Material grinding equipment and battery manufacturing system

Abstract

The utility model discloses material grinding equipment and a battery manufacturing system. The material grinding equipment comprises a grinding cylinder, a conveying pipe and a stirring assembly. The grinding cylinder is provided with a grinding cavity, a feeding hole and a discharging hole; the conveying pipe is arranged in the grinding cavity, a feeding port of the conveying pipe is connected with the feeding port in a sealed mode, a discharging port of the conveying pipe is communicated with the grinding cavity, the conveying pipe is used for conveying materials to be ground into the grinding cavity, and at least part of the conveying pipe is bent. The stirring assembly is arranged in the grinding cylinder and used for stirring materials to be ground. And the conveying pipe is arranged to be bent, so that the material staying time is prolonged, the arrangement of a coarse grinding barrel is omitted, and the space occupied by the equipment is reduced. In addition, certain friction can be formed between the conveying pipeline and the materials, and the material grinding efficiency is further improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a material grinding device and a battery manufacturing system. Background Art

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and energy storage systems, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] At present, how to improve the production efficiency of batteries is also one of the technical issues being studied in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a material grinding device and a battery manufacturing system, which can reduce the volume occupied by the equipment, improve the material grinding efficiency, and improve the production efficiency of the battery.

[0005] In a first aspect, the present application provides a material grinding device, comprising a grinding cylinder, a conveying pipe and a stirring assembly. The grinding cylinder has a grinding chamber, and the grinding cylinder is provided with a feed port and a discharge hole. The conveying pipe is arranged in the grinding chamber, the feed port of the conveying pipe is sealedly connected to the feed port, the discharge port of the conveying pipe is communicated with the grinding chamber, the conveying pipe is used to input the material to be ground into the grinding chamber, and at least part of the conveying pipe is curved. The stirring assembly is arranged in the grinding cylinder, and the stirring assembly is used to stir the material to be ground.

[0006] In the technical solution of the embodiment of the present application, a grinding cylinder is provided to grind the material while accommodating a conveying pipe, and the material after rough grinding by the sand mill is conveyed in the conveying pipe. The conveying pipe is provided with a curved shape to extend the retention time of the material, and the provision of a rough grinding cylinder is eliminated, thereby reducing the space occupied by the equipment. In addition, a certain friction can be formed between the conveying pipe and the material, further improving the efficiency of material grinding.

[0007] In some embodiments, the feed port is provided on the wall of the grinding cylinder, a discharge port is provided at one end of the grinding cylinder, and an exhaust hole is provided at the other end of the grinding cylinder. In the above embodiments, the discharge port and the exhaust hole are provided at opposite ends of the grinding cylinder, which can improve the pressure balance inside the grinding cylinder, improve the grinding efficiency and the stability of the equipment operation.

[0008] In some embodiments, the delivery pipe is arranged along the inner wall of the grinding cylinder and extends along the axial direction thereof. In the above embodiments, the delivery pipe is arranged along the inner wall of the grinding cylinder, which can increase the space inside the grinding cylinder and improve the efficiency of material grinding. The delivery pipe is extended in the axial direction, and the delivery pipe can be arranged to be consistent with the grinding direction, thereby improving the grinding efficiency of the stirring device.

[0009] In some embodiments, there are two conveying pipes, and the two conveying pipes are arranged at intervals along the radial direction of the grinding cylinder. In the above structure, the number of conveying pipes is increased, the amount of materials conveyed by the conveying pipes is increased, and the production efficiency is improved. In addition, by setting up multiple conveying pipes, the material flow rate of each conveying pipe can be adjusted according to actual needs to achieve more flexible production control. For example, when processing materials of different properties or particle sizes, the grinding effect can be optimized by adjusting the flow rate of the conveying pipe.

[0010] In some embodiments, the grinding cylinder further includes a connecting piece, and the connecting piece includes a feed section and two connecting sections. The feed section is arranged in the feed port, and a feed port and two connecting ports are provided on the feed section. The two connecting sections are respectively connected to the two connecting ports, and the two connecting sections are respectively connected to the two conveying pipes. In the above technical scheme, the two conveying pipes are connected by arranging a connecting piece. By introducing the connecting piece to connect the two conveying pipes together, and realizing uniform distribution and efficient conveying of materials, not only the production efficiency of the equipment is improved, but also the stability and reliability of the equipment are enhanced.

