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WO2023225940A1 - Liant, et film isolant et module de batterie l'utilisant - Google Patents

Liant, et film isolant et module de batterie l'utilisant Download PDF

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Publication number
WO2023225940A1
WO2023225940A1 PCT/CN2022/095240 CN2022095240W WO2023225940A1 WO 2023225940 A1 WO2023225940 A1 WO 2023225940A1 CN 2022095240 W CN2022095240 W CN 2022095240W WO 2023225940 A1 WO2023225940 A1 WO 2023225940A1
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WIPO (PCT)
Prior art keywords
weight
adhesive
binder
battery
cellulose
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Ceased
Application number
PCT/CN2022/095240
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English (en)
Chinese (zh)
Inventor
陆阳
祁少伟
杨献伟
齐晨
叶永煌
任苗苗
靳超
李莲华
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to PCT/CN2022/095240 priority Critical patent/WO2023225940A1/fr
Priority to CN202280040507.2A priority patent/CN117480673A/zh
Publication of WO2023225940A1 publication Critical patent/WO2023225940A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings

Definitions

  • the present application relates to the technical field of adhesives, and in particular to an adhesive, an insulating film and a battery module using the same.
  • Lithium-ion power batteries are mainly used in electric vehicles.
  • the current common assembly form is: battery modules are composed of battery cells and accessories, and then the battery modules and accessories are composed of battery packs, which are then installed on the vehicle to provide power. Since the vehicle Uncertainty in driving scenarios and possible collisions can easily cause collisions between battery cells and between battery cells and other components in the battery module, thus causing safety accidents.
  • This application was made in view of the above problems, and its purpose is to provide an adhesive, an insulating film using the same, and a battery module, aiming to improve the problem of adhesive failure and improve the vibration resistance and resistance of the battery module. Impact performance.
  • the first aspect of this application provides an adhesive, which includes:
  • the adhesive of the present application includes:
  • curing agent optionally from 1% to 5% by weight; 10% to 40% by weight of solvent, optionally from 15% to 35% by weight; each based on the binder of total weight.
  • the cyclic oligosaccharide in the binder of the present application is selected from one or more of ⁇ -cyclodextrin, ⁇ -cyclodextrin and ⁇ -cyclodextrin.
  • the adhesive in the adhesive of the present application is selected from one or more of polyvinyl acetate, polyvinyl alcohol, vinyl perchloride, polyisobutylene, cellulose ester and polyacrylic acid; optionally , the number average molecular weight of the adhesive is 1,000-90,000, optionally 5,000-50,000.
  • the curing agent in the adhesive of the present application is a polyamide curing agent.
  • the solvent in the binder of the present application is selected from one or more of carbon tetrachloride, ethyl acetate, methyl formate, ethanol, and toluene; optionally, the solvent is toluene .
  • the binder of the present application also contains cellulose, and the cellulose is selected from the group consisting of hydroxypropyl methyl cellulose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, One or more of cellulose and carboxymethyl cellulose, optionally, the content of the cellulose is 2% to 25% by weight, optionally 3% to 20% by weight, based on the viscosity The total weight of the binder.
  • a second aspect of the application provides an insulating film, including a base film and an organic coating located on at least one surface of the base film.
  • the organic coating includes the adhesive described in the first aspect of the application.
  • the organic coating The thickness of the layer is 90 ⁇ m-300 ⁇ m, optional 100 ⁇ m-200 ⁇ m.
  • the base film is made from at least one polymer selected from the group consisting of polyethylene, polyvinyl chloride, polypropylene, and polyethylene terephthalate.
  • the base film is a film made of polyethylene terephthalate, and the base film is hydroxylated.
  • a third aspect of this application provides a battery module, including side-by-side battery cells and end plates and side plates surrounding the battery cells, wherein the battery module meets at least one of the following conditions:
  • the battery shell of the battery cell is wrapped with the insulating film of the second aspect of the present application;
  • the battery cells, the battery cells and the side plates, and the battery cells and the end plates are bonded by the adhesive of the first aspect of the present application.
  • a fourth aspect of the present application provides a battery pack, including the battery module of the third aspect of the present application, and the battery pack serves as a power source for an electrical device.
  • This application develops an adhesive with excellent bonding ability, earthquake resistance, and impact resistance.
  • the vibration resistance and impact resistance of the battery module using the adhesive are significantly improved, and the short circuit phenomenon in the battery pack is eliminated.
