Tab cutting device for lithium battery manufacturing and operating method

Abstract

The application discloses a lithium battery manufacturing tab cutting-off processing device and an operating method, belonging to the technical field of lithium battery manufacturing technology, which comprises a conveying frame, one side of the conveying frame is provided with a fixing frame, the bottom of the fixing frame is fixedly connected with a supporting plate, the top of the supporting plate is fixedly connected with a bottom plate, the side wall of the bottom plate is fixedly connected with a side baffle, the top of the fixing frame is fixedly connected with a hydraulic assembly, the output shaft of the hydraulic assembly is provided with a pressing plate, the pressing plate is provided with a cutter plate, and the pressing plate is provided with a polishing mechanism. The polishing mechanism is adopted to directly polish the tab cutting position through the polishing mechanism after cutting-off processing, burrs can be directly removed, the electrode sheet does not need to be repositioned and polished after cutting-off, and the cutting-off efficiency of the electrode sheet tab can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing technology, specifically to a device and method for cutting off tabs in lithium battery manufacturing. Background Technology

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use require very strict environmental conditions. With the development of science and technology, lithium batteries have become mainstream. Lithium batteries can be broadly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain metallic lithium and are rechargeable.

[0003] In the manufacturing of lithium batteries, especially large lithium battery packs, electrode sheets are needed to connect the electrodes of multiple lithium batteries. For the tab part of the electrode sheet, it is necessary to cut to leave the shape of the tab. Existing tab cutting equipment directly positions the electrode sheet and then cuts it. Since the electrode sheet is a metal product, burrs will be generated on the tab after cutting. The tab needs to be polished after cutting to remove the burrs. Thus, the tab needs to be repositioned and polished again after cutting. The processing steps are cumbersome and the tab cannot be polished immediately after cutting.

[0004] Based on this, the present invention designs a device and operating method for cutting electrode tabs for lithium battery manufacturing, so as to solve the problem that the electrode tabs need to be polished after being cut, which is a complicated process. Summary of the Invention

[0005] The purpose of this invention is to provide a tab cutting and processing device and operating method for lithium battery manufacturing, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tab cutting processing device for lithium battery manufacturing, comprising a conveyor frame, a fixed frame provided on one side of the conveyor frame, a support plate fixedly connected to the bottom of the fixed frame, a base plate fixedly connected to the top of the support plate, a side baffle fixedly connected to the side wall of the base plate, a hydraulic component fixedly connected to the top of the fixed frame, a pressure plate provided on the output shaft of the hydraulic component, a cutting blade provided on the pressure plate, and a grinding and polishing mechanism provided on the pressure plate. The grinding and polishing mechanism is used to remove chamfers and grind the cut area of ​​the tab after it is cut by the cutting blade.

[0007] As a further embodiment of the present invention, the grinding and polishing mechanism includes a fixed frame, which is fixed to the top of the pressure plate. A connecting rod is slidably connected inside the fixed frame. The output shaft of the hydraulic component passes through the fixed frame and is fixedly connected to the connecting rod. A connecting frame is fixedly connected to one end of the connecting rod. The cutting plate is fixed to the bottom outer wall of the connecting frame. A second fixed seat is fixedly connected to the side wall of the pressure plate. The second fixed seat is slidably sleeved inside the connecting frame. An upper support frame is provided at the bottom of the second fixed seat. The upper support frame is fixedly connected to the side wall of the pressure plate. A sliding groove is provided inside the second fixed seat. A docking frame is slidably connected inside the sliding groove. The cutting plate... A push rod for pushing the docking frame is fixedly connected to the outer wall. One end of the docking frame passes through the second fixed seat and is located outside the second fixed seat. Several transmission plates are provided at the bottom of the second fixed seat. Rotating plates are rotatably connected to the side walls of the transmission plates. The tops of the rotating plates are rotatably connected to the bottom of the docking frame. A reset spring for resetting the docking frame is provided inside the upper support frame. Several upper frosted plates corresponding to the transmission plates are provided at the bottom of the upper support frame. A transmission rod is fixedly connected to the top of the upper frosted plate. The top of the transmission rod is fixedly connected to the transmission plate. Several slots for sliding of the transmission rod are opened on the upper support frame.

