Battery cell winding device and method for winding battery cell

Abstract

The invention relates to the technical field of lithium battery processing equipment, and discloses a battery cell winding device and a battery cell winding method, and the battery cell winding device comprises a winding device and a cutting mechanism; the winding device comprises a rotating tower, the rotating tower is installed on the winding machine body through a vertical plate, a first gear is fixed to the outer wall of the circumference of the rotating tower and meshed with a motor gear, a plurality of cylinders are arranged in the rotating tower, winding needle shaft sleeves are installed in the cylinders, and the winding needle shaft sleeves are arranged in the winding needle shaft sleeves. And one end of the tail part of the winding needle shaft sleeve is connected with a double-acting cylinder which is used for driving the whole winding needle shaft sleeve and an internal mechanism to move back and forth. The diameter of the winding needle is increased through the inflatable shaft for winding, the diameter of the winding needle is reduced after winding, the diaphragm clamped by the winding needle is cut off by the cutting knife, and the cut part of the diaphragm is tightly attached to the wall of the central hole by the winding needle, so that the problem of deformation of an inner-layer structure of a battery cell caused by needle drawing after winding is solved, and meanwhile, the situation that the diaphragm in the central hole of the battery cell rebounds to prevent a bottom needle from entering the central hole is avoided; and the battery cell is scrapped.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing equipment, and in particular to a battery cell winding device and a battery cell winding method. Background Art

[0002] The cell winding device is one of the important equipment used in the manufacture of lithium-ion batteries. Its main function is to accurately wind the positive electrode sheet, negative electrode sheet and diaphragm material of the battery into a cell in a specific order. This process is a key step in the manufacture of lithium batteries. In the winding process, the positive and negative electrode sheets are generally wound with two layers of diaphragms. The diaphragms are usually made of PP or PE materials, which are soft and elastic. The shape of the diaphragm in the center hole of the cell after winding directly determines the success rate of the subsequent bottoming process.

[0003] However, in the existing battery cell production process, after the battery cell is wound, due to a certain tension during winding, the inner diaphragm of the battery cell is in close contact with the winding needle, and the withdrawal action of the winding needle can easily cause the inner structure of the battery cell to deform. At the same time, since the diaphragm is soft and has a certain elasticity, the diaphragm in the center hole is easily deformed after the winding needle is pulled out, thereby affecting the bottom needle from entering the center hole, and even directly causing the battery cell to be scrapped. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a battery cell winding device and a method for battery cell winding, which solve the problems of deformation of the inner layer of the core caused by the withdrawal action of the winding needle during the winding process and rebound of the diaphragm in the center hole of the battery cell causing obstruction of the bottom needle from entering the center hole, resulting in the scrapping of the battery cell.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a battery core winding device, including a winding device and a cutting mechanism;

[0006] The winding device includes a turret, which is installed on the winding machine body through a vertical plate. A gear one is fixed to the circumferential outer wall of the turret, and the gear one is meshed with the motor gear. A plurality of cylinders are arranged inside the turret, and a winding needle sleeve is installed inside each cylinder. One end of the tail of the winding needle sleeve is connected to a double-acting cylinder, which is used to drive the entire winding needle sleeve and the internal mechanism to move forward and backward. The winding needle sleeve is hollow and is equipped with two semi-arc winding needle shafts, and a semi-cylindrical winding needle is connected to the front side of each semi-arc winding needle shaft. The two semi-cylindrical winding needles are combined into a cylindrical winding needle and there is a gap between the two semi-cylinders. An air expansion shaft is arranged in the middle of the two semi-arc winding needle shafts.

[0007] Preferably, the cutting mechanism comprises a needle hole and a cutting knife, a dust suction pipe is fixed to the tail end of the cutting knife, and a cylinder is installed on the rear side of the dust suction pipe for driving the cutting knife to move forward and backward.

[0008] Preferably, the cylinder is provided with a rectangular hole, the turret is provided with a driving motor through the rectangular hole, and the driving motor gear is meshed with the second gear on the outer wall of the winding needle sleeve through the rectangular hole.

[0009] Preferably, the outer wall of the winding needle sleeve is provided with a second gear, and the second gear on the outer wall of the winding needle sleeve is meshed with the motor gear.

