Lithium battery recycling device and processing process thereof

Abstract

The application is suitable for the technical field of lithium battery recycling, and provides a lithium battery recycling device and a processing technology thereof, which comprises a workbench, a discharging conveying mechanism, a square shell punching assembly, the clamping and carrying tool comprises a stand installed on the top of the workbench, a first electric sliding rail installed on one side of the stand, a sliding seat sliding on one side of the first electric sliding rail, a supporting plate sliding on the side wall of the sliding seat, and a double-shaft air cylinder sliding below the supporting plate, the device solves the problem that the square shell is deformed due to collision before battery pack recycling, metal protruding burrs are generated after cutting, and the separator and the pole piece are scratched, and the recycling connection smoothness is reduced, the device detects the square shell deformation defects through a test camera, adjusts the cutting direction so that the defects are always upward, cooperates with the positioning and blocking effect of the positioning plate in the separation mechanism, so that the two layers of battery cells are pushed out horizontally from top to bottom, the square shell cutout, the sharp, the deformation part and the separator and the pole piece are avoided to be extruded and scraped, and the damage in the disassembly process is reduced.

Description

Technical Field

[0001] This invention relates to the field of lithium battery recycling technology, and more specifically, to a lithium battery recycling and processing device and its processing technology. Background Technology

[0002] Lithium batteries are energy storage devices in the new energy field, widely used in new energy vehicles, energy storage systems, consumer electronics and other scenarios. Their core is composed of key components such as cells, separators and electrodes. As the amount of scrapped lithium batteries increases year by year, lithium battery recycling can not only realize the recycling of scarce resources such as lithium, cobalt and nickel, but also avoid the pollution of the environment by harmful substances in waste batteries. It is a key link in the sustainable development of the new energy industry.

[0003] One of the key steps in lithium battery recycling is to disassemble the lithium battery pack casing and separate the core components. During recycling, the battery pack needs to be pre-treated first. Then, a cutting device is used to cut open the metal square shell at the tail and head to expose the internal cells and the lithium battery separator and electrode plates wrapped around the cells. The cells will enter the subsequent recycling channel separately for targeted material extraction and regeneration, while the separator and electrode plates need to be recycled according to their materials.

[0004] If the battery pack has been impacted or collided before recycling, the prismatic shell will deform, directly affecting the efficiency of subsequent disassembly of the separator and electrode. During the cutting process of the prismatic shell, sharp metal protrusions are easily generated at the cut, which will become obstacles in the disassembly process. When the separator and electrode are taken out, they will be squeezed against the deformed and collapsed opening of the prismatic shell. At this time, the burrs can easily tear and damage the separator and electrode. Later, the separator and electrode need to be recycled completely by unwinding. Damage will directly reduce the smoothness of the recycling process. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a lithium battery recycling and processing device and its processing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery recycling and processing device, including a workbench.

[0007] The discharge conveying mechanism is used to transport the disassembled square shells.

[0008] A square shell punching assembly is used for punching the tail of a square shell.

[0009] The clamping and handling fixture includes a stand installed on the top of the workbench, a first electric slide rail installed on one side of the stand, a slide block sliding on one side of the first electric slide rail, a support plate sliding on the side wall of the slide block, and a dual-axis cylinder sliding below the support plate. The piston rod end of the dual-axis cylinder is connected to a clamping arm, and a test camera for testing defects in square shells is installed below the support plate.

[0010] An auxiliary disassembly assembly includes an adjustment mechanism and an auxiliary mechanism installed on the top of the workbench and located on both sides of the discharge conveying mechanism.

[0011] Rotary cutting assembly for rotary cutting of the head of the shell.

[0012] The disassembly assembly includes an ejection mechanism and a separation mechanism mounted on the top of the worktable, the ejection mechanism and the separation mechanism being arranged opposite to each other.

[0013] The present invention is further configured such that: a feeding conveying mechanism is provided on the top of the workbench, one end of the feeding conveying mechanism extends to one side of the square shell punching assembly, a branch conveying mechanism is provided on one side of the workbench, the feeding conveying mechanism and the branch conveying mechanism are arranged opposite to each other, one end of the branch conveying mechanism extends to one side of the separating mechanism, and the conveying direction of the branch conveying mechanism corresponds to the pushing direction of the pushing mechanism.

[0014] The present invention is further configured such that: the square shell punching assembly includes a punching frame installed on the top of the workbench, a punching cylinder is installed on the top of the punching frame, a blade holder is connected to the bottom end of the piston rod of the punching cylinder, and a punching blade is installed at the bottom of the blade holder.

[0015] The top of the workbench is equipped with a guide rail, and a movable frame is slidably connected to the top of the guide rail. The movable frame is positioned opposite one end of the feeding and conveying mechanism. Two rotary pressing cylinders are symmetrically installed on the top of the movable frame, and the two rotary pressing cylinders are arranged along the conveying direction of the feeding and conveying mechanism.

[0016] The present invention is further configured such that: the clamping and handling fixture also includes a lifting cylinder installed on the top of the slide block, the piston rod of the lifting cylinder is connected to the support plate, the bottom of the support plate is equipped with a second electric slide rail, and the dual-axis cylinder slides on the bottom of the second electric slide rail.

[0017] The present invention is further configured such that: the adjustment mechanism includes a movable slide rail installed on the top of the worktable, a lifting slide rail slidably connected to the top of the movable slide rail, a rotary cylinder slidably connected to one side of the lifting slide rail, an adjustment plate installed at the output end of the rotary cylinder, a clamping cylinder installed at one side of the adjustment plate, and a clamping plate installed at the output end of the clamping cylinder.

[0018] The driving direction of the movable slide rail is the same as the conveying direction of the discharge conveying mechanism, and the lifting slide rail can be used to drive the rotary cylinder to move and lift.

[0019] The invention is further configured such that: the auxiliary mechanism includes a vertical plate installed on the top of the workbench, the vertical plate is disposed opposite to the adjustment mechanism, one side of the discharge conveying mechanism extends between the adjustment mechanism and the auxiliary mechanism, a swing plate is hinged to the top of the vertical plate, an auxiliary cylinder is vertically installed on the side of the vertical plate away from the discharge conveying mechanism, the piston rod end of the auxiliary cylinder is hinged to one side of the swing plate, a swing seat is installed on one side of the swing plate, and a housing is rotatably connected to one side of the swing seat via a damping shaft.

