CN107154472B - Packaging material for soft package battery and heat control device thereof - Google Patents
Packaging material for soft package battery and heat control device thereof Download PDFInfo
- Publication number
- CN107154472B CN107154472B CN201710125570.7A CN201710125570A CN107154472B CN 107154472 B CN107154472 B CN 107154472B CN 201710125570 A CN201710125570 A CN 201710125570A CN 107154472 B CN107154472 B CN 107154472B
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- Prior art keywords
- aluminum
- layer
- battery
- aluminum foil
- plastic film
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- 239000005022 packaging material Substances 0.000 title abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 395
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 385
- 239000011888 foil Substances 0.000 claims abstract description 287
- 238000005260 corrosion Methods 0.000 claims abstract description 217
- 230000007797 corrosion Effects 0.000 claims abstract description 213
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 173
- 239000002131 composite material Substances 0.000 claims abstract description 61
- 239000000498 cooling water Substances 0.000 claims abstract description 21
- 238000004806 packaging method and process Methods 0.000 claims abstract description 18
- 239000002985 plastic film Substances 0.000 claims description 175
- 229920006255 plastic film Polymers 0.000 claims description 174
- 239000000463 material Substances 0.000 claims description 96
- 239000011162 core material Substances 0.000 claims description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 239000000110 cooling liquid Substances 0.000 claims description 55
- 239000011701 zinc Substances 0.000 claims description 45
- 229910052725 zinc Inorganic materials 0.000 claims description 34
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 27
- 239000003792 electrolyte Substances 0.000 claims description 17
- 239000010985 leather Substances 0.000 claims description 14
- 229920005992 thermoplastic resin Polymers 0.000 claims description 14
- 239000005030 aluminium foil Substances 0.000 claims description 12
- 238000013329 compounding Methods 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 6
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 5
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 229910052772 Samarium Inorganic materials 0.000 claims description 2
- 239000004033 plastic Substances 0.000 abstract description 51
- 229920003023 plastic Polymers 0.000 abstract description 51
- 230000007547 defect Effects 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 286
- 238000012360 testing method Methods 0.000 description 48
- 229910052751 metal Inorganic materials 0.000 description 32
- 239000002184 metal Substances 0.000 description 32
- 239000002826 coolant Substances 0.000 description 31
- 239000000243 solution Substances 0.000 description 31
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 26
- 238000001816 cooling Methods 0.000 description 24
- 230000002528 anti-freeze Effects 0.000 description 23
- 238000000034 method Methods 0.000 description 20
- 239000011241 protective layer Substances 0.000 description 19
- 210000004027 cell Anatomy 0.000 description 17
- 239000012530 fluid Substances 0.000 description 16
- 238000007710 freezing Methods 0.000 description 16
- 239000007788 liquid Substances 0.000 description 14
- 239000004677 Nylon Substances 0.000 description 13
- 229920001778 nylon Polymers 0.000 description 13
- 239000002356 single layer Substances 0.000 description 13
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 12
- 238000005192 partition Methods 0.000 description 12
- 239000012793 heat-sealing layer Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 10
- 239000005025 cast polypropylene Substances 0.000 description 10
- 230000007774 longterm Effects 0.000 description 10
- 238000010998 test method Methods 0.000 description 10
- -1 polypropylene Polymers 0.000 description 9
- 239000000956 alloy Substances 0.000 description 8
- 239000011259 mixed solution Substances 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 229920006015 heat resistant resin Polymers 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000002791 soaking Methods 0.000 description 7
- 125000006850 spacer group Chemical group 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000004952 Polyamide Substances 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 6
- 229920002647 polyamide Polymers 0.000 description 6
- 229920000728 polyester Polymers 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000004809 Teflon Substances 0.000 description 4
- 229920006362 Teflon® Polymers 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
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- 238000004080 punching Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229920002799 BoPET Polymers 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005254 chromizing Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000012809 cooling fluid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010292 electrical insulation Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229920006284 nylon film Polymers 0.000 description 3
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 3
- 229910001250 2024 aluminium alloy Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- SAYOXHYAUHSWHN-UHFFFAOYSA-N alumane;manganese Chemical group [AlH3].[AlH3].[Mn] SAYOXHYAUHSWHN-UHFFFAOYSA-N 0.000 description 2
- HUIAGCXKFBECLZ-UHFFFAOYSA-N alumane;zinc Chemical group [AlH3].[AlH3].[Zn] HUIAGCXKFBECLZ-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 229910001008 7075 aluminium alloy Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- FAMMVRYFJNWDRW-UHFFFAOYSA-N [Fe].[Si].[Cu] Chemical compound [Fe].[Si].[Cu] FAMMVRYFJNWDRW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- KRLDNBXEMNGJGG-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[AlH3].[Cu] KRLDNBXEMNGJGG-UHFFFAOYSA-N 0.000 description 1
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 1
- PVYXVFBYERYVFM-UHFFFAOYSA-N alumane;magnesium Chemical compound [Mg].[AlH3].[AlH3] PVYXVFBYERYVFM-UHFFFAOYSA-N 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000007798 antifreeze agent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229920001112 grafted polyolefin Polymers 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000011229 interlayer 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
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- KBMLJKBBKGNETC-UHFFFAOYSA-N magnesium manganese Chemical compound [Mg].[Mn] KBMLJKBBKGNETC-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 239000003832 thermite Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
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
-
- 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
- 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
- B32B15/088—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 polyamides
-
- 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
- B32B15/09—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 polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- 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)
- Laminated Bodies (AREA)
Abstract
The present invention relates to a battery packaging material for packaging a battery, and more particularly to a packaging material for a pouch battery and a pouch battery thermal management system for use in a vehicle. Aiming at the defect of insufficient corrosion resistance of the packaging material for the battery in the prior art, the following solutions of the aluminum-plastic composite film for the battery packaging are provided: the packaging material for the battery comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein the aluminum foil layer is formed of an aluminum alloy resistant to cooling water corrosion.
Description
Technical Field
The present invention relates to a packaging material for a battery and a pouch battery, and more particularly, to a packaging material for a pouch battery and a pouch battery which can be immersed in cooling water, for example, a water cooling system in the fields of a power battery for a vehicle and an energy storage battery.
Background
The heat management of the power battery is one of core technologies of the power battery, more air cooling is adopted in the existing soft package battery cooling mode, even if water cooling is adopted, the water cooling plate is adopted to contact with the battery for heat exchange, and the corresponding contact thermal resistance in the heat exchange mode is high, and the heat exchange efficiency is low. In the prior art, no application of directly soaking the soft package battery in water or antifreeze exists, and no special aluminum-plastic film is suitable for the soft package battery.
In the prior art, an aluminum plastic film for packaging a soft package battery usually adopts an 8-series aluminum alloy aluminum foil which is a soft aluminum foil after annealing, and has good deep punching formability. The main consideration of the current battery packaging material is electrolyte corrosion resistance, and the main technical scheme is that a corrosion-resistant layer is formed on one side of the packaging material facing an electrolyte through physical or chemical modification, and the corrosion-resistant layer has the function of preventing the electrolyte from corroding the inner surface of an aluminum foil to cause interlayer peeling of an aluminum plastic film. The outermost layer of the existing aluminum-plastic film contains plastic films for protection such as polyamide, and the plastic protective films have poor hydrolysis resistance and are easy to hydrolyze and lose efficacy if contacting water for a long time. The existing aluminum-plastic film aluminum foil has high iron content and poor water corrosion resistance, and is easy to cause corrosion perforation when meeting water. In addition, from the aspects of saving cost and improving battery capacity, the thickness of an aluminum foil layer of an aluminum plastic film in the conventional power soft package battery is usually only 40 micrometers, and the conventional aluminum plastic film does not meet the long-term water corrosion resistance requirement no matter the composition and/or the thickness of the conventional aluminum plastic film. Because of insufficient water corrosion resistance, the battery packaged by the aluminum-plastic film has the risk of corrosion perforation when being soaked in water for a long time.
In order to improve the hydrolysis resistance of the aluminum-plastic film, a common means in the prior art is to improve the hydrolysis resistance of the outer protective film, for example, a PET film which is more water-resistant than a nylon film is used as the outermost protective film. After the PET film is adopted, the corrosion resistance to water vapor or water drops in the air is improved, but the PET film is not suitable for being soaked in water for a long time.
Disclosure of Invention
Starting from the requirement of cooling the soft package battery, in order to obtain higher battery cooling performance, the invention adopts a cooling scheme of directly soaking the soft package battery in cooling water. However, after intensive research, it is found that the outermost nylon protective layer in the existing aluminum plastic film for packaging soft-package batteries has poor anti-corrosion performance against antifreeze coolant, and the aluminum foil serving as a water-blocking layer is made of aluminum-iron alloy, so that the mechanical strength and anti-corrosion performance against antifreeze coolant are also poor, and the existing aluminum plastic film cannot meet the long-term requirement of a soaking type water cooling system. In order to overcome the defects, the invention provides a novel battery packaging material scheme and a battery cooling system scheme to meet the heat management requirements of high-capacity battery systems for new energy vehicles or energy storage and the like.
Aiming at the defect that the automobile-used antifreezing coolant (antifreeze for short) for an aluminum plastic film used for packaging a battery (battery) or the defect that the corrosion resistance of the antifreeze water is insufficient, namely the defect that the aluminum plastic film is easy to be corroded and perforated, the invention particularly provides an aluminum plastic composite film (aluminum plastic film for short) for packaging a lithium ion secondary battery, which has higher coolant corrosion resistance.
In a first aspect, the present invention provides a packaging material (preferably an aluminum plastic film) for a battery, preferably a pouch battery, formed by a metal plastic composite film, comprising a metal foil layer (preferably an aluminum foil layer) and a plastic layer compounded on the inner surface of the metal foil layer (preferably the aluminum foil layer).
