Screw extruder and battery production system

Abstract

The present application relates to a screw extruder and a battery production system, wherein the screw extruder comprises a barrel, a mandrel and an extrusion conveying assembly, wherein the mandrel is rotatably arranged in the barrel, and the extrusion conveying assembly is fixed on the mandrel; wherein the extrusion conveying assembly comprises a conveying element, a banburying element and a mixing element, wherein the conveying element, the banburying element and the mixing element are all sleeved on the mandrel and arranged side by side along the axis direction of the mandrel, the conveying element is used for conveying materials, the banburying element is used for kneading materials, and the mixing element is used for distributing and mixing materials. In the above-mentioned screw extruder and battery production system, the conveying element, the banburying element and the mixing element are all sleeved on the mandrel and arranged side by side along the axis direction of the mandrel, and the conveying capacity, shearing capacity and mixing capacity of the screw extruder can be adjusted by changing the number and position of the conveying element, the banburying element and the mixing element, so as to optimize the extrusion effect of high-solid content slurry and obtain better slurry extrusion quality.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a screw extruder and a battery production system. Background Art

[0002] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance, etc. of new energy vehicles are increasingly attracting people's attention and attention.

[0003] In the processing technology of lithium batteries, after the high-solid content slurry is extruded through a screw extruder, the subsequent processing steps are carried out. The extruded material has a high viscosity and a certain mechanical strength to meet the needs of the subsequent processes. The existing screw extruder has a high shearing effect, which will cause the mechanical properties of the material to decrease during the twin-screw extrusion process. The extrusion effect and extrusion quality of the high-solid content slurry cannot meet the use requirements, which will cause the subsequent processing steps to be unable to be completed or the completion effect to be poor. Utility Model Content

[0004] Based on this, it is necessary to provide a screw extruder and a battery production system to address the problem that the extrusion effect and extrusion quality of high-solid content slurry cannot meet the use requirements.

[0005] A screw extruder includes a barrel, a core shaft and an extrusion conveying assembly, wherein the core shaft is rotatably arranged in the barrel, and the extrusion conveying assembly is fixed on the core shaft; wherein the extrusion conveying assembly includes a conveying element, a banburying element and a mixing element, wherein the conveying element, the banburying element and the mixing element are all sleeved on the core shaft and arranged side by side along the axis direction of the core shaft, the conveying element is used for conveying materials, the banburying element is used for kneading materials, and the mixing element is used for distributing and mixing materials. In the above-mentioned screw extruder, the extrusion conveying assembly includes a conveying element, a banburying element and a mixing element, wherein the conveying element, the banburying element and the mixing element are all sleeved on the core shaft and arranged side by side along the axis direction of the core shaft, and the conveying capacity, shearing capacity and mixing capacity of the screw extruder can be adjusted by changing the number and position of the conveying element, the banburying element and the mixing element, so as to optimize the extrusion effect of high-solid content slurry and obtain better slurry extrusion quality.

[0006] In some embodiments, the surface of the conveying element has at least one first thread, and the hand direction of all the first threads is consistent. In this way, the hand direction of all the first threads on the surface of the conveying element is consistent, so as to smoothly convey the material.

[0007] In some embodiments, the conveying element has a first mounting hole for the mandrel to pass through, and the center of the first mounting hole does not coincide with the center of the conveying element. In this way, the conveying element is eccentrically arranged on the mandrel, which is convenient for optimizing the extrusion effect of high-solid content slurry and obtaining better slurry extrusion quality.

[0008] In some embodiments, the surface of the kneading element has a second thread and a third thread, and the second thread and the third thread are sequentially distributed along the axis direction of the core shaft and have opposite rotation directions. In this way, the residence time of the material can be effectively prolonged, so that the kneading effect of the material is better.

[0009] In some embodiments, the number of the second threads is at least two, and the rotation directions of all the second threads are consistent and spaced apart. In this way, the fluctuation range of the extrusion amount can be reduced, which is conducive to optimizing the extrusion effect of the high solid content slurry.