[0020] The present invention is further configured such that: the rotary cutting assembly is installed on the top of the workbench and located at the end of the discharge conveying mechanism; the rotary cutting assembly includes a fixed frame installed on the top of the workbench and a displacement cylinder horizontally installed on the top of the fixed frame; a rotary cutting frame is installed at the piston rod end of the displacement cylinder; a rotary cutting motor is installed on one side of the rotary cutting frame; and a rotary cutting blade is installed at the output end of the rotary cutting motor.

[0021] The present invention is further configured such that: the ejection mechanism and the separation mechanism are located on both sides of the discharge conveying mechanism, the height of the ejection mechanism is higher than the top height of the discharge conveying mechanism, the ejection mechanism is arranged on the same side as the adjustment mechanism, and the separation mechanism is arranged on the same side as the auxiliary mechanism.

[0022] The separation mechanism includes a base frame mounted on the top of the workbench, a U-shaped frame mounted on the top of the base frame, an extension plate mounted on the top of the U-shaped frame, the extension plate extending above the discharge conveying mechanism, a pressing cylinder mounted on the top of the extension plate, and the piston rod end of the pressing cylinder penetrating through the top of the extension plate and connected to a positioning plate.

[0023] The present invention is further configured such that: a pushing cylinder is installed on the top of the U-shaped frame, the pushing cylinder is positioned toward the ejection mechanism, a connecting plate is connected to the piston rod end of the pushing cylinder, a separating frame is installed on the side wall of the connecting plate, and a separating strip is connected to the bottom of the separating frame and the side facing the ejection mechanism.

[0024] A lithium battery recycling process, using a lithium battery recycling apparatus as described above, includes the following steps:

[0025] S1. Place the square lithium battery pack to be disassembled on top of the feeding and conveying mechanism, with the electrodes placed on the same side. When the feeding and conveying mechanism transports the square lithium battery pack to the bottom of the clamping and handling fixture, the clamping and handling fixture clamps the square lithium battery pack and places it on top of the square punching assembly for tail cutting.

[0026] S2. After the tail of the prismatic lithium battery pack is cut, the clamping and transporting fixture picks up the tail-cut prismatic lithium battery pack and moves it to the position of the adjusting mechanism and the auxiliary mechanism. At the same time, the clamping and transporting fixture detects defects on the surface of the prismatic lithium battery pack. When the prismatic lithium battery pack reaches the position of the adjusting mechanism and the auxiliary mechanism, the head of the prismatic lithium battery pack is inserted into the auxiliary mechanism, and the adjusting mechanism clamps the prismatic lithium battery pack. Then the clamping and transporting fixture moves away. If the clamping and transporting fixture detects a defect, the prismatic lithium battery pack remains stationary. If the clamping and transporting fixture does not detect a defect, the adjusting mechanism rotates the prismatic lithium battery pack 180 degrees and keeps it stationary in preparation for circumferential cutting.

[0027] S3. The rotary cutting assembly starts and moves towards the square lithium battery pack. When the rotary cutting assembly starts cutting the square shell, the positioning mechanism drives the square lithium battery pack to rotate. During the rotation, the positioning mechanism drives the square lithium battery pack to adaptively adjust its position, thereby maintaining the depth of the rotary cutting assembly inside the square shell. The circumferential cutting operation is completed after the square lithium battery pack has rotated one revolution.

[0028] S4. After the ring cutting is completed, the positioning mechanism places the square lithium battery pack downwards on top of the discharge conveyor and conveys it. The auxiliary mechanism places the cut head residue of the square lithium battery pack on top of the discharge conveyor and conveys it. The discharge conveyor and conveys the square lithium battery pack forward to the disassembly assembly position. The separation mechanism positions the conveyed square lithium battery pack, while the ejection mechanism ejects the two layers of cells inside the square lithium battery pack from bottom to top to the branch conveyor position for discharge. The remaining square cells can continue to be conveyed forward by the discharge conveyor and conveyor.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] (1) By testing the deformation defects of the square shell with a test camera, the circumferential cutting direction is adjusted so that the defects always face upward. Combined with the positioning and blocking effect of the positioning plate in the separation mechanism, the two layers of cells are pushed out horizontally from top to bottom in sequence, avoiding squeezing and scraping of the square shell cut, thorns, deformation parts and diaphragm and electrode, reducing the damage during disassembly, and ensuring the structural integrity of the recycled materials.

[0031] (2) By using the separation strip to block the two layers of cells, the sticky part is scraped and cut at the same time when the lower layer of cells is pushed out, reducing the tearing of the two layers of cells when they are about to separate, ensuring the smoothness of the subsequent unwinding and recycling of the separator and the electrode, and improving the stability of the overall recycling process.

[0032] (3) The auxiliary mechanism assists in positioning the head of the lithium battery pack in the square shell. With the clamping and position matching of the adjustment mechanism, it reduces shaking during cutting, avoids irregular edge breakage and excessive spikes, ensures the integrity of the battery cell ejection, and realizes the automatic falling off of head residue, improving cutting quality and work continuity. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a lithium battery recycling and processing device according to the present invention.

[0034] Figure 2 This is a schematic diagram of the shell punching assembly structure of the present invention.

[0035] Figure 3 This is a schematic diagram of the clamping and handling fixture structure in this invention.

[0036] Figure 4 for Figure 3 A schematic diagram of the structure viewed from below.

[0037] Figure 5 This is a schematic diagram of the cooperative structure of the auxiliary disassembly component and the disassembly component in this invention.

[0038] Figure 6 for Figure 5 A partial side view of the structure.

[0039] Figure 7 This is a schematic diagram of the separation mechanism in this invention.

[0040] Figure 8 for Figure 7 A partial side view of the structure.

[0041] Figure 9 This is a schematic diagram showing the state of the shell after cutting is completed according to the present invention.

[0042] Figure 10 This is a schematic diagram of the combined structure of the auxiliary disassembly component and the rotary cutting component in this invention.

