Continuous coating and carbonizing device for negative electrode material of lithium battery

Abstract

The invention discloses a lithium battery negative electrode material coating and carbonization continuous device, and relates to the technical field of lithium battery preparation, the lithium battery negative electrode material coating and carbonization continuous device comprises a feeding mechanism used for continuously receiving a negative electrode material, a coating mechanism arranged at the bottom of the feeding mechanism and used for atomizing a coating liquid and mixing the coating liquid with the negative electrode material, and a carbonization furnace arranged at the bottom of the coating mechanism, the carbonization furnace is used for continuously carbonizing a negative electrode material, a cooling mechanism is arranged at the bottom of the carbonization furnace, the cooling mechanism is used for continuously cooling the carbonized negative electrode material, and a linkage driving mechanism is arranged at the joint of the coating mechanism, the carbonization furnace and the cooling mechanism; the linkage driving mechanism not only provides power for the carbonization furnace and the cooling mechanism, but also provides power for input of nitrogen, so that the coating mechanism, the carbonization furnace and the cooling mechanism can complete continuous coating and carbonization treatment of the negative electrode material only by one group of drives, and the cost of continuous coating and carbonization treatment of the negative electrode material is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery preparation, in particular to a lithium battery negative electrode material coating and carbonization continuous device. BACKGROUND

[0002] The negative electrode material of a lithium battery is generally carbon-based or silicon-based, and then a layer of coating liquid is coated on the outside of the negative electrode material, the coating liquid can be pitch or resin, and then the negative electrode material coated with the coating liquid is subjected to high-temperature treatment for carbonization treatment, and the negative electrode material after carbonization treatment can store lithium ions;

[0003] The existing lithium battery negative electrode material coating and carbonization continuous device, such as the lithium battery negative electrode material coating and carbonization continuous device and its preparation method disclosed in Chinese patent application No. CN115275137A and the lithium ion battery negative electrode material coating, granulation, carbonization and graphitization device and method disclosed in Chinese patent application No. CN116314682A, when performing coating and carbonization operation on the lithium battery negative electrode material, need to use coating equipment, carbonization equipment and cooling equipment, and three power driving devices are needed between the three equipment, which on the one hand increases the cost of equipment use, and on the other hand increases the energy consumption of negative electrode material coating and carbonization, resulting in high cost of lithium battery negative electrode material. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present application is to provide a lithium battery negative electrode material coating and carbonization continuous device to solve the problem that the existing coating and carbonization continuous device needs to use multiple driving devices, which increases the energy consumption of negative electrode material coating and carbonization, resulting in high cost of lithium battery negative electrode material.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] Specifically, a lithium battery negative electrode material coating and carbonization continuous device is provided, which comprises a feeding mechanism for continuously receiving negative electrode material, a coating mechanism is arranged at the bottom of the feeding mechanism, the coating mechanism is used for atomizing and mixing the coating liquid with the negative electrode material, a carbonization furnace is arranged at the bottom of the coating mechanism, the carbonization furnace is used for continuously carbonizing the negative electrode material, a cooling mechanism is arranged at the bottom of the carbonization furnace, the cooling mechanism is used for continuously cooling the carbonized negative electrode material, a linkage driving mechanism is arranged at the joint of the coating mechanism, the carbonization furnace and the cooling mechanism, the linkage driving mechanism simultaneously provides driving force for the carbonization furnace and the cooling mechanism, so that the negative electrode material is continuously conveyed between the coating mechanism, the carbonization furnace and the cooling mechanism.

[0007] As a further scheme of the present application, the feeding mechanism comprises a feeding channel, one end of the feeding channel is connected with a conveying belt, and a feeding impeller is mounted in the feeding channel through a bearing.

[0008] As a further scheme of the present application: the coating mechanism comprises a coating tower, a discharge port is fixedly connected to the bottom end of the coating tower, a liquid storage tank is fixedly connected to one side of the bottom end of the coating tower, a liquid delivery pipeline is fixedly connected to the top end of the liquid storage tank, the end of the liquid delivery pipeline away from the liquid storage tank is fixedly connected to the side surface of the coating tower, and a pressure relief exhaust pipe is installed on the top side surface of the coating tower.

[0009] As a further scheme of the present application: the inside of the carbonization furnace is provided with a carbonization cylinder, a feeding pipeline is installed on the position close to the discharge port at one end of the carbonization furnace, and a sealing end cover is connected to the other end of the carbonization furnace.

