Lithium battery material powder liquid phase coating device and liquid phase coating method

Abstract

The invention discloses a lithium battery material powder liquid phase coating device and a liquid phase coating method, and particularly relates to the field of graphite coating, the lithium battery material powder liquid phase coating device comprises a mounting frame, an end cover and a mixing kettle are arranged on the mounting frame, a rotating disc is arranged at the bottom of the inner side of the mixing kettle, and a rotating driving part is arranged at the bottom of the outer side of the mixing kettle; the output end of the rotary driving part is fixedly connected with the middle part of the turntable; the rotary driving part is used for driving the turntable to rotate so as to stir a mixed solution in the mixing kettle; a particle inner spraying assembly is arranged on the mounting frame and comprises a water pump. In the process of stirring the mixed liquid, natural graphite particles quickly move towards the middle of the mixing kettle along with a solution sprayed out of the liquid inlet nozzle, so that the degree of aggregation and mutual extrusion contact of the natural graphite particles is reduced, the solution in the middle of the mixing kettle is utilized, the natural graphite particles are in full contact with the asphalt solution, and the mixing effect is improved. The coating is uniform, and the stirring time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of graphite coating, and more specifically, to a liquid-phase coating device and a liquid-phase coating method for lithium battery material powder. Background Art

[0002] Lithium batteries have the characteristics of high voltage, high specific energy and low self-discharge. They are widely used in various fields and play an irreplaceable role.

[0003] The negative electrode material of lithium batteries is mainly natural graphite. After shaping and grading, although the particle shape of natural graphite is close to spherical, it inevitably retains defects such as holes, grooves, and cracks in the original graphite, so there are problems such as high specific surface area and low initial coulomb efficiency. Usually, coating treatment is required. At present, the mainstream adopts liquid phase coating treatment process, which mainly puts the graphite after shaping and grading treatment and asphalt solution in a mixing device and stirs them to make the asphalt penetrate into the micropores of artificial graphite and evenly coat its surface. The finished product is obtained after subsequent operations such as centrifugal separation.

[0004] The current mixing device is mainly a mixing drum with a stirring device installed inside. When using a stirring blade, the edge of the stirring blade is relatively sharp. When it collides head-on with the graphite particles, the cracks on the surface of the graphite will deepen or the particles will break. Therefore, a turntable (such as a impeller) is generally used for stirring.

[0005] However, during the stirring process, due to the centrifugal effect, the graphite particles will be concentrated on the inner wall area of ​​the stirring drum. The graphite particles are concentrated and squeezed together, which will cause insufficient contact between the graphite particles and the asphalt solution. The stirring time needs to be extended, and the contact time between the graphite particles where they are squeezed and contacted with each other is short, resulting in uneven contact between the graphite particles and the asphalt solution, causing uneven coating. Summary of the invention

[0006] The present invention provides a lithium battery material powder liquid phase coating device and liquid phase coating method, and aims to solve the problem that graphite particles are concentrated and squeezed on the inner wall area of ​​a mixing drum due to centrifugal action, and the mutually squeezed contact positions have less contact time with the asphalt solution, resulting in insufficient contact with the asphalt solution, the stirring time needs to be extended, and the coating is uneven.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lithium battery material powder liquid phase coating device, comprising a mounting frame, an end cover and a mixing kettle are arranged on the mounting frame, a turntable is arranged at the bottom of the inner side of the mixing kettle, a rotating drive component is arranged at the bottom of the outer side of the mixing kettle, the output end of the rotating drive component is fixedly connected to the middle of the turntable, and the rotating drive component is used to drive the turntable to rotate so as to stir the mixed solution in the mixing kettle; an intra-particle spraying assembly is arranged on the mounting frame, and the intra-particle spraying assembly includes a water pump, a plurality of liquid inlet nozzles are fixedly installed on the outer wall of the mixing kettle, and the plurality of liquid inlet nozzles are arranged at different heights, the water inlet end of the water pump is connected to the interior of the mixing kettle, and the water outlet end of the water pump is connected to a liquid collector, and the liquid collectors are all connected to the plurality of liquid inlet nozzles, the water pump draws out the liquid in the mixing kettle and then sprays it into the interior of the mixing kettle from the liquid inlet nozzle, and the liquid sprayed into the interior of the mixing kettle carries the lithium battery negative electrode powder particles gathered on the inner wall of the mixing kettle to move to the middle of the mixing kettle.

