Lithium iron phosphate battery pole piece cleaning and recycling method and equipment

Abstract

The invention provides a lithium iron phosphate battery pole piece cleaning and recycling method and equipment, and belongs to the technical field of waste lithium iron phosphate battery recycling. Comprising a lithium battery recycling equipment main body, a recycling box is arranged at the bottom of the lithium battery recycling equipment main body, a lifting frame body is mounted at the top of the lithium battery recycling equipment main body, a first motor is mounted on one side of the lifting frame body, and a battery pole core is arranged in the lithium battery recycling equipment main body; and the first recycling mechanism is used for recycling residues on the surfaces of the pole pieces. By arranging the first recycling mechanism and the second recycling mechanism, regeneration hindering impurities such as active substance dust, current collector chippings and electrolyte decomposition residues on the surface of the pole piece can be recycled by means of the first recycling mechanism, so that the impurities can be prevented from entering a recycling box to be mixed with the pole piece; therefore, the energy consumption of subsequent recovery and purification treatment of the lithium iron phosphate battery is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of waste lithium iron phosphate battery recycling technology, and in particular to a method and equipment for cleaning and recycling lithium iron phosphate battery electrodes. Background Technology

[0002] With the rapid development of the new energy industry, the application scale of lithium iron phosphate batteries is constantly expanding, and the number of waste lithium iron phosphate batteries is also increasing year by year. If these waste batteries are not handled properly, they will not only waste valuable metal resources such as lithium, iron, copper and aluminum, but also cause serious pollution to the ecological environment. In the recycling and processing of waste lithium iron phosphate batteries, the positive and negative electrodes of the battery must first be separated. This process is completed with the help of lithium battery recycling equipment. The core working logic of the equipment is to rely on mechanical transmission to peel off the coiled positive and negative electrodes and the separator layer by layer.

[0003] However, in actual separation and recycling operations, impurities such as metal shavings, dust, granules, and membrane fragments are commonly found on the surface of the electrode sheets. Due to limitations in the working mechanism of the equipment, the stripping action of lithium battery recycling equipment lacks sufficient force and has no targeted impurity removal design, making it impossible to effectively remove these impurities. These unremoved impurities are separated along with the electrode sheets and remain on the electrode surface. This not only seriously affects the efficiency of subsequent recycling and purification processes but also reduces the purity of the final purified product. At the same time, residual impurities also adhere to the surfaces of transmission components such as rollers and guide wheels, causing unevenness on the roller surfaces. During the electrode sheet rewinding process, this problem leads to uneven force on the electrode sheets, resulting in phenomena such as electrode sheet misalignment and wrinkles, and may even cause incomplete separation of the positive and negative electrode sheets from the separator, further reducing the purity of various materials in the recycling process. Therefore, this application provides a method and equipment for cleaning and recycling lithium iron phosphate battery electrode sheets to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and equipment for cleaning and recycling lithium iron phosphate battery electrodes. By setting up a first recycling mechanism and a second recycling mechanism, the first recycling mechanism can be used to recover regeneration-obstructing impurities such as active material dust, current collector debris, and electrolyte decomposition residue on the electrode surface. This can prevent such impurities from entering the recycling box 2 and mixing with the electrode, thereby effectively reducing the energy consumption of subsequent recycling and purification of lithium iron phosphate batteries. The above settings can solve the problem that the residues on the electrode cannot be removed during the use of current lithium battery recycling equipment.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A method for cleaning and recycling lithium iron phosphate battery electrodes includes the following steps: Step 1: Discharge the retired battery module until the voltage is ≤1.0V; Step 2: Remove the outer casing and metal terminals to obtain the bare battery cell; Step 3: Disassemble the battery cell and separate the positive and negative electrodes; Step 4: After cutting the positive electrode sheet, wash it in an organic solvent to remove the aluminum foil and collect the positive electrode slurry; Step 5: Separate the solid and liquid phases of the cathode slurry, and dry the solid phase to obtain lithium iron phosphate cathode powder; Step 6: Mix the lithium iron phosphate cathode powder with solid sodium sulfate evenly, and then calcine to obtain a mixture; Step 7: Dissolve the mixture in deionized water, and collect the solution after solid-liquid separation; Step 8: Add a precipitant to the solution from Step 7. After the reaction is complete, separate the solid and liquid phases and collect the precipitate, lithium carbonate, and dry it to obtain the finished product.

[0006] This application also provides a lithium iron phosphate battery electrode cleaning device, including a lithium battery recycling device body for the separation process of positive and negative electrodes. The device body is characterized by having a recycling box at its bottom, a lifting frame mounted on its top, a first motor mounted on one side of the lifting frame, and a battery core inside the device body; a first recycling mechanism for recycling residues on the electrode surface, connected to the lifting frame; and a second recycling mechanism for recycling edge strips of the electrode, connected to the first recycling mechanism.

