A photovoltaic module

Abstract

The present application is directed to the field of photovoltaic technology, and discloses a photovoltaic module comprising a cell, a welding ribbon, a covering and a connector, wherein the welding ribbon connects adjacent cell sheets to form a cell string, the covering covers the welding ribbon and at least a portion of the cell to fix the welding ribbon on the cell, and the connector connects adjacent cell strings to form a cell layer; wherein the welding ribbon, the covering and the connector are located on the same side of the cell, and the connector is directly connected to the cell to improve the stability and reliability of the connection between the two, and the covering surrounds the connector along a first direction x and a second direction y, or the covering and the connector are adjacently arranged along the second direction y, so that the covering limits the displacement of the connector in the horizontal plane, so as to further reduce the possibility of relative movement between the connector and the cell during subsequent stacking and / or lamination, thereby reducing the possibility of displacement between adjacent cell strings, which is beneficial to improving the product quality and production yield of the photovoltaic module.

Description

Technical Field

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

[0002] In the process of preparing photovoltaic modules, a lamination process is usually used to first fix the soldering ribbon to the battery cell, and then the soldering ribbon is alloyed with the fine grid of the battery cell through a lamination process. This is to achieve the current extraction function of the battery cell while reducing the silver paste consumption in the photovoltaic module production process, thereby reducing the production cost of the photovoltaic module.

[0003] Currently, during the lamination process of photovoltaic modules, in order to prevent adjacent cell strings from shifting, tape is usually set between adjacent cell strings for positioning. However, due to the poor adhesion between the coating and the tape, there is still a risk of cell strings shifting during lamination, which affects the production quality and production yield of photovoltaic modules. Summary of the Invention

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

[0005] The present application provides a photovoltaic module, which includes a cell, a welding ribbon, a covering and a connector, wherein the welding ribbon extends along a second direction y to connect adjacent cell slices to form a cell string, the covering covers at least part of the welding ribbon and the cell, and the connector connects adjacent cell strings along a first direction x to form a cell layer; wherein, along the thickness direction of the photovoltaic module, the welding ribbon, the covering and the connector are located on the same side of the cell; along the second direction y, the distance between the covering and the edge of the cell is L1, when L1 satisfies 0.5mm≤L1≤1.5mm, at least one end of the covering along the first direction x is provided with a receiving groove, and the connector is filled in the receiving groove so that the covering surrounds the connector along the first direction x and the second direction y, and when L1 satisfies 1.5mm<L1≤2.5mm, the connector is provided on at least one side of the covering along the second direction y toward the edge of the cell, so that the covering and the connector are arranged adjacent to each other; the connector is a thermosetting adhesive or a light-curing adhesive.

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

[0007] At the same time, in each battery cell, since the coating can surround the connector along the first direction x and the second direction y, and can be arranged adjacent to the connector along the second direction y, the installation method between the connector and the battery cell is diverse, so that the connection relationship between adjacent battery cells distributed along the first direction x can be adjusted according to actual needs, and then adjacent battery strings can have multiple connection methods, which is conducive to improving the flexibility of assembly and better meeting actual usage needs.

[0008] In a possible implementation, the volume of the receiving groove is V1, the volume of the connecting member in the receiving groove is V2, and V1 and V2 satisfy 0.4≤V2 / V1≤0.8.

[0009] In a possible implementation, along the first direction x and the second direction y, the length of the accommodating groove is a, and a satisfies 10 mm ≤ a ≤ 15 mm, and the width of the accommodating groove is b, and b satisfies 3 mm ≤ b ≤ 8 mm.

[0010] In a possible implementation, along the first direction x, the distance between the receiving groove and the welding strip is L3, and L3 satisfies 0.8 mm ≤ L3 ≤ 3 mm.

[0011] In a possible embodiment, a plurality of accommodating grooves are provided at at least one end of the coating along the first direction x, and the plurality of accommodating grooves are spaced apart along the second direction y. The distance between adjacent accommodating grooves is L4, and L4 satisfies 20mm≤L4≤50mm.

[0012] In a possible implementation, along the first direction x, both ends of the coating are provided with receiving grooves, and the projections of the receiving grooves at both ends along the first direction x are one of staggered, overlapping, or partially overlapping.

[0013] In one possible embodiment, when L1 satisfies 1.5mm<L1≤2.5mm, along the second direction y, the distance between the connector and the coating is L5, and L5 satisfies 3mm≤L5≤6mm, and along the first direction x, the distance between the connector and the welding strip is L6, and L6 satisfies 2mm≤L6≤5mm.

[0014] In a possible implementation, the material of the coating is EVA or POE, and the material of the connector is epoxy resin, polyurethane, acrylate or epoxy acrylate.

