Photovoltaic module and bus bar

Abstract

The embodiment of the utility model provides a photovoltaic module and a bus bar. Wherein the photovoltaic module comprises a plurality of battery strings, the plurality of battery strings are divided into two groups, the two groups of battery strings are oppositely arranged, and a strip-shaped gap is formed between the two groups of battery strings; each battery string comprises a plurality of welding strip head ends and a plurality of welding strip tail ends, and the welding strip tail ends are close to the strip-shaped gaps; the plurality of first bus bars start from the second battery string in each group of battery strings, are electrically connected with the tail ends of the plurality of welding strips of every two battery strings, and are electrically connected with the tail ends of the plurality of welding strips of the first battery string and the last battery string in each group of battery strings; the second bus bars are located in the strip-shaped gaps, and one second bus bar corresponds to two opposite first bus bars; the second bus bar comprises a main line and two branch lines, and the two branch lines are electrically connected with the two opposite first bus bars respectively. According to the embodiment of the invention, the gaps between the battery strings can be reserved without adopting AB strings, so that the shielding is avoided, and the light transmittance of the photovoltaic module is improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cell technology, and more particularly to a photovoltaic module and busbar. Background Technology

[0002] In photovoltaic (PV) modules, solar cells are interconnected by solder ribbons, with one end of the ribbon connected to one electrode of the cell and the other end to the opposite electrode of the adjacent cell, thus forming a cell string. To increase the module's light transmittance, the length of the tail solder (the end of the solder ribbon) is increased, resulting in AB strings, where the length of the solder ribbon at the beginning and end of the cell string is inconsistent. AB strings cause inconsistent distances from the cells to the busbars at the beginning and end, requiring precise layout. Furthermore, excessively long solder ribbons can cause them to bend naturally, increasing welding difficulty and affecting the module's aesthetics. Overly long AB strings also increase the production difficulty and rework rate of PV modules, impacting production efficiency. Utility Model Content

[0003] This application provides a photovoltaic module and a busbar to solve or alleviate one or more technical problems in the prior art.

[0004] As one aspect of the embodiments of this application, this application provides a photovoltaic module, including:

[0005] Multiple battery strings are divided into two groups, which are arranged opposite each other and form a strip gap between them; each battery string includes multiple solder strip head ends and multiple solder strip tail ends, with the multiple solder strip tail ends close to the strip gap.

[0006] Multiple first busbars, starting from the second battery string in each battery string group, electrically connect multiple solder ribbon ends of every two battery strings, and electrically connect multiple solder ribbon ends of the first and last battery strings in each battery string group.

[0007] Multiple second busbars are located in the strip gaps, with one second busbar corresponding to two opposite first busbars; each second busbar includes a main line and two branch lines, with the two branch lines electrically connected to the opposite two first busbars respectively.

[0008] In one embodiment, a plurality of third busbars are also included, which electrically connect the first battery string in each group of battery strings to the multiple solder strip ends of every two battery strings.

[0009] In one embodiment, a junction box is also included, which is electrically connected to the main lines of two adjacent second busbars.

[0010] In one embodiment, the battery string is formed by welding multiple battery cells together, and the battery cells are bifacial power generation cells.

[0011] In one embodiment, the photovoltaic module further includes an encapsulating film and an encapsulating glass, with the main line of the second busbar passing through the encapsulating film and the encapsulating glass and electrically connected to the junction box.

[0012] In one embodiment, the length of the first end of the solder strip extending beyond the battery string is equal to the length of the last end of the solder strip extending beyond the battery string, and the length of the last end of the solder strip extending beyond the battery string is 3-8mm.

[0013] In one embodiment, the main line of the second busbar is arranged parallel to the first busbar, and the distance from the main line of the second busbar to the battery string is 7-15mm.

[0014] In one embodiment, the width of the first busbar is equal to the width of the branch of the second busbar, and the width of the first busbar is 2-5mm; the width of the main line of the second busbar is greater than or equal to the width of the branch.

