Graphite negative electrode material preparation system

Abstract

The utility model relates to the technical field of lithium battery material preparation, and discloses a graphite cathode material preparation system which comprises a powder preparation module, a grading module and a dust removal module. The dust removal module is provided with a plurality of dust removal devices and a filtering device, the plurality of dust removal devices are respectively arranged at the outlet of the pulverizing equipment and the outlet of the grading equipment, and the filtering device is respectively communicated with the dust removal devices through dust removal pipelines. According to the utility model, dust generated in the process of pulverizing the graphite cathode material by the pulverizing equipment and the process of conveying the pulverized material to the grading equipment for grading treatment is timely collected by the dust removal device and is purified, so that the problem of dust diffusion of the graphite cathode material in the crushing and pulverizing process is effectively solved; the cleanness and safety of the production environment are ensured, and the harm of dust to the health of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery material preparation, in particular to a graphite negative electrode material preparation system. Background Art

[0002] With the rapid development of the new energy industry, the demand for lithium-ion batteries, as a highly efficient energy storage device, continues to grow. As a key component of lithium-ion batteries, the performance and quality of graphite anode materials directly affect the performance and safety of the batteries.

[0003] The traditional preparation process for graphite anode materials mainly includes crushing and pulverizing, granulation, graphitization, and screening and demagnetization. The crushing and pulverizing process often presents a serious dust problem. Specifically, during the crushing and pulverizing process, mechanical crushing and grinding operations generate a large number of fine particles, which easily become airborne and form dust. Furthermore, after crushing and pulverizing, classification is required. During the classification process, the airflow can cause some graphite particles to suspend, further exacerbating the spread of dust.

[0004] Dust issues have a number of negative impacts on the production of graphite anode materials. First, dust severely pollutes the production environment, affecting the health of operators. Long-term exposure can cause occupational hazards such as respiratory diseases, and can also damage the surrounding ecological environment. Second, large amounts of dust accumulate in the air. When reaching a certain concentration, it poses an explosion risk, seriously threatening production safety. Utility Model Content

[0005] In view of this, the utility model provides a graphite negative electrode material preparation system to solve the problem of dust diffusion in the crushing and pulverizing process of the graphite negative electrode material.

[0006] The utility model provides a graphite negative electrode material preparation system, comprising: a powder making module, which is provided with a powder making device; a grading module, which is provided with a grading device, wherein the inlet of the grading device is connected to the outlet of the powder making device through a conveying pipeline; a dust removal module, which is provided with a dust removal device and a filtering device, wherein the dust removal device is provided in plurality, and the plurality of dust removal devices are respectively arranged at the outlet of the powder making device and the outlet of the grading device, and the filtering device is respectively connected to the dust removal device through a dust removal pipeline.

[0007] Through the above settings, the powder making module can efficiently make raw materials into powder particles, provide a basis for subsequent processing, ensure that the particle size of the powder particles is controllable, and improve the consistency and stability of product quality. At the same time, since the inlet of the grading equipment and the outlet of the powder making equipment are connected through a conveying pipeline, the material after powder making can directly enter the grading link, reducing material transfer losses and pollution, improving production efficiency, and can grade powder particles according to demand to meet different market needs. In addition, multiple dust removal devices are set at the outlets of the powder making equipment and the grading equipment respectively, and are connected to the filtering device through a dust removal pipeline. The dust generated during the powder making and grading process can be collected in time to avoid environmental pollution and material loss. The filtering device ensures that the exhaust gas is environmentally friendly and protects the health of operators. A good dust removal effect also helps to maintain the normal operation of the equipment and extend the service life of the equipment.

[0008] Optionally, the powder making module includes: a powder buffer bin, and the inlet of the powder buffer bin is connected to the outlet of the powder making equipment.

[0009] Through the above-mentioned setting, the powder particles produced by the pulverizing equipment can be temporarily stored in the powder buffer bin. On the one hand, it avoids the pulverizing equipment being forced to stop running due to failures in subsequent links or mismatched processing speeds, ensures the continuous and stable operation of the pulverizing equipment, and improves production efficiency; on the other hand, the powder buffer bin can play a role in regulating the material flow, and can output powder particles stably when they are needed in subsequent links, ensuring that the operation of the entire preparation system is more stable and reliable.

