Electrode sheet die-cutting method and electrode sheet die-cutting device

Abstract

The present application provides an electrode sheet die-cutting method and an electrode sheet die-cutting device. The electrode sheet die-cutting method comprises: conveying an electrode sheet material strip to a cutting area of the electrode sheet die-cutting device in a first direction; and, according to the electrode sheet material strip, adjusting the positions of a first laser cutting assembly and a second laser cutting assembly of the electrode sheet die-cutting device, such that the center point of a first laser galvanometer of the first laser cutting assembly is located above a preset electrode sheet cutting line, and the center point of a second laser galvanometer of the second laser cutting assembly is located above a tab cutting area.

Description

Pole piece die-cutting method and pole piece die-cutting device

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on June 9, 2023, with application numbers 202310689111.7 and 202321482157.3, respectively. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a pole piece die-cutting method and a pole piece die-cutting device. Background Art

[0003] At present, the lithium battery industry mainly uses multiple groups of lasers to laser cut wide-width pole pieces. The multiple groups of lasers are located above the center line of the pole piece and arranged in a straight line. They are respectively configured to be responsible for the cutting area of ​​the pole piece and the cutting area of ​​the pole ear. SUMMARY OF THE INVENTION

[0004] In the related technology, the angle between the laser path for pole piece die-cutting and the pole piece strip is an acute angle. When the same position of the pole piece strip is repeatedly cut, the upper surface material at the connection between the pole tab foil and the pole piece material of the pole piece strip will be severely vaporized, resulting in serious foil leakage in the cutting area and powder falling, which greatly increases the risk of short circuit after the pole piece is assembled into a core package.

[0005] Therefore, it is necessary to provide a pole piece die-cutting method and a pole piece die-cutting device to improve this defect.

[0006] The embodiments of the present application provide a pole piece die-cutting method and a pole piece die-cutting device, which can solve the problem of foil leakage caused by laser cutting and reduce the risk of short circuit after the pole pieces are assembled into a core package.

[0007] To achieve this goal, this application adopts the following technical solutions:

[0008] In a first aspect, an embodiment of the present application provides a pole piece die-cutting method, comprising:

[0009] The electrode strip is conveyed along a first direction to a cutting area of ​​an electrode die-cutting device, wherein the electrode strip of the electrode strip is directly opposite to the electrode cutting area of ​​the cutting area, and the tab foil of the electrode strip is directly opposite to the tab cutting area of ​​the cutting area;

[0010] According to the pole piece strip, adjust the positions of the first laser cutting assembly and the second laser cutting assembly of the pole piece die-cutting device so that the center point of the first laser galvanometer of the first laser cutting assembly is located above the preset pole piece cutting line, and the center point of the second laser galvanometer of the second laser cutting assembly is located above the pole tab cutting area;

[0011] The first laser cutting assembly is used to reciprocately cut the pole sheet material along the pole sheet cutting line to form a pole sheet, and the second laser cutting assembly is used to reciprocately cut the pole tab foil along the pole tab cutting line to form a pole tab;

[0012] The electrode sheet 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.

[0013] In a second aspect, an embodiment of the present application further provides a pole piece die-cutting device configured to cut a pole piece strip, wherein the pole piece strip has a pole piece material and a pole tab foil, wherein the pole piece material is opposite to the pole piece cutting area of ​​the pole piece die-cutting device, and the pole tab foil is opposite to the pole tab cutting area of ​​the pole piece die-cutting device, and the pole piece die-cutting device comprises:

[0014] a first laser cutting assembly configured to reciprocately cut the electrode sheet material conveyed to the electrode sheet cutting area of ​​the electrode sheet die-cutting device along a preset electrode sheet cutting line to form electrode sheets, wherein the conveying direction of the electrode sheet strip is parallel to the first direction, the electrode sheet cutting line is located in the electrode sheet cutting area and is parallel to the second direction, the first direction intersects the second direction, and the first laser cutting assembly includes a first laser galvanometer, the center point of the first laser galvanometer is located above the electrode sheet cutting line;

[0015] The second laser cutting assembly is configured to perform reciprocating cutting along a preset tab cutting line on the tab foil conveyed to the tab cutting area of ​​the pole piece die-cutting device to form a tab, wherein the tab cutting line is located at the junction of the pole piece cutting area and the tab cutting area and is parallel to the first direction, and the second laser cutting assembly includes a second laser galvanometer, and the center point of the second laser galvanometer is located above the tab cutting area. Beneficial effects

[0016] In the present application, the electrode die-cutting method includes conveying the electrode strip along a first direction to the cutting area of ​​the electrode die-cutting device, the electrode material of the electrode strip is opposite to the electrode cutting area of ​​the cutting area, and the pole tab foil of the electrode strip is opposite to the pole tab cutting area of ​​the cutting area; according to the electrode strip, the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device are adjusted 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 side of the pole tab cutting line away from the pole tab cutting area; the first laser cutting component is used to perform reciprocating cutting of the electrode material along the pole tab cutting line to form a pole piece, and the second laser cutting component is used to perform reciprocating cutting of the pole tab foil along the pole tab cutting line to form a pole tab. By placing the first laser galvanometer of the first laser cutting assembly above the pole piece cutting line, and placing the second laser galvanometer of the second laser cutting assembly above the upper side of the pole tab cutting area, the laser incident cutting angles of the first laser cutting assembly and the second laser cutting assembly are increased. This can avoid repeated cutting of the same position to cause serious vaporization of the surface material of the pole tab foil, thereby solving the problem of foil leakage caused by laser cutting and reducing the risk of short circuit after the pole piece is assembled into a core package.

[0017] In the application, the pole piece die-cutting device includes a first laser cutting component and a second laser cutting component. The first laser cutting component is configured to perform reciprocating cutting along the pole piece cutting line on the pole piece material transported to the pole piece cutting area to form a pole piece, and the second laser cutting component is configured to perform reciprocating cutting along the pole piece cutting line on the pole piece foil transported to the pole tab cutting area to form a pole tab. By placing the first laser galvanometer above the pole piece cutting line and placing the second laser galvanometer of the second laser cutting component above the pole tab cutting area, the laser incident cutting angle of the first laser cutting component and the second laser cutting component is increased, thereby avoiding repeated cutting of the same position to cause serious vaporization of the upper surface material of the pole tab foil, thereby solving the problem of foil leakage caused by laser cutting and reducing the risk of short circuit after the pole piece is assembled into a core package. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a flow chart of a pole piece die-cutting method provided in an embodiment of the present application;

[0019] FIG2 is a specific flow chart of a pole piece die-cutting method provided in an embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of a pole piece die-cutting device;

[0021] FIG4 is a top view of the pole piece die-cutting device;

[0022] Figure 5 is a side view of the pole piece die-cutting device;

[0023] FIG6 is a top view of another pole piece die-cutting device;

[0024] Figure 7 is a front view of another pole piece die-cutting device;

[0025] FIG8 is a schematic structural diagram of the first laser cutting assembly and the first driving assembly.

