Stacking mechanism, production line, and stacked cell manufacturing method

Abstract

The present application discloses a stacking mechanism, a production line, and a stacked cell manufacturing method using the stacking mechanism. The stacking mechanism is used for stacking a stacking roll and electrode sheets to process same to form a cell. The stacking roll comprises a stacking section and a buffering section. The stacking mechanism comprises a stacking platform and a stretching assembly. The stacking platform is provided with a support surface for supporting the stacking section, and is configured to be capable of moving reciprocatingly in a first direction parallel to the support surface. The stretching assembly is used for guiding the buffering section to the stacking platform, and is configured to be capable of moving reciprocatingly in the first direction. The movement direction of stretching assembly is opposite to that of the stacking platform. The stacking mechanism and the production line of the present application can effectively increase the relative movement speed of the stacking platform and the stretching assembly, improve the stacking efficiency, ensure the quality of stacking, reduces the difficulty in motor model selection, and improve the stability of stacking operations.

Description

A lamination mechanism, production line and laminated battery core manufacturing method

[0001] This application is based on and claims priority to Chinese patent applications with application number CN202311777452.6 and application date December 22, 2023, and application number CN202311866682.X and application date December 29, 2023. The entire contents of the applications are hereby introduced as a whole into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a stacking mechanism, a production line, and a method for manufacturing stacked battery cells. Background Art

[0003] The stacking machine uses a Z-shaped stacking method to process laminated battery cells. Specifically, the stacking machine stacks pre-made positive and negative electrode sheets alternately in a Z-shape with separators to form battery cells.

[0004] In the related art, during the lamination process, the laminating machine utilizes the reciprocating motion of the stacking table or the film pulling assembly to realize the Z-shaped swing of the diaphragm. In order to improve the lamination efficiency, when the stacking table motion method is adopted, the stacking table motion speed needs to be increased, so the requirements for the motor used to drive the stacking table motion are high, which will lead to difficulties in motor selection and increase costs. In addition, because the stacked battery cells are located on the stacking table, when the stacking table motion speed and acceleration increase, the battery cells will slip between the pole pieces during the stacking action, resulting in an excessive degree of lamination alignment. When the film pulling assembly motion method is adopted, in order to maintain the rigidity of the film pulling assembly itself, the weight of the film pulling assembly needs to be increased, which will also lead to difficulties in motor selection and increase the driving cost.

[0005] During the operation of the stacking table, the stacking table itself is quite heavy, making it difficult to find a suitable and low-cost power source to increase its movement speed. Furthermore, because the stacked cells are located on the stacking table, when the stacking table's movement speed and acceleration increase, the cells slip between the poles during the operation, resulting in poor alignment of the stacked cells. Therefore, it is currently difficult to further increase the stacking table's movement speed, which in turn makes it difficult to further improve the production efficiency of stacked cells.

[0006] Application Contents

[0007] This application proposes a lamination mechanism and production line to address the technical issues of difficulty in selecting motors and pole piece slippage during lamination. This application also proposes a method for manufacturing laminated battery cells to improve the production efficiency of laminated battery cells.

[0008] In a first aspect, an embodiment of the present application provides a lamination mechanism for laminating a laminated coil and a pole piece to form a battery cell. The laminated coil includes a laminate segment and a buffer segment. The lamination mechanism includes:

[0009] a lamination table comprising a support surface for supporting the lamination segments, the lamination table being configured to reciprocate along a first direction parallel to the support surface;

[0010] a film pulling assembly, used for guiding the buffer segment to the laminating table, the film pulling assembly being configured to be capable of reciprocating along the first direction;

[0011] Wherein, the film pulling assembly and the lamination table move in opposite directions.

[0012] A second embodiment of the present application proposes a production line, comprising the stacking mechanism as described in the above embodiment.

[0013] A third aspect of the present application provides a method for manufacturing a laminated battery cell, which is implemented by a lamination mechanism, wherein the lamination mechanism includes a lamination table, a first lamination arm, a second lamination arm, a discharge device, and a film pulling assembly. The lamination table and the film pulling assembly are capable of reciprocating between a first lamination position and a second lamination position. The first lamination position and the second lamination position are sequentially spaced apart along the first direction. The first lamination arm is disposed at the first lamination position, and the second lamination arm is disposed at the second lamination position. The discharge device is used to release the diaphragm, and the film pulling assembly is disposed on the upper side of the lamination table.

[0014] The method for manufacturing a laminated battery cell includes the following steps: the lamination table moves along the first direction to the second lamination position, the film pulling assembly moves along the second direction and makes the diaphragm adhere to the positive electrode sheet on the lamination table, and the second direction is opposite to the first direction; when the lamination table moves to the second lamination position, the second lamination hand places the negative electrode sheet on the lamination table; the lamination table moves along the second direction to the second lamination position, the film pulling assembly moves along the first direction and makes the diaphragm adhere to the negative electrode sheet on the lamination table; when the lamination table moves to the first lamination position, the first lamination hand places the positive electrode sheet on the lamination table.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] In the technical solution of the present application, the lamination mechanism includes a lamination table and a film-pulling assembly. Compared with the prior art solution that only uses the lamination table or the film-pulling assembly to reciprocate along the first direction to perform the lamination operation. The lamination table of this solution can reciprocate along the first direction parallel to the support surface, and the film-pulling assembly can reciprocate along the first direction, and the movement direction of the film-pulling assembly is opposite to that of the lamination table, that is, this solution can effectively increase the relative speed between the lamination table and the film-pulling assembly. Therefore, under the condition that the motor drive power is constant, the lamination efficiency of the lamination mechanism of this solution is higher. Under the condition that the preset lamination speed is constant, the lamination mechanism of this solution has lower power requirements for the drive motor, that is, it can effectively reduce the difficulty of motor selection and save costs. Furthermore, the present solution has lower requirements for the movement speed and movement acceleration of the lamination table, thereby reducing the situation where the pole piece slips in the lamination table and preventing the lamination alignment from being out of tolerance. In addition, the present solution can also reduce the rigidity requirements for the film-pulling assembly and reduce the driving cost of the film-pulling assembly. Moreover, since the stacking table and the film-pulling assembly move together, this solution can also change the movement path of the stacked coil, reduce its speed and acceleration convexity, ensure the stability of the stacked coil tension control, and thus improve the stability of the stacking operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] FIG1 is a schematic diagram of a lamination mechanism in a first embodiment of the present application; wherein the lamination mechanism is at time T0, and the film pulling assembly is at a first extreme position;

