Negative electrode raw material regeneration system

Abstract

The embodiment of the utility model provides a negative electrode raw material regeneration system which comprises a solid-liquid composite balling machine, a powder feeding port and a liquid feeding port, negative electrode micro powder can enter the solid-liquid composite balling machine through the powder feeding port, a liquid binding agent can enter the solid-liquid composite balling machine through the liquid feeding port, and the liquid binding agent can enter the solid-liquid composite balling machine through the liquid feeding port. The solid-liquid composite pelletizing machine is used for mixing and pelletizing the negative electrode micro powder and the liquid binder to obtain a spherical material; the drying machine is connected with the solid-liquid composite pelletizing machine, the drying machine is a drum-type drying machine, and the drum-type drying machine is used for drying the spherical material and carrying out densification treatment on the spherical material through rolling; the high-temperature furnace is used for carrying out heat treatment on the dried spherical material to obtain a regenerated negative electrode raw material; the electronic control system is connected with the solid-liquid composite ball forming machine, the drying machine and the high-temperature furnace, and the electronic control system is used for controlling the solid-liquid composite ball forming machine, the drying machine and the high-temperature furnace to work.

Description

Technical Field

[0001] This utility model relates to the field of negative electrode material technology, and in particular to a negative electrode raw material regeneration system. Background Technology

[0002] Lithium-ion batteries have gained market acceptance as energy storage units in electric vehicles and emerging energy storage fields. To meet user application needs, the market is placing increasingly stringent demands on cost. Cost reduction and efficiency improvement efforts are being implemented across all stages of lithium-ion battery production. For anode materials, thanks to rapid development in recent years, the cost of each process has decreased significantly. Achieving overall cost leadership in anode materials is a crucial direction for continuous innovation and development in the anode field.

[0003] With the significant decrease in costs across various processes, the cost of anode materials is accounting for an increasingly larger proportion of total costs. The overall yield of anode materials is only 60-80%, meaning that the actual amount of qualified product obtained is only 60% to 80% of the theoretical maximum output. During the anode material preparation process, the raw material crushing and grading process inevitably generates a large amount of tailings (also known as anode micropowder, micropowder waste, etc.), currently accounting for 20-30% of the industry's total output. The disposal of these tailings has always been a difficult problem for the industry. They are either stored as solid waste for a long time, consuming resources, or used as fuel, but the selling price as fuel is less than 1000 yuan / ton, greatly reducing the utilization value of the tailings.

[0004] Therefore, there is an urgent need for a solution to handle the tailings of negative electrode materials and improve their utilization value. Utility Model Content

[0005] Therefore, in order to overcome at least some of the defects and deficiencies in the prior art, this utility model provides a negative electrode raw material regeneration system.

[0006] Specifically, this utility model embodiment provides a negative electrode raw material regeneration system, comprising: a solid-liquid composite pelletizing machine having a powder inlet and a liquid inlet, wherein negative electrode micro powder can enter the solid-liquid composite pelletizing machine through the powder inlet, and liquid binder can enter the solid-liquid composite pelletizing machine through the liquid inlet, the solid-liquid composite pelletizing machine being used to mix the negative electrode micro powder and the liquid binder to form spherical material; a dryer connected to the solid-liquid composite pelletizing machine, the dryer being a drum dryer, the drum dryer being used to dry the spherical material and densify the spherical material by rolling; a high-temperature furnace being used to heat-treat the dried spherical material to obtain regenerated negative electrode raw material; and an electrical control system connected to the solid-liquid composite pelletizing machine, the dryer, and the high-temperature furnace, the electrical control system being used to control the operation of the solid-liquid composite pelletizing machine, the dryer, and the high-temperature furnace.

[0007] In one specific embodiment of this utility model, the solid-liquid composite pelletizing machine includes: a pelletizing machine housing having a cylinder and a cover, wherein the powder inlet and the liquid inlet are located on the cover and communicate with the cylinder; a rotor assembly disposed within the cylinder; a pelletizing disc disposed within the cylinder and located at the bottom of the cylinder; and a transmission mechanism disposed on one side of the pelletizing machine housing, wherein the transmission mechanism is tractively connected to the rotor assembly and the pelletizing disc to drive the rotor assembly and the pelletizing disc.

[0008] In one specific embodiment of this utility model, the transmission mechanism includes: a rotor transmission assembly, including a first motor, a driving pulley, a driven pulley, and a transmission assembly; the first motor is driven to the driving pulley, the driven pulley is connected to the transmission assembly, the driving pulley and the driven pulley are driven to each other, and the transmission assembly is connected to the rotor assembly; and a granulation disc transmission assembly, including a second motor, a reducer, a driving gear, and a slewing bearing; the second motor is driven to the reducer, the reducer is connected to the driving gear, the driving gear is connected to the slewing bearing, and the slewing bearing is connected to the granulation disc.

