A photocurable ink, insulating coating, battery case, method for producing the same, and battery

Abstract

This application provides a photocurable ink, an insulating coating, a battery casing, a method for preparing the same, and a battery. The photocurable ink includes an acrylic resin and an active monomer. The acrylic resin includes a polyester-type polyurethane acrylate resin and a bisphenol-type epoxy acrylate resin, and the mass ratio of the polyester-type polyurethane acrylate resin to the bisphenol-type epoxy acrylate resin is (3-6):1. By controlling the mass ratio of the polyester-type polyurethane acrylate resin to the bisphenol-type epoxy acrylate resin within the range of (3-6):1, the insulating coating can simultaneously possess good flexibility and thermal shrinkage resistance, making the insulating coating less prone to brittleness and thermal shrinkage, thereby improving the high-temperature resistance and mechanical properties of the insulating coating.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a photocurable ink, an insulating coating, a battery casing, a method for preparing the same, and a battery. Background Technology

[0002] Currently, lithium-ion batteries generally have an aluminum casing. In order to improve the electrical insulation performance of the lithium-ion battery surface, a spray printing process is generally used to spray an insulating ink onto the aluminum casing surface. Then, the insulating ink is photocured to obtain an integrated insulating coating.

[0003] However, in related technologies, insulating coatings are prone to brittleness and thermal shrinkage, and cannot simultaneously possess good high-temperature resistance and mechanical properties, which needs further improvement. Summary of the Invention

[0004] The embodiments of this application provide a photocurable ink, an insulating coating, a battery casing, a method for preparing the same, and a battery, aiming to solve the aforementioned technical problems.

[0005] In a first aspect, embodiments of this application provide a photocurable ink, comprising: an acrylic resin and an active monomer;

[0006] The acrylic resin includes polyester-type polyurethane acrylate resin and bisphenol-type epoxy acrylate resin, and the mass ratio of the polyester-type polyurethane acrylate resin to the bisphenol-type epoxy acrylate resin is (3-6):1.

[0007] In one embodiment, the bisphenol-type epoxy acrylate resin includes one or more of bisphenol A epoxy acrylate resin, bisphenol S epoxy acrylate resin, and bisphenol F epoxy acrylate resin; and / or

[0008] The acrylic resin in the photocurable ink comprises 20%-40% by mass; and / or

[0009] The active monomer in the photocurable ink has a mass percentage of 50%-70%; and / or

[0010] The mass ratio of the active monomer to the acrylic resin is (1.2-3.5):1; and / or

[0011] The active monomers include monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers, wherein the functionality of the polyfunctional acrylate monomers is greater than or equal to 3; and / or

[0012] The molecular weight of the polyester-type polyurethane acrylate resin is 1000-1500; and / or

[0013] The bisphenol type epoxy acrylate resin has a molecular weight of 1000-1500; and / or

[0014] The polyester-type polyurethane acrylate resin has the general structural formula shown in formula (1):

[0015]

[0016] and / or

[0017] The bisphenol type epoxy acrylate resin has the general structural formula shown in formula (2):

[0018]

[0019] In one embodiment, in the structural formula (1), R2, R5, and R6 are each independently selected from C1-C6 alkyl groups, and / or R4 is selected from hexamethylene or isophorone groups, and / or m is selected from integers from 2 to 10; and / or

[0020] In the structural formula (2), R1 is selected from hydrogen or C1-C6 alkyl groups, and / or n is selected from integers from 2 to 10; and / or

[0021] The mass ratio of the monofunctional acrylate monomer, the difunctional acrylate monomer, and the polyfunctional acrylate monomer is (4-6):1:(0.1-0.4); and / or

[0022] The monofunctional acrylate monomers include at least one of isobornyl acrylate, isodecyl acrylate, lauryl acrylate, or hexadecyl acrylate; and / or

[0023] The bifunctional acrylate monomers include at least one of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, and ethoxylated bisphenol A diacrylate; and / or

[0024] The multifunctional acrylate monomers include at least one of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol penta / hexaacrylate, and tri(2-hydroxyethyl)isocyanurate triacrylate.

[0025] In one embodiment, the photocurable ink further includes an initiator, pigment, additives, and / or diluent.

[0026] In one embodiment, the initiator includes a deep-curing initiator, a thioxanthone initiator, and an amine initiator, wherein the deep-curing initiator has an absorption wavelength of 300 nm-400 nm; and / or

[0027] The additives include wetting agents and adhesion agents; and / or

[0028] The diluent includes at least one of isoborneol acrylate, isodecyl acrylate, lauryl acrylate, or hexadecyl acrylate.

[0029] In one embodiment, the initiator in the photocurable ink comprises 2%-5% by mass; and / or

[0030] The pigment in the photocurable ink has a mass percentage of 0.5%-1%; and / or

[0031] The additive is present in the photocurable ink at a mass percentage of 1%-3%; and / or

[0032] The diluent in the photocurable ink has a mass percentage of 4%-5%; and / or

[0033] The pigment has a particle size D50 ≤ 0.4 μm.

[0034] In one embodiment, the deep curing initiator comprises at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, bis(1-(2,4-difluorophenyl)-3-pyrrolithyl)dicentectan, bis2,6-difluoro-3-pyrrolithyldicentectan, 2-hydroxy-2-methyl-1-phenylpropanone, and 1-hydroxycyclohexylphenyl ketone; and / or

[0035] The thioxanthone initiator includes at least one of 2-chlorothioxanthone, isopropylthioxanthone, and 2,4-diethylthioxanthone; and / or

[0036] The amine initiator includes at least one of an active amine and a tertiary amine benzoate; and / or

[0037] The wetting agent includes at least one of polyether-modified silicone and polyester-modified silicone; and / or

[0038] The adhesive comprises at least one of phosphate-modified acrylate and silane-modified polymer; and / or

[0039] The deep curing initiator in the photocurable ink has a mass percentage of 2%-5%; and / or

[0040] The combined mass percentage of the thioxanthone initiator and the amine initiator in the photocurable ink is 1%-3%; and / or

[0041] The mass ratio between the thioxanthone initiator and the amine initiator is 1:(0.2-0.5).

