Device and method for wet separation of lithium iron phosphate battery

Abstract

The invention discloses a device for wet separation of lithium iron phosphate batteries in the field of lithium battery recovery devices, and the device comprises a separation cylinder which comprises a cylinder body and a cylinder cover detachably arranged on the cylinder body, the bottom of the separation cylinder is provided with a filter material port, and the bottom of the cylinder body is provided with a plurality of supporting legs for supporting; the stirring assembly is arranged in the barrel cover and is used for stirring the mixture in the separation barrel; the charging hopper is arranged on the barrel cover and is communicated with the interior of the barrel, a discharging opening in the bottom of the charging hopper is circularly opened and closed through an opening and closing assembly, and the opening and closing assembly is in transmission connection with the stirring assembly; the temperature control assembly is arranged on the separation barrel and is used for controlling the temperature in the separation barrel; and a separation method; the device has the beneficial effects that by arranging the stirring assembly and the reciprocating assembly and the opening and closing assembly which are in transmission connection with the stirring assembly, stirring and constant-speed feeding can be achieved at the same time, mixed particles can be effectively prevented from being accumulated at the bottom of the barrel, the dissolving efficiency is improved, and the dissolving effect is better through reciprocating stirring.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery recycling devices, and in particular to a device and method for wet separation of lithium iron phosphate batteries. Background Art

[0002] In recent years, with the vigorous development of the new energy industry, the power battery industry used in new energy vehicles has also developed rapidly. Lithium iron phosphate batteries are widely used in power batteries because they do not contain precious metals, have relatively low use costs, and are safe and stable. Therefore, when the era of large-scale scrapping of electric vehicles in my country comes, the recycling of lithium iron phosphate batteries will become very urgent.

[0003] With the widespread use of lithium-ion batteries, the number of discarded batteries is also increasing. If the graphite components in lithium-ion batteries are effectively recycled, the pollution to the environment can be reduced. Recycling graphite can reduce dependence on raw materials and ease the pressure on graphite mining. Graphite has many unique properties, such as excellent electron transmission capacity and large specific surface area, which makes it have potential application value in many fields. Graphite recovered from discarded lithium-ion batteries can be used to prepare high-value graphite products, such as a new generation of lithium-ion battery negative electrode materials.

[0004] The lithium, iron and other elements in lithium iron phosphate are precious resources. Recycling can reduce dependence on limited resources and reduce demand for original ore, thus saving resources. If discarded lithium iron phosphate batteries are not properly handled, they will pollute the environment. Recycling can reduce damage to the environment and avoid harmful substances in the battery from affecting the environment. By recycling lithium iron phosphate batteries, energy can be saved, because the production of new batteries consumes a lot of energy. Lithium iron phosphate recycling is in line with the concept of circular economy and helps promote the development of circular economy. By recycling discarded lithium iron phosphate batteries, sustainable use of resources can be promoted and pressure on the environment can be reduced.

[0005] The existing recycling technology is to violently disassemble the lithium iron phosphate battery. The problem caused by violent disassembly is that the two substances, graphite and lithium iron phosphate, are mixed together. After simple treatment, they become tiny graphite particles and lithium iron phosphate particles. The particle sizes of the two are similar and are not easy to separate.

[0006] There are two methods for separating lithium iron phosphate: wet separation and dry separation. In wet separation, crushed graphite and lithium iron phosphate particles are added to an acidic solution, and stirred sufficiently at a certain temperature to allow the lithium iron phosphate particles to react with the acidic solution and dissolve, while the graphite does not dissolve and remains solid. The separation of the lithium iron phosphate particles and the graphite particles is completed by filtering. The existing wet separation is carried out using existing stirring and separation devices, and most of the existing wet separation devices are carried out by adding materials first and then stirring. Adding materials first and then stirring is likely to cause particles to accumulate at the bottom, which leads to incomplete dissolution and further causes incomplete separation.

[0007] To this end, we propose a device and method for wet separation of lithium iron phosphate batteries. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, the present invention provides a device and method for wet separation of lithium iron phosphate batteries.

