Harmonica-shaped tube and preparation method thereof, liquid cooling plate, battery and electric equipment

Abstract

The invention discloses a harmonica-shaped tube and a preparation method thereof, a liquid cooling plate, a battery and electric equipment. The harmonica-shaped tube is made of a polyphenylene sulfide composition, and the polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; the flexibilizer includes a copolymer of an olefin and a glycidyl ester. According to the application, the polyphenylene sulfide composition is used as the material of the harmonica-shaped tube, so that the occurrence of the conditions that the extruded material is easily broken, the extrusion process is not smooth and the like in the extrusion molding process of the harmonica-shaped tube is reduced; the harmonica-shaped tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation performance, creep resistance and the like, the risk that cracking occurs when the harmonica-shaped tube is extruded in the working condition using process is reduced, and the production capacity and the product quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a harmonica pipe and a preparation method thereof, a liquid cooling plate, a battery, and electrical equipment. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] As a new generation of green energy storage and conversion devices, batteries have been widely used in portable electronic devices and power vehicles. The heat dissipation capacity of new energy batteries is an important performance related to the normal operation and safe use of new energy batteries. Liquid cooling plates are usually set between battery cells to achieve rapid heat dissipation of the battery. At present, liquid cooling plates still need to be improved in terms of material selection, molding process, performance indicators, etc. Summary of the invention

[0004] The main technical problem solved by this application is that there is still room for improvement in material selection, molding, performance indicators, etc. of liquid cooling plates.

[0005] In a first aspect, an embodiment of the present application provides a harmonica tube, wherein the material of the harmonica tube includes a polyphenylene sulfide composition, the polyphenylene sulfide composition includes a polyphenylene sulfide resin and a toughening agent; the toughening agent includes a copolymer of an olefin and a glycidyl ester.

[0006] The embodiments of the present application use a toughening agent including a copolymer of olefin and glycidyl ester to modify a polyphenylene sulfide resin. The resulting polyphenylene sulfide composition is used as the material of a harmonica tube. The polyphenylene sulfide composition has the characteristics of simple processing technology and suitability for extrusion molding. There is no abnormality in the process of extrusion molding the harmonica tube. The product has good dimensional stability, high precision, and low surface roughness. The mechanical properties of the material such as strength, toughness, and elongation at break can meet the product working conditions, which is beneficial to reducing the occurrence of extruded material breakage and poor extrusion process that are prone to occur during the extrusion molding of the harmonica tube. The harmonica tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance, etc., which reduces the risk of cracking when squeezed during use, and improves production capacity and product quality.

[0007] In some embodiments, the polyphenylene sulfide resin has a number average molecular weight of at least 50,000.

[0008] The number average molecular weight of the polyphenylene sulfide resin in the embodiment of the present application is at least 50,000, and its viscosity is relatively high, which facilitates extrusion processing and molding. In addition, the polyphenylene sulfide resin with a large number average molecular weight has high rigidity, which is conducive to the harmonica tube formed therefrom having good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation performance, and creep resistance and other properties.

[0009] In some embodiments, the number average molecular weight of the polyphenylene sulfide resin is 50,000 to 10,000.

[0010] The number average molecular weight of the polyphenylene sulfide resin in the embodiment of the present application is 50,000 to 10,000, which is conducive to the harmonica tube formed having good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation performance, creep resistance and other properties.

[0011] In some embodiments, the polyphenylene sulfide composition includes 80 to 90 parts by weight of polyphenylene sulfide resin and 10 to 20 parts by weight of toughening agent.

[0012] In any embodiment, the raw material, in terms of weight, the polyphenylene sulfide resin may be 80 weight parts, 81 weight parts, 82 weight parts, 83 weight parts, 84 weight parts, 85 weight parts, 86 weight parts, 87 weight parts, 88 weight parts, 89 weight parts, 90 weight parts, or a range consisting of any two of the above values. For example, the raw material, in terms of weight, the polyphenylene sulfide resin may be 80 weight parts to 85 weight parts, 83 weight parts to 88 weight parts, 85 weight parts to 90 weight parts. Within the above range, a smaller weight of the polyphenylene sulfide resin is beneficial to increasing the toughness of the harmonica tube, reducing the occurrence of extrusion material breakage and poor extrusion process that are easy to occur during the extrusion molding process of the harmonica tube, and a larger weight of the polyphenylene sulfide resin is beneficial to increasing the rigidity of the harmonica tube and improving the dimensional stability of the harmonica tube. In any embodiment, the raw material can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, or a range consisting of any two of the above values. For example, the raw material can be 10 parts by weight to 15 parts by weight, 12 parts by weight to 18 parts by weight, or 15 parts by weight to 20 parts by weight. Within the above range, a larger part by weight of the toughening agent is beneficial to increase the toughness of the harmonica tube and reduce the occurrence of extrusion material breakage and poor extrusion process that are easy to occur during the extrusion molding process of the harmonica tube. A smaller part by weight of the toughening agent is beneficial to making the rigidity of the harmonica tube larger and improving the dimensional stability of the harmonica tube.

[0013] In some embodiments, the polyphenylene sulfide resin has a melt index of 55 g / 10 min to 125 g / 10 min at 316° C. / 10 kg.

[0014] In any embodiment, the melt index of the polyphenylene sulfide resin at 316°C / 10kg can be 55g / 10min, 60g / 10min, 65g / 10min, 70g / 10min, 75g / 10min, 80g / 10min, 85g / 10min, 90g / 10min, 95g / 10min, 100g / 10min, 105g / 10min, 110g / 10min, 115g / 10min, 120g / 10min, 125g / 10min, or a range consisting of any two of the above values. For example, the melt index of the polyphenylene sulfide resin at 316°C / 10kg can be 55g / 10min-100g / 10min, 80g / 10min-110g / 10min or 100g / 10min-125g / 10min. Within the above range, a larger melt index is beneficial to improving the fluidity of the polyphenylene sulfide resin and reducing the occurrence of extrudate breakage and poor extrusion process that are prone to occur during the extrusion molding process. A smaller melt index is beneficial to improving the rigidity of the polyphenylene sulfide resin and improving the mechanical strength and dimensional stability of the harmonica tube.

