Flattening device and photovoltaic module production system

Abstract

The utility model provides a kind of flattening device and photovoltaic module production system.Flattening device includes first flattening mechanism and second flattening mechanism.First flattening mechanism can be flattened to inter-tab solder strip, second flattening mechanism can be flattened to inter-string solder strip, satisfy the requirement of accurate flattening to the middle position of two kinds of solder strip, and the inter-string solder strip of middle position flattening is used in conjunction with busbar folding process, so that when busbar is folded to the back side of battery string, the middle position of inter-string solder strip is flattened and battery sheet is contacted, the contact area between inter-string solder strip and battery sheet is increased, thereby reduce the risk of battery sheet hidden crack caused by busbar folding process, improve the yield of photovoltaic module.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module production equipment, and in particular to a flattening device and a photovoltaic module production system. Background Technology

[0002] Existing photovoltaic modules use a busbar folding process to increase the screen-to-body ratio of the cells, thereby increasing the cell area and the power output of the photovoltaic module. However, after the busbar is folded, the inter-string solder ribbons come into direct contact with the cells. The small contact area and high pressure can easily lead to microcracks in the cells. Utility Model Content

[0003] Therefore, it is necessary to provide a flattening device and a photovoltaic module production system to address the problem that in existing photovoltaic modules, after the busbars are folded, the inter-string welding strips directly contact the cells, resulting in a small contact area and high pressure, which can easily lead to microcracks in the cells.

[0004] The technical solution is as follows:

[0005] On one hand, a flattening device is provided for use in a photovoltaic module production system, the photovoltaic module production system including a pulling device for pulling inter-cell solder strips and inter-string solder strips, the flattening device comprising:

[0006] The first flattening mechanism is configured to flatten the middle portion of the inter-piece solder strip when the traction device pulls the inter-piece solder strip and moves it to the first flattening position;

[0007] The second flattening mechanism is located on one side of the first flattening mechanism along the traction direction of the traction device, and is configured to flatten the middle part of the inter-series welding strip when the traction device pulls the inter-series welding strip and moves it to the second flattening position.

[0008] In the flattening device described in the above embodiments, the first flattening mechanism can flatten the inter-cell solder strips, and the second flattening mechanism can flatten the inter-string solder strips, satisfying the requirement of accurately flattening the middle position of both types of solder strips. Furthermore, the inter-string solder strips flattened at the middle position are used in conjunction with the busbar folding process, so that when the busbar is folded to the back side of the battery string, the flattened middle position of the inter-string solder strips contacts the battery cells, increasing the contact area between the inter-string solder strips and the battery cells. This reduces the risk of microcracks in the battery cells caused by the busbar folding process and improves the yield of photovoltaic modules.

[0009] The technical solution will be further explained below:

[0010] In one embodiment, the first flattening mechanism includes a first upper pressure head, a first lower pressure head, and a first driving assembly. The number of the first upper pressure head and the number of the first lower pressure head are both at least one. Each of the first upper pressure heads is arranged in a direction perpendicular to the traction direction, and each of the first lower pressure heads is correspondingly spaced below each of the first upper pressure heads. The first driving assembly is drively connected to each of the first upper pressure heads and / or each of the first lower pressure heads, so that each of the first upper pressure heads cooperates with the corresponding first lower pressure heads to flatten the inter-piece solder strip.

[0011] In one embodiment, the first upper pressure head cooperates with the corresponding first lower pressure head to simultaneously flatten at least one of the inter-piece solder strips.

[0012] In one embodiment, the second flattening mechanism includes a second upper pressure head, a second lower pressure head, and a second driving assembly. The number of the second upper pressure head and the number of the second lower pressure head are both at least one. Each of the second upper pressure heads is arranged in a direction perpendicular to the traction direction, and each of the second lower pressure heads is correspondingly spaced below each of the second upper pressure heads. The second driving assembly is drively connected to each of the second upper pressure heads and / or each of the second lower pressure heads, so that each of the second upper pressure heads cooperates with the corresponding second lower pressure heads to flatten the inter-strand welding strip.

