A synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries

Abstract

The present application relates to the technical field of waste lithium battery recycling, and particularly relates to a lithium battery positive and negative electrode sheet synchronous classification conveying device, which comprises a rack, a roll core classification conveying belt assembly is arranged on the rack, the roll core classification conveying belt assembly comprises a preheating section, a classification section and a heating section, the preheating section, the classification section and the heating section are each provided with a heating assembly for heating a roll core material layer and a negative pressure adsorption hole for adsorbing the roll core material layer and collecting electrolyte volatilized from the roll core material layer, the roll core material layer comprises positive electrode sheets, negative electrode sheets and separators which are arranged in a superimposed manner, the classification section is arranged in a binary tree structure, the feed end of the classification section is connected to the preheating section, and each discharge end of the classification section is connected to one heating section in correspondence. The lithium battery positive and negative electrode sheet synchronous classification conveying device can remove most of the electrolyte on the roll core material layer while achieving efficient and high-precision layered classification of the lithium battery roll core material layer, thereby improving the efficiency and the purity of the product.

Description

Technical Field

[0001] This invention relates to the field of lithium battery sorting and conveying technology, and specifically to a lithium battery positive and negative electrode synchronous sorting and conveying device. Background Technology

[0002] With the widespread application of lithium batteries in new energy vehicles, electronic products, and other fields, the recycling and processing of waste lithium batteries has become an important issue. Lithium battery cells consist of positive electrode plates, negative electrode plates, separators, and electrolytes. The positive and negative electrode plates contain valuable metals such as nickel, cobalt, and lithium, giving them high recycling value. Currently, the industry commonly uses two recycling methods: one involves disassembling the lithium battery casing, crushing and roasting the entire core together to remove separator paper and some organic matter, and then screening and separating it to obtain a mixture of positive and negative electrode powder, copper powder, and aluminum powder; the other involves classifying and storing different components of the lithium battery during disassembly, as illustrated by the Chinese invention patent with authorization announcement number CN110137590B, entitled "A Waste Cylindrical Lithium Battery Disassembly and Recycling Equipment." The first method not only produces products with high impurity content but also commonly has excessive fluoride content, significantly impacting subsequent processing. While the second method increases costs and reduces efficiency compared to the first, it solves the problem of the difficulty in subsequent sorting and recycling. Regarding the second method, current lithium battery recycling and sorting equipment still suffers from low sorting accuracy and slow efficiency. The purity of the processed products after sorting is also low, thus failing to increase production capacity and generate more profits. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries that takes into account sorting accuracy, efficiency and purity of sorted products.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries, including a frame, on which a core sorting conveyor belt assembly is provided. The core sorting conveyor belt assembly includes a preheating section, a sorting section, and a heating section. The preheating section, sorting section, and heating section are all provided with heating components for heating the core material layer and negative pressure adsorption holes for adsorbing the core material layer and collecting the electrolyte volatilized from the core material layer. The core material layer includes positive electrode sheets, negative electrode sheets, and a separator stacked together. The heating temperature range of the heating components in the preheating section is 50℃~70℃, the heating temperature range of the heating components in the sorting section is 50℃~90℃, and the heating temperature range of the heating components in the heating section is 70℃~90℃. The sorting section is arranged in a binary tree structure. The feed end of the sorting section is connected to the preheating section, and each discharge end of the sorting section is connected to a corresponding heating section.

[0005] Furthermore, it also includes a controller, which is mounted on the frame. Each branch of the sorting section is equipped with a thickness detection component for detecting the thickness of the core material layer. The heating component, negative pressure adsorption hole, and thickness detection component are all connected to the controller.

[0006] Furthermore, the core sorting conveyor belt assembly includes three or more sets of vacuum conveyor belts mounted on the frame, with negative pressure adsorption holes on the vacuum conveyor belts. The three or more sets of vacuum conveyor belts are arranged in a binary tree structure in the sorting section, and the heating component includes conveyor belt heaters mounted on the vacuum conveyor belts.

[0007] Furthermore, the frame is equipped with a movable mounting frame and a core material layer guide plate. The vacuum conveyor belt is mounted on the mounting frame, and the core material layer guide plate is used to guide the core material layer out of the vacuum conveyor belt.

[0008] Furthermore, the vacuum conveyor belt is equipped with a protective cover, and the side wall of the protective cover is provided with air inlets and an insulation layer.

[0009] Furthermore, it also includes a mobile discharge conveyor belt and a core material layer sorting conveyor line. The mobile discharge conveyor belt is movably mounted on the frame and connected to the controller. The discharge end of each heating section is connected to the feed end of a set of mobile discharge conveyor belts. The discharge end of the mobile discharge conveyor belt can be selectively connected to three or more core material layer sorting conveyor lines. The mobile discharge conveyor belt is used to transport the sorted core material layers to the corresponding core material layer sorting conveyor lines.

