Lamination table, lamination machine and lamination method

Abstract

The invention provides a lamination table, a lamination machine and a lamination method, 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] The present application relates to the field of battery technology, and in particular to a lamination table, a lamination machine and a lamination method. Background Art

[0002] The electrode assembly is one of the core components of the battery. According to the molding method, the electrode assembly is divided into a wound electrode assembly and a laminated electrode assembly. The main molding method of the laminated electrode assembly is: first, a composite material strip is formed by a molding device, and then part of the composite material strip is reciprocally folded in a Z shape on a lamination table to form a folded body, and then the folded body and the rest of the composite material strip are cut to form a laminated electrode assembly. Among them, the composite material strip includes a diaphragm and multiple negative electrode sheets and multiple positive electrode sheets connected by a diaphragm. Each negative electrode sheet, the corresponding positive electrode sheet and the diaphragm located therebetween constitute a composite sheet. Multiple composite sheets are stacked in sequence on the lamination table.

[0003] After a portion of the composite material strip is folded on the lamination table to form a folded body, the folded body and the remaining portion of the composite material strip need to be cut, and after cutting, the end of the composite material strip needs to be guided to the lamination table again, resulting in a low stacking efficiency of the laminated electrode assembly. Summary of the invention

[0004] The embodiments of the present application provide a lamination table, a lamination machine and a lamination method, which can improve the stacking efficiency of a laminated electrode assembly.

[0005] In the first aspect, an embodiment of the present application provides a stacking table, which includes a sub-stacking table and a cutting mechanism; there are multiple sub-stacking tables, which are arranged in sequence along a first direction, and the sub-stacking tables have a bearing surface for bearing a composite material strip A; the multiple sub-stacking tables have a common material splicing station; by moving the multiple sub-stacking tables along the first direction, the multiple sub-stacking tables can be located at the material splicing station in turn; the cutting mechanism is configured to cut the portion of the composite material strip A located between two adjacent sub-stacking tables.

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

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

[0008] In one embodiment, when the first direction is a linear direction, the sub-stack located at the head and tail positions of the first direction also includes a synchronous baffle; for each sub-stack located at the head and tail positions of the first direction, the synchronous baffle is connected to the support plate and is at least partially located on the side of the support surface close to the composite material strip A, and the synchronous baffle of the sub-stack located at the head and tail positions is arranged away from the sub-stack adjacent thereto.

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

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

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

[0012] In one embodiment, the stacking platform further includes a transposition drive assembly, which is connected to a plurality of sub-stacking platforms. The transposition drive assembly drives the sub-stacking platform located at the material receiving station to move to one side of the material receiving station, and simultaneously drives another sub-stacking platform to move to the material receiving station.

[0013] In one embodiment, there are two cutting mechanisms. Along the first direction, the two cutting mechanisms are respectively located on both sides of the material receiving station, and along the unloading 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, and the two sub-stacking platforms are reciprocated along the first direction so that the two sub-stacking platforms are located at the material receiving station in turn.

[0015] In the second aspect, an embodiment of the present application provides a stacking machine, which includes a molding device and the aforementioned stacking table; the molding device is used to mold a composite material strip A, and the composite material strip A includes a plurality of composite sheets connected in sequence by a diaphragm; wherein the composite material strip A output by the molding device moves toward the bearing surface along a second direction, and the second direction is perpendicular to the bearing surface.

[0016] In one embodiment, the molding device 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, and the two diaphragm feeding mechanisms 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 to form a composite material strip B; there are two second feeding mechanisms, and the two second feeding mechanisms are configured to supply the second electrode sheet to both sides of the composite material strip B respectively, and the two second feeding mechanisms feed alternately in sequence; the second thermal bonding mechanism is used to heat at least one of the composite material strip and the second electrode sheet, and press the second electrode sheet and the composite material strip B to form a composite material strip A.

[0017] In one embodiment, the first thermal bonding mechanism includes a first heating component and a first pressing roller component, the first heating component is used to heat the first pole piece, and the first pressing roller component is used to press the diaphragm and the heated first pole piece.

[0018] In one embodiment, the second thermal composite mechanism includes a second heating component and a second pressing roller component, the second heating component is used to heat the second electrode piece, and the second pressing roller component is used to press the composite material strip B with the heated second electrode piece; wherein, there are two second heating components, which are respectively arranged adjacent to the discharge ports of the two second feeding mechanisms.

[0019] In one embodiment, the molding device further includes a heating and heat preservation component, which is disposed between the second feeding mechanism and the second pressing roller assembly, and is used to keep the second pole piece in contact with the composite material strip B and heated.

[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 molding device further comprises a diaphragm edge sealing mechanism, which is located between the first thermal composite mechanism and the discharge port of the second feeding mechanism, and is used to connect the two layers of diaphragms between two adjacent first pole pieces.

[0022] In one embodiment, the molding device also includes a correction device, and the portion where the diaphragm is located between two adjacent first pole pieces is a spacing portion. The correction device collects position information of the spacing portion relative to the working end of the diaphragm edge sealing mechanism, and controls the conveying speed of the composite material strip A according to the position information.

[0023] In one embodiment, the correction device includes an image acquisition end for collecting position information; wherein the image acquisition end is a CCD visual camera acquisition position, and / or the spacing between the image acquisition end and the working end of the diaphragm edge sealing mechanism is 1 to 3 center spacings, and the center spacing is the center spacing 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 pole piece die-cutting assembly and a first pole piece cutting assembly; the first unwinding assembly is used to install the first pole piece roll, and the first pole piece die-cutting assembly is used to cut the empty foil area of ​​the first pole piece roll from the first unwinding assembly to form a first pole piece; the first pole piece cutting assembly is used to cut the first pole piece roll cut by the first pole piece die-cutting assembly to form a first pole piece; and / or, the second feeding mechanism includes a second unwinding assembly, a second pole piece die-cutting assembly, a second pole piece cutting assembly and a second sheet feeding device; the second unwinding assembly is used to install the second pole piece roll, and the second pole piece die-cutting assembly is used to cut the empty foil area of ​​the second pole piece roll from the second unwinding assembly to form a second pole piece; the second pole piece cutting assembly is used to cut the second pole piece roll cut by the second pole piece die-cutting assembly to form a second pole piece; the second sheet feeding device sends the second pole piece roll from the second unwinding assembly to the second pole piece die-cutting assembly, the second pole piece cutting assembly and the composite material strip B in sequence.

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

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

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

[0028] In a third aspect, an embodiment of the present application provides a lamination method, which is applied to stack a composite material strip A on a lamination table provided in some embodiments of the present application, wherein the composite material strip A includes a plurality of composite sheets connected in sequence through a diaphragm;

[0029] The lamination method includes:

[0030] The composite material strip A is conveyed to the carrying surface of the sub-stack platform located at the material receiving station, and two adjacent composite material sheets are stacked in sequence in a direction perpendicular to the carrying surface;

[0031] When the number of composite sheets stacked by the sub-stacking platform located at the material receiving station reaches a preset value, the plurality of sub-stacking platforms are moved along the first direction so that the sub-stacking platform whose carrying surface carries the number of composite sheets reaching the preset value is located at one side of the receiving station, and the other sub-stacking platform is located at the material receiving station;

[0032] When at least one composite material sheet falls onto the carrying surface of the sub-stack located at the material receiving station, the portion of the diaphragm located between two adjacent sub-stacks is cut off by the cutting mechanism.