[0007] Optionally, the first recycling mechanism includes a support arm installed at the bottom of the lifting frame, a support frame installed at the bottom of the support arm, an clearance groove adapted to the shape of the support arm on the lifting frame, a first connecting frame installed at the bottom of the support arm, a first mounting plate fixedly connected to the bottom of the first connecting frame, an air knife body installed on the first mounting plate, a connecting rod fixedly connected to the side of the first mounting plate away from the air knife body, a second mounting plate fixedly connected to the side of the connecting rod away from the first mounting plate, and a recycling cover installed on the second mounting plate.

[0008] Optionally, the shape of the first mounting plate is adapted to the shape of the air knife body, and the first mounting plate is provided with a limiting groove adapted to the shape of the air knife body; the shape of the second mounting plate is adapted to the shape of the recovery hood, and the second mounting plate is provided with a limiting groove adapted to the shape of the recovery hood.

[0009] Optionally, the first recycling mechanism includes a support arm installed at the bottom of the lifting frame, the first connecting frame is an arc-shaped structure protruding away from the center of the lifting frame, the first connecting frame is made of plastic, the output end of the first motor is provided with a rotating rod, a rotating block is fixedly connected to the rotating rod, the rotating block is fixedly connected to the support arm, and the first motor is used to adjust the angle of the support arm.

[0010] Optionally, the second recycling mechanism includes a second connecting frame installed on the first connecting frame, with connecting blocks fixedly connected to both ends of the second connecting frame, a third connecting frame fixedly connected to one side of the second connecting frame, a first electric telescopic rod installed on the top of the third connecting frame, a second electric telescopic rod installed on the top of the second connecting frame, a fourth connecting frame fixedly connected to the bottom of the third connecting frame, a connecting frame fixedly connected to the side of the fourth connecting frame away from the third connecting frame, and a hook installed at the bottom of the connecting frame.

[0011] Optionally, the bottom of the connecting frame is provided with a first sliding groove, a first slider is slidably connected in the first sliding groove, a rotating block is installed at the bottom of the first slider, a mounting base is installed at the bottom of the rotating block, a torsion spring is provided at the bottom of the rotating block, a connecting piece is fixedly connected to one side of the connecting frame, and a limiting piece is provided at equal intervals on the side of the connecting piece near the first slider.

[0012] Optionally, the mounting base has a right-angled triangle cross section, the bottom of the mounting base is fixedly connected to the hook, a second motor is installed on one side of the connecting frame, a bidirectional screw is installed at the output end of the second motor, a first screw sleeve is sleeved on the bidirectional screw, and the first screw sleeve is installed on the first slider.

[0013] Optionally, the third connecting frame is an arc-shaped structure that protrudes away from the second connecting frame, and weakening portions are provided on both sides of the third connecting frame.

[0014] Optionally, the connecting frame has a second sliding groove on the side near the third connecting skeleton, a second slider is slidably connected in the second sliding groove, a fifth connecting skeleton is fixedly connected to the side of the second slider near the third connecting skeleton, a scraper is installed on the side of the fifth connecting skeleton near the third connecting skeleton, the scraper has a buffer cavity in the direction away from the center of the connecting frame, the scraper has a blade, and a second threaded sleeve adapted to the shape of the bidirectional screw is provided in the second slider.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a first recycling mechanism and a second recycling mechanism, not only can the first recycling mechanism recover regeneration-obstructing impurities such as active material dust, current collector debris, and electrolyte decomposition residue on the electrode surface, thus preventing these impurities from entering the recycling box and mixing with the electrode, thereby effectively reducing the energy consumption of subsequent recycling and purification of lithium iron phosphate batteries, and improving the recycling efficiency of lithium iron phosphate batteries to a certain extent; furthermore, the second recycling mechanism can be used in conjunction with the first recycling mechanism to recover the edge strips generated during the electrode peeling process remaining on the main body of the lithium battery recycling equipment, preventing the edge strips and their residues from mixing with the electrode in the recycling box, further protecting the battery. This design improves the purification efficiency of the recycling process. Furthermore, the second recycling mechanism effectively solves the problem of strip-shaped residues adhering to the surfaces of transmission components such as rollers and guide wheels within the main body of the lithium battery recycling equipment. It prevents uneven force on the electrode sheets during rewinding due to uneven roller surfaces, avoiding electrode sheet misalignment and wrinkling. It can even prevent incomplete separation of the positive and negative electrode sheets from the separator, thus reducing the purity of the recycled materials. The device has a simple structure, is easy to use and operate, and requires no manual intervention. Its automated design ensures simultaneous recycling of the positive and negative electrode sheets during separation, improving work efficiency while preventing injury and ensuring the safety of workers.