[0011] In some embodiments, the stirring assembly includes a stirring paddle and a stirring motor. The stirring paddle is disposed in the grinding chamber, and the stirring motor is connected to the stirring paddle to drive the stirring paddle to rotate in the grinding chamber. In the above structure, the stirring paddle is disposed in the grinding chamber, and its main function is to stir the material so that the material is more evenly distributed and mixed during the grinding process. This helps to prevent the material from agglomerating or stratifying in the grinding chamber, thereby improving the grinding efficiency and product quality. Therefore, the stirring paddle and the stirring motor can improve the mixing uniformity and grinding efficiency of the grinding equipment when processing materials, and reduce energy consumption and time costs in the production process.

[0012] In some embodiments, the stirring paddle includes a stirring shaft and a plurality of stirring blades. The stirring shaft is arranged along the axial direction of the grinding cylinder, and one end of the stirring shaft is connected to the stirring motor. A plurality of stirring blades are connected to the stirring shaft, and the plurality of stirring blades are arranged at intervals along the axial direction of the grinding cylinder. In the above structure, the stirring shaft is arranged along the axial direction of the grinding cylinder, and one end of the stirring shaft is connected to the stirring motor. Such a layout enables the stirring paddle to rotate along the axial direction of the grinding cylinder under the drive of the motor. The stirring shaft serves as a support and transmission component for the stirring blades. A plurality of stirring blades are connected to the stirring shaft, and these stirring blades are arranged at intervals along the axial direction of the grinding cylinder, ensuring that the stirring paddle can stir and grind the material in the grinding chamber at multiple points and multiple levels when rotating. Since the stirring blades are distributed in the axial direction, they can act on the material at different positions, thereby achieving a more uniform grinding effect. At the same time, multi-point stirring also helps to increase the contact frequency and contact area between the material and the grinding medium, thereby improving the grinding efficiency.

[0013] In some embodiments, the outer surface of the conveying tube protrudes outward to form grinding protrusions. The grinding protrusions on the outer surface of the conveying tube can increase the contact area and friction between the materials, thereby achieving a certain degree of grinding during the material conveying process. In addition, the presence of the grinding protrusions can destroy the laminar state of the materials during the conveying process and promote the mixing and exchange between the materials. This helps to prevent the materials from being stratified or agglomerated, and ensures that the materials are more evenly distributed in the grinding chamber. Therefore, the above structure can improve the grinding efficiency of the materials.

[0014] In some embodiments, the delivery pipe includes any one of a stainless steel pipe, a tetrafluoroethylene pipe, a polyvinyl chloride pipe or a rubber pipe. The above materials all have high structural strength and corrosion resistance, and can ensure the stability of material delivery.

[0015] In a second aspect, the present application provides a battery manufacturing system, which includes the material grinding equipment in the above embodiment.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0021] Figure 4 This is a schematic structural diagram of a material grinding device according to an embodiment of the present application.

[0022] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0023] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Shell; 201. Receiving groove; 24. Pressure relief mechanism; 25. Electrode terminal; 30. End cover; 40. Shell; 3. Controller; 4. Motor; 5. Box; 51. First part; 52. Second part; 53. Accommodating space; 6. Material grinding equipment; 601. Grinding cylinder; 602. Delivery pipe; 603. Stirring assembly; 604. Grinding chamber; 605. Feed inlet; 606. Discharge outlet; 607. Exhaust hole; 608. Connector; 609. Stirring paddle; 610. Stirring motor; 611. Stirring shaft; 612. Stirring blade; 7. Battery cell. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] 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.

[0032] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for one embodiment of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery 2 may be provided at the bottom, head or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0033] In some embodiments of the present application, the battery 2 can be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0034] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0035] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the exploded structure of a battery provided in one embodiment of the present application. The battery includes a box body 5 and a battery cell 7, and the battery cell is accommodated in the box body. The box body is used to provide a storage space for the battery cell, and the box body can adopt a variety of structures.