[0033] Beneficial effects of the embodiments of the present application:

[0034] In the embodiment of the present application, multiple sub-stacks are sequentially arranged along the first direction and moved along the first direction to be located at the material receiving station in turn, so that the composite material strip A carried by the next sub-stack at the material receiving station can be guided by the movement of the previous sub-stack 11 located at the material receiving station. In this way, the position controllability of the composite material strip A carried by the sub-stack can be effectively guaranteed, and no additional material guiding operation is required, thereby improving the stacking efficiency of the laminated electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a structural schematic diagram of a lamination table provided in an embodiment of the present application;

[0037] Figure 2 It is a schematic diagram of the lamination table material connection provided in the embodiment of the present application;

[0038] Figure 3 is a schematic structural diagram of a sub-stack provided in an embodiment of the present application;

[0039] Figure 4 It is a schematic diagram of another lamination table material connection provided in an embodiment of the present application;

[0040] Figure 5 yes Figure 4 The schematic diagram of the stacking table switching the sub-stacking table for receiving materials is shown;

[0041] Figure 6 yes Figure 1 The enlarged view of point A in the middle;

[0042] Figure 7 It is a structural schematic diagram of another stacking table provided in an embodiment of the present application;

[0043] Figure 8 is a structural schematic diagram of a laminating machine provided in an embodiment of the present application;

[0044] Fig. 9 is a top view of a composite material strip provided in an embodiment of the present application;

[0045] Fig.10 is a schematic diagram of the structure of the composite material strip provided in an embodiment of the present application;

[0046] Fig.11 is a schematic diagram of the positional relationship between the image acquisition end and the working end of the diaphragm edge banding machine provided in an embodiment of the present application;

[0047] Fig.12 is a schematic diagram of the positional relationship between the material guiding mechanism and the bearing surface provided in an embodiment of the present application;

[0048] Fig.13 is a schematic flow chart of a lamination method provided in an embodiment of the present application;

[0049] Fig.14 It is a schematic diagram of a first state of a lamination table receiving materials provided in an embodiment of the present application;

[0050] Fig.15 It is a schematic diagram of a second state of the lamination table receiving materials provided in an embodiment of the present application;

[0051] Fig.16 It is a schematic diagram of a third state of the lamination table receiving materials provided in an embodiment of the present application;

[0052] Fig.17 It is a schematic diagram of a fourth state of the lamination table receiving materials provided in an embodiment of the present application;

[0053] Fig.18 It is a schematic diagram of the fifth state of the lamination table receiving materials provided in the embodiment of the present application.

[0054] Description of reference numerals:

[0055] 1-Lamination table;

[0056] 11-sub-stack platform; 111-carrying surface; 112-carrying plate; 113-lifting mechanism; 114-fixed baffle; 115-synchronous baffle; 116-assembly plate;

[0057] 12-first sub-stack; 13-second sub-stack;

[0058] 14- Material receiving station;

[0059] 15-cutting mechanism; 151-cutter; 152-second drive assembly; 153-third drive assembly; 154-pressing knife;

[0060] 16-transposition drive assembly;

[0061] 2- lamination machine; 21- forming device;

[0062] 22-first feeding mechanism; 221-first unwinding assembly; 222-first pole ear die-cutting assembly; 223-first pole piece cutting assembly;

[0063] 23-diaphragm feeding mechanism;

[0064] 24-first thermal composite mechanism; 241-first heating assembly; 242-first pressing roller assembly;

[0065] 25-second feeding mechanism; 251-second unwinding assembly; 252-second pole ear die-cutting assembly; 253-second pole piece cutting assembly; 254-second sheet feeding device;

[0066] 26-second thermal composite mechanism; 261-second heating assembly; 262-second pressing roller assembly;

[0067] 27- Heating and heat preservation component;

[0068] 28-diaphragm edge sealing mechanism; 281-working end;

[0069] 29-correction device; 291-image acquisition end;

[0070] 300-material guiding mechanism; 301-driving roller group; 302-driving roller; 303-first end;

[0071] 31-Material line inspection camera;

[0072] 10-first pole piece; 20-second pole piece; 30-diaphragm; 40-composite material strip A; 400-composite material sheet; 50-composite material strip B; 60-first pole piece roll; 70-second pole piece roll. DETAILED DESCRIPTION

[0073] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0074] In this application, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings. Multiple means at least two. The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0075] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] The terms "comprises," "comprising," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a product or method that includes a list of elements includes not only those elements, but also includes other elements not expressly listed, or also includes elements inherent to such product or method.

[0077] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a lamination table 1 provided in an embodiment of the present application, Figure 2It is a schematic diagram of the material connection of the stacking platform 1 provided in the embodiment of the present application. The embodiment of the present application provides a stacking platform 1. The stacking platform 1 includes a sub-stack 11 and a cutting mechanism 15. There are multiple sub-stacks 11. The multiple sub-stacks 11 are arranged in sequence along the first direction. The sub-stack 11 has a bearing surface 111 for carrying the composite material strip A40. The multiple sub-stacks 11 have a common material connection station 14. Moving the multiple sub-stacks 11 along the first direction can make the multiple sub-stacks 11 be located in turn at the material connection station 14. The cutting mechanism 15 is configured to cut the composite material strip A40 at a position between two adjacent sub-stacks 11.

[0078] It can be understood that the composite material strip A40 includes a plurality of composite material sheets 400, and the composite material sheet 400 includes a separator 30, a negative electrode sheet, a separator 30 and a positive electrode sheet which are composited in sequence. The separators 30 of two adjacent composite material sheets 400 are connected to each other.

[0079] It can be understood that the cutting mechanism 15 can be arranged on one side of the sub-stacking platform 11, can also be arranged on one side of the material receiving station, and can also be held in the hand of the operator.

[0080] It can be understood that in order to reduce the difficulty of joining the materials, the carrying surface 111 is parallel to the horizontal plane, and the composite material strip A40 can fall onto the carrying surface 111 under the action of gravity.

[0081] It can be understood that the movement of the sub-stack 11 along the first direction can be achieved by a driving assembly or by manual operation.

[0082] It can be understood that one receiving station 14 can be configured, and the position of the sub-stack 11 located on one side of the receiving station 14 can be the unloading station.

[0083] It can be understood that the number of sub-stacks 11 can be two or more. When the number of sub-stacks 11 is two, the first direction is a linear direction, and the two sub-stacks 11 are moved back and forth along the first direction, so that the two sub-stacks 11 can be located at the material receiving station 14 and the unloading station in turn. When the number of sub-stacks 11 is multiple, the first direction can be a linear direction. At this time, each sub-stack 11 can be moved in sequence along one direction first, so that the multiple sub-stacks 11 are located at the material receiving station 14 in turn. When all sub-stacks 11 have completed the material receiving, each sub-stack 11 is moved in sequence along the opposite direction, so that the multiple sub-stacks 11 are located at the material receiving station 14 in turn again to receive the material.

[0084] In addition, when there are multiple sub-stacks 11, the first direction can also be rotated, for example, clockwise or counterclockwise. In this case, the multiple sub-stacks 11 can be arranged in a ring, so that each sub-stack 11 moves in turn clockwise or counterclockwise so that the multiple sub-stacks 11 are located in the material receiving station 14 in turn. In order to adapt to the formation of the composite sheet 400, the movement trajectory of the sub-stack 11 at the material receiving position is a straight line.

[0085] like Figure 2 As shown, when receiving materials, when the number of composite sheets 400 carried by the sub-stack 11 located at the receiving station 14 reaches a preset value, each sub-stack 11 is moved along the first direction so that the sub-stack 11 carrying the composite sheets 400 reaching the preset value is located at the unloading station, and another sub-stack 11 is located at the receiving station 14. As the sub-stack 11 moves, the continuously transported composite sheets 400 automatically fall onto the next carrying surface 111 located at the receiving station 14 to perform the stacking operation of the next laminated electrode assembly. Then, the composite material strip A40 is cut at the position between two adjacent sub-stacks 11 by the cutting mechanism 15, so that the composite sheets 400 located at the unloading station can be unloaded.

