Double-sided solar panel

Abstract

The utility model provides a double-sided solar panel, which comprises a double-sided battery piece provided with a light receiving side and a backlight side which are opposite to each other; the first protection layer is arranged on the backlight side of the double-sided battery piece, the first protection layer comprises a first adhesive film layer and a first waterproof layer, and the first adhesive film layer is used for bonding the double-sided battery piece and the first waterproof layer and blocking part of light; the welding strip is positioned between the first adhesive film layer and the backlight side of the double-sided battery piece; and the second protection layer is arranged on the light receiving side of the double-sided battery piece. According to the double-sided solar panel provided by the utility model, sunlight can be received through the front surface and the back surface to generate electric energy, and compared with a single-sided product, the power generation efficiency can be obviously improved. By setting the first adhesive film layer to be semitransparent, the welding strip on the backlight side of the double-sided battery piece can be shielded, so that the welding strip looks unobvious, and the overall aesthetic property of the double-sided solar panel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a double-sided solar panel. Background Art

[0002] The front and back of the double-sided portable solar panel can receive sunlight to generate electricity, which can significantly improve the power generation efficiency compared with single-sided products. Currently, the double-sided products on the market mainly use crystalline silicon cells, and the appearance of the components is not completely black, and generally there are obvious white solder strips on the front and back. When using BC type cells without solder strips on the front, the white solder strips on the back are obvious, and the overall appearance lacks texture, affecting the consumer experience.

[0003] Therefore, how to design a double-sided solar panel that can reduce the white solder strip on the back side has become a problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0005] To this end, a first aspect of the present invention provides a double-sided solar panel.

[0006] In view of this, the first aspect of the utility model proposes a bifacial solar panel, comprising: a bifacial cell, the bifacial cell having a relative light-receiving side and a backlight side; a first protective layer, arranged on the backlight side of the bifacial cell, the first protective layer comprising a first adhesive film layer and a first waterproof layer, the first adhesive film layer being used to bond the bifacial cell and the first waterproof layer, and to block part of the light; a welding strip, the welding strip being located between the first adhesive film layer and the backlight side of the bifacial cell; and a second protective layer, arranged on the light-receiving side of the bifacial cell.

[0007] The double-sided solar panel provided by the utility model can generate electricity by receiving sunlight through the front and back surfaces, and can significantly improve the power generation efficiency compared with single-sided products. Specifically, the double-sided solar panel includes a double-sided cell, a first protective layer, a second protective layer and a welding strip. The first protective layer and the second protective layer can protect the double-sided cell, thereby preventing the double-sided cell from being damaged. In addition, while protecting the double-sided cell, the first protective layer can also shield the welding strip on the backlight side of the double-sided cell, so that when the double-sided solar panel is viewed as a whole, the welding strip looks inconspicuous or blocked, thereby improving the overall aesthetics of the double-sided solar panel. Specifically, a first adhesive film layer and a first waterproof layer can be provided in the first protective layer, so that the first adhesive film layer is provided on the side of the welding strip away from the double-sided cell, so that the first adhesive film layer is used to block part of the light to shield the welding strip. When shielding the welding strip, the welding strip can be shielded by a translucent first adhesive film layer, or by a dark-colored (for example, gray) first adhesive film layer, so that the welding strip is roughly the same color as the other parts of the double-sided cell structure. In this way, when viewing the double-sided solar panel as a whole, it is not easy to find the existence of the welding strip, making the overall appearance more beautiful. In addition to shielding the welding strip, the first adhesive film layer can also bond the double-sided cell and the first waterproof layer together, so that the two are bonded together as a whole. The first waterproof layer can prevent water from contacting the double-sided cell, thereby protecting the double-sided cell. The first waterproof layer here can also play an insulating role.

[0008] It is understandable that the welding strips of the bifacial cell are generally white grid lines, while the rest of the cell is generally black, so the white grid lines look very obvious. However, the present application mainly uses a translucent or dark first adhesive film layer to weaken the color of the white grid lines, so that the white grid lines are roughly the same color as the other structures of the bifacial cell, which not only improves the aesthetics of the bifacial solar panel, but also does not affect the penetration of sunlight through the first adhesive film layer, thereby ensuring the efficiency of generating electricity.

[0009] The double-sided solar panel provided by the utility model may also have the following additional technical features:

[0010] In some embodiments, optionally, the bifacial battery cell includes at least one of the following: an IBC (Interdigitated Back Contact) type back contact battery, an ABC (All Back Contact) type back contact battery, and an HPBC (Heterojunction Passivated Back Contact) type back contact battery.