  • the adhesive of the present application is used as a coating component to prepare an insulating film, and the insulating film is used to wrap on the surface of the battery cell shell to provide insulation and earthquake resistance;
  • the adhesive of the present application serves as an adhesive to bind battery cells and battery cells/battery cells and end plates/battery cells and side plates, further strengthening the battery module.
  • the role of firmness and earthquake resistance The vibration resistance and impact resistance of the battery pack using the binder are significantly improved, the short circuit phenomenon in the battery pack is significantly reduced, and the safety performance of the vehicle is significantly improved.
  • FIG. 1 is an infrared spectrum of a base film of an insulating film according to an embodiment of the present application.
  • Figure 2 is an insulating film according to an embodiment of the present application, in which one side of the base film is coated with the adhesive of the present application.
  • FIG. 3 is a schematic diagram of a battery module composed of battery cells according to an embodiment of the present application, in which the battery cell shell is wrapped with an insulating film.
  • FIG. 4 is a schematic diagram of a battery module assembled into a battery pack according to an embodiment of the present application.
  • Ranges disclosed herein are defined in terms of lower and upper limits. A given range is defined by selecting a lower limit and an upper limit that define the boundaries of the particular range. Ranges defined in this manner may be inclusive or exclusive of the endpoints, and may be arbitrarily combined, that is, any lower limit may be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a particular parameter, understand that ranges of 60-110 and 80-120 are also expected. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2- 3, 2-4 and 2-5.
  • the numerical range “a-b” represents an abbreviated representation of any combination of real numbers between a and b, where a and b are both real numbers.
  • the numerical range “0-5" means that all real numbers between "0-5" have been listed in this article, and "0-5" is just an abbreviation of these numerical combinations.
  • a certain parameter is an integer ⁇ 2
  • condition "A or B” is satisfied by any of the following conditions: 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).
  • an adhesive is usually used to bond the battery cells to each other, and then the end plates and side plates are bonded using the adhesive.
  • the plate is fixed to the battery cell.
  • the outer shell surface of the battery cells needs to be covered with an insulating film.
  • the adhesive may easily fall off, resulting in displacement of the battery cells in the battery module, and in turn, damage to the insulating film on the surface of the battery cell casing. A short circuit between battery cells may cause vehicle safety accidents.
  • this application starts from increasing the bonding ability, earthquake resistance, and impact resistance between battery cells in the battery module, and develops an adhesive that has both excellent bonding ability, earthquake resistance, and impact resistance.
  • Binder, the vibration resistance and impact resistance of the battery module using the binder are significantly improved, the short circuit phenomenon in the battery pack is significantly reduced, and the safety performance of the vehicle during driving is significantly improved.
  • an adhesive which includes:
  • the adhesive of the present application is used as a coating component to prepare an insulating film, and the insulating film is used to wrap on the surface of the battery cell shell to provide insulation and earthquake resistance;
  • the adhesive of the present application serves as an adhesive to bind battery cells and battery cells/battery cells and end plates/battery cells and side plates, further strengthening the battery module.
  • the role of firmness and earthquake resistance The vibration resistance and impact resistance of the battery pack using the binder are significantly improved, the short circuit phenomenon in the battery pack is significantly reduced, and the safety performance of the vehicle is significantly improved.
  • cyclic oligosaccharides composed of several glucose units bonded with 1,4-glycosidic bonds have a three-dimensional cyclic structure of a hollow cylinder.
  • This three-dimensional cyclic structure makes the cyclic low Glycan molecules can withstand repeated microscopic strains in different directions without structural disintegration.
  • the inner ring edge of cyclic oligosaccharides is mainly composed of C-H bonds and is hydrophobic. This hydrophobic hole can be embedded in long-chain polymer compounds and further decompose microscopic stress by forming a cross-linked network. Therefore, the cyclic oligosaccharide can improve the bonding performance of the binder under long-term vibration and impact strain, so that the battery module has good earthquake resistance and impact resistance.
  • the adhesives of the present application include:
  • curing agent optionally from 1% to 5% by weight; 10% to 40% by weight of solvent, optionally from 15% to 35% by weight; each based on the binder of total weight.
  • the content of the cyclic oligosaccharide is 20% to 50% by weight, optionally 25% to 35% by weight, more optionally 28% to 32% by weight, based on the binder. Total weight.
  • the bonding effect of the adhesive will be significantly reduced under long-term vibration and impact strain. Only within the appropriate range, the adhesive can maintain good bonding performance and function without failure under long-term vibration and impact strain.
