Waterproof material and preparation method thereof, battery and electric device

Abstract

The invention discloses a waterproof material and a preparation method thereof, a battery and an electric device. The invention relates to the technical field of batteries, in particular to a waterproof material and a preparation method thereof, a battery and an electric device. The waterproof material comprises the following raw materials: nylon, glass fibers, linear phenolic resin, an antioxidant and a lubricant. The linear phenolic resin is added into the material composed of the nylon and the glass fiber, hydroxyl in the linear phenolic resin and amido bonds in the nylon are utilized to form hydrogen bonds, the bonding proportion of the amido bonds and water is reduced, the water absorption rate of the material is reduced, meanwhile, the heat resistance and stability of the material are improved through a benzene ring structure in the linear phenolic resin, and the service life of the material is prolonged. Meanwhile, due to the addition of the glass fibers, the impact resistance of the material can be ensured, and the cost of the material can be reduced at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to waterproof materials and their preparation methods, batteries, and electrical devices. Background Art

[0002] The housing of a battery usually works under complex working conditions such as high temperature, low temperature, high humidity environments, or bumpy road conditions, providing support and protection for the battery cells.

[0003] Therefore, in order to reduce the impact of the environment on the battery cells, higher requirements are put forward for the battery housing. Especially in a high humidity environment, reducing the impact of moisture on the battery cells has become an important factor affecting the battery life. Therefore, the waterproof performance of the battery housing material is particularly important.

[0004] However, the current battery housing materials are difficult to meet the requirements in terms of waterproof performance, impact resistance, and cost. Summary of the Invention

[0005] The present application is made in view of the above problems, and its purpose is to provide a waterproof material that can improve the waterproof performance and impact resistance while reducing the cost.

[0006] To achieve the above purpose, the embodiments of the present application provide a waterproof material and its preparation method, a battery, and an electrical device.

[0007] In a first aspect, the embodiments of the present application propose a waterproof material, including the following raw materials: nylon, glass fiber, linear phenolic resin, antioxidant, and lubricant.

[0008] Thus, in the technical solution of the embodiments of the present application, by adding linear phenolic resin to the material composed of nylon and glass fiber, the hydroxyl group in the linear phenolic resin forms a hydrogen bond with the amide bond in the nylon, reducing the proportion of the amide bond combined with water, thereby reducing the water absorption rate of the material. At the same time, the benzene ring structure in the linear phenolic resin is used to improve the heat resistance and stability of the material, reducing the cost of the material. At the same time, the addition of glass fiber can ensure the impact resistance of the material while reducing the cost of the material.

[0009] In any embodiment, the hydroxyl equivalent of the linear phenolic resin is 80 to 180 g / eq; the linear phenolic resin within this hydroxyl equivalent range can enable sufficient phenolic hydroxyl groups to form hydrogen bonds with the nylon terminal amino groups, reduce the water absorption rate caused by the combined water between the carboxyl groups and amino groups, and reduce the cost of the waterproof material. Optionally, the hydroxyl equivalent of the linear phenolic resin is 103 to 107 g / eq. It should be noted that within the range of 80 to 180 g / eq of the hydroxyl equivalent of the linear phenolic resin, the melt viscosity of the linear phenolic resin at 150 °C can be 25 to 45 Pa·s. Among them, the melt viscosity refers to the viscosity in the state of heating and melting or dissolving, which is measured by a viscometer or viscosimeter and directly affects the fluidity of the resin.

[0010] In any embodiment, the linear phenolic resin includes at least one of linear phenol formaldehyde resin, linear bisphenol A formaldehyde resin, and linear o-cresol formaldehyde resin. By using at least one of the above linear phenolic resins, the terminal hydroxyl groups of the linear phenolic resin can hinder the combination of amide bonds and water, and reduce the water absorption rate of polyamide.

[0011] In any embodiment, the mass ratio of the linear phenolic resin to the nylon is 1:(1.5 to 40). At this mass ratio, there are sufficient hydroxyl groups in the linear phenolic resin to form hydrogen bonds with the amide bonds in the nylon, further reducing the proportion of amide bonds combined with water, further reducing the water absorption rate of the material, further improving the heat resistance and stability of the material, and further improving the impact resistance of the material; optionally, the mass ratio of the linear phenolic resin to the nylon is 1:(3 to 15).

[0012] In any embodiment, by mass, the waterproof material includes the following raw materials:

[0013] 30 to 80 parts of nylon, optionally 45 to 65 parts of nylon;

[0014] 10 to 50 parts of glass fiber, optionally 25 to 35 parts of glass fiber;

[0015] 2 to 20 parts of linear phenolic resin, optionally 5 to 15 parts of phenolic resin;

[0016] 0.01 to 1 part of antioxidant, optionally 0.1 to 0.8 part of antioxidant;

[0017] 0.01 to 1 part of lubricant, optionally 0.1 to 0.5 part of lubricant.

[0018] Using the raw materials in the above parts by mass can further increase the probability of hydrogen bond formation between the hydroxyl groups in the linear phenolic resin and the amide bonds in the nylon, reduce the proportion of amide bonds combined with water, lower the water absorption rate of the material, and at the same time increase the content of benzene rings in the linear phenolic resin, improve the heat resistance and stability of the material, reduce the cost of the material. At the same time, appropriate glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0019] In any embodiment, the nylon includes at least one of nylon 6, nylon 612, nylon 11, and nylon 12. The larger the molecular chain monomer of the nylon and the lower the amide bond content, the lower the water absorption rate. Using at least one of the above nylons can further reduce the water absorption rate. It should be noted that the above nylon 6 refers to caprolactam, nylon 612 refers to the polycondensation of hexamethylenediamine and dodecanedioic acid, nylon 11 refers to 11-carbon lactam, and nylon 12 refers to 12-carbon lactam.

