Photovoltaic module

Abstract

The application discloses a photovoltaic module, and relates to the technical field of photovoltaic technology, which comprises a back plate, a first adhesive film, a cell layer, a second adhesive film and a front plate which are arranged in a laminated mode along the thickness direction of the photovoltaic module, wherein the first adhesive film and the second adhesive film are respectively arranged on the two sides of the cell layer, the back plate is arranged on the side of the first adhesive film away from the cell layer, and the front plate is arranged on the side of the second adhesive film away from the cell layer; the photovoltaic module further comprises a buffer layer which is arranged between the back plate and the first adhesive film; the back plate has a rectangular structure and comprises four corner regions; and the buffer layer comprises a buffer belt which is arranged at least in the corner regions and a central region of the photovoltaic module. When the photovoltaic module is subjected to external force, the buffer belt can disperse the external force, thereby reducing the damage of the external force to the cell layer and reducing the problems of broken pieces and black pieces of the cell piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic, more particularly, to a photovoltaic module. BACKGROUND

[0002] The existing backboard of the photovoltaic module has poor compression resistance, especially in the process of production, transportation or installation, the flexible backboard of the single-glass module is in contact with other objects, or is extruded or jolted in the transportation process, which easily causes the internal cell pieces of the module to be cracked or blackened. With the trend of cost reduction and cell thinning, the cells in the single-glass module are more likely to be cracked or blackened when stressed, which causes the module to have low power and poor reliability, and even causes the module to be scrapped, resulting in great waste. SUMMARY

[0003] Therefore, the present application provides a photovoltaic module to reduce the problem of cracking or blackening of the photovoltaic module under stress.

[0004] The present application provides a photovoltaic module, comprising a backboard, a first adhesive film, a cell layer, a second adhesive film and a front plate which are stacked in the thickness direction of the photovoltaic module, wherein the first adhesive film and the second adhesive film are respectively located on both sides of the cell layer, the backboard is located on the side of the first adhesive film away from the cell layer, and the front plate is located on the side of the second adhesive film away from the cell layer.

[0005] The photovoltaic module further comprises a buffer layer located between the backboard and the first adhesive film; the backboard has a rectangular structure, and the backboard comprises four corner regions; the buffer layer comprises a buffer strip, and the buffer strip is located at least in the corner regions and a central region of the photovoltaic module.

[0006] Optionally, the buffer strip comprises a first buffer strip and a second buffer strip, the first buffer strip and the second buffer strip are arranged in a cross manner, and the first buffer strip and the second buffer strip at least partially overlap with diagonal lines of the rectangular structure.

[0007] Optionally, the first buffer strip and the second buffer strip respectively extend to the corner regions, and the first buffer strip and the second buffer strip each comprise a corner buffer portion located in the corner regions.

[0008] The backboard comprises a backboard adhesive film arranged towards the first adhesive film, and the corner buffer portions are fixed with the backboard adhesive film and the first adhesive film respectively.

[0009] Optionally, the corner buffer portion comprises a hollow portion penetrating through the corner buffer portion in the thickness direction of the buffer strip, and at least part of the backboard adhesive film and / or at least part of the first adhesive film is filled in the hollow portion.

[0010] Optionally, the corner buffer part comprises a recessed part on one side of the back plate adhesive film, and at least part of the back plate adhesive film is filled in the recessed part.

[0011] Optionally, the corner buffer part and the back plate adhesive film are fixed by melting the back plate adhesive film; and the corner buffer part and the first adhesive film are fixed during lamination.

[0012] Optionally, the minimum distance between the corner buffer part and the edge of the corner area of the back plate is D0, wherein D0≥4mm±0.5mm, and the edge of the corner buffer part is located outside the periphery of the battery sheet in the battery layer.

[0013] Optionally, the back plate comprises a back plate hole arranged to avoid the intersection of the first buffer strip and the second buffer strip.

