A device and method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration

Abstract

The present disclosure provides a device and method for stripping aluminum foil and positive electrode material from waste lithium-ion batteries based on a fully integrated chain, relating to the technical field of waste lithium-ion battery processing. The device comprises: a freezing mechanism, a positive electrode sheet traction mechanism, a laser heating mechanism, a negative pressure mechanism, and a stripping chamber. The freezing mechanism is disposed outside the stripping chamber and is used to freeze the positive electrode sheet placed on the positive electrode sheet traction mechanism. The positive electrode sheet traction mechanism extends through the stripping chamber. The laser heating mechanism is located within the stripping chamber and faces the positive electrode sheet on the positive electrode sheet traction mechanism. The negative pressure mechanism is located within the stripping chamber and below the positive electrode sheet traction mechanism. A scraper is also provided in the stripping chamber. The scraper is disposed on the upper surface of the positive electrode sheet traction mechanism and contacts the positive electrode sheet to strip the aluminum foil and positive electrode material from the positive electrode sheet. The present disclosure can achieve efficient separation of positive electrode material and aluminum foil, resulting in high-purity recycled materials.

Description

Technical Field

[0001] The present disclosure relates to the technical field of waste lithium-ion battery processing, and in particular to a device and method for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration. Background Art

[0002] The lithium-ion battery industry has experienced rapid growth in recent years. Due to their high energy density and long cycle life, lithium-ion batteries are widely used in a wide range of fields, including consumer electronics, electric vehicles, and chemical energy storage. They are a current research hotspot in the new energy sector. However, with the rapid growth in the application and demand for lithium-ion batteries, a large number of scrapped batteries are inevitably generated.

[0003] Waste lithium-ion batteries contain valuable metals such as nickel, cobalt, manganese, aluminum, and lithium, with the majority of these metals concentrated in the cathode material. They also contain hazardous substances such as electrolytes and binders, which can cause serious environmental damage if improperly handled. Currently, the recovery rate for cathode materials in waste lithium-ion batteries is less than 5%. Therefore, recycling waste lithium-ion batteries has significant economic and environmental implications.

[0004] During the production of lithium-ion battery positive electrodes, the positive electrode material and binder are slurried and evenly coated onto an aluminum foil current collector. The binder securely bonds the positive electrode material to the current collector, maintaining its stability. However, the presence of the binder makes it difficult to separate the positive electrode material from the current collector during the recycling of used batteries.

[0005] Currently, methods for separating positive electrode materials from aluminum foil include mechanical crushing, thermal decomposition, and organic solvent dissolution. Mechanical crushing utilizes the difference in mechanical properties between the positive electrode material and the aluminum foil to separate the positive electrode powder from the foil through mechanical crushing. However, the positive electrode powder is mixed with aluminum, and mechanical crushing increases the difficulty of subsequent separation. Thermal decomposition involves high-temperature heating, directly calcining at 500-600°C to decompose organic matter. Thermal decomposition is the most common and effective method, offering advantages such as simplicity and convenience. However, the thermal decomposition of organic matter releases a large amount of harmful gases, causing air pollution, and high-temperature calcination consumes a lot of energy. Organic solvent dissolution involves soaking the positive electrode sheet in an organic solvent to dissolve the binder, but this method produces a large amount of organic wastewater.

[0006] Therefore, the existing separation technology of positive electrode materials and aluminum foil current collector has problems such as severe environmental pollution, high energy consumption, and low separation rate. It is urgent to develop low-energy, high-efficiency, and environmentally friendly separation technology.

[0007] In view of this, the present disclosure is proposed.

[0008] Public content

[0009] The purpose of the present disclosure is to provide an apparatus and method for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration.

[0010] The present disclosure is achieved as follows:

[0011] In the first aspect, the present disclosure provides a device for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration, which includes: a freezing mechanism, a positive electrode sheet traction mechanism, a laser heating mechanism, a negative pressure mechanism and a stripping chamber, wherein the freezing mechanism is used to freeze the positive electrode sheet, the positive electrode sheet traction mechanism is used to pull the frozen positive electrode sheet into the stripping chamber for stripping, and to pull the stripped aluminum foil out of the stripping chamber; the laser heating mechanism is used to laser heat the positive electrode sheet entering the stripping chamber; a scraper for stripping the aluminum foil and positive electrode material of the positive electrode sheet is provided in the stripping chamber, and the negative pressure mechanism is connected to the stripping chamber for negative pressure collection of the stripped positive electrode material.

[0012] In an optional embodiment, the positive electrode sheet traction mechanism includes a winding roller, an unwinding roller and a support screen, the winding roller and the unwinding roller are located on both sides of the stripping chamber, the positive electrode sheet is wound on the winding roller and the unwinding roller and moves in the direction from the unwinding roller to the winding roller, and the support screen is located in the stripping chamber and is used to support the positive electrode sheet.

[0013] In an optional embodiment, the scraper includes an upper scraper and a lower scraper, and the upper scraper and the lower scraper are respectively arranged on the upper and lower sides of the positive electrode sheet, and the support screen is provided with a knife groove for the lower scraper to extend into the lower surface of the positive electrode sheet at the position corresponding to the lower scraper.

[0014] In an optional embodiment, the positive electrode sheet traction mechanism further includes guide rollers, and the guide rollers are in two groups and are respectively arranged on the upper and lower sides of both ends of the positive electrode sheet outside the stripping chamber.

[0015] In an optional embodiment, a slide rail is provided in the stripping chamber along the width direction of the positive electrode sheet, and the laser heating mechanism is slidably provided on the slide rail.

[0016] In an optional embodiment, the equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration also includes a blower, which is located in the stripping chamber and faces the positive electrode sheet on the positive electrode sheet traction mechanism.

