Photovoltaic module

Abstract

The application relates to a photovoltaic module, which comprises a cell string, a bus bar and an isolation strip, wherein the bus bar is arranged on the cell string; the isolation strip is arranged between the bus bar and the cell string, and the isolation strip is composed of an insulation layer and a barrier layer which are laminated into one body; the insulation layer can insulate current, and the barrier layer can block gas. The photovoltaic module integrates the insulation layer and the barrier layer into the isolation strip, so that the overall thickness of the photovoltaic module is uniform, the photovoltaic module can be uniformly stressed during lamination, and defects such as hidden cracks, cracked pieces or bubbles are prevented, thereby improving the yield of the photovoltaic module.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Technology

[0002] Photovoltaic modules typically include a back glass, a back film, a cell string, a front film, and a front glass, all stacked together. Busbars are installed on the cell string, and the back glass has openings for the busbars to pass through. The busbars are used to collect the current from the cell string and transmit it to the outside.

[0003] Multi-segmentation technologies such as three-segment and four-segment are significant means of increasing the output power of photovoltaic modules. After slicing, the circuit of the cell string is different from that of the conventional half-cell type cell string. In some areas, it is necessary to introduce insulating materials to block the electrical connection between the busbar and the cell to avoid the risk of short circuit.

[0004] Currently, for three- or four-cell photovoltaic modules, insulating strips are typically placed at the busbar locations requiring insulation to provide physical insulation. Additionally, some modules require an oxygen barrier film at the glass openings to block oxygen. However, the localized overlap of the oxygen barrier film and the insulating strip can lead to increased thickness in certain areas, resulting in uneven pressure distribution during lamination. This can cause microcracks or cell breakage beneath the busbars. Furthermore, the increased thickness can create height differences, hindering gas escape and causing gas accumulation in the openings, forming bubbles and severely impacting module yield. Utility Model Content

[0005] Therefore, it is necessary to provide a photovoltaic module that addresses the issue of how to avoid microcracks and cell breakages under the busbars and improve the yield of photovoltaic modules.

[0006] A photovoltaic module, comprising:

[0007] Battery string;

[0008] Busbar, the busbar being disposed on the battery string;

[0009] An isolation strip is disposed between the busbar and the battery string. The isolation strip includes an insulating layer and a barrier layer that are laminated together. The insulating layer can isolate current, and the barrier layer can isolate gas.

[0010] The technical solution will be further explained below:

[0011] In one embodiment, the insulating layer is a PET film layer.

[0012] In one embodiment, the barrier layer is an EVOH film layer.

[0013] In one embodiment, the isolation strip further includes a first process layer and a second process layer, wherein the first process layer is attached to the side of the insulating layer opposite to the barrier layer, and the second process layer is attached to the side of the barrier layer opposite to the insulating layer.

[0014] In one embodiment, the first process layer is an EVA film layer or a POE film layer; the second process layer is an EVA film layer or a POE film layer.

[0015] In one embodiment, the thickness of the first process layer is 0.2 mm to 0.8 mm; and / or, the thickness of the second process layer is 0.2 mm to 0.8 mm.

[0016] In one embodiment, the thickness of the insulating layer is 0.03 mm to 0.2 mm; and / or, the thickness of the barrier layer is 0.01 mm to 0.1 mm.

[0017] In one embodiment, the width of the isolation strip is greater than the width of the busbar.

[0018] In one embodiment, the width of the isolation strip is 10mm to 30mm.

[0019] In one embodiment, the photovoltaic module further includes a backsheet, a back film, a front film, and a cover plate. The backsheet, the back film, the battery string, the front film, and the cover plate are stacked sequentially. The busbar is disposed between the back film and the battery string. One side of the separator is bonded to the battery string, and the other side of the separator is bonded to the back film.

