Photovoltaic module and photovoltaic system

Abstract

The invention discloses a photovoltaic module and a photovoltaic system, the photovoltaic module comprises a plurality of battery strings electrically connected together, each battery string comprises a plurality of battery pieces with overlapped edges, and the battery strings have string contours; the plurality of battery strings comprise first battery strings and second battery strings, the string contours of the two first battery strings are the same, the string contours of the two second battery strings are the same, and the string contours of the first battery strings are different from the string contours of the second battery strings; the first battery string comprises M battery units, M is an integral multiple of 0.5, and each battery unit at least comprises two battery pieces. In the embodiment of the invention, the photovoltaic module comprises the first battery string and the second battery string with different string contours, and the first battery string and the second battery string can be quickly identified during production.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a photovoltaic system. Background Technology

[0002] A photovoltaic module includes multiple cell strings, busbars, and lead-out holes. A cell string includes multiple cells and solder strips connecting the cells in series. The solder strip at one end of the cell string is electrically connected to the middle busbar, and the end of the middle busbar leads out from the lead-out holes.

[0003] In related technologies, to prevent the solder strip from reaching the lead-out holes, two battery strings connecting from both sides to the same intermediate busbar are typically designed as different battery strings. However, in actual production, it is difficult to quickly identify different battery strings. Summary of the Invention

[0004] This invention provides a photovoltaic module and a photovoltaic system, aiming to at least solve the technical problem of difficulty in quickly identifying different cell strings in photovoltaic modules in related technologies.

[0005] This invention provides a photovoltaic module, including multiple battery strings electrically connected together, each battery string including multiple battery cells arranged with overlapping edges, and the battery string having a string profile;

[0006] The plurality of battery strings include a first battery string and a second battery string, wherein the two first battery strings have the same string profile, the two second battery strings have the same string profile, and the string profiles of the first battery strings and the second battery strings are different.

[0007] The first battery string includes M battery cells, where M is an integer multiple of 0.5, and each battery cell includes at least two battery cells.

[0008] In this embodiment of the invention, the photovoltaic module includes two types of battery strings with different outlines: a first battery string and a second battery string. During production, the first and second battery strings can be quickly identified without additional markings. Furthermore, during module installation, the top and bottom, as well as the positive and negative output terminals of the photovoltaic module, can be quickly identified based on their outlines. When the first battery string includes M battery cells, where M is an integer multiple of 0.5, and each battery cell includes at least two solar cells, and the first battery string comprises single, repeating battery cells, it is easier to identify during production and installation.

[0009] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present invention;

[0011] Figure 2 for Figure 1 A simplified schematic diagram of the provided photovoltaic module;

[0012] Figure 3 This is a schematic diagram of the structure of the first cell string in a photovoltaic module according to an embodiment of the present invention;

[0013] Figure 4 This is a schematic diagram of the structure of a second cell string in a photovoltaic module provided by an embodiment of the present invention;

[0014] Figure 5 This is a schematic diagram of the structure of the first cell string in another photovoltaic module provided by an embodiment of the present invention;

[0015] Figure 6 This is a schematic diagram of the structure of the second cell string in another photovoltaic module provided by an embodiment of the present invention;

[0016] Figure 7 This is a schematic diagram of the structure of a first battery cell provided in an embodiment of the present invention;

[0017] Figure 8 This is a schematic diagram of the structure of a third battery cell provided in an embodiment of the present invention;

[0018] Figure 9 This is a schematic diagram of the structure of a fourth battery cell provided in an embodiment of the present invention;

[0019] Figure 10 This is a schematic diagram of the structure of a second battery cell provided in an embodiment of the present invention;

[0020] Figure 11 This is a schematic diagram of the structure of a fifth battery cell provided in an embodiment of the present invention;

[0021] Figure 12 This is a schematic diagram of the incoming material structure provided in an embodiment of the present invention;

[0022] Figure 13 This is a schematic diagram of the arrangement of a first battery string according to an embodiment of the present invention;

[0023] Figure 14 A schematic diagram of a second battery string arrangement provided in an embodiment of the present invention;

[0024] Figure 15 A schematic diagram illustrating another arrangement of the first battery string provided in an embodiment of the present invention;

[0025] Figure 16A schematic diagram illustrating another arrangement of the second battery string provided in an embodiment of the present invention;

[0026] Figure 17 This is a schematic diagram of another incoming material structure provided in an embodiment of the present invention;

[0027] Figure 18 This is a schematic diagram illustrating another arrangement of the first battery string provided in an embodiment of the present invention;

[0028] Figure 19 This is a schematic diagram illustrating another arrangement of the second battery string provided in an embodiment of the present invention;

[0029] Figure 20 This is a schematic diagram of the structure of two adjacent first cell strings in a photovoltaic module provided by an embodiment of the present invention;

[0030] Figure 21 This is a schematic diagram of the structure of two adjacent second cell strings in a photovoltaic module provided by an embodiment of the present invention;

[0031] Figure 22 This is a schematic diagram of the structure near the elliptical lead-out hole of a photovoltaic module provided in an embodiment of the present invention;

[0032] Figure 23 This is a simplified schematic diagram of another photovoltaic module provided in an embodiment of the present invention.

[0033] Figure label:

[0034] 10-First battery string, 11-First solder strip, 20-Second battery string, 21-Second solder strip, 30-Battery cell, 31-First battery cell, 32-Second battery cell, 33-Third battery cell, 34-Fourth battery cell, 35-Fifth battery cell, 36-Sixth battery cell, 40-Connecting section, 41-Positive electrode connecting section, 42-Negative electrode connecting section, 50-First blank pattern, 60-Second blank pattern, 70-Elliptical lead hole, 80-Flat wire;

[0035] R1 - First region, R2 - Second region, C1 - First battery cell, C2 - Second battery cell, C3 - Third battery cell, C4 - Fourth battery cell. Detailed Implementation

[0036] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0037] Reference Figures 1 to 6 This invention discloses a photovoltaic module, including multiple battery strings electrically connected together. Each battery string includes multiple solar cells 30 arranged with overlapping edges. The battery string has a string profile formed by the outer edges of the multiple solar cells 30. The multiple battery strings include first battery strings 10 and second battery strings 20. The two first battery strings 10 have the same string profile, and the two second battery strings 20 have the same string profile. The string profiles of the first battery strings 10 and the second battery strings 20 are different. (Refer to...) Figure 3 and Figure 5 The first battery string 10 includes M battery cells, where M is an integer multiple of 0.5, and each battery cell includes at least two battery cells 30.

