Photovoltaic module and method of manufacturing the same

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a photovoltaic module and a preparation method thereof. The preparation method of the photovoltaic module comprises the following steps: providing a plurality of cell pieces distributed along a first direction, the cell piece comprising a center region and an edge region located on the opposite sides of the center region along the first direction; performing a welding process to electrically connect adjacent cell pieces via a plurality of welding ribbons arranged along a second direction, the second direction being perpendicular to the first direction; printing adhesive strips on the surface of the welding ribbons of the edge region and the center region by using a screen printing process, the length of the adhesive strip located on the edge region along the first direction being greater than the length of the adhesive strip along the second direction, and the length of the adhesive strip located on the center region along the first direction being less than the length of the adhesive strip located on the edge region along the first direction; and laying encapsulating adhesive film and a cover plate on the surface of the cell piece and performing lamination treatment. At least the stability of the photovoltaic module manufactured by the preparation method of the photovoltaic module can be improved.

Description

TECHNICAL FIELD

[0001] The embodiments of the present disclosure relate to the field of photovoltaics, and in particular to a photovoltaic module and a preparation method thereof. BACKGROUND

[0002] The manufacturing cost and power generation of photovoltaic crystalline silicon cell have become the main factors restricting its development. In terms of the manufacturing cost of crystalline silicon cell, silicon material accounts for 60-70% of the material cost, and the silver paste required for the cell grid line accounts for 20-30% of the material cost. Therefore, the previous bold proposal of the no master grid line technology is also the urgent desire for the goal of reducing the manufacturing cost of crystalline silicon cell, and this technology also helps to increase the effective illumination area of crystalline silicon cell and improve the power generation.

[0003] However, in the no master grid technology, the welding of the cell string is an important difficulty. In order to string the independent cell together to form a battery pack, the traditional method is to lay the solder strip soaked with flux on the master grid on the surface of the cell, and then melt the solder strip by high temperature to realize the welding of the solder strip and the cell. However, the surface of the no master grid cell has no master grid line, so the traditional welding process is not applicable. The photovoltaic module prepared by the current photovoltaic module preparation method still has the problem of poor stability. SUMMARY

[0004] The embodiments of the present disclosure provide a photovoltaic module and a preparation method thereof, which at least benefit to solve the problem of poor stability of the photovoltaic module prepared by the preparation method of the photovoltaic module.

[0005] According to some embodiments of the present disclosure, the embodiments of the present disclosure provide a preparation method of a photovoltaic module, comprising: providing a plurality of cell pieces distributed along a first direction, the cell piece comprising a center area and an edge area located on the opposite sides of the center area along the first direction; performing a welding process to electrically connect adjacent cell pieces through a plurality of solder strips arranged along a second direction, the second direction being perpendicular to the first direction; using a screen printing process to print adhesive strips on the surface of the solder strips in the edge area and the center area, the length of the adhesive strip in the edge area along the first direction being greater than the length of the adhesive strip along the second direction, and the length of the adhesive strip in the center area along the first direction being less than the length of the adhesive strip in the edge area along the first direction; laying encapsulating adhesive film and cover plate on the surface of the cell piece and performing lamination treatment.

[0006] In some embodiments, the distance between the adhesive strip and the edge of the cell piece along the first direction is less than or equal to 5mm.

[0007] In some embodiments, the length of the adhesive tape along the first direction near the edge of the battery cell along the first direction is greater than the length of the adhesive tape along the first direction away from the edge of the battery cell along the first direction.

[0008] In some embodiments, the ratio of the length of the adhesive tape along the first direction at the edge region to the length of the adhesive tape along the first direction at the center region is greater than or equal to 5.

[0009] In some embodiments, the length of the adhesive tape along the first direction at the edge region is 5mm-30mm.

[0010] In some embodiments, the length of the adhesive tape along the first direction near the edge of the battery cell along the second direction is greater than the length of the adhesive tape along the first direction away from the edge of the battery cell along the second direction.

[0011] In some embodiments, the thickness of the adhesive tape near the edge of the battery cell along the first direction is greater than the thickness of the adhesive tape away from the edge of the battery cell along the second direction; the thickness of the adhesive tape near the edge of the battery cell along the second direction is greater than the thickness of the adhesive tape away from the edge of the battery cell along the second direction.

[0012] In some embodiments, the thickness of the adhesive tape along a direction perpendicular to the surface of the battery cell is 0.1mm-0.35mm.

[0013] In some embodiments, the width of the adhesive tape along the second direction is greater than the width of the solder strip, and the adhesive tape covers the entire width of the solder strip along the second direction.

[0014] In some embodiments, the width of the adhesive tape near the edge of the battery cell along the first direction is greater than the width of the adhesive tape away from the edge of the battery cell along the first direction; the width of the adhesive tape near the edge of the battery cell along the second direction is greater than the width of the adhesive tape away from the edge of the battery cell along the second direction.

[0015] In some embodiments, printing the adhesive strip by using a screen printing process comprises: providing a screen printing adhesive screen, the screen printing adhesive screen having a plurality of through holes arranged in an array; placing the screen printing adhesive screen on the cell sheet such that the plurality of through holes correspond to the surface of the solder strip and the surface of the cell sheet where the adhesive strip is to be applied; performing screen printing to dispose adhesive in the plurality of through holes; and curing the adhesive to obtain the adhesive strip.

[0016] In some embodiments, the curing process of the adhesive is a UV curing process.

[0017] According to some embodiments of the present disclosure, another aspect of the present disclosure provides a photovoltaic module, comprising: a cell string, the cell string comprising a plurality of cell sheets arranged in a first direction, the cell sheets comprising a center region and edge regions located on opposite sides of the center region along the first direction, adjacent cell sheets being electrically connected via a plurality of solder strips arranged in a second direction, the second direction being perpendicular to the first direction, the solder strips on the edge regions and the center region having an adhesive strip, the adhesive strip on the edge regions having a length in the first direction greater than a length in the second direction, and the adhesive strip on the center region having a length in the first direction less than the length in the first direction of the adhesive strip on the edge regions; an encapsulating film for covering the surface of the cell string; and a cover plate for covering the surface of the encapsulating film away from the cell string.

