Diaphragm cutting mechanism and winding machine

Abstract

The utility model relates to a diaphragm cutting mechanism and winding machine, including winding assembly and diaphragm cutting assembly, winding assembly includes roll needle, and the outside wall of roll needle is provided with the clamping groove, and the inner prong is movably arranged in the clamping groove, diaphragm cutting assembly sets up correspondingly winding position, and diaphragm cutting assembly includes upper diaphragm press roll, lower diaphragm press roll, cutter and outer prong, and cutter, outer prong movably set up between upper diaphragm press roll and lower diaphragm press roll, and outer prong sets up correspondingly inner prong, and cutter is located between outer prong and lower diaphragm press roll, and upper diaphragm press roll and lower diaphragm press roll cooperate with the outside wall of both sides of roll needle clamping groove to press diaphragm in the outside of roll needle, and cutter cuts diaphragm between upper diaphragm press roll and lower diaphragm press roll, and outer prong pushes the head of diaphragm after cutting into the clamping groove, and by inner prong, the head of diaphragm is clamped in the clamping groove. The diaphragm cutting assembly of the utility model can cut diaphragm quickly and push into roll needle, save traditional roll needle needle inserting time, and improve equipment efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a diaphragm cutting mechanism and a winding machine. Background Technology

[0002] Currently, in the winding manufacturing process of lithium-ion battery cells, the electrode insertion and separator cutting and clamping are key links affecting equipment efficiency and product quality. Specifically, when the winding equipment is performing the winding operation of bare cells, the bare cells on the winding station are moved to the adhesive application station. The empty winding needles on the winding station clamp the separator by inserting pins. Only after the winding needles clamp the separator can the electrode be cut by the cutter. The stroke of the winding needles pulling out the inserting pins is relatively long, which wastes time when the winding needles clamp the separator, thus affecting the overall winding time and the efficiency of the whole machine.

[0003] Furthermore, after the diaphragm is cut, vacuum adsorption is used to maintain the tension at the tail of the diaphragm. However, the vacuum adsorption force is small, and the diaphragm is prone to deflection or ribbon slippage under the tension, resulting in wrinkles in the diaphragm and reducing the production yield of the battery cell. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a diaphragm cutting mechanism and a winding machine.

[0005] In a first aspect, this utility model provides a diaphragm cutting mechanism, including a winding assembly and a diaphragm cutting assembly. The winding assembly includes a winding needle, and the outer wall of the winding needle is provided with a clamping groove for clamping the head of the diaphragm before pre-winding. An inner fork is movably disposed in the clamping groove. The diaphragm cutting assembly is disposed corresponding to the winding station. The diaphragm cutting assembly includes an upper diaphragm pressure roller, a lower diaphragm pressure roller, a cutter, and an outer fork. The cutter and the outer fork are movably disposed between the upper and lower diaphragm pressure rollers. The outer fork is disposed corresponding to the inner fork. The cutter is located between the outer fork and the lower diaphragm pressure roller. The upper and lower diaphragm pressure rollers cooperate with the outer walls on both sides of the clamping groove of the winding needle to press the diaphragm on the outside of the winding needle. The cutter cuts the diaphragm between the upper and lower diaphragm pressure rollers. The outer fork pushes the cut diaphragm head into the clamping groove, and the inner fork clamps the diaphragm head in the clamping groove.

[0006] In some embodiments, the outer fork is provided with a row of pushing teeth on the side facing the winding needle, and the inner fork is provided with a row of positioning teeth. When the outer fork pushes the diaphragm head into the clamping groove, the pushing teeth and positioning teeth interlock and engage, and the positioning teeth can move relative to the pushing teeth in the thickness direction to clamp the diaphragm head on the outer fork to the inner wall of the clamping groove.

[0007] In some embodiments, a clamping drive is provided in the clamping groove, and the clamping drive is driven to move the inner fork in the thickness direction.

