Battery cell electromagnetic hot press molding equipment

Abstract

The utility model discloses battery cell electromagnetic hot press molding equipment. The battery cell electromagnetic hot press molding equipment comprises an automatic feeding and discharging module, a code scanning module, a battery cell electromagnetic hot press test module, an NG cache module, an electrical control module and a rack outer cover module, according to the battery cell electromagnetic hot-press molding equipment, the battery cell electromagnetic hot-press molding technology is adopted, so that the battery cell electromagnetic hot-press molding equipment is of great significance in improving the stability of a lithium battery and promoting the progress of the energy storage and power battery industry; according to the utility model, when the lithium battery cell is clamped and transferred, the lithium battery cell can be accurately clamped, and when the lithium battery cell is placed, the placement position deviation caused by the influence of the supporting hook is avoided, so that the lithium battery cell can be accurately placed in an effective hot-pressing area on a hot-pressing plate, the temperature control error is reduced, and the yield of hot-pressing molding is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of liquid injection production technology for square-shell lithium batteries, specifically relating to an electromagnetic hot pressing molding equipment for battery cells. Background Technology

[0002] Hot pressing of battery cells is one of the most critical processes in the lithium-ion battery cell manufacturing industry. Its effectiveness directly affects electrolyte absorption efficiency, cell thickness, safety performance, and lifespan. The most critical process parameters affecting the cell via hot pressing equipment are hot pressing pressure, time, and temperature, with the accuracy of the hot pressing temperature having the greatest impact on cell performance. Traditional resistance hot pressing plates suffer from drawbacks such as low heating efficiency and large temperature control errors, and can no longer meet the high-performance requirements of the rapidly developing lithium-ion battery industry. Utility Model Content

[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide an electromagnetic hot pressing molding equipment for battery cells.

[0004] The technical solution adopted in this utility model is as follows:

[0005] An electromagnetic hot pressing molding equipment for battery cells includes an automatic loading and unloading module, a barcode scanning module, an electromagnetic hot pressing testing module for battery cells, an NG buffer module, an electrical control module, and a frame cover module.

[0006] The automatic loading and unloading module includes a second conveyor belt, a support plate located on one side of the second conveyor belt, and multiple clamping units detachably mounted on the support plate.

[0007] The clamping unit includes a clamping assembly and a calibration assembly mounted on the clamping assembly; the clamping unit is used to clamp the battery cell;

[0008] The calibration assembly includes a mounting box, a fixed rail fixedly connected to the mounting box, a control gear rotatably disposed inside the mounting box, two racks slidably connected to the fixed rail and meshing with the control gear, telescopic rods hinged to the ends of the two racks respectively away from each other, rotating sleeves slidably connected to the two telescopic rods respectively, mounting rods fixedly connected to the ends of the two rotating sleeves respectively away from the telescopic rods, and calibration rods respectively mounted on the two synchronous belts.

[0009] As a preferred embodiment of this invention, the clamping assembly includes a jaw, two clamping cylinders fixedly connected to two piston rods controlled on both sides of the jaw, and multiple hooks mounted on the clamping cylinders; the two rotating sleeves are rotatably connected to the two clamping cylinders via torsion springs. The hooks are L-shaped, and the hooks on the two jaws are symmetrical to each other. A baffle is fixedly provided at the end of the jaw away from the clamping cylinder.

[0010] As a preferred embodiment of this utility model, the two sides of the gripper are fixedly mounted on the connecting block, one side of the mounting box is fixedly connected to the connecting block, a rotating disk is fixedly mounted on the side of the connecting block away from the clamping cylinder, a rotating shaft is fixedly mounted on the end of the rotating disk away from the connecting block, the rotating shaft passes through and is rotatably connected to the bearing plate, and a control pulley is fixedly mounted on the end of the rotating shaft away from the rotating disk.

