Graphene and lithium iron phosphate mixed coating device

Abstract

The invention relates to the technical field of battery preparation, in particular to a graphene and lithium iron phosphate mixed coating device which comprises a mixing box, and the mixing box communicates with a grinding box; the side wall of the mixing box is communicated with a feeding pipe, the top of the base is fixedly connected with a first supporting plate and a second supporting plate, the side wall of the first supporting plate is fixedly connected with the outer side wall of the mixing box, and the top of the mixing box is fixedly communicated with a purging box; the side wall of the second supporting plate is fixedly connected with the outer side wall of the grinding box, and the upper and lower sides of the grinding box symmetrically and fixedly communicate with air inlet boxes. The side wall of one air inlet box is communicated with an air pump; the controller is used for controlling the air pump to operate so as to control input and discharge of inert gas; the mixed coating efficiency of the graphene and the lithium iron phosphate can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery preparation, and particularly to a device for hybrid coating of graphene and lithium iron phosphate. Background Art

[0002] In the field of lithium-ion batteries, lithium iron phosphate (LFP) is widely used in energy storage systems and new energy vehicles as a cathode material due to its excellent cycle stability, safety, and low-cost characteristics. However, the low electronic conductivity and lithium-ion diffusion coefficient of LFP materials limit the further improvement of their high-rate charge-discharge performance and energy density. As a two-dimensional carbon material, graphene has an extremely large specific surface area, excellent electrical conductivity, and good mechanical flexibility. Combining it as a coating or composite material with LFP can significantly increase the density of the conductive network of the electrode, reduce the interfacial impedance, and simultaneously inhibit the structural collapse of LFP particles during cycling.

[0003] In the existing devices for hybrid coating of graphene and lithium iron phosphate, graphene and LFP particles are mixed by a stirring device to obtain a mixture, and then the obtained mixture is transferred to a grinding device for grinding. After grinding, an inert gas is introduced to enhance the binding stability of graphene and LFP, and then cooling is carried out to obtain the finished product. Although such a method can successfully prepare the finished product, it requires operating multiple devices, resulting in complex manufacturing steps and high preparation costs.

[0004] In summary, how to solve the problem in the existing hybrid coating technology of graphene and lithium iron phosphate that multiple devices need to be operated during the preparation of the finished product, resulting in complex manufacturing steps and high preparation costs has become a difficult problem that needs to be solved urgently in the current field. Therefore, it is necessary to propose a more reasonable device for hybrid coating of graphene and lithium iron phosphate. Summary of the Invention

[0005] To solve the above problems, the present invention provides a device for hybrid coating of graphene and lithium iron phosphate, which integrates multiple steps such as mixing, transferring, and grinding of graphene and lithium iron phosphate into the same device for joint operation, without the need to operate multiple devices, greatly reducing the complexity and preparation cost of finished product preparation.

[0006] To achieve the above object, the technical solution of the present invention is as follows: A graphene and lithium iron phosphate hybrid coating device, including a mixing tank, which is connected to a grinding tank; a feeding pipe is connected to the side wall of the mixing tank, and it also includes a base and a controller. A first support plate and a second support plate are fixedly connected to the top of the base. The side wall of the first support plate is fixedly connected to the outer wall of the mixing tank, and a purging tank is fixedly connected to the top of the mixing tank; the side wall of the second support plate is fixedly connected to the outer wall of the grinding tank, and air inlet tanks are symmetrically and fixedly connected to the upper and lower sides of the grinding tank; an air pump is connected to the side wall of one of the air inlet tanks; the controller is used to control the operation of the air pump, thereby controlling the input and discharge of inert gas.

[0007] A purging component for driving purging raw materials is provided in the purging tank, a mixing component for mixing raw materials is provided in the mixing tank, and a grinding component for grinding raw materials is provided in the grinding tank; guiding components for guiding the mixing of inert gas and raw materials are provided in the air inlet tanks.

