Separation system and production line for aluminum foil and positive electrode material in positive electrode plate of lithium iron phosphate battery

Abstract

The utility model discloses a separation system and a production line for an aluminum foil and a positive electrode material in a positive electrode plate of a lithium iron phosphate battery, and relates to the technical field of batteries. Comprising a first feeding unit used for conveying lithium iron phosphate battery positive plates, slicing equipment used for cutting the lithium iron phosphate battery positive plates into materials, and a first mesh belt machine used for conveying the materials soaked in a water tank; the drying equipment is used for drying mixed materials obtained after passing through the water tank, the screening equipment is used for screening the dried mixed materials, heavy liquid is added into the containing tank, a positive electrode material outlet is formed in one end of the containing tank, and an aluminum foil outlet is formed in the other end of the containing tank. According to the utility model, the aluminum foil and the positive electrode material in the lithium iron phosphate positive electrode plate can be efficiently separated, so that the aluminum content in the separated positive electrode material is less than 60ppm, and the positive electrode material and the aluminum foil in the lithium iron phosphate positive electrode plate can be industrially produced and recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a separation system and a production line for aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery. Background Art

[0002] Lithium iron phosphate battery refers to a lithium-ion battery with lithium iron phosphate as the positive electrode material. The positive electrode of the lithium iron phosphate battery is lithium iron phosphate coated on aluminum foil, and the aluminum foil can act as the positive electrode current collector in the lithium battery. The current collector plays the role of carrying active substances, collecting the electrons generated by the electrochemical reaction and conducting them to the external circuit, thereby realizing the process of converting chemical energy into electrical energy. Due to the rapid development of the new energy industry, the production and use of lithium ions have increased year by year. The efficient recycling of waste lithium iron phosphate batteries and scraps in the battery production process has become an indispensable research content in realizing the recycling of materials.

[0003] Among some related technologies, the current recycling methods for lithium iron phosphate positive electrode sheets mainly include calcination screening method, alkaline leaching method, solvent leaching method and dry-wet mixed physical recovery method, but most of them are in the laboratory stage and use high-concentration strong alkaline solution, which is not only costly, but also aluminum and lithium are dissolved in the alkaline solution, and valuable elements are lost, making the separation efficiency of real aluminum foil low. When the electrode is immersed in a strong alkaline solution, the reaction is violent and a large amount of hydrogen is produced, which is even more difficult to achieve industrial production.

[0004] In addition, in some related technologies, the active material containing aluminum foil and positive electrode material is crushed for separation. The aluminum foil will be crushed at the same time during the crushing, making it more difficult to separate from the positive electrode material. As a result, the final positive electrode material will be mixed with a large amount of aluminum, and the aluminum foil and the positive electrode material may still be doped. Utility Model Content

[0005] In order to solve at least one of the problems mentioned in the above background technology, the utility model provides a separation system and production line for aluminum foil and positive electrode material in lithium iron phosphate battery positive electrode sheets, which can realize efficient separation of aluminum foil and positive electrode material in lithium iron phosphate positive electrode sheets, so that the aluminum content in the separated positive electrode material is below 60ppm, and can realize industrial production and recovery of positive electrode material and aluminum foil in lithium iron phosphate positive electrode sheets.

[0006] The specific technical solutions provided by the embodiments of the present utility model are as follows:

[0007] In a first aspect, a system for separating aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery is provided, comprising:

[0008] The first loading unit is used to transport the positive electrode sheet of lithium iron phosphate battery;

[0009] A slicing device, connected to the outlet end of the first feeding unit, for cutting the lithium iron phosphate battery positive electrode sheet into materials of a preset size;

[0010] A water tank, the water tank is used to soak the material, a first mesh belt machine is installed in the water tank, the first mesh belt machine is arranged at the bottom of the water tank, and the first mesh belt machine is used to convey the material;

[0011] A drying device and a screening device, wherein the drying device is used to dry the mixed material obtained after passing through the water tank, and the inlet end of the screening device is connected to the outlet end of the drying device to screen the dried mixed material to obtain the material on the screen;

[0012] A holding tank is provided, wherein a heavy liquid is added into the holding tank, and a positive electrode material outlet is provided at one end of the holding tank, and an aluminum foil outlet is provided at the other end.

