A laser cutting method and apparatus

Abstract

The application provides a laser cutting method and device, and the laser cutting method is used for cutting a material belt with formed tabs, and comprises the following steps: placing the material belt on a moving piece, the moving piece adsorbs the material belt and drives the material belt to move; and continuously performing a cutting-off action and a round corner cutting action on a coating area of the material belt by using a moving laser beam, so as to form a tab with a round corner. By placing the material belt on the moving piece, the moving piece adsorbs the material belt and drives the material belt to move; and continuously performing the cutting-off action and the round corner cutting action on the coating area of the material belt by using the moving laser beam, the cutting-off action and the round corner cutting action can be continuously realized by the laser beam emitted by one laser, the method is simple to operate, the cutting-off action and the round corner cutting action on the material belt can be conveniently realized, and the efficiency in the tab processing process can be improved.

Description

Technical Field

[0001] This application relates to the field of battery processing technology, specifically to a laser cutting method and apparatus. Background Technology

[0002] In the production process of stacked batteries, the material strip needs to be cut into electrode sheets. First, the electrode tabs are cut out on the material strip to form multiple electrode tabs. Then, a laser beam is emitted from a laser to cut off the electrode sheets with rounded corners. In the existing technology, the above operation can only be achieved by using at least two lasers or by repeating the same steps at different work stations. The operation is cumbersome and the production efficiency is low. Summary of the Invention

[0003] In view of this, this application provides a laser cutting method that solves the problems of cumbersome operation and low production efficiency in the electrode cutting process. This application also provides a laser cutting apparatus suitable for the above-mentioned laser cutting method.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A laser cutting method for cutting strips with pre-formed tabs includes the following steps:

[0006] The material strip is placed on the moving part, and the moving part attracts the material strip and drives the material strip to move;

[0007] A moving laser beam is used to continuously cut and round the corners of the coated area of ​​the strip to form an electrode with rounded corners.

[0008] Optionally, when using a laser beam to cut the strip, the movement trajectory of the laser beam sequentially includes a first path for processing the first rounded corner, a second path for processing the second rounded corner, a third path for processing the third rounded corner, a fourth path for cutting the electrode sheet from the strip, and a fifth path for processing the fourth rounded corner.

[0009] Optionally, the path between the first path and the second path includes a laser-off idle switching path.

[0010] Optionally, the first path, the second path, the third path, and the fifth path each include a first sub-path located within the coating area and a second sub-path extending beyond the coating area.

[0011] Optionally, the movement trajectories of the laser beams do not intersect.

[0012] Optionally, the material strip moves continuously under the drive of the moving member, and:

[0013] When the laser beam has completed its movement along the second path, the laser beam stops moving; when the laser beam reaches the third rounded corner processing area, the laser beam moves along the third path.

[0014] And / or,

[0015] When the laser beam completes its movement along the fifth path, the laser beam stops moving; when the laser beam reaches the first rounded corner processing area of ​​the next electrode, the laser beam moves along the first path.

[0016] Optionally, the laser beam moves along the moving trajectory, and the moving component drives the material strip to move, forming a cutting trajectory for the material strip. The cutting trajectory includes a first arc segment forming the first rounded corner, a second arc segment forming the second rounded corner, a third arc segment forming the third rounded corner, a first line segment cutting the electrode sheet from the material strip, and a fourth arc segment forming the fourth rounded corner; wherein:

[0017] The first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are all arc segments that protrude from the middle of the electrode sheet to the outside of the electrode sheet.

[0018] Optional,

[0019] The processing cycle of the material strip and the moving speed of the material strip driven by the moving part are calculated based on the size parameters of the material strip, and the moving trajectory and scanning speed of the laser beam are obtained by fitting.

[0020] The moving component drives the material belt to move. When it reaches the designated cutting position, the laser is turned on, and the rounded corners and sides of the electrode are cut according to the moving trajectory and scanning rate of the laser beam.

[0021] Optionally, the moving component drives the material belt to move along the length direction of the material belt, and the moving component drives the material belt to move at a constant speed.

[0022] A laser cutting apparatus, suitable for any of the laser cutting methods described above, comprising:

[0023] The moving component is provided with adsorption holes for adsorbing the material strip and drives the material strip to move;

[0024] A laser that emits a laser beam and can control the movement of the laser beam to cut the strip into electrodes.

[0025] Optionally, the moving part includes a cutting groove that coincides with the cutting trajectory.

