CN117637886A - Photovoltaic modules - Google Patents

Abstract

The invention discloses a photovoltaic module, which relates to the technical field of photovoltaics and comprises a back plate, a first adhesive film, a battery layer, a second adhesive film and a front plate, wherein the back plate, the first adhesive film, the battery layer, the second adhesive film and the front plate are arranged in a stacked mode along the thickness direction of the photovoltaic module, the first adhesive film and the second adhesive film are respectively positioned at two sides of the battery layer, the back plate is positioned at one side, away from the battery layer, of the first adhesive film, and the front plate is positioned at one side, away from the battery layer, of the second adhesive film; the photovoltaic module further comprises a buffer layer, wherein the buffer layer is positioned between the back plate and the first adhesive film; the backboard is of a rectangular structure and comprises four corner areas; the buffer layer comprises a buffer zone, and the buffer zone is at least positioned in a corner area and a central area of the photovoltaic module. Through set up the buffer zone between backplate and first glued membrane to with the buffer zone at least set up in photovoltaic module's bight district and central zone, when photovoltaic module received the external force effect, the buffer zone can be with external force dispersion, thereby reduce the injury of external force to the battery layer, reduce the problem that broken piece, black piece appear in the battery piece.

Description

Photovoltaic modules

Technical field

The present invention relates to the field of photovoltaic technology, and more specifically, to a photovoltaic module.

Background technique

The backsheets of existing photovoltaic modules have poor compression resistance, especially when the flexible backsheets of single-glass modules come into contact with other objects during production, transportation or installation, or are squeezed or bumped during transportation. This leads to problems such as cracks and black chips in the battery cells inside the module. With the trend of cost reduction and battery thinning, the above-mentioned problems are more likely to occur when batteries in single-glass modules are stressed. This will result in low module power, reduced reliability, and in severe cases, the module will be scrapped, resulting in huge waste.

Contents of the invention

In view of this, the present invention provides a photovoltaic module, aiming to reduce the problem of cracks or black flakes occurring in the photovoltaic module due to stress.

The present invention provides a photovoltaic module, including a backsheet, a first adhesive film, a battery layer, a second adhesive film and a front plate that are stacked along the thickness direction of the photovoltaic module, wherein the first adhesive film and the third adhesive film The two adhesive films are located on both sides of the battery layer respectively, the back plate is located on the side of the first adhesive film facing away from the battery layer, and the front plate is located on the side of the second adhesive film facing away from the battery layer. one side;

The photovoltaic module also includes a buffer layer, the buffer layer is located between the back sheet and the first adhesive film; the back sheet is a rectangular structure, and the back sheet includes four corner areas; the buffer layer The layer includes buffer strips located at least in the corner regions and in a central region of the photovoltaic module.

Optionally, the buffer zone includes a first buffer zone and a second buffer zone, the first buffer zone and the second buffer zone are arranged crosswise, and the first buffer zone and the second buffer zone are The strips at least partially overlap the diagonals of the rectangular structure.

Optionally, the first buffer zone and the second buffer zone respectively extend to the corner area, and the first buffer zone and the second buffer zone each include a buffer zone located at the corner area. corner buffer;

The back panel includes a back panel adhesive film disposed toward the first adhesive film, and the corner buffer portions are respectively fixed to the back panel adhesive film and the first adhesive film.

Optionally, the corner buffer portion includes a hollow that runs through the corner buffer portion along the thickness direction of the buffer strip, at least part of the backboard adhesive film and/or at least part of the first adhesive film Fill the hollow space;

Optionally, a side of the corner buffer portion facing the backplate adhesive film includes a recessed portion, and at least part of the backplate adhesive film is filled in the recessed portion.

Optionally, the corner buffer portion and the backplane adhesive film are fixed by heating and melting the backplane adhesive film; during the lamination process, the corner buffer portion and the backplane adhesive film are fixed together. The first adhesive film is fixed.

Optionally, the minimum distance between the corner buffer and the edge of the corner area of the back plate is D0, where D0≥4mm±0.5mm, and the edge of the corner buffer is located The periphery of the battery sheet in the battery layer.

Optionally, the back plate includes a back plate hole, and the back plate hole is arranged to avoid the intersection point of the first buffer strip and the second buffer strip.

