Device for treating negative plate of lithium ion battery at high temperature

Abstract

The utility model discloses a device for treating a negative plate of a lithium ion battery at high temperature, and relates to the field of lithium battery materials. Comprising a rack, a sintering furnace, a rotating roller and a conveying belt, the rack comprises a bottom frame, a plurality of supporting frames installed on the bottom frame and supporting plates connected to the two sides of the bottom frame, and a recycling part is arranged at the upper end of the bottom frame; the sintering furnace and the rotating roller are sequentially arranged above the bottom frame, the sintering furnace is fixedly connected with the supporting frame, the rotating roller is rotationally connected with the supporting frame, and a plurality of screen holes are formed in the side wall of the rotating roller; the two ends of the sintering furnace and the two ends of the rotary roller are provided with a feeding port and a discharging port correspondingly. The conveying belt extends to the discharging port from the feeding port. The multiple ultrasonic vibration boxes and the multiple air blowers are arranged on the supporting plate. The graphite recycling device is used for solving the problems of low graphite recycling efficiency, high cost and serious environmental pollution, and the automation level of lithium ion battery negative plate treatment is improved.

Description

Technical Field

[0001] The utility model belongs to the field of lithium battery materials, and in particular relates to a device for high-temperature processing of negative electrode sheets of lithium ion batteries. Background Art

[0002] With the popularization and widespread application of electronic products, the number of waste lithium-ion batteries has shown a sharp growth trend. These waste batteries contain rich valuable metal resources, such as copper, cobalt, lithium, etc., and have extremely high recycling value. Among them, the negative electrode sheet, as an important component of lithium-ion batteries, is usually composed of key materials such as copper foil and graphite. Copper foil, as a current collector, plays a vital role in the battery, and has high economic value due to its good conductivity and ductility. However, during the manufacturing and use of the negative electrode sheet, binders, conductive agents and other impurities will adhere to the copper foil. The presence of these impurities not only affects the purity of the copper foil, but also increases the difficulty and cost of metal recycling.

[0003] Recycling copper from the negative electrode of waste lithium-ion batteries has important economic and environmental significance. At present, the commonly used methods for recycling Cu from the negative electrode of waste lithium batteries mainly include the following: wet treatment, soaking the negative electrode in deionized water, and separating the copper foil from the graphite by washing away the binder; physical separation, through screening and classification operations, the treated materials are physically separated to obtain copper foil and graphite; heat treatment, under certain high temperature conditions, the binder is removed by heat treatment to separate the copper foil current collector from the negative active material graphite powder; electrolysis treatment, electrolysis in the electrolyte, and the copper foil and graphite are separated by the action of electric current.

[0004] However, experiments show that temperature, pH, air volume, catalyst dosage, etc. will affect the dissolution rate of copper. When the reaction temperature is 60℃, pH is 7, and air flow rate is 360 m 3 / h, the dissolution rate of the copper sheet is 0.0288 g / (cm 2 .h), the dissolution rate is slow. The physical separation method requires appropriate equipment and technology, such as vibrating screens, centrifuges, etc. The cost of these equipment is not low, and it may take a long time to achieve the ideal separation effect, increasing the production cost and cycle. Although high-temperature calcination can achieve the separation of copper and graphite in some cases, it has the disadvantages of high energy consumption, environmental impact, graphite loss, difficulty in process control, high equipment cost and waste of resources. The electrolysis process requires appropriate equipment and energy supply, such as electrolytic cells, current sources, etc. These devices usually require a lot of energy, so the energy consumption may be high, and the investment and maintenance costs of the equipment itself are also high.

[0005] Therefore, developing a more efficient, environmentally friendly and low-cost processing device is of great significance for improving the recovery rate and purity of copper and promoting the resource utilization of waste lithium-ion batteries. Utility Model Content

[0006] The utility model provides a device for high-temperature treatment of negative electrode sheets of lithium-ion batteries, which solves the problems of low graphite recovery efficiency, high cost and severe environmental pollution, is environmentally friendly and energy-saving, has a high recovery rate, reduces production costs, and improves the automation level of lithium-ion battery negative electrode sheet treatment.

