Tab Cutting Device and Tab Cutting Method

Abstract

The present invention provides an ear cutting device and an ear cutting method. Among them, the ear cutting device includes: a conveying structure adapted to convey a pole piece strip; a laser disposed on the side of the conveying structure and adapted to emit laser light toward the conveying surface of the conveying structure; a reflecting structure adapted to move the laser light emitted by the laser on the rolling surface of the conveying structure. When the pole piece strip conveys on the conveying structure and ear cutting is performed, the laser emits laser light, and after being reflected by the reflecting structure, the laser light irradiates on the rolling surface of the conveying structure. The light spot of the laser cuts the foil to be cut and forms ears. In the above structure, the conveyance of the pole piece strip and ear cutting are carried out simultaneously, simplifying the processing technology. At the same time, the distance from the laser after reflection to the foil to be cut is relatively close, and the processing accuracy is high. Therefore, the technical solution of the present invention solves the defects of low efficiency and low accuracy in the existing laser cutting of ears.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing technology, and particularly relates to an ear cutting device and an ear cutting method. Background Art

[0002] Ear cutting is an important process in battery processing. In ear cutting, the empty foil area on the pole piece strip is cut to form ears. Laser cutting has been relatively maturely applied in ear forming, but there are still problems in the existing ear laser cutting, such as complex process, low processing efficiency and accuracy. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low efficiency and accuracy of the existing ear laser cutting, and thus provide an ear cutting device and an ear cutting method.

[0004] To solve the above problems, the present invention provides an ear cutting device, including: a conveying structure adapted to convey a pole piece strip; a laser device arranged on the side of the conveying structure and adapted to emit laser light to the conveying surface of the conveying structure; a reflecting structure adapted to make the laser light emitted by the laser device move on the rolling surface of the conveying structure.

[0005] Optionally, the conveying structure is a conveying roller, and the conveying structure is of a hollow structure. A light inlet is arranged at the first end of the conveying structure, a light outlet is arranged on the rolling surface of the conveying structure, and both the light inlet and the light outlet are communicated with the inside of the conveying structure. The laser device is arranged on the axial side of the conveying structure and adapted to emit laser light to the light inlet, and the reflecting structure is swingably arranged inside the conveying structure and adapted to reflect the laser light emitted by the laser device to the light outlet.

[0006] Optionally, there are multiple light outlets, and the multiple light outlets are arranged at intervals along the circumferential direction of the conveying structure.

[0007] Optionally, the reflecting structure is a reflecting mirror, and the reflecting mirror swings independently relative to the conveying structure and is adapted to make the laser light emitted by the laser device swing within the range of the light outlet.

[0008] Optionally, multiple adsorption holes are arranged on the rolling surface of the conveying structure, and an adsorption port is arranged at the second end of the conveying structure. The multiple adsorption holes and the multiple adsorption ports are both communicated with the inside of the conveying structure.

[0009] Optionally, the laser device is arranged outside the rolling surface of the conveying structure, and the reflecting structure is the galvanometer of the laser device.

[0010] Optionally, the ear cutting device further includes a waste collection structure, and the waste collection structure is arranged below the conveying structure.

[0011] Optionally, the tab cutting device further includes a CCD detection structure, which is arranged outside the conveying structure.

[0012] Optionally, a cutting groove is provided on the outer surface of the conveying structure, the to-be-cut foil of the tab strip is located in the cutting groove, and the light outlet is located on the bottom wall of the cutting groove.

[0013] The present invention also provides a tab cutting method, which uses the above tab cutting device to cut the tab strip. The tab cutting method includes: Step S1: The conveying structure conveys the tab strip; Step S2: The laser emits laser light, and the reflection structure makes the laser light move on the conveying surface of the conveying structure, so as to cut the tabs while the tab strip is conveyed.

[0014] Optionally, Step S2 includes: Step S21: The laser forms a first cutting segment on the to-be-cut foil; Step S22: The light spot of the laser moves forward a preset distance relative to the tab strip along the conveying direction of the tab strip; Step S23: The laser forms a second cutting segment on the to-be-cut foil; Step S24: Cut in the way of Step S21, Step S22, Step S23, Step S22 and Step S21 reciprocally, so as to alternately form the first cutting segment and the second cutting segment on the to-be-cut foil.

