Photovoltaic module and photovoltaic system

Abstract

The present disclosure provides a photovoltaic module and a photovoltaic system. The photovoltaic module comprises a battery string A and a battery string B, each comprising a plurality of battery sheets in series connection with one another. A front electrode of one battery sheet is connected to a back electrode of another adjacent battery sheet. The photovoltaic module further comprises a plurality of bus bars, at least one bus bar being arranged on the back of the battery sheet.

Description

Photovoltaic modules and photovoltaic systems

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese patent application No. 202422110880.X, filed on August 28, 2024, with the title "Photovoltaic Module and Photovoltaic System", and to Chinese patent application No. 202521108853.7, filed on May 30, 2025, with the title "Photovoltaic Module and Photovoltaic System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of new energy technology, and more specifically, to a photovoltaic module and a photovoltaic system. Background Technology

[0004] With the development of modern society, the photovoltaic industry has developed rapidly. Domestic and international photovoltaic companies produce solar modules that include both cell and glass components. Users can see the busbars on the cell component through the glass. Due to limited usable area on rooftops and in factories, users tend to choose photovoltaic products with high power, high conversion efficiency, and aesthetic appeal. However, photovoltaic products where the busbars are visible from the front have poor aesthetics, thus affecting the profitability of the photovoltaic product. Furthermore, the exposed busbar configuration also results in a larger module size and higher cost. Therefore, existing technologies suffer from poor aesthetics in photovoltaic products. Additionally, in existing technologies, the busbar configuration occupies some unused space, leading to a lower power generation per unit area of ​​the photovoltaic module.

[0005] Public content

[0006] The main purpose of this disclosure is to provide a photovoltaic module and a photovoltaic system to solve the problems of poor aesthetics and low power generation per unit area in existing photovoltaic products.

[0007] To achieve the above objectives, a photovoltaic module is provided according to one aspect of this disclosure, comprising: a cell array including a plurality of rows of cell strings arranged side by side along a second direction, each row of cell strings including cell strings A and cell strings B distributed along a first direction, cell strings A and cell strings B in each row being connected in series or in parallel, cell strings A and cell strings B each including a plurality of cells connected in series along the first direction, the second direction being perpendicular to the first direction; in cell string A, the front electrode of one of two adjacent cell strings is connected to the back electrode of the other cell string, and in cell string B, the front electrode of one of two adjacent cell strings is connected to the back electrode of the other cell string; and a plurality of busbars, at least one of which is disposed on the back side of the cell string.

[0008] In some embodiments, battery string A and battery string B are connected in series via solder strip I.

[0009] In some embodiments, the multiple busbars include busbars II disposed at two ends of the photovoltaic module in a first direction. The busbar II located at one end of the photovoltaic module is disposed on the back side of the end cell in the battery string A and is connected to the electrode of the end cell in the battery string A via a solder ribbon III. The busbar II located at the other end of the photovoltaic module is disposed on the outside of the end cell in the battery string B and is connected to the electrode of the end cell in the battery string B via a solder ribbon IV.

[0010] In some embodiments, the multiple busbars include busbars II disposed at two ends of the photovoltaic module in a first direction. The two busbars II are respectively disposed on the back of the solar cells at the two ends of the photovoltaic module in the first direction. The busbar II disposed at one end is connected to the electrode of the solar cell located at the end of the solar cell string A via a solder strip III, and the busbar II disposed at the other end is connected to the electrode of the solar cell located at the end of the solar cell string B via a solder strip I.

[0011] In some embodiments, multiple busbars include busbar I disposed in the middle of the photovoltaic module, and battery strings A and B located in the same row are connected in parallel with busbar I via solder strip II.

[0012] In some embodiments, busbar I is connected to the front electrode of the battery cell closest to battery cell B in battery string A and the battery cell closest to battery cell A in battery string B via the same solder strip II; or busbar I is connected to the back electrode of the battery cell closest to battery cell B in battery string A and the battery cell closest to battery cell A in battery string B via the same solder strip II.

[0013] In some embodiments, busbar I is connected to the front electrode of the battery cell closest to battery cell B in battery string A and the battery cell closest to battery cell A in battery string B via different solder ribbons II; or busbar I is connected to the back electrode of the battery cell closest to battery cell B in battery string A and the battery cell closest to battery cell A in battery string B via different solder ribbons II.

[0014] In some embodiments, the multiple busbars include busbar II (220) disposed at both ends of the photovoltaic module, the busbar II (220) being located on the back of the end cell (100) and connected to the cell (100) by solder strip III (330).

[0015] In some embodiments, when the busbar I (210) is connected to the back electrode of the cell (100) closest to the battery string B (120) in the battery string A (110) and the cell (100) closest to the battery string A (110) in the battery string B (120) respectively via the same solder strip II (320), there is an overlap between the back of the busbar I (210) and the back of the cell (100) closest to the battery string B (120) in the battery string A (110); or there is an overlap between the busbar I (210) and the back of the cell (100) closest to the battery string A (110) in the battery string B (120).

[0016] In some embodiments, the multiple busbars further include busbar II disposed at two ends of the photovoltaic module in a first direction, and at least one of busbar I and busbar II is disposed on the back side of the solar cell.

[0017] In some embodiments, a busbar II located at one end of the photovoltaic module is disposed on the back side of the end cell in the battery string A and is connected to the electrode of the end cell in the battery string A via a solder ribbon III; a busbar II located at the other end of the photovoltaic module is disposed on the outside of the end cell in the battery string B and is connected to the electrode of the end cell in the battery string B via a solder ribbon IV.

[0018] In some embodiments, in at least one row of battery strings, the solder ribbon III is connected to the front electrode of the battery cell located at the end of the battery string A, and the solder ribbon III is bent from the front to the back of the battery cell located at the end of the battery string A to connect with the busbar II.

[0019] In some embodiments, in at least one row of battery strings, a busbar II disposed on the back side of the battery cell located at the end of the battery string A is provided with an insulating layer between the busbar II and the back side of the battery cell.

[0020] In some embodiments, in at least one row of battery strings, the solder strip III has a first extension extending to the back of the battery cell located at the end of the battery string A. The first extension is connected to the busbar II. In the thickness direction of the photovoltaic module, the first extension does not overlap with the solder strip on the back of the battery cell.

[0021] In some embodiments, the busbars II at both ends are respectively disposed on the back of the battery cells at both ends of the same row of battery strings in a first direction. The busbar II at one end is connected to the electrode of the battery cell at the end of the battery string A via a solder strip III, and the busbar II at the other end is connected to the electrode of the battery cell at the end of the battery string B via a solder strip IV.

[0022] In some embodiments, in at least one row of battery strings, solder ribbon III is connected to the front electrode of the battery cell located at the end of battery string A, and solder ribbon III is bent from the front to the back of the battery cell located at the end of battery string A to connect with busbar II; solder ribbon IV is connected to the front electrode of the battery cell located at the end of battery string B, and solder ribbon IV is bent from the front to the back of the battery cell located at the end of battery string B to connect with busbar II.

[0023] In some embodiments, in at least one row of battery strings, the busbars II at both ends of the photovoltaic module in a first direction and the back of the battery cells are provided with an insulating layer.

[0024] In some embodiments, in at least one row of battery strings, solder strip III has a first extension extending on the back side of the battery cell at the end of battery string A, the first extension being connected to busbar II, and the first extension not overlapping with the solder strip on the back side of the battery cell in the thickness direction of the photovoltaic module; solder strip IV has a second extension extending to the back side of the battery cell at the end of battery string B, the second extension being connected to busbar II, and the second extension not overlapping with the solder strip on the back side of the battery cell in the thickness direction of the photovoltaic module.

[0025] In some embodiments, in at least one row of battery strings, at least one of the busbars II is disposed on the back side of the battery cell and connected to the back electrode of the battery cell.

[0026] In some embodiments, busbar I is located in the middle region of the photovoltaic module, and busbar I is disposed on the back side of the cell closest to cell string B in cell string A; or busbar I is disposed on the back side of the cell closest to cell string A in cell string B.