[0010] As a further scheme of the present application: the carbonization cylinder comprises a cylinder body, a carbonization cavity is formed in the inside of the cylinder body, a first spiral blade is fixedly connected to the inner wall of the carbonization cavity, a driving gear ring is nested on the side surface of one end of the cylinder body, and a rolling bearing is nested on the side surface of the other end of the cylinder body.

[0011] As a further scheme of the present application: the cooling mechanism comprises a cooling cylinder, a driving screw is arranged in the inside of the cooling cylinder, the top end of one end of the cooling cylinder is fixedly connected to the sealing end cover, a water inlet port is connected to the bottom end of one end of the cooling cylinder, and a water outlet port is connected to the top end of the other end of the cooling cylinder.

[0012] As a further scheme of the present application: a cooling cavity and a water cooling cavity nested on the outside of the cooling cavity are formed in the inside of the cooling cylinder, a second spiral blade is arranged in the inside of the water cooling cavity, the water inlet port and the water outlet port are both in communication with the water cooling cavity, a feeding port is formed in the inside of one end of the cooling cavity, and the feeding port is sealingly connected to the bottom end of the sealing end cover.

[0013] As a further scheme of the present application: the driving screw comprises a driving shaft, a driving gear is fixedly connected to one end of the driving shaft, a third spiral blade is fixedly connected to the side surface of the driving shaft, and a gas delivery groove is formed in the third spiral blade.

[0014] As a further scheme of the present application: the linkage driving mechanism comprises a driving motor, a screw cylinder is connected to one end of the driving motor, a butt joint pipeline is fixedly connected to the top end of the side surface of the screw cylinder, a transmission box is arranged between the driving motor and the screw cylinder, a transmission rod is connected to the bottom side surface of the transmission box, a transmission gear is fixedly connected to the end of the transmission rod away from the transmission box, and a fan impeller box is nested on the side surface of the transmission rod.

[0015] As a further scheme of the present application: the butt joint cylinder is fixedly connected to one end of the outside of the cooling cavity, the end of the butt joint cylinder away from the cooling cavity is fixedly connected to a gas inlet pipeline, a discharge passage is formed in the bottom of the butt joint cylinder, the fan impeller box is arranged on the side surface of the gas inlet pipeline, the bottom of the transmission gear is engaged with the driving gear, and the top of the transmission gear is engaged with the driving gear ring through a gear.

[0016] The present application has the following advantages:

[0017] In the present application, the linkage driving mechanism not only provides power for the carbonization furnace and the cooling mechanism, but also provides power for the input of nitrogen, so that the coating mechanism, the carbonization furnace and the cooling mechanism only need one set of driving to complete the continuous coating and carbonization treatment of the negative electrode material, greatly reducing the cost of the continuous coating and carbonization treatment of the negative electrode material. The high-temperature nitrogen can finally enter the inside of the carbonization cylinder through the sealing end cover. The high-temperature nitrogen entering the inside of the carbonization cylinder can carry away the waste gas formed by the carbonization of the negative electrode material in the carbonization cylinder. Then the high-temperature nitrogen enters the inside of the coating tower together with the waste gas, so that a high-pressure state is formed in the inside of the coating tower, preventing oxygen in the external environment from entering the inside of the coating tower, and also preventing oxygen in the external environment from entering the carbonization cylinder and the cooling cylinder, preventing the negative electrode material from being oxidized by oxygen. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in conjunction with the drawings.

[0019] Figure 1 is a structural schematic diagram of the lithium battery negative electrode material coating and carbonization continuous device of the present application;

[0020] Figure 2 is a structural schematic diagram of the internal structure of the lithium battery negative electrode material coating and carbonization continuous device of the present application;

[0021] Figure 3 is a structural schematic diagram of the feeding mechanism and the coating mechanism in the present application;

[0022] Figure 4 is a sectional view of the feeding mechanism in the present application;

[0023] Figure 5 is a structural schematic diagram of the carbonization furnace, the cooling mechanism and the linkage driving mechanism in the present application;

[0024] Figure 6 is a partial structural schematic diagram of the carbonization furnace in the present application;

[0025] Figure 7 is a structural schematic diagram of the carbonization cylinder in the present application;

[0026] Figure 8 is a structural schematic diagram of the cooling mechanism in the present application;

[0027] Figure 9 is a partial sectional view of the cooling cylinder in the present application;

[0028] Figure 10 is a partial structural schematic diagram of the driving screw in the present application;

[0029] Figure 11 is a structural schematic diagram of the linkage driving mechanism in the present application.

