CN113422163A - Pole lug adhesive film for lithium battery pole lug and preparation method thereof - Google Patents

Pole lug adhesive film for lithium battery pole lug and preparation method thereof Download PDF

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Publication number
CN113422163A
CN113422163A CN202110825022.1A CN202110825022A CN113422163A CN 113422163 A CN113422163 A CN 113422163A CN 202110825022 A CN202110825022 A CN 202110825022A CN 113422163 A CN113422163 A CN 113422163A
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layer
temperature
resistant
woven fabric
fiber non
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王芳
吕松
单化众
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Changzhou Sveck Photovoltaic New Material Co ltd
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Changzhou Sveck Photovoltaic New Material Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • 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
    • C09J133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/064—Copolymers with monomers not covered by C09J133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention relates to the technical field of battery safety protection, in particular to a tab adhesive film for a lithium battery tab and a preparation method thereof, wherein the tab adhesive film comprises a metallocene modified cpp layer, a high-temperature resistant reticular fiber non-woven fabric layer, a high-temperature resistant pp layer, a high-temperature resistant reticular fiber non-woven fabric layer and a metallocene modified cpp layer which are sequentially stacked from outside to inside; the modified polypropylene pressure-sensitive adhesive layers are coated on two sides of the high-temperature-resistant reticular fiber non-woven fabric layer, and can enter the high-temperature-resistant reticular fiber non-woven fabric layer to increase the cohesiveness, so that the bonding degree of the cpp layer on the outer layer and the middle high-temperature-resistant reticular fiber non-woven fabric layer is strengthened, and the phenomenon of layering among the cpp layer, the pp layer and the high-temperature-resistant reticular fiber non-woven fabric layer is avoided in the recycling process of the battery and under the condition of long-term soaking in electrolyte; two high-temperature-resistant reticular fiber non-woven fabric layers are introduced, so that the short circuit phenomenon under the condition of over-melting is effectively avoided, and the use safety of the battery is ensured.

Description

Pole lug adhesive film for lithium battery pole lug and preparation method thereof
Technical Field
The invention relates to the technical field of battery safety protection, in particular to a tab adhesive film for a lithium battery tab and a preparation method thereof.
Background
The battery tab is generally formed by hot-pressing and compounding a metal belt and tab adhesive tapes symmetrically attached to two surfaces of the metal belt, wherein the tab adhesive tapes mainly play an insulating role and prevent the metal belt from being in direct contact with an aluminum plastic film to form a short circuit. When the packaging of the tab is uneven, the packaging pressure is too high or the packaging temperature is too high, the tab adhesive and the CPP layer of the aluminum plastic film are excessively melted, so that the metal strip is contacted with the aluminum layer in the middle of the aluminum plastic film after penetrating through the CPP layer of the tab adhesive and the aluminum plastic film, the battery is corroded, the liquid leaks at the tab and expands the battery, and the battery is short-circuited, ignited and the like.
The middle film layer of the three-layer tab glue is generally made of a material with a high melting point, and the surface film layer is formed by co-extruding a material with a low melting point; because the materials of the middle film layer and the surface film layer are different, the phenomenon of layering of tab glue is easy to occur, so that the seal is cracked, and finally the electrolyte leaks. When the three-layer tab glue is subjected to high-temperature hot-pressing sealing, the inner layer can deform to a certain extent, and the problem of liquid leakage can be caused when the three-layer tab glue is used.
Disclosure of Invention
The purpose of the invention is: overcome not enough among the prior art, provide a lithium cell is utmost point ear glued membrane for utmost point ear, this utmost point ear glued membrane is difficult for appearing the overfusion problem with the plastic-aluminum membrane when the heat-seal, can not take place the layering phenomenon between each rete of this utmost point ear glued membrane, can not lead to sealing the fracture in the use, and electrolyte leaks.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a tab adhesive film for a lithium battery tab comprises a metallocene modified cpp layer, a high-temperature resistant reticular fiber non-woven fabric layer, a high-temperature resistant pp layer, a high-temperature resistant reticular fiber non-woven fabric layer and a metallocene modified cpp layer which are sequentially stacked from outside to inside.
