Solder strip folding device and preparation method of photovoltaic laminated part

Abstract

The invention discloses a welding strip folding device and a preparation method of a photovoltaic laminated piece, and relates to the technical field of photovoltaic module manufacturing, the welding strip folding device is used for folding a free section welding strip extending from the end part of a battery string, at least one end part of the battery string is provided with the free section welding strip extending from the end part, and the welding strip folding device comprises a placing platform, a welding strip folding device and a welding strip folding device, a battery string is placed on the base; the preheating assembly is used for at least partially bonding the adhesive tape placed at the end part area of the main surface of the battery string with the main surface of the battery string; and the turnover heating assembly is arranged on at least one side of the placement platform in the length direction, and is used for placing the free-section welding strip extending out of the end part of the battery string, turning over the free-section welding strip and bonding the turned free-section welding strip with an adhesive tape positioned on the main surface of the battery string. According to the welding strip folding device, folding and fixing of the free-section welding strip in a single battery string are achieved, welding strip folding does not need to be conducted on a plurality of battery strings synchronously in the laminating process, and the preparation technology is greatly simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module manufacturing, and in particular to a welding ribbon folding device and a method for preparing a photovoltaic laminate. Background Art

[0002] As the performance of solar cells continues to improve, the location of the busbar has also been continuously adjusted. In order to avoid the busbar from blocking sunlight as much as possible, the existing technology folds the free end of the end welding ribbon (free section welding ribbon) in the battery string to achieve a technical solution of welding the busbar on the back of the battery cell.

[0003] However, the existing ribbon folding process involves folding the ribbons simultaneously for multiple cell strings during the lamination process. This is limited by the positioning deviations of the cell strings and the dimensional tolerances of the cell strings, which can lead to the ribbons being easily broken during the folding process. Furthermore, the existing ribbon folding process requires separately purchased, dedicated ribbon folding and welding equipment, which is expensive. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a ribbon folding device and a method for preparing a photovoltaic laminate. A preheating assembly is used to first adhere adhesive strips to the end regions of the main surface of a cell string. A folding heating assembly is then used to fold and heat the free-segment ribbons in a cell string placed on a placement platform. The folded free-segment ribbons can then be bonded to the adhesive strips on the main surface of the cell string, thereby achieving the folding and fixing of the free-segment ribbons in a single cell string. In the subsequent lamination process, multiple cell strings with folded and fixed ribbons can be directly connected for layout, eliminating the need to simultaneously fold the ribbons of multiple cell strings during the lamination process, greatly simplifying the preparation process.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a solder ribbon folding device for folding a free-segment solder ribbon extending from an end portion of a battery string, wherein the battery string is formed by connecting a plurality of battery cells in series with a solder ribbon, and at least one end portion of the battery string has a free-segment solder ribbon extending therefrom, and the solder ribbon folding device comprises: a placement platform for placing the battery string; a preheating assembly for at least partially bonding a rubber strip placed in an end region of a main surface of the battery string to a main surface of the battery string; and a folding heating assembly, wherein the folding heating assembly is arranged on at least one side in a length direction of the placement platform, for placing a free-segment solder ribbon extending from an end portion of the battery string, folding the free-segment solder ribbon, and bonding the folded free-segment solder ribbon to the rubber strip located on the main surface of the battery string.

[0007] In a second aspect, the present invention provides a method for preparing a photovoltaic laminate, comprising:

[0008] Step 1: Connecting a plurality of battery cells in series into a battery string using a welding ribbon, wherein at least one end of the battery string has a welding ribbon extending out of the end thereof to form a free section welding ribbon;

[0009] Step 2: providing a rubber strip at the end area of ​​the main surface of the battery string;

[0010] Step 3: using the solder ribbon folding device provided by the first aspect of the present invention to fold the free section of the solder ribbon extending from the end of the battery string, and bonding the folded free section of the solder ribbon to the adhesive strip located on the main surface of the battery string;

[0011] Step 4, arranging the battery strings after the multiple welding ribbons are folded, and connecting them in series or / and in parallel using bus bars to form a battery array;

[0012] Step 5: Laminating the stacked back sheet, rear encapsulation film, cell array, front encapsulation film and panel to obtain a photovoltaic laminate.

[0013] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects: a preheating assembly is used to first adhere adhesive strips to the end areas of the main surface of the battery string, and then a folding heating assembly is used to fold and heat the free-segment welding ribbons in the battery string placed on the placement platform. The folded free-segment welding ribbons can be bonded to the adhesive strips on the main surface of the battery string, thereby achieving the folding and fixing of the free-segment welding ribbons in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed welding ribbons can be directly arranged and connected, eliminating the need to simultaneously fold the welding ribbons of multiple battery strings during the lamination process, greatly simplifying the preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are provided for a better understanding of the present invention and are not intended to limit the present invention.