[0010] In some embodiments, the number of the third threads is at least two, and the rotation directions of all the third threads are consistent and spaced apart. In this way, the fluctuation range of the extrusion amount can be reduced, which is conducive to optimizing the extrusion effect of the high solid content slurry.

[0011] In some embodiments, the internal mixing element has a second mounting hole for the mandrel to pass through, and the center of the second mounting hole does not coincide with the center of the internal mixing element. In this way, the internal mixing element is eccentrically arranged on the mandrel, which is convenient for optimizing the extrusion effect of the high solid content slurry and obtaining better slurry extrusion quality.

[0012] In some embodiments, the surface of the mixing element has at least one fourth thread, and the hand direction of all the fourth threads is consistent. In this way, the hand direction of all the fourth threads on the surface of the mixing element is consistent, so as to smoothly convey and mix the materials.

[0013] In some embodiments, each fourth thread has a groove, and the groove has a closed end and an open end that are oppositely disposed, and the open end of the groove is connected to the outside. In this way, by forming the groove on the fourth thread of the mixing element, materials in different flow channels can be divided through the groove, thereby enhancing the mixing effect of the materials.

[0014] In some embodiments, at least two grooves are formed on the same fourth thread, and each groove is spaced apart and distributed on the screw ridge of each fourth thread. Thus, each groove is spaced apart and distributed on the screw ridge of each fourth thread, which can further enhance the mixing effect of the materials.

[0015] In some embodiments, the mixing element has a third mounting hole for the mandrel to pass through, and the center of the third mounting hole does not coincide with the center of the mixing element. In this way, the mixing element is eccentrically arranged on the mandrel, which is convenient for optimizing the extrusion effect of high-solid content slurry and obtaining better slurry extrusion quality.

[0016] In some embodiments, the outer wall of the mandrel and / or the inner wall of the barrel are provided with a wear-resistant coating, so as to improve the surface hardness of the mandrel and / or the barrel, reduce the wear caused by the direct contact between the mandrel and / or the barrel and the material, thereby extending the service life of the mandrel and / or the barrel, and improving the quality of the extruded material.

[0017] In some embodiments, the number of mandrels is at least two, each mandrel is spaced apart and arranged side by side, and each mandrel is fixed with at least one extrusion conveying assembly, so that the slurry with high solid content can be mixed more efficiently, thereby obtaining better slurry quality.

[0018] A battery production system includes the above-mentioned screw extruder. In the above-mentioned battery production system, the extrusion and conveying assembly of the screw extruder includes a conveying element, a kneading element and a mixing element. By changing the number and position of the conveying element, the kneading element and the mixing element, the conveying capacity, shearing capacity and mixing capacity of the screw extruder can be adjusted to optimize the extrusion effect of high-solid content slurry and obtain better slurry extrusion quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded view of a battery provided for some embodiments of the present application.

[0020] Figure 2 Schematic diagram of a screw extruder provided for some embodiments of the present application.

[0021] Figure 3 for Figure 2 A partial enlarged view of point A of the screw extruder shown.

[0022] Figure 4 for Figure 1 Schematic diagram of the interior of a screw extruder shown.

[0023] Figure 5 for Figure 1 Schematic diagram of the conveying elements in a screw extruder shown.

[0024] Figure 6 for Figure 1 Schematic diagram of the internal mixing element in the screw extruder shown.

[0025] Figure 7 for Figure 1 Schematic diagram of the mixing elements in a screw extruder shown.

[0026] Reference numerals:

[0027] 20. Battery; 21. Housing; 22. Battery cell; 21a. First part; 21b. Second part; 100. Cylinder; 200. Mandrel; 300. Extrusion conveying assembly; 310. Conveying element; 311. First thread; 312. First mounting hole; 320. Mixing element; 321. Second thread; 322. Third thread; 323. Second mounting hole; 330. Mixing element; 331. Fourth thread; 331a. Groove; 332. Third mounting hole. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application are described in detail in conjunction with 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.

[0029] 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.

[0030] 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 meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0031] 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.