[0016] By incorporating a first connecting frame, an air knife body, and a recycling hood within the first recycling mechanism, not only can the air knife body blow off impurities on the electrode sheets or residual strips on the main body of the lithium battery recycling equipment, but the recycling hood, used in conjunction with the main body, can collect the blown-off residues and strips. This ensures the purity of the collected electrode sheets, effectively reduces the energy consumption of subsequent recycling and purification processes of lithium iron phosphate batteries, and improves the overall recycling efficiency of lithium iron phosphate batteries to a certain extent.

[0017] By incorporating a connecting frame, limiting plate, and hook within the second recycling mechanism, the angles of the air knife body and the recycling hood can be adjusted. For residual edge strips merely attached to the surface of the lithium battery recycling equipment, the suction of the recycling hood can be used directly to complete the recycling process. For edge strips trapped in the grooves and gaps of the lithium battery recycling equipment, the hook can be used to pull them out, thereby further removing various impurities unrelated to the electrode sheets and ensuring the smooth progress of subsequent recycling and purification operations.

[0018] By incorporating a fifth connecting frame and a scraper within the second recycling mechanism, the scraper can approach the edge strip and insert it into the gap between the edge strip and the roller. Then, using the first and second electric telescopic rods, the scraper cuts the edge strip. The cut edge strip is then blown away from the roller by the air knife body, and finally collected by the recycling hood. This further removes various impurities unrelated to the electrode sheet, ensuring the smooth progress of subsequent recycling and purification operations. Moreover, the overall structure is relatively simple and convenient to use.

[0019] In summary, this device can not only remove dust, debris, and other impurities that hinder regeneration from the surface of the electrode, but also recover the strips generated during peeling, preventing impurities from mixing into the electrode, thus improving the recovery rate of the cathode material and reducing the energy consumption of subsequent purification and the cost of wet metallurgical impurity removal; it can also remove residues adhering to the rollers and guide wheels of the equipment, avoiding problems such as electrode misalignment, wrinkles, and incomplete separation caused by uneven roller surfaces, preventing roller rotation obstruction and machine shutdown, and ensuring stable operation of the equipment. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0021] Figure 1 A first-person perspective three-dimensional structural diagram of a lithium iron phosphate battery electrode cleaning and recycling equipment; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 A second-view three-dimensional structural diagram of a lithium iron phosphate battery electrode cleaning and recycling equipment. Figure 4 for Figure 3 Enlarged structural diagram at point B; Figure 5 A three-dimensional structural diagram of the first support frame and support arm in conjunction; Figure 6 for Figure 5 Enlarged structural diagram at point C; Figure 7 A first-view magnified three-dimensional structural diagram showing the support arm and the first connecting frame in conjunction with the structure. Figure 8 for Figure 7 Enlarged structural diagram at point D; Figure 9 A second-view magnified three-dimensional structural diagram showing the cooperation between the support arm and the first connecting frame; Figure 10 for Figure 9 Enlarged structural diagram at point E; Figure 11 A magnified structural diagram from a first-view perspective showing the cooperation between the support arm and the first connecting frame; Figure 12 A magnified schematic diagram from a second perspective showing the structure of the support arm and the first connecting frame.

[0022] Figure label: 1. Main body of lithium battery recycling equipment; 2. Recycling box; 3. Lifting frame; 4. First motor; 5. Support arm; 6. Clearance groove; 7. Support frame; 8. First electric telescopic rod; 9. First connecting frame; 10. Second connecting frame; 11. Third connecting frame; 12. Second electric telescopic rod; 13. Fourth connecting frame; 14. Connecting block; 15. First mounting plate; 16. Air knife body; 17. Connecting rod; 18. Second mounting plate; 19. Recycling cover; 20. Connecting pipe; 21. Connecting frame; 22. First slide groove; 23. First slider; 24. Rotating block; 25. Mounting base; 26. Torsion spring; 27. Connecting plate; 28. Limiting plate; 29. ​​Hook; 30. Fifth connecting frame; 31. Scraper; 32. Second slide groove; 33. Second slider; 34. Second motor; 35. Weakening part; 36. Buffer chamber; 37. Battery core.

[0023] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0024] The following is a detailed description of a method and apparatus for cleaning and recycling lithium iron phosphate battery electrodes provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0025] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when describing a specific feature, structure, or characteristic in conjunction with embodiments, the implementation of such feature, structure, or characteristic in conjunction with other embodiments, whether or not explicitly described, should be within the knowledge of those skilled in the art.

