CN115534463A - Inner and outer layer composite film of tinplate - Google Patents
Inner and outer layer composite film of tinplate Download PDFInfo
- Publication number
- CN115534463A CN115534463A CN202211233353.7A CN202211233353A CN115534463A CN 115534463 A CN115534463 A CN 115534463A CN 202211233353 A CN202211233353 A CN 202211233353A CN 115534463 A CN115534463 A CN 115534463A
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- CN
- China
- Prior art keywords
- layer
- heat
- seal
- tinplate
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000005028 tinplate Substances 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 17
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 101
- 239000012790 adhesive layer Substances 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052744 lithium Inorganic materials 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 7
- 230000005855 radiation Effects 0.000 abstract description 6
- 238000003854 Surface Print Methods 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Images
Classifications
-
- 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
- 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
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
-
- 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
- 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
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
- H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only organic 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
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- 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
- B32B2457/00—Electrical equipment
- B32B2457/10—Batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Packages (AREA)
Abstract
The invention provides an inner and outer layer composite film of a tinplate, a substrate is made of a tinplate material, a film layer convenient to print is arranged on the outer surface of the substrate, a protective film layer comprises a first bonding layer and a first heat-seal PP layer, the inner surface of the substrate is bonded with the first heat-seal PP layer through the first bonding layer, the film layer convenient to print comprises a second bonding layer and a second heat-seal PP layer, the outer surface of the substrate is bonded with the second heat-seal PP layer through the second bonding layer, when the heat conduction and the heat radiation generated by a battery packaged in a tinplate box exceed 100 ℃, the heat-seal PP layer can be opened to release gas and heat in the lithium battery, a safety air valve is not needed to be installed, the cost is saved, the explosion caused by overhigh temperature in the tinplate box is prevented, meanwhile, the effect of isolating harmful substances on the surface of the tinplate from entering the lithium battery is achieved, and the surface of the second heat-seal PP layer is rough, so that the effect of surface printing is facilitated.
Description
Technical Field
The invention relates to the field of external packaging of lithium batteries, in particular to an internal and external layer composite film of tinplate and a preparation method thereof.
Background
In the field of external packaging of lithium batteries, the tinplate has the advantages of good mechanical property, excellent barrier property, mature manufacturing process, high production efficiency, delicate decoration, recyclability and the like, so that the tinplate is one of common packaging forms of food and food in the current market and is popular with the packaging industry and wide consumers. However, when a battery is placed at a high temperature or a certain battery in a battery pack is out of control due to heat, the battery often has a rapid temperature rise, and heat conduction and heat radiation generated by the battery in an out-of-control state can ignite other batteries in the battery pack, which causes thermal diffusion to cause safety accidents.
Simultaneously, outside harmful substance can permeate lithium cell department through tinplate, can make the lithium cell corrode, influences the performance of lithium cell, need print at the tinplate simultaneously and make whole tinplate box pleasing to the eye, but directly prints on the tinplate surface, because the tinplate is more smooth, the degree of difficulty is great.
Disclosure of Invention
The invention provides an inner and outer layer composite film of a tinplate, aiming at solving the problems of timely releasing gas and heat inside a lithium battery and preventing harmful substances from permeating the lithium battery through the tinplate to influence the performance of the lithium battery and facilitating printing, the invention provides the inner and outer layer composite film of the tinplate, a substrate 1 is made of a tinplate material, a film layer 5 facilitating printing is arranged on the outer surface of the substrate 1, a protective film layer 2 comprises a first bonding layer 3 and a first heat-seal PP layer 4, the inner surface of the substrate 1 is bonded with the first heat-seal PP layer 4 through the first bonding layer 3, the film layer 5 facilitating printing comprises a second bonding layer 6 and a second heat-seal PP layer 7, the outer surface of the substrate 1 is bonded with the second heat-seal PP layer 7 through the second bonding layer 6, when heat conduction and heat radiation generated by a battery packaged in a tinplate box exceed 100 ℃, the heat-seal PP layer 4 can be opened to release the gas and heat inside the lithium battery, a safety air valve is not needed to be installed, the cost is saved, meanwhile, the effect of preventing the harmful substances from entering the lithium battery on the surface of the tinplate is achieved, and the surface of the second heat-seal PP layer 7 is rough and the effect of facilitating printing is achieved.