[0020] In the aforementioned photovoltaic module, by placing a spacer strip between the busbar and the battery string, the two are effectively isolated. The spacer strip comprises an integrated insulating layer and a barrier layer. The insulating layer effectively isolates the current flow between opposite electrodes on the busbar and the battery string, preventing short circuits. The barrier layer blocks gases, preventing oxygen, carbon dioxide, and other gases from entering the photovoltaic module. This reduces the risk of deterioration in photovoltaic module performance due to the formation of carbonic acid and hydrogen carbonate by carbon dioxide combined with water vapor in humid and hot environments. Furthermore, since the insulating and barrier layers are integrated, the module can be placed onto the battery string as a single unit during assembly. Compared to the traditional method of first placing the spacer strip and then placing the oxygen barrier film at the corresponding opening in the module glass, the photovoltaic module of this application reduces assembly operations, simplifies the manufacturing process, and improves production efficiency. Furthermore, the isolation strip formed by the composite of the insulation layer and the barrier layer ensures that the overall thickness of the photovoltaic module is uniform. This avoids the problem of localized thickening caused by the need to place an oxygen barrier film separately at the corresponding opening of the module glass in traditional photovoltaic modules. As a result, the photovoltaic module can be subjected to uniform stress during the lamination process, preventing defects such as microcracks, cracks, or bubbles from appearing in the photovoltaic module, and improving the yield of the photovoltaic module. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of a photovoltaic module according to one embodiment.

[0025] Figure 2 This is a cross-sectional view of a photovoltaic module according to one embodiment.

[0026] Figure 3 This is a cross-sectional view of the isolation strip of a photovoltaic module according to one embodiment.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10. Battery string; 20. Separator strip; 21. Insulating layer; 22. Barrier layer; 23. First process layer; 24. Second process layer; 30. Busbar; 41. Back adhesive film; 42. Front adhesive film; 51. Backplate; 52. Cover plate. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0035] One embodiment of this application provides a photovoltaic module, specifically, see [link to relevant documentation]. Figure 1 One embodiment of the photovoltaic module includes a cell string 10, a busbar 30, and a separator 20, wherein:

[0036] As is easily understood, the battery string 10 includes multiple battery cells and multiple solder strips. The multiple battery cells are arranged in an array, and the solder strips connect the multiple battery cells in series and parallel.

[0037] Busbar 30 is disposed on the battery string 10. It is easy to understand that busbar 30 is used to connect to the solder strip of the same polarity electrode on the battery string 10 to collect the current on the solder strip and output it to the outside of the photovoltaic module.

[0038] Combination Figure 2 as well as Figure 3 An isolation strip 20 is disposed between the busbar 30 and the battery string 10. The isolation strip 20 includes an insulating layer 21 and a barrier layer 22 laminated together, i.e., the insulating layer 21 and the barrier layer 22 are composited to form an integral film. The insulating layer 21 can isolate current; specifically, the insulating layer 21 is used to isolate the current between the busbar 30 and the opposite electrode to prevent short circuit. The barrier layer 22 can block gases. For example, the barrier layer 22 is used to block gases such as oxygen and carbon dioxide from entering the photovoltaic module.

[0039] In the aforementioned photovoltaic module, by placing the separator 20 between the busbar 30 and the cell string 10, the busbar 30 and the cell string 10 are effectively isolated. The separator 20 includes an integral insulating layer 21 and a barrier layer 22. The insulating layer 21 effectively isolates the current flow between opposite electrodes on the busbar 30 and the cell string 10, preventing short circuits. The barrier layer 22 blocks gases, preventing oxygen, carbon dioxide, and other gases from entering the photovoltaic module. This reduces the phenomenon of deteriorated photovoltaic module performance due to humid and hot aging caused by carbon dioxide combining with water vapor to form carbonic acid and hydrogen carbonate environments. Furthermore, since the insulating layer 21 and the barrier layer 22 are integrated, they can be placed onto the cell string 10 in one go during assembly. Compared to the traditional method of first placing the separator 20 and then placing the oxygen barrier film at the corresponding opening in the module glass, the photovoltaic module of this application reduces assembly operations, simplifies the manufacturing process, and improves production efficiency. Furthermore, the insulating layer 21 and the barrier layer 22 are combined into a single insulating strip 20, which makes the overall thickness of the photovoltaic module uniform. This avoids the problem of local thickening caused by the need to place an oxygen barrier film separately at the corresponding opening of the module glass in the insulating strip 20, which is a problem in traditional photovoltaic modules. This ensures that the photovoltaic module can be subjected to uniform stress during the lamination process, prevents defects such as microcracks, cracks or bubbles from appearing in the photovoltaic module, and improves the yield of the photovoltaic module.

[0040] Optionally, in some embodiments, the insulating layer 21 is a PET (Polyethylene Terephthalate) film. The PET film has high strength, good temperature resistance, and excellent insulation properties. While ensuring basic insulation, it can withstand certain external impacts and high temperatures, ensuring the stability of the insulating layer 21 during lamination. Furthermore, the PET film has high transparency, which does not affect the light absorption of the solar cell.

