Photovoltaic module

Abstract

The embodiment of the invention relates to the photovoltaic field, and provides a photovoltaic module, which comprises a battery string, the battery string comprises a plurality of battery pieces distributed along a first direction, each battery piece comprises a central area and edge areas located at two opposite sides of the central area along the first direction, and the adjacent battery pieces are connected through a plurality of welding strips arranged at intervals along a second direction, the second direction is perpendicular to the first direction, adhesive tapes are arranged on the surface of the solder strip in the edge area and the central area, and the length of the adhesive tape in the central area along the first direction is smaller than that of the adhesive tape in the edge area along the first direction; the packaging adhesive film is used for covering the surface of the battery string; and the cover plate is used for covering the surface, deviating from the battery string, of the packaging adhesive film. The stability of the photovoltaic module can be improved at least.

Description

Cross-references to related applications

[0001] This application is a divisional application of Chinese invention patent application filed on November 7, 2023, with application number 2023114746045 and invention title "Photovoltaic Module and Preparation Method Thereof". Technical Field

[0002] This disclosure relates to the photovoltaic field, and in particular to a photovoltaic module. Background Technology

[0003] The development of crystalline silicon photovoltaic cells has been hampered by production costs and power generation, which are the main factors restricting their further development. Silicon materials account for 60% of the production cost of crystalline silicon cells. 70% of the material cost, with silver paste required for the cell grid lines accounting for 20%. 30% of material costs. Therefore, the bold proposal of the grid-less technology by predecessors was also an urgent desire to reduce the manufacturing cost of crystalline silicon solar cells. Moreover, this technology also helps to increase the effective light-receiving area of ​​crystalline silicon solar cells and increase power generation.

[0004] However, welding the cell strings is a significant challenge in busbarless technology. Traditionally, to connect individual cells into a battery pack, flux-soaked solder ribbon is laid flat on the main grid surface of the cell, and then the ribbon is melted at high temperature to weld it to the cell. However, busbarless cells lack main grid lines, making traditional welding processes unsuitable. Current photovoltaic module manufacturing methods also suffer from poor stability. Summary of the Invention

[0005] This disclosure provides a photovoltaic module that at least helps to solve the problem of poor stability of photovoltaic modules.

[0006] According to some embodiments of this disclosure, one aspect of this disclosure provides a photovoltaic module, including: a battery string, the battery string including a plurality of battery cells distributed along a first direction and solder strips electrically connecting adjacent battery cells, the solder strips being arranged along a second direction, each battery cell including a central region and edge regions located on opposite sides of the central region along the first direction, the surface of the solder strips in the edge regions and the central region having adhesive strips, the length of the adhesive strips located in the central region being less than the length of the adhesive strips located in the edge regions along the first direction; an encapsulating film for covering the surface of the battery string; and a cover plate for covering the surface of the encapsulating film facing away from the battery string.

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

[0008] In some embodiments, the length of the adhesive strip along the first direction gradually increases from the central region of the battery cell to the edge regions on both sides.

[0009] In some embodiments, the lengths of some adjacent adhesive strips are equal along the first direction.

[0010] In some embodiments, along the first direction and in the same column, one or more of the adhesive strips near the edge of the battery cell have a first length in the first direction, and the remaining adhesive strips have a second length, wherein the first length is greater than the second length.

[0011] In some embodiments, along the first direction, the ratio of the length of the adhesive strip located in the edge region to the length of the adhesive strip located in the center region is greater than or equal to 5.

[0012] In some embodiments, along the second direction, the length of the adhesive strip near the edge of the battery cell along the first direction is greater than the length of the adhesive strip away from the edge of the battery cell along the first direction.

[0013] In some embodiments, adjacent portions of the adhesive strip along the second direction have the same length in the first direction.

[0014] In some embodiments, along the second direction and in the same row, one or more of the adhesive strips near the edge of the battery cell have a third length in the first direction, and the remaining adhesive strips have a fourth length in the first direction, wherein the third length is greater than the fourth length.

[0015] In some embodiments, the length of the adhesive strip located in the edge region along the first direction is greater than the length of the adhesive strip along the second direction.

[0016] In some embodiments, along the first direction, the thickness of the adhesive strip near the edge of the battery cell is greater than the thickness of the adhesive strip away from the edge of the battery cell; along the second direction, the thickness of the adhesive strip near the edge of the battery cell is greater than the thickness of the adhesive strip away from the edge of the battery cell.

[0017] In some embodiments, along the first direction and in the same column, the thickness of one or more adhesive strips near the edge of the battery cell is a first thickness, and the thickness of the remaining adhesive strips is a second thickness, wherein the first thickness is greater than the second thickness.

[0018] In some embodiments, along the second direction and in the same row, the thickness of one or more adhesive strips near the edge of the battery cell is a third thickness, and the thickness of the remaining adhesive strips is a fourth thickness, wherein the third thickness is greater than the fourth thickness.

[0019] In some embodiments, the width of the adhesive strip is greater than the width of the solder strip along the second direction.

[0020] In some embodiments, along the first direction, the width of the adhesive strip near the edge of the battery cell is greater than the width of the adhesive strip away from the edge of the battery cell; along the second direction, the width of the adhesive strip near the edge of the battery cell is greater than the width of the adhesive strip away from the edge of the battery cell.

[0021] In some embodiments, among the adhesive strips along the first direction and in the same column, the width of one or more adhesive strips near the edge of the battery cell is a first width, and the width of the remaining adhesive strips is a second width, wherein the first width is greater than the second width.

[0022] In some embodiments, among the adhesive strips along the second direction and in the same row, the width of one or more adhesive strips near the edge of the battery cell is a third width, and the width of the remaining adhesive strips is a fourth width, wherein the third width is greater than the fourth width.