[0015] As another aspect of the embodiments of this application, the embodiments of this application also provide a bus bar, including a main line and at least one branch line.

[0016] In one implementation, there are two branches, which are arranged perpendicular to the main line.

[0017] This embodiment of the application sets the second busbar as one main line and two branch lines, and connects the two branch lines to the first busbar respectively. This allows the electricity in the first busbar to flow to the main line through the branch lines, and the main line to connect to the junction box, thereby realizing the connection between the battery string and the junction box. This method can conveniently retain the gap between the battery strings and does not require the use of AB string method, thereby improving the production efficiency and product quality of photovoltaic modules.

[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0020] Figure 1 A schematic diagram of the structure of a photovoltaic module according to an embodiment of this application is shown.

[0021] Figure 2A schematic diagram of the structure of a photovoltaic module according to another embodiment of this application is shown. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0023] This application provides a photovoltaic module in which the lengths of the first and last solder strips of the cell string are equal, thereby increasing the light transmittance of the photovoltaic module and avoiding shading that would affect its power generation efficiency. Figure 1 A schematic diagram of a photovoltaic module according to an embodiment of this application is shown. Figure 1 As shown, the photovoltaic module includes multiple cell strings 100, multiple first busbars 200, and multiple second busbars 300.

[0024] The cell string 100 refers to the cell string 100 inside the photovoltaic module, which is composed of multiple cell cells 101 welded together. After the multiple cell strings 100 are connected in series, they are encapsulated and laminated using encapsulating film and encapsulating glass to obtain a laminate. Similar to existing photovoltaic modules, the multiple cell strings 100 are divided into two groups, and the two groups of cell strings 100 are arranged opposite each other.

[0025] To increase the light transmittance of the photovoltaic module, a strip gap 600 is formed between the two sets of cell strings 100. This structure is particularly used in bifacial photovoltaic modules, allowing light to shine through the strip gap 600 to the back of the photovoltaic module, preventing light from passing through the middle of the photovoltaic module and causing that area on the back of the photovoltaic module to be dark, thus affecting the power generation efficiency of the back side.

[0026] Each battery string 100 includes multiple solder strip start ends 103 and multiple solder strip end ends 102, with the multiple solder strip end ends 102 located near the strip gap 600. Each battery string 100 includes multiple battery cells 101, which are connected in series by solder strips. After the series connection, some solder strips flow out from the start and end ends of the battery string 100 to weld with the busbar, thereby discharging current.

[0027] In the two sets of battery strings 100, each set of battery strings 100 includes multiple battery strings 100, which are arranged side by side, such as... Figure 1 As shown. The two sets of battery strings 100 arranged side by side are then positioned opposite each other, meaning that each battery string 100 has another battery string 100 opposite it. A strip gap 600 is formed between the two opposing sets of battery strings 100 for electrical connection with the busbar.

[0028] like Figure 1As shown, multiple first busbars 200 electrically connect multiple solder ribbon ends 102 of every two battery strings 100, starting from the second battery string 100 in each group of battery strings 100, and electrically connect multiple solder ribbon ends 102 of the first and last battery strings 100 in each group of battery strings 100. The first busbars 200 electrically connect the multiple solder ribbon ends 102 of two battery strings 100, allowing the two battery strings 100 to be connected in series, and the current between the two battery strings 100 can flow through the first busbars 200.

[0029] like Figure 1 As shown, the second busbar 300 is located in the strip gap 600, and one second busbar 300 corresponds to two opposite first busbars 200; the second busbar 300 includes a main line 301 and two branch lines 302, and the two branch lines 302 are electrically connected to the two opposite first busbars 200 respectively.

