Battery negative electrode material pre-carbonization production line

Abstract

The application discloses a battery negative material pre-carbonization production line, which comprises a heating furnace body, a cylinder, a feeding device, a discharging device, a cylinder driving device and a nitrogen protection system. The heating furnace body is internally provided with heating elements. The cylinder is arranged in the heating furnace body and rotationally connected with the heating furnace body, and both ends of the cylinder extend out of the heating furnace body. The feeding device is arranged at one end of the cylinder and used for adding materials into the cylinder. The discharging device is arranged at the other end of the cylinder and used for discharging the materials in the cylinder after roasting. The cylinder driving device is used for driving the cylinder to rotate relative to the heating furnace body. The nitrogen protection system is used for filling nitrogen into the cylinder. The heating furnace body is divided into multiple regions from one end of the feeding device to the other end of the discharging device, and the temperature of the multiple regions gradually increases. The application has the beneficial effect that the temperature in the cylinder gradually increases with the forward conveying of the materials, thereby improving the roasting quality of the materials.

Description

Technical Field

[0001] The invention relates to a pre-carbonization production line for battery negative electrode materials, belonging to the technical field of heat treatment equipment. Background Art

[0002] As a new energy battery, lithium battery is widely used in the field of new energy vehicles and various means of transportation. In the preparation of lithium battery negative electrode materials, pre-carbonization is an extremely important step. The pre-carbonization of battery negative electrode materials is completed on the pre-carbonization production line.

[0003] The Chinese invention patent application document with application publication number CN114111324A discloses an electrically heated negative electrode material sintering rotary kiln, which can be used for the pre-chemical treatment of battery negative electrode materials. The kiln includes a feeding mechanism, a sintering furnace, a furnace drum slow cooling and temperature reduction device, a discharging device and a first protective atmosphere generating device. The sintering furnace includes more than one sintering furnace unit and a roller driving device. The sintering furnace unit includes a heating furnace body, a furnace roller and a heater. The furnace rollers of two adjacent sintering furnace units are connected at one end facing each other. The rear end of the furnace roller of the last sintering furnace unit passes through the furnace drum slow cooling and temperature reduction device. The discharging device is arranged behind the furnace drum slow cooling and temperature reduction device. The rear end of the furnace roller of the last sintering furnace unit extends into the discharging device. The temperature of the furnace roller of the entire sintering furnace gradually increases from front to back, and the first protective atmosphere generating device extends into the furnace roller from the discharging device.

[0004] The above patent has the following defects: First, there is no temperature difference in the furnace in the above patent. After the material enters the furnace, the temperature rises rapidly instead of gradually. The large temperature change of the material inside and outside the furnace makes it difficult to effectively improve the roasting quality of the battery negative electrode material; secondly, since the roasting of the battery negative electrode material needs to be carried out in an environment isolated from oxygen, the above patent is provided with a nitrogen protection system. By introducing nitrogen into the furnace, a nitrogen atmosphere is generated in the furnace, so that the material is roasted in a nitrogen atmosphere. The nitrogen protection system is directly introduced into the interior of the furnace through a pipeline. Before the roasting starts, nitrogen is first introduced into the interior of the furnace until All the air in the furnace is emptied and the furnace is filled with nitrogen. During the roasting process, nitrogen needs to be continuously charged into the furnace to ensure the pressure in the furnace. The above-mentioned nitrogen protection system cannot adjust the nitrogen charged into the furnace before and after roasting. If the nitrogen is charged too quickly during the roasting process, the heat in the furnace will be taken out quickly, affecting the roasting temperature in the furnace, thereby affecting the roasting quality of the battery negative electrode material; thirdly, in order to reduce the temperature of the discharge material, the above-mentioned patent sets up a single-drum cooler, which only uses the method of spraying cold water on the cooling drum to cool the material. Its cooling effect is limited and it cannot cool the material better. Summary of the Invention