[0008] In a preferred embodiment, a convex disc is provided in the middle of the upper surface of the rotating disc, and a plurality of external stirring ridges are evenly arranged in the circumferential direction of the convex disc.

[0009] In a preferred embodiment, the particle spraying assembly also includes a central tube, which is inserted in the middle of the end cover. When the end cover is covered on the mixing kettle to close the mixing kettle, there is a gap between the central tube and the convex disc, and the water inlet end of the water pump is connected to the upper end of the central tube.

[0010] In a preferred embodiment, the bottom of the central tube has a conical portion, the opening diameter of the lower end of the conical portion is larger than the opening diameter of the upper end, and a plurality of inner stirring ridges are arranged in the circumferential direction of the upper surface of the convex disk, and the inner stirring ridges are located directly below the conical portion.

[0011] In a preferred embodiment, a vertical drive assembly is provided on the upper surface of the end cover, and the vertical drive assembly includes a linear drive component 1 fixedly mounted on the upper surface of the end cover, a guide plate is fixedly mounted on the output end of the linear drive component 1, an inclined groove is provided on the side of the guide plate, and a roller is rotatably connected to the side wall of the upper end of the central tube, and the roller rolls inside the inclined groove.

[0012] In a preferred embodiment, a rotating ring is rotatably provided on the upper surface of the convex disc, and the rotating ring is located directly below the lower end edge of the conical portion.

[0013] In a preferred embodiment, an opening and closing assembly is also provided on the mounting frame, and the opening and closing assembly includes a fixed column vertically fixedly mounted on the mounting frame, a connecting frame is sleeved on the fixed column, the mixing kettle is fixedly mounted on the connecting frame, the end cover is fixedly mounted on the mounting frame, a connecting arm is rotatably connected to the connecting frame, the rotation axis of the connecting arm coincides with the axis of the fixed column, a linear drive component 2 is fixedly mounted on the mounting frame, and the output end of the linear drive component 2 is fixedly connected to the connecting arm.

[0014] In a preferred embodiment, a reversing valve is installed at the upper end of the central tube, and the reversing valve has through port one, through port two and through port three. The water inlet end of the water pump is connected with through port two through the liquid suction pipe, and the upper end of the central tube is connected with through port one. The reversing valve is used to control the connection between through port one and through port two or through port three.

[0015] In a preferred embodiment, the inner side wall of the bottom of the mixing kettle is a conical surface that is larger at the top and smaller at the bottom, and the height of the conical surface is lower than the liquid inlet nozzle located at the bottom.

[0016] The present invention also provides a method for liquid-phase coating of lithium battery material powder, using the above-mentioned lithium battery material powder liquid-phase coating device, comprising the following steps: Step 1: Add lithium battery negative electrode powder particles into the mixing kettle, cover the end cover on the mixing kettle, and fill the asphalt solution from the central tube into the mixing kettle; Step 2: Use a rotating drive component to drive the turntable to rotate, and gradually increase the speed to 200-250r / min, so that the lithium battery negative electrode powder particles are gathered on the inner wall area of ​​the mixing kettle; Step 3: Use a water pump to extract the liquid in the mixing kettle from the central tube and re-inject it into the mixing kettle from the liquid inlet nozzle, so that the lithium battery negative electrode powder particles gathered in the inner wall area of ​​the mixing kettle move to the middle of the mixing kettle, and continue for 20-30 minutes; Step 4: The water pump and the rotating drive components are stopped in sequence, and the discharge port on the mixing kettle is opened to discharge the liquid in the mixing kettle from the discharge port.

[0017] The technical effects and advantages of the present invention are as follows: Through the arrangement of the particle inner spray assembly, during the stirring process of the mixed liquid, the water pump draws out the liquid in the mixing kettle and then sprays it into the interior of the mixing kettle from the liquid inlet nozzle, so that the natural graphite particles move rapidly toward the middle of the mixing kettle along with the solution sprayed from the liquid inlet nozzle, thereby some of the natural graphite particles gathered on the inner wall of the mixing kettle move to the middle of the mixing kettle, thereby reducing the aggregation of the natural graphite particles and the degree of mutual extrusion contact, and also making use of the solution in the middle of the mixing kettle, so that the natural graphite particles are in full contact with the asphalt solution, are evenly coated, and the stirring time is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 .