[0026] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0027] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0028] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0029] like Figure 1 and Figure 5 As shown, an embodiment of the present invention provides a method for cleaning and recycling lithium iron phosphate battery electrodes, including the following steps: Step 1: Discharge the retired battery module until the voltage is ≤1.0V; Step 2: Remove the outer casing and metal terminals to obtain the bare battery cell; Step 3: Disassemble the battery cell and separate the positive and negative electrodes; Step 4: After cutting the positive electrode sheet, wash it in an organic solvent to remove the aluminum foil and collect the positive electrode slurry; Step 5: Separate the solid and liquid phases of the cathode slurry, and dry the solid phase to obtain lithium iron phosphate cathode powder; Step 6: Mix the lithium iron phosphate cathode powder with solid sodium sulfate evenly, and then calcine to obtain a mixture; Step 7: Dissolve the mixture in deionized water, and collect the solution after solid-liquid separation; Step 8: Add a precipitant to the solution from Step 7. After the reaction is complete, separate the solid and liquid phases and collect the precipitate lithium carbonate. Dry the precipitate to obtain the final product.

[0030] This application also provides a lithium iron phosphate battery electrode cleaning device, including a lithium battery recycling device body 1 for the positive and negative electrode separation process. A recycling box 2 is located at the bottom of the lithium battery recycling device body 1, and a lifting frame 3 is installed on the top of the lithium battery recycling device body 1. A first motor 4 is installed on one side of the lifting frame 3. The first motor 4 is a mature existing technology, and its working principle and specific structure will not be described in detail here. A battery electrode core 37 is located inside the lithium battery recycling device body 1; a first recycling mechanism is used to recycle residues on the electrode surface, and the first recycling mechanism is connected to the lifting frame 3; a second recycling mechanism is used to... The electrode strips are recycled. The second recycling mechanism is connected to the first recycling mechanism. When separating and recycling the positive and negative electrodes of lithium iron phosphate batteries, this device can use the first recycling mechanism to recover regeneration-obstructing impurities such as active material dust, current collector debris, and electrolyte decomposition residue on the electrode surface. This prevents such impurities from entering the recycling box 2 and mixing with the electrode, thereby effectively reducing the energy consumption of subsequent recycling and purification of lithium iron phosphate batteries and improving the recycling efficiency of lithium iron phosphate batteries to a certain extent. Furthermore, the second recycling mechanism can be used in conjunction with the first recycling mechanism to remove the strips generated during the electrode peeling process remaining on the main body 1 of the lithium battery recycling equipment. The recycling process prevents the edge strips and their residue from mixing with the electrode sheets in the recycling box 2, further ensuring the purification efficiency of the recycling operation. Furthermore, the second recycling mechanism effectively solves the problem of edge strip-shaped residue adhering to the surfaces of transmission components such as rollers and guide wheels inside the main body 1 of the lithium battery recycling equipment. This avoids uneven force on the electrode sheets during rewinding due to uneven roller surfaces, leading to electrode sheet misalignment and wrinkling. It can even prevent incomplete separation of the positive and negative electrode sheets from the separator, thus preventing reduced purity of the recycled materials. The main body 1 of the lithium battery recycling equipment utilizes existing mature technology; its working principle and specific structure will not be elaborated upon here. One side of the lifting frame 3 is equipped with… Equipped with a lifting assembly, which is also a mature existing technology, its working principle and specific structure will not be elaborated further. The rollers, guide wheels, and other components inside the main body 1 of the lithium battery recycling equipment are also mature existing technologies, and their working principles and specific structures will not be elaborated further. The main body 1 of the lithium battery recycling equipment is used to separate the positive electrode, negative electrode, and separator of the battery core 37, and the recycling box 2 is used to collect the positive and negative electrode materials. This device has a relatively simple structure, is easy to use and operate, and requires no manual intervention. The automated design can ensure the synchronous recycling process of the positive and negative electrode sheets during separation, which improves work efficiency and avoids personnel injury, ensuring the safety of the staff.