[0013] In one embodiment, the second upper pressure head cooperates with the corresponding second lower pressure head to simultaneously flatten at least one of the inter-strand welding strips.

[0014] In one embodiment, the first flattening position and the second flattening position are the same flattening position.

[0015] In one embodiment, along the traction direction, each of the first upper pressure heads and each of the second upper pressure heads are arranged at intervals. The first driving component is driven to each of the first upper pressure heads and is used to drive each of the first upper pressure heads to rise and fall relative to each of the first lower pressure heads. The second driving component is driven to each of the second upper pressure heads and is used to drive each of the second upper pressure heads to rise and fall relative to each of the second lower pressure heads.

[0016] In one embodiment, along the traction direction, each of the first upper pressure heads and each of the second upper pressure heads are connected as a whole, the first driving component is drivenly connected to each of the first lower pressure heads and is used to drive each of the first lower pressure heads to rise and fall relative to each of the first upper pressure heads, and the second driving component is drivenly connected to each of the second lower pressure heads and is used to drive each of the second lower pressure heads to rise and fall relative to each of the second upper pressure heads.

[0017] In one embodiment, the flattening device further includes a third driving component, which is connected to the first upper pressure head and / or the second upper pressure head and is used to drive the first upper pressure head and the second upper pressure head to move up and down synchronously.

[0018] On the other hand, a photovoltaic module production system is provided, including a folding device and the flattening device, wherein the folding device is configured to fold the busbar to the back side of the cell string after the busbar is welded to the middle position of the inter-string solder strip.

[0019] In the photovoltaic module production system described above, the busbar is hidden on the back side of the cell string, which increases the screen-to-body ratio and cell area, thereby improving the power output and appearance quality of the photovoltaic module. Furthermore, after the middle portion of the inter-string solder strip is flattened by a flattening device, both ends of the inter-string solder strip are welded to the corresponding two adjacent cell strings. The middle portion of the busbar is welded to the inter-string solder strip, so that when the folding device folds the busbar to the back side of the cell string, the flattened middle portion of the inter-string solder strip contacts the cell. This increases the contact area between the inter-string solder strip and the cell, thereby reducing the risk of microcracks in the cell caused by the busbar folding process and improving the yield of the photovoltaic module. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a partial structural schematic diagram of a photovoltaic module according to one embodiment.

[0023] Figure 2 for Figure 1 A schematic diagram of the inter-chip solder strips and inter-string solder strips.

[0024] Figure 3 This is a schematic diagram of the flattening device according to one embodiment.

[0025] Explanation of reference numerals in the attached figures:

[0026] 10. Flattening device; 100. First flattening mechanism; 110. First upper pressure head; 120. First lower pressure head; 200. Second flattening mechanism; 210. Second upper pressure head; 220. Second lower pressure head; 20. Inter-cell welding strip; 30. Inter-string welding strip; 40. Battery string; 41. Battery cell. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In one embodiment, a photovoltaic module manufacturing system is provided, including a folding device, a traction mechanism, and a flattening device 10. The flattening device 10 is used to flatten the middle portions of the inter-cell solder strips 20 and the inter-string solder strips 30. The traction device is used to pull the inter-cell solder strips 20 and the inter-string solder strips 30. The folding device is configured to fold the busbars to the back side of the cell string 40 after the busbars are welded to the middle portions of the inter-string solder strips 30. Thus, the busbars are hidden on the back side of the cell string 40, increasing the screen-to-body ratio and area of ​​the cell 41, thereby improving the power output and appearance quality of the photovoltaic module. In addition, after the middle part of the inter-string welding strip 30 is flattened by the flattening device 10, the two ends of the inter-string welding strip 30 are welded to the two adjacent battery strings 40 respectively. The busbar is welded to the middle position of the inter-string welding strip 30, so that when the folding device folds the busbar to the back side of the battery string 40, the flattened middle position of the inter-string welding strip 30 contacts the battery cell 41. The contact area between the inter-string welding strip 30 and the battery cell 41 is increased, thereby reducing the risk of microcracks in the battery cell 41 caused by the busbar folding process and improving the yield of photovoltaic modules.

