Gap film tape and photovoltaic module

Abstract

The utility model relates to photovoltaic technical field especially relates to a kind of gap film belt and photovoltaic module.The gap film belt includes the adhesion layer, substrate layer, structural layer and first metal light-reflecting layer that are sequentially laminated, first metal light-reflecting layer is provided with multiple discontinuous regions, each discontinuous region at least passes through first metal light-reflecting layer to cut off charge transmission path, multiple discontinuous regions separate first metal light-reflecting layer into multiple independent light-reflecting units, and multiple light-reflecting units are spaced distribution in the overhead direction of first metal light-reflecting layer.By discontinuous region penetration first metal light-reflecting layer, the continuity of first metal light-reflecting layer is directly cut off, charge that can possibly conduct through first metal light-reflecting layer cannot be transmitted across discontinuous region, to further reduce the short-circuit phenomenon that appears inside photovoltaic module, improve the reliability of photovoltaic module, prolong service life.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a gap film strip and a photovoltaic module. Background Technology

[0002] Back-contact battery technology, employing a cross-toothed distribution of positive and negative electrodes, achieves highly efficient electrode arrangement, effectively reducing light shading and significantly improving the photoelectric conversion efficiency of photovoltaic modules, making it an important development direction in the current photovoltaic field. Meanwhile, gap reflective film strips, as key auxiliary components in photovoltaic modules, improve the utilization rate of sunlight by reflecting light, further enhancing the power of photovoltaic modules, and have been widely used in the gap positions between cells and strings of photovoltaic modules.

[0003] Most existing gap reflective films use aluminum as the surface reflective material, such as... Figure 1 As shown, during the lamination process, the solder ribbon 2' of the photovoltaic module is prone to forming protrusions 1' due to deformation, tin melting, and other problems, which in turn squeeze and puncture the aluminum layer on the surface of the gap film strip. This causes the inter-cell film strip 3' to contact the positive electrode, while the inter-string film strip 4' may contact the negative electrode for other reasons, resulting in the formation of a circuit between different cells, causing a short circuit inside the photovoltaic module, which seriously affects the reliability and service life of the photovoltaic module.

[0004] Therefore, there is an urgent need to design a gap membrane strip and photovoltaic module to solve the above technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a gap film strip and a photovoltaic module that can reduce the occurrence of short circuits inside the photovoltaic module, improve the reliability of the photovoltaic module, and extend its service life.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a gap film strip, comprising an adhesive layer, a substrate layer, a structural layer and a first metal reflective layer stacked in sequence. The first metal reflective layer is provided with a plurality of discontinuous regions, each of which passes through the first metal reflective layer at least to cut off the charge transport path. The plurality of discontinuous regions divide the first metal reflective layer into a plurality of independent reflective units, and the plurality of reflective units are spaced apart in the top view direction of the first metal reflective layer.

[0008] As an optional technical solution for the gap film strip, the distance between the discontinuous regions is set to 0.5mm-5mm, and the area of ​​the discontinuous regions accounts for 10%-30% of the total area of ​​the first metal reflective layer.

[0009] As an alternative technical solution for the gap membrane strip, the reflective unit is at least one of the following shapes: triangular, square, rectangular, circular, elliptical, and wavy, viewed from above along the first metal reflective layer.

[0010] As an alternative technical solution for the gap membrane strip, the extension direction of the discontinuous region is one of the following: lateral extension, longitudinal extension, or a combination of lateral and longitudinal extension along the first metal reflective layer.

[0011] As an optional technical solution for the gap film strip, when the discontinuous region extends laterally along the first metal reflective layer, the discontinuous region is a plurality of transverse discontinuous strips distributed along the longitudinal direction of the first metal reflective layer, and the transverse discontinuous strips divide the first metal reflective layer into a plurality of reflective units arranged longitudinally.

[0012] When the discontinuous region extends longitudinally along the first metal reflective layer, the discontinuous region is a plurality of longitudinal discontinuous strips distributed in the transverse direction of the first metal reflective layer, and the longitudinal discontinuous strips divide the first metal reflective layer into a plurality of reflective units arranged in the transverse direction.

[0013] When the discontinuous region extends along the transverse and longitudinal directions of the first metal reflective layer, the discontinuous region forms a grid-like structure, which divides the first metal reflective layer into multiple reflective units arranged in an array.