[0023] The technical solutions provided in this disclosure have at least the following advantages: The photovoltaic module manufacturing method provided in this disclosure includes: In related technologies, the connection between the grid-less solar cell and the solder ribbon is generally achieved by applying adhesive dots to the area where the solder ribbon and the solar cell are connected, with the adhesive dots being evenly distributed across the entire solar cell. However, during actual use of the solar cell, there are alternating periods of hot and cold temperatures. 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 the areas where the edge areas and the central area connect with the solder ribbon, and the length of the adhesive strip in the edge areas, which are more prone to hot and cold cycle failure, is greater than the length of the adhesive strip in the central area. In this way, the edge areas, which are more prone to hot and cold cycle failure, can be specifically protected, reducing the probability of hot and cold cycle failure of the photovoltaic module, thereby improving the stability and reliability of the photovoltaic module manufactured by the photovoltaic module manufacturing method. Attached Figure Description

[0024] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the cell step in the method for manufacturing a photovoltaic module according to an embodiment of this disclosure; Figure 2 A schematic diagram of the welding process steps in a method for manufacturing a photovoltaic module according to an embodiment of this disclosure; Figure 3 A schematic diagram of the structure of a screen printing stencil provided in a method for preparing a photovoltaic module according to an embodiment of this disclosure; Figure 4 This is a schematic diagram of a printing adhesive strip used in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure. Figures 5 to 10 Various top view structural schematic diagrams of the printing adhesive strip step in the photovoltaic module manufacturing method provided in the embodiments of this disclosure; Figures 11 to 16 These are schematic side views of various structural details of the printing adhesive strip step in the photovoltaic module manufacturing method provided in this disclosure embodiment; Figures 17 to 22 Various top view structural schematic diagrams of the printing adhesive strip step in the photovoltaic module manufacturing method provided in the embodiments of this disclosure; Figure 23 This is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present disclosure; Figure 24 This is a top view of a solar cell in a photovoltaic module according to an embodiment of the present disclosure. Detailed Implementation

[0026] As can be seen from the background technology, the photovoltaic modules manufactured by the current photovoltaic module manufacturing methods have the problem of poor stability.

[0027] In related technologies, to ensure a relatively stable connection between the cell string and the solder ribbon in gridless solar cells, a dispensing welding process can be employed. Specifically, adhesive dots are applied to the connection area between the solder ribbon and the cell, with the dots evenly distributed across the entire cell. These adhesive dots assist in fixing the solder ribbon to the cell surface, thereby improving the stability of the connection between the solder ribbon and the cell, and consequently, the stability of the photovoltaic module.

[0028] However, in actual use, solar cells experience alternating periods of hot and cold temperatures. Solar modules manufactured using the aforementioned adhesive bonding process may experience thermal cycling failure due to these alternating temperature changes. In some areas, the adhesive bonding may fail to connect the solder strip to the solar cell. Therefore, the stability of solar modules manufactured using this method still needs improvement.

[0029] This disclosure provides a method for manufacturing a photovoltaic module. First, multiple solar cells distributed along a first direction are provided. Each solar cell includes a central region and edge regions located on opposite sides of the central region along the first direction. Next, welding is performed so that adjacent solar cells are electrically connected via multiple welding strips spaced apart along a second direction, perpendicular to the first direction. Adhesive strips are printed onto the surface of the welding strips on the solar cells using screen printing. Along the first direction, the length of the adhesive strips located in the edge regions is greater than the length of the adhesive strips located in the central region, and the adhesive strips in the edge regions are elongated along the direction of the welding strips, capable of covering a larger length of welding strip. Finally, an encapsulating film and a cover plate are laid on the surface of the solar cells and laminated to obtain the photovoltaic module. By providing adhesive strips in the edge regions of the solar cells that are longer than the length of the central region, and making the edge region adhesive strips elongated along the direction of the welding strips, the photovoltaic module can provide targeted protection for areas prone to thermal cycling, reducing the probability of thermal cycling failure and thus improving the stability and reliability of the photovoltaic module manufactured by this method. In addition, using screen printing to form adhesive strips can reduce costs, improve production efficiency, and further enhance the stability of photovoltaic modules.

[0030] To make the objectives, technical solutions, and advantages of this disclosure clearer, the various embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0031] refer to Figure 1A plurality of battery cells 100 are provided distributed along a first direction X. Each battery cell 100 includes a central region 101 and edge regions 102 located on opposite sides of the central region 101 along the first direction X.

[0032] In some embodiments, the solar cell 100 may be an emitter-and-back-passivated cell (PERC), a tube oxide-passivated contact cell (TOPCon), an intrinsic thin-film heterojunction cell (HJT), an interdigitated back contact cell (IBC), etc.

[0033] The edge regions 102 located on opposite sides of the central region 101 along the first direction X in the battery cell 100 are the areas of the battery cell 100 that are prone to thermal cycling failure during actual use. In some embodiments, the ratio of the length of the edge region 102 along the first direction X to the length of the central region 101 along the first direction X in the battery cell 100 can be 1:1 to 1:5. For example, the ratio of the length of the edge region 102 along the first direction X to the length of the central region 101 along the first direction X can be 1:1, 1:2, 1:3, 1:4, or 1:5, etc.

[0034] refer to Figure 2 A welding process is performed to electrically connect adjacent battery cells 100 via multiple welding strips 110 spaced apart along a second direction Y, which is perpendicular to the first direction X.

[0035] In some embodiments, the solar cell 100 has a plurality of fine grids (not shown) spaced apart along a first direction X. The fine grids are electrically connected to the solar cell 100 and extend along a second direction Y, i.e., the extension direction of the fine grids is perpendicular to the extension direction of the solder ribbons 110. During the welding process between the solar cell 100 and the plurality of solder ribbons 110, the welding point between the solder ribbons 110 and the solar cell 100 can be located at the contact point between the solder ribbons 100 and the fine grids, thereby enabling the solder ribbons 100 to be electrically connected to the fine grids, realizing the electrical connection between the plurality of solar cells 100 in the solar cell string.

[0036] However, welding makes it difficult to form a stable connection between the solder ribbon 110 and the solar cell 100. It is necessary to apply glue to the surface of the solder ribbon 110 and the solar cell 100 for further fixation in order to improve the stability of the manufactured photovoltaic module.

[0037] refer to Figures 3 to 22Using screen printing, adhesive strips 120 are printed on the surface of the solder strips 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.