[0029] The folding device can be any existing device for folding the busbars of a photovoltaic module. The traction device can be any existing device for traction of the welding strip.

[0030] like Figure 1 and Figure 2As shown, specifically in this embodiment, the inter-cell solder ribbon 20 refers to the solder ribbon used to connect two adjacent cell 41s in the same battery string 40. The inter-string solder ribbon 30 refers to the solder ribbon used to connect two adjacent battery strings 40. The length of the inter-cell solder ribbon 20 is less than the length of the inter-string solder ribbon 30. The middle position of the inter-cell solder ribbon 20 refers to the exact center position of the inter-cell solder ribbon 20, that is, when both ends of the inter-cell solder ribbon 20 are connected to two adjacent cell 41s in the same battery string 40, the inter-cell solder ribbon 20 is located at the inter-cell spacing between the two cell 41s. Similarly, the middle position of the inter-string solder ribbon 30 refers to the exact center position of the inter-string solder ribbon 30, that is, when both ends of the inter-string solder ribbon 30 are connected to two adjacent battery strings 40, the inter-string solder ribbon 30 is located at the inter-string spacing between the two battery strings 40.

[0031] It should be noted that the flattening device in the prior art is a single flattening structure, which can only flatten one fixed position of the solder strip, that is, it can only flatten the middle position of the inter-piece solder strip 20. However, the length of the inter-series solder strip 30 is not the same as the length of the inter-piece solder strip 20, which cannot meet the process requirements for flattening the inter-series solder strip 30 (that is, it cannot guarantee that the position of the inter-series solder strip 30 being flattened is the middle position of the inter-series solder strip 30).

[0032] like Figure 2 and Figure 3 As shown, in one embodiment, a flattening device 10 is provided, applied in a photovoltaic module production system. The flattening device 10 includes a first flattening mechanism 100 and a second flattening mechanism 200. The first flattening mechanism 100 is configured to flatten the middle portion of the inter-cell bonding strip 20 when a traction device pulls the inter-cell bonding strip 20 and moves it to a first flattening position. The second flattening mechanism 200 is located along the traction direction of the traction device (e.g., the first flattening mechanism 100 is located at the center of the inter-cell bonding strip 20 when the traction device pulls the inter-cell bonding strip 20 and moves it to a first flattening position.) Figure 3 (As shown in direction A) on one side, and configured to flatten the middle position of the inter-string welding strip 30 when the traction device pulls the inter-string welding strip 30 and moves it to the second flattening position.

[0033] In the flattening device 10 described above, when in use, the first flattening mechanism 100 can flatten the inter-cell solder strip 20, and the second flattening mechanism 200 can flatten the inter-string solder strip 30, satisfying the requirement of accurately flattening the middle position of the two types of solder strips. Furthermore, the inter-string solder strip 30 flattened at the middle position is used in conjunction with the busbar folding process, so that when the busbar is folded to the back side of the battery string 40, the middle position of the flattened inter-string solder strip 30 contacts the battery cell 41, increasing the contact area between the inter-string solder strip 30 and the battery cell 41, thereby reducing the risk of microcracks in the battery cell 41 caused by the busbar folding process and improving the yield of photovoltaic modules.

[0034] Specifically, in this embodiment, the flattening device 10 in this application is a double flattening structure.

[0035] It should be noted that the installation position of the first flattening mechanism 100 can be calculated and adjusted based on the length of the inter-piece solder strip 20. The installation position of the second flattening mechanism 200 can be calculated and adjusted based on the length of the inter-series solder strip 30.