[0019] FIG2 is a schematic diagram of the lamination mechanism in the first embodiment of the present application; wherein the lamination mechanism is at time T1, along the second direction, the film pulling assembly and one end of the lamination platform along the first direction coincide with each other;

[0020] FIG3 is a schematic diagram of the lamination mechanism in the first embodiment of the present application; wherein the lamination mechanism is at time T2, along the second direction, the film pulling assembly overlaps with the fixing portion;

[0021] FIG4 is a schematic diagram of the lamination mechanism in the first embodiment of the present application; wherein the lamination mechanism is at time T3, and the film pulling assembly is at the second extreme position;

[0022] FIG5 is a schematic structural diagram of the lamination mechanism in the first embodiment of the present application;

[0023] FIG6 is a schematic structural diagram of the lamination mechanism in the first embodiment of the present application along another direction;

[0024] FIG7 is a schematic diagram of a lamination mechanism in the prior art; wherein the lamination mechanism is at time T0, and the film pulling assembly is at the first extreme position;

[0025] FIG8 is a schematic diagram of a laminating mechanism in the prior art; wherein, the laminating mechanism is at time T1, along the second direction, the film pulling assembly coincides with one end of the laminating platform along the first direction;

[0026] FIG9 is a schematic diagram of a lamination mechanism in the prior art; wherein the lamination mechanism is at time T2, along the second direction, the film pulling assembly overlaps with the fixing portion;

[0027] FIG10 is a schematic diagram of a lamination mechanism in the prior art; wherein the lamination mechanism is at time T3 and the film pulling assembly is at the second extreme position;

[0028] FIG11 is a schematic diagram of the lamination mechanism in the third embodiment of the present application when the lamination table is in the middle position;

[0029] FIG12 is a schematic diagram of the stacking mechanism of the stacking table in the first stacking position in the third embodiment of the present application;

[0030] FIG13 is a schematic diagram of the stacking mechanism of the stacking platform in the second stacking position in the third embodiment of the present application.

[0031] Explanation of the reference numerals in Figures 1-10: Laminating mechanism 10; Laminating table 100; Support surface 110; Film pulling assembly 200; First pair of rollers 210; First gap 211; Second pair of rollers 220; Second gap 221; Laminating coil 20; Laminating segment 201; Cache segment 202; Cache assembly 300; First fixed roller 310; First movable roller 320; Axis 321; First driving unit 400; Second driving unit 500; Sliding assembly 600; Slider 610; Slide rail 620; First limit member 621; Second limit member 622; Third driving unit 700; Fixed unit 800; Second fixed roller 810; Third fixed roller 820; Third gap 830; First direction X; Second direction Y; Third direction Z.

[0032] Explanation of the reference numbers in Figures 11-13: 1. Stacking table; 2. First stacking arm; 3. Second stacking arm; 4. Unloading device; 5. Film pulling assembly; 51. First double-roller mechanism; 52. Second double-roller mechanism; 53. Rotating roller; 6. Pressing knife device; 7. Diaphragm; 8. First stacking position; 9. Second stacking position.

[0033] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0036] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0037] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0038] First embodiment:

[0039] The first embodiment of the present application proposes a lamination mechanism 10, which is used to stack a laminated coil 20 and a pole piece to form a battery cell. The laminated coil 20 includes a laminate segment 201 and a buffer segment 202. It should be noted that the laminate segment 201 is the coil segment for lamination on the lamination table 100, and the buffer segment 202 is the coil segment cached on the buffer assembly 300. During the unwinding process of the buffer assembly 300, the buffer segment 202 can be guided to the lamination table 100 to become the laminate segment 201.

[0040] 1 to 6 , the lamination mechanism 10 according to an embodiment of the present application will be described. Specifically, the lamination mechanism 10 includes a lamination table 100 and a film pulling assembly 200 .

[0041] The laminating table 100 is used for laminating. The laminating table 100 includes a support surface 110 for supporting the laminating segments 201. The specific size of the support surface 110 can be determined based on actual conditions. To facilitate description and understanding of the specific movement of the laminating table 100, a first direction X is defined. The laminating table 100 is configured to reciprocate along the first direction X parallel to the support surface 110, thereby performing the laminating operation. Using the orientation shown in Figure 5 as a reference, the first direction X can be a left-right direction, meaning that the laminating table 100 can reciprocate along the left-right direction.

[0042] The film pulling assembly 200 is used to guide the buffer section 202 of the laminated coil 20 to the laminating table 100. The film pulling assembly 200 is configured to reciprocate along a first direction X. With reference to the orientation in FIG5 , the film pulling assembly 200 can reciprocate along the left and right directions.

[0043] It should be noted that the film-pulling assembly 200 and the laminating table 100 move in opposite directions. Referring to the orientation shown in FIG. 5 , in some embodiments, when the film-pulling assembly 200 moves from left to right, the laminating table 100 moves from right to left. In other embodiments, when the film-pulling assembly 200 moves from right to left, the laminating table 100 moves from left to right.

[0044] In the technical solution of the present application, the laminating mechanism 10 includes a laminating table 100 and a film pulling assembly 200. Compared with the prior art, which only utilizes the laminating table 100 or the film pulling assembly 200 to reciprocate along the first direction X to perform the laminating operation. The laminating table 100 of this solution can reciprocate along the first direction X parallel to the support surface 110, and the film pulling assembly 200 can reciprocate along the first direction X, and the movement direction of the film pulling assembly 200 is opposite to that of the laminating table 100, that is, this solution can effectively increase the relative speed between the laminating table 100 and the film pulling assembly 200. Therefore, under the condition that the motor driving power is constant, the laminating efficiency of the laminating mechanism 10 of this solution is higher. Under the condition that the preset laminating speed is constant, the laminating mechanism 10 of this solution has lower power requirements for the driving motor, that is, it can effectively reduce the difficulty of selecting the motor and save costs. Furthermore, this solution requires lower speed and acceleration for the lamination table 100, thereby reducing slippage of the pole pieces within the lamination table 100 and preventing lamination misalignment. Furthermore, this solution can reduce the rigidity requirements for the film pulling assembly 200, thereby lowering the drive cost of the film pulling assembly 200. Furthermore, because the lamination table 100 and the film pulling assembly 200 move together, this solution can also change the motion path of the laminated coil, reducing its speed and acceleration fluctuations, ensuring the stability of the tension control of the laminated coil 20, and thus improving the stability of the lamination operation.