[0032] 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.

[0033] 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 groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance, etc. of new energy vehicles are increasingly attracting people's attention and attention.

[0037] In the processing technology of lithium batteries, after the high-solid content slurry is extruded through a screw extruder, the subsequent processing steps are carried out. The extruded material has a high viscosity and a certain mechanical strength to meet the needs of the subsequent processes. The existing screw extruder has a high shearing effect, which will cause the mechanical properties of the material to decrease during the twin-screw extrusion process. The extrusion effect and extrusion quality of the high-solid content slurry cannot meet the use requirements, which will cause the subsequent processing steps to be unable to be completed or the completion effect to be poor.

[0038] Based on the above considerations, the present application designs a screw extruder and a battery production system. The extrusion and conveying components of the screw extruder include conveying elements, internal kneading elements and mixing elements. The conveying elements, internal kneading elements and mixing elements are all sleeved on the core shaft and distributed side by side along the axial direction of the core shaft. The conveying capacity, shearing capacity and mixing capacity of the screw extruder can be adjusted by changing the number and position of the conveying elements, internal kneading elements and mixing elements to optimize the extrusion effect of high-solid content slurry and obtain better slurry extrusion quality.

[0039] Please refer to Figure 1 , Figure 1An exploded view of a battery 20 provided for some embodiments of the present application. The battery 20 includes a box body 21 and a battery cell 22, and the battery cell 22 is contained in the box body 21. Among them, the box body 21 is used to provide a storage space for the battery cell 22, and the box body 21 can adopt a variety of structures. In some embodiments, the box body 21 may include a first part 21a and a second part 21b, and the first part 21a and the second part 21b cover each other, and the first part 21a and the second part 21b jointly define a storage space for accommodating the battery cell 22. The second part 21b can be a hollow structure with one end open, and the first part 21a can be a plate-like structure, and the first part 21a covers the open side of the second part 21b, so that the first part 21a and the second part 21b jointly define a storage space; the first part 21a and the second part 21b can also be hollow structures with one side open, and the open side of the first part 21a covers the open side of the second part 21b. Of course, the box body 21 formed by the first part 21a and the second part 21b can be in various shapes, such as a cylinder, a cuboid, etc.

[0040] In the battery 20, there can be multiple battery cells 22, and the multiple battery cells 22 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 22 are both connected in series and in parallel. The multiple battery cells 22 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 22 is accommodated in the box 21; of course, the battery 20 can also be a battery module formed by first connecting multiple battery cells 22 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the box 21.

[0041] Each battery cell 22 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 may be cylindrical, flat, rectangular, or in other shapes, and the present application embodiment does not limit this.

[0042] Please refer to Figures 2 to 4 The screw extruder in one embodiment includes a barrel 100, a core shaft 200 and an extrusion conveying assembly 300. The core shaft 200 is rotatably arranged in the barrel 100, and the extrusion conveying assembly 300 is fixed on the core shaft 200. Among them, the extrusion conveying assembly 300 includes a conveying element 310, a kneading element 320 and a mixing element 330. The conveying element 310, the kneading element 320 and the mixing element 330 are all sleeved on the core shaft 200 and distributed side by side along the axis direction of the core shaft 200. The conveying element 310 is used to convey materials, the kneading element 320 is used to knead materials, and the mixing element 330 is used to distribute and mix materials.

[0043] It should be noted that the axial direction of the mandrel 200 is Figure 4The conveying element 310, the kneading element 320 and the mixing element 330 are arranged side by side on the mandrel 200 along the axis direction of the mandrel 200. By driving the mandrel 200 to rotate, the various elements on the mandrel 200 are driven to rotate to realize the conveying, kneading and mixing of the material. Optionally, the material is a high solid content slurry for producing the battery 20, and the high solid content means that the proportion of solid matter contained in the slurry is high.

[0044] In the embodiment of the present application, the barrel 100 is configured as a component for loading materials. The barrel 100 is a hollow barrel, which can be a cylindrical barrel, a prismatic barrel or other irregularly shaped barrel structures.