[0036] It should be noted that the flattening device 10 can pre-flatten the middle positions of the inter-piece solder strip 20 and the inter-series solder strip 30, and then transport the flattened inter-piece solder strip 20 and the flattened inter-series solder strip 30 to the production line for welding, i.e., flattening before welding. The flattening device 10 can also be directly installed on the production line to achieve simultaneous flattening and welding.

[0037] The first flattening mechanism 100 and the second flattening mechanism 200 can be independently installed at two different workstations to flatten the middle position of the inter-piece solder strip 20 and the middle position of the inter-string solder strip 30 at different workstations respectively; the first flattening mechanism 100 and the second flattening mechanism 200 can also be integrated and installed at the same workstation, and can selectively flatten the middle position of the inter-piece solder strip 20 or the middle position of the inter-string solder strip 30.

[0038] like Figure 3 As shown, the first flattening mechanism 100 further includes a first upper pressure head 110, a first lower pressure head 120, and a first drive assembly. The number of first upper pressure heads 110 and the number of first lower pressure heads 120 are both at least one. Each first upper pressure head 110 is arranged in a direction perpendicular to the traction direction. Each first lower pressure head 120 is correspondingly spaced below each first upper pressure head 110. The first drive assembly is drively connected to each first upper pressure head 110 and / or each first lower pressure head 120, so that each first upper pressure head 110 cooperates with its corresponding first lower pressure head 120 to flatten the inter-sheet solder strip 20. Thus, during feeding, the first upper pressure head 110 and the first lower pressure head 120 move away from each other under the drive of the first driving assembly, so that the inter-piece solder strip 20 can pass through the space between the first upper pressure head 110 and the first lower pressure head 120 under the traction of the traction device. When the traction device moves to the first flattening position, the middle position of the inter-piece solder strip 20 is located between the first upper pressure head 110 and the first lower pressure head 120. During flattening, the first upper pressure head 110 and the first lower pressure head 120 move closer to each other under the drive of the first driving assembly, so that the first upper pressure head 110 and the first lower pressure head 120 cooperate to flatten the middle position of the inter-piece solder strip 20.

[0039] The first drive component can be configured as any structure capable of lifting and lowering in the prior art, such as a lifting cylinder drive structure or a lifting motor drive structure.

[0040] like Figure 3 As shown, optionally, the first upper pressure head 110 cooperates with the corresponding first lower pressure head 120 to simultaneously flatten at least one inter-wafer solder strip 20. In this way, multiple inter-wafer solder strips 20 can share one first upper pressure head 110 and one first lower pressure head 120 for flattening, thereby reducing the manufacturing cost of the flattening device 10.

[0041] Specifically in this embodiment, each first upper pressure head 110 can cooperate with the corresponding first lower pressure head 120 to flatten one or two inter-piece solder strips 20.

[0042] like Figure 3 As shown, in one embodiment, the second flattening mechanism 200 includes a second upper pressing head 210, a second lower pressing head 220, and a second drive assembly. The number of second upper pressing heads 210 and the number of second lower pressing heads 220 are both at least one. Each second upper pressing head 210 is arranged in a direction perpendicular to the traction direction. Each second lower pressing head 220 is correspondingly spaced below each second upper pressing head 210. The second drive assembly is drively connected to each second upper pressing head 210 and / or each second lower pressing head 220, so that each second upper pressing head 210 cooperates with its corresponding second lower pressing head 220 to flatten the inter-strand welding strip 30. Thus, during feeding, the second upper pressure head 210 and the second lower pressure head 220 move away from each other under the drive of the second drive assembly, allowing the inter-strand welding strip 30 to pass through the space between the second upper pressure head 210 and the second lower pressure head 220 under the traction of the traction device. When the traction device moves to the second flattening position, the middle position of the inter-strand welding strip 30 is located between the second upper pressure head 210 and the second lower pressure head 220. During flattening, the second upper pressure head 210 and the second lower pressure head 220 move closer to each other under the drive of the second drive assembly, so that the second upper pressure head 210 and the second lower pressure head 220 cooperate to flatten the middle position of the inter-strand welding strip 30.