[0030] Explanation of reference numerals in the attached drawings: 1. Feeding mechanism; 11. Feeding channel; 12. Conveyor belt; 13. Feed impeller; 14. Motor; 15. Worm; 16. Worm wheel; 2. Coating mechanism; 21. Coating tower; 22. Discharge port; 23. Liquid storage tank; 24. Liquid delivery pipeline; 25. Pressure relief and exhaust pipe; 3. Carbonization furnace; 31. Carbonization cylinder; 311. Cylinder body; 312. Carbonization chamber; 313. First spiral blade; 314. Drive gear ring; 315. Rolling bearing; 32. Sealing end cover; 33. Feeding pipeline; 34. Base; 4. Cooling mechanism; 41. Cooling... 411. Cooling chamber; 412. Feed port; 413. Water cooling chamber; 414. Second spiral blade; 42. Drive screw; 421. Drive shaft; 422. Drive gear; 423. Third spiral blade; 424. Air delivery channel; 43. Water inlet port; 44. Water outlet port; 45. Connecting cylinder; 46. Air inlet pipe; 47. Discharge channel; 5. Linkage drive mechanism; 51. Drive motor; 52. Screw cylinder; 53. Connecting pipe; 54. Transmission box; 55. Transmission rod; 56. Transmission gear; 57. Fixed bearing seat; 58. Fan impeller box. Detailed Implementation

[0031] 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.

[0032] As one embodiment of the present invention, such as Figures 1-11 As shown, this invention discloses a continuous device for coating and carbonizing lithium battery negative electrode materials, including a feeding mechanism 1 for continuously receiving negative electrode materials. It should be noted that the negative electrode material can be carbon-based or silicon-based, or a composite of carbon-based and silicon-based materials. The carbon-based negative electrode material can be natural graphite, artificial graphite, hard carbon, or soft carbon, preferably artificial graphite. The carbon-based negative electrode material can be silicon nanowire material or porous silicon material. The carbon-based and silicon-based composite negative electrode material can be a graphite-silicon-hard carbon multiphase composite. A coating mechanism 2 is provided at the bottom of the feeding mechanism 1. The coating mechanism 2 is used to atomize the coating liquid and mix it with the negative electrode material. The coating liquid used by the coating mechanism 2 can be asphalt or resin, i.e., the coating liquid is prepared using asphalt or resin. The specific method is as follows:

[0033] The coating liquid mainly includes a coating agent, a solvent and an additive. The coating agent can be asphalt, phenolic resin, sucrose or PVDF. The solvent can be xylene, NMP, water or ethanol. The rotation of the solvent can be adjusted adaptively according to the type of the coating agent. The additive is used to improve the rheological property, dispersibility and adhesion of the coating agent. A surfactant (SDS) and a coupling agent (KH550) can be used.

[0034] Here, taking asphalt coating liquid as an example, the selected coating agent is medium temperature asphalt, the solvent is xylene or tetrahydrofuran, and the dispersant is polyvinylpyrrolidone (PVP). The mass fraction of the medium temperature asphalt is 10%-20%, the mass fraction of the solvent is 80%-90%, and the mass fraction of the dispersant is 0.1%-0.5%. The specific proportions of the medium temperature asphalt, the solvent and the dispersant can be increased or decreased by a person skilled in the art according to the actual situation.

[0035] First, the medium temperature asphalt is crushed into small pieces and added to the solvent. Stirring is performed at 60-80°C for 2-4 hours until complete dissolution.

[0036] Second, polyvinylpyrrolidone is added, and ultrasonic treatment (power 300W, 30 minutes) is performed to eliminate agglomeration.

[0037] Finally, impurities are removed through a 5μm filter to obtain a homogeneous coating liquid.