[0043] Explanation of reference numerals in the attached drawings: 1. Workbench; 2. Feeding and conveying mechanism; 3. Discharge and conveying mechanism; 4. Branch conveying mechanism;

[0044] 5. Square shell punching assembly; 51. Punching frame; 52. Punching cylinder; 53. Blade holder; 54. Punching blade; 55. Guide rail; 56. Moving frame; 57. Rotary clamping cylinder;

[0045] 6. Clamping and handling fixture; 61. Stand; 62. First electric slide rail; 63. Slide base; 64. Lifting cylinder; 65. Support plate; 66. Second electric slide rail; 67. Dual-axis cylinder; 68. Clamping arm; 69. Test camera;

[0046] 7. Auxiliary disassembly components; 71. Adjustment mechanism; 711. Moving slide rail; 712. Lifting slide rail; 713. Rotary cylinder; 714. Adjustment plate; 715. Clamping cylinder; 716. Clamping plate;

[0047] 72. Auxiliary mechanism; 721. Vertical plate; 722. Auxiliary cylinder; 723. Swing plate; 724. Swing seat; 725. Shell;

[0048] 8. Rotary cutting assembly; 81. Fixing frame; 82. Displacement cylinder; 83. Rotary cutting frame; 84. Rotary cutting motor; 85. Rotary cutting blade;

[0049] 9. Disassembled components; 91. Ejection mechanism;

[0050] 92. Separation mechanism; 921. Base frame; 922. U-shaped frame; 923. Push cylinder; 924. Connecting plate; 925. Separation frame; 926. Extension plate; 927. Pressing cylinder; 928. Separation bar. Detailed Implementation

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0053] Please see Figures 1-10 The present invention provides the following technical solutions:

[0054] Example 1, see Figure 1 and Figure 5 A lithium battery recycling and processing device includes a workbench 1. A feeding conveyor 2 and a discharging conveyor 3 are provided on the top of the workbench 1. A branch conveyor 4 is provided on one side of the workbench 1. The feeding conveyor 2 and the discharging conveyor 3 are arranged side by side with opposite conveying directions. The feeding conveyor 2 and the branch conveyor 4 are arranged in a staggered manner. The feeding conveyor 2 is used to feed and convey the prismatic lithium battery packs that need to be disassembled. The discharging conveyor 3 is used to convey and discharge the disassembled prismatic packs and the residual material at the head. The branch conveyor 4 is used to branch and convey the internal cells of the prismatic packs and the lithium battery separators and electrodes that wrap the cells.

[0055] See Figure 1 and Figure 2The top of the workbench 1 is equipped with a square shell punching assembly 5 and a clamping and transporting fixture 6. The clamping and transporting fixture 6 is used to pick up the square shell lithium battery pack from the top of the feeding and conveying mechanism 2 and place it on the square shell punching assembly 5 for tail cutting. The specific structure of the clamping and transporting fixture 6 is as follows:

[0056] See Figures 3-4 The clamping and handling fixture 6 includes a stand 61 mounted on the top of the workbench 1, a first electric slide rail 62 mounted on one side of the stand 61, a slide block 63 sliding on one side of the first electric slide rail 62, a support plate 65 sliding on the side wall of the slide block 63, and a dual-axis cylinder 67 sliding below the support plate 65. The piston rod end of the dual-axis cylinder 67 is connected to a clamping arm 68. A lifting cylinder 64 is mounted on the top of the slide block 63. The piston rod of the lifting cylinder 64 is connected to the support plate 65. A second electric slide rail 66 is mounted on the bottom of the support plate 65. The dual-axis cylinder 67 slides on the bottom of the second electric slide rail 66. The first electric slide rail 62 can be a stepper motor linear slide rail slide table module, which is not specifically limited here. The slide table of the first electric slide rail 62 is connected to the slide base 63. When the first electric slide rail 62 is started, the slide table of the first electric slide rail 62 drives the slide base 63 to move synchronously. When the slide base 63 moves, it drives the support plate 65, the dual-axis cylinder 67 and the clamping arm 68 to move synchronously. The lifting cylinder 64 is used to drive the support plate 65, the dual-axis cylinder 67 and the clamping arm 68 to lift and adjust the height. The second electric slide rail 66 can be a stepper motor linear slide rail slide table module, which is not specifically limited here. The second electric slide rail 66 is used to drive the dual-axis cylinder 67 and the clamping arm 68 to move, thereby adjusting the position of the clamping arm 68, so that the clamping arm 68 can switch positions between the feeding and conveying mechanism 2 and the square shell punching assembly 5.

[0057] Specifically, the prismatic lithium battery pack to be disassembled is placed on top of the feeding and conveying mechanism 2, with the electrodes placed on the same side. When the feeding and conveying mechanism 2 transports the prismatic lithium battery pack to the bottom of the clamping and handling fixture 6, the first electric slide rail 62 drives the slide block 63, support plate 65, second electric slide rail 66, dual-axis cylinder 67, and clamping arm 68 to move synchronously towards the feeding and conveying mechanism 2. Subsequently, the second electric slide rail 66 drives the dual-axis cylinder 67 and clamping arm 68 to move above the feeding and conveying mechanism 2. Then, the lifting cylinder 64 drives the support plate 65, second electric slide rail 66, dual-axis cylinder 67, and clamping arm 68 to move downward as a whole, causing the two clamping arms 68 to move to the side wall position of the prismatic lithium battery pack. The dual-axis cylinder 67 drives the two clamping arms 68 to move closer to each other to clamp the prismatic lithium battery pack. Then, through the cooperation of the second electric slide rail 66 and the lifting cylinder 64, the prismatic lithium battery pack is lifted and placed on top of the prismatic punching assembly 5 for cutting.

[0058] See Figure 2 The specific structure of the square shell punching component 5 is as follows:

[0059] The square shell punching assembly 5 includes a punching frame 51 mounted on the top of the workbench 1. A punching cylinder 52 is mounted on the top of the punching frame 51. A blade holder 53 is connected to the bottom end of the piston rod of the punching cylinder 52. A punching blade 54 is mounted on the bottom of the blade holder 53. The punching cylinder 52 is used to push the blade holder 53 and the punching blade 54 to move up and down, so that the punching blade 54 can cut the tail of the square shell lithium battery pack.

[0060] A guide rail 55 is installed on the top of the workbench 1. A movable frame 56 is slidably connected to the top of the guide rail 55. The movable frame 56 is positioned opposite one end of the feeding and conveying mechanism 2. Two rotary clamping cylinders 57 are symmetrically installed on the top of the movable frame 56. The two rotary clamping cylinders 57 are arranged along the conveying direction of the feeding and conveying mechanism 2. The movable frame 56 is used to place the square lithium battery pack. When the square lithium battery pack is placed on the top of the movable frame 56, the two rotary clamping cylinders 57 clamp the square lithium battery pack. The movable frame 56 then sends the clamped square lithium battery pack to the bottom of the punching cutter 54 for cutting. After that, the two rotary clamping cylinders 57 release the clamp, the movable frame 56 resets, and the clamping and handling fixture 6 removes the square lithium battery pack after the tail is cut.

