Method for manufacturing pole piece, processing equipment and pole piece

Abstract

The application provides a manufacturing method of a pole piece, a manufacturing device and the pole piece. The manufacturing method comprises: a first slitting process, in which a first cutting seam is formed on a pole piece material belt by cutting along a first direction; and a second slitting process, in which a second cutting seam is formed on the pole piece material belt by cutting along a second direction, so that the pole pieces adjacent along the first direction are separated. The first slitting process and the second slitting process are performed at the same station, and the pole piece material belt forms a pair of pole pieces arranged along the second direction. On the one hand, the pole piece material belt is not slit in the upstream process, so that the structural integrity of the pole piece material belt is not damaged, the self-supporting strength of the pole piece material belt is high, and the pole piece material belt cannot be blocked. On the other hand, the first slitting process and the second slitting process are completed at one station in the manufacturing process, so that the relative positions of the first cutting seam and the second cutting seam can be kept consistent.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, specifically to electrode preparation methods, processing equipment, and electrodes. Background Technology

[0002] In the battery manufacturing process, electrode strips need to be processed, including tab forming, cutting, etc., to form electrode sheets. In traditional sheet manufacturing processes, one electrode sheet is processed after the strip flows through each station, so the processing speed is a bottleneck and cannot meet the demand for high production capacity.

[0003] Furthermore, in some existing processing techniques, the material strip is made with empty foil areas on both sides. This allows for the processing of two electrode sheets along the width direction after the material strip flows through each station, achieving a "one-out-of-two" sheet production method. This increases the processing speed.

[0004] In the one-to-two electrode fabrication process, the electrode strip needs to be cut laterally and longitudinally to separate two adjacent electrodes along the width of the strip. However, after the transverse cut, the structure of the electrode strip is damaged and loses its support, leading to material blockage during downstream transport and affecting processing efficiency. Furthermore, the electrode strip vibrates during transport, causing the slit positions of the transverse and longitudinal cuts to be inconsistent with each cut, resulting in dimensional deviations in the processed electrodes and affecting subsequent lamination processes. Summary of the Invention

[0005] This invention provides a method for manufacturing an electrode, a processing equipment, and an electrode, to solve the problems of material blockage and large dimensional deviations of the processed electrode in the existing manufacturing process.

[0006] In a first aspect, the present invention provides a method for manufacturing an electrode sheet, comprising: a first slitting step, wherein a first slit is formed by cutting the electrode sheet strip along a first direction; and a second slitting step, wherein a second slit is formed by cutting the electrode sheet strip along a second direction, wherein the first slitting step and the second slitting step are performed at the same station, and the electrode sheet strip is formed into a pair of electrodes arranged along the second direction.

[0007] Optionally, it also includes: an electrode tab cutting process, in which the electrode tab is cut and formed in the empty foil area of ​​the electrode strip, the electrode tab cutting process being performed before the first slitting process and the second slitting process.

[0008] Optionally, it also includes: a grooving process, which forms grooves on the electrode strip. The grooving process is performed before the first slitting process and the second slitting process, wherein the first slit connects two adjacent grooves and the second slit penetrates the groove.

[0009] Optionally, the tab cutting process and the grooving process can be performed at the same station.

[0010] Optionally, it further includes: a feeding process, including causing the electrode strip to flow along a first direction and causing the electrode strip to pass sequentially through a first cutting mechanism and a second cutting mechanism, wherein the tab cutting process and the grooving process are performed in the first cutting mechanism, and the first slitting process and the second slitting process are performed in the second cutting mechanism.

[0011] Optionally, along the first direction, the size of the electrode is in the range of 40 mm to 450 mm; and / or, along the second direction, the size of the electrode is in the range of 50 mm to 1500 mm.

[0012] Optionally, the ratio of the dimension a of the electrode along the first direction X to the dimension b of the electrode along the second direction Y is in the range of 0.026 to 9.

[0013] Optionally, the electrode strip includes a coated area and two empty foil areas distributed on both sides of the coated area along a second direction.

[0014] Optionally, the groove can be polygonal, circular, or elliptical.

[0015] Optionally, the groove is polygonal, with compensation segments connecting adjacent sides.

[0016] Secondly, the present invention provides an electrode processing apparatus, comprising: a first slitting cutter extending along a first direction, the first slitting cutter being used to cut the electrode strip along the first direction to form a first slit; and a second slitting cutter extending along a second direction, the second slitting cutter being used to cut the electrode strip along the second direction to form a second slit; the first slitting cutter being located upstream or downstream of the second slitting cutter, wherein the first slitting cutter and the second slitting cutter are at the same work station.

[0017] Optionally, the second slitting tool includes a first cutting segment and a second cutting segment spaced apart, with the first slitting tool located between the first cutting segment and the second cutting segment.

[0018] Optionally, it also includes a first cutting mechanism and a second cutting mechanism. The first cutting mechanism is located upstream of the second cutting mechanism. The first cutting mechanism includes an electrode tab cutting tool and a grooving tool. The electrode tab cutting tool is used to cut the electrode tabs, and the grooving tool is used to groove the electrode strip. The second cutting mechanism includes a first slitting tool and a second slitting tool.

[0019] Optionally, the first cutting mechanism further includes a first lower die base and a first upper die base. The first lower die base is provided with a first tool holder, which is provided with a first cutting groove corresponding to the tab cutting tool and a second cutting groove corresponding to the grooving tool. The tab cutting tool and the first cutting groove are two symmetrically arranged along the second direction. The grooving tool is arranged between the two tab cutting tools, and the second cutting groove is arranged between the two first cutting grooves.

[0020] Alternatively, the cross-section of the grooving tool may be polygonal, circular, or elliptical.

[0021] Optionally, the cross-section of the grooving tool is polygonal, with transition sections between adjacent sides, which are either straight lines or arcs.

[0022] Optionally, the second cutting mechanism further includes a second lower mold base and a second upper mold base. The second lower mold base is provided with a second cutter holder, and the second cutter holder is provided with a third cutter groove corresponding to the first cutting cutter. The first cutting cutter and the second cutting cutter are arranged perpendicularly, and the first cutting cutter is located upstream or downstream of the second cutting cutter.

[0023] Optionally, the electrode cutting tool includes a first edge, a second edge, a third edge, and a fourth edge. The first and second edges are used to cut the root of the electrode, and the third and fourth edges are used to cut the first and second corners of the electrode sheet facing the electrode, respectively. The grooving tool is used to cut the third and fourth corners of the electrode sheet away from the electrode.

[0024] Optionally, the tab cutting tool includes a protruding structure, with the roots on both sides of the protruding structure forming a third edge and a fourth edge, and the top of the protruding structure forming a fifth edge.

[0025] Optionally, the protruding structures of the two tab cutting tools and the grooving tool are arranged in a collinear manner.

[0026] Optionally, the tab cutting tool includes a first cutting block and a second cutting block spaced apart along a first direction. On the opposite side of the first cutting block and the second cutting block, and in the direction between the two tab cutting tools, a first edge is formed at the corner of the first cutting block, and a second edge is formed at the corner of the second cutting block.

[0027] Optionally, a protruding structure is provided on the side of the second cutting block in the direction between the two tab cutting tools, and the protruding structure is spaced from the edge of the second cutting block opposite to the edge of the first cutting block.

[0028] Optionally, the second cutting edge also includes a sixth edge, which is located on the side of the protrusion structure away from the first cutting edge, the third edge is located on the side of the protrusion structure facing the first cutting edge, the fourth edge is located on the side of the protrusion structure away from the first cutting edge, the sixth edge is connected to the fourth edge, and the sixth edge is inclined in a direction away from the two tab cutting tools.

[0029] Optionally, the tab cutting tool is rectangular, and in the direction between the two tab cutting tools, the two corners of the tab cutting tool along the first direction form a first edge and a second edge, respectively.

[0030] Optionally, a protruding structure is provided on the side of the electrode cutting tool in the direction between the two electrode cutting tools.

[0031] Optionally, both the first cutting mechanism and / or the second cutting mechanism include a conveyor belt with suction holes.

[0032] Optionally, the conveyor belt is a liftable structure; and / or, there are two conveyor belts, which are spaced apart along a second direction.

[0033] Optionally, there are two tab cutting tools distributed along the second direction, and a grooving tool is located between the two tab cutting tools, wherein at least one tab cutting tool is movably arranged along the second direction.

[0034] Optionally, the first cutting mechanism further includes: a base, on which a guide rail is provided, the guide rail extending along a second direction; two first cutting parts, both movably disposed on the guide rail, the two first cutting parts being distributed along the second direction; two tab cutting tools respectively disposed on the two first cutting parts; a second cutting part disposed on the base and located between the two first cutting parts; a grooving tool disposed on the second cutting part; and a driving structure disposed on the base and driving the two first cutting parts to move closer to each other or to move further away from each other.

[0035] Thirdly, the present invention provides an electrode sheet, comprising: an electrode sheet body, including two opposing first sides and two opposing second sides, at least one first side being provided with an electrode tab, and adjacent first sides and adjacent second sides forming a corner; a notched corner structure, provided at the corner, the outline of the notched corner structure including a body segment and a buffer segment, at least one end of the body segment being provided with a buffer segment, and a preset angle between the body segment and the buffer segment.

[0036] Optionally, the body segment can be a straight line or an arc; and / or, the buffer segment can be a straight line or an arc.

[0037] Optionally, buffer sections are provided at both ends of the body section, one of which is connected to the first side and the other is connected to the second side.

[0038] Optionally, of the two buffer sections, the buffer section closer to the first side is arranged perpendicular to the first side, and the buffer section closer to the second side is arranged perpendicular to the second side.

[0039] Optionally, both the body segment and the buffer segment are straight lines, and there is a smooth transition between the body segment and the buffer segment.

[0040] Optionally, the angle between the body segment and the buffer segment is in the range of 110° to 170°.