[0005] The purpose of the present invention is to provide a battery negative electrode material pre-carbonization production line to solve the technical defect in the prior art that when the cylinder of the battery negative electrode material pre-carbonization production line conveys materials, the temperature of the material in the cylinder changes rapidly due to the lack of temperature difference, resulting in poor roasting quality.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is: a battery negative electrode material pre-carbonization production line, including a heating furnace body, a cylinder, a feeding device, a discharging device, a cylinder driving device and a nitrogen protection system; a heating element is provided in the heating furnace body; the cylinder is provided in the heating furnace body and is rotatably connected to the heating furnace body, and both ends of the cylinder extend from the heating furnace body; the feeding device is provided at one end of the cylinder body for adding materials into the cylinder body; the discharging device is provided at the other end of the cylinder body for outputting the materials that have been roasted in the cylinder body; the cylinder driving device is used to drive the cylinder body to rotate relative to the heating furnace body; the nitrogen protection system is used to fill nitrogen into the cylinder body; the heating furnace body is divided into multiple areas from one end of the feeding device to one end of the discharging device, and the temperature of the multiple areas gradually increases. The present invention divides the area into zones in the cylinder body, and makes the temperature of each zone increase with the transportation of the material in the heating furnace body, so that the temperature of the material gradually increases and the roasting is completed. Compared with the existing technology, the present invention effectively improves the roasting quality of the material.

[0007] As a further improvement of the present invention, the nitrogen protection system is connected to the on-site pipeline, which includes a main pipeline, a branch pipeline A and a branch pipeline B, one end of branch pipeline A and branch pipeline B is connected to the main pipeline at the same time, and the other ends of branch pipeline A and branch pipeline B are merged into one path and connected to the nitrogen protection system, wherein valve A is provided on branch pipeline A, valve B and valve C are provided on branch pipeline B, and a flow meter is installed between valve B and valve C. The nitrogen in the main pipeline is divided into two paths by branch pipeline A and branch pipeline B, and then merged into one path by branch pipeline A and branch pipeline B to enter the nitrogen protection system, wherein valve A is used to control the on and off of branch pipeline A, valve B and valve C are used to control the on and off of branch pipeline B, and the flow meter is used to measure the amount of nitrogen passing through branch pipeline B. According to the present invention, before the material is roasted, nitrogen can be simultaneously passed into the cylinder through the branch pipe A and the branch pipe B to accelerate the speed of exhausting the air in the cylinder. After the roasting begins, since the air in the cylinder has been exhausted and is in a nitrogen atmosphere, the speed of passing nitrogen into the cylinder can be reduced to reduce the energy loss due to the high air flow speed in the cylinder. According to the present invention, nitrogen can be passed into the cylinder only through the branch pipe B, and the amount of the passed nitrogen can be detected by a flow meter.

[0008] As a further improvement of the present invention, it also includes a single-cylinder cooler, which includes a cooling cylinder, a spray chamber, a cooling drive device and a spray device. Spiral blades are arranged in the cooling cylinder for conveying materials. The cooling cylinder includes cylindrical cooling unit A, cooling unit B and cooling unit C. Cooling unit A and cooling unit C are respectively located at both ends of cooling unit B and the three are coaxially arranged. The diameters of cooling unit A and cooling unit C are smaller than the diameter of cooling unit B. Cooling unit B is located in the spray chamber. Cooling unit A and cooling unit C extend out of the spray chamber from both ends of the spray chamber respectively and are rotatably connected to a cooling frame outside the spray device. The cooling drive device is connected to the cooling unit A or the cooling unit C for driving the cooling cylinder to rotate. The spray device is arranged in the spray chamber for spraying coolant onto the cooling unit B. A water pool is arranged at the bottom of the spray chamber. The part of the cooling unit B located below is immersed in the water pool. A drainage device is provided at the lower part of the spray device for discharging the cooling water in the water pool. In the present invention, the material after roasting treatment passes through a single-drum cooler, and cooling water is sprayed onto the cooling drum by a spray device in the spray chamber to reduce the temperature of the cooling drum. By reducing the temperature of the cooling drum, the temperature of the material therein is reduced. The setting of the spray chamber and the water pool in the present invention can effectively ensure the working environment of the present invention.