[0036] In some optional embodiments, the box body 5 includes a first part 51 and a second part 52 , the first part 51 and the second part 52 cover each other, and the first part 51 and the second part 52 jointly define an accommodating space 53 for accommodating the battery cell 7 .

[0037] In some embodiments, the box 5 can be used as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least a part of the floor of the vehicle 1, or part of the box 5 can become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0038] In the battery 2, there can be multiple battery cells 7, and the multiple battery cells 7 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 7 are both connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 7 is accommodated in the box 5. Of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 7 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 accommodated in the box 5. The battery 2 can also include other structures, for example, the battery 2 can also include a converging component for realizing the electrical connection between the multiple battery cells 7.

[0039] Each battery cell 7 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 7 may be cylindrical, flat, rectangular or in other shapes.

[0040] In some embodiments, the battery cells 7 are connected by busbars to realize series or parallel connection of the circuits. Exemplarily, the busbars include busbars, busbars, and the like.

[0041] Please refer to Figure 3 , Figure 3The schematic diagram of the exploded structure of the battery cell 7 provided in some embodiments of the present application. The battery cell 7 refers to the smallest unit that constitutes the battery 2. Figure 3 The battery cell 7 includes a housing 40, an electrode assembly 10 and other functional components.

[0042] The outer shell 40 may include an end cap 30 and a shell 20. The end cap 30 refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap 30 may be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 may be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the end cap 30 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 25 may be provided on the end cap 30. The electrode terminal 25 can be used to be electrically connected to the electrode assembly 10 for outputting or inputting electrical energy of the battery cell 7.

[0043] In some embodiments, a pressure relief mechanism 24 for releasing the internal pressure when the internal pressure or temperature of the battery cell 7 reaches a threshold value may also be provided on the end cap 30. The material of the end cap 30 may also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in the embodiments of the present application.

[0044] The housing 20 is a component used to cooperate with the end cap 30 to form the internal environment of the battery cell 7. The formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte and other components. The housing 20 and the end cap 30 can be independent components, and an opening can be set on the housing 20, and the internal environment of the battery cell 7 is formed by covering the opening with the end cap 30.

[0045] The electrode assembly 10 is a component in the battery cell 7 where electrochemical reactions occur. One or more electrode assemblies 10 may be included in the housing 20. Multiple electrode assemblies 10 constitute an electrode unit. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 7, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through. In some embodiments, the electrode assembly 10 also includes a separator, which is arranged between the positive electrode and the negative electrode.

[0046] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0047] In some embodiments, the battery cell 7 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0048] In some embodiments, the electrode assembly 10 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure. In some embodiments, the electrode assembly 10 is a laminated structure. In some embodiments, the shape of the electrode assembly 10 can be cylindrical, flat, or multi-prism, etc. In some embodiments, the electrode assembly 10 is provided with a pole ear, and the pole ear can lead the current from the electrode assembly 10. The pole ear includes a positive pole ear and a negative pole ear.

[0049] In the production process of battery cells, the active material layer contains active powder. In order to improve the charge and discharge efficiency and cycle life of the battery, the active powder usually needs to be ground, which places high demands on the efficiency of grinding. In the related art, grinding usually requires two steps. After the raw material is ground in the first grinding cylinder, it is transported to the second grinding cylinder for secondary grinding to meet the particle size requirements. However, the above-mentioned grinding process requires the setting of two grinding tanks, which takes up a large space, and the uniformity of the secondary grinding process is poor, time-consuming, and the grinding cost is high.

[0050] Therefore, based on the above considerations, the embodiment of the present application provides a material grinding device and a battery manufacturing system, wherein a grinding cylinder is provided to accommodate a conveying pipe inside while grinding the material, and the material after rough grinding by the sand mill is conveyed in the conveying pipe. The conveying pipe is provided with a curved shape to extend the time for the material to stay, and the provision of a rough grinding cylinder is cancelled, thereby reducing the space occupied by the equipment. In addition, a certain friction can be formed between the conveying pipe and the material, further improving the efficiency of material grinding and reducing production costs.

[0051] The material grinding equipment of the embodiment of the present application is described in detail below in conjunction with the accompanying drawings. Figure 4 , which is a structural schematic diagram of a material grinding device according to an embodiment of the present application.