[0041] Beneficial effects: The electrode manufacturing method of this invention includes a first slitting process and a second slitting process. The first slitting process involves cutting the electrode strip along a first direction to form a first slit, and the second slitting process involves cutting the electrode strip along a second direction to form a second slit. By performing the first and second slitting processes at the same station, the electrode strip is not slitted in the upstream process, thus preserving its structural integrity and ensuring high self-support strength, preventing material blockage. Furthermore, completing both slitting processes at a single station during manufacturing ensures that the relative positions of the first and second slits remain consistent, preventing significant positional deviations caused by vibrations during electrode strip transport. Therefore, the dimensional deviation of the processed electrode is small. Thus, the technical solution of this invention solves the problems of material blockage and large dimensional deviations of the processed electrode in existing manufacturing processes. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 A schematic diagram of the electrode structure is shown; Figure 2 A schematic diagram of the electrode strip is shown; Figure 3 The diagram shows the cutting of the empty foil area on the electrode strip, as well as the second slit, the first slit, and the groove; Figure 4 A schematic diagram illustrating an embodiment of the film-making method of the present invention is shown; Figure 5 It shows Figure 4 A schematic diagram of the middle electrode cutting tool cutting the empty foil area; Figure 6 It shows Figure 4 A schematic diagram of the cutting groove structure of the second cutting tool in the middle; Figure 7 A schematic diagram of the structure of the first cutting mechanism of an embodiment of the electrode processing equipment according to the present invention is shown; Figure 8 It shows Figure 7 A schematic diagram of the structure of the first lower die base of the first cutting mechanism; Figure 9 It shows Figure 7 A schematic diagram of the structure of the first upper die base of the first cutting mechanism; Figure 10 It shows Figure 9 A schematic diagram of the interface contour of a center punching tool; Figure 11 It shows Figure 9 A schematic diagram of the structure of the electrode lug cutting tool of the first upper die holder; Figure 12 A schematic diagram of the structure of the second cutting mechanism of an embodiment of the electrode processing equipment according to the present invention is shown; Figure 13 It shows Figure 12 A schematic diagram of the structure of the second lower die base of the second cutting mechanism; Figure 14 It shows Figure 12 A schematic diagram of the structure of the second upper die holder of the second cutting mechanism; Figure 15 A schematic diagram of another form of the tab cutting tool is shown; Figure 16 A schematic diagram of the conveyor belt is shown; Figure 17 A schematic diagram of the first cutting mechanism of Embodiment 2 of the sheet-making method of the present invention is shown; Figure 18 It shows Figure 17 A side view of the first cutting mechanism; Figure 19 Schematic diagrams showing different forms of interface profiles for grooving tools are shown; Figure 20 A schematic diagram of a structure showing the first slitting tool located downstream of the second slitting tool is shown. Figure 21 A schematic diagram of the structure of the electrode according to this application is shown; Figure 22 A schematic diagram of the notched corner structure of the electrode sheet according to this application is shown.

[0044] Explanation of reference numerals in the attached figures: 1000, Electrode strip; 1001, Coating area; 1002, Empty foil area; 1003, Second slit; 1004, First slit; 1005, Groove; 10051, Compensation section; 2000, Electrode; 2001, Electrode tab; 2002, Electrode root; 2003, First corner; 2004, Second corner; 2005, Third corner; 2006, Fourth corner; 2007, First side; 2008, Second side; 2009, Third side; 2010, Fourth side; 1. First cutting mechanism; 11. Electrode cutting tool; 1101. First cutting block; 1102. Second cutting block; 1103. Protruding structure; 111. First edge; 112. Second edge; 113. Third edge; 114. Fourth edge; 115. Fifth edge; 116. Sixth edge; 12. Slotting tool; 121. Transition section; 13. First lower die base; 14. First upper die base; 15. First tool holder; 151. First tool groove; 152. Second tool groove; 16. Base; 161. Guide rail; 17. First cutting part; 18. Second cutting part; 2. Second cutting mechanism; 21. First slitting cutter; 22. Second slitting cutter; 221. First cutting section; 222. Second cutting section; 23. Second lower die holder; 24. Second upper die holder; 25. Second cutter holder; 251. Third cutting groove; 3. Conveyor belt; 301. Adsorption holes; 4. Electrode body; 41. First side; 42. Second side; 43. Corner; 5. Corner-cut structure; 51. Main body segment; 52. Buffer segment. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the battery manufacturing process, electrode strips need to be processed, including tab forming, cutting, etc., to form electrode sheets. In traditional sheet manufacturing processes, one electrode sheet is processed after the strip flows through each station, so the processing speed is a bottleneck and cannot meet the demand for high production capacity.

[0047] Furthermore, in some existing processing techniques, the material strip is made with empty foil areas on both sides. This allows for the processing of two electrode sheets along the width direction after the material strip flows through each station, achieving a "one-out-of-two" sheet production method. This increases the processing speed.

[0048] In the one-out-two electrode fabrication process, the electrode strip needs to be cut both horizontally and vertically to separate two adjacent electrodes along the width of the strip. Horizontal cutting refers to cutting along the length of the strip, while vertical cutting refers to cutting along the width of the strip. In traditional one-out-two electrode fabrication processes, horizontal and vertical cutting are performed separately, in two different mechanisms. Since the electrode strip is completely separated after vertical cutting, existing technologies first perform horizontal cutting in the upstream mechanism and then vertical cutting in the downstream mechanism to ensure the electrode strip can be continuously fed before it is completely separated.

[0049] The applicant discovered in production practice that in the aforementioned one-to-two production process, after transverse cutting, the electrode strip has multiple intermittent transverse slits in the middle, with very small gaps between them. This disrupts the structure of the electrode strip, causing it to lose support. Especially for longer electrodes, the sides of the transverse slits wrinkle and sag. During downstream transport, the wrinkled and sagged portions of the electrode strip accumulate at the longitudinal cutting position, causing material blockage and affecting processing efficiency. Furthermore, the electrode strip vibrates during transport, resulting in inconsistent slit positions for transverse and longitudinal cutting each time, leading to dimensional deviations in the processed electrodes and affecting subsequent stacking processes.

[0050] like Figures 1 to 4 As shown, an embodiment of the electrode fabrication method according to this application includes the following steps: In the first slitting process, the electrode strip 1000 is cut along the first direction X to form a first slit 1004, so that the adjacent electrodes 2000 are separated along the second direction Y after slitting.

[0051] In the second slitting process, the electrode strip 1000 is cut along the second direction Y to form a second slit 1003, so that the adjacent electrodes 2000 along the first direction X are separated after slitting, and the first slit 1004 and the second slit 1003 are connected.

[0052] Furthermore, in the technical solution of this embodiment, the first slitting process and the second slitting process are performed at the same station, and the electrode strip 1000 is formed into a pair of electrodes 2000 arranged along the second direction Y.

[0053] Using the technical solution of this embodiment, the electrode manufacturing method includes a first slitting process and a second slitting process. The first slitting process cuts along a first direction X on the electrode strip 1000 to form a first slit 1004, and the second slitting process cuts along a second direction Y on the electrode strip 1000 to form a second slit 1003. By performing the first slitting process and the second slitting process at the same station, on the one hand, the electrode strip is not slitted in the upstream process, so the structural integrity of the electrode strip 1000 is not damaged, the electrode strip 1000 has high self-support strength, and material blockage will not occur. On the other hand, completing the first slitting process and the second slitting process at one station during the manufacturing process ensures that the relative positions of the first slit 1004 and the second slit 1003 remain consistent, preventing large positional deviations of the first slit 1004 and the second slit 1003 caused by vibration during the transportation of the electrode strip 1000. Therefore, the dimensional deviation of the processed electrode is small. Therefore, the technical solution of this embodiment solves the problems of material blockage and large dimensional deviation of the processed electrode sheets in the prior art.

[0054] In this embodiment, the electrode fabrication method is used to process the electrode strip 1000 into an electrode 2000.

[0055] like Figure 2 As shown, the electrode strip 1000 extends along a first direction X, which is also the flow direction of the electrode strip 1000. The electrode strip 1000 includes a coating area 1001 and an empty foil area 1002. There are two empty foil areas 1002, which are located on both sides of the coating area 1001 along the second direction Y, and the empty foil areas 1002 are in the shape of narrow strips.

[0056] Furthermore, the coated area 1001 refers to the metal foil being coated with an active material layer, which can be either a positive or negative electrode active material layer. The empty foil area 1002 refers to the metal foil not being coated with an active material layer, that is, the empty foil area 1002 is the bare metal foil.

[0057] like Figure 1 As shown, electrode 2000 is formed after processing electrode strip 1000. Figure 1 As shown. The electrode 2000 has an electrode tab 2001 on one side of the second direction Y. The electrode tab 2001 has two electrode tab roots 2002 on both sides along the first direction X, and the electrode tab roots 2002 are arc-shaped.

[0058] Furthermore, the electrode 2000 also includes a first side 2007, a second side 2008, a third side 2009, and a fourth side 2010. The first side 2007 and the second side 2008 extend along a first direction X and are positioned opposite each other along a second direction Y. The third side 2009 and the fourth side 2010 extend along the second direction Y and are positioned opposite each other along the first direction X. The intersection of the first side 2007 and the fourth side 2010 forms a first corner 2003, the intersection of the first side 2007 and the third side 2009 forms a second corner 2004, the intersection of the second side 2008 and the third side 2009 forms a third corner 2005, and the intersection of the second side 2008 and the fourth side 2010 forms a fourth corner 2006.

[0059] Among them, the first angle 2003, the second angle 2004, the third angle 2005 and the fourth angle 2006 can be straight, curved or irregular in shape.

[0060] Those skilled in the art will understand that the first corner 2003 and the second corner 2004 are the apex corners of the electrode 2000, and the third corner 2005 and the fourth corner 2006 are the base corners of the electrode 2000.

[0061] In this embodiment, the electrode strip 1000 is processed into electrode 2000 by the first cutting mechanism 1 and the second cutting mechanism 2.