[0086] In this embodiment, by sequentially arranging a plurality of sub-stacks 11 along the first direction and moving them along the first direction, they can be positioned at the material receiving station 14 in turn, so that the composite material strip A40 carried by the next sub-stack 11 positioned at the material receiving station 14 can be guided by the movement of the previous sub-stack 11 positioned at the material receiving station 14. In this way, on the one hand, the position controllability of the composite material strip A40 carried by the sub-stack 11 can be effectively guaranteed, and no additional material guiding operation is required, thereby improving the stacking efficiency of the laminated electrode assembly; on the other hand, the alignment of the first and last composite material sheets 400 of each laminated electrode assembly can be improved, thereby improving the stacking neatness of the electrode assemblies stacked on the lamination table 1.

[0087] Among them, the material guiding operation refers to guiding the cut end of the composite material strip A40 to the preset position of the carrying surface 111, so that the end of the composite material strip A40 from the molding device can be folded back and forth in a Z shape on the carrying surface 111 according to the preset folding direction under the action of gravity to form a neat folded body.

[0088] See also Figure 3 , Figure 3 1 is a schematic diagram of the structure of the sub-stack 11 provided in an embodiment of the present application. In one embodiment, the sub-stack 11 includes a carrier plate 112 and a lifting mechanism 113. The carrier plate 112 has a carrier surface 111. The lifting mechanism 113 is connected to the carrier plate 112. The lifting mechanism 113 is used to adjust the height position of the carrier surface 111.

[0089] Exemplarily, 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-type telescopic assembly, a lead screw assembly, and a return spring.

[0090] It can be understood that the driving end of the lifting mechanism 113 is connected to the carrying plate 112 .

[0091] It can be understood that the lifting mechanism 113 can be fixed on any structure other than the sub-stack platform 11 and can move along the first direction with the sub-stack platform 11 .

[0092] It is understandable that as the composite sheets 400 are stacked on the carrying surface 111 located at the receiving station 14, the height of the composite sheets 400 stack will continue to increase. If the height position of the carrying surface 111 is not adjusted, the position of the composite sheets 400 dropping will continue to increase, resulting in a decrease in the smoothness of the composite sheets 400 that subsequently fall into the sub-stack stage 11.

[0093] Based on this, the present embodiment provides a lifting mechanism 113 for adjusting the height of the carrying surface 111. Figure 4 As shown, Figure 4 It is a schematic diagram of another material receiving of the stacking table 1 provided by an embodiment of the present application. As the stacking height of the composite sheets 400 continues to increase, the height position of the carrier plate 112 is adjusted by the lifting mechanism 113 so that the height position of the carrier plate 112 continues to decrease. When the carrier plate 112 is empty, the carrier plate 112 is at the highest position. Optionally, the height of the empty carrying surface 111 is consistent with the height of the top surface loaded with a preset number of composite sheets 400. When the carrier plate 112 is loaded with a preset number of composite sheets 400, the height position of the carrier plate 112 is the lowest.

[0094] In this embodiment, a lifting mechanism 113 is provided to adjust the height of the carrying surface 111, so that the height of the carrying surface 111 can be continuously reduced as the stacking height of the composite sheet 400 continues to increase, so that the falling position heights of each composite sheet 400 are consistent, thereby improving the smoothness of the subsequent composite sheet 400 falling into the sub-stack platform 11.

[0095] Furthermore, by setting a lifting mechanism 113 to adjust the height of the carrying surface 111, the top surface of the stacked composite sheet 400 can be made consistent with the height of the carrying surface 111 of the next receiving sub-stack 11 after carrying a composite sheet 400. In this way, not only can the smoothness of the cutting mechanism 15 cutting the composite material strip A40 located between two adjacent sub-stacks 11 be improved, but also the support of the carrying plate 112 located at the receiving station 14 for the composite sheet 400 can be improved, so as to improve the smoothness of cutting, such as Figure 5 As shown, Figure 5 yes Figure 4The schematic diagram of the lamination platform 1 shown is a sub-lamination platform 11 for switching the material.

[0096] In addition, by setting 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 consistent with the height of the bearing surface 111 of the next material receiving sub-stack 11 after carrying a composite sheet 400, so that the composite sheet 400 on the next material receiving sub-stack 11 can be in a horizontal position, so that there is a larger contact area between the composite sheet 400 and the corresponding bearing surface 111. In this way, after the composite material strip A40 is cut at the part between two adjacent sub-stacks 11, the composite sheet 400 on the next material receiving sub-stack 11 will not move. In this way, the movement of the previous sub-stack 11 located at the material receiving station 14 can improve the smoothness of the material guiding of the next sub-stack 11 located at the material receiving station 14 to carry the composite material strip A40.

[0097] See also Figure 3 In one embodiment, the sub-stack 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-stacks 11 along the first direction are arranged adjacent to each other. When the carrier plate 112 is at the lowest position, the fixed baffle 114 is at least partially located on the side of the carrier surface 111 close to the composite material strip A40. When the carrier plate 112 is at the highest position, the fixed baffle 114 does not exceed the carrier surface 111.

[0098] It can be understood that the fixed baffle 114 is fixed relative to the lifting mechanism 113 , which specifically means that the fixed baffle 114 , like the lifting mechanism 113 , can move with the movement of the corresponding sub-stack 11 , but does not move with the movement of the driving end of the lifting mechanism 113 .

[0099] It can be understood that the fixed baffle 114 can be fixed to any structure outside the sub-stack 11 and can move along the first direction with the sub-stack 11 , for example, the outer shell of the lifting mechanism 113 .

[0100] It can be understood that as the stacking height of the composite sheet 400 increases, the height of the carrier plate 112 decreases, so that the height dimension of the fixed baffle 114 located on the side of the carrier surface 111 close to the composite material strip A40 increases continuously. Figure 4 and Figure 5 In this way, the stacked composite sheets 400 can be limited by the fixed baffle 114, so that when the sub-stack 11 is moving, the stacked composite sheets 400 can be prevented from moving relative to the carrier plate 112 due to inertia, thereby increasing the moving speed of the sub-stack 11 to improve the stacking efficiency of the laminated electrode assembly.

[0101] See also Figure 3In one embodiment, when the first direction is a linear direction, the sub-stacks 11 located at the head and tail positions in the first direction further include a synchronous baffle 115. For each sub-stack 11 located at the head and tail positions in the first direction, the synchronous baffle 115 is connected to the carrier plate 112 and is at least partially located on the side of the carrier surface 111 close to the composite material strip A40. The synchronous baffle 115 of the sub-stack 11 located at the head and tail positions is arranged away from the sub-stack 11 adjacent thereto.

[0102] It is understandable that since one side of the first and last sub-stacks 11 is provided with a sub-stack 11 and the other side is vacant, a synchronous baffle 115 can be provided on the side of the first and last sub-stacks 11 where no sub-stack 11 is provided without affecting the stacking of the composite sheet 400.

[0103] In this embodiment, by setting a synchronization baffle 115 on the head and tail sub-stacks 11, the stacked composite sheets 400 can be limited by the synchronization baffle 115, and the synchronization baffle 115 can be directly fixed on the receiving plate without additionally designing a sliding fitting structure between the synchronization baffle 115 and the receiving plate, thereby reducing the design difficulty and manufacturing difficulty.

[0104] See also 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 composite tape A40 between two adjacent sub-stacks 11.

[0105] Exemplarily, 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-type telescopic assembly, and a lead screw assembly.

[0106] It can be understood that the driving end of the second driving assembly 152 is connected to the cutter 151 .

[0107] It can be understood that the second drive assembly 152 can be fixed on the sub-stack 11, and in this case, a cutting mechanism 15 needs to be configured for each sub-stack 11. The second drive assembly 152 can also be fixed on the frame so that its position is fixed and the composite material strip A40 between each sub-stack 11 at the material receiving station 14 and the sub-stack 11 located on one side of the material receiving station 14 can be cut.