[0038] A single battery string may include an even number of battery cells 30 or an odd number of battery cells 30. Each battery cell 30 can be a back-contact cell with positive and negative electrodes on its back side; alternatively, it can be a double-sided electrode cell, such as a TOPcon cell or an HJT cell. Each battery cell 30 can be a cell with a main grid or a cell without a main grid. Each battery cell 30 can be a three-section, four-section, five-section, or six-section cell. Preferably, each battery cell 30 is a four-section cell, obtained by cutting a whole cell in half to obtain a half cell, and then cutting a half cell in half to obtain two four-section cells; alternatively, a whole cell can be three-sectioned to obtain four four-section cells. The width direction of each battery cell 30 is parallel to the length direction of the battery string.

[0039] In a battery string, multiple solar cells 30 are arranged in an overlapping manner, which increases the overall light-receiving area of ​​the module and improves the module power. The battery string may also include solder ribbons connecting multiple solar cells 30 in series. These solder ribbons can be flat solder ribbons, round wire solder ribbons, round flattened solder ribbons, coated solder ribbons, solder ribbons with elliptical or other polygonal cross-sections, multi-layer solder ribbons, etc. Flat solder ribbons are preferred because they distribute the pressure on the overlapping area more evenly, reducing the risk of microcracks at the cell overlap points. It should be understood that multiple solar cells 30 in a battery string can also be connected together via a conductive backsheet.

[0040] The string outline of a battery string does not include the solder ribbon or the electrode pattern on the battery cells 30. The string outline can be the outer contour of the pattern formed by the battery cells 30 included in a battery string. The string outline of the first battery string 10 is formed by the overlapping of all the battery cells 30 in the first battery string 10, and the string outline of the second battery string 20 is formed by the overlapping of all the battery cells 30 in the second battery string 20. Any two first battery strings 10 have the same string outline when their negative terminals face the same direction, for example, downwards. Any two second battery strings 20 have the same string outline when their negative terminals face the same direction, for example, upwards. The string outlines of the first battery string 10 and the second battery string 20 may differ, either entirely or partially.

[0041] Reference Figure 3 and Figure 5 The first battery string 10 comprises M battery cells. For example, Figure 3 In this configuration, a single battery cell comprises four battery cells 30, and the first battery string 10 comprises 5.5 battery cells, where 5.5 is 11 times 0.5. For example, Figure 5 In this configuration, a single battery cell comprises two battery cells 30, and the first battery string 10 comprises 11 battery cells, where 11 is 22 times the number of cells 0.5.

[0042] In this embodiment of the invention, the photovoltaic module includes two types of battery strings with different outlines: a first battery string 10 and a second battery string 20. During production, the first battery string 10 and the second battery string 20 can be quickly identified without additional markings. Furthermore, during module installation, the top and bottom, as well as the positive and negative output terminals of the photovoltaic module, can be quickly identified based on their outline appearance. When the first battery string 10 includes M battery cells, where M is an integer multiple of 0.5, and each battery cell includes at least two solar cells 30, the first battery string 10 includes single, repeating battery cells, making it easier to identify during production and installation.

[0043] Preferably, the first battery string 10 is composed of a single battery cell and a portion thereof.

[0044] In some embodiments, refer to Figure 1 and Figure 2 Along the length of the photovoltaic module, the photovoltaic module has a first region R1 and a second region R2; the first region R1 includes a plurality of first battery strings 10 arranged in parallel, and the second region includes a plurality of second battery strings 20 arranged in parallel.

[0045] The length direction of the photovoltaic module can be referenced. Figure 1 and Figure 2In the direction indicated by the X arrow, the first region R1 can be the upper part of the photovoltaic module, and the second region R2 can be the lower part of the photovoltaic module. The boundary line between the first region R1 and the second region R2 can be the center line extending along the width direction of the photovoltaic module. All cell strings in the first region R1 are first cell strings 10, and all cell strings in the second region R2 are second cell strings 20. Along the width direction of the photovoltaic module, the first region R1 may include six spaced and parallel first cell strings 10, and the second region R2 may include six spaced and parallel second cell strings 20. The width direction of the photovoltaic module can be referred to... Figure 1 and Figure 2 The direction indicated by the Y-arrow in the middle.

[0046] In this embodiment, different string types are not mixed in the same area of ​​the photovoltaic module, which facilitates the arrangement of the battery strings. During module installation, the top and bottom of the module can be quickly identified based on the first battery string 10 and the second battery string 20. For example, the part containing the first battery string 10 is the top part, and the part containing the second battery string 20 is the bottom part. After identifying the top and bottom of the module, the positive and negative output terminals of the module can be quickly identified. For example, in the module, the upper end of the two first battery strings 10 on the left side of the top part is the negative lead-out terminal, and the lower end is the positive lead-out terminal. The middle busbar electrically connected to the lower end of the two first battery strings 10 on the left side of the top part is the positive output lead.

[0047] In some embodiments, refer to Figure 1 The part containing the first battery string 10 is the upper part, and the part containing the second battery string 20 is the lower part. In the upper part, the upper ends of the two first battery strings 10 on the left are the negative terminals, and the upper ends of the other four first battery strings 10 in the upper part are the positive terminals. In the lower part, the lower ends of the two second battery strings 20 on the left are the negative terminals, and the lower ends of the other four second battery strings 20 in the lower part are the positive terminals.

[0048] In some embodiments, the second battery string 20 includes two types of battery cells with different profiles. In this case, the first battery string 10 has a single battery cell, while the second battery string 20 has two types of battery cells, so that the first and second battery strings can be quickly distinguished simply by the number of battery cells.

[0049] In some embodiments, refer to Figure 3The first battery string 10 includes a first battery unit C1, which includes four battery cells 30. The first battery unit C1 has a rectangular pattern with four chamfered corners, and there are no gaps between the four battery cells 30 in the first battery unit C1. In this embodiment, the four battery cells 30 in the first battery unit C1 have a rectangular pattern with four chamfered corners, that is, they are in the shape of a whole battery cell. These four battery cells 30 are cut from two halves. The electrode patterns on the upper and lower parts of the half battery cells are consistent, and the two half battery cells are arranged in a whole shape with symmetrical electrode patterns. Figure 12 As shown on the left side of the incoming material, at this point, only the order of the second and third battery cells needs to be changed. The number of reordering steps is small and there is no need to add a rotation process. The process is simple and time-saving.