[0026] The names of the components corresponding to the corresponding figure marks in the figure are: 1-pole sheet strip, 11-pole sheet material, 12-pole tab foil, 2-pole sheet die-cutting device, 21-first laser cutting assembly, 211-first laser galvanometer, 22-second laser cutting assembly, 221-second laser galvanometer, L1-pole sheet cutting line, L2-pole tab cutting line, L3-pole sheet center line, 3-roller, 4-pole tab smoothing member, 5-control assembly, 6-first drive assembly, 61-servo drive, 62-servo motor, 63-screw, 64-fixing part. Modes for Carrying Out the Invention

[0027] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0028] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0030] The technical solution of the present application will be further explained below with reference to the accompanying drawings and through specific implementation methods.

[0031] An embodiment of the present application provides a pole piece die-cutting method, which is used to cut a pole piece strip.

[0032] Please refer to Figures 1 and 3. Figure 1 is a flow chart of the electrode die-cutting method provided in an embodiment of the present application, and Figure 3 is a schematic structural diagram of the electrode die-cutting device. The electrode strip 1 includes an electrode material 11 and a tab foil 12. The electrode material 11 includes a layer of metal foil and two layers of substrate, with the metal foil sandwiched between the two layers of substrate. The tab foil 12 has only one layer of metal foil. The metal foil of the tab foil 12 and the metal foil of the electrode material 11 can be different parts of the same metal foil. The only difference is that the upper and lower surfaces of the metal foil of the tab foil 12 are not covered by the substrate.

[0033] The pole piece die-cutting device 2 has a pole piece cutting area and a pole tab cutting area. The pole piece die-cutting device 2 includes a first laser cutting component 21 and a second laser cutting component 22 .

[0034] Pole die cutting methods include:

[0035] Step S1: transport the electrode strip 1 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 cutting area of ​​the cutting area, and the electrode tab foil 12 of the electrode strip 1 is opposite to the electrode tab cutting area of ​​the cutting area.

[0036] Step S2: According to the pole piece strip 1, adjust the positions of the first laser cutting component 21 and the second laser cutting component 22 of the pole piece 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 pole piece cutting line L1, and the center point of the second laser galvanometer 221 of the second laser cutting component 22 is located above the pole ear cutting area.

[0037] Step S3: using the first laser cutting assembly 21 to reciprocately cut the pole sheet material 11 along the pole sheet cutting line L1 to form pole sheets, and using the second laser cutting assembly 22 to reciprocately cut the pole tab foil 12 along the tab cutting line L2 to form tabs.

[0038] It should be noted that when the conveying device conveys the pole sheet material 11 to the pole sheet die-cutting device, the pole sheet cutting area is configured to carry the pole sheet material 11, and the tab cutting area is configured to carry the tab foil 12. Since the pole sheet cutting area is opposite to the pole sheet material 11, and the tab cutting area is opposite to the tab foil 12, FIG1 does not illustrate the pole sheet cutting area and the tab cutting area. The area where the pole sheet material 11 is located can be regarded as the pole sheet cutting area, and the area where the tab foil 12 is located can be regarded as the tab cutting area.

[0039] In this embodiment, the electrode sheet 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 and the second direction Y intersect.

[0040] 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.

[0041] The pole piece cutting line L1 can be regarded as the laser path of the first laser cutting assembly 21 for cutting the pole piece material 11. The pole piece cutting line L1 is located in the pole piece cutting area. The first laser cutting assembly 21 can cut the pole piece material 11 along the pole piece cutting line L1 to form a pole piece. The tab cutting line L2 can be regarded as the laser path of the second laser cutting assembly 22 for cutting the tab foil 12. The tab cutting line L2 is located at the junction of the pole piece cutting area and the tab cutting area. The second laser cutting assembly 22 can cut the excess tab foil 12 along the tab cutting line L2 to form a tab.

[0042] As shown in Figure 4, Figure 4 is a top view of the pole piece die-cutting device. After the position of the first laser cutting assembly 21 is adjusted, the center point of the first laser galvanometer 211 is located above the pole piece 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 pole piece cutting line L1, the third direction Z is perpendicular to the first direction X and the second direction Y, and the line between the center point of the first laser galvanometer 211 and the pole piece cutting line L1 is perpendicular to the first direction X. By placing the center point of the first laser galvanometer 211 directly above the pole piece cutting line L1, the laser incident cutting angle when the first laser galvanometer 211 cuts the pole piece material 11 can be made 90 degrees, thereby ensuring that the upper substrates of the two pole pieces on both sides of the pole piece cutting line L1 have the same degree of vaporization in the cutting area.

[0043] It should be noted that, in this embodiment, the center point of the first laser galvanometer 211 refers to the geometric center point of the first laser galvanometer 211, that is, the light output center of the first laser galvanometer 211, and the center point of the second laser galvanometer 221 is also the same, which will not be repeated here.

[0044] In one embodiment, the positions of the first laser cutting assembly and the second laser cutting assembly can be manually adjusted so that the center point of the first laser galvanometer 211 is located above the pole piece cutting line L1, and the center point of the second laser galvanometer 221 is located above the pole tab cutting area.

[0045] In one embodiment, the pole piece die-cutting device used in the pole piece die-cutting method provided in the embodiment of the present application can automatically adjust the positions of the first laser cutting component and the second laser cutting component. Please refer to Figure 2, which is a specific flow chart of the pole piece die-cutting method provided in the embodiment of the present application. The steps of adjusting the positions of the first laser cutting component and the second laser cutting component of the pole piece die-cutting device according to the pole piece strip include:

[0046] Step S21: obtaining the size parameters and position information of the pole piece strip 1, the position information of the first laser cutting assembly 21, and the position information of the second laser cutting assembly 22;

[0047] Step S22: determining a first distance compensation value of the first laser cutting assembly 21 along the second direction Y and a second distance compensation value of the second laser cutting assembly 22 along the second direction Y according to the size parameters and position information of the pole piece strip 1, the position information of the first laser cutting assembly 21, and the position information of the second laser cutting assembly 22;

[0048] Step S23: According to the first distance compensation value and the second distance compensation value, adjust the positions of the first laser cutting component 21 and the second laser cutting component 22 so that the center point of the first laser galvanometer 211 is located above the pole piece cutting line L1, and the center point of the second laser galvanometer 221 is located above the pole tab cutting area.

