Underwater crushing and recovery system and method for lithium batteries

Abstract

An underwater crushing and recovery system for lithium batteries, comprising a dual-shaft shredder (2). An inner cavity of the dual-shaft shredder (2) is located in a water reservoir (4), and the inner cavity of the dual-shaft shredder (2) is in communication with the water reservoir (4). The water reservoir (4) communicates with a circulating water tank by means of a circulating water pump (11). A material discharging position below the dual-shaft shredder (2) communicates with the circulating water tank by means of a first screw conveyor (3). In the system, lithium batteries are conveyed by means of a belt conveyor into the dual-shaft shredder to undergo preliminary crushing, during which the lithium batteries are covered in water, thereby avoiding the situation in which a large number of crushed particles go flying during crushing of the batteries, and effectively preventing the crushing process from polluting the environment in which processing equipment is located, which would in turn lead to affected environmental safety. Moreover, the crushing cavity of the dual-shaft shredder is arranged within the water reservoir, and dilution of an electrolyte solution with water in the water reservoir causes the batteries to fail, which avoids the generation of sparks from battery crushed particles and the combustion of same resulting from short-circuiting of some of the batteries during crushing, and which can effectively protect environmental safety.

Description

A lithium battery underwater crushing and recovery system and method Technical Field

[0001] The present application relates to the technical field of lithium battery recycling, and specifically to a lithium battery underwater crushing and recycling system and method. Background Art

[0002] Lithium batteries, with their high energy density, lack of memory effect, and excellent electrical performance, have been widely used in electronics, new energy vehicles, energy storage, and other fields. However, with a typical service life of 3 to 8 years, lithium batteries are gradually entering a period of large-scale retirement, creating an urgent need for recycling and disposal.

[0003] When used batteries are recycled, they need to be discharged, crushed, and screened in sequence. Most common waste battery crushing mechanisms use dry crushing, which involves using crushing rollers to shred the batteries, remove the battery shells, and separate the battery shells from the battery cores. Although dry crushing mechanisms can fully peel off the battery shells, this type of equipment can produce a large amount of flying debris and electrolyte leakage when crushing large numbers of batteries. The flying debris and volatile electrolyte can easily contaminate the environment in which the processing equipment is located, affecting environmental safety. Moreover, some used batteries short-circuit during crushing, instantly generating a large amount of heat energy, which in turn causes the battery fragments to spark and burn. This not only damages the crushing end of the crushing mechanism, but also produces waste gas due to the combustion of the electrolyte, affecting environmental safety.

[0004] Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present application provides a lithium battery underwater crushing and recovery system and method to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present application is implemented through the following technical solutions: a lithium battery underwater crushing and recovery system, comprising a double-shaft shredder, the inner cavity of the double-shaft shredder is located in a water reservoir, and the inner cavity of the double-shaft shredder is connected to the water reservoir, the water reservoir is connected to the circulating water tank through a circulating water pump, and the discharge point below the double-shaft shredder is connected to the circulating water tank through a first screw conveyor.

[0007] In one embodiment, the circulating water pool is divided into a primary sedimentation area, a secondary sedimentation area and a clear water area. The clear water area is connected to the inner cavity of the water reservoir through a circulating water pump. The discharge point below the double-axis shredder is connected to the primary sedimentation area through a first screw conveyor. The primary sedimentation area, the secondary sedimentation area and the clear water area are sequentially provided with filter layers.

[0008] In one embodiment, a belt conveyor is provided at the inlet of the double-shaft shredder;

[0009] A slag discharging machine is provided between the outlet of the double-shaft shredder and the first screw conveyor, and the slag discharging machine is partially located in the water reservoir;

[0010] A roller is provided in the water reservoir and is located above the slag discharging machine.

[0011] In one embodiment, the outlet of the slag discharging machine is connected to a powerful crusher, a dehydrator is provided below the powerful crusher, the dehydrator is connected to the outlet of the powerful crusher, and the outlet of the dehydrator is connected to a bucket elevator;

[0012] A second screw conveyor is provided below the dehydrator.

