Recycling Method and System for Cathode Material of Waste Lithium Iron Phosphate Batteries

Abstract

The present invention provides a method and system for recycling the cathode material of waste lithium iron phosphate batteries, which relates to the technical field of regeneration of useful components of waste lithium iron phosphate batteries. The method includes: stripping the cathode sheet from the waste lithium iron phosphate battery, where the cathode sheet includes aluminum foil and the cathode material adhered to the aluminum foil; respectively clamping two parts of the aluminum foil; moving the area between the two clamped parts of the aluminum foil to the right; scraping off the cathode material on the aluminum foil and collecting it; extracting lithium ions from the cathode material; using the lithium ions to prepare the cathode material of the lithium iron phosphate battery; the scraper moves along the width direction of the aluminum foil, and the movement path of the scraper includes a backward path and a forward path. The system applies the above method. The scraper can continuously scrape the cathode material at different positions on the aluminum foil on the premise of good positioning of the aluminum foil, and the whole scraping process is efficient and stable.

Description

Technical Field

[0001] The present invention relates to the technical field of recycling useful components of waste lithium iron phosphate batteries, and more particularly to a method and system for recycling the cathode material of waste lithium iron phosphate batteries. Background Art

[0002] The cathode plate of a lithium iron phosphate battery includes an aluminum foil and a cathode material (lithium iron phosphate (LiFePO4), also called black powder), and the cathode material is adhered to the surface of the aluminum foil. The cathode material contains lithium element. Lithium iron phosphate (LiFePO4) batteries have the characteristics of high safety, good stability, economy and environmental protection, and are widely used in new energy vehicles and energy storage fields.

[0003] With the increasing number of waste lithium batteries, accelerating the development of recycling technologies for waste lithium batteries has become a consensus in the industry. Therefore, it is necessary to design a method and system for recycling the cathode material of waste lithium iron phosphate batteries to recycle the lithium element in the cathode material of waste lithium iron phosphate batteries for preparing a brand-new cathode material of lithium iron phosphate batteries, and to promote the sustainable development of the lithium battery industry. Summary of the Invention

[0004] In view of the above situation, the present invention provides a method and system for recycling the cathode material of waste lithium iron phosphate batteries, which can recycle the cathode material of waste lithium iron phosphate batteries and is conducive to promoting the sustainable development of the lithium battery industry.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a method for recycling the cathode material of waste lithium iron phosphate batteries, including:

[0007] Step S1: Strip the cathode plate from the waste lithium iron phosphate battery. The cathode plate includes an aluminum foil and a cathode material adhered to the aluminum foil;

[0008] Step S2: Clamp two parts of the aluminum foil at a first clamping station and a second clamping station respectively. The first clamping station and the second clamping station are arranged at intervals along the length direction of the aluminum foil;

[0009] Step S3: Move the area between the two clamped parts of the aluminum foil to the scraping station to the right;

[0010] Step S4: Scrape off the cathode material on the aluminum foil along the width direction of the aluminum foil and collect it;

[0011] Step S5: Release the clamping of the aluminum foil;

[0012] Step S6: Repeat steps S2 to S5 to continuously recycle the cathode material on the aluminum foil;

[0013] Step S7: Extract lithium ions from the positive electrode material obtained in step S4;

[0014] Step S8: Use the lithium ions obtained in step S7 to prepare a brand-new positive electrode material for a lithium iron phosphate battery;

[0015] Among them, a scraper is provided at the scraping station. The scraper moves along the width direction of the aluminum foil. The moving path of the scraper includes a backward path and a forward path. The scraper forms the forward path after moving in the direction opposite to the backward path. The scraper moves in a cycle along the backward path and the forward path.

[0016] In some embodiments of the present invention, the backward path includes a backward first path, a backward second path, a backward third path, a backward fourth path, and a backward fifth path that are connected in sequence;

[0017] The forward path includes a forward first path, a forward second path, a forward third path, a forward fourth path, and a forward fifth path that are connected in sequence;

[0018] Among them, the backward first path coincides with and is opposite to the forward fifth path, the backward second path coincides with and is opposite to the forward fourth path, the backward third path coincides with and is opposite to the forward third path, the backward fourth path coincides with and is opposite to the forward second path, and the backward fifth path coincides with and is opposite to the forward first path;

[0019] The lengths of the backward third path and the forward third path are greater than or equal to the width of the aluminum foil;