[0011] As a preferred embodiment of this utility model, the automatic loading and unloading module further includes a movable plate, a fixed cover fixedly connected to the movable plate, and a sliding rod slidably connected to the fixed cover and controlled by a cylinder; the movable plate is connected to the outer cover module of the frame via a cylinder, and the bearing plate is rotatably connected to the sliding rod.

[0012] As a preferred embodiment of this invention, a control motor and a drive motor are respectively installed at the two ends of the sliding rod away from the support plate. A control shaft is provided between the drive motor and the control motor, the control shaft passes through and is rotatably connected to the sliding rod, and the control shaft is fixedly connected to the support plate. A drive pulley is fixedly provided on the output shaft of the control motor, and a driven pulley is provided on one side of the drive pulley. The driven pulley is fixedly connected to the control shaft, and the driven pulley and the drive pulley are driven by a synchronous belt.

[0013] As a preferred embodiment of this utility model, a control sleeve is provided around the control shaft. The inner and outer sides of the control sleeve are rotatably connected to the control shaft and the sliding rod, respectively. An installation space is provided in the sliding rod. One end of the control sleeve passing through the sliding rod is located in the installation space. A rotating pulley is provided in the installation space. The rotating pulley is fixedly connected to the control sleeve. The rotating pulley and multiple control pulleys are driven by a synchronous belt. A drive pulley is fixedly provided on the control sleeve. A transmission pulley is fixedly provided on the output shaft of the drive motor. The transmission pulley and the drive pulley are driven by a synchronous belt.

[0014] As a preferred embodiment of this utility model, the barcode scanning module includes a fixed frame and a barcode scanner detachably mounted on the fixed frame. The barcode scanner is used to obtain the status of the battery cells conveyed on the second conveyor belt.

[0015] As a preferred embodiment of this utility model, the cell electromagnetic hot-pressing test module includes a movable plate, a lifting cylinder disposed on one side of the movable plate and connected to the frame outer cover module, multiple guide rods, a hot-pressing plate slidably connected to the guide rods, and a rope assembly installed on one side of the movable plate and connected to the hot-pressing plate; an mounting plate is fixedly provided at the end of the guide rod away from the movable plate, and a drive cylinder connected to the frame outer cover module is mounted on the mounting plate, and the piston rod of the drive cylinder is connected to the uppermost hot-pressing plate.

[0016] As a preferred embodiment of this utility model, the NG buffer module includes a slide rail connected to the frame cover module, a load-bearing beam slidably connected to the slide rail via a linear motor, a sliding seat slidably connected to the load-bearing beam via a linear motor, a clamping assembly mounted on the sliding seat, and a conveyor belt disposed on one side of the load-bearing beam.

[0017] The beneficial effects of this utility model are as follows: As a battery cell electromagnetic hot pressing molding equipment, this utility model adopts battery cell electromagnetic hot pressing molding technology, which is of great significance for improving the stability of lithium batteries and promoting the progress of the energy storage and power battery industries; when clamping and transferring lithium battery cells, this utility model can clamp them accurately, and when placing the cells, the placement position will not be deviated due to the influence of the hook, so that they can be accurately placed in the effective hot pressing area of ​​the hot pressing plate, reducing temperature control errors and ensuring the yield of hot pressing molding. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a utility model Figure 1 A schematic diagram of the rear structure;

[0021] Figure 3 This is a utility model Figure 1 A schematic diagram of the NG cache module structure;

[0022] Figure 4 This is a utility model Figure 1 A schematic diagram of the QR code scanning structure;

[0023] Figure 5 This is a utility model Figure 1 A schematic diagram of the automatic loading and unloading module structure;

[0024] Figure 6 This is a utility model Figure 5 A schematic diagram of the clamping unit structure;

[0025] Figure 7 This is a utility model Figure 5 A schematic diagram of the rear structure;

[0026] Figure 8 This is a utility model Figure 7 A magnified structural diagram at point A. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0029] The following is combined Figure 1-8 This invention describes a specific embodiment of a battery cell electromagnetic hot pressing molding equipment, comprising an automatic loading and unloading module 11, a barcode scanning module 12, a battery cell electromagnetic hot pressing testing module 13, an NG buffer module 14, an electrical control module, and a frame cover module.

