CN106905872B - Edge trimming process of soft package lithium battery - Google Patents
Edge trimming process of soft package lithium battery Download PDFInfo
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- CN106905872B CN106905872B CN201710137961.0A CN201710137961A CN106905872B CN 106905872 B CN106905872 B CN 106905872B CN 201710137961 A CN201710137961 A CN 201710137961A CN 106905872 B CN106905872 B CN 106905872B
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- 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
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- 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
- C09J11/06—Non-macromolecular additives organic
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- 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
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
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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
- 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
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- 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
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- 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
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- 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
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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- 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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- 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
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Abstract
The invention relates to the technical field of soft package lithium battery assembly, in particular to an edge trimming process of a soft package lithium battery, which comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material. According to the invention, the flame-retardant adhesive tape with flame retardance is used for replacing the traditional yellow adhesive tape, so that the flame-retardant property of the lithium battery is improved, and the safety of the soft package lithium battery is improved.
Description
Technical Field
The invention relates to the technical field of soft package lithium battery assembly, in particular to an edge trimming process of a soft package lithium battery.
Background
In the prior art, a lithium battery has the advantages of no pollution, high capacity, long cycle life and the like, and is an important energy product, but the battery of the Samsung note7 explodes to warn consumers and manufacturers, and the safety performance of the lithium battery cannot be ignored.
And an important ring in the production of soft package lithium battery lies in using the sticky tape to fix the banding of soft package lithium battery, consequently adopts the sticky tape of fire resistance to certainly can improve the security performance of lithium battery, effectively takes precautions against the potential safety hazard of battery nature. However, the existing lithium battery adhesive tape generally adopts a common yellow adhesive tape, does not have flame retardance, has insufficient bonding performance, and causes unstable edge sealing, the air bag is easy to shake to generate redundant gas, and the performance and the service life of the soft package lithium battery are reduced.
Moreover, once electrolyte leakage occurs, the common yellow glue basically loses viscosity once contacting the electrolyte, so that the edge sealing is unstable and the electrolyte leakage speed is higher.
Disclosure of Invention
The invention aims to provide an edge trimming process of a soft package lithium battery, which can improve the safety performance of the soft package lithium battery, aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme:
the edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
in the formula of the application, isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, laurate acrylate and butyl acrylate are subjected to free radical polymerization under the action of an initiator to form an acrylic copolymer, and a cross-linking agent and n-dodecyl mercaptan are used for adjusting the cohesive force and the adhesive force of the acrylic copolymer, so that the copolymer with a three-dimensional network structure is formed, the infiltration corrosion of electrolyte can be effectively resisted, and no impurity is dissolved out basically while the long-acting adhesive force is kept in the electrolyte; and due to the characteristics of the network structure, the flame retardant can be uniformly dispersed, the agglomeration phenomenon of the flame retardant is avoided, the flame retardant can not be separated out by electrolyte, the flame retardant property of the copolymer is improved, and the adhesive property of the copolymer is also kept.
Preferably, the flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
the crosslinking agent of the present application may be a commercially available crosslinking agent commonly used, such as a polyisocyanate-based crosslinking agent, a polyamine-based crosslinking agent, a polyol-based crosslinking agent, an aziridine-based crosslinking agent, an acrylate-based crosslinking agent, a metal organic compound, and the like, and preferably, the crosslinking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 1: 1-3: 1 in a certain proportion. The selection and combination of the cross-linking agent is decisive for the formation of the network structure of the acrylic copolymer, and for the acrylic monomer combination system, the acrylic monomer combination system is prepared by mixing toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 1: 1-3: the cross-linking agent with the proportion of 1 can improve the bonding capability and the lasting bonding capability of the flame-retardant adhesive tape more than the single cross-linking agent.
Further, the weight ratio of the crosslinking agent to n-dodecyl mercaptan is 10: 1. the crosslinking agent and the n-dodecyl mercaptan supplement each other and adjust the cohesive force and the viscosity of the acrylic copolymer, and the weight ratio of the crosslinking agent to the n-dodecyl mercaptan is more than 10: 1 hour, fire-retardant acrylic acid viscose layer hardness is great, is difficult to nimble adaptation to the accurate processing requirement of lithium cell, and the weight ratio is less than 10: 1, the viscosity-holding ability in the electrolyte is remarkably reduced, so that the preferable ratio is 10: 1.
wherein, the initiator can directly influence whether the polymerization process of the acrylic monomer can be smoothly carried out and can also influence the polymerization reaction rate, and preferably, the initiator is prepared by mixing dimethyl azodiisobutyrate and azodiisobutyronitrile in a weight ratio of 1-3: 1-3.
