Double-glass solar cell module and photovoltaic system

Abstract

The utility model relates to the technical field of solar cells, and discloses a double-glass solar cell module and a photovoltaic system, isolation strips are arranged on a cell layer, and the isolation strips comprise a first isolation strip, a second isolation strip and a third isolation strip; the first isolating bar is arranged at the upper side edge and / or the lower side edge of the backlight surface of the solar cell along a first direction; the second isolating bar is arranged on one side, far away from the solar cell, of the bus bar along the first direction, and the second isolating bar completely covers the bus bar; and the third isolating strip is arranged at the left side edge and / or the right side edge of the backlight surface of the solar cell string along the second direction, so that all cell piece gaps, cell string gaps, peripheral blank areas, bus bars, solder strips and other areas can be covered from the front side to form a plurality of light leakage prevention areas, the cost is reduced, and the production efficiency is improved. And the shading requirements of more typeset battery piece layers are met.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a double-glass solar cell assembly and a photovoltaic system. Background Art

[0002] Double-glass solar panels are photovoltaic modules encapsulated with double layers of glass. They primarily consist of solar cells, a glass front panel, a front film, a back film, and a glass back panel. When the front, back, and front films of a solar panel are all transparent, the bifaciality of the module can be significantly increased, boosting its actual power generation capacity. However, within the cell layer, there are blank areas between cells, between cell strings and busbars, and around the periphery of the cell strings. Double-glass panels constructed directly with transparent back glass experience significant light leakage, reducing the amount of light energy received by the cells and, consequently, lowering their conversion efficiency.

[0003] In the prior art, a black glaze layer is provided at the projection position of these blank areas on the inner side of the back glass to reduce the possibility of light leakage of the cell, thereby completely eliminating the risk of light leakage. Figure 1 However, the method of reducing light leakage by setting a black glaze layer on the back panel still has the following problems: First, the glaze layer is set on the inner side of the back glass, and it is technically difficult to maintain long-term weather resistance, which will increase the cost of the double-glass solar cell module by about 4 yuan / m 2 ; Second, after the black glaze layer is set in the back panel, the black anti-light leakage area is fixed and difficult to fine-tune. If the layout size of the battery layer changes slightly, it is necessary to redesign and produce an appropriate glazed glass back panel to avoid the risk of light leakage. Therefore, the existing glazed glass back panel cannot be used for more layouts of battery layers. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a double-glass solar cell assembly, in which the anti-light leakage area formed can be flexibly adjusted according to the layout of the battery layer, thereby reducing the cost, and the appearance color of the light-receiving surface is consistent and beautiful.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a double-glass solar cell module, comprising a glass front plate, a front adhesive film layer, a cell layer, a rear adhesive film layer and a glass back plate stacked in sequence from top to bottom.

[0006] The cell layer includes a plurality of solar cell strings, wherein the plurality of solar cell strings are connected by bus bars, and a bus bar is provided at the head end or the tail end of the solar cell string; the bus bar is provided on each solar cell string including a plurality of solar cells, wherein the plurality of solar cells are connected by welding ribbons;

[0007] Isolation bars are provided on the battery layer, and the isolation bars include a first isolation bar, a second isolation bar and a third isolation bar;

[0008] The first isolation strip is arranged at the upper edge and / or the lower edge of the backlight surface of the solar cell along the first direction;

[0009] The second isolation bar is arranged on a side of the bus bar away from the solar cell along the first direction, and the second isolation bar completely covers the bus bar;

[0010] The third isolation strip is arranged along the second direction at a left edge and / or a right edge of the backlight surface of the solar cell string.

[0011] As an improvement to the above solution, the length of the first isolation strip is less than or equal to the length of the solar cell.

[0012] As an improvement to the above solution, there is a gap between adjacent solar cells in each solar cell string, and the first isolation strip is arranged in the gap between adjacent solar cells. The first isolation strip completely covers the gap, and the overlapping width of the first isolation strip and the solar cell is 1 mm to 10 mm.

[0013] As an improvement to the above solution, the welding ribbon connects the solar cells along the second direction to form the head end and the tail end of the solar cell string, the first isolation strip is provided on the solar cells located at the head end and the tail end, and the distance between the side of the first isolation strip away from the solar cell and the edge of the solar cell in the second direction is 1 mm to 10 mm.

