A solder strip folding device

Abstract

The utility model discloses a kind of welding strip folding devices, it is related to photovoltaic module manufacturing technical field, for the free section welding strip of cell string end portion extension is folded, at least one end portion of cell string has the free section welding strip of extension, this welding strip folding device includes: placement platform, for placing cell string;Preheating component, for at least partially bonding with the main surface of cell string of adhesive strip placed in the main surface end portion area of cell string;Folding heating component, folding heating component is set to at least one side of the length direction of placement platform, for placing the free section welding strip of cell string end portion extension, and free section welding strip is folded, and make the free section welding strip after folding and the adhesive strip on the main surface of cell string bonding.The welding strip folding device realizes the folding and fixing of free section welding strip in single string cell string, without synchronously welding strip folding to multiple cell strings in laminating process, greatly simplify preparation process.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module manufacturing technology, and in particular to a welding strip folding device. Background Technology

[0002] As the performance of solar cells continues to improve, the placement of the busbars has also been continuously adjusted. In order to minimize the shading of sunlight by the busbars, existing technologies have folded the free ends of the middle section of the cell string (free section of the welding strip) to achieve a technical solution of welding the busbars on the back of the cell.

[0003] However, the existing ribbon folding process involves folding the ribbons of multiple battery strings simultaneously during lamination. This is limited by positioning deviations in the arrangement of the multiple battery strings and dimensional tolerances, making the ribbons prone to breakage during folding. Furthermore, the existing ribbon folding process requires separately purchased specialized ribbon folding and welding equipment, which is expensive. Utility Model Content

[0004] In view of this, this utility model provides a ribbon folding device. A preheating component first adheres adhesive strips to the end areas of the main surface of the battery string. Then, a folding heating component folds and heats the free section of the ribbon in the battery string placed on the placement platform. This allows the folded free section of the ribbon to bond to the adhesive strips on the main surface of the battery string, thus achieving the folding and fixing of the free section of the ribbon in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed ribbons can be directly arranged and connected, eliminating the need to simultaneously fold the ribbons of multiple battery strings during lamination, greatly simplifying the manufacturing process.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] In a first aspect, this utility model provides a welding strip folding device for folding a free section of welding strip extending from the end of a battery string. The battery string is formed by connecting multiple battery cells together with welding strips, and at least one end of the battery string has a free section of welding strip extending out. The welding strip folding device includes: a placement platform for placing the battery string; a preheating component for at least partially bonding an adhesive strip placed in the end region of the main surface of the battery string to the main surface of the battery string; and a folding heating component disposed on at least one side of the placement platform along its length direction for placing the free section of welding strip extending from the end of the battery string, folding the free section of welding strip, and bonding the folded free section of welding strip to the adhesive strip located on the main surface of the battery string.

[0007] The first aspect of the above-mentioned utility model has the following advantages or beneficial effects: First, an adhesive strip is bonded to the end region of the main surface of the battery string using a preheating component. Then, a folding heating component is used to fold and heat the free section of the solder ribbon in the battery string placed on the placement platform. This allows the folded free section of the solder ribbon to bond to the adhesive strip on the main surface of the battery string, thereby achieving the folding and fixing of the free section of the solder ribbon in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed solder ribbons can be directly arranged and connected, eliminating the need to simultaneously fold the solder ribbons of multiple battery strings during lamination, greatly simplifying the manufacturing process. Attached Figure Description

[0008] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:

[0009] Figure 1 This is a schematic diagram of the overall structure of the welding strip folding device according to an embodiment of the present utility model;

[0010] Figure 2 This is a top view of the welding strip folding device according to an embodiment of the present utility model;

[0011] Figure 3 This is a partial schematic diagram of one side of a welding strip folding device according to an embodiment of the present utility model;

[0012] Figure 4 According to the embodiments of this utility model Figure 3 A magnified structural diagram of region A in the middle;

[0013] Figure 5 This is a partial schematic diagram of one side of another welding strip folding device according to an embodiment of the present utility model;

[0014] Figure 6 This is a partial schematic diagram of one side of another welding strip folding device according to an embodiment of the present utility model;

[0015] Figure 7 This is a front view of the welding strip folding device according to an embodiment of the present utility model;

[0016] Figure 8 This is a schematic diagram of the specific structure of the preheating component according to an embodiment of the present utility model;