[0011] In this embodiment, the back contact battery includes one of an IBC back contact battery, an ABC back contact battery and an HPBC back contact battery. The BC (Back Contact) back contact battery has good compatibility, high conversion efficiency, and only one side has a welding strip (gate line), so it is more beautiful.

[0012] In some embodiments, optionally, the thickness of the first adhesive film layer is greater than the thickness of the welding tape.

[0013] In this embodiment, the thickness of the first adhesive film layer can be set to be greater than the thickness of the welding tape. In this way, when the first waterproof layer and the double-sided battery cell are bonded together through the first adhesive film layer, the welding tape can be sunken into the first adhesive film layer. The first adhesive film layer can be used to weaken the color of the welding tape and reduce the overall thickness of the double-sided solar panel, making the double-sided solar panel more lightweight.

[0014] In some embodiments, optionally, the thickness of the first adhesive film layer is greater than or equal to 0.2 mm and less than or equal to 0.6 mm; and / or the weight of the first adhesive film layer is greater than or equal to 300 g / m 2 , and less than or equal to 350g / m 2 ; and / or the transmittance of the first film layer is greater than or equal to 30% and less than or equal to 50%; and / or the haze of the first film layer is less than 10%.

[0015] In this embodiment, the thickness of the first adhesive film layer is greater than or equal to 0.2 mm and less than or equal to 0.6 mm; and / or the weight of the first adhesive film layer is greater than or equal to 300 g / m 2 , and less than or equal to 350g / m 2 ; and / or the transmittance of the first adhesive film layer is greater than or equal to 30% and less than or equal to 50%; and / or the haze of the first adhesive film layer is less than 10%. The first adhesive film layer can be prepared using gray EVA (ethylene-vinyl acetate copolymer). Specifically, this is achieved by adding suitable gray pigments or fillers to the ethylene-vinyl acetate raw material, which will be mixed with the EVA resin and evenly dispersed throughout the material, thereby giving the EVA a gray appearance.

[0016] In some embodiments, optionally, the thickness of the bifacial solar panel is greater than or equal to 4 mm and less than or equal to 6 mm.

[0017] In some embodiments, optionally, the thickness of the first protective layer is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

[0018] In this embodiment, the thickness of the first protective layer is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. This configuration can effectively protect the bifacial battery cell and save materials.

[0019] In some embodiments, optionally, the bifacial solar panel further comprises: a fiberglass frame, disposed between the first protective layer and the second protective layer and disposed around the bifacial cell sheet.

[0020] In this embodiment, the bifacial solar panel further includes a fiberglass frame. The fiberglass frame is disposed between the first protective layer and the second protective layer and is disposed around the bifacial cell. The fiberglass frame can enhance the impact resistance of the sides and corners of the bifacial cell. The bifacial cell is embedded in the middle of the fiberglass frame and maintains a spacing of more than 3 mm from the cell. At the same time, handles are designed at both ends of the fiberglass frame to facilitate the installation of the shell material handle for easy carrying.

[0021] In some embodiments, optionally, the bifacial solar panel further comprises: a bus bar connected to the bifacial solar cells; the thickness of the bus bar is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0022] In this embodiment, the bifacial solar panel also includes a bus bar. The bus bar is connected to the bifacial cell sheet, so that the electric energy generated by the bifacial solar panel can be extracted. The thickness of the bus bar is greater than or equal to 0.1 mm and less than or equal to 0.4 mm, which can ensure that the bus bar is sunken into the adhesive film during the hot melt lamination process, so that the step height will not be significantly increased, resulting in the cell being cracked.

[0023] In some embodiments, the width of the busbar can be set according to the product current, for example, 5A current corresponds to a width of more than 3mm, and 10A current corresponds to a width of more than 6mm. The bending area uses a braided copper belt (woven from multiple bundles of fine copper wires), and the circuit connection is welded to the busbars at both ends. The braided copper belt ensures the bendability and anti-fracture characteristics of the bending area.

[0024] In some embodiments, optionally, the busbar is overlapped on the fiberglass frame. In order to ensure that the white color between the thin welding strip and the busbar is not exposed, black EVA needs to be padded between the fiberglass frame and the busbar.

[0025] In some embodiments, the bus bar is optionally a black bus bar.

[0026] In some embodiments, optionally, the first protective layer further includes: a first resistant layer, which is arranged on a side of the first waterproof layer away from the first adhesive film layer; and a second adhesive film layer, which is arranged between the first waterproof layer and the first resistant layer.

[0027] In this embodiment, the first protective layer further includes a first tolerance layer and a second adhesive film layer. The first tolerance layer is arranged on a side of the first waterproof layer away from the first adhesive film layer. The second adhesive film layer is arranged between the first waterproof layer and the first tolerance layer. In this arrangement, the first tolerance layer can play a role of UV resistance and weather resistance, thereby effectively protecting the bifacial battery cell. The second adhesive film layer can enhance the impact resistance of the front side of the battery, so that the bifacial battery cell can withstand stronger impacts.