In a second aspect, the invention provides a pouch battery comprising an electrode material and an electrolyte, and an outer wrapping metal foil layer (preferably an aluminum-plastic film) as described above, wherein a plastic layer on the inner surface of the metal foil layer (preferably the aluminum foil layer) separates the electrolyte from the metal foil layer (preferably the aluminum-plastic film).
In a third aspect, the invention provides a thermal control device for a battery, preferably a pouch battery, comprising the pouch battery. After the pouch battery is packaged by the aluminum-plastic film resistant to soaking corrosion of the cooling liquid, the pouch battery can be soaked in the cooling liquid (such as an anti-freezing cooling liquid), preferably, the packaging material for the battery formed by the metal-plastic composite film is soaked in the cooling liquid, and more preferably, the metal foil layer (preferably, the aluminum foil layer) is soaked in the cooling liquid, so that heat exchange can be directly carried out with the cooling liquid. The heat exchange effect of the battery is better like this, and the temperature everywhere is more even about the battery about and about.
The fourth aspect of the invention provides a method for manufacturing the packaging material for the battery, preferably an aluminum plastic film, which is formed by the metal plastic composite film.
In a preferred embodiment of the present invention, the aluminum foil layer is a single layer, and more preferably, the aluminum foil layer is formed of a corrosion-resistant aluminum alloy. The corrosion resistance means resistance to corrosion by cooling water or antifreeze. Unless otherwise specified, in the present invention, the term "corrosion resistance" refers to corrosion resistance against cooling water or antifreeze, and not to corrosion resistance against electrolyte.
In a preferred embodiment of the present invention, the aluminum foil layer is a composite layer, the aluminum foil layer includes a core material and a skin material located outside the core material, and the skin material of the aluminum foil layer has a corrosion potential lower than that of the core material. More preferably, the core material is positioned between the plastic layer and the skin material on the inner side of the aluminum foil layer. More preferably, in the battery thermal control device, a skin material of an aluminum plastic film for packaging the pouch battery is soaked in the cooling liquid.
The aluminum plastic film is a film composite material formed by a plastic film and an aluminum foil film, and is used as a packaging material for a polymer lithium battery.
Wherein, the single face of aluminium foil layer is compound to have the plastic layer, perhaps the two sides of aluminium foil layer all are compound to have the plastic layer. If the plastic layer is only compounded on one side of the aluminum foil layer, it is preferable to be compounded only on the inner side of the aluminum foil layer. Wherein, the above scheme includes the following conditions: the plastic layer compounded on one side of the aluminum foil layer can be single-layer plastic or multi-layer plastic.
Further, the inner plastic layer is preferably a thermoplastic resin film. Such as polypropylene (PP) film or Polyethylene (PE) film. The thickness of the inner plastic layer is preferably 50-300 microns, more preferably more than 60 and less than 100 microns, and most preferably 70-90 microns. The inner plastic layer may also be referred to as a heat seal layer or a sealant layer. Preferably, the inner plastic layer is a polyolefin resin or an acid-modified polyolefin resin. The inner plastic layer may also contain one or more additives selected from flame retardants, lubricants, antiblocking agents, antioxidants, light stabilizers, and adhesion imparting agents.
Preferably the inner plastic layer has better electrical insulation properties and thus a higher voltage resistance, such as a voltage resistance of preferably more than 1000V, more preferably more than 2000V.
Further, the outer plastic layer is preferably a heat-resistant resin film. Such as Polyamide (PA) or nylon (Ny or ON) films, or Polyester (PET) films, or Polyimide (PI) films.
The composite layer aluminum alloy preferably includes at least a core material and a skin material compounded on the outer side of the core material. The composite layer aluminum alloy can be two-layer aluminum alloy or multi-layer aluminum alloy.
The aluminum plastic film of the invention can be any one of the structures A) to B):
A) the aluminum-plastic film is provided with a laminated body consisting of an inner plastic heat sealing layer, a middle aluminum foil layer and an outer plastic protective layer, wherein the middle aluminum foil layer is formed by a composite layer aluminum foil with a sacrificial anode protection function. For example, the composite aluminum foil is formed of a core material and a skin material having a corrosion potential lower than that of the core material.
B) The aluminum-plastic film is provided with a laminated body consisting of an inner plastic heat-sealing layer and an outer aluminum foil layer, wherein the outer aluminum foil layer is formed by a composite layer aluminum foil with a sacrificial anode protection function. The aluminum-plastic film does not contain an outer plastic protective layer.
The inner plastic heat-sealing layer may be referred to as a thermoplastic resin film layer, and the outer plastic protective layer may be referred to as a heat-resistant resin film layer.
The corrosion potential of the skin material in the composite layer aluminum foil is 5mV-500mV lower than that of the core material. Furthermore, the corrosion potential of the skin material is 50mV-500mV lower than that of the core material. Preferably, the corrosion potential of the skin material is 70mV to 200mV lower than the corrosion potential of the core material. More preferably, the corrosion potential of the skin material is 100mV-170mV lower than the corrosion potential of the core material.
In the present invention, unless otherwise specified, the corrosion potential refers to the corrosion potential in a water-based coolant environment. Through the reasonable potential matching of the skin material and the core material in the composite aluminum foil, the pitting corrosion of the aluminum foil (particularly the core material) is avoided.
In the present invention, the coolant is a water-based coolant unless otherwise specified. The water-based coolant is a coolant containing water as a basic component. The water-based coolant may also contain various antifreeze agents (such as ethanol, ethylene glycol, propylene glycol, etc.) to form an antifreeze liquid having an antifreeze function. Therefore, the coolant of the present invention includes the following types: pure water, a mixed solution of ethylene glycol and water, and the like.
Or the aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; wherein, the outside of the aluminum foil layer is covered with a metal zinc layer.
Furthermore, the core material of the composite aluminum foil layer is made of corrosion-resistant aluminum alloy or pure aluminum. The pure aluminum includes industrial pure aluminum and high-purity aluminum. The purity of the aluminum in the pure aluminum is preferably more than or equal to 99.0 percent, and more preferably 99.0 to 99.99 percent.
The corrosion-resistant aluminum alloy provided by the invention is characterized in that the aluminum alloy and the aluminum plastic film can keep normal functions for a long time without failure under the environment of direct contact with cooling liquid, for example, the aluminum alloy is not corroded and perforated by the cooling liquid. Wherein the "non-failure" includes that the electrical insulation function of the aluminum plastic film is not failed and the barrier function is not failed. Its performance, although somewhat attenuated, still meets the basic requirements. By "long-term" is meant the duration of the normal life cycle of a product (e.g., an automobile or automobile power battery), such as a product having a life of greater than 5 years, preferably greater than 10 years, and more preferably greater than 15 years. The corrosion-resistant aluminum alloy can be selected from the following rustproof aluminum or aluminum alloy with good corrosion resistance: 1-series aluminum alloy, 3-series aluminum alloy, 5-series aluminum alloy, and 6-series aluminum alloy. Since the corrosion-resistant aluminum alloy (such as aluminum manganese alloy AA3003, and AA is omitted below) or pure aluminum has good coolant corrosion resistance, the aluminum alloy can be used as an aluminum foil layer of an aluminum-plastic film and can be applied to an application occasion in direct contact with a coolant.
If the aluminum foil layer is a composite layer, the aluminum foil layer is formed by compounding a core material and a skin material, the core material is positioned at the inner side, the skin material is positioned at the outer side, and the corrosion potential of the skin material is lower than (or negative to) that of the core material. When the aluminum foil is contacted with corrosive media, electrochemical corrosion is formed, the skin material is used as a sacrificial anode, and the core material used as a cathode is protected, so that the aluminum foil layer in the aluminum plastic film can be prevented from being corroded by water-based cooling liquid for a long time, and the service life of a battery is further ensured. Wherein, the leather material can be a single-layer material or a multi-layer material. If the skin material is multi-layered, it is preferable that the corrosion potential of the multi-layered skin material decreases from the inside to the outside. The thickness of the skin material is preferably 8-20%, more preferably 10 +/-2% of the whole aluminum foil layer. The inner side of the invention refers to the side close to the electrolyte in the battery core when the invention is applied to the soft package battery; the outer side refers to the side far away from the electrolyte in the battery core when the battery is applied to a soft package battery.
The core material may also be referred to as an aluminum substrate. The plastic layer can be various plastic layers which are mature and applied in the prior art, for example, the inner layer adopts cast polypropylene film (CPP), the outer layer adopts nylon film (ON) or/and polyester film (PET), and the plastic layer and the aluminum foil layer can be bonded and compounded by adopting an adhesive in the prior art or compounded by a hot method.
Further, the corrosion-resistant aluminum alloy is selected from aluminum-manganese-aluminum alloy, aluminum-magnesium-silicon-aluminum alloy, or aluminum-silicon-aluminum alloy. More preferably, the corrosion-resistant aluminum alloy is an aluminum-manganese-aluminum alloy, or an aluminum-magnesium-aluminum alloy.
Alternatively, further, the corrosion resistant aluminum alloy is selected from a 3-series aluminum alloy, or a 1-series aluminum alloy, or a 5-series aluminum alloy, or a 6-series aluminum alloy, or a 4-series aluminum alloy. Or these aluminum alloys have good corrosion resistance. The corrosion-resistant aluminum alloy is more preferably a 3-series aluminum alloy, or a 1-series aluminum alloy, or a 5-series aluminum alloy, or a 6-series aluminum alloy.
The aluminum alloy of the invention is named according to the corresponding standards of the American aluminum Association.
Further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is selected from aluminum-zinc-aluminum alloy or aluminum-copper-aluminum alloy. The skin material of the aluminum foil layer is more preferably aluminum-zinc-aluminum alloy. The content of zinc element in the aluminum-zinc alloy is preferably 1-10%, and more preferably 4-7%.