[0017] In an optional embodiment, the equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration also includes a pyrolysis furnace, and the inlet of the pyrolysis furnace is connected to the outlet of the negative pressure mechanism.

[0018] In an optional embodiment, the equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration further includes a dust collection mechanism, which is connected to the outlet of the pyrolysis furnace.

[0019] In an optional embodiment, the equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration further includes an exhaust gas treatment mechanism, which is connected to the air outlet of the dust collection mechanism.

[0020] In an optional embodiment, the waste gas treatment mechanism includes an incineration tower, a heat exchanger, a water spray tower, a bag dust collector, an alkaline spray tower and a demister connected in sequence, and the inlet of the incineration tower is connected to the outlet of the dust collection mechanism.

[0021] In a second aspect, the present disclosure provides a method for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration, which is performed using the device for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration as described in any of the above embodiments, comprising:

[0022] Placing the positive electrode sheet of the waste lithium-ion battery in the freezing mechanism for freezing treatment to obtain a frozen positive electrode sheet;

[0023] Placing the frozen positive electrode sheet on the positive electrode sheet pulling mechanism, and heating the frozen positive electrode sheet by the laser heating mechanism to obtain a heated positive electrode sheet;

[0024] When the heated positive electrode sheet passes through the scraper, the scraper scrapes off the positive electrode material on the surface of the heated positive electrode sheet to expose the aluminum foil;

[0025] The scraped positive electrode material is adsorbed and recovered by the negative pressure mechanism, and the exposed aluminum foil is discharged from the stripping chamber along with the positive electrode sheet pulling mechanism.

[0026] In an optional embodiment, the freezing temperature of the freezing treatment is -60 to -5°C, and the freezing time is 1 to 3 hours.

[0027] In an optional embodiment, the power of the laser heating mechanism is 10-100 W, the wavelength is 805-2000 nm, and the frequency of laser heating is 10-20 kHz.

[0028] In an optional embodiment, the heating time of the laser heating mechanism is 5-30s, and the temperature of the heated positive electrode sheet after heating is 330-500°C.

[0029] In an optional embodiment, the negative pressure of the negative pressure mechanism is -20.0Pa to -0.01Pa.

[0030] In an optional embodiment, after the scraper scrapes the positive electrode material on the surface of the heated positive electrode sheet, the positive electrode material is blown off by a blower installed in the stripping chamber.

[0031] In an optional embodiment, the blower has a power of 1.5-5.5 kW.

[0032] In an optional embodiment, after being adsorbed by the negative pressure mechanism, the positive electrode material is transported to a pyrolysis furnace installed below the negative pressure mechanism for pyrolysis.

[0033] In an optional embodiment, the pyrolysis temperature is 500-600° C., and the pyrolysis time is 1-1.5 h.

[0034] In an optional embodiment, a dust collection device is used to collect the positive electrode material after pyrolysis, and the tail gas enters an exhaust gas treatment mechanism for treatment.

[0035] In an optional embodiment, the waste gas treatment mechanism includes first incinerating the exhaust gas to obtain incineration exhaust gas, recovering heat from the incineration exhaust gas through a heat exchanger to obtain heat exchange exhaust gas, then spraying the heat exchange exhaust gas to obtain spray exhaust gas, passing the spray exhaust gas into a bag dust collector for dust removal, and then passing through an alkaline spray tower to remove acidic gases. The purified exhaust gas is discharged centrally after mist and water separation through a demister.

[0036] In an optional embodiment, the temperature during incineration is 1000-1200°C, the temperature of the heat exchange tail gas is 500-700°C, and the temperature of the spray tail gas is 100-200°C.

[0037] The present disclosure has the following beneficial effects:

[0038] The equipment provided by the present invention for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration uses a freezing mechanism to freeze the positive electrode sheet, and then uses a positive electrode sheet traction mechanism to pull the positive electrode sheet into a stripping chamber, uses a laser heating mechanism in the stripping chamber to heat the frozen positive electrode sheet, and separates it using a scraper. The separated positive electrode material is collected by a negative pressure mechanism. Since the thermal conductivity of the aluminum foil is significantly higher than that of the positive electrode material, under laser heating conditions, the heating rate of the aluminum foil will also be higher than that of the positive electrode material. The binder near the surface of the aluminum foil is easily heated to the decomposition temperature, which quickly reduces the bonding effect of the binder, thereby reducing the bonding force at the contact interface between the positive electrode material and the aluminum foil, and the positive electrode material is easily peeled off from the aluminum foil. In the present disclosure, the temperature difference between the aluminum foil and the positive electrode material is increased by freezing treatment before laser heating, making the heating temperature difference between the positive electrode material and the aluminum foil larger. When the binder reaches the decomposition temperature, the positive electrode material has not yet been decomposed by heat, and is easier to separate from the aluminum foil. The positive electrode material on the surface of the aluminum foil can be fallen off by a scraper, and then the fallen positive electrode material is adsorbed by the effect of negative pressure, thereby achieving efficient separation of the positive electrode material and the aluminum foil, and the recovered material has high purity.

[0039] The present disclosure provides a method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration. Utilizing the above-mentioned equipment for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration, the automatic stripping and collection of positive electrode materials and aluminum foil on the positive electrode sheet can be achieved, and the recovered materials have high purity and high separation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic diagram of the structure of the equipment for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration provided by the present disclosure;

[0042] Figure 2 A schematic diagram of the structure of the support screen in the equipment for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration provided by the present disclosure;

[0043] Figure 3 A schematic flow chart of the method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration provided in the present disclosure.