[0015] Optionally, the first cutting segment and the second cutting segment overlap in the width direction of the tab strip.

[0016] Optionally, both the first cutting segment and the second cutting segment are U-shaped structures. Among them, the opening directions of the first cutting segment and the second cutting segment are opposite, and the starting point of the second cutting segment is located on the bottom edge of the first cutting segment, and the starting point of the first cutting segment is located on the bottom edge of the second cutting segment.

[0017] Optionally, both the first cutting segment and the second cutting segment include a toothed portion, and upper extension segments and lower extension segments connected to both ends of the toothed portion. At the connection of adjacent first cutting segments and second cutting segments, the upper extension segments and the lower extension segments are arranged in parallel, and both the upper extension segments and the lower extension segments are connected to the outer edge of the tooth top of the toothed portion.

[0018] Optionally, there are multiple light outlets, and the multiple light outlets are arranged at intervals along the circumferential direction of the conveying structure. In Step S2, the first cutting segment and the second cutting segment are respectively cut at adjacent light outlets.

[0019] The present invention has the following advantages:

[0020] With the technical solution of the present invention, the pole piece strip rotates on the conveying structure. When the pole ear is cut, the laser emits laser light, and the laser light is reflected by the reflection structure and then irradiates on the rolling surface of the conveying structure. The laser spot cuts the foil to be cut and forms a pole ear. In the above structure, the conveyance of the pole piece strip and the cutting of the pole ear are carried out simultaneously, which simplifies the processing process. At the same time, the laser is relatively close to the foil to be cut after reflection, and the processing accuracy is high. The advantage of adopting the reflection structure is that it includes a single laser and can achieve front and back cutting of two paths without its own jumping, and the cost is low. Therefore, the technical solution of the present invention solves the defect of low efficiency and accuracy in the existing laser cutting of pole ears. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 FIG. 1 shows a schematic structural diagram of Embodiment 1 of the pole ear cutting device of the present invention;

[0023] Figure 2 shows Figure 1 a schematic structural diagram of the conveying structure of the pole ear cutting device in FIG.

[0024] Figure 3 shows Figure 1 a side view schematic diagram of the pole ear cutting device in FIG.

[0025] Figure 4 FIG. 2 shows a schematic structural diagram of Embodiment 2 of the pole ear cutting device of the present invention;

[0026] Figure 5 FIG. 3 shows a schematic diagram of a cutting path when the pole ear cutting method of the present invention cuts the pole ear;

[0027] Figure 6 shows Figure 5 an enlarged schematic diagram at position A in FIG.

[0028] Figure 7 FIG. 4 shows another schematic diagram of a cutting path when the pole ear cutting method of the present invention cuts the pole ear; and

[0029] Figure 8 shows Figure 7 an enlarged schematic diagram at position B in FIG.

[0030] Description of the reference numerals:

[0031] 10. Conveyor structure; 11. Light inlet; 12. Light outlet; 13. Adsorption hole; 14. Adsorption port; 15. Cutting groove; 20. Laser; 30. Reflection structure; 40. Waste collection structure; 50. CCD detection structure; 100. Pole piece strip; 101. Foil to be cut; 200. First cutting section; 300. Second cutting section; 401. Tooth-shaped part; 402. Upper extension section; 403. Lower extension section. Detailed implementation mode

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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 communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Embodiment 1

[0037] [[ID=XX]]As Figures 1 to 3 shown, the tab cutting device of Embodiment 1 includes a conveyor structure 10, a laser 20, and a reflection structure 30. Among them, the conveyor structure 10 is adapted to transfer the pole piece strip 100. The laser 20 is disposed on the side of the conveyor structure 10 and is adapted to emit laser light to the conveying surface of the conveyor structure 10. The reflection structure 30 is adapted to make the laser light emitted by the laser 20 move on the rolling surface of the conveyor structure 10.

[0038] Using the technical solution of this embodiment, the pole piece strip 100 flows on the conveying structure 10. When the tab is cut, the laser device 20 emits laser light, and the laser light is reflected by the reflection structure 30 and then irradiated on the rolling surface of the conveying structure 10. The laser spot cuts the to-be-cut foil 101 and forms a tab. In the above structure, the conveying of the pole piece strip 100 and the tab cutting are carried out simultaneously, which simplifies the processing technology. At the same time, the distance between the laser light after reflection and the to-be-cut foil 101 is relatively close, and the processing accuracy is high. Therefore, the technical solution of this embodiment solves the defects of low efficiency and low accuracy in the prior art for laser cutting of tabs.

