Tab shaping method, tab shaping equipment and battery cell processing system

Abstract

The present invention relates to the technical field of battery manufacturing, and provides a method for shaping a pole lug, a pole lug shaping device, and a battery cell processing system. A conveying device conveys a pole sheet strip and a diaphragm to a winding device for winding, and in the process of conveying the pole sheet strip, the pole lug is cut and bent online, and the pole lug is smoothed during winding. After winding, the pole lug at the end of the winding core can be flattened. The loading and unloading and transfer operations of materials between the various processes in the conventional process are omitted, thereby optimizing the production process. The orderly bending and smoothing of the pole lug can keep the pole lug bent toward the middle of the winding core, avoiding damage or disorder of the pole lug, so that the rotation speed of the winding needle can be increased accordingly, thereby significantly improving the winding efficiency, which is beneficial to improving the battery cell production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of battery manufacturing, and in particular to a tab shaping method, tab shaping equipment and a battery core processing system. Background Art

[0002] With the rapid development of lithium batteries, higher requirements are placed on battery production efficiency and product quality. In the battery manufacturing process, the winding efficiency of the battery cell and the quality after winding are the key factors affecting the battery production efficiency and product quality. In related technologies, it is very easy for the tabs to fold, wrinkle, or become disordered when the battery cell is wound, resulting in damage to the tabs. Therefore, it is necessary to inspect, repair, and reshape the bad tabs after winding, resulting in low production efficiency. In addition, the damaged tabs seriously affect the quality of the battery. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a tab shaping method, which can shape the tab during the winding process, thereby helping to improve the production efficiency and quality of the battery cell.

[0004] The present invention also provides a tab shaping device and a battery core processing system having the tab shaping device.

[0005] A method for shaping a tab according to an embodiment of the first aspect of the present invention includes:

[0006] The pole piece strip is conveyed to the winding needle by a conveying device, and the winding needle is rotated to wind the pole piece strip to form a winding core;

[0007] On the conveying path of the pole sheet material strip and before the pole sheet material strip is rolled, the pole ear of the pole sheet material strip is bent toward the inner side of the pole sheet material strip;

[0008] During the winding process of the winding needle, the pole ear wound on the winding needle is smoothed toward the end of the winding core at the set position at the end of the winding core until the winding core is wound to the set thickness and the winding is stopped;

[0009] The core wound to a set thickness is unloaded, and the tabs at the ends of the core are pressed flat toward the ends of the core.

[0010] The method for shaping the pole lugs of the embodiments of the present invention has at least the following beneficial effects: the method bends the pole lugs before winding the pole sheet material strip, smoothes the pole lugs during winding, and flattens the pole lugs after winding. The pole lugs can be bent, shaped and wound online without stopping the machine, thus avoiding defects such as folding, wrinkling and disorder of the pole lugs, and eliminating subsequent inspection, repair and shaping work, thereby helping to improve the production efficiency of the battery.

[0011] According to some embodiments of the present invention, during the winding process of the winding needle, at the junction of the pole sheet strip to be wound and the winding core wound on the winding needle, the pole ears of the pole sheet strip and the pole ears of the winding core are shielded to avoid interference between the pole ears of the pole sheet strip and the pole ears of the winding core during winding.

[0012] A second aspect of the present invention provides a tab shaping device, comprising:

[0013] A winding device, comprising a winding mechanism and a tab smoothing mechanism, wherein the winding mechanism comprises a winding needle and a winding needle driving assembly for driving the winding needle to rotate, wherein the winding needle is used to wind the pole piece strip and the diaphragm strip to form a winding core, wherein the pole piece strip has an inner side and an outer side, and when winding, the inner side of the pole piece strip faces the winding needle, and the tab smoothing mechanism is used to smooth the tab of the winding core toward the end of the winding core;

[0014] A conveying device, used for conveying the pole piece material strip and the diaphragm material strip to the winding needle respectively;

[0015] A tab bending device is provided on the conveying path of the pole sheet material strip, and is used to bend the tab of the pole sheet material strip toward the inner side of the pole sheet material strip before the pole sheet material strip is rolled; and

[0016] The tab flattening device includes a bearing mechanism and a pressing mechanism, wherein the bearing mechanism includes a bearing member, and the bearing member is used to bear the side of the winding core; the pressing mechanism includes a pressing head and a pressing drive assembly, wherein the pressing head corresponds to the end of the winding core, and the pressing drive assembly is used to drive the pressing head to move relative to the bearing member to approach the end of the winding core, and the pressing head can press the tab of the winding core toward the end of the winding core.

[0017] The tab shaping equipment of the second embodiment of the present invention has at least the following beneficial effects: the tab bending device can roll and bend the tabs of the pole sheet material strip during the tape walking process without stopping before winding, and the tab smoothing mechanism can smooth the bent tabs on the winding needle when the pole sheet material strip is wound. The bent tabs can effectively eliminate the impact on the tabs at the tab smoothing mechanism when the core is wound, and the tabs are bent toward the inner side of the pole sheet material strip, which helps the tab smoothing mechanism to smooth the tabs on the same side. After the tabs are smoothed, the tabs can effectively avoid folding, wrinkling, disorder and other undesirable phenomena during the winding process, thereby achieving the purpose of not damaging the tabs. The tab flattening device can flatten the tabs of the wound core to the end face of the core for the next step, thereby improving the winding quality of the core and helping to improve the production efficiency of the battery cell.

[0018] According to some embodiments of the present invention, the pole lug shaping equipment also includes a frame, and the pole lug smoothing mechanism includes a bracket and a first guide mechanism, the bracket is connected to the frame, the bracket is provided with a mounting portion, the first guide mechanism includes a fixing member, the fixing member is located at the protruding end of the pole lug of the winding core and is connected to the mounting portion, along the circumference of the winding needle, the fixing member includes a feed end and a discharge end, and the pole lug of the winding core can enter between the fixing member and the end of the winding core from the feed end and move out from the discharge end as the winding needle rotates, and the fixing member is used to smooth the pole lug of the winding core toward the end of the winding core.

[0019] According to some embodiments of the present invention, the fixing member has a guide surface on one side of the end portion of the winding core, and the distance between the guide surface and the end portion of the winding core gradually decreases from the feeding end to the discharging end, and the guide surface is used to smooth the pole ear of the winding core toward the end portion of the winding core.

[0020] According to some embodiments of the present invention, the pole lug smoothing mechanism also includes a second guiding mechanism, which includes a movable part and a driving assembly, and the movable part is arranged on one side of the winding needle corresponding to the end of the winding core with the pole lug, and the movable part includes a connecting part and a guiding part, and the connecting part is connected to the mounting part, and the guiding part is located on one side of the feeding end, and can be shielded between the pole lug of the winding core and the pole lug of the pole sheet strip at the junction of the winding core and the pole sheet strip to be wound, and the driving assembly is used to drive the movable part to move relative to the fixed part until the guide part is located at the junction.

[0021] According to some embodiments of the present invention, the driving assembly includes a driving element and a connecting plate, the connecting plate is connected to the mounting portion, the connecting plate is provided with a guide groove, the connecting portion is connected to a guide column, the guide column is passed through the guide groove and can move along the guide groove, the driving element is used to drive the connecting portion to move, and the guide groove is used to limit the moving path of the guide column.

[0022] According to some embodiments of the present invention, the pole ear bending device includes a roller mechanism and a roller clamping mechanism, the roller mechanism is used to support the outer side of the pole sheet material strip and convey the pole sheet material strip, the roller mechanism is provided with a die at a position corresponding to the pole ear of the pole sheet material strip, the opening of the die is facing the inner side of the pole sheet material strip, and the roller clamping mechanism corresponds to the position of the die, and is used to roll and bend the pole ear located on the die.

[0023] According to some embodiments of the present invention, the pole ear bending device also includes a mounting base and a pressure roller clamping mechanism, the pressure roller clamping mechanism and the over-rolling mechanism are both arranged on the mounting base, the pressure roller clamping mechanism is used to press the pole piece strip onto the over-rolling mechanism, the roller clamping mechanism is arranged on the pressure roller clamping mechanism, and the over-rolling mechanism, the roller clamping mechanism and the pole piece strip can move at equal linear speeds.

[0024] According to some embodiments of the present invention, the carrier is used to carry a plurality of the winding cores, the pressing head is located corresponding to a set position of the carrier, and the carrier mechanism further includes a conveying component, which is used to drive the carrier to move relative to the pressing head so as to convey the winding core to a position corresponding to the pressing head.

[0025] According to some embodiments of the present invention, the delivery device comprises:

[0026] A positive electrode sheet conveying mechanism, used for conveying the positive electrode sheet strip to the winding needle;

[0027] A negative electrode sheet conveying mechanism is used to convey the negative electrode sheet material strip to the winding needle, the positive electrode lugs on the positive electrode sheet material strip and the negative electrode lugs on the negative electrode sheet material strip are respectively oriented in opposite directions along the axial direction of the winding needle, and the positive electrode lugs and negative electrode lugs wound on the winding needle are respectively oriented toward the two ends of the winding core;

[0028] A first diaphragm conveying mechanism is used to convey the diaphragm material strip to the winding needle between the positive electrode sheet material strip and the negative electrode sheet material strip; and

[0029] The second diaphragm conveying mechanism is used to convey the diaphragm material strip to the winding needle between the pole piece material strip and the winding needle.

