Lithium ion battery negative electrode material impurity removal equipment with preheating function

Abstract

The utility model belongs to the technical field of waste lithium ion battery recovery, and discloses lithium ion battery cathode material impurity removal equipment with a preheating function, which comprises a preheating cylinder, a gas recycling inlet is formed in the bottom wall of the preheating cylinder, and a gas exhaust port is formed in the top wall of the preheating cylinder; the top of one end of a barrel body of the auger conveying mechanism is communicated with a feeding pipeline, and the bottom of the other end of the barrel body is communicated with a discharging pipeline; a preheating device is mounted in the auger conveying mechanism; the top end of one side of the high-temperature calcining furnace is communicated with a discharging pipeline, the top end of the other side is communicated with a gas recycling inlet through a first heat insulation channel pipe, and a calcined material outlet is formed in the bottom of one side of the high-temperature calcining furnace; the bottom of the flue gas purification device communicates with the gas outlet through a second heat insulation channel pipe, and the top of the flue gas purification device communicates with an exhaust chimney. The impurity removal equipment not only can preheat an initial material, but also can heat a subsequent material by reusing high-temperature gas, so that the energy consumption is reduced, and the calcination impurity removal efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of recycling waste lithium-ion batteries, and more specifically to a lithium-ion battery negative electrode material impurity removal device with a preheating function. Background Art

[0002] Since the advent of lithium-ion batteries, they have been widely used in civil and military applications such as mobile phones, laptops, camcorders, digital cameras, etc. due to their advantages of high voltage, small size, light weight, high specific energy, no memory effect, no pollution, low self-discharge, and long life. The life of lithium-ion batteries is generally about 3 years. Since the advent of lithium-ion batteries, a large number of lithium-ion batteries have entered the recycling stage, and as the use of lithium-ion batteries continues to increase, the amount of waste will also continue to increase.

[0003] When recycling, waste lithium-ion batteries need to be pre-processed before recycling to achieve the purpose of preliminary separation. In order to prevent short circuit or spontaneous combustion of waste lithium-ion batteries during disassembly, they are usually soaked in saturated salt solution to fully discharge them. The fully discharged waste batteries can be processed by manual disassembly, mechanical crushing and screening to obtain waste graphite black powder.

[0004] In the process of processing waste lithium-ion batteries, some metal impurities (Li, Al, Co, Ni, etc.), organic electrolytes and binders will inevitably be mixed in the graphite, affecting the subsequent material recovery efficiency. Therefore, it is necessary to remove impurities and purify the negative electrode material.

[0005] For the purification of negative electrode materials, a high-temperature calcination method can be used to remove trace metal impurities in graphite while recycling the negative electrode current collector copper foil. However, the use of high-temperature calcination methods will produce toxic gases and have high temperature requirements and high energy consumption. In the prior art, although there is already a method of reusing toxic high-temperature gases to reflux the gas to preheat the materials, there is still a problem that during the initial calcination, the initial materials cannot be preheated by the reflux of toxic high-temperature air, but directly enter the calcination furnace at room temperature, which makes the initial materials have a long calcination time and high energy consumption due to the large temperature difference during calcination.

[0006] Therefore, how to provide a conveying mechanism with a preheating device to heat the initial material, and after the initial material is calcined, reuse the toxic high-temperature gas generated after calcination to preheat the waste graphite black powder to form an impurity removal device is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0007] In view of this, the utility model provides a lithium-ion battery negative electrode material impurity removal device that adopts an auger conveying mechanism with a preheating device, which can not only convey the material, but also preheat the material, so that the initial material is heated when entering the calcining furnace, thereby reducing the calcination time and energy consumption. At the same time, the generated high-temperature toxic gas can be refluxed and reused to preheat the subsequent material and reduce energy consumption.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A lithium-ion battery negative electrode material impurity removal device with a preheating function, comprising:

[0010] A box body, wherein the box body is provided with more than three layers of installation platforms;

[0011] A preheating cylinder, the preheating cylinder is horizontally mounted on the middle-level mounting platform, the bottom wall of the preheating cylinder is provided with a gas recycling inlet and the top wall thereof is provided with a gas exhaust outlet;

[0012] The auger conveying mechanism comprises a cylinder and a spiral conveying part located in the cylinder, the cylinder is coaxially located in the preheating cylinder and both ends of the cylinder pass through both ends of the preheating cylinder, the auger conveying part is horizontally arranged and one end is blocked by a sealing plate, the top of one end of the cylinder is connected to the feed pipe, and the bottom of the other side is connected to the discharge pipe;

