Pole piece die-cutting method

Abstract

This invention provides a method for die-cutting electrode sheets. The method includes conveying an electrode sheet strip along a first direction to the cutting area of ​​an electrode sheet die-cutting device; adjusting the positions of a first laser cutting component and a second laser cutting component of the electrode sheet die-cutting device according to the electrode sheet strip, such that the center point of the first laser galvanometer of the first laser cutting component is located above a preset electrode sheet cutting line, and the center point of the second laser galvanometer of the second laser cutting component is located above the tab area. This increases the laser incident cutting angle of the first laser cutting component and the second laser cutting component, thereby avoiding repeated cutting of the same position and causing severe vaporization of the upper surface material of the tab foil, thus solving the problem of foil leakage caused by laser cutting and reducing the risk of short circuit after the electrode sheet is assembled into a core package.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method for die-cutting electrodes. Background Technology

[0002] Currently, the laser cutting process for wide-width electrode sheets in the lithium battery industry mainly employs multiple lasers. These lasers are positioned above the center line of the electrode sheet, arranged in a straight line, and are responsible for cutting the electrode sheet and the tab cutting areas, respectively. The laser path in this electrode die-cutting process forms an acute angle with the electrode strip. Repeated cutting of the same location on the electrode strip can cause severe vaporization of the upper surface material at the junction of the tab foil and the electrode strip, resulting in significant foil leakage and powder shedding in the cutting area. This greatly increases the risk of short circuits after the electrode is assembled into a core package.

[0003] Therefore, it is necessary to provide a method for die-cutting electrodes to improve this defect. Summary of the Invention

[0004] The embodiments of the present invention provide an electrode die-cutting method that can solve the problem of foil leakage caused by laser cutting and reduce the risk of short circuit after the electrode is assembled into a core package.

[0005] An embodiment of the present invention provides a method for die-cutting electrodes, comprising:

[0006] The electrode strip is conveyed along the first direction to the cutting area of ​​the electrode die-cutting device, wherein the electrode material of the electrode strip is directly opposite the electrode area of ​​the cutting area, and the tab foil of the electrode strip is directly opposite the tab area of ​​the cutting area.

[0007] According to the electrode strip, adjust the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device so that the center point of the first laser galvanometer of the first laser cutting component is located above the preset electrode cutting line, and the center point of the second laser galvanometer of the second laser cutting component is located above the electrode tab area.

[0008] The first laser cutting component is used to reciprocately cut the electrode material along the electrode cutting line to form an electrode, and the second laser cutting component is used to reciprocately cut the electrode foil material along the electrode tab cutting line to form an electrode tab;

[0009] Wherein, the electrode cutting line is parallel to the second direction, the electrode tab cutting line is parallel to the first direction, and the first direction intersects the second direction.

[0010] In one embodiment, the step of adjusting the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device according to the electrode strip includes:

[0011] Obtain the size parameters and position information of the electrode strip, the position information of the first laser cutting component, and the position information of the second laser cutting component;

[0012] Based on the size parameters and position information of the electrode strip, the position information of the first laser cutting component, and the position information of the second laser cutting component, a first distance compensation value of the first laser cutting component along the second direction and a second distance compensation value of the second laser cutting component along the second direction are determined.

[0013] Based on the first distance compensation value and the second distance compensation value, adjust the positions of the first laser cutting component and the second laser cutting component so that the center point of the first laser galvanometer of the first laser cutting component is located above the electrode cutting line, and the center point of the second laser cutting component is located above the tab region.

[0014] In one embodiment,

[0015] The step of adjusting the position of the first laser cutting assembly according to the electrode strip includes:

[0016] Based on the size parameters and position information of the electrode strip and the position information of the first laser cutting component, determine the coordinates of the midpoint of the electrode cutting line and the coordinates of the center point of the first laser galvanometer.

[0017] The first distance compensation value of the first laser cutting assembly is determined based on the coordinates of the midpoint of the electrode cutting line and the coordinates of the center point of the first laser galvanometer.

[0018] Based on the first distance compensation value, the position of the first laser cutting component is adjusted so that the center point of the first laser galvanometer overlaps with the midpoint of the electrode cutting line in a third direction, which is perpendicular to the first direction and the second direction.

[0019] In one embodiment, the electrode material is symmetrical about the electrode centerline, the electrode centerline is parallel to the first direction, and the electrode centerline intersects the electrode cutting line at the midpoint of the electrode cutting line.

[0020] In one embodiment, after the position of the first laser cutting component is adjusted, the line connecting the center point of the first laser galvanometer and the electrode cutting line is perpendicular to the first direction.

[0021] In one embodiment, the step of adjusting the position of the second laser cutting assembly according to the electrode strip includes:

[0022] Based on the size parameters and position information of the electrode strip and the position information of the second laser cutting assembly, the distance between the center point of the second laser galvanometer and the electrode tab cutting line along the second direction is determined.

[0023] Determine the first angle between the line connecting the center point of the second laser galvanometer and the tab cutting line and the surface of the electrode material near the first laser galvanometer;

[0024] If the first included angle is less than or equal to 90 degrees or greater than 150 degrees, the second distance compensation value of the second laser cutting assembly is determined based on the distance between the center point of the second laser galvanometer and the electrode cutting line along the second direction and the height of the second laser galvanometer.