[0009] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0010] A device for wet separation of lithium iron phosphate batteries comprises: a separation cylinder, comprising a cylinder body and a cylinder cover detachably mounted on the cylinder body, a filter material port which can be opened and closed is provided at the bottom of the separation cylinder, and a plurality of supporting legs are provided at the bottom of the cylinder body for support; a stirring assembly is arranged in the cylinder cover and is used to stir the mixture in the separation cylinder; a feeding funnel is arranged on the cylinder cover and is connected to the cylinder body, a discharge port at the bottom of the feeding funnel is cyclically opened and closed by an opening and closing assembly, and the opening and closing assembly is transmission-connected to the stirring assembly; a temperature control assembly is arranged on the separation cylinder and is used to control the temperature in the separation cylinder.

[0011] By setting up a stirring component and realizing cyclic opening and closing of the feeding funnel through the opening and closing component, the opening and closing component and the stirring component are connected by transmission, so that the material can be added at a uniform speed during the stirring process, which can effectively reduce the risk of particles depositing at the bottom. The separation cylinder is heated by the temperature control component to keep it at a suitable temperature, which can accelerate the dissolution rate of the lithium iron phosphate particles and improve the separation efficiency.

[0012] It is further defined that the stirring assembly includes a stirring rod and a stirring motor, the output shaft of the stirring motor is connected to the stirring rod through the reciprocating assembly, and the stirring rod is caused to rotate reciprocally, the stirring motor is vertically fixed on the cylinder cover, and the output shaft extends into the cylinder cover; the stirring rod is caused to rotate reciprocally through the reciprocating assembly, and compared with stirring in the same direction all the time, by constantly changing the stirring direction, the interaction and collision opportunities between the mixed particles and the solution can be increased, the uniformity and dispersion of the mixing can be improved, the local accumulation of the mixed particles in the container can be avoided, and the mixed particles can be fully stirred in the entire stirring space.

[0013] It is further defined that the reciprocating assembly includes a turntable, a deflection shaft, a deflection guide bar, a fan-shaped gear and a reciprocating gear; the turntable is fixedly connected to the end of the output shaft of the stirring motor, the deflection shaft is vertically fixed to the edge of the turntable, the deflection guide bar is provided with a deflection guide groove along the length direction, the deflection guide bar is slidably connected to the deflection shaft through the deflection guide groove, the convergent end of the fan-shaped gear is fixedly connected to the end of the deflection guide bar, and the tooth surface is rotationally connected to the cylinder cover through a vertical axis, the reciprocating gear is also rotationally connected to the cylinder cover through a vertical axis, and the reciprocating gear and the fan-shaped gear are meshed, the stirring rod is fixedly connected to the center of the tooth surface of the reciprocating gear, and when the turntable rotates to the maximum deflection angle of the deflection guide bar, the edge of the fan-shaped gear is still meshed with the reciprocating gear.

[0014] The turntable is driven to rotate by the stirring motor, and when the turntable rotates, the deflection shaft position is deflected and moved, thereby driving the deflection guide bar and the fan gear to rotate around their vertical axis, thereby driving the reciprocating gear to rotate. The deflection shaft can only move in two directions in a cycle, so the reciprocating gear will also rotate back and forth, driving the stirring rod to rotate back and forth.

[0015] It is further defined that the feeding funnel includes a funnel section at the top and a straight cylinder section at the bottom, the feeding funnel is inserted into the cylinder cover and fixed through the straight cylinder section, and a closed door is horizontally inserted into the straight cylinder section outside the cylinder cover to realize manual opening and closing of the straight cylinder section; a closed door is provided to manually close the feeding funnel, so that the use of the device is more reasonable, and the mixture of lithium iron phosphate particles and graphite particles is restricted before use to prevent it from falling into the cylinder body before stirring begins and causing accumulation.