[0045] With reference to Figures 7 to 10, the applicant makes the following analysis and explanation of the motion process of the existing lamination mechanism 10, which adopts the reciprocating motion of the film pulling assembly 200 and is provided with a single buffer assembly 300. This analysis takes a single lamination process as an example. Assume that: the acceleration of the film pulling assembly 200 is a; t is the time for the lamination table 100 to move from the first extreme position to the second extreme position; T is the total cycle of the motion of the film pulling assembly 200; S is the total stroke of the motion of the film pulling assembly 200. It should be noted that this analysis process sets the unwinding to be uniform, and does not consider the following factors: wind resistance, deformation of the diaphragm (laminated coil 20), acceleration, separation of the diaphragm from the roller, acceleration fluctuations of the diaphragm unwinding, the knife pressing action of the lamination table 100, wind resistance, slippage between the roller and the diaphragm, etc.

[0046] It should be noted that in the description of this article, with the orientation in Figure 1 as a reference, L1 is the horizontal distance from the left edge of the stacking table 100 to the film pulling assembly 200 (center of the double rollers) along the first direction X; L2 is the horizontal distance from the fixing part 800 (center of the double rollers) to the film pulling assembly 200 (center of the double rollers) along the first direction X; H1 is the vertical distance from the stacking table 100 to the film pulling assembly 200 (center of the double rollers) along the second direction Y; H2 is the vertical distance from the fixing part 800 (center of the double rollers) to the film pulling assembly 200 (center of the double rollers) along the second direction Y.

[0047] Referring to Figures 7 and 8, from T0 to T1, during this process, the film pulling assembly 200 moves rightward, shortening the length of the strip between the buffer assembly 300 and the laminating table 100. At this time, the first movable roller 320 of the buffer assembly 300 moves rightward. During this process, the change in strip length caused by the rightward movement of the film pulling assembly 200 is completely absorbed or released by the buffer assembly 300. During the T0-T1 process:

[0048] Among them, S 缓 : Cache component location, m; V 放 : diaphragm unwinding speed, m / s;

[0049] Referring to Figures 8 and 9, from T1 to T2, during this process, the film pulling assembly 200 continues to move to the right, and the length of the strip between the buffer assembly 300 and the lamination table 100 begins to lengthen. The strip below the film pulling assembly 200 becomes longer, and the strip above the film pulling assembly 200 becomes shorter. At this time, the buffer assembly 300 slowly moves to the left. During this process, the change in strip length caused by the rightward movement of the film pulling assembly 200 is completely absorbed or released by the buffer. During T1-T2:

[0050] Among them, S 缓 : Cache assembly (first moving roller) position, m; V 放: diaphragm unwinding speed, m / s; S1: cache location at time T1, m;

[0051] Referring to Figures 3 and 4, from T2 to T3, the film pulling assembly 200 continues to move rightward, and the length of the material strip between the buffer assembly 300 and the lamination table 100 begins to increase. The material strip below the film pulling assembly 200 increases in length, and the material strip above the film pulling assembly 200 increases in length. At this time, the buffer assembly 300 moves rapidly to the right. In this process, the change in the length of the material strip caused by the rightward movement of the film pulling assembly 200 is completely absorbed or released by the buffer assembly 300. During T2-T3:

[0052] Among them, S 缓 : Cache axis position, m; V 放 : diaphragm unwinding speed, m / s; S2: cache position at time T2, m; S: total movement stroke of the film pulling axis, m.

[0053] The motion of the conventional lamination mechanism described above shows that the maximum acceleration of the cache shaft of the cache assembly occurs at time T1-T2, and at this time, the film pulling assembly is in the reversing phase, and the acceleration of the film pulling assembly reaches its maximum. This puts significant pressure on the cache motor and cache assembly. Therefore, the applicant considered providing a multi-level cache for the lamination mechanism to address these issues.

[0054] With reference to Figures 1 to 4, the applicant makes the following analysis and explanation of the movement process of the laminating mechanism 10 of one embodiment of the present application, and the analysis takes a single laminating process as an example. Assume that: the acceleration of the film pulling assembly 200 is a, t is the time for the laminating platform 100 to move from the first extreme position to the second extreme position; T is the total cycle of the movement of the film pulling assembly 200; S is the total stroke of the movement of the film pulling assembly 200. It should be noted that the analysis process sets the unwinding of the cache assembly 300 to be uniform, and does not consider the following factors: wind resistance, deformation of the diaphragm (laminated coil 20), acceleration, separation of the diaphragm from the roller, acceleration fluctuation of the diaphragm unwinding, the knife action of the laminating platform 100, wind resistance, slippage between the roller and the diaphragm (laminated coil 20), etc.

[0055] Referring to Figures 1 and 2, from T0 to T1, during the process, the film pulling assembly 200 moves to the right, and the length of the strip between the buffer assembly 300 and the lamination table 100 becomes shorter. At this time, the buffer assembly 300 moves to the right. During this process, the change in strip length caused by the rightward movement of the film pulling assembly 200 is completely absorbed or released by the buffer assembly 300. During T0-T1:

[0056] Among them, S 缓 : Cache assembly (first moving roller) position, m; V 放: unwinding speed of the diaphragm (laminated coil), m / s; N: number of buffer rollers of the buffer assembly; A: acceleration of the lamination table movement.

