Tab cutting-off treatment device for lithium battery manufacturing and operation method

Abstract

The invention discloses a tab cutting-off treatment device for lithium battery manufacturing and an operation method, and belongs to the technical field of lithium battery manufacturing. The tab cutting-off treatment device comprises a conveying frame, a fixing frame is arranged on one side of the conveying frame, a supporting plate is fixedly connected to the bottom of the fixing frame, a bottom plate is fixedly connected to the top end of the supporting plate, and a side baffle is fixedly connected to the side wall of the bottom plate; a hydraulic assembly is fixedly connected to the top end of the fixing frame, a pressing plate is arranged on an output shaft of the hydraulic assembly, a cutter plate is arranged on the pressing plate, and a grinding and polishing mechanism is arranged on the pressing plate. And burrs can be directly removed, the complex working procedure that after cutting is completed, alignment and grinding are conducted on the electrode plate again is not needed, and the cutting efficiency of the electrode plate and the electrode lug can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery manufacturing, and in particular to a tab cutting processing device and an operating method for lithium battery manufacturing. Background Art

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

[0003] When manufacturing lithium batteries, especially large lithium battery packs, electrode sheets are needed to connect the electrodes of multiple lithium batteries. The tab part of the electrode sheet needs to be 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. In this way, after cutting, the tab needs to be repositioned and then polished. The processing steps are cumbersome, and the tab cannot be polished immediately after cutting.

[0004] Based on this, the present invention designs a tab cutting processing device and operation method for lithium battery manufacturing to solve the above-mentioned problem that the equipment needs to perform cumbersome grinding steps after the electrode tab is polished. Summary of the Invention

[0005] The object of the present invention is to provide a tab cutting device and an operating method for lithium battery manufacturing to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A tab cutting and processing device for lithium battery manufacturing, comprising a conveyor frame, a fixed frame is provided on one side of the conveyor frame, a support plate is fixedly connected to the bottom of the fixed frame, a bottom plate is fixedly connected to the top of the support plate, a side baffle is fixedly connected to the side wall of the bottom plate, a hydraulic assembly is fixedly connected to the top of the fixed frame, a pressure plate is provided on the output shaft of the hydraulic assembly, a cutting plate is provided on the pressure plate, and a grinding and polishing mechanism is provided on the pressure plate, and the grinding and polishing mechanism is used for removing the chamfer and grinding the cut tab after the tab is cut by the cutting plate.

[0007] As a further solution of the present invention, the grinding and polishing mechanism includes a fixed frame, the fixed frame is fixed to the top of the pressure plate, the fixed frame is slidably connected to a connecting rod inside the fixed frame, the output shaft of the prime hydraulic assembly passes through the fixed frame and is fixedly connected to the connecting rod, one end of the connecting rod is fixedly connected to the connecting frame, the cutting plate is fixed to the outer wall of the bottom end of the connecting frame, the side wall of the pressure plate is fixedly connected to a second fixed seat, the second fixed seat is slidably sleeved inside the connecting frame, an upper support frame is provided at the bottom end 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, and the sliding groove is slidably connected to the docking frame, the cutting plate A pushing 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 arranged on the outside of the second fixed seat, and several transmission plates are provided at the bottom of the second fixed seat, and the side walls of the transmission plate are respectively rotatably connected with rotating plates, and the tops of several rotating plates are respectively rotatably connected to the bottom of the docking frame, and a reset spring for resetting the docking frame is provided inside the upper support frame, and several upper frosting plates corresponding to the transmission plate are provided at the bottom of the upper support frame, the top of the upper frosting plate is fixedly connected to the transmission rod, and the top of the transmission rod is fixedly connected to the transmission plate, and the upper support frame is provided with several slots for the transmission rod to slide.

[0008] As a further solution of the present invention, a driving cylinder is fixedly connected to the bottom of the fixing 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 driving cylinder, a lower frosting plate corresponding to the upper frosting plate is slidingly provided on the top of the lower support frame, a first fixing seat is fixedly connected to the side wall of the driving cylinder, and a docking frame is slidably connected inside the first fixing seat.

[0009] As a further solution of the present invention, the bottom end of the fixing frame is fixedly connected to a fixing base, and the top end of the fixing base is fixedly connected to a collecting frame.

[0010] As a further solution of the present invention, a pull-out drawer is slidably connected to the interior of the collection frame, and the outer wall of the pull-out drawer can completely fit with the inner wall of the collection frame.

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

[0012] As a further solution of the present invention, the cutting plate can be completely fitted with the outer wall of the upper support frame, the outer wall of the upper support frame is a smooth wall, and the upper support frame can be completely fitted and docked with the lower support frame.

