Photovoltaic module and photovoltaic system

Abstract

The invention discloses a photovoltaic module and a photovoltaic system, and the photovoltaic module comprises a battery piece which is provided with a first surface and a second surface which are opposite to each other; the plurality of battery pieces are connected in series through the interconnecting pieces; a plurality of interconnecting pieces are arranged on the first surface of the battery piece at intervals, and a plurality of interconnecting pieces are arranged on the second surface of the battery piece at intervals; the first adhesive layer is laid on the first surface of the battery piece, and the first adhesive layer is located on the side, away from the battery piece, of the interconnection piece; the second adhesive layer is laid on the second surface of the battery piece, and the second adhesive layer is located on the side, away from the battery piece, of the interconnection piece; and the stripping force between the second adhesive layer and the battery piece is greater than the stripping force between the first adhesive layer and the battery piece. Therefore, the bonding force between the second adhesive layer and the battery piece is larger, the bonding of the second adhesive layer is firmer, the phenomenon of delamination of the second adhesive layer is not easy to occur even if the photovoltaic module is used for a long time under the action of gravity, the delamination risk is reduced, and the service life of the photovoltaic module is further prolonged.

Description

Technical Field

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

[0002] A photovoltaic module is equipped with a battery string, which is the core component of the photovoltaic module and can convert solar energy into electrical energy. The battery string usually includes multiple cells arranged at intervals, and two adjacent cells are connected in series through welding strips to collect the current generated by multiple cells.

[0003] During use, photovoltaic modules are generally laid at an angle. After long-term use, delamination often occurs on the back of the photovoltaic modules, which affects the service life of the photovoltaic modules. Summary of the invention

[0004] The purpose of the present application is to provide a photovoltaic module and a photovoltaic system to reduce the delamination phenomenon on the back side of the photovoltaic module and extend the service life of the photovoltaic module.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A photovoltaic module, comprising:

[0007] A battery cell, the battery cell having a first surface and a second surface opposite to each other;

[0008] Multiple interconnecting members, multiple battery cells are connected in series through the interconnecting members; multiple interconnecting members are arranged at intervals on the first surface of the battery cell, and multiple interconnecting members are arranged at intervals on the second surface of the battery cell;

[0009] A first adhesive layer, the first adhesive layer is laid on a first surface of the battery cell, and the first adhesive layer is located on a side of the interconnection member away from the battery cell;

[0010] A second adhesive layer, the second adhesive layer is laid on the second surface of the battery cell, and the second adhesive layer is located on a side of the interconnection member away from the battery cell;

[0011] The peeling force between the second adhesive layer and the second surface is greater than the peeling force between the first adhesive layer and the first surface.

[0012] By adopting the above technical solution, in the actual application of photovoltaic modules, the second surface can be made the backlight surface and the first surface can be made the light-facing surface. After the photovoltaic modules are installed, the second surface is horizontal or tilted downward. Since the peeling force between the second adhesive layer and the second surface of the battery cell is greater than the peeling force between the first adhesive layer and the first surface of the battery cell, the bonding force of the second adhesive layer is greater, and the second adhesive layer is more firmly bonded. Even if it is used for a long time under the action of gravity, or encounters vibration or shaking, it is not easy for the second adhesive layer to delaminate, which reduces the risk of delamination and thus prolongs the service life of the photovoltaic modules.

[0013] In one implementation, the difference between the peeling force between the second adhesive layer and the second surface and the peeling force between the first adhesive layer and the first surface is 0.2N-1.9N. This technical solution can ensure that the second adhesive layer is more firmly bonded and reduce the risk of delamination of the second adhesive layer; at the same time, the difference between the peeling force between the second adhesive layer and the second surface and the peeling force between the first adhesive layer and the first surface will not be too large, reducing the difficulty of processing.

[0014] In one implementation, the first adhesive layer has a plurality of pressing points. With this arrangement, during the process of forming the first adhesive layer, a pressing piece can be used to form a plurality of pressing points, and the first adhesive layer and the battery cell are more firmly bonded through the plurality of pressing points.

[0015] And / or, the projections of the pressing points on the first adhesive layer and the pressing points on the second adhesive layer on the battery cell at least partially do not overlap; in this way, the problems of increased warping and increased bubbles caused by the overlap of the pressing points on the first adhesive layer and the second adhesive layer can be avoided.

[0016] And / or, the peeling force between the second adhesive layer and the interconnection element located on the second surface is greater than the peeling force between the first adhesive layer and the interconnection element located on the first surface. This can further increase the bonding reliability of the second adhesive layer, and also increase the bonding reliability between the second surface and the interconnection element.

[0017] In one implementation, along the extension direction of the interconnection member, the length of the first adhesive layer is greater than or equal to the length of the second adhesive layer. In this way, when the length of the first adhesive layer is greater than the length of the second adhesive layer, the edge of the first adhesive layer can be closer to the edge of the battery cell than the edge of the second adhesive layer. In this way, along the extension direction of the interconnection member, the laying length of the first adhesive layer is longer and not easy to warp. At the same time, the height difference between the edge of the battery cell and the packaging adhesive film is also reduced, the generation of bubbles is reduced, and the product yield is improved.

[0018] In one implementation, along the extension direction of the interconnection member, the ratio of the length of the first adhesive layer to the length of the battery cell is greater than or equal to 0.9; by adopting this technical solution, the edge of the first adhesive layer is closer to the edge of the battery cell, and along the extension direction of the interconnection member, the laying length of the first adhesive layer is longer and not easy to warp up. At the same time, it also reduces the height difference or step between the edge of the battery cell and the packaging film, reduces the generation of bubbles, and improves the product yield.

[0019] And / or, along the extension direction of the interconnection member, the ratio of the length of the second adhesive layer to the length of the battery cell is greater than or equal to 0.82. In this way, compared with the first adhesive layer, the length of the second adhesive layer can be appropriately reduced, thereby saving raw materials for the second adhesive layer and reducing manufacturing costs.

[0020] In one implementation, the orthographic projection area of ​​the first adhesive layer on the cell is larger than the orthographic projection area of ​​the second adhesive layer on the cell. With this technical solution, the first adhesive layer has a larger laying area, and its coverage area of ​​the interconnection parts on the cell is larger, thereby reducing the risk of the edge of the first adhesive layer warping, reducing the generation of bubbles, and improving the product yield.

[0021] In one implementation, along the extension direction of the interconnect, the distance between the edge of the first adhesive layer and the edge of the battery cell is d1, 0mm≤d1≤1mm; thus, along the extension direction of the interconnect, the coverage length of the first adhesive layer is longer, which can reduce the displacement and shaking of the interconnect and improve the welding reliability of the interconnect.

