Roundness shaping device and method for lithium battery processing

Abstract

The invention discloses a lithium battery processing roundness shaping device and method, and relates to the technical field of lithium battery processing, the lithium battery processing roundness shaping device comprises a positioning frame, and the inner side of the positioning frame is provided with a position adjusting rounding piece connected with a transverse push rod. By arranging the position adjusting and rounding piece and starting the first servo motor, the shortest distance between the edge of the correction roller and the circle center of the supporting plate is adjusted to be equal to the target radius of the battery cell, the telescopic air cylinder is started, the correction roller moves by a certain distance in the direction away from the circle center of the supporting plate, and one-time rounding treatment can be conducted on the battery cell by rotating the correction roller in the same direction; then the telescopic air cylinder drives the movable sleeve plate to move to enable the positioning plate to be attached to the movable sleeve plate again, so that the shortest distance between the correction roller and the circle center of the supporting plate is equal to the target radius of the battery cell, rounding treatment is conducted on the battery cell again through rotation of the correction roller, and therefore part of internal stress of the pole piece and the diaphragm can be released; and material fracture or drape aggravation caused by forced shaping is avoided.

Description

Technical Field

[0001] This invention relates to the field of lithium battery processing technology, specifically to a roundness shaping device and method for lithium battery processing. Background Technology

[0002] During the battery manufacturing process, after the positive and negative electrode sheets and separator are wound into a cell, defects such as cross-sectional deformation and cell bending are prone to occur, which affect the subsequent cell assembly process. Therefore, the wound cells are rounded to ensure the cylindricity of the cells, which facilitates the subsequent cell assembly operation and improves the battery processing quality and yield.

[0003] When the deformation of the wound cell is large (such as elliptical, bulging or irregular shape), there may be local wrinkles, misalignment or stress concentration in the internal electrodes (positive electrode and negative electrode) and separator. If it is forcibly rounded according to the target diameter, the huge instantaneous pressure will cause the electrodes to bend, the separator to tear, and even cause the risk of short circuit between electrodes. Summary of the Invention

[0004] The purpose of this invention is to provide a roundness shaping device and method for lithium battery processing, in order to solve the problem that electrode bending and separator tearing are easily caused during the rounding process of battery cells.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a roundness shaping device for lithium battery processing, comprising a positioning frame, a support plate mounted on the top of the positioning frame, a plurality of correction rollers disposed on the top of the support plate, the plurality of correction rollers being evenly distributed along the center of the support plate, an L-shaped guide plate disposed on the outer edge of the support plate, a transverse connecting frame disposed on the inner side of the positioning frame below the support plate, a transverse push rod inserted into one end of the L-shaped guide plate, a synchronous connecting frame connected to the end of the transverse push rod near the center of the support plate, the bottom end of the correction rollers being rotatably connected to the top of the synchronous connecting frame via bearings, a groove with a width greater than the diameter of the correction rollers disposed on the top of the support plate, an adjusting and rounding component connected to the transverse push rod disposed on the inner side of the positioning frame, and a multi-position transmission component disposed on the transverse connecting frame for rotating and pressing the correction rollers.

[0006] As a further embodiment of the present invention: the positioning and rounding component includes a first servo motor installed on the bottom inner side of the positioning frame. The output end of the first servo motor is connected to a threaded rod, and a threaded sleeve is fitted onto the threaded rod. A positioning plate is fixedly connected to the outer wall of the threaded sleeve. A telescopic cylinder is provided on the top of the positioning plate. The output end of the telescopic cylinder is connected to a movable sleeve plate located below the positioning plate. An L-shaped connecting rod is installed on the outer wall of the movable sleeve plate. An inclined connecting rod is rotatably connected to the top of the L-shaped connecting rod. The top of the inclined connecting rod is rotatably connected to the end of the transverse push rod away from the center of the support plate through a rotating shaft. Adjustment plates are fixedly connected to both sides of the transverse push rod. The adjustment plates are slidably connected to one side of the L-shaped guide plate. A scale line is provided on one side of the adjustment plate.

