CN114133890A - Hot melt adhesive and lithium ion battery - Google Patents
Hot melt adhesive and lithium ion battery Download PDFInfo
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- CN114133890A CN114133890A CN202111430631.3A CN202111430631A CN114133890A CN 114133890 A CN114133890 A CN 114133890A CN 202111430631 A CN202111430631 A CN 202111430631A CN 114133890 A CN114133890 A CN 114133890A
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- Prior art keywords
- hot melt
- adhesive layer
- melt adhesive
- equal
- adhesive
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- 239000004831 Hot glue Substances 0.000 title claims abstract description 73
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 239000012790 adhesive layer Substances 0.000 claims abstract description 103
- 239000003292 glue Substances 0.000 claims abstract description 24
- 239000002033 PVDF binder Substances 0.000 claims abstract description 19
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 18
- 239000000758 substrate Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000002390 adhesive tape Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 19
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 7
- 239000002985 plastic film Substances 0.000 description 7
- 229920006255 plastic film Polymers 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 239000003963 antioxidant agent Substances 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 235000010215 titanium dioxide Nutrition 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- VSKJLJHPAFKHBX-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical compound CC(=C)C=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 VSKJLJHPAFKHBX-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 244000248349 Citrus limon Species 0.000 description 1
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229920002367 Polyisobutene Polymers 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- UMUXBDSQTCDPJZ-UHFFFAOYSA-N chromium titanium Chemical compound [Ti].[Cr] UMUXBDSQTCDPJZ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- NNSIWZRTNZEWMS-UHFFFAOYSA-N cobalt titanium Chemical compound [Ti].[Co] NNSIWZRTNZEWMS-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J127/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Adhesives based on derivatives of such polymers
- C09J127/02—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J127/12—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Adhesives based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09J127/16—Homopolymers or copolymers of vinylidene fluoride
-
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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 of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The application provides a hot melt adhesive and lithium ion battery, wherein, the hot melt adhesive is including the first glue film and the second glue film of range upon range of setting, first glue film includes polyvinylidene fluoride. When the hot melt adhesive is used for bonding two objects made of different materials, the bonding requirements of the objects made of the two different materials can be respectively adapted through the arrangement of the first adhesive layer and the second adhesive layer, so that the hot melt adhesive has better bonding performance; and, above-mentioned two kinds of objects of different materials include the diaphragm, utilize the setting of the polyvinylidene fluoride that includes in the first glue film, and the bonding strength between first glue film and the diaphragm can be strengthened to polyvinylidene fluoride composition in the cooperation diaphragm, and this bonding property that enables the hot melt adhesive in the application stage obtains further promotion.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a hot melt adhesive and a lithium ion battery.
Background
With the improvement of the energy density of the lithium ion battery, the safety performance of the lithium ion battery is more and more emphasized, wherein the anti-drop performance is an important index of the safety performance of the lithium ion battery.
The industry is many to pass through hot melt adhesive and fix lithium ion battery's electric core and plastic-aluminum membrane to promote lithium ion battery's anti falling nature, the hot melt adhesive that utilizes correlation technique to produce is relatively poor in the adhesion nature, and this makes current hot melt adhesive can't accomplish the firm bonding of electric core in packaging shell, leads to lithium ion battery's anti falling performance relatively poor.
Disclosure of Invention
An object of the application is to provide a hot melt adhesive and a lithium ion battery for solve the relatively poor problem of adhesion of current hot melt adhesive.
In a first aspect, an embodiment of the present application provides a hot melt adhesive, including:
the adhesive tape comprises a first adhesive layer and a second adhesive layer which are arranged in a stacked mode, wherein the first adhesive layer comprises polyvinylidene fluoride.
Optionally, the hot melt adhesive further comprises a substrate, and the first adhesive layer and the second adhesive layer are respectively disposed on the opposite sides of the substrate.
Optionally, the mass ratio of the polyvinylidene fluoride in the first glue layer is greater than or equal to 0.4 and less than or equal to 0.8.