[0039] Furthermore, in this example, the conveying structure 10 is a conveying roller, and the conveying structure 10 has a hollow structure. A light inlet 11 is provided at the first end of the conveying structure 10, and a light outlet 12 is provided on the rolling surface of the conveying structure 10. Both the light inlet 11 and the light outlet 12 are communicated with the inside of the conveying structure 10. The laser device 20 is arranged on the side part of the axial direction of the conveying structure 10 and is adapted to emit laser light to the light inlet 11. The reflection structure 30 is swingably arranged inside the conveying structure 10 and is adapted to reflect the laser light emitted by the laser device 20 to the light outlet 12.

[0040] In this embodiment, the pole piece strip 100 flows on the conveying structure 10, and the light outlet 12 corresponds to the to-be-cut foil 101 of the pole piece strip 100. When the tab is cut, the laser device 20 emits laser light from the side part of the conveying structure 10, and the laser light enters from the light inlet 11 and is reflected by the reflection structure 30 inside the conveying structure 10. After being reflected, the laser light exits from the light outlet 12 to cut the to-be-cut foil and form a tab. In the above structure, the reflection structure 30 is arranged inside the conveying structure 10, with a large adjustment range, and the distance between the laser light after reflection and the to-be-cut foil is relatively close, and the processing accuracy is high.

[0041] From Figure 2 It can be seen that the conveying structure 10 has a cylindrical structure. When the conveying structure 10 rotates, it can drive the pole piece strip 100 to flow. The inside of the conveying structure 10 is a hollow structure, and a light inlet 11 is formed at its end, and the light inlet 11 is coaxially arranged with the central axis of the conveying structure 10. The light outlet 12 is arranged on the rolling surface of the conveying structure 10, that is, on the outer peripheral surface of the conveying structure 10. The light outlet 12 in this embodiment has a square structure. The reflection structure 30 is arranged inside the conveying structure 10, combined with Figure 1 It can be seen that the reflection structure 30 is arranged on the central axis of the conveying structure 10, and the reflection structure 30 and the light outlet 12 are in the same radial position.

[0042] Combined with Figure 3It can be seen that the laser 20 is arranged on the axial outer side of the conveying structure 10, and the laser incident position coincides with the axis position of the conveying structure 10. The laser enters the conveying structure 10 from the light inlet 11, is reflected by the reflection structure 30 and then exits from the light outlet 12, and cuts the to-be-cut foil 101 from the light outlet 12.

[0043] It should be noted that the movement of the reflection structure 30 is completely independent of the conveying structure 10. The conveying structure 10 rotates continuously, the reflection structure 30 does not rotate synchronously with the conveying structure 10, and the reflection structure 30 swings independently.

[0044] Since the pole piece strip 100 moves continuously (in the flow direction) relative to the laser spot, combined with Figures 4 to 7 Those skilled in the art can understand that when the reflection structure 30 makes the spot remain in one position or makes the spot swing along the circumferential direction of the conveying structure 10, the pole piece strip can be cut along the length direction, and the top edge of the tab can be cut out. When the reflection structure 30 makes the spot swing along the axial direction of the conveying structure 10, the pole piece strip can be cut along the width direction, and the side edge of the tab can be cut out.

[0045] Of course, those skilled in the art can understand that the cutting trajectory of the spot is the superposition of the movement of the pole piece strip 100 and the movement of the laser spot. Those skilled in the art can control the cutting trajectory by controlling the above two movements.

[0046] As Figure 2 shown, in the technical solution of this embodiment, there are multiple light outlets 12, and the multiple light outlets 12 are arranged at intervals along the circumferential direction of the conveying structure 10. Specifically, since the conveying structure 10 rolls continuously, in order to ensure the structural integrity of the conveying structure 10, multiple light outlets 12 need to be provided. During the rotation of the conveying structure 10, the multiple light outlets 12 sequentially pass over the reflection surface of the reflection structure 30.

