Preparation method and device of coal-based lithium ion battery negative electrode material precursor and application of coal-based lithium ion battery negative electrode material precursor

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a preparation method and device and application of a coal-based lithium ion battery negative electrode material precursor, the device comprises an extruder, a feeding shell, a feeding port, a control panel and a preparation assembly, the feeding shell is communicated with the extruder, the feeding port is communicated with one side of the feeding shell, and the control panel is connected with the preparation assembly; the control panel is arranged on one side of the extruder; the preparation assembly comprises an inclined plate, a compression roller and a crushing unit, carbonized coal is put into an extruder through a feed port for extrusion and granulation, and particles are detected at the same time; unqualified particles are put into the feeding shell and are stacked on the inclined plate; the compression roller is started to extrude particles and destroy the structure of the particles, then the crushing unit crushes the particles, and the particles are put into the extruder again, so that the particles which are put again are extruded and crushed, the structural form of the particles is thoroughly destroyed, the particles are fully mixed with raw materials in the extruder, and the uniformity of subsequent particles is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a preparation method, a device and an application of a precursor of a negative electrode material for a coal-based lithium ion battery. Background Art

[0002] Currently in the production of lithium-ion batteries, the most commonly used battery negative electrode material is graphitized carbon material. Therefore, when making the precursor of the negative electrode material of lithium-ion batteries, artificial graphite is usually used. The coal is pre-treated by crushing and screening, and then carbonized and activated, and then put into the extruder for granulation to obtain the precursor.

[0003] However, in the aforementioned prior art, when the precursor is granulated by an extruder, particles of unqualified size usually appear. Therefore, in order to save resources, the particles need to be put back into the extruder for granulation. However, the waste material has been extruded once and cannot be fully mixed with other raw materials when it is put back into the extruder, thereby destroying the uniformity of the overall particles and ultimately affecting the performance of the lithium-ion battery. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation method, device and application of a coal-based lithium-ion battery negative electrode material precursor, so as to solve the problem that in the prior art, when the precursor is granulated by an extruder, particles of unqualified size usually appear. Therefore, in order to save resources, the particles need to be put back into the extruder for granulation. However, the waste material has been extruded once and cannot be fully mixed with other raw materials when it is put back into the extruder, thereby destroying the uniformity of the overall particles and ultimately affecting the performance of the lithium-ion battery.

[0005] To achieve the above-mentioned object, the present invention provides a preparation device for a precursor of a negative electrode material of a coal-based lithium-ion battery, comprising an extruder, a feed housing, a feed port, a control panel and a preparation component, wherein the feed housing is connected to the extruder, the feed port is connected to one side of the feed housing, and the control panel is arranged on one side of the extruder;

[0006] The preparation assembly includes an inclined plate, a pressure roller and a crushing unit. The inclined plate is fixedly connected to the feed shell and is located inside the feed shell. The pressure roller is rotatably connected to the feed shell and is located above the inclined plate. The crushing unit is located below the inclined plate.

[0007] Among them, the preparation component also includes a plurality of heating wires and a first motor, the plurality of heating wires are arranged in sequence inside the inclined plate, the first motor is fixedly connected to the feed shell and is located on one side of the feed shell, and the output end of the first motor passes through the feed shell and is fixedly connected to the pressure roller.

[0008] Among them, the crushing unit includes a guide plate, a second motor and a plurality of blades, the guide plate is fixedly connected to the inclined plate and is located below the inclined plate, the second motor is fixedly connected to the feed shell and is located on one side of the feed shell, the output end of the second motor passes through the feed shell and is rotatably connected to the inner side wall of the feed shell, and the plurality of blades are distributed around the output end of the second motor in sequence.

[0009] Wherein, the preparation assembly further comprises a granulation unit, and the granulation unit is arranged at one end of the extruder;

[0010] The granulation unit includes a bracket, a first cylinder, a cutting knife, a second cylinder, a support plate and a granulation mold. The bracket is mounted on one end of the extruder, the first cylinder and the second cylinder are both arranged on the inner top wall of the bracket, the output end of the first cylinder is fixedly connected to the cutting knife, the output end of the second cylinder is fixedly connected to the support plate, and the granulation mold is detachably connected to the bottom of the support plate.

