Solar cell module

Abstract

The utility model discloses a solar cell module, which comprises a cell sheet layer, a rear film piece and a back plate which are laminated, the back plate is arranged on one side of the rear film piece far away from the cell sheet layer, the cell sheet layer comprises a plurality of cell sheets, gaps are arranged between the adjacent cell sheets and at the edge of the cell sheet layer, and the gaps are arranged between the cell sheets and the edge of the cell sheet layer. The surface of the back plate is provided with a co-color reflecting layer, the co-color reflecting layer is arranged on one side, close to the battery piece layer, in the back plate, the co-color reflecting layer can reflect light, the co-color reflecting layer comprises a co-color part, the position of the co-color part at least corresponds to the position of the gap, and the position of the co-color part at least corresponds to the position of the gap. The color of the co-color part is the same as or similar to the color of the front surface of the battery piece, and the co-color part is distributed in a partial area of the co-color reflecting layer or occupies the whole area of the co-color reflecting layer. According to the utility model, the consistency of the front appearance can be ensured, the backboard is prevented from generating serious heat effect, and the power generation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a solar cell assembly. Background Art

[0002] Solar cell modules typically consist of a front transparent layer, a cell layer, a rear film, and a backsheet. The cell layer generates current when stimulated by incident light. In existing cell layers, gaps exist between adjacent cells, between adjacent cell strings formed by the cells, and around the edges of the cell layers. These gaps create blank areas through which incident light passes to the backsheet. Furthermore, because the front transparent layer is fully transmissive and the rear film is fully or semi-transmissive, the color of the backsheet appears to show through these blank areas when viewed from the front of the module. The front of existing solar cells is usually dark blue or black. If the color of the backplane is inconsistent with the color of the front of the solar cell, it will affect the appearance of the front. If the backplane or rear film is set to dark blue or black, the color of the front of the battery module is basically the same. Although this is conducive to improving the overall appearance of the front, part of the incident light will pass through the blank area to reach the backplane, and the long-wave infrared light in other incident light has a relatively large penetration depth and cannot be completely absorbed by the solar cell. Part of the infrared light will also penetrate the solar cell layer to reach the backplane. The dark blue or black backplane easily absorbs the incident light and produces a thermal effect, which can easily cause the temperature of the module to rise, affecting the power generation efficiency; and if the rear film or backplane is set to white, although some of the light passing through the solar cell layer and the blank area will not have a major impact on the backplane, the white of the backplane or rear film will show through the blank area, affecting the overall appearance of the front of the battery module. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a solar cell assembly that can avoid serious thermal effects on the back plate while ensuring the consistency of the front appearance, thereby improving the power generation efficiency.

[0004] In order to solve the above technical problems, the utility model provides a solar cell assembly, comprising a stacked cell layer, a rear film member and a back plate, wherein the rear film member is arranged on the back side of the cell layer, and the back plate is arranged on the side of the rear film member away from the cell layer. The cell layer includes a plurality of cell sheets, and gaps are provided between adjacent cell sheets and at the edges of the cell layer.

[0005] The surface of the backplane is provided with a common color reflective layer, which is provided on the side of the backplane close to the battery cell layer. The common color reflective layer can reflect light. The common color reflective layer includes a common color portion, the position of the common color portion at least corresponds to the position of the gap, and the color of the common color portion is the same as or similar to the color of the front of the battery cell.

[0006] As an improvement to the above solution, the common color portion is distributed in a partial area of ​​the common color reflective layer, and the width of the common color portion is not less than the width of the gap.

[0007] As an improvement to the above solution, the orthographic projection of the edge of the common color portion overlaps with the orthographic projection of the edge of the battery cell, and the overlapping width is not less than 0.3 mm.

[0008] As an improvement of the above solution, the common color portion occupies the entire area of ​​the common color reflective layer, and the common color portion can cover the surface of one side of the backplane close to the battery layer.

[0009] As an improvement to the above solution, the infrared light reflectivity of the co-color reflective layer in the wavelength range of 700-1200 nm is not less than 55%.

[0010] As an improvement to the above solution, the co-color reflective layer includes a first reflective layer and a second reflective layer. The first reflective layer is arranged on a side of the second reflective layer close to the battery layer, and the reflectivity of the first reflective layer is higher than that of the second reflective layer.