[0045] In the embodiment of the present application, the mandrel 200 is configured to rotate a component disposed in the barrel 100, and the mandrel 200 can rotate relative to the barrel 100. The mandrel 200 can be cylindrical, prismatic or other columnar structures.

[0046] In the embodiment of the present application, the extrusion conveying assembly 300 is configured as a component fixed on the core shaft 200. The extrusion conveying assembly 300 and the core shaft 200 are detachably connected, for example, each element of the extrusion conveying assembly 300 is sleeved on the core shaft 200. Among them, the conveying element 310 of the extrusion conveying assembly 300 is used to convey materials, the mixing element 320 is used to knead the materials, and the mixing element 330 is used to distribute and mix the materials. The number of each element of the extrusion conveying assembly 300 is not limited to one, and the number and position of each element can be flexibly set as needed to obtain different mixing and dispersing effects on the materials.

[0047] The above-mentioned screw extruder, the extrusion conveying component 300 includes a conveying element 310, a kneading element 320 and a mixing element 330. The conveying element 310, the kneading element 320 and the mixing element 330 are all sleeved on the core shaft 200 and distributed side by side along the axial direction of the core shaft 200. By changing the number and position of the conveying element 310, the kneading element 320 and the mixing element 330, the conveying capacity, shearing capacity and mixing capacity of the screw extruder can be adjusted to optimize the extrusion effect of high-solid content slurry and obtain better slurry extrusion quality.

[0048] According to some embodiments of this application, please refer to Figure 5 The surface of the conveying element 310 has at least one first thread 311, and the rotation direction of all the first threads 311 is consistent.

[0049] In the embodiment of the present application, the conveying element 310 is configured as a component for conveying materials, and the number of the conveying element 310 is not limited to one. When the number of the conveying elements 310 is at least two, the first threads 311 on each conveying element 310 can be set to different sizes or shapes.

[0050] For example, the lead of the first thread 311 of the same conveying element 310 is the same, and the lead of the first thread 311 of different conveying elements 310 is different. By arranging and combining the conveying elements 310, the leads are reduced or increased in sequence to achieve the extrusion and release process of the material. The output can also be increased by setting a conveying element 310 with a larger lead at the entrance.

[0051] Through the above arrangement, the rotation directions of all the first threads 311 on the surface of the conveying element 310 are consistent, so as to smoothly convey the material.

[0052] According to some embodiments of this application, please refer to Figure 5 The conveying element 310 has a first mounting hole 312 for the core shaft 200 to pass through, and the center of the first mounting hole 312 does not coincide with the center of the conveying element 310 .

[0053] In the embodiment of the present application, a keyway is provided in the first mounting hole 312, and a flange is provided on the outer periphery of the mandrel 200. When the conveying element 310 is sleeved on the mandrel 200, the mandrel 200 passes through the first mounting hole 312, and the flange is inserted into the keyway, so that the conveying element 310 is fixed to the mandrel 200 and the disassembly and assembly of the conveying element 310 is facilitated. Optionally, both the keyway and the flange extend along the axial direction of the mandrel 200, and the number of the keyway and the flange is not limited to one, and both the keyway and the flange can be evenly distributed along the circumference of the mandrel 200.

[0054] In an embodiment of the present application, the core shaft 200 is cylindrical, and the first mounting hole 312 is a round hole to match the core shaft 200; alternatively, the core shaft 200 can also be a prism or other irregular shapes, and the first mounting hole 312 can be a square hole or other irregular shapes.

[0055] Through the above arrangement, the conveying element 310 is eccentrically arranged on the core shaft 200, so as to optimize the extrusion effect of the slurry with high solid content and obtain better slurry extrusion quality.

[0056] According to some embodiments of this application, please refer to Figure 5 The distance L1 between the center of the first mounting hole 312 and the center of the conveying element 310 is in the range of 1 mm to 5 mm.