[0050] The first battery string 10 preferably includes multiple first battery cells C1. The chamfer can be an angled chamfer, a rounded chamfer, etc. Each first battery cell C1 includes two chamfered cells and two right-angled cells. The chamfered cells have chamfers at both ends of one long side, and the right-angled cells have right angles at all four corners. The two cells at the ends of each first battery cell C1 are chamfered cells, and the two cells in the middle are right-angled cells. The first battery string 10 includes both chamfered and right-angled cells, which, compared to including only chamfered cells, reduces the light leakage area and improves the effective area utilization rate of the photovoltaic module.

[0051] When manufacturing the first battery string 10, the four battery pieces 30 cut from a whole battery cell can be used to manufacture the first battery unit C1 by swapping the positions of two of them. In the process of manufacturing multiple first battery units C1 within the first battery string 10, the four pieces cut from the whole battery cell can be fully utilized.

[0052] In some embodiments, the number of battery cells 30 in the first battery string 10 and the second battery string 20 is equal, and both are multiples of 2, not multiples of 4.

[0053] In some embodiments, refer to Figure 3 The first battery string 10 also includes a first sub-unit located at one end of the first battery string 10. The first sub-unit is half of the first battery unit C1. Specifically, the first sub-unit is either the front half or the back half of the first battery unit C1, rather than the splicing of any two battery cells 30 in the first battery unit C1. Each pair of first battery strings 10 can fully utilize an integer number of quarters obtained by cutting whole battery cells, which can avoid the waste of battery cells 30 to a certain extent. When the battery cell cutting process and the stacking process are continuous, excessive and prolonged temporary storage of cut battery cells can be avoided. Adjacent strings can fully utilize multiple quarters obtained by cutting multiple whole battery cells, and the stacking logic is simple.

[0054] The first sub-unit comprises two battery cells 30. The shape of the first sub-unit is formed by combining half of the battery cells 30 of the first battery cell C1, roughly half the shape of the first battery cell C1. That is, the first sub-unit is in the shape of a half-cell with chamfers. Half of the first battery cell C1 can be used directly as the first sub-unit, or it can be rotated before being used as the first sub-unit. It can be placed at the beginning of the string or directly at the end of the string.

[0055] The solar cell 30 has multiple connecting segments 40 for electrical connection with the welding strip; in the battery string, the multiple connecting segments 40 in the (N+1)th solar cell 30 are centrally symmetrical with the multiple connecting segments 40 in the Nth solar cell 30 to ensure that the welding strip extends in a straight line when it is welded in series with the solar cell 30. Each connecting segment 40 is a column composed of multiple connecting segments.

[0056] A connection array 40 includes a plurality of connection portions spaced apart along the width direction of the solar cell 30. The connection portions can be pads provided on the main grid electrode, pads provided on the fine grid electrode, or portions on the fine grid electrode used for electrical connection with solder strips. The plurality of connection arrays 40 include a positive electrode connection array 41 and a negative electrode connection array 42. The plurality of connection arrays 40 are centrally symmetrical, primarily in that the arrangement of the positive electrode connection array 41 and the negative electrode connection array 42 is centrally symmetrical, allowing for dimensional errors.

[0057] Reference Figure 12 In a photovoltaic module, the solar cells 30 are divided into first solar cells 31, second solar cells 32, third solar cells 33, and fourth solar cells 34 according to their shape and electrode patterns. Any two solar cells 30 among these four cells must have different shapes and electrode patterns. If there are no operations such as repositioning, rotation, or flipping after cutting, such as... Figure 12 On the left side, the first, third, second, and fourth solar cells are arranged in sequence. The first solar cell 31 and the fourth solar cell 34 can be chamfered solar cells, while the second solar cell 32 and the third solar cell 33 can be right-angled solar cells. For example... Figure 12 In G1, after the positions are swapped, the first, second, third and fourth battery cells are arranged in sequence. The multiple connecting columns 40 in the first battery cell 31 are centrally symmetrical with the multiple connecting columns 40 in the second battery cell 32. The multiple connecting columns 40 in the second battery cell 32 are centrally symmetrical with the multiple connecting columns 40 in the third battery cell 33. The multiple connecting columns 40 in the third battery cell 33 are centrally symmetrical with the multiple connecting columns 40 in the fourth battery cell 34.

[0058] Reference Figure 7The four battery cells 30 in the first battery unit C1 are the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34 arranged in sequence and overlapping. That is, the first battery string 10 includes the first battery cell 31, the second battery cell 32, the third battery cell 33 and the fourth battery cell 34 arranged in sequence and overlapping.

[0059] Reference Figure 12 One type of incoming material consists of four battery cells 30: a first battery cell 31, a third battery cell 33, a second battery cell 32, and a fourth battery cell 34. These four battery cells 30 can also be formed by cutting two half-cells of a battery cell, or by cutting two half-cells from a whole battery cell. Alternatively, these four battery cells 30 can be formed by cutting a whole battery cell into three parts. The plurality of connecting segments 40 in the first battery cell 31 are axially symmetrical with the plurality of connecting segments 40 in the third battery cell 33, and the plurality of connecting segments 40 in the second battery cell 32 are axially symmetrical with the plurality of connecting segments 40 in the fourth battery cell 34.

[0060] The positions of the third battery cell 33 and the second battery cell 32 in the incoming materials can be swapped to form a battery pack G1. The battery cells 30 in the battery pack G1 can be stacked and arranged to construct the first battery unit C1.

[0061] Reference Figure 13 One arrangement of the first battery string 10 is as follows: taking the first battery unit C1 as a unit, multiple first battery units C1 are arranged in overlapping order starting from the beginning of the previous battery string until the first half of the first battery unit C1 is arranged at the end of the string; then the remaining second half of the first battery unit C1 is arranged to the beginning of the next battery string, and then multiple first battery units C1 are arranged in overlapping order until the arrangement is completed; then, the solder strips on the previous battery string and the next battery string are arranged in mirror image; then, the next battery string is rotated 180 degrees so that the positive and negative orientations of the two battery strings are the same.