[0044] Icons: 100-Equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration; 110-Freezing mechanism; 120-Positive electrode sheet traction mechanism; 121-Rewinding roller; 122-Unwinding roller; 123-Supporting screen; 124-Guide roller; 125-Knife groove; 130-Stripping chamber; 131-Scraper; 132-Upper scraper; 133-Lower scraper; 140-Laser heating mechanism; 141-Slide rail; 150-Blower; 160-Negative pressure mechanism; 170-Pyrolysis furnace; 180-Dust collection mechanism; 190-Waste gas treatment mechanism; 200-Positive electrode sheet, 201-Aluminum foil. DETAILED DESCRIPTION

[0045] The embodiments of the present disclosure will be described in detail below with reference to the examples. However, those skilled in the art will appreciate that the following examples are intended only to illustrate the present disclosure and should not be construed as limiting the scope of the present disclosure. Where specific conditions are not specified in the examples, the experiments were performed under conventional conditions or the conditions recommended by the manufacturer. Where the manufacturer of the reagents or instruments is not specified, all are commercially available conventional products.

[0046] The endpoints of the ranges and any values ​​disclosed in this disclosure are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered to be specifically disclosed herein.

[0047] See also Figure 1 and Figure 2 The present disclosure provides a device 100 for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration, which includes: a freezing mechanism 110, a positive electrode sheet traction mechanism 120, a stripping chamber 130, a laser heating mechanism 140, a blower 150, a negative pressure mechanism 160, a pyrolysis furnace 170, a dust collection mechanism 180 and an exhaust gas treatment mechanism 190.

[0048] The freezing mechanism 110 is used to freeze the positive electrode sheet 200. Due to the difference in thermal conductivity between the aluminum foil 201 and the positive electrode material, freezing helps to increase the temperature difference between the two, which is convenient for subsequent heating and stripping. The freezing mechanism 110 can be placed outside the stripping chamber 130 or inside the stripping chamber 130. In the embodiment of the present disclosure, the freezing mechanism 110 is arranged outside the stripping chamber 130, and its structure is the existing technology. As long as it can achieve freezing at a specific temperature (-60 to -5°C), such as a freezer, etc.

[0049] The positive electrode sheet traction mechanism 120 is used to transport the frozen positive electrode sheet 200. In the present disclosure, the positive electrode sheet traction mechanism 120 passes through the stripping chamber 130. The positive electrode sheet traction mechanism 120 includes a winding roller 121, an unwinding roller 122, a support screen 123 and a guide roller 124. The winding roller 121 and the unwinding roller 122 are located on both sides of the stripping chamber 130. The positive electrode sheet 200 is wound around the winding roller 121 and the unwinding roller 122 and moves from the unwinding roller 122 to the winding roller 121. The support screen 123 is located in the stripping chamber 130 and is used to support the positive electrode sheet 200. There are two sets of guide rollers 124, which are respectively arranged on the upper and lower sides of the two ends of the support screen 123 located outside the stripping chamber 130. In the present disclosure, the winding roller 121 and the unwinding roller 122 are used to drive the positive electrode sheet 200 to move, and the support screen 123 can support the positive electrode sheet 200 located in the stripping chamber 130, so as to better enable the subsequent laser heating mechanism 140 to heat and strip the positive electrode sheet 200.

[0050] The stripping chamber 130 is used to strip and output the frozen positive electrode sheets on the positive electrode sheet pulling mechanism 120. A scraper 131 is also provided within the stripping chamber 130. The scraper 131 is disposed on the upper surface of the positive electrode sheet pulling mechanism 120 and contacts the positive electrode sheet 200 to strip the aluminum foil 201 and positive electrode material from the positive electrode sheet 200. The scraper 131 includes an upper scraper 132 and a lower scraper 133, which are disposed on the upper and lower sides of the positive electrode sheet 200, respectively. The support screen 123 is provided with a knife groove 125 corresponding to the position of the lower scraper 133, which allows the lower scraper 133 to extend into the lower surface of the positive electrode sheet 200. In the present disclosure, the upper scraper 132 and the lower scraper 133 can be used to simultaneously scrape the positive electrode material from the upper and lower surfaces of the positive electrode sheet 200. After scraping, the exposed aluminum foil 201 is further transported out of the stripping chamber 130.

[0051] The laser heating mechanism 140 is used to quickly heat the frozen positive electrode sheet on the positive electrode sheet pulling mechanism 120. The laser heating mechanism 140 is located in the stripping chamber 130 and faces the positive electrode sheet 200 on the positive electrode sheet pulling mechanism 120. In the present disclosure, the laser heating mechanism 140 is used to achieve rapid heating of the frozen positive electrode sheet in a short period of time. A slide rail 141 is provided in the stripping chamber 130 along the width direction of the positive electrode sheet 200, and the laser heating mechanism 140 is slidably provided on the slide rail 141. The laser heating mechanism 140 can slide on the slide rail 141 to achieve sliding heating of the frozen positive electrode sheet, which makes the heating more uniform. Through laser heating, the aluminum foil 201 heats up quickly, while the positive electrode material away from the aluminum foil 201 heats up slowly. Therefore, the binder near the surface of the aluminum foil 201 is easily heated to the decomposition temperature, which is beneficial to reduce the bonding force at the contact interface between the positive electrode material and the aluminum foil 201. The positive electrode material on the surface of the aluminum foil 201 can be removed by the scraper 131. In the embodiment of the present disclosure, a typical but non-restrictive specific form of a laser heating mechanism 140 is provided. The laser heating mechanism 140 can be a conventional commercially available laser heater. Other laser devices that can achieve heating at a specific power (10-100W), wavelength (805-2000nm) and frequency (10-20kHz) can be used as the laser heating mechanism 140 of the present disclosure.