Or, further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is selected from 7 series aluminum alloy or 2 series aluminum alloy. The skin material is selected from 7 series or 2 series aluminum alloy with corrosion potential lower than that of the core material, such as 7072 aluminum alloy or Al clad 2024 aluminum alloy. The skin material of the aluminum foil layer is more preferably a 7-series aluminum alloy. For example, the corrosion potential of 3003 aluminum alloy is about-0.72V, the corrosion potential of 7072 aluminum alloy is about-0.88V, and the corrosion potential of 2024 aluminum alloy is about-0.83V. In addition, besides the basic model of 7072, other modified models of 7072 can be selected as the leather material.
Or, further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is selected from modified aluminum alloy with zinc added. The leather material is preferably 1 series aluminum alloy added with zinc or 3 series aluminum alloy added with zinc, such as 3003 aluminum alloy modified type added with 1.0-2.5% of zinc by mass percentage. The 3003 potential with added zinc was reduced to about-0.82 to-0.88V, and thus lower than the 3003 core potential. Or, the leather material is preferably an aluminum alloy formed by adding zinc on the basis of 1-series aluminum alloy (pure aluminum), such as a1050 aluminum alloy modified type added with 4-7% by mass of zinc.
Further, the corrosion-resistant aluminum alloy is preferably 3003 aluminum alloy, or 3004 aluminum alloy, or 3005 aluminum alloy, or 3105 aluminum alloy, or 3a21 aluminum alloy.
Further, the pure aluminum is 1050 aluminum alloy, or 1060 aluminum alloy, or 1070 aluminum alloy, or 1100 aluminum alloy.
Further, if the aluminum foil layer is a composite layer, the skin material of the aluminum foil layer is 7072 aluminum alloy or 7075 aluminum alloy.
The aluminum foil of the present invention is generally referred to as a film (or a sheet) of pure aluminum or aluminum alloy, and thus the aluminum foil of the present invention may be an aluminum film, and the thickness of the aluminum film may be within 200 microns, or 200-300 microns or 300-500 microns. Or, further, the thickness of the aluminum foil layer in the aluminum plastic film is preferably 80 to 500 micrometers. More preferably 100-300 microns. Even more preferably 200 and 300 microns.
Or, further, the thickness of the aluminum foil layer in the aluminum plastic film is 80-100 micrometers, or 100-.
Further, the outside of the aluminum foil layer is covered with a metal zinc layer. The zinc layer is preferably formed by a zinc-spraying process.
Or, further, the aluminum foil layer is a composite layer, the aluminum foil layer comprises a core material and a skin material, the core material is aluminum alloy, and the skin material is a metal zinc layer.
Further, the outer part of the aluminum foil layer is bonded with a plastic protective layer through a release agent. So that the plastic protective layer outside the aluminum foil layer is easily separated.
Further, the heat sealing layer material can be a polypropylene (PP) film and also can be a Polyethylene (PE) film.
Further, the plastic protective layer may be made of nylon (ON) film or Polyester (PET) film.
The technical scheme comprises the following technical scheme: if the aluminum foil layer of the aluminum-plastic film is a single layer (non-composite layer), the aluminum foil layer may be a 3-series aluminum alloy, or a 1-series aluminum alloy, or a 5-series aluminum alloy, or a 6-series aluminum alloy. If the aluminum foil layer of the aluminum-plastic film is a composite layer, the core material of the aluminum foil layer can be 3 series aluminum alloy, or 1 series aluminum alloy, or 5 series aluminum alloy, or 6 series aluminum alloy, or 8 series aluminum alloy; the skin material of the aluminum foil layer can be 7 series aluminum alloy or 2 series aluminum alloy.
The aluminum foil layer of the aluminum-plastic film provided by the invention has good corrosion resistance, and the aluminum foil layer and the aluminum-plastic film containing the aluminum foil layer have long-term coolant corrosion resistance.
For example, the aluminum foil layer of the aluminum plastic film provided by the invention adopts 3 series aluminum alloy (such as 3003), and more preferably adopts an aluminum alloy composite layer (such as 3003/7072) compounded by 3 series aluminum alloy and 7 series aluminum alloy, so that the aluminum plastic film has excellent coolant corrosion resistance, can be applied to a soft package power battery system for a vehicle, and can be used for directly contacting and exchanging heat between the aluminum plastic film of a soft package battery and coolant.
The aluminum-plastic film can also be used for battery packaging, and the aluminum foil layer has the function of a water-blocking layer.
Alternatively, the aluminum foil layer may have an anticorrosion treated layer formed by chromate treatment or rare earth oxide treatment on the inner side thereof, but this is not essential. In the invention, the aluminum plastic film only comprising the inner plastic layer is soaked in the conductive cooling liquid, and the aluminum foil layer is electrically communicated with the conductive cooling liquid. Under the rare circumstances, when the battery electrolyte passes inboard plastic layer and reaches the aluminium foil layer, the electrolyte forms the electricity with aluminium foil layer, electrically conductive coolant liquid and outside earth connection and communicates, and then can trigger the insulation resistance and report to the police, in time detect the corruption of hydrofluoric acid to the aluminium foil to prevent dangerous emergence such as electrolyte leakage. Therefore, the traditional anti-corrosion treatment is not carried out on the inner side of the aluminum-plastic film aluminum foil in the thermal management system, and the safety performance of the battery and the whole system can still be ensured.
The invention also provides the following aluminum-plastic film, wherein the aluminum-plastic film or the aluminum foil layer thereof has the following performance of resisting the corrosion of cooling liquid: the corrosion resistance test method is an OY aqueous Solution (OYama Water Solution) corrosion test; the corrosion resistance life of the aluminum plastic film or the aluminum foil layer thereof in the test is more than 500 hours. Further, the corrosion resistance life of the aluminum-plastic film or the aluminum foil layer thereof is more than 1000 hours. Furthermore, the corrosion-resistant life of the aluminum-plastic film or the aluminum foil layer thereof is more than 2000 hours.
The aluminum foil thickness of the aluminum plastic film meeting the requirements of the OY aqueous solution on corrosion resistance in the invention is preferably more than 80 microns, more preferably more than 100 microns, and even more preferably 120 microns to 300 microns.
Or the aluminum-plastic film or the aluminum foil layer thereof has the following coolant corrosion resistance: OY aqueous corrosion test, or internal corrosion resistance test in ASTM D2570 standard; the corrosion life of the aluminium-plastic film or its aluminium foil layer in the above test is more than 150 hours, or more than 200 hours, or more than 336 hours. Further, the corrosion resistance life of the aluminum-plastic film or the aluminum foil layer thereof is more than 500 hours. Still further, the corrosion-resistant life of the aluminum-plastic film or the aluminum foil layer thereof is more than 1000 hours. Furthermore, the corrosion resistance life of the aluminum-plastic film or the aluminum foil layer thereof is more than 2000 hours; still further, the corrosion resistance life of the aluminum-plastic film or the aluminum foil layer thereof is more than 2500 hours.
In the prior art, the service life of an 8-series (such as 8021 or 8079) aluminum foil with the thickness of 40 micrometers in an OY aqueous solution corrosion test is about 98 hours, and the requirement on the design service life of a vehicle cannot be met at all, so that the requirement on an antifreezing solution immersion type cooling mode cannot be met. Therefore, if the above corrosion resistance is required, the aluminum foil in the aluminum plastic film needs to have a proper composition of the aluminum alloy material and/or a proper thickness.
The aluminum foil material meeting the requirement of the coolant corrosion resistance can be selected from the following materials: a single layer of 1-series aluminum alloy (pure aluminum), a single layer of 3-series aluminum alloy, or a composite layer aluminum alloy having a sacrificial anode protection function.
The thickness of the aluminum foil meeting the requirement of the coolant corrosion resistance can be selected from the following thicknesses: 80-120 microns, or 120-150 microns, or 150-200 microns, or 200-300 microns.
For example, pure aluminum AA1050 with the thickness of more than 150 micrometers, or composite layer aluminum alloy formed by compounding AA1050 with the thickness of 100 micrometers and AA7072 with the thickness of 20 micrometers (namely the total thickness of the composite layer aluminum alloy is 120 micrometers), the service life requirement of the anti-freezing solution corrosion resistance can be met by selecting the two aluminum foils for manufacturing the aluminum plastic film, and therefore the service life requirement of an automobile can be met.
In addition to solving the above corrosion life problem from the aluminum foil perspective, the present invention can also improve the water corrosion life problem of the aluminum plastic film from the outer plastic layer. Preferably, the outer plastic layer is a hydrolysis resistant plastic layer. Further, the outer plastic layer is a Teflon layer, or a PE layer, or a composite material of the PE layer and a PA layer, or a water resistance improvement layer of PA. Or if the outer side has no plastic layer, that is, the aluminum foil is an outer layer material, an anti-corrosion coating can be made on the outer surface of the aluminum foil layer, such as chromizing treatment or rare earth oxide treatment.
Alternatively, and as described from a vehicle application perspective, it is preferred that the aluminum plastic film or aluminum foil thereof has a life of greater than 5 years, preferably greater than 10 years, and more preferably greater than 15 years, against corrosion by cooling fluids, such as antifreeze fluids consisting primarily of ethylene glycol and water.
In the present invention, unless otherwise specified, the term "life" means that the aluminum plastic film and the aluminum foil thereof are not corroded and perforated during the life. In order to obtain the cooling liquid corrosion resistance, the aluminum foil in the aluminum-plastic film needs to be selected from the proper aluminum alloy materials and have enough thickness. For example, the aluminum plastic film is preferably composed of an aluminum foil layer and a thermoplastic resin film compounded on the aluminum foil, wherein the aluminum foil is a composite layer aluminum foil with a sacrificial anode function, and the thickness is preferably 100 to 300 micrometers. The existing aluminum-plastic film product does not consider the application of soaking in the antifreeze solution, and also does not have the function of not losing efficacy after being soaked in the antifreeze solution for a long time; the aluminum plastic film product of the invention has the special characteristics.