[0030] According to some embodiments of the present invention, the winding needle is used to wind the positive electrode sheet material strip, the negative electrode sheet material strip and the separator sheet material strip to form a winding core, the positive electrode sheet material strip and the negative electrode sheet material strip respectively have an inner side and an outer side, and when winding, the inner sides of the positive electrode sheet material strip and the negative electrode sheet material strip face the winding needle;

[0031] The winding device is provided with the tab smoothing mechanism at both ends of the winding core, respectively, for smoothing the positive tabs and negative tabs at both ends of the winding core toward the end of the winding core;

[0032] The tab bending device is provided on the conveying path of the positive electrode sheet material strip, and is used to fold the positive electrode tab toward the inner side of the positive electrode sheet material strip;

[0033] The tab bending device is also provided on the conveying path of the negative electrode sheet material strip, and is used to bend the negative electrode tab toward the inner side of the negative electrode sheet material strip.

[0034] According to the third aspect of the present invention, the battery cell processing system includes a laser cutting device and the pole tab shaping equipment of the second aspect. The laser cutting device is arranged on the conveying path of the pole sheet strip between the conveying device and the pole tab bending device, and is used to process the pole tabs on the pole sheet strip.

[0035] The battery cell processing system of the third aspect embodiment of the present invention has at least the following beneficial effects: the battery cell processing system cuts the pole tabs online through a laser cutting device, and bends the pole tabs before winding the material strip, smoothes the pole tabs during winding, and flattens the pole tabs after winding through the above-mentioned pole tab shaping equipment. Thus, the pole tab cutting, online bending, shaping, winding and flattening can be completed without stopping the machine, reducing the transfer process and helping to improve production efficiency.

[0036] According to some embodiments of the present invention, the laser cutting device includes a laser head, a feeding device, a cutting pallet and a waste separation device, the feeding device includes a feed roller and a discharge roller arranged at intervals, the cutting pallet is arranged between the feed roller and the discharge roller, and the cutting pallet is provided with a first negative pressure port, a second negative pressure port and a third negative pressure port in sequence along the conveying direction of the electrode material strip, the laser head can cut the material strip passing through the second negative pressure port, and the waste separation device can separate the waste after cutting and separation from the material strip.

[0037] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0039] Figure 1 It is a structural schematic diagram of a tab shaping device according to an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the structure of the tab bending device in an embodiment of the present invention;

[0041] Figure 3 It is a schematic structural diagram of a tab bending device (with a motor attached) in an embodiment of the present invention;

[0042] Figure 4 It is a structural schematic diagram of a tab bending device (with a transmission member added) in another embodiment of the present invention;

[0043] Figure 5 A partial structural schematic diagram of a concave die and a convex die in a tab bending device in an embodiment of the present invention;

[0044] Figure 6It is another partial schematic diagram of the structure of the female mold and the male mold in the tab bending device in the embodiment of the present invention;

[0045] Figure 7 It is another partial schematic diagram of the structure of the female mold and the male mold in the tab bending device in the embodiment of the present invention;

[0046] Figure 8 is a schematic diagram of a winding device in one embodiment of the present invention;

[0047] Fig. 9 for Figure 8 A front view of

[0048] Fig.10 for Fig. 9 A-direction schematic diagram;

[0049] Fig.11 for Fig.10 A local enlarged schematic diagram of point B in FIG.

[0050] Fig.12 is a schematic structural diagram of a fixing member in one embodiment of the present invention;

[0051] Fig.13 It is a structural schematic diagram of a movable part in one embodiment of the present invention;

[0052] Fig.14 A schematic diagram showing that the position of the joint between the pole piece strip and the winding core changes as the thickness of the winding core increases;

[0053] Fig.15 for Figure 1 A schematic diagram of a transport device in an embodiment;

[0054] Fig.16 for Figure 1 Schematic diagram of the tab flattening device in the embodiment

[0055] Fig.17 It is a structural schematic diagram of a battery core processing system according to an embodiment of the present invention;

[0056] Fig.18 for Fig.17 A schematic diagram of the structure of a laser cutting device in an embodiment;

[0057] Fig.19 for Fig.17 A simplified schematic diagram of a laser cutting device in an embodiment;

[0058] Fig. 20 for Fig.17 Right view of;

[0059] Fig.21 for Fig.17A schematic diagram of the structure of the dust removal blade assembly, the front dust removal cover and the waste separation device in the embodiment;

[0060] Fig. 22 is a schematic diagram of a cutting pallet in a laser cutting device;

[0061] Fig.23 for Fig. 22 A cross-sectional view along section CC in FIG.

[0062] Fig.24 It is a front view of the pole piece strip of the present invention before the pole lug is processed;

[0063] Fig.25 This is a front view of the pole piece strip of the present invention after the pole ear is processed by a laser cutting device.

[0064] Reference numerals:

[0065] Winding core 1, pole piece strip 2, edge area 21, waste material 22, pole ear 3, diaphragm strip 4;

[0066] Winding device 100;

[0067] Winding needle 110, bracket 120, first guide mechanism 130, fixing member 131, feeding end 132, discharging end 133, guide surface 134, second guide mechanism 140, movable member 141, connecting portion 142, guiding portion 143, guiding edge 144, shielding surface 145, driving assembly 146, gear 1461, rack 1462, connecting plate 147, guide groove 148, guide column 149, joint 150, joint position change curve 151;

[0068] Conveying device 200;

[0069] A positive electrode sheet conveying mechanism 210, a negative electrode sheet conveying mechanism 220, a first diaphragm conveying mechanism 230, a second diaphragm conveying mechanism 240, and a tensioning roller 250;

[0070] Tab bending device 300;

[0071] Installing base 310, roller mechanism 320, die 321, roller wheel 322, roller shaft 323, roller pressing mechanism 330, first driving member 331, first output end 3311, support 332, first roller 333, roller pressing mechanism 340, second driving member 341, second output end 3411, first connecting member 342, first connecting end 3421, second connecting end 3422, second roller 343, convex die 3431, first motor 344, third output end 3441, transmission member 345, first gear 3451, second gear 3452;

[0072] Tab flattening device 400;

[0073] Carrying mechanism 410, carrying member 411, transmission assembly 412, pressing mechanism 420, pressing head 421, pressing driving assembly 422, pressing bracket 423;

[0074] Laser cutting device 500;

[0075] Laser head 510, feeding device 520, frame 521, feeding roller 522, discharging roller 523, dust removal knife assembly 530, front dust removal cover 540, side dust removal cover 550, waste separation device 560, driving device 561, driving roller 562, belt 563, through hole 5631, driven roller 564, cutting support plate 570, first negative pressure port 571, second negative pressure port 572, third negative pressure port 573;

[0076] The transport device 600 , the clamping jaw 610 , the clamping jaw opening and closing mechanism 620 , and the moving mechanism 630 . DETAILED DESCRIPTION

[0077] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0078] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present invention.

[0079] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0080] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0081] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] The first aspect of the present invention provides a method for shaping a pole ear: a pole sheet material strip is conveyed to a winding needle by a conveying device, and the winding needle is rotated to wind the pole sheet material strip to form a winding core; on the conveying path of the pole sheet material strip and before the pole sheet material strip is wound, the pole ear of the pole sheet material strip is bent toward the inner side of the pole sheet material strip; the inner side of the pole sheet material strip is wound toward the winding needle, and during the winding process of the winding needle, the pole ear wound on the winding needle is flattened toward the end of the winding core at a set position at the end of the winding core until the winding core is wound to a set thickness and the winding is stopped; the winding core wound to a set thickness is discharged, and the pole ear at the end of the winding core is flattened toward the end of the winding core. This method bends the tabs before winding the pole sheet material strip, smoothes the tabs during winding, and flattens the tabs after winding. The tabs can be bent, shaped, and wound online without stopping the machine, avoiding defects such as tab folding, wrinkling, and disorder, and eliminating subsequent inspection, rework, and shaping work, which helps to improve the production efficiency of the battery. The tabs of the pole sheet material strip are bent toward the inside of the pole sheet material strip, and the inside of the pole sheet material strip is wound toward the winding needle, so that the tabs rolled on the winding needle are bent toward the winding needle, which facilitates the smoothing and flattening of the tabs. In addition, during the winding process, the tabs of each layer of the winding core can be layered in an orderly manner to avoid staggered layers between the tabs.

[0083] In addition, in the conventional tab winding process, since the tabs wound on the winding needle are very likely to be turned inside out, disordered or interfere with the tabs to be wound due to centrifugal force, the winding speed needs to be limited within a certain range. The tab shaping method of the present invention, when applied to the production of battery cells, can prevent the tabs of the winding core from turning inside out, wrinkling, disordering and other undesirable phenomena due to the centrifugal force of winding. Therefore, compared with the conventional tab winding process, the winding speed can be further increased, for example, by increasing the rotation speed of the winding needle, thereby significantly improving the winding efficiency.