[0010] Optionally, the powder making module further includes: a first conveying buffer bin, the inlet of the first conveying buffer bin is provided with an external interface, and the outlet of the first conveying buffer bin is connected to the inlet of the powder making buffer bin.

[0011] Through the above-mentioned setting, external powder materials can be introduced through the external interface to meet the adjustment of powder quantity and quality under different production needs, thereby enhancing the flexibility and adaptability of production. On the other hand, when there are materials that need to be processed again in the system, they can be re-transported to the powder buffer warehouse through the first conveying buffer warehouse and enter the powder making link for reprocessing, thereby improving resource utilization and reducing waste. At the same time, this circulation structure helps to maintain the stable operation of the system and ensure that the preparation process of graphite negative electrode materials is more efficient and sustainable.

[0012] Optionally, the grading device has a first outlet and a second outlet, the first outlet is connected to the finished product packaging device, and the second outlet is connected to the inlet of the first conveying buffer warehouse.

[0013] Through the above arrangement, the first outlet is connected to the finished product packaging equipment, allowing finished products that meet the requirements to be quickly packaged, improving production continuity and finished product processing speed. The second outlet is connected to the inlet of the first conveying buffer warehouse. Materials that do not meet the grading requirements can be returned to the powder making stage through the first conveying buffer warehouse for reprocessing, avoiding material waste and improving resource utilization. This structure enables the entire preparation system to form an effective cycle, which can continuously optimize product quality and ensure that the produced graphite negative electrode materials meet high standards.

[0014] Optionally, the powder making module includes: a second conveying buffer bin, the inlet of the second conveying buffer bin is provided with an external interface, and the outlet of the second conveying buffer bin is connected to the inlet of the powder making equipment; a first feeding buffer bin, the inlet of the first feeding buffer bin is connected to the outlet of the second conveying buffer bin, and the outlet of the first feeding buffer bin is connected to the inlet of the powder making equipment.

[0015] Through this arrangement, the second conveyor buffer acts as a preliminary buffer, ensuring a continuous supply of raw materials and preventing production from being impacted by untimely external supply. The inlet of the first feeding buffer is connected to the outlet of the second conveyor buffer, which in turn is connected to the inlet of the milling equipment. This further buffers the raw materials and regulates the feed rate, allowing them to be more accurately fed into the milling equipment, ensuring the stability and consistency of the milling process, thereby improving the product quality and production efficiency of the graphite negative electrode material.

[0016] Optionally, the grading device has a first outlet and a second outlet, the first outlet is connected to the finished product packaging device, and the second outlet is connected to the inlet of the second conveying buffer warehouse.

[0017] Through the above-mentioned setting, the first outlet is connected with the finished product packaging equipment, so that the finished products can be packaged in time and efficiency can be improved; the second outlet is connected with the inlet of the second conveying buffer bin in the powder making module. Combined with its external interface and the subsequent connection structure between the first feeding buffer bin and the powder making equipment, materials that do not meet the grading requirements can enter the powder making link again, thereby improving resource utilization, forming an efficient closed loop to optimize product quality, and the external interface enhances production flexibility.

[0018] Optionally, the grading devices have at least two units connected in parallel, each of the grading devices has a first outlet and a second outlet; the inlets of multiple grading devices are connected to the outlet of the powder making device through conveying pipes, the first outlets of multiple grading devices are connected to the finished product packaging equipment, and the second outlets of multiple grading devices are connected to the powder making module through circulation pipes.

[0019] Through the above setup, the inlets of multiple grading devices are connected to the outlets of the pulverizing equipment, enabling the simultaneous processing of pulverized materials, greatly improving grading efficiency and shortening production time. The first outlets of multiple devices are connected to the finished product packaging equipment, which can quickly process finished products that meet the requirements and improve the smoothness of the production process. The second outlet is connected to the pulverizing module, which can promptly return non-compliant materials to the pulverizing process for further processing, avoiding waste of resources. The parallel grading equipment structure ensures the system's flexibility and stability in response to different production needs, and continuously and efficiently produces high-quality graphite anode materials.