[0020] In any embodiment, the length of the glass fiber is 2-20 mm. The glass fiber has a large aspect ratio. As a filling material added to the material, it can act as a skeleton structure, improve the rigidity and impact resistance of the material. Within this range, it can improve the impact resistance of the waterproof material while facilitating molding and extrusion. Optionally, the length of the glass fiber is 3-4.5 mm, which can further improve the impact resistance of the waterproof material while facilitating molding and extrusion.

[0021] In any embodiment, the antioxidant includes at least one of antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxidant 626, antioxidant 168, antioxidant DNP, antioxidant DLTP, antioxidant TNP, antioxidant TPP, antioxidant MB, and antioxidant 300. Using at least one of the above antioxidants can improve the anti-aging performance of the material and extend the mechanical properties and service life of the product under the action of aging such as light and heat. It should be noted that the above antioxidant 1010 refers to pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], antioxidant 1098 refers to N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, antioxidant 1076 refers to n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, antioxidant 626 refers to bis(2,4-di-tert-butylphenol)pentaerythritol diphosphite, antioxidant 168 refers to tris[2,4-di-tert-butylphenyl]phosphite, antioxidant DNP refers to N,N'-di(β-naphthyl)-p-phenylenediamine, antioxidant DLTP refers to dilauryl thiodipropionate, antioxidant TNP refers to tris(nonylphenyl)phosphite, antioxidant TPP refers to triphenyl phosphite, antioxidant MB refers to 2-mercaptobenzimidazole, and antioxidant 300 refers to 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0022] In any embodiment, the lubricant includes at least one of vinyl bisstearamide, pentaerythritol stearate, calcium stearate, sodium stearate, silicone, and erucamide. By using at least one of the above lubricants, the lubricant can play a role in lubrication and demolding during injection molding.

[0023] In any embodiment, the waterproof material further includes a modified maleic anhydride compound. By adding the modified maleic anhydride compound, maleic anhydride can react with the amino group in nylon to increase the chain length, graft the modified maleic anhydride compound onto nylon, and improve the toughness and impact resistance of the waterproof material. It should be noted that the modified maleic anhydride compound refers to a maleic anhydride graft.

[0024] In any embodiment, the modified maleic anhydride compound includes at least one of maleic anhydride grafted ABS (ABS-g-MAH), maleic anhydride grafted PE (PE-g-MAH), maleic anhydride grafted PP (PP-g-MAH), maleic anhydride grafted PS (SMA), maleic anhydride grafted POE (POE-G-MAH), and maleic anhydride grafted EVA (EVA-G-MAH). By using at least one of the above modified maleic anhydride compounds, maleic anhydride can react with the terminal amino group of polyamide, reduce the water absorption rate of the amide bond in the polyamide material, and at the same time play a toughening role. It should be noted that maleic anhydride grafted ABS (ABS-g-MAH) refers to maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer, maleic anhydride grafted refers to maleic anhydride grafted polyethylene, maleic anhydride grafted PP (PP-g-MAH) refers to maleic anhydride grafted polypropylene, maleic anhydride grafted PS (SMA) refers to maleic anhydride grafted polystyrene, maleic anhydride grafted POE (POE-G-MAH) refers to maleic anhydride grafted polyolefin elastomer, and maleic anhydride grafted EVA (EVA-G-MAH) refers to maleic anhydride grafted ethylene-vinyl acetate copolymer.

[0025] In any embodiment, the mass ratio of the modified maleic anhydride compound to the nylon is 1:(2 - 20). The modified maleic anhydride compound and nylon at this mass ratio can provide sufficient maleic anhydride to react with the amino group in nylon, increase the chain length, graft the modified maleic anhydride compound onto nylon, and further improve the toughness and impact resistance of the waterproof material; optionally, the mass ratio of the modified maleic anhydride compound to the nylon is 1:(5 - 15).

[0026] In a second aspect, an embodiment of the present application provides a method for preparing a waterproof material, including the following steps:

[0027] Mix raw materials including at least nylon, glass fiber, linear phenolic resin, antioxidant and lubricant to obtain a mixture;

[0028] Heat, extrude, cool and granulate the mixture to obtain a waterproof material.

[0029] By adding linear phenolic resin to the material composed of nylon and glass fiber, hydrogen bonds are formed between the hydroxyl groups in the linear phenolic resin and the amide bonds in nylon, reducing the proportion of amide bonds combined with water, thereby reducing the water absorption rate of the material. At the same time, the benzene ring structure in the linear phenolic resin is used to improve the heat resistance and stability of the material, reducing the cost of the material. At the same time, the addition of glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0030] In any embodiment, in the step of "heating, extruding, cooling and granulating the mixture to obtain a waterproof material",

[0031] The heating temperature is 210 - 270 °C; at this temperature, the mixture can be melted for easy molding, and at the same time, the rate of hydrogen bond formation between linear phenolic resin and nylon can be increased. Optionally, the heating temperature is 230 - 250 °C, which can further melt the mixture for easy molding and increase the rate of hydrogen bond formation between linear phenolic resin and nylon; and / or,

[0032] The extrusion method includes twin-screw extrusion, and the rotation speed of the twin-screw extrusion is 300 - 550 rpm. At this rotation speed, the component materials can be mixed evenly; optionally, the rotation speed of the twin-screw extrusion is 300 - 550 rpm.