[0010] Furthermore, the feed end of the mobile discharge conveyor belt is hinged to the frame, and the frame is equipped with a drive component that drives the discharge end of the mobile discharge conveyor belt to switch between three or more core material layer sorting conveyor lines.

[0011] Furthermore, it also includes a tunnel heating assembly, a core material layer sorting and conveying line including a diaphragm conveying line, and a positive electrode sheet conveying line and a negative electrode sheet conveying line that run through the tunnel heating assembly.

[0012] Furthermore, the tunnel heating assembly includes a tunnel shell, with an inlet and an outlet at each end of the tunnel shell. The positive electrode conveying line and the negative electrode conveying line enter the tunnel from the inlet and exit the tunnel from the outlet. A heating module is installed inside the tunnel shell, and a negative pressure exhaust pipe is installed on the side wall of the tunnel shell. The heating module is connected to the controller.

[0013] Furthermore, the sidewalls of the tunnel shell are equipped with temperature sensors and nitrogen inlet valves, both of which are connected to the controller.

[0014] The beneficial effects of this invention are as follows: A lithium battery positive and negative electrode synchronous sorting and conveying device, wherein the core sorting conveyor assembly includes a preheating section, a sorting section, and a heating section in sequence along the feeding direction. As the names suggest, the main work of the three stages is to preheat, sort, and heat the conveyed core material in sequence. The core material has a multi-layer structure, including at least three different core material layers: positive electrode sheet, negative electrode sheet, and separator. During operation, the core sorting conveyor assembly continuously conveys the disassembled lithium battery core material. The core material is flatly adsorbed onto the surface of the core sorting conveyor assembly under the adsorption of negative pressure adsorption holes. When passing through the preheating section, the heating component controls the heating temperature within the range of 50℃ to 70℃ to preheat the core material layers. Within this temperature range, the separator will not be significantly deformed. After entering the sorting section, the conveyor structure is arranged in a binary tree structure. When the number of core material layers is greater than or equal to 2, the core material passes through the section each time. At the designated point, the conveyor belts split into two branches under the relative adsorption effect of the two belts. After passing through multiple nodes, the originally stacked conveyed core material layers are separated into independent core material layers for separate transport. Finally, after the core material layers are sorted, the heating components in the sorting and heating sections control the heating temperature within the range of 50℃~70℃ to heat the diaphragm, and the heating components control the heating temperature within the range of 70℃~90℃ to heat the positive and negative electrode sheets. The purpose of preheating and heating is to accelerate the evaporation of electrolyte on the core material layers and to render the organic binding material between the core material layers ineffective through heating, which is conducive to the separation of material layers. When the temperature is maintained within the range of 70℃~90℃, the electrolyte evaporation rate is the fastest. The negative pressure adsorption holes are used to adsorb the core material layers and quickly remove the evaporating electrolyte from the core material layers, improving separation efficiency and avoiding contamination. Continuous and rapid collection of the evaporating electrolyte can also increase the recycling rate. The lithium battery positive and negative electrode synchronous sorting and conveying device of the present invention can achieve efficient and high-precision layering and sorting of lithium battery core material layers, while removing most of the electrolyte on the core material layer, so that the water content of the core material layer is less than 2%. The positive electrode, negative electrode and separator can be discharged separately, which is convenient for collection. At the same time, it can eliminate the drying step, improve efficiency, and directly crush the positive and negative electrode sheets separately. The resulting positive electrode powder has an average lithium content of more than 3.3% and a copper powder purity of more than 95%, thereby increasing the product value and creating more profit. Attached Figure Description

[0015] Figure 1 A schematic diagram of a synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries;

[0016] Figure 2 Another schematic diagram of a synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries;

[0017] Figure 3This is a schematic diagram of the structure of a mobile discharge conveyor belt;

[0018] Figure 4 This is a schematic diagram of the structure of a vacuum conveyor belt;

[0019] Figure 5 This is a partial cross-sectional view of a vacuum conveyor belt.

[0020] Figure 6 This is a schematic diagram of the tunnel heating assembly.