[0049] Specifically, the dimensional parameters of the electrode strip 1 include 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. 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 based on the width of the electrode material 11 along the second direction Y and the position information of the electrode strip. 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.

[0050] According to the coordinates of the pole piece 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 pole piece cutting line L1. If the center of the first laser galvanometer 211 is not directly above the pole piece 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 pole piece cutting line L1 and the coordinates of the center point of the first laser galvanometer 211. According to 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 cutting area. If the center point of the second laser galvanometer 221 is not above the tab cutting area, 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.

[0051] In this embodiment, the first laser cutting assembly 21 and the second laser cutting assembly 22 cut the pole piece strip at the same time, which can improve the cutting efficiency of the tab die-cutting device. In some other embodiments, the first laser cutting assembly 21 and the second laser cutting assembly 22 can also cut the pole piece strip successively, which is not limited here. In a preferred embodiment, according to the pole piece strip 1, the step of adjusting the position of the first laser cutting assembly 21 specifically includes: determining the coordinates of the midpoint of the pole piece 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 pole piece strip 1 and the position information of the first laser cutting assembly 21; determining the first distance compensation value of the first laser cutting assembly 21 according to the coordinates of the midpoint of the pole piece cutting line L1 and the coordinates of the center point of the first laser galvanometer 211; adjusting the position of the first laser cutting assembly 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 pole piece cutting line L1 in the third direction Z, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0052] It should be noted that the center point of the first laser galvanometer 211 overlaps with the midpoint of the pole piece 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 pole piece cutting line L1. The pole piece material 11 is symmetrical about the pole piece center line L3, and the pole piece center line L3 passes through the midpoint of the pole piece cutting line L1. Because the effective cutting range of the first laser galvanometer 211 is symmetrical about the center point of the first laser galvanometer 211, by positioning the center point of the first laser galvanometer 211 directly above the midpoint of the pole piece cutting line L1, it can be ensured that the upper substrate of the pole piece on both sides of the pole piece center line L3 has the same degree of vaporization in the cutting area.

[0053] As shown in FIG4 , the center point of the second laser galvanometer 221 is located above the tab cutting area, and the orthographic projection of the center point of the second laser galvanometer 221 along the third direction Z is located within the tab cutting area.

[0054] Combined with Figures 4 and 5, Figure 5 is a side view of the pole piece die-cutting device. After the position of the second laser cutting component 22 is adjusted, the first angle α between the line between the center point of the second laser galvanometer 221 and the pole ear cutting line L2 and the surface of the pole piece material 11 close to the first laser galvanometer 211 is greater than 90 degrees. The first angle α is the laser incident cutting angle of the second laser cutting component 22, which 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 pole piece material 11 caused by repeated cutting, thereby solving the problem of foil leakage and reducing the risk of short circuit after the pole piece is assembled into a core package.

[0055] In a preferred embodiment, the step of adjusting the position of the second laser cutting assembly 22 according to the pole sheet 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 pole sheet strip 1 and the position information of the second laser cutting assembly 22; determining the first angle between the line between the center point of the second laser galvanometer 221 and the tab cutting line L2 and the surface of the pole sheet material 11 close to 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 angle is less than or equal to 90 degrees or greater than 150 degrees, 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 angle is greater than 90 degrees and less than or equal to 150 degrees.

[0056] In this preferred embodiment, after the position adjustment of the second laser cutting assembly 22 is completed, the first 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 pole piece material 11 close to 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 angle α should be greater than 90 degrees and less than or equal to 150 degrees, so as to ensure that while increasing the laser incident cutting angle of the second laser cutting assembly 22, the laser incident cutting angle of the second laser cutting assembly 22 is prevented from being too large, causing the foil to leak from the back of the pole piece.

[0057] Furthermore, in the steps of using the first laser cutting component to reciprocately cut the pole sheet material along the pole sheet cutting line to form a pole sheet, and using the second laser cutting component to reciprocately cut the pole tab foil along the pole tab cutting line to form a pole tab, at least one laser cutting component unit is used to cut the pole sheet strip, and each laser cutting component unit includes a first laser cutting component 21 and two second laser cutting components 22, the first laser cutting component 21 is arranged between the two second laser cutting components 22, and the two second laser cutting components 22 in the same laser cutting component unit are respectively configured to cut the pole tab foil on both adjacent sides of the pole tab.

[0058] In this embodiment, as shown in Figure 4, the pole piece 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 arranged 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.

[0059] The first laser cutting assembly 21 is configured to cut the pole sheet material 11 along the pole sheet cutting line L1, one of the two second laser cutting assemblies 22 cuts the pole tab foil 12 on the left side of the pole tab along the corresponding pole tab cutting line, and the other of the two second laser cutting assemblies 22 cuts the pole tab foil 12 on the right side of the pole tab along the corresponding pole tab cutting line. In this way, by increasing the number of second laser cutting assemblies 22, the pole tab foils on the left and right sides of the pole tab can be cut at the same time, which can improve the cutting efficiency of the pole tab die-cutting device.

[0060] In a preferred embodiment, a plurality of laser cutting assembly units are used to cut the pole piece strip. The number of laser cutting assembly units may be 2 or 3 or more. The plurality of laser cutting assembly units may be arranged side by side and spaced apart along the first direction X.

[0061] Furthermore, the pole piece die-cutting method further includes: adjusting the center points of the plurality of second laser galvanometers 221 to be on the same straight line.

[0062] 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 assemblies 22 is parallel to the first direction X and the tab cutting line L2, thereby ensuring that the cutting effects of the multiple different second laser cutting assemblies 22 are consistent.

[0063] Furthermore, the first laser cutting assembly 21 includes a first laser corresponding to the first laser galvanometer 211 , and the second laser cutting assembly 22 includes a second laser corresponding to the second laser galvanometer 221 . Both the first laser and the second laser are picosecond lasers.

[0064] Furthermore, the power of the first laser is greater than or equal to 5 MW and less than or equal to 10 MW, and the power of the second laser is greater than or equal to 5 MW and less than or equal to 10 MW.

[0065] Specifically, the power of the first laser and the second laser can be, but is not limited to, 5 MW, 6 MW, 8 MW, or 10 MW. A power between 5 MW and 10 MW is sufficient to ensure that the first laser cutting assembly and the second laser cutting assembly can cut the pole piece strip. In practical applications, the power of the first laser and the second laser can be equal or different, and this is not a limitation.

