A lithium battery negative electrode material carbonization device and a carbonization method

Abstract

The present application relates to the technical field of negative material production, in particular to a lithium battery negative material carbonization device, which comprises a roller kiln and a replacement chamber arranged in the roller kiln, the replacement chamber comprises an inner door and an outer door, further comprising a communication piece arranged on the roller kiln, and the top and bottom of the two replacement chambers are communicated with each other through the communication piece, a gas exchange piece is arranged on the roller kiln, and the gas exchange piece is connected with the communication piece, so that the protective atmosphere in one replacement chamber can be exchanged with the gas in another replacement chamber with the inner door opened before the outer door of the one replacement chamber is opened during the operation of the device, and the oxygen content in the replacement chamber with the inner door opened can be greatly reduced through the exchange, so that the amount of protective atmosphere consumed when the gas exchange piece is used to replace the gas in the replacement chamber is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of negative electrode material production technology, specifically to a carbonization device and method for lithium battery negative electrode materials. Background Technology

[0002] The negative electrode material of lithium-ion batteries is the core component for storing and releasing lithium ions. The carbonization process is crucial in its preparation. This process involves carbonizing the organic matter in the raw material under specific temperature and atmosphere conditions to form a carbonaceous structure. Currently, roller kilns are commonly used for carbonization. The raw material enters from one side of the kiln and is moved horizontally by equidistantly arranged rollers rotating synchronously in the same direction, achieving carbonization while moving. Carbonization must be carried out under a protective atmosphere. The displacement chamber within the roller kiln, as a key structure, facilitates the conversion between air and the protective atmosphere, ensuring a smooth carbonization process. Specifically, there is usually one displacement chamber at each end of the roller kiln, equipped with two doors: an outer door separates the outside world from the displacement chamber, preventing external impurities from interfering with the protective atmosphere; an inner door separates the roller kiln from the displacement chamber, facilitating material transfer and maintaining a stable atmosphere within the kiln, ensuring successful carbonization.

[0003] However, in actual operation, when the roller kiln is in the feeding stage, the raw material of the negative electrode material to be carbonized needs to be sent into the roller kiln. At this time, the outer door of the replacement chamber at one end of the roller kiln must be opened so that the material can smoothly enter the replacement chamber and be further transferred into the roller kiln. Similarly, in the discharge stage, the carbonized negative electrode material needs to be taken out of the roller kiln. The outer door of the replacement chamber at the other end of the roller kiln also needs to be opened to ensure that the material can be smoothly output. However, during the two operations of opening the outer door during the feeding and discharging of the roller kiln, because the replacement chamber is directly connected to the outside, the protective atmosphere originally created in the replacement chamber to ensure the carbonization quality of the negative electrode material will leak to the outside without any obstruction, causing resource loss. Therefore, before closing the outer door and opening the inner door, a large amount of protective atmosphere must be filled into the replacement chamber to replace the air in it and ensure the stability of the subsequent carbonization environment. For this reason, we propose a lithium battery negative electrode material carbonization device. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a lithium battery anode material carbonization apparatus, comprising a roller kiln and a replacement chamber disposed within the roller kiln. The replacement chamber includes an inner door and an outer door, and also includes a connecting member disposed on the roller kiln. The top and bottom ends of the two replacement chambers are interconnected through the connecting member. A gas exchange member is disposed on the roller kiln and connected to the connecting member. Before the outer door of one replacement chamber is opened, the protective atmosphere inside it is exchanged with the gas in the replacement chamber whose inner door is about to be opened through the connecting member. An atmosphere replacement member is disposed on the roller kiln and connected to the connecting member. After the gas exchange is completed, the atmosphere replacement member replaces the protective atmosphere in the replacement chamber whose inner door is about to be opened, ensuring that the oxygen content in this replacement chamber does not exceed a set value.

[0005] In some embodiments, the connecting member includes a first conduit fixedly connected to the roller kiln, with both ends of the first conduit communicating with the tops of two replacement chambers respectively. A second conduit is fixedly connected to the roller kiln, with both ends of the second conduit communicating with the bottoms of two replacement chambers respectively. Gas diffusers are provided at the top and bottom of each replacement chamber, and the gas diffusers are connected to the first and second conduits for diffusing gas.