Furthermore, the aluminum plastic film or the aluminum foil thereof also has deep drawability or formability. Or the aluminum plastic film or the aluminum foil thereof also has good deep drawability or formability. Or the aluminum-plastic film also has good deep-drawing formability. Or the aluminum plastic film or the aluminum foil thereof also has good cupping value. Since the deep drawability can be measured in cup-burst value. For example, the depth of punch or cupping value of the aluminum foil in the aluminum plastic film or the aluminum plastic film is greater than 5mm, preferably greater than 10 mm, and more preferably greater than 12 mm, as tested by the GB/T4156-2007 Erichsen cupping test for thin metal sheets and strips. The punching depth value or the cupping value refers to that the aluminum plastic film or the aluminum foil thereof cannot be perforated after punching within the punching depth value or after cupping test.
Further, the invention also provides an aluminum-plastic film, which comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; wherein, the leather material positioned at the outer side of the core material is formed by compounding two layers of leather materials or more than two layers of leather materials, and the corrosion potential is reduced from inside to outside in sequence. Therefore, a surface corrosion gradient is formed, and the punctiform corrosion is more favorably prevented.
In order to form the potential gradient, the composite layer aluminum foil can be heated at high temperature, and the zinc element in the skin material is gradually diffused to the core material, so that the content of the zinc element is continuously and gradually changed and the corrosion potential is also continuously and gradually changed in the process of the aluminum foil layer from outside to inside, thereby avoiding the cliff-type change or mutation of the content of the zinc element and the corrosion potential, and being more beneficial to the conversion of the corrosion form into uniform laminar corrosion. The corrosion prevention mechanism of the composite layer aluminum foil is different from the traditional corrosion prevention coating treatment modes such as chromizing on the surface of the aluminum foil, the composite layer aluminum foil is made of aluminum, the corrosion state is improved by adjusting the corrosion potentials of different layers in the aluminum foil, namely, pitting corrosion is guided to be lamellar corrosion, and perforation of the aluminum foil and failure of a battery are prevented. If the aluminum foil is soaked in cooling water after chromizing treatment of the outer surface of the aluminum foil, although the corrosion rate of the aluminum foil can be reduced, the corrosion form of the aluminum foil cannot be improved, and the inhibition effect on the pitting corrosion is not large.
It should be noted that, after the high-temperature diffusion process, the boundaries between the layers of the composite layer are not well defined, and the composition and the potential between the layers are not abrupt changes in a stepwise manner, but rather are gradual changes. Therefore, the composite layer aluminum foil provided by the invention not only comprises the composition among a plurality of layers of different aluminum alloys before high-temperature treatment; also comprises a composite layer with gradually changed element content or gradually changed corrosion potential in the direction vertical to the surface of the aluminum foil after high-temperature treatment.
The pouch battery thermal control device as described above, further comprising a cooling liquid, the outer package of the pouch battery being in direct contact with the cooling liquid. Further, the cooling liquid included in the battery thermal control device is water, a mixed liquid containing ethanol and water, a mixed liquid containing ethylene glycol and water, a mixed liquid containing propylene glycol and water, or other antifreeze cooling liquids. The cooling liquids are cooling liquids commonly used in automobiles and industry at present, and are not insulating cooling media but conductive cooling liquids with conductive performance (including weak conductive performance); however, the above-mentioned conductive cooling liquid has advantages of high thermal conductivity, good fluidity, high thermal conductivity, and relatively low cost, compared to an insulating type cooling medium such as silicone oil or transformer oil.
On the basis, the invention provides a heat control device of the soft package battery, which comprises the soft package battery and cooling liquid, wherein the outer package of the soft package battery is directly contacted with the cooling liquid, and the soft package battery adopts one or more of the soft package batteries. Wherein the cooling liquid is conductive cooling liquid.
Further, this heat control device still includes mainboard and shell body, and mainboard and shell body form the seal chamber, and laminate polymer battery's electrode stretches out on the mainboard, and laminate polymer battery's body is arranged in the seal chamber.
Further, the thermal control device further comprises a partition; at least part of the surface of the separator is in direct contact with at least part of the outer surface of the soft package battery, and a fluid channel is arranged in the separator; a battery unit is formed by a plurality of soft package batteries, and the battery unit and the partition plate are arranged at intervals. The number of the soft package batteries can be 1, or 2, or more, and form one battery unit. Among these, the battery packaging material is preferably an aluminum plastic film. The partition plate is made of a metal material; the corrosion potential of the clapboard is equal to or negative to the corrosion potential of the aluminum foil in the aluminum plastic film. Further, the partition plate is made of a metal material; the corrosion potential of the partition board is negative to the corrosion potential of the aluminum foil in the aluminum-plastic film, or the corrosion potential of the partition board is equal to or negative to the corrosion potential of the skin material of the aluminum foil in the aluminum-plastic film. The baffle plays the effect of supporting laminate polymer battery and organizes the flow field effect, and the baffle can be the flat pipe of extrusion, also can be straight fin, the form of staggered sawtooth fin. The fin is one of the separators, or a fin separator having a fluid passage. The fin separators mainly play a role of separating adjacent battery cells to form flow channels, and supporting and fixing the battery cells; therefore, the fin spacer according to the present invention does not include fins such as pin fins that cannot support the battery cell. The battery cell is closely spaced to the fin spacer to form an integral body, and the integral body can be fastened together using a band or through-bolts, so that the thermal control system and the battery cell have reliable vibration resistance.
Furthermore, the periphery of the battery core body is sealed by the aluminum-plastic film, and only a battery electrode or an electrode connecting port extends out of the aluminum-plastic film; the battery thermal control device further comprises a mainboard, wherein a socket is arranged on the mainboard, and the battery is inserted into the mainboard through the socket from the part extending out of the aluminum plastic film.
Further, the battery heat control device further comprises an outer shell, an accommodating cavity is formed in the outer shell, the battery unit and the partition plate are arranged in the accommodating cavity of the outer shell, and the outer shell further comprises a fluid inlet and a fluid outlet.
Further, the main plate is located in the accommodating chamber of the outer case and divides the accommodating chamber into two parts, the first part accommodates the battery cell main body and the partition plate, the second part accommodates the electrode and/or the electrode connection port part protruding from the aluminum plastic film, and the first part and the second part are physically isolated from each other.
The battery heat control device can also comprise a cooling pump, a cooling liquid heat exchanger and a corresponding water pipe; or the invention provides a battery cooling system, which adopts the battery thermal control device and further comprises a cooling pump, a cooling liquid heat exchanger and a corresponding water pipe. Wherein, the cooling liquid heat exchanger is a gas-liquid heat exchanger for directly exchanging heat between the cooling liquid and the ambient air.
Due to the adoption of the battery heat control device, the heat exchange efficiency of the battery is very high, the heat transfer resistance between the battery body and the cooling liquid is very low, and the heat exchange temperature difference is very small; therefore, on the premise of ensuring that substances (such as electrolyte, diaphragm and solid electrolyte interface film SEI) in the battery body do not exceed the temperature, the cooling liquid can be allowed to have higher temperature, namely, the requirement of battery cooling on the outside is reduced, the cooling cost is reduced, and the gas-liquid heat exchanger can be used. Further, the cooling system may further include an electric heater for heating the battery.
In the above aluminum-plastic film resistant to corrosion by coolant and the pouch battery wrapped with the aluminum-plastic film according to the present invention, the aluminum foil layer is either initially in contact with the coolant as a water-contact layer, or is in contact with the coolant as a water-contact layer after an outer protective layer (e.g., a nylon film) is peeled off.
The invention provides another battery packaging material, which is formed by compounding a metal foil and a thermoplastic resin film positioned on the inner side of the metal foil; or a composite of a thermoplastic resin film, a metal foil and a heat-resistant resin film, the metal foil being located between the thermoplastic resin film and the heat-resistant resin film; the metal foil is a single-layer metal with corrosion resistance, or the metal foil comprises a core material and a skin material positioned outside the core material, and the corrosion potential of the skin material of the metal foil is lower than that of the core material. The metal foil is preferably an aluminum foil and/or a copper foil and/or a stainless steel foil. The thickness of the metal foil is preferably 20 to 50 microns, or 50 to 80 microns, or 80 to 150 microns, or 150 to 200 microns, or 200 to 300 microns. Preferably, the outer side of the metal foil does not contain a plastic film, i.e. the plastic film is only laminated to the inner side of the metal foil.
Alternatively, the metal foil layer may have an anticorrosion treated layer formed by chromate treatment or rare earth oxide treatment on the inner side.
From another angle, the invention also provides a soft package battery solution, namely, the soft package battery is packaged by an aluminum plastic film, and the soft package battery body has the following coolant corrosion resistance:
the corrosion resistance test method comprises the following steps: carrying out OY aqueous solution corrosion test;
the corrosion-resistant life of the pouch cell in the above test was greater than 500 hours by immersing the body of the pouch cell in a coolant.
Furthermore, the corrosion-resistant service life of the soft package battery body is longer than 1000 hours. Further, the corrosion-resistant service life of the soft package battery body is more than 2000 hours.
Alternatively, the corrosion resistance test method is an internal corrosion resistance test in ASTM D2570 standard, or the aluminum foil wrapped outside is evaluated by using a method similar to section 5.14 "internal corrosion resistance test" in QC/T468-2010 standard.
The OY aqueous Solution (OYama Water Solution) corrosion test in the invention is an OY aqueous Solution corrosion test which is commonly used in the heat exchanger aluminum heat transmission industry.
The invention relates to a method for manufacturing an aluminum-plastic film, which comprises the following steps: the corresponding aluminum foil is first selected by the following water-resistant solution corrosion test: the corrosion resistance test adopts an OY aqueous solution corrosion test method, and the corrosion resistance service life of the aluminum foil under the corrosion test method is more than 500 hours; then the aluminum foil and the plastic film are compounded to form the aluminum-plastic film.