[0038] The bottom of the coating mechanism 2 is provided with a carbonization furnace 3 for continuously carbonizing the negative electrode material, the temperature range of the carbonization furnace 3 is 600-1200℃, the carbonization furnace 3 can be divided into two heating intervals, the first heating interval is 300-600℃, and the second heating interval is 600-1200℃, or it can be divided into multiple intervals, which is adjusted by the person skilled in the art according to the specification of the carbonization furnace 3, and the bottom of the carbonization furnace 3 is provided with a cooling mechanism 4 for continuously cooling the carbonized negative electrode material, which needs to be cooled to below 60℃ to prevent the carbonized negative electrode material from reacting with oxygen in the air, and the cooling mechanism 4 is provided with a linkage driving mechanism 5 at the joint of the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4, which provides driving force for the carbonization furnace 3 and the cooling mechanism 4, so that the negative electrode material is continuously transported between the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4, and it should be noted that the cooling mechanism 4 also introduces inert gas while cooling the negative electrode material, which can be nitrogen or argon, preferably nitrogen, which is introduced into the inside of the cooling mechanism 4, exchanges heat with the negative electrode material in the cooling mechanism 4, increases the temperature of the nitrogen, and enters the carbonization furnace 3, and finally is transported to the coating mechanism 2 by the carbonization furnace 3, which increases the temperature in the coating mechanism 2, and controls the temperature in the coating mechanism 2 to 200-300℃ by controlling the flow rate of nitrogen, and the nitrogen also carries out the exhaust gas formed by carbonization in the carbonization furnace 3 when passing through the carbonization furnace 3, and finally the high-temperature nitrogen and exhaust gas are discharged through the feeding mechanism 1, and it should be noted that the exhaust gas needs to be treated during the process of discharging the high-temperature nitrogen and exhaust gas to ensure that the discharged gas meets the emission standard, and since the nitrogen is always introduced into the carbonization furnace 3 and the coating mechanism 2 through the cooling mechanism 4, the internal environment of the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4 can be kept in an overpressure state to prevent oxygen in the external environment from entering the internal environment of the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4, so that the internal environment of the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4 is in an oxygen-free environment, preventing the carbonized negative electrode material from being oxidized, and the linkage driving mechanism 5 not only provides power for the carbonization furnace 3 and the cooling mechanism 4, but also provides power for the input of nitrogen, so that the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4 only need one set of drive to complete the continuous coating and carbonization treatment of the negative electrode material, greatly reducing the cost of continuous coating and carbonization treatment of the negative electrode material.

[0039] As an embodiment of the present application, as shown in Figure 3 and Figure 4 The feeding channel 11 is connected with a conveying belt 12 at one end, Figure 3 and Figure 4The length of the conveying belt 12 in the figure is exaggerated, and the specific length of the conveying belt 12 is adaptively selected by a person skilled in the art according to the height of the feeding channel 11 and the distance from the negative material providing position, and the conveying belt 12 can also be replaced by a screw feeder. The inside of the feeding channel 11 is provided with a feeding impeller 13 through bearing installation. One side of the feeding impeller 13 is coaxially connected with a worm gear 16 after penetrating through the feeding channel 11. The side surface of the worm gear 16 is engaged with a worm 15. One end of the worm 15 is provided with a motor 14. The motor 14 is fixed on the side surface of the feeding channel 11 through bolts. The output shaft of the motor 14 is fixedly connected with the end of the worm 15. In use, the motor 14 can drive the worm 15 to rotate through the output shaft. The rotating worm 15 can drive the worm gear 16. The worm gear 16 drives the feeding impeller 13 to rotate. The rotating speed of the worm gear 16 can be indirectly controlled by controlling the rotating speed of the motor 14. The rotating speed of the feeding impeller 13 is directly controlled by the worm gear 16. The amount of negative material fed to the coating mechanism 2 is controlled according to the rotating speed of the feeding impeller 13. It should be noted that the feeding impeller 13 is matched with the inner cavity of the feeding channel 11 to prevent the gas in the coating mechanism 2 from leaking out through the gap between the feeding impeller 13 and the feeding channel 11.