[0009] In one specific embodiment of this utility model, the rotor assembly includes: a rotor shaft, rotor blades, a bottom scraper, and a side scraper. The rotor blades and the side scraper are spaced apart on the rotor shaft, and the bottom scraper is disposed on the rotor shaft close to the granulation disc. The rotor blades, the bottom scraper, and the side scraper extend along the diameter direction of the rotor shaft. The length of the rotor blades is less than the length of the side scraper, and the bottom scraper has a scraping portion that bends toward the granulation disc.

[0010] In one specific embodiment of this utility model, the gap between the side scraper and the cylinder is 3-5 mm, and the gap between the bottom scraper and the granulation disc is 3-5 mm.

[0011] In one specific embodiment of this utility model, the cylinder is further provided with a discharge gate and a proximity switch near the discharge gate, the discharge gate being movably connected to the cylinder; the solid-liquid composite pelletizing machine further includes: a discharge device, the discharge device including a hydraulic pump, a cylinder, a swing arm and a drive shaft, the drive shaft being connected to the discharge gate, the hydraulic pump being connected to the cylinder, the swing arm being connected between the cylinder and the drive shaft, the hydraulic pump being used to control the cylinder to drive the swing arm to reciprocate, so as to drive the discharge gate to open or close via the drive shaft, and the proximity switch being used to detect the opening and closing status of the discharge gate and provide feedback to the electronic control system.

[0012] In one specific embodiment of this utility model, the negative electrode raw material regeneration system further includes: a powder metering buffer bin equipped with a feeding speed control device, the powder metering buffer bin having a first discharge port connected to the solid-liquid composite pelletizing machine, the powder metering buffer bin being used to buffer and meter the negative electrode micro powder, the first discharge port also being equipped with a permanent magnet separator, the powder metering buffer bin being electrically connected to the electrical control system, and the feeding speed control device being used to control the feeding speed of the powder metering buffer bin to the solid-liquid composite pelletizing machine; and an additive metering tank connected to the solid-liquid composite pelletizing machine, the additive metering tank being used to buffer and meter the liquid binder, the additive metering tank being equipped with a liquid pump and an atomizing device, the liquid pump being used to control the flow rate of the liquid binder, and the atomizing device being used to atomize the liquid binder.

[0013] In one specific embodiment of this utility model, the negative electrode raw material regeneration system further includes a densification treatment device, which is used to densify the spherical material.

[0014] In one specific embodiment of this utility model, the solid-liquid composite pelletizing machine is further provided with a discharge temporary storage hopper connected to the discharge gate; the negative electrode raw material regeneration system further includes: a large-angle sidewall conveyor connected between the discharge temporary storage hopper and the dryer, used to convey the spherical material to the dryer; a finished product silo for storing the dried spherical material; an automatic packaging machine connected to the finished product silo for packaging the dried spherical material; and a bucket elevator located between the dryer and the finished product silo for conveying the dried spherical material to the finished product silo.

[0015] In one specific embodiment of this utility model, the high-temperature furnace includes: a furnace body, which includes a furnace shell, a furnace lining, and a furnace tank. The furnace lining is fixed to the furnace shell, and the furnace tank is rotatably connected to the furnace body. Guide plates are evenly arranged on the inner wall of the furnace tank, and the furnace tank has a feed port and a discharge port; a driving device connected to the furnace tank, which drives the furnace tank to rotate; a screw feeder with a second feed port, which is connected to the furnace tank and extends into the furnace tank along the feed port. The dried spherical material enters the furnace tank through the second feed port via the screw feeder; a discharge device connected to the discharge port; and a heating assembly connected to the furnace body for heating the furnace tank.

[0016] As can be seen from the above, the negative electrode raw material regeneration system provided by this utility model embodiment includes a solid-liquid composite pelletizing machine, a dryer, a high-temperature furnace, and an electrical control system. The electrical control system controls the operation of the solid-liquid composite pelletizing machine, the dryer, and the high-temperature furnace, so that the negative electrode micro powder and liquid binder are mixed and pelletized by the solid-liquid composite pelletizing machine to obtain spherical material. After drying by the dryer, it is heat-treated by the high-temperature furnace to obtain regenerated negative electrode raw material. The micro powder waste generated in the production process of negative electrode material can be processed to obtain regenerated negative electrode raw material. The regenerated negative electrode raw material can be recycled and reused as raw material for the preparation process of battery negative electrode material, solving the problem of low utilization value of tail material, improving the utilization value of tail powder, and improving the overall utilization rate of raw materials for battery negative electrode material. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a negative electrode raw material regeneration system provided in an embodiment of the present invention.

[0019] Figure 2 and Figure 3 This is a partial structural schematic diagram of the negative electrode raw material regeneration system provided in an embodiment of the present invention.

[0020] Figure 4A and Figure 4B for Figure 3 A schematic diagram of the structure of a solid-liquid composite pelletizing machine.

[0021] Figure 5 for Figure 4A A schematic diagram of a cross-sectional structure.

[0022] Figure 6 for Figure 4A A schematic diagram of the structure of the rotor assembly.

[0023] Figure 7 for Figure 4A Another cross-sectional structural diagram.

[0024] Figure 8 for Figure 7 A magnified view of a portion of region A.