  • the cyclic oligosaccharide has the following general formula:
  • R is selected from one or more of hydrogen atom, NH 2 , C1-C6 alkyl group, C1-C6 alkylcarbonyl group and C1-C6 alkyl hydroxyl group, n is an integer from 0 to 6, optional 1 An integer of -3; optionally, the cyclic oligosaccharide is selected from one or more of ⁇ -cyclodextrin, ⁇ -cyclodextrin and ⁇ -cyclodextrin.
  • C1-C6 alkyl refers to a straight-chain or branched-chain hydrocarbon with 1 to 6 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl base, isobutyl, sec-butyl, tert-butyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1,2-dimethylpropyl, 1, 1-dimethylpropyl, 2,2-dimethylpropyl, 1-ethylpropyl, hexyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4- Methylpentyl, 1,2-dimethylpropyl, 1,3-dimethylbutyl, 1,4-dimethylbutyl, 2,3-dimethylbutyl, 1,1-dimethylbutyl Methylbutyl, 2,2-dimethylbutyl,
  • alkyl groups having 1 to 4 carbon atoms for example especially methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl or tert-butyl.
  • cyclic oligosaccharides can be purchased directly or directly synthesized using existing technical means.
  • an integer from 0 to 6 refers to the integers of 0, 1, 2, 3, 4, 5 and 6.
  • ⁇ -cyclodextrin with a corresponding number of glucose monomer molecules of 7 and ⁇ -cyclodextrin with a corresponding number of glucose monomer molecules of 8 can also provide good resistance to vibration and impact strain.
  • the cyclic oligosaccharide is ⁇ -cyclodextrin
  • the corresponding number of glucose monomer molecules is 6, and its cavity size can allow some long-chain polymers to pass through; when the number of glucose monomer molecules increases When the temperature increases, the cavity size becomes larger, and the vibration and impact strain resistance of cyclodextrin is correspondingly weakened. Therefore, ⁇ -cyclodextrin can provide better vibration and impact strain resistance.
  • the content of the adhesive is 20% to 50% by weight, optionally 25% to 40% by weight, and optionally 26% to 35% by weight, based on the total weight of the adhesive.
  • the bonding performance of the adhesive can be further improved, thereby improving the vibration resistance and strain resistance of the corresponding battery module.
  • the adhesive is selected from one or more of polyvinyl acetate, polyvinyl alcohol, vinyl perchloride, polyisobutylene, cellulose ester and polyacrylic acid.
  • the adhesive has a number average molecular weight of 1,000-90,000, optionally 5,000-50,000, and optionally 5,500-20,000.
  • the molecular weight range of the adhesive can be selected from 5500-20000.
  • the number average molecular weight is determined by gel permeation chromatography (GPC) method according to GB/T 21863-2008 "Gel permeation chromatography (GPC) using tetrahydrofuran as eluent” (equivalent to the German standard DIN 55672- 1: 2007 “Gel permeation chromatography (GPC) Part 1: Using tetrahydrofuran (THF) as the elution solvent”).
  • the adhesive has a degree of polymerization of 100-2000, optionally 200-1000, more optionally 300-600.
  • the adhesive has a viscosity of 5000 mPa ⁇ s to 15000 mPa ⁇ s.
  • the adhesive When the viscosity of the adhesive is too low, the adhesive behaves as a Newtonian fluid and has poor film-forming properties, which may lead to leakage problems when applying glue. When the viscosity is too high, the adhesive has poor dispersion and is prone to agglomeration, which also affects film-forming properties, leading to leakage problems. .
  • the viscosity of the adhesive can be tested at 25°C using the rotation method according to the standard GB/T 10247-2008.
  • the specific operation of this standard is as follows: fill the beaker or sample container with the sample to be tested, making sure not to introduce air bubbles, and if necessary, vacuum to eliminate the air bubbles. If the sample is volatile or easily hygroscopic, the beaker or sample container must be sealed during the constant temperature process. Place the prepared sample beaker or sample container into the constant temperature bath and ensure sufficient time to reach the specified temperature. Choose a suitable rotor so that the reading is between 20% and 90% of the maximum range.
  • the 63# rotor For the 63# rotor, it should meet the requirements of 1000mpa ⁇ s ⁇ viscosity ⁇ 10000mpa ⁇ s, 20% ⁇ torque percentage ⁇ 90%. If the viscosity result is NG, use the 64# rotor, and the following results should be met at the same time: 10000mpa ⁇ s ⁇ viscosity, 20 % ⁇ torque percentage ⁇ 90%.