[0030] The automatic loading and unloading module 11 includes a second conveyor belt 18, a support plate 35 located on one side of the second conveyor belt 18, and multiple clamping units detachably installed on the support plate 35.

[0031] The clamping unit includes a clamping assembly and a calibration assembly mounted on the clamping assembly; the clamping unit is used to clamp the battery cell 31.

[0032] The calibration assembly includes a mounting box 39, a fixed rail 38 fixedly connected to the mounting box 39, a control gear rotatably disposed inside the mounting box 39, two racks 43 slidably connected to the fixed rail 38 and meshing with the control gear, telescopic rods 44 hinged to the ends of the two racks 43 respectively away from each other, rotating sleeves 45 slidably connected to the two telescopic rods 44 respectively, mounting rods 59 fixedly connected to the ends of the two rotating sleeves 45 respectively away from the telescopic rods 44, and calibration rods 46 respectively mounted on the two mounting rods 59. The hot-pressing test module 13 consists of four vertically distributed electromagnetic hot-pressing plates 23. Four battery cells can be simultaneously hot-pressed by a cylinder. The upper plate is equipped with a Hi-pot test probe to synchronously measure whether the resistance between the anode and cathode ears is qualified under hot-pressing conditions. After the battery cells are hot-pressed and formed, they are passed through the automatic loading and unloading module 11 in the same manner. Unqualified battery cells are rejected by the NG buffer module 14, and qualified battery cells enter the next process.

[0033] Advantageously, the clamping assembly includes a jaw 30, two clamping cylinders 28 fixedly connected to two piston rods controlled on both sides of the jaw 30, and a plurality of hooks 37 mounted on the clamping cylinders 28; the two rotating sleeves 45 are rotatably connected to the two clamping cylinders 28 respectively via torsion springs. The hooks are L-shaped, and the hooks on the two jaws are symmetrical to each other. A baffle is fixedly provided at the end of the jaw away from the clamping cylinder. The hooks 37 can carry the battery cell 31, and the torsion springs tend to keep the two calibration rods 46 close to the battery cell 31 at all times.

[0034] Advantageously, the two sides of the gripper 30 are fixedly mounted on the connecting block 40, one side of the mounting box 39 is fixedly connected to the connecting block 40, a rotating disk 34 is fixedly mounted on the side of the connecting block 40 away from the clamping cylinder 28, a rotating shaft 41 is fixedly mounted on the end of the rotating disk 34 away from the connecting block 40, the rotating shaft 41 passes through and is rotatably connected to the bearing plate 35, and a control pulley 42 is fixedly mounted on the end of the rotating shaft 41 away from the rotating disk 34. The posture of the clamping unit is adjusted by the rotating disk 34 to ensure that the battery cell 31 always remains horizontal and upward.

[0035] Advantageously, the automatic loading and unloading module 11 further includes a movable plate 19, a fixed cover 20 fixedly connected to the movable plate 19, and a sliding plate 36 slidably connected to the fixed cover 20 and controlled by a cylinder; the movable plate 19 is connected to the frame outer cover module via a cylinder, and the bearing plate 35 is rotatably connected to the sliding plate 36. The automatic loading and unloading module 11 moves in both the horizontal and vertical directions via the cylinder.

[0036] Advantageously, a control motor 52 and a drive motor 49 are respectively installed at both ends of the sliding plate 36 away from the support plate 35. A control shaft 56 is provided between the drive motor 49 and the control motor 52. The control shaft 56 passes through and is rotatably connected to the sliding plate 36. The control shaft 56 is fixedly connected to the support plate 35. A drive pulley 54 is fixedly provided on the output shaft of the control motor 52. A driven pulley 51 is provided on one side of the drive pulley 54. The driven pulley 51 is fixedly connected to the control shaft 56. The driven pulley 51 and the drive pulley 54 are driven by a synchronous belt 55.