[0062] In other arrangements of the first battery string 10, multiple battery cells 30 from the first battery group G1 can be overlapped and arranged, and then multiple battery cells 30 from the next battery group G1 can be overlapped and arranged.

[0063] Reference Figure 15Another arrangement of the first battery string 10 is as follows: taking the first battery unit C1 as a unit, multiple first battery units C1 are arranged in overlapping order starting from the beginning of the previous battery string until the first half of the first battery unit C1 is arranged at the end of the string; then the remaining half of the first battery unit C1 is temporarily stored; taking the first battery unit C1 as a unit, multiple first battery units C1 are arranged in overlapping order starting from the beginning of the next battery string until a set number is arranged; then, the remaining half of the temporarily stored first battery unit C1 is rotated and arranged at the end of the next battery string; then, the solder strips on the previous and next battery strings are arranged.

[0064] In this embodiment, the above-described structure of the first battery string 10 allows the remaining half of the first battery units C1 from the previous battery string to be directly used in the preparation of the next battery string, or to be temporarily stored and rotated before being used in the preparation of the next battery string, without requiring the remaining half of the first battery units C1 to enter the recycling process, thus simplifying the process flow.

[0065] In some embodiments, refer to Figure 4 , Figure 8 and Figure 9 The second battery string 20 includes alternating third battery cells C3 and fourth battery cells C4, with the third and fourth battery cells arranged alternately, relative to... Figure 12 Regarding the arrangement of incoming solar cells on the left, only the positions of the first and fourth solar cells need to be changed. There is no need for complex operations such as flipping, rotating, and changing the positions of the solar cells multiple times. This reduces the number of position changes, omits complex processes such as flipping and rotating, reduces the difficulty of the process, and improves the efficiency of the stringing process.

[0066] Both the third battery unit C3 and the fourth battery unit C4 include two battery cells 30. The third battery unit C3 is a rectangle with four right angles, and the width of the rectangle is in the same direction as the length of the second battery string 20. The fourth battery unit C4 is a rectangle with four chamfered corners, and the width of the rectangle is in the same direction as the length of the second battery string 20.

[0067] In the third cell unit C3, each cell 30 has right angles at its corners, while in the fourth cell unit C4, the four corners are chamfered. The third cell unit C3 includes two right-angled cells, and the fourth cell unit C4 includes two chamfered cells. The second cell string 20 includes both chamfered and right-angled cells, which, compared to including only chamfered cells, reduces the light leakage area and improves the effective area utilization of the photovoltaic module.

[0068] In some embodiments, refer to Figure 4The second battery string 20 also includes a second sub-unit located at the first end of the second battery string 20 and a third sub-unit located at the second end of the second battery string 20. The second sub-unit is half of the third battery unit C3, and the third sub-unit is half of the fourth battery unit C4. Both the second and third sub-units include a battery cell 30. The battery cell 30 in the second sub-unit is a right-angled battery cell, while the battery cell 30 in the third sub-unit is a chamfered battery cell. The two have different shapes. By observing the type of battery cell 30 at both ends of the second battery string 20, the positive and negative ends of the second battery string 20 can be quickly identified.

[0069] Figure 4 In the second battery string 20, the first end is its lower end, and the second end is its upper end. Within the second battery string 20, the battery unit closest to the second end is the third battery unit C3, and the battery unit closest to the first end is the fourth battery unit C4. This ensures that, starting from the first battery piece 30 at the top, every four battery pieces 30 include two right-angled battery pieces and two chamfered battery pieces; that is, the incoming material corresponding to every four battery pieces 30 can be obtained by cutting a whole battery piece. The two ends of the second battery string 20 are respectively half of the third battery unit C3 and the fourth battery unit C4, allowing every two second battery strings 20 to fully utilize an integer number of quarters obtained from cutting a whole battery piece. This can, to some extent, avoid waste of battery pieces 30 and prevent excessive temporary storage of remaining battery pieces 30.

[0070] In some embodiments, refer to Figure 4 and Figure 10 The second battery string 20 includes multiple second battery units C2, each second battery unit C2 includes four battery cells 30, the four corners of the second battery unit C2 are right angles, the two battery cells 30 at the middle end of the second battery unit C2 have chamfers, the second battery unit C2 includes a third battery unit C3, and the two adjacent battery cells of two adjacent second battery units C2 form a fourth battery unit C4.

[0071] Reference Figure 10 The four battery cells 30 in the second battery unit C2 are the fourth battery cell 34, the third battery cell 33, the second battery cell 32 and the first battery cell 31 arranged in sequence and overlapping. That is, the second battery string 20 includes the fourth battery cell 34, the third battery cell 33, the second battery cell 32 and the first battery cell 31 arranged in sequence and overlapping.

[0072] Although the outlines of the first battery string 10 and the second battery string 20 are different, the types of battery cells 30 in both are relatively uniform. When arranging the first battery string 10 and the second battery string 20, the incoming materials can be the same. By controlling the arrangement of the battery cells 30 in the battery unit, the first battery string 10 and the second battery string 20 can be manufactured.

[0073] When arranging the second battery string 20, its incoming material is the same as that of the first battery string 10, that is... Figure 12 The incoming materials are shown.

[0074] Can Figure 12 The positions of the first battery cell 31 and the fourth battery cell 34 in the incoming material are swapped to form a battery pack G2. The battery cells 30 in the battery pack G2 can be stacked and arranged to construct the second battery unit C2.

[0075] Reference Figure 14 One arrangement of the second battery string 20 is as follows: taking the second battery unit C2 as a unit, multiple second battery units C2 are arranged in overlapping order starting from the beginning of the previous battery string until the first half of the second battery unit C2 is arranged at the end of the string; then the remaining second half of the second battery unit C2 is arranged to the beginning of the next battery string, and then multiple second battery units C2 are arranged in overlapping order until the arrangement is completed; then, the solder strips on the previous battery string and the next battery string are arranged in mirror image; then, the next battery string is rotated 180 degrees so that the positive and negative orientations of the two battery strings are the same.

[0076] In other arrangements of the second battery string 20, multiple battery cells 30 from the first battery pack G2 can be overlapped and arranged, and then multiple battery cells 30 from the next battery pack G2 can be overlapped and arranged.

