A lithium battery positive electrode material coating device

Abstract

The present invention relates to the technical field of lithium battery production, and in particular to a lithium battery positive electrode material coating device, including a tank body, a movable component, a filter membrane, a fixed ring, a mixing component and a shaking component, etc.; a feed pipe is provided on the tank body; a discharge pipe is provided on the tank body; a feeding pipe is provided on the tank body; a discharge pipe is provided on the tank body; a movable component is connected to the tank body; a filter membrane for filtering lithium iron phosphate finished products and carbon sources is connected to the movable component; a fixed ring for fixing the filter membrane is provided on the outside of the filter membrane; a connecting block is provided on the filter membrane; a mixing component for mixing carbon sources and lithium iron phosphate is connected to the connecting block; and a shaking component for deforming the filter membrane is connected to the fixed ring. The present invention realizes that the filter membrane is repeatedly raised and lowered in the tank body, so that the excess carbon source particles in the lithium iron phosphate finished product can pass through the filter membrane and contact with the lithium iron phosphate powder at the bottom of the tank body, thereby separating the lithium iron phosphate finished product and the excess carbon source particles, and improving the utilization rate of the carbon source particles.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a lithium battery positive electrode material coating device. Background Art

[0002] Lithium iron phosphate is a commonly used positive electrode material for lithium-ion batteries. In order to improve the conductivity and cycle performance of lithium iron phosphate, it is necessary to perform liquid phase deposition carbon coating on the lithium iron phosphate, which refers to the process of forming a carbon layer on the surface of the lithium iron phosphate positive electrode material.

[0003] When carbon-coating lithium iron phosphate, it is necessary to add lithium iron phosphate powder to a carbon source solution (an organic compound solution such as glucose or sucrose) and stir it under appropriate temperature and pH conditions. During this process, carbon source particles will precipitate from the carbon source solution and adhere to the surface of the lithium iron phosphate powder to form a carbon coating layer. When the carbon source particles adhering to the surface of the lithium iron phosphate powder are saturated, the carbon source particles continuously precipitated from the carbon source solution cannot adhere to the surface of the lithium iron phosphate powder, resulting in excess carbon source particles. After the carbon coating of the lithium iron phosphate is completed, the lithium iron phosphate product and the carbon source particles need to be separated, which not only increases the workload of carbon coating of the lithium iron phosphate, but also reduces the utilization rate of the carbon source particles in the carbon source solution. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art that, when carbon-coating lithium iron phosphate, excess carbon source particles cannot be separated and reused from the finished lithium iron phosphate product, thereby increasing the overall workload of carbon-coating lithium iron phosphate and reducing the utilization rate of carbon source particles in the carbon source solution, the present invention provides a lithium battery positive electrode material coating device.

[0005] Technical solution: A lithium battery positive electrode material coating device, including a tank body and a heating plate; a feed pipe is provided on the tank body; a discharge pipe is provided on the tank body; a loading pipe is provided on the tank body; a unloading pipe is provided on the tank body; a compartment is opened on the tank body; a heating plate is provided in the compartment; also including a movable component, a filter membrane, a fixed ring, a mixing component and a shaking component; a movable component is connected to the tank body; a filter membrane for filtering lithium iron phosphate products and carbon sources is connected to the movable component; a fixed ring for fixing the filter membrane is provided on the outside of the filter membrane; a connecting block is provided on the filter membrane; a mixing component for mixing carbon source and lithium iron phosphate is connected to the connecting block; a shaking component for deforming the filter membrane is connected to the fixed ring.

[0006] More preferably, the movable component includes a driving member, an upper limit block and a lower limit block; the driving member is fixedly connected to the upper side of the tank body; the telescopic end of the driving member is fixedly connected to the connecting block; a plurality of upper limit blocks for blocking the rising of the fixing ring are fixedly connected to the inner wall of the tank body; a plurality of lower limit blocks for blocking the descending of the fixing ring are fixedly connected to the inner wall of the tank body; the upper limit block is located above the lower limit block.