Wherein the corrosion life is preferably more than 1000 hours. More preferably greater than 2000 hours. The aluminum foil may be selected from the above-mentioned pure aluminum or aluminum alloy.
Among the above schemes, the following scheme is a preferred scheme:
an aluminum-plastic film for packaging a soft package battery is formed by compounding an aluminum foil layer and a thermoplastic resin film positioned on the inner side of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; the core material is 1 series aluminum alloy or 8 series aluminum alloy, the skin material is formed by adding 1-10% of zinc element by mass percent on the basis of the 1 series aluminum alloy or 8 series aluminum alloy, and the thickness of the aluminum foil layer in the aluminum-plastic film is 300 microns; the outside on aluminium foil layer does not contain plastic film, and when the laminate polymer battery who adopts this plastic-aluminum membrane packing soaked in the cooling water heat transfer, the direct and cooling water contact heat transfer of aluminium foil in the plastic-aluminum membrane.
More preferably, the above-mentioned battery packaging material has the following characteristics
The core material comprises an aluminum alloy comprising:
si is less than or equal to 0.25 wt%; cu is less than or equal to 0.05 wt%; mg is less than or equal to 0.05 wt%; zn is less than or equal to 0.05 wt%; mn is less than or equal to 0.05 wt%; ti is less than or equal to 0.03 wt%; v is less than or equal to 0.05 wt%; fe is less than or equal to 0.4 wt%; the rest is aluminum;
the leather material at least comprises an aluminum-zinc alloy containing the following components:
Zn 4-7wt%；Si 0.5-1.0wt%；Ti 0.1-0.2wt%；Fe 0.5-1.5wt%；
or;
the core material comprises an aluminum alloy comprising:
si is less than or equal to 0.25 wt%; cu is less than or equal to 0.05 wt%; mg is less than or equal to 0.05 wt%; zn is less than or equal to 0.05 wt%; mn is less than or equal to 0.05 wt%; ti is less than or equal to 0.03 wt%; v is less than or equal to 0.05 wt%; fe is less than or equal to 0.4 wt%; 0.1 to 0.3 weight percent of Sm; the rest is aluminum;
the leather material at least comprises an aluminum-zinc alloy containing the following components:
Zn 4-7wt%；Si 0.5-1.0wt%；Ti 0.1-0.2wt%；Fe 0.5-1.5wt%；Sm 0.1-0.3wt%。
a soft-package battery thermal control device is characterized in that the soft-package battery is packaged by the packaging material; the resin film on the inner side of the aluminum foil layer isolates the electrolyte of the soft package battery from the aluminum foil layer; the thermal control device for the soft package battery further comprises a sawtooth fin and water-based cooling liquid, wherein the battery unit and the sawtooth fin are arranged at intervals, at least part of the surface of the sawtooth fin is in direct contact with at least part of the outer surface of the soft package battery, the plurality of soft package batteries form a battery unit, and the sawtooth fin separates the adjacent battery units and supports and fixes the battery units; the water-based cooling liquid flows in the sawtooth fins between the adjacent battery units, and the water-based cooling liquid is in direct contact with the soft package battery for heat exchange.
In a more preferred embodiment of the present invention, the aluminum foil of the aluminum plastic film is laminated with a thermoplastic plastic film only on the inside thereof, i.e., the heat-resistant plastic film or the protective film is not contained on the outside thereof. Compared with the traditional aluminum-plastic film, the aluminum-plastic film provided by the invention has the advantages that the cooling water corrosion resistance and the mechanical strength of the aluminum foil in the aluminum-plastic film are improved, the aluminum-plastic film without the plastic film on the outer side is durable and reliable, the process is simpler and more convenient, the cost is lower, and when the aluminum-plastic film is in contact with cooling water for heat exchange, the heat exchange efficiency is higher; more importantly, the aluminum-plastic film disclosed by the invention also has a new function, namely has a function of resisting cooling water corrosion for a long time, so that the aluminum-plastic film can be soaked in the cooling water for a long time without losing efficacy, thereby meeting the heat management requirement of a soaking type water-cooled soft package battery cooling system and providing a reliable guarantee for improving the performance of a battery system.
In another more preferable scheme among the technical schemes provided by the invention, the aluminum foil in the aluminum-plastic film adopts a composite layer aluminum foil with different corrosion potentials matched between the internal layers, so that the corrosion form of the aluminum foil tends to lamellar corrosion, and the corrosion perforation failure of the aluminum foil in the aluminum-plastic film is better avoided.
Different from other composite layer aluminum foils, one of the more preferable schemes of the aluminum foil for packaging the soft package battery is to adopt a pure aluminum core material and a skin material added with zinc on the basis of pure aluminum to be compounded, and the aluminum foil not only has excellent cooling water pitting corrosion resistance, but also has better formability and packability.
The aluminum plastic film provided by the invention can also be formed by combining the technical characteristics, can be used for packaging soft package batteries directly contacted with cooling water, and has the advantages of cooling water corrosion resistance and long service life.
Drawings
FIG. 1 is a schematic structural view of a first aluminum-plastic film;
FIG. 2 is a schematic structural view of a second aluminum-plastic film;
FIG. 3 is a schematic diagram of a battery using the aluminum-plastic film of the present invention;
fig. 4 is a schematic diagram of a pouch cell;
FIG. 5 is a schematic diagram of a pouch cell thermal control device;
FIG. 6 is a schematic structural view of a third aluminum-plastic film;
FIG. 7 is a graph showing the effect of a corrosion resistance comparison test between a single-layer aluminum alloy (left view) and a composite-layer aluminum alloy (right view);
the fin partition shown in fig. 8 is a staggered sawtooth fin, and includes a plurality of tooth-shaped units, the inside of the same row of tooth-shaped units is communicated to form a fluid channel, adjacent tooth-shaped units are staggered front and back, and the top and bottom planes of the tooth-shaped units are in direct contact with the battery;
the fin spacer shown in fig. 9 is a flat fin comprising parallel vertical plates and upper and lower flat plates connected to both ends of the vertical plates, the flat plates are in direct contact with the battery, and fluid passages are formed between the vertical plates.
Detailed Description
The present invention is further described below with reference to specific examples, but the scope of the present invention includes, but is not limited to, these.
Example 1
The attached drawing 1 provides an aluminum-plastic film, which comprises an aluminum foil layer 1 and plastic layers 2 and 3 compounded on the two side surfaces of the aluminum foil layer, wherein the aluminum foil layer 1 is formed by compounding a 3-series aluminum alloy aluminum foil layer 7 (core material) and a 7-series aluminum alloy aluminum foil layer 6 (skin material). If the 3003 aluminum alloy and the 7072 aluminum alloy are compounded, the 7072 aluminum alloy layer 6 is compounded on the outer side of the 3003 aluminum alloy layer 7. Alternatively, the aluminum plastic film is formed by laminating a heat seal layer, a3003 aluminum foil layer, a7072 aluminum foil layer and a nylon layer in this order, wherein the aluminum foil layer and the plastic layer are bonded by a conventional adhesive. Or, the aluminum-plastic film comprises the following layers from inside to outside: the aluminum foil comprises a heat sealing layer, an adhesive layer, a3003 aluminum foil core layer, a7072 aluminum foil skin layer, an adhesive layer and a nylon protective layer.
The corrosion potential of the 3003 aluminum alloy is about-0.72V and the corrosion potential of the 7072 aluminum alloy is about-0.88V. Since the corrosion potential of 7072 aluminum alloy is lower than that of 3003 aluminum alloy, 7072 aluminum alloy acts as a sacrificial anode when in contact with the coolant, protecting the core from corrosion. The thickness of the heat sealing layer is preferably 80-100 microns, the thickness of the nylon protective layer is preferably 20-30 microns, and the thickness of the composite aluminum foil layer is preferably 200-300 microns; among them, the thickness of the 7-series aluminum alloy layer 6 is preferably 10% of the entire aluminum foil layer 1. Similarly, the inner and outer plastic layers 2 and 3 are bonded and compounded with the aluminum foil layer 1 through adhesives 4 and 5 respectively.
The heat-treated state of the aluminum foil layer may be an O state, an H14 state, or an H16 state, with an O state being preferred.
The aluminum foil layer of this embodiment is thicker than the aluminum foil layer in traditional plastic-aluminum membrane, so both be favorable to long-term anti-icing fluid corrosion resistance, be favorable to the steam separation nature of plastic-aluminum membrane again to the long-term reliability of guarantee laminate polymer battery packing.
Example 2
In this embodiment, the aluminum alloy layer 1 is also formed by compounding the core material 7 and the sheath material 6, and the sheath material 6 is an anode protective layer, substantially similarly to the structure of embodiment 1. Except that the 7072 aluminum alloy was replaced with a3003 aluminum alloy with added zinc Zn (3003 +1% Zn or 3003+1.5% Zn as shown below) as the sacrificial anode layer. 3003+1% Zn has a potential of about-0.83V to-0.89V, which is lower than that of 3003 core material.
TABLE 1 chemical composition of the alloys
Example 3
Referring to fig. 2, a second aluminum-plastic film is provided, which includes an aluminum foil layer 1 and a thermoplastic resin film layer 3 laminated on an inner side of the aluminum foil layer, wherein the aluminum foil layer is a composite aluminum foil, the aluminum foil layer includes a core material and a skin material on an outer side of the core material, and a corrosion potential of the skin material of the aluminum foil layer is lower than a corrosion potential of the core material. Further, the core material of the aluminum foil layer is formed of corrosion-resistant aluminum alloy or pure aluminum. For example, the composite aluminum foil layer 1 is formed by compositing a 3-series aluminum foil layer 7 (e.g., 3003) and a 7-series aluminum foil layer 6 (e.g., 7072). The aluminum foil layer 1 is only compounded with the thermoplastic resin film layer 3 (also called heat sealing layer 3, for example, using CPP) on the inner side, and an outer nylon protective layer is not needed.
