WO2021147504A1 - 降低铝塑膜表面摩擦力的方法及其方法制备的铝塑膜 - Google Patents
降低铝塑膜表面摩擦力的方法及其方法制备的铝塑膜 Download PDFInfo
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- WO2021147504A1 WO2021147504A1 PCT/CN2020/131550 CN2020131550W WO2021147504A1 WO 2021147504 A1 WO2021147504 A1 WO 2021147504A1 CN 2020131550 W CN2020131550 W CN 2020131550W WO 2021147504 A1 WO2021147504 A1 WO 2021147504A1
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- Prior art keywords
- aluminum
- layer
- plastic film
- aluminum foil
- heat
- Prior art date
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- 239000002985 plastic film Substances 0.000 title claims abstract description 99
- 229920006255 plastic film Polymers 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 67
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 94
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000011888 foil Substances 0.000 claims abstract description 77
- 230000008569 process Effects 0.000 claims abstract description 34
- 238000003825 pressing Methods 0.000 claims abstract description 28
- 229920006015 heat resistant resin Polymers 0.000 claims abstract description 25
- 239000011265 semifinished product Substances 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 238000004381 surface treatment Methods 0.000 claims abstract description 19
- 239000000853 adhesive Substances 0.000 claims abstract description 15
- 230000001070 adhesive effect Effects 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 110
- 239000012790 adhesive layer Substances 0.000 claims description 21
- 239000000243 solution Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000012793 heat-sealing layer Substances 0.000 claims description 14
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 12
- -1 aluminum peroxide Chemical class 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000004840 adhesive resin Substances 0.000 claims description 8
- 229920006223 adhesive resin Polymers 0.000 claims description 8
- 230000020477 pH reduction Effects 0.000 claims description 8
- 150000002978 peroxides Chemical class 0.000 claims description 8
- 239000005025 cast polypropylene Substances 0.000 claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 235000006408 oxalic acid Nutrition 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 24
- 229910052744 lithium Inorganic materials 0.000 abstract description 24
- 239000000047 product Substances 0.000 abstract description 7
- 238000004080 punching Methods 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract 2
- 238000000926 separation method Methods 0.000 abstract 2
- 238000004806 packaging method and process Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000013329 compounding Methods 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- 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
-
- 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
Definitions
- the present invention relates to the technical field of aluminum plastic film for lithium battery packaging, relates to a method for reducing the surface friction of aluminum plastic film for lithium battery packaging and the aluminum plastic film for lithium battery packaging prepared by the method, and particularly relates to a method for reducing aluminum Plastic film surface friction method and aluminum plastic film prepared by the method.
- soft-pack lithium batteries have the advantages of high energy density, good safety performance, light weight, low internal resistance, and flexible design.
- the applied research of the company has become a research hotspot.
- aluminum-plastic film is the key material for the packaging of soft-package lithium battery cells.
- the aluminum-plastic film is composed of an outer protective layer (ON or PET, etc.) and an intermediate aluminum foil layer (AL layer) , A composite material composed of an inner heat-sealing layer (CPP or PP), and the layers are pressed and bonded by an adhesive.
- the battery is sealed with an aluminum-plastic film, and the aluminum-plastic film plays a role in protecting the contents.
- each layer has high requirements on materials and technology.
- the aluminum-plastic film passes through the channel, and the emulsion on the surface of the aluminum-plastic film is smoothed by a flexible scraper strip.
- the invention also provides an aluminum-plastic film coating device, which includes an unwinding mechanism, a winding mechanism, a guide roller, a coating tank and a flexible scraper strip. It can effectively reduce the friction coefficient of the aluminum-plastic film surface and improve the production quality of lithium batteries.
- an aluminum-plastic film coating device which includes an unwinding mechanism, a winding mechanism, a guide roller, a coating tank and a flexible scraper strip.
- the baking temperature is too high, the surface treatment of the aluminum-plastic film material, the spray coating method of the adhesive, etc., all have certain defects, which make the surface of the aluminum-plastic film The coefficient of friction is high, so that the punching depth of the aluminum-plastic film does not meet the production requirements, which in turn affects the production of lithium batteries and the quality of their production. Due to the deficiencies in the current process technology, the products prepared by it are difficult to meet the high-quality standards.
- the invention discloses a method for reducing the surface friction of an aluminum-plastic film.
