Material pulverizing device and battery production system

Abstract

The application provides a material crushing device and a battery production system. The material crushing device comprises a feeding mechanism and a crushing assembly. The crushing assembly is connected to the feeding mechanism. The crushing assembly comprises a plurality of air flow mills connected in series. The air flow mill comprises a crushed material bin, a sorting bin, a collected material bin and a grading wheel. The sorting bin is connected to the upper side of the crushed material bin. The collected material bin is connected to the lower side of the crushed material bin. The grading wheel is arranged in the sorting bin. Along the flow direction of the material in the plurality of air flow mills, the particle size of the material selected by the grading wheels in the plurality of air flow mills decreases in turn. The material to be crushed driven by high-speed airflow entering from the feeding mechanism can pass through the plurality of air flow mills in turn. Under the action of the grading wheels of the plurality of air flow mills, the crushed material can be selected into a plurality of levels with gradually decreasing particle sizes. The material crushing device can obtain a plurality of levels of material with different particle sizes, which can meet the demand for different levels of material with different particle sizes.

Description

Technical Field

[0001] This application relates to the field of battery production technology, and in particular to a material crushing device and a battery production system. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As people place increasingly higher demands on the quality of battery devices, the quality requirements for the materials used in the battery device manufacturing process are also rising. How to improve the quality of the materials used is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a material crushing device and a battery production system. The material crushing device can divide the material into multiple grades according to the particle size, which is beneficial to improving the quality of the prepared material.

[0005] In a first aspect, some embodiments of this application provide a material crushing device, which includes a feeding mechanism and a crushing assembly. The feeding mechanism includes an air blowing pipe and a feeding pipe that are interconnected. The crushing assembly is connected to the feeding mechanism and includes a plurality of air jet mills connected in series. The air jet mill includes a crushing bin, a sorting bin, a receiving bin, and a classifying wheel. The sorting bin is connected to the upper side of the crushing bin, the receiving bin is connected to the lower side of the crushing bin, and the classifying wheel is disposed in the sorting bin. Along the flow direction of the material in the plurality of air jet mills, the particle size of the material sorted by the classifying wheel in the plurality of air jet mills decreases sequentially.

[0006] In the above structure, the material to be crushed, driven by a high-speed airflow, enters from the feeding mechanism and passes through multiple air jet mills in sequence. This not only makes it easy to obtain materials with smaller particle sizes, but also, because the particle size of the material is separated by the classifying wheels in the multiple air jet mills in sequence along the flow direction of the material, the crushed material can be sorted into multiple grades with progressively smaller particle sizes under the action of the classifying wheels in the multiple air jet mills. This allows the material crushing device to obtain materials with multiple particle size grades, which not only meets the needs for materials with different particle size grades, but also makes the particle size distribution in each grade of material relatively concentrated, which is beneficial to improving the quality of the prepared material.

[0007] According to some embodiments of the present application, the material crushing device includes a liner in the crushing bin. The liner is detachably connected to the inner wall of the crushing bin, which makes it easy to remove the liner from the inner wall of the crushing bin, making maintenance and operation convenient, reducing equipment downtime, and improving production continuity.

[0008] According to some embodiments of the material crushing apparatus provided in this application, the Vickers hardness of the liner is greater than or equal to 1000; the Vickers hardness of the classifying wheel is greater than or equal to 1000, which makes the liner and classifying wheel less prone to wear, which helps to extend the service life of the liner and classifying wheel and reduce the frequency of equipment maintenance.

[0009] According to some embodiments of the material crushing apparatus provided in this application, a guide plate is provided on the inner wall surface of the crushing bin, and the guide plate extends along the axial direction of the crushing bin. By providing a guide plate on the inner wall surface of the crushing bin, the high-speed airflow carrying the material can generate strong turbulence and vortices. The material is fully dispersed and accelerated in the turbulence and vortices, which greatly increases the probability of collision between material particles and between the material and the airflow, thereby improving the crushing efficiency.

[0010] According to some embodiments of the present application, the material crushing device has a guide plate that is inclined along the rotation direction of the material in the crushing bin. The included angle between the guide plate and the radial direction of the crushing bin is set to D, where 5°≤D≤10°. This not only reduces the resistance encountered by the high-speed airflow carrying the material in the crushing bin, thereby reducing the energy consumption of the material crushing device, but also enables the high-speed airflow carrying the material to generate strong turbulence and vortex, thereby improving the crushing efficiency of the material.

[0011] According to some embodiments of this application, the material crushing apparatus further includes a dispersing mechanism. The dispersing mechanism includes an airflow nozzle, which is disposed in the crushing bin and is used to introduce airflow into the crushing bin. The airflow can form a uniform dispersing airflow field around the classifying wheel, so that the material particles are fully dispersed and the possibility of material particle agglomeration is reduced.