[0025] Based on the second distance compensation value, adjust the position of the second laser cutting component so that the first included angle is greater than 90 degrees and less than or equal to 150 degrees.

[0026] In one embodiment, in the steps of reciprocatingly cutting the electrode material along the electrode cutting line using the first laser cutting component to form an electrode, and reciprocatingly cutting the electrode foil material along the electrode cutting line using the second laser cutting component to form an electrode tab, at least one laser cutting component unit is used to cut the electrode strip. Each laser cutting component unit includes one first laser cutting component and two second laser cutting components, with the first laser cutting component disposed between the two second laser cutting components.

[0027] Among them, the two second laser cutting components within the same laser cutting component unit are respectively used to cut the electrode foil on both sides of the adjacent electrode tab.

[0028] In one embodiment, multiple laser cutting component units are used to cut the electrode strip, and the electrode die-cutting method further includes the following steps:

[0029] The center points of the multiple second laser galvanometers are aligned to the same straight line.

[0030] In one embodiment, the electrode material is partially attached to the outer peripheral surface of the conveyor of the electrode die-cutting device, and the tab foil passes through the gap between the tab smoothing member of the electrode die-cutting device and the conveyor. The step of adjusting the position of the first laser cutting assembly according to the electrode material includes:

[0031] Based on the position information of the conveyor and the position information of the first laser cutting component, determine whether the orthogonal projection of the line connecting the center point of the first laser galvanometer and the center point of the conveyor along the third direction is parallel to the first direction.

[0032] If not, then based on the position information of the conveyor and the position information of the first laser cutting component, determine the first distance compensation value of the first laser cutting component along the second direction;

[0033] Based on the first distance compensation value, the position of the first laser cutting component is adjusted so that the line connecting the center point of the first laser galvanometer and the center point of the conveyor is parallel to the first direction when projected onto the third direction.

[0034] In one embodiment, the step of adjusting the position of the second laser cutting assembly according to the electrode strip includes:

[0035] Based on the position information of the tab smoothing component and the position information of the second laser cutting component, determine whether the projection of the line connecting the center point of the second laser galvanometer and the center point of the tab smoothing component in the third direction is parallel to the first direction; or, determine whether the center point of the second laser galvanometer is located within a preset distance range on the side of the center point of the tab smoothing component away from the electrode area.

[0036] If neither is true, then based on the position information of the tab smoothing component and the position information of the second laser cutting component, determine the second distance compensation value of the second laser cutting component along the second direction;

[0037] Based on the second distance compensation value, adjust the position of the second laser cutting component so that the projection of the line connecting the center point of the second laser galvanometer and the center point of the tab smoothing component in the third direction is parallel to the first direction, or make the center point of the second laser galvanometer located within a preset distance range on the side of the tab smoothing component away from the electrode area.

[0038] The beneficial effects of this invention are:

[0039] In this invention, the electrode die-cutting method includes conveying an electrode strip along a first direction to the cutting area of ​​an electrode die-cutting device, wherein the electrode material of the electrode strip is aligned with the electrode area of ​​the cutting area, and the tab foil of the electrode strip is aligned with the tab area of ​​the cutting area; adjusting the positions of the first laser cutting assembly and the second laser cutting assembly of the electrode die-cutting device according to the electrode strip, such that the center point of the first laser galvanometer of the first laser cutting assembly is located above a preset electrode cutting line, and the center point of the second laser galvanometer of the second laser cutting assembly is located above the side of the tab cutting line away from the electrode area; reciprocatingly cutting the electrode material along the electrode cutting line using the first laser cutting assembly to form an electrode, and reciprocatingly cutting the tab foil along the tab cutting line using the second laser cutting assembly to form a tab. By placing the first laser galvanometer of the first laser cutting assembly above the electrode cutting line and placing the second laser galvanometer of the second laser cutting assembly above the electrode tab area on one side above the electrode tab region, the laser incident cutting angle of the first laser cutting assembly and the second laser cutting assembly can be increased. This can avoid repeated cutting of the same position, which can cause severe vaporization of the upper surface material of the electrode tab foil. This can solve the problem of foil leakage caused by laser cutting and reduce the risk of short circuit after the electrode is assembled into a core package. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A flowchart of an electrode die-cutting method provided for an embodiment of the present invention;

[0042] Figure 2 A detailed flowchart of the electrode die-cutting method provided in the embodiments of the present invention;

[0043] Figure 3 This is a schematic diagram of the electrode die-cutting device;

[0044] Figure 4 This is a top view of the electrode die-cutting device;

[0045] Figure 5 This is a side view of the electrode die-cutting device;

[0046] Figure 6 A top view of another electrode die-cutting device;

[0047] Figure 7 A front view of another electrode die-cutting device;

[0048] Figure 8 This is a schematic diagram of the structure of the first laser cutting component and the first driving component.

