Raw material dispersing tank for preparing lithium iron phosphate

Abstract

The utility model belongs to the technical field of lithium battery material preparation, particularly relates to a dispersing tank for preparing lithium iron phosphate raw materials, and provides the following scheme aiming at the problems that the stirring mode of the existing device is insufficient in shearing strength and cannot adapt to the rheological property change of slurry with different viscosities, the dispersing tank comprises a tank body, and a rotating rod is rotationally connected in the tank body; a rotating rod is arranged in the tank body, and a rod body of the rotating rod is fixedly connected with a turbine dispersion assembly, a spiral flow guide assembly and a wall scraping assembly from top to bottom. The turbine dispersion assembly, the spiral flow guide assembly and the wall scraping assembly can be driven to synchronously rotate through the rotation of the rotating rod after a lithium iron phosphate liquid raw material is poured into the tank body; and the turbine dispersion assembly shears large particles at a high speed, the spiral flow guide assembly pushes the lithium iron phosphate raw material to circulate up and down, and the wall scraping assembly is matched to scrape and sweep sediments on the tank wall, so that multi-dimensional synergistic dispersion of the lithium iron phosphate raw material is realized.

Description

Technical Field

[0001] This utility model relates to a dispersion tank, specifically a dispersion tank for preparing lithium iron phosphate raw materials, and belongs to the field of lithium battery material preparation technology. Background Technology

[0002] Lithium iron phosphate (LFP), as a cathode material for lithium-ion batteries, is widely used in electric vehicles, energy storage systems, and other fields due to its high safety, long cycle life, and low cost. Its preparation process typically includes four core steps: precursor synthesis, carbon coating, high-temperature sintering, and slurry dispersion. The quality of slurry dispersion directly affects the conductivity, specific capacity, and cycle stability of the electrode material. The slurry dispersion process requires the uniform mixing of nano-sized LFP particles, conductive agents, binders, and solvents to form a non-Newtonian fluid with a solid content as high as 60%-70%. This system has high viscosity, leading to a surge in torque in traditional stirring equipment; van der Waals forces make the particles prone to forming micron-sized aggregates; and it is also temperature sensitive: the solvent NMP has a boiling point of 202℃, but temperatures above 80℃ will cause PVDF molecular chain breakage, requiring precise temperature control within 50±5℃.

[0003] In existing technologies, such as the high-speed dispersion and stirring device for lithium iron phosphate disclosed in CN219502467U, the device can simultaneously stir from both top and bottom directions through a set of stirring tank body, bottom motor, rotating shaft, bushing, semi-ring handle, stirring rod, top motor, main shaft, mounting half-pipe, connecting block, cross rod, mounting hole, fixing rod, nut, and shaft hole. The three sets of stirring structures cross-mix and stir, resulting in more thorough and uniform stirring, and less likelihood of sedimentation or wall adhesion, thus further meeting people's needs and bringing convenience to their work. However, in actual use, the shear strength of the stirring method is insufficient, and it cannot effectively deagglomerate nano-agglomerates; it cannot adapt to the rheological characteristics of slurries with different viscosities, and the dispersion method used is a single stirring dispersion, which cannot achieve multi-dimensional synergistic dispersion of lithium iron phosphate raw materials; relying on a single stirring mode, it is not suitable for processing lithium iron phosphate raw materials with high solid content and high viscosity. Summary of the Invention

[0004] This invention provides a dispersion tank for preparing lithium iron phosphate raw materials to solve the problems of insufficient shear strength and inability to adapt to changes in the rheological properties of slurries with different viscosities in existing stirring methods.

[0005] The present invention achieves the above objectives through the following technical solution: a dispersion tank for preparing lithium iron phosphate raw materials, comprising a tank body, a rotating rod rotatably connected inside the tank body, and a turbine dispersion assembly, a spiral guide assembly and a wall scraping assembly fixedly connected from top to bottom to the shaft of the rotating rod;

[0006] The turbine dispersion assembly includes several turbine blades, which are connected in a ring shape. The turbine blades are arranged in a stepped inclined shape, and the front surface of the turbine blades is a concave arc surface, while the back surface of the turbine blades is a convex arc surface.

