Laminating table and laminating machine

Abstract

The utility model provides a lamination table and a lamination machine, and relates to the technical field of batteries. The lamination table comprises a cutting mechanism and a plurality of sub-lamination tables; each sub-stacking table is provided with a bearing surface for bearing a composite material belt A; the plurality of sub-stacking tables share a material receiving station; the multiple sub-stacking tables are moved in the first direction, so that the multiple sub-stacking tables can be located at the material receiving station in turn; the cutting mechanism is configured to cut the part, located between every two adjacent sub-stacking tables, of the composite material belt A. The multiple sub-stacking tables are sequentially arranged in the first direction and can move in the first direction to be located on the material receiving station in turn, and therefore the composite material belt A borne by the next sub-stacking table located on the material receiving station can be guided through movement of the previous sub-stacking table located on the material receiving station. Thus, the position controllability of the composite material belt A borne by the sub-stacking table can be effectively guaranteed, additional material guiding operation is not needed, and therefore the stacking efficiency of the laminated electrode assembly can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a stacking stage and a stacking machine. Background Technology

[0002] Electrode assemblies are one of the core components of a battery. Based on their forming method, electrode assemblies are divided into wound electrode assemblies and stacked electrode assemblies. The main forming method for stacked electrode assemblies is as follows: first, a composite strip is formed using a forming device; then, a portion of the composite strip is folded in a Z-shape on a stacking table to form a folded body; finally, the folded body and the remaining portion of the composite strip are cut to form the stacked electrode assembly. The composite strip includes a separator and multiple negative and positive electrode sheets connected by the separator. Each negative electrode sheet, its corresponding positive electrode sheet, and the separator between them constitute a composite sheet. Multiple composite sheets are stacked sequentially on a stacking table.

[0003] Because after folding a portion of the composite strip on the stacking table to form a folded body, the folded body needs to be cut off from the rest of the composite strip. After cutting, the end of the composite strip needs to be guided back onto the stacking table, resulting in low stacking efficiency of the stacked electrode assembly. Utility Model Content

[0004] Embodiments of this application provide a stacking stage and a stacking machine, which can improve the stacking efficiency of stacked electrode assemblies.

[0005] In a first aspect, embodiments of this application provide a stacking table, which includes sub-stacking tables and a cutting mechanism; there are multiple sub-stacking tables arranged sequentially along a first direction, and each sub-stacking table has a bearing surface for bearing composite strip A; the multiple sub-stacking tables have a shared receiving station; moving the multiple sub-stacking tables along the first direction allows the multiple sub-stacking tables to take turns being located at the receiving station; the cutting mechanism is configured to cut the portion of composite strip A located between two adjacent sub-stacking tables.

[0006] In one embodiment, the sub-stacking platform includes a support plate and a lifting mechanism; the support plate has a support surface; the lifting mechanism is connected to the support plate and is used to adjust the height position of the support surface.

[0007] In one embodiment, the sub-stacking platform further includes a fixed baffle, which is fixed relative to the lifting mechanism, and the fixed baffles of two adjacent sub-stacking platforms along the first direction are arranged adjacent to each other; wherein, when the bearing plate is at its lowest position, the fixed baffle is at least partially located on the side of the bearing surface close to the composite strip A; when the bearing plate is at its highest position, the fixed baffle does not extend beyond the bearing surface.

[0008] In one embodiment, when the first direction is a straight line, the sub-stacking platforms located at the beginning and end positions of the first direction further include a synchronization baffle; for each sub-stacking platform located at the beginning and end positions of the first direction, the synchronization baffle is connected to the bearing plate and is at least partially located on the side of the bearing surface close to the composite strip A, and the synchronization baffle of the sub-stacking platform located at the beginning and end positions is disposed away from the adjacent sub-stacking platform.

[0009] In one embodiment, the cutting mechanism includes a cutter connected to the cutting blade and a second drive assembly, the second drive assembly driving the cutter to reciprocate along a second direction perpendicular to the bearing surface; wherein the cutter is configured to cut the portion of the composite strip A located between two adjacent sub-stacking platforms.

[0010] In one embodiment, the cutting mechanism further includes a pressure knife and a third drive assembly, the third drive assembly being connected to the pressure knife and the second drive assembly, the third drive assembly driving the pressure knife and the second drive assembly to reciprocate along a second direction; wherein the pressure knife is configured to press down on the composite material strip A located at the receiving station.

[0011] In one embodiment, the distance between the pressing knife and the adjacent edge of the bearing surface located at the receiving station is 2mm to 6mm.

[0012] In one embodiment, the stacking stage further includes a shifting drive component connected to a plurality of sub-stacking stages. The shifting drive component drives a sub-stacking stage located at the receiving station to move to one side of the receiving station, and simultaneously drives another sub-stacking stage to move to the receiving station.

[0013] In one embodiment, there are two cutting mechanisms. Along the first direction, the two cutting mechanisms are located on both sides of the receiving station, and along the feeding direction of the composite material strip A, the structures of the two cutting mechanisms are symmetrical to each other.

[0014] In one embodiment, there are two sub-stacking platforms. The two sub-stacking platforms can be moved back and forth along a first direction so that the two sub-stacking platforms are located at the receiving station in turn.

[0015] Secondly, embodiments of this application provide a stacking machine, which includes a forming device and the aforementioned stacking table; the forming device is used to form a composite strip A, the composite strip A including a plurality of composite sheets connected in sequence by diaphragms; wherein, the composite strip A output by the forming device moves toward the bearing surface along a second direction, the second direction being perpendicular to the bearing surface.

[0016] In one embodiment, the forming apparatus includes a first feeding mechanism, a diaphragm feeding mechanism, a first thermal bonding mechanism, a second feeding mechanism, and a second thermal bonding mechanism; the first feeding mechanism is used to provide a first electrode sheet; there are two diaphragm feeding mechanisms, which are configured to supply diaphragms to both sides of the first electrode sheet respectively; the first thermal bonding mechanism is used to heat at least one of the diaphragm and the first electrode sheet, and press the diaphragm and the first electrode sheet together to form a composite strip B; there are two second feeding mechanisms, which are configured to supply second electrode sheets to both sides of the composite strip B respectively, and the two second feeding mechanisms alternately feed materials sequentially; the second thermal bonding mechanism is used to heat at least one of the composite strip and the second electrode sheet, and press the second electrode sheet and the composite strip B together to form a composite strip A.

[0017] In one embodiment, the first thermal bonding mechanism includes a first heating component and a first pressure roller assembly. The first heating component is used to heat the first electrode sheet, and the first pressure roller assembly is used to press the diaphragm and the heated first electrode sheet together.

[0018] In one embodiment, the second thermal bonding mechanism includes a second heating component and a second pressure roller assembly. The second heating component is used to heat the second electrode sheet, and the second pressure roller assembly is used to press the composite material strip B with the heated second electrode sheet. There are two second heating components, which are respectively located near the outlets of the two second feeding mechanisms.

[0019] In one embodiment, the forming apparatus further includes a heating and heat preservation component, which is disposed between the second feeding mechanism and the second pressure roller assembly. The heating and heat preservation component is used to keep the second electrode sheet, which is in contact with and heated by the composite material strip B, warm.

[0020] In one embodiment, the heating method of the first thermal composite mechanism and / or the second thermal composite mechanism is any one of the following heating methods: electric heating, magnetic field heating, and heat exchange plate heating.

[0021] In one embodiment, the forming apparatus further includes a diaphragm sealing mechanism located between the outlet of the first thermal bonding mechanism and the second feeding mechanism. The diaphragm sealing mechanism is used to connect the portions of the two diaphragms located between two adjacent first electrodes.

[0022] In one embodiment, the forming apparatus further includes a correction device. The portion of the diaphragm located between two adjacent first electrodes is the interval portion. The correction device collects the position information of the interval portion relative to the working end of the diaphragm sealing mechanism and controls the conveying speed of the composite material belt A according to the position information.

[0023] In one embodiment, the correction device includes an image acquisition end for acquiring position information; wherein the image acquisition end is a CCD vision camera for acquiring position, and / or the distance between the image acquisition end and the working end of the diaphragm sealing mechanism is 1 to 3 center distances, the center distance being the center distance between two adjacent composite sheets when the composite strip A is in a flattened state.