[0013] In one embodiment, the outlet of the second screw conveyor is connected to the inlet of the third screw conveyor, and the outlet of the third screw conveyor is connected to the primary sedimentation area of ​​the circulating water tank.

[0014] In one embodiment, the conveying belt conveyor, the double-shaft shredder, the first screw conveyor, the slag discharger, the powerful crusher, the dehydrator, the second screw conveyor, the third screw conveyor, the bucket elevator, and the circulating water pump are all electrically connected to the control box.

[0015] In one embodiment, the crushing shaft of the double-shaft shredder is rotatably connected to a shaft sleeve, the shaft sleeve is slidably connected to the inner cavity wall of the double-shaft shredder, a driven pulley is fixedly connected to the crushing shaft, the driven pulley is connected to the driving pulley through a belt, the driving pulley is fixedly connected to the output end of the motor, a protective shell is provided outside the motor, the motor and the protective shell are both fixedly connected to a mounting bracket, and the mounting bracket is fixedly connected to the outer side wall of the double-shaft shredder.

[0016] In one embodiment, the shaft sleeve is fixedly connected to a first support leg, the first support leg is rotatably connected to one end of a first elastic telescopic rod, the other end of the first elastic telescopic rod is rotatably connected to a second support leg, and the second support leg is fixedly connected to the mounting frame;

[0017] The protective shell is fixedly connected to a fixing plate, the fixing plate is slidably connected to a slider, the slider is rotatably connected to one end of a connecting rod, and the other end of the connecting rod is rotatably connected to the extended end of the first elastic telescopic rod;

[0018] One end of a second elastic telescopic rod is fixedly connected to the slider, the other end of the second elastic telescopic rod is fixedly connected to a C-shaped frame, a third elastic telescopic rod is symmetrically fixedly connected inside the C-shaped frame, a pressure wheel is rotatably connected to the third elastic telescopic rod, and the belt is located between the symmetrically arranged pressure wheels.

[0019] In one embodiment, an arcuate bevel rack is fixedly connected to the shaft sleeve, and the arcuate bevel rack is meshed with a bevel gear rotatably connected to the connecting frame. A first gear is fixedly connected to the bevel gear, and the first gear is meshed with a second gear. The second gear is fixedly connected to the threaded rod, and the threaded rod is rotatably connected to the connecting frame. The connecting frame is fixedly connected to the first elastic telescopic rod, and a slide is slidably connected to the connecting frame, and a threaded sleeve is fixedly connected to the slide, and the threaded sleeve is threadedly meshed with the threaded rod. One end of a spring is fixedly connected to the threaded sleeve, and the other end of the spring is fixedly connected to the fixed rod, and the fixed rod is fixedly connected to the protruding end of the first elastic telescopic rod.

[0020] A lithium battery underwater crushing and recovery method, which uses a lithium battery underwater crushing and recovery system, includes the following steps:

[0021] S1: The lithium batteries are transported to the double-shaft shredder via a belt conveyor for preliminary crushing. During the preliminary crushing process, the lithium batteries are coated with water;

[0022] S2: After the initial crushing, the lithium batteries are divided into heavy materials and light materials. The heavy materials sink to the slag discharger, and the light materials float on the water surface. The light materials are sent to the slag discharger through the roller. The slag discharger sends both the heavy and light materials to the powerful crusher for secondary crushing.

[0023] S3: Some of the materials that are not sent to the powerful crusher through the slag discharger are sent to the primary sedimentation area of ​​the circulating water pool through the first screw conveyor;

[0024] S4: The material crushed by the powerful crusher enters the dehydrator to complete the dehydration process of the material. The dry material is sent to the next process or collected by the bucket elevator. The dehydrated water is sent to the primary sedimentation area of ​​the circulating water pool through the second and third screw conveyors.

[0025] S5: The water received by the circulating water pool is filtered through the primary sedimentation area and the secondary sedimentation area to form the clean water in the clean water area. The water in the clean water area enters the water reservoir through the circulating water pump and participates in the crushing again.