The heat seal layer 3 (CPP) thickness is preferably 30-50 microns and the overall composite aluminium foil layer 1 thickness is preferably 200 microns. Wherein, a 7-series aluminum alloy layer 6 is compounded on the outer side to be used as a sacrificial anode; the thickness of the 7-series aluminum alloy is preferably 10% of the entire aluminum foil layer 1. When used as a pouch battery package and the battery is immersed in cooling water, the 7-series aluminum alloy serves as a water contact layer. The inner thermoplastic resin film layer 3 and the aluminum foil layer 1 are bonded and compounded through a common adhesive 5 for aluminum plastic films. The soft package battery made of the aluminum plastic film can be soaked in cooling liquid for a long time, and has a long-term cooling liquid corrosion resistance function.
Example 4
This example is generally similar to example 3 in structure, but the core layer is also 3003 aluminum alloy, except that the skin material 6 is a zinc (Zn) metal layer instead of a 7-series aluminum foil layer, the zinc metal layer may preferably have a thickness of 10-20 μm, and may be formed by a zinc spray process. The metal zinc has a lower potential than the aluminum alloy core material, and therefore can be used as a sacrificial anode to protect the core material from corrosion. And the metal zinc can also effectively prevent the pitting corrosion of the aluminum alloy core material.
Example 5
This example describes a battery using the above aluminum plastic film and an application of the battery. The soft package battery comprises an electrode material, a polymer electrolyte and an aluminum-plastic film for external wrapping, wherein the soft package battery is wrapped by the aluminum-plastic film comprising a composite layer aluminum foil with a sacrificial anode function, such as the composite layer aluminum alloy aluminum foil in embodiment 1 or 3, namely the aluminum foil is a3003 aluminum alloy core material and externally compounded with a7072 aluminum alloy skin material. After the soft package battery is packaged by the aluminum plastic film resistant to soaking corrosion of the anti-freezing cooling liquid, the soft package battery can be soaked in the anti-freezing cooling liquid, so that heat exchange can be directly carried out with the anti-freezing cooling liquid. As shown in fig. 3, after the pouch cell 11 is sealed with the main board 13 by the top edge 112, the body of the pouch cell 11 is immersed in the antifreeze coolant. Therefore, the heat exchange effect of the battery is better, and the temperatures of the upper part, the lower part, the left part and the right part of the battery are more uniform.
Example 6
This example uses an aluminum plastic film structure similar to that of example 1, except that the adhesive for adhering the nylon protective layer uses a release agent for easy separation. I.e. the nylon protective layer is similar to a release film. Therefore, the nylon layer can protect the aluminum foil layer in the deep drawing forming process of the aluminum plastic film; after the completion of the deep drawing, the nylon layer can be easily separated from the aluminum foil layer, thereby forming an aluminum-plastic film similar to that of example 3.
Example 7
The aluminum-plastic film described in this embodiment is formed by laminating a thermoplastic resin film (i.e., a heat seal layer, such as polypropylene) and a composite layer of aluminum alloy and aluminum foil. The core material layer 7 of the aluminum foil layer is made of 1050 pure aluminum, the skin material 6 is made of aluminum alloy (simplified and expressed as AA1050+4-7% Zn) added with 4% -7% of zinc element on the basis of the pure aluminum 1050, the corrosion potential of the skin material is negative to the core material, the skin material serves as a sacrificial anode protection core material, and the skin material compounding ratio is preferably 10 +/-2%. The heat treatment state of the composite aluminum alloy aluminum foil layer is an annealing state (O state), and the thickness is preferably 100-300 microns, and more preferably 200-300 microns. The composite aluminum foil layer has excellent cooling liquid corrosion resistance, and good ductility and deep drawing performance.
The plastic-aluminum film or the aluminum foil thereof is required to have better ductility and deep drawing performance, for example, the cup drawing value of the plastic-aluminum film or the aluminum foil thereof is preferably more than 5mm, more preferably more than 10 mm, as tested by GB/T4156-2007 Eriken cup drawing test for thin metal sheets and thin strips.
The aluminum plastic film or the aluminum foil thereof is required to have better coolant corrosion resistance. The corrosion resistance test method adopts an OY aqueous Solution (OYama Water Solution) corrosion test commonly used in the heat exchanger thermite transmission industry, and the specific test method introduction can also refer to the OY aqueous Solution corrosion test in example 1 in CN 201080021209.6. The OY aqueous corrosion test is approximately as follows:
composition of aqueous OY solution: chloride ion (Cl)-) 195 +/-1 mg/L, sulfate ion (SO)4 2-) 60 + -0.2 mg/L, iron ion (Fe)3+) 30 + -0.1 mg/l, copper ion (Cu)2+) 1 +/-0.01 mg/L. The pH of the aqueous OY solution was about 3 (unless otherwise specified, the pH of the aqueous OY test of the present invention was about 3).
Temperature of aqueous OY solution: stirring at 88 ℃ for 8 hours at a speed of 0.6-0.9 m/s (200rpm), and then standing for 16 hours; the above cycle is repeated.
In the OY aqueous corrosion test described above, any perforations 5mm near the edge of the aluminum foil were ignored. When any point except the edge 5mm of the aluminum foil is subjected to corrosion perforation, the accumulated corrosion test time is the corrosion resistance life of the aluminum plastic film aluminum foil in the OY aqueous solution. Experiments show that the corrosion resistance service life of the aluminum foil is more than 1000 hours.
The corrosion life of the plastic-aluminum film or its aluminum foil can also be evaluated by its corrosion life when immersed in the anti-freezing solution on a real vehicle, for example, the plastic-aluminum film with a life of more than 5 years, preferably more than 10 years, and more preferably more than 15 years, is selected on a real vehicle.
Example 8
As shown in fig. 4 and 5, the thermal control apparatus for a battery according to the present embodiment employs the pouch cell that can be directly immersed in a cooling fluid (e.g., a cooling fluid mainly composed of glycol and water) for a long period of time. The heat control device for the soft package battery comprises the soft package battery 11 and a water-based cooling liquid, wherein an outer package of the soft package battery 11 is in direct contact with the cooling liquid, and the soft package battery 11 is made of any one of the above packaging materials (such as an aluminum-plastic film resistant to corrosion of the water-based cooling liquid). The thermal management device further comprises a spacer 12, the spacer 12 preferably being a staggered serrated fin spacer as shown in FIG. 8 or a straight fin spacer as shown in FIG. 9; at least part of the surface of the separator 12 is in direct contact with at least part of the outer surface of the soft package battery 11, a fluid channel 121 is arranged in the separator 12, the fluid channel 121 is in direct contact with the battery 11, and cooling water in the fluid channel 121 is in direct contact with the battery 11 for heat exchange; one pouch battery 11 constitutes one battery unit (of course, two pouch batteries may be used to constitute one battery unit), and the battery unit is disposed at an interval from the separator 12. The separator plate plays a role in supporting the soft package battery on one hand, and plays a role in organizing a cooling liquid flow field on the other hand.
The periphery of the battery core body is sealed by the aluminum-plastic film, and only a battery electrode or an electrode connecting port extends out of the aluminum-plastic film; the battery thermal control device further comprises a main board 13, wherein a socket is arranged on the main board 13, and the battery extends out of the aluminum plastic film (namely, the positive and negative electrode tabs 111) and is inserted into the main board 13 through the socket. Preferably, part of the top edge 112 of the battery is also inserted onto the main board 13 through said socket.
The battery thermal control device further comprises an outer casing 14, wherein the outer casing 14 is internally provided with a containing cavity, a plurality of battery units and a separator 12 are tightly integrated and embedded into the containing cavity of the outer casing 14, and the outer casing 14 further comprises a fluid inlet and a fluid outlet (not shown in the figure).
The main plate 13 is located in the housing chamber of the outer case 14 and partitions the housing chamber into two parts, a first part housing the cell main body and the separator 12, and a second part housing the electrode and/or the electrode connection port part protruding from the aluminum plastic film, the first part and the second part being physically isolated from each other.
The battery thermal control device also comprises cooling liquid, wherein the cooling liquid is water, or mixed liquid containing ethylene glycol and water, or mixed liquid containing propylene glycol and water, or anti-freezing cooling liquid.
Preferably, the separator 12 is made of a metal material, and the corrosion potential of the separator 12 is negative to the corrosion potential of the aluminum foil in the aluminum plastic film, for example, the metal foil of the packaging material is AA1050 aluminum alloy, and the separator 12 is AA1050+5% Zn. Or, the corrosion potential of the partition board 12 is negative to that of the skin material of the aluminum foil of the aluminum plastic film, for example, the metal foil of the packaging material is made of AA1050/AA1050+5% Zn aluminum alloy, and the partition board 12 is made of AA1050+7% Zn. Thus, the separator can also play a role in protecting the anode and further prevent the corrosion failure of the battery.
Example 9
This example was the same as the aluminum foil used in example 7, except that the aluminum foil material and the aluminum plastic film excellent in formability (or deep drawability) were evaluated and selected in the following manner.
The moldability test and evaluation were conducted in accordance with the following A to F:
A. the mold core is made of Teflon material, the size of the mold is 34mm multiplied by 44mm, and the round angle R =0.6 mm. Adjusting the forming depth of the punch forming tester to a value between 5.0mm and 15.0mm according to the test requirements, and adjusting the pressure of compressed air to ensure that the side pressure of the die is more than or equal to 3.0 MPa.
B. And (3) taking a sample film with a smooth and clean surface and no wrinkles, and cutting the film with the width of not less than 100 mm and the length of not less than 200 mm for testing.
C. And (4) enabling the CPP surface of the film to face the mold core, and putting the mold core into a punch forming tester. The film is ensured to be flat and wrinkle-free, and the side pressure film allowance is sufficient.
D. And pressing the button to perform punch forming, and carefully taking out the sample for later use after the punch forming is completed.