[0007] As a further embodiment of the present invention: the end of the adjusting plate near the correction roller is flush with the edge of the correction roller, the zero mark of the scale line is located at the end of the adjusting plate away from the correction roller, and the position where the scale line is aligned with the L-shaped guide plate is the shortest distance between the correction roller and the center of the support plate.

[0008] As a further embodiment of the present invention: the L-shaped guide plate is provided with a through hole on the side away from the support plate, which fits with the transverse push rod and the adjusting plate.

[0009] As a further embodiment of the present invention: the top of the positioning plate is provided with a through hole that penetrates the positioning plate and matches the output end of the rotating sleeve block.

[0010] As a further embodiment of the present invention: the multi-position transmission component includes a second servo motor installed at the bottom of the transverse connecting frame and located above the threaded rod. The output end of the second servo motor is connected to a rotating connecting column that is rotatably connected to the bottom of the support plate. An annular transmission plate is fixedly connected to the outer side of the rotating connecting column. A conical gear ring is provided at the top of the annular transmission plate. The bottom end of the L-shaped guide plate is rotatably connected to a first transmission bevel gear that meshes with the conical gear ring through a bearing. A hexagonal rotating rod is fixedly connected to the end of the first transmission bevel gear near the rotating connecting column. A rotating sleeve block is movably sleeved on the outer side of the hexagonal rotating rod. The bottom of the synchronous connecting frame is rotatably connected to the rotating sleeve block through a bearing. A second transmission bevel gear is provided on the side of the rotating sleeve block near the rotating connecting column. A third transmission bevel gear that meshes with the second transmission bevel gear is provided at the bottom end of the correction roller.

[0011] As a further embodiment of the present invention: the inner sides of both the rotating sleeve and the second transmission bevel gear are provided with through holes that fit with the hexagonal rotating rod.

[0012] As a further embodiment of the present invention: the hexagonal rotating rod is located below the transverse push rod, and the centers of the first transmission bevel gear, the second transmission bevel gear, and the rotating sleeve block are coaxial.

[0013] As a further embodiment of the present invention: the conical gear ring and the rotating connecting column are coaxial, and the conical gear ring and the support plate are coaxial.

[0014] This invention also discloses a roundness shaping method for lithium battery processing, which uses the aforementioned roundness shaping device for lithium battery processing and includes the following steps: S1: Place the wound battery cell to be rounded on top of the tray; S2: Then start the adjustment and rounding component. The operation of the adjustment and rounding component will make the correction rollers move closer to the center of the tray, so as to limit the winding cells on the tray by the three correction rollers. S3: Adjust the closest distance between the edge of the correction roller and the center of the tray to a point slightly smaller than the target radius of the battery by adjusting the rounding component. Start the multi-position transmission component, which drives the rotation of the correction roller to make the battery cell rotate. During this process, the correction roller performs preliminary rounding treatment by squeezing the battery cell. S4: After the correction roller rotates for a period of time, the adjustment and rounding component is activated. The adjustment and rounding component operates again to make the closest distance between the edge of the correction roller and the center of the support plate equal to the target radius of the battery cell. At this time, the multi-position transmission component drives the correction roller to continue rotating. The battery cell is rounded by the correction roller pressing it again.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. By setting the adjustment and rounding component, the first servo motor is started. The operation of the first servo motor causes the threaded rod to rotate. At this time, the threaded sleeve will move vertically along the threaded rod, so that the shortest distance between the edge of the correction roller and the center of the support plate is equal to the target radius of the battery cell. The telescopic cylinder is started, and the correction roller moves a certain distance away from the center of the support plate. Then, the battery cell is placed on the top of the support plate. The correction roller rotates in the same direction to perform a rounding process on the battery cell. Then, the telescopic cylinder drives the movement of the movable sleeve plate to make the positioning plate and the movable sleeve plate fit together again. At this time, the correction roller will move towards the center of the support plate, so that the shortest distance between the edge of the correction roller and the center of the support plate is equal to the target radius of the battery cell. The rotation of the correction roller performs a rounding process on the battery cell again. In this way, the "large deformation" of the battery cell can be adjusted to a "small deformation" close to a circle first, releasing some of the internal stress of the electrode and the separator, and avoiding material breakage or wrinkling caused by forced shaping. 2. By setting up multiple transmission components, the second servo motor is activated after the correction roller contacts the battery cell. The operation of the second servo motor causes the rotating connecting column to drive the annular transmission plate to rotate, which in turn causes the annular transmission plate to drive the first transmission bevel gear to rotate through the bevel gear ring. At this time, the first transmission bevel gear will drive the hexagonal rotating rod to rotate synchronously. During the rotation of the first transmission bevel gear, it will drive the rotating sleeve block and the second transmission bevel gear to rotate through the hexagonal rotating rod, which in turn causes the third transmission bevel gear to drive the correction roller to rotate. In this way, the correction roller can drive the battery cell on the top of the support plate to rotate. During the process of the correction roller causing the battery cell to rotate, the correction roller will squeeze and guide the protrusions or bends of the battery cell, thereby rounding the battery cell. At the same time, through the sliding connection between the rotating sleeve block, the second transmission bevel gear and the hexagonal rotating rod, the second transmission bevel gear can move synchronously with the correction roller through the synchronous connecting frame when the transverse push rod drives the correction roller to move. At the same time, the second transmission bevel gear and the third transmission bevel gear are always in a meshing state. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the top structure of the transverse connecting frame of the present invention; Figure 4 This is a schematic diagram showing the connection between the correction roller and the conical gear ring of the present invention; Figure 5 This is a schematic diagram showing the connection between the correction roller and the first transmission bevel gear of the present invention; Figure 6 This is a schematic diagram of the internal structure of the positioning frame of the present invention; Figure 7 This is a schematic diagram showing the connection between the hexagonal rotating rod and the conical gear ring of the present invention; Figure 8 This is a schematic diagram showing the connection between the hexagonal rotating rod and the second transmission bevel gear of the present invention.