[0028] In some embodiments, optionally, the sum of the thicknesses of the first adhesive film layer, the first waterproof layer, and the second adhesive film layer is greater than or equal to 1 mm and less than or equal to 2 mm.

[0029] In some embodiments, optionally, the thickness of the first waterproof layer is greater than or equal to 0.3 mm and less than or equal to 0.7 mm; and / or the transmittance of the first waterproof layer is greater than 85%; and / or the first waterproof layer is arranged in contact with the first adhesive film layer, and the bonding force between the first waterproof layer and the first adhesive film layer is greater than 40 N / cm.

[0030] In this embodiment, the thickness of the first waterproof layer is greater than or equal to 0.3 mm and less than or equal to 0.7 mm, which can effectively play the role of water blocking and insulation. The transmittance of the first waterproof layer is greater than 85%, which can ensure that sufficient sunlight is irradiated on the bifacial cell sheet, thereby not affecting the power generation efficiency. The first waterproof layer is arranged in contact with the first adhesive film layer, and the bonding force between the first waterproof layer and the first adhesive film layer is greater than 40N / cm, thereby ensuring that the first waterproof layer is not easy to fall off, thereby improving the stability of the bifacial solar panel.

[0031] In some embodiments, optionally, the second protective layer includes: a third adhesive film layer, arranged on the light-receiving side of the bifacial battery cell; a second resistant layer, arranged on the side of the third adhesive film layer away from the bifacial battery cell; a second waterproof layer, arranged between the third adhesive film layer and the second resistant layer; and a fourth adhesive film layer, arranged between the second resistant layer and the second waterproof layer.

[0032] In this embodiment, the second protective layer includes a third adhesive film layer, a second tolerance layer, a second waterproof layer and a fourth adhesive film layer. The third adhesive film layer is arranged on the light-receiving side of the bifacial cell sheet. The second tolerance layer is arranged on the side of the third adhesive film layer away from the bifacial cell sheet. The second waterproof layer is arranged between the third adhesive film layer and the second tolerance layer. The fourth adhesive film layer is arranged between the second tolerance layer and the second waterproof layer. This arrangement can effectively protect the light-receiving side of the bifacial cell sheet by arranging the third adhesive film layer, the second tolerance layer, the second waterproof layer and the fourth adhesive film layer, so that it has the ability of being waterproof, impact-resistant, UV-resistant and weather-resistant, thereby effectively protecting the bifacial cell sheet.

[0033] In some embodiments, optionally, the thickness of the first protective layer is greater than the thickness of the second protective layer.

[0034] In this embodiment, the thickness of the first protective layer is greater than the thickness of the second protective layer, so that the backlight side of the double-sided solar panel can be effectively protected, and the welding strip on the backlight side can be effectively shielded to make it look less obvious, thereby improving the overall aesthetics of the double-sided solar panel.

[0035] In some embodiments, optionally, the first protective layer and the second protective layer are light-transmitting layers.

[0036] In this embodiment, the first protective layer and the second protective layer are light-transmitting layers, which can effectively ensure that sunlight is incident on the double-sided solar cell, thereby ensuring power generation efficiency.

[0037] In some embodiments, optionally, the thickness of the welding strip is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; and / or the width of the welding strip is greater than or equal to 0.2 mm and less than or equal to 1.2 mm.

[0038] In some embodiments, optionally, the first waterproof layer includes a PET (polyethylene terephthalate) layer; the material of the first resistant layer includes PVDF (polyvinylidene fluoride) and / or ETFE (ethylene-tetrafluoroethylene copolymer); the material of the fourth film layer includes EVA and / or POE (polyolefin elastomer).

[0039] In some embodiments, optionally, the second adhesive film layer and the fourth adhesive film layer are made of the same material, and the first resistant layer and the second resistant layer are made of the same material.

[0040] In some embodiments, the bifacial cell sheet optionally includes a bifacial cell string.

[0041] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 One of the structural schematic diagrams of a double-sided solar panel according to an embodiment of the utility model is shown;

[0044] Figure 2 A partial structural schematic diagram of a double-sided solar panel according to an embodiment of the utility model is shown;

[0045] Figure 3 The second structural schematic diagram of a double-sided solar panel according to an embodiment of the utility model is shown.