[0015] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 is a schematic structural diagram of a battery cell provided in this application in one embodiment;

[0018] Figure 2 This is a schematic structural diagram of the coating provided by this application in the first embodiment;

[0019] Figure 3 This is a schematic structural diagram of the coating provided by this application in a second embodiment;

[0020] Figure 4 is a schematic structural diagram of the coating provided by this application in a third embodiment;

[0021] Figure 5 is a schematic structural diagram of a battery cell provided in this application in another embodiment;

[0022] Figure 6 It is a schematic structural diagram of the coating provided in the fourth embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1-battery cell;

[0025] 2-welding strip;

[0026] 3-Laminating;

[0027] 31-accommodation slot;

[0028] 4-Connectors.

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0030] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0033] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0034] The embodiment of the present application provides a photovoltaic module, such as Figure 1 and Figure 5 As shown, the photovoltaic module includes cells 1, welding ribbons 2, covering films 3 and connectors 4. The welding ribbons 2 connect adjacent cells 1 to form a cell string, the covering films 3 cover the welding ribbons 2 and at least part of the cells 1, and the connectors 4 connect adjacent cell strings to form a cell layer.

[0035] In which, along the thickness direction of the photovoltaic module, the welding ribbon 2, the covering film 3 and the connecting member 4 are located on the same side of the battery cell 1, and the covering film 3 surrounds the connecting member 4 along the first direction x and the second direction y, or the covering film 3 and the connecting member 4 are arranged adjacent to each other along the second direction y.

[0036] In the embodiment of the present application, the length direction of the photovoltaic module is defined as a first direction x, and the width direction of the photovoltaic module is defined as a second direction y.

[0037] Along the thickness direction of the photovoltaic module, the welding ribbon 2 and the connecting member 4 are arranged on the surface of the same side of the battery cell 1. The covering film 3 is located on the side of the welding ribbon 2 facing away from the battery cell 1, and covers the welding ribbon 2 to fix it on the surface of the battery cell 1, so that the fixed connection between the welding ribbon 2 and the battery cell 1 is achieved only by covering the welding ribbon 2 with the covering film 3, which is beneficial to reduce the production cost of the photovoltaic module while ensuring the stability and reliability of the connection between the welding ribbon 2 and the battery cell 1.

[0038] In which, the welding strip 2 can be distributed at intervals along the first direction x and extend along the second direction y, so that adjacent battery cells 1 distributed along the second direction y are connected by the welding strip 2 to form a battery string, and the connector 4 can be distributed on at least one side of the welding strip 2 along the first direction x, and one end of the connector 4 is connected to the battery cell 1, and the other end of the connector 4 is connected to the battery cell 1 in the adjacent battery string, so that adjacent battery strings distributed along the first direction x are connected by the connector 4 to form a battery cell layer.

[0039] Therefore, by directly connecting the connector 4 to 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 being separated from each other can be reduced. This can reduce the possibility of misalignment or offset between adjacent cell 1 or cell strings during subsequent stacking and / or lamination, which is beneficial to improving the structural stability inside the cell layer, and further beneficial to improving the production yield of photovoltaic modules, which is more in line with actual production needs.

[0040] Optionally, the coating 3 can surround the connector 4 along the first direction x and the second direction y so as to limit the movement of the connector 4 within the horizontal plane through the coating 3, thereby avoiding the possibility of disconnection or relative movement between adjacent battery cells 1 distributed along the first direction x due to the movement of the connector 4 relative to the battery cell 1 during the subsequent stacking and / or lamination process, thereby helping to further improve the stability and reliability of the connection between adjacent battery cells 1 distributed along the first direction x.

[0041] At the same time, when the coating 3 surrounds the connector 4 along the first direction x and the second direction y, as shown in FIG. Figure 1 As shown, the connector 4 is located along the first direction x at the short edge of the cell 1 and in the middle of the short edge along the second direction y, i.e., the connector 4 is centered with the cell 1 along the second direction y. This design allows the cell 1 to evenly distribute stress during compression, avoiding the risk of hidden cracks in the cell 1 due to local stress concentration. This helps improve the safety of the cell 1 during subsequent processing, thereby further increasing the production yield of photovoltaic modules.

[0042] In addition, by surrounding and centrally arranging the covering film 3, the connector 4 can be doubly protected, which is beneficial to further reduce the possibility of displacement of the connector 4 relative to the battery cell 1 and improve the structural stability of the battery cell layer.

[0043] Optionally, the coating 3 can be arranged adjacent to the connector 4 along the second direction y, so as to limit the movement of the connector 4 along the first direction x by the welding strip 2, and limit the movement of the connector 4 along the second direction y by the coating 3, thereby avoiding the possibility of disconnection or relative movement between adjacent battery cells 1 distributed along the first direction x due to the movement of the connector 4 relative to the battery cell 1 during the subsequent stacking and / or lamination process, thereby helping to further improve the stability and reliability of the connection between adjacent battery cells 1 distributed along the first direction x.

