Harmonica-shaped tube and manufacturing method, liquid cooling plate, battery, and electric device

Abstract

The present application discloses a harmonica-shaped tube and a manufacturing method, a liquid cooling plate, a battery, and an electric device. The material of the harmonica-shaped tube comprises a polyphenylene sulfide composition, and the polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; and the toughening agent comprises a copolymer of olefin and glycidyl ester. In the present application, the polyphenylene sulfide composition is provided as the material of the harmonica-shaped tube, facilitating reduction of the conditions of breakage of extrudate, unsmooth extrusion and the like in the process of extrusion molding. Therefore, the formed harmonica-shaped tube has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, creep resistance and other properties, reducing the risk of cracking during pressing in the using process, and improving the production capacity and the product quality.

Description

Harmonica pipe and preparation method, liquid cooling plate, battery, and electrical equipment

[0001] This application claims priority to Chinese patent application No. 2024100632452, filed on January 16, 2024, entitled “Harmonica tube and preparation method, liquid cooling plate, battery, and electrical equipment,” which is incorporated herein by reference in its entirety. Technical Field

[0002] The present application belongs to the field of battery technology, and specifically relates to a harmonica pipe and a preparation method, a liquid cooling plate, a battery, and electrical equipment. Background Art

[0003] This section merely provides background information related to the present application and is not necessarily prior art.

[0004] Batteries, as a new generation of green energy storage and conversion devices, have been widely used in portable electronic devices and electric vehicles. A battery's heat dissipation capacity is crucial for its proper operation. Liquid cooling plates are typically placed between battery cells to dissipate heat. Currently, improvements are still needed in terms of material selection, molding, and performance.

[0005] Summary of the Invention

[0006] The main technical problem to be solved by this application is that there is still room for improvement in the material selection, molding, performance indicators and other aspects of the liquid cooling plate.

[0007] 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.

[0008] In the embodiments of the present application, a polyphenylene sulfide resin is modified by a toughening agent to form a polyphenylene sulfide composition. The polyphenylene sulfide composition is suitable for extrusion molding, which simplifies the processing technology. The harmonica tube formed has good product performance, for example, good dimensional stability, surface accuracy, mechanical properties (such as strength, toughness and elongation at break, etc.), deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, etc., which can meet the product working conditions, reduce the occurrence of extruded material breakage and poor extrusion during the extrusion molding process, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0009] In some embodiments, the polyphenylene sulfide resin has a number average molecular weight greater than or equal to 50,000.

[0010] The polyphenylene sulfide resin of the embodiment of the present application has a number average molecular weight greater than or equal to 50,000, and its viscosity is relatively high, which facilitates the extrusion processing and molding of the harmonica tube. In addition, the polyphenylene sulfide resin with a number average molecular weight greater than or equal to 50,000 has high rigidity, which is beneficial for the formed harmonica tube to have good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance.

[0011] In some embodiments, the number average molecular weight of the polyphenylene sulfide resin is 50,000 to 10,000.

[0012] The number average molecular weight of the polyphenylene sulfide resin in the embodiment of the present application satisfies 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 and creep resistance.

[0013] In some embodiments, the polyphenylene sulfide composition comprises 80 to 90 parts by weight of polyphenylene sulfide resin and 10 to 20 parts by weight of toughening agent.

[0014] In any embodiment, the polyphenylene sulfide resin may be 80 parts by weight, 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight, 85 parts by weight, 86 parts by weight, 87 parts by weight, 88 parts by weight, 89 parts by weight, or 90 parts by weight, or a range consisting of any two of the above values. For example, the polyphenylene sulfide resin may be 80 parts by weight to 85 parts by weight, 83 parts by weight to 88 parts by weight, or 85 parts by weight to 90 parts by weight. Within the above ranges, a lower amount of polyphenylene sulfide resin is beneficial for improving the toughness of the formed harmonica tube and reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process. A higher amount of polyphenylene sulfide resin is beneficial for improving the rigidity of the formed harmonica tube and enhancing the dimensional stability of the harmonica tube. In any embodiment, the raw material can contain 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, or 20 parts by weight, or a range consisting of any two of the above values. For example, the raw material can contain 10 to 15 parts by weight, 12 to 18 parts by weight, or 15 to 20 parts by weight. Within the above range, a higher amount of toughening agent is beneficial to improving the toughness of the harmonica tube and reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process. A lower amount of toughening agent is beneficial to improving the rigidity of the harmonica tube and improving the dimensional stability of the formed harmonica tube.

