Material adding system for phosphorus-based positive electrode material and method for carbon-coating phosphorus-based positive electrode material

Abstract

The application discloses a material adding system for phosphorus-based positive electrode materials and a method for carbon-coating phosphorus-based positive electrode materials, and relates to the technical field of lithium iron phosphate production batching, and comprises an automatic sugar dissolving system for independently adding an organic carbon source, which comprises feeding units, metering units, dissolving units, conveying, filtering and iron removing units connected in sequence; and a self-control unit electrically connected with the feeding units, the metering units, the dissolving units and the conveying, filtering and iron removing units, respectively, and used for controlling the automatic operation of the feeding units and feeding of the metering units, controlling the automatic operation of the metering units and discharging of the dissolving units, controlling the heating of the heating units on the dissolving tanks to promote the dissolution of glucose, and controlling the formation of micro-negative pressure by the dust removing units when the dissolving tanks are discharged to inhibit water vapor backflow. The material adding system for phosphorus-based positive electrode materials can improve the uniformity of carbon-coating, and each process step can be automatically realized integrally, thereby reducing the disadvantages caused by manual operation.

Description

Technical Field

[0001] This invention relates to the field of lithium iron phosphate production feedstock technology, and in particular to a material addition system for phosphorus-based cathode materials and a method for carbon coating phosphorus-based cathode materials. Background Technology

[0002] In the production of lithium iron phosphate cathode materials, the compounding process is a crucial step in ensuring product consistency and electrochemical performance. Carbon sources, as important auxiliary materials, must be added to the dispersion tank in precise proportions. Traditional carbon sources include organic carbon sources, such as glucose, which coats the cathode material matrix and significantly improves the conductivity of lithium iron phosphate cathode materials. Current technology typically involves directly mixing glucose in solid form with other raw materials during compounding. For example, carbon source compounds (such as glucose) are automatically weighed and added to the dispersion tank along with lithium, iron, and phosphorus sources using a weighing and batching machine. Glucose is then mixed with other raw materials and ground together. However, traditional production methods generally involve manual unpacking, weighing, and feeding of glucose. With this traditional manual operation, key process parameters such as stirring time, dissolution temperature, and feeding rate rely solely on on-site experience, making precise control and real-time recording impossible. Furthermore, the production process lacks data retention, trend curves, and material traceability, making it impossible to trace the root cause of batch anomalies. Meanwhile, the entire process relies on manual judgment and operation, lacking procedural error prevention mechanisms. This makes it highly susceptible to errors such as incorrect feeding sequence, feeding before metering is completed, feeding before tank cleaning, and operating beyond parameter limits. These errors can further lead to product fluctuations, material waste, and even equipment failure. As the lithium iron phosphate industry continues to demand higher standards for product consistency, production automation, process traceability, on-site environmental protection, and intelligent production, traditional manual sugar dissolving methods are no longer suitable for modern production lines and there is room for improvement.

[0003] Alternatively, lithium, iron, and phosphorus sources can be mixed together as the main material, and an intelligent system can be used to replace manual labor to separately transport carbon sources (such as glucose) as auxiliary materials in the form of solid powder to the mixing tank to mix with the main material. However, glucose is hygroscopic, and during the mixing process, there are problems such as low solubility, slow dissolution, clumping, pipe blockage, and wall adhesion, which affect the metering accuracy and the uniformity of mixing. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a material addition system for phosphorus-based cathode materials. Each unit of its automated sugar dissolving system can be automatically controlled by a self-control unit, effectively overcoming various drawbacks of manual operation. Furthermore, this application, by setting up an independent dissolving unit to pre-dissolve the organic carbon source (e.g., glucose), avoids the agglomeration of glucose solid particles during grinding; and by heating and dissolving, it ensures complete dispersion of glucose, improving the uniformity of subsequent carbon coating; simultaneously, the micro-negative pressure dust removal of the dust collector prevents water vapor backflow from interfering with metering accuracy during the dissolving process.

[0005] A material addition system for phosphorus-based cathode materials according to an embodiment of the present invention includes: a feeding unit, a metering unit, a dissolving unit, and a conveying, filtering, and iron removal unit, wherein the feeding unit, the metering unit, the dissolving unit, and the conveying, filtering, and iron removal unit are connected in sequence; the dissolving unit includes at least one dissolving tank, and the dissolving tank is provided with a heating element and a dust removal element; and an automatic control unit, which is electrically connected to the feeding unit, the metering unit, the dissolving unit, and the conveying, filtering, and iron removal unit respectively. The automatic control unit is used to control the feeding unit to operate automatically and feed material to the metering unit, control the metering unit to operate automatically and discharge material to the dissolving unit, control the heating element to heat the dissolving tank to promote glucose dissolution, control the dust removal element to form a slight negative pressure when discharging material from the dissolving tank to suppress water vapor backflow, and control the conveying, filtering, and iron removal unit to operate automatically and convey material to a premixing tank.

[0006] According to the material addition system for phosphorus-based cathode materials of the present invention, the automated sugar dissolving system automatically controls the automatic control unit to be connected to the feeding unit, metering unit, dissolving unit, and conveying, filtering and iron removal unit respectively. This enables the automatic control unit to control each unit to operate automatically, so that each process step can be realized automatically in an integrated manner, thereby reducing the drawbacks of manual operation and enhancing the reliability, stability and efficiency of the system.

[0007] According to some embodiments of the present invention, a material addition system for phosphorus-based cathode materials includes a feeding unit comprising a ton bag feeding station, a temporary storage bin, and a first iron separator. The ton bag feeding station, the temporary storage bin, and the first iron separator are sequentially connected and electrically connected to an automatic control unit. The automatic control unit is used to control the ton bag feeding station to feed material into the temporary storage bin, control the temporary storage bin to selectively feed material into the first iron separator, and control the first iron separator to remove metal foreign matter from the material before feeding it into the inlet of the metering unit.

[0008] According to some embodiments of the present invention, a material addition system for phosphorus-based cathode materials, the feeding unit further includes a first dust collector, which is installed in the temporary storage bin and electrically connected to the automatic control unit. The automatic control unit is used to control the first dust collector to remove dust from the temporary storage bin. And / or, the feeding unit further includes a rotary valve, which is installed between the temporary storage bin and the first iron separator. The rotary valve is electrically connected to the automatic control unit, which controls the rotary valve to feed material evenly from the temporary storage bin to the first iron separator.

[0009] According to some embodiments of the present invention, a material addition system for phosphorus-based cathode materials is provided in the ton bag feeding station, wherein the feeding port is used for sealed feeding of glucose after unpacking the ton bag; The automatic control unit is also configured to be electrically connected to the overhead crane, and the automatic control unit is used to control the overhead crane to lift the ton bag of glucose to the feeding port.