[0030] In this embodiment, the second busbar 300 is configured as a main line 301 and two branch lines 302, and the two branch lines 302 are respectively connected to the first busbar 200. This allows the electricity in the first busbar 200 to flow to the main line 301 through the branch lines 302. The main line 301 is then connected to the junction box 500, thereby enabling the battery string 100 to be connected to the junction box 500. This method can conveniently preserve the gap between the battery strings 100 and does not require the use of an AB string method, thereby improving the production efficiency and product quality of photovoltaic modules.

[0031] In one implementation, such as Figure 1 As shown, the photovoltaic module also includes multiple third busbars 400, which electrically connect the first cell string 100 in each group of cell strings 100 to multiple solder strip ends 103 of every two cell strings 100. The connection between the first busbar 200 and the third busbars 400 enables the multiple cell strings 100 in the group of cell strings 100 to be connected in series.

[0032] In one implementation, such as Figure 2 As shown, the photovoltaic module also includes a junction box 500, which is electrically connected to the main lines 301 of two adjacent second busbars 300. The junction box 500 includes a power optimization module to optimize the current output from the main lines 301 of the second busbars 300 by the photovoltaic module to obtain a stable voltage signal.

[0033] In one example, a photovoltaic module has a set of six battery strings 100 and three junction boxes 500. There are four first busbars 200 electrically connected to the solder ribbon ends 102 of the battery strings 100: one for the first battery string 100, one for the second and third battery strings 100, one for the fourth and fifth battery strings 100, and one for the sixth battery string 100. This photovoltaic module includes two sets of battery strings 100, 12 battery strings 100, and 8 first busbars 200. Each pair of busbars is positioned opposite each other and corresponds to a second busbar 300, resulting in four second busbars 300. These four second busbars 300 are electrically connected to three junction boxes 500. The two interfaces of each junction box 500 are electrically connected to two adjacent busbars.

[0034] In one embodiment, the battery string 100 is formed by welding multiple battery cells 101 together, and the battery cells 101 are bifacial power-generating cells 101. A bifacial power-generating cell 101 is a cell 101 whose back side can also absorb photons and generate electrical energy; therefore, the back side also needs to receive sunlight. Through the design of this embodiment, shading of the back side of the photovoltaic module can be avoided, thereby greatly improving the power generation efficiency of the bifacial power-generating battery module.

[0035] In one embodiment, the photovoltaic module further includes an encapsulating film and an encapsulating glass, with the main line 301 of the second busbar 300 passing through the encapsulating film and the encapsulating glass and electrically connected to the junction box 500.

[0036] The encapsulating film and encapsulating glass are used to encapsulate the battery string 100, and the first bus bar 200, the second bus bar 300 and the third bus bar 400 are all encapsulated in the encapsulating glass. Only the main wire 301 of the second bus bar 300 extends out of the encapsulating glass and is electrically connected to the junction box 500.

[0037] In one embodiment, the length of the first end 103 of the solder strip extending beyond the battery string 100 is equal to the length of the last end 102 of the solder strip extending beyond the battery string 100, and the length of the last end 102 of the solder strip extending beyond the battery string 100 is 3-8mm.

[0038] The photovoltaic module structure of this application embodiment does not necessarily require an AB string configuration. Specifically, the length of the solder ribbon's first end 103 extending beyond the cell string 100 is equal to the length of the solder ribbon's last end 102 extending beyond the cell string 100. This avoids localized bending of the solder ribbon, which would affect the aesthetics of the photovoltaic module. The length of the solder ribbon's last end 102 extending beyond the cell string 100 is 3-8mm, for example, 3mm, 5mm, or 8mm.

[0039] In one embodiment, the main line 301 of the second busbar 300 is arranged parallel to the first busbar 200. Preferably, the main line 301 of the second busbar 300 is located in the middle of two opposing first busbars 200, and the distance from the main line 301 of the second busbar 300 to the battery string 100 is 7-15mm. The spacing between two opposing first busbars 200 can be 14-30mm. The wider the spacing, the larger the space for light absorption, which is more conducive to power generation on the back of the photovoltaic module.