[0008] In some embodiments, the diaphragm cutting assembly further includes a movable seat, on which the upper diaphragm pressure roller, lower diaphragm pressure roller, cutter, and outer fork are spaced apart. The movable seat is driven by a drive assembly to move the movable seat closer to or away from the winding station. The movable seat is equipped with a fork correction motor driven by the outer fork. The fork correction motor drives the outer fork to move in the length direction to adjust the relative position of the outer fork and the inner fork.

[0009] In some embodiments, an insert assembly that cooperates with the diaphragm cutting assembly is provided on the outside of the winding station. The winding needle cooperates with the insert assembly and the diaphragm cutting assembly at the winding station. The insert assembly feeds positive and negative electrode sheets to the winding station. The insert assembly includes a main drive roller and a correction roller. The main drive roller and the correction roller feed the positive or negative electrode sheets by means of roller clamping. The main drive roller has an integrally formed roller body.

[0010] In some embodiments, a residual roll assembly is also included outside the adhesive application station. The residual roll assembly cooperates with the diaphragm cutting assembly and the winding needle of the adhesive application station. The residual roll assembly includes a residual roll roller, which rolls on the outside of the winding needle of the adhesive application station. After the diaphragm cutting assembly cuts the diaphragm at the winding station, the residual roll roller cooperates with the winding needle of the adhesive application station to wind up the cut tail of the diaphragm onto the winding needle of the adhesive application station.

[0011] In some embodiments, the roll assembly further includes a roll pressure roller and a roll adsorption plate. The roll pressure roller, roll adsorption plate, and roll roller are disposed on a roll holder. The roll holder is driven by a roll drive component. The roll drive component drives the roll roller to move closer to or away from the winding needle at the adhesive application station. An intermediate pressure roller is disposed between the adhesive application station and the winding station. When the roll roller presses against the outside of the winding needle at the adhesive application station, the roll pressure roller presses the diaphragm between the winding station and the adhesive application station onto the intermediate pressure roller. The roll adsorption plate adsorbs the diaphragm between the intermediate pressure roller and the winding station through vacuum adsorption.

[0012] In some embodiments, the residual roll is mounted on the residual roll holder via a residual roll cylinder.

[0013] Secondly, this utility model also provides a winding machine, including the diaphragm cutting mechanism described in the first aspect.

[0014] Compared with the prior art, the advantages of this utility model are: 1. The main drive roller is machined as a whole, eliminating the one-way bearing. Both ends are supported by bushings with built-in bearings, which not only facilitates later maintenance and replacement, but also avoids the rotational clearance of the one-way bearing, improves the wafer feeding accuracy, and increases the production yield.

[0015] 2. After the winding station completes winding and is moved to the adhesive application station, the upper and lower diaphragm pressure rollers press the diaphragm onto the empty winding station needle. After the cutter extends to cut the diaphragm, the outer fork extends to push the diaphragm head flat inside the winding station needle. The inner fork of the winding station needle clamps the diaphragm, and the outer fork retracts to start winding. This saves the time of inserting the winding needle and improves equipment efficiency.

[0016] 3. The position of the outer shift fork is changed in real time by the shift fork correction motor, so that the positions of the outer shift fork and the inner shift fork are accurate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the planar structure of an embodiment of this application.

[0018] Figure 2 This is one of the three-dimensional structural schematic diagrams of the wafer insertion assembly in an embodiment of this application.

[0019] Figure 3 This is a second three-dimensional structural schematic diagram of the wafer insertion assembly according to an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the internal structure of the winding needle according to an embodiment of this application.

[0021] Figure 5 This is a three-dimensional structural schematic diagram of the diaphragm cutting assembly according to an embodiment of this application.

[0022] Figure 6 This is a three-dimensional structural diagram of the scrap assembly according to an embodiment of this application.