  • the rotor groove was flush with the slurry surface. Turn on the motor. After 5 minutes, when the viscosity reading of the instrument stabilizes, stop the motor. After the rotor stops, turn on the motor again for the second test until the deviation of the two consecutive test data from the average value is no more than 3%. The result is the sum of the two measured values. average.
  • the binder composition further comprises cellulose selected from the group consisting of hydroxypropylmethylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose One or more of cellulose and carboxymethyl cellulose.
  • Cellulose mainly plays a cross-linking role in the binder of this application, allowing organic molecules such as adhesives, cyclic oligosaccharides, and curing agents to be cross-linked through cellulose, thereby further increasing the bonding performance and earthquake resistance of the binder.
  • the content of the cellulose is 2% to 25% by weight, optionally 3% to 20% by weight, optionally 5% to 15% by weight, and optionally 8% to 20% by weight. 12% by weight, based on the total weight of binder.
  • the cellulose is hydroxypropyl methylcellulose, which has hydroxyl, propyl, and methyl functional groups on the cellulose chain.
  • Various types of functional groups improve the performance of nanocellulose in the binder.
  • the cross-linking effect makes the adhesive have good adhesion.
  • the cellulose has a number average molecular weight of 10,000-30,000, optionally 15,000 to 25,000.
  • the cellulose is nanocellulose, and its particle size Dv50 is 10 nm-100 nm, optionally 30 nm-70 nm.
  • the Dv50 of nanocellulose is the same as the particle size of ⁇ -cyclodextrin (usually 30-70 nm).
  • the particle size Dv50 of the nanocellulose can be measured using a laser particle size analyzer (such as Malvern Master Size 3000) with reference to the standard GB/T 19077.1-2016.
  • a laser particle size analyzer such as Malvern Master Size 3000
  • the physical definition of Dv50 is as follows:
  • Dv50 The particle size corresponding to when the cumulative volume distribution percentage of the particles reaches 50%.
  • cellulose with other particle sizes can also be used and ground to the required particle size as needed.
  • the method of grinding particles is also well known to those skilled in the art.
  • cellulose can be combined with the outer edge of the cyclic oligomer through hydrogen bonding, and then form a cross-linked network through intermolecular interaction with adhesives and curing agents, further allowing the adhesive to It still has good bonding performance under long-term vibration and impact strain conditions.
  • the weight ratio of adhesive: cyclic oligosaccharide: cellulose is (1.5-4): (1.5-5): 1, optional (2-3.5): (2-3.5): 1, Also optional is (2.5-3.3): (2.5-3.3): 1.
  • the curing agent is a polyamide curing agent, such as Versamid 125 curing agent.
  • amide curing agents have better curing effects and can also give the composition better bonding properties in humid environments.
  • the content of the curing agent is 0.5 to 10% by weight, optionally 1 to 5% by weight, more optionally 1.5 to 4% by weight, based on the total weight of the binder.
  • the solvent is selected from one or more of carbon tetrachloride, ethyl acetate, methyl formate, ethanol, and toluene.
  • the solvent is toluene.
  • Each component of the binder has better dispersion effect in toluene solution and has the best coating performance.
  • the solvent is present in an amount of 10 to 40 wt%, optionally 15 to 35 wt%, 20 to 30 wt%, based on the total weight of the binder.
  • the solvent can promote the dispersion of each component and the occurrence of cross-linking reaction. After coating, the solvent gradually evaporates, causing the adhesive to produce a bonding effect.
  • a second aspect of the application provides an insulating film, including a base film and an organic coating located on at least one surface of the base film.
  • the organic coating includes the binder described in the first aspect of the application.
  • the organic coating The thickness of the coating is 90 ⁇ m-300 ⁇ m, optional 100 ⁇ m-200 ⁇ m.
  • the base film is made from at least one polymer selected from the group consisting of polyethylene, polyvinyl chloride, polypropylene, and polyethylene terephthalate.
  • the coating method can be a method commonly used in this field, such as using a doctor blade cast coating method, and the doctor blade gap is adjusted to 50 ⁇ m to 260 ⁇ m, optionally 100 ⁇ m to 200 ⁇ m.
  • the base film is a polymer film made from a polymer with a number average molecular weight of 20,000 to 30,000.
