Battery assembly and photovoltaic system

Abstract

Provided in the present disclosure are a battery assembly and a photovoltaic system. A solar cell comprises a first surface and a second surface, wherein a first finger and a first solder ribbon are located on the first surface, a second finger and a second solder ribbon are located on the second surface, and the first finger extends in a second direction; the first solder ribbon extends in a fourth direction, and the first solder ribbon is electrically connected to a second solder ribbon of an adjacent solar cell; and an included angle between the second direction and the fourth direction is an acute angle.

Description

Battery assembly and photovoltaic system

[0001] Cross-reference to Related Applications

[0002] The present disclosure claims priority to the Chinese patent application No. 202411369652.2, filed on September 29, 2024, with the State Intellectual Property Office of China, and entitled "A solar cell assembly and photovoltaic system", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure belongs to the technical field of solar cells, and in particular relates to a solar cell assembly and photovoltaic system. BACKGROUND

[0004] At present, a solar cell is a semiconductor device that directly converts the energy of sunlight into electrical energy, and a metal grid line is used to collect and transmit current. However, in the related art, a solder strip is connected with the grid line, and a small contact area causes a large resistance and a large electrical loss. Both the solder strip and the grid line cause shading loss, which affects the photoelectric conversion efficiency of the solar cell. SUMMARY

[0005] The present disclosure provides a solar cell assembly and photovoltaic system, aiming to solve the problem that a solder strip is easily separated from a cell piece during use of a photovoltaic cell.

[0006] The solar cell assembly provided by the present disclosure includes a cell string, the cell string includes a plurality of cell pieces, the plurality of cell pieces are arranged along a first direction, the cell piece includes a first surface and a second surface opposite to each other, the plurality of cell pieces include a first cell piece and a second cell piece arranged adjacent to each other; a plurality of first fine grid lines are arranged on the first surface of the cell piece, a plurality of second fine grid lines are arranged on the second surface of the cell piece, the first fine grid lines extend along a second direction, and the first fine grid lines are arranged along a third direction at intervals; a plurality of first solder strips are arranged on the first surface of the cell piece, a plurality of second solder strips are arranged on the second surface of the cell piece, the first solder strips extend along a fourth direction and are arranged along the third direction at intervals, the first solder strips are electrically connected with the first fine grid lines, and the first solder strip of the first cell piece and the second solder strip of the second cell piece are directly or indirectly electrically connected.

[0007] In the present disclosure, an angle α between the second direction and the fourth direction is an acute angle.

[0008] In the solar cell module of the embodiments of the present disclosure, the cell string comprises a plurality of cell pieces, the plurality of cell pieces are arranged in a first direction, the cell piece comprises a first surface and a second surface opposite to each other, the plurality of cell pieces comprises a first cell piece and a second cell piece arranged adjacently; a plurality of first fine grids are arranged on the first surface of the cell piece, a plurality of second fine grids are arranged on the second surface of the cell piece, the first fine grids extend in a second direction, and the first fine grids are arranged in a third direction at intervals; a plurality of first solder strips are arranged on the first surface of the cell piece, a plurality of second solder strips are arranged on the second surface of the cell piece, the first solder strips extend in a fourth direction, and the first solder strips are arranged in the third direction at intervals, the first solder strips are electrically connected with the first fine grids, and the first solder strips of the first cell piece and the second solder strips of the second cell piece are directly or indirectly electrically connected; wherein an included angle α between the second direction and the fourth direction is an acute angle. In this way, the solder strips and the fine grids are arranged at an acute angle, so as to increase the contact area of the solder strips and the fine grids, thereby reducing the resistance and improving the conduction efficiency. Meanwhile, the solder strips and the grid lines almost coincide together, so as to reduce the light blocking loss and improve the photoelectric conversion efficiency of the solar cell module.

[0009] In some embodiments, the first solder strips on the first surface of the first cell piece and the second solder strips on the second surface of the adjacent second cell piece are an integral continuous structure.

[0010] In some embodiments, the second fine grids of the second cell piece extend in a fifth direction, the second solder strips extend in a sixth direction, and the second solder strips are electrically connected with the second fine grids in cross.

[0011] In some embodiments, an included angle β between the fifth direction and the sixth direction is an acute angle.

[0012] In some embodiments, the second surface of the second cell piece is provided with a plurality of main grids, and the second solder strips on the second surface of the second cell piece are electrically connected with the main grids in cross.