[0033] In any embodiment, the step of "mixing raw materials including at least nylon, glass fiber, linear phenolic resin, antioxidant and lubricant to obtain a mixture" includes:

[0034] Mix nylon, glass fiber, linear phenolic resin, acid anhydride compound, antioxidant and lubricant to obtain a mixture.

[0035] By adding a modified maleic anhydride compound, maleic anhydride can react with the amino group in nylon to amplify the chain length, graft the modified maleic anhydride compound onto nylon, and improve the toughness and impact resistance of the waterproof material.

[0036] In a third aspect, an embodiment of the present application provides a battery, including an end plate, and the material of the end plate includes the waterproof material of the first aspect of the present application or the waterproof material prepared by the preparation method of the waterproof material of the second aspect of the present application.

[0037] In a fourth aspect, an embodiment of the present application provides an electrical device, including the battery of the third aspect of the present application. Description of the Drawings

[0038] Figure 1 It is a schematic diagram of a secondary battery according to an embodiment of the present application.

[0039] Figure 2 is Figure 1 An exploded view of the secondary battery according to an embodiment of the present application shown in the figure.

[0040] Figure 3 It is a schematic diagram of a battery module according to an embodiment of the present application.

[0041] Figure 4 It is a schematic diagram of a battery pack according to an embodiment of the present application.

[0042] Figure 5 is Figure 4 An exploded view of the battery pack according to an embodiment of the present application shown in the figure.

[0043] Figure 6 It is a schematic diagram of an electrical device using the secondary battery according to an embodiment of the present application as a power source.

[0044] Explanation of reference numerals:

[0045] 1 Battery pack; 2 Upper box body; 3 Lower box body; 4 Battery module; 5 Secondary battery; 51 Housing; 52 Electrode assembly; 53 Top cover assembly. Specific embodiments

[0046] Hereinafter, embodiments of the waterproof material and its preparation method, battery and electrical device of the present application are specifically disclosed. However, there may be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters and repeated descriptions of actually identical structures 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 drawings and the following description are provided for those skilled in the art to fully understand the present application and are not intended to limit the subject matter recited in the claims.

[0047] The "ranges" disclosed in this application are defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The ranges defined in this way can include the end values or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, 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 contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise specified, the numerical range "a-b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been fully listed herein, and "0-5" is only an abbreviated representation of these numerical combinations. Additionally, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0048] If there is no special instruction, all implementation manners and optional implementation manners of this application can be combined with each other to form a new technical solution.

[0049] If there is no special instruction, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0050] If there is no special instruction, all steps of this application can be carried out sequentially or randomly, and preferably sequentially. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out sequentially, or can also include steps (b) and (a) carried out sequentially. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b), and (c), or can also include steps (a), (c), and (b), or can also include steps (c), (a), and (b), etc.

[0051] The housing of the battery usually works in complex working conditions such as high temperature, low temperature, high humidity environments, or bumpy road conditions, providing support and protection for the battery cells.

[0052] Therefore, in order to reduce the influence of the environment on the battery cells, higher requirements are put forward for the battery housing. Especially in a high humidity environment, reducing the influence of moisture on the battery cells becomes an important factor affecting the battery life. Therefore, the waterproof performance of the battery housing material is particularly important.

[0053] However, it is difficult for current battery housing materials to meet the requirements in terms of waterproof performance, impact resistance, and cost.

[0054] Therefore, there have been numerous studies on the waterproof performance and impact resistance of nylon materials. For example, a low water absorption nylon material includes the following raw materials in parts by mass: PA612, antioxidant, modifier, copolymerized formaldehyde, filler, and auxiliary agent. Its preparation method includes the following steps: S1: Add PA612 and copolymerized formaldehyde to a blender and mix to obtain mixture A; S2: Mix other raw materials in the blender to obtain mixture B, and then add mixture A to mixture B to obtain mixture C; S3: Pour mixture C into the feed hopper and heat up for preheating; S4: Extrude the preheated mixture C through a twin-screw from the head, and then cool and pelletize. The low water absorption nylon material of this application can be used to prepare battery seals, which can reduce the water absorption rate of the battery seals while improving the mechanical properties of the battery seals. However, the above nylon material is costly and has a risk of releasing formaldehyde as the temperature rises.

[0055] Surprisingly, by adding linear phenolic resin and glass fiber to the nylon material, the hydroxyl group in the linear phenolic resin forms hydrogen bonds with the amide bond in the nylon, reducing the proportion of the amide bond combined with water, thereby reducing the water absorption rate of the material. At the same time, the benzene ring structure in the linear phenolic resin is used to improve the heat resistance and stability of the material, reducing the cost of the material. At the same time, the addition of glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0056] Based on this, this application provides a waterproof material, its preparation method, a battery, and an electrical device.

[0057] In the first aspect, an embodiment of this application proposes a waterproof material, including the following raw materials: nylon, glass fiber, linear phenolic resin, antioxidant, and lubricant.