The utility model provides an interior outer layer complex film of tinplate, includes base plate 1, and base plate 1 is the tinplate material, its characterized in that: the internal surface of base plate 1 is provided with protection rete 2, and the surface of base plate 1 is provided with the printing rete 5 of being convenient for, and protection rete 2 includes first bond line 3 and first heat-seal PP layer 4, and the internal surface of base plate 1 passes through first bond line 3 and bonds with first heat-seal PP layer 4, and the printing rete 5 of being convenient for includes second bond line 6 and second heat-seal PP layer 7, and the surface of base plate 1 passes through second bond line 6 and the bonding of second heat-seal PP layer 7.
Further, the material of the first adhesive layer 3 and the second adhesive layer 6 is MPP resin.
Further, the material of the first heat-seal PP layer 4 and the second heat-seal PP layer 7 is APP resin.
Further, the thickness of the substrate 1 is 0.05 to 0.15mm, preferably 0.15mm.
Further, the thickness of each of the first adhesive layer 3 and the second adhesive layer 6 is 0.02 to 0.03mm, preferably 0.03mm.
Further, the thickness of the first heat-seal PP layer 4 and the second heat-seal PP layer 7 is 0.04-0.05mm, preferably 0.05mm.
The invention has the beneficial effects that: the invention provides an inner and outer layer composite film of tinplate, a substrate 1 is made of a tinplate material, a film layer 5 convenient to print is arranged on the outer surface of the substrate 1, a protective film layer 2 comprises a first bonding layer 3 and a first heat-seal PP layer 4, the inner surface of the substrate 1 is bonded with the first heat-seal PP layer 4 through the first bonding layer 3, the film layer 5 convenient to print comprises a second bonding layer 6 and a second heat-seal PP layer 7, the outer surface of the substrate 1 is bonded with the second heat-seal PP layer 7 through the second bonding layer 6, when the heat conduction and the heat radiation generated by a battery packaged in a tinplate box exceed 100 ℃, the heat-seal PP layer 4 can be opened to release the gas and the heat in the lithium battery, a safety air valve is not needed to be installed, the cost is saved, the explosion caused by overhigh temperature in the tinplate box is prevented, meanwhile, the effect of isolating harmful substances on the surface of the tinplate from entering the lithium battery is achieved, and the surface of the second heat-seal PP layer 7 is rough in surface, and the effect of facilitating surface printing is achieved.
Drawings
Fig. 1 is a schematic structural view of an aluminum-plastic composite film according to an embodiment.
Description of main components:
the following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The specific implementation case is as follows:
example 1:
the utility model provides an interior outer layer complex film of tinplate, includes base plate 1, and base plate 1 is the tinplate material, its characterized in that: the internal surface of base plate 1 is provided with protection rete 2, the surface of base plate 1 is provided with the printing rete 5 of being convenient for, protection rete 2 includes first bond line 3 and first heat-seal PP layer 4, the internal surface of base plate 1 is passed through first bond line 3 and is bonded with first heat-seal PP layer 4, printing rete 5 of being convenient for includes second bond line 6 and second heat-seal PP layer 7, the surface of base plate 1 passes through second bond line 6 and bonds with second heat-seal PP layer 7, the material of first bond line 3 and second bond line 6 is the MPP resin, the material of first heat-seal PP layer 4 and second heat-seal PP layer 7 is the APP resin, the thickness of base plate 1 is 0.15mm, the thickness of first bond line 3 and second bond line 6 is 0.03mm, the thickness of first heat-seal PP layer 4 and second heat-seal PP layer 7 is 0.05mm.
The invention has the beneficial effects that: the invention provides an inner and outer layer composite film of tinplate, a substrate 1 is made of a tinplate material, a film layer 5 convenient to print is arranged on the outer surface of the substrate 1, a protective film layer 2 comprises a first bonding layer 3 and a first heat-seal PP layer 4, the inner surface of the substrate 1 is bonded with the first heat-seal PP layer 4 through the first bonding layer 3, the film layer 5 convenient to print comprises a second bonding layer 6 and a second heat-seal PP layer 7, the outer surface of the substrate 1 is bonded with the second heat-seal PP layer 7 through the second bonding layer 6, when the heat conduction and the heat radiation generated by a battery packaged in a tinplate box exceed 100 ℃, the heat-seal PP layer 4 can be opened to release the gas and the heat in the lithium battery, a safety air valve is not needed to be installed, the cost is saved, the explosion caused by overhigh temperature in the tinplate box is prevented, meanwhile, the effect of isolating harmful substances on the surface of the tinplate from entering the lithium battery is achieved, and the surface of the second heat-seal PP layer 7 is rough in surface, and the effect of facilitating surface printing is achieved.