[0007] The technical solutions used in this utility model are as follows:

[0008] A device for high-temperature processing of negative electrode sheets of lithium-ion batteries, comprising a frame, a sintering furnace, a rotating drum and a conveyor belt;

[0009] The frame includes a base frame, a plurality of support frames fixedly mounted on the base frame, and support plates fixedly connected to both sides of the base frame, and a recovery portion is provided at the upper end of the base frame;

[0010] The sintering furnace and the rotating drum are both located above the base frame, the sintering furnace is fixedly connected to the support frame, the rotating drum is rotatably connected to the support frame, and a plurality of sieve holes are provided on the side wall of the rotating drum;

[0011] The end of the sintering furnace away from the rotating drum is a loading port, the end of the rotating drum away from the sintering furnace is a discharging port, and the conveyor belt extends from the loading port to the discharging port;

[0012] It also includes an ultrasonic vibration box and a blower, wherein a plurality of the ultrasonic vibration boxes and the blower are provided, and the plurality of the ultrasonic vibration boxes and the blower are arranged on the support plate.

[0013] Furthermore, a plurality of the ultrasonic vibration boxes are located on both sides of the sintering furnace and the rotating drum; a plurality of the blowers are located on both sides of the rotating drum, and the wind direction of the blowers is set toward the conveyor belt.

[0014] Furthermore, a plurality of capacity grooves are respectively provided on opposite sides of the two support plates, and the ultrasonic vibration boxes are embedded in the capacity grooves.

[0015] Furthermore, the recovery part includes a recovery trough and a discharge port, the recovery trough is arranged at the upper end of the base frame, the bottom of the recovery trough is arranged inclined, the recovery trough is higher at one end close to the loading port, and the discharge port is opened at the end of the recovery trough.

[0016] Furthermore, each of the ultrasonic vibration boxes is provided with a plurality of ultrasonic transducers, and the plurality of ultrasonic transducers are arranged in a matrix in the ultrasonic vibration box.

[0017] Furthermore, the number of ultrasonic transducers in the ultrasonic vibration box is set to 24, and the frequency bandwidth of the ultrasonic transducers ranges from 10 kHz to 50 kHz.

[0018] Furthermore, a second pulley is fixedly mounted on the outer circumference of the rotating drum, and the second pulley is coaxial with the rotating drum.

[0019] Furthermore, it also includes a driving mechanism, which includes a motor, a first bevel gear, a second bevel gear and a first pulley, the first bevel gear is fixedly connected to the output end of the motor, the first bevel gear is meshed with the second bevel gear, the first bevel gear and the first pulley are fixedly installed on the same gear shaft, and the first pulley and the second pulley are connected by a synchronous belt drive.

[0020] Furthermore, the mesh size of the sieve holes on the rotating drum is set to 100-300 meshes.

[0021] Furthermore, the recovery part is made of 304 stainless steel.

[0022] The beneficial effects of the utility model are:

[0023] 1. The utility model combines the high temperature treatment of the sintering furnace and the ultrasonic vibration treatment of the ultrasonic vibration box. Under high temperature environment, the graphite material forms spherical particles due to surface tension and falls off the copper foil. At the same time, the ultrasonic vibration box stimulates the graphite particles to shake violently, causing the graphite on the surface of the material to break and separate from the copper foil. Compared with a single treatment method, this dual treatment method can more efficiently separate graphite from copper foil, greatly improving the recycling efficiency.

[0024] 2. The utility model reduces production costs by optimizing equipment design and work flow. The side wall of the rotating drum is provided with sieve holes and equipped with a blower. After the graphite is blown off, it is rotated and screened, so that the graphite falls from the sieve holes into the recovery part. This integrated screening and collection design reduces manual intervention and intermediate links, further improves the efficiency of recovery, and at the same time reduces dependence on traditional complex separation equipment, reducing equipment investment and maintenance costs.