- the aluminum-plastic film includes an outer, a middle, and an inner layer.
- the outer layer is a heat-resistant resin layer
- the middle is an aluminum foil layer
- the inner layer is a heat seal.
- Layer, the heat-resistant resin layer, the aluminum foil layer and the heat-sealable layer material that constitute the aluminum-plastic film are semi-finished products.
- the aluminum foil layer is an aluminum foil processed by a surface treatment process; an adhesive is applied between the layers through a composite main Compression, baking, and standing to form aluminum-plastic film, so that the produced aluminum-plastic film has high-quality and low-friction coefficient quality technical requirements, reduces the probability of constant temperature and humidity delamination, and improves the safety of lithium batteries. sex.
- the present invention is a method for reducing the surface friction of aluminum-plastic film.
- the aluminum-plastic film comprises three layers of outer, middle and inner layers.
- the outer layer is a heat-resistant resin layer
- the middle is an aluminum foil layer
- the inner layer is a heat-sealing layer.
- the aluminum foil layer is an aluminum foil processed by a surface treatment process; an adhesive is applied between the layers through a composite main pressure Combine, bake, and stand to make aluminum-plastic film, and the process and technical parameter steps are controlled as follows:
- the composite main pressing process is carried out, and the temperature during the composite main pressing process is controlled to be 55-65°C to obtain the composite semi-finished product;
- step (2) Place the composite semi-finished product of step (1) in a baking device for baking treatment, and control the baking temperature during the baking treatment to 40-50°C to obtain an aluminum-plastic film semi-finished product;
- step (3) The semi-finished aluminum-plastic film prepared in step (2) is removed from the baking device and allowed to stand for 1-3 days under normal temperature conditions to obtain a finished aluminum-plastic film.
- the temperature of the main pressing roller during the composite pressing process is controlled to be 60-62°C.
- the step (2) controls the baking treatment time to be 7-15 days.
- the method for reducing the surface friction of the aluminum-plastic film preferably, is to control the main pressing pressure during the composite main pressing process to be 0.15-0.25 mPa.
- the surface of the aluminum foil is acidified, and the acidification treatment time is controlled to be 15-30 minutes, which is an acidified aluminum foil;
- the solution for controlling the acidification treatment is a mixed solution prepared by mixing the following mass ratio components: phosphoric acid solution 30- 65%, 5-20% hydrochloric acid solution, 15-35% sulfuric acid solution, 10-15% oxalic acid;
- step 2) Put the acidified aluminum foil of step 1) in a hydrogen peroxide solution, and perform a peroxide treatment, and control the peroxide treatment time for 3-5 minutes, which is an aluminum peroxide foil;
- An aluminum-plastic film with low surface friction prepared by the method for reducing the surface friction of aluminum-plastic film as described above, comprising three layers of outer, middle and inner layers.
- the outer layer is a heat-resistant resin layer and the middle is The aluminum foil layer and the inner layer is a heat-sealing layer, characterized in that the heat-resistant resin layer is made of PA material, and the thickness of the heat-resistant resin layer is controlled to be 10-30 ⁇ m;
- the aluminum foil layer is an aluminum foil prepared after a surface treatment process, and the thickness of the aluminum foil is controlled to be 30um-50um;
- the heat seal layer is cast polypropylene or cast polyethylene, and the thickness of the heat seal layer is controlled to be 30 ⁇ m-90 ⁇ m;
- the heat-resistant resin layer and the aluminum foil layer are fixedly connected by an adhesive layer, and the aluminum foil layer and the heat-sealing layer are fixedly connected by an adhesive resin layer.
- the adhesive layer is a polyurethane adhesive, and the thickness of the adhesive layer after baking is controlled to be 2 ⁇ m-5 ⁇ m.
- the adhesive resin layer is a modified polyolefin adhesive, and the thickness of the adhesive layer after controlled baking is 3 ⁇ m-7 ⁇ m.
- the aluminum plastic film is characterized in that the thickness of the adhesive layer is 3-4 ⁇ m.
- the invention provides a method for reducing the surface friction of the aluminum-plastic film for lithium battery packaging and the aluminum-plastic film product prepared therefrom. It has the following technical advantages: it is mainly embodied in that it is applied to the existing semi-finished products after being glued at a low temperature.