[0020] When the scraper moves along the backward first path, two parts of the aluminum foil are clamped at the first clamping station and the second clamping station by the first clamping mechanism and the second clamping mechanism respectively; when the scraper moves along the backward second path, the area between the two clamped parts of the aluminum foil is moved to the right to the scraping station; when the scraper moves along the backward third path, the first clamping mechanism and the second clamping mechanism maintain the clamping and limiting of the aluminum foil to fix the aluminum foil in the current position, so as to facilitate scraping off the positive electrode material on the aluminum foil by the scraper; when the scraper moves along the backward fourth path, the clamping of the aluminum foil is released; when the scraper moves along the backward fifth path, the first clamping mechanism and the second clamping mechanism move leftward to reset;

[0021] When the scraper moves along the forward first path, the other two parts of the aluminum foil are clamped at the first clamping station and the second clamping station by the first clamping mechanism and the second clamping mechanism respectively; when the scraper moves along the forward second path, the area between the other two clamped parts of the aluminum foil is shifted to the scraping station to the right; when the scraper moves along the forward third path, the first clamping mechanism and the second clamping mechanism maintain the clamping and limiting of the aluminum foil, so that the aluminum foil is fixed in the current position, so as to facilitate scraping the positive electrode material on the aluminum foil by the scraper; when the scraper moves along the forward fourth path, the clamping of the aluminum foil is released; when the scraper moves along the forward fifth path, the first clamping mechanism and the second clamping mechanism are shifted to the left to reset.

[0022] In some embodiments of the present invention, step S7 includes:

[0023] Step S71, pressing the positive electrode material in step S6 into a sheet material, and a plurality of holes are distributed on the sheet material;

[0024] Step S72, using the sheet material as the cathode of the electrolytic cell and using a carbon rod as the anode of the electrolytic cell, and adopting an electrolytic reduction method to leach lithium ions into the electrolyte of the electrolytic cell.

[0025] In some embodiments of the present invention, a plurality of holes are distributed on the sheet material.

[0026] In a second aspect, the present invention provides a recycling system for the positive electrode material of a waste lithium iron phosphate battery, including:

[0027] A support table, on which the first clamping station and the second clamping station are arranged at intervals along its length direction;

[0028] A first clamping mechanism, arranged at the first clamping station;

[0029] A second clamping mechanism, arranged at the second clamping station; the first clamping mechanism and the second clamping mechanism are respectively used for clamping two parts of the aluminum foil; the first clamping mechanism and the second clamping mechanism can move left or right synchronously;

[0030] A scraping mechanism, including the scraper;

[0031] A material receiving mechanism, including a material receiving hopper arranged below the support table for collecting the positive electrode material.

[0032] In some embodiments of the present invention, two lifting blocks are arranged on the upper side of the scraper, and the lifting blocks are slidably connected with a guide rod, and the axis of the guide rod is arranged along the width direction of the support table.

[0033] In some embodiments of the present invention, the first clamping mechanism includes:

[0034] A first vertical plate;

[0035] The first supporting plate is fixed on the first vertical plate. A first groove is formed in the supporting table. The lower side of the first supporting plate is in sliding contact with the bottom of the first groove, and the upper side of the first supporting plate can be in contact with the lower side of the aluminum foil.

[0036] The first clamping plate is located above the first supporting plate and is longitudinally slidably connected to the first vertical plate. The lower side of the first clamping plate can be in contact with the upper side of the aluminum foil.

[0037] The first hanging ring has one end connected to the first clamping plate and the other end connected to the first cross bar.

[0038] One end of the first cross bar is connected to the guiding plate and the other end is connected to the lifting block. The lifting block can drive the first cross bar to move back and forth, and the first cross bar can move left and right and up and down relative to the lifting block.

[0039] The guiding plate is fixedly arranged on the supporting table. The guiding plate is provided with guiding tracks for guiding the up and down movement or left and right movement of the first cross bar.

[0040] In some embodiments of the present invention, the second clamping mechanism includes:

[0041] The second vertical plate;

[0042] The second supporting plate is fixed on the second vertical plate. A second groove is formed in the supporting table. The lower side of the second supporting plate is in sliding contact with the bottom of the second groove, and the upper side of the second supporting plate can be in contact with the lower side of the aluminum foil.

[0043] The second clamping plate is located above the second supporting plate and is longitudinally slidably connected to the second vertical plate. The lower side of the second clamping plate can be in contact with the upper side of the aluminum foil.

[0044] The second hanging ring has one end connected to the second clamping plate and the other end connected to the second cross bar.

[0045] One end of the second cross bar is connected to the first cross bar. The second cross bar moves along with the first cross bar.

[0046] In some embodiments of the present invention, it further includes:

[0047] The fixing frame is fixedly arranged. The fixing frame is in a T shape, and an air inlet hole is arranged on the vertical part of the fixing frame.