[0010] Preferably, the inner wall of the winding needle shaft sleeve is provided with a plurality of rectangular grooves, the outer wall of the semicircular arc winding needle shaft is provided with a plurality of rectangular protrusions, and the rectangular protrusions are embedded in the rectangular grooves of the inner wall of the winding needle shaft sleeve.

[0011] Preferably, one end of the inflatable shaft is connected to the compressed air pipe via a high-speed rotary joint.

[0012] Preferably, a groove is longitudinally provided inside the semi-cylindrical rolling needle, and the groove is perpendicular to the plane of the semi-cylindrical rolling needle.

[0013] A method for winding a battery cell using a battery cell winding device comprises the following steps:

[0014] S1. Needle winding preparation and diaphragm positioning: When the turret rotates so that the cylinder is in the upper position, the air expansion shaft starts to work, increasing the diameter of the two semi-arc needle winding shafts. Since the front end of the semi-arc needle winding shaft is connected to the semi-cylindrical needle winding, the diameter of the cylinder composed of the two semi-cylindrical needle windings is increased from 3.4mm to 3.5mm after the air expansion shaft is inflated. The protrusion on the needle winding shaft moves relatively in the rectangular groove of the needle winding shaft sleeve. The double-acting cylinder is started at the same time to drive the semi-arc needle winding shaft to move forward. Since the semi-arc needle winding shaft is engaged with the winding shaft sleeve through the protrusion, the needle winding shaft is driven to move forward until the front section of the semi-arc needle winding shaft contacts the front end of the cylinder. At this time, the needle winding extends from the front end of the cylinder. At the same time, the diaphragm enters the middle of the two semi-cylindrical needle windings through the front section of the semi-cylindrical needle winding, and the front section of the semi-cylindrical needle winding enters the needle winding hole, preparing for the next operation;

[0015] S2, winding of the diaphragm and the electrode sheet: Subsequently, the motor located outside the turret cylinder starts to start, and drives the winding needle shaft sleeve to rotate clockwise through gear 2. Since the winding needle shaft sleeve is embedded with the semi-circular arc winding needle shaft through the rectangular protrusion, the winding needle shaft starts to rotate, driving the semi-cylindrical winding needle to wind the diaphragm. At this time, the negative electrode sheet is inserted between the semi-cylindrical winding needle and the left diaphragm through the sheet feeding device. After completing one round of winding, the positive electrode sheet feeding device inserts the positive electrode ear between the two layers of diaphragms to complete the sheet feeding operation. The motor continues to work until the entire winding process is completed;

[0016] S3, diaphragm cutting and cleaning: After winding is completed, the motor stops to ensure that the groove of the semi-cylindrical winding needle is parallel to the cutting knife. At this time, the cylinder at the tail of the cutting knife starts to push the cutting knife into the groove of the two semi-cylindrical winding needles to complete the diaphragm cutting. At the same time, the dust suction pipe on the cutting knife winding needle bracket starts to work to clean the diaphragm debris generated by cutting. After cutting is completed, the cylinder retracts the cutting knife to the initial position;

[0017] S4, diaphragm finishing and tape sticking: After the cutting is completed, the turret driving device rotates it 60° and moves the cylinder from the top to the lower left. At this time, the diaphragm pressing roller is extended under the drive of the double-acting cylinder to press the diaphragm. At the same time, another double-acting cylinder drives the diaphragm cutter to extend and cut the diaphragm. Then, the motor starts to work and drives the winding needle shaft sleeve to rotate clockwise through gear 2 to complete the finishing and winding of the cut diaphragm. At the same time, the glue sticking mechanism extends to stick the tape on the battery cell. In this process, the device in the cylinder located at the top position repeats steps S1 to S3, while the device located at the lower left continues to perform the finishing operation of the diaphragm;

[0018] S5. Removal of the winding core and resetting of the device: As the turret rotates 60° again, the material removal claw starts to work and clamps the battery cell. At this time, the air expansion shaft is released, and the diameter of the semi-cylindrical winding needle shrinks from 3.5mm to 3.4mm. Motor 2 is started again to drive the semi-cylindrical winding needle to rotate, so that the cut diaphragm is close to the hole wall. The double-acting cylinder then drives the winding needle shaft to retract, and the material removal claw takes out the winding core and places it in the tray. At the same time, the device located directly above repeats steps S1 to S3, and the device in the lower left cylinder repeats the operation of step S4.