[0015] In some embodiments, the copolymer of olefin and glycidyl ester includes one or more of ethylene-glycidyl methacrylate (E-GMA), ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA), ethylene octene copolymer grafted with glycidyl methacrylate (POE-GMA), and styrene-butadiene-styrene block copolymer grafted with glycidyl methacrylate (SBS-GMA).

[0016] In the embodiments of the present application, the copolymer of olefin and glycidyl ester provided above has a toughening effect on the polyphenylene sulfide resin, which helps to reduce the occurrence of extruded material breakage and poor extrusion process during the extrusion molding process of the harmonica tube.

[0017] In some embodiments, the copolymer of olefin and glycidyl ester has a melt index of 4 g / 10 min to 10 g / 10 min at 190° C. / 2.16 kg.

[0018] In any embodiment, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K can be 4g / 10min, 4.5g / 10min, 5g / 10min, 5.5g / 10min, 6g / 10min, 6.5g / 10min, 7g / 10min, 7.5g / 10min, 8g / 10min, 8.5g / 10min, 9g / 10min, 9.5g / 10min, 10g / 10min, or a range consisting of any two of the above values. For example, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K can be 4g / 10min-6g / 10min, 6g / 10min-8g / 10min or 8g / 10min-10g / 10min. Within the above range, a larger melt index is beneficial to improving the fluidity of the copolymer of olefin and glycidyl ester and improving its affinity with polyphenylene sulfide resin, while a smaller melt index is beneficial to improving its performance of toughening polyphenylene sulfide resin and reducing the occurrence of extruded material breakage and poor extrusion process that are prone to occur during the extrusion molding of the harmonica tube.

[0019] In some embodiments, the polyphenylene sulfide composition further includes an antioxidant.

[0020] In the embodiments of the present application, the addition of antioxidants is helpful to delay the aging of the harmonica tube and increase the service life of the harmonica tube.

[0021] In some embodiments, the polyphenylene sulfide composition further comprises up to 0.5 parts by weight of an antioxidant.

[0022] In any embodiment, the polyphenylene sulfide composition may further include 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50 parts by weight of an antioxidant, or a range consisting of any two of the above values, for example, the polyphenylene sulfide composition may further include 0 to 0.20, 0.20 to 0.50, 0.30 to 0.45 parts by weight of an antioxidant. Within the above range, a smaller antioxidant weight portion is beneficial to improving the uniformity of the distribution of the antioxidant in the polyphenylene sulfide resin, reducing the raw material cost of the antioxidant, reducing the resource loss and environmental pollution caused by the antioxidant, and a larger antioxidant weight portion is beneficial to delaying the aging process of the harmonica pipe and increasing the service life of the harmonica pipe.

[0023] In some embodiments, the polyphenylene sulfide composition further comprises 0.2 to 0.5 parts by weight of an antioxidant.

[0024] The embodiments of the present application are within the above-mentioned weight range of the antioxidant, which is beneficial to improving the uniformity of the distribution of the antioxidant in the polyphenylene sulfide resin, delaying the aging process of the harmonica tube, and increasing the service life of the harmonica tube.

[0025] In some embodiments, the antioxidant includes one or both of N,N′-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and / or tris[2,4-di-tert-butylphenyl]phosphite.

[0026] Wherein, the antioxidant may include only N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, may include only tris[2.4-di-tert-butylphenyl]phosphite, or may include N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2.4-di-tert-butylphenyl]phosphite. In any embodiment, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2.4-di-tert-butylphenyl]phosphite may be mixed in any proportion. For example, the weight ratio of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine to tris[2,4-di-tert-butylphenyl]phosphite can be 1:0, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 0:1, 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, or a range consisting of any two of the above values. For example, the weight ratio of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2.4-di-tert-butylphenyl]phosphite can be (0.4-0.6):(0.4-0.6), (0.6-0.8):(0.6-0.8), (0.5-1):(0.1-0.4).

[0027] In a second aspect, an embodiment of the present application provides a method for preparing a harmonica tube, comprising:

[0028] Provide a preparation of a polyphenylene sulfide composition;

[0029] The polyphenylene sulfide composition is molded to obtain a harmonica tube;

[0030] The polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; the toughening agent comprises a copolymer of olefin and glycidyl ester.

[0031] In the embodiments of the present application, a harmonica tube is formed by processing polyphenylene sulfide resin and a copolymer of olefin and glycidyl ester as raw materials. The formed harmonica tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, and is not prone to cracking when squeezed during use, which is beneficial to improving production capacity and product quality.

[0032] In some embodiments, the step of molding the polyphenylene sulfide composition comprises:

[0033] The polyphenylene sulfide composition is added into a twin-screw extruder for extrusion molding.

[0034] The embodiment of the present application prepares the harmonica tube through an extrusion molding process, which has the advantages of continuous production and high efficiency.

[0035] In some embodiments, the screw speed of the twin-screw extruder is 300 rpm to 500 rpm.

[0036] In some embodiments, the zone temperature settings of the twin-screw extruder include: zone one temperature 100℃~120℃, zone two temperature 280℃~290℃, zone three temperature 290℃~310℃, zone four temperature 300℃~310℃, zone five temperature 290℃~300℃, zone six temperature 290℃~300℃, zone seven temperature 300℃~310℃, zone eight temperature 300℃~310℃, zone nine temperature 290℃~310℃, and die head temperature 300℃~320℃.

[0037] In the embodiments of the present application, by setting the above-mentioned extrusion molding process parameters, the extruded material of the polyphenylene sulfide composition is not prone to breakage or poor extrusion process during the process of forming a harmonica tube, so that the formed harmonica tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, and is not prone to cracking when squeezed during use, which is beneficial to improving production capacity and product quality.