[0019] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 .

[0020] Figure 3 It is a schematic diagram of the local structure of the present invention Figure 1 .

[0021] Figure 4 For the present invention Figure 3 sectional view of .

[0022] Figure 5 It is a schematic diagram of the installation of the turntable and the rotating drive component of the present invention.

[0023] Figure 6 Schematic diagram of the intragranular spraying assembly arrangement of the present invention.

[0024] Figure 7 For the present invention Figure 3 Schematic diagram of the local structure.

[0025] Figure 8 This is a schematic diagram of the installation of the opening and closing component of the present invention.

[0026] Fig. 9 This is a step diagram of the liquid phase coating method of the present invention.

[0027] The accompanying drawings are marked as follows: 1. mounting frame; 10. controller; 2. end cover; 20. feed port; 3. mixing kettle; 30. push handle; 31. conical surface; 4. turntable; 41. external stirring ridge; 42. convex plate; 43. internal stirring ridge; 44. swivel; 5. particle internal spray assembly; 51. water pump; 52. liquid inlet nozzle; 53. center tube; 531. conical portion; 54. liquid collector; 55. liquid delivery pipe; 56. liquid extraction pipe; 57. reversing valve; 571. through port one; 572. through port two; 573. through port three; 6. vertical drive assembly; 61. linear drive component one; 62. guide plate; 63. inclined slot; 64. roller; 7. opening and closing assembly; 71. fixing column; 72. connecting frame; 73. connecting arm; 74. linear drive component two; 8. rotary drive component. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Refer to the instruction manual Figure 1-Figure 9A lithium battery material powder liquid phase coating device comprises a mounting frame 1, an end cap 2 and a mixing kettle 3 are arranged on the mounting frame 1, a turntable 4 is arranged at the bottom of the inner side of the mixing kettle 3, a rotating driving component 8 is arranged at the bottom of the outer side of the mixing kettle 3, an output end of the rotating driving component 8 is fixedly connected to the middle of the turntable 4, and the rotating driving component 8 is used to drive the turntable 4 to rotate so as to stir the mixed solution in the mixing kettle 3; an intra-particle spraying component 5 is arranged on the mounting frame 1, and the intra-particle spraying component 5 includes a water pump 51, and the mixing kettle 3 is fixedly mounted with a plurality of liquid inlet nozzles 52, which are arranged at different heights. The water inlet end of the water pump 51 is connected to the interior of the mixing kettle 3, and the water outlet end of the water pump 51 is connected to a liquid collector 54, which are all connected to the plurality of liquid inlet nozzles 52. The water pump 51 extracts the liquid in the mixing kettle 3 and then injects it into the mixing kettle 3 from the liquid inlet nozzles 52. The liquid injected into the mixing kettle 3 carries the lithium battery negative electrode powder particles gathered on the inner wall of the mixing kettle 3 to move to the middle of the mixing kettle 3.

[0030] In the above technical solution, a convex disc 42 is arranged in the middle of the upper surface of the rotating disc 4 , and a plurality of outer stirring ridges 41 are evenly arranged in the circumferential direction of the convex disc 42 .

[0031] It should be noted that the rotating driving component 8 is a motor, which drives the turntable 4 to rotate, and the convex disc 42 can stir the mixed solution in the mixing kettle 3.

