Battery positive electrode sheet peeling device

Abstract

This utility model relates to the field of waste battery recycling technology, and in particular to a battery positive electrode sheet peeling device, characterized in that it includes a housing, a conveying mechanism, a low-temperature catalytic mechanism, a peeling mechanism, an electric pulse separation system, and a vibration auxiliary component; the interior of the housing is divided into a pre-cooling zone, a low-temperature embrittlement zone, and a peeling zone along the conveying direction of the battery positive electrode sheet; the conveying mechanism is located inside the housing and is used to directionally convey the battery positive electrode sheet within the housing; the low-temperature catalytic mechanism is located in the low-temperature embrittlement zone and is used to cause the adhesive of the battery positive electrode sheet to become embrittled; the peeling mechanism is located in the peeling zone and includes an active material collection component and an aluminum foil support component; the electric pulse separation system connects the active material collection component and the aluminum foil support component and is used to establish a pulsed electric field between the active material collection component and the aluminum foil support component to separate the lithium iron phosphate coating particles of the battery positive electrode sheet located on the aluminum foil support component from the aluminum foil; the vibration auxiliary component is integrated into the aluminum foil support unit.

Description

Technical Field

[0001] This utility model relates to the field of waste battery recycling technology, and in particular to a battery positive electrode stripping device. Background Technology

[0002] With the rapid development of the new energy vehicle industry, a large number of used vehicle lithium batteries are being scrapped, resulting in a huge waste of resources. If these scrapped batteries are not effectively and harmlessly recycled, they will cause serious environmental pollution. During use, some heavy metals and acids / alkalis are sealed inside the battery casing, so they do not affect the environment. However, after long-term mechanical wear and corrosion, these heavy metals and acids / alkalis leak out and enter the soil or water, thus polluting the environment. In addition, heavy metals in the soil or water can also enter the human food chain through various routes. If people live in this environment for a long time, the heavy metals in the batteries will gradually accumulate in the human body, causing chronic poisoning and harming human health.

[0003] Current mainstream battery cathode stripping technologies have significant limitations: mechanical methods involve crushing the electrodes with blades and then sieving to recover active materials and aluminum foil, resulting in low electrode recovery rates; solvent methods rely on NMP solvent immersion, which is not only environmentally friendly and costly, but also consumes a lot of energy, and residual solvents can degrade the performance of recycled materials; pyrolysis methods require high-temperature decomposition of the binder PVDF, which destroys the LiFePO4 crystal structure and is accompanied by the release of toxic fluorides; therefore, there is an urgent need to optimize and upgrade existing technologies to address their shortcomings. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a battery positive electrode stripping device.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery positive electrode sheet stripping device, characterized in that it includes a housing, a conveying mechanism, a low-temperature catalytic mechanism, a stripping mechanism, an electric pulse separation system, and a vibration auxiliary component; the housing is divided into a pre-cooling zone, a low-temperature embrittlement zone, and a stripping zone along the conveying direction of the battery positive electrode sheet; the conveying mechanism is located inside the housing and is used to directionally convey the battery positive electrode sheet within the housing; the low-temperature catalytic mechanism is located in the low-temperature embrittlement zone and is used to cause embrittlement of the adhesive on the battery positive electrode sheet; the stripping mechanism is located in the stripping zone and includes an active material collection component and an aluminum foil support component; the electric pulse separation system connects the active material collection component and the aluminum foil support component and is used to establish a pulsed electric field between the active material collection component and the aluminum foil support component to separate the lithium iron phosphate coating particles of the battery positive electrode sheet located on the aluminum foil support component from the aluminum foil; the vibration auxiliary component is integrated into the aluminum foil support unit and is used to apply mechanical vibration to assist in the separation of the lithium iron phosphate coating particles of the battery positive electrode sheet from the aluminum foil.

[0007] Furthermore, the conveying mechanism includes multiple rollers and a first motor. The multiple rollers are rotatably installed in the housing and arranged through the precooling zone, the low-temperature embrittlement zone and the peeling zone. Adjacent rollers are connected by a synchronous belt, and the output end of the first motor is driven by one of the rollers.