[0010] According to some embodiments of the present invention, a material addition system for phosphorus-based cathode materials includes a metering unit comprising a metering bin and a screw feeder, wherein the metering bin and the screw feeder are sequentially connected between the feeding unit and the dissolving unit, and the metering bin and the screw feeder are electrically connected to an automatic control unit, wherein the automatic control unit is used to control the metering bin to automatically meter and control the screw feeder to automatically feed material from the metering bin to the dissolving unit.

[0011] According to some embodiments of the present invention, a material addition system for phosphorus-based cathode materials includes a dissolution unit comprising at least two dissolution tanks, a screw feeder having at least two discharge ports, and at least two dissolution tanks being respectively connected one-to-one between the at least two discharge ports and the inlet of the conveying, filtering and iron removal unit; And / or, the metering chamber is connected below the outlet of the feeding unit; The screw feeder is connected below the outlet of the metering chamber and above the inlet of the dissolving unit.

[0012] According to some embodiments of the present invention, in a material addition system for phosphorus-based cathode materials, each of the dissolving tanks is further provided with a mass flow meter, a first filter, and a stirring element. The mass flow meter, the first filter, the dust removal element, the stirring element, and the heating element are respectively electrically connected to the automatic control unit. The automatic control unit is used to control the automatic operation of the mass flow meter, the first filter, the dust removal element, the stirring element, and the heating element.

[0013] According to some embodiments of the present invention, a material addition system for phosphorus-based cathode materials includes a conveying, filtering, and iron removal unit comprising a pneumatic diaphragm pump, a second filter, and a second iron remover. The pneumatic diaphragm pump, the second filter, and the second iron remover are electrically connected to the automatic control unit, which controls the automatic operation of the pneumatic diaphragm pump, the second filter, and the second iron remover. And / or, the conveying, filtering and iron removal unit is provided with multiple conveying outlets, and the multiple conveying outlets are adapted to be connected to the multiple premixing tanks one by one.

[0014] The present invention also proposes a method for carbon coating of phosphorus-based cathode materials, including the step of independently metering and dissolving an organic carbon source and then adding it to other materials for mixing, wherein the independent metering and dissolving of the organic carbon source is carried out using the material addition system for phosphorus-based cathode materials as described in any of the above embodiments.

[0015] According to some embodiments of the present invention, a method for carbon coating of phosphorus-based cathode materials, wherein the independently metered dissolution of the organic carbon source includes the following steps: S1: The organic carbon source is sealed and fed into the feeding unit, and the organic carbon source is transported to the metering unit through the automatic control unit; S2: Control the metering unit to weigh the organic carbon source and quantitatively feed it into the dissolving unit; S3: Add a set amount of solvent to the dissolution unit, and simultaneously control the operation of the heating element and the dust removal element to dissolve and form an organic carbon source solution.

[0016] According to some embodiments of the present invention, in the method for carbon coating of phosphorus-based cathode materials, in the S2 metering step, the automatic control unit adopts a weight reduction metering method, calculates the amount of material fed in real time through the weight data changes of the metering unit, and controls the screw feeder to stop feeding when the preset target value is reached; And / or, in the S3 dissolution step, the amount of solvent added is controlled according to the feedback from the mass flow meter, and a cleaning allowance is reserved in each batch of solvent usage for automatic rinsing of the dissolution tank and pipeline after dissolution is completed. And / or, the dissolving unit includes at least two dissolving tanks, and controls at least two dissolving tanks to operate alternately: when one dissolving tank is dissolving, the other dissolving tank is in a waiting or cleaning state; when one dissolving tank is emptied, the automatic control unit automatically switches to the other dissolving tank to supply material, thereby achieving continuous material supply; And / or, the automatic control unit is a DCS system, which remotely controls each unit from the central control room and records stirring time, dissolution temperature, feed amount, pure water flow rate, tank pressure, and equipment status in real time, forming trend curves and material traceability records.

[0017] According to some embodiments of the present invention, the method for carbon coating of phosphorus-based cathode materials further includes step S4, which controls the conveying, filtering and iron removal unit to pressurize and convey the organic carbon source solution to the premixing tank; wherein, the automatic control unit collects and stores process parameters in real time in steps S1 to S4, and performs interlock control on the execution conditions of each step, and automatically executes the next step when the preset conditions are met. Preferably, the preset conditions include at least one of the following: The next batch of materials must not be fed in while the previous batch has not been completely cleaned. Water must be added to the dissolving tank before metering and feeding can be started. The conveyor must not be started before the metering is completed; If the dissolution temperature or dissolution time has not reached the preset threshold, the process must not proceed to the conveying step. The system will automatically alarm and shut down when temperature or flow exceeds the limit. If the valve is in an abnormal state, the next action will be blocked.

[0018] The method for carbon coating phosphorus-based cathode materials described above has the same advantages over existing technologies as the material addition system for phosphorus-based cathode materials described above, and will not be repeated here.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram showing the connection of the main components of the material addition system for phosphorus-based cathode materials according to an embodiment of the present invention; Figure 2 This is a schematic diagram showing the connections of various units in a material addition system for phosphorus-based cathode materials according to an embodiment of the present invention. Figure 3 This is a schematic diagram of a method for carbon coating of phosphorus-based cathode materials according to an embodiment of the present invention.

[0021] Figure label: Automated sugar dissolving system 100 1. Ton bag feeding station; 2. First dust collector; 3. Temporary storage bin; 4. Rotary valve; 5. First iron separator; 6. Metering bin; 7. Screw feeder; 8. Dissolving tank; 9. Pneumatic diaphragm pump; 10. Second filter; 11. Second iron separator; 12. Premixing tank. Feeding unit 101, metering unit 102, dissolving unit 103, conveying, filtering and iron removal unit 104, automatic control unit 105. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] It should be noted that in the production process of lithium iron phosphate cathode materials, the compounding process is a key step to ensure product consistency and electrochemical performance. Glucose, as an important carbon source auxiliary material, needs to be added to the dispersion tank in a precise ratio. Traditional production methods generally use manual unpacking, manual weighing, and manual feeding to complete the addition of glucose. This method has many drawbacks: First, glucose powder is prone to absorbing moisture and clumping in the air, and its dissolution rate is slow. Manual feeding can easily lead to localized agglomeration and incomplete dissolution, causing problems such as pipe blockage and wall adhesion. Its hygroscopicity also reduces the accuracy of the feeding amount. Second, manual metering relies on experience, resulting in poor metering accuracy and large batch-to-batch errors, which directly affect the uniformity of carbon coating on lithium iron phosphate and cause fluctuations in the product's electrical performance. Third, manual handling, unpacking, and weighing are labor-intensive and inefficient, making it difficult to meet the needs of continuous and large-scale production. In addition, metering and feeding powdered materials in an open state can easily generate dust, causing material loss and polluting the working environment, which is harmful to the health of operators. Finally, the traditional process lacks dedicated dust removal, iron removal, and filtration devices. Dust rising and water vapor backwashing can interfere with metering accuracy, and environmental impurities and metal foreign objects can easily mix into the material, affecting battery safety and cycle life. Furthermore, manual operation cannot achieve closed and automated connection, and it is difficult to effectively clean the material adhering to the inner wall of the tank and pipes, further aggravating batch errors and making it impossible to achieve stable feeding of multiple lines simultaneously.