[0049] The names of the components corresponding to the corresponding reference numerals in the figure are as follows: 1-Electrode strip, 11-Electrode material, 12-Electrode tab foil, 2-Electrode die-cutting device, 21-First laser cutting assembly, 211-First laser galvanometer, 22-Second laser cutting assembly, 221-Second laser galvanometer, L1-Electrode cutting line, L2-Electrode tab cutting line, L3-Electrode center line, 3-Roller, 4-Electrode tab smoothing component, 5-Control assembly, 6-First drive assembly, 61-Servo driver, 62-Servo motor, 63-Lead screw, 64-Fixing component. Detailed Implementation

[0050] 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, and 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. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0051] An embodiment of the present invention provides an electrode die-cutting method for cutting electrode strips.

[0052] Please see Figure 1 and Figure 3 , Figure 1 A flowchart of an electrode die-cutting method provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the electrode die-cutting device. The electrode strip 1 includes electrode material 11 and electrode tab foil 12. The electrode material 11 includes a metal foil layer and two substrate layers. The metal foil layer is sandwiched between the two substrate layers. The electrode tab foil 12 has only one metal foil layer. The metal foil layer of the electrode tab foil 12 and the metal foil layer of the electrode material 11 can be different parts of the same metal foil layer. The only difference is that the upper and lower surfaces of the metal foil layer of the electrode tab foil 12 are not covered by substrate.

[0053] The electrode die-cutting device 2 has an electrode area and an electrode tab area, and includes a first laser cutting component 21 and a second laser cutting component 22.

[0054] Electrode die-cutting methods include:

[0055] Step S1: The electrode strip 1 is conveyed along the first direction X to the cutting area of ​​the electrode die-cutting device 2. The electrode material 11 of the electrode strip 1 is opposite to the electrode area of ​​the cutting area, and the tab foil 12 of the electrode strip 1 is opposite to the tab area of ​​the cutting area.

[0056] Step S2: Based on the electrode strip 1, adjust the positions of the first laser cutting component 21 and the second laser cutting component 22 of the electrode die-cutting device 2 so that the center point of the first laser galvanometer 211 of the first laser cutting component 21 is located above the preset electrode cutting line L1, and the center point of the second laser galvanometer 221 of the second laser cutting component 22 is located above the tab area.

[0057] Step S3: The first laser cutting component 21 is used to reciprocate to cut the electrode material 11 along the electrode cutting line L1 to form an electrode, and the second laser cutting component 22 is used to reciprocate to cut the electrode foil material 12 along the electrode cutting line L2 to form an electrode.

[0058] It should be noted that when the conveying device conveys the electrode material 1 to the electrode die-cutting device, the electrode area is used to carry the electrode material 11, and the tab area is used to carry the tab foil 12. Since the electrode area is opposite to the electrode material 11, and the tab area is opposite to the tab foil 12, therefore... Figure 1 The electrode area and the tab area are not illustrated. The area where the electrode material 11 is located can be regarded as the electrode area, and the area where the tab foil material 12 is located can be regarded as the tab area.

[0059] In this embodiment, the electrode cutting line L1 is parallel to the second direction Y, the tab cutting line L2 is parallel to the first direction X, and the first direction X intersects the second direction Y.

[0060] In this embodiment, the first direction X is perpendicular to the second direction Y. In other embodiments, the first direction X and the second direction Y may intersect but not be perpendicular. For example, the first direction X and the second direction Y may form an angle of, but not limited to, 30 degrees, 45 degrees, or 60 degrees.

[0061] The electrode cutting line L1 can be considered as the laser path of the first laser cutting component 21 cutting the electrode material 11. The electrode cutting line L1 is located within the electrode area, and the first laser cutting component 21 can cut the electrode material 11 along the electrode cutting line L1 to form an electrode. The tab cutting line L2 can be considered as the laser path of the second laser cutting component 22 cutting the tab foil 12. The tab cutting line L2 is located at the boundary between the electrode area and the tab area, and the second laser cutting component 22 can cut the excess tab foil 12 along the tab cutting line L2 to form a tab.

[0062] like Figure 4 As shown, Figure 4 This is a top view of the electrode die-cutting apparatus. After the position of the first laser cutting component 21 is adjusted, the center point of the first laser galvanometer 211 is located above the electrode cutting line L1. That is, the orthographic projection of the center point of the first laser galvanometer 211 in the third direction Z falls on the electrode cutting line L1. The third direction Z is perpendicular to the first direction X and the second direction Y, and the line connecting the center point of the first laser galvanometer 211 and the electrode cutting line L1 is perpendicular to the first direction L1. By placing the center point of the first laser galvanometer 211 directly above the electrode cutting line L1, the laser incident cutting angle when the first laser galvanometer 211 cuts the electrode material 11 is 90 degrees, thereby ensuring that the upper substrate of the two electrodes located on both sides of the electrode cutting line L1 has the same degree of vaporization in the cutting area.

[0063] It should be noted that, in this embodiment, the center point of the first laser galvanometer 211 refers to the geometric center of the first laser galvanometer 211, that is, the light output center of the first laser galvanometer 211. The center point of the second laser galvanometer 221 is also the same, and will not be described again here.

[0064] In one embodiment, the positions of the first laser cutting component and the second laser cutting component can be manually adjusted so that the center point of the first laser galvanometer 211 is above the electrode cutting line L1, and the center point of the second laser galvanometer 221 is above the tab region.

