Stirring device for lithium battery positive electrode material preparation and use method of stirring device

Abstract

The stirring device is applied to the technical field of lithium battery positive electrode burdening and comprises a shell and a bottom plate, a sealing barrel is fixedly connected to the lower portion of the shell, a partition plate is fixedly connected to the interior of the sealing barrel, a protective cover is fixedly connected to the lower portion of the partition plate, and the protective cover is fixedly connected to the lower portion of the partition plate. Two groups of protective covers are arranged, two groups of sliding grooves and two groups of mounting grooves are formed in the bottoms of the protective covers, third motors are fixedly connected in the mounting grooves, the output ends of the third motors are fixedly connected with screw rods, the screw rods are in threaded connection with sliding blocks, and the sliding blocks are fixedly connected with cover plates. Limiting grooves are formed in the side walls of the protective cover shells, the width of the limiting grooves is matched with the thickness of the cover plate, two sets of cameras are fixedly connected to the bottoms of the protective cover shells, and the cameras are located in the two sets of protective cover shells correspondingly.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery cathode material technology, specifically relating to a stirring device for lithium battery cathode material preparation and its usage method. Background Technology

[0002] The positive electrode slurry of a lithium-ion battery consists of active materials, PVDF, conductive agents, NMP, etc. The preparation of the positive electrode slurry involves a series of processes, including mixing, dissolving, and dispersing liquids with liquids and liquids with solids. This process is typically accompanied by changes in temperature, viscosity, and environment. In the positive electrode slurry, the dispersibility and uniformity of the particulate active materials directly affect the movement of lithium ions between the battery electrodes. Therefore, the mixing and dispersion of the positive electrode slurry is crucial in lithium-ion battery production. The quality of the slurry dispersion directly affects the quality of subsequent lithium-ion battery production and the performance of the final product.

[0003] However, current mixing devices require observation of the mixing status only after the entire mixing process is completed, or the mixing tank must be opened after each mixing stage to determine the subsequent mixing intensity and time. This process is complex and inefficient. Furthermore, most mixing devices for lithium battery cathode materials use vacuum mixing devices, which are divided into several mixing stages, including glue application, adding conductive agents, adding active materials, and adding solvents to adjust the slurry viscosity. If the mixing device is opened to observe the internal slurry condition at each stage before adding materials and installing the mixing device, it increases labor intensity and reduces mixing efficiency. Therefore, this solution provides a mixing device for lithium battery cathode materials and its usage method, which can monitor the mixing status inside the mixing tank, ensure the uniformity of slurry mixing, avoid frequently opening the mixing device to observe the mixing status, scraping the tank wall, and installing the mixing device, thereby improving mixing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a stirring device for lithium battery cathode material preparation and its usage method, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a stirring device for lithium battery cathode material preparation and its usage method, comprising a shell and a base plate, an anti-slip pad provided on the upper part of the base plate, a stirring tank provided on the anti-slip pad, the side wall of the stirring tank being a hollow structure, a circulating water pipeline provided inside the hollow structure of the side wall of the stirring tank, an inlet fixedly connected to the upper part of the circulating water pipeline, an outlet fixedly connected to the lower part of the circulating water pipeline, a hot water pump and a cold water pump connected to the inlet, a hot water pump connected to a hot water tank, a cold water pump connected to a cold water tank, and a return water tank connected to the outlet;

[0006] The upper part of the shell is fixedly connected to a first motor and a second motor. The second motor is fixedly connected to a scraper shaft. The bottom of the scraper shaft is fixedly connected to a scraper ring. The scraper ring matches the internal size of the mixing tank. The upper part of the scraper ring is fixedly connected to a scraper. There are two sets of scrapers. The scrapers are arc-shaped.

[0007] The first motor is provided in two sets. The output end of the first motor is fixedly connected to a stirring shaft, and the lower part of the stirring shaft is fixedly connected to a stirring paddle. The stirring paddle is provided in two sets.

[0008] A fixing rod is fixedly connected to the lower part of the housing, and several stops are fixedly connected to the fixing rod. A temperature sensor is fixedly connected to the lower part of the housing.

[0009] A sealing barrel is fixedly connected to the lower part of the housing. A partition is fixedly connected inside the sealing barrel. A protective cover is fixedly connected below the partition. Two sets of protective covers are provided. The bottom of the protective cover has a sliding groove and a mounting groove, with two sets of each. A third motor is fixedly connected inside the mounting groove. A screw rod is fixedly connected to the output end of the third motor. A slider is threaded onto the screw rod. A cover plate is fixedly connected to the slider. A limiting groove is provided on the side wall of the protective cover. The width of the limiting groove matches the thickness of the cover plate. A camera is fixedly connected to the bottom of the protective cover. Two sets of cameras are provided, and the cameras are located inside the two sets of protective covers respectively.

[0010] The present invention further illustrates that a slide rail is fixedly connected to the left side of the housing, and two sets of slide rails are provided. A through groove is opened on the left side of the housing, and the bottom plate is disposed in the through groove. The left side of the bottom plate matches the shape of the slide rail. A reinforcing rib is fixedly connected to the lower part of the bottom plate, and two sets of reinforcing ribs are provided. A baffle is fixedly connected to the upper part of the bottom plate.