[0057] It should be noted that the distance L1 between the center of the first mounting hole 312 and the center of the conveying element 310 is Figure 5 The spacing in the Y direction is shown. The value of the spacing L1 will affect the conveying and mixing effect of the material. For example, the larger the L1, the greater the change in the cavity formed by the conveying element 310 and the inner wall of the cylinder 100, the more tensile flow is formed, and it is more conducive to the conveying of the material.

[0058] Optionally, a distance L1 between the center of the first mounting hole 312 and the center of the conveying element 310 is 1 mm, 2 mm or 3 mm.

[0059] Through the above arrangement, by limiting the distance between the center of the first mounting hole 312 and the center of the conveying element 310 , it is beneficial to optimize the space occupied by the conveying element 310 on the basis of optimizing the extrusion effect of the high solid content slurry.

[0060] According to some embodiments of this application, please refer to Figure 6 The surface of the kneading element 320 has a second thread 321 and a third thread 322 , and the second thread 321 and the third thread 322 are sequentially distributed along the axial direction of the core shaft 200 and have opposite rotation directions.

[0061] In an embodiment of the present application, the kneading element 320 is configured as a component for kneading materials. The forward thread can transport the material forward, and the reverse thread can hinder the forward transportation of the material. By combining the forward thread and the reverse thread, the residence time of the material is effectively extended, so that the kneading effect of the material is better.

[0062] Optionally, one of the second thread 321 and the third thread 322 is a forward thread, and the other of the second thread 321 and the third thread 322 is a reverse thread. The number of the second thread 321 and the number of the third thread 322 are 1, 2 or 3 respectively.

[0063] Through the above arrangement, the second thread 321 and the third thread 322 are arranged side by side along the axial direction of the core shaft 200 and have opposite rotation directions, which can effectively prolong the residence time of the material and achieve a better kneading effect of the material.

[0064] According to some embodiments of this application, please refer to Figure 6 The number of the second threads 321 is at least two, and the rotation directions of all the second threads 321 are consistent and spaced apart.

[0065] It should be noted that the number of the second threads 321 will affect the feeding frequency. For example, an increase in the number of the second threads 321 will increase the feeding frequency, thereby reducing the output fluctuation of the extruder.

[0066] Through the above arrangement, the fluctuation range of the extrusion amount can be reduced, which is beneficial to optimizing the extrusion effect of the high solid content slurry.

[0067] According to some embodiments of this application, please refer to Figure 6 The number of the third threads 322 is at least two, and the rotation directions of all the third threads 322 are consistent and spaced apart.

[0068] Through the above arrangement, the fluctuation range of the extrusion amount can be reduced, which is beneficial to optimizing the extrusion effect of the high solid content slurry.

[0069] According to some embodiments of this application, please refer to Figure 6 The internal kneading element 320 has a second mounting hole 323 for the core shaft 200 to pass through, and the center of the second mounting hole 323 does not coincide with the center of the internal kneading element 320.

[0070] In the embodiment of the present application, a keyway is provided in the second mounting hole 323, and a flange is provided on the outer periphery of the mandrel 200. When the internal kneading element 320 is sleeved on the mandrel 200, the mandrel 200 passes through the second mounting hole 323, and the flange is inserted into the keyway, so that the internal kneading element 320 is fixed to the mandrel 200 and the assembly and disassembly of the internal kneading element 320 is facilitated. Optionally, both the keyway and the flange extend along the axial direction of the mandrel 200, and the number of the keyway and the flange is not limited to one, and both the keyway and the flange can be evenly distributed along the circumference of the mandrel 200.

[0071] In an embodiment of the present application, the core shaft 200 is cylindrical, and the second mounting hole 323 is a circular hole to match the core shaft 200; alternatively, the core shaft 200 can also be a prism or other irregular shapes, and the second mounting hole 323 can be a square hole or other irregular shapes.

[0072] Through the above arrangement, the internal mixing element 320 is eccentrically arranged on the core shaft 200, so as to optimize the extrusion effect of the slurry with high solid content and obtain better slurry extrusion quality.