[0044] At the same time, when the coating 3 and the connecting member 4 are adjacently arranged along the second direction y, as shown in FIG. Figure 5As shown, the connector 4 is located along the first direction x at the edge of the short side of the cell 1, and along the second direction y at the corner area of ​​the short side, that is, the connector 4 is aligned with the cell 1 in the second direction y. In other words, the connector 4 is aligned with the cell 1 in the second direction y. This design allows at least one connector 4 to be present between adjacent cells 1 distributed along the first direction x. This reduces the relative displacement between adjacent cell strings during offset, thereby reducing the impact on the overall photovoltaic module.

[0045] In addition, 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 can be connected through 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 maintain a connection relationship through the other connector 4, so as to further improve the stability and reliability of the connection between adjacent battery strings and reduce the possibility of the connector 4 affecting the connection effect of the adjacent battery strings.

[0046] Therefore, in this embodiment, by directly connecting the connector 4 to the cell 1, the risk of the connector 4 falling off or shifting can be avoided, and the stability and reliability of the connection between the connector 4 and the cell 1 can be improved, thereby reducing the possibility of relative movement between adjacent cell 1 distributed along the first direction x during subsequent stacking and / or lamination, thereby reducing the possibility of displacement between adjacent cell strings, which is beneficial to improving the structural stability within the cell layer and improving the product quality and production yield of the photovoltaic module. At the same time, in each cell 1, since the coating 3 can surround the connector 4 along the first direction x and the second direction y, and can also be arranged adjacent to the connector 4 along the second direction y, the installation method between the connector 4 and the cell 1 is diverse, so that the connection relationship between adjacent cell 1 distributed along the first direction x can be adjusted according to actual needs, thereby enabling adjacent cell strings to have multiple connection methods, which is beneficial to improving assembly flexibility and better meeting actual usage needs.

[0047] In a specific embodiment, Figure 1 As shown, along the second direction y, the distance between the covering film 3 and the edge of the battery cell 1 is L1. When L1 satisfies 0.5mm≤L1≤1.5mm, the covering film 3 is provided with a receiving groove 31 at at least one end along the first direction x. The receiving groove 31 is used to accommodate the connector 4 so that the covering film 3 surrounds the connector 4.

[0048] In the embodiment of the present application, the distance L1 between the coating 3 and the edge of the battery cell 1 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, etc.

[0049] When the distance between the cover film 3 and the edge of the cell 1 is too small (for example, L1 is less than 0.5mm), the distance between the cover film 3 and the long edge of the cell 1 is too close. During the subsequent stacking and / or lamination process, stress concentration is likely to occur on the long edge of the cell 1, resulting in the risk of hidden cracks in the cell 1, thereby affecting the performance of the photovoltaic module. At the same time, the close distance between the cover film 3 and the long edge of the cell 1 will make the cover film 3 more difficult to place during the placement process, thereby affecting the assembly efficiency of the photovoltaic module.

[0050] When the distance between the covering film 3 and the edge of the battery cell 1 is too large (for example, L1 is greater than 1.5 mm), the distance between the covering film 3 and the long side edge of the battery cell 1 is too far, resulting in a reduction in the contact area between the covering film 3 and the welding ribbon 2 and the battery cell 1, and the fixing effect of the covering film 3 on the welding ribbon 2 is reduced. In the subsequent stacking and / or lamination process, the welding ribbon 2 is prone to displacement or warping relative to the battery cell 1, thereby affecting the working performance and production yield of the photovoltaic module.

[0051] When the distance between the film 3 and the edge of the cell 1 satisfies 0.5mm≤L1≤1.5mm, the distance between the film 3 and the long edge of the cell 1 is moderate, so that there is a gap between the film 3 and the long edge of the cell 1, so that the operator can smoothly place the film 3, thereby improving the overall assembly efficiency of the photovoltaic module. At the same time, this gap can also prevent the stress of the film 3 from acting on the long edge of the cell 1, thereby reducing the possibility of hidden cracks in the cell 1 during subsequent stacking and / or lamination, and improving the safety and reliability of the cell 1 during processing. In addition, there is a large contact area between the film 3, the welding ribbon 2 and the cell 1, thereby improving the stability and reliability of the connection between the welding ribbon 2 and the cell 1, reducing the possibility of displacement or deformation of the welding ribbon 2 during subsequent stacking and / or lamination, thereby avoiding the risk of damage to the welding ribbon 2 in subsequent processes, which is conducive to improving the safety and reliability of the welding ribbon 2, and thus improving the production yield of the photovoltaic module.

[0052] In one possible embodiment, along the second direction y, the coating 3 can be centered with the battery cell 1 so that there is a first gap and a second gap between the two ends of the coating 3 along this direction and the two long side edges of the battery cell 1, respectively, and the first gap is equal to the second gap.

[0053] In other embodiments, along the second direction y, the covering film 3 may also be disposed toward any long side edge of the battery cell 1 so that the first gap and the second gap are not equal.