[0011] The present invention further illustrates that the bottom of the mixing tank is provided with a discharge port, and a first sealing cap is provided at the lower part of the discharge port.

[0012] The present invention further illustrates that the bottom of the mixing tank is fixedly connected to a pulley, and four sets of pulleys are provided.

[0013] The present invention further illustrates that a first connecting block is fixedly connected to the upper left side of the base plate, a chain is fixedly connected to the upper part of the first connecting block, the left side part of the chain is disposed inside the through groove, a second connecting block is fixedly connected to the other end of the chain, a hydraulic rod is fixedly connected to the other end of the second connecting block, a gear is connected to the chain, a gear shaft is fixedly connected in the middle of the gear, and both ends of the gear shaft are connected to the housing bearing.

[0014] The present invention further illustrates that a feeding port is fixedly connected to the side wall of the sealed barrel, and a second sealing cap is provided on the upper part of the feeding port;

[0015] The bottom of the sealed container has a sealing groove, the shape of which matches the shape of the mixing container.

[0016] The present invention further illustrates that an alarm light is fixedly connected to the top of the housing, which illuminates when the device malfunctions. An operating box is fixedly connected to the outer wall of the housing, and the operating box is fixedly connected to a temperature display, a display screen, a power switch, and an emergency stop button. The temperature display is electrically connected to a temperature sensor.

[0017] The present invention further illustrates that the stirring device also includes an analysis system, which includes a signal collection module and a control module. The signal collection module includes a signal collection submodule, a data calculation submodule, a data analysis submodule, and a temperature collection submodule. The signal collection submodule and the data analysis submodule are electrically connected to a camera, and the temperature collection submodule is electrically connected to a temperature sensor. The control module includes a control submodule, a time submodule, and an alarm submodule. The control submodule is electrically connected to a first motor, a second motor, a third motor, a hot water pump, and a cold water pump.

[0018] The present invention further explains that the method of using the stirring device is as follows:

[0019] Step 1: Connect the equipment to the power supply, press the power switch, and check that all equipment parameters are operating normally;

[0020] Step 2: Push the mixing bowl above the base plate so that the position of the mixing bowl corresponds to the position of the sealing bowl;

[0021] Step 3: Set the mixing program and raise the mixing bowl to the mixing position;

[0022] Step 4: Add the ingredients into the mixing tank through the feeding port, and perform mixing, scraping and monitoring. After each mixing step is completed, proceed to the next step of adding, mixing, scraping and monitoring, and repeat this step until all mixing steps are completed.

[0023] Step 5: After mixing is complete, the mixing tank is lowered to the ground, and the staff pushes the mixing tank to the next production stage, where the mixed positive electrode slurry is discharged through the discharge port.

[0024] The present invention further explains that step four specifically includes the following operational steps:

[0025] Step 4-a: The staff adds the ingredients into the mixing tank through the feeding port. The control submodule controls the first motor to start, which drives the mixing shaft to rotate, thereby driving the mixing paddle to mix the positive electrode slurry. At this time, the mixing is at low speed, and the time submodule starts timing.

[0026] Step 4-b: After the set time is reached, the data is transmitted to the control submodule. The control submodule controls the second motor to start, which drives the scraper shaft to rotate, which in turn drives the scraper ring to rotate, thereby driving the arc-shaped scraper to rotate. At this time, the scraping is done at low speed.

[0027] Step 4-c: After scraping off the material adhering to the wall of the mixing tank during feeding and the slurry adhering to the inner wall of the mixing tank during mixing, the control submodule switches the mixing speed from low speed to high speed to make the slurry mix quickly and evenly, and the time submodule starts timing.

[0028] Step 4-d: After the set time is reached, the control submodule controls the first motor to stop and controls the second motor to continue scraping the material at a low speed for a short time, scraping the material off the inner wall of the mixing tank during the mixing process;

[0029] Step 4-f: After each mixing stage, the control submodule starts the third motor, which rotates the auger and moves the slider within the chute, thereby moving the cover plate and opening the protective cover. This position is the monitoring position. The camera transmits the captured image to the signal collection submodule, which then transmits the signal from the mixing tank wall to the data calculation submodule. The data calculation submodule calculates the percentage of the area S of the adhering material on the mixing tank wall above the slurry surface. 比 The data analysis submodule analyzes and calculates the results and feeds them back to the control module. At the same time, the temperature collection submodule collects the slurry temperature T transmitted by the temperature sensor and feeds it back to the control subsystem.

[0030] Step 4-g: During the slurry mixing process, the circulating water pipeline is connected to a cold water pump to cool the slurry. Therefore, the slurry temperature T is divided into suitable and high temperature. T≤a is suitable, T>a is high temperature, and a is the highest suitable temperature.

