Integrated equipment for separating graphite and copper foil on negative plate of lithium ion battery

Abstract

The invention discloses integrated equipment for separating graphite and copper foil on a lithium ion battery negative plate, and belongs to the technical field of lithium ion battery recovery. Comprising a pretreatment water tank, a recovery water tank, a conveying mechanism, a pole piece fixing device, a spraying mechanism and a recovery liquid treatment system. The pretreatment water tank is used for dissolving a water-soluble adhesive to reduce the adhesive force of graphite and copper foil on the negative electrode plate, the electrode plate fixing device is used for fixing the pretreated negative electrode plate on the conveying mechanism, the conveying mechanism conveys the negative electrode plate to the position below the spraying mechanism, and the spraying mechanism sprays water to quickly separate the graphite from the copper foil. According to the equipment, the treatment of a large batch of negative plates can be completed within a short time, the separation efficiency is improved, the requirement of manual operation is reduced due to the automatic design of the equipment, and the automatic conveying of the negative plates and the efficient separation of graphite and copper foil are realized. Therefore, not only is the production efficiency improved, but also human errors are reduced, and the stability and consistency of the recovery process are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery recycling, and in particular to an integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium ion battery. Background Art

[0002] Lithium-ion batteries have a series of advantages such as small size, light weight, high energy density, high operating voltage, long cycle life and no memory effect. They have been widely used in cameras, mobile phones, laptops, cameras, portable measuring instruments, power banks, etc. In addition, they are also a high-energy power source for electric vehicles and energy storage power stations in the future. When the service life of lithium-ion batteries reaches the end, their subsequent reasonable treatment is an important issue that needs to be solved.

[0003] At present, the negative electrode sheets obtained after disassembly of scrapped lithium-ion batteries or the scraps and electrode residues generated in the production process of negative electrode sheets of lithium-ion batteries generally need to separate the active material graphite on the negative electrode sheets from the base material copper foil and then recycle them before the next step of processing.

[0004] In the existing technology, traditional separation methods often rely on manual, chemical solvents or inefficient mechanical means, which makes it difficult to efficiently complete the separation of large quantities of negative electrode sheets in a short time, resulting in a long recycling process and low efficiency. Chemical separation methods use strong acids or strong bases as solvents, which have potential harm to the environment and the problem of wastewater treatment is more complicated. During the separation process, existing technologies may cause a certain degree of damage to copper foil or graphite, affecting the quality of the recycled materials and reducing their value for secondary use.

[0005] Therefore, we made improvements to this problem and proposed an integrated device for separating graphite and copper foil on the negative electrode sheet of lithium-ion batteries. Summary of the invention

[0006] The object of the present invention is to provide an integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery, aiming to solve at least one of the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows:

[0007] An integrated device for separating graphite and copper foil on negative electrode sheets of lithium-ion batteries, comprising a pretreatment water tank, a recovery water tank, a conveying mechanism, a plate fixing device, a spraying mechanism and a recovery liquid treatment system; wherein the conveying mechanism is arranged on the top of the recovery water tank, the plate fixing device is arranged on the conveying mechanism, the plate fixing device is used to fix the negative electrode sheet treated by the pretreatment water tank on the conveying mechanism, the conveying mechanism is used to convey the negative electrode sheet fixed on the conveying mechanism to the bottom of the spraying mechanism, the spraying mechanism is fixedly arranged above a side of the conveying mechanism away from the pretreatment water tank, the water flow sprayed by the spraying mechanism peels off the graphite particles on the negative electrode sheet, and the graphite particles are recovered into the recovery water tank along with the water flow, the recovery liquid treatment system is connected to the recovery water tank, and the recovery liquid treatment system is used to treat the liquid mixture containing graphite wet material recovered into the recovery water tank.

[0008] As a further solution of the present invention: the conveying mechanism includes a bracket, two of the brackets are fixedly arranged on both sides of the top of the recovery water tank, a transmission roller is rotatably arranged between the two ends of the two brackets, a conveyor belt is overlapped between the two transmission rollers, and the transmission roller is driven by a driving source.

[0009] As a further solution of the present invention: a plurality of support rods are evenly arranged on the two brackets, and support auxiliary rollers are rotatably connected to the tops of the two support rods, and the support auxiliary rollers are used to support the conveyor belt.