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

Optionally, wherein the photovoltaic component includes a bus bar;

The buffer strip is an insulating material with a temperature resistance of at least 200°C; or, the buffer strip is made of the same material as the bus bar.

Compared with the existing technology, the photovoltaic module provided by the present invention at least achieves the following beneficial effects:

In the photovoltaic module provided by the present invention, in addition to the stacked back sheet, first adhesive film, battery layer, second adhesive film and front sheet, a buffer layer is also introduced between the back sheet and the first adhesive film. For the backsheet with a rectangular structure, it has four corner areas, and the buffer strips in the buffer layer are located at least in the four corner areas and the central area of the photovoltaic module. Considering that when photovoltaic modules are subjected to external forces, cell fragments or black chips are likely to appear at the four corners and center of the photovoltaic module, the present invention sets buffer strips at least at the corner areas of the photovoltaic module backplane and the central area of the photovoltaic module. , when subjected to external force, the buffer zone can disperse the external force and prevent the external force from being concentrated at a certain location of the photovoltaic module, thereby reducing the possibility of fragmentation or black chips in the cell layer in the photovoltaic module and avoiding waste of product costs.

Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned technical effects at the same time.

Other features of the invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings.

Description of drawings

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

Figure 1 shows a top structural view of a photovoltaic module provided by an embodiment of the present invention;

Figure 2 shows a film structure diagram of a photovoltaic module provided by an embodiment of the present invention;

Figure 3 shows a schematic diagram of force analysis of the photovoltaic module provided by the embodiment of the present invention;

Figure 4 shows a schematic diagram of a film layer in the corner area of the photovoltaic module provided by an embodiment of the present invention;

Figure 5 shows a schematic structural diagram of a top view of the corner buffer portion located in the corner area;

Figure 6 shows a schematic diagram of the combination of the corner buffer part and the back plate;

Figure 7 shows another top structural schematic diagram of the corner buffer portion located in the corner area;

Figure 8 shows another schematic diagram of the combination of the corner buffer part and the back plate;

Figure 9 shows a partial schematic diagram of a photovoltaic module provided by an embodiment of the present invention;

FIG. 10 shows another structural schematic diagram of a photovoltaic module provided by an embodiment of the present invention.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these examples do not limit the scope of the invention unless otherwise specifically stated.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered a part of the specification.

In all examples shown and discussed herein, any specific values are to be construed as illustrative only and not as limiting. Accordingly, other examples of the exemplary embodiments may have different values.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the corresponding claims (claimed technical solutions) and their equivalents. It should be noted that the implementation modes provided by the embodiments of the present invention can be combined with each other if there is no contradiction.

It should be noted that similar reference numerals and letters refer to similar items in the following figures, so that once an item is defined in one figure, it does not need further discussion in subsequent figures.

When the photovoltaic modules in the related art are stacked, the backsheet, adhesive film, battery layer and tempered glass are stacked together for lamination, and then framed after the lamination is completed. For single-glass modules, only tempered glass is provided on one side, and a flexible backsheet is provided on the other side. Flexible backsheets have poor compression resistance. During the bumps during transportation, verification testing, and installation of power stations, if the flexible backsheet collides with other components, it is easy to cause problems such as broken battery cells and black chips. The location is mostly in the corner area, which will cause low component power and reduced reliability. In severe cases, the component will be scrapped, resulting in great waste.

To this end, the present invention provides a photovoltaic module to solve the above technical problems. The photovoltaic module of the present invention will be described below with reference to the drawings and specific embodiments.

FIG. 1 shows a top structural view of a photovoltaic module provided by an embodiment of the present invention, and FIG. 2 shows a film structure diagram of a photovoltaic module provided by an embodiment of the present invention. Please refer to Figures 1 to 2. The present invention provides a photovoltaic module 100, which includes a backsheet 10, a first adhesive film 21, a battery layer 30, a second adhesive film 22 and a front plate 40 that are stacked along the thickness direction of the photovoltaic module. Among them, the first adhesive film 21 and the second adhesive film 22 are respectively located on both sides of the battery layer 30, the back plate 10 is located on the side of the first adhesive film 21 facing away from the battery layer 30, and the front plate 40 is located on the side of the second adhesive film 22 facing away from the battery. One side of layer 30;

The photovoltaic module also includes a buffer layer 50, which is located between the back plate 10 and the first adhesive film 21; the back plate 10 has a rectangular structure, and the back plate 10 includes four corner areas Q; the buffer layer 50 includes buffer strips (Fig. 1 Taking the first buffer zone 51 and the second buffer zone 52 as an example for explanation), the buffer zone is located at least in the corner area Q and the central area of the photovoltaic module.