[0054] Therefore, when the distance between the coating 3 and the edge of the battery cell 1 satisfies 0.5mm≤L1≤1.5mm, the coating 3 is provided with a receiving groove 31 for accommodating the connector 4 at at least one end along the first direction x, and the receiving groove 31 has an opening facing the battery cell 1 of the adjacent battery string, so that one end of the connector 4 is located in the receiving groove 31 of the battery cell 1, and the other end of the connector 4 is located in the receiving groove 31 of the other battery cell 1, so as to realize the connection between the connector 4 and the adjacent battery cells 1 distributed along the first direction x.

[0055] In addition, by providing the accommodating groove 31, not only the installation efficiency of the connector 4 can be improved, but also the installation accuracy of the connector 4 can be improved, so that the coating 3 can tightly wrap the connector 4 along the first direction x and the second direction y to limit the movement of the connector 4 along the horizontal direction, reduce the possibility of displacement between the connector 4 and the battery cell 1, and improve the stability and reliability of the connection between adjacent battery cells 1 distributed along the first direction x, thereby improving the connection effect between adjacent battery strings, and further improving the structural stability inside the battery cell layer.

[0056] In one possible embodiment, the shape of the receiving groove 31 along the first direction x and the second direction y can be rectangular, semicircular, or triangular. This design makes the receiving groove 31 simple in structure and easy to process, which helps reduce the difficulty of processing the coating 3.

[0057] In a specific embodiment, Figure 1 As shown, the volume of the accommodating groove 31 is V1, the volume of the connecting member 4 in the accommodating groove 31 is V2, and V1 and V2 satisfy 0.4≤V2 / V1≤0.8.

[0058] In an embodiment of the present application, the connecting member 4 may 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 may 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.

[0059] When the ratio of the volume of the connector 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 connector 4 is less filled in the receiving groove 31, so that the bonding strength between the connector 4 and the battery cell 1 is low, and there is a risk of disconnection. Moreover, due to the large amount of residual space in the receiving groove 31, the coating 3 cannot effectively limit the connector 4, so that during the subsequent stacking and / or lamination process, the connector 4 is easily displaced in the receiving groove 31.

[0060] When the ratio of the volume of the connector 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 connector 4 is filled more in the receiving groove 31, making it easy for the connector 4 to overflow the receiving groove 31 during the subsequent stacking and / or lamination process, resulting in waste of production materials. In addition, excessive connectors 4 are likely to cause a strong squeezing effect on the battery cell 1 when the volume changes, resulting in the risk of hidden cracks in the battery cell 1.

[0061] Therefore, when the ratio of the volume of the connector 4 in the accommodating groove 31 to the volume of the accommodating groove 31 satisfies 0.4≤V2 / V1≤0.8, the connector 4 is filled moderately in the accommodating groove 31, so that the connector 4 can fill the remaining space in the accommodating groove 31 during the subsequent stacking and / or lamination process, so that the accommodating groove 31 can tightly surround the connector 4, thereby avoiding excessive extrusion of the battery cell 1 by the connector 4 while reducing the possibility of displacement of the connector 4 in the horizontal plane, which is beneficial to improving the bonding effect between the connector 4 and the battery cell 1, and improving the product quality and production yield of the photovoltaic module.

[0062] In a specific embodiment, Figure 1 As shown, along the second direction y, the length of the accommodating groove 31 is a, and a satisfies 10 mm ≤ a ≤ 15 mm.

[0063] In the embodiment of the present application, the length a of the accommodating groove 31 can specifically be 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm, 15mm, etc.

[0064] When the length of the accommodating groove 31 is too small (for example, a is less than 10 mm), the accommodating groove 31 is too short, and the contact area between the connector 4 and the battery cell 1 is too small, resulting in poor bonding between the two. In the subsequent stacking and / or lamination process, there is a risk of disconnection between the connector 4 and the battery cell 1.

[0065] When the length of the accommodating groove 31 is too large (for example, a is greater than 15 mm), the accommodating groove 31 is too long, and the contact area between the connector 4 and the battery cell 1 is too large, resulting in a heavier volume of the connector 4, which not only increases the overall weight of the photovoltaic module, but also causes waste of production materials, resulting in increased production costs.

[0066] Therefore, when the length of the accommodating groove 31 satisfies 10mm≤a≤15mm, the size of the accommodating groove 31 along the second direction y is moderate, so that the contact area between the connector 4 and the battery cell 1 is moderate, so as to ensure a good bonding effect between the connector 4 and the battery cell 1 while reducing the input of production materials and reducing the production cost of the photovoltaic module, thereby meeting the purpose of lightweight design of the photovoltaic module and better meeting actual production needs.

[0067] In a specific embodiment, Figure 1 As shown, along the first direction x, the width of the accommodating groove 31 is b, and b satisfies 3mm≤b≤8mm.

[0068] In the embodiment of the present application, the width b of the accommodating groove 31 can specifically be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm, etc.