- the pressing temperature is used for pressing, and the low temperature 40-50°C oven is used for baking during the baking, which reduces the production energy consumption and reduces the production cost;
- the second is to use the method of the present invention to prepare the finished aluminum-plastic film for lithium battery packaging.
- the erucamide in the material migrates from the inner surface of the film to the surface of the film at low temperature. In the pit, the friction on the surface of the aluminum plastic film is reduced;
- the third is that the aluminum-plastic film prepared by the method of the present invention reduces the friction on the surface of the film, increases the drawing formability of the aluminum-plastic film, reduces the probability of delamination at constant temperature and humidity, and improves the safety of the use of lithium batteries; For industrialized mass production.
- the method of the present invention solves the problems of insufficient punching depth when punching the shell with aluminum plastic film for lithium battery packaging, the punching shell is easy to be damaged, and the problems of constant temperature and humidity delamination; and the service life of the soft-packed lithium battery is prolonged.
- the invention discloses a method for reducing the surface friction of an aluminum-plastic film.
- the aluminum-plastic film includes an outer, a middle, and an inner layer.
- the outer layer is a heat-resistant resin layer
- the middle is an aluminum foil layer
- the inner layer is a heat seal.
- the aluminum foil layer is the aluminum foil processed by the surface treatment process; the adhesive is applied between the layers through the composite main
- the aluminum-plastic film is made by pressing, baking, and standing, which is characterized in that the steps of each process technology parameter are controlled as follows:
- the composite main pressing process is carried out, and the temperature during the composite main pressing process is controlled to be 55-65°C, and the temperature of the main pressing roller during the composite pressing process is preferably controlled to be 60-62°C , And control the pressing pressure during the compound pressing process to be 0.15-0.25mpa; make compound semi-finished products;
- step (2) Put the composite semi-finished product of step (1) in a baking device for baking treatment, and control the baking temperature during the baking treatment to 40-50°C, and at this temperature, control the baking treatment time for 7-15 days , Get the semi-finished product of aluminum plastic film;
- step (3) The semi-finished aluminum-plastic film prepared in step (2) is removed from the baking device and allowed to stand for 1-3 days under normal temperature conditions to obtain a finished aluminum-plastic film.
- the aluminum foil layer being an aluminum foil processed by a surface treatment process, including the following steps:
- the surface of the aluminum foil is acidified, and the acidification treatment time is controlled to be 15-30 minutes, which is an acidified aluminum foil;
- the solution for controlling the acidification treatment is a mixed solution prepared by mixing the following mass ratio components: phosphoric acid solution 30- 65%, 5-20% hydrochloric acid solution, 15-35% sulfuric acid solution, 10-15% oxalic acid;
- step 2) Put the acidified aluminum foil of step 1) in a hydrogen peroxide solution, and perform a peroxide treatment, and control the peroxide treatment time for 3-5 minutes, which is an aluminum peroxide foil;
- the invention discloses an aluminum-plastic film with low surface friction prepared by the method for reducing the surface friction of aluminum-plastic film as described above, comprising three layers of outer, middle and inner layers, and the outer layer is made of heat-resistant resin
- the layer and the middle are the aluminum foil layer and the inner layer is the heat-sealing layer, characterized in that the heat-resistant resin layer is made of PA material, and the thickness of the heat-resistant resin layer is controlled to be 10-30 ⁇ m;
- the aluminum foil layer is an aluminum foil prepared after a surface treatment process, and the thickness of the aluminum foil is controlled to be 30um-50um;
- the heat seal layer is cast polypropylene or cast polyethylene, and the thickness of the heat seal layer is controlled to be 30 ⁇ m-90 ⁇ m;
- the heat-resistant resin layer and the aluminum foil layer are fixedly connected by an adhesive layer, and the aluminum foil layer and the heat-sealing layer are fixedly connected by an adhesive resin layer;
- the adhesive layer is a polyurethane adhesive, and the thickness of the adhesive layer after baking is controlled to be 2 ⁇ m-5 ⁇ m.
- the adhesive resin layer is a modified polyolefin adhesive, and the thickness of the adhesive layer after controlled baking is 3 ⁇ m-7 ⁇ m.
- the thickness of the adhesive layer is 3-4 ⁇ m.
- the aluminum-plastic film includes an outer heat-resistant resin layer, an aluminum foil layer in the middle, and an inner heat-seal layer.