[0062] like Figure 2 As shown, the electrode strip 1000 extends along a first direction X, which is also the flow direction of the electrode strip 1000. The electrode strip 1000 includes a coating area 1001 and an empty foil area 1002. There are two empty foil areas 1002, which are located on both sides of the coating area 1001 along the second direction Y, and the empty foil areas 1002 are in the shape of narrow strips.

[0063] Furthermore, the coated area 1001 refers to the metal foil being coated with an active material layer, which can be either a positive or negative electrode active material layer. The empty foil area 1002 refers to the metal foil not being coated with an active material layer, that is, the empty foil area 1002 is the bare metal foil.

[0064] like Figure 1 As shown, electrode 2000 is formed after processing electrode strip 1000. Figure 1 As shown. The electrode 2000 has an electrode tab 2001 on one side of the second direction Y. The electrode tab 2001 has two electrode tab roots 2002 on both sides along the first direction X, and the electrode tab roots 2002 are arc-shaped.

[0065] Furthermore, the electrode 2000 also includes a first side 2007, a second side 2008, a third side 2009, and a fourth side 2010. The first side 2007 and the second side 2008 extend along a first direction X and are positioned opposite each other along a second direction Y. The third side 2009 and the fourth side 2010 extend along the second direction Y and are positioned opposite each other along the first direction X. The intersection of the first side 2007 and the fourth side 2010 forms a first corner 2003, the intersection of the first side 2007 and the third side 2009 forms a second corner 2004, the intersection of the second side 2008 and the third side 2009 forms a third corner 2005, and the intersection of the second side 2008 and the fourth side 2010 forms a fourth corner 2006.

[0066] Among them, the first angle 2003, the second angle 2004, the third angle 2005 and the fourth angle 2006 can be straight, curved or irregular in shape.

[0067] like Figure 3 As shown, in the first slitting process, the electrode strip 1000 is cut along the first direction X to form a first slit 1004. The first slit 1004 separates two adjacent electrodes 2000 in the second direction Y, that is, forms the second side 2008 of the electrode 2000.

[0068] like Figure 3 As shown, in the second slitting process, the electrode strip 1000 is cut along the second direction Y to form a second slit 1003. The second slit 1003 separates two adjacent electrodes 2000 in the first direction X, that is, forms the third side 2009 and the fourth side 2010 of the electrode 2000.

[0069] Furthermore, in the second slitting process, the second slit 1003 must penetrate the electrode strip 1000 along the second direction Y to ensure that the electrode 2000 is separated.

[0070] Combination Figures 1 to 3 As shown, through the first and second slitting processes, the electrode strip 1000 can be processed into two electrode sheets 2000 symmetrical along the second direction Y, which means that the electrode strip 1000 can be processed in two ways.

[0071] Furthermore, the phrase "the first slitting process and the second slitting process are carried out at the same station" means that the first slitting process and the second slitting process are carried out on the same cutting equipment. That is, the electrode strip 1000 remains stationary during the first slitting process and the second slitting process. There is no process of the electrode strip 1000 moving between the first slitting process and the second slitting process.

[0072] It should be noted that, within the same workstation, such as Figure 4 As shown, the first slit 1004 processed in the first slitting process can be located upstream of the second slit 1003 processed in the second slitting process. Or as... Figure 20 As shown, the first slit 1004 processed in the first slitting process can also be located downstream of the second slit 1003 processed in the second slitting process.

[0073] This process setup has the following advantages: Firstly, in the upstream processes of the first and second slitting processes, the electrode strip 1000 is not slit, meaning the integrity of the electrode strip 1000 is not compromised (i.e., the coating area 1001 does not have long slits). As a result, the electrode strip 1000 maintains high strength and does not wrinkle or sink during transport, exhibiting good throughput. This prevents material blockage during electrode processing.

[0074] Secondly, since the first and second slitting processes are performed at the same station, as long as the relative positional accuracy of the two cutting tools is guaranteed, the relative positional accuracy of the first slit 1004 and the second slit 1003 can be guaranteed. Even if the electrode strip 1000 vibrates during the transfer process, the relative positions of the first slit 1004 and the second slit 1003 will not be affected, so the dimensional consistency of the processed electrode 2000 is good.

[0075] Furthermore, the first and second slitting processes can be carried out simultaneously at the same workstation or in separate steps.

[0076] For example, in the same workstation, the first cut 1004 and the second cut 1003 can be cut simultaneously.

[0077] For example, in the same workstation, the first cut 1004 can be cut first, followed by the second cut 1003. Alternatively, the second cut 1003 can be cut first, followed by the first cut 1004.

[0078] Furthermore, in the technical solution of this embodiment, the film preparation method further includes: The tab cutting process involves cutting and forming tabs 2001 in the empty foil area 1002 of the electrode strip 1000. The tab cutting process is performed before the first slitting process and the second slitting process.

[0079] like Figure 4 As shown, the empty foil area 1002 is cut to form the electrode tab 2001 through the tab cutting process. Figure 5As shown, more specifically, in the electrode cutting process, two electrode roots 2002 are also cut and shaped, as well as the first corner 2003 and the second corner 2004 of the electrode sheet 2000 are cut and shaped, and the first side 2007 of the electrode sheet is cut and shaped.

[0080] Furthermore, the tab cutting process is performed before the first and second slitting processes. That is, the integrity of the electrode strip 1000 is not compromised when it flows between the tab cutting process and the first and second slitting processes. Thus, the electrode strip 1000 maintains high strength and does not wrinkle or sink during flow, resulting in good throughput. This also prevents material blockage during electrode processing.

[0081] Furthermore, in the technical solution of this embodiment, the film preparation method further includes: The grooving process forms a groove 1005 on the electrode strip 1000. The grooving process is carried out before the first slitting process and the second slitting process. The first slit 1004 connects two adjacent grooves 1005, and the second slit 1003 penetrates the groove 1005.

[0082] like Figure 4 As shown, the coating area 1001 is cut through a grooving process to form a groove 1005. And combined with... Figure 6 As can be seen, the groove 1005 is polygonal, and the groove 1005 cuts and forms the third corner 2005 and the fourth corner 2006 of the electrode sheet 2000. Furthermore, the groove 1005 is located at the middle position of the coating area 1001 along the second direction Y.

[0083] Furthermore, the grooving process is performed before the first and second slitting processes. This means that the integrity of the electrode strip 1000 is not compromised during the grooving process and between the first and second slitting processes. As a result, the electrode strip 1000 maintains high strength and does not wrinkle or sink during transfer, exhibiting good throughput. This also prevents material blockage during electrode processing.

[0084] like Figure 3 As shown, in this embodiment, the tab cutting process and the grooving process are performed at the same station. That is, both the tab cutting process and the grooving process are performed before the first slitting process and the second slitting process, and the tab cutting process and the grooving process are performed synchronously.

[0085] In some embodiments, the tab cutting process and the grooving process can also be performed at different workstations.

[0086] For example, the tab cutting process can be carried out in one station first, and the grooving process can be carried out in another station.

[0087] For example, the grooving process can be carried out in one station first, and the tab cutting process can be carried out in another station.

[0088] Furthermore, the tab cutting process and the grooving process can be carried out simultaneously at the same workstation, or they can be carried out in separate steps.

[0089] For example, in the same workstation, tab 2001 and slot 1005 can be cut simultaneously.

[0090] For example, in the same workstation, the tab 2001 can be cut first, followed by the groove 1005. Alternatively, the groove 1005 can be cut first, followed by the tab 2001.

[0091] like Figure 6 As shown, in the technical solution of this embodiment, the groove 1005 can also be in other forms, such as polygonal, circular or elliptical.

[0092] like Figure 6 As shown, when the groove 1005 is polygonal in shape, a compensation section 10051 connects adjacent sides. The function of the compensation section 10051 is to ensure that when the electrode strip 1000 vibrates during transit, the slitting tool cuts on the compensation section 10051 instead of directly cutting on the beveled side. This ensures the structural integrity of the third corner 2005 and the fourth corner 2006 of the electrode 2000.

[0093] Optionally, the shape of the compensation segment 10051 can be a straight line, an arc, or other irregular shape.

[0094] Furthermore, in the technical solution of this embodiment, the film preparation method further includes: The feeding process includes causing the electrode strip 1000 to flow along the first direction X and causing the electrode strip 1000 to pass through the first cutting mechanism 1 and the second cutting mechanism 2 in sequence. The electrode tab cutting process and the grooving process are carried out in the first cutting mechanism 1, and the first slitting process and the second slitting process are carried out in the second cutting mechanism 2.

[0095] like Figure 4 As shown, in the feeding process, the electrode strip 1000 is fed along the first direction X. The electrode strip 1000 first passes through the first cutting mechanism 1, and then through the second cutting mechanism 2.

[0096] like Figure 4As shown, the electrode strip 1000 is cut with tabs 2001 and grooves 1005 in the first cutting mechanism 1, and the electrode strip 1000 is cut with a first slit 1004 and a second slit 1003 in the second cutting mechanism 2. In other words, in the technical solution of this embodiment, the integrity of the electrode strip 1000 is not compromised when it flows between the first cutting mechanism 1 and the second cutting mechanism 2. Thus, the electrode strip 1000 maintains high strength and does not wrinkle or sink during the flow process, resulting in good throughput. This also prevents material blockage during electrode processing.

[0097] like Figure 1 As shown, along the first direction X, the size a of electrode 2000 is in the range of 40mm to 450mm.

[0098] Here, the dimension 'a' of electrode 2000 refers to the distance between the third side 2009 and the fourth side 2010 of electrode 2000.

[0099] For example, the size 'a' of electrode 2000 can be 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, 360mm, 370mm, 380mm, 390mm, 400mm, 410mm, 420mm, 430mm, 440mm, or 450mm, as well as any value between two adjacent values.

[0100] like Figure 1 As shown, along the second direction Y, the size b of electrode 2000 is in the range of 50mm to 1500mm.

[0101] Here, the dimension b of electrode 2000 refers to the distance between the first side 2007 and the second side 2008 of electrode 2000.