[0021] Figure 7 This is another structural schematic diagram of the tunnel heating assembly;

[0022] Label Explanation:

[0023] 1. Frame; 11. Mounting frame; 12. Core material layer guide plate; 13. Drive assembly; 2. Core sorting conveyor belt assembly; 21. Vacuum conveyor belt; 22. Protective cover; 221. Air inlet; 3. Preheating section; 4. Sorting section; 5. Heating section; 6. Heating assembly; 7. Negative pressure adsorption hole; 8. Thickness detection assembly; 9. Mobile discharge conveyor belt; 10. Core material layer sorting conveyor line; 101. Tunnel heating assembly; 1010. Tunnel shell; 1011. Feed inlet; 1012. Discharge outlet; 1013. Heating module; 1014. Negative pressure exhaust duct; 1015. Temperature sensor; 1016. Nitrogen inlet valve. Detailed Implementation

[0024] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0025] Please refer to Figures 1 to 7 As shown, a synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries according to the present invention includes a frame 1, on which a core sorting conveyor belt assembly 2 is provided. The core sorting conveyor belt assembly 2 includes a preheating section 3, a sorting section 4, and a heating section 5. The preheating section 3, the sorting section 4, and the heating section 5 are all provided with heating components 6 for heating the core material layer and negative pressure adsorption holes 7 for adsorbing the core material layer and collecting the electrolyte volatilized from the core material layer. The core material layer includes positive electrode sheets, negative electrode sheets, and a separator stacked together. The heating temperature range of the heating component 6 in the preheating section 3 is 50℃~70℃, the heating temperature range of the heating component 6 in the sorting section 4 is 50℃~90℃, and the heating temperature range of the heating component 6 in the heating section 5 is 70℃~90℃. The sorting section 4 is arranged in a binary tree structure. The feeding end of the sorting section 4 is connected to the preheating section 3, and each discharging end of the sorting section 4 is connected to a corresponding heating section 5.

[0026] The working principle described above is as follows: The lithium battery positive and negative electrode synchronous sorting and conveying device sequentially includes a preheating section 3, a sorting section 4, and a heating section 5 along the feeding direction of the core sorting conveyor assembly 2. As the names suggest, the main tasks of the three stages are to preheat, sort, and heat the conveyed core material in sequence. The core material has a multi-layer structure, including at least three different core material layers: positive electrode sheet, negative electrode sheet, and separator. During operation, the core sorting conveyor assembly 2 continuously conveys the unwound lithium battery core material. The core material is flatly adsorbed onto the surface of the core sorting conveyor assembly 2 under the adsorption of the negative pressure adsorption holes 7. When passing through the preheating section 3, the heating component 6 controls the heating temperature within the range of 50℃ to 70℃ to preheat the core material layer. Within this temperature range, the separator will not be significantly deformed. After entering the sorting section 4, the conveyor structure arranged in a binary tree structure is used. When the number of core material layers is greater than or equal to 2, the core material passes through each section. At each node, the conveyor belts split into two branches due to the relative adsorption between them. After passing through multiple nodes, the originally stacked core material layers are separated into independent core material layers for separate transport. Finally, after the core material layers are sorted, the heating components 6 are used in both the sorting section 4 and the heating section 5 to control the heating temperature within the range of 50℃ to 70℃ to heat the diaphragm. The heating components 6 are also used to control the heating temperature within the range of 70℃ to 90℃ to heat the positive and negative electrode sheets. The purpose of preheating and heating is to accelerate the evaporation of electrolyte on the core material layers and to render the organic binding material between the core material layers ineffective through heating, which is beneficial for the separation of the material layers. The electrolyte evaporation rate is fastest when the temperature is maintained within the range of 70℃ to 90℃. The negative pressure adsorption holes 7 are used to adsorb the core material layers and quickly remove the evaporating electrolyte from the core material layers, improving the separation efficiency and avoiding contamination. The continuous and rapid collection of the evaporating electrolyte can also increase the recycling rate.

[0027] The beneficial effects described above are as follows: The main components of lithium battery electrolyte include lithium salts and organic solvents, which are highly volatile. LiPF6 is the most common lithium salt, and the organic solvents are mainly carbonate solvents and organic ether solvents. Under controlled temperatures, the evaporation of the electrolyte can be accelerated. The synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries can achieve efficient and high-precision layering and sorting of lithium battery core material layers, while removing most of the electrolyte from the core material layer, making the water content of the core material layer less than 2%. Positive electrode sheets, negative electrode sheets, and separators can be discharged separately, which is convenient for collection and can eliminate the drying step, improve efficiency, and directly crush the positive and negative electrode sheets separately. The resulting positive electrode powder has an average lithium content of more than 3.3% and a copper powder purity of more than 95%, thereby increasing the product value and creating more profits.

[0028] Optionally, a controller is also included, which is mounted on the frame 1. Each branch of the classification section 4 is equipped with a thickness detection component 8 for detecting the thickness of the core material layer. The heating component 6, the negative pressure adsorption hole 7, and the thickness detection component 8 are all connected to the controller.

