Flexible disassembling process for blade battery

Abstract

The invention provides a flexible disassembly process for a blade battery, which belongs to the technical field of new energy batteries and comprises the following steps: A, discharging the blade battery to 2.0-3.0 V; b, tearing off the blue film of the battery cell; c, putting the battery with the battery cell blue film torn off into a container, and adding the dispergator composition to completely immerse the battery; d, under the condition of normal temperature, performing soaking treatment for 40-56 hours at the oscillation frequency of 50-70 rpm; and E, disassembling the battery PACK pack, and taking out the lossless battery cell to realize the cyclic recycling of the battery cell. According to the invention, by designing a multifunctional synergistic permeation type dispergator system, the disassembly of the new energy blade battery under the normal temperature condition is realized, and a single battery cell is separated, so that the technical problems that freezing treatment is needed for disassembling the blade battery and the yield of the battery cell disassembled from a battery pack is low in the traditional process are solved; according to the blade battery flexible disassembling process, the disassembling yield is kept to be 96% or above, and the blade battery flexible disassembling process is remarkably superior to a traditional disassembling method.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, specifically to a flexible disassembly process for blade batteries. Background Technology

[0002] With the rapid development of the new energy vehicle industry, blade batteries, as a type of battery with high energy density and high safety, have been widely used in the electric vehicle field. However, with the increase in battery usage, the problem of recycling and disposing of used batteries has become increasingly prominent. How to efficiently and environmentally dismantle and recycle blade batteries has become a key technical challenge that the industry urgently needs to solve.

[0003] Currently, traditional blade battery dismantling processes suffer from the following significant problems: Existing technologies generally rely on freezing methods for battery dismantling, which not only consumes a lot of energy but also causes thermal stress damage to materials, reducing the quality and utilization value of recycled materials; traditional degumming agents have poor penetration capabilities, resulting in low recycling efficiency; conventional degumming processes easily corrode batteries, reducing recycling quality and economic value; traditional methods often require harsh conditions such as freezing or strong acids and alkalis, which not only consume a lot of energy and pose significant environmental risks but also cause irreversible damage to recycled materials; existing degumming agents have short lifespans and poor reusability, significantly increasing recycling costs. Summary of the Invention

[0004] This invention provides a flexible disassembly process for blade batteries, which solves the technical bottleneck problem that requires freezing treatment during the disassembly of blade batteries in existing traditional processes.

[0005] This invention provides a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries, comprising: The main solvent comprises 55-70 parts by weight of N-methylpyrrolidone and 30-45 parts by weight of γ-butyrolactone; The surfactant complex system includes 0.5-3 parts by weight of nonionic surfactant and 0.3-2 parts by weight of zwitterionic surfactant; The coordination complexing agent is 1-5 parts by weight of vinyl acetate-ethylenediamine copolymer; The nano-dispersing stabilizer is 0.3-1.5 parts by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica.

[0006] Preferably, the nonionic surfactant is pentaerythritol polyoxyethylene ether; the zwitterionic surfactant is sulfobetaine.

[0007] Preferably, the vinyl acetate-ethylenediamine copolymer is prepared by reacting vinyl acetate homopolymer with ethylenediamine at 130-150°C for 2-4 hours, and the molar ratio of vinyl acetate units to ethylenediamine units in the vinyl acetate-ethylenediamine copolymer is 1:(0.8-1.2).

[0008] Preferably, the poly(dimethylaminoethyl methacrylate) grafted nano-silica is prepared by the following method: S1. The surface of nano-silica was modified with 3-aminopropyltriethoxysilane to obtain aminated nano-silica; S2. Aminated nano-silica is reacted with 2-bromoisobutyryl bromide to introduce bromo groups on the surface of nano-silica, thus obtaining bromo-modified nano-silica; S3. Using brominated nano-silica as a macromolecular initiator and dimethylaminoethyl methacrylate as a monomer, a grafting polymerization reaction was carried out at 60°C for 4-6 hours under nitrogen protection using atom transfer radical polymerization technology to obtain nano-silica with dimethylaminoethyl methacrylate grafted on its surface.

[0009] Preferably, the particle size of the nano-silica is 20-40 nm.

[0010] Preferably, the pH value of the composition is 7.0-8.0.