[0102] For example, the size b of electrode 2000 can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 950mm, 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, or 1500mm, as well as any value between two adjacent values.

[0103] Furthermore, such as Figure 1 As shown, the ratio of the dimension a of the electrode along the first direction X to the dimension b of the electrode along the second direction Y is in the range of 0.026 to 9.

[0104] For example, the values ​​of a / b can be 0.026, 0.027, 0.028, 0.029, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3, 4, 5, 6, 7, 8, and 9, as well as any value between two adjacent values.

[0105] Example 1 of electrode processing equipment like Figures 7 to 15 As shown, this application also provides an electrode processing apparatus, which, according to an embodiment of the processing apparatus of this application, includes a first slitting tool 21 and a second slitting tool 22. As... Figure 14 As shown, the first slitting cutter 21 extends along the first direction X and is used to cut the electrode strip 1000 along the first direction X to form a first slit 1004. The second slitting cutter 22 extends along the second direction Y and is used to cut the electrode strip 1000 along the second direction Y to form a second slit 1003. The first slitting cutter 21 is located upstream of the second slitting cutter 22.

[0106] Furthermore, the first slitting tool 21 and the second slitting tool 22 are in the same station.

[0107] It should be noted that the electrode processing equipment in this embodiment is used to perform the above-described electrode preparation method.

[0108] like Figure 4 and Figure 14 As shown, the first slitting tool 21 is used to perform the first slitting process, and the second slitting tool 22 is used to perform the second slitting process.

[0109] The arrangement of the first slitting cutter 21 and the second slitting cutter 22 has the following advantages: First, in the upstream equipment of the first slitting cutter 21 and the second slitting cutter 22, the electrode strip 1000 is not slit, meaning the integrity of the electrode strip 1000 is not compromised (i.e., the coating area 1001 does not have a long kerf). As a result, the electrode strip 1000 maintains high strength and does not wrinkle or sink during transport, exhibiting good throughput. Consequently, material blockage does not occur at the first slitting cutter 21 and the second slitting cutter 22 during electrode processing.

[0110] Secondly, since the first slitting tool 21 and the second slitting tool 22 are both in the same station, as long as the relative positional accuracy of the first slitting tool 21 and the second slitting tool 22 is maintained, the relative positional accuracy of the first slit 1004 and the second slit 1003 can be guaranteed. Even if the electrode strip 1000 vibrates during the transfer process, the relative positions of the first slit 1004 and the second slit 1003 will not be affected, so the dimensional consistency of the processed electrode 2000 is good.

[0111] Optionally, the first slitting tool 21 and the second slitting tool 22 are set at 90°, that is, they form a "T" shaped structure.

[0112] like Figure 20 As shown, the first slitting tool 21 can also be located downstream of the second slitting tool 22.

[0113] Optionally, the first cutting tool 21 and the second cutting tool 22 can be used for simultaneous cutting or asynchronous cutting.

[0114] For example, the first cutting tool 21 and the second cutting tool 22 can fall synchronously, that is, the first slit 1004 and the second slit 1003 are formed synchronously.

[0115] For example, the first cutting tool 21 may fall first, followed by the second cutting tool 22, that is, the first slit 1004 may be processed first, and then the second slit 1003 may be processed.

[0116] For example, the second cutting tool 22 may fall first, followed by the first cutting tool 21, that is, the second slit 1003 may be processed first, and then the first slit 1004 may be processed.

[0117] like Figure 14 As shown, in the technical solution of this embodiment, the second cutting tool 22 includes a first cutting segment 221 and a second cutting segment 222 that are spaced apart, and the first cutting tool 21 is located between the first cutting segment 221 and the second cutting segment 222.

[0118] This configuration prevents interference between the end of the first slitting tool 21 and the second slitting tool 22.

[0119] like Figure 4 , Figure 7 and Figure 12 As shown, the technical solution of this embodiment also includes a first cutting mechanism 1 and a second cutting mechanism 2, with the first cutting mechanism 1 located upstream of the second cutting mechanism 2. The first cutting mechanism 1 includes an electrode tab cutting tool 11 and a grooving tool 12. The electrode tab cutting tool 11 is used to cut the electrode tabs 2001, and the grooving tool 12 is used to groove the electrode strip 1000 to form a groove 1005. The second cutting mechanism 2 includes the aforementioned first slitting tool 21 and second slitting tool 22.

[0120] Each cutting mechanism performs two cutting processes. Specifically, in this embodiment, the tab cutting process and the grooving process are both performed in the first cutting mechanism 1. The second slitting process and the first slitting process are both performed in the second cutting mechanism 2.

[0121] The advantage of this design is that the integrity of the electrode strip 1000 is not compromised after passing through the first cutting mechanism 1 (i.e., the coating area 1001 does not have a long slit). Thus, the electrode strip 1000 maintains high strength and will not wrinkle or sink during transfer, resulting in good throughput. This also prevents material blockage at the second cutting mechanism 2 during electrode processing.

[0122] like Figure 4 and Figure 9 As shown, in the technical solution of this embodiment, the first cutting mechanism 1 includes a tab cutting tool 11 and a grooving tool 12. The tab cutting tool 11 is used to perform the tab cutting process, and the grooving tool 12 is used to perform the grooving process.

[0123] That is, during the circulation process, the electrode strip 1000 is first cut by the first cutting mechanism 1. Among them, the electrode tab cutting tool 11 is used to cut the electrode tab 2001, the two electrode tab roots 2002, the first corner 2003 and the second corner 2004, and the first edge 2007. The grooving tool 12 is used to cut the groove 1005.

[0124] Optionally, the tab cutting tool 11 and the grooving tool 12 can be cut simultaneously or asynchronously.

[0125] For example, the tab cutting tool 11 and the grooving tool 12 can fall synchronously, that is, the tab 2001 and the groove 1005 are formed synchronously.

[0126] For example, the tab cutting tool 11 can fall first, followed by the grooving tool 12, that is, the tab 2001 can be machined first, and then the grooving 1005 can be machined.

[0127] For example, the grooving tool 12 can fall first, followed by the tab cutting tool 11, that is, the groove 1005 can be machined first, and then the tab 2001 can be machined.

[0128] In this embodiment, the electrode strip 1000 is cut in the second cutting mechanism 2 after being cut by the first cutting mechanism 1. The first slitting cutter 21 is used to cut the second slit 1003, and the second slitting cutter is used to cut the first slit 1004.

[0129] In this embodiment, all edges, corners and tabs 2001 of the electrode 2000 can be cut by two cutting mechanisms. Therefore, in the cutting method of this embodiment, the overall equipment occupies little space, the process is compact and the sheet production efficiency is high.

[0130] And combined Figure 4 As can be seen, after the electrode strip 1000 passes through the first cutting mechanism 1, the electrode strip 1000 takes the form of having grooves 1005 spaced along the first direction X in the coating area 1001 and tabs 2001 spaced along the first direction in the empty foil area 1002. Since the grooves 1005 are relatively small hole structures, the structure of the coating area 1001 is not damaged by cutting after passing through the first cutting mechanism 1, and the structure remains basically intact.

[0131] During the transfer of the electrode strip 1000 from the first cutting mechanism 1 to the second cutting mechanism 2, the electrode strip 1000 maintains its structural strength and good support, without wrinkling, sinking, or collapsing. Therefore, the electrode strip 1000 will not experience material blockage at the second cutting mechanism 2, thereby improving processing efficiency.

[0132] like Figures 1 to 4 As shown, especially when the dimension a of the electrode 2000 along the first direction X is large, the technical solution of this embodiment can ensure the structural integrity of the electrode strip 1000. The electrode strip 1000 does not wrinkle or sink during the transportation process from the first cutting mechanism 1 to the second cutting mechanism 2, and prevents the electrode strip 1000 from being blocked due to poor flow at the second cutting mechanism 2.

[0133] like Figure 4 and Figure 14As shown, in the second cutting mechanism 2, the first cutting tool 21 extends along the first direction X, and the second cutting tool 22 extends along the second direction Y. During cutting, the two ends of the first cutting tool 21 are respectively located in two adjacent cutting grooves 1005, which means that the first slit 1004 can communicate with the two adjacent cutting grooves 1005. This ensures that the first slit 1004 can completely separate the two adjacent electrode sheets 2000 along the second direction Y. The second cutting tool 22 is along the second direction Y of the electrode strip 1000, and the second cutting tool 22 passes through the cutting grooves 1005, thus ensuring that the second slit 1003 can completely separate the two adjacent electrode sheets 2000 along the first direction X.

[0134] The following details the specific structures of the first cutting mechanism 1 and the second cutting mechanism 2.

[0135] like Figures 7 to 11 As shown, in this embodiment, the first cutting mechanism 1 further includes a first lower die base 13 and a first upper die base 14. The first lower die base 13 is provided with a first cutter holder 15, which has a first cutter groove 151 corresponding to the tab cutting tool 11 and a second cutter groove 152 corresponding to the grooving tool 12. The tab cutting tool 11 and the first cutter groove 151 are both symmetrically arranged along the second direction Y. The grooving tool 12 is disposed between the two tab cutting tools 11, and the second cutter groove 152 is disposed between the two first cutter grooves 151.

[0136] Specifically, the first lower die holder 13 and the first upper die holder 14 are arranged along the third direction Z, and the tab cutting tool 11 and the grooving tool 12 are both arranged on the first upper die holder 14. When the first upper die holder 14 moves toward the first lower die holder 13 once, one cutting is completed.

[0137] from Figure 8 As can be seen, a first cutter holder 15 is also provided on the first lower die holder 13, and a first cutter groove 151 and a second cutter groove 152 are provided on the first cutter holder 15. The position and shape of the first cutter groove 151 are adapted to the tab cutting tool 11, and the position and shape of the second cutter groove 152 are adapted to the grooving tool 12. During cutting, the lower end of the tab cutting tool 11 extends into the first cutter groove 151, and the lower end of the grooving tool 12 extends into the second cutter groove 152. This ensures that both the tab cutting tool 11 and the grooving tool 12 can penetrate the electrode strip 1000, thereby ensuring the cutting quality.