[0042] In one embodiment, the active amine includes at least one selected from ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, diethylamine, triethylamine, isophorone diamine, and 1,2-cyclohexanediamine; and / or

[0043] The tertiary amine benzoate includes at least one of ethyl 4-(N,N-dimethylamino)benzoate, ethyl N,N-diphenylmethylformate, and 2-ethylhexyl N,N-dimethylbenzoate.

[0044] Secondly, embodiments of this application also provide an insulating coating formed from the photocurable ink described above.

[0045] Thirdly, embodiments of this application also provide a battery casing, comprising:

[0046] Main body;

[0047] An insulating coating is disposed on at least a portion of the outer surface of the main body, and the insulating coating is formed from the photocurable ink as described above.

[0048] Fourthly, embodiments of this application also provide a method for preparing a battery casing, the method comprising:

[0049] The main body provides the battery casing;

[0050] Using the photocurable ink described above as a raw material, an ink layer is formed by spraying onto at least a portion of the outer surface of the main body;

[0051] The ink layer is cured by ultraviolet light to form an insulating coating, thus obtaining the battery casing.

[0052] In one embodiment, the thickness of the ink layer is 50 μm-150 μm; and / or

[0053] The ultraviolet light source includes an electrodeless lamp, and / or the wavelength of the ultraviolet light is 200nm-450nm, and / or the curing time is 1s-10s.

[0054] Fifthly, embodiments of this application also provide a battery, including the insulating coating as described above, or including the battery casing as described above, or a battery casing prepared using the method described above.

[0055] The beneficial effects of the embodiments of this application are as follows:

[0056] The photocurable ink of this application embodiment includes acrylic resin and reactive monomers. Acrylic resins, reactive monomers, and / or acrylic resins and reactive monomers can undergo photocuring reactions under light irradiation to generate polymers. The acrylic resins include polyester-type polyurethane acrylate resins and bisphenol-type epoxy acrylate resins, with a mass ratio of (3-6):1. The polyester-type polyurethane acrylate resin has polyester segments, which can improve the polymer's flexibility, high-temperature and high-humidity resistance, and chemical stability. The bisphenol-type epoxy acrylate resin has rigid structures such as benzene rings, which can improve the polymer's thermal shrinkage and electrical insulation properties. When the mass ratio of polyester-type polyurethane acrylate resin to bisphenol-type epoxy acrylate resin is less than 3:1, the content of polyester-type polyurethane acrylate resin is too low, while the content of bisphenol-type epoxy acrylate resin is too high. This results in excessive rigidity and low flexibility of the polymer, making the insulating coating formed by the UV-cured ink prone to brittleness and poor high-temperature and high-humidity resistance. When the mass ratio of polyester-type polyurethane acrylate resin to bisphenol-type epoxy acrylate resin is greater than 6:1, the content of polyester-type polyurethane acrylate resin is too high, while the content of bisphenol-type epoxy acrylate resin is too low. This results in excessive thermal shrinkage and low insulation properties of the polymer, making the insulating coating formed by the UV-cured ink prone to high-temperature shrinkage. Controlling the mass ratio of polyester-type polyurethane acrylate resin to bisphenol-type epoxy acrylate resin within the range of (3-6):1 allows the insulating coating to have both good flexibility and thermal shrinkage resistance, making it less prone to brittleness and thermal shrinkage, and improving the high-temperature resistance and mechanical properties of the insulating coating. Attached Figure Description

[0057] To more clearly illustrate the solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a graph showing the results of the cross-cut adhesion test after the aging treatment of the insulating coating in Example 1.

[0059] Figure 2 This is a graph showing the results of the cross-cut adhesion test after the insulation coating of Example 7 has undergone aging treatment;

[0060] Figure 3 This is a graph showing the results of the cross-cut adhesion test after the aging treatment of the insulating coating in Example 9.

[0061] Figure 4 The image shows the results of the cross-cut adhesion test after the insulation coating of Comparative Example 2 has undergone aging treatment.

[0062] Figure 5 The image shows the results of the cross-cut adhesion test after the insulation coating of Comparative Example 1 has undergone aging treatment. Detailed Implementation

[0063] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation; while "inner" and "outer" refer to the outline of the device.

[0064] In related technologies, insulating coatings are prone to brittleness and thermal shrinkage. Insulating coatings cannot simultaneously possess good high-temperature resistance and mechanical properties, and further improvements are needed.

[0065] This application provides a photocurable ink comprising acrylic resin and reactive monomers. Acrylic resins, reactive monomers, and / or acrylic resins and reactive monomers can undergo photocuring reactions under light irradiation to generate polymers. The acrylic resins include polyester-type polyurethane acrylate resins and bisphenol-type epoxy acrylate resins, with a mass ratio of (3-6):1. The polyester-type polyurethane acrylate resins have polyester segments, which can improve the polymer's flexibility, high-temperature and high-humidity resistance, and chemical stability. The bisphenol-type epoxy acrylate resins have rigid structures such as benzene rings, which can improve the polymer's thermal shrinkage and electrical insulation properties. When the mass ratio of polyester-type polyurethane acrylate resin to bisphenol-type epoxy acrylate resin is less than 3:1, the content of polyester-type polyurethane acrylate resin is too low, while the content of bisphenol-type epoxy acrylate resin is too high. This results in excessive rigidity and low flexibility of the polymer, making the insulating coating formed by the UV-cured ink prone to brittleness and poor high-temperature and high-humidity resistance. When the mass ratio of polyester-type polyurethane acrylate resin to bisphenol-type epoxy acrylate resin is greater than 6:1, the content of polyester-type polyurethane acrylate resin is too high, while the content of bisphenol-type epoxy acrylate resin is too low. This results in excessive thermal shrinkage and low insulation properties of the polymer, making the insulating coating formed by the UV-cured ink prone to high-temperature shrinkage. Controlling the mass ratio of polyester-type polyurethane acrylate resin to bisphenol-type epoxy acrylate resin within the range of (3-6):1 allows the insulating coating to have both good flexibility and thermal shrinkage resistance, making it less prone to brittleness and thermal shrinkage, and improving the high-temperature resistance and mechanical properties of the insulating coating.