[0014] Optionally, the thickness of the buffer strip is D1, and D1=0.2mm±0.05mm; and the width of the buffer strip is S1, and S1=4mm±1mm.

[0015] Optionally, the photovoltaic module comprises a busbar.

[0016] The buffer strip is an insulating material resistant to at least 200℃; or the buffer strip is made of the same material as the busbar.

[0017] Compared with the prior art, the photovoltaic module provided by the application at least achieves the following beneficial effects:

[0018] In the photovoltaic module provided by the application, a buffer layer is introduced between the back plate and the first adhesive film. For a rectangular back plate, there are four corner areas, and the buffer strip in the buffer layer is located at least in the four corner areas and the central area of the photovoltaic module. Considering that when the photovoltaic module is subjected to external force, battery sheet fragments or black patches are likely to occur at the four corner positions and the central position of the photovoltaic module, the buffer strip is arranged at least in the corner area of the back plate of the photovoltaic module and the central area of the photovoltaic module. When subjected to external force, the buffer strip can disperse the external force, avoiding the concentration of external force at a certain position of the photovoltaic module, thereby reducing the possibility of breaking or blackening of the battery layer in the photovoltaic module and avoiding the waste of product cost.

[0019] Of course, any product implementing the application does not necessarily need to achieve all the technical effects described above at the same time.

[0020] Other features and advantages of the application will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0022] Figure 1 Fig. 1 shows a top view of a photovoltaic module according to an embodiment of the present application;

[0023] Figure 2 Fig. 2 shows a cross-sectional view of a photovoltaic module according to an embodiment of the present application;

[0024] Figure 3 Fig. 3 shows a force analysis of a photovoltaic module according to an embodiment of the present application;

[0025] Figure 4 Fig. 4 shows a cross-sectional view of a corner region of a photovoltaic module according to an embodiment of the present application;

[0026] Figure 5 Fig. 5 shows a top view of a corner buffer in a corner region of a photovoltaic module according to an embodiment of the present application;

[0027] Figure 6 Fig. 6 shows a combination of a corner buffer and a backsheet according to an embodiment of the present application;

[0028] Figure 7 Fig. 7 shows another top view of a corner buffer in a corner region of a photovoltaic module according to an embodiment of the present application;

[0029] Figure 8 Fig. 8 shows another combination of a corner buffer and a backsheet according to an embodiment of the present application;

[0030] Figure 9 Fig. 9 shows a partial view of a photovoltaic module according to an embodiment of the present application;

[0031] Figure 10 Fig. 10 shows another view of a photovoltaic module according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. If desired, the detailed description

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0034] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art(s) can not be discussed in detail herein. However, where appropriate, the techniques, methods, and apparatus should be considered as being part of the specification.

[0035] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Thus, other examples of the exemplary embodiments can have different values.

[0036] Various modifications and changes can be made to the present application in matters of construction and arrangement of parts without departing from the scope of the present application as described in the claims. It is intended that the application cover all such modifications and changes as fall within the scope of the claims (the technical solutions claimed to be protected). It should be noted that the embodiments provided by the present application can be combined with each other as long as they are not contradictory.

[0037] It should be noted that similar reference numerals and letters refer to like items in the several views of the drawings, and that, as such, a discussion of the items shall not be repeated in subsequent views. It is to be expressly understood that such items are being discussed as they are defined in an earlier drawing figure.

[0038] In the related art, a photovoltaic module is laminated by stacking a back plate, an adhesive film, a cell layer, and a tempered glass layer together, and then is framed after lamination. For a single-glass module, only one side is provided with tempered glass, and the other side is provided with a flexible back plate. The flexible back plate has poor compression resistance, and in the process of transportation, verification test, and installation of a power station, if the flexible back plate part collides with other parts, cell piece breakage and black pieces are likely to occur, and the black pieces are mostly located in the corner area, which causes low power and reduced reliability of the module, and in severe cases, causes the module to be scrapped, resulting in great waste.