[0069] When the width of the accommodating groove 31 is too small (for example, b is less than 3 mm), the accommodating groove 31 is too shallow, and the contact area between the connector 4 and the battery cell 1 is too small, resulting in poor bonding between the two, and the connector 4 is prone to stress concentration at the edge of the battery cell 1. In the subsequent stacking and / or lamination process, there is a risk of disconnection between the connector 4 and the battery cell 1, and there is a risk of hidden cracks in the battery cell 1.

[0070] When the width of the accommodating groove 31 is too large (for example, b is greater than 8 mm), the accommodating groove 31 is too deep, and the distance between the connector 4 and the battery cell 1 is too small, resulting in a reduced fixing effect of the film 3 on the welding ribbon 2. During the subsequent stacking and / or lamination process, there is a risk of disconnection between the welding ribbon 2 and the battery cell 1.

[0071] Therefore, when the width of the accommodating groove 31 satisfies 3mm≤b≤8mm, the size of the accommodating groove 31 along the first direction x is moderate, so that the contact area between the connector 4 and the battery cell 1 is moderate, so as to ensure a good bonding effect between the connector 4 and the battery cell 1 while ensuring a sufficient safety distance between the connector 4 and the welding strip 2, so that the film 3 has sufficient coverage of the welding strip 2, thereby ensuring the fixing effect of the film 3 on the welding strip 2.

[0072] In a specific embodiment, Figure 1 As shown, along the first direction x, the distance between the receiving groove 31 and the soldering strip 2 is L3, and L3 satisfies 0.8 mm ≤ L3 ≤ 3 mm.

[0073] In an embodiment of the present application, the distance L3 between the accommodating groove 31 and the welding strip 2 can specifically be 0.8mm, 0.82mm, 0.84mm, 0.86mm, 0.88mm, 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, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, etc.

[0074] When the distance between the accommodating groove 31 and the soldering strip 2 is too small (for example, L3 is less than 0.8 mm), the size of the accommodating groove 31 along the first direction x is too large, so that there is a risk of interference between the connector 4 and the soldering strip 2, which is likely to affect the stability of the current during transmission. In the subsequent stacking and / or lamination process, due to the different thermal expansion coefficients among the soldering strip 2, the coating 3 and the connector 4, local shear stress is easily generated between the three, resulting in the risk of delamination, affecting the structural stability at this position.

[0075] When the distance between the accommodating groove 31 and the welding strip 2 is too large (for example, L3 is greater than 3 mm), the size of the accommodating groove 31 along the first direction x is too small, so that the contact area between the connector 4 and the battery cell 1 is too small, resulting in poor bonding between the two, and the connector 4 is prone to stress concentration at the edge of the battery cell 1. In the subsequent stacking and / or lamination process, there is a risk of disconnection between the connector 4 and the battery cell 1, and there is a risk of hidden cracks in the battery cell 1.

[0076] Therefore, when the distance between the accommodating groove 31 and the welding strip 2 satisfies 0.8mm≤L3≤3mm, the size of the accommodating groove 31 along the first direction x is moderate, so that the contact area between the connector 4 and the battery cell 1 is moderate, so as to ensure a good bonding effect between the connector 4 and the battery cell 1 while ensuring that there is a sufficient safety distance between the connector 4 and the welding strip 2, so as to reduce the possibility of interference between the connector 4 and the welding strip 2, and improve the fixing effect of the coating 3 on the welding strip 2, thereby ensuring the stability of the current during transmission and the structural stability of the photovoltaic module.

[0077] In a specific embodiment, Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, along the first direction x, at least one end of the coating 3 is provided with a plurality of receiving grooves 31 , and 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 20mm≤L4≤50mm.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] In the embodiment of the present application, when the coating 3 is provided with a receiving groove 31 at both ends along the first direction x, the cell 1 can be connected to two adjacent cell cells 1 through two connectors 4 respectively, thereby achieving a stable connection between adjacent cell strings, so as to reduce the possibility of displacement between adjacent cell strings during subsequent stacking and / or lamination, thereby helping to improve the product quality and production yield of photovoltaic modules.

[0084] Optionally, the projections of the receiving grooves 31 at both ends of the coating 3 along the first direction x may be staggered, overlapped, or partially overlapped.

[0085] Among them, when the accommodating grooves 31 at both ends of the coating 3 are misaligned along the projection of the first direction x, the connecting parts 4 at both ends can be staggered along the first direction x, so that a cross-fixing effect is formed between adjacent battery cells 1 distributed along the first direction x, thereby reducing the possibility of displacement of adjacent battery strings along the second direction y, and further improving the product quality and production yield of photovoltaic modules.

[0086] At the same time, when the projections of the receiving grooves 31 at both ends of the coating 3 along the first direction x overlap, the connecting parts 4 at both ends are symmetrically distributed at both ends of the battery cell 1 relative to the axis of the battery cell 1 along the second direction y, which is conducive to simplifying the installation process of the connecting parts 4, reducing the difficulty of operation, and improving overall production efficiency.