[0027] In some embodiments, busbar I is located in the middle region of the photovoltaic module and is disposed on the back side of the cell closest to cell string B in cell string A. In at least one row of cell strings, busbar I is connected to the front electrodes of two adjacent cells in cell string A and cell string B respectively by solder ribbon II. Solder ribbon II connected to cell string A and solder ribbon II connected to cell string B are both bent from the front side to the back side of the cell to connect with busbar I.

[0028] In some embodiments, in at least one row of battery strings, an insulating layer is provided between the busbar I and the back of the battery cell.

[0029] In some embodiments, the solder strip II connected to the battery string A and the solder strip II connected to the battery string B both have a third extension extending to the front side of the battery cell on which the busbar I is provided. In the thickness direction of the photovoltaic module, the third extension does not overlap with the solder strip on the back side of the battery cell.

[0030] In some embodiments, the busbar I overlaps with the back of the battery cell closest to battery cell B in battery string A and the back of the battery cell closest to battery cell A in battery string B.

[0031] In some embodiments, battery strings A and B located in the same row are spaced apart in a first direction, and busbar I is located in the gap between battery strings A and B.

[0032] In some embodiments, a busbar II located at one end of the photovoltaic module is disposed on the outside of the end cell in the cell string A and connected to the electrode of the end cell in the cell string A via a solder ribbon III; a busbar II located at the other end of the photovoltaic module is disposed on the outside of the end cell in the cell string B and connected to the electrode of the end cell in the cell string B via a solder ribbon III; a busbar I is located in the middle region of the photovoltaic module, and a busbar I is located on the back side of the cell in the cell string A closest to the cell string B; or a busbar I is located on the back side of the cell in the cell string B closest to the cell string A; or a busbar I overlaps with both the back side of the cell in the cell string A closest to the cell string B and the back side of the cell in the cell string B closest to the cell string A.

[0033] In some embodiments, in a photovoltaic module, multiple battery strings A distributed along a second direction are arranged in pairs, and multiple battery strings B distributed along a second direction are also arranged in pairs; the two battery strings A in each pair of battery strings A are connected in series through the same busbar II, and the two battery strings B in each pair of battery strings B are connected in series through a busbar II.

[0034] According to another aspect of this disclosure, a photovoltaic system is provided, including the photovoltaic module described above.

[0035] In the photovoltaic module and photovoltaic system disclosed herein, the photovoltaic module includes multiple parallel-arranged cell strings A and multiple parallel-arranged cell strings B. Cell strings A and B each include multiple cells connected in series. Adjacent cells are connected by solder ribbons I, with the front electrode of one cell and the back electrode of another cell connected together. Thus, by placing solder ribbons between any two adjacent cells, the series connection of multiple cells in any cell string is achieved. Furthermore, since the photovoltaic module also includes multiple busbars, at least one of which is located on the back of the cell, at least one busbar can be hidden on the back of the cell, making it invisible to the user from the front of the cell. This improves the aesthetics and compactness of the product while ensuring the busbars are connected. At the same time, hiding the busbars on the back of the cell allows for the reduction of the overall size of the photovoltaic module while making reasonable use of the space area of ​​the photovoltaic module, thereby reducing the overall cost of the photovoltaic module and solving the problem of poor aesthetics in existing photovoltaic products.

[0036] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0037] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure. In the drawings:

[0038] Figure 1 shows a side view of a photovoltaic module in a specific embodiment of the present disclosure;

[0039] Figure 2 shows a top view of the photovoltaic module in Figure 1;

[0040] Figure 3 shows a side view of a photovoltaic module in another specific embodiment of the present disclosure;

[0041] Figure 4 shows a top view of the photovoltaic module in Figure 3;

[0042] Figure 5 shows a side view of a photovoltaic module in another specific embodiment of the present disclosure;

[0043] Figure 6 shows a top view of the photovoltaic module in Figure 5;

[0044] Figure 7 shows a side view of a photovoltaic module in another specific embodiment of the present disclosure;

[0045] Figure 8 shows a top view of the photovoltaic module in Figure 7;

[0046] Figure 9 shows a side view of a photovoltaic module in another specific embodiment of the present disclosure;

[0047] Figure 10 shows a top view of the photovoltaic module in Figure 9;

[0048] Figure 11 shows a side view of a photovoltaic module in another specific embodiment of the present disclosure;

[0049] Figure 12 shows a top view of the photovoltaic module in Figure 11;

[0050] Figure 13 is a schematic cross-sectional view of the photovoltaic module along line AA in Figure 6;

[0051] Figure 14 is a schematic cross-sectional view of the photovoltaic module along line BB in Figure 6;

[0052] Figure 15 is a schematic cross-sectional view of the photovoltaic module along line CC in Figure 10. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this disclosure and are not intended to limit this disclosure.

[0054] In the description of this disclosure, it should be understood that the terms “length”, “width”, “upper”, “lower”, “left”, “right”, “lateral”, “longitudinal”, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure 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, and therefore should not be construed as a limitation of this disclosure.

[0055] 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 the stated features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0057] In this disclosure, 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 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 directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. 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 embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this disclosure, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0059] To address the issues of poor aesthetics and low power generation per unit area in existing photovoltaic products, this disclosure provides a photovoltaic module and a photovoltaic system. The photovoltaic system described below includes the photovoltaic module described below. According to one embodiment of this disclosure, a photovoltaic module is provided, as shown in Figures 1 to 12. This photovoltaic module includes multiple parallel-arranged battery strings A 110 and multiple parallel-arranged battery strings B 120. Battery strings A 110 and B 120 each include multiple interconnected solar cells 100. Adjacent solar cells 100 are connected by solder strips I 310, with the front electrode of one solar cell and the back electrode of another solar cell connected together. The photovoltaic module also includes multiple busbars 20, with at least one busbar 20 disposed on the back side of the solar cells 100.

[0060] In this embodiment, solder strips are placed between any two adjacent solar cells to connect them, enabling series connection of multiple solar cells within any solar cell string. Furthermore, at least one busbar is located on the back of the solar cell, thus concealing it from the front and improving the product's aesthetics and compactness while maintaining current flow. This method of hiding the busbar on the back of the solar cell also allows for smaller overall photovoltaic module dimensions, making efficient use of the module's space and reducing overall cost. This addresses the issue of poor aesthetics in existing photovoltaic products. Additionally, it increases the power generation per unit area of ​​the photovoltaic module.

[0061] It should be noted that the front electrode of the solar cell can be the side facing the sunlight, while the back electrode can be the side facing away from the sunlight. That is to say, the solar cell has a front electrode on the front and a back electrode on the back. The solar cell can be, for example, a PERC solar cell, a Topcom solar cell, a heterojunction solar cell, etc., and there are no specific limitations here.

[0062] In the photovoltaic module disclosed herein, as shown in Figures 1 to 12, multiple battery strings A 110 and multiple battery strings B 120 are arranged side by side to form a cell array. The cell array includes several rows of battery strings arranged side by side along a second direction (6 rows are shown in the figures). Each row of battery strings in the cell array may include a battery string A 110 and a battery string B 120 distributed along a first direction. Battery strings A 110 and B 120 located in the same row may be connected in series or in parallel. That is, battery strings A 110 and B 120 in each row are connected in series or in parallel. In the solar cell array, multiple battery strings A 110 and multiple battery strings B 120 are distributed along the second direction. That is, in the embodiments of this disclosure, multiple battery strings A 110 are distributed along the second direction, and multiple battery strings B 120 are also distributed along the second direction. Each battery string A 110 corresponds to one battery string B 120 in the first direction, thereby forming a row of battery strings. Thus, the solar cell array includes several rows of battery strings arranged side by side along the second direction. The first direction is perpendicular to the second direction. Specifically, the first direction can be the longitudinal direction of the photovoltaic module, and the second direction can be the transverse direction of the photovoltaic module.

[0063] In some embodiments, in battery string A110, the front electrode of one of two adjacent battery cells 100 is connected to the back electrode of the other battery cell 100, and in battery string B120, the front electrode of one of two adjacent battery cells 100 is connected to the back electrode of the other battery cell 100.