[0022] And / or, along the extension direction of the interconnection member, the distance between the edge of the second adhesive layer and the edge of the battery cell is d2, 0mm≤d2≤5mm. In this way, the gap between the edge of the second adhesive layer and the edge of the battery cell can be appropriately increased, and the length of the second adhesive layer can be appropriately reduced, which can reduce the laying accuracy requirements of the second adhesive layer and improve the laying speed.

[0023] In one implementation, on the surface of the battery cell, along the direction perpendicular to the length of the interconnection piece, the edge of the first adhesive layer and / or the second adhesive layer exceeds the outermost interconnection piece by a distance d3, d3 ≥ 3mm; by adopting this technical solution, it can be ensured that the outer side of the outermost interconnection piece has a first adhesive layer or a second adhesive layer of sufficient width to bond with the battery cell, and it can also be ensured that all interconnections on the surface of the battery cell are covered by the first adhesive layer or the second adhesive layer, thereby reducing the problem of the first adhesive layer and the second adhesive layer warping in this direction. Along the direction perpendicular to the length of the interconnection piece, the distance between the edge of the first adhesive layer and / or the second adhesive layer and the edge of the battery cell is d4, d4 ≥ 1mm. By adopting this technical solution, a suitable gap is left between the first adhesive layer or the second adhesive layer and the edge of the battery cell, so that in the process of welding the interconnection piece, the gap between the first adhesive layer or the second adhesive layer and the edge of the battery cell can be used to continuously identify the relative position between the battery cell and the first adhesive layer or the second adhesive layer, prevent position deviation, and improve product yield.

[0024] In one implementation, along a direction perpendicular to the length of the interconnect, the first surface includes adjacent first and second regions, and the first region is disposed closer to an edge of the first surface than the second region; the first adhesive layer covers the second region but does not cover the first region, and the first region is covered with a packaging film; using this technical solution, during the packaging process, the packaging film is partially bonded to the first adhesive layer and partially bonded to the first region on the battery cell, thereby improving the reliability of the fixation between the packaging film and the battery cell.

[0025] And / or, the second surface includes a third area and a fourth area surrounding the third area, the second adhesive layer covers the third area but does not cover the fourth area, and the fourth area is covered with a packaging film. With this technical solution, for the battery cell, the packaging film is fixedly bonded to the battery cell around the periphery and the middle is bonded to the second adhesive layer, which can improve the fixing reliability between the battery cell, the packaging film, and the second adhesive layer.

[0026] In one implementation, the first adhesive layer and the second adhesive layer are made of different materials. According to the actual application scenario, the first adhesive layer or the second adhesive layer can be made of a relatively low-priced material, thereby reducing the manufacturing cost of the photovoltaic module.

[0027] In one implementation, the first surface is the front side of the cell; the photovoltaic module also includes a packaging film located on the side of the first adhesive layer away from the cell; the packaging film can protect the cell and prevent external water, oxygen, etc. from corroding the cell.

[0028] The first adhesive layer and / or the encapsulating adhesive film comprises an anti-PID material, wherein the anti-PID material has non-polar molecules as saturated bonds, which can effectively prevent the PID phenomenon; and / or,

[0029] The first adhesive layer and / or the encapsulating adhesive film comprises a non-polar material, so that the first surface side of the cell, that is, the light-facing side, can have better anti-PID, heat aging resistance, UV resistance and other properties.

[0030] In one implementation, the first adhesive layer and / or the packaging film includes POE; POE has non-polar molecules as saturated bonds, so using POE to make the first adhesive layer and / or the packaging film on the side of the first adhesive layer facing away from the battery cell can effectively prevent PID phenomenon.

[0031] Alternatively, the first adhesive layer includes multiple stacked sub-adhesive layers, at least one of which is a POE layer; or the encapsulation adhesive film includes multiple stacked sub-adhesive layers, at least one of which is a POE layer. In this case, the front of the cell has a whole POE layer covering its surface, which can provide comprehensive anti-PID function for the cell. At the same time, in the module, there is no POE material laid in the cell gap, string gap, module edge gap and other parts, which can reduce costs while having anti-PID function.

[0032] In one implementation, the crosslinking degree of the first adhesive layer is different from that of the second adhesive layer; and / or, the crosslinking degrees of the first adhesive layer and the second adhesive layer are both greater than or equal to 60% and less than or equal to 96%, so as to improve the fixing reliability of the first and second adhesive layers and the battery cell.

[0033] In one implementation, the first surface is the front side of the battery cell;

[0034] The degree of crosslinking of the first adhesive layer is less than that of the second adhesive layer; and / or, the difference between the degree of crosslinking of the first adhesive layer and the degree of crosslinking of the second adhesive layer is 2%-25%; at this time, the difference in the degree of crosslinking of the first adhesive layer and the second adhesive layer is appropriate, and the requirements for lamination temperature are relatively consistent, which can simplify the process difficulty and improve the efficiency and yield of photovoltaic module production.

[0035] And / or, the water vapor permeability of the first adhesive layer is lower than that of the second adhesive layer. When the water vapor permeability of the first adhesive layer is lower, it can provide a better water vapor barrier effect for the photovoltaic module compared to the second adhesive layer, thereby providing a better water vapor barrier effect at a lower cost.

[0036] In one implementation, along the thickness direction of the battery cell, the height of the interconnection member is X, and the thickness of the first adhesive layer and / or the second adhesive layer at the position not covering the interconnection member is h, where h=mX, 0.42≤m≤0.65; such a configuration can keep the thickness of the first adhesive layer and / or the second adhesive layer within a reasonable range, thereby reducing bubbles in the first adhesive layer and the second adhesive layer and preventing the first adhesive layer and / or the second adhesive layer from being too thick and affecting the light absorption efficiency of the battery cell.

[0037] And / or, the thickness of the first adhesive layer and / or the second adhesive layer is h, 80 μm≤h≤120 μm; the first adhesive layer and the second adhesive layer with this thickness can reduce the risk of bubbles and warping of the adhesive layer while taking the cost into consideration.

[0038] And / or, the gram weight of the first adhesive layer and / or the second adhesive layer is y1, y1=ρ1mX, ρ1 is the density of the first adhesive layer or the second adhesive layer, and the unit of ρ1 is g / m 3 , the unit of X is m, the unit of y1 is g / m 2 In this way, the weight of the first adhesive layer and / or the second adhesive layer can be guaranteed, thereby ensuring a good packaging effect.

