Photovoltaic module

Abstract

The utility model discloses a photovoltaic module, including a plurality of photovoltaic cell piece, solder strip, the confluence band and the color coordination band. The confluence band includes the electric connection layer and the conductive layer, and the conductive layer is electrically connected with the solder strip through the electric connection layer. The one side of the width direction of color coordination band covers the corresponding one side surface of the light surface of confluence band, and the other side of the width direction of color coordination band extends between the back light surface of photovoltaic cell piece and solder strip. According to the photovoltaic module of the utility model, the one side of the width direction of color coordination band is suitable for shielding the confluence band, to promote the color consistency of photovoltaic module corresponding confluence band position, thereby promoting the appearance coordination of photovoltaic module. The other side of the width direction of color coordination band is arranged at the back light surface of photovoltaic cell piece, is favorable to meet the appearance demand of photovoltaic module, avoids the color coordination band shielding the light surface of photovoltaic cell piece simultaneously, thereby is favorable to guarantee photovoltaic cell piece receiving sunlight, and is further favorable to guarantee the photoelectric conversion efficiency of photovoltaic module.

Description

Technical Field

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

[0002] A combiner strip is a metal strip used to connect photovoltaic cells and junction boxes. It is usually made of copper and plated with conductive materials such as tin and silver. Its main function is to collect the current generated by multiple photovoltaic cells connected in series or parallel, transmit it to the junction box, and then lead the current out through the junction box to the combiner box, inverter and other equipment to finally realize the output of solar power.

[0003] In related technologies, the busbar is usually silver. To ensure that the photovoltaic modules have a consistent color, a shading structure is often used to block the busbar from the light-facing side of the photovoltaic cells. However, the above shading method can easily block part of the photovoltaic cells, resulting in a decrease in the power of the photovoltaic modules. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a photovoltaic module that, while meeting the aesthetic requirements of a photovoltaic module, ensures that the photovoltaic cells receive sunlight, thereby guaranteeing the photoelectric conversion efficiency of the photovoltaic module.

[0005] A photovoltaic module according to an embodiment of the present invention includes: a plurality of photovoltaic cells, wherein the two sides of the photovoltaic cells in the thickness direction are respectively a light-facing surface and a back-lighting surface; a solder ribbon, wherein the plurality of photovoltaic cells are electrically connected by the solder ribbon, and at least a portion of the solder ribbon is located on the back-lighting surface of the photovoltaic cells; a busbar, wherein the busbar includes an electrical connection layer and a conductive layer, and the conductive layer is electrically connected to the solder ribbon through the electrical connection layer; and a color coordination strip, wherein one side of the color coordination strip in the width direction covers the surface of the busbar corresponding to the light-facing surface, and the other side of the color coordination strip in the width direction extends between the back-lighting surface of the photovoltaic cells and the solder ribbon.

[0006] According to an embodiment of the present invention, the photovoltaic module utilizes a color coordination band. One side of the color coordination band, in its width direction, covers the corresponding light-facing side of the busbar, effectively shading the busbar and improving color consistency at the busbar location, thus enhancing the module's overall appearance. The other side of the color coordination band extends between the backlight surface of the solar cell and the solder ribbon, further enhancing the module's appearance consistency and harmony by shading the gaps between the solar cell, solder ribbon, and busbar. Furthermore, the other side of the color coordination band is positioned on the backlight surface of the solar cell, satisfying the module's appearance requirements while preventing the color coordination band from shading the light-facing side of the solar cell, thus ensuring the solar cell receives sunlight and consequently guaranteeing the module's photoelectric conversion efficiency.

[0007] According to some embodiments of the present invention, the electrical connection layer is disposed on the surface of the conductive layer adjacent to the solder strip, the color coordination band is disposed on the side of the conductive layer away from the solder strip, and a portion of the color coordination band is located between the backlight surface of the photovoltaic cell and the solder strip.

[0008] According to some embodiments of the present invention, the color coordination strip includes: a carrier layer disposed on the side of the conductive layer away from the electrical connection layer; and a color coordination layer disposed on the side of the carrier layer away from the conductive layer.

[0009] According to some embodiments of the present invention, the photovoltaic module further includes: an adhesive layer, which is connected between the conductive layer and the carrier layer to connect the color coordination band and the busbar into one unit.

[0010] According to some embodiments of the present invention, the side of the color coordination layer away from the carrier layer has a reflective structure.

