Laser cutting method and device for pole piece segmentation

Abstract

The invention discloses a laser cutting method and device for pole piece segmentation, a pole piece comprises a foil and a coating layer coated on two sides of one end of the foil, the other end of the foil extends out of the coating layer, and the method comprises the following steps: controlling a laser to transversely cut the other end of the foil along a first preset track; the laser is controlled to vertically cut the other end of the foil along a second preset track; controlling the laser to transversely cut the other end of the foil along a third preset track; the laser is controlled to vertically cut the coating layer along a fourth preset track; wherein the first preset track, the second preset track, the third preset track and the fourth preset track do not form a closed-loop track. The first preset track, the second preset track, the third preset track and the fourth preset track do not form a closed-loop track, so that when the supporting structure is applied in a limited space, immediate bonding after high-temperature dust makes contact with a structural part is avoided, and therefore the supporting structure can be added, shaking of a material belt is reduced, and the cutting quality is improved; and the cutting efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting equipment, and in particular to a method and device for laser cutting of pole piece segments. Background Art

[0002] In the lithium battery manufacturing industry, the processing of the material strip is a key link in the production process of the tab, and its quality directly affects the performance and safety of the battery. The material strip consists of a coating area and a foil area. This unique design brings dual challenges in processing: the coating area, due to its thicker characteristics, shows good stability during the laser cutting process, reducing the processing error caused by material shaking, but it is also prone to generate a lot of dust due to the material characteristics; on the contrary, the foil area is thin and easy to shake, resulting in reduced processing stability, but the amount of dust generated is relatively small.

[0003] Traditionally, in order to ensure the continuity of the cutting trajectory and to ensure that the material strip moves in one direction at a constant speed during the cutting process, the laser movement trajectory is a complete figure eight. Figure 1 and Figure 2 As shown, when cutting 1-1 of the material strip, the trajectory to be cut is horizontal, but at this time the material strip is moving downward at a constant speed, so the actual trajectory of the laser is moving diagonally to the lower right, that is, the trajectory of the laser is 2-1, to offset the movement of the material strip; when cutting 1-2 of the material strip, the trajectory cut is in the vertical direction, that is, the trajectory of the laser is 2-2, which is consistent with or opposite to the direction of the material strip movement; when cutting 1-3 of the material strip, since the starting point is the end point of 1-2 and the material strip moves in one direction at a constant speed, the actual trajectory of the laser is moving diagonally to the lower left, that is, the trajectory of the laser is 2-3; when cutting 1-4 of the material strip, the trajectory of the laser is 2-4, which is similar to 1-2 and will not be repeated. Due to the above-mentioned trajectories, all laser trajectories on the market are currently in the shape of an eight or a triangle, because the laser itself has the characteristics of high density and high energy. When the trajectory forms a closed loop and is small in size, applying a support structure in a limited space will cause the high-temperature dust to immediately bond to the structural parts after contact. If no support structure is added, the material strip will vibrate too much, affecting the cutting quality, making it difficult to improve the cutting efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a laser cutting method and device for segmented pole pieces, aiming to solve the problems that traditional laser cutting easily causes high-temperature dust to adhere to structural parts if a supporting structure is added, and the cutting efficiency cannot be improved if the supporting structure is not added.

[0005] An embodiment of the present invention provides a method for laser cutting of a segmented pole piece, wherein the pole piece comprises a foil and a coating layer coated on both sides of one end of the foil, and the other end of the foil extends out of the coating layer, comprising:

[0006] Controlling the laser to transversely cut the other end of the foil along a first preset trajectory;

[0007] Controlling the laser to vertically cut the other end of the foil along a second preset trajectory;

[0008] Controlling the laser to transversely cut the other end of the foil along a third preset trajectory;

[0009] Controlling the laser to vertically cut the coating layer along a fourth preset trajectory;

[0010] Wherein, the first preset trajectory, the second preset trajectory, the third preset trajectory and the fourth preset trajectory do not form a closed-loop trajectory.

[0011] Furthermore, the first preset trajectory and the third preset trajectory are arranged obliquely relative to the pole piece, the first preset trajectory and the third preset trajectory are parallel or intersecting, the second preset trajectory and the fourth preset trajectory are arranged vertically, and the second preset trajectory and the fourth preset trajectory are parallel.

[0012] Furthermore, the bottom end of the second preset track, the two ends of the first preset track and the top end of the fourth preset track are connected in sequence, and the third preset track is parallel to the first preset track.

[0013] Furthermore, the bottom end of the second preset track, both ends of the first preset track and the bottom end of the fourth preset track are connected in sequence, and the third preset track is parallel to the first preset track.