[0014] As an alternative technical solution for the gap film strip, the extension direction of the discontinuous region is a plurality of inclined discontinuous strips extending at an angle of 30°-60° to the transverse direction of the first metal reflective layer, and the inclined discontinuous strips divide the first metal reflective layer into a plurality of reflective units arranged obliquely.

[0015] As an alternative technical solution for the gap membrane strip, the gap membrane strip further includes a second metal reflective layer, which is disposed between the adhesive layer and the substrate layer. The discontinuity region passes through the first metal reflective layer, the structural layer, the substrate layer and the second metal reflective layer to cut off the charge transport path.

[0016] On the other hand, this utility model also provides a photovoltaic module, which includes a back contact cell, a solder ribbon, a carrier film, a back adhesive film, a cell gap film and a string gap film.

[0017] A first gap is provided between two adjacent back contact cells, and the inter-cell gap film is disposed within the first gap; the solder ribbon is connected to the back contact cell, the carrier film covers the side of the solder ribbon away from the back contact cell, and the back adhesive film is laid on the side of the carrier film away from the solder ribbon; a second gap is provided between two adjacent strings of back contact cells, and the inter-string gap film is disposed within the second gap and located on the front or back side of the back adhesive film;

[0018] Both the inter-sheet gap membrane and the inter-string gap membrane are gap membranes as described in any of the above optional technical solutions.

[0019] As an optional technical solution for photovoltaic modules, the photovoltaic module further includes a front glass, a front encapsulating film, and a back glass. The front encapsulating film is laid on the inner side of the front glass, the back contact solar cells are laid on the side of the front encapsulating film away from the front glass, and the back glass is laid on the side of the back encapsulating film away from the carrier film.

[0020] As an optional technical solution for photovoltaic modules, the positive and negative electrodes of the back contact cell are distributed in a cross-tooth pattern, and the connection position of the solder ribbon with the positive and negative electrodes avoids the discontinuity area of ​​the gap film.

[0021] The beneficial effects of this utility model include at least the following:

[0022] This utility model provides a gap film strip, which includes an adhesive layer, a substrate layer, a structural layer and a first metal reflective layer stacked in sequence. The first metal reflective layer is provided with multiple discontinuous regions, each of which passes through the first metal reflective layer at least to cut off the charge transport path. The multiple discontinuous regions divide the first metal reflective layer into multiple independent reflective units, and the multiple reflective units are distributed at intervals in the top view direction of the first metal reflective layer.

[0023] As described above, by penetrating the first metal reflective layer through discontinuous regions, the continuity of the first metal reflective layer is directly severed, preventing the transfer of charges that might otherwise be conducted through the first metal reflective layer across the discontinuous regions. This ensures that even if the gap film is punctured or squeezed by the solder ribbon during lamination, a single reflective unit can only contact an electrode of a single polarity (such as the positive electrode). Adjacent reflective units, isolated by discontinuous regions, cannot form a conductive path with an electrode of another polarity (such as the negative electrode), thus greatly reducing the occurrence of short circuits within the photovoltaic module, improving the reliability of the photovoltaic module, and extending its service life. Furthermore, the reflective units have a light-reflecting function; when light shines on the surface of the reflective unit, it can reflect the light to the absorption area of ​​the solar cell, improving the light utilization rate of the photovoltaic module and increasing its power output.

[0024] This invention also provides a photovoltaic module that can reduce the occurrence of short circuits inside the photovoltaic module, improve the reliability of the photovoltaic module, and extend its service life. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a short circuit formed by a protrusion on the solder strip piercing the adhesive film on the back side, as provided in the prior art;

[0027] Figure 2 This is a schematic diagram of the gap membrane strip provided in Embodiment 1 of this utility model;

[0028] Figure 3 This is a top view of the triangular gap membrane strip of the reflective unit provided in Embodiment 1 of this utility model;

[0029] Figure 4 This is a top view of the circular gap film strip of the reflective unit provided in Embodiment 1 of this utility model;

[0030] Figure 5 This is a top view of the rectangular gap film strip of the reflective unit provided in Embodiment 1 of this utility model;

[0031] Figure 6 This is a top view of the gap membrane strip with transversely discontinuous strips provided in Embodiment 1 of this utility model;