Optionally, the front plate 40 can be made of organic materials or inorganic materials. When it is made of organic materials, the organic material can be any one of ETFE, fluorocarbon resin, PVF, and PVDF; when it is made of inorganic materials, Examples of inorganic materials include glass, such as tempered glass.

Specifically, in the photovoltaic module provided by the embodiment of the present invention, a first adhesive film 21, a battery layer 30, a second adhesive film 22 and a front plate 40 are provided on the same side surface of the backsheet 10, where the first adhesive film The film 21 and the second adhesive film 22 are respectively located on both sides of the battery layer 30 and are used to achieve fixation between the battery layer 30 and the back plate 10 and between the battery layer 30 and the front plate 40 . Optionally, the back plate 10 It is a flexible backplane. The battery layer 30 includes a plurality of battery cells arranged in an array and electrically connected. The photovoltaic module provided by the embodiment of the present invention has a rectangular structure, and the corresponding backplane 10 also has a rectangular structure. The four corners of the rectangular structure The corner region Q is the corner region Q mentioned in the embodiment of the present invention.

Considering the problem of poor pressure resistance of the backsheet 10, the embodiment of the present invention introduces a buffer layer 50 between the backsheet 10 and the first adhesive film 21. The buffer layer 50 is provided with a buffer strip, at least in the corner area of the photovoltaic module. There is a buffer zone between Q and the central area. When photovoltaic modules collide with foreign objects and are stressed during transportation, verification testing, power station installation, etc., the corner area Q and center area of the photovoltaic module are most likely to have the problem of cell fragments or splinters. When the present invention In the embodiment, when the buffer zone is provided at least in the corner area Q and the center area, after the external force acts on the back plate 10, the external force of the back plate 10 is transmitted to the buffer zone in the corner area Q and the center area, and the buffer zone can disperse the stress. , for example, please refer to Figure 3, so as to avoid excessive concentration of stress on a certain area and causing the problem of broken or black chips in the cells in that area, which will help improve the pressure resistance of photovoltaic modules and improve the stress damage of photovoltaic modules. And cause the problem of waste. Among them, FIG. 3 shows a force analysis schematic diagram of the photovoltaic module provided by the embodiment of the present invention.

Continuing to refer to Figure 1, in an optional embodiment of the present invention, the buffer zone includes a first buffer zone 51 and a second buffer zone 52. The first buffer zone 51 and the second buffer zone 52 are arranged crosswise, and the first buffer zone 51 and the second buffer zone 52 are interleaved. The strip 51 and the second buffer strip 52 at least partially overlap the diagonals of the rectangular structure.

In order to ensure that the corner area Q and the center area of the photovoltaic module are equipped with corresponding buffer strips, a feasible arrangement method provided by the embodiment of the present invention is to introduce two buffer strips into the photovoltaic module, specifically the first buffer strip. 51 and the second buffer strip 52. The first buffer strip 51 and the second buffer strip 52 are intersected on the diagonal lines of the rectangular structure. The two buffer strips extend to the corner area Q of the photovoltaic module respectively. The intersection of the two buffer strips It is located in the center of the photovoltaic module. In this way, by introducing two buffer strips, the requirement that both the corner area Q and the central area of the photovoltaic module be provided with buffer strips can be met, which is conducive to simplifying the manufacturing process when introducing buffer strips into the photovoltaic module, and is also conducive to improving the photovoltaic The pressure resistance of the module can avoid or reduce the problem of chipping or black chips in the corner area Q and the center area of the photovoltaic module, which is beneficial to improving the performance stability of the photovoltaic module.

It should be noted that the schematic diagram of the film layer provided by the embodiment of the present invention is only a partial schematic diagram. The buffer layer 50 is correspondingly reflected in the schematic diagram of the film layer in some areas (such as the area where the buffer layer is provided), while in other areas (such as the area where the buffer layer is provided) The buffer layer 50 is not reflected in the schematic diagram of the film layer (area where the buffer layer is not provided).

