Adhesive composition and preparation method therefor, battery pack, and electric device

Abstract

The present application provides an adhesive composition and a preparation method therefor, a battery pack, and an electric device. In particular, the present disclosure provides an adhesive composition, comprising a first component and a second component, wherein the first component comprises a polyol polymer and a polyamine polymer, and the second component comprises an isocyanate compound.

Description

Adhesive composition, preparation method thereof, battery pack and electrical device

[0001] Cross-references

[0002] This application refers to Chinese patent application No. 202311493731.X filed on November 9, 2023, entitled “Adhesive composition, preparation method thereof, battery pack and electrical device”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of adhesive technology, and in particular to an adhesive composition, a preparation method thereof, a battery pack, and an electrical device. Background Art

[0004] Battery packs are used to meet the high power and energy density requirements of electric vehicles. The actual production of battery packs requires multiple assembly steps, including the use of adhesives to bond the components. However, improper assembly, bumps, and scratches are common, necessitating the disassembly of bonded components for rework.

[0005] Therefore, it is necessary to provide an adhesive that is easy to rework during the production process of the battery pack.

[0006] Summary of the Invention

[0007] The present application is made in view of the above-mentioned problems, and its purpose is to provide an adhesive composition that is easy to rework during the production process of a battery pack, a preparation method thereof, and a corresponding battery pack and electrical device.

[0008] The inventors have discovered that the above objectives can be achieved by adopting the technical solution of the present application.

[0009] A first aspect of the present application provides an adhesive composition, which comprises a first component and a second component, wherein the first component comprises a polyol polymer and a polyamine polymer, and the second component comprises an isocyanate compound.

[0010] The adhesive composition of the present application facilitates rework during the production of the battery pack within 4 hours at room temperature and low temperature; and after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0011] In any embodiment, (hydroxyl value of polyol polymer x weight of polyol polymer) / (amine value of polyamine polymer x weight of polyamine polymer) is in the range of 0.1-10, preferably in the range of 0.4-1.2.

[0012] When (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.1-10, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0013] When (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.4-1.2, the adhesive composition of the present application enables the components of the battery pack that have passed quality inspection to be further more firmly bonded together after 7 days at room temperature and low temperature.

[0014] In any embodiment, the ratio of the isocyanate equivalent weight of the second component to the sum of the hydroxyl equivalent weight of the first component and the active hydrogen equivalent weight of the first component is in the range of 0.4-2.

[0015] When the ratio of the isocyanate equivalent of the second component to the sum of the hydroxyl equivalent of the first component and the active hydrogen equivalent of the first component is in the range of 0.4-2, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0016] In any embodiment, the isocyanate compound includes isocyanate and / or isocyanate prepolymer.

[0017] When the isocyanate compound includes isocyanate and / or isocyanate prepolymer, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0018] In any embodiment, the polyol polymer includes one or more of polyester polyol, polyether polyol, polyolefin polyol, and vegetable oil polyol.

[0019] When the polyol polymer includes one or more of polyester polyols, polyether polyols, polyolefin polyols, and vegetable oil polyols, the adhesive composition of the present application facilitates rework during the production of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0020] In any embodiment, the polyester polyol includes one or more of polycarbonate diol, polycaprolactone diol, polycaprolactone triol, polyethylene adipate diol, polypropylene adipate diol, polybutylene adipate-1,4-diol, polydiethylene adipate diol, polyethylene phthalate, polyhexane-1,6-diol phthalate diol, and polyneopentyl phthalate diol.

[0021] When the polyester polyol includes one or more of polycarbonate diol, polycaprolactone diol, polycaprolactone triol, polyethylene adipate diol, polypropylene adipate diol, polybutylene adipate diol, polyethylene adipate ether diol, polyethylene phthalate ether diol, polyhexane-1,6-phthalate diol, and polyneopentyl phthalate diol, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0022] In any embodiment, the polyether polyol includes one or more of polyethylene oxide diol, polypropylene oxide diol, polypropylene oxide triol, polypropylene oxide tetraol, polytetramethylene glycol, tetramethylene oxide copolymer glycol, tetramethylene oxide copolymer glycol, and ethylene oxide copolymer glycol.

[0023] When the polyether polyol includes one or more of polyethylene glycol, polypropylene glycol, polypropylene glycol triol, polypropylene glycol tetraol, polytetramethylene glycol, tetramethylene glycol-ethylene oxide copolymer, tetramethylene glycol-propylene oxide copolymer, and ethylene oxide-propylene oxide copolymer, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0024] In any embodiment, the polyolefin polyol includes one or more of hydroxyl-terminated polybutadiene, hydroxyl-terminated epoxidized polybutadiene, hydroxyl-terminated polybutadiene-acrylonitrile copolymer, and polystyrene polyethylene glycol.

[0025] When the polyolefin polyol includes one or more of terminal hydroxyl polybutadiene, terminal hydroxyl epoxidized polybutadiene, terminal hydroxyl polybutadiene-acrylonitrile copolymer, and polystyrene polyethylene glycol, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0026] In any embodiment, the vegetable oil polyol includes one or more of castor oil polyol, soybean oil polyol, and palm oil polyol.

[0027] When the vegetable oil polyol includes one or more of castor oil polyol, soybean oil polyol, and palm oil polyol, the adhesive composition of the present application facilitates rework during the production of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0028] In any embodiment, the polyamine polymer includes one or more of polytetramethylene ether glycol bis-p-aminobenzoate, diamino-terminated polyoxypropylene ether, triamino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, polyaspartic acid ester, benzothiazole-modified polyaspartic acid ester, amino-terminated polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, and aromatic diethyltoluene diprimary amine.

[0029] When the polyamine polymer includes one or more of polytetramethylene ether glycol bis-p-aminobenzoate, diamino-terminated polyoxypropylene ether, ternary amino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, polyaspartic acid ester, benzothiazole-modified polyaspartic acid ester, amino-terminated polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, and aromatic diethyltoluene diprimary amine, the adhesive composition of the present application is easy to rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0030] In any embodiment, the isocyanate prepolymer includes one or more of hexamethylene diisocyanate prepolymer, polymethylene polyphenyl polyisocyanate prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate prepolymer, dimethoxyaniline isocyanate prepolymer, and alkylated phenylene diisocyanate prepolymer.

[0031] When the isocyanate prepolymer includes one or more of hexamethylene diisocyanate prepolymer, polymethylene polyphenyl polyisocyanate prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate prepolymer, dimethoxyaniline isocyanate prepolymer, and alkylated phenylene diisocyanate prepolymer, the adhesive composition of the present application is easy to rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0032] In any embodiment, the isocyanate includes one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxyaniline isocyanate, and alkylated phenylene diisocyanate.