[0032] Figure 7 This is a top view of the gap membrane strip with longitudinally discontinuous strips provided in Embodiment 1 of this utility model;

[0033] Figure 8 This is a top view of the gap membrane band with a grid-like structure in the discontinuous region provided in Embodiment 1 of this utility model;

[0034] Figure 9 This is a schematic diagram of the gap membrane strip provided in Embodiment 2 of this utility model;

[0035] Figure 10 This is a schematic diagram of the gap membrane strip provided in Embodiment 3 of this utility model;

[0036] Figure 11 This is a schematic diagram of the structure of the photovoltaic module provided in Embodiment 4 of this utility model;

[0037] Figure 12 This is a top view of the photovoltaic module provided in Embodiment 4 of this utility model.

[0038] Figure Labels

[0039] 1', spike; 2', weld strip; 3', inter-sheet membrane strip; 4', inter-series membrane strip;

[0040] 10. Adhesive layer; 20. Substrate layer; 30. Structural layer; 40. First metallic reflective layer; 41. Interrupted area; 411. Transverse interrupted strip; 412. Longitudinal interrupted strip; 42. Reflective unit; 50. Weather-resistant layer; 60. Second metallic reflective layer;

[0041] 100. Back contact cell; 200. Welding ribbon; 300. Carrier film; 400. Back adhesive film; 500. Inter-cell gap film strip; 600. Inter-string gap film strip; 700. Front glass; 800. Front adhesive film; 900. Back glass. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] Example 1

[0050] This embodiment provides a gap film strip and a photovoltaic module, which can reduce the occurrence of short circuits inside the photovoltaic module, improve the reliability of the photovoltaic module, and extend its service life.

[0051] like Figure 2As shown, the gap film mainly includes an adhesive layer 10, a substrate layer 20, a structural layer 30 and a first metal reflective layer 40 stacked in sequence. The first metal reflective layer 40 is provided with a plurality of discontinuous regions 41. Each discontinuous region 41 passes through the first metal reflective layer 40 at least to cut off the charge transport path. The plurality of discontinuous regions 41 divide the first metal reflective layer 40 into a plurality of independent reflective units 42, and the plurality of reflective units 42 are distributed at intervals in the top view direction of the first metal reflective layer 40.

[0052] Based on the above design, in this embodiment, the continuity of the first metal reflective layer 40 is directly cut off by the discontinuity region 41 penetrating the first metal reflective layer 40, preventing the charge that might have been conducted through the first metal reflective layer 40 from being transmitted across the discontinuity region 41. This ensures that even if the gap film is punctured or squeezed by the solder strip 200 during lamination, a single reflective unit 42 can only contact an electrode of a single polarity (such as the positive electrode), while adjacent reflective units 42, isolated by the discontinuity region 41, cannot form a conductive path with an electrode of another polarity (such as the negative electrode). This significantly reduces the occurrence of short circuits inside the photovoltaic module, improves the reliability of the photovoltaic module, and extends its service life.

[0053] The reflective unit 42 maintains the integrity of the first metallic reflective layer 40, ensuring that its light reflection function is not affected. When light shines on the surface of the reflective unit 42, the reflective unit 42 can reflect the light to the absorption area of ​​the solar cell, thereby improving the light utilization rate of the photovoltaic module and increasing the power of the photovoltaic module.

[0054] The layered adhesive layer 10, substrate layer 20 and structural layer 30 provide mechanical support for the first metal reflective layer 40, preventing structural damage to the reflective unit 42 caused by external force deformation. At the same time, the adhesive layer 10 ensures that the gap film can be stably attached to the inside of the photovoltaic module (such as the surface of the back contact cell 100 or the surface of the back adhesive film 400).

[0055] Preferably, the adhesive layer 10 in this embodiment is continuous, which improves the adhesion stability of the gap membrane strip.

[0056] Optionally, the adhesive layer 10 in this embodiment is made of ethylene-vinyl acetate copolymer. The main function of the adhesive layer 10 is to firmly adhere the gap film tape to other components of the photovoltaic module, such as the surface of the back contact cell 100 or the surface of the back adhesive film 400, to ensure the stability and reliability of the gap film tape inside the module. At the same time, it can also play a certain sealing role to prevent external moisture, dust and other impurities from entering the photovoltaic module.