[0031] Step 4-h: To ensure full-range monitoring, both left and right cameras work simultaneously at this time. The data calculation submodule will calculate the percentage of the area of ​​the adhering material on the mixing tank wall, S. 比 Divided into S 比1 and S 比2 Because the two cameras are working simultaneously, their shooting areas will overlap, therefore S 比 For S 比1 S 比2 The sum of the two;

[0032] S% of the area of ​​the adhering material on the wall of the mixing tank 比 The calculation formula is:

[0033]

[0034]

[0035] S 比 =S比1 +S 比2

[0036] In the formula, S is the area of ​​the mixing tank wall above the slurry surface. 比1 The calculation submodule calculates the percentage of the area of ​​the adhering material on the wall of the mixing tank above the slurry surface in the image captured by the left camera, S 比2 The calculation submodule calculates the percentage of the area of ​​the adhering material on the mixing tank wall above the slurry surface in the image captured by the right camera. S1' is the area of ​​the adhering material above the slurry surface captured by the left camera, and S2' is the area of ​​the adhering material above the slurry surface captured by the right camera, as identified by the data analysis submodule. Since S... 比 It is proportional to the area S' of the adherend, and S 比 Divided into lower and higher levels, 0≤S 比 <3% is considered low, 3% ≤ S 比 ≤100% is considered advanced.

[0037] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention, by setting up a camera, scraper, temperature sensor and analysis system, can directly monitor the stirring condition inside the mixing tank at each stirring stage, ensuring the uniformity of slurry mixing, while avoiding the need to frequently open the stirring device to observe the stirring condition and scrape the tank wall, as well as the need to reinstall the stirring device after observation, thereby improving the stirring efficiency. Attached Figure Description

[0038] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a first cross-sectional schematic diagram of the present invention;

[0041] Figure 3 This is a partially enlarged schematic diagram of region A of the present invention;

[0042] Figure 4 This is a partially enlarged schematic diagram of region B of the present invention;

[0043] Figure 5 This is a partially enlarged schematic diagram of region C of the present invention;

[0044] Figure 6 This is a second cross-sectional schematic diagram of the present invention;

[0045] Figure 7 This is a partial cross-sectional schematic diagram of the monitoring component of the present invention;

[0046] Figure 8 This is a cross-sectional schematic diagram of the monitoring component of the present invention;

[0047] Figure 9 This is a schematic diagram of the circulating water pipeline of the present invention;

[0048] Figure 10 This is a schematic diagram of the analysis system of the present invention;

[0049] In the diagram: 1. Shell; 2. Slide rail; 3. Through groove; 4. Base plate; 5. Reinforcing rib; 6. Baffle; 7. Mixing tank; 8. Circulating water pipeline; 9. Inlet; 10. Outlet; 11. Discharge port; 12. First sealing cover; 13. Anti-slip pad; 14. First connecting block; 15. Chain; 16. Gear; 17. Gear shaft; 18. Second connecting block; 19. Hydraulic rod; 20. Sealing tank; 21. Feed port; 22. Second sealing cover; 23. Vacuum gauge; 24. Air extraction pipeline; 25. Pipeline switch; 26. Vacuum pump; 27. Sealing groove; 28. First motor; 29. ​​Mixing shaft; 30. Stirring... 31. Mixing paddle; 32. Scraper shaft; 33. Scraper ring; 34. Scraper blade; 35. Fixing rod; 36. Stop block; 37. Temperature sensor; 38. Control box; 39. Temperature display; 40. Display screen; 41. Power switch; 42. Emergency stop button; 43. Alarm light; 44. Pulley; 45. Partition plate; 46. Protective cover; 47. Slide groove; 48. Mounting groove; 49. Third motor; 50. Helical rod; 51. Sliding block; 52. Camera; 53. Cover plate; 54. Second motor; 55. Limiting groove; 56. Cold water pump; 57. Hot water tank; 58. Cold water tank; 59. Return water tank. Detailed Implementation

[0050] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, the present invention provides a technical solution: a stirring device for mixing positive electrode materials of lithium battery and its usage method, including a shell 1 and a base plate 4. A slide rail 2 is fixedly connected to the left side of the shell 1, and two sets of slide rails 2 are provided. A through groove 3 is opened on the left side of the shell 1, and the base plate 4 is disposed in the through groove 3. The left side of the base plate 4 matches the shape of the slide rail 2. A reinforcing rib 5 is fixedly connected to the lower part of the base plate 4, and two sets of reinforcing ribs 5 are provided to enhance the stability of the base plate 4. A baffle 6 is fixedly connected to the upper part of the base plate 4 to prevent objects on the base plate 4 from colliding with the slide rail 2.

[0052] like Figure 1 , Figure 2 , Figure 3 and Figure 9 As shown, an anti-slip mat 13 is provided on the upper part of the base plate 4, and a mixing tank 7 is provided on the anti-slip mat 13. The anti-slip mat 13 is used to prevent the mixing tank 7 from sliding on the base plate 4. The side wall of the mixing tank 7 is a hollow structure, and a circulating water pipe 8 is provided inside the hollow structure of the side wall of the mixing tank 7. The upper part of the circulating water pipe 8 is fixedly connected to a water inlet 9, and the lower part of the circulating water pipe 8 is fixedly connected to a water outlet 10. The water inlet 9 is connected to a hot water pump 58 and a cold water pump 55. The hot water pump 58 is connected to a hot water tank 56, and the cold water pump 55 is connected to a cold water tank 57. The water outlet 10 is connected to a return water tank 59, which plays a role in heating and cooling the mixing tank 7.

[0053] The mixing tank 7 has a discharge port 11 at the bottom, and a first sealing cover 12 is provided at the bottom of the discharge port 11. The discharge port 11 is used for discharging material, and the first sealing cover 12 is used to seal the discharge port 11 during mixing.