[0011] As an improvement of the above solution, the backplane further includes a fixing layer, which is provided on a side of the common color reflective layer away from the cell layer, and the thickness of the fixing layer is not less than the thickness of the common color reflective layer.

[0012] As an improvement of the above solution, the backplane further includes a protective layer, which is provided on a side of the fixed layer away from the common color reflective layer, and the thickness of the protective layer is not less than the thickness of the common color reflective layer.

[0013] As an improvement of the above-mentioned solution, the solar cell assembly also includes a front film member and a front plate member. The front film member is arranged on the side of the cell layer away from the rear film member, and the front plate member is arranged on the side of the front film member away from the cell layer. Both the front film member and the front plate member are transparent members.

[0014] As an improvement to the above solution, the rear film is a transparent member or a colored member. When the rear film is a colored member, the color of the rear film is the same as or similar to the color of the front surface of the battery cell.

[0015] The implementation of this utility model has the following beneficial effects:

[0016] The solar cell assembly of the present invention is provided with a cell layer, a rear film and a back plate, wherein the cell layer includes a plurality of cells, and gaps are provided between adjacent cells and at the edges of the cell layer, and these gaps will be exposed on the front of the cell assembly, and the surface of the back plate is provided with a common color reflective layer, and the common color reflective layer includes a common color portion, and the position of the common color portion at least corresponds to the position of the gap. In this way, when observing from the front of the cell assembly, what is seen through the gap is the common color portion on the back plate, and the color of the common color portion is the same as or similar to the color of the front of the cell, so that a more consistent color can be formed from the front, ensuring the consistency of the front appearance, and the common color reflective layer can reflect light, so whether it is light passing through the cell layer to reach the back plate or light incident from the gap, the common color reflective layer can reflect the light back to the surface of the cell layer, avoiding the thermal effect of the back plate, and improving the photovoltaic utilization rate and power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front structure of the solar cell module of the utility model;

[0018] Figure 2 This is a schematic diagram of the partial cross-sectional structure of the solar cell module of the present utility model;

[0019] Figure 3 This is a schematic structural diagram of the first embodiment of the co-color reflective layer of the present utility model;

[0020] Figure 4 This is a schematic structural diagram of a second embodiment of the co-color reflective layer of the present utility model;

[0021] Figure 5 This is a schematic structural diagram of a third embodiment of the co-color reflective layer of the present utility model;

[0022] Figure 6 This is a schematic diagram of the cross-sectional structure of the back panel of the utility model;

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure of the solar cell assembly of the present utility model. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear in this document are based solely on the accompanying drawings and are not intended to limit the present invention.

[0025] See also Figure 1 and Figure 2The embodiment of the utility model discloses a solar cell module, comprising a stacked cell layer 1, a rear film member 2 and a back plate 3, wherein the rear film member 2 is arranged on the back side of the cell layer 1, and the back plate 3 is arranged on the side of the rear film member 2 away from the cell layer 1, and is used to fix the cell layer 1, and the cell layer 1 includes a plurality of cells 11, and gaps 12 are provided between adjacent cells 11 and at the edges of the cell layer 1. The gap 12 between adjacent cells 11 refers to both the gap 12 between two adjacent cells 11 and the gap 12 between different cell strings formed by connecting the cells 11. When in use, light is incident on the front side of the cell 11, part of the light falls within the gap 12, and part of the light penetrates the cell 11, and these rays eventually pass through the rear film member 2 and reach the back plate 3.

[0026] To improve the color consistency of the front surface of the battery assembly and prevent severe thermal effects on the backsheet 3, a co-chromatic reflective layer 31 is provided on the surface of the backsheet 3. The co-chromatic reflective layer 31 is located on the side of the backsheet 3 near the cell layer 1, i.e., on the surface of the backsheet 3. The co-chromatic reflective layer 31 constitutes a reflective film that reflects light. Light falling within the gaps 12 and entering the backsheet 3 from the conventional cell 11 are both reflected by the co-chromatic reflective layer 31. Part of the reflected light is then returned to the front surface of the cell 11. This reduces the risk of heat accumulation on the backsheet 3, preventing severe thermal effects. It also improves light collection efficiency on the front surface of the cell 11, thereby increasing short-circuit current and Pmax. Furthermore, the co-chromatic reflective layer 31 includes a co-chromatic portion 311, located at least at the location of the gaps 12. The color of the co-chromatic portion 311 is the same as or similar to the color of the front surface of the cell 11. In different embodiments, the common color portion 311 may only cover the position of the gap 12, or may cover the entire surface of the back plate 3. In this way, when observed from the front of the battery assembly, the color of the common color portion 311 exposed in the gap 12 can form a whole with the color of the front of the battery cell 11, thereby improving the consistency of the front appearance.