FIG. 4 shows a schematic diagram of a film layer in the corner region Q of the photovoltaic module provided by an embodiment of the present invention. This embodiment refines the film layer structure of the backsheet 10 . Please refer to Figures 1 and 4. In an optional embodiment of the present invention, the first buffer zone 51 and the second buffer zone 52 extend to the corner area Q respectively. The first buffer zone 51 and the second buffer zone 52 Both include a corner buffer portion 60 located in the corner area Q; the back plate 10 includes a back plate adhesive film 11 disposed toward the first adhesive film 21, and the corner buffer portions 60 are respectively connected with the back plate adhesive film 11 and the first adhesive film 21 fixed.

Specifically, in the photovoltaic module provided by the embodiment of the present invention, the backsheet adhesive film 11 is provided on the side of the backsheet 10 facing the first adhesive film 21. During lamination, the backsheet adhesive film 11 and the first adhesive film 21 Fusion fixed. When the first buffer tape 51 and the second buffer tape 52 are introduced between the back plate 10 and the first adhesive film 21, the first buffer tape 51 and the second buffer tape 52 can first be located at the corners of the corner area Q. The buffer portion 60 is fixed before being laminated to avoid misalignment of the first buffer strip 51 and the second buffer strip 52 during the lamination process. In the actual manufacturing process, the corner buffer portion 60 located in the corner area Q can be first fixed to the backplane adhesive film 11 on the backplane 10, thereby achieving the fixation of the first buffer strip 51 and the second buffer strip 52. Then, the backsheet 10 with the first buffer strip 51 and the second buffer strip 52 fixed is laminated with other film structures, which is conducive to accurately controlling the position of the first buffer strip 51 and the second buffer strip 52 in the photovoltaic module. position to ensure that there are corresponding buffer zones in the corner area Q and the center area of the photovoltaic module. When subjected to external force, the stress in the corner area Q and the center area can be dispersed, thereby achieving the technology of improving the pressure resistance of the photovoltaic module. Effect.

Figure 5 shows a schematic top view of the corner buffer portion 60 located in the corner area Q. Figure 6 shows a schematic diagram of the combination of the corner buffer portion 60 and the back plate 10. Please refer to Figures 5 and 6 , and with reference to Figures 1 and 2, in an optional embodiment of the present invention, the corner buffer portion 60 includes a hollow K that penetrates the corner buffer portion 60 along the thickness direction of the buffer strip, and at least part of the backplane adhesive film 11 And/or at least part of the first adhesive film 21 is filled in the hollow K.

It should be noted that the embodiment shown in FIG. 5 only shows a solution in which three hollows K are provided on one corner buffer portion 60 and the hollow K is embodied as a circular structure, and does not illustrate the actual structure of the corner buffer portion 60 . The number, shape and arrangement of the hollow K's are limited. In some other embodiments of the present invention, the number of the hollow K's on the corner buffer part 60 can be set according to actual needs, for example, it can also be set to 1 or 2. Or more than 3, the hollow K part can also be embodied in other shapes, such as square or other polygons, etc., which is not limited by the present invention.

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 areas Q can be heated by heating and welding, so that the back plate adhesive film 11 Melt, and at least part of the melted backplane adhesive film 11 will be filled into the hollow K of the corner buffer portion 60. After the backplane adhesive film 11 cools, the adhesive film filled in the hollow K will be able to realize the connection between the backplane 10 and the first The fixation of the buffer strip 51 and the second buffer strip 52 is provided with a structure of hollow K on the corner buffer portion 60 of the first buffer strip 51 and the second buffer strip 52, which is simple in design and easy to implement. During the subsequent lamination process, the backplane adhesive film 11 and the first adhesive film 21 located in the hollow K can be effectively fused, thereby facilitating further fixation of the first buffer tape 51 and the second buffer tape 52 . It should be noted that after lamination, the backboard adhesive film 11 in the air may pass through the hollow K and merge with the first adhesive film 21, or at least part of the first adhesive film 21 may enter the hollow K and merge with the hollow K. The backplane adhesive film 11 is fused.

Figure 7 shows another schematic structural diagram of the corner buffer 60 located in the corner area Q. Figure 8 shows another schematic diagram of the combination of the corner buffer 60 and the back plate 10. Please refer to Figures 7 and 8, combined with FIGS. 1 and 2, in an optional embodiment of the present invention, the corner buffer portion 60 includes a recessed portion C on the side facing the backplane adhesive film 11, which is at least partially filled with the backplane adhesive film 11. in the recessed portion C of the corner buffer portion 60 .