[0013] In some embodiments, the first solder strips on the first surface of the first cell piece and the second solder strips on the second surface of the adjacent second cell piece are a non-integral continuous structure, and the first solder strips and the second solder strips are electrically connected through a bus bar.

[0014] In some embodiments, the bus bar connecting the first solder strips of the first cell piece and the second solder strips of the adjacent second cell piece is located between the first cell piece and the second cell piece.

[0015] In some embodiments, the bus bar connecting the first solder strips of the first cell piece and the second solder strips of the adjacent second cell piece is located on the second surface of the second cell piece.

[0016] In some embodiments, the first solder strips of the first cell piece and the second solder strips of the second cell piece are connected on the same surface or opposite surfaces of the bus bar.

[0017] In some embodiments, the first solder strip of the first cell tab and the second solder strip of the second cell tab are electrically connected to the busbar by conductive adhesive or solder joint.

[0018] In some embodiments, the first solder strip is a flat solder strip or a round solder strip or a triangular solder strip, and the second solder strip is a flat solder strip or a round solder strip or a triangular solder strip.

[0019] In some embodiments, the width of the round solder strip along the third direction is 0.05mm-0.3mm.

[0020] In some embodiments, the width of the flat solder strip along the third direction is 0.2mm-0.6mm.

[0021] In some embodiments, the width of the base of the triangular solder strip along the third direction is 0.05mm-0.3mm.

[0022] In some embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0

[0023] wherein L is the total length of the first cell tab and the last cell tab along the first direction, and D is the width of the cell tab along the third direction.

[0024] In some embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0

[0025] In some embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0

[0026] In some embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0

[0027] In some embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0

[0028] In some embodiments, the angle b between the fifth direction and the sixth direction satisfies the following relationship: 0

[0029] wherein L is the total length of the first cell tab and the last cell tab along the first direction, and D is the width of the cell tab along the third direction.

[0030] In some embodiments, the angle b between the fifth direction and the sixth direction satisfies the following relationship: 0

[0031] In some embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 100L.

[0032] In some embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 150L.

[0033] In some embodiments, the included angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 250L.

[0034] The photovoltaic system provided by the embodiments of the present disclosure includes the solar cell module of any one of the above embodiments.

[0035] In the solar cell module and the photovoltaic system of the embodiments of the present disclosure, the cell string includes a plurality of cell pieces, the plurality of cell pieces are arranged along a first direction, the cell piece includes a first surface and a second surface opposite to each other, the plurality of cell pieces include a first cell piece and a second cell piece arranged adjacent to each other; a plurality of first fine grids are arranged on the first surface of the cell piece, a plurality of second fine grids are arranged on the second surface of the cell piece, the first fine grids extend along a second direction, and the first fine grids are arranged along a third direction at intervals; a plurality of first solder bands are arranged on the first surface of the cell piece, a plurality of second solder bands are arranged on the second surface of the cell piece, the first solder bands extend along a fourth direction and are arranged along the third direction at intervals, the first solder bands are electrically connected with the first fine grids, and the first solder bands of the first cell piece and the second solder bands of the second cell piece are directly or indirectly electrically connected; wherein the included angle α between the second direction and the fourth direction is an acute angle. In this way, the solder bands and the fine grids are arranged at an acute angle, so as to increase the contact area of the solder bands and the fine grids, thereby reducing the resistance and improving the conduction efficiency. At the same time, the solder bands and the grid lines almost coincide together, so as to reduce the light blocking loss and improve the photoelectric conversion efficiency of the solar cell module. BRIEF DESCRIPTION OF DRAWINGS

[0036] FIG. 1 is a partial structure schematic diagram of a solar cell module according to an embodiment of the present disclosure;

[0037] FIG. 2 is another partial structure schematic diagram of a solar cell module according to an embodiment of the present disclosure;

[0038] FIG. 3 is another partial structure schematic diagram of a solar cell module according to an embodiment of the present disclosure;

[0039] FIG. 4 is a module structure schematic diagram of a solar cell module according to an embodiment of the present disclosure;

[0040] FIG. 5 is still another partial structure schematic diagram of a solar cell module according to an embodiment of the present disclosure;

[0041] FIG. 6 is still another partial structure schematic diagram of a solar cell module according to an embodiment of the present disclosure;

[0042] Fig. 7 is a schematic diagram of another partial structure of a solar cell module according to an embodiment of the present disclosure;