[0014] As an improvement to the above solution, the soldering ribbon is located on the backlight side of the solar cell layer, and the first isolation strip is located on a side of the soldering ribbon close to the solar cell.

[0015] As an improvement to the above solution, the length of the second isolation strip is less than the length of the double-glass solar cell assembly in the first direction, and the length of the second isolation strip is greater than the total length of the cell layer in the first direction.

[0016] As an improvement to the above solution, the width of the second isolation bar is greater than the width of the bus bar.

[0017] As an improvement to the above solution, the distance between the second isolation strip on one side close to the solar cell and the adjacent solar cell in the second direction is 0 mm to 5 mm;

[0018] A distance between a side of the second isolation bar away from the solar cell and a side of the bus bar away from the solar cell in the second direction is 2 mm to 10 mm.

[0019] As an improvement to the above solution, the second isolation strip is in contact with the first isolation strip, and the overlap width of the second isolation strip on the side close to the solar cell in the second direction with the first isolation strip is 0.5 mm to 5 mm.

[0020] As an improvement to the above solution, the length of the third isolation strip is greater than the length of the solar cell string in the second direction;

[0021] The length of the third isolation strip is smaller than the length of the double-glass solar cell assembly in the second direction.

[0022] As an improvement to the above solution, there are gaps between adjacent solar cell strings, the third isolation strips are located in the gaps between adjacent solar cell strings, and the width of the third isolation strips is greater than the width of the gaps between adjacent solar cell strings.

[0023] As an improvement to the above solution, the overlapping width of the third isolation strip and the solar cell strings located on both sides thereof is 0.5 mm to 15 mm;

[0024] As an improvement to the above solution, a blank area exists between the solar cell string and the double-glass solar cell assembly in the second direction, and the third isolation strip completely covers the blank area.

[0025] As an improvement to the above solution, the color of the front surface of the isolation strip is similar to the color of the light-receiving surface of the battery layer.

[0026] As an improvement to the above solution, an infrared reflective coating layer and / or an anti-ultraviolet coating layer is provided on the light-receiving surface of the isolation strip.

[0027] As an improvement to the above solution, the glass back panel is a glass back panel without a glaze layer;

[0028] Alternatively, the glass back panel is a glass back panel partially provided with a glaze layer.

[0029] The second aspect of the present invention further provides a photovoltaic system, comprising the double-glass solar cell assembly.

[0030] The implementation of this utility model has the following beneficial effects:

[0031] In the present invention, a first isolation strip, a second isolation strip and a third isolation strip are arranged on the battery cell layer, which can cover all battery cell gaps, battery string gaps, peripheral blank areas, bus bars and welding strips and other areas from the front, forming multiple anti-light leakage areas, preventing light from passing through these areas and reducing the light energy that should be absorbed by the battery, effectively reducing the risk of light leakage, and can be used to replace the use of traditional glass backplanes with a glaze layer, thereby reducing the performance requirements of the glass backplane and the glaze layer materials, reducing costs, and at the same time eliminating the impact of the 411 color difference between the rear film and the backplane on the front appearance, which can meet the light shading needs of more layouts of battery cell layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : A schematic structural diagram of the light-receiving surface of a double-glass solar cell module with a glaze layer provided inside the back glass in the prior art;

[0033] Figure 2 : Schematic diagram of the structure of the double-glass solar cell module in the utility model;

[0034] Figure 3 : A schematic structural diagram of the backlight surface of the battery layer in the present invention;

[0035] Figure 4 : A schematic structural diagram of the backlight surface of the battery layer in the present invention;

[0036] Figure 5 : A schematic diagram of the structure of the first isolation strip disposed on the backlight surface of the solar cell in the present invention;

[0037] Figure 6 : Figure 5 A partial enlarged view of area A in the middle;

[0038] Figure 7 : A schematic structural diagram of the backlight surface of the solar cell after the second isolation strip is set in the utility model;

[0039] Figure 8 : Figure 7 A partial enlarged view of the middle B area;

[0040] Figure 9 : Figure 7 A partial enlarged view of the middle C area;

[0041] Figure 10 : A schematic structural diagram of the backlight surface of the solar cell after the second isolation strip is set in the utility model;

[0042] Figure 11 : Figure 10 A partial magnified view of area D in the middle.