[0031] like Figures 1 to 3 , Figure 5 , Figure 7 and Figures 9 to 12As shown, the first recycling mechanism includes a support arm 5 installed at the bottom of the lifting frame 3. A support frame 7 is installed at the bottom of the support arm 5. The lifting frame 3 has a clearance groove 6 that matches the shape of the support arm 5. A first connecting frame 9 is installed at the bottom of the support arm 5. A first mounting plate 15 is fixedly connected to the bottom of the first connecting frame 9. An air knife body 16 is installed on the first mounting plate 15. A connecting rod 17 is fixedly connected to the side of the first mounting plate 15 away from the air knife body 16. A second mounting plate 18 is fixedly connected to the side of the connecting rod 17 away from the first mounting plate 15. A recovery cover 19 is installed on the second mounting plate 18. A rotating rod is provided at the output end of the first motor 4, and a rotating block is fixedly connected to the rotating rod. The rotating block is fixedly connected to the support arm 5. The first motor 4 is used to adjust the angle of the support arm 5 and to drive the rotating rod to rotate. There are two support arms 5, two first connecting frames 9, two first mounting plates 15, two connecting rods 17, and two second mounting plates 18. These two support arms 5, two first connecting frames 9, two first mounting plates 15, two connecting rods 17, and two second mounting plates 18 are symmetrically arranged at the bottom of the lifting frame 3. The air knife body 16 and the recovery cover 19 are also present. A connecting pipe 20 is installed on one side of the cover 19. The bottom of the connecting pipe 20 is connected to the main body. The main body is used to blow off impurities on the electrode sheets or residual strips on the main body 1 of the lithium battery recycling equipment by the air knife body 16. The recycling cover 19 is used in conjunction with the main body to collect the blown-off residue and strips. During installation, the air knife body 16 can be quickly installed at the bottom of the first connecting frame 9 with the help of two first mounting plates 15. At the same time, the recycling cover 19 can be quickly installed on one side of the air knife body 16 with the help of two second mounting plates 18. During the installation of the first mounting plates 15, The first connecting frame 9 undergoes elastic deformation. The resulting elastic force allows the first mounting plate 15 and the second mounting plate 18 to simultaneously clamp the air knife body 16 and the recovery cover 19, further ensuring the installation stability of the air knife body 16 and the recovery cover 19. During the separation operation of the positive and negative electrode sheets, the lifting frame 3 is controlled to move its components closer to the electrode surface, aligning the air knife body 16 and the recovery cover 19 with the electrode sheet. Subsequently, the main body is activated simultaneously, causing the air knife body 16 and the recovery cover 19 to begin working, blowing off the residue on the electrode sheet and completing the recycling process. The combined use of the above structures ensures the purity of the collected electrode sheets, thereby effectively reducing the energy consumption of subsequent recycling and purification of lithium iron phosphate batteries, while also improving the recycling efficiency of lithium iron phosphate batteries to a certain extent.

[0032] Furthermore, the support frame 7 has a convex-shaped structure, and the first connecting frame 9 has an arc-shaped structure that protrudes away from the center of the lifting frame 3, making it easy for the first connecting frame 9 to deform under force. The first connecting frame 9 is made of plastic material, which itself has good deformation ability. The shape of the first mounting plate 15 is adapted to the shape of the air knife body 16. The first mounting plate 15 has a limiting groove adapted to the shape of the air knife body 16, so that the air knife body 16 is more stably mounted on the first mounting plate 15. The shape of the second mounting plate 18 is adapted to the shape of the recovery cover 19. The second mounting plate 18 has a limiting groove adapted to the shape of the recovery cover 19, so that the recovery cover 19 is more stably mounted on the second mounting plate 18.

