Backboard glass for photovoltaic module and photovoltaic module using same

Abstract

The back plate glass comprises a film pasting area and a film coating area, the film coating area is located on the periphery of the film pasting area, the film pasting area is coated with a reflective film, the reflective film is in a grid shape in the film pasting area, the film coating area is provided with a high-reflection film coating layer, and the high-reflection film coating layer is arranged on the film pasting area. The film coating area comprises long edge areas located at the long edge of the back plate glass, short edge areas located at the short edge of the back plate glass and a middle grid area communicated with the middle points of the two long edge areas, the middle grid area is parallel to the short edge areas, and the middle grid area is used for reflecting light at the installation position of the junction box. According to the scheme, a layer of high-reflection coating film is plated on the part, which is not convenient to be coated with the reflective film, of the back plate glass, so that the back plate glass can be smoothly mounted, light rays at the edge of the back plate and the mounting position of the junction box can be reflected to the photovoltaic module, the power of the photovoltaic module is further improved, and the generating capacity of the photovoltaic module is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic modules, and more specifically, to a back plate glass for a photovoltaic module and a photovoltaic module using the glass. Background Art

[0002] Photovoltaic modules are the core and most important part of a solar power generation system. The glass used in photovoltaic modules includes front glass and back glass. Since there are gaps between cells in a photovoltaic module, the back glass is generally full grid glass, such as Figure 1 As shown, the full-grid glass has grid treatment on all the gaps between photovoltaic modules. The reflective coating at the grid can reflect the sunlight passing through the gaps onto the photovoltaic modules, thereby improving the power of the photovoltaic modules and increasing the power generation of the photovoltaic modules.

[0003] However, the coating cost of grid glass is relatively high during production. In order to reduce the cost of back glass, most of the existing technologies use filmed glass instead of grid glass. Filmed glass is a reflective film applied to fully transparent glass. The reflective film is used to reflect sunlight that passes through the gaps between photovoltaic modules back onto the photovoltaic modules. Since filmed glass does not require coating, its cost is significantly lower than that of coated glass. However, in actual use, it was found that due to the conductive properties of the reflective film, after applying the film to the edges of the glass and the junction box installation, the reflective film here cannot be fully adhered, which is inconvenient for the subsequent installation of the filmed glass. In order to make the use and installation of filmed glass more convenient, the filmed glass in the existing technology does not have reflective films on the edges of the glass and the junction box installation. Figure 2 Without the reflective film at the above locations, the filmed glass can be smoothly installed on the photovoltaic module. However, the filmed glass cannot reflect light around the edges of the glass and where the junction box is installed. The sunlight here will directly pass through the photovoltaic module, resulting in a waste of resources. Utility Model Content

[0004] In order to overcome the problem in the above-mentioned prior art that the edges of the filmed glass and the installation position of the junction box cannot reflect light, the utility model provides a back panel glass for photovoltaic modules and a photovoltaic module using the glass, and improves the light reflection efficiency of the filmed glass by coating the positions on the back panel glass where the film cannot be applied.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution: a backplane glass for a photovoltaic module, the backplane glass comprising a film-applied area and a coating area, the coating area being located around the edges of the film-applied area, the film-applied area being coated with a reflective film in a grid pattern in the film-applied area, the coating area being provided with a highly reflective coating layer, the coating area comprising a long side area located at the long edges of the backplane glass, a short side area located at the short edges of the backplane glass, and an intermediate grid area connecting the midpoints of the two long side areas, the intermediate grid area being parallel to the short side areas. The intermediate grid area reflects light that passes through the gap at the junction box installation location, reflecting it onto the photovoltaic module.

[0006] The back glass in this solution is coated with a high-reflective coating in the coating area where it is not convenient to apply reflective film, so that this area can smoothly reflect the light that passes through the gap and shines on this area back to the photovoltaic module without affecting the installation of the back glass, thereby further improving the power of the photovoltaic module and increasing the power generation of the photovoltaic module.

[0007] Preferably, the width of the long side area is not less than 20mm; the width of the short side area is not less than 22mm; and the width of the middle grid area is not less than 16mm. The thickness of the high-reflective coating layer is 18μm-27μm. Experimental measurements show that the width of the reflective area required at the long side of the back glass edge generally needs to be no less than 20mm, the width of the reflective area required at the short side needs to be no less than 22mm, and the width of the reflective area required at the junction box installation location needs to be no less than 16mm. Therefore, the width of the long side area of the coating area is set to be no less than 20mm; the width of the short side area is set to be no less than 22mm; and the width of the middle grid area is set to be no less than 16mm. The specific widths can be determined based on actual conditions. When the thickness of the high-reflective coating layer is too large, it will affect the installation of the back glass. However, if the thickness of the high-reflective coating layer is too small, the light reflection effect is not ideal. Experimental measurements show that when the thickness of the high-reflective coating layer is between 18μm and 27μm, it can achieve good reflection effect without affecting the installation of the back glass.