[0011] Wherein, the preparation assembly further comprises a conveying unit, and the conveying unit is arranged on the bracket;

[0012] The conveying unit includes two first electric slide rails, two first sliders, a third motor, a threaded rod, a conveying plate and two guide rods. The two first electric slide rails are symmetrically arranged inside the bracket. The two first sliders are respectively slidably connected to the corresponding first electric slide rails. The third motor is arranged on the corresponding first slider. One end of the threaded rod is fixedly connected to the output end of the third motor, and the other end of the threaded rod is rotatably connected to the corresponding first slider. The conveying plate has a threaded hole, and the threaded rod and the threaded hole are adapted to each other. The two guide rods both pass through the conveying plate and are symmetrically distributed on both sides of the threaded rod.

[0013] Wherein, the preparation assembly further comprises a material pushing unit, and the material pushing unit is arranged below the bracket;

[0014] The pushing unit includes a third cylinder, a pushing plate, two limit plates and a lower shovel plate. The third cylinder is arranged on the inner top wall of the bracket, and the output end of the third cylinder is fixedly connected to the pushing plate. The two limit plates are symmetrically arranged on both sides of the pushing plate, and the lower shovel plate is arranged below the pushing plate.

[0015] Among them, the preparation component also includes a transfer unit, which includes a second electric slide rail, a second slider, two fourth cylinders, a support block, a fifth cylinder, a material frame, a collecting box and a filtering mechanism. The second electric slide rail is arranged on one side of the extruder, the second slider is slidably connected to the second electric slide rail, the two fourth cylinders are both arranged above the second slider, the support block is fixedly connected to the output ends of the two fourth cylinders, the fifth cylinder is arranged on one side of the support block, the output end of the fifth cylinder is fixedly connected to the material frame, the collecting box is placed below the material frame, and the filtering mechanism is arranged on the material frame.

[0016] Among them, the filtering mechanism includes a self-locking motor, a filter rotating plate, a plurality of industrial cameras and two heating plates. The self-locking motor is fixedly connected to the material frame and is located on one side of the material frame. The filter rotating plate is rotatably connected to the material frame and is located inside the material frame. The output end of the self-locking motor passes through the material frame and is fixedly connected to the filter rotating plate. The plurality of industrial cameras are sequentially arranged on the inner side wall of the material frame, and the two heating plates are symmetrically arranged on the inner side wall of the material frame.

[0017] The present invention also provides a method for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery, using the above-mentioned device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery, comprising the following steps:

[0018] The coal is crushed and screened to remove impurities;

[0019] The coal is subjected to high temperature carbonization treatment to further remove impurities and obtain carbonized coal;

[0020] Activate the carbonized coal to increase its specific surface area and porosity;

[0021] Putting the carbonized coal into the extruder through the feed port, extruding and granulating, and testing the particles at the same time;

[0022] Put unqualified particles into the feed housing and stack them on the inclined plate;

[0023] The pressing roller is started to squeeze the particles to destroy their structure, and then the crushing unit crushes the particles to put them back into the extruder.

[0024] The present invention also provides an application of a coal-based lithium-ion battery negative electrode material precursor, using the above-mentioned coal-based lithium-ion battery negative electrode material precursor preparation device and applying the above-mentioned coal-based lithium-ion battery negative electrode material precursor preparation method to the preparation of coal-based lithium-ion battery negative electrode material precursor.

[0025] The invention discloses a method, device and application for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery, comprising the steps of crushing and screening the coal to remove impurities; subjecting the coal to a high-temperature carbonization treatment to further remove impurities to obtain carbonized coal; subjecting the carbonized coal to an activation treatment to increase its specific surface area and porosity; placing the carbonized coal into the extruder through the feed port, extruding and granulating the coal, and testing the particles thereof; placing unqualified particles into the feed shell to be stacked on the inclined plate; starting the pressure roller to extrude the particles to destroy their structure, and then subjecting the particles to pulverization by the pulverization unit to re-introduce the particles into the extruder; and through the above-mentioned structural arrangement, the re-introduced particles are extruded and then pulverized to completely destroy their structural morphology, so that the particles are fully mixed with the raw materials in the extruder to ensure the uniformity of the subsequent particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is the overall rear view of the present invention.

[0029] Figure 3 It is a cross-sectional view of the whole of the present invention.

[0030] Figure 4 The present invention Figure 3 AA line section view.

[0031] Figure 5 The present invention Figure 4 BB line cross-sectional view.

[0032] Figure 6 The present invention Figure 3 Enlarged view of the local structure at location C.

[0033] Figure 7 The present invention Figure 4 Enlarged view of the local structure at D.

[0034] Figure 8 It is a flow chart of the steps of the method for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery of the present invention.