[0017] Figure 9 This is a schematic diagram of the heating element in the folding heating assembly according to an embodiment of the present utility model;

[0018] Figure 10 This is a schematic diagram of the structure of the folding part, control part and moving part in the folding heating assembly according to an embodiment of the present utility model;

[0019] Figure 11 This is a schematic diagram of the main process of a method for folding welding strips according to an embodiment of the present utility model;

[0020] Figure 12 This is a schematic diagram of the main process of another method for folding welding strips according to an embodiment of the present utility model;

[0021] Figure 13 This is a detailed step diagram of step S1203 according to an embodiment of the present utility model;

[0022] Figure 14 This is a partial structural diagram of the end weld strip of one end of the battery body according to an embodiment of the present invention after the folding heating assembly is folded;

[0023] Figure 15 This is a partial structural diagram of the end weld strip at the other end of the battery body according to an embodiment of the present invention after the folding heating assembly is folded;

[0024] Figure 16 This is a schematic diagram of the battery string structure obtained after step S1303 according to an embodiment of the present invention.

[0025] Figure 17 This is a schematic diagram of the structure of a fixing part according to an embodiment of the present utility model;

[0026] Figure 18 This is a schematic diagram of the main process of a method for preparing a photovoltaic laminate according to an embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 1-Placement platform;

[0029] 2-Preheating component; 21-Heating section; 22-Drive section; 23-Support rod; 24-Adsorption section;

[0030] 3-Folding heating assembly; 31-Folding part; 311-Guide groove; 312-Heating element; 3121-Heating plate body; 3122-Heating wire; 32-Control unit; 33-Moving part; 34-Fixing part; 341-First clamping end; 342-Second clamping end;

[0031] 4- Adhesive strip; 5- Flexible adhesive pad. Detailed Implementation

[0032] To facilitate and clearly describe the welding strip folding device of this utility model, exemplary embodiments of this utility model are described below with reference to the accompanying drawings, including various details of the embodiments of this utility model to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this utility model. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0033] Figure 1 and Figure 2 This invention illustrates the overall structure of a welding strip folding device according to an embodiment of the present invention, wherein... Figure 1 This is a schematic diagram of the overall structure of a welding strip folding device provided in an embodiment of the present invention. Figure 2 This is a top view of a welding strip folding device provided in an embodiment of the present utility model. Figure 1 and Figure 2 As shown, the present invention provides a welding strip folding device for folding the free section welding strip extending from the end of a battery string. The battery string is formed by connecting multiple battery cells together with welding strips, and at least one end of the battery string has an extended free section welding strip. Specifically, the welding strip folding device includes: a placement platform 1 for placing the battery string; a preheating component 2 for at least partially bonding an adhesive strip 4 placed in the end region of the main surface of the battery string to the main surface of the battery string; and a folding heating component 3 disposed on at least one side of the placement platform 1 along its length direction for placing the free section welding strip extending from the end of the battery string, folding the free section welding strip, and bonding the folded free section welding strip to the adhesive strip 4 located on the main surface of the battery string.

[0034] Among them, the free segment solder strip refers to the solder strip on the outermost cell of the battery string, away from its adjacent cell, and is typically used to connect to the busbar located on one side of the battery string. Figure 1 and Figure 2 As can be seen, by placing the free section of the welding strip corresponding to the folding heating component 3, the free end of the free section of the welding strip can be folded using the folding heating component 3, and the heating performance in the folding heating component 3 can be used to bond the free section of the welding strip to the adhesive strip 4 on the main surface of the battery string after folding.

[0035] It is understandable that, for battery strings, there are usually free-segment solder ribbons extending from both ends of the battery string along its length. The difference lies in the polarity of the free-segment solder ribbons extending in different directions and their different positions within the battery string. In one optional embodiment, there are free-segment solder ribbons extending from both ends of the battery string. One end, A, extends from the front main surface of the battery string, and the other end, B, extends from the back main surface of the battery string. The front and back main surfaces are two surfaces facing each other in the thickness direction of the battery string. The free-segment solder ribbons extending from the front main surface are folded over from end A to the back main surface, and the folded free-segment solder ribbons are bonded to the insulating adhesive strip pre-bonded to the area of ​​end A on the back main surface. The free-segment solder ribbons extending from the back main surface are folded over from end B to the back main surface, and the folded free-segment solder ribbons are bonded to the buffer adhesive strip pre-bonded to the area of ​​end B on the back main surface. In other words, the free-segment weld strips extending from different directions of the battery string are located on the front and back main surfaces of the battery string, respectively, and their polarities are different. Therefore, after folding, for weld strips of the same polarity, only a buffer adhesive strip is needed for bonding. However, for weld strips of different polarities, an insulating adhesive strip must be used for bonding to ensure the overall photoelectric conversion performance of the photovoltaic module subsequently manufactured. That is to say, in this embodiment of the invention, adhesive strips 4 are provided at both ends of the length direction of the main surface of the battery string. However, based on the different polarities of the corresponding free-segment weld strips, the types and functions of the adhesive strips 4 at both ends are also different. One is an insulating adhesive strip, while the other is a buffer adhesive strip.