It should be noted that the embodiment shown in FIG. 7 only shows a solution in which two recessed portions C are provided on one corner buffer portion 60 and the recessed portions C are embodied in a square structure, and does not illustrate the actual structure of the corner buffer portion 60 . The number, shape and arrangement of the included recessed portions C are limited. In some other embodiments of the present invention, the number of recessed portions C on the corner buffer portion 60 can be set according to actual needs, for example, it can also be set to 1 or 3 or more. Of course, the surface of the corner buffers 60 facing the back plate 10 can also be frosted to form a plurality of densely arranged recessed structures, which can also exert the interaction between the corner buffers 60 and the back plate 10 . Fixed function; in addition, the recessed portion C can also be embodied in other shapes, such as circles or other polygons, etc., which is not limited by the present invention.

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 areas Q can be heated by heating and welding, so that the back plate adhesive film 11 Melt, and at least part of the melted backplane adhesive film 11 will be filled into the recessed portion C of the corner buffer portion 60. After the backplane adhesive film 11 cools, the adhesive film filled in the recessed portion C can also realize the backplate 10 and The first buffer belt 51 and the second buffer belt 52 are fixed. Before lamination, the backing plate 10 and the first buffer belt 51 and the second buffer belt 52 are fixed, which is equivalent to positioning the first buffer belt 51 and the second buffer belt 52 to avoid the first buffering during the lamination process. There is a problem that the belt 51 and the second buffer belt 52 are displaced and it is difficult to effectively protect the corner area Q and the center area of the photovoltaic module. It should be noted that the recessed portion C on the corner buffer portion 60 is located on the side of the corner buffer portion 60 facing the back plate 10 .

In an optional embodiment of the present invention, before lamination, the corner buffer portion 60 and the backplane adhesive film 11 are fixed by heating and melting the backplane adhesive film 11, so that the first buffer tape is first 51 and the second buffer belt 52 are fixed to the back plate 10 to prevent the first buffer belt 51 and the second buffer belt 52 from being displaced during the lamination process. During the lamination process, the corner buffer portion 60 is fixed to the first adhesive film 21, and the first adhesive film 21 can separate the first buffer strip 51, the second buffer strip 52 and the corresponding corner buffer portions 60 from each other. The surface and sides of the board 10 are covered, thereby further achieving reliable fixing of the first buffer strip 51 and the second buffer strip 52 .

FIG. 9 is a partial schematic diagram of a photovoltaic module provided by an embodiment of the present invention, illustrating a relative positional relationship between the corner area Q of the backsheet 10 and the cells adjacent to the corner area Q. Please refer to FIG. 9 . In an optional embodiment of the present invention, the minimum distance between the corner buffer 60 and the edge of the corner area Q of the back plate 10 is D0, where D0≥4mm±0.5mm, And the edge of the corner buffer portion 60 is located at the periphery of the battery sheet in the battery layer 30 .

Please combine Figure 1, Figure 2 and Figure 9. When the first buffer zone 51 and the second buffer zone 52 are introduced into the photovoltaic module, the portion of the first buffer zone 51 and the second buffer zone 52 extending to the corner area Q is The corner buffer portion 60 extends the edge of the corner buffer portion 60 to the periphery of the battery sheet in the battery layer 30 , and predetermines a gap between the corner buffer portion 60 and the edge of the corner region Q of the back plate 10 . Leave a certain distance D0 so that the end of the corner buffer 60 will be covered by the first adhesive film 21 during the lamination process to prevent the end of the corner buffer 60 from being exposed after lamination and affecting the photovoltaic Sealing performance of components. Alternatively, D0 is 3.5mm, 3.8mm, 4mm, 4.5mm, 5mm, 5.5mm, etc. If D0 is less than 3.5 mm, the corner buffer portion 60 may be too close to the edge of the back plate 10 , affecting the coating effect of the first adhesive film 21 on the corner buffer portion 60 . Therefore, the present invention is set to D0 When ≥4mm±0.5mm, it is helpful to improve the coating effect of the first adhesive film 21 on the end of the corner buffer portion 60 and to improve the overall sealing performance of the photovoltaic module when the buffer layer 50 is introduced into the photovoltaic module.