Wherein the flame retardant is at least one of hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene. The composite flame retardant, such as a phosphorus-nitrogen intumescent flame retardant, is not adopted in the flame retardant adhesive tape, because the improvement of the flame retardant performance is considered, whether the flame retardant is easy to precipitate in the acrylic copolymer to pollute the electrolyte is also considered, and whether the adopted flame retardant is easy to agglomerate is also considered to reduce the viscosity of the flame retardant adhesive tape. The hexaphenoxyalkylcyclotriphosphazene and/or hexaanilinocyclotriphosphazene adopted by the application have excellent compatibility in the acrylic copolymer system, do not influence the viscosity of the acrylic copolymer, and are not basically separated out by electrolyte, and further preferably, the flame retardant is prepared by mixing the hexaphenoxyalkylcyclotriphosphazene and the hexaanilinocyclotriphosphazene in a weight ratio of 2: 1, the adhesive capacity and the holding adhesive capacity of the flame-retardant adhesive tape can be improved.
Wherein the organic solvent is at least one of toluene, xylene and ethyl acetate.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 50-70 wt% of an organic solvent, heating to 80-90 ℃, fully reacting, cooling to 30-40 ℃, adding rosin pentaerythritol ester and the rest organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
The invention has the beneficial effects that: 1. according to the invention, the flame-retardant adhesive tape with flame retardance is used for replacing the traditional yellow adhesive tape, so that the flame-retardant property of the lithium battery is improved, and the safety of the soft package lithium battery is improved; 2. according to the invention, the formula of the flame-retardant adhesive tape is combined and improved, so that the adhesive property and the electrolyte corrosion resistance of the flame-retardant adhesive tape are improved.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
The edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
wherein the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 2: 1 in a certain proportion.
Wherein the initiator is prepared from dimethyl azobisisobutyrate and azobisisobutyronitrile according to a weight ratio of 1:1 in a certain proportion.
Wherein the flame retardant is prepared from hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 2: 1 in a certain proportion.
Wherein the organic solvent is ethyl acetate.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 60 wt% of an organic solvent, heating to 85 ℃, fully reacting, cooling to 35 ℃, adding rosin pentaerythritol ester and the rest of the organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
Example 2
The edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
wherein the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 3: 1 in a certain proportion.
Wherein the initiator is prepared from dimethyl azodiisobutyrate and azodiisobutyronitrile in a weight ratio of 2: 3 in proportion.
Wherein the flame retardant is prepared from hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 3: 1 in a certain proportion.
Wherein the organic solvent is xylene.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 70 wt% of an organic solvent, heating to 90 ℃, fully reacting, cooling to 40 ℃, adding rosin pentaerythritol ester and the rest of the organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
Example 3
The edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
wherein the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 1:1 in a certain proportion.
Wherein the initiator is prepared from dimethyl azodiisobutyrate and azodiisobutyronitrile in a weight ratio of 2: 1 in a certain proportion.
Wherein the flame retardant is prepared from hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 1:1 in a certain proportion.
Wherein the organic solvent is toluene.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 50 wt% of an organic solvent, heating to 80 ℃, fully reacting, cooling to 30 ℃, adding rosin pentaerythritol ester and the rest of the organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
Example 4
The edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
wherein the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 2: 1 in a certain proportion.
Wherein the initiator is prepared from dimethyl azodiisobutyrate and azodiisobutyronitrile in a weight ratio of 3: 1 in a certain proportion.
Wherein the flame retardant is prepared from hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 2: 1 in a certain proportion.
Wherein the organic solvent is a mixed solvent composed of toluene and xylene according to a weight ratio of 1: 1.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 65 wt% of an organic solvent, heating to 83 ℃, fully reacting, cooling to 33 ℃, adding rosin pentaerythritol ester and the rest of the organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
Example 5
The edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
wherein the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 2: 1 in a certain proportion.
Wherein the initiator is prepared from dimethyl azobisisobutyrate and azobisisobutyronitrile according to a weight ratio of 1:1 in a certain proportion.