[0052] The blower 150 is used to purge the stripped positive electrode material, causing it to fall off the aluminum foil 201. The blower 150 is located within the stripping chamber 130 and faces the positive electrode sheet 200 on the positive electrode sheet pulling mechanism 120. Some of the positive electrode material scraped off by the scraper 131 may remain on the surface of the aluminum foil 201. The blower 150 can purge this portion, blowing it off and collecting it via the subsequent negative pressure mechanism 160.

[0053] The negative pressure mechanism 160 is used to collect the positive electrode material after stripping. The negative pressure mechanism 160 is connected to the stripping chamber 130. The negative pressure mechanism 160 can be located below the positive electrode sheet traction mechanism 120 or on the side of the stripping chamber 130. In the present disclosure, the specific setting position and specific structure of the negative pressure mechanism 160 are subject to specific restrictions. As long as it can realize the collection of the positive electrode material after stripping by using negative pressure, for example, a conventional vacuum pump can also be used as the negative pressure mechanism 160 of the present application. The negative pressure mechanism 160 can use negative pressure to collect the positive electrode material that has been stripped or blown off, which can effectively avoid dust flying. The cooperation of the blower 150 and the negative pressure mechanism 160 can also well collect the positive electrode material on the surface of the aluminum foil 201, and the purity of the aluminum foil 201 is better.

[0054] Pyrolysis furnace 170 is used to pyrolyze the cathode material. In the present disclosure, the inlet of pyrolysis furnace 170 is connected to the outlet of negative pressure mechanism 160. Pyrolysis in the present disclosure is performed under the protection of an inert gas. Pyrolysis can carbonize organic matter such as the binder at high temperatures, fully removing the organic matter and thereby improving the purity of the cathode material.

[0055] The dust collecting mechanism 180 is used to collect the positive electrode material powder generated after pyrolysis. In the present disclosure, the dust collecting mechanism 180 is connected to the outlet of the pyrolysis furnace 170 .

[0056] The exhaust gas treatment mechanism 190 is used to treat the exhaust gas discharged by the dust collection mechanism 180 to achieve purified emissions. In the present disclosure, the exhaust gas treatment mechanism 190 is connected to the air outlet of the dust collection mechanism 180. Specifically, the exhaust gas treatment mechanism 190 includes an incineration tower, a heat exchanger, a water spray tower, a bag dust collector, an alkaline spray tower, and a demister, which are connected in sequence. The incineration tower inlet is connected to the air outlet of the dust collection mechanism 180. The incinerator, heat exchanger, water spray tower, bag filter, alkaline spray tower, and demister are all conventional structures. The incinerator is used to remove organic components from the exhaust gas through high-temperature incineration at a temperature of 1000-1200°C. The exhaust gas passes through a heat exchanger to recover some of the heat, reducing the exhaust temperature to 500-700°C. After the heat exchange, the exhaust gas is rapidly cooled by a large amount of water spray to 100-200°C. The quenched exhaust gas passes through a bag filter to remove dust, and then passes through an alkaline spray tower to remove acidic gases. The purified exhaust gas passes through a demister to separate the mist and water before being discharged centrally.

[0057] In addition, the present disclosure also provides a method for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration, which is performed using the above-mentioned device 100 for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration. Figure 3 , which includes the following steps:

[0058] S1. Place the positive electrode sheet 200 of the waste lithium-ion battery in the freezing mechanism 110 for freezing treatment to obtain a frozen positive electrode sheet; the freezing temperature of the freezing treatment is -60 to -5°C, and the freezing time is 1 to 3 hours.

[0059] S2, placing the frozen positive electrode sheet on the positive electrode sheet pulling mechanism 120, and the positive electrode sheet pulling mechanism 120 pulls the frozen positive electrode sheet into the stripping chamber 130;

[0060] S3. The laser heating mechanism 140 disposed within the stripping chamber 130 heats the frozen positive electrode sheet to obtain a heated positive electrode sheet. The laser heating mechanism 140 has a power of 10-100W, a wavelength of 805-2000nm, and a laser heating frequency of 10-20kHz. The laser heating mechanism 140 heats the positive electrode sheet for 5-30s, and the temperature of the heated positive electrode sheet is 330-500°C.

[0061] S4, when the heated positive electrode sheet passes through the scraper 131, the scraper 131 scrapes off the positive electrode material on the surface of the heated positive electrode sheet, exposing the aluminum foil 201;

[0062] S5. After scraper 131 scrapes the positive electrode material from the surface of the heated positive electrode sheet, blower 150 installed in stripping chamber 130 blows the positive electrode material off. Blower 150 has a power of 1.5-5.5 kW. The scraped and blown positive electrode material is absorbed and recovered by negative pressure mechanism 160. The exposed aluminum foil 201 is discharged from stripping chamber 130 along with the positive electrode sheet pulling mechanism 120. The negative pressure of negative pressure mechanism 160 is -20.0 Pa to -0.01 Pa.

[0063] S6. After being adsorbed by the negative pressure mechanism 160, the positive electrode material is transported to the pyrolysis furnace 170 installed below the negative pressure mechanism 160 for pyrolysis. The pyrolysis temperature is 500-600° C. and the pyrolysis time is 1-1.5 hours.

[0064] S7. The pyrolyzed cathode material is collected by a dust collection device, and the tail gas enters the waste gas treatment mechanism 190 for treatment. The waste gas treatment mechanism 190 includes first incinerating the tail gas at 1000-1200°C to obtain incineration tail gas, recovering heat from the incineration tail gas through a heat exchanger to obtain heat exchange tail gas with a temperature of 500-700°C, then spraying the heat exchange tail gas to obtain spray tail gas with a temperature of 100-200°C, passing the spray tail gas into a bag filter for dust removal, and then passing through an alkaline spray tower to remove acidic gases. The purified tail gas passes through a demister for mist-water separation before being discharged centrally.