[0033] like Figures 3 to 12As shown, the second recycling mechanism includes a second connecting frame 10 mounted on a first connecting frame 9. Connecting blocks 14 are fixedly connected to both ends of the second connecting frame 10, connecting the second connecting frame 10 to the first connecting frame 9. A third connecting frame 11 is fixedly connected to one side of the second connecting frame 10. A first electric telescopic rod 8 is mounted on the top of the third connecting frame 11, and the bottom of the first electric telescopic rod 8 is fixedly connected to the third connecting frame 11. A second electric telescopic rod 12 is mounted on the top of the second connecting frame 10, and the top of the second electric telescopic rod 12 is rotatably connected to the lifting frame 3. A fourth connecting block 14 is fixedly connected to the bottom of the third connecting frame 11. A connecting frame 21 is fixedly connected to the side of the fourth connecting frame 13 away from the third connecting frame 11. A hook 29 is installed at the bottom of the connecting frame 21. A first sliding groove 22 is formed at the bottom of the connecting frame 21, and a first slider 23 is slidably connected within the first sliding groove 22. A rotating block 24 is installed at the bottom of the first slider 23, and a mounting base 25 is installed at the bottom of the rotating block 24. A torsion spring 26 is provided at the bottom of the rotating block 24. The torsion spring 26 is a mature existing technology, and its working principle and specific structure will not be elaborated upon here. A connecting piece 27 is fixedly connected to one side of the connecting frame 21. Limiting pieces 28 are equidistantly provided on the side of the connecting piece 27 near the first slider 23. The mounting base 25 has a cross-section... The surface is a right-angled triangle. The bottom of the mounting base 25 is fixedly connected to the hook 29. A second motor 34 is installed on one side of the connecting frame 21. A bidirectional screw is installed at the output end of the second motor 34. The second motor 34 is a mature existing technology, and its working principle and specific structure will not be described in detail here. The second motor 34 is used to drive the bidirectional screw to rotate. A first threaded sleeve is fitted on the bidirectional screw. The first threaded sleeve is installed on the first slider 23. A second slide groove 32 is opened on the side of the connecting frame 21 near the third connecting frame 11. A second slider 33 is slidably connected in the second slide groove 32. A second threaded sleeve adapted to the shape of the bidirectional screw is provided in the second slider 33. The second slider 33 is close to the third connecting frame 11. A fifth connecting frame 30 is fixedly connected to one side of the connecting frame 11. A scraper 31 is installed on the side of the fifth connecting frame 30 near the third connecting frame 11. The scraper 31 is equipped with a blade. The first electric telescopic rod 8 and the second electric telescopic rod 12 are existing mature technologies, and their working principles and specific structures will not be described in detail here. After the positive and negative electrode sheets are separated once, there will be edge strips left on the main body 1 of the lithium battery recycling equipment. At this time, the first motor 4 can be started to drive the support arm 5 to rotate, adjust the angle of the first connecting frame 9, and then adjust the angle of the air knife body 16 and the recycling cover 19. Then, the lifting frame 3 is controlled to move closer to the position of the edge strips left on the main body 1 of the lithium battery recycling equipment.For residual strips merely attached to the surface of the lithium battery recycling equipment body 1, the suction of the recycling cover 19 can be used directly for recycling. For strips stuck in the grooves of the lithium battery recycling equipment body 1, hooks 29 are needed to hook them out. Specifically, the second electric telescopic rod 12 and the first electric telescopic rod 8 are activated simultaneously, causing the second connecting frame 10 to move along the guide of the first connecting frame 9, driving the connecting frame 21 closer to the location of the residual strips on the lithium battery recycling equipment body 1. Then, the hooks 29 are vertically inserted into the grooves of the lithium battery recycling equipment body 1. Inside the groove, the second motor 34 is then started to drive the bidirectional screw to rotate, causing the first slider 23 to move along the first slide groove 22, driving the rotating block 24 and the first mounting plate 15. Due to the blocking effect of the limiting plate 28, the mounting base 25 will undergo a 90-degree angle change when it approaches the limiting plate 28. At the same time, the torsion spring 26 will deform, thereby driving the hook 29 to rotate synchronously, so that the hook 29 is aligned with the edge strip. Then, the first electric telescopic rod 8 and the second electric telescopic rod 12 are controlled to make the hook 29 hook the edge strip. The second motor 34 is controlled again to make the hook 29 and the limiting plate 28 rotate synchronously. When the sheet 28 separates, the torsion spring 26 causes the hook 29 to rotate back to its initial angle, allowing the hook 29 and the edge strip to be removed together. After the hook 29 hooks out the edge strip, the recovery cover 19 collects it. During the adjustment of the first electric telescopic rod 8 and the second electric telescopic rod 12, the telescopic lengths of both can be controlled. This not only adjusts the height of the connecting frame 21 but also controls its angle, further increasing the flexibility of the hook 29 in cleaning the edge strip. Furthermore, when the roller is wrapped with edge strip, adjusting the position of the connecting frame 21 allows the scraper 31 to engage with the edge strip. The strip is aligned, and then the second motor 34 is controlled to drive the second slider 33 to move, so that the scraper 31 moves closer to the strip and inserts into the gap between the strip and the roller. Then, the first electric telescopic rod 8 and the second electric telescopic rod 12 are controlled to make the scraper 31 cut the strip. Then, the cut strip is blown away from the roller by the air knife body 16. Finally, the collection is completed with the help of the recycling cover 19. The combined use of the above structures further removes various impurities unrelated to the electrode, thereby ensuring the smooth progress of subsequent recycling and purification operations. Moreover, the overall structure is relatively simple and convenient to use.

[0034] Furthermore, the fourth connecting frame 13 is an arc-shaped structure protruding towards the lifting frame 3. The length of the second connecting frame 10 is less than the length of the air knife body 16 and the recovery cover 19. When the second connecting frame 10 moves along the first connecting frame 9, the first connecting frame 9 always controls the first mounting plate 15 and the second mounting plate 18 to clamp the air knife body 16 and the recovery cover 19. The third connecting frame 11 is an arc-shaped structure protruding away from the second connecting frame 10. The third connecting frame 11 is made of plastic, giving it a certain elastic deformation capability. This allows for a certain buffer when the hook 29 contacts the lithium battery recycling equipment body 1, preventing... The hook 29 scrapes against the main body 1 of the lithium battery recycling equipment. Weakened parts 35 are opened on both sides of the third connecting frame 11, which increases the deformation capacity of the third connecting frame 11. This allows the first electric telescopic rod 8 to act on the third connecting frame 11, causing the third connecting frame 11 to deform. This makes the angle of the connecting frame 21 adjustable. The scraper 31 has a buffer cavity 36 in the direction away from the center of the connecting frame 21, so that when the scraper 31 contacts the roller, its edge can generate a certain deformation buffer. The cross-sections of the connecting frame 21, the first slide groove 22 and the second slider 33 are all T-shaped, so that the first slide groove 22 and the second slider 33 can be stably placed in the connecting frame 21 without accidentally falling off.