[0033] When the isocyanate includes one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxyaniline isocyanate, and alkylated phenylene diisocyanate, the adhesive composition of the present application is easy to rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0034] In any embodiment, the first component further includes one or more of a chain extender, a first filler, and a first auxiliary agent.

[0035] When the first component also includes one or more of a chain extender, a first filler, and a first auxiliary agent, the adhesive composition of the present application facilitates rework during the production of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0036] When the first component also includes a first auxiliary agent, the adhesive composition of the present application can further quickly cure (within 1 minute, 4 hours) at room temperature and low temperature in the initial stage, thereby further improving production efficiency; after 7 days at room temperature and low temperature, the components of the battery pack that have passed quality inspection are further more firmly bonded together.

[0037] In any embodiment, the second component further includes one or more of a second filler and a second auxiliary agent.

[0038] When the second component also includes one or more of a second filler and a second auxiliary agent, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0039] In any embodiment, the chain extender includes one or more of a polyol chain extender and a polyamine chain extender.

[0040] When the chain extender includes one or more of a polyol chain extender and a polyamine chain extender, the adhesive composition of the present application facilitates rework during the production of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0041] In any embodiment, the polyol chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, tetraethylene glycol, 1,2-propylene glycol, methylpropylene glycol, neopentyl glycol, trimethylolpropane, trimethylolethane, pentaerythritol, xylitol, sorbitol, glycerol, and diethylaminoethanol.

[0042] When the polyol chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, tetraethylene glycol, 1,2-propylene glycol, methylpropylene glycol, neopentyl glycol, trimethylolpropane, trimethylolethane, pentaerythritol, xylitol, sorbitol, glycerol, and diethylaminoethanol, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0043] In any embodiment, the polyamine chain extender includes one or more of diethyltoluenediamine, dimethylthiotoluenediamine, N,N'-dialkylmethyldiamine, diaminodiphenylmethane, isophoronediamine, methyldiethanolamine, diacetylethylenediamine, dialkyltoluenediamine, 1,4-bis-sec-butylaminobenzene, bis-sec-butylaminodiphenylmethane, N,N'-bis-pentylcyclohexanediamine, and methyldiethanolamine.

[0044] When the polyamine chain extender includes one or more of diethyltoluenediamine, dimethylthiotoluenediamine, N,N'-dialkylmethyldiamine, diaminodiphenylmethane, isophoronediamine, methyldiethanolamine, diacetylethylenediamine, dialkyltoluenediamine, 1,4-bis-sec-butylaminobenzene, bis-sec-butylaminodiphenylmethane, N,N'-bis-swollenpentylcyclohexanediamine, and methyldiethanolamine, the adhesive composition of the present application is easy to rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0045] In any embodiment, the first filler and the second filler independently include one or more of aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium carbonate, talc, silicon dioxide, glass beads, diatomaceous earth, kaolin, silica powder, titanium dioxide, carbon powder, phthalocyanine blue, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, zinc oxide, magnesium oxide, and cerium oxide.

[0046] When the first filler and the second filler independently include one or more of aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium carbonate, talc, silicon dioxide, glass beads, diatomaceous earth, kaolin, silica powder, titanium dioxide, carbon powder, phthalocyanine blue, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, zinc oxide, magnesium oxide, and cerium oxide, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0047] In any embodiment, the first auxiliary agent and the second auxiliary agent independently include one or more of a leveling agent, a defoaming agent, a thixotropic agent, a wetting agent, a catalyst, an antioxidant, an anti-ultraviolet agent, a plasticizer, a slip agent, and an anti-blocking agent.

[0048] When the first auxiliary agent and the second auxiliary agent independently include one or more of a leveling agent, a defoaming agent, a thixotropic agent, a wetting agent, a catalyst, an antioxidant, an anti-ultraviolet agent, a plasticizer, a slip agent, and an anti-blocking agent, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0049] In any embodiment, the first component comprises

[0050] Polyol polymer: 10-70 parts by weight

[0051] Polyamine polymer: 5-65 parts by weight,

[0052] Chain extender: 0-5 parts by weight,

[0053] First filler: 0-20 parts by weight, and

[0054] The first auxiliary agent: 0-1 parts by weight, and

[0055] The second component contains

[0056] Isocyanate and / or isocyanate prepolymer: 80 parts by weight,

[0057] Second filler: 0-20 parts by weight, and

[0058] Second auxiliary agent: 0-1 parts by weight.

[0059] When the first component contains the above-mentioned parts by weight of polyol polymer, polyamine polymer, chain extender, first filler, and first auxiliary agent, and the second component contains the above-mentioned parts by weight of isocyanate and / or isocyanate prepolymer, second filler, and second auxiliary agent, the adhesive composition of the present application facilitates rework during the production process of the battery pack within 4 hours at room temperature or low temperature; after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0060] The second aspect of the present application further provides a method for preparing the adhesive composition according to the first aspect of the present application, the method comprising the following steps:

[0061] (1) mixing a polyol polymer, a polyamine polymer, an optional chain extender, an optional first filler, and an optional first auxiliary agent to obtain a first component; and

[0062] (2) preparing an isocyanate compound and mixing it with an optional second filler and an optional second auxiliary agent to obtain a second component.

[0063] Therefore, the adhesive composition prepared by the method facilitates rework during the production process of the battery pack within 4 hours at room temperature and low temperature; and after 7 days at room temperature, the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0064] The third aspect of the present application provides a battery pack, which includes the adhesive composition according to the first aspect of the present application or the adhesive composition prepared by the method according to the second aspect of the present application.

[0065] A fourth aspect of the present application provides an electrical device comprising the battery pack according to the third aspect of the present application. DETAILED DESCRIPTION

[0066] The following detailed description specifically discloses the embodiments of the adhesive composition and preparation method thereof, battery pack, and electrical device of the present application. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there may be cases where detailed descriptions of well-known matters and repeated descriptions of actually the same structure are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter described in the claims.

[0067] " range " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be to include end value or not include end value, and can be arbitrarily combined, that is, any lower limit can form a range with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for specific parameters, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 are listed, and if the maximum range value 3,4 and 5 are listed, then the following range can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise specified, the numerical range " ab " represents the abbreviation of any real number combination between a and b, wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0068] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0069] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0070] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0071] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0072] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0073] The actual production of battery packs requires multiple steps to complete assembly, including the use of adhesives to bond the components. However, due to frequent problems such as improper assembly and scratches, the bonded components need to be disassembled for rework. Therefore, there is a need for an adhesive that facilitates rework during battery pack production.

[0074] Based on this, this application proposes a technical solution to solve the above technical problems.

[0075] A first aspect of the present application provides an adhesive composition, comprising a first component and a second component, wherein the first component comprises a polyol polymer and a polyamine polymer, and the second component comprises an isocyanate compound.