[0039] To this end, the present application provides a photovoltaic module to solve the above technical problems. The photovoltaic module of the present application will be described below in combination with the drawings and specific embodiments.

[0040] Figure 1 Fig. 1 shows a top view of a photovoltaic module provided by an embodiment of the present application, Figure 2 Fig. 2 shows a film layer structure diagram of a photovoltaic module provided by an embodiment of the present application. Please refer to Figures 1-2 The present application provides a photovoltaic module 100, which comprises a back plate 10, a first adhesive film 21, a cell layer 30, a second adhesive film 22, and a front plate 40 stacked along the thickness direction of the photovoltaic module, wherein the first adhesive film 21 and the second adhesive film 22 are respectively located on both sides of the cell layer 30, the back plate 10 is located on the side of the first adhesive film 21 away from the cell layer 30, and the front plate 40 is located on the side of the second adhesive film 22 away from the cell layer 30.

[0041] The photovoltaic module further comprises a buffer layer 50, which is located between the backboard 10 and the first adhesive film 21; the backboard 10 is in a rectangular structure, and the backboard 10 comprises four corner regions Q; the buffer layer 50 comprises buffer strips (for example, the first buffer strip 51 and the second buffer strip 52 are taken as examples for illustration), and the buffer strips are located at least in the corner regions Q and the central region of the photovoltaic module. Figure 1 The buffer strips are located at least in the corner regions Q and the central region of the photovoltaic module.

[0042] Optionally, the front plate 40 can be made of an organic material or an inorganic material; when the organic material is used, the organic material can be, for example, any one of ETFE, fluorocarbon resin, PVF, and PVDF; when the inorganic material is used, the inorganic material can be, for example, glass, such as tempered glass.

[0043] Specifically, in the photovoltaic module provided by the embodiment of the present application, the first adhesive film 21, the cell layer 30, the second adhesive film 22, and the front plate 40 are arranged on the same side surface of the backboard 10, wherein the first adhesive film 21 and the second adhesive film 22 are respectively located on the two sides of the cell layer 30, so as to fix the cell layer 30 and the backboard 10 and fix the cell layer 30 and the front plate 40; optionally, the backboard 10 is a flexible backboard, and the cell layer 30 comprises a plurality of cell pieces arranged in an array and electrically connected; the photovoltaic module provided by the embodiment of the present application is in a rectangular structure, and the corresponding backboard 10 is also in a rectangular structure; the four corner regions Q of the rectangular structure are the corner regions Q mentioned in the embodiment of the present application.

[0044] In view of the poor compression resistance of the backboard 10, the embodiment of the present application introduces the buffer layer 50 between the backboard 10 and the first adhesive film 21, and the buffer layer 50 is provided with buffer strips, and the buffer strips are arranged at least in the corner regions Q and the central region of the photovoltaic module. When the photovoltaic module is jolted during transportation, verification testing, installation of a power station, or collides with external objects and is compressed, the corner regions Q and the central region of the photovoltaic module are most likely to have the problem of cell piece breakage or cracking; when the buffer strips are arranged at least in the corner regions Q and the central region according to the embodiment of the present application, after external force acts on the backboard 10, the external force of the backboard 10 is transmitted to the buffer strips in the corner regions Q and the central region, and the buffer strips can disperse stress, for example, please refer to Figure 3 , so as to avoid the problem that the stress acting on a certain region is too concentrated to cause the cell pieces in the region to have breakage or black pieces, thereby facilitating the improvement of the compression resistance of the photovoltaic module and the improvement of the problem of waste caused by stress damage of the photovoltaic module. Among them, Figure 3 , which is a stress analysis schematic diagram of the photovoltaic module provided by the embodiment of the present application.

[0045] Continuing to refer to Figure 1In an alternative embodiment of the present application, the buffer zone comprises a first buffer zone 51 and a second buffer zone 52, the first buffer zone 51 and the second buffer zone 52 are arranged in a cross manner, and the first buffer zone 51 and the second buffer zone 52 at least partially overlap with the diagonal lines of the rectangular structure.