[0065] In one embodiment, the electrode die-cutting device used in the electrode die-cutting method provided by the embodiments of the present invention can automatically adjust the positions of the first laser cutting component and the second laser cutting component. Please refer to... Figure 2 , Figure 2 A detailed flowchart of the electrode die-cutting method provided in the embodiments of the present invention includes the following steps: adjusting the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device according to the electrode strip:

[0066] Step S21: Obtain the size parameters and position information of the electrode strip 1, the position information of the first laser cutting component 21, and the position information of the second laser cutting component 22;

[0067] Step S22: Based on the size parameters and position information of the electrode strip 1, the position information of the first laser cutting component 21 and the position information of the second laser cutting component 22, determine the first distance compensation value of the first laser cutting component 21 along the second direction Y and the second distance compensation value of the second laser cutting component 22 along the second direction Y.

[0068] Step S23: Adjust the positions of the first laser cutting component 21 and the second laser cutting component 22 according to the first distance compensation value and the second distance compensation value, so that the center point of the first laser galvanometer 211 is located above the electrode cutting line L1, and the center point of the second laser galvanometer 221 is located above the tab area.

[0069] Specifically, the dimensional parameters of the electrode strip 1 include the width of the electrode material 11 along the second direction. The width of the electrode material 11 along the second direction Y is the length of the electrode cutting line L1. Based on the width of the electrode material 11 along the second direction Y and the position information of the electrode strip, the coordinates of the electrode cutting line L1, the coordinates of the midpoint of the electrode cutting line L1, and the coordinates of the tab cutting line L2 can be determined. The position information of the first laser cutting assembly 21 is the coordinates of the center point of the first laser galvanometer 211, and the position information of the second laser cutting assembly 22 is the coordinates of the center point of the second laser galvanometer 221.

[0070] Based on the coordinates of the electrode cutting line L1 and the coordinates of the center point of the first laser galvanometer 211, it can be determined whether the center point of the first laser galvanometer 211 is located directly above the electrode cutting line L1. If the center point of the first laser galvanometer 211 is not directly above the electrode cutting line L1, the first distance compensation value of the first laser cutting assembly 21 along the second direction Y can be calculated based on the coordinates of the electrode cutting line L1 and the coordinates of the center point of the first laser galvanometer 211. Based on the coordinates of the tab cutting line L2 and the coordinates of the center point of the second laser galvanometer 221, it can be determined whether the center point of the second laser galvanometer 221 is located above the tab region. If the center point of the second laser galvanometer 221 is not above the tab region, the second distance compensation value of the second laser cutting assembly 22 along the second direction Y can be calculated based on the coordinates of the tab cutting line L2 and the coordinates of the center point of the second laser galvanometer 221.

[0071] In this embodiment, the first laser cutting component 21 and the second laser cutting component 22 simultaneously cut the electrode strip, thereby improving the cutting efficiency of the electrode tab die-cutting device. In other embodiments, the first laser cutting component 21 and the second laser cutting component 22 may also cut the electrode strip sequentially, which is not a limitation here. In a preferred embodiment, the step of adjusting the position of the first laser cutting component 21 according to the electrode strip 1 specifically includes: determining the coordinates of the midpoint of the electrode cutting line L1 and the coordinates of the center point of the first laser galvanometer 211 according to the size parameters and position information of the electrode strip 1 and the position information of the first laser cutting component 21; determining the first distance compensation value of the first laser cutting component 211 according to the coordinates of the midpoint of the electrode cutting line L1 and the coordinates of the center point of the first laser galvanometer 211; and adjusting the position of the first laser cutting component 21 according to the first distance compensation value so that the center point of the first laser galvanometer 211 overlaps with the midpoint of the electrode cutting line L1 in the third direction Z, where the third direction Z is perpendicular to the first direction X and the second direction Y.

[0072] It should be noted that the center point of the first laser galvanometer 211 overlaps with the midpoint of the electrode cutting line L1 in the third direction Z, that is, the center point of the first laser galvanometer 211 is located directly above the midpoint of the electrode cutting line L1. The electrode material 11 is symmetrical about the electrode centerline L3, which passes through the midpoint of the electrode cutting line L1. Since the effective cutting range of the first laser galvanometer 211 is symmetrical about its center point, by placing the center point of the first laser galvanometer 211 directly above the midpoint of the electrode cutting line L1, it can be ensured that the upper substrate of the electrode on both sides of the electrode centerline L3 has a consistent degree of vaporization in the cutting area.

[0073] like Figure 4 As shown, the center point of the second laser galvanometer 221 is located above the tab region, and the orthogonal projection of the center point of the second laser galvanometer 221 along the third direction Z is located within the tab region.

[0074] Combination Figure 4 and Figure 5 As shown, Figure 5 This is a side view of the electrode die-cutting device. After the position of the second laser component 22 is adjusted, the first included angle α between the line connecting the center point of the second laser galvanometer 221 and the electrode tab cutting line L2 and the surface of the electrode material 11 near the first laser galvanometer 211 is greater than 90 degrees. The first included angle α is the laser incident cutting angle of the second laser cutting component 22. This is equivalent to increasing the laser incident cutting angle of the second laser cutting component 22, reducing the vaporization of the upper substrate of the electrode material 11 caused by repeated cutting, thereby solving the problem of foil leakage and reducing the risk of short circuit after the electrode is assembled into a core package.