[0138] from Figure 9As can be seen, in this embodiment, two tab cutting tools 11 are provided, and the two tab cutting tools 11 are used to cut the empty foil areas 1002 on both sides of the coating area 1001. The grooving tool 12 is located in the middle position between the two tab cutting tools 11. Correspondingly, two first cutting grooves 151 are provided, and the positions of the two first cutting grooves 151 correspond to the two tab cutting tools 11.

[0139] Furthermore, this embodiment also provides an electrode tab cutting tool, the electrode tab cutting tool 11 having the following specific structure: Figure 11 As shown, the tab cutting tool 11 includes a first edge 111, a second edge 112, a third edge 113, and a fourth edge 114. (Combined) Figure 5 As shown, the first edge 111 and the second edge 112 are used to cut the root of the electrode tab 2002, and the third edge 113 and the fourth edge 114 are used to cut the first corner 2003 and the second corner 2004 of the electrode sheet 2000 facing the electrode tab 2001, respectively.

[0140] That is, after the electrode strip 1000 passes through the first cutting mechanism 1, the electrode cutting blade 11 can cut the electrode tab 2001, the two electrode tab roots 2002, the first side 2007, the first corner 2003, and the second corner 2004. Further, the first cutting mechanism 1 is provided with two electrode cutting blades 11, which respectively cut the electrode tab 2001, the two electrode tab roots 2002, the first side 2007, the first corner 2003, and the second corner 2004 of the two electrodes 2000 that are opposite each other along the second direction Y.

[0141] More specific structure of the tab cutting tool 11 is as follows: Figure 11 As shown, the tab cutting tool 11 is rectangular and faces the direction between the two tab cutting tools 11 (that is, the middle of the first cutting mechanism 1). The two corners of the tab cutting tool 11 along the first direction X form the first edge 111 and the second edge 112, respectively.

[0142] Furthermore, in the direction between the two tab cutting blades 11 (that is, in the middle of the first cutting mechanism 1), a protruding structure 1103 is provided on the side of the tab cutting blade 11. The two sides of the protruding structure 1103 form a third edge 113 and a fourth edge 114 respectively, and the top of the protruding structure 1103 forms a fifth edge 115.

[0143] Specifically, the first edge 111, the second edge 112, the third edge 113, and the fourth edge 114 mentioned above are all located on the same side of the tab cutting tool 11, that is... Figure 11The lower side is shown. A first edge 111 and a second edge 112 are formed at the two corners of the electrode cutting tool 11. A protruding structure 1103 is also provided on the lower edge of the electrode cutting tool 11. The distance from the protruding structure 1103 to the second edge 112 is less than the distance from the protruding structure 1103 to the first edge 111. And from... Figure 11 As can be seen, of the two sides of the protruding structure 1103, the side facing the first edge 111 forms the fourth edge 114, and the side facing the second edge 112 forms the third edge 113.

[0144] Based on the above structure, those skilled in the art can understand that for the same electrode 2000, during the process of two step-cutting steps by the first cutting mechanism 1: in the first cutting, the electrode cutting tool 11 cuts one electrode root 2002 and the first corner 2003; in the second cutting, the electrode cutting tool cuts the other electrode root 2002 and the second corner 2004.

[0145] Furthermore, since vibrations may occur during the flow of the electrode strip 1000, there may be a positional deviation of the electrode strip 1000 at the first cutting mechanism 1. By providing the protruding structure 1103 and the fifth edge 115, the electrode tab cutting tool 11 can cut an additional portion of the electrode strip 1000. Specifically, in addition to cutting the first corner 2003 and the second corner 2004 of the electrode 2000 through the third edge 113 and the fourth edge 114, the protruding structure 1103 can also cut an additional portion downwards through the fifth edge 115.

[0146] By setting the protruding structure 1103, the "uneven shoulders" situation (that is, the first corner 2003 and the second corner 2004 of different electrodes 2000 are not aligned) can be prevented. In this way, the alignment accuracy of multiple electrodes 2000 can be guaranteed during the subsequent stacking process, and the stacking effect can be improved.

[0147] Optionally, the cross-section of the grooving tool 12 can be polygonal, circular, or elliptical. Those skilled in the art will understand that the shape of the groove 1005 is adapted to the cross-sectional shape of the grooving tool 12.

[0148] like Figure 19 As shown, the cross-section of the grooving tool 12 can be of different shapes.

[0149] For example, in Figure 19 (a) shows that the cross-section of the grooving tool 12 is triangular.

[0150] For example, in Figure 19 (b) shows that the cross-section of the grooving tool 12 is circular. The cross-section of the grooving tool 12 can also be elliptical.

[0151] For example, in Figure 19 (c) shows that the cross-section of the grooving tool 12 is trapezoidal. The cross-section of the grooving tool 12 can also be a truncated trapezoid.

[0152] For example, in Figure 19 (d) shows that the cross-section of the grooving tool 12 is square.

[0153] For example, in Figure 19 (e) shows that the cross-section of the grooving tool is rectangular.

[0154] like Figure 9 As shown, in the technical solution of this embodiment, the cross-section of the grooving tool 12 is rhomboid, and the grooving tool 12 as a whole has a columnar structure.

[0155] In some embodiments not shown, the interface of the grooving tool 12 may also be triangular, quadrilateral, or have more sides.

[0156] like Figure 10 As shown, in the technical solution of this embodiment, when the cross-section of the grooving tool 12 is polygonal, a transition section 121 is provided between adjacent sides, and the transition section 121 is a straight line or an arc.

[0157] Specifically, the function of the transition section 121 is that, in the second cutting mechanism 2, when the electrode strip 1000 vibrates and causes a positional deviation, the transition section 121 can absorb the positional deviation, that is, the cutting tool cuts onto the transition section 121, thereby ensuring the integrity of the bevel at the corner of the electrode 2000.

[0158] Those skilled in the art will understand that the transition section 121 of the grooving tool 12 is used to cut the aforementioned compensation section 10051.

[0159] Combination Figure 6 and Figure 10 As shown, on the cross-section of the grooving cutter 12, the two bevels on one side of the first direction X are used to cut the third corner 2005 of the two opposite pole pieces along the second direction Y. The two bevels on the other side of the first direction X are used to cut the fourth corner 2006 of the two opposite pole pieces along the second direction Y.

[0160] Furthermore, such as Figure 6 As shown, on the cross-section of the grooving tool 12, two adjacent inclined sides can be connected by an arc transition section 121, a straight transition section 121, or an irregularly shaped transition section 121.

[0161] Combination Figure 6 and Figure 10 As shown, when the electrode strip 1000 vibrates in the second direction Y, the transition section 121 located on both sides of the first direction X compensates for and absorbs the positional deviation, that is, the first cutting tool 21 cuts within the range of the transition section 121 located on both sides of the first direction X.

[0162] Furthermore, combined Figure 6 and Figure 10 As shown, when the electrode strip 1000 vibrates in the first direction X, the transition sections 121 located on both sides of the second direction Y compensate for and absorb the positional deviation, that is, the second cutting tool 22 cuts within the range of the transition sections 121 located on both sides of the second direction Y.

[0163] Furthermore, another structural form of the tab cutting tool 11 is as follows: Figure 15 As shown, the tab cutting tool 11 includes a first cutting block 1101 and a second cutting block 1102 spaced apart along a first direction X. On the opposite side of the first cutting block 1101 and the second cutting block 1102, and in the direction between the two tab cutting tools 11, a first edge 111 is formed at the corner of the first cutting block 1101, and a second edge 112 is formed at the corner of the second cutting block 1102.

[0164] Specifically, Figure 15 The electrode cutting tool 11 shown consists of two separate structures, namely a first cutting block 1101 and a second cutting block 1102. Furthermore, along the first direction X, the length of the first cutting block 1101 is greater than the length of the second cutting block 1102. Along the second direction Y, the width of the first cutting block 1101 is equal to the width of the second cutting block 1102.

[0165] Furthermore, on the side of the first cut 1101 facing the second cut 1102, a first edge 111 is formed at the inner corner of the first cut 1101. On the side of the second cut 1102 facing the first cut 1101, a second edge 112 is formed at the inner corner of the second cut 1102.

[0166] like Figure 15 As shown, in the technical solution of this embodiment, a protruding structure 1103 is provided on the side of the second cutting block 1102 in the direction between the two tab cutting tools 11. The protruding structure 1103 and the edge of the second cutting block 1102 away from the first cutting block 1101 have a distance c.

[0167] The structure and function of the protrusion 1103 Figure 11 The protruding structure 1103 shown has the same function, so it will not be described again.

[0168] from Figure 15As can be seen, along the first direction X, the distance from the protrusion 1103 to the edge of the second cut 1102 facing the first cut 1101 is greater than the distance from the protrusion 1103 to the edge of the second cut 1102 away from the first cut 1101 (distance shown as c in the figure).

[0169] Furthermore, due to the position of the edge of the protruding structure 1103 electrode plate during the cutting process, the portion between the protruding structure 1103 and the edge of the second cut block 1102 that is away from the edge of the first cut block 1101 (i.e., Figure 15 The range marked with 'c' can cut an additional portion of the empty foil area 1002 of the adjacent electrode 2000, thereby eliminating the influence of positional deviation caused by the vibration of the electrode strip 1000.

[0170] like Figure 15 As shown, in the technical solution of this embodiment, for the protruding structure, the third edge 113 is located on the side of the protruding structure 1103 facing the first cutting block 1101, and the fourth edge 114 is located on the side of the protruding structure 1103 away from the first cutting block 1101. The second cutting block 1102 also includes a sixth edge 116, which is located on the side of the protruding structure 1103 away from the first cutting block 1101. The sixth edge 116 is connected to the fourth edge 114, and the sixth edge 116 is inclined in a direction away from the two tab cutting tools 11.

[0171] Specifically, the function of the sixth edge 116 is to avoid the first edge 2007 of the downstream electrode 2000 during cutting, so as to prevent the first edge 2007 of the downstream electrode 2000 from being damaged.