[0020] Optionally, the grading equipment has at least two units connected in series, each of the grading equipment has a first outlet and a second outlet, and the second outlets of multiple grading equipment are respectively connected to the flour making modules; the first outlet of the previous grading equipment is connected to the inlet of the next grading equipment, and the first outlet of the last grading equipment is connected to the finished product packaging equipment.

[0021] Through the above configuration, each grading device has a first outlet and a second outlet. The second outlets of multiple grading devices are connected to the milling module, allowing materials that do not meet the standards after grading to be returned to the milling module for reprocessing, avoiding resource waste. The first outlet of the previous grading device is connected to the inlet of the next grading device, and the first outlet of the last grading device is connected to the finished product packaging device. This allows materials to pass through multiple grading devices in sequence for progressively finer grading, ensuring that only high-quality finished products ultimately enter the packaging stage, improving product quality and stability, while also enabling the entire preparation system to operate more efficiently.

[0022] Optionally, the dust removal module further includes an induced draft fan, which is connected to the dust removal duct.

[0023] This arrangement enhances the suction power of the dust removal system, enabling the multiple dust removal devices installed at the outlets of the pulverizing and grading equipment to more effectively collect dust. The induced draft fan rapidly transports dust along the dust removal ducts to the filtration devices for processing, preventing the spread of dust in the production environment. This ensures the health of operators, the stable operation of production equipment, and the extended service life of the equipment, while also contributing to improved product quality of graphite anode materials.

[0024] Optionally, the grading module includes: a third conveying buffer bin and a second feeding buffer bin connected in sequence, the inlet of the third conveying buffer bin is connected to the powder making module through a conveying pipe, and the outlet of the second feeding buffer bin is connected to the inlet of the grading equipment through a conveying pipe.

[0025] Through the above arrangement, the inlet of the third conveying buffer bin is connected to the powder making module via a conveying pipeline, which can receive and buffer the material from the powder making module, ensuring a continuous supply of material. The outlet of the second feeding buffer bin is connected to the inlet of the grading equipment via a conveying pipeline, which plays a role in further buffering and accurately adjusting the feeding amount, so that the material can enter the grading equipment in a stable state and in an appropriate amount, thereby ensuring the stability and consistency of the grading process and improving the grading quality and production efficiency of the graphite negative electrode material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of a specific embodiment of a graphite negative electrode material preparation system provided in an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of a second specific implementation of the graphite negative electrode material preparation system provided in an embodiment of the present utility model;

[0029] Figure 3 This is a schematic diagram of a third specific implementation of the graphite negative electrode material preparation system provided in an embodiment of the present utility model;

[0030] Figure 4 This is a schematic diagram of a fourth specific implementation of the graphite negative electrode material preparation system provided in an embodiment of the present utility model.

[0031] Description of reference numerals:

[0032] 1. Pulverizing equipment; 2. First grading equipment; 3. Second grading equipment; 4. First dust removal device; 5. Second dust removal device; 6. Third dust removal device; 7. Filtering device; 8. Pulverizing buffer bin; 9. First conveying buffer bin; 10. Second conveying buffer bin; 11. First feeding buffer bin; 12. Finished product packaging equipment; 13. Induced draft fan; 14. Third conveying buffer bin; 15. Second feeding buffer bin. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The following combination Figures 1 to 4 , describing the embodiments of the present utility model.

[0035] like Figure 1 As shown, a specific implementation of the graphite negative electrode material preparation system provided in the embodiment provided herein includes: a powder making module, a grading module and a dust removal module.

[0036] Specifically, the powder making module includes a powder making device 1, and the grading module includes a grading device. The inlet of the grading device is connected to the outlet of the powder making device 1 through a conveying pipe. The dust removal module includes a filtering device 7 and multiple dust removal devices. The multiple dust removal devices are respectively located at the outlet of the powder making device 1 and the outlet of the grading device. These dust removal devices are connected to the filtering device 7 through dust removal pipes. The entire system is rationally laid out, and each part is tightly connected. The powder making device 1 is responsible for making raw materials into powder particles. The prepared powder particles are transported to the grading device through a conveying pipe for grading treatment. The dust removal devices located at the outlets of the powder making device 1 and the grading device can promptly collect the dust generated during the production process, and transmit the dust to the filtering device 7 through the dust removal pipe for filtration and purification.