[0010] As a further solution of the present invention: the pole piece fixing device includes a horizontal plate, a vertical plate and fixing bolts, the horizontal plate is fixedly arranged on the top surface of the conveyor belt, a plurality of the vertical plates are evenly arranged on the horizontal plate through the fixing bolts, and the vertical plates are cross-intersected with the horizontal plates.

[0011] As a further solution of the present invention: the spray mechanism includes a support plate, a spray pipeline and a spray head, the two support plates are respectively fixed on the two brackets, the spray pipeline is erected on the top of the two brackets, a plurality of the spray heads are evenly arranged on the spray pipeline, and the spray heads are connected to the inside of the spray pipeline.

[0012] As a further solution of the present invention: the recovery liquid treatment system includes a centrifuge, a water circulation system and a graphite wet material treatment system, the centrifuge is connected to the recovery water tank, the centrifuge performs solid-liquid separation on the liquid mixture containing graphite wet material in the recovery water tank, the separated liquid enters the water circulation system for treatment and then is transported to the spray mechanism for recycling, and the separated solid graphite wet material enters the graphite wet material treatment system for treatment into graphite powder.

[0013] As a further solution of the present invention: the conveying mechanism, the electrode fixing device and the spraying mechanism are all made of waterproof materials.

[0014] As a further solution of the present invention: an opening is arranged at the top of the pretreatment water tank, and a drain outlet is arranged at the bottom of the side of the pretreatment water tank.

[0015] As a further solution of the present invention: the conveying mechanism is erected just above the opening provided at the top of the recovery water tank, and the recovery liquid treatment system is communicated with the drainage port at the bottom of the side of the recovery water tank.

[0016] As a further solution of the present invention: it also includes a controller, and the controller is at least communicatively connected with the conveying mechanism, the spraying mechanism and the recovery liquid processing system.

[0017] The present invention has the following beneficial effects:

[0018] The present invention is provided with a pretreatment water tank, a recovery water tank, a conveying mechanism, a pole piece fixing device, a spraying mechanism and a recovery liquid treatment system. The water-soluble adhesive is first dissolved in the pretreatment water tank to reduce the adhesion between the graphite and the copper foil on the negative electrode sheet. The pretreated negative electrode sheet is then fixed on the conveying mechanism by the pole piece fixing device. The conveying mechanism then transports the negative electrode sheet to the bottom of the spraying mechanism. The spraying mechanism sprays water to quickly separate the graphite from the copper foil, greatly improving the separation efficiency. The equipment can complete the processing of a large number of negative electrode sheets in a short time, solving the problem of low separation efficiency in the prior art. The automated design of the equipment reduces the need for manual operation, realizes the automatic transportation of the negative electrode sheet and the efficient separation of graphite and copper foil. This not only improves production efficiency, but also reduces the occurrence of human errors, and ensures the stability and consistency of the recycling process.

[0019] The present invention pretreats the water-soluble adhesive, avoids the use of harmful chemicals (such as strong acids, strong alkalis, etc.), reduces environmental pollution and the difficulty of wastewater treatment in the recycling process. Compared with traditional chemical separation methods, the equipment is more environmentally friendly and in line with the concept of green recycling.

[0020] The invention uses a precise pressurized nozzle design to ensure that graphite is effectively washed away while copper foil remains intact, thus avoiding the problem of copper foil damage that may occur in traditional mechanical separation methods. This ensures the recycling quality of copper foil, allowing copper foil to be reused, while ensuring the integrity of graphite recycling and improving the economic value of recycled materials.

[0021] The electrode plate fixing device of the present invention can handle lithium-ion battery negative electrode plates of different sizes, has strong adaptability, and can meet recycling needs of different scales. Whether it is small batch or large batch battery negative electrode recycling, it can operate efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the structure of an integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0026] Figure 4 It is a structural block diagram of the recovery liquid treatment system of the present invention.