[0006] In some embodiments, the gas exchange component includes a mounting plate fixedly connected to the roller kiln. Two circular holes are symmetrically opened on the mounting plate, and a hollow tube is provided in each of the two circular holes. A through hole is also opened on the mounting plate, and the two ends of the hollow tube are connected to a conduit and a conduit through the through hole.

[0007] An installation frame is fixedly connected inside the hollow tube, and a drive motor is fixedly connected to the installation frame. Multiple fan blades are evenly fixedly connected to the output shaft of the drive motor. The two drive motors are started to make the gas exchange flow in the two replacement chambers.

[0008] In some embodiments, the atmosphere replacement component includes two through holes formed at both ends of the mounting plate, one of the two through holes being connected to a protective atmosphere supply device via a conduit, and the other two through holes being connected to a protective atmosphere treatment device via a conduit.

[0009] A circular ring is provided inside the circular hole, and the circular ring is fixedly connected to the mounting plate. Two connecting pipes are symmetrically fixedly connected to the circular ring, and the connecting pipes are conductively connected to the hollow pipe. An annular plate is rotatably connected inside the circular hole, and the inner wall of the annular plate contacts and abuts against the outer wall of the circular ring. Two docking holes are symmetrically opened on the annular plate for connecting the through hole one to the connecting pipe. An arc-shaped groove is opened on the annular plate, and the two ends are respectively connected to the two docking holes. A sealing block is fixedly connected to the circular ring, and the sealing block is slidably connected to the inner wall of the arc-shaped groove for separating the arc-shaped groove.

[0010] Furthermore, a docking groove is provided on the annular plate for docking with the first through hole. The mounting plate is provided with a rotating component connected to the two annular plates, which is used to drive the two annular plates to rotate after the gas exchange is completed, so that the protective atmosphere supply device and the protective atmosphere treatment device are connected to the displacement chamber of the inner door to be opened through the hollow tube.

[0011] In some embodiments, a one-way valve is provided in both of the docking slots. The one-way valve located in the annular plate corresponding to conduit one is used to allow gas to enter conduit one only through the docking slot after the annular plate is rotated. The one-way valve located in the annular plate corresponding to conduit two is used to allow gas to enter the hollow tube only through the docking slot after the annular plate is rotated.

[0012] In some embodiments, the rotating component includes a gear ring fixedly connected to an annular plate, two gear rings meshing, a second drive motor fixedly connected to the mounting plate, and a gear disk meshing with one gear ring fixedly connected to the output shaft of the second drive motor, and starting the second drive motor drives the two annular plates to rotate.

[0013] In some embodiments, the one-way valve includes two annular protrusions fixedly connected in the docking groove, a sealing plate is provided on one side of one annular protrusion, and a spring is provided between one side of the sealing plate and the other annular protrusion.

[0014] In some embodiments, the gas diffuser includes a horizontal conduit fixedly connected to the top and bottom of the displacement chamber. The two horizontal conduits are connected to conduit one and conduit two respectively. Multiple vertical conduits are evenly connected to the horizontal conduits, and multiple vent holes are evenly opened on the vertical conduits.

[0015] This application provides a carbonization method for a lithium battery anode material carbonization device; the lithium battery anode material carbonization device includes: S: raw material loading, loading the pre-treated anode material into a sagger, placing it at the feed end of the roller kiln, and initially closing the replacement chamber;

[0016] S: Atmosphere treatment before continuous feeding and discharging. Before opening the outer door of the feed end replacement chamber, the gas in the two replacement chambers is exchanged with an atmosphere exchanger. Then, the replacement chamber whose inner door is about to be opened is treated with an atmosphere exchanger to ensure that the oxygen content is low before opening the inner door of the discharge end and the outer door of the feed end replacement chamber for simultaneous feeding and discharging.

[0017] S: Preheating, carbonization and cooling are carried out in the same way as conventional methods, with parameters carefully controlled.

[0018] S: Post-discharge processing: Open the prepared replacement chamber door, remove the sagger, screen and demagnetize to obtain qualified products.