[0037] In this embodiment, the powder making device 1 of the powder making module is connected to the inlet of the grading device of the grading module through a conveying pipe. A plurality of dust removal devices are respectively arranged at the outlet of the powder making device 1 and the outlet of the grading device, and the filtering device 7 is connected to these dust removal devices through a dust removal pipe. This structural layout allows the dust generated during the process of powder making graphite negative electrode material powder making by the powder making device 1 and the process of conveying the powdered material to the grading device for grading treatment to be collected in time by the dust removal devices respectively arranged at the outlets of the powder making device 1 and the grading device. The collected dust is conveyed to the filtering device 7 through the dust removal pipe for purification treatment, thereby effectively solving the dust diffusion problem of the graphite negative electrode material in the crushing and powder making process, ensuring the cleanliness and safety of the production environment, reducing the harm of dust to the health of operators, and also helping to improve the operating stability of the equipment and the product quality of the graphite negative electrode material.

[0038] like Figure 1As shown, in the graphite negative electrode material preparation system provided in this embodiment, the powder making module includes: a powder buffer bin 8 , the inlet of the powder buffer bin 8 is connected to the outlet of the powder making equipment 1 .

[0039] Specifically, the powder buffer warehouse 8 is a funnel-shaped storage warehouse connected to the powder making equipment 1 through a conveying pipeline. The graphite negative electrode material powder particles produced by the powder making equipment 1 can be directly transported to the powder buffer warehouse 8 for temporary storage, which plays a buffering role. When the subsequent grading module and other links have a temporary lack of processing capacity, the powder buffer warehouse 8 can store a certain amount of powder particles to ensure the stable operation of the entire preparation system. At the same time, the existence of the powder buffer warehouse 8 also facilitates the centralized management and quality inspection of the powdered products, which helps to improve the overall production quality and efficiency of the graphite negative electrode material.

[0040] like Figure 1 As shown, the graphite negative electrode material preparation system provided in this embodiment, the powder making module also includes: a first conveying buffer bin 9, the inlet of the first conveying buffer bin 9 is provided with an external interface, and the outlet of the first conveying buffer bin 9 is connected to the inlet of the powder making buffer bin 8.

[0041] Specifically, the first conveyor buffer 9, because it is equipped with an external interface, can flexibly introduce external materials according to production needs, enhancing the adaptability and flexibility of the system. The connection between the first conveyor buffer 9 and the powder buffer 8 allows external materials or materials requiring further processing to be smoothly fed into the subsequent grading process of the entire preparation system, ensuring a more efficient and sustainable preparation process for graphite negative electrode materials.

[0042] The following combination Figure 3 and Figure 4 A specific implementation method for realizing recycling treatment of the graphite negative electrode material preparation system provided in this embodiment is described in detail.

[0043] like Figure 3 、 Figure 4 As shown, in the graphite negative electrode material preparation system provided in this embodiment, the grading device has a first outlet and a second outlet, the first outlet is connected to the finished product packaging device 12, and the second outlet is connected to the inlet of the first conveying buffer warehouse 9.

[0044] Specifically, the multiple grading devices each have two outlets: a first outlet and a second outlet, allowing for the proper diversion of graded materials. The first outlets are each connected to the finished product packaging device 12 to package and process materials that meet the grading requirements screened by the grading device. The second outlets are each connected to the inlet of the first conveying buffer 9 to allow residual materials that have passed through the grading device but failed to be successfully graded to re-enter the grading process through the recycling buffer for secondary grading, thereby avoiding material waste and improving resource utilization.

[0045] The following combination Figure 1 and Figure 2 Another specific implementation method for realizing recycling treatment of the graphite negative electrode material preparation system provided in this embodiment is described in detail.

[0046] like Figure 1 、 Figure 2 As shown, the graphite negative electrode material preparation system provided in this embodiment, the powder making module also includes: a second conveying buffer bin 10, the inlet of the second conveying buffer bin 10 is provided with an external interface, and the outlet of the second conveying buffer bin 10 is connected to the inlet of the powder making equipment 1; a first feeding buffer bin 11, the inlet of the first feeding buffer bin 11 is connected to the outlet of the second conveying buffer bin 10, and the outlet of the first feeding buffer bin 11 is connected to the inlet of the powder making equipment 1.