[0108] It is understood that the length of the cutting edge of the cutter 151 is not less than the dimension of the position on the composite material strip that needs to be cut along the extending direction of the cutting edge. In this way, the composite material strip A40 can be cut by one cut.

[0109] See also Figure 1 or Figure 2 or Figure 4 or Figure 5 In one embodiment, the cutting mechanism 15 further includes a pressing knife 154 and a third driving assembly 153. The third driving assembly 153 is connected to the pressing knife 154 and the second driving assembly 152. The third driving assembly 153 drives the pressing knife 154 and the second driving assembly 152 to reciprocate along the second direction. The pressing knife 154 is configured to press down the composite material strip A40 located at the material receiving station 14.

[0110] Specifically, the pressing knife 154 is configured to press down the edge of the diaphragm 30 of the composite material strip A40 located at the splicing station 14 .

[0111] Exemplarily, the third driving assembly 153 includes, but is not limited to, a linear motor, a pneumatic rod, a hydraulic rod, a worm gear assembly, a scissor-type telescopic assembly, and a lead screw assembly.

[0112] It can be understood that the driving end of the third driving assembly 153 is connected to the pressing knife 154 and the second driving assembly 152 .

[0113] It can be understood that the third driving assembly 153 can be fixed on the sub-stack 11, and in this case, a cutting mechanism 15 needs to be configured for each sub-stack 11. The third driving assembly 153 can also be fixed on the frame so that its position is fixed and the composite material strip A40 between each sub-stack 11 located at the material receiving station 14 and the sub-stack 11 located on one side of the material receiving station 14 can be cut.

[0114] It can be understood that when cutting the composite material strip A40 between two adjacent sub-stacks 11, the third driving assembly 153 is first started to make the pressing knife 154 press the composite material strip A40, specifically, the pressing knife 154 presses the diaphragm 30 between two adjacent composite sheets 400. Then the second driving assembly 152 is started to move the pressing knife 154 downward, thereby cutting the composite material strip A40 between two adjacent sub-stacks 11.

[0115] In this embodiment, by providing a pressing blade 154, the stacked composite strips can be fixed when cutting the composite strips A40, thereby preventing the stacked composite sheets 400 from moving during the cutting process. In this way, the position consistency of the composite sheets 400 before and after cutting can be effectively ensured to improve the neatness of the stacking of the composite sheets 400.

[0116] See also Figure 6 , Figure 6 yes Figure 1 In one embodiment, the distance d1 between the pressing blade 154 and the edge of the bearing surface 111 adjacent thereto is 2 mm to 6 mm.

[0117] It can be understood that the distance d1 between the pressing knife 154 and the adjacent edge of the supporting surface 111 located at the material receiving station 14 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.

[0118] In this embodiment, by limiting the distance d1 between the pressing blade 154 and the edge of the supporting surface 111 adjacent thereto, damage to the current collector and active material layer of the positive and negative electrode sheets during the cutting process of the pressing blade 154 can be avoided, thereby ensuring the quality of the laminated electrode assembly.

[0119] See also Figure 1 or Figure 7 , Figure 7 1 is a schematic diagram of the structure of another stacking platform provided in an embodiment of the present application. In one embodiment, the stacking platform 1 further includes a transposition drive assembly 16. The transposition drive assembly 16 is connected to a plurality of sub-stacks 11. The transposition drive assembly 16 drives the sub-stack 11 located at the material receiving station 14 to move to one side of the material receiving station 14, and simultaneously drives another sub-stack 11 to move to the material receiving station 14.

[0120] Exemplarily, the transposition drive assembly 16 includes, but is not limited to, a linear motor, a pneumatic rod, a hydraulic rod, a worm gear assembly, a scissor-type telescopic assembly, and a lead screw assembly.

[0121] It can be understood that the driving end of the transposition driving assembly 16 is connected to the sub-stack 11 .

[0122] It can be understood that the transposition drive assembly 16 can be fixed on the frame or directly fixed on the ground.

[0123] Specifically, the transposition drive assembly 16 is a screw assembly. The axis of the screw is parallel to the first direction. A drive nut is threadedly sleeved on the screw. The drive nut serves as a driving end of the transposition drive assembly. The screw rotates forward or reversely to drive the nut to move back and forth along the first direction, thereby driving the sub-stack 11 to move back and forth along the first direction.

[0124] Specifically, the lifting mechanism 113 and the fixed baffle 114 are fixed to the driving end of the transposition driving assembly 16 .

[0125] In this embodiment, the sub-stacking platforms 11 are driven to move along the first direction by the transposition drive assembly 16 , which can reduce the labor intensity of workers and ensure the movement consistency of each sub-stacking platform 11 , so as to facilitate the smooth stacking of the composite sheet 400 .

[0126] In addition, if Figure 7As shown, in order to improve the integrity of each sub-stack 11, an assembly plate 116 can be set between the sub-stack 11 and the driving end of the transposition drive assembly 16, so that the sub-stack 11 can be assembled on the assembly plate 116, and then fixed to the driving end of the transposition drive assembly 16 through the assembly plate 116 to improve the convenience of assembly.

[0127] See also Figure 1 or Figure 2 or Figure 4 or Figure 5 In one embodiment, there are two cutting mechanisms 15. Along the first direction, the two cutting mechanisms 15 are respectively located on both sides of the material receiving station 14. And along the material feeding direction of the composite material strip A40, the structures of the two cutting mechanisms 15 are symmetrical to each other. In this way, the difficulty of arranging the cutting mechanisms 15 can be reduced, and one of the cutting mechanisms 15 to be operated can be maintained during the operation of continuously cutting the composite material strip A40, so as to improve the smoothness of stacking the composite material sheet 400.

[0128] See also Figure 1 or Figure 2 or Figure 4 or Figure 5 In one embodiment, there are two sub-stacking platforms 11. The two sub-stacking platforms 11 are reciprocated along the first direction so that the two sub-stacking platforms 11 are alternately located at the material receiving station 14. In this way, the number of sub-stacking platforms 11 can be reduced to meet the needs of stacking the composite sheet 400, and the complexity of switching the sub-stacking platforms 11 can be reduced to improve the smoothness of stacking the composite sheet 400.

[0129] See also Figure 8 , Figure 8 It is a structural schematic diagram of a stacking machine 2 provided in an embodiment of the present application. Accordingly, an embodiment of the present application provides a stacking machine 2. The stacking machine 2 includes a molding device 21 and the aforementioned stacking table 1. The molding device 21 is used to mold a composite material strip A40. The composite material strip A40 includes a plurality of composite sheets 400 sequentially connected by a diaphragm 30. The diaphragms 30 of two adjacent composite sheets 400 are connected to each other. Among them, the composite material strip A40 output by the molding device 21 moves toward the bearing surface 111 along the second direction, and the second direction is perpendicular to the bearing surface 111.

[0130] In this embodiment, by adopting the laminating stage 1 provided in some embodiments of the present application, a plurality of sub-laminating stages 11 can be sequentially arranged along the first direction, and can be moved along the first direction to be located in the material receiving station 14 in turn, so that the composite material strip A40 carried by the next sub-laminating stage 11 located in the material receiving station 14 can be guided by the movement of the previous sub-laminating stage 11 located in the material receiving station 14. In this way, the position controllability of the composite material strip A40 carried by the sub-laminating stage 11 can be effectively guaranteed, and no additional material guiding operation is required, thereby improving the stacking efficiency of the laminated electrode assembly.