[0038] Figure 3 This is a schematic diagram of the structure of a screen printing stencil provided in an embodiment of the present disclosure. Figure 4 This is a schematic diagram illustrating a step of applying adhesive strips in a photovoltaic module manufacturing method according to an embodiment of this disclosure. It should be noted that... Figure 3 This is a simplified schematic diagram of a screen printing stencil. In reality, a screen printing stencil is composed of many slanted and intersecting copper wires, and the printing area is not entirely hollowed out.

[0039] refer to Figures 3 to 4 In some embodiments, printing the adhesive strip 120 using a screen printing process may include: (Refer to...) Figure 3 A screen printing stencil 200 is provided, which has multiple through holes 210 arranged at intervals. The pattern of the through holes on the screen printing stencil corresponds to the pattern on which adhesive strips need to be applied to the battery cell.

[0040] After providing the screen printing stencil, the screen printing stencil 200 can be placed on the battery cell 100, so that the multiple through holes 210 correspond to the areas on the surface of the solder ribbon 110 and the surface of the battery cell 100 where the adhesive strip 120 needs to be applied, in order to perform the subsequent screen printing process. Screen printing is then performed, and the adhesive is placed within the multiple through holes 210. Finally, the adhesive 120 needs to be cured to obtain the adhesive strip 120.

[0041] It should be noted that, in some embodiments, after applying the adhesive strip 120 to one side of the battery cell 100 and curing the adhesive strip 120, the battery cell 100 needs to be flipped over, and the adhesive strip 120 needs to be applied to the other side of the battery cell 100 and cured. This completes the application process of the adhesive strip 120 in the entire battery string.

[0042] In some embodiments, the process for curing the adhesive can be a UV curing method. UV curing involves irradiating the adhesive with ultraviolet light to cure it into an adhesive strip 120. UV curing is highly efficient and can cure the adhesive in a short time. Furthermore, UV curing does not require increasing the surface temperature of the solar cell 100, thus preventing warping of the solar cell 100 and improving the yield of the manufactured photovoltaic modules.

[0043] Specifically, the curing time for adhesives using UV curing methods can range from 10 to 70 seconds. For example, UV curing times can be 10, 12, 15, 18, 20, 50, 70, 60, or 70 seconds. The light intensity for UV curing can be up to 900 MW / cm². 2 -1800MW / CM 2 For example, the light intensity for UV curing can be 900 MW / CM. 2 1000MW / CM 2 1100MW / CM 2 1200MW / CM 2 1500MW / CM 2 Or 1800MW / CM 2 If the UV curing process takes too long or the light intensity is too high, it will lead to reduced production efficiency and wasted production costs. If the UV curing process takes too short or the light intensity is too low, the adhesive may not fully cure to the required thickness, reducing the yield of photovoltaic modules. Therefore, the UV curing process time and light intensity need to be selected within an appropriate range. The ideal UV curing process time is 10-70 seconds, and the ideal light intensity is 900 MW / CM. 2 -1800MW / CM 2 This approach achieves both high production efficiency and low production costs, while ensuring that the adhesive is fully cured into adhesive strip 120, thus improving the yield of photovoltaic modules.

[0044] In other embodiments, the process for curing the adhesive can also be a thermosetting method. The thermosetting method involves heating the adhesive to cure it into adhesive strip 120, eliminating the need for additional curing equipment and saving on production costs.

[0045] Continue to refer to Figure 4In some embodiments, the distance between the adhesive strip 120 and the edge of the battery cell 100 along 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 battery cell 100 along the first direction X can be 0 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, etc. Since the edge of the battery cell 100 is an area more prone to thermal cycling failure, the closer the distance between the adhesive strip 120 and the edge of the battery cell 100 along the first direction X, the better the adhesive strip 120's effect in preventing thermal cycling 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 battery cell 100, the worse the adhesive strip 120's effect in preventing thermal cycling failure, and the weaker the fixing effect of the adhesive strip 120. Therefore, along the first direction X, the distance between the adhesive strip 120 and the edge of the battery cell 100 should be small. When the distance between the adhesive strip 120 and the edge of the battery cell 100 is less than or equal to 5mm, the adhesive strip 120 can effectively prevent thermal cycling failure, and its fixing effect is strong. Ideally, when the distance between the adhesive strip 120 and the battery cell 100 along the first direction X is 0, the adhesive strip 120 can best prevent thermal cycling failure.

[0046] It should be noted that the edge of the solar cell 100 along the first direction X is prone to failure due to thermal cycling, and the closer to the edge of the solar cell 100 along the first direction X, the higher the probability of thermal cycling failure. In this embodiment, the fixing strength of the solder ribbon 120 on the solar cell 100 in different areas along the first direction X can be controlled by controlling the length of the adhesive strip 120 along the first direction X. The longer the adhesive strip 120 along the first direction X, the larger the area covered by the adhesive strip 120, and the stronger the effect of the adhesive strip 120 in fixing the solder ribbon 110 to the solar cell 100. This is more conducive to avoiding thermal cycling failure and improving the stability of the photovoltaic module. The following will specifically describe the length of the adhesive strip 120 at different positions along the first direction X of the solar cell 100.

[0047] refer to Figure 5In some embodiments, along the first direction X, the length of the adhesive strip 120 near the edge of the solar cell 100 located in the first direction X can be greater than the length of the adhesive strip 120 away from the edge of the solar cell 100 located in the first direction X. It is understood that the length of the adhesive strip 120 along the first direction X can gradually increase from the center of the solar cell 100 to the two side edges. Correspondingly, along the first direction X, the closer to the edge of the solar cell 100, the longer the adhesive strip 120 is, the larger the area of ​​the solder ribbon covered by the adhesive strip 120, and the stronger the fixing effect of the adhesive strip 120 on the solder ribbon 110. This better prevents thermal cycling failure in the photovoltaic module, allowing the adhesive strip 120 to provide different levels of fixing protection for areas with different risks of thermal cycling failure in the photovoltaic module, further reducing the risk of thermal cycling failure and improving the stability of the photovoltaic module.