[0032] In this embodiment, the lithium battery material powder is a lithium battery negative electrode material, specifically natural graphite. Natural graphite particles and asphalt solution are added to the interior of the mixing kettle 3 and stirred, so that the asphalt penetrates into the micropores of the artificial graphite and is evenly coated on its surface, thereby realizing liquid phase coating. Specifically, during stirring, the rotating drive component 8 drives the turntable 4 to rotate to realize the stirring function. During the stirring process, due to the centrifugal effect, the natural graphite particles gather at the inner side wall of the mixing kettle 3, causing extrusion and contact between the natural graphite particles, uneven contact with the asphalt solution, and the asphalt solution in the middle of the mixing kettle 3 is not utilized, which reduces the coating efficiency and coating uniformity. More specifically, during the stirring process, the mixed solution in the mixing kettle 3 is sucked out by using the particle spray assembly 5, and is sprayed out from several liquid inlet nozzles 52 after passing through the liquid collector 54 and several pipes. During the stirring process, the natural graphite particles continue to rotate along the inner wall of the mixing kettle 3 with the solution. When passing the position of the liquid inlet nozzle 52, the natural graphite particles will move rapidly toward the middle of the mixing kettle 3 with the solution sprayed from the liquid inlet nozzle 52, thereby causing some natural graphite particles gathered on the inner wall of the mixing kettle 3 to move to the middle of the mixing kettle 3. Although they will still move toward the inner wall of the mixing kettle 3 due to the centrifugal effect, under the continuous spraying of the liquid inlet nozzle 52, natural graphite particles will move to the middle of the mixing kettle 3 every moment.

[0033] The above technical solution is implemented by setting up the particle spraying assembly 5. During the stirring process of the mixed liquid, the water pump 51 draws out the liquid in the mixing kettle 3 and then sprays it into the interior of the mixing kettle 3 from the liquid inlet nozzle 52, so that the natural graphite particles move rapidly toward the middle of the mixing kettle 3 along with the solution sprayed from the liquid inlet nozzle 52, thereby some of the natural graphite particles gathered on the inner wall of the mixing kettle 3 move to the middle of the mixing kettle 3, thereby reducing the aggregation of the natural graphite particles and the degree of mutual extrusion contact, and also making use of the solution in the middle of the mixing kettle 3. The natural graphite particles are in full contact with the asphalt solution, are evenly coated, and the stirring time is shortened.

[0034] Refer to the instruction manual Figure 4-Figure 6 In order to ensure that the natural graphite particles are in full contact with the asphalt solution and to reduce the collision and damage of the internal pumping components (such as the impeller) of the water pump 51 to the natural graphite particles during rotation, the water pump 51 should not absorb or only absorb a small amount of natural graphite particles when absorbing the solution in the mixing kettle 3. Specifically, the particle spraying assembly 5 also includes a center tube 53, which is inserted in the middle of the end cover 2. When the end cover 2 is covered on the mixing kettle 3 to close the mixing kettle 3, there is a gap between the center tube 53 and the convex disc 42, and the water inlet end of the water pump 51 is connected to the upper end of the center tube 53.

[0035] Furthermore, the bottom of the central tube 53 has a conical portion 531 , the lower opening diameter of the conical portion 531 is larger than the upper opening diameter, and a plurality of inner stirring ridges 43 are provided in the circumferential direction of the upper surface of the convex disc 42 , and the inner stirring ridges 43 are located directly below the conical portion 531 .

[0036] It should be noted that, during the liquid rotation and stirring process in the mixing kettle 3, due to the centrifugal effect, the natural graphite particles will gather at the inner side wall of the mixing kettle 3, and the natural graphite particles entering the center tube 53 will also be thrown out from the gap. The liquid inlet nozzle 52 is directly opposite to the outer side wall of the center tube 53, so that the natural graphite particles carried by the solution ejected from the liquid inlet nozzle 52 will not enter the center tube 53 from the gap. In this way, the liquid sucked by the water pump 51 does not contain or only contains a small amount of natural graphite particles of smaller particle size. Even if this part of the natural graphite particles will be damaged by the pumping parts of the water pump 51, it will be removed by the subsequent centrifugal separation process. It should be supplemented that the conical portion 531 is set at the bottom of the center tube 53, and its purpose is that during centrifugation, the natural graphite particles located in the conical portion 531 will move downward along the inner side wall of the conical portion 531 and move out from the gap. The setting of the inner stirring ridge 43 is to increase the stirring force in the conical portion 531 so that the natural graphite particles can be moved out faster.

[0037] Furthermore, the inner side wall of the bottom of the mixing kettle 3 is a conical surface 31 that is larger at the top and smaller at the bottom, and the height of the conical surface 31 is lower than the liquid inlet nozzle 52 located at the bottom.