[0013] In a specific embodiment, a heating device, a bubbler and an agitator are provided in the water tank. The heating device is provided on the upper part of the first mesh belt machine. The bubbler includes a plurality of air outlets, which output compressed air into the water tank. The agitator is used to stir the liquid in the water tank.

[0014] In a specific embodiment, the first loading unit includes a conveying channel and a feeding trough installed at the inlet end of the conveying channel. The conveying channel is provided with a discharge port, and the discharge port corresponds to the inlet end of the slicing device.

[0015] In a specific embodiment, it also includes a second loading unit, which is connected between the slicing device and the water tank, and the second loading unit is used to transport the cut materials to the water tank.

[0016] In a specific embodiment, the positive electrode material outlet is arranged near the bottom of the containing tank, and the aluminum foil outlet is arranged near the surface of the heavy liquid.

[0017] In a specific embodiment, it also includes a first screw feeder and a feeding bin installed on the first screw feeder, the feeding bin corresponds to the outlet end of the first mesh belt machine, and transports the material from the first mesh belt machine to the first screw feeder, and the outlet end of the first screw feeder is connected to the drying equipment.

[0018] In a specific embodiment, it also includes a first drying device and a second drying device, wherein the first drying device is connected to the aluminum foil outlet and is used to dry the aluminum foil collected on the liquid surface in the receiving tank, and the second drying device is connected to the positive electrode material outlet and is used to dry the positive electrode material collected in the receiving tank.

[0019] In a specific embodiment, it further includes a second screw feeder and a third screw feeder, wherein the second screw feeder is connected between the receiving tank and the first drying device, and the third screw feeder is connected between the receiving tank and the second drying device.

[0020] In a specific embodiment, at least two condensation recovery devices are further included, wherein one of the condensation recovery devices is installed on the first drying equipment, and the other of the condensation recovery devices is installed on the second drying equipment.

[0021] In a second aspect, a production line is provided, which includes the separation system of the aluminum foil and the positive electrode material in the positive electrode sheet of the lithium iron phosphate battery as described above.

[0022] The embodiments of the present utility model have the following beneficial effects:

[0023] 1. The solution provided in the embodiment of the utility model can realize the efficient separation of aluminum foil and positive electrode material in lithium iron phosphate positive electrode sheets, so that the aluminum content in the positive electrode material after separation is below 60 ppm, and can realize industrial production and recovery of positive electrode materials and aluminum foil in lithium iron phosphate positive electrode sheets.

[0024] 2. A heating device, a bubbler and an agitator are set in the water tank. The water in the water tank is heated and stirred for a certain period of time. At the same time, compressed air is introduced into the water tank to further improve the separation effect of the aluminum foil and the positive electrode material in the water. The separation rate of the aluminum foil and the positive electrode material in this embodiment reaches more than 99.5%.

[0025] 3. In this embodiment, by drying and screening the mixed material after immersion, the presence of glue can be greatly reduced, so that the aluminum wire and aluminum chips can be removed as much as possible, and at the same time, the aluminum wire and aluminum chips are prevented from floating on the heavy liquid due to their small particle size. The heavy liquid is used as a medium for further separation of the aluminum foil and the positive electrode material, so that the aluminum content in the positive electrode material after final separation is below 60ppm. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram showing a portion of a system for separating aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery according to the present application;

[0028] Figure 2 Another partial schematic diagram showing the separation system of the aluminum foil and the positive electrode material in the positive electrode sheet of a lithium iron phosphate battery according to the present application;

[0029] In the figure, 1. first loading unit; 101. conveying channel; 102. feeding trough; 103. supporting frame; 2. slicing equipment; 3. second loading unit; 4. water tank; 401. feeding channel; 402. first mesh belt conveyor; 5. drying equipment; 6. screening equipment; 7. containing tank; 701. positive electrode material outlet; 702. aluminum foil outlet; 8. heating device; 9. bubbler; 10. agitator; 11. first screw feeder; 12. feeding bin; 13. second screw feeder; 14. third screw feeder; 15. first drying equipment; 16. second drying equipment; 17. condensation recovery device; 18. second mesh belt conveyor; 19. discharge trough. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Embodiment 1

