Ball-milling stirring system applied to sodium-ion battery powder

Abstract

The utility model relates to a ball milling stirring system applied to sodium ion battery powder, which comprises a first stirring device, a second stirring device and a superfine grinding device, the first stirring device is communicated with the superfine grinding device through a first pipeline, and the superfine grinding device is communicated with the second stirring device through a fourth pipeline; the first stirring device is communicated with the second stirring device through a second pipeline or a third pipeline; valves are arranged on the first pipeline, the second pipeline, the third pipeline and the fourth pipeline; wherein each of the first stirring device and the second stirring device comprises a stirring tank, the stirring tank is provided with a stirring main machine and a high-speed dispersion motor, and the stirring tank is communicated with an air inlet of the circulating pneumatic diaphragm pump. The powder slurry preparation device can continuously work and completely meet the powder slurry preparation process requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of powder mechanical processing equipment, in particular to a ball mill stirring system applied to sodium ion battery powder. Background Art

[0002] Based on the characteristics of the raw materials of polyanion materials used in aqueous sodium-ion batteries, a powder wet mixing ball milling system was developed. During the slurry preparation process of the powder, the particle size and dispersion uniformity of the powder are crucial to the later sintering morphology of the powder and even the final electrochemical performance.

[0003] At present, wet ultrafine grinding is a widely used method for nanoparticle agglomerates. It has the advantages of high production efficiency, low cost, simple operation, and not easy to introduce impurities. It is suitable for large-scale industrial production.

[0004] However, many existing standard equipments mix materials by circulating them. Although they can solve the problems of dispersion and deagglomeration of single materials and even particle grinding, they have poor dispersion effect when facing large quantities of difficult-to-process powders with high specific surface area and high viscosity. Moreover, they will cause poor material mixing uniformity and local re-agglomeration. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model discloses a ball mill stirring system applied to sodium ion battery powder.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A ball mill stirring system for sodium ion battery powder, comprising: a first stirring device, a second stirring device and an ultrafine grinding device, wherein the first stirring device is connected to the ultrafine grinding device through a first pipeline, and the ultrafine grinding device is connected to the second stirring device through a fourth pipeline; the first stirring device is connected to the second stirring device through a second pipeline or a third pipeline; the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with valves;

[0008] Wherein, the first stirring device and the second stirring device both include a stirring tank, the stirring tank is provided with a stirring main machine and a high-speed dispersion motor, and the stirring tank is connected to the air inlet of a circulating pneumatic diaphragm pump.

[0009] In one embodiment of the present invention, the first stirring device and the second stirring device are respectively connected to ventilation pipes, and inert gas is introduced into the ventilation pipes.

[0010] In one embodiment of the utility model, the ultrafine grinding device includes a power unit, a first transmission gear, a second transmission gear and a grinding cylinder, the output end of the power unit is connected to the first transmission gear, the outer wall of the grinding cylinder is provided with the second transmission gear, the second transmission gear and the first transmission gear are synchronously meshed and matched; the grinding cylinder is provided with a grinding medium.

[0011] In one embodiment of the present utility model, the power unit includes a servo motor and a reducer, the output end of the servo motor is connected to the input end of the reducer, and the output end of the reducer is connected to the first transmission gear.

[0012] In one embodiment of the present invention, a grinding medium grid collecting plate is provided on the inner wall of the grinding cylinder.

[0013] In one embodiment of the present invention, the grinding medium is a zirconia ball milling bead with a diameter of less than 1 mm.

[0014] In one embodiment of the utility model, the ultrafine grinding device also includes a cooling water circulation device, and the cooling circulation device includes a condenser and a circulation pump. The circulation pump extracts the high-temperature medium from the first stirring device or the second stirring device, cools it through the condenser, and then enters the first stirring device or the second stirring device through the outlet of the condenser.

[0015] In one embodiment of the present invention, the ultrafine grinding device further comprises a support for supporting the grinding cylinder.

[0016] In one embodiment of the present invention, the stirring main unit is connected to a stirring paddle.

[0017] In one embodiment of the present invention, the high-speed dispersion motor is connected to a stirrer.

[0018] The above technical solution of the utility model has the following advantages compared with the prior art:

[0019] The first stirring device and the second stirring device used in the ball mill stirring system for sodium ion battery powder described in the utility model can be internally self-circulated and have primary dispersion and mixing functions, which prevent large particles from directly entering the ultrafine grinding equipment to cause equipment cavity blockage and inconsistent ball milling time of the materials. Especially for high-viscosity viscous slurry, it is necessary to disperse the stirring tank first and the powder is completely infiltrated before ultrafine grinding.