[0018] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0019] The photovoltaic module fabrication method provided in this disclosure includes: firstly, providing a plurality of solar cells distributed along a first direction, each solar cell including a central region and edge regions located on opposite sides of the central region along the first direction; performing welding such that adjacent solar cells are electrically connected via a plurality of welding strips spaced apart along a second direction, the second direction being perpendicular to the first direction; screen printing adhesive strips on the surfaces of the welding strips in the edge regions and the central region, wherein the length of the adhesive strips in the edge regions along the first direction is greater than its length along the second direction, and the length of the adhesive strips in the central region along the first direction is less than its length in the edge regions along the first direction; and laying an encapsulating film and a cover plate on the surface of the solar cells and performing lamination. In related technologies, the connection between grid-less solar cells and welding strips generally uses a dispensing method, applying adhesive dots to the area where the welding strips and solar cells are connected, with the applied adhesive dots being uniformly distributed across the entire solar cell. However, in actual use of solar cells, there are alternating hot and cold environments. If only uniform adhesive dots are applied to the surface of the solar cell when connecting it to the solder ribbon, the alternating hot and cold cycles may damage the connection between the solar cell and the solder ribbon, thereby compromising the stability of the photovoltaic module and causing it to fail due to thermal cycling. The edges of the solar cell are areas more prone to failure due to alternating hot and cold cycles. This application divides the solar cell into a central area and edge areas located on opposite sides along the extension direction of the solder ribbon. Adhesive strips are printed on both the edge areas and the central area where the solar cell connects to the solder ribbon using screen printing. The adhesive strips in the edge areas, where thermal cycling failure is more likely to occur, are longer than those in the central area. Furthermore, the length of the adhesive strips in the edge areas along the extension direction of the solder ribbon is greater than that along the arrangement direction of the solder ribbon. In other words, the solder ribbons in the edge areas are elongated along the extension direction of the solder ribbon, which can cover a larger length of the solder ribbon. This allows for targeted protection of edge areas more susceptible to thermal cycling failure, reducing the probability of such failures in photovoltaic modules and thus improving the stability and reliability of the modules manufactured using this method. Furthermore, compared to adhesive dots printed using conventional dispensing processes, screen printing produces adhesive strips with a more uniform thickness, ensuring even coverage and connection of the area covered. This improves the bonding effect and further enhances the stability of the photovoltaic modules. Additionally, screen printing reduces production costs, increases production efficiency, and enhances process stability, achieving cost reduction and efficiency improvement. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example in the drawings and are described herein in connection with the appended drawings, which are not necessarily drawn to scale, where like references numerals designate corresponding parts throughout the drawings and various embodiments are depicted, unless otherwise specified. As exemplified by the appended drawings, structural and / or functional implementations of various embodiments disclosed herein can be provided in connection with one or more of the following figures:

[0021] Figure 1 A structural schematic diagram of a cell piece providing step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0022] Figure 2 A structural schematic diagram of a welding process step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0023] Figure 3 A structural schematic diagram of a screen printing screen providing step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0024] Figure 4 A structural schematic diagram of a printing adhesive tape step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0025] Figures 5 to 10 A structural schematic diagram of a printing adhesive tape step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0026] Figures 11 to 16 A structural schematic diagram of a printing adhesive tape step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0027] Figures 17 to 22 A structural schematic diagram of a printing adhesive tape step in a preparation method of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0028] Figure 23 A structural schematic diagram of a photovoltaic module according to an embodiment of the present disclosure is provided.

[0029] Figure 24 A structural schematic diagram of a cell piece in a photovoltaic module according to an embodiment of the present disclosure is provided. DETAILED DESCRIPTION

[0030] As known from the background, the photovoltaic module manufactured by the current photovoltaic module preparation method has poor stability.

[0031] In the related art, in order to make the battery string in the non-main grid battery have a relatively stable connection with the welding strip, a dispensing welding process can be used for processing. Specifically, glue points can be applied to the connection area between the welding strip and the battery sheet in a dispensing manner. The applied glue points are uniformly distributed on the entire battery sheet. The welding strip is fixed on the surface of the battery sheet through the glue points, which can improve the stability of the fixed connection between the welding strip and the battery sheet to a certain extent, and improve the stability of the photovoltaic module to a certain extent.

[0032] However, in the actual use process of the battery sheet, the environment temperature alternates between cold and hot. The photovoltaic module manufactured by the preparation method of the photovoltaic module using the above dispensing welding process may have a cold and hot cycle failure problem due to the cold and hot cycle. The dispensing of the partial area may cause the connection between the welding strip and the battery sheet to fail. The stability of the photovoltaic module manufactured by the preparation method of the photovoltaic module still needs to be improved.

[0033] The embodiment of the present disclosure provides a preparation method of a photovoltaic module. First, a plurality of battery sheets distributed along a first direction are provided. The battery sheet includes a center area and an edge area located on the opposite sides of the center area along the first direction. Welding is performed to electrically connect adjacent battery sheets through a plurality of welding strips arranged at intervals along a second direction. The second direction is perpendicular to the first direction. A glue strip is printed on the surface of the welding strip on the battery sheet by screen printing. Along the first direction, the length of the glue strip located in the edge area is greater than the length of the glue strip located in the center area. The glue strip in the edge area is in a long strip shape along the extension direction of the welding strip, which can cover a welding strip with a large length. Finally, an encapsulation glue film and a cover plate are laid on the surface of the battery sheet and laminated to obtain a photovoltaic module. By setting the length of the glue strip in the edge area to be greater than the length of the glue strip in the center area, and making the glue strip in the edge area in a long strip shape along the extension direction of the welding strip, the photovoltaic module can protect the area prone to cold and hot cycle failure. The probability of cold and hot cycle failure of the photovoltaic module is reduced, thereby improving the stability of the photovoltaic module manufactured by the preparation method of the photovoltaic module and improving the reliability of the photovoltaic module. In addition, the use of the screen printing process to form the glue strip can reduce the cost, improve the production efficiency, and further improve the stability of the photovoltaic module.

[0034] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present disclosure, many technical details are proposed in order to make the readers better understand the present disclosure. However, the technical solutions claimed by the present disclosure can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0035] Reference Figure 1, a plurality of battery pieces 100 distributed along a first direction X are provided, the battery piece 100 comprises a center area 101 and an edge area 102 located on the opposite sides of the center area 101 along the first direction X.

[0036] In some embodiments, the battery piece 100 can be a passivated emitter rear cell (PERC), a tunnel oxide passivated contact (TOPCon), a heterojunction with intrinsic thin-film (HJT), an interdigitated back contact (IBC), etc.

[0037] The edge area 102 of the battery piece 100 located on the opposite sides of the center area 101 along the first direction X is the area of the battery piece 100 that is prone to cold and hot cycle failure in actual use. In some embodiments, the length of the edge area 102 along the first direction X can be 1:1-1:5 of the length of the center area 101 along the first direction X. For example, the length of the edge area 102 along the first direction X can be 1:1, 1:2, 1:3, 1:4 or 1:5 of the length of the center area 101 along the first direction X, etc.