[0023] Attached labels: 101, winding station; 102, adhesive application station; 103, unloading station; 1. Winding assembly; 11. Winding needle; 12. Grip groove; 13. Inner shift fork; 14. Positioning teeth; 15. Film clamping drive; 16. Intermediate pressure roller; 2. Diaphragm cutting assembly; 21. Upper diaphragm pressure roller; 22. Lower diaphragm pressure roller; 23. Cutter; 24. Outer shift fork; 25. Film pushing teeth; 26. Moving seat; 27. Drive assembly; 28. Shift fork correction motor; 3. Residual roll assembly; 31. Residual roll roller; 32. Residual roll pressure roller; 33. Residual roll adsorption plate; 34. Residual roll seat; 35. Residual roll drive component; 36. Residual roll cylinder; 4. Infeed assembly; 41. Main drive roller; 42. Correcting roller; 43. Infeed holder; 44. Bushing; 45. Electrode guide plate; 46. Sensor detection assembly; 5. CCD detection component. Detailed Implementation

[0024] The specific embodiments of this utility model are described with reference to the accompanying drawings.

[0025] refer to Figures 1 to 6 A diaphragm cutting mechanism includes a winding assembly 1, a diaphragm cutting assembly 2, and a residual roll assembly 3. The winding assembly 1 includes a winding needle 11, and the outer wall of the winding needle 11 is provided with a clamping groove 12 for clamping the head of the diaphragm before pre-winding. An inner fork 13 is movably disposed in the clamping groove 12. The diaphragm cutting assembly 2 is disposed corresponding to the winding station 101 and cooperates with the winding needle 11 of the winding station 101. The residual roll assembly 3 is disposed outside the adhesive application station 102 and cooperates with the diaphragm cutting assembly 2 and the winding needle 11 of the adhesive application station 102. The residual roll assembly 3 includes a residual roll roller 31. The diaphragm cutting assembly 2 includes an upper diaphragm pressure roller 21, a lower diaphragm pressure roller 22, a cutter 23, and an outer fork 24. The cutter 23 and the outer fork 24 are movably disposed on... Between the upper diaphragm pressure roller 21 and the lower diaphragm pressure roller 22, an outer fork 24 is set corresponding to an inner fork 13. A cutter 23 is located between the outer fork 24 and the lower diaphragm pressure roller 22. The upper diaphragm pressure roller 21 and the lower diaphragm pressure roller 22 cooperate with the outer side walls of the clamping groove 12 on both sides of the winding needle 11 to press the diaphragm on the outside of the winding needle 11. The residual roll roller 31 rolls on the outside of the winding needle 11 of the adhesive application station 102. The cutter 23 cuts the diaphragm between the upper diaphragm pressure roller 21 and the lower diaphragm pressure roller 22. The outer fork 24 pushes the cut diaphragm head into the clamping groove 12, and the inner fork 13 clamps the diaphragm head in the clamping groove 12. The residual roll roller 31 cooperates with the winding needle 11 of the adhesive application station 102 to wind the cut diaphragm tail onto the winding needle 11 of the adhesive application station 102.

[0026] Understandably, by setting the upper diaphragm pressure roller 21 and the lower diaphragm pressure roller 22 to press the diaphragm onto the surface of the empty winding needle 11 in the winding station 101, and then cutting the diaphragm with the cutter 23, the outer fork 24 and the inner fork 13 work together to feed the diaphragm head into and clamp it in the clamping groove 12 of the winding needle 11. This quickly completes the actions of pressing, cutting, and clamping the diaphragm head, eliminating the waiting time of the traditional winding machine's "clamping before cutting", effectively shortening the winding cycle and improving the overall machine efficiency.

[0027] In this embodiment, reference Figure 1 , Figure 4 and Figure 5The outer fork 24 has a row of pushing teeth 25 on the side facing the winding needle 11, and the inner fork 13 has a row of positioning teeth 14. When the outer fork 24 pushes the diaphragm head into the clamping groove 12, the pushing teeth 25 and the positioning teeth 14 interlock and engage, and the positioning teeth 14 can move relative to the pushing teeth 25 in the thickness direction to clamp the diaphragm head on the outer fork 24 to the inner wall of the clamping groove 12. A clamping drive 15 is provided in the clamping groove 12, and the clamping drive 15 is driven to the inner fork 13 to drive the inner fork 13 to move in the thickness direction.