[0038] In a third aspect, an embodiment of the present application provides a liquid cooling plate, the liquid cooling plate comprising any harmonica tube provided in the first aspect or a harmonica tube produced by the preparation method provided in the second aspect.

[0039] In a fourth aspect, an embodiment of the present application provides a battery, comprising a liquid cooling plate as provided in the third aspect.

[0040] In a fifth aspect, an embodiment of the present application provides an electrical device, comprising a battery as provided in the fourth aspect. When the battery of the electrical device uses the given liquid cooling plate, it has at least the same advantages as the battery, and can improve the heat dissipation performance of the electrical device.

[0041] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0044] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0045] Figure 3 A schematic diagram of the structure of a liquid cooling assembly provided in some embodiments of the present application;

[0046] Figure 4 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0047] Description of Figure Numbers:

[0048] 1000-vehicle, 100-battery, 200-controller, 300-motor, 400-battery module, 10-casing, 20-battery cell, 30-liquid cooling plate, 11-first part, 12-second part, 21-end cover, 22-shell, 23-electrode assembly, 21a-electrode terminal, 23a-ear, 401-end plate, 402-side plate. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and effect of the present application clearer and more specific, the following will describe the embodiments of the technical solution of the present application in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two (including two groups), and "multiple pieces" refers to more than two (including two pieces), unless otherwise clearly and specifically defined.

[0052] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0054] Amounts, ratios and other numerical values ​​are presented herein in a range format. It should be understood that such a range format is for convenience and brevity and should be flexibly interpreted to include not only the values ​​explicitly specified as range limits, but also all individual values ​​or sub-ranges encompassed within the range, as if each value and sub-range were explicitly specified.

[0055] The harmonica tube is used in the heat dissipation field of new energy batteries and is an important component related to the battery life, mileage and other functions of new energy batteries. The harmonica tube usually has multiple heat exchange medium flow channels so that the heat exchange medium receives heat and transfers heat through the flow channels. At present, some harmonica tubes are made of metal materials, such as aluminum. The molding process of this solution is relatively complicated and the raw material cost is high, and it is necessary to solve the insulation problem between it and other components. Some harmonica tubes are made of plastic materials to simplify the molding process and reduce the cost of raw materials, and are easy to have good insulation properties. However, general plastic materials are easily corroded by heat exchange media, accelerate the aging of harmonica tubes, and may cause cracking of harmonica tubes, affect the normal use of harmonica tubes, and reduce the service life of harmonica tubes. For example, in the harmonica tube made of polyamide, the amide bonds in polyamide are easy to form reactive functional groups such as hydrogen bonds, which are easy to react with heat exchange media such as water and ethylene glycol, causing the harmonica tube to be easily corroded by heat exchange media. In addition, the harmonica tube made of polyamide has relatively low mechanical strength, deformation resistance, heat resistance and creep resistance due to its segmented structure.

[0056] Since the structure of the harmonica tube is relatively complex, in some solutions, the harmonica tube made of plastic is formed by extrusion molding. The molding process is simple and efficient, and is suitable for the special-shaped structure of the harmonica tube. However, in the process of extrusion molding of general plastic materials, if the flexibility is large, the mechanical properties of the harmonica tube are likely to be poor, and it is difficult to meet the product requirements. If the rigidity is large, the tensile strength is high and the elongation at break is low, which may cause the extruded material to break and the extrusion process to be unsmooth, affecting the production capacity and product quality.

[0057] In a first aspect, an embodiment of the present application provides a harmonica pipe, wherein the material of the harmonica pipe includes a polyphenylene sulfide composition, wherein the polyphenylene sulfide composition includes a polyphenylene sulfide resin and a toughening agent, wherein the toughening agent includes a copolymer of an olefin and a glycidyl ester.

[0058] Among them, polyphenylene sulfide resin (PPS) refers to a thermoplastic resin whose main chain is composed of benzene rings alternately connected by sulfur atoms. Due to the partial overlap of the π electrons of the benzene rings, the energy is further reduced, forming a stable conjugated structure. The benzene ring structure gives the polyphenylene sulfide resin good mechanical properties, deformation resistance, heat resistance and creep resistance. The sulfide bond provides flexibility for the polyphenylene sulfide resin, making it have a certain fracture resistance, which is conducive to the extrusion molding of the harmonica tube. The number average molecular weight refers to the size of the molecules of the polyphenylene sulfide resin according to the number of molecules, that is, the ratio of the total mass of the molecules to the total number of molecules. There are two types of polyphenylene sulfide resins: low molecular weight and high molecular weight. The number average molecular weight of low molecular weight polyphenylene sulfide resin can be between 4000 and 5000, which is difficult to mold directly. The number average molecular weight of high molecular weight polyphenylene sulfide resin can be greater than 10,000, and can be directly used for processing plastic products without cross-linking. Toughener refers to a substance that can increase the flexibility of polyphenylene sulfide resin. The copolymer of olefin and glycidyl ester refers to a product formed by copolymerization of olefin and glycidyl ester. In the process of using the copolymer of olefin and glycidyl ester as a toughening agent to toughen the polyphenylene sulfide resin, the epoxy bond in the glycidyl ester undergoes a ring-opening reaction, and an alcohol and acid esterification reaction occurs with the end group of the polyphenylene sulfide resin, so that the molecular chain of the copolymer of olefin and glycidyl ester is connected to the molecular chain of the polyphenylene sulfide, thereby increasing the flexibility of the chain segment of the polyphenylene sulfide resin. Moreover, since the copolymer of olefin and glycidyl ester also has an olefin segment, while the glycidyl ester toughens the polyphenylene sulfide resin, the olefin segment of the copolymer of olefin and glycidyl ester is also connected to the molecular chain of the polyphenylene sulfide resin. Since the olefin has good flexibility, the olefin and glycidyl ester act synergistically on the polyphenylene sulfide resin, further improving the flexibility of the polyphenylene sulfide composition. The characteristic absorption peaks of the infrared spectrum of the harmonica tube material can be analyzed, and the characteristic absorption peak data of the infrared spectrum of the harmonica tube material can be compared with the infrared spectrum or standard spectrum of known compounds to analyze the molecular structure and groups of the harmonica tube material. For example, according to the infrared spectrum of the harmonica tube material, compared with the infrared spectrum or standard spectrum of known compounds, it is analyzed that the harmonica tube material includes benzene rings, benzene sulfide bonds, olefins, ester groups, hydroxyl groups, alkyl groups and other functional groups, and then according to the analyzed benzene rings and benzene sulfide bonds, the reverse qualitative analysis shows that the harmonica tube material includes polyphenylene sulfide, according to the analyzed olefins, the reverse qualitative analysis shows that the harmonica tube material includes olefins, and according to the analyzed olefins, ester groups, hydroxyl groups, and alkyl groups, the reverse qualitative analysis shows that the harmonica tube material includes copolymers of glycidyl esters.