[0057] Referring to Figures 2 and 3, from T1 to T2, during this process, the film pulling assembly 200 continues to move to the right, and the length of the material strip between the buffer assembly 300 and the lamination table 100 begins to increase. The material strip below the film pulling assembly 200 increases in length, while the material strip above the film pulling assembly 200 decreases in length. At this time, the buffer assembly 300 slowly moves to the left. During this process, the change in material strip length caused by the rightward movement of the film pulling assembly 200 is completely absorbed or released by the buffer assembly 300. During T1-T2:

[0058] Among them, S 缓 : Cache component location, m; V 放 : diaphragm unwinding speed, m / s; S1: position of the cache assembly at time T1, m; N: number of cache rollers of the cache assembly; A: acceleration of the stacking table movement.

[0059] Referring to Figures 3 and 4, from T2 to T3, during this process, the film pulling assembly 200 continues to move rightward and decelerates, the laminating table 100 continues to move rightward and decelerates, and the length of the strip between the buffer assembly 300 and the laminating table 100 continues to lengthen. At this time, the buffer assembly 300 moves rapidly to the right. In this process, the change in strip length caused by the rightward movement of the film pulling assembly 200 is completely absorbed or released by the buffer assembly 300. During T2-T3:

[0060] Among them, S 缓 : Cache component location, m; V 放 : diaphragm unwinding speed, m / s; S2: position of the cache assembly at time T2, m; S: total movement stroke of the film pulling assembly, m; N: number of cache rollers of the cache assembly; A: acceleration of the stacking table movement.

[0061] From the above movement process of the stacking mechanism 10 of an embodiment of the present application, it can be known that the movement curve of the first movable roller 320 of the cache assembly 300 is related to N (the number of cache rollers of the cache assembly 300), a (acceleration of the film pulling assembly 200), and A (acceleration of the movement of the stacking platform 100). After setting up N-level caches, the speed and position changes of the cache shaft of the cache assembly 300 are inversely proportional to the number of cache rollers, thereby effectively reducing the pressure on the cache assembly 300 motor and the cache assembly 300. Furthermore, after the stacking platform 100 and the film pulling shaft move simultaneously, the maximum speed and maximum acceleration position of the cache shaft (first movable roller 320) of the cache assembly 300 at time T1-T2 can be changed by adjusting the acceleration A of the stacking platform 100 to change the movement curve of the cache shaft, which can make the movement curve of the cache shaft smoother, thereby ensuring the stability of the stacking operation.

[0062] 1 and 5 , in some embodiments, the lamination mechanism 10 includes a plurality of cache assemblies 300, and the specific number of cache assemblies 300 may be determined according to actual conditions. Each cache assembly 300 includes a first fixed roller 310 and a first movable roller 320. It can be understood that the axis 321 of the first fixed roller 310 can be arranged parallel to the axis 321 of the first movable roller 320. It should be noted that the axis 321 of each roller body of the cache assembly 300 can be perpendicular to the first direction X. Alternatively, each cache assembly 300 can be arranged relative to and spaced apart along the second direction Y.

[0063] The buffer section 202 of the laminated web 20 is at least partially wound around the first fixed roller 310 and the first movable roller 320, thereby tensioning the buffer section 202 and enabling winding or unwinding operations. When the laminating platform 100 and the film-pulling assembly 200 approach each other in the first direction X, the first movable roller 320 approaches the first fixed roller 310 in the first direction X. With reference to the orientation in Figure 1 , when the laminating platform 100 and the film-pulling assembly 200 approach each other in the left-right direction, that is, when the first movable roller 320 approaches the first fixed roller 310 in the left-right direction, an unwinding operation can be achieved.

[0064] With reference to Figures 1, 5 and 6, the specific arrangement of the film-pulling assembly 200 is described below. To facilitate the description and understanding of the structural arrangement of the film-pulling assembly 200, a second direction Y is defined. In some embodiments, the film-pulling assembly 200 includes a first pair of rollers 210 and a second pair of rollers 220 arranged relative to each other along the second direction Y. The second direction Y is perpendicular to the first direction X. With reference to the orientation in Figure 5, the first pair of rollers 210 and the second pair of rollers 220 are arranged in the up-down direction. It should be noted that the first pair of rollers 210 and the second pair of rollers 220 can be either unpowered rollers or powered rollers. Some embodiments of the present application are described by taking the example that the first pair of rollers 210 and the second pair of rollers 220 are both unpowered rollers.

[0065] Referring to Figure 1 , a first gap 211 is defined between the first and second rollers of the first pair of rollers 210. A second gap 221 is defined between the third and fourth rollers of the second pair of rollers 220. It is understood that the first gap 211 and the second gap 221 can be the same size or different in size. The laminated segments 201 of the laminated web 20 can pass through the first gap 211 of the first pair of rollers 210 and the second gap 221 of the second pair of rollers 220, meaning that the film-pulling assembly 200 can drive the laminated web 20 to move stably along a specific path.

[0066] 5 , in some embodiments, the lamination mechanism 10 further includes a first drive unit 400. The first drive unit 400 is connected to the film-pulling assembly 200. In some embodiments, the first drive unit 400 can be directly connected to the film-pulling assembly 200. In other embodiments, the first drive unit 400 can also be indirectly connected to the film-pulling assembly 200, that is, the first drive unit 400 can drive an intermediate component, which drives the film-pulling assembly 200 to move. The specific driving method of the first drive unit 400 can be determined according to actual conditions. The first drive unit 400 can drive the film-pulling assembly 200 to reciprocate along the first direction X, thereby laying the laminated segment 201 on the support surface 110.

[0067] 5 , in some embodiments, the lamination mechanism 10 further includes a second drive unit 500 connected to the lamination platform 100. Specifically, in some embodiments, the second drive unit 500 may be directly connected to the lamination platform 100. In other embodiments, the second drive unit 500 may be indirectly connected to the lamination platform 100, that is, the second drive unit 500 may drive a connecting member, which drives the lamination platform 100 to reciprocate along the first direction X. The second drive unit 500 is adapted to drive the lamination platform 100 to reciprocate along the first direction X, thereby placing the laminated segments 201 on the support surface 110.