[0025] More significantly, the traditional manual operation mode lacks a centralized control system, making remote control impossible. Key process parameters such as stirring time, dissolving temperature, and feeding rate rely solely on on-site experience, hindering precise control and real-time recording. The production process lacks data retention, trend curves, and material traceability, making it impossible to trace the root cause of batch anomalies. Furthermore, the entire process depends on manual judgment and operation, lacking procedural error prevention mechanisms. This makes it highly susceptible to errors such as incorrect feeding sequence, premature feeding before metering, feeding without cleaning the tank, and exceeding parameter limits, further causing product fluctuations, material waste, and even equipment failure. As the lithium iron phosphate industry increasingly demands product consistency, production automation, process traceability, on-site environmental protection, and intelligent production, traditional manual sugar dissolving methods are no longer suitable for modern production lines. Based on this, the present invention proposes a material addition system for phosphorus-based cathode materials. The material addition system for phosphorus-based cathode materials includes an automated sugar dissolving system 100. The automated sugar dissolving system 100 integrates automatic feeding, accurate metering, rapid dissolution, dust and iron removal, closed conveying, and automatic cleaning. It is a fully automated system with DCS full-process automated control, data visualization and traceability, and program error prevention functions. This solves a series of technical problems such as high labor intensity, low precision, high pollution, slow dissolution, high risk of foreign matter, uncontrollable process, lack of traceability, and easy occurrence of operational errors.

[0026] The following is for reference. Figures 1-2This invention describes a material addition system for phosphorus-based cathode materials according to embodiments of the present invention. The material addition system includes an automated sugar dissolving system 100, which is used to independently add organic carbon sources, and as... Figure 2 As shown, the automated sugar dissolving system 100 includes a feeding unit 101, a metering unit 102, a dissolving unit 103, a conveying, filtering and iron removal unit 104, and an automatic control unit 105.

[0027] The feeding unit 101, metering unit 102, dissolving unit 103, and conveying, filtering, and iron removal unit 104 are connected in sequence. After glucose is supplied to the feeding unit 101 via ton bags, the internal structure of the feeding unit 101 can perform preliminary processing of the material, such as sealing and feeding, and removing metal foreign objects. The material is then fed to the metering unit 102, which further processes the material, such as metering and feeding, and conveys the material to the dissolving unit 103. The dissolving unit 103 can dissolve the material and, during the dissolving process, can also perform functions such as flow monitoring, dust removal, stirring, or heating. The dissolved material is then transported to the conveying, filtering, and iron removal unit 104, which can convey the dissolved material to the premixing tank 12. During the conveying process, it can also perform filtration and iron removal to enhance the material processing effect.

[0028] The dissolving unit includes at least one dissolving tank 8, which can be set as one, two, three or more. The dissolving tank 8 is equipped with a heating element and a dust removal element. The heating element can heat the dissolving tank 8 to improve the dissolution efficiency of glucose in the dissolving tank 8. The dust removal element can form a slight negative pressure when discharging material into the dissolving tank 8 to suppress water vapor backflow.

[0029] like Figure 2 As shown, the automatic control unit 105 is electrically connected to the feeding unit 101, the metering unit 102, the dissolving unit 103, and the conveying, filtering, and iron removal unit 104, respectively. That is, the feeding unit 101, the metering unit 102, the dissolving unit 103, and the conveying, filtering, and iron removal unit 104 can all transmit and send control signals to the automatic control unit 105, so that the automatic control unit 105 can automatically control the feeding unit 101, the metering unit 102, the dissolving unit 103, and the conveying, filtering, and iron removal unit 104 and their respective functions. This allows the feeding unit 101, the metering unit 102, the dissolving unit 103, and the conveying, filtering, and iron removal unit 104 to automatically perform their respective functions without the need for a large amount of manual operation.

[0030] In actual operation, the automatic control unit 105 is used to control the feeding unit 101 to operate automatically and feed materials to the metering unit 102, control the metering unit 102 to operate automatically and feed materials to the dissolving unit 103, control the heating element to heat the dissolving tank 8 to promote glucose dissolution, control the dust removal element to form a slight negative pressure when discharging materials into the dissolving tank 8 to suppress water vapor backflow, and control the conveying, filtering and iron removal unit 104 to operate automatically and convey materials to the premixing tank 12. In other words, the automatic control unit 105 can automatically control the function of the feeding unit 101 so that the feeding unit 101 can operate automatically and complete the feeding action without manual intervention. The automatic control unit 105 can also automatically control the function of the metering unit 102 so that the metering unit 102 can operate automatically and complete the metering action without manual intervention. Furthermore, the automatic control unit 105 can automatically control the function of the dissolving unit 103 so that the dissolving unit 103 can operate automatically and complete the dissolving action without manual intervention. Similarly, the automatic control unit 105 can automatically control the function of the conveying, filtering and iron removal unit 104 so that the conveying, filtering and iron removal unit 104 can operate automatically and complete the conveying, filtering and iron removal action without manual intervention.

[0031] It should be noted that the automatic control unit 105 can adopt a DCS-based system to achieve full-process automated control. That is, all devices of the automated sugar dissolving system 100 can be connected to the DCS system, supporting remote control from the central control room without the need for on-site manual intervention.

[0032] According to the material addition system for phosphorus-based cathode materials of the present invention, the automated sugar dissolving system 100 automatically controls the automatic control unit 105 to the feeding unit 101, the metering unit 102, the dissolving unit 103, and the conveying, filtering and iron removal unit 104, so that the automatic control unit 105 can control each unit to operate automatically, so that each process step can be realized automatically in an integrated manner, thereby reducing the drawbacks of manual operation and enhancing the reliability, stability and efficiency of the automated sugar dissolving system 100.

[0033] In some embodiments, such as Figure 1 As shown, the feeding unit 101 includes a ton bag feeding station 1, a temporary storage bin 3, and a first iron remover 5. The ton bag feeding station 1, the temporary storage bin 3, and the first iron remover 5 are connected in sequence. That is, the material entering the ton bag feeding station 1 can enter the temporary storage bin 3 for temporary storage. When it is necessary to feed material into the metering unit 102, the material in the temporary storage bin 3 is fed into the metering unit 102 after the metal foreign matter is removed by the first iron remover 5.

[0034] The ton bag feeding station 1, the temporary storage bin 3, and the first iron separator 5 are electrically connected to the automatic control unit 105. That is, the automatic control unit 105 can transmit control signals to the ton bag feeding station 1, the temporary storage bin 3, and the first iron separator 5 to realize remote control of the ton bag feeding station 1, the temporary storage bin 3, and the first iron separator 5. This enables the ton bag feeding station 1, the temporary storage bin 3, and the first iron separator 5 to automatically execute the feeding process, reducing manual operation during the feeding stage.