[0076] As used herein, the term "adhesive composition" includes a combination of a first component and a second component, wherein the first component and the second component are physically isolated (not in physical contact) before use and are mixed at the time of use.

[0077] As used herein, the term "polyol" refers to a class of alcohols having at least two hydroxyl groups.

[0078] As used herein, the term "polyol polymer" refers to a macromolecular compound formed by connecting multiple polyol monomer molecules through chemical bonds.

[0079] As used herein, the term "polyamine" refers to a class of amines having at least two amino groups.

[0080] As used herein, the term "polyamine polymer" refers to a macromolecular compound formed by connecting multiple polyamine monomer molecules through chemical bonds.

[0081] In this article, the term "chain extender" is also called chain growth agent, which refers to a substance that can react with functional groups on the chain of a linear polymer compound to extend its molecular chain.

[0082] As used herein, the term "isocyanate compounds" refers to a general term for various esters containing an isocyanate group (NCO), including isocyanates and isocyanate prepolymers.

[0083] As used herein, the term "isocyanate" refers to an isocyanate monomer containing one or more isocyanate groups.

[0084] As used herein, the term "isocyanate prepolymer" refers to a macromolecular compound formed by the reaction of an isocyanate monomer containing at least two isocyanate groups with a polyol.

[0085] Polyamine polymers and polyol polymers are the primary resins for isocyanate reactions, and their reaction rates differ significantly. The primary or secondary amine groups in polyamine polymers react with isocyanate groups in a nucleophilic addition reaction, rapidly forming allophanate bonds at both room and low temperatures. In contrast, the reaction between the hydroxyl groups in polyol polymers and isocyanate groups is a secondary reaction, reacting more slowly at both room and low temperatures, ultimately forming urethane bonds. Both reactions can crosslink and cure the adhesive, enhancing bond strength.

[0086] The reaction formulas for the primary amine group, the secondary amine group and the isocyanate group in the polyamine polymer to form the allophanate bond are as follows:

[0087] The reaction formula for the reaction of hydroxyl groups in polyol polymers with isocyanate groups to form urethane bonds is as follows:

[0088] When the first component contains a polyol polymer but not a polyamine polymer, sufficient bond strength (tensile and shear strength) cannot be achieved. On the one hand, the adhesive's cohesive strength is insufficient due to a low degree of crosslinking, and on the other hand, the adhesive cannot form an effective chemical bond with the substrate. When the first component contains a polyamine polymer but not a polyol polymer, the initial rapid reaction leads to excessive shrinkage stress in the adhesive, preventing it from forming close contact with the substrate, resulting in a decrease in subsequent bond strength (tensile and shear strength).

[0089] By rationally matching the polyamine polymer, the polyol polymer and the isocyanate compound, the obtained adhesive composition allows for easy disassembly and rework within a certain period of time, while achieving firm bonding after exceeding a specific period of time.

[0090] The adhesive composition of this application exhibits adequate tensile strength within four hours at both room and low temperatures, facilitating rework during battery pack production. Furthermore, after seven days at room temperature, the adhesive composition of this application exhibits high tensile and shear strengths, ensuring a more secure bonding of the components of battery packs that have passed quality inspection.

[0091] In this article, the term "normal temperature" refers to about 25°C.

[0092] In this context, the term "low temperature" refers to about 4°C.

[0093] In this article, the term "tensile strength" refers to the maximum stress a material can withstand before breaking, measured according to GBT 6329. Tensile strength is closely related to whether a material can be disassembled and reworked.

[0094] In this article, the term "shear strength" refers to the shear stress in a single lap joint of rigid materials measured when a tensile force is applied parallel to the bond surface and in the direction of the specimen's principal axis. It is measured according to GBT 7124. Both shear strength and tensile strength are related to the strength of the bond.

[0095] In some embodiments, (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.1-10, preferably in the range of 0.4-1.2. In some embodiments, (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.10-9.01, preferably in the range of 0.43-1.12.

[0096] As used herein, the term "hydroxyl value" refers to the number of milligrams of potassium hydroxide (KOH) equivalent to the hydroxyl groups in 1 gram of sample, expressed as mg KOH / g. The hydroxyl value is determined as described in GB / T 12008.3-1989.

[0097] As used herein, the term "amine value" refers to the amount of potassium hydroxide (KOH) equivalent to the amount of acid required to neutralize 1 gram of an amine compound, expressed as mg KOH / g. The amine value is determined as described in GB / T 6365-2006.

[0098] When (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.1-10, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0099] When (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.4-1.2, the adhesive composition of the present application has further higher tensile strength and shear strength after 7 days at room temperature and low temperature, so that the components of the battery pack that have passed quality inspection are further more firmly bonded together.

[0100] In some embodiments, the ratio of the isocyanate equivalent weight of the second component to the sum of the hydroxyl equivalent weight of the first component and the active hydrogen equivalent weight of the first component is in the range of 0.4 to 2. In some embodiments, the ratio of the isocyanate equivalent weight of the second component to the sum of the hydroxyl equivalent weight of the first component and the active hydrogen equivalent weight of the first component is in the range of 0.46 to 1.81.

[0101] As used herein, the term "isocyanate equivalent weight (NCO equivalent weight)" refers to the number of moles of isocyanate groups per gram of an isocyanate compound.

[0102] As used herein, the term "hydroxyl equivalent weight" refers to the mass of a resin containing 1 mol of hydroxyl groups.

[0103] As used herein, the term "active hydrogen equivalent" refers to the mass of the resin containing 1 mol of amino groups.

[0104] For example, in Example 1,

[0105] NCO equivalent weight of the second component = (NCO equivalent weight of the isocyanate prepolymer × parts by weight of the isocyanate prepolymer + NCO equivalent weight of the isocyanate × parts by weight of the isocyanate) / total parts by weight of the second component = (488 × 60 + 125 × 20) / 100 = 317.8

[0106] Hydroxyl equivalent of the first component = (hydroxyl equivalent of the polyol polymer × parts by weight of the polyol polymer + hydroxyl equivalent of the chain extender × parts by weight of the chain extender) / total parts by weight of the first component = (510 × 40 + 45 × 5) / 100 = 359.25

[0107] Active hydrogen equivalent of the first component = (active hydrogen equivalent of the polyamine polymer × parts by weight of the polyamine polymer) / total parts by weight of the first component = (514 × 5) / 100 = 25.7.

[0108] As another example, in Example 30,

[0109] Isocyanate NCO equivalent weight of the second component = (NCO equivalent weight of isocyanate prepolymer × parts by weight of isocyanate prepolymer + NCO equivalent weight of isocyanate × parts by weight of isocyanate) / total parts by weight of the second component = (488 × 60 + 125 × 20) / 100 = 317.8

[0110] Hydroxyl equivalent weight of the first component = (hydroxyl equivalent weight of the polyol polymer × parts by weight of the polyol polymer) / total parts by weight of the first component = (510 × 40) / 100 = 204

[0111] The active hydrogen equivalent of the amine group of the first component = (active hydrogen equivalent of the polyamine polymer × weight of the polyamine polymer + active hydrogen equivalent of the chain extender × weight of the chain extender) / total weight of the first component = (514 × 35 + 85 × 5) / 100 = 184.15.