[0048] refer to Figure 6 In some embodiments, along the first direction X, the length of the adhesive strip 120 near the edge of the solar cell 100 located in the first direction X can also be equal to the length of the adhesive strip 120 away from the edge of the solar cell 100 located in the first direction X. That is, the lengths of adjacent adhesive strips 120 along the first direction X can be the same. Compared to the scheme where the length of the adhesive strip 120 is longer closer to the edge of the solar cell 100 along the first direction X, adjacent adhesive strips 120 having the same length means that the failure risk of different areas of the solar cell 100 in the first direction X can be gradient-divided. This allows for the provision of fixed connections of different strengths for areas with different failure risks to reduce the risk of failure of photovoltaic modules during thermal cycling, while minimizing the area of ​​the solar cell covered by the adhesive strip, increasing the effective light utilization area of ​​the solar cell surface, and improving the performance of the solar cell. This not only provides fixed protection of different strengths for different areas of the solar cell 100, but also reduces production difficulty and process complexity to a certain extent.

[0049] refer to Figure 7In some embodiments, along the first direction X, one or more adhesive strips 120 near the edge of the solar cell 100 can have a first length, while other adhesive strips in the middle can have a second length, with the first length being greater than the second length. Specifically, one or two adhesive strips 120 near the edge of the solar cell 100 in the first direction X can be set to have the same length, while the remaining adhesive strips 120 have a different length, with the edge adhesive strips 120 having a larger length. This further reduces the manufacturing difficulty and complexity, increases the effective light utilization area of ​​the solar cell surface, and improves the performance of the solar cell, while still providing varying degrees of protection to different areas of the solar cell 100.

[0050] In some embodiments, the ratio of the length of the adhesive strip 120 located in the edge region 102 along the first direction X to the length of the adhesive strip 120 located in the center region 101 along the first direction X can be greater than or equal to 5. For example, the ratio of the length of the adhesive strip 120 located in the edge region 102 along the first direction X to the length of the adhesive strip 120 located in the center region 101 along the first direction X can be 5, 6, 8, 10, 30, 50, 100, etc. In actual use of photovoltaic modules, the solder strips 110 located at the edges are most prone to thermal cycling failure. Although the solder strips 110 located in the center also have a certain possibility of thermal cycling failure, the probability of thermal cycling failure in the central area 101 is much lower than that in the edge area 102. Setting the adhesive strip in the edge area 102 to have a larger length can effectively protect the connection between the solder strips 110 and the solar cells 100, thereby improving the stability of the photovoltaic module. Setting the adhesive strip 120 in the central area 101 to be relatively shorter can reduce the amount of adhesive used and also reduce the area of ​​the solar cells 100 covered by the adhesive strip 120, so that a larger area of ​​the solar cells 100 can serve as an effective light absorption surface, thereby improving light utilization and enhancing the performance of the photovoltaic module. Therefore, when the ratio of the length of the adhesive strip 120 located in the edge region 102 along the first direction X to the length of the adhesive strip 120 located in the center region 101 along the first direction X is greater than or equal to 5, it can not only protect the connection between the solder strip 110 and the cell 100 to a large extent and improve the stability of the photovoltaic module, but also enable the photovoltaic module to have better performance.

[0051] In some embodiments, the length of the adhesive strip 120 located in the edge region 102 along the first direction X can be 5mm-30mm. For example, the length of the adhesive strip 120 located in the edge region 102 along the first direction X can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc. If the length of the adhesive strip 120 located in the edge region 102 along the first direction X is too small, the fixing strength between the welding strip 110 in the edge region 102 and the solar cell 100 may be insufficient, which may still lead to the problem of thermal cycling failure at the edge of the solar cell 100; if the length of the adhesive strip 120 located in the edge region 102 along the first direction X is too large, the adhesive strip 120 will cover a large area of ​​the surface of the solar cell 100, thereby reducing the area of ​​the effective light absorption surface in the solar cell 100, affecting the light utilization rate, and affecting the performance of the photovoltaic module. Therefore, the length of the adhesive strip 120 located in the edge region 102 along the first direction X needs to be selected within a suitable range. When the length of the adhesive strip 120 located in the edge region 102 along the first direction X is 5mm-30mm, it can effectively solve the problem of thermal cycling failure at the edge of the solar cell 100, and also make the solar cell 100 have a larger effective light absorption surface, resulting in a higher light utilization rate of the solar cell 100 and stronger performance of the photovoltaic module.

[0052] It should be noted that the edge of the solar cell 100 along the second direction Y is also prone to failure due to thermal cycling. The closer to the edge of the solar cell 100 along the second direction Y, the higher the probability of thermal cycling failure. That is, the closer the solder strip is to the edge of the solar cell 100 along the second direction Y, the more likely it is to fail due to thermal cycling. In this embodiment, the fixing strength of the solder strip 120 on the solar cell 100 in different areas along the second direction Y can be controlled by controlling the length of the adhesive strip 120 along the first direction X. The longer the adhesive strip 120 along the first direction X, the larger the area covered by the adhesive strip 120, and the stronger the effect of the adhesive strip 120 in fixing the solder strip 110 to the solar cell 100. This is more conducive to avoiding thermal cycling failure and improving the stability of the photovoltaic module. The following will specifically describe the length of the adhesive strip 120 at different positions on the solar cell 100 along the second direction Y in the first direction X.

[0053] refer to Figure 8In some embodiments, along the second direction Y, the length of the adhesive strip 120 near the edge of the solar cell 100 located in the second direction Y along the first direction X can be greater than the length of the adhesive strip 120 away from the edge of the solar cell 100 located in the second direction Y along the first direction X. It is understood that along the second direction Y, the length of the adhesive strip 120 along the first direction X can gradually increase from the center of the solar cell 100 to both side edges. Correspondingly, along the second direction Y, the closer to the edge of the solar cell 100, the longer the adhesive strip 120, the larger the area of ​​the solder ribbon 110 covered by the adhesive strip 120, and the stronger the fixing effect of the adhesive strip 120 on the solder ribbon 100. This better prevents thermal cycling failure in the photovoltaic module, allowing the adhesive strip 120 to provide different strengths of fixing protection for areas with different thermal cycling failure risks in the photovoltaic module, further reducing the risk of thermal cycling failure in the photovoltaic module and improving the stability of the photovoltaic module.