[0038] Reference Figure 2 A welding process is performed to electrically connect the adjacent battery pieces 100 via the plurality of solder strips 110 arranged along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0039] In some embodiments, the battery piece 100 has a plurality of fine grids (not shown in the figure) arranged along the first direction X, the fine grids are electrically connected to the battery piece 100 and extend along the second direction Y, i.e., the extension direction of the fine grids is perpendicular to the extension direction of the solder strips 110. When the battery piece 100 and the plurality of solder strips 110 are subjected to the welding process, the welding points of the solder strips 110 and the battery piece 100 can be located at the contact points of the solder strips 100 and the fine grids, so that the solder strips 100 can be electrically connected to the fine grids, realizing the electrical connection between the plurality of battery pieces 100 in the battery string.

[0040] However, it is difficult to form a stable connection between the solder strips 110 and the battery piece 100 through welding, and it is necessary to apply glue on the surfaces of the solder strips 110 and the battery piece 100 for further fixation, so as to improve the stability of the photovoltaic module produced.

[0041] Reference Figures 3 to 22The screen printing process is used to print the adhesive strip 120 on the surface of the solder strip 110 in the edge area 102 and the center area 101. The length of the adhesive strip 120 in the edge area 102 along the first direction X is greater than the length of the adhesive strip 120 along the second direction Y, and the length of the adhesive strip 120 in the center area 101 along the first direction X is less than the length of the adhesive strip 120 in the edge area 102 along the first direction X.

[0042] Figure 3 A structure diagram of a screen printing adhesive screen provided for an embodiment of the present disclosure is shown. Figure 4 A structure diagram of a step of applying an adhesive strip in a manufacturing method of a photovoltaic module provided for an embodiment of the present disclosure is shown. It should be noted that, Figure 3 A simplified structure diagram of a screen printing adhesive screen is shown. The actual screen printing adhesive screen is composed of many inclined and staggered copper wires, and the printing area is not entirely hollowed out.

[0043] Reference is made to Figures 3 to 4 In some embodiments, the screen printing process used to print the adhesive strip 120 can include: referring to Figure 3 A screen printing adhesive screen 200 is provided, and the screen printing adhesive screen 200 has a plurality of through holes 210 arranged at intervals. The pattern of the through holes on the screen printing adhesive screen corresponds to the pattern of the adhesive strip to be applied on the cell.

[0044] After the screen printing screen is provided, the screen printing adhesive screen 200 can be placed on the cell 100, so that the plurality of through holes 210 correspond to the surface of the solder strip 110 and the area of the cell 100 where the adhesive strip 120 needs to be applied, so as to perform subsequent screen printing process. The screen printing process is performed, and the glue is arranged in the plurality of through holes 210. Finally, the glue 120 also needs to be cured to obtain the adhesive strip 120.

[0045] It should be noted that in some embodiments, after the adhesive strip 120 is applied to one side surface of the cell 100 and the adhesive strip 120 is cured, the cell 100 needs to be flipped over, and the adhesive strip 120 is applied to the other side surface of the cell 100 and cured. The adhesive strip 120 application process in the entire cell string is completed.

[0046] In some embodiments, the curing process of the glue can be a UV curing method. The UV curing method is to cure the glue into the adhesive strip 120 by irradiating the glue with ultraviolet light. The UV curing method has high efficiency and can cure the glue in a short time. In addition, the UV curing method does not need to increase the temperature of the surface of the cell 100, and does not cause the cell 100 to warp, which can improve the yield of the photovoltaic module.

[0047] Specifically, the process time of the UV curing method for curing the glue can be 10s-70s. For example, the process time of the UV curing method can be 10s, 12s, 15s, 18s, 20s, 50s, 70s, 60s, or 70s, etc. The light intensity of the UV curing process can be 900MW / CM 2 -1800MW / CM 2 . For example, the light intensity of the UV curing process can be 900MW / CM 2 , 1000MW / CM 2 , 1100MW / CM 2 , 1200MW / CM 2 , 1500MW / CM 2 , or 1800MW / CM 2 , etc. If the process time of the UV curing process is too long or the light intensity is too large, the production efficiency will be reduced and the production cost will be wasted; if the process time of the UV curing process is too short or the light intensity is too small, the glue may not be completely cured into the glue strip 120, which will reduce the yield of the photovoltaic module. Therefore, the process time and light intensity of the UV curing process need to be selected in an appropriate range, and when the process time of the UV curing process is 10s-70s and the light intensity is 900MW / CM 2 -1800MW / CM 2 , both high production efficiency and low production cost can be achieved, and the glue can be completely cured into the glue strip 120 to improve the yield of the photovoltaic module.

[0048] In other embodiments, the process method for curing the glue can also be a heat curing method. The heat curing method is to cure the glue into the glue strip 120 by heating, which does not require additional curing equipment and can save part of the production cost.

[0049] With reference to the foregoing description, the following embodiments can be further understood. Figure 4In some embodiments, the distance between the adhesive strip 120 and the edge of the cell sheet 100 in the first direction X can be less than or equal to 5 mm. For example, the distance between the adhesive strip 120 and the edge of the cell sheet 100 in the first direction X can be 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or the like. Since the edge of the cell sheet 100 is a region where cold and hot cycle failure is more likely to occur, the closer the distance between the adhesive strip 120 and the edge of the cell sheet 100 in the first direction X, the better the effect of the adhesive strip 120 on avoiding cold and hot cycle failure, and the stronger the fixing effect of the adhesive strip 120. Similarly, the farther the distance between the adhesive strip 120 and the edge of the cell sheet 100 in the first direction X, the worse the effect of the adhesive strip 120 on avoiding cold and hot cycle failure, and the weaker the fixing effect of the adhesive strip 120. Therefore, the distance between the adhesive strip 120 and the edge of the cell sheet 100 in the first direction X should be small, and when the distance between the adhesive strip 120 and the edge of the cell sheet 100 is less than or equal to 5 mm, the adhesive strip 120 can have a better effect on avoiding cold and hot cycle failure, and the fixing effect of the adhesive strip 120 is stronger. Ideally, when the distance between the adhesive strip 120 and the cell sheet 100 in the first direction X is 0, the adhesive strip 120 can have the best effect on avoiding cold and hot cycle failure.

[0050] It should be noted that the edge of the cell sheet 100 in the first direction X has the characteristic of cold and hot cycle failure, and the closer to the edge of the cell sheet 100 in the first direction X, the higher the probability of cold and hot cycle failure. The embodiments of the present disclosure can control the fixing strength of the solder strip 120 on the cell sheet 100 in different regions in the first direction X by controlling the length of the adhesive strip 120 in the first direction X. The longer the length of the adhesive strip 120 in the first direction X, the larger the area of the solder strip 110 covered by the adhesive strip 120, the stronger the effect of the adhesive strip 120 on fixing the solder strip 110 and the cell sheet 100, the more conducive to avoiding cold and hot cycle failure, and the more capable of improving the stability of the photovoltaic module. The length of the adhesive strip 120 in the first direction X at different positions of the cell sheet 100 in the first direction X will be described in detail below.