[0037] Advantageously, a control sleeve 62 is provided around the control shaft 56. The inner and outer sides of the control sleeve 62 are rotatably connected to the control shaft 56 and the sliding plate 36, respectively. An installation space 61 is provided in the sliding plate 36. One end of the control sleeve 62, passing through the sliding plate 36, is located within the installation space 61. A rotating pulley is provided within the installation space 61. The rotating pulley is fixedly connected to the control sleeve 62. The rotating pulley and multiple control pulleys 42 are driven by a synchronous belt 47. A drive pulley 60 is fixedly provided on the control sleeve 62. A transmission pulley 48 is fixedly provided on the output shaft of the drive motor 49. The transmission pulley 48 and the drive pulley 60 are driven by a synchronous belt 50. The control motor 52 and the drive motor 49 cooperate to control the adjustment of the posture of multiple battery cells 31.

[0038] Advantageously, the barcode scanning module 12 includes a mounting frame 32 and a barcode scanner 33 detachably mounted on the mounting frame 32. The barcode scanner 33 is used to acquire the status of the battery cells 31 conveyed on the conveyor belt 18. The barcode scanning module 12 can rotate and can monitor the status of all battery cells 31.

[0039] Advantageously, the cell electromagnetic thermopressing test module 13 includes a movable plate 57, a lifting cylinder 58 disposed on one side of the movable plate 57 and connected to the frame outer cover module, multiple guide rods 21, a thermopressing plate 23 slidably connected to the guide rods 21, and a rope assembly 22 installed on one side of the movable plate 57 and connected to the thermopressing plate 23. An mounting plate 25 is fixedly provided at the end of the guide rod 21 away from the movable plate 57. A drive cylinder 24 connected to the frame outer cover module is mounted on the mounting plate 25, and the piston rod of the drive cylinder 24 is connected to the uppermost thermopressing plate 23. The rope assembly 22, in the prior art, utilizes the principle of a movable pulley, allowing the multi-section structure of the rope assembly 22 to extend and shorten synchronously. It is commonly used in multi-section telescopic booms of cranes. In the cell electromagnetic thermopressing test module 13, the connection with multiple thermopressing plates 23 enables the synchronous movement of multiple thermopressing plates 23, ensuring that the pressure applied to multiple cells 31 is the same.

[0040] Advantageously, the NG buffer module 14 includes a slide rail 26 connected to the frame housing module, a support beam 27 slidably connected to the slide rail 26 via a linear motor, a sliding seat 29 slidably connected to the support beam 27 via a linear motor, a clamping assembly mounted on the sliding seat 29, and a conveyor belt 17 disposed on one side of the support beam 27. The NG buffer module 14 collects defective battery cells 31 and, after a certain quantity, transports them uniformly to a designated location.

[0041] Working principle of this utility model:

[0042] In the initial state, the battery cell 31 is continuously transported from the second conveyor belt 18 to the position of the battery cell electromagnetic thermo-pressure test module 13.

[0043] The barcode scanning module 12 monitors the battery cells 31 to obtain their position information. Taking the embodiment in the attached figure as an example, after the barcode scanning module 12 identifies that four battery cells 31 have passed, it sends a feedback instruction to the electrical control system, the conveyor belt 18 stops conveying, and the clamping unit starts working.

[0044] When the clamping unit is working, the gripper 30 is initially in the open state. The cylinders control the moving plate 19 to move relative to the outer cover module of the frame and the sliding plate 36 to slide relative to the fixed cover 20, so that the four clamping units approach the four battery cells 31. Then the gripper 30 is activated, controlling the piston rods on both sides to move closer, the two clamping cylinders 28 clamp the battery cells 31, and the hook 37 lifts the battery cells 31.