[0043] Reference numerals:

[0044] 1-black glaze layer; 2-glass front panel; 3-front adhesive film layer; 4-cell layer; 41-solar cell string; 411-solar cell; 5-rear adhesive film layer; 6-glass back panel; 7-bus bar; 8-solder ribbon; 9-isolator bar; 91-first isolator bar; 92-second isolator bar; 93-third isolator bar. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail with reference to specific embodiments below.

[0046] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. In addition, it should be understood that the specific embodiments described herein are merely used to explain the present application and are not intended to limit the present application.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "back", "front", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0048] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art will appreciate the application of other processes and / or the use scenarios of other materials.

[0050] References herein to "embodiments" or "implementations" mean that a particular feature, component, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] In order to solve the above problems, the first aspect of the present invention provides a double-glass solar cell module, such as Figure 2 As shown, it includes a glass front plate 2, a front adhesive film layer 3, a battery layer 4, a rear adhesive film layer 5 and a glass back plate 6 which are stacked in sequence from top to bottom.

[0052] like Figure 3 and Figure 4 As shown, the cell layer 4 includes a plurality of solar cell strings 41, and the plurality of solar cell strings 41 are connected by bus bars 7. Moreover, a bus bar 7 is provided at the head end or the tail end of the solar cell string 41; the bus bar 7 is provided on each solar cell string 41 and includes a plurality of solar cells 411, and the plurality of solar cells 411 are connected by welding strips 8.

[0053] Isolation bars 9 are provided on the battery layer 4, and the isolation bars 9 include a first isolation bar 91, a second isolation bar 92 and a third isolation bar 93;

[0054] The first isolation strip 91 is provided along a first direction at an upper edge and / or a lower edge of the backlight surface of the solar cell 411;

[0055] The second isolation bar 92 is disposed along the first direction on a side of the bus bar 7 away from the solar cell 411 , and the second isolation bar 92 completely covers the bus bar 7 ;

[0056] The third isolation bar 93 is disposed along the second direction at the left edge and / or the right edge of the backlight surface of the solar cell string 41 .

[0057] In the present invention, a first isolation strip 91, a second isolation strip 92 and a third isolation strip 93 are provided on the cell layer 4, which can cover all cell gaps, cell string gaps, peripheral blank areas, bus bars 7 and welding strips 8 and other areas from the front, forming multiple anti-light leakage areas, preventing light from passing through these areas and reducing the light energy that should be absorbed by the battery, effectively reducing the risk of light leakage, and can be used to replace the use of a traditional glass back panel 6 with a glaze layer, thereby reducing the performance requirements of the glass back panel 6 and the glaze layer material, reducing costs, and at the same time eliminating the influence of the color difference between the rear adhesive film and the back panel on the front appearance.

[0058] It can be understood that the double-glass solar cell assembly also includes a frame, which serves as the main external support structure of the entire back-contact solar cell assembly and can stably support and install the double-glass solar cell assembly. For example, the frame can be a metal frame, and the double-glass solar cell assembly can be installed at the required installation position through the metal frame.

[0059] Preferably, the first isolation strip 91 is arranged on the backlight surface of the solar cell 411, and can form a light leakage prevention area at the gap of the solar cell 411, so as to reduce the light passing through the gap of the solar cell 411, and at the same time will not block the light receiving area of ​​the solar cell, thereby protecting the battery conversion efficiency to a greater extent.

[0060] Specifically, if Figure 5 As shown, gaps exist between adjacent solar cells 411 in each solar cell string 41. First spacer bars 91 are positioned in the gaps between adjacent solar cells 411. The first spacer bars 91 completely cover the gaps, completely obscuring all gaps between adjacent solar cells 411 when viewed from the front. This reduces light reflection or refraction from the solar cells 411 through the gaps between adjacent solar cells 411. The overlap width between the first spacer bars 91 and the solar cells 411 is 1 mm to 10 mm. This further reduces light reflection or refraction at the gaps connecting the solar cells 411 and the first spacer bars 91, preventing it from being absorbed by the solar cells 411 in the cell layer 4. Exemplary overlap widths between the first spacer bars 91 and the solar cells 411 include, but are not limited to, 1 mm, 1.5 mm, 2.5 mm, 3.5 mm, 4.5 mm, 5.5 mm, 6.5 mm, 7.5 mm, 8.5 mm, 9.5 mm, or 10 mm.