[0068] Referring to Figure 6 , in some embodiments, the lamination mechanism 10 further includes a sliding assembly 600, which is used to drive the lamination platform 100. The sliding assembly 600 includes a slider 610 and a slide rail 620, which are interconnected. Specifically, in some embodiments, the slider 610 includes a slide groove, and the slide rail 620 includes a protrusion. The protrusion can be inserted into the slide groove to enable the slider 610 to slide on the slide rail 620. In this embodiment, the slider 610 is connected to the lamination platform 100, that is, the slider 610 can drive the lamination platform 100 to slide on the slide rail 620 to achieve the lamination operation and ensure the stability of the lamination.

[0069] 6 , in some embodiments, a first stopper 621 and a second stopper 622 are provided on a slide rail 620 to limit the sliding range of the slider 610. The first stopper 621 and the second stopper 622 are arranged opposite each other and spaced apart along a first direction X. The first stopper 621 and the second stopper 622 may be configured the same or differently, depending on the actual situation.

[0070] It should be noted that the sliding assembly 600 is configured to have a first extreme position and a second extreme position. Referring to Figure 1 , in the first extreme position, the slider 610 abuts the first limiter 621, thereby limiting the range of motion of the slider 610 and stably maintaining the lamination platform 100 in the first extreme position. At this point, the film pulling assembly 200 is positioned to one side of the lamination platform 100 along the first direction X, facilitating the lamination press blades of the lamination mechanism 10 to press the pole piece or lamination segment 201.

[0071] Referring to Figure 4 , in the second limit position, the slider 610 abuts the second stopper 622. Therefore, the second stopper 622 can limit the range of motion of the slider 610, thereby stably maintaining the lamination platform 100 in the second limit position. At this point, the film pulling assembly 200 is located on the other side of the lamination platform 100 along the first direction X, facilitating the lamination pressing blades of the lamination mechanism 10 to press the pole piece or lamination segment 201.

[0072] 5 , in some embodiments, the lamination mechanism 10 further includes a third drive unit 700. To facilitate description and understanding of the movement process of the cache assembly 300, a third direction Z is defined. The third direction Z is perpendicular to the first direction X. With reference to the orientation in FIG5 , the third direction Z is the front-to-back direction. The third drive unit 700 connects each cache assembly 300, and each first movable roller 320 has an axis 321 extending along the third direction Z. The third drive unit 700 can drive each first movable roller 320 to rotate around each axis 321 to guide the cache segment 202 to the lamination table 100. After setting up a multi-level cache, this solution can reduce the pressure on the cache assembly 300, that is, it can reduce the difficulty of selecting the third drive unit 700 and reduce costs. In addition, it can also reduce the movement speed and movement acceleration of the laminated coil 20, effectively reduce the inertia force of the roller, and greatly reduce the tension fluctuation of the laminated coil 20.

[0073] 1 , 5 and 6 , in some embodiments, the lamination mechanism 10 includes a fixing portion 800, and the fixing portion 800 includes a second fixed roller 810 and a third fixed roller 820 arranged opposite to each other. A third gap 830 is provided between the second fixed roller 810 and the third fixed roller 820, and the buffer section 202 is provided with the third gap 830. It can be understood that the third gap 830 can be equal in size to the first gap 211 and the second gap 221 mentioned above. It should be noted that the second fixed roller 810 and the third fixed roller 820 can be arranged at intervals along the first direction X. The provision of the fixing portion 800 in this solution can enhance the stability of the tension control of the lamination coil 20, and ensure that the lamination operation can be carried out continuously and stably.

[0074] Second embodiment:

[0075] The second embodiment of the present application proposes a production line, which includes a lamination mechanism 10 as described in the above embodiment. The production line of this solution can effectively increase the relative speed between the lamination table 100 and the film pulling assembly 200, improve the lamination efficiency, and can also effectively reduce the difficulty of motor selection, save costs, and reduce the slippage of the pole pieces in the lamination table, prevent the lamination alignment from being out of tolerance, and ensure the yield rate of the battery cell. In addition, this solution can also change the movement path of the lamination coil, reduce its speed and acceleration convexity, ensure the stability of the tension control of the lamination coil 20, and thus improve the stability of the lamination operation.

[0076] Third embodiment:

[0077] The third embodiment of the present application provides a method for manufacturing laminated battery cells. This method is implemented using a laminating mechanism. Figures 11 to 13 illustrate the laminating mechanism used in the laminated battery cell manufacturing method of the third embodiment of the present application. Referring to Figures 11, 12, and 13, the laminating mechanism includes a laminating table 1, a first laminating arm 2, a second laminating arm 3, a discharge device 4, and a film pulling assembly 5. A first laminating position 9 and a second laminating position 9 are provided on either side of the laminating table 1. The first laminating position 8, the laminating table 1, and the second laminating position 9 are arranged sequentially along a first direction. The laminating table 1 reciprocates between the first laminating position 8 and the second laminating position 9. The first laminating arm 2 is located on one side of the first laminating position 8, and the second laminating arm 3 is located on the other side of the second laminating position 9. When the laminating table 1 moves to the first laminating position 8, the first laminating arm 2 stacks the electrodes onto the laminating table 1. When the laminating table 2 moves to the second laminating position 9, the second laminating arm 3 stacks the electrodes onto the laminating table 1. The discharge device 4 and the film pulling assembly 5 are arranged in sequence along the feeding direction of the diaphragm 7. The film pulling assembly 5 is located on the upper side of the stacking table 1. The diaphragm 7 released by the discharge device 4 passes through the film pulling assembly 5. Whenever the first stacking hand 2 / the second stacking hand 3 stacks the pole pieces on the stacking table 1, the diaphragm 7 is pulled by the film pulling assembly 5 to cover the pole pieces to separate the adjacent stacked pole pieces.

[0078] In the embodiment of the present application, the first stacking arm 2 and / or the second stacking arm 3 are not particularly limited as long as they can stack the pole pieces on the stacking table. For example, the first stacking arm 2 is a robot arm that can adsorb the pole pieces, and after adsorbing and fixing the pole pieces, it moves the pole pieces and places them on the stacking table 1, and aligns the edges of the pole pieces when placing the pole pieces.