[0064] Specifically, in some possible embodiments, in battery string A110 and battery string B120, two adjacent battery cells 100 can be connected by solder ribbon I310 to connect the front electrode of one battery cell 100 and the back electrode of the other battery cell 100 respectively to realize the series connection of battery cells 100 in each battery string.

[0065] Of course, it is understood that in some possible embodiments, in battery strings A110 and B120, adjacent battery cells 100 may also be connected in series by shingling. For example, in some embodiments, the front electrode of the upper battery cell in an overlapping battery cell abuts against the back electrode of the lower battery cell. That is to say, in this disclosure, within each battery string, adjacent battery cells 100 may be connected in series by solder ribbon I310, or the front electrode of one battery cell 100 may be directly abutted against the back electrode of another battery cell 100 by shingling. The specific connection is not limited here.

[0066] In the photovoltaic module disclosed herein, there may be gaps or partial overlap between cell string A 110 and cell string B 120.

[0067] Specifically, as shown in Figures 1 to 12, battery strings A 110 and B 120 located in the same row are arranged at intervals, and battery strings A 110 and B 120 located in the same row can be connected by solder ribbon I 310 or by solder ribbon II 320. In some embodiments not shown in the figures of this disclosure, battery strings A 110 and B 120 may partially overlap, and the overlapping battery cells in battery strings A 110 and B 120 are connected by solder ribbons.

[0068] In some alternative implementations, as shown in Figures 1 to 4, battery string A 110 and battery string B 120 can be connected in series via solder strip I 310.

[0069] Specifically, as shown in Figures 1 to 4, the front electrode of one cell in battery string A 110 is connected to the back electrode of another cell via solder ribbon I 310, and the front electrode of one cell in battery string B 120 is connected to the back electrode of another cell via solder ribbon I 310. The cell in battery string A 110 near one end of battery string B 120 is connected to the cell in battery string B 120 near one end of battery string A 110 via solder ribbon I 310, thereby realizing the series connection of battery string A 110 and battery string B 120.

[0070] It should be noted that, as shown in Figures 1 to 4, the front electrode of the battery cell 100 in battery string A 110 is connected to the back electrode of the battery cell 100 in battery string B 120. However, the connection is not limited to the above relationship. The battery cell 100 in battery string A 110 can also be connected to the front electrode of the battery cell 100 in battery string B 120 through the back electrode of the battery cell 100.

[0071] For the series connection of battery string A 110 and battery string B 120, the multiple busbars 20 in the photovoltaic module are busbars II 220 set at the ends, and at least one busbar II 220 is set on the back of the cell 100, thereby achieving concealment on the back of the cell 100.

[0072] Specifically, in order to hide the busbar II 220 at one end of the photovoltaic module from the back of the cell 100, in some optional embodiments, as shown in Figures 1 and 2, the multiple busbars 20 include busbars II 220 disposed at both ends of the photovoltaic module in a first direction. One end of the busbar II 220 is disposed on the back of the cell 100 located at the end (lower end in the first direction in the figures) of the cell string A 110 and is connected to the electrode of the cell 100 at the end of the cell string A 110 via solder ribbon III 330. The other end of the busbar II 220 is located on the outside of the cell 100 at the end (upper end in the first direction in the figures) of the cell string B 120 and is connected to the electrode of the cell 100 at the end of the cell string B 120 via solder ribbon IV 340.

[0073] To conceal the busbars II 220 at both ends of the photovoltaic module on the back of the cell 100, in some alternative embodiments, as shown in Figures 3 and 4, the multiple busbars 20 include busbars II 220 disposed at both ends of the photovoltaic module in a first direction. The busbars II 220 are located on the back of the cell 100 at the middle end of the photovoltaic module. The busbar II 220 disposed at one end (lower end in the first direction) is connected to the electrode of the cell 100 at the middle end (lower end in the first direction) of the cell string A 110 via solder ribbon III 330. The busbar II 220 disposed at the other end (upper end in the first direction) is connected to the electrode of the cell 100 at the middle end (upper end in the first direction) of the cell string B 120 via solder ribbon I 310.

[0074] In the above optional embodiments, as shown in FIG3, the busbar II 220 disposed at the upper end can be located on the back electrode of the cell 100 at the middle end of the cell string B 120, and connected to the back electrode of the cell 100 by solder ribbon I 310. Solder ribbon V 350 can also be disposed on the front electrode of the cell 100, so that the solder ribbons on the front electrodes of other cells 100 are consistent in appearance, thereby improving the aesthetics of the photovoltaic module.

[0075] It should be noted that the types of solder strip I 310, solder strip II 320, solder strip III 330, solder strip IV 340 and solder strip V 350 may be the same or different, and this disclosure does not impose specific limitations.

[0076] For example, as shown in Figures 1 and 2, Figure 1 shows a photovoltaic module with battery string A 110 and battery string B 120 connected in series, and Figure 2 is a top view of the photovoltaic module in Figure 1. Busbar II 220 is disposed at both ends of the photovoltaic module. The busbar II 220 disposed at one end is located on the back of the end cell 100 in battery string A 110 and is connected to the electrode of the end cell 100 in battery string A 110 through solder ribbon III 330, thereby realizing that the busbar II 220 at one end is hidden on the back of the cell 100. The busbar II 220 disposed at the other end is disposed on the outside of the end cell 100 in battery string B 120 and is connected to the electrode of the end cell 100 in battery string B 120 through solder ribbon IV 340.

[0077] In another example, as shown in Figures 3 and 4, Figure 3 shows another photovoltaic module with battery string A 110 and battery string B 120 connected in series, and Figure 4 is a top view of the photovoltaic module in Figure 3. Busbar II 220 is set at both ends of the photovoltaic module. The busbar II 220 at one end is connected to the electrode of the cell 100 at the middle end of battery string A 110 through solder ribbon III 330, and the busbar II 220 at the other end is connected to the electrode of the cell 100 at the middle end of battery string B 120 through solder ribbon I 310. The busbar II 220 is located on the back of the cell 100 at the middle end of the photovoltaic module, thereby hiding the busbar II 220 at both ends on the back of the cell 100.

[0078] In some alternative embodiments, as shown in Figures 5 to 12, battery strings A 110 and B 120 are connected in parallel via solder ribbon II 320 and busbar I 210 of the multiple busbars 20 (i.e., solder ribbon II 320 and busbar I 210 of the multiple busbars 20 connect battery strings A 110 and B 120 in parallel). In this case, the multiple busbars 20 include busbar I 210 disposed in the middle of the photovoltaic module, and battery strings A 110 and B 120 located in the same row are connected in parallel via solder ribbon II 320 and busbar I 210 (i.e., solder ribbon II 320 and busbar I 210 connect battery strings A 110 and B 120 located in the same row in parallel).

[0079] Specifically, as shown in Figures 5 to 12, in some embodiments, the front electrode of one cell in battery string A 110 is connected to the back electrode of another cell via solder ribbon I 310, and the front electrode of one cell in battery string B 120 is connected to the back electrode of another cell via solder ribbon I 310.

[0080] The front electrodes of two adjacent battery cells 100 in battery string A 110 and battery string B 120 (i.e., the battery cell 100 in battery string A110 closest to battery string B120 and the battery cell 100 in battery string B120 closest to battery string A110) are connected to bus bar I210 via solder ribbon II 320, thereby realizing the parallel connection of battery string A 110 and battery string B 120.

[0081] It should be noted that battery string A 110 and battery string B 120 are connected to busbar I 210 via solder ribbon II 320. The solder ribbon II 320 connecting battery string A 110 and battery string B 120 can be the same or different. Specifically, as shown in Figures 5 and 6, busbar I 210 is connected to the front electrode of two adjacent battery cells 100 in battery string A 110 and battery string B 120 respectively via different solder ribbons II 320.

[0082] It is easy to understand that, in addition to the connection method of battery string A 110 and battery string B 120 with solder ribbon II 320 as described above, as shown in Figures 7 to 12, bus bar I 210 can also be connected to the front electrode of two adjacent battery cells 100 in battery string A 110 and battery string B 120 through the same solder ribbon II 320.