[0172] like Figures 12 to 14 As shown, in this embodiment, the second cutting mechanism 2 further includes a second lower mold base 23 and a second upper mold base 24. A second cutter holder 25 is provided on the second lower mold base 23, and a third cutter groove 251 corresponding to the first cutting cutter 21 is provided on the second cutter holder 25. The first cutting cutter 21 extends along a first direction X, and the second cutting cutter 22 extends along a second direction Y. The first cutting cutter 21 and the second cutting cutter 22 are perpendicularly arranged, and the second cutting cutter 22 is located downstream of the first cutting cutter 21.

[0173] like Figure 20 As shown, the second cutting tool 22 can also be located upstream of the first cutting tool 21.

[0174] Specifically, the second lower mold base 23 and the second upper mold base 24 are arranged along the third direction Z, and the first cutting tool 21 and the second cutting tool 22 are both arranged on the second upper mold base 24. When the second upper mold base 24 moves toward the second lower mold base 23 once, one cutting is completed.

[0175] from Figure 13 As can be seen, a second cutter holder 25 is also provided on the second lower die holder 23, and a third cutter groove 251 is provided on the second cutter holder 25. The position and shape of the third cutter groove 251 are adapted to the first slitting cutter 21. During cutting, the lower end of the first slitting cutter 21 extends into the second cutter groove 152. This ensures that the first slitting cutter 21 can penetrate the electrode strip 1000, thereby ensuring the cutting quality.

[0176] from Figure 14 As can be seen, the second slitting cutter 22 extends along the second direction Y, and the first slitting cutter 21 extends along the first direction X, with the first slitting cutter 21 located in the middle of the second slitting cutter 22. Therefore, the first slitting cutter 21 and the second slitting cutter 22 form a T-shaped structure.

[0177] Those skilled in the art will understand that the second cutting tool 22 only needs to cooperate with the edge of the first tool holder 15 during cutting, so the first tool holder 15 does not need to be provided with a tool groove to cooperate with the second cutting tool 22.

[0178] Combination Figure 4 As can be seen, in the second cutting mechanism, along the first direction X, the two ends of the first cutting tool 21 fall into the range of the two cutting grooves 1005 respectively, thereby ensuring that the two adjacent pole pieces 2000 along the first direction X can be completely cut and separated.

[0179] like Figure 4 and Figure 14 As shown, along the first direction X, there is a gap between the end of the first slitting tool 21 facing the second slitting tool 22 and the second slitting tool 22. This prevents interference between the first slitting tool 21 and the second slitting tool 22.

[0180] Combination Figure 4 The first cutting tool 21 is inserted into the groove 1005 at the end facing the first cutting tool 21, and the second cutting tool 22 passes through the same groove 1005. In this way, even with a gap between the first cutting tool 21 and the second cutting tool 22, it is still possible to cut and separate adjacent electrode sheets 2000.

[0181] like Figure 14 As shown above, the second slitting tool 22 includes a first cutting segment 221 and a second cutting segment 222 spaced apart, with the first slitting tool 21 located between the first cutting segment 221 and the second cutting segment 222. Specifically, both the first cutting segment 221 and the second cutting segment 222 extend along the second direction Y, and are arranged along the second direction Y.

[0182] Those skilled in the art will understand that when a cutting tool is used, the shearing force at the tip of the tool can easily cause the material to wrinkle. Combined with... Figure 4 and Figure 14 As can be seen, in this embodiment, the end of the first slitting cutter 21 facing the second slitting cutter 22, and the ends of the first cutting segment 221 and the second cutting segment 222 facing each other, are all located within the same hollow area of ​​the cutting groove 1005. Thus, the ends of the first slitting cutter 21 and the second slitting cutter 22 will not cut the coating area 1001 of the electrode strip 1000, preventing wrinkling of the electrode 2000 and reducing the risk of subsequent electrode 2000 loss.

[0183] This embodiment also provides an electrode processing device. The electrode processing device includes an upper die base and a lower die base, wherein a conveyor belt 3 is provided on the lower die base. The conveyor belt 3 supports the electrode material strip 1000 and can drive the electrode material strip 1000 to move. Further, a tool holder is provided on the lower die base, and a cutting tool is provided on the upper die base. One part of the electrode material strip 1000 is supported by the tool holder, and the other part is supported by the conveying surface of the conveyor belt.

[0184] like Figure 16 As shown, in this embodiment, the second cutting mechanism 2 further includes a conveyor belt 3 mounted on the second lower die base 23, and the conveyor belt 3 is provided with suction holes 301. Specifically, the conveyor belt 3 can increase the throughput of the electrode material strip 1000, thereby preventing material blockage.

[0185] Specifically, the conveying surface of the conveyor belt 3 serves as a support surface, providing support for the electrode material strip 1000. That is, in the second cutting mechanism 2, part of the electrode material strip 1000 is supported by the second cutter holder 25, and the other part is supported by the conveying surface of the conveyor belt 3.

[0186] Optionally, two conveyor belts 3 can be provided, spaced apart along the second direction Y. The gap between the two conveyor belts 3 is used to avoid the first slitting cutter 21. In this way, during cutting, the first slitting cutter 21 can extend downward into the third cutter groove 251 through the gap between the two conveyor belts 3.

[0187] Optionally, the conveyor belt 3 is provided with multiple adsorption holes 301, which can be connected to an external vacuum device to create a negative pressure adsorption force on the surface of the conveyor belt 3. In this way, the electrode material belt 1000 can be moved synchronously as the conveyor belt 3 moves.

[0188] Optionally, the conveyor belt 3 can be configured to be lifting. This prevents structural interference when disassembling the second cutting mechanism 2 and allows for easy removal of the conveyor belt. Specifically, when the second cutting mechanism 2 is cutting, the conveyor belt 3 is in a lowered position, supporting and transporting the electrode material strip 1000. When disassembly of the second cutting mechanism 2 is required, the conveyor belt 3 is in an raised position, allowing it to avoid other structures and facilitating the separation of each component.

[0189] Optionally, a conveyor belt 3 may be provided on the first cutting mechanism 1, or both the first cutting mechanism 1 and the second cutting mechanism 2 may be provided with conveyor belts 3.

[0190] Preferably, such as Figure 20 As shown, when the second cutting blade 22 is located upstream of the first cutting blade 21, a conveyor belt 3 is provided on the second cutting mechanism 2. Specifically, in this configuration, after the second cutting mechanism 2 completes one cut, the electrode sheet 2000 at the workstation has been completely cut off from the upstream electrode sheet material belt 1000. Therefore, the driving force upstream of the second cutting mechanism 2 can no longer drive the electrode sheet 2000 downstream. The cut electrode sheet 2000 is only transferred downstream by other means, such as by being gripped by the suction cup of a robotic arm.

[0191] Therefore, as Figure 20 As shown, two conveyor belts 3 are configured, located on either side of the first slitting cutter 21 in the second direction Y, and downstream of the second slitting cutter 22. Thus, the two conveyor belts 3 provide conveying power to the two cut electrode sheets 2000, allowing the electrode sheets 2000 to be transported to the downstream station via the conveyor belts 3 after being completely disconnected from the upstream electrode material belt 1000.

[0192] Example 2 of electrode processing equipment like Figure 17 and Figure 18 As shown, according to Embodiment 2 of the electrode sheet manufacturing method of this application, the difference from Embodiment 1 above is that the structure of the first cutting mechanism 1 is different, and the relative positions of the electrode tab cutting tool 11 and the grooving tool 12 are not fixed.

[0193] Specifically, in embodiment two, there are two tab cutting tools 11, which are distributed along the second direction Y. A grooving tool 12 is located between the two tab cutting tools 11. At least one tab cutting tool 11 is movably disposed along the second direction Y.

[0194] In this embodiment, the tab cutting blade 11 is movably disposed, and the distance between the two tab cutting blades 11 can be changed by changing the position of the tab cutting blade 11. In this way, the first cutting mechanism 1 can be adapted to the cutting of electrode sheets 2000 with different widths (i.e., dimensions along the second direction Y).

[0195] In this embodiment, both tab cutting blades 11 are movably configured. Furthermore, the two tab cutting blades 11 can move independently or synchronously. In the embodiment where the two tab cutting blades 11 move synchronously, they can move closer to each other or move further apart.

[0196] For example, when the width of the electrode strip 1000 is large, the distance between the two electrode cutting tools 11 is increased by moving the electrode cutting tool 11. When the width of the electrode strip 1000 is small, the distance between the two electrode cutting tools 11 is decreased by moving the electrode cutting tool 11.

[0197] Thus, when the width of the electrode strip 1000 is different, there is no need to replace or disassemble the first cutting mechanism 1. The width of the electrode strip 1000 can be adapted by adjusting the size of the electrode tab cutting tool 11.

[0198] In some embodiments not shown, one electrode cutting tool 11 may be movably mounted, while the other electrode cutting tool 11 may be fixed. In this embodiment, two sets of electrode sheets 2000 with different width specifications can be processed along the second direction Y.

[0199] It should be noted that when the width of the electrode strip 1000 changes, the second cutting blade 22 of different lengths can be replaced in the second cutting mechanism 2 accordingly.

[0200] In Embodiment 2, the further specific structure of the first cutting mechanism 1 is as follows: Figure 17 and Figure 18 As shown, the first cutting mechanism 1 further includes a base 16, two first cutting sections 17, a second cutting section 18, and a drive structure. The base 16 is provided with a guide rail 161 extending along the second direction Y. The two first cutting sections 17 are movably mounted on the guide rail 161 and are distributed along the second direction Y. Two tab cutting tools 11 are respectively mounted on the two first cutting sections 17. The second cutting section 18 is mounted on the base 16 and located between the two first cutting sections 17. A grooving tool 12 is mounted on the second cutting section 18. The drive structure is mounted on the base 16 and drives the two first cutting sections 17 to move closer to each other or to move further apart.