[0045] During the above process, after the two calibration rods 46 touch the battery cell 31, the mounting rod 59 and the rotating sleeve 45 rotate. The torsion spring connected to the clamping cylinder 28 of the rotating sleeve 45 is twisted and accumulates elastic potential energy. When the telescopic rod 44 rotates with the rotating sleeve 45, the two slide. The telescopic rod 44 drives the rack 43 to move. The rack 43 slides with the fixed rail 38. Since the two racks 43 mesh with the control gear at the same time, the distance between the two racks 43 and the speed are always consistent, so that the rotation of the two rotating sleeves 45 is always the same, ensuring that the battery cell 31 is located in the middle position of the two clamping cylinders 28.

[0046] Once all four battery cells 31 are clamped, the control motor 52 and drive motor 49 are activated. The control motor 52 controls the active pulley 54 to rotate, which in turn drives the driven pulley 51 to rotate via the synchronous belt 3 55. The control shaft 56 and the support plate 35 rotate together with the driven pulley 51. Simultaneously, the drive motor 49 controls the transmission pulley 48 to rotate, which in turn drives the drive pulley 60 to rotate via the synchronous belt 2 50. The control sleeve 62 and the rotating pulley rotate together with the drive pulley 60. The rotating pulley drives multiple control pulleys 42 to rotate synchronously via the synchronous belt 1 47. The control pulleys 42 and the support plate 35 rotate in opposite directions. When the support plate 35 rotates from horizontal to vertical, the control pulleys 42 rotate in the opposite direction, causing multiple rotating shafts 41, rotating disks 34, and clamping units to rotate synchronously in the opposite direction, keeping the multiple clamping units horizontal at all times.

[0047] After the posture of multiple battery cells 31 is adjusted, they are simultaneously sent into the battery cell electromagnetic hot pressing test module 13. The drive cylinder 24 is started by the control module of the electrical control module. At the same time, the high-frequency high-voltage current of the hot pressing plate 23 flows through the coil at high speed, generating a high-speed alternating magnetic field to heat the battery cell 31. The piston rod of the drive cylinder 24 drives the uppermost hot pressing plate 23 to press down. The uppermost hot pressing plate 23 and the guide rod 21 slide. Under the action of the rope assembly 22, multiple hot pressing plates 23 will move synchronously, and then squeeze all four at the same time. After the electromagnetic hot pressing is completed, the drive cylinder 24 is reset. The sensors between the multiple hot pressing plates 23 are used to detect the battery cell 31, and the unqualified battery cell 31 is fed back to the electromagnetic control system.

[0048] After receiving the instruction, the NG buffer module 14, in conjunction with the lifting cylinder 58, removes the defective battery cell 31. The lifting cylinder 58 activates the control moving plate 57 to raise and lower, aligning the horizontal position of one of the defective battery cells 31 with the NG buffer module 14. The linear motor controls the bearing beam 27 and the sliding seat 29 to move the clamping assembly of the NG buffer module 14 to the appropriate position, removing the defective battery cell 31 and placing it on the first conveyor belt 17, where it is collected and transported to the designated location. After removing multiple defective battery cells 31 in sequence through the above operations, the battery cell electromagnetic thermo-pressure testing module 13 is reset. The remaining qualified battery cells 31 are removed by the automatic loading and unloading module 11 and placed back on the second conveyor belt 18 for continued transport to the next process.

[0049] When placing the battery cell 31, the clamping unit ensures that the two calibration rods 46 remain in contact with both sides of the battery cell 31 under the action of the torsion spring, which is the same as the clamping principle. Under the action of the control gear, the sliding distance of the two racks 43 is the same, so the battery cell 31 will always remain in the middle of the two clamping cylinders 28. Even if the hooks 37 are worn, the degree of friction between the hooks 37 on both sides and the bottom surface of the battery cell 31 is different. The hooks 37 on one side are not easy to separate the battery cell 31, and will not cause the battery cell 31 to be dragged to one side when it is placed. This ensures that the battery cell 31 is in the effective heating area on the hot pressing plate 23, and ensures the yield of electromagnetic hot pressing.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims of this utility model, they should all fall within the protection scope of this utility model.