Further, the metallocene-modified cpp layer has a thickness of 10 to 50 μm.
Furthermore, the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer are respectively coated with a layer of modified polypropylene pressure-sensitive adhesive layer.
Further, the thickness of the modified polypropylene pressure-sensitive adhesive layer is 0.1-10 μm;
the modified polypropylene pressure-sensitive adhesive comprises 80-92 wt% of a main monomer, 0.2-1 wt% of an initiator, 1.5-5 wt% of a cross-linking agent, 3-5 wt% of an emulsifier and 3-5 wt% of a modifier;
the main monomers comprise soft monomers of isooctyl acrylate and butyl acrylate, hard monomers of styrene and functional monomers of acrylic acid,
the initiator is ammonium persulfate;
the cross-linking agent is N-methylol acrylamide;
the emulsifier is selected from one of anionic type, cationic type and nonionic type;
the modifier is organic silicon and rare earth ions Tb3+Inorganic nano particles, carbon nano tubes and graphene.
Furthermore, the content of the soft monomer isooctyl acrylate and butyl acrylate in the main monomer is 89.5 wt%, and the mass ratio of the soft monomer isooctyl acrylate to the butyl acrylate is 2: 1; the hard monomer styrene accounted for 7 wt% of the main monomer, and the functional monomer acrylic acid accounted for 3.5 wt% of the main monomer.
Further, the thickness of the high-temperature resistant reticular fiber non-woven fabric layer is 5-50 μm.
Further, the material of the high temperature resistant reticular fiber in the high temperature resistant reticular fiber non-woven fabric layer is selected from one of PEEK, PPS, PAI, PTFE and silicon fluorine resin;
the high-temperature resistant reticular fiber is white, black or yellow in color.
Further, the mesh of the reticular fiber is one of hexagonal, circular and quadrangular.
Furthermore, the thickness of the high-temperature-resistant pp layer is 10-80 μm.
Another object of the invention is: the preparation method solves the problem of poor plasticizing effect of a multi-layer co-extrusion same-temperature film head on different materials in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a tab adhesive film for a lithium battery tab comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
The technical scheme adopted by the invention has the beneficial effects that:
1. according to the tab adhesive film for the lithium battery tab, the modified polypropylene pressure-sensitive adhesive layers are coated on the two surfaces of the high-temperature-resistant reticular fiber non-woven fabric layer, and can enter the high-temperature-resistant reticular fiber non-woven fabric layer to increase the cohesiveness, so that the combination degree of the cpp layer at the outer layer and the middle high-temperature-resistant reticular fiber non-woven fabric layer is strengthened, and the phenomenon of layering among the cpp layer, the pp layer and the high-temperature-resistant reticular fiber non-woven fabric layer is avoided in the recycling process of the battery and under the condition of long-term soaking in electrolyte;
2. according to the tab adhesive film for the lithium battery tab, two high-temperature-resistant reticular fiber non-woven fabric layers are introduced, so that the tab metal sheet is effectively prevented from being contacted with the aluminum layer of the aluminum plastic film under the condition of heat sealing and over-melting, the phenomena of corrosion, liquid leakage and even short circuit ignition of the battery are avoided, the short circuit phenomenon under the condition of over-melting is effectively avoided, and the use safety of the battery is ensured;
3. according to the tab adhesive film for the lithium battery tab, the color master batch is added to the high-temperature-resistant pp layer, so that various colors can be prepared, and the tab adhesive film is convenient to distinguish quickly.
4. The preparation method of the tab adhesive film for the lithium battery tab comprises the steps of compounding cpp and pp on a high-temperature-resistant reticular fiber non-woven fabric layer in two steps, and curtain coating the outer cpp on the high-temperature-resistant reticular fiber non-woven fabric layer; and the single-layer cast extrusion and the high-temperature-resistant PP layer are subjected to hot-pressing compounding, so that the problem of uneven plasticization of different materials at the same temperature of the film head of the conventional multi-layer co-extruded tab glue can be solved.