[0028] It is understandable that the outer fork 24 with pusher teeth 25 and the inner fork 13 with positioning teeth 14 are staggered. When the outer fork 24 pushes the diaphragm head into the clamping groove 12, it ensures that the diaphragm is pushed into the clamping groove 12 accurately and flatly, so that the diaphragm feeding is accurate and avoids diaphragm skewing.

[0029] In this embodiment, reference Figure 1 , Figure 4 and Figure 5 The diaphragm cutting assembly 2 also includes a movable seat 26. The upper diaphragm pressure roller 21, the lower diaphragm pressure roller 22, the cutter 23 and the outer fork 24 are spaced apart on the movable seat 26. The movable seat 26 is driven by a drive assembly 27 to move the movable seat 26 closer to or away from the winding station 101. The movable seat 26 is provided with a fork correction motor 28 that is driven by the outer fork 24. The fork correction motor 28 drives the outer fork 24 to move in the length direction to adjust the relative position of the outer fork 24 and the inner fork 13.

[0030] Understandably, the shift fork correction motor 28 can automatically fine-tune the relative positions of the outer shift fork 24 and the inner shift fork 13 to adapt to different working conditions and compensate for assembly errors, ensuring that the outer shift fork 24 and the inner shift fork 13 can be accurately positioned, so that the winding operation can be stable, while avoiding collision damage between the outer shift fork 24 and the inner shift fork 13.

[0031] In this embodiment, reference Figures 1 to 3 An insert assembly 4 that cooperates with the diaphragm cutting assembly 2 is provided on the outside of the winding station 101. The winding needle 11 cooperates with the insert assembly 4 and the diaphragm cutting assembly 2 at the winding station 101. The insert assembly 4 feeds positive and negative electrode sheets to the winding station 101. The insert assembly 4 includes a main drive roller 41 and a correction roller 42. The main drive roller 41 and the correction roller 42 feed positive or negative electrode sheets by means of roller clamping. The main drive roller 41 has an integrally formed roller body.

[0032] Understandably, the wafer insertion assembly 4 adopts an integrally molded main drive roller 41. The main drive roller 41 is connected to the wafer insertion seat 43 through a bushing 44 with a built-in bearing, which replaces the one-way bearing structure with rotational clearance. This fundamentally eliminates the electrode positioning error caused by transmission clearance, ensures the accuracy and stability of electrode delivery, improves the alignment accuracy between the electrode and the separator, and thus ensures the consistency of the battery cell products.

[0033] In this embodiment, reference Figure 1 and Figure 6 The residual roll assembly 3 also includes a residual roll pressure roller 32 and a residual roll adsorption plate 33. The residual roll pressure roller 32, the residual roll adsorption plate 33, and the residual roll roller 31 are disposed on the residual roll seat 34. The residual roll seat 34 is connected to a residual roll drive component 35. The residual roll drive component 35 drives the residual roll roller 31 to approach or move away from the winding needle 11 of the adhesive application station 102. An intermediate pressure roller 16 is disposed between the adhesive application station 102 and the winding station 101. When the residual roll roller 31 presses on the outside of the winding needle 11 of the adhesive application station 102, the residual roll pressure roller 32 presses the diaphragm between the winding station 101 and the adhesive application station 102 onto the intermediate pressure roller 16. The residual roll adsorption plate 33 adsorbs the diaphragm between the intermediate pressure roller 16 and the winding station 101 through vacuum adsorption. The residual roll roller 31 is mounted on the residual roll seat 34 through a residual roll cylinder 36.