[0054] The bottom of the mixing tank 7 is fixedly connected to pulleys 43, and four sets of pulleys 43 are provided to make the mixing tank 7 easy to move.

[0055] A first connecting block 14 is fixedly connected to the upper left side of the base plate 4. A chain 15 is fixedly connected to the upper part of the first connecting block 14. The left side of the chain 15 is located inside the through groove 3. A second connecting block 18 is fixedly connected to the other end of the chain 15. A hydraulic rod 19 is fixedly connected to the other end of the second connecting block 18. A gear 16 is connected to the chain 15. A gear shaft 17 is fixedly connected to the middle of the gear 16. Both ends of the gear shaft 17 are connected to the bearings of the housing 1. When the hydraulic rod 19 retracts, it pulls the right end of the chain 15 downward. Since the chain 15 is bonded to the gear 16 and the gear shaft 17 is connected to the bearings of the housing 1, it drives the right end of the chain 15 upward, which in turn drives the base plate 4 upward, thereby driving the mixing tank 7 upward.

[0056] like Figure 4 As shown, a sealing barrel 20 is fixedly connected to the lower part of the shell 1, and a feeding port 21 is fixedly connected to the side wall of the sealing barrel 20. A second sealing cover 22 is provided on the upper part of the feeding port 21. The feeding port 21 is used for feeding, and the second sealing cover 22 is used for sealing during stirring.

[0057] A vacuum gauge 23 is fixedly connected to the side wall of the sealed container 20. A vacuum pipe 24 is provided at the lower part of the vacuum gauge 23. The vacuum pipe 24 has four connecting branches. One branch of the vacuum pipe 24 is fixedly connected to the vacuum gauge 23, so that the vacuum gauge 23 can display the vacuum degree inside the sealed container 20 during vacuum stirring. One branch of the vacuum pipe 24 is located on the right side of the vacuum gauge 23 and is fixedly connected to a vacuum pump 26. One branch of the vacuum pipe 24 is located on the left side of the vacuum gauge 23 but is not connected to any component. One branch of the vacuum pipe 24 is fixedly connected to the sealed container 20. A pipe switch 25 is provided on the vacuum pipe 24. There are two sets of pipe switches 25. One set of pipe switches 25 is located on the right side of the vacuum pipe 24. When vacuuming is required inside the sealed container 20, the pipe switch 25 is opened to vacuum the inside of the sealed container 20. The other set of pipe switches 25 is located on the left side of the vacuum pipe 24. When stirring is completed, the pipe switch 25 is opened to break the vacuum condition inside the sealed container 20.

[0058] like Figure 5 As shown, a sealing groove 27 is provided at the bottom of the sealing barrel 20. The shape of the sealing groove 27 matches the shape of the mixing barrel 7, and is used to form a seal when vacuum mixing is required.

[0059] like Figure 2 , Figure 4 and Figure 5 As shown, a first motor 28 and a second motor 53 are fixedly connected inside the upper part of the housing 1. The first motor 28 is provided in two sets. The output end of the first motor 28 is fixedly connected to a stirring shaft 29. The lower part of the stirring shaft 29 is fixedly connected to a stirring paddle 30. The stirring paddle 30 is provided in two sets and is used for stirring. The second motor 53 is fixedly connected to a scraper shaft 31. The bottom of the scraper shaft 31 is fixedly connected to a scraper ring 32. The scraper ring 32 matches the internal size of the mixing tank 7. The upper part of the scraper ring 32 is fixedly connected to a scraper 33. The scraper 33 is provided in two sets and is arc-shaped. It is used to scrape the material off the inner wall of the mixing tank 7 during stirring.

[0060] like Figure 1 and Figure 6 As shown, a fixing rod 34 is fixedly connected to the lower part of the shell 1, and several blocks 35 are fixedly connected to the fixing rod 34 for better stirring. A temperature sensor 36 is fixedly connected to the lower part of the shell 1. The temperature sensor 36 is used to measure the temperature of the slurry inside the stirring tank 7 after each stirring.

[0061] An alarm light 42 is fixedly connected to the top of the housing 1. The alarm light 42 illuminates when the equipment malfunctions. An operation box 37 is fixedly connected to the outer wall of the housing 1. The operation box 37 is fixedly connected to a temperature display 38, a display screen 39, a power switch 40, and an emergency stop button 41. The temperature display 38 is electrically connected to the temperature sensor 36 and is used to display the temperature of the slurry inside the mixing tank 7. The display screen 39 is used to display and set the mixing program. The power switch 40 is used to turn the mixing device on or off. The emergency stop button 41 is pressed when the alarm light 42 is on to perform an emergency stop.

[0062] like Figure 6 , Figure 7 and Figure 8 As shown, a partition 44 is fixedly connected inside the sealed barrel 20. A protective cover 45 is fixedly connected below the partition 44. Two sets of protective covers 45 are provided, one set located on the left side of the partition 44 and the other set located on the right side of the partition 44. The bottom of the protective cover 45 is provided with a sliding groove 46 and a mounting groove 47, with two sets of each. A third motor 48 is fixedly connected inside the mounting groove 47. A screw rod 49 is fixedly connected to the output end of the third motor 48. A slider 50 is threaded onto the screw rod 49. The slider 50 is fixedly connected to... The protective cover 45 has a cover plate 52 and a limiting groove 54 on its side wall. The width of the limiting groove 54 matches the thickness of the cover plate 52. A camera 51 is fixedly connected to the bottom of the protective cover 45. Two sets of cameras 51 are set up and are located in the two sets of protective covers 45 respectively to ensure full-range monitoring. The third motor 48 is started, which drives the screw rod 49 to rotate, drives the slider 50 to slide in the slide groove 46, and drives the cover plate 52 to move, thereby closing the protective cover 45 and preventing the slurry inside the mixing tank 7 from adhering to the camera 51 during the mixing process.