[0008] A driving member is fixedly connected to the base, and a rotating shaft is coaxially and fixedly connected to the output shaft of the driving member; the top of the rotating shaft sequentially penetrates the mixing tank and extends into the purging tank, and both the mixing tank and the purging tank are rotationally matched with the rotating shaft; the controller is used to control the operation of the driving member, thereby driving the rotation of the rotating shaft, and the rotating shaft will drive the purging component and the mixing component to operate; a transmission component for simultaneously driving the grinding component and the guiding component to operate is also provided on the rotating shaft.

[0009] The technical principle of the above solution is as follows:

[0010] Graphene and lithium iron phosphate are added to the mixing tank through the feeding pipe, and then the driving member is started through the controller. The output shaft of the driving member will drive the rotation of the rotating shaft; the rotating shaft will drive the mixing component to crush and mix the raw materials; after the raw materials are mixed, the rotating shaft will also drive the purging component to purge the raw materials, thereby purging the raw materials into the grinding tank. The transmission component will drive the grinding component to grind the raw materials. At the same time, the air pump is opened through the controller to input inert gas into the air inlet tank, and the guiding component is used to make the inert gas flow reciprocally in the grinding tank and contact the raw materials evenly, so that graphene and lithium iron phosphate are further combined to obtain the finished product.

[0011] The following are the beneficial effects of adopting the above solution:

[0012] 1. When preparing the graphene and lithium iron phosphate mixture in the prior art, multiple devices such as stirring equipment, grinding equipment, and transfer equipment are required, resulting in a substantial increase in the preparation cost; in the present invention, multiple steps such as stirring, grinding, and purging of the raw materials are integrated into the same device for operation, without the need for multiple devices, which can greatly reduce the preparation cost.

[0013] 2. In the prior art, since the raw materials need to be transported multiple times, they will come into contact with the external air and impurities during the transportation process, which will affect the quality of the raw materials. At the same time, the raw materials may also spill during the transportation process, resulting in waste of raw materials. Through the integrated design of the present invention, it is possible to avoid environmental pollution of the raw materials by the outside world, prevent the raw materials from spilling, thereby improving the utilization rate of the raw materials and the quality of the finished products.

[0014] 3. In the prior art, although inert gas is used to help graphene and lithium iron phosphate further combine, due to the poor fluidity of the inert gas itself and the lack of flow guidance for the inert gas in the prior art, the contact between the raw materials and the inert gas is insufficient, resulting in poor binding effect between graphene and lithium iron phosphate. Through the design of the guiding component of the present invention, the inert gas can flow reciprocally in the grinding box, thereby optimizing the contact uniformity and sufficiency between the inert gas and the raw materials, and thus optimizing the binding effect between graphene and lithium iron phosphate.

[0015] Further, the purging component includes a plurality of fan blades, the fan blades are all located on the rotating shaft in the purging box, and a first control valve is connected to the communication part between the purging box and the mixing box; the controller is used to control the operation of the first control valve, thereby controlling the flow of the air flow; an air inlet is opened on the side wall of the purging box.

[0016] Beneficial effect: When the rotating shaft rotates, the rotating shaft will drive the fan blades to rotate, thereby generating an air flow; when the mixing of the raw materials is completed, the first control valve is opened through the controller, and the air flow will enter the mixing box through the first control valve, and purge the raw materials in the mixing box into the grinding box for subsequent grinding.

[0017] Further, the mixing component includes a plurality of stirring rods fixedly connected to the middle part of the rotating shaft along its circumferential direction, and a second control valve is connected to the communication part between the mixing box and the grinding box; the controller is used to control the operation of the second control valve, thereby controlling the flow of the raw materials.

[0018] Beneficial effect: When the rotating shaft rotates, the rotating shaft will drive the stirring rods to rotate, thereby stirring, crushing and mixing the raw materials.

[0019] Further, the inner side wall of the grinding box is elliptical; the grinding component includes a plurality of grinding balls rotatably matched with the inner side wall of the grinding box, a rotating rod is fixedly connected to each grinding ball, the rotating rods all penetrate through the side wall of the grinding box and are coaxially fixedly connected with gears, and the gears are all rotatably matched with the outer side wall of the grinding box; the transmission component is used to drive the gears to rotate, thereby driving the rotating rods and the grinding balls to rotate.