[0066] Please refer to Figures 6 and 7. Figure 6 is a top view of another electrode die-cutting device, and Figure 7 is a front view of another electrode die-cutting device provided by an embodiment of the present application. Its structure is roughly the same as that of the electrode die-cutting device described in Figure 3, with the difference that: the electrode die-cutting device also includes a plurality of conveying members 3 and a plurality of tab smoothing members 4. The tab smoothing members 4 are arranged near the outer circumference of 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 sheet material 11 is partially attached to the outer circumference of the conveying member 3, and the tab foil 12 passes through the gap between the tab smoothing members 4 and the conveying member 3. The tab smoothing members 4 can smooth the curled tab foil 12.

[0067] It should be noted that Figure 6 only illustrates the relative position relationship between the conveying member 3, the tab smoothing member 4 and the first laser cutting assembly 21, the second laser cutting assembly 22 and the pole piece strip, and does not represent the number of rollers 3 and tab smoothing members 4 in actual application.

[0068] In this embodiment, the conveyor 3 is a cylindrical roller, with the pole piece material 11 partially attached to its outer circumference. Driven by a driving roller (not shown), the pole piece material 11 can move in a first direction X, and the roller can rotate with the movement of the pole piece material 1. The projection of the line connecting the center point of the first laser galvanometer 211 and the midpoint of the centerline of the roller along the third direction X is parallel to the first direction X.

[0069] In one embodiment, the position of the first laser cutting assembly 21 can be adjusted according to the position of the conveyor 3. According to the pole piece strip, the step of adjusting the position of the first laser cutting assembly includes: judging whether the orthographic projection of the line between 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 according to the position information of the conveyor 3 and the position information of the first laser cutting assembly 21; if not, determining the first distance compensation value of the first laser cutting assembly 21 along the second direction Y according to the position information of the conveyor 3 and the position information of the first laser cutting assembly 21; 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 between 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.

[0070] 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. According to the pole piece strip, the step of adjusting the position of the second laser cutting assembly 22 includes: judging 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 according to the position information of the tab smoothing member 4 and the position information of the second laser cutting assembly 22; 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 pole piece cutting area; if the position of the center point of the second laser galvanometer 221 meets any one of the above two conditions, then the surface The position of the center point of the second laser galvanometer meets the cutting conditions, and there is no need to adjust the position of the second laser cutting assembly 22. If neither of the above conditions is met, that is, the second distance compensation value of the second laser cutting assembly 22 along the second direction Y is determined based on the position information of the tab smoothing member 4 and the position information of the second laser cutting assembly 22. According to 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 tab smoothing member 4 in the third direction Z is parallel to the first direction X, or the center point of the second laser galvanometer 221 is within a preset distance range on the side of the tab smoothing member 4 away from the electrode cutting area. As long as either of the above two conditions is met, the second laser cutting assembly 22 can be adjusted to a position that meets the cutting conditions.

[0071] 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 piece 4 in the third direction Z is parallel to the first direction X, that is, the center point of the second laser galvanometer 221 is flush with the center points of the multiple tab smoothing pieces 4 in the first direction X.

[0072] Furthermore, the preset distance range is greater than or equal to 0 and less than or equal to 10 mm.

[0073] 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 including but not limited to 0, 2, 4, 6, 8 or 10 mm, and only needs to be between 0 and 10 mm. This ensures that the laser incident cutting angle of the second laser galvanometer 221 is greater than 90 degrees.

[0074] In this embodiment, the pole piece 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 configured to obtain the size parameters and position information of the pole piece strip, the position information of the first laser cutting assembly, and the position information of the second laser cutting assembly.

[0075] Specifically, the camera assembly is a CCD camera. When the electrode strip is conveyed to the cutting area, the conveying mechanism and the electrode strip stop moving, and the CCD camera is used to capture photos of the electrode strip, the first laser cutting assembly, and the second laser cutting assembly. Based on the photos, the dimensional parameters of the electrode strip, the position information of the first laser cutting assembly, and the position information of the second laser cutting assembly can be obtained.

[0076] In this embodiment, the dimension parameter of the electrode sheet strip 1 is the width of the electrode sheet material 11 along the second direction Y. The width of the electrode sheet material 11 along the second direction Y is the length of the electrode sheet cutting line L1. The coordinates of the electrode sheet cutting line L1 and the coordinates of the midpoint of the electrode sheet cutting line L1 can be determined based on the width of the electrode sheet material 11 along the second direction Y and the position information of the electrode sheet material 11. The position information of the first laser cutting assembly refers to the coordinates of the center point of the first laser galvanometer, and the position information of the second laser cutting assembly refers to the coordinates of the center point of the second laser galvanometer.

[0077] In this embodiment, the control component is in communication with the camera component and is configured 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 pole piece strip, the position information of the first laser cutting component, and the position information of the second laser cutting component. Specifically, the control component may be a computer.

[0078] The first drive assembly 6 is in communication with the control assembly 5 and is connected to the first laser cutting assembly 21. The first drive assembly 6 is configured to drive the first laser cutting assembly 21 to move along the second direction Y to directly above the electrode sheet cutting line L1 according to the first distance compensation value. The second drive assembly (not shown) is in communication with the control assembly and is connected to the second laser cutting assembly 22. The second drive assembly is configured to drive the second laser cutting assembly 22 to move along the second direction Y to above the electrode tab cutting area according to the second distance compensation value.

[0079] In one embodiment, as shown in FIG8 , FIG8 is a schematic structural diagram of the first laser cutting assembly and the first drive assembly. Taking the first drive assembly 6 as an example, the first drive assembly 6 includes a servo driver 61, a servo motor 62, and a screw 63. The servo driver 61 is respectively connected to the control assembly 5 and the servo motor 62 for communication. The screw 63 is connected to the servo motor 62 for transmission. The screw 63 passes through a fixing member 64 and is threadedly connected to the fixing member 64. The fixing member 64 can be a screw fixing rod. The screw 63 is rotatably connected to the first laser cutting assembly 21.

[0080] The control assembly 5 transmits the first distance compensation value to the servo driver 61. The servo driver 61 controls the servo motor 62 to rotate and drive the screw 63. Driven by the screw 63, the first laser cutting assembly 21 moves along the second direction Y to directly above the electrode cutting line L1. The structure and operating principle of the second drive assembly are the same as those of the first drive assembly and are not further described here.