[0040] As one embodiment of the present application, as shown in Figures 1-11 The coating mechanism 2 includes a coating tower 21. The bottom end of the coating tower 21 is fixedly connected with a discharge port 22. The bottom end of the coating tower 21 is fixedly connected with a liquid storage tank 23 on one side. The top end of the liquid storage tank 23 is fixedly connected with a liquid conveying pipeline 24. The end of the liquid conveying pipeline 24 away from the liquid storage tank 23 is fixedly connected with the side surface of the coating tower 21. The top side surface of the coating tower 21 is provided with a pressure relief exhaust pipe 25. The inside of the pressure relief exhaust pipe 25 is provided with a pressure relief valve. The inside of the pressure relief exhaust pipe 25 is directly connected with the inside space of the coating tower 21 to ensure that the gas in the coating tower 21 can be discharged through the pressure relief exhaust pipe 25. The gas pressure in the inside space of the coating tower 21 is controlled through the pressure relief valve installed in the pressure relief exhaust pipe 25. The working range of the pressure relief valve is adaptively selected by a person skilled in the art according to the actual situation of the coating tower 21 and the carbonization furnace 3. It should be noted that the liquid storage tank 23 stores the coating liquid. The inside of the coating tower 21 is provided with a sprayer corresponding to the liquid conveying pipeline 24. The sprayer can uniformly spray the coating liquid into the inside of the coating tower 21. In this way, when the negative material enters the coating tower 21, it will be mixed with the misty coating liquid in the coating tower 21, realizing the coating operation of the coating liquid on the negative material. The coated negative material will fall into the discharge port 22 under the action of gravity.

[0041] As one embodiment of the present application, as shown in Figures 1-11As shown, the inside of the carbonization furnace 3 is provided with a carbonization cylinder 31, the bottom of the carbonization cylinder 31 is fixedly connected with a base 34, one end of the carbonization furnace 3 is provided with a feeding pipe 33 near the discharging port 22, the other end of the carbonization furnace 3 is connected with a sealing end cover 32, and it should be noted that the discharging port 22 and the feeding pipe 33 are sealingly connected by bolts, so that the negative electrode material entering the discharging port 22 can enter the carbonization cylinder 31 to perform carbonization operation, and the heating mode of the carbonization furnace 3 can be resistance heating, gas heating, microwave heating or infrared radiation heating, and the temperature inside the carbonization cylinder 31 can be heated to 600-1200℃.

[0042] As an embodiment of the present application, as shown in Figures 1-11 As shown, the carbonization cylinder 31 comprises a cylinder body 311, the inside of the cylinder body 311 is provided with a carbonization cavity 312, the inner wall of the carbonization cavity 312 is fixedly connected with a first spiral blade 313, the side surface of one end of the cylinder body 311 is nested with a driving gear ring 314, and the side surface of the other end of the cylinder body 311 is nested with a rolling bearing 315, and it should be noted that when the cylinder body 311 rotates, the negative electrode material entering the inside of the carbonization cavity 312 will slowly move in the inside of the carbonization cavity 312 under the action of the first spiral blade 313, and the high temperature in the inside of the carbonization cavity 312 can heat the negative electrode material, and a supporting seat is arranged inside the carbonization furnace 3 near the driving gear ring 314 and the rolling bearing 315, so that the carbonization cylinder 31 can freely rotate in the inside of the carbonization furnace 3.

[0043] As an embodiment of the present application, as shown in Figures 1-11 As shown, the cooling mechanism 4 comprises a cooling cylinder 41, the inside of the cooling cylinder 41 is provided with a driving screw 42, one end top of the cooling cylinder 41 is fixedly connected with the sealing end cover 32, one end bottom of the cooling cylinder 41 is connected with a water inlet port 43, and the other end top of the cooling cylinder 41 is connected with a water outlet port 44, and it should be noted that the cooling cylinder 41 can receive the negative electrode material in the inside of the carbonization cylinder 31 through the sealing end cover 32, the end of the water inlet port 43 away from the cooling cylinder 41 is connected with a cold water tank through a pipeline, a water pump is arranged in the inside of the cold water tank, cold water can be delivered to the water inlet port 43 through the pipeline, the water inlet port 43 delivers the cold water to the inside of the cooling cylinder 41 to perform water cooling operation on the negative electrode material in the inside of the cooling cylinder 41 to reduce the temperature of the negative electrode material, the cold water entering the inside of the cooling cylinder 41 is discharged through the water outlet port 44, the end of the water outlet port 44 away from the cooling cylinder 41 is connected with the cold water tank through a pipeline, so that the cold water can return to the cold water tank through the water outlet port 44, realizing the recycling of the cold water, and the length of the pipeline between the water outlet port 44 and the cold water tank is adaptively selected by the person skilled in the art according to the cooling speed of the cold water, so that the water output through the water outlet port 44 can be naturally cooled to below 60℃ before entering the cold water tank after passing through the pipeline between the water outlet port 44 and the cold water tank.