- the heat-resistant resin layer is made of PA material and has a thickness of 10- 30 ⁇ m
- the aluminum foil layer is an aluminum foil prepared by a surface treatment process, that is, an aluminum foil processed by the surface treatment process, including the following steps:
- the surface of the aluminum foil is acidified, and the acidification treatment time is controlled to be 15-30 minutes, which is an acidified aluminum foil;
- the solution for controlling the acidification treatment is a mixed solution prepared by mixing the following mass ratio components: phosphoric acid solution 30- 65%, 5-20% hydrochloric acid solution, 15-35% sulfuric acid solution, 10-15% oxalic acid;
- step 2) Put the acidified aluminum foil of step 1) in a hydrogen peroxide solution, and perform a peroxide treatment, and control the peroxide treatment time for 3-5 minutes, which is an aluminum peroxide foil;
- the heat-sealing layer is cast polypropylene or cast polyethylene with a thickness of 30 ⁇ m-90 ⁇ m, the heat-resistant resin layer and the aluminum foil layer are fixedly connected by an adhesive layer, and the aluminum foil layer and the heat-sealing layer are connected by an adhesive resin layer
- the adhesive layer is a polyurethane adhesive, and the thickness of the adhesive layer after baking is 2 ⁇ m-5 ⁇ m.
- the adhesive resin layer is a modified polyolefin adhesive, and the thickness of the adhesive layer after baking is 3 ⁇ m-7 ⁇ m.
- the semi-finished product of the aluminum-plastic film for encapsulation of lithium batteries After coating the semi-finished product of the aluminum-plastic film for encapsulation of lithium batteries, it is subjected to 60°C main pressing and compounding, and then rewinding and putting it in a 40-50°C oven for 7-15 days, leaving the oven to stand for 1-
- the finished aluminum-plastic film can be obtained in 3 days. Test the surface friction force; the following examples are the same as Example 1 where they are not described.