[0046] in, Figures 1 to 3The corresponding relationship between the reference numerals and the component names is as follows:

[0047] 1 double-sided battery cell, 10 welding ribbon, 2 first protective layer, 20 first adhesive film layer, 22 first waterproof layer, 24 second adhesive film layer, 26 first tolerance layer, 3 second protective layer, 30 third adhesive film layer, 32 second waterproof layer, 34 fourth adhesive film layer, 36 second tolerance layer, 4 fiberglass frame, 5 bus bar, 6 handle area, 7 power generation area, 8 bending area. DETAILED DESCRIPTION

[0048] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0050] Refer to the following Figures 1 to 3 The invention describes a double-sided solar panel according to some embodiments of the invention.

[0051] According to an embodiment of the first aspect of the present utility model, Figure 1 , Figure 2 and Figure 3 As shown, a bifacial solar panel is proposed, including a bifacial cell 1, a first protective layer 2, a second protective layer 3 and a welding strip 10. The bifacial cell 1 has a light-receiving side and a backlight side opposite to each other, and the backlight side of the bifacial cell 1 has a welding strip 10. The first protective layer 2 is arranged on the backlight side of the bifacial cell 1, and the second protective layer 3 is arranged on the light-receiving side of the bifacial cell 1. The first protective layer 2 includes a first adhesive film layer 20 and a first waterproof layer 22, and the first adhesive film layer 20 is located between the first waterproof layer 22 and the bifacial cell, and the first adhesive film layer 20 is used to bond the bifacial cell 1 and the first waterproof layer 22, and to block part of the light. The first adhesive film layer is a translucent gray adhesive film, and the first adhesive film layer 20 is arranged on the side of the welding strip 10 away from the bifacial cell 1, and the first adhesive film layer 20 can shield the welding strip 10.

[0052] The double-sided solar panel provided by the utility model can generate electricity by receiving sunlight through the front and back surfaces, and can significantly improve the power generation efficiency compared with single-sided products. Specifically, the double-sided solar panel includes a double-sided cell 1, a first protective layer 2, a second protective layer 3 and a welding strip 10. The first protective layer 2 and the second protective layer 3 can protect the double-sided cell 1, thereby preventing the double-sided cell 1 from being damaged. In addition, while protecting the double-sided cell 1, the first protective layer 2 can also shield the welding strip 10 on the backlight side of the double-sided cell 1, so that when the double-sided solar panel is viewed as a whole, the welding strip 10 looks inconspicuous or blocked, thereby improving the overall aesthetics of the double-sided solar panel. Specifically, a first adhesive film layer 20 can be provided in the first protective layer 2, so that the first adhesive film layer 20 is provided on the side of the welding strip 10 away from the double-sided cell 1, so that the first adhesive film layer 20 is used to block part of the light to shield the welding strip 10. When shielding the welding tape 10, the welding tape 10 can be completely shielded by a translucent first adhesive film layer 20, or the welding tape 10 can be shielded by a dark-colored (for example, gray) first adhesive film layer 20, so that the welding tape 10 is roughly the same color as the other parts of the structure of the double-sided battery cell 1. In this way, when viewing the double-sided solar panel as a whole, it is not easy to find the existence of the welding tape 10, making the overall appearance more beautiful. In addition to shielding the welding tape 10, the first adhesive film layer 20 can also bond the double-sided battery cell 1 and the first waterproof layer 22 together, so that the two are bonded together into a whole. The first waterproof layer 22 can prevent water from contacting the double-sided battery cell 1, thereby protecting the double-sided battery cell 1. The first waterproof layer 22 here can also play an insulating role.

[0053] It is understandable that the welding strips 10 of the bifacial cell 1 are generally white grid lines, while the other parts of the cell are generally black, so the white grid lines look very obvious. However, the present application mainly uses the dark first adhesive film layer 20 to weaken the color of the white grid lines, so that the white grid lines are roughly the same color as the other structures of the bifacial cell 1, which not only improves the aesthetics of the bifacial solar panel, but also does not affect the transmission of sunlight from the first adhesive film layer 20, thereby ensuring the efficiency of generating electricity.

[0054] In some embodiments, optionally, the bifacial battery sheet 1 includes at least one of the following: an IBC-type back contact battery, an ABC-type back contact battery, and an HPBC-type back contact battery.

[0055] In this embodiment, the double-sided battery cell 1 includes one of an IBC-type back contact battery, an ABC-type back contact battery and an HPBC-type back contact battery. The BC-type contact battery has good compatibility and high conversion efficiency, and only one side has a welding strip 10 (grid line), so it is more beautiful.

[0056] In some embodiments, optionally, the thickness of the first adhesive film layer 20 is greater than the thickness of the welding ribbon 10 .