[0008] Furthermore, the low-temperature catalytic mechanism includes a nozzle located in the low-temperature embrittlement zone, which is positioned above the roller and sprays liquid nitrogen onto the surface of the battery positive electrode.

[0009] Furthermore, the peeling mechanism includes a first conveyor wheel, a second conveyor wheel, a titanium alloy mesh collecting plate, an aluminum foil carrying platform, and a second motor; the first and second conveyor wheels are rotatably mounted in the peeling area inside the box; the titanium alloy mesh collecting plate is connected around the first and second conveyor wheels; the aluminum foil carrying platform is located inside the box and below the titanium alloy mesh collecting plate; the second motor is mounted on the box, and the output end of the second motor is drivenly connected to the first or second conveyor wheel.

[0010] Furthermore, the electrical pulse separation system includes a pulse power supply, a first connecting line, and a second connecting line; the pulse power supply is installed on the housing, the titanium alloy mesh collecting plate is electrically connected to the negative terminal of the pulse power supply through the first connecting line, and the aluminum foil carrier platform is electrically connected to the positive terminal of the pulse power supply through the second connecting line.

[0011] Furthermore, the vibration assist component includes a piezoelectric ceramic sheet and a driving power supply; the piezoelectric ceramic sheet is installed inside the aluminum foil support platform and is electrically connected to the driving power supply.

[0012] Furthermore, it also includes a scraper and a collection box. The scraper is installed in the peeling area inside the box and is attached to the outer surface of the titanium alloy mesh collecting plate away from the aluminum foil support platform, for scraping off the coating particles accumulated on the titanium alloy mesh collecting plate. The collection box is located in the peeling area inside the box and below the scraper, for collecting the coating particles scraped off from the titanium alloy mesh collecting plate.

[0013] Furthermore, the upper surface of the aluminum foil carrier platform is designed to be slightly arc-shaped, and the highest point of the upper surface of the aluminum foil carrier platform is flush with the conveying plane formed by the rollers. The width of the battery positive electrode sheet is greater than the width of the aluminum foil carrier platform.

[0014] Furthermore, it also includes a temperature sensor and a control system; the temperature sensor is installed in the low-temperature embrittlement zone inside the chamber to monitor the temperature of the zone in real time; the control system is electrically connected to the temperature sensor and the nozzle and is configured to automatically adjust the liquid nitrogen injection volume of the nozzle according to the monitoring data of the temperature sensor in order to maintain the temperature of the low-temperature embrittlement zone.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Compared with existing technologies, this device uses liquid nitrogen as a cooling medium, and the entire process does not require any chemical solvents, fundamentally avoiding the environmental pollution problems caused by traditional solvent methods, while reducing processing costs to a certain extent; moreover, the low-temperature treatment does not damage the crystal structure of lithium iron phosphate, further improving its recovery efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery positive electrode stripping device proposed in this utility model;

[0018] Figure 2 This is a top view of the rollers in the battery positive electrode stripping device proposed in this utility model;

[0019] Figure 3 This is a top view of the titanium alloy mesh collecting plate in the battery positive electrode stripping device proposed in this utility model.

[0020] Figure 4 This is a side view of the aluminum foil support platform in the battery positive electrode stripping device proposed in this utility model.

