Photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic, and discloses a photovoltaic module, which comprises battery pieces, a welding strip, a covering film and a connecting piece, the welding strip is connected with the adjacent battery pieces to form a battery string, the covering film covers at least part of the welding strip and the battery pieces to fix the welding strip on the battery pieces, and the connecting piece is connected with the adjacent battery strings to form a battery piece layer; wherein the welding strip, the covering film and the connecting piece are located on the same side of the battery piece, the connecting piece is directly connected with the battery piece so as to improve the stability and reliability of connection between the connecting piece and the battery piece, and the connecting piece is surrounded by the covering film in the first direction x and the second direction y, or the covering film and the connecting piece are adjacently arranged in the second direction y. According to the invention, the covering film is arranged on the connecting piece, so that the covering film plays a role in limiting the displacement of the connecting piece in the horizontal plane, the possibility of relative movement between the connecting piece and the battery piece is further reduced during subsequent lamination and / or lamination, the possibility of displacement between adjacent battery strings is reduced, and the product quality and the production yield of the photovoltaic module are improved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic technology, and particularly to a photovoltaic module. Background Art

[0002] In the process of manufacturing a photovoltaic module, a film laminating process is usually adopted to first fixedly connect the welding ribbon to the solar cell, and then the welding ribbon and the fine grid of the solar cell are alloyed and connected through a lamination process, so as to reduce the consumption of silver paste in the production process of the photovoltaic module while realizing the current conduction function of the solar cell, thereby reducing the production cost of the photovoltaic module.

[0003] Currently, in the process of laminating a photovoltaic module, in order to prevent adjacent cell strings from shifting, tapes are usually arranged between adjacent cell strings for positioning. However, due to the poor bonding effect between the film and the tape, there is still a risk of cell string shifting during lamination, thus affecting the production quality and production yield of the photovoltaic module. Summary of the Invention

[0004] In view of this, the present application provides a photovoltaic module to solve the technical problem that cell strings shift during lamination in the prior art.

[0005] The present application provides a photovoltaic module, which includes solar cells, welding ribbons, a film, and a connecting member. The welding ribbons connect adjacent solar cells to form cell strings, the film covers at least part of the welding ribbons and the solar cells, and the connecting member connects adjacent cell strings to form a layer of solar cells; wherein, along the thickness direction of the photovoltaic module, the welding ribbons, the film, and the connecting member are located on the same side of the solar cells, and the film surrounds the connecting member along the first direction x and the second direction y, or the film and the connecting member are adjacent to each other along the second direction y.

[0006] The beneficial effect of the present application is that by directly connecting the connecting member to the solar cell, the risk of the connecting member falling off or displacing can be avoided, and the stability and reliability of the connection between the connecting member and the solar cell can be improved. Thus, during the subsequent stacking and / or lamination process of adjacent solar cells distributed along the first direction x, the possibility of relative movement between the two can be reduced, and further the possibility of displacement between adjacent cell strings can be reduced, which is beneficial to improving the structural stability inside the layer of solar cells and the product quality and production yield of the photovoltaic module.

[0007] At the same time, in each solar cell, since the film can both surround the connecting member along the first direction x and the second direction y and be adjacent to the connecting member along the second direction y, the installation method between the connecting member and the solar cell has diversity. Thus, the connection relationship between adjacent solar cells distributed along the first direction x can be adjusted according to actual needs, and further there can be multiple connection methods in adjacent cell strings, which is beneficial to improving the assembly flexibility and better meeting the actual usage requirements.

[0008] In a possible implementation, along the second direction y, the distance between the film covering and the edge of the battery cell is L1. When 0.5 mm ≤ L1 ≤ 1.5 mm is satisfied, at least one end of the film covering along the first direction x is provided with a receiving groove for receiving a connecting member, so that the film covering surrounds the connecting member.

[0009] In a possible implementation, the volume of the receiving groove is V1, the volume of the connecting member located in the receiving groove is V2, and V1 and V2 satisfy 0.4 ≤ V2 / V1 ≤ 0.8.

[0010] In a possible implementation, along the first direction x and the second direction y, the length of the receiving groove is a, and a satisfies 10 mm ≤ a ≤ 15 mm, and the width of the receiving groove is b, and b satisfies 3 mm ≤ b ≤ 8 mm.

[0011] In a possible implementation, along the first direction x, the distance between the receiving groove and the welding tape is L3, and L3 satisfies 0.8 mm ≤ L3 ≤ 3 mm.

[0012] In a possible implementation, along the first direction x, at least one end of the film covering is provided with a plurality of receiving grooves, and the plurality of receiving grooves are spaced apart along the second direction y, and the distance between adjacent receiving grooves is L4, and L4 satisfies 20 mm ≤ L4 ≤ 50 mm.

[0013] In a possible implementation, along the first direction x, receiving grooves are provided at both ends of the film covering, and the projections of the receiving grooves at both ends along the first direction x are one of being offset, overlapping, or partially overlapping.

[0014] In a possible implementation, along the second direction y, the distance between the film covering and the edge of the battery cell is L2. When 1 mm ≤ L2 ≤ 2.5 mm is satisfied, the connecting member is located on at least one side of the film covering facing the edge of the battery cell, so that the film covering and the connecting member are adjacent to each other.

[0015] In a possible implementation, along the first direction x and the second direction y, the distance between the connecting member and the film covering is L5, and L5 satisfies 3 mm ≤ L5 ≤ 6 mm, and the distance between the connecting member and the welding tape is L6, and L6 satisfies 2 mm ≤ L6 ≤ 5 mm.

[0016] In a possible implementation, the material of the film covering is EVA or POE, and the material of the connecting member is epoxy resin, polyurethane, acrylate, or epoxy acrylate.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of the battery cell provided by the present application in one embodiment; Figure 2 It is a schematic structural diagram of the film coating provided by the present application in the first embodiment; Figure 3 It is a schematic structural diagram of the film coating provided by the present application in the second embodiment; Figure 4 It is a schematic structural diagram of the film coating provided by the present application in the third embodiment; Figure 5 It is a schematic structural diagram of the battery cell provided by the present application in another embodiment; Figure 6 It is a schematic structural diagram of the film coating provided by the present application in the fourth embodiment.