[0020] Beneficial effect: When the driving part is started, the transmission component will drive the gears to rotate, thereby driving the rotating rods and the grinding balls to rotate. When the grinding balls rotate, they will grind the raw materials in the grinding box, making the raw materials further refined; it is convenient for subsequent uniform coating of lithium iron phosphate with graphene.

[0021] Further, connecting rods are fixedly connected to the side walls of the rotating rod, and arc-shaped plates are fixedly connected to the ends of the connecting rods away from the rotating rod. The arc-shaped plates are rotationally engaged with the inner side walls of the grinding box.

[0022] Beneficial effects: Since graphene and lithium iron phosphate are easily adhered to the inner side wall of the grinding box, when the rotating rod rotates, the arc-shaped plates can scrape the graphene and lithium iron phosphate adhered to the inner side wall of the grinding box, thereby improving the utilization rate of raw materials.

[0023] Further, the guiding assembly includes a piston plate slidably engaged with the inner side wall of the air inlet box; third control valves are connected to the communication parts between the air inlet box and the grinding box, and the controller is used to control the operation of the third control valves, thereby controlling the flow of inert gas; bent rods are fixedly connected to the sides of the piston plate away from the third control valves, and the ends of the bent rods away from the piston plate penetrate through the adjacent air inlet box and are slidably engaged with it vertically; a transmission assembly is used to drive the bent rods to move vertically.

[0024] Beneficial effects: When the driving part is started, the transmission assembly will drive the bent rods to move vertically, and then drive the piston plate to slide vertically in the air inlet box to suck the inert gas, so that the inert gas flows back and forth between the grinding box and the two air inlet boxes, so as to contact the raw materials fully and evenly, and improve the bonding effect of graphene and lithium iron phosphate.

[0025] Further, the transmission assembly includes a turntable coaxially and fixedly connected to the rotating shaft. An annular wave groove is formed on the side wall of the turntable. A limiting block is slidably engaged in the wave groove. A rack is fixedly connected to the side of the limiting block away from the wave groove. The gears are all engaged with the rack; the rack is slidably engaged with the outer side wall of the grinding box vertically; the ends of the bent rods away from the piston plate are fixedly connected to the rack.

[0026] Beneficial effects: When the rotating shaft rotates, the turntable will also rotate. Due to the limitation of the wave groove, the limiting block will drive the rack to slide vertically on the outer side wall of the grinding box; the rack will drive the gear to rotate reciprocally, and then drive the rotating rod and the grinding balls to rotate reciprocally in the grinding box to grind the raw materials; at the same time, the rack will also drive the bent rods to move up and down, and then drive the piston plate to suck the inert gas, improving the fluidity of the inert gas.

[0027] Further, a sliding rod is fixedly connected to the rack. A sliding groove for the vertical sliding of the sliding rod is formed on the side wall of the grinding box. The sliding rod extends into the grinding box and is fixedly connected with a sieve; the length of the rack is greater than the length of the sliding groove.

[0028] Beneficial effects: When the rack slides vertically, the sliding rod will slide up and down along the sliding groove, and then drive the sieve to continuously oscillate the raw materials in the grinding box. The smaller raw materials will pass through the sieve, and the larger raw materials will be left on the sieve and gradually oscillated to the position of the grinding balls by the sieve, thereby improving the uniformity of raw material grinding.

[0029] Furthermore, a sealing sleeve is fixedly connected to the rotating mating part between the bottom wall of the mixing box and the rotating shaft.

[0030] Beneficial effects: The sealing sleeve can improve the sealing performance of the mixing box and prevent raw materials from leaking.

[0031] Furthermore, a heat dissipation box is fixedly connected to the outside of the driving member. An air inlet and an air outlet are formed in the side wall of the heat dissipation box, and the air inlet is communicated with the purging box.

[0032] Beneficial effects: When the fan blades rotate, the airflow generated by the fan blades will also enter the heat dissipation box from the purging box through the air inlet and then flow out from the air outlet, thereby purging and dissipating heat from the driving member and extending the service life of the driving member.

[0033] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an axonometric view of the graphene and lithium iron phosphate hybrid coating device of the present invention.

[0035] Figure 2 It is a front sectional view of the graphene and lithium iron phosphate hybrid coating device of the present invention.