[0015] 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.

[0016] In any embodiment, the melt index of the polyphenylene sulfide resin at 316°C / 10kg may satisfy 55 g / 10min, 60 g / 10min, 65 g / 10min, 70 g / 10min, 75 g / 10min, 80 g / 10min, 85 g / 10min, 90 g / 10min, 95 g / 10min, 100 g / 10min, 105 g / 10min, 110 g / 10min, 115 g / 10min, 120 g / 10min, 125 g / 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 may be 55 g / 10min-100 g / 10min, 80 g / 10min-110 g / 10min, or 100 g / 10min-125 g / 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 during the extrusion molding process. A smaller melt index is beneficial to improving the rigidity of the polyphenylene sulfide resin and increasing the mechanical strength and dimensional stability of the harmonica tube formed.

[0017] 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).

[0018] In the embodiments of the present application, the provided copolymer of olefin and glycidyl ester is used to improve the toughness of the polyphenylene sulfide composition, thereby reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process.

[0019] 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.

[0020] In any embodiment, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K may satisfy 4 g / 10min, 4.5 g / 10min, 5 g / 10min, 5.5 g / 10min, 6 g / 10min, 6.5 g / 10min, 7 g / 10min, 7.5 g / 10min, 8 g / 10min, 8.5 g / 10min, 9 g / 10min, 9.5 g / 10min, 10 g / 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 may satisfy 4 g / 10min-6 g / 10min, 6 g / 10min-8 g / 10min, or 8 g / 10min-10 g / 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 ability to toughen polyphenylene sulfide resin and reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process.

[0021] In some embodiments, the polyphenylene sulfide composition further includes an antioxidant.

[0022] In the embodiments of the present application, antioxidants are added to delay the aging of the harmonica tube and increase the service life of the harmonica tube.

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

[0024] In any embodiment, the polyphenylene sulfide composition may further include, by weight, 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, or 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, by weight, 0 to 0.20, 0.20 to 0.50, or 0.30 to 0.45 parts by weight of an antioxidant. Within the above ranges, a smaller amount of antioxidant is beneficial for improving the uniformity of the antioxidant distribution in the polyphenylene sulfide resin, reducing the raw material cost of the antioxidant, and reducing resource loss and environmental pollution caused by the use of the antioxidant. A larger amount of antioxidant is beneficial for delaying the aging process of the harmonica tube and increasing the service life of the harmonica tube.

[0025] In some embodiments, the polyphenylene sulfide composition further comprises 0.2 to 0.5 parts by weight of an antioxidant.

[0026] The embodiments of the present application are within the above-mentioned range of weight parts 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.

[0027] In some embodiments, the antioxidant includes one or both of N,N′-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2,4-di-tert-butylphenyl]phosphite.

[0028] The antioxidant may include only N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, only tris[2,4-di-tert-butylphenyl]phosphite, or both. In some embodiments, 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 may be 0-1:0-1. In some embodiments, 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 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).

[0029] In a second aspect, an embodiment of the present application provides a method for preparing a harmonica tube, comprising:

[0030] Provided is a preparation method for a polyphenylene sulfide composition;

[0031] The polyphenylene sulfide composition is molded to obtain a harmonica tube;

[0032] The polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; the toughening agent comprises a copolymer of olefin and glycidyl ester.

[0033] In the embodiments of the present application, the harmonica tube made of a polyphenylene sulfide composition has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance, which is beneficial to reducing the risk of cracking due to extrusion during use and improving production capacity and product quality.

[0034] In some embodiments, the step of molding the polyphenylene sulfide composition includes:

[0035] The polyphenylene sulfide composition is added into a twin-screw extruder for extrusion molding.

[0036] The embodiment of the present application is to prepare the harmonica tube through an extrusion molding process, which has the advantages of continuous production and high efficiency.

[0037] In some embodiments, the screw speed of the twin-screw extruder is 300 rpm to 500 rpm.

[0038] 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℃.

[0039] In the embodiments of the present application, by setting the above-mentioned extrusion molding process parameters, it is less likely that the extruded material will break or the extrusion will be poor during the formation of the harmonica tube. The harmonica tube formed has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, which is beneficial to reducing the risk of cracking due to extrusion during use and improving production capacity and product quality.

[0040] In a third aspect, an embodiment of the present application provides a liquid cooling plate, which includes any harmonica tube provided in the first aspect or a harmonica tube produced by the preparation method provided in the second aspect.