[0061] Alternatively, as Figure 6 As shown, the length of the first isolation strip 91 is less than or equal to the length of the solar cell 411. The length of the first isolation strip 91 is L1, and the length of the solar cell 411 is L2. When L1 is less than or equal to L2, each solar cell can be independently shaded, facilitating appropriate adjustments when the layout structure of the solar cell layer 4 is adjusted. Furthermore, while completely blocking light in the gaps between the solar cells, the overlap area with the third isolation strip 93 can be reduced, further reducing production costs. It is understood that the length L1 of the first isolation strip 91 being less than or equal to the length L2 of the solar cell 411 means that the length L1 of the first isolation strip 91 is slightly smaller than the length L2 of the solar cell 411. If the value of L1 is too small, the shading effect in the gaps between adjacent solar cells 411 cannot be guaranteed.

[0062] Furthermore, the welding ribbon 8 connects the solar cell 411 along the second direction to form the head end and the tail end of the solar cell string 41, and the first isolation strip 91 is provided on the solar cell 411 located at the head end and the tail end. There is a gap between the solar cell 411 at the head end and the solar cell 411 at the tail end and the bus bar 7, respectively. The solar cell 411 at the head end of the solar cell string 41 is provided with the first isolation strip 91 at the upper edge of the solar cell 411, and the solar cell 411 at the tail end of the solar cell string 41 is provided with the first isolation strip 91 at the lower edge of the solar cell 411, so that the upper and lower edges of the solar cell 411 can be shielded from light by the blank processing. Processing is performed to realize the surrounding arrangement of the solar cell 411 in the first direction to avoid light leakage in the first direction of the solar cell 411. The distance between the side of the first isolation strip 91 away from the solar cell 411 and the edge of the solar cell 411 in the second direction is W1. W1 can be reasonably adjusted according to the width of the gap between the solar cell 411 at the head end and the tail end and the bus bar 7, so that the first isolation strip 91 partially overlaps with the solar cell 411 and exceeds the edge of the solar cell 411 to achieve the effect of preventing light leakage. More preferably, W1 is 1 mm to 10 mm. W1 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, but is not limited thereto.

[0063] In some embodiments, the soldering ribbon 8 is located on the backlight side of the cell layer 4, and the first isolation strip 91 is located on the side of the soldering ribbon 8 closest to the solar cell 411. That is, after the first isolation strip 91 is provided on the backside of the cell layer 4, the soldering ribbon 8 is used to connect the solar cell strings 41. When viewed from the front, the first isolation strip 91 not only completely blocks the gaps between adjacent solar cells 411, but also completely blocks the gaps between the soldering ribbon 8 and the solar cell 411, further improving the light leakage prevention effect.

[0064] Preferably, if Figure 7 As shown, the second isolation bars 92 are disposed on the light-receiving surface of the solar cell 411, and the second isolation bars 92 are located on and completely cover the bus bar 7, forming multiple light leakage-proof areas. From the light-receiving surface of the solar cell 411, the second isolation bars 92 can completely cover the blank areas around the bus bar 7, preventing sunlight from passing through and leaking around the bus bar 7. It is understood that the bus bar 7 specifically includes bus bars 7 located at three positions: the head end, the tail end, and between adjacent solar cell strings 41 of the cell layer 4, and the second isolation bars 92 are located on the bus bar 7, that is, the second isolation bars 92 include second isolation bars 92 located at three positions: the head end, the tail end, and between adjacent solar cell strings 41 of the cell layer 4. In some embodiments, in the second direction, the battery cells between adjacent battery strings are stacked in sequence, and the bus bar 7 is arranged at the stacking position of the adjacent battery strings and is in direct contact with the battery cells. At this time, the second isolation bar 92 may not be provided at this position, that is, the second isolation bar 92 includes the second isolation bar 92 located at the head end and the tail end of the battery cell layer 4.

[0065] Furthermore, the length of the second isolation strip 92 is less than the length of the double-glass solar cell assembly in the first direction. The length of the second isolation strip 92 is L3, and the length of the double-glass solar cell assembly in the first direction is L4. L3 < L4 prevents light emitted from the cell layer 4 through refraction or reflection from escaping through the blank area surrounding the assembly, causing irreversible light loss. It should be noted that L3 < L4 here means that L3 is slightly less than L4. If the value of L3 is too small, the shading effect at the gap between adjacent solar cells 411 cannot be guaranteed. When L3 is greater than L4, it increases costs and can also cause the second isolation strip 92 at the corners that contact the frame to warp during assembly packaging and pressing, which increases the possibility of light leakage.