[0035] 1-extruder, 2-feed housing, 3-feed port, 4-control panel, 5-inclined plate, 6-pressure roller, 7-electric heating wire, 8-first motor, 9-guide plate, 10-second motor, 11-blade, 12-bracket, 13-first cylinder, 14-cutting knife, 15-second cylinder, 16-support plate, 17-granulation mold, 18-first electric slide rail, 19-first slider, 20-third motor, 21-threaded rod, 22-conveyor plate, 23-guide rod, 24-threaded hole, 25-third cylinder, 26-push plate, 27-limiting plate, 28-lower shovel plate, 29-second electric slide rail, 30-second slider, 31-fourth cylinder, 32-support block, 33-fifth cylinder, 34-material frame, 35-collection box, 36-self-locking motor, 37-filter rotating plate, 38-industrial camera, 39-heating plate. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0037] See also Figures 1 to 7 The present invention provides a preparation device for a precursor of a negative electrode material for a coal-based lithium-ion battery, comprising an extruder 1, a feed housing 2, a feed port 3, a control panel 4 and a preparation component, wherein the preparation component comprises an inclined plate 5, a pressure roller 6 and a crushing unit, wherein the preparation component further comprises a plurality of electric heating wires 7 and a first motor 8, wherein the crushing unit comprises a guide plate 9, a second motor 10 and a plurality of blades 11, wherein the preparation component further comprises a granulation unit, wherein the granulation unit comprises a bracket 12, a first cylinder 13, a cutting knife 14, a second cylinder 15, a support plate 16 and a granulation mold 17, wherein the preparation component further comprises a conveying unit, wherein the conveying unit comprises two The preparation component further comprises a first electric slide rail 18, two first sliders 19, a third motor 20, a threaded rod 21, a conveying plate 22 and two guide rods 23. The preparation component also comprises a pushing unit, which comprises a third cylinder 25, a pushing plate 26, two limit plates 27 and a lower shovel plate 28. The preparation component also comprises a transfer unit, which comprises a second electric slide rail 29, a second slider 30, two fourth cylinders 31, a support block 32, a fifth cylinder 33, a material frame 34, a collecting box 35 and a filtering mechanism. The filtering mechanism comprises a self-locking motor 36, a filtering rotating plate 37, multiple industrial cameras 38 and two heating plates 39.

[0038] The invention comprises an extruder 1, a feed shell 2, a feed port 3 and a control panel 4, wherein the feed shell 2 is connected to the extruder 1, the feed port 3 is connected to one side of the feed shell 2, the control panel 4 is arranged on one side of the extruder 1, the inclined plate 5 is fixedly connected to the feed shell 2 and is located inside the feed shell 2, the pressing roller 6 is rotatably connected to the feed shell 2 and is located above the inclined plate 5, and the crushing unit is located below the inclined plate 5. The coal is crushed and screened to remove impurities; the coal is subjected to high-temperature carbonization treatment to further remove impurities to obtain carbonized coal; the carbonized coal is activated to increase its specific surface area and porosity; the carbonized coal is placed in the extruder 1 through the feed port 3, extruded and granulated, and its particles are tested at the same time; unqualified particles are placed in the feed shell 2 and are stacked on the inclined plate 5; the pressing roller 6 is started to squeeze the particles to destroy their structure, and then the crushing unit crushes the particles so that they are put back into the extruder 1.

[0039] Secondly, a plurality of the electric heating wires 7 are sequentially arranged inside the inclined plate 5, the first motor 8 is fixedly connected to the feed housing 2 and is located at one side of the feed housing 2, and the output end of the first motor 8 penetrates the feed housing 2 and is fixedly connected to the pressing roller 6. When the electric heating wire 7 is started, the inclined plate 5 can be heated and dried to heat the accumulated waste particles to avoid excessive moisture causing high viscosity and being unable to be crushed. When the first motor 8 is started, the pressing roller 6 is driven to rotate to crush the waste particles, and then the waste particles continue to fall downward.

[0040] At the same time, the guide plate 9 is fixedly connected to the inclined plate 5 and is located below the inclined plate 5. The second motor 10 is fixedly connected to the feed housing 2 and is located at one side of the feed housing 2. The output end of the second motor 10 passes through the feed housing 2 and is rotatably connected to the inner side wall of the feed housing 2. The plurality of blades 11 are sequentially distributed around the output end of the second motor 10. The guide plate 9 limits the falling particles so that they fall near the blades 11. The second motor 10 is started to drive the blades 11 to rotate and cut and crush the particles.