[0052] As shown in the figure, the material grinding device 6 includes a grinding cylinder 601, a conveying pipe 602 and a stirring assembly 603. The grinding cylinder 601 has a grinding chamber 604, and the grinding cylinder 601 is provided with a feed port 605 and a discharge hole. The conveying pipe 602 is arranged in the grinding chamber 604, the feed port of the conveying pipe 602 is sealed and connected with the feed port 605, and the discharge port 606 of the conveying pipe 602 is connected with the grinding chamber 604. The conveying pipe 602 is used to input the material to be ground into the grinding chamber 604, and at least part of the conveying pipe 602 is curved. The stirring assembly 603 is arranged in the grinding cylinder 601, and the stirring assembly 603 is used to stir the material to be ground.

[0053] In the above structure, the delivery pipe 602 is used to connect with the sand mill, and the sand mill grinds the raw material for the first time to obtain the coarsely ground material, and the coarsely ground material enters the material grinding device 6 through the delivery pipe 602. The grinding cylinder 601 can be a structure with certain structural strength and corrosion resistance. The shape of the grinding chamber 604 is similar to a cylinder, which can reduce the deposition of the material and improve the grinding efficiency.

[0054] In the technical solution of the embodiment of the present application, the grinding cylinder 601 is provided to grind the material while accommodating the conveying pipe 602, and the material after rough grinding by the sand mill is conveyed in the conveying pipe 602. The conveying pipe 602 is provided with a curved shape to extend the time for the material to stay, and the provision of the rough grinding cylinder 601 is cancelled, thereby reducing the space occupied by the equipment. In addition, a certain friction can be formed between the conveying pipe 602 and the material, further improving the efficiency of material grinding.

[0055] In some embodiments of the present application, the feed port 605 is provided on the wall of the grinding cylinder 601, a discharge port 606 is provided at one end of the grinding cylinder 601, and an exhaust hole 607 is provided at the other end of the grinding cylinder 601. In the above embodiments, the discharge port 606 and the exhaust hole 607 are provided at opposite ends of the grinding cylinder 601, which can improve the pressure balance inside the grinding cylinder 601, improve the grinding efficiency and the stability of the equipment operation.

[0056] In some embodiments of the present application, the delivery pipe 602 is arranged along the inner wall of the grinding cylinder 601 and extends along its axial direction. Exemplarily, the delivery pipe 602 is spiral. In the above embodiments, the delivery pipe 602 is arranged along the inner wall of the grinding cylinder 601, which can increase the space inside the grinding cylinder 601 and improve the efficiency of material grinding. The delivery pipe 602 is extended in the axial direction, and the delivery pipe 602 can be arranged to be consistent with the grinding direction, thereby improving the grinding efficiency of the stirring device.

[0057] In some embodiments of the present application, there are two delivery pipes 602, and the two delivery pipes 602 are spaced apart along the radial direction of the grinding cylinder 601. In the above structure, the number of delivery pipes 602 is increased, the amount of material delivered by the delivery pipes 602 is increased, and the production efficiency is improved. In addition, by setting a plurality of delivery pipes 602, the material flow rate of each delivery pipe 602 can be adjusted according to actual needs to achieve more flexible production control. For example, when processing materials of different properties or particle sizes, the grinding effect can be optimized by adjusting the flow rate of the delivery pipe 602.

[0058] In some embodiments of the present application, the grinding cylinder 601 further includes a connector 608, and the connector 608 includes a feed section and two connecting sections. The feed section is arranged in the feed port 605, and a feed port 605 and two connecting ports are provided on the feed section. The two connecting sections are respectively connected to the two connecting ports, and the two connecting sections are respectively connected to the two conveying pipes 602. In the above technical scheme, the two conveying pipes 602 are connected by arranging the connector 608. By introducing the connector 608 to connect the two conveying pipes 602 together, and realizing uniform distribution and efficient conveying of materials, not only the production efficiency of the equipment is improved, but also the stability and reliability of the equipment are enhanced.