[0014] Furthermore, the bottom end of the second preset track, both ends of the first preset track, both ends of the fourth preset track and the bottom end of the third preset track are connected in sequence, and the third preset track intersects with the first preset track.

[0015] Furthermore, the pole piece is cut along the first preset track, the second preset track, the third preset track and the fourth preset track respectively by using a plurality of lasers according to a predetermined setting.

[0016] An embodiment of the present invention also provides a laser cutting device for pole piece segments, which adopts the above-mentioned laser cutting method for pole piece segments, including: a supporting dust removal device, a first supporting member for supporting the foil material, and a lower waste belt, wherein the lower waste belt is arranged on the first supporting member on one side of the material belt moving direction, and the first supporting member is provided with a first unsupported cutting area and a dust suction chamber connected to the first cutting area, and the dust suction port of the supporting dust removal device is connected to the dust suction chamber.

[0017] Furthermore, the first preset track, the second preset track, the third preset track and the fourth preset track are located in the first cutting area.

[0018] Furthermore, it also includes: an air blowing device and an air blowing dust removal device, the first support member and the lower waste belt have a cutting space, the air blowing device and the air blowing dust removal device are respectively arranged on both sides of the cutting space, the first preset trajectory and the third preset trajectory are located in the first cutting area, and the second preset trajectory and the fourth preset trajectory are located in the cutting space.

[0019] Furthermore, it also includes: a second support member, on which a second cutting area and a third cutting area are arranged, and the second preset track and the fourth preset track are respectively located in the second cutting area and the third cutting area.

[0020] The present invention discloses a method and device for laser cutting of segmented pole pieces, wherein the pole piece comprises a foil and a coating layer coated on both sides of one end of the foil, and the other end of the foil extends out of the coating layer, and the method comprises: controlling a laser to cut the other end of the foil transversely along a first preset trajectory; controlling a laser to cut the other end of the foil vertically along a second preset trajectory; controlling a laser to cut the other end of the foil transversely along a third preset trajectory; controlling a laser to cut the coating layer vertically along a fourth preset trajectory; wherein the first preset trajectory, the second preset trajectory, the third preset trajectory, and the fourth preset trajectory do not form a closed-loop trajectory. The first preset trajectory, the second preset trajectory, the third preset trajectory, and the fourth preset trajectory of the present invention do not form a closed-loop trajectory, so that applying a support structure in a limited space will not cause high-temperature dust to immediately adhere to the structural member after contact, thereby increasing the support structure, reducing the jitter of the material strip, improving the cutting quality, and thus improving the cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0022] Figure 1 Trajectory diagram for laser cutting pole pieces;

[0023] Figure 2 It is a schematic diagram of a figure eight-shaped laser trajectory;

[0024] Figure 3 A schematic diagram of a process for laser cutting a segmented pole piece;

[0025] Figure 4It is a structural schematic diagram of the pole piece from the first perspective;

[0026] Figure 5 It is a structural schematic diagram of the pole piece from a second perspective;

[0027] Figure 6 It is a schematic diagram of the structure when the pole piece is cut;

[0028] Figure 7 It is a schematic diagram of the structure after the pole piece is cut;

[0029] Figure 8 This is a schematic diagram of the first trajectory of the segmented laser;

[0030] Fig. 9 A schematic diagram of the structure of a laser cutting device for segmenting a pole piece;

[0031] Fig.10 It is a schematic diagram of the second trajectory of the segmented laser;

[0032] Fig.11 Schematic diagram of the third trajectory of the segmented laser;

[0033] Fig.12 Schematic diagram of the fourth trajectory of the segmented laser;

[0034] Fig.13 A schematic structural diagram of a first-view laser cutting device for segmenting a pole piece of a first structure;

[0035] Fig.14 A schematic structural diagram of a second viewing angle of a laser cutting device for segmenting a pole piece of the first structure;

[0036] Fig.15 It is a structural schematic diagram of a first viewing angle when the first supporting member adopts a supporting roller;

[0037] Fig.16 It is a structural schematic diagram of a second viewing angle when the first supporting member adopts a supporting roller;

[0038] Fig.17 It is a structural schematic diagram when the first supporting member adopts a supporting plate;

[0039] Fig.18 A schematic diagram of the structure of a laser cutting device for segmenting a pole piece of the second structure;

[0040] Fig.19 It is a structural schematic diagram of a first-viewing angle of a laser cutting device for segmenting a pole piece of a third structure;

[0041] Fig. 20 It is a structural schematic diagram of a first-viewing angle of a laser cutting device for segmenting a pole piece of a fourth structure;

