CN-121988224-A - Continuous secondary granulation process and system for artificial graphite anode material

CN121988224ACN 121988224 ACN121988224 ACN 121988224ACN-121988224-A

Abstract

The invention relates to the technical field of negative electrode materials of lithium ion batteries, in particular to a continuous secondary granulation process and system of an artificial graphite negative electrode material, comprising a feeding module, a granulator, a double-curvature rolling track module, a differential rotor driving module, a micro-texture lining plate module, a discharging module and a control monitoring module, wherein the feeding module is used for uniformly inputting the artificial graphite negative electrode material into a working cavity of the granulator, the granulator is used for carrying out secondary granulation on the artificial graphite negative electrode material, the double-curvature rolling track module is used for respectively rolling and shearing the material through the double-curvature track, the differential rotor driving module is used for driving the double-curvature track and controlling the rotating speed of the double-curvature track, the micro-texture lining plate module is used for controlling the rolling and sliding of material particles through different surface textures, and the discharging module is used for discharging formed material particles. The continuous secondary granulation design of the scheme avoids the series connection and repeated operation of multiple devices in the traditional technology, and improves the continuity and efficiency of production.

Inventors

GAO BO
YI FENG
Shou Chenxi

Assignees

东莞市和鸿升新材料科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260324

Claims (8)

1. The continuous secondary granulating system for the artificial graphite anode material is characterized by comprising a feeding module, a granulator, a double-curvature rolling track module, a differential rotor driving module, a micro-texture lining plate module, a discharging module and a control monitoring module, wherein the double-curvature rolling track module, the differential rotor driving module and the micro-texture lining plate module are arranged in the granulator; The feeding module is used for uniformly inputting the artificial graphite cathode material into a working cavity of the granulator, the granulator is used for carrying out secondary granulation on the artificial graphite cathode material, the double-curvature rolling track module is used for respectively rolling and shearing the material through double-curvature tracks, the differential rotor driving module is used for driving the double-curvature tracks and controlling the rotating speed of the double-curvature tracks, the micro-texture lining plate module is used for controlling the rolling and sliding of material particles through different surface textures so as to optimize the particle morphology, the discharging module is used for discharging the formed material particles, and the control monitoring module is used for monitoring the operation parameters of each device and automatically regulating and controlling the device.
2. The continuous secondary granulating system of artificial graphite cathode materials according to claim 1, wherein the double-curvature rolling track module comprises a double-curvature track formed by an inner ring and an outer ring, the inner ring is a spherical track, the outer ring is a shallow conical track, the inner ring and the outer ring together enclose an annular granulating cavity, the materials are sheared on the shallow conical surface of the outer ring while rolling in the inner ring, the double-curvature rolling track module is arranged in an outer frame of the granulator through a bearing, and the distance between the inner ring and the outer ring is adjusted through an adjusting element arranged on a differential rotor driving module so as to optimize the movement path and the contact mode of the materials.
3. The continuous secondary granulation system of artificial graphite anode material according to claim 1, wherein said differential rotor driving module comprises a main rotor and a sub rotor, said main rotor and sub rotor being coaxially disposed, said main rotor being for pushing the material to roll along said double curvature track, said sub rotor being for rotating an outer ring of said double curvature track, and a rotational speed of said sub rotor being different from a rotational speed of said main rotor; the differential rotor driving module further comprises a rotating speed adjusting unit, and the rotating speed adjusting unit is used for adjusting the rotating speed difference of the main rotor and the auxiliary rotor according to the control signal generated by the control monitoring module so as to adjust the movement behavior of materials on the track and the particle forming process.
4. The continuous secondary granulation system of artificial graphite anode material according to claim 1, wherein the micro-texture lining plate module comprises a plurality of replaceable lining plates, and the surface of the lining plates is provided with micro-convex points, micro-grooves or honeycomb textures; The lining plate is arranged at the contact part of the double-curvature rolling track module and used for exerting influence on the material particles in the granulating process so as to optimize the particle shape.
5. The continuous secondary granulation system of artificial graphite anode material according to claim 1, wherein the control monitoring module comprises a plurality of sensors, a controller, a control signal generating unit and a display unit, wherein the sensors are used for monitoring key parameters in the operation process of equipment; The control signal generating unit is used for automatically generating a control signal according to real-time data fed back by the sensor and adjusting the rotating speed of the differential rotor driving module and the conveying speed of the feeding and discharging module through the control signal; the display unit is used for displaying the operation state and the equipment performance in real time, so that an operator can adjust parameters in time, and the equipment can be ensured to run under the optimal working condition.
6. The continuous secondary granulation system of artificial graphite anode material according to claim 1, further comprising a pre-mixer, a dryer and a sieving machine, wherein the pre-mixer is arranged between the feeding module and the granulator and is used for primarily mixing raw materials to be sufficiently uniform, the dryer is arranged between the granulator and the sieving machine and is used for drying material particles to remove excessive moisture or solvent, and the sieving machine is arranged between the dryer and the discharging module and is used for sieving the dried material particles to separate qualified particles.
7. The continuous secondary granulation system of artificial graphite anode material according to claim 1, wherein the double curvature rolling track module is arranged outside the granulator and is in direct contact with the material, the double curvature rolling track module further comprises an outer frame, a movable space and a transition surface, the inner ring, the outer ring, the movable space and the outer frame are sequentially arranged on the double curvature rolling track module from inside to outside according to the section direction, the surfaces of the inner ring and the outer ring are in direct contact with the material, the transition surface is arranged on the bottom surface of the outer ring of the inner ring, when the inner ring and the outer ring are bonded, the transition surface is not in contact with the material, and when the distance between the inner ring and the outer ring is not zero, the transition surface is in contact with the material through a gap between the outer ring and the inner ring, thereby playing a role of transition and preventing the material from falling into the granulator; The differential rotor driving module is arranged inside the granulator and isolated from the external environment, the main rotor and the auxiliary rotor are coaxially arranged at the bottom of the inner ring, the differential rotor driving module further comprises an outer ring connecting part and an adjusting element, the outer ring connecting part is connected with the bottom surface of the outer ring and the telescopic part, the adjusting element is arranged on the auxiliary rotor in a telescopic mode, the adjusting element is used for converting the rotation of the auxiliary rotor into the rotation of the outer ring connecting part so as to drive the outer ring to rotate, and meanwhile, the adjusting element is further used for adjusting the length of the adjusting element according to a control signal so as to adjust the distance between the outer ring and the inner ring.
8. A continuous secondary granulation process of an artificial graphite anode material, which is applied to a continuous secondary granulation system of an artificial graphite anode material as claimed in claim 1, characterized in that the process comprises the steps of: s1, inputting materials into a system through a feeding module; S2, adding required additives and materials into a pre-mixer, primarily mixing the materials by the pre-mixer, and conveying the materials into a granulator after the materials are fully and uniformly mixed; S3, adjusting the distance between the outer ring and the inner ring of the double-curvature rolling track module, the rotating speed of the outer ring, the rotating speed of the inner ring and the working time of the double-curvature rolling track module according to preset parameters of primary granulation, so as to realize primary granulation of materials; S4, after cooling for a specified time, adding a required additive into the granulator, and adjusting the distance between the outer ring and the inner ring of the double-curvature rolling track module, the rotating speed of the outer ring, the rotating speed of the inner ring and the working time of the double-curvature rolling track module according to preset parameters of secondary granulation to realize secondary granulation of materials; S5, conveying the obtained material particles into a dryer, drying the material particles, and conveying the material particles to a screening machine; S6, screening the material particles meeting the actual demands by a screening machine, discharging the material particles by a discharging module, and returning the unqualified material particles to a granulator for re-granulation.