[0032] A separation system of aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery, such as Figure 1 and Figure 2 As shown, it includes a first feeding unit 1, a slicing device 2, a second feeding unit 3, a water tank 4, a drying device 5, a screening device 6 and a receiving tank 7. Among them, the first feeding unit 1 is used to convey the positive electrode sheet of the lithium iron phosphate battery to the slicing device 2, and the slicing device 2 is arranged at the output end of the first feeding unit 1, and is used to cut the positive electrode sheet of the lithium iron phosphate battery from the first feeding unit 1 into materials of a preset size. The second feeding unit 3 is connected between the slicing device 2 and the water tank 4. The structure of the second feeding unit 3 is the same as or different from that of the first feeding unit 1. In this embodiment, the second feeding unit 3 has the same structure as the first feeding unit 1, and the second feeding unit 3 is used to convey the cut material to the water tank 4.

[0033] In a specific embodiment, the material of a preset size is a quadrilateral with a first side length and a second side length of 8 cm to 5 cm. By cutting the material into the preset size, the aluminum wire and aluminum chips brought about in the process of cutting into a smaller size can be reduced, while ensuring that the positive electrode material and the aluminum foil are not folded when immersed in water, resulting in the positive electrode material and the aluminum foil being difficult to separate, so that in the subsequent screening process, most of the aluminum foil is in the material on the screen, reducing the loss rate of the aluminum foil.

[0034] The water tank 4 includes a feed channel 401, which is vertically arranged on one side of the water tank 4 close to the second feeding unit 3, and the feed channel 401 corresponds to the outlet end of the second feeding unit 3, so that the material conveyed by the second feeding unit 3 enters the water tank 4 through the feed channel 401. Clean water for soaking the material is added to the water tank 4, and a first mesh belt machine 402 is installed at the bottom of the water tank 4. The first mesh belt machine 402 is transmission-arranged at the bottom of the water tank 4, and the first mesh belt machine 402 runs through the feed channel 401, the water tank 4 and the outlet end of the water tank 4, so as to convey the material in the water tank 4.

[0035] The drying device 5 is used to dry the mixed material obtained after passing through the water tank 4. The inlet end of the screening device 6 is connected to the outlet end of the drying device 5 to screen the dried mixed material to obtain the material on the screen. A heavy liquid is added to the containing tank 7, and the density of the heavy liquid is greater than the density of aluminum. A positive electrode material outlet 701 is provided at one end of the containing tank 7, and an aluminum foil outlet 702 is provided at the other end. The aluminum foil and the positive electrode material in the containing tank 7 are further separated by the heavy liquid, and the separated aluminum foil and positive electrode material are obtained from the outlets at both ends of the containing tank 7 respectively.

[0036] In a specific embodiment, the screening device 6 in this embodiment includes but is not limited to a linear vibrating screen, and the discharge port of the linear vibrating screen corresponds to the containing tank 7.

[0037] In order to further improve the separation effect of the aluminum foil and the positive electrode material in the water tank 4, a heating device 8, a bubbler 9 and an agitator 10 are arranged in the water tank 4. Several heating devices 8 are arranged in the water tank 4 at intervals. In this embodiment, four heating devices 8 are arranged and evenly distributed along the length direction of the water tank 4. The heating device 8 is located at the upper part of the first mesh belt machine 402 and is arranged at a middle position close to the height of the liquid in the water tank 4 to achieve uniform heating of the liquid in the water tank 4. Three bubblers 9 are arranged in the water tank 4, and each bubbler 9 includes a plurality of air outlets, and the air outlets output compressed air into the water tank 4. The agitator 10 is used to stir the liquid in the water tank 4 so that the flowing liquid is separated by the friction between the liquid and the aluminum foil and the positive electrode material. Several agitators 10 are arranged in the water tank 4. In this embodiment, three agitators 10 are arranged in the water tank 4, and the three agitators 10 are arranged at the same depth in the water tank 4.

[0038] In a specific embodiment, the depths of the plurality of stirrers 10 below the liquid surface in the water tank 4 gradually become deeper or the depths of the plurality of stirrers 10 below the liquid surface in the water tank 4 are the same.