[0012] According to some embodiments of the present application, the material crushing device has multiple airflow nozzles, which are spaced apart circumferentially along the crushing bin, so that the multiple airflow nozzles can blow dispersing airflow into the crushing bin, thereby allowing the material in the crushing bin to be dispersed more fully.

[0013] According to some embodiments of the present application, the material crushing apparatus and the dispersing mechanism further include a cooling component and an air inlet pipe. The air inlet pipe is connected to the airflow nozzle. The cooling component can cool the airflow passing through the air inlet pipe, so that cooling airflow is introduced into the crushing bin to remove heat in time, which can effectively reduce the changes in material properties and particle agglomeration caused by temperature rise.

[0014] According to some embodiments of the present application, the material crushing apparatus further includes a water tank and a chiller. The chiller is connected to the water tank to cool the cooling medium in the water tank. The air intake pipe passes through the water tank and exchanges heat with the cooling medium, so that the gas in the air intake pipe is cooled.

[0015] According to some embodiments of this application, the material crushing apparatus further includes a dust removal component connected downstream of the crushing component, which treats the airflow containing dusty material so that the airflow can be discharged.

[0016] According to some embodiments of this application, the material crushing apparatus further includes a vacuum pump connected downstream of the dust removal component, so that the airflow from the crushing component can smoothly enter the dust removal component for dust removal, effectively reducing the dispersion of dust.

[0017] According to some embodiments of this application, the material crushing apparatus further includes a material collecting component, which is connected between a dust removal component and the first air jet mill in the material flow direction among a plurality of air jet mills. This facilitates the simplification of the production process of the material crushing apparatus when multiple classifications of material particle size are not required.

[0018] According to some embodiments of this application, the material crushing apparatus includes a cyclone separator and a collection bin. The inlet of the cyclone separator is connected to the sorting bin of the first air jet mill, the outlet of the cyclone separator is connected to the dust removal component, and the collection bin is connected to the outlet of the cyclone separator.

[0019] Secondly, some embodiments of this application also provide a battery production system, which includes a material crushing device provided by any of the foregoing technical solutions, the material crushing device being used to crush the material to be crushed.

[0020] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0021] This application provides a material crushing device, which includes a feeding mechanism and a crushing assembly. The feeding mechanism includes an air blowing pipe and a feeding pipe that are interconnected. The crushing assembly is connected to the feeding mechanism and includes multiple air jet mills connected in series. Each air jet mill includes a crushing bin, a sorting bin, a receiving bin, and a classifying wheel. The sorting bin is connected to the upper side of the crushing bin, the receiving bin is connected to the lower side of the crushing bin, and the classifying wheel is disposed in the sorting bin. Along the flow direction of the material in the multiple air jet mills, the particle size of the material sorted by the classifying wheel in the multiple air jet mills decreases sequentially.

[0022] In the above structure, the material to be crushed, driven by a high-speed airflow, enters from the feeding mechanism and passes through multiple air jet mills in sequence. This not only makes it easy to obtain materials with smaller particle sizes, but also, because the particle size of the material is separated by the classifying wheels in the multiple air jet mills in sequence along the flow direction of the material, the crushed material can be sorted into multiple grades with progressively smaller particle sizes under the action of the classifying wheels in the multiple air jet mills. This allows the material crushing device to obtain materials with multiple particle size grades, which not only meets the needs for materials with different particle size grades, but also makes the particle size distribution in each grade of material relatively concentrated, which is beneficial to improving the quality of the prepared material.

[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0025] Figure 1 This is a schematic diagram of the structure of a material crushing device provided in some embodiments of this application;

[0026] Figure 2 This is a schematic diagram of a portion of the air jet mill in the material crushing apparatus provided in some embodiments of this application.

[0027] In the attached diagram:

[0028] 1. Feeding mechanism;

[0029] 2. Crushing assembly; 21. Air jet mill; 211. Crushing bin; 2111. Baffle plate; 212. Sorting bin; 213. Receiving bin; 214. Grading wheel;

[0030] 3. Dispersion mechanism; 31. Airflow nozzle; 32. Refrigeration assembly; 321. Water tank; 322. Chiller; 33. Air inlet pipe;

[0031] 4. Dust collection components; 41. Baghouse dust collector; 42. Pulse jet dust collector;

[0032] 5. Vacuum pump;

[0033] 6. Material collection assembly; 61. Cyclone separator; 62. Material collection bin. Detailed Implementation

[0034] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0035] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0036] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0037] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0041] Materials used in the production of active materials for battery devices typically require powder form for subsequent processing. These materials are usually obtained by drying an active material solution. Because the dried powder has a small particle size, the particles easily form soft aggregates, requiring further pulverization. In some cases, air jet mills have been used to pulverize the material. However, these mills usually only have a single classifying mechanism, simply separating the material into coarse and fine powders, which cannot meet the needs of materials with various particle sizes. Furthermore, due to the relatively simple structure of the pulverizing zone in an air jet mill, the material cannot reach the required particle size in a single contact with the high-speed airflow during pulverization, resulting in insufficient pulverization. All of these factors are detrimental to improving the quality of the prepared material.