[0057] In this embodiment, the thickness of the first adhesive film layer 20 can be set to be greater than the thickness of the welding tape 10. In this way, when the first waterproof layer 22 and the double-sided battery cell 1 are bonded together through the first adhesive film layer 10, the welding tape 10 can be sunken into the first adhesive film layer 20. In this way, the first adhesive film layer 20 can be used to weaken the color of the welding tape 10 and reduce the overall thickness of the double-sided solar panel, making the double-sided solar panel more lightweight.

[0058] In some embodiments, optionally, the thickness of the first adhesive film layer 20 is greater than or equal to 0.2 mm and less than or equal to 0.6 mm; and / or the weight of the first adhesive film layer 20 is greater than or equal to 300 g / m 2 , and less than or equal to 350g / m 2 and / or the transmittance of the first film layer 20 is greater than or equal to 30% and less than or equal to 50%; and / or the haze of the first film layer 20 is less than 10%.

[0059] In this embodiment, the thickness of the first adhesive film layer 20 is greater than or equal to 0.2 mm and less than or equal to 0.6 mm; and / or the weight of the first adhesive film layer 20 is greater than or equal to 300 g / m 2 , and less than or equal to 350g / m 2 ; and / or the transmittance of the first adhesive film layer 20 is greater than or equal to 30% and less than or equal to 50%; and / or the haze of the first adhesive film layer 20 is less than 10%. The first adhesive film layer 20 can be made of gray EVA (ethylene-vinyl acetate copolymer). Specifically, it is achieved by adding suitable gray pigments or fillers to the ethylene-vinyl acetate raw material, which will be mixed with the EVA resin and evenly dispersed in the entire material, thereby giving the EVA a gray appearance.

[0060] In some embodiments, optionally, the first adhesive film layer 20 includes a gray adhesive film.

[0061] In some embodiments, optionally, the gray film has a light transmittance greater than 30% and less than or equal to 50% before thermal cross-linking, a haze less than or equal to 10%, a thickness between 0.4 mm ± 0.1 mm, and a gram weight greater than 320 g / m 2 After thermal cross-linking, the degree of cross-linking is greater than or equal to 70% and less than or equal to 90%. The transmittance is greater than or equal to 40% and less than or equal to 60%.

[0062] In some embodiments, optionally, the thickness of the first adhesive film layer 20 is between 0.4 mm±0.1 mm.

[0063] In some embodiments, optionally, the thickness of the bifacial solar panel is greater than or equal to 4 mm and less than or equal to 6 mm.

[0064] In some embodiments, optionally, the thickness of the bifacial solar panel is between 5 mm ± 0.5 mm.

[0065] In some embodiments, optionally, the thickness of the first protective layer 2 is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

[0066] In this embodiment, the thickness of the first protective layer 2 is greater than or equal to 0.5 mm and less than or equal to 2.5 mm. This configuration can effectively protect the bifacial battery cell 1 and save materials.

[0067] In some embodiments, optionally, the thickness of the first protective layer 2 is between 1.5 mm±0.5 mm.

[0068] In some embodiments, optionally, the bifacial solar panel further includes: a fiberglass frame 4 , which is disposed between the first protective layer 2 and the second protective layer 3 and is disposed around the bifacial cell 1 .

[0069] In this embodiment, the bifacial solar panel further includes a fiberglass frame 4. The fiberglass frame 4 is disposed between the first protective layer 2 and the second protective layer 3 and is disposed around the bifacial cell 1. The fiberglass frame 4 can enhance the impact resistance of the sides and corners of the bifacial cell 1. The bifacial cell 1 is embedded in the middle of the fiberglass frame 4 and maintains a spacing of more than 3 mm from the cell. At the same time, handles are designed at both ends of the fiberglass frame to facilitate the installation of the shell material handle for easy carrying.

[0070] In some embodiments, optionally, the bifacial solar panel further comprises: a bus bar 5 connected to the bifacial cell 1; the thickness of the bus bar 5 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0071] In this embodiment, the bifacial solar panel further includes a bus bar 5. The bus bar 5 is connected to the bifacial cell 1, so that the electric energy generated by the bifacial solar panel can be extracted. The thickness of the bus bar 5 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm, which can ensure that the bus bar 5 is sunken into the adhesive film during the hot melt lamination process, so that the step height will not be significantly increased, resulting in the cell being crushed.

[0072] In some embodiments, the width of the busbar 5 can be set according to the product current, for example, a current of 5A corresponds to a width of more than 3mm, and a current of 10A corresponds to a width of more than 6mm. The bending area 8 uses a braided copper belt (woven from multiple bundles of fine copper wires), and the circuit connection is welded to the busbars 5 at both ends. The braided copper belt ensures the bendability and anti-fracture characteristics of the bending area 8.