[0016] It is further defined that the opening and closing assembly includes an opening and closing turntable, a first pull shaft, a second pull shaft, an opening and closing pull rod and an opening and closing door; the opening and closing turntable is also connected to the cylinder cover through a vertical axis rotation, and the opening and closing turntable is meshed with a reciprocating gear, the first pull shaft is vertically fixed to the top disk edge of the opening and closing turntable, and the second pull shaft is vertically fixed to the bottom edge of the opening and closing door, and the two ends of the opening and closing pull rod are respectively rotatably connected to the first pull shaft and the second pull shaft, and when the turntable rotates to the maximum deflection angle of the deflection guide bar, the opening and closing door is in a fully open state; the reciprocating gear drives the opening and closing turntable to rotate reciprocatingly, and the opening and closing turntable drives the first pull shaft to displace during the rotation, while the length of the opening and closing pull rod is unchanged, which will drive the opening and closing door to displace, and open the opening and closing door. During the reciprocating rotation, the opening and closing door cyclically opens and closes, and when it is opened, the material is discharged, and when it is closed, the material discharge is stopped, and the stirring motor rotates at a uniform speed to achieve uniform interval and uniform speed discharge.

[0017] It is further defined that the cylinder includes an outer cylinder and an inner cylinder, there is a gap between the outer cylinder and the inner cylinder, the temperature control component includes a temperature control module and an electric heating wire, the temperature control module is fixed on the outer wall of the outer cylinder, the electric heating wire is evenly wound on the outer wall of the inner cylinder, and both ends pass through the cylinder wall of the outer cylinder to be electrically connected to the temperature control module; by winding the electric heating wire on the outer wall of the inner cylinder, the temperature control of the inner cylinder can be made more uniform, there is a gap between the inner cylinder and the outer cylinder, the temperature of the outer cylinder can be prevented from rising too much, the temperature is controlled by the temperature control module, so that the appropriate dissolution temperature is maintained in the inner cylinder, which can effectively improve the dissolution efficiency of lithium iron phosphate.

[0018] It is further defined that it also includes a lifting assembly, the lifting assembly includes a lifting seat, a lifting rod and a lifting ear, the lifting seat is fixedly arranged on the cylinder wall of the outer cylinder, the bottom of the lifting rod is fixedly arranged on the lifting seat, and the top is rotatably connected to the lifting ear, and the lifting ear is fixedly arranged on both sides of the cylinder cover; by setting the lifting assembly, the cylinder cover can be lifted, which is convenient for cleaning the inside of the cylinder body and maintaining the cylinder cover, and rotatably connecting the tops of the two lifting rods to the lifting ears can prevent the lifting assemblies on both sides from being damaged when errors occur in lifting after long-term use.

[0019] It is further defined that a cover plate is detachably provided inside the cylinder cover, the bottom end of the vertical shaft is rotatably connected to the cover plate, and a leakage hole is provided on the cover plate at a position corresponding to the straight cylinder section; a detachable cover plate is provided inside the cylinder cover, and the bottom end of the vertical shaft is rotatably connected to the cover plate, so that both ends of each vertical shaft through which various components are passed can serve as support, thereby improving the stability of the device.

[0020] It is further defined that the filter material port includes a filter cartridge, which is detachably connected to the bottom of the cylinder, and a filter screen and a closed valve plate are respectively arranged in the filter cartridge from top to bottom; by providing a detachable filter cartridge and a filter screen in the filter cartridge, the graphite particles can be first intercepted by the filter screen to discharge the solution, and after the solution is completely discharged, the filter cartridge can be removed to discharge the graphite particles to complete the separation.