[0011] The present invention also provides a method for preparing the above-mentioned degumming agent composition, comprising the following steps: (1) Mix N-methylpyrrolidone and γ-butyrolactone at a predetermined mass ratio, stir at 20-30°C for 25-35 minutes at a stirring speed of 280-320 rpm to form a solvent mixture; (2) Add the nonionic surfactant and the amphoteric surfactant to the solvent mixture obtained in step (1), and stir at 35-45℃ for 25-35 minutes at a stirring speed of 380-420 rpm to dissolve it; (3) Slowly add the vinyl acetate-ethylenediamine copolymer to the solution obtained in step (2) at 55-65℃ and continue stirring for 80-100 minutes until completely dissolved; (4) Poly(dimethylaminoethyl methacrylate) grafted nano-silica is ultrasonically dispersed in the solution obtained in step (3) and stirred for 55-65 minutes to obtain a uniform descaling agent; (5) The degumming agent obtained in step (4) is filtered to remove insoluble matter, and a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries is obtained.

[0012] Preferably, the ultrasonic dispersion in step (4) is performed by ultrasonic treatment with a frequency of 35-45kHz and a power of 250-350W for 10-20 minutes; the filtration in step (5) is performed by a PTFE filter membrane with a pore size of 0.1-0.3μm.

[0013] The flexible disassembly process for blade batteries using the above-mentioned degumming agent composition provided by this invention includes the following steps: A. Discharge the blade battery to 2.0-3.0V; B. Remove the blue film from the battery cell; C. Place the battery with the blue film removed from the cell in a container, add the adhesive removal agent composition, and completely immerse the battery; D. Immerse at room temperature with an oscillation frequency of 50-70 rpm for 40-56 hours; E. Disassemble the battery pack, remove the undamaged battery cells, and realize the recycling and reuse of the battery cells.

[0014] Preferably, the amount of the degumming agent composition in step C is 2-4 times the battery volume; In step D, the battery is gently stirred every 8-16 hours to promote the penetration of the desiccant.

[0015] The present invention has at least the following beneficial effects: This application proposes a flexible disassembly process for blade batteries that does not require freezing. By designing a multifunctional synergistic penetrating degumming agent system, it enables the disassembly of new energy blade batteries at room temperature and separates individual cells, thereby solving the technical problems of freezing treatment required for disassembling blade batteries and the low yield of cells during battery pack disassembly in traditional processes.

[0016] The blade battery flexible disassembly process of this application maintains a disassembly yield of over 96%, which is significantly better than traditional disassembly methods.

[0017] (1) The multifunctional synergistic penetrating degumming agent composition provided by the present invention realizes a flexible disassembly process for blade batteries under normal temperature conditions, without the need for freezing treatment in traditional processes. The degumming time of the embodiments of the present invention is shortened by an average of about 2 hours compared with the comparative example, which significantly simplifies the disassembly process.

[0018] (2) The dissolving efficiency of the blade battery colloid in the embodiment is significantly improved because the synergistic effect of the coordinating complexing agent and the nano-dispersing stabilizer maintains the activity of the solution.

[0019] (3) As can be seen from Table 1, the degumming agent composition of the embodiment exhibits a lower viscosity range, ensuring good flowability of the degumming agent during disassembly, making the operation process more convenient and efficient.

[0020] (4) The thermal stability of the compositions in the examples is generally above 245°C, which improves the application temperature range and safety of the adhesive.

[0021] (5) The blade battery flexible disassembly process implemented in this invention maintains a disassembly yield of over 96%, and can even reach 97.5%, which is significantly better than traditional disassembly methods. Through the design of a multifunctional synergistic penetrating degumming agent system, the technical problems of needing to freeze the blade battery during disassembly and the low yield of the battery cells during battery pack disassembly in traditional processes are solved.

[0022] (6) This invention achieves non-destructive separation and recycling of battery cells through flexible dismantling process, which improves resource utilization efficiency, conforms to the concept of green environmental protection, and is of great significance to promoting the sustainable development of the new energy industry.

[0023] In summary, the flexible disassembly process for blade batteries provided by this invention enables efficient and non-destructive disassembly of blade batteries under normal temperature conditions. It has technical advantages such as short degumming time, high dissolution efficiency, low viscosity, good thermal stability, and high cell yield, providing an efficient and environmentally friendly technical solution for the battery recycling industry. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] The poly(dimethylaminoethyl methacrylate) grafted nano-silica used in this application embodiment was prepared by the following method: 10.0 g of nano-silica was reacted with 5.0 mL of 3-aminopropyltriethoxysilane in 100 mL of anhydrous toluene to obtain aminated nano-silica. 8.0 g of the aminated product was reacted with 3.5 mL of 2-bromoisobutyryl bromide and 4.0 mL of triethylamine in 150 mL of anhydrous dichloromethane to introduce a bromo group. Then, using 5.0 g of brominated nano-silica as a macromolecular initiator, 10.0 mL of di(dimethylaminoethyl methacrylate) as a monomer, 0.3 g of CuBr as a catalyst, and 0.4 mL of PMDETA as a ligand, the reaction was carried out in 80 mL of anhydrous tetrahydrofuran at 60 °C for 5 hours under nitrogen protection to obtain poly(dimethylaminoethyl methacrylate) grafted nano-silica.