[0019] Working principle: When the equipment is used for winding operations, the motor gear that meshes with the turret and gear 1 drives the turret to rotate, so that the cylinder in the turret moves to different positions during the processing. Inside the cylinder, the winding needle shaft sleeve pushes the winding needle shaft forward under the action of the cylinder, so that the diaphragm enters the middle of the two semi-cylindrical winding needles. Then, the motor drives the winding needle shaft sleeve to rotate through gear 2, thereby driving the winding needle shaft to perform the winding operation to complete the winding of the diaphragm and the electrode piece. After winding, the cutting knife enters the groove of the winding needle under the push of the cylinder to cut the diaphragm. At the same time, the dust collection pipe starts to clean up the debris. After cutting is completed, the turret rotates again, the material picking device clamps the finished battery cell, retracts the winding needle shaft and puts the battery cell into the required position. The continuous rotation of the turret ensures the synchronous work of multiple stations and ensures the continuity of production.

[0020] The present invention provides a battery core winding device and a battery core winding method, which have the following beneficial effects:

[0021] 1. The present invention realizes an assembly line-type battery cell winding production method, thereby improving the winding efficiency and further shortening the production cycle of each battery cell.

[0022] 2. The present invention is suitable for winding battery cells of various models and sizes, and ensures that when the needle is pulled out after the winding of the battery cell is completed, the diameter of the winding needle is reduced to avoid the problem of deformation of the inner structure of the battery cell caused by the needle pulling out. At the same time, the diaphragm can be cut so that the diaphragm is close to the wall of the center hole, so that the diaphragm in the center hole of the battery cell rebounds and blocks the bottom needle from entering the center hole, resulting in the scrapping of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of a turret of the present invention;

[0024] Figure 2 It is a schematic diagram of a cylinder of the present invention;

[0025] Figure 3 It is a schematic diagram of the cutting mechanism of the present invention;

[0026] Figure 4 It is a schematic diagram of a cutting knife of the present invention;

[0027] Figure 5 It is a schematic diagram of the internal structure of the winding needle sleeve of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the semi-cylindrical winding needle part of the present invention;

[0029] Figure 7 The figure is a flow chart of the method steps of the present invention.

[0030] Among them, 1. turret; 2. gear one; 3. cylinder; 4. needle winding shaft sleeve; 5. semi-arc needle winding shaft; 6. semi-cylindrical needle winding; 7. air expansion shaft; 8. needle winding hole; 9. cutting knife; 10. dust suction pipe; 11. cylinder; 12. rectangular hole; 13. gear two; 14. rectangular protrusion; 15. groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] Please refer to the attached Figure 1 -Attached Figure 4 , an embodiment of the present invention provides a battery cell winding device, including a winding device and a cutting mechanism;