- the existing semi-finished products are glued and subjected to 60°C main pressing and compounding, they are rolled into an oven at 45-50°C and baked for 7-15 days, and left the oven to stand for 12 hours; the surface friction is tested.
- a friction tester cut the finished aluminum-plastic film prepared by the method of the present invention into 17*17mm squares and 25*50mm splines, and use the friction tester to test the friction force (PP face PP face friction, PA face For the PA surface friction), record the friction data, and then carry out the shell punching test and the constant temperature and humidity test, and record the data as well.
- Example 2 0.563 0.265 8NG/50pcs 3NG/50pcs
- Example 3 0.502 0.23 9NG/50pcs 4NG/50pcs Comparative example 1 0.216 0.099 0NG/50pcs 0NG/50pcs
- Example 1 Comparing Example 1, Example 2, Example 3 and Comparative Example 1 of the present invention, there is no difference between Example 1 and Comparative Example 1, which shows that the lithium prepared by the method of reducing the surface friction of aluminum plastic film of the present invention Aluminum-plastic film products for battery packaging have low surface friction.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Laminated Bodies (AREA)
Abstract
一种降低铝塑膜表面摩擦力的方法及其方法制备的铝塑膜，所述铝塑膜包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，将构成铝塑膜的耐热树脂层、铝箔层和热封层材料的半成品，所述铝箔层为经表面处理工艺处理制成的铝箔；在层与层之间涂覆胶粘剂通过复合主压合、烘烤、静置制为铝塑膜，包括如下步骤：(1)将主压合温度设置成60℃；(2)将复合好的半成品入40～50℃烘箱中烘烤，(3)出烘箱后静置1-3天，得到铝塑膜成品；使生产的铝塑膜具高质量的低摩擦系数的质量技术要求，减少了恒温恒湿分层概率的发生，提高了锂电池使用的安全性。解决了在铝塑膜冲壳时冲深不够，冲壳易破损，恒温恒湿分层的问题。延长了软包锂电池使用寿命。
Description
本发明涉及锂电池封装用铝塑膜的技术领域，涉及降低锂电池封装用铝塑膜表面摩擦力方法及利用该方法制备而成的锂电池封装用铝塑膜，特别是涉及一种降低铝塑膜表面摩擦力的方法及其方法制备的铝塑膜。
近年来，由于新能源汽车的迅猛发展，使得软包锂电池的应用量急剧增长。随着动力汽车的快速发展，软包电池占比不断增加，软包锂电池相比于其他电池有着能量密度大，安全性能好，重量轻，内阻小，设计灵活等优点，使其各方面的应用研究均成为研究热点。作为软包锂电池关键材料之一的包装材料，铝塑膜是软包装锂电池电芯封装的关键材料，铝塑膜是由外层保护层(ON或PET等)、中间铝箔层(AL层)、内层热封层(CPP或PP)构成的复合材料，层与层之间通过胶黏剂进行压合粘结。单片电池组装后用铝塑膜密封形成电池，铝塑膜起到保护内容物的作用。为满足锂电池的需求，各层对材料和技术都有很高的要求。
