A pulverizing system and a pulverizing method for multi-source negative electrode raw materials

Abstract

The application relates to the technical field of negative electrode raw material preparation, and discloses a crushing system and a crushing method for multi-source negative electrode raw materials. The crushing system comprises a detection module, a feeding module, a drying module, a crushing module and a control module; the detection module is connected with the feeding module; the feeding module, the drying module and the crushing module are connected through a three-way valve; the outlet of the feeding module is connected with the inlet end of the three-way valve; the inlet of the drying module and the inlet of the crushing module are respectively connected with the two outlet ends of the three-way valve; and the outlet of the drying module is connected with the inlet of the crushing module. The detection module comprises a moisture detector which is used to obtain the moisture content of the negative electrode raw material; and the control module is used to control the opening direction of the three-way valve according to the moisture content of the negative electrode raw material obtained by the detection module. Different processes can be used to treat different materials, so that the production of multiple raw materials can be compatible.

Description

Technical Field

[0001] This invention relates to the field of anode material preparation technology, specifically to a pulverizing system and method for multi-source anode materials. Background Technology

[0002] As a core component of lithium-ion batteries, the performance of anode materials directly affects the battery's energy density, cycle life, and safety. Currently, petroleum coke-based anode materials are widely used due to their excellent electrochemical performance, while anthracite, as a low-cost and abundant carbon source, is gradually becoming an important alternative raw material for anode material precursors.

[0003] The production of anode material precursors involves several major processes, including crushing, granulation, graphitization, and finished product screening. Petroleum coke-based precursors have problems such as large lumps and excessive moisture after crushing, while anthracite itself has a low moisture content and a particle size of usually less than 10mm. This difference makes it difficult for existing production lines to be compatible with the production of multiple raw materials, limiting production flexibility and resource utilization. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of existing production lines being unable to accommodate the production of multiple raw materials in the production and pulverization process of anode material precursors, thus limiting production flexibility and resource utilization. This invention provides a pulverization system and method for anode raw materials from multiple sources. The method connects the feeding module, drying module, and pulverization module via a three-way valve. The opening direction of the three-way valve is controlled based on the moisture content of the anode raw material obtained by the detection module. This allows for different processes to be used for different materials, thus accommodating the production of multiple raw materials.

[0005] In a first aspect, the present invention provides a pulverizing system for anode raw materials from multiple sources, including a detection module, a feeding module, a drying module, a pulverizing module, and a control module; The detection module is connected to the feeding module. The feeding module, the drying module, and the pulverizing module are connected through a three-way valve. The outlet of the feeding module is connected to the inlet of the three-way valve. The inlet of the drying module and the inlet of the pulverizing module are respectively connected to the two outlets of the three-way valve. The outlet of the drying module is connected to the inlet of the pulverizing module. The detection module includes a moisture detector, which is used to obtain the moisture content of the negative electrode raw material; The control module is used to control the opening direction of the three-way valve based on the moisture content of the negative electrode raw material obtained by the detection module.

[0006] Preferably, the pulverizing module includes at least two pulverizing subsystems connected in parallel. Each pulverizing subsystem includes a storage silo, a pneumatic conveying unit, and a pulverizing unit connected in sequence. The inlet of the storage silo is connected to the outlet of the drying module, and the inlet of the storage silo is connected to the first outlet end of a three-way valve.

[0007] Preferably, the pneumatic conveying unit includes a vacuum feeder, a buffer hopper, a rotary feeder, and a Roots blower, and the pulverizing unit includes a pulverizer, a classifier, and a shaping machine.

[0008] Preferably, the feeding module includes a grab bucket crane, a buffer hopper, a vibrating feeder, a pre-crusher, a conveyor, a bucket elevator, a buffer silo, and a quantitative feeder connected in sequence, wherein the outlet of the quantitative feeder is connected to the inlet end of the three-way valve.

[0009] Preferably, the detection module further includes a particle size detection device for obtaining the particle size of the negative electrode material; The control module is also used to control the operating parameters of the pre-crusher and the pulverizing module according to the particle size of the negative electrode raw material obtained by the particle size detection device; a valve is provided at the inlet of each storage silo, and the control module is also used to control the opening and closing of each valve according to the particle size and moisture content of the negative electrode raw material, based on the correspondence between the type of negative electrode raw material and the particle size and moisture content.