[0036] Specifically, in this embodiment of the invention, the adhesive strip 4 is first placed on the end region of the main surface of the battery string using the preheating component 2, and then the heating part 21 in the preheating component 2 is used to achieve heat bonding. Figure 1 , Figure 7 and Figure 8 As shown, in an optional embodiment, the preheating assembly 2 includes, in addition to the heating part 21, a driving part 22, a support rod 23, and an adsorption part 24; wherein, the driving part 22 is used to drive the support rod 23 to move; the adsorption part 24 and the heating part 21 are both fixedly connected to the support rod 23, and the adsorption end of the adsorption part 24 and the heating end of the heating part 21 are both arranged facing the placement platform 1; the adsorption part 24 is used to adsorb the adhesive strip 4, and moves the adhesive strip 4 to a designated position under the drive of the driving part 22; the heating part 21 is used to heat the adhesive strip 4, so that the adhesive strip 4 adheres to the main surface of the battery string. Specifically, Figure 7 A front view of the welding strip folding device in an embodiment of the present invention is shown to illustrate the positional relationship between the preheating component 2 and the placement platform 1; Figure 8A schematic diagram of the preheating assembly 2 is shown. Additionally, the width of the adhesive strip 4 should be greater than the length of the folded portion of the free section of the solder strip to completely prevent electrical connection between the folded free section of the solder strip and the opposite polarity grids in the battery string.

[0037] Specifically, the drive unit 22 can be a robotic arm, which, controlled manually or by machine, can drive the support rod 23 to move horizontally and vertically according to a predetermined movement path. The support rod 23 can be a long, rod-shaped or columnar structure, and multiple adsorption parts 24 are spaced apart on the support rod 23 to adsorb adhesive strips 4 of different sizes. The specific structure of the adsorption part 24 can be an adsorption through hole, and the adsorption of the adhesive strip 4 can be achieved by vacuuming at the adsorption through hole.

[0038] In an alternative embodiment, with Figure 8 For example, the heating part 21 and the adsorption part 24 are set separately, and there is no mutual interference between them. The adhesive strip 4 can be released by the adsorption part 24 and then heated by the heating part 21, or the adhesive strip 4 can be heated by the heating part 21 while the adsorption part 24 is adsorbing the adhesive strip 4. It can be understood that after the preheating component 2 has completed the placement of the adhesive strip 4 and the heating and fixing of the adhesive strip 4, it will be moved away from above the adhesive strip 4 to avoid interfering with the subsequent folding process of the free section welding strip.

[0039] In a further optional embodiment, the end of the heating part 21 has a semi-circular structure, and the heating parts 21 are spaced apart along the length of the support rod 23. The advantage of this arrangement is that it can provide a small heating area for the adhesive strip 4, avoiding overheating, while ensuring flexible contact with the battery string and avoiding damage to the battery string.

[0040] As can be seen, by setting the preheating component 2, the adhesive strip 4 can be pre-fixed in the end area of ​​the battery string before the free section welding strip is folded. Thus, after the free section welding strip is folded, the adhesive strip 4 can be used to bond the free section welding strip, while avoiding the problem of short circuit in the battery string.

[0041] Below, with Figure 2 , Figure 3 , Figure 5 as well as Figure 10 Taking an example, the specific structure of the folding heating assembly 3 provided in this embodiment of the present invention will be described. Figure 2 , Figure 3 , Figure 5 as well as Figure 10As shown, the folding heating assembly 3 provided by this utility model includes: a folding part 31 and a control part 32; wherein, the folding part 31 is a plate-shaped structure, and a heating element 312 for heating the free section welding strip is provided on the folding part 31; the first length direction of the plate-shaped structure is consistent with the second width direction of the placement platform 1, and the first width direction of the plate-shaped structure is consistent with the second length direction of the placement platform 1; the length of the folding part 31 along the first length direction is not less than the width of the battery body 11 along the second width direction; the control part 32 is fixedly connected to the folding part 31 and is used to drive the folding part 31 to fold around one side edge of the battery string length direction as an axis.