[0081] Beneficial effects of the present application: In the present application, the electrode die-cutting method includes conveying the electrode strip along a first direction to the cutting area of ​​the electrode die-cutting device, the electrode material of the electrode strip is opposite to the electrode cutting area of ​​the cutting area, and the pole tab foil of the electrode strip is opposite to the pole tab cutting area of ​​the cutting area; according to the electrode strip, the positions of the first laser cutting component and the second laser cutting component of the electrode die-cutting device are adjusted 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 side of the pole tab cutting line away from the pole tab cutting area; the first laser cutting component is used to perform reciprocating cutting of the electrode material along the pole tab cutting line to form a pole piece, and the second laser cutting component is used to perform reciprocating cutting of the pole tab foil along the pole tab cutting line to form a pole tab. By placing the first laser galvanometer of the first laser cutting assembly above the pole piece cutting line and the second laser galvanometer of the second laser cutting assembly above the pole tab cutting area, the laser incident cutting angles of the first laser cutting assembly and the second laser cutting assembly are increased. This can avoid repeated cutting of the same position to cause serious vaporization of the surface material of the pole tab foil, thereby solving the problem of foil leakage caused by laser cutting and reducing the risk of short circuit after the pole pieces are assembled into core packages.

[0082] An embodiment of the present application provides a pole piece die-cutting device, which is configured to cut a pole piece strip.

[0083] Please refer to Figure 3. The pole sheet material strip 1 includes a pole sheet material 11 and a tab foil 12. The pole sheet material 11 includes a layer of metal foil and two layers of substrate. The metal foil is sandwiched between the two layers of substrate. The tab foil 12 has only one layer of metal foil. The metal foil of the tab foil 12 and the metal foil of the pole sheet material 11 can be different parts of the same metal foil. The only difference is that the upper and lower surfaces of the metal foil of the tab foil 12 are not covered by the substrate.

[0084] The pole piece die-cutting device 2 has a pole piece cutting area and a pole tab cutting area. The pole piece cutting area is opposite to the pole piece material 11, and the pole tab cutting area is opposite to the pole tab foil 12. When the conveying device conveys the pole piece material 11 to the pole piece die-cutting device, the pole piece cutting area is configured to carry the pole piece material 11, and the pole tab cutting area is configured to carry the pole tab foil 12.

[0085] It should be noted that since the pole sheet cutting area is opposite to the pole sheet material 11 and the tab cutting area is opposite to the tab foil 12, Figure 1 does not illustrate the pole sheet cutting area and the tab cutting area. The area where the pole sheet material 11 is located can be regarded as the pole sheet cutting area, and the area where the tab foil 12 is located can be regarded as the tab cutting area.

[0086] As shown in Figures 3 and 4, the pole piece die-cutting device includes a first laser cutting component 21 and a second laser cutting component 22. The first laser cutting component 21 is configured to perform reciprocating cutting of the pole piece material 11 transported to the pole piece cutting area along the preset pole piece cutting line L1 to form a pole piece, and the second laser cutting component 22 is configured to perform reciprocating cutting of the pole piece foil 12 transported to the pole tab cutting area along the preset pole tab cutting line L2 to form a pole tab.

[0087] The transmission direction of the electrode strip 1 is parallel to the first direction X, the electrode cutting line L1 is parallel to the second direction Y, and the tab cutting line L2 is parallel to the first direction X. The first direction X and the second direction Y intersect. In this embodiment, the first direction X and the second direction Y are perpendicular. 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 form an angle of, but not limited to, 30 degrees, 45 degrees, or 60 degrees.

[0088] The pole piece cutting line L1 can be regarded as the laser path of the first laser cutting component 21 for cutting the pole piece material 11. The pole piece cutting line L1 is located in the pole piece cutting area. The first laser cutting component 21 can cut the pole piece material 11 along the pole piece cutting line L1 to form a pole piece. The tab cutting line L2 can be regarded as the laser path of the second laser cutting component 22 for cutting the tab foil 12. The tab cutting line L2 is located at the junction of the pole piece cutting area and the tab cutting area. The second laser cutting component 22 can cut the excess tab foil 12 along the tab cutting line L2 to form a tab. Both the pole piece cutting line L1 and the tab cutting line L2 can be preset and generated by the pole piece die-cutting device and stored in the pole piece die-cutting device. When pole piece cutting is required, the corresponding preset pole piece cutting line and tab cutting line can be selected according to different pole pieces.

[0089] Furthermore, the first laser cutting assembly 21 includes a first laser galvanometer 211 , and the center point of the first laser galvanometer 211 is located above the pole piece cutting line L1 .

[0090] As shown in FIG4 , the center point of the first laser galvanometer 211 is located above the pole piece cutting line L1, that is, the orthographic projection of the center point of the first laser galvanometer 211 along the third direction Z falls on the pole piece cutting line L1, the third direction Z is perpendicular to the first direction X and the second direction Y, and the line between the center point of the first laser galvanometer 211 and the pole piece cutting line L1 is perpendicular to the first direction X. By placing the center point of the first laser galvanometer 211 above the pole piece cutting line L1, the laser incident cutting angle when the first laser galvanometer 211 cuts the pole piece material 11 can be made 90 degrees, thereby ensuring that the upper substrate of the two pole pieces located on both sides of the pole piece cutting line L1 has the same degree of vaporization in the cutting area.

[0091] Preferably, the center point of the first laser galvanometer 211 overlaps with the midpoint of the pole piece cutting line L1 in the third direction Z, that is, the center point of the first laser galvanometer 211 is located above the midpoint of the pole piece cutting line L1. The pole piece material 11 is symmetrical about the pole piece center line L3, and the pole piece center line L3 passes through the midpoint of the pole piece cutting line L1. Because the effective cutting range of the first laser galvanometer 211 is symmetrical about the center point of the first laser galvanometer 211, by positioning the center point of the first laser galvanometer 211 above the midpoint of the pole piece cutting line L1, it can be ensured that the upper substrate of the pole piece on both sides of the pole piece center line L3 has a consistent degree of vaporization in the cutting area.

[0092] Furthermore, the second laser cutting assembly 22 includes a second laser galvanometer 221 , and the center point of the second laser galvanometer 221 is located above the tab cutting area.

[0093] As shown in FIG4 , the center point of the second laser galvanometer 221 is located above the tab cutting area, and the orthographic projection of the center point of the second laser galvanometer 221 along the third direction Z is located within the tab cutting area.

[0094] As shown in Figures 4 and 5, the angle α between the line between the center point of the second laser galvanometer 221 and the tab cutting line L2 and the surface of the pole sheet material 11 close to the first laser galvanometer 211 is greater than 90 degrees. The angle between the line between the center point of the second laser galvanometer 221 and the tab cutting line L2 and the surface of the pole sheet material 11 close to the first laser galvanometer 211 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 pole sheet material 11 caused by repeated cutting, thereby solving the problem of foil leakage and reducing the risk of short circuit after the pole sheet is assembled into a core package.

