CN106905884B - Laminating process of lithium battery termination adhesive tape - Google Patents
Laminating process of lithium battery termination adhesive tape Download PDFInfo
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- CN106905884B CN106905884B CN201710137960.6A CN201710137960A CN106905884B CN 106905884 B CN106905884 B CN 106905884B CN 201710137960 A CN201710137960 A CN 201710137960A CN 106905884 B CN106905884 B CN 106905884B
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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
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- 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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- 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
- C09J7/21—Paper; Textile fabrics
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- 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
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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
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- 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
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- 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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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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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- 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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Abstract
The invention relates to the technical field of lithium battery assembly, in particular to a bonding process of a lithium battery termination adhesive tape, 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper base material. According to the invention, the flame-retardant termination adhesive tape with flame retardance is used for replacing the traditional termination adhesive tape, so that the flame-retardant property of the lithium battery is improved, and the safety performance of the soft package lithium battery is improved.
Description
Technical Field
The invention relates to the technical field of lithium battery assembly, in particular to a bonding process of a lithium battery termination adhesive tape.
Background
The lithium battery has the advantages of no pollution, high capacity, long cycle life and the like, is an important energy product, but the battery explosion of the Samsung note7 also alerts consumers and manufacturers, and the safety performance of the lithium battery cannot be ignored.
The important part in the production of the lithium battery lies in that the adhesive tape is used for fixing, insulating and protecting the electric core, the lug and the termination part of the lithium battery, so that the safety performance of the lithium battery can be inevitably improved by adopting the flame-retardant termination adhesive tape, and the natural potential safety hazard of the battery is effectively prevented. However, the existing lithium battery termination adhesive tape is generally a common acrylic pressure-sensitive adhesive tape and does not have flame retardancy.
In addition, the termination adhesive tape needs to have further flame retardant performance and also needs to be capable of enduring long-term soaking of the electrolyte, so that the safety problems of battery performance reduction caused by pollution of dissolved impurities to the electrolyte and electrolyte leakage or electrode direct contact short circuit caused by loss of viscosity under corrosion of the electrolyte, spontaneous combustion and the like are avoided.
Disclosure of Invention
The invention aims to provide a bonding process of a lithium battery termination adhesive tape for improving the safety performance of a lithium battery aiming at the defects in the prior art.
The purpose of the invention is realized by the following technical scheme:
a laminating process of a lithium battery termination adhesive tape comprises the following steps of (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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 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.
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 composition ratio of 1 can improve the bonding capability and the holding capability of the termination tape in the electrolyte more than the single cross-linking agent.
Further, the weight ratio of the crosslinking agent to the dodecyl mercaptan is 10: 1. the crosslinking agent and the dodecyl mercaptan supplement each other to adjust the cohesive force and the viscosity of the acrylic copolymer, and the weight ratio of the crosslinking agent to the 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 adhesive tape, because in addition to the improvement of the flame retardant performance, whether the flame retardant is easy to precipitate in the acrylic copolymer to pollute the electrolyte needs to be considered, and whether the adopted flame retardant is easy to agglomerate to reduce the viscosity of the 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 adhesive holding capacity of the termination adhesive tape can be improved.
The organic solvent is at least one of toluene, xylene and ethyl acetate. Preferably ethyl acetate.
The flame-retardant termination adhesive tape is prepared by the following method: mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, dodecyl mercaptan, a flame retardant and 50-70% 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 acid adhesive, and coating the flame-retardant acrylic acid adhesive on a DuPont paper substrate to obtain the flame-retardant termination adhesive tape.
The invention has the beneficial effects that: 1. according to the invention, the flame-retardant termination adhesive tape with flame retardance is used for replacing the traditional termination adhesive tape, so that the flame-retardant property of the lithium battery is improved, and the safety performance of the soft package lithium battery is improved; 2. according to the invention, the formula of the flame-retardant termination adhesive tape is combined and improved, so that the bonding property and the electrolyte corrosion resistance of the flame-retardant termination adhesive tape are improved.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
A bonding process of a lithium battery termination adhesive tape 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 termination adhesive tape comprises the following steps: the flame-retardant termination adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, 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 to obtain the flame-retardant termination adhesive tape.
Example 2
A bonding process of a lithium battery termination adhesive tape 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 termination adhesive tape comprises the following steps: the flame-retardant termination adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, 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 to obtain the flame-retardant termination adhesive tape.
Example 3
A bonding process of a lithium battery termination adhesive tape 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 termination adhesive tape comprises the following steps: the flame-retardant termination adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, 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 to obtain the flame-retardant termination adhesive tape.
Example 4
A bonding process of a lithium battery termination adhesive tape 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 termination adhesive tape comprises the following steps: the flame-retardant termination adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, 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 to obtain the flame-retardant termination adhesive tape.
Example 5
A bonding process of a lithium battery termination adhesive tape 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 termination adhesive tape comprises the following steps: the flame-retardant termination adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, 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 to obtain the flame-retardant termination adhesive tape.
Example 6
A bonding process of a lithium battery termination adhesive tape 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 termination adhesive tape comprises the following steps: the flame-retardant termination adhesive tape is prepared by mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, 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 a PET (polyethylene terephthalate) substrate.
The flame retardant termination tapes of examples 1-6 were tested for performance. The test indexes and corresponding test conditions are as follows:
and (1) conventional adhesive force. The test method is as follows: the testing temperature is 23 +/-2 ℃, the relative humidity is 60-70%, the flame-retardant termination adhesive tape with the width of 20mm is lightly pressed by fingers to be attached to a clean aluminum plate, the adhesive tape is pressed back for 3 times at the speed of 10m/min by a 2Kg pressure roller, the flame-retardant termination adhesive tape is placed for 20min or 24h, then the flame-retardant termination adhesive tape is stripped at the stripping speed of 300m/min and the stripping angle of 180 degrees, the stripping force is recorded, and the average value is calculated.