[0035] In specific execution, the automatic control unit 105 is used to control the ton bag feeding station 1 to feed material into the temporary storage bin 3. If a control valve is set between the ton bag feeding station 1 and the temporary storage bin 3, the material can be selectively opened or closed by the control valve so that the material can be selectively and automatically entered from the ton bag feeding station 1 into the temporary storage bin 3 without manual operation. The automatic control unit 105 is also used to control the temporary storage bin 3 to selectively feed material to the first iron separator 5 so that the temporary storage bin 3 can automatically feed material to the first iron separator 5 without manual operation to connect the temporary storage bin 3 and the first iron separator 5. The automatic control unit 105 is also used to control the first iron separator 5 to feed material to the inlet of the metering unit 102 after removing metal foreign objects. For example, the automatic control unit 105 can control the first iron separator 5 to start operation to achieve automatic iron removal and ensure the iron removal effect.

[0036] The first iron separator 5 can be a rotary iron separator, which has the following advantages: It enables dynamic iron removal: the ring-shaped magnetic rod assembly is continuously rotated by a geared motor, breaking up the material and preventing agglomeration, ensuring full contact between iron impurities and the magnetic field for efficient separation. The rotational motion effectively avoids the material bridging and clogging problems common in traditional grid-type iron separators, making it particularly suitable for powder materials with poor flowability and high viscosity. In this embodiment, the magnetic field strength of the rotary iron separator can reach 12000-14000 Gauss, capturing iron filings as small as 0.1mm, and even adsorbing weakly magnetic impurities such as stainless steel particles. Currently available rotary iron separators support both manual cleaning and automatic iron unloading modes. Some models, such as CRG150 and JXZ-DN150, or other models, can be used. The rotary iron separator can be equipped with scrapers or a double-layer sleeve structure, enabling continuous or intermittent automatic iron discharge, reducing downtime for maintenance. Therefore, a reliable iron removal process can be achieved.

[0037] In some embodiments, such as Figure 1 As shown, the feeding unit 101 also includes a first dust collector 2, which is installed in the temporary storage bin 3 and is electrically connected to the automatic control unit 105. The automatic control unit 105 is used to control the first dust collector 2 to remove dust from the temporary storage bin 3. Thus, the automatic control unit 105 can control the first dust collector 2 to automatically remove dust from the temporary storage bin 3, thereby reducing the amount of dust in the temporary storage bin 3 and facilitating automatic dust-free feeding.

[0038] Among them, the first dust collector 2 can be a dust collector with a fan. The dust collector with a fan integrates the functions of a fan and dust removal. It can actively suck up and purify dust-laden air. It has the characteristics of high-efficiency dust removal, compact structure, convenient installation, low energy consumption, wide applicability, and helps to ensure the dust removal effect.

[0039] Specifically, such as Figure 1 As shown, the first dust collector 2 can be installed on top of the temporary storage chamber 3 so that the first dust collector 2 can remove dust from the top inside the temporary storage chamber 3.

[0040] And / or, in some embodiments, the feeding unit 101 further includes a rotary valve 4, which is installed between the temporary storage bin 3 and the first iron separator 5, such as... Figure 1 As shown, the temporary storage bin 3 is located above the first iron separator 5, while the rotary valve 4 is located below the temporary storage bin 3 and above the first iron separator 5, so that the material in the temporary storage bin 3 enters the first iron separator 5 after passing through the rotary valve 4.

[0041] The rotary valve 4 is electrically connected to the automatic control unit 105. The automatic control unit 105 is used to control the rotary valve 4 to feed material evenly from the temporary storage bin 3 to the first iron remover 5. Thus, the rotation of the rotary valve 4 can be controlled to selectively feed material from the temporary storage bin 3 to the first iron remover 5.

[0042] Furthermore, by setting a rotary valve 4, continuous and precise control of the medium flow rate can be achieved by changing the rotation angle of the valve core (such as a ball, butterfly plate, or eccentric valve core). In this application, the rotary valve 4 operates at a 90° rotation, opening and closing rapidly, suitable for frequent switching conditions, and can improve the system response speed. Based on the setting of the rotary valve 4, in the closed state, a tight metal-to-metal or soft seal can be achieved, effectively isolating upstream and downstream media, preventing leakage, and ensuring process safety. It is especially suitable for cathode material fields containing particles, corrosive conditions, or high-temperature and high-pressure conditions.

[0043] In some embodiments, the ton bag feeding station 1 is provided with a feeding port for sealing the ton bag glucose after unpacking. The automatic control unit 105 is also electrically connected to the overhead crane and is used to control the overhead crane to lift the ton bag glucose to the feeding port. Thus, when feeding, the overhead crane can be controlled to lift the ton bag glucose to above the feeding port and untie the binding strap of the ton bag glucose so that the material in the ton bag glucose can automatically enter the feeding port. The feeding positions of the two can be sealed. The ton bag glucose and the feeding port are fitted together to form a sealed connection to ensure that the material enters the ton bag feeding station 1 in a sealed manner.

[0044] In this way, the feeding stage can also be more automatically controlled by the automatic control unit 105, effectively reducing manual operation and ensuring feeding reliability.

[0045] Therefore, in actual operation, the ton bag of glucose can be hoisted to the feeding port by a gantry crane, the ton bag belt can be untied to achieve sealed feeding, the glucose is fed evenly through the rotary valve 4, and after the first iron remover 5 removes the metal foreign objects, it enters the metering unit 102 to achieve sealed dust-free feeding and primary iron removal. The entire operation is coordinated and timed by the automatic control unit 105.

[0046] In some embodiments, such as Figure 1 As shown, the metering unit 102 includes a metering chamber 6 and a screw feeder 7. The metering chamber 6 and the screw feeder 7 are connected in sequence between the feeding unit 101 and the dissolving unit 103. That is, the material output from the first iron remover 5 in the feeding unit 101 can enter the metering chamber 6 for material metering. Specifically, a weight reduction metering method can be adopted to achieve accurate and controllable feeding weight.

[0047] In this embodiment, a metering chamber 6 is set up and connected to the control unit 105, which can realize the functions of fixed weight measurement, automatic loading, dynamic matching, intelligent early warning and data management. The data management can support weighing data recording, flow display, remote communication and access to the automatic control unit 105, which is convenient for analysis and control.

[0048] Furthermore, the screw feeder 7 can perform continuous conveying and quantitative feeding to enhance the feeding efficiency of the metering unit 102. This embodiment preferably uses a high-efficiency screw structure, which has a large conveying capacity per unit time and operates smoothly and reliably. The cylinder adopts a sealed design, which can reduce material contamination and environmental dust. Moreover, key components such as bearings are placed outside the housing, which can reduce the impact of dust on the bearings when used in the field of cathode materials. Additionally, nylon seals are used to adapt the sliding bearings, which can extend the life of the screw feeder 7. At the same time, each transmission part adopts a floating connection, which can avoid material jamming when used for the powder transmission of cathode materials. Furthermore, in this embodiment, it can be interfaced with the automatic control unit 105 to achieve remote monitoring and intelligent control, improving the level of production automation.