[0013] A preheating device, the preheating device is installed in the auger conveying part;

[0014] A driving motor, the driving motor is mounted at an end away from the sealing plate and is drivingly connected to the auger conveying part;

[0015] A high-temperature calcining furnace, the high-temperature calcining furnace is installed on the bottom installation platform, a calcining inlet is provided at the top of one side of the high-temperature calcining furnace, the discharge pipe passes through the middle installation platform and is connected to the calcining inlet, a hot gas outlet is provided at the top of the other side and is connected to a first heat-insulating channel pipe, the first heat-insulating channel pipe passes upward through the middle installation platform and is connected to the gas recycling inlet, and a calcining material outlet is provided at the bottom of one side of the high-temperature calcining furnace;

[0016] A flue gas purification device, the flue gas purification device is installed on the upper installation platform, a gas purification inlet is provided at the bottom of the flue gas purification device and is connected to a second heat-insulated channel pipe, the second heat-insulated channel pipe passes downward through the upper installation platform and is connected to the gas exhaust port, a clean gas exhaust port is provided at the top of the flue gas purification device and is connected to an exhaust chimney, and the exhaust chimney passes upward through the top plate of the box body to exhaust gas outwards;

[0017] A controller is mounted on the outer wall of the box body, and is electrically connected to the preheating device and the drive motor.

[0018] Through the above technical scheme, it can be known that compared with the prior art, the utility model discloses a lithium-ion battery negative electrode material impurity removal device with a preheating function. After the waste battery is completely discharged, it can be processed by manual disassembly, mechanical crushing and screening. After the waste graphite black powder is obtained, the waste graphite black powder is put into the screw conveying mechanism through the feeding pipe as the initial material. The controller controls the start-up drive motor and the preheating device at the same time to drive the screw conveying part of the screw conveying mechanism to rotate and convey the initial material. At the same time, the preheating device starts heating in the screw conveying part, thereby heating the initial material to make the temperature of the initial material After being raised, it is discharged into the high-temperature calcining furnace along the discharge pipe of the cylinder. Due to the advance preheating, the calcination time in the high-temperature calcining furnace can be shortened and energy consumption can be reduced. Afterwards, the high-temperature exhaust gas generated in the high-temperature calcining furnace first passes through the first heat-insulating channel pipe into the preheating cylinder, and the heat is transferred to the cylinder, thereby heating the inside of the cylinder, and then preheating the subsequent materials transported by the spiral conveying part to increase the temperature. At this time, the preheating device can be turned off by the controller, and the preheating of the material can be met by relying on the reuse of the high-temperature gas, so that the toxic high-temperature gas can be reused, reducing energy waste. At the same time, the gas is purified to reduce pollution to the external environment.

[0019] Furthermore, the auger conveying part includes a rotating shaft and a spiral blade. The rotating shaft is coaxially placed in the cylinder and one end of it is rotatably connected to the sealing plate, and the other end is fixedly connected to the output end of the driving motor. The spiral blade is installed on the rotating shaft, and the outer edge end of the spiral blade abuts against the inner wall of the cylinder.

[0020] The beneficial effect of adopting the above technical solution is: using the auger conveying mechanism, not only has good sealing performance and stable and reliable operation, but also has a certain stirring effect on the material through rotation during the material conveying process, so that the material is heated evenly during the preheating process and the preheating effect is good.

[0021] Furthermore, sealing rings are clamped at the connections between the two ends of the preheating cylinder and the cylinder body.

[0022] The beneficial effects of adopting the above technical solution are: improving the airtightness of the preheating cylinder, preventing the problem of toxic gas overflow during the high-temperature air reflux preheating process, and improving the safety of the working environment.

[0023] Furthermore, the interior of the rotating shaft is hollow, and the preheating device is a plurality of heaters connected in series, the plurality of heaters are arranged inside the rotating shaft, and the plurality of heaters are electrically connected to the controller.

[0024] The beneficial effect of adopting the above technical solution is: multiple heaters are placed in series and installed in the rotating shaft, so as to avoid the influence on the conveying process caused by the heaters being installed in the conveying cylinder, so that the conveying mechanism can work normally.

[0025] Furthermore, it also includes a temperature sensor, which is embedded and installed on the inner side of the discharge pipe wall, and the temperature sensor is connected to the controller by electrical signals.

