Photovoltaic laminated piece and photovoltaic module

Abstract

The utility model provides a photovoltaic laminated member and a photovoltaic assembly, relates to the field of photovoltaic technology, and aims to solve the technical problem of poor reliability of the photovoltaic laminated member. The photovoltaic laminated piece comprises a cover plate, a first adhesive film, a battery piece array, a first grid structure, a second adhesive film and a back plate which are stacked in sequence, and battery pieces of the battery piece array are arranged at intervals; the first grid structure is formed by a plurality of first strips, and the plurality of first strips are formed by weaving first fibers; the orthographic projections of the plurality of first strips on the cell array at least cover other areas of the cell array except the cells. According to the photovoltaic laminated piece, weak parts of the adhesive film, such as piece gaps and string gaps of the battery piece array and the circumferential edge of the battery piece array, are reinforced by the first fibers, so that the risk of aging failure of the photovoltaic laminated piece is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, and in particular to a photovoltaic laminate and a photovoltaic module. Background Art

[0002] The statements in this part only provide the background art related to the utility model, and do not necessarily constitute the prior art.

[0003] A photovoltaic laminate generally includes an array of photovoltaic cells, and a cover plate and a back plate laminated on both sides of the photovoltaic cell array through corresponding adhesive films respectively. Considering the production cost, the thickness of the adhesive film in the photovoltaic laminate needs to be thinned. The photovoltaic cell array forms a battery string by a plurality of cells arranged at intervals, and each battery string is also arranged at intervals. When the thickness of the adhesive film at the inter-cell and inter-string positions of the photovoltaic cell array is insufficient, the connection strength at this position is insufficient, and in actual use, the photovoltaic laminate is prone to failure. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a photovoltaic laminate and a photovoltaic module to solve the technical problem of poor reliability of the photovoltaic laminate.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a photovoltaic laminate, which includes a cover plate, a first adhesive film, a battery cell array, a first grid structure, a second adhesive film and a back plate laminated in sequence, and the battery cells of the battery cell array are arranged at intervals;

[0007] The first grid structure is formed by a plurality of first strip bands, and the plurality of first strip bands are woven from first fibers;

[0008] The orthographic projection of the plurality of first strip bands on the battery cell array at least covers other areas of the battery cell array except the battery cells.

[0009] According to at least one embodiment of the utility model, the battery cells of the battery cell array correspond to the first grids of the first grid structure one by one;

[0010] The orthographic projection of the first strip bands forming the same first grid on the battery cell array overlaps with the circumferential edge part of the corresponding battery cell.

[0011] According to at least one embodiment of the utility model, the first grid structure further includes a sub-grid structure formed in each first grid, the sub-grid structure is formed by a plurality of sub-strip bands, and the plurality of sub-strip bands are woven from first fibers.

[0012] According to at least one embodiment of the present invention, the color of the first fibers includes black or white.

[0013] According to at least one embodiment of the present invention, the cross-section of the first fiber is circular or trapezoidal.

[0014] According to at least one embodiment of the present invention, the thickness of the first strip and the first sub-strip are in the range of 0.05 mm to 0.3 mm respectively.

[0015] According to at least one embodiment of the present invention, the photovoltaic laminate further includes a second grid structure stacked between the first adhesive film and the cell array, wherein the second grid structure is formed by a plurality of second strips, and the plurality of second strips are woven from second fibers;

[0016] The orthographic projections of the plurality of second strips on the battery cell array at least cover other areas of the battery cell array except the battery cells.

[0017] According to at least one embodiment of the present invention, the thickness of the second strip ranges from 0.05 mm to 0.3 mm.

[0018] According to at least one embodiment of the present invention, the second fiber is a light-transmitting fiber.

[0019] According to at least one embodiment of the present invention, the cross-section of the second fiber is circular or trapezoidal.

[0020] In a second aspect, the present invention provides a photovoltaic assembly comprising the photovoltaic laminate described in the first aspect.