[0046] To ensure that the corner area Q and the central area of the photovoltaic module are provided with corresponding buffer zones, a feasible arrangement provided by the embodiment of the present application is to introduce two buffer zones in the photovoltaic module, specifically, a first buffer zone 51 and a second buffer zone 52, the first buffer zone 51 and the second buffer zone 52 are arranged in a cross manner on the diagonal lines of the rectangular structure, the two buffer zones extend to the corner area Q of the photovoltaic module respectively, and the intersection position of the two buffer zones is located in the central area of the photovoltaic module. In this way, by introducing two buffer zones, the requirement that the corner area Q and the central area of the photovoltaic module are provided with buffer zones can be met, which is beneficial to simplify the manufacturing process when the buffer zone is introduced in the photovoltaic module, and also beneficial to improve the compression resistance of the photovoltaic module, avoid or reduce the problem of broken or black pieces of the cell in the corner area Q and the central area of the photovoltaic module, and improve the performance stability of the photovoltaic module.

[0047] It should be noted that the film layer schematic diagram provided by the embodiment of the present application is only a partial schematic diagram, and the buffer layer 50 is correspondingly embodied in the film layer schematic diagram of some areas (such as the area provided with the buffer layer), and the buffer layer 50 is not embodied in the film layer schematic diagram of other areas (such as the area not provided with the buffer layer).

[0048] Figure 4 The film layer schematic diagram of the corner area Q of the photovoltaic module provided by the embodiment of the present application is shown, and the film layer structure of the back plate 10 is refined. Please refer to Figure 1 and Figure 4 In an alternative embodiment of the present application, the first buffer zone 51 and the second buffer zone 52 extend to the corner area Q, the first buffer zone 51 and the second buffer zone 52 each comprise a corner buffer part 60 located in the corner area Q; the back plate 10 comprises a back plate adhesive film 11 arranged towards the first adhesive film 21, and the corner buffer part 60 is fixed with the back plate adhesive film 11 and the first adhesive film 21 respectively.

[0049] Specifically, the photovoltaic module provided by the embodiment of the present application is provided with a backboard adhesive film 11 on the side of the backboard 10 facing the first adhesive film 21, and the backboard adhesive film 11 is fused and fixed with the first adhesive film 21 during lamination. When the first buffer strip 51 and the second buffer strip 52 are introduced between the backboard 10 and the first adhesive film 21, the first buffer strip 51 and the second buffer strip 52 can be first fixed on the corner buffer part 60 in the corner area Q domain before lamination, so as to avoid dislocation of the first buffer strip 51 and the second buffer strip 52 during lamination. In the actual manufacturing process, the corner buffer part 60 in the corner area Q domain can be first fixed with the backboard adhesive film 11 on the backboard 10, so as to realize the fixation of the first buffer strip 51 and the second buffer strip 52, and then the backboard 10 fixed with the first buffer strip 51 and the second buffer strip 52 is laminated with other film layer structures, which is beneficial to accurately control the position of the first buffer strip 51 and the second buffer strip 52 in the photovoltaic module, and ensures that the buffer strips are arranged in the corner area Q and the central area of the photovoltaic module, so that the stress of the corner area Q and the central area can be dispersed when subjected to external force, thereby achieving the technical effect of improving the compression resistance of the photovoltaic module.

[0050] Figure 5 Fig. 4 shows a top view of the corner buffer part 60 in the corner area Q, Figure 6 Fig. 5 shows a combination of the corner buffer part 60 and the backboard 10, please refer to Figure 5 and Figure 6 , and in combination with Figure 1 and Figure 2 In an optional embodiment of the present application, the corner buffer part 60 includes a hollow K penetrating through the corner buffer part 60 along the thickness direction of the buffer strip, and at least part of the backboard adhesive film 11 and / or at least part of the first adhesive film 21 is filled in the hollow K.