[0059] In some embodiments of the present application, the stirring assembly 603 includes a stirring paddle 609 and a stirring motor 610. The stirring paddle 609 is disposed in the grinding chamber 604, and the stirring motor 610 is connected to the stirring paddle 609 to drive the stirring paddle 609 to rotate in the grinding chamber 604. In the above structure, the stirring paddle 609 is disposed in the grinding chamber 604, and its main function is to stir the material so that the material is more evenly distributed and mixed during the grinding process. This helps to prevent the material from agglomerating or stratifying in the grinding chamber 604, thereby improving the grinding efficiency and product quality. Therefore, the stirring paddle 609 and the stirring motor 610 can improve the mixing uniformity and grinding efficiency of the grinding equipment when processing materials, and reduce energy consumption and time costs in the production process.

[0060] In some embodiments of the present application, the stirring paddle 609 includes a stirring shaft 611 and a plurality of stirring blades 612. The stirring shaft 611 is arranged along the axial direction of the grinding cylinder 601, and one end of the stirring shaft 611 is connected to the stirring motor 610. The plurality of stirring blades 612 are connected to the stirring shaft 611, and the plurality of stirring blades 612 are arranged at intervals along the axial direction of the grinding cylinder 601.

[0061] In the above structure, the stirring shaft 611 is arranged along the axial direction of the grinding cylinder 601, and one end of the stirring shaft 611 is connected to the stirring motor 610. Such a layout enables the stirring paddle 609 to rotate along the axial direction of the grinding cylinder 601 under the drive of the motor. The stirring shaft 611 serves as a support and transmission component for the stirring blade 612. A plurality of stirring blades 612 are connected to the stirring shaft 611, and these stirring blades 612 are arranged at intervals along the axial direction of the grinding cylinder 601, ensuring that the stirring paddle 609 can stir and grind the material in the grinding chamber 604 at multiple points and multiple levels when rotating. Since the stirring blades 612 are distributed in the axial direction, they can act on the material at different positions, thereby achieving a more uniform grinding effect. At the same time, multi-point stirring also helps to increase the contact frequency and contact area between the material and the grinding medium, thereby improving the grinding efficiency.

[0062] In some embodiments of the present application, the outer surface of the delivery tube 602 protrudes outward to form a grinding protrusion. The grinding protrusion on the outer surface of the delivery tube 602 can increase the contact area and friction between the material, thereby achieving a certain degree of grinding during the material transportation process. In addition, the presence of the grinding protrusion can destroy the laminar state of the material during the transportation process and promote the mixing and exchange between the materials. This helps to prevent the material from being stratified or agglomerated, and ensures that the material is more evenly distributed in the grinding chamber 604. Therefore, the above structure can improve the grinding efficiency of the material.

[0063] In some embodiments of the present application, the delivery pipe 602 includes any one of a stainless steel pipe, a tetrafluoroethylene pipe, a polyvinyl chloride pipe or a rubber pipe. The above materials all have high structural strength and corrosion resistance, and can ensure the stability of material delivery.

[0064] In some optional embodiments, the material grinding device 6 includes a grinding cylinder 601, a conveying pipe 602 and a stirring assembly 603. The grinding cylinder 601 has a grinding chamber 604, and the grinding cylinder 601 is provided with a feed port 605 and a discharge hole. The conveying pipe 602 is arranged in the grinding chamber 604, the feed port of the conveying pipe 602 is sealed and connected with the feed port 605, the discharge port 606 of the conveying pipe 602 is connected with the grinding chamber 604, the conveying pipe 602 is used to input the material to be ground into the grinding chamber 604, and at least part of the conveying pipe 602 is curved. The stirring assembly 603 is arranged in the grinding cylinder 601, and the stirring assembly 603 is used to stir the material to be ground. The feed port 605 is arranged on the cylinder wall of the grinding cylinder 601, one end of the grinding cylinder 601 is provided with a discharge port 606, and the other end of the grinding cylinder 601 is provided with an exhaust hole 607. The conveying pipe 602 is arranged along the inner wall of the grinding cylinder 601 and extends along its axial direction. Exemplarily, the delivery pipe 602 is spiral. The angle between the spiral delivery pipe 602 and the horizontal direction is 2° to 25°. Exemplarily, the angle between the delivery pipe 602 and the horizontal direction is 3°, 7°, 10°, 12°, 15°, 18°, 20°, 22° or 25°. The maximum diameter of the delivery pipe 602 is 0.8 to 3 times the diameter of the feed port 605 of the grinding cylinder 601. The area of ​​the delivery pipe 602 laid in the grinding cylinder 601 accounts for 30%-300% of the inner surface area of ​​the entire grinding cylinder 601. The number of turns of the spiral delivery pipe 602 is greater than or equal to 8 turns.