[0066] The length of the second isolation strips 92 is greater than the total length of the cell layer 4 in the first direction. The total length of the cell layer 4 in the first direction is L5, where L3>L5. Together with the first isolation strips 91, they provide omnidirectional light shielding for the solar cells 411. It should be noted that L3>L5 here means that L3 is slightly greater than L5. Excessively large L3 values ​​will also increase costs. If L3<L5, the light shielding effect at the gaps between adjacent solar cells 411 cannot be guaranteed.

[0067] Furthermore, the width of the second isolation bar 92 is greater than the width of the busbar 7. The distance between the side of the second isolation bar 92 away from the solar cell 411 and the side of the busbar 7 away from the solar cell 411 in the second direction is 2mm to 10mm. The distance between the side of the second isolation bar 92 away from the solar cell 411 and the side of the busbar 7 away from the solar cell 411 in the second direction is W2, W2 = 2mm to 10mm, so that the second isolation bar 92 completely covers the side of the busbar 7 away from the solar cell 411 and exceeds 2mm to 10mm, and also shields the blank area between the busbar 7 and the frame, further improving the anti-light leakage performance in the busbar 7 area. W2 can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, but is not limited to this.

[0068] Furthermore, the distance between the second isolation strip 92 and the adjacent solar cell 411 in the second direction on the side close to the solar cell 411 is 1mm to 5mm; the distance between the second isolation strip 92 and the adjacent solar cell 411 in the second direction on the side close to the solar cell 411 is W3, where W3 = 0mm to 5mm. Combined with W1, this can shield the blank areas of the solar cells 411 at the head and tail ends of the solar cell string 41, eliminating the effect of the busbar 7 on the light leakage of the double-glass solar cell assembly caused by the blank areas around the solar cells 411. W3 can be, for example, 0mm, 1mm, 2mm, 3mm, 4mm, or 5mm, but is not limited thereto. It is understood that in order to ensure that the second isolation strip 92 can completely block the blank areas outside the double-glass solar cell assembly on the same side, the second isolation strips 92 on both the head and tail ends can be appropriately widened outward.

[0069] It is understood that the shape of the solar cell 411 can be square or rounded. The corners of the solar cell 411 are not completely shielded, making light leakage very likely, especially for solar cells 411 with rounded corners. In some embodiments, the second isolation bar 92 contacts the first isolation bar 91. The overlap width of the second isolation bar 92 on the side closest to the solar cell 411 in the second direction with the first isolation bar 91 is 0.5 mm to 5 mm. This can achieve light shielding at the corners of the solar cell 411, preventing light leakage from the corners of the solar cell 411. In addition, the width of the second isolation bar 92 can be designed to reduce the shading of the light-receiving area of ​​the solar cell 411, further improving the photoelectric conversion efficiency of the double-glass solar cell module. The overlap width of the second isolation bar 92 on the side closest to the solar cell 411 in the second direction with the first isolation bar 91 can be, for example, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, but is not limited thereto.

[0070] Preferably, the third isolation strips 93 are disposed along the second direction on the backlight surface of the solar cell strings 41. Specifically, the third isolation strips 93 are located at three locations: the gaps between adjacent solar cell strings 41, the side of the leftmost solar cell string 41 away from the solar cell strings 41, and the side of the rightmost solar cell string 41 away from the solar cell strings 41, thereby forming areas to prevent light leakage. When used in conjunction with the first isolation strips 91, when the glass backplane 6 is not glazed, the blank areas between the solar cell strings 41 and the left and right solar cell strings 41 can be shielded. In conjunction with the first isolation strips 91, the solar cells 411 are fully shielded, ensuring that no light leaks between the solar cell strings 41.

[0071] Furthermore, the length of the third isolation strip 93 is greater than the length of the solar cell string 41 in the second direction; the length of the third isolation strip 93 is L6, and the length of the solar cell string 41 in the second direction is L7, where L6>L7. It should be noted that L6>L7 here means that L6 is slightly greater than L7. If the value of L6 is too large, the overlap with the second isolation strip 92 will increase, thereby increasing costs. If L6<L7, the shading effect at the corners of adjacent solar cell strings 41 cannot be guaranteed. The length of the third isolation strip 93 is less than the length of the double-glass solar cell module in the second direction. The length of the double-glass solar cell module in the second direction is L8. L6<L8. It should be noted that L6<L8 here means that L6 is slightly less than L8. If the value of L6 is too small, the blank area between the solar cell layer 4 and the frame will increase, thereby increasing the possibility of light leakage. If the value of L6 is too large, the second isolation strip 92 at the corners contacting the frame will be easily warped during module packaging and pressing, which in turn increases the possibility of light leakage.