[0021] One or more technical solutions provided in the exemplary embodiments of the present invention can achieve at least one of the following beneficial effects.

[0022] The photovoltaic laminate of the exemplary embodiment of the present invention includes a sequentially stacked cover plate, a first adhesive film, a cell array, a first grid structure, a second adhesive film, and a backsheet. The first grid structure is comprised of a plurality of first strips woven from first fibers, interlaced to form a plurality of first grids. The orthographic projections of each first strip on the cell array cover the interslice gaps, interslice gaps between strings, and the circumferential edges of the cell array. When the second adhesive film melts, a composite adhesive film reinforced with the first fibers is formed over the interslice gaps, interslice gaps between strings, and the circumferential edges of the cell array. Consequently, the first fibers reinforce the film at weak points, such as the interslice gaps, interslice gaps between strings, and the circumferential edges of the cell array, reducing the risk of aging and failure of the photovoltaic laminate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings illustrate exemplary embodiments of the present utility model and, together with their descriptions, are used to explain the principles of the present utility model. These accompanying drawings are included to provide a further understanding of the present utility model and are included in this specification and form a part of this specification;

[0024] Figure 1 is a top - view structural schematic diagram of a cell array according to an embodiment of the present utility model;

[0025] Figure 2 is an axonometric structural schematic diagram of a photovoltaic laminate according to an embodiment of the present utility model;

[0026] Figure 3 is an axonometric structural schematic diagram of a photovoltaic laminate according to another embodiment of the present utility model;

[0027] Figure 4 is an axonometric structural schematic diagram of a photovoltaic laminate according to yet another embodiment of the present utility model;

[0028] Figure 5 is a top - view structural schematic diagram of a second grid structure according to an embodiment of the present utility model;

[0029] Figure 6 is a top - view structural schematic diagram of a first grid structure according to an embodiment of the present utility model;

[0030] Figure 7 is a partial enlarged structural schematic diagram of a strip according to an embodiment of the present utility model.

[0031] Reference numerals: 10, cell array; 11, cell; 111, cell gap; 112, string gap; 21, first carrier film; 22, second carrier film; 31, first grid structure; 311, first strip A part; 312, first strip B part; 313, first strip C part; 32, second grid structure; 321, second strip A part; 322, second strip B part; 323, second strip C part; 41, first adhesive film; 42, second adhesive film; 50, cover plate; 60, back plate; 70, sub - grid structure; 71, first sub - strip; 72, second sub - strip. Detailed Embodiments

[0032] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] The photovoltaic laminate provided by the exemplary embodiment of the present invention is composed of strips woven from fibers, which are staggered to form a grid structure. Each strip matches the cell gap, string gap and circumferential edge area on the cell array, and the grid structure is arranged between the photovoltaic cell array and the packaging film on the back. When the laminate is formed, the grid structure can strengthen the packaging film located in the cell gap, string gap and circumferential edge area, and can increase the reliability of the photovoltaic laminate during use.

[0034] Figure 1 Schematic diagram of the top view of the battery array according to the embodiment of the present invention. Figure 1 As shown, the battery cell array 10 of the exemplary embodiment of the present invention includes a battery string (for example, Figure 1 The ten cells 11 in the upper left corner form a battery string. The battery strings are arranged in an array, spaced apart, and then electrically connected to form a battery cell array 10. String gaps 112 are formed between each battery string, including transverse and longitudinal string gaps 112. Cell gaps 111 are formed between battery cells 11 in the same battery string. A circumferential edge region is also formed around the entire battery string array.

[0035] As photovoltaic cells need to continuously reduce costs and increase efficiency, the thickness of the encapsulation film will gradually decrease. For photovoltaic laminates, especially photovoltaic laminates without a main grid, the thinned encapsulation film is difficult to form sufficient strength in the string gap 112, the cell gap 111 and the circumferential edge area of the cell array 10, which can easily cause failure problems in the above-mentioned positions.