[0015] Figure 1 2 is a schematic diagram of the overall structure of a welding ribbon folding device according to an embodiment of the present invention;

[0016] Figure 2 is a top view of a welding ribbon folding device according to an embodiment of the present invention;

[0017] Figure 3 is a partial schematic diagram of one side of a welding ribbon folding device according to an embodiment of the present invention;

[0018] Figure 4 According to an embodiment of the present invention Figure 3 Schematic diagram of the enlarged structure of area A in the middle;

[0019] Figure 5is a partial schematic diagram of one side of another welding ribbon folding device according to an embodiment of the present invention;

[0020] Figure 6 is a partial schematic diagram of one side of another welding ribbon folding device according to an embodiment of the present invention;

[0021] Figure 7 is a front view of a welding ribbon folding device according to an embodiment of the present invention;

[0022] Figure 8 is a schematic diagram of the specific structure of a preheating assembly according to an embodiment of the present invention;

[0023] Figure 9 is a schematic structural diagram of a heating element in a folding heating assembly according to an embodiment of the present invention;

[0024] Figure 10 is a structural schematic diagram of a folding portion, a control portion, and a moving portion in a folding heating assembly according to an embodiment of the present invention;

[0025] Figure 11 This is a schematic diagram of the main process of a method for folding a welding ribbon according to an embodiment of the present invention;

[0026] Figure 12 This is a schematic diagram of the main process of another method for folding a welding ribbon according to an embodiment of the present invention;

[0027] Figure 13 is a detailed schematic diagram of step S1203 according to an embodiment of the present invention;

[0028] Figure 14 This is a schematic diagram of the partial structure of the end welding strip at one end of the battery body after the folding heating assembly is folded according to an embodiment of the present invention;

[0029] Figure 15 is a schematic diagram of the partial structure of the end welding strip at the other end of the battery body after the folding heating assembly is folded according to an embodiment of the present invention;

[0030] Figure 16 is a schematic structural diagram of a battery string obtained after step S1303 according to an embodiment of the present invention;

[0031] Figure 17 is a structural schematic diagram of a fixing portion according to an embodiment of the present invention;

[0032] Figure 18 It is a schematic diagram of the main process of a method for preparing a photovoltaic laminate according to an embodiment of the present invention.

[0033] The reference numerals are as follows:

[0034] 1- Place the platform;

[0035] 2- preheating assembly; 21- heating unit; 22- driving unit; 23- supporting rod; 24- adsorption unit;

[0036] 3-folding heating assembly; 31-folding portion; 311-guide groove; 312-heating element; 3121-heating plate body; 3122-heating wire; 32-control portion; 33-moving portion; 34-fixing portion; 341-first clamping end; 342-second clamping end;

[0037] 4- Rubber strip; 5- Flexible rubber pad. DETAILED DESCRIPTION

[0038] To facilitate and clearly describe the present invention's ribbon folding device and method for preparing a photovoltaic laminate, exemplary embodiments of the present invention are described below with reference to the accompanying drawings. Various details of the embodiments are included to aid understanding, but these should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted from the following description.

[0039] Figure 1 and Figure 2 The figure shows the overall structure of a welding ribbon folding device provided by an embodiment of the present invention, wherein: Figure 1 This is a schematic diagram of the overall structure of a welding ribbon folding device provided by an embodiment of the present invention. Figure 2 This is a top view of a welding ribbon folding device provided by an embodiment of the present invention. Figure 1 and Figure 2 As shown, the present invention provides a welding ribbon folding device for folding the free section of welding ribbon extending from the end of a battery string. The battery string is formed by connecting multiple battery cells in series with welding ribbons, and at least one end of the battery string has a free section of welding ribbon extending therefrom. Specifically, the welding ribbon folding device includes: a placement platform 1, the placement platform 1 is used to place the battery string; a preheating component 2, the preheating component 2 is used to bond the adhesive strip 4 placed on the end area of ​​the main surface of the battery string to at least partially the main surface of the battery string; and a folding heating component 3, the folding heating component 3 is arranged on at least one side of the placement platform 1 in the longitudinal direction, and is used to place the free section of welding ribbon extending from the end of the battery string, fold the free section of welding ribbon, and bond the folded free section of welding ribbon to the adhesive strip 4 located on the main surface of the battery string.