[0013] A method for cutting off a tab for lithium battery manufacturing, the method comprising the following steps: Step 1: Place the electrode sheet that needs to be cut off on the conveyor rack for transportation; Step 2: The electrode sheet is transported to the top of the bottom plate through the conveyor frame and contacts the side baffle to limit its displacement; Step 3: The hydraulic assembly drives the fixed frame to slide down until the electrode sheet is pressed tightly, and then the tab is cut off by the cutting plate; Step 4: After the tab is cut, the polishing mechanism polishes the cut portion of the tab to remove burrs at the cut portion.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a grinding and polishing mechanism to push the cutting plate down to cut the electrode tab and cut off the excess part on the tab. After cutting, the grinding and polishing mechanism grinds the surface of the tab to remove the burrs cut on the tab and grind it flat. Then the hydraulic component drives the pressure plate to rise, removes the polished electrode sheet from the bottom plate, and continues to transport the electrode sheet through the conveyor rack for cutting. After cutting, the cut part of the tab is directly polished by the grinding and polishing mechanism, which can directly remove the burrs. There is no need to re-perform the complicated process of re-positioning and grinding the electrode sheet after cutting, which can effectively improve the cutting efficiency of the electrode tab. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the fixing frame, side baffles, bottom plate and support plate; Figure 3 This is a schematic diagram of the collection frame, pull-out drawer, and fixed base structure; Figure 4 It is a schematic diagram of the structure of the fixing frame, side alignment plate, connecting plate and driving cylinder; Figure 5 for Figure 4 A in the middle is an enlarged structural diagram; Figure 6 Schematic diagram of the grinding and polishing mechanism structure; Figure 7 for Figure 6 The enlarged structural diagram at B in the middle; Figure 8 Schematic diagram of the grinding and polishing mechanism (cross-sectional view of the second fixed seat and upper support frame); Figure 9 for Figure 8 The enlarged structural diagram at C in the middle; Figure 10 Flow chart of the method of the present invention.

[0016] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Fixed frame; 2. Hydraulic assembly; 3. Fixed frame; 4. Conveyor frame; 5. Side baffle; 6. Bottom plate; 7. Support plate; 8. Side alignment plate; 9. Connecting plate; 10. Driving cylinder; 11. Notch; 12. Lower support frame; 13. Docking frame; 14. First fixed seat; 15. Lower frosting plate; 16. Connecting rod; 17. Connecting frame; 18. Second fixed seat; 19. Cutter plate; 20. Upper support frame; 21. Pressing plate; 22. Slide; 23. Rotating plate; 24. Transmission plate; 25. Upper frosting plate; 26. Transmission rod; 27. Reset spring; 28. Push rod; 111. Collecting frame; 112. Stretch drawer; 113. Fixed base. DETAILED DESCRIPTION

[0017] See also Figure 1-10 The present invention provides a technical solution: a tab cutting and processing device for lithium battery manufacturing, comprising a conveyor frame 4, a fixed frame 1 is provided on one side of the conveyor frame 4, a support plate 7 is fixedly connected to the bottom of the fixed frame 1, a bottom plate 6 is fixedly connected to the top of the support plate 7, a side baffle 5 is fixedly connected to the side wall of the bottom plate 6, a hydraulic assembly 2 is fixedly connected to the top of the fixed frame 1, a pressing plate 21 is provided on the output shaft of the hydraulic assembly 2, a cutting plate 19 is provided on the pressing plate 21, and a grinding and polishing mechanism is provided on the pressing plate 21, and the grinding and polishing mechanism is used to remove the chamfer and grind the tab after the tab is cut by the cutting plate 19; When the above scheme is put into actual use, the electrode sheet that needs to be cut is placed on the fixing frame 1 for transportation. The electrode sheet is transported to the top of the base plate 6 through the fixing frame 1 and stops sliding under the restriction of the side baffle 5. The hydraulic component 2 is started to push the top pressure plate 21 downward to fix the electrode sheet on the base plate 6, and push the cutting plate 19 down to cut the electrode ear and remove the excess part on the ear. After the cutting is completed, the grinding and polishing mechanism grinds the surface of the ear, removes the burrs cut on the ear and polishes it flat. Then the hydraulic component 2 drives the pressure plate 21 to rise, removes the polished electrode sheet from the base plate 6, and continues to transport the electrode sheet through the conveyor frame 4 for cutting. The advantage of this is that after the cutting process, the ear cut is directly polished by the grinding and polishing mechanism, which can directly remove the burrs. There is no need to re-perform the complicated process of positioning and grinding the electrode sheet after the cutting is completed, which can effectively improve the cutting efficiency of the electrode ear.