[0035] The working principle of the technical solution provided by this invention is as follows: In use, by controlling the lifting assembly of the lifting frame 3, the various related components on the lifting frame 3 are moved closer to the electrode surface, so that the air knife body 16 and the recovery hood 19 are precisely aligned with the electrode position. Then, the main body is started simultaneously. The air knife body 16 starts working to blow off the active material dust, current collector debris, electrolyte decomposition residue and other regeneration-obstructing impurities on the electrode surface. The recovery hood 19 starts suction at the same time to collect the blown-off impurities in time. During the process, the first recovery mechanism, through the cooperation of the air knife body 16 and the recovery hood 19, prevents impurities from entering the recovery box 2 and mixing with the electrode. The second recovery mechanism simultaneously performs preliminary recovery of the edge strips generated during the electrode peeling process to prevent the edge strips and their residues from mixing into the recovery box 2, which reduces the subsequent purification process. This method minimizes energy consumption while ensuring the purification efficiency of the recycling operation. It also prevents strip-like residue from adhering to the surfaces of transmission components such as rollers and guide wheels within the main body 1 of the lithium battery recycling equipment. This prevents uneven force on the electrode sheets during rewinding, causing deviation, wrinkles, or incomplete separation of the positive and negative electrode sheets from the separator due to uneven surface texture, thus ensuring the purity of the recycled materials. After the positive and negative electrode sheets are separated once, for the remaining strips on the main body 1 of the lithium battery recycling equipment, the first motor 4 is activated to drive the rotating rod, which in turn rotates the support arm 5. This adjusts the angle of the first connecting frame 9, synchronizing the angles of the air knife body 16 and the recycling cover 19 with the position of the remaining strips. Then, the lifting frame 3 is controlled to move the relevant components towards the remaining strips on the main body 1 of the lithium battery recycling equipment. For residual strips that are only attached to the surface of the lithium battery recycling equipment body 1, the recycling can be completed directly using the suction of the recycling cover 19; for strips that are stuck in the groove of the lithium battery recycling equipment body 1, they are hooked out with the help of the hook 29. The specific steps are as follows: the second electric telescopic rod 12 and the first electric telescopic rod 8 are started simultaneously, so that the second connecting frame 10 moves along the guide of the first connecting frame 9, driving the connecting frame 21 to move closer to the residual strip position, and the hook 29 is vertically inserted into the groove of the lithium battery recycling equipment body 1; the second motor 34 is started to drive the bidirectional screw to rotate, so that the first slider 23 drives the rotating block 24 and the first mounting plate 15 to move along the first slide groove 22. Due to the blocking effect of the limiting plate 28, the mounting base 25 is close to the groove. When the limiting plate 28 changes angle by 90 degrees, the torsion spring 26 deforms, which in turn drives the hook 29 to rotate synchronously, aligning the hook 29 with the edge strip. The first electric telescopic rod 8 and the second electric telescopic rod 12 are controlled to make the hook 29 hook the edge strip. The second motor 34 is controlled again to separate the hook 29 from the limiting plate 28. Under the restoring force of the torsion spring 26, the hook 29 rotates back to the initial angle, and the edge strip can be taken out together. Finally, the edge strip is collected by the recycling cover 19. When the edge strip is wound on the roller of the main body 1 of the lithium battery recycling equipment, the position of the connecting frame 21 is adjusted so that the scraper 31 is aligned with the edge strip. The second motor 34 is controlled to drive the second slider 33 to move, so that the scraper 31 moves closer to the edge strip and inserts into the gap between the edge strip and the roller.The first electric telescopic rod 8 and the second electric telescopic rod 12 are controlled to cause the scraper 31 to cut the edge strip; then, the cut edge strip is blown away from the roller shaft by the air knife body 16, and finally collected by the collection cover 19. Furthermore, during the adjustment of the first electric telescopic rod 8 and the second electric telescopic rod 12, controlling their extension length not only adjusts the position and height of the connecting frame 21, but also controls the angle of the connecting frame 21, further improving the flexibility of the hook 29 in cleaning the edge strip. This device has a simple overall structure, is easy to use and operate, and requires no manual intervention.

[0036] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for cleaning and recycling lithium iron phosphate battery electrodes, characterized in that, Includes the following steps, Step 1: Discharge the retired battery module until the voltage is ≤1.0V; Step 2: Remove the outer casing and metal terminals to obtain the bare battery cell; Step 3: Disassemble the battery cell and separate the positive and negative electrodes; Step 4: After cutting the positive electrode sheet, wash it in an organic solvent to remove the aluminum foil and collect the positive electrode slurry; Step 5: Separate the solid and liquid phases of the cathode slurry, and dry the solid phase to obtain lithium iron phosphate cathode powder; Step 6: Mix the lithium iron phosphate cathode powder with solid sodium sulfate evenly, and then calcine to obtain a mixture; Step 7: Dissolve the mixture in deionized water, and collect the solution after solid-liquid separation; Step 8: Add a precipitant to the solution from Step 7. After the reaction is complete, separate the solid and liquid phases and collect the precipitate lithium carbonate. Dry the precipitate to obtain the final product.