[0040] The free section welding strip refers to the welding strip on the edge of the battery cell in the battery string, which is away from its adjacent battery cell and is usually used to connect to the busbar on one side of the battery string. Figure 1 and Figure 2It can be seen that the embodiment of the present invention places the free section of the welding ribbon corresponding to the folding heating component 3, and can use the folding heating component 3 to fold the free end of the free section of the welding ribbon, and after folding, use the heating performance of the folding heating component 3 to achieve the bonding of the free section of the welding ribbon and the main surface strip 4 of the battery string.

[0041] It is understandable that, for a battery string, there are usually free-segment welding strips extending from the battery cells at both ends of the battery string in the length direction. The difference lies in the polarity of the free-segment welding strips extending in different directions and the different positions of the free-segment welding strips in the battery string. In an optional embodiment, there are free-segment welding strips extending from both ends of the battery string, one A end extends a free-segment welding strip from the front main surface of the battery string, and one B end extends a free-segment welding strip from the back main surface of the battery string. The front main surface and the back main surface are two surfaces arranged opposite to each other in the thickness direction of the battery string; the free-segment welding strip extending from the front main surface is folded from the A end to the back main surface, and the folded free-segment welding strip is bonded to the insulating tape pre-bonded to the A end area of ​​the back main surface; the free-segment welding strip extending from the back main surface is folded from the B end to the back main surface, and the folded free-segment welding strip is bonded to the buffer tape pre-bonded to the B end area of ​​the back main surface. That is, the free-segment welding ribbons extending from different directions of the cell string are located on the front and back main surfaces of the cell string, respectively, and the polarities of the two surfaces are different. Therefore, after folding, for welding ribbons of the same polarity, only the buffer rubber strip can be used for bonding, while for welding ribbons of different polarities, the insulating rubber strip must be used for bonding to ensure the overall photoelectric conversion performance of the subsequently manufactured photovoltaic module. In other words, in this embodiment of the present invention, rubber strips 4 are provided at both ends of the length direction of the main surface of the cell string. However, due to the different polarities of the corresponding free-segment welding ribbons, the types and functions of the rubber strips 4 at both ends are also different: one is an insulating rubber strip, and the other is a buffer rubber strip.

[0042] Specifically, the embodiment of the present invention uses the preheating component 2 to first place the adhesive strip 4 on the end area of ​​the main surface of the battery string, and then uses the heating part 21 in the preheating component 2 to achieve heating and bonding. Figure 1 、 Figure 7 and Figure 8 As shown, in an optional embodiment, the preheating assembly 2 includes a driving portion 22, a support rod 23, and an adsorption portion 24 in addition to the heating portion 21; wherein the driving portion 22 is used to drive the support rod 23 to move; the adsorption portion 24 and the heating portion 21 are both fixedly connected to the support rod 23, and the adsorption end of the adsorption portion 24 and the heating end of the heating portion 21 are both arranged toward the placement platform 1; the adsorption portion 24 is used to adsorb the adhesive strip 4 and move the adhesive strip 4 to a specified position under the drive of the driving portion 22; the heating portion 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. Specifically, Figure 7A front view of the solder ribbon folding device according to an embodiment of the present invention is shown to illustrate the positional relationship of the preheating assembly 2 relative to the placement platform 1; Figure 8 The schematic diagram of the specific structure of the preheating assembly 2 is shown. In addition, the width of the rubber strip 4 should be greater than the length of the folded portion of the free section of the welding ribbon to completely isolate the folded free section of the welding ribbon from electrical connection with the fine grids of opposite polarity in the battery string.

[0043] Specifically, the drive unit 22 can be a robotic arm, which, through manual or mechanical control, can drive the support rod 23 to move horizontally and vertically along a predetermined movement path. The support rod 23 can be an elongated rod or columnar structure, with multiple suction portions 24 spaced apart on the support rod 23 to absorb rubber strips 4 of different sizes. The suction portions 24 can be specifically structured as suction holes, which are vacuumed to achieve suction of the rubber strips 4.

[0044] In an optional embodiment, Figure 8 For example, the heating portion 21 and the adsorption portion 24 are separately provided, and there is no mutual interference between the two. The adhesive strip 4 can be heated by the heating portion 21 after the adhesive strip 4 is released by the adsorption portion 24, or the adhesive strip 4 can be heated by the heating portion 21 while the adsorption portion 24 adsorbs the adhesive strip 4. It is understood that after the preheating component 2 completes the placement of the adhesive strip 4 and heats and fixes the adhesive strip 4, it will be removed from above the adhesive strip 4 to avoid interfering with the subsequent folding process of the free section of the welding ribbon.

[0045] In a further optional embodiment, the ends of the heating portions 21 are semicircular in shape, and the heating portions 21 are spaced apart along the length of the support rod 23. This arrangement provides a small heating area for the rubber strip 4, preventing overheating, while ensuring flexible contact with the battery string to avoid damage to the battery string.

