 is disposed on the second surface of aluminium foil layer 11, and wherein, second surface is relative with first surface.The material of adhesion layer 13 can be for example but be not limited to vistanex, polyester based resin, polyethers is that resin, epoxy are resin or its combination.The thickness of adhesion layer 13 is generally 3～8 microns, and (μ m).In one embodiment of this invention, the material of adhesion layer 13 is vistanex, and the thickness of adhesion layer 13 is about 5 microns, and (μ m).
Another object of the present invention is for providing a kind of manufacture method of battery packaging film.Please refer to Fig. 2 A to Fig. 2 E, illustrate the generalized section of each process stage of the manufacture method of the battery packaging film of an embodiment of the present invention.
As shown in Figure 2 A, in manufacturing step, first provide aluminium foil layer 21.Aluminium foil layer 21 is in order to the barrier for aqueous vapor, oxygen etc. to be provided, and its material is generally fine aluminium and maybe can adds micro-iron and increase the processability of aluminium foil layer 21.The thickness of aluminium foil layer 21 be generally 10 microns (m)～100 microns of μ (and μ m) between.Consider physical property, in one embodiment of this invention, the material of aluminium foil layer 21 is soft aluminium foil, in soft aluminium foil, contains iron, and wherein, the percentage by weight of iron in soft aluminium foil is 2%.The thickness of aluminium foil layer 21 is about 40 microns, and (μ m).
Then, as shown in Figure 2 B, optionally the first surface 211 of aluminium foil layer 21 is carried out to surface treatment.Surface treatment can make aluminium foil layer 21 and the fluororesin layer 22 of coating after a while more closely link, and is easier to coating process.In one embodiment of this invention, aluminium foil layer 21 is impregnated in after sour degreasing agent and titanium salt inorganic agent, forms chemical epithelium (not illustrating) at the first surface 211 of aluminium foil layer 21.The first surface 211 of surface treated aluminium foil layer 21 is because having hydroxyl (OH) group, therefore be conducive to follow-up coating process.
Then fluorine resin coating layer 22 is on the first surface 211 of aluminium foil layer 21, as shown in Figure 2 C.Fluororesin layer 22 can make battery packaging film have superior thermal endurance, formability, insulating properties and electrolyte resistance immersion property.Because fluororesin layer 22 has higher thermal cracking temperature compared to the nylon layer using in known techniques, therefore utilize fluororesin layer 22 to replace known nylon layer and adhesion layer, can allow the more high temperature resistant and high humidity environment of battery packaging film.In addition,, because fluororesin layer 22 has higher electrolyte resistance immersion property, therefore can avoid careless because of cell package, electrolyte overflows and causes the phenomenon that battery damages to occur.In another embodiment of the present invention, fluororesin layer 22 is directly coated the surface of aluminium foil layer 21, and this surface is without surface treatment.
The material of fluororesin layer 22 can be fluorocarbon resin, for example, can be polytetrafluoroethylene, Kynoar, tetrafluoroethene-perfluoroalkyl monomer copolymer or tetrafluoroethene-ethylene monomer copolymer.In a preferred embodiment of the present invention, the material of fluororesin layer 22 is tetrafluoroethene-ethylene monomer copolymer.The thickness of fluororesin layer 22 can be 10 microns, and (m) (μ m) to 25 microns for μ.In one embodiment of this invention, the thickness of fluororesin layer 12 is 15 microns (μ m).As shown in Figure 2 C.Through hundred lattice tests, the adhesion between fluororesin layer 22 and aluminium foil layer 21 is greater than 5B.
Form after fluororesin layer 22, as shown in Figure 2 D, the second surface (not illustrating) of adhesion layer 23 being coated to aluminium foil layer 21 is upper, and second surface is relative with first surface 211.In another embodiment of the present invention, before coating adhesion layer 23, optionally first polypropylene upgrading silane coupling agent is coated on the second surface of aluminium foil layer 21, then on silane coupling agent, be coated with again adhesion layer 23.The material of adhesion layer 23 can be but be not limited to vistanex, polyester based resin, polyethers is that resin, epoxy are resin or its combination.The thickness of adhesion layer 23 is generally 3 microns, and ((μ m) for m)～8 microns of μ.In one embodiment of this invention, the material of adhesion layer 23 is vistanex, and the thickness of adhesion layer 23 is about 5 microns, and (μ m).