[0009] As a further improvement of the present invention, the present invention further includes a plurality of cooling water pipes, each of which passes through the cooling unit B at both ends and communicates with the spray chamber. When the cooling water pipe rotates with the cooling unit B to be located at the bottom of the cooling unit B and immersed in the water pool, the cooling water in the water pool flows into the cooling water pipe from both ends to reduce the temperature of the material in the cooling unit B. When the cooling water pipe rotates with the cooling unit B to be moved out of the water pool, the cooling water in the cooling water pipe flows out from both ends of the cooling water pipe. The present invention provides a plurality of cooling water pipes in the cooling unit B. Since the ends of the cooling water pipes are open, when the cooling water pipe rotates with the cooling unit B to be immersed in the water pool, the water in the water pool can flow into the cooling water pipe from the ends of the cooling water pipe to reduce the temperature of the material in the cooling unit B. When the cooling water pipe moves upward and out of the water pool, the cooling water in the cooling water pipe flows toward both ends and flows out from the ends of the cooling water pipe to be ready for cooling water to flow in the next time the cooling water pipe is immersed in the water pool.

[0010] As a further improvement of the present invention, the cooling water pipe passes through the spiral blades within cooling unit B and is fixedly connected to the spiral blades. In the present invention, the cooling water pipe is fixed to the spiral blades, which enhances the strength of the cooling water pipe and prevents the cooling water pipe from bending and deforming during use, thereby preventing the cooling water from flowing into the cooling water pipe, thereby maintaining the cooling effect of the present invention.

[0011] As a further improvement of the present invention, the spray device includes a spray pipe and multiple nozzles. The spray pipe extends into the spray chamber and is located above cooling unit B. The nozzles are installed on the spray pipe at intervals, with the water outlets of the nozzles facing downward. The spray pipe in the present invention is used to pass cooling water into the spray chamber. The nozzles spray the cooling water in the spray pipe onto cooling unit B. The spraying of the multiple nozzles makes the cooling water on cooling unit B more evenly distributed, thereby improving the cooling effect of the material.

[0012] In summary, the beneficial effects of the present invention are as follows: the temperature in the cylinder of the present invention increases successively as the material is transported forward, thereby improving the roasting quality of the material; the present invention quickly introduces nitrogen before roasting to provide a nitrogen roasting atmosphere; after the roasting begins, the amount of nitrogen introduced can be effectively reduced, and the present invention can effectively reduce the temperature of the final material. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the present invention.

[0014] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0015] Figure 3 Figure 1 I-direction view.

[0016] Figure 4 It is a top view of the present invention.

[0017] Among them: 1. Heating furnace body; 2. Cylinder; 3. Feeding device; 4. Discharging device; 5. Cylinder driving device; 6. Nitrogen protection system; 7. Main line; 8. Branch line A; 9. Branch line B; 10. Valve A; 11. Valve B; 12. Valve C; 13. Flow meter; 14. Single-cylinder cooler; 15. Cooling cylinder; 16. Spray chamber; 17. Cooling driving device; 18. Spray device; 19. Spiral blade; 20. Cooling unit A; 21. Cooling unit B; 22. Cooling unit C; 23. Cooling rack; 24. Water tank; 25. Drainage device; 26. Cooling water pipe; 27. Spray water pipe; 28. Copy board. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0019] like Figures 1 to 4The battery negative electrode material pre-carbonization production line shown in the figure includes a heating furnace body 1, a cylinder body 2, a feeding device 3, a discharging device 4, a cylinder driving device 5 and a nitrogen protection system 6; the present invention is provided with a heating element in the heating furnace body 1 for heating the cylinder body 2 in the heating furnace body 1; the cylinder body 2 in the present invention is arranged in the heating furnace body 1 and is rotatably connected to the heating furnace body 1, and both ends of the cylinder body 2 extend from the heating furnace body 1; the feeding device 3 in the present invention is arranged at one end of the cylinder body 2 for adding the material to be roasted into the cylinder body 2; the discharging device 4 in the present invention is arranged at the other end of the cylinder body 2 for outputting the material that has passed through the cylinder body 2. calcined material; the cylinder driving device 5 of the present invention is used to drive the cylinder 2 to rotate relative to the heating furnace body 1, and a shoveling plate 28 is provided in the cylinder 2. When the cylinder 2 rotates, the shoveling plate 28 cooperates with the cylinder 2 to realize the conveying of the material; the nitrogen protection system 6 of the present invention is provided at one end of the discharge device 4 for filling nitrogen into the cylinder 2. The structures of the heating furnace 1, the cylinder 2, the feeding device 3, the discharge device 4, the cylinder driving device 5 and the nitrogen protection system 6 of the present invention are all prior art, specifically disclosed in the Chinese invention patent application with application publication number CN114111324A, and will not be described in detail in the present invention. The heating furnace body 1 in the present invention is divided into multiple zones from one end of the feeding device 3 to one end of the discharging device 4, and the temperatures of the multiple zones gradually increase. The present invention preferably divides the heating furnace body 1 from the feeding device 3 to the discharging device 4 into twelve zones at equal intervals, namely the first zone, the second zone,..., the twelfth zone, and the temperatures from the first zone to the twelfth zone increase successively. The present invention realizes the above-mentioned temperature increase by changing the heating elements in each zone, such as increasing the number of heating elements to achieve temperature increase, or changing the temperature by changing the power of the heating elements in each zone, etc. The heating elements in the present invention are preferably electric heaters, and the temperature increase in each of the above-mentioned zones is achieved by increasing the power of the electric heaters.