[0073] According to some embodiments of this application, please refer to Figure 6 The distance L2 between the center of the second mounting hole 323 and the center of the kneading element 320 ranges from 1 mm to 5 mm.

[0074] It should be noted that the distance L1 between the center of the second mounting hole 323 and the center of the kneading element 320 is Figure 6 The spacing in the Y direction is shown.

[0075] Optionally, the distance L2 between the center of the second mounting hole 323 and the center of the kneading element 320 is 1 mm, 2 mm or 3 mm.

[0076] Through the above arrangement, by limiting the distance between the center of the second mounting hole 323 and the center of the internal mixing element 320, it is beneficial to optimize the space occupied by the internal mixing element 320 on the basis of optimizing the extrusion effect of the high solid content slurry.

[0077] According to some embodiments of this application, please refer to Figure 7 The surface of the mixing element 330 has at least one fourth thread 331 , and the rotation direction of all the fourth threads 331 is consistent.

[0078] In the embodiment of the present application, the mixing element 330 is configured as a component for distributing and mixing materials, and the number of the mixing element 330 is not limited to one. When the number of the mixing element 330 is at least two, the fourth thread 331 on each mixing element 330 can be set to different sizes or shapes.

[0079] For example, the lead of the fourth thread 331 of the same mixing element 330 is the same, and the lead of the fourth thread 331 of different mixing elements 330 is different. By arranging and combining the mixing elements 330, the lead is reduced or increased in sequence to achieve the extrusion and release process of the material.

[0080] Through the above arrangement, the rotation directions of all the fourth threads 331 on the surface of the mixing element 330 are consistent, so as to facilitate smooth conveying and mixing of materials.

[0081] According to some embodiments of this application, please refer to Figure 7 Each fourth thread 331 is provided with a groove 331a, and the groove 331a has a closed end and an open end which are arranged opposite to each other, and the open end of the groove 331a is communicated with the outside.

[0082] In the embodiment of the present application, the groove 331a has a closed end and an open end that are relatively arranged. The groove 331a can be U-shaped, V-shaped, C-shaped or other structural shapes with a closed end and an open end. The shape of the groove 331a is not limited here.

[0083] Through the above arrangement, by providing the groove 331 a on the fourth thread 331 of the mixing element 330 , materials in different flow channels can be diverted through the groove 331 a , thereby enhancing the mixing effect of the materials.

[0084] According to some embodiments of this application, please refer to Figure 7 At least two grooves 331 a are formed on the same fourth thread 331 , and the grooves 331 a are spaced apart and distributed on the screw edges of the fourth threads 331 .

[0085] In the embodiment of the present application, the grooves 331 a on the same fourth thread 331 have the same size and shape to facilitate uniform distribution and mixing of materials.

[0086] Through the above arrangement, the grooves 331 a are distributed at intervals on the screw ridges of the fourth screw threads 331 , which can further enhance the mixing effect of the materials.

[0087] According to some embodiments of this application, please refer to Figure 7 The mixing element 330 has a third mounting hole 332 for the core shaft 200 to pass through, and the center of the third mounting hole 332 does not coincide with the center of the mixing element 330 .

[0088] In the embodiment of the present application, a keyway is provided in the third mounting hole 332, and a flange is provided on the outer periphery of the mandrel 200. When the mixing element 330 is sleeved on the mandrel 200, the mandrel 200 passes through the third mounting hole 332, and the flange is inserted into the keyway, so that the mixing element 330 is fixed to the mandrel 200 and the disassembly and assembly of the mixing element 330 is facilitated. Optionally, the keyway and the flange both extend along the axial direction of the mandrel 200, and the number of the keyway and the flange is not limited to one, and the keyway and the flange can be evenly distributed along the circumference of the mandrel 200.

[0089] In an embodiment of the present application, the core shaft 200 is cylindrical, and the third mounting hole 332 is a circular hole to match the core shaft 200; alternatively, the core shaft 200 can also be a prism or other irregular shapes, and the third mounting hole 332 can be a square hole or other irregular shapes.