Finally, by adhesion layer 23, polyolefin sealant 24 is attached on aluminium foil layer 21, as shown in Figure 2 E.Polyolefin sealant 24 can be the resin film of individual layer or the resin film of multilayer, for example polypropylene screen, polyethylene film, upgrading polypropylene screen or cast polypropylene (CPP) film.Polyolefin sealant 24 has heat sealability, can be in order to improve for the chemical proofing of the electrolyte of highly corrosive, enough heat seal strengths to be provided and to prevent aqueous vapor invasion, to maintain the chemical physical property of electrolyte.In one embodiment of this invention, consider heat sealability and processability, polyolefin sealant 24 can be for example cast polypropylene (Cast polypropylene, the CPP) film of three-decker.The structure of cast polypropylene film is generally sequentially laminating adhesion layer/intermediate layer/hot sealing layer, can utilize three-layer co-extruded or blow altogether journey and carry out film forming.Laminating adhesion layer can be to strengthen sticking together design, the good atactic copolymerized polypropene of stampability (PP-R) film.Intermediate layer, for strength support, can be HOPP (PP-H) film of good rigidly.Hot sealing layer can be the atactic copolymerized polypropene that heat sealability is good, stampability is good (PP-R) film.But the embodiment of adhesion layer, intermediate layer and hot sealing layer is not limited to this.
In sum, utilize the battery packaging film of the manufacture method made of battery packaging film of the present invention, do not need to utilize adhesion layer to attach nylon layer on aluminium foil layer, therefore the integral thickness of battery packaging film can reduce, and can avoid the problems such as adhesive agent yellow, hydrolysis or interface delamination and cause aluminium foil layer corrosion, and then increase weatherability.Fluororesin layer, because having higher thermal cracking temperature, makes more high-temp resisting high-humidity resisting environment of battery packaging film.
Following embodiment is used for further illustrating the present invention, but the present invention is not limited.
Embodiment 1: the preparation of battery packaging film
(m), surface is without the aluminium foil (AA specification 8079 in JIS, O material) of the soft aluminum-iron alloy of the visible pin hole of naked eyes for μ to adopt thickness to be 40 microns.First by after aluminium foil washing, immerse 2% sour degreasing agent solution 2 minutes, after cleaning, again aluminium foil is immersed to 1.5% titanium salt inorganic agent (being purchased from general Dehua work, Taiwan) 2 minutes, dry afterwards aluminium foil, form surface-treated layer.Then, on surface-treated layer, be coated with tetrafluoroethene-ethylene monomer copolymer GK570 and (be purchased from large aurification, Japan) and curing agent N3300 (be purchased from Bayer, Germany), and dry 2 minutes with 120 ℃ in baking oven, in the surperficial formation tetrafluoroethylene resin layer of aluminium foil surface processing layer, its thickness is about 15 microns, and (μ m).
Then polypropylene upgrading silane coupling agent P-4 (being purchased from large eastern resin chemistry, Taiwan) is coated to another surface of aluminium foil, dry 1.5 minutes afterwards in baking oven with 120 ℃, coating layer thickness is about 1.5 microns, and (μ m).After silane coupling agent is dry, be then coated with polyolefin adhesive agent LIS405-A5 and curing agent LCR-032 (being purchased from Toyo morton, Japan), in baking oven, to dry 1.5 minutes with 120 ℃, adhesive layer thickness is about 5 microns, and (μ is m).
Cast polypropylene (CPP) film, first with corona treatment, then is pasted on aluminium foil layer by adhesive layer.Finally at 60 ℃, leave standstill 7 days, make coating and solid be cross-linked separately maturation.
The alternative commercially available battery packaging film that is nylon layer/aluminium foil layer/polypropylene layer by a structure as a comparative example 1.Shown in the following list 1 of basic physical property test result of embodiment 1 and comparative example 1.Wherein, weatherability test condition is as follows: temperature is that 121 ℃, relative humidity are 100%, under 2 atmospheric pressure (atm), leave standstill the outward appearance of observing battery packaging film after 168 hours.