[0024] In one embodiment, the first feeding mechanism includes a first unwinding assembly, a first electrode ear die-cutting assembly, and a first electrode sheet cutting assembly; the first unwinding assembly is used to mount a first electrode sheet roll, the first electrode ear die-cutting assembly is used to cut the empty foil area of ​​the first electrode sheet roll from the first unwinding assembly to form a first electrode ear; the first electrode sheet cutting assembly is used to cut the first electrode sheet roll after being cut by the first electrode ear die-cutting assembly to form a first electrode sheet; and / or, the second feeding mechanism includes a second unwinding assembly, a second electrode ear die-cutting assembly, a second electrode sheet cutting assembly, and a second sheet feeding device; the second unwinding assembly is used to mount a second electrode sheet roll, the second electrode ear die-cutting assembly is used to cut the empty foil area of ​​the second electrode sheet roll from the second unwinding assembly to form a second electrode ear; the second electrode sheet cutting assembly is used to cut the second electrode sheet roll after being cut by the second electrode ear die-cutting assembly to form a second electrode sheet; the second sheet feeding device sequentially feeds the second electrode sheet roll from the second unwinding assembly to the second electrode ear die-cutting assembly, the second electrode sheet cutting assembly, and the composite strip B.

[0025] In one embodiment, the stacking machine further includes a material guiding mechanism; the forming device transmits the composite material strip A in a direction parallel to the horizontal plane; the material guiding mechanism is located above the receiving station, and guides the composite material strip A from the forming device in a second direction to the bearing surface located at the receiving station and stacks it.

[0026] In one embodiment, the material guiding mechanism includes a plurality of drive roller groups, which are spaced apart along a second direction. Each drive roller group includes two drive rollers spaced apart along a first direction. The distance between the two drive rollers in each drive roller group is used to transmit the composite strip A. And / or, the material guiding mechanism has a first end facing the bearing surface, and the distance between the first end and the bearing surface is 1.5 to 2 center distances. The center distance is the center distance between two adjacent composite sheets when the composite strip A is in a flattened state.

[0027] In one embodiment, a first feeding mechanism is used to provide a negative electrode sheet; a second feeding mechanism is used to provide a positive electrode sheet.

[0028] The beneficial effects of the embodiments of this application are as follows:

[0029] In the embodiments of this application, by sequentially arranging multiple sub-stacking platforms along a first direction and moving them along the first direction, they can take turns being positioned at the receiving station. This allows the movement of the preceding sub-stacking platform 11 at the receiving station to guide the composite strip A carried by the subsequent sub-stacking platform. In this way, the positional controllability of the composite strip A carried by the sub-stacking platform can be effectively ensured, and no additional guiding operation is required, thereby improving the stacking efficiency of the stacked electrode assembly. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the stacking stage provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the stacking table receiving method provided in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the sub-stacking structure provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of another stacking table receiving method provided in an embodiment of this application;

[0035] Figure 5 yes Figure 4 The diagram shows the sub-stacking platform for switching material receiving on the stacking platform.

[0036] Figure 6 yes Figure 1 Enlarged view of point A in the middle;

[0037] Figure 7 This is a schematic diagram of another stacking stage provided in an embodiment of this application;

[0038] Figure 8 This is a schematic diagram of the stacking machine provided in an embodiment of this application;

[0039] Figure 9 This is a top view of the composite strip provided in an embodiment of this application;

[0040] Figure 10 This is a schematic diagram of the structure of the composite strip provided in an embodiment of this application;

[0041] Figure 11This is a schematic diagram showing the positional relationship between the image acquisition end and the working end of the diaphragm sealing machine provided in an embodiment of this application;

[0042] Figure 12 This is a schematic diagram showing the positional relationship between the material guiding mechanism and the bearing surface provided in an embodiment of this application;

[0043] Figure 13 This is a schematic diagram of the process of stacking composite strip A on a stacking machine provided in an embodiment of this application;

[0044] Figure 14 This is a schematic diagram of the first state of receiving material on the stacking table provided in an embodiment of this application;

[0045] Figure 15 This is a schematic diagram of the second state of the stacking table receiving provided in an embodiment of this application;

[0046] Figure 16 This is a schematic diagram of the third state of the stacking table receiving provided in an embodiment of this application;

[0047] Figure 17 This is a schematic diagram of the fourth state of the stacking table receiving provided in an embodiment of this application;

[0048] Figure 18 This is a schematic diagram of the fifth state of the stacking table receiving process provided in an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1-Stacking table;

[0051] 11-Sub-stacking platform; 111-Bearing surface; 112-Bearing plate; 113-Lifting mechanism; 114-Fixed baffle; 115-Synchronization baffle; 116-Assembly plate;

[0052] 12 - First sub-stacking platform; 13 - Second sub-stacking platform;

[0053] 14- Receiving station;

[0054] 15-Cutting mechanism; 151-Cutter; 152-Second drive assembly; 153-Third drive assembly; 154-Pressure blade;

[0055] 16-Transposition drive component;

[0056] 2-Stacking machine; 21-Forming device;

[0057] 22-First feeding mechanism; 221-First unwinding assembly; 222-First electrode ear die-cutting assembly; 223-First electrode sheet cutting assembly;

[0058] 23-Diaphragm feeding mechanism;

[0059] 24-First thermal bonding mechanism; 241-First heating assembly; 242-First pressure roller assembly;

[0060] 25-Second feeding mechanism; 251-Second unwinding assembly; 252-Second electrode ear die-cutting assembly; 253-Second electrode sheet cutting assembly; 254-Second sheet feeding device;

[0061] 26-Second thermal bonding mechanism; 261-Second heating assembly; 262-Second pressure roller assembly;

[0062] 27-Heating and heat preservation components;

[0063] 28-Diaphragm sealing mechanism; 281-Working end;

[0064] 29-Correction device; 291-Image acquisition terminal;

[0065] 300 - Material guiding mechanism; 301 - Drive roller group; 302 - Drive roller; 303 - First end;

[0066] 31-Production line inspection camera;

[0067] 10 - First electrode; 20 - Second electrode; 30 - Separator; 40 - Composite strip A; 400 - Composite sheet; 50 - Composite strip B; 60 - First electrode roll; 70 - Second electrode roll. Detailed Implementation

[0068] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application.

[0069] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings. "Multiple" means at least two. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0072] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the stacking stage 1 provided in an embodiment of this application. Figure 2 This is a schematic diagram of the receiving mechanism of the stacking table 1 provided in an embodiment of this application. An embodiment of this application provides a stacking table 1. The stacking table 1 includes sub-stacking tables 11 and a cutting mechanism 15. There are multiple sub-stacking tables 11. The multiple sub-stacking tables 11 are arranged sequentially along a first direction. Each sub-stacking table 11 has a bearing surface 111 for bearing the composite strip A40. The multiple sub-stacking tables 11 have a shared receiving station 14. Moving the multiple sub-stacking tables 11 along the first direction allows the multiple sub-stacking tables 11 to be positioned at the receiving station 14 in turn. The cutting mechanism 15 is configured to cut the portion of the composite strip A40 located between two adjacent sub-stacking tables 11.

[0073] It can be understood that the composite strip A40 includes multiple composite sheets 400, and each composite sheet 400 includes a separator 30, a negative electrode sheet, a separator 30, and a positive electrode sheet that are sequentially laminated. The separators 30 of two adjacent composite sheets 400 are interconnected.

[0074] It is understandable that the cutting mechanism 15 can be set on one side of the sub-stacking platform 11, or on one side of the receiving station, or it can be held in the hand by the operator.

[0075] It is understandable that, in order to reduce the difficulty of receiving materials, the bearing surface 111 is parallel to the horizontal plane, and the composite strip A40 can fall onto the bearing surface 111 under the action of gravity.

[0076] It is understandable that the movement of the sub-stacking platform 11 along the first direction can be achieved by a driving component or by manual operation.

[0077] It is understandable that one receiving station 14 can be configured, and the sub-stacking platform 11 located on one side of the receiving station 14 can be used as an unloading station.