[0008] Preferably, first positioning protrusions are equidistantly arranged on the long side region, located on the side of the long side region closest to the film application area. The first positioning protrusions on the two long side regions are symmetrically arranged with the line connecting the midpoints of the two short side regions as the axis of symmetry. Second positioning protrusions are provided on the short side region, located on the side of the short side region closest to the film application area. The second positioning protrusions on the two short side regions are symmetrically arranged with the axis of the middle grid region as the axis of symmetry. A plurality of third positioning protrusions are equidistantly arranged on both sides of the middle grid region, located on the line connecting the two symmetrical second positioning protrusions. The middle grid region divides the film application area into two sections, and the third protrusions on both sides of the middle grid region are respectively located within the two film application areas. The spacing between two adjacent first positioning protrusions is 80mm-100mm; the spacing between two adjacent second positioning protrusions is 170mm-200mm. When applying reflective film to the film application area, the two ends of the reflective film are located on two symmetrical first positioning protrusions, or on the second and third positioning protrusions on the same axis parallel to the long side area within the same film application area. The arrangement of the first, second, and third positioning protrusions facilitates positioning the reflective film in the film application area, improving accuracy and efficiency during film application.

[0009] Preferably, the reflective film has a width of 5mm-10mm. The reflective film comprises a reflective structural layer, a substrate layer, and a hot-melt adhesive layer, arranged in sequence. The hot-melt adhesive layer is bonded to and adheres to the backplane glass. The width of the reflective film is determined by the gap between the cells in the battery assembly, which is generally 1mm-4mm. Setting the width of the reflective film slightly larger than the gap between the cells can improve light reflection.

[0010] A photovoltaic module using the above-mentioned back panel glass includes a frame and a front glass, an upper film, a battery module, a lower film and the back panel glass arranged in sequence within the frame. The front glass, the upper film, the battery module, the lower film and the back panel glass are adhered to the card groove on the frame by frame adhesive.

[0011] After using the above-mentioned back panel glass, the photovoltaic module in this solution can reflect the light passing through the gaps in the battery module, further improving the power of the photovoltaic module and increasing the power generation of the photovoltaic module.

[0012] Preferably, the side wall of the slot that contacts the back glass is an inclined side wall, the side of the inclined side wall near the bottom of the slot being inclined toward the side away from the back glass, and the end of the inclined side wall away from the bottom of the slot being provided with a rounded corner. The provision of the inclined side wall allows for more frame adhesive to be injected into the slot, providing a better fixation effect on the back glass. The provision of the rounded corner makes it easier to place the front glass, upper adhesive film, battery module, lower adhesive film, and back glass into the slot on the frame.

[0013] Preferably, the front glass is high-transmittance glass, and both the upper and lower films are high-transmittance films. The front glass is high-transmittance glass, and the upper film is a high-transmittance film, allowing light to pass smoothly through the front glass and the upper film to illuminate the battery module. The lower film is a high-transmittance film, allowing light that passes through the battery assembly to pass smoothly through the lower film to illuminate the reflective film or high-reflective coating on the back glass, where it is reflected and then re-illuminated onto the battery module.

[0014] Compared with the prior art, the present invention has the following advantages: the back panel glass in this solution is coated with a highly reflective coating on the portion where reflective film is not conveniently applied. This not only allows for smooth installation of the back panel glass, but also reflects light from the back panel edge and the junction box installation area onto the photovoltaic module, further increasing the power and power generation of the photovoltaic module. After using the aforementioned back panel glass, the photovoltaic module in this solution can reflect light that passes through the gaps in the battery module, further increasing the power and power generation of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of full grid glass;

[0016] Figure 2 It is a structural diagram of film glass;

[0017] Figure 3 This is a schematic structural diagram of a back glass used in a photovoltaic module of the present invention;

[0018] Figure 4 This is a schematic structural diagram of a reflective film in a back glass of a photovoltaic module according to the present invention;

[0019] Figure 5 This is a schematic diagram of the partial structure of a photovoltaic module of the present invention.