[0042] To improve the quality of the prepared material, this application provides a material crushing device, which includes a feeding mechanism and a crushing assembly. The feeding mechanism includes an air blowing pipe and a feeding pipe that are interconnected. The crushing assembly is connected to the feeding mechanism and includes multiple air jet mills connected in series. Each air jet mill includes a crushing bin, a sorting bin, a receiving bin, and a classifying wheel. The sorting bin is connected to the upper side of the crushing bin, the receiving bin is connected to the lower side of the crushing bin, and the classifying wheel is disposed in the sorting bin. Along the flow direction of the material in the multiple air jet mills, the particle size of the material sorted by the classifying wheel in the multiple air jet mills decreases sequentially.

[0043] In the above structure, the material to be crushed, driven by a high-speed airflow, enters from the feeding mechanism and passes through multiple air jet mills in sequence. This not only makes it easy to obtain materials with smaller particle sizes, but also, because the particle size of the material is separated by the classifying wheels in the multiple air jet mills in sequence along the flow direction of the material, the crushed material can be sorted into multiple grades with progressively smaller particle sizes under the action of the classifying wheels in the multiple air jet mills. This allows the material crushing device to obtain materials with multiple particle size grades, which not only meets the needs for materials with different particle size grades, but also makes the particle size distribution in each grade of material relatively concentrated, which is beneficial to improving the quality of the prepared material.

[0044] The material pulverizing device disclosed in this application can be used, but is not limited to, for pulverizing powdered active material materials for battery devices. It can also be used for pulverizing intermediates such as fuel, soap powder, and inorganic salts, and can also be used for pulverizing other materials to be pulverized, thereby obtaining materials of better quality.

[0045] The material crushing apparatus and battery production system provided in some embodiments of this application will be further described below with reference to the accompanying drawings and specific implementation methods.

[0046] Some embodiments of this application provide a material crushing apparatus, see reference Figure 1 The material crushing device includes a feeding mechanism 1 and a crushing component 2. The feeding mechanism 1 includes an air blowing pipe (not shown in the figure) and a feeding pipe (not shown in the figure) that are connected to each other. The crushing component 2 is connected to the feeding mechanism 1 and includes multiple air jet mills 21 connected in series. The air jet mill 21 includes a crushing bin 211, a sorting bin 212, a receiving bin 213 and a classifying wheel 214. The sorting bin 212 is connected to the upper side of the crushing bin 211, the receiving bin 213 is connected to the lower side of the crushing bin 211, and the classifying wheel 214 is disposed in the sorting bin 212. Along the flow direction of the material in the multiple air jet mills 21, the particle size of the material sorted by the classifying wheel 214 in the multiple air jet mills 21 decreases sequentially.

[0047] The feeding mechanism 1 can be a mechanism for adding the material to be crushed into the crushing component 2. It can smoothly convey the material to be crushed to the crushing bin 211 of the first air jet mill 21 in a series of air jet mills 21 for crushing.

[0048] The blowing pipe can be a pipe structure in the feeding mechanism 1 used to blow in a high-speed airflow. The feeding pipe can be a pipe structure in the feeding mechanism 1 used to add the material to be crushed. By connecting the blowing pipe and the feeding pipe, the material to be crushed can be mixed into the high-speed airflow.

[0049] For example, the feeding mechanism 1 may include a pneumatic conveying pipeline system connected to the feeding pipeline, so that the material to be crushed can be smoothly mixed with the high-speed airflow blown from the air blowing pipeline under the conveying action of the airflow and enter the crushing bin 211.

[0050] High-speed airflow carries the material to be crushed through a Laval nozzle and injects it into the crushing bin 211 at supersonic speed. At the intersection of multiple high-pressure airflows, the material is repeatedly collided, rubbed, and sheared to grind it, thus achieving the crushing of the material to be crushed.

[0051] The crushing component 2 can be one of several devices in the material crushing device used to crush the material to be crushed. By connecting the crushing component 2 to the feeding mechanism 1, the material to be crushed, which is carried by the high-speed airflow in the feeding mechanism 1, can enter the crushing component 2.

[0052] The pulverizing component 2 includes multiple air jet mills 21 connected in series. This means that the pulverizing component 2 comprises multiple air jet mills 21 connected in series. Connecting multiple air jet mills 21 in series can also mean that two or more air jet mills 21 are connected sequentially according to the material processing flow to form a continuous pulverizing and classifying production line. The output of the previous air jet mill 21 (i.e., the pulverized material) serves as the feed for the next air jet mill 21, allowing the material to be pulverized to undergo multiple pulverizing and classifying processes, gradually refining the material to the target particle size.

[0053] The crushing bin 211, the sorting bin 212, and the receiving bin 213 are three bin structures in the air jet mill 21. The crushing bin is used to crush the material to be crushed, the sorting bin 212 is used to sort the material according to its particle size, and the receiving bin 213 is used to collect the material whose particle size exceeds the sorting standard of the air jet mill 21.