[0058] Thus, in the technical solution of the embodiment of this application, by adding linear phenolic resin to the material composed of nylon and glass fiber, the hydroxyl group in the linear phenolic resin forms hydrogen bonds with the amide bond in the nylon, reducing the proportion of the amide bond combined with water, thereby reducing the water absorption rate of the material. At the same time, the benzene ring structure in the linear phenolic resin is used to improve the heat resistance and stability of the material, reducing the cost of the material. At the same time, the addition of glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0059] In any embodiment, the hydroxyl equivalent of the linear phenolic resin is 80 to 180 g / eq; the linear phenolic resin within this hydroxyl equivalent range can enable sufficient phenolic hydroxyl groups to form hydrogen bonds with the nylon terminal amino groups, reducing the water absorption rate caused by the combined water between carboxyl groups and amino groups. The hydroxyl equivalent of the linear phenolic resin can be 80 g / eq, 90 g / eq, 100 g / eq, 110 g / eq, 120 g / eq, 130 g / eq, 140 g / eq, 150 g / eq, 160 g / eq, 170 g / eq or 180 g / eq. Optionally, the hydroxyl equivalent of the linear phenolic resin is 103 to 107 g / eq. It should be noted that within the range of 80 to 180 g / eq of the hydroxyl equivalent of the linear phenolic resin, the melt viscosity of the linear phenolic resin at 150 °C can be 25 to 45 Pa·s. Among them, the melt viscosity refers to the viscosity in the state of heating and melting or dissolving, which is measured by a viscometer or viscosimeter and directly affects the fluidity of the resin.

[0060] In any embodiment, the linear phenolic resin includes at least one of linear phenol formaldehyde resin, linear bisphenol A formaldehyde resin and linear o-cresol formaldehyde resin. By using at least one of the above linear phenolic resins, the terminal hydroxyl groups of the linear phenolic resin can hinder the combination of amide bonds and water, reducing the water absorption rate of the polyamide.

[0061] In any embodiment, the mass ratio of the linear phenolic resin to the nylon is 1:(1.5 to 40). At this mass ratio, there are sufficient hydroxyl groups in the linear phenolic resin to form hydrogen bonds with the amide bonds in the nylon, further reducing the proportion of amide bonds combined with water, further reducing the water absorption rate of the material, further improving the heat resistance and stability of the material, and further improving the impact resistance of the material; the mass ratio of the linear phenolic resin to the nylon can be 1:1.5, 1:3, 1:5, 1:10, 1:15, 1:20, 1:25, 1:30, 1:35 or 1:40. Optionally, the mass ratio of the linear phenolic resin to the nylon is 1:(3 to 15).

[0062] In any embodiment, by mass parts, the waterproof material comprises the following raw materials: 30-80 parts of nylon, and the nylon can be 30 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or 80 parts. Optionally, 45-65 parts of nylon. 10-50 parts of glass fiber, and the glass fiber can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts. Optionally, 25-35 parts of glass fiber. 2-20 parts of linear phenolic resin, and the linear phenolic resin can be 2 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts or 20 parts. Optionally, 5-15 parts of phenolic resin. 0.01-1 part of antioxidant, and the antioxidant can be 0.01 part, 0.1 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part or 1.0 part. Optionally, 0.1-0.8 part of antioxidant. 0.01-1 part of lubricant, and the lubricant can be 0.01 part, 0.1 part, 0.2 part, 0.4 part, 0.6 part, 0.8 part or 1.0 part. Optionally, 0.1-0.5 part of lubricant.

[0063] Using the raw materials in the above mass parts can further increase the probability of hydrogen bond formation between the hydroxyl groups in the linear phenolic resin and the amide bonds in the nylon, reduce the proportion of amide bonds combined with water, reduce the water absorption rate of the material, and at the same time increase the content of benzene rings in the linear phenolic resin, improve the heat resistance and stability of the material, reduce the cost of the material. At the same time, appropriate glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0064] In any embodiment, the nylon includes at least one of nylon 6, nylon 612, nylon 11 and nylon 12. The larger the molecular chain monomer of the nylon and the lower the amide bond content, the lower the water absorption rate. Using at least one of the above nylons can further reduce the water absorption rate. It should be noted that the above nylon 6 refers to caprolactam, nylon 612 refers to the polycondensation of hexamethylenediamine and dodecanedioic acid, nylon 11 refers to 11-carbon lactam, and nylon 12 refers to 12-carbon lactam.

[0065] In any embodiment, the length of the glass fiber is 2-20 mm. The glass fiber has a large aspect ratio. As a filling material added to the material, it can act as a skeleton structure, improve the rigidity and impact resistance of the material. Within this range, it can improve the impact resistance of the waterproof material while facilitating molding and extrusion. The length of the glass fiber can be 2 mm, 3 mm, 4 mm, 4.5 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm or 20 mm. Optionally, the length of the glass fiber is 3-4.5 mm, which can further improve the impact resistance of the waterproof material while facilitating molding and extrusion.

[0066] In any embodiment, the antioxidant includes at least one of antioxidant 1010, antioxidant 1098, antioxidant 1076, antioxidant 626, antioxidant 168, antioxidant DNP, antioxidant DLTP, antioxidant TNP, antioxidant TPP, antioxidant MB, and antioxidant 300. By using at least one of the above antioxidants, the anti-aging performance of the material can be improved, and the mechanical properties and service life of the product can be extended under the action of aging such as light and heat. It should be noted that the above antioxidant 1010 refers to pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], antioxidant 1098 refers to N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, antioxidant 1076 refers to n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, antioxidant 626 refers to bis(2,4-di-tert-butylphenol)pentaerythritol diphosphite, antioxidant 168 refers to tris[2,4-di-tert-butylphenyl]phosphite, antioxidant DNP refers to N,N'-di(β-naphthyl)-p-phenylenediamine, antioxidant DLTP refers to dilauryl thiodipropionate, antioxidant TNP refers to tris(nonylphenyl)phosphite, antioxidant TPP refers to triphenyl phosphite, antioxidant MB refers to 2-mercaptobenzimidazole, and antioxidant 300 refers to 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0067] In any embodiment, the lubricant includes at least one of ethylene bisstearamide, pentaerythritol stearate, calcium stearate, sodium stearate, silicone, and erucamide. By using at least one of the above lubricants, the lubricant can play a role in lubrication and demolding during injection molding.