[0047] When the spot completes a section of cutting on the to-be-cut foil 101 at one light outlet 12, and after this light outlet 12 rotates away, the position of the spot is adjusted by the reflection structure 30, so that the spot jumps to the next light outlet to continue cutting the to-be-cut foil 101.

[0048] Preferably, the reflection structure 30 is a reflecting mirror, and the reflecting mirror swings independently relative to the conveying structure 10 and is adapted to make the laser emitted by the laser 20 swing within the range of the light outlet 12. As described above, the reflecting mirror enables the spot of the laser to swing along the circumferential direction of the conveying structure 10, or along the axial direction of the conveying structure 10, or swing in any direction within the range of the light outlet 12.

[0049] As Figure 1 and Figure 2As shown, in the technical solution of this embodiment, a plurality of adsorption holes 13 are provided on the rolling surface of the conveying structure 10, and an adsorption port 14 is provided at the second end of the conveying structure 10. The plurality of adsorption holes 13 and the plurality of adsorption ports 14 are both connected to the inside of the conveying structure 10.

[0050] Specifically, the adsorption port 14 can be connected to an external negative pressure device. When the negative pressure device works, a vacuum can be formed in the internal cavity of the conveying structure 10. When the pole piece strip 100 passes through the conveying structure 10, the pole piece strip 100 adheres tightly to the surface of the conveying structure 10 through the adsorption holes 13, so that the relative position between the pole piece strip 100 and the conveying structure 10 remains stationary, improving the accuracy of tab cutting.

[0051] As Figure 3 shown, the tab cutting device further includes a waste collection structure 40, and the waste collection structure 40 is arranged below the conveying structure 10. Specifically, as Figure 3 can be seen, the waste collection structure 40 is arranged directly below the conveying structure 10, and the waste collection structure 40 is a waste collection box. When the pole piece strip 100 is detected as a NG pole piece, the conveying structure 10 adsorbs the NG pole piece and rotates it to the NG rejection area (i.e., the Figure 3 vacuum-breaking area in), and the cavity of the conveying structure 10 breaks the vacuum to blow the NG pole piece into the waste collection box in the fixed area, so as to realize the simultaneous pole piece waste discharge and tab forming, improving the efficiency of laser tab making.

[0052] As Figure 3 shown, in the technical solution of this embodiment, the tab cutting device further includes a CCD detection structure 50, and the CCD detection structure 50 is arranged outside the conveying structure 10. Specifically, the CCD detection structure 50 detects the shape of the cut tab. If it is found that the cutting shape is unqualified, it is fed back to the reflection structure 30 through the control system and the swinging position of the reflection structure 30 is corrected, so as to realize the closed-loop control of tab cutting.

[0053] As Figure 2 shown, in the technical solution of this embodiment, a cutting groove 15 is provided on the outer surface of the conveying structure 10, and the to-be-cut foil 101 of the pole piece strip 100 is located in the cutting groove 15, and the light outlet 12 is located on the bottom wall of the cutting groove 15. Specifically, the width of the cutting groove 15 is determined according to the width of the to-be-cut foil 101 on the pole piece strip 100, so that the laser can only cut the to-be-cut foil 101 without cutting the coating layer on the pole piece strip 100.

[0054] In addition, the above-mentioned adsorption holes 13 are also provided in the cutting groove 15, and the adsorption holes 13 of the conveying structure 10 adsorb the to-be-cut foil 101 in the cutting groove 15 and fix its position, further improving the tab cutting accuracy.

[0055] Example 2

[0056] As Figure 4 shown, compared with the above Example 1, the tab cutting device of Example 2 is different in that the installation position of the laser 20 and the structure of the conveying structure 10 are different. Specifically, the laser 20 is arranged outside the conveying surface of the conveying structure 10, and the laser emitted by the laser 20 directly irradiates on the conveying structure 10 and cuts the to-be-cut foil 101 of the tab strip 100.

[0057] In Example 2, the galvanometer in the laser 20 forms a reflection structure 30, that is, the laser emitted from the laser head in the laser 20 adjusts the irradiation angle through the galvanometer to achieve the effect of adjusting the position of the light spot on the to-be-cut foil 101.