Example 2
The utility model provides an interior outer layer complex film of tinplate, includes base plate 1, and base plate 1 is the tinplate material, its characterized in that: the internal surface of base plate 1 is provided with protection rete 2, the surface of base plate 1 is provided with the printing rete 5 of being convenient for, protection rete 2 includes first bond line 3 and first heat-seal PP layer 4, the internal surface of base plate 1 is through first bond line 3 and first heat-seal PP layer 4 bonding, printing rete 5 of being convenient for includes second bond line 6 and second heat-seal PP layer 7, the surface of base plate 1 passes through second bond line 6 and second heat-seal PP layer 7 bonding, the material of first bond line 3 and second bond line 6 is the MPP resin, the material of first heat-seal PP layer 4 and second heat-seal PP layer 7 is the APP resin, the thickness of base plate 1 is 0.05mm, the thickness of first bond line 3 and second bond line 6 is 0.02mm, the thickness of first heat-seal PP layer 4 and second heat-seal PP layer 7 is 0.04mm.
The invention has the beneficial effects that: the invention provides an inner and outer layer composite film of a tinplate, a substrate 1 is made of a tinplate material, a film layer 5 convenient to print is arranged on the outer surface of the substrate 1, a protective film layer 2 comprises a first bonding layer 3 and a first heat-seal PP layer 4, the inner surface of the substrate 1 is bonded with the first heat-seal PP layer 4 through the first bonding layer 3, the film layer 5 convenient to print comprises a second bonding layer 6 and a second heat-seal PP layer 7, the outer surface of the substrate 1 is bonded with the second heat-seal PP layer 7 through the second bonding layer 6, when heat conduction and heat radiation generated by a battery packaged in the tinplate box exceed 100 ℃, the heat-seal PP layer 4 can be opened to release gas and heat in the lithium battery, a safety air valve is not needed to be installed, cost is saved, the phenomenon that the temperature in the tinplate box is too high and explosion is prevented, meanwhile, the effect of isolating harmful substances on the surface of the tinplate from entering the lithium battery is achieved, and the surface of the second heat-seal PP layer 7 is rough, and the effect of facilitating surface printing is achieved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. The utility model provides an interior outer layer complex film of tinplate, includes base plate (1), and base plate (1) is the tinplate material, its characterized in that: the internal surface of base plate (1) is provided with protective film layer (2), the surface of base plate (1) is provided with printing rete (5) of being convenient for, protective film layer (2) are including first bond line (3) and first heat-seal PP layer (4), the internal surface of base plate (1) is through first bond line (3) and first heat-seal PP layer (4) bonding, be convenient for print rete (5) and include second bond line (6) and second heat-seal PP layer (7), the surface of base plate (1) is through second bond line (6) and second heat-seal PP layer (7) bonding.
2. The inner and outer layer composite film of tinplate as claimed in claim 1, wherein: the material of the first adhesive layer (3) and the second adhesive layer (6) is MPP resin.
3. The inner and outer layer composite film of tinplate as claimed in claim 1, wherein: the materials of the first heat-sealing PP layer (4) and the second heat-sealing PP layer (7) are APP resin.
4. The inner and outer layer composite film of tinplate as claimed in claim 1, wherein: the thickness of the substrate (1) is 0.05-0.15mm.
5. The inner and outer layer composite film of tinplate as claimed in claim 1, wherein: the thickness of the first adhesive layer (3) and the second adhesive layer (6) is 0.02-0.03mm.