[0018] As a further solution 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, and a connecting rod 16 is slidably connected to the fixed frame 3. The output shaft of the prime hydraulic assembly 2 passes through the fixed frame 3 and is fixedly connected to the connecting rod 16. One end of the connecting rod 16 is fixedly connected to the connecting frame 17, and the cutting plate 19 is fixed to the outer wall of the bottom end of the connecting frame 17. The side wall of the pressure plate 21 is fixedly connected to the second fixed seat 18, and the second fixed seat 18 is slidably sleeved inside the connecting frame 17. The bottom end of the second fixed seat 18 is provided with an upper support frame 20, and the upper support frame 20 is fixedly connected to the side wall of the pressure plate 21. A slide groove 22 is opened inside the second fixed seat 18, and the slide groove 22 is slidably connected to the docking frame 13. 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 arranged on the outside of the second fixed seat 18. Several transmission plates 24 are provided at the bottom of the second fixed seat 18. The side walls 24 are respectively connected to the rotating plates 23, and the tops of the several rotating plates 23 are respectively connected to the bottom of the docking frame 13. The upper support frame 20 is provided with a reset spring 27 for resetting the docking frame 13. The bottom of the upper support frame 20 is provided with several upper frosting plates 25 corresponding to the transmission plates 24. The top of the upper frosting plate 25 is fixedly connected to the transmission rod 26. The top of the transmission rod 26 is fixedly connected to the transmission plate 24. The upper support frame 20 is provided with several transmission rods 26. 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 plurality of side alignment plates 8 are fixedly connected to the side wall of the connecting plate 9. The side wall of the driving cylinder 10 is fixedly connected to a lower support frame 12, and a lower frosting plate 15 corresponding to the upper frosting plate 25 is slidably provided on the top of the lower support frame 12. A first fixed seat 14 is fixedly connected to the side wall of the driving cylinder 10, and a docking frame 13 is slidably connected inside the first fixed seat 14; When the above scheme is put into actual use, after the electrode sheet is transported to the top of the base plate 6, the driving cylinder 10 is started to push the connecting plate 9 up to contact with the bottom surface of the base plate 6. During the process, the side alignment plate 8 of 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, and then the hydraulic component 2 is lowered. Under the weight of the fixed frame 3 itself, the pressure plate 21 will press down to the upper end of the electrode sheet to position the electrode sheet. At this time, the electrode ear of the electrode sheet is located between the lower grinding plate 15 and the upper grinding plate 25. After the pressure plate 21 presses the electrode sheet, the hydraulic component 2 continues to output so that the connecting rod 16 is pushed down, and the connecting rod 16 drives the connecting frame 17 The connecting frame 17 slides down, and the connecting frame 17 cuts off the electrode tab through the cutting plate 19 at the bottom, cutting off the excess part of the tab. Then, the connecting frame 17 continues to slide down, so that the pushing rod 28 on the cutting plate 19 contacts the docking frame 13 on the second fixing seat 18, pushing the docking frame 13 to compress the reset spring 27 and slide to the bottom of the slide groove 22. The docking frame 13 drives the rotating plate 23 to flip, so that the transmission plate 24 is 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 tab, the outward sliding upper grinding plate 25 can rub the surface of the tab, thereby grinding away the burrs on the upper end face of the tab. As the upper grinding plate 25 extends outward, the push rod 28 continues to slide down so that its bottom contacts the docking frame 13 inside the first fixed seat 14. In the same way, the lower grinding plate 15 on the upper end surface of the lower support frame 12 slides outward, and the lower grinding plate 15 contacts the lower end surface of the pole ear, and grinds the lower end surface of the pole ear by sliding, so that the upper and lower end surfaces of the pole ear are polished clean at the same time by the lower grinding plate 15 and the upper grinding plate 25, thereby achieving the grinding process of the pole ear, and then the pressure plate 21 is pulled upward by the hydraulic component 2 to reset, so that the docking frame 13 is disengaged from the extrusion of the push rod 28, and the docking frame 13 is driven to reset under the elastic force of the reset spring 27, so that the upper and lower grinding plates 25, 15 are reset after transmission, and then the above action can be repeated to cut the electrode tab.

[0019] As a further solution of the present invention, the bottom end of the fixing frame 1 is fixedly connected to a fixing base 113, and the top end of the fixing base 113 is fixedly connected to a collecting frame 111; When the above solution is put into practical use, excess parts of the tabs will be cut off from the electrode sheet after being cut. The collection frame 111 can collect the excess parts for centralized processing to avoid scattering of the cut parts.