[0026] Optionally, the movable component includes a first adsorption region of the adsorption electrode and a second adsorption region for adsorbing the cut material.

[0027] Optionally, the end of the first adsorption zone away from the moving direction of the material strip is a chamfered edge, which can adsorb the cut electrode sheet.

[0028] The laser cutting method provided in this application involves placing a strip of material on a moving part, which then attracts and moves the strip. A moving laser beam is used to continuously cut and round the coated area of ​​the strip. This method can achieve both cutting and rounding actions continuously with a single laser beam emitted from a single laser. It is simple to operate, conveniently performs cutting and rounding actions on the strip, and improves the efficiency of electrode processing. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of cutting the material strip into electrode sheets according to this embodiment;

[0031] Figure 2 This is a schematic diagram of the laser beam's trajectory.

[0032] Figure 3 A breakdown diagram of the steps involved in cutting a strip of material into electrode sheets;

[0033] Figure 4 This is a top view of the electrode.

[0034] Figure 5 This is a top view of the moving part;

[0035] Figure 6 for Figure 5 3D view from the perspective of the cross-section at the middle PP section;

[0036] Figure 7 for Figure 5 A schematic diagram of cutting a PP strip into electrode sheets from a cross-sectional view.

[0037] exist Figures 1-7 middle:

[0038] 1-Material strip, 2-Moving component, 3-Electrode sheet, 4-Moving trajectory, 5-Cutting trajectory;

[0039] 11-Coating area, 12-Taper, 13-Cut object, 21-Adsorption hole, 22-Cut groove, 23-First adsorption area, 24-Second adsorption area, 25-Edge chamfer, 31-First rounded corner, 32-Second rounded corner, 33-Third rounded corner, 34-Fourth rounded corner. Detailed Implementation

[0040] This application provides a laser cutting method. This application also provides a laser cutting apparatus suitable for the above-described laser cutting method.

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector and serves as the positive electrode tab. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector protrudes from the coated negative current collector and serves as the negative electrode tab. The material strip is cut to form the electrode of the stacked battery. The coated area of ​​the material strip refers to the area on the current collector coated with the active material layer, while the tab area of ​​the material strip refers to the area on the current collector that is not coated with the active material layer, which is also the area that is cut to form the tab.

[0043] The existing methods for cutting laminated battery electrodes are as follows:

[0044] The tab area of ​​the strip is cut using a laser beam to form the tab; then the coated area of ​​the strip is cut using a metal mold or a specialized laser to form the electrode sheet.

[0045] Based on this, please refer to Figures 1 to 7 This application provides a laser cutting method for cutting a strip 1 with tabs 12 formed thereon to process the strip 1 into an electrode 3 for a stacked battery. The method includes the following steps: placing the strip 1 on a moving part 2, the moving part 2 adsorbing the strip 1 and moving the strip 1; using a moving laser beam to continuously cut and round the corners of the coated area 11 of the strip 1 to form an electrode 3 with rounded corners.

[0046] Specifically, the strip 1 with multiple tabs 12 is placed on the moving part 2. The moving part 2 moves the strip 1, and at the same time, a moving laser beam cuts the strip 1. The laser beam moves as the strip 1 moves, thus forming a dynamic cutting of the strip 1, thereby improving the cutting efficiency of the strip 1. Furthermore, the laser beam continuously cuts and rounds the corners of the coated area 11 of the strip 1, which can quickly cut the electrode 3 with rounded corners from the strip 1, thereby improving the processing efficiency of the electrode 3.

[0047] It should be noted that a moving laser beam is used to continuously perform cutting and rounding actions on the coating area 11 of the strip 1. "Continuous" means that the cutting and rounding actions are performed sequentially, alternating between the two. The laser beam can move continuously or intermittently, and the laser emitting the beam can be switched off and idle for skipping the cutting. Furthermore, the order of the cutting and rounding actions is not limited. The laser beam can be used to perform rounding actions on the strip 1, followed by cutting and then rounding again to form an electrode 3 with rounded corners; alternatively, the laser beam can be used to perform cutting actions on the strip 1 followed by rounding to form an electrode 3 with rounded corners.

[0048] It should also be noted that the cutting action refers to cutting the electrode 3 from the material strip 1 to form the electrode 3; the rounding action refers to cutting off the four sharp corners of the electrode 3 to give the electrode 3 rounded corners.