[0020] The first stirring device and the second stirring device used in the ball mill stirring system for sodium ion battery powder described in the utility model can also operate under a protective atmosphere and maintain a constant temperature for temperature-sensitive slurry to prevent slurry denaturation caused by overheating.

[0021] The ball mill stirring system applied to sodium ion battery powder of the utility model can allow continuous processing of powder materials by introducing the first stirring device and the second stirring device, and the operation is more convenient, which has extremely strong practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of a ball mill stirring system used for sodium ion battery powder in the utility model.

[0024] Figure 2 It is a schematic diagram of the first stirring device or the second stirring device in the utility model.

[0025] Figure 3 It is a schematic diagram of the superfine grinding device in the utility model.

[0026] Figure 4 It is a structural schematic diagram of the ball mill mechanism in the utility model.

[0027] Explanation of the reference numerals in the specification: 100, first stirring device; 101, first stirring main unit; 102, first high-speed dispersion motor; 103, first stirring tank; 104, first circulating pneumatic diaphragm pump; 105, first running wheel; 200, second stirring device; 201, second stirring main unit; 202, second high-speed dispersion motor; 203, second stirring tank; 204, second circulating pneumatic diaphragm pump; 205, second running wheel; 300, ultrafine grinding device; 301, servo motor; 302, reducer; 303, first transmission gear; 304, second transmission gear; 305, grinding cylinder; 401, first valve; 402, second valve; 403, third valve; 404, fourth valve; 500, ventilation duct; 600, support; 700, condenser; 800, circulating pump. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention. In addition, in all embodiments, the same reference numerals represent the same elements.

[0030] Reference Figure 1 As shown, a ball mill stirring system for sodium ion battery powder includes: a first stirring device 100, a second stirring device 200 and an ultrafine grinding device 300, the first stirring device 100 is connected to the ultrafine grinding device 300 through a first pipeline, and the ultrafine grinding device 300 is connected to the second stirring device 200 through a fourth pipeline; the first stirring device 100 is connected to the second stirring device 200 through a second pipeline or a third pipeline; the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with valves;

[0031] Wherein, the first stirring device 100 and the second stirring device 200 both include a stirring tank, the stirring tank is provided with a stirring main machine and a high-speed dispersion motor, and the stirring tank is connected to the air inlet of the circulating pneumatic diaphragm pump.

[0032] This embodiment provides a ball mill stirring system for sodium ion battery powder, which is provided with a first stirring device 100 and a second stirring device 200, both of which can be internally self-circulated and have primary dispersion and mixing functions, preventing large particles from directly entering the ultrafine grinding device 300 to cause material blockage in the equipment cavity and inconsistent ball milling time of the material. Especially for high-viscosity viscous slurry, the stirring device is required to disperse first and the powder is completely soaked before ultrafine grinding, so that the powder material can be processed continuously and the operation is more convenient.

[0033] In this embodiment, if Figure 2 As shown, the first stirring device 100 and the second stirring device 200 are respectively connected to the ventilation pipe 500, and an inert gas is introduced into the ventilation pipe 500, wherein the inert gas can be protected by helium, which can prevent oxidation and denaturation of the material during long-term ball milling stirring for certain elements that are sensitive to oxygen.

[0034] In this embodiment, the first stirring device 100 includes a first stirring tank 103, the first stirring tank 103 is provided with a first stirring main unit 101 and a first high-speed dispersion motor 102, and the first stirring tank 103 is connected to the air inlet of the first circulating pneumatic diaphragm pump 104. Among them, the first stirring main unit 101 is connected to the first stirring paddle, and the first high-speed dispersion motor 102 is connected to the first agitator. The first agitator and the first high-speed dispersion motor 102 can be directly connected, and the first high-speed dispersion motor 102 drive can be equipped with a frequency converter control for stepless speed regulation to adapt to the speed required by different processes.

[0035] The second stirring device 200 includes a second stirring tank 203, which is provided with a second stirring main unit 201 and a second high-speed dispersion motor 202, and the second stirring tank 203 is connected to the air inlet of the second circulating pneumatic diaphragm pump 204. The second stirring main unit 201 is connected to the second stirring paddle, and the second high-speed dispersion motor 202 is connected to the second agitator. The second agitator and the second high-speed dispersion motor 202 can be directly connected, and the second high-speed dispersion motor 202 drive can be equipped with a frequency converter control for stepless speed regulation to adapt to the speed required by different processes.