[0017] In the diagram: 1. Positioning frame; 2. Support plate; 3. L-shaped guide plate; 4. Correction roller; 5. Transverse connecting frame; 6. First servo motor; 7. Threaded rod; 8. Movable sleeve plate; 9. Threaded sleeve; 10. L-shaped connecting rod; 11. Inclined connecting rod; 12. Adjustment plate; 13. Scale line; 14. Hexagonal rotating rod; 15. Bevel gear ring; 16. First transmission bevel gear; 17. Synchronous connecting frame; 18. Second servo motor; 19. Rotating connecting column; 20. Second transmission bevel gear; 21. Rotating sleeve block; 22. Annular transmission plate; 23. Third transmission bevel gear; 24. Telescopic cylinder; 25. Positioning plate; 26. Transverse push rod. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0020] Please see Figures 1 to 8 In this embodiment of the invention, a roundness shaping device for lithium battery processing includes a positioning frame 1, a support plate 2 mounted on the top of the positioning frame 1, a plurality of correction rollers 4 disposed on the top of the support plate 2, and the plurality of correction rollers 4 being distributed at equal distances along the center of the support plate 2, an L-shaped guide plate 3 disposed at the outer edge of the support plate 2, a transverse connecting frame 5 disposed on the inner side of the positioning frame 1 located below the support plate 2, a transverse push rod 26 inserted into one end of the L-shaped guide plate 3, a synchronous connecting frame 17 connected to the end of the transverse push rod 26 near the center of the support plate 2, the bottom end of the correction roller 4 being rotatably connected to the top of the synchronous connecting frame 17 via a bearing, a groove with a width greater than the diameter of the correction roller 4 disposed on the top of the support plate 2, an adjusting and rounding component connected to the transverse push rod 26 disposed on the inner side of the positioning frame 1, and a multi-position transmission component for rotating and pressing the correction roller 4 disposed on the transverse connecting frame 5.