[0008] As a further embodiment of the present invention, a driving cylinder is fixedly connected to the bottom of the fixed frame, a connecting plate is fixedly connected to the output end of the driving cylinder, a plurality of side alignment plates are fixedly connected to the side wall of the connecting plate, a lower support frame is fixedly connected to the side wall of the connecting plate, a lower frosted plate corresponding to the upper frosted plate is slidably arranged on the top of the lower support frame, a first fixed seat is fixedly connected to the side wall of the connecting plate, and a docking frame is slidably connected inside the first fixed seat.

[0009] As a further embodiment of the present invention, a fixed base is fixedly connected to the bottom end of the fixed frame, and a collection frame is fixedly connected to the top end of the fixed base.

[0010] As a further embodiment of the present invention, a pull-out drawer is slidably connected inside the collection frame, and the outer wall of the pull-out drawer can be completely fitted with the inner wall of the collection frame.

[0011] As a further embodiment of the present invention, the connecting frame is provided with openings for the transmission plate and the upper frosted plate to extend outward respectively.

[0012] As a further embodiment of the present invention, the cutting plate can be completely fitted to the outer wall of the upper support frame, the outer wall of the upper support frame is a smooth wall, and the connecting plate can be completely fitted and connected to the lower support frame.

[0013] A method for cutting off tabs in lithium battery manufacturing, the method comprising the following steps:

[0014] Step 1: Place the electrode piece whose tab needs to be cut on the conveyor rack for transport;

[0015] Step 2: The electrode sheet is transported to the top of the base plate via the conveyor frame and its displacement is restricted by contact with the side baffle.

[0016] Step 3: The hydraulic assembly drives the fixing frame to slide down until the electrode sheet is pressed tightly, and then the electrode tab is cut off by the cutting blade.

[0017] Step 4: After the tab is cut, the grinding and polishing mechanism polishes the cut area of ​​the tab to remove burrs.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention employs a grinding and polishing mechanism to push a cutting plate downwards to cut the electrode tab, removing excess material from the tab. After cutting, the grinding and polishing mechanism polishes the tab surface, removing burrs and smoothing it. Then, a hydraulic assembly drives a pressure plate to rise, removing the polished electrode from the base plate. The electrode continues to be transported via a conveyor for further cutting. After cutting, the cutting area of ​​the tab is directly polished by the grinding and polishing mechanism, directly removing burrs. This eliminates the need for a re-alignment and grinding process after cutting, effectively improving the cutting efficiency of the electrode tab. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 A schematic diagram of the structure of the fixed frame, side baffles, base plate and support plate;

[0022] Figure 3 A schematic diagram of the structure of the collection box, the pull-out drawer, and the fixed base;

[0023] Figure 4 A schematic diagram of the structure of the fixed frame, side alignment plate, connecting plate and drive cylinder;

[0024] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0025] Figure 6 This is a schematic diagram of the grinding and polishing mechanism.

[0026] Figure 7 for Figure 6 Enlarged structural diagram at point B;

[0027] Figure 8 A schematic diagram of the grinding and polishing mechanism (section view of the second fixed seat and the upper support frame);

[0028] Figure 9 for Figure 8 Enlarged structural diagram at point C;

[0029] Figure 10 This is a flowchart of the method of the present invention.

[0030] The components represented by each number in the attached diagram are listed below: 1. Fixing frame; 2. Hydraulic assembly; 3. Fixing frame; 4. Conveying frame; 5. Side baffle; 6. Base plate; 7. Support plate; 8. Side alignment plate; 9. Connecting plate; 10. Drive cylinder; 11. Groove; 12. Lower support frame; 13. Docking frame; 14. First fixing seat; 15. Lower frosted plate; 16. Connecting rod; 17. Connecting frame; 18. Second fixing seat; 19. Cutting plate; 20. Upper support frame; 21. Pressure plate; 22. Slide groove; 23. Rotating plate; 24. Transmission plate; 25. Upper frosted plate; 26. Transmission rod; 27. Return spring; 28. Push rod; 111. Collection frame; 112. Pull-out drawer; 113. Fixing base. Detailed Implementation