[0073] In some embodiments, optionally, the busbar 5 is overlapped on the glass fiber frame 4 , and in order to ensure that the white color between the thin welding strip 10 and the busbar 5 is not exposed, black EVA needs to be padded between the glass fiber frame 4 and the busbar 5 .

[0074] In some embodiments, optionally, the bus bar 5 is a black bus bar 5 .

[0075] In some embodiments, optionally, the first protective layer 2 further includes: a first resistance layer 26 disposed on a side of the first waterproof layer 22 away from the first adhesive film layer 20 ; and a second adhesive film layer 24 disposed between the first waterproof layer 22 and the first resistance layer 26 .

[0076] In this embodiment, the first protective layer 2 also includes a first tolerance layer 26 and a second adhesive film layer 24. The first tolerance layer 26 is arranged on the side of the first waterproof layer 22 away from the first adhesive film layer 20. The second adhesive film layer 24 is arranged between the first waterproof layer 22 and the first tolerance layer 26. This arrangement can prevent water from contacting the bifacial battery cell 1 by setting the first waterproof layer 22, thereby protecting the bifacial battery cell 1. The first waterproof layer 22 here can also play an insulating role. The first tolerance layer 26 can play a role of UV resistance and weather resistance, thereby effectively protecting the bifacial battery cell 1. The second adhesive film layer 24 can enhance the impact resistance of the front side of the battery, so that the bifacial battery cell 1 can withstand stronger impacts.

[0077] In some embodiments, optionally, the sum of the thicknesses of the first adhesive film layer 20 , the first waterproof layer 22 , and the second adhesive film layer 24 is greater than or equal to 1 mm and less than or equal to 2 mm.

[0078] In some embodiments, optionally, the thickness of the first waterproof layer 22 is greater than or equal to 0.3 mm and less than or equal to 0.7 mm; and / or the transmittance of the first waterproof layer 22 is greater than 85%; and / or the first waterproof layer 22 is arranged in contact with the first adhesive film layer 20, and the bonding force between the first waterproof layer 22 and the first adhesive film layer 20 is greater than 40 N / cm.

[0079] In this embodiment, the thickness of the first waterproof layer 22 is greater than or equal to 0.3 mm and less than or equal to 0.7 mm, which can effectively play the role of water blocking and insulation. The transmittance of the first waterproof layer 22 is greater than 85%, which can ensure that sufficient sunlight is irradiated on the bifacial cell 1, so as not to affect the power generation efficiency of the power generation area 7. The first waterproof layer 22 is arranged in contact with the first adhesive film layer 20, and the bonding force between the first waterproof layer 22 and the first adhesive film layer 20 is greater than 40N / cm, so as to ensure that the first waterproof layer 22 is not easy to fall off, thereby improving the stability of the bifacial solar panel.

[0080] In some embodiments, optionally, the second protective layer 3 includes: a third adhesive film layer 30, which is arranged on the light-receiving side of the bifacial battery cell 1; a second resistant layer 36, which is arranged on the side of the third adhesive film layer 30 away from the bifacial battery cell 1; a second waterproof layer 32, which is arranged between the third adhesive film layer 30 and the second resistant layer 36; and a fourth adhesive film layer 34, which is arranged between the second resistant layer 36 and the second waterproof layer 32.

[0081] In this embodiment, the second protective layer 3 includes a third adhesive film layer 30, a second resistant layer 36, a second waterproof layer 32 and a fourth adhesive film layer 34. The third adhesive film layer 30 is arranged on the light-receiving side of the bifacial cell 1. The second resistant layer 36 is arranged on the side of the third adhesive film layer 30 away from the bifacial cell 1. The second waterproof layer 32 is arranged between the third adhesive film layer 30 and the second resistant layer 36. The fourth adhesive film layer 34 is arranged between the second resistant layer 36 and the second waterproof layer 32. This arrangement, by arranging the third adhesive film layer 30, the second resistant layer 36, the second waterproof layer 32 and the fourth adhesive film layer 34, can effectively protect the light-receiving side of the bifacial cell 1, so that it has the ability of being waterproof, impact-resistant, UV-resistant and weather-resistant, thereby effectively protecting the bifacial cell 1.

[0082] In some embodiments, optionally, the thickness of the first protective layer 2 is greater than the thickness of the second protective layer 3 .

[0083] In this embodiment, the thickness of the first protective layer 2 is greater than the thickness of the second protective layer 3, so that the backlight side of the double-sided solar panel can be effectively protected, and the welding strip 10 on the backlight side can be effectively shielded to make it look less obvious, thereby improving the overall aesthetics of the double-sided solar panel.

[0084] In some embodiments, optionally, the first protective layer 2 and the second protective layer 3 are light-transmitting layers.