[0201] Specifically, the base 16 serves to support the two first cutting sections 17 and the second cutting section 18. A guide rail 161 is provided on the upper surface of the base 16.

[0202] Furthermore, the two first cutting sections 17 and the second cutting section 18 are independently configured, and all three include a lower die base and an upper die base. In one of the first cutting sections 17, the upper die base is provided with a tab cutting tool 11, and the lower die base is provided with a first cutting groove 151 corresponding to the tab cutting tool 11. In the second cutting section 18, the upper die base is provided with a grooving tool 12, and the lower die base is provided with a second cutting groove 152 corresponding to the grooving tool 12.

[0203] The structure of the tab cutting tool 11 can be referenced from [reference needed]. Figure 11 The structure of the middle electrode cutting tool 11 can be referenced. Figure 15 The structure of the middle electrode cutting tool 11.

[0204] Furthermore, the grooving tool 12 can be used to cut the groove 1005. The grooving tool 12 can be referenced. Figure 10 The structure of the center punching tool can be referenced. Figure 19 Other forms of the center punching tool 12.

[0205] like Figure 18 As shown, a slider is provided at the bottom of the first cutting section 17, and the slider cooperates with the guide rail 161. Therefore, the first cutting section 17 as a whole can move on the guide rail 161, that is, move along the second direction Y. The bottom of both first cutting sections 17 is provided with sliders, so both first cutting sections 17 can slide on the guide rail 161, and the two first cutting sections 17 are located on both sides of the guide rail 161.

[0206] Furthermore, the drive structure drives the two first cutting sections 17 to move synchronously, including moving the two first cutting sections 17 closer to each other and moving the two first cutting sections 17 further apart. In this way, it can be ensured that the second cutting section 18 is always located in the middle position of the two first cutting sections 17, and the position adjustment of the two first cutting sections 17 is more flexible.

[0207] In one embodiment, a single drive structure can be provided. In this embodiment, a lead screw is provided on the base 16, and the first cutting part 17 is connected to the lead screw through a threaded hole. The threaded hole can be provided on the slider at the bottom of the first cutting part 17, or at another location on the first cutting part 17. The threads of the two first cutting parts 17 have opposite directions of rotation. The drive structure includes a motor, and the motor shaft drives the lead screw to rotate. Thus, when the motor rotates forward or reverse, it can drive the two first cutting parts 17 to move closer to each other, or drive the two first cutting parts 17 to move further away from each other.

[0208] In one embodiment, two drive structures can be configured, which may include linear motors, cylinders, electric cylinders, hydraulic cylinders, etc. The drive ends of the two drive structures are respectively connected to the two first cutting parts 17. When the drive ends of the drive structures extend or retract, they can drive the first cutting parts 17 to move on the guide rail 161.

[0209] like Figure 21 and Figure 22 As shown, this application also provides an electrode sheet including an electrode sheet body 4 and a notched corner structure 5. The electrode sheet body 4 includes two opposing first sides 41 and two opposing second sides 42. At least one first side 41 is provided with an electrode tab 2001, and adjacent first sides 41 and adjacent second sides 42 form a corner 43. The notched corner structure 5 is disposed at the corner 43, and the outline of the notched corner structure 5 includes a body segment 51 and a buffer segment 52. At least one end of the body segment 51 is provided with the buffer segment 52, and a predetermined angle exists between the body segment 51 and the buffer segment 52.

[0210] It should be noted that the electrode sheet in this embodiment is processed using the above-described sheet-making method. Furthermore, the electrode sheet in this embodiment is processed using the above-described electrode sheet processing equipment.

[0211] Specifically, the structure of electrode body 4 can be referred to Figure 1 The electrode 2000 is shown. The two first sides 41 are respectively first side 2007 and second side 2008. The two second sides 42 are respectively third side 2009 and fourth side 2010. The electrode body 4 has four corners 43, namely first corner 2003, second corner 2004, third corner 2005, and fourth corner 2006. Two of these corners 43 are vertex corners, namely first corner 2003 and second corner 2004, and the other two corners 43 are base corners, namely third corner 2005 and fourth corner 2006.

[0212] Furthermore, the notched corner structure 5 refers to the cutting of the corner 43 of the electrode body 4, so that a portion of the material at the corner 43 is missing. Those skilled in the art will understand that the notched corner structure 5 is formed by cutting with the aforementioned grooving tool 12.

[0213] Furthermore, the outline of the notched structure 5 includes a body segment 51 and a buffer segment 52. The function of the buffer segment is that, in the second cutting mechanism 2, when the electrode strip 1000 vibrates and causes a positional deviation, the buffer segment 52 can absorb the positional deviation, that is, the cutting tool cuts onto the buffer segment 52, thereby ensuring the integrity of the body segment 51 of the electrode body 4.

[0214] like Figure 22As shown, in the technical solution of this embodiment, buffer sections 52 are provided at both ends of the main body section 51, one buffer section 52 is connected to the first side 41, and the other buffer section 52 is connected to the second side 42.

[0215] Furthermore, in this embodiment, buffer sections 52 are provided at the two corners 43 of the bottom corner of the electrode body 4. That is, buffer sections 52 are provided at the corners 2005 and 2006 of the third corner.

[0216] from Figure 22 As can be seen, in the two buffer segments 52 at the same missing corner structure 5, one buffer segment 52 extends along the first direction X, and the other buffer segment 52 extends along the second direction Y. Combined with... Figure 10 Those skilled in the art will understand that the buffer section 52 is formed by cutting the transition section 121 of the grooving tool 12.

[0217] Combination Figure 14 and Figure 22 As shown, when the electrode strip 1000 vibrates in the second direction Y, the buffer section 52 extending in the second direction Y compensates for and absorbs the positional deviation, that is, the first cutting tool 21 cuts within the range of the buffer section 52 extending in the second direction Y.

[0218] Furthermore, combined Figure 14 and Figure 22 As shown, when the electrode strip 1000 vibrates in the first direction X, the buffer section 52 extending along the first direction X compensates for and absorbs the positional deviation, that is, the second cutting tool 22 cuts within the range of the buffer section 52 extending along the first direction X.

[0219] In this way, regardless of the direction of vibration deviation of the electrode strip 1000, the integrity of the body segment 51 of the missing corner structure 5 can be guaranteed.

[0220] In some embodiments not shown, only one buffer segment 52 may be provided at the same corner structure 5. This could be either a single buffer segment 52 connected to the first side 41 or a single buffer segment 52 connected to the second side 42.

[0221] In some embodiments not shown, the buffer section 52 may be provided only on one corner 43 of the missing corner structure 5; or the buffer section 52 may be provided on three corners 43 of the missing corner structure 5; or the buffer section 52 may be provided on all four corners 43 of the missing corner structure 5.

[0222] In some embodiments not shown, buffer sections 52 may be provided at the two corners 43 of the electrode body 4 located at the top corner. That is, buffer sections 52 are provided at the corners 2003 and 2004 of the first corner.

[0223] like Figure 22 As shown, in the technical solution of this embodiment, of the two buffer sections 52, the buffer section 52 closer to the first side 41 is perpendicular to the first side 41, and the buffer section 52 closer to the second side 42 is perpendicular to the second side 42. Of course, the buffer section 52 and the first side 41 can also be at other angles, and the buffer section 52 and the second side 42 can also be at other angles.

[0224] like Figure 21 As shown, in the technical solution of this embodiment, both the body segment 51 and the buffer segment 52 are straight lines, and the body segment 51 and the buffer segment 52 are smoothly connected.

[0225] Preferably, when the buffer section 52 is a straight line, the buffer section extending along the first direction X is perpendicular to the second side 42. In this case, when the electrode strip experiences vibration deviation in the X direction, the cutting position formed by the second slitting tool 22 on the buffer section 52 remains consistent in the second direction Y, which helps to ensure the alignment between electrodes during subsequent stacking.

[0226] More preferably, when the buffer section 52 is a straight line, the buffer section extending along the second direction Y is perpendicular to the first side 41. In this case, when the electrode strip experiences a vibration deviation in the Y direction, the cutting position formed by the first slitting tool 21 on the buffer section 52 remains consistent in the first direction X, which helps to ensure the alignment between the electrodes during subsequent stacking.

[0227] Alternatively, the body segment 51 and the buffer segment 52 can also be connected by a sharp corner, that is, a non-smooth transition connection.

[0228] In some embodiments not shown, the body segment 51 may also be an arc or other irregular contour.

[0229] In some embodiments not shown, the buffer segment 52 may also be an arc or other irregular contour.

[0230] like Figure 22 As shown, in the technical solution of this embodiment, the angle d between the body segment 51 and the buffer segment 52 is in the range of 110° to 170°.

[0231] For example, the angle d between the body segment 51 and the buffer segment 52 can be selected as 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165° or 170°, etc., as well as any value between the two values.

[0232] Furthermore, such as Figure 22 As shown, in this embodiment, the angle between the body segment 51 and the two buffer segments 52 is the same. In some embodiments not shown, the angle between the body segment 51 and the two buffer segments 52 may also be different.

[0233] This application also provides a battery cell, wherein the battery cell includes a casing and a cell disposed within the casing. The cell is formed by stacking a positive electrode, a negative electrode, and a separator. The positive electrode can be one of the aforementioned electrodes, and / or the negative electrode can be one of the aforementioned electrodes.

[0234] This application also provides an electrical device, which includes the aforementioned battery cell.

[0235] This application also provides a battery pack, wherein the battery pack includes a housing and a battery module disposed within the housing, the battery module including the aforementioned individual battery cells.

[0236] This application also provides a vehicle that includes the aforementioned battery cell or battery pack.

[0237] Alternatively, the vehicle can be a gasoline-powered vehicle or a new energy vehicle.

[0238] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for preparing an electrode sheet, characterized in that, include: In the first slitting process, the electrode strip (1000) is cut along the first direction (X) to form the first slit (1004). In the second slitting process, the electrode strip (1000) is cut along the second direction (Y) to form a second slit (1003). The first slitting process and the second slitting process are carried out at the same station, and the electrode strip (100) is formed into a pair of electrodes (2000) arranged along the second direction (Y).