[0027] In the figure: 1. pretreatment water tank; 2. recovery water tank; 21. drain port; 3. conveying mechanism; 31. bracket; 32. transmission roller; 33. conveyor belt; 34. support rod; 35. supporting auxiliary roller; 4. pole piece fixing device; 41. horizontal plate; 42. vertical plate; 43. fixing bolt; 5. spray mechanism; 51. support plate; 52. spray pipeline; 53. nozzle; 6. recovery liquid treatment system; 7. controller. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that terms such as "up", "down", "left", "right", "front" and "back" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they should not be understood as limitations on the present invention.

[0030] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] See also Figure 1 As shown, an embodiment of the present invention provides an integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery, including a pretreatment water tank 1, a recovery water tank 2, a conveying mechanism 3, a pole piece fixing device 4, a spraying mechanism 5 and a recovery liquid treatment system 6.

[0032] An opening is set at the top of the pretreatment water tank 1, and a drainage outlet is set at the bottom of the side of the pretreatment water tank 1. During the processing of the negative electrode sheet, the negative electrode sheet will first be placed in the pretreatment water tank 1 for immersion to dissolve the water-soluble adhesive attached to the negative electrode sheet, thereby effectively reducing the adhesion between the graphite and the copper foil on the negative electrode sheet.

[0033] The recovery water tank 2 is arranged on one side of the pretreatment water tank 1, and the recovery water tank 2 is not connected to the pretreatment water tank 1. The conveying mechanism 3 is set just above the opening arranged on the top of the recovery water tank 2, and the electrode fixing device 4 is arranged on the conveying mechanism 3. The electrode fixing device 4 is used to fix the negative electrode sheet treated by the pretreatment water tank 1 on the conveying mechanism 3 to prevent the negative electrode sheet from being offset or damaged during the subsequent treatment process. The conveying mechanism 3 is used to convey the negative electrode sheet fixed on the conveying mechanism 3 to the bottom of the spraying mechanism 5.

[0034] The spray mechanism 5 is fixedly arranged above the side of the conveying mechanism 3 away from the pretreatment water tank 1. The water flow sprayed by the spray mechanism 5 peels off the graphite particles on the negative electrode sheet, and the graphite particles are recovered into the recovery water tank 2 along with the water flow.

[0035] The recovery liquid treatment system 6 is connected to the drain port 21 at the bottom of the side of the recovery water tank 2. The recovery liquid treatment system 6 is used to treat the liquid mixture containing wet graphite material recovered into the recovery water tank 2. After the liquid mixture is treated by the recovery liquid treatment system 6, the liquid and the solid are separated, and finally the wet graphite material is separated from the clean water. The separated clean water can be further returned to the spray mechanism 5 for the next round of spray cleaning, recycling water resources, and the wet graphite material is converted into high-quality graphite powder after treatment.

[0036] It is understandable that the device is also provided with a controller 7, which can communicate with the conveying mechanism 3, the spraying mechanism 5 and the recovery liquid treatment system 6. The controller 7 coordinates and controls the orderly operation of the conveying mechanism 3, the spraying mechanism 5 and the recovery liquid treatment system 6, thereby improving the automation of the device and ensuring accurate operation and smooth connection of each link. The precision and automation of the equipment directly affect the processing efficiency and product quality. At the same time, it also greatly reduces the need for manual intervention and improves the safety and stability of the overall operation.

[0037] See also Figure 1As shown, in this embodiment, the conveying mechanism 3 includes a bracket 31, and the two brackets 31 are respectively fixed on both sides of the top of the recovery water tank 2 by bolts. A transmission roller 32 is rotatably arranged between the two ends of the two brackets 31, and a conveyor belt 33 is overlapped between the two transmission rollers 32. The electrode fixing device 4 fixes the negative electrode sheet treated by the pretreatment water tank 1 on the conveyor belt 33. The transmission roller 32 is driven by a driving source, and the driving source can be a driving motor with a belt. The driving source selects the existing technology and is not shown in the figure. When working, the controller 7 controls the start and stop of the driving source, and the driving source drives the transmission roller 32 to rotate, and the transmission roller 32 drives the conveyor belt 33 to move. The negative electrode sheet fixed on the conveyor belt 33 is transported to the bottom of the spray mechanism 5 through the movement of the conveyor belt 33.