[0049] Furthermore, the metering chamber 6 and the screw feeder 7 are electrically connected to the automatic control unit 105. The automatic control unit 105 is used to control the automatic metering of the metering chamber 6 and the automatic feeding of the screw feeder 7 from the metering chamber 6 to the dissolving unit 103. In this way, the automatic control unit 105 can output control commands to the metering chamber 6 and the screw feeder 7 so that both the metering chamber 6 and the screw feeder 7 can operate automatically, realize the automation of the metering process, reduce labor costs, and reduce the drawbacks of manual operation.

[0050] In some embodiments, the dissolving unit 103 includes at least two dissolving tanks 8, and the screw feeder 7 is provided with at least two discharge ports. The at least two dissolving tanks 8 are respectively connected one-to-one between the at least two discharge ports and the inlet of the conveying, filtering and iron removal unit 104, so that the screw feeder 7 can feed the at least two dissolving tanks 8 respectively, thereby improving the feeding efficiency and dissolving efficiency. That is, the dissolving tank 8 is not limited to one, but can be two, three or more. At the same time, the discharge ports can also be two, three or more, and the number of discharge ports can correspond one-to-one with the number of dissolving tanks 8.

[0051] Specifically, such as Figure 1 As shown, the screw feeder 7 can be configured with two discharge ports, located on opposite sides of the screw feeder 7. Simultaneously, two dissolving tanks 8 are configured, located on opposite sides below the screw feeder 7, so that each dissolving tank 8 is connected to one of the two discharge ports. This allows the screw feeder 7 to supply material to both dissolving tanks 8 during its rotation, enabling the two tanks to operate alternately. A single batch can meet the required powder dissolution volume for production, and the automatic control unit 105 can automatically switch between the two dissolving tanks 8 based on their operating conditions, ensuring continuous material supply.

[0052] In some embodiments, each dissolving tank 8 is equipped with a mass flow meter, a first filter, a dust collector, a stirrer, and a heater. The mass flow meter, the first filter, the dust collector, the stirrer, and the heater are electrically connected to an automatic control unit 105. The automatic control unit 105 is used to control the mass flow meter, the first filter, the dust collector, the stirrer, and the heater to operate automatically. In this way, the mass flow meter, the first filter, the dust collector, the stirrer, and the heater of the dissolving tank 8 can be controlled separately by the automatic control unit 105, so that each functional component can automatically realize its function without the need for manual intervention to operate the functional components, thereby reducing operational errors or instability.

[0053] Among them, the mass flow meter can directly measure the mass flow rate of the fluid in the dissolving tank 8 and simultaneously acquire parameters such as density and temperature. In this application, the preferred mass flow meter can achieve high-precision measurement and has high anti-interference ability. At the same time, it has no moving parts inside, low maintenance cost and long service life.

[0054] The first filter can be a dust filtration device to filter internal dust. The dust removal component is constructed as a secondary dust removal system and can perform secondary dust removal, so that the material can be dissolved in the dissolving tank 8 without dust. The stirring component can actively stir the material in the dissolving tank 8, and the heating component can actively heat the material in the dissolving tank 8 to enhance the dissolving effect. Among them, the heating component can adopt a heating cable heating structure.

[0055] Therefore, in actual operation, the amount of pure water added can be precisely controlled by a mass flow meter. A dust filter device is installed at the top of the dissolving tank 8 and connected to a secondary dust removal system. When discharging, the automatic control unit 105 activates the dust removal device, creating a slight negative pressure inside the dissolving tank 8 to suppress dust diffusion and water vapor rising, thus preventing water vapor from interfering with metering accuracy. At the same time, multiple coils of heating tape are arranged at the lower end of the dissolving tank 8 according to process requirements. Heating improves dissolution efficiency, and combined with stirring, it achieves rapid and uniform dissolution of powder, preventing agglomeration and clumping. A certain amount of pure water is reserved for cleaning in each batch for automatic cleaning of the tank wall and pipes, reducing batch errors caused by material sticking to the wall.

[0056] In some embodiments, the metering chamber 6 is connected below the outlet of the feeding unit 101, so that the material in the feeding unit 101 can enter the metering chamber 6 under the action of gravity. The screw feeder 7 is connected below the outlet of the metering chamber 6 and above the inlet of the dissolving unit 103. This allows the material output from the feeding unit 101 to pass sequentially through the metering chamber 6 and the screw feeder 7 under the action of gravity into the dissolving unit 103, achieving gravity-assisted automatic feeding.

[0057] Specifically, such as Figure 1 As shown, the temporary storage bin 3, rotary valve 4, and first iron separator 5 of the feeding unit 101 are arranged sequentially from top to bottom. The first iron separator 5 is located above the metering bin 6, and the bottom of the first iron separator 5 is connected to the top of the metering bin 6. The bottom outlet of the metering bin 6 is connected to a screw feeder 7. Two discharge ports are provided on both sides of the screw feeder 7, and two dissolving tanks 8 are provided on both sides of the bottom of the screw feeder 7. The two discharge ports can be connected to the two dissolving tanks 8 through pipelines respectively. Thus, the material can flow from the temporary storage bin 3 through multiple components to the dissolving tank 8 under the action of gravity, reducing the need for manual operation.

[0058] In some embodiments, such as Figure 1 As shown, the conveying, filtering, and iron removal unit 104 includes a pneumatic diaphragm pump 9, a second filter 10, and a second iron remover 11. The pneumatic diaphragm pump 9, the second filter 10, and the second iron remover 11 are electrically connected to an automatic control unit 105, which controls the automatic operation of each component. Thus, the automatic control unit 105 can control the pneumatic diaphragm pump 9 to drive the material transport in the pipeline, ensuring the power for material conveying. The first filter can filter undissolved particles and mechanical impurities in the material output from the dissolving tank 8, and the second iron remover 11 can perform deep demagnetization of the material. This ensures that the material conveyed to the premixing tank 12 meets the requirements.

[0059] Among them, the pneumatic diaphragm pump 9 can be a large-diameter PP pneumatic diaphragm pump 9, which can efficiently transport large flow rates of highly corrosive, particulate, or high-viscosity media. The large-diameter PP pneumatic diaphragm pump 9 used in this application is made of PP material, which has stable performance relative to most corrosive chemicals, and the density of PP is only 0.9–1.1 g / cm³, which is more than 50% lighter than stainless steel pumps, making it easy to move and install. Since the diaphragm can completely isolate the medium from the moving parts, there is no need to set up a separate mechanical seal structure, which can eliminate the risk of leakage of toxic and harmful media. It can also achieve stepless precise control of flow rate and head by adjusting the air source pressure (0.4–0.7MPa), which is suitable for automated processes. The material cost is much lower than that of corrosion-resistant metals such as titanium alloy and Hastelloy, and the energy consumption comes only from compressed air, resulting in low operating costs.