[0020] Among them, 1. Back glass; 101. Film area; 2. Reflective film; 102. Long side area; 103. Short side area; 104. Middle grid area; 121. First positioning protrusion; 131. Second positioning protrusion; 141. Third positioning protrusion; 201. Reflective structure layer; 202. Base material layer; 203. Hot melt adhesive layer; 3. Frame; 4. Front glass; 5. Upper adhesive film; 6. Battery module; 7. Lower adhesive film; 301. Card slot; 311. Inclined side wall; 312. Rounded corners. DETAILED DESCRIPTION

[0021] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0022] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0024] Example 1

[0025] Example 1 of a back plate glass for a photovoltaic module, such as Figure 3 As shown, the back glass 1 includes a film area 101 and a coating area. The coating area is located around the edges of the film area 101. The film area 101 is covered with a reflective film 2 in a grid pattern on the film area 101. The coating area is provided with a highly reflective coating layer. The coating area includes a long side area 102 located at the long edges of the back glass 1, a short side area 103 located at the short edges of the back glass 1, and a middle grid area 104 connecting the midpoints of the two long side areas 102. The middle grid area 104 is parallel to the short side area 103. The middle grid area 104 reflects light that passes through the gap where the junction box is installed, reflecting it onto the photovoltaic module.

[0026] Specifically, the width of the long side region 102 is not less than 20 mm, the width of the short side region 103 is not less than 22 mm, and the width of the middle grid region 104 is not less than 16 mm. The thickness of the high-reflective coating layer is 18 μm-27 μm.

[0027] Beneficial effects of this embodiment: The back glass 1 in this solution is coated with a layer of high-reflective coating in the portion where it is inconvenient to apply the reflective film 2, so that the area can smoothly reflect the light that passes through the gap to the photovoltaic module without affecting the installation of the back glass, further improving the power of the photovoltaic module and increasing the power generation of the photovoltaic module. The width of the long side area 102 is not less than 20mm; the width of the short side area 103 is not less than 22mm; the width of the middle grid area 104 is not less than 16mm, so that the width of the coating area is greater than the gap width, and the coating area has a good reflective effect. The thickness of the high-reflective coating layer is 18μm-27μm, which has a good light reflection effect and is also convenient for the installation of the back glass 1.

[0028] Example 2

[0029] Example 2 of a back plate glass for a photovoltaic module, based on Example 1, as Figure 3 and Figure 4 As shown, the structure of the back panel glass 1 is further limited.

[0030] Specifically, a plurality of first positioning protrusions 121 are evenly spaced on the side of the long side region 102 away from the edge of the back glass 1. The first positioning protrusions 121 on the two long side regions 102 are symmetrically arranged with the line connecting the midpoints of the two short side regions 103 as the axis of symmetry. A plurality of second positioning protrusions 131 are evenly spaced on the side of the short side region 103 away from the edge of the back glass 1. The second positioning protrusions 131 on the two short side regions 103 are symmetrically arranged with the axis of the middle grid region 104 as the axis of symmetry. A plurality of third positioning protrusions 141 are evenly spaced on both sides of the middle grid region 104. The third positioning protrusions 141 are located on the line connecting the two symmetrical second positioning protrusions 131. The middle grid region 104 divides the film application region 101 into two sections, and the third protrusions 141 on both sides of the middle grid region 104 are located in the two film application regions 101 respectively.

[0031] Specifically, the distance between two adjacent first positioning protrusions 121 is 80 mm-100 mm; the distance between two adjacent second positioning protrusions 131 is 170 mm-200 mm.

[0032] Specifically, the width of the reflective film 2 is 5mm-10mm. The reflective film 2 includes a reflective structure layer 201, a base material layer 202 and a hot melt adhesive layer 203 arranged in sequence, wherein the hot melt adhesive layer 203 is bonded to the back panel glass 1 and adhered to the back panel glass 1.

[0033] The beneficial effects of this embodiment are as follows: the provision of the first positioning protrusion 121, the second positioning protrusion 131, and the third positioning protrusion 141 facilitates positioning of the reflective film 2 in the film application area 101, improving the accuracy and efficiency of film application. The width of the reflective film 2 is determined by the gap between the cells, which is generally 1mm-4mm. Setting the width of the reflective film 2 slightly larger than the width of the gap between the cells can achieve a better light reflection effect.

[0034] Example 3

[0035] An embodiment of a photovoltaic module using the back glass 1 as described in embodiment 1 or embodiment 2, as Figure 5 As shown, it includes a frame 3 and a front glass 4, an upper film 5, a battery module 6, a lower film 7 and a back glass 1 arranged in sequence in the frame 3. The front glass 4, the upper film 5, the battery module 6, the lower film 7 and the back glass 1 are adhered to the card slot 301 of the frame 3 through the adhesive of the frame 3.

[0036] Specifically, the side wall of the card slot 301 that abuts the back panel glass 1 is an inclined side wall 311. The side of the inclined side wall 311 close to the bottom of the card slot 301 is inclined toward the side away from the back panel glass 1. The end of the inclined side wall 311 away from the bottom of the card slot 301 is provided with a chamfered corner 312.