[0046] It can be seen that the embodiment of the present invention, by providing a preheating component 2, can pre-fix the adhesive strip 4 in the end area of ​​the battery string before the free section of the welding strip is folded, so that after the free section of the welding strip is folded, the adhesive strip 4 can be used to achieve the bonding of the free section of the welding strip, while avoiding the problem of short circuit of the battery string.

[0047] Below, Figure 2 、 Figure 3 、 Figure 5 as well as Figure 10 Taking the example of FIG. 1 as an example, the specific structure of the folding heating component 3 provided in the embodiment of the present invention is described. Figure 2 、 Figure 3 、 Figure 5 as well as Figure 10As shown, the folding heating assembly 3 provided by the present invention includes: a folding portion 31 and a control portion 32; wherein the folding portion 31 is a plate-like structure, and a heating element 312 for heating the free-segment welding strip is provided on the folding portion 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 portion 31 along the first length direction is not less than the width of the battery body 11 along the second width direction; the control portion 32 is fixedly connected to the folding portion 31, and is used to drive the folding portion 31 to fold with one side edge in the length direction of the battery string as the axis.

[0048] The function of the heating element 312 is to weld and fix the folded portion of the free section of the welding strip after the free section of the welding strip is folded, so that the free section of the welding strip can be solidly integrated with the rubber strip 4 after heating, thereby achieving the purpose of fixing the folded free end welding strip. For example, Figure 9 As shown, Figure 9 (a) shows the structure of the first main surface of the folded portion 31. Figure 9 (b) in FIG. 3 shows the structure of the second main surface of the folded portion 31. The second main surface is opposite to the first main surface and is respectively the two main surfaces of the folded portion 31. Figure 9 It can be seen that the heating element 312 can preferably be arranged on the second main surface of the folding portion 31 opposite to the folding direction.

[0049] In a further optional embodiment, Figure 9 As shown in (b) of the figure, the heating element 312 includes a heating plate body 3121 and a heating wire 3122 corresponding to the guide groove 311. By separately providing 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 located outside the guide groove 311 can be heated to different temperatures. That is, the heating plate body 3121 and the heating wire 3122 can be set to different temperatures to achieve precise heating of only the free section of the welding strip located in the guide groove 311. Therefore, in a further optional embodiment, there are multiple guide grooves 311 and multiple heating wires 3122, and the heating wires 3122 correspond one-to-one with the guide grooves 311.

[0050] The control unit 32 can be a folding motor. When the folding motor is in the activated state, it can drive the folding unit 31 to achieve multi-angle folding with the edge of one side in the length direction of the battery string as the axis. Typically, multiple free-segment welding strips are spaced apart on the battery string to improve the current extraction efficiency. In order to be able to fold all the free-segment welding strips at once, the embodiment of the present invention sets the length of the folding unit 31 along the first length direction to be no less than the width of the battery string in the second width direction. That is, all free-segment welding strips that meet the interval setting can be placed on the folding unit 31. In this way, during the folding process of the folding unit 31, multiple free-segment welding strips on one side of the battery string can be driven to fold synchronously, thereby improving the folding efficiency of the welding strips.

[0051] However, the position of the free section welding strip after folding cannot be accurately controlled by only using the folding portion 31 of the plate-like structure. Therefore, in a further optional embodiment of the present invention, as Figures 3 to 6 As shown, the folded portion 31 is provided with at least one guide groove 311 for accommodating the free-segment welding ribbon. Specifically, to minimize the movement of the free-segment welding ribbon, the width of the guide groove 311 can be greater than the width of the free-segment welding ribbon, but less than 1.2 times the width of the free-segment welding ribbon. In an optional embodiment, the cross-sectional shape of the guide groove 311 can be a combination of at least one or more of a rectangle, a triangle, and a circle.

[0052] from Figures 3 to 6 It can be seen that in an optional embodiment, the number of guide grooves 311 should be no less than the number of free-segment welding strips, and each free-segment welding strip is located in a guide groove 311. In a further optional embodiment, for a 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 welding strips, and each guide groove 311 corresponds to a free-segment welding strip. It can be seen that by providing the guide grooves 311 on the folding portion 31, the embodiment of the present invention can effectively limit the movement space of the free-segment welding strip, ensuring that the free-segment welding strip will not be displaced during the folding process.