[0042] Fig.21 It is a structural schematic diagram of a laser cutting device for segmenting pole pieces of the third structure from a second viewing angle;

[0043] Fig. 22 is a schematic structural diagram of a second supporting member;

[0044] Fig.23 It is a structural schematic diagram of a fixed adsorption component;

[0045] Description of the markings in the figure:

[0046] 1. Foil; 2. Coating layer; 3. First preset track; 4. Second preset track; 5. Third preset track; 6. Fourth preset track; 7. Laser; 8. Material belt; 9. Support dust removal device; 10. First support member; 11. Lower scrap belt; 12. First cutting area; 13. Dust suction chamber; 14. Mounting block; 15. Air blowing device; 16. Air blowing dust removal device; 17. Cutting space; 18. Second support member; 19. Second cutting area; 20. Third cutting area; 21. Fixed adsorption component; 22. First negative pressure pipeline; 23. Fixed frame; 24. Second negative pressure pipeline; 25. Mechanism support member; 26. Fixed air blowing device; 27. Cutting window; 28. Upper adsorption port; 29. ​​Adsorption pipeline. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0049] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0050] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0051] See also Figure 3-8 This embodiment provides a method for laser cutting of a segmented pole piece, wherein the pole piece comprises a foil 1 and a coating layer 2 coated on both sides of one end of the foil 1, and the other end of the foil 1 extends out of the coating layer 2, comprising:

[0052] S101: controlling the laser to transversely cut the other end of the foil along a first preset track;

[0053] S102: controlling the laser to vertically cut the other end of the foil along a second preset trajectory;

[0054] S103: controlling the laser to transversely cut the other end of the foil along a third preset trajectory;

[0055] S104: controlling the laser to vertically cut the coating layer along a fourth preset track;

[0056] Among them, the first preset trajectory 3, the second preset trajectory 4, the third preset trajectory 5 and the fourth preset trajectory 6 do not form a closed-loop trajectory.

[0057] The first preset trajectory 3, the second preset trajectory 4, the third preset trajectory 5 and the fourth preset trajectory 6 of the present invention do not form a closed-loop trajectory, so that applying a support structure in a limited space will not cause high-temperature dust to adhere to the structural parts immediately after contact. This can increase the support structure, reduce the jitter of the material strip, improve the cutting quality, and thus improve the cutting efficiency.

[0058] In this embodiment, the first preset trajectory 3 and the third preset trajectory 5 are inclined relative to the pole piece, the first preset trajectory 3 and the third preset trajectory 5 are parallel or cross, the second preset trajectory 4 and the fourth preset trajectory 6 are vertically arranged, and the second preset trajectory 4 and the fourth preset trajectory 6 are parallel.

[0059] Specifically, when the first preset track 3 and / or the third preset track 5 moves obliquely to the lower left relative to the pole piece, the laser 7 (such as Fig. 9 As shown in the figure, the first preset track 3 and the third preset track 5 are cut from the other end of the foil 1 to the coating layer 2. When the first preset track 3 and / or the third preset track 5 are moving obliquely to the lower right relative to the pole piece, the laser 7 cuts from the coating layer 2 to the other end of the foil 1. Therefore, the first preset track 3 and the third preset track 5 can be parallel to the lower right relative to the pole piece; or, the first preset track 3 and the third preset track 5 can be parallel to the lower left relative to the pole piece; or, the first preset track 3 can be oblique to the lower right relative to the pole piece, and the third preset track 5 can be oblique to the lower left relative to the pole piece; or, the first preset track 3 can be oblique to the lower left relative to the pole piece, and the third preset track 5 can be oblique to the lower right relative to the pole piece. The second preset track 4 is located at the other end of the foil 1, and the fourth preset track 6 is located at the coating layer 2.

[0060] It should be noted that the intersection of the first preset track 3 and the third preset track 5 means that the first preset track 3 and the third preset track 5 may intersect at a certain point, or the first preset track 3 and the third preset track 5 extend in different directions but are not parallel.

[0061] In this embodiment, the first preset trajectory 3, the second preset trajectory 4, the third preset trajectory 5 and the fourth preset trajectory 6 only need not form a closed-loop trajectory. Therefore, the first preset trajectory 3, the second preset trajectory 4, the third preset trajectory 5 and the fourth preset trajectory 6 can be combined into any shape of trajectory according to actual circumstances.

[0062] Specifically, the first type: the first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are not connected together.