[0079] In the embodiment of the present application, the stacking table 1 moves toward the side opposite to the movement direction of the diaphragm 7 during the process of the membrane pulling assembly 5 pulling out the diaphragm 7 to improve the stacking efficiency. For the specific action method, please refer to the description of the working principle of the stacking mechanism below.

[0080] Referring to Figures 11-13, the laminating mechanism operates as follows: As shown in Figure 11, the laminating mechanism is in its starting position at time T0. As shown in Figure 12, the laminating table 1 moves in the second direction to the first laminating position 8, while the film pulling assembly 5 simultaneously moves in the first direction, where the first and second directions are opposite. This is time T1 for the laminating mechanism. At time T1, the first laminating arm 2 stacks the electrodes on the laminating table 1. After the electrodes are stacked, as shown in Figure 13, the laminating table 1 moves in the first direction to the second laminating position 9. Simultaneously, the laminating table 1 moves in the second direction, which is time T2. At time T2, the second laminating arm 3 stacks the electrodes. During the electrode stacking process, the laminating mechanism switches back and forth between times T1 and T2. The length of the diaphragm 7 to be pulled out during the electrode stacking process is fixed at S, which is equal to the displacement S1 of the laminating table 1 from time T1 to time T2 plus the displacement S2 of the film pulling assembly 5. The average displacement speed of the stacking table 1 is V1, the average displacement speed of the film pulling assembly 5 is V2, the time it takes for the stacking mechanism to switch from T1 to T2 is t, and the speed at which the film pulling assembly 5 pulls the diaphragm 7 is (V1 + V2). Therefore, t(V1 + V2) = S. Therefore, while the diaphragm 7 length S and the average displacement speed V1 of the stacking table 1 remain unchanged, the average displacement speed V2 of the film pulling assembly 5 reduces the time t it takes for the stacking mechanism to switch from T1 to T2.

[0081] Referring to Figure 13, when the stacking table 1 moves to the second stacking position 9, the second stacking hand 3 places the negative electrode sheet on the stacking table 1; when the stacking table 1 moves along the first direction, the film pulling assembly 5 moves along the second direction and causes the diaphragm 7 to adhere to the positive electrode sheet on the stacking table 1. When the stacking table 1 moves along the second direction, the film pulling assembly 5 moves along the first direction and causes the diaphragm 7 to adhere to the negative electrode sheet on the stacking table 1. In the specific stacking process, the diaphragm 7 is released by the discharge device 4 and adhered to the stacking table 1 after being guided by the film pulling assembly 5. The stacking table 1 moves toward the first stacking position 8, and the film pulling assembly 5 moves toward the second stacking position 9. At the first stacking position 8, the first stacking hand 2 places the positive electrode sheet on the stacking table 1 and presses down the diaphragm 7. After placing the positive electrode sheet, the stacking table 1 moves to the second stacking position 9, and the film pulling assembly 5 moves to the first stacking position 8. At this time, due to the change in the relative position of the stacking table 1 and the film pulling assembly 5, the diaphragm 7 is pulled out of the discharge device 4 and attached to the positive electrode sheet.

[0082] After the stacking table 1 reaches the second stacking position 9, the second stacking arm 3 places the negative electrode sheet onto the stacking table 1 and presses the separator 7 between the positive and negative electrode sheets. After the second stacking arm 3 completes the placement of the negative electrode sheet, the stacking table 1 continues to move toward the first stacking position 8, repeating the process to form the desired stacked battery cell. Alternatively, the stacking table 1 can first move to the second stacking position 9 to place the negative electrode sheet, and then move to the first stacking position 8 to place the positive electrode sheet.

[0083] During the lamination process, in order to ensure that the diaphragm 7 is not damaged during lamination, the angle between the diaphragm 7 and the lamination table 1 needs to be limited to a smaller angle when placing the positive or negative electrode sheets, preferably not exceeding 10°. The height between the film pulling assembly 5 and the lamination table 1 remains unchanged, that is, the distance in the third direction remains unchanged. Therefore, it is necessary to ensure that there is a sufficient distance between the film pulling assembly 5 and the lamination table 1 in the first direction to ensure the quality of the diaphragm 7 attached between the positive and negative electrode sheets. That is, a larger distance is required between the film pulling assembly 5 and the lamination table 1 in the first direction, and a larger distance will reduce the lamination speed. Therefore, the lamination table 1 and the film pulling assembly 5 are moved in opposite directions at the same time to perform lamination, thereby improving the lamination efficiency. In the prior art, lamination is performed only by moving the film pulling assembly 5, which not only has a slow lamination speed, but also requires a larger range of movement for the film pulling assembly 5 in the prior art. By simultaneously moving the stacking table 1 and the film pulling assembly 5 in opposite directions, the distance between the first stacking position 8 and the second stacking position 9 can be shortened, so that when the speed of the stacking table 1 remains unchanged, the time spent from the first stacking position 8 to the second stacking position 9 is reduced.

[0084] In the prior art, the film-pulling assembly is immobile, and the film-pulling assembly and the unloading device remain relatively stationary in the first direction. If the distance between the film-pulling assembly 5 and the laminating platform in the first direction is H, the length of the diaphragm that can be pulled out meets the requirements for electrode placement. Therefore, the distance between the first and second laminating positions must be at least 2H. The film-pulling assembly is located between the first and second laminating positions, and the laminating platform must move a distance of 2H from the first to the second laminating position.

[0085] In the present application, since the film pulling assembly can move in the opposite direction relative to the laminating table, if the distance between the film pulling assembly 5 and the laminating table in the first direction is H, the length of the diaphragm pulled out can meet the requirements for placing the pole pieces. Then, the displacement of the laminating table relative to the initial position (i.e., the initial position of the laminating table in FIG11 ) can be less than H. Accordingly, the distance between the first laminating position 8 and the second laminating position 9 is less than 2H, and the distance required for the laminating table to move from the first laminating position to the second laminating position is less than 2H, which is shorter than the distance required in the prior art. Therefore, the laminating efficiency is improved without increasing the speed of the laminating table 1.