[0041] Optionally, in some embodiments, the barrier layer 22 is an EVOH (Ethylene-Vinyl Alcohol Copolymer) film. The EVOH film has excellent gas barrier properties, effectively blocking gases such as oxygen and carbon dioxide. At the same time, the EVOH film also has high transparency, so it does not affect the light absorption of the solar cell.

[0042] See Figure 3The separator 20 also includes a first process layer 23 and a second process layer 24. The first process layer 23 is attached to the side of the insulating layer 21 facing away from the barrier layer 22, and the second process layer 24 is attached to the side of the barrier layer 22 facing away from the insulating layer 21. By protecting the insulating layer 21 and the barrier layer 22 with the first process layer 23 and the second process layer 24, the processability of the separator 20 can be effectively improved, and the buffering performance of the separator 20 can be improved, further preventing the battery cells from developing microcracks or fragmentation.

[0043] Optionally, in some embodiments, the first process layer 23 is an EVA (Ethylene-Vinyl Acetate Copolymer) film layer. The EVA film layer has good flexibility and weather resistance; it is soft, easily bent, and not prone to cracking, aging, and does not easily become brittle during outdoor use. Simultaneously, the EVA film layer also has strong adhesion, ensuring that the separator strip 20 is stably adhered between the battery string 10 and the busbar 30.

[0044] In other embodiments, the first process layer 23 may also be a POE (Polyolefin Elastomer) film layer; the POE film layer also has good flexibility and weather resistance, and the POE film layer also has good impact resistance, which can buffer external impact and avoid microcracks or fragmentation of the battery cell.

[0045] Similarly, in some embodiments, the second process layer 24 is an EVA (Ethylene-Vinyl Acetate Copolymer) film. The EVA film has good flexibility and weather resistance; it is soft, easily bent, and not prone to cracking, aging, and does not easily become brittle during outdoor use. At the same time, the EVA film also has strong adhesion, ensuring that the separator strip 20 is stably adhered between the battery string 10 and the busbar 30.

[0046] In other embodiments, the second process layer 24 may also be a POE (Polyolefin Elastomer) film layer; the POE film layer also has good flexibility and weather resistance, and the POE film layer also has good impact resistance, which can buffer external impact and avoid the problem of microcracks or fragmentation of the battery cell.

[0047] Optionally, in some embodiments, the thickness of the first process layer 23 is 0.2mm to 0.8mm; for example, 0.2mm, 0.4mm, 0.6mm, 0.8mm, etc. By limiting the thickness of the first process layer 23 to 0.2mm to 0.8mm, costs are controlled while ensuring that the first process layer 23 has sufficient buffering and connection performance so that the separator strip 20 can be stably bonded between the battery string 10 and the busbar 30, and buffer external impacts to avoid microcracks or fragmentation of the battery cells.

[0048] Similarly, the thickness of the second process layer 24 is 0.2mm to 0.8mm, such as 0.2mm, 0.4mm, 0.6mm, 0.8mm, etc. By limiting the thickness of the second process layer 24 to 0.2mm to 0.8mm, costs are controlled while ensuring that the second process layer 24 has sufficient buffering and connection performance so that the separator strip 20 can be stably bonded between the battery string 10 and the busbar 30, and buffer external impacts to avoid microcracks or fragmentation of the battery cells.

[0049] Optionally, in some embodiments, the thickness of the insulating layer 21 is 0.03mm to 0.2mm, such as 0.03, 0.05, 0.07, 0.09, 0.1, 0.15, 0.18, 0.2, etc. It is easily understood that if the thickness of the insulating layer 21 is too large, it will increase the overall thickness of the separator strip 20, thus affecting the overall assembly of the photovoltaic module. If the thickness of the insulating layer 21 is too small, it will lead to poor insulation performance and a tendency for short circuits. Therefore, configuring the thickness of the insulating layer 21 to be 0.03mm to 0.2mm ensures insulation performance without affecting the overall thickness of the photovoltaic module.