[0083] That is to say, in this disclosure, the busbar I210 is connected to the front electrode or back electrode of the battery cell 100 closest to the battery cell B120 in the battery string A110 and the battery cell 100 closest to the battery cell A110 in the battery string B120 through the same solder ribbon II320; or the busbar I210 is connected to the front electrode or back electrode of the battery cell 100 closest to the battery cell B120 in the battery string A110 and the battery cell 100 closest to the battery cell A110 in the battery string B120 through different solder ribbons II320.

[0084] In this disclosure, busbar I 210 can be connected to the front electrode of two adjacent cells 100 in cell strings A110 and B120 via solder ribbon II 320, or busbar I 210 can be connected to the back electrode of two adjacent cells 100 in cell strings A110 and B120 via solder ribbon II 320. For example, in several rows of cell strings of a photovoltaic module, in some rows of cell strings (e.g., the odd-numbered rows from left to right), busbar I 210 can be connected to the front electrode of two adjacent cells 100 in cell strings A110 and B120 via solder ribbon II 320, and in some rows of cell strings (e.g., the even-numbered rows from left to right), busbar I 210 can be connected to the back electrode of two adjacent cells 100 in cell strings A110 and B120 via solder ribbon II 320.

[0085] For the parallel connection of battery string A 110 and battery string B 120, the multiple busbars 20 in the photovoltaic module include a busbar I 210 located in the middle and busbars II 220 located at the ends. At least one of busbar I 210 and busbar II 220 is located on the back of the cell 100, thereby achieving concealment on the back of the cell 100. That is to say, in addition to the busbar I 210 located in the middle, the multiple busbars 20 of the photovoltaic module also include busbars II 220 located at the two ends of the photovoltaic module in the first direction, and at least one of busbar I 210 and busbar II 220 is located on the back of the cell 100.

[0086] Specifically, in order to hide the busbar II 220 on the back of the solar cell 100, in some alternative embodiments, as shown in Figures 5 and 6, the multiple busbars 20 include busbar II 220 disposed at both ends of the photovoltaic module. The busbar II 220 is located on the back of the solar cell 100 at the end and is connected to the solar cell 100 by a solder strip.

[0087] For example, as shown in Figures 5 and 6, Figure 5 shows a photovoltaic module with battery string A 110 and battery string B 120 connected in parallel, and Figure 6 is a top view of the photovoltaic module in Figure 5. Battery string A 110 and battery string B 120 are connected in parallel via solder ribbon II 320 and busbar I 210 of multiple busbars 20. Busbar I 210 is located in the middle of the photovoltaic module, and the busbar I 210 is connected to the front electrode of two adjacent cells 100 in battery string A 110 and battery string B 120 respectively via different solder ribbons II 320. Busbar II 220 is located at both ends of the photovoltaic module. Busbar II 220 is located on the back of the end cells 100 and is connected to the cell 100 via solder ribbon III 330, thereby hiding the busbar II 220 at both ends on the back of the cell 100.

[0088] To conceal the busbar I 210 on the back of the battery cell 100, in some optional embodiments, as shown in Figures 7 to 12, the solder ribbon II 320 simultaneously connects the back electrodes of two adjacent battery cells 100 in battery string A 110 and battery string B 120. In this case, the busbar I 210 can be concealed by placing it on the back of at least one of the two adjacent battery cells 100. That is, in the embodiments of this disclosure, to conceal the busbar I 210, the busbar I 210 can be located on the back of the battery cell 100 in battery string A110 that is closest to battery string B120, or the busbar I 210 can be located on the back of the battery cell 100 in battery string B120 that is closest to battery string A110.

[0089] It should be noted that the fact that the busbar I 210 is hidden on the back of the battery cell 100 as mentioned in this disclosure does not mean that the busbar I 210 is completely obscured by the back of the battery cell 100. Since there may be gaps between adjacent battery cells 100 in battery string A 110 and battery string B 120, if the busbar I 210 is placed on the back of the adjacent battery cell 100 and corresponds to the gap mentioned above, although a very small part of the busbar I 210 will be visible through the gap, most of the busbar I 210 will be obscured by the back of the battery cell 100. This situation can also be understood as the busbar I 210 being hidden on the back of the battery cell 100.

[0090] In some embodiments, as shown in Figures 7 and 8, the busbar I 210 may partially overlap with the back surfaces of adjacent battery cells 100 in battery string A 110 and battery string B 120. That is, the busbar I 210 overlaps with the back surface of the battery cell 100 closest to battery string B 120 in battery string A 110 and the back surface of the battery cell 100 closest to battery string A 110 in battery string B 120.

[0091] At this time, the busbar I 210 is disposed on the back of the adjacent battery cell 100 and corresponds to the gap between the adjacent battery cell 100, thereby enabling the busbar I 210 to be hidden on the back of the battery cell 100.

[0092] To completely conceal the busbar I 210 on the back of the battery cell 100, as shown in Figures 9 and 12, the busbar I 210 overlaps only with the back of one of the two adjacent battery cells 100. In this case, the busbar I 210 is positioned on the back of any one of the adjacent battery cells 100. Although there is a gap between the adjacent battery cells 100, the busbar I 210 does not overlap with the gap, thus making the busbar I 210 invisible through the gap and completely obscured by the back of the battery cell 100.

[0093] As shown in Figures 7 to 12, for the configuration where busbar I 210 is hidden on the back of the solar cell 100, busbar II 220 can be located on the outer side of the end of the solar cell 100 and connected to the front electrode of the solar cell 100 via solder ribbon III 330. In this case, busbar I 210 is hidden on the back of the corresponding solar cell 100, while busbar II 220 located at both ends are not obstructed.

[0094] For example, as shown in Figures 7 and 8, Figure 7 shows a photovoltaic module with battery string A 110 and battery string B 120 connected in parallel, and Figure 8 is a top view of the photovoltaic module in Figure 7. Battery string A 110 and battery string B 120 are connected in parallel through solder ribbon II 320 and busbar I 210 of multiple busbars 20. Busbar I 210 is located in the middle of the photovoltaic module. Solder ribbon II 320 connects the back electrodes of two adjacent cells 100 in battery string A 110 and battery string B 120. Busbar I 210 partially overlaps with the back of two adjacent cells 100 in battery string A 110 and battery string B 120, thereby enabling busbar I 210 to be hidden on the back of the cells 100.

[0095] In another example, as shown in Figures 9 and 10, Figure 9 illustrates a photovoltaic module with battery strings A 110 and B 120 connected in parallel, and Figure 10 is a top view of the photovoltaic module in Figure 9. Battery strings A 110 and B 120 are connected in parallel via solder ribbon II 320 and busbar I 210 from multiple busbars 20. Busbar I 210 is located in the middle of the photovoltaic module. Solder ribbon II 320 simultaneously connects the back electrodes of two adjacent cells 100 in battery strings A 110 and B 120. Busbar I 210 only overlaps with the back of the cell 100 in battery string A 110 (the cell 100 in battery string A 110 closest to battery string B 120), that is, busbar I 210 is located on the back of the cell 100 in battery string A 110 closest to battery string B 120, thereby enabling busbar I 210 to achieve the desired effect. 210 is hidden on the back of the battery cell 100.

[0096] In another example, as shown in Figures 11 and 12, Figure 11 illustrates a photovoltaic module with battery strings A 110 and B 120 connected in parallel, and Figure 12 is a top view of the photovoltaic module in Figure 11. Battery strings A 110 and B 120 are connected in parallel via solder ribbon II 320 and busbar I 210 from multiple busbars 20. Busbar I 210 is located in the middle of the photovoltaic module. Solder ribbon II 320 simultaneously connects the back electrodes of two adjacent cells 100 in battery strings A 110 and B 120. Busbar I 210 only overlaps with the back of the cell 100 in battery string B 120 (the cell 100 in battery string B120 closest to battery string A110). That is, busbar I 210 is located on the back of the cell 100 in battery string B120 closest to battery string A110, thereby enabling busbar I 210 to achieve the desired effect. 210 is hidden on the back of the battery cell 100.