[0051] Reference Figure 5In some embodiments, in the first direction X, the length of the adhesive tape 120 close to the edge of the battery sheet 100 in the first direction X can be greater than the length of the adhesive tape 120 away from the edge of the battery sheet 100 in the first direction X. It can be understood that in the first direction X, the length of the adhesive tape 120 in the first direction X can gradually increase from the center of the battery sheet 100 to the two side edges. Correspondingly, in the first direction X, the closer to the edge of the battery sheet 100, the longer the length of the adhesive tape 120, the larger the area of the solder strip covered by the adhesive tape 120, the stronger the fixing effect of the adhesive tape 120 on the solder strip 110, and the more able to avoid the cold and hot cycle failure in the photovoltaic module. The adhesive tape 120 can provide different intensity of fixed protection for the areas in the photovoltaic module with different cold and hot cycle failure risks, further reduce the risk of cold and hot cycle failure of the photovoltaic module, and improve the stability of the photovoltaic module.

[0052] Reference Figure 6 In some embodiments, in the first direction X, the length of the adhesive tape 120 close to the edge of the battery sheet 100 in the first direction X can also be equal to the length of the adhesive tape 120 away from the edge of the battery sheet 100 in the first direction X. That is, in the first direction X, the lengths of the adjacent adhesive tapes 120 in the first direction X can be the same. Compared with the scheme that in the first direction X, the closer to the edge of the battery sheet 100, the longer the length of the adhesive tape 120, the same length of the adjacent adhesive tapes 120 means that the failure risks of different areas of the battery sheet 100 in the first direction X can be divided by gradient, which can provide different intensity of fixed connection for different failure risk areas to reduce the cold and hot cycle failure risk of the photovoltaic module, while reducing the area of the adhesive tape covering the battery sheet as much as possible, increasing the effective light utilization area of the battery sheet surface, improving the performance of the battery sheet, and providing different intensity of fixed protection for different areas of the battery sheet 100, and reducing the production difficulty and the process complexity to a certain extent.

[0053] Reference Figure 7In some embodiments, in the first direction X, the length of the one or more adhesive strips 120 near the edge of the cell sheet 100 in the first direction X can be a first length, and the length of the other adhesive strips in the middle in the first direction X can be a second length, the first length being greater than the second length. Specifically, the one or more adhesive strips 120 near the edge of the cell sheet 100 in the first direction X can be set to the same length, and the remaining adhesive strips 120 can be set to another length, and the length of the edge adhesive strips 120 is greater. In this way, on the basis of the above-mentioned scheme of making the lengths of the adjacent adhesive strips 120 in the first direction X the same, the process difficulty and complexity can be further reduced, the effective light utilization area of the cell sheet surface can be further increased, the performance of the cell sheet can be further improved, and the effect of applying different degrees of protection to different regions of the cell sheet 100 can still be achieved.

[0054] In some embodiments, the ratio of the length of the adhesive strip 120 in the edge region 102 in the first direction X to the length of the adhesive strip 120 in the center region 101 in the first direction X can be greater than or equal to 5. For example, the ratio of the length of the adhesive strip 120 in the edge region 102 in the first direction X to the length of the adhesive strip 120 in the center region 101 in the first direction X can be 5, 6, 8, 10, 30, 50, 100, etc. Since in the actual use of the photovoltaic module, the solder strip 110 located at the edge is most likely to fail due to cold and hot cycles, although the solder strip 110 located at the center also has a certain possibility of failure due to cold and hot cycles, the probability of failure due to cold and hot cycles in the center region 101 is much smaller than that in the edge region 102. Setting the length of the adhesive strip in the edge region 102 to be relatively large can effectively protect the connection between the solder strip 110 and the cell sheet 100 in the edge region 102, improve the stability of the photovoltaic module, and setting the length of the adhesive strip 120 in the center region 101 to be relatively small can reduce the amount of glue used on one hand, and on the other hand, it can also reduce the area of the cell sheet 100 covered by the adhesive strip 120, so that a larger area of the cell sheet 100 can be used as an effective light absorption surface, improve the light utilization rate, and improve the performance of the photovoltaic module. Therefore, when the ratio of the length of the adhesive strip 120 in the edge region 102 in the first direction X to the length of the adhesive strip 120 in the center region 101 in the first direction X is greater than or equal to 5, the connection between the solder strip 110 and the cell sheet 100 can be protected to a greater extent, the stability of the photovoltaic module can be improved, and the photovoltaic module can have better performance.

[0055] In some embodiments, the length of the adhesive tape 120 located at the edge area 102 along the first direction X can be 5-30 mm. For example, the length of the adhesive tape 120 located at the edge area 102 along the first direction X can be 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, etc. If the length of the adhesive tape 120 located at the edge area 102 along the first direction X is too small, the fixing strength between the solder strip 110 and the battery piece 100 at the edge area 102 can be insufficient, and the problem of cold and hot cycle failure of the edge of the battery piece 100 can still occur. If the length of the adhesive tape 120 located at the edge area 102 along the first direction X is too large, the adhesive tape 120 will cover a large area of the surface of the battery piece 100, thereby reducing the area of the effective light absorption surface of the battery piece 100, affecting the light utilization rate, and affecting the performance of the photovoltaic module. Therefore, the length of the adhesive tape 120 located at the edge area 102 along the first direction X needs to be selected in an appropriate range. When the length of the adhesive tape 120 located at the edge area 102 along the first direction X is 5-30 mm, the problem of cold and hot cycle failure of the edge of the battery piece 100 can be effectively solved, and the battery piece 100 has a large effective light absorption surface, a large light utilization rate, and strong performance of the photovoltaic module.

[0056] It should be noted that the edge of the battery piece 100 along the second direction Y also has the characteristics of cold and hot cycle failure, and the closer to the edge of the battery piece 100 along the second direction Y, the higher the probability of cold and hot cycle failure, that is, the closer the solder strip to the edge of the battery piece 100 along the second direction Y, the more likely to occur cold and hot cycle failure. The embodiments of the present disclosure can control the fixing strength of the solder strip 120 on the battery piece 100 in different areas along the second direction Y by controlling the length of the adhesive tape 120 along the first direction X. The longer the length of the adhesive tape 120 along the first direction X, the larger the area of the adhesive tape 120 covering the solder strip 110, the stronger the effect of the adhesive tape 120 fixing the solder strip 110 and the battery piece 100, which is more conducive to avoiding cold and hot cycle failure and improving the stability of the photovoltaic module. The length of the adhesive tape 120 located at different positions of the battery piece 100 along the second direction Y along the first direction X will be described in detail below.