E. Combine together the CPP face of stamping forming back sample with the CPP face of not stamping forming sample, guarantee that the sample levels no deformation, be not more than 2 mm department along stamping forming edge and carry out the heat-seal, the heat-seal condition is: the heat-sealing temperature was 190 ℃ (heated uniformly from top to bottom), the heat-sealing pressure was 0.2 MPa, and the heat-sealing time was 6 seconds.
F. And (4) carrying out visual inspection on the punch forming sample after heat sealing, and checking whether the sample has the phenomena of cracking and layering.
According to the method, the forming depth of the aluminum-plastic film is more than 5.0 mm; more preferably, the aluminum plastic film or the aluminum foil with the molding depth of more than 10.0mm is screened out.
Example 10
This example is the same as the aluminum foil used in example 7, except that instead of evaluating the OY test, the corrosion life of the aluminum foil of the aluminum plastic film was evaluated using an "internal corrosion performance test" similar to section 5.14 of the QC/T468-.
Wherein, the corrosion resistance test detection in section 5.14 of the QC/T468 standard is approximately as follows:
test temperature: 88 ℃ C
Flow rate of mixed solution: 1.3-1.6L/s (liter per second)
Mixing the solution:
the type of the anti-freezing solution is as follows: 45% of ethylene glycol antifreeze, freezing temperature: -30 ℃ C
ASTM water: 1L (liter) of distilled water contained 148 mg (mg) of sodium sulfide, 165mg of sodium chloride, 138mg of sodium bicarbonate.
Mixing ratio: 40% antifreeze solution +60% ASTM water.
The experimental result shows that the corrosion-resistant service life of the aluminum foil is more than 1000 hours.
Example 11
The core material and the skin material of the composite layer aluminum alloy can be selected from any one of options 1 to 4 of the following table 2:
TABLE 2
With the method of example 7, the corrosion life of the aluminum foil of this example is greater than 1000 hours, and even greater than 1500 or 2000 hours.
Example 12
The embodiment provides an aluminum-plastic film, which comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; wherein, the leather material positioned at the outer side of the core material is formed by compounding two layers of leather materials or more than two layers of leather materials, and the corrosion potential is reduced from inside to outside in sequence.
For example, the aluminum foil layer in the aluminum-plastic film sequentially comprises a core material, a first layer of skin material and a second layer of skin material from inside to outside, wherein the core material is AA1050 aluminum alloy, the first layer of skin material is AA1050 aluminum alloy added with 2% of Zn, and the second layer of skin material is AA1050 aluminum alloy added with 4% of Zn. Therefore, the corrosion potential is: core material > first layer skin material > second layer skin material. Therefore, the corrosion can be further guaranteed to be layered corrosion of layer-by-layer corrosion, so that the punctiform corrosion is further avoided, and the safety of the battery is guaranteed.
Example 13
The present embodiment provides another corrosion resistance test of an aluminum plastic film aluminum foil for the outer package of a pouch battery, that is, a test method for anti-icing fluid corrosion resistance of a pouch battery. The test method is used for evaluating and measuring the anti-freezing fluid corrosion life of the product.
The body of a plurality of same soft-package batteries is soaked in a mixed solution, positive and negative electrode lugs of the soft-package batteries are vertically upward, and the immersion height of the mixed solution is flush with the lower edge of the top edge of the soft-package battery.
The components of the mixed solution are as follows: consists of 40 percent of antifreeze solution and 60 percent of ASTM solution by volume ratio. Wherein the antifreeze is 45% ethylene glycol antifreeze, and the freezing temperature is minus 30 ℃; the ASTM solution was prepared from 1 liter of distilled water with 148 milligrams of sodium sulfate, 165 milligrams of sodium chloride, and 138 milligrams of sodium bicarbonate.
Temperature of the mixed solution: 90 plus or minus 2 degrees centigrade. The flow direction of the mixed solution was a horizontal direction parallel to the maximum surface of the cell body, and the flow velocity of the mixed solution passing through the surface of the cell body was 0.5 m/s.
The test is operated for 76 hours at the temperature and the flow rate, the machine is stopped and kept still for 8 hours to form a cycle, the solution pH value inspection and the solution supplementation are carried out during the stopping, the solution inspection is divided into pH value inspection and appearance inspection, the pH value change of more than +/-1 is not allowed to occur in the test process, and the turbidity and the precipitation are not allowed to occur in the appearance of the solution.
The corrosion depth of the aluminum foil of the aluminum plastic film of the outer package of the battery can be checked at any time in the test process. And if the maximum value of the corrosion depth values of all the corrosion points is greater than 10% of the original thickness value of the aluminum foil, defining the test time accumulated when the maximum corrosion depth value reaches 10% of the original thickness value of the aluminum foil as the corrosion resistance life of the aluminum-plastic film aluminum foil for the outer package of the battery, namely the corrosion life of the anti-freezing solution for the soft package battery. Therefore, the lifetime in the test method of this embodiment is the accumulated test time for reaching the depth of corrosion.
In the above experiment, the above description of the present invention is based on different places, and the other places can refer to the Chinese automobile industry standard QC/T468-2010. It is worth mentioning that: the aluminum-plastic film for the external packaging of the soft-package battery is preferably an aluminum-plastic film consisting of an aluminum foil and a thermoplastic resin film compounded on the inner side of the aluminum foil, and no other plastic layer is arranged on the outer side of the aluminum foil, so that the aluminum foil is directly contacted with the antifreezing solution at first. However, the laminate battery outer packaging aluminum plastic film of the present invention may be (though not preferably) an aluminum plastic film composed of an aluminum foil, a thermoplastic resin film laminated on the inside of the aluminum foil, and a heat-resistant resin film laminated on the outside of the aluminum foil. Since a general heat-resistant resin film (e.g., PA or PET) is easily swollen and peeled by an antifreeze, the heat-resistant resin film outside the aluminum plastic film is peeled before the corrosion life test is performed, and then the corrosion test is performed in order to unify the test standards.
For the sake of brevityThe invention defines the corrosion resistance test of the aluminum plastic film aluminum foil for the outer package of the soft-package battery as'Anti-icing fluid corrosion life test of specific pouch cell”。
In order to meet the requirement of the automobile on the durability of parts, the soft package battery with the service life value of more than 336 hours in the anti-freezing solution corrosion life test of the specific soft package battery is selected. Since the power battery has very strict requirements on safety, the soft package battery is preferably used for more than 500 hours, and more preferably used for more than 1000 hours; further preferred are pouch cells for more than 2000 hours. Still further pouch cells preferably for greater than 5000 hours.
Another way of examination is provided as follows, in the above-mentioned "anti-freezing solution corrosion life test of the specific soft package battery", the test time is fixed to 14 days (namely 336 hours), and the pitting depths at all positions are examined, wherein the maximum pitting depth is required to be less than 50% of the original thickness value of the aluminum foil; preferably less than 20%, more preferably less than 10%; further preferably less than 8%; still more preferably less than 5%. Or the maximum pitting depth is 20-50% of the original thickness value of the aluminum foil, or more than 10% and less than 20%, or more than 0% and less than 10%.
If the above corrosion resistance is required, the aluminum foil in the aluminum-plastic film needs to have a proper composition of aluminum alloy material and a proper thickness.
The aluminum foil material meeting the requirement of the coolant corrosion resistance can be selected from the following materials: single layer 1 series aluminum alloy (pure aluminum) or composite layer aluminum alloy with sacrificial anode protection function.
The thickness of the aluminum foil meeting the requirement of the coolant corrosion resistance can be selected from the following thicknesses: 120-.
For example, pure aluminum AA1050 with the thickness of more than 150 micrometers, or composite layer aluminum alloy formed by compounding AA1050 with the thickness of 100 micrometers and AA7072 with the thickness of 20 micrometers (namely the total thickness of the composite layer aluminum alloy is 120 micrometers), the aluminum plastic film and the soft package battery made of the two aluminum foils can meet the anti-freezing solution corrosion life requirement, and therefore the automobile life requirement can be met.
Example 14
This example describes an aluminum-plastic film, in which an aluminum foil is formed by combining a core material and an outer skin material, wherein the core material is formed by an 8-series aluminum alloy (e.g., 8079 or 8021) of 100 micrometers to 300 micrometers, the outer skin material is formed by adding 2% to 6% by mass of zinc element to the 8-series aluminum alloy (as described in table 3 below), and the combination ratio is 10% to 20%. The aluminum-plastic film containing the composite aluminum alloy has good corrosion resistance and deep drawability, and the corrosion resistance life is longer than 1300 hours according to the test of the method of the embodiment 7.
TABLE 3
| Element(s) | Silicon | Iron | Copper (Cu) | Zinc | Aluminium | Others |
| Mass percent | 0.05-0.30 | 0.70-1.3 | ≤0.05 | 2.0-6.0 | Balance of | ≤0.15 |
Example 15
This example describes an aluminum-plastic film, in which an aluminum foil is formed by combining a core material and an outer skin material, wherein the core material is formed by a 1-series aluminum alloy (e.g. 1050) of 100-300 μm, the outer skin material is formed by adding 2-6% by mass of zinc element to the 1-series aluminum alloy (as shown in table 4), and the combination ratio is 10-20%.
Example 16
Wherein the core material is formed by 1 series aluminum alloy (such as 1050) of 100-300 microns, and the outer skin material is formed by adding 2-6% of zinc element by mass percent on the basis of the 1 series aluminum alloy (such as the aluminum alloy shown in Table 4). The aluminum-plastic film containing the composite aluminum alloy has good electrolyte corrosion resistance and good cooling water corrosion resistance; the corrosion life was greater than 1800 hours, tested according to the method of example 7.