[0038] It should be noted that during the stirring process, the natural graphite particles located at the conical surface 31 will move upward along the inner wall, so that the number of natural graphite particles located at the bottom of the mixing kettle 3 is small, reducing the possibility of entering the interior of the conical portion 531.

[0039] Refer to the instruction manual Figure 6-Figure 7 A vertical drive assembly 6 is provided on the upper surface of the end cover 2, and the vertical drive assembly 6 includes a linear drive component 61 fixedly mounted on the upper surface of the end cover 2, a guide plate 62 is fixedly mounted on the output end of the linear drive component 61, an inclined groove 63 is provided on the side of the guide plate 62, and a roller 64 is rotatably connected to the side wall of the upper end of the central tube 53, and the roller 64 rolls inside the inclined groove 63.

[0040] Furthermore, a rotating ring 44 is rotatably provided on the upper surface of the convex disc 42 , and the rotating ring 44 is located directly below the lower end edge of the conical portion 531 .

[0041] like Figure 7 As shown, the linear drive component 61 drives the guide plate 62 to move to the left, and the roller 64 rolls downward along the inclined groove 63, thereby driving the center tube 53 to move downward, and then the bottom of the tapered portion 531 is pressed on the upper surface of the rotating ring 44. The purpose of setting the rotating ring 44 is to prevent the center tube 53 from rotating when the turntable 4 rotates. Among them, the linear drive component 61 is a cylinder. After the coating is completed, the center tube 53 is driven to move downward by the vertical drive component 6, so that the tapered portion 531 is pressed on the rotating ring 44, which can prevent the natural graphite particles in the mixing kettle 3 from entering the interior of the tapered portion 531. The purpose is to prevent the natural graphite particles in the tapered portion 531 from being difficult to discharge when the discharge port at the bottom position of the side wall of the mixing kettle 3 is opened.

[0042] Refer to the instruction manual Figure 2 and Figure 8 An opening and closing assembly 7 is also provided on the mounting frame 1. The opening and closing assembly 7 includes a fixing column 71 vertically fixedly mounted on the mounting frame 1, a connecting frame 72 is sleeved on the fixing column 71, the mixing kettle 3 is fixedly mounted on the connecting frame 72, the end cover 2 is fixedly mounted on the mounting frame 1, a connecting arm 73 is rotatably connected to the connecting frame 72, and the rotation axis of the connecting arm 73 coincides with the axis of the fixing column 71, a linear drive component 2 74 is fixedly mounted on the mounting frame 1, and the output end of the linear drive component 2 74 is fixedly connected to the connecting arm 73.

[0043] It should be noted that the second linear drive component 74 can drive the mixing kettle 3 to move downward through the connecting arm 73 and the connecting frame 72, so that the mixing kettle 3 is separated from the end cover 2. A push handle 30 is set on the outer wall of the mixing kettle 3. By pulling the push handle 30, the mixing kettle 3 and the connecting frame 72 can be swung around the axis of the fixed column 71 with the fixed column 71, so that the mixing kettle 3 can be moved from the bottom of the end cover 2 to a position on one side, thereby facilitating the cleaning of the interior of the mixing kettle 3 or the addition of natural graphite particles. Among them, the second linear drive component 74 is a cylinder.

[0044] Refer to the instruction manual Figure 6 A reversing valve 57 is installed at the upper end of the central tube 53. The reversing valve 57 has a through port 1 571, a through port 2 572 and a through port 3 573. The water inlet end of the water pump 51 is connected with the through port 2 572 through the liquid extraction pipe 56, and the upper end of the central tube 53 is connected with the through port 1 571. The reversing valve 57 is used to control the connection between the through port 1 571 and the through port 2 572 or the through port 3 573. The water outlet end of the water pump 51 is connected with the liquid collector 54 through the liquid delivery pipe 55.

[0045] It should be noted that when adding asphalt solution to the interior of the mixing kettle 3, the port 1 571 is connected to the port 3 573, and the solution can be added from the port 3 573. During the stirring process, the port 1 571 is connected to the port 2 572, and the solution is circulated through the water pump 51. The reversing valve 57 is a two-position three-way electromagnetic reversing valve.