[0044] As one of the embodiments of the present application, as shown in Figures 1-11 The inside of the cooling cylinder 41 is provided with a cooling cavity 411 and a water cooling cavity 413 nested outside the cooling cavity 411, the inside of the water cooling cavity 413 is provided with a second spiral blade 414, the water inlet port 43 and the water outlet port 44 are both connected with the water cooling cavity 413, one end of the inside of the cooling cavity 411 is provided with a feeding port 412, the feeding port 412 is sealingly connected with the bottom end of the sealing end cover 32, and it should be noted that the cooling cavity 411 and the water cooling cavity 413 are not connected with each other, and the second spiral blade 414 arranged in the inside of the water cooling cavity 413 can greatly increase the length of the cold water flowing in the water cooling cavity 413, that is, increase the contact time of the cold water with the outside surface of the cooling cavity 411, so as to ensure that the heat in the cooling cavity 411 can exchange with the cold water in the water cooling cavity 413, and since the feeding port 412 is sealingly connected with the bottom end of the sealing end cover 32, the negative electrode material in the inside of the sealing end cover 32 can directly enter the cooling cavity 411 through the feeding port 412.

[0045] As one of the embodiments of the present application, as shown in Figures 1-11 The driving screw 42 includes a driving shaft 421, one end of the driving shaft 421 is fixedly connected with a driving gear 422, and the side surface of the driving shaft 421 is fixedly connected with a third spiral blade 423, and the third spiral blade 423 is provided with a gas conveying groove 424, and it should be noted that the driving screw 42 can be arranged in the inside of the cooling cavity 411 and matched with the inner wall of the cooling cavity 411, when the driving screw 42 rotates, that is, the driving shaft 421 rotates, the third spiral blade 423 fixedly connected with the side surface of the driving shaft 421 can transport the negative electrode material entering the inside of the cooling cavity 411 in the process of the rotation of the driving screw 42, so as to transport the negative electrode material from one end of the cooling cavity 411 to the other end, and in this process, the cooling cavity 411 can realize the cooling treatment of the negative electrode material, so as to ensure that the temperature of the negative electrode material is reduced to below 60°C, and the nitrogen gas in the gas conveying groove 424 of the third spiral blade 423 can be conveyed from one end of the cooling cavity 411 to the other end, when the nitrogen gas enters the inside of the cooling cavity 411, the nitrogen gas can be conveyed through the gas conveying groove 424 on one hand, and on the other hand, the nitrogen gas can also absorb the heat of the negative electrode material in the cooling cavity 411, so that when entering the carbonization furnace 3, the temperature is increased to form high-temperature nitrogen gas, thereby improving the utilization rate of heat and reducing the load of the carbonization furnace 3.

[0046] As one of the embodiments of the present application, as shown in Figures 1-11As shown, the linkage driving mechanism 5 comprises a driving motor 51, one end of the driving motor 51 is connected with a screw rod cylinder 52, the side top end of the screw rod cylinder 52 is fixedly connected with a butt joint pipeline 53, a transmission box 54 is arranged between the driving motor 51 and the screw rod cylinder 52, the bottom side of the transmission box 54 is connected with a transmission rod 55, one end of the transmission rod 55 away from the transmission box 54 is fixedly connected with a transmission gear 56, the side of the transmission rod 55 is nested with a fan impeller box 58, the side of the transmission rod 55 between the transmission gear 56 and the fan impeller box 58 is nested with a fixed bearing seat 57, the top of the fixed bearing seat 57 is fixedly connected with the side surface of the cylinder body 311, it should be noted that the specification and type of the driving motor 51 are adaptively selected by the person skilled in the art according to the volume of the coating mechanism 2, the carbonization furnace 3 and the cooling mechanism 4, so that the driving motor 51 can provide sufficient power, and at the same time, the driving motor 51 can be under rated power, so as to ensure the stability of the driving motor 51, the screw rod cylinder 52 comprises a cylinder and a screw rod, one end of the screw rod is fixedly connected with the output shaft of the driving motor 51 through a shaft coupling, so that the power of the driving motor 51 can be transmitted to the screw rod through the output shaft after the driving motor 51 is turned on, and the rotating screw rod can transport the negative electrode material entering the cylinder through the butt joint pipeline 53, one end of the cylinder extends into the inside of the carbonization cavity 312, so that the cylinder can continuously transport the negative electrode material to the inside of the carbonization cavity 312 under the work of the screw rod, the number, specification and position of the gears in the transmission box 54 are adaptively selected by the person skilled in the art according to the volume of the transmission box 54, so that the output shaft of the driving motor 51 can transmit power to the transmission rod 55.

