A rectifying device for photovoltaic cells

Abstract

The application relates to a photovoltaic cell rectifying device, which comprises a cell support mechanism, a cell rectifying mechanism and an arc-shaped rolling surface. The cell has an arc-shaped bending shape on the cell support mechanism. The arc-shaped rolling surface can move on the surface of the cell in an arc-shaped track opposite to the arc-shaped bending shape of the cell, and the cell is bent in the opposite direction of stress bending. The cell surface is rolled by the rolling mechanism which can move on the surface of the cell in an arc-shaped track opposite to the arc-shaped bending shape of the cell. After the cell is rolled, the stress bending part of the cell can be rectified. Compared with the rectifying mode of the prior art, the relative position of the cell center does not change due to the change of the horizontal length of the cell when the cell is bent, so that the cell is stacked, and the cell hidden crack, solder strip bending and other phenomena are avoided.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell manufacturing technology, and in particular to a correction device for photovoltaic cells. Background Technology

[0002] During the production of photovoltaic cells, due to the different materials of the solder ribbon and the cell, BC-type cells are welded on one side only. After the cell and solder ribbon are heated and welded, the cell will curl towards the side with the solder ribbon due to welding stress. This causes each cell in the welded cell string to bend in one direction, so the shape of the cell needs to be corrected. Currently, the correction of the welded cells is mostly done by correcting the entire string. Because the cells bend backward during correction, the spacing between cells in the string changes. At the same time, the solder ribbon between two cells is squeezed, resulting in cell stacking. This can lead to microcracks or cracks in the cells during correction, handling, or lamination. In addition, the correction mechanism mostly uses springs or cylinders and only performs static correction on a fixed position of the cell. The correction form is monotonous, and the surface of the corrected cell often has a wavy shape. Furthermore, different specifications of cells require different tooling for adaptation, which leads to a decrease in production efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a correction device for photovoltaic cells to solve the problem of low correction efficiency in current photovoltaic cells.

[0004] The technical solution of the present invention is that this application provides a photovoltaic cell straightening device, including a cell support mechanism, wherein the cell has an arc-shaped bending shape on the cell support mechanism;

[0005] A cell straightening mechanism is disposed on the side of the arc-shaped bend protrusion near the cell, and includes an arc-shaped rolling surface. The arc-shaped rolling surface can move on the surface of the cell along an arc trajectory opposite to the arc-shaped bend of the cell, bending the cell in the opposite direction of stress bending.

[0006] Preferably, the cell straightening mechanism includes a lateral movement mechanism and a rolling mechanism. The lateral movement mechanism is capable of moving along the first direction, and the rolling mechanism is capable of moving along a second direction that is close to or away from the cell. The lateral movement mechanism and the rolling mechanism move synchronously, thereby driving the rolling surface to roll on the cell along the first direction and the second direction in an arc-shaped path.

[0007] Preferably, the battery cell support mechanism is provided with a bracket mechanism, the bracket mechanism including a pair of support portions spaced apart along the battery cell conveying direction, and a receiving portion between the pair of support portions is configured to accommodate the battery cell in the opposite direction of bending.

[0008] Preferably, the rolling stroke of the rolling surface on the battery cell includes at least one downward trending rolling stroke and one upward trending rolling stroke.

[0009] Preferably, the lowest point of the rolling surface that moves along the second direction is located on the central axis of the accommodating portion along its length.

[0010] Preferably, a battery cell conveying mechanism is provided on one side of the battery cell support mechanism for conveying battery cells along a first direction. The rolling direction of the rolling surface is the same as the conveying direction of the battery cell, and the rolling surface descends along a curve to the lowest point from one end of the battery cell and then rises along a curve to the other end of the battery cell.

[0011] Preferably, the conveying surface of the battery cell support mechanism is provided with at least one material storage area on both sides of the bracket mechanism, wherein at least one of the material storage areas is used to mount the end face of the battery cell as the support part, and the battery cell is moved from the material storage area to the pair of supports.

[0012] Preferably, the support portion includes a first support portion and a second support portion, and the width of the receiving portion formed between the first support portion and the second support portion is smaller than the width of the battery cell.