[0025] 3. The utility model avoids the large amount of energy consumption and environmental pollution problems that may be generated during high-temperature calcination. At the same time, ultrasonic vibration, as a physical treatment method, does not require the addition of chemical reagents, avoids chemical pollution, and conforms to the concept of green and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the device for high temperature treatment of negative electrode sheets of lithium-ion batteries provided by the utility model;

[0027] Figure 2 A top view of a device for high temperature treatment of negative electrode sheets of lithium-ion batteries provided by the utility model;

[0028] Figure 3 This is a schematic diagram of the driving mechanism provided by the utility model.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Frame; 2. Sintering furnace; 3. Rotating drum; 4. Loading port; 5. Discharging port; 6. Conveyor belt; 7. Recovery unit; 8. Ultrasonic vibration box; 9. Driving mechanism; 10. Blower; 11. Base frame; 12. Support frame; 13. Support plate; 31. Sieve hole; 32. Second pulley; 71. Recovery trough; 72. Discharging port; 91. Motor; 92. First bevel gear; 93. Second bevel gear; 94. Gear shaft; 95. First pulley; 96. Timing belt. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0033] like Figure 1-Figure 3 As shown, this embodiment provides a device for high-temperature treatment of negative electrode sheets of lithium-ion batteries, including a frame 1, a sintering furnace 2, a rotating drum 3, a conveyor belt 6, an ultrasonic vibration box 8, a blower 10, a recovery unit 7, and a driving mechanism 9. During operation, the conveyor belt 6 sequentially delivers the negative electrode sheets to the sintering furnace 2 and the rotating drum 3. Under the dual effects of the high temperature of the sintering furnace 2 and the ultrasonic vibration box 8, the graphite on the negative electrode sheet falls off, and then the blower 10 blows the graphite off the conveyor belt 6, and the driving mechanism 9 drives the rotating drum 3 to rotate, screens the material, and the fallen graphite falls into the recovery unit 7 through the sieve hole 31, finally realizing efficient recovery of graphite.

[0034] The frame 1 plays a key role in supporting the entire device, such as Figure 1 and Figure 2As shown, the frame 1 includes a base frame 11, a plurality of support frames 12 and a support plate 13. The base frame 11 is located at the bottom of the device and is the basic support structure of the entire device. The plurality of support frames 12 are fixedly mounted on the base frame 11, and the support plate 13 is fixedly connected to both sides of the base frame 11. A recovery part 7 is provided at the upper end of the base frame 11 for collecting materials in the processing process.

[0035] like Figure 1 and Figure 2 As shown, the sintering furnace 2 and the rotating drum 3 are both located above the base frame 11. The sintering furnace 2 is fixedly connected to a plurality of support frames 12. The end of the sintering furnace 2 away from the rotating drum 3 is a loading port 4, which is the entrance for the negative electrode sheet of the lithium-ion battery to enter the device. In this embodiment, the temperature of the sintering furnace 2 is set to 400°C, which is used to perform high-temperature treatment on the negative electrode sheet of the lithium-ion battery entering, so that the graphite material forms spherical particles under the action of surface tension and falls off the copper foil; the rotating drum 3 is rotatably connected to the plurality of support frames 12, and a plurality of sieve holes 31 are provided on the side wall of the rotating drum 3. In this embodiment, the mesh number of the sieve holes 31 is set to 100-300 meshes. The end of the rotating drum 3 away from the sintering furnace 2 is a discharging port 5, which is the exit for the negative electrode sheet to leave the device after treatment. In addition, a second pulley 32 is fixedly installed on the outer circumference of the rotating drum 3, and the second pulley 32 is coaxial with the rotating drum 3.

[0036] One end of the conveyor belt 6 is located at the loading port 4 , and the other end extends to the discharging port 5 , so as to transport the negative electrode sheet of the lithium-ion battery from the loading port 4 of the sintering furnace 2 to the rotating drum 3 , and finally send it out from the discharging port 5 .