[0047] Specifically, the second conveying buffer 10 receives external materials through an external interface and then delivers the materials to the milling equipment 1. The first feeding buffer 11, located between the second conveying buffer 10 and the milling equipment 1, serves to further buffer and accurately feed the materials. The second conveying buffer 10 can initially buffer the materials, ensuring a stable supply of materials to the milling equipment 1. The provision of the first feeding buffer 11 allows for more precise control and adjustment of the materials before they enter the milling equipment 1.

[0048] like Figure 1 、 Figure 2 As shown, in the graphite negative electrode material preparation system provided in this embodiment, the grading device has a first outlet and a second outlet, the first outlet is connected to the finished product packaging device 12, and the second outlet is connected to the inlet of the second conveying buffer warehouse 10.

[0049] Specifically, the grading equipment is located after the powder making module in the entire system. After the material is processed by the powder making equipment 1, it enters the grading equipment for grading operations. The material that meets the finished product requirements flows out from the first outlet and directly enters the finished product packaging equipment 12 for packaging. The material that does not meet the grading requirements flows out from the second outlet and enters the second conveying buffer warehouse 10, whose outlet is connected to the inlet of the powder making equipment 1. The logistics that do not meet the grading requirements are crushed and pulverized again to facilitate subsequent successful grading, and the entire system forms a circulation path to ensure that the produced graphite negative electrode materials meet high standards.

[0050] The following combination Figure 1 and Figure 3 A specific implementation method of realizing the coordinated operation of multiple grading devices in the graphite negative electrode material preparation system provided in this embodiment is described in detail.

[0051] like Figure 1 、 Figure 3 As shown, the graphite negative electrode material preparation system provided in this embodiment has at least two grading devices connected in parallel, and each grading device has a first outlet and a second outlet; the inlets of multiple grading devices are connected to the outlet of the powder making device 1 through a conveying pipeline, and the first outlets of multiple grading devices are connected to the finished product packaging equipment 12, and the second outlets of multiple grading devices are connected to the powder making module through a circulation pipeline.

[0052] Specifically, the grading equipment is provided with a first grading device 2 and a second grading device 3, and the dust removal device includes a first dust removal device 4 placed at the outlet of the powder making equipment 1, a second dust removal device 5 placed at the outlet of the first grading device 2, and the third dust removal device 6 placed at the outlet of the second grading device 3. The material output by the powder making equipment 1 can enter the two parallel first grading devices 2 and second grading devices 3 through multiple conveying pipes at the same time. The material that meets the finished product requirements flows out from the first outlet of each grading device and enters the finished product packaging equipment 12 respectively. The material that does not meet the requirements flows out from the second outlet of each grading device and returns to the powder making module through the circulation pipe. The use of multiple parallel grading devices allows the materials to be graded at the same time, greatly improving the grading efficiency and shortening the production time. The first outlets of multiple grading devices are respectively connected to the finished product packaging equipment 12, which can quickly process the finished products that meet the requirements and improve the continuity of production.

[0053] The following combination Figure 2 and Figure 4 Another specific implementation method of the graphite negative electrode material preparation system provided in this embodiment to achieve the coordinated operation of multiple grading devices is described in detail.

[0054] like Figure 2 、 Figure 4 As shown, the graphite negative electrode material preparation system provided in this embodiment has at least two grading devices connected in series, each of the grading devices has a first outlet and a second outlet, and the second outlets of multiple grading devices are respectively connected to the powder making modules; the first outlet of the previous grading device is connected to the inlet of the next grading device, and the first outlet of the last grading device is connected to the finished product packaging device 12.