[0048] The air supply pipeline is connected to the air inlet hole and is used for conveying hot air flow at 45° - 55° to the air inlet hole.

[0049] The movable baffle is arranged to move left and right and is slidably connected to the fixed frame. The movable baffle and the fixed frame can jointly define a space to form a cavity, and the cavity can communicate with the material receiving hopper. An extension rod is arranged on one side of the movable baffle. The extension rod is located in the cavity and can block the air inlet hole.

[0050] In some embodiments of the present invention, it further includes:

[0051] The leveling station is arranged on the left side of the first clamping station and the second clamping station. The width of the area of the support table located at the leveling station is slightly smaller than the width of the aluminum foil.

[0052] A plurality of jet heads connected to the air supply pipeline are uniformly arranged along the width direction of the support table obliquely above the leveling station, and the jet direction of the jet heads is obliquely downward towards the leveling station.

[0053] The embodiments of the present invention at least have the following advantages or beneficial effects:

[0054] During the reciprocating movement of the scraper along the backward path and the forward path, the positive electrode material at different positions of the aluminum foil can be continuously scraped while ensuring good positioning of the aluminum foil. The entire scraping process is efficient and stable, which is beneficial to ensuring the recovery efficiency of the positive electrode material.

[0055] Other features and advantages of the present invention will be described in the subsequent description, and some will become obvious from the description or can be understood by implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0057] Figure 1 It is a schematic diagram of the backward path and the forward path;

[0058] Figure 2 It is a schematic diagram of the structure of the separation device and the pressing device;

[0059] Figure 3 For Figure 2 The partial enlarged view of position A in;

[0060] Figure 4 For Figure 2 And Figure 3 The schematic diagram of the structure of the guiding track on the right side of the guiding plate in,Figure 4 The arrow direction in the figure is the moving direction of the first cross bar.

[0061] Icon:

[0062] 11 - First clamping station, 12 - Second clamping station, 13 - Scraping station, 14 - Scraping knife, 15 - Aluminum foil,

[0063] 21 - First backward path, 22 - Second backward path, 23 - Third backward path, 24 - Fourth backward path, 25 - Fifth backward path, 26 - First forward path, 27 - Second forward path, 28 - Third forward path, 29 - Fourth forward path, 31 - Fifth forward path,

[0064] 41 - Support table,

[0065] 42 - First clamping mechanism, 421 - First vertical plate, 422 - First support plate, 423 - First clamping plate, 424 - First lifting ring, 425 - First cross bar, 426 - Guide plate,

[0066] 43 - Second clamping mechanism, 431 - Second vertical plate, 432 - Second support plate, 433 - Second clamping plate, 434 - Second cross bar,

[0067] 441 - Hoisting block, 442 - Guide rod, 443 - Moving block, 444 - Spring,

[0068] 451 - Material receiving hopper,

[0069] 51 - Rear downward pressure guide rail, 52 - Rear rightward movement guide rail, 53 - Rear holding guide rail, 54 - Rear upward movement guide rail, 55 - Rear leftward movement guide rail, 56 - Front downward pressure guide rail, 57 - Front rightward movement guide rail, 58 - Front holding guide rail, 59 - Front upward movement guide rail, 61 - Front leftward movement guide rail, 62 - Upward movement transfer guide rail, 63 - Downward movement transfer guide rail,

[0070] 64 - Cavity, 65 - Extension rod, 66 - Air inlet hole, 67 - Fixed bracket, 68 - Air supply pipeline, 69 - Movable enclosure,

[0071] 71 - Flattening station, 72 - Jet head. Detailed implementation manner

[0072] In the following, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present invention.

[0073] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "bottom", "inner", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present invention.

[0074] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0075] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0076] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0077] Embodiment

[0078] In a first aspect, referring to Figure 1 , this embodiment provides a method for recycling the positive electrode material of waste lithium iron phosphate batteries, including the following steps:

[0079] Step S1: Strip the positive electrode sheet from the waste lithium iron phosphate battery. The positive electrode sheet includes an aluminum foil 15 and a positive electrode material adhered to the aluminum foil 15.

[0080] Step S2: Clamp two parts of the aluminum foil 15 at the first clamping station 11 and the second clamping station 12 respectively. The first clamping station 11 and the second clamping station 12 are spaced along the length direction of the aluminum foil 15 ( Figure 1 the left - right direction shown).

[0081] Step S3: Move the area between the two clamped parts of the aluminum foil 15 to the scraping station 13 to the right. The first clamping station 11, the second clamping station 12, and the scraping station 13 belong to a set area, and their positions remain unchanged.