[0020] Explanation of reference numerals: 1 - Battery cell; 2 - Welding tape; 3 - Film coating; 31 - Accommodating groove; 4 - Connecting piece.

[0021] The drawings here are incorporated into the description and form a part of this description, showing embodiments in line with the present application and used together with the description to explain the principles of the present application. Detailed implementation manners

[0022] To better understand the technical solutions of the present application, the following will describe the embodiments of the present application in detail with reference to the drawings.

[0023] It should be clear that the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0024] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms of "a", "the", and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0026] An embodiment of the present application provides a photovoltaic module, as Figure 1 and Figure 5 shown, the photovoltaic module includes a cell 1, a solder ribbon 2, a film 3, and a connector 4. The solder ribbon 2 connects adjacent cells 1 to form a cell string, the film 3 covers at least part of the solder ribbon 2 and the cells 1, and the connector 4 connects adjacent cell strings to form a cell layer.

[0027] Wherein, along the thickness direction of the photovoltaic module, the solder ribbon 2, the film 3, and the connector 4 are located on the same side of the cell 1, and the film 3 surrounds the connector 4 along the first direction x and the second direction y, or the film 3 is adjacent to the connector 4 along the second direction y.

[0028] In the embodiment of the present application, the length direction of the photovoltaic module is defined as the first direction x, and the width direction of the photovoltaic module is defined as the second direction y.

[0029] Along the thickness direction of the photovoltaic module, the solder ribbon 2 and the connector 4 are disposed on the surface of the same side of the cell 1, the film 3 is located on the side of the solder ribbon 2 facing away from the cell 1, and covers the solder ribbon 2 to fix it on the surface of the cell 1, so as to realize the fixed connection between the solder ribbon 2 and the cell 1 only by covering the solder ribbon 2 with the film 3, thereby being beneficial to ensuring the stability and reliability of the connection between the solder ribbon 2 and the cell 1 while reducing the production cost of the photovoltaic module.

[0030] Wherein, the solder ribbons 2 can be distributed at intervals along the first direction x and extend along the second direction y, so that adjacent cells 1 distributed along the second direction y are connected by the solder ribbons 2 to form a cell string, the connectors 4 can be distributed along the first direction x on at least one side of the solder ribbons 2, and one end of the connector 4 is connected to the cell 1, and the other end of the connector 4 is connected to the cell 1 in the adjacent cell string, so that adjacent cell strings distributed along the first direction x are connected by the connectors 4 to form a cell layer.

[0031] Therefore, by directly connecting the connector 4 with the cell 1, the stability and reliability of the connection between the two can be improved, and the possibility of the connector 4 and the cell 1 detaching from each other can be reduced. Thus, during the subsequent lamination and / or pressing process, the possibility of misalignment or offset between adjacent cells 1 or cell strings can be reduced, which is beneficial to improving the structural stability inside the cell layer, and further beneficial to improving the production yield of the photovoltaic module, and more in line with the actual production requirements.

[0032] Optionally, the film 3 can surround the connecting member 4 along the first direction x and the second direction y, so as to limit the movement of the connecting member 4 in this horizontal plane through the film 3, and avoid the possibility that the adjacent solar cells 1 distributed along the first direction x are disconnected or relatively moved during subsequent lamination and / or pressing processes due to the movement of the connecting member 4 relative to the solar cell 1, thereby being beneficial to further improving the stability and reliability of the connection between the adjacent solar cells 1 distributed along the first direction x.

[0033] Meanwhile, when the film 3 surrounds the connecting member 4 along the first direction x and the second direction y, as Figure 1 shown, the connecting member 4 is located at the short side edge of the solar cell 1 along the first direction x and is located in the middle area of the short side edge along the second direction y, that is, the connecting member 4 is centered and aligned with the solar cell 1 along the second direction y. Through such a design method, the stress can be evenly dispersed during the process of the solar cell 1 being pressed, avoiding the risk of the solar cell 1 being invisibly cracked due to local stress concentration, being beneficial to improving the safety of the solar cell 1 in subsequent process steps, and thus being able to further improve the production yield of the photovoltaic module.

[0034] In addition, through the way of surrounding and centering the film 3, the connecting member 4 can be double-protected, which is beneficial to further reducing the possibility of the displacement of the connecting member 4 relative to the solar cell 1 and improving the structural stability of the solar cell layer.

[0035] Optionally, the film 3 can be arranged adjacent to the connecting member 4 along the second direction y, so as to limit the movement of the connecting member 4 along the first direction x through the solder strip 2 and limit the movement of the connecting member 4 along the second direction y through the film 3, and avoid the possibility that the adjacent solar cells 1 distributed along the first direction x are disconnected or relatively moved during subsequent lamination and / or pressing processes due to the movement of the connecting member 4 relative to the solar cell 1, thereby being beneficial to further improving the stability and reliability of the connection between the adjacent solar cells 1 distributed along the first direction x.

[0036] Meanwhile, when the film 3 is arranged adjacent to the connecting member 4 along the second direction y, as Figure 5 shown, the connecting member 4 is located at the short side edge of the solar cell 1 along the first direction x and is located in the corner area of the short side edge along the second direction y, that is, the connecting member 4 is upper-aligned and / or lower-aligned with the solar cell 1 along the second direction y. Through such a design method, there can be at least one connecting member 4 between the adjacent solar cells 1 distributed along the first direction x, so that during the process of the adjacent battery strings shifting, the offset amount of the relative displacement between the two can be reduced, and thus the impact on the overall photovoltaic module can be reduced.

[0037] In addition, by arranging the film covering 3 adjacent to the connecting member 4, the connecting member 4 can be distributed on both sides of the film covering 3 along the second direction y, so that the adjacent solar cells 1 distributed along the first direction x are connected by at least two connecting members 4. Even if one of the connecting members 4 breaks or falls off, the adjacent solar cells 1 distributed along the first direction x can still maintain the connection relationship through the other connecting member 4, further improving the stability and reliability of the connection between adjacent battery strings and reducing the possibility of the connecting member 4 affecting the connection effect of adjacent battery strings.