[0034] The winding device includes a turret 1, which is installed on the winding machine body through a vertical plate. A gear 2 is fixed to the outer circumferential wall of the turret 1, and the gear 2 is meshed with the motor gear. A plurality of cylinders 3 are arranged inside the turret 1, and a winding needle sleeve 4 is installed inside the cylinder 3. One end of the tail of the winding needle sleeve 4 is connected to a double-acting cylinder, which is used to drive the entire winding needle sleeve 4 and the internal mechanism to move forward and backward. The winding needle sleeve 4 is hollow and is equipped with two semi-arc winding needle shafts 5. A semi-cylindrical winding needle 6 is connected to the front side of each semi-arc winding needle shaft 5. The two semi-cylindrical winding needles 6 are combined into a cylindrical winding needle and there is a gap between the two semi-cylinders. An air expansion shaft 7 is arranged in the middle of the two semi-arc winding needle shafts 5; please refer to the attached Figure 5 -Attached Figure 6 , the outer wall of the semicircular needle winding shaft 5 has a plurality of rectangular protrusions 14, and the rectangular protrusions 14 are embedded in the rectangular grooves on the inner wall of the needle winding sleeve 4; one end of the air expansion shaft 7 is connected to the compressed air pipe through a high-speed rotating joint; the cutting mechanism includes a needle winding hole 8 and a cutting knife 9, a dust suction pipe 10 is fixed to the tail end of the cutting knife 9, and a cylinder 11 is installed on the rear side of the dust suction pipe 10 for driving the cutting knife 9 to move forward and backward; the cylinder 3 is provided with a rectangular hole 12, and the turret 1 is provided with a driving motor through the rectangular hole 12, and the driving motor gear is meshed with the gear 2 13 on the outer wall of the needle winding sleeve 4 through the rectangular hole 12; the outer wall of the needle winding sleeve 4 is provided with a gear 2 13, and the gear 2 13 on the outer wall of the needle winding sleeve 4 is meshed with the motor gear; the inner wall of the needle winding sleeve 4 has a plurality of rectangular grooves, please refer to the attached Figure 5 -Attached Figure 6 The outer wall of the semicircular needle winding shaft 5 has multiple rectangular protrusions 14, and the rectangular protrusions 14 are embedded in the rectangular grooves on the inner wall of the needle winding shaft sleeve 4; one end of the air expansion shaft 7 is connected to the compressed air pipe through a high-speed rotating joint; a groove 15 is opened longitudinally inside the semi-cylindrical needle winding 6, and the groove 15 is perpendicular to the plane of the semi-cylindrical needle winding 6.

[0035] Specifically, the device drives the cylinder 3 to rotate by meshing with the gear 1 2 through the turret 1, so that the cylinder 3 can be moved to multiple processing positions according to the set path during the processing. This movement method can effectively ensure the precise positioning of the device during the production process, thereby improving the efficiency of the winding operation. In the device, the winding needle sleeve 4 pushes the semi-circular arc winding needle shaft 5 forward through the double-acting cylinder, so that the semi-cylindrical winding needle 6 passes through the winding needle hole 8 to accurately position the diaphragm. This positioning method ensures that the diaphragm is stable and accurate during the winding process, and reduces the scrap rate caused by position deviation. Then, the motor drives the winding needle sleeve 4 to rotate through the gear 2 13, thereby driving the semi-circular arc winding needle shaft 5 to perform the automatic winding operation of the diaphragm, completing the uniform winding process of the diaphragm, and ensuring the stability of the winding quality. After the diaphragm is wound, the cutting The cutter 9 is pushed by the cylinder 11 to enter the groove 15 of the air expansion shaft 7 to realize the automatic cutting operation of the diaphragm. At the same time, the dust suction pipe 10 is started synchronously to automatically clean up the debris generated during the cutting process to avoid the residual debris from affecting the quality of the battery cell, further improving the degree of automation and cleanliness of the operation. After the cutting operation is completed, the turret 1 rotates again, and the automatic material picking device is started. The finished battery cell is accurately clamped by the clamp, and the battery cell is automatically placed in the required position with the retraction action of the semi-circular arc winding needle shaft 5. The whole process is smooth and efficient. The continuous rotation of the turret 1 and the synchronous working design of multiple workstations effectively improve the overall efficiency of the winding operation, reduce the need for manual intervention, ensure the continuity and automation level of the production process, and greatly improve the production efficiency and product quality stability.

[0036] Embodiment 2:

[0037] Please refer to the attached Figure 7 , a method for winding a battery cell by a battery cell winding device, comprising the following steps:

[0038] S1. Preparation for needle winding and positioning of diaphragm: When the turret 1 rotates so that the cylinder 3 is in the upper position, the air expansion shaft 7 starts to work, increasing the diameter of the two semi-arc needle winding shafts 5. Since the front end of the semi-arc needle winding shaft 5 is connected to the semi-cylindrical needle winding 6, the diameter of the cylinder formed by the two semi-cylindrical needle windings 6 is increased from 3.4 mm to 3.5 mm after the air expansion shaft is inflated. The protrusion 14 on the needle winding shaft 5 moves relatively in the rectangular groove of the needle winding shaft sleeve 4. The double-acting cylinder is started at the same time to drive the semi-arc needle winding shaft 5 to move forward. Since the semi-arc needle winding shaft 5 is engaged with the winding shaft sleeve 4 through the protrusion 14, the needle winding shaft is driven to move forward until the front section of the semi-arc needle winding shaft 5 contacts the front end of the cylinder 3. At this time, the needle winding 6 extends from the front end of the cylinder 3. At the same time, the diaphragm enters the middle of the two semi-cylindrical needle windings 6 through the front section of the semi-cylindrical needle winding 6, and the front section of the semi-cylindrical needle winding 6 penetrates into the needle winding hole 8, preparing for the next step of operation;