[0041] In addition, the granulation unit is arranged at one end of the extruder 1; the bracket 12 is mounted at one end of the extruder 1, the first cylinder 13 and the second cylinder 15 are both arranged on the inner top wall of the bracket 12, the output end of the first cylinder 13 is fixedly connected to the cutting knife 14, the output end of the second cylinder 15 is fixedly connected to the support plate 16, and the granulation die 17 is detachably connected to the lower part of the support plate 16. The first cylinder 13 is started to drive the cutting knife 14 to move downward, cut the extruded precursor into particles, and drop them on the conveying plate 22; after extrusion, the second cylinder 15 can be moved downward to drive the granulation die 17 to move downward, and granulation can be completed through extrusion molding.

[0042] Then, the conveying unit is arranged on the bracket 12; the two first electric slide rails 18 are symmetrically arranged inside the bracket 12, the two first sliders 19 are respectively slidably connected with the corresponding first electric slide rails 18, the third motor 20 is arranged on the corresponding first slider 19, one end of the threaded rod 21 is fixedly connected with the output end of the third motor 20, the other end of the threaded rod 21 is rotatably connected with the corresponding first slider 19, the conveying plate 22 has a threaded hole 24, the threaded rod 21 and the threaded hole 24 are mutually adapted, and the two guide rods 23 both penetrate the conveying plate 22 and are symmetrically distributed on both sides of the threaded rod 21. When the first electric slide rail 18 is started, the first slider 19 is driven to move, and the conveying plate 22 is driven to move forward and backward, so that the conveying plate 22 moves to the bottom of the granulation mold 17; when the third motor 20 is started, the threaded rod 21 is driven to rotate, and cooperates with the threaded hole 24, and drives the conveying plate 22 to move laterally, and the guide rod 23 plays a guiding and limiting role.

[0043] Furthermore, the pushing unit is arranged below the bracket 12; the third cylinder 25 is arranged on the inner top wall of the bracket 12, the output end of the third cylinder 25 is fixedly connected to the pushing plate 26, the two limit plates 27 are symmetrically arranged on both sides of the pushing plate 26, and the lower shovel plate 28 is arranged below the pushing plate 26. The conveying plate 22 moves between the material frame 34 and the pushing plate 26, the third cylinder 25 is started, driving the pushing plate 26 to move, the lower shovel plate 28 first contacts with the particles, shovels them away from the conveying plate 22, and the limit plates 27 play a limiting role to prevent them from falling, and then push them into the material frame 34.

[0044] Again, the second electric slide rail 29 is arranged at one side of the extruder 1, the second slider 30 is slidably connected to the second electric slide rail 29, the two fourth cylinders 31 are arranged above the second slider 30, the support block 32 is fixedly connected to the output ends of the two fourth cylinders 31, the fifth cylinder 33 is arranged at one side of the support block 32, the output end of the fifth cylinder 33 is fixedly connected to the material frame 34, the collection box 35 is placed below the material frame 34, and the filtering mechanism is arranged on the material frame 34. The second electric slide rail 29 is started to drive the second slider 30 to move, and at the same time, the fourth cylinder 31 is started to drive the material frame 34 to move upward, and the fifth cylinder 33 is started to drive the material frame 34 to move horizontally. After being located above the feed housing 2, unqualified particles can be placed below; the support frame supports the fifth cylinder 33.

[0045] Finally, the self-locking motor 36 is fixedly connected to the material frame 34 and is located on one side of the material frame 34. The filter rotary plate 37 is rotatably connected to the material frame 34 and is located inside the material frame 34. The output end of the self-locking motor 36 passes through the material frame 34 and is fixedly connected to the filter rotary plate 37. The plurality of industrial cameras 38 are sequentially arranged on the inner side wall of the material frame 34, and the two heating plates 39 are symmetrically arranged on the inner side wall of the material frame 34. After the particles fall into the material frame 34, the filter rotary plate 37 first filters the particles, and then the industrial camera 38 takes a picture of the particles. Under the control of the control panel 4, the image is transmitted to the host computer for analysis and judgment to identify whether there are defects in the appearance, and then confirm that the filtered particles are unqualified particles. After moving to the top of the feed shell 2, the self-locking motor 36 is started to drive the filter rotary plate 37 to rotate and discharge the waste; in addition, the heating plate 39 can preheat the particles in the material frame 34 so that after they fall on the inclined plate 5, the moisture can be dried faster.