[0090] Through the above arrangement, the third mounting hole 332 is opened at a non-central position of the mixing element 330, that is, the mixing element 330 is eccentrically arranged on the core shaft 200, which is convenient for optimizing the extrusion effect of high-solid content slurry and obtaining better slurry extrusion quality.

[0091] According to some embodiments of this application, please refer to Figure 7 The distance L3 between the center of the third mounting hole 332 and the center of the mixing element 330 is in the range of 1 mm to 5 mm.

[0092] It should be noted that the distance L1 between the center of the third mounting hole 332 and the center of the mixing element 330 is Figure 7 The spacing in the Y direction is shown.

[0093] Optionally, the distance L2 between the center of the third mounting hole 332 and the center of the mixing element 330 ranges from 1.5 mm to 2.5 mm, and the distance L2 between the center of the third mounting hole 332 and the center of the mixing element 330 is 1 mm, 2 mm or 3 mm.

[0094] Through the above arrangement, by limiting the distance between the center of the third mounting hole 332 and the center of the mixing element 330, it is beneficial to optimize the space occupied by the mixing element 330 on the basis of optimizing the extrusion effect of the high solid content slurry.

[0095] According to some embodiments of this application, please refer to Figure 2 The outer wall of the core shaft 200 and / or the inner wall of the cylinder 100 are provided with an anti-wear coating.

[0096] In the embodiment of the present application, the anti-wear coating may be an anti-friction metal coating.

[0097] Through the above arrangement, the surface hardness of the core shaft 200 and / or the barrel 100 is improved, and the wear caused by the direct contact between the core shaft 200 and / or the barrel 100 and the material is reduced, thereby helping to extend the service life of the core shaft 200 and / or the barrel 100 and improving the quality of the extruded material.

[0098] According to some embodiments of this application, please refer to Figure 2 The number of the mandrels 200 is at least two, the mandrels 200 are spaced apart and arranged side by side, and at least one extrusion conveying assembly 300 is fixed on each mandrel 200 .

[0099] In the embodiment of the present application, each mandrel 200 can be moved along Figure 2 As shown, they are arranged side by side and spaced apart in the Y direction, and at least one extrusion conveying assembly 300 is fixed on each of the core shafts 200 .

[0100] Through the above arrangement, slurry with high solid content can be mixed more efficiently, thereby obtaining better slurry quality.

[0101] According to some embodiments of this application, please refer to Figure 2 , a battery production system in one embodiment includes the above-mentioned screw extruder.

[0102] It should be noted that, in addition to the above-mentioned screw extruder, the battery production system also includes a formation mechanism, an assembly mechanism and other types of mechanisms to realize the processing of the battery 20 .

[0103] In the above-mentioned battery production system, the extrusion conveying assembly 300 of the screw extruder includes a conveying element 310, a kneading element 320 and a mixing element 330. By changing the number and position of the conveying element 310, the kneading element 320 and the mixing element 330, the conveying capacity, shearing capacity and mixing capacity of the screw extruder can be adjusted to optimize the extrusion effect of the high-solid content slurry and obtain better slurry extrusion quality.

[0104] According to some embodiments of the present application, see Figures 2 to 7The screw extruder in one embodiment includes a barrel 100, a core shaft 200 and an extrusion conveying assembly 300. The core shaft 200 is rotatably arranged in the barrel 100. The outer wall of the core shaft 200 and the inner wall of the barrel 100 are provided with an anti-wear coating. The extrusion conveying assembly 300 is fixed on the core shaft 200. The extrusion conveying assembly 300 includes a conveying element 310, a kneading element 320 and a mixing element 330. The conveying element 310, the kneading element 320 and the mixing element 330 are arranged side by side on the core shaft 200 along the axial direction of the core shaft 200. The surface of the conveying element 310 has at least one first thread 311, and the rotation direction of all the first threads 311 is consistent; the surface of the kneading element 320 has a second thread 321 and a third thread 322, the second thread 321 and the third thread 322 are arranged side by side along the axial direction of the core shaft 200 and the rotation directions of the two are opposite; the surface of the mixing element 330 has at least one fourth thread 331, and the rotation direction of all the fourth threads 331 is consistent, each fourth thread 331 is respectively provided with a groove 331a, the groove 331a has a closed end and an open end arranged oppositely, and the open end of the groove 331a is connected to the outside.