[0063] In some embodiments, see Figure 8 The first preset trajectory 3 and the third preset trajectory 5 are parallel and obliquely lower right relative to the pole piece, and the first preset trajectory 3 is located below the third preset trajectory 5, the second preset trajectory 4 and the fourth preset trajectory 6 are respectively located on both sides of the first preset trajectory 3, and the vertical height of the second preset trajectory 4 is higher than the vertical height of the fourth preset trajectory 6.

[0064] When it is necessary to adjust the material strip 8 (such as Fig. 9 When cutting (as shown in the figure), the laser 7 moves obliquely to the lower right along the first preset trajectory 3 to cut the other end of the foil 1, and then the laser 7 moves downward and vertically cuts the other end of the foil 1 along the second preset trajectory 4; then the laser 7 moves to the starting point of the third preset trajectory 5 and moves obliquely to the lower right along the third preset trajectory 5 to cut the other end of the foil 1, and then the laser 7 moves to the starting point of the fourth preset trajectory 6 and vertically cuts the coating layer 2 along the fourth preset trajectory 6.

[0065] The second type: two of the first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are connected, and the other two are not connected to any track.

[0066] Under this layout, the cutting process will be carried out according to the specific configuration of the connected track and the independent track. This combination not only ensures the continuity and efficiency of the cutting process, but also provides sufficient flexibility to meet different process requirements.

[0067] In some embodiments, the first preset trajectory 3 and the third preset trajectory 5 are parallel and obliquely lower right relative to the pole piece, and the first preset trajectory 3 is located below the third preset trajectory 5, the second preset trajectory 4 and the fourth preset trajectory 6 are respectively located on both sides of the first preset trajectory 3, the bottom end of the first preset trajectory 3 is connected to the bottom end of the second preset trajectory 4, and the fourth preset trajectory 6 is located below the first preset trajectory 3.

[0068] When the material strip 8 needs to be cut, the laser 7 moves obliquely to the lower right along the first preset trajectory 3 to cut the other end of the foil 1, and then the laser 7 cuts the other end of the foil 1 vertically along the second preset trajectory 4; then the laser 7 moves to the starting point of the third preset trajectory 5 and moves obliquely to the lower right along the third preset trajectory 5 to cut the other end of the foil 1, and then the laser 7 moves to the starting point of the fourth preset trajectory 6 and cuts the coating layer 2 vertically along the fourth preset trajectory 6.

[0069] The continuity of the cutting process of the first preset track 3 and the second preset track 4 is ensured, and the cutting efficiency is improved.

[0070] The third type: three of the first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are connected, and the other one is not connected to any track.

[0071] In some embodiments, see Fig.10 The bottom end of the second preset track 4, the two ends of the first preset track 3 and the top end of the fourth preset track 6 are connected in sequence, and the third preset track 5 is parallel to the first preset track 3.

[0072] Specifically, the first preset track 3 and the third preset track 5 are parallel and obliquely lower right relative to the pole piece, and the first preset track 3 is located below the third preset track 5, the second preset track 4 and the fourth preset track 6 are respectively located on both sides of the first preset track 3, and the bottom end of the second preset track 4, the two ends of the first preset track 3 and the top end of the fourth preset track 6 are connected in sequence.

[0073] When the material strip 8 needs to be cut, the laser 7 moves obliquely to the lower right along the first preset track 3 to cut the other end of the foil 1, and then the laser 7 vertically cuts the other end of the foil 1 along the second preset track 4; then the laser 7 moves to the starting point of the third preset track 5 and moves obliquely to the lower right along the third preset track 5 to cut the other end of the foil 1, and then the laser 7 moves to the starting point of the fourth preset track 6 (i.e., the top or bottom of the fourth preset track 6) and vertically cuts the coating layer 2 along the fourth preset track 6. The starting point of the first preset track 3 can be the starting point of the fourth preset track 6, or the end point of the fourth preset track 6.

[0074] The continuity of the cutting process of the first preset track 3 and the second preset track 4 is ensured, and the cutting efficiency is improved.

[0075] In some embodiments, see Fig.11 The bottom end of the second preset track 4 , the two ends of the first preset track 3 , and the bottom end of the fourth preset track 6 are connected in sequence, and the third preset track 5 is parallel to the first preset track 3 .

[0076] Specifically, the first preset track 3 and the third preset track 5 are parallel and obliquely lower right relative to the pole piece, and the first preset track 3 is located below the third preset track 5, the second preset track 4 and the fourth preset track 6 are respectively located on both sides of the first preset track 3, and the bottom end of the second preset track 4, the two ends of the first preset track 3 and the bottom end of the fourth preset track 6 are connected in sequence.