[0010] Preferably, the drying module includes a dryer, a bag filter, and a centrifugal fan, wherein the inlet of the dryer is connected to the second outlet end of the three-way valve.

[0011] Secondly, the present invention provides a method for pulverizing anode raw materials from multiple sources, applied to the pulverizing system described in the first aspect of this application. The pulverizing method includes: obtaining the moisture content of the anode raw material; determining whether the moisture content of the anode raw material is greater than a preset value; if so, controlling the opening direction of the three-way valve to connect the outlet of the feeding module with the inlet of the drying module; if not, controlling the opening direction of the three-way valve to connect the outlet of the feeding module with the inlet of the pulverizing module.

[0012] Preferably, based on the total weight of the negative electrode material, the preset value is that the weight percentage of water in the negative electrode material is 3%.

[0013] Preferably, the pulverization method further includes: obtaining the particle size of the negative electrode raw material, and controlling the operating parameters of the pre-crusher and the pulverization module according to the particle size of the negative electrode raw material; Based on the particle size and moisture content of the negative electrode raw material, and according to the correspondence between the type of negative electrode raw material and its particle size and moisture content, the opening and closing of each valve is controlled.

[0014] Thirdly, the present invention provides a negative electrode material, which is obtained by pulverizing using the pulverizing method of the second aspect of this application.

[0015] The technical solution of this invention connects the feeding module, drying module, and pulverizing module via a three-way valve, with the outlet of the drying module connected to the inlet of the pulverizing module. Therefore, the opening direction of the three-way valve can be such that the feeding module and drying module are connected, while the feeding module and pulverizing module are not connected. In this case, the material flows sequentially through the feeding module, drying module, and pulverizing module. Alternatively, the opening direction of the three-way valve can be such that the feeding module and pulverizing module are connected, while the feeding module and drying module are not connected. In this case, the material flows sequentially through the feeding module and pulverizing module. Furthermore, the opening direction of the three-way valve is controlled based on the moisture content of the negative electrode raw material obtained by the detection module. This allows for different processes to be used for different materials, thus accommodating the production of multiple raw materials. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a multi-source anode raw material pulverizing system provided in an embodiment of the present invention; Figure 2 This is another structural schematic diagram of the multi-source negative electrode raw material pulverization system provided in the embodiments of the present invention.

[0017] The attached figures are labeled as follows: 1. Feeding module; 2. Drying module; 3. Crushing module; 4. Three-way valve; 11. Grab bucket crane; 12. Buffer hopper; 13. Vibrating feeder; 14. Pre-crusher; 15. Conveyor; 16. Bucket elevator; 17. Buffer silo; 18. Quantitative feeder; 21. Dryer; 22. Baghouse dust collector; 23. Centrifugal fan; 31. Storage silo; 32. Pneumatic conveying unit; 33. Crushing unit; 321. Vacuum feeder; 322. Buffer silo and rotary feeder; 323. Roots blower; 331. Crusher; 332. First cyclone dust collector; 333. First bag filter dust collector; 334. Shaping machine; 335. Classifier; 336. Second cyclone dust collector; 337. Second bag filter dust collector; 41. The inlet end of the three-way valve; 42. The first outlet end of the three-way valve; 43. The second outlet end of the three-way valve. Detailed Implementation

[0018] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0019] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0020] For example, when a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including ranges “1 to 4”, “1 to 3”, “1 to 2”, “1 to 2 and 4 to 5”, “1 to 3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range. In this specification and claims, range definitions may be combined and / or interchanged, unless otherwise stated, these ranges include all sub-ranges contained therein.

[0021] In a first aspect, embodiments of the present invention provide a pulverizing system for multi-source negative electrode raw materials, including a detection module, a feeding module 1, a drying module 2, a pulverizing module 3, and a control module; wherein, the detection module is connected to the feeding module 1, the feeding module 1, the drying module 2, and the pulverizing module 3 are connected via a three-way valve, and the outlet of the feeding module 1 is connected to the inlet end 41 of the three-way valve, the inlet of the drying module 2 and the inlet of the pulverizing module 3 are respectively connected to the two outlet ends of the three-way valve, and the outlet of the drying module 2 is connected to the inlet of the pulverizing module 3; the detection module includes a moisture detector, which is used to obtain the moisture content of the negative electrode raw materials; the control module is used to control the opening direction of the three-way valve according to the moisture content of the negative electrode raw materials obtained by the detection module.