[0112] In this document, the term "NCO content" refers to the mass of isocyanate groups contained in 100 g of a sample. The NCO content is determined as described in GB / T 12009.4.

[0113] When the ratio of the isocyanate equivalent of the second component to the sum of the hydroxyl equivalent of the first component and the active hydrogen equivalent of the first component is within the range of 0.4-2, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0114] In some embodiments, the isocyanate compound includes isocyanate and / or isocyanate prepolymer.

[0115] When the isocyanate compound includes isocyanate and / or isocyanate prepolymer, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0116] In some embodiments, the polyol polymer includes one or more of polyester polyol, polyether polyol, polyolefin polyol, and vegetable oil polyol.

[0117] When the polyol polymer includes one or more of polyester polyols, polyether polyols, polyolefin polyols, and vegetable oil polyols, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0118] In some embodiments, the polyester polyol includes one or more of polycarbonate diol, polycaprolactone diol, polycaprolactone triol, polyethylene adipate diol, polypropylene adipate diol, polybutylene adipate-1,4-diol, polydiethylene adipate diol, polyethylene phthalate, polyhexane-1,6-diol phthalate diol, and polyneopentyl phthalate diol.

[0119] When the polyester polyol includes one or more of polycarbonate diol, polycaprolactone diol, polycaprolactone triol, polyethylene adipate diol, polypropylene adipate diol, polybutylene adipate diol, polyethylene adipate ether diol, polyethylene phthalate ether diol, polyhexanediol 1,6-phthalate diol, and polyneopentyl phthalate diol, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0120] In some embodiments, the polyether polyol includes one or more of polyethylene oxide glycol, polypropylene oxide glycol, polypropylene oxide triol, polypropylene oxide tetraol, polytetramethylene glycol, tetramethylene oxide copolymer glycol, tetramethylene oxide copolymer glycol, and ethylene oxide copolymer glycol.

[0121] When the polyether polyol includes one or more of polyethylene glycol, polypropylene glycol, polypropylene glycol triol, polypropylene glycol tetraol, polytetramethylene glycol, tetramethylene glycol-ethylene oxide copolymer, tetramethylene glycol-propylene oxide copolymer, and polyethylene oxide-propylene oxide copolymer, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0122] In some embodiments, the polyolefin polyol includes one or more of hydroxyl-terminated polybutadiene, hydroxyl-terminated epoxidized polybutadiene, hydroxyl-terminated polybutadiene-acrylonitrile copolymer, and polystyrene polyethylene glycol.

[0123] When the polyolefin polyol includes one or more of terminal hydroxyl polybutadiene, terminal hydroxyl epoxidized polybutadiene, terminal hydroxyl polybutadiene-acrylonitrile copolymer, and polystyrene polyethylene glycol, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0124] In some embodiments, the vegetable oil polyol includes one or more of castor oil polyol, soybean oil polyol, and palm oil polyol.

[0125] When the vegetable oil polyol includes one or more of castor oil polyol, soybean oil polyol, and palm oil polyol, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0126] In some embodiments, the polyamine polymer includes one or more of polytetramethylene ether glycol bis-p-aminobenzoate, diamino-terminated polyoxypropylene ether, triamino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, polyaspartic acid ester, benzothiazole-modified polyaspartic acid ester, amino-terminated polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, and aromatic diethyltoluene diprimary amine.

[0127] When the polyamine polymer includes one or more of polytetramethylene ether glycol bis-para-aminobenzoate, diamino-terminated polyoxypropylene ether, ternary amino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, polyaspartic acid ester, benzothiazole-modified polyaspartic acid ester, amino-terminated polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, and aromatic diethyltoluene diprimary amine, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0128] In some embodiments, the isocyanate prepolymer includes one or more of hexamethylene diisocyanate prepolymer, polymethylene polyphenyl polyisocyanate prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate prepolymer, dimethoxyaniline isocyanate prepolymer, and alkylated phenylene diisocyanate prepolymer.

[0129] When the isocyanate prepolymer includes one or more of hexamethylene diisocyanate prepolymer, polymethylene polyphenyl polyisocyanate prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate prepolymer, dimethoxyaniline isocyanate prepolymer, and alkylated phenylene diisocyanate prepolymer, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0130] In some embodiments, the isocyanate includes one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxyaniline isocyanate, and alkylated phenylene diisocyanate.

[0131] When the isocyanate includes one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxyaniline isocyanate, and alkylated phenylene diisocyanate, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0132] In some embodiments, the first component further includes one or more of a chain extender, a first filler, and a first auxiliary agent.

[0133] When the first component also includes one or more of a chain extender, a first filler, and a first auxiliary agent, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0134] When the first component also includes a first auxiliary agent, the adhesive composition of the present application can further quickly cure at room temperature and low temperature in the initial stage (within 1 minute, 4 hours), so that a certain bonding force (tensile strength) is formed between the components, further shortening the time for the next process, thereby further improving production efficiency; in addition, the adhesive composition of the present application has further higher tensile strength and shear strength after 7 days at room temperature and low temperature, so that the components of the battery pack that have passed quality inspection are further more firmly bonded together.

[0135] In some embodiments, the second component further includes one or more of a second filler and a second auxiliary agent.

[0136] When the second component also includes one or more of a second filler and a second auxiliary agent, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0137] In some embodiments, the chain extender includes one or more of a polyol chain extender and a polyamine chain extender.

[0138] When the chain extender includes one or more of a polyol chain extender and a polyamine chain extender, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0139] In some embodiments, the polyol chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, tetraethylene glycol, 1,2-propylene glycol, methylpropylene glycol, neopentyl glycol, trimethylolpropane, trimethylolethane, pentaerythritol, xylitol, sorbitol, glycerol, and diethylaminoethanol.

[0140] When the polyol chain extender includes one or more of 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, tetraethylene glycol, 1,2-propylene glycol, methylpropylene glycol, neopentyl glycol, trimethylolpropane, trimethylolethane, pentaerythritol, xylitol, sorbitol, glycerol, and diethylaminoethanol, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0141] In some embodiments, the polyamine chain extender includes one or more of diethyltoluenediamine, dimethylthiotoluenediamine, N,N'-dialkylmethyldiamine, diaminodiphenylmethane, isophoronediamine, methyldiethanolamine, diacetylethylenediamine, dialkyltoluenediamine, 1,4-bis-sec-butylaminobenzene, bis-sec-butylaminodiphenylmethane, N,N'-bis-pentylcyclohexanediamine, and methyldiethanolamine.