[0038] For further information, see Figure 3 As shown, in this embodiment, a plurality of support rods 34 are evenly arranged on the two brackets 31, and support auxiliary rollers 35 are rotatably connected to the tops of the two support rods 34. The support auxiliary rollers 35 are used to support the conveyor belt 33 to improve the stability of the conveyor belt 33 when moving.

[0039] See also Figure 3 As shown, in this embodiment, the electrode fixing device 4 includes a horizontal plate 41, a vertical plate 42 and a fixing bolt 43. The horizontal plate 41 is fixedly arranged on the top surface of the conveyor belt 33. A plurality of vertical plates 42 are evenly arranged on the horizontal plate 41 through the fixing bolts 43, and the vertical plates 42 cross the horizontal plate 41. When in use, the negative electrode sheet treated by the pretreatment water tank 1 is fixed under the vertical plates 42. Generally speaking, two negative electrode sheets are fixed between three vertical plates 42, and the distance between the vertical plates 42 and the number of the vertical plates 42 are determined according to the size of the negative electrode sheet.

[0040] See also Figure 1 As shown, in this embodiment, the spray mechanism 5 includes a support plate 51, a spray pipeline 52 and a nozzle 53. The two support plates 51 are fixedly arranged on the two brackets 31 respectively. During installation, it is necessary to ensure that the support plates 51 do not contact the conveyor belt 33. The spray pipeline 52 is erected on the top of the two brackets 31. The spray pipeline 52 is connected to an external water source. A number of nozzles 53 are evenly arranged on the spray pipeline 52, and the nozzles 53 are connected to the inside of the spray pipeline 52. Through the precisely designed nozzle 53, the water flow sprayed by the nozzle 53 can accurately act on the surface of the negative electrode sheet. The water pressure of the water flow sprayed by the nozzle 53 must ensure that the graphite particles are completely peeled off. When the graphite is washed down, the water flow will guide it to the recovery water tank 2. At the same time, due to its strong adhesion, the copper foil will not be washed down by the water flow, but will be effectively transported to the top of the conveyor belt 33 for recycling.

[0041] See also Figure 4As shown, in this embodiment, the recovery liquid treatment system 6 includes a centrifuge, a water circulation system and a graphite wet material treatment system. The liquid mixture containing the graphite wet material in the recovery water tank 2 enters the centrifuge through the discharge port 21 at the bottom of the side of the recovery water tank 2. The centrifuge separates the liquid and the solid by high-speed rotation, and finally separates the wet graphite material from the liquid. The separated liquid enters the water circulation system for treatment and is then transported to the spray mechanism 5 for recycling. The separated solid graphite wet material enters the graphite wet material treatment system for further drying or other process treatment to be converted into high-quality graphite powder.

[0042] It should be noted that the conveying mechanism 3 , the electrode fixing device 4 and the spraying mechanism 5 are all made of waterproof materials.

[0043] Directions:

[0044] First, the negative electrode sheet is placed in the pretreatment water tank 1 for immersion to dissolve the water-soluble adhesive attached to the negative electrode sheet, thereby effectively reducing the adhesion between the graphite and the copper foil.

[0045] After being soaked, the electrode fixing device 4 fixes the negative electrode plate treated by the pre-treatment water tank 1 on the conveyor belt 33 to prevent it from being deviated or damaged during subsequent treatment.

[0046] Subsequently, the negative electrode sheet is driven by the conveyor belt 33 and conveyed upward along a predetermined trajectory to enter the next processing link. The negative electrode sheet is transported to the bottom of the spray mechanism 5 through the movement of the conveyor belt 33.

[0047] The water flow sprayed by the nozzle 53 of the spray mechanism 5 can accurately act on the surface of the negative electrode sheet to ensure that the graphite particles are completely peeled off. While the graphite is washed off, the water flow will guide it to the recovery water tank 2. At the same time, due to its strong adhesion, the copper foil will not be washed off by the water flow, but will be effectively transported to the top of the conveyor belt 33 for recycling.

[0048] The drain port 21 at the bottom of the side of the recovery water tank 2 is opened, and the liquid mixture containing wet graphite material enters the centrifuge through the drain pipe. The centrifuge separates the liquid and the solid by high-speed rotation, and finally separates the wet graphite material from the liquid. The separated liquid enters the water circulation system for treatment and is then transported to the spray mechanism 5 for recycling. The water circulation system ensures the efficient recycling of water resources and minimizes water waste.