[0057] Optionally, the substrate layer 20 in this embodiment is made of polyethylene terephthalate, which has high strength and good toughness, and can support the upper structural layer 30 and the first metal reflective layer 40, as well as the weight and stress of the lower adhesive layer 10, so as to prevent the gap membrane from deforming or wrinkling due to its own weight or external pressure.

[0058] Optionally, the structural layer 30 in this embodiment is made of polyolefin, which can improve the chemical resistance of the gap membrane, resist the erosion of trace small molecules volatilized from the encapsulant film inside the photovoltaic module, and extend its service life.

[0059] Optionally, in this embodiment, the first metallic reflective layer 40 is made of aluminum. Aluminum has good chemical stability and is not easily corroded in normal environments, making it suitable for long-term use in photovoltaic modules. At the same time, aluminum is a lightweight metal with high reflectivity and low cost.

[0060] Optionally, in this embodiment, multiple discontinuous regions 41 are formed on the first metal reflective layer 40 by laser cutting. The energy parameters of the laser cutting are controlled so that the cutting depth at least penetrates the first metal reflective layer 40. Of course, it can also penetrate the structural layer 30 and the substrate layer 20 according to actual needs.

[0061] Optionally, in this embodiment, the thickness of the adhesive layer 10 is set to be between 5μm and 20μm, the thickness of the substrate layer 20 is between 20μm and 50μm, the thickness of the structural layer 30 is between 10μm and 30μm, and the thickness of the first metal reflective layer 40 is between 0.01μm and 0.5μm.

[0062] In some optional implementations, the distance of the discontinuity region 41 is set to 0.5mm-5mm, which can ensure that adjacent reflective units 42 are effectively isolated (if the distance is too small, the reflective units 42 may accidentally come into contact due to deformation of the gap film; if the distance is too large, the reflective unit 42 will have an excessively large area, increasing the risk of forming a large current path after being punctured), and can also balance the number and area of ​​reflective units 42 to ensure overall reflective efficiency.

[0063] In some optional embodiments, the area of ​​the discontinuity region 41 accounts for 10%-30% of the total area of ​​the first metallic reflective layer 40. This avoids incomplete charge isolation due to the discontinuity region 41 being too small (<10%) (the first metallic reflective layer 40 may still conduct charge through unbroken micro-connections), or insufficient area of ​​the reflective unit 42 due to the discontinuity region 41 being too large (>30%), thus reducing light reflection efficiency. Therefore, setting this range between 10% and 30% achieves a balance between "short-circuit prevention" and "high reflectivity".

[0064] Optionally, such as Figures 3-5As shown, along the top view of the first metallic reflective layer 40, the reflective unit 42 is at least one of the following shapes: triangular, square, rectangular, circular, elliptical, and wavy.

[0065] For example, such as Figure 3 As shown, in a top view along the first metallic reflective layer 40, the reflective units 42 are triangular: the base of each triangle is parallel to the edge of the gap membrane strip, and the vertex faces the center of the membrane strip. Alternatively, the reflective units 42 are square: square reflective units 42 with a side length of 1 mm are equidistantly distributed along the transverse direction of the membrane strip. Or, the reflective units 42 are rectangular: rectangular reflective units 42 with a length of 3 mm and a width of 1 mm are arranged along the transverse direction of the membrane strip.

[0066] like Figures 6-8 As shown, the extension direction of the discontinuous region 41 is one of the following: lateral extension, longitudinal extension, or a combination of lateral and longitudinal extension along the first metallic reflective layer 40. It should be noted that the lateral direction is... Figure 6 The X-axis direction in the figure is the longitudinal direction. Figure 6 The Y-axis direction in the diagram.

[0067] Specifically, when the discontinuous region 41 extends laterally along the first metallic reflective layer 40, the discontinuous region 41 consists of multiple transverse discontinuous strips 411 distributed along the longitudinal direction of the first metallic reflective layer 40. The transverse discontinuous strips 411 divide the first metallic reflective layer 40 into multiple rectangular reflective units 42 arranged longitudinally. The transverse discontinuous strips 411 interrupt the charge transport path of the first metallic reflective layer 40 along the longitudinal direction.