[0026] Compared with the prior art, this application has at least the following beneficial effects:

[0027] The lithium batteries are transported to the double-shaft shredder via a belt conveyor for preliminary crushing. During the preliminary crushing process, the lithium batteries are coated with water, which prevents a large amount of fragments from splashing during the crushing process, effectively preventing the crushing process from polluting the environment where the processing equipment is located, thereby affecting environmental safety;

[0028] The shredding chamber of the double-shaft shredder is set in a water reservoir. The water in the reservoir dilutes the electrolyte, making the battery ineffective. This avoids the short circuit of some batteries during shredding, which causes sparks and combustion of battery fragments, effectively protecting environmental safety.

[0029] After the initial crushing, the lithium batteries are divided into heavy materials and light materials. The heavy materials sink to the slag discharger, while the light materials float on the water surface. The light materials are sent to the slag discharger through a roller. The slag discharger sends both heavy and light materials to the high-pressure crusher for secondary crushing. Some materials that are not sent to the high-pressure crusher by the slag discharger are sent to the primary sedimentation area of ​​the circulating water pool via the first screw conveyor. The materials crushed by the high-pressure crusher for the second time enter the dehydrator to complete the material dehydration process. The dry materials are sent to the next process or collected by bucket elevators. The dewatered water is sent to the primary sedimentation area of ​​the circulating water pool via the second and third screw conveyors. The received water in the circulating water pool is filtered through the primary and secondary sedimentation areas to form clear water in the clear water area. The water in the clear water area enters the water reservoir through the circulating water pump and participates in the crushing again. The above steps are used to recycle lithium batteries, avoiding battery pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic diagram of the main structure of the present application;

[0031] FIG2 is a schematic top view of the main structure of the present application;

[0032] FIG3 is a schematic front view of the external connection structure of the crushing shaft of the present application;

[0033] FIG4 is an enlarged schematic diagram of the structure at point A in FIG3 of the present application;

[0034] FIG5 is a partial left view schematic diagram of the external connection structure of the crushing shaft of the present application.

[0035] In the figure: 1. Belt conveyor; 2. Double-shaft shredder; 3. First screw conveyor; 4. Water reservoir; 5. Slag discharging machine; 6. Power crusher; 7. Dehydrator; 8. Second screw conveyor; 9. Third screw conveyor; 10. Bucket elevator; 11. Circulating water pump; 12. Control box; 13. Crushing shaft; 14. Driven pulley; 15. Bushing; 16. Belt; 17. First support leg; 18. Second support leg; 19. Mounting bracket; 20. An elastic telescopic rod; 21. a driving pulley; 22. a motor; 23. a protective shell; 24. a fixing plate; 25. a connecting rod; 26. a slider; 27. a second elastic telescopic rod; 28. a C-shaped frame; 29. ​​a third elastic telescopic rod; 30. a pressure wheel; 31. an arc-shaped bevel rack; 32. a bevel gear; 33. a first gear; 34. a second gear; 35. a fixing rod; 36. a spring; 37. a threaded rod; 38. a threaded sleeve; 39. a connecting frame; 40. a slide plate. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0037] Example 1

[0038] Please refer to Figures 1-2. The present application provides a technical solution: a lithium battery underwater crushing and recovery system, including a double-shaft shredder 2, the inner cavity of the double-shaft shredder 2 is located in a water reservoir 4, and the inner cavity of the double-shaft shredder 2 is connected to the water reservoir 4, the water reservoir 4 is connected to a circulating water tank through a circulating water pump 11, and the discharge point below the double-shaft shredder 2 is connected to the circulating water tank through a first screw conveyor 3.

[0039] Optionally, the circulating water pool is divided into a primary sedimentation area, a secondary sedimentation area and a clear water area. The clear water area is connected to the inner cavity of the water reservoir 4 through a circulating water pump 11. The discharge point below the double-axis shredder 2 is connected to the primary sedimentation area through a first screw conveyor 3. The primary sedimentation area, the secondary sedimentation area and the clear water area are sequentially provided with filter layers.