[0077] When the material strip 8 needs to be cut, the laser 7 moves obliquely to the lower right along the first preset track 3 to cut the other end of the foil 1, and then the laser 7 vertically cuts the other end of the foil 1 along the second preset track 4; then the laser 7 moves to the starting point of the third preset track 5 and moves obliquely to the lower right along the third preset track 5 to cut the other end of the foil 1, and then the laser 7 moves to the starting point of the fourth preset track 6 (i.e., the top or bottom of the fourth preset track 6) and vertically cuts the coating layer 2 along the fourth preset track 6. The starting point of the first preset track 3 can be the starting point of the fourth preset track 6, or the end point of the fourth preset track 6.

[0078] The continuity of the cutting process of the first preset track 3 and the second preset track 4 is ensured, and the cutting efficiency is improved.

[0079] The fourth type: the first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are connected to each other to form a track on the coordinates, but the operation of the laser 7 does not need to follow the formed track.

[0080] In some embodiments, see Fig.12 , the bottom end of the second preset track 4, the two ends of the first preset track 3, the two ends of the fourth preset track 6 and the bottom end of the third preset track 5 are connected in sequence, and the third preset track 5 and the first preset track 3 intersect.

[0081] Specifically, the first preset trajectory 3 is inclined to the lower right relative to the pole piece, the third preset trajectory 5 is inclined to the lower left relative to the pole piece, the second preset trajectory 4 and the fourth preset trajectory 6 are respectively located on both sides of the first preset trajectory 3, and the bottom end of the second preset trajectory 4, the two ends of the first preset trajectory 3, the two ends of the fourth preset trajectory 6 and the bottom end of the third preset trajectory 5 are connected in sequence.

[0082] When the material strip 8 needs to be cut, the laser 7 moves obliquely to the lower right along the first preset trajectory 3 to cut the other end of the foil 1, and then the laser 7 vertically cuts the other end of the foil 1 along the second preset trajectory 4; then the laser 7 moves to the starting point of the third preset trajectory 5 and moves obliquely to the lower left along the third preset trajectory 5 to cut the other end of the foil 1, and then the laser 7 vertically cuts the coating layer 2 along the fourth preset trajectory 6, and finally completes the cutting at the top of the first preset trajectory 3.

[0083] The continuity of the cutting process of the first preset track 3 and the second preset track 4, and the third preset track 5 and the fourth preset track 6 is ensured, thereby improving the cutting efficiency.

[0084] In this embodiment, since a single laser beam cannot meet the high-speed beat requirement after the laser is segmented, multiple lasers 7 can be used to cut the pole piece along the first preset trajectory 3, the second preset trajectory 4, the third preset trajectory 5 and the fourth preset trajectory 6 according to predetermined settings.

[0085] Specifically, two lasers 7 , three lasers 7 , or four lasers 7 may be used to cut the material strip 8 along the first preset track 3 , the second preset track 4 , the third preset track 5 , and the fourth preset track 6 .

[0086] The simultaneous operation of multiple lasers 7 can significantly reduce cutting time. Each laser 7 independently cuts along its designated track without waiting for other tracks to complete, which greatly speeds up the overall production process. Each laser 7 can be precisely controlled and calibrated for the track it is responsible for, ensuring the accuracy and consistency of the cutting. This reduces the problem of decreased accuracy that may be caused by a single laser 7 working for a long time. The multi-laser 7 system can balance the load according to actual production needs to avoid overloading a single laser 7. This helps to extend the service life of the laser 7 and reduce maintenance costs caused by overuse.

[0087] For example, when two lasers 7 are provided, one of the lasers 7 can be set to cut the material strip 8 along the first preset track 3 and the second preset track 4, and the other laser 7 can be set to cut the material strip 8 along the third preset track 5 and the fourth preset track 6. Alternatively, one of the lasers 7 can be set to cut the material strip 8 along the first preset track 3 and the third preset track 5, and the other laser 7 can be set to cut the material strip 8 along the second preset track 4 and the fourth preset track 6. It is also possible to set one of the lasers 7 to cut the material strip 8 along the first preset track 3, the second preset track 4 and the third preset track 5, and set the other laser 7 to cut the material strip 8 along the fourth preset track 6. The above is only an example of this embodiment, and the specific setting depends on the actual situation, and this embodiment will not be described in detail.

[0088] For example, when three lasers 7 are provided, the first laser can be set to cut the material strip 8 along the first preset track 3 and the second preset track 4, the second laser can be set to cut the material strip 8 along the third preset track 5, and the third laser can be set to cut the material strip 8 along the fourth preset track 6. Alternatively, the first laser can be set to cut the material strip 8 along the second preset track 4, the second laser can be set to cut the material strip 8 along the first preset track 3, and the third laser can be set to cut the material strip 8 along the third preset track 5 and the fourth preset track 6. The above is only an example of this embodiment, and the specific setting depends on the actual situation, and this embodiment will not be repeated in detail.