[0049] The separated solid graphite wet material enters the graphite wet material processing system for further drying or other process treatment to be converted into high-quality graphite powder.

[0050] The above is a detailed description of the preferred embodiments of the present invention, which cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. An integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery, characterized in that: The invention comprises a pretreatment water tank (1), a recovery water tank (2), a conveying mechanism (3), an electrode fixing device (4), a spraying mechanism (5) and a recovery liquid treatment system (6); wherein the conveying mechanism (3) is arranged on the top of the recovery water tank (2), the electrode fixing device (4) is arranged on the conveying mechanism (3), the electrode fixing device (4) is used to fix the negative electrode treated by the pretreatment water tank (1) on the conveying mechanism (3), and the conveying mechanism (3) is used to fix the negative electrode fixed on the conveying mechanism (3) The negative electrode sheet on the negative electrode sheet is transported to the bottom of the spray mechanism (5), and the spray mechanism (5) is fixedly arranged above the side of the transport mechanism (3) away from the pretreatment water tank (1). The water flow sprayed by the spray mechanism (5) peels off the graphite particles on the negative electrode sheet, and the graphite particles are recovered into the recovery water tank (2) along with the water flow. The recovery liquid treatment system (6) is connected to the recovery water tank (2), and the recovery liquid treatment system (6) is used to treat the liquid mixture containing the graphite wet material recovered into the recovery water tank (2).

2. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The conveying mechanism (3) comprises a bracket (31), wherein two brackets (31) are respectively fixedly arranged on both sides of the top of the recovery water tank (2), a transmission roller (32) is rotatably arranged between the two ends of the two brackets (31), a conveyor belt (33) is overlapped between the two transmission rollers (32), and the transmission roller (32) is driven by a driving source.

3. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 2, characterized in that: A plurality of support rods (34) are evenly arranged on the two brackets (31), and a supporting auxiliary roller (35) is rotatably connected to the top of the two support rods (34), and the supporting auxiliary roller (35) is used to support the conveyor belt (33).

4. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 2, characterized in that: The pole piece fixing device (4) comprises a horizontal plate (41), a vertical plate (42) and fixing bolts (43); the horizontal plate (41) is fixedly arranged on the top surface of the conveyor belt (33); a plurality of vertical plates (42) are evenly arranged on the horizontal plate (41) through the fixing bolts (43); and the vertical plates (42) and the horizontal plate (41) are cross-shaped.

5. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 2, characterized in that: The spray mechanism (5) comprises a support plate (51), a spray pipeline (52) and a spray head (53); the two support plates (51) are respectively fixedly arranged on the two brackets (31); the spray pipeline (52) is mounted on the top of the two brackets (31); a plurality of spray heads (53) are evenly arranged on the spray pipeline (52); and the spray heads (53) are connected to the inside of the spray pipeline (52).

6. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The recovery liquid treatment system (6) comprises a centrifuge, a water circulation system and a graphite wet material treatment system. The centrifuge is connected to the recovery water tank (2). The centrifuge performs solid-liquid separation on the liquid mixture containing the graphite wet material in the recovery water tank (2). The separated liquid enters the water circulation system for treatment and is then transported to the spray mechanism (5) for recycling. The separated solid graphite wet material enters the graphite wet material treatment system for treatment to become graphite powder.

7. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The conveying mechanism (3), the electrode fixing device (4) and the spraying mechanism (5) are all made of waterproof materials.

8. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: An opening is arranged at the top of the pretreatment water tank (1), and a drainage outlet is arranged at the bottom of the side of the pretreatment water tank (1).

9. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: The conveying mechanism (3) is erected just above the opening provided at the top of the recovery water tank (2), and the recovery liquid treatment system (6) is connected to the liquid discharge port (21) at the bottom of the side of the recovery water tank (2).

10. The integrated device for separating graphite and copper foil on a negative electrode sheet of a lithium-ion battery according to claim 1, characterized in that: It also includes a controller (7), which is at least in communication connection with the conveying mechanism (3), the spraying mechanism (5) and the recovery liquid processing system (6).

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