[0054] The sorting bin 212 is connected to the upper side of the crushing bin 211, meaning that the sorting bin 212 is located above and connected to the crushing bin 211. The receiving bin 213 is connected to the lower side of the crushing bin 211, meaning that the receiving bin 213 is connected to the lower side of the crushing bin 211 and connected to the crushing bin 211. The grading wheel 214 is disposed in the sorting bin 212, meaning that the grading wheel 214 is located in the sorting bin 212 and can rotate under the drive of the driver to sort the materials entering the sorting bin 212.

[0055] The material to be crushed, carried by the high-speed airflow, enters the crushing bin 211 through the feeding mechanism 1. The crushed material then enters the sorting bin 212 with the rising airflow. Under the action of the centrifugal force generated by the classifying wheel 214 and the centripetal force generated by the airflow in the sorting bin 212, the coarse and fine particles are separated. The finer particles that meet the particle size requirements enter the discharge port through the gaps in the classifying wheel 214 so that they can enter the next airflow mill 21 or the dust removal component 4. The coarser particles that do not meet the particle size requirements are thrown out by the classifying wheel 214 and fall to the receiving bin 213 for subsequent collection or further crushing.

[0056] Along the flow direction of the material in the multiple air jet mills 21, the particle size of the material sorted by the classifying rollers 214 in the multiple air jet mills 21 decreases sequentially. This means that, in the material flow direction, the particle size of the material sorted by the classifying rollers 214 in the next air jet mill 21 is smaller than the particle size of the material sorted by the classifying rollers 214 in the previous air jet mill 21. This not only reduces the interference of larger particle size materials on the subsequent classification process and significantly improves the overall classification efficiency, but also allows the pulverized material to be sorted into multiple grades with progressively smaller particle sizes. This enables the material pulverizing device to obtain materials of multiple particle size grades, meeting the needs for materials of different particle size grades.

[0057] For example, the pulverizing component 2 of the material pulverizing device includes three air jet mills 21 connected in series. The classifying wheel 214 of the first air jet mill 21 is used to remove larger particles, enabling a wide range of particle sizes that can be accurately classified to produce active materials of various particle sizes, thus meeting different needs. The classifying wheel 214 of the second air jet mill 21 can separate materials of medium particle sizes, suitable for active materials of conventional high-performance lithium batteries. The classifying wheel 214 of the third air jet mill 21 can separate lithium battery active materials with extremely small particle sizes, meeting the requirements of high-end batteries for ultrafine particles. This allows the material pulverizing device to simultaneously produce lithium battery active materials of various particle sizes, meeting the precise particle size requirements of different markets such as high-end batteries and conventional high-performance batteries, thereby improving the applicability and market competitiveness of the products.

[0058] For example, along the flow direction of the material in the multiple air jet mills 21, the diameter of the classifying wheel 214 in the first air jet mill 21 is set to 300mm to 500mm, and the rotational speed of the classifying wheel 214 is set to 500rpm to 2000rpm. The large-diameter classifying wheel 214 can generate a large centrifugal force field, quickly separating particles with significantly larger particle sizes. Under the action of centrifugal force, these large particles are quickly thrown towards the edge of the sorting bin 212 and discharged into the receiving bin 213 through a dedicated discharge channel below, thereby avoiding interference from large particles to subsequent processes and significantly improving the overall classification efficiency. The diameter of the classifying wheel 214 in the second air jet mill 21 is set to 150mm to 250mm, and the rotational speed of the classifying wheel 214 is set to 3000rpm to 5000rpm. The blades of the classifying wheel 214 are specially designed with streamlined curved surfaces. This design can effectively reduce air resistance and allow the material to be subjected to a more uniform centrifugal force during the classification process. The sorting chamber 212 of the second air jet mill 21 further screens the material after coarse classification, refining the particle size and providing a more concentrated and suitable material input for the next stage, ensuring that the next stage air jet mill 21 can operate more efficiently. The diameter of the classifying wheel 214 in the third air jet mill 21 is set between 50mm and 100mm, and its rotational speed is set between 8000rpm and 16000rpm. At this speed range, the classifying wheel 214 generates strong centrifugal force, which can accurately classify the material to meet the stringent particle size requirements of battery active materials. Taking lithium iron phosphate cathode material as an example, through the fine screening of the third air jet mill 21, the particle size can be precisely controlled within the range of D50 of 0.5μm to 0.8μm, with an extremely narrow particle size distribution, ensuring a high degree of consistency in material particle size, which is beneficial to improving the various performance characteristics of lithium batteries.

[0059] The blades of the classifying wheel 214 are specially designed with streamlined curved surfaces. This design effectively reduces air resistance, allowing the material to be subjected to a more uniform centrifugal force during the classification process. The sorting chamber 212 of the second air classifier 21 further screens the material after coarse classification, refining the particle size and providing the next stage with a more concentrated and suitable material input, ensuring that the next stage air classifier 21 can operate more efficiently.