[0026] The beneficial effect of adopting the above technical solution is: the temperature of the preheated material is detected. When it exceeds the rated temperature of the heater for heating the material, it means that the refluxed high-temperature gas has preheated the material. At this time, the heater can be turned off and only high-temperature gas is needed for preheating, thereby reducing energy consumption.

[0027] Furthermore, an electronic valve is installed at the second heat-insulating channel tube, and the electronic valve is electrically connected to the controller to control the retention time of the high-temperature gas in the preheating cylinder.

[0028] The beneficial effect of adopting the above technical solution is: the opening and closing of the electronic valve is controlled by the controller to control the retention time of the high-temperature air in the preheating cylinder, so that the high-temperature air has enough time to transfer heat in the preheating cylinder, making full use of energy and reducing waste.

[0029] Furthermore, a gas pressure sensor is installed on the inner wall of the preheating cylinder, and the gas pressure sensor is connected to the controller via an electrical signal.

[0030] The beneficial effect of adopting the above technical solution is: by setting up a gas pressure sensor, the gas pressure in the preheating cylinder can be detected and a rated value can be set. By cooperating with the electronic valve, when the electronic valve is closed, the gas increases and the pressure in the preheating cylinder increases. When it is detected that the pressure reaches the rated value, the electronic valve is opened to discharge part of the gas from the preheating cylinder, thereby avoiding damage to the preheating cylinder due to excessive gas pressure.

[0031] Furthermore, one side wall of the box body is a box body door, which is divided into three and is respectively separated by the middle installation platform and the upper installation platform, one end of the three box body doors are rotatably installed on the box body, and door handles are installed on the outer end surfaces of the three box body doors.

[0032] The beneficial effect of adopting the above technical solution is: by installing box doors with door handles in layers on the flue gas purification device, preheating cylinder and high-temperature calcining furnace, the internal devices can be easily opened for inspection and maintenance. During operation, the box doors are all in a closed state to isolate the internal heat, making it easier for staff to operate the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 This is a three-dimensional structural schematic diagram of the lithium-ion battery negative electrode material impurity removal equipment provided by the utility model.

[0035] Figure 2 for Figure 1 Front view of .

[0036] Figure 3 The utility model provides a schematic diagram of the three-dimensional structure of the internal part of the lithium-ion battery negative electrode material impurity removal equipment.

[0037] Figure 4 for Figure 3 Front view of .

[0038] Figure 5 It is a cross-sectional view of the auger conveying mechanism.

[0039] Figure 6 A cross-sectional view of the rotating shaft.

[0040] Among them, 1-box, 11-installation platform, 111-middle installation platform, 112-bottom installation platform, 113-upper installation platform, 12-top plate, 13-box door, 131-door handle, 2-preheating cylinder, 21-through hole, 22-gas recycling inlet, 23-gas outlet, 24-second heat insulation channel pipe, 241-electronic valve, 3-auger conveying mechanism, 31-cylinder, 311-sealing plate, 312-feeding pipe, 313-discharging pipe, 32-auger conveying part, 321-rotating shaft, 322-spiral blade, 4-preheating device, 41-heater, 5-driving motor, 6-high-temperature calcining furnace, 61-calcining inlet, 62-hot gas outlet, 63-first heat-insulating channel pipe, 64-calcining material outlet, 7-flue gas purification device, 71-gas purification inlet, 72-clean gas exhaust port, 73-exhaust chimney, 8-controller, 9-temperature sensor. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] The utility model discloses a lithium ion battery negative electrode material impurity removal device with a preheating function, see Figure 1-6 As shown, it includes a box body 1 with more than three layers of mounting platforms 11 inside; a preheating cylinder 2 is horizontally mounted on the middle mounting platform 111, a gas recycling inlet 22 is provided on the bottom wall of the preheating cylinder 2, and a gas exhaust port 23 is provided on the top wall; an auger conveying mechanism 3 is also installed in the preheating cylinder 2, the auger conveying mechanism 3 includes a cylinder body 31 and a spiral conveying part 32 located in the cylinder body 31, the cylinder body 31 is coaxially located in the preheating cylinder 2 and both ends pass through both ends of the preheating cylinder 2; the spiral conveying part 32 is horizontally arranged and one end is blocked by a sealing plate 311, the top of one end of the cylinder body 31 is connected to a feed pipe 312, and the bottom of the other end is connected to a discharge pipe 313; a preheating device 4 is installed in the spiral conveying part 32; a driving motor 5 is installed at the end away from the sealing plate 311 and is transmission-connected to the spiral conveying part 32;

[0043] A high-temperature calcining furnace 6 is installed on the bottom installation platform 112. A calcining inlet 61 is provided at the top of one side of the high-temperature calcining furnace 6. A discharge pipe 313 passes upward through the middle installation platform 111 and is connected to the calcining inlet 61. A hot gas outlet 62 is provided at the top of the other side and is connected to a first heat-insulating channel pipe 63. The first heat-insulating channel pipe 63 passes upward through the middle installation platform 111 and is connected to the gas recycling inlet 22. A calcining material outlet 64 is provided at the bottom of one side of the high-temperature calcining furnace.