Drawings
Fig. 1 is a schematic layer structure diagram of a tab adhesive film for a lithium battery tab in the present invention.
Fig. 2 is a flow chart of a method for manufacturing a tab adhesive film for connecting a battery tab in the invention.
In the figure: 1 metallocene modified cpp layer, 2 modified polypropylene pressure sensitive adhesive layer, 3 non-woven fabrics layer, 4 high temperature resistant pp layer.
Detailed Description
The invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. The following examples are intended to provide those skilled in the art with a more complete understanding of the present invention, and are not intended to limit the scope of the present invention. Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The lithium battery in the invention is a flexible package lithium battery.
The contents in the present invention are all mass percentages unless otherwise specified.
Comparative example:
the utility model provides a lithium cell is utmost point ear glue for utmost point ear, its structure by outer and interior cpp layer, high temperature resistant pp layer and cpp layer in proper order, wherein: the cpp layer is 30 mu m thick, the high-temperature resistant pp layer is 40 mu m thick, the color is transparent white, and the total thickness of the tab glue is 100 mu m.
The preparation method of the tab glue in the comparative example 1 is a conventional method in the field, namely the cpp layer and the pp layer are compounded on the high-temperature resistant reticular fiber non-woven fabric layer by adopting a one-step method (outer cpp and pp layer calendering and co-extrusion).
The first embodiment is as follows:
a tab adhesive for a lithium battery tab comprises a metallocene modified cpp layer (Singapore polyolefin fs66121, Japan three-well TAFMER XM), a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer, a milky high-temperature resistant pp layer (Shanghai Seikeke S2040, Korea Xiaoxing J945), a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer and a metallocene modified cpp layer from outside to inside in sequence,
wherein the thickness of the metallocene modified cpp layer is 40 μm, the thickness of the modified polypropylene pressure sensitive adhesive layer is 8 μm, the thickness of the high temperature resistant mesh fiber non-woven fabric PPS (Wodeff, Nippon dongli) layer is 8 μm, and the color is yellow; the thickness of the high-temperature resistant pp layer is 20 mu m, and the color is opaque white; the total thickness of the tab glue is 148 mu m.
The modified polypropylene pressure-sensitive adhesive layer comprises the following components in percentage by weight: 92% of main monomer, wherein the soft monomers of isooctyl acrylate and butyl acrylate in the main monomer account for 89.5% of the main monomer, the proportion of the isooctyl acrylate and the butyl acrylate is 2:1, the hard monomer of styrene accounts for 7% of the main monomer, and the functional monomer of acrylic acid accounts for 3.5% of the main monomer; 0.5% of ammonium persulfate, 1.5% of N-hydroxymethyl acrylamide, 3% of anionic emulsifier and 3% of graphene; the specific kind and substance of the anionic emulsifier in the present embodiment are not limited, and may be, for example: sodium stearate or soap laurate, and the like.
High temperature resistant reticular fiber non-woven fabrics layer, high temperature resistant reticular fiber are white PPS, and its mesh is the hexagon, can be regular hexagon or irregular hexagon.
The preparation method of the tab glue for the lithium battery tab in the embodiment comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
Comparative example 1:
the preparation process in this example was carried out according to a conventional preparation method, and the rest was the same as in example 1.
Comparative example 2:
the same as example 1 is the same except that only one high temperature resistant web nonwoven fabric layer is provided in this example.
Example two:
the utility model provides a lithium battery is utmost point ear glue for utmost point ear, its structure by outer and interior in proper order: the composite material comprises a metallocene modified cpp layer, a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer, a milky high-temperature resistant pp layer, a modified polypropylene pressure-sensitive adhesive layer, a high-temperature resistant reticular fiber non-woven fabric layer, a modified polypropylene pressure-sensitive adhesive layer and a metallocene modified cpp layer.