[0131] See also Figure 8 In one embodiment, the molding device 21 includes a first feeding mechanism 22, a diaphragm feeding mechanism 23, a first thermal composite mechanism 24, a second feeding mechanism 25 and a second thermal composite mechanism 26; the first feeding mechanism 22 is used to provide the first electrode 10; there are two diaphragm feeding mechanisms 23, and the two diaphragm feeding mechanisms 23 are respectively located on both sides of the first feeding mechanism 22, and the two diaphragm feeding mechanisms 23 are configured to supply the diaphragm 30 to both sides of the first electrode 10 respectively; the first thermal composite mechanism 24 is used to heat the diaphragm 30 and at least one of the first electrode 10 The diaphragm 30 is heated and pressed together with the first electrode piece 10 to form a composite material strip B50. There are two second feeding mechanisms 25, and the two second feeding mechanisms 25 are respectively located on both sides of the first feeding mechanism 22. The two second feeding mechanisms 25 are configured to supply the second electrode piece 20 to both sides of the composite material strip B50, and the two second feeding mechanisms 25 feed alternately in sequence. The second thermal bonding mechanism 26 is used to heat at least one of the composite material strip and the second electrode piece 20, and press the second electrode piece 20 and the composite material strip B50 to form a composite material strip A40.

[0132] It can be understood that the speed at which the first feeding mechanism 22 and the second feeding mechanism 25 convey the first electrode sheet 10 and the second electrode sheet 20 can be adjusted so that the spacing between two adjacent composite sheets 400 can be adapted to different production requirements. For example, when the first electrode sheet 10 and the second electrode sheet 20 conveyed by the first feeding mechanism 22 and the second feeding mechanism 25 belong to the same laminated electrode assembly, the feeding speed can be increased so that the spacing d2 between two adjacent composite sheets 400 is smaller. Optionally, the spacing d2 is 1 mm to 2 mm, such as Fig. 9 As shown, Fig. 9 It is a top view of the composite material strip provided in the embodiment of the present application.

[0133] When the first electrode sheet 10 and the second electrode sheet 20 conveyed by the first feeding mechanism 22 and the second feeding mechanism 25 belong to two laminated electrode assemblies and the previous first electrode sheet 10 and the second electrode sheet 20, the feeding speed can be reduced to make the distance d3 between the two laminated electrode assemblies larger, so as to facilitate smooth cutting by the cutting mechanism 15. Optionally, the distance d3 is 0.3 mm to 0.5 mm, such as Fig. 9 As shown,.

[0134] In addition, in order to avoid lithium deposition, the number of negative electrode sheets in each electrode assembly can be greater than the number of positive electrode sheets. For example, the negative electrode sheet and the separator 30 can be compounded in the head composite laminate or the tail composite laminate of each electrode assembly, such as Fig.10 As shown, Fig.10 It is a schematic diagram of the structure of the composite material strip provided in the embodiment of the present application.

[0135] See also Figure 8 In one embodiment, the first thermal composite mechanism 24 includes a first heating component 241 and a first pressing roller component 242. The first heating component 241 is used to heat the first pole piece 10. The first pressing roller component 242 is used to press the diaphragm 30 and the heated first pole piece 10. In this embodiment, by heating the first pole piece 10 so that the first pole piece 10 and the diaphragm 30 are composited into one, on the one hand, the blockage of the air pores of the diaphragm 30 can be effectively avoided, thereby ensuring the air permeability of the diaphragm 30; on the other hand, the heating of the diaphragm 30 can be avoided to cause the rubber particles on the surface of the diaphragm 30 to stick to the roller, thereby reducing the difficulty of cleaning the first pressing roller component 242.

[0136] Furthermore, the method of heating the diaphragm 30 by the first pressing roller assembly 242 is eliminated, so that the structural complexity of the first pressing roller can be reduced, thereby reducing the manufacturing cost of the laminating machine 2.

[0137] Optionally, the first pressing roller assembly 242 includes two composite rollers arranged opposite to each other. The two composite rollers squeeze the stacked first pole piece 10 and the diaphragm 30 to connect the first pole piece 10 and the diaphragm 30 into one body.

[0138] The distance between the heating end of the first heating component 241 and the first pole piece 10 can be 3 mm to 5 mm. The first heating component 241 can heat the first pole piece 10 to 80° C. to 180° C. In this way, the first pole piece 10 can melt the diaphragm 30, thereby combining the first pole piece 10 and the diaphragm 30 into one, and can also prevent the first pole piece 10 from being damaged due to high temperature.

[0139] See also Figure 8 In one embodiment, the second thermal composite mechanism 26 includes a second heating component 261 and a second pressing roller component 262. The second heating component 261 is used to heat the second electrode piece 20. The second pressing roller component 262 is used to press the composite material strip B50 with the heated second electrode piece 20. There are two second heating components 261, which are respectively arranged adjacent to the discharge ports of the two second feeding mechanisms 25. In this embodiment, by heating the second electrode piece 20 so that the second electrode piece 20 and the composite material strip B50 are composited into one, on the one hand, the blockage of the air pores of the diaphragm 30 can be effectively avoided, thereby ensuring the air permeability of the diaphragm 30; on the other hand, the heating of the diaphragm 30 can be avoided to cause the rubber particles on the surface of the diaphragm 30 to stick to the roller, thereby reducing the difficulty of cleaning the second pressing roller component 262.

[0140] Optionally, the second pressing roller assembly 262 includes two composite rollers arranged opposite to each other. The two composite rollers squeeze the stacked second pole piece 20 and composite material strip B50, thereby connecting the second pole piece 20 and composite material strip B50 into one body.

[0141] Furthermore, the method of heating the diaphragm 30 by the second pressing roller assembly 262 is eliminated, so that the structural complexity of the second pressing roller can be reduced, thereby reducing the manufacturing cost of the laminating machine 2.

[0142] The spacing between the heating end of the second heating component 261 and the first pole piece 10 can be 3 mm to 5 mm. The second heating component 261 can heat the second pole piece 20 to 80° C. to 180° C. In this way, the second pole piece 20 can melt the diaphragm 30 to combine the second pole piece 20 and the diaphragm 30 into one body, and can also prevent the second pole piece 20 from being damaged due to high temperature.

[0143] In addition, compared with the method of arranging two second heating components 261 at the position where the second electrode piece 20 contacts the composite material strip B50 to heat the second electrode piece 20, arranging the two second heating components 261 respectively adjacent to the discharge ports of the two second feeding mechanisms 25 can not only reduce the layout length of the molding device 21 to reduce the footprint of the molding device 21, but also avoid the heating of the second electrode piece 20 affecting the diaphragm 30, thereby effectively ensuring the air permeability of the diaphragm 30.

[0144] See also Figure 8 In one embodiment, the molding device 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 pressing roller component 262. The heating and heat preservation component 27 is used to keep the second pole piece 20 in contact with the composite material strip B50 and heated.

[0145] The heating temperature range of the heating and heat preservation component 27 is 40°C to 80°C.

[0146] Optionally, the heating and heat preservation component 27 may be an oven. After the second pole piece 20 contacts the composite material strip B50, it enters the heating and heat preservation component 27 from one end thereof, and is output from the other end thereof and enters the second pressing roller component 262.

[0147] It can be understood that since the two second heating components 261 are respectively arranged adjacent to the discharge ports of the two second feeding mechanisms 25, when the second pole piece 20 is heated and then composited onto the composite material strip B50 by the second pressing roller assembly 262, the journey is relatively long, which may easily lead to a lower temperature when the second pole piece 20 is composited with the composite material strip B50.

[0148] Based on this, in this embodiment, by providing a heating and heat preservation component 27, the second pole piece 20 can be heated and heat-insulated to effectively ensure the composite temperature of the molded composite material strip A40, thereby ensuring the molding quality of the composite material strip.

[0149] 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.

[0150] Optionally, the heating method of the first thermal composite mechanism 24 and the second thermal composite mechanism 26 is electromagnetic heating. Electromagnetic heating is a heating method that converts electrical energy into thermal energy using the principle of electromagnetic induction. During the electromagnetic heating process, the first thermal composite mechanism 24 and the second thermal composite 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 the magnetic field, the magnetic lines of force 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 of the eddy current current collector move irregularly at high speed, and the atoms collide and rub against each other to generate heat energy.