[0054] refer to Figure 9 In some embodiments, along the second direction Y, the length of the adhesive strip 120 near the upper edge of the solar cell 100 in the second direction Y along the first direction X can also be equal to the length of the adhesive strip 120 away from the upper edge of the solar cell 100 in the second direction Y along the first direction X. That is, along the second direction Y, the lengths of adjacent adhesive strips 120 in the first direction X can be the same. Compared to the scheme where the adhesive strip 120 is longer closer to the edge of the solar cell 100 along the second direction Y, adjacent adhesive strips 120 having the same length means that the failure risk of different areas of the solar cell 100 in the second direction Y can be gradient-divided. This allows for the provision of fixed connections of different strengths for areas with different failure risks to reduce the risk of failure of photovoltaic modules during thermal cycling, while minimizing the area of ​​the solar cell covered by the adhesive strip, increasing the effective light utilization area of ​​the solar cell surface, and improving the performance of the solar cell. This not only provides fixed protection of different strengths for different areas of the solar cell 100, but also reduces production difficulty and process complexity to a certain extent.

[0055] refer to Figure 10In some embodiments, along the second direction Y, the length of one or more adhesive strips 120 near the edge of the solar cell in the first direction X can be a third length, and the length of other adhesive strips 120 located in the middle in the first direction X can be a fourth length, where the third length is greater than the fourth length. Specifically, one or two adhesive strips 120 near the edge of the solar cell 100 in the second direction Y can be set to have the same length, while the remaining adhesive strips 120 have a different length, with the edge adhesive strips 120 having a larger length. In this way, based on the above-mentioned scheme of making adjacent adhesive strips 120 in the second direction Y have the same length, the process difficulty and complexity can be further reduced, the effective light utilization area of ​​the solar cell surface can be further increased, and the performance of the solar cell can be further improved, while still providing a certain degree of protection for different areas of the solar cell.

[0056] It should be noted that the edges of the solar cell 100 along the first direction X and along the second direction Y are prone to failure due to thermal cycling, and the closer to the edge of the solar cell 100 along the first direction X or the second direction Y, the higher the probability of thermal cycling failure. In this embodiment, the fixing strength of the solder ribbon 110 on the solar cell 100 in different areas along the first direction X and along the second direction Y can also be controlled by controlling the thickness of the adhesive strip 120. The thicker the adhesive strip 120, the stronger its effect in fixing the solder ribbon 110, which is more conducive to avoiding thermal cycling failure and improving the stability of the photovoltaic module. The following will specifically describe the thickness of the adhesive strip 120 at different positions along the first direction X and along the second direction Y.

[0057] refer to Figures 11 to 12 In some embodiments, Figure 11 This is a side view of a structure in the second direction of one step of applying adhesive strips in the fabrication method of a photovoltaic module provided in this disclosure. (Reference) Figure 11 Along the first direction X, the thickness of the adhesive strip 120 near the edge of the solar cell 100 in the first direction X can be greater than the thickness of the adhesive strip 120 away from the edge of the solar cell 100 in the second direction Y. It can be understood that along the first direction X, the thickness of the adhesive strip 120 can gradually increase from the center of the solar cell 100 to the two side edges. Correspondingly, along the first direction X, the closer to the edge of the solar cell 100, the thicker the adhesive strip 120, and the stronger the fixing effect of the adhesive strip 120 on the welding ribbon 100. This better prevents thermal cycling failure in the photovoltaic module, allowing the adhesive strip 120 to provide different strengths of fixing protection for areas with different risks of thermal cycling failure in the photovoltaic module, further reducing the risk of thermal cycling failure and improving the stability of the photovoltaic module.

[0058] Figure 12This is a side view of a structure in the adhesive strip application step of a photovoltaic module fabrication method provided in this disclosure, along a first direction. (Reference) Figure 12 Along the second direction Y, the thickness of the adhesive strip 120 near the edge of the solar cell 100 in the second direction Y can be greater than the thickness of the adhesive strip 120 away from the edge of the solar cell 100 in the second direction Y. It can be understood that along the second direction Y, the thickness of the adhesive strip 120 can gradually increase from the center of the solar cell 100 to both side edges. Correspondingly, along the second direction Y, the closer to the edge of the solar cell 100, the thicker the adhesive strip 120, and the stronger the fixing effect of the adhesive strip 120 on the solder ribbon 100. This better prevents thermal cycling failure in the photovoltaic module, allowing the adhesive strip 120 to provide different levels of fixing protection for areas with different risks of thermal cycling failure in the photovoltaic module, further reducing the risk of thermal cycling failure and improving the stability of the photovoltaic module.

[0059] It should be noted that, Figure 12 The shape of the solder strip 110 shown in the following side view structural schematic diagrams along the first direction is rectangular. In some embodiments, the shape of the solder strip may also be circular or triangular (not shown in the figures). The shape of the solder strip refers to the cross-sectional shape of the solder strip when viewed from the side along the first direction X.

[0060] refer to Figures 13 to 14 In some embodiments, Figure 13 This is a side view of a structure in the second direction of one step of applying adhesive strips in the fabrication method of a photovoltaic module provided in this disclosure. (Reference) Figure 13 Along the first direction X, the thickness of the adhesive strip 120 near the upper edge of the solar cell 100 in the first direction X can also be equal to the thickness of the adhesive strip 120 away from the upper edge of the solar cell 100 in the first direction X. That is, the thickness of adjacent adhesive strips 120 can be the same along the first direction X. Compared with the scheme where the thickness of the adhesive strip 120 increases as it approaches the edge of the solar cell 100 along the first direction X, the fact that adjacent adhesive strips 120 have the same thickness means that the failure risk of different areas of the solar cell 100 in the first direction X can be graded. This allows for different strengths of fixed connections to be provided for areas with different failure risks to reduce the risk of failure during thermal cycling of the photovoltaic module, while minimizing the thickness of the adhesive strip in the photovoltaic module. This leaves more thickness space for the encapsulation film, improving the reliability of the photovoltaic module. It can provide different strengths of fixed protection for different areas of the solar cell 100 and can also reduce production difficulty and process complexity to a certain extent.