[0007] The spiral guide assembly includes spiral blades, and the wall scraping assembly includes a wall scraping frame, with several wall-adhering scraping strips connected to the outer frame edge of the wall scraping frame.

[0008] As a further embodiment of this utility model: a dispersing motor is fixedly connected to the middle part of the top of the tank. The rotating shaft of the dispersing motor is fixedly connected to the rotating rod on the same axis. The dispersing motor is electrically connected to an external power supply. A feed inlet is also provided at the top of the tank, and the feed inlet is located on one side of the dispersing motor.

[0009] As a further improvement of this utility model: a discharge pipe is connected to the center of the bottom end of the tank, and a solenoid valve is installed on the body of the discharge pipe; and a support foot that is set at an incline is connected to the bottom edge of the tank.

[0010] As a further embodiment of this utility model: a number of vertically arranged baffles are fixedly connected to the inner wall of the middle tank body. The baffles are evenly distributed in a ring shape. A number of inclined baffles are connected to the body of the baffles. An ultrasonic transducer distributed in a cross shape is also fixedly connected to the inner wall of the tank body, and the ultrasonic transducer is installed below the baffle.

[0011] As a further improvement of this utility model: the outer wall of the tank is fitted with a plurality of temperature control rings arranged sequentially from top to bottom. Each temperature control ring has a cavity for filling with heat-conducting liquid. The bottom end of each temperature control ring is connected to a liquid inlet, and the top end of each temperature control ring is connected to a liquid outlet. The temperature of the heat-conducting liquid filled in the temperature control ring located in the middle part is greater than the temperature of the heat-conducting liquid filled in the temperature control rings located at both ends.

[0012] As a further improvement of this utility model, the outer edge of the turbine blade is provided with a cutting edge, and the thickness of the cutting edge gradually increases along the direction from the leading edge to the trailing edge of the blade.

[0013] As a further improvement of this invention, a spiral guide strip is connected to the upper surface of the spiral blade.

[0014] As a further improvement of this utility model: a reinforcing connecting rod is connected between the upper end of the wall scraping frame and the body of the rotating rod, and the wall scraping strips are distributed in a staggered manner on both sides of the wall scraping frame.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model is equipped with a tank body, and a rotating rod is rotatably connected inside the tank body. The rod body is fixedly connected from top to bottom to a turbine dispersion component, a spiral guide component, and a wall scraping component. After the liquid lithium iron phosphate raw material is poured into the tank body, the rotation of the rotating rod can drive the turbine dispersion component, the spiral guide component, and the wall scraping component to rotate synchronously, thereby enabling compound stirring of the lithium iron phosphate raw material. The turbine dispersion component shears large particles at high speed, the spiral guide component promotes the lithium iron phosphate raw material to circulate up and down, and works in conjunction with the wall scraping component to scrape the deposits on the tank wall, thereby achieving multi-dimensional synergistic dispersion of the lithium iron phosphate raw material.

[0017] 2. The turbine dispersion component of this utility model includes several turbine blades, which are connected in a ring shape. The turbine blades are arranged in a stepped inclined shape, and the front surface of the turbine blades is a concave arc surface, while the back surface is a convex arc surface. When the turbine blades rotate, they achieve high-speed shearing of lithium iron phosphate raw materials. By utilizing the difference in the tilt angle, alternating shearing zones and axial flow guiding zones are formed, breaking the traditional symmetrical flow field structure and reducing laminar dead zones. The concave front surface and convex back surface of the turbine blades can form an airfoil-like structure. The concave surface accelerates the fluid, while the convex surface generates a reverse pressure gradient, prolonging the fluid contact time and increasing the duration of shearing action, thereby improving the shearing effect.

[0018] The spiral guide assembly includes spiral blades, and the wall scraping assembly includes a wall scraping frame. Several wall-adhering scraping strips are connected to the outer frame of the wall scraping frame. The spiral blades are located in the middle of the tank, and the wall scraping frame is located at the bottom and side wall of the tank. Together with the wall-adhering scraping strips, they scrape the tank wall. The axial circulation and dynamic scraping mechanism formed by the two work together breaks through the limitations of traditional dispersion tanks that rely on a single stirring mode. It is especially suitable for processing lithium iron phosphate raw materials with high solid content and high viscosity, and realizes all-round efficient dispersion and residue cleaning of high solid content lithium iron phosphate raw materials. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall appearance and structure of the present utility model;

[0020] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the tank body and temperature control ring of this utility model;

[0022] Figure 4 This is a schematic diagram of the connection structure between the baffle and the tank body of this utility model;

[0023] Figure 5 This is a partial structural diagram of the spoiler of this utility model;

[0024] Figure 6This is a schematic diagram of the turbine dispersion assembly structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the spiral flow guide component of this utility model;

[0026] Figure 8 This is a schematic diagram of the wall scraping component of this utility model.