[0068] In any embodiment, the waterproof material further includes a modified maleic anhydride compound. By adding the modified maleic anhydride compound, maleic anhydride can react with the amino group in nylon to increase the chain length, and the modified maleic anhydride compound can be grafted onto nylon to improve the toughness and impact resistance of the waterproof material. It should be noted that the modified maleic anhydride compound refers to a maleic anhydride graft.

[0069] In any embodiment, the modified maleic anhydride compound includes at least one of maleic anhydride grafted ABS (ABS-g-MAH), maleic anhydride grafted PE (PE-g-MAH), maleic anhydride grafted PP (PP-g-MAH), maleic anhydride grafted PS (SMA), maleic anhydride grafted POE (POE-G-MAH), and maleic anhydride grafted EVA (EVA-G-MAH). By using at least one of the above-mentioned modified maleic anhydride compounds, maleic anhydride can react with the terminal amino groups of polyamide, reduce the water absorption rate of the amide bonds in the polyamide material, and play a toughening role at the same time. It should be noted that maleic anhydride grafted ABS (ABS-g-MAH) refers to maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer, maleic anhydride grafted refers to maleic anhydride grafted polyethylene, maleic anhydride grafted PP (PP-g-MAH) refers to maleic anhydride grafted polypropylene, maleic anhydride grafted PS (SMA) refers to maleic anhydride grafted polystyrene, maleic anhydride grafted POE (POE-G-MAH) refers to maleic anhydride grafted polyolefin elastomer, and maleic anhydride grafted EVA (EVA-G-MAH) refers to maleic anhydride grafted ethylene-vinyl acetate copolymer.

[0070] It should be noted that in some embodiments of the present application, the maleic anhydride grafted POE (POE-G-MAH) added has a melt index of 5-8 g / 10 min. The melt index of maleic anhydride grafted POE refers to the fluidity of the maleic anhydride grafted POE material, which characterizes the processability of the material, and the processability is better within this range.

[0071] In any embodiment, the mass ratio of the modified maleic anhydride compound to the nylon is 1:(2-20). The modified maleic anhydride compound and nylon with this mass ratio can provide sufficient maleic anhydride to react with the amino groups in the nylon, amplify the chain length, graft the modified maleic anhydride compound onto the nylon, and further improve the toughness and impact resistance of the waterproof material; the mass ratio of the modified maleic anhydride compound to the nylon can be 1:2, 1:3, 1:4, 1:4.5, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19 or 1:20. Optionally, the mass ratio of the modified maleic anhydride compound to the nylon is 1:(5-15).

[0072] In the second aspect, an embodiment of the present application provides a method for preparing a waterproof material, including the following steps:

[0073] Mix raw materials including at least nylon, glass fiber, linear phenolic resin, antioxidant, and lubricant to obtain a mixture;

[0074] Heat, extrude, cool, and granulate the mixture to obtain a waterproof material.

[0075] By adding linear phenolic resin to the material composed of nylon and glass fiber, the hydroxyl group in the linear phenolic resin forms hydrogen bonds with the amide bond in nylon, reducing the proportion of amide bond combined with water, thereby reducing the water absorption rate of the material. At the same time, the benzene ring structure in the linear phenolic resin is used to improve the heat resistance and stability of the material, reducing the cost of the material. At the same time, the addition of glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0076] In any embodiment, in the step of "heating, extruding, cooling, and granulating the mixture to obtain a waterproof material",

[0077] The heating temperature is 210 - 270 °C; at this temperature, the mixture can be melted for easy molding, and at the same time, the rate of hydrogen bond formation between the linear phenolic resin and nylon can be increased. The heating temperature can be 210 °C, 220 °C, 230 °C, 240 °C, 250 °C, 260 °C or 270 °C. Optionally, the heating temperature is 230 - 250 °C, which can further melt the mixture for easy molding, and at the same time, increase the rate of hydrogen bond formation between the linear phenolic resin and nylon;

[0078] The extrusion method includes twin-screw extrusion, and the rotation speed of the twin-screw extrusion is 300 - 550 rpm. At this rotation speed, the component materials can be mixed evenly; optionally, the rotation speed of the twin-screw extrusion is 300 - 550 rpm.

[0079] It should be noted that the above heating temperature, extrusion method, and extrusion rotation speed can be set simultaneously or separately, and the molding effect is better when set simultaneously.

[0080] In any embodiment, the step of "mixing raw materials including at least nylon, glass fiber, linear phenolic resin, antioxidant, and lubricant to obtain a mixture" includes:

[0081] Mix nylon, glass fiber, linear phenolic resin, acid anhydride compound, antioxidant, and lubricant to obtain a mixture.

[0082] By adding a modified maleic anhydride compound, maleic anhydride can react with the amino group in nylon to amplify the chain length, graft the modified maleic anhydride compound onto nylon, and improve the toughness and impact resistance of the waterproof material.