[0051] It should be noted that, Figure 5 The embodiment shown only shows a scheme in which three hollow Ks are arranged on one corner buffer part 60, and the hollow Ks are in the form of circular structures, and the number, shape and arrangement of the hollow Ks actually contained on the corner buffer part 60 are not limited, in some other embodiments of the present application, the number of hollow Ks on the corner buffer part 60 can be set according to actual needs, for example, it can also be set to 1, 2 or more than 3, and the hollow K part can also be in the form of other shapes, such as square or other polygons, etc., and the present application does not limit this.

[0052] In actual manufacturing process, after the first buffer zone 51 and the second buffer zone 52 are aligned with the back plate 10, the four corner regions Q can be heated and treated by heating welding, so that the back plate adhesive film 11 is melted, and at least part of the melted back plate adhesive film 11 will be filled into the hollow K of the corner buffer part 60. After the back plate adhesive film 11 cools down, the adhesive film filled in the hollow K can fix the back plate 10, the first buffer zone 51 and the second buffer zone 52. The structure of the hollow K provided on the corner buffer part 60 of the first buffer zone 51 and the second buffer zone 52 is simple and easy to realize. In the subsequent lamination process, the back plate adhesive film 11 in the hollow K can effectively fuse with the first adhesive film 21, thereby facilitating further fixation of the first buffer zone 51 and the second buffer zone 52. It should be noted that after lamination, the back plate adhesive film 11 in the hollow K can pass through the hollow K and fuse with the first adhesive film 21, or at least part of the first adhesive film 21 can enter the hollow K and fuse with the back plate adhesive film 11 in the hollow K.

[0053] Figure 7 Fig. 6 shows another plan view of the corner buffer part 60 located in the corner region Q, Figure 8 Fig. 7 shows another combination of the corner buffer part 60 and the back plate 10, please refer to Figure 7 Fig. 8 shows another combination of the corner buffer part 60 and the back plate 10, please refer to Figure 8 Fig. 9 shows another combination of the corner buffer part 60 and the back plate 10, please refer to Figure 1 Fig. 10 shows another combination of the corner buffer part 60 and the back plate 10, please refer to Figure 2 In an optional embodiment of the present application, the side of the corner buffer part 60 facing the back plate adhesive film 11 comprises a recess C, and at least part of the back plate adhesive film 11 is filled in the recess C of the corner buffer part 60.

[0054] It should be noted that, Figure 7 The embodiments shown only show a scheme in which two recesses C are provided on one corner buffer part 60, and the recess C is in the form of a square structure, and the number, shape and arrangement of the recess C on the corner buffer part 60 are not limited. In some other embodiments of the present application, the number of recesses C on the corner buffer part 60 can be set according to actual needs, for example, it can also be set to one or more than three. Of course, the surface of the corner buffer part 60 facing the back plate 10 can also be frosted to form a plurality of recess structures arranged densely, which can also play a role in fixing the corner buffer part 60 and the back plate 10. In addition, the recess C can also be in other shapes, such as a circle or other polygons, etc., which are not limited by the present application.

[0055] In the actual manufacturing process, after the first buffer tape 51 and the second buffer tape 52 are aligned with the back plate 10, the four corner regions Q can be heated and treated by heating welding, so that the back plate adhesive film 11 is melted, and at least part of the melted back plate adhesive film 11 will fill into the recess C of the corner buffer part 60. After the back plate adhesive film 11 cools down, the adhesive film filled in the recess C can also fix the back plate 10 with the first buffer tape 51 and the second buffer tape 52. Fixing the back plate 10 with the first buffer tape 51 and the second buffer tape 52 before laminating is equivalent to positioning the first buffer tape 51 and the second buffer tape 52, avoiding the problem that the first buffer tape 51 and the second buffer tape 52 are displaced during the laminating process and cannot effectively protect the corner regions Q and the central region of the photovoltaic module. It should be noted that the recess C on the corner buffer part 60 is located on the side of the corner buffer part 60 facing the back plate 10.