TABLE 4
| Alloy element | Silicon Si | Fe | Copper Cu | Mn manganese | Magnesium Mg | Zn | Vanadium V | Titanium Ti | Aluminum Al | Others |
| Weight percent of | ≤0.25 | ≤0.40 | ≤0.05 | ≤0.05 | ≤0.05 | 2.0-6.0 | ≤0.05 | ≤ 0.03 | Balance of | ≤ 0.03 |
Example 17
The aluminum-plastic film comprises an aluminum foil layer and a plastic layer compounded on the surface of the aluminum foil layer, wherein the aluminum foil layer is made of 3003 aluminum alloy.
Referring to fig. 6, the aluminum-plastic film is composed of an outer protective layer 2, an aluminum foil layer 1 and an inner heat-sealing layer 3 from outside to inside in sequence, the outer protective layer 2 is made of nylon (ON), the inner heat-sealing layer 3 is made of cast polypropylene film (CPP), and the inner heat-sealing layer 3 also plays an insulating role at the same time, so that the electrical insulation between the aluminum foil layer 1 and the internal electrolyte is maintained. The outer protective layer 2, the inner heat-sealing layer 3 and the aluminum foil layer 1 are respectively bonded and compounded through adhesives (or adhesives) 4 and 5. Wherein the outer protective layer 2 serves to protect the aluminium foil layer 1 during the deep drawing process. The adhesive layer is composed of any one of polyester-urethane resin, polyether-urethane resin, isocyanate resin and unsaturated carboxylic acid-grafted polyolefin resin.
Above, the aluminum foil layer 1 can also be replaced by other rust-proof aluminum, such as 5 series rust-proof aluminum or other 3 series rust-proof aluminum, more specifically such as: 3004. 3005, 3105, 5052, 5086, etc.; the aluminum foil layer 1 may be replaced with 6-series aluminum alloy, such as 6063. Of course, the aluminum foil layer may be pure aluminum, which is 1050 aluminum alloy, 1060 aluminum alloy, 1100 aluminum alloy, or a modification based on the pure aluminum base. These pure aluminum also have good corrosion resistance.
The soft package battery formed by the aluminum plastic film can be directly soaked in cooling liquid, and has long-term cooling liquid corrosion resistance, wherein the cooling liquid is preferably water-based cooling liquid containing ethylene glycol or/and propylene glycol. In the process of forming the pouch battery, a deep drawing process is required, and the outer protective layer 2 provides protection for the aluminum foil layer 1 in the deep drawing process. After the pouch battery is soaked in the cooling liquid for a period of time, the nylon layer 2 may swell, dissolve and peel off, but the insulation property, the sealing property and the long-term cooling liquid corrosion resistance of the aluminum plastic film are not affected. Because the aluminum plastic film of the soft package battery has the function of long-term corrosion resistance to the cooling liquid, the soft package battery can be directly soaked in the cooling liquid for cooling. The soft package battery has the beneficial effects that the heat exchange efficiency of the soft package battery is very high, and the soft package battery cannot be overheated even when a large current does work, so that the power density and the reliability of the whole battery system can be improved.
Compared with 8 series aluminum alloy, 3 series or 5 series antirust aluminum has better anti-freezing liquid corrosion resistance, longer corrosion resistance life and more reliability.
Example 18
This example describes a pouch polymer lithium ion battery wrapped with the aluminum plastic film described in example 17, and is substantially the same as example 5, except that the aluminum foil used in the aluminum plastic film for packaging the pouch battery is formed of a single layer of aluminum alloy formed of a rust-resistant aluminum foil, such as 3003 aluminum foil.
Example 19
This example describes a pouch polymer lithium ion battery wrapped with the aluminum-plastic film described in example 17, which is substantially the same as example 5, except that the aluminum foil used in the aluminum-plastic film for packaging the pouch battery is formed of a single layer of aluminum alloy formed of a 1-series aluminum alloy foil, such as an O-state 1050 aluminum alloy aluminum foil or other pure aluminum.
Example 20
This example describes an aluminum-plastic film, in which an aluminum foil is formed by combining a core material and an outer skin material, wherein the core material is formed by an 8-series aluminum alloy (e.g., 8079 or 8021) of 150 micrometers to 300 micrometers, the outer skin material is formed by a 7-series aluminum alloy (e.g., 7072), and the combination ratio is 20% to 50%. Further, the 8 series and 7 series compounds are heated or annealed to form a gradient potential change by proper diffusion of Zn element. The aluminum-plastic film containing the composite aluminum alloy has good corrosion resistance and deep drawability, and the corrosion resistance life is longer than 1500 hours according to the test of the method of the embodiment 7.
Example 21
This example describes an aluminum-plastic film, which is formed by bonding a thermoplastic film (e.g., CPP), an aluminum foil layer, and a teflon film from the inside to the outside. Because the Teflon film has good water resistance and corrosion resistance, the soft package battery prepared from the aluminum plastic film can be soaked in water or antifreeze for a long time.
Example 22
Reference is made to example 7, but this example uses an aqueous OY solution having a pH of about 11. This example was carried out under the same conditions as in example 7 except that the pH of the aqueous OY solution was different from that of example 7. The embodiment of the invention selects the aluminum foil with the corrosion resistance service life longer than 1000 hours to be used as the aluminum plastic film for the battery packaging material.
Example 23
In this example, a corrosion resistance comparison test was performed on a single layer 1050 aluminum alloy and a composite layer aluminum alloy (a core material is 1050 aluminum alloy, and a skin material is a sacrificial layer with a negative potential) in an OY test.
An antifreeze solution system is selected to carry out an OY experiment, the experiment time is 4 weeks, and after the experiment, the surface of the material is soaked in nitric acid to remove corrosion products, and the specific conditions are as follows:
as shown in fig. 7, after the antifreeze system OY is tested for 4 weeks, the left graph shows that the AA1050 single-layer aluminum alloy undergoes more obvious pitting and the pitting is more serious; while the right figure shows that no significant pitting occurred on the aluminum alloy surface of the composite sacrificial layer. From this, it is found that the occurrence of pitting corrosion can be effectively suppressed by compounding a skin material having a relatively negative corrosion potential on the surface of the aluminum alloy core material. After the plastic layer on the inner surface of the aluminum plastic film formed by the composite layer aluminum foil is heat sealed, the time of the aluminum foil for resisting the corrosion of cooling water can meet the automobile requirement; meanwhile, as the core material on the inner side of the aluminum foil is pure aluminum, the electrolyte corrosion resistance of the aluminum foil is superior to that of the traditional iron-aluminum alloy, so that the service life and the safe use of the battery are ensured.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (3)
1. An aluminum-plastic film for packaging a soft package battery is formed by compounding an aluminum foil layer and a thermoplastic resin film positioned on the inner side of the aluminum foil layer; the aluminum foil layer is a composite layer aluminum foil and comprises a core material and a skin material positioned on the outer side of the core material, and the corrosion potential of the skin material of the aluminum foil layer is lower than that of the core material; the core material is 1 series aluminum alloy or 8 series aluminum alloy, the skin material is formed by adding 1-10% of zinc element by mass percent on the basis of the 1 series aluminum alloy or 8 series aluminum alloy, and the thickness of the aluminum foil layer in the aluminum-plastic film is 300 microns; the outside on aluminium foil layer does not contain plastic film, and when the laminate polymer battery who adopts this plastic-aluminum membrane packing soaked in the cooling water heat transfer, the direct and cooling water contact heat transfer of aluminium foil in the plastic-aluminum membrane.
2. The aluminum plastic film for packaging the soft-package battery according to claim 1,
the core material comprises an aluminum alloy with the following components:
Si≤0.25wt％；Cu≤0.05wt％；Mg≤0.05wt％；Zn≤0.05wt％；Mn≤0.05wt％；Ti≤0.03wt％；
v is less than or equal to 0.05 wt%; fe is less than or equal to 0.4 wt%; the rest is aluminum;
the leather material contains an aluminum-zinc alloy with the following components:
Zn 4-7wt％；Si 0.5-1.0wt％；Ti 0.1-0.2wt％；Fe 0.5-1.5wt％；
or;
the core material comprises an aluminum alloy with the following components:
Si≤0.25wt％；Cu≤0.05wt％；Mg≤0.05wt％；Zn≤0.05wt％；Mn≤0.05wt％；Ti≤0.03wt％；
v is less than or equal to 0.05 wt%; fe is less than or equal to 0.4 wt%; 0.1 to 0.3 weight percent of Sm; the rest is aluminum;
the leather material contains an aluminum-zinc alloy with the following components:
Zn 4-7wt％；Si 0.5-1.0wt％；Ti 0.1-0.2wt％；Fe 0.5-1.5wt％；Sm 0.1-0.3wt％。
3. a soft package battery thermal control device, wherein the soft package battery adopts the aluminum plastic film for packaging the soft package battery according to claim 1 or 2; the resin film on the inner side of the aluminum foil layer isolates the electrolyte of the soft package battery from the aluminum foil layer; the thermal control device for the soft package battery further comprises a sawtooth fin and water-based cooling liquid, wherein the battery unit and the sawtooth fin are arranged at intervals, at least part of the surface of the sawtooth fin is in direct contact with at least part of the outer surface of the soft package battery, the plurality of soft package batteries form a battery unit, and the sawtooth fin separates the adjacent battery units and supports and fixes the battery units; the water-based cooling liquid flows in the sawtooth fins between the adjacent battery units, and the water-based cooling liquid is in direct contact with the soft package battery for heat exchange.
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| CN107346806A (en) * | 2016-05-08 | 2017-11-14 | 谢彦君 | Efficient soft-package battery heat control device and cooling means |
| CN111430580A (en) * | 2020-03-31 | 2020-07-17 | 苏州锂盾储能材料技术有限公司 | Double PP-A L combined aluminum-plastic film and manufacturing method thereof |
| CN112635876A (en) * | 2020-12-31 | 2021-04-09 | 远景动力技术(江苏)有限公司 | Battery packaging structure, soft package lithium ion battery comprising battery packaging structure and preparation method |
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