[0034] Understandably, the residual roll adsorption plate 33 of the residual roll assembly 3 can adsorb the tail of the diaphragm through vacuum adsorption, and the residual roll pressure roller 32 presses the diaphragm on the intermediate pressure roller 16 to prevent the tail of the diaphragm from wrinkling due to tension, thereby improving the yield of the battery cell.

[0035] refer to Figures 1 to 6 This application also provides a winding machine, including the diaphragm cutting mechanism described above.

[0036] The specific working principle of the winding machine is as follows: While waiting for the empty winding needle 11 to be moved to the winding station 101, the main drive roller 41 and the correction pressure roller of the feeding assembly 4 hold the positive and negative electrode sheets. The main drive roller 41 feeds the electrode sheets onto the winding needle 11 at the winding station 101. The electrode guide plate 45 extends and the air blowing guide is activated, thereby guiding the electrode sheets onto the winding needle 11. The electrode sheets are pre-wound synchronously with the winding needle 11 at the winding station 101. During the winding process, the position of the electrode sheets is detected in real time by the internal and external sensor detection assembly 46, and the correction pressure roller continuously corrects the electrode sheets in a closed loop. Among them, after the cell winding is completed and before the electrode sheets are cut, the electrode sheet guide cylinder extends and uses vacuum adsorption to provide tension to the electrode sheets, ensuring the alignment of the electrode sheet tail.

[0037] After the battery cell winding is completed, the winding needle 11 on the winding station 101 is moved to the adhesive application station 102. The diaphragm follows to the adhesive application station 102. During the repositioning process, the upper diaphragm pressure roller 21 and the lower diaphragm pressure roller 22 will move forward to the adhesive application station 102. After the winding needle 11 completes the repositioning, the upper diaphragm pressure roller 21 and the lower diaphragm pressure roller 22 will quickly press the diaphragm onto the empty winding needle 11 in the adhesive application station 102. The cutter 23 quickly extends to cut the diaphragm, and the outer fork 24 extends to push the diaphragm head into the clamping groove 12 of the winding needle 11. The inner fork 13 inside the winding needle 11 clamps the diaphragm head, and the outer fork 24 retracts into the clamping groove 12. The winding needle 11 in the winding station 101 can then begin winding. The relative positions of the outer fork 24 and the inner fork 13 of the coil needle 11 must be precise. When the inner circumference of the coil needle 11 changes, the position of the inner fork 13 inside the coil needle 11 will change accordingly. The position of the outer fork 24 is changed in real time by the fork correction motor 28 to ensure that the outer fork 24 can always match the inner fork 13, so that the inner fork 13 can accurately clamp the diaphragm head.

[0038] After the winding needle 11 of the winding station 101 is moved to the adhesive application station 102, the residual roll roller 31 extends and presses the bare battery cell on the adhesive application station 102. The residual roll pressure roller 32 and the intermediate pressure roller 16 clamp the diaphragm. The residual roll adsorption plate 33 opens the vacuum adsorption diaphragm. After the cutter 23 cuts the diaphragm, the winding needle 11 of the adhesive application station 102 winds up the tail of the diaphragm. The residual roll pressure roller 32 and the residual roll adsorption plate 33 provide tension to the tail of the diaphragm to ensure that the tail of the diaphragm is aligned.

[0039] To improve control accuracy, a CCD detection component 5 is installed on one side of the winding station 101 and the unloading station 103. The CCD detection component 5 can detect the winding process in real time. At the same time, for cells with different winding diameters, the CCD detection component 5 can change the camera position in real time through servo drive to ensure that the camera focal length remains unchanged and the shooting stability is maintained.