[0060] In the above structure, the material to be crushed, driven by the high-speed airflow, enters from the feeding mechanism 1 and passes through multiple airflow mills 21 in sequence. This not only makes it easy to obtain materials with smaller particle sizes, but also, because the particle size of the material is sorted by the classifying wheels 214 in the multiple airflow mills 21 in sequence along the flow direction of the material, the crushed material can be sorted into multiple grades with progressively smaller particle sizes under the action of the classifying wheels 214 in the multiple airflow mills 21. This allows the material crushing device to obtain materials with multiple particle size grades, which not only meets the needs for materials with different particle size grades, but also makes the particle size distribution in each grade of material relatively concentrated, which is beneficial to improving the quality of the prepared material.

[0061] In some embodiments, the shredder 211 includes a liner that is detachably attached to the inner wall of the shredder 211.

[0062] The liner can be a structure set on the inner wall surface of the crushing bin 211, which is used to reduce the direct contact between the material and the wall of the crushing bin 211, and reduce the possibility of wear on the wall of the crushing bin 211.

[0063] The liner is detachably connected to the inner wall of the crushing bin 211. This means that the liner, which is installed on the inner wall of the crushing bin 211, is detachably connected to the inner wall, making it easy to remove the liner. When the liner affects the performance of the material crushing device due to long-term wear, the operator can quickly remove and replace the liner without large-scale disassembly and repair of the entire equipment. This simplifies maintenance, reduces equipment downtime, and improves production continuity.

[0064] For example, the liner can be fixed to the inner wall of the crushing bin 211 by means of special slots or bolts.

[0065] For example, liners can also be detachably attached to easily worn areas such as bends in the airflow channel to facilitate maintenance of these areas.

[0066] In some embodiments, the Vickers hardness of the liner is greater than or equal to 1000; the Vickers hardness of the grading wheel 214 is greater than or equal to 1000.

[0067] By setting the Vickers hardness of the liner to a range greater than or equal to 1000 HV, the liner has high hardness, making it less prone to wear, which helps to extend the service life of the liner and reduce the frequency of equipment maintenance.

[0068] By setting the Vickers hardness of the grading wheel 214 to a range greater than or equal to 1000 HV, the grading wheel 214 has a high hardness, making it less prone to wear, which helps to extend the service life of the grading wheel 214 and reduce the frequency of equipment maintenance.

[0069] For example, the Vickers hardness of the lining and the Vickers hardness of the grading wheel 214 can be obtained by measuring according to the national standard GB / T4340.1—2024. The specific measurement method can be referred to the national standard GB / T4340.1—2024, and will not be elaborated here.

[0070] In some embodiments, the liner and classifying wheel 214 can be made of novel ceramic matrix composite materials or high-strength alloys with specially treated surfaces. Novel ceramic matrix composite materials, such as silicon carbide ceramic matrix composite materials, possess high hardness, high wear resistance (wear rate reduced by more than 80% compared to ordinary metal materials), and chemical stability (virtually no chemical reaction occurs under various acidic and alkaline environments). Using this material in the manufacture of the classifying wheel 214 effectively resists the erosion and wear of the classifying wheel 214 during high-speed rotation, significantly extending its service life and reducing equipment maintenance frequency. Simultaneously, the chemical inertness of the novel ceramic matrix composite material avoids introducing metallic impurities into the material, ensuring the high purity of the active material.

[0071] In some embodiments, reference Figure 2 A guide plate 2111 is provided on the inner wall surface of the crushing bin 211, and the guide plate 2111 extends along the axial direction of the crushing bin 211.

[0072] The deflector 2111 can be a component used to enable a high-speed airflow carrying material to generate strong turbulence and vortex, so that the material is fully dispersed and accelerated in the turbulence and vortex.

[0073] A guide plate 2111 is provided on the inner wall surface of the crushing bin 211. The guide plate 2111 can be installed on the inner wall surface of the bin, protruding from the inner wall surface. By providing the guide plate 2111 on the inner wall surface of the crushing bin 211, the high-speed airflow carrying the material can generate strong turbulence and vortices. The material is fully dispersed and accelerated in the turbulence and vortices, greatly increasing the probability of collisions between material particles and between the material and the airflow, thus improving crushing efficiency. For example, when crushing lithium iron phosphate, compared with the existing airflow mill 21, this material crushing device can increase the output per unit time by more than 30%, and the particle size after crushing is more uniform.

[0074] The guide plate 2111 extends along the axial direction of the crushing bin 211, which means that the length direction of the guide plate 2111 is arranged along the axial direction of the crushing bin 211, so that the guide plate 2111 can act on a larger area in the crushing bin 211.

[0075] In some embodiments, the guide plate 2111 is inclined along the rotation direction of the material in the crushing bin 211, and the included angle between the guide plate 2111 and the radial direction of the crushing bin 211 is set to D, where 5°≤D≤10°.