[0065] There are two conveying pipes 602, and the two conveying pipes 602 are arranged at intervals along the radial direction of the grinding cylinder 601. The grinding cylinder 601 also includes a connecting piece 608, and the connecting piece 608 includes a feeding section and two connecting sections. The feeding section is arranged in the feeding port 605, and a feeding port 605 and two connecting ports are provided on the feeding section. The two connecting sections are respectively connected to the two connecting ports, and the two connecting sections are respectively connected to the two conveying pipes 602. The stirring assembly 603 includes a stirring paddle 609 and a stirring motor 610. The stirring paddle 609 is arranged in the grinding chamber 604, and the stirring motor 610 is connected to the stirring paddle 609, and is used to drive the stirring paddle 609 to rotate in the grinding chamber 604. The stirring paddle 609 includes a stirring shaft 611 and a plurality of stirring blades 612. The stirring shaft 611 is arranged along the axial direction of the grinding cylinder 601, and one end of the stirring shaft 611 is connected to the stirring motor 610. A plurality of stirring blades 612 are connected to the stirring shaft 611 , and the plurality of stirring blades 612 are arranged at intervals along the axial direction of the grinding cylinder 601 .

[0066] The grinding effect of the above-mentioned material grinding equipment is explained below through comparative examples and specific embodiments.

[0067] Comparative Example 1

[0068] The grinding device includes two mixing tanks, A mixing tank (volume 300L) and B mixing tank (volume 300L). The material in mixing tank A flows into the sand mill from mixing tank A by opening the valve. After the first sand milling, it flows into mixing tank B through the connecting pipe and opens the valve. Then the slurry in tank B is pumped into tank A by a pump for the second grinding. The grinding chamber of the sand mill is 90L.

[0069] Embodiment 1

[0070] The volume of the grinding chamber is 300L, the angle between the spiral conveying pipe and the horizontal direction is 5°, the diameter of the grinding cylinder feed port is 5cm, and the diameter of the conveying pipe is 8cm; the conveying pipe is made of stainless steel; the flow direction of the conveying pipe is consistent with the stirring direction, the axial spacing between two adjacent circles of the conveying pipe is 2cm, and the number of rotations of the conveying pipe is 15 circles.

[0071] The raw materials are first transported to the grinding cylinder, and then connected to the pipeline to be transported to the sand mill. The grinding chamber of the sand mill is 90L. The materials that have been ground by the sand mill for the first time are transported to the conveying pipe through the feed port, and the materials flow into the grinding chamber again through the conveying pipe. The stirring component in the grinding chamber stirs and grinds the materials for the second time to obtain the ground materials.

[0072] Embodiment 2

[0073] The volume of the grinding chamber is 300L, the angle between the spiral conveying pipe and the horizontal direction is 10°, the diameter of the grinding cylinder feed port is 5cm, and the diameter of the conveying pipe is 5cm; the conveying pipe is a PVC pipe; the flow direction of the conveying pipe is consistent with the stirring direction, the axial spacing between two adjacent circles of the conveying pipe is 4cm, and the number of rotations of the conveying pipe is 10 circles.

[0074] The raw materials are first transported to the grinding cylinder, and then connected to the pipeline to be transported to the sand mill. The grinding chamber of the sand mill is 90L. The materials that have been ground by the sand mill for the first time are transported to the conveying pipe through the feed port, and the materials flow into the grinding chamber again through the conveying pipe. The stirring component in the grinding chamber stirs and grinds the materials for the second time to obtain the ground materials.

[0075] In Comparative Example 1, Example 1 and Example 2, 150 L of water and 50 kg of alumina were added, and the initial particle size of the alumina and the particle size after grinding were shown in Table 1 below after grinding for the same time under the same environmental conditions.