[0061] Figure 14This is a side view of a structure in the adhesive strip application step of a photovoltaic module fabrication method provided in this disclosure, along a first direction. (Reference) Figure 14 Along the second direction Y, the thickness of the adhesive strip 120 near the upper edge of the solar cell 100 in the second direction Y can be equal to the thickness of the adhesive strip 120 away from the upper edge of the solar cell 100 in the second direction Y. That is, the thickness of adjacent adhesive strips 120 can be the same along the second direction Y. Compared to the scheme where the thickness of the adhesive strip 120 increases closer to the edge of the solar cell 100 along the second direction Y, the fact that adjacent adhesive strips 120 have the same thickness means that the failure risk of different areas of the solar cell 100 in the second direction Y can be graded. This allows for different strengths of fixed connections to be provided for areas with different failure risks to reduce the risk of failure of the photovoltaic module during thermal cycling, while minimizing the thickness of the adhesive strip in the photovoltaic module. This leaves more thickness space for the encapsulation film, improving the reliability of the photovoltaic module. It can provide different strengths of fixed protection for different areas of the solar cell 100, and can also reduce production difficulty and process complexity to a certain extent.

[0062] refer to Figures 15 to 16 In some embodiments, Figure 15 This is a side view of a structure in the second direction of one step of applying adhesive strips in the fabrication method of a photovoltaic module provided in this disclosure. (Reference) Figure 15 Along the first direction X, the thickness of one or more adhesive strips 120 near the edge of the solar cell 100 can be a first thickness, and the thickness of other adhesive strips 120 located in the middle can be a second thickness, with the first thickness being greater than the second thickness. Specifically, one or two adhesive strips 120 near the edge of the solar cell 100 in the first direction X can be set to have the same thickness, while the remaining adhesive strips 120 have a different thickness, with the edge adhesive strips 120 being thicker. In this way, based on the above-mentioned scheme of making adjacent adhesive strips 120 in the second direction Y have the same thickness, the manufacturing difficulty and complexity can be further reduced, the reliability of the photovoltaic module can be further improved, and it can still play a certain role in providing different degrees of protection to different areas of the solar cell.

[0063] Figure 16 This is a side view of a structure in the adhesive strip application step of a photovoltaic module fabrication method provided in this disclosure, along a first direction. (Reference) Figure 16Along the second direction Y, the thickness of one or more adhesive strips 120 near the edge of the solar cell can be a third thickness, and the thickness of other adhesive strips 120 located in the middle can be a fourth thickness, with the third thickness being greater than the fourth thickness. Specifically, one or two adhesive strips 120 near the edge of the solar cell 100 in the second direction Y can be set to have the same thickness, while the remaining adhesive strips 120 have a different thickness, with the edge adhesive strips 120 being thicker. In this way, based on the above-mentioned scheme of making adjacent adhesive strips 120 in the second direction Y have the same thickness, the manufacturing process difficulty and complexity can be further reduced, the reliability of the photovoltaic module can be further improved, and it can still play a certain role in providing different degrees of protection to different areas of the solar cell.

[0064] It should be noted that when applying adhesive strips 120 of different thicknesses to the surfaces of the solar cell 100 and the solder ribbon 110 using screen printing, screen printing stencils of different thicknesses can be selected according to the thickness of the adhesive strip 120. Multiple screen printing stencils of different thicknesses can be placed on the solar cell 100 in sequence, and the screen printing process can be repeated multiple times. Ultimately, a photovoltaic module with adhesive strips 120 of different thicknesses in different areas of the solar cell 100 can be obtained.

[0065] in addition, Figures 11 to 16 The difference in thickness between different solder strips 110 shown does not represent the difference in thickness between different solder strips 110 in the actual product, but only indicates the relative relationship of the thickness of solder strips 110 at different positions.

[0066] In some embodiments, the thickness of the adhesive strip 120 in the direction perpendicular to the surface of the solar cell 100 can be 0.1mm-0.35mm. For example, the thickness of the adhesive strip 120 in the direction perpendicular to the surface of the solar cell 100 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 encroach on the space of the encapsulating film 300 in the middle of the photovoltaic module, making the thickness of the encapsulating film 300 in the area corresponding to the adhesive strip 120 too small, which will lead to a decrease in 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 ribbon 110 and the solar cell 100, affecting the stability of the photovoltaic module and making it difficult to play a good role in preventing thermal cycling 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 solar cell 100. When the thickness of the adhesive strip 120 is 0.1mm-0.35mm, it can ensure the high reliability of the photovoltaic module and enable the adhesive strip 120 to play a better role in preventing failure due to thermal cycling, thereby improving the stability of the photovoltaic module.

[0067] It should be noted that the edges of the solar cell 100 along the first direction X and along the second direction Y are prone to failure due to thermal cycling, and the closer to the edge of the solar cell 100 along the first direction X or the second direction Y, the higher the probability of thermal cycling failure. This embodiment can also control the fixing strength of the solder ribbon 110 on different regions of the solar cell 100 along the first direction X and along the second direction Y by controlling the width of the adhesive strip 120 along the second direction Y. The wider the adhesive strip 120, the stronger its effect in fixing the solder ribbon 110, which is more conducive to avoiding thermal cycling failure and improving the stability of the photovoltaic module. The following will specifically describe the width of the adhesive strip 120 along the second direction Y at different positions on the solar cell along the first direction X and along the second direction Y.

[0068] refer to Figure 17 In some embodiments, the width of the adhesive strip 120 along the second direction Y can be greater than the width of the solder ribbon 110, and the adhesive strip 120 covers the entire width of the solder ribbon 110 along the second direction Y. That is, the adhesive strip 120 can cover the entire width of the solder ribbon 110 along the second direction Y, and the adhesive strip 120 can cover a portion of the battery cell 100 adjacent to the solder ribbon 110 on both sides of the second direction Y. In this way, the adhesive strip 120 can play a better role in fixing this portion of the solder ribbon 110, so that the solder ribbon 110 is tightly bonded to the battery cell 100, effectively avoiding failure due to thermal cycling.