[0036] For example, taking a main grid-free laminate as an example, in the production process of the main grid-free laminate, the welding of the soldering ribbon and the cell array 10 is realized during the lamination process. During this process, a pre-cross-linked carrier film is required to pre-fix the soldering ribbon and the cell array 10 to achieve alloyed contact (welding) between the two. The schemes for realizing the above-mentioned pre-fixation include a dispensing scheme and a coating scheme. Among them, the dispensing scheme is to lay the carrier film on the entire cell array 10, while the coating scheme is to place the carrier film only on the cell 11. The carrier film is not laid between the cells and between the strings of the cell 11, and then the encapsulation film is laid. During the lamination process, due to the small amount of film between the cells and between the strings and the insufficient strength, it is easy to cause cold welding between the soldering ribbon and the cell, increasing the risk of failure during use.

[0037] It should be noted that the materials of the above-mentioned carrier film and the encapsulation adhesive film are basically the same, and it is a pre-crosslinked low-gram-weight adhesive film. For example, after the formation of the adhesive film, it is irradiated by ultraviolet rays or other means to form the carrier film. Among them, the encapsulation adhesive film can be an ethylene-vinyl acetate copolymer (EVA) adhesive film, a polyolefin elastomer (POE) adhesive film, or a combination of the two, etc.

[0038] Figure 4 is an axonometric structural schematic diagram of a photovoltaic laminate according to another embodiment of the present invention; Figure 5 is a top view structural schematic diagram of the second grid structure 32 according to an embodiment of the present invention; Figure 6 is a top view structural schematic diagram of the first grid structure 31 according to an embodiment of the present invention. As Figure 4 and Figure 6 shown, the photovoltaic laminate of the exemplary embodiment of the present invention includes a cover plate 50, a first adhesive film 41, a battery cell array 10, a first grid structure 31, a second adhesive film 42, and a back plate 60 that are stacked in sequence. The battery cells 11 of the battery cell array 10 are arranged at intervals; the first grid structure 31 is formed by a plurality of first strips, and the plurality of first strips are woven from first fibers; the orthographic projection of the plurality of first strips on the battery cell array 10 covers at least other areas of the battery cell array 10 except the battery cells 11.

[0039] In practical applications, the carrier film adopts a film laminating scheme, that is, as Figure 4 shown, carrier films are attached to both surfaces of each battery cell 11 in the battery cell array 10. The first grid structure 31 is formed by weaving first fibers to have a plurality of first strips that crisscross each other. Among them, the positions of the respective first strips correspond to the series gaps 112, the cell gaps 111, and the circumferential edge regions of the battery cell array 10, and the sizes of the respective first strips are sufficient to cover the above three regions.

[0040] First, lay the cover plate 50, and then lay the first adhesive film 41, the battery cell array 10 covered with the carrier film, the first grid structure 31, the second adhesive film 42, and the back plate 60 on the cover plate 50 in sequence. Then laminate the above-laid stack to obtain a photovoltaic laminate. In this embodiment, the first grid structure 31 is arranged between the battery cell array 10 and the second adhesive film 42 on the back. When the second adhesive film 42 melts, the first strips are combined with the second adhesive film 42 to form a reinforcing structure, which can ensure that the adhesive film in the series gaps 112, the cell gaps 111, and the circumferential edge regions of the battery cell array 10 has sufficient strength to ensure the welding strength, thereby reducing the risk of failure between the solder tape and the battery cell in a thermal cycling environment.

[0041] In the above-described embodiments, the shape of the first grid structure 31 is the same as that of the second grid structure 32 shown in Figure 5 . The first strip A part 311 in the first grid structure 31 is opposite to the longitudinal sheet gap 111 in the cell array 10, the longitudinal first strip B part 312 is opposite to the longitudinal string gap 112 in the cell array 10, the transverse first strip B part 312 is opposite to the transverse string gap 112 in the cell array 10, and the circumferential first strip C part 313 is opposite to the circumferential edge region in the cell array 10. Specifically, a plurality of first strip A parts 311 and a plurality of first strip B parts 312 intersect vertically and horizontally, dividing the rectangular area surrounded by the first strip C part 313 into a plurality of first grids, and each first grid corresponds to one cell 11 in the cell array 10.