[0082] Step S4. Scrape off the positive electrode material on the aluminum foil 15 along the width direction of the aluminum foil 15 ( Figure 1 the front-back direction shown in the figure) and collect it;

[0083] Step S5. Release the clamping of the aluminum foil 15;

[0084] Step S6. Repeat the above steps S2 to S5;

[0085] Step S7. Extract lithium ions from the positive electrode material obtained in step S4;

[0086] Step S8. Use the lithium ions obtained in step S7 to prepare a brand-new positive electrode material for a lithium iron phosphate battery;

[0087] In a specific implementation scenario, the above steps S2 to S6 are implemented in the following manner:

[0088] As Figure 1 shown in the figure, a scraper 14 is provided at the scraping station 13. The scraper 14 moves along the width direction of the aluminum foil 15. The moving path of the scraper 14 includes a backward path and a forward path. The scraper 14 forms a forward path after moving in the direction opposite to the backward path. The scraper 14 moves cyclically along the backward path and the forward path. Specifically, the backward path includes successively connected backward first path 21, backward second path 22, backward third path 23, backward fourth path 24, and backward fifth path 25; the forward path includes successively connected forward first path 26, forward second path 27, forward third path 28, forward fourth path 29, and forward fifth path 31. Among them, the backward first path 21 coincides with and is opposite to the forward fifth path 31, the backward second path 22 coincides with and is opposite to the forward fourth path 29, the backward third path 23 coincides with and is opposite to the forward third path 28, the backward fourth path 24 coincides with and is opposite to the forward second path 27, and the backward fifth path 25 coincides with and is opposite to the forward first path 26; the lengths of the backward third path 23 and the forward third path 28 are greater than or equal to the width of the aluminum foil 15.

[0089] When the squeegee 14 moves along the backward first path 21, two parts of the aluminum foil 15 are clamped at the first clamping station 11 and the second clamping station 12 by the first clamping mechanism 42 and the second clamping mechanism 43 respectively; when the squeegee 14 moves along the backward second path 22, the area between the two clamped parts of the aluminum foil 15 is moved to the scraping station 13 to the right; when the squeegee 14 moves along the backward third path 23, the first clamping mechanism 42 and the second clamping mechanism 43 maintain the clamping and limiting of the aluminum foil 15, so that the aluminum foil 15 is fixed at the current position, so as to facilitate scraping the positive electrode material on the aluminum foil 15 by the squeegee 14; when the squeegee 14 moves along the backward fourth path 24, the clamping of the aluminum foil 15 is released; when the squeegee 14 moves along the backward fifth path 25, the first clamping mechanism 42 and the second clamping mechanism 43 are reset to the left; when the squeegee 14 moves along the forward first path 26, two other parts of the aluminum foil 15 are clamped at the first clamping station 11 and the second clamping station 12 by the first clamping mechanism 42 and the second clamping mechanism 43 respectively; when the squeegee 14 moves along the forward second path 27, the area between the two other clamped parts of the aluminum foil 15 is moved to the scraping station 13 to the right; when the squeegee 14 moves along the forward third path 28, the first clamping mechanism 42 and the second clamping mechanism 43 maintain the clamping and limiting of the aluminum foil 15, so that the aluminum foil 15 is fixed at the current position, so as to facilitate scraping the positive electrode material on the aluminum foil 15 by the squeegee 14; when the squeegee 14 moves along the forward fourth path 29, the clamping of the aluminum foil 15 is released; when the squeegee 14 moves along the forward fifth path 31, the first clamping mechanism 42 and the second clamping mechanism 43 are reset to the left.

[0090] During the cyclic movement of the squeegee 14 along the backward path and the forward path, the positive electrode material at different positions of the aluminum foil 15 can be continuously scraped off on the premise of good positioning of the aluminum foil 15. The whole scraping process is efficient and stable, which is beneficial to ensuring the recovery efficiency of the positive electrode material.

[0091] In other embodiments, the above steps S7 to S8 can adopt the wet recovery process in the prior art to prepare lithium carbonate from the positive electrode material. The wet recovery process for preparing lithium carbonate from the positive electrode material requires the consumption of acids and oxidation reagents.

[0092] In this embodiment, preferably, step S7 includes:

[0093] Step S71: Press the positive electrode material into a sheet material, and a plurality of holes are distributed on the sheet material.

[0094] Step S72: Use the sheet material as the cathode of the electrolytic cell and the carbon rod as the anode of the electrolytic cell, and adopt the electrolytic reduction method to leach lithium ions into the electrolyte of the electrolytic cell.