[0027] In the diagram: 1. Tank body; 11. Inlet; 12. Outlet pipe; 13. Dispersing motor; 14. Support foot; 15. Solenoid valve; 16. Baffle plate; 17. Baffle plate; 18. Ultrasonic transducer; 2. Temperature control ring; 21. Liquid inlet; 22. Liquid outlet; 3. Rotating rod; 4. Turbine fan blade; 41. Edge blade; 42. Concave arc surface; 43. Convex arc surface; 5. Spiral blade; 51. Spiral guide strip; 6. Scraper frame; 61. Reinforcing connecting rod; 62. Wall scraper. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1

[0030] like Figures 1 to 8 As shown, a dispersion tank for preparing lithium iron phosphate raw materials includes a tank body 1. A rotating rod 3 is rotatably connected inside the tank body 1. The rod body 3 is fixedly connected from top to bottom to a turbine dispersion component, a spiral guide component, and a wall scraping component. After the liquid lithium iron phosphate raw material is poured into the tank body 1, the rotation of the rotating rod 3 can drive the turbine dispersion component, the spiral guide component, and the wall scraping component to rotate synchronously, thereby enabling composite stirring of the lithium iron phosphate raw material. The turbine dispersion component shears large particles at high speed, the spiral guide component promotes the lithium iron phosphate raw material to circulate up and down, and the wall scraping component scrapes the deposits on the tank wall to achieve multi-dimensional synergistic dispersion of the lithium iron phosphate raw material.

[0031] The turbine dispersion assembly includes several turbine blades 4, which are connected in a ring shape. The turbine blades 4 are arranged in a stepped inclined shape, with the frontal surface of the turbine blades 4 being an inwardly concave arc surface 42 and the backal surface being an outwardly convex arc surface 43. When the turbine blades 4 rotate, they achieve high-speed shearing of lithium iron phosphate raw materials and utilize the difference in tilt angle to form alternating shearing zones and axial flow guiding zones, breaking the traditional symmetrical flow field structure and reducing laminar dead zones. The inwardly concave frontal surface and the outwardly convex backal surface of the turbine blades 4 can form an airfoil-like structure. The concave surface accelerates the fluid, while the convex surface generates a reverse pressure gradient, prolonging the fluid contact time and increasing the duration of shearing action, thereby improving the shearing effect.

[0032] The spiral guide assembly includes spiral blades 5, and the wall scraping assembly includes a wall scraping frame 6. Several wall-adhering scraping strips 62 are connected to the outer frame of the wall scraping frame 6. The spiral blades 5 are located in the middle of the tank body 1, and the wall scraping frame 6 is located at the bottom and side wall of the tank body 1. Together with the wall-adhering scraping strips 62, they scrape the tank wall. The axial circulation and dynamic scraping mechanism formed by the two work together breaks through the limitations of traditional dispersion tanks that rely on a single stirring mode. It is especially suitable for processing lithium iron phosphate raw materials with high solid content and high viscosity, and realizes all-round efficient dispersion and residue cleaning of high solid content lithium iron phosphate raw materials.

[0033] Example 2

[0034] Improvements based on Example 1:

[0035] like Figures 1 to 5 As shown, a dispersing motor 13 is fixedly connected to the middle part of the top of the tank 1. The rotating shaft of the dispersing motor 13 is fixedly connected to the rotating rod 3 along the same axis. The dispersing motor 13 is electrically connected to an external power supply. The top of the tank 1 is also provided with a feed inlet 11, which is located on one side of the dispersing motor 13. The lithium iron phosphate raw material can be easily added to the tank 1 through the feed inlet 11. The dispersing motor 13 provides driving force to drive the rotating rod 3 to rotate, thereby driving the turbine dispersing assembly, the spiral guide assembly and the wall scraping assembly to rotate synchronously inside the tank, so as to realize the dispersion treatment of the lithium iron phosphate raw material.