[0097] Referring to Figure 6, with battery strings A110 and B120 connected in parallel, in the photovoltaic module, multiple battery strings A110 distributed along the second direction are arranged in pairs, and multiple battery strings B120 distributed along the second direction are also arranged in pairs. The two battery strings A110 in each pair are connected in series through the same busbar II220, and the two battery strings B120 in each pair are connected in series through a single busbar II220. In this way, series connection of the entire upper half, series connection of the lower half, and parallel connection of the upper and lower half of the photovoltaic module can be achieved.

[0098] Referring to Figure 6, in some embodiments, when the battery string A110 and battery string B120 are connected in parallel, the busbars II220 located at both ends of the photovoltaic module in the first direction can be hidden on the back of the battery cell 100.

[0099] As shown in Figure 6, in this configuration, the busbars II220 at both ends are respectively disposed on the back surfaces of the battery cells 100 at both ends (upper and lower ends) of the same battery string in the first direction. The busbar II220 at one end is connected to the electrode of the battery cell 100 at the end (lower end) of the battery string A110 via solder ribbon III330, and the busbar II220 at the other end is connected to the electrode of the battery cell 100 at the end (upper end) of the battery string B120 via solder ribbon IV340. That is, the busbar II220 at one end is disposed on the back surface of the battery cell 100 at the end of the battery string A110, and the busbar II220 at the other end is disposed on the back surface of the battery cell 100 at the end of the battery string B120. In other words, in this embodiment, the busbars II220 at both ends are hidden.

[0100] Of course, it is understood that in this disclosure, the busbar II 220 located at one end of the photovoltaic module may be hidden on the back of the cell 100, while the busbar II 220 located at the other end of the photovoltaic module may be located on the outside of the cell 100. For example, in some embodiments, the busbar II 220 located at one end of the photovoltaic module is disposed on the back of the cell 100 located at the end of the cell string A110 and is connected to the electrode of the cell 100 located at the end of the cell string A110 via solder ribbon III 330. The busbar II 220 located at the other end of the photovoltaic module is disposed on the outside of the cell 100 located at the end of the cell string B120 and is connected to the electrode of the cell 100 located at the end of the cell string B120 via solder ribbon IV 340. In such a case, the busbar II 220 located at one end of the photovoltaic module is hidden on the back of the cell 100.

[0101] Referring to Figure 13, further, in some embodiments, the busbar II 220 located at one end is disposed on the back side of the end cell 100 in the battery string A110. In such a case, in at least one row of battery strings (e.g., the odd-numbered row from left to right), the busbar II 220 hidden on the end cell 100 in the battery string A110 is connected to the front electrode of the cell 100. In such a case, the solder ribbon III 330 connects the front electrode of the cell 100 with the busbar II 220 and the busbar II 220. Since the front electrode is located on the front side and the busbar II 220 is located on the back side, in order to achieve the connection between the two, the solder ribbon III 330 can be bent from the front side to the back side of the end cell 100 in the battery string A110 to connect with the busbar II 220.

[0102] Referring to Figure 13, in this embodiment, since busbar II 220 needs to be connected to the front electrode via solder ribbon III 330, an insulating layer 130 is provided between busbar II 220 and the back side of the corresponding cell 100 to avoid leakage. That is, in at least one row of battery strings, an insulating layer 130 is provided between the busbar II 220 located on the back side of the cell 100 at the end of the battery string A110 and the back side of the cell 100, and the busbar II 220 and solder ribbon III 330 are insulated and isolated from the back electrode of the cell 100 through the insulating layer 130.

[0103] Referring to Figure 13, in some embodiments, in at least one row of battery strings (e.g., the odd-numbered row of battery strings from left to right), the solder strip III 330 has a first extension 331 extending to the back of the battery cell 100 located at the end of the battery string A110. The first extension 331 is connected to the busbar II 220. In the thickness direction of the photovoltaic module, the first extension 331 and the solder strip on the back of the battery cell 100 do not overlap.

[0104] Thus, the first extension 331 of the solder ribbon III330 does not overlap with the back electrode on the back side of the cell 100, which can reduce the stacking height during the lamination process, thereby reducing the risk of cracking caused by stress concentration, and also saving the amount of encapsulating film used.

[0105] Referring to Figure 6, in some embodiments, the busbar II220 located at one end is disposed on the back of the end cell 100 in the battery string A110, and the busbar II220 located at the other end is disposed on the back of the end cell 100 in the battery string B120.

[0106] In this configuration, in at least one row of battery strings (e.g., the odd-numbered row from left to right), solder ribbon III330 is connected to the front electrode of the end cell 100 in battery string A110, and solder ribbon III330 is bent from the front to the back of the end (lower end) cell 100 in battery string A110 to connect with busbar II220. Solder ribbon IV340 is connected to the front electrode of the end cell 100 in battery string B120, and solder ribbon IV340 is bent from the front to the back of the end (upper end) cell 100 in battery string B120 to connect with busbar II220.

[0107] Thus, by bending both solder strips III330 and IV340, they can be connected to the front electrode on the front side and the busbar II220 on the back side.

[0108] As shown in Figures 13 and 14, in order to avoid leakage, the busbar II 220 at both ends of the photovoltaic module in the first direction and the back of the cell 100 are provided with an insulating layer 130.

[0109] Furthermore, in such a case, in at least one row of battery strings (e.g., the odd-numbered row of battery strings from left to right), the solder ribbon III 330 has a first extension 331 extending on the back side of the end cell 100 in the battery string A110, the first extension 331 being connected to the busbar II 220, and in the thickness direction of the photovoltaic module, the first extension 331 and the solder ribbon on the back side of the cell 100 do not overlap; the solder ribbon IV 340 has a second extension 341 extending to the back side of the end cell 100 in the battery string B120, the second extension 341 being connected to the busbar II 220, and in the thickness direction of the photovoltaic module, the second extension 341 and the solder ribbon on the back side of the cell 100 do not overlap.

[0110] This reduces the stacking height during the lamination process, thereby reducing the risk of cracking caused by stress concentration, and also saves on the amount of encapsulating film used.

[0111] Please refer to Figure 15, where the busbar I210 is hidden on one of two adjacent cells 100 in cell strings A110 and B120. In some embodiments, the busbar I210 is located in the middle region of the photovoltaic module, on the back side of the cell 100 in cell string A110 that is closest to cell string B120.

[0112] In at least one row of battery strings (e.g., the even-numbered row of battery strings from left to right), busbar I210 is connected to the front electrodes of two adjacent battery cells 100 in battery string A110 and battery string B120 respectively via solder ribbon II320. Solder ribbon II320 connected to battery string A110 and solder ribbon II320 connected to battery string B120 are both bent from the front to the back of the battery cell 100 to connect to busbar I210.

[0113] Thus, by bending the solder ribbon II320, the connection between the busbar I210 and the front electrode of the cell 100 can be achieved while concealing the busbar I210.

[0114] Furthermore, in such an embodiment, an insulating layer 130 is also provided between the busbar I210 and the back of the battery cell 100.

[0115] In this way, insulation can be achieved between the busbar I210 connected to the front electrode and the back electrode of the battery cell 100, thus preventing leakage.

[0116] Furthermore, in some embodiments, the solder ribbon II 320 connected to the battery string A110 and the solder ribbon II 320 connected to the battery string B120 both have a third extension 321 extending to the front side of the battery cell 100 on which the busbar I210 is provided. In the thickness direction of the photovoltaic module, the third extension 321 does not overlap with the solder ribbon on the back side of the battery cell 100.

[0117] This reduces the stacking height during the lamination process, thereby reducing the risk of cracking caused by stress concentration, and also saves on the amount of encapsulating film used.

[0118] Referring to Figure 6, in some embodiments, busbar I210 may not be hidden, while at least one of the busbars II220 at both ends may be hidden. In such a case, battery strings A110 and B120 located in the same row are spaced apart in the first direction, with busbar I210 located in the gap between battery strings A110 and B120.