[0057] Reference Figure 8In some embodiments, in the second direction Y, the length of the adhesive tape 120 close to the edge of the battery sheet 100 in the second direction Y in the first direction X can be greater than the length of the adhesive tape 120 away from the edge of the battery sheet 100 in the second direction Y in the first direction X. It can be understood that in the second direction Y, the length of the adhesive tape 120 in the first direction X from the center of the battery sheet 100 to the two side edges can gradually increase. Correspondingly, in the second direction Y, the closer to the edge of the battery sheet 100, the longer the length of the adhesive tape 120, the larger the area of the solder strip 110 covered by the adhesive tape 120, the stronger the fixing effect of the adhesive tape 120 on the solder strip 100, and the more able to avoid the cold and hot cycle failure in the photovoltaic module. The adhesive tape 120 can provide different intensity of fixed protection for the areas in the photovoltaic module with different cold and hot cycle failure risks, further reduce the risk of cold and hot cycle failure of the photovoltaic module, and improve the stability of the photovoltaic module.

[0058] Reference Figure 9 In some embodiments, in the second direction Y, the length of the adhesive tape 120 close to the edge of the battery sheet 100 in the second direction Y in the first direction X can also be equal to the length of the adhesive tape 120 away from the edge of the battery sheet 100 in the second direction Y in the first direction X. That is, in the second direction Y, the lengths of the adjacent adhesive tapes 120 in the first direction X can be the same. Compared with the scheme that in the second direction Y, the closer to the edge of the battery sheet 100, the longer the length of the adhesive tape 120, the same length of the adjacent adhesive tapes 120 means that the failure risks of different areas of the battery sheet 100 in the second direction Y can be gradiently divided, and different intensity of fixed connection can be provided for different failure risk areas to reduce the cold and hot cycle failure risk of the photovoltaic module, while the area of the adhesive tape covering the battery sheet is reduced as much as possible, the effective light utilization area of the surface of the battery sheet is increased, and the performance of the battery sheet is improved. Different intensity of fixed protection can be provided for different areas of the battery sheet 100, and the production difficulty and the process complexity can be reduced to a certain extent.

[0059] Reference Figure 10In some embodiments, in the second direction Y, the length of the one or more adhesive strips 120 close to the edge of the cell sheet in the first direction X can be a third length, and the length of the other adhesive strips 120 in the middle in the first direction X can be a fourth length, and the third length is greater than the fourth length. Specifically, one or two adhesive strips 120 close to the edge of the cell sheet 100 in the second direction Y can be set to the same length, and the remaining adhesive strips 120 are set to another length, and the length of the edge adhesive strip 120 is larger. In this way, on the basis of the above-mentioned scheme of making the lengths of the adjacent adhesive strips 120 in the second direction Y the same, the process difficulty and the process complexity can be further reduced, the effective light utilization area of the cell sheet surface can be further increased, the performance of the cell sheet can be further improved, and the effect of applying different degrees of protection to different regions of the cell sheet can still be achieved.

[0060] It should be noted that the edge of the cell sheet 100 in the first direction X and the edge of the cell sheet 100 in the second direction Y both have the characteristics of being prone to failure in cold and hot cycles, and the closer to the edge of the cell sheet 100 in the first direction X or the second direction Y, the higher the probability of failure in cold and hot cycles. The disclosed embodiments can also control the fixing strength of the solder strip 110 on the cell sheet 100 in different regions in the first direction X and in the second direction Y by controlling the thickness of the adhesive strip 120. The thicker the thickness of the adhesive strip 120, the stronger the effect of the adhesive strip 120 on fixing the solder strip 110, the more conducive to avoiding failure in cold and hot cycles, and the more capable of improving the stability of the photovoltaic module. The thickness of the adhesive strip 120 at different positions of the cell sheet in the first direction X and in the second direction Y will be described in detail below.

[0061] Reference Figures 11 to 12 In some embodiments, Figure 11 One structure of the adhesive strip application step in the preparation method of the photovoltaic module provided by the disclosed embodiments is shown in a side view structure diagram in the second direction. Reference Figure 11 In the first direction X, the thickness of the adhesive strip 120 close to the edge of the cell sheet 100 in the first direction X can be greater than the thickness of the adhesive strip 120 away from the edge of the cell sheet 100 in the second direction Y. It can be understood that in the first direction X, the thickness of the adhesive strip 120 from the center of the cell sheet 100 to the two side edges can gradually increase. Correspondingly, in the first direction X, the closer to the edge of the cell sheet 100, the thicker the thickness of the adhesive strip 120, the stronger the fixing effect of the adhesive strip 120 on the solder strip 100, and the more capable of avoiding the occurrence of cold and hot cycle failure in the photovoltaic module, so that the adhesive strip 120 can provide different intensity of fixed protection for the regions with different cold and hot cycle failure risks in the photovoltaic module, further reduce the risk of cold and hot cycle failure of the photovoltaic module, and improve the stability of the photovoltaic module.

[0062] Figure 12A structure of the step of applying the adhesive tape in the method of manufacturing the photovoltaic module provided by the embodiments of the present disclosure is shown in a side view along the first direction. Referring to Figure 12 In the second direction Y, the thickness of the adhesive tape 120 close to the edge of the cell sheet 100 in the second direction Y can be greater than the thickness of the adhesive tape 120 away from the edge of the cell sheet 100 in the second direction Y. It can be understood that in the second direction Y, the thickness of the adhesive tape 120 gradually increases from the center of the cell sheet 100 to the two side edges. Correspondingly, in the second direction Y, the closer to the edge of the cell sheet 100, the thicker the thickness of the adhesive tape 120, the stronger the fixing effect of the adhesive tape 120 on the solder strip 100, and the more able to avoid the cold and hot cycle failure in the photovoltaic module, so that the adhesive tape 120 can provide different intensity of fixed protection for the areas in the photovoltaic module with different cold and hot cycle failure risks, further reduce the risk of cold and hot cycle failure of the photovoltaic module, and improve the stability of the photovoltaic module.

[0063] It should be noted that, Figure 12 The shape of the solder strip 110 shown in the side view along the first direction in the following and other side views is rectangular, and in some embodiments, the shape of the solder strip can also be circular or triangular (not shown in the figure). The shape of the solder strip refers to the cross-sectional shape of the solder strip in the first direction X.