[0036] Figure 3 It is an axonometric view of the transmission component in the graphene and lithium iron phosphate hybrid coating device of the present invention.

[0037] Figure 4 It is an internal axonometric view of the grinding box in the graphene and lithium iron phosphate hybrid coating device of the present invention.

[0038] Figure 5 It is an axonometric view of the grinding box and the grinding balls in the graphene and lithium iron phosphate hybrid coating device of the present invention.

[0039] The reference numerals in the accompanying drawings of the specification include: 1, mixing box; 2, grinding box; 3, feeding pipe; 4, base; 5, first support plate; 6, second support plate; 7, purging box; 8, air inlet box; 9, air pump; 10, reduction motor; 11, rotating shaft; 12, fan blades; 13, first control valve; 14, stirring rod; 15, heat dissipation box; 16, grinding balls; 17, rotating rod; 18, gear; 19, connecting rod; 20, arc plate; 21, piston plate; 22, third control valve; 23, wave groove; 24, bent rod; 25, turntable; 26, limit block; 27, rack; 28, sliding rod; 29, screen; 30, sealing sleeve. DETAILED DESCRIPTION OF THE INVENTION

[0040] The following is a further detailed description through specific embodiments:

[0041] Example 1:

[0042] As shown in the Figures 1 - 5 accompanying drawings: The graphene and lithium iron phosphate hybrid coating device includes a mixing tank 1, and the mixing tank 1 is connected to a grinding tank 2; a feeding pipe 3 is connected to the side wall of the mixing tank 1, and it also includes a base 4 and a controller. A first support plate 5 and a second support plate 6 are welded to the top of the base 4. The side wall of the first support plate 5 is welded to the outer wall of the mixing tank 1, and a purge tank 7 is bolted and connected to the top of the mixing tank 1; the side wall of the second support plate 6 is welded to the outer wall of the grinding tank 2, and air inlet tanks 8 are symmetrically welded and connected to the upper and lower sides of the grinding tank 2; an air pump 9 is connected to the side wall of the upper air inlet tank 8; the controller is used to control the operation of the air pump 9, thereby controlling the input and discharge of inert gas.

[0043] A purge component for driving the purge raw materials is provided in the purge tank 7, a mixing component for mixing the raw materials is provided in the mixing tank 1, and a grinding component for grinding the raw materials is provided in the grinding tank 2; guiding components for guiding the mixing of the inert gas and the raw materials are provided in the air inlet tanks 8.

[0044] As Figure 1 shown, a driving member is bolted and connected to the base 4, and an output shaft of the driving member is coaxially bolted and connected to a rotating shaft 11; the top of the rotating shaft 11 sequentially passes through the mixing tank 1 and extends into the purge tank 7, and both the mixing tank 1 and the purge tank 7 are rotationally matched with the rotating shaft 11; the controller is used to control the operation of the driving member, thereby driving the rotation of the rotating shaft 11, and the rotating shaft 11 will drive the purge component and the mixing component to operate; a transmission component for simultaneously driving the grinding component and the guiding component to operate is also provided on the rotating shaft 11.

[0045] As Figure 2 shown, the purge component includes a plurality of fan blades 12, and the fan blades 12 are all located on the rotating shaft 11 in the purge tank 7. A first control valve 13 is connected to the connection between the purge tank 7 and the mixing tank 1; the controller is used to control the operation of the first control valve 13, thereby controlling the flow of air; an air inlet is opened on the side wall of the purge tank 7.

[0046] As Figure 2 shown, the mixing component includes a plurality of stirring rods 14 welded along the circumference of the middle part of the rotating shaft 11. A second control valve (not shown in the figure) is connected to the connection between the mixing tank 1 and the grinding tank 2; the controller is used to control the operation of the second control valve, thereby controlling the flow of raw materials. A sealing sleeve 30 is fixedly bonded to the rotational matching part of the bottom wall of the mixing tank 1 and the rotating shaft 11, and the sealing sleeve 30 can improve the sealing performance of the mixing tank 1 and prevent raw materials from leaking.