[0038] Therefore, in this embodiment, by directly connecting the connecting member 4 to the solar cell 1, the risk of the connecting member 4 falling off or displacing can be avoided, and the stability and reliability of the connection between the connecting member 4 and the solar cell 1 can be improved. Thus, during the subsequent stacking and / or lamination processes of the adjacent solar cells 1 distributed along the first direction x, the possibility of relative movement between them can be reduced, and further the possibility of displacement between adjacent battery strings can be reduced, which is beneficial to improving the structural stability within the solar cell layer and the product quality and production yield of the photovoltaic module. At the same time, in each solar cell 1, since the film covering 3 can surround the connecting member 4 along both the first direction x and the second direction y and can be arranged adjacent to the connecting member 4 along the second direction y, the installation method between the connecting member 4 and the solar cell 1 has diversity. Therefore, the connection relationship between the adjacent solar cells 1 distributed along the first direction x can be adjusted according to actual requirements, and thus there can be multiple connection methods in adjacent battery strings, which is beneficial to improving the assembly flexibility and better meeting the actual usage requirements.

[0039] In a specific embodiment, as Figure 1 shown, along the second direction y, the distance between the film covering 3 and the edge of the solar cell 1 is L1. When 0.5 mm ≤ L1 ≤ 1.5 mm is satisfied, at least one end of the film covering 3 along the first direction x is provided with a receiving groove 31 for receiving the connecting member 4 to enable the film covering 3 to surround the connecting member 4.

[0040] In the embodiment of the present application, the distance L1 between the film covering 3 and the edge of the solar cell 1 can specifically be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, etc.

[0041] When the distance between the film covering 3 and the edge of the solar cell 1 is too small (for example, L1 is less than 0.5 mm), the distance between the film covering 3 and the long edge of the solar cell 1 is too close. During subsequent lamination and / or pressing processes, stress concentration is likely to occur at the long edge of the solar cell 1, resulting in a risk of latent cracks in the solar cell 1, thereby affecting the working performance of the photovoltaic module. At the same time, the too-close distance between the film covering 3 and the long edge of the solar cell 1 will also increase the difficulty of placing the film covering 3 during the placement process, thereby affecting the assembly efficiency of the photovoltaic module.

[0042] When the distance between the film covering 3 and the edge of the solar cell 1 is too large (for example, L1 is greater than 1.5 mm), the distance between the film covering 3 and the long edge of the solar cell 1 is too far, resulting in a reduction in the contact area between the film covering 3, the solder strip 2 and the solar cell 1, and a decrease in the fixing effect of the film covering 3 on the solder strip 2. During subsequent lamination and / or pressing processes, the solder strip 2 is likely to have adverse phenomena such as displacement or warping relative to the solar cell 1, thereby affecting the working performance and production yield of the photovoltaic module.

[0043] When the distance between the film covering 3 and the edge of the solar cell 1 satisfies 0.5 mm ≤ L1 ≤ 1.5 mm, the distance between the film covering 3 and the long edge of the solar cell 1 is appropriate, so that there is a gap between the film covering 3 and the long edge of the solar cell 1, enabling the operator to smoothly place the film covering 3 and improving the overall assembly efficiency of the photovoltaic module. At the same time, this gap can also prevent the stress of the film covering 3 from acting on the long edge of the solar cell 1, reducing the possibility of latent cracks in the solar cell 1 during subsequent lamination and / or pressing processes, and improving the safety and reliability of the solar cell 1 during the processing. In addition, there is a large contact area between the film covering 3, the solder strip 2 and the solar cell 1, to improve the stability and reliability of the connection between the solder strip 2 and the solar cell 1, reducing the possibility of displacement or deformation of the solder strip 2 during subsequent lamination and / or pressing processes, thereby being able to avoid the risk of damage to the solder strip 2 in subsequent processes, being conducive to improving the safety and reliability of the solder strip 2, and further improving the production yield of the photovoltaic module.

[0044] In a possible implementation manner, along the second direction y, the film covering 3 can be centered with the solar cell 1, so that there are a first gap and a second gap respectively between the two ends of the film covering 3 along this direction and the two long edges of the solar cell 1, and the first gap is equal to the second gap.

[0045] In other implementation manners, along the second direction y, the film covering 3 can also be set to be biased towards any one long edge of the solar cell 1, so that the first gap is not equal to the second gap.

[0046] Therefore, when the distance between the film coating 3 and the edge of the battery cell 1 satisfies 0.5 mm ≤ L1 ≤ 1.5 mm, at least one end of the film coating 3 in the first direction x is provided with a receiving groove 31 for receiving the connecting member 4. The receiving groove 31 has an opening facing the battery cell 1 of the adjacent battery string, so that one end of the connecting member 4 is located in the receiving groove 31 of the battery cell 1, and the other end of the connecting member 4 is located in the receiving groove 31 of another battery cell 1, so as to realize the connection of the adjacent battery cells 1 distributed in the first direction x by the connecting member 4.

[0047] In addition, by providing the receiving groove 31, not only can the installation efficiency of the connecting member 4 be improved, but also the installation accuracy of the connecting member 4 can be improved, so that the film coating 3 can tightly wrap the connecting member 4 in the first direction x and the second direction y, so as to limit the movement of the connecting member 4 in the horizontal direction, reduce the possibility of displacement between the connecting member 4 and the battery cell 1, improve the stability and reliability of the connection between the adjacent battery cells 1 distributed in the first direction x, thereby improving the connection effect between the adjacent battery strings, and further improving the structural stability inside the battery cell layer.

[0048] In a possible implementation manner, along the first direction x and the second direction y, the shape of the receiving groove 31 can be rectangular, semi-circular or triangular. By such a design method, the receiving groove 31 has the characteristics of simple structure and easy processing, which is beneficial to reducing the processing difficulty of the film coating 3.

[0049] In a specific implementation manner, as Figure 1 shown, the volume of the receiving groove 31 is V1, the volume of the connecting member 4 located in the receiving groove 31 is V2, and V1 and V2 satisfy 0.4 ≤ V2 / V1 ≤ 0.8.

[0050] In the embodiment of the present application, the connecting member 4 can be a colloid, and the ratio V2 / V1 of the volume of the connecting member 4 in the receiving groove 31 to the volume of the receiving groove 31 can specifically be 0.4, 0.42, 0.44, 0.46, 0.48, 0.5, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76, 0.78, 0.8, etc.