[0064] Referring to Figures 13 to 14 In some embodiments, Figure 13 A structure of the step of applying the adhesive tape in the method of manufacturing the photovoltaic module provided by the embodiments of the present disclosure is shown in a side view along the second direction. Referring to Figure 13 In the first direction X, the thickness of the adhesive tape 120 close to the edge of the cell sheet 100 in the first direction X can also be equal to the thickness of the adhesive tape 120 away from the edge of the cell sheet 100 in the first direction X. That is, in the first direction X, the thickness of the adjacent adhesive tapes 120 can be the same. Compared with the scheme that the closer to the edge of the cell sheet 100, the thicker the thickness of the adhesive tape 120 in the first direction X, the same thickness of the adjacent adhesive tapes 120 means that the failure risk of the cell sheet 100 in different areas in the first direction X can be divided by gradient, which can provide different intensity of fixed connection for different failure risk areas to reduce the cold and hot cycle failure risk of the photovoltaic module, while minimizing the thickness of the adhesive tape in the photovoltaic module, leaving a larger thickness space for the encapsulation adhesive film, improving the reliability of the photovoltaic module, which can provide different intensity of fixed protection for different areas of the cell sheet 100, and to a certain extent, reduce the production difficulty and reduce the process complexity.

[0065] Figure 14A structure of the step of applying the adhesive tape in the method of manufacturing the photovoltaic module provided by the embodiments of the present disclosure is shown in a side view along the first direction. Refer to Figure 14 In the second direction Y, the thickness of the adhesive tape 120 close to the edge of the cell sheet 100 in the second direction Y can also be equal to the thickness of the adhesive tape 120 away from the edge of the cell sheet 100 in the second direction Y. That is, in the second direction Y, the thickness of the adjacent adhesive tapes 120 can be the same. Compared with the scheme that the thickness of the adhesive tape 120 close to the edge of the cell sheet 100 in the second direction Y is thicker, the same thickness of the adjacent adhesive tapes 120 means that the failure risks of different regions of the cell sheet 100 in the second direction Y can be divided in a gradient manner, and the adhesive tapes occupy a thickness space in the photovoltaic module as much as possible, so as to provide a larger thickness space for the encapsulation film and improve the reliability of the photovoltaic module. In addition, the different strengths of the fixed connection can be provided for different failure risk regions to reduce the cold and hot cycle failure risk of the photovoltaic module, and the production difficulty and the process complexity can be reduced to a certain extent.

[0066] Refer to Figures 15 to 16 In some embodiments, Figure 15 A structure of the step of applying the adhesive tape in the method of manufacturing the photovoltaic module provided by the embodiments of the present disclosure is shown in a side view along the second direction. Refer to Figure 15 In the first direction X, the thickness of one or more adhesive tapes 120 close to the edge of the cell sheet 100 can be a first thickness, and the thickness of the other adhesive tapes 120 located in the middle can be a second thickness, and the first thickness is greater than the second thickness. Specifically, one or two adhesive tapes 120 close to the edge of the cell sheet 100 in the first direction X can be set to the same thickness, and the remaining adhesive tapes 120 can be set to another thickness, and the thickness of the edge adhesive tape 120 is thicker. In this way, on the basis of the above-mentioned scheme that the adjacent adhesive tapes 120 in the second direction Y have the same thickness, the process difficulty and the process complexity can be further reduced, the reliability of the photovoltaic module can be further improved, and the adhesive tapes can still play a certain role in protecting different regions of the cell sheet to a certain extent.

[0067] Figure 16 A structure of the step of applying the adhesive tape in the method of manufacturing the photovoltaic module provided by the embodiments of the present disclosure is shown in a side view along the first direction. Refer to Figure 16In the second direction Y, the thickness of one or more adhesive strips 120 near the edge of the cell sheet can be a third thickness, and the thickness of the other adhesive strips 120 in the middle can be a fourth thickness. The third thickness is greater than the fourth thickness. Specifically, one or two adhesive strips 120 near the edge of the cell sheet 100 in the second direction Y can be set to the same thickness, and the remaining adhesive strips 120 can be set to another thickness, and the thickness of the edge adhesive strips 120 is thicker. In this way, based on the above scheme of making the adjacent adhesive strips 120 in the second direction Y have the same thickness, the process difficulty and complexity can be further reduced, the reliability of the photovoltaic module can be further improved, and the different degrees of protection of different areas of the cell sheet can still be achieved.

[0068] It should be noted that when using a screen printing process to apply adhesive strips 120 of different thicknesses on the surface of the cell sheet 100 and the solder strip 110, screen printing screens of different thicknesses can be selected according to the thickness of the adhesive strips 120. The screen printing screens of different thicknesses are placed on the cell sheet 100 in turn, and the screen printing process is performed multiple times. Finally, a photovoltaic module with adhesive strips 120 of different thicknesses in different areas of the cell sheet 100 can be obtained.

[0069] In addition, Figures 11 to 16 The difference in thickness between the different solder strips 110 shown does not represent the actual difference in thickness between the different solder strips 110 in the actual product, but only represents the relative relationship between the thicknesses of the solder strips 110 at different positions.

[0070] In some embodiments, in the direction perpendicular to the surface of the cell sheet 100, the thickness of the adhesive strip 120 can be 0.1mm-0.35mm. For example, in the direction perpendicular to the surface of the cell sheet 100, the thickness of the adhesive strip 120 can be 0.5mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm or 0.35mm, etc. If the thickness of the adhesive strip 120 is too thick, it will occupy the space of the encapsulation adhesive film 300 in the middle of the photovoltaic module, so that the thickness of the encapsulation adhesive film 300 in the area corresponding to the adhesive strip 120 is too small, which will reduce the reliability of the photovoltaic module in this area. If the thickness of the adhesive strip 120 is too thin, it will reduce the fixing effect of the adhesive strip 120 on the solder strip 110 and the cell sheet 100, which will affect the stability of the photovoltaic module and make it difficult to play a better role in preventing cold and hot cycle failure. Therefore, the thickness of the adhesive strip 120 needs to be selected within a suitable range in the direction perpendicular to the surface of the cell sheet 100. When the thickness of the adhesive strip 120 is 0.1mm-0.35mm, the reliability of the photovoltaic module can be ensured to be relatively high, and the adhesive strip 120 can play a better role in preventing cold and hot cycle failure, thereby improving the stability of the photovoltaic module.

[0071] It should be noted that the battery piece 100 has the characteristics of being prone to cold and hot cycle failure at the edge along the first direction X and at the edge along the second direction Y, and the closer to the edge of the battery piece 100 along the first direction X or the second direction Y, the higher the probability of cold and hot cycle failure. The embodiments of the present disclosure can also control the fixing strength of the solder strip 110 on the battery piece 100 in different areas along the first direction X and along the second direction Y by controlling the width of the adhesive tape 120 along the second direction Y. The wider the width of the adhesive tape 120, the stronger the effect of the adhesive tape 120 on fixing the solder strip 110, the more conducive to avoiding cold and hot cycle failure, and the more capable of improving the stability of the photovoltaic module. The width of the adhesive tape 120 along the second direction Y at different positions of the battery piece along the first direction X and along the second direction Y will be described in detail below.