[0007] More preferably, the mixing assembly includes a DD motor, a fixing frame and a stirring paddle; the connecting block is configured as a hollow structure; the DD motor is fixedly connected to the inside of the connecting block; the output end of the DD motor is fixedly connected to the fixing frame; and a plurality of stirring paddles for mixing the carbon source and lithium iron phosphate are fixedly connected to the fixing frame.

[0008] More preferably, the shaking assembly includes an elastic part, a block and a protrusion; a plurality of movable grooves are opened on the fixed ring; an elastic part is fixedly connected in each movable groove; a block is slidably connected in each movable groove; each block is fixedly connected to the corresponding elastic part; and a plurality of protrusions are fixedly connected to the inner wall of the tank body.

[0009] More preferably, it further includes reinforcing ribs; a plurality of reinforcing ribs for supporting and reinforcing the filter membrane are fixedly connected to the outer side of the connecting block; and the other end of each reinforcing rib is fixedly connected to the lower side of the fixing ring.

[0010] More preferably, each reinforcing rib is arranged in a bent state.

[0011] More preferably, it further comprises a telescopic tube; the telescopic tube is fixedly connected to the inner side of the tank body; the telescopic end of the telescopic tube is fixedly connected to the telescopic end of the driving member; a plurality of through holes are opened on the telescopic tube; each through hole faces the middle of the filter membrane.

[0012] More preferably, a plurality of collecting grooves for collecting bubbles are provided on the lower side of the fixing ring.

[0013] More preferably, a defoaming system is also included, which includes a movable tube and an exhaust pipe; a plurality of movable tubes for transmitting bubbles are fixedly connected to the fixed ring; each movable tube is connected to the corresponding collecting tank; a plurality of exhaust pipes for discharging bubbles are fixedly connected to the inner wall of the tank body; each movable tube is connected to the corresponding exhaust pipe and is slidably connected.

[0014] More preferably, it also includes bristles; a plurality of bristles are fixedly connected to the upper side of the fixing frame for cleaning bubbles adhering to the lower side of the filter membrane.

[0015] Compared with the prior art, the present invention has the following advantages: the present invention realizes repeated lifting and lowering of the filter membrane in the tank body, so that the excess carbon source particles in the lithium iron phosphate finished product can pass through the filter membrane and contact the lithium iron phosphate powder at the bottom of the tank body, thereby separating the lithium iron phosphate finished product and the excess carbon source particles and improving the utilization rate of the carbon source particles;

[0016] The filter membrane is supported by reinforcing ribs to prevent the filter membrane from being pulled and damaged during the lifting process, thereby enhancing the protection effect of the filter membrane;

[0017] The carbon source solution is sprayed out from the through hole through the telescopic tube, so as to reduce the lithium iron phosphate product adhering to the middle of the upper side of the filter membrane, so that the carbon source particles can pass through the filter membrane and contact the lithium iron phosphate powder at the bottom of the tank, further enhancing the separation effect of the lithium iron phosphate product and the carbon source particles;

[0018] The bristles are driven to rotate by the fixed frame to brush the bubbles adhering to the lower side of the filter membrane into a loose state, preventing the bubbles from adhering to the lower side of the filter membrane, avoiding the reduction of the filtration area of ​​the filter membrane, and improving the filtration efficiency of carbon source particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the lithium battery positive electrode material coating device of the present invention;

[0020] Figure 2 It is a cross-sectional view of the tank body of the present invention;

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the filter membrane, the fixing ring, the reinforcing ribs and the mixing assembly of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the filter membrane, the fixing ring and the shaking assembly of the present invention;

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the filter membrane, telescopic tube and mixing assembly of the present invention;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the filter membrane, fixed ring and defoaming system combination of the present invention.