[0095] Step S8 includes: extracting the electrolyte containing lithium ions, adding a precipitating agent containing carbonate radicals, and filtering to obtain a precipitate of lithium carbonate.

[0096] The above method extracts lithium from the recycled cathode material by means of electrolytic reduction. After the lithium ions are precipitated and filtered, the obtained precipitate is lithium carbonate, which is one of the raw materials for preparing the cathode material of lithium iron phosphate batteries. Compared with the wet recycling method, the above method does not use acids and oxidants, has less secondary pollution, and is more environmentally friendly. In addition, the above method presses the cathode material into a sheet material with holes (small holes), and the contact area between the sheet material and the electrolyte is larger, and the leaching efficiency of lithium ions is higher.

[0097] In a second aspect, referring to Figures 1 to 4 , this embodiment provides a recycling system for the cathode material of waste lithium iron phosphate batteries. This system incorporates the above method and includes a separation device and a pressing device. The separation device is used to separate and collect the cathode material on the aluminum foil 15, and the pressing device is used to press the cathode material into a sheet material with holes.

[0098] The separation device includes a support table 41, a first clamping mechanism 42, a second clamping mechanism 43, a scraping mechanism, and a material receiving mechanism.

[0099] The support table 41 plays a supporting role. Along its length direction ( Figure 2 the left-right direction shown), a first clamping station 11 and a second clamping station 12 are provided at intervals.

[0100] The first clamping mechanism 42 is arranged at the first clamping station 11.

[0101] The second clamping mechanism 43 is arranged at the second clamping station 12; the first clamping mechanism 42 and the second clamping mechanism 43 are respectively used to clamp two parts of the aluminum foil 15; the first clamping mechanism 42 and the second clamping mechanism 43 can move left or right synchronously.

[0102] The scraping mechanism includes a scraper 14, and the scraper 14 can move along the width direction of the support table 41 ( Figure 2 the front-back direction shown) to scrape off the cathode material on the aluminum foil 15.

[0103] The material receiving mechanism includes a material receiving hopper 451 arranged below the support table 41, and the material receiving hopper 451 is used to collect the cathode material.

[0104] The clamping and limiting of the aluminum foil 15 are achieved through the clamping actions of the first clamping mechanism 42 and the second clamping mechanism 43. At the same time, the first clamping mechanism 42 and the second clamping mechanism 43 can move left or right synchronously, realizing the conveying of the aluminum foil 15. Specifically, after the first clamping mechanism 42 and the second clamping mechanism 43 clamp the aluminum foil 15, they drive the aluminum foil 15 to move right, then release the aluminum foil 15, move left to reset, and then re-clamp the aluminum foil 15 to drive the aluminum foil 15 to move right, so as to scrape off the positive electrode materials at different positions on the aluminum foil 15 by the scraper 14. The scraped positive electrode materials fall into the material receiving hopper 451 and are collected.

[0105] There are two lifting blocks 441 arranged on the upper side of the scraper 14. The lifting blocks 441 are slidably connected with a guide rod 442, and the guide rod 442 is connected to the support table 41. As Figure 2 shown, the axis of the guide rod 442 is arranged along the width direction of the support table 41. Moving the lifting block 441 can move the scraper 14.

[0106] The first clamping mechanism 42 includes a first vertical plate 421, a first support plate 422, a first clamping plate 423, a first lifting ring 424, a first cross bar 425 and a guiding plate 426.

[0107] The first support plate 422 is fixed on the first vertical plate 421. A first groove is formed on the support table 41. Under the self-weight of the first vertical plate 421 and the first support plate 422, the lower side of the first support plate 422 is in sliding contact with the bottom of the first groove, and the upper side of the first support plate 422 can contact the lower side of the aluminum foil 15.

[0108] The first clamping plate 423 is located above the first support plate 422 and is longitudinally slidably connected to the first vertical plate 421. The lower side of the first clamping plate 423 can contact the upper side of the aluminum foil 15.

[0109] One end of the first lifting ring 424 is connected to the first clamping plate 423, and the other end is detachably connected to the first cross bar 425 by a screw.

[0110] One end of the first cross bar 425 is connected to the guiding plate 426, and the other end is connected to the lifting block 441. As Figure 2 shown, the lifting block 441 can drive the first cross bar 425 to move back and forth, and the first cross bar 425 can move left and right and up and down relative to the lifting block 441. Specifically, a moving block 443 is slidably connected left and right in the lifting block 441, and the first cross bar 425 is slidably connected up and down with the moving block 443. A spring 444 for moving the moving block 443 to the left is arranged between the moving block 443 and the lifting block 441.