[0061] See Figure 1 The top of the workbench 1 is equipped with an auxiliary disassembly component 7 and a rotary cutting component 8. The clamping and handling fixture 6 moves the square shell after the tail is cut to the position of the auxiliary disassembly component 7. The auxiliary disassembly component 7 and the rotary cutting component 8 work together to perform a circumferential cutting operation on the head of the square lithium battery pack. The specific structure of the auxiliary disassembly component 7 is as follows:

[0062] See Figure 10 The auxiliary disassembly component 7 includes an adjustment mechanism 71 installed on the top of the workbench 1 and located on one side of the discharge conveying mechanism 3. The adjustment mechanism 71 is used to obtain the square lithium battery pack held by the clamping and handling fixture 6, drive the square lithium battery pack to rotate, and thus facilitate the circumferential cutting of the rotary cutting component 8.

[0063] See Figure 10The adjustment mechanism 71 includes a movable slide rail 711 mounted on the top of the workbench 1, a lifting slide rail 712 slidably connected to the top of the movable slide rail 711, a rotary cylinder 713 slidably connected to one side of the lifting slide rail 712, an adjustment plate 714 mounted on the output end of the rotary cylinder 713, a clamping cylinder 715 mounted on one side of the adjustment plate 714, and a clamping plate 716 mounted on the output end of the clamping cylinder 715. The driving direction of the movable slide rail 711 is the same as the conveying direction of the discharge conveying mechanism 3. The lifting slide rail 712 can be used to drive the rotary cylinder 713 to move and lift. That is, the movable slide rail 711 and the lifting slide rail 712 cooperate to form a two-axis transfer mechanism. The rotary cylinder 713 is used to make the adjustment plate 714, the clamping cylinder 715 and the clamping plate 716 rotate. Since the square lithium battery pack is square, in order to avoid the square lithium battery pack colliding with the top of the discharge conveying mechanism 3 during the rotation, the lifting slide rail 712 is used for adaptive adjustment.

[0064] See Figure 9 and Figure 10 The rotary cutting assembly 8 is installed on the top of the workbench 1 and located at the end of the discharge conveying mechanism 3. The rotary cutting assembly 8 includes a fixed frame 81 installed on the top of the workbench 1 and a displacement cylinder 82 horizontally installed on the top of the fixed frame 81. A rotary cutting frame 83 is installed at the end of the piston rod of the displacement cylinder 82. A rotary cutting motor 84 is installed on one side of the rotary cutting frame 83. A rotary cutting blade 85 is installed at the output end of the rotary cutting motor 84. When the square-shell lithium battery pack is clamped by the adjustment mechanism 71, the clamping and handling fixture 6 moves away and clamps the next square-shell lithium battery pack. At this time, the displacement cylinder 82 pushes the rotary cutting frame 83, the rotary cutting motor 84, and the rotary cutting blade 85 closer to the square shell. At the same time, the rotary cutting motor 84 drives the rotary cutting blade 85 to rotate. When the rotary cutting blade 85 begins to cut the square shell, the rotary cylinder 713 drives the square shell lithium battery pack to rotate. During the rotation of the square shell lithium battery pack, the moving slide rail 711 and the lifting slide rail 712 work together to adaptively adjust the position of the square shell lithium battery pack, thereby maintaining the depth of the rotary cutting component 8 inside the square shell. The circumferential cutting operation is completed after the square shell lithium battery pack has rotated one revolution.

[0065] See Figure 5 The top of the workbench 1 is equipped with a disassembly assembly 9, which is used to further disassemble the prismatic lithium battery pack that has already been cut at the head and tail. The specific structure of the disassembly assembly 9 is as follows:

[0066] See Figures 5-8The disassembly assembly 9 includes an ejection mechanism 91 installed on the top of the workbench 1 and located on both sides of the discharge conveying mechanism 3. The ejection mechanism 91 is set on the same side as the adjustment mechanism 71. The height of the ejection mechanism 91 is higher than the top height of the discharge conveying mechanism 3. The conveying direction of the branch conveying mechanism 4 is set to correspond to the ejection direction of the ejection mechanism 91. Two sets of cells are set inside the square lithium battery pack. Each set of cells is wrapped by a composite material of lithium battery separator and electrode. The ejection mechanism 91 is composed of an ejection cylinder and an ejection plate. The ejection cylinder is used to push the ejection plate to move, causing the ejection plate to penetrate from the tail of the square shell and eject the cells from the square shell. The branch conveying mechanism 4 is set opposite to the ejection mechanism 91. The ejected cells are dragged onto the branch conveying mechanism 4, and the branch conveying mechanism 4 delivers the cells. The empty square shell can be discharged by continuing to be conveyed by the discharge conveying mechanism 3.

[0067] In Example 2, if the battery pack has already experienced an impact or collision before recycling, such as in the usage scenario of new energy vehicles, the collision usually only occurs on the mounting surface of the battery pack facing the ground, which will cause deformation of the square shell, directly affecting the efficiency of the subsequent ejection of the separator and electrode. During the cutting process of the square shell, sharp metal protrusions are easily generated at the cut, which will become obstacles during disassembly. When the separator and electrode are ejected, they will be squeezed against the already deformed and collapsed opening of the square shell. At this time, the burrs are very likely to tear and damage the separator and electrode. Later, the separator and electrode need to be completely recycled by unwinding. Damage will directly reduce the smoothness of the recycling process.

[0068] For this purpose, please refer to Figure 4 A test camera 69 for testing defects in the square shell is installed below the support plate 65 to first identify the location of the possible deformation surface of the square shell lithium battery pack. After the tail of the square shell lithium battery pack is cut, it is continued to be transported to the adjustment mechanism 71 by the clamping and transporting fixture 6. In this state, the test camera 69 can test the defects of the square shell. If the defect of the square shell lithium battery pack is at the top and is detected, the square shell lithium battery pack is held in this state by the adjustment mechanism 71 and then cut by the rotary cutting assembly 8.

[0069] If the top defect of the square lithium battery pack is not detected, the defect may exist at the bottom of the square shell or there may be no defect. Then, the rotary cylinder 713 drives the adjustment plate 714, clamping cylinder 715, clamping plate 716 and the square lithium battery pack to rotate 180 degrees, and then the cutting operation is performed by the rotary cutting assembly 8.