[0051] When the ratio of the volume of the connecting member 4 in the receiving groove 31 to the volume of the receiving groove 31 is too small (for example, V2 / V1 is less than 0.4), the filling of the connecting member 4 in the receiving groove 31 is less, so that the bonding strength between the connecting member 4 and the battery cell 1 is low, and there is a risk of disconnection. Moreover, due to a large amount of remaining space in the receiving groove 31, the film coating 3 cannot effectively limit the connecting member 4, so that the connecting member 4 is likely to displace in the receiving groove 31 during the subsequent lamination and / or pressing process.

[0052] When the ratio of the volume of the connecting member 4 in the receiving groove 31 to the volume of the receiving groove 31 is too large (for example, V2 / V1 is greater than 0.8), the connecting member 4 is filled more in the receiving groove 31, making it easy for the connecting member 4 to overflow from the receiving groove 31 during subsequent stacking and / or laminating processes, resulting in waste of production materials. Moreover, when the volume of the excessive connecting member 4 changes, it is likely to cause a strong squeezing effect on the battery cell 1, leading to the risk of hidden cracks in the battery cell 1.

[0053] Therefore, when the ratio of the volume of the connecting member 4 in the receiving groove 31 to the volume of the receiving groove 31 satisfies 0.4 ≤ V2 / V1 ≤ 0.8, the connecting member 4 is moderately filled in the receiving groove 31, enabling the connecting member 4 to fill the remaining space in the receiving groove 31 during subsequent stacking and / or laminating processes, so that the receiving groove 31 can tightly surround the connecting member 4. Thus, while avoiding excessive squeezing of the battery cell 1 by the connecting member 4, the possibility of the connecting member 4 displacing in the horizontal plane can be reduced, which is beneficial to improving the bonding effect between the connecting member 4 and the battery cell 1, and enhancing the product quality and production yield of the photovoltaic module.

[0054] In a specific embodiment, as Figure 1 shown, along the second direction y, the length of the receiving groove 31 is a, and a satisfies 10 mm ≤ a ≤ 15 mm.

[0055] In the embodiment of the present application, the length a of the receiving groove 31 can specifically be 10 mm, 10.2 mm, 10.4 mm, 10.6 mm, 10.8 mm, 11 mm, 11.2 mm, 11.4 mm, 11.6 mm, 11.8 mm, 12 mm, 12.2 mm, 12.4 mm, 12.6 mm, 12.8 mm, 13 mm, 13.2 mm, 13.4 mm, 13.6 mm, 13.8 mm, 14 mm, 14.2 mm, 14.4 mm, 14.6 mm, 14.8 mm, 15 mm, etc.

[0056] When the length of the receiving groove 31 is too small (for example, a is less than 10 mm), the receiving groove 31 is too short, and the contact area between the connecting member 4 and the battery cell 1 is too small, resulting in a poor bonding effect between the two. During subsequent stacking and / or laminating processes, there is a risk of disconnection between the connecting member 4 and the battery cell 1.

[0057] When the length of the receiving groove 31 is too large (for example, a is greater than 15 mm), the receiving groove 31 is too long, and the contact area between the connecting member 4 and the battery cell 1 is too large, resulting in the connecting member 4 being heavier in volume. This not only increases the overall weight of the photovoltaic module but also causes waste of production materials, leading to an increase in production costs.

[0058] Therefore, when the length of the receiving groove 31 satisfies 10 mm ≤ a ≤ 15 mm, the size of the receiving groove 31 in the second direction y is appropriate, so that the contact area between the connecting member 4 and the battery cell 1 is appropriate, in order to ensure a good bonding effect between the connecting member 4 and the battery cell 1 while reducing the input of production materials, lowering the production cost of the photovoltaic module, thus meeting the purpose of lightweight design of the photovoltaic module and better conforming to the actual production requirements.

[0059] In a specific embodiment, as Figure 1 shown, along the first direction x, the width of the receiving groove 31 is b, and b satisfies 3 mm ≤ b ≤ 8 mm.

[0060] In the embodiment of the present application, the width b of the receiving groove 31 can specifically be 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm, 7.2 mm, 7.4 mm, 7.6 mm, 7.8 mm, 8 mm, etc.

[0061] When the width of the receiving groove 31 is too small (for example, b is less than 3 mm), the receiving groove 31 is too shallow, and the contact area between the connecting member 4 and the battery cell 1 is too small, resulting in a poor bonding effect between the two, and stress concentration is likely to occur at the edge of the battery cell 1 for the connecting member 4. During the subsequent lamination and / or pressing process, there is a risk of disconnection between the connecting member 4 and the battery cell 1, and there is a risk of hidden cracks in the battery cell 1.

[0062] When the width of the receiving groove 31 is too large (for example, b is greater than 8 mm), the receiving groove 31 is too deep, and the distance between the connecting member 4 and the battery cell 1 is too small, resulting in a reduction in the fixing effect of the film 3 on the welding tape 2. During the subsequent lamination and / or pressing process, there is a risk of disconnection between the welding tape 2 and the battery cell 1.

[0063] Therefore, when the width of the receiving groove 31 satisfies 3 mm ≤ b ≤ 8 mm, the size of the receiving groove 31 in the first direction x is appropriate, so that the contact area between the connecting member 4 and the battery cell 1 is appropriate, in order to ensure a good bonding effect between the connecting member 4 and the battery cell 1 while ensuring a sufficient safety distance between the connecting member 4 and the welding tape 2, so that the film 3 has a sufficient coverage range for the welding tape 2, thereby ensuring the fixing effect of the film 3 on the welding tape 2.

[0064] In a specific embodiment, as Figure 1 shown, along the first direction x, the distance between the receiving groove 31 and the welding tape 2 is L3, and L3 satisfies 0.8 mm ≤ L3 ≤ 3 mm.

[0065] In the embodiment of the present application, the distance L3 between the receiving groove 31 and the welding tape 2 can specifically be 0.8 mm, 0.82 mm, 0.84 mm, 0.86 mm, 0.88 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, etc.