[0046] When using the device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery of the present embodiment, the coal is crushed and screened to remove impurities; the coal is subjected to high-temperature carbonization treatment to further remove impurities to obtain carbonized coal; the carbonized coal is activated to increase its specific surface area and porosity; the carbonized coal is placed in the extruder 1 through the feed port 3 to extrude and granulate; the first cylinder 13 is started to drive the cutting knife 14 to move downward, cut the extruded precursor into particles, and drop them onto the conveying plate 22; or after extrusion, the first electric slide rail 18 is started to drive the first slider 19 to move, driving the conveying plate 2 2 moves forward and backward, so that the conveying plate 22 moves to the bottom of the granulation mold 17, and relies on the second cylinder 15 to move downward, driving the granulation mold 17 to move downward, and completing granulation through extrusion molding; then the third motor 20 is started, driving the threaded rod 21 to rotate, cooperating with the threaded hole 24, driving the conveying plate 22 to move horizontally, and the guide rod 23 plays a guiding and limiting role; the conveying plate 22 moves to between the material frame 34 and the push plate 26 and then stops, the third cylinder 25 is started, driving the push plate 26 to move, and the lower shovel plate 28 first contacts the particles and shovels them away from the conveying plate 22, and at the same time, the limiting plate 27 plays a limiting role to prevent it from falling, and then pushes it into the material frame 34; after the particles fall into the material frame 34, the filtering rotating plate 37 first filters the particles, and then the industrial camera 38 takes pictures of the particles. After the control of the control panel 4, the graphics are transmitted to the host computer for analysis and judgment to identify whether there are defects in the appearance, and then confirm that the filtered particles are unqualified particles. The second electric slide rail 29 is started to drive the second slide block 30 to move, and at the same time the fourth cylinder 31 is started to drive the material frame 34 to move up, and the fifth cylinder 33 is started to drive After the material frame 34 is moved horizontally and is located above the feed shell 2, the self-locking motor 36 is started to drive the filter rotary plate 37 to rotate, and unqualified particles are put into the feed shell 2 and piled on the inclined plate 5; the pressure roller 6 is started to extrude the particles to destroy their structure, and then the second motor 10 is started to drive the blade 11 to rotate, cut and crush the particles, and re-introduce them into the extruder 1. Through the above-mentioned structural setting, the re-introduced particles are extruded and crushed to completely destroy their structural morphology, so that they are fully mixed with the raw materials in the extruder 1 to ensure the uniformity of subsequent particles.

[0047] See also Figure 8 The present invention also provides a method for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery, comprising the following steps:

[0048] S1: crush and screen the coal to remove impurities;

[0049] S2: subjecting the coal to high temperature carbonization treatment to further remove impurities and obtain carbonized coal;

[0050] S3: activating the carbonized coal to increase its specific surface area and porosity;

[0051] S4: putting the carbonized coal into the extruder 1 through the feed port 3, extruding and granulating, and detecting the particles at the same time;

[0052] S5: Put unqualified particles into the feed housing 2 and stack them on the inclined plate 5;

[0053] S6: The pressing roller 6 is started to squeeze the particles to destroy their structure, and then the crushing unit crushes the particles to put them back into the extruder 1.

[0054] Among them, the coal is crushed and screened to remove impurities; the coal is subjected to high-temperature carbonization treatment to further remove impurities and obtain carbonized coal; the carbonized coal is activated to increase its specific surface area and porosity; the carbonized coal is put into the extruder 1 through the feed port 3, extruded into granules, and its particles are tested at the same time; unqualified particles are put into the feed shell 2 and piled on the inclined plate 5; the pressure roller 6 is started to extrude the particles to destroy their structure, and then the crushing unit crushes the particles and puts them back into the extruder 1.

[0055] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A preparation device for a precursor of a negative electrode material for a coal-based lithium-ion battery, comprising an extruder, a feed housing, a feed port and a control panel, wherein the feed housing is connected to the extruder, the feed port is connected to one side of the feed housing, and the control panel is arranged on one side of the extruder, characterized in that: Also included are preparation components; The preparation assembly includes an inclined plate, a pressure roller and a crushing unit. The inclined plate is fixedly connected to the feed shell and is located inside the feed shell. The pressure roller is rotatably connected to the feed shell and is located above the inclined plate. The crushing unit is located below the inclined plate.

2. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 1, characterized in that: The preparation component also includes a plurality of heating wires and a first motor. The plurality of heating wires are sequentially arranged inside the inclined plate. The first motor is fixedly connected to the feed shell and is located on one side of the feed shell. The output end of the first motor passes through the feed shell and is fixedly connected to the pressure roller.

3. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 2, characterized in that: The crushing unit includes a material guide plate, a second motor and a plurality of blades. The material guide plate is fixedly connected to the inclined plate and is located below the inclined plate. The second motor is fixedly connected to the feed shell and is located on one side of the feed shell. The output end of the second motor passes through the feed shell and is rotatably connected to the inner side wall of the feed shell. The plurality of blades are sequentially distributed around the output end of the second motor.

4. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 3, characterized in that: The preparation assembly further comprises a granulation unit, which is disposed at one end of the extruder; The granulation unit includes a bracket, a first cylinder, a cutting knife, a second cylinder, a support plate and a granulation mold. The bracket is mounted on one end of the extruder, the first cylinder and the second cylinder are both arranged on the inner top wall of the bracket, the output end of the first cylinder is fixedly connected to the cutting knife, the output end of the second cylinder is fixedly connected to the support plate, and the granulation mold is detachably connected to the bottom of the support plate.

5. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 4, characterized in that: The preparation assembly further includes a conveying unit, and the conveying unit is disposed on the bracket; The conveying unit includes two first electric slide rails, two first sliders, a third motor, a threaded rod, a conveying plate and two guide rods. The two first electric slide rails are symmetrically arranged inside the bracket. The two first sliders are respectively slidably connected to the corresponding first electric slide rails. The third motor is arranged on the corresponding first slider. One end of the threaded rod is fixedly connected to the output end of the third motor, and the other end of the threaded rod is rotatably connected to the corresponding first slider. The conveying plate has a threaded hole, and the threaded rod and the threaded hole are adapted to each other. The two guide rods both pass through the conveying plate and are symmetrically distributed on both sides of the threaded rod.

6. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 5, characterized in that: The preparation assembly further comprises a material pushing unit, and the material pushing unit is arranged below the bracket; The pushing unit includes a third cylinder, a pushing plate, two limit plates and a lower shovel plate. The third cylinder is arranged on the inner top wall of the bracket, and the output end of the third cylinder is fixedly connected to the pushing plate. The two limit plates are symmetrically arranged on both sides of the pushing plate, and the lower shovel plate is arranged below the pushing plate.

7. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 6, characterized in that: The preparation component also includes a transfer unit, which includes a second electric slide rail, a second slider, two fourth cylinders, a support block, a fifth cylinder, a material frame, a collecting box and a filtering mechanism. The second electric slide rail is arranged on one side of the extruder, the second slider is slidably connected to the second electric slide rail, the two fourth cylinders are both arranged above the second slider, the support block is fixedly connected to the output ends of the two fourth cylinders, the fifth cylinder is arranged on one side of the support block, the output end of the fifth cylinder is fixedly connected to the material frame, the collecting box is placed below the material frame, and the filtering mechanism is arranged on the material frame.

8. The device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery according to claim 7, characterized in that: The filtering mechanism includes a self-locking motor, a filter rotating plate, a plurality of industrial cameras and two heating plates. The self-locking motor is fixedly connected to the material frame and is located on one side of the material frame. The filter rotating plate is rotatably connected to the material frame and is located inside the material frame. The output end of the self-locking motor passes through the material frame and is fixedly connected to the filter rotating plate. The plurality of industrial cameras are sequentially arranged on the inner side wall of the material frame, and the two heating plates are symmetrically arranged on the inner side wall of the material frame.

9. A method for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery, using the device for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery as claimed in claim 8, characterized in that: The steps include: The coal is crushed and screened to remove impurities; The coal is subjected to high temperature carbonization treatment to further remove impurities and obtain carbonized coal; Activate the carbonized coal to increase its specific surface area and porosity; Putting the carbonized coal into the extruder through the feed port, extruding and granulating, and testing the particles at the same time; Put unqualified particles into the feed housing and stack them on the inclined plate; The pressing roller is started to squeeze the particles to destroy their structure, and then the crushing unit crushes the particles to put them back into the extruder.

10. An application of a coal-based lithium-ion battery negative electrode material precursor, characterized in that: The method for preparing a precursor of a negative electrode material for a coal-based lithium-ion battery as claimed in claim 9 is applied to the preparation of a precursor of a negative electrode material for a coal-based lithium-ion battery.

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