CN104393203B - 一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜 - Google Patents
一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜 Download PDFInfo
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- 239000005030 aluminium foil Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 26
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 20
- 239000012785 packaging film Substances 0.000 title claims abstract description 14
- 229920006280 packaging film Polymers 0.000 title claims abstract description 14
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000004677 Nylon Substances 0.000 claims abstract description 16
- 229920001778 nylon Polymers 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 239000004743 Polypropylene Substances 0.000 claims abstract description 10
- 229920006267 polyester film Polymers 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 239000003792 electrolyte Substances 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- -1 polypropylene Polymers 0.000 claims abstract description 5
- 229920001155 polypropylene Polymers 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 12
- 239000002131 composite material Substances 0.000 abstract description 7
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 3
- 238000009820 dry lamination Methods 0.000 abstract description 3
- 238000012827 research and development Methods 0.000 abstract description 3
- 238000004381 surface treatment Methods 0.000 abstract description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 16
- 239000005020 polyethylene terephthalate Substances 0.000 description 16
- 239000010408 film Substances 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009459 flexible packaging Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,在铝箔的外表面通过粘接层复合有外层膜,外层膜为双轴半拉伸PET聚酯膜或采用PET粒子、粘接粒子、尼龙粒子三种粒子的共挤流延膜;将复合有外层膜的铝箔放入电解液中对铝箔的内表面进行单表面纳米处理,在铝箔的内表面形成纳米防腐层;再通过挤出复合在铝箔的纳米防腐层外复合有聚丙烯PP内层;使得单面化学处理成为可能,即减少了处理药剂的用量,同时又没改变传统的铝箔干式复合工艺,避免了研发尼龙或PET与经过表面化学处理过的铝箔的干式复合粘合剂及固化工艺。单面化学处理过程中,收放卷时,铝箔不易起皱,不会产生波纹,不影响后序工段的复合。
Description
技术领域
本发明涉及一种包装膜,特别是一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜。
背景技术
软包装锂电池用铝塑复合膜的中间层铝箔的内表面需要防止锂电池中高流动性、强渗透性、强溶解性及强腐蚀性电解液破坏铝箔与PPa之间的高强粘接性,使之分层,从而大大降低锂电池包装膜对内对外的高度阻隔性,而必须对与PPa相粘接的铝箔表面作纳米防腐处理。
该项目产品15年来一直垄断在日本DNP和昭和电工两家公司,国内100%进口,其中之一的技术难点便是铝箔的表面纳米化学处理。日本采用的方法是将铝箔直接放入化学处理液中,然后烘干,之后再在铝箔两面分别进行复合生产锂电池铝塑复合膜。1、日本先进的铝箔表面纳米处理设备可以保证软态铝箔经过放卷、表面处理、烘干、收卷的整个过程中,铝箔基本不受损伤,收卷整齐。不致于会影响到后面的铝箔两面复合。该工艺设备没现成的可买,即便委托日本订货,价格也非常昂贵,而国内又很难有此制造能力,这正是15年来制约该项目末能国产化的一大原因。2、从锂电池软包装膜的结构看,多年来一直是采用尼龙作为最外表面,而尼龙极易吸水,该水分除表面附着外,还极易形成结合水,铝箔表面纳米处理液是水常常溶剂,处理过程中的烘箱无法将水分特别是结合水烘干,该水分一定会部分转移至长期与之接触的锂电池铝塑膜内层将与电解液直接接触的PP表面上,水解产生的氢氟酸使电池气胀,还将随有机溶剂渗透到铝塑膜铝箔的内表面,腐蚀铝箔,从而破坏粘接层,使PP层与铝箔分层,这将加速锂电池内部电解液外渗和外部空气向电池内部渗透,使锂电池功能快速失效。