[0043] Fig. 8 is a schematic diagram of another partial structure of a solar cell module according to an embodiment of the present disclosure;

[0044] Fig. 9 is a schematic diagram of another partial structure of a solar cell module according to an embodiment of the present disclosure;

[0045] Fig. 10 is a schematic diagram of another partial structure of a solar cell module according to an embodiment of the present disclosure;

[0046] Fig. 11 is a schematic diagram of another partial structure of a solar cell module according to an embodiment of the present disclosure;

[0047] Fig. 12 is a schematic diagram of another partial structure of a solar cell module according to an embodiment of the present disclosure;

[0048] Fig. 13 is a schematic diagram of a module structure of a photovoltaic system according to an embodiment of the present disclosure.

[0049] Main element symbol explanation: solar cell module 100, cell sheet 10, first cell sheet 101, second cell sheet 102, first surface 11, second surface 12, first fine grid 13, second fine grid 14, main grid 15, first solder strip 21, second solder strip 22, busbar 30, cell string 200, photovoltaic system 300. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in combination with the drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present disclosure, and cannot be understood as a limitation of the present disclosure. In addition, it should be understood that the specific embodiments described herein are only used to explain the present disclosure and cannot be used to limit the present disclosure.

[0051] In the description of the present disclosure, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present disclosure and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present disclosure.

[0052] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and do not imply or suggest relative importance or a number of the indicated technical features. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0053] In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can be detachable connection, or integrally connected; can be mechanical connection, or electrical connection or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0054] In the present disclosure, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0055] The following disclosure provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0056] In the related art, a solar cell is a kind of semiconductor device that directly converts the energy of sunlight into electrical energy. However, in the prior art, the welding band is connected with the grid line, and the small contact area will cause large resistance and large electrical loss. Both the welding band and the grid line will cause shading loss, affecting the photoelectric conversion efficiency of the solar cell. In the embodiments of the present disclosure, the welding band and the fine grid can be arranged at an acute angle to increase the contact area of the welding band and the fine grid, thereby reducing the resistance and improving the conduction efficiency. At the same time, the welding band and the grid line almost coincide together, reducing the shading loss and improving the photoelectric conversion efficiency of the solar cell module.

[0057] Embodiment one

[0058] Referring to FIGS. 1-4, the solar cell module 100 provided by the present disclosure includes a cell string 200, the cell string 200 includes a plurality of cell pieces 10, the plurality of cell pieces 10 are arranged along a first direction, the cell piece 10 includes a first face 11 and a second face 12 opposite to each other, the plurality of cell pieces 10 include a first cell piece 101 and a second cell piece 102 arranged adjacent to each other; a plurality of first fine grids 13 are arranged on the first face 11 of the cell piece 10, a plurality of second fine grids 14 are arranged on the second face 12 of the cell piece 10, the first fine grid 13 extends along a second direction, and the first fine grid 13 is arranged along a third direction at intervals; a plurality of first welding bands 21 are arranged on the first face 11 of the cell piece 10, a plurality of second welding bands 22 are arranged on the second face 12 of the cell piece 10, the first welding band 21 extends along a fourth direction and is arranged along the third direction at intervals, the first welding band 21 is electrically connected with the first fine grid 13, and the first welding band 21 of the first cell piece 101 and the second welding band 22 of the second cell piece 102 are directly or indirectly electrically connected; wherein the included angle a between the second direction and the fourth direction is an acute angle.

[0059] In the solar cell module 100 of the embodiment of the present disclosure, the cell string 200 includes a plurality of cell pieces 10, the plurality of cell pieces 10 are arranged along a first direction, the cell piece 10 includes a first surface 11 and a second surface 12 opposite to each other, the plurality of cell pieces 10 include a first cell piece 101 and a second cell piece 102 arranged adjacent to each other; a plurality of first fine grids 13 are arranged on the first surface 11 of the cell piece 10, a plurality of second fine grids 14 are arranged on the second surface 12 of the cell piece 10, the first fine grids 13 extend along a second direction, and the first fine grids 13 are arranged spaced apart along a third direction; a plurality of first solder strips 21 are arranged on the first surface 11 of the cell piece 10, a plurality of second solder strips 22 are arranged on the second surface 12 of the cell piece 10, the first solder strips 21 extend along a fourth direction and are arranged spaced apart along the third direction, the first solder strips 21 are electrically connected with the first fine grids 13, and the first solder strips 21 of the first cell piece 101 and the second solder strips 22 of the second cell piece 102 are directly or indirectly electrically connected; and an included angle a between the second direction and the fourth direction is an acute angle. In this way, the solder strips and the fine grids are arranged at an acute angle, so as to increase the contact area between the solder strips and the fine grids, thereby reducing the resistance and improving the conduction efficiency. Meanwhile, the solder strips and the grid lines almost coincide together, so as to reduce the light blocking loss and improve the photoelectric conversion efficiency of the solar cell module 100.