[0063] like Figure 10 As shown, this stirring device also includes an analysis system, which includes a signal collection module and a control module. The signal collection module includes a signal collection submodule, a data calculation submodule, a data analysis submodule, and a temperature collection submodule. The signal collection submodule and the data analysis submodule are electrically connected to the cameras 51. The signal collection submodule is used to collect signals transmitted by the two cameras 51. The data calculation submodule is used to calculate the signals collected by the signal collection submodule. The data analysis submodule analyzes the calculation results and feeds them back to the control module. The temperature collection submodule is electrically connected to the temperature sensor 36 and is used to collect the slurry temperature. The control module includes a control submodule, a time submodule, and an alarm submodule. The control submodule is electrically connected to the first motor 28, the second motor 53, the third motor 48, the hot water pump 58, and the cold water pump 55. The time submodule is used for timing, and the alarm submodule is used for alarm prompts.

[0064] Working principle: The method of using this stirring device is as follows:

[0065] Step 1: Connect the equipment to the power supply, press the power switch 40, and check that all parameters of the equipment are operating normally;

[0066] Step 2: Push the mixing tank 7 above the base plate 4 so that the position of the mixing tank 7 corresponds to the position of the sealing tank 20;

[0067] Step 3: Set the mixing program and raise mixing bowl 7 to the mixing position;

[0068] Specifically, click on the display screen 39 to set the stirring program. The control submodule controls the hydraulic rod 19 to retract, which drives the right end of the chain 15 to descend and the left end to rise, driving the base plate 4 to rise, thereby driving the stirring tank 7 to rise. When the stirring tank 7 rises to the top and forms a seal with the sealing groove 27 in the sealing tank 20, the control submodule controls the hydraulic rod 19 to stop retracting. This position is the stirring position.

[0069] Step 4: Add the ingredients into the mixing tank 7 through the feeding port 21, and perform mixing, scraping and monitoring. After each mixing step is completed, perform the next step of adding, mixing, scraping and monitoring, and repeat this step until all mixing steps are completed.

[0070] Specifically, the staff adds the ingredients into the mixing tank 7 through the feeding port 21. The control submodule controls the first motor 28 to start, which drives the mixing shaft 29 to rotate, thereby driving the mixing paddle 30 to stir the positive electrode slurry. At this time, the stirring is at a low speed. The time submodule keeps a timer. After the set time is reached, the timer transmits the time to the control submodule. The control submodule controls the second motor 53 to start, which drives the scraper shaft 31 to rotate, which drives the scraper ring 32 to rotate, thereby driving the arc-shaped scraper 33 to rotate. At this time, the scraping is at a low speed. After scraping off the material that adhered to the wall of the mixing tank 7 during the feeding process and the slurry that adhered to the inner wall of the mixing tank 7 during the stirring process, the control submodule controls the stirring to switch from low speed stirring to high speed stirring, so that the slurry is quickly mixed. The time submodule keeps a timer. After the set time is reached, the control submodule controls the first motor 28 to stop and controls the second motor 53 to continue to scrape off the material on the inner wall of the mixing tank 7 during the stirring process for subsequent monitoring.

[0071] After each mixing cycle, the control submodule starts the third motor 48, which rotates the screw rod 49, causing the slider 50 to move within the chute 46. This, in turn, moves the cover plate 52, opening the protective cover 45. This position is the monitoring position, where the camera 51 transmits the captured image to the signal collection submodule. The signal collection submodule then transmits the signal from the mixing tank 7 wall to the data calculation submodule. The data calculation submodule calculates the percentage S of the area of ​​the adhering material on the mixing tank 7 wall above the slurry surface. 比 The data analysis submodule analyzes and calculates the results and feeds them back to the control module. At the same time, the temperature collection submodule collects the slurry temperature T transmitted by the temperature sensor 36 and feeds it back to the control subsystem.

[0072] During the slurry mixing process, the circulating water pipeline 8 is connected to the cold water pump 55 by default to cool the slurry. Therefore, the slurry temperature T is divided into suitable and high temperature. T≤a is suitable, T>a is high temperature, and a is the highest suitable temperature.