[0042] In some embodiments, the first grid structure 31 formed by the first strip A part 311, the first strip B part 312, and the first strip C part 313 has a positive projection on the cell array 10 that covers the other areas of the cell array 10 except the cells 11 and does not overlap with any of the cells 11.

[0043] In some other embodiments, the first grid structure 31 formed by the first strip A part 311, the first strip B part 312, and the first strip C part 313 has a positive projection on the cell array 10 that covers the other areas of the cell array 10 except the cells 11 and overlaps with the cells 11. That is, for the same first grid, the positive projection of the first strip that encloses the first grid on the cell array 10 overlaps with the circumferential edge region of the cell 11 corresponding to the first grid, so as to ensure that the adhesive film in the circumferential area of the same cell 11 can be reinforced by the first fiber, thereby reducing the risk of failure of the photovoltaic laminate at this position.

[0044] Continuing as shown in Figure 6 , the first grid structure 31 in the photovoltaic laminate of the exemplary embodiment of the present invention further includes a sub-grid structure 70 formed in each first grid. The sub-grid structure 70 is formed by a plurality of sub-strips, and the plurality of sub-strips are woven from the first fiber. Exemplarily, the width of the sub-strip can be less than or equal to the width of the first strip.

[0045] In practical applications, the sub-stripes of the sub-grid structure 70 can be formed simultaneously during the weaving process of the first stripe. In the same sub-grid structure 70, multiple first sub-stripes 71 in the horizontal direction and multiple second sub-stripes 72 in the vertical direction intersect with each other, dividing the area surrounded by the first grid into more smaller grids, thereby forming the sub-grid structure 70. Each sub-grid structure 70 corresponds to a cell 11 in the cell array 10. Through the sub-grid structure 70 woven from the first fibers, the fiber mesh on the back of the cell 11 is denser than the fiber mesh in the peripheral area on the side of the cell 11. Thus, the fibers on the back of the cell 11 can reflect the light passing through the cell 11 back to the cell 11, thereby improving the photoelectric conversion efficiency.

[0046] Exemplarily, the material of the first fiber can be high-strength fibers such as glass fiber and polyethylene fiber.

[0047] Exemplarily, the cross-sectional shape of the first fiber includes a circle or a trapezoid. The circular or trapezoidal first fiber can reflect light in different directions, thereby increasing the utilization of light and improving the photoelectric conversion efficiency of the cell.

[0048] Figure 7 It is a partial enlarged structural schematic diagram of the stripe according to the embodiment of the present utility model. As Figure 7 shown, the first stripe of the exemplary embodiment of the present utility model is woven with the first fiber in a plain weave manner, and can also be formed by other weaving methods, such as twill weave and satin weave.

[0049] In some embodiments, the color of the first fiber can be white or black. The white or black first grid structure 31 woven can increase the utilization of light in the inter-cell, inter-string, and peripheral edge areas, and can replace the glazing of the backplane 60. The backplane 60 can be backplane glass, and glazing on the backplane glass will reduce its strength, with the risk of the laminate bursting. Thus, compared with glazing on the backplane glass, using the first grid structure 31 can not only increase the utilization of light, but also reduce the production cost and improve the strength of the backplane glass.

[0050] When the first fiber is glass fiber, it can be prepared by adding carbon black masterbatch particles or aniline black masterbatch particles to the glass fiber, or can be prepared into black glass fiber by adding copper oxide, manganese dioxide, cobalt oxide, and iron tetroxide and heating them together.

[0051] Exemplarily, the sub-grid structure 70 can also be woven with white or black first fibers, which can increase the reflection of infrared light passing through the cell 11, and thus can improve the photoelectric conversion efficiency of the cell.