[0047] As one embodiment of the present application, as Figures 1-11As shown, the outer end of the cooling cavity 411 is fixedly connected with a docking cylinder 45, the end of the docking cylinder 45 away from the cooling cavity 411 is fixedly connected with an air inlet pipeline 46, the bottom of the docking cylinder 45 is provided with a discharging passage 47, the fan impeller box 58 is arranged on the side of the air inlet pipeline 46, the bottom of the transmission gear 56 is engaged with the driving gear 422, and the top of the transmission gear 56 is engaged with the driving gear ring 314 through a gear. It should be noted that, since the outer end of the cooling cavity 411 is fixedly connected with the docking cylinder 45, when the cooling cavity 411 transports the negative electrode material to the inside of the docking cylinder 45, the negative electrode material entering the inside of the docking cylinder 45 is collected through the discharging passage 47. Since the bottom of the transmission gear 56 is engaged with the driving gear 422, when the transmission rod 55 rotates, the transmission rod 55 drives the driving gear 422 to rotate through the transmission gear 56, and the rotating driving gear 422 drives the third spiral blade 423 to rotate through the driving shaft 421, thereby achieving the transportation function of the negative electrode material in the cooling cavity 411. Since the top of the transmission gear 56 is engaged with the driving gear ring 314 through a gear, when the transmission gear 56 rotates, the transmission gear 56 can drive the driving gear ring 314 to rotate through the gear, the rotating driving gear ring 314 can drive the cylinder body 311 to rotate, and the rotating cylinder body 311 can achieve the transportation function of the negative electrode material in the carbonization cavity 312 through the cooperation of the first spiral blade 313.

[0048] In addition, it should be noted that the fan impeller box 58 is nested on the side of the transmission rod 55, which can control the operation of the air inlet pipeline 46. The end of the air inlet pipeline 46 away from the docking cylinder 45 is connected with a nitrogen cylinder through a pipeline, so that nitrogen can be continuously provided to the air inlet pipeline 46. The fan impeller box 58 is selected by a person skilled in the art according to the specifications of the air inlet pipeline 46 to ensure that the fan impeller box 58 can transport the nitrogen in the air inlet pipeline 46 to the inside of the docking cylinder 45. The docking cylinder 45 transports the nitrogen to the inside of the cooling cavity 411. When the nitrogen enters the inside of the cooling cavity 411, it exchanges heat with the negative electrode material in the cooling cavity 411, so that the nitrogen entering the inside of the cooling cavity 411 forms high-temperature nitrogen. The high-temperature nitrogen finally enters the inside of the carbonization cylinder 31 through the sealing end cover 32. The high-temperature nitrogen in the carbonization cylinder 31 can carry away the waste gas formed by carbonization of the negative electrode material in the carbonization cylinder 31. Then, the high-temperature nitrogen and the waste gas enter the inside of the coating tower 21, so that a certain air pressure is formed in the inside of the coating tower 21 (the size of the air pressure is determined by the pressure relief valve arranged in the pressure relief exhaust pipe 25). This prevents oxygen in the external environment from entering the inside of the coating tower 21 and also prevents oxygen in the external environment from entering the carbonization cylinder 31 and the cooling cylinder 41, thereby achieving the oxygen-free carbonization operation of the negative electrode material.

[0049] The above has been described in detail one embodiment of the present application, but the content is only the preferred embodiment of the present application, cannot be considered for limiting the scope of the present application. Any equivalent changes and improvements made in the scope of the present application, should still belong to the scope of the present application.