[0151] The use of electromagnetic heating can reduce the loss in the heat transfer process, and can make the first pole piece 10 and the second pole piece 20 reach a higher temperature in a short time, and can improve the control accuracy of the heating temperature. In this way, the stacking efficiency of the laminated electrode assembly can be improved.

[0152] See also Figure 8 In one embodiment, the molding device 21 further includes a diaphragm edge sealing mechanism 28. The diaphragm edge sealing mechanism 28 is located between the first thermal composite mechanism 24 and the discharge port of the second feeding mechanism 25. The diaphragm edge sealing mechanism 28 is used to connect the two layers of diaphragms 30 located between two adjacent first pole pieces 10. In this way, after cutting the composite material strip A40, the cut parts of the diaphragm 30 can be connected as one through the edge sealing operation to effectively avoid the diaphragm 30 from flanging, thereby improving the insulation isolation between the positive and negative pole pieces. In this way, the quality of the stacked electrode assembly can be improved.

[0153] It can be understood that the extension direction of the hot melt seam formed on the diaphragm 30 by the diaphragm edge sealing mechanism 28 is perpendicular to the transmission direction of the composite material strip.

[0154] Optionally, the working end 281 of the edge sealing machine of the diaphragm 30 is a cam mechanism. The cam mechanism rotates so that its outer peripheral surface contacts the diaphragm 30. The cam mechanism is powered and heat-conducted, so that the diaphragm 30 is melted, so that the diaphragms 30 on both sides of the pole piece are connected to each other.

[0155] Optionally, the width w1 of the hot-melt seam formed by the diaphragm edge sealing mechanism 28 hot-melting the diaphragm 30 is 0.3 mm to 0.5 mm. Fig. 9 shown.

[0156] See also Figure 8In one embodiment, the forming device 21 further includes a deviation correction device 29. The portion of the diaphragm 30 between two adjacent first pole pieces 10 is a spacing portion. The deviation correction device 29 collects position information of the spacing portion relative to the working end 281 of the diaphragm edge sealing mechanism 28, and controls the conveying speed of the composite material strip A40 according to the position information.

[0157] The deviation correction device 29 includes an image acquisition terminal 291 for acquiring position information, and the image acquisition terminal is a CCD (Charge Coupled Device) visual camera for acquiring position information.

[0158] It can be understood that the working end 281 refers to a component of the diaphragm 30 edge sealing machine used to connect two layers of diaphragms 30 together. For example, the working end 281 of the cam-type diaphragm 30 edge sealing machine is a cam.

[0159] Optionally, there are two image acquisition ends 291, and the two image acquisition ends 291 are respectively located on both sides of the working end 281 of the edge banding machine of the diaphragm 30 along the conveying direction of the composite material strip A40.

[0160] In this embodiment, by setting up the correction device 29, the position information of the spacing part relative to the working end 281 of the diaphragm 30 edge banding machine can be used, and the conveying speed of the composite material strip A40 can be controlled according to the position information to ensure the control closed loop of the correction operation, thereby effectively ensuring the correspondence between the spacing part and the working section of the diaphragm 30 edge banding machine, so as to effectively ensure the accuracy of the hot melt seam position.

[0161] See also Fig.11 , Fig.11 Schematic diagram of the positional relationship between the image acquisition end 291 and the working end 281 of the membrane 30 edge banding machine provided in the embodiment of the present application. In one embodiment, the spacing W2 between the image acquisition end 291 and the working end 281 of the membrane edge banding mechanism 28 is 1 to 3 center spacings. The center spacing is the center spacing between two adjacent composite sheets 400 when the composite strip A40 is in a flattened state.

[0162] It can be understood that the distance W2 between the image acquisition end 291 and the working end 281 of the diaphragm edge sealing mechanism 28 includes but is not limited to 1 center distance, 1.5 center distances, 2 center distances, 2.2 center distances, 2.8 center distances, and 3 center distances.

[0163] In this embodiment, through the above-mentioned limitation, on the one hand, it is possible to avoid the spacing being too small, thereby providing sufficient adjustment time for the deviation correction device 29 to control the conveying speed of the composite material strip A40 according to the position information; on the other hand, it is possible to avoid the spacing being too large, thereby avoiding missing the position information of a certain partition part relative to the working end 281 of the diaphragm 30 edge banding machine.

[0164] In one embodiment, the first feeding mechanism 22 includes a first unwinding assembly 221, a first pole tab die-cutting assembly 222, and a first pole piece 10 cutting assembly 223. The first unwinding assembly 221 is used to install the first pole piece 10 roll. The first pole tab die-cutting assembly 222 is used to cut the empty foil area of ​​the first pole piece 10 roll from the first unwinding assembly 221 to form the first pole tab. The first pole piece 10 cutting assembly 223 is used to cut the first pole piece 10 roll cut by the first pole tab die-cutting assembly 222 to form the first pole piece 10. In this way, the first feeding mechanism 22 is simple and easy to manufacture.

[0165] Among them, the power source for the first pole piece 10 to move from the first feeder to the contact with the diaphragm 30 can be the first feeder or the first heat load mechanism, and a sheet feeding device can also be configured for it to roll the first pole piece 10 from the first unwinding assembly 221 to between the two layers of diaphragms 30 through the sheet feeding device.

[0166] See also Figure 8 In some embodiments, the second feeding mechanism 25 includes a second unwinding assembly 251, a second pole piece die-cutting assembly 252, a second pole piece 20 cutting assembly 253 and a second film feeding device 254. The second unwinding assembly 251 is used to install the second pole piece 20 roll. The second pole piece die-cutting assembly 252 is used to cut the empty foil area of ​​the second pole piece 20 roll from the second unwinding assembly 251 to form a second pole piece. The second pole piece 20 cutting assembly 253 is used to cut the second pole piece 20 roll cut by the second pole piece die-cutting assembly 252 to form a second pole piece 20. The second film feeding device 254 delivers the second pole piece 20 roll from the second unwinding assembly 251 to the second pole piece die-cutting assembly 252, the second pole piece 20 cutting assembly 253 and the composite material strip B50 in sequence. In this way, the second feeding mechanism 25 is simple and easy to manufacture.

[0167] See also Figure 8 In one embodiment, the laminating machine 2 further comprises a material guiding mechanism 300. The forming device 21 transmits the composite material strip A40 in a direction parallel to the horizontal plane. The material guiding mechanism 300 is located above the material receiving station 14. The material guiding mechanism 300 guides the composite material strip A40 from the forming device 21 to the carrying surface 111 located at the material receiving station 14 along the second direction.

[0168] It can be understood that when the composite material strip A40 is guided along the second direction to the carrying surface 111 located at the material receiving station 14, the composite material strip A40 can be moved by gravity, thereby reducing power consumption and reducing the difficulty of stacking the composite material sheets 400 on the carrying surface 111.

[0169] If the forming device 21 is fed along the second direction, the height of the forming device 21 will be relatively large, which will not only make the arrangement of the forming device 21 more difficult, but also make maintenance more difficult.

[0170] Therefore, in this embodiment, the forming device 21 is used to transfer the composite material strip A40 in a direction parallel to the horizontal plane, and a material guide mechanism 300 is provided on the forming device 21 and the stacking table 1, so that the composite material strip A40 is guided along the second direction to the bearing surface 111 located at the material receiving station 14. In this way, not only the height dimension of the forming device 21 can be reduced to reduce the difficulty of its arrangement and improve the convenience of maintenance, but also when the composite material strip A40 is guided along the second direction to the bearing surface 111 located at the material receiving station 14, the power consumption can be reduced, and the smoothness of stacking the composite material sheet 400 on the bearing surface 111 can be improved.