[0037] Specifically, the front glass 4 is high-transmittance glass, and the upper adhesive film 5 and the lower adhesive film 7 are both high-transmittance adhesive films.

[0038] Beneficial effects of this embodiment: After using the above-mentioned back glass 1, the photovoltaic module in this solution can reflect the light passing through the gap of the battery module 6, further improving the power of the photovoltaic module and increasing the power generation of the photovoltaic module. The setting of the inclined side wall 311 of the card slot 301 allows more frame 3 adhesive to be injected into the card slot 301, which has a better fixing effect on the back glass 1. The setting of the rounded corner 312 makes it easier for the front glass 4, the upper adhesive film 5, the battery module 6, the lower adhesive film 7 and the back glass 1 to be placed in the card slot 301 on the frame 3. The front glass 4 is a high-transmittance glass, and the upper adhesive film 5 is a high-transmittance adhesive film, so that light can smoothly pass through the front glass 4 and the upper adhesive film 5 to illuminate the battery module 6. The lower adhesive film 7 is a high-transmittance adhesive film, so that the light passing through the battery module can smoothly pass through the lower adhesive film 7 to illuminate the reflective film 2 or the high-reflection coating layer on the back glass 1, and then re-irradiate the battery module 6 after reflection.

[0039] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art would be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A back glass for a photovoltaic module, characterized in that: The back panel glass (1) comprises a film area (101) and a coating area, wherein the coating area is located at the four edges of the film area (101), the film area (101) is covered with a reflective film (2), and the reflective film (2) is in a grid shape on the film area (101), and the coating area is provided with a high-reflective coating layer, and the coating area comprises a long side area (102) located at the long side edge of the back panel glass (1), a short side area (103) located at the short side edge of the back panel glass (1), and an intermediate grid area (104) connecting the midpoints of the two long side areas (102), and the intermediate grid area (104) is parallel to the short side area (103).

2. The back glass for a photovoltaic module according to claim 1, characterized in that: The width of the long side area (102) is not less than 20 mm; the width of the short side area (103) is not less than 22 mm; and the width of the middle grid area (104) is not less than 16 mm.

3. The back glass for a photovoltaic module according to claim 1, characterized in that: The thickness of the high-reflective coating layer is 18 μm-27 μm.

4. The back glass for a photovoltaic module according to claim 1, characterized in that: The long side area (102) is provided with first positioning protrusions (121) arranged at equal intervals. The first positioning protrusions (121) are located on the side of the long side area (102) close to the film-applying area (101). The first positioning protrusions (121) on the two long side areas (102) are symmetrically arranged with the line connecting the midpoints of the two short side areas (103) as the axis of symmetry. The short side area (103) is provided with second positioning protrusions (131). The second positioning protrusions (131) are located on the side of the long side area (102) close to the film-applying area (101). The second positioning protrusions (131) are located on one side of the short side area (103) close to the film-applying area (101), and the second positioning protrusions (131) on the two short side areas (103) are symmetrically arranged with the axis of the middle grid area (104) as the symmetry axis; a plurality of third positioning protrusions (141) are equidistantly arranged on both sides of the middle grid area (104), and the third positioning protrusions (141) are located on the connecting line of the two symmetrical second positioning protrusions (131).

5. The back glass for photovoltaic modules according to claim 4, characterized in that: The distance between two adjacent first positioning protrusions (121) is 80 mm to 100 mm; the distance between two adjacent second positioning protrusions (131) is 170 mm to 200 mm.

6. The back glass for a photovoltaic module according to claim 1, characterized in that: The width of the reflective film (2) is 5mm-10mm.

7. The back glass for a photovoltaic module according to claim 6, characterized in that: The reflective film (2) comprises a reflective structure layer (201), a base material layer (202), and a hot melt adhesive layer (203) arranged in sequence, wherein the hot melt adhesive layer (203) is bonded to and adheres to the back panel glass (1).

8. A photovoltaic module using the back glass (1) according to any one of claims 1 to 7, characterized in that: The invention comprises a frame (3) and front glass (4), an upper adhesive film (5), a battery module (6), a lower adhesive film (7) and the back glass (1) arranged in sequence in the frame (3); the front glass (4), the upper adhesive film (5), the battery module (6), the lower adhesive film (7) and the back glass (1) are adhered to a card slot (301) on the frame (3) by adhesive on the frame (3).

9. A photovoltaic module according to claim 8, characterized in that: The side wall of the card slot (301) that abuts against the back panel glass (1) is an inclined side wall (311), and the side of the inclined side wall (311) close to the bottom of the card slot (301) is inclined toward the side away from the back panel glass (1), and the end of the inclined side wall (311) away from the bottom of the card slot (301) is provided with a chamfered corner (312).

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