[0111] The guiding plate 426 is fixedly arranged on the supporting platform 41; the guiding plate 426 is provided with guiding tracks for guiding the up-and-down or left-and-right movement of the first cross bar 425. Among them, the upward movement of the first cross bar 425 is realized by making the guiding tracks extend upward; the downward movement of the first cross bar 425 is realized by making the guiding tracks extend downward; the rightward movement of the first cross bar 425 is realized by setting an outward slope in the guiding tracks, that is, making the depth of the guiding tracks gradually decrease to give a reaction force to the right of the first cross bar 425, and the first cross bar 425 compresses the spring 444, thereby realizing the rightward movement of the first cross bar 425; the leftward movement of the first cross bar 425 is realized by setting an inward slope in the guiding tracks, that is, making the depth of the guiding tracks gradually increase, so that the first cross bar 425 moves leftward and resets under the action of the rightward restoring force of the spring 444. Keeping the up-and-down position and left-and-right position of the first cross bar 425 is realized by making the guiding tracks extend horizontally and keeping the depth of the guiding tracks unchanged.

[0112] The second clamping mechanism 43 includes a second vertical plate 431, a second support plate 432, a second clamping plate 433, a second hanging ring, and a second cross bar 434.

[0113] The second support plate 432 is fixed on the second vertical plate 431. A second groove is formed on the supporting platform 41. Under the self-weight of the second vertical plate 431 and the second support plate 432, the lower side of the second support plate 432 is in sliding contact with the bottom of the second groove, and the upper side of the second support plate 432 can be in contact with the lower side of the aluminum foil 15.

[0114] The second clamping plate 433 is located above the second support plate 432 and is longitudinally slidably connected to the second vertical plate 431. The lower side of the second clamping plate 433 can be in contact with the upper side of the aluminum foil 15.

[0115] One end of the second hanging ring is connected to the second clamping plate 433, and the other end is detachably connected to the second cross bar 434 by screws.

[0116] One end of the second cross bar 434 is connected to the first cross bar 425, and the second cross bar 434 moves with the first cross bar 425. The shape of the second cross bar 434 is set as required.

[0117] In this embodiment, the guiding tracks include a rear downward pressing guide rail 51, a rear rightward moving guide rail 52, a rear holding guide rail 53, a rear upward moving guide rail 54, a rear leftward moving guide rail 55, a front downward pressing guide rail 56, a front rightward moving guide rail 57, a front holding guide rail 58, a front upward moving guide rail 59, and a front leftward moving guide rail 61 that are connected in sequence. Among them, the rear leftward moving guide rail 55 and the front downward pressing guide rail 56 are connected by an upward moving transfer guide rail 62, and the front leftward moving guide rail 61 and the rear downward pressing guide rail 51 are connected by a downward moving transfer guide rail 63.

[0118] Each region of the above guiding track corresponds to the functions and purposes of the corresponding backward path or forward path respectively. Specifically:

[0119] The rear downward pressing guide rail 51 extends downward, causing the first cross bar 425 to drive the first clamping plate 423 and the second clamping plate 433 to move downward along their trajectories, so that when the scraper 14 moves along the backward first path 21, two parts of the aluminum foil 15 are clamped by the first clamping mechanism 42 and the second clamping mechanism 43 at the first clamping station 11 and the second clamping station 12;

[0120] The depth of the rear rightward moving guide rail 52 gradually decreases, causing the first cross bar 425 to drive the first clamping plate 423 and the second clamping plate 433 to move rightward, so that when the scraper 14 moves along the backward second path 22, the area between the two clamped parts of the aluminum foil 15 is moved rightward to the scraping station 13;

[0121] The rear holding guide rail 53 extends horizontally and its depth remains equal to the minimum depth of the rear rightward moving guide rail 52. At this time, the first cross bar 425 and the lifting block 441 move synchronously (without relative movement between them), so that when the scraper 14 moves along the backward third path 23, the first clamping mechanism 42 and the second clamping mechanism 43 maintain the clamping and limiting of the aluminum foil 15, fixing the aluminum foil 15 in the current position to facilitate scraping off the positive electrode material on the aluminum foil 15 by the scraper 14;

[0122] The rear upward moving guide rail 54 extends upward, causing the first cross bar 425 to drive the first clamping plate 423 and the second clamping plate 433 to move upward along their trajectories, so that when the scraper 14 moves along the backward fourth path 24, the clamping of the aluminum foil 15 is released;