[0021] A separation method, using the above-mentioned device for wet separation of lithium iron phosphate batteries, comprises the following steps:

[0022] S1: First, the cylinder cover is opened by the lifting assembly, and an acidic solution for dissolving lithium iron phosphate particles is added into the cylinder. After the acidic solution is added, the cylinder cover is lowered by the lifting assembly to seal the cylinder;

[0023] S2: manually closing the closed door of the feeding funnel, and adding a mixture of lithium iron phosphate and graphite particles into the feeding funnel;

[0024] S3: After the addition is completed, the stirring motor and the temperature control module are started, and the closed door of the feeding funnel is opened. During the operation of the stirring motor, the opening and closing door is cyclically opened and closed through the reciprocating rotation of the opening and closing turntable and the opening and closing pull rod, thereby controlling the mixture in the feeding funnel to be uniformly added into the cylinder, and the temperature control module starts the electric heating wire to heat it to a suitable dissolution temperature;

[0025] S4: After the mixture in the cylinder is fully stirred and the lithium iron phosphate particles are fully dissolved in the acidic solution, the closed valve plate of the filter material port is opened to filter out the solution, and the stirring motor is kept in the started state at this time, and the graphite particles are retained in the cylinder;

[0026] S5: After the solution is completely discharged, the filter cartridge is disassembled and the graphite particles are discharged, thereby completing the separation of the lithium iron phosphate particles and the graphite particles.

[0027] The beneficial effects of the present invention are as follows: by providing a stirring component and a reciprocating component and an opening and closing component that are transmission-connected to the stirring component, it is possible to add materials at a uniform speed while stirring, which can effectively prevent the accumulation of mixed particles at the bottom of the cylinder, improve the dissolution efficiency, and the reciprocating stirring makes the dissolution effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the cylinder cover from a frontal perspective;

[0030] Figure 3 It is a schematic diagram of the internal structure of the cylinder;

[0031] Figure 4 A bottom view of the opening and closing component and the reciprocating component;

[0032] Figure 5 for Figure 3 Enlarged schematic diagram of part A.

[0033] The symbols of the components are as follows:

[0034] Separation cylinder 1, cylinder cover 11, cover plate 111, cylinder body 12, outer cylinder 121, inner cylinder 122, filter material port 13, filter cylinder 131, filter screen 132, closed valve plate 133, support leg 134, stirring component 2, stirring rod 21, stirring motor 22, feeding funnel 3, funnel section 31, straight cylinder section 32, closed door 33, temperature control component 4, temperature control module 41, electric heating wire 42, opening and closing component 5, opening and closing turntable 51, first pull shaft 52, second pull shaft 53, opening and closing pull rod 54, opening and closing door 55, reciprocating component 6, turntable 61, deflection shaft 62, deflection guide bar 63, deflection guide groove 631, fan gear 64, reciprocating gear 65, lifting component 7, lifting seat 71, lifting rod 72, lifting ear 73. DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0036] Example:

[0037] like Figure 1-Figure 5As shown, a device for wet separation of lithium iron phosphate batteries includes a separation cylinder 1, a stirring assembly 2, a feeding funnel 3, a temperature control assembly 4, an opening and closing assembly 5, a reciprocating assembly 6 and a lifting assembly 7; the separation cylinder 1 includes a cylinder body 12 and a cylinder cover 11 detachably arranged on the cylinder body 12, a filter material port 13 that can be opened and closed is provided at the bottom of the separation cylinder 1, the filter material port 13 includes a filter cylinder 131, the filter cylinder 131 is detachably connected to the bottom of the cylinder body 12, and a filter screen 132 and a closed valve plate 133 are respectively arranged in the filter cylinder 131 from top to bottom; a plurality of supporting legs 134 for support are provided at the bottom of the cylinder body 12; the cylinder body 12 includes an outer cylinder 121 and an inner cylinder 122, and there is a gap between the outer cylinder 121 and the inner cylinder 122; the stirring assembly 2 is used to The mixture is stirred; the stirring assembly 2 includes a stirring rod 21 and a stirring motor 22, the output shaft of the stirring motor 22 is connected to the stirring rod 21 through a reciprocating assembly 6, and the stirring rod 21 is reciprocated, the stirring motor 22 is vertically fixed on the cylinder cover 11, and the output shaft extends into the cylinder cover 11; the reciprocating assembly 6 includes a turntable 61, a deflection shaft 62, a deflection guide bar 63, a sector gear 64 and a reciprocating gear 65; the turntable 61 is fixedly connected to the output shaft end of the stirring motor 22, the deflection shaft 62 is vertically fixed to the edge of the disk surface of the turntable 61, the deflection guide bar 63 is provided with a deflection guide groove 631 along the length direction, the deflection guide bar 63 is slidably connected to the deflection shaft 62 through the deflection guide groove 631, and the convergence end of the sector gear 64 is fixed The rotating disk 61 is fixedly connected to the end of the deflection guide bar 63, and the tooth surface is rotatably connected to the cylinder cover 11 through a vertical axis. The reciprocating gear 65 is also rotatably connected to the cylinder cover 11 through a vertical axis, and the reciprocating gear 65 is meshed with the fan gear 64. The stirring rod 21 is fixedly connected to the center of the tooth surface of the reciprocating gear 65. When the turntable 61 rotates to the point where the deflection guide bar 63 is at the maximum deflection angle, the edge of the fan gear 64 is still meshed with the reciprocating gear 65. The feeding funnel 3 is arranged on the cylinder cover 11 and is connected to the cylinder body 12. The bottom discharge port of the feeding funnel 3 is cyclically opened and closed by the opening and closing component 5, and the opening and closing component 5 is transmission-connected to the stirring component 2. The feeding funnel 3 includes a funnel section 31 at the top and a straight cylinder section 32 at the bottom. The feeding funnel 3 is inserted into the cylinder body 12 through the straight cylinder section 32. The cylinder section 32 is fixed in the cylinder cover 11, and a closed door 33 is horizontally inserted into the straight cylinder section 32 outside the cylinder cover 11 to realize manual opening and closing of the straight cylinder section 32; the opening and closing assembly 5 includes an opening and closing turntable 51, a first pull shaft 52, a second pull shaft 53, an opening and closing pull rod 54 and an opening and closing door 55; the opening and closing turntable 51 is also connected to the cylinder cover 11 through a vertical axis rotation, and the opening and closing turntable 51 is meshed with a reciprocating gear 65, the first pull shaft 52 is vertically fixed to the top disk edge of the opening and closing turntable 51, and the second pull shaft 53 is vertically fixed to the bottom edge of the opening and closing door 55, and the two ends of the opening and closing pull rod 54 are respectively rotatably connected to the first pull shaft 52 and the second pull shaft 53, and when the turntable 61 rotates to the maximum deflection angle of the deflection guide bar 63, the opening and closing door 55 is fully opened;A cover plate 111 is detachably provided in the cylinder cover 11, and the bottom end of the vertical shaft is rotatably connected to the cover plate 111. A leakage hole is provided on the cover plate 111 at a position corresponding to the straight cylinder section 32; the temperature control component 4 is used to control the temperature in the separation cylinder 1, and the temperature control component 4 includes a temperature control module 41 and an electric heating wire 42. The temperature control module 41 is fixedly arranged on the outer wall of the outer cylinder 121, and the electric heating wire 42 is evenly wound on the outer wall of the inner cylinder 122, and both ends pass through the cylinder wall of the outer cylinder 121 and are electrically connected to the temperature control module 41. ; The lifting assembly 7 includes a lifting seat 71, a lifting rod 72 and a lifting ear 73. The lifting seat 71 is fixed on the wall of the outer cylinder 121. The bottom of the lifting rod 72 is fixed on the lifting seat 71 and the top is rotatably connected to the lifting ear 73. The lifting ear 73 is fixed on both sides of the cylinder cover 11. The temperature control module 41 includes a DHT11 digital temperature and humidity sensor, an STM32F103C8T6 single chip microcomputer and a conventional conversion circuit, wherein the sensing end of the temperature and humidity sensor is in contact with the inner cylinder 122. ;