[0076] The guide plate 2111 is inclined along the rotation direction of the material in the crushing bin 211. This means that the guide plate 2111 does not protrude radially into the crushing bin 211 on its inner wall surface, but rather is inclined relative to the radial direction of the crushing bin 211 along the rotation direction of the material in the crushing bin 211. By inclining the guide plate 2111 along the rotation direction of the material in the crushing bin 211, it is beneficial to reduce the resistance encountered by the high-speed airflow carrying the material in the crushing bin 211, thus helping to reduce the energy consumption of the material crushing device.

[0077] By setting the radial angle D between the guide plate 2111 and the crushing bin 211 to a range of 5°≤D≤10°, not only can the resistance encountered by the high-speed airflow carrying the material in the crushing bin 211 be reduced, thereby reducing the energy consumption of the material crushing device, but the high-speed airflow carrying the material can also generate strong turbulence and vortex, thereby improving the crushing efficiency of the material.

[0078] The radial angle D between the guide vane 2111 and the crushing bin 211 can be set to a range of 5°≤D≤8°. For example, the radial angle D between the guide vane 2111 and the crushing bin 211 can be set to 5°, 6°, 7° or 8°, which can reduce the resistance encountered by the high-speed airflow carrying material in the crushing bin 211 while generating strong turbulence and vortices in the high-speed airflow carrying material.

[0079] In some embodiments, the material crushing device further includes a dispersing mechanism 3, which includes an airflow nozzle 31 disposed in the crushing bin 211 for introducing airflow into the crushing bin 211.

[0080] The dispersion mechanism 3 can be used to perform secondary dispersion of materials in the crushing bin 211. It can effectively overcome the van der Waals forces between material particles, so that the material particles are fully dispersed, reduce the possibility of material particle agglomeration, and help improve the dispersibility and particle size uniformity of the material.

[0081] The airflow nozzle 31 can be a device in the dispersion mechanism 3 used to blow a dispersing airflow into the material in the crushing bin 211, and it is installed in the crushing bin 211 of the air jet mill 21. By installing the airflow nozzle 31 in the crushing bin 211, the airflow nozzle 31 can introduce a high-speed, uniform airflow into the crushing bin 211. The airflow can form a uniform dispersing airflow field around the classifier wheel 214, so that the material particles are fully dispersed and the possibility of material particle agglomeration is reduced.

[0082] In some embodiments, multiple airflow nozzles 31 are provided, and the multiple airflow nozzles 31 are arranged at circumferential intervals along the crushing bin 211.

[0083] By setting multiple airflow nozzles 31 and arranging them at intervals along the circumference of the crushing bin 211, the multiple airflow nozzles 31 can blow dispersing airflow into the crushing bin 211, so that the material in the crushing bin 211 can be dispersed more fully.

[0084] For example, multiple airflow nozzles 31 are arranged at equal intervals along the circumference of the crushing bin 211, so that the airflow blown into the crushing bin 211 by the multiple airflow nozzles 31 is more uniform, which is beneficial to improving the uniformity of material dispersion in the crushing bin 211.

[0085] For example, the airflow nozzle 31 is oriented radially toward the central axis of the crushing bin 211, so that the airflow ejected from the airflow nozzle 31 can impact and disperse the material flowing in the crushing bin 211.

[0086] In some embodiments, the dispersing mechanism 3 further includes a cooling component 32 and an air inlet pipe 33, the air inlet pipe 33 being connected to the airflow nozzle 31, and the cooling component 32 being able to cool the airflow passing through the air inlet pipe 33.

[0087] The intake pipe 33 can be a pipe for supplying high-pressure gas to the airflow nozzle 31, which is connected to the airflow nozzle 31 so that the airflow nozzle 31 can eject high-speed airflow.

[0088] The cooling component 32 may be a component for cooling the airflow passing through the intake duct 33, which is used to reduce the temperature of the gas delivered from the intake duct 33 to the airflow nozzle 31.

[0089] During the crushing process, the friction between the material and the high-speed airflow generates a large amount of heat. This heat not only affects the material properties but may also cause particle agglomeration. The cooling component 32 can cool the airflow passing through the inlet pipe 33, allowing cooling airflow to enter the crushing bin 211. The low-temperature cooling airflow can contact the material in all directions and evenly, promptly removing heat and ensuring that the material temperature remains below its phase transition temperature and performance degradation temperature. This effectively reduces changes in material properties and particle agglomeration caused by temperature increases.

[0090] In some embodiments, the refrigeration assembly 32 further includes a water tank 321 and a chiller 322, the chiller 322 being connected to the water tank 321 to cool the cooling medium in the water tank 321, and the air intake pipe 33 passing through the water tank 321 and exchanging heat with the cooling medium.