[0084] In the above method, during the winding process of the winding needle, at the junction of the pole piece strip to be wound and the winding core wound on the winding needle, the pole ears of the pole piece strip and the pole ears of the winding core can be shielded to avoid interference between the pole ears of the pole piece strip and the pole ears of the winding core during winding. During winding, the pole ears of each layer on the winding core are bent at the same angle toward the winding needle, so that the pole ears of different layers do not interfere with each other, and the pole ears of the pole piece strip to be wound and the pole ears of the winding core are shielded, so that the pole ears of different layers can be prevented from colliding with each other, resulting in defects such as disorder and folding of the pole ears, thereby ensuring orderly stratification of the pole ears.

[0085] Figure 1 The structure diagram of the tab shaping device according to the embodiment of the present invention is shown in FIG. Figure 1 The second aspect of the present invention provides a tab shaping device, including a winding device 100, a conveying device 200, a tab bending device 300 and a tab flattening device 400. The winding device 100 is used to wind the pole sheet strip 2, the conveying device 200 is used to convey the pole sheet strip 2 and the diaphragm strip 4 to the winding device 100, the tab bending device 300 is used to bend the tab 3 on the pole sheet strip 2, and the tab flattening device 400 is used to flatten the tab 3 of the wound core 1 toward the end of the core 1 so as to enter the next processing step.

[0086] The winding device 100 includes a winding mechanism and a tab smoothing mechanism. The winding mechanism includes a winding needle 110 and a winding needle driving assembly for driving the winding needle 110 to rotate. The winding needle 110 is used to wind the pole piece strip 2 and the diaphragm strip 4 to form a winding core 1. The pole piece strip 2 has an inner side and an outer side. When winding, the inner side of the pole piece strip 2 faces the winding needle 110. The tab smoothing mechanism is used to smooth the pole tab 3 of the winding core 1 toward the end of the winding core 1. The conveying device 200 is used to convey the pole piece strip 2 and the diaphragm strip 4 to the winding needle 110 respectively.

[0087] The tab bending device 300 is arranged on the conveying path of the pole sheet material strip 2, and is used to bend the tab 3 of the pole sheet material strip 2 toward the inner side of the pole sheet material strip 2 before the pole sheet material strip 2 is wound. The tab bending device 300 can bend the tab 3 of the pole sheet material strip 2 during the tape walking process without stopping before winding, and the bent tab 3 can effectively eliminate the impact of the tab 3 on the tab smoothing mechanism when the winding core 1 is wound, and the tab 3 is bent toward the inner side of the pole sheet material strip 2, and when the pole sheet material strip 2 is wound, the tab smoothing mechanism can smooth the bent tab 3 wound on the winding needle 110, which helps the tab smoothing mechanism to smooth the tab 3 toward the same side. After the tab 3 is smoothed, it can effectively avoid the undesirable phenomena such as the tab 3 being folded, wrinkled, and disordered during the winding process, and avoid the tab 3 being damaged.

[0088] The tab flattening device 400 includes a bearing mechanism 410 and a pressing mechanism 420. The bearing mechanism 410 includes a bearing member 411, which is used to bear the side of the core 1. The pressing mechanism 420 includes a pressing head 421 and a pressing drive assembly 422. The pressing head 421 corresponds to the end of the core 1. The pressing drive assembly 422 is used to drive the pressing head 421 to move relative to the bearing member 411 to approach the end of the core 1. The pressing head 421 can press the tab 3 of the core 1 toward the end of the core 1. Therefore, the tab flattening device 400 can flatten the tab 3 of the core 1 to the end surface of the core 1 after winding, so as to carry out the next step.

[0089] As can be seen from the above, the pole ear 3 shaping equipment of the embodiment of the present invention bends the pole ear 3 before winding, smoothes the pole ear 3 during winding, and flattens the pole ear 3 after winding is completed, and can be performed during the conveying process of the pole sheet material strip 2, without stopping the operation, avoiding the material transfer, loading and unloading operations between multiple processes, thereby improving the production efficiency of the battery cell. Shaping the pole ear 3 can avoid the above-mentioned undesirable phenomena of the pole ear 3 and effectively improve the winding quality of the winding core 1. In addition, during winding, the bent and smoothed pole ear 3 can avoid undesirable phenomena such as eversion, wrinkles, and disorder due to the action of centrifugal force. Therefore, compared with the conventional pole ear 3 winding process, the pole ear 3 shaping equipment of the embodiment of the present invention can further increase the winding speed when used in production, such as increasing the rotation speed of the winding needle 110, thereby significantly improving the winding efficiency.

[0090] In some embodiments, the winding mechanism may include one winding needle 110 to form a single-station winding mechanism, or the winding mechanism may include multiple winding needles 110 to form a multi-station winding mechanism. For example, it may include 2 or 3 winding needles 110. After winding at one station is completed, other winding needles 110 can be rotated to continue winding, and the wound core 1 can be unloaded at the same time, thereby avoiding the time occupied by the winding mechanism for unloading, which can effectively improve the winding and shaping efficiency of the tab 3.

[0091] Figures 2 to 7 FIG. 2 shows a schematic diagram of the structure of the tab bending device in some embodiments. Figure 2In some embodiments, the pole tab bending device 300 includes a roller mechanism 320 and a roller clamping mechanism 340. The roller mechanism 320 is used to support the outer side of the pole sheet material strip 2 and convey the pole sheet material strip 2. A die 321 is provided at the position of the pole tab 3 of the pole sheet material strip 2 on the roller mechanism 320. The opening of the die 321 faces the inner side of the pole sheet material strip 2. The roller clamping mechanism 340 corresponds to the position of the die 321 and is used to roll and bend the pole tab 3 located on the die 321. As a result, the pole tab 3 of the pole sheet material strip 2 can be bent toward the inner side of the pole sheet material strip 2. After the pole sheet material strip 2 is rolled into and forms a winding core 1 on the winding needle 110, the pole tab 3 facing the inner side of the pole sheet material strip 2 is bent toward the direction of the winding needle 110, which can effectively avoid folding outward with the rotation of the winding core 1, so that the pole tab smoothing mechanism at the winding device 100 can squeeze the end face of the winding core 1 on the same side to avoid damage to the pole tab 3.

[0092] Reference Figure 2 In some embodiments, the tab bending device 300 further includes a mounting base 310 and a roller clamping mechanism 330. The roller clamping mechanism 330 and the over-rolling mechanism 320 are both arranged on the mounting base 310. The roller clamping mechanism 330 is used to press the pole piece strip 2 onto the over-rolling mechanism 320. The roller clamping mechanism 340 is arranged on the roller clamping mechanism 330. The over-rolling mechanism 320, the roller clamping mechanism 340 and the pole piece strip 2 can move at equal linear speeds. The roller clamping mechanism 330 is located on the side of the over-rolling mechanism 320 facing the inner side of the pole piece strip 2. The roller clamping mechanism 330 can apply pressure from the inner side of the pole piece strip 2, so that the roller clamping mechanism 330 can press the pole piece strip 2 onto the over-rolling mechanism 320. The roller clamping mechanism 340 is arranged on the pressure roller clamping mechanism 330, and the roller clamping mechanism 340 is located at the position of the pressure roller clamping mechanism 330 corresponding to the pole ear 3. When the roller clamping mechanism 340 rolls and bends the pole ear 3 located on the die 321, the pressure roller clamping mechanism 330 and the roller clamping mechanism 340 are in contact with the inner side of the pole sheet material strip 2, and the over-rolling mechanism 320 is in contact with the outer side of the pole sheet material strip 2, so that the pole sheet material strip 2 can drive the over-rolling mechanism 320, the pressure roller clamping mechanism 330 and the roller clamping mechanism 340 to move at the same linear speed during the movement. As a result, the pole ear 3 can be bent without stopping during the running of the pole sheet material strip 2, which helps to eliminate the impact at the bending position of the pole ear 3, thereby achieving the purpose of not damaging the pole ear 3.

[0093] Reference Figures 2 to 4In some embodiments, the roller pressing mechanism 330 includes a first driving member 331, a support 332, and a first roller 333. The upper end of the first driving member 331 is connected to the mounting base 310, the first driving member 331 has a first output end 3311, the support 332 is arranged at the first output end 3311, the roller mechanism 320 is located below the support 332, the first driving member 331 can drive the first output end 3311 to move up and down in the vertical direction, the first roller 333 is arranged at the lower end of the support 332, and the first roller 333 is rotatably connected to the support 332. It can be understood that the first driving member 331 can drive the first roller 333 to move downward to press the inner side of the pole piece strip 2, and the roller mechanism 320 supports the outer side of the pole piece strip 2. When the pole piece strip 2 moves, the pole piece strip 2 drives the roller mechanism 320 and the first roller 333 to rotate synchronously, so that the first roller 333 and the roller mechanism 320 rotate at the same linear speed, and the pressure roller clamping mechanism 330, the roller clamping mechanism 340 and the pole piece strip 2 move at the same linear speed, thereby making the contact surface between the roller mechanism 320, the first roller 333 and the pole piece strip 2 able to rotate at the same linear speed.