[0059] The embodiments of the present application use a toughening agent including a copolymer of olefin and glycidyl ester to modify a polyphenylene sulfide resin. The resulting polyphenylene sulfide composition is used as the material of a harmonica tube. The polyphenylene sulfide composition has the characteristics of simple processing technology and suitability for extrusion molding. There is no abnormality in the process of extrusion molding the harmonica tube. The product has good dimensional stability, high precision, and low surface roughness. The mechanical properties of the material such as strength, toughness, and elongation at break can meet the product working conditions, which is beneficial to reducing the occurrence of extruded material breakage and poor extrusion process that are prone to occur during the extrusion molding of the harmonica tube. The harmonica tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance, etc., which reduces the risk of cracking when squeezed during use, and improves production capacity and product quality.

[0060] In some embodiments, the polyphenylene sulfide resin has a number average molecular weight of at least 50,000.

[0061] In any embodiment, the number average molecular weight of the polyphenylene sulfide resin can be 50000, 60000, 65000, 70000, 75000, 80000, 85000, 90000, 95000, 100000, or a range consisting of any two of the above values, for example, the number average molecular weight of the polyphenylene sulfide resin can be 50000-80000, 70000-90000 or 90000-100000. Within the above range, a larger number average molecular weight of the polyphenylene sulfide resin is beneficial to improving its rigidity, and is beneficial to making the harmonica tube have good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, and a smaller number average molecular weight of the polyphenylene sulfide resin is beneficial to improving its processing performance, and is convenient for reducing the difficulty of extrusion processing with a toughening agent.

[0062] The number average molecular weight of the polyphenylene sulfide resin in the embodiment of the present application is at least 50,000, and its viscosity is relatively high, which facilitates extrusion processing and molding. In addition, the polyphenylene sulfide resin with a large number average molecular weight has high rigidity, which is conducive to the harmonica tube formed therefrom having good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation performance, and creep resistance and other properties.

[0063] In some embodiments, the number average molecular weight of the polyphenylene sulfide resin is 50,000 to 10,000.

[0064] The number average molecular weight of the polyphenylene sulfide resin in the embodiment of the present application is 50,000 to 10,000, which is conducive to the harmonica tube formed having good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation performance, creep resistance and other properties.

[0065] In some embodiments, the polyphenylene sulfide composition includes 80 to 90 parts by weight of polyphenylene sulfide resin and 10 to 20 parts by weight of toughening agent.

[0066] In any embodiment, the raw material, in terms of weight, the polyphenylene sulfide resin may be 80 weight parts, 81 weight parts, 82 weight parts, 83 weight parts, 84 weight parts, 85 weight parts, 86 weight parts, 87 weight parts, 88 weight parts, 89 weight parts, 90 weight parts, or a range consisting of any two of the above values. For example, the raw material, in terms of weight, the polyphenylene sulfide resin may be 80 weight parts to 85 weight parts, 83 weight parts to 88 weight parts, 85 weight parts to 90 weight parts. Within the above range, a smaller weight of the polyphenylene sulfide resin is beneficial to increasing the toughness of the harmonica tube, reducing the occurrence of extrusion material breakage and poor extrusion process that are easy to occur during the extrusion molding process of the harmonica tube, and a larger weight of the polyphenylene sulfide resin is beneficial to increasing the rigidity of the harmonica tube and improving the dimensional stability of the harmonica tube. In any embodiment, the raw material can be 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, or a range consisting of any two of the above values. For example, the raw material can be 10 parts by weight to 15 parts by weight, 12 parts by weight to 18 parts by weight, or 15 parts by weight to 20 parts by weight. Within the above range, a larger part by weight of the toughening agent is beneficial to increase the toughness of the harmonica tube and reduce the occurrence of extrusion material breakage and poor extrusion process that are easy to occur during the extrusion molding process of the harmonica tube. A smaller part by weight of the toughening agent is beneficial to making the rigidity of the harmonica tube larger and improving the dimensional stability of the harmonica tube.

[0067] In some embodiments, the polyphenylene sulfide resin has a melt index of 55 g / 10 min to 125 g / 10 min at 316° C. / 10 kg.

[0068] Among them, the full name of melt index is melt flow index or melt flow index, which is a value indicating the fluidity of plastic materials during processing. It was developed by the American Measurement Standards Association (ASTM) based on the method used by DuPont to identify plastic properties. The test method is: first melt the plastic pellets into plastic fluid, and then measure the grams (g) of the plastic fluid flowing out through a 2.1mm diameter tube within a certain time (10 minutes), at a certain temperature and pressure (different standards for various materials). The larger the value, the better the processing fluidity of the plastic material, and vice versa.