[0020] The nitrogen protection system 6 in the application is connected with the field pipeline, which includes the main pipeline 7, the branch pipeline A 8 and the branch pipeline B 9. One end of the branch pipeline A 8 and the branch pipeline B 9 is connected with the main pipeline 7 simultaneously. The nitrogen in the main pipeline 7 can be respectively passed into the nitrogen protection system 6 through the branch pipeline A 8 and the branch pipeline B 9. The application is connected with the nitrogen protection system 6 in one way at the other end of the branch pipeline A 8 and the branch pipeline B 9. The valve A 10 is arranged on the branch pipeline A 8. The valve B 11 and the valve C 12 are arranged on the branch pipeline B 9. The flow meter 13 is installed between the valve B 11 and the valve C 12. The nitrogen in the main pipeline 7 is divided into two ways by the branch pipeline A 8 and the branch pipeline B 9, and then is passed into the nitrogen protection system 6 in one way by the branch pipeline A 8 and the branch pipeline B 9. The valve A 10 is used to control the on-off of the branch pipeline A 8. The valve B 11 and the valve C 12 are used to control the on-off of the branch pipeline B 9. The flow meter 13 is used to measure the amount of the nitrogen passing through the branch pipeline B 9. Before the material is roasted, the air in the cylinder 2 is excluded. At the same time, the valve A 10, the valve B 11 and the valve C 12 are opened. The nitrogen is passed into the cylinder 2 through the branch pipeline A 8 and the branch pipeline B 9 simultaneously, so that the air in the cylinder 2 is excluded as soon as possible. During the roasting, the amount of the nitrogen passed into the cylinder 2 is reduced. At this time, the valve A 10 is closed, and the valve B 11 and the valve C 12 are opened. The nitrogen is passed into the cylinder 2 through the branch pipeline B 9 only. At the same time, the amount of the nitrogen passed into the cylinder 2 can be measured through the flow meter 13.

[0021] In order to reduce the temperature of the output material of the present application, the present application is provided with a single-cylinder cooling machine 14, which includes a cooling cylinder 15, a spraying chamber 16, a cooling driving device 17 and a spraying device 18. The helical blade 19 is welded and fixed in the cooling cylinder 15 for conveying the material. The cooling cylinder 15 includes the cylindrical cooling unit A 20, the cooling unit B 21 and the cooling unit C 22. The cooling unit A 20 and the cooling unit C 22 are respectively located at both ends of the cooling unit B 21 and are coaxially arranged. The structure of the cooling cylinder 15 in the present application is disclosed in the Chinese invention patent application with the application publication number CN114111324A, which is the prior art. The diameters of the cooling unit A 20 and the cooling unit C 22 are smaller than that of the cooling unit B 21. The cooling unit B 21 is located in the spraying chamber 16. The cooling unit A 20 and the cooling unit C 22 respectively extend out of the spraying chamber 16 from both ends of the spraying chamber 16 and are rotationally connected with the cooling rack 23 located outside the spraying device 18. The cooling driving device 17 is connected with the cooling unit A 20 or the cooling unit C 22 for driving the rotation of the cooling cylinder 15. The rotational connection mode of the cooling cylinder 15 with the cooling rack 23 and the structure of the cooling driving device 17 driving the cooling cylinder 15 in the present application are the same as those disclosed in the Chinese invention patent application with the application publication number CN114111324A. The present application will not be described in detail. The spraying device 18 in the present application is arranged in the spraying chamber 16 for spraying the cooling liquid onto the cooling unit B 21. The water tank 24 is arranged at the bottom of the spraying chamber 16. The cooling unit B 21 is immersed in the water tank 24. The drainage device 25 is arranged at the lower part of the spraying device 18 for draining the cooling water in the water tank 24 when there is too much cooling water in the water tank 24, so as to avoid the excessive cooling water flowing out of the spraying chamber 16 along the cooling unit A 20 and the cooling unit C 22.