[0085] In this embodiment, the first protective layer 2 and the second protective layer 3 are light-transmitting layers, which can effectively ensure that sunlight is incident on the double-sided solar cell 1, thereby ensuring power generation efficiency.

[0086] In some embodiments, optionally, the thickness of the soldering ribbon 10 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; and / or the width of the soldering ribbon 10 is greater than or equal to 0.2 mm and less than or equal to 1.2 mm.

[0087] In some embodiments, optionally, the first waterproof layer 22 includes a PET layer; the material of the first resistant layer 26 includes PVDF and / or ETFE; and the material of the fourth adhesive film layer 34 includes EVA and / or POE.

[0088] In some embodiments, optionally, the second adhesive film layer 24 and the fourth adhesive film layer 34 are made of the same material, and the first resistant layer 26 and the second resistant layer 36 are made of the same material.

[0089] In some embodiments, optionally, the bifacial cell sheet 1 includes a bifacial cell string.

[0090] According to an embodiment of the first aspect of the utility model, a double-sided solar panel is proposed, and its structure is arranged from the front to the back in sequence: ETFE / PVDF+adhesive film+transparent PET+adhesive film+battery+fiberglass frame 4+gray adhesive film+transparent PET+adhesive film+ETFE / PVDF. Among them, the battery is preferably a BC-type back-junction back-contact battery such as IBC / ABC / HPBC, and there is no white grid line (welding strip 10) on the front side (light-receiving side) of the battery. A gray adhesive film (first adhesive film layer 20) is used on the back side (backlight side) of the double-sided solar panel instead of a transparent adhesive film to cover the back side of the battery. The back protective layer uses thickened PET for electrical insulation and protection. The lines in the back battery area use flat black bus bars 5 for circuit routing.

[0091] In this structural design, the front side (front light-receiving side) material is generally PVDF or ETFE, which mainly plays the role of UV resistance and weather resistance.

[0092] The front protective layer of the battery is composed of film + PET + EVA. The film is generally transparent EVA and POE. The transparent PET is mainly used to enhance the impact resistance of the front of the battery and try not to block the light transmission. The number of PET layers can be multi-layered and can be adjusted according to the thickness of PET and the toughness of the product. 1 layer is preferred.

[0093] The battery is an IBC type battery, preferably with a size of 166mm×166mm. Laser-cut half-sheets are used between the batteries to meet the series voltage and anti-hot spot design, and seamless lap welding technology is used. There is an overlapping area between the batteries to avoid exposure of the white welding strip 10.

[0094] The fiberglass frame 4 is mainly used to enhance the impact resistance of the sides and corners. The battery is embedded in the middle of the fiberglass frame 4, maintaining a distance of more than 3mm from the battery. At the same time, handle areas 6 are designed at both ends of the frame to facilitate the installation of shell materials. The handles are provided for easy carrying. The bus bar 5 is overlapped on the fiberglass frame 4. In order to ensure that the white color between the thin welding strip 10 and the bus bar 5 is not exposed, black EVA needs to be padded between the fiberglass frame 4 and the bus bar 5. The bus bar 5 uses a black bus bar 5.

[0095] Gray film + thickened PET + film + ETFE / PVDF constitute the back protection layer of the product:

[0096] The total thickness of the gray film, thickened PET and film is 1.5mm±0.5mm, and the total thickness of the product is about 5mm±0.5mm.

[0097] Gray EVA is preferably used for the gray film, which is achieved by adding suitable gray pigments or fillers to the ethylene vinyl acetate raw material. They will mix with the EVA resin and evenly disperse throughout the material, thus giving the EVA a gray appearance. The gray EVA used in this embodiment has a thickness of 0.4 mm ± 0.1 mm and a gram weight of 300 g / m 2 ~350g / m 2 The transmittance is between 35% and 50%, and the haze is less than 10%. The gray EVA also has a buffering effect. After the adhesive film is hot-melted, it flows to cover the bus bar 5 to prevent the lamination pressure from fracturing the battery under the bus bar 5.

[0098] The thickness of the thickened PET is between 0.58mm±10%mm, the transmittance is greater than 85%, the surface adhesion to EVA is greater than 40N / cm, and it can block water and have insulation effects.

[0099] The material and function of the back film and ETFE / PVDF are the same as those of the front film and ETFE / PVDF.

[0100] Back contact battery back side Figure 2 As shown:

[0101] After the battery is laser cut into half pieces, it is stacked and welded. The positive and negative electrodes on the back of the battery are serially welded through white fine grid wire welding strips 10, and then led out to the edge bus bar 5. The fine welding strips 10 are generally white, with a thickness between 0.16mm and 0.2mm and a width between 0.7mm±0.3mm.