[0040] Optionally, a belt conveyor 1 is provided at the entrance of the double-shaft shredder 2;

[0041] A slag discharging machine 5 is provided between the outlet of the double-shaft shredder 2 and the first screw conveyor 3, and the slag discharging machine 5 is partially located in the water reservoir 4;

[0042] A drum is provided in the water reservoir 4 , and the drum is located above the slag discharging machine 5 .

[0043] Optionally, the outlet of the slag discharging machine 5 is connected to the powerful crusher 6, a dehydrator 7 is provided below the powerful crusher 6, the dehydrator 7 is connected to the outlet of the powerful crusher 6, and the outlet of the dehydrator 7 is connected to the bucket elevator 10;

[0044] A second screw conveyor 8 is provided below the dehydrator 7 .

[0045] Optionally, the outlet of the second screw conveyor 8 is connected to the inlet of the third screw conveyor 9, and the outlet of the third screw conveyor 9 is connected to the primary sedimentation area of ​​the circulating water pool.

[0046] Optionally, the conveying belt conveyor 1, the double-shaft shredder 2, the first screw conveyor 3, the slag discharger 5, the strong crusher 6, the dewatering machine 7, the second screw conveyor 8, the third screw conveyor 9, the bucket elevator 10, and the circulating water pump 11 are all electrically connected to the control box 12.

[0047] A lithium battery underwater crushing and recovery method, which uses a lithium battery underwater crushing and recovery system, includes the following steps:

[0048] S1: The lithium battery is conveyed to the double-shaft shredder 2 via the belt conveyor 1 for preliminary crushing. During the preliminary crushing process, the lithium battery is coated with water;

[0049] S2: After the initial crushing, the lithium batteries are divided into heavy materials and light materials. The heavy materials sink to the slag discharger 5, and the light materials float on the water surface. The light materials are sent to the slag discharger 5 through the roller. The slag discharger 5 sends both the heavy materials and the light materials to the powerful crusher 6 for secondary crushing;

[0050] S3: Some of the materials that are not sent to the powerful crusher 6 by the slag discharger 5 are sent to the primary sedimentation area of ​​the circulating water tank by the first screw conveyor 3;

[0051] S4: The material crushed by the powerful crusher 6 enters the dehydrator 7 to complete the dehydration process of the material. The dry material is sent to the next process or collected by the bucket elevator 10. The dehydrated water is sent to the primary sedimentation area of ​​the circulating water pool through the second screw conveyor 8 and the third screw conveyor 9;

[0052] S5: The water received by the circulating water pool is filtered through the primary sedimentation area and the secondary sedimentation area to form the clean water in the clean water area. The water in the clean water area enters the water reservoir 4 through the circulating water pump 11 and participates in the crushing again.

[0053] The working principle and beneficial effects of the above scheme:

[0054] The lithium battery is conveyed to the double-shaft shredder 2 by the belt conveyor 1 for preliminary crushing. During the preliminary crushing process, the lithium battery is coated with water, which prevents a large amount of fragments from splashing during the crushing process, effectively preventing the crushing process from polluting the environment where the processing equipment is located, thereby affecting environmental safety;

[0055] The shredding chamber of the double-shaft shredder 2 is arranged in the water reservoir 4. The water in the water reservoir 4 dilutes the electrolyte, rendering the battery ineffective. This prevents some batteries from short-circuiting during shredding, causing sparks and combustion from battery fragments, thereby effectively protecting environmental safety.

[0056] After the initial crushing, the lithium batteries are divided into heavy materials and light materials. The heavy materials sink to the slag discharger 5, and the light materials float on the water surface. The light materials are sent to the slag discharger 5 through the roller. The slag discharger 5 sends both the heavy and light materials to the high-pressure crusher 6 for secondary crushing. Some materials that are not sent to the high-pressure crusher 6 by the slag discharger 5 are sent to the primary sedimentation area of ​​the circulating water pool via the first screw conveyor 3. The materials crushed by the high-pressure crusher 6 for the second time enter the dehydrator 7 to complete the dehydration process of the materials. The dry materials are sent to the next process or collected by the bucket elevator 10. The dewatered water is sent to the primary sedimentation area of ​​the circulating water pool via the second screw conveyor 8 and the third screw conveyor 9. The received water of the circulating water pool is filtered through the primary sedimentation area and the secondary sedimentation area to form clean water in the clean water area. The water in the clean water area enters the water reservoir 4 through the circulating water pump 11 and participates in the crushing again. The lithium batteries are recycled through the above steps to avoid battery pollution to the environment.