[0049] The laser cutting method described above involves placing the strip 1 on the moving part 2, which then attracts and moves the strip 1. A moving laser beam is used to continuously cut and round the coating area 11 of the strip 1. This method can achieve both cutting and rounding actions continuously with a single laser beam emitted from a single laser. It is simple to operate, conveniently performs cutting and rounding actions on the strip 1, and improves the efficiency of the electrode 3 processing.

[0050] In some embodiments, when the laser beam cuts the strip 1, the movement trajectory 4 of the laser beam sequentially includes a first path for processing the first rounded corner 31, a second path for processing the second rounded corner 32, a third path for processing the third rounded corner 33, a fourth path for cutting the electrode 3 from the strip 1, and a fifth path for processing the fourth rounded corner 34. Specifically, the moving member 2 drives the strip 1 to move along a first direction, and the laser beam moves sequentially along the first path, the second path, the third path, the fourth path, and the fifth path.

[0051] Among them, Figure 2In the diagram, the first path is from point a to point b, the second path is from point c to point d, the third path is from point d to point e, the fourth path is from point e to point f, and the fifth path is from point f to point a.

[0052] In addition, the moving part 2 also moves in a second direction opposite to the first direction, at which time the movement trajectory 4 of the laser beam is also reversed.

[0053] It should be noted that the first direction is Figure 3 The direction indicated by the middle arrow X1, the second direction is Figure 3 The direction indicated by the middle arrow X2.

[0054] It should also be noted that the laser can emit a laser beam for cutting the material strip, and the galvanometer of the laser controls the movement of the laser beam.

[0055] In some embodiments, the path between the first path and the second path includes a laser-off idle cutting path. Specifically, laser-off idle cutting means that the laser does not emit a laser beam, or the emitted laser beam is blocked or absorbed, that is, no cutting is performed on the strip 1 between the first path and the second path. When the moving member 2 moves the strip 1 and the laser beam moves in coordination to cut the strip 1, the laser beam moves along the first path to cut the first rounded corner 31 of the strip 1, then the laser idles and jumps to the starting point of the second path, then the laser emits a laser beam, and then the laser beam moves along the second path to cut the subsequent second rounded corner 32.

[0056] It should be noted that the laser-off idle cutting path from point b to point c between the first and second paths does not correspond to point B to point C in the actual cutting trajectory. This is only a schematic diagram. The laser-off idle cutting path is only to make the laser beam quickly move from the end of the first path to the beginning of the second path, thereby improving the laser cutting efficiency.

[0057] Here, a laser-off idle cutting path is included between the first path and the second path. This allows the laser emitted by the laser to quickly move to the starting position of the second path, improving the cutting efficiency of the laser beam on the strip 1. In addition, since the side connecting the first rounded corner 31 and the second rounded corner 32 in the electrode 3 has been cut during the previous cutting of the electrode 3, the idle cutting of the laser can also avoid cutting to this position again, thereby improving the forming quality of the electrode 3.

[0058] In some embodiments, the first path, second path, third path, and fifth path each include a first sub-path located in the coating area 11 and a second sub-path extending beyond the coating area 11. Specifically, the first sub-path is the movement path of the laser beam acting on the coating area 11 and cutting the coating area 11, and the second sub-path is the movement path of the laser beam not acting on the coating area 11 and not cutting the coating area 11. The aforementioned first path, second path, third path, and fifth path of the laser beam are fitted with the movement of the moving member 2 and the moving material strip 1 to obtain the final cutting path of the laser beam cutting the material strip 1. The first path, second path, third path, and fifth path are the paths of the laser beam cutting the rounded corners, which can ensure the forming quality of the rounded corners when the laser beam cuts the rounded corners and ensure that the waste material is completely cut off.

[0059] It should be noted that the first sub-path is Figure 2 The area shown by the solid line has a second sub-path. Figure 2 The area indicated by the dashed line.

[0060] Furthermore, both the first and second paths include second sub-paths at both ends and a first sub-path in the middle. This allows the laser to be turned on earlier and off later when cutting the first rounded corner 31 and the second rounded corner 32, thereby improving the forming quality of the first rounded corner 31 and the second rounded corner 32. The third path includes a second sub-path at the starting end and a first sub-path at the rear end, and the fifth path includes a first sub-path at the starting end and a second sub-path at the rear end. Since the fourth path between the third and fifth paths is a continuous cutting path for the coated area 11, this also improves the forming quality of the third rounded corner 33 and the fourth rounded corner 34.