[0058] Preferably, the conveying structure 10 in Example 2 can be a conveying roller or a flat conveyor belt

[0059] Further, in the tab cutting device of Example 2, when the conveying structure 10 is a conveying roller, there is no need to set a reflector inside the conveying structure 10, and there is also no need to set a light inlet 11 and a light outlet 12 on the conveying structure. Compared with the conveying structure 10 of Example 1, the structure is simplified.

[0060] This embodiment also provides a tab cutting method, which uses the above tab cutting device to cut the tab strip 100. The tab cutting method includes:

[0061] Step S1: The conveying structure 10 conveys the tab strip 100;

[0062] Step S2: The laser 20 emits laser, and the reflection structure 30 makes the laser move on the rolling conveying surface of the conveying structure 10, so as to cut the tab while the tab strip 100 is conveyed, and the tab strip 100 can be slit (which will be described in detail below).

[0063] Through the above tab cutting method, the tab can be cut while the tab strip 100 is conveyed, and the tab strip 100 does not need to stop, realizing the flying cutting process.

[0064] When the tab cutting device is the cutting device of the above Example 1, the laser is injected into the inside of the conveying structure 10 through the light inlet 11, and the emission mirror reflects the laser to the light outlet 12, and the laser is moved on the to-be-cut foil 101 by adjusting the swing angle of the reflection mirror. When the tab cutting device is the cutting device of the above Example 2, the laser adjusts the irradiation angle through the galvanometer to realize the movement of the laser on the to-be-cut foil 101.

[0065] Further, the above step S2 includes:

[0066] Step S21: A laser forms a first cutting segment 200 on the to-be-cut foil 101.

[0067] Step S22: The light spot of the laser moves forward a preset distance relative to the pole piece strip 100 along the flowing direction of the pole piece strip 100.

[0068] Step S23: The laser forms a second cutting segment 300 on the to-be-cut foil 101.

[0069] Step S24: Cutting is reciprocally performed in the manner of Step S21, Step S22, Step S23, Step S22, and Step S21 to alternately form the first cutting segments 200 and the second cutting segments 300 on the to-be-cut foil 101.

[0070] In the above Step S22, the reflection structure 30 controls the moving speed of the light spot to be faster than the flowing speed of the pole piece strip 100 so that the light spot can move forward a certain distance relative to the pole piece strip 100.

[0071] In the above Step S24, by reciprocally performing cutting in the manner of Step S21, Step S22, Step S23, Step S22, and Step S21, multiple first cutting segments 200 and multiple second cutting segments 300 are formed on the to-be-cut foil 101, and there is an overlapping part between adjacent first cutting segments 200 and second cutting segments 300.

[0072] Specifically, in combination with Figure 5 It can be seen that the coating areas on both sides of the pole piece strip 100 and the to-be-cut foil 101 in the middle of the two coating areas, that is, the pole piece strip 100 is intermittently coated in the width direction. Through the above Step S22, an overlapping part is formed between the first cutting segment 200 and the second cutting segment 300 in the length direction of the pole piece strip 100, and strip cutting of the pole piece strip is achieved. That is, in this embodiment, through one laser 20, ear cutting and strip cutting of the pole piece can be simultaneously performed without the need for a hardware cutting mechanism in the prior art for strip cutting of the pole piece. Therefore, the processing efficiency is high and the equipment cost is low.

[0073] As Figure 5 and Figure 6 shown, in the technical solution of this embodiment, the first cutting segment 200 and the second cutting segment 300 overlap in the width direction of the pole piece strip 100. That is, the width of the to-be-cut foil 101 is only the height of one ear, so as to reduce the waste after ear cutting and the material utilization rate is relatively high. In addition, the width of the pole piece strip 100 itself can also be reduced.

[0074] The following details how to simultaneously perform ear cutting and strip cutting of the pole piece through one laser 20 in this embodiment.

[0075] As Figure 5 and Figure 6 shown, the trajectory shapes of a first cutting segment 200 and a second cutting segment 300 are presented, where the dotted line represents the trajectory of the first cutting segment 200 and the dashed line represents the trajectory of the second cutting segment 300. Each number indicates the welding trajectory sequence, and Figure 5 and Figure 6 the pole piece strip 100 flows along the left side.