Optionally, the first glue layer further includes ceramic.
Optionally, the grain size of the ceramic is greater than or equal to 0.1 micrometer and less than or equal to 10 micrometers.
Optionally, the first adhesive layer further includes a tackifying resin.
Optionally, the thickness of the first glue layer is greater than or equal to 5 micrometers and less than or equal to 35 micrometers;
the thickness of the second glue layer is greater than or equal to 5 micrometers and less than or equal to 35 micrometers.
Optionally, the viscosity of the second adhesive layer is greater than 0 and less than or equal to 1kgf per square millimeter.
Optionally, the molecular weight of the first glue layer is greater than or equal to 5 mol/g and less than or equal to 2 × 106Moles per gram; the molecular weight of the second glue layer is more than or equal to 1mol per gram and less than or equal to 106Moles per gram.
In a second aspect, an embodiment of the present application provides a lithium ion battery, which includes a separator, an electrolyte, a package housing, a positive plate, a negative plate, and the hot melt adhesive of the first aspect.
The technical scheme has the following advantages or beneficial effects:
when the hot melt adhesive and the lithium ion battery provided by the embodiment of the application are used for bonding two objects made of different materials, the bonding requirements of the objects made of the two different materials can be respectively adapted through the arrangement of the first adhesive layer and the second adhesive layer, so that the hot melt adhesive has better bonding performance; and, above-mentioned two kinds of objects of different materials include the diaphragm, utilize the setting of the polyvinylidene fluoride that includes in the first glue film, and the bonding strength between first glue film and the diaphragm can be strengthened to polyvinylidene fluoride composition in the cooperation diaphragm, and this bonding property that enables the hot melt adhesive in the application stage obtains further promotion.
Drawings
FIG. 1 is a schematic structural diagram of a hot melt adhesive provided in the embodiments of the present application;
FIG. 2 is a schematic structural diagram of another hot melt adhesive provided in the embodiments of the present application;
fig. 3 is a schematic structural diagram of a soft-package battery cell provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a hot melt adhesive 10 provided in an embodiment of the present application, and as shown in fig. 1, the hot melt adhesive 10 includes:
the adhesive comprises a first adhesive layer 11 and a second adhesive layer 12 which are arranged in a stacked mode, wherein the first adhesive layer 11 comprises polyvinylidene fluoride.
As described above, when the hot melt adhesive 10 is used to bond two objects made of different materials, the first adhesive layer 11 and the second adhesive layer 12 can be arranged to respectively meet the bonding requirements of the two objects made of different materials, so that the hot melt adhesive 10 has good bonding performance; moreover, the two objects made of different materials comprise the diaphragm 20, and the polyvinylidene fluoride contained in the first adhesive layer 11 is utilized, so that the adhesive strength between the first adhesive layer 11 and the diaphragm 20 can be enhanced by matching the polyvinylidene fluoride component in the diaphragm 20, and the adhesive property of the hot melt adhesive 10 in the application stage can be further improved.
For example, the two objects made of different materials may be a membrane 20 and an aluminum-plastic film casing, at this time, the hot melt adhesive 10 is used to complete the edge sealing operation of the soft-package lithium ion battery, that is, after the winding of the soft-package battery core is completed, the soft-package battery core is placed into the corresponding aluminum-plastic film casing, then the hot melt adhesive 10 is placed between the aluminum-plastic film casing and the membrane 20 on the surface of the soft-package battery core, and the hot melt adhesive 10 is converted from a solid state to a molten state through a hot pressing manner, so as to fill a gap between the membrane 20 on the surface of the soft-package battery core and the aluminum-plastic film casing, after the hot melt adhesive 10 is solidified, the firm bonding between the membrane 20 on the surface of the soft-package battery core and the aluminum-plastic film casing is completed, that is, the edge sealing operation is correspondingly completed, at this time, the first adhesive layer 11 is bonded to the membrane 20 on the surface of the soft-package battery core, and the second adhesive layer 12 is bonded to the aluminum-plastic film casing; generally, the diaphragm 20 on the surface of the soft package battery core comprises a polyvinylidene fluoride component, and the polyvinylidene fluoride component included by the first adhesive layer 11 is utilized to enable the first adhesive layer 11 to permeate into the diaphragm 20, so as to further enhance the bonding strength between the first adhesive layer 11 and the diaphragm 20, and enable the inner surface of the soft package battery core and the inner surface of the aluminum-plastic film shell to be firmly connected, so as to achieve the purpose of improving the overall anti-falling performance of the soft package battery.