[0061] In some embodiments, the movement trajectory 4 of the laser beam does not intersect. Specifically, the movement trajectory 4 of the laser beam is simple, with fewer scanning paths, which shortens processing time and improves efficiency. Moreover, in order to reduce dust contamination of the strip 1 during laser cutting, a dust removal device (not shown in the figure) is needed to adsorb the dust generated during the laser cutting process. Ensuring that the movement trajectory 4 of the laser beam does not intersect facilitates the setting of the dust removal device, thereby improving the dust removal effect.

[0062] In some embodiments, the conveyor belt 1 moves continuously under the drive of the moving member 2. When the laser beam completes its movement along the second path, the laser beam stops moving; when the laser beam reaches the processing area of ​​the third rounded corner 33, the laser beam moves along the third path. In this way, the number of times the galvanometer controls the movement of the laser beam can be reduced, the working time of the galvanometer can be reduced, and the service life of the galvanometer can be extended.

[0063] Furthermore, when the laser beam has completed its movement along the second path, it can continue to move. At this time, the direction of the laser beam's movement is opposite to the direction of the moving part 2 driving the material strip 1, which can further improve the cutting efficiency of the laser beam on the material strip 1.

[0064] In some embodiments, the feed strip 1 moves continuously under the drive of the moving member 2. When the laser beam completes its movement along the fifth path, the laser beam stops moving. When the laser beam reaches the processing area of ​​the first rounded corner 31 of the next electrode 3, the laser beam moves along the first path. In this way, the number of times the galvanometer controls the movement of the laser beam can be reduced, the working time of the galvanometer can be reduced, and the service life of the galvanometer can be extended.

[0065] Furthermore, when the laser beam has completed its movement along the fifth path, it can continue to move. At this time, the direction of the laser beam's movement is opposite to the direction of the moving part 2 driving the material strip 1, which can further improve the cutting efficiency of the laser beam on the material strip 1.

[0066] In some embodiments, the laser beam moves along the moving trajectory 4 and the moving member 2 drives the material strip 1 to move to form a cutting trajectory 5 for the material strip 1. The cutting trajectory 5 includes a first arc segment forming a first rounded corner 31, a second arc segment forming a second rounded corner 32, a third arc segment forming a third rounded corner 33, a first line segment cutting the electrode 3 from the material strip 1, and a fourth arc segment forming a fourth rounded corner 34. The first arc segment is from point A to point B, the second arc segment is from point C to point D, the third arc segment is from point D to point E, the first line segment is from point E to point F, and the fourth arc segment is from point F to point G.

[0067] Furthermore, the first, second, third, and fourth arc segments are all arc segments that protrude from the center of the electrode 3 outwards. By setting these arc segments to protrude from the center of the electrode 3 outwards, the electrode 3, after being assembled with the separator, has no sharp angles or right-angled corners when the processed electrode 3 is combined into a battery cell. This prevents the electrode 3 from puncturing the separator, thereby preventing the positive electrode 3 and the negative electrode 3 from coming into contact, further improving the safety of the battery when the electrode 3 is used.

[0068] In some embodiments, the processing cycle of the material strip 1 and the moving speed of the material strip 1 driven by the moving part 2 are calculated based on the size parameters of the material strip 1, and the moving trajectory 4 and scanning speed of the laser beam are obtained by fitting.

[0069] The moving part 2 drives the material belt 1 to move. When it reaches the designated cutting position, the laser is turned on and the rounded corners and sides of the electrode 3 are cut according to the moving trajectory 4 and scanning rate of the laser beam.

[0070] Specifically, based on the dimensional parameters of the strip 1 measured in the above embodiment, the processing cycle of the strip 1 is calculated, which is equivalent to calculating how many electrode sheets 3 the strip 1 will be cut into. Cutting one electrode sheet 3 corresponds to one processing cycle. The processing cycle of the strip 1, the moving speed of the strip 1 driven by the moving component 2, and the final cutting path of the laser beam on the strip 1 are fitted together to obtain the laser beam's movement trajectory 4 and scanning rate. After obtaining the above data, the moving component 2 drives the strip 1 to move to the cutting position, the laser is turned on, and the coating area 11 at the processing position is cut according to the laser beam's movement trajectory 4 and scanning rate to cut the rounded corners and sides of the electrode sheet 3, so as to process the strip 1 into an electrode sheet 3 with rounded corners.