[0069] refer to Figures 17 to 18 In some embodiments, reference is made to Figure 17 Along the first direction X, the width of the adhesive strip 120 near the edge of the solar cell 100 in the first direction X can be greater than the width of the adhesive strip 120 away from the edge of the solar cell 100 in the first direction X. Along the first direction X, the closer to the edge of the solar cell 100, the wider the adhesive strip 120, resulting in a stronger fixing effect of the adhesive strip 120 on the solder ribbon 100, and better preventing thermal cycling failure in the photovoltaic module. (Reference) Figure 18Along the second direction Y, the width of the adhesive strip 120 near the edge of the solar cell 100 in the second direction Y is greater than the width of the adhesive strip 120 away from the edge of the solar cell 100 in the second direction Y. Along the second direction Y, the closer to the edge of the solar cell 100, the wider the adhesive strip 120, resulting in a stronger fixing effect of the adhesive strip 120 on the solder ribbon 100, and better preventing thermal cycling failure in the photovoltaic module. The adhesive strips, with their gradually increasing width from the center of the solar cell 100 to the edge of the solar cell 100 along both the first direction X and the second direction Y, allow the adhesive strip 120 to provide different levels of fixing protection for areas in the photovoltaic module with different risks of thermal cycling failure, further reducing the risk of thermal cycling failure and improving the stability of the photovoltaic module.

[0070] refer to Figures 19 to 20 In some embodiments, reference is made to Figure 19 Along the first direction X, the width of the adhesive strip 120 near the upper edge of the battery cell 100 in the first direction X can also be equal to the width of the adhesive strip 120 away from the upper edge of the battery cell 100 in the first direction X. That is, along the first direction X, the width of adjacent adhesive strips 120 can be the same. (See reference) Figure 20 Along the second direction Y, the width of the adhesive strip 120 near the upper edge of the solar cell 100 in the second direction Y can also be equal to the width of the adhesive strip 120 away from the upper edge of the solar cell 100 in the second direction Y. That is, along the second direction Y, the width of adjacent adhesive strips 120 can be the same. Compared to the scheme where the width of the adhesive strip 120 is wider closer to the edge of the solar cell 100 along the first direction X and the second direction Y, the fact that adjacent adhesive strips 120 have the same width means that the failure risk of the solar cell 100 in different areas can be graded. This allows for the provision of fixed connections of different strengths for areas with different failure risks to reduce the risk of failure of photovoltaic modules during thermal cycling, while minimizing the area of ​​the solar cell covered by the adhesive strip, increasing the effective light utilization area of ​​the solar cell surface, and improving the performance of the solar cell. This approach not only provides fixed protection of different strengths for different areas of the solar cell 100, but also reduces production difficulty and process complexity to a certain extent.

[0071] refer to Figures 21 to 22 In some embodiments, reference is made to Figure 21 Along the first direction X, the width of one or more adhesive strips 120 near the edge of the battery cell 100 can be a first width, and the width of other adhesive strips 120 located in the middle can be a second width, where the first width is greater than the second width. Specifically, one or two adhesive strips 120 near the edge of the battery cell 100 in the first direction X can be set to the same width, while the remaining adhesive strips 120 have a different width, with the edge adhesive strips 120 being wider. (Reference) Figure 22Along the second direction Y, the width of one or more adhesive strips 120 near the edge of the solar cell can be a third width, and the width of other adhesive strips 120 located in the middle can be a fourth width, with the third width being greater than the fourth width. Specifically, one or two adhesive strips 120 near the edge of the solar cell 100 in the second direction Y can be set to have the same width, while the remaining adhesive strips 120 have a different width, with the edge adhesive strips 120 being wider. In this way, based on the above-mentioned scheme where adjacent adhesive strips 120 in the first direction X or the second direction Y have the same width, the manufacturing difficulty and complexity can be further reduced, the effective light utilization area of ​​the solar cell surface can be further increased, and the performance of the solar cell can be further improved, while still providing a certain degree of protection for different areas of the solar cell.

[0072] refer to Figure 23 An encapsulating film 300 and a cover plate 400 are laid on the surface of the battery cell 100 and then laminated. After lamination, the encapsulating film 300 can fill the gaps between adjacent cover plates 400 and the battery string.

[0073] The photovoltaic module manufacturing method provided in this disclosure first involves providing multiple solar cells distributed along a first direction. Each solar cell includes a central region and edge regions on opposite sides of the central region along the first direction. Welding is then performed, such that adjacent solar cells are electrically connected via multiple solder strips spaced apart along a second direction, perpendicular to the first direction. Adhesive strips are screen-printed onto the solder strips, with the length of the adhesive strips in the edge regions being greater along the first direction than along the second direction, and the length of the adhesive strips in the edge regions being greater than the length of the adhesive strips in the central region. Finally, an encapsulating film and a cover plate are formed, and the photovoltaic module is laminated. This targeted protection of areas prone to thermal cycling failure improves the stability and reliability of the photovoltaic modules manufactured by this method. Furthermore, the screen printing process can reduce costs, increase production efficiency, and further enhance the stability of the photovoltaic modules.

[0074] Accordingly, another embodiment of this disclosure also provides a photovoltaic module, which is prepared by the method of preparing the photovoltaic module in the above embodiments. The photovoltaic module provided in another embodiment of this disclosure will be described in detail below with reference to the accompanying drawings. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions of the foregoing embodiments; detailed descriptions will not be repeated below.

[0075] refer to Figures 23 to 24The photovoltaic module includes: a battery string, which includes a plurality of battery cells 100 distributed along a first direction X. Each battery cell 100 includes a central region 101 and edge regions 102 located on opposite sides of the central region 101 along the first direction X. Adjacent battery cells 100 are electrically connected via a plurality of solder strips 110 spaced apart along a second direction Y, which is perpendicular to the first direction X. The solder strips 110 on the surface of the edge regions 102 and the central region 101 have adhesive strips. The length of the adhesive strip 120 located in the edge region 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 located in the central region 101 along the first direction X is less than the length of the adhesive strip 120 located in the edge region 102 along the first direction X; an encapsulating film 300 for covering the surface of the battery string; and a cover plate 400 for covering the surface of the encapsulating film 300 facing away from the battery string.