[0119] Busbar II220, located at one end of the photovoltaic module, is located outside the end cell 100 in the cell string A110 and is connected to the electrode of the end cell 100 in the cell string A110 via solder strip III330.

[0120] Busbar II220, located at the other end of the photovoltaic module, is located outside the end cell 100 in the cell string B120 and is connected to the electrode of the end cell 100 in the cell string B120 via solder strip III330.

[0121] Busbar I210 is located in the middle area of ​​the photovoltaic module. Busbar I210 is located on the back of the cell 100 closest to cell string B120 in cell string A110, or busbar I210 is located on the back of the cell 100 closest to cell string A110 in cell string B120, or busbar I210 overlaps with the back of the cell 100 closest to cell string B120 in cell string A110 and the back of the cell 100 closest to cell string A110 in cell string B120.

[0122] It should be noted that the photovoltaic module in this disclosure is not limited to including parallel battery strings A and multiple parallel battery strings B, but may also include other battery strings, such as multiple parallel battery strings C, multiple parallel battery strings D, etc. Taking a photovoltaic module that also includes battery string C as an example, multiple battery strings A, multiple battery strings B, and multiple parallel battery strings C are arranged side by side to obtain a cell array. Each row of cells in the cell array may include one battery string A, one battery string B, and one battery string C distributed along a first direction. Battery strings A, B, and C located in the same row may be connected in series or in parallel, and this disclosure does not make specific limitations.

[0123] Furthermore, in some embodiments, in at least one row of battery strings, at least one of the busbars II 220 is disposed on the back side of the battery cell 100 and connected to the back electrode of the battery cell 100. For example, in the odd-numbered rows of battery strings from left to right, at least one of the two busbars II 220 is disposed on the back side of the battery cell 100 and connected to the front electrode; in the even-numbered rows of battery strings from left to right, at least one of the two busbars II 220 is disposed on the back side of the battery cell 100 and connected to the back electrode. In such cases, in the even-numbered rows of battery strings, an insulating layer may not be provided between the busbars II 220 and the back side of the battery cell 100.

[0124] Furthermore, in this disclosure, the busbars I210 and II220 in different battery strings have the following two connection methods:

[0125] In the first configuration: In the odd-numbered rows of battery strings from left to right, busbar I210 is connected to the back electrode of the battery cell 100 closest to battery string B120 in battery string A110 and the battery cell 100 closest to battery string A110 in battery string B120. Both busbars II220 are connected to the front electrode of the battery cell 100. In the even-numbered rows of battery strings from left to right, busbar I210 is connected to the front electrode of the battery cell 100 closest to battery string B120 in battery string A110 and the battery cell 100 closest to battery string A110 in battery string B120. Both busbars II220 are connected to the back electrode of the battery cell 100.

[0126] The second configuration: In the even-numbered rows of battery strings from left to right, busbar I210 is connected to the back electrode of the battery cell 100 closest to battery string B120 in battery string A110 and the battery cell 100 closest to battery string A110 in battery string B120. Both busbars II220 are connected to the front electrode of the battery cell 100. In the odd-numbered rows of battery strings from left to right, busbar I210 is connected to the front electrode of the battery cell 100 closest to battery string B120 in battery string A110 and the battery cell 100 closest to battery string A110 in battery string B120. Both busbars II220 are connected to the back electrode of the battery cell 100.

[0127] This disclosure also provides a photovoltaic system, which includes the photovoltaic modules described above.

[0128] Specifically, the photovoltaic system also includes a glass panel, and the photovoltaic module also includes a glass panel. The glass panel has a receiving space in which the photovoltaic module is housed. The user cannot see the busbar II or the busbar I in the middle, which is hidden on the back of the solar cell, from the direction of the glass panel, thereby improving the overall aesthetics.

[0129] As can be seen from the above description, the embodiments of this disclosure achieve the following technical effects:

[0130] In this embodiment, a solder strip is placed between any two adjacent solar cells to connect them, thus achieving series connection between multiple solar cells in any solar cell string. Furthermore, at least one busbar is located on the back of the solar cell, allowing it to be hidden from view. This improves the aesthetics and compactness of the product while maintaining current flow. Hiding the busbar on the back of the solar cell also reduces the overall size of the photovoltaic module, making better use of its space and reducing overall cost. This solves the problems of poor aesthetics and low power generation per unit area in existing photovoltaic products.

[0131] In summary, in the photovoltaic module and photovoltaic system of this disclosure embodiment, the photovoltaic module includes: a cell array, the cell array including several rows of cell strings arranged side by side along a second direction, each row of cell strings including cell strings A110 and cell strings B120 distributed along a first direction, the cell strings A110 and B120 in each row of cell strings being connected in series or in parallel, and each cell string A110 and cell string B120 including several cell pieces 100 connected in series along the first direction, the second direction being perpendicular to the first direction; in cell string A110, the front electrode of one of two adjacent cell pieces 100 is connected to the back electrode of the other cell piece 100, and in cell string B120, the front electrode of one of two adjacent cell pieces 100 is connected to the back electrode of the other cell piece 100; and multiple busbars 20, at least one busbar 20 being disposed on the back of the cell piece 100.

[0132] In this way, at least one busbar can be hidden on the back of the solar cell, making it invisible to the user from the front. This improves the product's aesthetics and compactness while maintaining power delivery. Furthermore, hiding the busbar on the back of the solar cell allows for smaller overall photovoltaic module dimensions, making better use of the module's space and reducing overall cost. This solves the problem of poor aesthetics in existing photovoltaic products. It also increases the power generation per unit area of ​​the photovoltaic module.

[0133] In addition, in some embodiments, battery string A110 and battery string B120 are connected in series via solder strip I310.

[0134] In some embodiments, the multiple busbars 20 include busbars II220 disposed at two ends of the photovoltaic module in a first direction. The busbar II220 located at one end of the photovoltaic module is disposed on the back side of the end cell 100 in the battery string A110 and is connected to the electrode of the end cell 100 in the battery string A110 via solder ribbon III330. The busbar II220 located at the other end of the photovoltaic module is disposed on the outside of the end cell 100 in the battery string B120 and is connected to the electrode of the end cell 100 in the battery string B120 via solder ribbon IV340.

[0135] In some embodiments, the multiple busbars 20 include busbars II220 disposed at two ends of the photovoltaic module in a first direction. The two busbars II220 are respectively disposed on the back of the solar cells 100 at the two ends of the photovoltaic module in the first direction. The busbar II220 disposed at one end is connected to the electrode of the solar cell 100 located at the end of the solar cell string A110 via solder ribbon III330. The busbar II220 disposed at the other end is connected to the electrode of the solar cell 100 located at the end of the solar cell string B120 via solder ribbon I310.

[0136] In some embodiments, the multiple busbars 20 include a busbar I210 disposed in the middle of the photovoltaic module, and battery strings A110 and B120 located in the same row are connected in parallel to the busbar I210 via a solder strip II320.

[0137] In some embodiments, the busbar I210 is connected to the front electrode or back electrode of the battery cell 100 closest to the battery cell B120 in the battery string A110 and the battery cell 100 closest to the battery cell A110 in the battery string B120, respectively, via the same solder ribbon II320; or the busbar I210 is connected to the front electrode or back electrode of the battery cell 100 closest to the battery cell B120 in the battery string A110 and the battery cell 100 closest to the battery cell A110 in the battery string B120, respectively, via different solder ribbons II320.

[0138] In some embodiments, the multiple busbars 20 further include busbars II220 disposed at two ends of the photovoltaic module in a first direction, and at least one of the busbars I210 and busbars II220 is disposed on the back side of the cell 100.

[0139] In some embodiments, a busbar II 220 located at one end of the photovoltaic module is disposed on the back side of the end cell 100 in the battery string A110 and is connected to the electrode of the end cell 100 in the battery string A110 via a solder ribbon III 330; a busbar II 220 located at the other end of the photovoltaic module is disposed on the outside of the end cell 100 in the battery string B120 and is connected to the electrode of the end cell 100 in the battery string B120 via a solder ribbon IV 340.