Adhesion of electrolyte. The test method is as follows: the testing temperature is 23 +/-2 ℃, the relative humidity is 60-70%, the flame-retardant termination adhesive tape with the width of 20mm is lightly pressed by fingers to stick the adhesive tape on a clean aluminum plate, a 2Kg compression roller is used for back pressing for 3 times at the speed of 10m/min, the aluminum plate is placed for 24 hours, the aluminum plate is soaked in the electrolyte for 10 minutes, then the flame-retardant termination adhesive tape is stripped at the stripping speed of 300m/min and at the stripping angle of 180 degrees, the stripping force is recorded, and the average value is calculated.
Conventional retention. The test method is as follows: the testing temperature is 23 +/-2 ℃, the relative humidity is 60-70%, the flame-retardant termination adhesive tape is attached to a clean aluminum plate by slight finger pressure, the attachment area is 20mmX20mm, the adhesive tape is pressed back for 3 times at the speed of 10m/min by a 2Kg pressure roller, the aluminum plate is placed for 20min, the aluminum plate is vertical, a 1Kg weight is hung at the lowest end of the flame-retardant termination adhesive tape, the weight is loaded for 1h, and the falling distance of the weight is recorded.
And fourthly, electrolyte retention. The test method is as follows: the testing temperature is 23 +/-2 ℃, the relative humidity is 60-70%, the flame-retardant termination adhesive tape is slightly pressed by fingers to be attached to a clean aluminum plate, the attaching area is 20mmX20mm, the adhesive tape is pressed back for 3 times at the speed of 10m/min by a 2Kg pressure roller, the aluminum plate is placed for 20min, the aluminum plate is soaked in the electrolyte for 10min, the aluminum plate is vertical, the lowest end of the flame-retardant termination adhesive tape is hung with a 1Kg weight, the weight is loaded for 1h, and the falling distance of the weight is recorded.
And fifthly, flame retardance. Conventional flame retardant rating test methods.
It can be seen from the above table that the fire-retardant termination adhesive 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. Moreover, observation shows that after the electrolyte is soaked, the electrolyte and the flame-retardant stopping adhesive tape have no surface color, so that the flame-retardant stopping adhesive tape does not release colored impurities in the soaking process, and basically has no difference when the electrolyte is subjected to charge and discharge performance tests, which indicates that the flame-retardant stopping adhesive tape adopted by the application can not influence the performance of the electrolyte.
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 laminating process of the lithium battery termination adhesive tape is characterized in that: 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) attaching a flame-retardant termination adhesive tape at the corresponding position of the battery cell; (3) assembling: assembling the battery core, then injecting electrolyte, exhausting air and sealing to obtain a lithium battery; the flame-retardant termination adhesive tape comprises a DuPont paper base material and a flame-retardant acrylic adhesive layer coated on the DuPont paper 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 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 method of the flame-retardant termination adhesive tape comprises the following steps: mixing isooctyl acrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, lauryl acrylate, butyl acrylate, an initiator, a cross-linking agent, dodecyl mercaptan, a flame retardant and 50-70% 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 acid adhesive, and coating the flame-retardant acrylic acid adhesive on a DuPont paper substrate to obtain the flame-retardant termination adhesive tape.
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| CN108384465A (en) * | 2018-03-30 | 2018-08-10 | 追诚新能源材料（江苏）有限公司 | A kind of high temperature resistance lithium battery insulating tape |
| CN108728009A (en) * | 2018-04-28 | 2018-11-02 | 浙江福莱新材料股份有限公司 | A kind of anti-reflection antireflective cold lamination film and preparation method thereof |
| CN108728008A (en) * | 2018-04-28 | 2018-11-02 | 浙江福莱新材料股份有限公司 | A kind of antireflective cold lamination film and preparation method thereof |
| CN109370488B (en) * | 2018-10-14 | 2020-12-15 | 佛山市顺德区永创翔亿电子材料有限公司 | Special anti-warping adhesive for lithium battery, preparation method and anti-warping tab adhesive tape |
| CN109705748A (en) * | 2018-12-27 | 2019-05-03 | 东莞市澳中电子材料有限公司 | A kind of attaching process of lithium battery terminal adhesive tape |
| 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 |
| CN113717652A (en) * | 2021-08-30 | 2021-11-30 | 武汉安托万拉瓦锡电池有限公司 | Lithium battery roll core fixing adhesive with molecular-level flame-retardant function |
| CN114094048A (en) * | 2021-11-23 | 2022-02-25 | 珠海冠宇电池股份有限公司 | Battery with improved battery capacity |
| CN114094105A (en) * | 2021-11-23 | 2022-02-25 | 珠海冠宇电池股份有限公司 | Battery with improved battery capacity |
| CN115651557A (en) * | 2022-10-31 | 2023-01-31 | 惠州锂威新能源科技有限公司 | Safety adhesive paper, preparation method thereof and lithium battery |
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| CN104946160B (en) * | 2014-03-31 | 2019-09-13 | 日东电工（上海松江）有限公司 | Adhesive composition and 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 |
| CN105355956B (en) * | 2015-10-16 | 2018-01-19 | 广东烛光新能源科技有限公司 | Electrochemical cell and preparation method thereof |
| CN105885753A (en) * | 2016-04-25 | 2016-08-24 | 何凤英 | Insulation glue for lithium metal batteries and preparation method thereof |
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