发明内容
本发明要解决的技术问题是针对现有技术的不足,提出了一种性能稳定、复合成本低、高效节能的采用铝箔单面纳米处理工艺的锂电池铝塑包装膜。
本发明要解决的技术问题是通过以下技术方案来实现的,一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,其特点是:
包括防腐蚀内层和高阻隔外层;
所述高阻隔外层包括铝箔层,在铝箔层的外表面通过粘接层复合有由双轴半拉伸PET聚酯膜或采用PET粒子、粘接粒子、尼龙粒子三种粒子的共挤流延膜构成的外层保护膜;
将复合有外层保护膜的高阻隔外层放入电解液中对铝箔的内表面进行单表面纳米处理,在铝箔层的内表面形成纳米防腐层;
所述防腐蚀内层采用聚丙烯PP材料通过挤出复合在高阻隔外层的纳米防腐层外;
所述外层膜的断裂强度≥150MPa,200≤断裂伸长率≤300。
所述外层膜的断裂强度≥150MPa和200≤断裂伸长率≤300。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现,所述双轴半拉伸PET聚酯膜是通过降低纵横向的拉伸比获得的,其再拉伸延展率提高50~100%。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现,铝箔层厚度为30~70μm,外层保护膜厚度为15~30μm,防腐蚀内层厚度为30~60μm。
本发明要解决的技术问题还可以通过以下技术方案来进一步实现,在铝箔层的内表面形成的纳米防腐层的厚度为5~20nm。
本发明与现有技术相比,先在铝箔的外表面复合外层膜,再对铝箔的内表面进行化学处理。由于外层膜采用双轴半拉伸PET聚酯膜或采用PET粒子、粘接粒子、尼龙粒子三种粒子的共挤流延膜替代尼龙,使得单面化学处理成为可能,即减少了处理药剂的用量,同时又没改变传统的铝箔干式复合工艺,避免了研发尼龙或PET与经过表面化学处理过的铝箔的干式复合粘合剂及固化工艺。单面化学处理过程中,收放卷时,铝箔不易起皱,不会产生波纹,不影响后序工段的复合。
具体实施方式
一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,
包括防腐蚀内层和高阻隔外层;
所述高阻隔外层包括铝箔层,在铝箔层的外表面通过粘接层复合有由双轴半拉伸PET聚酯膜或采用PET粒子、粘接粒子、尼龙粒子三种粒子的共挤流延膜构成的外层保护膜;
将复合有外层保护膜的高阻隔外层放入电解液中对铝箔的内表面进行单表面纳米处理,在铝箔层的内表面形成纳米防腐层;
所述防腐蚀内层采用聚丙烯PP材料通过挤出复合在高阻隔外层的纳米防腐层外;
所述外层膜的断裂强度≥150MPa,200≤断裂伸长率≤300。
所述外层膜的断裂强度≥150MPa和200≤断裂伸长率≤300。
所述双轴半拉伸PET聚酯膜是以聚对苯二甲酸乙二醇酯为原料,采用挤出法制成厚片,再经双向拉伸制成的薄膜材料。通过降低纵横向的拉伸比获得,其再拉伸延展率提高50~100%。
铝箔层厚度为30~70μm,外层保护膜厚度为15~30μm,防腐蚀内层厚度为30~60μm。
在铝箔层的内表面形成的纳米防腐层的厚度为5~20nm。
现有的铝箔两面同时进行化学处理,由于铝箔很软,以前是直接放卷和收卷,铝箔容易起皱,产生波纹,影响后序复合。本实施方式中先在铝箔的外表面复合外层膜,再对铝箔的内表面进行化学处理。这样收放卷时,铝箔不易起皱,不会产生波纹,不影响后序工段的复合。
由于外层膜采用双轴半拉伸PET聚酯膜或采用PET粒子、粘接粒子、尼龙粒子三种粒子的共挤流延膜替代尼龙,使得单面化学处理成为可能。PET不吸收水分,表面处理后的水分易于烘干,另外PET在电解液中性能稳定,可以擦干净,不像尼龙会立即溶解,破坏外表面,从而减少在锂电池注电解液过程中,发生意外溅到尼龙表面而产生外观上的废品。
即减少了处理药剂的用量,同时又没改变传统的铝箔与尼龙或铝箔与PET的干式复合工艺,避免了研发尼龙或PET与经过表面化学处理过的铝箔的干式复合粘合剂及固化工艺。
Claims (4)
1.一种采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,其特征在于:包括防腐蚀内层和高阻隔外层;
所述高阻隔外层包括铝箔层,在铝箔层的外表面通过粘接层复合有由双轴半拉伸PET聚酯膜或采用PET粒子、粘接粒子、尼龙粒子三种粒子的共挤流延膜构成的外层保护膜;
将复合有外层保护膜的高阻隔外层放入电解液中对铝箔的内表面进行单表面纳米处理,在铝箔层的内表面形成纳米防腐层;
所述防腐蚀内层采用聚丙烯PP材料通过挤出复合在高阻隔外层的纳米防腐层外;
所述外层膜的断裂强度≥150MPa,200≤断裂伸长率≤300。
2.根据权利要求1所述的采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,其特征在于:所述双轴半拉伸PET聚酯膜是通过降低纵横向的拉伸比获得的,其再拉伸延展率提高50~100%。
3.根据权利要求1所述的采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,其特征在于:铝箔层厚度为30~70μm,外层保护膜厚度为15~30μm,防腐蚀内层厚度为30~60μm。
4.根据权利要求1所述的采用铝箔单面纳米处理工艺的锂电池铝塑包装膜,其特征在于:在铝箔层的内表面形成的纳米防腐层的厚度为5~20nm。
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