[0060] In this application, the second filter 10 can be a high-precision basket filter. High-precision basket filters can efficiently intercept tiny solid impurities in the fluid, protecting the safe operation of downstream precision equipment. Furthermore, the high-precision basket filter uses stainless steel woven mesh or perforated mesh with uniform pore size, and can be customized to different precisions of 5–300 mesh (approximately 50–4000 μm) to meet the demands of harsh operating conditions. The basket structure design allows the effective filtration area to reach 3–4 times the pipe cross-sectional area, ensuring smooth fluid flow and minimal pressure loss (pressure difference only 0.05–0.15 MPa). The quick-opening flange cover design allows the filter basket to be removed for cleaning without disassembling the pipe, significantly reducing downtime.

[0061] Furthermore, the second magnetic separator 11 can be a high-field-strength magnetic rod type pipeline magnetic separator. This type of separator can efficiently remove ferromagnetic impurities from flowing materials in pipelines through an ultra-strong magnetic field. It uses high-performance rare-earth permanent magnet materials such as neodymium iron boron (N45) or samarium cobalt, with a surface magnetic induction intensity reaching 12000–13000 Gauss, far exceeding ordinary magnetic rods (8000–10000 Gs). It has a stronger ability to capture fine iron impurities and is especially suitable for the field of positive electrode materials where the requirements for magnetic materials are stringent. In this application, the high-temperature magnetic rod is preferably made of samarium cobalt, which can stably operate in environments ≤200℃, suitable for high-temperature material conveying scenarios. It has low energy consumption, can maintain magnetic force for a long time relying on permanent magnets, and has zero operating costs. Cleaning only requires removing the magnetic rod for wiping, making operation simple. It can be used alone or in combination to adapt to complex working conditions.

[0062] Thus, the conveying, filtering and iron removal unit 104 can pressurize and output the dissolved glucose solution by the PP pneumatic diaphragm pump 9, first remove undissolved particles and mechanical impurities by a high-precision basket filter, then deeply demagnetize it by a high-field magnetic rod type pipeline iron remover, and finally convey it to the premixing tank 12.

[0063] In some embodiments, the conveying, filtering, and iron removal unit 104 is provided with multiple conveying outlets, which are adapted to be connected one-to-one with multiple premixing tanks 12. That is, the conveying, filtering, and iron removal unit 104 can convey the dissolved material to the multiple premixing tanks 12 respectively. In practical applications, the multiple premixing tanks 12 can correspond to multiple production lines. In this way, the automated sugar dissolving system 100 of the present invention can simultaneously convey materials to multiple production lines, achieving multi-stage purification and precise feeding. The conveying timing and flow rate are controlled in real time by the automatic control unit 105. Figure 1 As shown, there can be three premixing tanks 12, and the three premixing tanks 12 are respectively connected to the conveying outlet of the second iron remover 11 of the conveying, filtering and iron removal unit 104.

[0064] Therefore, the automated sugar-dissolving system 100 of this embodiment of the invention can automatically execute various operations according to a preset process flow controlled by the automatic control unit 105, including automatic addition of pure water, powder weight reduction metering, stirring start-up and timing, heating and temperature adjustment of the heating tape, dissolution and heat preservation, filtration and iron removal conveying, and automatic tank cleaning. During operation, the automatic control unit 105 can collect and store key data such as stirring time, dissolution temperature, material feed rate, pure water flow rate, tank pressure, and equipment status in real time, realizing full traceability of materials throughout the process; at the same time, it can generate trend curves for parameters such as temperature and stirring time, realizing process visualization monitoring, which is convenient for process optimization and quality traceability. The automatic control unit 105 can accurately set and control the stirring time in a closed loop, and automatically adjust and stabilize the dissolution temperature to ensure consistent dissolution effect.

[0065] Furthermore, the automatic control unit 105's program possesses comprehensive error-proofing capabilities. The DCS incorporates multiple interlocks and error-proofing logic, including: prohibiting material feeding if the previous batch has not been thoroughly cleaned; requiring water to be added before powder feeding; prohibiting conveying from starting if metering is incomplete; prohibiting sequence switching if temperature and time do not meet standards; automatic alarm and shutdown for over-temperature and over-flow; blocking the next action if valve status is abnormal; and hierarchical access control for formula parameters. These measures eliminate misoperation at the program level, improving system operational safety and batch stability. The entire system is fully enclosed from material feeding to conveying, operating under slight negative pressure. Dust removal, iron removal, heating, metering, cleaning, and control functions are highly integrated, forming a stable, efficient, and intelligently controllable automated glucose dissolving and conveying process.

[0066] The present invention also proposes a method for carbon coating of phosphorus-based cathode materials, including the step of independently metering and dissolving an organic carbon source and then adding it to other materials for mixing, wherein the independent metering and dissolving of the organic carbon source is carried out using the material addition system for phosphorus-based cathode materials as described in any of the above embodiments.

[0067] In some embodiments, and such as Figure 3 As shown, the independent metering dissolution of organic carbon sources includes the following steps: S1: The automatic control unit 105 controls the feeding unit 101 to operate automatically, and puts the organic carbon source into the feeding unit in a sealed manner. After removing metal foreign objects, the automatic control unit 105 delivers the organic carbon source to the metering unit 102. S2: The metering unit 102 is automatically operated by the automatic control unit 105. The organic carbon source is weighed by the weight reduction metering method, and the metered organic carbon source is quantitatively fed to the dissolution unit 103 by the screw feeder. S3: The automatic control unit 105 controls the dissolving unit 103 to run automatically, adds a set amount of solvent to the dissolving unit 103, and controls the heating element to heat the dissolving tank 8, controls the stirring element to stir, and controls the dust removal element to form a slight negative pressure in the dissolving tank 8 to suppress water vapor from rising, so that the organic carbon source dissolves under heating and stirring conditions to form an organic carbon source solution. In some embodiments, in the S2 metering step, the automatic control unit 105 adopts a weight reduction metering method, calculates the amount of material fed in real time through the weight data changes of the metering unit 102, and controls the screw feeder to stop feeding when the preset target value is reached; And / or, in the S3 dissolution step, the automatic control unit 105 controls the amount of solvent added based on the feedback from the mass flow meter, and reserves a cleaning allowance in each batch of solvent usage for automatic rinsing of the dissolution tank 8 and pipelines after dissolution is completed. And / or, the dissolving unit 103 includes at least two dissolving tanks 8, and the automatic control unit 105 controls the at least two dissolving tanks 8 to operate alternately: when one dissolving tank 8 is dissolving, the other dissolving tank 8 is in a waiting or cleaning state; when one dissolving tank 8 is emptied, the automatic control unit 105 automatically switches to the other dissolving tank 8 to supply material, so as to achieve continuous material supply; And / or, the automatic control unit 105 is a DCS system. The DCS system remotely controls each unit in the central control room and records the stirring time, dissolution temperature, feed amount, pure water flow rate, tank pressure, and equipment status in real time, forming trend curves and material traceability records.