[0029] The beneficial effects described above are: the thickness detection component 8 is used to detect whether the core material layer passing through its identification area is a positive electrode sheet, a negative electrode sheet or a separator, and then sends the detection result to the controller. The controller sends different instructions to the heating component 6 according to the type of core material layer to control the corresponding heating temperature.

[0030] Optionally, the core sorting conveyor belt assembly 2 includes three or more sets of vacuum conveyor belts 21 arranged on the frame 1. The vacuum conveyor belts 21 are provided with negative pressure adsorption holes 7. The three or more sets of vacuum conveyor belts 21 are arranged in a binary tree structure in the sorting section 4. The heating component 6 includes conveyor belt heaters arranged on the vacuum conveyor belts 21.

[0031] The beneficial effects described above are: the vacuum conveyor belt 21 firmly adsorbs the core material layer onto the surface for conveying, and at the same time, the conveyor belt heater is used to heat the conveyor belt body as a whole or locally as needed, and the conveyor belt body then transfers the heat to the core material layer for preheating or heating.

[0032] Optionally, the frame 1 is provided with a movable mounting frame 11 and a core material layer guide plate 12. The vacuum conveyor belt 21 is mounted on the mounting frame 11, and the core material layer guide plate 12 is used to guide the core material layer on the vacuum conveyor belt 21 to be discharged.

[0033] The beneficial effects described above are: the installation position of the vacuum conveyor belt 21 on the frame 1 can be adjusted by the mounting frame 11, so that its arrangement and angle can be designed as needed, which has good versatility. After the vacuum conveyor belt 21 is fixed, the core material layer guide plate 12 is installed at its discharge position. The core material layer guide plate 12 is used to block and scrape off the core material layer to complete the discharge.

[0034] Optionally, the vacuum conveyor belt 21 is covered with a protective cover 22, and the side wall of the protective cover 22 is provided with an air inlet 221 and a heat insulation layer.

[0035] The beneficial effects described above are: the protective cover 22 serves to keep the room warm and prevent the emission of harmful gases, and it also has the functions of saving energy and improving gas collection efficiency.

[0036] Optionally, it also includes a mobile discharge conveyor belt 9 and a core material layer sorting conveyor line 10. The mobile discharge conveyor belt 9 is movably mounted on the frame 1 and connected to the controller. The discharge end of each heating section 5 is connected to the feed end of a set of mobile discharge conveyor belts 9. The discharge end of the mobile discharge conveyor belt 9 can be selectively connected to three or more core material layer sorting conveyor lines 10. The mobile discharge conveyor belt 9 is used to transport the sorted core material layers to the corresponding core material layer sorting conveyor line 10.

[0037] The beneficial effects described above are: the function of using the mobile discharge conveyor belt 9 is to guide and transport the core material layers to different conveyor lines according to their type, thereby completing the classified synchronous conveying and processing.

[0038] Optionally, the feed end of the mobile discharge conveyor belt 9 is hinged to the frame 1, and the frame 1 is provided with a drive assembly 13 that drives the discharge end of the mobile discharge conveyor belt 9 to switch between three or more core material layer classification conveyor lines 10 for discharge.

[0039] The beneficial effect described above is that the drive assembly 13 drives the discharge end of the mobile discharge conveyor belt 9 to slide on the frame 1, thereby aligning the discharge end of the mobile discharge conveyor belt 9 with the different core material layer classification conveyor line 10 for classification and transmission.

[0040] Optionally, it also includes a tunnel heating assembly 101, and the core material layer sorting and conveying line 10 includes a diaphragm conveying line and a positive electrode conveying line and a negative electrode conveying line that pass through the tunnel heating assembly 101.

[0041] The beneficial effects described above are: the tunnel heating assembly 101 is used to simultaneously perform secondary heating on the sorted positive and negative electrode sheets in a semi-enclosed environment, so that the electrolyte on the electrode sheets is completely removed and the water content of the electrode sheets is reduced again, so that positive and negative electrode sheets with water content that meets the requirements for breaking are obtained under safe conditions.

[0042] Optionally, the tunnel heating assembly 101 includes a tunnel shell 1010, with an inlet 1011 and an outlet 1012 at both ends of the tunnel shell 1010. The positive electrode conveying line and the negative electrode conveying line enter the tunnel through the inlet 1011 and exit the tunnel through the outlet 1012. A heating module 1013 is provided inside the tunnel shell 1010, and a negative pressure exhaust pipe 1014 is provided on the side wall of the tunnel shell 1010. The heating module 1013 is connected to the controller.

[0043] The beneficial effects described above are: the tunnel shell 1010 has a heat preservation function, the heating module 1013 controls the heating temperature inside the tunnel, and the negative pressure exhaust pipe 1014 collects and removes the volatile electrolyte.