  • the base film has a thickness of 50 ⁇ m to 300 ⁇ m, optionally 80 ⁇ m to 200 ⁇ m.
  • the base film is hydroxylated.
  • the hydroxylation treatment can be carried out in the following manner: coating the hydroxylation reagent on the film surface (the coating thickness can be 100-300 ⁇ m), and then heating it at 10°C-50°C, optionally 20°C-30 React at °C for 1 to 20 minutes, optionally 5 to 15 minutes, and then wash the treated surface with deionized water to remove the hydroxylation reagent (for example, use pH test paper to measure the membrane surface, and the pH value is considered to be 7.0 to 7.5. Remove hydroxylating reagent).
  • the hydroxylating reagent can be one or more of 10 to 60 wt% NaOH solution and 10 to 60 wt% KOH solution; optionally, the hydroxylating reagent can be 10 wt% to 60 wt% NaOH solution, optionally 20 to 40 wt% NaOH solution.
  • the base film can also be pre-treated before being hydroxylated, such as using ethanol and deionized water for surface cleaning.
  • hydroxyl groups under alkaline conditions can avoid the impact of hydroxylation reagent residues on cyclodextrin molecules; a reasonable selection of the concentration range of the alkaline hydroxylation solution can also avoid damage to the basement membrane.
  • the base film is made of polyethylene terephthalate (PET).
  • PET membrane has high chemical stability, but there are no hydrophilic groups on the PET molecular chain and has poor compatibility with most polymers; hydroxylation treatment in an alkaline solution can improve the reactivity of the membrane surface, It is beneficial for the adhesive to adhere well to the PET film.
  • FIG 2 is an insulating film of the present application, in which one side of the base film B is coated with the adhesive A of the present application.
  • a third aspect of the present application provides a battery module, which includes side-by-side battery cells and end plates and side plates surrounding the battery cells.
  • Figure 3 is a battery module composed of six battery cells arranged side by side.
  • the battery shell of the battery cells is wrapped with the insulating film of the second aspect of the present application.
  • the bonding between battery cells, between the battery cells and the side plate S, and between the battery cells and the end plate E are achieved through the bonding method of the first aspect of the present application. agent bonding.
  • This application has no particular limitation on the shape of the battery cell, which can be cylindrical, square or any other shape.
  • the number of battery cells contained in the battery module may be one or more.
  • the specific number can be selected by those skilled in the art according to the application and capacity of the battery module.
  • the above-mentioned battery modules can also be assembled into a battery pack. See Figure 4.
  • the number of battery modules contained in the battery pack can be one or more. The specific number can be determined by those skilled in the art according to the application and capacity of the battery pack. choose.
  • the battery pack can be used as a power source for the electrical device or as an energy storage unit for the electrical device.
  • the electric 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, and electric golf carts). , electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc., but are not limited to these.
  • the preparation method of the binder is as follows: 30% polyacrylic acid (purchased from McLean, P890197), 30% ⁇ -cyclodextrin (purchased from McLean, C804818), 10 % hydroxypropyl methylcellulose (purchased from McLean, H811095), 28% by weight toluene and 2% by weight Versamid 125 curing agent were mixed evenly to obtain the adhesive of Example 1.
  • Step 1 Pretreat the PET base film (thickness: 100 ⁇ m). Use ethanol as a cleaning agent, treat it at room temperature (25°C, the same below) for 15 minutes, rinse it with deionized water three times, and dry it naturally at room temperature;
  • Step 2 Hydroxylate the pretreated PET base film.
  • the specific method is: evenly apply 30% by weight NaOH solution on both sides of the PET base film. After reacting at room temperature for 10 minutes, use deionized water to rinse the PET base film surface until it is neutral (use pH test paper to measure the pH of the lotion. value is 7.0), let it dry naturally at room temperature;
  • Step 3 Use a scraper to evenly coat the above adhesive on both sides of the PET base film (use a scraper cast machine, adjust the scraper gap to 125 ⁇ m), and apply the organic layer to a thickness of 125 ⁇ m.
  • the battery cell casing is only covered with PET base film, and acrylic structural adhesive (brand: 3M, model: DP8805NS) is used between the battery cells in the battery module and between the battery cells and the end plates and side plates.
  • acrylic structural adhesive brand: 3M, model: DP8805NS
  • a universal testing machine (MTS, model: CDT1100) was used to test the battery modules corresponding to all the above embodiments and comparative examples.