[0047] As Figure 4 and Figure 5As shown, the inner sidewall of the grinding box 2 is oval; the grinding assembly includes a number of grinding balls 16 rotatably engaged with the inner sidewall of the grinding box 2. Rotating rods 17 are welded to the grinding balls 16. The rotating rods 17 all penetrate the sidewall of the grinding box 2 and are coaxially bolted to a gear 18. The gears 18 are all rotatably engaged with the outer sidewall of the grinding box 2; the transmission assembly is used to drive the gears 18 to rotate, thereby driving the rotating rods 17 and the grinding balls 16 to rotate.

[0048] Connecting rods 19 are welded to the sidewalls of the rotating rods 17. Arc-shaped plates 20 are welded to the ends of the connecting rods 19 away from the rotating rods 17. The arc-shaped plates 20 are all rotatably engaged with the inner sidewall of the grinding box 2.

[0049] As Figure 2 shown, the guiding assembly includes a piston plate 21 slidably engaged with the inner sidewall of the air inlet box 8; third control valves 22 are connected to the communication parts between the air inlet box 8 and the grinding box 2. The controller is used to control the operation of the third control valves 22, thereby controlling the flow of inert gas; Bent rods 24 are bolted to the sides of the piston plate 21 away from the third control valves 22. The ends of the bent rods 24 away from the piston plate 21 all penetrate the adjacent air inlet box 8 and are vertically slidably engaged with it; the transmission assembly is used to drive the bent rods 24 to move vertically.

[0050] As Figure 3 shown, the transmission assembly includes a turntable 25 coaxially bolted to the rotating shaft 11. An annular wave groove 23 is formed in the sidewall of the turntable 25. A limiting block 26 is slidably engaged in the wave groove 23. A rack 27 is bolted to the right side of the limiting block 26. The gears 18 are all engaged with the rack 27; the rack 27 is vertically slidably engaged with the outer sidewall of the grinding box 2; the ends of the bent rods 24 away from the piston plate 21 are all bolted to the rack 27.

[0051] As Figure 4 shown, a sliding rod 28 is bolted to the rack 27. A sliding groove for the vertical sliding of the sliding rod 28 is formed in the sidewall of the grinding box 2. The sliding rod 28 extends into the grinding box 2 and is fixedly bonded with a screen 29. The length of the rack 27 is greater than the length of the sliding groove, and the rack 27 can block the sliding groove to prevent the raw material from leaking from the sliding groove.

[0052] In this embodiment, the driving member is a reduction motor 10.

[0053] The specific implementation process is as follows:

[0054] Taking Figure 2 as an example, first, raw materials (graphene and lithium iron phosphate) are added to the mixing box 1 through the feeding pipe 3, and then the reduction motor 10 is started through the controller. The output shaft of the reduction motor 10 will drive the rotating shaft 11 to rotate; when the rotating shaft 11 rotates, the rotating shaft 11 will drive the stirring rod 14 to rotate, thereby stirring, crushing and mixing the raw materials in the mixing box 1.

[0055] When the rotating shaft 11 rotates, the rotating shaft 11 will also drive the fan blade 12 to rotate, thereby generating an air flow; when the raw materials are mixed, the first control valve 13 is opened through the controller, and the air flow will enter the mixing box 1 through the first control valve 13, and the raw materials in the mixing box 1 will be purged into the grinding box 2 for subsequent grinding.

[0056] Take Figure 2 and Figure 3 as an example. When the rotating shaft 11 rotates, the rotating shaft 11 will also drive the turntable 25 to rotate. Due to the limitation of the wave groove 23, the limiting block 26 will drive the rack 27 to slide up and down along the outer wall of the grinding box 2; since the rack 27 meshes with the gear 18, the rack 27 will drive the gear 18 to rotate reciprocally, and then drive the rotating rod 17 and the grinding balls 16 to rotate reciprocally in the grinding box 2 to grind the raw materials in the grinding box 2.