[0041] In a fourth aspect, an embodiment of the present application provides a battery, comprising the liquid cooling plate provided in the third aspect.

[0042] In a fifth aspect, embodiments of the present application provide an electrical device comprising the battery provided in the fourth aspect. When the battery of the electrical device uses the provided liquid cooling plate, it has at least the same advantages as the battery, and can improve the heat dissipation performance of the electrical device.

[0043] 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

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. 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 creative work.

[0045] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0046] FIG2 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0047] FIG3 is a schematic structural diagram of a liquid cooling assembly provided in some embodiments of the present application;

[0048] FIG4 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0049] Explanation of the accompanying figures: 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-housing, 23-electrode assembly, 21a-electrode terminal, 23a-ear, 401-end plate, 402-side plate. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and effect of this application clearer and more specific, the following embodiments of the technical solution of this application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, 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), similarly, "multiple groups" refers to more than two (including two), and "multiple pieces" refers to more than two (including two), unless otherwise clearly and specifically defined.

[0053] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0055] Amounts, ratios, and other numerical values ​​are presented herein in a range format. It should be understood that such range format is used for convenience and brevity and should be interpreted flexibly 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.

[0056] Harmonica tubes are used in the heat dissipation field of new energy batteries and are important components that affect the battery life, range, and other functions of new energy batteries. Harmonica tubes usually have multiple heat exchange medium flow channels so that the heat exchange medium can receive and transfer heat through the flow channels. Currently, some harmonica tubes are made of metal materials, such as aluminum. The molding process of this solution is relatively complex 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 raw material costs, and they are easy to have good insulation properties. However, general plastic materials are easily corroded by heat exchange media, which accelerates the aging of the harmonica tube and may cause the harmonica tube to crack, affecting the normal use of the harmonica tube and reducing the service life of the harmonica tube. For example, in a harmonica tube made of polyamide, the amide bonds in the polyamide easily form reactive functional groups such as hydrogen bonds. These functional groups easily react with heat exchange media such as water and ethylene glycol, making the harmonica tube susceptible to corrosion by the heat exchange media. In addition, the harmonica tube made of polyamide has a segmented structure, so the mechanical strength, deformation resistance, heat resistance and creep resistance of the harmonica tube are relatively low.

[0057] Due to the complex structure of harmonica pipes, some solutions utilize extrusion molding to form harmonica pipes made of plastic. This simple and efficient molding process is suitable for the unique shapes of harmonica pipes. However, during the extrusion molding process, if the plastic material is too flexible, the mechanical properties of the harmonica pipe may be poor, making it difficult to meet product requirements. If the plastic material is too rigid, the tensile strength may be too high and the elongation at break may be too low, leading to problems such as broken extrudates and poor extrusion during the extrusion molding process, thus affecting production capacity and product quality.

[0058] 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, and the toughening agent includes a copolymer of an olefin and a glycidyl ester.

[0059] Polyphenylene sulfide (PPS) resin is a thermoplastic resin whose main chain consists of benzene rings alternately linked by sulfur atoms. The overlapping π electrons of the benzene rings further reduce their energy, forming a stable conjugated structure. The benzene ring structure imparts excellent mechanical properties, deformation resistance, heat resistance, and creep resistance to PPS resin. The sulfide bonds provide flexibility and fracture resistance, facilitating the extrusion of harmonica pipes. The number-average molecular weight (NAM) measures the molecular size of PPS resin, calculated by the number of molecules—that is, the ratio of the total molecular mass to the total number of molecules. PPS resins come in both low and high molecular weight varieties. Low molecular weight PPS resins can have a NAM between 4,000 and 5,000, making them difficult to mold directly. High molecular weight PPS resins can have a NAM greater than 10,000, allowing them to be used directly in plastic products without crosslinking. Tougheners are substances that increase the flexibility of PPS resins. A copolymer of olefin and glycidyl ester refers to a product formed by the copolymerization of olefin and glycidyl ester. When the copolymer of olefin and glycidyl ester is used as a toughening agent to toughen polyphenylene sulfide resin, the epoxy bonds in the glycidyl ester undergo a ring-opening reaction, and an alcohol-acid esterification reaction occurs with the end groups of the polyphenylene sulfide resin. This connects the molecular chains of the copolymer of olefin and glycidyl ester to the molecular chains of polyphenylene sulfide, increasing the flexibility of the chain segments of the polyphenylene sulfide resin. Furthermore, since the copolymer of olefin and glycidyl ester also contains olefin segments, while the glycidyl ester toughens the polyphenylene sulfide resin, the olefin segments of the copolymer of olefin and glycidyl ester also connect to the molecular chains of the polyphenylene sulfide resin. Due to the good flexibility of the olefin, the olefin and glycidyl ester act synergistically on the polyphenylene sulfide resin, further improving the flexibility of the polyphenylene sulfide composition. The harmonica pipe material can be analyzed by analyzing its characteristic absorption peaks based on its infrared spectrum. By comparing the characteristic absorption peak data with the infrared spectra of known compounds or standard spectra, the molecular structure and groups of the harmonica pipe material can be determined. For example, by comparing the infrared spectrum of the harmonica pipe material with the infrared spectra of known compounds or standard spectra, it can be determined that the harmonica pipe material includes functional groups such as benzene rings, phenylsulfide bonds, olefins, ester groups, hydroxyl groups, and alkyl groups. Based on the analyzed benzene rings and phenylsulfide bonds, reverse qualitative analysis can be performed to determine that the harmonica pipe material includes polyphenylene sulfide. Based on the analyzed olefins, reverse qualitative analysis can be performed to determine that the harmonica pipe material includes olefins. Based on the analyzed olefins, ester groups, hydroxyl groups, and alkyl groups, reverse qualitative analysis can be performed to determine that the harmonica pipe material includes a copolymer of glycidyl esters.