[0171] See also Figure 8 In one embodiment, the material guide mechanism 300 includes a plurality of drive roller 302 groups 301. The plurality of drive roller 302 groups 301 are arranged at intervals along the second direction. Each drive roller 302 group 301 includes two drive rollers 302 arranged at intervals along the first direction. The spacing between the two drive rollers 302 of each drive roller 302 group 301 is used to transmit the composite material strip A40. In this way, the stability of the transmission of the composite material strip A40 can be improved.

[0172] Optionally, the material guiding mechanism 300 includes two drive roller groups 302 .

[0173] Please refer to Fig.12 , Fig.12 Schematic diagram of the positional relationship between the material guide mechanism 300 and the bearing surface 111 provided in an embodiment of the present application. In one embodiment, the material guide 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 spacings. The center spacing is the center spacing between two adjacent composite sheets 400 when the composite strip A40 is in a flattened state.

[0174] It can be understood that the distance W3 between the end of the material guiding mechanism 300 facing the bearing surface 111 and the bearing surface 111 includes but is not limited to 1.5 center spacings, 1.6 center spacings, 1.7 center spacings, 1.8 center spacings, and 2 center spacings.

[0175] In this embodiment, by limiting the distance W3 between the end of the material guide mechanism 300 facing the bearing surface 111 and the bearing surface 111, it is possible to prevent the composite material sheet 400 from falling to an insufficient height and from falling to an excessive height so as to deviate from the preset falling position. In this way, the neatness of the stacking of the composite material sheets 400 can be improved.

[0176] In one embodiment, the first feeding mechanism 22 is used to provide negative electrode sheets, and the second feeding mechanism 25 is used to provide positive electrode sheets.

[0177] It can be understood that the active material layer of the positive electrode sheet uses an oily binder, so the surface of the positive electrode sheet is relatively smooth, and it is easy to be hot-melt connected with the separator 30. The active material layer of the negative electrode sheet uses an aqueous binder, and the negative electrode sheet is mainly composed of layered graphite, and the peeling force between its active material and the foil is lower than that of the positive electrode. Therefore, the peeling force between the negative electrode sheet and the separator 30 is much lower than the peeling force between the positive electrode sheet and the separator 30.

[0178] Based on this, in this embodiment, the negative electrode sheet is first compounded with the upper and lower layers of the separator 30, and based on the hot melt connection between the positive electrode sheet and the separator 30, the negative electrode sheet is again compounded with the upper and lower layers of the separator 30, so that the reliability of the connection between the negative electrode sheet and the separator 30 can be improved.

[0179] In one embodiment, the stacking machine 2 further includes a material line detection camera 31. The material line detection camera 31 detects whether the positive and negative tabs of the composite material strip A40 are folded. If folded, an alarm is activated to remind relevant operators to handle it.

[0180] See also Fig.13 , Fig.13 : is a flow chart of a lamination method provided in an embodiment of the present application. Accordingly, an embodiment of the present application provides a lamination method. The method is applied to stacking a composite material strip A40 on a lamination table 1 provided in some embodiments of the present application, wherein the composite material strip A40 includes a plurality of composite material sheets 400 sequentially connected by a diaphragm 30.

[0181] The lamination method includes:

[0182] S100, conveying the composite material strip A40 to the carrying surface 111 of the sub-stack platform 11 located at the material receiving station 14, and stacking two adjacent composite material sheets 400 in sequence along a direction perpendicular to the carrying surface 111;

[0183] S200, when the number of composite sheets 400 stacked on the sub-stack 11 located at the material receiving station 14 reaches a preset value, multiple sub-stacks 11 are moved along the first direction, so that the sub-stack 11 whose number of composite sheets 400 carried by the carrying surface 111 reaches the preset value is located at one side of the receiving station, and at the same time, another sub-stack 11 is located at the material receiving station 14;

[0184] S300 , when at least one composite sheet 400 falls onto the carrying surface 111 of the sub-stack 11 located at the material receiving station 14 , the portion of the diaphragm 30 located between two adjacent sub-stacks 11 is cut off by the cutting mechanism 15 .

[0185] The lamination method is described in detail below by taking the lamination stage 1 including two sub-stacks 11 as an example. For the convenience of description, the two sub-stacks 11 are respectively a first sub-stack 12 and a second sub-stack 13 .

[0186] See also Figure 14-17 , the lamination method comprises:

[0187] The composite material strip A40 is conveyed to the carrying surface 111 of the first sub-stack 12 located at the material receiving station 14, and two adjacent composite material sheets 400 are stacked in sequence along a direction perpendicular to the carrying surface 111, as shown in FIG. Fig.14 As shown;

[0188] When the number of composite sheets 400 stacked on the first sub-stack 12 located at the material receiving station 14 reaches a preset value of n (n is a positive integer, and n ≥ 1), the two sub-stacks 11 are moved along the first direction so that the first sub-stack 12 is located at one side of the material receiving station 14, and the second sub-stack 13 is located at the material receiving station 14; at this time, the n+1th composite sheet 400 falls onto the bearing surface 111 of the second sub-stack 13 when the first sub-stack 12 moves. Fig.15 As the composite sheet 400 continuously falls into the first sub-stack platform 12, the lifting mechanism 113 of the first sub-stack platform 12 drives the supporting plate 112 of the first sub-stack platform 12 to continuously descend, so that the composite sheet 400 from the material guiding mechanism 300 has a consistent falling height.

[0189] When at least one composite sheet 400 is located on the supporting surface 111 of the second stacking platform 1, the portion of the diaphragm 30 located between the first sub-stack 12 and the second sub-stack 13 is cut off by the cutting mechanism 15. Fig.16 shown.

[0190] It can be understood that after the portion of the diaphragm 30 between the first sub-stack 12 and the second sub-stack 13 is cut off, the composite sheet 400 stacked on the first sub-stack 12 is transferred to the next station; at the same time, the composite sheet 400 continues to be stacked on the second sub-stack 13, as shown in FIG. Fig.17 When the number of composite sheets 400 stacked on the second sub-stack 13 reaches a preset value n, the two sub-stacks 11 are moved simultaneously in opposite directions, so that the second sub-stack 13 is located on one side of the material receiving station 14, and the 2n+1th composite sheet 400 falls onto the carrying surface 111 of the first sub-stack 12 during the movement of the second sub-stack 13. At this time, the first sub-stack 12 is located at the material receiving station 14 for receiving materials, as shown in FIG. Fig.18 As the composite sheet 400 continuously falls into the second sub-stack 13, the lifting mechanism 113 of the second sub-stack 13 drives the supporting plate 112 of the second sub-stack 13 to continuously descend, so that the composite sheet 400 from the material guiding mechanism 300 has a consistent falling height.

[0191] Then, the portion of the diaphragm 30 between the first sub-stack 12 and the second sub-stack 13 is cut by the cutting mechanism 15 .

[0192] In this embodiment, through the above-mentioned lamination method, multiple sub-stacks 11 are arranged in sequence along the first direction, and can be moved along the first direction to be located in the material receiving station 14 in turn, so that the composite material strip A40 carried by the next sub-stack 11 located at the material receiving station 14 can be guided by the movement of the previous sub-stack 11 located at the material receiving station 14. In this way, the position controllability of the composite material strip A40 carried by the sub-stack 11 can be effectively guaranteed, and no additional material guiding operation is required, thereby improving the stacking efficiency of the laminated electrode assembly.

[0193] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A lamination table, characterized in that: include: A plurality of sub-stacks are sequentially arranged along a first direction, the sub-stacks having a bearing surface for bearing the composite material strip A; the plurality of sub-stacks have a common material receiving station; the plurality of sub-stacks are moved along the first direction so that the plurality of sub-stacks are positioned at the material receiving station in turn; A cutting mechanism is configured to cut the composite material strip A at a location between two adjacent sub-stacks.

2. The lamination table according to claim 1, characterized in that: The sub-stack comprises: A bearing plate having the bearing surface; A lifting mechanism is connected to the carrying plate, and the lifting mechanism is used to adjust the height position of the carrying surface.