[0025] Figure 9 and Figure 10 for Figure 1 A schematic diagram of the structure of a medium-high temperature furnace.

[0026] Figure 11 A flowchart illustrating the application method of the negative electrode raw material regeneration system provided in this embodiment of the utility model.

[0027] Figure 12 This is a schematic diagram of micro powder and spherical material.

[0028] Key component identification:

[0029] 10. Electrical control system; 20. Powder metering buffer bin; 30. Additive metering tank; 100. Solid-liquid composite pelletizing machine; 110. Granulator shell; 111. Cylinder; 1111. Liner; 112. Cover; 113. Discharge gate; 1121. Powder inlet; 1122. Liquid inlet; 120. Transmission mechanism; 121. Rotor transmission assembly; 1211. First motor; 1212. Drive pulley; 1213. Driven pulley; 1214. Transmission assembly; 122. Granulating disc transmission assembly; 1221. Second motor; 1222. Reducer; 1223. Drive gear; 1224. Slewing bearing; 130 131. Rotor assembly; 132. Rotor blades; 133. Bottom scraper; 1331. Scraping section; 134. Side scraper; 140. Granulation disc; 150. Discharge device; 160. Discharge storage hopper; 200. Dryer; 400. High-temperature furnace; 410. Furnace body; 411. Furnace shell; 412. Furnace lining; 413. Furnace tank; 4131. Guide plate; 420. Drive unit; 430. Screw feeder; 431. Second feed inlet; 440. Discharge device; 450. Heating component; 500. Large-angle sidewall conveyor; 600. Bucket elevator; 710. Finished product silo; 720. Automatic packaging machine. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments described in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, top, bottom) in this embodiment of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figures). If the specific posture changes, the directional indications will also change accordingly. In this embodiment of the present invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0032] See Figures 1 to 4B This utility model provides a negative electrode raw material regeneration system, which may include, for example, a solid-liquid composite pelletizing machine 100, a dryer 200, a high-temperature furnace 400, and an electrical control system 10.

[0033] The solid-liquid composite pelletizing machine 100, also known as a granulator, may have a material inlet, which may be divided into a powder inlet 1121 and a liquid inlet 1122. The negative electrode micro-powder enters the solid-liquid composite pelletizing machine 100 through the powder inlet 1121, and the liquid binder enters through the liquid inlet 1122. The negative electrode micro-powder is coke powder waste with an average particle size of approximately 2-5 micrometers generated during the raw material crushing process in the preparation of graphite negative electrode materials, or dust removal micro-powder waste with an average particle size of approximately 2-5 micrometers generated during other production processes, with raw coke powder being preferred. The liquid binder may be, for example, liquid asphalt, dextrin aqueous solution, asphalt solution, coal tar, etc. The solid-liquid composite pelletizing machine 100 is used to mix the negative electrode micro-powder and the liquid binder to form spherical materials.

[0034] The dryer 200 can be connected, for example, to a solid-liquid composite pelletizing machine 100. The spherical material obtained by mixing and pelletizing in the solid-liquid composite pelletizing machine 100 is conveyed to the dryer 200, where it is dried to obtain the dried spherical material. The dried spherical material is then conveyed to a high-temperature furnace 400 for heat treatment. The high-temperature furnace 400 heat-treats the dried spherical material, allowing the negative electrode powder and liquid binder in the spherical material to undergo a polymerization and fusion reaction, resulting in regenerated negative electrode raw material, thus achieving the regeneration of the negative electrode raw material. In one embodiment of this example, the dryer 200 is a drum dryer. The drum dryer is used to dry the spherical material and densify it through rolling. The spherical material rolls forward within the drum dryer, making it increasingly dense, thereby completing the densification process simultaneously with drying. In another embodiment of this example, the negative electrode raw material regeneration system may further include, for example, a densification device, which may be, for example, a static pressure device. The densification device is used to densify the spherical material. Specifically, it can be used to statically press the dried spherical material to make it more compact. The purpose of densification is to ensure sufficient contact and bonding between the negative electrode powders, which is beneficial for the mass transfer of the powders during heat treatment and for the liquid binder to fully react with the negative electrode powders.

[0035] The negative electrode raw material regeneration system provided in this embodiment includes a solid-liquid composite pelletizing machine 100, a dryer 200, a high-temperature furnace 400, and an electronic control system 10. Negative electrode micropowder and liquid binder are mixed and pelletized in the solid-liquid composite pelletizing machine 100 to obtain spherical material. After drying in the dryer 200, the material is heat-treated in the high-temperature furnace 400 to obtain regenerated negative electrode raw material. This system can process the micropowder waste generated during the production of negative electrode materials to obtain regenerated negative electrode raw material. This regenerated negative electrode raw material can be recycled and reused as raw material in the preparation of battery negative electrode materials, solving the problem of low powder utilization value and improving the overall utilization rate of raw materials for battery negative electrode materials. Furthermore, the electronic control system 10 controls the solid-liquid composite pelletizing machine 100, the dryer 200, and the high-temperature furnace 400, enabling fully automatic control, convenient operation, and improved production efficiency and product quality. On the other hand, the large amount of volatile organic gases emitted during the raw material regeneration process of spherical materials are high-calorific-value organic gases that can be used as fuel for high-temperature furnaces, which can effectively reduce the amount of natural gas used in high-temperature furnaces, greatly save energy, and reduce preparation costs.