[0076] Figure 5 and Figure 6 shown, both the first cutting segment 200 and the second cutting segment 300 are U-shaped structures. Specifically, the trajectory of the first cutting segment 200 is 1-2-3-4, and the trajectory of the second cutting segment 300 is 5-6-7-8. Among them, the first cutting segment 200 and the second cutting segment 300 are approximately trapezoidal structures.

[0077] Furthermore, the opening directions of the first cutting segment 200 and the second cutting segment 300 are opposite, and the starting point of the second cutting segment 300 is located on the bottom edge of the first cutting segment 200, and the starting point of the first cutting segment 200 is located on the bottom edge of the second cutting segment 300.

[0078] Combined with Figure 6 it can be seen that the opening of the first cutting segment 200 faces downward, and the opening of the second cutting segment 300 faces upward. Those skilled in the art can understand that point 1 is the starting point of the first cutting segment 200, point 4 is the end point of the first cutting segment 200, point 5 is the starting point of the second cutting segment 300, and point 8 is the end point of the second cutting segment 300. For the starting point of the second cutting segment 300, through the above step S22, point 5 is located in front of point 4, and point 5 is located on the cutting segment between points 2 and 3.

[0079] After the second cutting segment 300 is cut, when cutting the next first cutting segment 200, perform the above step S22 once, so that point 1 is located in front of point 8, and point 1 is located on the cutting segment between points 6 and 7.

[0080] In addition, combined with Figure 6 it can also be seen that the starting point of the first cutting segment 200 is the top of the tab. Compared with the second cutting segment 300, the top of the tab is not chamfered. The starting point and the end point of the path of the first cutting segment 200 are on both sides of the top of the tab. Since the tab needs to be pre-welded and cut in subsequent processes, the non-chamfering does not affect the processing quality of the tab.

[0081] After reciprocating cutting, that is, it forms Figure 5The cutting shape described in [reference]. In this cutting shape, points A and B are points 7 and 8 of the previous second cutting segment 300, and points C and D are points 1 and 2 of the subsequent first cutting segment. Figure 4 In [reference], the area A-B-5-6 is the tab of one side electrode tab (the lower side electrode tab in the figure), and the area 3-4-C-D is the tab of the other side electrode tab (the upper side electrode tab in the figure). At the same time, the areas 1-2-B-A, 3-4-6-5, and 8-7-C-D are all waste materials and are cut off, thereby striping the electrode tabs on both sides.

[0082] When the tab waste after cutting the first cutting segment 200 and the second cutting segment 300 flows to below the waste collection structure 40, it falls into the waste collection structure 40.

[0083] It can be seen that after the light spot reciprocally cuts through the above tab cutting method, while forming the tabs of the electrode tabs on both sides, the striping of the electrode tabs is also achieved, greatly improving the processing efficiency.

[0084] In addition, after the laser cuts the first cutting segment 200 and before the laser cuts the second cutting segment 300, there is a risk of waste material jitter. The waste material jitter will cause unstable tab cutting and affect the accuracy of tab cutting. In this embodiment, the conveying roller is provided with adsorption holes 13 in the cutting groove 15, and the adsorption holes can adsorb the tab waste, thereby preventing the jitter of the tab waste.

[0085] Furthermore, as described above, when the tab cutting device is the tab cutting device of the first embodiment above, the light outlet 12 of the conveying structure 10 is multiple, and the multiple light outlets 12 are arranged at intervals along the circumferential direction of the conveying structure 10. In step S2, the first cutting segment 200 and the second cutting segment 300 are respectively cut at adjacent light outlets 12. That is, when the light spot finishes cutting the first cutting segment 200, the light spot is controlled by the reflection structure 30 to jump to another light outlet and cut the second cutting segment 300.

[0086] Furthermore, the above step S22 can be that the position of the light spot is adjusted when it jumps from one light outlet 12 to another light outlet 12.

[0087] Figure 7 and Figure 8 shows another trajectory shape of the first cutting segment 200 and the second cutting segment 300. Among them, the dotted line represents the trajectory of the first cutting segment 200, and the dashed line represents the trajectory of the second cutting segment 300. Each number represents the welding trajectory sequence, and Figure 6 and Figure 7 the electrode tab strip 100 flows along the left side in [reference].

[0088] Further, both the first cutting segment 200 and the second cutting segment 300 are irregular structures. Specifically, the trajectory of the first cutting segment 200 is 1-2-3-4-5-6-7-8, and the trajectory of the second cutting segment 300 is 9-10-11-12-13-14-15-16.