[0013] Preferably, the bracket mechanism is mounted on the battery cell support mechanism and can be driven by a drive mechanism to reciprocate along a first direction.

[0014] Preferably, the rolling direction of the rolling surface is opposite to the conveying direction of the battery cell, and it descends along a curve from one end of the battery cell to the lowest point and then rises along a curve to the other end of the battery cell.

[0015] Compared with the prior art, the advantages of this application are:

[0016] (1) This application uses a rolling mechanism that can move along an arc trajectory opposite to the arc bending shape of the battery cell to roll the surface of the battery cell, so that the battery cell can correct its own stress bending part after being rolled, and the surface of the battery cell after being corrected by dynamic rolling correction is smoother than that of traditional static correction.

[0017] (2) A accommodating part for reverse bending of the battery cell is left on the battery cell support mechanism, and the battery cell is supported by the bracket mechanism located on both sides of the accommodating part. This not only ensures that the battery cell can be transmitted stably, but also completes the correction action efficiently without affecting the transmission efficiency.

[0018] (3) Configure a downward trending rolling stroke and an upward trending rolling stroke for the rolling surface, and implement them through the same set of drive mechanisms, so that the rolling efficiency is fast enough and the rolling height can be effectively controlled, which can effectively avoid the occurrence of excessive rolling or insufficient rolling stroke. Furthermore, the movement acting on the surface of the cell is rolling, which avoids generating large friction with the surface of the cell and reduces the risk of scratching the cell.

[0019] (4) This application uses a single cell rolling method for correction. Compared with the existing technology of correcting the entire string, it can effectively avoid the phenomenon of cell spacing reduction caused by the change of horizontal length of the cell during recursion and the unchanged relative position of the cell center, or even cell stacking leading to cell microcracks, solder strip bending, etc.

[0020] (5) A conveyor belt and a set of conveyor rollers are used to create two conveyor areas with disconnected conveyor surfaces, which ensures the continuity of conveying power. At the same time, a recessed receiving part can be configured in the conveyor areas with disconnected conveyor surfaces, which saves the space for correction without affecting the conveying power. Attached Figure Description

[0021] The present application will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the overall structure of a photovoltaic cell correction device according to this application;

[0023] Figure 2 This is a schematic diagram of the correction mechanism of a photovoltaic cell correction device according to this application;

[0024] Figure 3 This is a schematic diagram of the support mechanism for a photovoltaic cell straightening device according to this application;

[0025] Figure 4 This is a schematic diagram of the correction direction of a photovoltaic cell correction device according to this application;

[0026] Figure 5 This is a schematic diagram of the correction direction of a photovoltaic cell correction device according to this application;

[0027] Figure 6 This is a schematic diagram of the cell support mechanism of a photovoltaic cell straightening device according to this application;

[0028] Figure 7 This is a schematic diagram of the cell support mechanism of a photovoltaic cell straightening device according to this application;

[0029] Figure 8 This is a schematic diagram of the correction mechanism of a photovoltaic cell correction device according to this application.

[0030] in:

[0031] 1. Cell support mechanism; 11. Conveyor belt; 12. Conveyor roller;

[0032] 2. Cell straightening mechanism; 21. Rolling surface; 22. Transverse movement mechanism; 23. Rolling mechanism; 231. Longitudinal drive mechanism; 232. Pressure roller;

[0033] 3. Battery cells;

[0034] 4. Bracket mechanism; 41. Support part; 42. Receiving part; 43. Material support plate; 411. First support part; 412. Second support part;

[0035] 5. Inter-serial compensation translation module; 51. Drive mechanism; 52. Transmission mechanism; 53. Guide mechanism; 54. Mounting plate. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are merely one embodiment of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] The term "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of the embodiments of this application, it should be understood that the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third," etc., may explicitly or implicitly include one or more of that feature. Furthermore, the terms "first," "second," and "third," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Moreover, the terms "comprising" and "being," and any variations thereof, are intended to cover non-exclusive inclusion. Example 1:

[0038] like Figure 1As shown, this embodiment provides a photovoltaic cell straightening device, including a cell support mechanism 1 and a cell straightening mechanism 2. The cell support mechanism 1 is used to transport cells 3 arranged in strings. During the production process of the photovoltaic cells 3, the cells 3 need to be welded together with welding strips on at least one side. During the welding process, the photovoltaic cells 3 will experience stress bending, usually with the middle higher or lower than the sides in the horizontal direction. Since the photovoltaic cells are arranged in strings during the welding process, the photovoltaic cell straightening device provided in this embodiment receives the photovoltaic cells 3 in strings that are bent. A rolling surface 21 is provided on the cell straightening mechanism 2. The rolling surface 21 approaches the cell 3 and moves along an arc trajectory on the surface of the cell 3, bending the cell 3 in the opposite direction of the welding stress bending, thereby achieving the straightening of the cell 3. Compared with the static straightening in the prior art, the rolling straightening method provided in this embodiment has a better straightening effect, and the surface of the straightened photovoltaic cell does not produce a wavy shape.

[0039] like Figure 2 As shown, the battery cell straightening mechanism 2 includes a lateral movement mechanism 22 and a rolling mechanism 23. In this embodiment, the lateral movement mechanism 22 can move horizontally along a first direction, and the rolling mechanism 23 can move vertically along a second direction. Therefore, driven by the lateral movement mechanism 22 and the rolling mechanism 23, the rolling surface 21 can move along a curved trajectory. When the rolling surface 21 contacts the battery cell 3, this curved trajectory causes the battery cell to perform a reverse curling action. In one rolling stroke, the rolling surface 21 always contacts the surface of the battery cell 3 and performs a rolling and pressing forward movement on the surface of the battery cell. This not only causes the surface of the battery cell to bend in the opposite direction, but also ensures that the friction of the rolling surface 21 on the surface of the battery cell is small enough, reducing the relative movement between the straightening workpiece and the battery cell, avoiding the risk of scratching the battery cell, and preventing the appearance of wavy patterns.

[0040] like Figure 3As shown, a bracket mechanism 4 is installed on the battery cell support mechanism 1. The bracket mechanism 4 includes a pair of support parts 41, which are arranged parallel to each other along the conveying direction of the battery cell 3. In some other embodiments of this application, battery cell conveying mechanisms are also provided on both sides of the battery cell support mechanism 1 for conveying the battery cell along the first direction. A receiving part 42 for accommodating the reverse bending of the battery cell 3 is provided between the pair of support parts 41. The upper surface of the support part 41 is flush with the conveying surface of the battery cell support mechanism 1. In this way, the battery cell 3 can be smoothly conveyed from the battery cell support mechanism 1 to the bracket mechanism 4. When the battery cell 3 moves above the receiving part 42, the rolling surface 21 rolls the battery cell 3. At this time, in order to ensure that the battery cell 3 can be successfully corrected, the rolling surface 21 needs to be lowered below the support surface of the battery cell support mechanism 1. The receiving part 42 is a downwardly recessed space. Thus, the rolling surface 21 can be lowered into the receiving part 42 to realize the reverse bending of the battery cell 3.

[0041] In this embodiment, a single-cell correction method is adopted. Compared with the traditional correction method, which corrects the entire string of cells at the same time on the string transfer mechanism, single-cell correction can effectively avoid phenomena such as microcracks and solder strip bending caused by the reduction of the spacing between cells in the string or the stacking of cells due to the change of the horizontal length of the cells during bending and the unchanged relative position of the cell center. Example 2:

[0042] like Figure 4 As shown, in this embodiment, the battery cell 3 is continuously conveyed in a horizontal direction, and the battery cell 3 has a shape that is low at both ends and high in the middle. The battery cell straightening mechanism 2 is disposed above the battery cell 3 and is used to apply rolling force to the battery cell from top to bottom. In some other embodiments of this application, the battery cell 3 can also be conveyed forward in a way that is low in the middle and high at both ends. Based on this conveying shape, the battery cell straightening mechanism 2 can be disposed below the battery cell 3 and apply rolling force to the battery cell 3 from bottom to top. In some other embodiments, the battery cell 3 can also be fed longitudinally, and the battery cell straightening mechanism 2 is disposed on the side of the battery cell 3 and rolls the battery cell in the transverse direction.