[0037] like Figure 1 and Figure 2 As shown, there are multiple ultrasonic vibration boxes 8 and blowers 10. In this embodiment, there are six ultrasonic vibration boxes 8 and four blowers 10. The six ultrasonic vibration boxes 8 and the four blowers 10 are respectively arranged on the support plate 13. Two of the support plates 13 are provided with multiple capacity slots on opposite sides, and the ultrasonic vibration boxes 8 are embedded in the capacity slots. The six ultrasonic vibration boxes 8 are distributed on both sides of the sintering furnace 2 and the rotating drum 3. Each ultrasonic vibration box 8 is provided with multiple ultrasonic transducers, which are 24 in this embodiment. These ultrasonic transducers are arranged in a matrix in the ultrasonic vibration box 8, and the frequency bandwidth of the ultrasonic transducers ranges from 10 kHz to 50 kHz; the four blowers 10 are distributed on both sides of the rotating drum 3, and the wind direction of the blowers 10 is set toward the conveyor belt 6. The ultrasonic vibration box 8 uses ultrasonic waves to excite the graphite particles to shake violently, causing the graphite particles to be subjected to frequent and violent impacts, thereby causing the graphite on the surface of the material to break, fall off, and be separated from the copper foil; the blower 10 is used to perform air blowing during the transportation of the negative electrode sheet, blowing the graphite separated from the copper foil onto the rotating drum 3, and discharging it to the recovery part 7 through the sieve hole 31.

[0038] Specifically, Figure 1 and Figure 2 As shown, the recovery part 7 includes a recovery trough 71 and a discharge port 72. The recovery part 7 is made of 304 stainless steel to prevent corrosion after long-term reaction and extend the service life of the device. The recovery trough 71 is arranged at the upper end of the base frame 11. The bottom of the recovery trough 71 is arranged obliquely, and the end close to the feed port 4 is higher, which is convenient for the material falling from the sieve hole 31 of the rotating drum 3 to slide and be collected; the discharge port 72 is opened at the end of the recovery trough 71 for discharging the collected material.

[0039] like Figure 1-Figure 3 As shown, the driving mechanism 9 is mainly composed of a motor 91, a first bevel gear 92, a second bevel gear 93, a gear shaft 94, a first pulley 95 and a synchronous belt 96. The output end of the motor 91 is fixedly connected to the first bevel gear 92, and the motor 91 provides power for the entire driving process. The first bevel gear 92 and the second bevel gear 93 are meshed with each other, and the axes of the two are perpendicular to each other, so as to realize the steering transmission of power. The first bevel gear 92 and the first pulley 95 are fixedly mounted on the same gear shaft 94 to ensure that they rotate synchronously. The first pulley 95 is connected to the second pulley 32 on the rotating drum 3 through the synchronous belt 96, so as to transmit the power of the motor 91 to the rotating drum 3 so that it can rotate.

[0040] The use principle of the utility model is as follows.

[0041] The negative electrode sheet of the lithium-ion battery to be processed is placed at the position of the conveyor belt 6 at the loading port 4, and the conveyor belt 6 starts to run to transport the negative electrode sheet to the sintering furnace 2. After the negative electrode sheet enters the sintering furnace 2, the sintering furnace 2 maintains a high temperature of 400°C, and performs high-temperature treatment on the negative electrode sheet, so that the graphite material forms spherical particles under the action of surface tension, separates from the copper foil, and enters the rotating drum 3 with the conveyor belt 6. During the transmission of the negative electrode sheet in the sintering furnace 2 and the rotating drum 3, the ultrasonic vibration box 8 located on both sides of the sintering furnace 2 and the rotating drum 3 is turned on, and the ultrasonic transducer converts the input electrical power into mechanical power, that is, ultrasonic waves, and then transmits it out, while consuming a small part of the power itself, and the ultrasonic transducer emits a wavelength of the inherent frequency, generates cavitation in the medium, generates fine air explosions, and uses ultrasonic waves to excite the graphite particles to shake violently, so that the graphite particles are subjected to frequent and intense impacts, thereby causing the graphite on the surface of the material to break, fall off, and separate from the copper foil. When conveyed into the rotating drum 3 , the blowers 10 on both sides of the rotating drum 3 are turned on to blow air toward the conveyor belt 6 , so as to blow the separated graphite particles off the conveyor belt 6 .