[0036] See Figure 4A , Figure 4B , Figure 5 and Figure 6In this embodiment, the solid-liquid composite pelletizing machine 100 may include, for example, a pelletizer housing 110, a rotor assembly 130, a pelletizing disc 140, and a transmission mechanism 120. The pelletizer housing 110 has a cylindrical body 111 and a cover 112. The cover 112 is disposed on the cylindrical body 111. The powder inlet 1121 and the liquid inlet 1122 are located on the cover 112, and the powder inlet 1121 and the liquid inlet 1122 are connected to the cylindrical body 111, thereby allowing the negative electrode powder and the liquid binder to enter the solid-liquid composite pelletizing machine 100. The rotor assembly 130 is disposed inside the cylinder 111, the granulation disc 140 is disposed inside the cylinder 111 and located at the bottom of the cylinder 111, and the transmission mechanism 120 is disposed on one side of the granulator housing 110, and the transmission mechanism 120 is connected to the rotor assembly 130 and the granulation disc 140 to drive the rotor assembly 130 and the granulation disc 140.

[0037] Furthermore, the transmission mechanism 120 may, for example, consist of a rotor transmission assembly 121 and a granulation disc transmission assembly 122. See also Figure 5 The rotor transmission assembly 121 includes a first motor 1211, a driving pulley 1212, a driven pulley 1213, and a transmission assembly 1214. The first motor 1211 is driven by the driving pulley 1212, and the driven pulley 1213 is connected to the transmission assembly 1214. The driving pulley 1212 and the driven pulley 1213 are driven by each other, for example, through a transmission belt. The transmission assembly 1214 is connected to the rotor assembly 130. When the first motor 1211 is working, it drives the driving pulley 1212 to rotate. The driving pulley 1212 synchronously drives the driven pulley 1213. The driven pulley 1213 drives the rotor assembly 130 to rotate through the transmission assembly 1214. The granulation disc drive assembly 122 includes a second motor 1221, a reducer 1222, a drive gear 1223, and a slewing bearing 1224. The slewing bearing 1224 may be, for example, a single-row four-point angular contact ball-type external meshing slewing bearing. The second motor 1221 drives and connects to the reducer 1222. The reducer 1222 is connected to the drive gear 1223. The drive gear 1223 is connected to the slewing bearing 1224. The slewing bearing 1224 is connected to the granulation disc 140. The drive gear 1223 and the slewing bearing 1224 may be connected, for example, through gear meshing, so that when the second motor 1221 is working, it drives the granulation disc 140 to rotate.

[0038] See Figure 6The rotor assembly 130 may include, for example, a rotor shaft 131, rotor blades 132, a bottom scraper 133, and a side scraper 134. The rotor assembly 130 may be eccentrically disposed within the cylinder 111 and driven by a rotor drive assembly 121 to rotate at the eccentric position. The rotor blades 132 and the side scrapers 134 are spaced apart on the rotor shaft 131, and the bottom scraper 133 is disposed on the rotor shaft 131 near the granulation disc 140. The rotor blades 132, bottom scraper 133, and side scrapers 134 extend along the diametrical direction of the rotor shaft 131, and the bottom scraper 133 has a scraping portion 1331 bent toward the granulation disc 140. The bottom scraper 133 and side scraper 134 generate shearing and kneading forces, creating a speed difference with the material flow in the rotating granulation disc 140. The bottom scraper 133 and side scraper 134 continuously peel away material remaining at the bottom and edges of the tank and deliver it to the mixing and granulation area of ​​the granulation disc 140, promoting material discharge in a short time at the end of the mixing cycle. In one embodiment, the gap between the side scraper 134 and the cylinder 111 can be set to, for example, 3-5 mm, and the gap between the bottom scraper 133 and the granulation disc 140 can be set to 3-5 mm to avoid friction between the bottom scraper 133 and side scraper 134 and the cylinder 111 when the rotor assembly 130 rotates. A liner 1111 may also be provided inside the cylinder 111. An inspection door with a safety interlock device may also be provided on the cylinder 111. An observation door may also be provided on the cylinder 111, allowing for continuous observation of the material mixing process.