[0091] Water tank 321 can refer to a box structure containing cooling medium. Chiller 322 can be a device used to cool the cooling medium in water tank 321. Chiller 322 is connected to water tank 321, allowing the cooling medium in water tank 321 to circulate through chiller 322 and be cooled, thus enabling chiller 322 to cool the cooling medium in water tank 321. For example, a circulation pump is provided in the pipeline connecting chiller 322 and water tank 321 so that the cooling medium can circulate between chiller 322 and water tank 321.

[0092] The intake pipe 33 passes through the water tank 321 and exchanges heat with the cooling medium. This can mean that at least part of the intake pipe 33 is located in the water tank 321 and exchanges heat with the cooling medium in the water tank 321, so that the gas in the intake pipe 33 is cooled.

[0093] In some embodiments, the material crushing device further includes a high-pressure air source, which is connected to the air inlet pipe 33 and the air blowing pipe. The high-pressure air source can introduce high-speed airflow into the feeding mechanism 1 through the air blowing pipe so that the high-speed airflow can carry the material into the crushing component 2.

[0094] The high-pressure air source can supply high-pressure airflow to the airflow nozzle 31 through the air inlet pipe 33 so that the airflow nozzle 31 can spray airflow to crush the material.

[0095] For example, a diaphragm-type high-pressure air pump can be used to provide a high-pressure air source.

[0096] In some embodiments, the material crushing apparatus further includes a dust removal component 4, which is connected downstream of the crushing component 2.

[0097] The dust collection component 4 can remove and collect the dust generated by the crushing component 2 to reduce the dust's impact on the environment. By connecting the dust collection component 4 downstream of the crushing component 2, the airflow containing dusty materials is treated so that the airflow can be discharged.

[0098] For example, the dust removal component 4 includes a bag dust collector 41, which has good dust collection efficiency and can effectively trap material dust particles in the mixture of material and airflow, which is beneficial to further reduce material loss.

[0099] In some embodiments, the dust removal assembly 4 further includes a pulse dust collector 42, which can be installed in the bag dust collector 41, thereby improving the dust removal and collection effect of the dust removal assembly 4.

[0100] In some embodiments, the material crushing device further includes a vacuum pump 5, which is connected downstream of the dust removal assembly 4.

[0101] By connecting the vacuum pump 5 downstream of the dust removal component 4, the airflow from the crushing component 2 can smoothly enter the dust removal component 4 for dust removal, effectively reducing the spread of dust.

[0102] For example, vacuum pump 5 can be configured as a Roots pump.

[0103] In some embodiments, the material crushing apparatus further includes a material collection assembly 6, which is connected between the dust removal assembly 4 and the first air jet mill 21 in the material flow direction among a plurality of air jet mills 21.

[0104] The collecting component 6 can be a component used to collect the material after it has been sorted by the first air jet mill 21. The collecting component 6 is connected between the dust removal component 4 and the first air jet mill 21 in the material flow direction among the multiple air jet mills 21. This means that the collecting component 6 is located between the dust removal component 4 and the first air jet mill 21 in the material flow direction among the multiple air jet mills 21, and the collecting component is connected to the dust removal component 4 and the first air jet mill 21 in the material flow direction among the multiple air jet mills 21. It collects the material passing through the first air jet mill 21 in the material flow direction among the multiple air jet mills 21, which helps to simplify the production process of the material crushing device when it is not necessary to classify the material particle size multiple times.

[0105] In some embodiments, the material collection assembly 6 includes a cyclone separator 61 and a material collection bin 62. The inlet of the cyclone separator 61 is connected to the sorting bin 212 of the first air jet mill 21, the outlet of the cyclone separator 61 is connected to the dust removal assembly 4, and the material collection bin 62 is connected to the outlet of the cyclone separator 61.

[0106] By connecting the feed inlet of the cyclone separator 61 to the sorting chamber 212 of the first air jet mill 21 and connecting the collection bin 62 to the discharge port of the cyclone separator 61, the material and air mixture passing through the sorting chamber 212 of the first air jet mill 21 can enter the cyclone separator 61, allowing the material in the material and air mixture to be separated and retained. This allows the material whose larger particle size is removed by the classifying wheel 214 of the first air jet mill 21 and the material that meets the particle size requirements can be centrally separated by the cyclone separator 61 and collected in the collection bin 62. This is suitable for situations where multiple classifications of material particle size are not required, which helps to simplify the production process of the material crushing device in such cases.

[0107] By connecting the exhaust port of the cyclone separator 61 to the dust collection component 4, the dust collection component 4 can collect the dust mixed in the airflow discharged from the exhaust port of the cyclone separator 61, thereby reducing the impact of dust on the environment.

[0108] Some embodiments of this application also provide a battery production system, which includes a material crushing device provided by any of the foregoing technical solutions. The material crushing device is used to crush the material to be crushed. The material to be crushed by the material crushing device can be the active material of the battery. Since the active material of the battery in powder form crushed by the material crushing device provided by the foregoing technical solutions has high quality, this battery production system is beneficial to improving the quality of the battery.