[0069] In any embodiment, the melt index of the polyphenylene sulfide resin at 316°C / 10kg can be 55g / 10min, 60g / 10min, 65g / 10min, 70g / 10min, 75g / 10min, 80g / 10min, 85g / 10min, 90g / 10min, 95g / 10min, 100g / 10min, 105g / 10min, 110g / 10min, 115g / 10min, 120g / 10min, 125g / 10min, or a range consisting of any two of the above values. For example, the melt index of the polyphenylene sulfide resin at 316°C / 10kg can be 55g / 10min-100g / 10min, 80g / 10min-110g / 10min or 100g / 10min-125g / 10min. Within the above range, a larger melt index is beneficial to improving the fluidity of the polyphenylene sulfide resin and reducing the occurrence of extrudate breakage and poor extrusion process that are prone to occur during the extrusion molding process. A smaller melt index is beneficial to improving the rigidity of the polyphenylene sulfide resin and improving the mechanical strength and dimensional stability of the harmonica tube.

[0070] In some embodiments, the copolymer of olefin and glycidyl ester includes one or more of ethylene-glycidyl methacrylate (E-GMA), ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA), ethylene octene copolymer grafted with glycidyl methacrylate (POE-GMA), and styrene-butadiene-styrene block copolymer grafted with glycidyl methacrylate (SBS-GMA).

[0071] In the embodiments of the present application, the copolymer of olefin and glycidyl ester provided above has a toughening effect on the polyphenylene sulfide resin, which helps to reduce the occurrence of extruded material breakage and poor extrusion process during the extrusion molding process of the harmonica tube.

[0072] In some embodiments, the copolymer of olefin and glycidyl ester has a melt index of 4 g / 10 min to 10 g / 10 min at 190° C. / 2.16 kg.

[0073] In any embodiment, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K can be 4g / 10min, 4.5g / 10min, 5g / 10min, 5.5g / 10min, 6g / 10min, 6.5g / 10min, 7g / 10min, 7.5g / 10min, 8g / 10min, 8.5g / 10min, 9g / 10min, 9.5g / 10min, 10g / 10min, or a range consisting of any two of the above values. For example, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K can be 4g / 10min-6g / 10min, 6g / 10min-8g / 10min or 8g / 10min-10g / 10min. Within the above range, a larger melt index is beneficial to improving the fluidity of the copolymer of olefin and glycidyl ester and improving its affinity with polyphenylene sulfide resin, while a smaller melt index is beneficial to improving its performance of toughening polyphenylene sulfide resin and reducing the occurrence of extruded material breakage and poor extrusion process that are prone to occur during the extrusion molding of the harmonica tube.

[0074] In some embodiments, the polyphenylene sulfide composition further includes an antioxidant.

[0075] Among them, the antioxidant is used as an auxiliary agent to delay the oxidation process of polyphenylene sulfide resin during the manufacturing, processing, storage and application of harmonica tubes.

[0076] In the embodiments of the present application, the addition of antioxidants is helpful to delay the aging of the harmonica tube and increase the service life of the harmonica tube.

[0077] In some embodiments, the polyphenylene sulfide composition further comprises up to 0.5 parts by weight of an antioxidant.

[0078] In any embodiment, the polyphenylene sulfide composition may further include 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50 parts by weight of an antioxidant, or a range consisting of any two of the above values, for example, the polyphenylene sulfide composition may further include 0 to 0.20, 0.20 to 0.50, 0.30 to 0.45 parts by weight of an antioxidant. Within the above range, a smaller antioxidant weight portion is beneficial to improving the uniformity of the distribution of the antioxidant in the polyphenylene sulfide resin, reducing the raw material cost of the antioxidant, reducing the resource loss and environmental pollution caused by the antioxidant, and a larger antioxidant weight portion is beneficial to delaying the aging process of the harmonica tube and increasing the service life of the harmonica tube.

[0079] In some embodiments, the polyphenylene sulfide composition further comprises 0.2 to 0.5 parts by weight of an antioxidant.

[0080] The embodiments of the present application are within the above-mentioned weight range of the antioxidant, which is beneficial to improving the uniformity of the distribution of the antioxidant in the polyphenylene sulfide resin, delaying the aging process of the harmonica tube, and increasing the service life of the harmonica tube.

[0081] In some embodiments, the antioxidant includes one or both of N,N′-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and / or tris[2,4-di-tert-butylphenyl]phosphite.

[0082] Among them, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine refers to antioxidant 1098, and its CAS number (substance digital identification number, Chemical Abstracts Service) is 23128-74-7. Tris[2,4-di-tert-butylphenyl]phosphite refers to antioxidant 168, and its CAS number is 31570-04-4.

[0083] Wherein, the antioxidant may include only N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, may include only tris[2.4-di-tert-butylphenyl]phosphite, or may include N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2.4-di-tert-butylphenyl]phosphite. In any embodiment, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2.4-di-tert-butylphenyl]phosphite may be mixed in any proportion. For example, the weight ratio of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine to tris[2,4-di-tert-butylphenyl]phosphite can be 1:0, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 0:1, 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, or a range consisting of any two of the above values. For example, the weight ratio of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2.4-di-tert-butylphenyl]phosphite can be (0.4-0.6):(0.4-0.6), (0.6-0.8):(0.6-0.8), (0.5-1):(0.1-0.4).

[0084] In a second aspect, an embodiment of the present application provides a method for preparing a harmonica tube, comprising:

[0085] Provide a preparation of a polyphenylene sulfide composition;

[0086] The polyphenylene sulfide composition is molded to obtain a harmonica tube;

[0087] The polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; the toughening agent comprises a copolymer of olefin and glycidyl ester.

[0088] In the embodiments of the present application, a harmonica tube is formed by processing polyphenylene sulfide resin and a copolymer of olefin and glycidyl ester as raw materials. The formed harmonica tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, and is not prone to cracking when squeezed during use, which is beneficial to improving production capacity and product quality.

[0089] In some embodiments, the step of molding the polyphenylene sulfide composition comprises:

[0090] The polyphenylene sulfide composition is added into a twin-screw extruder for extrusion molding.

[0091] In some embodiments, the polyphenylene sulfide resin and the toughening agent are mixed to form a premix; the premix is ​​added to a twin-screw extruder for extrusion molding, and the polyphenylene sulfide resin and the toughening agent can be added from different feed ports and enter the screw to form a premix. In some embodiments, the process parameters of the extrusion molding are set and adjusted accordingly according to the properties of the polyphenylene sulfide resin and the toughening agent.