[0026] Example 1 This embodiment provides a preparation method for a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries: 60 parts by weight of N-methylpyrrolidone and 40 parts by weight of γ-butyrolactone are mixed and stirred at 25°C for 30 minutes at a stirring speed of 300 rpm to form a solvent mixture; 1.5 parts by weight of pentaerythritol polyoxyethylene ether and 0.8 parts by weight of sulfobetaine are added to the solvent mixture and stirred at 40°C for 30 minutes at a stirring speed of 400 rpm to ensure complete dissolution; 2.5 parts by weight of vinyl acetate-ethylenediamine copolymer are slowly added to the above solution at 60°C and stirred for another 90 minutes until completely dissolved; the solution is treated with ultrasound at a frequency of 40 kHz and a power of 300 W for 15 minutes; 0.8 parts by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica is dispersed in the above solution and stirred for 60 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.2 μm to obtain the degumming agent composition.

[0027] The vinyl acetate-ethylenediamine copolymer is prepared by reacting vinyl acetate homopolymer and ethylenediamine at a molar ratio of 1:1 at 140°C for 3 hours.

[0028] Example 2 This embodiment provides a preparation method for a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries: 55 parts by weight of N-methylpyrrolidone and 45 parts by weight of γ-butyrolactone are mixed and stirred at 20°C for 25 minutes at a stirring speed of 280 rpm to form a solvent mixture; 0.5 parts by weight of pentaerythritol polyoxyethylene ether and 0.3 parts by weight of sulfobetaine are added to the solvent mixture and stirred at 35°C for 25 minutes at a stirring speed of 380 rpm to ensure complete dissolution; 1.0 part by weight of vinyl acetate-ethylenediamine copolymer is slowly added to the above solution at 55°C and stirring is continued for 80 minutes until completely dissolved; ultrasonic treatment at a frequency of 35 kHz and a power of 250 W is used for 10 minutes; 0.3 parts by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica is dispersed in the above solution and stirred for 55 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.1 μm to obtain the degumming agent composition.

[0029] The vinyl acetate-ethylenediamine copolymer was prepared by reacting vinyl acetate homopolymer and ethylenediamine at a molar ratio of 1:0.8 at 130°C for 2 hours.

[0030] Example 3 This embodiment provides a preparation method for a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries: 70 parts by weight of N-methylpyrrolidone and 30 parts by weight of γ-butyrolactone are mixed and stirred at 30°C for 35 minutes at a stirring speed of 320 rpm to form a solvent mixture; 3.0 parts by weight of pentaerythritol polyoxyethylene ether and 2.0 parts by weight of sulfobetaine are added to the solvent mixture and stirred at 45°C for 35 minutes at a stirring speed of 420 rpm to ensure complete dissolution; 5.0 parts by weight of vinyl acetate-ethylenediamine copolymer are slowly added to the above solution at 65°C and stirred for 100 minutes until completely dissolved; the solution is treated with ultrasound at a frequency of 45 kHz and a power of 350 W for 20 minutes; 1.5 parts by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica is dispersed in the above solution and stirred for 65 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.3 μm to obtain the degumming agent composition.

[0031] The vinyl acetate-ethylenediamine copolymer was prepared by reacting vinyl acetate homopolymer and ethylenediamine at a molar ratio of 1:1.2 at 150°C for 4 hours.

[0032] Example 4 This embodiment provides a preparation method for a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries: 65 parts by weight of N-methylpyrrolidone and 35 parts by weight of γ-butyrolactone are mixed and stirred at 27°C for 32 minutes at a stirring speed of 310 rpm to form a solvent mixture; 2.0 parts by weight of pentaerythritol polyoxyethylene ether and 1.2 parts by weight of sulfobetaine are added to the solvent mixture and stirred at 42°C for 32 minutes at a stirring speed of 410 rpm to ensure complete dissolution; 3.5 parts by weight of vinyl acetate-ethylenediamine copolymer are slowly added to the above solution at 62°C and stirred for another 95 minutes until completely dissolved; the solution is treated with ultrasound at a frequency of 42 kHz and a power of 320 W for 17 minutes; 1.0 part by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica is dispersed in the above solution and stirred for 62 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.25 μm to obtain the degumming agent composition.