[0142] When the polyamine chain extender includes one or more of diethyltoluenediamine, dimethylthiotoluenediamine, N,N'-dialkylmethyldiamine, diaminodiphenylmethane, isophoronediamine, methyldiethanolamine, diacetylethylenediamine, dialkyltoluenediamine, 1,4-bis-sec-butylaminobenzene, bis-sec-butylaminodiphenylmethane, N,N'-bis-pentylcyclohexanediamine, and methyldiethanolamine, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0143] In some embodiments, the first filler and the second filler independently include one or more of aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium carbonate, talc, silicon dioxide, glass beads, diatomaceous earth, kaolin, silica powder, titanium dioxide, carbon powder, phthalocyanine blue, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, zinc oxide, magnesium oxide, and cerium oxide.

[0144] When the first filler and the second filler independently include one or more of aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium carbonate, talc, silicon dioxide, glass beads, diatomaceous earth, kaolin, silicon powder, titanium dioxide, carbon powder, phthalocyanine blue, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, zinc oxide, magnesium oxide, and cerium oxide, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0145] In some embodiments, the first auxiliary agent and the second auxiliary agent independently include one or more of a leveling agent, a defoaming agent, a thixotropic agent, a wetting agent, a catalyst, an antioxidant, an anti-ultraviolet agent, a plasticizer, a slip agent, and an anti-blocking agent.

[0146] When the first auxiliary agent and the second auxiliary agent independently include one or more of a leveling agent, a defoaming agent, a thixotropic agent, a wetting agent, a catalyst, an antioxidant, an anti-ultraviolet agent, a plasticizer, a slip agent, and an anti-blocking agent, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0147] In some embodiments, the first component comprises

[0148] Polyol polymer: 10-70 parts by weight

[0149] Polyamine polymer: 5-65 parts by weight,

[0150] Chain extender: 0-5 parts by weight,

[0151] First filler: 0-20 parts by weight, and

[0152] The first auxiliary agent: 0-1 parts by weight, and

[0153] The second component contains

[0154] Isocyanate and / or isocyanate prepolymer: 80 parts by weight,

[0155] Second filler: 0-20 parts by weight, and

[0156] Second auxiliary agent: 0-1 parts by weight.

[0157] When the first component contains the above-mentioned parts by weight of the polyol polymer, the polyamine polymer, the chain extender, the first filler, and the first auxiliary agent, and the second component contains the above-mentioned parts by weight of the isocyanate, the isocyanate prepolymer, the second filler, and the second auxiliary agent, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, so that rework is convenient during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed the quality inspection are more firmly bonded together.

[0158] The second aspect of the present application further provides a method for preparing the adhesive composition according to the first aspect of the present application, the method comprising the following steps:

[0159] (1) mixing the polyol polymer, the polyamine polymer, the optional chain extender, the optional first filler, and the optional first auxiliary agent to obtain the first component; and

[0160] (2) preparing the isocyanate compound and mixing it with an optional second filler and an optional second auxiliary agent to obtain the second component.

[0161] Therefore, the adhesive composition prepared by the method has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0162] The third aspect of the present application provides a battery pack, which includes the adhesive composition as described in the first aspect of the present application or the adhesive composition prepared by the method as described in the second aspect of the present application.

[0163] A fourth aspect of the present application provides an electrical device comprising the battery pack as described in the third aspect of the present application.

[0164] In this article, the term "electrical device" may include mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc., but is not limited to these.

[0165] Example

[0166] Below, the embodiment of the present application is described. The embodiment described below is exemplary and is only used to explain the present application, and is not to be construed as limiting the present application. Where specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. Reagents or instruments used that do not specify the manufacturer are conventional products that can be obtained commercially.

[0167] Example 1

[0168] Preparation of the first component

[0169] Polyoxypropylene glycol (hydroxyl value of 110 mgKOH / g, hydroxyl equivalent of 510 g / mol) and 1,4-butanediol (hydroxyl value of 1246 mgKOH / g, hydroxyl equivalent of 45 g / mol) were added to the reactor in the parts by weight listed in Table 1. The reactor was heated to 100°C, evacuated to -0.08 MPa, and stirred for 2 hours. The temperature was then lowered to room temperature, and diamino-terminated polyoxypropylene ether (amine value of 171 mgKOH / g, active hydrogen equivalent of 514 g / mol) and magnesium hydroxide were added in the parts by weight listed in Table 1. The mixture was stirred under vacuum for 1 hour until uniform.

[0170] Preparation of the second component

[0171] Diphenylmethane diisocyanate prepolymer (NCO content of 8.6%, NCO equivalent of 488 g / mol) was added to the reactor according to the weight parts in Table 1, and the reactor was evacuated to -0.08 MPa. Diphenylmethane diisocyanate (NCO content of 33.6%, NCO equivalent of 125 g / mol) and magnesium hydroxide were added to the reactor in accordance with the weight parts in Table 1, and stirred under vacuum for 1 hour until the mixture was uniform.

[0172] Example 2-16

[0173] Prepare according to the method of Example 1 and adjust the corresponding material addition amounts according to Table 1.

[0174] Example 17

[0175] Preparation of the first component

[0176] Add polyoxypropylene glycol and 1,4-butanediol to a reactor in the parts by weight listed in Table 1. Heat the reactor to 100°C, evacuate to -0.08 MPa, and stir continuously for 2 hours. Then cool to room temperature. Add diamino-terminated polyoxypropylene ether, magnesium hydroxide, and silane coupling agent KH-560 in the parts by weight listed in Table 1. Stir continuously under vacuum for 1 hour until a uniform mixture is obtained.

[0177] Preparation of the second component

[0178] Exactly the same as Example 7.

[0179] Example 18

[0180] Preparation of the first component

[0181] Exactly the same as Example 7.

[0182] Preparation of the second component

[0183] Add diphenylmethane diisocyanate prepolymer according to the weight parts in Table 21 into the reactor, evacuate the reactor to -0.08 MPa, and then add magnesium hydroxide according to the weight parts in Table 1 into the reactor, and continue stirring under vacuum for 1 hour until it becomes uniform.

[0184] Example 19

[0185] Preparation of the first component

[0186] Exactly the same as Example 7.

[0187] Preparation of the second component

[0188] At room temperature, diphenylmethane diisocyanate and magnesium hydroxide were added into a reaction kettle according to the weight parts listed in Table 1, and stirred under vacuum for 1 hour until the mixture was uniform.

[0189] Example 20

[0190] Preparation of the first component

[0191] The only difference from Example 7 is that polycaprolactone diol (hydroxyl value of 56.1 mgKOH / g, hydroxyl equivalent weight of 1000 g / mol) is used instead of polyoxypropylene diol.