[0066] In this embodiment, the mass ratio of polyester polyurethane acrylate resin and bisphenol epoxy acrylate resin can be any one or any two of 3:1, 4:1, 5:1, 6:1, etc., and is not limited here.

[0067] In this embodiment, the bisphenol type epoxy acrylate resin may include one or more of bisphenol A epoxy acrylate resin, bisphenol S epoxy acrylate resin, and bisphenol F epoxy acrylate resin, and is not limited herein.

[0068] In one embodiment, the mass percentage of acrylic resin in the UV-curable ink is 20%-40%; optionally, the mass percentage of acrylic resin in the UV-curable ink can be any one or any two of 20%, 25%, 30%, 35%, 40%, etc., and is not limited herein. In this embodiment, if the mass percentage of acrylic resin in the UV-curable ink is too high, it can easily lead to an increase in the viscosity of the UV-curable ink at room temperature, limiting the penetration of ultraviolet light into the UV-curable ink and resulting in poor curing effect; at the same time, it can easily lead to an increase in resin shrinkage stress, resulting in a decrease in the peel strength between the insulating coating and the battery casing body. If the mass percentage of acrylic resin in the UV-curable ink is too low, it can easily lead to a decrease in the electrical insulation performance, high temperature resistance, chemical stability, and mechanical properties of the insulating coating.

[0069] In one embodiment, the mass ratio of reactive monomer to acrylic resin is (1.2-3.5):1. Optionally, the mass ratio of reactive monomer to acrylic resin can be any one or any two of 1.2:1, 1.5:1, 1.8:1, 2.0:1, 2.5:1, 3.0:1, 3.2:1, 3.5:1, etc., and is not limited herein. In this embodiment, if the mass ratio of reactive monomer to acrylic resin is too large, it is easy to result in an excessive amount of reactive monomer and an insufficient amount of acrylic resin. Excessive reactive monomer can easily reduce the crosslinking density of acrylic resin. In addition, the more reactive monomer there is, the higher the UV energy required for complete curing. Under limited UV energy, excessive reactive monomer can easily lead to incomplete curing, resulting in a decrease in the mechanical properties, high-temperature resistance, and electrical insulation properties of the insulating coating. If the mass ratio of active monomer to acrylic resin is too small, it can easily lead to insufficient content of active monomer and excessive content of acrylic resin. This increases the viscosity of the UV-curable ink at room temperature, restricts the penetration of ultraviolet light into the UV-curable ink, and results in poor curing effect. At the same time, it can easily lead to increased resin shrinkage stress, resulting in reduced peel strength between the insulating coating and the main body of the battery casing.

[0070] In one embodiment, the molecular weight of the polyester-type polyurethane acrylate resin is 1000-1500; optionally, the molecular weight of the polyester-type polyurethane acrylate resin can be any one or any two of 1000, 1100, 1200, 1300, 1400, 1500, etc., and is not limited herein. In this embodiment, the molecular weight of the polyester-type polyurethane acrylate resin is set to 1000-1500 so that the UV-curable ink has a suitable viscosity, reducing ink tailing, clogging, and other phenomena when spraying the UV-curable ink.

[0071] In one embodiment, the molecular weight of the bisphenol-type epoxy acrylate resin is 1000-1500; optionally, the molecular weight of the bisphenol-type epoxy acrylate resin can be any one or any two of 1000, 1100, 1200, 1300, 1400, 1500, etc., and is not limited herein. In this embodiment, the molecular weight of the bisphenol-type epoxy acrylate resin is set to 1000-1500 so that the UV-curable ink has a suitable viscosity, reducing ink tailing and clogging during UV-curable ink spraying.

[0072] In one embodiment, the polyester-type polyurethane acrylate resin has the general structural formula shown in formula (1):

[0073]

[0074] In this embodiment, the polyester-type polyurethane acrylate resin has polyester segments, which can improve the polymer's flexibility, high temperature and humidity resistance, and chemical stability. In addition, the polyester-type polyurethane acrylate resin has multiple polar groups such as carbonyl and alkoxy groups, which can form chemical bonds or van der Waals forces with the main body of the battery casing, thereby improving the adhesion of the insulating coating.

[0075] In one embodiment, in structural formula (1), R2, R5, and R6 are each independently selected from alkyl groups of C1-C6, and / or R4 is selected from hexamethylene or isophorone groups, and / or m is selected from integers of 2-10.

[0076] In one embodiment, the polyester-type polyurethane acrylate resin of structural formula (1) can be prepared by the following method:

[0077] S11. A polyester polyol having the structure shown in Formula 1 and an isocyanate having the structure shown in Formula 2 are added to a reactor containing acetone solvent and mixed thoroughly to obtain a first mixture. Dibutyltin dilaurate and triethylenediamine are added to the first mixture as catalysts, and a polycondensation reaction is carried out at an ambient temperature of 60℃-80℃ for 4-12 hours to obtain the compound shown in Formula 3. The molar ratio of polyester polyol to isocyanate is 2:1, and the mass percentage of the catalyst in the first mixture is 0.1%-0.5%. The reaction formula is as follows:

[0078]

[0079] S12. Add an acrylate with the structure shown in Formula 4 to a reactor vessel and continue the reaction at an ambient temperature of 60℃-80℃ for 4h-12h to obtain a polyester-type polyurethane acrylate resin with the structural formula (1); wherein the molar ratio of acrylate to polyester polyol is 2:1. The reaction formula is as follows:

[0080]

[0081] In this embodiment, the polyester polyol may include at least one of adipic acid-based polyester polyol, sebacic acid-based polyester polyol, terephthalic acid-based polyester polyol, and phthalic acid-based polyester polyol; the isocyanate may include at least one of isophorone diisocyanate and hexamethylene diisocyanate.