[0077] Reference Figure 16 Another arrangement of the second battery string 20 is as follows: taking the second battery unit C2 as a unit, multiple second battery units C2 are arranged in overlapping order starting from the beginning of the previous battery string until the first half of the second battery unit C2 is arranged at the end of the string; then the remaining second half of the second battery unit C2 is temporarily stored; taking the second battery unit C2 as a unit, multiple second battery units C2 are arranged in overlapping order starting from the beginning of the next battery string until a set number is arranged; then, the remaining second half of the temporarily stored second battery unit C2 is rotated and arranged at the end of the next battery string; then, the solder strips on the previous and next battery strings are arranged.

[0078] In this embodiment, the above-described structure of the second battery string 20 allows the remaining half of the second battery unit C2 from the previous battery string to be directly used in the preparation of the next battery string or to be temporarily stored and rotated before being used in the preparation of the next battery string, without requiring the remaining half of the second battery unit C2 to enter the recycling process, thus simplifying the process flow.

[0079] In some embodiments, the overlap width of two adjacent battery cells 30 in the first battery cell C1 is a first width, and the overlap width of two adjacent first battery cells C1 is a second width, and the first width and the second width are not equal; the overlap width of two adjacent battery cells 30 in the second battery cell C2 is a third width, and the overlap width of two adjacent second battery cells C2 is a fourth width, and the third width and the fourth width are not equal.

[0080] The first, second, third, and fourth widths can all be greater than or equal to 0.2 mm and less than or equal to 1.2 mm. The first, second, third, and fourth widths are preferably between 0.3 mm and 0.7 mm. If the overlap width is too small, the pressed edge is prone to microcracks; if it is too large, it will obscure too many electrodes. In this application, the overlap width is 0.2 mm to 1.2 mm, which can avoid microcracks on the pressed edge and reduce electrode obstruction.

[0081] The first width can be greater than the second width, or the first width can be less than the second width. The absolute value of the difference between the first width and the second width can be less than or equal to 0.1 mm. The third width can be greater than the fourth width, or the third width can be less than the fourth width. The absolute value of the difference between the third width and the fourth width can be less than or equal to 0.1 mm.

[0082] The first battery unit C1 and the second battery unit C2 can be pre-built. After the first battery unit C1 and the second battery unit C2 are pre-built, multiple first battery units C1 and multiple second battery units C2 are stacked together. The overlap width of adjacent battery cells 30 in the first battery unit C1 and the second battery unit C2 may differ due to process errors. No additional adjustment is needed to make the two overlap widths completely equal.

[0083] In some embodiments, refer to Figure 3 In the first battery string 10, two battery pieces 30 are located at the first and second ends, respectively. One of the battery pieces 30 has a chamfer, meaning it is a chamfered battery piece, while the other battery piece 30 has four right angles, meaning it is a right angle battery piece. (Refer to...) Figure 4 In the second battery string 20, two battery pieces 30 are located at the first and second ends, respectively. One of the battery pieces 30 has a chamfer, meaning it is a chamfered battery piece, while the other battery piece 30 has four right angles, meaning it is a right-angled battery piece. In this embodiment, the positive and negative ends of the first battery string 10 and the second battery string 20 can be quickly identified by observing the type of the battery pieces 30 at both ends of the first battery string 10 and the second battery string 20.

[0084] In some embodiments, refer to Figure 3 and Figure 4 The two battery pieces 30 at the end of the first battery string 10 and the two battery pieces 30 at the end of the second battery string 20 have the same shape but are in reverse order.

[0085] With the negative terminal of the first battery string 10 as the end of the string, the corresponding negative terminal of the second battery string 20 is also the end of the string. Since the first battery string 10 and the second battery string 20 are connected in parallel, when the end of the first battery string 10 is its lower end, the end of the second battery string 20 is its upper end. The penultimate battery piece 30 of the first battery string 10 and the penultimate battery piece 30 of the second battery string 20 have the same shape, for example, both are right-angled battery pieces, and the penultimate battery piece 30 of the first battery string 10 and the penultimate battery piece 30 of the second battery string 20 have the same shape, for example, both are chamfered battery pieces. As an example, the lower end of the first battery string 10 is the tail, and the upper end of the second battery string 20 is the tail. In the two battery cells 30 at the tail of the first battery string 10, the last battery cell 30 is a right-angled cell, and the second-to-last battery cell 30 is a chamfered cell. Similarly, in the two battery cells 30 at the tail of the second battery string 20, the last battery cell 30 is a chamfered cell, and the second-to-last battery cell 30 is a right-angled cell. In this embodiment, by observing the order of the two battery cells 30 at the tail of the first battery string 10 and the second battery string 20, the first battery string 10 and the second battery string 20 can be quickly distinguished, facilitating the parallel connection of the first and second battery strings.

[0086] In some embodiments, multiple solar cells 30 in the first solar cell string 10 overlap sequentially, and multiple solar cells 30 in the second solar cell string 20 overlap sequentially; along the length direction of the photovoltaic module, the overlapping arrangement direction of the multiple solar cells 30 in the first solar cell string 10 is the same as the overlapping arrangement direction of the multiple solar cells 30 in the adjacent second solar cell string 20.

[0087] In some cases, the overlapping arrangement direction of multiple solar cells 30 in the first solar cell string 10 is the same as the overlapping arrangement direction of multiple solar cells 30 in the adjacent second solar cell string 20, pointing from the top to the bottom of the photovoltaic module. In this case, the solar cells 30 are stacked sequentially upwards from top to bottom in the entire photovoltaic module, with the second solar cell 30 overlapping the first solar cell 30, and the third solar cell 30 overlapping the second solar cell 30. Alternatively, in some cases, the overlapping arrangement direction of multiple solar cells 30 in the first solar cell string 10 is the same as the overlapping arrangement direction of multiple solar cells 30 in the adjacent second solar cell string 20, pointing from the bottom to the bottom of the photovoltaic module. In this case, the solar cells 30 are stacked sequentially upwards from bottom to top in the entire photovoltaic module.

[0088] In the manufacturing process of photovoltaic modules, the following steps are typically performed sequentially: front glass, front encapsulating film, cell strings arranged on the front encapsulating film, back encapsulating film, and backsheet or back glass. This laminated assembly is then heated and pressure is applied. The encapsulating film can be made of materials such as EVA (ethylene-vinyl acetate copolymer), POE (polyolefin elastomer), or EPE (expanded polyethylene). Because the cells 30 are aligned in the same direction along the entire length of the photovoltaic module, the extrusion and flow of the encapsulating film during lamination are consistent, reducing localized film aggregation, minimizing impact on overlapping areas, and reducing the formation of air bubbles.