[0066] When the distance between the receiving groove 31 and the welding tape 2 is too small (for example, L3 is less than 0.8 mm), the size of the receiving groove 31 along the first direction x is too large, resulting in a risk of interference between the connecting member 4 and the welding tape 2, which easily affects the stability of the current during transmission. Moreover, during subsequent lamination and / or pressing processes, due to the different coefficients of thermal expansion among the welding tape 2, the film coating 3, and the connecting member 4, local shear stress is likely to be generated among the three, thus there is a risk of delamination, affecting the structural stability at this position.

[0067] When the distance between the receiving groove 31 and the welding tape 2 is too large (for example, L3 is greater than 3 mm), the size of the receiving groove 31 along the first direction x is too small, resulting in too small a contact area between the connecting member 4 and the solar cell 1, leading to a poor bonding effect between the two. Moreover, stress concentration is likely to occur at the edge of the solar cell 1 for the connecting member 4. During subsequent lamination and / or pressing processes, there is a risk of disconnection between the connecting member 4 and the solar cell 1, and a risk of hidden cracks in the solar cell 1.

[0068] Therefore, when the distance between the receiving groove 31 and the welding tape 2 satisfies 0.8 mm ≤ L3 ≤ 3 mm, the size of the receiving groove 31 along the first direction x is appropriate, resulting in an appropriate contact area between the connecting member 4 and the solar cell 1. This can ensure a good bonding effect between the connecting member 4 and the solar cell 1 while ensuring a sufficient safety distance between the connecting member 4 and the welding tape 2, reducing the possibility of interference between the connecting member 4 and the welding tape 2, improving the fixing effect of the film coating 3 on the welding tape 2, and thus ensuring the stability of the current during transmission and the structural stability of the photovoltaic module.

[0069] In a specific embodiment, as Figure 1 、 Figure 2 、 Figure 3 and Figure 4 shown, along the first direction x, at least one end of the film coating 3 is provided with a plurality of receiving grooves 31, the plurality of receiving grooves 31 are spaced apart along the second direction y, the distance between adjacent receiving grooves 31 is L4, and L4 satisfies 20 mm ≤ L4 ≤ 50 mm.

[0070] In the embodiment of the present application, the distance L4 between adjacent accommodating grooves 31 can specifically be 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc.

[0071] When the distance between adjacent receiving grooves 31 is too small (for example, L4 is less than 20mm), the distribution of the receiving grooves 31 along the second direction y is too dense, resulting in a small contact area between the ends of the cover film 3 along the first direction x and the solar cell 1. This affects the adhesion between the ends of the cover film 3 and the solar cell 1, resulting in the risk of warping of the ends of the cover film 3, which in turn affects the structural stability of the photovoltaic module. At the same time, the distance between adjacent receiving grooves 31 also affects the distance between adjacent connectors 4. During the subsequent stacking and / or lamination process, adjacent connectors 4 are prone to interaction, affecting the connection reliability between each connector 4 and the solar cell 1.

[0072] When the distance between adjacent accommodating grooves 31 is too large (for example, L4 is greater than 50 mm), the distribution of the accommodating grooves 31 along the second direction y is too sparse, resulting in low connection reliability between adjacent battery cells 1 distributed along the first direction x, leading to the risk of easy disconnection or relative movement between adjacent battery strings during subsequent stacking and / or lamination, thereby affecting the structural stability of the battery cell layer.

[0073] Therefore, when the distance between adjacent accommodating grooves 31 satisfies 20mm≤L4≤50mm, the distribution of the accommodating grooves 31 along the second direction y is more uniform, so that there is a safe distance between adjacent connecting parts 4, which is beneficial to reducing the impact between adjacent connecting parts 4, and enables the two ends of the coating 3 along the first direction x to have a larger contact area with the battery cell 1, which is beneficial to improving the stability and reliability of the bonding between the end of the coating 3 and the battery cell 1, thereby ensuring the installation stability of the welding strip 2 while improving the connection strength between adjacent battery strings.

[0074] In a specific embodiment, Figure 2 、 Figure 3 and Figure 4 As shown, along the first direction x, both ends of the coating 3 are provided with receiving grooves 31 , and the projections of the receiving grooves 31 at both ends along the first direction x are one of staggered, overlapped or partially overlapped.

[0075] In the embodiments of the present application, when receiving grooves 31 are provided at both ends of the film covering 3 along the first direction x, the cell 1 can be connected to two adjacent cells 1 respectively through two connecting members 4, so as to achieve a firm connection between adjacent cell strings, reduce the possibility of displacement between adjacent cell strings during subsequent lamination and / or pressing processes, and thus contribute to improving the product quality and production yield of the photovoltaic module.

[0076] Optionally, the projections of the receiving grooves 31 at both ends of the film covering 3 along the first direction x may be offset, overlapped or partially overlapped.

[0077] Among them, when the projections of the receiving grooves 31 at both ends of the film covering 3 along the first direction x are offset, the two end connecting members 4 can be distributed offset along the first direction x, so as to form a cross-fixing effect between adjacent cells 1 distributed along the first direction x, thereby reducing the possibility of displacement of adjacent cell strings along the second direction y, and further improving the product quality and production yield of the photovoltaic module.

[0078] Meanwhile, when the projections of the receiving grooves 31 at both ends of the film covering 3 along the first direction x overlap, the two end connecting members 4 are symmetrically distributed about the axis of the cell 1 along the second direction y at both ends of the cell 1, which is beneficial to simplifying the installation process of the connecting member 4, reducing the operation difficulty, and improving the overall production efficiency.

[0079] In addition, when the projections of the receiving grooves 31 at both ends of the film covering 3 along the first direction x are partially overlapped, it has good performance balance and a large tolerance in the installation process of the connecting member 4, so as to take into account both the production efficiency and product quality of the photovoltaic module, and better meet the actual production requirements.

[0080] In a specific embodiment, as Figure 5 and Figure 6 shown, along the second direction y, the distance between the film covering 3 and the edge of the cell 1 is L2. When 1 mm ≤ L2 ≤ 2.5 mm is satisfied, the connecting member 4 is located on at least one side of the film covering 3 facing the edge of the cell 1, so that the film covering 3 and the connecting member 4 are adjacent to each other.