[0078] It is understood that the number of sub-stacking platforms 11 can be two or more. When there are two sub-stacking platforms 11, the first direction is a straight line. Moving the two sub-stacking platforms 11 back and forth along the first direction allows the two sub-stacking platforms 11 to take turns being located at the receiving station 14 and the unloading station. When there are multiple sub-stacking platforms 11, the first direction can be a straight line. In this case, the sub-stacking platforms 11 can be moved sequentially along one direction, so that the multiple sub-stacking platforms 11 take turns being located at the receiving station 14. After all the sub-stacking platforms 11 have completed receiving, the sub-stacking platforms 11 are moved sequentially in the opposite direction, so that the multiple sub-stacking platforms 11 take turns being located at the receiving station 14 to receive materials again.

[0079] Furthermore, when there are multiple sub-stacking platforms 11, the first direction can also be a rotational direction, for example, clockwise or counterclockwise. In this case, the multiple sub-stacking platforms 11 can be arranged in a ring, so that each sub-stacking platform 11 moves sequentially in a clockwise or counterclockwise direction, allowing the multiple sub-stacking platforms 11 to take turns being located at the receiving station 14. Moreover, in order to accommodate the formation of the composite sheet 400, the movement trajectory of the sub-stacking platforms 11 at the receiving position is a straight line.

[0080] like Figure 2 As shown, during material receiving, when the number of composite sheets 400 carried by the sub-stacking platform 11 at the material receiving station 14 reaches a preset value, each sub-stacking platform 11 moves along the first direction so that the sub-stacking platform 11 carrying the preset value of composite sheets 400 is located at the unloading station, while another sub-stacking platform 11 is located at the material receiving station 14. As the sub-stacking platform 11 moves, the continuously conveyed composite sheets 400 automatically fall onto the next bearing surface 111 located at the material receiving station 14 for the next stacking operation of the stacked electrode assembly. Then, the portion of the composite strip A40 located between two adjacent sub-stacking platforms 11 is cut by the cutting mechanism 15, thereby unloading the composite sheets 400 located at the unloading station.

[0081] In this embodiment, by sequentially arranging multiple sub-stacking platforms 11 along a first direction and moving them along the first direction, they can take turns being positioned at the receiving station 14. This allows the movement of the preceding sub-stacking platform 11 at the receiving station 14 to guide the composite strip A40 carried by the subsequent sub-stacking platform 11. In this way, on the one hand, the positional controllability of the composite strip A40 carried by the sub-stacking platform 11 can be effectively ensured without requiring additional material guiding operations, thereby improving the stacking efficiency of the stacked electrode assembly; on the other hand, the alignment of the first and last composite sheets 400 of each stacked electrode assembly can be improved, thereby enhancing the stacking neatness of the electrode assemblies stacked on the stacking platform 1.

[0082] The material guiding operation refers to guiding the cut end of the composite strip A40 to a preset position on the bearing surface 111, so that the end of the composite strip A40 from the forming device can be folded in a Z-shape on the bearing surface 111 under the action of gravity in a preset folding direction to form a neat folded body.

[0083] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the sub-stacking platform 11 provided in an embodiment of this application. In one embodiment, the sub-stacking platform 11 includes a support plate 112 and a lifting mechanism 113. The support plate 112 has a support surface 111. The lifting mechanism 113 is connected to the support plate 112. The lifting mechanism 113 is used to adjust the height position of the support surface 111.

[0084] For example, the lifting mechanism 113 includes, but is not limited to, a linear motor, a pneumatic rod, a hydraulic rod, a worm gear assembly, a scissor telescopic assembly, a lead screw assembly, and a return spring.

[0085] It is understood that the drive end of the lifting mechanism 113 is connected to the support plate 112.

[0086] It is understood that the lifting mechanism 113 can be fixed to any structure other than the sub-stacking platform 11 and capable of moving with the sub-stacking platform 11 in the first direction.

[0087] It is understandable that as the composite sheet 400 is stacked on the bearing surface 111 located at the receiving station 14, the stacking height of the composite sheet 400 will continuously increase. If the height of the bearing surface 111 is not adjusted, the dropping position of the composite sheet 400 will continuously increase, resulting in a decrease in the smoothness of the subsequent composite sheet 400 falling into the sub-stacking platform 11.

[0088] Based on this, this embodiment provides a lifting mechanism 113 for adjusting the height of the bearing surface 111, such as... Figure 4 As shown, Figure 4This is a schematic diagram of another stacking table 1 receiving material according to an embodiment of this application. As the stacking height of the composite sheets 400 continuously increases, the height position of the support plate 112 is adjusted by the lifting mechanism 113 to continuously lower the height position of the support plate 112. When the support plate 112 is empty, it is at its highest position. Optionally, the height of the empty support surface 111 is consistent with the height of the top surface of the composite sheets 400 loaded with a preset number. When the support plate 112 is loaded with a preset number of composite sheets 400, its height position is at its lowest.

[0089] In this embodiment, by setting up a lifting mechanism 113 to adjust the height of the bearing surface 111, the height of the bearing surface 111 can be continuously reduced as the stacking height of the composite sheet 400 increases, so that the dropping position height of each composite sheet 400 is consistent, thereby improving the smoothness of the subsequent falling composite sheet 400 into the sub-stacking platform 11.

[0090] Furthermore, by setting up a lifting mechanism 113 to adjust the height of the bearing surface 111, the top surface of the stacked composite sheet 400 can be made to match the height of the bearing surface 111 of the next receiving sub-stacking platform 11 after it has borne one composite sheet 400. This not only improves the smoothness of the cutting mechanism 15 cutting the composite strip A40 between two adjacent sub-stacking platforms 11, but also improves the support of the bearing plate 112 at the receiving station 14 for the composite sheet 400, thereby improving the smoothness of cutting. Figure 5 As shown, Figure 5 yes Figure 4 The diagram shows the sub-stacking platform 11 for switching material receiving on the stacking platform 1.

[0091] Furthermore, by setting up a lifting mechanism 113 to adjust the height of the bearing surface 111, the top surface of the stacked composite sheet 400 can be made to match the height of the bearing surface 111 of the next receiving sub-stacking platform 11 after it has borne one composite sheet 400. This ensures that the composite sheet 400 on the next receiving sub-stacking platform 11 is in a horizontal position, resulting in a larger contact area between the composite sheet 400 and the corresponding bearing surface 111. Thus, after the composite strip A40 is cut at the point between two adjacent sub-stacking platforms 11, the composite sheet 400 on the next receiving sub-stacking platform 11 will not move. This improves the smoothness of guiding the composite strip A40 on the next receiving sub-stacking platform 11 from the movement of the previous receiving sub-stacking platform 11.

[0092] Please see Figure 3In one embodiment, the sub-stacking platform 11 further includes a fixed baffle 114. The fixed baffle 114 is fixed relative to the lifting mechanism 113. The fixed baffles 114 of two adjacent sub-stacking platforms 11 along a first direction are arranged adjacent to each other. When the support plate 112 is in its lowest position, the fixed baffle 114 is at least partially located on the side of the support surface 111 near the composite strip A40. When the support plate 112 is in its highest position, the fixed baffle 114 does not extend beyond the support surface 111.

[0093] It can be understood that the fixed baffle 114 is fixed relative to the lifting mechanism 113. Specifically, the fixed baffle 114, like the lifting mechanism 113, can move with the movement of the corresponding sub-platform 11, but does not move with the movement of the drive end of the lifting mechanism 113.

[0094] It is understood that the fixed baffle 114 can be fixed to any structure other than the sub-stacking platform 11 and capable of moving with the sub-stacking platform 11 in the first direction, such as the housing of the lifting mechanism 113.

[0095] It is understandable that as the stacking height of the composite sheet 400 increases, the height of the bearing plate 112 decreases, thereby causing the height dimension of the fixed baffle 114 on the side of the bearing surface 111 near the composite strip A40 to continuously increase, such as... Figure 4 and Figure 5 As shown. In this way, the stacked composite sheet 400 can be limited by the fixed baffle 114, so that the stacked composite sheet 400 can be prevented from moving relative to the support plate 112 due to inertia during the movement of the sub-stacking platform 11, thereby increasing the moving speed of the sub-stacking platform 11 and improving the stacking efficiency of the stacked electrode assembly.