[0140] In some embodiments, in at least one row of battery strings, solder ribbon III330 is connected to the front electrode of the battery cell 100 located at the end of the battery string A110, and solder ribbon III330 is bent from the front to the back of the battery cell 100 located at the end of the battery string A110 to connect with busbar II220.

[0141] In some embodiments, in at least one row of battery strings, an insulating layer 130 is provided between the busbar II220 disposed on the back side of the battery cell 100 located at the end of the battery string A110 and the back side of the battery cell 100.

[0142] In some embodiments, in at least one row of battery strings, the solder strip III330 has a first extension 331 extending to the back of the battery cell 100 located at the end of the battery string A110. The first extension 331 is connected to the busbar II220. In the thickness direction of the photovoltaic module, the first extension 331 and the solder strip on the back of the battery cell 100 do not overlap.

[0143] In some embodiments, busbars II220 located at both ends are respectively disposed on the back of the battery cells 100 at both ends of the same row of battery strings in a first direction. Busbar II220 located at one end is connected to the electrode of the battery cell 100 located at the end of the battery string A110 via solder ribbon III330, and busbar II220 located at the other end is connected to the electrode of the battery cell 100 located at the end of the battery string B120 via solder ribbon IV340.

[0144] In some embodiments, in at least one row of battery strings, solder ribbon III330 is connected to the front electrode of the battery cell 100 located at the end of the battery string A110, and solder ribbon III330 is bent from the front to the back of the battery cell 100 located at the end of the battery string A110 to connect with busbar II220; solder ribbon IV340 is connected to the front electrode of the battery cell 100 located at the end of the battery string B120, and solder ribbon IV340 is bent from the front to the back of the battery cell 100 located at the end of the battery string B120 to connect with busbar II220.

[0145] In some embodiments, in at least one row of battery strings, the busbars II220 at both ends of the photovoltaic module in the first direction and the back of the battery cell 100 are provided with an insulating layer.

[0146] In some embodiments, in at least one row of battery strings, solder ribbon III 330 has a first extension 331 extending on the back side of the battery cell 100 located at the end of the battery string A110, the first extension 331 being connected to busbar II 220, and the first extension 331 not overlapping with the solder ribbon on the back side of the battery cell 100 in the thickness direction of the photovoltaic module; solder ribbon IV 340 has a second extension 341 extending to the back side of the battery cell 100 located at the end of the battery string B120, the second extension 341 being connected to busbar II 220, and the second extension 341 not overlapping with the solder ribbon on the back side of the battery cell 100 in the thickness direction of the photovoltaic module.

[0147] In some embodiments, in at least one row of battery strings, at least one of the busbars II 220 is disposed on the back side of the battery cell 100 and connected to the back electrode of the battery cell 100.

[0148] In some embodiments, the busbar I210 is located in the middle region of the photovoltaic module, and the busbar I210 is disposed on the back side of the cell 100 closest to the cell string B120 in the cell string A110; or the busbar I210 is disposed on the back side of the cell 100 closest to the cell string A110 in the cell string B120.

[0149] In some embodiments, the busbar I210 is located in the middle region of the photovoltaic module, and the busbar I210 is disposed on the back side of the cell 100 closest to the cell string B120 in the cell string A110; in at least one row of cell strings, the busbar I210 is connected to the front electrode of two adjacent cells 100 in the cell string A110 and the cell string B120 respectively by solder ribbon II320, and the solder ribbon II320 connected to the cell string A110 and the solder ribbon II320 connected to the cell string B120 are both bent from the front side to the back side of the cell 100 to connect with the busbar I210.

[0150] In some embodiments, in at least one row of battery strings, an insulating layer is provided between the busbar I210 and the back of the battery cell 100.

[0151] In some embodiments, the solder ribbon II 320 connected to the battery string A110 and the solder ribbon II 320 connected to the battery string B120 both have a third extension 321 extending to the front side of the cell 100 on which the busbar I210 is provided. In the thickness direction of the photovoltaic module, the third extension 321 does not overlap with the solder ribbon on the back side of the cell 100.

[0152] In some embodiments, the busbar I210 overlaps with the back surface of the battery cell 100 closest to the battery cell B120 in the battery string A110 and the back surface of the battery cell 100 closest to the battery cell A110 in the battery string B120.

[0153] In some embodiments, battery strings A110 and B120 located in the same row are spaced apart in a first direction, and busbar I210 is located in the gap between battery strings A110 and B120.

[0154] In some embodiments, a busbar II 220 located at one end of the photovoltaic module is disposed outside the end cell 100 in the cell string A110 and connected to the electrode of the end cell 100 in the cell string A110 via solder ribbon III 330; a busbar II 220 located at the other end of the photovoltaic module is disposed outside the end cell 100 in the cell string B120 and connected to the electrode of the end cell 100 in the cell string B120 via solder ribbon III 330. Busbar I210 is located in the middle area of ​​the photovoltaic module. Busbar I210 is located on the back of the cell 100 closest to cell string B120 in cell string A110; or busbar I210 is located on the back of the cell 100 closest to cell string A110 in cell string B120; or busbar I210 overlaps with the back of the cell 100 closest to cell string B120 in cell string A110 and the back of the cell 100 closest to cell string A110 in cell string B120.

[0155] In some embodiments, in a photovoltaic module, multiple battery strings A110 distributed along the second direction are arranged in pairs, and multiple battery strings B120 distributed along the second direction are also arranged in pairs; the two battery strings A110 in each pair of battery strings A110 are connected in series through the same busbar II220, and the two battery strings B120 in each pair of battery strings B120 are connected in series through a busbar II220.

[0156] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the described embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0157] Furthermore, the above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A photovoltaic module, comprising: A battery cell array, comprising several rows of battery strings arranged side-by-side along a second direction, each row of battery strings comprising battery strings A (110) and B (120) distributed along a first direction, wherein battery strings A (110) and B (120) in each row are connected in series or in parallel, and each battery string A (110) and battery string B (120) comprises several battery cells (100) connected in series along the first direction, the second direction being perpendicular to the first direction; in battery string A (110), the front electrode of one of two adjacent battery cells (100) is connected to the back electrode of the other battery cell (100), and in battery string B (120), the front electrode of one of two adjacent battery cells (100) is connected to the back electrode of the other battery cell (100); and Multiple busbars (20), at least one busbar (20) is disposed on the back side of the battery cell (100).

2. The photovoltaic module according to claim 1, wherein, The battery string A (110) and the battery string B (120) are connected in series by solder strip I (310).

3. The photovoltaic module according to claim 2, wherein, The multiple busbars (20) include busbars II (220) disposed at two ends of the photovoltaic module in the first direction. The busbar II (220) located at one end of the photovoltaic module is disposed on the back side of the end cell (100) in the battery string A (110) and connected to the electrode of the end cell (100) in the battery string A (110) via solder ribbon III (330). The busbar II (220) located at the other end of the photovoltaic module is disposed on the outside of the end cell (100) in the battery string B (120) and connected to the electrode of the end cell (100) in the battery string B (120) via solder ribbon IV (340).

4. The photovoltaic module according to claim 2, wherein, The multiple busbars (20) include busbars II (220) disposed at two ends of the photovoltaic module in the first direction. Two busbars II (220) are respectively disposed on the back of the solar cells (100) at the two ends of the photovoltaic module in the first direction. The busbar II (220) disposed at one end is connected to the electrode of the solar cell (100) located at the end of the solar cell string A (110) via solder ribbon III (330). The busbar II (220) disposed at the other end is connected to the electrode of the solar cell (100) located at the end of the solar cell string B (120) via solder ribbon I (310).

5. The photovoltaic module according to claim 1, wherein, The multiple busbars (20) include busbar I (210) disposed in the middle of the photovoltaic module, and the battery string A (110) and the battery string B (120) located in the same row are connected in parallel with the busbar I (210) via solder strip II (320).

6. The photovoltaic module according to claim 5, wherein, The busbar I (210) is connected via the same solder strip II (320) to the front electrode of the cell (100) closest to the cell string B (120) in the cell string A (110) and the cell (100) closest to the cell string A (110) in the cell string B (120) respectively; or The busbar I (210) is connected to the back electrode of the battery cell (100) closest to the battery cell (120) in the battery string A (110) and the battery cell (100) closest to the battery string A (110) in the battery string B (120) via the same solder strip II (320).