[0036] Furthermore, a discharge pipe 12 is connected to the center of the bottom of the tank 1, and a solenoid valve 15 is installed on the body of the discharge pipe 12. An inclined support foot 14 is connected to the bottom edge of the tank 1. The support foot 14 can form a stable support for the tank 1 and make the bottom of the tank 1 suspended. This allows the solenoid valve 15 to be opened so that the dispersed lithium iron phosphate raw material can be discharged through the discharge pipe 12, thereby realizing the collection of the dispersed lithium iron phosphate raw material.

[0037] Furthermore, several vertically arranged baffles 16 are fixedly connected to the inner wall of the middle tank body 1. The baffles 16 are evenly distributed in a ring shape. Several inclined baffles 17 are connected to the body of the baffles 16. Ultrasonic transducers 18 distributed in a cross shape are also fixedly connected to the inner wall of the tank body 1. The ultrasonic transducers 18 are installed below the baffles 16. When the spiral blades 5 drive the lithium iron phosphate raw material to circulate axially, the baffles 16 have a vertical shearing effect on the lithium iron phosphate raw material. While crushing the raw material particles, they can also suppress particle sedimentation. Combined with the effect of the baffles 17, the shearing effect on the lithium iron phosphate raw material can be further improved. At the same time, the ultrasonic transducers 18 can form an ultrasonic cavitation effect, which can further de-agglomerate the lithium iron phosphate raw material.

[0038] Furthermore, the outer wall of the tank 1 is solidly fitted with multiple temperature control rings 2 arranged sequentially from top to bottom. Each temperature control ring 2 has a cavity filled with heat-conducting liquid. The bottom end of each temperature control ring 2 is connected to a liquid inlet 21, and the top end of each temperature control ring 2 is connected to a liquid outlet 22. The temperature of the heat-conducting liquid filled in the temperature control ring 2 located in the middle part is higher than the temperature of the heat-conducting liquid filled in the temperature control rings 2 located at both ends, so as to realize gradient zone temperature control of the interior of the tank 1, solving the problems of large temperature gradient, concentrated thermal stress, and high energy consumption of traditional integral jackets. It should be noted that the heat-conducting liquid filled in the temperature control rings 2 includes, but is not limited to, heat-conducting oil. The temperature of the heat-conducting oil in the upper temperature control ring 2 is 45°C to prevent solvent evaporation; the temperature of the heat-conducting oil in the middle temperature control ring 2 is 60°C to promote complete chemical reaction; and the temperature of the heat-conducting oil in the lower temperature control ring 2 is 30°C to avoid high-temperature coking of materials.

[0039] like Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, the outer edge of the turbine blade 4 is provided with a cutting edge 41, and the thickness of the cutting edge 41 gradually increases along the direction from the leading edge to the trailing edge of the blade. The cutting edge 41 forms a cutting edge at the leading edge to ensure initial shearing efficiency; the cutting edge 41 forms a thickened cutting tail at the trailing edge to improve structural strength and prevent high-frequency vibration fracture.

[0040] Furthermore, a spiral guide strip 51 is connected to the upper surface of the spiral blade 5 to improve the guiding effect, so that the lithium iron phosphate raw material can have a better axial circulation effect under the rotation force of the spiral blade 5.

[0041] Furthermore, a reinforcing connecting rod 61 connects the upper end of the scraping frame 6 to the body of the rotating rod 3. The wall-adhering scraping strips 62 are staggered on both sides of the scraping frame 6. The reinforcing connecting rod 61 makes the connection between the scraping frame 6 and the rotating rod 3 more secure, thus preventing the scraping frame 6 from deforming during rotation. At the same time, when the scraping frame 6 drives the wall-adhering scraping strips 62 to scrape the inner wall of the tank 1, the staggered distribution of the wall-adhering scraping strips 62 avoids multiple wall-adhering scraping strips 62 from contacting the same area at the same time. This ensures that the scraping is clean and also makes the load of the rotating rod 3 stable during rotation.