[0011] According to some embodiments of the present invention, there are multiple reflective structures, which are arranged sequentially along the width direction of the color coordination band. Each reflective structure includes two reflective surfaces connected to each other in the width direction of the color coordination band, and the included angle between the two reflective surfaces is α, wherein α satisfies: 60°≤α≤120°.

[0012] According to some embodiments of the present invention, the thickness of the carrier layer is D1, wherein D1 satisfies: 50um≤D1≤150um.

[0013] According to some embodiments of the present invention, the width of the color coordination band is greater than the width of the busbar.

[0014] According to some embodiments of the present invention, the width of the busbar is L, and the width of the color coordination band is H, wherein L and H satisfy: H / L≥2.

[0015] According to some embodiments of the present invention, the thickness of the conductive layer is D2, wherein D2 satisfies: 0.1mm≤D2≤0.3mm; and / or the thickness of the electrical connection layer is D3, wherein D3 satisfies: 3um≤D3≤20um.

[0016] According to some embodiments of the present invention, the photovoltaic cell is a back-contact cell, and the solder ribbon is located on the back surface of the photovoltaic cell.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the busbar and color coordination band of a photovoltaic module according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of a photovoltaic module according to an embodiment of the present utility model.

[0019] Figure label: 100: Photovoltaic modules; 1: Photovoltaic cell; 11: Light-facing side; 12: Backlighting side; 2: Solder ribbon; 3: Busbar; 31: Electrical connection layer; 32: Conductive layer; 4: Color coordination band; 41: Carrier layer; 42: Color coordination layer; 421: Reflective structure; 5: Adhesive layer. Detailed Implementation

[0020] The following is for reference. Figures 1-2 A photovoltaic module 100 according to an embodiment of the present utility model is described.

[0021] like Figures 1-2 As shown, the photovoltaic module 100 according to an embodiment of the present invention includes a plurality of photovoltaic cells 1, solder ribbons 2, busbars 3, and color coordination strips 4. In the description of the present invention, "a plurality of" means two or more.

[0022] Specifically, in the thickness direction of photovoltaic cell 1 (e.g., Figure 1The two sides of the photovoltaic cell 1 (in the vertical direction) are the light-facing surface 11 and the back-facing surface 12, respectively. Multiple photovoltaic cells 1 are electrically connected via solder ribbons 2, at least a portion of which is located on the back-facing surface 12 of the photovoltaic cell 1. The busbar 3 includes an electrical connection layer 31 and a conductive layer 32, with the conductive layer 32 electrically connected to the solder ribbons 2 via the electrical connection layer 31. The width direction of the color coordination band 4 (e.g., ...) Figure 1 The side of the color coordination band 4 (in the left and right direction) covers one side of the corresponding light-facing surface 11 of the busbar 3, and the other side of the color coordination band 4 extends into the space between the backlight surface 12 of the photovoltaic cell 1 and the solder strip 2.

[0023] For example, in Figure 1 and Figure 2 In the example, within the photovoltaic module 100, multiple photovoltaic cells 1, solder ribbons 2, and busbars 3 constitute a complete electrical connection system from current generation to current conduction. The light-facing surface 11 of the photovoltaic cell 1 is the side of the photovoltaic module 100 directly facing sunlight and is the main surface from which light energy is incident. It efficiently receives sunlight and converts light energy into electrical energy through the photovoltaic cell 1, serving as the "core front-end" of the module's power generation. The back-facing surface 12 of the photovoltaic cell 1 is the side of the photovoltaic module 100 facing away from sunlight. It provides protection, support, and electrical connection, protecting the internal photovoltaic cells 1 and circuits of the photovoltaic module 100, providing mechanical support, and enabling electrical series or parallel connections between modules. The busbar 3 is the core component in the photovoltaic module 100 that enables the series or parallel connection of the photovoltaic cells 1 and the collection and conduction of current. Multiple photovoltaic modules 100 are connected as a whole by solder ribbons 2 located on the back-facing surface 12. The solder ribbons 2 and photovoltaic cells 1 are welded together to form a low-resistance connection, ensuring smooth current conduction.

[0024] The conductive layer 32 of the busbar 3 has excellent conductivity, which reduces resistance and minimizes power loss during transmission. After being electrically connected to the solder ribbon 2, the conductive layer 32 allows current to be drawn from the solder ribbon 2 to the conductive layer 32 of the busbar 3. The conductive layer 32 and the solder ribbon 2 are connected to both sides of the electrical connection layer 31, which helps improve the connection stability between the busbar 3 and the solder ribbon 2. Simultaneously, the electrical connection layer 31 also protects the conductive layer 32, preventing oxidation and other damage caused by exposure, thus ensuring the reliability of the conductive layer 32.