[0083] In the third aspect, an embodiment of the present application proposes a battery, including an end plate, wherein the material of the end plate includes the waterproof material of the first aspect of the present application, or the waterproof material prepared by the preparation method of the waterproof material of the second aspect of the present application.

[0084] In any embodiment, the battery includes a primary battery or a secondary battery.

[0085] In one embodiment of the present application, a secondary battery is provided. Generally, a secondary battery includes a positive electrode sheet, a negative electrode sheet, an electrolyte, and a separator. During the charge and discharge process of the battery, active ions are inserted and extracted back and forth between the positive electrode sheet and the negative electrode sheet. The electrolyte functions to conduct ions between the positive electrode sheet and the negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet, mainly functioning to prevent short circuit between the positive and negative electrodes, and at the same time allowing ions to pass through.

[0086] The positive electrode sheet includes a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector.

[0087] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode film layer is provided on either or both of the two opposite surfaces of the positive electrode current collector.

[0088] In some embodiments, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum foil can be used. The composite current collector can include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0089] In some embodiments, the positive electrode active material can be a positive electrode active material for lithium ion batteries well-known in the art. As an example, the positive electrode active material can include at least one of the following materials: lithium phosphate with an olivine structure, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium transition metal oxides can include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (which can also be simply referred to as NCM333 )), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 )), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 )), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 )), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 )), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc. Examples of olivine-structured lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and at least one of a composite material of lithium manganese iron phosphate and carbon.

[0090] In some embodiments, the positive electrode film layer further includes a binder. As an example, the binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, and fluorinated acrylate resin.

[0091] In some embodiments, the positive electrode film layer further includes a conductive agent. As an example, the conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0092] In some embodiments, the positive electrode sheet can be prepared by the following method: dispersing the components for preparing the positive electrode sheet, such as the positive electrode active material, the conductive agent, the binder, and any other components, in a solvent (such as N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry on the positive electrode sheet structure, and after processes such as drying and cold pressing, the positive electrode sheet can be obtained.

[0093] The negative electrode sheet includes a positive current collector and a negative electrode film layer provided on at least one surface of the positive current collector, and the negative electrode film layer includes a negative electrode active material.

[0094] As an example, the negative electrode sheet structure includes a negative current collector having two surfaces opposite to each other in its own thickness direction, and the negative electrode film layer is provided on either or both of the two opposite surfaces of the negative current collector structure.

[0095] In some embodiments, the negative current collector can be a metal foil or a composite current collector. For example, as the metal foil, copper foil can be used. The composite current collector can include a polymer material base layer and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0096] In some embodiments, the negative electrode active material can be a negative electrode active material known in the art for batteries. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0097] In some embodiments, the negative electrode film layer further includes a binder. The binder can be selected from at least one of styrene-butadiene rubber (SBR), polyacrylic acid (PAA), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA), polymethacrylic acid (PMAA), and carboxymethyl chitosan (CMCS).

[0098] In some embodiments, the negative electrode film layer further includes a conductive agent. The conductive agent can be selected from at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0099] In some embodiments, the negative electrode film layer further includes other additives, such as thickeners (such as sodium carboxymethyl cellulose (CMC-Na)), etc.

[0100] In some embodiments, the negative electrode sheet can be prepared in the following manner: dispersing the above-mentioned components for preparing the negative electrode sheet, such as the negative electrode active material, the conductive agent, the binder, and any other components, in a solvent (such as deionized water) to form a negative electrode slurry; coating the negative electrode slurry on the negative electrode sheet structure, and after processes such as drying and cold pressing, the negative electrode sheet can be obtained.

[0101] The electrolyte plays a role in conducting ions between the positive electrode sheet and the negative electrode sheet. There is no specific limitation on the type of the electrolyte in this application, and it can be selected according to requirements. For example, the electrolyte can be liquid, gel-like, or all-solid-state.

[0102] In some embodiments, the electrolyte uses an electrolytic solution. The electrolytic solution includes an electrolyte salt and a solvent.

[0103] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0104] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone.

[0105] In some embodiments, the electrolytic solution may further optionally include additives. For example, the additives can include negative electrode film-forming additives, positive electrode film-forming additives, and can also include additives that can improve certain properties of the battery, such as additives for improving the overcharge performance of the battery, additives for improving the high-temperature or low-temperature performance of the battery, etc.

[0106] In some embodiments, the secondary battery further includes a separator. There is no particular limitation on the type of the separator in this application, and any well-known porous structure separator with good chemical stability and mechanical stability can be selected.

[0107] In some embodiments, the material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation.

[0108] In some embodiments, the positive electrode sheet, the negative electrode sheet, and the separator may be made into an electrode assembly through a winding process or a stacking process.

[0109] In some embodiments, the secondary battery may include an outer package. The outer package may be used to encapsulate the above-mentioned electrode assembly and electrolyte.

[0110] In some embodiments, the outer package of the secondary battery may be a hard shell, such as a hard plastic shell, an aluminum shell, a steel shell, etc. The outer package of the secondary battery may also be a soft package, such as a pouch soft package. The material of the soft package may be plastic. As plastics, polypropylene, polybutylene terephthalate, and polybutylene succinate, etc. may be listed.

[0111] This application has no particular limitation on the shape of the secondary battery, and it may be cylindrical, square, or any other arbitrary shape. For example, Figure 1 is a secondary battery 5 with a square structure as an example.