[0065] The features and performance of the present disclosure are further described in detail below with reference to the embodiments.

[0066] Example 1

[0067] This embodiment provides a method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, which is performed using a device 100 for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, and specifically includes the following steps:

[0068] S1. Place the positive electrode sheet 200 of the waste lithium-ion battery in the freezing mechanism 110 for freezing treatment to obtain a frozen positive electrode sheet; the freezing temperature of the freezing treatment is -60°C and the freezing time is 1 hour.

[0069] S2. Place the frozen positive electrode sheet on the positive electrode sheet traction mechanism 120, and the positive electrode sheet traction mechanism 120 pulls the frozen positive electrode sheet into the stripping chamber 130; the unwinding roller 122 and the winding roller 121 drive the positive electrode sheet to move, and the support screen 123 supports the positive electrode sheet located in the stripping chamber 130.

[0070] S3. The laser heating mechanism 140 heats the frozen positive electrode sheet. The laser is irradiated on the aluminum foil 201 and moves horizontally back and forth along the width direction of the positive electrode sheet. The laser heating mechanism 140 quickly heats the frozen positive electrode sheet to 500°C with a laser beam with a wavelength of 808nm, a power of 100W, and a frequency of 10kHz. The heating time is 30s to obtain a heated positive electrode sheet.

[0071] S4. When the heated positive electrode sheet passes through the scraper 131, the upper scraper 132 and the lower scraper 133 simultaneously scrape off the positive electrode materials on the upper and lower surfaces of the heated positive electrode sheet, exposing the aluminum foil 201.

[0072] S5. After scraper 131 scrapes the positive electrode material from the surface of the heated positive electrode sheet, blower 150 installed in stripping chamber 130 blows the positive electrode material off the aluminum foil 201 at a power of 5.5 kW. The scraped and blown positive electrode material is adsorbed and recovered by negative pressure mechanism 160 at -20.0 Pa. The exposed aluminum foil 201 is discharged from stripping chamber 130 along with the positive electrode sheet pulling mechanism 120.

[0073] S6. After being adsorbed by the negative pressure mechanism 160, the positive electrode material enters the pyrolysis furnace 170 for pyrolysis. The pyrolysis temperature is 600° C. and the pyrolysis time is 1 hour, so that organic matter such as the binder is carbonized at high temperature.

[0074] S7. The pyrolyzed cathode material is collected by a dust collection device, and the tail gas enters the waste gas treatment unit 190 for treatment. The tail gas is first incinerated at 1200°C to obtain incineration tail gas. The incineration tail gas is then recycled through a heat exchanger to obtain heat exchange tail gas at a temperature of 700°C. The heat exchange tail gas is then sprayed to obtain spray tail gas at a temperature of 200°C. The spray tail gas is passed through a bag filter for dust removal, and then passes through an alkaline spray tower to remove acidic gases. The purified tail gas is then separated from mist and water by a demister before being discharged in a centralized manner.

[0075] Example 2

[0076] This embodiment provides a method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, which is performed using a device 100 for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, and specifically includes the following steps:

[0077] S1. Place the positive electrode sheet 200 of the waste lithium-ion battery in the freezing mechanism 110 for freezing treatment to obtain a frozen positive electrode sheet; the freezing temperature of the freezing treatment is -40°C and the freezing time is 2 hours.

[0078] S2. Place the frozen positive electrode sheet on the positive electrode sheet traction mechanism 120, and the positive electrode sheet traction mechanism 120 pulls the frozen positive electrode sheet into the stripping chamber 130; the unwinding roller 122 and the winding roller 121 drive the positive electrode sheet to move, and the support screen 123 supports the positive electrode sheet located in the stripping chamber 130.

[0079] S3. The laser heating mechanism 140 heats the frozen positive electrode sheet. The laser is irradiated on the aluminum foil 201 and moves horizontally back and forth along the width direction of the positive electrode sheet. The laser heating mechanism 140 quickly heats the frozen positive electrode sheet to 350°C with a laser beam with a wavelength of 915nm, a power of 10W, and a frequency of 15kHz. The heating time is 15s to obtain a heated positive electrode sheet.

[0080] S4. When the heated positive electrode sheet passes through the scraper 131, the upper scraper 132 and the lower scraper 133 simultaneously scrape off the positive electrode materials on the upper and lower surfaces of the heated positive electrode sheet, exposing the aluminum foil 201.

[0081] S5. After scraper 131 scrapes the positive electrode material from the surface of the heated positive electrode sheet, blower 150 installed in stripping chamber 130 blows the positive electrode material off the aluminum foil at a power of 1.5 kW. The scraped and blown positive electrode material is adsorbed and recovered by negative pressure mechanism 160 at -15.0 Pa. The exposed aluminum foil 201 is discharged from stripping chamber 130 along with the positive electrode sheet pulling mechanism 120.

[0082] S6. After being adsorbed by the negative pressure mechanism 160, the positive electrode material enters the pyrolysis furnace 170 for pyrolysis at a temperature of 500° C. for 1.5 hours, so that organic matter such as the binder is carbonized at high temperature.

[0083] S7. The pyrolyzed cathode material is collected by a dust collection device, and the tail gas enters the waste gas treatment mechanism 190 for treatment. The tail gas is first incinerated at 1000°C to obtain incineration tail gas. The incineration tail gas is then recycled through a heat exchanger to obtain heat exchange tail gas at a temperature of 500°C. The heat exchange tail gas is then sprayed to obtain spray tail gas at a temperature below 200°C. The spray tail gas is passed through a bag filter for dust removal, and then passes through an alkaline spray tower to remove acidic gases. The purified tail gas is then separated from mist and water by a demister and discharged in a centralized manner.