[0039] See Figure 7 and Figure 8 The cylinder 111 may also be equipped with a discharge gate 113 and a proximity switch. The discharge gate 113 may be located at the bottom of the cylinder 111 and is movably connected to the cylinder 111. The solid-liquid composite pelletizing machine 100 also includes a discharge device 150. The discharge device 150 is used to open or close the discharge gate 113 under the control of the electronic control system 10, and the proximity switch is used to provide feedback on the opening and closing status of the discharge gate 113 to the electronic control system 10. The proximity switch may be, for example, an inductive sensor. By setting the proximity switch, the proximity switch can detect the opening or closing of the discharge gate 113 and provide feedback to the electronic control system 10. The electronic control system 10 can control the operation of other equipment according to the opening or closing of the discharge gate 113. The unloading device 150 may include, for example, a hydraulic pump, a cylinder, a swing arm, and a drive shaft. The drive shaft is connected to the unloading gate 113, the hydraulic pump is connected to the cylinder, and the swing arm is connected between the cylinder and the drive shaft. The hydraulic pump controls the cylinder to drive the swing arm to reciprocate, thereby opening or closing the unloading gate 113 via the drive shaft. After the solid-liquid composite pelletizing machine 100 completes mixing and granulation, it may, for example, control the cylinder to extend and retract via the hydraulic pump to drive the swing arm to reciprocate. The swing arm is driven by the drive shaft to open and close the unloading gate for unloading.

[0040] See Figure 3 The negative electrode raw material regeneration system provided in this embodiment may, for example, further include: a powder metering buffer silo 20 and an additive metering tank 30. The powder metering buffer silo 20 may, for example, have a first discharge port connected to the solid-liquid composite pelletizing machine 100. Specifically, the powder metering buffer silo 20 may be connected to the powder inlet 1121 of the solid-liquid composite pelletizing machine 100. The first discharge port is also equipped with a permanent magnet separator to prevent metal foreign objects such as screws from entering the solid-liquid composite pelletizing machine 100. The powder metering buffer silo 20 is also equipped with a feeding speed control device, which may be, for example, a screw feeder or a soft rotary valve. The powder metering buffer silo 20 is electrically connected to the electronic control system 10. The powder metering buffer silo 20 is used to buffer and meter the negative electrode micro powder, and the feeding speed control device is used to control the feeding speed of the powder metering buffer silo 20 to the solid-liquid composite pelletizing machine 100. The additive metering tank 30 is also connected to the solid-liquid composite pelletizing machine 100. Specifically, the additive metering tank 30 can be connected to, for example, a liquid inlet 1122. The additive metering tank 30 is equipped with a liquid pump and an atomizing device. The liquid pump controls the flow rate of the liquid binder, and the atomizing device atomizes the liquid binder. The powder metering buffer silo 20 is used to buffer and meter the negative electrode powder. The negative electrode powder can be transferred to the powder metering buffer silo 20, for example, via a screw conveyor. The powder metering buffer silo 20 weighs the negative electrode powder, and once a set weight is reached, the conveying operation can be stopped, for example. The additive metering tank 30 is used to buffer and meter the liquid binder. The liquid binder is added to the additive metering tank 30, and the additive metering tank 30 weighs the added liquid binder, thereby ensuring that the liquid binder in the additive metering tank 30 is at a predetermined amount. Through the setting of the powder metering buffer silo 20 and the additive metering tank 30, the amount of negative electrode powder and liquid binder added can be well controlled, thereby improving the reuse rate of the negative electrode powder.

[0041] See also Figure 2 , Figure 3 and Figure 4AThe solid-liquid composite pelletizing machine 100 is also equipped with a discharge storage hopper 160 connected to the discharge gate 113. The negative electrode raw material regeneration system may, for example, also include a steep-angle sidewall conveyor 500, a bucket elevator 600, a finished product silo 710, and an automatic packaging machine 720. The steep-angle sidewall conveyor 500 is connected between the solid-liquid composite pelletizing machine 100 and the dryer 200. The dryer 200 may, for example, be equipped with a feed inlet. The steep-angle sidewall conveyor 500 is located between the discharge storage hopper 160 and the feed inlet, and is used to convey the spherical material from the discharge storage hopper 160 to the feed inlet of the dryer 200, thereby conveying the spherical material produced by the solid-liquid composite pelletizing machine 100 to the dryer 200. One end of the bucket elevator 600 is connected to the dryer 200, and the other end is connected to the finished product silo 710. The outlet of the finished product silo 710 is connected to the automatic packaging machine 720. After the spherical material is dried in the dryer 200, it can be transferred to the finished product silo 710 via the bucket elevator 600, and then packaged into ton bags, for example, by the automatic packaging machine 720. After being packaged, it can be transferred to the high-temperature furnace 400 for heat treatment.

[0042] See Figure 9 and Figure 10 The high-temperature furnace 400 may include, for example, a furnace body 410, a drive unit 420, a screw feeder 430, a discharge device 440, and a heating assembly 450. The furnace body 410 may include, for example, a furnace shell 411, a furnace lining 412, and a furnace pot 413. The furnace shell 411 can be welded from structural steel and plates, for example, with a simple structure. For ease of future maintenance of the furnace tank 413, the connection is made of high-strength bolts to form a whole. The furnace lining 412 can be made of aluminum silicate fiber folded blocks as insulation, compressed and fixed to the furnace shell 411 with heat-resistant steel rivets. The bottom is made of composite bricks to ensure heat is not lost. The furnace tank 413 is cylindrical and can be made of Q235 steel plate with a thickness ≥16mm, rolled into shape. The roller diameter can be, for example, φ1000*6500. Guide plates 4131 are evenly arranged on the inner wall of the furnace tank 413. The length of the guide plates 4131 is equal to the length of the thicker section of the furnace tank 413, and the thickness can be, for example, 10mm. The material of the guide plates 4131 is the same as that of the furnace tank 413. The guide plates 4131 can be, for example, spiral-shaped and can be, for example, fixed to the inner wall of the furnace tank 413 by tight welding. The drive unit 420 drives the furnace 413. The entire furnace body 410 can, for example, use a drive unit 420 to ensure uniform sintering and smooth material feeding and discharging within the furnace 413. The drive unit 420 can, for example, consist of a reducer, sprocket, chain, front and rear rollers, etc. The speed of the motor on the reducer is adjusted by a frequency converter. The motor can be controlled to rotate in both directions, and the speed adjustment is convenient, flexible, and reliable.