[0094] Reference Figure 2In some embodiments, the roller pressing mechanism 340 includes a second driving member 341, a first connecting member 342, and a second roller 343. The second driving member 341 is disposed on the support 332, the second driving member 341 is located at the left end of the support 332, the second driving member 341 has a second output end 3411, and the second driving member 341 can drive the second output end 3411 to move up and down in the vertical direction. The first connecting member 342 has a first connecting end 3421 and a second connecting end 3422, the first connecting end 3421 is located at the right end of the first connecting member 342, the second connecting end 3422 is located at the left end of the first connecting member 342, the first connecting end 3421 is rotatably connected to the support 332, the second connecting end 3422 is rotatably connected to the second roller 343, the first roller 333 is disposed on the first connecting end 3421, the second roller 343 is disposed at the second connecting end 3422, and the first roller 333 and the second roller 343 are fixedly connected to the first connecting member 342. The second roller 343 is provided with a punch 3431 on its wheel surface, and the punch 3431 can be pressed into the die 321. The second driving member 341 can drive the second roller 343 to move vertically downward. The wheel surface of the second roller 343 presses the inner side of the pole piece strip 2. The roller mechanism 320 supports the outer side of the pole piece strip 2. The punch 3431 moves downward to press the pole ear 3 into the die 321. When the pole piece strip 2 moves, the pole piece strip 2 drives the roller mechanism 320 and the first roller 3 33 rotates synchronously, so that the first roller 333 and the roller mechanism 320 rotate at the same linear speed, and the second roller 343 rotates coaxially with the first roller 333 through the first connecting member 342. Driven by the pole piece material strip 2, the first roller 333, the second roller 343 and the roller mechanism 320 rotate at the same linear speed, so that the pole piece material strip 2 does not stop during the tape walking process and can bend the pole ear 3, thereby eliminating the impact on the bending position of the pole ear 3, thereby achieving the purpose of not damaging the pole ear 3.

[0095] Reference Figure 3In other embodiments, the roller pressing mechanism 340 includes a second driving member 341, a first motor 344, a first connecting member 342, and a second roller 343. The second driving member 341 is disposed on the support 332, the second driving member 341 is located at the left end of the support 332, and the second driving member 341 has a second output end 3411, and the second driving member 341 can drive the second output end 3411 to move up and down in the vertical direction. The first motor 344 is arranged on the support 332, and the first motor 344 has a third output terminal 3441. The left end of the first connecting member 342 is fixedly connected to the third output terminal 3441, and the right end of the first connecting member 342 is rotatably connected to the second output terminal 3411. The second roller 343 is arranged on the first connecting member 342. The first motor 344 drives the second roller 343 to rotate through the first connecting member 342. A punch 3431 is arranged on the wheel surface of the second roller 343, and the punch 3431 can be pressed into the die 321. The second driving member 341 can drive the second roller 343 to move vertically downward. The second driving member 341 is used to drive the second roller 343 to press the pole ear 3. When the pole piece strip 2 moves, the pole piece strip 2 drives the roller mechanism 320 and the first roller 333 to rotate synchronously. The first motor 344 drives the second roller 343 and the pole piece strip 2 to rotate synchronously, so that the first roller 333, the second roller 343 and the roller mechanism 320 rotate at the same linear speed. The first motor 344 is used to drive the second roller 343, the pole piece strip 2, the roller mechanism 320 and the first roller 333 to move at the same linear speed, so that the second roller 343 can roll and bend the pole ear 3 between the punch 3431 and the die 321.

[0096] Reference Figure 4In other embodiments, the roller pressing mechanism 340 includes a second driving member 341, a first connecting member 342, a transmission member 345, and a second roller 343. The second driving member 341 is disposed on the support 332, the second driving member 341 is located at the left end of the support 332, and the second driving member 341 has a second output end 3411, and the second driving member 341 can drive the second output end 3411 to move up and down in the vertical direction. The right end of the first connecting member 342 is rotatably connected to the second output end 3411, the left end of the first connecting member 342 is rotatably connected to the support 332, the upper end of the transmission member 345 is connected to the first connecting member 342, and the lower end of the transmission member 345 is connected to the roller mechanism 320. The second roller 343 is arranged at the right end of the first connecting member 342, and a punch 3431 is arranged on the wheel surface of the second roller 343, and the punch 3431 can be pressed into the die 321, and the second driving member 341 can drive the second roller 343 to move vertically downward. When the pole piece material strip 2 moves, the pole piece material strip 2 drives the roller mechanism 320 to rotate, and the roller mechanism 320 drives the first roller 333 to rotate synchronously, and the second roller 343 rotates synchronously with the roller mechanism 320 through the transmission member 345, so that the first roller 333, the second roller 343 and the roller mechanism 320 rotate at the same linear speed, and the second driving member 341 drives the second roller 343 to press the pole ear 3 in the vertical downward direction, so that the second roller 343 can roll and bend the pole ear 3 located between the punch 3431 and the die 321, so that the pole piece material strip 2 can bend the pole ear 3 without stopping during the belt walking process, eliminate the impact on the bending position of the pole ear 3, and thus achieve the purpose of not damaging the pole ear 3.

[0097] It should be noted that, in some embodiments, the first driving member 331 and the second driving member 341 are both cylinders (not shown in the figure) or motors (not shown in the figure). It is understandable that the cylinder can quickly drive the output end and can provide sufficient downward pressure for the first roller 333 and the second roller 343, so that the first roller 333, the second roller 343 and the roller mechanism 320 can move at the same linear speed through the friction force with the pole piece strip 2. The motor can stably drive the output end and can provide stable downward pressure for the first roller 333 and the second roller 343.

[0098] Reference Figure 4In some embodiments, the transmission member 345 includes a first gear 3451 and a second gear 3452, the roller mechanism 320 includes a roller wheel 322 and a roller shaft 323, the first gear 3451 is set on the first connecting member 342, the first gear 3451 is fixedly connected to the left end of the first connecting member 342, the second gear 3452 is set on the roller shaft 323, the second gear 3452 is connected to the left end of the roller shaft 323, the first gear 3451 and the second gear 3452 are meshed and connected, so that the first roller 333 and the roller wheel 322 rotate synchronously. The right end of the roller shaft 323 is rotatably connected to the mounting base 310, the roller wheel 322 is arranged on the roller shaft 323, and the die 321 is arranged on the surface of the left end of the roller wheel 322. The first roller 333 can press the pole ear 3 on the surface of the right end of the roller wheel 322, and the second roller 343 can press the pole piece strip 2 on the surface of the roller wheel 322, so that the second roller 343, the roller wheel 322, the first roller 333 and the pole piece strip 2 move at the same linear speed.

[0099] Reference Figures 5 to 7 In some embodiments, the shapes of the male mold 3431 and the female mold 321 can be customized according to the shape of the tab 3, and the shapes of the male mold 3431, the female mold 321 and the tab 3 include a circle, an inverted triangle and an inverted trapezoid. It should be noted that the shapes of the male mold 3431, the female mold 321 and the tab 3 in the above examples can be a circle, an inverted triangle or an inverted trapezoid, just to better illustrate that the male mold 3431 and the female mold 321 have the characteristics of being customized according to the shape of the tab 3, rather than indicating or implying that the shapes of the male mold 3431, the female mold 321 and the tab 3 can only be a circle, an inverted triangle and an inverted trapezoid, and therefore cannot be understood as a limitation of the present invention.

[0100] In some embodiments, tensioning rollers 250 are provided on one or both sides of the pole tab bending device 300 along the conveying path of the pole sheet strip 2, which are used to tension the pole sheet strip 2 passing through the pole tab bending device 300 to prevent the pole sheet strip 2 from loosening and causing wrinkles, which would affect the bending of the pole tab 3 and the conveying of the pole sheet strip 2.

[0101] Figures 8 to 14 Schematic diagram of the tab smoothing mechanism in some embodiments is shown. Figures 8 to 11In some embodiments, the tab smoothing mechanism includes a bracket 120 and a first guide mechanism 130. The bracket 120 is connected to the frame. The bracket 120 is provided with a mounting portion. The first guide mechanism 130 includes a fixing member 131. The fixing member 131 is located at the protruding end of the tab 3 of the winding core 1 and is connected to the mounting portion. Along the circumference of the winding needle 110, the fixing member 131 includes a feeding end 132 and a discharging end 133. The tab 3 of the winding core 1 can enter between the fixing member 131 and the end of the winding core 1 from the feeding end 132 and move out from the discharging end 133 as the winding needle 110 rotates. The fixing member 131 is used to smooth the tab 3 of the winding core 1 toward the end of the winding core 1. Among them, the fixing part 131 has a guide surface 134 on the side facing the pole ear 3, thereby, a channel for the pole ear 3 to pass through is formed between the guide surface 134 and the end of the winding core 1 with the pole ear 3, and the pole ear 3 can move relative to the fixing part 131 as the winding core 1 is wound, so that it can enter the channel from the feed end 132 and move out of the channel from the discharge end 133.