[0039] like Figure 1 As shown, the first loading unit 1 includes a conveying channel 101 and a feeding trough 102. A support frame 103 is provided at the lower part of the conveying channel 101. The support frame 103 is supported and arranged at the lower part of the conveying channel 101 so that the conveying channel 101 is inclined, that is, the bottom end of the conveying channel 101 is connected to the feeding trough 102. The feeding trough 102 is installed at the inlet end of the conveying channel 101. The conveying channel 101 is provided with a discharge port, and the discharge port corresponds to the inlet end of the slicing device 2. The structure of the second loading unit 3 in this embodiment is the same as that of the first loading unit 1. The structure of the second loading unit 3 refers to the structure of the first loading unit 1. The second loading unit 3 is used to feed the material cut by the slicing device 2 to the water trough 4.

[0040] In a specific embodiment, the conveying channel 101 in this embodiment includes but is not limited to being configured as a feeding belt magnetic roller conveyor to achieve the removal of magnetic substances in the material.

[0041] like Figure 1As shown, in a specific embodiment, it also includes a first screw feeder 11 and a feeding bin 12 installed on the first screw feeder 11, the feeding bin 12 corresponds to the outlet end of the first mesh belt machine 402, and conveys the material from the first mesh belt machine 402 to the first screw feeder 11, and the outlet end of the first screw feeder 11 is connected to the drying device 5. The feeding bin 12 is vertically hollow, and the feeding bin 12 is vertically installed at one end of the first screw feeder 11, and the other end of the first screw feeder 11 is connected to the drying device 5, so as to convey the material of the first mesh belt machine 402 to the drying device 5.

[0042] like Figure 2 As shown, the system further includes a second screw feeder 13, a third screw feeder 14, a first drying device 15 and a second drying device 16, wherein the second screw feeder 13 is connected between the receiving tank 7 and the first drying device 15, and the inlet end of the second screw feeder 13 is connected to the inlet end of the first drying device 15, so as to convey the aluminum foil on the liquid surface in the receiving tank 7 to the first drying device 15, and the first drying device 15 is connected to the aluminum foil outlet 702, so as to dry the aluminum foil collected on the liquid surface in the receiving tank 7. The third screw feeder 14 is connected between the receiving tank 7 and the second drying device 16, so as to convey the positive electrode material at the bottom of the receiving tank 7 to the second drying device 16, and the second drying device 16 is connected to the positive electrode material outlet 701, so as to dry the positive electrode material collected in the receiving tank 7.

[0043] In a specific embodiment, the outlet ends of the first drying device 15 and the second drying device 16 are respectively provided with a discharge chute 19 , and the discharge chute 19 is funnel-shaped to facilitate the discharge of materials.

[0044] In a specific embodiment, a second mesh belt conveyor 18 is further provided at the bottom of the receiving tank 7, the size of the second mesh belt conveyor 18 is adapted to the size of the receiving tank 7, and the aperture of the second mesh belt conveyor 18 is 0.5cm-1cm, the belt speed of the second mesh belt conveyor 18 is <0.1m / s, and the second mesh belt conveyor 18 is connected to the positive electrode material outlet 701, so that the positive electrode material at the bottom of the pool is collected by the second mesh belt conveyor 18. A rake is used to collect the aluminum foil floating on the liquid surface in the receiving tank 7, the rake teeth penetrate 8-10cm into the liquid surface, and the rake movement rate is <0.1m / s.

[0045] like Figure 2As shown, in order to facilitate the output of the separated aluminum foil and positive electrode material in the receiving tank 7, the positive electrode material outlet 701 is set near the bottom of the receiving tank 7, and the aluminum foil outlet 702 is set near the surface of the heavy liquid. The density of the aluminum foil is lower than the density of the heavy liquid, and the aluminum foil is difficult to dissolve in the heavy liquid, and there is almost no reaction between the two, so that the aluminum foil in the receiving tank 7 floats on the surface of the liquid in the receiving tank 7; at the same time, the density of the positive electrode material is higher than the density of the heavy liquid, and the positive electrode material is difficult to dissolve in the heavy liquid, and there is almost no reaction between the two, so that the positive electrode material in the receiving tank 7 sinks to the bottom, so that the positive electrode material is output from the positive electrode material outlet 701 at the bottom of the receiving tank 7.

[0046] In a specific embodiment, the undersize material obtained by screening by the screening device 6 is subjected to secondary treatment, and the secondary treatment includes but is not limited to alkali leaching treatment.