[0095] Specifically, the 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 pole sheet material 11 close to 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 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 pole sheet material 11 close to the first laser galvanometer 211 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 assembly 22, it avoids the situation where the laser incident cutting angle of the second laser cutting assembly 22 is too large, causing the foil to leak from the back of the pole sheet.

[0096] It should be noted that the center point of the first laser galvanometer 211 refers to the geometric center point of the first laser galvanometer 211, that is, the light output center of the first laser galvanometer 211. The same is true for the center point of the second laser galvanometer 221, which will not be repeated here.

[0097] In this embodiment, the first laser cutting assembly 21 and the second laser cutting assembly 22 cut the electrode material strip simultaneously, which can improve the cutting efficiency of the tab die-cutting device. In other embodiments, the first laser cutting assembly 21 and the second laser cutting assembly 22 can also cut the electrode material strip sequentially, which is not limited here.

[0098] Furthermore, the pole piece die-cutting device includes at least one laser cutting component unit, each laser cutting component unit includes a first laser cutting component 21 and two second laser cutting components 22, the first laser cutting component 21 is arranged between the two second laser cutting components 22, and the two second laser cutting components 22 in the same laser cutting component unit are respectively configured to cut the pole piece foil on the adjacent two sides of the pole piece.

[0099] In this embodiment, as shown in Figure 4, the pole piece 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 arranged 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.

[0100] The first laser cutting assembly 21 is configured to cut the pole sheet material 11 along the pole sheet cutting line L1, one of the two second laser cutting assemblies 22 cuts the pole tab foil 12 on the left side of the pole tab along the corresponding pole tab cutting line, and the other of the two second laser cutting assemblies 22 cuts the pole tab foil 12 on the right side of the pole tab along the corresponding pole tab cutting line. In this way, by increasing the number of second laser cutting assemblies 22, the pole tab foils on the left and right sides of the pole tab can be cut at the same time, which can improve the cutting efficiency of the pole tab die-cutting device.

[0101] In some other embodiments, the number of laser cutting assembly units in the pole piece die-cutting device is not limited to one as in the above embodiment, and may include two, three, or more laser cutting assembly units, and multiple laser cutting assembly units may be arranged side by side and spaced apart along the first direction X. In this structure, the pole piece die-cutting device may include multiple second laser cutting assemblies 22, and the center points of the second laser galvanometers 221 of the multiple second laser cutting assemblies 22 are located on the same straight line.

[0102] Preferably, the line connecting the center points of the second laser galvanometers 221 of the plurality of second laser cutting assemblies 22 is parallel to the first direction X and the tab cutting line L2 , thereby ensuring that the cutting effects of the plurality of different second laser cutting assemblies 22 are consistent.

[0103] Furthermore, the first laser cutting assembly 21 includes a first laser corresponding to the first laser galvanometer 211 , and the second laser cutting assembly 22 includes a second laser corresponding to the second laser galvanometer 221 . Both the first laser and the second laser are picosecond lasers.

[0104] Furthermore, the power of the first laser is greater than or equal to 5 MW and less than or equal to 10 MW, and the power of the second laser is greater than or equal to 5 MW and less than or equal to 10 MW.

[0105] Specifically, the power of the first laser and the second laser can be, but is not limited to, 5 MW, 6 MW, 8 MW, or 10 MW. A power between 5 MW and 10 MW is sufficient to ensure that the first laser cutting assembly and the second laser cutting assembly can cut the pole piece strip. In practical applications, the power of the first laser and the second laser can be equal or different, and this is not a limitation.

[0106] Please refer to Figures 6 and 7. The structure is substantially the same as that of the electrode die-cutting device described in Figure 1, with the difference that the electrode die-cutting device further comprises a plurality of conveying members 3 and a plurality of tab smoothing members 4. The tab smoothing members 4 are arranged near the outer circumference of one end of the conveying members 3. The tab smoothing members 4 can be located above or below the conveying members 3. The electrode sheet material 11 is partially attached to the outer circumference of the conveying members 3, and the tab foil 12 passes through the gap between the tab smoothing members 4 and the conveying members 3. The tab smoothing members 4 can smooth the curled tab foil 12.

[0107] It should be noted that Figure 6 only illustrates the relative position relationship between the conveying member 3, the tab smoothing member 4 and the first laser cutting assembly 21, the second laser cutting assembly 22 and the pole piece strip, and does not represent the number of rollers and tab smoothing members 4 in actual application.

[0108] In this embodiment, the conveyor 3 is a cylindrical roller, with the pole piece material 11 partially attached to its outer circumference. Driven by a driving roller (not shown), the pole piece material 11 can move in a first direction X, and the roller can rotate with the movement of the pole piece material 1. The projection of the line connecting the center point of the first laser galvanometer 211 and the midpoint of the centerline of the roller along the third direction X is parallel to the first direction X.

[0109] In one embodiment, the center point of the tab smoothing member 4 is located in the tab cutting area, and 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 along the third direction Z is parallel to the first direction X.

[0110] In one embodiment, as shown in FIG6 , the center point of the second laser galvanometer 221 and the center point of the tab smoothing member 4 are located away from one side of the pole piece cutting area.

[0111] Furthermore, a distance d between a center point of the second laser galvanometer 221 and a center point of the tab smoothing member 4 along the second direction Y is greater than or equal to 0 and less than or equal to 10 mm.

[0112] 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 including but not limited to 0, 2, 4, 6, 8 or 10 mm, and only needs to be between 0 and 10 mm. This ensures that the laser incident cutting angle of the second laser galvanometer 221 is greater than 90 degrees.

[0113] In one embodiment, the positions of the first laser cutting assembly and the second laser cutting assembly can be manually adjusted so that the center point of the first laser galvanometer 211 is located directly above the pole piece cutting line L1, and the center point of the second laser galvanometer 221 is located above the pole tab cutting area.

[0114] In one embodiment, the pole piece die-cutting device can automatically adjust the positions of the first laser cutting assembly and the second laser cutting assembly. The pole piece die-cutting device also includes a camera assembly, a control assembly 5, a first drive assembly 6 and a second drive assembly.

[0115] In this embodiment, the camera assembly is configured to obtain the size parameters and position information of the pole piece strip, the position information of the first laser cutting assembly, and the position information of the second laser cutting assembly.