[0038] By setting a stirring component 2, and realizing cyclic opening and closing of the feeding funnel 3 through the opening and closing component 5, the opening and closing component 5 and the stirring component 2 are connected in transmission, so that the material can be added at a uniform speed during the stirring process, which can effectively reduce the risk of particles depositing at the bottom, and the separation cylinder 1 is heated by the temperature control component 4 to keep it at a suitable temperature, which can accelerate the dissolution rate of the lithium iron phosphate particles and improve the separation efficiency; the stirring rod 21 is made to reciprocate by the reciprocating component 6. Compared with stirring in the same direction all the time, by constantly changing the stirring direction, the interaction and collision opportunities between the mixed particles and the solution can be increased, the uniformity and dispersion of the mixing can be improved, and the local accumulation of the mixed particles in the container can be avoided, so that the mixed particles are stirred throughout the whole stirring process. The stirring motor 22 rotates to drive the turntable 61 to rotate, and the rotation of the turntable 61 drives the deflection shaft 62 to deflect and move, thereby driving the deflection guide bar 63 and the fan gear 64 to rotate around their vertical axis, thereby driving the reciprocating gear 65 to rotate. The deflection of the deflection shaft 62 only moves in two directions in a cycle, so the reciprocating gear 65 will also reciprocate, driving the stirring rod 21 to reciprocate; a closed door 33 is set to manually close the feeding funnel 3, so that the use of the device is more reasonable. Before use, the mixture of lithium iron phosphate particles and graphite particles is restricted to prevent it from falling into the cylinder 12 before stirring begins, causing accumulation; the reciprocating gear 65 reciprocates to drive the opening and closing turntable 51 to The opening and closing turntable 51 drives the first pull shaft 52 to move during the rotation, and the length of the opening and closing pull rod 54 is unchanged, which will drive the opening and closing door 55 to move, and open the opening and closing door 55. During the reciprocating rotation, the opening and closing door 55 cyclically opens and closes, and the material is discharged when it is opened, and the material is stopped when it is closed. The stirring motor 22 rotates at a uniform speed to achieve uniform interval and uniform speed discharge; by winding the electric heating wire 42 on the outer wall of the inner cylinder 122, the temperature control of the inner cylinder 122 can be more uniform, and there is a gap between the inner cylinder 122 and the outer cylinder 121, which can prevent the temperature of the outer cylinder 121 from rising too much. The temperature is controlled by the temperature control module 41, so that the inner cylinder 122 maintains a suitable dissolution temperature, which can effectively improve the dissolution efficiency of lithium iron phosphate; by setting The lifting assembly 7 is arranged to lift the cylinder cover 11, which is convenient for cleaning the inside of the cylinder body 12 and maintaining the cylinder cover 11. The tops of the two lifting rods 72 are rotatably connected to the lifting ears 73 to prevent the lifting assemblies 7 on both sides from damaging the components when errors occur in the lifting after long-term use; a detachable cover plate 111 is arranged in the cylinder cover 11, and the bottom end of the vertical axis is rotatably connected to the cover plate 111, so that both ends of the vertical axes through which various components are passed can serve as supports, which can improve the stability of the device; by arranging a detachable filter cartridge 131 and arranging a filter screen 132 in the filter cartridge 131, the graphite particles can be intercepted and discharged from the solution through the filter screen 132, and after the solution is completely discharged, the filter cartridge 131 is removed to discharge the graphite particles and complete the separation.

[0039] A separation method, using the above-mentioned device for wet separation of lithium iron phosphate batteries, comprises the following steps:

[0040] S1: firstly, the cylinder cover 11 is opened by the lifting assembly 7, and an acidic solution for dissolving lithium iron phosphate particles is added into the cylinder body 12. After the acidic solution is added, the cylinder cover 11 is lowered by the lifting assembly 7 to seal the cylinder body 12;

[0041] S2: manually closing the closed door 33 of the feeding funnel 3, and adding a mixture of lithium iron phosphate and graphite particles into the feeding funnel 3;

[0042] S3: After the feeding is completed, the stirring motor 22 and the temperature control module 41 are started, and the closed door 33 of the feeding funnel 3 is opened. During the operation of the stirring motor 22, the opening and closing door 55 is cyclically opened and closed through the reciprocating rotation of the opening and closing turntable 51 and the opening and closing pull rod 54, thereby controlling the mixture in the feeding funnel 3 to be uniformly added to the cylinder 12, and the temperature control module 41 starts the electric heating wire 42 to heat it to a suitable dissolution temperature;