[0039] In one implementation, the photovoltaic module further includes a packaging film disposed on a side of the first adhesive layer away from the battery cell and a side of the second adhesive layer away from the battery cell; the thickness of the packaging film is greater than or equal to 240 μm to ensure packaging effect; and / or,

[0040] The weight of the encapsulation film is y2, y2 = [(1-m)X + d]ρ2, where d is the minimum distance from the interconnect to the inside of the cover, X is the height of the interconnect, ρ2 is the density of the encapsulation film, 0.4 ≤ m ≤ 0.6, and the unit of ρ2 is g / m 3 , the unit of X is m, the unit of y2 is g / m 2 Such a configuration can provide sufficient water vapor barrier effect and support function for interconnects with a certain height, provided that the weight of the packaging film of the photovoltaic module satisfies the above formula.

[0041] In one implementation, the photovoltaic module further includes a packaging adhesive film disposed on a side of the first adhesive layer facing away from the battery cell and a side of the second adhesive layer facing away from the battery cell;

[0042] The total thickness of the first adhesive layer and the encapsulating adhesive film at position A is less than the total thickness at position B; and / or the total thickness of the second adhesive layer and the encapsulating adhesive film at position A is less than the total thickness at position B;

[0043] Position A is the position corresponding to the interconnection part, and position B is the position not covering the interconnection part. In this way, the positions B of the first and second adhesive layers, as well as the portion of the position B of the encapsulation film, are all located on the side of the interconnection part; the side of the interconnection part has the first adhesive layer or the second adhesive layer at the bottom and the encapsulation film at the top; at this time, the side of the entire interconnection part is bonded and fixed in position, thereby improving the fixing effect of the interconnection part and reducing the risk of displacement of the interconnection part.

[0044] In one implementation, the first glue layer and / or the second glue layer are bonded to the side surface and the top surface of the interconnection element; and / or,

[0045] The thickness of the first adhesive layer at position A is smaller than the thickness of the first adhesive layer at position B; and / or the thickness of the second adhesive layer at position A is smaller than the thickness of the second adhesive layer at position B;

[0046] Position A is the position of the corresponding interconnection part, and position B is the position where the interconnection part is not covered. In this way, the adhesive layer material with more adhesive layer at position B can fix and position the side of the interconnection part, so that the interconnection part can be limited to the strip area defined by the adhesive film at position B, reducing the distortion of the interconnection part; at the same time, the first adhesive layer and the second adhesive layer are bonded to the side and top surfaces of the interconnection part to enhance the reliability of the fixation of the interconnection part. Even if there is no fixed connection between the bottom part of the interconnection part and the battery cell, the bonding of the top and side surfaces and the limitation of the adhesive layer at position B can greatly improve the alignment accuracy of the interconnection part and reduce position deviation.

[0047] In one implementation, the difference in thickness between position A and position B of the first adhesive layer and / or the second adhesive layer is 0.03 mm to 0.05 mm. When the thickness difference is within the above range, the thickness of the adhesive film on the top of the interconnection element is moderate, which can improve the buffering and fixing effects.

[0048] A photovoltaic system comprises any one of the photovoltaic components described above.

[0049] Compared with the prior art, the beneficial effects of the photovoltaic system provided by the present application are the same as those of the above-mentioned photovoltaic components, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0051] Figure 1 A schematic diagram of a photovoltaic module provided in an embodiment of the present application;

[0052] Figure 2 A cross-sectional view of a cell sheet of a photovoltaic module provided in an embodiment of the present application cut along a plane parallel to the length direction of the interconnection member;

[0053] Figure 3 A schematic diagram of a first surface of a cell sheet of a photovoltaic module provided in an embodiment of the present application;

[0054] Figure 4 A schematic diagram of a first surface of a cell sheet of a photovoltaic module provided in another embodiment of the present application;

[0055] Figure 5 A schematic diagram of the second surface of a cell sheet of a photovoltaic module provided in an embodiment of the present application;

[0056] Figure 6 A cross-sectional view of a cell sheet of a photovoltaic module provided in an embodiment of the present application, cut along a plane perpendicular to the length direction of the interconnection member.

[0057] Reference numerals:

[0058] 1-battery cell, 2-interconnection component, 3-first adhesive layer, 4-encapsulation adhesive film, 5-second adhesive layer. DETAILED DESCRIPTION

[0059] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0062] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0063] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] The present application embodiment provides a photovoltaic module, which includes a cell 1, an interconnection member 2, a first adhesive layer 3 and a second adhesive layer 5. A plurality of cells 1 are connected in series through the interconnection member 2. For example, Figure 1 A schematic diagram of a plurality of battery cells 1 being electrically connected together is provided. Figure 1 As shown, multiple battery cells 1 are arranged in sequence along the first direction to form a battery string, and multiple battery cells 1 in the battery string are connected in series in sequence. Two or more battery strings are arranged in sequence along the first direction to form a group of battery strings, and multiple groups of battery strings are arranged in sequence along the second direction.

[0065] The battery cell 1 has a first surface and a second surface relative to each other, that is, the two surfaces relative to each other along the thickness direction of the battery cell 1 are the first surface and the second surface respectively. In actual use, the first surface may correspond to the light-facing side of the battery cell 1, and the second surface may correspond to the backlight side of the battery cell 1. Multiple interconnects 2 are used to electrically connect adjacent battery cells 1. Specifically, the battery cell 1 is a double-sided battery, and multiple interconnects 2 are arranged at intervals on the first surface of the battery cell 1, and multiple interconnects 2 are arranged at intervals on the second surface of the battery cell 1. The carrier polarities derived from the multiple interconnects 2 on the first surface are opposite to those derived from the multiple interconnects 2 on the second surface.

[0066] like Figure 2 As shown, the first adhesive layer 3 is laid on the first surface of the battery cell 1, and the first adhesive layer 3 is located on the side of the interconnection member 2 facing away from the battery cell 1, that is, the multiple interconnections 2 on the first surface are located between the battery cell 1 and the first adhesive layer 3, so that the multiple interconnections 2 are fixed to the first surface by using the first adhesive layer 3. The second adhesive layer 5 is laid on the second surface of the battery cell 1, and the second adhesive layer 5 is located on the side of the interconnection member 2 facing away from the battery cell 1, that is, the multiple interconnections 2 on the second surface are located between the battery cell 1 and the second adhesive layer 5, so that the multiple interconnections 2 are fixed to the second surface by using the second adhesive layer 5. In the gap between adjacent interconnections 2 on the first surface, the first adhesive layer 3 is directly in contact with and bonded to the area of ​​the battery cell 1 not covered by the interconnection member, and the first adhesive layer is bonded to the interconnection member 2 on the first surface. In the gap between adjacent interconnections 2 on the second surface, the second adhesive layer 5 is directly in contact with and bonded to the area of ​​the battery cell 1 not covered by the interconnection member 2, and the second adhesive layer is bonded to the interconnection member 2 on the second surface.