Claims

1. A battery cell electromagnetic hot pressing molding equipment, characterized in that: It includes automatic loading and unloading modules, barcode scanning modules, cell electromagnetic thermo-pressure testing modules, NG buffer modules, electrical control modules, and rack housing modules; The automatic loading and unloading module includes a second conveyor belt, a support plate located on one side of the second conveyor belt, and multiple clamping units detachably mounted on the support plate. The clamping unit includes a clamping assembly, which includes a jaw, two clamping cylinders fixedly connected to two piston rods controlled on both sides of the jaw, and a plurality of hooks mounted on the clamping cylinders; the hooks are "L" shaped, the hooks on the two jaws are symmetrical to each other, and a baffle is fixedly provided at the end of the jaw away from the clamping cylinder.

2. The cell electromagnetic hot pressing molding equipment according to claim 1, characterized in that: The two sides of the gripper are fixedly mounted on the connecting block. A rotating disk is fixedly mounted on the side of the connecting block away from the gripping cylinder. A rotating shaft is fixedly mounted on the end of the rotating disk away from the connecting block. The rotating shaft passes through and is rotatably connected to the bearing plate. A control pulley is fixedly mounted on the end of the rotating shaft away from the rotating disk.

3. The cell electromagnetic hot pressing molding equipment according to claim 2, characterized in that: The automatic loading and unloading module further includes a moving plate, a fixed cover fixedly connected to the moving plate, and a sliding plate slidably connected to the fixed cover and controlled by a cylinder; the moving plate is connected to the frame outer cover module through a cylinder, and the bearing plate is rotatably connected to the sliding plate.

4. The cell electromagnetic hot pressing molding equipment according to claim 3, characterized in that: A control motor and a drive motor are respectively installed at both ends of the sliding plate away from the support plate. A control shaft is provided between the drive motor and the control motor. The control shaft passes through and is rotatably connected to the sliding plate. The control shaft is fixedly connected to the support plate. A drive pulley is fixedly provided on the output shaft of the control motor. A driven pulley is provided on one side of the drive pulley. The driven pulley is fixedly connected to the control shaft. The driven pulley and the drive pulley are driven by a synchronous belt.

5. The cell electromagnetic hot pressing molding equipment according to claim 4, characterized in that: A control sleeve is provided around the control shaft. The inner and outer sides of the control sleeve are rotatably connected to the control shaft and the sliding plate, respectively. An installation space is provided in the sliding plate. One end of the control sleeve, which passes through the sliding plate, is located in the installation space. A rotating pulley is provided in the installation space. The rotating pulley is fixedly connected to the control sleeve. The rotating pulley and multiple control pulleys are driven by a synchronous belt. A drive pulley is fixedly provided on the control sleeve. A transmission pulley is fixedly provided on the output shaft of the drive motor. The transmission pulley and the drive pulley are driven by a synchronous belt.

6. The cell electromagnetic hot pressing molding equipment according to claim 1, characterized in that: The barcode scanning module includes a fixed frame and a barcode scanner detachably mounted on the fixed frame. The barcode scanner is used to obtain the status of the battery cells conveyed on the second conveyor belt.

7. The cell electromagnetic hot pressing molding equipment according to claim 1, characterized in that: The cell electromagnetic hot-pressing test module includes a movable plate, a lifting cylinder disposed on one side of the movable plate and connected to the frame outer cover module, multiple guide rods, a hot-pressing plate slidably connected to the guide rods, and a rope assembly installed on one side of the movable plate and connected to the hot-pressing plate; a mounting plate is fixedly provided at the end of the guide rod away from the movable plate, and a drive cylinder connected to the frame outer cover module is installed on the mounting plate, and the piston rod of the drive cylinder is connected to the uppermost hot-pressing plate.

8. The cell electromagnetic hot pressing molding equipment according to claim 1, characterized in that: The NG buffer module includes a slide rail connected to the frame housing module, a load-bearing beam slidably connected to the slide rail via a linear motor, a sliding seat slidably connected to the load-bearing beam via a linear motor, a clamping assembly mounted on the sliding seat, and a conveyor belt disposed on one side of the load-bearing beam.

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