[0019] The present invention has at least the following beneficial effects:

[0020] During the operation of this device, when preparing to open the outer door of one of the replacement chambers, a gas exchange device is used to exchange the protective atmosphere in that replacement chamber with the gas in the replacement chamber of the other inner door that is about to be opened. Through this exchange, the oxygen content in the replacement chamber of the inner door about to be opened can be significantly reduced. As a result, the amount of protective atmosphere required to replace the gas in that replacement chamber using the gas exchange device will be significantly reduced. At the same time, the protective atmosphere content in the replacement chamber of the outer door about to be opened can be significantly reduced after the exchange, thereby reducing leakage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 Another structural diagram;

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of partial cross-section;

[0024] Figure 4 For the present invention Figure 3 Schematic diagram of partial cross-section;

[0025] Figure 5 For the present invention Figure 4 Schematic diagram of partial cross-section;

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of partial cross-section;

[0027] Figure 7 For the present invention Figure 6 Schematic diagram of partial cross-section;

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of the structure of area A in the middle.

[0029] In the diagram: 1-Roller kiln; 11-Replacement chamber; 12-Inner door; 13-Outer door; 2-Connecting component; 3-Gas exchange component; 4-Atmosphere replacement component; 21-Conduit 1; 22-Conduit 2; 23-Gas diffuser; 24-Mounting plate; 25-Round hole; 26-Hollow tube; 27-Through hole 1; 28-Mounting bracket; 29-Drive motor 1; 31-Fan blade; 32-Through hole 2; 33-Circular ring; 34-Connecting pipe; 35-Annular plate; 36-Docking hole; 37-Arc groove; 38-Sealing block; 39-Docking groove; 41-Rotating component; 42-One-way valve; 43-Gear ring; 44-Drive motor 2; 45-Gear disc; 46-Annular convex; 47-Sealing plate; 48-Spring; 49-Horizontal guide pipe; 51-Vertical guide pipe; 52-Ventilation hole. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1-8 The present invention provides a technical solution: a carbonization device for lithium battery negative electrode materials, comprising a roller kiln 1 and a replacement chamber 11 disposed within the roller kiln 1, the replacement chamber 11 comprising an inner door 12 and an outer door 13, characterized in that it further comprises:

[0032] The connecting piece 2 is installed on the roller kiln 1, and the top and bottom ends of the two replacement chambers 11 are connected to each other through the connecting piece 2;

[0033] Gas exchange unit 3, installed on roller kiln 1 and connected to connecting member 2, is used to exchange the protective atmosphere inside one displacement chamber 11 with the gas inside another displacement chamber 11 whose inner door 12 is about to be opened, through connecting member 2 before the outer door 13 of one displacement chamber 11 is opened.

[0034] Atmosphere replacement component 4 is installed on roller kiln 1 and connected to connecting component 2. It is used to replace the gas in replacement chamber 11, which is about to be opened, with a protective atmosphere after the gas exchange is completed, so as to ensure that the oxygen content in replacement chamber 11 is not higher than the set value.

[0035] Specifically, during the operation of this device, when preparing to open the outer door 13 of one of the replacement chambers 11, the protective atmosphere in the replacement chamber 11 is exchanged with the gas in the replacement chamber 11 of the inner door 12 that is about to be opened, using the gas exchanger 3. Through this exchange, the oxygen content in the replacement chamber 11 of the inner door 12 that is about to be opened can be significantly reduced. As a result, the amount of protective atmosphere required to replace the gas in the replacement chamber 11 using the gas exchanger will be significantly reduced. At the same time, the protective atmosphere content in the replacement chamber 11 of the outer door 13 that is about to be opened can be significantly reduced after the exchange, so as to reduce leakage.

[0036] The connecting component 2 includes a first conduit 21 fixedly connected to the roller kiln 1. Both ends of the first conduit 21 are respectively connected to the top of the two replacement chambers 11. A second conduit 22 is fixedly connected to the roller kiln 1. Both ends of the second conduit 22 are respectively connected to the bottom of the two replacement chambers 11. Gas diffusers 23 are provided at the top and bottom of the replacement chambers 11. The gas diffusers 23 are connected to the first conduit 21 and the second conduit 22 for gas diffusion.