[0044] A flue gas purification device 7 is installed on the upper installation platform 113. A gas purification inlet 71 is provided at the bottom of the flue gas purification device 7 and is connected to a second heat-insulating channel tube 24. The second heat-insulating channel tube 24 passes downward through the upper installation platform 113 and is connected to the gas exhaust port 23. A clean gas exhaust port 72 is provided at the top of the flue gas purification device 7 and is connected to an exhaust chimney 73. The exhaust chimney 73 passes upward through the top plate 12 of the box body 1 to exhaust gas outwards. A controller 8 is installed on the outer wall of the box body 1, and the controller 8 is electrically controlled and connected to the preheating device 4 and the drive motor 5.

[0045] Specifically, the preheating cylinder 2 is an insulating cylinder, and an insulating layer can be attached to the inner wall of the preheating cylinder 2. The insulating material can be: graphite material, ceramic fiber, aluminum silicate fiber, perlite, etc., to maintain the temperature inside the box; the cylinder 31 is a heat-conducting cylinder to transfer the heat of the high-temperature gas to the inside of the cylinder 31, and its material can be selected as steel.

[0046] For an embodiment of the spiral conveying part 32 in the present invention, see Figure 5 As shown, it includes a rotating shaft 321 and a spiral blade 322. The rotating shaft 321 is coaxially disposed in the cylinder 31 and one end of the rotating shaft 321 is rotatably connected to the sealing plate 311, and the other end is fixedly connected to the output end of the driving motor 5. The spiral blade 322 is mounted on the rotating shaft 321, and the outer edge of the spiral blade 322 is in abutment with the inner wall of the cylinder 31. The use of the auger conveying mechanism 3 not only has good sealing performance and stable and reliable operation, but also has a certain stirring effect on the material through rotation during the material conveying process, so that the material is evenly heated during the preheating process, and the preheating effect is good.

[0047] In the above embodiment, sealing rings are clamped at the connection between the two ends of the preheating cylinder 2 and the cylinder body 31. This improves the airtightness of the preheating cylinder 2, prevents the problem of toxic gas overflow during the high-temperature air reflux preheating process, and improves the safety of the working environment.

[0048] In the above embodiments, see Figure 6 As shown, the interior of the rotating shaft 321 is hollow, and the preheating device 4 is a plurality of heaters 41 connected in series, and the plurality of heaters 41 are arranged in series inside the rotating shaft 321, and the plurality of heaters 41 are electrically connected to the controller 8. The plurality of heaters are placed in series and installed in the rotating shaft to avoid affecting the conveying process due to the heaters being installed in the conveying cylinder, so that the conveying mechanism can work normally.

[0049] Specifically, in order to improve the heating effect of the heater 41, the rotating shaft 321 outside the heater 41 is made of heat-conducting material. In this embodiment, round steel or seamless steel pipe is selected, which has both strength and is not easy to damage, and is easy to conduct heat and reduce energy consumption.

[0050] In another embodiment of the utility model, a temperature sensor 9 is further included. The temperature sensor 9 is embedded and installed on the inner side of the pipe wall of the discharge pipe 313. The temperature sensor 9 is electrically connected to the controller 8. The temperature of the preheated material is detected. When the temperature exceeds the rated temperature of the heater 41 for heating the material, it means that the refluxed high-temperature gas has preheated the material to a temperature exceeding the heating temperature of the heater 41. At this time, the heater 41 can be turned off, and only the high-temperature gas needs to be preheated to reduce the energy consumption of the heater 41.

[0051] In the above embodiment, an electronic valve 241 is installed at the second heat-insulating channel tube 24, and the electronic valve 241 is electrically connected to the controller 8 to control the retention time of the high-temperature gas in the preheating tube 2. The electronic valve 241 is opened and closed by the controller 8 to control the retention time of the high-temperature air in the preheating tube 2, so that the high-temperature air has enough time to transfer heat in the preheating tube 2, so as to make full use of energy and reduce waste.