[0043] The screw feeder 430 has a barrel diameter of, for example, φ300, which increases the material flow. The motor power can be, for example, 4KW / unit, and it uses frequency conversion control. The feed port of the furnace 413 is integrated with the drive unit 420 and the furnace 413. The screw feeder 430 and the drive unit 420 can be connected by bolts, for example, extending directly into the furnace 413. The second feed port 431 of the screw feeder 430 is connected to the hopper. Material flows directly into the second feed port 431 and is then fed into the furnace 413 by the screw feeder 430. An exhaust stack is also provided on the furnace body 410. The screw feeder 430 and the exhaust stack are connected by a soft seal. The hopper and the screw feeder 430 are rigidly connected, with a hopper plate designed at the interface, allowing manual control of the material flow rate. The discharge device 440 may consist of, for example, a discharge bin, a discharge port, and a pneumatic valve. In operation, the spherical material, after being preheated and heated, flows directly from the furnace 413 into the discharge bin and is then conveyed to the packaging bag or the next process by the pneumatic valve through the discharge port.

[0044] The heating assembly 450 may employ multiple high-speed short-flame burners (e.g., three 150kW high-speed short-flame burners) for heating. In one embodiment, the electrical control system 10 may include, for example, an electrical control system and a combustion control system. The combustion control system controls the ignition of each burner, the switching between large and small flames, flame detection, the output of ignition success or failure signals, the implementation of the pre-ignition purging procedure, and the control of operating parameters (such as pressure, flow rate, etc.). Each combustion control system may, for example, be equipped with a burner controller, a burner transformer, and a complete gas pressure stabilization device. The furnace body 410 may, for example, be divided into three control sections along the longitudinal direction, with one burner in each section. The temperature control of each section employs advanced combustion technology. The furnace temperature control signal collected by the thermocouple in each section (one thermocouple per section) is compared with the set process temperature, and after PID calculation, the output signal controls the combustion time and frequency of each burner to control the furnace temperature. The advantage of this combustion method is that it can better control the uniformity of temperature in the furnace. The circulation of the furnace gas through strong stirring ensures a uniform temperature field distribution. After segmentation, the temperature at each point in the furnace can be guaranteed to have a consistent heating rate.

[0045] A main circuit breaker can be installed in the entire electrical control system 10 to control power supply and disconnection. This circuit breaker has overvoltage, overcurrent, and short-circuit protection functions to ensure safe and normal system operation. Power supply voltage and three-phase current indicators are installed on the main power lines to facilitate operators and maintenance personnel in understanding the overall operating status of the system. Each low-voltage electrical control system, combustion system, and DC system has its own isolated power supply and independent circuit breaker. Indicator lights are installed on the control cabinet to indicate whether each power supply system is functioning correctly. The electrical control system may consist of, for example, a touch screen, a temperature control cabinet, and a PLC inverter cabinet, and includes high-power heating circuits, temperature control circuits, action control circuits, and interlocking protection.

[0046] See Figure 11 The negative electrode raw material regeneration system provided in this embodiment can be used to execute a negative electrode raw material regeneration method to achieve the regeneration of the negative electrode raw material. The negative electrode raw material regeneration method may include, for example:

[0047] S11, Mixing and pelletizing step: The electronic control system controls the solid-liquid composite pelletizing machine to mix the negative electrode micro powder and liquid binder to form spherical materials according to the control parameters;

[0048] S13, Drying step: The electrical control system controls the dryer to dry the spherical material to obtain the dried spherical material;

[0049] S15, Heat treatment step: The electrical control system controls a high-temperature furnace to heat treat the dried spherical material to obtain regenerated negative electrode raw material.

[0050] The control parameters include the weight of the negative electrode powder, the weight of the liquid binder, and the feeding rate; before the mixing and pelletizing step described in S11, the system further includes: the electronic control system controls the powder metering buffer and the additive metering tank to simultaneously add the negative electrode powder and the liquid binder to the solid-liquid composite pelletizing machine according to the weight of the negative electrode powder, the weight of the liquid binder, and the feeding rate.

[0051] Between the drying step and the heat treatment step, a densification step is further included: densifying the spherical material. Specifically, the densification step involves either rolling the spherical material in a drum dryer or densifying it by static pressure.