[0043] In this embodiment, the process of moving the battery cell to the receiving portion 42 includes: first contacting the first support portion 411 at the front end in the conveying direction, then continuing to convey it forward to contact the second support portion 412; then, the two ends of the width of the battery cell 3 are respectively mounted on the first support portion 411 and the second support portion 412. In this embodiment, both the first support portion 411 and the second support portion 412 are rollers, and the receiving portion 42 is located in the downwardly recessed area between the first support portion 411 and the second support portion 412. When section 412 is reached, the cell straightening mechanism 2 drives the rolling surface 21 to continuously roll along an arc-shaped trajectory on the surface of the cell 3 along the conveying direction of the cell 3. The downward rolling stroke in the area near the first support section 411 and the second support section 412 is less than the rolling stroke in the middle of the cell 3. That is, the movement trajectory of the rolling surface 21 is to first descend along the curve, and then rise along the curve after descending to the lowest point. This ensures that the area near the center of the cell 3 has a reverse bending shape. At this time, the amount of reverse bending compensates for the warpage of the cell after welding, thereby achieving the shaping effect of the cell after welding. In this embodiment, the rolling surface 21 is a mechanism with an arc-shaped rolling surface, such as a pressure roller, a roller, or a pressure block with an arc-shaped end face. Using a rolling pressure roller or roller allows for rolling movement, resulting in a better rolling effect. The lowest point of the rolling surface 21 is located on the central axis in the length direction of the receiving section 42, ensuring the accuracy of the straightening and allowing the calculated amount of reverse bending to better compensate for the warpage of the cell after welding. Example 3:

[0044] like Figure 5 As shown, the battery cell 3 is conveyed laterally along the first direction. When the battery cell 3 is conveyed between the first support part 411 and the second support part 412, the battery cell straightening mechanism 2 drives the rolling surface 21 to roll the surface of the battery cell 3 in a direction opposite to the conveying direction of the battery cell 3. That is, the rolling surface 21 first rolls the part near the second support part 412, then rolls to the middle area of ​​the battery cell 3, and finally rolls the battery cell near the first support part 411. When the rolling direction of the rolling surface 21 is opposite to the conveying direction of the battery cell 3, even if the battery cell 3 has a small forward displacement during the transmission process, If the displacement is poor, a slight positional compensation can be applied in the conveying direction by reverse rolling to reduce the displacement deviation to a certain extent. Since the battery cells 3 are transported in whole strings, they can usually be configured in strings of 5-15. Adjacent battery cells 3 are connected by welding strips. Conveyor lines are set on both sides of the battery cell support mechanism 1. The battery strings are transported forward by the conveyor lines. When the first battery cell 3 enters between the first support part 411 and the second support part 412, the rolling surface 21 is driven to roll in the opposite direction to the conveying direction of the battery cell 3, which can better avoid the stacking phenomenon caused by the reduction of the spacing between the battery cells 3.