中国专利公告号为CN106040562A，公开的《一种改善铝塑膜表面摩擦系数的方法及其设备》，其具体的包括以下步骤：1)配制乳液：将有机聚硅氧烷和有机烷氧基硅烷按一定比例混合形成混合物，将混合物分散乳化在水溶液中，制成一次乳液；2)涂覆：将步骤1)中制得的乳液倒入涂料槽中，使铝塑膜通过导料辊，使乳液涂布于铝塑膜表面；3)刮平：在涂料槽的出口处设有两个柔性刮料条，两个柔性刮料条之间形成铝塑膜可通过的通道，使经过步骤2)的铝塑膜自通道通过，通过柔性刮料条刮平铝塑膜表面的乳液。本发明还提供一种铝塑膜涂膜装置，包括放卷机构、收卷机构、导料辊、涂料槽和柔性刮料条。其可有效降低铝塑膜表面的摩擦系数，提高锂电池的生产质量。但是其还是存不足，如需要对现有的生产设备进行改造，同时在工艺技术参数与原料处理上还是存在一定的复杂性等相应的缺陷，这相应的提高了锂电池封装用铝塑膜的生产成本。
另一方面，在现有的铝塑膜的制备过程中，由于对铝塑膜材料的制备工艺技术参数的设计与控制不当，如对制备铝塑膜的材料的各层之间压合温度的控制，及烘烤温度的控制也同样存在不当如烘烤温度过高及对制备铝塑膜的材料表面处理，对粘合剂的喷涂覆方式等均存在一定的缺陷，使得铝塑膜表面的摩擦系数高，从而使铝塑膜冲坑深度达不到生产的要求，进而影响了锂电池的生产及其生产的质量。因当前工艺技术制备上存在的不足，其制备出的产品难以达到高质量的标准要求，因此，目前市场上铝塑膜大部分依赖进口，如何来提高铝塑膜产品制备的工艺技术水平，从而使国产铝塑膜达到进口或者超过进口水平，进而生产出更先进的、高质量的低摩擦系数的锂电池包装材料用的铝塑膜产品。
发明内容：
本发明公开一种降低铝塑膜表面摩擦力的方法，所述铝塑膜包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，将构成铝塑膜的耐热树脂层、铝箔层和热封层材料的半成品，所述铝箔层为经表面处理工艺处理制成的铝箔；在层与层 之间涂覆胶粘剂通过复合主压合、烘烤、静置制为铝塑膜，使生产的铝塑膜具高质量的低摩擦系数的质量技术要求，减少了恒温恒湿分层概率的发生，提高了锂电池使用的安全性。
本发明一种降低铝塑膜表面摩擦力的方法，所述铝塑膜包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，将构成铝塑膜的耐热树脂层、铝箔层和热封层材料的半成品，所述铝箔层为经表面处理工艺处理制成的铝箔；在层与层之间涂覆胶粘剂通过复合主压合、烘烤、静置制为铝塑膜，其各工艺技术参数步骤控制如下：
(1)将半成品涂胶后进行复合主压合处理，控制复合主压合处理时的温度为55-65℃，制得复合半成品；
(2)将步骤(1)复合半成品置于烘烤装置中进行烘烤处理，控制烘烤处理时的烘烤温度为40-50℃，得铝塑膜半成品；
(3)将步骤(2)制备的铝塑膜半成品，移出烘烤装置后，于常温条件下静置1-3天，得到铝塑膜成品。
优选的，是控制复合压合处理时的主压合辊辊温度为60-62℃。
所述的一种降低铝塑膜表面摩擦力的方法，其步骤(2)控制烘烤处理时间为7-15天。
所述的一种降低铝塑膜表面摩擦力的方法，优选的，是控制复合主压合处理时的主压合压力为0.15-0.25mpa。
本发明所述的一种降低铝塑膜表面摩擦力的方法，其所述铝箔层为经表面处理工艺处理制成的铝箔，包括如下步骤：
1)是对铝箔表面进行酸化处理，控制酸化处理时间为15-30分钟，为酸化铝箔；控制所述酸化处理的溶液为如下质量比组分组成混合制备而成的混合溶液：磷酸溶液30-65％，盐酸溶液5-20％，硫酸溶液15-35％，乙二酸10-15％；
2)将步骤1)的酸化铝箔置于过氧化氢溶液中，进行过氧化处理，控制过氧化处理时间3-5分钟，为过氧化铝箔；
3)将上步的过氧化铝箔在温度为25-40℃风干干燥处理，10-15分钟，即为经表面处理工艺处理后制备而成的铝箔。
一种利用上面所述的降低铝塑膜表面摩擦力的方法制备的具有低表面摩擦力的铝塑膜，包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，其特征是所述耐热树脂层为PA材料，控制所述耐热树脂的层厚度为10-30μm；
所述铝箔层为一种经表面处理工艺处理后制备而成的铝箔，控制铝箔的厚度为30um-50um；
所述热封层为流延聚丙烯或流延聚乙烯，控制所述热封层厚度为30μm-90μm；
所述耐热树脂层与铝箔层通过胶粘剂层固定连接，所述铝箔层与热封层通过粘合树脂层固定连接。
所述的铝塑膜，其所述胶粘剂层为聚氨酯胶粘剂，控制经烘烤后胶粘剂层厚度为2μm-5μm。
所述的铝塑膜，其所述粘合树脂层为改性聚烯烃胶粘剂，控制烘烤后粘合剂层厚度为3μm～7μm。
优选的，是所述的铝塑膜，其特征是所述胶粘剂层厚度为3-4μm。
本发明提供的一种降低锂电池封装用铝塑膜表面摩擦力的方法及其制备的铝塑膜产品，具有如下技术优点：主要体现在其是在对现有的半成品涂胶后经低温的压合温度进行压合，同时在烘烤时使用低温40-50℃烘箱烘烤，减少了生产能耗，降低了生产成本；