Description

Continuous secondary granulation process and system for artificial graphite anode material Technical Field The invention relates to the technical field of lithium ion battery cathode materials, in particular to a continuous secondary granulation process and system of an artificial graphite cathode material. Background Currently, lithium ion battery anode materials for commercial applications mainly include carbon materials (such as natural graphite, artificial graphite, etc.) and non-carbon materials (such as silicon-based materials, tin-based materials, etc.). Wherein, the artificial graphite occupies the dominant position of the market due to the characteristics of good circulation stability, strong compatibility with high-current charge and discharge, high structural stability and the like. In the preparation process of the artificial graphite anode material, the design of a particle structure is critical to the electrochemical performance of the material. In order to achieve both high energy density and high rate performance, a secondary granulation process is commonly adopted in the industry. Secondary granulation refers to mixing primary graphite particles (matrix particles) with a binder (e.g., pitch) and additives, and agglomerating by heat treatment or mechanical forces to form secondary particles of larger particle size. The preparation method comprises the steps of uniformly mixing a cathode raw material and a binder, adding water, stirring to obtain a wet material, performing pelletization treatment on the wet material to obtain a spherical mixture, wherein the binder is formed by compounding a starch binder and an asphalt binder or a resin binder, performing heat treatment on the spherical mixture to obtain dried and hardened pellets, graphitizing, and crushing and screening the graphitized pellets to obtain the secondary particle artificial graphite cathode material. And mixing the binder with the negative electrode raw material powder, performing pelletization and graphitization treatment, bonding partial materials after graphitization, and crushing, scattering and screening the materials to obtain the secondary particle artificial graphite negative electrode product. At present, the existing secondary granulation equipment technology generally needs multiple equipment to be connected in series and operated repeatedly, so that the power consumption is high, the efficiency is low, and the invention is made in order to solve the common problems in the field. Disclosure of Invention The invention aims to provide a continuous secondary granulation process and system for an artificial graphite anode material, aiming at the defects existing at present. In order to overcome the defects in the prior art, the invention adopts the following technical scheme: the continuous secondary granulation system for the artificial graphite anode material comprises a feeding module, a granulator, a double-curvature rolling track module, a differential rotor driving module, a micro-texture lining plate module, a discharging module and a control monitoring module, wherein the double-curvature rolling track module, the differential rotor driving module and the micro-texture lining plate module are arranged in the granulator; The feeding module is used for uniformly inputting the artificial graphite cathode material into a working cavity of the granulator, the granulator is used for carrying out secondary granulation on the artificial graphite cathode material, the double-curvature rolling track module is used for respectively rolling and shearing the material through double-curvature tracks, the differential rotor driving module is used for driving the double-curvature tracks and controlling the rotating speed of the double-curvature tracks, the micro-texture lining plate module is used for controlling the rolling and sliding of material particles through different surface textures so as to optimize the particle morphology, the discharging module is used for discharging the formed material particles, and the control monitoring module is used for monitoring the operation parameters of each device and automatically regulating and controlling the device. Furthermore, the double-curvature rolling track module comprises a double-curvature track formed by an inner ring and an outer ring, wherein the inner ring is a spherical track, the outer ring is a shallow conical track, the inner ring and the outer ring form an annular granulating cavity in a surrounding mode, materials are sheared on the shallow conical surface of the outer ring when rolling in the inner ring, the double-curvature rolling track module is arranged in an outer frame of the granulator through a bearing, and the distance between the inner ring and the outer ring is adjusted through an adjusting element arranged on a differential rotor driving module so as to optimize the movement path and the contact mode of the materials. Further, the differential rotor