6. The inner and outer composite film of tinplate as claimed in claim 1, wherein: the thickness of the first heat-seal PP layer (4) and the second heat-seal PP layer (7) is 0.04-0.05mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211233353.7A CN115534463A (en) | 2022-10-10 | 2022-10-10 | Inner and outer layer composite film of tinplate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211233353.7A CN115534463A (en) | 2022-10-10 | 2022-10-10 | Inner and outer layer composite film of tinplate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115534463A true CN115534463A (en) | 2022-12-30 |
Family
ID=84733041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211233353.7A Pending CN115534463A (en) | 2022-10-10 | 2022-10-10 | Inner and outer layer composite film of tinplate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115534463A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993024324A1 (en) * | 1992-06-04 | 1993-12-09 | Basf Lacke + Farben Aktiengesellschaft | Process for producing a metal-plastic film composite material, metal-plastic film composite material produced according to said process and its use for producing packaging containers |
| CN201192910Y (en) * | 2008-03-12 | 2009-02-11 | 上海人民塑料印刷厂 | Metal can packaging material |
| CN101665174A (en) * | 2009-10-21 | 2010-03-10 | 浙江金石包装有限公司 | Hot melt adhesive aluminum foil sealing film and manufacturing method thereof |
| CN102658699A (en) * | 2012-05-25 | 2012-09-12 | 任丘市京开塑业有限公司 | Thin film directly thermally laminated on tinned plate |
| CN103434237A (en) * | 2013-09-06 | 2013-12-11 | 金石包装（嘉兴）有限公司 | Easy-tearing type dry composite sheet and production method thereof |
| CN110589229A (en) * | 2019-09-04 | 2019-12-20 | 湖州金洁实业有限公司 | Temperature-resistant sterilization easy-to-tear cover aluminum foil |
| CN110588120A (en) * | 2019-08-30 | 2019-12-20 | 厦门长塑实业有限公司 | High-barrier nylon composite film resistant to high-temperature cooking and easy to strip and preparation method thereof |
| CN212555388U (en) * | 2020-06-08 | 2021-02-19 | 上海燊顺包装材料有限公司 | Tea bag label paper |
| CN215283818U (en) * | 2021-06-29 | 2021-12-24 | 苏州融达信新材料科技有限公司 | Mute light plastic-aluminum complex film of black |
| CN114074461A (en) * | 2020-08-13 | 2022-02-22 | 苏州融达信新材料科技有限公司 | Novel safe plastic-aluminum membrane |
| CN114300792A (en) * | 2021-12-30 | 2022-04-08 | 江苏睿捷新材料科技有限公司 | Lithium battery composite packaging material |
-
2022
- 2022-10-10 CN CN202211233353.7A patent/CN115534463A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993024324A1 (en) * | 1992-06-04 | 1993-12-09 | Basf Lacke + Farben Aktiengesellschaft | Process for producing a metal-plastic film composite material, metal-plastic film composite material produced according to said process and its use for producing packaging containers |
| CN201192910Y (en) * | 2008-03-12 | 2009-02-11 | 上海人民塑料印刷厂 | Metal can packaging material |
| CN101665174A (en) * | 2009-10-21 | 2010-03-10 | 浙江金石包装有限公司 | Hot melt adhesive aluminum foil sealing film and manufacturing method thereof |
| CN102658699A (en) * | 2012-05-25 | 2012-09-12 | 任丘市京开塑业有限公司 | Thin film directly thermally laminated on tinned plate |
| CN103434237A (en) * | 2013-09-06 | 2013-12-11 | 金石包装（嘉兴）有限公司 | Easy-tearing type dry composite sheet and production method thereof |
| CN110588120A (en) * | 2019-08-30 | 2019-12-20 | 厦门长塑实业有限公司 | High-barrier nylon composite film resistant to high-temperature cooking and easy to strip and preparation method thereof |
| CN110589229A (en) * | 2019-09-04 | 2019-12-20 | 湖州金洁实业有限公司 | Temperature-resistant sterilization easy-to-tear cover aluminum foil |
| CN212555388U (en) * | 2020-06-08 | 2021-02-19 | 上海燊顺包装材料有限公司 | Tea bag label paper |
| CN114074461A (en) * | 2020-08-13 | 2022-02-22 | 苏州融达信新材料科技有限公司 | Novel safe plastic-aluminum membrane |
| CN215283818U (en) * | 2021-06-29 | 2021-12-24 | 苏州融达信新材料科技有限公司 | Mute light plastic-aluminum complex film of black |
| CN114300792A (en) * | 2021-12-30 | 2022-04-08 | 江苏睿捷新材料科技有限公司 | Lithium battery composite packaging material |
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