[0087] In addition, when the projections of the receiving grooves 31 at both ends of the coating 3 along the first direction x partially overlap, it has good performance balance and a large fault tolerance in the installation process of the connector 4, so as to take into account both the production efficiency and product quality of the photovoltaic module, which is more in line with actual production needs.

[0088] In a specific embodiment, Figure 5 and Figure 6 As shown, along the second direction y, the distance between the cover 3 and the edge of the battery cell 1 is L1. When L1 satisfies 1.5mm<L1≤2.5mm, the connector 4 is located on at least one side of the cover 3 facing the edge of the battery cell 1, so that the cover 3 and the connector 4 are arranged adjacent to each other.

[0089] 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.

[0090] The distance L1 between the covering film 3 and the edge of the battery cell 1 may be 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, etc.

[0091] When the distance between the coating 3 and the edge of the battery cell 1 is too small (for example, L1 is less than 1.5 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.

[0092] When the distance between the coating 3 and the edge of the battery cell 1 is too large (for example, L1 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.

[0093] Therefore, when the distance between the coating 3 and the edge of the battery cell 1 satisfies 1.5mm<L1≤2.5mm, 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 moderate, which can not only ensure that there is a larger contact area between the connector 4 and the battery cell 1, but also ensure that the coating 3 covers most of the area of ​​the welding strip 2, thereby ensuring that the end of the welding strip 2 is firmly connected to the battery cell 1 while improving the stability and reliability of the connection between adjacent battery strings.

[0094] In a specific embodiment, Figure 5 and Figure 6 As shown, along the second direction y, the distance between the connecting member 4 and the coating 3 is L5, and L5 satisfies 3mm≤L5≤6mm.

[0095] In the embodiment of the present application, the distance L5 between the connector 4 and the coating 3 can be 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, etc.

[0096] When the distance between the connector 4 and the covering film 3 is too small (for example, L5 is less than 3 mm), the gap between the two is too small. During the subsequent stacking and / or lamination process, the connector 4 will be squeezed against the covering film 3 due to thermal expansion and deformation, causing the two to easily warp upward at the contact interface, thereby affecting the connection performance between the connector 4 and the covering film 3 and the battery cell 1.

[0097] When the distance between the connector 4 and the coating 3 is too large (for example, L5 is greater than 6 mm), the gap between the two is too large. During the subsequent stacking and / or lamination process, even if the connector 4 is deformed by thermal expansion, it cannot completely fill the gap between the connector 4 and the coating 3, resulting in gaps at the edges of the battery cell layer. This not only affects the overall structural stability and strength of the battery cell layer, but also poses a risk of external impurities entering the battery cell layer through the gaps and contaminating the battery cell 1.

[0098] Therefore, when the distance between the connector 4 and the coating 3 satisfies 3mm≤L5≤6mm, the gap between the two is moderate, so that the connector 4 can fill the gap between the coating 3 during the subsequent stacking and / or lamination process, so as to avoid the risk of gaps in the battery cell layer after processing. At the same time, it can reduce the possibility of mutual compression between the connector 4 and the coating 3, so as to improve the safety and reliability of the battery cell 1.

[0099] In a specific embodiment, Figure 5 and Figure 6 As shown, along the first direction x, the distance between the connecting member 4 and the welding strip 2 is L6, and L6 satisfies 2mm≤L6≤5mm.

[0100] In the embodiment of the present application, the distance L6 between the connector 4 and the welding strip 2 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0101] When the distance between the connector 4 and the soldering ribbon 2 is too small (for example, L6 is less than 2 mm), the gap between the two is too small. During the subsequent stacking and / or lamination process, the connector 4 is likely to squeeze the end of the soldering ribbon 2 after thermal expansion and deformation, causing the portion of the soldering ribbon 2 not covered by the film 3 to be offset relative to the battery cell 1, thereby affecting the current transmission efficiency of the soldering ribbon 2.

[0102] When the distance between the connector 4 and the welding ribbon 2 is too large (for example, L6 is greater than 5 mm), the gap between the two is too large, so that the arrangement of the welding ribbon 2 along the first direction x is too concentrated in the middle area of ​​the battery cell 1, resulting in low space utilization of the battery cell 1. When the distance between adjacent welding ribbons 2 is too close, there is also a risk of short circuit, which affects the working performance and service life of the photovoltaic module.

[0103] Therefore, when the distance between the connector 4 and the welding ribbon 2 satisfies 2mm≤L6≤5mm, the gap between the two is moderate, so that the connector 4 can avoid the risk of contact between the connector 4 and the welding ribbon 2 during the subsequent stacking and / or lamination process, ensuring the stability and reliability of the welding ribbon 2 during operation. At the same time, it can also improve the space utilization of the welding ribbon 2 on the battery cell 1, so as to further improve the current transmission efficiency and improve the working performance and product quality of the photovoltaic module.