[0043] S4: After the mixture in the cylinder 12 is stirred sufficiently and the lithium iron phosphate particles are fully dissolved in the acidic solution, the closed valve plate 133 of the filter material port 13 is opened to filter out the solution, and the stirring motor 22 is kept in the started state at this time, and the graphite particles are retained in the cylinder 12;

[0044] S5: After the solution is completely discharged, the filter cartridge 131 is disassembled to discharge the graphite particles, thereby completing the separation of the lithium iron phosphate particles and the graphite particles.

Claims

1. A device for wet separation of lithium iron phosphate batteries, characterized in that: include: A separation cylinder (1) comprises a cylinder body (12) and a cylinder cover (11) detachably mounted on the cylinder body (12); a filter material port (13) which can be opened and closed is provided at the bottom of the separation cylinder (1); and a plurality of supporting legs (134) for supporting are provided at the bottom of the cylinder body (12); A stirring assembly (2) is disposed in the cylinder cover (11) and is used to stir the mixture in the separation cylinder (1); A feeding funnel (3) is arranged on the cylinder cover (11) and is in communication with the cylinder body (12); a bottom discharge port of the feeding funnel (3) is cyclically opened and closed by an opening and closing assembly (5), and the opening and closing assembly (5) is transmission-connected to the stirring assembly (2); A temperature control component (4) is arranged on the separation cylinder (1) and controls the temperature inside the separation cylinder (1).

2. The device for wet separation of lithium iron phosphate batteries according to claim 1, characterized in that: The stirring assembly (2) comprises a stirring rod (21) and a stirring motor (22); the output shaft of the stirring motor (22) is connected to the stirring rod (21) through a reciprocating assembly (6) and enables the stirring rod (21) to reciprocate; the stirring motor (22) is vertically fixed on the cylinder cover (11), and the output shaft extends into the cylinder cover (11).

3. The device for wet separation of lithium iron phosphate batteries according to claim 2, characterized in that: The reciprocating assembly (6) comprises a rotating disk (61), a deflection shaft (62), a deflection guide bar (63), a sector gear (64) and a reciprocating gear (65); the rotating disk (61) is fixedly connected to the output shaft end of the stirring motor (22); the deflection shaft (62) is vertically fixedly arranged on the edge of the rotating disk (61); the deflection guide bar (63) is provided with a deflection guide groove (631) along the length direction; the deflection guide bar (63) is slidably connected to the deflection shaft (62) through the deflection guide groove (631); the sector gear (64) The convergent end is fixedly connected to the end of the deflection guide bar (63), and the tooth surface is rotatably connected to the cylinder cover (11) via a vertical axis. The reciprocating gear (65) is also rotatably connected to the cylinder cover (11) via a vertical axis, and the reciprocating gear (65) and the fan-shaped gear (64) are meshed. The stirring rod (21) is fixedly connected to the center of the tooth surface of the reciprocating gear (65). When the turntable (61) rotates to the point where the deflection guide bar (63) is at the maximum deflection angle, the edge of the fan-shaped gear (64) is still meshed with the reciprocating gear (65).

4. The device for wet separation of lithium iron phosphate batteries according to claim 3, characterized in that: The feeding funnel (3) comprises a funnel section (31) at the top and a straight tube section (32) at the bottom. The feeding funnel (3) is inserted into the cylinder cover (11) and fixed via the straight tube section (32). A closed door (33) is horizontally inserted into the straight tube section (32) outside the cylinder cover (11) to realize manual opening and closing of the straight tube section (32).