The physical property test result of table 1 embodiment and comparative example
| ? | Embodiment 1 | Comparative example 1 |
| (μ m) for thickness | 100 | 118 |
| Aqueous vapor penetrance (g/m 2*day) | 17 | 25 |
| Heat seal strength (N/cm) | 60.7 | 61.1 |
| Weatherability test | Complete | Nylon layer is delamination |
Comparative example 1 is after weather-proof test, and its adhesion layer has been hydrolyzed xanthochromia all, and by the nylon layer of adhesive agent gluing, delamination has occurred.And the battery packaging film of embodiment 1 still maintains integral outer appearance.
With hundred lattice tests, the adhesion between between the fluororesin layer in embodiment 1 and aluminium foil layer is greater than 5B, and the complete adherence of fluororesin layer is in aluminium foil layer.
Further carry out presswork test for embodiment 1, the battery packaging film in embodiment 1 is struck out to the finished product that thickness is 4 millimeters (mm), and be positioned in the baking oven of 60 ℃ 30 days, and the flexure plane of finished product and corner are still without be full of cracks and peeling.
Physical property test result from embodiment 1 with comparative example 1, embodiment 1 is to the rejection rate of aqueous vapor higher than comparative example 1, and the weatherability of embodiment 1 is also better than comparative example 1.Heat seal strength is close with commercially available product.Learnt by above-mentioned comparative result, battery packaging film of the present invention has better aqueous vapor rejection rate, better weatherability and thinner integral thickness, can be used as the flexible package skin of battery, can high temperature resistance high humidity and the adverse weather condition such as high pressure, and continue to keep the integrality of battery.
Although the present invention is described by above-mentioned related embodiment, but above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.
Claims (11)
1. a battery packaging film, is characterized in that, comprises:
Aluminium foil layer;
Fluororesin layer, it is disposed on the first surface of this aluminium foil layer;
Adhesion layer, it is disposed on the second surface of this aluminium foil layer, and this second surface is relative with this first surface; And
Polyolefin sealant, it is attached on this aluminium foil layer by this adhesion layer.
2. the battery packaging film as described in claim 1, is characterized in that the group that the material of this fluororesin layer selects free polytetrafluoroethylene, Kynoar, tetrafluoroethene-perfluoroalkyl monomer copolymer and tetrafluoroethene-ethylene monomer copolymer to form.
3. the battery packaging film as described in claim 1, is characterized in that, the thickness of this fluororesin layer is 10 microns, and (m) (μ m) to 25 microns for μ.
4. the battery packaging film as described in claim 1, is characterized in that, the adhesion between this fluororesin layer and this aluminium foil layer is greater than 5B with hundred lattice tests.
5. the battery packaging film as described in claim 1, is characterized in that, this first surface of this aluminium foil layer is carried out surface treatment.
6. the battery packaging film as described in claim 5, is characterized in that, this first surface of this aluminium foil layer has hydroxyl (OH) group.
7. the battery packaging film processed as described in claim 1, is characterized in that, it is that resin, epoxy are the group that resin and combination thereof form that the material of this adhesion layer selects free vistanex, polyester based resin, polyethers.
8. the battery packaging film as described in claim 1, is characterized in that, this polyolefin sealant is cast polypropylene (CPP) film.
9. a manufacture method for battery packaging film, is characterized in that, this manufacture method comprises following steps:
Aluminium foil layer is provided;
The first surface of this aluminium foil layer is carried out to surface treatment;
Fluorine resin coating layer in this aluminium foil layer on this first surface of this surface-treated;
Coating adhesion layer is on the second surface of this aluminium foil layer, and this second surface is relative with this first surface; And
Attach polyolefin sealant, this polyolefin sealant is attached on this aluminium foil layer by this adhesion layer.
10. the manufacture method of the battery packaging film as described in claim 9, is characterized in that, this surface treatment, with sour degreasing agent, titanium salt inorganic agent and combination thereof, is carried out this surface treatment to this first surface of this aluminium foil.
The manufacture method of 11. battery packaging films as described in claim 9, is characterized in that, be also included in before this adhesion layer of coating, painting polypropylene upgrading silane coupling agent is on the second surface of this aluminium foil layer.
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