[0102] Reference Fig.11 In some embodiments, the distance between the guide surface 134 and the end of the winding core 1 gradually decreases from the feed end 132 to the discharge end 133. Therefore, the guide surface 134 can gradually squeeze the pole ear 3 toward the end of the winding core 1 while the pole ear 3 moves in the channel until the pole ear 3 moves out from the discharge end 133. The pole ear 3 squeezed by the guide surface 134 can be bent toward the end surface of the winding core 1. Therefore, the guide surface 134 can smooth the pole ear 3 toward the end of the winding core 1 during winding, which can avoid the undesirable phenomena such as folding, wrinkling, and disorder of the pole ear 3 during winding, effectively avoid damage to the pole ear 3, and thus help improve the winding quality of the winding core 1. In addition, the pole ear smoothing mechanism can smooth the pole ear 3 of the winding core 1 while the pole piece is being wound. Therefore, when the winding of the winding core 1 is completed, the pole ear 3 at the end of the winding core 1 is also smoothed. The smoothed pole ear 3 is bent toward the winding needle 110 in an orderly manner, which is convenient for the flattening operation of the pole ear 3.

[0103] Reference Figure 8 and Fig. 9In the above embodiment, the guide surface 134 of the fixing member 131 can cover a part of the moving path of the pole tab 3, so that the pole tab 3 wound on the winding needle 110 can be gradually smoothed when passing the guide surface 134. It should be noted that the size of the fixing member 131 from the feed end 132 to the discharge end 133 can be reasonably configured based on the rotation speed of the winding needle 110, the degree of downward pressure of the pole tab 3, and the thickness of the winding core 1 to be wound, so as to ensure that the pole tab 3 can be gradually pressed down toward the end of the winding core 1 and smoothed in an appropriate movement distance, and avoid a large degree of compression of the pole tab 3 in an overly short movement distance. If the dimension of the fixing member 131 from the feed end 132 to the discharge end 133 is too short, the portion of the guide surface 134 covering the moving path of the pole lug 3 is too short, and the distance the pole lug 3 passes through the guide surface 134 during winding is too short. As a result, the degree of squeezing of the pole lug 3 per unit distance (i.e., the distance the pole lug 3 is squeezed toward the end of the winding core 1) is too large, and it is difficult to ensure the smoothing effect, and the pole lug 3 is easily damaged. In the tab smoothing mechanism of the present embodiment, the feed end 132 and the discharge end 133 of the fixing member 131 are respectively located on both sides of the winding needle 110, so that the channel between the guide surface 134 and the end of the winding core 1 extends to both sides of the circumference of the winding needle 110, ensuring that the channel has an appropriate length. Therefore, the tab 3 wound on the winding needle 110 enters the channel from the feed end 132 on one side of the winding needle 110, and is gradually squeezed toward the end of the winding core 1 by the guide surface 134 in the channel as the winding needle 110 rotates, and then moves out of the channel from the discharge end 133 on the other side of the winding needle 110, which can ensure the smoothing effect of the tab 3.

[0104] Reference Fig.12 In the above embodiment, the fixing member 131 is in a fan-shaped structure with the axis of the winding needle 110 as the central axis, which can adapt to the movement path of the pole ear 3 wound on the winding needle 110. A slot for inserting the winding needle 110 is provided on the inner side of the fixing member 131 to avoid interference. The outer radius of the fixing member 131 is not less than the maximum radius of the winding core 1 to be wound, so that the pole ear 3 from the inner side to the outer side of the winding core 1 can be smoothed during the entire winding process of the winding core 1.

[0105] Reference Fig. 9 and Fig.12In some embodiments of the tab smoothing mechanism, along the moving path of the tab 3, the thickness of the fixing member 131 gradually increases from the feed end 132 to the discharge end 133, wherein the fixing member 131 can be connected to the mounting portion of the bracket 120 through the side away from the guide surface 134, or connected to the mounting portion through a connecting member, that is, the first guide mechanism 130 can also include a connecting member, the connecting member is connected to the mounting portion and the side of the fixing member 131 away from the tab 3, therefore, the connection position of the connecting member can be reasonably set according to the position of the winding needle 110 and the thickness of the winding core 1 to be wound, so as to ensure that the guiding surface 134 of the fixing member 131 corresponds to the end of the winding core 1. The fixing member 131 can adopt a design similar to that of the Archimedean spiral to facilitate the processing of the fixing member 131. After assembly, due to the change in thickness, the side of the fixing member 131 facing the core 1 gradually approaches the end of the core 1 from the feed end 132 to the discharge end 133, that is, the distance between the surface of the fixing member 131 facing the core 1 and the end of the core 1 decreases from the feed end 132 along the movement path of the pole lug 3 to the discharge end 133, thereby forming the above-mentioned guide surface 134, and a channel with a size gradually decreasing along the extending direction of the pole lug 3 is formed between the guide surface 134 and the end of the core 1, so that the end surface of the pole lug 3 facing the core 1 can be gradually pressed down to achieve the smoothing of the pole lug 3.

[0106] Reference Figure 8 and Fig. 9In some embodiments, the tab smoothing mechanism further includes a second guide mechanism 140, which includes a movable member 141 and a drive assembly 146. The movable member 141 is arranged on one side of the winding needle 110 corresponding to the end of the winding core 1. The movable member 141 includes a connecting portion 142 and a guiding portion 143. The connecting portion 142 is connected to the mounting portion. The guiding portion 143 is located on one side of the feeding end 132. The guiding portion 143 can be connected between the winding core 1 wound on the winding needle 110 and the winding core 1 to be wound on the winding needle 110. The joint 150 of the rolled-in pole piece strip 2 is shielded between the pole lug 3 rolled on the winding needle 110 and the pole lug 3 on the pole piece strip 2 to be rolled, which can effectively avoid the mutual interference between the pole lug 3 of the winding core 1 rolled on the winding needle 110 and the pole lug 3 to be rolled. The driving component 146 is used to drive the movable part 141 to move relative to the fixed part 131, so that the guide part 143 remains located at the joint 150 of the winding core 1 rolled on the winding needle 110 and the pole piece strip 2 to be rolled. As the thickness of the winding core 1 gradually becomes thicker, the driving component 146 drives the movable part 141 to move relative to the fixed part 131 so that the guide part 143 remains shielded between the pole lug 3 rolled on the winding core 1 and the pole lug 3 to be rolled. As the winding core 1 is wound layer by layer, the shielding of the guide part 143 can ensure that the pole lug 3 on the winding core 1 and the pole lug 3 to be rolled do not interfere with each other during winding. During winding, each layer of the pole lugs 3 on the core 1 enters the channel between the guide surface 134 and the end of the core 1 from the feed end 132 of the fixing member 131. When the core 1 is wound until the pole lugs 3 are moved out from the discharge end 133 of the fixing member 131, the pole lugs 3 of the same layer on the core 1 are squeezed toward the end of the core 1 by the guide surface 134, so that each pole lug 3 and the end of the core 1 are at the same set angle, that is, the pole lugs 3 are bent at the same angle toward the winding needle 110, so that the pole lugs 3 of different layers do not interfere with each other, thereby avoiding collision between the pole lugs 3 of different layers, resulting in defects such as disorder and folding of the pole lugs 3, thereby ensuring orderly stratification of the pole lugs 3.

[0107] Reference Fig. 9 and Fig.13 In some embodiments, the guide portion 143 of the movable member 141 has a guide edge 144, which is parallel to the pole sheet strip 2 to be wound, and one end of the guide edge 144 is located at the joint 150. The guide edge 144 is used to support the pole ear 3 on the side of the pole ear 3 of the pole sheet strip 2 facing the winding needle 110. The guide edge 144 parallel to the pole sheet strip 2 can simultaneously support multiple pole ears 3 on the pole sheet strip 2, thereby separating the pole ears 3 on the pole sheet strip 2 from the pole ears 3 that have been wound on the winding needle 110, avoiding mutual collision and damage of the two parts of the pole ears 3 during the winding process.

[0108] Reference Fig. 9 and Fig.13In some embodiments, the guide portion 143 has a shielding surface 145 on one side of the end portion of the winding core 1, and the shielding surface 145 is located between the pole lug 3 of the winding core 1 and the pole lug 3 of the pole sheet strip 2 to be wound, and can shield the pole lug 3 on the winding core 1 to avoid interference. The shielding surface 145 can be an inclined surface or an arc surface, and gradually moves away from the end portion of the winding core 1 toward the direction of the outer pole lug 3, which can effectively avoid the pole lug 3 on the winding core 1 and avoid collision.