[0070] The splitting assembly 9 also includes a separation mechanism 92 installed on the top of the workbench 1. One end of the branch conveying mechanism 4 extends to one side of the separation mechanism 92. The separation mechanism 92 includes a base frame 921 installed on the top of the workbench 1. A U-shaped frame 922 is installed on the top of the base frame 921. An extension plate 926 is installed on the top of the U-shaped frame 922. The extension plate 926 extends above the discharge conveying mechanism 3. A pressing cylinder 927 is installed on the top of the extension plate 926. The piston rod end of the pressing cylinder 927 passes through the top of the extension plate 926 and is connected to a positioning plate. The positioning plate is L-shaped.

[0071] Specifically, after the square shell passes inspection and all external defects or dents are kept in the upper position, after the square shell is circumferentially cut, the positioning mechanism 71 places the square shell lithium battery pack downwards on the top of the discharge conveying mechanism 3 for conveying. The discharge conveying mechanism 3 conveys the square shell lithium battery pack forward to the position of the disassembly component 9. The height of the ejection mechanism 91 is adapted to the height of the lower cell. The pressing cylinder 927 pushes the positioning plate down to position the square shell lithium battery pack. The positioning plate is stuck in the upper position of the tail opening of the square shell lithium battery pack.

[0072] Subsequently, the ejection mechanism 91 extends into the square shell to eject the lower battery cell. During this process, the separation frame 925 blocks the upper battery cell to prevent the upper battery cell from moving synchronously with the ejection mechanism 91 and the lower battery cell, which would cause the battery cell, lithium battery separator and electrode to be forcibly squeezed, and reduce the scratches caused by the sharp spikes blocking the opening at the head of the square shell.

[0073] After the lower cell is pushed out, the pushing mechanism 91 retracts in the reverse direction. At this time, the positioning plate continues to block the upper cell in the reverse direction to prevent the upper cell from moving synchronously with the pushing mechanism 91, which would cause the cell, lithium battery separator and electrode to be forcibly squeezed, and reduce the scratches caused by the sharp barbs blocking the opening at the tail of the square shell.

[0074] After the ejection mechanism 91 retracts, the upper battery cell falls to the position of the original lower battery cell. Then, the ejection mechanism 91 continues to extend to eject the battery cell from the square shell.

[0075] If a prismatic lithium battery pack is subjected to a severe impact, causing a slight leakage of the electrolyte inside, the lithium battery separator and electrode sheets wrapped around the two cells may become slightly stuck together, making it difficult to separate them.

[0076] For this purpose, please refer to Figures 5-8 A push cylinder 923 is installed on the top of the U-shaped frame 922. The push cylinder 923 is positioned towards the ejection mechanism 91. A connecting plate 924 is connected to the piston rod end of the push cylinder 923. A separation frame 925 is installed on the side wall of the connecting plate 924. A separation strip 928 is connected to the bottom of the separation frame 925 and to the side facing the ejection mechanism 91.

[0077] When the cells inside the square lithium battery pack need to be ejected, the square shell is first positioned using a positioning plate. Then, the cylinder 923 pushes the connecting plate 924 and the separating frame 925 to move towards the head of the square battery pack, causing the separating strip 928 to adhere to the opening at the head of the square shell. The separating strip 928 is located between the two layers of cells inside the square battery pack. When the lower layer of cells is ejected, the separating strip 928 helps to scrape and cut the lower layer of cells during the separation process, preventing the two layers from tearing each other and making separation difficult when they are about to be completely separated.

[0078] In Example 3, during the ring cutting process, because the rotary cutter 85 penetrates a large depth into the square shell and the rotary cutter 85 is always rotating, the cutting material at the head of the square shell will cause vibration, which will affect the cutting situation. The vibration of the cutting material will cause unstable contact between the rotary cutter 85 and the edge of the square shell cut, resulting in a large number of irregular chipping edges. The height of the chipping spikes is much higher than that of normal cutting, which will greatly affect the integrity of the cell when it is pushed out.

[0079] For this purpose, please refer to Figure 10 The auxiliary disassembly assembly 7 also includes an auxiliary mechanism 72 installed on the top of the workbench 1 and located on one side of the discharge conveying mechanism 3. The separation mechanism 92 is set on the same side as the auxiliary mechanism 72. The auxiliary mechanism 72 is used to assist in positioning the head of the square lithium battery pack, thereby reducing shaking when the head of the square lithium battery pack is cut. The specific structure of the auxiliary mechanism 72 is as follows:

[0080] See Figure 10 The auxiliary mechanism 72 includes a vertical plate 721 mounted on the top of the workbench 1. The vertical plate 721 is arranged opposite to the adjustment mechanism 71. One side of the discharge conveying mechanism 3 extends between the adjustment mechanism 71 and the auxiliary mechanism 72. A swing plate 723 is hinged to the top of the vertical plate 721. An auxiliary cylinder 722 is vertically mounted on the side of the vertical plate 721 away from the discharge conveying mechanism 3. The piston rod end of the auxiliary cylinder 722 is hinged to one side of the swing plate 723. A swing seat 724 is mounted on one side of the swing plate 723. A housing 725 is rotatably connected to one side of the swing seat 724 via a damping shaft.

[0081] After the tail of the prismatic lithium battery pack is cut, the clamping and transporting fixture 6 picks up the cut prismatic lithium battery pack and moves it to the position of the adjusting mechanism 71 and the auxiliary mechanism 72. Then, the head of the prismatic lithium battery pack is inserted into the shell 725. The clamping cylinder 715 drives the two clamping plates 716 to move closer together to clamp the prismatic lithium battery pack. Afterwards, the clamping and transporting fixture 6 moves away. When the rotary cutting assembly 8 begins to cut the prismatic shell, the adjusting mechanism 71 drives the prismatic lithium battery pack to rotate. During the rotation of the prismatic lithium battery pack, the adjusting mechanism... 71 drives the square lithium battery pack to adaptively adjust its position, thereby maintaining the depth of the rotary cutting component 8 inside the square shell. After the square lithium battery pack rotates one revolution, the ring cutting operation is completed. After the ring cutting is completed, the positioning mechanism 71 places the square lithium battery pack downwards on the top of the discharge conveying mechanism 3 for conveying. Meanwhile, the auxiliary cylinder 722 extends, causing the swing plate 723, the swing seat 724 and the shell 725 to swing. The shell 725 tilts upwards towards the discharge conveying mechanism 3, causing the cut head of the square lithium battery pack to fall onto the top of the discharge conveying mechanism 3.