[0112] In some embodiments, referring to Figure 2 , the outer package may include a housing 51 and a cover plate 53. Among them, the housing 51 may include a bottom plate and side plates connected to the bottom plate, and the bottom plate and the side plates enclose a receiving cavity. The housing 51 has an opening communicating with the receiving cavity, and the cover plate 53 can be covered on the opening to close the receiving cavity. The positive electrode sheet, the negative electrode sheet, and the separator may form an electrode assembly 52 through a winding process or a stacking process. The electrode assembly 52 is encapsulated in the receiving cavity. The electrolyte is infiltrated in the electrode assembly 52. The number of electrode assemblies 52 included in the secondary battery 5 may be one or more, and those skilled in the art can select according to specific actual needs.

[0113] In some embodiments, the secondary batteries may be assembled into a battery module. The number of secondary batteries included in the battery module may be one or more, and the specific number can be selected by those skilled in the art according to the application and capacity of the battery module.

[0114] Figure 3 is a battery module 4 as an example. Referring to Figure 3 , in the battery module 4, a plurality of secondary batteries 5 may be arranged in sequence along the length direction of the battery module 4. Of course, they may also be arranged in any other arbitrary manner. Further, the plurality of secondary batteries 5 may be fixed by fasteners.

[0115] Optionally, the battery module 4 may further include a housing having a receiving space, and a plurality of secondary batteries 5 are received in the receiving space. The housing may include end plates, and the end plates include the waterproof material of the first aspect of this application or the waterproof material prepared by the preparation method of the second aspect of this application. The end plates may be the bottom plate or the top plate when the battery pack is placed, improving the waterproof performance of the housing.

[0116] In some embodiments, the above battery modules can also be assembled into a battery pack. The number of battery modules included in the battery pack can be one or more. Those skilled in the art can select the specific number according to the application and capacity of the battery pack.

[0117] Figure 4 and Figure 5 is Battery Pack 1 as an example. Refer to Figure 4 and Figure 5 In Battery Pack 1, a battery box and a plurality of battery modules 4 disposed in the battery box can be included. The battery box includes an upper box body 2 and a lower box body 3. The upper box body 2 can cover the lower box body 3 and form a closed space for accommodating the battery modules 4. The plurality of battery modules 4 can be arranged in the battery box in any manner.

[0118] In a fourth aspect, an embodiment of the present application provides an electrical device including the battery of the fourth aspect of the present application.

[0119] In addition, the present application also provides an electrical device including at least one of the secondary battery, battery module, or battery pack provided by the present application. The secondary battery, battery module, or battery pack can be used as the power source of the electrical device or as the energy storage unit of the electrical device. The electrical device can 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, satellites, energy storage systems, etc., but is not limited thereto.

[0120] As the electrical device, the secondary battery, battery module, or battery pack can be selected according to its usage requirements.

[0121] Figure 6 is an example of an electrical device. The electrical device is a pure electric vehicle, hybrid electric vehicle, or plug-in hybrid electric vehicle, etc. To meet the high power and high energy density requirements of the electrical device for the secondary battery, a battery pack or battery module can be used.

[0122] Another example of the device can be a mobile phone, tablet computer, laptop, etc. This device usually requires being thin and light, and a secondary battery can be used as the power source.

[0123] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0124] The waterproof material parameters of Embodiments 1 to 26 and Comparative Examples 1 to 3 of the present application are according to the parameters in Table 1.

[0125]

[0126]

[0127] The waterproof materials of Examples 1 to 26 and Comparative Examples 1 to 3 were tested as follows:

[0128] Performance test

[0129] Water absorption test method: Use a sample plate or disc with a thickness of 2 - 3 mm and a length of about 100 mm, measure its initial mass as m1, and measure its mass as m2 after boiling in water at 100 °C for 24 h. Water absorption = (m2 - m1) / m1 * 100%.

[0130] Izod impact strength test method: The Izod impact strength test was carried out using ISO 179 simply supported beam notched impact.

[0131] As can be seen from Table 1, by adding linear phenolic resin to the material composed of nylon and glass fiber, hydrogen bonds are formed between the hydroxyl groups in the linear phenolic resin and the amide bonds in the nylon, reducing the proportion of amide bonds combined with water, thereby reducing the water absorption of the material. At the same time, the benzene ring structure in the linear phenolic resin is used to improve the heat resistance and stability of the material, reducing the cost of the material. At the same time, the addition of glass fiber can reduce the cost of the material while ensuring the impact resistance of the material.

[0132] As can be seen from Examples 1 to 26, different types of nylon, different lengths of glass fiber, different linear phenolic resins and hydroxyl equivalents, different antioxidants, and different lubricants can all reduce the proportion of amide bonds combined with water, thereby reducing the water absorption of the material.

[0133] Different parts of nylon, different parts of linear phenolic resin, different parts of glass fiber, and different parts of modified maleic anhydride can all reduce the proportion of amide bonds combined with water, thereby reducing the water absorption of the material.

[0134] By adding a modified maleic anhydride compound, maleic anhydride can react with the amino group in nylon to increase the chain length, graft the modified maleic anhydride compound onto nylon, and improve the toughness and impact resistance of the waterproof material. The mass ratio of the modified maleic anhydride compound to nylon is 1:(2 - 20). Under this mass ratio, the modified maleic anhydride compound and nylon can provide sufficient maleic anhydride to react with the amino group in nylon, increase the chain length, graft the modified maleic anhydride compound onto nylon, and further improve the toughness and impact resistance of the waterproof material.