[0089] Further, the irregular shapes of the first cutting segment 200 and the second cutting segment 300 are exactly the same. Specifically, both the first cutting segment 200 and the second cutting segment 300 include a tooth-shaped portion 401, and upper extension segments 402 and lower extension segments 403 connected to both ends of the tooth-shaped portion 401. Combining Figure 7 It can be seen that for the first cutting segment 200, the trajectory 2-3-4-5-6-7 forms the tooth-shaped portion 401, the trajectory 1-2 forms the upper extension segment, and the trajectory 7-8 forms the lower extension segment. For the second cutting segment 300, the trajectory 10-11-12-13-14-15 forms the tooth-shaped portion 401, the trajectory 9-10 forms the upper extension segment, and the trajectory 15-16 forms the lower extension segment.

[0090] As Figure 7 shown, in the technical solution of this embodiment, at the connection of adjacent first cutting segment 200 and second cutting segment 300, the upper extension segment 402 and the lower extension segment 403 are arranged in parallel, and both the upper extension segment 402 and the lower extension segment 403 are connected to the outer edge of the tooth tip of the tooth-shaped portion 401. Specifically, those skilled in the art can understand that point 1 is the starting point of the first cutting segment 200, point 8 is the ending point of the first cutting segment 200, point 9 is the starting point of the second cutting segment 300, and point 8 is the ending point of the second cutting segment 300.

[0091] For the starting point of the second cutting segment 300, through the above step S22, it is moved forward relative to the ending point of the first cutting segment 200, and from Figure 7 it can be seen that point 9 is moved forward to coincide with point 6, that is, to coincide with the outer edge of the tooth tip of the tooth-shaped portion 401 of the first cutting segment 200 (that is, Figure 7 point 6 in Figure 7 ). In addition, when cutting the trajectories of points 10 and 11, point 11 is made to coincide with point 8, that is, point 8 coincides with the outer edge of the tooth tip of the tooth-shaped portion 401 of the second cutting segment 300 (that is,

[0092] point 11 in Figure 7The cutting shape described in [reference]. In this cutting shape, regions 2-3-4-5 and 10-11-12-13 are the tabs of one side of the pole piece, regions 4-5-6-7 and 12-13-14-15 are the tabs of the other side of the pole piece. At the same time, regions 6(9)-7-8(11)-10 are waste materials and are cut off, thereby striping the pole pieces on both sides. And the tabs on both sides are connected to each other, that is, each cutting path can cut out the tabs on both sides.

[0093] The form of the second first cutting segment 200 and the second cutting segment 300 is the same as the first one described above in terms of structure and walking path, and the spot control is simpler.

[0094] According to the above content, this patent application has the following advantages:

[0095] 1. Using a set of lasers to achieve the cutting of the pole piece tabs and the striping function of the pole piece, greatly improving the cutting efficiency;

[0096] 2. The width of the blank area of the pole piece tab (that is, the area of the to-be-cut foil 101) can be set to the height of a single tab, reducing the width of the pole piece coating and the waste rate of the foil, saving costs;

[0097] 3. The vacuum roller adsorbs and fixes the pole piece strip 100 before cutting, avoiding the poor cutting caused by the shaking of the waste strip during cutting, and improving the cutting quality.

[0098] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A tab cutting method, characterized in that: A tab cutting device is used to cut a pole piece strip (100), wherein the pole piece strip is intermittently coated in a width direction, and the pole piece strip comprises coating areas on both sides and a foil to be cut located in the middle of the two coating areas. The tab cutting method comprises: Step S1: The conveying structure (10) circulates the electrode material strip (100); Step S2: the laser (20) emits laser light, and the reflective structure (30) causes the laser light to move on the conveying surface of the conveying structure (10), so that the pole piece strip (100) is circulated while the pole lug is cut, and striping of the pole piece strip is achieved; The step S2 comprises: Step S21: the laser forms a first cutting segment (200) on the foil (101) to be cut; Step S22: the laser spot moves forward a preset distance relative to the pole piece strip (100) along the direction of rotation of the pole piece strip (100); Step S23: the laser forms a second cutting segment (300) on the foil (101) to be cut; Step S24: Cutting is performed reciprocally in the manner of step S21, step S22, step S23, step S22, and step S21 to alternately form a first cutting segment (200) and a second cutting segment (300) on the foil to be cut (101), so that there is an overlapping portion between the first cutting segment and the second cutting segment in the length direction of the pole piece strip, and the pole piece strip is stripped, so that the pole ear cutting and the pole piece stripping are performed simultaneously by a laser.