[0047] In a specific embodiment, the heavy liquid in the holding tank 7 includes, but is not limited to, one of dichloromethane, chloroform, tribromoethane, carbon tetrachloride or tetrabromoethane. The heavy liquid in this embodiment is tetrabromoethane.

[0048] like Figure 2 As shown, the system also includes at least two condensation recovery devices 17. Specifically, two condensation recovery devices 17 are provided, one of which is installed on the first drying equipment 15, and the other is installed on the second drying equipment 16, so as to recover the heavy liquid for recycling.

[0049] Specific implementation process: the positive electrode sheet of the lithium iron phosphate battery is cut into materials of a preset size, and then the cut materials are immersed in the water tank 4, and a first mesh belt machine 402 is installed in the water tank 4. The first mesh belt machine 402 is arranged at the bottom of the water tank 4 for conveying, and the first mesh belt machine 402 is used to convey materials, and take out the mixed material of the aluminum foil and the positive electrode material after being soaked in the water tank 4, and convey it to the first screw feeder 11 of the drying device 5, and convey the mixed material to the drying device 5 through the first screw feeder 11 for drying, and enter the screening device 6 for screening after drying, and obtain the screened material, and put the screened material into the holding tank 7 added with heavy liquid, and further separate the aluminum foil and the positive electrode material, and obtain the aluminum foil by collecting the material on the liquid surface of the holding tank 7, and obtain the positive electrode material by collecting the material at the bottom of the holding tank 7, and the collected positive electrode material and aluminum foil are dried at 120℃-130℃ respectively, and the heavy liquid vapor in the drying process is condensed and recovered, and the recovered heavy liquid continues to return to the holding tank 7 for recycling.

[0050] Embodiment 2

[0051] Corresponding to the above-mentioned embodiment, the present application provides a production line, which includes the separation system of the aluminum foil and the positive electrode material in the positive electrode sheet of the lithium iron phosphate battery as described above.

[0052] In a specific embodiment, the separation system of aluminum foil and positive electrode material in the positive electrode sheet of the lithium iron phosphate battery comprises: a first feeding unit 1, used to convey the positive electrode sheet of the lithium iron phosphate battery; a slicing device 2, connected to the outlet end of the first feeding unit 1, used to cut the positive electrode sheet of the lithium iron phosphate battery into materials of preset size; a water tank 4, the water tank 4 is used to soak the material, a first mesh belt machine 402 is installed in the water tank 4, the first mesh belt machine 402 is transmission-arranged at the bottom of the water tank 4, and the first mesh belt machine 402 is used to convey the material; a drying device 5 and a screening device 6, the drying device 5 is used to dry the mixed material obtained after passing through the water tank 4, the inlet end of the screening device 6 is connected to the outlet end of the drying device 5, so as to screen the dried mixed material to obtain the material on the screen; a containing tank 7, a heavy liquid is added to the containing tank 7, the density of the heavy liquid is greater than the density of aluminum, one end of the containing tank 7 is provided with a positive electrode material outlet 701, and the other end is provided with an aluminum foil outlet 702.

[0053] In a specific embodiment, the first loading unit 1 includes a conveying channel 101 and a feeding trough 102 installed at the inlet end of the conveying channel 101 , and the conveying channel 101 is provided with a discharge port, which corresponds to the inlet end of the slicing device 2 .

[0054] In a specific embodiment, it further includes a second loading unit 3 , which is connected between the slicing device 2 and the water tank 4 , and is used to transport the cut materials to the water tank 4 .

[0055] In a specific embodiment, the positive electrode material outlet 701 is arranged near the bottom of the containing tank 7, and the aluminum foil outlet 702 is arranged near the surface of the heavy liquid.

[0056] In a specific embodiment, it also includes a first screw feeder 11 and a feeding bin 12 installed on the first screw feeder 11, and the feeding bin 12 corresponds to the outlet end of the first mesh belt machine 402, and transports the material from the first mesh belt machine 402 to the first screw feeder 11, and the outlet end of the first screw feeder 11 is connected to the drying equipment 5.