[0192] Preparation of the second component

[0193] Exactly the same as Example 7.

[0194] Example 21

[0195] Preparation of the first component

[0196] The only difference from Example 7 is that hydroxy-terminated polybutadiene (hydroxyl value of 48 mgKOH / g, hydroxyl equivalent weight of 1169 g / mol) is used instead of polyoxypropylene diol.

[0197] Preparation of the second component

[0198] Exactly the same as Example 7.

[0199] Example 22

[0200] Preparation of the first component

[0201] The only difference from Example 7 is that soybean oil-modified diol (hydroxyl value of 120 mgKOH / g, hydroxyl equivalent weight of 467 g / mol) is used instead of polyoxypropylene diol.

[0202] Preparation of the second component

[0203] Exactly the same as Example 7.

[0204] Example 23

[0205] Preparation of the first component

[0206] The only difference from Example 7 is that diamino-terminated polyoxyethylene ether (amine value of 171 mgKOH / g, active hydrogen equivalent of 575 g / mol) is used instead of diamino-terminated polyoxypropylene ether.

[0207] Preparation of the second component

[0208] Exactly the same as Example 7.

[0209] Example 24

[0210] Preparation of the first component

[0211] The only difference from Example 7 is that polytetramethylene ether glycol bis-p-aminobenzoate (amine value of 112 mgKOH / g, active hydrogen equivalent of 500 g / mol) is used instead of diamino-terminated polyoxypropylene ether.

[0212] Preparation of the second component

[0213] Exactly the same as Example 7.

[0214] Example 25

[0215] Preparation of the first component

[0216] Exactly the same as Example 7.

[0217] Preparation of the second component

[0218] The only difference from Example 7 is that hexamethylene diisocyanate (NCO content of 49.7%, NCO equivalent weight of 85 g / mol) is used instead of diphenylmethane diisocyanate.

[0219] Example 26

[0220] Preparation of the first component

[0221] Exactly the same as Example 7.

[0222] Preparation of the second component

[0223] The only difference from Example 7 is that toluene diisocyanate (NCO content of 48%, NCO equivalent weight of 88 g / mol) is used instead of diphenylmethane diisocyanate.

[0224] Example 27

[0225] Preparation of the first component

[0226] Exactly the same as Example 7.

[0227] Preparation of the second component

[0228] The only difference from Example 7 is that a hexamethylene diisocyanate prepolymer (NCO content of 22%, NCO equivalent weight of 191 g / mol) is used instead of the diphenylmethane diisocyanate prepolymer.

[0229] Example 28

[0230] Preparation of the first component

[0231] Exactly the same as Example 7.

[0232] Preparation of the second component

[0233] The only difference from Example 7 is that the diphenylmethane diisocyanate prepolymer is replaced by a toluene diisocyanate prepolymer (NCO content of 13.2%, NCO equivalent weight of 318 g / mol).

[0234] Example 29

[0235] Preparation of the first component

[0236] The only difference from Example 7 is that methylpropylene glycol (hydroxyl value of 1230 mgKOH / g, hydroxyl equivalent of 46 g / mol) is used instead of 1,4-butanediol.

[0237] Preparation of the second component

[0238] Exactly the same as Example 7.

[0239] Example 30

[0240] Preparation of the first component

[0241] The only difference from Example 7 is that isophorone diamine (amine value 458 mgKOH / g, active hydrogen equivalent 85 g / mol) is used instead of 1,4-butanediol.

[0242] Preparation of the second component

[0243] Exactly the same as Example 7.

[0244] Example 31

[0245] Preparation of the first component

[0246] The only difference from Example 7 is that aluminum hydroxide is used instead of magnesium hydroxide.

[0247] Preparation of the second component

[0248] The only difference from Example 7 is that aluminum hydroxide is used instead of magnesium hydroxide.

[0249] Comparative Example 1

[0250] Preparation of the first component

[0251] Add polyoxypropylene glycol and 1,4-butanediol to a reactor in the parts by weight listed in Table 1. Heat the reactor to 100°C, evacuate to -0.08 MPa, and stir continuously for 2 hours. Then cool to room temperature, add magnesium hydroxide in the parts by weight listed in Table 1, and stir continuously under vacuum for 1 hour until a uniform state is achieved.

[0252] Preparation of the second component

[0253] Exactly the same as Example 1.

[0254] Comparative Example 2

[0255] Preparation of the first component

[0256] Add 1,4-butanediol according to the weight parts listed in Table 1 to a reactor. Heat the reactor to 100°C, evacuate to -0.08 MPa, and stir continuously for 2 hours. Then cool to room temperature. Add diamino-terminated polyoxypropylene ether and magnesium hydroxide in the weight parts listed in Table 1, and stir continuously under vacuum for 1 hour until the mixture is homogeneous.

[0257] Preparation of the second component

[0258] Exactly the same as Example 1.

[0259] The relevant weight parts in the above Examples 1-31 and Comparative Examples 1-2 are shown in the following Table 1.

[0260] Table 1: Weight parts of Examples 1-31 and Comparative Examples 1-2

[0261] In addition, as described below, the ratio of "(hydroxyl value of the polyol polymer × weight of the polyol polymer) / (amine value of the polyamine polymer × weight of the polyamine polymer)" in the first component and the ratio of the isocyanate equivalent weight of the second component to the sum of the hydroxyl equivalent weight of the first component and the active hydrogen equivalent weight of the first component were calculated, and the shear strength and tensile strength of the adhesive were tested. The calculation and test results are shown in Table 2 below.

[0262] Shear Strength Test: Use a dispensing machine to pump the first and second components into a mixing chamber in a 1:1 volume ratio. After thorough mixing, apply the adhesive (i.e., the mixture of the first and second components) to one end of an aluminum substrate (steel, PET, ABS, PC, PMMA, epoxy coating, UV coating, polyurethane coating, or composite material) according to the panel preparation process specified in GBT 7124. Align the adhesive with another aluminum substrate to cover the applied area. The adhesive was then placed at 25°C and 4°C for 1 minute, 4 hours, and 7 days, respectively. Shear strength was then tested according to GBT 7124 at a tensile speed of 5 mm / min and an adhesive layer thickness of 0.25 ± 0.05 mm.

[0263] Tensile Strength Test: Use a dispensing machine to pump the first and second components into a mixing chamber in a 1:1 volume ratio. After thorough mixing, apply the adhesive (i.e., the mixture of the first and second components) to one end of an aluminum substrate (steel, PET, ABS, PC, PMMA, epoxy coating, UV coating, polyurethane coating, or composite material) according to the panel preparation process in GBT 6329. Align the adhesive with another aluminum substrate to cover the applied area. The adhesive is then placed at 25°C and 4°C for 1 minute, 4 hours, and 7 days, respectively. The tensile strength is then tested according to GBT 6329, using a tensile speed of 5 mm / min and a 1 mm adhesive layer thickness.