[0037] The gas diffuser 23 includes horizontal conduits 49 fixedly connected to the top and bottom of the replacement chamber 11. Two horizontal conduits 49 are connected to conduit 1 21 and conduit 2 22 respectively. Multiple vertical conduits 51 are evenly connected to the horizontal conduits 49, and multiple vent holes 52 are evenly provided on the vertical conduits 51. Through the combination of the horizontal conduits 49, vertical conduits 51, and vent holes 52, the gas diffuser 23 evenly disperses the gas to all corners of the replacement chamber 11, avoiding excessively high or low local gas concentrations and ensuring efficient and uniform gas exchange. Specifically, when nitrogen is used as the protective atmosphere, due to the fact that nitrogen is less dense than air, a clear stratification phenomenon occurs inside the replacement chamber 11: nitrogen naturally accumulates at the top of the replacement chamber 11, while air settles to the bottom. Therefore, during gas exchange between the two replacement chambers 11, nitrogen preferentially flows through the higher-positioned conduit 1 21, while air is exchanged through the lower-positioned conduit 2 22. This design cleverly utilizes the physical properties of gases to minimize the mixing of nitrogen and air during the exchange process. Through this layered flow design, the mixing of nitrogen and air is reduced, resulting in higher purity nitrogen entering the replacement chamber 11.

[0038] Meanwhile, this device employs a design with two hollow tubes 26. When gas exchange occurs in the two replacement chambers 11, the replacement chamber 11 initially containing a large amount of protective atmosphere will draw protective atmosphere from conduit one 21 into the other replacement chamber 11. At the same time, the replacement chamber 11 initially containing a large amount of air will draw air from conduit two 22 into the replacement chamber 11 initially containing a large amount of protective atmosphere. This design promotes active gas flow, forming an orderly gas exchange cycle and reducing the mixing of protective atmosphere and air caused by gas compression. This device guides active gas flow through the design of double hollow tubes 26, avoiding passive gas compression during the exchange process and greatly reducing the probability of mixing of the two gases.

[0039] The gas exchange component 3 includes a mounting plate 24 fixedly connected to the roller kiln 1. Two circular holes 25 are symmetrically opened on the mounting plate 24. Hollow tubes 26 are provided in both circular holes 25. Multiple through holes 27 are opened on the mounting plate 24. The two ends of the hollow tubes 26 are connected to the first conduit 21 and the second conduit 22 through the through holes 27.

[0040] A mounting bracket 28 is fixedly connected inside the hollow tube 26. A drive motor 29 is fixedly connected to the mounting bracket 28. Multiple fan blades 31 are evenly fixedly connected to the output shaft of the drive motor 29. When the two drive motors 29 are started, the fan blades 31 are driven to rotate, so that the gas exchange flow in the two replacement chambers 11.

[0041] The atmosphere replacement component 4 includes through holes 32 at both ends of the mounting plate 24. One through hole 32 is connected to the protective atmosphere supply device through a conduit, and the other through hole 32 is connected to the protective atmosphere treatment device through a conduit.

[0042] A circular ring 33 is provided inside the circular hole 25. The circular ring 33 is fixedly connected to the mounting plate 24. Two connecting pipes 34 are symmetrically fixedly connected to the circular ring 33. The connecting pipes 34 are connected to the hollow pipe 26. An annular plate 35 is rotatably connected inside the circular hole 25. The inner wall of the annular plate 35 contacts and abuts against the outer wall of the circular ring 33 to form a rotational seal. Two docking holes 36 are symmetrically opened on the annular plate 35 for connecting the through hole 27 and the connecting pipe 34. An arc-shaped groove 37 is opened on the annular plate 35, with its two ends communicating with the two docking holes 36 respectively. A sealing block 38 is fixedly connected to the circular ring 33. The sealing block 38 is slidably connected to the inner wall of the arc-shaped groove 37 to separate the arc-shaped groove 37 and prevent the two docking holes 36 from communicating.

[0043] Furthermore, a docking groove 39 is provided on the annular plate 35 for docking with the through hole 27. A rotating part 41 connected to the two annular plates 35 is provided on the mounting plate 24 for driving the two annular plates 35 to rotate after the gas exchange is completed, so that the protective atmosphere supply device and the protective atmosphere treatment device are connected to the replacement chamber 11 of the inner door 12 to be opened through the hollow tube 26.