[0084] Example 3

[0085] This embodiment provides a method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, which is performed using a device 100 for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, and specifically includes the following steps:

[0086] S1. Place the positive electrode sheet 200 of the waste lithium-ion battery in the freezing mechanism 110 for freezing treatment to obtain a frozen positive electrode sheet; the freezing temperature of the freezing treatment is -20°C and the freezing time is 3 hours.

[0087] S2. Place the frozen positive electrode sheet on the positive electrode sheet traction mechanism 120, and the positive electrode sheet traction mechanism 120 pulls the frozen positive electrode sheet into the stripping chamber 130; the unwinding roller 122 and the winding roller 121 drive the positive electrode sheet to move, and the support screen 123 supports the positive electrode sheet located in the stripping chamber 130.

[0088] S3. The laser heating mechanism 140 heats the frozen positive electrode sheet. The laser is irradiated on the aluminum foil 201 and moves horizontally back and forth along the width direction of the positive electrode sheet. The laser heating mechanism 140 quickly heats the frozen positive electrode sheet to 400°C with a laser beam with a wavelength of 940nm, a power of 50W, and a frequency of 20kHz. The heating time is 5s to obtain a heated positive electrode sheet.

[0089] S4. When the heated positive electrode sheet passes through the scraper 131, the upper scraper 132 and the lower scraper 133 simultaneously scrape off the positive electrode materials on the upper and lower surfaces of the heated positive electrode sheet, exposing the aluminum foil 201.

[0090] S5. After scraper 131 scrapes the positive electrode material from the surface of the heated positive electrode sheet, blower 150 installed in stripping chamber 130 blows the positive electrode material off the aluminum foil 201 at a power of 3 kW. The scraped and blown positive electrode material is adsorbed and recovered by negative pressure mechanism 160 at -10.0 Pa. The exposed aluminum foil 201 is discharged from stripping chamber 130 along with the positive electrode sheet pulling mechanism 120.

[0091] S6. After being adsorbed by the negative pressure mechanism 160, the positive electrode material enters the pyrolysis furnace 170 for pyrolysis. The pyrolysis temperature is 500° C. and the pyrolysis time is 1 hour, so that organic matter such as the binder is carbonized at high temperature.

[0092] S7. The pyrolyzed cathode material is collected by a dust collection device, and the tail gas enters the waste gas treatment unit 190 for treatment. The tail gas is first incinerated at 1100°C to obtain incineration tail gas. The incineration tail gas is then recycled through a heat exchanger to obtain heat exchange tail gas at a temperature of 600°C. The heat exchange tail gas is then sprayed to obtain spray tail gas at a temperature below 200°C. The spray tail gas is passed through a bag filter for dust removal, and then passes through an alkaline spray tower to remove acidic gases. The purified tail gas is then separated from mist and water by a demister and discharged in a centralized manner.

[0093] Comparative Example 1

[0094] This comparative example provides a conventional method for thermal decomposition and stripping of a positive electrode material and aluminum foil, which comprises:

[0095] (1) crushing the waste lithium-ion positive electrode sheet into two sections to obtain 1-10 mm positive electrode sheet fragments;

[0096] (2) Place the cathode fragments in a high-temperature pyrolysis furnace and heat to 600°C under nitrogen protection for 1 hour to decompose the binder;

[0097] (3) After the reaction is completed, cool to room temperature and separate the aluminum foil and the positive electrode material powder.

[0098] Comparative Example 2

[0099] This comparative example is basically the same as Example 1, except that the positive electrode sheet is not subjected to freezing treatment in this comparative example.

[0100] Comparative Example 3

[0101] This comparative example provides a stripping method, which comprises:

[0102] (1) The positive electrode of the waste lithium-ion battery is placed in a freezing mechanism for freezing treatment to obtain a frozen positive electrode; the freezing temperature of the freezing treatment is -60°C and the freezing time is 1 hour.

[0103] (2) The frozen positive electrode sheet is directly dried using a dryer at a drying temperature of 60° C. for 10 h, and the peeled positive electrode active material and aluminum foil are obtained after drying.

[0104] Comparative Example 4

[0105] This comparative example provides a stripping method, which comprises:

[0106] (1) The positive electrode of the waste lithium-ion battery is immersed in water and then placed in a freezing mechanism for freezing treatment to obtain a frozen positive electrode; the freezing temperature of the freezing treatment is -60°C and the freezing time is 1 hour.

[0107] (2) The frozen positive electrode sheet is directly dried using a dryer at a drying temperature of 60° C. for 10 h, and the peeled positive electrode active material and aluminum foil are obtained after drying.

[0108] Comparative Example 5

[0109] This comparative example is basically the same as Example 1, with the only difference being that, in this comparative example, the laser heating mechanism 140 in Example 1 is replaced by a microwave heating mechanism, and the operating parameters of the microwave heating mechanism are a power of 200 W, a frequency of 2.45 GHz, a heating time of 10 min, and a heating temperature of 400°C.