[0073] To ensure comprehensive monitoring, both left and right cameras 51 operate simultaneously. The data calculation submodule calculates the percentage of the area of ​​the adhering material on the walls of the mixing tank 7 as S. 比 Divided into S 比1 and S 比2 Because the two cameras 51 are working simultaneously, their shooting areas will overlap, therefore S 比 For S 比1 S 比2 The sum of the two;

[0074] The percentage of surface area of ​​the adhering material on the walls of the mixing tank (S) 比 The calculation formula is:

[0075]

[0076]

[0077] S 比 =S 比1 +S 比2

[0078] In the formula, S is the area of ​​the mixing tank wall above the slurry surface. 比1 The calculation submodule calculates the percentage of the area of ​​the adhering material on the wall of the mixing tank 7 above the slurry surface in the image captured by the left camera 51. 比2 The calculation submodule calculates the percentage of the area of ​​the adhering material on the wall of the mixing tank 7 above the slurry surface in the image captured by the right camera 51. S1' is the area of ​​the adhering material above the slurry surface captured by the left camera 51, and S2' is the area of ​​the adhering material above the slurry surface captured by the right camera 51, identified by the data analysis submodule. Since S... 比 It is proportional to the area S' of the adherend, and S 比 Divided into lower and higher levels, 0≤S 比 <3% is considered low, 3% ≤ S 比 ≤100% is considered advanced;

[0079] Step 5: After mixing is complete, the mixing tank 7 is lowered to the ground, and the staff pushes the mixing tank 7 to the next production stage, and the mixed positive electrode slurry is released through the discharge port 11;

[0080] Specifically, after mixing is completed, the control submodule controls the hydraulic rod 19 to extend, causing the right end of the chain 15 to rise and the left end to fall, which in turn causes the base plate 4 to fall, thereby causing the mixing tank 7 to fall. When all the pulleys 43 at the bottom of the mixing tank 7 are in contact with the ground, the control submodule controls the hydraulic rod 19 to stop extending, and the workers push the mixing tank 7 to the next production stage, releasing the mixed positive electrode slurry through the discharge port 11.

[0081] Specifically, step four includes the following steps:

[0082] Step 4-(a): When T≤a, it indicates that the slurry temperature T is suitable;

[0083] Specifically, when 0≤S 比 When <3%, the area of ​​the adhering material on the wall of the mixing tank is S. 比 For lower grades, this mixing device continues to add and mix subsequent materials;

[0084] When 3% ≤ S 比 When the content is ≤100%, the area of ​​the adhering material on the wall of the mixing tank is S. 比 If the temperature is too low, it indicates that the slurry or added ingredients may adhere to the tank wall. In this case, the control submodule starts the hot water pump 58 and connects to the circulating water pipe 8, replacing the water in the circulating water pipe 8 with hot water. After heating the slurry in the mixing tank 7 to a temperature, the control submodule starts the first motor 28 to begin rapid stirring. The rapid stirring is done by gradually increasing the speed and then decreasing it again, combined with periodic forward and reverse rotation to increase the stirring amplitude. At the same time, the control submodule starts the second motor 53 to begin rapid scraping. The rapid scraping is done periodically, with the speed gradually increasing and then decreasing to avoid excessive scraping speed, which could cause the tank wall to heat up and thus cause the slurry to heat up rapidly. The direction of scraping is consistent with the direction of rapid stirring. After a period of time, the control submodule stops the first motor 28 and controls the second motor 53 to reduce its speed to low-speed scraping. After the process ends, the monitoring is repeated, up to twice. If the area of ​​the adhered material is S... 比 A temperature drop to low indicates that the slurry temperature is too low or that the slurry or added ingredients are adhering to the tank wall. The mixing device will continue to add and mix subsequent materials. If the area of ​​the adhered material accounts for S... 比 If the temperature is not lowered to the lowest level, it indicates that the temperature does not affect the slurry or the added ingredients are adhering to the barrel wall. At this time, the alarm submodule will issue an alarm prompt, alarm light 42 will light up, and staff will need to intervene.

[0085] Step 4-(II): When T>a, it means that the slurry temperature T is high. The slurry in the mixing tank 7 needs to be cooled down before secondary mixing. At this time, the circulating water pipeline 8 continues to be connected to the cold water pump 55. At the same time, the alarm submodule will issue an alarm prompt and the alarm light 42 will light up. The staff will check whether the water temperature in the cold water tank 57 is too high and whether the cold water pump 55 is turned on. After confirmation, wait for the slurry temperature T to drop to a suitable temperature.

[0086] Specifically, when 0≤N 比 When <3%, the area of ​​the adhering material on the wall of the mixing tank is S. 比 At a lower temperature, once the slurry temperature T drops to a suitable temperature, the mixing device continues to add and mix subsequent materials.

[0087] When 3%≤N 比 When the content is ≤100%, the area of ​​the adhering material on the wall of the mixing tank is S. 比 The highest setting indicates that the temperature is independent of the slurry adhering to the tank wall or any added ingredients. The control submodule starts the second motor 53 to begin rapid scraping. This rapid scraping is periodic, with the speed gradually increasing and then decreasing to avoid excessive scraping speed that could cause the tank wall to heat up, thus raising the temperature of the slurry. After several minutes of scraping, the control submodule starts the first motor 28 to begin rapid stirring. This rapid stirring is a periodic combination of forward and reverse rotation, with the direction of rapid scraping always matching that of rapid stirring. This increases the stirring amplitude and facilitates better scraping off and quickly mixing the material adhering to the tank wall of the mixing tank 7. After a certain period, the control submodule stops the first motor 28, and the second motor 53 continues to scrape at a low speed for a short time. After this, the monitoring is repeated, up to twice. If the area of ​​the adhering material accounts for S... 比 If the concentration is reduced to a lower level, continue adding and mixing the remaining materials. If the area of ​​the adhered material accounts for S... 比 If the alarm level is not lowered to the lowest level, the alarm submodule will issue an alarm prompt, alarm light 42 will illuminate, and staff will need to intervene.