[0021] In the diagram: 1-box body, 101-pre-cooling zone, 102-low temperature embrittlement zone, 103-peeling zone, 2-nozzle, 3-temperature sensor, 4-titanium alloy mesh collection plate, 5-aluminum foil support platform, 6-pulse power supply, 61-first connecting line, 62-second connecting line, 7-roller, 8-piezoelectric ceramic sheet, 9-first motor, 10-first conveyor wheel, 11-second conveyor wheel, 12-second motor, 13-scraper, 14-collection box. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-4 As shown, this embodiment provides a battery positive electrode sheet stripping device, characterized in that it includes a housing 1, a conveying mechanism, a low-temperature catalytic mechanism, a stripping mechanism, an electrical pulse separation system, and a vibration auxiliary component; the interior of the housing 1 is sequentially divided into a pre-cooling zone 101, a low-temperature embrittlement zone 102, and a stripping zone 103 along the conveying direction of the battery positive electrode sheet; the conveying mechanism includes multiple rollers 7 and a first motor 9, the multiple rollers are rotatably installed in the housing 1 and arranged through the pre-cooling zone 101, the low-temperature embrittlement zone 102, and the stripping zone 103, adjacent rollers 7 are connected by a synchronous belt, and the output end of the first motor 9 is driven by one of the rollers 7; the low-temperature catalytic mechanism includes a nozzle 2 located in the low-temperature embrittlement zone 102, the nozzle 2 is located above the roller and sprays liquid nitrogen onto the surface of the battery positive electrode sheet; the stripping mechanism includes a first conveying wheel 10, a second conveying wheel 11, a titanium alloy mesh collecting plate 4, an aluminum foil support platform 5, and... A second motor 12; a first conveyor wheel 10 and a second conveyor wheel 11 are rotatably mounted in a stripping zone 103 within a housing 1; a titanium alloy mesh collecting plate 4 is connected around the first conveyor wheel 10 and the second conveyor wheel 11; an aluminum foil carrying platform 5 is located inside the housing 1 and below the titanium alloy mesh collecting plate 4; the second motor 12 is mounted on the housing 1, and the output end of the second motor 12 is drivenly connected to the first conveyor wheel 10 or the second conveyor wheel 11; the electrical pulse separation system includes a pulse power supply 6, a first connecting line 61, and a second connecting line 62; the pulse power supply 6 is mounted on the housing 1, the titanium alloy mesh collecting plate 4 is electrically connected to the negative terminal of the pulse power supply 6 through the first connecting line 61, and the aluminum foil carrying platform 5 is electrically connected to the positive terminal of the pulse power supply 6 through the second connecting line 62; the vibration auxiliary component includes a piezoelectric ceramic sheet 8 and a driving power supply; the piezoelectric ceramic sheet 8 is mounted inside the aluminum foil carrying platform 5 and is electrically connected to the driving power supply.

[0024] During operation, the battery positive electrode sheet is conveyed by multiple rollers 7, passing sequentially through the pre-cooling zone 101 and the low-temperature embrittlement zone 102 to reach the aluminum foil support platform 5 in the peeling zone 103. In the low-temperature embrittlement zone 102, liquid nitrogen sprayed by the nozzle 2 causes cracks to form between the lithium iron phosphate coating of the battery positive electrode sheet and the aluminum foil due to the difference in thermal shrinkage rate. In the peeling zone 103, the pulse power supply 6 applies a high-frequency pulse electric field between the titanium alloy mesh collecting plate 4 and the aluminum foil support platform 5, while the drive power supply drives the piezoelectric ceramic sheet 8 to vibrate the aluminum foil support platform 5. Under the combined action of the high-frequency pulse electric field and vibration, the lithium iron phosphate coating particles of the battery positive electrode sheet on the aluminum foil support platform 5 separate from the aluminum foil, so that the positively charged lithium iron phosphate coating particles are adsorbed onto the negatively charged titanium alloy mesh collecting plate 4, and the separated aluminum foil is then conveyed and output by multiple rollers 7.

[0025] like Figure 1 and Figure 3 As shown, in this embodiment, a scraper 13 is also included. The scraper 13 is installed in the peeling area 103 inside the housing 1 and is attached to the outer surface of the titanium alloy mesh collecting plate 4 away from the aluminum foil support platform 5, for scraping off the coating particles accumulated on the titanium alloy mesh collecting plate 4.

[0026] Specifically, it also includes a scraper 13, which is designed to scrape off the lithium iron phosphate coating particles on the outer upper surface of the titanium alloy mesh collection plate 4, so that the lower surface of the titanium alloy mesh collection plate 4 always maintains sufficient suction efficiency.