[0068] When the discontinuous region 41 extends longitudinally along the first metallic reflective layer 40, the discontinuous region 41 consists of multiple longitudinal discontinuous strips 412 distributed in the transverse direction of the first metallic reflective layer 40. The longitudinal discontinuous strips 412 divide the first metallic reflective layer 40 into multiple rectangular reflective units 42 arranged in the transverse direction. The longitudinal discontinuous strips 412 cut off the charge transport path in the transverse direction.

[0069] When the discontinuous region 41 extends along the combination of the lateral and longitudinal directions of the first metallic reflective layer 40, the discontinuous region 41 forms a grid-like structure, which divides the first metallic reflective layer 40 into multiple arrayed reflective units 42. The grid-like discontinuous region 41 simultaneously cuts off the lateral and longitudinal charge transport paths, making it suitable for scenarios where charge may be conducted in any direction (such as when there are multiple irregular protrusions on the surface of the gap film), further improving the reliability of the photovoltaic module against internal short circuits.

[0070] In some optional embodiments, the extension direction of the discontinuity region 41 is multiple inclined discontinuities extending at an angle of 30°-60° to the transverse direction of the first metallic reflective layer 40. The inclined discontinuities divide the first metallic reflective layer 40 into multiple obliquely arranged reflective units 42. The 30°-60° inclination angle allows the inclined discontinuities to cut off charge transport paths that are not parallel to either the transverse or longitudinal direction. For example, when the solder ribbon 200 of the back contact cell 100 is arranged at an angle, the solder ribbon 200 may form an oblique charge path after piercing the film strip. The inclined discontinuities can specifically isolate such paths, thus supplementing the protection blind spots of the transverse discontinuities 411 and the longitudinal discontinuities 412.

[0071] For example, the discontinuous region 41 extends at a 45° angle to the lateral direction of the first metal reflective layer 40, forming multiple parallel inclined discontinuous strips with a spacing of 2 mm, dividing the first metal reflective layer 40 into multiple parallelogram-shaped reflective units 42.

[0072] Example 2

[0073] like Figure 9 As shown, this embodiment provides a gap film strip. The main difference between this gap film strip and the first embodiment is that the gap film strip in this embodiment includes a second metal reflective layer 60. The second metal reflective layer 60 is disposed between the adhesive layer 10 and the substrate layer 20. The discontinuity region 41 passes through the first metal reflective layer 40, the structural layer 30, the substrate layer 20 and the second metal reflective layer 60 to cut off the charge transport path.

[0074] Specifically, a second metallic reflective layer 60 (made of aluminum) is added between the adhesive layer 10 and the substrate layer 20. The first metallic reflective layer 40 is located above the structural layer 30, and the second metallic reflective layer 60 is located below the substrate layer 20. The discontinuous region 41 is cut from the surface of the first metallic reflective layer 40, passes through the structural layer 30 and the substrate layer 20 in sequence, and then penetrates the second metallic reflective layer 60, forming an isolation strip that runs through the two metallic reflective layers, separating the two metallic reflective layers into corresponding upper reflective units 42 and lower reflective units 42.

[0075] The design of the first metal reflective layer 40 and the second metal reflective layer 60 increases the path of light reflection. Light can be reflected by the first metal reflective layer 40, and the unreflected light passes through the structural layer 30 and the substrate layer 20 and is reflected again by the second metal reflective layer 60, which improves the utilization rate of incident light and indirectly increases the power of photovoltaic modules.

[0076] The remaining structures of the gap membrane strip in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0077] Example 3

[0078] like Figure 10 As shown, this embodiment provides a gap membrane tape. The main difference between this gap membrane tape and the first embodiment is that the gap membrane tape in this embodiment further includes a weather-resistant layer 50, which is disposed between the adhesive layer 10 and the substrate layer 20.

[0079] For example, the weather-resistant layer 50 is made of fluorocarbon resin. The weather-resistant layer 50 has a certain degree of hardness and flexibility, which can buffer the extrusion impact of the solder strip 200 during the lamination process. At the same time, the weather-resistant layer 50 has a certain degree of weather resistance, which is beneficial for the use of photovoltaic modules in high-temperature and high-humidity or coastal high-salt-fog environments.

[0080] The remaining structures of the gap membrane strip in this embodiment are the same as those in Embodiment 1, and will not be described in detail here.