[0040] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A diaphragm cutting mechanism, characterized in that, It includes a winding assembly and a diaphragm cutting assembly. The winding assembly includes a winding needle, and the outer wall of the winding needle is provided with a clamping groove for clamping the head of the diaphragm before pre-winding. An inner fork is movably disposed in the clamping groove. The diaphragm cutting assembly is set corresponding to the winding station. The diaphragm cutting assembly includes an upper diaphragm pressure roller, a lower diaphragm pressure roller, a cutter, and an outer fork. The cutter and the outer fork are movably disposed between the upper and lower diaphragm pressure rollers. The outer fork is disposed corresponding to the inner fork. The cutter is located between the outer fork and the lower diaphragm pressure roller. The upper and lower diaphragm pressure rollers cooperate with the outer side walls on both sides of the winding needle clamping groove to press the diaphragm on the outside of the winding needle. The cutter cuts the diaphragm between the upper and lower diaphragm pressure rollers. The outer fork pushes the cut diaphragm head into the clamping groove, and the inner fork clamps the diaphragm head in the clamping groove.

2. The diaphragm cutting mechanism according to claim 1, characterized in that, The outer fork has a row of pushing teeth on the side facing the winding needle, and the inner fork has a row of positioning teeth. When the outer fork pushes the diaphragm head into the clamping groove, the pushing teeth and positioning teeth interlock and engage, and the positioning teeth can move relative to the pushing teeth in the thickness direction to clamp the diaphragm head on the outer fork to the inner wall of the clamping groove.

3. The diaphragm cutting mechanism according to claim 2, characterized in that, A film clamping drive is provided in the clamping groove. The film clamping drive is connected to the inner shift fork drive to drive the inner shift fork to move in the thickness direction.

4. The diaphragm cutting mechanism according to claim 2, characterized in that, The diaphragm cutting assembly also includes a movable seat. The upper diaphragm pressure roller, the lower diaphragm pressure roller, the cutter, and the outer shift fork are spaced apart on the movable seat. The movable seat is driven by a drive assembly to move the movable seat closer to or away from the winding station. The movable seat is equipped with a shift fork correction motor that is driven by the outer shift fork. The shift fork correction motor drives the outer shift fork to move in the length direction to adjust the relative position of the outer shift fork and the inner shift fork.

5. The diaphragm cutting mechanism according to claim 1, characterized in that, An infeed assembly that cooperates with the diaphragm cutting assembly is provided on the outside of the winding station. The winding needle cooperates with the infeed assembly and the diaphragm cutting assembly at the winding station. The infeed assembly feeds positive and negative electrode sheets to the winding station. The infeed assembly includes a main drive roller and a correction roller. The main drive roller and the correction roller feed positive or negative electrode sheets by means of roller clamping. The main drive roller has an integrally formed roller body.

6. The diaphragm cutting mechanism according to claim 1, characterized in that, It also includes a residual roll assembly disposed outside the adhesive application station. The residual roll assembly cooperates with the diaphragm cutting assembly and the winding needle of the adhesive application station. The residual roll assembly includes a residual roll roller, which rolls on the outside of the winding needle of the adhesive application station. After the diaphragm cutting assembly cuts the diaphragm at the winding station, the residual roll roller cooperates with the winding needle of the adhesive application station to wind up the cut tail of the diaphragm onto the winding needle of the adhesive application station.

7. The diaphragm cutting mechanism according to claim 6, characterized in that, The residual roll assembly also includes a residual roll pressure roller and a residual roll adsorption plate. The residual roll pressure roller, residual roll adsorption plate, and residual roll roller are disposed on a residual roll seat. The residual roll seat is driven by a residual roll driving component. The residual roll driving component drives the residual roll roller to move closer to or away from the winding needle at the adhesive application station. An intermediate pressure roller is disposed between the adhesive application station and the winding station. When the residual roll roller presses against the outside of the winding needle at the adhesive application station, the residual roll pressure roller presses the diaphragm between the winding station and the adhesive application station onto the intermediate pressure roller. The residual roll adsorption plate adsorbs the diaphragm between the intermediate pressure roller and the winding station through vacuum adsorption.

8. The diaphragm cutting mechanism according to claim 7, characterized in that, The residual roll is mounted on the residual roll holder via a residual roll cylinder.

9. A winding machine, characterized in that, Includes the diaphragm cutting mechanism according to any one of claims 1 to 8.

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