[0060] In the embodiments of the present application, a polyphenylene sulfide resin is modified by a toughening agent to form a polyphenylene sulfide composition. The polyphenylene sulfide composition is suitable for extrusion molding, which simplifies the processing technology. The harmonica tube formed has good product performance, for example, good dimensional stability, surface accuracy, mechanical properties (such as strength, toughness and elongation at break, etc.), deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, etc., which can meet the product working conditions, reduce the occurrence of extruded material breakage and poor extrusion during the extrusion molding process, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0061] In some embodiments, the polyphenylene sulfide resin has a number average molecular weight greater than or equal to 50,000.

[0062] In any embodiment, the number average molecular weight of the polyphenylene sulfide resin is greater than or equal to 50,000, 60,000, 65,000, 70,000, 75,000, 80,000, 85,000, 90,000, 95,000, or 100,000, or a range consisting of any two of the foregoing values. For example, the number average molecular weight of the polyphenylene sulfide resin may be 50,000-80,000, 70,000-90,000, or 90,000-100,000. Within the foregoing ranges, a larger number average molecular weight of the polyphenylene sulfide resin is beneficial for improving its rigidity, thereby imparting to the harmonica tube excellent mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance. A smaller number average molecular weight of the polyphenylene sulfide resin is beneficial for improving its processing performance, thereby reducing the difficulty of extrusion processing with a toughening agent.

[0063] The polyphenylene sulfide resin of the embodiment of the present application has a number average molecular weight greater than or equal to 50,000, and its viscosity is relatively high, which facilitates the extrusion processing and molding of the harmonica tube. In addition, the polyphenylene sulfide resin with a number average molecular weight greater than or equal to 50,000 has high rigidity, which is beneficial for the formed harmonica tube to have good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance.

[0064] In some embodiments, the number average molecular weight of the polyphenylene sulfide resin is 50,000 to 10,000.

[0065] The number average molecular weight of the polyphenylene sulfide resin in the embodiment of the present application satisfies 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 and creep resistance.

[0066] In some embodiments, the polyphenylene sulfide composition comprises 80 to 90 parts by weight of polyphenylene sulfide resin and 10 to 20 parts by weight of toughening agent.

[0067] In any embodiment, the polyphenylene sulfide resin may be 80 parts by weight, 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight, 85 parts by weight, 86 parts by weight, 87 parts by weight, 88 parts by weight, 89 parts by weight, or 90 parts by weight, or a range consisting of any two of the above values. For example, the polyphenylene sulfide resin may be 80 parts by weight to 85 parts by weight, 83 parts by weight to 88 parts by weight, or 85 parts by weight to 90 parts by weight. Within the above ranges, a lower amount of polyphenylene sulfide resin is beneficial for improving the toughness of the formed harmonica tube and reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process. A higher amount of polyphenylene sulfide resin is beneficial for improving the rigidity of the formed harmonica tube and enhancing the dimensional stability of the harmonica tube. In any embodiment, the raw material can contain 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, or 20 parts by weight, or a range consisting of any two of the above values. For example, the raw material can contain 10 to 15 parts by weight, 12 to 18 parts by weight, or 15 to 20 parts by weight. Within the above range, a higher amount of toughening agent is beneficial to improving the toughness of the harmonica tube and reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process. A lower amount of toughening agent is beneficial to improving the rigidity of the harmonica tube and improving the dimensional stability of the formed harmonica tube.