Continuing to refer to FIG. 1 , in an optional embodiment of the present invention, the back plate 10 includes a back plate hole K0 , and the back plate hole K0 is arranged to avoid the intersection of the first buffer strip 51 and the second buffer strip 52 .

In the area where the first buffer zone 51 and the second buffer zone 52 overlap, the buffer zone has a double-layer structure; in the area where the first buffer zone 51 and the second buffer zone 52 do not overlap, the buffer zone has a single-layer structure. Therefore, , in the overlapping area, the overall thickness of the buffer zone is larger. The back plate hole K0 is provided on the back plate 10 and a bus bar passes through it. If the intersection position of the first buffer strip 51 and the second buffer strip 52 overlaps with the back plate hole K0, the overall thickness of the overlapping area will be thicker. Large, the thickness difference from other areas is obvious, which may affect the lamination effect. In addition, when the buffer strip is made of conductive material, the contact between the buffer strip and the bus bar will also affect the overall electrical performance of the photovoltaic module. Therefore, when the first buffer strip 51 and the second buffer strip 52 are introduced in the embodiment of the present invention, the back plate hole K0 is arranged to avoid the intersection point of the first buffer strip 51 and the second buffer strip 52, which can avoid localization of the photovoltaic module. The problem of excessive thickness ensures the effect of subsequent lamination, and also prevents the first buffer strip 51 and the second buffer strip 52 from coming into contact with the bus bar, thus ensuring the accuracy and stability of the electrical performance of the photovoltaic module.

Please refer to Figures 3 and 1. In an optional embodiment of the present invention, the thickness of the buffer strip is D1, D1=0.2mm±0.05mm; the width of the buffer strip is S1, S1=4mm±1mm.

When the thickness of the buffer strip is set to 0.2 mm ± 0.05 mm in the present invention, the thickness of the two buffer strips in the area where the first buffer strip 51 and the second buffer strip 52 overlap will be 0.4 ± 0.1 mm, not exceeding 0.5 mm. The stress dispersion effect of the buffer strip is related to the thickness of the buffer strip. 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, it can not only effectively improve the stress dispersion effect of the buffer strip, but also It will not affect the lamination effect of photovoltaic modules and ensure the lamination effect of photovoltaic modules.

The aesthetics of photovoltaic modules is related to the width of the buffer zone. The greater the width of the buffer zone, the more it affects the aesthetics of photovoltaic modules. In the embodiment of the present invention, when the width of the buffer strip is set to 4 mm ± 1 mm, the overall aesthetics of the photovoltaic module will not be reduced. In addition, it can also ensure that the ends of the first buffer strip 51 and the second buffer strip 52 can extend to the corners. Area Q and extends beyond the battery cells in the corner area Q, thereby protecting the battery cells in the corner area Q and avoiding the problem of fragmentation or black chips caused by external forces.

In some optional embodiments of the present invention, the buffer strip is an insulating material with a temperature resistance of at least 200°C; or, the buffer strip is made of the same material as the bus bar.

When the buffer strip is made of insulating material, even if the buffer strip comes into contact with the bus bar, it will not affect the normal electrical performance of the photovoltaic module, thus ensuring the overall electrical performance of the photovoltaic module. In addition, if the buffer tape is made of insulating material, the buffer tape is required to withstand a temperature of at least 200°C to prevent the buffer tape from melting when the buffer tape and the backing film 11 are fixed by heating and melting. It should be noted that heating and melting The temperature will not exceed 200℃.

When the buffer strip is made of the same material as the bus bar, there is no need to introduce new materials into the photovoltaic module. The bus bar can be cut to a suitable size as a buffer strip, which helps simplify 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 backplate hole K0 design to avoid contact between the buffer strip and the bus bar, thereby improving the pressure resistance of the photovoltaic module while also It is helpful to ensure the overall electrical performance of photovoltaic modules.