[0071] In some embodiments, the moving member 2 drives the strip 1 to move along the length direction of the strip 1, and the moving member 2 drives the strip 1 to move at a constant speed. Specifically, when using a laser beam to cut the strip 1, it is generally necessary to cut one strip 1 into multiple electrode pieces 3. The cutting of the strip 1 is achieved by the moving member 2 driving the strip 1 to move and the galvanometer controlling the laser beam to move. Here, by the moving member 2 driving the strip 1 to move along the length direction of the strip 1, the laser beam can cut at various positions along the length direction of the strip 1, thereby conveniently processing the strip 1 into multiple electrode pieces 3.

[0072] Furthermore, when the moving part 2 drives the material strip 1 to move, the material strip 1 can move in other directions. For example, there is an angle between the moving direction of the material strip 1 driven by the moving part 2 and the length direction of the material strip 1, and the angle is an acute angle. In order to achieve the cutting method of the material strip 1 in the above embodiment, the galvanometer also needs to be adjusted to control the scanning trajectory of the laser beam.

[0073] In addition, the moving part 2 can also drive the material strip 1 to move in other ways, such as variable speed movement or intermittent movement. Furthermore, after the laser beam has finished cutting the second rounded corner 32 and the fourth rounded corner 34 of the material strip, the moving speed of the material strip 1 driven by the moving part 2 is increased, thereby further improving the cutting efficiency of the material strip 1.

[0074] It should be noted that the length direction of material strip 1 is... Figure 3 As shown by the middle arrow X1 or arrow X2.

[0075] A laser cutting apparatus is provided, applicable to any of the laser cutting methods described above. Since the laser cutting apparatus is applicable to the aforementioned laser cutting methods, the beneficial effects of the laser cutting apparatus on the laser cutting methods are as described above and will not be repeated here.

[0076] Specifically, the laser cutting device includes a moving part 2 and a laser. The moving part 2 is provided with an adsorption hole 21 for adsorbing the material strip 1 and moves the material strip 1. The laser emits a laser beam and can control the movement of the laser beam to cut the material strip 1 into electrode sheets 3. By providing the adsorption hole 21 on the moving part 2, it is possible to conveniently fix and disassemble the material strip 1 and the moving part 2, thereby improving the efficiency of processing the material strip 1 into electrode sheets 3.

[0077] In some embodiments, the moving part 2 includes a cutting groove 22 that coincides with the cutting trajectory 5. This configuration serves several purposes: first, it prevents the heat generated by the laser beam from burning the moving part 2 during laser beam cutting of the strip 1; second, it accelerates heat dissipation during laser beam cutting of the strip 1, preventing insufficient heat dissipation from affecting the cutting and forming quality of the electrode 3; and third, it allows for the timely removal of dust generated during laser beam cutting of the strip 1, thereby preventing dust contamination of the electrode 3 and improving the forming quality of the electrode 3.

[0078] Furthermore, in order to ensure the cutting quality of the laser beam, the width of the cutting groove 22 is greater than the width of the laser beam, so that when the laser beam cuts the strip 1, it can avoid cutting to the edge of the cutting groove 22.

[0079] In some embodiments, the moving member 2 includes a first adsorption area 23 for adsorbing the electrode 3 and a second adsorption area 24 for adsorbing the cut material 13. Specifically, the strip 1 is adsorbed onto the moving member 2 and moves under the drive of the moving member 2. In other words, the first adsorption area 23 is used to adsorb the strip 1 to form an electrode 3 with rounded corners, and the second adsorption area 24 is used to adsorb the cut material 13 cut from the strip 1. In this way, when the laser beam cuts the strip 1, it avoids shaking or flipping near the cutting position when cutting the rounded corners, avoids the situation where the rounded corners cannot be cut, and also avoids the problem of poor rounded corner forming quality, thereby improving the forming quality of the rounded corners.

[0080] It should be noted that the size of the first adsorption region 23 is approximately equal to the size of the electrode 3 with rounded corners, and the size of the second adsorption region 24 is approximately equal to the size of the cut-off material 13.

[0081] In some embodiments, the end of the first adsorption zone 23 away from the moving direction of the material belt 1 is a chamfered edge 25, which can adsorb the cut electrode sheet 3. Specifically, when the laser beam is used to cut the strip 1, the strip 1 moves continuously under the drive of the moving part 2. The laser beam moves sequentially along the first path, the second path, the third path, the fourth path, and the fifth path to cut off the electrode 3 with rounded corners. At this time, the chamfered edge 25 adsorbs the side of the cut electrode 3. Then, the laser beam cuts the next area of ​​the strip 1 along the next moving trajectory 4 to process the next electrode 3. The strip 1 is then cut along the first path, the second path, the third path, the fourth path, and the fifth path to form the next electrode 3. Since the chamfered edge 25 adsorbs the side of the previously cut electrode 3, enough space is left for the cutting of the next electrode 3. In this way, when the laser beam processes the first rounded corner 31 and the second rounded corner 32 of the next electrode 3 along the first path or the second path, it can avoid the laser beam cutting the side of the previous electrode 3, thereby improving the forming quality of the electrode 3.