[0110] Experimental example

[0111] The positive electrode materials and aluminum foils separated from the above examples and comparative examples were tested. The test results are shown in the table below:

[0112]

[0113]

[0114] As can be seen from the above table, the present disclosure adopts a method of first freezing and then rapid laser heating, which can effectively separate the aluminum foil 201 and the positive electrode material on the positive electrode sheet. In conjunction with subsequent purging, negative pressure adsorption and pyrolysis furnace operations, the purity of the recovered positive electrode material can reach more than 97.7%, and the purity of the aluminum foil 201 can reach more than 97%, and the separation rate can reach more than 96.3%. However, in Comparative Example 1, the purity of the obtained positive electrode material and aluminum foil 201 is significantly lower than that of Examples 1-3 of the present disclosure, and the separation rate is also significantly lower than that of Examples 1-3 of the present disclosure. Comparative Example 2 omits the freezing operation, so that the temperature difference between the positive electrode material and the aluminum foil 201 is smaller, and the subsequent heating decomposition is more difficult. The purity of the obtained positive electrode material and aluminum foil 201 is significantly lower than that of Examples 1-3 of the present disclosure, and the separation rate is also significantly lower than that of Examples 1-3 of the present disclosure. Comparative Example 3 uses a dryer for low-temperature and long-term drying after freezing, which can reduce the adhesion between the positive electrode material and the binder. Although the positive electrode material and aluminum foil 201 can be screened through a vibrating screen, it is difficult to ensure that there are morphological differences between all positive electrode materials and aluminum foil, resulting in incomplete separation and low purity of the obtained positive electrode material and aluminum foil. In addition, in Comparative Example 4, after soaking in water, the material of the positive electrode material and aluminum foil 201 will be improved to a certain extent, and the separation rate will be improved at the same time, but it still has the problem of Comparative Example 3, which leads to the purity of the obtained positive electrode material and aluminum foil still being significantly lower than that of Examples 1-3 of the present disclosure. Comparative Example 5 uses a microwave heating mechanism for heating, but compared with laser heating, the energy of microwave heating is not concentrated, and it is difficult to quickly increase the surface temperature of the aluminum foil in a short time. The purity of the obtained positive electrode material and aluminum foil 201 is significantly lower than that of Examples 1-3 of the present disclosure, and the separation rate is also significantly lower than that of Examples 1-3 of the present disclosure.

[0115] In summary, the equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration provided by the present invention uses a freezing mechanism to freeze the positive electrode sheet, and then uses a positive electrode sheet traction mechanism to pull the positive electrode sheet into a stripping chamber, and uses a laser heating mechanism in the stripping chamber to heat the frozen positive electrode sheet, and separates it using a scraper, and the separated positive electrode material is collected by a negative pressure mechanism. Since the thermal conductivity of the aluminum foil is significantly higher than that of the positive electrode material, under laser heating conditions, the heating rate of the aluminum foil will also be higher than that of the positive electrode material. The binder near the surface of the aluminum foil is easily heated to the decomposition temperature, which quickly reduces the bonding effect of the binder, thereby reducing the bonding force at the contact interface between the positive electrode material and the aluminum foil, and the positive electrode material is easily peeled off from the aluminum foil. In the present disclosure, the temperature difference between the aluminum foil and the positive electrode material is increased by freezing treatment before laser heating, making the heating temperature difference between the positive electrode material and the aluminum foil larger. When the binder reaches the decomposition temperature, the positive electrode material has not yet been decomposed by heat, and is easier to separate from the aluminum foil. The positive electrode material on the surface of the aluminum foil can be fallen off by a scraper, and then the fallen positive electrode material is adsorbed by the effect of negative pressure, thereby achieving efficient separation of the positive electrode material and the aluminum foil, and the recovered material has high purity.

[0116] The present disclosure provides a method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration. Utilizing the above-mentioned equipment for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration, the automatic stripping and collection of positive electrode materials and aluminum foil on the positive electrode sheet can be achieved, and the recovered materials have high purity and high separation rate.

[0117] The above describes in detail the optional embodiments of the present disclosure, but the present disclosure is not limited thereto. Within the technical concept of the present disclosure, various simple variations of the technical solution of the present disclosure can be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as the contents disclosed by the present disclosure and fall within the scope of protection of the present disclosure.

[0118] Industrial Applicability

[0119] The equipment provided by the present invention for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration uses a freezing mechanism to freeze the positive electrode sheet, and then uses a positive electrode sheet traction mechanism to pull the positive electrode sheet into a stripping chamber, uses a laser heating mechanism in the stripping chamber to heat the frozen positive electrode sheet, and separates it using a scraper. The separated positive electrode material is collected by a negative pressure mechanism. Since the thermal conductivity of the aluminum foil is significantly higher than that of the positive electrode material, under laser heating conditions, the heating rate of the aluminum foil will also be higher than that of the positive electrode material. The binder near the surface of the aluminum foil is easily heated to the decomposition temperature, which quickly reduces the bonding effect of the binder, thereby reducing the bonding force at the contact interface between the positive electrode material and the aluminum foil, and the positive electrode material is easily peeled off from the aluminum foil. In the present disclosure, the temperature difference between the aluminum foil and the positive electrode material is increased by freezing treatment before laser heating, making the heating temperature difference between the positive electrode material and the aluminum foil larger. When the binder reaches the decomposition temperature, the positive electrode material has not yet been decomposed by heat, and is easier to separate from the aluminum foil. The positive electrode material on the surface of the aluminum foil can be fallen off by a scraper, and then the fallen positive electrode material is adsorbed by the effect of negative pressure, thereby achieving efficient separation of the positive electrode material and the aluminum foil, and the recovered material has high purity.

[0120] The present disclosure provides a method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration. Utilizing the above-mentioned equipment for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full-chain integration, the automatic stripping and collection of positive electrode materials and aluminum foil on the positive electrode sheet can be achieved, and the recovered materials have high purity and high separation rate.