[0022] The preferred embodiment of the present application is provided with a plurality of cooling water pipes 26, the length of the cooling water pipes 26 is slightly greater than the length of the cooling unit B21 and less than the length of the spraying device 18, the cooling water pipes 26 are arranged in the cooling unit B, the two ends of the cooling water pipes 26 respectively pass through the two ends of the cooling unit B21 and communicate with the spraying chamber 16, the plurality of cooling water pipes 26 in the present application are uniformly distributed along the circumferential direction with the center line of the cooling unit B21 as the center, when the cooling water pipes 26 rotate with the cooling unit B21 to be immersed in the water pool 24 at the lower part of the cooling unit B21, the two ends of the cooling water pipes 26 are immersed in the water pool 24, at this time, the cooling water in the water pool 24 flows into the cooling water pipes 26 from the two ends of the cooling water pipes 26, the cooling water exchanges heat with the cooling water pipes 26 to reduce the temperature of the cooling water pipes 26, and then the cooling water pipes 26 exchange heat with the material to reduce the temperature of the material in the cooling unit B21, when the cooling water pipes 26 rotate with the cooling unit B21 to be removed from the water pool 24, the cooling water in the cooling water pipes 26 flows out from the two ends of the cooling water pipes 26. The part of the cooling water pipes 26 in the present application located in the cooling unit B21 passes through the spiral blades 19 in the cooling unit B21 and is welded and fixed with the spiral blades 19 to improve the stability and strength of the cooling water pipes 26 and avoid deformation such as bending during use, the end of the cooling water pipes 26 in the present application is also welded and fixed with the cooling unit B21 to enhance the sealing performance of the connection between the cooling water pipes 26 and the cooling unit B and prevent the cooling water from entering the cooling unit B21.

[0023] The spraying device 18 in the present application includes a spraying water pipe 27 and a plurality of nozzles, the spraying water pipe 27 extends into the spraying chamber 16, the length direction of the spraying water pipe 27 is the same as the length direction of the cooling unit B21, that is, both are parallel, and the spraying water pipe 27 is located above the cooling unit B21, the nozzles are installed on the spraying water pipe 27 at equal intervals and the water outlet of the nozzles is downward, the water sprayed by the nozzles flows to the surface of the cooling unit B21 to reduce the temperature of the cooling unit B21, and the temperature of the material in the cooling unit B21 is reduced through the temperature reduction of the cooling unit B21, the cooling unit B21 in the present application cooperates with the cooling water pipes 26 to improve the cooling effect of the single-cylinder cooling machine 14 on the material.

[0024] The parts not particularly mentioned in the above description are all prior art or can be realized by prior art. Moreover, the specific implementation cases described in the present application are only the preferred implementation cases of the present application and are not used to limit the implementation range of the present application. That is, all equivalent changes and modifications made according to the content of the patent range of the present application should be regarded as the technical scope of the present application.