[0096] Please see Figure 3 In one embodiment, when the first direction is a straight line, the sub-stacking platforms 11 located at the beginning and end positions of the first direction further include synchronization baffles 115. For each sub-stacking platform 11 located at the beginning and end positions of the first direction, the synchronization baffle 115 is connected to the support plate 112 and is at least partially located on the side of the support surface 111 near the composite strip A40. Specifically, the synchronization baffles 115 of the sub-stacking platforms 11 located at the beginning and end positions are positioned away from the adjacent sub-stacking platforms 11.

[0097] It is understandable that since one side of the first and last sub-stacking platforms 11 is provided with a sub-stacking platform 11 and the other side is empty, a synchronization baffle 115 can be provided on the side of the first and last sub-stacking platforms 11 where no sub-stacking platform 11 is provided without affecting the stacking of the composite sheet 400.

[0098] In this embodiment, by setting synchronous baffles 115 on the first and last sub-stacking platforms 11, the stacked composite sheets 400 can be limited by the synchronous baffles 115, and the synchronous baffles 115 can be directly fixed to the receiving plate without the need to design an additional sliding fit structure between the synchronous baffles 115 and the receiving plate, thereby reducing the design and manufacturing difficulty.

[0099] Please see Figure 1 or Figure 2 or Figure 4 or Figure 5 In one embodiment, the cutting mechanism 15 includes a cutter 151 and a second drive assembly 152 connected to each other. The second drive assembly 152 drives the cutter 151 to reciprocate along a second direction. The second direction is perpendicular to the bearing surface 111. The cutter 151 is configured to cut the portion of the composite strip A40 located between two adjacent sub-stacking platforms 11.

[0100] For example, the second drive assembly 152 includes, but is not limited to, a linear motor, a pneumatic rod, a hydraulic rod, a worm gear assembly, a scissor telescopic assembly, and a lead screw assembly.

[0101] It is understood that the drive end of the second drive component 152 is connected to the cutter 151.

[0102] It is understood that the second drive assembly 152 can be fixed on the sub-stacking platform 11, in which case a cutting mechanism 15 needs to be configured for each sub-stacking platform 11. The second drive assembly 152 can also be fixed on the frame to fix its position and can cut the composite strip A40 between each sub-stacking platform 11 located at the receiving station 14 and the sub-stacking platform 11 located on one side of the receiving station 14.

[0103] It is understood that the length of the cutting edge of the cutter 151 is not less than the dimension along the direction of the cutting edge at the position on the composite strip that needs to be cut. In this way, the composite strip A40 can be cut in one cut.

[0104] Please see Figure 1 or Figure 2 or Figure 4 or Figure 5 In one embodiment, the cutting mechanism 15 further includes a pressure knife 154 and a third drive assembly 153. The third drive assembly 153 is connected to the pressure knife 154 and the second drive assembly 152. The third drive assembly 153 drives the pressure knife 154 and the second drive assembly 152 to reciprocate along a second direction. The pressure knife 154 is configured to press down on the composite strip A40 located at the receiving station 14.

[0105] Specifically, the pressure knife 154 is configured to press down on the edge of the diaphragm 30 of the composite strip A40 located at the receiving station 14.

[0106] For example, the third drive assembly 153 includes, but is not limited to, a linear motor, a pneumatic rod, a hydraulic rod, a worm gear assembly, a scissor telescopic assembly, and a lead screw assembly.

[0107] It is understood that the drive end of the third drive component 153 is connected to the pressure knife 154 and the second drive component 152.

[0108] It is understood that the third drive assembly 153 can be fixed on the sub-stacking platform 11, in which case a cutting mechanism 15 needs to be configured for each sub-stacking platform 11. The third drive assembly 153 can also be fixed on the frame to fix its position and can cut the composite strip A40 between each sub-stacking platform 11 located at the receiving station 14 and the sub-stacking platform 11 located on one side of the receiving station 14.

[0109] It is understood that when cutting the portion of the composite strip A40 located between two adjacent sub-stacking platforms 11, the third drive assembly 153 is first activated so that the pressure blade 154 presses down on the composite strip A40. Specifically, the pressure blade 154 presses down on the diaphragm 30 located between two adjacent composite sheets 400. Then, the second drive assembly 152 is activated so that the pressure blade 154 moves downward, thereby cutting the portion of the composite strip A40 located between the two adjacent sub-stacking platforms 11.

[0110] In this embodiment, by setting the pressure knife 154, the stacked composite strips can be fixed when cutting the composite strip A40, thereby preventing the stacked composite sheets 400 from moving during the cutting process. In this way, the consistency of the position of the composite sheets 400 before and after cutting can be effectively guaranteed, thereby improving the neatness of the stacking of the composite sheets 400.

[0111] Please see Figure 6 , Figure 6 yes Figure 1 Enlarged view at point A. In one embodiment, the distance d1 between the pressure knife 154 and the adjacent edge of the bearing surface 111 is 2mm to 6mm.

[0112] It is understood that the distance d1 between the pressing knife 154 and the bearing surface 111 located at the receiving station 14 and its adjacent edge includes, but is not limited to, 2mm, 2.6mm, 3mm, 3.2mm, 3.8mm, 4mm, 4.5mm, 4.7mm, 4.9mm, 5mm, 5.2mm, 5.6mm, 5.8mm, and 6mm.

[0113] In this embodiment, by limiting the distance d1 between the pressing blade 154 and the edge adjacent to the bearing surface 111, damage to the current collector and active material layer of the positive and negative electrode sheets can be avoided during the cutting process of the pressing blade 154, thereby ensuring the quality of the stacked electrode assembly.

[0114] Please see Figure 1 or Figure 7 , Figure 7 This is a schematic diagram of another stacking stage provided in an embodiment of this application. In one embodiment, the stacking stage 1 further includes a transposition drive assembly 16. The transposition drive assembly 16 is connected to a plurality of sub-stacking stages 11. The transposition drive assembly 16 drives a sub-stacking stage 11 located at the receiving station 14 to move to one side of the receiving station 14, and simultaneously drives another sub-stacking stage 11 to move to the receiving station 14.

[0115] For example, the shift drive assembly 16 includes, but is not limited to, a linear motor, a pneumatic rod, a hydraulic rod, a worm gear assembly, a scissor telescopic assembly, and a lead screw assembly.

[0116] It is understandable that the drive end of the transposition drive component 16 is connected to the sub-stacking platform 11.

[0117] It is understandable that the transposition drive assembly 16 can be fixed to the rack or directly to the ground.

[0118] Specifically, the shifting drive assembly 16 is a lead screw assembly. The axis of the lead screw is parallel to the first direction. A drive nut is threaded onto the lead screw. The drive nut serves as the drive end of the shifting drive assembly 16. The lead screw rotates in the forward or reverse direction to drive the nut to move back and forth along the first direction, thereby driving the sub-stacking platform 11 to reciprocate along the first direction.

[0119] Specifically, the lifting mechanism 113 and the fixed baffle 114 are fixed to the drive end of the shift drive assembly 16.

[0120] In this embodiment, the sub-stacking platform 11 is driven to move along the first direction by the displacement driving component 16, which can reduce the labor intensity of workers and ensure the consistency of movement of each sub-stacking platform 11, so as to facilitate the smooth stacking of composite sheet 400.

[0121] In addition, such as Figure 7 As shown, in order to improve the overall integrity of each sub-stacking platform 11, an assembly plate 116 can be set between the sub-stacking platform 11 and the drive end of the transposition drive assembly 16, so that the sub-stacking platform 11 can be assembled on the assembly plate 116 and then fixed to the drive end of the transposition drive assembly 16 through the assembly plate 116, thereby improving the ease of assembly.

[0122] Please see Figure 1 or Figure 2 or Figure 4 or Figure 5In one embodiment, there are two cutting mechanisms 15. Along the first direction, the two cutting mechanisms 15 are located on both sides of the receiving station 14. And along the feeding direction of the composite strip A40, the structures of the two cutting mechanisms 15 are symmetrical to each other. In this way, the arrangement difficulty of the cutting mechanisms 15 can be reduced, and one of the waiting cutting mechanisms 15 can be maintained during the uninterrupted cutting of the composite strip A40, so as to improve the smoothness of the stacking of the composite sheet 400.