[0092] The embodiment of the present application prepares the harmonica tube through an extrusion molding process, which has the advantages of continuous production and high efficiency.

[0093] In some embodiments, the ratio of the length to the diameter of the screw of the twin-screw extruder is 40, 48, or 64.

[0094] In some embodiments, the screw of the twin-screw extruder is provided with more than two shear block areas and one reverse thread area, so that the material pile is more dense and the injection molding appearance is better.

[0095] In some embodiments, the angle of the screw bonding block of the twin-screw extruder is 30°, 45°, 60° and / or 90°, and the larger the angle, the stronger the shear force.

[0096] In some embodiments, the external cooling water temperature of the twin-screw extruder is between 40°C and 60°C.

[0097] In some embodiments, the screw speed of the twin-screw extruder is 300rpm to 500rpm. In any embodiment, the screw speed of the twin-screw extruder can be 300rpm, 350rpm, 400rpm, 450rpm, 500rpm, or a range composed of any two of the above values. For example, the screw speed of the twin-screw extruder can be 300rpm to 400rpm, 350rpm to 450rpm or 400rpm to 500rpm. In the embodiments of the present application, by regulating the screw speed of the twin-screw extruder, it is beneficial to make the extrusion working condition of the polyphenylene sulfide resin and the toughening agent good.

[0098] In some embodiments, the zone temperature settings of the twin-screw extruder include: zone one temperature 100℃~120℃, zone two temperature 280℃~290℃, zone three temperature 290℃~310℃, zone four temperature 300℃~310℃, zone five temperature 290℃~300℃, zone six temperature 290℃~300℃, zone seven temperature 300℃~310℃, zone eight temperature 300℃~310℃, zone nine temperature 290℃~310℃, and die head temperature 300℃~320℃.

[0099] In the embodiments of the present application, by setting the above-mentioned extrusion molding process parameters, the extruded material of the polyphenylene sulfide composition is not prone to breakage or poor extrusion process during the process of forming a harmonica tube, so that the formed harmonica tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, and is not prone to cracking when squeezed during use, which is beneficial to improving production capacity and product quality.

[0100] In a third aspect, an embodiment of the present application provides a liquid cooling plate, the liquid cooling plate comprising any harmonica tube provided in the first aspect or a harmonica tube produced by the preparation method provided in the second aspect.

[0101] Among them, the liquid cooling plate is used to discharge the heat generated by the battery cells in high temperature or fast charging environment, reduce high temperature alarms and safety accidents caused by heat accumulation in the battery module, maintain the battery cells in a relatively constant temperature working environment, and extend the service life of the battery cells.

[0102] In the embodiments of the present application, the provided liquid cooling plate, when containing the given harmonica tube, has at least the same advantages as the harmonica tube, and has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, etc., which reduces the risk of cracking when squeezed during use, and improves production capacity and product quality.

[0103] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0104] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0105] Please refer to Figure 2-3 , Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application, Figure 3 A schematic diagram of the structure of a liquid cooling assembly provided for some embodiments of the present application. The battery 100 includes any liquid cooling plate 30 provided in the embodiments of the present application and at least two relatively arranged battery cells 20, and the liquid cooling plate 30 is arranged between two adjacent battery cells 20. The liquid cooling plate 30 includes any harmonica tube provided in the first aspect or a harmonica tube prepared by the preparation method provided in the second aspect, and a cooling medium filled in the harmonica tube. The battery 100 also includes a housing 10, and the battery cells 20 are accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cells 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 together define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in various shapes, such as a cylinder, a cuboid, etc. In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.

[0106] A plurality of battery cells 20 can be directly connected in series, in parallel or in a hybrid connection, and then the whole formed by the plurality of battery cells 20 can be accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting a plurality of battery cells 20 in series, in parallel or in a hybrid connection, and then the plurality of battery modules are connected in series, in parallel or in a hybrid connection to form a whole, and then accommodated in the box 10. The battery 100 can also include other structures. For example, the battery 100 can also include a confluence component for realizing electrical connection between the plurality of battery cells 20. Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular or in other shapes.

[0107] Please refer to Figure 4 , Figure 4 The schematic diagram of the decomposition structure of a battery cell provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that constitutes a battery. Figure 4, the battery cell 20 includes an end cap 21, a shell 22, a battery cell assembly 23 and other functional components. The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the battery cell assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 21, and the insulating member can be used to isolate the electrical connection components in the shell 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc. The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the battery cell assembly 23, electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the end cap 21 is closed at the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 is closed to the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the battery cell assembly 23. The shell 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. The battery cell assembly 23 is a component in the battery cell 100 where an electrochemical reaction occurs. One or more battery cell assemblies 23 may be included in the shell 22. The battery cell assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a diaphragm is usually provided between the positive electrode sheet and the negative electrode sheet. The part of the positive electrode sheet and the negative electrode sheet with active substances constitutes the main body of the battery cell assembly, and the part of the positive electrode sheet and the negative electrode sheet without active substances each constitutes a pole ear 23a. The positive pole ear and the negative pole ear can be located at one end of the main body or at both ends of the main body respectively.During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 23a connects the electrode terminal to form a current loop.

[0108] The beneficial effects of the present application are further illustrated below in conjunction with embodiments.

[0109] In order to make the technical problems, technical solutions and beneficial effects solved by the embodiments of the present application clearer, the following will be further described in detail with reference to the embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its applications. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0110] The raw materials used in the following examples and comparative examples were commercially available unless otherwise specified.