Wherein the flame retardant is prepared from hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 2: 1 in a certain proportion.
Wherein the organic solvent is ethyl acetate.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 60 wt% of an organic solvent, heating to 85 ℃, fully reacting, cooling to 35 ℃, adding rosin pentaerythritol ester and the rest of the organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
Example 6
The edge trimming process of the soft package lithium battery comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape comprises a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material.
The flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
wherein the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 1: 1-3: 1 in a certain proportion.
Wherein the initiator is prepared from dimethyl azodiisobutyrate and azodiisobutyronitrile in a weight ratio of 1-3: 1-3.
Wherein the flame retardant is prepared from hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 2: 1 in a certain proportion.
Wherein the organic solvent is at least one of toluene, xylene and ethyl acetate.
The preparation method of the flame-retardant adhesive tape comprises the following steps: the flame-retardant adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 50-70 wt% of an organic solvent, heating to 80-90 ℃, fully reacting, cooling to 30-40 ℃, adding rosin pentaerythritol ester and the rest organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on a PET (polyethylene terephthalate) substrate.
The flame retardant adhesive tapes of examples 1 to 6 were subjected to performance tests. The test indexes and corresponding test conditions are as follows:
the testing method comprises the following steps of testing the temperature to be 23 +/-2 ℃, the relative humidity to be 60-70%, slightly pressing the flame-retardant adhesive tape with the width of 20mm on a clean aluminum plate by using a finger, carrying out back pressing for 3 times at the speed of 10m/min by using a 2Kg compression roller, standing for 20min or 24h, stripping the flame-retardant adhesive tape at the stripping speed of 300m/min and the stripping angle of 180 degrees, recording the stripping force and calculating the average value.
the testing method comprises the following steps of testing the temperature to be 23 +/-2 ℃, the relative humidity to be 60-70%, slightly pressing the flame-retardant adhesive tape with the width of 20mm on a clean aluminum plate by using a finger, performing back pressing for 3 times at the speed of 10m/min by using a 2Kg compression roller, standing for 24 hours, soaking the aluminum plate in the electrolyte for 10 minutes, peeling the flame-retardant adhesive tape at the peeling speed of 300m/min and the peeling angle of 180 degrees, recording the peeling force and calculating the average value.
and thirdly, conventional retention force, namely, the testing method comprises the steps of testing the temperature to be 23 +/-2 ℃, ensuring the relative humidity to be 60-70%, slightly pressing the flame-retardant adhesive tape on a clean aluminum plate by using a finger, ensuring the bonding area to be 20mmX20mm, carrying out back pressing for 3 times at the speed of 10m/min by using a 2Kg compression roller, standing for 20min, erecting the aluminum plate, hanging a 1Kg weight on the lowest end of the flame-retardant adhesive tape, loading for 1h, and recording the falling distance of the weight.
the testing method comprises the following steps of testing the temperature to be 23 +/-2 ℃, testing the relative humidity to be 60-70%, slightly pressing the flame-retardant adhesive tape with a finger to attach the adhesive tape to a clean aluminum plate, enabling the attachment area to be 20mmX20mm, carrying out back pressing for 3 times at the speed of 10m/min by using a 2Kg compression roller, standing for 20min, soaking the aluminum plate in the electrolyte for 10min, enabling the aluminum plate to be vertical, hanging a 1Kg weight at the lowest end of the flame-retardant adhesive tape, carrying out loading for 1h, and recording the falling distance of the weight.
fire resistance, conventional fire resistance rating test method.