二是利用本发明的方法制备提供的锂电池封装用铝塑膜成品，通过降低温度及增加常温静置的方式，使材料中的芥酸酰胺在低温下从膜的内面迁移出到膜表面的凹坑中，降低了铝塑膜表面的摩擦力；
三是本发明方法制备提供的铝塑膜，降低膜表面的摩擦力，增加了铝塑膜冲深成型性，减少了恒温恒湿分层概率的发生，提高了锂电池使用的安全性；可用于产业化大规模生产。
四是本发明方法解决了在锂电池封装用铝塑膜冲壳时冲深不够，冲壳易破损，恒温恒湿分层的问题；延长了软包锂电池使用寿命。
本发明公开一种降低铝塑膜表面摩擦力的方法，所述铝塑膜包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，将构成铝塑膜的耐热树脂层、铝箔层和热封层材料的半成品，所述铝箔层为经表面处理工艺处理制成的铝箔；在层与层之间涂覆胶粘剂通过复合主压合、烘烤、静置制为铝塑膜，其特征是各工艺技术参数步骤控制如下：
(1)将半成品涂胶后进行复合主压合处理，控制复合主压合处理时的温度为55-65℃，优选是控制复合压合处理时的主压合辊辊温度为60-62℃，并控制复合压合处理时的压合压力为0.15-0.25mpa；制得复合半成品；
(2)将步骤(1)复合半成品置于烘烤装置中进行烘烤处理，控制烘烤处理时的烘烤温度为40-50℃，在此温度下，控制烘烤处理时间7-15天，得铝塑膜半成品；
(3)将步骤(2)制备的铝塑膜半成品，移出烘烤装置后，于常温条件下静置1-3天，得到铝塑膜成品。
同时优选的是，对铝箔层进行表面的处理，所述铝箔层为经表面处理工艺处理制成的铝箔，包括如下步骤：
1)是对铝箔表面进行酸化处理，控制酸化处理时间为15-30分钟，为酸化铝箔；控制所述酸化处理的溶液为如下质量比组分组成混合制备而成的混合溶液：磷酸溶液30-65％，盐酸溶液5-20％，硫酸溶液15-35％，乙二酸10-15％；
2)将步骤1)的酸化铝箔置于过氧化氢溶液中，进行过氧化处理，控制过氧化处理时间3-5分钟，为过氧化铝箔；
3)将上步的过氧化铝箔在温度为25-40℃风干干燥处理，10-15分钟，即为经表面处理工艺处理后制备而成的铝箔。
本发明公开的一种利用上面所述的降低铝塑膜表面摩擦力的方法制备的具有低表面摩擦力的铝塑膜，包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，其特征是所述耐热树脂层为PA材料，控制所述耐热树脂的层厚度为10-30μm；
所述铝箔层为一种经表面处理工艺处理后制备而成的铝箔，控制铝箔的厚度为30um-50um；
所述热封层为流延聚丙烯或流延聚乙烯，控制所述热封层厚度为30μm-90μm；
所述耐热树脂层与铝箔层通过胶粘剂层固定连接，所述铝箔层与热封层通过粘合树脂层固定连接；
所述胶粘剂层为聚氨酯胶粘剂，控制经烘烤后胶粘剂层厚度为2μm-5μm。
所述粘合树脂层为改性聚烯烃胶粘剂，控制烘烤后粘合剂层厚度为3μm～7μm。
优选的是控制所述胶粘剂层厚度为3-4μm。
实施例1
本实施方法制备锂电池封装用铝塑膜，铝塑膜包括外层的耐热树脂层、中间的铝箔层和内层的热封层，所述耐热树脂层为PA材料，厚度为10-30μm，所述铝箔层由一种表面处理工艺制备而成的铝箔，即所述的表面处理工艺处理制成的铝箔，包括如下步骤：
1)是对铝箔表面进行酸化处理，控制酸化处理时间为15-30分钟，为酸化铝箔；控制所述酸化处理的溶液为如下质量比组分组成混合制备而成的混合溶液：磷酸溶液30-65％，盐酸溶液5-20％，硫酸溶液15-35％，乙二酸10-15％；
2)将步骤1)的酸化铝箔置于过氧化氢溶液中，进行过氧化处理，控制过氧化处理时间3-5分钟，为过氧化铝箔；
3)将上步的过氧化铝箔在温度为25-40℃风干干燥处理，10-15分钟，即为经表面处理工艺处理后制备而成的铝箔，厚度为30um-50um；
所述热封层为流延聚丙烯或流延聚乙烯，厚度为30μm-90μm，所述耐热树脂层与铝箔层通过胶粘剂层固定连接，所述铝箔层与热封层通过粘合树脂层固定连接，所述胶粘剂层为聚氨酯胶粘剂，烘烤后胶粘剂层厚度为2μm-5μm。所述粘合树脂层为改性聚烯烃胶粘剂，烘烤后胶粘剂层厚度为3μm-7μm。将现制备而成的锂电池封装用铝塑膜的半成品涂胶后经过60℃的主压合复合后，收卷放入40-50℃烘箱烘烤7-15天，出烘箱静置1-3天得到铝塑膜成品。测试表面摩擦力；下面实施例未说明之处均与实施例1相同。
实施例2：
将现有的半成品涂胶后经过60℃的主压合复合后，收卷放入70-90℃烘箱烘烤7-15天，出烘箱静置1-3天得到铝塑膜成品。测试表面摩擦力。
实施例3：
将现有的半成品涂胶后经过60℃的主压合复合后，收卷放入45-50℃烘箱烘烤7-15天，出烘箱静置12小时；测试表面摩擦力。
性能测试：