The second adhesive layer 12 may include at least one of natural rubber, styrene-butadiene rubber, polyisobutylene rubber, butyl rubber, styrene-isoprene-styrene, polyethylene terephthalate, and polyimide, and in practice, a user may adjust the specific composition of the second adhesive layer 12 according to a requirement, which is not limited in the embodiment of the present application.
Moreover, compared with the structure of the conventional hot melt adhesive 10 with a hard base material, the hot melt adhesive 10 provided in the embodiment of the present application can reduce the thickness of the whole hot melt adhesive 10 by removing the hard base material, and under the condition that the thickness specification of the prepared laminate polymer battery is fixed, the energy density of the laminate polymer battery prepared by using the hot melt adhesive 10 provided in the embodiment of the present application is higher (compared with the energy density of the laminate polymer battery prepared by using the structure of the conventional hot melt adhesive 10).
In fact, to facilitate the distinction between the first adhesive layer 11 and the second adhesive layer 12 for the user, the first adhesive layer 11 and the second adhesive layer 12 can be mixed with toner paints with different colors, which can help the user or an induction identification device to quickly distinguish the first adhesive layer 11 from the second adhesive layer 12 during the application of the hot melt adhesive 10, so as to ensure that the first adhesive layer 11 is adhered to the membrane 20, and reduce the condition that the adhesion positions of the first adhesive layer 11 and the second adhesive layer 12 are reversed. Illustratively, the toner paint may be one or more of cobalt titanium green, titanium nickel yellow, titanium chromium brown, titanium white, phthalocyanine blue, lemon yellow, and carbon black, and the toner paint blended in the first adhesive layer 11 is different from the toner paint blended in the second adhesive layer 12.
Optionally, the first glue layer 11 further includes ceramic.
As described above, the first adhesive layer 11 formed by doping the ceramic into the material forming the first adhesive layer 11 has a certain hardness, so as to reduce the probability that the first adhesive layer 11 is distorted and deformed under the action of an external force, which can make the hot melt adhesive 10 maintain a good structural stability as a whole under the condition of improving the energy density of the lithium ion battery (i.e., the content of active substances in the lithium ion battery is adaptively increased by removing the hard base material 13 in the hot melt adhesive 10), and further enhance the drop resistance of the lithium ion battery.
Illustratively, the ceramic may be at least one of boehmite, alumina, titania, silica, silicon carbide, barium sulfate, calcium sulfate, or glass fiber. Preferably, the ceramic is aluminum oxide, so that the ceramic has the advantages of wide and easily-obtained material source, low cost, high temperature resistance and good electrochemical stability.
Optionally, the grain size of the ceramic is greater than or equal to 0.1 micrometer and less than or equal to 10 micrometers.
As described above, the particle size of the ceramic in the first adhesive layer 11 is controlled to be between 0.1 micron and 10 microns, in some embodiments of the present application, the particle size of the ceramic in the first adhesive layer 11 may specifically be 1 micron, 2 microns, 4 microns, 8 microns, and the like, and by the above particle size control, on one hand, the particle size of the ceramic can be avoided to be too small (smaller than 0.1 micron), and the problem of reduced initial adhesion caused by too dense internal material of the first adhesive layer 11 is avoided; on the other hand, the problem of viscosity reduction caused by excessive loosening of the internal material of the first adhesive layer 11 can be avoided, and the viscosity of the whole first adhesive layer 11 can be maintained within an appropriate numerical range.