[0067] The peeling force between the second adhesive layer 5 and the second surface is greater than the peeling force between the first adhesive layer 3 and the first surface, that is, the force required to peel the second adhesive layer 5 from the second surface is greater than the force required to peel the first adhesive layer 3 from the first surface. During the test, the first adhesive layer can be peeled off from the battery cell and its peeling force can be measured. The second adhesive layer can be peeled off from the battery cell and its peeling force can be measured.

[0068] By adopting the above technical solution, in the actual application of photovoltaic modules, the second surface can be made the backlight surface and the first surface can be made the light-facing surface. After the photovoltaic modules are installed, the second surface is horizontal or tilted downward. Since the peeling force between the second adhesive layer 5 and the second surface of the battery cell 1 is greater than the peeling force between the first adhesive layer 3 and the first surface of the battery cell 1, the bonding force of the second adhesive layer 5 is greater, and the second adhesive layer 5 is more firmly bonded. Even if it is used for a long time under the action of gravity, or encounters vibration or shaking, it is not easy for the second adhesive layer 5 to delaminate, which reduces the risk of delamination and thus prolongs the service life of the photovoltaic modules.

[0069] In some embodiments, the difference between the peeling force between the second adhesive layer 5 and the second surface and the peeling force between the first adhesive layer 3 and the first surface is 0.2N-1.9N, that is, the peeling force between the second adhesive layer 5 and the second surface is 0.2N-1.9N greater than the peeling force between the first adhesive layer 3 and the first surface. The adoption of this technical solution can ensure that the second adhesive layer 5 is more firmly bonded and reduce the risk of delamination of the second adhesive layer 5; at the same time, the difference between the peeling force between the second adhesive layer 5 and the second surface and the peeling force between the first adhesive layer 3 and the first surface will not be too large, reducing the difficulty of processing. Optionally, the peeling force between the second adhesive layer 5 and the battery cell 1 is 0.5N-1.5N greater than the peeling force between the first adhesive layer 3 and the battery cell 1.

[0070] Exemplarily, the difference between the peeling force between the second adhesive layer 5 and the battery cell 1 and the peeling force between the first adhesive layer 3 and the battery cell 1 is 0.2N, 0.3N, 0.4N, 0.5N, 0.6N, 0.7N, 0.8N, 0.9N, 1.0N, 1.1N, 1.2N, 1.3N, 1.4N, 1.5N, 1.6N, 1.6N, 1.7N, 1.8N or 1.9N, etc.

[0071] The interconnection member 2 may be a welding strip, and the cross section of the welding strip may be circular, rectangular, triangular, or the like.

[0072] In the actual processing of the photovoltaic module, the first surface of the cell 1 can face upward. In the process of laying the first adhesive layer 3, the gravity of the first adhesive layer 3 alone cannot make the first adhesive layer 3 and the cell 1 firmly bonded. Therefore, in some embodiments, the first adhesive layer 3 has multiple pressing points. In this way, in the process of forming the first adhesive layer 3, multiple pressing points can be formed by a pressing piece, and the first adhesive layer 3 and the cell 1 are more firmly bonded through the multiple pressing points. It can be understood that the multiple pressing points can be multiple concave points or areas on the first adhesive layer 3, and the multiple pressing points can be distributed in multiple rows and columns on the first adhesive layer 3, or can be distributed in multiple concentric rings, or can be distributed irregularly, etc.

[0073] In some embodiments, the peeling force between the second adhesive layer 5 and the interconnection element 2 located on the second surface is greater than the peeling force between the first adhesive layer 3 and the interconnection element 2 located on the first surface. That is, the force required to peel the second adhesive layer 5 from the interconnection element 2 on the second surface is greater than the force required to peel the first adhesive layer 3 from the interconnection element 2 on the first surface. In this way, the bonding reliability of the second adhesive layer 5 can be further increased, and the bonding reliability between the second surface and the interconnection element 2 can also be increased.

[0074] In some embodiments, the projections of the lamination points on the first adhesive layer 3 and the lamination points on the second adhesive layer 5 on the battery cell at least partially do not overlap. For example, the projection of the lamination points of the second adhesive layer 5 on the battery cell includes point m, while the projection of the lamination points of the first adhesive layer on the battery cell does not overlap with point m, or does not completely overlap. In this way, the problem of aggravated warping and aggravated bubbles caused by the overlap of the lamination points on the first adhesive layer 3 and the second adhesive layer 5 can be avoided.

[0075] During the welding process of the interconnection member 2, the first surface of the battery cell 1 faces upward and the second surface faces downward, so the edge of the first adhesive layer 3 on the first surface is easy to warp, and it is more likely to warp when the interconnection member 2 may shake or move. However, the second adhesive layer 5 on the second surface is not easy to warp due to the gravity of the battery cell 1 and the adsorption of the welding platform. After the edge of the first adhesive layer 3 is warped, there is a height difference between the encapsulation film 4 and the battery cell 1 during the lamination process, which causes bubbles to be easily generated near the edge of the battery cell 1, reducing the yield. In view of the above situation, in some embodiments, along the extension direction of the interconnection member 2, the length of the first adhesive layer 3 is greater than or equal to the length of the second adhesive layer 5. In this way, when the length of the first adhesive layer 3 is greater than the length of the second adhesive layer 5, the edge of the first adhesive layer 3 can be closer to the edge of the battery cell 1 than the edge of the second adhesive layer 5. In this way, along the extension direction of the interconnection member 2, the laying length of the first adhesive layer 3 is longer, and it is not easy to warp. At the same time, the height difference between the edge of the battery cell 1 and the encapsulation film 4 is reduced, reducing the generation of bubbles and improving the product yield. In addition, since the risk of warping of the second adhesive layer 5 is relatively small, the length of the second adhesive layer 5 can be appropriately reduced along the extension direction of the interconnection member 2, thereby saving the raw materials of the second adhesive layer 5 and reducing the manufacturing cost. When the length of the first adhesive layer 3 is equal to the length of the second adhesive layer 5, the complexity of the processing technology can be reduced.

[0076] In some embodiments, along the extension direction of the interconnection member 2, the ratio of the length of the first adhesive layer 3 to the length of the battery cell 1 is greater than or equal to 0.9. Figure 3 As shown, along the extension direction of the interconnection member 2, there may be a small gap between the edge of the first adhesive layer 3 and the edge of the battery cell 1; or Figure 4As shown, along the extension direction of the interconnection member 2, the edge of the first adhesive layer 3 coincides with the edge of the battery cell 1, and at this time the length of the first adhesive layer 3 is equal to the length of the battery cell 1. With this technical solution, the edge of the first adhesive layer 3 is closer to the edge of the battery cell 1, and along the extension direction of the interconnection member 2, the laying length of the first adhesive layer 3 is longer and not easy to warp up. At the same time, the height difference or step between the edge of the battery cell 1 and the packaging film 4 is also reduced, the generation of bubbles is reduced, and the product yield is improved. For example, along the extension direction of the interconnection member 2, the ratio of the length of the first adhesive layer 3 to the length of the battery cell 1 is 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99 or 1, etc.