[0052] In the above embodiment, a gas pressure sensor is also installed on the inner wall of the preheating cylinder 2, and the gas pressure sensor is connected to the controller 8 by electrical signals. By setting the gas pressure sensor, the gas pressure in the preheating cylinder 2 can be detected and a rated value can be set. By cooperating with the electronic valve 241, when the electronic valve 241 is closed, the gas in the preheating cylinder 2 increases, and the pressure in the preheating cylinder 2 increases. When it is detected that the pressure reaches the rated value, the electronic valve is opened to discharge part of the gas from the preheating cylinder, thereby avoiding damage to the preheating cylinder 2 due to excessive gas pressure.

[0053] In one embodiment of the box body 1 of the utility model, see Figure 1 As shown, one side wall of the box body 1 is a box body door 13, which is divided into three and is respectively separated by a middle installation platform 111 and an upper installation platform 113. One end of each of the three box body doors 13 is rotatably mounted on the box body 1, and a door handle 131 is installed on the outer end surface of each of the three box body doors 13. By installing box body doors with door handles in layers on the flue gas purification device 7, the preheating cylinder 2, and the high-temperature calcining furnace 6, it is convenient to open the internal devices for inspection and maintenance. When working, the box body doors are all in a closed state to isolate the internal heat, which is convenient for the staff to operate the controller 8.

[0054] In addition, the controller 8 is also equipped with a display screen, which can display the temperature reading corresponding to the temperature sensor and the pressure coefficient of the gas pressure sensor on the display screen, so that the staff can observe and record the numerical values. At the same time, an automatic working chip can be implanted and an automatic working process can be input, so that the equipment can automatically complete the cleaning work and improve the work efficiency. At the same time, an alarm can be installed at the controller 8 to alarm when the numerical value is abnormal or the automatic operation is abnormal, so as to promptly notify the staff and repair the equipment.

[0055] The working principle of the lithium-ion battery negative electrode material impurity removal device with preheating function of the utility model is as follows:

[0056] Before impurities are removed, the completely discharged waste batteries can be processed by manual disassembly, mechanical crushing and screening, and then the waste graphite black powder is obtained before entering the impurity removal step. The preheating device is started by the controller in advance. After a period of time, the waste graphite black powder is put into the screw conveying mechanism through the feeding pipe as the initial material. The driving motor is started by the controller to drive the screw conveying part of the screw conveying mechanism to rotate and convey the initial material. At the same time, the preheating device heats the initial material, so that the temperature of the initial material is increased and then discharged into the high-temperature calcining furnace along the discharge pipe of the cylinder. Due to the advance preheating, the calcination time in the high-temperature calcining furnace can be shortened and the energy consumption can be reduced. Afterwards, the high-temperature exhaust gas generated in the high-temperature calcining furnace is first passed through the first heat-insulating channel pipe into the preheating cylinder. Inside, the electronic valve is closed by the controller, so that the gas is temporarily retained in the preheating cylinder, and the high-temperature gas transfers heat to the cylinder, thereby heating the inside of the cylinder, and then preheating the subsequent materials transported by the spiral conveying part to increase the temperature. When it is observed that the temperature detected by the temperature sensor exceeds the preset value, the preheating device can be closed by the controller at this time, and the preheating of the material can be met by relying on the reuse of the high-temperature gas, so that the toxic high-temperature gas can be reused. At the same time, when it is observed that the pressure detected by the gas pressure sensor is about to reach the preset value, the electronic valve is opened by the controller, so that part of the gas that releases heat enters the flue gas purification device through the second heat-insulating channel pipe, purifies it, and then discharges it out of the box through the exhaust chimney, thus completing the working process of preheating and reusing the air.

[0057] Therefore, the impurity removal equipment can not only preheat the initial material, but also heat the subsequent material by reusing the high-temperature gas, thereby reducing energy consumption and improving the calcination impurity removal efficiency.