[0025] The color coordination band 4 covers the side of the busbar 3 corresponding to the light-facing surface 11, effectively shading the busbar 3 to improve the color consistency of the photovoltaic module 100 at the corresponding position of the busbar 3, thereby enhancing the appearance coordination of the photovoltaic module 100. The other side of the color coordination band 4 extends between the backlight surface 12 of the photovoltaic cell 1 and the solder ribbon 2, effectively shading the gaps between the photovoltaic cell 1, the solder ribbon 2, and the busbar 3, further improving the appearance consistency and coordination of the photovoltaic module 100. Furthermore, the width direction of the color coordination band 4 is positioned on the backlight surface 12 of the photovoltaic cell 1, which helps meet the appearance requirements of the photovoltaic module 100 while preventing the color coordination band 4 from shading the light-facing surface 11 of the photovoltaic cell 1, thus ensuring that the photovoltaic cell 1 receives sunlight and consequently, ensuring the photoelectric conversion efficiency of the photovoltaic module 100. In addition, the structure of the color coordination band 4 is relatively simple, reducing the difficulty of installation and thus improving the production efficiency of the photovoltaic module 100.

[0026] Color coordination band 4 is made of high-temperature resistant composite material, withstanding temperatures greater than or equal to 150℃. Color coordination band 4 can be black or white; no specific limitation is made here.

[0027] According to an embodiment of the present invention, the photovoltaic module 100, by having one side of the color coordination band 4 in the width direction cover one side of the corresponding light-facing surface 11 of the busbar 3, is suitable for blocking the busbar 3, thereby improving the color consistency of the photovoltaic module 100 at the position corresponding to the busbar 3, and thus improving the appearance coordination of the photovoltaic module 100; the other side of the color coordination band 4 in the width direction extends between the backlight surface 12 of the photovoltaic cell 1 and the solder ribbon 2, and can be used to block the gap between the photovoltaic cell 1, the solder ribbon 2 and the busbar 3, thereby further improving the appearance consistency and coordination of the photovoltaic module 100. In addition, the other side of the color coordination band 4 in the width direction is located on the backlight surface 12 of the photovoltaic cell 1, which is beneficial to meeting the appearance requirements of the photovoltaic module 100 while avoiding the color coordination band 4 blocking the light-facing surface 11 of the photovoltaic cell 1, thereby ensuring that the photovoltaic cell 1 receives sunlight, and thus ensuring the photoelectric conversion efficiency of the photovoltaic module 100.

[0028] According to some embodiments of this utility model, refer to Figure 1 and Figure 2 An electrical connection layer 31 is disposed on the surface of the conductive layer 32 adjacent to the solder strip 2, and a color coordination band 4 is disposed on the side of the conductive layer 32 away from the solder strip 2. A portion of the color coordination band 4 is located between the backlight surface 12 of the photovoltaic cell 1 and the solder strip 2. The electrical connection layer 31 is disposed adjacent to the solder strip 2 to facilitate the connection of the busbar 3 to the solder strip 2 through the electrical connection layer 31. The single-sided placement of the electrical connection layer 31 on the conductive layer 32 helps to reduce the cost of the photovoltaic module 100.

[0029] The color coordination band 4 is located on the side away from the solder strip 2 to prevent damage to the color coordination layer 42 when the busbar 3 is connected to the solder strip 2. A portion of the color coordination band 4 is located between the back surface 12 of the photovoltaic cell 1 and the solder strip 2 to cover the light-transmitting area of ​​the back surface 12 of the photovoltaic cell 1, thereby improving the appearance consistency and coordination of the photovoltaic module 100.

[0030] Furthermore, referring to Figure 1 and Figure 2 The color coordination layer 4 includes a carrier layer 41 and a color coordination layer 42. The carrier layer 41 is disposed on the side of the conductive layer 32 away from the electrical connection layer 31, and the color coordination layer 42 is disposed on the side of the carrier layer 41 away from the conductive layer 32. The carrier layer 41 serves as the carrier for the color coordination layer 42, and its location on the side of the conductive layer 32 away from the electrical connection layer 31 facilitates the placement of the color coordination layer 42. The color coordination layer 42 can be a coating, and no specific limitation is made here. The color coordination layer 42 is disposed on the side of the carrier layer 41 away from the conductive layer 32 to achieve the covering effect of the color coordination layer 42, improving the coordination and uniformity of the appearance color of the photovoltaic module 100.