[0109] Some embodiments of this application provide material crushing apparatuses, such as Figure 1 As shown, the system includes a feeding mechanism 1, a crushing component 2, a dispersing mechanism 3, a dust removal component 4, and a collecting component 6. The crushing component 2 is connected to the feeding mechanism 1 and includes multiple air jet mills 21 connected in series. The collecting component 6 is connected between the dust removal component 4 and the first air jet mill 21 in the material flow direction. Each air jet mill 21 includes a crushing bin 211, a sorting bin 212, a receiving bin 213, and a classifying wheel 214. The sorting bin 212 is connected to the upper side of the crushing bin 211, the receiving bin 213 is connected to the lower side of the crushing bin 211, and the classifying wheel 214 is disposed in the sorting bin 212. Along the material flow direction in the multiple air jet mills 21, the particle size of the material sorted by the classifying wheel 214 in the multiple air jet mills 21 decreases sequentially. A liner is detachably connected to the inner wall of the crushing bin 211, and the air jet nozzle 31 of the dispersing mechanism 3 is disposed in the crushing bin 211 for introducing airflow into the crushing bin 211.

[0110] In the above structure, the material to be crushed, driven by the high-speed airflow, enters from the feeding mechanism 1 and passes through multiple airflow mills 21 in sequence. This not only makes it easy to obtain materials with smaller particle sizes, but also, because the particle size of the material is sorted by the classifying wheels 214 in the multiple airflow mills 21 in sequence along the flow direction of the material, the crushed material can be sorted into multiple grades with progressively smaller particle sizes under the action of the classifying wheels 214 in the multiple airflow mills 21. This allows the material crushing device to obtain materials with multiple particle size grades, which not only meets the needs for materials with different particle size grades, but also makes the particle size distribution in each grade of material relatively concentrated, which is beneficial to improving the quality of the prepared material.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A material crushing device, characterized in that, include: The feeding mechanism includes interconnected air blowing pipes and feed pipes; A crushing assembly is connected to the feeding mechanism. The crushing assembly includes multiple air jet mills connected in series. Each air jet mill includes a crushing bin, a sorting bin, a receiving bin, and a classifying wheel. The sorting bin is connected to the upper side of the crushing bin, and the receiving bin is connected to the lower side of the crushing bin. The classifying wheel is disposed in the sorting bin. Along the flow direction of the material in the multiple air jet mills, the particle size of the material sorted by the classifying wheel in the multiple air jet mills decreases sequentially.

2. The material crushing device according to claim 1, characterized in that, The shredder includes a liner that is detachably attached to the inner wall of the shredder.

3. The material crushing device according to claim 2, characterized in that, The Vickers hardness of the lining is greater than or equal to 1000; the Vickers hardness of the grading wheel is greater than or equal to 1000.

4. The material crushing device according to claim 1, characterized in that, A guide plate is provided on the inner wall of the crushing bin, and the guide plate extends along the axial direction of the crushing bin.

5. The material crushing device according to claim 4, characterized in that, The guide plate is inclined along the rotation direction of the material in the crushing bin, and the included angle between the guide plate and the radial direction of the crushing bin is set to D, where 5°≤D≤10°.

6. The material crushing device according to claim 1, characterized in that, The material crushing device further includes a dispersing mechanism, which includes an airflow nozzle disposed in the crushing bin for introducing airflow into the crushing bin.

7. The material crushing device according to claim 6, characterized in that, The airflow nozzles are provided in multiple locations, and the multiple airflow nozzles are arranged at intervals along the circumference of the crushing bin.

8. The material crushing device according to claim 6, characterized in that, The dispersion mechanism further includes a cooling component and an air intake pipe, the air intake pipe being connected to the airflow nozzle, and the cooling component being able to cool the airflow passing through the air intake pipe.

9. The material crushing device according to claim 8, characterized in that, The refrigeration assembly also includes a water tank and a chiller. The chiller is connected to the water tank to cool the cooling medium in the water tank. The air intake pipe passes through the water tank and exchanges heat with the cooling medium.

10. The material crushing device according to claim 1, characterized in that, The material crushing device also includes a dust removal component, which is connected downstream of the crushing component.

11. The material crushing device according to claim 10, characterized in that, The material crushing device also includes a vacuum pump, which is connected downstream of the dust removal component.

12. The material crushing device according to claim 10, characterized in that, The material crushing device further includes a material collection component, which is connected between the dust removal component and the first of the plurality of air jet mills in the material flow direction.

13. The material crushing device according to claim 12, characterized in that, The material collection assembly includes a cyclone separator and a material collection bin. The inlet of the cyclone separator is connected to the sorting bin of the first air jet mill, the outlet of the cyclone separator is connected to the dust removal assembly, and the material collection bin is connected to the outlet of the cyclone separator.

14. A battery production system, characterized in that, Includes a material crushing device as described in any one of claims 1 to 13, wherein the material crushing device is used to crush the material to be crushed.

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