[0102] The back side (backlight side) of a bifacial solar panel is structured as follows: Figure 3 As shown:

[0103] There is a long busbar 5 lead-out line between the battery strings on the back of the double-sided solar panel, and another lead-out line is close to the handle area 6. Both busbars 5 are black busbars 5, and the thickness of the busbar 5 is 0.15mm-0.25mm, which is lower than the gray film 0.38mm. This can ensure that the busbar 5 is sunken into the film during the hot melt lamination process, so that the step height will not be significantly increased, causing the battery to be cracked. The width is set according to the current of the double-sided solar panel, for example, 5A corresponds to a width of more than 3mm, and 10A corresponds to a width of more than 6mm. The bending area 8 still uses a braided copper belt (woven from multiple bundles of fine copper wires), and the circuit connection is welded to the busbars 5 at both ends. The braided copper belt ensures the bendability and anti-fracture characteristics of the bending area 8.

[0104] The beneficial effects of the double-sided solar panels of this application:

[0105] 1. The power generation efficiency on the front side (light-receiving side) is not affected, and the appearance of the all-black component is met. The product can generate electricity on both sides and achieve power generation gain.

[0106] 2. After the gray film (first film layer 20) is hot-melted, the transmittance is still 50%. At the same time, the white grid lines of the back (backlight side) cells are weakened, the color difference contrast between the grid lines and the non-grid line areas is reduced, and the aesthetics of the solar panel is improved.

[0107] 3. Thickened PET (first waterproof layer 22) improves product toughness and electrical protection, preventing battery cells from being damaged due to falling or collision.

[0108] 4. Use black busbars 5 to replace braided copper tapes to avoid adding extra black adhesive film to cover up the white busbars 5 and welding tapes 10. At the same time, use flat busbars 5 to avoid the braided copper tape being too thick during the lamination process, thereby causing excessive stress on the battery cell to cause cracks.

[0109] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0110] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0111] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-sided solar panel, characterized in that: include: A bifacial cell having a light-receiving side and a backlight side opposite to each other; A first protective layer is provided on the backlight side of the bifacial cell sheet, the first protective layer comprising a first adhesive film layer and a first waterproof layer, the first adhesive film layer is used to bond the bifacial cell sheet and the first waterproof layer, and block part of the light; A welding strip, the welding strip being located between the first adhesive film layer and the backlight side of the double-sided battery cell; The second protective layer is arranged on the light-receiving side of the double-sided cell.

2. The double-sided solar panel according to claim 1, characterized in that: The thickness of the first adhesive film layer is greater than the thickness of the welding strip.

3. The double-sided solar panel according to claim 1, characterized in that: The thickness of the first adhesive film layer is greater than or equal to 0.2 mm and less than or equal to 0.6 mm; and / or The weight of the first adhesive film layer is greater than or equal to 300 g / m 2 , and less than or equal to 350g / m 2 ; and / or The transmittance of the first adhesive film layer is greater than or equal to 30% and less than or equal to 50%; and / or The haze of the first adhesive film layer is less than 10%.

4. The double-sided solar panel according to claim 1, characterized in that: The thickness of the bifacial solar panel is greater than or equal to 4 mm and less than or equal to 6 mm; and / or The thickness of the first protective layer is greater than or equal to 0.5 mm and less than or equal to 2.5 mm.

5. The double-sided solar panel according to claim 1, characterized in that: Also includes: The fiberglass frame is disposed between the first protective layer and the second protective layer and surrounds the double-sided battery sheet.

6. The double-sided solar panel according to claim 1, characterized in that: Also includes: A bus bar connected to the double-sided battery sheet; The bus bar has a thickness greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

7. The double-sided solar panel according to any one of claims 1 to 6, characterized in that: The first protective layer further comprises: A first resistant layer is arranged on a side of the first waterproof layer away from the first adhesive film layer; The second adhesive film layer is arranged between the first waterproof layer and the first resistance layer.

8. The double-sided solar panel according to claim 7, characterized in that: The sum of the thicknesses of the first adhesive film layer, the first waterproof layer and the second adhesive film layer is greater than or equal to 1 mm and less than or equal to 2 mm.

9. The double-sided solar panel according to any one of claims 1 to 6, characterized in that: The second protective layer comprises: A third adhesive film layer is provided on the light-receiving side of the double-sided cell sheet; A second tolerance layer is arranged on a side of the third adhesive film layer away from the double-sided battery sheet; A second waterproof layer, disposed between the third adhesive film layer and the second resistant layer; The fourth adhesive film layer is arranged between the second resistance layer and the second waterproof layer.

10. The double-sided solar panel according to claim 9, characterized in that: The thickness of the first protective layer is greater than the thickness of the second protective layer.

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