[0088] Through the above steps, the mixing situation inside the mixing tank 7 can be directly monitored at each mixing stage, ensuring the uniformity of the slurry mixing. At the same time, it avoids the need to frequently open the mixing device to observe the mixing situation and scrape the tank wall, as well as the need to reinstall the mixing device after observation, thereby improving the mixing efficiency.

[0089] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stirring device for mixing lithium battery cathode materials, comprising a shell (1) and a base plate (4), characterized in that: An anti-slip mat (13) is provided on the upper part of the base plate (4), and a stirring tank (7) is provided on the anti-slip mat (13). The side wall of the stirring tank (7) is hollow, and a circulating water pipe (8) is provided inside the hollow side wall of the stirring tank (7). An inlet (9) is fixedly connected to the upper part of the circulating water pipe (8), and an outlet (10) is fixedly connected to the lower part of the circulating water pipe (8). A hot water pump (58) and a cold water pump (55) are connected to the inlet (9). The hot water pump (58) is connected to a hot water tank (56), and the cold water pump (55) is connected to a cold water tank (57). The outlet (10) is connected to a return water tank (59). The upper part of the housing (1) is fixedly connected to a first motor (28) and a second motor (53). The second motor (53) is fixedly connected to a scraper shaft (31). The bottom of the scraper shaft (31) is fixedly connected to a scraper ring (32). The scraper ring (32) matches the internal size of the mixing tank (7). The upper part of the scraper ring (32) is fixedly connected to a scraper (33). There are two sets of scrapers (33). The scrapers (33) are arc-shaped. The first motor (28) is provided in two sets. The output end of the first motor (28) is fixedly connected to a stirring shaft (29). The lower part of the stirring shaft (29) is fixedly connected to a stirring paddle (30). The stirring paddle (30) is provided in two sets. A fixing rod (34) is fixedly connected to the lower part of the housing (1), and a number of stops (35) are fixedly connected to the fixing rod (34). A temperature sensor (36) is fixedly connected to the lower part of the housing (1). A sealing barrel (20) is fixedly connected to the lower part of the housing (1). A partition (44) is fixedly connected inside the sealing barrel (20). A protective cover (45) is fixedly connected below the partition (44). Two sets of protective covers (45) are provided. A sliding groove (46) and a mounting groove (47) are provided at the bottom of the protective cover (45). Two sets of sliding grooves (46) and mounting grooves (47) are provided. A third motor (48) is fixedly connected inside the mounting groove (47). A screw rod (49) is fixedly connected to the output end. A slider (50) is threaded onto the screw rod (49). A cover plate (52) is fixedly connected to the slider (50). A limiting groove (54) is opened on the side wall of the protective cover (45). The width of the limiting groove (54) matches the thickness of the cover plate (52). A camera (51) is fixedly connected to the bottom of the protective cover (45). Two sets of cameras (51) are provided. The cameras (51) are located in the two sets of protective covers (45) respectively.

2. The stirring device for preparing lithium battery cathode materials according to claim 1, characterized in that: The left side of the housing (1) is fixedly connected to a slide rail (2), and two sets of slide rails (2) are provided. A through groove (3) is opened on the left side of the housing (1), and the bottom plate (4) is set in the through groove (3). The left side of the bottom plate (4) matches the shape of the slide rail (2). A reinforcing rib (5) is fixedly connected to the lower part of the bottom plate (4), and two sets of reinforcing ribs (5) are provided. A baffle (6) is fixedly connected to the upper part of the bottom plate (4).

3. The stirring device for preparing lithium battery cathode materials according to claim 2, characterized in that: The mixing tank (7) has a discharge port (11) at the bottom, and a first sealing cap (12) is provided at the lower part of the discharge port (11).

4. The stirring device for preparing lithium battery cathode materials according to claim 3, characterized in that: The bottom of the mixing tank (7) is fixedly connected to a pulley (43), and four sets of pulleys (43) are provided.

5. The stirring device for preparing lithium battery cathode materials according to claim 4, characterized in that: A first connecting block (14) is fixedly connected to the upper left side of the base plate (4). A chain (15) is fixedly connected to the upper part of the first connecting block (14). The left side of the chain (15) is located inside the through groove (3). A second connecting block (18) is fixedly connected to the other end of the chain (15). A hydraulic rod (19) is fixedly connected to the other end of the second connecting block (18). A gear (16) is connected to the chain (15). A gear shaft (17) is fixedly connected to the middle of the gear (16). Both ends of the gear shaft (17) are connected to the bearings of the housing (1).

6. The stirring device for preparing lithium battery cathode materials according to claim 5, characterized in that: The sealing barrel (20) has a feeding port (21) fixedly connected to its side wall, and a second sealing cover (22) is provided on the upper part of the feeding port (21); The bottom of the sealing barrel (20) is provided with a sealing groove (27), the shape of which matches the shape of the mixing barrel (7).

7. The stirring device for preparing lithium battery cathode materials according to claim 6, characterized in that: An alarm light (42) is fixedly connected to the top of the housing (1). The alarm light (42) illuminates when the device is malfunctioning. An operation box (37) is fixedly connected to the outer wall of the housing (1). The operation box (37) is fixedly connected to a temperature display (38), a display screen (39), a power switch (40), and an emergency stop button (41). The temperature display (38) is electrically connected to a temperature sensor (36).