[0068] Therefore, the automatic control unit 105 can realize the automatic metering of the metering unit 102 with weight reduction, the automatic cleaning of the dissolving tank 8, and the automatic continuous feeding of the dissolving tank 8. It can also realize the trend curves of multiple parameter information and material traceability records, which is conducive to forming an overall automated operation and reducing manual intervention.

[0069] In some embodiments, the method for carbon coating of phosphorus-based cathode materials further includes step S4, in which the automatic control unit 105 controls the automatic operation of the conveying, filtering and iron removal unit 104 to pressurize and convey the dissolved organic carbon source solution to the premixing tank. Thus, the automatic control unit 105 is automatically connected to the feeding unit 101, the metering unit 102, the dissolving unit 103, and the conveying, filtering and iron removal unit 104, respectively. This enables the automatic control unit 105 to control the automatic operation of each unit, so that each process step can be automatically realized in an integrated manner, thereby reducing the drawbacks of manual operation and enhancing the reliability, stability and efficiency of the automated sugar dissolving system 100.

[0070] The automatic control unit 105 collects and stores process parameters in real time during steps S1 to S4, and performs interlock control on the execution conditions of each step, automatically executing the next step when the preset conditions are met. Preferably, the preset conditions include at least one of the following: The next batch of materials must not be started before the previous batch has finished cleaning; this prevents the next batch from starting before the previous batch has finished cleaning, ensuring the sequential and accurate execution of each batch.

[0071] Water must be added to the dissolving tank 8 before the metering and feeding can be started; this avoids automatic metering and feeding when the dissolving tank 8 is not filled with water, ensuring the accuracy of the feeding process.

[0072] Conveying must not be started before metering is complete; this avoids automatic conveying before metering is complete, ensuring the accuracy of the conveying process.

[0073] If the dissolution temperature or dissolution time has not reached the preset threshold, the process must not proceed to the conveying step. The system automatically alarms and shuts down when temperature or flow exceeds limits, preventing situations where the system cannot respond in time when temperature or flow exceeds limits.

[0074] When the valve is in an abnormal state, the next action is blocked. That is, in two consecutive actions, if the valve corresponding to the previous action is abnormal, the next action will be automatically opened while the previous action is stopped, ensuring that each action can be completed accurately.

[0075] Therefore, by setting multiple error-proof interlocking logics, it can be ensured that each step or action of the automatic unit can be executed safely, reliably, and accurately during the automated sugar dissolving process, thus ensuring the orderliness of each step or action and enhancing the reliability of the system operation.

[0076] In the S3 dissolution step, the automatic control unit controls the heating element to maintain the dissolution temperature between 40℃ and 60℃, such as 41℃, 42℃, 43℃, 44℃, 46℃, 47℃, 49℃, 50℃, 52℃, 53℃, 55℃, 56℃, 57℃, 58℃, and 59℃, and controls the stirring time to be between 20 and 30 minutes, such as 21 minutes, 22 minutes, 23 minutes, 24 minutes, 25 minutes, 26 minutes, 27 minutes, 28 minutes, and 29 minutes, so that the glucose is completely dissolved.

[0077] Furthermore, in the S4 conveying, filtration, and iron removal step, a basket filter is used as the filter, and a high-field-strength magnetic rod-type pipeline iron remover is used, with a magnetic field strength of 12,000 to 14,000 Gauss, to remove tiny ferromagnetic impurities in the solution.

[0078] The automated sugar dissolving method of this application is achieved by setting a dust removal device to start when the dissolving tank 8 is filled, so as to form a slight negative pressure inside the tank and suppress water vapor from rising; the heating device is started during the dissolving process, which can improve the dissolving rate; the automatic control unit controls the amount of pure water added according to the feedback of the mass flow meter, and reserves a cleaning margin for each batch for automatic flushing of the dissolving tank and pipelines, which can reduce batch errors caused by material sticking to the wall.

[0079] In summary, the phosphorus-based cathode material addition system of the present invention, employing the above-described method for carbon coating of phosphorus-based cathode materials, has the following technical advantages: 1. This system automates the entire glucose process from feeding, metering, dissolving to conveying and cleaning, replacing manual unpacking, weighing, and feeding, significantly reducing labor intensity and improving production efficiency and intelligence. 2. This application employs weight-reducing metering and precise control with a mass flow meter, combined with micro-negative pressure dust removal and automatic wall cleaning, achieving precise and controllable feeding weight, significantly improving batch consistency and batch accuracy. 3. A heating cable is installed in the dissolving tank to accelerate dissolution, solving the problems of powder agglomeration and slow dissolution, ensuring a uniform and stable solution. 4. The overall system of this application, through closed feeding, micro-negative pressure dust removal, and secondary dust removal, effectively suppresses dust and moisture leakage, improves the working environment, and reduces material loss. 5. This application incorporates multi-stage purification with a rotary iron separator, a high-field-strength pipeline iron separator, and a high-precision filter, reducing dust and moisture content. 6. This application features dual dissolution tanks (8) used alternately, allowing simultaneous supply to multiple production lines. The system is continuous and stable, adapting to the needs of large-scale intelligent manufacturing. 7. This application's DCS provides full remote automated control, enabling operation of the entire process from the central control room, reducing on-site personnel intervention and improving production safety and controllability. 8. This application enables full-process material traceability and data visualization. Key parameters such as stirring time and dissolution temperature are recorded in real time and trend curves are generated, facilitating quality traceability, process optimization, and anomaly analysis. 9. The automatic control unit 105 of this application has error-proof interlocking functions, avoiding problems such as incorrect feeding sequence, unwashed feeding, parameter exceeding limits, and misoperation from the control logic, significantly reducing the risk of batch scrap and improving system reliability.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A material addition system for phosphorus-based cathode materials, comprising an automated sugar dissolving system (100), characterized in that, The automated sugar-dissolving system (100) is used to independently add organic carbon sources, including: The feeding unit (101), metering unit (102), dissolving unit (103), and conveying, filtering and iron removal unit (104) are connected in sequence. The feeding unit (101), metering unit (102), dissolving unit (103), and conveying, filtering and iron removal unit (104) are connected in sequence. The dissolving unit includes at least one dissolving tank (8), which is equipped with a heating element and a dust removal element. The automatic control unit (105) is electrically connected to the feeding unit (101), metering unit (102), dissolving unit (103), and conveying, filtering and iron removal unit (104). The automatic control unit (105) is used to control the feeding unit (101) to run automatically and feed to the metering unit (102), control the metering unit (102) to run automatically and feed to the dissolving unit (103), control the heating element to heat the dissolving tank (8) to promote glucose dissolution, control the dust removal element to form a slight negative pressure when feeding to the dissolving tank (8) to suppress water vapor backflow, and control the conveying, filtering and iron removal unit (104) to run automatically and convey to the premixing tank (12).