[0042] The heating element 312 functions to weld and fix the folded portion of the free section of the welding strip after it has been folded, so that the free section of the welding strip can fuse with the adhesive strip 4 after heating, thereby achieving the purpose of fixing the folded free end of the welding strip. For example, as... Figure 9 As shown, where, Figure 9 (a) in the figure represents the structure of the first main surface of the folded part 31. Figure 9 In the diagram, (b) represents the structure of the second main surface of the folded portion 31. The second main surface is opposite to the first main surface and constitutes the two main surfaces of the folded portion 31. Figure 9 It can be seen that the heating element 312 is preferably disposed on the second main surface of the folding portion 31 opposite to the folding direction.

[0043] In further optional embodiments, it remains as follows Figure 9 As shown in (b), the heating element 312 includes a heating plate body 3121 and a heating wire 3122 corresponding to the guide groove 311. By separately setting the heating plate body 3121 and the heating wire 3122, the free section of the welding strip located in the guide groove 311 and other areas outside the guide groove 311 can be heated at different temperatures. That is, the heating plate body 3121 and the heating wire 3122 can be set to different temperatures to achieve precise heating only for the free section of the welding strip in the guide groove 311. Therefore, in a further optional embodiment, there are multiple guide grooves 311 and heating wires 3122; and each heating wire 3122 corresponds to a guide groove 311.

[0044] The control unit 32 can be a folding motor. When the folding motor is in the starting state, it can drive the folding part 31 to fold at multiple angles around one edge of the battery string along its length. Typically, multiple free-segment solder strips are spaced apart on the battery string to improve current conduction efficiency. In order to fold all the free-segment solder strips at once, this embodiment of the invention sets the length of the folding part 31 along the first length direction to be no less than the width along the second width direction of the battery string. That is, all the spaced free-segment solder strips can be placed on the folding part 31. Thus, during the folding process of the folding part 31, multiple free-segment solder strips on one side of the battery string can be folded synchronously, improving the folding efficiency of the solder strips.

[0045] However, relying solely on the folding portion 31 of the plate structure is insufficient to accurately control the position of the free section of the welding strip after folding. Therefore, in a further optional embodiment of this utility model, such as Figures 3 to 6 As shown, the folded portion 31 is provided with at least one guide groove 311 for placing the free section of the solder strip. Specifically, in order to limit the movement of the free section of the solder strip as much as possible, the width of the guide groove 311 can be greater than the width of the free section of the solder strip, but less than 1.2 times the width of the free section of the solder strip. In an optional embodiment, the cross-sectional shape of the guide groove 311 can be a combination of at least one or more of the following: rectangular, triangular, and circular.

[0046] from Figures 3 to 6 As can be seen, in one optional embodiment, the number of guide grooves 311 should be no less than the number of free-segment weld strips, and each free-segment weld strip is located in one guide groove 311. In a further optional embodiment, for the structure in which guide grooves 311 are provided on the folding portion 31, the number of guide grooves 311 is the same as the number of free-segment weld strips, and the guide grooves 311 correspond one-to-one with the free-segment weld strips. Therefore, by providing guide grooves 311 on the folding portion 31, this embodiment of the present invention can effectively restrict the movement space of the free-segment weld strips, ensuring that the free-segment weld strips do not shift during the folding process.

[0047] In a further optional embodiment, the folding heating assembly 3 also includes a fixing part 34, such as Figure 3 and Figure 4 As shown, the fixing part 34 includes a clamping part disposed on the placement platform 1 for clamping and fixing the portion of the free section of the solder strip near the end of the battery string; or, as Figure 5 As shown, the fixing part 34 includes a pressure assembly located above the placement platform 1. The pressure assembly has a plate-like structure and is used to press the free section of the solder strip near the end of the battery string. Figure 3 This is a partial schematic diagram of one side of the welding strip folding device according to an embodiment of the present invention. Figure 4 This is an embodiment of the present utility model. Figure 3A magnified structural diagram of region A in the middle; Figure 5 This is another partial schematic diagram of one side of the welding strip folding device according to an embodiment of the present invention.