[0031] Please see Figure 1-10 This invention provides a technical solution: a tab cutting device for lithium battery manufacturing, including a conveyor frame 4, a fixed frame 1 on one side of the conveyor frame 4, a support plate 7 fixedly connected to the bottom of the fixed frame 1, a base plate 6 fixedly connected to the top of the support plate 7, a side baffle 5 fixedly connected to the side wall of the base plate 6, a hydraulic component 2 fixedly connected to the top of the fixed frame 1, a pressure plate 21 on the output shaft of the hydraulic component 2, a cutting blade 19 on the pressure plate 21, and a grinding and polishing mechanism on the pressure plate 21. The grinding and polishing mechanism is used to remove chamfers and grind the cut area of ​​the tab after it is cut by the cutting blade 19.

[0032] When the above solution is put into practical use, the electrode sheet that needs to be cut is placed on the conveyor frame 4 for transportation. The electrode sheet is transported to the top plate 6 via the conveyor frame 4 and stops sliding under the restriction of the side baffle 5. The hydraulic component 2 is activated to push the top pressure plate 21 down to fix the electrode sheet on the bottom plate 6. The hydraulic component 2 continues to push the cutting plate 19 down to cut the electrode sheet at the tab, removing the excess part on the tab. After cutting, the grinding and polishing mechanism grinds the surface of the tab, removing the burrs and smoothing it. Then, the hydraulic component 2 drives the pressure plate 21 to rise and remove the polished electrode sheet from the bottom plate 6. The electrode sheet is then transported through the conveyor frame 4 for cutting. The advantage of this is that after cutting, the cutting area of ​​the tab can be directly ground by the grinding and polishing mechanism, which can directly remove burrs. There is no need to re-align and grind the electrode sheet after cutting, which can effectively improve the cutting efficiency of the electrode sheet tab.

[0033] As a further embodiment of the present invention, the grinding and polishing mechanism includes a fixed frame 3, which is fixed to the top of the pressure plate 21. A connecting rod 16 is slidably connected inside the fixed frame 3. The output shaft of the hydraulic component 2 passes through the fixed frame 3 and is fixedly connected to the connecting rod 16. A connecting frame 17 is fixedly connected to one end of the connecting rod 16. The cutting plate 19 is fixed to the bottom outer wall of the connecting frame 17. A second fixed seat 18 is fixedly connected to the side wall of the pressure plate 21. The second fixed seat 18 is slidably sleeved inside the connecting frame 17. An upper support frame 20 is provided at the bottom of the second fixed seat 18. The upper support frame 20 is fixedly connected to the side wall of the pressure plate 21. A sliding groove 22 is provided inside the second fixed seat 18. A docking frame 13 is slidably connected inside the sliding groove 22. A pushing rod 28 for pushing the docking frame 13 is fixedly connected to the outer wall of the cutting plate 19. One end of the docking frame 13 passes through the second fixed seat 18 and is located outside the second fixed seat 18. A plurality of transmission plates 24 are provided at the bottom of the second fixed seat 18. Rotating plates 23 are rotatably connected to the side walls of the moving plate 24. The tops of the rotating plates 23 are rotatably connected to the bottom of the docking frame 13. A return spring 27 for resetting the docking frame 13 is provided inside the upper support frame 20. Several upper frosted plates 25 corresponding to the transmission plate 24 are provided at the bottom of the upper support frame 20. A transmission rod 26 is fixedly connected to the top of the upper frosted plate 25. The top of the transmission rod 26 is fixedly connected to the transmission plate 24. Several transmission rods are provided on the upper support frame 20. The rod 26 has a sliding slot 11. A drive cylinder 10 is fixedly connected to the bottom of the fixed frame 1. A connecting plate 9 is fixedly connected to the output end of the drive cylinder 10. Several side alignment plates 8 are fixedly connected to the side wall of the connecting plate 9. A lower support frame 12 is fixedly connected to the side wall of the connecting plate 9. A lower frosted plate 15 corresponding to the upper frosted plate 25 is slidably arranged on the top of the lower support frame 12. A first fixed seat 14 is fixedly connected to the side wall of the connecting plate 9. A docking frame 13 is slidably connected inside the first fixed seat 14.