[0025] Among them, the above-mentioned drawings include the following drawing marks: 1-tank body, 1001-feed pipe, 1002-discharge pipe, 1003-upper pipe, 1004-lower pipe, 1005-compartment, 2-heating plate, 3-filter membrane, 3001-connecting block, 4-fixing ring, 4001-movable groove, 4002-collecting groove, 5-reinforcement rib, 6-telescopic tube, 6001-through hole, 101-driving member, 102-upper limit block, 103-lower limit block, 201-DD motor, 202-fixed frame, 203-stirring paddle, 301-elastic member, 302-block, 303-bump, 401-movable pipe, 402-exhaust pipe, 403-brush. DETAILED DESCRIPTION

[0026] Although the present invention may be described with respect to a particular application or industry, those skilled in the art will recognize the broader applicability of the present invention. Those of ordinary skill in the art will recognize that terms such as above, below, upward, downward, etc. are used to describe the drawings and do not represent limitations on the scope of the present invention as defined by the appended claims. Any numerical designations such as first or second are merely exemplary and are not intended to limit the scope of the present invention in any way.

[0027] Example 1

[0028] like Figure 1-Figure 5 As shown, a lithium battery positive electrode material coating device includes a tank body 1 and a heating plate 2; a feed pipe 1001 is provided on the tank body 1; a discharge pipe 1002 is provided on the tank body 1; a feed pipe 1003 is provided on the tank body 1; a discharge pipe 1004 is provided on the tank body 1; a compartment 1005 is opened on the tank body 1; and a heating plate 2 is provided in the compartment 1005;

[0029] It also includes a movable component, a filter membrane 3, a fixed ring 4, a mixing component and a shaking component; the movable component is connected to the tank body 1; the filter membrane 3 is connected to the movable component; a fixed ring 4 is arranged on the outside of the filter membrane 3; a connecting block 3001 is arranged on the filter membrane 3; the mixing component is connected to the connecting block 3001; and the shaking component is connected to the fixed ring 4.

[0030] The movable component includes a driving member 101, an upper limit block 102 and a lower limit block 103; the driving member 101 is fixedly connected to the upper side of the tank body 1, and the driving member 101 is an electric push rod; the telescopic end of the driving member 101 is fixedly connected to the connecting block 3001; a plurality of upper limit blocks 102 in a circular array are fixedly connected to the inner wall of the tank body 1; a plurality of lower limit blocks 103 in a circular array are fixedly connected to the inner wall of the tank body 1; the upper limit block 102 is located above the lower limit block 103.

[0031] The mixing assembly includes a DD motor 201, a fixing frame 202 and a stirring paddle 203; the connecting block 3001 is configured as a hollow structure; the DD motor 201 is fixedly connected inside the connecting block 3001; the output end of the DD motor 201 is fixedly connected to the fixing frame 202; and a plurality of stirring paddles 203 in a ring array are fixedly connected to the fixing frame 202.

[0032] The shaking assembly includes an elastic member 301, a clamping block 302 and a protrusion 303; a plurality of movable grooves 4001 in a circular array are provided on the fixed ring 4; an elastic member 301 is fixedly connected in each movable groove 4001, and the elastic member 301 is a spring; a clamping block 302 is slidably connected in each movable groove 4001; each clamping block 302 is fixedly connected to the corresponding elastic member 301; a plurality of protrusions 303 in a circular array are fixedly connected to the inner wall of the tank body 1.

[0033] It also includes reinforcing ribs 5; a plurality of reinforcing ribs 5 in a ring array are fixedly connected to the outer side of the connecting block 3001; the other end of each reinforcing rib 5 is fixedly connected to the lower side of the fixing ring 4.

[0034] Furthermore, in order to prevent the reinforcing ribs 5 from pushing up and squeezing the filter membrane 3 when being squeezed and deformed, thereby avoiding damage to the filter membrane 3, each reinforcing rib 5 is configured to be bent so that the reinforcing ribs 5 are uniformly bent in the horizontal direction when being squeezed and deformed.

[0035] It also includes a telescopic tube 6; the telescopic tube 6 is fixedly connected to the inner side of the tank body 1; the telescopic end of the telescopic tube 6 is fixedly connected to the telescopic end of the driving member 101; the telescopic tube 6 is provided with a plurality of through holes 6001 in a circular array; each through hole 6001 faces the middle of the filter membrane 3.