[0052] Exemplarily, the thickness of the first grid structure 31, that is, the thickness of the first strip and the first sub-strip 71, ranges from 0.05 mm to 0.3 mm respectively, such as 0.07 mm, 0.09 mm, 0.1 mm, 0.13 mm, 0.15 mm, 0.17 mm, 0.19 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, etc. Within the above thickness range, the corresponding adhesive film strengthening effect can be exerted, and the reflection and utilization of light can also be increased. The thickness direction of the first grid structure 31 refers to the stacking direction of each layer in the photovoltaic laminate.

[0053] Exemplarily, the thickness of the above-mentioned carrier film is 0.05 mm to 0.1 mm.

[0054] Figure 2 is an axonometric structural schematic diagram of a photovoltaic laminate according to an embodiment of the present invention; as Figure 2 shown, in the photovoltaic laminate of the exemplary embodiment of the present invention, for the cell array 10, the carrier film adopts a dispensing scheme and covers the cell array 10 in a paving form. A first carrier film 21 is covered on the front of the cell array 10, and a second carrier film 22 is covered on the back. Then, a second grid structure 32, a first adhesive film 41, and a cover plate 50 are sequentially laid on the front of the cell array 10; a first grid structure 31, a second adhesive film 42, and a back plate 60 are sequentially laid on the back of the cell array 10; finally, the above-mentioned laminate is subjected to a lamination process to form a photovoltaic laminate.

[0055] In practical applications, the second grid structure 32 is formed by a plurality of second strips, and the plurality of second strips are woven by second fibers; the orthographic projection of the plurality of second strips on the cell array 10 at least covers other regions of the cell array 10 except for the cells.

[0056] The second strips in the second grid structure 32 are woven by second fibers, and each second grid of the second grid structure 32 corresponds to a cell 11 on the cell array 10.

[0057] Exemplarily, the A part 321 of the second strip faces the longitudinal strip gap 111 in the cell array 10, the longitudinal B part 322 of the second strip faces the longitudinal string gap 112 in the cell array 10, the transverse B part 312 of the first strip faces the transverse string gap 112 in the cell array 10, and the circumferential C part 323 of the second strip faces the circumferential edge region in the cell array 10. Specifically, a plurality of A parts 321 of the second strip and a plurality of B parts 322 of the second strip are vertically and horizontally interlaced, and the rectangular area surrounded by the C part 323 of the second strip is divided into a plurality of second grids, and each second grid corresponds to a cell in the cell array 10.

[0058] In some embodiments, the second grid structure 32 formed by the second strip A portion 321, the second strip B portion 322, and the second strip C portion 323, in the orthographic projection on the cell array 10, covers other areas of the cell array 10 except for the cells, and has no overlap with each cell.

[0059] In other embodiments, the second grid structure 32 formed by the second strip A portion 321, the second strip B portion 322, and the second strip C portion 323, in the orthographic projection on the cell array 10, covers other areas of the cell array 10 except for the cells 11, and has an overlap with the cells 11. That is, for the same second grid, the orthographic projection of the second strip that encloses the second grid on the cell array 10 has an overlap with the circumferential edge area of the cell 11 corresponding to the second grid, so as to ensure that the adhesive film in the circumferential area of the same cell 11 can be reinforced by the second fiber, thereby reducing the risk of failure of the photovoltaic laminate at this position.

[0060] Exemplarily, the thickness of the second grid structure 32, that is, the thickness of the second strip, has a value range of 0.05 mm to 0.3 mm, such as 0.07 mm, 0.09 mm, 0.1 mm, 0.13 mm, 0.15 mm, 0.17 mm, 0.19 mm, 0.21 mm, 0.23 mm, 0.25 mm, 0.27 mm, 0.29 mm, etc. The corresponding adhesive film strengthening effect can be exerted within the above thickness range.

[0061] Exemplarily, the second fiber is made of a highly transparent material to minimize the blocking of light. For example, the material of the second fiber can be a high-strength fiber such as glass fiber or polyethylene fiber.