[0072] With reference to Figure 17 In some embodiments, the width of the adhesive tape 120 along the second direction Y can be greater than the width of the solder strip 110, and the adhesive tape 120 covers the entire width of the solder strip 110 along the second direction Y. That is, the adhesive tape 120 can cover the entire width of the solder strip 100 along the second direction Y, and the adhesive tape 120 can cover the partial area of the battery piece 100 adjacent to the solder strip 110 on both sides along the second direction Y. In this way, the adhesive tape 120 can have a better fixing effect on this part of the solder strip 110, so that the solder strip 110 and the battery piece 100 are tightly bonded together, effectively avoiding the occurrence of cold and hot cycle failure.

[0073] With reference to Figures 17 to 18 In some embodiments, with reference to Figure 17 Along the first direction X, the width of the adhesive tape 120 close to the edge of the battery piece 100 along the first direction X can be greater than the width of the adhesive tape 120 away from the edge of the battery piece 100 along the first direction X. Along the first direction X, the closer to the edge of the battery piece 100, the wider the width of the adhesive tape 120, the stronger the fixing effect of the adhesive tape 120 on the solder strip 100, and the more capable of avoiding the occurrence of cold and hot cycle failure in the photovoltaic module. With reference to Figure 18In the second direction Y, the width of the adhesive tape 120 close to the edge of the battery sheet 100 in the second direction Y is greater than the width of the adhesive tape 120 away from the edge of the battery sheet 100 in the second direction Y. In the second direction Y, the closer to the edge of the battery sheet 100, the wider the width of the adhesive tape 120, the stronger the fixing effect of the adhesive tape 120 on the welding strip 100, and the more likely to avoid the cold and hot cycle failure of the photovoltaic module. The adhesive tape with a width gradually increasing from the center of the battery sheet 100 to the edge of the battery sheet 100 in the first direction X and the second direction Y can enable the adhesive tape 120 to provide different intensity of fixed protection for the areas in the photovoltaic module with different cold and hot cycle failure risks, further reduce the risk of cold and hot cycle failure of the photovoltaic module, and improve the stability of the photovoltaic module.

[0074] Reference Figures 19 to 20 In some embodiments, the reference Figure 19 In the first direction X, the width of the adhesive tape 120 close to the edge of the battery sheet 100 in the first direction X can also be equal to the width of the adhesive tape 120 away from the edge of the battery sheet 100 in the first direction X. That is, in the first direction X, the widths of adjacent adhesive tapes 120 can be the same. Reference Figure 20 In the second direction Y, the width of the adhesive tape 120 close to the edge of the battery sheet 100 in the second direction Y can also be equal to the width of the adhesive tape 120 away from the edge of the battery sheet 100 in the second direction Y. That is, in the second direction Y, the widths of adjacent adhesive tapes 120 can be the same. Compared with the scheme that the closer to the edge of the battery sheet 100, the wider the width of the adhesive tape 120 in the first direction X and the second direction Y, the same width of adjacent adhesive tapes 120 means that the failure risks of different areas of the battery sheet 100 can be gradiently divided, and different intensity of fixed connection can be provided for different failure risk areas to reduce the cold and hot cycle failure risk of the photovoltaic module, while the area of the adhesive tape covering the battery sheet is reduced as much as possible, the effective light utilization area of the battery sheet surface is increased, the performance of the battery sheet is improved, and different intensity of fixed protection can be provided for different areas of the battery sheet 100, and the production difficulty and process complexity can be reduced to a certain extent.

[0075] Reference Figures 21 to 22 In some embodiments, the reference Figure 21 In the first direction X, the width of one or more adhesive tapes 120 close to the edge of the battery sheet 100 can be a first width, and the width of the other adhesive tapes 120 located in the middle can be a second width, the first width being greater than the second width. Specifically, one or two adhesive tapes 120 close to the edge of the battery sheet 100 in the first direction X can be set to the same width, and the remaining adhesive tapes 120 can be set to another width, and the edge adhesive tape 120 has a wider width. Reference Figure 22In the second direction Y, the width of one or more adhesive strips 120 close to the edge of the battery piece can be a third width, and the width of the other adhesive strips 120 in the middle can be a fourth width. The third width is greater than the fourth width. Specifically, one or two adhesive strips 120 close to the edge of the battery piece 100 in the second direction Y can be set to the same width, and the remaining adhesive strips 120 can be set to another width, and the width of the edge adhesive strip 120 is wider. In this way, on the basis of the above-mentioned scheme of making the adjacent adhesive strips 120 have the same width in the first direction X or the second direction Y, the process difficulty and the process complexity can be further reduced, the effective light utilization area of the battery piece surface can be further increased, the performance of the battery piece can be further improved, and the effect of applying different degrees of protection to different areas of the battery piece can still be achieved.

[0076] Reference Figure 23 The encapsulation adhesive film 300 and the cover plate 400 are laid on the surface of the battery piece 100 and are subjected to lamination treatment. After the lamination treatment, the encapsulation adhesive film 300 can fill the gap between the adjacent cover plates 400 and the battery string.

[0077] The preparation method of the photovoltaic module provided by the embodiment of the present disclosure first provides a plurality of battery pieces distributed along a first direction, the battery piece includes a center area and an edge area on the opposite sides of the center area along the first direction; welding is performed to make the adjacent battery pieces electrically connected via a plurality of welding ribbons arranged at intervals along a second direction, the second direction is perpendicular to the first direction; screen printing is performed to print adhesive strips on the welding ribbons, the length of the adhesive strip in the edge area along the first direction is greater than the length along the second direction, and the length of the adhesive strip in the edge area is greater than the length of the adhesive strip in the center area; and finally, an encapsulation adhesive film and a cover plate are formed, and the photovoltaic module is subjected to lamination treatment. In this way, the area prone to cold and hot cycle failure is protected, the stability of the photovoltaic module manufactured by the preparation method of the photovoltaic module can be improved, and the reliability of the photovoltaic module can be improved. In addition, the screen printing process can also reduce the cost, improve the production efficiency, and further improve the stability of the photovoltaic module.

[0078] Correspondingly, another embodiment of the present disclosure also provides a photovoltaic module, and the photovoltaic module provided by the another embodiment of the present disclosure is prepared by the preparation method of the photovoltaic module in the above-mentioned embodiment. The photovoltaic module provided by the another embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. The same or corresponding parts as the previous embodiment can refer to the corresponding description of the previous embodiment, and will not be described in detail below.