[0104] In a specific embodiment, the material of the coating 3 is EVA or POE, and the material of the connector 4 is epoxy resin, polyurethane, acrylate or epoxy acrylate.

[0105] In the embodiment of the present application, the material of the connector 4 can be a thermosetting adhesive or a photosetting adhesive, so that the connector 4 can be positioned and cured in the receiving groove 31 of the coating 3 before the stacking and lamination process, and when the material of the connector 4 is a photosetting adhesive, its curing process can be completed independently, so as to simplify the overall manufacturing process and improve production efficiency. At the same time, the material of the coating 3 and the material of the connector 4 both have good adhesion and flexibility, which facilitates the formation of a more solid connection interface, so that the coating 3 and the connector 4 can fit tightly in a high temperature environment, so as to further enhance the stability and reliability of the connection between the connector 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 of adjacent battery strings, and thus help improve the working performance and service life of the photovoltaic module.

[0106] In one possible embodiment, taking the coating 3 having a receiving groove 31 and the connector 4 being a thermosetting adhesive as an example, the preparation method of the above-mentioned photovoltaic module includes: laying the welding tape 2 on the battery cell 1 to connect the adjacent battery cells 1 distributed along the second direction y to form a battery string; laying the coating 3 on the welding tape 2 so that the coating 3 covers at least part of the welding tape 2 and the battery cell 1; performing a first heating treatment on the coating 3 so that the coating 3 wraps the welding tape 2 in a molten state and fixes it to the battery cell 1; applying the connector 4 on the battery cell to connect the adjacent battery cells 1 distributed along the first direction x, thereby achieving a fixed connection between adjacent battery strings to form a battery. The cell layer, wherein the covering film 3 has a receiving groove 31, a part of the connector 4 is located in the receiving groove 31 on the cell 1, and the other part of the connector 4 is located in the receiving groove 31 on the adjacent cell 1, so that the covering film 3 on each cell 1 can surround the connector 4 along the first direction x and the second direction y; the first cover plate, the first adhesive film, the cell layer, the second adhesive film and the second cover plate are stacked in sequence to form a laminated structure of the photovoltaic module; the laminated structure is subjected to a second heating treatment and multiple lamination treatments to enable the connector 4 to fill the receiving groove 31 in a molten state and to enable the two adjacent layers to fit tightly together, thereby obtaining a laminated structure of the photovoltaic module.

[0107] Among them, the temperature when the coating 3 is heated for the first time is T1, and T1 satisfies 80℃≤T1≤120℃, and specifically can be 80℃, 82℃, 84℃, 86℃, 88℃, 90℃, 92℃, 94℃, 96℃, 98℃, 100℃, 102℃, 104℃, 106℃, 108℃, 110℃, 112℃, 114℃, 116℃, 118℃, 120℃, etc.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] In one possible embodiment, a photovoltaic module includes the aforementioned laminated structure and a frame. The laminated structure may include a first cover plate, a first adhesive film, a cell layer, a second adhesive film, and a second cover plate. The first cover plate is disposed on the light-receiving side of the photovoltaic module, and the second cover plate is disposed on the backlight side of the photovoltaic module. The cell layer includes a plurality of cell strings connected in parallel by busbars, each cell string including a plurality of cell cells 1 connected in series by welding ribbons 2. Each cell cell 1 may be a whole cell or a cell cell that is one-Nth of a whole cell. The specific cell type may be selected based on actual needs and is not limited in this application.

[0115] In one possible embodiment, the cell type used in this application is a busbar-less cell (ZeroBusbar, 0BB). The cell completely removes the front busbar so that the front side of the cell can be fully exposed to sunlight to maximize the light absorption area, thereby helping to reduce optical losses and increase the short-circuit current Jsc; at the same time, the cell retains the fine grid and back electrode to have a higher photoelectric conversion efficiency and lower production cost.

[0116] In one possible embodiment, the cell type used in the present application is a Passivated Emitter Rear Cell (PERC), which uses a passivation film to passivate the back of the cell, replacing the all-aluminum back field of the traditional cell, to enhance the internal back reflection of light in the silicon substrate, thereby reducing the recombination rate on the back of the cell and making it have a higher photoelectric conversion efficiency.

[0117] In one possible embodiment, the cell type used in this application is a tunnel oxide passivated contact cell (TOPCon), which mainly includes an N-type single crystal silicon substrate, a tunnel dielectric layer formed by ultra-thin silicon oxide (SiOx) or silicon nitride (SiNx) deposited on the N-type single crystal silicon substrate, and a doped polysilicon layer covering the tunnel dielectric layer. The passivation effect of the tunnel dielectric layer enables electrons to reach the doped polysilicon layer or the N-type single crystal silicon substrate in contact with the tunnel dielectric layer through the tunnel effect, while blocking the passage of holes, reducing the recombination of electrons and holes at the interface, thereby forming selective carrier transmission, resulting in higher photoelectric conversion efficiency and stability, as well as lower attenuation rate.