[0060] In the embodiment, the first surface 11 of the cell piece 10 is used for receiving light, and the second surface 12 of the cell piece 10 is a back surface. The first doped layer and the second doped layer of the cell piece 10 can be arranged on the first surface 11 and the second surface 12 respectively. The first surface 11 of the first cell piece 101 is connected with the second surface 12 of the second cell piece 102 through the first solder strips 21 and the second solder strips 22, that is, the first doped layer of the first cell piece 101 can be connected with the second doped layer of the second cell piece 102. Meanwhile, the first doped layer of the second cell piece 102 is connected with the second doped layer of another adjacent cell piece 10, and so on, so as to form the cell string 200 arranged along the first direction. Of course, in some embodiments, the solder strips at the end of the cell string 200 can be connected with only one doped layer, and extend relative to the cell piece 10 to connect with a bus bar or the like, so as to realize the conduction of current.

[0061] It can be understood that in the cell string 200, the cell string 200 can include two cell pieces 10 connected in series, three cell pieces 10 connected in series or more cell pieces 10 connected in series, and the number of the cell pieces 10 connected in series can be determined according to actual use. In addition, in the embodiment of the present disclosure, the size and type of the cell piece 10 are not limited, and the specifications and sizes of the adjacent cell pieces 10 can be the same or different to meet different requirements.

[0062] It should be noted that the "first" and "second" in the first battery piece 101 and the second battery piece 102 are relative concepts, which means that the two battery pieces 10 are different. For example, in the example of FIG. 1, the battery piece 10 on the left is labeled as the first battery piece 101, and the battery piece 10 on the right is labeled as the second battery piece 102.

[0063] In the embodiments of the present disclosure, the specific arrangement of the adjacent battery pieces 10 is not limited, so as to meet different needs. For example, in an embodiment, two adjacent battery pieces 10 can be arranged at intervals. The interval of the two adjacent battery pieces 10 is in a suitable range, which can avoid small operation space and large welding difficulty caused by small interval, and can avoid waste of component space and increase of cost caused by large interval.

[0064] In the embodiments of the present disclosure, the doping type of the first doped layer and the second doped layer is not limited, for example, the first doped layer and the second doped layer can be a P-type doped layer and an N-type doped layer respectively; or the first doped layer can be an N-type doped layer, and the second doped layer can be a P-type doped layer, as long as the polarity of the two is opposite, so as to meet different needs.

[0065] In some embodiments, the first doped layer can be a P-type polysilicon layer, a P-type amorphous silicon layer, or a P-type microcrystalline silicon layer, which is not limited herein. Similarly, the second doped layer can be an N-type polysilicon layer, an N-type amorphous silicon layer, or an N-type microcrystalline silicon layer, which is not limited herein. When the first doped layer is a P-type doped layer and the second doped layer is an N-type doped layer, a P-type gate line can be further arranged on the first doped layer, and an N-type gate line can be further arranged on the second doped layer, which is not limited herein. In the present embodiment, the first solder strip 21 is connected to the first doped layer through the P-type gate line, and the second solder strip 22 is connected to the second doped layer through the N-type gate line.

[0066] In some embodiments, P-type doping refers to doping of group III elements, including elements such as boron, aluminum, gallium, indium, thallium, etc.; N-type doping refers to doping of group V elements, including elements such as nitrogen, phosphorus, arsenic, antimony, bismuth, etc., which is not limited herein.

[0067] In addition, in some embodiments, the first doped layer and the second doped layer can also be composite doping, for example, N-type doping also includes a small amount of P-type doping elements. The content of the N-type doping elements of the second doped layer is higher than 20% of the content of the P-type doping elements, so as to ensure that the polarity of the first doped layer is opposite to that of the second doped layer.