[0081] Example 4

[0082] like Figures 11-12 As shown, this embodiment provides a photovoltaic module, which includes back contact cells 100, solder ribbons 200, carrier film 300, back adhesive film 400, inter-cell gap film strips 500, and inter-string gap film strips 600. A first gap is provided between two adjacent back contact cells 100, and the inter-cell gap film strip 500 is disposed within the first gap; the solder ribbon 200 is connected to the back contact cell 100, the carrier film 300 covers the side of the solder ribbon 200 away from the back contact cell 100, and the back adhesive film 400 is laid on the side of the carrier film 300 away from the solder ribbon 200; a second gap is provided between two adjacent strings of back contact cells 100, and the inter-string gap film strip 600 is disposed within the second gap and located on the front or back side of the back adhesive film 400; both the inter-cell gap film strip 500 and the inter-string gap film strip 600 are the aforementioned gap film strips.

[0083] The inter-cell gap film 500 isolates the charge between adjacent cells through the discontinuity region 41, preventing inter-cell short circuits caused by the deformation of the solder ribbon 200 puncturing the film. The inter-string gap film 600 isolates inter-string charge through the discontinuity region 41, preventing inter-string short circuits. In other words, both the inter-cell gap film 500 and the inter-string gap film 600 effectively cut off the charge transport path, preventing internal short circuits in the module caused by solder ribbon 200 deformation or solder melting. Simultaneously, the reflective units 42 of the gap film can increase light reflection and reuse, improving the photoelectric conversion efficiency of the module.

[0084] For example, along the thickness direction of the photovoltaic module, the inter-cell gap film in this embodiment can be disposed between the solder ribbon 200 and the back contact cell 100, or between the carrier film 300 and the solder ribbon 200, or between the carrier film 300 and the back adhesive film 400. Depending on actual needs, the inter-string gap film strip 600 can be disposed on one of the two opposite sides (front or back) of the back adhesive film 400.

[0085] In this embodiment, the discontinuous region 41 of the inter-cell gap film strip 500 extends longitudinally, and the inter-cell gap (first gap) of the back contact cell 100 is relatively narrow. During the lamination process, the solder ribbon 200 is prone to longitudinal burrs or arches due to heat deformation, tin melting, etc. The longitudinal discontinuity strip 412 can cut off the charge transport path of the metal reflective layer in the transverse direction. Even if the solder ribbon 200 punctures the film strip and contacts a reflective unit 42 (which may carry a positive charge), the adjacent reflective units 42 are isolated by the longitudinal discontinuity strip 412 and cannot form a path with the negative charge, thereby avoiding inter-cell short circuits.

[0086] The discontinuity region 41 of the inter-string gap membrane 600 extends laterally. The lateral discontinuity strip 411 can cut off the charge transport path of the metal reflective layer along the longitudinal direction. Even if the inter-string membrane is damaged by external force and comes into contact with a certain polarity charge, the lateral discontinuity strip 411 can prevent the charge from being conducted across strings and avoid short circuits between strings.

[0087] For example, the first gap is set to 2 mm and the second gap is set to 5 mm.

[0088] In this embodiment, the positive and negative electrodes of the back contact cell 100 are arranged in a cross-tooth pattern, and the connection points of the solder ribbon 200 with the positive and negative electrodes avoid the discontinuity region 41 of the gap film strip. That is, the connection point of the solder ribbon 200 with the positive electrode is located at the center of one of the reflective units 42 of the gap film strip, and the connection point of the solder ribbon 200 with the negative electrode is located at the center of another reflective unit 42. This ensures that the connection points of the solder ribbon 200 avoid the discontinuity region 41, preventing direct contact between the solder ribbon 200 and the edge of the discontinuity region 41. If the solder ribbon 200 contacts the edge of the discontinuity region 41, there is a risk of charge conduction across the discontinuity region 41 due to burrs or residual metal reflective layer at the edge.

[0089] The photovoltaic module in this embodiment also includes a back glass 900, a front encapsulating film 800, and a front glass 700. The front encapsulating film 800 is laid on the inner side of the front glass 700, the back contact cell 100 is laid on the side of the front encapsulating film 800 away from the front glass 700, and the back glass 900 is laid on the side of the back encapsulating film 400 away from the carrier film 300.