Claims

1. A device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, characterized in that: It includes: a freezing mechanism, a positive electrode sheet traction mechanism, a laser heating mechanism, a negative pressure mechanism and a stripping chamber, wherein the freezing mechanism is used to perform freezing treatment on the positive electrode sheet, the positive electrode sheet traction mechanism is used to pull the frozen positive electrode sheet into the stripping chamber for stripping, and pull the stripped aluminum foil out of the stripping chamber; the laser heating mechanism is used to perform laser heating on the positive electrode sheet entering the stripping chamber; a scraper for stripping the aluminum foil and positive electrode material of the positive electrode sheet is provided in the stripping chamber, and the negative pressure mechanism is connected to the stripping chamber for negative pressure collection of the stripped positive electrode material; wherein, the freezing temperature of the freezing treatment is -60~-5℃, and the freezing time is 1~3h; the power of the laser heating mechanism is 10-100W, the wavelength is 805-2000nm, and the frequency of laser heating is 10-20kHz; the heating time of the laser heating mechanism is 5-30s, and the temperature of the heated positive electrode sheet after heating is 330-500℃.

2. The device for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration according to claim 1 is characterized in that: The positive electrode sheet traction mechanism includes a winding roller, an unwinding roller and a supporting screen. The winding roller and the unwinding roller are located on both sides of the stripping chamber. The positive electrode sheet is wound on the winding roller and the unwinding roller and moves from the unwinding roller to the winding roller. The supporting screen is located in the stripping chamber and is used to support the positive electrode sheet.

3. The device for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration according to claim 2 is characterized in that: The scraper includes an upper scraper and a lower scraper, and the upper scraper and the lower scraper are respectively arranged on the upper and lower sides of the positive electrode sheet. The support screen is provided with a knife groove for the lower scraper to extend into the lower surface of the positive electrode sheet at the position corresponding to the lower scraper.

4. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 2, characterized in that: The positive electrode sheet pulling mechanism further includes guide rollers, which are in two groups and are respectively arranged at upper and lower sides of both ends of the positive electrode sheet outside the stripping chamber.

5. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 1 is characterized in that: A slide rail is provided in the stripping chamber along the width direction of the positive electrode sheet, and the laser heating mechanism is slidably provided on the slide rail.

6. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 1 is characterized in that: The equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full chain integration also includes a blower, which is located in the stripping chamber and faces the positive electrode sheet on the positive electrode sheet traction mechanism.

7. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 1 is characterized in that: The equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration also includes a pyrolysis furnace, and the inlet of the pyrolysis furnace is connected to the outlet of the negative pressure mechanism.

8. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 7, characterized in that: The equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration also includes a dust collection mechanism, which is connected to the outlet of the pyrolysis furnace.

9. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 8, characterized in that: The equipment for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration also includes an exhaust gas treatment mechanism, which is connected to the air outlet of the dust collection mechanism.

10. The device for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 9, characterized in that: The waste gas treatment mechanism includes an incineration tower, a heat exchanger, a water spray tower, a bag dust collector, an alkaline spray tower and a demister which are connected in sequence. The inlet of the incineration tower is connected to the air outlet of the dust collection mechanism.

11. A method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration, characterized in that: The method uses the device for stripping aluminum foil and positive electrode materials of waste lithium-ion batteries based on full-chain integration as described in any one of claims 1 to 10, and includes: Placing the positive electrode sheet of the waste lithium-ion battery in the freezing mechanism for freezing treatment to obtain a frozen positive electrode sheet; Placing the frozen positive electrode sheet on the positive electrode sheet pulling mechanism, and heating the frozen positive electrode sheet by the laser heating mechanism to obtain a heated positive electrode sheet; When the heated positive electrode sheet passes through the scraper, the scraper scrapes off the positive electrode material on the surface of the heated positive electrode sheet to expose the aluminum foil; The scraped positive electrode material is adsorbed and recovered by the negative pressure mechanism, and the exposed aluminum foil is discharged from the stripping chamber along with the positive electrode sheet pulling mechanism.

12. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 11, characterized in that: The freezing temperature of the freezing treatment is -60 to -5°C, and the freezing time is 1 to 3 hours.

13. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 11, characterized in that: The power of the laser heating mechanism is 10-100W, the wavelength is 805-2000nm, and the frequency of the laser heating is 10-20kHz.

14. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 13, characterized in that: The heating time of the laser heating mechanism is 5-30s, and the temperature of the heated positive electrode sheet after heating is 330-500°C.

15. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 11, characterized in that: The negative pressure of the negative pressure mechanism is -20.0 Pa~-0.01 Pa.

16. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 11, characterized in that: After the scraper scrapes the positive electrode material on the surface of the heated positive electrode sheet, the positive electrode material is blown off by a blower installed in the stripping chamber.

17. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 16, characterized in that: The power of the blower is 1.5-5.5kW.

18. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 11, characterized in that: After being adsorbed by the negative pressure mechanism, the positive electrode material is transported to a pyrolysis furnace installed below the negative pressure mechanism for pyrolysis.

19. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 18, characterized in that: The pyrolysis temperature is 500-600° C., and the pyrolysis time is 1-1.5 hours.

20. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 18, characterized in that: The positive electrode material after pyrolysis is collected by using a dust collection device, and the tail gas enters the exhaust gas treatment mechanism for treatment.

21. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 20, characterized in that: The waste gas treatment mechanism includes first incinerating the tail gas to obtain incineration tail gas, recovering heat from the incineration tail gas through a heat exchanger to obtain heat exchange tail gas, then spraying the heat exchange tail gas to obtain spray tail gas, passing the spray tail gas into a bag dust collector for dust removal, and then passing through an alkaline spray tower to remove acidic gases. The purified tail gas passes through a demister for mist-water separation and is then discharged in a centralized manner.

22. The method for stripping aluminum foil and positive electrode materials from waste lithium-ion batteries based on full chain integration according to claim 21, characterized in that: The temperature during incineration is 1000-1200°C, the temperature of the heat exchange tail gas is 500-700°C, and the temperature of the spray tail gas is 100-200°C.

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