[0031] The carrier layer 41 is a high-temperature resistant composite material.

[0032] Furthermore, referring to Figure 1 and Figure 2 The photovoltaic module 100 further includes an adhesive layer 5, which connects the conductive layer 32 and the carrier layer 41 to integrate the color coordination band 4 and the busbar 3. The adhesive layer 5 improves the stability and reliability of the connection between the conductive layer 32 and the carrier layer 41. Furthermore, by integrating the color coordination band 4 with the busbar 3 and connecting the busbar 3 to the solder strip 2, the position of the color coordination band 4 can be fixed, reducing the placement steps of the color coordination band 4, improving the assembly yield of the photovoltaic module 100, and reducing the stability of the color coordination band 4's placement, preventing movement and ensuring the appearance consistency of the photovoltaic module 100.

[0033] According to some embodiments of this utility model, refer to Figure 1 and Figure 2 The side of the color coordination layer 42 away from the carrier layer 41 has a reflective structure 421. When light shines on the reflective structure 421 of the color coordination layer 42, the unabsorbed light is reflected back to the surface of the photovoltaic cell 1 by the reflective structure 421, increasing the secondary absorption of light by the photovoltaic cell 1, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100.

[0034] Further, refer to Figure 1There are multiple reflective structures 421, which are arranged sequentially along the width of the color coordination band 4. Each reflective structure 421 includes two reflective surfaces that are connected to each other along the width of the color coordination band 4, with an angle α between the two reflective surfaces, where α satisfies: 60°≤α≤120°. The cross-section of each reflective structure is approximately triangular. Setting the angle between the two connected reflective surfaces of each reflective structure 421 to 60°≤α≤120° is reasonable, as it helps the reflective structure 421 to fully reflect sunlight back to the surface of the photovoltaic cell 1, increasing the secondary absorption of light by the photovoltaic cell 1 and maximizing the photoelectric conversion efficiency of the photovoltaic module 100.

[0035] According to some embodiments of this utility model, refer to Figure 1 The thickness of the carrier layer 41 is D1, where D1 satisfies: 50µm ≤ D1 ≤ 150µm. When the thickness of the carrier layer 41 is less than 50µm, the structural strength of the carrier layer 41 is low, and the carrier layer 41 is prone to deformation, reducing its service life and stability. When the thickness of the carrier layer 41 is greater than 150µm, the thickness of the carrier layer 41 is large, increasing its weight and potentially reducing the connection stability between the color coordination band 4 and the busbar 3. Furthermore, the portion of the color coordination band 4 located between the backlight surface 12 of the photovoltaic cell 1 and the solder ribbon 2 has a larger thickness, increasing the distance between the solder ribbon 2 and the backlight surface 12 of the photovoltaic cell 1. Therefore, by setting the thickness of the carrier layer 41 to 50µm ≤ D1 ≤ 150µm, it is helpful to improve the structural strength of the carrier layer 41 while reducing its weight, and to reasonably control the distance between the solder ribbon 2 and the back surface of the photovoltaic cell 1, thereby reasonably controlling the volume of the photovoltaic module 100.

[0036] According to some other embodiments of the present invention, refer to Figure 1 and Figure 2 The width of the color coordination band 4 is greater than the width of the busbar 3. Therefore, the narrower width of the busbar 3 is suitable for meeting the connection requirements with the solder strip 2, ensuring a more reasonable cross-sectional area for the current transmission path of the busbar 3, reducing the resistance of the photovoltaic module 100, decreasing power loss, and improving the photoelectric conversion efficiency of the photovoltaic module 100. The wider width of the color coordination band 4 is suitable for covering the light-transmitting area of ​​the busbar 3 and the connection point between the solder strip 2 and the busbar 3 adjacent to the photovoltaic cell 1, thereby improving the consistency and aesthetics of the photovoltaic module 100's appearance.

[0037] According to some specific embodiments of this utility model, refer to Figure 1The width of the busbar 3 is L, and the width of the color coordination layer 4 is H, where L and H satisfy: H / L≥2. Therefore, the width of the color coordination layer 42 is reasonable, which can fully block the busbar 3 while meeting the need to cover the light-transmitting area at the connection between the photovoltaic cell 1 and the adjacent solder strip 2 and the busbar 3, thereby improving the appearance consistency of the photovoltaic module 100.