[0072] Furthermore, gaps exist between adjacent solar cell strings 41. The third isolation bars 93 are located in the gaps between adjacent solar cell strings 41. The width of the third isolation bars 93 is greater than the width of the gaps between adjacent solar cell strings 41. The width of the third isolation bars 93 is W4, and the width of the gaps between adjacent solar cell strings 41 is W5, where W4>W5. In some embodiments, the overlap width between the third isolation bars 93 and the solar cell strings 41 on either side thereof is 0.5 mm to 15 mm, ensuring that the gaps between the solar cell cells 411 that are not blocked due to the first isolation bars 91 being slightly shorter than the solar cell cells 411 are covered, thereby providing full light shielding protection for the solar cell cells 411 in the second direction. Exemplary overlap widths between the third isolation bars 93 and the solar cell strings 41 on either side thereof are 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, but are not limited thereto.

[0073] It can be understood that the width W4 of the third blocking strips on the left and right sides can be appropriately widened, and the overlapping width of the third isolation strip 93 and the solar cell string 41 located at the edge is 0.5mm~15mm, exemplarily 0.5mm, 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, but not limited to this, to ensure that the edges of the solar cell string 41 at the edge positions on the left and right sides are blocked. In the second direction, there is a blank area between the solar cell string 41 and the double-glass solar cell assembly. The third isolation strip 93 completely covers the blank area, blocks the unblocked blank area between the first isolation strip 91, the second isolation strip 92 and the frame, so that the areas where light leakage may occur on the entire double-glass solar cell assembly are completely blocked, replacing the use of the traditional glaze layer, better improving the anti-light leakage effect of the double-glass solar cell assembly, and reducing costs.

[0074] Preferably, the color of the front side of the isolation strip 9 is close to the color of the light-receiving surface of the cell layer 4, with no significant color difference. Depending on the color of the solar cell 411, the color of the isolation strip 9 can be dark blue, black, etc. It is understood that the color of the front side of the isolation strip 9 can be close to the color of the light-receiving surface of the cell layer 4, ensuring that the appearance color of the double-glass solar cell module is beautiful and consistent. The isolation strip 9 can be fixed to the cell layer 4 and the blank area by methods such as hot bonding and cold bonding. The hot bonding method includes but is not limited to EVA lamination and co-extrusion bonding, and the cold bonding method includes but is not limited to adhesives and positioning tape.

[0075] In some embodiments, the glass back panel 6 is a glass back panel 6 without a glaze layer. The provision of the isolation strips 9 can eliminate the provision of the glaze layer, and a conventional glass back panel 6 without a glaze layer can be selected. The isolation strips 9 in the present invention can be flexibly provided. It is understood that a glass back panel 6 with a glaze layer can also be selected. The glaze layer and the isolation strips 9 can be used in conjunction to achieve a better light blocking effect and lower cost. The glaze layer can be one or two layers of the first glaze layer, the second glaze layer, and the third glaze layer.

[0076] Optionally, an infrared reflective coating layer and / or an anti-ultraviolet coating layer is provided on the light-receiving surface of the isolation strip 9. Providing an infrared reflective coating layer on the front surface of the isolation strip 9 can improve the utilization rate of incident light energy and power generation efficiency, while adding an anti-ultraviolet coating layer, such as an anti-ultraviolet additive, can improve the weather resistance of the photovoltaic module.

[0077] Accordingly, the present invention also provides a photovoltaic system comprising the aforementioned back-contact solar cell modules. It is understood that the back-contact solar cell modules can be electrically connected in parallel or in series, and the specific configuration can be selected based on actual needs.

[0078] In this embodiment, the photovoltaic system can be applied to photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be applied to equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box and an inverter. The photovoltaic array can be an array combination of multiple battery modules. For example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter to be converted into the alternating current required by the mains power grid and then connected to the mains power network to achieve solar power supply.