[0053] In a further optional embodiment, the folding heating assembly 3 further includes a fixing portion 34, such as Figure 3 and Figure 4 As shown, the fixing portion 34 includes a clamping portion provided 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 Figure 5 As shown, the fixing portion 34 includes a pressure component located above the placement platform 1. The pressure component is a plate-shaped structure used to press the free section of the welding strip near the end of the battery string. Figure 3 This is a partial schematic diagram of one side of the welding ribbon folding device according to an embodiment of the present invention. Figure 4 For the embodiment of the present invention Figure 3 Schematic diagram of the enlarged structure of area A in the middle; Figure 5 Another partial schematic diagram of one side of the welding ribbon folding device according to an embodiment of the present invention.

[0054] from Figure 3 and Figure 4 It can be seen that when the fixing portion 34 is a clamping portion, a plurality of fixing portions 34 can be provided corresponding to the number of free-segment welding strips, so that each fixing portion 34 can clamp a free-segment welding strip. Figure 4 As shown, the clamping portion includes: a first clamping end 41 and a second clamping end 42 that are arranged opposite to each other; when the free-segment 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 approach each other until the free-segment welding strip is clamped. For example, a spring can be used to elastically connect the first clamping end 41 and the second clamping end 42. During use, the spring between the first clamping end 41 and the second clamping end 42 is stretched by providing an external force so that a certain placement space is provided between the first clamping end 41 and the second clamping end 42. Then, the free-segment 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 welding strip under the action of the spring to restore the deformation.

[0055] In order to minimize the damage of the pressure component to the battery string during the pressing process, in an optional embodiment, as Figure 17 As shown, a flexible rubber pad 5 is provided on the side of the pressure component facing the battery string, so that when the pressure component presses the free section welding strip, it can provide a certain buffer to avoid hard contact between the pressure component and the battery string.

[0056] For different battery strings, the setting requirements for the busbar are different, but in order to minimize the shading of the busbar on the front side of the battery string, in a further optional embodiment, as Figure 1 and Figure 2 As shown, the placement platform 1 is placed horizontally; two folding and heating components 3 are provided, one on each side of the placement platform 1 in its lengthwise direction; and two fixing portions 34 are provided, one corresponding to the free-segment welding ribbons of different polarities at either end of the battery string. In other words, the welding ribbon folding device provided by the present invention can simultaneously fold the free-segment welding ribbons at both ends of the battery string, significantly improving the efficiency of folding the welding ribbons compared to folding the free-segment welding ribbons on one side.

[0057] from Figures 3 to 5 It can be seen that the two different structures of the fixing portion 34 provided in the embodiment of the present invention can both achieve the purpose of fixing the folded portion of the free section welding ribbon to the battery string. Therefore, the selection of the specific setting method can be set according to actual needs. For example, the free section welding ribbons at both ends of the battery string are both fixed to the battery string. Figure 3 and Figure 4 The clamping part shown is fixed, and the free section welding strips at both ends of the battery string are fixed with Figure 5 The pressure assembly shown is fixed, or the free section of the welding ribbon at one end of the battery string is fixed. Figure 3 and Figure 4 The clamping part shown is fixed, and the free section of the welding strip at the other end is fixed with Figure 5 The pressure components shown are used for fixing, etc., and the present invention does not make any specific limitations.

[0058] In an optional 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 portion 34 of the folding heating assembly 3 is a clamping portion provided on the placement platform 1, used to fix the free section of the welding ribbon extending from the front main surface; the fixing portion 34 of the folding heating assembly 3 is a pressure assembly located above the placement platform 1, used to fix the free section of the welding ribbon extending from the back main surface. In other words, Figure 5 The structure shown is Figure 3 and Figure 4 The structure shown is used to secure the different free-segment welding ribbons on the front and back main surfaces of a battery string. This is because the clamping portion is directly mounted on the placement platform 1, so the clamping height is generally limited. Furthermore, during the folding process, the battery string is typically placed with the front main surface facing the placement platform 1. Therefore, the free-segment welding ribbons on the front main surface side directly contact the placement platform 1. Therefore, the clamping portion is more suitable for securing the free-segment welding ribbons on the front main surface side of the battery string. However, the free-segment welding ribbons on the back main surface of the battery string are separated from the placement platform 1 by a certain distance (i.e., the thickness of the battery string itself), making it more suitable to be secured by downward pressure using a pressure assembly.

[0059] Furthermore, even if the free-segment welding strips at different locations are all folded toward the same main surface of the battery string, the specific locations of their folding may vary. For example, when the battery string is placed on the placement platform 1 with the back main surface facing upward, the free-segment welding strip located on the front main surface of the battery string needs to be folded from the front main surface of the battery string to the back main surface of the battery string. This means that the thickness of the battery string itself needs to be considered during the folding process. Therefore, a certain length is usually reserved for the thickness of the battery string during the folding process. However, since the free-segment welding strip located on the back main surface of the battery string is already located on the back main surface of the battery string, it remains on the back main surface of the battery string after folding. Therefore, the thickness of the battery string itself does not need to be considered during the folding process. This means that no length needs to be reserved during the folding process, and the free-segment welding strip can be directly folded. Therefore, for the free-segment welding strips located at different ends of the battery string, the specific locations of their folding points can be adjusted according to actual conditions, and the position of the fixing portion 34 can be adjusted accordingly to ensure that the unfolded portion of the free-segment welding strip is effectively fixed.