[0057] Take Figure 2 as an example. During the grinding process, the air pump 9 and the third control valve 22 are opened through the controller, and an inert gas (argon is selected in this embodiment) is transported into the upper intake box 8 by the air pump 9, so that the inert gas flows from the upper intake box 8 into the grinding box 2 and then into the lower intake box 8 under its own gravity. At the same time, the rack 27 will also drive the bent rod 24 to move up and down, and then drive the piston plate 21 to slide vertically in the intake box 8, thereby sucking the inert gas to improve the fluidity of the inert gas; when the rack 27 moves downward, the upper piston plate 21 will move downward, and the upper piston plate 21 will squeeze the inert gas in the upper intake box 8 into the grinding box 2. At the same time, the lower piston plate 21 will also move downward to suck the inert gas in the intake box 8 to accelerate the downward flow rate of the inert gas; on the contrary, the piston plates 21 all move upward, causing the inert gas to flow upward, and so on, to improve the fluidity of the inert gas, thereby improving the bonding effect of the raw materials and obtaining a higher-quality finished product.

[0058] During the process of introducing the inert gas, the temperature of the introduced inert gas will gradually increase from 20°C to 500°C. Due to the effect of the piston plate 21, the fluidity of the inert gas is relatively strong. Therefore, the raw materials in the grinding box 2 will be heated more fully and evenly; when the introduction of the inert gas stops, the inert gas in the grinding box 2 will accelerate its own heat dissipation during the reciprocating flow process, thereby facilitating the cooling of the finished product.

[0059] A material taking port (not shown in the figure) is provided on the side wall of the grinding box 2. When the finished product is completely cooled, the operator can open the material taking port to obtain the finished product.

[0060] In this embodiment, multiple steps such as stirring, grinding, and purging of raw materials are integrated into the same device, eliminating the need for multiple devices and significantly reducing the preparation cost. Through the integrated design, it is possible to prevent the raw materials from being polluted by the external environment and prevent the raw materials from spilling, thereby improving the utilization rate of the raw materials and the quality of the finished products.

[0061] Embodiment 2:

[0062] As shown in the attached Figure 1 and Figure 2 figure, different from the above embodiment, a heat dissipation box 15 is fixedly connected to the outside of the reduction motor 10 by bolts. The side wall of the heat dissipation box 15 is provided with an air inlet and an air outlet, and the air inlet is communicated with the purging box 7.

[0063] The specific implementation process is as follows: When the reduction motor 10 is started, the output shaft of the reduction motor 10 drives the rotating shaft 11 and the fan blade 12 to rotate. The airflow generated by the fan blade 12 enters the heat dissipation box 15 from the purging box 7 through the air inlet and then flows out from the air outlet, thereby purging and dissipating heat from the reduction motor 10 and improving the service life of the reduction motor 10.

[0064] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. Graphene and lithium iron phosphate hybrid coating device, including a mixing tank (1), the mixing tank (1) is connected to a grinding tank (2); a feeding pipe (3) is connected to the side wall of the mixing tank (1), characterized in that, It further includes a base (4) and a controller. A first support plate (5) and a second support plate (6) are fixedly connected to the top of the base (4). The side wall of the first support plate (5) is fixedly connected to the outer side wall of the mixing box (1), and the top of the mixing box (1) is fixedly communicated with a purging box (7). The side wall of the second support plate (6) is fixedly connected to the outer side wall of the grinding box (2). Air inlet boxes (8) are symmetrically and fixedly communicated with the upper and lower sides of the grinding box (2). An air pump (9) is communicated with the side wall of one of the air inlet boxes (8). The controller is used to control the operation of the air pump (9), thereby controlling the input and discharge of inert gas. A purging component for driving purging raw materials is provided in the purging box (7), a mixing component for mixing raw materials is provided in the mixing box (1), and a grinding component for grinding raw materials is provided in the grinding box (2). Guiding components for guiding the mixing of inert gas and raw materials are provided in the air inlet boxes (8). A driving member is fixedly connected to the base (4), and a rotating shaft (11) is coaxially and fixedly connected to the output shaft of the driving member. The top of the rotating shaft (11) sequentially penetrates through the mixing box (1) and extends into the purging box (7). Both the mixing box (1) and the purging box (7) are rotationally matched with the rotating shaft (11). The controller is used to control the operation of the driving member, thereby driving the rotation of the rotating shaft (11), and the rotating shaft (11) will drive the purging component and the mixing component to operate. A transmission component for simultaneously driving the grinding component and the guiding component to operate is further provided on the rotating shaft (11).