[0045] like Figure 6 As shown, the bracket mechanism 4 is installed on the inter-string compensation translation module 5. The bracket mechanism 4 is provided with a first support part 411 and a second support part 412. The first support part 411 and the conveying surface at the front end in the conveying direction are configured as a first conveying area. The battery cell 3 moves from the first conveying area to the bracket mechanism 4 and is corrected in the recessed receiving part 42 in the middle of the bracket mechanism 4. The width of the receiving part 42 is smaller than the width of the battery cell 3. A support plate 43 is provided in the receiving part 42. The support plate 43 is driven by a power mechanism and can be lifted and lowered in the second direction to assist in the feeding process of the battery cell 3. The inter-cell compensation translation module 5 comprises a drive mechanism 51, a transmission mechanism 52, and a guide mechanism 53. The transmission mechanism 52 is fixed to the cell support mechanism 1. In this embodiment, the transmission mechanism 52 is a rack and pinion mechanism, with its length direction horizontally aligned along a first direction. In other embodiments, the transmission mechanism can also be a synchronous belt or similar mechanism. The drive mechanism 51 is a motor, with a gear at its output end meshing with the rack. The drive mechanism is fixed to a mounting plate 54, and the guide mechanism 53 is mounted on one side of the mounting plate 54. In this embodiment, the guide mechanism 53 is a combination of a slide rail and a slider. To improve the stability of the guide, a combination of slide rails and sliders is provided on both sides of the cell support mechanism 1. The mounting plate 54 is bolted to the top of the mounting plate 54 via the mounting mechanism 53. The drive mechanism 51 provides power to move the mounting plate along the first direction on the transmission mechanism 52 and the guide mechanism 53, thereby enabling the bracket mechanism 4 to move forward or backward a certain distance in the first direction. In some embodiments, the battery cells 3 are continuously fed in strings. After a period of time, a certain positional deviation will form between the battery cells 3 and the bracket mechanism 4. If the positional deviation is too large, the correction effect of the battery cells 3 will be worse. Therefore, the inter-string compensation translation module 5 provided in this embodiment can drive the bracket mechanism 4 to perform positional compensation in the horizontal direction, thereby ensuring the accuracy of the correction position. At the same time, it can ensure that the battery cell bracket mechanism 4 is directly below the corrected battery cell 3 each time, avoiding situations such as downward displacement.

[0046] like Figure 7As shown, in some other embodiments of this application, the battery cell support mechanism 1 is provided with a conveyor belt 11, which is wound around a conveyor roller 12. A first support portion 411 and a second support portion 412 are provided between a pair of conveyor rollers 12. After the conveyor belt 11 passes over the first support portion 411, it passes downward through the lower surface of the support roller and then winds up. After passing the surface of the second support portion 412, both ends of the conveyor belt are respectively wound around the conveyor rollers 12 located outside the first support portion 411 and the second support portion 412. The conveyor belt between 1 is configured as the first conveying zone, and the conveyor belt between the feeding roller 12 and the second support 412 is configured as the second conveying zone. The battery cell 3 is conveyed along the first direction in the first conveying zone and the second conveying zone. The area recessed downward between the first conveying zone and the second conveying zone is configured as the receiving portion 42. The width of the receiving portion 42 is smaller than the width of the battery cell 3. A support plate 43 is provided in the receiving portion 42. The support plate 43 is driven by a power mechanism and can be lifted and lowered in the second direction to assist in the feeding process of the battery cell 3.

[0047] like Figure 8As shown, the battery cell straightening mechanism 2 includes a transverse movement mechanism 22 and a rolling mechanism 23. The transverse movement mechanism 22 is a combination of a motor, a slide rail, and a slider. The rolling mechanism 23 includes a longitudinal drive mechanism 231 and a pressure roller 232. The longitudinal drive mechanism 231 is fixed to the transverse movement mechanism 22 by a mounting plate and can be driven by the transverse movement mechanism to move along a first direction. In this embodiment, the longitudinal drive mechanism 231 can be a mechanism that provides power, such as a motor or a cylinder. When the battery cell 3 moves along the first direction between the first support portion 411 and the second support portion 412, the transverse movement mechanism 22 drives the pressure roller 232 to move the battery cell 3 closer to the first support portion 411. Above 1, the drive mechanism 231 drives the pressure roller 232 to contact the battery cell 3. Then, the lateral movement mechanism 22 moves towards the second support part 412, while the drive mechanism 231 drives the pressure roller 232 to continue to move downward. When it reaches the lowest point, the originally bent battery cell 3 achieves reverse bending. The highest point of the originally upward curved arc surface is now bent downward as the lowest point of the arc surface. Then, the moving direction and speed of the lateral movement mechanism 22 remain unchanged, and the drive mechanism 231 drives the pressure roller 232 to start moving upward until the pressure roller 232 is moved to the vicinity of the second support part 412 and detaches from the battery cell 3, thus completing the correction of the battery cell 3. The lateral movement mechanism 22 and the rolling mechanism 23 achieve arc compensation, making the correction trajectory of the pressure rollers arc-shaped. After the correction of a single battery cell 3 is completed, the rolling mechanism 23 is lifted, the pressure roller 232 disengages from the battery cell, and the battery string moves forward one cell position. Compared with the traditional method of using cylinders or springs to statically correct the middle or sides of the long side of the battery cell, the solution provided in this embodiment can dynamically and flexibly correct different positions of the battery cell. The degree of arcing can be controlled by adjusting the lifting stroke of the rolling mechanism 23, which can avoid the phenomenon of the battery cell being wavy after correction by the traditional static correction mechanism.