[0060] The embodiment of the present invention also takes into account the overall thickness of the battery string after the solder ribbon is folded, that is, the solder ribbon overlaps with the solder ribbon on the other side of the battery string after being folded, resulting in an increase in the local thickness of the edge area of ​​the battery string, which will increase the risk of battery cell cracking during the lamination process. Therefore, in a further optional embodiment, such as Figure 1 and Figure 2 As shown, the folding heating assembly 3 further includes: a moving portion 33; the moving portion 33 is connected to the control portion 32, and is used to drive the folding portion 31 and the control portion 32 to move horizontally along the second width direction. That is to say, in the embodiment of the present invention, during the folding of the free segment of the welding strip, the moving portion 33 is simultaneously used to achieve the staggered welding of the free segment of the welding strip. In an optional embodiment, the moving distance of the moving portion 33 is 1 mm ~ 3 mm, for example, 1 mm, 2 mm, 3 mm, etc. Preferably, after the moving portion 33 drives the folding portion 31 and the control portion 32 to move horizontally along the second width direction, each 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.

[0061] In an optional embodiment, as Figure 10 As shown, the moving part 33 can be composed of a screw slide, that is, through the cooperation between the ball screw and the guide rail, the folding part 31 and the control part 32 are driven to move horizontally along the second width direction.

[0062] In summary, the solder ribbon folding device provided in the embodiment of the present invention utilizes a preheating assembly to first adhere adhesive strips to the end regions of the main surface of the battery string, and then utilizes a folding heating assembly to fold and heat the free-segment solder ribbons in the battery string placed on the placement platform. The folded free-segment solder ribbons can then be bonded to the adhesive strips on the main surface of the battery string, thereby achieving the folding and fixation of the free-segment solder ribbons in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed solder ribbons can be directly layout-connected, eliminating the need to simultaneously fold the solder ribbons of multiple battery strings during the lamination process, greatly simplifying the manufacturing process.

[0063] Below Figure 11 Taking the above-mentioned welding ribbon folding device as an example, the folding process is specifically described. Figure 11 As shown, the soldering ribbon folding device provides a soldering ribbon folding method comprising the following steps:

[0064] Step S1101: Place the battery string on the placement platform 1 and adhere the adhesive strip 4 to the end area of ​​the main surface of the battery string using the preheating assembly 2;

[0065] In step S1102 , a portion of the free-segment solder strip is folded and heated using the folding and heating assembly 3 , so that the folded free-segment solder strip is bonded to the adhesive strip 4 located on the main surface of the battery string.

[0066] In order to ensure that the free section of the welding strip does not deviate during the folding process, in an optional embodiment, the present invention provides another folding method of the welding strip as follows: Figure 12 Shown, including:

[0067] Step S1201: Place the battery string on the placement platform 1 and adhere the adhesive strip 4 to the end area of ​​the main surface of the battery string using the preheating assembly 2;

[0068] Step S1202, using the fixing portion 34 to fix the bending position of the free section welding strip;

[0069] In step S1203 , a portion of the free-segment solder strip is folded and heated by using the folding and heating assembly 3 , so that the folded free-segment solder strip is bonded to the adhesive strip 4 on the main surface of the battery string.

[0070] As mentioned above, the fixing portion 34 provided in the embodiment of the present invention can be set in two different ways. Therefore, in a further optional embodiment, the fixing portion 34 in the folding heating component 3 is a clamping portion arranged on the placement platform 1, which is used to fix the free section of the welding strip extending from the front main surface; the fixing portion 34 in the folding heating component 3 is a pressure component located above the placement platform 1, which is used to fix the free section of the welding strip extending from the back main surface.

[0071] It should be noted that, in the case where the fixing portion 34 is a pressure component located above the placement platform 1, step S1203 can be as follows: Figure 13 As shown, specifically including:

[0072] Step S1301: using the folding heating assembly 3 to fold the free section of the free section welding ribbon 90° toward the main surface on one side in the thickness direction of the battery string;

[0073] Step S1302, moving the pressure assembly away from the free section of the welding strip;

[0074] Step S1303: Continue folding the free section of the welding ribbon by using the folding heating component 3 until it is folded 180°.