[0082] In one embodiment, the bisphenol type epoxy acrylate resin has the general structural formula shown in structural formula (2):

[0083]

[0084] In this embodiment, the bisphenol type epoxy acrylate resin has a rigid structure such as benzene rings, which can improve the polymer's thermal shrinkage and electrical insulation properties.

[0085] In one embodiment, in structural formula (2), R1 is selected from hydrogen or C1-C6 alkyl groups, and / or n is selected from integers from 2 to 10.

[0086] In one embodiment, the bisphenol type epoxy acrylate resin represented by structural formula (2) can be prepared by the following method:

[0087] S21. Bisphenol A and epichlorohydrin are added to a reactor vessel containing acetone solvent and mixed thoroughly to obtain a first mixture. Sodium hydroxide is added to the first mixture as a catalyst, and a polycondensation reaction is carried out at an ambient temperature of 50℃-100℃ for 2-12 hours to obtain the compound shown in Formula 5. The molar ratio of bisphenol A to epichlorohydrin is 2:3, and the mass percentage of the catalyst in the first mixture is 0.1%-1%. The reaction formula is as follows:

[0088]

[0089] S22. Add triethylamine catalyst and an acrylic compound with the structure shown in Formula 6 to a reactor vessel, and react at an ambient temperature of 25℃-80℃ for 2h-12h to obtain a bisphenol type epoxy acrylate resin with structural formula (2); wherein the molar ratio of acrylic acid to bisphenol A is 2:1. The reaction formula is as follows:

[0090]

[0091] In one embodiment, the mass percentage of the active monomer in the UV-curable ink is 50%-70%. Optionally, the mass percentage of the active monomer in the UV-curable ink can be any one or any two of 50%, 55%, 60%, 65%, 70%, etc., and is not limited herein. In this embodiment, if the mass percentage of the active monomer in the UV-curable ink is too high, the excessive active monomer can easily reduce the crosslinking density of the acrylic resin, leading to a decrease in the mechanical properties of the insulating coating; in addition, the more active monomers there are, the higher the UV energy required for complete curing, and with limited UV energy, too much active monomer can easily lead to incomplete curing. Active monomers can reduce the viscosity of the UV-curable ink. If the mass percentage of the active monomer in the UV-curable ink is too low, the viscosity of the UV-curable ink can easily increase, limiting the penetration of ultraviolet light into the UV-curable ink, resulting in poor curing effect.

[0092] In one embodiment, the active monomers include monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers, wherein the functionality of the polyfunctional acrylate monomers is greater than or equal to 3. In this embodiment, monofunctional acrylate monomers can increase the flexibility and adhesion of the insulating coating, while difunctional and polyfunctional acrylate monomers can improve the electrical insulation, electrolyte resistance, and crosslinking density of the insulating coating. The combined use of monofunctional, difunctional, and polyfunctional acrylate monomers can produce a synergistic effect, improving the flexibility, electrical insulation, solvent resistance, and adhesion of the insulating coating.

[0093] In one embodiment, the mass ratio of monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers is (4-6):1:(0.1-0.4). Optionally, the mass ratio of monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers can be any one or any two of 4:1:0.4, 4:1:0.3, 4:1:0.2, 4:1:0.1, 6:1:0.1, etc., and is not limited herein. In this embodiment, when the mass of monofunctional acrylate monomers is too high and the mass of polyfunctional acrylate monomers is too low, it is easy to lead to a low crosslinking density and poor high-temperature resistance of the insulating coating. When the mass of monofunctional acrylate monomers is too low and the mass of polyfunctional acrylate monomers is too high, it is easy to lead to incomplete curing of the insulating coating, stickiness of the insulating coating, easy cracking of the insulating coating, and poor aging resistance.

[0094] In one embodiment, the monofunctional acrylate monomer includes at least one of isobornyl acrylate, isodecyl acrylate, lauryl acrylate, or hexadecyl acrylate.

[0095] In one embodiment, the bifunctional acrylate monomer includes at least one of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, and ethoxylated bisphenol A diacrylate.

[0096] In one embodiment, the multifunctional acrylate monomer includes at least one of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol penta / hexaacrylate, and tri(2-hydroxyethyl)isocyanurate triacrylate.

[0097] In one embodiment, the photocurable ink further includes an initiator, pigment, additives, and / or diluent.

[0098] In one embodiment, the initiator includes a deep-curing initiator, a thioxanthone initiator, and an amine initiator, with the deep-curing initiator having an absorption wavelength of 300 nm-400 nm. The initiator promotes the polymerization reaction between the polymer monomer and the acrylic resin, thereby enabling the photocurable ink to cure. Generally, the longer the wavelength of light, the better its ability to penetrate materials. Therefore, inks in deeper regions typically require longer wavelengths of light for photocuring. Since the deep-curing initiator has an absorption wavelength of 300 nm-400 nm, it can absorb and match longer wavelengths of light, ensuring that the deep-curing initiator can be effectively activated to generate free radicals even in deeper regions, thus achieving deep curing. 。 Thioxanthone initiators, due to their high absorption efficiency and rapid initiation capability, can meet the requirements of surface curing. Thioxanthone initiators form an excited state under light irradiation. The electron-rich sulfur atoms in the thioxanthone initiator molecule enhance the molecule's light absorption capacity, enabling efficient generation of the excited state. The excited-state thioxanthone initiator, through intramolecular hydrogen abstraction, abstracts hydrogen atoms from the amine initiator, generating active free radicals and amine free radicals. The amine free radicals can react with oxygen to generate peroxide amines, thereby consuming oxygen in the surface region and reducing oxygen interference with surface curing. This allows the surface region to complete surface curing before oxygen diffuses to the reaction interface, improving oxygen inhibition and enhancing the surface curing effect of the insulating coating. During the curing of photocurable inks, both surface and underlying curing can be achieved simultaneously.