[0057] Example 2

[0058] Please refer to Figures 2-5. On the basis of Example 1, the crushing shaft 13 of the double-shaft shredder 2 is rotatably connected to the shaft sleeve 15, and the shaft sleeve 15 is slidably connected to the inner cavity wall of the double-shaft shredder 2. A driven pulley 14 is fixedly connected to the crushing shaft 13, and the driven pulley 14 is connected to the driving pulley 21 through a belt 16. The driving pulley 21 is fixedly connected to the output end of the motor 22. A protective shell 23 is provided outside the motor 22. The motor 22 and the protective shell 23 are both fixedly connected to the mounting bracket 19, and the mounting bracket 19 is fixedly connected to the outer wall of the double-shaft shredder 2.

[0059] Optionally, a first support leg 17 is fixedly connected to the shaft sleeve 15, one end of a first elastic telescopic rod 20 is rotatably connected to the first support leg 17, the other end of the first elastic telescopic rod 20 is rotatably connected to the second support leg 18, and the second support leg 18 is fixedly connected to the mounting bracket 19;

[0060] The protective shell 23 is fixedly connected to a fixing plate 24, and a slider 26 is slidably connected to the fixing plate 24. One end of a connecting rod 25 is rotatably connected to the slider 26, and the other end of the connecting rod 25 is rotatably connected to the extended end of the first elastic telescopic rod 20;

[0061] One end of a second elastic telescopic rod 27 is fixedly connected to the slider 26, and the other end of the second elastic telescopic rod 27 is fixedly connected to a C-shaped frame 28. A third elastic telescopic rod 29 is symmetrically fixedly connected inside the C-shaped frame 28, and a pressure wheel 30 is rotatably connected to the third elastic telescopic rod 29. The belt 16 is located between the symmetrically arranged pressure wheels 30.

[0062] Optionally, an arcuate bevel rack 31 is fixedly connected to the shaft sleeve 15, and the arcuate bevel rack 31 is meshed with a bevel gear 32 rotatably connected to the connecting frame 39. The bevel gear 32 is fixedly connected to a first gear 33, and the first gear 33 is meshed with a second gear 34. The second gear 34 is fixedly connected to a threaded rod 37, and the threaded rod 37 is rotatably connected to the connecting frame 39. The connecting frame 39 is fixedly connected to the first elastic telescopic rod 20, and a slide plate 40 is slidably connected to the connecting frame 39, and a threaded sleeve 38 is fixedly connected to the slide plate 40, and the threaded sleeve 38 is threadedly meshed with the threaded rod 37. One end of a spring 36 is fixedly connected to the threaded sleeve 38, and the other end of the spring 36 is fixedly connected to the fixing rod 35, and the fixing rod 35 is fixedly connected to the protruding end of the first elastic telescopic rod 20.

[0063] The working principle and beneficial effects of the above scheme:

[0064] The crushing shaft 13 of the double-shaft shredder 2 crushes the recycled lithium batteries. Since the recycled lithium batteries have different shapes and sizes, when the lithium batteries of different sizes enter the double-shaft shredder 2, in order to ensure that the crushing shaft 13 can adapt to the lithium batteries of different sizes as much as possible, the crushing shaft 13 is movably connected to the side wall of the double-shaft shredder 2. When a large lithium battery enters between the crushing shafts 13, the crushing shaft 13 moves to the side, causing the shaft sleeve 15 to also move to the side. The first elastic telescopic rod 20 and the spring 36 are compressed and shortened, and the first elastic telescopic rod 20 and the spring 36 can make the shaft sleeve 15 move to the side. 5. The crushing shaft 13 is kept as stable as possible. During the sideways movement, the arcuate bevel rack 31 moves relative to the bevel gear 32. The arcuate bevel rack 31 drives the bevel gear 32 to rotate, which in turn rotates the threaded rod 37 through the first gear 33 and the second gear 34. The threaded rod 37 drives the threaded sleeve 38 downward under the transmission action of the threaded structure. The spring 36 shortens, so that the sleeve 15 and the crushing shaft 13 are kept as stable as possible. The above structure increases the stability of the crushing shaft 13 during crushing while meeting the requirements for crushing lithium batteries of different sizes.