[0036] Furthermore, there are two ways to treat the surface of the inner wall of the first stirring tank 103 and the second stirring tank 203 and the first stirring paddle and the second stirring paddle: 1. Mirror polishing to level 9 accuracy (Ra=0.4μm) to minimize the adhesion of the barrel wall and reduce the adhesion of materials as much as possible; 2. Spraying PTFE (Polytetrafluoroethylene) on the part in contact with the material can effectively reduce the adhesion of viscous materials and improve the increase of magnetic substances in the processed slurry, and the spraying thickness is 0.3mm-0.4mm.

[0037] Furthermore, the first stirring device 100 further includes a first frame for supporting the first stirring tank 103 and a first running wheel 105 disposed at the bottom of the first frame; the second stirring device 200 further includes a second frame for supporting the second stirring tank 203 and a second running wheel 205 disposed at the bottom of the second frame. The first running wheel 105 and the second running wheel 205 facilitate the operator to push the stirring device to a designated location for repair and maintenance.

[0038] It should be noted that the high-speed dispersing motor and agitator are mainly used for the rapid dispersion and fusion of dry powder and liquid and the uniformity treatment of solids in liquid suspension; the stirring host and stirring paddle are mainly used to maintain the stratification of solids in liquid suspension; for viscous slurries that are easy to adhere to the wall, a soft scraper can be designed on the stirring paddle. The scraper is of fixed type or centrifugal dynamic type, which can be selected according to the viscosity of the material.

[0039] In addition, the first stirring paddle and the second stirring paddle can be frame-type, propeller-type, inclined blade-type, axial flow-type, spiral ribbon-type or other forms of stirring paddles; the first agitator and the second agitator can be flat-toothed, pointed-toothed, double-layered, staggered-layered or other forms of agitators. The first stirring paddle, the second stirring paddle, the first agitator and the second agitator can be selected and adjusted by technicians in this field according to needs.

[0040] In this embodiment, a first valve 401 is provided on the first pipeline, a second valve 402 is provided on the second pipeline, a third valve 403 is provided on the third pipeline, and a fourth valve 404 is provided on the fourth pipeline. The first valve 401, the second valve 402, the third valve 403 and the fourth valve 404 are used to control the on and off of the pipelines.

[0041] In this embodiment, combined with Figure 3 and Figure 4 The ultrafine grinding device 300 includes a power unit, a first transmission gear 303, a second transmission gear 304 and a grinding cylinder 305. The output end of the power unit is connected to the first transmission gear 303. The outer wall of the grinding cylinder 305 is provided with a second transmission gear 304. The second transmission gear 304 and the first transmission gear 303 are synchronously meshed and matched; the grinding cylinder 305 is provided with a grinding medium.

[0042] Specifically, the power unit includes a servo motor 301 and a reducer 302 , the output end of the servo motor 301 is connected to the input end of the reducer 302 , and the output end of the reducer 302 is connected to the first transmission gear 303 .

[0043] Furthermore, a grinding medium grid collecting plate (not shown) is provided on the inner wall of the grinding cylinder 305. The grinding medium grid collecting plate is a grid structure composed of many small holes, and its main function is to separate the grinding medium and the grinding ore particles. During the operation of the ball mill, due to the special properties of the grinding ore particles and the grinding medium, they are prone to accumulation. If they are not removed in time, the normal operation of the ball mill will be affected. At this time, the ball mill grid plate comes in handy. It can separate the grinding medium from the grinding ore particles while ensuring that the grinding ore particles are fully worn, so that the grinding medium can roll smoothly and re-participate in the grinding work, thereby ensuring the normal operation of the ball mill. Among them, the grinding medium is a zirconium oxide ball milling bead with a diameter of less than 1mm.

[0044] In this embodiment, if Figure 3 As shown, the ultrafine grinding device 300 also includes a cooling water circulation device, which includes a condenser 700 and a circulation pump 800. The circulation pump 800 extracts the high-temperature medium from the first stirring device 100 or the second stirring device 200, cools it through the condenser 700, and then enters the first stirring device 100 or the second stirring device 200 through the outlet of the condenser 700.

[0045] In this embodiment, if Figure 3 As shown, the ultrafine grinding device 300 also includes a support 600 for supporting the grinding cylinder 305. A track can be designed on the support 600, and the ultrafine grinding device 300 can slide along the track, which is convenient for maintenance and repair of the ultrafine grinding device 300.