[0086] The film drawing assembly 5 includes two double-roller mechanisms, specifically a first double-roller mechanism 51 and a second double-roller mechanism 52. Each of the first double-roller mechanism 51 and the second double-roller mechanism 52 includes two rotating rollers 53 that clamp the membrane 7 on both sides. The membrane 7 passes through the first double-roller mechanism 51 and the second double-roller mechanism 52 in sequence. The first double-roller mechanism 51 and the second double-roller mechanism 52 clamp and guide the membrane 7, so that the membrane 7 has a smaller bending angle at the same position, allowing the membrane 7 to be more smoothly attached to the lamination table 1 after being released from the unloading device 4.

[0087] The first double roller mechanism 51 and the second double roller mechanism 52 are sequentially arranged along the third direction, which is perpendicular to the first direction. When the first double roller mechanism 51, the second double roller mechanism 52 and the laminating table 1 overlap in the third direction, the unloading device 4, the first double roller mechanism 51, the second double roller mechanism 52 and the laminating table 1 are sequentially arranged in the third direction. At this time, after the diaphragm 7 is released from the unloading device 4, it can more smoothly enter the first double roller mechanism 51 and the second double roller mechanism 52 and fit on the laminating table 1 at a smaller angle.

[0088] The film-pulling assembly 5 includes a motor connected to a rotating roller 53. The motor is used to drive the rotating roller 53 to rotate, thereby driving the diaphragm 7 to be transported. The motor provided on the film-pulling assembly 5 to transport the diaphragm 7 prevents the diaphragm 7 from being subjected to excessive tension when pulled by the lamination table 1, thereby protecting the diaphragm 7 from damage. It also allows the diaphragm 7 to be tightened between the film-pulling assembly 5 and the lamination table 1 if it becomes loose.

[0089] The two rotating rollers 53 of the first double-roller mechanism 51 are arranged along the first direction. Specifically, the direction of the axis connecting the two rotating rollers is the first direction. The two rotating rollers 53 of the second double-roller mechanism 52 are arranged along the first direction. The first double-roller mechanism 51 and the second double-roller mechanism 52 are arranged along the third direction, so that the diaphragm 7 is directly arranged along the third direction between the first double-roller mechanism 51 and the second double-roller mechanism 52. Since the two rotating rollers 53 of the first double-roller mechanism 51 are arranged along the first direction, and the two rotating rollers 53 of the second double-roller mechanism 52 are arranged along the first direction, the bending angle of the diaphragm 7 when passing through the first double-roller mechanism 51 and the second double-roller mechanism 52 is smaller.

[0090] When the stacking platform 1 is equidistant from the first stacking position 8 and the second stacking position 9, the unloading device 4, the film pulling assembly 5, and the stacking platform 1 are sequentially arranged along the third direction. Furthermore, when the stacking platform 1 moves to the first stacking position 8, the film pulling assembly 5 moves above the second stacking position 9. This minimizes the movement space, allowing for a smaller angle between the diaphragm 7 and the stacking platform 1 when unloading the film.

[0091] When the first stacking arm 2 places the positive electrode sheet onto the stacking table 1 or the second stacking arm 3 places the negative electrode sheet onto the stacking table 1, the stacking table 1 stops sliding. When the stacking table 1 reaches the first stacking position 8 and the first stacking arm 2 places the sheet, the stacking table 1 stops moving so that the first stacking arm 2 can place the positive electrode sheet onto the stacking table 1 more accurately.

[0092] The stacking table 1 is provided with a knife pressing device 6, which includes a drive mechanism and a knife pressing device. The drive mechanism is used to drive the knife pressing device to switch between a first position and a second position. When the knife pressing device is in the first position, the knife pressing device presses the negative electrode sheet or the positive electrode sheet onto the placement surface of the stacking table 1. When the knife pressing device is in the second position, the knife pressing device is located on a surface of the stacking table 1 adjacent to or opposite to the placement surface. Specifically, in the first position, the knife pressing device 6 presses the positive electrode sheet and the negative electrode sheet more tightly together. In the second position, the knife pressing device 6 is moved away from above the placement surface and is located on a surface adjacent to or opposite to the placement surface, thereby avoiding affecting the first stacking hand 2 and the second stacking hand 3 from placing the sheets onto the stacking table 1.

[0093] The stacking table 1 is provided with two pressing devices 6, namely a positive pressing device 6 and a negative pressing device 6. The positive pressing device 6 is provided on the stacking table 1 near the first stacking hand 2. After the first stacking hand 2 places the positive electrode sheet on the stacking table 1, the positive pressing device 6 switches to the first position and switches to the second position before the stacking table 1 moves to the second stacking position 9. The negative pressing device 6 is provided on the stacking table 1 near the second stacking hand 3. After the second stacking hand 3 places the negative electrode sheet on the stacking table 1, the negative pressing device 6 switches to the first position and switches to the second position before the stacking table 1 moves to the first stacking position 8. After the positive or negative electrode sheet is placed on the stacking table 1, the pressing device 6 presses the sheet, making the positive and negative electrodes fit more tightly together. The specific drive mechanism driving the positive electrode press knife can be provided with a first linear module and a second linear module. The first linear module first drives the positive electrode press knife to move along the third direction. After moving to a position above the topmost electrode sheet on the lamination table 1, the second linear module then drives the positive electrode press knife to move above the lamination table 1. Then, the first positioning module moves along the third direction and presses on the positive electrode sheet, pressing the positive electrode sheet tightly against the lamination table 1, so that the positive and negative electrode sheets are more tightly fitted together. The first linear module and the second linear module can both use linear motors.

Claims

1. A lamination mechanism, used for lamination coils and pole pieces to be stacked to form a battery cell, wherein the lamination coils include lamination segments and buffer segments, characterized in that: The lamination mechanism comprises: A lamination table, comprising a support surface for supporting the lamination segments, the lamination table being configured to be capable of reciprocating along a first direction parallel to the support surface; A film pulling assembly, used for guiding the buffer section to the laminating table, the film pulling assembly being configured to be able to reciprocate along the first direction; Wherein, the film pulling assembly and the laminating table move in opposite directions; The stacking mechanism includes a plurality of cache components, each of which includes a first fixed roller and a first movable roller, and the cache segment is at least partially wound around the first fixed roller and the first movable roller; when the stacking platform and the film pulling assembly approach each other along the first direction, the first movable roller approaches the first fixed roller along the first direction.