[0021] In this embodiment: First, the wound battery cell to be rounded is placed on top of the tray 2. Then, the adjusting and rounding mechanism is activated. The operation of the adjusting and rounding mechanism moves the alignment rollers 4 closer to the center of the tray 2, thereby limiting the winding battery cell on the tray 2 by the three alignment rollers 4. The adjusting and rounding mechanism adjusts the closest distance between the edge of the alignment rollers 4 and the center of the tray 2 to be slightly smaller than the target radius of the battery. The multi-position transmission mechanism is activated, driving the rotation of the alignment rollers 4 to rotate the battery cell. During this process, the alignment rollers 4 perform initial rounding by squeezing the battery cell. After the alignment rollers 4 have rotated for a period of time, the adjusting and rounding mechanism is activated again. The operation of the adjusting and rounding mechanism makes the closest distance between the edge of the alignment rollers 4 and the center of the tray 2 equal to the target radius of the battery cell. At this time, the multi-position transmission mechanism drives the alignment rollers 4 to continue rotating, and the alignment rollers 4 squeeze the battery cell again to perform rounding, thereby reducing the "large deformation" of the battery cell. Adjusting to a near-circular "small deformation" releases some of the internal stress in the electrode and diaphragm, preventing material breakage or increased wrinkling caused by forced shaping.

[0022] Please refer to this carefully. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 The positioning and aligning component includes a first servo motor 6 installed at the bottom inner side of the positioning frame 1. The output end of the first servo motor 6 is connected to a threaded rod 7. A threaded sleeve 9 is fitted onto the threaded rod 7. A positioning plate 25 is fixedly connected to the outer wall of the threaded sleeve 9. A telescopic cylinder 24 is provided on the top of the positioning plate 25. The output end of the telescopic cylinder 24 is connected to a movable sleeve 8 located below the positioning plate 25. An L-shaped connecting rod 10 is installed on the outer wall of the movable sleeve 8. An inclined connecting rod 11 is rotatably connected to the top of the L-shaped connecting rod 10. The top of the inclined connecting rod 11 is rotatably connected to the end of the transverse push rod 26 away from the center of the support plate 2 via a rotating shaft. Adjustment plates 12 are fixedly connected to both sides of the transverse push rod 26. The adjustment plates 12 are slidably connected to one side of the L-shaped guide plate 3. A scale line 13 is provided on one side of the adjustment plate 12.

[0023] Among them, the end of the adjusting plate 12 near the correction roller 4 is flush with the edge of the correction roller 4, the zero mark of the scale line 13 is located at the end of the adjusting plate 12 away from the correction roller 4, and the position where the scale line 13 is aligned with the L-shaped guide plate 3 is the shortest distance between the correction roller 4 and the center of the support plate 2. The side of the L-shaped guide plate 3 away from the support plate 2 is provided with a through hole that matches the transverse push rod 26 and the adjusting plate 12. The top of the positioning plate 25 is provided with a through hole that penetrates the positioning plate 25 and matches the output end of the rotating sleeve block 21.

[0024] In this embodiment: The first servo motor 6 is started, and the operation of the first servo motor 6 causes the threaded rod 7 to rotate. At this time, the threaded sleeve 9 will move vertically along the threaded rod 7. During the upward movement of the threaded sleeve 9, the positioning plate 25 will drive the movable sleeve 8 to move upward, thereby causing the L-shaped connecting rod 10 to press against the inclined connecting rod 11. This allows the transverse push rod 26 to push the synchronous connecting frame 17 to move the correction roller 4 towards the center of the support plate 2. According to the position of the adjusting plate 12 corresponding to the L-shaped guide plate 3, the target radius of the battery cell is adjusted to be equal to the closest distance between the edge of the correction roller 4 and the center of the support plate 2. Then, the telescopic cylinder 24 is started. The extension of the telescopic cylinder 24 causes the movable sleeve 8 to move downward relative to the threaded sleeve 9, thereby separating the positioning plate 25 from the movable sleeve 8. At this time, the movable sleeve 8 moves downward, causing the correction roller 4 to move a certain distance away from the center of the support plate 2. The shortest distance from the edge of the correction roller 4 to the center of the support plate 2 will be greater than the target radius of the battery cell. Then, the battery cell is placed on top of the support plate 2, and then the multi-position transmission component is activated. The operation of the multi-position transmission component causes the correction roller 4 on the support plate 2 to rotate in the same direction. This causes the correction roller 4 to drive the battery cell to rotate. At this time, the blocking limit of the correction roller 4 can perform a rounding process on the battery cell. Then, the telescopic cylinder 24 drives the movable sleeve plate 8 to move so that the positioning plate 25 and the movable sleeve plate 8 are in contact again. At this time, the correction roller 4 will move towards the center of the support plate 2, so that the shortest distance from the edge of the correction roller 4 to the center of the support plate 2 is equal to the target radius of the battery cell. Then, with the operation of the multi-position transmission component, the correction roller 4 performs a rounding process on the battery cell again. This can prevent the "large deformation" of the battery cell from being adjusted to a "small deformation" that is close to a circle, release some of the internal stress of the electrode and the separator, and avoid material breakage or increased wrinkling caused by forced shaping.