[0105] Among them, the conveying element 310 has a first mounting hole 312 for the core shaft 200 to pass through, and the first mounting hole 312 is opened at a non-center position of the conveying element 310; the kneading element 320 has a second mounting hole 323 for the core shaft 200 to pass through, and the second mounting hole 323 is opened at a non-center position of the kneading element 320; the mixing element 330 has a third mounting hole 332 for the core shaft 200 to pass through, and the third mounting hole 332 is opened at a non-center position of the mixing element 330.

[0106] According to some embodiments of the present application, see Figure 2 , a battery production system in one embodiment includes the above-mentioned screw extruder.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A screw extruder, characterized in that: include: Cylinder (100); A core shaft (200) rotatably disposed in the cylinder (100); An extrusion conveying assembly (300) fixed on the mandrel (200); The extrusion conveying assembly (300) comprises a conveying element (310), a kneading element (320) and a mixing element (330); the conveying element (310), the kneading element (320) and the mixing element (330) are all sleeved on the core shaft (200) and arranged side by side along the axis direction of the core shaft (200); the conveying element (310) is used for conveying materials, the kneading element (320) is used for kneading the materials, and the mixing element (330) is used for distributing and mixing the materials.

2. The screw extruder according to claim 1, characterized in that The surface of the conveying element (310) has at least one first thread (311), and the rotation direction of all the first threads (311) is consistent.

3. The screw extruder according to claim 1, characterized in that The conveying element (310) has a first mounting hole (312) for the core shaft (200) to pass through, and the center of the first mounting hole (312) does not coincide with the center of the conveying element (310).

4. The screw extruder according to claim 1, characterized in that The surface of the mixing element (320) has a second thread (321) and a third thread (322), and the second thread (321) and the third thread (322) are distributed in sequence along the axial direction of the core shaft (200) and have opposite rotation directions.

5. The screw extruder according to claim 4, characterized in that The number of the second threads (321) is at least two, and the rotation directions of all the second threads (321) are consistent and are distributed at intervals.

6. The screw extruder according to claim 4, characterized in that The number of the third threads (322) is at least two, and the rotation directions of all the third threads (322) are consistent and are distributed at intervals.

7. The screw extruder according to claim 1, characterized in that The internal kneading element (320) has a second mounting hole (323) for the core shaft (200) to pass through, and the center of the second mounting hole (323) does not coincide with the center of the internal kneading element (320).

8. The screw extruder according to claim 1, characterized in that The surface of the mixing element (330) has at least one fourth thread (331), and the rotation direction of all the fourth threads (331) is consistent.

9. The screw extruder according to claim 8, characterized in that Each of the fourth threads (331) is provided with a groove (331a), wherein the groove (331a) has a closed end and an open end which are arranged opposite to each other, and the open end of the groove (331a) is communicated with the outside.

10. The screw extruder according to claim 9, characterized in that At least two grooves (331a) are provided on the same fourth thread (331), and the grooves (331a) are distributed at intervals on the screw edges of the fourth threads (331).

11. The screw extruder according to claim 1, characterized in that The mixing element (330) has a third mounting hole (332) for the core shaft (200) to pass through, and the center of the third mounting hole (332) does not coincide with the center of the mixing element (330).

12. The screw extruder according to claim 1, characterized in that The outer wall of the core shaft (200) and / or the inner wall of the cylinder (100) are provided with an anti-wear coating.

13. The screw extruder according to claim 1, characterized in that The number of the core shafts (200) is at least two, the core shafts (200) are spaced apart and arranged side by side, and at least one extrusion conveying assembly (300) is fixed on each of the core shafts (200).

14. A battery production system, characterized in that: Comprising a screw extruder as described in any one of claims 1-13.

Images