[0027] In implementation, the solar cell module provided by the present application can be a PERC (Passivated Emitter and Rear Cell, passivated emitter and back) cell, a TOPCon (Tunnel Oxide Passivating Contact, tunneling oxide passivation contact) cell, an HJT (Heterojunction with Intrinsic Thi nlayer, intrinsic thin film heterojunction) cell, a BC (Back Contact) cell or other types of solar cells, without limitation.

[0028] The beneficial effects of the embodiments of the present utility model are as follows:

[0029] The solar cell assembly of the embodiment of the present invention is provided with a cell layer 1, a rear film 2 and a back plate 3, wherein the cell layer 1 includes a plurality of cells 11, and gaps 12 are provided between adjacent cells 11 and at the edges of the cell layer 1. These gaps 12 are exposed on the front of the cell assembly, and the surface of the back plate 3 is provided with a common color reflective layer 31, and the common color reflective layer 31 includes a common color portion 311. The position of the common color portion 311 corresponds to at least the position of the gap 12. In this way, when observing from the front of the cell assembly, what is seen through the gap 12 is the back plate 3, and the color of the common color portion 311 is the same as or similar to the color of the front of the battery cell 11, so that a more consistent color can be formed from the front, ensuring the consistency of the front appearance, and the common color reflective layer 31 can reflect light, so that no matter whether it is light passing through the battery cell layer 1 to reach the back plate 3 or light incident from the gap 12, the common color reflective layer 31 can reflect the light back to the surface of the battery cell layer 1, avoiding serious thermal effects on the back plate 3, improving photovoltaic utilization and power generation efficiency, and thus improving short-circuit current and Pmax.

[0030] Specifically, the co-chromatic reflective layer 31 can be made of a macromolecular material such as an aromatic hydrocarbon compound. Its absorption band extends near the infrared region, absorbing ultraviolet and visible light but not infrared light. Therefore, it can reflect infrared light that could cause thermal effects back onto the surface of the cell 11, thus preventing severe thermal effects. The co-chromatic reflective layer 31 has an infrared reflectivity of no less than 55% within the wavelength range of 700-1200 nm, demonstrating excellent infrared light reflection.

[0031] See also Figure 3In the first embodiment, the common color portion 311 is distributed in a portion of the common color reflective layer 31, namely, located in a position corresponding to the gap 12. When viewed from the front of the battery assembly, the common color portion 311 is exposed from the gap 12 through the rear film 2. The width of the common color portion 311 is not less than the width of the gap 12, ensuring that the common color portion 311 can completely cover the gap 12. Furthermore, the orthographic projection of the edge of the common color portion 311 overlaps with the orthographic projection of the edge of the battery cell 11, and the overlap width is not less than 0.3 mm, ensuring that the edge of the common color portion 311 can still cover the gap 12 when viewed from an oblique angle.

[0032] See also Figure 4 In the second embodiment, the common color portion 311 occupies the entire area of ​​the common color reflective layer 31, and the common color portion 311 can cover the surface of the backplane 3 on the side close to the cell layer 1. In the second embodiment, the side of the backplane 3 close to the cell 11 is a black or dark blue reflective layer, which can maximize the color consistency of the front appearance and the reflection and utilization of light.

[0033] See also Figure 5 In the third embodiment, the co-color reflective layer 31 includes a first reflective layer 312 and a second reflective layer 313. The first reflective layer 312 is disposed on the side of the second reflective layer 313 that is closer to the cell layer 1. The reflectivity of the first reflective layer 312 is higher than that of the second reflective layer 313. By providing different reflective layers, infrared light can be reflected sequentially. The first reflective layer 312 can transmit the majority of the infrared light, while the infrared light that penetrates the first reflective layer 312 is further reflected by the second reflective layer 313, forming a gradient reflection and achieving a better infrared light reflection effect. In other embodiments, more reflective layers can be provided to achieve gradient reflection.