[0068] 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.

[0069] Melt flow index (MFI) is a numerical value that indicates the fluidity of a plastic material during processing. It was developed by the American Standards Association for Measurement and Testing (ASTM) based on a method used by DuPont to identify plastic properties. The test method involves melting plastic pellets into a liquid. The amount of liquid flowing through a 2.1mm diameter tube is then measured in grams over a specified time (10 minutes) at a specific temperature and pressure (different standards apply to different materials). A higher value indicates better processing fluidity, and vice versa.

[0070] In any embodiment, the melt index of the polyphenylene sulfide resin at 316°C / 10kg may satisfy 55 g / 10min, 60 g / 10min, 65 g / 10min, 70 g / 10min, 75 g / 10min, 80 g / 10min, 85 g / 10min, 90 g / 10min, 95 g / 10min, 100 g / 10min, 105 g / 10min, 110 g / 10min, 115 g / 10min, 120 g / 10min, 125 g / 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 may satisfy 55 g / 10min-100 g / 10min, 80 g / 10min-110 g / 10min, or 100 g / 10min-125 g / 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 during the extrusion molding process. A smaller melt index is beneficial to improving the rigidity of the polyphenylene sulfide resin and increasing the mechanical strength and dimensional stability of the harmonica tube formed.

[0071] 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).

[0072] In the embodiments of the present application, the provided copolymer of olefin and glycidyl ester is used to improve the toughness of the polyphenylene sulfide composition, thereby reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process.

[0073] 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.

[0074] In any embodiment, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K may satisfy 4 g / 10min, 4.5 g / 10min, 5 g / 10min, 5.5 g / 10min, 6 g / 10min, 6.5 g / 10min, 7 g / 10min, 7.5 g / 10min, 8 g / 10min, 8.5 g / 10min, 9 g / 10min, 9.5 g / 10min, or 10 g / 10min, or a range consisting of any two of the foregoing values. For example, the melt index of the copolymer of olefin and glycidyl ester at 190°C / 2.16K may satisfy 4 g / 10min to 6 g / 10min, 6 g / 10min to 8 g / 10min, or 8 g / 10min to 10 g / 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 ability to toughen polyphenylene sulfide resin and reducing the occurrence of extrudate breakage and poor extrusion during the extrusion molding process.

[0075] In some embodiments, the polyphenylene sulfide composition further includes an antioxidant.

[0076] 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.

[0077] In the embodiments of the present application, antioxidants are added to delay the aging of the harmonica tube and increase the service life of the harmonica tube.

[0078] In some embodiments, the polyphenylene sulfide composition further comprises less than or equal to 0.5 parts by weight of an antioxidant.

[0079] In any embodiment, the polyphenylene sulfide composition may further include, by weight, 0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, or 0.50 parts by weight of an antioxidant, or a range consisting of any two of the foregoing values. For example, the polyphenylene sulfide composition may further include, by weight, 0 to 0.20, 0.20 to 0.50, or 0.30 to 0.45 parts by weight of an antioxidant. Within the above ranges, a smaller amount of antioxidant is beneficial for improving the uniformity of the antioxidant distribution in the polyphenylene sulfide resin, reducing the raw material cost of the antioxidant, and reducing resource loss and environmental pollution caused by the use of the antioxidant. A larger amount of antioxidant is beneficial for delaying the aging process of the harmonica tube and increasing the service life of the harmonica tube.

[0080] In some embodiments, the polyphenylene sulfide composition further comprises 0.2 to 0.5 parts by weight of an antioxidant.

[0081] The embodiments of the present application are within the above-mentioned range of weight parts 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.

[0082] In some embodiments, the antioxidant includes one or both of N,N′-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine and tris[2,4-di-tert-butylphenyl]phosphite.

[0083] Among them, N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine refers to antioxidant 1098, whose CAS number (Chemical Abstracts Service) is 23128-74-7. Tris[2,4-di-tert-butylphenyl]phosphite refers to antioxidant 168, whose CAS number is 31570-04-4.