2. The film preparation method according to claim 1, characterized in that, Also includes: The tab cutting process involves cutting and forming tabs (2001) in the empty foil area (1002) of the electrode strip (1000), and the tab cutting process is performed before the first slitting process and the second slitting process.

3. The film preparation method according to claim 2, characterized in that, Also includes: The grooving process forms grooves (1005) on the electrode strip (1000), and the grooving process is performed before the first slitting process and the second slitting process. The first slit (1004) connects two adjacent slits (1005), and the second slit (1003) penetrates the slit (1005).

4. The film preparation method according to claim 3, characterized in that, The tab cutting process and the grooving process are performed at the same workstation.

5. The film preparation method according to claim 3, characterized in that, Also includes: The feeding process includes causing the electrode strip (1000) to flow along a first direction (X) and causing the electrode strip (1000) to pass through a first cutting mechanism (1) and a second cutting mechanism (2) in sequence. The electrode tab cutting process and the grooving process are performed in the first cutting mechanism (1), and the first slitting process and the second slitting process are performed in the second cutting mechanism (2).

6. The film preparation method according to any one of claims 1 to 5, characterized in that, Along the first direction (X), the size (a) of the electrode (2000) is in the range of 40 mm to 450 mm; and / or, along the second direction (Y), the size (b) of the electrode (2000) is in the range of 50 mm to 1500 mm.

7. The film preparation method according to any one of claims 1 to 5, characterized in that, The ratio of dimension a of the electrode (2000) along the first direction (X) to dimension b of the electrode (2000) along the second direction (Y) is in the range of 0.026 to 9.

8. The film preparation method according to any one of claims 1 to 5, characterized in that, The electrode strip (1000) includes a coating area (1001) and two empty foil areas (1002) distributed along a second direction (Y) on both sides of the coating area (1001).

9. The film preparation method according to claim 3, characterized in that, The groove (1005) is polygonal, circular, or elliptical.

10. The film preparation method according to claim 9, characterized in that, The cut groove (1005) is polygonal, and a compensation segment (10051) connects adjacent sides.

11. A processing device for electrode sheets, characterized in that, include: The first cutting tool (21) extends along the first direction (X) and is used to cut the electrode strip (1000) along the first direction (X) to form a first slit (1004). The second cutting tool (22) extends along the second direction (Y) and cuts the electrode strip (1000) along the second direction (Y) to form a second slit (1003). The first cutting tool (21) is located upstream or downstream of the second cutting tool (22). The first slitting tool (21) and the second slitting tool (22) are in the same station.

12. The processing equipment according to claim 11, characterized in that, The second cutting tool (22) includes a first cutting segment (221) and a second cutting segment (222) spaced apart, with the first cutting tool (21) located between the first cutting segment (221) and the second cutting segment (222).

13. The processing equipment according to claim 11 or 12, characterized in that, It also includes a first cutting mechanism (1) and a second cutting mechanism (2), wherein the first cutting mechanism (1) is located upstream or downstream of the second cutting mechanism (2). The first cutting mechanism (1) includes an electrode cutting tool (11) and a grooving tool (12). The electrode cutting tool (11) is used to cut the electrode (2001), and the grooving tool (12) is used to groove the electrode strip (1000). The second cutting mechanism (2) includes the first cutting tool (21) and the second cutting tool (22).

14. The processing equipment according to claim 13, characterized in that, The first cutting mechanism (1) further includes a first lower die base (13) and a first upper die base (14). The first lower die base (13) is provided with a first cutter holder (15). The first cutter holder (15) is provided with a first cutter groove (151) corresponding to the tab cutting tool (11) and a second cutter groove (152) corresponding to the grooving tool (12). The tab cutting tool (11) and the first cutter groove (151) are two symmetrically arranged along the second direction (Y). The grooving tool (12) is arranged between the two tab cutting tools (11) and the second cutter groove (152) is arranged between the two first cutter grooves (151).

15. The processing equipment according to claim 13, characterized in that, The cross-section of the grooving tool (12) is polygonal, circular or elliptical.

16. The processing equipment according to claim 15, characterized in that, The cross-section of the grooving tool (12) is polygonal, and a transition section (121) is provided between adjacent sides. The transition section (121) is a straight line or an arc.

17. The processing equipment according to claim 13, characterized in that, The second cutting mechanism (2) further includes a second lower mold base (23) and a second upper mold base (24). The second lower mold base (23) is provided with a second knife holder (25). The second knife holder (25) is provided with a third knife groove (251) corresponding to the first cutting tool (21). The first cutting tool (21) is perpendicular to the second cutting tool (22), and the first cutting tool (21) is located upstream or downstream of the second cutting tool (22).

18. The processing equipment according to claim 14, characterized in that, The electrode cutting tool (11) includes a first edge (111), a second edge (112), a third edge (113), and a fourth edge (114). The first edge (111) and the second edge (112) are used to cut the root of the electrode (2002). The third edge (113) and the fourth edge (114) are used to cut the first corner (2003) and the second corner (2004) of the electrode (2000) facing the electrode (2001), respectively. The grooving tool (12) is used to cut the third corner (2005) and the fourth corner (2006) of the electrode (2000) facing away from the electrode (2001).

19. The processing equipment according to claim 18, characterized in that, The tab cutting tool (11) includes a protrusion structure (1103), the roots on both sides of the protrusion structure (1103) form the third edge (113) and the fourth edge (114), and the top of the protrusion structure (1103) forms the fifth edge (115).

20. The processing equipment according to claim 19, characterized in that, The protrusion structure (1103) of the two tab cutting tools (11) and the grooving tool (12) are arranged in a collinear manner.

21. The processing equipment according to claim 19, characterized in that, The tab cutting tool (11) includes a first cutting block (1101) and a second cutting block (1102) spaced apart along the first direction (X). On the opposite side of the first cutting block (1101) and the second cutting block (1102), and in the direction between the two tab cutting tools (11), the first edge (111) is formed at the corner of the first cutting block (1101), and the second edge (112) is formed at the corner of the second cutting block (1102).

22. The processing equipment according to claim 21, characterized in that, In the direction between the two tab cutting tools (11), the second cutting block (1102) is provided with the protrusion structure (1103) on its side, and the protrusion structure (1103) is spaced (c) from the edge of the second cutting block (1102) away from the first cutting block (1101).

23. The processing equipment according to claim 22, characterized in that, The second cut (1102) also includes a sixth edge (116) at its edge, the sixth edge (116) being located on the side of the protrusion (1103) away from the first cut (1101), the third edge (113) being located on the side of the protrusion (1103) facing the first cut (1101), and the fourth edge (114) being located on the side of the protrusion (1103) away from the first cut (1101). The sixth edge (116) is connected to the fourth edge (114), and the sixth edge (116) is inclined in a direction away from the two tab cutting tools (11).

24. The processing equipment according to claim 19, characterized in that, The tab cutting tool (11) is rectangular. In the direction between the two tab cutting tools (11), the two corners of the tab cutting tool (11) along the first direction (X) form a first edge (111) and a second edge (112).

25. The processing equipment according to claim 24, characterized in that, The protrusion structure (1103) is provided on the side of the two tab cutting tools (11) in the direction between them.

26. The processing equipment according to claim 13, characterized in that, The first cutting mechanism (1) and / or the second cutting mechanism (2) both include a conveyor belt (3), and the conveyor belt (3) is provided with suction holes (301).

27. The processing equipment according to claim 26, characterized in that, The conveyor belt (3) is a liftable structure; and / or, there are two conveyor belts (3), which are spaced apart along the second direction (Y).

28. The processing equipment according to claim 13, characterized in that, There are two tab cutting tools (11), which are distributed along the second direction (Y). The grooving tool (12) is located between the two tab cutting tools (11). At least one tab cutting tool (11) is movably arranged along the second direction (Y).

29. The processing equipment according to claim 28, characterized in that, The first cutting mechanism (1) further includes: A base (16) is provided with a guide rail (161) which extends along the second direction (Y); Both first cutting sections (17) are movably disposed on the guide rail (161). The two first cutting sections (17) are distributed along the second direction (Y). The two tab cutting tools (11) are respectively disposed on the two first cutting sections (17). The second cutting section (18) is disposed on the base (16) and located between the two first cutting sections (17), and the grooving tool (12) is disposed on the second cutting section (18). A drive structure is provided on the base (16) and drives the two first cutting parts (17) to move closer to each other or to move further away from each other.

30. An electrode sheet, characterized in that, include: The electrode body (4) includes two opposing first sides (41) and two opposing second sides (42), at least one of the first sides (41) is provided with an electrode tab (2001), and adjacent first sides (41) and adjacent second sides (42) form a corner (43). A missing corner structure (5) is provided at the corner (43). The outline of the missing corner structure (5) includes a body segment (51) and a buffer segment (52). At least one end of the body segment (51) is provided with the buffer segment (52). There is a preset angle between the body segment (51) and the buffer segment (52).

31. The electrode sheet according to claim 30, characterized in that, The body segment (51) is a straight line or an arc; and / or, the buffer segment (52) is a straight line or an arc.

32. The electrode sheet according to claim 30, characterized in that, Both ends of the body segment (51) are provided with buffer segments (52), one of the buffer segments (52) is connected to the first side (41), and the other buffer segment (52) is connected to the second side (42).

33. The electrode sheet according to claim 32, characterized in that, Of the two buffer sections (52), the buffer section (52) closer to the first side (41) is arranged perpendicular to the first side (41), and the buffer section (52) closer to the second side (42) is arranged perpendicular to the second side (42).

34. The electrode sheet according to any one of claims 30 to 33, characterized in that, Both the body segment (51) and the buffer segment (52) are straight lines, and the body segment (51) and the buffer segment (52) are smoothly connected.

35. The electrode sheet according to any one of claims 30 to 33, characterized in that, The angle (d) between the body segment (51) and the buffer segment (52) is in the range of 110° to 170°.

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