[0036] The present invention repeatedly raises and lowers the filter membrane 3 in the tank body 1, so that the excess carbon source particles in the lithium iron phosphate product pass through the filter membrane 3 and are adsorbed by the lithium iron phosphate to be coated, thereby solving the problem that the lithium iron phosphate product and the carbon source particles need to be separated later due to excess carbon source particles, which increases the workload of lithium iron phosphate carbon coating and reduces the utilization rate of carbon source particles. The specific process is as follows:

[0037] When using liquid phase deposition to carbon-coat lithium iron phosphate, a carbon source solution (organic compound solution such as glucose and sucrose) is first added to a reactor, and then lithium iron phosphate powder is added to the carbon source solution and stirred. During the stirring process, the carbon source solution is heated and the pH value of the carbon source solution is adjusted to acidic, so that the carbon source is precipitated from the carbon source solution. The precipitated carbon source adheres to the surface of the lithium iron phosphate powder when the temperature and pH value meet the standards to form a carbon coating layer, thereby completing the carbon coating of the lithium iron phosphate. When the carbon coating of the lithium iron phosphate is completed, the excess carbon source particles can no longer adhere to the surface of the lithium iron phosphate powder, resulting in an excess of carbon source particles.

[0038] When the lithium iron phosphate is carbon-coated in the reactor, the staff adds the lithium iron phosphate powder to be coated into the tank body 1 through the feeding pipe 1003. When the carbon coating of the lithium iron phosphate in the reactor is completed, the carbon source solution, the lithium iron phosphate product and the excess carbon source particles in the reactor are first discharged into the tank body 1 through the feeding pipe 1001. Since the particle size difference between the lithium iron phosphate product and the carbon source particles is large, the carbon source solution and some carbon source particles have a small particle size. After entering the tank body 1, they directly pass through the filter membrane 3 made of polytetrafluoroethylene material and come into contact with the lithium iron phosphate powder to be coated at the bottom of the tank body 1. The coated lithium iron phosphate product is intercepted by the filter membrane 3 due to its large particle size. The carbon source solution is continuously added to the tank body. 1, the filter membrane 3 gradually disappears from the interior, so that the filter membrane 3 is located in the middle of the carbon source solution. In the process of preliminary filtering of the lithium iron phosphate finished product and the carbon source particles, the filter membrane 3 is in a relaxed state. At this time, the heating plate 2 is controlled to heat up in the compartment 1005 to heat the carbon source solution in the tank body 1. At the same time, the DD motor 201 is controlled to drive the fixed frame 202 to rotate, so that the stirring paddle 203 stirs the lithium iron phosphate powder to be coated and the carbon source solution, so that the carbon source particles passing through the filter membrane 3 adhere to the surface of the lithium iron phosphate powder at the bottom of the tank body 1 when the temperature and pH value meet the standards, and adsorb the excess carbon source particles in the carbon source solution, so as to separate the lithium iron phosphate finished product and the excess carbon source particles, and improve the utilization rate of the carbon source particles.