[0065] The above principle and effect are based on the fact that the initial position of the threaded sleeve 38 is located in the middle of the screw rod 8, and the initial state of the spring 36 is a free state;

[0066] The crushing shaft 13 is driven by the motor 22. Since the crushing shaft 13 is in an uncertain position, a second elastic telescopic rod 27, a C-shaped frame 28, a third elastic telescopic rod 29, and a pressure wheel 30 are provided to tension the belt 16 for linkage, thereby ensuring the connection between the belt 16 and the crushing shaft 13 and the motor 22. The above structure reduces the vibration of the belt 16, thereby preventing the motor 22 from being damaged by the vibration generated by the movement of the crushing shaft 13 when crushing lithium batteries of different sizes.

[0067] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting this application; the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. Furthermore, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims

1. A lithium battery underwater crushing and recovery system, characterized by: The invention comprises a double-shaft shredder (2), wherein the inner cavity of the double-shaft shredder (2) is located in a water reservoir (4), and the inner cavity of the double-shaft shredder (2) is connected to the water reservoir (4), the water reservoir (4) is connected to a circulating water pool via a circulating water pump (11), and the discharge point below the double-shaft shredder (2) is connected to the circulating water pool via a first screw conveyor (3).

2. The lithium battery underwater crushing and recovery system according to claim 1, characterized in that: The circulating water pool is divided into a primary sedimentation zone, a secondary sedimentation zone and a clean water zone. The clean water zone is connected to the inner cavity of the water reservoir (4) through the circulating water pump (11). The discharge point below the double-shaft shredder (2) is connected to the primary sedimentation zone through the first screw conveyor (3). Filter layers are sequentially arranged between the primary sedimentation zone, the secondary sedimentation zone and the clean water zone.

3. The underwater crushing and recovery system for lithium batteries according to claim 2 is characterized in that: A belt conveyor (1) is provided at the entrance of the double-shaft shredder (2); A slag discharging machine (5) is provided between the outlet of the double-shaft shredder (2) and the first screw conveyor (3), and a portion of the slag discharging machine (5) is located in the water reservoir (4); A roller is arranged in the water reservoir (4), and the roller is located above the slag discharging machine (5).

4. The lithium battery underwater crushing and recovery system according to claim 3, characterized in that: The outlet of the slag discharging machine (5) is connected to a powerful crusher (6), a dewatering machine (7) is arranged below the powerful crusher (6), the dewatering machine (7) is connected to the outlet of the powerful crusher (6), and the outlet of the dewatering machine (7) is connected to a bucket elevator (10); A second screw conveyor (8) is arranged below the dehydrator (7).

5. The lithium battery underwater crushing and recovery system according to claim 4, characterized in that: The outlet of the second screw conveyor (8) is connected to the inlet of the third screw conveyor (9), and the outlet of the third screw conveyor (9) is connected to the primary sedimentation area of ​​the circulating water pool.

6. The lithium battery underwater crushing and recovery system according to claim 5, characterized in that: The conveying belt conveyor (1), the double-shaft shredder (2), the first screw conveyor (3), the slag discharger (5), the high-power crusher (6), the dewatering machine (7), the second screw conveyor (8), the third screw conveyor (9), the bucket elevator (10), and the circulating water pump (11) are all electrically connected to the control box (12).