[0077] In other embodiments, along the extension direction of the interconnection member 2, the ratio of the length of the second adhesive layer 5 to the length of the battery cell 1 is greater than or equal to 0.82. Figure 5 As shown, along the extension direction of the interconnection member 2, there can be a large gap between the edge of the first adhesive layer 3 and the edge of the battery cell 1. In this way, compared with the first adhesive layer 3, the length of the second adhesive layer 5 can be appropriately reduced, thereby saving the raw materials of the second adhesive layer 5 and reducing the manufacturing cost. For example, along the extension direction of the interconnection member 2, the ratio of the length of the second adhesive layer 5 to the length of the battery cell 1 is 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99 or 1, etc.

[0078] From the perspective of laying area, the orthographic projection area of ​​the first adhesive layer 3 on the battery cell 1 is larger than the orthographic projection area of ​​the second adhesive layer 5 on the battery cell 1. The length of the first adhesive layer 3 in the extension direction of the interconnection member 2 may be greater than that of the second adhesive layer 5, or the length and width of the first adhesive layer 3 may be greater than those of the second adhesive layer 5. With this technical solution, the laying area of ​​the first adhesive layer 3 is larger, and its coverage area of ​​the interconnection member 2 on the battery cell 1 is larger, thereby reducing the risk of warping at the edge of the first adhesive layer 3, reducing the generation of bubbles, and improving the product yield. In addition, since the risk of warping of the second adhesive layer 5 is relatively small, the laying area of ​​the second adhesive layer 5 can be appropriately reduced, thereby saving the raw materials of the second adhesive layer 5 and reducing the manufacturing cost.

[0079] like Figure 3As shown, along the extension direction of the interconnection member 2, the distance between the edge of the first adhesive layer 3 and the edge of the battery cell 1 is d1, 0mm≤d1≤1mm, so that along the extension direction of the interconnection member 2, the coverage length of the first adhesive layer 3 is longer, which can reduce the displacement and shaking of the interconnection member 2 and improve the welding reliability of the interconnection member 2. For example, d1 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm, etc.

[0080] like Figure 5 As shown, along the extension direction of the interconnection member 2, the distance between the edge of the second adhesive layer 5 and the edge of the battery cell 1 is d2, 0mm≤d2≤5mm. In this way, the gap between the edge of the second adhesive layer 5 and the edge of the battery cell 1 can be appropriately increased, and the length of the second adhesive layer 5 can be appropriately reduced, which can reduce the laying accuracy requirements of the second adhesive layer and improve the laying rate. For example, d2 can be 0.05mm, 0.1mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0081] like Figure 3 As shown, on the surface of the battery cell 1, along the direction perpendicular to the length of the interconnection member 2, the edge of the first adhesive layer 3 and / or the second adhesive layer 5 exceeds the outermost interconnection member 2 by a distance d3, d3 ≥ 3mm, and the first adhesive layer 3 and / or the second adhesive layer 5 cannot exceed the edge of the battery cell 1. Among them, the outermost interconnection member 2 refers to the interconnection member 2 closest to the edge of the battery cell 1 along the direction perpendicular to the length of the interconnection member 2. With this technical solution, it can be ensured that the outer side of the outermost interconnection member 2 has a first adhesive layer 3 or a second adhesive layer 5 of sufficient width to be bonded to the battery cell 1, and it can also be ensured that all the interconnections 2 on the surface of the battery cell 1 are covered by the first adhesive layer 3 or the second adhesive layer 5, thereby reducing the problem of the first adhesive layer 3 and the second adhesive layer 5 warping in this direction. Exemplarily, d3 can be 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm or 6mm, etc.

[0082] like Figure 3 and Figure 5As shown, along the direction perpendicular to the length of the interconnection member 2, the distance between the edge of the first adhesive layer 3 and / or the second adhesive layer 5 and the edge of the battery cell 1 is d4, and d4 ≥ 1mm. With this technical solution, a suitable gap is left between the first adhesive layer 3 or the second adhesive layer 5 and the edge of the battery cell 1, so that in the process of welding the interconnection member 2, the gap between the first adhesive layer 3 or the second adhesive layer 5 and the edge of the battery cell 1 is used to continuously identify the relative position between the battery cell 1 and the first adhesive layer 3 or the second adhesive layer 5, thereby preventing position deviation and improving product yield. For example, d4 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0083] In some embodiments, Figure 3 and Figure 4 As shown, along the direction perpendicular to the length of the interconnection member 2, the first surface includes adjacent first and second regions; compared with the second region, the first region is closer to the edge of the first surface parallel to the interconnection member 2, the first adhesive layer 3 covers the second region but does not cover the first region, and the first region is covered with a packaging film 4. With this technical solution, during the packaging process, the packaging film is partially bonded to the first adhesive layer and partially bonded to the first region on the battery cell, which can improve the fixing reliability between the packaging film and the battery cell.

[0084] like Figure 5 As shown, the second surface includes a third area and a fourth area surrounding the third area, the second adhesive layer 5 covers the third area but does not cover the fourth area, and the fourth area is covered with a packaging film 4. With this technical solution, for the battery cell 1, the packaging film 4 is fixedly bonded to the battery cell 1 around the periphery and the middle is bonded to the second adhesive layer 5, which can improve the fixing reliability between the battery cell 1, the packaging film 4, and the second adhesive layer 5.

[0085] In other embodiments, the materials of the first adhesive layer 3 and the second adhesive layer 5 may be the same or different. In the case where the materials of the first adhesive layer 3 and the second adhesive layer 5 are different, the first adhesive layer 3 or the second adhesive layer 5 may be made of a relatively low-priced material according to the actual application scenario, thereby reducing the manufacturing cost of the photovoltaic module. For example, the material of the second adhesive layer may be EVA, and the material of the second adhesive layer may be EVA (Ethylene Vinyl Acetate Copolymer), POE (Poly Olefin Elastomer), PEP (Phosphoenolpyruvate), etc.

[0086] like Figure 6As shown, the photovoltaic module further includes a packaging film 4 located on the side of the first adhesive layer 3 and / or the second adhesive layer 5 away from the battery cell 1. The packaging film 4 can protect the battery cell 1 and prevent the battery cell 1 from being corroded by external water, oxygen, etc.