[0043] The second drive component can be configured as any structure capable of lifting and lowering in the prior art, such as a lifting cylinder drive structure or a lifting motor drive structure.

[0044] like Figure 3 As shown, optionally, the second upper pressure head 210 cooperates with the corresponding second lower pressure head 220 to simultaneously flatten at least one inter-strand welding strip 30. In this way, multiple inter-strand welding strips 30 can share one second upper pressure head 210 and one second lower pressure head 220 for flattening, thereby reducing the manufacturing cost of the flattening device 10.

[0045] Specifically in this embodiment, each second upper pressure head 210 can cooperate with the corresponding second lower pressure head 220 to flatten one or two inter-serial welding strips 30.

[0046] In one embodiment, the first flattening position and the second flattening position are the same flattening position. Thus, when flattening the inter-cell solder strip 20 and the inter-string solder strip 30, the traction device is located in the same position, facilitating motion control of the traction device and improving the reliability of the photovoltaic module production system. Furthermore, since the difference in length between the inter-cell solder strip 20 and the inter-string solder strip 30 is small, the first flattening mechanism 100 and the second flattening mechanism 200 are integrated into the same workstation, resulting in a smaller space occupied by the flattening device 10 and improving the practicality of the photovoltaic module production system.

[0047] like Figure 3 As shown, optionally, along the traction direction, each first upper pressure head 110 and each second upper pressure head 210 are arranged at corresponding intervals. A first drive assembly is driven to each first upper pressure head 110 and is used to drive each first upper pressure head 110 to rise and fall relative to each first lower pressure head 120. A second drive assembly is driven to each second upper pressure head 210 and is used to drive each second upper pressure head 210 to rise and fall relative to each second lower pressure head 220. In this way, the first upper pressure head 110 and the second upper pressure head 210 are controlled independently, improving the flattening accuracy of the inter-cell solder strip 20 and the inter-string solder strip 30, thereby enhancing the stability and reliability of the photovoltaic module production system.

[0048] Specifically, in this embodiment, each first lower pressure head 120 and each second lower pressure head 220 are arranged at intervals along the traction direction. Each first upper pressure head 110, each first lower pressure head 120, each second upper pressure head 210, and each second lower pressure head 220 are all arranged at intervals along a direction perpendicular to the traction direction.

[0049] Optionally, along the traction direction, each first upper pressure head 110 and each second upper pressure head 210 are connected as a single unit. A first drive assembly is driven by each first lower pressure head 120 and is used to drive each first lower pressure head 120 to rise and fall relative to each first upper pressure head 110. A second drive assembly is driven by each second lower pressure head 220 and is used to drive each second lower pressure head 220 to rise and fall relative to each second upper pressure head 210. Thus, when the first upper pressure head 110 and the second upper pressure head 210 are integrated, each first lower pressure head 120 or each second lower pressure head 220 can be selectively controlled to rise individually to flatten the inter-cell solder strip 20 or the inter-string solder strip 30, improving the practicality of the photovoltaic module production system.

[0050] Specifically, in this embodiment, the flattening device 10 further includes a third driving component. The third driving component is drively connected to the first upper pressure head 110 and / or the second upper pressure head 210, and is used to drive the first upper pressure head 110 and the second upper pressure head 210 to rise and fall synchronously. In this way, the first upper pressure head 110 and the first lower pressure head 120 can be raised and lowered independently under the drive of the third driving component and the first driving component, respectively, so as to adjust the height of the inter-cell solder strip 20 during flattening. The second upper pressure head 210 and the second lower pressure head 220 can be raised and lowered independently under the drive of the third driving component and the second driving component, respectively, so as to adjust the height of the inter-string solder strip 30 during flattening, thereby improving the practicality of the photovoltaic module production system.

[0051] The third drive component can be configured as any structure capable of lifting and lowering in the prior art, such as a lifting cylinder drive structure or a lifting motor drive structure.