[0075] Furthermore, in step S1102 of the embodiment of the present invention, it can specifically include utilizing the control unit 32 and the moving unit 33 in the folding heating component 3 to cooperate to offset and fold the free section of the folded welding ribbon to the main surface on one side of the thickness direction of the battery string.

[0076] For example, after the folding heating component 3 folds the free section of the free section welding ribbon by 180°, the following can be done: Figure 14 and Figure 15 As shown. Among them, Figure 14 This is a schematic diagram of the local structure of the free section welding ribbon at one end of the battery string after the folding heating component 3 is folded. Figure 15 This is a partial structural diagram of the free section of the welding strip at the other end of the battery string after the folding heating component 3 is folded. Figure 14 and Figure 15 All of them are top views before the folded heating assembly 3 is removed, so the actual structure of the free section welding strip cannot be seen intuitively.

[0077] For example, the battery string obtained after the above step S1303 can be as follows Figure 16 As shown, Figure 16 The figure is a schematic diagram of the overall structure after the free sections of the welding strips at both ends of the battery string are folded. Figure 16 It can be seen that the free section of the welding ribbon is staggered for welding after being folded, that is, the extension direction of the free section of the welding ribbon after being folded is different from the extension direction of other welding ribbons on the battery string (that is, the welding ribbons between adjacent battery cells).

[0078] Below Figure 18 The preparation method of the photovoltaic laminate provided by the embodiment of the present invention is specifically described by taking as an example. Figure 18 As shown, the method for preparing a photovoltaic laminate provided by an embodiment of the present invention includes the following steps:

[0079] Step S1801, using a welding ribbon to connect multiple battery cells into a battery string, and at least one end of the battery string has a welding ribbon extending out of the end thereof to form a free section welding ribbon;

[0080] Step S1802 , providing a rubber strip 4 at the end area of ​​the main surface of the battery string;

[0081] Step S1803: Using the solder ribbon folding device of any of the aforementioned embodiments, the free section of the solder ribbon extending from the end of the battery string is folded, and the folded free section of the solder ribbon is bonded to the adhesive strip 4 located on the main surface of the battery string;

[0082] Step S1804, arranging the battery strings after the multiple folded welding ribbons, and connecting them in series or / and in parallel using bus bars to form a battery array;

[0083] Step S1805 , laminating the stacked back sheet, rear encapsulation film, cell array, front encapsulation film, and panel to obtain a photovoltaic laminate.

[0084] In a further optional embodiment, when a free-segment weld extends from the end of the front main surface of the battery string, a first transparent backing strip is also bonded to the end region of the front main surface; when a free-segment weld extends from the end of the back main surface of the battery string, a second transparent backing strip is also bonded to the end region of the front main surface opposite the back main surface of the end; 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 the additional first and second transparent backing strips, the distance between the front main surface and the laminate panel can be increased, ensuring that sufficient adhesive film can be filled between the front main surface and the laminate panel to reduce edge pressure during lamination.

[0085] In summary, the method for preparing a photovoltaic laminate provided by an embodiment of the present invention utilizes a preheating assembly to first adhere adhesive strips to the end areas of the main surface of a battery string during the folding process of the free-segment welding ribbon. The free-segment welding ribbons in the battery string placed on the placement platform are then folded and heated using a folding heating assembly. The folded free-segment welding ribbons can then be bonded to the adhesive strips on the main surface of the battery string, thereby achieving the folding and fixation of the free-segment welding ribbons in a single battery string. In the subsequent lamination process, multiple battery strings with folded and fixed welding ribbons can be directly connected for layout, eliminating the need to simultaneously fold the welding ribbons of multiple battery strings during the lamination process, greatly simplifying the preparation process.

[0086] The above steps are merely provided to help understand the structure, method, and core concept of the present invention. It will be apparent to those skilled in the art that various improvements and modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the claims of the present invention.

Claims

1. A welding ribbon folding device, characterized in that: Used to fold the free section of the welding ribbon extending from the end of the battery string, wherein the battery string is formed by connecting multiple battery cells in series with the welding ribbon, and at least one end of the battery string has a free section of the welding ribbon extending therefrom, and the welding ribbon folding device includes: A placement platform (1), the placement platform (1) is used to place the battery string; A preheating assembly (2), the preheating assembly (2) being used to at least partially bond a rubber strip (4) placed in an end region of the main surface of the battery string to the main surface of the battery string; A folding heating component (3) is provided on at least one side of the placement platform (1) in the length direction, and is used for placing a free section of the welding strip extending from the end of the battery string, folding the free section of the welding strip, and bonding the folded free section of the welding strip to the adhesive strip (4) located on the main surface of the battery string.