[0055] Specifically, in the present embodiment, the first grading device 2 and the second grading device 3 are arranged in series. The material first enters the first grading device 2. After preliminary grading, the material that meets certain requirements flows out from the first outlet and enters the second grading device 3 to continue grading, and the material that does not meet the requirements flows out from the second outlet and returns to the milling module. In this way, the material passes through the two grading devices connected in series in turn for gradually fine grading. In the last grading device, the second grading device 3, the material that meets the requirements of the finished product flows out from its first outlet and enters the finished product packaging device 12. Because a structure of multiple grading devices connected in series is adopted, the material can undergo multiple fine gradings, which improves the precision and accuracy of the grading and ensures the quality of the final product. For materials that do not meet the ideal grading standards, they can be continuously returned to the milling module through the second outlet for reprocessing, thereby improving the utilization rate of resources.

[0056] like Figure 1 As shown, in the graphite negative electrode material preparation system provided in this embodiment, the dust removal module further includes an induced draft fan 13, and the induced draft fan 13 is connected to the dust removal pipeline.

[0057] Specifically, the induced draft fan 13 generates suction on the dust removal duct, allowing the dust generated at the outlets of the pulverizing equipment 1 and the grading equipment to be promptly collected by the dust removal device. The induced draft fan 13 then transports the dust along the dust removal duct to the filtration device 7 for treatment. This allows the dust generated during the graphite anode material preparation process to be collected and transported more quickly and efficiently. This prevents the spread of dust in the production environment, ensures a clean and safe production environment, and reduces the health hazards of dust to operators.

[0058] like Figure 1 As shown, the graphite negative electrode material preparation system provided in this embodiment, the grading module includes: a third conveying buffer bin 14 and a second feeding buffer bin 15 connected in sequence, the inlet of the third conveying buffer bin 14 is connected to the powder making module through a conveying pipe, and the outlet of the second feeding buffer bin 15 is connected to the inlet of the grading equipment through a conveying pipe.

[0059] Specifically, the material produced by the powder making module first enters the third conveying buffer bin 14 for temporary storage and buffering. Then the material flows out of the third conveying buffer bin 14 and enters the second feeding buffer bin 15. After the second feeding buffer bin 15 further caches and adjusts the material, it conveys the material to the grading equipment in a suitable state and flow rate for grading, so that the material can be transported and managed more orderly before entering the grading equipment. The third conveying buffer bin 14 can receive the material from the powder making module to ensure the continuous supply of material and avoid affecting the operation of the grading equipment due to fluctuations in the powder making link. The second feeding buffer bin 15 can accurately control and deliver the material to ensure that the material enters the grading equipment in a stable state, thereby improving the accuracy and efficiency of grading.

[0060] The graphite negative electrode material preparation system provided in this embodiment is equipped with an electrical control system, an online monitoring system, and a monitoring and alarm system. Specifically, a programmable logic controller (PLC) is used to control the automatic operation of the equipment, and a human-machine interface (HMI) is used to record data and fault information. For the control of the pulverizing equipment, the speed of the feed frequency converter is dynamically adjusted by detecting relevant parameters, thereby effectively controlling the material density inside the pulverizing equipment. For the control of the grading system, on the one hand, the induced draft fan is adjusted by detecting the wind speed and air volume, and on the other hand, the feed frequency converter is adjusted when the wind speed is stable, so that the current of the grading equipment is stable, thereby improving the grading effect. In addition, the finished product packaging equipment in this system can realize automatic packaging of material discharge without dust. All pipelines are equipped with electrically controlled valves that can switch process routes to ensure stable operation of the process. The entire preparation process can be remotely controlled through the electrical control system, and an ultrafine powder filtration system is set for the tail gas to achieve an environmentally friendly and pollution-free system. This control system makes the system intelligent, efficient, and stable, greatly improving production quality and efficiency, realizing a closed-loop chain system, and being able to accurately control the particle size indicators of multi-level finished products.