[0084] The antioxidant may include only N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, only tris[2,4-di-tert-butylphenyl]phosphite, or both. In some embodiments, 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 may be 0-1:0-1. In some embodiments, 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 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).

[0085] In a second aspect, an embodiment of the present application provides a method for preparing a harmonica tube, comprising:

[0086] Provided is a preparation method for a polyphenylene sulfide composition;

[0087] The polyphenylene sulfide composition is molded to obtain a harmonica tube;

[0088] The polyphenylene sulfide composition comprises polyphenylene sulfide resin and a toughening agent; the toughening agent comprises a copolymer of olefin and glycidyl ester.

[0089] In the embodiments of the present application, the harmonica tube made of a polyphenylene sulfide composition has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation, and creep resistance, which is beneficial to reducing the risk of cracking due to extrusion during use and improving production capacity and product quality.

[0090] In some embodiments, the step of molding the polyphenylene sulfide composition includes:

[0091] The polyphenylene sulfide composition is added into a twin-screw extruder for extrusion molding.

[0092] In some embodiments, a polyphenylene sulfide resin and a toughening agent are mixed to form a premix; the premix is ​​then added to a twin-screw extruder for extrusion molding. The polyphenylene sulfide resin and toughening agent can be added through different feed ports and fed into the screws to form the premix. In some embodiments, the extrusion molding process parameters are set and adjusted accordingly based on the properties of the polyphenylene sulfide resin and toughening agent.

[0093] The embodiment of the present application is to prepare the harmonica tube through an extrusion molding process, which has the advantages of continuous production and high efficiency.

[0094] In some embodiments, the ratio of the length to the diameter of the screws of the twin-screw extruder is 40, 48, or 64.

[0095] In some embodiments, the screw of the twin-screw extruder is provided with two or more shear block areas and one reverse thread area, so that the material pile is denser and the injection molding appearance is better.

[0096] 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.

[0097] In some embodiments, the external cooling water temperature of the twin-screw extruder is between 40°C and 60°C.

[0098] In some embodiments, the screw speed of the twin-screw extruder is 300 rpm to 500 rpm. In any embodiment, the screw speed of the twin-screw extruder can be 300 rpm, 350 rpm, 400 rpm, 450 rpm, 500 rpm, or a range consisting of any two of the above values. For example, the screw speed of the twin-screw extruder can be 300 rpm to 400 rpm, 350 rpm to 450 rpm, or 400 rpm to 500 rpm. In the embodiments of the present application, by regulating the screw speed of the twin-screw extruder, it is beneficial to make the extrusion condition of the polyphenylene sulfide resin and the toughening agent good.

[0099] 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℃.

[0100] In the embodiments of the present application, by setting the above-mentioned extrusion molding process parameters, it is less likely that the extruded material will break or the extrusion will be poor during the formation of the harmonica tube. The harmonica tube formed has good mechanical strength, deformation resistance, corrosion resistance, heat resistance, heat dissipation and creep resistance, etc., which reduces the risk of cracking due to extrusion during use and improves production capacity and product quality.

[0101] In a third aspect, an embodiment of the present application provides a liquid cooling plate, which includes any harmonica tube provided in the first aspect or a harmonica tube produced by the preparation method provided in the second aspect.

[0102] Among them, the liquid cooling plate is used to discharge the heat generated by the battery cells in high temperature or fast charging environments, 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.

[0103] 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., reducing the risk of cracking when squeezed during use, and improving production capacity and product quality.

[0104] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can 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 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. 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.

[0105] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also 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.

[0106] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the exploded structure of a battery provided in some embodiments of the present application, and Figure 3 is a schematic diagram of the structure of a liquid cooling assembly provided in some embodiments of the present application. A battery 100 includes any liquid cooling plate 30 provided in the embodiments of the present application and at least two oppositely disposed battery cells 20, with the liquid cooling plate 30 positioned between two adjacent battery cells 20. The liquid cooling plate 30 includes any harmonica tube provided in the first aspect or a harmonica tube produced 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, in which the battery cells 20 are housed. The housing 10 is configured to provide a storage space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cells 20. The second portion 12 can be a hollow structure with one end open, and the first portion 11 can be a plate-like structure. The first portion 11 covers the open side of the second portion 12, so that the first portion 11 and the second portion 12 jointly define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the box 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a rectangular parallelepiped, etc. In the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are connected in both series and in parallel.