It can be seen from the above table that the fire-retardant sticky tape of this application has good adhesion and retentivity, even by electrolyte soaking treatment after, the performance degradation is also very limited, and fire behaviour is excellent moreover, and the application can make soft packet of lithium cell's security performance promote in the technology of this application.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (1)
1. The edge trimming process of the soft package lithium battery is characterized by comprising the following steps of: the method comprises the following steps: (1) core making: respectively coating the positive electrode slurry and the negative electrode slurry on a positive plate and a negative plate, drying, rolling, cutting, welding a tab and winding into a battery cell; (2) pre-sealing: placing the winding core into an aluminum plastic film for packaging, reserving an air bag, injecting electrolyte, exhausting air and sealing; (3) trimming: cutting redundant air bag edges of the pre-sealed aluminum-plastic film, folding the residual air bag edges, attaching the edges to the battery cell, and finally fixing the edges by using a flame-retardant adhesive tape; the flame-retardant adhesive tape consists of a PET (polyethylene terephthalate) base material and a flame-retardant acrylic adhesive layer coated on the PET base material;
the flame-retardant acrylic adhesive layer is prepared from the following raw materials in parts by weight:
the cross-linking agent is prepared from toluene-2, 4-diisocyanate and aluminum acetylacetonate in a weight ratio of 1: 1-3: 1 in proportion;
the weight ratio of the cross-linking agent to the n-dodecyl mercaptan is 10: 1;
the initiator is prepared from dimethyl azodiisobutyrate and azodiisobutyronitrile in a weight ratio of 1-3: 1-3;
the flame retardant is prepared by mixing hexaphenoxyalkylcyclotriphosphazene and hexaanilinocyclotriphosphazene in a weight ratio of 2: 1 in proportion;
the organic solvent is at least one of toluene, xylene and ethyl acetate;
the preparation process of the flame-retardant adhesive tape comprises the following steps: mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, n-dodecyl mercaptan, a flame retardant and 50-70 wt% of an organic solvent, heating to 80-90 ℃, fully reacting, cooling to 30-40 ℃, adding rosin pentaerythritol ester and the rest of the organic solvent, uniformly stirring to obtain a flame-retardant acrylic adhesive, and coating the flame-retardant acrylic adhesive on the PET substrate to obtain the flame-retardant adhesive tape.
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| CN107312470A (en) * | 2017-07-14 | 2017-11-03 | 东莞市古川胶带有限公司 | One-faced tapes with fire resistance and preparation method thereof |
| CN108410381A (en) * | 2018-03-30 | 2018-08-17 | 追诚新能源材料（江苏）有限公司 | A kind of cooling adhesive tape |
| CN108822769B (en) * | 2018-04-26 | 2020-10-13 | 广东永邦新能源股份有限公司 | Insulating flame-retardant acrylic acid adhesive, preparation method thereof and termination adhesive tape |
| CN110970680A (en) * | 2018-09-28 | 2020-04-07 | 有量科技股份有限公司 | Method for disassembling battery core |
| CN110429346A (en) * | 2019-07-23 | 2019-11-08 | 天津池源科技有限公司 | A kind of lithium battery packaging technology |
| KR102659188B1 (en) * | 2020-07-31 | 2024-04-18 | 한화이센셜 주식회사 | Adhesive composition for battery modules and outer cover film for battery modules comprising the same |
| CN111952527B (en) * | 2020-08-13 | 2022-12-27 | 梅州市量能新能源科技有限公司 | Packaging method and packaging equipment for flexible package lithium battery |
| CN116676054A (en) * | 2023-04-11 | 2023-09-01 | 江苏荣骐光电材料科技有限公司 | Preparation method of UV (ultraviolet) curing type lithium battery shell protection adhesive tape |
| CN118085760A (en) * | 2024-04-28 | 2024-05-28 | 泰兴联创绝缘材料有限公司 | Single-body insulating flame-retardant protective film for battery cells of power battery and preparation method thereof |
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| CN102108268B (en) * | 2011-01-11 | 2013-04-17 | 太仓金煜电子材料有限公司 | Environment-friendly halogen-free inflaming retarding adhesive tape and production process thereof |
| US20130078463A1 (en) * | 2011-09-22 | 2013-03-28 | Nitto Denko Corporation | Acrylic pressure-sensitive adhesive composition, acrylic pressure-sensitive adhesive layer, and acrylic pressure-sensitive adhesive tape |
| CN103911088B (en) * | 2014-04-23 | 2015-10-28 | 深圳市美信电子有限公司 | A kind of acrylate pressure-sensitive adhesive band and preparation method thereof and lithium ion battery |
| CN105280957B (en) * | 2015-09-23 | 2017-06-30 | 东营黄蓝知识产权运营管理有限公司 | A kind of power lithium battery automatic production line and its production technology |
| CN105885753A (en) * | 2016-04-25 | 2016-08-24 | 何凤英 | Insulation glue for lithium metal batteries and preparation method thereof |
| CN106207087B (en) * | 2016-08-25 | 2021-06-22 | 安普瑞斯（南京）有限公司 | Lithium ion battery |
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