Claims

1. A battery negative electrode material pre-carbonization production line, comprising a heating furnace (1), a barrel (2), a feeding device (3), a discharging device (4), a barrel driving device (5), a nitrogen protection system (6) and a single barrel cooler (14); a heating element is provided in the heating furnace (1); the barrel (2) is provided in the heating furnace (1) and is rotatably connected to the heating furnace (1), with both ends of the barrel (2) extending from the heating furnace (1); the feeding device (3) is provided at one end of the barrel (2) for adding material into the barrel (2); the discharging device (4) is provided at the other end of the barrel (2) The end of the cylinder (2) is used to output the roasted material; the cylinder driving device (5) is used to drive the cylinder (2) to rotate relative to the heating furnace (1); the nitrogen protection system (6) is used to fill nitrogen into the cylinder (2); the heating furnace (1) is divided into multiple areas from one end of the feeding device (3) to one end of the discharging device (4), and the temperature of the multiple areas gradually increases; the single cylinder cooler (14) includes a cooling cylinder (15), a spray chamber (16), a cooling driving device (17) and a spray device (18), and a spiral blade (19) is provided in the cooling cylinder (15) for conveying the material. The cooling cylinder (15) includes a cylindrical cooling unit A (20), a cooling unit B (21) and a cooling unit C (22), the cooling unit A (20) and the cooling unit C (22) are respectively located at both ends of the cooling unit B (21) and are coaxially arranged, the diameters of the cooling unit A (20) and the cooling unit C (22) are smaller than the diameter of the cooling unit B (21), the cooling unit B (21) is located in the spray chamber (16), the cooling unit A (20) and the cooling unit C (22) extend out of the spray chamber (16) from both ends of the spray chamber (16), and are located in the spray chamber (16). The cooling rack (23) outside the device (18) is rotatably connected, the cooling drive device (17) is connected to the cooling unit A (20) or the cooling unit C (22) and is used to drive the cooling cylinder (15) to rotate. The spray device (18) is arranged in the spray chamber (16) and is used to spray the cooling liquid onto the cooling unit B (21). A water pool (24) is arranged at the bottom of the spray chamber (16). The portion of the cooling unit B (21) located below is immersed in the water pool (24). A drainage device (25) is arranged at the bottom of the spray device (18) and is used to discharge the cooling water in the water pool (24). The characteristics are: The invention also includes a plurality of cooling water pipes (26), which are evenly distributed along the circumferential direction with the center line of the cooling unit B (21) as the center. The two ends of the cooling water pipe (26) pass through the cooling unit B (21) and are connected to the spray chamber (16). When the cooling water pipe (26) rotates with the cooling unit B (21) to be located at the lower part of the cooling unit B (21) and immersed in the water pool (24), the cooling water in the water pool (24) flows into the cooling water pipe (26) from the two ends of the cooling water pipe (26) to reduce the temperature of the material in the cooling unit B (21). When the cooling water pipe (26) rotates with the cooling unit B (21) to be moved out of the water pool (24), the cooling water in the cooling water pipe (26) flows out from the two ends of the cooling water pipe (26). The cooling water pipe (26) passes through the spiral blade (19) in the cooling unit B (21) and is fixedly connected to the spiral blade (19).

2. The battery negative electrode material pre-carbonization production line according to claim 1, characterized in that: The nitrogen protection system (6) is connected to the on-site pipeline, which includes a main pipeline (7), a branch pipeline A (8) and a branch pipeline B (9). One end of the branch pipeline A (8) and the branch pipeline B (9) are connected to the main pipeline (7) at the same time, and the other ends of the branch pipeline A (8) and the branch pipeline B (9) are combined into one pipeline and connected to the nitrogen protection system (6), wherein a valve A (10) is provided on the branch pipeline A (8), a valve B (11) and a valve C (12) are provided on the branch pipeline B (9), and a valve B (11) and a valve C (12) are provided on the valve B ( A flow meter (13) is installed between valve A (11) and valve C (12). The nitrogen in the main line (7) is divided into two lines by branch line A (8) and branch line B (9), and then merged into one line by branch line A (8) and branch line B (9) to enter the nitrogen protection system (6). Valve A (10) is used to control the on-off of branch line A (8), valve B (11) and valve C (12) are used to control the on-off of branch line B (9), and flow meter (13) is used to measure the amount of nitrogen passing through branch line B (9).

3. The battery negative electrode material pre-carbonization production line according to claim 1, characterized in that: The spraying device (18) includes a spraying water pipe (27) and a plurality of spray heads. The spraying water pipe (27) extends into the spraying chamber (16), and the spraying water pipe (27) is located above the cooling unit B (21). The spray heads are installed on the spraying water pipe (27) at intervals, and the water outlets of the spray heads are downward.

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