[0089] In some embodiments, refer to Figure 15 Since the first battery cells C1 are pre-overlapping, when half of the remaining first battery cells C1 is rotated 180 degrees after the previous first battery string 10 is arranged and used for the arrangement of the next first battery string 10, the arrangement direction of the two battery pieces 30 at the ends of the first battery string 10 will be opposite to the arrangement direction of the other battery pieces in the first battery string 10. In this embodiment, the remaining half of the first battery cells C1, after rotation, is still used for arrangement at the end of the next first battery string 10, without changing the arrangement position of the remaining half of the first battery cells C1, for example, changing it to be arranged at the beginning of the string. Figure 15 The arrangement direction here can be the direction in which multiple battery cells 30 are stacked. For example, in the first battery string 10, the battery cells 30 are stacked sequentially from left to right, while the last two battery cells 30 are stacked sequentially from right to left.

[0090] In some embodiments, refer to Figure 16 Since the second battery cells C2 are pre-overlapping, when half of the remaining second battery cells C2 is rotated 180 degrees after the previous second battery string 20 is arranged and used for the arrangement of the next second battery string 20, the arrangement direction of the two battery pieces 30 at the ends of the second battery string 20 will be opposite to the arrangement direction of the other battery pieces in the second battery string 20. In this embodiment, the remaining half of the second battery cells C2, after rotation, is still used for arrangement at the end of the next second battery string 20, without changing the arrangement position of the remaining half of the second battery cells C2, for example, changing it to be arranged at the beginning of the string. Figure 16 The arrangement direction here can be the direction in which multiple battery cells 30 are stacked. For example, in the second battery string 20, the battery cells 30 are stacked sequentially from left to right, while the last two battery cells 30 are stacked sequentially from right to left.

[0091] In some embodiments, refer to Figure 5 and Figure 6Both the first battery string 10 and the second battery string 20 include multiple fifth battery units arranged in sequence, and each fifth battery unit includes two solar cells 30. The first battery string 10 or the second battery string 20 also includes a solar cell 30 located at one end, which is half of the fifth battery unit. Preferably, at both ends of the second battery string 20, the solar cells 30 located at the ends are both half of the fifth battery unit. In this embodiment, the battery units in the first battery string 10 and the second battery string 20 are of the same type. When manufacturing the battery strings, only one type of battery unit needs to be manufactured for the first and second battery strings of the entire photovoltaic module. There is no need to manufacture different battery units for different battery strings, which reduces the process difficulty and steps, thus improving the manufacturing efficiency of the battery strings.

[0092] In some embodiments, the fifth battery cell is a rectangle with four chamfered corners, and the wider side of the rectangle aligns with the length direction of the first or second battery string. The fifth battery cell includes two chamfered battery cells. (See reference) Figure 11 The fifth battery unit includes two chamfered battery cells, namely the fifth battery cell 35 and the sixth battery cell 36. The blank patterns in the first battery string 10 and the second battery string 20 are identical, resulting in a high overall aesthetic appeal of the assembly. This blank pattern is formed by two adjacent chamfers and can be triangular in shape, which is more aesthetically pleasing than irregular shapes. Two adjacent battery strings can also form a diamond-shaped blank pattern.

[0093] The solar cells 30 in the photovoltaic module are divided into the fifth solar cell 35 and the sixth solar cell 36 according to their shape and electrode pattern. Both the fifth solar cell 35 and the sixth solar cell 36 are chamfered solar cells. The multiple connecting columns 40 in the fifth solar cell 35 and the multiple connecting columns 40 in the sixth solar cell 36 are centrally symmetrical.

[0094] Reference Figure 17 One type of incoming material consists of four cells 30: the fifth cell 35, the sixth cell 36, the fifth cell 35, and the sixth cell 36. Each of these four cells 30 is a quarter cell.

[0095] Figure 17 The four solar cells from the incoming material can be directly assembled into battery pack G3. (Refer to...) Figure 18Another arrangement of the first battery string 10 is as follows: taking battery pack G3 as a unit, take multiple battery cells 30 from the first battery pack G3 and arrange them in an overlapping manner, then continue to take multiple battery cells 30 from the next battery pack G3 and arrange them in an overlapping manner, until the first half of the battery pack G3 is arranged at the end of the string; then temporarily store the remaining second half of the battery pack G3; taking battery pack G3 as a unit, take multiple battery cells 30 from the battery pack G3 and arrange them in an overlapping manner, then continue to take multiple battery cells 30 from the next battery pack G3 and arrange them in an overlapping manner, until the set number is arranged, then arrange the remaining second half of the battery pack G3 at the end of the next battery string; then, arrange the solder strips on the previous battery string and the next battery string.

[0096] The positions of the first two solar cells 30 and the last two solar cells 30 in the incoming material can be swapped to form battery pack G4. (Refer to...) Figure 19 Another arrangement of the second battery string 20 is as follows: taking battery pack G4 as a unit, take multiple battery cells 30 from the first battery pack G4 and arrange them in an overlapping manner, then continue to take multiple battery cells 30 from the next battery pack G4 and arrange them in an overlapping manner, until the first half of the battery pack G4 is arranged at the end of the string; then temporarily store the remaining second half of the battery pack G4; taking battery pack G4 as a unit, take multiple battery cells 30 from the battery pack G4 and arrange them in an overlapping manner, then continue to take multiple battery cells 30 from the next battery pack G4 and arrange them in an overlapping manner, until the set number is arranged, then arrange the remaining second half of the battery pack G4 at the end of the next battery string; then, arrange the solder strips on the previous battery string and the next battery string.

[0097] In some embodiments, refer to Figure 3 and Figure 4 The entire outline of the first battery string 10 is different from the entire outline of the second battery string 20, making it difficult to confuse the first battery string 10 and the second battery string 20 when distinguishing them.

[0098] In some embodiments, refer to Figure 5 and Figure 6 The outline of the first sub-region in the first battery string 10 is the same as the outline of the second sub-region in the second battery string 20. The lengths of the first sub-region and the second sub-region are equal and both are greater than or equal to half the length of the first battery string 10.