[0034] When the above scheme is put into actual use, after the electrode sheet is transported to the top of the base plate 6, the drive cylinder 10 is activated to push the connecting plate 9 up to contact the bottom surface of the base plate 6. During this process, the side alignment plate 8 on the side wall of the connecting plate 9 will contact the side wall of the electrode sheet and limit the electrode sheet, pushing the electrode sheet to the predetermined cutting position. Then, the hydraulic component 2 lowers the fixing frame 3. Under the weight of the fixing frame 3 itself, the pressure plate 21 will press down on the upper end of the electrode sheet to position the electrode sheet. At this time, the electrode tab of the electrode sheet is located between the lower frosting plate 15 and the upper frosting plate 25. After the pressure plate 21 presses the electrode sheet, the hydraulic component 2 continues to output, causing the connecting rod 16 to be pushed down. The connecting rod 16 drives the connecting frame 1. 7. As the connecting frame 17 slides down, the bottom cutting plate 19 cuts off the electrode tabs, removing the excess part of the tabs. Then, the connecting frame 17 continues to slide down, causing the push rod 28 on the cutting plate 19 to contact the docking frame 13 on the second fixed seat 18. This pushes the docking frame 13 to compress the return spring 27 and slide it towards the bottom of the slide groove 22. The docking frame 13 drives the rotating plate 23 to flip, causing the transmission plate 24 to be pushed outward by the rotating plate 23. The transmission plate 24 drives the upper grinding plate 25 to slide outward through the transmission rod 26. Since the upper grinding plate 25 is located above the tabs, the outward sliding upper grinding plate 25 can rub the surface of the tabs, thereby cleaning the burrs on the upper end face of the tabs.

[0035] As the upper frosting plate 25 extends outward, the push rod 28 continues to slide down, causing its bottom to contact the docking frame 13 inside the first fixed seat 14. In the same way, the lower frosting plate 15 on the upper surface of the lower support frame 12 slides outward, and the lower frosting plate 15 contacts the lower end surface of the electrode tab. The lower end surface of the electrode tab is polished by sliding, so that the upper and lower end surfaces of the electrode tab are polished simultaneously by the lower frosting plate 15 and the upper frosting plate 25, thereby achieving the polishing treatment of the electrode tab. Then, the hydraulic component 2 pulls the pressure plate 21 upward to reset, so that the docking frame 13 is released from the pressure of the push rod 28. Under the elastic force of the reset spring 27, the docking frame 13 is driven to reset, so that the upper frosting plate 25 and the lower frosting plate 15 are reset through transmission. Then, the above actions can be repeated to cut the electrode tab.

[0036] As a further embodiment of the present invention, a fixed base 113 is fixedly connected to the bottom end of the fixed frame 1, and a collection frame 111 is fixedly connected to the top end of the fixed base 113.

[0037] When the above solution is put into practical use, after the tab is cut, there will be an excess part cut off from the electrode plate. The collection frame 111 can collect the excess part and process it centrally to prevent the cut part from scattering.

[0038] As a further embodiment of the present invention, a pull-out drawer 112 is slidably connected inside the collection frame 111, and the outer wall of the pull-out drawer 112 can be completely fitted with the inner wall of the collection frame 111.

[0039] When the above solution is put into actual use, the part of the electrode that is cut off enters the collection box 111 and falls into the pull-out drawer 112. It is collected by the pull-out drawer 112. After a large amount of debris is collected, the pull-out drawer 112 can be pulled out from the collection box 111 for cleaning. After cleaning, the pull-out drawer 112 can be put back into the collection box 111 for reuse.

[0040] As a further embodiment of the present invention, the connecting frame 17 is provided with openings for the transmission plate 24 and the upper frosted plate 25 to extend outward respectively;

[0041] When the above solution is put into actual use, the connecting frame 17 will obstruct the outward sliding of the transmission plate 24 and the upper frosted plate 25. By opening an opening in the connecting frame 17, the transmission plate 24 and the upper frosted plate 25 can extend outward through the opening, so that the connecting frame 17 will not cause obstruction.

[0042] As a further embodiment of the present invention, the cutting plate 19 can be completely fitted to the outer wall of the upper support frame 20, the outer wall of the upper support frame 20 is a smooth wall, and the connecting plate 9 can be completely fitted and connected to the lower support frame 12.