The above embodiment shows the solution of introducing buffer strips 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, resulting in corresponding The battery chip is broken or black. In some other embodiments of the present invention, a buffer zone can also be introduced in the edge area of the photovoltaic module. For example, please refer to Figure 10. Figure 10 shows another structural schematic diagram of a photovoltaic module provided by an embodiment of the present invention. The buffer zone In addition to the first buffer strip 51 and the second buffer strip 52 arranged crosswise, the strip also includes an edge buffer strip 53 located in the edge area. The edge buffer strip 53 is located at the four edges of the photovoltaic module and covers at least part of the edge area. For battery sheets, the edge buffer strip 53 can protect the battery sheets in the edge area, thereby reducing the risk of broken or black chips occurring in the battery sheets in the edge area. It should be noted that the fixing method of the edge buffer strip 53 to the back plate 10 and other parameters may refer to the embodiments of the first buffer strip 51 and the second buffer strip 52 in the above embodiments, and will not be described again in the present invention.

It can be seen from the above embodiments that the photovoltaic module provided by the present invention at least achieves the following beneficial effects:

In the photovoltaic module provided by the present invention, in addition to the stacked back sheet, first adhesive film, battery layer, second adhesive film and front sheet, a buffer layer is also introduced between the back sheet and the first adhesive film. For the backsheet with a rectangular structure, it has four corner areas, and the buffer strips in the buffer layer are located at least in the four corner areas and the central area of the photovoltaic module. Considering that when photovoltaic modules are subjected to external forces, cell fragments or black chips are likely to appear at the four corners and center of the photovoltaic module, the present invention sets buffer strips at least at the corner areas of the photovoltaic module backplane and the central area of the photovoltaic module. , when subjected to external force, the buffer zone can disperse the external force and prevent the external force from being concentrated at a certain location of the photovoltaic module, thereby reducing the possibility of fragmentation or black chips in the cell layer in the photovoltaic module and avoiding waste of product costs.

Although some specific embodiments of the invention have been described in detail by way of examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the invention. Those skilled in the art will understand that the above embodiments can be modified without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. The photovoltaic module is characterized by comprising a back plate, a first adhesive film, a battery layer, a second adhesive film and a front plate which are arranged in a stacked manner along the thickness direction of the photovoltaic module, wherein the first adhesive film and the second adhesive film are respectively positioned at two sides of the battery layer, the back plate is positioned at one side of the first adhesive film, which is away from the battery layer, and the front plate is positioned at one side of the second adhesive film, which is away from the battery layer;

the photovoltaic module further comprises a buffer layer, wherein the buffer layer is positioned between the back plate and the first adhesive film; the backboard is of a rectangular structure and comprises four corner areas; the buffer layer comprises a buffer belt, and the buffer belt is at least positioned in the corner area and the central area of the photovoltaic module.

2. The photovoltaic assembly of claim 1, wherein the buffer strips comprise a first buffer strip and a second buffer strip, the first buffer strip and the second buffer strip are disposed crosswise, and the first buffer strip and the second buffer strip at least partially overlap a diagonal of the rectangular structure.

3. The photovoltaic assembly of claim 2, wherein the first and second buffer strips each extend to the corner region, the first and second buffer strips each including a corner buffer located at the corner region;

the back plate comprises a back plate adhesive film arranged towards the first adhesive film, and the corner buffer parts are respectively fixed with the back plate adhesive film and the first adhesive film.

4. A photovoltaic module according to claim 3, wherein the corner buffer comprises a hollow extending through the corner buffer in the thickness direction of the buffer tape, at least part of the backsheet adhesive film and/or at least part of the first adhesive film being filled in the hollow.

5. The photovoltaic module of claim 3, wherein a side of the corner buffer facing the backsheet adhesive film includes a recess, at least a portion of the backsheet adhesive film filling the recess.

6. The photovoltaic module according to claim 4 or 5, wherein the corner buffer and the backsheet adhesive film are fixed by heating and melting the backsheet adhesive film; in the lamination process, the corner buffer part is fixed with the first adhesive film.

7. The photovoltaic module of claim 3, wherein a minimum distance between the corner buffers and edges of corner regions of the backsheet is D0, wherein D0 is.

8. The photovoltaic assembly of claim 2, wherein the backsheet comprises a backsheet aperture, the backsheet Kong Birang being disposed at the intersection of the first and second buffer strips.

9. The photovoltaic module of claim 1, wherein the thickness of the buffer tape is D1, d1=0.2 mm±0.05mm; the width of the buffer belt is S1, s1=4mm±1mm.

10. The photovoltaic assembly of claim 1, wherein the photovoltaic assembly comprises a bus bar;

the buffer belt is made of an insulating material with the temperature resistance of at least 200 ℃; alternatively, the buffer tape is the same material as the bus bar.