[0057] In a specific embodiment, it also includes a first drying device 15 and a second drying device 16. The first drying device 15 is connected to the aluminum foil outlet 702 and is used to dry the aluminum foil collected on the liquid surface in the receiving tank 7. The second drying device 16 is connected to the positive electrode material outlet 701 and is used to dry the positive electrode material collected in the receiving tank 7.

[0058] In a specific embodiment, it also includes a second screw feeder 13 and a third screw feeder 14, wherein the second screw feeder 13 is connected between the receiving tank 7 and the first drying device 15, and the third screw feeder 14 is connected between the receiving tank 7 and the second drying device 16.

[0059] In a specific embodiment, at least two condensation recovery devices 17 are further included, wherein one of the condensation recovery devices 17 is installed on the first drying device 15 , and the other of the condensation recovery devices 17 is installed on the second drying device 16 .

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A system for separating aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery, characterized in that: include: A first loading unit (1) is used to transport positive electrode sheets of lithium iron phosphate batteries; A slicing device (2), connected to the outlet end of the first feeding unit (1), used for cutting the lithium iron phosphate battery positive electrode sheet into materials of a preset size; A water trough (4), the water trough (4) being used to soak the material, a first mesh belt machine (402) being installed in the water trough (4), the first mesh belt machine (402) being arranged at the bottom of the water trough (4), and the first mesh belt machine (402) being used to transport the material; A drying device (5) and a screening device (6), wherein the drying device (5) is used to dry the mixed material obtained after passing through the water tank (4), and the inlet end of the screening device (6) is connected to the outlet end of the drying device (5) to screen the dried mixed material to obtain the material on the screen; A holding tank (7) is provided with a heavy liquid added therein, wherein the density of the heavy liquid is greater than the density of aluminum, and a positive electrode material outlet (701) is provided at one end of the holding tank (7) and an aluminum foil outlet (702) is provided at the other end.

2. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 1, characterized in that: The water tank (4) is provided with a heating device (8), a bubbler (9) and a stirrer (10); the heating device (8) is arranged on the upper part of the first mesh belt machine (402); the bubbler (9) comprises a plurality of air outlets, and the air outlets output compressed air into the water tank (4); the stirrer (10) is used to stir the liquid in the water tank (4).

3. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 1 or 2, characterized in that: The first loading unit (1) comprises a conveying channel (101) and a feeding trough (102) installed at the inlet end of the conveying channel (101); the conveying channel (101) is provided with a discharge port, and the discharge port corresponds to the inlet end of the slicing device (2).

4. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 3, characterized in that: It also comprises a second loading unit (3), which is connected between the slicing device (2) and the water tank (4), and is used to transport the cut material to the water tank (4).

5. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 1 or 2, characterized in that: The positive electrode material outlet (701) is arranged near the bottom of the containing tank (7), and the aluminum foil outlet (702) is arranged near the surface of the heavy liquid.

6. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 2, characterized in that: It also includes a first screw feeder (11) and a feeding bin (12) installed on the first screw feeder (11), wherein the feeding bin (12) corresponds to the outlet end of the first mesh belt machine (402) and transports the material from the first mesh belt machine (402) to the first screw feeder (11), and the outlet end of the first screw feeder (11) is connected to the drying equipment (5).

7. The separation system of aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery according to any one of claims 1, 2 or 6, characterized in that: It also includes a first drying device (15) and a second drying device (16), wherein the first drying device (15) is connected to the aluminum foil outlet (702) and is used to dry the aluminum foil collected on the liquid surface in the receiving tank (7), and the second drying device (16) is connected to the positive electrode material outlet (701) and is used to dry the positive electrode material collected in the receiving tank (7).

8. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 7, characterized in that: It also includes a second screw feeder (13) and a third screw feeder (14), wherein the second screw feeder (13) is connected between the receiving tank (7) and the first drying device (15), and the third screw feeder (14) is connected between the receiving tank (7) and the second drying device (16).

9. The separation system of aluminum foil and positive electrode material in the positive electrode sheet of lithium iron phosphate battery according to claim 7, characterized in that: It also includes at least two condensation recovery devices (17), one of which is installed on the first drying device (15) and the other is installed on the second drying device (16).

10. A production line, characterized in that: The production line comprises a separation system of aluminum foil and positive electrode material in a positive electrode sheet of a lithium iron phosphate battery according to any one of claims 1 to 9.

Images