[0123] Please see Figure 1 or Figure 2 or Figure 4 or Figure 5 In one embodiment, there are two sub-stacking platforms 11. Moving the two sub-stacking platforms 11 back and forth along a first direction allows them to alternately occupy the receiving station 14. This reduces the number of sub-stacking platforms 11, satisfying the stacking requirements of the composite sheet 400 while also reducing the complexity of switching between them, thus improving the smoothness of the composite sheet 400 stacking process.

[0124] Please see Figure 8 , Figure 8 This is a schematic diagram of the stacking machine 2 provided in an embodiment of this application. Accordingly, an embodiment of this application provides a stacking machine 2. The stacking machine 2 includes a forming device 21 and the aforementioned stacking table 1. The forming device 21 is used to form a composite strip A40. The composite strip A40 includes a plurality of composite sheets 400 connected in sequence by diaphragms 30. The diaphragms 30 of two adjacent composite sheets 400 are connected to each other. The composite strip A40 output by the forming device 21 moves towards the bearing surface 111 along a second direction, which is perpendicular to the bearing surface 111.

[0125] In this embodiment, by employing the stacking stage 1 provided in some embodiments of this application, multiple sub-stacking stages 11 can be sequentially arranged along a first direction, and moved along the first direction to take turns being positioned at the receiving station 14. Thus, the movement of the preceding sub-stacking stage 11 at the receiving station 14 guides the composite strip A40 carried by the subsequent sub-stacking stage 11. This effectively ensures the positional controllability of the composite strip A40 carried by the sub-stacking stage 11, without requiring additional material guiding operations, thereby improving the stacking efficiency of the stacked electrode assembly.

[0126] Please see Figure 8In one embodiment, the molding apparatus 21 includes a first feeding mechanism 22, a diaphragm feeding mechanism 23, a first thermal bonding mechanism 24, a second feeding mechanism 25, and a second thermal bonding mechanism 26; the first feeding mechanism 22 is used to provide the first electrode 10; there are two diaphragm feeding mechanisms 23, which are respectively located on both sides of the first feeding mechanism 22, and the two diaphragm feeding mechanisms 23 are configured to supply diaphragms 30 to both sides of the first electrode 10 respectively; the first thermal bonding mechanism 24 is used to heat at least one of the diaphragm 30 and the first electrode 10. Heating is performed to press the diaphragm 30 and the first electrode 10 together to form a composite strip B50; there are two second feeding mechanisms 25, which are located on both sides of the first feeding mechanism 22 respectively. The two second feeding mechanisms 25 are configured to supply the second electrode 20 to both sides of the composite strip B50 respectively, and the two second feeding mechanisms 25 alternately feed materials in sequence; the second thermal composite mechanism 26 is used to heat at least one of the composite strip and the second electrode 20, and press the second electrode 20 together with the composite strip B50 to form a composite strip A40.

[0127] It is understood that the feeding speeds of the first feeding mechanism 22 and the second feeding mechanism 25 for conveying the first electrode 10 and the second electrode 20 can be adjusted, thereby allowing the spacing between two adjacent composite sheets 400 to adapt to different production needs. For example, when the first electrode 10 and the second electrode 20 conveyed by the first feeding mechanism 22 and the second feeding mechanism 25 belong to the same stacked electrode assembly, their feeding speed can be increased to make the spacing d2 between two adjacent composite sheets 400 smaller. Optionally, this spacing d2 is 1mm to 2mm, such as... Figure 9 As shown, Figure 9 This is a top view of the composite strip provided in an embodiment of this application.

[0128] When the first electrode 10 and the second electrode 20 fed by the first feeding mechanism 22 and the second feeding mechanism 25 belong to two stacked electrode assemblies respectively, the feeding speed can be reduced to make the distance d3 between the two stacked electrode assemblies larger, so as to facilitate the cutting mechanism 15 to cut smoothly. Optionally, the distance d3 is 0.3mm to 0.5mm. Figure 9 As shown.

[0129] Additionally, to avoid lithium plating, the number of negative electrode sheets in each electrode assembly can be greater than the number of positive electrode sheets. For example, negative electrode sheets and separator 30 can be composited in the head or tail composite stack of each electrode assembly, such as... Figure 10 As shown, Figure 10 This is a schematic diagram of the structure of the composite strip provided in an embodiment of this application.

[0130] Please see Figure 8In one embodiment, the first thermal bonding mechanism 24 includes a first heating component 241 and a first pressure roller assembly 242. The first heating component 241 is used to heat the first electrode 10. The first pressure roller assembly 242 is used to press the diaphragm 30 and the heated first electrode 10 together. In this embodiment, by heating the first electrode 10 to bond it to the diaphragm 30, the pores of the diaphragm 30 can be effectively prevented from becoming clogged, thus ensuring the air permeability of the diaphragm 30. On the other hand, heating the diaphragm 30 can prevent adhesive particles on its surface from sticking to the roller, thus reducing the cleaning difficulty of the first pressure roller assembly 242.

[0131] Furthermore, by eliminating the method of heating the diaphragm 30 through the first pressure roller assembly 242, the structural complexity of the first pressure roller can be reduced, thereby reducing the manufacturing cost of the stacking machine 2.

[0132] Optionally, the first pressure roller assembly 242 includes two opposing composite rollers. The two composite rollers press the first electrode 10 and the diaphragm 30 stacked together, thereby connecting the first electrode 10 and the diaphragm 30 into one unit.

[0133] The distance between the heating end of the first heating component 241 and the first electrode 10 can be 3mm to 5mm. The first heating component 241 can heat the first electrode 10 to 80℃ to 180℃. In this way, the first electrode 10 can both melt the diaphragm 30 to fuse the first electrode 10 and the diaphragm 30 into one unit, and also prevent the first electrode 10 from being damaged due to high temperature.

[0134] Please see Figure 8 In one embodiment, the second thermal bonding mechanism 26 includes a second heating component 261 and a second pressure roller assembly 262. The second heating component 261 is used to heat the second electrode 20. The second pressure roller assembly 262 is used to press the composite strip B50 together with the heated second electrode 20. There are two second heating components 261, each located adjacent to the outlet of one of the two second feeding mechanisms 25. In this embodiment, by heating the second electrode 20 to bond it to the composite strip B50, the vent holes of the diaphragm 30 can be effectively prevented from becoming blocked, thus ensuring the air permeability of the diaphragm 30. Furthermore, heating the diaphragm 30 can prevent adhesive particles on its surface from sticking to the roller, thereby reducing the cleaning difficulty of the second pressure roller assembly 262.

[0135] Optionally, the second pressure roller assembly 262 includes two opposing composite rollers. The two composite rollers press the stacked second electrode 20 and composite strip B50 together, thereby connecting the second electrode 20 and composite strip B50 into one unit.

[0136] Furthermore, by eliminating the method of heating the diaphragm 30 through the second pressure roller assembly 262, the structural complexity of the second pressure roller can be reduced, thereby reducing the manufacturing cost of the stacking machine 2.

[0137] The distance between the heating end of the second heating component 261 and the first electrode 10 can be 3mm to 5mm. The second heating component 261 can heat the second electrode 20 to 80℃ to 180℃. In this way, the second electrode 20 can both melt the diaphragm 30 to fuse the second electrode 20 with the diaphragm 30 into one piece, and avoid damage to the second electrode 20 due to high temperature.

[0138] In addition, compared to the method of heating the second electrode 20 by setting the two second heating components 261 at the contact point between the second electrode 20 and the composite material strip B50, setting the two second heating components 261 adjacent to the discharge ports of the two second feeding mechanisms 25 can not only reduce the arrangement length of the forming device 21 and reduce the floor space of the forming device 21, but also avoid the heating of the second electrode 20 from affecting the diaphragm 30, thereby effectively ensuring the air permeability of the diaphragm 30.

[0139] Please see Figure 8 In one embodiment, the forming apparatus 21 further includes a heating and heat preservation component 27. The heating and heat preservation component 27 is disposed between the second feeding mechanism 25 and the second pressure roller assembly 262. The heating and heat preservation component 27 is used to keep the second electrode 20, which is in contact with and heated by the composite strip B50, warm.

[0140] The heating temperature range of the heating and heat preservation component 27 is 40℃~80℃.

[0141] Optionally, the heating and heat preservation assembly 27 can be an oven. After the second electrode 20 comes into contact with the composite material belt B50, it enters the heating and heat preservation assembly 27 from one end and exits from the other end into the second pressure roller assembly 262.