8. A method of using a stirring device for mixing lithium battery cathode materials, characterized in that: The stirring device further includes an analysis system, which includes a signal collection module and a control module. The signal collection module includes a signal collection submodule, a data calculation submodule, a data analysis submodule and a temperature collection submodule. The signal collection submodule and the data analysis submodule are electrically connected to a camera (51). The temperature collection submodule is electrically connected to a temperature sensor (36). The control module includes a control submodule, a time submodule and an alarm submodule. The control submodule is electrically connected to a first motor (28), a second motor (53), a third motor (48), a hot water pump (58) and a cold water pump (55).

9. The method of using the stirring device for lithium battery cathode material preparation according to claim 8, characterized in that: The method of using this stirring device is as follows: Step 1: Connect the equipment power supply, press the power switch (40), and check that all parameters of the equipment are operating normally; Step 2: Push the mixing tank (7) above the bottom plate (4) so ​​that the position of the mixing tank (7) corresponds to the position of the sealing tank (20); Step 3: Set the stirring program and raise the stirring tank (7) to the stirring position; Step 4: Add the ingredients into the mixing tank (7) through the feeding port (21), and perform mixing, scraping and monitoring. After each mixing step is completed, perform the next step of adding, mixing, scraping and monitoring. Repeat this step until all mixing steps are completed. Step 5: After mixing is completed, the mixing tank (7) is lowered to the ground, and the staff pushes the mixing tank (7) to the next production stage and releases the mixed positive electrode slurry through the discharge port (11).

10. The method of using the stirring device for lithium battery cathode material preparation according to claim 8, characterized in that: Step four specifically includes the following steps: Step 4-a: The staff adds the ingredients into the mixing tank (7) through the feeding port (21). The control submodule controls the first motor (28) to start, which drives the mixing shaft (29) to rotate, thereby driving the mixing paddle (30) to mix the positive electrode slurry. At this time, the mixing is at low speed, and the time submodule starts timing. Step 4-b: After the set time is reached, the data is transmitted to the control submodule. The control submodule controls the second motor (53) to start, which drives the scraper shaft (32) to rotate, which in turn drives the scraper ring (32) to rotate, thereby driving the arc-shaped scraper (33) to rotate. At this time, the scraper is scraped at low speed. Step 4-c: When the material adhering to the wall of the mixing tank (7) during feeding and the slurry adhering to the inner wall of the mixing tank (7) during the mixing process are scraped off, the control submodule controls the mixing to switch from low-speed mixing to high-speed mixing, so that the slurry is quickly mixed evenly, and the time submodule starts timing. Step 4-d: After the set time is reached, the control submodule controls the first motor (28) to stop and controls the second motor (53) to continue to scrape the material at a low speed for a short time, scraping the material off the inner wall of the mixing tank (7) during the mixing process; Step 4-f: After each stirring stage, the control submodule starts the third motor (48), which drives the screw rod (49) to rotate, causing the slider (50) to move in the chute (46), thereby moving the cover plate (52) and opening the protective cover (45). This position is the monitoring position. The camera (51) transmits the captured image to the signal collection submodule. The signal collection submodule transmits the signal of the mixing tank (7) wall to the data calculation submodule. The data calculation submodule calculates the percentage of the area of ​​the adhering material on the mixing tank (7) wall above the slurry surface, S. 比 The data analysis submodule analyzes and calculates the results and feeds them back to the control module. At the same time, the temperature collection submodule collects the slurry temperature T transmitted by the temperature sensor (36) and feeds it back to the control subsystem. Step 4-g: During the slurry mixing process, the default circulating water pipeline (8) is connected to the cold water pump (55) to cool the slurry. Therefore, the slurry temperature T is divided into suitable and high temperature. T≤a is suitable, T>a is high temperature, and a is the highest suitable temperature. Step 4-h: To ensure full-range monitoring, both left and right cameras (51) work simultaneously at this time. The data calculation submodule will calculate the area ratio of the adhering material on the wall of the mixing tank (7) as S. 比 Divided into S 比1 and S 比2 Since the two cameras (51) are working simultaneously, their shooting areas will overlap. Therefore, S 比 For S 比1 S 比2 The sum of the two; The percentage of the area of ​​the adhering material on the wall of the mixing tank (7) is S 比 The calculation formula is: S 比 =S 比1 +S 比2 In the formula, S is the area of ​​the mixing tank (7) wall above the slurry surface, S 比1 The calculation submodule calculates the percentage of the area of ​​the adhering material on the wall of the mixing tank (7) above the slurry surface in the image captured by the left camera (51), S 比2 The calculation submodule calculates the percentage of the area of ​​the adhering material on the wall of the mixing tank (7) above the slurry surface in the image captured by the right camera (51). S1' is the area of ​​the adhering material above the slurry surface captured by the left camera (51) identified by the data analysis submodule, and S2' is the area of ​​the adhering material above the slurry surface captured by the right camera (51) identified by the data analysis submodule. Since S 比 It is proportional to the area S' of the adherend, and S 比 Divided into lower and higher levels, 0≤S 比 <3% is considered low, 3% ≤ S 比 ≤100% is considered advanced.

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