2. A lithium iron phosphate battery electrode cleaning device, characterized in that, The lithium battery recycling equipment includes a main body for separating positive and negative electrode plates. The bottom of the main body is equipped with a recycling box, the top of the main body is equipped with a lifting frame, a first motor is installed on one side of the lifting frame, and a battery electrode core is provided inside the main body. The first recycling mechanism is used to recycle the residue on the surface of the electrode sheet, and the first recycling mechanism is connected to the lifting frame. The second recycling mechanism is used to recycle the edge strips of the electrode sheet, and the second recycling mechanism is connected to the first recycling mechanism.

3. The lithium iron phosphate battery electrode cleaning equipment according to claim 2, characterized in that, The first recycling mechanism includes a support arm installed at the bottom of the lifting frame. A support frame is installed at the bottom of the support arm. An clearance groove adapted to the shape of the support arm is provided on the lifting frame. A first connecting frame is installed at the bottom of the support arm. A first mounting plate is fixedly connected to the bottom of the first connecting frame. An air knife body is installed on the first mounting plate. A connecting rod is fixedly connected to the side of the first mounting plate away from the air knife body. A second mounting plate is fixedly connected to the side of the connecting rod away from the first mounting plate. A recycling cover is installed on the second mounting plate.

4. The lithium iron phosphate battery electrode cleaning equipment according to claim 3, characterized in that, The shape of the first mounting plate is adapted to the shape of the air knife body, and a limiting groove adapted to the shape of the air knife body is provided on the first mounting plate. The shape of the second mounting plate is adapted to the shape of the recovery hood, and a limiting groove adapted to the shape of the recovery hood is provided on the second mounting plate.

5. The lithium iron phosphate battery electrode cleaning equipment according to claim 4, characterized in that, The first connecting frame is an arc-shaped structure that protrudes away from the center of the lifting frame. The first connecting frame is made of plastic. The output end of the first motor is provided with a rotating rod. A rotating block is fixedly connected to the rotating rod. The rotating block is fixedly connected to the support arm. The first motor is used to adjust the angle of the support arm.

6. The lithium iron phosphate battery electrode cleaning equipment according to claim 5, characterized in that, The second recycling mechanism includes a second connecting frame installed on the first connecting frame. Both ends of the second connecting frame are fixedly connected to connecting blocks. A third connecting frame is fixedly connected to one side of the second connecting frame. A first electric telescopic rod is installed on the top of the third connecting frame. A second electric telescopic rod is installed on the top of the second connecting frame. A fourth connecting frame is fixedly connected to the bottom of the third connecting frame. A connecting frame is fixedly connected to the side of the fourth connecting frame away from the third connecting frame. A hook is installed at the bottom of the connecting frame.

7. The lithium iron phosphate battery electrode cleaning equipment according to claim 6, characterized in that, The bottom of the connecting frame is provided with a first sliding groove, and a first slider is slidably connected in the first sliding groove. A rotating block is installed at the bottom of the first slider, and a mounting base is installed at the bottom of the rotating block. A torsion spring is provided at the bottom of the rotating block. A connecting piece is fixedly connected to one side of the connecting frame, and a limiting piece is provided at equal intervals on the side of the connecting piece near the first slider.

8. The lithium iron phosphate battery electrode cleaning equipment according to claim 7, characterized in that, The mounting base has a right-angled triangle cross section. The bottom of the mounting base is fixedly connected to the hook. A second motor is installed on one side of the connecting frame. A bidirectional screw is installed at the output end of the second motor. A first threaded sleeve is fitted on the bidirectional screw. The first threaded sleeve is installed on the first slider.

9. The lithium iron phosphate battery electrode cleaning equipment according to claim 8, characterized in that, The third connecting frame is an arc-shaped structure that protrudes away from the second connecting frame, and weakening portions are provided on both sides of the third connecting frame.

10. A lithium iron phosphate battery electrode cleaning device according to claim 9, characterized in that, The connecting frame has a second sliding groove on the side near the third connecting skeleton, and a second slider is slidably connected in the second sliding groove. A fifth connecting skeleton is fixedly connected to the side of the second slider near the third connecting skeleton. A scraper is installed on the side of the fifth connecting skeleton near the third connecting skeleton. The scraper has a buffer cavity in the direction away from the center of the connecting frame. The scraper has a blade. A second threaded sleeve adapted to the shape of the bidirectional screw is provided in the second slider.

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