[0025] Please refer to this carefully. Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8The multi-position transmission components include a second servo motor 18 installed at the bottom of the transverse connecting frame 5 and located above the threaded rod 7. The output end of the second servo motor 18 is connected to a rotating connecting column 19 that is rotatably connected to the bottom of the support plate 2. An annular transmission plate 22 is fixedly connected to the outside of the rotating connecting column 19. A bevel gear ring 15 is provided on the top of the annular transmission plate 22. The bottom end of the L-shaped guide plate 3 is rotatably connected to a first transmission bevel gear 16 that meshes with the bevel gear ring 15 through a bearing. A hexagonal rotating rod 14 is fixedly connected to one end of the first transmission bevel gear 16 near the rotating connecting column 19. A rotating sleeve block 21 is movably sleeved on the outside of the hexagonal rotating rod 14. The bottom of the synchronous connecting frame 17 is rotatably connected to the rotating sleeve block 21 through a bearing. A second transmission bevel gear 20 is provided on one side of the rotating sleeve block 21 near the rotating connecting column 19. A third transmission bevel gear 23 that meshes with the second transmission bevel gear 20 is provided at the bottom end of the correction roller 4.

[0026] The inner sides of the rotating sleeve 21 and the second transmission bevel gear 20 are provided with through holes that fit with the hexagonal rotating rod 14. The hexagonal rotating rod 14 is located below the transverse push rod 26. The centers of the first transmission bevel gear 16, the second transmission bevel gear 20, and the rotating sleeve 21 are coaxial. The centers of the bevel gear ring 15 and the rotating connecting column 19 are coaxial. The center of the bevel gear ring 15 and the support plate 2 are coaxial.

[0027] In this embodiment: after the correction roller 4 contacts the battery cell, the second servo motor 18 is activated. The operation of the second servo motor 18 causes the rotating connecting column 19 to drive the annular transmission plate 22 to rotate. This causes the annular transmission plate 22 to drive the first transmission bevel gear 16 to rotate via the bevel gear ring 15. At this time, the first transmission bevel gear 16 will drive the hexagonal rotating rod 14 to rotate synchronously. During the rotation of the first transmission bevel gear 16, it will drive the rotating sleeve 21 and the second transmission bevel gear 20 to rotate via the hexagonal rotating rod 14. This causes the third transmission bevel gear 23 to drive the correction roller. 4. Rotation causes the correction roller 4 to rotate the battery cell on top of the support plate 2. As the correction roller 4 rotates the battery cell, it will squeeze and guide the protrusions or bends of the battery cell to make the battery cell round. At the same time, through the sliding connection of the rotating sleeve block 21, the second transmission bevel gear 20 and the hexagonal rotating rod 14, the second transmission bevel gear 20 can move synchronously with the correction roller 4 through the synchronous connecting frame 17 when the transverse push rod 26 moves the correction roller 4. At the same time, the second transmission bevel gear 20 and the third transmission bevel gear 23 are always in a meshing state.