[0079] Reference Figures 23 to 24The photovoltaic module comprises: a cell string, the cell string comprising a plurality of cell pieces 100 distributed along a first direction X, the cell piece 100 comprising a center region 101 and an edge region 102 located on opposite sides of the center region 101 along the first direction X, adjacent cell pieces 100 being electrically connected via a plurality of welding ribbons 110 arranged at intervals along a second direction Y, the second direction Y being perpendicular to the first direction X, the edge region 102 and the welding ribbons 110 on the surface of the center region 101 being provided with adhesive strips, the length of the adhesive strip 120 located on the edge region 102 along the first direction X being greater than the length of the adhesive strip 120 along the second direction Y, and the length of the adhesive strip 120 located on the center region 101 along the first direction X being less than the length of the adhesive strip 120 located on the edge region 102 along the first direction X; an encapsulating film 300 for covering the surface of the cell string; and a cover plate 400 for covering the surface of the encapsulating film 300 away from the cell string.

[0080] In some embodiments, the cell piece 100 in the cell string can be a passivated emitter rear cell (PERC), a tunnel oxide passivated contact (TOPCon), a heterojunction with intrinsic thin-film (HJT), an interdigitated back contact (IBC), or the like.

[0081] The encapsulating film 300 is used to bond the cell string and the cover plate 400. In some embodiments, the material of the encapsulating film 300 can comprise EVA, POE, PVB, or the like. The encapsulating film 140 can protect the cell string, prevent the external environment from affecting the performance of the cell string 130, and has a certain bonding strength.

[0082] In some embodiments, the material of the cover plate 400 can be glass. Glass has a low water permeability, and using the glass cover plate 400 can effectively block water vapor in the external environment from entering the photovoltaic module through the cover plate 400, thereby reducing the corrosion of water vapor on the cell string and the hydrolysis of the encapsulating film 300, and to some extent, the service life of the photovoltaic module can be improved.

[0083] In other embodiments, the material of the cover plate 400 can also be an organic polymer material.

[0084] The photovoltaic module provided by the embodiments of the present disclosure includes a cell string, an encapsulation adhesive film covering the surface of the cell string, and a cover plate covering the surface of the encapsulation adhesive film away from the cell string. The cell string includes a plurality of cell pieces arranged along a first direction. The cell piece includes a center region and an edge region located on the opposite sides of the center region along the first direction. Adjacent cell pieces are connected via a plurality of solder strips. The solder strips are arranged at intervals along a second direction. The second direction is perpendicular to the first direction. The solder strip surface of the edge region and the center region each has an adhesive strip. The length of the adhesive strip of the edge region in the first direction is greater than the length in the second direction. In other words, the adhesive strip of the edge region is strip-shaped along the extension direction of the solder strip, and the length of the adhesive strip of the edge region is greater than the length of the adhesive strip of the center region. In this way, the adhesive strip of the edge region can specifically protect the area prone to cold and hot cycle failure, improve the stability of the photovoltaic module manufactured by the preparation method of the photovoltaic module, and improve the reliability of the photovoltaic module.

[0085] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present disclosure, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present disclosure. Any person skilled in the art can make respective changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure should be limited by the scope defined by the claims.

Claims

1. A method of making a photovoltaic module, characterized by, The application comprises: providing a plurality of battery pieces distributed along a first direction, the battery pieces comprising a center region and edge regions located on opposite sides of the center region along the first direction; performing a soldering process to electrically connect adjacent battery pieces via a plurality of solder strips arranged along a second direction perpendicular to the first direction; applying a screen printing process to print adhesive strips on the solder strip surfaces of the edge regions and the center region, the length of the adhesive strips in the first direction in the edge regions being greater than the length of the adhesive strips in the second direction, and the length of the adhesive strips in the first direction in the center region being less than the length of the adhesive strips in the first direction in the edge regions; laying encapsulation adhesive film and a cover plate on the surface of the battery pieces and performing lamination.

2. The production method according to claim 1, characterized by, In the first direction, the distance between the adhesive strips and the edges of the battery pieces is less than or equal to 5 mm.

3. The preparation method according to claim 1, characterized in that, In the first direction, the length of the adhesive strips near the edges of the battery pieces in the first direction is greater than the length of the adhesive strips away from the edges of the battery pieces in the first direction.

4. The method of claim 1, wherein, The ratio of the length of the adhesive strips in the first direction in the edge regions to the length of the adhesive strips in the first direction in the center region is greater than or equal to 5.

5. The method of any one of claims 1-4, wherein, The length of the adhesive strips in the first direction in the edge regions is 5-30 mm.

6. The method of claim 1, wherein, In the second direction, the length of the adhesive strips near the edges of the battery pieces in the second direction is greater than the length of the adhesive strips away from the edges of the battery pieces in the second direction.

7. The preparation method according to claim 1, characterized in that, In the first direction, the thickness of the adhesive strips near the edges of the battery pieces in the first direction is greater than the thickness of the adhesive strips away from the edges of the battery pieces in the second direction; in the second direction, the thickness of the adhesive strips near the edges of the battery pieces in the second direction is greater than the thickness of the adhesive strips away from the edges of the battery pieces in the second direction.

8. The production method according to claim 1 or 7, characterized by, In a direction perpendicular to the surface of the battery pieces, the thickness of the adhesive strips is 0.1-0.35 mm.

9. The method of claim 1, wherein, In the second direction, the width of the adhesive strips is greater than the width of the solder strips, and the adhesive strips cover the entire width of the solder strips in the second direction.

10. The method of claim 9, wherein, In the first direction, the width of the adhesive strips near the edges of the battery pieces in the first direction is greater than the width of the adhesive strips away from the edges of the battery pieces in the first direction; in the second direction, the width of the adhesive strips near the edges of the battery pieces in the second direction is greater than the width of the adhesive strips away from the edges of the battery pieces in the second direction.

11. The method of claim 1, wherein, The screen printing process for printing the adhesive strips comprises: providing a screen printing screen, the screen printing screen having a plurality of through holes arranged at intervals; Placing the screen printing glue mesh on the battery piece, so that the plurality of through holes correspond to the surface of the welding strip and the area of the surface of the battery piece to which the glue strip needs to be applied; Performing screen printing to set glue in the plurality of through holes; Curing the glue to obtain the glue strip.

12. The method of claim 11, wherein, The process method for curing the glue is UV curing method.

13. A photovoltaic module, characterized by, Comprise: A battery string comprising a plurality of battery pieces distributed along a first direction, the battery pieces comprising a center area and edge areas located on opposite sides of the center area along the first direction, adjacent battery pieces being electrically connected via a plurality of welding strips arranged at intervals along a second direction, the second direction being perpendicular to the first direction, the welding strip surface of the edge areas and the center area having a glue strip, the length of the glue strip in the edge areas along the first direction being greater than the length of the glue strip along the second direction, and the length of the glue strip in the center area along the first direction being less than the length of the glue strip in the edge areas along the first direction; An encapsulation adhesive film for covering the surface of the battery string; A cover plate for covering the surface of the encapsulation adhesive film away from the battery string.

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