[0090] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0091] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A gap membrane band, characterized in that, The material includes an adhesive layer (10), a substrate layer (20), a structural layer (30), and a first metal reflective layer (40) stacked in sequence. The first metal reflective layer (40) has a plurality of discontinuous regions (41). Each discontinuous region (41) passes through the first metal reflective layer (40) at least to cut off the charge transport path. The plurality of discontinuous regions (41) divide the first metal reflective layer (40) into a plurality of independent reflective units (42), and the plurality of reflective units (42) are distributed at intervals in the top view direction of the first metal reflective layer (40).

2. The gap membrane strip according to claim 1, characterized in that, The distance between the discontinuous regions (41) is set to 0.5mm-5mm, and the area of ​​the discontinuous regions (41) accounts for 10%-30% of the total area of ​​the first metal reflective layer (40).

3. The gap membrane strip according to claim 1, characterized in that, Along the top view of the first metal reflective layer (40), the reflective unit (42) is at least one of the following shapes: triangle, square, rectangle, circle, ellipse and wave.

4. The gap membrane strip according to claim 1, characterized in that, The extension direction of the discontinuous region (41) is one of the following: lateral extension, longitudinal extension, or a combination of lateral and longitudinal extension along the first metal reflective layer (40).

5. The gap membrane strip according to claim 4, characterized in that... ； When the discontinuous region (41) extends laterally along the first metal reflective layer (40), the discontinuous region (41) is a plurality of transverse discontinuous strips (411) distributed along the longitudinal direction of the first metal reflective layer (40), and the transverse discontinuous strips (411) divide the first metal reflective layer (40) into a plurality of reflective units (42) arranged longitudinally. When the discontinuous region (41) extends along the longitudinal direction of the first metal reflective layer (40), the discontinuous region (41) is a plurality of longitudinal discontinuous strips (412) distributed along the transverse direction of the first metal reflective layer (40), and the longitudinal discontinuous strips (412) divide the first metal reflective layer (40) into a plurality of reflective units (42) arranged in the transverse direction. When the discontinuous region (41) extends along the combination of the transverse and longitudinal directions of the first metal reflective layer (40), the discontinuous region (41) forms a grid structure, which divides the first metal reflective layer (40) into a plurality of reflective units (42) arranged in an array.

6. The gap membrane strip according to claim 1, characterized in that, The discontinuous region (41) extends in the direction of multiple inclined discontinuous strips extending at an angle of 30°-60° to the transverse direction of the first metal reflective layer (40). The inclined discontinuous strips divide the first metal reflective layer (40) into multiple reflective units (42) arranged obliquely.

7. The gap membrane strip according to claim 1, characterized in that, The gap membrane also includes a second metal reflective layer (60), which is disposed between the adhesive layer (10) and the substrate layer (20). The discontinuity region (41) passes through the first metal reflective layer (40), the structural layer (30), the substrate layer (20) and the second metal reflective layer (60) to cut off the charge transport path.

8. A photovoltaic module, characterized in that, The photovoltaic module includes a back contact cell (100), a solder ribbon (200), a carrier film (300), a back adhesive film (400), an inter-cell gap film strip (500), and an inter-string gap film strip (600); A first gap is provided between two adjacent back contact solar cells (100), and an inter-cell gap film (500) is disposed within the first gap; a solder ribbon (200) is connected to the back contact solar cell (100), a carrier film (300) covers the side of the solder ribbon (200) away from the back contact solar cell (100), and a back adhesive film (400) is laid on the side of the carrier film (300) away from the solder ribbon (200); a second gap is provided between two adjacent strings of back contact solar cells (100), and an inter-string gap film (600) is disposed within the second gap and located on the front or back side of the back adhesive film (400); The inter-sheet gap membrane strip (500) and the inter-string gap membrane strip (600) are both gap membrane strips according to any one of claims 1-7.

9. The photovoltaic module according to claim 8, characterized in that, The photovoltaic module further includes a front glass (700), a front encapsulating film (800), and a back glass (900). The front encapsulating film (800) is laid on the inside of the front glass (700). The back contact solar cell (100) is laid on the side of the front encapsulating film (800) away from the front glass (700). The back glass (900) is laid on the side of the back encapsulating film (400) away from the carrier film (300).

10. The photovoltaic module according to claim 8, characterized in that, The positive and negative electrodes of the back contact cell (100) are arranged in a cross-tooth pattern, and the connection position of the solder strip (200) with the positive and negative electrodes avoids the discontinuity region (41) of the gap film strip.

Images