[0043] When the above solution is put into practical use, the cutting plate 19, when fully fitted together, can accurately cut the excess part on the electrode tab when it slides down to cut, ensuring cutting accuracy.

[0044] A method for cutting off tabs in lithium battery manufacturing, the method comprising the following steps:

[0045] Step 1: Place the electrode piece whose tab needs to be cut on the conveyor frame 4 for conveying;

[0046] Step 2: The electrode sheet is transported to the top of the base plate 6 via the conveyor frame 4 and its displacement is restricted by contact with the side baffle 5;

[0047] Step 3: The hydraulic component 2 drives the fixing frame 3 to slide down until the electrode sheet is pressed tightly, and then the electrode tab is cut off by the cutter plate 19;

[0048] Step 4: After the tab is cut, the grinding and polishing mechanism polishes the cut area of ​​the tab to remove burrs.

[0049] Working principle: The electrode sheet to be cut is placed on the conveyor frame 4 for transport. The electrode sheet is transported above the base plate 6 via the conveyor frame 4. After the electrode sheet is transported above the base plate 6, the drive cylinder 10 is activated to push the connecting plate 9 upwards until it contacts the bottom surface of the base plate 6. During this process, the side alignment plate 8 on the side wall of the connecting plate 9 contacts the side wall of the electrode sheet and limits its movement, pushing the electrode sheet to the predetermined cutting position. Then, the hydraulic component 2 lowers the fixing frame 3. Under the weight of the fixing frame 3 itself, the pressure plate 21 presses down on the upper end of the electrode sheet to position it. The electrode tabs are located between the lower frosted plate 15 and the upper frosted plate 25. After the pressure plate 21 presses the electrode tabs, the hydraulic component 2 continuously outputs power, causing the connecting rod 16 to slide down. The connecting rod 16 drives the connecting frame 17 to slide down. The connecting frame 17 cuts off the electrode tabs through the bottom cutter plate 19, removing the excess part of the tabs. Then, the connecting frame 17 continues to slide down, causing the push rod 28 on the cutter plate 19 to contact the docking frame 13 on the second fixed seat 18, pushing the docking frame 13 to compress the return spring 27 and slide towards the bottom of the slide groove 22. The rotating plate 23 is rotated, causing the transmission plate 24 to be pushed outward by the rotating plate 23. The transmission plate 24 drives the upper abrasive plate 25 to slide outward through the transmission rod 26. Since the upper abrasive plate 25 is located above the electrode tab, the outward sliding upper abrasive plate 25 can rub against the surface of the electrode tab, thereby cleaning the burrs on the upper end surface of the electrode tab. As the upper abrasive plate 25 extends outward, the push rod 28 continues to slide down, causing its bottom to contact the docking frame 13 inside the first fixed seat 14. In the same way, the lower abrasive plate 15 on the upper end surface of the lower support frame 12 slides outward. The lower grinding plate 15 contacts the lower end face of the electrode tab and grinds the lower end face of the electrode tab by sliding. Thus, the lower grinding plate 15 and the upper grinding plate 25 grind the upper and lower end faces of the electrode tab cleanly at the same time, thereby achieving the grinding treatment of the electrode tab. Then, the hydraulic component 2 pulls the pressure plate 21 upward to reset, so that the docking frame 13 is released from the pressure of the push rod 28. Under the elastic force of the reset spring 27, the docking frame 13 is driven to reset, so that the upper grinding plate 25 and the lower grinding plate 15 are reset through transmission. Then, the above actions can be repeated to cut the electrode tab.