[0058] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0059] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lithium-ion battery negative electrode material impurity removal device with a preheating function, characterized in that: include: A box body (1), wherein the box body (1) is provided with more than three layers of mounting platforms (11); A preheating tube (2), wherein the preheating tube (2) is horizontally mounted on a middle-level mounting platform (111), a gas recycling inlet (22) is provided on a bottom wall of the preheating tube (2) and a gas exhaust outlet (23) is provided on a top wall thereof; An auger conveying mechanism (3), the auger conveying mechanism (3) comprising a barrel (31) and a spiral conveying portion (32) located in the barrel (31), the barrel (31) being coaxially located in the preheating barrel (2) and having both ends passing through both ends of the preheating barrel (2); the spiral conveying portion (32) being arranged horizontally and having one end blocked by a sealing plate (311); the top of one end of the barrel (31) being connected to a feed pipe (312), and the bottom of the other end being connected to a discharge pipe (313); A preheating device (4), wherein the preheating device (4) is installed in the spiral conveying part (32); A driving motor (5), the driving motor (5) being mounted at an end away from the sealing plate (311) and being drivingly connected to the spiral conveying portion (32); A high-temperature calcining furnace (6), wherein the high-temperature calcining furnace (6) is installed on a bottom installation platform (112), a calcining inlet (61) is provided at the top of one side of the high-temperature calcining furnace (6), the discharge pipe (313) passes upward through the middle installation platform (111) and is connected to the calcining inlet (61), a hot gas outlet (62) is provided at the top of the other side and is connected to a first heat-insulating channel pipe (63), the first heat-insulating channel pipe (63) passes upward through the middle installation platform (111) and is connected to the gas recycling inlet (22), and a calcining material outlet (64) is provided at the bottom of one side of the high-temperature calcining furnace; A flue gas purification device (7), the flue gas purification device (7) being installed on an upper installation platform (113), a gas purification inlet (71) being provided at the bottom of the flue gas purification device (7) and being connected to a second heat-insulating channel pipe (24), the second heat-insulating channel pipe (24) passing downward through the upper installation platform (113) and being connected to the gas exhaust port (23), a clean gas exhaust port (72) being provided at the top of the flue gas purification device (7) and being connected to an exhaust chimney (73), the exhaust chimney (73) passing upward through the top plate (12) of the box body (1) and exhausting gas outward; A controller (8), wherein the controller (8) is mounted on the outer wall of the box (1), and the controller (8) is electrically controlled and connected to the preheating device (4) and the drive motor (5).

2. The lithium-ion battery negative electrode material impurity removal device with preheating function according to claim 1, characterized in that: The spiral conveying part (32) comprises a rotating shaft (321) and a spiral blade (322); the rotating shaft (321) is coaxially disposed in the cylinder (31) and one end of the rotating shaft is rotationally connected to the sealing plate (311), and the other end is fixedly connected to the output end of the driving motor (5); the spiral blade (322) is mounted on the rotating shaft (321), and the outer edge end of the spiral blade (322) is in abutment with the inner wall of the cylinder (31).

3. The lithium-ion battery negative electrode material impurity removal device with preheating function according to claim 2, characterized in that: Sealing rings are clamped at the connection points between the two ends of the preheating cylinder (2) and the cylinder body (31).

4. The lithium-ion battery negative electrode material impurity removal device with preheating function according to claim 2, characterized in that: The interior of the rotating shaft (321) is hollow, and the preheating device (4) is a plurality of heaters (41) connected in series. The plurality of heaters (41) are arranged in an array inside the rotating shaft (321), and the plurality of heaters (41) are electrically connected to the controller (8).

5. The lithium-ion battery negative electrode material impurity removal device with preheating function according to claim 4, characterized in that: It also includes a temperature sensor (9), which is embedded and installed on the inner side of the pipe wall of the discharge pipe (313), and the temperature sensor (9) is connected to the controller (8) via an electrical signal.

6. The lithium-ion battery negative electrode material impurity removal device with preheating function according to claim 1, characterized in that: An electronic valve (241) is installed at the second heat-insulating channel tube (24), and the electronic valve (241) is electrically connected to the controller (8) to control the retention time of the high-temperature gas in the preheating cylinder (2).

7. The lithium-ion battery negative electrode material impurity removal device with preheating function according to claim 6, characterized in that: A gas pressure sensor is also installed on the inner wall of the preheating cylinder (2), and the gas pressure sensor is connected to the controller (8) via an electrical signal.

8. The lithium-ion battery negative electrode material impurity removal device with preheating function according to any one of claims 1 to 7, characterized in that: A side wall of the box body (1) is a box body door (13), and the box body door (13) is divided into three and is respectively separated by the middle installation platform (111) and the upper installation platform (113). One end of the three box body doors (13) is rotatably mounted on the box body (1), and door handles (131) are installed on the outer end surfaces of the three box body doors (13).

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