[0099] In one embodiment, the initiator's mass percentage in the UV-curable ink is 2%-5%. Optionally, the mass percentage of the initiator in the UV-curable ink can be any one or any two of 2%, 2.5%, 3%, 3.5%, 4%, 5%, etc., and is not limited herein. In this embodiment, when the initiator content is too high, it can easily lead to an excessively rapid curing reaction, which can easily cause internal stress or cracks in the insulating coating. When the initiator content is too low, it can easily lead to incomplete curing, affecting the mechanical strength and durability of the insulating coating.

[0100] In one embodiment, the total mass percentage of the thioxanthone initiator and the amine initiator in the UV-curable ink is 1%-3%. Optionally, the total mass percentage of the thioxanthone initiator and the amine initiator in the UV-curable ink can be any one or any two of 1%, 1.5%, 2%, 2.5%, 3%, etc., and is not limited herein. In one embodiment, when the total mass percentage of the thioxanthone initiator and the amine initiator is too high, it can easily lead to excessively rapid curing of the ink surface, forming an uneven surface. Defects such as orange peel and pinholes may appear on the surface of the insulating coating, affecting the appearance and performance of the insulating coating. When the total mass percentage of the thioxanthone initiator and the amine initiator is too low, it can easily lead to incomplete curing of the ink surface.

[0101] In one embodiment, the mass ratio of the thioxanthone initiator to the amine initiator is 1:(0.2-0.5). Optionally, the mass ratio of the thioxanthone initiator to the amine initiator can be any one or any two of 1:0.2, 1:0.3, 1:0.4, 1:0.5, etc., and is not limited herein. In this embodiment, the thioxanthone initiator mainly promotes ink curing by generating free radicals with the amine initiator through a hydrogen abstraction reaction. When the mass ratio of the thioxanthone initiator to the amine initiator is too low, it is easy to result in too few free radicals generated by the thioxanthone initiator, and the amine initiator alone has low initiation efficiency, resulting in slower curing speed and incomplete surface curing. When the mass ratio of the thioxanthone initiator to the amine initiator is too high, it is easy to result in too low amine initiator content, and the effect of the amine initiator in improving oxygen inhibition is not ideal.

[0102] In one embodiment, the mass percentage of the deep-curing initiator in the UV-curable ink is 2%-5%. Optionally, the mass percentage of the deep-curing initiator in the UV-curable ink can be any one or any two of 2%, 2.5%, 3%, 3.5%, 5%, etc., and is not limited herein. In this embodiment, when the mass percentage of the deep-curing initiator in the UV-curable ink is too high or too low, it can easily lead to a problem of poor consistency between the surface and deep curing degrees of the insulating coating.

[0103] In one embodiment, the deep curing initiator includes at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, bis(1-(2,4-difluorophenyl)-3-pyrrolithyl)dicenzolide, bis(2,6-difluoro-3-pyrrolithyl)dicenzolide, 2-hydroxy-2-methyl-1-phenylpropanone, and 1-hydroxycyclohexylphenyl methyl ketone.

[0104] In one embodiment, the thioxanthone initiator includes at least one of 2-chlorothioxanthone, isopropylthioxanthone, and 2,4-diethylthioxanthone.

[0105] In one embodiment, the amine initiator includes at least one of an active amine and a tertiary amine benzoate.

[0106] In one embodiment, the active amine includes at least one selected from ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, diethylamine, triethylamine, isophorone diamine, and 1,2-cyclohexanediamine.

[0107] In one embodiment, the tertiary amine benzoate includes at least one of ethyl 4-(N,N-dimethylamino)benzoate, ethyl N,N-diphenylmethylformate, and 2-ethylhexyl N,N-dimethylbenzoate.

[0108] In one embodiment, the additives include wetting agents and adhesion agents, which can improve the spreadability and anti-cratering properties of the UV-curable ink.

[0109] In one embodiment, the mass percentage of the additive in the UV-curable ink is 1%-3%; optionally, the mass percentage of the additive in the UV-curable ink can be any one or any two of 1%, 1.5%, 2%, 2.5%, 3%, etc., and is not limited herein.

[0110] In one embodiment, the wetting agent includes at least one of polyether-modified silicone and polyester-modified silicone.

[0111] In one embodiment, the adhesive includes at least one of phosphate-modified acrylate and silane-modified polymer.

[0112] In one embodiment, the mass percentage of the diluent in the ink is 4%-5%. Optionally, the mass percentage of the diluent in the UV-curable ink can be any one or any two of 4%, 4.2%, 4.6%, 4.8%, 5%, etc., and is not limited herein.

[0113] In one embodiment, the diluent includes at least one of isoborneol acrylate, isodecyl acrylate, lauryl acrylate, or hexadecyl acrylate.

[0114] In one embodiment, the pigment in the UV-curable ink is 0.5%-1% by mass. Optionally, the pigment in the UV-curable ink may be any one or any two of 0.5%, 0.6%, 0.7%, 0.8%, 1%, etc., and is not limited herein.

[0115] In one embodiment, the pigment particle size D50 is ≤0.4 μm.

[0116] In one embodiment, the pigment includes at least one of phthalocyanine blue powder, phthalocyanine green powder, and titanium dioxide.

[0117] This application also provides a method for preparing a photocurable ink, comprising: adding raw materials such as acrylic resin and active monomers into a double planetary mixer and dispersing them at 500r / min-1000r / min for 0.5h-1h to obtain the photocurable ink.

[0118] This application also provides an insulating coating formed from the photocurable ink described above.

[0119] This application also provides a battery casing, including a main body and an insulating coating. The insulating coating is disposed on at least a portion of the outer surface of the main body and is formed by the photocurable ink described above. In this embodiment, the main body can be made of a material with a certain hardness and strength. The main body can be made of materials such as copper, iron, aluminum, stainless steel, and aluminum alloy, and is not limited thereto. The shape of the main body is also not limited; the shape of the main body can be cuboid, cylindrical, hexagonal prism, etc., and is not limited thereto.

[0120] This application also provides a method for preparing a battery casing, comprising:

[0121] S01, A main body providing a battery casing;

[0122] S02. Using the photocurable ink as described above as raw material, an ink layer is formed by spraying it onto at least a portion of the outer surface of the main body.

[0123] S03. The ink layer is cured by ultraviolet light to form an insulating coating, thus obtaining the battery casing.