[0118] In one possible embodiment, the cell type used in the present application is an intrinsic thin film heterojunction cell (Heterojunction with Intrinsic Thin-film, HJT, or Heterojunction with Intrinsic Thin-layer, HIT). The cell has a symmetrical double-sided cell structure, with N-type crystalline silicon in the middle, and an intrinsic amorphous silicon film and a P-type amorphous silicon film deposited in sequence on the front to form a PN junction, and an intrinsic amorphous silicon film and an N-type amorphous silicon film deposited in sequence on the back to form a back surface field. Due to the dual passivation effect of the N-type silicon substrate and amorphous silicon of the cell on the surface defects of the substrate, it has a higher photoelectric conversion efficiency.

[0119] In one possible embodiment, the cell type used in the present application is a back contact cell (BC), in which the bipolar metal grid lines (including bipolar main grid lines and bipolar fine grid lines) and the PN junction of the cell are arranged on the back of the cell, and the bipolar metal grid lines are distributed at alternating intervals, so that the front side (light-receiving side) of the cell is not blocked by structures such as the bipolar metal grid lines, so that the front side of the cell can be fully exposed to sunlight to maximize the light absorption area, thereby helping to reduce optical losses and increase the short-circuit current Jsc; at the same time, the back side of the cell can allow wider bipolar metal grid lines to reduce the series resistance Rs of the cell to increase the fill factor FF; in addition, the front surface field of the cell and the good passivation effect can increase the gain of the open circuit voltage, increase the output power of the cell, and make it have a higher photoelectric conversion efficiency.

[0120] In one possible embodiment, the cell type used in this application is a perovskite solar cell (PSCs), which is a new photovoltaic technology based on perovskite-type organic metal halide semiconductors. It uses a semiconductor material with an ABX3 structure to capture sunlight and convert it into electrical energy, where A is a bulky cation, B is a transition metal ion, and X is a halogen anion, which makes it have a lower production cost.

[0121] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic module comprises: Battery cells; a welding ribbon extending along a second direction y to connect adjacent battery cells to form a battery string; a covering film, the covering film covering at least a portion of the welding ribbon and the battery cell; A connector, wherein the connector connects adjacent battery strings along a first direction x to form a battery layer; Wherein, along the thickness direction of the photovoltaic module, the welding ribbon, the covering film and the connecting member are located on the same side of the solar cell; Along the second direction y, the distance between the covering film and the edge of the battery cell is L1. When L1 satisfies 0.5 mm ≤ L1 ≤ 1.5 mm, a receiving groove is provided at at least one end of the covering film along the first direction x, and the connector is filled in the receiving groove so that the covering film surrounds the connector along the first direction x and the second direction y. When L1 satisfies 1.5 mm < L1 ≤ 2.5 mm, the connector is provided on at least one side of the covering film along the second direction y toward the edge of the battery cell, so that the covering film and the connector are provided adjacent to each other. The connecting piece is a thermosetting adhesive or a light-curing adhesive.

2. The photovoltaic module according to claim 1, characterized in that The volume of the receiving groove is V1, the volume of the connecting member in the receiving groove is V2, and V1 and V2 satisfy 0.4≤V2 / V1≤0.

8.

3. The photovoltaic module according to claim 1, characterized in that Along the first direction x and the second direction y, the length of the accommodating groove is a, and a satisfies 10 mm ≤ a ≤ 15 mm, and the width of the accommodating groove is b, and b satisfies 3 mm ≤ b ≤ 8 mm.

4. The photovoltaic module according to claim 1, characterized in that Along the first direction x, the distance between the receiving groove and the welding strip is L3, and L3 satisfies 0.8mm≤L3≤3mm.

5. The photovoltaic module according to claim 1, characterized in that Along the first direction x, at least one end of the coating is provided with a plurality of the accommodating grooves, and the plurality of the accommodating grooves are spaced apart along the second direction y. The distance between adjacent accommodating grooves is L4, and L4 satisfies 20mm≤L4≤50mm.

6. The photovoltaic module according to claim 5, characterized in that: Along the first direction x, the accommodating grooves are provided at both ends of the coating, and the projections of the accommodating grooves at both ends along the first direction x are one of staggered, overlapped or partially overlapped.

7. The photovoltaic module according to claim 1, characterized in that When L1 satisfies 1.5mm<L1≤2.5mm, along the second direction y, the distance between the connecting member and the coating is L5, and L5 satisfies 3mm≤L5≤6mm, and along the first direction x, the distance between the connecting member and the welding strip is L6, and L6 satisfies 2mm≤L6≤5mm.

8. The photovoltaic module according to any one of claims 1 to 7, characterized in that: The material of the coating is EVA or POE, and the material of the connecting piece is epoxy resin, polyurethane, acrylate or epoxy acrylate.

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