[0039] S2, winding of the diaphragm and the electrode sheet: Subsequently, the motor located outside the turret 1 cylinder 3 starts to start, and drives the winding needle shaft sleeve 4 to rotate clockwise through the gear 2 13. Since the winding needle shaft sleeve 4 is embedded with the semi-circular arc winding needle shaft 5 through the rectangular protrusion 14, the winding needle shaft 5 starts to rotate, driving the semi-cylindrical winding needle 6 to wind the diaphragm. At this time, the negative electrode sheet is inserted between the semi-cylindrical winding needle 6 and the left diaphragm through the sheet feeding device. After completing one round of winding, the positive electrode sheet feeding device inserts the positive electrode ear between the two layers of diaphragms to complete the sheet feeding operation. The motor continues to work until the entire winding process is completed;

[0040] S3, diaphragm cutting and cleaning: after winding is completed, the motor stops to ensure that the groove 15 of the semi-cylindrical winding needle 6 is parallel to the cutting knife 9. At this time, the cylinder 11 at the tail of the cutting knife 9 is started to push the cutting knife 9 into the groove 15 of the two semi-cylindrical winding needles 6 to complete the diaphragm cutting. At the same time, the dust suction pipe 10 on the cutting knife 9 winding needle bracket starts to work to clean the diaphragm debris generated by cutting. After cutting is completed, the cylinder 11 retracts the cutting knife 9 to the initial position;

[0041] S4, diaphragm finishing and tape sticking: After the cutting is completed, the turret 1 driving device rotates it 60°, and moves the cylinder 3 from the top to the lower left. At this time, the diaphragm pressing roller is extended under the drive of the double-acting cylinder to press the diaphragm. At the same time, another double-acting cylinder drives the diaphragm cutter to extend and cut the diaphragm. Then, the motor starts to work and drives the winding needle sleeve 4 to rotate clockwise through the gear 2 13 to complete the finishing and winding of the cut diaphragm. At the same time, the glue sticking mechanism extends to stick the tape on the battery cell. In this process, the device in the cylinder 3 located at the top position repeats steps S1 to S3, and the device located at the lower left continues to perform the finishing operation of the diaphragm;

[0042] S5. Removal of the winding core and resetting of the device: As the turret 1 rotates 60° again, the material removal claw starts to work and clamps the battery cell. At this time, the air expansion shaft 7 is released, and the diameter of the semi-cylindrical winding needle 6 is reduced from 3.5mm to 3.4mm. The motor 2 is started again to drive the semi-cylindrical winding needle 6 to rotate, so that the cut diaphragm is close to the hole wall. The double-acting cylinder then drives the winding needle shaft 5 to retract, and the material removal claw takes out the winding core and places it in the tray. At the same time, the device located at the upper position repeats steps S1 to S3, and the device in the lower left cylinder 3 repeats the operation of step S4.