[0075] In a preferred embodiment, the step of adjusting the position of the second laser cutting assembly 22 according to the electrode strip 1 includes: determining the distance between the center point of the second laser galvanometer 221 and the tab cutting line L2 along the second direction according to the size parameters and position information of the electrode strip 1 and the position information of the second laser cutting assembly 22; determining the first included angle between the line connecting the center point of the second laser galvanometer 221 and the tab cutting line L2 along the second direction and the surface of the electrode material 11 near the first laser galvanometer 211 according to the distance between the center point of the second laser galvanometer 221 and the tab cutting line L2 along the second direction and the height of the second laser galvanometer 221; if the first included angle is less than or equal to 90 degrees or greater than 150 degrees, then determining the second distance compensation value of the second laser cutting assembly 22 according to the distance between the center point of the second laser galvanometer 221 and the tab cutting line L2 along the second direction and the height of the second laser galvanometer 221; and adjusting the position of the second laser cutting assembly 22 according to the second distance compensation value so that the first included angle is greater than 90 degrees and less than or equal to 150 degrees.

[0076] In this preferred embodiment, after the position of the second laser component 22 is adjusted, the first included angle α between the line connecting the center point of the second laser galvanometer 221 and the tab cutting line L2 and the surface of the electrode material 11 near the first laser galvanometer 211 can be, but is not limited to, 91 degrees, 95 degrees, 100 degrees, 120 degrees, 135 degrees, or 150 degrees. Preferably, the first included angle α should be greater than 90 degrees and less than or equal to 150 degrees. This ensures that while increasing the laser incident cutting angle of the second laser cutting component 22, the situation of foil leakage on the back side of the electrode is avoided due to an excessively large laser incident cutting angle of the second laser cutting component 22.

[0077] Furthermore, in the steps of reciprocatingly cutting the electrode material along the electrode cutting line using the first laser cutting component to form the electrode sheet, and reciprocatingly cutting the electrode foil along the electrode tab cutting line using the second laser cutting component to form the electrode tab, at least one laser cutting component unit is used to cut the electrode strip. Each laser cutting component unit includes one first laser cutting component 21 and two second laser cutting components 22. The first laser cutting component 21 is disposed between the two second laser cutting components 22. The two second laser cutting components 22 in the same laser cutting component unit are respectively used to cut the electrode foil on the adjacent sides of the electrode tab.

[0078] In this embodiment, as Figure 4 As shown, the electrode die-cutting device includes a laser cutting assembly unit, which includes a first laser cutting assembly 21 and two second laser cutting assemblies 22. The first laser cutting assembly 21 is disposed between the two second laser cutting assemblies 22, and the line connecting the center points of the second laser galvanometers 221 of the two second laser cutting assemblies 22 is parallel to the first direction X.

[0079] The first laser cutting component 21 is used to cut the electrode material 11 along the electrode cutting line L1. One of the two second laser cutting components 22 cuts the electrode foil 12 on the left side of the electrode along the corresponding electrode cutting line, and the other of the two second laser cutting components 22 cuts the electrode foil 12 on the right side of the electrode along the corresponding electrode cutting line. By increasing the number of second laser cutting components 22, the electrode foil on both sides of the electrode can be cut simultaneously, which can improve the cutting efficiency of the electrode die-cutting device.

[0080] In a preferred embodiment, multiple laser cutting component units are used to cut the electrode strip. The number of laser cutting component units can be two, three or more, and the multiple laser cutting component units can be arranged side by side at intervals along the first direction X.

[0081] Furthermore, the electrode die-cutting method also includes: adjusting the center points of multiple second laser galvanometers 221 to be on the same straight line.

[0082] Preferably, after the positions of the multiple second laser galvanometers 221 are adjusted, the line connecting the center points of the second laser galvanometers 221 of the multiple second laser cutting components 22 is parallel to the first direction X and the tab cutting line L2, so as to ensure that the cutting effect of multiple different second laser cutting components 22 is consistent.

[0083] Furthermore, the first laser cutting assembly 21 includes a first laser that corresponds to and cooperates with the first laser galvanometer 211, and the second laser cutting assembly 22 includes a second laser that corresponds to and cooperates with the second laser galvanometer 221. Both the first laser and the second laser are picosecond lasers.

[0084] Furthermore, the power of the first laser is greater than or equal to 5 megawatts and less than or equal to 10 megawatts, and the power of the second laser is greater than or equal to 5 megawatts and less than or equal to 10 megawatts.

[0085] Specifically, the power of both the first and second lasers can be, but is not limited to, 5 MW, 6 MW, 8 MW, or 10 MW, etc., as long as it is between 5 MW and 10 MW, it can ensure that the first and second laser cutting components can cut the electrode strip. In practical applications, the power of the first and second lasers can be equal or unequal, and there is no restriction here.