[0062] Exemplarily, the cross-sectional shape of the second fiber includes a circle or a trapezoid. The circular or trapezoidal second fiber can reflect light in different directions, thereby increasing the utilization of light and improving the photoelectric conversion efficiency of the cell.

[0063] As Figure 7 shown, the second strip of the exemplary embodiment of the present invention is woven with the second fiber in a plain weave, and can also be formed in other weaving ways, such as twill, satin, etc.

[0064] It can be seen therefrom that the second grid structure 32 and the first grid structure 31 are respectively laid on the front and back sides of the cell array 10, wherein the second grid structure 32 is made of a transparent material and the first grid structure 31 is made of a white or black material, which can increase the utilization of light, and at the same time locally enhance the adhesive film strength in the inter-cell, inter-string, and peripheral edge areas of the cell array 10, reduce the risk of virtual soldering, and improve the reliability of the photovoltaic laminate.

[0065] Figure 3 It is an axonometric structural schematic diagram of a photovoltaic laminate according to another embodiment of the present invention. As Figure 3 shown, the difference between the exemplary embodiment of the present invention and the Figure 2 embodiment shown is that the cell array 10 adopts a film covering scheme, that is, a carrier film is covered on both surfaces of each cell, rather than covering the first carrier film 21 and the second carrier film 22 integrally on the front and back respectively. The other structures are the same and will not be elaborated here.

[0066] The exemplary embodiment of the present invention further provides a photovoltaic module, including the photovoltaic laminate of the above embodiment and a frame. The peripheral edge part of the photovoltaic laminate is clamped in the corresponding cavity of the frame, and the frame provides the functions of protecting and supporting the photovoltaic laminate.

[0067] The technical advantages of the above photovoltaic module compared with the prior art are the same as those of the photovoltaic laminate of the above embodiment and will not be elaborated here.

[0068] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present invention and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications can be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A photovoltaic laminate, characterized in that, It includes a cover plate, a first glue film, a battery cell array, a first grid structure, a second glue film and a backplane which are laminated in sequence, and the battery cells of the battery cell array are arranged at intervals. The first grid structure is formed by a plurality of first strips, and the plurality of first strips are woven from first fibers. The orthographic projection of the plurality of first strips on the battery cell array covers at least other areas of the battery cell array except the battery cells.

2. The photovoltaic laminate according to claim 1, characterized in that, The battery cells of the battery cell array correspond one by one to the first grids of the first grid structure. The orthographic projection of the first strips forming the same first grid on the battery cell array overlaps with the circumferential edge part of the corresponding battery cell.

3. The photovoltaic laminate according to claim 2, characterized in that, The first grid structure further includes a sub-grid structure formed within the first grid, and the sub-grid structure is formed by a plurality of sub-strips, and the plurality of sub-strips are woven from the first fibers.

4. The photovoltaic laminate according to any one of claims 1-3, characterized in that, The color of the first fibers includes black or white.

5. The photovoltaic laminate according to any one of claims 1 to 3, characterized in that, The shape of the cross-section of the first fibers includes circular or trapezoidal.

6. The photovoltaic laminate according to claim 3, wherein The thicknesses of the first strips and the sub-strips are both in the range of 0.05 mm to 0.3 mm.

7. The photovoltaic laminate according to any one of claims 1 to 3, characterized in that, The photovoltaic laminate further includes a second grid structure laminated between the first glue film and the battery cell array, and the second grid structure is formed by a plurality of second strips, and the plurality of second strips are woven from second fibers. The orthographic projection of the plurality of second strips on the battery cell array covers at least other areas of the battery cell array except the battery cells.

8. The photovoltaic laminate according to claim 7, wherein The thickness of the second strips is in the range of 0.05 mm to 0.3 mm.

9. The photovoltaic laminate according to claim 7, wherein The second fibers are light-transmitting fibers. Or / and, the shape of the cross-section of the second fibers includes circular or trapezoidal.

10. A photovoltaic module, characterized in that, It includes the photovoltaic laminate according to any one of claims 1-9.

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