CN110752323A - Composite film for packaging lithium ion battery and preparation method thereof - Google Patents
Composite film for packaging lithium ion battery and preparation method thereof Download PDFInfo
- Publication number
- CN110752323A CN110752323A CN201910947584.6A CN201910947584A CN110752323A CN 110752323 A CN110752323 A CN 110752323A CN 201910947584 A CN201910947584 A CN 201910947584A CN 110752323 A CN110752323 A CN 110752323A
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- China
- Prior art keywords
- layer
- lithium ion
- substrate layer
- ion battery
- packaging
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Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 claims description 59
- 239000000758 substrate Substances 0.000 claims description 40
- 238000007731 hot pressing Methods 0.000 claims description 21
- 239000011241 protective layer Substances 0.000 claims description 20
- 239000012793 heat-sealing layer Substances 0.000 claims description 19
- 239000000853 adhesive Substances 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 16
- 238000013329 compounding Methods 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 239000002985 plastic film Substances 0.000 claims description 9
- 229920006255 plastic film Polymers 0.000 claims description 9
- 239000004677 Nylon Substances 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 7
- 239000011888 foil Substances 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
Landscapes
- 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)
- Laminated Bodies (AREA)
Abstract
The invention discloses a composite film for packaging a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. The invention adopts the Al-Fe-Al thin sheet to replace the traditional aluminum foil, improves the overall strength, effectively prevents the flexible package from bulging and cracking, and prolongs the service life of the lithium ion battery.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and relates to a composite film for packaging a lithium ion battery and a preparation method thereof.
Background
The lithium ion battery with the flexible package has the advantages of large capacity, light weight, high safety and the like, and is more and more emphasized and applied at present, an aluminum plastic film is mostly adopted as the flexible package in the prior art, the flexible package aluminum plastic film is generally formed by compounding three layers of films with different functions, a nylon PA layer is used as a protective layer on the outer layer to ensure that the aluminum plastic film cannot deform, an aluminum foil is used as an insulating layer in the middle to prevent water from permeating, and a CPP layer is used as a heat sealing layer on the inner layer for heat sealing of the lithium ion battery.
The soft-packing lithium cell can take place pressure increase and lead to the problem such as bulge in the use, because aluminium foil material density is little, the melting point is low, intensity is low, when the bulge expands to a certain extent, can arouse breaking of soft-packing, causes dangerous emergence such as oozing or short circuit of lithium cell electrolyte, reduces lithium ion battery's life, has influenced lithium ion battery's stability and use universality.
Disclosure of Invention
The invention aims to overcome the defects of the technology and provide the composite film for packaging the lithium ion battery, which has high strength, good stability and low cost, and the preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: the composite film for packaging the lithium ion battery comprises a protective layer, a basal layer and a heat sealing layer which are sequentially arranged from top to bottom, and is characterized in that the protective layer is a plastic film made of one or a combination of nylon PA and PET, the basal layer is an Al-Fe-Al sheet, and the heat sealing layer is a CPP plastic film.
Further, the protective layer and the substrate layer are bonded and compounded through an adhesive, and the substrate layer and the heat sealing layer are compounded through hot pressing.
Further, the thickness of the protective layer is 0.03-0.15 mm; the thickness of the substrate layer is 0.03-0.15 mm; the thickness of the heat sealing layer is 0.03-0.15 mm.
Furthermore, the thickness ratio of Al, Fe and Al in the substrate layer is 1 (3-8): 1.
Further, the purity of the Fe in the base layer is > 99%.
A preparation method of a composite membrane for packaging a lithium ion battery sequentially comprises the following steps:
s1: and annealing the substrate layer, wherein the annealing temperature is 500-600 ℃, and the annealing heat preservation time is 2-5 min.
S2: and cooling the substrate layer treated in the step S1 to room temperature, and then carrying out acid pickling passivation treatment on the surface of the substrate layer.