[0028] The following describes a method for roundness shaping in lithium battery processing, based on the aforementioned roundness shaping device, specifically including the following steps: S1: Place the wound battery cell to be rounded on top of the tray 2; S2: Start the first servo motor 6. The operation of the first servo motor 6 causes the threaded rod 7 to rotate. At this time, the threaded sleeve 9 will move vertically along the threaded rod 7. During the upward movement of the threaded sleeve 9, the positioning plate 25 will drive the movable sleeve plate 8 to move upward, so that the L-shaped connecting rod 10 will press against the inclined connecting rod 11. In this way, the transverse push rod 26 can push the synchronous connecting frame 17 to move the correction roller 4 towards the center of the support plate 2. According to the position of the adjusting plate 12 corresponding to the L-shaped guide plate 3, the target radius of the battery cell is adjusted to be equal to the closest distance between the edge of the correction roller 4 and the center of the support plate 2. S3: Activate the telescopic cylinder 24. The extension of the telescopic cylinder 24 causes the movable sleeve 8 to move downwards relative to the threaded sleeve 9, thereby separating the positioning plate 25 from the movable sleeve 8. At this time, the downward movement of the movable sleeve 8 drives the correction roller 4 to move a distance away from the center of the support plate 2. The shortest distance from the edge of the correction roller 4 to the center of the support plate 2 will then be greater than the target radius of the battery cell. Afterwards, place the battery cell on top of the support plate 2 and activate the second servo motor 18. The operation of the second servo motor 18 causes the rotating connecting column 19 to drive the annular transmission plate 22 to rotate, thereby causing the annular transmission plate 22 to pass through the bevel gear ring 1. 5 drives the first transmission bevel gear 16 to rotate. At this time, the first transmission bevel gear 16 will drive the hexagonal rotating rod 14 to rotate synchronously. During the rotation of the first transmission bevel gear 16, it will drive the rotating sleeve block 21 and the second transmission bevel gear 20 to rotate through the hexagonal rotating rod 14, thereby causing the third transmission bevel gear 23 to drive the correction roller 4 to rotate. In this way, the correction roller 4 can drive the battery cell on the top of the support plate 2 to rotate. During the process of the correction roller 4 pushing the battery cell to rotate, the correction roller 4 will squeeze and guide the protrusion or bending part of the battery cell. At this time, the battery cell can be rounded once by the blocking and limiting of the correction roller 4. S4: Then, the telescopic cylinder 24 drives the movable sleeve plate 8 to move so that the positioning plate 25 and the movable sleeve plate 8 are put into contact again. At this time, the correction roller 4 will move towards the center of the support plate 2 so that the shortest distance from the edge of the correction roller 4 to the center of the support plate 2 is equal to the target radius of the battery cell. Then, with the operation of the multi-position transmission component, the correction roller 4 will perform rounding treatment on the battery cell again. This can prevent the "large deformation" of the battery cell from being adjusted to a "small deformation" that is close to a circle, release some of the internal stress of the electrode and the separator, and avoid material breakage or wrinkling caused by forced shaping.

[0029] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A roundness shaping device for lithium battery processing, comprising a positioning frame (1), characterized in that, The top of the positioning frame (1) is equipped with a tray (2), and the top of the tray (2) is provided with multiple correction rollers (4), which are distributed at equal distances along the center of the tray (2). An L-shaped guide plate (3) is provided at the outer edge of the tray (2). A transverse connecting frame (5) located below the tray (2) is provided on the inner side of the positioning frame (1). A transverse push rod (26) is inserted into one end of the L-shaped guide plate (3). A synchronous connecting frame (17) is connected to one end of the transverse push rod (26) near the center of the tray (2). The bottom end of the correction roller (4) is rotatably connected to the top of the synchronous connecting frame (17) through a bearing. The top of the tray (2) is provided with a groove wider than the diameter of the correction roller (4). An adjustment and rounding component connected to the transverse push rod (26) is provided on the inner side of the positioning frame (1). A multi-position transmission component for rotating and pressing the correction roller (4) is provided on the transverse connecting frame (5).

2. The roundness shaping device for lithium battery processing according to claim 1, characterized in that, The adjusting and rounding component includes a first servo motor (6) installed on the bottom inner side of the positioning frame (1). The output end of the first servo motor (6) is connected to a threaded rod (7). A threaded sleeve (9) is fitted onto the threaded rod (7). A positioning plate (25) is fixedly connected to the outer wall of the threaded sleeve (9). A telescopic cylinder (24) is provided on the top of the positioning plate (25). The output end of the telescopic cylinder (24) is connected to a movable sleeve (8) located below the positioning plate (25). An L-shaped connecting rod (10) is installed on the outer wall of the moving sleeve plate (8). An inclined connecting rod (11) is rotatably connected to the top of the L-shaped connecting rod (10). The top of the inclined connecting rod (11) is rotatably connected to the end of the transverse push rod (26) away from the center of the support plate (2) through a rotating shaft. Adjusting plates (12) are fixedly connected to both sides of the transverse push rod (26). The adjusting plates (12) are slidably connected to one side of the L-shaped guide plate (3). A scale line (13) is provided on one side of the adjusting plates (12).