[0124] In this embodiment, an ink layer is sprayed onto the surface of the main body using a spraying process, and then cured by ultraviolet light. The ink layer can be cured in situ on the surface of the main body, which can improve the adhesion of the insulating coating to the main body. At the same time, the insulating coating has good flexibility and thermal shrinkage resistance, and the insulating coating is not prone to brittleness and thermal shrinkage.

[0125] In one embodiment, the thickness of the ink layer is 50μm-150μm; optionally, the thickness of the ink layer can be any one or any two of 50μm, 80μm, 100μm, 120μm, 150μm, etc., and is not limited herein.

[0126] In one embodiment, the light source for the ultraviolet light includes an electrodeless lamp, and / or the wavelength of the ultraviolet light is 200nm-450nm, and / or the curing time is 1s-10s.

[0127] This application also provides a battery, including the insulating coating as described above, or including the battery casing as described above, or a battery casing prepared using the method described above. In this embodiment, the type of battery is not limited; the battery may be a lithium-ion battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery.

[0128] The present application will be further described below through specific embodiments.

[0129] Example 1

[0130] This embodiment provides a photocurable ink, which includes acrylic resin, reactive monomers, initiators, pigments, additives, and diluents; wherein:

[0131] The acrylic resin in the UV-curable ink is 25% by mass. The acrylic resin is composed of polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin, and the mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 4:1.

[0132] The active monomer in the photocurable ink has a mass percentage of 64.5%. The active monomer is composed of isobornyl acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate, and the mass ratio between isobornyl acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate is 4:1:0.2.

[0133] The initiator accounts for 3% of the mass of the photocurable ink and is composed of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 2-chlorothionone, and ethylenediamine.

[0134] The pigment in the UV-curable ink is 0.5% by mass, and the pigment is titanium dioxide.

[0135] The additives constitute 2% by mass in the UV-curable ink, and include polyether-modified silicone and phosphate-modified acrylate.

[0136] The diluent in the UV-curable ink is 5% by mass, and the diluent is lauryl acrylate.

[0137] Example 2

[0138] The main difference between Example 2 and Example 1 is:

[0139] The mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 3:1; the rest is the same as in Example 1.

[0140] Example 3

[0141] The main difference between Example 3 and Example 1 is:

[0142] The mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 6:1; the rest is the same as in Example 1.

[0143] Example 4

[0144] The main difference between Example 4 and Example 1 is:

[0145] The mass ratio of isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate is 4:1:0.4; the rest is the same as in Example 1.

[0146] Example 5

[0147] The main difference between Example 5 and Example 1 is:

[0148] The mass ratio of isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate is 6:1:0.1; the rest is the same as in Example 1.

[0149] Example 6

[0150] The main difference between Example 6 and Example 1 is:

[0151] The active monomers consist of isodecyl acrylate, ethoxylated bisphenol A diacrylate, and propoxylated trimethylolpropane triacrylate; the rest are the same as in Example 1.

[0152] Example 7

[0153] The main difference between Example 7 and Example 1 is:

[0154] The acrylic resin in the UV-curable ink is 20% by mass. The acrylic resin is composed of polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin, and the mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 3:1.

[0155] The active monomer accounts for 70% by mass in the photocurable ink. The active monomer is composed of isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate, with a mass ratio of 4:1:0.4 between isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate.

[0156] The diluent accounts for 4.5% by mass in the UV-curable ink;

[0157] The rest is the same as in Example 1.

[0158] Example 8

[0159] The main difference between Example 8 and Example 1 is:

[0160] The acrylic resin accounts for 40% of the mass of the UV-curable ink. The acrylic resin is composed of polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin, and the mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 6:1.

[0161] The active monomer in the photocurable ink has a mass percentage of 50%. The active monomer is composed of isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate, and the mass ratio between isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate is 6:1:0.1.

[0162] The diluent accounts for 4.5% by mass in the UV-curable ink;

[0163] The rest is the same as in Example 1.

[0164] Example 9

[0165] The main difference between Example 9 and Example 1 is:

[0166] The mass ratio of isoborneol acrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate is 4:1:0.6; the rest is the same as in Example 1.

[0167] Example 10

[0168] The main difference between Example 10 and Example 1 is:

[0169] The active monomer is composed of isoborneol acrylate and 1,6-hexanediol diacrylate, with a mass ratio of isoborneol acrylate to 1,6-hexanediol diacrylate of 4:1; the rest is the same as in Example 1.

[0170] Example 11

[0171] The main difference between Example 11 and Example 1 is:

[0172] The active monomer in the UV-curable ink is 18.6% by mass, and the acrylic resin in the UV-curable ink is 70.9% by mass; the rest is the same as in Example 1.

[0173] Example 12

[0174] The main difference between Example 12 and Example 1 is:

[0175] The active monomer in the UV-curable ink has a mass percentage of 42.8%, and the acrylic resin in the UV-curable ink has a mass percentage of 46.7%; the rest is the same as in Example 1.

[0176] Comparative Example 1

[0177] The main difference between Comparative Example 1 and Example 1 is:

[0178] The mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 2:1; the rest is the same as in Example 1.

[0179] Comparative Example 2

[0180] The main difference between Comparative Example 2 and Example 1 is:

[0181] The mass ratio between polyester polyurethane acrylate resin and bisphenol A epoxy acrylate resin is 7:1; the rest is the same as in Example 1.

[0182] Comparative Example 3

[0183] A 100μm thick PET blue film was used instead of the insulating coating.

[0184] Test method:

[0185] The photocurable inks of Examples 1 to 12 and Comparative Examples 1 to 2 were sprayed onto aluminum sheets. An electrodeless lamp was used as the light source, the wavelength of the ultraviolet light was 400 nm, and the curing time was 8 s to obtain an insulating coating with a thickness of 100 μm.