2. The lamination mechanism according to claim 1, characterized in that: The film-drawing assembly comprises a first pair of rollers and a second pair of rollers arranged opposite to each other along a second direction, the stacked segments are suitable for passing through a first gap of the first pair of rollers and a second gap of the second pair of rollers, and the second direction is perpendicular to the first direction.

3. The lamination mechanism according to claim 1, characterized in that: The lamination mechanism further includes a first driving unit connected to the film-drawing assembly, and the first driving unit is used to drive the film-drawing assembly to reciprocate along the first direction to lay the lamination segments on the supporting surface.

4. The lamination mechanism according to claim 1, characterized in that: The lamination mechanism further includes a second driving unit connected to the lamination platform, and the second driving unit is adapted to drive the lamination platform to reciprocate along the first direction so as to lay the lamination segments on the support surface.

5. The lamination mechanism according to claim 1, characterized in that: The lamination mechanism further comprises a sliding assembly, wherein the sliding assembly comprises a sliding block and a sliding rail connected to each other, and the sliding block is connected to the lamination platform so that the lamination platform slides on the sliding rail.

6. The lamination mechanism according to claim 5, characterized in that: The slide rail is provided with a first limiting member and a second limiting member, the first limiting member and the second limiting member are arranged opposite to each other and spaced apart along the first direction; The sliding assembly is configured to have a first extreme position and a second extreme position. In the first extreme position, the slider abuts against the first limiting member, and the film pulling assembly is located on one side of the stacking platform along the first direction; in the second extreme position, the slider abuts against the second limiting member, and the film pulling assembly is located on the other side of the stacking platform along the first direction.

7. The lamination mechanism according to claim 1, characterized in that: The stacking mechanism also includes a third driving unit, which is connected to each of the cache components. Each of the first movable rollers has an axis extending along a third direction. The third driving unit is suitable for driving each of the first movable rollers to rotate around the axis to guide the cache segment to the stacking platform. The third direction is perpendicular to the first direction.

8. The lamination mechanism according to claim 1, characterized in that: The lamination mechanism comprises a fixing portion, the fixing portion comprises a second fixed roller and a third fixed roller which are arranged opposite to each other, a third gap is provided between the second fixed roller and the third fixed roller, and the buffer section passes through the third gap.

9. A production line, characterized in that: It comprises a lamination mechanism as described in any one of claims 1 to 8.

10. A method for manufacturing a laminated battery core, characterized in that: The method is applied to the lamination mechanism described in claim 1 and is implemented through the lamination mechanism, wherein the lamination mechanism further comprises: a first lamination arm, a second lamination arm, and a material discharge device; The stacking platform and the film pulling assembly can reciprocate between the first stacking position and the second stacking position, the first stacking position and the second stacking position are sequentially arranged at intervals along the first direction, the first stacking hand is arranged at the first stacking position, the second stacking hand is arranged at the second stacking position, the unloading device is used to release the diaphragm, and the film pulling assembly is arranged on the upper side of the stacking platform; The laminated battery core manufacturing method comprises the following steps: The stacking platform moves along the first direction to the second stacking position, and the film pulling assembly moves along the second direction to make the diaphragm adhere to the positive electrode sheet on the stacking platform, and the second direction is opposite to the first direction; When the stacking platform moves to the second stacking position, the second stacking hand places the negative electrode sheet on the stacking platform; The lamination platform moves along the second direction to the second lamination position, and the film pulling assembly moves along the first direction to make the diaphragm adhere to the negative electrode sheet on the lamination platform; When the stacking platform moves to the first stacking position, the first stacking hand places the positive electrode sheet on the stacking platform.

11. The method for manufacturing a laminated battery core according to claim 10, characterized in that: The film-drawing assembly includes two double-roller mechanisms spaced apart in the vertical direction, each of the double-roller mechanisms includes two rotating rollers distributed in the horizontal direction, the two rotating rollers clamp the membrane, and the membrane passes through the two double-roller mechanisms in sequence.

12. The method for manufacturing a laminated battery core according to claim 10, characterized in that: The film pulling assembly reciprocates between the first lamination position and the second lamination position.

13. The method for manufacturing a laminated battery core according to claim 11, characterized in that: The film-pulling assembly comprises a motor, which is connected to the rotating roller. The motor is used to drive the rotating roller to rotate so that the rotating roller conveys the diaphragm.

14. The method for manufacturing a laminated battery core according to claim 10, characterized in that: The two rotating rollers of the first double-roller mechanism are arranged along the first direction, and the two rotating rollers of the second double-roller mechanism are arranged along the first direction.

15. The method for manufacturing a laminated battery core according to claim 10, characterized in that: When the stacking platform is at an equal distance from the first stacking position and the second stacking position, the unloading device, the film pulling assembly and the stacking platform are located on the same straight line, and the straight line is vertically arranged.

16. The method for manufacturing a laminated battery core according to claim 10, characterized in that: When the first lamination hand places the positive electrode sheet on the lamination table or the second lamination hand places the negative electrode sheet on the lamination table, the lamination table stops moving.

17. The method for manufacturing a laminated battery core according to claim 10, characterized in that: A knife pressing device is arranged on the stacking table, and the knife pressing device includes a driving mechanism and a knife pressing device. When the first stacking hand places the positive electrode sheet on the stacking table, the driving mechanism drives the knife pressing device to press the positive electrode sheet onto the placement surface of the stacking table; when the second stacking hand places the negative electrode sheet on the stacking table, the driving mechanism drives the knife pressing device to press the negative electrode sheet onto the placement surface of the stacking table.

18. The method for manufacturing a laminated battery core according to claim 10, characterized in that: When the stacking platform moves to the first stacking position, the film pulling assembly moves to the second stacking position; when the stacking platform moves to the second stacking position, the film pulling assembly moves to the first stacking position.

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