[0048] from Figure 3 and Figure 4 It can be seen that when the fixing part 34 is a clamping part, multiple fixing parts 34 can be provided according to the number of free segment weld strips, so that each fixing part 34 can clamp one free segment weld strip. In a further optional embodiment, such as Figure 4 As shown, the clamping part includes: a first clamping end 41 and a second clamping end 42 disposed opposite to each other; when the free segment of the welding strip is placed between the first clamping end 41 and the second clamping end 42, the first clamping end 41 and the second clamping end 42 are controlled to move closer to each other until the free segment of the welding strip is clamped. For example, a spring can be used for elastic connection between the first clamping end 41 and the second clamping end 42. During use, an external force is applied to stretch the spring between the first clamping end 41 and the second clamping end 42 to provide a certain placement space between them. Then, the free segment of the welding strip is placed between the first clamping end 41 and the second clamping end 42, and the external force is removed after placement, so that the first clamping end 41 and the second clamping end 42 clamp the free segment of the welding strip under the restoring deformation force of the spring.

[0049] To minimize damage to the battery string caused by the pressure component during pressing, in one alternative embodiment, such as Figure 17 As shown, a flexible pad 5 is provided on the side of the pressure assembly facing the battery string, which can provide a certain buffer when the pressure assembly presses the free section welding strip, and avoid hard contact between the pressure assembly and the battery string.

[0050] The requirements for busbar configuration vary depending on the type of battery string. However, to minimize the shading of sunlight on the front side of the battery string by the busbar, in a further optional embodiment, such as... Figure 1 and Figure 2 As shown, the placement platform 1 is placed horizontally; there are two folding heating components 3, respectively located on both sides of the placement platform 1 along its length; there are two fixing parts 34, respectively corresponding to the free segments of the welding strips with different polarities at both ends of the battery string. In other words, the welding strip folding device provided in this embodiment of the invention can simultaneously fold the free segments of the welding strips at both ends of the battery string, greatly improving the folding efficiency compared to folding the free segments of the welding strips on only one side.

[0051] from Figures 3 to 5It can be seen that the two different structures of the fixing part 34 provided in this embodiment of the present invention can both achieve the purpose of fixing the folded part of the free section of the welding strip to the battery string. Therefore, the specific setting method can be set according to actual needs. For example, for the free section welding strips located at both ends of the battery string, the following can be used: Figure 3 and Figure 4 The clamping part shown is used for fixing, and the free sections of the welding strips located at both ends of the battery string are all treated with... Figure 5 The pressure assembly shown is used for fixing, or for welding the free section strip located at one end of the battery string. Figure 3 and Figure 4 The clamping part shown is fixed, and the free section of the welding strip at the other end is used. Figure 5 The present invention does not specifically limit the use of pressure components for fixing, etc.

[0052] In one alternative embodiment, Figure 5 The structure shown is Figure 3 and Figure 4 The structures shown are located at different ends of the battery string. Specifically, the fixing part 34 in the folding heating assembly 3 is a clamping part provided on the placement platform 1, used to fix the free section of the welding strip extending from the front main surface; the fixing part 34 in the folding heating assembly 3 is a pressure assembly located above the placement platform 1, used to fix the free section of the welding strip extending from the back main surface. That is to say, Figure 5 The structure shown is Figure 3 and Figure 4 The structure shown is used to fix different free-segment solder strips on the front and back surfaces of the battery string. This is because the clamping part is directly mounted on the placement platform 1, so the clamping height is usually limited. Furthermore, during the folding process, the battery string is typically placed with the front surface facing the placement platform 1, meaning the free-segment solder strips on the front surface are in direct contact with the placement platform 1. Therefore, the clamping part is more suitable for fixing the free-segment solder strips on the front surface of the battery string. However, the free-segment solder strips on the back surface of the battery string have a certain distance from the placement platform 1 (i.e., the thickness of the battery string itself), making it more suitable to fix them using a pressure assembly.