[0038] According to some embodiments of this utility model, refer to Figure 1 The thickness of the conductive layer 32 is D2, where D2 satisfies: 0.1mm ≤ D2 ≤ 0.3mm. The thickness of the conductive layer 32 is reasonable, suitable for meeting the output current requirements of the busbar 3, and avoids efficiency degradation due to heat generation in the conductive layer 32, thereby reducing the loss of the photovoltaic module 100.

[0039] The thickness of the electrical connection layer 31 is D3, where D3 satisfies: 3um ≤ D3 ≤ 20um. The thickness of the electrical connection layer 31 is reasonable, fully meeting the needs of connecting the solder strip 2 and the conductive layer 32, reducing resistance, avoiding the conductive layer 32 from being exposed and reacting due to the small thickness of the electrical connection layer 31, and reasonably controlling the cost of the electrical connection layer 31.

[0040] According to some embodiments of this utility model, the photovoltaic cell 1 is a back-contact cell, and the solder ribbon 2 is located on the back surface 12 of the photovoltaic cell 1. The positive and negative electrodes of the back-contact cell are all integrated on the back side. The solder ribbon 2 being located on the back surface 12 of the photovoltaic cell 1 helps to avoid affecting the photovoltaic cell 1's reception of light.

[0041] The assembly process of the photovoltaic module 100 is as follows: First, the photovoltaic cells 1, busbars 3, and solder ribbons 2 are laid out. The busbars 3 and solder ribbons 2 are then welded together. The busbars 3 are welded on a welding machine. Finally, a color coordination tape 4 is placed between the solder ribbon 2 and the backlight surface 12 of the photovoltaic cells 1. This reduces the shading effect on the photovoltaic cells 1 caused by placing the color coordination tape 4 separately in conventional processes.

[0042] Other configurations and operations of the photovoltaic module 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0043] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0046] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that, include: Multiple photovoltaic cells, wherein the two sides of the photovoltaic cells in the thickness direction are the light-facing side and the back-lighting side, respectively; A solder ribbon is used to electrically connect multiple photovoltaic cells, with at least a portion of the solder ribbon located on the back surface of the photovoltaic cells; The busbar includes an electrical connection layer and a conductive layer, wherein the conductive layer is electrically connected to the solder strip through the electrical connection layer; A color coordination strip, one side of which covers the surface of the busbar corresponding to the light-facing side, and the other side of which extends into the space between the backlight surface of the photovoltaic cell and the solder strip.

2. The photovoltaic module according to claim 1, characterized in that, The electrical connection layer is disposed on the surface of the conductive layer adjacent to the solder strip, and the color coordination band is disposed on the side of the conductive layer away from the solder strip. A portion of the color coordination band is located between the back surface of the photovoltaic cell and the solder strip.

3. The photovoltaic module according to claim 2, characterized in that, The color coordination band includes: A carrier layer is disposed on the side of the conductive layer away from the electrical connection layer; A color coordination layer is disposed on the side of the carrier layer away from the conductive layer.

4. The photovoltaic module according to claim 3, characterized in that, Further includes: An adhesive layer is provided between the conductive layer and the carrier layer to connect the color coordination band and the busbar into one unit.

5. The photovoltaic module according to claim 3, characterized in that, The side of the color coordination layer away from the carrier layer has a reflective structure.

6. The photovoltaic module according to claim 5, characterized in that, The reflective structure is multiple, and the multiple reflective structures are arranged sequentially along the width direction of the color coordination band. Each reflective structure includes two reflective surfaces that are connected to each other in the width direction of the color coordination band. The included angle between the two reflective surfaces is α, wherein α satisfies: 60°≤α≤120°.

7. The photovoltaic module according to claim 3, characterized in that, The thickness of the carrier layer is D1, wherein D1 satisfies: 50um≤D1≤150um.

8. The photovoltaic module according to claim 1, characterized in that, The width of the color coordination band is greater than the width of the busbar.

9. The photovoltaic module according to claim 1, characterized in that, The width of the busbar is L, and the width of the color coordination band is H, wherein L and H satisfy: H / L≥2.

10. The photovoltaic module according to claim 1, characterized in that, The thickness of the conductive layer is D2, wherein D2 satisfies: 0.1mm ≤ D2 ≤ 0.3mm; and / or The thickness of the electrical connection layer is D3, wherein D3 satisfies: 3um≤D3≤20um.

11. The photovoltaic module according to any one of claims 1-10, characterized in that, The photovoltaic cell is a back-contact cell, and the solder ribbon is located on the back surface of the photovoltaic cell.

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