[0061] Working principle:

[0062] In the graphite negative electrode material preparation system, the material first enters through the external interface of the second conveying buffer warehouse 10, passes through the first feeding buffer warehouse 11 and enters the powder making equipment 1 for powder making, and the powdered material enters the powder buffer warehouse 8 for temporary storage. The material in the powder buffer warehouse 8 enters the grading module, first passes through the third conveying buffer warehouse 14 and the second feeding buffer warehouse 15 connected in sequence for adjustment, and then enters the grading equipment. If the grading equipment is in parallel, the material that meets the requirements enters the finished product packaging equipment 12 from the first outlet of each grading equipment, and the material that does not meet the requirements returns to the powder making module through the circulation pipe from the second outlet; if it is in series, the material is graded in sequence, and finally the material that meets the requirements enters the finished product packaging equipment 12 from the first outlet of the last grading equipment, and the material that does not meet the requirements returns to the powder making module. At the same time, multiple dust removal devices arranged at the outlets of the powder making equipment 1 and the grading equipment collect dust under the action of the induced draft fan 13 and transport it to the filter device 7 for purification through the dust removal pipe, ensuring that the entire preparation process is carried out efficiently and cleanly.

[0063] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A graphite negative electrode material preparation system, characterized in that: include: A powder making module having a powder making device (1); A grading module, comprising a grading device, wherein an inlet of the grading device is connected to an outlet of the milling device (1) via a conveying pipeline; A dust removal module comprises a dust removal device and a filtering device (7), wherein the dust removal device is provided in plurality and the plurality of dust removal devices are respectively arranged at the outlet of the powder making device (1) and the outlet of the grading device, and the filtering device (7) is respectively connected to the dust removal device through a dust removal pipe.

2. The graphite negative electrode material preparation system according to claim 1, characterized in that: The powder making module comprises: a powder buffer bin (8), the inlet of the powder buffer bin (8) being in communication with the outlet of the powder making equipment (1).

3. The graphite negative electrode material preparation system according to claim 2, characterized in that: The powder making module further comprises: a first conveying buffer bin (9), the inlet of the first conveying buffer bin (9) is provided with an external interface, and the outlet of the first conveying buffer bin (9) is connected to the inlet of the powder forming buffer bin (8).

4. The graphite negative electrode material preparation system according to claim 3, characterized in that: The grading device has a first outlet and a second outlet, the first outlet is connected to the finished product packaging device (12), and the second outlet is connected to the inlet of the first conveying buffer warehouse (9).

5. The graphite negative electrode material preparation system according to claim 3, characterized in that: The milling module further comprises: a second conveying and buffering bin (10), the inlet of the second conveying and buffering bin (10) being provided with an external interface, and the outlet of the second conveying and buffering bin (10) being in communication with the inlet of the milling device (1); A first feeding buffer bin (11), wherein the inlet of the first feeding buffer bin (11) is connected to the outlet of the second conveying buffer bin (10), and the outlet of the first feeding buffer bin (11) is connected to the inlet of the flour making equipment (1).

6. The graphite negative electrode material preparation system according to claim 5, characterized in that: The grading device has a first outlet and a second outlet, the first outlet is connected to the finished product packaging device (12), and the second outlet is connected to the inlet of the second conveying buffer warehouse (10).

7. The graphite negative electrode material preparation system according to any one of claims 1 to 6, characterized in that: The grading devices include at least two grading devices connected in parallel, each of the grading devices has a first outlet and a second outlet; The inlets of the plurality of grading devices are respectively connected to the outlets of the milling device (1) through conveying pipes, the first outlets of the plurality of grading devices are respectively connected to the finished product packaging equipment (12), and the second outlets of the plurality of grading devices are respectively connected to the milling module through circulation pipes.

8. The graphite negative electrode material preparation system according to any one of claims 1 to 6, characterized in that: The grading devices have at least two connected in series, each of the grading devices has a first outlet and a second outlet, and the second outlets of the grading devices are respectively connected to the flour making modules; The first outlet of the preceding grading device is communicated with the inlet of the following grading device, and the first outlet of the last grading device is communicated with the finished product packaging device (12).

9. The graphite negative electrode material preparation system according to any one of claims 1 to 6, characterized in that: The dust removal module also has an induced draft fan (13), and the induced draft fan (13) is connected to the dust removal pipeline.

10. The graphite negative electrode material preparation system according to any one of claims 1 to 6, characterized in that: The grading module comprises: a third conveying buffer bin (14) and a second feeding buffer bin (15) which are connected in sequence, the inlet of the third conveying buffer bin (14) is connected to the powder making module through a conveying pipeline, and the outlet of the second feeding buffer bin (15) is connected to the inlet of the grading device through a conveying pipeline.

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