Claims

1. A tab cutting device for lithium battery manufacturing, comprising a conveyor frame (4), a fixed frame (1) provided on one side of the conveyor frame (4), a support plate (7) fixedly connected to the bottom of the fixed frame (1), a bottom plate (6) fixedly connected to the top of the support plate (7), a side baffle (5) fixedly connected to the side wall of the bottom plate (6), a hydraulic assembly (2) fixedly connected to the top of the fixed frame (1), a pressure plate (21) provided on the output shaft of the hydraulic assembly (2), and a cutting plate (19) provided on the pressure plate (21), characterized in that: The pressure plate (21) is provided with a grinding and polishing mechanism, which is used to remove the chamfer and grind the electrode ear after the electrode ear is cut by the cutting plate (19); The grinding and polishing mechanism includes a fixed frame (3), which is fixed to the top of the pressure plate (21). A connecting rod (16) is slidably connected inside the fixed frame (3). The output shaft of the hydraulic component (2) passes through the fixed frame (3) and is fixedly connected to the connecting rod (16). A connecting frame (17) is fixedly connected to one end of the connecting rod (16). The cutting plate (19) is fixed to the bottom outer wall of the connecting frame (17). A second fixed seat (18) is fixedly connected to the side wall of the pressure plate (21). The second fixed seat (18) is slidably sleeved inside the connecting frame (17). An upper support frame (20) is provided at the bottom of the second fixed seat (18). The upper support frame (20) is fixedly connected to the side wall of the pressure plate (21). A sliding groove (22) is opened inside the second fixed seat (18). A docking frame (13) is slidably connected inside the sliding groove (22). A push rod (28) for pushing the docking frame (13) is fixedly connected to the outer wall of the cutting plate (19). One end of the docking frame (13) passes through the second fixed seat (18) and is set outside the second fixed seat (18). Several transmission plates (24) are set at the bottom of the second fixed seat (18). Rotating plates (23) are rotatably connected to the side walls of the transmission plates (24). The tops of the several rotating plates (23) are rotatably connected to the bottom of the docking frame (13). A reset spring (27) for resetting the docking frame (13) is set inside the upper support frame (20). Several upper frosted plates (25) corresponding to the transmission plates (24) are set at the bottom of the upper support frame (20). A transmission rod (26) is fixedly connected to the top of the upper frosted plate (25). The top of the transmission rod (26) is fixedly connected to the transmission plate (24). Several slots (11) for sliding of the transmission rod (26) are opened on the upper support frame (20). The bottom of the fixed frame (1) is fixedly connected to a driving cylinder (10), the output end of the driving cylinder (10) is fixedly connected to a connecting plate (9), and a number of side alignment plates (8) are fixedly connected to the side wall of the connecting plate (9). The connecting plate (9) is fixedly connected to a lower support frame (12) on its side wall. The lower support frame (12) is slidably provided with a lower frosted plate (15) corresponding to the upper frosted plate (25) on its top. The connecting plate (9) is fixedly connected to a first fixed seat (14). The first fixed seat (14) is slidably connected to a docking frame (13). The upper support frame (20) can be completely fitted and docked with the lower support frame (12). The connecting frame (17) has openings for the transmission plate (24) and the upper frosted plate (25) to extend outwards respectively.

2. The electrode tab cutting device for lithium battery manufacturing according to claim 1, characterized in that: The bottom of the fixed frame (1) is fixedly connected to a fixed base (113), and the top of the fixed base (113) is fixedly connected to a collection frame (111).

3. The electrode tab cutting device for lithium battery manufacturing according to claim 2, characterized in that: The collection frame (111) is slidably connected to a pull-out drawer (112), and the outer wall of the pull-out drawer (112) can be completely fitted with the inner wall of the collection frame (111).

4. The electrode tab cutting device for lithium battery manufacturing according to claim 1, characterized in that: The cutting blade (19) can fit completely against the outer wall of the upper support frame (20), and the outer wall of the upper support frame (20) is a smooth wall.

5. A method for cutting off tabs in lithium battery manufacturing, applicable to the tab cutting processing apparatus for lithium battery manufacturing as described in any one of claims 1-4, characterized in that, The method includes the following steps: Step 1: Place the electrode piece whose tab needs to be cut on the conveyor frame (4) for conveying; Step 2: The electrode sheet is transported to the top of the base plate (6) via the conveyor frame (4) and its displacement is restricted by contact with the side baffle (5); Step 3: The hydraulic component (2) drives the fixed frame (3) to slide down until the electrode sheet is pressed tightly, and then the electrode tab is cut off by the cutting plate (19); Step 4: After the electrode tab is cut off, the grinding and polishing mechanism polishes the cut part of the electrode tab to remove the burrs at the cut part.

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