[0142] It is understandable that, since the two second heating components 261 are respectively located near the discharge ports of the two second feeding mechanisms 25, the travel distance from when the second electrode 20 is heated to when it is laminated onto the composite strip B50 by the second pressure roller assembly 262 is relatively long, which can easily lead to a lower temperature when the second electrode 20 is laminated with the composite strip B50.

[0143] Based on this, in this embodiment, by setting the heating and heat preservation component 27, the second electrode 20 can be heated and kept warm to effectively ensure the composite temperature of the formed composite strip A40, so as to ensure the forming quality of the composite strip.

[0144] In one embodiment, the heating method of the first thermal composite mechanism 24 and / or the second thermal composite mechanism 26 is any one of the following heating methods: electric heating, magnetic field heating, and heat exchange plate heating.

[0145] Optionally, the heating method of the first thermal merging mechanism 24 and the second thermal merging mechanism 26 is electromagnetic heating. Electromagnetic heating is a heating method that uses the principle of electromagnetic induction to convert electrical energy into heat energy. During the electromagnetic heating process, the first thermal merging mechanism 24 and the second thermal merging mechanism 26 generate an alternating magnetic field through the components of the electronic circuit board. When the first pole piece 10 and the second pole piece 20 enter this magnetic field, the magnetic field lines generate alternating currents, i.e., eddy currents, at the current collectors of the first pole piece 10 and the second pole piece 20. The atoms in the eddy current current current collectors move at high speed and randomly, and the atoms collide and rub against each other to generate heat energy.

[0146] Electromagnetic heating reduces heat loss during transfer and allows the first electrode 10 and the second electrode 20 to reach higher temperatures in a shorter time, while also improving the precision of temperature control. This enhances the stacking efficiency of the stacked electrode assembly.

[0147] Please see Figure 8 In one embodiment, the forming apparatus 21 further includes a diaphragm sealing mechanism 28. The diaphragm sealing mechanism 28 is located between the outlet of the first thermal bonding mechanism 24 and the second feeding mechanism 25. The diaphragm sealing mechanism 28 is used to connect the portions of the two diaphragms 30 located between two adjacent first electrode sheets 10. Thus, after the composite strip A40 is cut, this sealing operation allows the cut portions of the diaphragms 30 to be joined together, effectively preventing the diaphragms 30 from flipping over, thereby improving the insulation between the positive and negative electrode sheets. This improves the quality of the stacked electrode assembly.

[0148] It is understandable that the extension direction of the hot-melt joint formed by the diaphragm sealing mechanism 28 on the diaphragm 30 is perpendicular to the transmission direction of the composite material strip.

[0149] Optionally, the working end 281 of the diaphragm 30 sealing machine is a cam mechanism. The cam mechanism rotates, causing its outer peripheral surface to contact the diaphragm 30. The cam mechanism is energized and heated, thereby thermally melting the diaphragm 30 so that the diaphragms 30 located on both sides of the electrode are connected to each other.

[0150] Optionally, the width w1 of the heat-fused joint formed by the diaphragm sealing mechanism 28 and the diaphragm 30 is 0.3mm to 0.5mm, such as... Figure 9 As shown.

[0151] Please see Figure 8In one embodiment, the forming apparatus 21 further includes a web guiding device 29. The portion of the diaphragm 30 located between two adjacent first electrode plates 10 is a gap portion. The web guiding device 29 collects the position information of the gap portion relative to the working end 281 of the diaphragm sealing mechanism 28, and controls the conveying speed of the composite material strip A40 according to the position information.

[0152] The correction device 29 includes an image acquisition end 291 for acquiring position information, and the image acquisition end is a CCD (Charge Coupled Device) vision camera for acquiring position.

[0153] It can be understood that the working end 281 refers to the component of the diaphragm 30 edge sealing machine used to connect the two layers of diaphragm 30 together. For example, the working end 281 of the cam-type diaphragm 30 edge sealing machine is a cam.

[0154] Optionally, there are two image acquisition terminals 291, which are located on both sides of the working end 281 of the diaphragm 30 edge sealing machine along the conveying direction of the composite material belt A40.

[0155] In this embodiment, by setting up the correction device 29, the position information of the interval part relative to the working end 281 of the diaphragm 30 edge sealing machine can be used to control the conveying speed of the composite material belt A40, thereby ensuring the control closed loop of the correction operation. This effectively ensures the correspondence between the interval part and the working section of the diaphragm 30 edge sealing machine, thus effectively ensuring the accuracy of the hot melt joint position.

[0156] Please see Figure 11 , Figure 11 This is a schematic diagram showing the positional relationship between the image acquisition end 291 and the working end 281 of the diaphragm 30 sealing machine according to an embodiment of this application. In one embodiment, the distance W2 between the image acquisition end 291 and the working end 281 of the diaphragm sealing mechanism 28 is 1 to 3 center-to-center distances. The center-to-center distance is the center-to-center distance between two adjacent composite sheets 400 when the composite strip A40 is in a flattened state.

[0157] It is understood that the distance W2 between the image acquisition end 291 and the working end 281 of the diaphragm sealing mechanism 28 includes, but is not limited to, 1 center-to-center distance, 1.5 center-to-center distance, 2 center-to-center distance, 2.2 center-to-center distance, 2.8 center-to-center distance, and 3 center-to-center distance.

[0158] In this embodiment, by limiting the distance as described above, on the one hand, the distance can be avoided from being too small, thereby providing sufficient adjustment time for the correction device 29 to control the conveying speed of the composite material belt A40 according to the position information; on the other hand, the distance can be avoided from being too large, thereby avoiding missing the position information of a certain partition relative to the working end 281 of the diaphragm 30 sealing machine.

[0159] In one embodiment, the first feeding mechanism 22 includes a first unwinding assembly 221, a first tab die-cutting assembly 222, and a first electrode cutting assembly 223. The first unwinding assembly 221 is used to mount a first electrode roll 60. The first tab die-cutting assembly 222 is used to cut the empty foil area of ​​the first electrode roll 60 from the first unwinding assembly 221 to form a first tab. The first electrode cutting assembly 223 is used to cut the first electrode roll 60 after being cut by the first tab die-cutting assembly 222 to form a first electrode 10. This makes the first feeding mechanism 22 simple and easy to manufacture.

[0160] The power source for the movement of the first electrode 10 from the first feeder to the contact with the diaphragm 30 can be the first feeder, the first heat load mechanism, or a feeding device, so as to send the first electrode roll 60 from the first unwinding assembly 221 between the two diaphragms 30.

[0161] Please see Figure 8 In some embodiments, the second feeding mechanism 25 includes a second unwinding assembly 251, a second electrode tab die-cutting assembly 252, a second electrode sheet cutting assembly 253, and a second sheet feeding device 254. The second unwinding assembly 251 is used to mount the second electrode sheet roll 70. The second electrode tab die-cutting assembly 252 is used to cut the empty foil area of ​​the second electrode sheet roll 70 from the second unwinding assembly 251 to form a second electrode tab. The second electrode sheet cutting assembly 253 is used to cut the second electrode sheet roll 70 after being cut by the second electrode tab die-cutting assembly 252 to form a second electrode sheet 20. The second sheet feeding device 254 feeds the second electrode sheet roll 70 from the second unwinding assembly 251 sequentially to the second electrode tab die-cutting assembly 252, the second electrode sheet cutting assembly 253, and the composite strip B50. This makes the second feeding mechanism 25 simple and easy to manufacture.

[0162] Please see Figure 8 In one embodiment, the stacking machine 2 further includes a guiding mechanism 300. The forming device 21 conveys the composite strip A40 in a direction parallel to the horizontal plane. The guiding mechanism 300 is located above the receiving station 14. The guiding mechanism 300 guides the composite strip A40 from the forming device 21 along a second direction to the bearing surface 111 located at the receiving station 14.

[0163] It is understandable that when the composite strip A40 is guided along the second direction to the bearing surface 111 of the receiving station 14, the composite strip A40 can be moved by gravity, thereby reducing power consumption and reducing the difficulty of stacking the composite sheet 400 on the bearing surface 111.

[0164] However, if the forming device 21 is fed along the second direction, the height of the forming device 21 will be relatively large. This will not only make the arrangement of the forming device 21 more difficult, but also make maintenance less convenient.