[0039] It is also considered that the carbon source particles are blocked by the carbon-coated lithium iron phosphate and cannot completely pass through the filter membrane 3 to be adsorbed by the lithium iron phosphate powder at the bottom of the tank body 1. At this time, the telescopic end of the control driving member 101 is contracted to drive the fixing ring 4 and the filter membrane 3, which is initially in a concave state, to rise in the tank body 1. During this process, the filter membrane 3 is deformed from a relaxed state to a normal expanded state, and the filter membrane 3 is supported by the reinforcing ribs 5 to prevent the filter membrane 3 from being pulled and damaged during the lifting process, thereby enhancing the protection effect of the filter membrane 3. Since the connection point between the driving member 101 and the filter membrane 3 is located on the connecting block 3001, when the filter membrane 3 is pulled upward, the filter membrane 3, which is initially in a concave state, is deformed into an upward convex state, so that the lithium iron phosphate product accumulated in the middle of the upper side of the filter membrane 3 moves toward the outside of the filter membrane 3 together with the carbon source particles. During this process, the carbon source particles pass through the lithium iron phosphate product and pass through the filter membrane 3 together with the carbon source solution to contact the lithium iron phosphate powder at the bottom of the tank body 1, thereby enhancing the protection of the lithium iron phosphate. The separation effect of the lithium finished product and the carbon source particles improves the utilization rate of the carbon source particles. When the driving member 101 drives the fixing ring 4 and the filter membrane 3 to rise, the fixing ring 4 drives the block 302 to rise together. When the block 302 passes through the protrusion 303, the block 302 is squeezed into the movable groove 4001 by the protrusion 303 and compresses the elastic member 301. After the block 302 passes through the protrusion 303, under the elastic force of the elastic member 301, the block 302 is instantly ejected from the movable groove 4001, causing the fixing ring 4 to drive the filter membrane 3 to shake. When the lithium iron phosphate finished product and the carbon source particles move from the middle of the upper side of the filter membrane 3 toward the outer side of the filter membrane 3, it is beneficial to move the lithium iron phosphate finished product adhering to the middle of the upper side of the filter membrane 3 toward the outer side of the filter membrane 3, reduce the lithium iron phosphate finished product adhering to the middle of the upper side of the filter membrane 3, and enable the carbon source particles to pass through the filter membrane 3 and contact the lithium iron phosphate powder at the bottom of the tank body 1, thereby further enhancing the separation effect of the lithium iron phosphate finished product and the carbon source particles.

[0040] When the fixing ring 4 contacts the upper limit block 102 as the filter membrane 3 rises, the telescopic end of the control driving member 101 stops contracting, so that the filter membrane 3 and the fixing ring 4 stop rising, and then the telescopic end of the control driving member 101 extends to drive the filter membrane 3 and the fixing ring 4 to descend, so that the fixing ring 4 drives the block 302 to descend together. When the block 302 passes the protrusion 303, the protrusion 303 blocks the block 302, so that the fixing ring 4 stops descending, and the middle part of the filter membrane 3 continues to descend compared with the fixing ring 4, so that the filter membrane 3 in an upward convex state is deformed into a downward concave state, thereby causing the lithium iron phosphate product and the carbon source particles accumulated on the outside of the filter membrane 3 to move toward the middle of the upper side of the filter membrane 3. In this process, the carbon source particles pass through the lithium iron phosphate product, and as the carbon source solution passes through the filter membrane 3 again, it contacts the lithium iron phosphate powder at the bottom of the tank body 1, further enhancing the contact between the lithium iron phosphate product and the carbon source particles. Separation effect, when the connecting block 3001 descends to make the reinforcing rib 5 straight, the fixing ring 4 is pulled down through the reinforcing rib 5, so that the block 302 passes over the protrusion 303, and then the fixing ring 4 drives the filter membrane 3 to shake, thereby reducing the lithium iron phosphate product adhering to the outside of the filter membrane 3, enhancing the penetration effect of the carbon source particles from the outside of the filter membrane 3, and further enhancing the separation effect of the lithium iron phosphate product and the carbon source particles. When the fixing ring 4 contacts the lower limit block 103 as the filter membrane 3 descends, the telescopic end of the control drive member 101 stops extending, so that the filter membrane 3 and the fixing ring 4 stop descending, and prepare to perform the upward filtering work again. Through multiple lifting and lowering of the filter membrane 3, the carbon source particles in the lithium iron phosphate product on the upper side of the filter membrane 3 pass through the filter membrane 3 and contact the lithium iron phosphate powder at the bottom of the tank body 1, thereby realizing the separation of the lithium iron phosphate product and the excess carbon source particles, and improving the utilization rate of the carbon source particles.