S3: bonding and compounding one surface of the substrate layer treated in the step S2 with a protective layer through an adhesive, laying a heat sealing layer on the other surface of the substrate layer after the adhesive is completely dried, placing the substrate layer on a hot press for hot-press compounding, and maintaining the pressure and cooling to room temperature; or, firstly, laying a heat-sealing layer on one surface of the substrate layer, placing the substrate layer on a hot press for hot-pressing compounding, maintaining the pressure and cooling to room temperature, then bonding and compounding the other surface of the substrate layer with the protective layer through an adhesive, and completely drying the adhesive; during the hot pressing process, the hot pressing temperature is 140-180 ℃, and the hot pressing pressure is 1 t.
Further, the annealing temperature in the step S1 is 550 ℃.
Further, the hot pressing process in step S3 is performed under a vacuum environment or under an inert gas protection.
The invention has the beneficial effects that: the Al-Fe-Al thin sheet is adopted to replace the traditional aluminum foil, the annealing process is adopted to reduce the hardness of Fe and improve the plasticity and toughness of Fe, the high plasticity and toughness of the traditional aluminum foil are reserved, the strength is improved, the bulging and cracking of the flexible package can be effectively prevented, and the service life of the lithium ion battery is prolonged; compared with the traditional hot roller extrusion process, the manufacturing time is shortened through the hot pressing process, the interface bonding strength can be improved, the substrate layer and the heat sealing layer are not required to be adhered through an adhesive in advance, the hot pressing forming can be directly carried out, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of a composite membrane of the present invention.
In the figure: protective layer 1, basal layer 2, heat-seal layer 3.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Example 1
Referring to fig. 1, a composite film for packaging a lithium ion battery includes a protective layer 1, a substrate layer 2 and a heat sealing layer 3, which are sequentially disposed from top to bottom, wherein the protective layer 1 is a plastic film made of one or a combination of nylon PA and PET, the substrate layer 2 is an Al-Fe-Al sheet, and the heat sealing layer 3 is a CPP plastic film; the protective layer 1 and the substrate layer 2 are bonded and compounded through an adhesive, and the substrate layer 2 and the heat sealing layer 3 are compounded through hot pressing; the thickness of the protective layer 1 is 0.03-0.15 mm; the thickness of the substrate layer 2 is 0.03-0.15 mm; the thickness of the heat sealing layer 3 is 0.03-0.15 mm; the thickness ratio of Al, Fe and Al in the substrate layer 2 is 1 (3-8) to 1; the purity of Fe in the base layer 2 is > 99%.
Example 2
Referring to fig. 1, the following steps are sequentially adopted when preparing the composite film for packaging the lithium ion battery:
s1: and annealing the substrate layer 2 at the annealing temperature of 500-600 ℃ for 2-5 min.
S2: cooling the substrate layer 2 treated in the step S1 to room temperature, and then performing acid cleaning passivation on the surface of the substrate layer.
S3: bonding and compounding one surface of the substrate layer 2 treated in the step S2 with the protective layer 1 through an adhesive, laying a heat sealing layer 3 on the other surface of the substrate layer after the adhesive is completely dried, placing the substrate layer on a hot press for hot-pressing compounding, and maintaining the pressure and cooling to room temperature; or, firstly, laying a heat-sealing layer 3 on one surface of the substrate layer 2, placing the substrate layer on a hot press for hot-pressing compounding, maintaining the pressure and cooling the substrate layer to room temperature, then bonding and compounding the other surface of the substrate layer with the protective layer 1 through an adhesive, and completely drying the adhesive; during the hot pressing process, the hot pressing temperature is 140-180 ℃, and the hot pressing pressure is 1 t.
Wherein, the annealing temperature in the step S1 is preferably 550 ℃; the hot pressing process in step S3 is preferably performed under a vacuum environment or under an inert gas atmosphere.
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (8)
1. The composite film for packaging the lithium ion battery comprises a protective layer, a basal layer and a heat sealing layer which are sequentially arranged from top to bottom, and is characterized in that the protective layer is a plastic film made of one or a combination of nylon PA and PET, the basal layer is an Al-Fe-Al sheet, and the heat sealing layer is a CPP plastic film.