[0020] As a further solution of the present invention, a drawer 112 is slidably connected to the interior of the collection frame 111, and the outer wall of the drawer 112 can be completely fitted with the inner wall of the collection frame 111; When the above solution is put into actual use, the cut-off part of the tab enters the collection frame 111 and falls into the stretching drawer 112, where it is collected by the stretching drawer 112. After a large amount of debris is collected, the stretching drawer 112 can be stretched out from the collection frame 111 for cleaning. After cleaning, the stretching drawer 112 can be placed into the collection frame 111 for reuse.

[0021] As a further solution of the present invention, the connecting frame 17 is provided with openings for the transmission plate 24 and the upper grinding plate 25 to extend outwards respectively; When the above solution is put into actual use, the connecting frame 17 will hinder the transmission plate 24 and the upper frosting plate 25 from sliding outward. By opening an opening on the connecting frame 17, the transmission plate 24 and the upper frosting plate 25 can extend outward through the opening, so that the connecting frame 17 will not cause obstruction.

[0022] As a further solution of the present invention, the cutting plate 19 can be completely fitted with the outer wall of the upper support frame 20, the outer wall of the upper support frame 20 is a smooth wall, and the upper support frame 20 can be completely fitted and docked with the lower support frame 12; When the above solution is put into actual use, the cutting plate 19 , which is completely fitted together, can accurately cut the excess portion of the tab when it slides down for cutting, thereby ensuring cutting accuracy.

[0023] A method for cutting off a tab for lithium battery manufacturing, the method comprising the following steps: Step 1: Place the electrode sheet whose tabs need to be cut off on the conveying rack 4 for conveying; Step 2: The electrode sheet is transported to the top of the bottom plate 6 via the conveyor frame 4 and contacts the side baffle 5 to limit its displacement; Step 3: The hydraulic assembly 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 tab is cut, the polishing mechanism polishes the cut portion of the tab to remove burrs at the cut portion.

[0024] Working principle: The electrode sheet that needs to be cut is placed on the fixed frame 1 for transportation. The electrode sheet is transported to the top of the bottom plate 6 through the fixed frame 1. After the electrode sheet is transported to the top of the bottom plate 6, the driving cylinder 10 is started to push the connecting plate 9 up to contact with the bottom surface of the bottom plate 6. During the process, the side alignment plate 8 of 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, and then the hydraulic component 2 is lowered. Under the weight of the fixed frame 3 itself, the pressure plate 21 will press down to the upper end of the electrode sheet to position the electrode sheet. At this time, the electrode ear of the electrode sheet is located between the lower grinding plate 15 and the upper grinding plate 25. After the pressure plate 21 presses the electrode sheet, the hydraulic component 2 continues to output so that the connecting rod 16 is pushed The connecting rod 16 drives the connecting frame 17 to slide down, and the connecting frame 17 cuts off the electrode tab through the cutting plate 19 at the bottom, cutting off the excess part of the tab. Then the connecting frame 17 continues to slide down, so that the pushing rod 28 on the cutting plate 19 contacts the docking frame 13 on the second fixed seat 18, pushing the docking frame 13 to compress the return spring 27 and slide to the bottom of the slide groove 22, and the docking frame 13 drives the rotating plate 23 to flip, so that the transmission plate 24 is pushed outward by the rotating plate 23, and 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 tab, the outward sliding upper grinding plate 25 can rub the surface of the tab, thereby grinding the burrs on the upper end face of the tab clean. As the upper grinding plate 25 extends outward, the push rod 28 continues to slide down so that its bottom contacts the docking frame 13 inside the first fixed seat 14. In the same way, the lower grinding plate 15 on the upper end surface of the lower support frame 12 slides outward, and the lower grinding plate 15 contacts the lower end surface of the pole ear, and grinds the lower end surface of the pole ear by sliding, so that the upper and lower end surfaces of the pole ear are polished clean at the same time by the lower grinding plate 15 and the upper grinding plate 25, thereby achieving the grinding process of the pole ear, and then the pressure plate 21 is pulled upward by the hydraulic component 2 to reset, so that the docking frame 13 is disengaged from the extrusion of the push rod 28, and the docking frame 13 is driven to reset under the elastic force of the reset spring 27, so that the upper and lower grinding plates 25, 15 are reset after transmission, and then the above action can be repeated to cut the electrode tab.