Wherein: the thickness of the metallocene modified cpp layer is 20 μm, the thickness of the modified polypropylene pressure-sensitive adhesive layer is 5 μm, the thickness of the high-temperature resistant mesh fiber non-woven PEEK (Germany winning, American Infinity, Italy Latito) layer is 20 μm, and the color is white; the thickness of the high-temperature resistant pp layer is 40 mu m, and the color is transparent white; the total thickness of the tab glue is 140 mu m.
The modified polypropylene pressure-sensitive adhesive layer comprises the following components in percentage by mass: 88.5 percent of main monomer, wherein the soft monomer of isooctyl acrylate and butyl acrylate in the main monomer accounts for 89.5 percent of the content of the main monomer, the proportion of the isooctyl acrylate and the butyl acrylate in the main monomer is 2:1, the hard monomer of styrene accounts for 7 percent of the content of the main monomer, and the functional monomer of acrylic acid accounts for 3.5 percent of the content of the main monomer; 0.5% of ammonium persulfate, 3% of N-hydroxymethyl acrylamide, 3% of anionic emulsifier and 5% of graphene; the specific kind and substance of the anionic emulsifier in the present embodiment are not limited, and may be, for example: sodium stearate or soap laurate, and the like.
The high-temperature resistant reticular fiber non-woven fabric layer is characterized in that the high-temperature resistant reticular fiber is white PEEK, the shape of meshes is quadrilateral, can be regular quadrilateral or irregular quadrilateral, and is preferably regular quadrilateral, such as square, rectangle and parallelogram.
The preparation method of the tab glue for the lithium battery tab in the embodiment comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
Example three:
the utility model provides a lithium battery is utmost point ear glue for utmost point ear, its structure by outer and interior in proper order: the modified polypropylene pressure sensitive adhesive layer is arranged on the metallocene modified cpp layer; a modified polypropylene pressure sensitive adhesive layer and a metallocene modified cpp layer.
Wherein: the thickness of the metallocene modified cpp layer is 20 μm, the thickness of the modified polypropylene pressure sensitive adhesive layer is 3 μm, the thickness of the high temperature resistant reticular fiber non-woven fabric PAI (Deyi new material) layer is 30 μm, the thickness of the high temperature resistant pp layer is 60 μm, the color is black, and the total thickness of the tab adhesive is 172 μm.
The modified polypropylene pressure-sensitive adhesive layer comprises the following components in percentage by mass: 84% of main monomer, wherein the soft monomers of isooctyl acrylate and butyl acrylate in the main monomer account for 89.5% of the main monomer, the proportion of the isooctyl acrylate and the butyl acrylate is 2:1, the hard monomer of styrene accounts for 7% of the main monomer, and the functional monomer of acrylic acid accounts for 3.5% of the main monomer; 1% of ammonium persulfate, 5% of N-methylolacrylamide, 5% of an anionic emulsifier, and 5% of graphene, wherein specific types and substances of the anionic emulsifier in this embodiment are not limited, and may be, for example: sodium stearate or soap laurate, and the like.
The preparation method of the tab glue for the lithium battery tab in the embodiment comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
The tab adhesive product is tested for 180-degree stripping force, high-temperature electrolyte resistance performance index, weather resistance, heat sealing and side voltage (the side voltage is less than 1V, the test is qualified).
The 180 DEG peel force is tested with reference to the GB/T2792-2014 standard. All test data are compared in table 1 below.
Table 1 specific performance tests for each example control.
Figure BDA0003173435890000091
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. The utility model provides a utmost point ear glued membrane for lithium cell utmost point ear which characterized in that: the high-temperature-resistant net-shaped fiber non-woven fabric comprises a metallocene modified cpp layer, a high-temperature-resistant net-shaped fiber non-woven fabric layer, a high-temperature-resistant pp layer, a high-temperature-resistant net-shaped fiber non-woven fabric layer and a metallocene modified cpp layer which are sequentially stacked from outside to inside.
2. The tab film as claimed in claim 1, wherein: the metallocene-modified cpp layer has a thickness of 10 to 50 μm.
3. The tab film as claimed in claim 1, wherein: the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer are respectively coated with a layer of modified polypropylene pressure-sensitive adhesive layer.