2. The material addition system for phosphorus-based cathode materials according to claim 1, characterized in that, The feeding unit (101) includes a ton bag feeding station (1), a temporary storage bin (3), and a first iron separator (5). The ton bag feeding station (1), the temporary storage bin (3), and the first iron separator (5) are connected in sequence and electrically connected to the automatic control unit (105). The automatic control unit (105) is used to control the ton bag feeding station (1) to feed materials into the temporary storage bin (3), control the temporary storage bin (3) to selectively feed materials into the first iron separator (5), and control the first iron separator (5) to remove metal foreign objects from the materials and then feed them into the inlet of the metering unit (102).

3. The material addition system for phosphorus-based cathode materials according to claim 2, characterized in that, The feeding unit (101) further includes a first dust collector (2), which is installed in the temporary storage bin (3) and is electrically connected to the automatic control unit (105). The automatic control unit (105) is used to control the first dust collector (2) to remove dust from the temporary storage bin (3). And / or, the feeding unit (101) further includes a rotary valve (4), which is installed between the temporary storage bin (3) and the first iron separator (5). The rotary valve (4) is electrically connected to the automatic control unit (105), which is used to control the rotary valve (4) to feed material evenly from the temporary storage bin (3) to the first iron separator (5).

4. The material addition system for phosphorus-based cathode materials according to claim 2, characterized in that, The ton bag feeding station (1) is equipped with a feeding port, which is used for sealing and feeding glucose after unpacking the ton bag; The automatic control unit (105) is also configured to be electrically connected to the overhead crane, and the automatic control unit (105) is used to control the overhead crane to lift the ton bag of glucose to the feeding port.

5. The material addition system for phosphorus-based cathode materials according to claim 1, characterized in that, The metering unit (102) includes a metering bin (6) and a screw feeder (7). The metering bin (6) and the screw feeder (7) are connected sequentially between the feeding unit (101) and the dissolving unit (103). The metering bin (6) and the screw feeder (7) are electrically connected to the automatic control unit (105). The automatic control unit (105) is used to control the metering bin (6) to automatically meter and control the screw feeder (7) to automatically feed material from the metering bin (6) to the dissolving unit (103).

6. The material addition system for phosphorus-based cathode materials according to claim 5, characterized in that, The dissolving unit (103) includes at least two dissolving tanks (8), the screw feeder (7) is provided with at least two discharge ports, and the at least two dissolving tanks (8) are respectively connected one-to-one between the at least two discharge ports and the inlet of the conveying, filtering and iron removal unit (104); And / or, the metering chamber (6) is connected below the outlet of the feeding unit (101); The screw feeder (7) is connected below the outlet of the metering chamber (6) and above the inlet of the dissolving unit (103).

7. The material addition system for phosphorus-based cathode materials according to claim 6, characterized in that, Each of the dissolving tanks (8) is also provided with a mass flow meter, a first filter and a stirring element. The mass flow meter, the first filter, the dust removal element, the stirring element and the heating element are electrically connected to the automatic control unit (105). The automatic control unit (105) is used to control the mass flow meter, the first filter, the dust removal element, the stirring element and the heating element to operate automatically.

8. The material addition system for phosphorus-based cathode materials according to claim 1, characterized in that, The conveying, filtering and iron removal unit (104) includes a pneumatic diaphragm pump (9), a second filter (10), and a second iron remover (11). The pneumatic diaphragm pump (9), the second filter (10), and the second iron remover (11) are electrically connected to the automatic control unit (105). The automatic control unit (105) is used to control the pneumatic diaphragm pump (9), the second filter (10), and the second iron remover (11) to operate automatically. And / or, the conveying, filtering and iron removal unit (104) is provided with a plurality of conveying outlets, the plurality of conveying outlets being adapted to be connected one-to-one with the plurality of premixing tanks (12).

9. A method for carbon coating of phosphorus-based cathode materials, characterized in that, The method includes the step of independently metering and dissolving an organic carbon source and then adding it to other materials for mixing, wherein the independent metering and dissolving of the organic carbon source is carried out using the material addition system for phosphorus-based cathode materials as described in any one of claims 1-8.

10. The method for carbon coating of phosphorus-based cathode materials according to claim 9, characterized in that, The independent metering dissolution of the organic carbon source includes the following steps: S1: The organic carbon source is sealed and put into the feeding unit (101), and the organic carbon source is transported to the metering unit (102) through the automatic control unit (105). S2: Control the metering unit (102) to weigh the organic carbon source and quantitatively feed it into the dissolving unit (103). S3: Add a set amount of solvent to the dissolving unit (103) while controlling the operation of the heating element and the dust removal element to dissolve and form an organic carbon source solution.

11. The method for carbon coating of phosphorus-based cathode materials according to claim 10, characterized in that, In the S2 metering step, a weight reduction metering method is adopted. The amount of material fed is calculated in real time by the weight data change of the metering unit (102), and the screw feeder is controlled to stop feeding when the preset target value is reached. And / or, in the S3 dissolution step, the amount of solvent added is controlled according to the feedback of the mass flow meter, and a cleaning allowance is reserved in each batch of solvent usage for automatic rinsing of the dissolution tank (8) and pipeline after dissolution is completed. And / or, the dissolving unit (103) includes at least two dissolving tanks (8), and controls at least two dissolving tanks (8) to operate alternately: when one dissolving tank is dissolving, the other dissolving tank is in a waiting or cleaning state; when one dissolving tank is emptied, it automatically switches to the other dissolving tank for feeding, so as to achieve continuous feeding; And / or, the automatic control unit (105) is a DCS system, which remotely controls each unit in the central control room and records the stirring time, dissolution temperature, feed amount, pure water flow rate, tank pressure, and equipment status in real time, forming trend curves and material traceability records.

12. The method for carbon coating of phosphorus-based cathode materials according to claim 10, characterized in that, It also includes step S4, which controls the conveying, filtering and iron removal unit (104) to pressurize and convey the organic carbon source solution to the premixing tank; wherein, the automatic control unit (105) collects and stores process parameters in real time in steps S1 to S4, and performs interlock control on the execution conditions of each step, and automatically executes the next step when the preset conditions are met; Preferably, the preset conditions include at least one of the following: The next batch of materials must not be fed in while the previous batch has not been completely cleaned. Water must be added to the dissolving tank (8) before metering can be started; Conveying must not be started before metering is completed; If the dissolution temperature or dissolution time has not reached the preset threshold, the process must not proceed to the conveying step. The system will automatically alarm and shut down when temperature or flow exceeds the limit. If the valve is in an abnormal state, the next action will be blocked.

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