[0044] Optionally, the sidewall of the tunnel housing 1010 is provided with a temperature sensor 1015 and a nitrogen inlet valve 1016, both of which are connected to the controller.

[0045] The beneficial effects described above are as follows: when electrode burning occurs inside the cavity, the temperature detector installed in the tunnel senses the over-temperature alarm and triggers the opening of the nitrogen inlet valve 1016. The matching nitrogen generator and gas storage tank provide nitrogen, which isolates the oxygen inside the cavity for a short time, thereby achieving the purpose of flame retardant fire extinguishing.

[0046] Please refer to Figures 1 to 7 As shown, Embodiment 1 of the present invention is: a synchronous sorting and conveying device for positive and negative electrode sheets of lithium batteries, including a frame 1, on which a core sorting conveyor belt assembly 2 is provided. The core sorting conveyor belt assembly 2 includes a preheating section 3, a sorting section 4, and a heating section 5. The preheating section 3, the sorting section 4, and the heating section 5 are all provided with heating components 6 for heating the core material layer and negative pressure adsorption holes 7 for adsorbing the core material layer and collecting the electrolyte volatilized from the core material layer. Before use, the negative pressure value range of the negative pressure adsorption holes 7 is adjusted. It is only necessary to ensure that the adsorption is fixed and the material layer is not damaged. The core material layer includes a positive electrode sheet, a negative electrode sheet and a separator stacked on top of each other. The heating temperature range of the heating component 6 in the preheating section 3 is 50℃~70℃, the heating temperature range of the heating component 6 in the sorting section 4 is 50℃~90℃, and the heating temperature range of the heating component 6 in the heating section 5 is 70℃~90℃. The sorting section 4 is arranged in a binary tree structure. The feed end of the sorting section 4 is connected to the preheating section 3, and each discharge end of the sorting section 4 is connected to a corresponding heating section 5.

[0047] A binary tree structure is a tree-like structure where each node has at most two child nodes, called the left child and the right child. It can be classified as a full binary tree, a complete binary tree, etc. The binary tree structure "branches into two branches each time," making it efficient in sorting, searching, and path planning scenarios. It may also be broadly referred to as a "binary branch graph." In this embodiment, the core sorting conveyor belt assembly 2 includes a main conveyor belt at the bottom and three branch conveyor belts arranged sequentially upwards. The main conveyor belt and the second branch conveyor belt from the top use their upward-facing sides as the adsorption and heating surfaces for the core material layers, while the other two use their downward-facing sides as the adsorption and heating surfaces for the core material layers. They are arranged opposite each other, allowing the core material layers to be sorted through simultaneous adsorption from above and below. The spacing between the two opposite conveyor belts is adjustable.

[0048] The system also includes a controller mounted on frame 1. The controller contains a PLC control chip. Each branch of classification section 4 is equipped with a thickness detection component 8 for detecting the thickness of the core material layer. The heating component 6, negative pressure adsorption holes 7, and thickness detection component 8 are all connected to the controller. The thickness detection component 8 can be a rangefinder, positioned facing the main conveyor belt and branch conveyor belts. Since the thicknesses of the positive electrode, negative electrode, and separator in the core material layer differ, the rangefinder detects distance changes as the core material layer passes and sends the changes to the controller. The controller calculates the thickness of the core material layer on each branch and determines whether it is a positive electrode, negative electrode, or separator, or a combination of two or three layers. Then, it sends commands to the heating component 6 on each branch to control its heating temperature, and can also adjust the adsorption force of the negative pressure adsorption holes 7 according to the material thickness. To protect components from overheating, the device can be equipped with a heat insulation layer on the outside of sensors and other components, or a high-temperature resistant sensor can be customized as needed.