[0264] Table 2: Calculation results and test results related to Examples 1-31 and Comparative Examples 1-2

[0265] According to the above results, the adhesive compositions in Examples 1-31 all contain a first component and a second component, the first component contains a polyol polymer and a polyamine polymer, and the second component contains an isocyanate compound. From the comparison of Examples 1-31 and Comparative Examples 1-2, it can be seen that the adhesive composition of the present application has appropriate tensile strength (e.g., ≥0.4Mpa and ≤3Mpa) within 4 hours at room temperature and low temperature, which makes it easy to rework during the production process of the battery pack. In addition, the adhesive composition of the present application has a high tensile strength (e.g., ≥5Mpa) and shear strength (e.g., ≥5Mpa) after 7 days at room temperature, so that the components of the battery pack that have passed the quality inspection are more firmly bonded together.

[0266] From the comparison of Examples 1-31 and Comparative Example 1, it can be seen that when the first component contains a polyamine polymer, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which makes it easy to rework during the production process of the battery pack. In addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature and low temperature, so that the components of the battery pack that have passed the quality inspection are more firmly bonded together. In addition, the adhesive composition of the present application can be quickly cured in the early stage (within 1 minute and 4 hours) at room temperature and low temperature, so that a certain bonding force (tensile strength) is formed between the components, shortening the time for the next process, thereby improving production efficiency.

[0267] A comparison of Examples 1-31 and Comparative Example 2 shows that when the first component includes a polyol polymer, the adhesive composition of the present application exhibits adequate tensile strength within 4 hours at both room and low temperatures, facilitating rework during battery pack production. Furthermore, after 7 days at room temperature, the adhesive composition of the present application exhibits high tensile and shear strengths, ensuring a more secure bonding of the components of the battery pack that has passed quality inspection.

[0268] From the comparison of Examples 1-31 and Comparative Examples 1-2, it can be seen that when (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.1-10, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0269] From the comparison of Examples 6-9, 14-19, 22-31 and Examples 1-5, 10-13, it can be seen that when (hydroxyl value of polyol polymer × weight of polyol polymer) / (amine value of polyamine polymer × weight of polyamine polymer) is in the range of 0.4-1.2, the adhesive composition of the present application has further higher tensile strength and shear strength (for example, ≥9 MPa at room temperature and ≥6 MPa at low temperature) after 7 days at room temperature and low temperature, so that the components of the battery pack that have passed the quality inspection are further more firmly bonded together.

[0270] From the comparison of Examples 1-31 and Comparative Examples 1-2, it can be seen that when the ratio of the isocyanate equivalent of the second component to the sum of the hydroxyl equivalent of the first component and the active hydrogen equivalent of the first component is in the range of 0.4-2, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0271] From the comparison between Example 7 and Examples 14-16, it can be seen that regardless of whether the first component contains a chain extender and a first filler, and regardless of whether the second component contains a second filler, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0272] From the comparison between Example 7 and Example 17, it can be seen that when the first auxiliary agent is included in the first component, the adhesive composition of the present application can be further quickly cured at room temperature and low temperature in the initial stage (within 1 minute, 4 hours), so that a certain bonding force (tensile strength) is formed between the components, further shortening the time for the next process, thereby further improving production efficiency; in addition, the adhesive composition of the present application has further higher tensile strength and shear strength after 7 days at room temperature and low temperature, so that the components of the battery pack that have passed the quality inspection are further more firmly bonded together.

[0273] From the comparison between Example 7 and Examples 18-19, it can be seen that regardless of whether the isocyanate compound in the second component is isocyanate, isocyanate prepolymer, or a mixture of the two, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0274] From the comparison between Example 7 and Examples 20-22, it can be seen that no matter whether the polyol polymer in the first component is any one or more of polyester polyol, polyether polyol, polyolefin polyol, and vegetable oil polyol, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0275] From the comparison between Example 7 and Examples 23-24, it can be seen that no matter whether the polyamine polymer in the first component is polytetramethylene ether glycol bis-para-aminobenzoate, diamino-terminated polyoxypropylene ether, ternary amino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, polyaspartic acid ester, benzothiazole-modified polyaspartic acid ester, amino-terminated polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, aromatic diethyltoluene diprimary amine or any one or more thereof, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed the quality inspection are more firmly bonded together.

[0276] From the comparison between Example 7 and Examples 25-26, it can be seen that no matter whether the isocyanate in the second component is any one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxyaniline isocyanate, and alkylated phenylene diisocyanate, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0277] From the comparison between Example 7 and Examples 27-28, it can be seen that no matter whether the isocyanate prepolymer in the second component is any one or more of hexamethylene diisocyanate prepolymer, polymethylene polyphenyl polyisocyanate prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate prepolymer, dimethoxyaniline isocyanate prepolymer, and alkylated phenylene diisocyanate prepolymer, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed the quality inspection are more firmly bonded together.

[0278] From the comparison between Example 7 and Examples 29-30, it can be seen that no matter whether the chain extender in the first component is any one or more of a polyol chain extender and a polyamine chain extender, no matter whether the polyol chain extender is any one or more of 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, tetraethylene glycol, 1,2-propylene glycol, methylpropylene glycol, neopentyl glycol, trimethylolpropane, trimethylolethane, pentaerythritol, xylitol, sorbitol, glycerol, and diethylaminoethanol, no matter whether the polyamine chain extender is any one or more of diethyltoluenediamine, dimethylthiotoluenediamine, N,N'-dialkylmethyldiol Any one or more of amine, diaminodiphenylmethane, isophorone diamine, methyldiethanolamine, diacetylethylenediamine, dialkyltoluene diamine, 1,4-bis-sec-butylaminobenzene, bis-sec-butylaminodiphenylmethane, N,N'-bis-swollenpentylcyclohexanediamine, and methyldiethanolamine. The adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, making it easy to rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed the quality inspection are more firmly bonded together.

[0279] From the comparison between Example 7 and Example 31, it can be seen that regardless of whether the first filler in the first component and the second filler in the second component are independently any one or more of aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium carbonate, talc, silicon dioxide, glass beads, diatomaceous earth, kaolin, silicon powder, titanium dioxide, carbon powder, phthalocyanine blue, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, zinc oxide, magnesium oxide, and cerium oxide, the adhesive composition of the present application has appropriate tensile strength within 4 hours at room temperature and low temperature, which facilitates rework during the production process of the battery pack; in addition, the adhesive composition of the present application has high tensile strength and shear strength after 7 days at room temperature, so that the components of the battery pack that have passed quality inspection are more firmly bonded together.