[0046] Refer to the instruction manual Figure 1 A controller 10 is installed on the mounting frame 1, and the controller 10 controls the actions of electrical components, such as the water pump 51, the reversing valve 57, the linear drive component 1 61, the linear drive component 2 74, and the rotary drive component 8.

[0047] Refer to the instruction manual Fig. 9 In this embodiment, a method for coating lithium battery material powder in liquid phase is also provided, using the above-mentioned lithium battery material powder in liquid phase coating device, comprising the following steps: Step 1: Add lithium battery negative electrode powder particles into the mixing kettle 3, cover the mixing kettle 3 with the end cover 2, and fill the interior of the mixing kettle 3 with asphalt solution from the central tube 53; a feed port 20 can be set on the end cover 2, and lithium battery negative electrode powder particles (natural graphite particles) are added through the feed port 20. When the asphalt solution is added to the mixing kettle 3 from the position of the central tube 53, the end cover 2 is in a state of closing the mixing kettle 3, and the gas in the mixing kettle 3 can be discharged from the feed port 20. After the addition is completed, the feed port 20 can be closed. The purpose of filling the mixing kettle 3 with liquid is to prevent the air from gathering in the middle of the mixing kettle 3 when a vortex is formed in the mixing kettle 3 during stirring, thereby reducing the actual utilization space of the mixing kettle 3.

[0048] Step 2: Use the rotating drive component 8 to drive the turntable 4 to rotate, and gradually increase the speed to 200-250r / min, so that the lithium battery negative electrode powder particles are gathered in the inner wall area of ​​the mixing kettle 3; in the slower speed stage, the natural graphite particles in the conical portion 531 are slowly discharged from the conical portion 531, the purpose of which is to prevent the natural graphite particles from being severely squeezed and damaged at the position between the bottom of the conical portion 531 and the convex plate 42 when the speed is too fast.

[0049] Step 3: The liquid in the mixing kettle 3 is pumped out from the central tube 53 by the water pump 51 and re-injected into the mixing kettle 3 from the liquid inlet nozzle 52, so that the lithium battery negative electrode powder particles gathered in the inner wall area of ​​the mixing kettle 3 move to the middle of the mixing kettle 3, and the process lasts for 20-30 minutes; Step 4: The water pump 51 and the rotary drive component 8 are stopped in sequence, and the discharge port on the mixing kettle 3 is opened to discharge the liquid in the mixing kettle 3 from the discharge port.

[0050] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery material powder liquid phase coating device, characterized in that: The invention comprises a mounting frame (1), the mounting frame (1) being provided with an end cover (2) and a mixing kettle (3), the bottom of the inner side of the mixing kettle (3) being provided with a rotating disk (4), the bottom of the outer side of the mixing kettle (3) being provided with a rotating drive component (8), the output end of the rotating drive component (8) being fixedly connected to the middle of the rotating disk (4), the rotating drive component (8) being used to drive the rotating disk (4) to rotate so as to stir the mixed solution in the mixing kettle (3); The mounting frame (1) is provided with an intra-particle spraying assembly (5), the intra-particle spraying assembly (5) comprising a water pump (51), a plurality of liquid inlet nozzles (52) are fixedly mounted on the outer wall of the mixing kettle (3), the plurality of liquid inlet nozzles (52) are arranged at different heights, the water inlet end of the water pump (51) is connected to the interior of the mixing kettle (3), the water outlet end of the water pump (51) is connected to a liquid collector (54), the liquid collectors (54) are all connected to the plurality of liquid inlet nozzles (52), the water pump (51) extracts liquid from the mixing kettle (3) and then sprays it from the liquid inlet nozzle (52) into the interior of the mixing kettle (3), the liquid sprayed into the interior of the mixing kettle (3) carries the lithium battery negative electrode powder particles gathered on the inner wall of the mixing kettle (3) and moves to the middle of the mixing kettle (3).

2. A lithium battery material powder liquid phase coating device according to claim 1, characterized in that: A convex disc (42) is provided in the middle of the upper surface of the rotating disc (4), and a plurality of external stirring ridges (41) are evenly arranged in the circumferential direction of the convex disc (42).