Claims

1. A tab cutting and processing device for lithium battery manufacturing, comprising a conveyor frame (4), a fixed frame (1) is provided on one side of the conveyor frame (4), a support plate (7) is fixedly connected to the bottom of the fixed frame (1), a bottom plate (6) is fixedly connected to the top of the support plate (7), a side baffle (5) is fixedly connected to the side wall of the bottom plate (6), a hydraulic assembly (2) is fixedly connected to the top of the fixed frame (1), a pressure plate (21) is provided on the output shaft of the hydraulic assembly (2), and a cutting plate (19) is provided on the pressure plate (21), characterized in that: A grinding and polishing mechanism is provided on the pressing plate (21), and the grinding and polishing mechanism is used to remove the chamfers and grind the cut pole tab after the pole tab is cut by the cutting plate (19).

2. The tab cutting device for lithium battery manufacturing according to claim 1, characterized in that: The grinding and polishing mechanism includes a fixed frame (3), the fixed frame (3) is fixed on the top of the pressure plate (21), a connecting rod (16) is slidably connected inside the fixed frame (3), the output shaft of the prime hydraulic assembly (2) passes through the fixed frame (3) and is fixedly connected to the connecting rod (16), one end of the connecting rod (16) is fixedly connected to a connecting frame (17), the cutting plate (19) is fixed on the outer wall of the bottom end of the connecting frame (17), the side wall of the pressure plate (21) is fixedly connected to a second fixed seat (18), the second fixed seat (18) is slidably sleeved inside the connecting frame (17), an upper support frame (20) is provided at the bottom end of the second fixed seat (18), the upper support frame (20) is fixedly connected to the side wall of the pressure plate (21), a slide groove (22) is provided inside the second fixed seat (18), and the slide groove (22) is slidably connected to the docking frame (13).

3. The tab cutting device for lithium battery manufacturing according to claim 2, characterized in that: The outer wall of the cutting plate (19) is fixedly connected with a (28) for pushing the docking frame (13), one end of the docking frame (13) passes through the second fixed seat (18) and is arranged on the outside of the second fixed seat (18), and a plurality of transmission plates (24) are provided at the bottom of the second fixed seat (18), and the side walls of the transmission plates (24) are respectively rotatably connected with rotating plates (23), and the top ends of the plurality of rotating plates (23) are respectively rotatably connected to the bottom of the docking frame (13), and a reset spring (27) for resetting the docking frame (13) is provided inside the upper support frame (20), and a plurality of upper grinding plates (25) corresponding to the transmission plates (24) are provided at the bottom of the upper support frame (20), and the top ends of the upper grinding plates (25) are fixedly connected with a transmission rod (26), and the top ends of the transmission rod (26) are fixedly connected to the transmission plate (24), and the upper support frame (20) is provided with a plurality of slots (11) for the transmission rod (26) to slide.

4. The tab cutting device for lithium battery manufacturing according to claim 1, characterized in that: The bottom of the fixing 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 plurality of side alignment plates (8) are fixedly connected to the side wall of the connecting plate (9).

5. The tab cutting device for lithium battery manufacturing according to claim 1, characterized in that: The side wall of the driving cylinder (10) is fixedly connected to a lower support frame (12), and a lower frosting plate (15) corresponding to the upper frosting plate (25) is slidably provided on the top of the lower support frame (12). A first fixing seat (14) is fixedly connected to the side wall of the driving cylinder (10), and a docking frame (13) is slidably connected inside the first fixing seat (14).

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

7. The tab cutting device for lithium battery manufacturing according to claim 6, characterized in that: A stretching drawer (112) is slidably connected to the interior of the collection frame (111), and the outer wall of the stretching drawer (112) can completely fit with the inner wall of the collection frame (111).

8. The tab cutting device for lithium battery manufacturing according to claim 2, characterized in that: The connecting frame (17) is provided with openings for the transmission plate (24) and the upper grinding plate (25) to extend outwards.

9. The tab cutting device for lithium battery manufacturing according to claim 3, characterized in that: The cutting plate (19) can completely fit with the outer wall of the upper support frame (20), the outer wall of the upper support frame (20) is a smooth wall, and the upper support frame (20) can completely fit and dock with the lower support frame (12).

10. A method for cutting off a tab for lithium battery manufacturing, applicable to any one of the tab cutting processing devices for lithium battery manufacturing according to claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: placing the electrode sheet whose tabs need to be cut off on a conveying rack (4) for conveying; Step 2: The electrode sheet is transported to the top of the bottom plate (6) via the conveyor frame (4) and contacts the side baffle (5) to limit its displacement; Step 3: The hydraulic assembly (2) drives the fixed frame (3) to slide down until the electrode sheet is pressed tightly, and then the electrode ear is cut off by the cutting plate (19); Step 4: After the tab is cut, the polishing mechanism polishes the cut portion of the tab to remove burrs at the cut portion.

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