[0111] 1. Prepare the harmonica tube:

[0112] Example 1

[0113] 9.5 kg of a polyphenylene sulfide resin (commercially available) with a number average molecular weight of 70,000 and a melt index of 100 g / 10 min at 316° C. / 10 kg was added to the main feed of a twin-screw extruder, and 0.5 kg of ethylene-methacrylate glycidyl ester (commercially available) with a melt index of 7 g / 10 min at 190° C. / 2.16 kg was added to the screw through a side feeder, and melt extrusion was performed to obtain a polyphenylene sulfide composition for a harmonica tube. The polyphenylene sulfide composition was molded to obtain a harmonica tube. The molding process is melt extrusion molding, wherein the process parameters of melt extrusion are: temperature setting of zone 1: 110°C, temperature setting of zone 2: 285°C, temperature setting of zone 3: 300°C, temperature setting of zone 4: 305°C, temperature setting of zone 5: 295°C, temperature setting of zone 6: 295°C, temperature setting of zone 7: 300°C, temperature setting of zone 8: 300°C, temperature setting of zone 9: 300°C, temperature setting of die head: 310°C, and screw speed of 400rpm. The ratio L / D of the screw length and diameter of the twin-screw extruder is 48. Two shear block areas and one reverse thread area are provided on the screw. The angle of the bonding block of the screw is 90°+45°. It can be understood that the sum of the masses of polyphenylene sulfide resin and ethylene-methacrylate glycidyl ester in this embodiment is 10kg, and 0.1kg is 1 part by weight. The specific target components of each embodiment and comparative example are shown in Table 1.

[0114] Examples 2 to 7 are similar to Example 1, except that the mass ratio of the polyphenylene sulfide resin to ethylene-glycidyl methacrylate in the examples is different from that in Example 1. It should be noted that the sum of the masses of the polyphenylene sulfide resin and ethylene-glycidyl methacrylate in Examples 2 to 7 is the same as the sum of the masses of the polyphenylene sulfide resin and ethylene-glycidyl methacrylate in Example 1.

[0115] Examples 8 to 13 are similar to Example 4, except that the number average molecular weight and the melt index of the polyphenylene sulfide resin at 316° C. / 10 kg in the examples are different from those in Example 4.

[0116] Examples 14 to 18 are similar to Example 4, except that the melt index of ethylene-glycidyl methacrylate in the examples is different from that in Example 4 under the condition of 190° C. / 2.16 kg.

[0117] Example 19 is similar to Example 4, except that: 0.2 parts (0.2 kg) of antioxidant 1098 (N, N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, C 40 H 64 N2O4).

[0118] Examples 20 to 21 are similar to Example 19, except that the types and weights of the antioxidants added in the examples are different from those in Example 19. It should be noted that the Chinese name of the antioxidant 168 in Example 21 is tris[2.4-di-tert-butylphenyl]phosphite, and the molecular formula is C 42 H 63 O3P.

[0119] Examples 22 to 24 are similar to Example 4, except that the types of toughening agents added in the examples are different from those in Example 4.

[0120] 2. Test of number average molecular weight of polyphenylene sulfide resin:

[0121] The number average molecular weight of polyphenylene sulfide resin is measured by using an osmometer including a measuring cell, a semipermeable membrane and an osmotic pressure converter. The measuring cell is divided into two parts by a semipermeable membrane. The upper half is open to the outside world and filled with the solution to be measured, and the lower half is filled with a solvent and isolated from the outside world. The solvent gives a negative osmotic pressure corresponding to the osmotic concentration of the sample solution. The stainless steel diaphragm installed in the lower half of the measuring cell is slightly bent due to the negative osmotic pressure. This bending movement is recorded by the pressure regulating system and converted into an electrical signal. The signal size has a quantitative relationship with the osmotic pressure of the solution. Three or more solutions of different concentrations to be tested are injected into the upper part of the measuring cell. According to the number of scales moved by the recording pen on the recording paper, the value π of the solvent liquid column in centimeters corresponding to the osmotic pressure of each solution is obtained. The measured π value is divided by the concentration C, and π / C is plotted against C to calculate the number average molecular weight of the polyphenylene sulfide resin.

[0122] 3. Sample testing:

[0123] The harmonica tubes prepared in each embodiment are made into strips, the length of the strips is 150mm, the width of the end is 20mm, and the thickness is 4mm. According to ISO 527-2:2012 "Plastic Tensile Test", the tensile strength and elongation at break of the strips are tested, according to ISO178:2019 "Test of Plastic Bending Properties", the bending strength and bending modulus of the strips are tested, according to ISO 180 "Determination of Plastic Impact Strength", the cantilever beam notched impact strength of the strips is tested, according to ASTM D5930-17 standard test method for measuring thermal conductivity of plastics using transient line source technology, the sample is pre-dried at 75°C for 4h, and then the sample is placed in a test environment with a constant initial temperature, and a line source is set at the center of the sample to be tested. The line source probe can accurately record temperature transients, and the test device is heated by a heat source with a certain temperature variable, and the thermal conductivity of the strip is calculated according to the relationship between the temperature increase variable and the polymer temperature transient. The test process of other embodiments is the same as above.

[0124] Table 1 Sample parameters and performance test results of various embodiments and comparative examples

[0125]

[0126]

[0127] Note: The melt index of polyphenylene sulfide resin refers to the melt index of polyphenylene sulfide resin at 316℃ / 10kg, and the unit is g / 10min; the melt index of toughening agent refers to the melt index of copolymer of olefin and glycidyl ester at 190℃ / 2.16kg, and the monomer is g / 10min.

[0128] The results show that the elongation at break and the cantilever notch impact strength of the comparative example 1 without adding the toughening agent are low. In the process of extruding the harmonica tube, the extruded material is prone to breakage and the extrusion process is not smooth. The product is prone to cracking when it is squeezed during use. Compared with the comparative example 1, the elongation at break and the cantilever notch impact strength of the harmonica tube material of Example 4 are significantly improved, and the tensile strength, bending strength, bending modulus and thermal conductivity still have high values, which is conducive to reducing the occurrence of situations such as breakage of the extruded material and the extrusion process being not smooth during the extrusion molding of the harmonica tube, reducing the risk of cracking when it is squeezed during use, and improving production capacity and product quality.