2. The tab cutting method according to claim 1, wherein: The first cutting segment (200) and the second cutting segment (300) overlap in the width direction of the pole piece strip (100).

3. The tab cutting method according to claim 1 or 2, characterized in that: The first cutting segment (200) and the second cutting segment (300) are both U-shaped structures, wherein the opening directions of the first cutting segment (200) and the second cutting segment (300) are opposite, and the starting point of the second cutting segment (300) is located on the bottom edge of the first cutting segment (200), and the starting point of the first cutting segment (200) is located on the bottom edge of the second cutting segment (300).

4. The tab cutting method according to claim 1 or 2, characterized in that: The first cutting segment (200) and the second cutting segment (300) both include a tooth-shaped portion (401), and an upper extension segment (402) and a lower extension segment (403) connected at both ends of the tooth-shaped portion (401); at the connection between the adjacent first cutting segment (200) and the second cutting segment (300), the upper extension segment (402) and the lower extension segment (403) are arranged in parallel, and the upper extension segment (402) and the lower extension segment (403) are both connected to the outer edge of the tooth top of the tooth-shaped portion (401).

5. The tab cutting method according to claim 1 or 2, characterized in that: The tab cutting device comprises: A conveying structure (10) adapted to convey the electrode strip (100); a laser (20) disposed on a side of the conveying structure (10) and adapted to emit laser light toward a conveying surface of the conveying structure (10); The reflective structure (30) is suitable for causing the laser light emitted by the laser (20) to move on the rolling surface of the conveying structure (10).

6. The tab cutting method according to claim 5, characterized in that: The conveying structure (10) is a conveying roller, and the conveying structure (10) is a hollow structure. A light inlet (11) is provided at the first end of the conveying structure (10), and a light outlet (12) is provided on the rolling surface of the conveying structure (10). Both the light inlet (11) and the light outlet (12) are connected to the interior of the conveying structure (10). The laser (20) is provided on the axial side of the conveying structure (10) and is suitable for emitting laser light toward the light inlet (11). The reflective structure (30) is swingably provided in the conveying structure (10) and is suitable for reflecting the laser light emitted by the laser (20) toward the light outlet (12).

7. The tab cutting method according to claim 6, characterized in that: There are multiple light outlets (12), and the multiple light outlets (12) are arranged at intervals along the circumference of the conveying structure (10); in the step S2, the first cutting section (200) and the second cutting section (300) respectively cut at adjacent light outlets (12).

8. The tab cutting method according to claim 6, characterized in that: The reflection structure (30) is a reflection mirror, which swings independently relative to the conveying structure (10) and is suitable for causing the laser light emitted by the laser (20) to swing within the range of the light outlet (12).

9. The tab cutting method according to claim 6, characterized in that: A plurality of adsorption holes (13) are provided on the rolling surface of the conveying structure (10), and a second end of the conveying structure (10) is provided with an adsorption port (14), and the plurality of adsorption holes (13) and the plurality of adsorption ports (14) are both connected to the interior of the conveying structure (10).

10. The tab cutting method according to claim 5, characterized in that: The laser (20) is arranged outside the conveying surface of the conveying structure (10), the reflection structure (30) is a galvanometer of the laser (20), and the conveying structure (10) is a conveying roller or a conveying belt.

11. The tab cutting method according to claim 5, characterized in that: The tab cutting device further comprises a waste collection structure (40), and the waste collection structure (40) is arranged below the conveying structure (10).

12. The tab cutting method according to claim 5, characterized in that: The tab cutting device further comprises a CCD detection structure (50), and the CCD detection structure (50) is arranged outside the conveying structure (10).

13. The tab cutting method according to claim 5, characterized in that: The outer surface of the conveying structure (10) is provided with a cutting groove (15), and the foil material (101) to be cut of the electrode strip (100) is located in the cutting groove (15).

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