[0056] In an optional embodiment of the present application, before laminating, the corner buffer part 60 and the back plate adhesive film 11 are fixed by heating and melting the back plate adhesive film 11. In this way, the first buffer tape 51 and the second buffer tape 52 are first fixed with the back plate 10 to prevent the first buffer tape 51 and the second buffer tape 52 from being displaced during the laminating process. During the laminating process, the corner buffer part 60 is fixed with the first adhesive film 21, and the first adhesive film 21 can cover the surface of the first buffer tape 51 and the second buffer tape 52 and the surface of each corner buffer part 60 facing away from the back plate 10, thereby further achieving reliable fixation of the first buffer tape 51 and the second buffer tape 52.

[0057] Figure 9 The figure shows a partial schematic view of a photovoltaic module provided by an embodiment of the present application, which illustrates the relative position relationship between the corner region Q of the back plate 10 and the cell piece adjacent to the corner region Q. Please refer to Figure 9 In an optional embodiment of the present application, the minimum distance between the corner buffer part 60 and the edge of the corner region Q of the back plate 10 is D0, where D0≥4mm±0.5mm, and the edge of the corner buffer part 60 is located in the periphery of the cell piece in the cell layer 30.

[0058] Please refer to Figure 1 , Figure 2 and Figure 9When the first buffer zone 51 and the second buffer zone 52 are introduced into the photovoltaic module, the part of the first buffer zone 51 and the second buffer zone 52 extending into the corner area Q is a corner buffer part 60, and a certain distance D0 is reserved between the edge of the corner buffer part 60 and the edge of the corner area Q of the back plate 10 on the basis of extending the edge of the corner buffer part 60 to the periphery of the cell piece in the cell layer 30, so that the end of the corner buffer part 60 can be covered by the first adhesive film 21 in the process of lamination, avoiding the possibility of exposure of the end of the corner buffer part 60 after lamination to affect the sealing performance of the photovoltaic module. Optionally, D0 is 3.5 mm, 3.8 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, etc. If D0 is less than 3.5 mm, it may cause the corner buffer part 60 to be too close to the edge of the back plate 10, affecting the covering effect of the first adhesive film 21 on the adhesive film of the corner buffer part 60. Therefore, the present application is provided with D0≥4 mm±0.5 mm, which is beneficial to improve the covering effect of the first adhesive film 21 on the end of the corner buffer part 60 and improve the sealing performance of the photovoltaic module as a whole when the buffer layer 50 is introduced into the photovoltaic module.

[0059] With reference to the foregoing Figure 1 In an optional embodiment of the present application, the back plate 10 includes a back plate hole K0 which is arranged to avoid the intersection of the first buffer zone 51 and the second buffer zone 52.

[0060] In the overlapping area of the first buffer zone 51 and the second buffer zone 52, the buffer zone has a double-layer structure; in the non-overlapping area of the first buffer zone 51 and the second buffer zone 52, the buffer zone has a single-layer structure, so that the overall thickness of the buffer zone in the overlapping area is larger. The bus bar passes through the back plate hole K0 arranged on the back plate 10, and if the intersection position of the first buffer zone 51 and the second buffer zone 52 overlaps with the back plate hole K0, the overall thickness of the overlapping area will be larger, and the difference in thickness with other areas will be more obvious, which may affect the lamination effect. In addition, when the buffer zone is made of conductive material, the contact between the buffer zone and the bus bar will also affect the electrical performance of the photovoltaic module as a whole. Therefore, the present application arranges the back plate hole K0 to avoid the intersection of the first buffer zone 51 and the second buffer zone 52 when the first buffer zone 51 and the second buffer zone 52 are introduced, which can avoid the problem of excessive local thickness of the photovoltaic module, ensure the lamination effect, and also avoid the contact between the first buffer zone 51 and the second buffer zone 52 and the bus bar, thereby being beneficial to ensuring the accuracy and stability of the electrical performance of the photovoltaic module.