[0129] From Examples 1 to 7, it can be seen that when the mass ratio of the toughening agent to the polyphenylene sulfide resin increases, the elongation at break and the cantilever beam notched impact strength of the harmonica tube material are significantly increased, and the tensile strength, flexural strength, flexural modulus and thermal conductivity are reduced to a certain extent. Therefore, by adjusting the mass ratio of the polyphenylene sulfide resin to the toughening agent, the occurrence of extruded material breakage and poor extrusion process during the extrusion molding of the harmonica tube can be reduced to a greater extent, the risk of cracking during extrusion during use can be reduced, and production capacity and product quality can be improved.

[0130] From Examples 4, 8 to 13, it can be seen that when the number average molecular weight of the polyphenylene sulfide resin increases, the melt index decreases, and the elongation at break, cantilever beam notched impact strength, tensile strength, flexural strength, flexural modulus and thermal conductivity of the harmonica tube material are significantly improved. Therefore, regulating the number average molecular weight of the polyphenylene sulfide resin can reduce the occurrence of extruded material breakage and poor extrusion process during the extrusion molding of the harmonica tube to a greater extent, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0131] From Examples 4 and 14 to 18, it can be seen that when the melt index of the toughening agent increases, the melt index decreases, and the elongation at break and the cantilever beam notched impact strength, tensile strength, flexural strength, flexural modulus and thermal conductivity of the harmonica tube material all have certain fluctuations. Therefore, regulating the melt index of the toughening agent can reduce the occurrence of extruded material breakage and poor extrusion process during the extrusion molding of the harmonica tube to a greater extent, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0132] From Examples 4 and 19-21, it can be seen that when other additives are added, the elongation at break and the cantilever beam notched impact strength, tensile strength, flexural strength, flexural modulus and thermal conductivity of the harmonica tube material all have certain fluctuations. Therefore, regulating the type of additives and the added proportion can reduce the occurrence of extruded material breakage and poor extrusion process during the extrusion molding of the harmonica tube to a greater extent, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0133] From Examples 4 and 22 to 24, when other copolymers of olefins and glycidyl esters are used, the elongation at break and cantilever beam notched impact strength, tensile strength, flexural strength, flexural modulus and thermal conductivity of the harmonica tube material all have certain fluctuations. Therefore, regulating the type of copolymers of olefins and glycidyl esters can reduce the occurrence of extruded material breakage and poor extrusion process during the extrusion molding of the harmonica tube to a greater extent, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0134] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0135] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0136] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A harmonica pipe, characterized in that: The material of the harmonica pipe includes a polyphenylene sulfide composition, and the polyphenylene sulfide composition includes a polyphenylene sulfide resin and a toughening agent; the toughening agent includes a copolymer of olefin and glycidyl ester.

2. The harmonica pipe according to claim 1, characterized in that: The number average molecular weight of the polyphenylene sulfide resin is at least 50,000.

3. The harmonica pipe according to claim 2, characterized in that: The number average molecular weight of the polyphenylene sulfide resin is 50,000 to 10,000.

4. The harmonica pipe according to any one of claims 1 to 3, characterized in that: The polyphenylene sulfide composition comprises 80 to 90 parts by weight of polyphenylene sulfide resin and 10 to 20 parts by weight of a toughening agent.

5. The harmonica pipe according to any one of claims 1 to 4, characterized in that: The polyphenylene sulfide resin has a melt index of 55 g / 10 min to 125 g / 10 min at 316° C. / 10 kg.

6. The harmonica pipe according to any one of claims 1 to 5, characterized in that: The copolymer of olefin and glycidyl ester includes one or more of ethylene-glycidyl methacrylate, ethylene-methyl acrylate-glycidyl methacrylate terpolymer, ethylene octene copolymer grafted with glycidyl methacrylate, and styrene-butadiene-styrene block copolymer grafted with glycidyl methacrylate.

7. The harmonica pipe according to any one of claims 1 to 6, characterized in that: The copolymer of olefin and glycidyl ester has a melt index of 4 g / 10 min to 10 g / 10 min under the condition of 190° C. / 2.16 kg.

8. The harmonica pipe according to any one of claims 1 to 7, characterized in that: The polyphenylene sulfide composition also includes an antioxidant.

9. The harmonica pipe according to claim 8, characterized in that: The polyphenylene sulfide composition further comprises at most 0.5 parts by weight of an antioxidant.

10. The harmonica pipe according to claim 9, characterized in that: The polyphenylene sulfide composition further comprises 0.2 to 0.5 parts by weight of an antioxidant.

11. The harmonica pipe according to claim 9 or 10, characterized in that: The antioxidant includes N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and / or tris[2,4-di-tert-butylphenyl]phosphite.

12. A method for preparing a harmonica tube, characterized in that: include: Providing a polyphenylene sulfide composition; The polyphenylene sulfide composition is molded to obtain a harmonica tube; The polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; the toughening agent comprises a copolymer of olefin and glycidyl ester.

13. The method for preparing a harmonica pipe according to claim 12, characterized in that: The step of molding the polyphenylene sulfide composition comprises: The polyphenylene sulfide composition is added into a twin-screw extruder for extrusion molding.

14. The method for preparing a harmonica pipe according to claim 13, characterized in that: The screw speed of the twin-screw extruder is 300 rpm to 500 rpm; and / or, The zone temperature settings of the twin-screw extruder include: zone one temperature 100°C to 120°C, zone two temperature 280°C to 290°C, zone three temperature 290°C to 310°C, zone four temperature 300°C to 310°C, zone five temperature 290°C to 300°C, zone six temperature 290°C to 300°C, zone seven temperature 300°C to 310°C, zone eight temperature 300°C to 310°C, zone nine temperature 290°C to 310°C, and die head temperature 300°C to 320°C.

15. A liquid cooling plate, characterized in that: The liquid cooling plate comprises the harmonica pipe according to any one of claims 1 to 11 or the harmonica pipe prepared by the preparation method according to any one of claims 12 to 14.

16. A battery, characterized in that: Comprising the liquid cooling plate of claim 15.

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

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