3. The lamination table according to claim 2, characterized in that: The sub-stack further comprises a fixed baffle, the fixed baffle being fixed relative to the lifting mechanism, and the fixed baffles of two sub-stacks adjacent to each other along the first direction are arranged adjacent to each other; Wherein, when the bearing plate is at the lowest position, the fixed baffle is at least partially located on a side of the bearing surface close to the composite material strip A; when the bearing plate is at the highest position, the fixed baffle does not exceed the bearing surface.

4. The lamination table according to claim 3, characterized in that: When the first direction is a straight direction, the sub-stack located at the head and tail positions of the first direction also includes a synchronous baffle. For each of the sub-stacks located at the head and tail positions of the first direction, the synchronous baffle is connected to the supporting plate and is at least partially located on the side of the supporting surface close to the composite material strip A. The synchronous baffle of the sub-stack located at the head and tail positions is arranged away from the sub-stack adjacent thereto.

5. The lamination table according to any one of claims 1 to 4, characterized in that: The cutting mechanism comprises a cutter and a second driving assembly connected to each other, wherein the second driving assembly drives the cutter to reciprocate along a second direction, and the second direction is perpendicular to the bearing surface; The cutter is configured to cut the composite material strip A at a portion between two adjacent sub-stacks.

6. The lamination table according to claim 5, characterized in that: The cutting mechanism further comprises a pressing knife and a third driving assembly, wherein the third driving assembly is connected to the pressing knife and the second driving assembly, and the third driving assembly drives the pressing knife and the second driving assembly to reciprocate along the second direction; Wherein, the pressing knife is configured to press down the composite material strip A located at the material receiving station.

7. The lamination table according to claim 6, characterized in that: The distance between the pressing knife and the edge adjacent to the carrying surface located at the material receiving station is 2 mm to 6 mm.

8. The lamination table according to any one of claims 1 to 4, characterized in that: The stacking platform also includes a transposition drive assembly, which is connected to the plurality of sub-stacking platforms. The transposition drive assembly drives the sub-stacking platform located at the material receiving station to move to one side of the material receiving station, and simultaneously drives another sub-stacking platform to move to the material receiving station.

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

10. The lamination table according to any one of claims 1 to 4, characterized in that: There are two sub-stacking platforms, and the two sub-stacking platforms are reciprocated along the first direction so that the two sub-stacking platforms are located at the material receiving station in turn.

11. A laminating machine, characterized in that: include: A molding device, used for molding the composite material strip A, wherein the composite material strip A comprises a plurality of composite material sheets connected in sequence through a diaphragm; And, a lamination table as claimed in any one of claims 1 to 10; The composite material strip A output by the molding device moves toward the bearing surface along a second direction, and the second direction is perpendicular to the bearing surface.

12. The laminating machine according to claim 11, characterized in that: The forming device comprises: A first feeding mechanism, used for providing a first pole piece; Two diaphragm feeding mechanisms are configured to supply diaphragms to two sides of the first pole piece respectively; A first thermal bonding mechanism, used for heating at least one of the diaphragm and the first pole piece, and pressing the diaphragm and the first pole piece together to form a composite material strip B; Two second feeding mechanisms are configured to supply second pole pieces to both sides of the composite material strip B respectively, and the two second feeding mechanisms supply materials alternately in sequence; The second thermal bonding mechanism is used to heat at least one of the composite material strip and the second pole piece, and to press the second pole piece and the composite material strip B to form a composite material strip A.

13. The laminating machine according to claim 12, characterized in that: The first thermal bonding mechanism includes a first heating component and a first pressing roller component. The first heating component is used to heat the first pole piece, and the first pressing roller component is used to press the diaphragm and the heated first pole piece.

14. The laminating machine according to claim 12, characterized in that: The second thermal bonding mechanism includes a second heating assembly and a second pressing roller assembly, wherein the second heating assembly is used to heat the second pole piece, and the second pressing roller assembly is used to press the composite material strip B and the heated second pole piece; There are two second heating components, which are respectively arranged adjacent to the two discharge ports of the second feeding mechanisms.

15. The laminating machine according to claim 14, characterized in that: The molding device further comprises a heating and heat-insulating component, which is disposed between the second feeding mechanism and the second pressing roller assembly, and is used for heat-insulating the second pole piece which is in contact with the composite material strip B and is heated.

16. The laminating machine according to any one of claims 11 to 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 laminating machine according to any one of claims 11 to 15, characterized in that: The molding device further comprises a diaphragm edge sealing mechanism, which is located between the first thermal composite mechanism and the discharge port of the second feeding mechanism, and is used to connect the two layers of the diaphragm between two adjacent first pole pieces.

18. The laminating machine according to claim 17, characterized in that: The forming device also includes a correcting device, and the portion of the diaphragm located between two adjacent first pole pieces is a spacing portion. The correcting device collects position information of the spacing portion relative to the working end of the diaphragm edge sealing mechanism, and controls the conveying speed of the composite material strip A according to the position information.

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

20. The laminating machine according to any one of claims 11 to 15, characterized in that: The first feeding mechanism includes a first unwinding assembly, a first pole tab die-cutting assembly and a first pole piece cutting assembly; the first unwinding assembly is used to install a first pole piece roll, and the first pole tab die-cutting assembly is used to cut the empty foil area of ​​the first pole piece roll from the first unwinding assembly to form a first pole tab; The first pole piece cutting assembly is used for cutting the first pole piece roll cut by the first pole tab die-cutting assembly to form the first pole piece; and / or, The second feeding mechanism includes a second unwinding assembly, a second pole tab die-cutting assembly, a second pole piece cutting assembly and a second sheet feeding device; the second unwinding assembly is used to install the second pole piece roll, and the second pole tab die-cutting assembly is used to cut the empty foil area of ​​the second pole piece roll from the second unwinding assembly to form a second pole tab; The second pole piece cutting assembly is used for cutting the second pole piece roll cut by the second pole tab die-cutting assembly to form the second pole piece; The second sheet feeding device sequentially feeds the second electrode sheet roll from the second unwinding assembly to the second electrode tab die-cutting assembly, the second electrode sheet cutting assembly and the composite material strip B.

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

22. The laminating machine according to claim 21, characterized in that The material guiding mechanism comprises a plurality of driving roller groups, the plurality of driving roller groups are arranged at intervals along the second direction, each of the driving roller groups comprises two driving rollers arranged at intervals along the first direction, and the distance between the two driving rollers of each driving roller group is used to transmit the composite material strip A; and / or, The material guiding mechanism has a first end facing the bearing surface located at the material receiving station, and the distance between the first end and the bearing surface is 1.5 to 2 center spacings, and the center spacing is the center spacing between two adjacent composite sheets when the composite material strip A is in a flattened state.

23. The laminating machine according to any one of claims 11 to 15, characterized in that: The first feeding mechanism is used to provide negative electrode sheets; the second feeding mechanism is used to provide positive electrode sheets.

24. A lamination method, characterized in that: Applicable to stacking a composite material strip A on a laminating table as claimed in any one of claims 1 to 10, wherein the composite material strip A comprises a plurality of composite sheets connected in sequence by a diaphragm; The lamination method comprises: The composite material strip A is conveyed to the carrying surface of the sub-stack platform located at the material receiving station, and two adjacent composite material sheets are stacked in sequence along a direction perpendicular to the carrying surface; When the number of the composite sheets stacked by the sub-stacking platform located at the material receiving station reaches a preset value, the plurality of sub-stacking platforms are moved along the first direction so that the sub-stacking platform whose carrying surface carries the number of composite sheets reaching the preset value is located at one side of the material receiving station, and another sub-stacking platform is located at the material receiving station; When at least one of the composite sheets falls onto the carrying surface of the sub-stack located at the material receiving station, the portion of the diaphragm located between two adjacent sub-stacks is cut off by the cutting mechanism.

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