[0109] Reference Fig.14 During the winding process of the winding needle 110, there is a joint 150 between the outer layer of the winding core 1 wound on the winding needle 110 and the pole piece strip 2 to be wound, that is, the position where the pole piece strip 2 is wound into the winding core 1. As the winding continues, the thickness of the winding core 1 gradually increases, and the position of the joint 150 also changes continuously. Under the premise that the conveying path of the pole piece strip 2 remains unchanged, the joint 150 where the pole piece strip 2 is wound into the winding core 1 changes from the inner layer of the winding core 1 to the outer side along a set curved path. For the convenience of explanation, Fig.14 The diagram shows the joint 150 where the pole piece strip 2 is wound into the winding core 1 when the thickness of the winding core 1 is different, and a position variation curve 151 of the joint 150 is obtained by connecting each joint 150 with a curve.

[0110] Reference Figure 8 , Fig. 9 and Fig.14 In the pole ear smoothing mechanism of the embodiment of the present application, the driving component 146 may include a driving element and a connecting plate 147, the connecting plate 147 is connected to the mounting portion, the connecting plate 147 is provided with a guide groove 148, the connecting portion 142 of the movable member 141 is connected with a guide column 149, the guide column 149 is penetrated in the guide groove 148 and can move along the guide groove 148, the driving element is used to drive the connecting portion 142 to move, the guide groove 148 is used to limit the moving path of the guide column 149, and as driven by the driving element, the guide column 149 moves along the guide groove 148, which can drive the movable member 141 to move relative to the winding needle 110 according to the set path, and the guide portion 143 is maintained at the junction 150 between the winding core 1 and the pole sheet strip 2 to be wound, shielding between the pole ear 3 of the winding core 1 and the pole ear 3 on the pole sheet strip 2. Among them, the guide groove 148 has a first end and a second end, and the distance between the first end and the winding needle 110 is smaller than the distance between the second end and the winding needle 110. Therefore, the movement of the guide column 149 along the guide groove 148 can change the distance between the guide part 143 and the winding needle 110, that is, change the distance between the guide part 143 and the winding core 1 wound on the winding needle 110, so as to move the guide part 143 to the above-mentioned joint 150 accordingly as the winding core 1 becomes thicker.

[0111] Reference Figure 8 and Fig. 9In some embodiments, the guide groove 148 on the connecting plate 147 may be arc-shaped, and the concave arc side of the guide groove 148 faces away from the winding needle 110, so that when the guide column 149 moves along the guide groove 148, the guide portion 143 can be moved accordingly along the arc path, so that it can move accordingly with the position change of the above-mentioned joint 150. The curvature of the guide groove 148 can be set to be consistent with the curvature of the curve connected to the above-mentioned joint 150. At this time, it is only necessary to drive the movable member 141 to move along the guide groove 148 to ensure that one end of the guide portion 143 moves with the position change of the joint point. In addition, since the speed of winding the pole piece strip 2 is constant, the rate of change of the inclination angle of the pole piece strip 2 is also constant, and the guide edge 144 of the guide portion 143 can remain parallel to the pole piece strip 2 to be wound and can support the pole ear 3 of the pole piece strip 2.

[0112] A conventional linear motion mechanism can be used to drive the movable member 141 to move relative to the connecting plate 147 along the guide groove 148. For example, the conventional linear motion mechanism includes a synchronous belt mechanism, a gear rack mechanism, a screw module mechanism or a cylinder mechanism, etc. The driving assembly 146 of this embodiment includes a driving element, a gear 1461 and a rack 1462. The rack 1462 is fixedly connected to the movable member 141, and the gear 1461 is connected to the driving element. The gear 1461 meshes with the rack 1462 to form a gear rack mechanism. The driving element is used to drive the gear 1461 to rotate, so that the rack 1462 drives the movable member 141 to move. The mechanism is simple, reliable and easy to implement.

[0113] Fig.15 for Figure 1 Schematic diagram of the transport device in the embodiment, refer to Figure 1 and Fig.15 In some embodiments, after the winding of the core 1 is completed, the core 1 can be loaded and unloaded from the winding needle 110 to the tab flattening device 400 through the transport device 600. The transport device 600 includes a clamp 610, a clamp opening and closing mechanism 620, and a moving mechanism 630. The clamp opening and closing mechanism 620 drives the clamp 610 to open and close to take and put the core 1. The moving mechanism 630 is used to move the clamp 610 to transport the core 1 between the winding needle 110 and the carrier 411 of the tab flattening device 400.

[0114] Fig.16 for Figure 1 Schematic diagram of the tab flattening device in the embodiment, see Figure 1 , Fig.15 and Fig.16The bearing member 411 of the tab flattening device 400 can be used to carry a plurality of cores 1, and the pressing head 421 is correspondingly located at a set position of the bearing member 411. The bearing mechanism 410 further includes a conveying assembly 412, which is used to drive the bearing member 411 to move relative to the pressing head 421, so as to convey the core 1 to a position corresponding to the pressing head 421, so as to press the tab 3 of the core 1 accordingly. The bearing member 411 can be a conveyor belt, and the conveying assembly 412 is a conventional roller assembly for conveying the conveyor belt. The cores 1 are placed on the conveyor belt, and the cores 1 can be conveyed one by one to the position of the pressing head 421 through the conveying of the conveying assembly 412.

[0115] Typically, after the winding device 100 winds the positive electrode sheet material strip 2 and the negative electrode sheet material strip 2, the pole lugs 3 of the positive electrode sheet material strip 2 and the pole lugs 3 of the negative electrode sheet material strip 2 are respectively located at the two ends of the winding core 1, as the positive electrode lugs 3 and the negative electrode lugs 3. In some embodiments, the pressing mechanism 420 includes a pressing assembly and a pressing drive assembly 422, the pressing assembly includes a pressing bracket 423 and two pressing heads 421 arranged opposite to each other, the pressing bracket 423 is relatively fixed to the conveying assembly 412, and the pressing drive assembly 422 is connected to the pressing bracket 423. The two pressing heads 421 are respectively connected to the pressing drive assembly 422, and the pressing drive assembly 422 is used to drive the two pressing heads 421 to move toward each other; or, a slide rail is provided on the pressing bracket 423, and the two pressing heads 421 are respectively slidably connected to the slide rail, and the pressing drive assembly 422 is used to drive the two pressing heads 421 to move toward each other along the slide rail. The two pressing heads 421 moving toward each other can press the positive pole ear 3 and the negative pole ear 3 from both ends of the winding core 1, thereby realizing the flattening operation of the pole ear 3 of the winding core 1. After the pressing of the current winding core 1 is completed, the pressing drive component 422 drives the two pressing heads 421 to move away from each other, thereby avoiding the winding core 1 that has completed the flattening operation of the pole ear 3, and the conveying component 412 drives the carrier 411 to move, so as to transport the next winding core 1 to the pressing head 421 for flattening the pole ear 3, thereby realizing a continuous flattening operation. Among them, the pressing drive component 422 can use a conventional two-way cylinder, which can simultaneously drive the two pressing heads 421 to realize the above-mentioned movement toward or away from each other. Alternatively, the pressing drive component 422 can also use a conventional one-way cylinder, and the two pressing heads 421 can respectively realize the above-mentioned movement toward or away from each other through the extension and retraction of a one-way cylinder.

[0116] As can be seen from the above, since the tabs 3 are bent and flattened during the winding process, multiple layers of orderly tabs 3 bent toward the central axis of the core 1 are formed at both ends of the wound core 1, which facilitates the flattening of the tabs 3. The flattened tabs 3 can be attached to the ends of the core 1 toward the middle of the core 1 to prevent the tabs 3 from turning outward, thereby avoiding damage to the tabs 3 in subsequent processes (such as the process of putting the core 1 into the shell), which is beneficial to improving the quality of the battery cell.

[0117] The winding core 1 is usually formed by winding the positive electrode sheet and the negative electrode sheet, and a separator is provided between each layer of the electrode sheet. The electrode sheet strip 2 of the above embodiment may include a positive electrode sheet strip 2 and a negative electrode sheet strip 2. Figure 1 In some embodiments of the present invention, the conveying device 200 includes a positive electrode sheet conveying mechanism 210, a negative electrode sheet conveying mechanism 220, a first diaphragm conveying mechanism 230 and a second diaphragm conveying mechanism 240 connected to the frame. The positive electrode sheet conveying mechanism 210 is used to convey the positive electrode sheet material strip 2 to the winding needle 110, and the negative electrode sheet conveying mechanism 220 is used to convey the negative electrode sheet material strip 2 to the winding needle 110. The positive electrode tabs 3 on the positive electrode sheet material strip 2 and the negative electrode tabs 3 on the negative electrode sheet material strip 2 are respectively oriented in opposite directions along the axial direction of the winding needle 110, and the positive electrode tabs 3 and the negative electrode tabs 3 wound on the winding needle 110 are respectively oriented toward the two ends of the winding core 1. The first diaphragm conveying mechanism 230 is used to convey the diaphragm material strip 4 to the winding needle 110 between the positive electrode sheet material strip 2 and the negative electrode sheet material strip 2, and the second diaphragm conveying mechanism 240 is used to convey the diaphragm material strip 4 to the winding needle 110 between the electrode sheet material strip 2 and the winding needle 110. The positive electrode sheet conveying mechanism 210, the negative electrode sheet conveying mechanism 220, the first separator conveying mechanism 230 and the second separator conveying mechanism 240 can adopt conventional unwinding mechanisms, and the positive electrode sheet material strip 2, the negative electrode sheet material strip 2 and the separator material strip 4 are arranged in the unwinding mechanism as rolled materials, and unwinding can be performed by pulling out one end of the roll, and unwinding can be performed continuously by conveying toward the conveyor roller, or by winding and pulling the winding needle 110. The conveying device 200 can be provided with a roller on the conveying path between each conveying mechanism and the winding needle 110, so as to orderly distribute and convey each material strip.