[0027] like Figure 1 and Figure 4 As shown, in this embodiment, the upper surface of the aluminum foil carrier platform 5 is designed to be slightly arc-shaped, and the highest point of the upper surface of the aluminum foil carrier platform 5 is flush with the conveying plane formed by the roller 7. The width of the battery positive electrode sheet is greater than the width of the aluminum foil carrier platform 5.

[0028] Specifically, the upper surface of the aluminum foil carrier platform 5 is designed to be slightly arc-shaped and flush with the conveying plane formed by the roller 7. This design allows the edge of the battery positive electrode sheet to hang down naturally during the conveying process, avoiding the accumulation of coating particles at the edge. It also reduces the contact area between the positive electrode sheet material and the aluminum foil carrier platform 5, improves the vibration effect, and further improves the peeling effect.

[0029] like Figure 1 As shown, in this embodiment, a temperature sensor 3 and a control system are also included; the temperature sensor 3 is installed in the low-temperature embrittlement zone 102 inside the housing 1 to monitor the temperature of the zone in real time; the control system is electrically connected to the temperature sensor 3 and the nozzle 2 and is configured to automatically adjust the liquid nitrogen injection volume of the nozzle 2 according to the monitoring data of the temperature sensor 3 in order to maintain the temperature of the low-temperature embrittlement zone 102.

[0030] Specifically, temperature sensor 3 is installed at the center of the low-temperature embrittlement zone 102 to monitor the temperature of the zone in real time; the control system adopts a PLC programmable controller, which automatically adjusts the amount of liquid nitrogen injected according to the feedback signal of temperature sensor 3 to ensure that the temperature of the low-temperature embrittlement zone 102 is stable within the preset range, so as to improve the stability and reliability of the device.

[0031] like Figure 1 and Figure 3 As shown, in this embodiment, a collection box 14 is also included. The collection box 14 is disposed in the peeling area 103 inside the box body 1 and is located below the scraper 13, and is used to collect the coating particles scraped off from the titanium alloy mesh collection plate 4.

[0032] Specifically, by setting up a collection box 14 to collect lithium iron phosphate coated particles scraped off from the titanium alloy mesh collection plate 4, continuous collection of lithium iron phosphate coated particles is achieved, thereby improving the automation level of the device.

[0033] like Figures 1-2 As shown, in this embodiment, the plurality of rollers 7 are located in the precooling zone 101 and the low-temperature embrittlement zone 102, and their surfaces are covered with a low-temperature resistant insulating material layer.

[0034] Specifically, the surface of some rollers 7 located in the pre-cooling zone 101 and the low-temperature embrittlement zone 102 is covered with a low-temperature resistant insulating material layer, which can protect the roller 7 material and prevent the material toughness from decreasing and the surface from cracking due to the low-temperature environment, thereby improving the service life of the rollers 7.

[0035] like Figure 2 and Figure 4 As shown, in this embodiment, the aluminum foil carrier platform 5 is configured to allow the separated aluminum foil to continue to be conveyed and output by the roller 7.

[0036] By enabling the processing and conveying of the positive electrode sheet on the aluminum foil carrier platform 5, the automation level of the device can be improved.

[0037] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0039] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A battery positive electrode stripping device, characterized in that, The system includes a housing (1), a conveying mechanism, a low-temperature catalytic mechanism, a stripping mechanism, an electric pulse separation system, and a vibration auxiliary component. The housing (1) is divided into a pre-cooling zone (101), a low-temperature embrittlement zone (102), and a stripping zone (103) along the conveying direction of the battery positive electrode sheet. The conveying mechanism is located inside the housing (1) and is used to directionally convey the battery positive electrode sheet within the housing (1). The low-temperature catalytic mechanism is located in the low-temperature embrittlement zone (102) and is used to cause the adhesive of the battery positive electrode sheet to become embrittled. The stripping mechanism is located in the stripping zone (103) and includes an active material collection component and an aluminum foil support component. The electric pulse separation system connects the active material collection component and the aluminum foil support component to establish a pulsed electric field between the active material collection component and the aluminum foil support component, so as to separate the lithium iron phosphate coating particles of the battery positive electrode sheet located on the aluminum foil support component from the aluminum foil; the vibration assist component is integrated into the aluminum foil support unit to apply mechanical vibration to assist in the separation of the lithium iron phosphate coating particles of the battery positive electrode sheet from the aluminum foil.