5. The device for wet separation of lithium iron phosphate batteries according to claim 4, characterized in that: The opening and closing assembly (5) comprises an opening and closing rotating disk (51), a first pull shaft (52), a second pull shaft (53), an opening and closing pull rod (54) and an opening and closing door (55); the opening and closing rotating disk (51) is also connected to the cylinder cover (11) by a vertical axis rotation, and the opening and closing rotating disk (51) and the reciprocating gear (65) are meshed, the first pull shaft (52) is vertically fixed on the top disk edge of the opening and closing rotating disk (51), the second pull shaft (53) is vertically fixed on the bottom edge of the opening and closing door (55), and the two ends of the opening and closing pull rod (54) are respectively connected to the first pull shaft (52) and the second pull shaft (53) by rotation, and when the rotating disk (61) is rotated until the deflection guide bar (63) is at the maximum deflection angle, the opening and closing door (55) is in a fully open state.

6. The device for wet separation of lithium iron phosphate batteries according to claim 5, characterized in that: The cylinder (12) comprises an outer cylinder (121) and an inner cylinder (122), and a gap exists between the outer cylinder (121) and the inner cylinder (122). The temperature control component (4) comprises a temperature control module (41) and an electric heating wire (42), and the temperature control module (41) is fixedly arranged on the outer wall of the outer cylinder (121). The electric heating wire (42) is evenly wound on the outer wall of the inner cylinder (122), and two ends of the electric heating wire pass through the cylinder wall of the outer cylinder (121) to be electrically connected to the temperature control module (41).

7. The device for wet separation of lithium iron phosphate batteries according to claim 6, characterized in that: The invention also comprises a lifting assembly (7), wherein the lifting assembly (7) comprises a lifting seat (71), a lifting rod (72) and a lifting ear (73); the lifting seat (71) is fixedly arranged on the cylinder wall of the outer cylinder (121); the bottom of the lifting rod (72) is fixedly arranged on the lifting seat (71) and the top is rotatably connected to the lifting ear (73); and the lifting ear (73) is fixedly arranged on both sides of the cylinder cover (11).

8. The device for wet separation of lithium iron phosphate batteries according to claim 7, characterized in that: A cover plate (111) is detachably provided inside the cylinder cover (11), the bottom end of the vertical shaft is rotatably connected to the cover plate (111), and a material leakage hole is provided on the cover plate (111) at a position corresponding to the straight cylinder section (32).

9. The device for wet separation of lithium iron phosphate batteries according to claim 8, characterized in that: The filter material port (13) comprises a filter cartridge (131), the filter cartridge (131) being detachably connected to the bottom of the cylinder body (12), and a filter screen (132) and a closed valve plate (133) being respectively arranged in the filter cartridge (131) from top to bottom.

10. A separation method, using the device for wet separation of lithium iron phosphate batteries according to claim 9, characterized in that: The steps include: S1: first, the cylinder cover (11) is opened by the lifting assembly (7), and an acidic solution for dissolving lithium iron phosphate particles is added into the cylinder body (12). After the acidic solution is added, the cylinder cover (11) is lowered by the lifting assembly (7) to seal the cylinder body (12); S2: manually closing the sealing door (33) of the feeding funnel (3), and adding a mixture of lithium iron phosphate and graphite particles into the feeding funnel (3); S3: After the addition is completed, the stirring motor (22) and the temperature control module (41) are started, and the closed door (33) of the feeding funnel (3) is opened. During the operation of the stirring motor (22), the opening and closing door (55) is cyclically opened and closed through the reciprocating rotation of the opening and closing turntable (51) and the opening and closing pull rod (54), thereby controlling the mixture in the feeding funnel (3) to be uniformly added to the cylinder (12), and the temperature control module (41) starts the electric heating wire (42) to heat it to a suitable dissolving temperature; S4: After the mixture in the cylinder (12) is sufficiently stirred and the lithium iron phosphate particles are sufficiently dissolved in the acidic solution, the closed valve plate (133) of the filter material port (13) is opened to filter out the solution, and the stirring motor (22) is kept in the started state at this time, and the graphite particles are retained in the cylinder (12); S5: After the solution is completely discharged, the filter cartridge (131) is disassembled to discharge the graphite particles, thereby completing the separation of the lithium iron phosphate particles and the graphite particles.

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