[0118] Based on the above embodiment, the winding needle 110 is used to wind the positive electrode sheet material strip 2, the negative electrode sheet material strip 2 and the separator material strip 4 to form a winding core 1. The positive electrode sheet material strip 2 and the negative electrode sheet material strip 2 have an inner side and an outer side respectively. When winding, the inner side of the positive electrode sheet material strip 2 and the negative electrode sheet material strip 2 faces the winding needle 110. A tab bending device 300 is provided on the conveying path of the positive electrode sheet material strip 2, which is used to bend the positive electrode tab 3 toward the inner side of the positive electrode sheet material strip 2. A tab bending device 300 is also provided on the conveying path of the negative electrode sheet material strip 2, which is used to bend the negative electrode tab 3 toward the inner side of the negative electrode sheet material strip 2. The positions of the positive electrode sheet material strip 2 and the negative electrode sheet material strip 2 of the above embodiment can be swapped. The winding device 100 is provided with tab smoothing mechanisms corresponding to the two ends of the winding core 1, which are used to smooth the positive tab 3 and the negative tab 3 at both ends of the winding core 1 toward the end of the winding core 1. As a result, the positive electrode tab 3 and the negative electrode tab 3 can be bent and smoothed online to avoid damage.

[0119] As can be seen from the above, in the battery cell processing system of the embodiment of the present application, the pole piece strip 2 is conveyed by the conveying device 200, and the pole lug 3 of the pole piece strip 2 is bent inwardly by the pole lug bending device 300 on the conveying path of the pole piece strip 2, so that when the pole piece strip 2 is wound by the winding needle 110 at the winding device 100, the pole lug smoothing mechanism can smooth the pole lug 3 of the winding core 1 wound on the winding needle 110 to avoid damage to the pole lug 3, and in some embodiments, the pole lug 3 of the pole piece strip 2 to be wound can also be separated from the pole lug 3 of the winding core 1 to avoid interference, thereby facilitating the orderly stratification of the pole lug 3 on the winding core 1. In this way, the online bending and smoothing of the pole lug 3 is achieved when the pole piece is wound, which can effectively avoid damage to the pole lug 3 during the winding process, thereby helping to improve the processing efficiency and quality of the battery cell. In some embodiments, the tab 3 smoothing device can also separate the tabs 3 of the pole sheet strip 2 to be wound from the tabs 3 of the winding core 1 to avoid interference, thereby facilitating orderly layering of the tabs 3 on the winding core 1. After winding is completed, the smoothing process after the subsequent winding core 1 is unloaded and before the tabs 3 are flattened can be omitted.

[0120] Fig.17 FIG. 1 is a schematic diagram of the structure of a battery cell processing system according to an embodiment of the present invention. Fig.17 The third aspect of the present invention provides a battery cell processing system, including a laser cutting device 500, and the pole tab 3 shaping device of the second aspect of the present invention, wherein the laser cutting device 500 is arranged on the conveying path of the pole sheet material strip 2 between the conveying device 200 and the pole tab bending device 300, and is used to process the pole tab 3 on the pole sheet material strip 2. The battery cell processing system cuts the pole tab 3 online through the laser cutting device 500, and the pole tab 3 shaping device is used to bend the pole tab 3 before the material strip is wound, smooth the pole tab 3 during winding, and flatten the pole tab 3 after winding. Thus, the pole tab 3 cutting, online bending, shaping, winding and flattening can be completed without stopping the machine, which reduces the transfer process and helps to improve production efficiency.

[0121] Figures 18 to 25 A schematic diagram of a laser cutting device in some embodiments is shown, referring to Fig.18 and Fig.19 In some embodiments, the laser cutting device 500 includes a laser head 510, a feeding device 520, a cutting support plate 570 and a waste separation device 560. The feeding device 520 includes a feed roller 522 and a discharge roller 523 arranged at intervals. The cutting support plate 570 is arranged between the feed roller 522 and the discharge roller 523. The cutting support plate 570 is sequentially provided with a first negative pressure port 571, a second negative pressure port 572 and a third negative pressure port 573 along the conveying direction of the electrode strip 2. The laser head 510 can cut the strip passing through the second negative pressure port 572. The waste separation device 560 can separate the waste 22 (refer to Fig.25) is separated from the material strip, thereby enabling the pole lug 3 to be cut on the pole piece material strip 2.

[0122] Reference Fig.18 and Fig.19 In some embodiments, the laser cutting device 500 includes a laser head 510, a feeding device 520, a dust removal blade assembly 530, a front dust removal cover 540, a side dust removal cover 550, a waste separation device 560 and a cutting pallet 570. The feeding device 520 includes a frame 521, a feed roller 522 and a discharge roller 523. The feed roller 522 and the discharge roller 523 are both rotatably arranged on the frame 521. After the material belt is introduced from the feed roller 522, it is led out from the discharge roller 523 and is tensioned between the feed roller 522 and the discharge roller 523. The cutting pallet 570 is close to the right side of the material belt, the laser head 510 is arranged opposite to the cutting pallet 570, and the laser head 510 is located on the left side of the material belt. The laser head 510 can cut the material belt located at the cutting pallet 570. The front dust hood 540 is located on the same side as the laser head 510. The front dust hood 540 covers the cutting pallet 570, and the front dust hood 540 is connected to a first negative pressure air source (not shown), so as to perform front dust suction on the cutting pallet 570. The dust blade assembly 530 and the side dust hood 550 are respectively arranged on the left and right sides of the cutting pallet 570. The side dust hood 550 is connected to a second negative pressure air source (not shown). The airflow formed by the dust blade assembly 530 passes through the cutting pallet 570 and then blows toward the side dust hood 550. The dust blade assembly 530 and the side dust hood 550 cooperate to perform side dust removal on the cutting pallet 570. The waste separation device 560 is located on the left side of the material belt. The waste separation device 560 is used to separate the waste 22 (refer to Fig.25 )Separate.

[0123] Reference Fig.19 , Fig. 22 and Fig.23The first negative pressure port 571, the second negative pressure port 572 and the third negative pressure port 573 are arranged on the side of the cutting support plate 570 facing the material belt. The first negative pressure port 571, the second negative pressure port 572 and the third negative pressure port 573 are arranged in sequence along the forward direction of the material belt, wherein the cutting position of the laser head 510 is located in the area where the second negative pressure port 572 is located. In this embodiment, the first negative pressure port 571, the second negative pressure port 572 and the third negative pressure port 573 are arranged in sequence from top to bottom. The negative pressure of the first negative pressure port 571, the second negative pressure port 572 and the third negative pressure port 573 can be generated by a fan or a vacuum generator. Therefore, when the material belt just enters the area where the cutting plate 570 is located, the first negative pressure port 571 immediately adsorbs the material belt to prevent the material belt from floating before cutting; when the material belt is being cut, it is adsorbed and fixed by the second negative pressure port 572. At the same time, the second negative pressure port 572 also has the function of adsorbing dust; when the material belt is about to leave the area where the cutting plate 570 is located, it is adsorbed and fixed by the third negative pressure port 573 to prevent the material belt from being affected by the material collection action and shaking.

[0124] Reference Fig. 20 , Fig.21 and Fig.25 The waste separation device 560 includes a driving device 561, a driving roller 562, a belt 563 and a driven roller 564. The belt 563 is sleeved on the driving roller 562 and the driven roller 564. The driving device 561 can drive the driving roller 562 to rotate, thereby driving the belt 563 to circulate. The belt 563 is provided with through holes 5631 connecting the two sides thereof, and the through holes 5631 are distributed in an array on the belt 563. In this embodiment, the driving device 561 is a motor, and the motor is connected to the driving roller 562 through a coupling. The driven roller 564 is arranged between the third negative pressure port 573 and the discharging roller 523, and the belt 563 on one side is arranged between the fourth negative pressure port (not shown) and the material belt, so that when the material belt moves downward from the third negative pressure port 573, it will pass through the area where the fourth negative pressure port is located, and the negative pressure brought by the fourth negative pressure port passes through the through hole 5631, and the waste material 22 separated from the material belt after cutting is adsorbed and fixed on the belt 563, and the waste material 22 moves with the belt 563. When the waste material 22 on the belt 563 is separated from the area where the fourth negative pressure port is located, the waste material 22 falls off the belt 563, thereby achieving complete separation of the waste material 22. Fig.24 and Fig.25 The edge area 21 of the pole piece strip 2 is used for processing and forming the pole ear 3, and the rest is the waste material 22 that needs to be removed.