Wherein the particle size of the ceramic is 0.1 μm or more and 10 μm or less, it can be understood that the particle size of D10 of the ceramic particles is 0.1 μm and the particle size of D90 of the ceramic particles is 10 μm.
The initial adhesion is understood to mean the adhesion that occurs when the first adhesive layer 11 first comes into contact with the surface of the object to be bonded, for example the membrane 20.
Optionally, the first adhesive layer 11 further includes a tackifying resin.
As described above, in the process of forming the first adhesive layer 11, the viscosity of the first adhesive layer 11 is further increased by means of incorporating the tackifying resin, so that the adhesive strength between the first adhesive layer 11 and the separator 20 is further increased, and the drop resistance of the lithium ion battery (to which the hot melt adhesive 10 provided in the embodiments of the present application is applied) is further improved.
The tackifying resin may be at least one of rosin resin, terpene resin, petroleum resin, and phenolic resin, and in practice, the specific components of the tackifying resin may be adjusted by a user according to needs, which is not limited in the embodiments of the present application.
In practice, it is preferable to provide the first glue layer 11 including polyvinylidene fluoride, ceramic and tackifying resin.
Optionally, the viscosity of the second adhesive layer 12 is greater than 0 and less than or equal to 1kgf per square millimeter.
As described above, the user may be at 0 to 1kgf/mm2(kilogram force per square millimeter) and the viscosity of the second adhesive layer 12, in some embodiments of the present application, the viscosity of the second adhesive layer 12 may be specifically 0.1kgf/mm2、0.2kgf/mm2、0.5kgf/mm2、0.8kgf/mm2And the like, so as to meet the bonding requirements under different scenes, and the hot melt adhesive 10 has better applicability as a whole.
Optionally, the mass ratio of the polyvinylidene fluoride in the first rubber layer 11 is greater than or equal to 0.4 and less than or equal to 0.8.
As described above, by controlling the mass ratio of the polyvinylidene fluoride in the first adhesive layer 11 to be between 0.4 and 0.8, on the basis of ensuring that the formed first adhesive layer 11 has excellent adhesive performance (ensuring that the first adhesive layer 11 can be firmly adhered to the diaphragm 20), the problem of poor structural stability caused by too much mass ratio of the polyvinylidene fluoride in the first adhesive layer 11 is avoided, and a space is provided for the sufficient exertion of the functions of other components forming the first adhesive layer 11 (for example, in the case that the first adhesive layer 11 further includes an antioxidant and a viscosity regulator, by the above arrangement, the problem of too low mass ratio of the components such as the antioxidant and the viscosity regulator in the first adhesive layer 11 is avoided, and the antioxidant function of the antioxidant and the viscosity regulating function of the viscosity regulator are ensured to be sufficiently exerted).
Optionally, the thickness of the first glue layer 11 is greater than or equal to 5 micrometers and less than or equal to 35 micrometers;
the thickness of the second glue layer 12 is greater than or equal to 5 micrometers and less than or equal to 35 micrometers.
As described above, the user can adaptively adjust the thicknesses of the first adhesive layer 11 and the second adhesive layer 12 within the range of 5 micrometers to 35 micrometers to meet the requirements of lithium ion batteries with different thickness specifications, which can further improve the applicability of the hot melt adhesive 10 in complex scenes. In some embodiments of the present application, the first glue layer 11 may be specifically 10 microns, 13 microns, 17 microns, 23 microns, 30 microns, and the like.
It should be noted that, in practice, the thickness of the first adhesive layer 11 and the thickness of the second adhesive layer 12 may be the same or different, and a user may adjust the thickness of the first adhesive layer 11 and the thickness of the second adhesive layer 12 respectively to adapt to different bonding requirements of different objects, which is not limited in the embodiment of the present application.
Optionally, the molecular weight of the first glue layer 11 is greater than or equal to 5 mol/g and less than or equal to 2 × 106Moles per gram; the molecular weight of the second adhesive layer 12 is greater than or equal to 1mol per gram and less than or equal to 106Moles per gram.