[0033] The vinyl acetate-ethylenediamine copolymer was prepared by reacting vinyl acetate homopolymer and ethylenediamine at a molar ratio of 1:1.1 at 145°C for 3.5 hours.

[0034] Example 5 This embodiment provides a preparation method for a multifunctional synergistic permeation-type degumming agent composition for flexible disassembly of blade batteries: 62 parts by weight of N-methylpyrrolidone and 38 parts by weight of γ-butyrolactone are mixed and stirred at 23°C for 28 minutes at a stirring speed of 290 rpm to form a solvent mixture; 1.0 part by weight of pentaerythritol polyoxyethylene ether and 0.5 parts by weight of sulfobetaine are added to the solvent mixture and stirred at 38°C for 28 minutes at a stirring speed of 390 rpm to ensure complete dissolution; 2.0 parts by weight of vinyl acetate-ethylenediamine copolymer are slowly added to the above solution at 58°C and stirred for 85 minutes until completely dissolved; the solution is treated with ultrasound at a frequency of 38 kHz and a power of 280 W for 12 minutes; 0.6 parts by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica is dispersed in the above solution and stirred for 58 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.15 μm to obtain the degumming agent composition.

[0035] The vinyl acetate-ethylenediamine copolymer is prepared by reacting vinyl acetate homopolymer with ethylenediamine at 135°C for 2.5 hours, and the molar ratio of vinyl acetate units to ethylenediamine units is 1:0.9.

[0036] Example 6 This embodiment provides a specific example of a flexible battery disassembly process, and the debinding agent composition used is derived from Example 1: Discharge the blade battery to 2.5V, remove the blue film from the cell, and place the battery in a container. Add a degumming agent composition, the amount of which is 3 times the volume of the battery. After adding the degumming agent, ensure that the battery is completely submerged. Soak the battery for 48 hours with an oscillation rate of 60 rpm, gently stirring every 8 hours during the soaking process.

[0037] After disassembling the battery, the yield rate of the battery cells was 98.5%.

[0038] Example 7 This embodiment provides a specific example of a flexible battery disassembly process, and the debinding agent composition used is derived from Example 2: Discharge the blade battery to 2.2V, remove the blue film from the battery cell, place the battery in a container, add a degumming agent composition, the amount of degumming agent is 2.5 times the volume of the battery, oscillate at 65 rpm, soak for 44 hours, and stir gently every 12 hours.

[0039] After disassembly, the yield rate of the battery cells was 97.8%.

[0040] Example 8 This embodiment provides a specific example of a flexible battery disassembly process, and the debinding agent composition used is derived from Example 3: Discharge the blade battery to 2.0V, remove the blue film from the battery cell, place the battery in a container, add a degumming agent composition, the amount of degumming agent is twice the volume of the battery, oscillate at 55 rpm, soak for 56 hours, and stir gently every 10 hours.

[0041] After disassembling the battery, the yield rate of the battery cells was 96.5%.

[0042] Example 9 This embodiment provides a specific example of a flexible battery disassembly process, and the debinding agent composition used is derived from Example 4: The blade battery was discharged to 2.8V, the blue film on the cell was removed, and the battery was placed in a container. A degumming agent composition was added, with the amount of degumming agent being 4 times the volume of the battery. The mixture was oscillated at 50 rpm and soaked for 40 hours, with gentle stirring every 16 hours. After final disassembly, the cell yield rate was 95.2%.

[0043] Example 10 This embodiment provides a specific example of a flexible battery disassembly process, and the debinding agent composition used is derived from Example 5: Discharge the blade battery to 2.3V, remove the blue film from the battery cell, place the battery in a container, add a degumming agent composition, the amount of degumming agent is 3.5 times the volume of the battery, oscillate at 70 rpm, soak for 43 hours, and stir gently every 12 hours.

[0044] After disassembly, the yield rate of the battery cells was 97.5%.

[0045] Comparative Example 1 Compared to Example 1, this comparative example did not include polydimethylaminoethyl methacrylate-grafted nano-silica.