[0048] The above embodiments are merely illustrative of the technical concept and features of this application, intended to enable those skilled in the art to understand the content of this application and implement it accordingly, and should not be construed as limiting the scope of protection of this application. It is obvious to those skilled in the art that this application is not limited to the details of the above exemplary embodiments, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this application is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this application.

Claims

1. A correction device for photovoltaic cells, characterized in that, include: A battery cell support mechanism (1) is provided, wherein the battery cell (3) has an arc-shaped curved shape on the battery cell support mechanism (1); The battery cell straightening mechanism (2) is located on the side of the arc-shaped bend protrusion near the battery cell (3), and includes an arc-shaped rolling surface (21). The arc-shaped rolling surface (21) can move on the surface of the battery cell (3) in an arc-shaped trajectory opposite to the arc-shaped bend of the battery cell (3), bending the battery cell (3) in the opposite direction of stress bending.

2. The photovoltaic cell correction device according to claim 1, characterized in that, The battery cell correction mechanism (2) includes a lateral movement mechanism (22) and a rolling mechanism (23). The lateral movement mechanism (22) can move along a first direction, and the rolling mechanism (23) can move along a second direction that is close to or away from the battery cell (3). The lateral movement mechanism (22) and the rolling mechanism (23) drive the rolling surface (21) to roll on the battery cell (3) along the first direction and the second direction in an arc-shaped path.

3. The photovoltaic cell correction device according to claim 2, characterized in that, The battery cell support mechanism (1) is provided with a bracket mechanism (4), the bracket mechanism (4) includes a pair of support portions (41) spaced apart along the conveying direction of the battery cell (3), and a receiving portion (42) is configured between the pair of support portions (41) to be bent in the opposite direction of the battery cell (3).

4. The photovoltaic cell correction device according to claim 3, characterized in that, The rolling stroke of the rolling surface (21) on the battery cell (3) includes at least one rolling downward stroke with a gradually decreasing trend and one rolling downward stroke with a gradually increasing trend.

5. The photovoltaic cell correction device according to claim 4, characterized in that, The lowest point of the rolling surface (21) moving along the second direction is located on the central axis of the accommodating portion (42) in the length direction.

6. The photovoltaic cell correction device according to claim 5, characterized in that, A battery cell conveying mechanism is provided on one side of the battery cell support mechanism (1) for conveying battery cells (3) along a first direction. The rolling direction of the rolling surface (21) is the same as the conveying direction of the battery cell (3), and it descends along a curve to the lowest point from one end of the battery cell (3) and then rises along a curve to the other end of the battery cell (3).

7. The photovoltaic cell correction device according to claim 6, characterized in that, The supporting surface of the battery cell support mechanism (1) is provided with at least one material storage area on both sides of the bracket mechanism (4), wherein at least one of the material storage areas is used to mount the end face of the battery cell (3) as the support part (41), and the battery cell (3) moves from the area to a pair of the support parts (41).

8. The photovoltaic cell correction device according to claim 7, characterized in that, The support portion (41) includes a first support portion (411) and a second support portion (412), and the width of the receiving portion (42) formed between the first support portion (411) and the second support portion (412) is smaller than the width of the battery cell (3).

9. A photovoltaic cell correction device according to any one of claims 3-8, characterized in that, The bracket mechanism (4) is mounted on the battery cell support mechanism (1) and can be driven by the drive mechanism to reciprocate along the first direction.

10. A photovoltaic cell correction device according to claim 5, characterized in that, The rolling direction of the rolling surface (21) is opposite to the conveying direction of the battery cell (3), and it descends along the curve from one end of the battery cell (3) to the lowest point and then rises along the curve to the other end of the battery cell (3).

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