[0046] The working principle of the utility model is as follows:

[0047] When the first valve 401 and the third valve 403 are both open, and the second valve 402 and the fourth valve 404 are both closed, the first stirring device 100 and the ultrafine grinding device 300 form a loop, and the material first passes through the first stirring device 100 for preliminary treatment. The first stirring device 100 itself has a slurry self-circulation, so that the slurry is dispersed more evenly, and the processing time of all materials is more uniform, which prevents the powder from being processed inconsistently in the ultrafine grinding device 300 due to the single transmission of the slurry. Especially for large quantities of materials with low solid content. Subsequently, the preliminarily treated materials enter the ultrafine grinding device 300 for re-processing. The ball milling linear speed of the ultrafine grinding device 300 is in the range of 2m / s-15m / s. The ultrafine grinding device 300 is used to perform strong shearing on the materials to achieve material nano-crystallization.

[0048] When the material in the ultrafine grinding device 300 is ground, the second valve 402 and the third valve 403 are closed, the first valve 401 and the fourth valve 404 are opened, and the material is transported from the ultrafine grinding device 300 to the second stirring device 200 for further processing, which fully meets the slurry preparation process requirements of the powder.

[0049] It should be noted that when the ultrafine grinding device 300 fails, it is not necessary to connect the first stirring device 100 and the second stirring device 200 to the ultrafine grinding device 300. Only the second valve 402 needs to be opened to connect the first stirring device 100 and the second stirring device 200. That is, the material first passes through the first stirring device 100 for preliminary processing, and then enters the second stirring device 200 for further processing.

[0050] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A ball mill stirring system for sodium ion battery powder, characterized in that: include: A first stirring device (100), a second stirring device (200) and an ultrafine grinding device (300), wherein the first stirring device (100) is connected to the ultrafine grinding device (300) via a first pipeline, and the ultrafine grinding device (300) is connected to the second stirring device (200) via a fourth pipeline; the first stirring device (100) is connected to the second stirring device (200) via a second pipeline or a third pipeline; and the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all provided with valves; Wherein, the first stirring device (100) and the second stirring device (200) both comprise a stirring tank, the stirring tank is provided with a stirring main unit and a high-speed dispersion motor, and the stirring tank is connected to an air inlet of a circulating pneumatic diaphragm pump.

2. The ball mill stirring system for sodium ion battery powder according to claim 1, characterized in that: The first stirring device (100) and the second stirring device (200) are respectively connected to a ventilation pipe (500), and an inert gas is introduced into the ventilation pipe (500).

3. The ball mill stirring system for sodium ion battery powder according to claim 1, characterized in that: The ultrafine grinding device (300) comprises a power unit, a first transmission gear (303), a second transmission gear (304) and a grinding cylinder (305); the output end of the power unit is connected to the first transmission gear (303); the outer wall of the grinding cylinder (305) is provided with the second transmission gear (304); the second transmission gear (304) and the first transmission gear (303) are synchronously meshed; and a grinding medium is provided in the grinding cylinder (305).

4. The ball mill stirring system for sodium ion battery powder according to claim 3, characterized in that: The power unit comprises a servo motor (301) and a reducer (302), wherein the output end of the servo motor (301) is connected to the input end of the reducer (302), and the output end of the reducer (302) is connected to the first transmission gear (303).

5. The ball mill stirring system for sodium ion battery powder according to claim 3, characterized in that: The inner wall of the grinding cylinder (305) is provided with a grinding medium grid collection plate.

6. The ball mill stirring system for sodium ion battery powder according to claim 3, characterized in that: The grinding medium is a zirconium oxide ball milling bead with a diameter of less than 1 mm.

7. The ball mill stirring system for sodium ion battery powder according to claim 3, characterized in that: The ultrafine grinding device (300) further comprises a cooling water circulation device, wherein the cooling water circulation device comprises a condenser (700) and a circulation pump (800), wherein the circulation pump (800) extracts high-temperature medium from the first stirring device (100) or the second stirring device (200), cools the medium through the condenser (700), and then enters the first stirring device (100) or the second stirring device (200) through the outlet of the condenser (700).

8. The ball mill stirring system for sodium ion battery powder according to claim 3, characterized in that: The ultrafine grinding device (300) further comprises a support (600) for supporting the grinding cylinder (305).

9. The ball mill stirring system for sodium ion battery powder according to claim 1, characterized in that: The stirring main machine is connected to a stirring paddle.

10. The ball mill stirring system for sodium ion battery powder according to claim 1, characterized in that: The high-speed dispersing motor is connected to the stirrer.

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