使用摩擦力测试仪：将本发明方法制备成品铝塑膜分别切成切成17*17mm正方形和25*50mm样条，用摩擦力测试仪进行摩擦力测试(PP面对PP面摩擦，PA面对PA面摩擦)，记录摩擦力数据，然后进行冲壳测试和恒温恒湿测试，同样记录数据。
对比例1：
为国内外现有的具有低锂电池封装用铝塑膜表面摩擦力的产品样品，结构为：PA薄膜25μm/第一胶粘剂层4μm/带钝化层的铝箔层40μm/第二胶粘剂层4μm/流延聚丙烯40μm。
表1.实施例与对比例1的各性能检测结果。
| 检测性能 | PA面摩擦力 | PP面摩擦力 | 冲壳(7mm) | 恒温恒湿分层 |
| 实施例1 | 0.201 | 0.103 | 0NG/50pcs | 0NG/50pcs |
| 实施例2 | 0.563 | 0.265 | 8NG/50pcs | 3NG/50pcs |
| 实施例3 | 0.502 | 0.23 | 9NG/50pcs | 4NG/50pcs |
| 对比例1 | 0.216 | 0.099 | 0NG/50pcs | 0NG/50pcs |
说明：从本发明的实施例1、实施例2、实施例3与对比例1相比较，实施例1与对比例1无差异，说明利用本发明降低铝塑膜表面摩擦力的方法制备的锂电池封装用铝塑膜产品具有较低的表面摩擦力。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本范围由所附权利要求及其等同物限定。均落入本专利保护法范围。
Claims (9)
- 一种降低铝塑膜表面摩擦力的方法，所述铝塑膜包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，构成铝塑膜的耐热树脂层、铝箔层和热封层材料的半成品，所述铝箔层为经表面处理工艺处理制成的铝箔；在层与层之间涂覆胶粘剂通过复合主压合、烘烤、静置制为铝塑膜，其特征是各工艺技术参数步骤控制如下：(1)将半成品涂胶后进行复合主压合处理，控制复合主压合处理时的温度为55-65℃，制得复合半成品；(2)将步骤(1)复合半成品置于烘烤装置中进行烘烤处理，控制烘烤处理时的烘烤温度为40-50℃，得铝塑膜半成品；(3)将步骤(2)制备的铝塑膜半成品，移出烘烤装置后，于常温条件下静置1-3天，得到铝塑膜成品。
- 根据权利要求1所述的一种降低铝塑膜表面摩擦力的方法，其特征是控制复合压合处理时的主压合辊辊温度为60-62℃。
- 根据权利要求1所述的一种降低铝塑膜表面摩擦力的方法，其特征是步骤(2)控制烘烤处理时间为7-15天。
- 根据权利要求1所述的一种降低铝塑膜表面摩擦力的方法，其特征是控制复合压合处理时的压合压力为0.15-0.25mpa。
- 根据权利要求1所述的一种降低铝塑膜表面摩擦力的方法，其特征是所述铝箔层为经表面处理工艺处理制成的铝箔，包括如下步骤：1)是对铝箔表面进行酸化处理，控制酸化处理时间为15-30分钟，为酸化铝箔；控制所述酸化处理的溶液为如下质量比组分组成混合制备而成的混合溶液：磷酸溶液30-65％，盐酸溶液5-20％，硫酸溶液15-35％，乙二酸10-15％；2)将步骤1)的酸化铝箔置于过氧化氢溶液中，进行过氧化处理，控制过氧化处理时间3-5分钟，为过氧化铝箔；3)将上步的过氧化铝箔在温度为25-40℃风干干燥处理，10-15分钟，即为经表面处理工艺处理后制备而成的铝箔。
- 一种利用权利要求1所述的降低铝塑膜表面摩擦力的方法制备的具有低表面摩擦力的铝塑膜，包括外、中、内三层构成，所述外层为耐热树脂层、中间为铝箔层而内层为热封层，其特征是所述耐热树脂层为PA材料，控制所述耐热树脂的层厚度为10-30μm；所述铝箔层为一种经表面处理工艺处理后制备而成的铝箔，控制铝箔的厚度为30um-50um；所述热封层为流延聚丙烯或流延聚乙烯，控制所述热封层厚度为30μm-90μm；所述耐热树脂层与铝箔层通过胶粘剂层固定连接，所述铝箔层与热封层通过粘合树脂层固定连接。
- 根据权利要求5所述的铝塑膜，其特征是所述胶粘剂层为聚氨酯胶粘剂，控制经烘烤后胶粘剂层厚度为2μm-5μm。
- 根据权利要求5所述的铝塑膜，其特征是所述粘合树脂层为改性聚烯烃胶粘剂，控制烘烤后粘合剂层厚度为3μm～7μm。
- 根据权利要求7所述的铝塑膜，其特征是所述胶粘剂层厚度为3-4μm。
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| CN114192377A (zh) * | 2021-12-14 | 2022-03-18 | 江西明冠锂膜技术有限公司 | 一种增加锂电池封装用铝塑膜冲壳深度的方法 |
| CN114425896B (zh) * | 2022-01-26 | 2024-04-02 | 江苏普若维生物技术有限责任公司 | 一种铝塑封口膜及其制备方法 |
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