[0043] Specifically, in step S1, the turret 1 is used to position and the air expansion shaft 7 is used to expand the diameter of the winding needle, ensuring that the tension between the semi-cylindrical winding needle 6 and the diaphragm during winding can meet the winding requirements, ensuring the stability of the inner structure of the battery cell, thereby laying a stable foundation for the subsequent winding process and ensuring the smooth progress of subsequent processes; the rectangular protrusions 14 on the semi-circular arc winding needle shaft 5 are mutually embedded in the rectangular groove of the winding needle shaft sleeve 4, so that when the double-acting cylinder pushes the semi-circular arc winding needle shaft 5, the mechanism inside the semi-circular arc winding needle shaft 5 maintains synchronous movement; in step S2, the gear 2 13 on the outer wall of the winding needle shaft sleeve 4 is meshed with the motor, and at the same time, the rectangular protrusion 14 on the outer wall of the semi-circular arc winding needle shaft 5 is embedded in the rectangular groove of the inner wall of the winding needle shaft sleeve 4. When the winding needle shaft sleeve rotates, the winding needle is guaranteed to rotate synchronously, ensuring the stability of the winding process, and the winding is uniform and tight, avoiding looseness or misalignment, and ensuring the uniformity of the internal structure of the battery cell. Uniformity improves the quality and performance of the battery cell; in step S3, the precise operation of the cutting knife 9 brings about neat cutting of the diaphragm, and the dust suction pipe 10 effectively cleans up the debris after it is started. The effect of this step is clean cutting to prevent debris from affecting the performance of the battery cell. At the same time, the dust suction device ensures the cleanliness of the battery cell production environment; in step S5, the air expansion shaft 7 is loosened, and the diameter of the semi-cylindrical winding needle 6 is reduced from 3.5mm to 3.4mm. The motor is started again to drive the semi-cylindrical winding needle 6 to rotate, so that the cut diaphragm is close to the hole wall, the diameter of the winding needle is reduced, and the friction force on the winding needle when it is pulled out is greatly reduced, avoiding the problem of deformation of the inner structure of the battery cell when the needle is pulled out. At the same time, after the inner diaphragm is cut, it is rotated and fitted to the center hole wall by the winding needle, which solves the problem of deformation of the center hole of the battery cell caused by the rebound of the diaphragm, thereby avoiding the scrapping of the battery cell caused by the bottom needle entering the center hole due to the rebound of the diaphragm.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery cell winding device, characterized in that: It includes a winding device and a cutting mechanism; The winding device comprises a turret (1), which is mounted on the winding machine body through a vertical plate. A gear (2) is fixed on the circumferential outer wall of the turret (1), and the gear (2) is meshed with the motor gear. A plurality of cylinders (3) are arranged inside the turret (1), and a winding needle sleeve (4) is installed inside each of the cylinders (3). One end of the tail of the winding needle sleeve (4) is connected to a double-acting cylinder, which is used to drive the entire winding needle sleeve (4) and the internal mechanism to move forward and backward. The winding needle sleeve (4) is hollow and is equipped with two semi-circular winding needle shafts (5). A semi-cylindrical winding needle (6) is connected to the front side of each of the semi-circular winding needle shafts (5). The two semi-cylindrical winding needles (6) are combined into a cylindrical winding needle, and there is a gap between the two semi-cylinders. An air expansion shaft (7) is arranged between the two semi-circular winding needle shafts (5).

2. A battery core winding device according to claim 1, characterized in that: The cutting mechanism comprises a needle hole (8) and a cutting knife (9); a dust suction pipe (10) is fixed to the tail end of the cutting knife (9); a cylinder (11) is installed on the rear side of the dust suction pipe (10) for driving the cutting knife (9) to move forward and backward.

3. A battery core winding device according to claim 1, characterized in that: The cylinder (3) is provided with a rectangular hole (12), the turret (1) is provided with a driving motor through the rectangular hole (12), and the driving motor gear is meshed with a second gear (13) on the outer wall of the winding needle sleeve (4) through the rectangular hole (12).

4. A battery core winding device according to claim 1, characterized in that: The outer wall of the winding needle shaft sleeve (4) is provided with a second gear (13), and the second gear (13) on the outer wall of the winding needle shaft sleeve (4) is meshed with the motor gear.

5. The battery core winding device according to claim 1, characterized in that: The inner wall of the needle winding shaft sleeve (4) is provided with a plurality of rectangular grooves, and the outer wall of the semicircular needle winding shaft (5) is provided with a plurality of rectangular protrusions (14), and the rectangular protrusions (14) are embedded in the rectangular grooves of the inner wall of the needle winding shaft sleeve (4).

6. A battery core winding device according to claim 1, characterized in that: One end of the air expansion shaft (7) is connected to the compressed air pipe via a high-speed rotating joint.

7. A battery core winding device according to claim 1, characterized in that: A groove (15) is longitudinally provided inside the semi-cylindrical winding needle (6), and the groove (15) is perpendicular to the plane of the semi-cylindrical winding needle (6).