[0123] The depth of the rear leftward moving guide rail 55 gradually increases, causing the first cross bar 425 to move leftward under the action of the restoring force of the spring 444, so that when the scraper 14 moves along the backward fifth path 25, the first clamping mechanism 42 and the second clamping mechanism 43 move leftward to reset;

[0124] The front downward pressing guide rail 56 extends downward, causing the first cross bar 425 to drive the first clamping plate 423 and the second clamping plate 433 to move downward along their trajectories, so that when the scraper 14 moves along the forward first path 26, two other parts of the aluminum foil 15 are clamped by the first clamping mechanism 42 and the second clamping mechanism 43 at the first clamping station 11 and the second clamping station 12 respectively;

[0125] The depth of the front rightward moving guide rail 57 gradually decreases, causing the first cross bar 425 to drive the first clamping plate 423 and the second clamping plate 433 to move rightward, so that when the scraper 14 moves along the forward second path 27, the area between the two other clamped parts of the aluminum foil 15 is moved rightward to the scraping station 13;

[0126] The forward holding guide rail 58 extends horizontally and its depth is kept equal to the minimum depth of the forward rightward moving guide rail 57. At this time, the first cross bar 425 and the hoisting block 441 move synchronously (without relative movement between them), so that when the scraping knife 14 moves along the forward third path 28, the first clamping mechanism 42 and the second clamping mechanism 43 can keep clamping and limiting the aluminum foil 15, fixing the aluminum foil 15 in the current position, so as to facilitate scraping off the positive electrode material on the aluminum foil 15 by the scraping knife 14;

[0127] The forward upward moving guide rail 59 extends upward, causing the first cross bar 425 to drive the first clamping plate 423 and the second clamping plate 433 to move upward along their trajectories, so as to release the clamping of the aluminum foil 15 when the scraping knife 14 moves along the forward fourth path 29;

[0128] The depth of the forward leftward moving guide rail 61 gradually increases, causing the first cross bar 425 to move leftward under the reset force of the spring 444, so that when the scraping knife 14 moves along the forward fifth path 31, the first clamping mechanism 42 and the second clamping mechanism 43 move leftward to reset.

[0129] It can be understood that the total distance by which the rear upward moving guide rail 54 and the upward moving transfer guide rail 62 move the first cross bar 425 upward should be equal to the total distance by which the downward moving transfer guide rail 63 and the rear downward pressing guide rail 51 move the first cross bar 425 downward; this embodiment does not limit the driving method for moving the first cross bar 425 along the upward moving transfer guide rail 62 and the downward moving transfer guide rail 63.

[0130] The pressing device includes a fixed frame 67, an air supply pipe 68 and a movable enclosure 69.

[0131] The fixed frame 67 is fixedly arranged. The fixed frame 67 is generally in a T shape, and an air inlet hole 66 is arranged on the vertical part of the fixed frame 67. The air inlet hole 66 is connected to the air supply pipe 68.

[0132] The air supply pipe 68 is connected to the air inlet hole 66 and is used to convey hot air flow at 45° - 55° to the air inlet hole 66.

[0133] The movable enclosure 69 is arranged to be movable left and right. The movable enclosure 69 is slidably connected to the fixed frame 67. The movable enclosure 69 and the fixed frame 67 can jointly define a space to form a cavity 64. The cavity 64 can be communicated with the material receiving hopper 451, so as to facilitate the positive electrode material collected by the funnel to enter the cavity 64. An extension rod 65 is arranged on one side of the movable enclosure 69. The extension rod 65 is located in the cavity 64 and can block the air inlet hole 66.

[0134] After the positive electrode material collected by the receiving funnel enters the cavity 64, the hot air in the air supply pipe 68 enters the cavity 64 through the air inlet hole 66, keeping the viscous material in the positive electrode material in a relatively soft state. This is conducive to compacting the positive electrode material into a sheet material, and the sheet material is not easily loose. The movable surrounding plate 69 is moved to the left, and the extension rod 65 is inserted into the air inlet hole 66 to block the air inlet hole 66. The movable surrounding plate 69 and the fixed frame 67 cooperate to compact the positive electrode material into a sheet material with holes. After the movable surrounding plate 69 is moved to the right and separated from the vertical part of the fixed frame 67, the sheet material can naturally fall off the pressing device. In addition, before the extension rod 65 is inserted into the air inlet hole 66 to block the air inlet hole 66, the hot air in the air supply pipe 68 enters the cavity 64 through the air inlet hole 66, which can also prevent some powdery positive electrode material from overflowing outside the air inlet hole 66.

[0135] This embodiment further includes a flattening station 71 and a jet head 72.