[0041] When the driving member 101 drives the filter membrane 3 and the fixing ring 4 to descend, the telescopic end of the driving member 101 drives the telescopic tube 6 to move downward and stretch, so that the internal volume of the telescopic tube 6 increases, and the carbon source solution on the upper side of the filter membrane 3 is sucked into the telescopic tube 6 through the through hole 6001. When the driving member 101 drives the filter membrane 3 and the fixing ring 4 to rise, the telescopic end of the driving member 101 drives the telescopic tube 6 to move upward and shrink. At this time, the lithium iron phosphate product accumulated in the middle of the upper side of the filter membrane 3 moves toward the outside of the filter membrane 3 together with the carbon source particles, and the carbon source solution inside the telescopic tube 6 is sprayed out from the through hole 6001 through the contraction of the telescopic tube 6, and the lithium iron phosphate product adhered to the middle of the upper side of the filter membrane 3 is blown toward the outside of the filter membrane 3 together with the carbon source particles, thereby further reducing the lithium iron phosphate product adhered to the middle of the upper side of the filter membrane 3, so that the carbon source particles can pass through the filter membrane 3 and contact with the lithium iron phosphate powder at the bottom of the tank body 1, thereby further enhancing the separation effect of the lithium iron phosphate product and the carbon source particles.

[0042] When the carbon source particles in the carbon source solution are adsorbed by the lithium iron phosphate powder at the bottom of the tank body 1, the DD motor 201 is controlled to stop the stirring paddle 203 from mixing and stirring the lithium iron phosphate powder at the bottom of the tank body 1, and then the carbon source solution in the tank body 1 is discharged through the discharge pipe 1004, and the lithium iron phosphate product separated from the upper side of the filter membrane 3 and the carbon source particles is discharged through the discharge pipe 1002, completing the separation of the lithium iron phosphate product and the excess carbon source particles, while keeping the lithium iron phosphate powder at the bottom of the tank body 1 inside the tank body 1, preparing for the next adsorption of excess carbon source particles.

[0043] Example 2

[0044] On the basis of Example 1, Figure 2 , Figure 3 and Figure 6 As shown, a plurality of collecting grooves 4002 in a ring array are provided on the lower side of the fixing ring 4 .

[0045] It also includes a defoaming system, which includes a movable tube 401 and an exhaust pipe 402; a plurality of movable tubes 401 in a circular array are fixedly connected to the fixed ring 4; each movable tube 401 is connected to the corresponding collecting tank 4002; a plurality of exhaust pipes 402 in a circular array are fixedly connected to the inner wall of the tank body 1; each movable tube 401 is connected to the corresponding exhaust pipe 402 and is slidably connected.

[0046] Bristles 403 are also included; a plurality of bristles 403 in a circular array are fixedly connected to the upper side of the fixing frame 202 .

[0047] When the fixed frame 202 drives the stirring paddle 203 to rotate, so that the excess carbon source particles are adsorbed to the surface of the lithium iron phosphate powder at the bottom of the tank body 1, bubbles are generated in the carbon source solution during the stirring and mixing process and adhere to the lower side of the filter membrane 3, resulting in a reduction in the filtration area of ​​the filter membrane 3, a slowdown in the filtration rate of the carbon source particles, and a reduction in the filtration efficiency. The specific solution process is as follows:

[0048] During the process of stirring and mixing the lithium iron phosphate powder at the bottom of the tank body 1, when the middle part of the filter membrane 3 is in a downward concave state, the fixing frame 202 is close to the lower side of the filter membrane 3, so that the bristles 403 are attached to the lower side of the filter membrane 3, and the bristles 403 are driven by the fixing frame 202 to rotate, and the bubbles adhered to the lower side of the filter membrane 3 are brushed to a loose state, so that the bubbles move along the lower side of the filter membrane 3 toward the fixing ring 4 and enter the collecting tank 4002. The bubbles entering the collecting tank 4002 enter the exhaust pipe 402 through the movable tube 401 and are discharged to the upper part of the tank body 1, preventing the bubbles from adhering to the lower side of the filter membrane 3, avoiding the reduction of the filtering area of ​​the filter membrane 3, and improving the filtering efficiency of the carbon source particles.