[0087] In actual use, PID (Potential Induced Degradation) failure mainly occurs on the light-facing side of the photovoltaic module. Therefore, the first adhesive layer 3 and / or the encapsulation film 4 on the side of the first adhesive layer 3 away from the solar cell 1 may include an anti-PID material. The anti-PID material has non-polar molecules as saturated bonds, which can effectively prevent the PID phenomenon. For example, the first adhesive layer 3 contains an anti-PID material, or the encapsulation film 4 on the outside of the first adhesive layer 3 contains an anti-PID material. Or both the first adhesive layer 3 and the encapsulation film 4 on the outside contain an anti-PID material. Specifically, the anti-PID material can be selected from existing materials on the market.

[0088] The first adhesive layer 3 and / or the encapsulation film 4 on the side of the first adhesive layer 3 facing away from the cell 1 may include non-polar materials. For example, the material included in the encapsulation film has no polar groups. In this way, the first surface side of the cell, i.e., the light-facing side, can have better anti-PID, heat aging resistance, UV resistance and other properties.

[0089] In some embodiments, the first adhesive layer 3 and / or the packaging film 4 on the side of the first adhesive layer 3 facing away from the battery cell 1 includes POE. POE has non-polar molecules as saturated bonds. Therefore, using POE to make the first adhesive layer 3 and / or the packaging film 4 on the side of the first adhesive layer 3 facing away from the battery cell 1 can effectively prevent the PID phenomenon.

[0090] In some embodiments, the first adhesive layer 3 includes a plurality of stacked sub-adhesive layers, and the plurality of sub-adhesive layers are stacked in sequence along the thickness direction of the first adhesive layer 3, and the thicknesses of the plurality of sub-adhesive layers may be the same or different. Among them, at least one sub-adhesive layer is a POE layer, that is, the material of at least one sub-adhesive layer is POE. At this time, there is a whole layer of POE layer covering the surface of the front of the battery cell, which can provide a comprehensive anti-PID function for the battery cell. At the same time, in the component, there is no POE material laid in the cell gap, string gap, component edge gap and other parts, which can reduce costs while having anti-PID function.

[0091] In some embodiments, the packaging film 4 on the side of the first adhesive layer 3 facing away from the battery cell 1 includes multiple stacked sub-adhesive layers, and the multiple sub-adhesive layers are stacked in sequence along the thickness direction of the packaging film 4. The thicknesses of the multiple sub-adhesive layers can be the same or different. Among them, at least one sub-adhesive layer is a POE layer, that is, the material of at least one sub-adhesive layer is POE. POE has a large resistivity and a large barrier rate to water vapor. It is also resistant to ultraviolet radiation and is not easy to yellow, ensuring that the power of the first surface of the battery cell 1 will not decrease due to the yellowing of the first adhesive layer 3.

[0092] Of course, the material of the first adhesive layer 3 may also include EPE (Expandable Polyethylene), which is not limited here.

[0093] In addition, the material of the second adhesive layer 5 may include EVA, which is relatively cheap and can reduce processing costs, and has better adhesion to the back panel. The second adhesive layer 5 may also include multiple stacked sub-adhesive layers, which are stacked in sequence along the thickness direction of the second adhesive layer 5.

[0094] In some embodiments, the crosslinking degree of the first adhesive layer 3 and the crosslinking degree of the second adhesive layer 5 may be the same or different. If the crosslinking degree of the first adhesive layer 3 and the crosslinking degree of the second adhesive layer 5 are too small, the first adhesive layer 3 or the second adhesive layer 5 may flow between the interconnection member 2 and the battery cell 1, affecting the welding effect of the battery cell 1 and the interconnection member 2, resulting in a cold weld. In view of the above situation, in this embodiment, the crosslinking degree of the first adhesive layer 3 and the second adhesive layer 5 are both greater than or equal to 60% and less than or equal to 96%, so as to improve the fixing reliability of the first and second adhesive layers and the battery cell.

[0095] Exemplarily, the crosslinking degree of the first adhesive layer 3 is 60%, 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, 82%, 85%, 88%, 90%, 92%, 95% or 96%. The crosslinking degree of the second adhesive layer 5 is 60%, 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, 82%, 85%, 88%, 90%, 92%, 95% or 96%, etc.

[0096] In some embodiments, when the crosslinking degree of the first adhesive layer 3 is different from that of the second adhesive layer 5, the crosslinking degree of the first adhesive layer 3 is less than that of the second adhesive layer 5. When the first adhesive layer 3 includes an anti-PID material, the material fluidity of the first adhesive layer 3 is poor. When the crosslinking degree of the first adhesive layer 3 is smaller than that of the second adhesive layer 5, the two can provide a more balanced fixing performance and mechanical strength, thereby improving the bonding performance and mechanical strength of the front and back sides of the battery cell 1.

[0097] In some embodiments, the difference between the crosslinking degree of the first adhesive layer 3 and the crosslinking degree of the second adhesive layer 5 is 2%-25%. For example, the difference between the crosslinking degree of the first adhesive layer 3 and the crosslinking degree of the second adhesive layer 5 is 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% or 25%, etc. At this time, the difference between the crosslinking degrees of the first adhesive layer 3 and the second adhesive layer 5 is appropriate, and the requirements for the lamination temperature are relatively consistent, which can simplify the process difficulty and improve the efficiency and yield of photovoltaic module production.

[0098] In some embodiments, the water vapor permeability of the first adhesive layer 3 is less than that of the second adhesive layer 5. During the service life of the photovoltaic module, the front side of the photovoltaic module and the cell, that is, the side of the first adhesive layer 3, is more seriously corroded by water vapor than the back side. Therefore, when the water vapor permeability of the first adhesive layer 3 is lower, it can have a better water vapor barrier effect for the photovoltaic module compared to the second adhesive layer 5, thereby providing a better water vapor barrier effect at a lower cost.

[0099] like Figure 6 As shown, during the lamination process, the first adhesive layer 3 and the second adhesive layer 5 will be bonded to the side and top surface of the interconnection member 2, that is, the first adhesive layer 3 and the second adhesive layer 5 wrap the side and top surface of the interconnection member 2. The thickness of the first adhesive layer 3 at position A is less than the thickness of the first adhesive layer 3 at position B, and / or, the thickness of the second adhesive layer 5 at position A is less than the thickness of the second adhesive layer 5 at position B. Among them, position A is the position corresponding to the interconnection member 2, and position B is the position not covering the interconnection member 2, that is, the thickness of the first adhesive layer 3 at the position not covering the interconnection member 2 is greater than the thickness of the first adhesive layer 3 at the position covering the interconnection member 2, and the thickness of the second adhesive layer 5 at the position not covering the interconnection member 2 is greater than the thickness of the second adhesive layer 5 at the position covering the interconnection member 2. With such arrangement, the adhesive layer material with more material at position B can play a role in fixing and positioning the side of the interconnection component 2, thereby limiting the interconnection component 2 within the strip area defined by the adhesive film at position B, reducing the distortion of the interconnection component 2; at the same time, the first adhesive layer 3 and the second adhesive layer 5 are bonded to the side and top surfaces of the interconnection component 2 to enhance the reliability of fixing the interconnection component 2. Even if there is no fixed connection between the bottom part of the interconnection component 2 and the battery cell 1, the bonding of the top and side surfaces and the limitation of the adhesive layer at position B can greatly improve the alignment accuracy of the interconnection component 2 and reduce positional deviation.