[0125] As can be seen from the above, the battery cell processing system of the embodiment of the present invention, through the conveying device 200, conveys the positive electrode sheet material strip 2, the negative electrode sheet material strip 2 and the separator to the winding device 100 for winding, and in the process of conveying the electrode sheet material strip 2, the online cutting and bending of the pole ear 3 are realized, and the pole ear 3 is smoothed during winding, and the pole ear 3 at the end of the winding core 1 can be flattened after the winding is completed. The material loading and unloading and transfer operations between the various processes in the conventional process are omitted, thereby optimizing the production process. As can be seen from the above, the orderly bending and smoothing of the pole ear 3 can keep the pole ear 3 bent toward the middle of the winding core 1, avoiding damage or disorder of the pole ear 3, so that the rotation speed of the winding needle 110 can be increased accordingly, thereby significantly improving the winding efficiency, which is beneficial to improving the battery cell production efficiency.

[0126] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A tab shaping device, characterized in that: include: frame; The winding device comprises a winding mechanism and a pole ear smoothing mechanism, wherein the winding mechanism comprises a winding needle and a winding needle driving assembly for driving the winding needle to rotate, the winding needle is used to wind the pole piece strip and the diaphragm strip to form a winding core, the pole piece strip has an inner side and an outer side, and when winding, the inner side of the pole piece strip faces the winding needle, the pole ear smoothing mechanism comprises a bracket and a first guide mechanism, the bracket is connected to the frame, the bracket is connected to the frame, the bracket is provided with a mounting portion, the first guide mechanism comprises a fixing member, the fixing member is located at the pole ear protruding end of the winding core and is connected to the mounting portion, along the circumference of the winding needle, the fixing member comprises a feeding end and a discharging end, the pole ear of the winding core can enter between the fixing member and the end of the winding core from the feeding end as the winding needle rotates, and move out from the discharging end, and the fixing member is used to smooth the pole ear of the winding core toward the end of the winding core; A conveying device, used for conveying the pole piece material strip and the diaphragm material strip to the winding needle respectively; A pole tab bending device is arranged on the conveying path of the pole sheet material strip, and the pole tab bending device includes a roller mechanism and a roller pressing mechanism. The roller mechanism is used to support the outer side of the pole sheet material strip and convey the pole sheet material strip. A die is provided at a position corresponding to the pole tab of the pole sheet material strip on the roller mechanism, and the opening of the die faces the inner side of the pole sheet material strip. The roller pressing mechanism corresponds to the position of the die and is used to roll and bend the pole tab on the die before the pole sheet material strip is rolled, so that the pole tab of the pole sheet material strip is bent toward the inner side of the pole sheet material strip; and, The tab flattening device includes a bearing mechanism and a pressing mechanism, wherein the bearing mechanism includes a bearing member, and the bearing member is used to bear the side of the winding core; the pressing mechanism includes a pressing head and a pressing drive assembly, wherein the pressing head corresponds to the end of the winding core, and the pressing drive assembly is used to drive the pressing head to move relative to the bearing member to approach the end of the winding core, and the pressing head can press the tab of the winding core toward the end of the winding core.

2. The terminal ear shaping device according to claim 1, characterized in that: The fixing member has a guide surface on one side of the end of the winding core, and the distance between the guide surface and the end of the winding core gradually decreases from the feeding end to the discharging end, and the guide surface is used to smooth the pole ear of the winding core toward the end of the winding core.

3. The terminal ear shaping device according to claim 1, characterized in that: The pole lug smoothing mechanism also includes a second guiding mechanism, which includes a movable part and a driving assembly, wherein the movable part is arranged on one side of the winding needle corresponding to the end of the winding core with the pole lug, and the movable part includes a connecting part and a guiding part, wherein the connecting part is connected to the mounting part, and the guiding part is located on one side of the feeding end, and can be shielded between the pole lug of the winding core and the pole lug of the pole sheet strip at the junction of the winding core and the pole sheet strip to be wound, and the driving assembly is used to drive the movable part to move relative to the fixed part until the guide part is located at the junction.

4. The terminal ear shaping device according to claim 3, characterized in that: The driving assembly includes a driving element and a connecting plate, wherein the connecting plate is connected to the mounting portion, the connecting plate is provided with a guide groove, the connecting portion is connected with a guide column, the guide column is passed through the guide groove and can move along the guide groove, the driving element is used to drive the connecting portion to move, and the guide groove is used to limit the moving path of the guide column.

5. The terminal ear shaping device according to claim 1, characterized in that: The pole ear bending device also includes a mounting base and a pressure roller clamping mechanism, wherein the pressure roller clamping mechanism and the over-rolling mechanism are both arranged on the mounting base, the pressure roller clamping mechanism is used to press the pole piece strip onto the over-rolling mechanism, and the roller clamping mechanism is arranged on the pressure roller clamping mechanism, and the over-rolling mechanism, the roller clamping mechanism and the pole piece strip can move at equal linear speeds.

6. The terminal ear shaping device according to claim 1, characterized in that: The carrier is used to carry multiple winding cores, and the pressing head is located corresponding to the set position of the carrier. The carrier mechanism also includes a conveying component, which is used to drive the carrier to move relative to the pressing head to convey the winding core to the position corresponding to the pressing head.

7. The terminal ear shaping device according to any one of claims 1 to 6, characterized in that: The conveying device comprises: A positive electrode sheet conveying mechanism, used for conveying the positive electrode sheet strip to the winding needle; A negative electrode sheet conveying mechanism is used to convey the negative electrode sheet material strip to the winding needle, the positive electrode lugs on the positive electrode sheet material strip and the negative electrode lugs on the negative electrode sheet material strip are respectively oriented in opposite directions along the axial direction of the winding needle, and the positive electrode lugs and negative electrode lugs wound on the winding needle are respectively oriented toward the two ends of the winding core; A first diaphragm conveying mechanism is used to convey the diaphragm material strip to the winding needle between the positive electrode sheet material strip and the negative electrode sheet material strip; and The second diaphragm conveying mechanism is used to convey the diaphragm material strip to the winding needle between the pole piece material strip and the winding needle.

8. The terminal ear shaping device according to claim 7, characterized in that: The winding needle is used to wind the positive electrode sheet material strip, the negative electrode sheet material strip and the separator sheet material strip to form a winding core, the positive electrode sheet material strip and the negative electrode sheet material strip respectively have an inner side and an outer side, and when winding, the inner sides of the positive electrode sheet material strip and the negative electrode sheet material strip face the winding needle; The winding device is provided with the tab smoothing mechanism at both ends of the winding core, respectively, for smoothing the positive tabs and negative tabs at both ends of the winding core toward the end of the winding core; The tab bending device is provided on the conveying path of the positive electrode sheet material strip, and is used to fold the positive electrode tab toward the inner side of the positive electrode sheet material strip; The tab bending device is also provided on the conveying path of the negative electrode sheet material strip, and is used to bend the negative electrode tab toward the inner side of the negative electrode sheet material strip.

9. A method for shaping a tab, characterized in that: The tab shaping device according to any one of claims 1 to 8, wherein the tab shaping method comprises the following steps: The pole piece strip is conveyed to the winding needle by a conveying device, and the winding needle is rotated to wind the pole piece strip to form a winding core; On the conveying path of the pole sheet material strip and before the pole sheet material strip is rolled, the pole ear of the pole sheet material strip is bent toward the inner side of the pole sheet material strip; During the winding process of the winding needle, the pole ear wound on the winding needle is smoothed toward the end of the winding core at the set position at the end of the winding core until the winding core is wound to the set thickness and the winding is stopped; The core wound to a set thickness is unloaded, and the tabs at the ends of the core are pressed flat toward the ends of the core.

10. The method for shaping the tab according to claim 9, characterized in that: During the winding process of the winding needle, at the junction of the pole sheet strip to be wound and the winding core wound on the winding needle, the pole ears of the pole sheet strip and the pole ears of the winding core are shielded to avoid interference between the pole ears of the pole sheet strip and the pole ears of the winding core during winding.

11. A battery core processing system, characterized in that: It comprises a laser cutting device and, as claimed in any one of claims 1 to 8, a pole lug shaping device, wherein the laser cutting device is arranged on the conveying path of the pole sheet strip between the conveying device and the pole lug bending device, and is used for processing the pole lugs on the pole sheet strip.

12. The battery core processing system according to claim 11, characterized in that: The laser cutting device includes a laser head, a feeding device, a cutting pallet and a waste separation device. The feeding device includes a feed roller and a discharge roller arranged at intervals. The cutting pallet is arranged between the feed roller and the discharge roller. The cutting pallet is provided with a first negative pressure port, a second negative pressure port and a third negative pressure port in sequence along the conveying direction of the electrode material strip. The laser head can cut the material strip passing through the second negative pressure port, and the waste separation device can separate the waste from the material strip after cutting and separation.

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