[0086] Please see Figure 6 and Figure 7 , Figure 6 This is a top view of another electrode die-cutting device. Figure 7 A front view of another electrode die-cutting apparatus provided in an embodiment of the present invention, the structure of which is similar to... Figure 3The electrode die-cutting devices described above have roughly the same structure, the difference being that the electrode die-cutting device also includes multiple conveying members 3 and multiple tab smoothing members 4. The tab smoothing members 4 are disposed on the outer peripheral surface near one end of the conveying member 3, and the tab smoothing members 4 can be located above or below the conveying member 3. The electrode material 11 is partially attached to the outer peripheral surface of the conveying member 3, and the tab foil 12 passes through the gap between the tab smoothing member 4 and the conveying member 3. The tab smoothing member 4 can smooth out the curled tab foil 12.

[0087] It should be noted that, Figure 6 The diagram only illustrates the relative positions of the conveyor 3, the tab smoothing component 4, the first laser cutting assembly 21, the second laser cutting assembly 22, and the electrode strip. It does not represent the actual number of rollers 3 and tab smoothing components 4 used in actual applications.

[0088] In this embodiment, the conveyor 3 is a roller, which is cylindrical, and the electrode material 11 is partially attached to the outer circumferential surface of the roller. Driven by the roller (not shown in the figure), the electrode strip 1 can move along the first direction X, and the roller can rotate as the electrode strip 1 moves. The projection of the line connecting the center point of the first laser galvanometer 211 and the midpoint of the center line of the roller along the third direction X is parallel to the first direction X.

[0089] In one embodiment, the position of the first laser cutting assembly 21 can be adjusted according to the position of the conveyor 3. The step of adjusting the position of the first laser cutting assembly based on the electrode strip includes: determining, based on the position information of the conveyor 3 and the position information of the first laser cutting assembly 21, whether the orthographic projection of the line connecting the center point of the first laser galvanometer 211 and the center point of the conveyor 3 along the third direction Z is parallel to the first direction X; if not, determining a first distance compensation value for the first laser cutting assembly 21 along the second direction Y based on the position information of the conveyor 3 and the position information of the first laser cutting assembly 21; and adjusting the position of the first laser cutting assembly 21 according to the first distance compensation value so that the orthographic projection of the line connecting the center point of the first laser galvanometer 211 and the center point of the conveyor 3 along the third direction Z is parallel to the first direction X. In this way, the first laser cutting assembly 21 can also be adjusted to a position that meets the cutting conditions.

[0090] In one embodiment, the position of the second laser cutting assembly 22 can be adjusted according to the position of the tab smoothing member 4. The step of adjusting the position of the second laser cutting assembly 22 based on the electrode strip includes: determining, based on the position information of the tab smoothing member 4 and the position information of the second laser cutting assembly 22, whether the projection of the line connecting the center point of the second laser galvanometer 221 and the center point of the tab smoothing member 4 in the third direction Z is parallel to the first direction X; or, whether the center point of the second laser galvanometer 221 is located within a preset distance range on the side of the tab smoothing member 4 away from the electrode area; if the position of the center point of the second laser galvanometer 221 satisfies either of the above two conditions, then the surface... If the position of the center point of the second laser galvanometer meets the cutting conditions, no adjustment to the position of the second laser cutting assembly 22 is necessary. If neither of these conditions is met, then based on the position information of the electrode smoothing component 4 and the second laser cutting assembly 22, a second distance compensation value for the second laser cutting assembly 22 along the second direction Y is determined. Based on the second distance compensation value, the position of the second laser cutting assembly 22 is adjusted so that the projection of the line connecting the center point of the second laser galvanometer 221 and the center point of the electrode smoothing component 4 onto the third direction Z is parallel to the first direction X, or the center point of the second laser galvanometer 221 is located within a preset distance range on the side of the electrode smoothing component 4 away from the electrode area. As long as either of these two conditions is met, the second laser cutting assembly 22 can be adjusted to a position that meets the cutting conditions.

[0091] It should be noted that when the projection of the line connecting the center point of the second laser galvanometer 221 and the center point of the tab smoothing member 4 onto the third direction Z is parallel to the first direction X, that is, the center point of the second laser galvanometer 221 is aligned with the center points of the multiple tab smoothing members 4 on the first direction X.

[0092] Furthermore, the preset distance range is greater than or equal to 0 and less than or equal to 10 millimeters.

[0093] For example, the distance d between the center point of the second laser galvanometer 221 and the center point of the tab smoothing member 4 along the second direction Y can be any value among, but not limited to, 0, 2, 4, 6, 8 or 10 mm, as long as it is between 0 and 10 mm, thus ensuring that the laser incident cutting angle of the second laser galvanometer 221 is greater than 90 degrees.

[0094] In this embodiment, the electrode die-cutting device further includes a camera assembly, a control assembly 5, a first drive assembly 6, and a second drive assembly. The camera assembly is used to acquire the size parameters and position information of the electrode strip, the position information of the first laser cutting assembly, and the position information of the second laser cutting assembly.

[0095] Specifically, the imaging component is a CCD camera. When the electrode strip is conveyed to the cutting area, both the conveying mechanism and the electrode strip stop moving. The CCD camera takes pictures of the electrode strip, the first laser cutting component, and the second laser cutting component. Based on the pictures, the size parameters of the electrode strip, the position information of the first laser cutting component, and the position information of the second laser cutting component can be obtained.