[0053] Furthermore, even if the free-segment weld strips at different locations are all folded towards the same main surface of the battery string, the specific folding positions may differ. For example, when the battery string is placed on the placement platform 1 with the back main surface facing upwards, the free-segment weld strip located on the front main surface of the battery string needs to be folded from the front main surface to the back main surface. This means the thickness of the battery string itself needs to be considered during folding, and therefore, a certain length is usually reserved for the battery string's thickness during the folding process. However, for the free-segment weld strip located on the back main surface of the battery string, since it is already located on the back main surface and remains there after folding, the thickness of the battery string itself does not need to be considered during folding; no length reservation is required, and it can be folded directly. Therefore, for the free-segment weld strips located at different ends of the battery string, the specific folding points can be adjusted according to the actual situation. Furthermore, the position of the fixing part 34 can be set according to the folding points to ensure effective fixation of the unfolded portion of the free-segment weld strip.

[0054] This embodiment of the invention also considers the overall thickness of the battery string after the solder strip is folded, i.e., the solder strip overlaps with the solder strip on the other side of the battery string after folding, resulting in a local increase in thickness at the edge of the battery string, which increases the risk of cell cracking during the lamination process. Therefore, in a further optional embodiment, for the structure with guide grooves 311 on the folded part 31, each guide groove 311 corresponds to one free segment solder strip, and each guide groove 311 and its corresponding free segment solder strip are staggered, so that after folding, the free segment solder strips can be staggered and welded to adjacent free segment solder strips. In a further optional embodiment, such as Figure 1 and Figure 2 As shown, the folding heating assembly 3 further includes a moving part 33; the moving part 33 is connected to the control part 32 and is used to drive the folding part 31 and the control part 32 to move horizontally along the second width direction. That is to say, in the process of folding the free segment of the welding strip, the moving part 33 is used simultaneously to realize the staggered welding of the free segment of the welding strip. In an optional embodiment, the moving distance of the moving part 33 is 1 mm to 3 mm, for example, 1 mm, 2 mm, 3 mm, etc. Preferably, after the moving part 33 drives the folding part 31 and the control part 32 to move horizontally along the second width direction, the guide groove 311 is staggered with its corresponding free segment welding strip, so that the free segment welding strip can be staggered and welded between adjacent free segment welding strips.

[0055] In one alternative embodiment, such as Figure 10 As shown, the moving part 33 can be composed of a ball screw slide, that is, through the cooperation between the ball screw and the guide rail, the effect of driving the folding part 31 and the control part 32 to move horizontally along the second width direction can be achieved.

[0056] In summary, the ribbon folding device provided in this embodiment utilizes a preheating component to first adhere adhesive strips to the end areas of the main surface of the battery string. Then, a folding heating component folds and heats the free section of the ribbon in the battery string placed on the placement platform. This allows the folded free section of the ribbon to bond to the adhesive strips on the main surface of the battery string, thus achieving the folding and fixing of the free section of the ribbon in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed ribbons can be directly arranged and connected, eliminating the need to simultaneously fold the ribbons of multiple battery strings during lamination, greatly simplifying the manufacturing process.

[0057] The following is based on Figure 11 The process of folding using the above-mentioned welding strip folding device will be explained in detail, for example. Figure 11 As shown, the method for folding welding strips provided by the above-mentioned welding strip folding device includes the following steps:

[0058] Step S1101: Place the battery string on the placement platform 1 and use the preheating component 2 to attach adhesive strips 4 to the end areas of the main surface of the battery string.

[0059] In step S1102, the folding heating component 3 is used to fold and heat a portion of the free section of the welding strip, so that the folded free section of the welding strip is bonded to the adhesive strip 4 located on the main surface of the battery string.

[0060] To ensure that the free section of the solder strip does not shift during the folding process, in one optional embodiment, the present invention provides another method for folding the solder strip as follows: Figure 12 As shown, it includes:

[0061] Step S1201: Place the battery string on the placement platform 1 and use the preheating component 2 to attach adhesive strips 4 to the end areas of the main surface of the battery string.

[0062] Step S1202: The bending point of the free section of the weld strip is fixed by the fixing part 34;

[0063] In step S1203, the folding heating component 3 is used to fold and heat a portion of the free section of the welding strip, so that the folded free section of the welding strip is bonded to the adhesive strip 4 located on the main surface of the battery string.

[0064] As mentioned above, the fixing part 34 provided in this embodiment of the present invention can be configured in two different ways. Therefore, in a further optional embodiment, the fixing part 34 in the folding heating assembly 3 is a clamping part disposed on the placement platform 1, used to fix the free section of the welding strip extending from the front main surface; the fixing part 34 in the folding heating assembly 3 is a pressure assembly located above the placement platform 1, used to fix the free section of the welding strip extending from the back main surface.