[0042] Working Principle: After the liquid lithium iron phosphate raw material is poured into tank 1, the rotation of the rotating rod 3 drives the turbine dispersion component, the spiral guide component, and the wall scraping component to rotate synchronously, thereby performing compound stirring of the lithium iron phosphate raw material. The turbine dispersion component shears large particles at high speed, and the turbine fan blades 4 achieve high-speed shearing of the lithium iron phosphate raw material when rotating. The difference in tilt angle forms an alternating shearing zone and an axial flow zone. The concave surface accelerates the fluid, and the convex surface generates a reverse pressure gradient, prolonging the fluid contact time and increasing the duration of the shearing action, thus improving the shearing effect. The spiral guide component propels the lithium iron phosphate raw material to circulate up and down, and works with the wall scraping component to scrape the deposits on the tank wall, achieving multi-dimensional synergistic dispersion of the lithium iron phosphate raw material. The axial circulation and dynamic scraping mechanism formed by the synergy of the two breaks through the limitations of traditional dispersion tanks that rely on a single stirring mode. It is especially suitable for processing lithium iron phosphate raw materials with high solid content and high viscosity, achieving all-round efficient dispersion and residue cleaning of high solid content lithium iron phosphate raw materials.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dispersion tank for preparing lithium iron phosphate raw materials, comprising a tank body (1), characterized in that: The tank (1) is rotatably connected to a rotating rod (3), and the rod body of the rotating rod (3) is fixedly connected from top to bottom to a turbine dispersion assembly, a spiral guide assembly and a wall scraping assembly; The turbine dispersion assembly includes a plurality of turbine blades (4), the connection positions of the plurality of turbine blades (4) are arranged in a ring, the turbine blades (4) are arranged in a stepped inclined manner, and the front surface of the turbine blades (4) is an inwardly concave arc surface (42), and the back surface of the turbine blades (4) is an outwardly convex arc surface (43). The spiral guide assembly includes spiral blades (5), the wall scraping assembly includes a wall scraping frame (6), and the outer frame edge of the wall scraping frame (6) is connected with a plurality of wall-adhering scraping strips (62).

2. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: A dispersing motor (13) is fixedly connected to the middle part of the top of the tank (1). The rotating shaft of the dispersing motor (13) is fixedly connected to the rotating rod (3) on the same axis. The dispersing motor (13) is electrically connected to an external power supply. The top of the tank (1) is also provided with a feed inlet (11), and the feed inlet (11) is located on one side of the dispersing motor (13).

3. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: The bottom center of the tank (1) is connected to a discharge pipe (12), and a solenoid valve (15) is installed on the body of the discharge pipe (12). The bottom edge of the tank (1) is connected to a support foot (14) that is set in an inclined position.

4. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: The inner wall of the middle tank body (1) is fixedly connected with several vertically arranged baffles (16), the baffles (16) are evenly distributed in a ring, and the baffles (16) are connected with several inclined baffles (17). The inner wall of the tank body (1) is also fixedly connected with ultrasonic transducers (18) distributed in a cross shape, and the ultrasonic transducers (18) are installed below the baffles (16).

5. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: The outer wall of the tank (1) is fitted with a plurality of temperature control rings (2) arranged sequentially from top to bottom. Each temperature control ring (2) has a cavity for filling with heat-conducting liquid. The bottom end of each temperature control ring (2) is connected to a liquid inlet (21), and the top end of each temperature control ring (2) is connected to a liquid outlet (22). The temperature of the heat-conducting liquid filled in the temperature control ring (2) located in the middle part is greater than the temperature of the heat-conducting liquid filled in the temperature control rings (2) located at both ends.

6. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: The outer edge of the turbine blade (4) is provided with a cutting edge (41), and the thickness of the cutting edge (41) gradually increases along the direction from the leading edge to the trailing edge of the blade.

7. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: The upper surface of the helical blade (5) is connected to a helical guide strip (51).

8. The dispersion tank for preparing lithium iron phosphate raw materials according to claim 1, characterized in that: A reinforcing connecting rod (61) connects the upper end of the wall scraping frame (6) to the rod body of the rotating rod (3), and the wall-adhering scraping strips (62) are distributed in a staggered manner on both sides of the wall scraping frame (6).

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