2. The graphene and lithium iron phosphate hybrid coating device according to claim 1, characterized in that, The purging component includes a plurality of fan blades (12). The fan blades (12) are all located on the rotating shaft (11) in the purging box (7). A first control valve (13) is communicated at the connection between the purging box (7) and the mixing box (1). The controller is used to control the operation of the first control valve (13), thereby controlling the flow of air. An air inlet is provided on the side wall of the purging box (7).

3. The graphene and lithium iron phosphate hybrid coating device according to claim 2, wherein The mixing component includes a plurality of stirring rods (14) fixedly connected to the middle part of the rotating shaft (11) along its circumference. A second control valve is communicated at the connection between the mixing box (1) and the grinding box (2). The controller is used to control the operation of the second control valve, thereby controlling the flow of raw materials.

4. The graphene and lithium iron phosphate hybrid coating device according to claim 3, characterized in that, The inner side wall of the grinding box (2) is elliptical. The grinding component includes a plurality of grinding balls (16) rotationally matched with the inner side wall of the grinding box (2). Rotating rods (17) are fixedly connected to the grinding balls (16). The rotating rods (17) all penetrate through the side wall of the grinding box (2) and are coaxially and fixedly connected with gears (18). The gears (18) are all rotationally matched with the outer side wall of the grinding box (2). The transmission component is used to drive the rotation of the gears (18), thereby driving the rotation of the rotating rods (17) and the grinding balls (16).

5. The graphene and lithium iron phosphate hybrid coating device according to claim 4, characterized in that, Link rods (19) are fixedly connected to the side walls of the rotating rods (17). Arc-shaped plates (20) are fixedly connected to the ends of the link rods (19) away from the rotating rods (17). The arc-shaped plates (20) are all rotationally matched with the inner side wall of the grinding box (2).

6. The graphene and lithium iron phosphate hybrid coating device according to claim 5, wherein, The guiding component includes a piston plate (21) that is slidably fitted with the inner side wall of the intake box (8); third control valves (22) are connected to the communication parts between the intake box (8) and the grinding box (2), and the controller is used to control the operation of the third control valves (22), thereby controlling the flow of inert gas; bent rods (24) are fixedly connected to the sides of the piston plate (21) away from the third control valves (22), and the ends of the bent rods (24) away from the piston plate (21) penetrate through the adjacent intake box (8) and are slidably fitted with it vertically; the transmission component is used to drive the bent rods (24) to move vertically.

7. The graphene and lithium iron phosphate hybrid coating device according to claim 6, characterized in that, The transmission component includes a turntable (25) that is coaxially and fixedly connected to the rotating shaft (11). An annular wave groove (23) is formed in the side wall of the turntable (25). A limiting block (26) is slidably fitted in the wave groove (23). A rack (27) is fixedly connected to the side of the limiting block (26) away from the wave groove (23). Gears (18) are all meshed with the rack (27); the rack (27) is slidably fitted with the outer side wall of the grinding box (2) vertically; the ends of the bent rods (24) away from the piston plate (21) are fixedly connected to the rack (27).

8. The graphene and lithium iron phosphate hybrid coating device according to claim 7, characterized in that, A sliding rod (28) is fixedly connected to the rack (27). A sliding groove for the vertical sliding of the sliding rod (28) is formed in the side wall of the grinding box (2). The sliding rod (28) extends into the grinding box (2) and is fixedly connected to a sieve (29); the length of the rack (27) is greater than the length of the sliding groove.

9. The graphene and lithium iron phosphate hybrid coating device according to claim 8, wherein, A sealing sleeve (30) is fixedly connected to the rotating and mating part of the bottom wall of the mixing box (1) and the rotating shaft (11).

10. The graphene and lithium iron phosphate hybrid coating device according to claim 9, characterized in that, A heat dissipation box (15) is fixedly connected to the outside of the driving part. An air inlet and an air outlet are formed in the side wall of the heat dissipation box (15), and the air inlet is communicated with the purging box (7).

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