[0081] In the embodiment of the present application, such a design method enables at least one connector 4 to be provided between adjacent battery cells 1 distributed along the first direction x, thereby reducing the offset of the relative displacement between adjacent battery strings during relative displacement between the two, thereby reducing the impact on the photovoltaic module as a whole. Furthermore, by arranging the coating 3 and the connector 4 adjacent to each other, the connector 4 can be distributed on both sides of the coating 3 along the second direction y, so that adjacent battery cells 1 distributed along the first direction x are connected by at least two connectors 4. Even if one of the connectors 4 breaks or falls off, the adjacent battery cells 1 distributed along the first direction x can still maintain a connection relationship through the other connector 4, thereby further improving the stability and reliability of the connection between adjacent battery strings and reducing the possibility of the connector 4 affecting the connection effect of the adjacent battery strings.

[0082] Among them, the distance L2 between the coating 3 and the edge of the battery cell 1 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0083] When the distance between the coating 3 and the edge of the battery cell 1 is too small (for example, L2 is less than 1 mm), along the second direction y, the distance between the long side edge of the coating 3 and the long side edge of the battery cell 1 on the same side is too close, resulting in the area on the battery cell 1 for installing the connector 4 being too small, and the contact area between the connector 4 and the battery cell 1 being too small, which not only affects the connection effect between the connector 4 and the battery cell 1, but also affects the stability between adjacent battery strings.

[0084] When the distance between the coating 3 and the edge of the battery cell 1 is too large (for example, L2 is greater than 2.5 mm), the distance between the long side edge of the coating 3 and the long side edge of the battery cell 1 on the same side is too far along the second direction y, resulting in at least a portion of the welding ribbon 2 along the second direction y not being covered and fixed by the coating 3. During the subsequent stacking and / or lamination process, this portion of the welding ribbon 2 is prone to displacement or warping and other undesirable phenomena, thereby affecting the stability and reliability of the connection between adjacent battery cells 1, and further affecting the structural stability of each battery string.

[0085] Therefore, when the distance between the edge of the film covering 3 and the battery cell 1 satisfies 1 mm ≤ L2 ≤ 2.5 mm, along the second direction y, the distance between the long-edge of the film covering 3 and the long-edge of the battery cell 1 on the same side is appropriate. This can not only provide a relatively large contact area between the connecting member 4 and the battery cell 1, but also ensure that the film covering 3 covers most areas of the welding strip 2. Thus, while ensuring the stable connection between the end of the welding strip 2 and the battery cell 1, the stability and reliability of the connection between adjacent battery strings can be improved.

[0086] In a specific embodiment, as Figure 5 and Figure 6 shown, along the second direction y, the distance between the connecting member 4 and the film covering 3 is L5, and L5 satisfies 3 mm ≤ L5 ≤ 6 mm.

[0087] In the embodiments of the present application, the distance L5 between the connecting member 4 and the film covering 3 can specifically be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, etc.

[0088] When the distance between the connecting member 4 and the film covering 3 is too small (for example, L5 is less than 3 mm), the gap between them is too small. During subsequent lamination and / or pressing processes, since the connecting member 4 expands and deforms thermally and will squeeze against the film covering 3, it is easy for the two to warp upward at the contact interface, thus affecting the connection performance between the connecting member 4 and the film covering 3 and the battery cell 1.

[0089] When the distance between the connecting member 4 and the film covering 3 is too large (for example, L5 is greater than 6 mm), the gap between them is too large. During subsequent lamination and / or pressing processes, even after the connecting member 4 expands and deforms thermally, it cannot completely fill the gap with the film covering 3, resulting in a gap at the edge of the battery cell layer. This not only affects the overall structural stability and structural strength of the battery cell layer, but also poses a risk that external impurities may enter the interior of the battery cell layer through this gap and contaminate the battery cell 1.

[0090] Therefore, when the distance between the connecting member 4 and the film covering 3 satisfies 3 mm ≤ L5 ≤ 6 mm, the gap between them is appropriate, so that the connecting member 4 can fill the gap with the film covering 3 during subsequent lamination and / or pressing processes, to avoid the risk of gaps in the battery cell layer after processing. At the same time, the possibility of mutual extrusion between the connecting member 4 and the film covering 3 can be reduced, to improve the safety and reliability of the battery cell 1.

[0091] In a specific embodiment, as Figure 5 and Figure 6 shown, along the first direction x, the distance between the connecting member 4 and the solder strip 2 is L6, and L6 satisfies 2 mm ≤ L6 ≤ 5 mm.

[0092] In the embodiment of the present application, the distance L6 between the connecting member 4 and the solder strip 2 can specifically be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, etc.

[0093] When the distance between the connecting member 4 and the solder strip 2 is too small (for example, L6 is less than 2 mm), the gap between the two is too small. During subsequent lamination and / or pressing processes, the connecting member 4 is likely to squeeze the end of the solder strip 2 after thermal expansion and deformation, resulting in the part of the solder strip 2 not covered by the film 3 shifting relative to the battery cell 1, thereby affecting the current transmission efficiency of the solder strip 2.

[0094] When the distance between the connecting member 4 and the solder strip 2 is too large (for example, L6 is greater than 5 mm), the gap between the two is too large, causing the arrangement of the solder strip 2 along the first direction x to be too concentrated in the middle area of the battery cell 1, resulting in low space utilization rate of the battery cell 1. And when the distance between adjacent solder strips 2 is too close, there is also a risk of short circuit, thereby affecting the working performance and service life of the photovoltaic module.

[0095] Therefore, when the distance between the connecting member 4 and the solder strip 2 satisfies 2 mm ≤ L6 ≤ 5 mm, the gap between the two is moderate, so as to avoid the risk of the connecting member 4 and the solder strip 2 coming into contact with each other during subsequent lamination and / or pressing processes, ensuring the stability and reliability of the solder strip 2 during operation. At the same time, it can also improve the space utilization rate of the solder strip 2 on the battery cell 1, so as to further improve the current transmission efficiency and the working performance and product quality of the photovoltaic module.

[0096] In a specific embodiment, the material of the film 3 is EVA or POE, and the material of the connecting member 4 is epoxy resin, polyurethane, acrylate or epoxy acrylate.