[0052] To facilitate a clearer understanding of the negative electrode raw material regeneration system provided in this embodiment of the invention, the negative electrode raw material regeneration method will be described in detail below in conjunction with the negative electrode raw material regeneration system.

[0053] Specifically, users can set control parameters according to their needs. These parameters may include, for example, the weight of the negative electrode powder, the weight of the liquid binder, the feeding speed, the operating parameters of the solid-liquid composite pelletizing machine, the operating parameters of the dryer, and the operating parameters of the high-temperature furnace. The electrical control system 10 first transfers the negative electrode powder to the powder metering buffer silo 20 via a screw conveyor based on the weights of the negative electrode powder and the liquid binder. Then, it adds the liquid binder (e.g., liquid asphalt, dextrin aqueous solution, etc.) to the additive metering tank 30. Once the set weight is reached, the conveying operation stops, or the material level sensor detects material and sends feedback to the electrical control system 10 to stop the conveying operation. Then, for example, the rotor speed and granulation disc speed of the solid-liquid composite pelletizing machine 100 can be adjusted according to process requirements, and the time of each period and the required weights of the negative electrode powder and liquid binder can be set. The electrical control system 10 starts the solid-liquid composite pelletizing machine 100. After the solid-liquid composite pelletizing machine 100 sends a feeding signal, the electrical control system 10 simultaneously starts the feeding system for negative electrode micro powder and liquid binder. The feeding speed of the negative electrode micro powder can be controlled, for example, by controlling the frequency of the rotary valve. The flow rate of the liquid binder is controlled by the asphalt pump. After being atomized by the liquid atomizing device, it is added into the solid-liquid composite pelletizing machine 100 for mixing and granulation. Figure 12 The diagram shows the negative electrode micro powder and the granulated spherical material. The particle size of the spherical material can be, for example, around 10 mm. After the solid-liquid composite pelletizing machine 100 completes the preset mixing and granulation process, the electrical control system 10 controls the unloading device 150 to automatically open the bottom center unloading gate 113 to discharge the material. After the discharge is completed, the unloading device 150 automatically closes the unloading gate 113. The proximity switch can provide feedback to the electrical control system 10 on the opening and closing status of the unloading gate 113. When the unloading gate 113 is detected to be closed, the electrical control system 10 can control other equipment to operate.

[0054] The processed spherical material can be conveyed to the dryer 200 via a steeply inclined sidewall conveyor 500 for drying, thus obtaining dried spherical material. During the drying process, the spherical material can be rolled forward in a drum dryer, making it increasingly dense, thereby achieving densification while drying. Alternatively, after drying in the dryer 200, the spherical material can be further densified by methods such as static pressure. The purpose of densification is to ensure sufficient contact and adhesion between the negative electrode micropowders, which is beneficial for mass transfer during heat treatment and for the liquid binder to fully react with the negative electrode micropowders.

[0055] S15 Heat Treatment Step: The dried spherical material is transported to a high-temperature furnace for heat treatment to obtain regenerated negative electrode raw material. The high-temperature furnace 400 heat-treats the dried spherical material. Specifically, for example, the dried spherical material can be transported into the high-temperature furnace 400. In this heat treatment step, the temperature control method of the high-temperature furnace includes: gradually increasing the temperature to 550-1100℃ at a rate of 0.05-0.1℃ / min, and holding at this temperature for 24-96 hours. The holding temperature is 600-700℃. This process removes combustible volatiles from the spherical material and allows them to burn, providing a heat source for the high-temperature furnace. Simultaneously, it causes the negative electrode micropowder and the liquid binder in the spherical material to undergo decomposition, condensation, fusion, and cracking reactions to obtain regenerated negative electrode raw material, thus achieving the regeneration of the negative electrode raw material. The negative electrode raw material regeneration method provided by this invention can process the micro powder waste generated during the production of negative electrode materials to obtain regenerated negative electrode raw materials. The regenerated negative electrode raw materials can be recycled and applied to the preparation process of battery negative electrode materials as raw materials, solving the problem of low utilization value of tail powder, improving the utilization value of tail powder, and improving the overall utilization rate of raw materials for battery negative electrode materials.

[0056] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of this utility model. Provided that the technical features do not conflict, the structure is not contradictory, and the utility model's objective is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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. Such 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 this utility model.

Claims

1. A negative electrode raw material regeneration system, characterized in that, include: A solid-liquid composite pelletizing machine has a powder inlet and a liquid inlet. Negative electrode micro powder can enter the solid-liquid composite pelletizing machine through the powder inlet, and liquid binder can enter the solid-liquid composite pelletizing machine through the liquid inlet. The solid-liquid composite pelletizing machine is used to mix the negative electrode micro powder and the liquid binder to form spherical materials. A dryer is connected to the solid-liquid composite pelletizing machine. The dryer is a drum dryer, which is used to dry the spherical material and densify it by rolling. A high-temperature furnace is used to heat-treat the dried spherical material to obtain a regenerated negative electrode raw material. as well as An electrical control system is connected to the solid-liquid composite pelletizing machine, the dryer, and the high-temperature furnace. The electrical control system is used to control the operation of the solid-liquid composite pelletizing machine, the dryer, and the high-temperature furnace.