[0116] Specifically, the camera assembly is a CCD camera. When the electrode strip is conveyed to the cutting area, the conveying mechanism and the electrode strip stop moving, and the CCD camera is used to capture photos of the electrode strip, the first laser cutting assembly, and the second laser cutting assembly. Based on the photos, the dimensional parameters of the electrode strip, the position information of the first laser cutting assembly, and the position information of the second laser cutting assembly can be obtained.

[0117] In one embodiment, as shown in FIG8 , FIG8 is a schematic structural diagram of the first laser cutting assembly and the first drive assembly provided in an embodiment of the present application. Taking the first drive assembly 6 as an example, the first drive assembly 6 includes a servo driver 61, a servo motor 62, and a screw 63. The servo driver 61 is respectively connected to the control assembly 5 and the servo motor 62 for communication. The screw 63 is connected to the servo motor 62 for transmission. The screw 63 passes through a fixing member 64 and is threadedly connected to the fixing member 64. The fixing member 64 can be a screw fixing rod. The screw 63 is rotatably connected to the first laser cutting assembly 21.

[0118] Beneficial effects of the present application: In the present application, the pole piece die-cutting device includes a first laser cutting component and a second laser cutting component. The first laser cutting component is configured to perform reciprocating cutting along the pole piece cutting line on the pole piece material transported to the pole piece cutting area to form a pole piece, and the second laser cutting component is configured to perform reciprocating cutting along the pole piece cutting line on the pole piece foil transported to the pole tab cutting area to form a pole tab. By placing the first laser galvanometer above the pole piece cutting line and placing the second laser galvanometer of the second laser cutting component above the pole tab cutting area, the laser incident cutting angle of the first laser cutting component and the second laser cutting component is increased, thereby avoiding repeated cutting of the same position to cause serious vaporization of the upper surface material of the pole tab foil, thereby solving the problem of foil leakage caused by laser cutting and reducing the risk of short circuit after the pole piece is assembled into a core package.

[0119] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other variations or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the claims of the present application.

Claims

1. A pole piece die cutting method, comprising: The pole piece strip is conveyed along a first direction to a cutting area of ​​a pole piece die-cutting device, wherein the pole piece material of the pole piece strip is opposite to the pole piece cutting area of ​​the cutting area, and the pole tab foil of the pole piece strip is opposite to the pole tab cutting area of ​​the cutting area; According to the pole piece strip, adjust the positions of the first laser cutting assembly and the second laser cutting assembly of the pole piece die-cutting device so that the center point of the first laser galvanometer of the first laser cutting assembly is located above the preset pole piece cutting line, and the center point of the second laser galvanometer of the second laser cutting assembly is located above the pole ear cutting area; The first laser cutting assembly is used to reciprocately cut the pole sheet material along the pole sheet cutting line to form a pole sheet, and the second laser cutting assembly is used to reciprocately cut the pole tab foil along the pole tab cutting line to form a pole tab; The electrode sheet cutting line is parallel to the second direction, the electrode tab cutting line is parallel to the first direction, and the first direction intersects with the second direction.

2. The pole piece die cutting method according to claim 1, wherein: The step of adjusting the positions of the first laser cutting assembly and the second laser cutting assembly of the pole piece die-cutting device according to the pole piece strip comprises: Obtaining the size parameters and position information of the pole piece strip, the position information of the first laser cutting component, and the position information of the second laser cutting component; Determine a first distance compensation value of the first laser cutting assembly along the second direction and a second distance compensation value of the second laser cutting assembly along the second direction according to the size parameters and position information of the pole piece strip, the position information of the first laser cutting assembly and the position information of the second laser cutting assembly; According to the first distance compensation value and the second distance compensation value, the positions of the first laser cutting assembly and the second laser cutting assembly are adjusted so that the center point of the first laser galvanometer is located above the pole piece cutting line, and the center point of the second laser galvanometer is located above the pole ear cutting area.

3. The pole piece die cutting method according to claim 2, wherein: According to the pole piece strip, the step of adjusting the position of the first laser cutting component comprises: Determine the coordinates of the midpoint of the pole piece cutting line and the coordinates of the center point of the first laser galvanometer according to the size parameters and position information of the pole piece strip and the position information of the first laser cutting assembly; Determining the first distance compensation value of the first laser cutting assembly according to the coordinates of the midpoint of the pole piece cutting line and the coordinates of the center point of the first laser galvanometer; According to the first distance compensation value, the position of the first laser cutting assembly is adjusted so that the center point of the first laser galvanometer overlaps with the midpoint of the pole piece cutting line in a third direction, and the third direction is perpendicular to the first direction and the second direction.

4. The pole piece die cutting method according to claim 3, wherein: The pole piece material is symmetrical about the pole piece center line, the pole piece center line is parallel to the first direction, and the pole piece center line intersects the pole piece cutting line at the midpoint of the pole piece cutting line.

5. The pole piece die cutting method according to claim 3, wherein: After the position adjustment of the first laser cutting assembly is completed, the line between the center point of the first laser galvanometer and the pole piece cutting line is perpendicular to the first direction.

6. The pole piece die cutting method according to claim 2, wherein: According to the pole piece strip, the step of adjusting the position of the second laser cutting assembly comprises: Determine the distance between the center point of the second laser galvanometer and the tab cutting line along the second direction according to the size parameters and position information of the pole piece strip and the position information of the second laser cutting assembly; Determine a first angle between a line connecting a center point of the second laser galvanometer and the tab cutting line and a surface of the pole sheet material close to the first laser galvanometer; If the first 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 according to the distance between the center point of the second laser galvanometer and the tab cutting line along the second direction and the height of the second laser galvanometer; According to the second distance compensation value, the position of the second laser cutting component is adjusted so that the first angle is greater than 90 degrees and less than or equal to 150 degrees.

7. The pole piece die cutting method according to any one of claims 1 to 6, wherein: In the step of using the first laser cutting assembly to reciprocately cut the pole sheet material along the pole sheet cutting line to form the pole sheet, and using the second laser cutting assembly to reciprocately cut the pole tab foil along the pole tab cutting line to form the pole tab, at least one laser cutting assembly unit is used to cut the pole sheet material strip, each of the laser cutting assembly units includes a first laser cutting assembly and two second laser cutting assemblies, and the first laser cutting assembly is arranged between the two second laser cutting assemblies; Wherein, the two second laser cutting assemblies in the same laser cutting assembly unit are respectively configured to cut the tab foil on two adjacent sides of the tab.

8. The pole piece die cutting method according to claim 7, wherein: The pole piece strip is cut using a plurality of laser cutting assembly units, and the pole piece die-cutting method further comprises: The center points of the plurality of the second laser galvanometers are adjusted to be on the same straight line.