[0100] In some embodiments, the difference in thickness between position A and position B of the first adhesive layer 3 and / or the second adhesive layer 5 is 0.03mm-0.05mm, that is, the difference in thickness between the position where the first adhesive layer 3 and / or the second adhesive layer 5 does not cover the interconnection member 2 and the position where the first adhesive layer 3 and / or the second adhesive layer 5 covers the interconnection member 2 is 0.03mm-0.05mm. It should be understood that the thickness difference here is related to the pressure of the lamination process. The greater the pressure, the thinner the thickness at position A and the greater the difference; the smaller the pressure, the thicker the thickness at position A and the smaller the difference. When the thickness difference is within the above range, the thickness of the adhesive film on the top of the interconnection member 2 is moderate, which can provide a better buffering and fixing effect. Optionally, the difference in thickness between position A and position B of the first adhesive layer 3 and / or the second adhesive layer 5 is 0.03mm-0.04mm.

[0101] Exemplarily, the difference in thickness between position A and position B of the first adhesive layer 3 and / or the second adhesive layer 5 is 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm or 0.05 mm, etc.

[0102] like Figure 6 As shown, in some embodiments, along the thickness direction of the battery cell 1, the height of the interconnection member 2 is X, and the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 at the position not covering the interconnection member 2 is h, h=mX, 0.42≤m≤0.65. In this way, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 can be kept within a reasonable range, which can not only reduce the bubbles in the first adhesive layer 3 and the second adhesive layer 5, but also prevent the first adhesive layer 3 and / or the second adhesive layer 5 from being too thick to affect the light absorption efficiency of the battery cell 1.

[0103] For example, when the height of the interconnection element 2 is 190 μm, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 is 80 μm; when the height of the interconnection element 2 is 184 μm, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 is 92 μm; when the height of the interconnection element 2 is 160 μm, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 is 104 μm; when the height of the interconnection element 2 is 204 μm, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 is 112 μm; when the height of the interconnection element 2 is 250 μm, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 is 120 μm, etc.

[0104] In some embodiments, the gram weight of the first adhesive layer 3 and / or the second adhesive layer 5 is y1, y1=ρ1mX, ρ1 is the density of the first adhesive layer 3 or the second adhesive layer 5, and the unit of ρ1 is g / m 3 , the unit of X is m, the unit of y1 is g / m 2 In this way, the weight of the first adhesive layer 3 and / or the second adhesive layer 5 can be guaranteed, thereby ensuring a good packaging effect.

[0105] In some embodiments, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 is h, 80μm≤h≤120μm, that is, the thickness of the first adhesive layer 3 and / or the second adhesive layer 5 where the interconnection element 2 is not covered is within a reasonable range of 80μm≤h≤120μm, which can be applied to most component products, and the first adhesive layer 3 and the second adhesive layer 5 of this thickness can reduce the risk of bubbles and warping of the adhesive layer while taking into account the cost. Exemplarily, the thickness of the first adhesive layer 3 is 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm or 120μm, etc. The thickness of the second adhesive layer 5 is 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm or 120μm, etc.

[0106] In other embodiments, the photovoltaic module further includes a packaging film 4 disposed on the side of the first adhesive layer 3 away from the cell 1 and the side of the second adhesive layer 5 away from the cell 1, wherein the thickness of the packaging film 4 is greater than or equal to 240 μm, that is, the thickness of the packaging film 4 at the position not covering the interconnection member 2 is greater than or equal to 240 μm, so as to ensure the packaging effect. For example, the thickness of the packaging film 4 is 240 μm, 245 μm, 250 μm, 255 μm, 260 μm, etc.

[0107] In some embodiments, the weight of the encapsulation film 4 is y2, y2 = [(1-m)X + d] ρ2, where d represents the minimum distance from the interconnection member 2 to the inner side of the cover plate, X is the height of the interconnection member 2, and ρ2 is the density of the film, 0.4 ≤ m ≤ 0.6. The unit of ρ2 is g / m 3 , the unit of X is m, the unit of y2 is g / m 2 Such a configuration can provide sufficient water vapor barrier effect and support function for an interconnection member 2 with a certain height, if the gram weight of the packaging film of the photovoltaic module satisfies the above formula.

[0108] like Figure 6 As shown, the photovoltaic module also includes a packaging film 4 arranged on the side of the first adhesive layer 3 facing away from the battery cell 1 and the side of the second adhesive layer 5 facing away from the battery cell 1. Among them, the total thickness of the first adhesive layer 3 and the packaging film 4 at position A is less than the total thickness at position B. The total thickness of the second adhesive layer 5 and the packaging film at position A is less than the total thickness at position B. Position A is the position corresponding to the interconnection part 2, and position B is the position not covering the interconnection part 2. In this way, the position B of the first adhesive layer 3 and the second adhesive layer 5, as well as the part of the position B of the packaging film 4 are all located on the side of the interconnection part 2; the side of the interconnection part 2 has the first adhesive layer 3 or the second adhesive layer 5 at the lower part, and the packaging film 4 at the upper part; at this time, the side of the entire interconnection part 2 is bonded and fixed and fixed in position, thereby improving the fixing effect of the interconnection part 2 and reducing the risk of displacement of the interconnection part 2.

[0109] In addition, the present application also provides a photovoltaic system, which includes any one of the above photovoltaic modules. Compared with the prior art, the beneficial effects of the photovoltaic module provided by the present application can be analyzed with reference to the beneficial effects of solar cells, which will not be repeated here.

[0110] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0111] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A photovoltaic module, characterized in that: include: A battery cell, the battery cell having a first surface and a second surface opposite to each other; A plurality of interconnecting members, wherein a plurality of battery cells are connected in series via the interconnecting members; a plurality of the interconnecting members are arranged at intervals on the first surface of the battery cell, and a plurality of the interconnecting members are arranged at intervals on the second surface of the battery cell; A first adhesive layer, the first adhesive layer is laid on a first surface of the battery cell, and the first adhesive layer is located on a side of the interconnection member away from the battery cell; A second adhesive layer, the second adhesive layer is laid on the second surface of the battery cell, and the second adhesive layer is located on a side of the interconnection member away from the battery cell; The peeling force between the second adhesive layer and the second surface is greater than the peeling force between the first adhesive layer and the first surface.