7. The lithium battery underwater crushing and recovery system according to claim 1, characterized in that: The crushing shaft (13) of the double-shaft shredder (2) is rotatably connected to a shaft sleeve (15), and the shaft sleeve (15) is slidably connected to the inner cavity wall of the double-shaft shredder (2). A driven pulley (14) is fixedly connected to the crushing shaft (13), and the driven pulley (14) is connected to a driving pulley (21) through a belt (16). The driving pulley (21) is fixedly connected to the output end of a motor (22). A protective shell (23) is arranged outside the motor (22). The motor (22) and the protective shell (23) are both fixedly connected to a mounting frame (19), and the mounting frame (19) is fixedly connected to the outer side wall of the double-shaft shredder (2).

8. The lithium battery underwater crushing and recovery system according to claim 7, characterized in that: The shaft sleeve (15) is fixedly connected to a first support leg (17), one end of a first elastic telescopic rod (20) is rotatably connected to the first support leg (17), the other end of the first elastic telescopic rod (20) is rotatably connected to a second support leg (18), and the second support leg (18) is fixedly connected to the mounting frame (19); The protective shell (23) is fixedly connected to a fixing plate (24), the fixing plate (24) is slidably connected to a slider (26), one end of a connecting rod (25) is rotatably connected to the slider (26), and the other end of the connecting rod (25) is rotatably connected to the protruding end of the first elastic telescopic rod (20); One end of a second elastic telescopic rod (27) is fixedly connected to the slider (26), the other end of the second elastic telescopic rod (27) is fixedly connected to a C-shaped frame (28), a third elastic telescopic rod (29) is symmetrically fixedly connected inside the C-shaped frame (28), a pressure wheel (30) is rotatably connected to the third elastic telescopic rod (29), and the belt (16) is located between the symmetrically arranged pressure wheels (30).

9. The lithium battery underwater crushing and recovery system according to claim 8, characterized in that: The shaft sleeve (15) is fixedly connected with an arc-shaped bevel gear rack (31), the arc-shaped bevel gear rack (31) is meshed with a bevel gear (32) rotatably connected to a connecting frame (39), and the bevel gear (32) is fixedly connected with a first gear (33). The first gear (33) is meshed with the second gear (34), the second gear (34) is fixedly connected to the threaded rod (37), the threaded rod (37) is rotatably connected to the connecting frame (39), the connecting frame (39) is fixedly connected to the first elastic telescopic rod (20), a slide plate (40) is slidably connected to the connecting frame (39), a threaded sleeve (38) is fixedly connected to the slide plate (40), the threaded sleeve (38) is threadedly meshed with the threaded rod (37), one end of a spring (36) is fixedly connected to the threaded sleeve (38), the other end of the spring (36) is fixedly connected to a fixed rod (35), and the fixed rod (35) is fixedly connected to the protruding end of the first elastic telescopic rod (20).

10. A method for underwater crushing and recycling of lithium batteries, characterized in that: The lithium battery underwater crushing and recovery method uses a lithium battery underwater crushing and recovery system as described in any one of claims 1 to 9, comprising the following steps: S1: The lithium battery is conveyed to a double-shaft shredder (2) via a belt conveyor (1) for preliminary crushing, during which the lithium battery is coated with water; S2: The lithium batteries that have been initially crushed are divided into heavy materials and light materials. The heavy materials sink to the slag discharging machine (5), while the light materials float on the water surface. The light materials are sent to the slag discharging machine (5) through a roller. The slag discharging machine (5) sends both the heavy materials and the light materials to a powerful crusher (6) for secondary crushing. S3: Part of the material that has not been sent to the powerful crusher (6) through the slag discharging machine (5) is sent to the primary sedimentation area of ​​the circulating water tank through the first screw conveyor (3); S4: the material crushed for the second time by the powerful crusher (6) enters the dehydrator (7) to complete the dehydration process of the material, and the dry material is sent to the next process or collected by the bucket elevator (10), and the dehydrated water is sent to the primary sedimentation area of ​​the circulating water pool through the second screw conveyor (8) and the third screw conveyor (9); S5: The water received by the circulating water pool is filtered through the primary sedimentation zone and the secondary sedimentation zone to form clean water in the clean water zone. The water in the clean water zone enters the water storage tank (4) through the circulating water pump (11) and participates in the crushing again.

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