[0099] One of the first sub-regions can be referenced. Figure 5 As shown in R3, the first sub-region extends from the first cell 30 of the first battery string 10 to the third-to-last cell 30. A second sub-region can be referred to... Figure 6As shown in R4, the second sub-region extends from the second cell 30 to the penultimate cell 30 of the second battery string 20. In this embodiment, the first battery string 10 and the second battery string 20 are easily distinguishable, and their appearances are similar, resulting in a high overall aesthetic appeal of the assembly.

[0100] In some embodiments, along the length of the photovoltaic module, the photovoltaic module has a first region R1 and a second region R2; each cell string in the first region R1 is a first cell string 10, as shown in the reference. Figure 20 In the first region R1, adjacent battery strings form a first blank pattern 50, and in the second region R2, each battery string is a second battery string 20, as shown in the reference. Figure 21 In the second region R2, adjacent battery strings form a second blank pattern 60, and the area of ​​the first blank pattern 50 is larger than the area of ​​the second blank pattern 60.

[0101] The shapes of the first blank pattern 50 and the second blank pattern 60 can be different. The first blank pattern 50 refers to the pattern corresponding to the chamfered area in the blank space between two adjacent first battery strings 10, and the first blank pattern 50 can be rhomboid in shape. The second blank pattern 60 refers to the pattern corresponding to the chamfered area in the blank space between two adjacent second battery strings 20, and the second blank pattern 60 can be triangular in shape.

[0102] The first region R1 can be the upper part of the photovoltaic module, and the second region R2 can be the lower part of the photovoltaic module. During module installation, the upper and lower parts of the module can be quickly identified based on the difference between the first blank pattern 50 and the second blank pattern 60. For example, the part where the first blank pattern 50 is located is the upper part, and the part where the second blank pattern 60 is located is the lower part. After identifying the upper and lower parts of the module, the positive and negative output terminals of the module can be quickly identified.

[0103] In some embodiments, the ratio of the area of ​​the first blank pattern 50 to the area of ​​the second blank pattern 60 is 1.7-2.5.

[0104] The ratio of the area of ​​the first blank pattern 50 to the area of ​​the second blank pattern 60 can be 1.7, 1.9, 2.0, 2.1, 2.5, etc. A larger ratio of the area of ​​the first blank pattern 50 to the area of ​​the second blank pattern 60, that is, the area of ​​the second blank pattern 60 is significantly smaller than the area of ​​the first blank pattern 50, can reduce the light leakage area and improve the effective area utilization rate of the photovoltaic module.

[0105] In some embodiments, refer to Figure 22The photovoltaic module includes busbars. Both the first cell string 10 and the second cell string 20 include multiple solder strips. The solder strips in the first cell string 10 include first solder strips 11 for series-connected cells 30, and the solder strips in the second cell string 20 include second solder strips 21 for series-connected cells 30. The photovoltaic module includes a backsheet with an elliptical lead-out hole 70. Along the width direction of the photovoltaic module, the extension line of the first solder strip 11 adjacent to the elliptical lead-out hole 70 passes through the elliptical lead-out hole, and the extension line of the second solder strip 21 adjacent to the elliptical lead-out hole 70 also passes through the elliptical lead-out hole. The first solder strip 11 and the second solder strip 21 do not extend beyond the end cells 30. That is, there are no solder strips extending from the connecting section 40 near the elliptical lead-out hole 70 in the cell string. This ensures that the solder strips used to connect the busbars in the first and second cell strings are all far from the elliptical lead-out hole 70, thus minimizing interference and obstruction of the elliptical lead-out hole 70 by the solder strips.

[0106] In some embodiments, the photovoltaic module includes right-angled solar cells and chamfered solar cells with different profiles; see reference. Figure 1 , Figure 3 and Figure 4 Both the first battery string 10 and the second battery string 20 include right-angled battery cells and chamfered battery cells. Any two right-angled battery cells have the same area, and any two chamfered battery cells have the same area. The number of right-angled battery cells and the number of chamfered battery cells in the first battery string 10 and the second battery string 20 are equal.

[0107] In this embodiment, all four corners of the right-angled battery cell are right angles, while the two ends of one long side of the chamfered battery cell are chamfered, which can be an oblique chamfer, a rounded chamfer, etc. The first battery cell 31 and the fourth battery cell 34 are chamfered battery cells, while the second battery cell 32 and the third battery cell 33 are right-angled battery cells. In this embodiment, the number of right-angled battery cells and chamfered battery cells in the first battery string 10 and the second battery string 20 are equal, which helps to reduce current mismatch.

[0108] In the first battery string 10, the number of right-angled cells can be equal to the number of chamfered cells. In the second battery string 20, the number of right-angled cells can be equal to the number of chamfered cells. Both the first battery string 10 and the second battery string 20 include both right-angled and chamfered cells. Compared to including only chamfered cells, this reduces the light leakage area and improves the effective area utilization rate of the photovoltaic module.

[0109] In some embodiments, refer to Figure 5 and Figure 6The photovoltaic module includes chamfered solar cells. Both the first cell string 10 and the second cell string 20 include chamfered solar cells. The fifth cell 35 and the sixth cell 36 are also chamfered solar cells. The number of solar cells 30 in the first cell string 10 and the second cell string 20 is equal, and all of them are chamfered solar cells, which helps to reduce current mismatch.

[0110] In some embodiments, the difference between the length of the first battery string 10 and the length of the second battery string 20 is 0mm-10mm. The difference between the lengths of the first battery string 10 and the second battery string 20 can be 0mm, 1mm, 2mm, 5mm, 6mm, 10mm, etc. Preferably, the difference between the lengths of the first battery string 10 and the second battery string 20 is less than or equal to 5mm. In this embodiment, the lengths of the first battery string 10 and the second battery string 20 are substantially equal, which facilitates the arrangement of the first battery string 10 and the second battery string 20 into a battery string group.

[0111] In some embodiments, refer to Figure 2 In the first region R1, battery strings a and b are connected in parallel to form a first string group, and battery strings c and d are connected in parallel to form a second string group. The first string group and the second string group are connected in series. Battery strings e and f are connected in parallel and then electrically connected to the flat conductor 80 in the photovoltaic module. The electrical connection of the battery strings in the second region R2 is the same as that in the first region R1, and the battery strings in the first region R1 and the second region R2 are connected in parallel.