[0076]

[0077] It can be seen from the above table data that after grinding for 0.5 hours, the particle sizes of Examples 1 and 2 are not only smaller than those of Comparative Example 1, but also have fewer large and small particles, and the particle size uniformity is high.

[0078] Moreover, after 2 hours of grinding, the particle size is close to that of 0.5 hours, indicating that the material grinding equipment of Example 1 and Example 2 has completed the grinding within the initial 0.5 hours of grinding time and achieved the best grinding effect. Therefore, the material grinding equipment of the embodiment of the present application can fully grind the material in a shorter time, improve the grinding effect and production efficiency. In addition, the setting of one grinding cylinder is reduced, the space occupied by grinding is reduced, the cost is reduced and the efficiency is improved.

[0079] The embodiments of the present application also provide a battery manufacturing system, which includes the material grinding equipment in the above embodiments. The grinding cylinder is set to accommodate the conveying pipe while grinding the material, and the material after rough grinding by the sand mill is conveyed in the conveying pipe. The conveying pipe is set to be curved to extend the residence time of the material, and the setting of the rough grinding cylinder is cancelled, which reduces the space occupied by the equipment. In addition, a certain friction can be formed between the conveying pipeline and the material, which further improves the efficiency of material grinding and reduces production costs.

[0080] 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 material grinding device (6), characterized in that: include: A grinding cylinder (601) having a grinding chamber (604), wherein the grinding cylinder (601) is provided with a feed inlet (605) and a discharge hole; A conveying pipe (602) is arranged in the grinding chamber (604); an inlet of the conveying pipe (602) is sealedly connected to the feed inlet (605); an outlet (606) of the conveying pipe (602) is communicated with the grinding chamber (604); the conveying pipe (602) is used to input the material to be ground into the grinding chamber (604); at least a portion of the conveying pipe (602) is curved; The stirring component (603) is disposed in the grinding cylinder (601), and the stirring component (603) is used to stir the material to be ground.

2. The material grinding device (6) according to claim 1, characterized in that: The feed port (605) is arranged on the wall of the grinding cylinder (601), one end of the grinding cylinder (601) is provided with a discharge port (606), and the other end of the grinding cylinder (601) is provided with an exhaust hole (607).

3. The material grinding device (6) according to claim 2, characterized in that: The delivery pipe (602) is arranged along the inner wall of the grinding cylinder (601) and extends along the axial direction thereof.

4. The material grinding device (6) according to claim 3, characterized in that: The number of the delivery pipes (602) is two, and the two delivery pipes (602) are arranged at intervals along the radial direction of the grinding cylinder (601).

5. The material grinding device (6) according to claim 4, characterized in that: The grinding cylinder (601) further comprises a connecting member (608), wherein the connecting member (608) comprises: A feeding section is arranged in the feeding port (605), and the feeding section is provided with a feeding port (605) and two connecting ports; The two connecting sections are respectively connected to the two connecting ports, and the two connecting sections are respectively connected to the two conveying pipes (602).

6. The material grinding device (6) according to any one of claims 1 to 5, characterized in that: The stirring assembly (603) comprises: A stirring paddle (609) is disposed in the grinding chamber (604); A stirring motor (610) is connected to the stirring paddle (609) and is used to drive the stirring paddle (609) to rotate in the grinding chamber (604).

7. The material grinding device (6) according to claim 6, characterized in that: The stirring paddle (609) comprises: A stirring shaft (611) is arranged along the axial direction of the grinding cylinder (601), and one end of the stirring shaft (611) is connected to the stirring motor (610); A plurality of stirring blades (612) are connected to the stirring shaft (611), and the plurality of stirring blades (612) are arranged at intervals along the axial direction of the grinding cylinder (601).

8. The material grinding device (6) according to any one of claims 1 to 5, characterized in that: The outer surface of the delivery tube (602) protrudes outward to form a grinding protrusion.

9. The material grinding device (6) according to any one of claims 1 to 5, characterized in that: The delivery pipe (602) includes any one of a stainless steel pipe, a tetrafluoroethylene pipe, a polyvinyl chloride pipe or a rubber pipe.

10. A battery (2) manufacturing system, characterized in that: It comprises the material grinding equipment (6) as claimed in any one of claims 1 to 9.

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