[0089] For example, when four lasers 7 are provided, the first laser can be set to cut the material strip 8 along the first preset track 3, the second laser can be set to cut the material strip 8 along the second preset track 4, the third laser can be set to cut the material strip 8 along the third preset track 5, and the fourth laser can be set to cut the material strip 8 along the fourth preset track 6. Alternatively, the first laser can be set to cut the material strip 8 along the second preset track 4, the second laser can be set to cut the material strip 8 along the third preset track 5, the third laser can be set to cut the material strip 8 along the fourth preset track 6, and the fourth laser can be set to cut the material strip 8 along the first preset track 3. The above is only an example of this embodiment, and the specific setting depends on the actual situation, and this embodiment will not be described in detail.

[0090] See also Figure 13-16 The present embodiment also provides a laser cutting device for electrode segmentation, which adopts the laser cutting method for electrode segmentation of the above embodiment, including: a supporting dust removal device 9, a first supporting member 10 for supporting the foil 1 and a lower waste belt 11, the lower waste belt 11 is arranged on the first supporting member 10 on one side of the moving direction of the material belt 8, the first supporting member 10 is provided with an unsupported first cutting area 12 and a dust suction chamber 13 connected to the first cutting area 12, and the dust suction port of the supporting dust removal device 9 is connected to the dust suction chamber 13.

[0091] Since the foil area cut by the first preset trajectory 3 and the third preset trajectory 5 is extremely thin, the laser jitters a lot when the material strip 8 moves, which can easily affect the cutting quality. Moreover, the faster the tape speed, the greater the jitter, and the lower the dimensional accuracy of the cutting, which may even cause the tabs to fold and tear the material strip 8. For this reason, the present embodiment adopts a first support member 10 to support the material strip 8. The first support member 10 can evenly distribute support rollers of different lengths on the left and right sides of the first preset trajectory 3 and the third preset trajectory 5. The support rollers can rotate with the material strip 8, thereby reducing the jitter of the material strip 8. Secondly, by adding a support dust removal device 9, the support dust removal device 9 can stably adsorb the material strip 8 on the support roller, thereby minimizing the jitter of the material strip 8. In addition, the support dust removal device 9 can timely remove the dust generated during the cutting process to avoid dust accumulation.

[0092] The support roller on the front side of the first cutting area 12 can be placed on the back side, or a support plate can be used instead of the support roller (such as Fig.17 As shown), a suspended structure can also be used.

[0093] In this embodiment, when the first support member 10 adopts the structural design of a support roller, a mounting block 14 (such as Fig.15 to install the support rollers.

[0094] In this embodiment, the first preset trajectory 3, the second preset trajectory 4, the third preset trajectory 5 and the fourth preset trajectory 6 are located in the first cutting area 12; or, the first preset trajectory 3 and the third preset trajectory 5 are located in the first cutting area 12, and the second preset trajectory 4 and the fourth preset trajectory 6 are located outside the first cutting area 12.

[0095] Among them, when the laser working area is small or the material dust problem is not prominent, some combined laser tracks can be considered to complete all cutting in the first cutting area 12. That is, the first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are located in the first cutting area 12.

[0096] Specifically, in some embodiments, please refer to Fig.10 and Fig.13 , the first preset track 3 and the third preset track 5 are parallel to the lower right relative to the pole piece, and the first preset track 3 is located below the third preset track 5, the second preset track 4 and the fourth preset track 6 are located on both sides of the first preset track 3, respectively, and the bottom end of the second preset track 4, the two ends of the first preset track 3 and the top end of the fourth preset track 6 are connected in sequence. The first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are located in the first cutting area 12.

[0097] In some embodiments, see Fig.11 and Fig.18 , the first preset track 3 and the third preset track 5 are parallel to the lower right relative to the pole piece, and the first preset track 3 is located below the third preset track 5, the second preset track 4 and the fourth preset track 6 are located on both sides of the first preset track 3, respectively, and the bottom end of the second preset track 4, the two ends of the first preset track 3 and the bottom end of the fourth preset track 6 are connected in sequence. The first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are located in the first cutting area 12.

[0098] In some embodiments, see Fig.12 and Fig.19, the first preset track 3 is inclined to the lower right relative to the pole piece, the third preset track 5 is inclined to the lower left relative to the pole piece, the second preset track 4 and the fourth preset track 6 are respectively located on both sides of the first preset track 3, the bottom end of the second preset track 4, the two ends of the first preset track 3, the two ends of the fourth preset track 6 and the bottom end of the third preset track 5 are sequentially connected and combined into a trapezoidal track diagram, which can reduce the space of the cutting area. The first preset track 3, the second preset track 4, the third preset track 5 and the fourth preset track 6 are located in the first cutting area 12.