[0034] See also Figure 6 The backsheet 3 further includes a fixing layer 32, which is disposed on the side of the common color reflective layer 31 away from the cell layer 1. The thickness of the fixing layer 32 is no less than that of the common color reflective layer 31 and serves as the main layer supporting the backsheet 3. Furthermore, the backsheet 3 further includes a protective layer 33, which is disposed on the side of the fixing layer 32 away from the common color reflective layer 31 and has a thickness no less than that of the common color reflective layer 31. The protective layer 33 is the layer of the backsheet 3 that contacts the outside air and provides dust and water resistance.

[0035] See also Figure 7The solar cell assembly further includes a front film 4 and a front plate 5. The front film 4 is disposed on a side of the cell layer 1 that is away from the back film 2, and the front plate 5 is disposed on a side of the front film 4 that is away from the cell layer 1. Both the front film 4 and the front plate 5 are transparent. Light can pass through the transparent front film 4 and the front plate 5 and fall onto the surface of the cell 11. The color of the back sheet 3 can pass through the gap 12 and pass through the front film 4 and the front plate 5.

[0036] Furthermore, the rear film member 2 is a transparent member or a colored member. When the rear film member 2 is a transparent member, the color of the back panel 3 can be seen through the rear film member 2 and the gap 12 from the front film member 4 and the front panel member 5, forming an integrated whole with the surface color of the battery cell 11. When the rear film member 2 is a colored member, the color of the rear film member 2 is the same as or similar to the color of the front face of the battery cell 11. In this way, the color of the back panel 3 and the rear film member 2 can be seen through the gap 12 from the front film member 4 and the front panel member 5, forming an integrated whole with the surface color of the battery cell 11, which can further ensure the uniformity of color.

[0037] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A solar cell module, characterized in that: The battery layer comprises a stacked battery layer, a rear film and a back plate, wherein the rear film is arranged on the back of the battery layer, and the back plate is arranged on a side of the rear film away from the battery layer. The battery layer comprises a plurality of battery cells, and gaps are provided between adjacent battery cells and at the edges of the battery layer. The surface of the backplane is provided with a common color reflective layer, which is provided on the side of the backplane close to the battery cell layer. The common color reflective layer can reflect light. The common color reflective layer includes a common color portion, the position of the common color portion at least corresponds to the position of the gap, and the color of the common color portion is the same as or similar to the color of the front of the battery cell.

2. The solar cell assembly according to claim 1, wherein The common color portion is distributed in a partial area of ​​the common color reflective layer, and the width of the common color portion is not less than the width of the gap.

3. The solar cell assembly according to claim 2, wherein: The orthographic projection of the edge of the common color portion overlaps with the orthographic projection of the edge of the battery cell, and the overlapping width is not less than 0.3 mm.

4. The solar cell assembly according to claim 1, wherein The common color portion occupies the entire area of ​​the common color reflective layer, and the common color portion can cover a surface of one side of the backplane close to the battery layer.

5. The solar cell assembly according to claim 1, wherein The infrared light reflectivity of the common color reflective layer in the wavelength range of 700-1200 nm is not less than 55%.

6. The solar cell assembly according to claim 1, wherein The common color reflective layer includes a first reflective layer and a second reflective layer. The first reflective layer is provided on a side of the second reflective layer close to the cell layer. The reflectivity of the first reflective layer is higher than that of the second reflective layer.

7. The solar cell assembly according to claim 1, wherein The backplane further includes a fixing layer, which is provided on a side of the common color reflective layer away from the cell layer, and a thickness of the fixing layer is not less than a thickness of the common color reflective layer.

8. The solar cell assembly according to claim 7, characterized in that The back plate further includes a protective layer, which is arranged on a side of the fixed layer away from the common color reflective layer, and a thickness of the protective layer is not less than a thickness of the common color reflective layer.

9. The solar cell assembly according to claim 1, wherein The solar cell assembly also includes a front film and a front plate. The front film is arranged on the side of the cell layer away from the back film, and the front plate is arranged on the side of the front film away from the cell layer. Both the front film and the front plate are transparent.

10. The solar cell assembly according to claim 1, wherein The rear film is a transparent member or a colored member. When the rear film is a colored member, the color of the rear film is the same as or similar to the color of the front surface of the battery cell.

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