[0082] In this embodiment, the first and second arc segments formed by the first and second paths of the laser beam on the material strip 1 at the ends of the first arc segments in the moving direction of the material strip 1 and the end of the upper electrode 3 after the edge chamfer 25 adsorbs the upper electrode 3 in the direction opposite to the moving direction of the material strip 1 do not coincide in the direction perpendicular to the plane where the material strip 1 is located. In this way, when using the laser beam to cut the lower electrode 3, the cutting of the upper electrode 3 can be avoided, thereby improving the forming quality when the material strip 1 is processed into the electrode 3.

[0083] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0084] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0085] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0086] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0087] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0088] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A laser cutting method, characterized in that, The process for cutting pre-formed tabs in a strip includes the following steps: The material strip is placed on the moving part, and the moving part attracts the material strip and drives the material strip to move; A moving laser beam is used to continuously cut and round the corners of the coated area of ​​the strip to form an electrode with rounded corners. When cutting the strip using a laser beam, the movement trajectory of the laser beam sequentially includes a first path for processing the first rounded corner, a second path for processing the second rounded corner, a third path for processing the third rounded corner, a fourth path for cutting the electrode sheet from the strip, and a fifth path for processing the fourth rounded corner; between the first path and the second path, there is a path where the laser is switched off and idles for skipping; the first path, the second path, the third path, and the fifth path all include a first sub-path located in the coating area and a second sub-path extending beyond the coating area; the first sub-path is the movement path where the laser beam acts on the coating area and cuts the coating area, and the second sub-path is the movement path where the laser beam does not act on the coating area and does not cut the coating area.

2. The laser cutting method according to claim 1, characterized in that, The movement trajectories of the laser beams do not intersect.

3. The laser cutting method according to claim 1, characterized in that, The material strip moves continuously under the drive of the moving component, and: When the laser beam has completed its movement along the second path, the laser beam stops moving; when the laser beam reaches the third rounded corner processing area, the laser beam moves along the third path. And / or, When the laser beam completes its movement along the fifth path, the laser beam stops moving; when the laser beam reaches the first rounded corner processing area of ​​the next electrode, the laser beam moves along the first path.

4. The laser cutting method according to claim 1, characterized in that, The laser beam moves along the moving trajectory, and the moving component drives the material strip to move, forming a cutting trajectory for the material strip. The cutting trajectory includes a first arc segment forming the first rounded corner, a second arc segment forming the second rounded corner, a third arc segment forming the third rounded corner, a first line segment cutting the electrode sheet from the material strip, and a fourth arc segment forming the fourth rounded corner; wherein: The first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are all arc segments that protrude from the middle of the electrode sheet to the outside of the electrode sheet.

5. The laser cutting method according to claim 1, characterized in that, The processing cycle of the material strip and the moving speed of the material strip driven by the moving part are calculated based on the size parameters of the material strip, and the moving trajectory and scanning speed of the laser beam are obtained by fitting. The moving component drives the material belt to move. When it reaches the designated cutting position, the laser is turned on, and the rounded corners and sides of the electrode are cut according to the moving trajectory and scanning rate of the laser beam.

6. The laser cutting method according to claim 1, characterized in that, The moving component drives the material belt to move along the length of the material belt, and the moving component drives the material belt to move at a constant speed.

7. A laser cutting device, characterized in that, The laser cutting method applicable to any one of claims 1-6 includes: The moving component is provided with adsorption holes for adsorbing the material strip and drives the material strip to move; A laser that emits a laser beam and can control the movement of the laser beam to cut the strip into electrodes.

8. The laser cutting apparatus according to claim 7, characterized in that, The moving part includes a cutting groove that coincides with the cutting trajectory.

9. The laser cutting apparatus according to claim 7, characterized in that, The movable component includes a first adsorption zone of the adsorption electrode and a second adsorption zone for adsorbing and cutting materials.

10. The laser cutting apparatus according to claim 9, characterized in that, The end of the first adsorption zone away from the direction of material strip movement is a chamfered edge, which can adsorb the cut electrode sheet.

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