[0049] The core sorting conveyor belt assembly 2 includes three or more sets of vacuum conveyor belts 21 mounted on the frame 1. Each vacuum conveyor belt 21 has negative pressure adsorption holes 7. The three or more sets of vacuum conveyor belts 21 are arranged in a binary tree structure within the sorting section 4. The heating assembly 6 includes conveyor belt heaters mounted on the vacuum conveyor belts 21. Common conveyor belt heaters include electric heating tubes, far-infrared heaters, and hot air circulation devices. These heating elements transfer heat energy to the conveyor belt or material in different ways to achieve the heating target. In this embodiment, an electric heating tube is selected as the conveyor belt heater. Electric heating tubes convert electrical energy into heat energy and transfer it to the conveyor belt. They have the advantages of stable heating and fast response speed, and are suitable for various production lines requiring temperature control, such as food processing, coating, and printing. The vacuum conveyor belt 21 includes a drive shaft, a driven shaft, a conveyor belt body, and a vacuum box. Both the drive shaft and the driven shaft are rotatably mounted on the frame 1. The conveyor belt body is fitted onto the drive shaft and the driven shaft. Circular negative pressure adsorption holes 7 are arranged on the surface of the conveyor belt body. The vacuum box and heating elements are located inside the conveyor belt body. The vacuum box communicates with the negative pressure adsorption holes 7 and is connected to a vacuum generator via a vacuum pipe. This allows for the recovery and processing of the volatile electrolyte (or gaseous substances) collected by negative pressure adsorption, or its introduction into supporting equipment for resource reuse. The heat energy can also be used by other equipment, demonstrating energy conservation and environmental protection. The heating elements and the vacuum box are alternately spaced along the conveying direction inside the conveyor belt body. The frame 1 is equipped with a movable mounting bracket 11 and a core material layer guide plate 12. The frame 1 has a track and a locking groove. The mounting bracket 11 is slidably connected to the track and fixed by fasteners. The core material layer guide plate 12 is fastened to the frame 1 by fasteners. The core material layer guide plate 12 can be a flat plate or an arc-shaped plate, used to guide the core material layer out of the vacuum conveyor belt 21. During installation, one side of the core material layer guide plate 12 is pressed against the surface of the vacuum conveyor belt 21, and when a core material layer passes by, it will be scraped off. A high-temperature resistant elastic layer can be provided on the side of the core material layer guide plate 12 that abuts against the surface of the vacuum conveyor belt 21 to prevent scratching the core material layer and protect the vacuum conveyor belt 21. The vacuum conveyor belt 21 is covered by a protective cover 22. The side wall of the protective cover 22 has an air inlet 221 and an insulation layer. The protective cover 22 is transparent, and the insulation layer uses commercially available fire-resistant insulation materials to reduce heat loss.

[0050] It also includes a mobile discharge conveyor belt 9 and a core material layer sorting conveyor line 10. The mobile discharge conveyor belt 9 is movably mounted on the frame 1 and connected to the controller. The discharge end of each heating section 5 is connected to the feed end of a set of mobile discharge conveyor belts 9. The discharge end of the mobile discharge conveyor belt 9 can be selectively connected to three or more core material layer sorting conveyor lines 10. The mobile discharge conveyor belt 9 is used to transport the sorted core material layers to the corresponding core material layer sorting conveyor line 10. The frame 1 is equipped with a beam with a slide rail. The mobile discharge conveyor belt 9 moves within the slide rail via a slide block. It can be driven by a motor or by a motor through a screw. When using screw drive, the infeed end of the mobile discharge conveyor belt 9 adopts a rotating base, which is hinged to the frame 1. A support frame is provided on the rotating base, and the infeed end of the mobile discharge conveyor belt 9 has a sliding groove that is slidably connected to the support frame, allowing for adaptive sliding as the discharge end of the conveyor belt rotates. The discharge end of the conveyor belt is supported by a beam, which is slidably connected to a slide rail on the beam. A motor on the beam drives the discharge end of the mobile discharge conveyor belt 9 to switch between three or more core material layer sorting conveyor lines 10. The motor is screwed to the discharge end of the conveyor belt via a screw, thereby driving its horizontal oscillation.

[0051] It also includes a tunnel heating assembly 101, and a core material layer sorting and conveying line 10 including a diaphragm conveying line and positive electrode sheet conveying lines and negative electrode sheet conveying lines running through the tunnel heating assembly 101. The tunnel heating assembly 101 is a semi-enclosed heating device, which can effectively reduce the residual electrolyte on the electrode sheets and can directly perform physical crushing without drying. The positive electrode sheet conveying line and the negative electrode sheet conveying line use stainless steel chain mesh conveyor belts, which have corrosion resistance and high friction characteristics to ensure smooth operation of the equipment. The stainless steel mesh chain is equipped with 15mm high raised stainless steel claws, which can effectively prevent the electrode sheets from slipping on the mesh chain due to insufficient friction and causing material blockage. The tunnel heating assembly 101 includes a tunnel shell 1010, the side walls of the tunnel shell 1010 are hollow, the outer layer is made of stainless steel insulation structure, and the hollow part is filled with refractory insulation material to reduce heat loss. The tunnel shell 1010 has an inlet 1011 and an outlet 1012 at its two ends. The positive and negative electrode conveying lines enter the tunnel through the inlet 1011 and exit through the outlet 1012. A heating module 1013 is installed inside the tunnel shell 1010. The heating module 1013 is connected to a controller and uses PTC ceramic heating elements to provide a heat source. The temperature inside the chamber is controlled at a constant 90℃±15℃ by a temperature sensor 1015. A φ180mm negative pressure exhaust duct 1014, made of stainless steel, extends upwards by 300mm and has a connecting flange at the top for easy installation. The air pressure and volume are controlled by a regulating plate. An exhaust velocity of 3~5m / s at the chamber's exhaust port is sufficient for gas collection. The volatilized gaseous organic waste gas enters the exhaust gas treatment device through this duct. The tunnel heating assembly 101 has a turbulence impeller powered by a motor installed on its side wall, which can achieve uniform temperature within the cavity through impeller rotation. The tunnel housing 1010 has a temperature sensor 1015 and a nitrogen inlet valve 1016 on its side wall, both of which are connected to a controller. The core material layer sorting conveyor line 10 has two inclined conveyor devices at its discharge end, used to transfer the separated positive electrode sheets, negative electrode sheets, and diaphragms into packaging bags. The inclined conveyor devices use corrosion-resistant vulcanized belts with herringbone scrapers on the belt surface to prevent electrode slippage and material blockage.