[0107] Multiple battery cells 20 can be directly connected in series, parallel, or hybrid, and then the entire structure formed by the multiple battery cells 20 can be housed in the housing 10. Of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, parallel, or hybrid, and then the multiple battery modules are connected in series, parallel, or hybrid to form a whole structure and housed in the housing 10. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for achieving electrical connection between the multiple 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 to these. The battery cell 20 can be cylindrical, flat, rectangular, or other shapes.

[0108] Please refer to Figure 4, which is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. A battery cell 20 refers to the smallest unit that makes up a battery. As shown in Figure 4, the battery cell 20 includes an end cap 21, a housing 22, a cell assembly 23, and other functional components. The end cap 21 refers to a component that covers the opening of the housing 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 housing 22 to match the housing 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is less likely to deform when squeezed or collided, allowing the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminals 21a can be used to electrically connect to the cell assembly 23 to output or input electrical energy from the battery cell 20. In some embodiments, the end cap 21 may 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 value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap 21, and the insulating member may 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 may 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 may be independent components, and an opening may be provided on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21. 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. When the interior of the shell 22 needs to be encapsulated, the end cap 21 is then covered with 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 material of the shell 22 can be various, 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 the component in the battery cell 100 where the electrochemical reaction occurs. One or more battery cell assemblies 23 can be contained 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 separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet containing active materials constitute the main body of the battery cell assembly, and the portions of the positive electrode sheet and the negative electrode sheet not containing active materials each constitute an electrode tab 23 a .The positive and negative electrode tabs can be located at one end of the main body or at both ends of the main body. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals to form a current loop.

[0109] The beneficial effects of the present application are further illustrated below with reference to the examples.

[0110] 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 drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its applications. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0111] The raw materials used in the following examples and comparative examples were all purchased from the market unless otherwise specified.

[0112] 1. Prepare the harmonica tube:

[0113] Example 1

[0114] 9.5 kg of commercially available polyphenylene sulfide resin (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. 0.5 kg of commercially available ethylene-glycidyl methacrylate (with a melt index of 7 g / 10 min at 190°C / 2.16 kg) was added to the screws through a side feed port. Melt extrusion was performed to obtain a polyphenylene sulfide composition for a harmonica tube. The polyphenylene sulfide composition was then molded to obtain a harmonica tube. The molding process was melt extrusion, with the following process parameters: Zone 1 temperature setting: 110°C, Zone 2 temperature setting: 285°C, Zone 3 temperature setting: 300°C, Zone 4 temperature setting: 305°C, Zone 5 temperature setting: 295°C, Zone 6 temperature setting: 295°C, Zone 7 temperature setting: 300°C, Zone 8 temperature setting: 300°C, Zone 9 temperature setting: 300°C, Die head temperature setting: 310°C, and screw speed: 400 rpm. The twin-screw extruder had a screw length-to-diameter ratio (L / D) of 48. The screw was equipped with two shear block sections and one reverse-thread section. The screw's bonding block angle was 90° + 45°. It should be understood that the combined mass of the polyphenylene sulfide resin and ethylene-glycidyl methacrylate in this example is 10 kg, with 0.1 kg representing 1 part by weight. Specific target ingredients for each example and comparative example are detailed in Table 1.

[0115] Examples 2 to 7 are similar to Example 1, except that the mass ratio of polyphenylene sulfide resin to ethylene-glycidyl methacrylate in these examples is different from that in Example 1. It should be noted that the sum of the masses of polyphenylene sulfide resin and ethylene-glycidyl methacrylate in Examples 2 to 7 is the same as the sum of the masses of polyphenylene sulfide resin and ethylene-glycidyl methacrylate in Example 1.

[0116] Examples 8 to 13 are similar to Example 4, except that the number average molecular weight and the melt index at 316° C. / 10 kg of the polyphenylene sulfide resin in the examples are different from those in Example 4.

[0117] 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 of Example 4 at 190° C. / 2.16 kg.

[0118] 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).

[0119] 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 its molecular formula is C 42 H 63 O3P.

[0120] 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.