[0044] Specifically, when the device needs to feed or discharge materials, the inner door 12 of the feed-end replacement chamber 11 is closed first, and the outer door 13 of the discharge-end replacement chamber 11 is also closed, so that both the inner door 12 and the outer door 13 of the two replacement chambers 11 are closed. At this time, the replacement chamber 11 at the feed end is filled with a protective atmosphere, while the replacement chamber 11 at the discharge end contains a large amount of air. At this time, both hollow tubes 26 are connected to the first conduit 21 and the second conduit 22 through the connecting pipe 34, the docking hole 36, and the through hole 27, respectively. Then, the two drive motors 29 are started to drive the fan blades 31 to rotate, thereby exchanging the gas in the two replacement chambers 11. After the exchange is completed, the replacement chamber 11 at the feed end contains a large amount of air, while the replacement chamber 11 at the discharge end contains a large amount of protective atmosphere, thereby significantly reducing the oxygen content in this replacement chamber 11. Then, drive motor 244 is started to drive the gear disk 45 to rotate, which in turn drives the two gear rings 43 to rotate, thereby driving the two annular plates 35 to rotate. Then, the docking grooves 39 on the two annular plates 35 are aligned and connected with conduit 1 21 and conduit 2 22 respectively. At the same time, a docking hole 36 is aligned with through hole 2 32, and the arc groove 37 is aligned with connecting pipe 34. At this time, the protective atmosphere discharged by the protective atmosphere supply device will pass through hollow pipe 26 and then be filled into the outlet displacement chamber 11. Then, the gas at the bottom of this displacement chamber 11 will be discharged through hollow pipe 26. During this process, drive motor 29 is started to actively extract and replace the gas in the outlet displacement chamber 11, which also reduces the probability of the protective atmosphere mixing with air due to gas compression, thereby reducing the amount of protective atmosphere charged.

[0045] After the atmosphere replacement is completed, open the outer door 13 of the feed end replacement chamber 11 and the inner door 12 of the discharge end replacement chamber 11. After the uncarbonized material enters the feed end replacement chamber 11 and the carbonized material is discharged, close the inner door 12 and outer door 13 of both replacement chambers 11. Then, perform gas exchange and atmosphere replacement operations again, and repeat the cycle.

[0046] Both docking slots 39 are equipped with one-way valves 42. The one-way valve 42 located in the annular plate 35 corresponding to the first conduit 21 is used to allow gas to enter the first conduit 21 only through the docking slot 39 after the annular plate 35 is rotated. The one-way valve 42 located in the annular plate 35 corresponding to the second conduit 22 is used to allow gas to enter the hollow tube 26 only through the docking slot 39 after the annular plate 35 is rotated.

[0047] Specifically, the design of the one-way valve 42 within the docking groove 39, which connects to conduit 22, is as follows: During the atmosphere replacement process, the drive motor 29 is first started, driving the fan blade 31 to rotate. The suction force generated by the fan blade 31 overcomes the elastic force of the spring 48 within the one-way valve 42, actively extracting the gas from the replacement chamber 11. This promotes the active flow of gas within the replacement system, preventing gas compression and mixing. Once the atmosphere replacement is complete, the drive motor 29 stops operating. At this time, the protective atmosphere supply device continues to discharge protective atmosphere. Due to the cooperation between the spring 48 inside the one-way valve 42 and the sealing plate 47, the spring 48 quickly recovers its deformation the instant the motor stops and the suction disappears, pushing the sealing plate 47 to tightly adhere to the valve port, temporarily sealing the replacement chamber 11. In this way, the replacement chamber 11 is not only filled with protective atmosphere but also forms a certain positive pressure. This positive pressure forms an effective barrier, greatly reducing the possibility of outside air entering the replacement chamber 11.

[0048] The design of the one-way valve 42 in the docking groove 39 that connects with the conduit prevents the leakage of gas entering the replacement chamber 11 during the gas replacement process through the cooperation of the spring 48 and the sealing plate.