[0280] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. An adhesive composition, comprising a first component and a second component, wherein the first component comprises a polyol polymer and a polyamine polymer, and the second component comprises an isocyanate compound.

2. The adhesive composition according to claim 1, wherein (Hydroxyl value of the polyol polymer×weight of the polyol polymer) / (amine value of the polyamine polymer×weight of the polyamine polymer) is in the range of 0.1-10, preferably in the range of 0.4-1.

2.

3. The adhesive composition according to claim 1 or 2, wherein the ratio of the isocyanate equivalent of the second component to the sum of the hydroxyl equivalent of the first component and the active hydrogen equivalent of the first component is in the range of 0.4-2.

4. The adhesive composition according to any one of the preceding claims, wherein the isocyanate compound comprises isocyanate and / or isocyanate prepolymer.

5. The adhesive composition according to any one of the preceding claims, wherein the polyol polymer comprises one or more of polyester polyol, polyether polyol, polyolefin polyol, and vegetable oil polyol.

6. The adhesive composition according to claim 5, wherein the polyester polyol comprises one or more of polycarbonate diol, polycaprolactone diol, polycaprolactone triol, polyethylene adipate diol, polypropylene adipate diol, polybutylene adipate-1,4-diol, polydiethylene adipate diol, polydiethylene phthalate, polyhexane-1,6-phthalate diol, and polyneopentyl phthalate diol.

7. The adhesive composition according to claim 5, wherein the polyether polyol comprises one or more of polyethylene oxide glycol, polypropylene oxide glycol, polypropylene oxide triol, polypropylene oxide tetraol, polytetrahydrofuran glycol, tetrahydrofuran-ethylene oxide copolymer glycol, tetrahydrofuran-propylene oxide copolymer glycol, and ethylene oxide-propylene oxide copolymer glycol.

8. The adhesive composition according to claim 5, wherein the polyolefin polyol comprises one or more of hydroxyl-terminated polybutadiene, hydroxyl-terminated epoxidized polybutadiene, hydroxyl-terminated polybutadiene-acrylonitrile copolymer, and polystyrene polyethylene glycol.

9. The adhesive composition according to claim 5, wherein the vegetable oil polyol comprises one or more of castor oil polyol, soybean oil polyol, and palm oil polyol.

10. The adhesive composition according to any one of the preceding claims, wherein the polyamine polymer comprises one or more of polytetramethylene ether glycol bis-p-aminobenzoate, diamino-terminated polyoxypropylene ether, triamino-terminated polyoxypropylene ether, amino-terminated polyoxyethylene ether, polyaspartic acid ester, benzothiazole-modified polyaspartic acid ester, amino-terminated polytetrahydrofuran, difunctional aliphatic polyester primary amine, trifunctional aliphatic polyester primary amine, and aromatic diethyltoluene diprimary amine.

11. The adhesive composition according to any one of claims 4 to 10, wherein the isocyanate prepolymer comprises one or more of hexamethylene diisocyanate prepolymer, polymethylene polyphenyl polyisocyanate prepolymer, diphenylmethane diisocyanate prepolymer, carbodiimide-modified diphenylmethane diisocyanate prepolymer, isophorone diisocyanate prepolymer, toluene diisocyanate prepolymer, xylene diisocyanate prepolymer, phenylene diisocyanate prepolymer, dimethoxyaniline isocyanate prepolymer, and alkylated phenylene diisocyanate prepolymer.

12. The adhesive composition according to any one of claims 4 to 10, wherein the isocyanate comprises one or more of hexamethylene diisocyanate, polymethylene polyphenyl polyisocyanate, diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylene diisocyanate, phenylene diisocyanate, dimethoxyaniline isocyanate, and alkylated phenylene diisocyanate.

13. The adhesive composition according to any one of the preceding claims, wherein the first component further comprises one or more of a chain extender, a first filler, and a first auxiliary agent.

14. The adhesive composition according to any one of the preceding claims, wherein the second component further comprises one or more of a second filler and a second auxiliary agent. 15 . The adhesive composition according to claim 13 , wherein the chain extender comprises one or more of a polyol chain extender and a polyamine chain extender.

16. The adhesive composition according to claim 15, wherein the polyol chain extender comprises one or more of 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, tetraethylene glycol, 1,2-propylene glycol, methylpropanediol, neopentyl glycol, trimethylolpropane, trimethylolethane, pentaerythritol, xylitol, sorbitol, glycerol, and diethylaminoethanol.

17. The adhesive composition according to claim 15, wherein the polyamine chain extender comprises one or more of diethyltoluenediamine, dimethylthiotoluenediamine, N,N'-dialkylmethyldiamine, diaminodiphenylmethane, isophoronediamine, methyldiethanolamine, diacetylethylenediamine, dialkyltoluenediamine, 1,4-bis-sec-butylaminobenzene, bis-sec-butylaminodiphenylmethane, N,N'-bis-pentylcyclohexanediamine, and methyldiethanolamine.

18. The adhesive composition according to any one of claims 13 to 17, wherein the first filler and the second filler independently include one or more of aluminum hydroxide, magnesium hydroxide, barium sulfate, calcium carbonate, talc, silicon dioxide, glass microspheres, diatomaceous earth, kaolin, silica powder, titanium dioxide, carbon powder, phthalocyanine blue, aluminum oxide, aluminum nitride, boron nitride, beryllium oxide, zinc oxide, magnesium oxide, and cerium oxide.

19. The adhesive composition according to any one of claims 13 to 18, wherein the first auxiliary agent and the second auxiliary agent independently comprise one or more of a leveling agent, a defoaming agent, a thixotropic agent, a wetting agent, a catalyst, an antioxidant, an anti-ultraviolet agent, a plasticizer, a slip agent, and an anti-blocking agent.

20. An adhesive composition according to any one of the preceding claims, wherein the first component comprises Polyol polymer: 10-70 parts by weight Polyamine polymer: 5-65 parts by weight, Chain extender: 0-5 parts by weight, First filler: 0-20 parts by weight, and The first auxiliary agent: 0-1 parts by weight, and The second component comprises Isocyanate and / or isocyanate prepolymer: 80 parts by weight, Second filler: 0-20 parts by weight, and Second auxiliary agent: 0-1 part by weight.

21. A method for preparing an adhesive composition as claimed in any one of claims 1 to 20, the method comprising the following steps: (1) mixing the polyol polymer, the polyamine polymer, the optional chain extender, the optional first filler, and the optional first auxiliary agent to obtain the first component; and (2) preparing the isocyanate compound and mixing it with an optional second filler and an optional second auxiliary agent to obtain the second component.

22. A battery pack comprising the adhesive composition according to any one of claims 1 to 20 or the adhesive composition prepared by the method according to claim 21.

23. An electrical device comprising the battery pack according to claim 22.

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