7. The photovoltaic module according to claim 5, wherein, The busbar I (210) is connected to the front electrode of the battery cell (100) closest to the battery cell (120) in the battery string A (110) and the battery cell (100) closest to the battery string A (110) in the battery string B (120) respectively via different solder strips II (320); or The busbar I (210) is connected to the back electrode of the battery cell (100) closest to the battery cell (120) in the battery string A (110) and the battery cell (100) closest to the battery string A (110) in the battery string B (120) respectively via different solder strips II (320).

8. The photovoltaic module according to claim 6, wherein, The multiple busbars include busbar II (220) disposed at both ends of the photovoltaic module, the busbar II (220) being located on the back of the end of the solar cell (100) and connected to the solar cell (100) by solder strip III (330).

9. The photovoltaic module according to claim 5, wherein, The multiple busbars (20) also include busbars II (220) disposed at both ends of the photovoltaic module in the first direction, and at least one of the busbars I (210) and the busbars II (220) is disposed on the back side of the cell (100).

10. The photovoltaic module according to claim 9, wherein, The busbar II (220) located at one end of the photovoltaic module is disposed on the back side of the cell (100) located at the end of the cell string A (110) and is connected to the electrode of the cell (100) located at the end of the cell string A (110) via solder strip III (330). The busbar II (220) located at the other end of the photovoltaic module is disposed on the outside of the end cell (100) in the battery string B (120) and is connected to the electrode of the end cell (100) in the battery string B (120) by a solder strip IV (340).

11. The photovoltaic module according to claim 10, wherein, In at least one row of the battery strings, the solder strip III (330) is connected to the front electrode of the battery cell (100) located at the end of the battery string A (110), and the solder strip III (330) is bent from the front to the back of the battery cell (100) located at the end of the battery string A (110) to connect with the busbar II (220).

12. The photovoltaic module according to claim 10, wherein, In at least one row of the battery strings, an insulating layer (130) is provided between the busbar II (220) disposed on the back side of the battery cell (100) located at the end of the battery string A (110) and the back side of the battery cell (100).

13. The photovoltaic module according to claim 11, wherein, In at least one row of the battery strings, the solder strip III (330) has a first extension (331) extending to the back of the battery cell (100) located at the end of the battery string A (110), the first extension (331) being connected to the busbar II (220), and in the thickness direction of the photovoltaic module, the first extension (331) and the solder strip on the back of the battery cell (100) do not overlap.

14. The photovoltaic module according to claim 9, wherein, The busbars II (220) located at both ends are respectively disposed on the back of the battery cells (100) at both ends of the same row of battery strings in the first direction. The busbar II (220) located at one end is connected to the electrode of the battery cell (100) located at the end of the battery string A (110) via solder ribbon III (330), and the busbar II (220) located at the other end is connected to the electrode of the battery cell (100) located at the end of the battery string B (120) via solder ribbon IV (340).

15. The photovoltaic module according to claim 14, wherein, In at least one row of the battery strings, the solder strip III (330) is connected to the front electrode of the battery cell (100) located at the end of the battery string A (110), and the solder strip III (330) is bent from the front to the back of the battery cell (100) located at the end of the battery string A (110) to connect with the busbar II (220); The solder ribbon IV (340) is connected to the front electrode of the battery cell (100) located at the end of the battery string B (120), and the solder ribbon IV (340) is bent from the front to the back of the battery cell (100) located at the end of the battery string B (120) to connect with the busbar II (220).

16. The photovoltaic module according to claim 14, wherein, In at least one row of the battery strings, the back of the busbar II (220) and the battery cell (100) at both ends of the photovoltaic module in the first direction are provided with an insulating layer.

17. The photovoltaic module according to claim 15, wherein, In at least one row of the battery strings, the solder strip III (330) has a first extension (331) extending on the back side of the battery cell (100) at the end of the battery string A (110), the first extension (331) being connected to the busbar II (220), and in the thickness direction of the photovoltaic module, the first extension (331) and the solder strip on the back side of the battery cell (100) do not overlap. The solder strip IV (340) has a second extension (341) extending to the back of the end cell (100) in the battery string B (120), the second extension (341) being connected to the busbar II (220), and the second extension (341) not overlapping with the solder strip on the back of the cell (100) in the thickness direction of the photovoltaic module.

18. The photovoltaic module according to claim 9, wherein, In at least one row of the battery strings, at least one of the busbars II (220) is disposed on the back side of the battery cell (100) and connected to the back electrode of the battery cell (100).

19. The photovoltaic module according to any one of claims 9-18, wherein, The busbar I (210) is located in the middle region of the photovoltaic module, and the busbar I (210) is disposed on the back side of the cell (100) closest to the cell string B (120) in the cell string A (110); or The busbar I (210) is located on the back of the battery cell (100) closest to the battery cell (110) in the battery string B (120).

20. The photovoltaic module according to claim 19, wherein, The busbar I (210) is located in the middle region of the photovoltaic module, and the busbar I (210) is disposed on the back of the cell (100) closest to the cell string B (120) in the cell string A (110); In at least one row of the battery strings, the busbar I (210) is connected to the front electrodes of two adjacent battery cells (100) in the battery string A (110) and the battery string B (120) respectively via solder ribbon II (320). The solder ribbon II (320) connected to the battery string A (110) and the solder ribbon II (320) connected to the battery string B (120) are both bent from the front to the back of the battery cell (100) to connect to the busbar I (210).

21. The photovoltaic module according to claim 19, wherein, In at least one row of the battery strings, an insulating layer is provided between the busbar I (210) and the back of the battery cell (100).

22. The photovoltaic module according to claim 20, wherein, The solder strip II (320) connected to the battery string A (110) and the solder strip II (320) connected to the battery string B (120) both have a third extension (321) extending to the front side of the battery cell (100) on which the busbar I (210) is provided. In the thickness direction of the photovoltaic module, the third extension (321) does not overlap with the solder strip on the back side of the battery cell (100).

23. The photovoltaic module according to any one of claims 9-18, wherein, The back of the busbar I (210) overlaps with the back of the battery cell (100) closest to the battery cell (120) in the battery string A (110) and the back of the battery cell (100) closest to the battery cell (110) in the battery string B (120).

24. The photovoltaic module according to any one of claims 9-18, wherein, The battery string A (110) and the battery string B (120) located in the same row are spaced apart in the first direction, and the bus bar I (210) is located in the gap between the battery string A (110) and the battery string B (120).

25. The photovoltaic module according to claim 9, wherein, The busbar II (220) located at one end of the photovoltaic module is disposed on the outside of the end cell (100) in the battery string A (110) and is connected to the electrode of the end cell (100) in the battery string A (110) by solder strip III (330). The busbar II (220) located at the other end of the photovoltaic module is disposed on the outside of the end cell (100) in the battery string B (120) and is connected to the electrode of the end cell (100) in the battery string B (120) by solder strip III (330). The busbar I (210) is located in the middle region of the photovoltaic module, and the busbar I (210) is located on the back side of the cell (100) in the cell string A (110) closest to the cell string B (120); or The busbar I (210) is located on the back of the battery cell (100) closest to the battery cell (110) in the battery string B (120); or The back of the busbar I (210) overlaps with the back of the battery cell (100) closest to the battery cell (120) in the battery string A (110) and the back of the battery cell (100) closest to the battery cell (110) in the battery string B (120).

26. The photovoltaic module according to claim 9, wherein, In the photovoltaic module, multiple battery strings A (110) distributed along the second direction are arranged in pairs, and multiple battery strings B (120) distributed along the second direction are also arranged in pairs. The two battery strings A (110) in each pair of battery strings A (110) are connected in series through the same busbar II (220), and the two battery strings B (120) in each pair of battery strings B (120) are connected in series through one busbar II (220).

27. A photovoltaic system comprising the photovoltaic module as described in any one of claims 1 to 26.

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