[0076] In some embodiments, the battery cells 100 in the battery string can be emitter and back passivated cells (PERC), tube oxide passivated contact cells (TOPCon), intrinsic thin-film heterojunction cells (HJT), interdigitated back contact cells (IBC), etc.

[0077] The encapsulating film 300 is used to bond the battery string to the cover plate 400. In some embodiments, the material of the encapsulating film 300 may include EVA, POE, PVB, etc. The encapsulating film 140 can protect the battery string, prevent the external environment from affecting the performance of the battery string 130, and has a certain adhesive strength.

[0078] In some embodiments, the cover plate 400 can be made of glass. Glass has low water permeability, and using a glass cover plate 400 can effectively block moisture from the external environment from entering the photovoltaic module through the cover plate 400, thereby reducing the corrosion of the cell string by moisture and the hydrolysis of the encapsulating film 300 by moisture, which can improve the service life of the photovoltaic module to a certain extent.

[0079] In other embodiments, the cover plate 400 may also be made of organic polymer materials.

[0080] The photovoltaic module provided in this disclosure includes a battery string, an encapsulating film covering the surface of the battery string, and a cover plate covering the encapsulating film facing away from the surface of the battery string. The battery string includes multiple battery cells arranged along a first direction. Each battery cell includes a central region and edge regions located on opposite sides of the central region along the first direction. Adjacent battery cells are connected by multiple solder strips, which are spaced apart along a second direction perpendicular to the first direction. Both the edge regions and the central region have adhesive strips on their solder strip surfaces. The length of the adhesive strip in the edge regions along the first direction is greater than its length along the second direction; that is, the edge region adhesive strip is strip-shaped along the solder strip extension direction, and its length is greater than that of the central region adhesive strip. Thus, the adhesive strip in the edge regions can provide targeted protection for areas prone to thermal cycling failure, improving the stability and reliability of the photovoltaic module manufactured by this method.

[0081] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make their own modifications and alterations without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A photovoltaic module, characterized in that, include: A battery string, the battery string including a plurality of battery cells distributed along a first direction and solder strips electrically connecting adjacent battery cells, the solder strips being arranged along a second direction, the battery cells including a central region and edge regions located on opposite sides of the central region along the first direction, the surface of the solder strips in the edge regions and the central region having adhesive strips, the length of the adhesive strips located in the central region being less than the length of the adhesive strips located in the edge regions along the first direction; An encapsulating film is used to cover the surface of the battery string; A cover plate is used to cover the surface of the encapsulating film that faces away from the battery string.

2. The photovoltaic module according to claim 1, characterized in that, Along the first direction, the length of the adhesive strip near the edge of the battery cell is greater than the length of the adhesive strip away from the edge of the battery cell.

3. The photovoltaic module according to claim 2, characterized in that, The length of the adhesive strip along the first direction gradually increases from the center region of the battery cell to the edge regions on both sides.

4. The photovoltaic module according to claim 1, characterized in that, Along the first direction, some adjacent adhesive strips are of equal length.

5. The photovoltaic module according to claim 1, characterized in that, Along the first direction and in the same column, one or more of the adhesive strips near the edge of the battery cell have a first length in the first direction, and the remaining adhesive strips have a second length, wherein the first length is greater than the second length.

6. The photovoltaic module according to claim 1, characterized in that, Along the first direction, the ratio of the length of the adhesive strip located in the edge region to the length of the adhesive strip located in the center region is greater than or equal to 5.

7. The photovoltaic module according to claim 1, characterized in that, Along the second direction, the length of the adhesive strip near the edge of the battery cell along the first direction is greater than the length of the adhesive strip away from the edge of the battery cell along the first direction.

8. The photovoltaic module according to claim 1, characterized in that, The adjacent portions of the adhesive strip along the second direction have the same length in the first direction.

9. The photovoltaic module according to claim 1, characterized in that, Along the second direction and in the same row, one or more of the adhesive strips near the edge of the battery cell have a third length in the first direction, and the remaining adhesive strips have a fourth length in the first direction, wherein the third length is greater than the fourth length.

10. The photovoltaic module according to claim 1, characterized in that, The length of the adhesive strip located in the edge region along the first direction is greater than the length of the adhesive strip along the second direction.

11. The photovoltaic module according to claim 1, characterized in that, Along the first direction, the thickness of the adhesive strip near the edge of the battery cell is greater than the thickness of the adhesive strip away from the edge of the battery cell; along the second direction, the thickness of the adhesive strip near the edge of the battery cell is greater than the thickness of the adhesive strip away from the edge of the battery cell.

12. The photovoltaic module according to claim 1, characterized in that, Along the first direction and in the same column, the thickness of one or more adhesive strips near the edge of the battery cell is a first thickness, and the thickness of the remaining adhesive strips is a second thickness, wherein the first thickness is greater than the second thickness.

13. The photovoltaic module according to claim 1, characterized in that, Along the second direction and in the same row, the thickness of one or more adhesive strips near the edge of the battery cell is a third thickness, and the thickness of the remaining adhesive strips is a fourth thickness, wherein the third thickness is greater than the fourth thickness.

14. The photovoltaic module according to claim 1, characterized in that, Along the second direction, the width of the adhesive strip is greater than the width of the welding strip.

15. The photovoltaic module according to claim 14, characterized in that, Along the first direction, the width of the adhesive strip near the edge of the battery cell is greater than the width of the adhesive strip away from the edge of the battery cell; along the second direction, the width of the adhesive strip near the edge of the battery cell is greater than the width of the adhesive strip away from the edge of the battery cell.

16. The photovoltaic module according to claim 1, characterized in that, Along the first direction and in the same column, the width of one or more adhesive strips near the edge of the battery cell is a first width, and the width of the remaining adhesive strips is a second width, wherein the first width is greater than the second width.

17. The photovoltaic module according to claim 1, characterized in that, Along the second direction and in the same row, the width of one or more of the adhesive strips near the edge of the battery cell is a third width, and the width of the remaining adhesive strips is a fourth width, wherein the third width is greater than the fourth width.

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