[0022] In this invention, the feeding module 1 is used to supply negative electrode raw materials. Generally speaking, the feeding module 1 is provided with at least one inlet and at least one outlet. The inlet of the feeding module 1 is connected to the inlet end 41 of the three-way valve. This means that each outlet of the feeding module 1 is connected to the inlet end 41 of the three-way valve.

[0023] In this invention, the drying module 2 is used to dry the negative electrode raw material. Generally speaking, the drying module 2 is provided with at least one inlet and at least one outlet. Each inlet of the drying module 2 is connected to the same outlet end of a three-way valve, and each inlet of the drying module 2 is connected to the inlet of the crushing module 3.

[0024] In this invention, the crushing module 3 is used to crush the negative electrode raw material. Generally speaking, the crushing module 3 is provided with at least one inlet and at least one outlet. Each inlet of the crushing module 3 is connected to the same outlet end of the three-way valve. At the same time, each inlet of the crushing module 3 is connected to the outlet of the drying module 2.

[0025] In a specific implementation, the moisture detector can be an online moisture tester.

[0026] In a specific implementation, the control module may be a controller that is electrically connected to the detection module, the feeding module 1, the drying module 2, and the crushing module 3, respectively.

[0027] The feeding module 1, drying module 2, and crushing module 3 are connected via a three-way valve, with the outlet of the drying module 2 connected to the inlet of the crushing module 3. Therefore, the three-way valve can be opened in a direction where feeding module 1 and drying module 2 are connected, but feeding module 1 and crushing module 3 are not connected. In this case, the material flows sequentially through feeding module 1, drying module 2, and crushing module 3. Alternatively, the three-way valve can be opened in a direction where feeding module 1 and crushing module 3 are connected, but feeding module 1 and drying module 2 are not connected. In this case, the material flows sequentially through feeding module 1 and crushing module 3. In this invention, the opening direction of the three-way valve is controlled based on the moisture content of the negative electrode raw material obtained by the detection module. This allows for different processes to be used for different materials, thus accommodating the production of multiple raw materials.

[0028] In some embodiments, the feeding module 1 includes a grab bucket crane 11, a buffer hopper 12, a vibrating feeder 13, a pre-crusher 14, a conveyor 15, a bucket elevator 16, a buffer silo 17, and a quantitative feeder 18 connected in sequence. The outlet of the quantitative feeder 18 is connected to the inlet end 41 of the three-way valve. The grab bucket crane 11 grabs and transports raw materials, conveying the negative electrode material from the storage area to the buffer hopper 12. The buffer hopper 12 receives the negative electrode material transported by the grab bucket crane 11. The vibrating feeder 13 evenly conveys the negative electrode material from the buffer hopper 12 to the pre-crusher 14. The pre-crusher 14 pre-crushes the negative electrode material to ensure its particle size meets the requirements of subsequent processing (such as the feeding requirements of the dryer 21), reduces the energy consumption of the subsequent crushing module 3, and improves the crushing consistency and uniformity of the final crushing module 3. For example, when the negative electrode raw material is raw petroleum coke, the incoming particle size is greater than 50mm, and the pre-crusher 14 crushes the material. When the negative electrode raw material is anthracite, the incoming particle size is about 10mm, and the pre-crusher 14 crushes the material, resulting in a particle size of less than 5mm. When the incoming particle size is different, the operating parameters of the pre-crusher 14 can be controlled by a controller to pre-crush raw materials of different particle sizes using different power levels. After crushing, the material is conveyed by conveyor 15 to bucket elevator 16, which vertically lifts the material to a buffer silo 17. The buffer silo 17 temporarily stores the material, serving to buffer and regulate the production rhythm. Finally, the amount of material entering the three-way valve is precisely controlled by a quantitative feeder 18 to ensure the stability of the production process and the consistency of product quality.

[0029] In some embodiments, the drying module 2 includes a dryer 21, a bag filter 22, and a centrifugal fan 23, wherein the inlet of the dryer 21 is connected to the second outlet end 43 of the three-way valve. The bag filter 22 and the centrifugal fan 23 are connected to the dryer 21, and the outlet of the dryer 21 is connected to the pulverizing module 3.