[0112] From left to right of the photovoltaic module, the six cell strings in the first region R1 are, in order, cell string a, cell string b, cell string c, cell string d, cell string e, and cell string f. Similarly, the six cell strings in the second region R2 are, in order, second cell string a, second cell string b, second cell string c, second cell string d, second cell string e, and second cell string f. In this embodiment, the first cell string 10 and the second cell string 20, which have different string profiles, are connected in parallel, not in series, to avoid affecting current matching.

[0113] In some embodiments, refer to Figure 23 Along the length of the photovoltaic module, the photovoltaic module has a first region R1 and a second region R2. The cell strings in the first region R1 and the second region R2 are of the same type, for example, both are first cell strings 10. All cell strings in the first region R1 are connected in parallel, and the electrical connection of the cell strings in the second region R2 is the same as above, while the cell strings in the first region R1 and the second region R2 are connected in series.

[0114] This invention also provides a photovoltaic system, which includes photovoltaic modules of any or a combination of the above embodiments.

[0115] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0116] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the present invention, and all of these modifications are within the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that, It includes multiple battery strings electrically connected together, each battery string comprising multiple battery cells arranged with overlapping edges, and the battery string having a string profile; The plurality of battery strings include a first battery string and a second battery string, wherein the two first battery strings have the same string profile, the two second battery strings have the same string profile, and the string profiles of the first battery strings and the second battery strings are different. The first battery string includes M battery cells, where M is an integer multiple of 0.5, and each battery cell includes at least two battery cells.

2. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module has a first region and a second region; The first region includes a plurality of first battery strings arranged in parallel, and the second region includes a plurality of second battery strings arranged in parallel.

3. The photovoltaic module according to claim 1, characterized in that, The second battery string includes two types of battery cells with different profiles.

4. The photovoltaic module according to claim 1, characterized in that, The first battery string includes a first battery unit, which includes four battery cells. The first battery unit is a rectangular pattern with four chamfers and there are no gaps between the four battery cells in the first battery unit.

5. The photovoltaic module according to claim 4, characterized in that, The first battery string also includes a first sub-unit located at one end of the first battery string, the first sub-unit being half of the first battery unit.

6. The photovoltaic module according to claim 1, characterized in that, The second battery string includes alternating third and fourth battery units, each of which includes two battery cells; The third battery unit is a rectangle with four right angles, and the width of the rectangle is in the same direction as the length of the second battery string. The fourth battery unit is a rectangle with four chamfered corners, and the width of the rectangle is aligned with the length of the second battery string.

7. The photovoltaic module according to claim 6, characterized in that, The second battery string further includes a second sub-unit located at the first end of the second battery string and a third sub-unit located at the second end of the second battery string, wherein the second sub-unit is half of the third battery unit and the third sub-unit is half of the fourth battery unit.

8. The photovoltaic module according to any one of claims 1-7, characterized in that, The two battery cells at the end of the first battery string and the two battery cells at the end of the second battery string have the same shape but are in reverse order.

9. The photovoltaic module according to any one of claims 1-7, characterized in that, The first battery string includes a first battery cell, a second battery cell, a third battery cell, and a fourth battery cell arranged in sequence and overlapping. The second battery string includes the fourth battery cell, the third battery cell, the second battery cell, and the first battery cell arranged in sequence and overlapping.

10. The photovoltaic module according to any one of claims 1-7, characterized in that, In the first battery string, multiple battery cells overlap sequentially; in the second battery string, multiple battery cells overlap sequentially. Along the length of the photovoltaic module, the overlapping arrangement direction of the multiple cells in the first battery string is the same as the overlapping arrangement direction of the multiple cells in the adjacent second battery string.

11. The photovoltaic module according to any one of claims 1-7, characterized in that, The arrangement direction of the two battery cells at the ends of the first battery string is opposite to the arrangement direction of the other battery cells in the first battery string; And / or, the arrangement direction of the two end cells in the second battery string is opposite to the arrangement direction of the other cells in the second battery string.

12. The photovoltaic module according to claim 1, characterized in that, Both the first battery string and the second battery string include multiple fifth battery units arranged in sequence. Each fifth battery unit includes two battery cells and is a rectangle with four chamfered corners. The width of the rectangle is consistent with the length direction of the first battery string or the second battery string. The first battery string or the second battery string also includes a battery cell located at the end, which is half of the fifth battery cell.

13. The photovoltaic module according to any one of claims 1-7, characterized in that, Along the length of the photovoltaic module, the photovoltaic module has a first region and a second region; Adjacent battery strings in the first region form a first blank pattern, and adjacent battery strings in the second region form a second blank pattern. The area of ​​the first blank pattern is larger than the area of ​​the second blank pattern.

14. The photovoltaic module according to claim 13, characterized in that, The ratio of the area of ​​the first blank pattern to the area of ​​the second blank pattern is 1.7-2.

5.

15. The photovoltaic module according to any one of claims 1-7, characterized in that, Both the first battery string and the second battery string include multiple solder strips. The multiple solder strips in the first battery string include first solder strips for series-connected battery cells, and the multiple solder strips in the second battery string include second solder strips for series-connected battery cells. The photovoltaic module includes a backsheet, on which an elliptical lead-out hole is formed. Along the width direction of the photovoltaic module, the extension line of the first solder strip adjacent to the elliptical lead-out hole passes through the elliptical lead-out hole. The extension line of the second solder strip adjacent to the elliptical lead-out hole passes through the elliptical lead-out hole.

16. The photovoltaic module according to any one of claims 1-7, characterized in that, The photovoltaic module includes right-angled solar cells and chamfered solar cells with different profiles; Both the first battery string and the second battery string include the right-angled battery pieces and the chamfered battery pieces. The two right-angled battery pieces have the same area, and the two chamfered battery pieces have the same area. The number of right-angled battery pieces and the number of chamfered battery pieces in the first battery string and the second battery string are equal.

17. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module has a first region and a second region. Battery strings a and b in the first region are connected in parallel to form a first string group, and battery strings c and d are connected in parallel to form a second string group. The first string group and the second string group are connected in series, and battery strings e and f are connected in parallel and then electrically connected to the flat wires in the photovoltaic module. The battery strings in the second region have the same electrical connections as those in the first region, and the battery strings in the first and second regions are connected in parallel.

18. A photovoltaic system, characterized in that, Including the photovoltaic module as described in any one of claims 1 to 17.

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