[0040] In one embodiment, the width of the first busbar 200 is equal to the width of the branch line 302 of the second busbar 300, and the width of the first busbar 200 is 2-5mm; the width of the main line 301 of the second busbar 300 is greater than or equal to the width of the branch line 302.

[0041] The branch line 302 of the first busbar 200 and the second busbar 300 transmits half the current of the entire component. Its width can be smaller than the width of the main line 301 of the second busbar 300 without affecting the transmission efficiency. The width of the first busbar 200 is 2-5mm, for example, 2mm, 3mm or 5mm.

[0042] Other components of the photovoltaic modules in the above embodiments can be derived from various technical solutions that are now and will be known to those skilled in the art, and will not be described in detail here.

[0043] This application embodiment also provides a busbar, including a main line 301 and at least one branch line 302.

[0044] In one embodiment, there are two branch lines 302, as in the above embodiment, where one branch line 302 is electrically connected to one first busbar 200. The branch line 302 is arranged perpendicularly to the main line 301, so that the shorter branch line 302 can achieve the electrical connection between the main line 301 and the first busbar 200.

[0045] Other configurations of the busbar in the above embodiments can be adopted from various technical solutions that are now and will be known to those skilled in the art, and will not be described in detail here.

[0046] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A photovoltaic module, characterized by, The application relates to a photovoltaic module, which comprises: a plurality of battery strings, the plurality of battery strings being divided into two groups, the two groups of battery strings being oppositely arranged, and a strip-shaped gap being formed between the two groups of battery strings; each of the battery strings comprises a plurality of welding strip head ends and a plurality of welding strip tail ends, and the plurality of welding strip tail ends are close to the strip-shaped gap; a plurality of first bus bars, the plurality of first bus bars being electrically connected to the plurality of welding strip tail ends of every two battery strings from the second battery string in each group of battery strings, and the plurality of first bus bars being electrically connected to the plurality of welding strip tail ends of the first battery string and the last battery string in each group of battery strings; a plurality of second bus bars, the second bus bars being located in the strip-shaped gap, one of the second bus bars corresponding to two opposite first bus bars; the second bus bar comprises a main line and two branch lines, and the two branch lines are electrically connected to the two opposite first bus bars respectively.

2. The photovoltaic module of claim 1, wherein, The application further comprises a plurality of third bus bars, the plurality of third bus bars being electrically connected to the plurality of welding strip head ends of every two battery strings from the first battery string in each group of battery strings.

3. The photovoltaic module of claim 2, wherein, The application further comprises a junction box, the junction box being electrically connected to the main lines of two adjacent second bus bars.

4. The photovoltaic module of claim 3, wherein, The battery strings are obtained by stringing a plurality of battery pieces, and the battery pieces are double-sided power generation battery pieces.

5. The photovoltaic module according to claim 3 or 4, characterized in that The photovoltaic module further comprises encapsulating adhesive films and encapsulating glass, and the main lines of the second bus bars are electrically connected to the junction box through the encapsulating adhesive films and the encapsulating glass.

6. The photovoltaic module of claim 1, wherein, The length of the welding strip head end exceeding the battery string is equal to the length of the welding strip tail end exceeding the battery string, and the length of the welding strip tail end exceeding the battery string is 3-8 mm.

7. The photovoltaic module of claim 1, wherein, The main line of the second bus bar is parallel to the first bus bar, and the distance between the main line of the second bus bar and the battery string is 7-15 mm.

8. The photovoltaic module of claim 1 or 7, wherein, The width of the first bus bar is equal to the width of the branch line of the second bus bar, and the width of the first bus bar is 2-5 mm; the width of the main line of the second bus bar is greater than or equal to the width of the branch line.

9. A busbar, characterized in that The main line and at least one branch line are comprised.

10. The busbar of claim 9, wherein, The number of the branch lines is two, and the branch lines are perpendicular to the main line.

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