[0165] Therefore, in this embodiment, the forming device 21 transports the composite strip A40 in a direction parallel to the horizontal plane, and a guiding mechanism 300 is provided in the forming device 21 and the stacking table 1 to guide the composite strip A40 along the second direction to the bearing surface 111 of the receiving station 14. In this way, not only can the height of the forming device 21 be reduced, thereby reducing its layout difficulty and improving maintenance convenience, but also when the composite strip A40 is guided along the second direction to the bearing surface 111 of the receiving station 14, power consumption can be reduced, and the smoothness of the stacking of the composite sheet 400 on the bearing surface 111 can be improved.

[0166] Please see Figure 8 In one embodiment, the material guiding mechanism 300 includes a plurality of drive roller groups 301. The plurality of drive roller groups 301 are spaced apart along a second direction. Each drive roller group 301 includes two drive rollers 302 spaced apart along a first direction. The spacing between the two drive rollers 302 in each drive roller group 301 is used to transport the composite material strip A40. In this way, the stability of the transport of the composite material strip A40 can be improved.

[0167] Optionally, the material guiding mechanism 300 includes two drive roller groups 301.

[0168] Please refer to the following: Figure 12 , Figure 12 This is a schematic diagram showing the positional relationship between the material guiding mechanism 300 and the bearing surface 111 provided in an embodiment of this application. In one embodiment, the material guiding mechanism 300 has a first end 303 facing the bearing surface 111, and the distance W3 between the first end 303 and the bearing surface 111 is 1.5 to 2 center-to-center distances. The center-to-center distance is the center-to-center distance between two adjacent composite sheet 400 when the composite strip A40 is in a flattened state.

[0169] It is understood that the distance W3 between the end of the material guiding mechanism 300 facing the bearing surface 111 and the bearing surface 111 is including but not limited to 1.5 center-to-center distances, 1.6 center-to-center distances, 1.7 center-to-center distances, 1.8 center-to-center distances, and 2 center-to-center distances.

[0170] In this embodiment, by limiting the distance W3 between the end of the guiding mechanism 300 facing the bearing surface 111 and the bearing surface 111, both insufficient dropping height of the composite sheet 400 and excessive dropping height of the composite sheet 400, which would cause it to deviate from the preset dropping position, can be avoided. In this way, the neatness of the stacking of the composite sheets 400 can be improved.

[0171] In one embodiment, the first feeding mechanism 22 is used to provide the negative electrode sheet. The second feeding mechanism 25 is used to provide the positive electrode sheet.

[0172] It is understandable that the active material layer of the positive electrode uses an oil-based binder, resulting in a relatively smooth surface that facilitates thermal bonding with the separator 30. The active material layer of the negative electrode uses a water-based binder, and the negative electrode is primarily composed of layered graphite; therefore, the peel force between its active material and the foil is lower than that of the positive electrode. Consequently, the peel force between the negative electrode and the separator 30 is significantly lower than that between the positive electrode and the separator 30.

[0173] Based on this, in this embodiment, the negative electrode sheet is first composited with the upper and lower separators 30, and then the negative electrode sheet is composited with the upper and lower separators 30 again based on the hot-melt connection between the positive electrode sheet and the separator 30. This can improve the reliability of the connection between the negative electrode sheet and the separator 30.

[0174] In one embodiment, the stacking machine 2 further includes a feed line detection camera 31. The feed line detection camera 31 detects whether the positive and negative tabs of the composite strip A40 are folded. If folded, an alarm is activated to alert the relevant operators to take action.

[0175] Please see Figure 13 , Figure 13 This is a schematic diagram illustrating the process of stacking composite strips A40 on a stacking machine 2 according to an embodiment of this application. Based on the above embodiment, the process of stacking composite strips A40 on a stacking table 1 according to this application will be described in detail. The composite strip A40 includes a plurality of composite sheets 400 connected sequentially by diaphragms 30.

[0176] The process of stacking composite strip A40 on stacking table 1 includes:

[0177] S100, the composite strip A40 is conveyed to the bearing surface 111 of the sub-stacking platform 11 located at the receiving station 14, and two adjacent composite sheets 400 are stacked in sequence along a direction perpendicular to the bearing surface 111.

[0178] S200: When the number of composite sheets 400 stacked on the sub-stacking platform 11 located at the receiving station 14 reaches a preset value, multiple sub-stacking platforms 11 are moved along the first direction so that the sub-stacking platform 11 on which the number of composite sheets 400 carried by the bearing surface 111 reaches the preset value is located on one side of the receiving station, while another sub-stacking platform 11 is located at the receiving station 14.

[0179] S300, when at least one composite sheet 400 falls onto the bearing surface 111 of the sub-stacking platform 11 located at the receiving station 14, the portion of the diaphragm 30 located between two adjacent sub-stacking platforms 11 is cut by the cutting mechanism 15.

[0180] The following describes the process of stacking composite strip A40 on stacking table 1, taking stacking table 1 including two sub-stacks 11 as an example. For ease of description, the two sub-stacks 11 are referred to as the first sub-stack 12 and the second sub-stack 13.

[0181] Please see Figures 14-17 The process of stacking composite strip A40 includes:

[0182] The composite strip A40 is conveyed to the bearing surface 111 of the first sub-stacking platform 12 located at the receiving station 14, and adjacent composite sheets 400 are stacked sequentially in a direction perpendicular to the bearing surface 111, as follows. Figure 14 As shown;

[0183] When the number of composite sheet 400 stacked on the first sub-stacking platform 12 at the receiving station 14 reaches a preset value n (n is a positive integer and n≥1) sheets, two sub-stacking platforms 11 are moved along the first direction, so that the first sub-stacking platform 12 is located on one side of the receiving station 14, while the second sub-stacking platform 13 is located at the receiving station 14; at this time, the (n+1)th composite sheet 400 falls onto the bearing surface 111 of the second sub-stacking platform 13 after the movement of the first sub-stacking platform 12. Figure 15 As shown, as the composite sheet 400 continuously falls into the first sub-stacking platform 12, the lifting mechanism 113 of the first sub-stacking platform 12 drives the support plate 112 of the first sub-stacking platform 12 to continuously descend, so that the falling height of the composite sheet 400 from the guiding mechanism 300 is consistent.

[0184] When at least one composite sheet 400 is located on the bearing surface 111 of the second stacking platform 1, the portion of the diaphragm 30 located between the first sub-stacking platform 12 and the second sub-stacking platform 13 is cut by the cutting mechanism 15, such as... Figure 16 As shown.

[0185] It is understandable that after the portion of the diaphragm 30 located between the first sub-stacking platform 12 and the second sub-stacking platform 13 is cut, the composite sheet 400 stacked on the first sub-stacking platform 12 is transferred to the next station; simultaneously, the composite sheet 400 continues to be stacked on the second sub-stacking platform 13, as follows. Figure 17 As shown. When the number of composite sheets 400 stacked on the second sub-stacking platform 13 reaches a preset value n, the two sub-stacking platforms 11 are moved simultaneously in opposite directions, so that the second sub-stacking platform 13 is located on one side of the receiving station 14, and the (2n+1)th composite sheet 400 falls onto the bearing surface 111 of the first sub-stacking platform 12 as the second sub-stacking platform 13 moves. At this time, the first sub-stacking platform 12 is located at the receiving station 14 to receive the material, as shown. Figure 18As shown, as the composite sheet 400 continuously falls into the second sub-stacking platform 13, the lifting mechanism 113 of the second sub-stacking platform 13 drives the support plate 112 of the second sub-stacking platform 13 to continuously descend, so that the falling height of the composite sheet 400 from the guiding mechanism 300 is consistent.

[0186] Next, the portion of the diaphragm 30 located between the first sub-staple 12 and the second sub-staple 13 is cut off by the cutting mechanism 15.

[0187] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A stacking stage, characterized in that, include: Multiple sub-stacking platforms are arranged sequentially along a first direction. Each sub-stacking platform has a bearing surface for bearing composite material strip A. The multiple sub-stacking platforms have a shared receiving station. Moving the multiple sub-stacking platforms along the first direction allows the multiple sub-stacking platforms to take turns being located at the receiving station. A cutting mechanism configured to cut the portion of the composite strip A located between two adjacent sub-stacking platforms.