[0061] With reference to the foregoing Figure 3 and Figure 1 In an optional embodiment of the present application, the thickness of the buffer zone is D1, and D1=0.2 mm±0.05 mm; the width of the buffer zone is S1, and S1=4 mm±1 mm.

[0062] When the thickness of the buffer strip is set to 0.2 mm ± 0.05 mm, the thickness of the two layers of the buffer strip in the overlapping area of the first buffer strip 51 and the second buffer strip 52 is 0.4 ± 0.1 mm, which does not exceed 0.5 mm. The stress dispersion effect of the buffer strip is related to the thickness of the buffer strip, and at the same time, the lamination reliability is also related to the thickness of the buffer strip. When the buffer strip is set to the above thickness, the stress dispersion effect of the buffer strip can be effectively improved, and the lamination effect of the photovoltaic module is not affected, and the lamination effect of the photovoltaic module is ensured.

[0063] The aesthetic degree of the photovoltaic module is related to the width of the buffer strip. The wider the buffer strip, the greater the impact on the aesthetic degree of the photovoltaic module. In the embodiment of the present application, the width of the buffer strip is set to 4 mm ± 1 mm, which will not reduce the overall aesthetic degree of the photovoltaic module. In addition, it can also ensure that the end of the first buffer strip 51 and the second buffer strip 52 can extend to the corner area Q and extend to the cell outside the corner area Q, thereby realizing the protection of the cell in the corner area Q and avoiding the problem of broken or black pieces caused by external force.

[0064] In some optional embodiments of the present application, the buffer strip is an insulating material resistant to at least 200°C; or the buffer strip is made of the same material as the bus bar.

[0065] When the buffer strip is set to an insulating material, even if the buffer strip contacts the bus bar, it will not affect the normal electrical performance of the photovoltaic module, thereby facilitating the guarantee of the overall electrical performance of the photovoltaic module. In addition, if the buffer strip is made of an insulating material, the buffer strip is required to be resistant to at least 200°C to avoid melting of the buffer strip when the buffer strip is fixed to the back plate adhesive film 11 by heating and melting. It should be noted that the temperature of heating and melting does not exceed 200°C.

[0066] When the buffer strip is set to the same material as the bus bar, there is no need to introduce new materials in the photovoltaic module, and the bus bar can be cut to the appropriate size as the buffer strip. This is conducive to simplifying the overall manufacturing process of the photovoltaic module. It should be noted that when the buffer strip is made of the same material as the bus bar, the buffer strip needs to avoid the design of the back plate hole K0 to avoid contact between the buffer strip and the bus bar, thereby improving the pressure resistance of the photovoltaic module while facilitating the guarantee of the overall electrical performance of the photovoltaic module.

[0067] The above embodiment shows a scheme of introducing a buffer strip in the corner area Q and the center area of the photovoltaic module to protect the cells in the corner area Q and the center area, and avoid the problem of stress concentration in these areas to cause broken or black pieces of the corresponding cells. In some other embodiments of the present application, a buffer strip can also be introduced in the edge area of the photovoltaic module, for example, please refer to Figure 10 , Figure 10Another structural schematic diagram of the photovoltaic module provided by the embodiment of the present application is shown, the buffer zone comprises the edge buffer zone 53 in addition to the first buffer zone 51 and the second buffer zone 52 arranged in cross. The edge buffer zone 53 is located at the four edges of the photovoltaic module and covers at least part of the cell pieces in the edge region. The cell pieces in the edge region can be protected by the edge buffer zone 53, and the risk of the cell pieces in the edge region being broken or blackened is reduced. It should be noted that the fixing mode and other parameters of the edge buffer zone 53 and the back plate 10 can refer to the embodiments of the first buffer zone 51 and the second buffer zone 52 in the above embodiment, and the present application will not be described here.