  • Vibration strain test in different directions Apply vibration strains in the x, y, and z directions of the battery module (see Figure 3). Set the vibration conditions to a vibration frequency range of 100-1500Hz and a high-frequency vibration duration of 8 hours. The vibration acceleration range is 0-100m/s 2. After the test, disassemble the battery module and record the frequency change amplitude of the battery cells in the tested battery pack before and after vibration. The smaller the change rate, the better the battery module is against vibration. The better the performance;
  • Impact strain test in different directions Apply impact strains in the x, y, and z directions of the battery module respectively. Set the impact conditions to a vibration frequency range of 100-1500Hz, a high-frequency impact duration of 6ms, and an impact acceleration range of 0- 500m/s 2. After the test, disassemble the battery module and record the frequency change amplitude of the battery cells in the tested battery module before and after the impact. The smaller the change rate, the better the impact resistance.
  • the battery module is considered to have excellent vibration resistance
  • the battery module is considered to have good vibration resistance
  • the battery module is considered to have average vibration resistance
  • the battery module is considered to have poor vibration resistance
  • the battery module is considered to have excellent impact resistance
  • the battery module is considered to have good impact resistance
  • the battery module is considered to have average impact resistance
  • the impact resistance performance of the battery cell is considered to be poor if three of the frequency change rates in the x, y and z directions of the battery cell are above ⁇ 20% before and after the impact, or if at least one frequency change rate exceeds 30%.
  • the examples and comparative examples in Table 1 respectively evaluate the vibration resistance and impact resistance of the battery module of the present application based on the amount of cyclic oligosaccharide, the amount of adhesive, the amount of cellulose, whether the base film is hydroxylated and the thickness of the insulating film. Research was conducted, as follows:
  • the cyclic polymer content in the comparative example is outside the appropriate content.
  • the cyclic polymer content in the comparative example 1-1 is 0% by weight, which cannot increase the vibration and impact resistance of the binder.
  • the comparative example 1-2 The proportion of cyclic polymer content is too high and the proportion of polyacrylic acid is too low, resulting in poor bonding performance of the adhesive. Although it has certain vibration resistance, it cannot pass the impact resistance test.
  • Example 3-4 the proportion of cellulose is 0% by weight, and the binding effect of the binder is slightly weak, so its impact resistance is average.
  • Example 3-5 the proportion of cellulose is 30% by weight and the proportion of polyacrylic acid is At 10% by weight, the proportion of cellulose is too high and the proportion of polyacrylic acid is too low. Cellulose also cannot play a role in strengthening the adhesiveness, so its impact resistance is average.
  • the battery module obtained by bonding battery cells to battery cells using conventional acrylic structural adhesive has poor impact resistance and vibration performance
  • Comparative Examples 1-5 when the base film is not hydroxylated, the impact resistance and vibration resistance of the corresponding battery module are average. As shown in Figure 1, in the infrared spectrum of the binder of Example 1-1, there is an obvious absorption vibration peak of hydroxyl group at the wave number of 3600 cm -1 , while the non-hydroxylated binder of Comparative Example 1-5 has only a wave number of 3600 cm -1 . Weaker hydroxyl absorption vibration peaks, and more hydroxyl functional groups are beneficial to the bonding between the binder component in the organic coating and the hydroxyl groups on the surface of the base film.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un liant, et un film isolant et un module de batterie l'utilisant, le liant comprenant : un adhésif, un agent de durcissement, un solvant et 20 à 50 % en poids d'un oligosaccharide cyclique, sur la base du poids total du liant. Le liant présente une bonne capacité de liaison, une bonne résistance aux chocs et une bonne résistance à l'impact, la résistance aux vibrations et la résistance à l'impact du module de batterie à l'aide du liant sont considérablement améliorées, le phénomène de court-circuit d'une batterie est considérablement réduit, et les performances de sécurité d'un véhicule pendant la conduite sont considérablement améliorées.
PCT/CN2022/095240 2022-05-26 2022-05-26 Liant, et film isolant et module de batterie l'utilisant Ceased WO2023225940A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2022/095240 WO2023225940A1 (fr) 2022-05-26 2022-05-26 Liant, et film isolant et module de batterie l'utilisant
CN202280040507.2A CN117480673A (zh) 2022-05-26 2022-05-26 粘结剂、使用其的绝缘膜和电池模组

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/095240 WO2023225940A1 (fr) 2022-05-26 2022-05-26 Liant, et film isolant et module de batterie l'utilisant

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