[0042] At the same time, the driving mechanism 9 works, the motor 91 drives the first bevel gear 92 to rotate, the first bevel gear 92 transmits power to the gear shaft 94 through the transmission with the second bevel gear 93, and then drives the first pulley 95 to rotate, and the first pulley 95 drives the second pulley 32 on the outer periphery of the rotating drum 3 through the synchronous belt 96 to rotate the rotating drum 3. During the rotation of the rotating drum 3, since there are 100-300 mesh sieve holes 31 on its side wall, graphite that meets the size requirements will fall from the sieve holes 31 and enter the recovery tank 71 at the upper end of the chassis 11. The graphite slides along the slope of the recovery tank 71 to the discharge port 72 and is finally collected. This series of precisely coordinated mechanical actions ensures the efficient separation and recovery of graphite and improves the automation level of lithium-ion battery negative electrode sheet processing.

[0043] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A device for high temperature treatment of negative electrode sheets of lithium ion batteries, characterized in that: It comprises a frame (1), a sintering furnace (2), a rotating drum (3) and a conveyor belt (6); The frame (1) comprises a base frame (11), a plurality of support frames (12) fixedly mounted on the base frame (11), and support plates (13) fixedly connected to both sides of the base frame (11), and a recovery portion (7) is provided at the upper end of the base frame (11); The sintering furnace (2) and the rotating drum (3) are both located above the base frame (11); the sintering furnace (2) is fixedly connected to the support frame (12); the rotating drum (3) is rotatably connected to the support frame (12); and a plurality of sieve holes (31) are provided on the side wall of the rotating drum (3); The end of the sintering furnace (2) away from the rotating drum (3) is a loading port (4), the end of the rotating drum (3) away from the sintering furnace (2) is a discharging port (5), and the conveyor belt (6) extends from the loading port (4) to the discharging port (5); It also comprises an ultrasonic vibration box (8) and a blower (10), wherein a plurality of the ultrasonic vibration boxes (8) and the blower (10) are provided, and the plurality of the ultrasonic vibration boxes (8) and the blower (10) are arranged on the support plate (13).

2. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1, characterized in that: The plurality of ultrasonic vibration boxes (8) are located on both sides of the sintering furnace (2) and the rotating drum (3); the plurality of blowers (10) are located on both sides of the rotating drum (3), and the wind direction of the blowers (10) is set toward the conveyor belt (6).

3. A device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1 or 2, characterized in that: A plurality of capacity slots are respectively provided on opposite sides of the two support plates (13), and the ultrasonic vibration boxes (8) are embedded in the capacity slots.

4. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1, characterized in that: The recovery portion (7) comprises a recovery trough (71) and a discharge port (72); the recovery trough (71) is arranged at the upper end of the base frame (11); the bottom of the recovery trough (71) is arranged obliquely; the end of the recovery trough (71) close to the feed port (4) is higher; and the discharge port (72) is opened at the end of the recovery trough (71).

5. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1, characterized in that: A plurality of ultrasonic transducers are arranged in each ultrasonic vibration box (8), and the plurality of ultrasonic transducers are arranged in a matrix manner in the ultrasonic vibration box (8).

6. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 5, characterized in that: The number of ultrasonic transducers in the ultrasonic vibration box (8) is set to 24, and the frequency bandwidth of the ultrasonic transducers ranges from 10 kHz to 50 kHz.

7. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1, characterized in that: A second pulley (32) is fixedly mounted on the outer circumference of the rotating drum (3), and the second pulley (32) is coaxial with the rotating drum (3).

8. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 7, characterized in that: The invention also comprises a driving mechanism (9), wherein the driving mechanism (9) comprises a motor (91), a first bevel gear (92), a second bevel gear (93) and a first pulley (95), wherein the first bevel gear (92) is fixedly connected to the output end of the motor (91), the first bevel gear (92) is meshed with the second bevel gear (93), the first bevel gear (92) and the first pulley (95) are fixedly mounted on the same gear shaft (94), and the first pulley (95) and the second pulley (32) are connected in transmission via a synchronous belt (96).

9. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1, characterized in that: The mesh size of the sieve holes (31) on the rotating drum (3) is set to be 100-300 meshes.

10. The device for high temperature treatment of negative electrode sheets of lithium ion batteries according to claim 1 or 4, characterized in that: The recovery part (7) is made of 304 stainless steel.

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