2. The negative electrode material regeneration system according to claim 1, wherein The solid-liquid composite pelletizing machine includes: The granulator housing has a cylindrical body and a cover, wherein the powder inlet and the liquid inlet are located on the cover and communicate with the cylindrical body; The rotor assembly is disposed within the cylinder. A granulation disc is disposed within the cylinder and located at the bottom of the cylinder; and A transmission mechanism is disposed on one side of the granulator housing, and the transmission mechanism is drively connected to the rotor assembly and the granulation disc to drive the rotor assembly and the granulation disc.

3. The negative electrode material regeneration system according to claim 2, wherein The transmission mechanism includes: The rotor transmission assembly includes a first motor, a driving pulley, a driven pulley, and a transmission assembly. The first motor is driven to the driving pulley, the driven pulley is connected to the transmission assembly, the driving pulley and the driven pulley are driven to each other, and the transmission assembly is connected to the rotor assembly. The granulation disc drive assembly includes a second motor, a reducer, a drive gear, and a slewing bearing. The second motor drives and connects to the reducer, the reducer is connected to the drive gear, the drive gear is connected to the slewing bearing, and the slewing bearing is connected to the granulation disc.

4. The negative electrode material regeneration system according to claim 2, wherein The rotor assembly includes a rotor shaft, rotor blades, a bottom scraper, and a side scraper. The rotor blades and the side scraper are spaced apart on the rotor shaft. The bottom scraper is disposed on the rotor shaft close to the granulation disc. The rotor blades, the bottom scraper, and the side scraper extend along the diameter direction of the rotor shaft. The length of the rotor blades is less than the length of the side scraper, and the bottom scraper has a scraping portion that bends toward the granulation disc.

5. The negative electrode material regeneration system according to claim 4, wherein The gap between the side scraper and the cylinder is 3-5 mm, and the gap between the bottom scraper and the granulation disc is 3-5 mm.

6. The negative electrode material regeneration system according to claim 2, wherein The cylinder is also equipped with a discharge gate and a proximity switch for the discharge gate, the discharge gate being movably connected to the cylinder; the solid-liquid composite pelletizing machine further includes: The unloading device includes a hydraulic pump, a cylinder, a swing arm, and a drive shaft. The drive shaft is connected to the unloading gate, the hydraulic pump is connected to the cylinder, and the swing arm is connected between the cylinder and the drive shaft. The hydraulic pump controls the cylinder to drive the swing arm to reciprocate, thereby opening or closing the unloading gate via the drive shaft. The proximity switch detects the opening and closing status of the unloading gate and provides feedback to the electronic control system.

7. The negative electrode material regeneration system according to claim 1, wherein Also includes: The powder metering buffer bin is equipped with a feeding speed control device. The powder metering buffer bin has a first discharge port, which is connected to the solid-liquid composite pelletizing machine. The powder metering buffer bin is used to buffer and meter the negative electrode micro powder. The first discharge port is also equipped with a permanent magnet separator. The powder metering buffer bin is electrically connected to the electrical control system. The feeding speed control device is used to control the feeding speed of the powder metering buffer bin to the solid-liquid composite pelletizing machine. An additive metering tank is connected to the solid-liquid composite pelletizing machine. The additive metering tank is used to buffer and meter the liquid binder. The additive metering tank is equipped with a liquid pump and an atomizing device. The liquid pump is used to control the flow rate of the liquid binder, and the atomizing device is used to atomize the liquid binder.

8. The negative electrode raw material regeneration system as described in claim 1, characterized in that, The negative electrode raw material regeneration system also includes a densification treatment device, which is used to densify the spherical material.

9. The negative electrode material regeneration system according to claim 6, wherein The solid-liquid composite pelletizing machine is also equipped with a discharge temporary storage hopper connected to the discharge gate; the negative electrode raw material regeneration system further includes: A steeply inclined sidewall conveyor is connected between the discharge storage hopper and the dryer, used to convey the spherical material to the dryer; Finished product silo, used to store the dried spherical material; An automatic packaging machine, connected to the finished product hopper, is used to package the dried spherical material; A bucket elevator is installed between the dryer and the finished product silo to transport the dried spherical material to the finished product silo.

10. The negative electrode material regeneration system according to claim 1, wherein The high-temperature furnace includes: The furnace body includes a furnace shell, a furnace lining, and a furnace tank. The furnace lining is fixed to the furnace shell, and the furnace tank is rotatably connected to the furnace body. The inner wall of the furnace tank is uniformly provided with guide plates, and the furnace tank has a feed port and a discharge port. A drive unit is connected to the furnace tank, and the drive unit is used to drive the furnace tank to rotate. The screw feeder has a second feed port. The screw feeder is connected to the furnace and extends into the furnace along the feed port. The dried spherical material enters the furnace through the second feed port via the screw feeder. The discharge device is connected to the discharge port; and A heating assembly, connected to the furnace body, is used to heat the furnace tank.

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