[0136] The flattening station 71 is arranged on the left side of the first clamping station 11 and the second clamping station 12, and the width of the support table 41 in the area of the flattening station 71 is slightly smaller than the width of the aluminum foil 15.

[0137] The jet is connected to the air supply pipe 68. A plurality of jet heads 72 are uniformly arranged obliquely above the flattening station 71 in the width direction of the support table 41, and the jet direction of the jet heads 72 is obliquely downward towards the flattening station 71.

[0138] By blowing hot air onto the aluminum foil 15 at the flattening station 71 through the jet heads 72, the air flow can be used to smooth the aluminum foil 15 to facilitate the subsequent separation of the positive electrode material, and the positive electrode material can be heated to make the viscous substance in the positive electrode material softer for easy scraping.

[0139] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A recycling system for the cathode material of waste lithium iron phosphate batteries, characterized in that, Comprising: A support table, on which a first clamping station and a second clamping station are arranged at intervals along its length direction; A first clamping mechanism, arranged at the first clamping station; A second clamping mechanism, arranged at the second clamping station; the first clamping mechanism and the second clamping mechanism are respectively used for clamping two parts of the aluminum foil; the first clamping mechanism and the second clamping mechanism can move left or right synchronously; A scraping mechanism, including a scraper; A material receiving mechanism, including a material receiving hopper arranged below the support table for collecting the positive electrode material; Two lifting blocks are arranged on the upper side of the scraper, and the lifting blocks are slidably connected with a guide rod, and the axis of the guide rod is arranged along the width direction of the support table; The first clamping mechanism includes: A first vertical plate; A first support plate, fixed on the first vertical plate, a first groove is formed on the support table, the lower side of the first support plate is in sliding contact with the bottom of the first groove, and the upper side of the first support plate can contact the lower side of the aluminum foil; A first clamping plate, located above the first support plate and longitudinally slidably connected to the first vertical plate, and the lower side of the first clamping plate can contact the upper side of the aluminum foil; A first lifting ring, one end of which is connected to the first clamping plate and the other end is connected to a first cross bar; A first cross bar, one end of which is connected to a guide plate and the other end is connected to the lifting block; the lifting block can drive the first cross bar to move back and forth, and the first cross bar can move left and right and up and down relative to the lifting block; A guide plate, fixedly arranged on the support table; the guide plate is provided with a guide track for guiding the first cross bar to move up and down or left and right; the guide track includes a rear downward pressing guide rail, a rear rightward moving guide rail, a rear holding guide rail, a rear upward moving guide rail, a rear leftward moving guide rail, a front downward pressing guide rail, a front rightward moving guide rail, a front holding guide rail, a front upward moving guide rail, and a front leftward moving guide rail which are connected in sequence, wherein, the rear leftward moving guide rail and the front downward pressing guide rail are connected by an upward moving transfer guide rail, and the front leftward moving guide rail and the rear downward pressing guide rail are connected by a downward moving transfer guide rail; Also included: A fixing frame, fixedly arranged, the fixing frame is in a T shape, and an air inlet hole is arranged on the vertical part of the fixing frame; An air supply pipeline, connected to the air inlet hole, for conveying hot air flow at 45° - 55° to the air inlet hole; A movable enclosure, arranged to be movable left and right, the movable enclosure is slidably connected with the fixing frame, the movable enclosure can jointly define a space with the fixing frame to form a cavity, and the cavity can be communicated with the material receiving hopper; an extension rod is arranged on one side of the movable enclosure, and the extension rod is located in the cavity and can block the air inlet hole; A flattening station, arranged on the left side of the first clamping station and the second clamping station, and the width of the area of the support table located at the flattening station is slightly smaller than the width of the aluminum foil; A plurality of jet heads connected to the air supply pipeline, arranged uniformly along the width direction of the support table obliquely above the flattening station, and the jet direction of the jet heads is obliquely downward towards the flattening station.

2. The recycling system for the cathode material of waste lithium iron phosphate batteries according to claim 1, wherein The second clamping mechanism includes: A second vertical plate; The second supporting plate is fixed on the second vertical plate. A second groove is formed in the supporting table. The lower side of the second supporting plate is in sliding contact with the bottom of the second groove, and the upper side of the second supporting plate can be in contact with the lower side of the aluminum foil. The second clamping plate is located above the second supporting plate and is longitudinally slidably connected to the second vertical plate. The lower side of the second clamping plate can be in contact with the upper side of the aluminum foil. The second hanging ring has one end connected to the second clamping plate and the other end connected to the second cross bar. One end of the second cross bar is connected to the first cross bar; the second cross bar moves along with the first cross bar.

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