[0068] It can be known from the above embodiments that the photovoltaic module provided by the present application at least achieves the following beneficial effects:

[0069] In the photovoltaic module provided by the present application, in addition to the back plate, the first adhesive film, the cell layer, the second adhesive film and the front plate arranged in layers, a buffer layer is introduced between the back plate and the first adhesive film. For the back plate of a rectangular structure, it has four corner regions, and the buffer zone in the buffer layer is at least located in the four corner regions and the central region of the photovoltaic module. Considering that the cell pieces are prone to be broken or blackened at the four corner positions and the central position of the photovoltaic module when the photovoltaic module is subjected to external force, the buffer zone is at least arranged in the corner region of the back plate of the photovoltaic module and the central region of the photovoltaic module. When subjected to external force, the buffer zone can disperse the external force and avoid the external force being concentrated at a certain position of the photovoltaic module, thereby reducing the possibility of the cell layer in the photovoltaic module being broken or blackened and avoiding the waste of product cost.

[0070] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises a back plate, a first adhesive film, a cell layer, a second adhesive film and a front plate which are stacked along the thickness direction of the photovoltaic module, wherein the first adhesive film and the second adhesive film are respectively located on the two sides of the cell layer, the back plate is located on the side of the first adhesive film away from the cell layer, and the front plate is located on the side of the second adhesive film away from the cell layer. The photovoltaic module further comprises a buffer layer which is located between the back plate and the first adhesive film; the back plate is in a rectangular structure, and the back plate comprises four corner regions; the buffer layer comprises a buffer strip which is located at least in the corner regions and a central region of the photovoltaic module. The buffer strip comprises a corner buffer portion located in the corner regions, and the corner buffer portion is used for pre-fixing the buffer strip before lamination of the photovoltaic module. The back plate comprises a back plate adhesive film which is arranged towards the first adhesive film, and the back plate adhesive film and / or at least part of the first adhesive film is filled in the corner buffer portion.

2. The photovoltaic module of claim 1, wherein, The buffer strip comprises a first buffer strip and a second buffer strip which are arranged in a cross manner, and the first buffer strip and the second buffer strip at least partially overlap with the diagonal lines of the rectangular structure.

3. The photovoltaic module of claim 2, wherein, The first buffer strip and the second buffer strip respectively extend to the corner regions, and the first buffer strip and the second buffer strip both comprise the corner buffer portion located in the corner regions. The corner buffer portion is fixed with the back plate adhesive film and the first adhesive film respectively.

4. The photovoltaic module of claim 3, wherein, The corner buffer portion comprises a hollow portion which penetrates through the corner buffer portion along the thickness direction of the buffer strip, and at least part of the back plate adhesive film and / or at least part of the first adhesive film is filled in the hollow portion.

5. The photovoltaic module of claim 3, wherein, The side of the corner buffer portion towards the back plate adhesive film comprises a recessed portion, and at least part of the back plate adhesive film is filled in the recessed portion.

6. The photovoltaic module according to claim 4 or 5, characterized in that The corner buffer portion and the back plate adhesive film are fixed by heating and melting the back plate adhesive film; during lamination, the corner buffer portion is fixed with the first adhesive film.

7. The photovoltaic module of claim 3, wherein, The minimum distance between the corner buffer portion and the edge of the corner region of the back plate is D0, wherein D0≥4mm±0.5mm, and the edge of the corner buffer portion is located outside the cell piece in the cell layer.

8. The photovoltaic module of claim 2, wherein, The back plate comprises a back plate hole which is arranged to avoid the intersection of the first buffer strip and the second buffer strip.

9. The photovoltaic module of claim 1, wherein, The thickness of the buffer strip is D1, and D1=0.2mm±0.05mm; the width of the buffer strip is S1, and S1=4mm±1mm.

10. The photovoltaic module of claim 1, wherein, The photovoltaic module comprises a busbar. The buffer strip is an insulating material which is resistant to at least 200℃; or the buffer strip is made of the same material as the busbar.

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