[0030] In some embodiments, the pulverizing module 3 includes at least two pulverizing subsystems connected in parallel. Each pulverizing subsystem includes a storage silo, a pneumatic conveying unit 32, and a pulverizing unit 33 connected in sequence. The inlet of the storage silo is connected to the outlet of the drying module 2, and the inlet of the storage silo is connected to the first outlet end 42 of a three-way valve. The parallel pulverizing subsystems are equipped with storage silos 31, allowing for separate storage of different raw materials. This facilitates switching between multiple raw materials and avoids the cumbersome silo washing operation when switching materials, significantly improving workshop operating efficiency. In a specific embodiment, the storage capacity of the storage silos can be set to allow the pulverizing unit 33 to operate for more than 24 hours. Each pulverizing subsystem is equipped with an independent pneumatic conveying system, allowing for independent material conveying and pulverizing. This enables the simultaneous production of multiple types of materials, meeting the diverse product characteristics of negative electrode raw materials.

[0031] For example, such as Figure 1 As shown, this embodiment of the invention employs three parallel crushing subsystems. Each crushing subsystem includes a storage hopper 31, a pneumatic conveying unit 32, and a crushing unit 33 connected in sequence. Specifically, the pneumatic conveying unit 32 includes a vacuum feeder 321, a buffer hopper, a rotary feeder 322, and a Roots blower 323, wherein the vacuum feeder 321 is connected to the Roots blower 323. The crushing unit 33 includes a crusher 331, a first cyclone dust collector 332, a first bag filter dust collector 333, a shaping machine 334, a classifier 335, a second cyclone dust collector 336, and a second bag filter dust collector 337. The material entering the crushing subsystem, under the action of the Roots blower 323, sequentially enters the vacuum feeder 321, the buffer hopper, and the rotary feeder 322, and then enters the crusher 331 for crushing. After that, it passes through the first cyclone dust collector 332 and the first bag dust collector 333 for dust removal. Then it enters the shaping machine 334, which processes the multi-sharp-angled irregular micro-powder particles into uniform potato-shaped and spherical shapes, improving the material's vibration and compaction density and reducing its specific surface area. Subsequently, it enters the classifier 335 to classify the product according to particle size through sieving. Finally, the product is passed through the second cyclone dust collector 336 and the second bag dust collector 337 for further dust removal.

[0032] In some embodiments, the detection module further includes a particle size detection device for obtaining the particle size of the negative electrode material; the control module is also used to control the operating parameters of the pre-crusher 14 and the pulverizing module 3 according to the particle size of the negative electrode material obtained by the particle size detection device; a valve is provided at the inlet of each storage hopper, and the control module is also used to control the opening and closing of each valve according to the particle size and moisture content of the negative electrode material, based on the correspondence between the type of negative electrode material and the particle size and moisture content.

[0033] In a specific implementation, the particle size detection device can be an online infrared particle size analyzer, and both the online infrared particle size analyzer and the online moisture analyzer can be installed in the buffer hopper.

[0034] For example, in this embodiment of the invention, the operating parameters of the pre-crusher 14 and the crushing module 3 can refer to the operating power. The higher the operating power, the greater the crushing effect of the pre-crusher and the crushing module 3 on the material. The particle size of the initial feed negative electrode material is obtained by the particle size detection device in the detection module. This particle size can be the average particle size. For example, when the negative electrode material is raw petroleum coke, the incoming particle size is greater than 50 mm. In this case, the control module can be used to control the power of the pre-crusher 14 to be high power and control the operating power of the crusher in the crushing module 3 to be high power. When the negative electrode material is anthracite, the incoming particle size is about 10 mm. In this case, the control module can be used to control the power of the pre-crusher 14 to be low power and control the operating power of the crusher in the crushing module 3 to be low power. The control module can control the operating parameters of the pre-crusher 14 and the crushing module 3 based on the correspondence between the incoming particle size of the negative electrode material and the operating parameters of the pre-crusher 14 and the crushing module 3. This correspondence can be described as follows: the incoming particle size of the negative electrode material is positively correlated with the operating power of the pre-crusher 14 and the crushing module 3. Here, "high power" and "low power" are relative terms and can be adjusted according to actual conditions.