As described above, by controlling the molecular weight of the second glue layer 12 to be 1mol/g to 106The mol/g range ensures that the viscosity of the second adhesive layer 12 can be controlled to be 0 to 1kgf/mm2While avoiding the problem of too low initial adhesion of the second adhesive layer 12 (when the molecular weight of the second adhesive layer 12 is too high, the initial adhesion of the second adhesive layer 12 is reduced accordingly).
The purpose of controlling the molecular weight of the first glue layer 11 is the same as the purpose of controlling the molecular weight of the second glue layer 12, and is not described again to avoid repetition.
Optionally, the hot melt adhesive 10 further includes a substrate 13, and the first adhesive layer 11 and the second adhesive layer 12 are respectively disposed on opposite sides of the substrate 13.
As mentioned above, in the case that the hot melt adhesive 10 does not include the substrate 13, as shown in fig. 1, the first adhesive layer 11 and the second adhesive layer 12 are adjacent to each other, and in this case, in order to ensure the structural stability of the whole hot melt adhesive 10, it is preferable that the first adhesive layer 11 includes ceramic, so that the first adhesive layer 11 has a suitable hardness, and the first adhesive layer 11 is prevented from deforming under the action of external force.
In the case that the hot melt adhesive 10 includes the substrate 13, as shown in fig. 2, the first adhesive layer 11 and the second adhesive layer 12 are respectively disposed on two opposite sides of the substrate 13 (the first adhesive layer 11 and the second adhesive layer 12 are not in contact with each other), and a projection of the first adhesive layer 11 on the substrate 13 and a projection of the second adhesive layer 12 on the substrate 13 may partially overlap or completely overlap, which is not limited in this application.
In fact, the structural strength of the hot melt adhesive structure shown in fig. 2 is better than that of the hot melt adhesive structure shown in fig. 1, and the thickness of the hot melt adhesive structure shown in fig. 1 is smaller than that of the hot melt adhesive structure shown in fig. 2 (in the case that the thicknesses of the first adhesive layers 11 and the thicknesses of the second adhesive layers 12 of the two hot melt adhesive structures are the same), a user can select any one of the two hot melt adhesive structures 10 based on the requirement adaptability, which is not limited in the embodiment of the present application.
An embodiment of the present application further provides a lithium ion battery, including:
a diaphragm 20, an electrolyte, a packaging shell, a positive plate, a negative plate and the hot melt adhesive 10 of the previous embodiment.
For example, the above lithium ion battery may be prepared by stacking the above positive electrode sheet, the above separator 20, and the above negative electrode sheet in sequence, and winding the stacked positive electrode sheet, the above separator 20, and the above negative electrode sheet in the same direction with a winding needle as an axis, and forming a soft-package cell; place soft-packaged electrical core in package housing afterwards to all correspond on diaphragm 20 on soft-packaged electrical core surface and package housing's the internal surface and place aforementioned embodiment hot melt adhesive 10, turn over and roll over package housing to make hot melt adhesive 10 press from both sides and locate between diaphragm 20 on soft-packaged electrical core surface and package housing's the internal surface, later through the mode of hot pressing, make hot melt adhesive 10 turn into the molten state by solid-state, with the clearance between diaphragm 20 on fully filling soft-packaged electrical core surface and the internal surface of package housing, the fixed of soft-packaged electrical core in package housing is accomplished promptly after hot melt adhesive 10 solidifies, pour into appropriate amount electrolyte into in the soft-packaged electrical core afterwards, and after standing for a period, cut out above-mentioned package housing, and obtain above-mentioned lithium ion battery after sealing package housing.
For example, the position of the hot melt adhesive 10 on the membrane 20 on the surface of the flexible package cell is shown in fig. 3 (the ending adhesive 30 in fig. 3 is another adhesive material except for the hot melt adhesive 10), and in practice, a user may adaptively adjust the position of the hot melt adhesive 10 on the membrane 20 on the surface of the flexible package cell, which is not limited in the embodiment of the present application.