[0065] It should be noted here that, for the case where the fixing part 34 is a pressure assembly located above the placement platform 1, step S1203 can be as follows: Figure 13 As shown, it specifically includes:

[0066] Step S1301: Using the folding heating assembly 3, the free section of the free section of the solder strip is folded 90° toward the main surface direction on one side of the battery string thickness direction;

[0067] Step S1302: Remove the pressure assembly from the free section of the weld strip;

[0068] In step S1303, the free section of the welding strip is folded using the folding heating assembly 3 until it is folded 180°.

[0069] Furthermore, in step S1102 of this embodiment of the present invention, it may specifically include using the control part 32 and the moving part 33 in the folding heating assembly 3 to fold the free section of the free section of the welding strip to the main surface on one side of the battery string thickness direction by cooperating.

[0070] For example, after the folding heating assembly 3 folds the free segment of the solder strip by 180°, it can be as follows: Figure 14 and Figure 15 As shown. Among them, Figure 14 This is a partial structural diagram of the free section of the solder strip at one end of the battery string after it has been folded by the folding heating assembly 3. Figure 15 This is a partial structural diagram of the free section of the solder strip at the other end of the battery string after it has been folded by the folding heating assembly 3. Among them, Figure 14 and Figure 15 These are all top views before the folded heating component 3 is removed, so the actual structure of the free section of the welding strip cannot be seen intuitively.

[0071] For example, the battery string obtained after step S1303 can be as follows: Figure 16 As shown, where, Figure 16 This is a schematic diagram of the overall structure after the free sections of the solder strips at both ends of the battery string are folded over. From... Figure 16 It can be seen that the free section of the welding strip is welded in a staggered manner after being folded, that is, the extension direction of the free section of the welding strip after being folded is different from the extension direction of other welding strips on the battery string (i.e., the welding strips between adjacent battery cells).

[0072] The following is based on Figure 18 The method for preparing the photovoltaic laminate provided in this embodiment of the present invention will be specifically described using an example, such as... Figure 18 As shown, the method for preparing the photovoltaic laminate provided in this embodiment of the present invention includes the following steps:

[0073] Step S1801: Multiple battery cells are connected in series to form a battery string using solder ribbon, and at least one end of the battery string has solder ribbon extending out of its end to form a free section solder ribbon.

[0074] Step S1802: Apply adhesive strip 4 to the end area of ​​the main surface of the battery string;

[0075] Step S1803: The free section of the solder strip extending from the end of the battery string is folded using the solder strip folding device of any of the aforementioned embodiments, and the folded free section of the solder strip is bonded to the adhesive strip 4 located on the main surface of the battery string.

[0076] Step S1804: Arrange multiple battery strings after folding the solder strips, and connect them in series and / or in parallel using busbars to form a battery array;

[0077] Step S1805: The stacked backsheet, back sealing film, cell array, front sealing film and panel are laminated to obtain a photovoltaic laminate.

[0078] In a further optional embodiment, when a free section extends from the end of the front main surface of the battery string, a first transparent pad is also bonded to the end region of the front main surface; when a free section extends from the end of the back main surface of the battery string, a second transparent pad is also bonded to the end region of the front main surface opposite to the back main surface; wherein the front main surface and the back main surface are two surfaces arranged opposite each other in the thickness direction of the battery string. By providing additional first and second transparent pads, the distance between the front main surface and the laminated panel can be increased, ensuring that sufficient adhesive film can be filled between the front main surface and the laminated panel to reduce edge pressure during lamination.

[0079] In summary, the photovoltaic laminate manufacturing method provided by this utility model involves first bonding adhesive strips to the end areas of the main surface of the battery string during the folding process of the free-segment solder ribbon. Then, a folding heating component is used to fold and heat the free-segment solder ribbon in the battery string placed on the placement platform. This allows the folded free-segment solder ribbon to bond to the adhesive strip on the main surface of the battery string, thereby achieving the folding and fixing of the free-segment solder ribbon in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed solder ribbons can be directly arranged and connected, eliminating the need to simultaneously fold the solder ribbons of multiple battery strings during lamination, greatly simplifying the manufacturing process.