[0035] For example, when multiple parallel crushing subsystems are set up in the crushing module 3, the particle size of the initial feed negative electrode material is obtained by the particle size detection device in the detection module, and the moisture content of the negative electrode material is obtained by the moisture detector in the detection module. Based on the correspondence between the particle size and moisture content of the negative electrode material and the type of negative electrode material, it can be determined whether the raw material being processed is the same negative electrode material. It is understood that a negative electrode material usually has a corresponding moisture content and particle size. For example, when the negative electrode material is raw petroleum coke, the incoming particle size is greater than 50 mm, and the weight percentage of water in the negative electrode material is greater than 3% by weight. When the negative electrode material is anthracite, the incoming particle size is about 10 mm, and the weight percentage of water in the negative electrode material is less than 3% by weight. Thus, the obtained particle size and moisture content of the negative electrode material are recorded, and negative electrode materials with the same particle size and the same moisture content are fed into the storage hopper of the same crushing module 3 by controlling the valve at the inlet of the storage hopper. For example, when the incoming materials are detected to have a particle size greater than 50mm and a water weight percentage greater than 3% in the negative electrode raw material, the first storage silo can be opened, while the second and third storage silos can be closed. However, when the incoming materials are detected to have a particle size of approximately 10mm and a water weight percentage less than 3% in the negative electrode raw material, the first storage silo can be closed, the second storage silo opened, and the third storage silo closed. This separate storage of different raw materials facilitates switching between various materials and avoids the cumbersome silo washing operation during material switching, significantly improving workshop operating efficiency.

[0036] Secondly, the present invention provides a method for pulverizing anode raw materials from multiple sources, applied to the pulverizing system described in the first aspect of this application. The pulverizing method includes: obtaining the moisture content of the anode raw materials; determining whether the moisture content of the anode raw materials is greater than a preset value; if so, controlling the opening direction of the three-way valve to connect the outlet of the feeding module 1 with the inlet of the drying module 2; if not, controlling the opening direction of the three-way valve to connect the outlet of the feeding module 1 with the inlet of the pulverizing module 3.

[0037] Therefore, when the moisture content of the negative electrode raw material is greater than the preset value, the three-way valve can be opened to connect feeding module 1 and drying module 2, while disconnecting feeding module 1 and crushing module 3. In this case, the material flows sequentially through feeding module 1, drying module 2, and crushing module 3. When the moisture content of the negative electrode raw material is less than the preset value, the three-way valve can be opened to connect feeding module 1 and crushing module 3, while disconnecting feeding module 1 and drying module 2. In this case, the material flows sequentially through feeding module 1 and crushing module 3. This allows different processes to be used for different materials, thus accommodating the production of various raw materials.

[0038] In some implementations, the preset value is that the water content in the negative electrode material is 3% by weight, based on the total weight of the negative electrode material.

[0039] In some embodiments, the pulverization method further includes: obtaining the particle size of the negative electrode raw material, and controlling the operating parameters of the pre-crusher 14 and the pulverization module 3 according to the particle size of the negative electrode raw material; Based on the particle size and moisture content of the negative electrode raw material, and according to the correspondence between the type of negative electrode raw material and its particle size and moisture content, the opening and closing of each valve is controlled.

[0040] For example, in this embodiment of the invention, the operating parameters of the pre-crusher 14 and the crushing module 3 can refer to the operating power. The higher the operating power, the greater the crushing effect of the pre-crusher and the crushing module 3 on the material. The particle size of the initial feed negative electrode material is obtained; this particle size can be the average particle size. The operating parameters of the pre-crusher 14 and the crushing module 3 can be controlled based on the correspondence between the feed particle size of the negative electrode material and the operating parameters of the pre-crusher 14 and the crushing module 3. The correspondence between the feed particle size of the negative electrode material and the operating parameters of the pre-crusher 14 and the crushing module 3 can be: the feed particle size of the negative electrode material is positively correlated with the operating power of the pre-crusher 14 and the crushing module 3.

[0041] For example, based on the particle size and moisture content of the negative electrode raw material and the corresponding relationship between the two, it can be determined whether the raw materials being processed are the same type of negative electrode raw material. It is understood that a negative electrode raw material typically has a corresponding moisture content and particle size. Therefore, by recording the obtained particle size and moisture content of the negative electrode raw material, and controlling the valve at the inlet of the storage hopper, negative electrode raw materials with the same particle size and moisture content are fed into the same storage hopper of the crushing module 3. For example, when the incoming materials are detected to have a particle size greater than 50mm and a water weight percentage greater than 3% by weight, the first storage hopper can be opened, and the second and third storage hoppers can be closed. However, when the incoming materials are detected to have a particle size of approximately 10mm and a water weight percentage less than 3% by weight, the first storage hopper can be closed, the second storage hopper opened, and the third storage hopper closed. Thus, different raw materials are stored separately, facilitating switching between multiple raw materials and avoiding the cumbersome hopper washing operation when switching raw materials, significantly improving workshop operating efficiency.