[0049] The rotating component 41 includes a gear ring 43 fixedly connected to the annular plate 35, with two gear rings 43 meshing. A second drive motor 44 is fixedly connected to the mounting plate 24. A gear disk 45 that meshes with one of the gear rings 43 is fixedly connected to the output shaft of the second drive motor 44. Starting the second drive motor 44 drives the two annular plates 35 to rotate.

[0050] The one-way valve 42 includes two annular protrusions 46 fixedly connected in the docking groove 39. A sealing plate 47 is provided on one side of one annular protrusion 46, and a spring 48 is provided between one side of the sealing plate 47 and the other annular protrusion 46.

[0051] A carbonization method for a lithium battery anode material carbonization device, used in the above-mentioned lithium battery anode material carbonization device: S1: Raw material loading, the pre-treated anode material is loaded into a sagger and placed at the feed end of the roller kiln 1, and the replacement chamber 11 is initially closed.

[0052] S2: Atmosphere treatment before continuous feeding and discharging. Before opening the outer door 13 of the feed end replacement chamber 11, the gas in the two replacement chambers 11 is exchanged with an atmosphere exchanger. Then, the replacement chamber 11 that is about to open the inner door 12 is treated with an atmosphere exchanger 4 to ensure that the oxygen content is low before opening the inner door 12 of the discharge end and the outer door 13 of the feed end replacement chamber 11 to carry out simultaneous feeding and discharging.

[0053] S3: Preheating, carbonization and cooling are carried out in the same way as conventional methods, with parameters carefully controlled.

[0054] S4: Post-discharge processing: Open the outer door 13 of the processed replacement chamber 11, take out the sagger, screen and demagnetize to obtain qualified products.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A lithium battery negative material carbonization device, comprising a roller kiln (1) and a replacement chamber (11) arranged in the roller kiln (1), the replacement chamber (11) comprises an inner door (12) and an outer door (13), characterized in that, Also include: The communication piece (2) is arranged on the roller kiln (1), and the top and bottom ends of the two displacement chambers (11) are communicated with each other through the communication piece (2); The gas exchange piece (3) is arranged on the roller kiln (1) and connected with the communication piece (2), which is used for exchanging the gas in one displacement chamber (11) with another displacement chamber (11) before the inner door (12) of the displacement chamber (11) is opened. The atmosphere displacement piece (4) is arranged on the roller kiln (1) and connected with the communication piece (2), which is used for replacing the gas in the displacement chamber (11) with protective atmosphere through the atmosphere displacement piece (4) after the gas exchange is completed, so as to ensure that the oxygen content in the displacement chamber (11) is not higher than the set value. The communication piece (2) includes a conduit one (21) fixedly connected on the roller kiln (1), the two ends of the conduit one (21) are communicated with the top ends of the two displacement chambers (11) respectively, the roller kiln (1) is fixedly connected with a conduit two (22), the two ends of the conduit two (22) are communicated with the bottom ends of the two displacement chambers (11) respectively, the top and bottom ends of the displacement chamber (11) are provided with a gas diffusion piece (23), the gas diffusion piece (23) is connected with the conduit one (21) and the conduit two (22), which is used for diffusing gas.

2. The lithium battery anode material carbonization device according to claim 1, wherein: The gas exchange piece (3) includes a mounting plate (24) fixedly connected on the roller kiln (1), the mounting plate (24) is symmetrically provided with two circular holes (25), the two circular holes (25) are provided with a hollow tube (26) respectively, and the mounting plate (24) is provided with a through hole one (27), the two ends of the hollow tube (26) are communicated with the conduit one (21) and the conduit two (22) through the through hole one (27); And a mounting bracket (28) is fixedly connected in the hollow tube (26), the mounting bracket (28) is fixedly connected with a driving motor one (29), and a plurality of fan blades (31) are uniformly fixedly connected on the output shaft of the driving motor one (29), two driving motors one (29) are started to make the gas in the two displacement chambers (11) exchange and flow.