2. The welding ribbon folding device according to claim 1, characterized in that: The folding heating component (3) comprises: a folding portion (31) and a control portion (32); The folding portion (31) is a plate-shaped structure, and a heating element (312) for heating the free-segment welding strip is provided on the folding portion (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 portion (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 unit (31) and is used to drive the folding unit (31) to fold around a side edge in the length direction of the battery string as an axis.

3. The welding ribbon folding device according to claim 2, characterized in that: The folding heating component (3) further includes a fixing portion (34), the fixing portion (34) including a clamping portion provided 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 portion (34) includes a pressure component located above the placement platform (1), the pressure component being a plate-shaped structure for pressing the portion of the free section welding strip near the end of the battery string; or / and, The folding and heating assembly (3) further includes a moving portion (33), wherein the moving portion (33) is connected to the control portion (32) and is used to drive the folding portion (31) and the control portion (32) to move horizontally along the second width direction; or / and, The folding portion (31) is provided with at least one guide groove (311) for placing the free-segment welding strip.

4. The welding ribbon folding device according to claim 3, characterized in that: With respect to the structure in which the guide grooves (311) are provided on the folding portion (31), the number of the guide grooves (311) is the same as the number of the free-segment welding strips, and each guide groove (311) corresponds to one free-segment welding strip; Preferably, after the moving portion (33) drives the folding portion (31) and the control portion (32) to move horizontally along the second width direction, each guide groove (311) is staggered with the corresponding free section welding strip.

5. The welding ribbon folding device according to claim 1, characterized in that: The preheating assembly (2) includes, in addition to the heating portion (21), a driving portion (22), a support rod (23) and an adsorption portion (24); wherein, The driving portion (22) is used to drive the support rod (23) to move; The adsorption portion (24) and the heating portion (21) are both fixedly connected to the support rod (23), and the adsorption end of the adsorption portion (24) and the heating end of the heating portion (21) are both arranged toward the placement platform (1); the adsorption portion (24) is used to adsorb the adhesive strip (4) and move the adhesive strip (4) to a specified position under the drive of the driving portion (22); the heating portion (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.

6. The welding ribbon folding device according to claim 5, characterized in that: The end of the heating portion (21) is a semicircular structure, and the heating portions (21) are arranged at intervals along the length direction of the support rod (23).

7. The welding ribbon folding device according to any one of claims 1 to 6, characterized in that: Both ends of the battery string have extended free-segment welding strips, one end A extends from the front main surface of the battery string to form a free-segment welding strip, and one end B extends from the back main surface of the battery string to form a free-segment welding strip, and the front main surface and the back main surface are two surfaces arranged opposite to each other in the thickness direction of the battery string; The free section of the welding ribbon extending from the front main surface is folded from the end A to the back main surface, and the folded free section of the welding ribbon is bonded to the insulating tape pre-bonded to the end area A of the back main surface; The free section welding strip extending from the back main surface is folded from the B end to the back main surface, and the folded free section welding strip is bonded to the buffer strip pre-bonded to the B end area of ​​the back main surface.

8. The welding ribbon folding device according to claim 7, characterized in that: The folding heating component (3) includes a structure of a fixing portion (34). The fixing portion (34) in the folding heating component (3) is a clamping portion provided on the placement platform (1) and is used to fix the free section welding strip extending from the main surface; The fixing portion (34) in the folding heating component (3) is a pressure component located above the placement platform (1) and is used to fix the free section welding strip extending from the back main surface.

9. A method for preparing a photovoltaic laminate, characterized in that: The preparation method comprises: Step 1: Connecting a plurality of battery cells in series into a battery string using a welding ribbon, wherein at least one end of the battery string has a welding ribbon extending out of the end thereof to form a free section welding ribbon; Step 2, providing a rubber strip (4) at the end area of ​​the main surface of the battery string; Step 3, using the solder strip folding device according to any one of claims 1 to 8 to fold the free section of the solder strip extending from the end of the battery string, 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; Step 4, arranging the battery strings after the multiple welding ribbons are folded, and connecting them in series or / and in parallel using bus bars to form a battery array; Step 5: Laminating the stacked back sheet, rear encapsulation film, cell array, front encapsulation film and panel to obtain a photovoltaic laminate.

10. The method for preparing a photovoltaic laminate according to claim 9, characterized in that: When a free section is extended from the end of the main surface of the battery string, a first transparent gasket is also bonded to the end area of ​​the main surface; When a free section is extended from the end of the back main surface of the battery string, a second transparent gasket is also bonded to the end area of ​​the front main surface opposite to the back main surface of the end; The front main surface and the back main surface are two surfaces arranged opposite to each other in the thickness direction of the battery string.

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