[0099] In this embodiment, when the first preset track 3 and the third preset track 5 are located in the first cutting area 12, and the second preset track 4 and the fourth preset track 6 are located outside the first cutting area 12, please refer to Fig. 20 and 21 , also includes: an air blowing device 15 and an air blowing dust removal device 16, the first support member 10 and the lower waste belt 11 have a cutting space 17, the air blowing device 15 and the air blowing dust removal device 16 are respectively arranged on both sides of the cutting space 17, the first preset trajectory 3 and the third preset trajectory 5 are located in the first cutting area 12, and the second preset trajectory 4 and the fourth preset trajectory 6 are located in the cutting space 17.

[0100] Since the thickness of the coating area is much greater than that of the foil area, for example, for conventional negative electrode sheets, the thickness of the coating area (i.e., the coating layer 2) is 130μm to 150μm, and the thickness of the foil area is 4.5μm to 6μm. It can be seen that the stability of the coating area is greater than that of the foil area, and the amount of dust generated by cutting the coating area is also greater than that of the foil area. Therefore, no supporting device is added around the cutting area of ​​the second preset trajectory 4 and the fourth preset trajectory 6, and only an air blowing device 15 and an air blowing dust removal device 16 are added on the side. The air blowing device 15 can generate a negative pressure with an extremely fast flow rate to cool and blow away the dust generated in the coating area of ​​the cutting electrode sheet. In conjunction with the air blowing dust removal device 16, the dust generated in the coating area can be quickly taken away.

[0101] In this embodiment, a support device may also be added around the cutting area of ​​the second preset track 4 and the fourth preset track 6. Fig. 22 , and also includes: a second support member 18, on which a second cutting area 19 and a third cutting area 20 are arranged, and the second preset track 4 and the fourth preset track 6 are respectively located in the second cutting area 19 and the third cutting area 20.

[0102] The second support member 18 can further reduce the vibration of the material strip 8, thereby improving the cutting quality and efficiency of the pole piece. It is just necessary to speed up the cycle of cleaning the residual dust.

[0103] The second support member 18 may adopt a support roller structure design or a support plate structure design.

[0104] In this embodiment, it also includes: a fixed adsorption component 21 (such as Fig. 9 As shown), the first support member 10 is installed in a fixed adsorption assembly 21. The fixed adsorption assembly 21 can provide negative pressure to adsorb the material belt 8 and dust. The fixed adsorption assembly 21 can also fix the support base.

[0105] For details, please refer to Fig.23 The fixed adsorption component 21 includes: a first negative pressure pipeline 22, a fixed frame 23, a second negative pressure pipeline 24, a mechanism support 25, a fixed air blowing device 26, a cutting window 27 and an upper adsorption port 28. The first negative pressure pipeline 22, the second negative pressure pipeline 24 and the mechanism support 25 are all connected to the outer wall of the fixed frame 23. The fixed air blowing device 26, the cutting window 27 and the upper adsorption port 28 are all arranged on the fixed frame 23. The first negative pressure pipeline 22 is connected to the upper adsorption port 28, and the second negative pressure pipeline 24 is connected to the fixed air blowing device 26. When the material strip 8 passes through the component, the first negative pressure pipeline 22 is a negative pressure airflow, which passes through the fixed frame 23 and the upper adsorption port 28 and adsorbs the material strip 8 through the mesh of the upper adsorption port 28. The second negative pressure pipeline 24 is also a negative pressure airflow, which generates negative pressure from the side to capture the dust generated during the cutting process, and cooperates with the air blowing device 15 and the fixed air blowing device 26 to cool and control the dust. When the material strip 8 moves to the cutting window 27, the negative pressure airflow in the second negative pressure duct 24 passes through the dust suction chamber 13 and the first cutting area 12, and adsorbs the material strip 8 to the surface of the first support member 10, thereby eliminating the shaking of the material strip 8 during the cutting process.

[0106] It should be noted that Fig.15 and Fig.23 The arrows in the figure indicate the direction of gas flow.

[0107] In this embodiment, it also includes: a laser 7 (such as Fig. 9 As shown), the laser 7 is set corresponding to the material strip 8 to cut the material strip 8.