[0097] In the embodiments of the present application, the material of the connecting member 4 can be thermosetting glue or photocuring glue, so that the connecting member 4 can be positioned and cured in the receiving groove 31 of the coating film 3 before the lamination and pressing processes. When the material of the connecting member 4 is photovoltaic glue, its curing process can be completed independently, so as to simplify the overall manufacturing process and improve production efficiency. At the same time, both the material of the coating film 3 and the material of the connecting member 4 have good adhesiveness and flexibility, which is convenient for forming a more firm connection interface, so that the coating film 3 and the connecting member 4 can be closely attached in a high-temperature environment, so as to further enhance the stability and reliability of the connection between the connecting member 4 and the battery cell 1, thereby further improving the mechanical strength between adjacent battery strings, so that the photovoltaic module can resist stress during transportation, installation or thermal cycling, reduce the risk of disconnection between adjacent battery strings, and thus is beneficial to improving the working performance and service life of the photovoltaic module.

[0098] In a possible implementation manner, taking the coating film 3 having a receiving groove 31 and the connecting member 4 being thermosetting glue as an example, the preparation method of the above photovoltaic module includes: laying the welding tape 2 on the battery cell 1 to connect adjacent battery cells 1 distributed along the second direction y to form a battery string; laying the coating film 3 on the welding tape 2 so that the coating film 3 covers at least part of the welding tape 2 and the battery cell 1; performing a first heating treatment on the coating film 3 so that the coating film 3 wraps the welding tape 2 in a molten state and fixedly connects it to the battery cell 1; coating the connecting member 4 on the battery cells to connect adjacent battery cells 1 distributed along the first direction x, so as to realize the fixed connection between adjacent battery strings and form a battery cell layer. Among them, the coating film 3 has a receiving groove 31, a part of the connecting member 4 is located in the receiving groove 31 on the battery cell 1, and another part of the connecting member 4 is located in the receiving groove 31 on the adjacent battery cell 1, so that the coating film 3 on each battery cell 1 can surround the connecting member 4 along the first direction x and the second direction y; stacking the first cover plate, the first glue film, the battery cell layer, the second glue film and the second cover plate in sequence to form a stacked structure of the photovoltaic module; performing a second heating treatment on the stacked structure and performing multiple pressing treatments so that the connecting member 4 fills the receiving groove 31 in a molten state and makes the adjacent two layers closely fit, thereby obtaining a pressed structure of the photovoltaic module.

[0099] Among them, the temperature during the first heating treatment of the coating film 3 is T1, and T1 satisfies 80°C ≤ T1 ≤ 120°C, and specifically can be 80°C, 82°C, 84°C, 86°C, 88°C, 90°C, 92°C, 94°C, 96°C, 98°C, 100°C, 102°C, 104°C, 106°C, 108°C, 110°C, 112°C, 114°C, 116°C, 118°C, 120°C, etc.

[0100] At the same time, the temperature of the second heating treatment of the stacked assembly is T2, and T2 satisfies 145℃≤T2≤155℃, specifically 145℃, 146℃, 147℃, 148℃, 149℃, 150℃, 151℃, 152℃, 153℃, 154℃, 155℃, etc.

[0101] In addition, the pressure when the stacked components are subjected to multiple lamination treatments is p, and p satisfies 20kPa≤p≤40kPa, and specifically can be 20kPa, 21kPa, 22kPa, 23kPa, 24kPa, 25kPa, 26kPa, 27kPa, 28kPa, 29kPa, 30kPa, 31kPa, 32kPa, 33kPa, 34kPa, 35kPa, 36kPa, 37kPa, 38kPa, 39kPa, 40kPa, etc.

[0102] Optionally, in the process of performing multiple lamination treatments on the stacked components, the first lamination treatment is mainly used to improve the efficiency of exhausting bubbles and to preliminarily locate the positions of each component, laying the foundation for subsequent lamination; the second lamination treatment is mainly used to achieve deep bonding between the layers, and continue to control the thermal stress of the overall stacked structure, and optimize the fluidity and lamination uniformity of the connector 4; the third lamination treatment is mainly used to solidify the structure and release residual stress to improve the quality of the finished product and reduce the defect rate.

[0103] The first lamination process can be performed using a high vacuum to effectively squeeze out air bubbles from the stacked structure, preventing the formation of bubbles at the edges of subsequent photovoltaic modules. This helps improve the bonding between the layers and enhances the structural stability of the photovoltaic module. Furthermore, the negative pressure applied by the high vacuum can initially position the stacked structure, reducing the possibility of relative displacement between the layers during subsequent lamination.

[0104] At the same time, a medium vacuum can be used during the second lamination process. The combination of a medium vacuum and an appropriate temperature can balance the thermal expansion differences of the stacked structure during the lamination process, thereby reducing the possibility of cracks after lamination, thereby helping to improve the production yield of photovoltaic modules.

[0105] In addition, a low vacuum degree can be used during the third lamination process, which can complete the solidification of the laminated structure and release residual stress to form a laminated structure of the photovoltaic module, which is beneficial to improving the mechanical strength and service life of the laminated structure.

[0106] In a possible implementation, the photovoltaic module includes the above lamination structure and a frame. The lamination structure may include a first cover plate, a first encapsulant film, a cell layer, a second encapsulant film, and a second cover plate. The first cover plate is disposed on the light-receiving surface of the photovoltaic module, and the second cover plate is disposed on the backlight surface of the photovoltaic module. Among them, the cell layer includes multiple cell strings connected in parallel by busbars. Each cell string includes multiple cells 1 connected in series by solder tapes 2. Each cell 1 may be a whole cell or a segmented cell that is 1 / N of a whole cell. The specific type of cell can be selected according to actual needs, and the present application does not limit this here.

[0107] In a possible implementation, the type of cell used in the present application is a zero-busbar (0BB) cell. By completely removing the front main busbar of the cell, the front surface of the cell can be completely exposed to sunlight, so as to maximize the light absorption area, which is conducive to reducing optical losses and increasing the short-circuit current Jsc. At the same time, by retaining the fine grid and the back electrode, the cell has a high photoelectric conversion efficiency and a low production cost.

[0108] In a possible implementation, the type of cell used in the present application is a passivated emitter rear cell (PERC). By using a passivation film to passivate the back surface of the cell, it replaces the all-aluminum back surface field of the traditional cell, so as to enhance the internal back reflection of light in the silicon substrate, thereby reducing the recombination rate of the back surface of the cell and enabling it to have a high photoelectric conversion efficiency.