[0082] Specifically, the auxiliary mechanism 72 assists in positioning the head of the lithium battery pack, and works in conjunction with the clamping and position adaptation of the adjustment mechanism 71 to effectively reduce shaking during cutting, avoid irregular edge breakage and excessively high spikes, ensure the integrity of the battery cell ejection, and achieve automatic removal of head residue, thereby improving cutting quality and operational continuity.

[0083] Example 4: A lithium battery recycling process using the lithium battery recycling apparatus described above, comprising the following steps:

[0084] S1. Place the square lithium battery pack to be disassembled on top of the feeding and conveying mechanism 2, with the electrodes placed on the same side. When the feeding and conveying mechanism 2 transports the square lithium battery pack to the bottom of the clamping and handling fixture 6, the clamping and handling fixture 6 clamps the square lithium battery pack and places it on top of the square punching assembly 5 for tail cutting.

[0085] The more specific steps in S1 are as follows:

[0086] S11. Place the prismatic lithium battery pack to be disassembled on top of the feeding and conveying mechanism 2, with the electrodes placed on the same side. When the feeding and conveying mechanism 2 transports the prismatic lithium battery pack to the bottom of the clamping and handling fixture 6, the first electric slide rail 62 drives the slide block 63, support plate 65, second electric slide rail 66, dual-axis cylinder 67 and clamping arm 68 to move synchronously towards the feeding and conveying mechanism 2. Then, the second electric slide rail 66 drives the dual-axis cylinder 67 and clamping arm 68 to move above the feeding and conveying mechanism 2. After that, the lifting cylinder 64 drives the support plate 65, second electric slide rail 66, dual-axis cylinder 67 and clamping arm 68 to move down as a whole, causing the two clamping arms 68 to move to the side wall position of the prismatic lithium battery pack. The dual-axis cylinder 67 drives the two clamping arms 68 to move closer to each other to clamp the prismatic lithium battery pack. Then, through the cooperation of the second electric slide rail 66 and the lifting cylinder 64, the prismatic lithium battery pack is lifted and placed on top of the moving frame 56.

[0087] S12. Then, the two rotary pressing cylinders 57 work together to rotate and press down, thereby pressing the square lithium battery pack on top of the moving frame 56. Then, the moving frame 56 moves the square lithium battery pack to below the punching blade 54. The punching cylinder 52 pushes the blade holder 53 and the punching blade 54 down, and the punching blade 54 cuts the tail of the square lithium battery pack, causing an opening to appear at the tail of the square lithium battery pack.

[0088] S2. After the tail of the prismatic lithium battery pack is cut, the clamping and transporting fixture 6 picks up the tail-cut prismatic lithium battery pack and moves it to the position of the adjusting mechanism 71 and the auxiliary mechanism 72. At the same time, the clamping and transporting fixture 6 detects defects on the surface of the prismatic lithium battery pack. When the prismatic lithium battery pack reaches the position of the adjusting mechanism 71 and the auxiliary mechanism 72, the head of the prismatic lithium battery pack is inserted into the auxiliary mechanism 72, and the adjusting mechanism 71 clamps the prismatic lithium battery pack. Then the clamping and transporting fixture 6 moves away. If the clamping and transporting fixture 6 detects a defect, the prismatic lithium battery pack remains stationary. If the clamping and transporting fixture 6 does not detect a defect, the adjusting mechanism 71 rotates the prismatic battery pack 180 degrees and keeps it stationary in preparation for circumferential cutting.

[0089] The more specific steps of S2 are as follows:

[0090] S21. After the tail of the square lithium battery pack is cut, the clamping and handling fixture 6 picks up the tail-cut square lithium battery pack and moves it to the position of the adjustment mechanism 71 and the auxiliary mechanism 72. At the same time, the test camera 69 detects the defects on the surface of the square lithium battery pack. Then, the head of the square lithium battery pack is inserted into the inside of the shell 725. The clamping cylinder 715 drives the two clamping plates 716 to move closer to each other to clamp the square lithium battery pack. Then, the clamping and handling fixture 6 is moved away.

[0091] S22. If the defect of the prismatic lithium battery pack is at the top and is detected, the prismatic lithium battery pack is ready for circumferential cutting.

[0092] S23. If the defect in the square lithium battery pack is not detected, the defect exists at the bottom of the square shell. Then, the rotating cylinder 713 drives the adjusting plate 714, the clamping cylinder 715, the clamping plate 716 and the square lithium battery pack to rotate 180 degrees, and prepares for the ring cutting operation.

[0093] S3. The rotary cutting assembly 8 starts and moves towards the square lithium battery pack. When the rotary cutting assembly 8 starts cutting the square shell, the positioning mechanism 71 drives the square lithium battery pack to rotate. During the rotation, the positioning mechanism 71 drives the square lithium battery pack to adaptively adjust its position, thereby maintaining the depth of the rotary cutting assembly 8 inside the square shell. The circumferential cutting operation is completed after the square lithium battery pack has rotated one revolution.

[0094] The more specific steps for S3 are as follows:

[0095] S31, the displacement cylinder 82 pushes the rotary cutting frame 83, the rotary cutting motor 84 and the rotary cutting blade 85 closer to the square shell. At the same time, the rotary cutting motor 84 drives the rotary cutting blade 85 to rotate. When the rotary cutting blade 85 starts cutting the square shell, the rotary cylinder 713 drives the square shell lithium battery pack to rotate. During the rotation of the square shell lithium battery pack, the moving slide rail 711 and the lifting slide rail 712 cooperate to drive the square shell lithium battery pack to adaptively adjust its position, thereby maintaining the depth of the rotary cutting component 8 inside the square shell. The circumferential cutting operation is completed after the square shell lithium battery pack rotates one revolution.

[0096] S4. After the ring cutting is completed, the positioning mechanism 71 places the square lithium battery pack downwards on the top of the discharge conveying mechanism 3 for conveying. The auxiliary mechanism 72 places the cut head residue of the square lithium battery pack on the top of the discharge conveying mechanism 3. The discharge conveying mechanism 3 conveys the square lithium battery pack forward to the position of the splitting component 9. The separation mechanism 92 positions the conveyed square lithium battery pack. The ejection mechanism 91 ejects the two layers of cells inside the square lithium battery pack from bottom to top to the position of the branch conveying mechanism 4 for discharge. The remaining square cells can continue to be conveyed forward through the discharge conveying mechanism 3.