3. The roundness shaping device for lithium battery processing according to claim 2, characterized in that, The end of the adjusting plate (12) near the correction roller (4) is flush with the edge of the correction roller (4). The zero mark of the scale line (13) is located at the end of the adjusting plate (12) away from the correction roller (4). The position where the scale line (13) is aligned with the L-shaped guide plate (3) is the shortest distance between the correction roller (4) and the center of the support plate (2).

4. The roundness shaping device for lithium battery processing according to claim 2, characterized in that, The L-shaped guide plate (3) has a through hole on the side away from the support plate (2) that matches the transverse push rod (26) and the adjusting plate (12).

5. The roundness shaping device for lithium battery processing according to claim 2, characterized in that, The top of the positioning plate (25) is provided with a through hole that penetrates the positioning plate (25) and matches the output end of the rotating sleeve (21).

6. The roundness shaping device for lithium battery processing according to claim 2, characterized in that, The multi-position transmission component includes a second servo motor (18) installed at the bottom of the transverse connecting frame (5) and located above the threaded rod (7). The output end of the second servo motor (18) is connected to a rotating connecting column (19) that is rotatably connected to the bottom of the support plate (2). An annular transmission plate (22) is fixedly connected to the outside of the rotating connecting column (19). A conical gear ring (15) is provided on the top of the annular transmission plate (22). The bottom end of the L-shaped guide plate (3) is rotatably connected to a first transmission cone that meshes with the conical gear ring (15) through a bearing. The gear (16) has a hexagonal rotating rod (14) fixedly connected to one end of the first transmission bevel gear (16) near the rotating connecting column (19). A rotating sleeve block (21) is movably sleeved on the outer side of the hexagonal rotating rod (14). The bottom of the synchronous connecting frame (17) is rotatably connected to the rotating sleeve block (21) through a bearing. A second transmission bevel gear (20) is provided on the side of the rotating sleeve block (21) near the rotating connecting column (19). A third transmission bevel gear (23) that meshes with the second transmission bevel gear (20) is provided at the bottom end of the correction roller (4).

7. The roundness shaping device for lithium battery processing according to claim 6, characterized in that, Both the rotating sleeve (21) and the inner side of the second transmission bevel gear (20) are provided with through holes that fit with the hexagonal rotating rod (14).

8. The roundness shaping device for lithium battery processing according to claim 6, characterized in that, The hexagonal rotating rod (14) is located below the transverse push rod (26), and the first transmission bevel gear (16), the second transmission bevel gear (20), and the rotating sleeve block (21) are coaxial.

9. The roundness shaping device for lithium battery processing according to claim 6, characterized in that, The conical gear ring (15) and the rotating connecting column (19) are coaxial, and the conical gear ring (15) and the support plate (2) are coaxial.

10. A method for roundness shaping in lithium battery processing, characterized in that, The roundness shaping apparatus for lithium battery processing according to any one of claims 1-9 includes the following steps: S1: Place the wound battery cell to be rounded on top of the tray (2); S2: Then start the adjustment and rounding component. The operation of the adjustment and rounding component will make the correction roller (4) move closer to the center of the tray (2), so that the three correction rollers (4) will limit the winding cell on the tray (2). S3: Adjust the closest distance between the edge of the correction roller (4) and the center of the tray (2) to be slightly smaller than the target radius of the battery by adjusting the rounding component. Start the multi-position transmission component. The multi-position transmission component drives the rotation of the correction roller (4) to make the battery cell rotate. During this process, the correction roller (4) performs preliminary rounding treatment on the correction roller (4) by squeezing the battery cell. S4: After the correction roller (4) rotates for a period of time, the adjustment and rounding component is started. The adjustment and rounding component is operated again so that the closest distance between the edge of the correction roller (4) and the center of the tray (2) is equal to the target radius of the battery cell. At this time, the multi-position transmission component drives the correction roller (4) to continue to rotate. The battery cell is rounded by the correction roller (4) pressing the battery cell again.

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