[0121] 2. Test of number average molecular weight of polyphenylene sulfide resin:

[0122] The number-average molecular weight of polyphenylene sulfide resin is determined using an osmometer consisting of a measuring cell, a semipermeable membrane, and an osmotic pressure transducer. The measuring cell is divided into two halves by a semipermeable membrane: the upper half is open to the outside world and contains the solution to be measured; the lower half is filled with solvent and isolated from the outside world. The solvent exerts a negative osmotic pressure corresponding to the osmotic concentration of the sample solution. A stainless steel diaphragm installed in the lower half of the measuring cell slightly bends due to the negative osmotic pressure. This bending motion is recorded by a pressure regulation system and converted into an electrical signal. The magnitude of this signal is quantitatively related to the osmotic pressure of the solution. Three or more test solutions of varying concentrations are injected into the upper portion of the measuring cell. The value π of the solvent column corresponding to the osmotic pressure of each solution is obtained by dividing the measured π value by the concentration C, and plotting π / C against C to calculate the number-average molecular weight of the polyphenylene sulfide resin.

[0123] 3. Sample testing:

[0124] The harmonica tubes prepared in each embodiment were made into splines with a length of 150 mm, an end width of 20 mm, and a thickness of 4 mm. The tensile strength and elongation at break of the splines were tested according to ISO 527-2:2012 "Plastic Tensile Test", the flexural strength and flexural modulus of the splines were tested according to ISO 178:2019 "Test of Flexural Properties of Plastics", the cantilever beam notched impact strength of the splines was tested according to ISO 180 "Determination of Impact Strength of Plastics", and the standard test method for determining the thermal conductivity of plastics using transient line source technology according to ASTM D5930-17 was used. The sample was pre-dried at 75°C for 4 hours, and then the sample was placed in a test environment with a constant initial temperature, and a line source was 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 spline is calculated based on the relationship between the temperature increase variable and the polymer temperature transient. The test process of other embodiments is the same as above.

[0125] Table 1 Sample parameters and performance test results of various embodiments and comparative examples

[0126] 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 unit is g / 10min.

[0127] The results show that the elongation at break and the notched cantilever beam impact strength of the comparative example 1 without the addition of the toughening agent are low, and the extrudate is prone to breakage and poor extrusion during the extrusion molding process, and the product is prone to cracking when squeezed during use; relative to the comparative example 1, the elongation at break and the notched cantilever beam impact strength of the harmonica tube material of Example 4 are significantly improved, and the tensile strength, flexural strength, flexural modulus and thermal conductivity still have high values, which is beneficial to reducing the occurrence of breakage and poor extrusion during the extrusion molding process, reducing the risk of cracking when squeezed during use, and improving production capacity and product quality.

[0128] 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 notched cantilever beam 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 regulating the mass ratio of the polyphenylene sulfide resin to the toughening agent, the occurrence of extrudate breakage and poor extrusion during the extrusion molding process 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.

[0129] 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 and the notched cantilever 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 greatly reduce the occurrence of extrudate breakage and poor extrusion during the extrusion molding process, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0130] 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 Izod notched impact strength, tensile strength, flexural strength, flexural modulus and thermal conductivity of the harmonica tube material all fluctuate to a certain extent. Therefore, regulating the melt index of the toughening agent can greatly reduce the occurrence of extrudate breakage and poor extrusion during the extrusion molding process, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0131] 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 addition ratio can greatly reduce the occurrence of extrudate breakage and poor extrusion during the extrusion molding process, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0132] From Examples 4, 22 to 24, it can be seen that when other copolymers of olefins and glycidyl esters are used, the elongation at break and the notched cantilever 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 copolymer of olefins and glycidyl esters can greatly reduce the occurrence of extrudate breakage and poor extrusion during the extrusion molding process, reduce the risk of cracking during extrusion during use, and improve production capacity and product quality.

[0133] In the several embodiments provided in this 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 merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as 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 interface, device or unit, which can be electrical, mechanical or other forms.

[0134] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0135] 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 description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A harmonica pipe, wherein: 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, wherein: The number average molecular weight of the polyphenylene sulfide resin is greater than or equal to 50,000.

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

4. The harmonica pipe according to any one of claims 1 to 3, wherein 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, wherein 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, wherein 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, wherein The melt index of the copolymer of olefin and glycidyl ester under the condition of 190° C. / 2.16 kg satisfies 4 g / 10 min to 10 g / 10 min.

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

9. The harmonica pipe according to claim 8, wherein: The polyphenylene sulfide composition further comprises less than or equal to 0.5 parts by weight of an antioxidant.

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

12. A method for preparing a harmonica tube, wherein: 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 tube according to claim 12, wherein: 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 tube according to claim 13, wherein: 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, wherein: 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, wherein: Comprising the liquid cooling plate of claim 15.

17. An electrical device, wherein: Comprising the battery of claim 16.

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