[0186] (1) Cross-cut adhesion test

[0187] Referring to the method of GB / T 9286-2021, the insulating coatings obtained in Examples 1 to 12 and Comparative Examples 1 to 2, and the PET blue film of Comparative Example 3, were adhered to the surface of a 150×100mm aluminum plate and placed on a horizontal rigid plane. A cross-cutting tool was used to cut perpendicular to the sample, ensuring all cuts penetrated to the substrate surface. Subsequently, the same number of cuts were made in a direction intersecting the original cut lines at 90° to form a grid. Then, a soft brush was used to sweep the surface several times, and transparent tape was applied over the grid, flattened, and then peeled off. The adhesion of the bonding insulating coating was assessed according to the adhesion grading table, where Grade 0 indicates no coating peeling on the grid; Grade 1 indicates coating peeling area ≤ 5% on the grid; Grade 2 indicates coating peeling area 5%-15% on the grid; Grade 3 indicates coating peeling area 15%-35% on the grid; Grade 4 indicates coating peeling area 35%-65% on the grid; and Grade 5 indicates coating peeling area > 65% on the grid. The test results are shown in Table 1.

[0188] (2) Shear strength test

[0189] The insulating coatings obtained in Examples 1 to 12 and Comparative Examples 1 to 2, and the PET blue film in Comparative Example 3 were subjected to shear strength tests according to the method in GB / T 7124-2008. The test results are shown in Table 1.

[0190] (3) Insulation resistance test

[0191] The insulation performance of the insulating coatings obtained in Examples 1 to 12 and Comparative Examples 1 to 2, and the PET blue film in Comparative Example 3 were tested using an insulation withstand voltage tester at DC 1500V for 60 seconds. The insulation resistance was measured. The test results are shown in Table 1.

[0192] (4) High temperature resistance test

[0193] The insulating coatings obtained in Examples 1 to 12 and Comparative Examples 1 to 2, as well as the PET blue film in Comparative Example 3, were subjected to high-temperature resistance tests: the test temperature was 130°C, and the test time was 48 hours. The samples were observed to detect any abnormalities such as shrinkage, peeling, or cracking. The test results are shown in Table 1.

[0194] (5) Withstand voltage test

[0195] The insulating coatings obtained in Examples 1 to 12 and Comparative Examples 1 to 2, and the PET blue film in Comparative Example 3 were subjected to withstand voltage tests using an insulation withstand voltage tester. The test conditions were DC 4000V, the test time was 60s, and the leakage current was ≤0.1mA. The test results are shown in Table 1.

[0196] (5) Aging test

[0197] The insulating coatings obtained in Examples 1 to 12 and Comparative Examples 1 to 2, as well as the PET blue film of Comparative Example 3, were subjected to aging treatment using a constant temperature and humidity chamber. The aging temperature was 85°C, the relative humidity was 85%, and the aging time was 2000 hours. The presence of cracks or peeling in the insulating coatings after aging was observed. Simultaneously, the shear strength, adhesion, withstand voltage, and insulation resistance of the aged insulating coatings were tested. The test results are shown in Table 2 and... Figures 1-5 As shown; where, Figure 1 This is a graph showing the results of the cross-cut adhesion test after the aging treatment of the insulating coating in Example 1. Figure 2 This is a graph showing the results of the cross-cut adhesion test after the insulation coating of Example 7 has undergone aging treatment; Figure 3 This is a graph showing the results of the cross-cut adhesion test after the aging treatment of the insulating coating in Example 9. Figure 4 The image shows the results of the cross-cut adhesion test after the insulation coating of Comparative Example 2 has undergone aging treatment. Figure 5 The image shows the results of the cross-cut adhesion test after the insulation coating of Comparative Example 1 has undergone aging treatment.

[0198] Table 1:

[0199]

[0200]

[0201] Table 2:

[0202]

[0203]

[0204] As can be seen from the test results of Examples 1 to 12 and Comparative Examples 1 to 3 above, the insulating coatings prepared in Examples 1 to 12 had a cross-cut adhesion grade of 0 before aging treatment, a shear strength greater than or equal to 8.6 MPa, and no shrinkage after high-temperature treatment. The insulating coatings of the embodiments of this application have both good high-temperature resistance and mechanical properties. The reason is that UV-curable inks include acrylic resins and reactive monomers. Acrylic resins include polyester-type polyurethane acrylate resins and bisphenol-type epoxy acrylate resins, and the mass ratio of polyester-type polyurethane acrylate resins to bisphenol-type epoxy acrylate resins is (3-6):1. Polyester-type polyurethane acrylate resins have polyester segments, which can improve the polymer's flexibility, high temperature and humidity resistance, and chemical stability. Bisphenol-type epoxy acrylate resins have rigid structures such as benzene rings, which can improve the polymer's thermal shrinkage and electrical insulation properties. By controlling the mass ratio of polyester-type polyurethane acrylate resins to bisphenol-type epoxy acrylate resins within the range of (3-6):1, the insulating coating can simultaneously have good flexibility and thermal shrinkage resistance, making the insulating coating less prone to brittleness and thermal shrinkage, thus improving the high temperature resistance and mechanical properties of the insulating coating.

[0205] A comparison of Examples 1-8 and Example 10 shows that the active monomers include monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers. The polyfunctional acrylate monomers have a functionality greater than or equal to 3, which can further improve the adhesion, shear strength, insulation performance, voltage resistance, high temperature resistance, and aging performance of the insulating coating. This results in the insulating coating having good mechanical properties, insulation performance, voltage resistance, and high temperature resistance both before and after aging treatment.

[0206] A comparison of Examples 1-8 and Example 9 shows that controlling the mass ratio of monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers within an appropriate range can further improve the adhesion, shear strength, high-temperature resistance, and aging performance of the insulating coating, resulting in good mechanical properties and high-temperature resistance of the insulating coating both before and after aging treatment.

[0207] A comparison of Examples 1-8 and Examples 11-12 shows that controlling the mass percentage of active monomers in the photocurable ink within an appropriate range can further improve the adhesion, shear strength, insulation performance, voltage resistance, high temperature resistance, and aging performance of the insulating coating. This results in the insulating coating exhibiting good mechanical properties, insulation performance, voltage resistance, and high temperature resistance both before and after aging treatment.