[0049] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A lithium battery positive electrode material coating device, comprising a tank body (1) and a heating plate (2); a feed pipe (1001) is arranged on the tank body (1); a discharge pipe (1002) is arranged on the tank body (1); a feed pipe (1003) is arranged on the tank body (1); a discharge pipe (1004) is arranged on the tank body (1); a compartment (1005) is opened on the tank body (1); a heating plate (2) is arranged in the compartment (1005); the device is characterized in that: It also includes a movable component, a filter membrane (3), a fixing ring (4), a mixing component and a shaking component; the tank body (1) is connected to the movable component; the movable component is connected to a filter membrane (3) for filtering lithium iron phosphate products and a carbon source; a fixing ring (4) for fixing the filter membrane (3) is arranged outside the filter membrane (3); a connecting block (3001) is arranged on the filter membrane (3); a mixing component for mixing the carbon source and lithium iron phosphate is connected to the connecting block (3001); and a shaking component for deforming the filter membrane (3) is connected to the fixing ring (4); The movable assembly comprises a driving member (101), an upper limit block (102) and a lower limit block (103); the driving member (101) is fixedly connected to the upper side of the tank body (1); the telescopic end of the driving member (101) is fixedly connected to the connecting block (3001); a plurality of upper limit blocks (102) for blocking the fixing ring (4) from rising are fixedly connected to the inner side wall of the tank body (1); a plurality of lower limit blocks (103) for blocking the fixing ring (4) from falling are fixedly connected to the inner side wall of the tank body (1); the upper limit block (102) is located above the lower limit block (103); The mixing assembly comprises a DD motor (201), a fixing frame (202) and a stirring paddle (203); the connecting block (3001) is configured as a hollow structure; the DD motor (201) is fixedly connected inside the connecting block (3001); the output end of the DD motor (201) is fixedly connected to the fixing frame (202); and a plurality of stirring paddles (203) for mixing a carbon source and lithium iron phosphate are fixedly connected to the fixing frame (202); The shaking assembly comprises an elastic member (301), a clamping block (302) and a protrusion (303); a plurality of movable grooves (4001) are provided on the fixing ring (4); an elastic member (301) is fixedly connected in each movable groove (4001); a clamping block (302) is slidably connected in each movable groove (4001); each clamping block (302) is fixedly connected to a corresponding elastic member (301); and a plurality of protrusions (303) are fixedly connected to the inner wall of the tank body (1); It also includes reinforcing ribs (5); a plurality of reinforcing ribs (5) for supporting and reinforcing the filter membrane (3) are fixedly connected to the outer side of the connecting block (3001); the other end of each reinforcing rib (5) is fixedly connected to the lower side of the fixing ring (4); It also includes a telescopic tube (6); the telescopic tube (6) is fixedly connected to the inner side of the tank body (1); the telescopic end of the telescopic tube (6) is fixedly connected to the telescopic end of the driving member (101); a plurality of through holes (6001) are formed on the telescopic tube (6); each through hole (6001) faces the middle of the filter membrane (3).

2. A lithium battery positive electrode material coating device according to claim 1, characterized in that: Each reinforcing rib (5) is arranged in a bent state.

3. A lithium battery positive electrode material coating device according to claim 1, characterized in that: A plurality of collecting grooves (4002) for collecting bubbles are provided on the lower side of the fixing ring (4).

4. A lithium battery positive electrode material coating device according to claim 3, characterized in that: The tank body (1) further comprises a defoaming system, the defoaming system comprising a movable tube (401) and an exhaust pipe (402); a plurality of movable tubes (401) for transmitting bubbles are fixedly connected to the fixed ring (4); each movable tube (401) is connected to a corresponding collection tank (4002); a plurality of exhaust pipes (402) for exhausting bubbles are fixedly connected to the inner wall of the tank body (1); each movable tube (401) is connected to a corresponding exhaust pipe (402) and is slidably connected.

5. A lithium battery positive electrode material coating device according to claim 4, characterized in that: It also includes bristles (403); a plurality of bristles (403) are fixedly connected to the upper side of the fixing frame (202) and are used to clean bubbles adhering to the lower side of the filter membrane (3).

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