[0097] The more specific steps for S4 are as follows:

[0098] S41. After the ring cutting is completed, the positioning mechanism 71 places the square lithium battery pack downwards on the top of the discharge conveying mechanism 3 for conveying. The auxiliary cylinder 722 extends, causing the swing plate 723, the swing seat 724 and the shell 725 to swing. The shell 725 tilts upwards towards the discharge conveying mechanism 3, causing the cut square lithium battery pack head to fall onto the top of the discharge conveying mechanism 3.

[0099] S42, the discharge conveying mechanism 3 conveys the square lithium battery pack forward to the position of the disassembly component 9. The pressing cylinder 927 pushes the positioning plate to move down and position the square lithium battery pack. The positioning plate is stuck in the upper layer of the tail opening of the square lithium battery pack. Then the pushing cylinder 923 pushes the connecting plate 924 and the separating frame 925 to move towards the head position of the square battery pack, so that the separating strip 928 is attached to the head opening of the square battery pack and the separating strip 928 is located between the two layers of cells inside the square battery pack.

[0100] S43. The height of the ejection mechanism 91 is adapted to the height of the lower battery cell. The ejection mechanism 91 ejects the lower battery cell inside the lithium battery pack to the position of the branch conveying mechanism 4 for discharge. During this process, the separation frame 925 blocks the upper battery cell, and the separation strip 928 separates the adhesion between the two battery cells.

[0101] S44. After that, the ejection mechanism 91 retracts. At this time, the positioning plate blocks the upper battery cell. After the ejection mechanism 91 retracts from the inside of the square shell, the upper battery cell falls to the lower battery cell. Then, it is ejected again by the ejection mechanism 91, and the remaining square shell can continue to be conveyed forward by the discharge conveying mechanism 3.

[0102] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A lithium battery recycling processing device, characterized by: It comprises a workbench (1); A discharging conveying mechanism (3) is used for conveying the disassembled square shell; A square shell punching assembly (5) is used for punching the tail of the square shell; The clamping and carrying tool (6) comprises a stand (61) installed on the top of the workbench (1), a first electric sliding rail (62) installed on one side of the stand (61), a sliding seat (63) sliding on one side of the first electric sliding rail (62), a supporting plate (65) sliding on the side wall of the sliding seat (63), and a double-shaft air cylinder (67) sliding below the supporting plate (65), the piston rod end of the double-shaft air cylinder (67) is connected with a clamping arm (68), and the lower portion of the supporting plate (65) is provided with a test camera (69) for testing defects of the square shell; An auxiliary disassembly assembly (7) comprises a positioning mechanism (71) and an auxiliary mechanism (72) installed on the top of the workbench (1) and located on both sides of the discharging conveying mechanism (3); The positioning mechanism (71) comprises a moving sliding rail (711) installed on the top of the workbench (1), a lifting sliding rail (712) slidingly connected to the top of the moving sliding rail (711), a rotating air cylinder (713) slidingly connected to one side of the lifting sliding rail (712), a positioning plate (714) installed on the output end of the rotating air cylinder (713), a clamping air cylinder (715) installed on one side of the positioning plate (714), and a clamping plate (716) installed on the output end of the clamping air cylinder (715); the driving direction of the moving sliding rail (711) is the same as the conveying direction of the discharging conveying mechanism (3), and the lifting sliding rail (712) can be used to drive the rotating air cylinder (713) to move up and down; The auxiliary mechanism (72) comprises a vertical plate (721) installed on the top of the workbench (1), the vertical plate (721) is arranged opposite to the positioning mechanism (71), one side of the discharging conveying mechanism (3) extends between the positioning mechanism (71) and the auxiliary mechanism (72), the top of the vertical plate (721) is hingedly connected with a swing plate (723), the side, away from the discharging conveying mechanism (3), of the vertical plate (721) is vertically upwardly provided with an auxiliary air cylinder (722), the piston rod end of the auxiliary air cylinder (722) is hingedly connected with one side of the swing plate (723), one side of the swing plate (723) is provided with a swing seat (724), and one side of the swing seat (724) is rotatably connected with a shell (725) through a damping rotating shaft; A rotary cutting assembly (8) is used for rotary cutting of the head of the square shell; A disassembly assembly (9) comprises a pushing-out mechanism (91) and a separation mechanism (92) installed on the top of the workbench (1), and the pushing-out mechanism (91) and the separation mechanism (92) are arranged opposite to each other; The positioning mechanism (71) is used for obtaining the square shell lithium battery pack clamped by the clamping and carrying tool (6), driving the square shell lithium battery pack to rotate, and facilitating the surrounding cutting of the rotary cutting assembly (8), and the auxiliary mechanism (72) is used for auxiliary positioning of the head of the square shell lithium battery pack; When the square lithium battery pack reaches the position of the positioning mechanism (71) and the auxiliary mechanism (72), the head of the square lithium battery pack is inserted into the auxiliary mechanism (72), and the square lithium battery pack is clamped by the positioning mechanism (71), then the clamping and carrying tool (6) is removed, if the defect of the square lithium battery pack is on the top and is detected, the square lithium battery pack remains in this state and is clamped by the positioning mechanism (71), then cutting operation is performed by the rotary cutting assembly (8); If the top defect of the square lithium battery pack is not detected, the defect may exist in the bottom of the square lithium battery pack or there is no defect, then the rotating cylinder (713) drives the positioning plate (714), the clamping cylinder (715), the clamping plate (716) and the square lithium battery pack to rotate 180 degrees, then cutting operation is performed by the rotary cutting assembly (8), and the cut square lithium battery pack is conveyed to the position of the separating assembly (9) by the discharging conveying mechanism (3), the square lithium battery pack is positioned by the separating mechanism (92), and the two layers of battery cells in the square lithium battery pack are pushed out from bottom to top by the pushing-out mechanism (91).

2. The lithium battery recycling device of claim 1, wherein: The top of the workbench (1) is provided with a feeding conveying mechanism (2), one end of the feeding conveying mechanism (2) extends to one side of the square shell punching assembly (5), one side of the workbench (1) is provided with a branch conveying mechanism (4), the feeding conveying mechanism (2) and the branch conveying mechanism (4) are relatively staggered, one end of the branch conveying mechanism (4) extends to one side of the separating mechanism (92), and the conveying direction of the branch conveying mechanism (4) corresponds to the pushing direction of the pushing-out mechanism (91).