2. The photovoltaic module according to claim 1, characterized in that: The difference between the peeling force between the second adhesive layer and the second surface and the peeling force between the first adhesive layer and the first surface is in the range of 0.2N-1.9N.

3. The photovoltaic module according to claim 1, characterized in that: The first adhesive layer has a plurality of pressing points; and / or the projections of the pressing points on the first adhesive layer and the pressing points on the second adhesive layer on the battery cell at least partially do not overlap; And / or, the peeling force between the second adhesive layer and the interconnection element located on the second surface is greater than the peeling force between the first adhesive layer and the interconnection element located on the first surface.

4. The photovoltaic module according to claim 1, characterized in that: Along the extension direction of the interconnection member, the length of the first adhesive layer is greater than or equal to the length of the second adhesive layer.

5. The photovoltaic module according to claim 1, characterized in that: Along the extension direction of the interconnection member, the ratio of the length of the first adhesive layer to the length of the battery cell is greater than or equal to 0.9; and / or, Along the extension direction of the interconnection member, the ratio of the length of the second adhesive layer to the length of the battery cell is greater than or equal to 0.

82.

6. The photovoltaic module according to claim 1, characterized in that: The orthographic projection area of ​​the first adhesive layer on the battery cell is greater than the orthographic projection area of ​​the second adhesive layer on the battery cell.

7. The photovoltaic module according to claim 1, characterized in that: Along the extension direction of the interconnection member, the distance between the edge of the first adhesive layer and the edge of the battery cell is d1, 0mm≤d1≤1mm; And / or, along the extension direction of the interconnection member, the distance between the edge of the second adhesive layer and the edge of the battery cell is d2, 0mm≤d2≤5mm.

8. The photovoltaic module according to claim 1, characterized in that: On the surface of the battery cell, along the direction perpendicular to the length of the interconnection piece, the edge of the first adhesive layer and / or the second adhesive layer exceeds the outermost interconnection piece by a distance d3, d3 ≥ 3 mm; along the direction perpendicular to the length of the interconnection piece, the distance between the edge of the first adhesive layer and / or the second adhesive layer and the edge of the battery cell is d4, d4 ≥ 1 mm.

9. The photovoltaic module according to claim 1, characterized in that: Along a direction perpendicular to the length of the interconnection element, the first surface includes a first area and a second area adjacent to each other, and compared with the second area, the first area is arranged closer to the edge of the first surface; the first adhesive layer covers the second area but does not cover the first area, and the first area is covered with a packaging adhesive film; And / or, the second surface includes a third area and a fourth area surrounding the third area, the second adhesive layer covers the third area but does not cover the fourth area, and the fourth area is covered with a packaging adhesive film.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The first adhesive layer and the second adhesive layer are made of different materials.

11. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The first surface is the front side of the cell; the photovoltaic module further comprises a packaging film located on the side of the first adhesive layer away from the cell; The first adhesive layer and / or the encapsulation adhesive film comprises an anti-PID material; and / or, The first adhesive layer and / or the packaging adhesive film comprises a non-polar material.

12. The photovoltaic module according to claim 11, characterized in that: The first adhesive layer and / or the encapsulation adhesive film comprises POE; Alternatively, the first adhesive layer includes a plurality of stacked sub-adhesive layers, at least one of which is a POE layer; or the encapsulation adhesive film includes a plurality of stacked sub-adhesive layers, at least one of which is a POE layer.

13. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The crosslinking degree of the first adhesive layer is different from the crosslinking degree of the second adhesive layer; and / or, the crosslinking degrees of the first adhesive layer and the second adhesive layer are both greater than or equal to 60% and less than or equal to 96%.

14. The photovoltaic module according to claim 13, characterized in that: The first surface is the front side of the battery cell; The crosslinking degree of the first adhesive layer is lower than that of the second adhesive layer; and / or the difference between the crosslinking degree of the first adhesive layer and the crosslinking degree of the second adhesive layer is 2%-25%; and / or the water vapor permeability of the first adhesive layer is lower than that of the second adhesive layer.

15. The photovoltaic module according to any one of claims 1 to 9, characterized in that: Along the thickness direction of the battery cell, the height of the interconnection member is X, and the thickness of the first adhesive layer and / or the second adhesive layer at the position not covering the interconnection member is h, where h=mX, 0.42≤m≤0.65; and / or, the thickness of the first adhesive layer and / or the second adhesive layer is h, 80 μm≤h≤120 μm; And / or, the gram weight of the first adhesive layer and / or the second adhesive layer is y1, y1=ρ1mX, ρ1 is the density of the first adhesive layer or the second adhesive layer, and the unit of ρ1 is g / m 3 , the unit of X is m, the unit of y1 is g / m 2 .

16. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The photovoltaic module further includes a packaging film provided on the first adhesive layer away from the battery cell side and the second adhesive layer away from the battery cell side; the packaging film has a thickness greater than or equal to 240 μm; and / or, The weight of the packaging film is y2, y2 = [(1-m)X + d] ρ2, where d represents the minimum distance from the interconnection component to the inner side of the cover plate, X is the height of the interconnection component, ρ2 is the density of the packaging film, 0.4 ≤ m ≤ 0.6, and the unit of ρ2 is g / m 3 , the unit of X is m, the unit of y2 is g / m 2 .

17. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The photovoltaic module further comprises a packaging adhesive film provided on a side of the first adhesive layer facing away from the battery cell and a side of the second adhesive layer facing away from the battery cell; The total thickness of the first adhesive layer and the packaging adhesive film at position A is less than the total thickness at position B; and / or the total thickness of the second adhesive layer and the packaging adhesive film at position A is less than the total thickness at position B; Position A is the position of the corresponding interconnection element, and position B is the position without the covering interconnection element.

18. The photovoltaic module according to any one of claims 1 to 9, characterized in that: The first adhesive layer and / or the second adhesive layer are bonded to the side surface and the top surface of the interconnection element; and / or, The thickness of the first adhesive layer at position A is smaller than the thickness of the first adhesive layer at position B; and / or the thickness of the second adhesive layer at position A is smaller than the thickness of the second adhesive layer at position B; Position A is the position of the corresponding interconnection element, and position B is the position without the covering interconnection element.

19. The photovoltaic module according to claim 18, characterized in that: The difference in thickness between position A and position B of the first adhesive layer and / or the second adhesive layer is 0.03 mm-0.05 mm.

20. A photovoltaic system, characterized in that: A photovoltaic module comprising any one of claims 1-19.

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