[0135] The mass ratio of the linear phenolic resin to the nylon is 1:(1.5 - 40). At this mass ratio, there are sufficient hydroxyl groups in the linear phenolic resin to form hydrogen bonds with the amide bonds in the nylon, further reducing the proportion of amide bonds combined with water, further reducing the water absorption rate of the material, further improving the heat resistance and stability of the material, and further improving the impact resistance of the material.

[0136] In Comparative Example 1, since it does not contain linear phenolic resin, the water absorption rate of the waterproof material is relatively high.

[0137] In Comparative Example 2, since it does not contain glass fiber, the impact strength of the waterproof material is relatively low.

[0138] In Comparative Example 3, since it does not contain linear phenolic resin and glass fiber, the water absorption rate of the waterproof material is relatively high, and at the same time, the impact strength is relatively low.

[0139] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the patent protection scope of the present application.

Claims

1. A waterproof material, characterized in that: It includes the following raw materials: nylon, glass fiber, linear phenolic resin, antioxidant and lubricant.

2. The waterproof material according to claim 1, characterized in that: The hydroxyl equivalent of the linear phenolic resin is 80 to 180 g / eq; optionally, the hydroxyl equivalent of the linear phenolic resin is 103 to 107 g / eq.

3. The waterproof material according to claim 1 or 2, characterized in that: The linear phenolic resin includes at least one of a linear phenol formaldehyde resin, a linear bisphenol A formaldehyde resin and a linear o-cresol formaldehyde resin.

4. The waterproof material according to claim 1 or 2, characterized in that: The mass ratio of the linear phenolic resin to the nylon is 1:(1.5-40); optionally, the mass ratio of the linear phenolic resin to the nylon is 1:(3-15).

5. The waterproof material according to any one of claims 1 to 4, characterized in that: The waterproof material includes the following raw materials in parts by mass: 30-80 parts of nylon, optionally, 45-65 parts of nylon; 10 to 50 parts of glass fiber, optionally, 25 to 35 parts of glass fiber; 2 to 20 parts of linear phenolic resin, optionally, 5 to 15 parts of phenolic resin; 0.01 to 1 part of antioxidant, optionally, 0.1 to 0.8 part of antioxidant; 0.01 to 1 part of lubricant, optionally, 0.1 to 0.5 part of lubricant.

6. The waterproof material according to any one of claims 1 to 5, characterized in that: The nylon includes at least one of nylon 6, nylon 612, nylon 11 and nylon 12.

7. The waterproof material according to any one of claims 1 to 6, characterized in that: The length of the glass fiber is 2 to 20 mm. Optionally, the length of the glass fiber is 3 to 4.5 mm.

8. The waterproof material according to any one of claims 1 to 7, characterized in that: The antioxidant includes at least one of antioxidant 1010 , antioxidant 1098 , antioxidant 1076 , antioxidant 626 , antioxidant 168 , antioxidant DNP, antioxidant DLTP, antioxidant TNP, antioxidant TPP, antioxidant MB and antioxidant 300 .

9. The waterproof material according to any one of claims 1 to 8, characterized in that: The lubricant includes at least one of vinyl bisstearamide, pentaerythritol stearate, calcium stearate, sodium stearate, silicone and erucamide.

10. The waterproof material according to any one of claims 1 to 9, characterized in that: The waterproof material also includes a modified maleic anhydride compound.

11. The waterproof material according to claim 10, characterized in that: The modified maleic anhydride compound includes at least one of maleic anhydride grafted ABS (ABS-g-MAH), maleic anhydride grafted PE (PE-g-MAH), maleic anhydride grafted PP (PP-g-MAH), maleic anhydride grafted PS (SMA), maleic anhydride grafted POE (POE-G-MAH) and maleic anhydride grafted EVA (EVA-G-MAH).

12. The waterproof material according to claim 10 or 11, characterized in that: The mass ratio of the modified maleic anhydride compound to the nylon is 1:(2-20); optionally, the mass ratio of the modified maleic anhydride compound to the nylon is 1:(5-15).

13. The method for preparing a waterproof material according to any one of claims 1 to 12, characterized in that: The following steps are involved: Mixing raw materials including at least nylon, glass fiber, linear phenolic resin, antioxidant and lubricant to obtain a mixture; The mixture is heated, extruded, cooled and granulated to obtain a waterproof material.

14. The method for preparing a waterproof material according to claim 13, characterized in that: In the step of "heating, extruding, cooling and granulating the mixture to obtain a waterproof material", The heating temperature is 210-270° C.; optionally, the heating temperature is 230-250° C.; and / or, The extrusion method includes twin-screw extrusion, and the rotation speed of the twin-screw extrusion is 300-550rpm; optionally, the rotation speed of the twin-screw extrusion is 300-550rpm.

15. The method for preparing a waterproof material according to claim 13 or 14, characterized in that: The step of "mixing raw materials including at least nylon, glass fiber, linear phenolic resin, antioxidant and lubricant to obtain a mixture" includes: Nylon, glass fiber, linear phenolic resin, acid anhydride compound, antioxidant and lubricant are mixed to obtain a mixture.

16. A battery, characterized in that: It comprises an end plate, wherein the material of the end plate comprises the waterproof material according to any one of claims 1 to 12 or the waterproof material prepared by the method for preparing the waterproof material according to any one of claims 13 to 15.

17. An electrical device, characterized in that: Comprising the battery of claim 16.

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