[0052] Please refer to Figures 1 to 7 As shown, in Embodiment 2 of the present invention: the heating temperature of the heating component 6 in the preheating section 3 is 50°C; the heating component 6 in the classification section 4 controls the heating temperature to 50°C to heat the diaphragm, and controls the heating temperature to 70°C to heat the positive electrode and the negative electrode; the heating temperature of the heating component 6 in the heating section 5 is 70°C; and the heating temperature of the heating module 1013 is 80°C.

[0053] Please refer to Figures 1 to 7As shown, in Embodiment 3 of the present invention: the heating temperature of the heating component 6 in the preheating section 3 is 70°C; the heating component 6 in the classification section 4 controls the heating temperature to 70°C to heat the diaphragm, and controls the heating temperature to 90°C to heat the positive electrode and the negative electrode; the heating temperature of the heating component 6 in the heating section 5 is 90°C; and the heating temperature of the heating module 1013 is 100°C.

[0054] Please refer to Figures 1 to 7 As shown, in Embodiment 4 of the present invention: the heating temperature of the heating component 6 in the preheating section 3 is 60°C; the heating component 6 in the classification section 4 controls the heating temperature to 60°C to heat the diaphragm, and controls the heating temperature to 80°C to heat the positive electrode and the negative electrode; the heating temperature of the heating component 6 in the heating section 5 is 80°C; and the heating temperature of the heating module 1013 is 90°C.

[0055] In summary, the lithium battery positive and negative electrode synchronous sorting and conveying device of the present invention includes a core sorting conveyor assembly comprising a preheating section, a sorting section, and a heating section along the feeding direction. As the names suggest, the main tasks of these three stages are to preheat, sort, and heat the conveyed core material sequentially. The core material has a multi-layer structure, including at least three different core material layers: positive electrode sheet, negative electrode sheet, and separator. During operation, the core sorting conveyor assembly continuously conveys the disassembled lithium battery core material. The core material is flatly adsorbed onto the surface of the core sorting conveyor assembly under the adsorption of negative pressure adsorption holes. In the preheating section, the heating component controls the heating temperature within the range of 50°C to 70°C to preheat the core material layers. Within this temperature range, significant deformation of the separator will not occur. After entering the sorting section, a conveyor structure arranged in a binary tree structure is used. When the number of core material layers is greater than or equal to two, the core material is sorted and heated each time it passes a node. Two conveyor belts split into two branches under the relative adsorption of each other. After passing through multiple nodes, the originally stacked core material layers are separated into independent core material layers for separate transport. Finally, after the core material layers are sorted, the heating components in the sorting and heating sections control the heating temperature within the range of 50℃~70℃ to heat the diaphragm, and the heating components control the heating temperature within the range of 70℃~90℃ to heat the positive and negative electrode sheets. The purpose of preheating and heating is to accelerate the evaporation of electrolyte on the core material layers and to render the organic binding material between the core material layers ineffective through heating, which is conducive to the separation of material layers. When the temperature is maintained within the range of 70℃~90℃, the electrolyte evaporation rate is the fastest. The negative pressure adsorption holes are used to adsorb the core material layers and quickly remove the evaporating electrolyte from the core material layers, improving separation efficiency and avoiding contamination. Continuous and rapid collection of the evaporating electrolyte can also increase the recycling rate. The lithium battery positive and negative electrode synchronous sorting and conveying device of the present invention can achieve efficient and high-precision layering and sorting of lithium battery core material layers, while removing most of the electrolyte on the core material layer, so that the water content of the core material layer is less than 2%. The positive electrode, negative electrode and separator can be discharged separately, which is convenient for collection. At the same time, it can eliminate the drying step, improve efficiency, and directly crush the positive and negative electrode sheets separately. The resulting positive electrode powder has an average lithium content of more than 3.3% and a copper powder purity of more than 95%, thereby increasing the product value and creating more profit.