[0108] In this embodiment, it also includes: an adsorption pipeline 29 (such as Fig.18 As shown in FIG. 1 , the adsorption pipe 29 is connected to the lower scrap belt 11. The adsorption pipe 29 can adsorb the pole piece and the scrap belt 8 after the cutting is completed, and can also adsorb the escaping dust.

[0109] It should be noted that the galvanometer in this embodiment can be determined as a conventional galvanometer or a composite galvanometer according to needs.

[0110] In this embodiment, the cutting workspaces of the coating area and the foil area are separated. Since the coating area generates a lot of dust and has a high strength when cutting, a suspended method is used without any support on all sides to give the dust enough cooling time. In addition, by providing a dust suction chamber 13 connected to the first cutting area 12, and a dust suction port of the dust removal device 9 connected to the dust suction chamber 13, the dust removal device 9 can quickly take away the dust and solve the problem of powder accumulation. Due to the support of the dust removal device 9 and the first support 10, the problems of increased jitter of the material strip 8 and increased dust per unit time caused by the increase in cutting speed can be well solved, thereby releasing the capacity of the laser 7 and improving the efficiency of pole piece forming. In addition, unlike the traditional pole ear cutting without support, the higher the pole ear, the greater the jitter and the more difficult it is to cut. Since the device of this embodiment is supported throughout the process of cutting the pole ear, the height of the pole ear will not have a significant impact on the cutting effect, so it has a good improvement effect on high pole ears.

[0111] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0112] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0113] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A method for laser cutting of a segmented pole piece, wherein the pole piece comprises a foil and a coating layer coated on both sides of one end of the foil, and the other end of the foil protrudes from the coating layer, characterized in that: include: Controlling the laser to transversely cut the other end of the foil along a first preset trajectory; Controlling the laser to vertically cut the other end of the foil along a second preset trajectory; Controlling the laser to transversely cut the other end of the foil along a third preset trajectory; Controlling the laser to vertically cut the coating layer along a fourth preset trajectory; Wherein, the first preset trajectory, the second preset trajectory, the third preset trajectory and the fourth preset trajectory do not form a closed-loop trajectory.

2. The laser cutting method for pole piece segmentation according to claim 1, characterized in that: The first preset trajectory and the third preset trajectory are arranged obliquely relative to the pole piece, the first preset trajectory and the third preset trajectory are parallel or intersecting, the second preset trajectory and the fourth preset trajectory are arranged vertically, and the second preset trajectory and the fourth preset trajectory are parallel.

3. The laser cutting method for pole piece segmentation according to claim 2, characterized in that: The bottom end of the second preset track, the two ends of the first preset track and the top end of the fourth preset track are connected in sequence, and the third preset track is parallel to the first preset track.

4. The laser cutting method for pole piece segmentation according to claim 2, characterized in that: The bottom end of the second preset track, both ends of the first preset track and the bottom end of the fourth preset track are connected in sequence, and the third preset track is parallel to the first preset track.

5. The laser cutting method for pole piece segmentation according to claim 2, characterized in that: The bottom end of the second preset track, both ends of the first preset track, both ends of the fourth preset track and the bottom end of the third preset track are connected in sequence, and the third preset track intersects with the first preset track.

6. The laser cutting method for pole piece segmentation according to claim 1, characterized in that: The pole piece is cut along the first preset track, the second preset track, the third preset track and the fourth preset track respectively by using a plurality of lasers according to a predetermined setting.

7. A laser cutting device for a pole piece segment, wherein the laser cutting device for a pole piece segment adopts the laser cutting method for a pole piece segment according to any one of claims 1 to 6, characterized in that: include: A support dust removal device, a first support member for supporting the foil material and a lower waste belt, wherein the lower waste belt is arranged on the first support member on one side of the material belt moving direction, the first support member is provided with an unsupported first cutting area and a dust suction chamber connected to the first cutting area, and the dust suction port of the support dust removal device is connected to the dust suction chamber.

8. The laser cutting device for pole piece segmentation according to claim 7, characterized in that: The first preset track, the second preset track, the third preset track and the fourth preset track are located within the first cutting area.

9. The laser cutting device for pole piece segmentation according to claim 7, characterized in that: Also includes: An air blowing device and an air blowing dust removal device, the first support member and the lower waste belt have a cutting space, the air blowing device and the air blowing dust removal device are respectively arranged on both sides of the cutting space, the first preset trajectory and the third preset trajectory are located in the first cutting area, and the second preset trajectory and the fourth preset trajectory are located in the cutting space.

10. The laser cutting device for pole piece segmentation according to claim 7, characterized in that: Also includes: A second supporting member is provided with a second cutting area and a third cutting area, and the second preset track and the fourth preset track are respectively located in the second cutting area and the third cutting area.

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