[0050] Optionally, the thickness of the barrier layer 22 is 0.01mm to 0.1mm, such as 0.01, 0.03, 0.05, 0.08, 0.1, etc. It is easy to understand that if the thickness of the barrier layer 22 is too large, it will increase the overall thickness of the separator strip 20, thus affecting the overall assembly of the photovoltaic module. If the thickness of the barrier layer 22 is too small, it will result in poor gas barrier performance. Therefore, configuring the thickness of the barrier layer 22 to 0.01mm to 0.1mm ensures the gas barrier effect without affecting the overall thickness of the photovoltaic module.

[0051] See Figure 1 In some embodiments, the width of the isolation strip 20 is greater than the width of the busbar 30. This ensures that the isolation strip 20 can completely isolate the busbar 30 from the battery string 10, preventing short circuits.

[0052] Specifically, in one embodiment, the width of the insulating strip 20 is 10mm to 30mm. It is easily understood that if the insulating strip 20 is too narrow, it cannot completely isolate the busbar 30 from the battery string 10, easily leading to a short circuit. If the insulating strip 20 is too wide, it requires more material, resulting in higher costs. By configuring the thickness of the insulating strip 20 to 10mm to 30mm, costs are controlled while ensuring that the insulating strip 20 can completely isolate the busbar 30 from the battery string 10.

[0053] See Figure 2 In some embodiments, the photovoltaic module further includes a back sheet 51, a back adhesive film 41, a front adhesive film 42, and a cover plate 52. The back sheet 51, the back adhesive film 41, the battery string 10, the front adhesive film 42, and the cover plate 52 are stacked in sequence. The busbar 30 is disposed between the back adhesive film 41 and the battery string 10. One side of the separator 20 is bonded to the battery string 10, and the other side of the separator 20 is bonded to the back adhesive film 41.

[0054] Optionally, both the backsheet 51 and the cover plate 52 can be made of glass, and the back adhesive film 41 and the front adhesive film 42 can be EVA (Ethylene-Vinyl Acetate Copolymer) film layers. The back adhesive film 41 and the front adhesive film 42 are used to bond the backsheet 51, the battery string 10, the busbar 30, the separator 20 and the cover plate 52 into one unit to encapsulate the photovoltaic module as a whole.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A photovoltaic module, characterized in that, include: Battery string (10); Busbar (30), the busbar (30) is disposed on the battery string (10); The isolation strip (20) is disposed between the busbar (30) and the battery string (10). The isolation strip (20) includes an insulating layer (21) and a barrier layer (22) that are stacked and composited together. The insulating layer (21) can isolate current, and the barrier layer (22) can block gas.

2. The photovoltaic module according to claim 1, characterized in that, The insulating layer (21) is a PET film layer.

3. The photovoltaic module according to claim 1, characterized in that, The barrier layer (22) is an EVOH film layer.

4. The photovoltaic module according to claim 1, characterized in that, The isolation strip (20) further includes a first process layer (23) and a second process layer (24). The first process layer (23) is attached to the side of the insulating layer (21) away from the barrier layer (22), and the second process layer (24) is attached to the side of the barrier layer (22) away from the insulating layer (21).

5. The photovoltaic module according to claim 4, characterized in that, The first process layer (23) is an EVA film layer or a POE film layer; the second process layer (24) is an EVA film layer or a POE film layer.

6. The photovoltaic module according to claim 4, characterized in that, The thickness of the first process layer (23) is 0.2 mm to 0.8 mm; and / or the thickness of the second process layer (24) is 0.2 mm to 0.8 mm.

7. The photovoltaic module according to claim 1, characterized in that, The thickness of the insulating layer (21) is 0.03 mm to 0.2 mm; and / or the thickness of the barrier layer (22) is 0.01 mm to 0.1 mm.

8. The photovoltaic module according to claim 1, characterized in that, The width of the isolation strip (20) is greater than the width of the busbar (30).

9. The photovoltaic module according to claim 1, characterized in that, The width of the isolation strip (20) is 10mm to 30mm.

10. The photovoltaic module according to any one of claims 1-9, characterized in that, The photovoltaic module also includes a back sheet (51), a back adhesive film (41), a front adhesive film (42), and a cover plate (52). The back sheet (51), the back adhesive film (41), the battery string (10), the front adhesive film (42), and the cover plate (52) are stacked in sequence. The busbar (30) is disposed between the back adhesive film (41) and the battery string (10). One side of the isolation strip (20) is bonded to the battery string (10), and the other side of the isolation strip (20) is bonded to the back adhesive film (41).

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