Claims

1. A continuous apparatus for carbonizing and coating lithium battery anode materials, characterized in that, include: Feeding mechanism (1), which is used to continuously receive negative electrode material; The coating mechanism (2) is located at the bottom of the feeding mechanism (1) and is used to atomize the coating liquid and mix it with the negative electrode material. A carbonization furnace (3) is set at the bottom of the coating mechanism (2). The carbonization furnace (3) is used for continuous carbonization of negative electrode materials. Cooling mechanism (4) is located at the bottom of carbonization furnace (3). Cooling mechanism (4) is used to continuously cool the carbonized negative electrode material. The linkage drive mechanism (5) is set at the junction of the coating mechanism (2), the carbonization furnace (3) and the cooling mechanism (4). The linkage drive mechanism (5) provides driving force to both the carbonization furnace (3) and the cooling mechanism (4), so that the negative electrode material is continuously transported between the coating mechanism (2), the carbonization furnace (3) and the cooling mechanism (4).

2. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 1, characterized in that, The feeding mechanism (1) includes a feeding channel (11), one end of which is connected to a conveyor belt (12), and a feeding impeller (13) is installed inside the feeding channel (11) via a bearing.

3. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 1, characterized in that, The coating mechanism (2) includes a coating tower (21), a discharge port (22) is fixedly connected to the bottom end of the coating tower (21), a liquid storage tank (23) is fixedly connected to one side of the bottom end of the coating tower (21), a liquid delivery pipe (24) is fixedly connected to the top end of the liquid storage tank (23), and the end of the liquid delivery pipe (24) away from the liquid storage tank (23) is fixedly connected to the side of the coating tower (21). A pressure relief and exhaust pipe (25) is installed on the top side of the coating tower (21).

4. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 3, characterized in that, The carbonization furnace (3) is equipped with a carbonization cylinder (31) inside. A feed pipe (33) is installed at one end of the carbonization furnace (3) near the discharge port (22), and a sealing end cap (32) is connected to the other end of the carbonization furnace (3).

5. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 4, characterized in that, The carbonization cylinder (31) includes a cylinder body (311), a carbonization chamber (312) is provided inside the cylinder body (311), a first spiral blade (313) is fixedly connected to the inner wall of the carbonization chamber (312), a drive gear ring (314) is nested on the side of one end of the cylinder body (311), and a rolling bearing (315) is nested on the side of the other end of the cylinder body (311).

6. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 4, characterized in that, The cooling mechanism (4) includes a cooling cylinder (41), a drive screw (42) is provided inside the cooling cylinder (41), the top of one end of the cooling cylinder (41) is fixedly connected to the sealing end cap (32), the bottom of one end of the cooling cylinder (41) is connected to a water inlet port (43), and the top of the other end of the cooling cylinder (41) is connected to a water outlet port (44).

7. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 6, characterized in that, The cooling cylinder (41) has a cooling chamber (411) inside and a water-cooled chamber (413) nested outside the cooling chamber (411). The water-cooled chamber (413) has a second spiral blade (414) inside. The water inlet port (43) and the water outlet port (44) are both connected to the water-cooled chamber (413). The cooling chamber (411) has a feed port (412) at one end of its inner side. The feed port (412) is sealed to the bottom end of the sealing end cap (32).

8. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 7, characterized in that, The drive screw (42) includes a drive shaft (421), one end of which is fixedly connected to a drive gear (422), and a third spiral blade (423) is fixedly connected to the side of the drive shaft (421). An air delivery groove (424) is provided on the third spiral blade (423).

9. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 8, characterized in that, The linkage drive mechanism (5) includes a drive motor (51), one end of which is connected to a screw cylinder (52). A docking pipe (53) is fixedly connected to the top side of the screw cylinder (52). A transmission box (54) is provided between the drive motor (51) and the screw cylinder (52). A transmission rod (55) is connected to the bottom side of the transmission box (54). A transmission gear (56) is fixedly connected to the end of the transmission rod (55) away from the transmission box (54). A fan impeller box (58) is nested on the side of the transmission rod (55).

10. The continuous carbonization apparatus for lithium battery negative electrode material coating according to claim 9, characterized in that, A docking cylinder (45) is fixedly connected to one end of the outer side of the cooling chamber (411). An air inlet pipe (46) is fixedly connected to the end of the docking cylinder (45) away from the cooling chamber (411). A discharge channel (47) is opened at the bottom of the docking cylinder (45). The fan impeller box (58) is set on the side of the air inlet pipe (46). The bottom of the transmission gear (56) meshes with the drive gear (422). The top of the transmission gear (56) meshes with the drive gear ring (314) through a gear.

Images