2. The stacking stage according to claim 1, characterized in that, The sub-stacking platform includes: The support plate has the aforementioned support surface; A lifting mechanism is connected to the support plate, and the lifting mechanism is used to adjust the height position of the support surface.

3. The stacking stage according to claim 2, characterized in that, The sub-stacking platform also includes a fixed baffle, which is fixed relative to the lifting mechanism. The fixed baffles of two adjacent sub-stacking platforms along the first direction are arranged adjacent to each other. Specifically, when the bearing plate is at its lowest position, the fixed baffle is at least partially located on the side of the bearing surface closest to the composite strip A; when the bearing plate is at its highest position, the fixed baffle does not extend beyond the bearing surface.

4. The stacking stage according to claim 3, characterized in that, When the first direction is a straight line, the sub-stacking platform located at the beginning and end of the first direction further includes a synchronization baffle. For each of the sub-stacking platforms located at the beginning and end of the first direction, the synchronization baffle is connected to the bearing plate and is located at least partially on the side of the bearing surface close to the composite strip A. The synchronization baffle of the sub-stacking platform located at the beginning and end is disposed away from the adjacent sub-stacking platform.

5. The stacking stage according to any one of claims 1-4, characterized in that, The cutting mechanism includes a cutter connected to the cutting blade and a second driving component. The second driving component drives the cutter to reciprocate along a second direction, which is perpendicular to the bearing surface. The cutter is configured to cut the portion of the composite strip A located between two adjacent sub-stacking platforms.

6. The stacking stage according to claim 5, characterized in that, The cutting mechanism further includes a pressure knife and a third drive assembly. The third drive assembly is connected to the pressure knife and the second drive assembly, and drives the pressure knife and the second drive assembly to reciprocate along the second direction. The pressing knife is configured to press down on the composite material strip A located at the receiving station.

7. The stacking stage according to claim 6, characterized in that, The distance between the pressing knife and the adjacent edge of the bearing surface located at the receiving station is 2mm to 6mm.

8. The stacking stage according to any one of claims 1-4, characterized in that, The stacking stage also includes a shifting drive assembly, which is connected to multiple sub-stacking stages. The shifting drive assembly drives one of the sub-stacking stages located at the receiving station to move to one side of the receiving station, and simultaneously drives another sub-stacking stage to move to the receiving station.

9. The stacking stage according to any one of claims 1-4, characterized in that, There are two cutting mechanisms. Along the first direction, the two cutting mechanisms are located on both sides of the receiving station, and along the feeding direction of the composite material strip A, the structures of the two cutting mechanisms are symmetrical to each other.

10. The stacking stage according to any one of claims 1-4, characterized in that, There are two sub-stacking platforms. The two sub-stacking platforms can be moved back and forth along the first direction so that the two sub-stacking platforms are located at the receiving station in turn.

11. A stacking machine, characterized in that, include: A forming device is used to form the composite strip A, wherein the composite strip A comprises a plurality of composite sheets connected in sequence by diaphragms; And, the stacking stage as described in any one of claims 1-10; The composite strip A output by the forming device moves toward the bearing surface along a second direction, which is perpendicular to the bearing surface.

12. The stacking machine according to claim 11, characterized in that, The molding apparatus includes: The first feeding mechanism is used to supply the first electrode sheet; Two diaphragm feeding mechanisms are configured to supply diaphragms to both sides of the first electrode, respectively; A first thermal bonding mechanism is used to heat at least one of the diaphragm and the first electrode, and to press the diaphragm and the first electrode together to form a composite strip B; Two second feeding mechanisms are configured to supply second electrode sheets to both sides of the composite strip B respectively, and the two second feeding mechanisms alternately feed materials in sequence; The second thermal bonding mechanism is used to heat at least one of the composite strip and the second electrode, and to press the second electrode with the composite strip B to form the composite strip A.

13. The stacking machine according to claim 12, characterized in that, The first thermal bonding mechanism includes a first heating component and a first pressure roller assembly. The first heating component is used to heat the first electrode sheet, and the first pressure roller assembly is used to press the diaphragm and the heated first electrode sheet together.

14. The stacking machine according to claim 12, characterized in that, The second thermal bonding mechanism includes a second heating component and a second pressure roller assembly. The second heating component is used to heat the second electrode sheet, and the second pressure roller assembly is used to press the composite strip B with the heated second electrode sheet. There are two second heating components, which are respectively located near the discharge ports of the two second feeding mechanisms.

15. The stacking machine according to claim 14, characterized in that, The forming device further includes a heating and heat preservation component, which is disposed between the second feeding mechanism and the second pressure roller assembly. The heating and heat preservation component is used to keep the second electrode sheet, which is in contact with and heated by the composite strip B, warm.

16. The stacking machine according to any one of claims 12-15, characterized in that, The heating method of the first thermal composite mechanism and / or the second thermal composite mechanism is any one of the following heating methods: electric heating, magnetic field heating, and heat exchange plate heating.

17. The stacking machine according to any one of claims 12-15, characterized in that, The forming device further includes a diaphragm sealing mechanism, which is located between the outlet of the first thermal bonding mechanism and the second feeding mechanism. The diaphragm sealing mechanism is used to connect the portions of the two diaphragms located between two adjacent first electrodes.

18. The stacking machine according to claim 17, characterized in that, The forming device also includes a correction device. The portion of the diaphragm located between two adjacent first electrodes is a gap portion. The correction device collects the position information of the gap portion relative to the working end of the diaphragm sealing mechanism and controls the conveying speed of the composite material belt A according to the position information.

19. The stacking machine according to claim 18, characterized in that, The correction device includes an image acquisition terminal for acquiring the location information; Wherein, the image acquisition end is a CCD vision camera, and / or, the distance between the image acquisition end and the working end of the diaphragm sealing mechanism is 1 to 3 center distances, wherein the center distance is the center distance between two adjacent composite sheets when the composite strip A is in a flattened state.

20. The stacking machine according to any one of claims 12-15, characterized in that, The first feeding mechanism includes a first unwinding assembly, a first electrode tab die-cutting assembly, and a first electrode sheet cutting assembly; the first unwinding assembly is used to mount the first electrode sheet roll, and the first electrode tab die-cutting assembly is used to cut the empty foil area of ​​the first electrode sheet roll from the first unwinding assembly to form the first electrode tab; The first electrode cutting assembly is used to cut the first electrode roll after it has been cut by the first electrode tab die-cutting assembly to form the first electrode; And / or, The second feeding mechanism includes a second unwinding assembly, a second electrode ear die-cutting assembly, a second electrode sheet cutting assembly, and a second sheet feeding device; the second unwinding assembly is used to mount the second electrode sheet roll, and the second electrode ear die-cutting assembly is used to cut the empty foil area of ​​the second electrode sheet roll from the second unwinding assembly to form the second electrode ear; The second electrode cutting assembly is used to cut the second electrode after it has been cut by the second electrode die-cutting assembly to form the second electrode. The second feeding device sequentially delivers the second electrode roll from the second unwinding assembly to the second electrode ear die-cutting assembly, the second electrode cutting assembly, and the composite strip B.

21. The stacking machine according to any one of claims 11-15, characterized in that, The stacking machine also includes a material guiding mechanism; the forming device transmits the composite material strip A in a direction parallel to the horizontal plane; the material guiding mechanism is located above the receiving station, and along the second direction, the material guiding mechanism guides the composite material strip A from the forming device to the bearing surface located at the receiving station and stacks it.

22. The stacking machine according to claim 21, characterized in that, The material guiding mechanism includes multiple drive roller groups, which are spaced apart along the second direction. Each drive roller group includes two drive rollers spaced apart along the first direction. The distance between the two drive rollers in each drive roller group is used to transmit the composite material belt A. And / or, The material guiding mechanism has a first end facing the bearing surface located at the receiving station. The distance between the first end and the bearing surface is 1.5 to 2 center-to-center distances. The center-to-center distance is the center-to-center distance between two adjacent composite sheets when the composite strip A is in a flattened state.

23. The stacking machine according to any one of claims 12-15, characterized in that, The first feeding mechanism is used to provide the negative electrode sheet; the second feeding mechanism is used to provide the positive electrode sheet.

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