[0208] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A photocurable ink, characterized in that, include: Acrylic resins and reactive monomers; The acrylic resin includes polyester-type polyurethane acrylate resin and bisphenol-type epoxy acrylate resin, and the mass ratio of the polyester-type polyurethane acrylate resin to the bisphenol-type epoxy acrylate resin is (3-6):1; The acrylic resin in the UV-curable ink comprises 20%-40% by mass. The active monomer in the photocurable ink has a mass percentage of 50%-70%; The active monomers include monofunctional acrylate monomers, difunctional acrylate monomers, and polyfunctional acrylate monomers, and the mass ratio between the monofunctional acrylate monomers, the difunctional acrylate monomers, and the polyfunctional acrylate monomers is (4-6):1:(0.1-0.4).

2. The photocurable ink according to claim 1, characterized in that, The bisphenol type epoxy acrylate resin includes one or more of bisphenol A epoxy acrylate resin, bisphenol S epoxy acrylate resin, and bisphenol F epoxy acrylate resin; and / or The mass ratio of the active monomer to the acrylic resin is (1.2-3.5):1; and / or The functionality of the multifunctional acrylate monomer is greater than or equal to 3; and / or The molecular weight of the polyester-type polyurethane acrylate resin is 1000-1500; and / or The bisphenol type epoxy acrylate resin has a molecular weight of 1000-1500; and / or The polyester-type polyurethane acrylate resin has the general structural formula shown in formula (1): Structural formula (1); and / or The bisphenol type epoxy acrylate resin has the general structural formula shown in formula (2): Structural formula (2).

3. The photocurable ink according to claim 2, characterized in that, In the structural formula (1), R2, R5, and R6 are each independently selected from C1-C6 alkyl groups, and / or R4 is selected from hexamethylene or isophorone groups, and / or m is selected from integers from 2 to 10; and / or In the structural formula (2), R1 is selected from hydrogen or C1-C6 alkyl groups, and / or n is selected from integers from 2 to 10; and / or The monofunctional acrylate monomers include at least one of isobornyl acrylate, isodecyl acrylate, lauryl acrylate, or hexadecyl acrylate; and / or The bifunctional acrylate monomers include at least one of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, and ethoxylated bisphenol A diacrylate; and / or The multifunctional acrylate monomers include at least one of trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol penta / hexaacrylate, and tri(2-hydroxyethyl)isocyanurate triacrylate.

4. The photocurable ink according to any one of claims 1-3, characterized in that, The photocurable ink also includes initiators, pigments, additives and / or diluents.

5. The photocurable ink according to claim 4, characterized in that, The initiator includes a deep-curing initiator, a thioxanthone initiator, and an amine initiator, wherein the absorption wavelength of the deep-curing initiator is 300 nm-400 nm; and / or The additives include wetting agents and adhesion agents; and / or The diluent includes at least one of isoborneol acrylate, isodecyl acrylate, lauryl acrylate, or hexadecyl acrylate.

6. The photocurable ink according to claim 4, characterized in that, The initiator in the photocurable ink has a mass percentage of 2%-5%; and / or The pigment in the photocurable ink has a mass percentage of 0.5%-1%; and / or The additive is present in the UV-curable ink at a mass percentage of 1%-3%; and / or The diluent in the UV-curable ink has a mass percentage of 4%-5%; and / or The pigment has a particle size D50 ≤ 0.4 μm.

7. The photocurable ink according to claim 5, characterized in that, The deep curing initiator comprises at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, bis(1-(2,4-difluorophenyl)-3-pyrrolithyl)dicenzolide, bis2,6-difluoro-3-pyrrolithyldicenzolide, 2-hydroxy-2-methyl-1-phenylpropanone, and 1-hydroxycyclohexylphenyl ketone; and / or The thioxanthone initiator includes at least one of 2-chlorothioxanthone, isopropylthioxanthone, and 2,4-diethylthioxanthone; and / or The amine initiator includes at least one of an active amine and a tertiary amine benzoate; and / or The wetting agent includes at least one of polyether-modified silicone and polyester-modified silicone; and / or The adhesive comprises at least one of phosphate-modified acrylate and silane-modified polymer; and / or The deep curing initiator in the photocurable ink has a mass percentage of 2%-5%; and / or The sum of the masses of the thioxanthone initiator and the amine initiator constitutes 1%-3% of the mass percentage of the photocurable ink; and / or The mass ratio between the thioxanthone initiator and the amine initiator is 1:(0.2-0.5).

8. The photocurable ink according to claim 7, characterized in that, The active amine includes at least one selected from ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, diethylamine, triethylamine, isophorone diamine, and 1,2-cyclohexanediamine; and / or The tertiary amine benzoate includes at least one of ethyl 4-(N,N-dimethylamino)benzoate, ethyl N,N-diphenylmethylformate, and 2-ethylhexyl N,N-dimethylbenzoate.

9. An insulating coating, characterized in that, The insulating coating is formed from the photocurable ink according to any one of claims 1-8.

10. A battery casing, characterized in that, include: Main body; An insulating coating is disposed on at least a portion of the outer surface of the main body, the insulating coating being formed from the photocurable ink according to any one of claims 1-8.

11. A method for preparing a battery casing, characterized in that, The method for preparing the battery casing includes: The main body provides the battery casing; Using the photocurable ink according to any one of claims 1-8 as raw material, an ink layer is formed by spraying onto at least a portion of the outer surface of the main body; The ink layer is cured by ultraviolet light to form an insulating coating, thus obtaining the battery casing.

12. The method for preparing the battery casing according to claim 11, characterized in that, The thickness of the ink layer is 50μm-150μm; and / or The ultraviolet light source includes an electrodeless lamp, and / or the wavelength of the ultraviolet light is 200nm-450nm, and / or the curing time is 1s-10s.

13. A battery, characterized in that, It includes the insulating coating as described in claim 9, or the battery casing as described in claim 10, or a battery casing prepared using the method described in claim 11 or 12.

Images