[0056] The above embodiments are only used to explain the technical solutions of the present invention and not to limit it. Although the above embodiments have provided specific descriptions of the present invention, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications and equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A lithium battery positive and negative electrode sheet synchronous classification conveying device, characterized in that, The application relates to a core material layer classification conveying belt assembly, which comprises a rack (1), a core material layer classification conveying belt assembly (2) arranged on the rack (1), the core material layer classification conveying belt assembly (2) comprising a preheating section (3), a classification section (4) and a heating section (5), the preheating section (3), the classification section (4) and the heating section (5) being respectively provided with a heating assembly (6) for heating a core material layer and a negative pressure adsorption hole (7) for adsorbing the core material layer and collecting electrolyte volatilized from the core material layer, the core material layer comprising positive plates, negative plates and separators arranged in a stack, the heating temperature range of the heating assembly (6) of the preheating section (3) being 50-70 DEG C, the heating temperature range of the heating assembly (6) of the classification section (4) being 50-90 DEG C, and the heating temperature range of the heating assembly (6) of the heating section (5) being 70-90 DEG C, the classification section (4) being arranged in a binary tree structure, and each discharge end of the classification section (4) being connected with a heating section (5). The application further comprises a controller arranged on the rack (1), each branch of the classification section (4) is provided with a thickness detection assembly (8) for detecting the thickness of the core material layer, and the heating assembly (6), the negative pressure adsorption hole (7) and the thickness detection assembly (8) are connected with the controller. The core material layer classification conveying belt assembly (2) comprises three or more vacuum conveying belts (21) arranged on the rack (1), the vacuum conveying belts (21) are provided with the negative pressure adsorption holes (7), the three or more vacuum conveying belts (21) are arranged in a binary tree structure in the classification section (4), and the heating assembly (6) comprises a conveying belt heater arranged on the vacuum conveying belt (21). The application further comprises movable discharge conveying belts (9) and core material layer classification conveying lines (10), the movable discharge conveying belts (9) are movably arranged on the rack (1) and connected with the controller, the discharge end of each heating section (5) is connected with the feeding end of a group of movable discharge conveying belts (9) in correspondence, the discharge end of the movable discharge conveying belt (9) is selectively connected with three or more core material layer classification conveying lines (10), and the movable discharge conveying belt (9) is used for conveying the classified core material layer into the corresponding core material layer classification conveying line (10).

2. The lithium battery positive and negative electrode sheet synchronous classification conveying device according to claim 1, characterized in that, The rack (1) is provided with a movable mounting frame (11) and a core material layer guide plate (12), the vacuum conveying belt (21) is arranged on the mounting frame (11), and the core material layer guide plate (12) is used for guiding the core material layer on the vacuum conveying belt (21) to discharge.

3. The lithium battery positive and negative electrode sheet synchronous classification conveying device according to claim 1, characterized in that, The outer cover of the vacuum conveying belt (21) is provided with a protective cover (22), and the side wall of the protective cover (22) is provided with an air inlet hole (221) and a heat preservation layer.

4. The lithium battery positive and negative electrode sheet synchronous classification conveying device according to claim 1, characterized in that, The feeding end of the movable discharge conveying belt (9) is hinged to the rack (1), and the rack (1) is provided with a driving assembly (13) for driving the discharge end of the movable discharge conveying belt (9) to switch the discharge between the three or more core material layer classification conveying lines (10).

5. The lithium battery positive and negative electrode sheet synchronous classification conveying device according to claim 1, characterized in that, The application further comprises a tunnel type heating assembly (101), and the core material layer classification conveying line (10) comprises a separator conveying line and positive plate conveying lines and negative plate conveying lines penetrating through the tunnel type heating assembly (101).

6. The lithium battery positive and negative electrode sheet synchronous classification conveying device according to claim 5, characterized in that, The tunnel heating assembly (101) comprises a tunnel shell (1010), two ends of the tunnel shell (1010) are respectively provided with an inlet (1011) and an outlet (1012), a positive plate conveying line and a negative plate conveying line enter the tunnel from the inlet (1011), the positive plate conveying line and the negative plate conveying line pass out of the tunnel from the outlet (1012), the tunnel shell (1010) is provided with a heating module (1013) inside, a side wall of the tunnel shell (1010) is provided with a negative pressure exhaust duct (1014), and the heating module (1013) is connected with a controller.

7. The lithium battery positive and negative electrode sheet synchronous classification conveying device according to claim 6, characterized in that, A side wall of the tunnel shell (1010) is provided with a temperature sensor (1015) and a nitrogen inlet valve (1016), and the temperature sensor (1015) and the nitrogen inlet valve (1016) are connected with the controller.

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