[0109] In a possible implementation, the type of cell used in the present application is a tunnel oxide passivated contact (TOPCon) cell. The cell mainly includes an N-type monocrystalline silicon substrate, a tunneling dielectric layer formed by depositing ultrathin silicon oxide (SiOx) or silicon nitride (SiNx) on the N-type monocrystalline silicon substrate, and a doped polysilicon layer covered on the tunneling dielectric layer. Among them, the passivation effect of the tunneling dielectric layer enables electrons to reach the doped polysilicon layer or the N-type monocrystalline silicon substrate in contact with the tunneling dielectric layer through the tunneling effect, while blocking the passage of holes, reducing the recombination of electrons and holes at the interface, thereby forming a selective transport of carriers, making it have a high photoelectric conversion efficiency and stability, and a low attenuation rate.

[0110] In a possible implementation, the type of solar cell used in this application is an intrinsic thin-film heterojunction cell (Heterojunction with Intrinsic Thin-film, HJT, or Heterojunction with Intrinsic Thin-layer, HIT). This solar cell has a symmetric double-sided cell structure, with N-type crystalline silicon in the middle. On the front side, an intrinsic amorphous silicon thin film and a P-type amorphous silicon thin film are sequentially deposited to form a P-N junction. On the back side, an intrinsic amorphous silicon thin film and an N-type amorphous silicon thin film are sequentially deposited to form a back surface field. Due to the dual passivation effect of the N-type silicon substrate and amorphous silicon on the substrate surface defects of this solar cell, it has a high photoelectric conversion efficiency.

[0111] In a possible implementation, the type of solar cell used in this application is a back contact cell (Back Contact, BC). The two-pole metal grid lines (including the two-pole main grid lines and the two-pole fine grid lines) and the P-N junction of this solar cell are both arranged on the back side of the solar cell, and the two-pole metal grid lines are alternately and spaced apart. This enables the front side (light-receiving surface) of the solar cell to be free from the obstruction of structures such as the two-pole metal grid lines, so that the front side of the solar cell can be completely exposed to sunlight, thereby maximizing the light absorption area, which is conducive to reducing optical losses and increasing the short-circuit current Jsc. At the same time, the back side of this solar cell can allow relatively wide two-pole metal grid lines to reduce the series resistance Rs of the solar cell, thereby increasing the fill factor FF. In addition, the front surface field and good passivation effect of this solar cell can increase the open-circuit voltage gain and the output power of this solar cell, making it have a high photoelectric conversion efficiency.

[0112] In a possible implementation, the type of solar cell used in this application is a perovskite solar cell (Perovskite Solar Cells, PSCs). This solar cell is a new photovoltaic technology based on perovskite-type organometallic halide semiconductors. It uses a semiconductor material with an ABX3 structure to capture sunlight and convert it into electrical energy, where A is a large-volume cation, B is a transition metal ion, and X is a halogen anion, making it have a low production cost.

[0113] The structure, characteristics, and function effects of this application have been described in detail based on the embodiments shown in the drawings above. The above are only the preferred embodiments of this application, but this application is not limited to the scope defined by the drawings. Any changes made according to the concept of this application, or equivalent embodiments modified into equivalent changes, should still be within the protection scope of this application as long as they do not exceed the spirit covered by the specification and the drawings.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: Solar cells; Soldering ribbons, which connect adjacent solar cells to form a cell string; Coating film, which covers at least part of the soldering ribbons and the solar cells; Connectors, which connect adjacent cell strings to form a layer of solar cells; Wherein, along the thickness direction of the photovoltaic module, the soldering ribbons, the coating film and the connectors are on the same side of the solar cells, and the coating film surrounds the connectors along the first direction x and the second direction y, or the coating film and the connectors are adjacent to each other along the second direction y.

2. The photovoltaic module according to claim 1, wherein, Along the second direction y, the distance between the coating film and the edge of the solar cell is L1. When 0.5 mm ≤ L1 ≤ 1.5 mm is satisfied, at least one end of the coating film along the first direction x is provided with a receiving groove for receiving the connectors so that the coating film surrounds the connectors.

3. The photovoltaic module according to claim 2, wherein, The volume of the receiving groove is V1, and the volume of the connectors located in the receiving groove is V2, and 0.4 ≤ V2 / V1 ≤ 0.8 is satisfied.

4. The photovoltaic module according to claim 2, wherein Along the first direction x and the second direction y, the length of the receiving groove is a, and 10 mm ≤ a ≤ 15 mm is satisfied, and the width of the receiving groove is b, and 3 mm ≤ b ≤ 8 mm is satisfied.

5. The photovoltaic module according to claim 2, wherein Along the first direction x, the distance between the receiving groove and the soldering ribbon is L3, and 0.8 mm ≤ L3 ≤ 3 mm is satisfied.

6. The photovoltaic module according to claim 2, characterized in that, Along the first direction x, at least one end of the coating film is provided with a plurality of receiving grooves, and the plurality of receiving grooves are spaced apart along the second direction y, and the distance between adjacent receiving grooves is L4, and 20 mm ≤ L4 ≤ 50 mm is satisfied.

7. The photovoltaic module according to claim 6, wherein, Along the first direction x, receiving grooves are provided at both ends of the coating film, and the projections of the receiving grooves at both ends along the first direction x are one of being offset, overlapping or partially overlapping.

8. The photovoltaic module according to claim 1, wherein, Along the second direction y, the distance between the coating film and the edge of the solar cell is L2. When 1 mm ≤ L2 ≤ 2.5 mm is satisfied, the connectors are located on at least one side of the coating film facing the edge of the solar cell so that the coating film and the connectors are adjacent to each other.

9. The photovoltaic module according to claim 8, wherein, Along the first direction x and the second direction y, the distance between the connectors and the coating film is L5, and 3 mm ≤ L5 ≤ 6 mm is satisfied, and the distance between the connectors and the soldering ribbon is L6, and 2 mm ≤ L6 ≤ 5 mm is satisfied.

10. The photovoltaic module according to any one of claims 1-9, characterized in that, The material of the coating film is EVA or POE, and the material of the connectors is epoxy resin, polyurethane, acrylate or epoxy acrylate.

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