4. The tab film as claimed in claim 3, wherein: the thickness of the modified polypropylene pressure-sensitive adhesive layer is 0.1-10 mu m;
the modified polypropylene pressure-sensitive adhesive comprises 80-92 wt% of a main monomer, 0.2-1 wt% of an initiator, 1.5-5 wt% of a cross-linking agent, 3-5 wt% of an emulsifier and 3-5 wt% of a modifier;
the main monomers comprise soft monomers of isooctyl acrylate and butyl acrylate, hard monomers of styrene and functional monomers of acrylic acid,
the initiator is ammonium persulfate;
the cross-linking agent is N-methylol acrylamide;
the emulsifier is selected from one of anionic type, cationic type and nonionic type;
the modifier is organic silicon and rare earth ions Tb3+Inorganic nano particles, carbon nano tubes and graphene.
5. The tab film as claimed in claim 4, wherein: the content of the soft monomer isooctyl acrylate and butyl acrylate in the main monomer is 89.5 wt%, and the mass ratio of the soft monomer isooctyl acrylate to the butyl acrylate is 2: 1; the hard monomer styrene accounted for 7 wt% of the main monomer, and the functional monomer acrylic acid accounted for 3.5 wt% of the main monomer.
6. The tab film as claimed in claim 1, wherein: the thickness of the high-temperature resistant reticular fiber non-woven fabric layer is 5-50 mu m.
7. The tab film as claimed in claim 1, wherein: the high-temperature resistant reticular fiber material in the high-temperature resistant reticular fiber non-woven fabric layer is selected from one of PEEK, PPS, PAI, PTFE and silicon fluorine resin;
the high-temperature resistant reticular fiber is white, black or yellow in color.
8. The tab film as claimed in claim 1, wherein: the mesh of the reticular fiber is one of hexagonal, circular and quadrilateral.
9. The tab film as claimed in claim 1, wherein: the thickness of the high-temperature-resistant pp layer is 10-80 mu m.
10. The method for manufacturing a tab film for a lithium battery tab as claimed in any one of claims 1 to 9, wherein: the preparation method comprises the following steps:
1) placing the high-temperature-resistant reticular fiber non-woven fabric layer on a coating machine, coating a layer of modified polypropylene pressure-sensitive adhesive layer on the upper surface and the lower surface of the high-temperature-resistant reticular fiber non-woven fabric layer in a planar manner, simultaneously curtain coating the metallocene modified cpp layer extruded out in a casting manner on the other surface of the modified polypropylene pressure-sensitive adhesive layer, and marking the prepared semi-finished product as a semi-finished product I;
2) adding color master batches into the high-temperature-resistant pp particles to prepare a colored high-temperature-resistant pp layer, and marking the prepared semi-finished product as a semi-finished product II;
3) and finally, placing the semi-finished product II between two layers of the semi-finished product I for hot-pressing compounding, wherein the modified pressure-sensitive adhesive layer surface of the semi-finished product I is connected with the semi-finished product II.
CN202110825022.1A 2021-07-21 2021-07-21 Pole lug adhesive film for lithium battery pole lug and preparation method thereof Pending CN113422163A (en)

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* Cited by examiner, † Cited by third party
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CN114597474A (en) * 2022-03-21 2022-06-07 珠海冠宇电池股份有限公司 Battery with a battery cell
CN115029073A (en) * 2022-06-28 2022-09-09 常州斯威克光伏新材料有限公司 High-adhesion high-temperature-resistant tab adhesive and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114597474A (en) * 2022-03-21 2022-06-07 珠海冠宇电池股份有限公司 Battery with a battery cell
CN115029073A (en) * 2022-06-28 2022-09-09 常州斯威克光伏新材料有限公司 High-adhesion high-temperature-resistant tab adhesive and preparation method thereof
CN115029073B (en) * 2022-06-28 2024-06-11 常州斯威克光伏新材料有限公司 High-cohesiveness high-temperature-resistant tab adhesive and preparation method thereof

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