3. The lithium battery recycling device of claim 1, wherein: The square shell punching assembly (5) comprises a punching frame (51) mounted on the top of the workbench (1), a punching cylinder (52) mounted on the top of the punching frame (51), a knife seat (53) connected to the bottom end of the piston rod of the punching cylinder (52), and a punching knife (54) mounted on the bottom of the knife seat (53). The top of the workbench (1) is provided with a guide rail (55), the top of the guide rail (55) is slidably connected with a moving frame (56), the moving frame (56) is arranged opposite to one end of the feeding conveying mechanism (2), and the top of the moving frame (56) is symmetrically provided with two rotary pressing cylinders (57) arranged along the conveying direction of the feeding conveying mechanism (2).

4. The lithium battery recycling device of claim 1, wherein: The clamping and carrying tool (6) further comprises a lifting cylinder (64) mounted on the top of the sliding seat (63), the piston rod of the lifting cylinder (64) is connected with a supporting plate (65), the bottom of the supporting plate (65) is provided with a second electric sliding rail (66), and the double-shaft cylinder (67) slides on the bottom of the second electric sliding rail (66).

5. The lithium battery recycling device of claim 1, wherein: The rotary cutting assembly (8) is installed on the top of the workbench (1) and located at the end of the discharging conveying mechanism (3), the rotary cutting assembly (8) comprises a fixing frame (81) installed on the top of the workbench (1) and a displacement air cylinder (82) horizontally installed on the top of the fixing frame (81), the piston rod end of the displacement air cylinder (82) is provided with a rotary cutting frame (83), one side of the rotary cutting frame (83) is provided with a rotary cutting motor (84), and the output end of the rotary cutting motor (84) is provided with a rotary cutting piece (85).

6. The lithium battery recycling device of claim 1, wherein: The push-out mechanism (91) and the separation mechanism (92) are located on both sides of the discharging conveying mechanism (3), the height of the push-out mechanism (91) is higher than the top height of the discharging conveying mechanism (3), the push-out mechanism (91) is arranged on the same side of the position adjusting mechanism (71), and the separation mechanism (92) is arranged on the same side of the auxiliary mechanism (72); The separation mechanism (92) comprises a base frame (921) installed on the top of the workbench (1), a U-shaped frame (922) installed on the top of the base frame (921), an extension plate (926) installed on the top of the U-shaped frame (922), wherein the extension plate (926) extends above the discharging conveying mechanism (3), a pressing-down air cylinder (927) installed on the top of the extension plate (926), and the piston rod end of the pressing-down air cylinder (927) penetrates through the top of the extension plate (926) and is connected with a positioning plate.

7. The lithium battery recycling device of claim 6, wherein: A pushing air cylinder (923) is installed on the top of the U-shaped frame (922) and faces the push-out mechanism (91), the piston rod end of the pushing air cylinder (923) is connected with a connecting plate (924), a separation frame (925) is installed on the side wall of the connecting plate (924), and a separation strip (928) is connected to one side of the separation frame (925) and faces the push-out mechanism (91).

8. A lithium battery recycling process using a lithium battery recycling device according to any one of claims 1-7, characterized in that, The method comprises the following steps: S1, placing the square shell lithium battery pack to be disassembled on the top of the feeding conveying mechanism (2), and placing the electrodes on the same side, when the feeding conveying mechanism (2) conveys the square shell lithium battery pack below the clamping and carrying tool (6), the clamping and carrying tool (6) clamps and places the square shell lithium battery pack on the top of the square shell cutting assembly (5) for tail cutting; S2, after the tail cutting of the square shell lithium battery pack is completed, the clamping and carrying tool (6) grabs and moves the tail-cut square shell lithium battery pack to the position of the position adjusting mechanism (71) and the auxiliary mechanism (72), at the same time, the clamping and carrying tool (6) detects the defects on the surface of the square shell lithium battery pack; when the square shell lithium battery pack reaches the position of the position adjusting mechanism (71) and the auxiliary mechanism (72), the head of the square shell lithium battery pack is inserted into the auxiliary mechanism (72), and the position adjusting mechanism (71) is used for clamping the square shell lithium battery pack, then the clamping and carrying tool (6) moves away, if the clamping and carrying tool (6) detects defects, the square shell lithium battery pack remains stationary; if the clamping and carrying tool (6) does not detect defects, the position adjusting mechanism (71) drives the square shell battery pack to rotate 180 degrees and remains stationary for ring cutting; The more specific steps of S2 are: S21, after the tail cutting of the square shell lithium battery pack is completed, the clamping and carrying tool (6) grabs and moves the tail-cut square shell lithium battery pack to the position of the positioning mechanism (71) and the auxiliary mechanism (72), at the same time, the test camera (69) detects the defects on the surface of the square shell lithium battery pack, then the head of the square shell lithium battery pack is inserted into the inside of the shell sleeve (725), the clamping cylinder (715) drives the two clamping plates (716) to approach each other to clamp the square shell lithium battery pack, and then the clamping and carrying tool (6) moves away; S22, if the defect of the square shell lithium battery pack is on the top and is detected, the square shell lithium battery pack is ready for ring cutting operation; S23, if the defect of the square shell lithium battery pack is not detected, the defect exists in the bottom of the square shell, then the rotating cylinder (713) drives the positioning plate (714), the clamping cylinder (715), the clamping plate (716) and the square shell lithium battery pack to rotate 180 degrees, and prepares for ring cutting operation; S3, the rotary cutting assembly (8) starts and approaches the direction of the square shell lithium battery pack, when the rotary cutting assembly (8) starts to cut the square shell, the positioning mechanism (71) drives the square shell lithium battery pack to rotate, and in the rotating process, the positioning mechanism (71) drives the square shell lithium battery pack to adaptively adjust the position, thereby maintaining the depth of the rotary cutting assembly (8) into the inside of the square shell, when the square shell lithium battery pack rotates one round, the ring cutting operation is completed; S4, after the ring cutting is completed, the positioning mechanism (71) places the square shell lithium battery pack downward on the top of the discharging conveying mechanism (3), while the auxiliary mechanism (72) places the head residual of the cut square shell lithium battery pack on the top of the discharging conveying mechanism (3), the discharging conveying mechanism (3) conveys the square shell lithium battery pack forward to the position of the splitting assembly (9), uses the separation mechanism (92) to position the conveyed square shell lithium battery pack, and uses the pushing-out mechanism (91) to push out the two layers of battery cells in the square shell lithium battery pack from bottom to top in turn to the position of the branch conveying mechanism (4) to discharge, and the remaining square shell can be conveyed forward through the discharging conveying mechanism (3).

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