9. The pole piece die cutting method according to any one of claims 1 to 6, wherein: The pole piece material is partially attached to the outer peripheral surface of the conveying member of the pole piece die-cutting device, and the pole tab foil passes through the gap between the pole tab smoothing member of the pole piece die-cutting device and the conveying member. According to the pole piece material strip, the step of adjusting the position of the first laser cutting assembly includes: According to the position information of the transmission member and the position information of the first laser cutting assembly, determining whether the orthographic projection of the line between the center point of the first laser galvanometer and the center point of the transmission member along the third direction is parallel to the first direction; If not, determining a first distance compensation value of the first laser cutting assembly along the second direction according to the position information of the conveying member and the position information of the first laser cutting assembly; According to the first distance compensation value, the position of the first laser cutting component is adjusted so that the orthographic projection of the line between the center point of the first laser galvanometer and the center point of the transmission member along the third direction is parallel to the first direction.

10. The pole piece die cutting method according to claim 9, wherein: According to the pole piece strip, the step of adjusting the position of the second laser cutting assembly comprises: According to the position information of the tab smoothing piece and the position information of the second laser cutting assembly, determine whether the projection of the line connecting the center point of the second laser galvanometer and the center point of the tab smoothing piece in the third direction is parallel to the first direction; or whether the center point of the second laser galvanometer is within a preset distance range on the side of the center point of the tab smoothing piece away from the pole piece cutting area; If neither is the case, determining a second distance compensation value of the second laser cutting assembly along the second direction according to the position information of the tab smoothing member and the position information of the second laser cutting assembly; According to the second distance compensation value, the position of the second laser cutting assembly is adjusted so that the projection of the line connecting the center point of the second laser galvanometer and the center point of the pole tab smoothing piece in the third direction is parallel to the first direction, or the center point of the second laser galvanometer is located within a preset distance range on the side of the pole tab smoothing piece away from the pole piece cutting area.

11. A pole piece die-cutting device, configured to cut a pole piece strip, the pole piece strip having a pole piece material and a pole tab foil, the pole piece material being opposite to a pole piece cutting region of the pole piece die-cutting device, the pole tab foil being opposite to a pole tab cutting region of the pole piece die-cutting device, the pole piece die-cutting device comprising: A first laser cutting assembly is configured to reciprocately cut the pole piece material conveyed to the pole piece cutting area along a preset pole piece cutting line to form a pole piece, the conveying direction of the pole piece material strip is parallel to a first direction, the pole piece cutting line is located in the pole piece cutting area and is parallel to a second direction, the first direction intersects with the second direction, and the first laser cutting assembly includes a first laser galvanometer, the center point of the first laser galvanometer is located above the pole piece cutting line; The second laser cutting component is configured to reciprocately cut the tab foil delivered to the tab cutting area along a preset tab cutting line to form a tab, wherein the tab cutting line is located at the junction of the pole piece cutting area and the tab cutting area and is parallel to the first direction, and the second laser cutting component includes a second laser galvanometer, and the center point of the second laser galvanometer is located above the tab cutting area.

12. The pole piece die cutting device according to claim 11, wherein: The center point of the first laser galvanometer overlaps with the midpoint of the pole piece cutting line in a third direction, and the third direction is perpendicular to the first direction and the second direction.

13. The pole piece die cutting device according to claim 11, wherein: A line between the center point of the first laser galvanometer and the pole piece cutting line is perpendicular to the first direction.

14. The pole piece die cutting device according to claim 11, wherein: The angle between the line connecting the center point of the second laser galvanometer and the tab cutting line and the surface of the pole sheet material close to the first laser galvanometer is greater than 90 degrees and less than or equal to 150 degrees.

15. The pole piece die cutting device according to claim 11, wherein: The pole piece die-cutting device comprises at least one laser cutting assembly unit, each of the laser cutting assembly units comprises one first laser cutting assembly and two second laser cutting assemblies, and the first laser cutting assembly is arranged between the two second laser cutting assemblies; Wherein, the two second laser cutting assemblies in the same laser cutting assembly unit are respectively configured to cut the tab foil on two adjacent sides of the tab.

16. The pole piece die cutting device according to claim 15, wherein: The pole piece die-cutting device comprises a plurality of the second laser galvanometers, and the center points of the plurality of the second laser galvanometers are located on the same straight line; Alternatively, a line connecting the center points of the plurality of second laser galvanometers is parallel to the tab cutting line.

17. The pole piece die cutting device according to claim 11, wherein: The electrode sheet die-cutting device further comprises a conveying member and a tab smoothing member, wherein the tab smoothing member is spaced apart from the conveying member, the electrode sheet material is partially attached to the outer peripheral surface of the conveying member, and the tab foil passes through the gap between the tab smoothing member and the conveying member; Wherein, the projection of the line connecting the center point of the first laser galvanometer and the midpoint of the center line of the transmission member in the third direction is parallel to the first direction; The projection of the line connecting the center point of the second laser galvanometer and the center point of the pole tab smoothing piece in the third direction is parallel to the first direction; or, the center point of the second laser galvanometer and the center point of the pole tab smoothing piece are away from one side of the pole piece cutting area, and the third direction is perpendicular to the first direction and the second direction.

18. The pole piece die cutting device according to claim 17, wherein: A distance between a center point of the second laser galvanometer and a center point of the tab smoothing member along the second direction is greater than or equal to 0 and less than or equal to 10 mm.

19. The pole piece die cutting device according to any one of claims 11 to 18, wherein: The first laser cutting component includes a first laser corresponding to the first laser galvanometer, and the second laser cutting component includes a second laser corresponding to the second laser galvanometer. Both the first laser and the second laser are picosecond lasers.

20. The pole piece die cutting device according to any one of claims 11 to 18, wherein: The pole piece die-cutting device also includes: A camera assembly configured to obtain size parameters and position information of the pole piece strip, position information of the first laser cutting assembly, and position information of the second laser cutting assembly; a control component, which is in communication with the camera component and is configured to determine 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 according to the size parameters and position information of the pole piece strip, the position information of the first laser cutting component and the position information of the second laser cutting component; a first driving component, which is in communication with the control component, the first driving component is connected to the first laser cutting component, and the first driving component is configured to drive the first laser cutting component to move above the pole piece cutting line along the second direction according to the first distance compensation value; and The second drive component is communicatively connected to the control component, the second drive component is connected to the second laser cutting component, and the second drive component is configured to drive the second laser cutting component to move above the tab cutting area along the second direction according to the second distance compensation value.

Images