[0046] Preparation of a desiccant composition for flexible disassembly of blade batteries: 60 parts by weight of N-methylpyrrolidone and 40 parts by weight of γ-butyrolactone are mixed and stirred at 25°C for 30 minutes at a stirring speed of 300 rpm to form a solvent mixture; 1.5 parts by weight of pentaerythritol polyoxyethylene ether and 0.8 parts by weight of sulfobetaine are added to the solvent mixture and stirred at 40°C for 30 minutes at a stirring speed of 400 rpm to ensure complete dissolution; 2.5 parts by weight of vinyl acetate-ethylenediamine copolymer are slowly added to the above solution at 60°C and stirring is continued for 90 minutes until completely dissolved; the resulting solution is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.2 μm to obtain the desiccant composition.

[0047] Comparative Example 2 Compared to Example 1, this comparative example did not include the two key components, vinyl acetate-ethylenediamine copolymer. Preparation of a degumming agent composition for flexible disassembly of blade batteries: 60 parts by mass of N-methylpyrrolidone and 40 parts by mass of γ-butyrolactone are mixed and stirred at 25°C for 30 minutes at a stirring speed of 300 rpm to form a solvent mixture; 1.5 parts by mass of pentaerythritol polyoxyethylene ether and 0.8 parts by mass of sulfobetaine are added to the solvent mixture and stirred at 40°C for 30 minutes at a stirring speed of 400 rpm to ensure complete dissolution; the mixture is treated with ultrasound at a frequency of 40 kHz and a power of 300 W for 15 minutes; 0.8 parts by mass of poly(dimethylaminoethyl methacrylate) grafted nano-silica is dispersed in the above solution and stirred for 60 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.2 μm to obtain the degumming agent composition.

[0048] Comparative Example 3 Compared to Example 1, this comparative example replaced the vinyl acetate-ethylenediamine copolymer with ordinary polyvinyl alcohol, and used ordinary unmodified nano silica instead of polydimethylaminoethyl methacrylate grafted nano silica.

[0049] Preparation of a degumming agent composition for flexible disassembly of blade batteries: 60 parts by mass of N-methylpyrrolidone and 40 parts by mass of γ-butyrolactone are mixed and stirred at 25°C for 30 minutes at a stirring speed of 300 rpm to form a solvent mixture; 1.5 parts by mass of pentaerythritol polyoxyethylene ether and 0.8 parts by mass of sulfobetaine are added to the solvent mixture and stirred at 40°C for 30 minutes at a stirring speed of 400 rpm to ensure complete dissolution; 2.5 parts by mass of polyvinyl alcohol are slowly added to the above solution at 60°C and stirring is continued for 90 minutes until completely dissolved; the solution is treated with ultrasound at a frequency of 40 kHz and a power of 300 W for 15 minutes; 0.8 parts by mass of ordinary nano-silica is dispersed in the above solution and stirred for 60 minutes to obtain a uniform degumming agent; the obtained degumming agent is filtered, and insoluble matter is removed using a PTFE filter membrane with a pore size of 0.2 μm to obtain the degumming agent composition.

[0050] Performance testing 1. Debonding time test: Prepare standard blade battery adhesive substrate samples, measure the initial mass, immerse the adhesive substrates in the descaling agent compositions prepared in each example and comparative example, and observe the descaling process periodically at a vibration frequency of 60 rpm and room temperature. Measure the sample mass every 30 minutes until descaling is complete.

[0051] 2. Dissolution efficiency: Record the final dissolved mass of each sample and calculate the dissolution efficiency: (initial mass - final mass) / initial mass × 100%.

[0052] 3. Viscosity test: The viscosity of the degumming agent at 25°C was measured using a rotational viscometer to ensure the accuracy of the flowability evaluation. Each sample was tested three times and the average value was taken.

[0053] 4. Thermal stability assessment: Using a thermogravimetric analyzer, under a nitrogen atmosphere, the thermal weight loss of the sample was measured by heating from 25℃ to 350℃ at a rate of 10℃ / min. The temperature at which significant weight loss began was determined as the thermal stability index.