It should be noted that, in practice, the hot melt adhesive 10 described in the embodiment of the present application is used for bonding the separator 20 and the outer casing of the pouch battery; the hot melt adhesive can also be used for bonding a tab and a pole piece, under the condition that the hot melt adhesive 10 is used for fixing the tab, one part of the second adhesive layer 12 is bonded with the base material 13 of the pole piece, the other part of the second adhesive layer 12 is bonded with the tab so as to fix the tab on the corresponding pole piece, meanwhile, the first adhesive layer 11 is bonded with the diaphragm 20 adjacent to the pole piece, and the first adhesive layer 11 is matched with the first adhesive layer 11 to further fix the position of the tab on the pole piece under the condition of fully utilizing polyvinylidene fluoride in the first adhesive layer 11 (by utilizing the strong bonding relation between the first adhesive layer 11 and the diaphragm 20, the probability that the hot melt adhesive 10 is subjected to the expansion stress action of an active coating on the surface of the pole piece to cause position deviation).
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A hot melt adhesive, comprising:
the adhesive tape comprises a first adhesive layer and a second adhesive layer which are arranged in a stacked mode, wherein the first adhesive layer comprises polyvinylidene fluoride.
2. The hot melt adhesive according to claim 1, further comprising a substrate, wherein the first adhesive layer and the second adhesive layer are respectively disposed on opposite sides of the substrate.
3. The hot melt adhesive according to claim 1, wherein the mass ratio of the polyvinylidene fluoride in the first adhesive layer is greater than or equal to 0.4 and less than or equal to 0.8.
4. The hot melt adhesive of claim 1, wherein the first adhesive layer further comprises a ceramic.
5. The hot melt adhesive of claim 4, wherein the ceramic has a particle size of greater than or equal to 0.1 micrometers and less than or equal to 10 micrometers.
6. The hot melt adhesive of claim 1, wherein the first adhesive layer further comprises a tackifying resin.
7. The hot melt adhesive of claim 1, wherein the thickness of the first adhesive layer is greater than or equal to 5 micrometers and less than or equal to 35 micrometers;
the thickness of the second glue layer is greater than or equal to 5 micrometers and less than or equal to 35 micrometers.
8. The hot melt adhesive of claim 1, wherein the viscosity of the second adhesive layer is greater than 0 and less than or equal to 1kgf per square millimeter.
9. The hot melt adhesive of claim 1, wherein the molecular weight of the first adhesive layer is greater than or equal to 5 moles per gram and less than or equal to 2 x 106Moles per gram; the molecular weight of the second glue layer is more than or equal to 1mol per gram and less than or equal to 106Moles per gram.
10. A lithium ion battery, which is characterized by comprising a diaphragm, an electrolyte, a packaging shell, a positive plate, a negative plate and the hot melt adhesive of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111430631.3A CN114133890A (en) | 2021-11-29 | 2021-11-29 | Hot melt adhesive and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111430631.3A CN114133890A (en) | 2021-11-29 | 2021-11-29 | Hot melt adhesive and lithium ion battery |
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| Publication Number | Publication Date |
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| CN114133890A true CN114133890A (en) | 2022-03-04 |
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| CN202111430631.3A Pending CN114133890A (en) | 2021-11-29 | 2021-11-29 | Hot melt adhesive and lithium ion battery |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105355957A (en) * | 2015-10-16 | 2016-02-24 | 广东烛光新能源科技有限公司 | Electrochemical cell and method of making same |
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2021
- 2021-11-29 CN CN202111430631.3A patent/CN114133890A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105355957A (en) * | 2015-10-16 | 2016-02-24 | 广东烛光新能源科技有限公司 | Electrochemical cell and method of making same |
Non-Patent Citations (1)
| Title |
|---|
| 刘文国 等: "《汽车电工材料》", vol. 1, 人民交通出版社, pages: 66 * |
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