[0052] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0057] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A flattening device applied in a photovoltaic module production system, the photovoltaic module production system comprising a traction device for pulling inter-cell bonding strips (20) and inter-string bonding strips (30), characterized in that, The flattening device (10) includes: The first flattening mechanism (100) is configured to flatten the middle part of the inter-piece solder strip (20) when the traction device pulls the inter-piece solder strip (20) and moves it to the first flattening position; The second flattening mechanism (200) is located on one side of the first flattening mechanism (100) along the traction direction of the traction device, and is configured to flatten the middle position of the inter-string welding strip (30) when the traction device pulls the inter-string welding strip (30) and moves it to the second flattening position.

2. The flattening device according to claim 1, characterized in that, The first flattening mechanism (100) includes a first upper pressure head (110), a first lower pressure head (120), and a first driving assembly. The number of the first upper pressure head (110) and the number of the first lower pressure head (120) are both at least one. Each of the first upper pressure heads (110) is arranged in a direction perpendicular to the traction direction. Each of the first lower pressure heads (120) is arranged at intervals below each of the first upper pressure heads (110). The first driving assembly is drivenly connected to each of the first upper pressure heads (110) and / or each of the first lower pressure heads (120) so that each of the first upper pressure heads (110) cooperates with the corresponding first lower pressure heads (120) to flatten the inter-piece welding strip (20).

3. The flattening device according to claim 2, characterized in that, The first upper pressure head (110) cooperates with the corresponding first lower pressure head (120) to simultaneously flatten at least one of the inter-piece solder strips (20).

4. The flattening device according to claim 2, characterized in that, The second flattening mechanism (200) includes a second upper pressure head (210), a second lower pressure head (220), and a second drive assembly. The number of the second upper pressure head (210) and the number of the second lower pressure head (220) are both at least one. Each second upper pressure head (210) is arranged in a direction perpendicular to the traction direction. Each second lower pressure head (220) is arranged at intervals below each second upper pressure head (210). The second drive assembly is drivenly connected to each second upper pressure head (210) and / or each second lower pressure head (220) so that each second upper pressure head (210) cooperates with the corresponding second lower pressure head (220) to flatten the inter-strand welding strip (30).

5. The flattening device according to claim 4, characterized in that, The second upper pressure head (210) cooperates with the corresponding second lower pressure head (220) to simultaneously flatten at least one of the inter-strand welding strips (30).

6. The flattening device according to claim 4, characterized in that, The first flattening position and the second flattening position are the same flattening position.

7. The flattening device according to claim 6, characterized in that, Along the traction direction, each of the first upper pressure head (110) and each of the second upper pressure head (210) are arranged at intervals. The first drive assembly is driven to each of the first upper pressure head (110) and is used to drive each of the first upper pressure head (110) to rise and fall relative to each of the first lower pressure head (120). The second drive assembly is driven to each of the second upper pressure head (210) and is used to drive each of the second upper pressure head (210) to rise and fall relative to each of the second lower pressure head (220).

8. The flattening device according to claim 6, characterized in that, Along the traction direction, each of the first upper pressure head (110) and each of the second upper pressure head (210) are connected as a whole. The first drive assembly is driven to each of the first lower pressure head (120) and is used to drive each of the first lower pressure head (120) to rise and fall relative to each of the first upper pressure head (110). The second drive assembly is driven to each of the second lower pressure head (220) and is used to drive each of the second lower pressure head (220) to rise and fall relative to each of the second upper pressure head (210).

9. The flattening device according to claim 8, characterized in that, The flattening device (10) further includes a third driving component, which is connected to the first upper pressure head (110) and / or the second upper pressure head (210) and is used to drive the first upper pressure head (110) and the second upper pressure head (210) to rise and fall synchronously.

10. A photovoltaic module production system, characterized in that, Includes a folding device and a flattening device (10) as described in any one of claims 1 to 9, the folding device being configured to fold the busbar to the back side of the battery string (40) after the busbar is welded to the middle position of the inter-string welding strip (30).

Images