3. A lithium battery material powder liquid phase coating device according to claim 2, characterized in that: The particle internal spraying assembly (5) further comprises a central tube (53), wherein the central tube (53) is inserted into the middle portion of the end cover (2), and when the end cover (2) is covered on the mixing kettle (3) to close the mixing kettle (3), a gap is formed between the central tube (53) and the convex disc (42), and the water inlet end of the water pump (51) is connected to the upper end of the central tube (53).

4. A lithium battery material powder liquid phase coating device according to claim 3, characterized in that: The bottom of the central tube (53) has a conical portion (531), the opening diameter of the lower end of the conical portion (531) is larger than the opening diameter of the upper end, and a plurality of inner stirring ridges (43) are provided in the circumferential direction of the upper surface of the convex disc (42), and the inner stirring ridges (43) are located directly below the conical portion (531).

5. A lithium battery material powder liquid phase coating device according to claim 4, characterized in that: A vertical drive assembly (6) is provided on the upper surface of the end cover (2), and the vertical drive assembly (6) comprises a linear drive component (61) fixedly mounted on the upper surface of the end cover (2); a guide plate (62) is fixedly mounted on the output end of the linear drive component (61); a slanted groove (63) is provided on the side surface of the guide plate (62); a roller (64) is rotatably connected to the side wall of the upper end of the central tube (53), and the roller (64) rolls inside the slanted groove (63).

6. A lithium battery material powder liquid phase coating device according to claim 5, characterized in that: A rotating ring (44) is rotatably provided on the upper surface of the convex disc (42), and the rotating ring (44) is located directly below the lower end edge of the conical portion (531).

7. A lithium battery material powder liquid phase coating device according to claim 6, characterized in that: The mounting frame (1) is further provided with an opening and closing assembly (7), the opening and closing assembly (7) comprising a fixing column (71) fixedly mounted vertically on the mounting frame (1), a connecting frame (72) sleeved on the fixing column (71), the mixing kettle (3) fixedly mounted on the connecting frame (72), the end cover (2) fixedly mounted on the mounting frame (1), a connecting arm (73) rotatably connected to the connecting frame (72), the rotation axis of the connecting arm (73) coincides with the axis of the fixing column (71), and a second linear drive component (74) is fixedly mounted on the mounting frame (1), the output end of the second linear drive component (74) being fixedly connected to the connecting arm (73).

8. A lithium battery material powder liquid phase coating device according to claim 7, characterized in that: A reversing valve (57) is installed at the upper end of the central tube (53). The reversing valve (57) has a first through port (571), a second through port (572) and a third through port (573). The water inlet end of the water pump (51) is connected to the second through port (572) via a liquid extraction pipe (56). The upper end of the central tube (53) is connected to the first through port (571). The reversing valve (57) is used to control whether the first through port (571) is connected to the second through port (572) or to the third through port (573).

9. A lithium battery material powder liquid phase coating device according to claim 8, characterized in that: The inner side wall of the bottom of the mixing kettle (3) is a conical surface (31) that is larger at the top and smaller at the bottom, and the height of the conical surface (31) is lower than a liquid inlet nozzle (52) located at the bottom.

10. A method for liquid-phase coating of lithium battery material powder, using the device for liquid-phase coating of lithium battery material powder as claimed in claim 9, characterized in that: The following steps are involved: Step 1: Add lithium battery negative electrode powder particles into a mixing kettle (3), cover the mixing kettle (3) with an end cover (2), and fill the mixing kettle (3) with asphalt solution from the central tube (53); Step 2: using a rotary drive component (8) to drive the turntable (4) to rotate, and gradually increasing the rotation speed to 200-250 r / min, so that the lithium battery negative electrode powder particles are gathered on the inner wall area of ​​the mixing kettle (3); Step 3: The liquid in the mixing kettle (3) is pumped out from the central tube (53) by a water pump (51) and sprayed into the interior of the mixing kettle (3) again from the liquid inlet nozzle (52), so that the lithium battery negative electrode powder particles gathered on the inner wall area of ​​the mixing kettle (3) move to the middle of the mixing kettle (3), and the process lasts for 20-30 minutes; Step 4: The water pump (51) and the rotary drive component (8) are stopped in sequence, and the discharge port on the mixing kettle (3) is opened to discharge the liquid in the mixing kettle (3) from the discharge port.

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