[0080] The above steps are provided only to help understand the structure, method, and core idea of ​​this utility model. For those skilled in the art, various improvements and modifications can be made to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A welding strip folding device, characterized in that, The device is used to fold the free section of the solder strip extending from the end of a battery string, wherein the battery string is formed by connecting multiple battery cells together with solder strips, and at least one end of the battery string has an extended free section of solder strip. The solder strip folding device includes: Placement platform (1), the placement platform (1) is used to place the battery string; A preheating assembly (2) is used to at least partially bond an adhesive strip (4) placed at the end region of the main surface of the battery string to the main surface of the battery string. Folding heating assembly (3) is disposed on at least one side of the placement platform (1) along its length direction. It is used to place the free section welding strip extending from the end of the battery string, fold the free section welding strip, and bond the folded free section welding strip to the adhesive strip (4) located on the main surface of the battery string.

2. The welding strip folding device according to claim 1, characterized in that, The folding heating assembly (3) includes: a folding part (31) and a control part (32); The folded part (31) is a plate-shaped structure, and a heating element (312) for heating the free section welding strip is provided on the folded part (31). The first length direction of the plate-like structure is consistent with the second width direction of the placement platform (1), and the first width direction of the plate-like structure is consistent with the second length direction of the placement platform (1); the length of the folding part (31) along the first length direction is not less than the width of the battery string along the second width direction; The control unit (32) is fixedly connected to the folding part (31) and is used to drive the folding part (31) to fold around one side edge of the battery string along its length.

3. The welding strip folding device according to claim 2, characterized in that, The folding heating assembly (3) further includes a fixing part (34), which includes a clamping part disposed on the placement platform (1) for clamping and fixing the portion of the free section welding strip near the end of the battery string; or, the fixing part (34) includes a pressure assembly located above the placement platform (1), which is a plate-shaped structure for pressing the portion of the free section welding strip near the end of the battery string.

4. The welding strip folding device according to claim 2, characterized in that, The folding heating assembly (3) further includes a moving part (33), which is connected to the control part (32) and is used to drive the folding part (31) and the control part (32) to move horizontally along the second width direction.

5. The welding strip folding device according to claim 2, characterized in that, The folded portion (31) is provided with at least one guide groove (311) for placing the free section welding strip.

6. The welding strip folding device according to claim 5, characterized in that, The number of guide grooves (311) is the same as the number of free section weld strips. Each guide groove (311) corresponds to one free section weld strip, and each guide groove (311) is staggered with its corresponding free section weld strip.

7. The welding strip folding device according to claim 1, characterized in that, The preheating assembly (2) includes, in addition to the heating part (21), a driving part (22), a support rod (23), and an adsorption part (24); wherein, The drive unit (22) is used to drive the support rod (23) to move; The adsorption part (24) and the heating part (21) are both fixedly connected to the support rod (23), and the adsorption end of the adsorption part (24) and the heating end of the heating part (21) are both set towards the placement platform (1); the adsorption part (24) is used to adsorb the adhesive strip (4) and move the adhesive strip (4) to the designated position under the drive of the driving part (22); the heating part (21) is used to heat the adhesive strip (4) so ​​that the adhesive strip (4) is bonded to the main surface of the battery string.

8. The welding strip folding device according to claim 7, characterized in that, The end of the heating part (21) is a semi-circular structure, and the heating part (21) is spaced apart along the length direction of the support rod (23).

9. The welding strip folding device according to any one of claims 1-8, characterized in that, Both ends of the battery string have extended free section solder strips. One end A extends from the front main surface of the battery string, and the other end B extends from the back main surface of the battery string. The front main surface and the back main surface are two surfaces that are arranged opposite to each other in the thickness direction of the battery string. The free section of the weld strip extending from the front main surface is folded over from end A to the back main surface, and the folded free section of the weld strip is bonded to the insulating strip pre-bonded in the area of ​​end A on the back main surface; The free section of the weld strip extending from the back main surface is folded over from end B to the back main surface, and the folded free section of the weld strip is bonded to the buffer strip pre-bonded in the area of ​​end B of the back main surface.

10. The welding strip folding device according to claim 9, characterized in that, Regarding the structure of the folding heating assembly (3), including the fixing part (34), The fixing part (34) in the folding heating assembly (3) is a clamping part provided on the placement platform (1) for fixing the free section of welding strip extending from the main surface; The fixing part (34) in the folding heating assembly (3) is a pressure assembly located above the placement platform (1) for fixing the free section of the welding strip extending from the back main surface.

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