[0096] In this embodiment, the dimensional parameter of the electrode strip 1 is the width of the electrode material 11 along the second direction Y. The width of the electrode material 11 along the second direction Y is the length of the electrode cutting line L1. Based on the width of the electrode material 11 along the second direction Y and the position information of the electrode material 11, the coordinates of the electrode cutting line L1 and the coordinates of the midpoint of the electrode cutting line L1 can be determined. The position information of the first laser cutting component refers to the coordinates of the center point of the first laser galvanometer, and the position information of the second laser cutting component refers to the coordinates of the center point of the second laser galvanometer.

[0097] In this embodiment, the control component is communicatively connected to the camera component. The control component is used to determine a first distance compensation value for the first laser cutting component along the second direction and a second distance compensation value for the second laser cutting component along the second direction based on the size parameters and position information of the electrode strip, the position information of the first laser cutting component, and the position information of the second laser cutting component. Specifically, the control component can be a computer.

[0098] The first driving component 6 is communicatively connected to the control component 5 and to the first laser cutting component 21. The first driving component 6 is used to drive the first laser cutting component 21 to move along the second direction Y to directly above the electrode cutting line L1 according to a first distance compensation value. The second driving component (not shown in the figure) is communicatively connected to the control component and to the second laser cutting component 22. The second driving component is used to drive the second laser cutting component 22 to move along the second direction Y to above the tab region according to a second distance compensation value.

[0099] In one embodiment, such as Figure 8 As shown, Figure 8 This is a schematic diagram of the structure of the first laser cutting assembly and the first driving assembly. Taking the first driving assembly 6 as an example, the first driving assembly 6 includes a servo driver 61, a servo motor 62, and a lead screw 63. The servo driver 61 is communicatively connected to the control assembly 5 and the servo motor 62, respectively. The lead screw 63 is drively connected to the servo motor 62. The lead screw 63 passes through a fixing member 64 and is threadedly connected to the fixing member 64. The fixing member 64 can be a lead screw fixing rod. The lead screw 63 is rotatably connected to the first laser cutting assembly 21.

[0100] The control component 5 sends the first distance compensation value to the servo driver 61. The servo driver 61 controls the servo motor 62 to operate and drives the lead screw 63 to rotate. Under the drive of the lead screw 63, the first laser cutting component 21 moves along the second direction Y to directly above the electrode cutting line L1. The structure and working principle of the second drive component are the same as those of the first drive component, and will not be described in detail here.

[0101] The beneficial effects of the present invention are as follows: In the present invention, the electrode die-cutting method includes conveying an electrode strip along a first direction to the cutting area of ​​the electrode die-cutting device, wherein the electrode material of the electrode strip is aligned with the electrode area of ​​the cutting area, and the tab foil of the electrode strip is aligned with the tab area of ​​the cutting area; according to the electrode strip, adjusting the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device, such that the center point of the first laser galvanometer of the first laser cutting component is located above a preset electrode cutting line, and the center point of the second laser galvanometer of the second laser cutting component is located above the side of the tab cutting line away from the electrode area; using the first laser cutting component to reciprocately cut the electrode material along the electrode cutting line to form an electrode, and using the second laser cutting component to reciprocately cut the tab foil along the tab cutting line to form a tab. By placing the first laser galvanometer of the first laser cutter above the electrode cutting line and the second laser galvanometer of the second laser cutter assembly above the tab area, the laser incident cutting angle of the first laser cutter assembly and the second laser cutter assembly is increased. This avoids repeated cutting of the same position, which can cause severe vaporization of the upper surface material of the tab foil. This can solve the problem of foil leakage caused by laser cutting and reduce the risk of short circuit after the electrode is assembled into a core package.

[0102] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for die-cutting electrodes, characterized in that, include: The electrode strip is conveyed along the first direction to the cutting area of ​​the electrode die-cutting device, wherein the electrode material of the electrode strip is opposite to the electrode area of ​​the cutting area, and the tab foil of the electrode strip is opposite to the tab area of ​​the cutting area. According to the electrode strip, adjust the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device so that the center point of the first laser galvanometer of the first laser cutting component is located directly above the preset electrode cutting line, and the center point of the second laser galvanometer of the second laser cutting component is located above the electrode tab area. The first laser cutting component is used to reciprocately cut the electrode material along the electrode cutting line to form an electrode, and the second laser cutting component is used to reciprocately cut the electrode foil material along the electrode tab cutting line to form an electrode tab; Wherein, the electrode cutting line is parallel to the second direction, the electrode tab cutting line is parallel to the first direction, and the first direction intersects the second direction; The first angle between the line connecting the center point of the second laser galvanometer and the electrode cutting line and the surface of the electrode material near the first laser galvanometer is greater than 90 degrees and less than or equal to 150 degrees.