3. The carbonization device for lithium battery anode material according to claim 2, characterized in that: The atmosphere displacement piece (4) includes a through hole two (32) opened at both ends of the mounting plate (24), one through hole two (32) is communicated with the protective atmosphere supply device through a conduit, and the other through hole two (32) is communicated with the protective atmosphere treatment device through a conduit; And the circular hole (25) is provided with a circular ring (33), the circular ring (33) is fixedly connected with the mounting plate (24), two communication pipes (34) are fixedly connected with the circular ring (33) symmetrically, the communication pipe (34) is in communication connection with the hollow tube (26), the circular hole (25) is rotatably connected with the annular plate (35), the inner wall of the annular plate (35) is in contact with the outer wall of the circular ring (33), two butt joints (36) are symmetrically formed in the annular plate (35), for the communication connection of the through hole one (27) and the communication pipe (34), the annular plate (35) is provided with two arc grooves (37) in communication with the two butt joints (36) respectively, and the circular ring (33) is fixedly connected with the blocking block (38), the blocking block (38) is in sliding connection with the inner wall of the arc groove (37), for separating the arc groove (37); And the annular plate (35) is provided with a butt joint groove (39) for butt joint with the through hole one (27), the mounting plate (24) is provided with a rotating part (41) connected with the two annular plates (35), for rotating the two annular plates (35) after the gas exchange is completed, so that the protective atmosphere supply device and the protective atmosphere treatment device are communicated with the replacement chamber (11) to be opened by the hollow tube (26).

4. The carbonization device for lithium battery anode material according to claim 3, characterized in that: The two butt joint grooves (39) are each provided with a one-way valve (42), the one-way valve (42) arranged in the annular plate (35) corresponding to the conduit one (21) is used for making the gas only enter the conduit one (21) through the butt joint groove (39) after rotating the annular plate (35), and the one-way valve (42) arranged in the annular plate (35) corresponding to the conduit two (22) is used for making the gas only enter the hollow tube (26) through the butt joint groove (39) after rotating the annular plate (35).

5. The carbonization device for lithium battery anode material according to claim 4, characterized in that: The rotating part (41) includes a gear ring (43) fixedly connected to the annular plate (35), the two gear rings (43) are engaged, the mounting plate (24) is fixedly connected with a driving motor two (44), the output shaft of the driving motor two (44) is fixedly connected with a gear disc (45) engaged with one gear ring (43), and the driving motor two (44) is started to drive the two annular plates (35) to rotate.

6. The carbonization device for lithium battery anode material according to claim 5, wherein: The one-way valve (42) includes two annular protrusions (46) fixedly connected in the butt joint groove (39), one side of one annular protrusion (46) is provided with a blocking plate (47), and the other side of the blocking plate (47) is provided with a spring (48) between the other annular protrusion (46).

7. The carbonization device for lithium battery anode material according to claim 6, wherein: The gas diffusion part (23) includes a horizontal conduit (49) fixedly connected to the top end and the bottom end of the replacement chamber (11), the two horizontal conduits (49) are in communication connection with the conduit one (21) and the conduit two (22) respectively, the horizontal conduit (49) is uniformly and in communication connection with a plurality of vertical conduits (51), and a plurality of air holes (52) are uniformly formed in the vertical conduit (51).

8. A carbonization method of a lithium battery negative electrode material carbonization apparatus, using the lithium battery negative electrode material carbonization apparatus according to any one of claims 1 to 7, characterized by: The method comprises the following steps: S1: raw material loading, the pretreated negative electrode material is loaded into the sagger, placed in the feeding end of the roller kiln (1), and the replacement chamber (11) is initially closed; S2: Continuous feeding and discharging atmosphere treatment, before opening the feeding end displacement chamber (11) outside door (13), using atmosphere exchange piece to exchange two displacement chamber (11) gas, then using atmosphere displacement piece (4) to treat the displacement chamber (11) which is about to open the inner door (12), ensuring the oxygen content is low before opening the discharging end inner door (12) and the feeding end displacement chamber (11) outside door (13) to carry out simultaneous feeding and discharging; S3: Preheating, carbonization and cooling, same as conventional method, preheating, carbonization and cooling are carried out in turn, and parameters are controlled well; S4: Discharging post-treatment, opening the outside door (13) of the treated displacement chamber (11), taking out the sagger, screening and demagnetizing to obtain qualified products.

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