[0054] Table 1. Performance Test Data of Degumming Agent

[0055] As shown in Table 1, the degumming time of Examples 1-5 was significantly shorter than that of the comparative examples, averaging about 2 hours shorter. This indicates that the optimized degumming agent compositions have higher dissolution efficiency for the blade battery colloids. This is because the presence of nonionic and zwitterionic surfactants improves the penetration and lubrication effect of solvent molecules. Regarding dissolution efficiency, all examples were higher than the comparative examples, with an improvement of approximately 30%–32%. This is because the addition of coordinating complexing agents and nano-dispersing stabilizers maintains solution activity. In viscosity tests, the compositions of the examples exhibited a significantly lower viscosity range, ensuring good flowability during operation, which is significantly better than the relatively high viscosity of the control group. Thermal stability data show that the heat resistance values ​​of the examples are generally above 245°C, which is much higher than the 215°C and 220°C of the comparative examples. This is because the use of polymer grafting and heat annealing processes synergistically improves the thermal stability of the degumming agent compositions.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries, characterized in that, include: The main solvent comprises 55-70 parts by weight of N-methylpyrrolidone and 30-45 parts by weight of γ-butyrolactone; The surfactant complex system includes 0.5-3 parts by weight of nonionic surfactant and 0.3-2 parts by weight of zwitterionic surfactant; The coordination complexing agent is 1-5 parts by weight of vinyl acetate-ethylenediamine copolymer; The nano-dispersing stabilizer is 0.3-1.5 parts by weight of poly(dimethylaminoethyl methacrylate) grafted nano-silica.

2. The degumming agent composition according to claim 1, characterized in that, The nonionic surfactant is pentaerythritol polyoxyethylene ether; the zwitterionic surfactant is sulfobetaine.

3. The degumming agent composition according to claim 1, characterized in that, The vinyl acetate-ethylenediamine copolymer is prepared by reacting vinyl acetate homopolymer with ethylenediamine at 130-150°C for 2-4 hours. The molar ratio of vinyl acetate units to ethylenediamine units in the vinyl acetate-ethylenediamine copolymer is 1:(0.8-1.2).

4. The degumming agent composition according to claim 1, characterized in that, The polydimethylaminoethyl methacrylate-grafted nano-silica was prepared by the following method: S1. The surface of nano-silica was modified with 3-aminopropyltriethoxysilane to obtain aminated nano-silica; S2. Aminated nano-silica is reacted with 2-bromoisobutyryl bromide to introduce bromo groups on the surface of nano-silica, thus obtaining bromo-modified nano-silica; S3. Using brominated nano-silica as a macromolecular initiator and dimethylaminoethyl methacrylate as a monomer, a grafting polymerization reaction was carried out at 60°C under nitrogen protection using atom transfer radical polymerization technology to obtain nano-silica with dimethylaminoethyl methacrylate grafted on its surface.

5. The degumming agent composition according to claim 4, characterized in that, In S3, the reaction time is 4-6 hours.

6. The degumming agent composition according to any one of claims 1 to 5, characterized in that, The pH value of the composition is 7.0-8.

0.

7. A method for preparing a degumming agent composition according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Mix N-methylpyrrolidone and γ-butyrolactone at a predetermined mass ratio, stir at 20-30°C for 25-35 minutes at a stirring speed of 280-320 rpm to form a solvent mixture; (2) Add the nonionic surfactant and the amphoteric surfactant to the solvent mixture obtained in step (1), and stir at 35-45℃ for 25-35 minutes at a stirring speed of 380-420 rpm to dissolve it; (3) Slowly add the vinyl acetate-ethylenediamine copolymer to the solution obtained in step (2) at 55-65℃ and continue stirring for 80-100 minutes until completely dissolved; (4) Poly(dimethylaminoethyl methacrylate) grafted nano-silica is ultrasonically dispersed in the solution obtained in step (3) and stirred for 55-65 minutes to obtain a uniform descaling agent; (5) The degumming agent obtained in step (4) is filtered to remove insoluble matter, and a multifunctional synergistic penetrating degumming agent composition for flexible disassembly of blade batteries is obtained.

8. The preparation method according to claim 7, characterized in that, The ultrasonic dispersion in step (4) uses ultrasonic treatment with a frequency of 35-45kHz and a power of 250-350W for 10-20 minutes; the filtration in step (5) uses a PTFE filter membrane with a pore size of 0.1-0.3μm.

9. A process for flexibly disassembling blade batteries using a degumming agent composition as described in any one of claims 1 to 6, characterized in that, Includes the following steps: A. Discharge the blade battery to 2.0-3.0V; B. Remove the blue film from the battery cell; C. Place the battery with the blue film removed from the cell in a container, add the adhesive removal agent composition, and completely immerse the battery; D. Immerse at room temperature with an oscillation frequency of 50-70 rpm for 40-56 hours; E. Disassemble the battery pack, remove the undamaged battery cells, and realize the recycling and reuse of the battery cells.

10. The method according to claim 9, characterized in that, The amount of the degumming agent composition used in step C is 2-4 times the battery volume; In step D, the battery is gently stirred every 8-16 hours to promote the penetration of the desiccant.

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