[0042] Those skilled in the art will understand that some steps or systems in the methods disclosed above can be implemented as software, firmware, hardware, or suitable combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0043] Thirdly, embodiments of the present invention provide a negative electrode raw material, which is obtained by pulverizing using the pulverization method of the second aspect of this application.

[0044] It should be noted that any reference signs placed between parentheses in the claims should not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0045] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A pulverizing system for multi-source negative electrode raw materials, characterized in that, It includes a detection module, a feeding module (1), a drying module (2), a crushing module (3), and a control module; The detection module is connected to the feeding module (1), the feeding module (1), the drying module (2) and the crushing module (3) are connected by a three-way valve, and the outlet of the feeding module (1) is connected to the inlet end (41) of the three-way valve. The inlet of the drying module (2) and the inlet of the crushing module (3) are respectively connected to the two outlet ends of the three-way valve, and the outlet of the drying module (2) is connected to the inlet of the crushing module (3). The detection module includes a moisture detector, which is used to obtain the moisture content of the negative electrode raw material; The control module is used to control the opening direction of the three-way valve based on the moisture content of the negative electrode raw material obtained by the detection module. The crushing module (3) includes at least two crushing subsystems connected in parallel. Each crushing subsystem includes a storage silo, a pneumatic conveying unit (32), and a crushing unit (33) connected in sequence. The inlet of the storage silo is connected to the outlet of the drying module (2), and the inlet of the storage silo is connected to the first outlet end (42) of the three-way valve. The feeding module (1) includes a grab bucket crane (11), a buffer hopper (12), a vibrating feeder (13), a pre-crusher (14), a conveyor (15), a bucket elevator (16), a buffer silo (17), and a quantitative feeder (18) connected in sequence, wherein the outlet of the quantitative feeder (18) is connected to the inlet end (41) of the three-way valve; The detection module also includes a particle size detection device for obtaining the particle size of the negative electrode material; The control module is also used to control the operating parameters of the pre-crusher (14) and the crushing module (3) according to the particle size of the negative electrode raw material obtained by the particle size detection device; a valve is set at the inlet of each storage bin, and the control module is also used to control the opening and closing of each valve according to the particle size and moisture content of the negative electrode raw material, based on the correspondence between the type of negative electrode raw material and the particle size and moisture content; The drying module (2) includes a dryer (21), a bag filter (22) and a centrifugal fan (23), wherein the inlet of the dryer (21) is connected to the second outlet end (43) of the three-way valve.

2. The pulverizing system according to claim 1, characterized in that, The pneumatic conveying unit includes a vacuum feeder (321), a buffer hopper and a rotary feeder (322), and a Roots blower (323); and / or, The pulverizing unit includes a pulverizer (331), a shaping machine (334), and a classifier (335).

3. A method for pulverizing multi-source negative electrode raw materials, characterized in that, Applied to the pulverizing system of claim 1 or 2, the pulverizing method includes: Obtain the moisture content of the negative electrode raw material, and determine whether the moisture content of the negative electrode raw material is greater than a preset value. If so, control the opening direction of the three-way valve to connect the outlet of the feeding module (1) with the inlet of the drying module (2). If not, control the opening direction of the three-way valve to connect the outlet of the feeding module (1) with the inlet of the crushing module (3).

4. The pulverizing method according to claim 3, characterized in that, Based on the total weight of the negative electrode material, the preset value is that the weight ratio of water in the negative electrode material is 3%.

5. The pulverizing method according to claim 3, characterized in that, The pulverization method further includes: Obtain the particle size of the negative electrode raw material, and control the operating parameters of the pre-crusher (14) and the crushing module (3) according to the particle size of the negative electrode raw material; Based on the particle size and moisture content of the negative electrode material, and according to the correspondence between the type of negative electrode material and its particle size and moisture content, the opening and closing of each valve is controlled.

6. A negative electrode material, characterized in that, It is obtained by pulverizing by any one of the pulverizing methods of claims 3-5.

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