8. A method for winding a battery cell using a battery cell winding device, according to the battery cell winding device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Needle winding preparation and diaphragm positioning: When the turret (1) rotates so that the cylinder (3) is in the upper position, the air expansion shaft (7) starts to work, increasing the diameter of the two semi-arc needle winding shafts (5). Since the front end of the semi-arc needle winding shaft (5) is connected to the semi-cylindrical needle winding shaft (6), the diameter of the cylinder formed by the two semi-cylindrical needle winding shafts (6) increases from 3.4 mm to 3.5 mm after the air expansion shaft is inflated. The protrusion (14) on the needle winding shaft (5) moves relatively in the rectangular groove of the needle winding shaft sleeve (4), and the double-acting The cylinder is started at the same time, driving the semicircular needle winding shaft (5) to move forward. Since the semicircular needle winding shaft (5) is engaged with the winding shaft sleeve (4) through the protrusion (14), the needle winding shaft is driven to move forward until the front section of the semicircular needle winding shaft (5) contacts the front end of the cylinder (3). At this time, the winding needle (6) extends from the front end of the cylinder (3). At the same time, the diaphragm passes through the front section of the semi-cylindrical needle winding (6) and enters the middle of the two semi-cylindrical needle windings (6). The front section of the semi-cylindrical needle winding (6) penetrates into the needle winding hole (8), preparing for the next operation. S2. Winding of the diaphragm and the electrode sheet: Subsequently, the motor located outside the turret (1) cylinder (3) starts to start, and drives the winding needle shaft sleeve (4) to rotate clockwise through gear 2 (13). Since the winding needle shaft sleeve (4) is engaged with the semi-circular arc winding needle shaft (5) through the rectangular protrusion (14), the winding needle shaft (5) starts to rotate, driving the semi-cylindrical winding needle (6) to wind the diaphragm. At this time, the negative electrode sheet is inserted between the semi-cylindrical winding needle (6) and the left diaphragm through the sheet feeding device. After completing one round of winding, the positive electrode sheet feeding device inserts the positive electrode ear between the two layers of diaphragms to complete the sheet feeding operation. The motor continues to work until the entire winding process is completed; S3, diaphragm cutting and cleaning: after winding is completed, the motor stops to ensure that the groove (15) of the semi-cylindrical winding needle (6) is parallel to the cutting knife (9). At this time, the cylinder (11) at the tail of the cutting knife (9) starts to push the cutting knife (9) into the grooves (15) of the two semi-cylindrical winding needles (6) to complete the cutting of the diaphragm. At the same time, the dust suction pipe (10) on the cutting knife (9) winding needle bracket starts to work to clean the diaphragm debris generated by cutting. After cutting is completed, the cylinder (11) retracts the cutting knife (9) to the initial position; S4, diaphragm finishing and tape sticking: After the cutting is completed, the turret (1) driving device rotates it 60 degrees, and moves the cylinder (3) from the top to the lower left. At this time, the diaphragm pressing roller is extended under the drive of the double-acting cylinder to press the diaphragm. At the same time, another double-acting cylinder drives the diaphragm cutter to extend and cut the diaphragm. Then, the motor starts to work and drives the winding needle sleeve (4) to rotate clockwise through gear 2 (13) to complete the finishing and winding of the cut diaphragm. At the same time, the glue sticking mechanism extends to stick the tape on the battery cell. In this process, the device in the cylinder (3) located at the top position repeats steps S1 to S3, while the device located at the lower left continues to perform the diaphragm finishing operation; S5. Removal of the winding core and resetting of the device: As the turret (1) rotates 60° again, the material removal clamp starts to work and clamps the battery cell. At this time, the air expansion shaft (7) is released, and the diameter of the semi-cylindrical winding needle (6) is reduced from 3.5 mm to 3.4 mm. Motor 2 is started again to drive the semi-cylindrical winding needle (6) to rotate, so that the cut diaphragm is close to the hole wall. The double-acting cylinder then drives the winding needle shaft (5) to retract, and the material removal clamp removes the winding core and places it in the tray. At the same time, the device located at the upper position repeats steps S1 to S3, and the device in the lower left cylinder (3) repeats the operation of step S4.

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