2. The battery positive electrode stripping device according to claim 1, characterized in that, The conveying mechanism includes multiple rollers (7) and a first motor (9). The multiple rollers are rotatably installed in the housing (1) and arranged through the precooling zone (101), the low-temperature embrittlement zone (102) and the peeling zone (103). Adjacent rollers (7) are connected by a synchronous belt. The output end of the first motor (9) is driven by one of the rollers (7).

3. The battery positive electrode stripping device according to claim 1, characterized in that, The low-temperature catalytic mechanism includes a nozzle (2) located in the low-temperature embrittlement zone (102), the nozzle (2) being positioned above the roller and spraying liquid nitrogen onto the surface of the battery positive electrode.

4. The battery positive electrode stripping device according to claim 1, characterized in that, The stripping mechanism includes a first conveyor wheel (10), a second conveyor wheel (11), a titanium alloy mesh collecting plate (4), an aluminum foil carrying platform (5), and a second motor (12); the first conveyor wheel (10) and the second conveyor wheel (11) are rotatably mounted in the stripping area (103) inside the housing (1); the titanium alloy mesh collecting plate (4) is connected around the first conveyor wheel (10) and the second conveyor wheel (11); the aluminum foil carrying platform (5) is located inside the housing (1) and below the titanium alloy mesh collecting plate (4); the second motor (12) is mounted on the housing (1), and the output end of the second motor (12) is drivenly connected to the first conveyor wheel (10) or the second conveyor wheel (11).

5. The battery positive electrode stripping device according to claim 1, characterized in that, The electrical pulse separation system includes a pulse power supply (6), a first connecting line (61) and a second connecting line (62); the pulse power supply (6) is installed on the housing (1), the titanium alloy mesh collection plate (4) is electrically connected to the negative terminal of the pulse power supply (6) through the first connecting line (61), and the aluminum foil carrier platform (5) is electrically connected to the positive terminal of the pulse power supply (6) through the second connecting line (62).

6. The battery positive electrode stripping device according to claim 1, characterized in that, The vibration assist component includes a piezoelectric ceramic sheet (8) and a driving power supply; the piezoelectric ceramic sheet (8) is installed inside the aluminum foil support platform (5) and is electrically connected to the driving power supply.

7. The battery positive electrode stripping device according to claim 4, characterized in that, It also includes a scraper (13) and a collection box (14). The scraper (13) is installed in the peeling area (103) inside the box (1) and is attached to the outer surface of the titanium alloy mesh collection plate (4) away from the aluminum foil support platform (5) for scraping off the coating particles accumulated on the titanium alloy mesh collection plate (4). The collection box (14) is located in the peeling area (103) inside the box (1) and below the scraper (13) for collecting the coating particles scraped off from the titanium alloy mesh collection plate (4).

8. The battery positive electrode stripping device according to claim 4, characterized in that, The upper surface of the aluminum foil support platform (5) is designed to be slightly arc-shaped, and the highest point of the upper surface of the aluminum foil support platform (5) is flush with the conveying plane formed by the roller (7). The width of the positive electrode sheet of the battery is greater than the width of the aluminum foil support platform (5).

9. The battery positive electrode stripping device according to claim 3, characterized in that, It also includes a temperature sensor (3) and a control system; the temperature sensor (3) is installed in the low-temperature embrittlement zone (102) inside the housing (1) to monitor the temperature of the zone in real time; the control system is electrically connected to the temperature sensor (3) and the nozzle (2) and is configured to automatically adjust the liquid nitrogen injection volume of the nozzle (2) according to the monitoring data of the temperature sensor (3) in order to maintain the temperature of the low-temperature embrittlement zone (102).

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