[0079] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A double-glass solar cell module, characterized in that: It includes a glass front panel, a front adhesive film layer, a battery layer, a rear adhesive film layer and a glass back panel stacked in sequence from top to bottom. The cell layer includes a plurality of solar cell strings, wherein the plurality of solar cell strings are connected by bus bars, and a bus bar is provided at the head end or the tail end of the solar cell string; the bus bar is provided on each solar cell string including a plurality of solar cells, wherein the plurality of solar cells are connected by welding ribbons; Isolation bars are provided on the battery layer, and the isolation bars include a first isolation bar, a second isolation bar and a third isolation bar; The first isolation strip is arranged at the upper edge and / or the lower edge of the backlight surface of the solar cell along the first direction; The second isolation bar is arranged on a side of the bus bar away from the solar cell along the first direction, and the second isolation bar completely covers the bus bar; The third isolation strip is arranged along the second direction at a left edge and / or a right edge of the backlight surface of the solar cell string.

2. The double-glass solar cell module according to claim 1, wherein: The length of the first isolation strip is less than or equal to the length of the solar cell.

3. The double-glass solar cell module according to claim 1, wherein: There is a gap between adjacent solar cells in each solar cell string. The first isolation strip is provided at the gap between adjacent solar cells. The first isolation strip completely covers the gap, and the overlapping width between the first isolation strip and the solar cell is 1 mm to 10 mm.

4. The double-glass solar cell module according to any one of claims 1 to 3, characterized in that: The welding ribbon connects the solar cells along the second direction to form the head end and the tail end of the solar cell string. The first isolation strip is provided on the solar cells located at the head end and the tail end, and the distance between the first isolation strip and the edge of the solar cell in the second direction away from the solar cell is 1 mm to 10 mm.

5. The double-glass solar cell module according to claim 4, wherein: The welding strip is located on the backlight side of the solar cell layer, and the first isolation strip is located on a side of the welding strip close to the solar cell.

6. The double-glass solar cell module according to claim 1, wherein: The length of the second isolation strip is less than the length of the double-glass solar cell assembly in the first direction, and the length of the second isolation strip is greater than the total length of the cell layer in the first direction.

7. The double-glass solar cell module according to claim 1, wherein: The width of the second isolation bar is greater than the width of the bus bar.

8. The double-glass solar cell module according to claim 7, wherein: The distance between the second isolation strip on one side close to the solar cell and the adjacent solar cell in the second direction is 0 mm to 5 mm; A distance between a side of the second isolation bar away from the solar cell and a side of the bus bar away from the solar cell in the second direction is 2 mm to 10 mm.

9. The double-glass solar cell module according to claim 1, wherein: The second isolation strip is in contact with the first isolation strip, and a width of an overlap between the second isolation strip and the first isolation strip in a second direction on a side of the second isolation strip close to the solar cell is 0.5 mm to 5 mm.

10. The double-glass solar cell module according to claim 1, wherein: The length of the third isolation strip is greater than the length of the solar cell string in the second direction; The length of the third isolation strip is smaller than the length of the double-glass solar cell assembly in the second direction.

11. The double-glass solar cell module according to claim 1, wherein: There are gaps between adjacent solar cell strings. The third isolation strips are located at the gaps between adjacent solar cell strings. The width of the third isolation strips is greater than the width of the gaps between adjacent solar cell strings.

12. The double-glass solar cell module according to claim 11, wherein: The overlapping width between the third isolation strip and the solar cell strings on both sides thereof is 0.5 mm to 15 mm.

13. The double-glass solar cell module according to claim 1, wherein: There is a blank area between the solar cell string and the double-glass solar cell assembly in the second direction, and the third isolation strip completely covers the blank area.

14. The double-glass solar cell module according to claim 1, wherein: The color of the front surface of the isolation strip is similar to the color of the light-receiving surface of the battery layer.

15. The double-glass solar cell module according to claim 1, wherein: The light-receiving surface of the isolation strip is provided with an infrared reflective coating layer and / or an anti-ultraviolet coating layer.

16. The double-glass solar cell module according to claim 1, wherein: The glass back panel is a glass back panel without a glaze layer; Alternatively, the glass back panel is a glass back panel partially provided with a glaze layer.

17. A photovoltaic system, characterized in that: It comprises the double-glass solar cell module according to any one of claims 1 to 16.

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