2. The composite film for packaging a lithium ion battery according to claim 1, wherein the protective layer and the base layer are bonded and compounded by an adhesive, and the base layer and the heat seal layer are compounded by hot pressing.
3. The composite film for packaging a lithium ion battery according to claim 1, wherein the thickness of the protective layer is 0.03-0.15 mm; the thickness of the substrate layer is 0.03-0.15 mm; the thickness of the heat sealing layer is 0.03-0.15 mm.
4. The composite film for packaging the lithium ion battery as claimed in claim 1, wherein the thickness ratio of Al, Fe and Al in the base layer is 1 (3-8): 1.
5. The composite film for packaging lithium ion batteries according to claim 1, wherein the purity of Fe in the base layer is > 99%.
6. A preparation method of the composite membrane for packaging the lithium ion battery as claimed in claim 1, which comprises the following steps in sequence:
s1: annealing the substrate layer, wherein the annealing temperature is 500-600 ℃, and the annealing heat preservation time is 2-5 min;
s2: cooling the substrate layer treated in the step S1 to room temperature, and then carrying out acid pickling passivation treatment on the surface of the substrate layer;
s3: bonding and compounding one surface of the substrate layer treated in the step S2 with a protective layer through an adhesive, laying a heat sealing layer on the other surface of the substrate layer after the adhesive is completely dried, placing the substrate layer on a hot press for hot-press compounding, and maintaining the pressure and cooling to room temperature; or, firstly, laying a heat-sealing layer on one surface of the substrate layer, placing the substrate layer on a hot press for hot-pressing compounding, maintaining the pressure and cooling to room temperature, then bonding and compounding the other surface of the substrate layer with the protective layer through an adhesive, and completely drying the adhesive; during the hot pressing process, the hot pressing temperature is 140-180 ℃, and the hot pressing pressure is 1 t.
7. The method for preparing the composite film for packaging the lithium ion battery according to claim 6, wherein the annealing temperature in the step S1 is 550 ℃.
8. The method according to claim 6, wherein the hot pressing process in step S3 is performed under vacuum environment or inert gas protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947584.6A CN110752323A (en) | 2019-10-08 | 2019-10-08 | Composite film for packaging lithium ion battery and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910947584.6A CN110752323A (en) | 2019-10-08 | 2019-10-08 | Composite film for packaging lithium ion battery and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110752323A true CN110752323A (en) | 2020-02-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910947584.6A Pending CN110752323A (en) | 2019-10-08 | 2019-10-08 | Composite film for packaging lithium ion battery and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110752323A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101992570A (en) * | 2010-08-26 | 2011-03-30 | 昆山永翔光电科技有限公司 | Aluminum-plastic membrane used for packaging lithium battery |
| CN204342861U (en) * | 2014-12-26 | 2015-05-20 | 山东众冠钢板有限公司 | A kind of aluminum-zinc alloy silicon steel sheet |
| CN204401889U (en) * | 2014-12-31 | 2015-06-17 | 杨天根 | A kind of thermal insulation tile |
| US20150325819A1 (en) * | 2014-05-08 | 2015-11-12 | Showa Denko Packaging Co., Ltd. | Electrochemical device |
| CN205028932U (en) * | 2015-10-10 | 2016-02-10 | 东莞市卓越新材料科技有限公司 | Membrane is moulded to crude steel of punctiform and lithium ion battery who makes thereof |
| CN106129273A (en) * | 2016-06-30 | 2016-11-16 | 谢振华 | The Package casing of a kind of lithium battery and the processing method of this Package casing |
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| US20170110694A1 (en) * | 2015-10-19 | 2017-04-20 | Amperex Technology Limited | Lithium-ion battery flexible packaging material and lithium-ion battery using the same |
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| US20200168857A1 (en) * | 2017-07-19 | 2020-05-28 | Dai Nippon Printing Co., Ltd. | Battery packaging material, method for producing the same, and battery |
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-
2019
- 2019-10-08 CN CN201910947584.6A patent/CN110752323A/en active Pending
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