2. The electrode die-cutting method as described in claim 1, characterized in that, The step of adjusting the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device according to the electrode strip includes: Obtain the size parameters and position information of the electrode strip, the position information of the first laser cutting component, and the position information of the second laser cutting component; Based on the size parameters and position information of the electrode strip, the position information of the first laser cutting component, and the position information of the second laser cutting component, a first distance compensation value of the first laser cutting component along the second direction and a second distance compensation value of the second laser cutting component along the second direction are determined. Based on the first distance compensation value and the second distance compensation value, adjust the positions of the first laser cutting component and the second laser cutting component so that the center point of the first laser galvanometer is located above the electrode cutting line and the center point of the second laser galvanometer is located above the tab region.

3. The electrode die-cutting method as described in claim 2, characterized in that, The step of adjusting the position of the first laser cutting assembly according to the electrode strip includes: Based on the size parameters and position information of the electrode strip and the position information of the first laser cutting component, determine the coordinates of the midpoint of the electrode cutting line and the coordinates of the center point of the first laser galvanometer. The first distance compensation value of the first laser cutting assembly is determined based on the coordinates of the midpoint of the electrode cutting line and the coordinates of the center point of the first laser galvanometer. Based on the first distance compensation value, the position of the first laser cutting component is adjusted so that the center point of the first laser galvanometer overlaps with the midpoint of the electrode cutting line in a third direction, which is perpendicular to the first direction and the second direction.

4. The electrode die-cutting method as described in claim 3, characterized in that, The electrode material is symmetrical about the electrode centerline, the electrode centerline is parallel to the first direction, and the electrode centerline intersects the electrode cutting line at the midpoint of the electrode cutting line.

5. The electrode die-cutting method as described in claim 3, characterized in that, After the position of the first laser cutting component is adjusted, the line connecting the center point of the first laser galvanometer and the electrode cutting line is perpendicular to the first direction.

6. The electrode die-cutting method as described in claim 2, characterized in that, The step of adjusting the position of the second laser cutting assembly according to the electrode strip includes: Based on the size parameters and position information of the electrode strip and the position information of the second laser cutting assembly, the distance between the center point of the second laser galvanometer and the electrode tab cutting line along the second direction is determined. Determine the first angle between the line connecting the center point of the second laser galvanometer and the tab cutting line and the surface of the electrode material near the first laser galvanometer; If the first included angle is less than or equal to 90 degrees or greater than 150 degrees, the second distance compensation value of the second laser cutting assembly is determined based on the distance between the center point of the second laser galvanometer and the electrode cutting line along the second direction and the height of the second laser galvanometer. Based on the second distance compensation value, adjust the position of the second laser cutting component so that the first included angle is greater than 90 degrees and less than or equal to 150 degrees.

7. The electrode die-cutting method according to any one of claims 1 to 6, characterized in that, In the steps of reciprocatingly cutting the electrode material along the electrode cutting line using the first laser cutting component to form an electrode, and reciprocatingly cutting the electrode foil material along the electrode cutting line using the second laser cutting component to form an electrode, at least one laser cutting component unit is used to cut the electrode strip. Each laser cutting component unit includes one first laser cutting component and two second laser cutting components, with the first laser cutting component disposed between the two second laser cutting components. Among them, the two second laser cutting components within the same laser cutting component unit are respectively used to cut the electrode foil on both sides of the adjacent electrode tab.

8. The electrode die-cutting method as described in claim 7, characterized in that, The electrode strip is cut using multiple laser cutting component units, and the electrode die-cutting method further includes the following steps: The center points of the multiple second laser galvanometers are aligned to the same straight line.

9. The electrode die-cutting method according to any one of claims 1 to 6, characterized in that, The electrode sheet material is partially attached to the outer peripheral surface of the conveyor of the electrode die-cutting device, and the electrode tab foil passes through the gap between the electrode tab smoothing component and the conveyor of the electrode die-cutting device. The step of adjusting the position of the first laser cutting assembly according to the electrode sheet material includes: Based on the position information of the conveyor and the position information of the first laser cutting component, determine whether the orthogonal projection of the line connecting the center point of the first laser galvanometer and the center point of the conveyor along the third direction is parallel to the first direction. If not, then based on the position information of the conveyor and the position information of the first laser cutting component, determine the first distance compensation value of the first laser cutting component along the second direction; Based on the first distance compensation value, the position of the first laser cutting component is adjusted so that the line connecting the center point of the first laser galvanometer and the center point of the conveyor is parallel to the first direction when projected onto the third direction.

10. The electrode die-cutting method as described in claim 9, characterized in that, The step of adjusting the position of the second laser cutting assembly according to the electrode strip includes: Based on the position information of the tab smoothing component and the position information of the second laser cutting component, determine whether the projection of the line connecting the center point of the second laser galvanometer and the center point of the tab smoothing component in the third direction is parallel to the first direction; or, determine whether the center point of the second laser galvanometer is located within a preset distance range on the side of the center point of the tab smoothing component away from the electrode area. If neither is true, then based on the position information of the tab smoothing component and the position information of the second laser cutting component, determine the second distance compensation value of the second laser cutting component along the second direction; Based on the second distance compensation value, adjust the position of the second laser cutting component so that the projection of the line connecting the center point of the second laser galvanometer and the center point of the tab smoothing component in the third direction is parallel to the first direction, or make the center point of the second laser galvanometer located within a preset distance range on the side of the tab smoothing component away from the electrode area.

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