[0068] For example, the first fine grid 13 can be a positive electrode, and the second fine grid 14 can be a negative electrode. Of course, in other embodiments, they can be opposite, that is, the first fine grid 13 can be a negative electrode, and the second fine grid 14 can be a positive electrode, which is not limited herein.

[0069] In the solar cell module 100 of the embodiment of the present disclosure, the first direction and the third direction can be vertical directions, at this time, the cell sheet 10 can be rectangular, and the first direction and the third direction are also edge directions of the cell sheet 10, so as to maximize the area of the cell sheet 10.

[0070] Specifically, the included angle between the second direction and the fourth direction is an acute angle, by setting the first solder strip 21 to be inclined at an acute angle with the first fine grid 13, the contact area between the first solder strip 21 and the first fine grid 13 is significantly increased, thereby improving the electrical contact area between the first solder strip 21 and the first fine grid 13, and enhancing the conduction efficiency. At the same time, the inclined design of the first solder strip 21 and the first fine grid 13 can effectively alleviate the problem of stress concentration, ensure the stability of the connection between the first solder strip 21 and the first fine grid 13, and reduce the connection failure caused by mechanical stress or temperature change. The firm connection between the first solder strip 21 and the first fine grid 13 ensures the stable electrical connection between the cell sheets 10, and improves the reliability and service life of the solar cell module 100.

[0071] In the solar cell module 100 of the embodiment of the present disclosure, the first solder strip 21 is actively set to be inclined at an acute angle with the first fine grid 13, which can reduce the process difficulty of the solar cell module 100, reduce the alignment requirement in the welding process, improve the fault tolerance and precision of welding, and reduce the manufacturing complexity. The inclined setting mode is easier to operate by automatic equipment, improves the production efficiency, reduces manual intervention, and reduces the production cost. The acute-angled inclined design of the first solder strip 21 and the first fine grid 13 helps to disperse mechanical stress, reduce stress concentration at the welding points, and improve the reliability and durability of the welding points.

[0072] In addition, in the solar cell module 100 of the embodiment of the present disclosure, the first direction can be set perpendicular to the third direction, that is, a plurality of first solder strips 21 are arranged in parallel, and the number of first solder strips 21 is consistent with the number of first fine grids 13. The interval between different first solder strips 21 can be consistent with the interval between different first fine grids 13, so that each first solder strip 21 can cover the corresponding first fine grid 13, so that the first solder strip 21 and the first fine grid 13 almost coincide together, reducing the light shielding loss and improving the photoelectric conversion efficiency of the solar cell module 100.

[0073] It can be understood that in such an embodiment, the solar cell module 100 can further include a frame, a back plate, photovoltaic glass, and a glue film. The glue film can be filled between the first face 11 and the second face 12 of the cell sheet 10, the photovoltaic glass, the adjacent cell sheet 10, etc., as a filler, which can be a transparent glue with good light transmission performance and aging resistance, for example, the glue film can use EVA glue film or POE glue film, which can be selected according to actual conditions, and is not limited here.

[0074] The photovoltaic glass can be covered on the adhesive film of the first surface 11 of the cell sheet 10. The photovoltaic glass can be super white glass, which has high light transmittance, high transparency, and has superior physical, mechanical and optical properties. For example, the light transmittance of the super white glass can reach more than 92%, which can protect the cell sheet 10 as much as possible without affecting the efficiency of the cell sheet 10. At the same time, the adhesive film can bond the photovoltaic glass and the cell sheet 10 together, and the presence of the adhesive film can seal and insulate the cell sheet 10 and prevent water and moisture.

[0075] The back plate can be attached to the adhesive film of the second surface 12 of the cell sheet 10. The back plate can protect and support the cell sheet 10, has reliable insulation, water resistance and aging resistance. The back plate can have multiple choices, which can be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc. The specific setting can be made according to the specific situation, which is not limited here. The whole composed of the back plate, the cell sheet 10, the adhesive film and the photovoltaic glass can be set on the frame. The frame is the main external support structure of the whole solar cell module 100, and can stably support and install the solar cell module 100. For example, the solar cell module 100 can be installed at the required installation position through the frame.

[0076] Further, the spacing between adjacent first fine grids 13 and the spacing between adjacent second fine grids 14 can be flexibly adjusted according to actual needs. The first fine grid 13 and the second fine grid 14 can be set at equal intervals, which can ensure uniform distribution of current and improve the overall efficiency of the solar cell module 100. Non-equal interval setting can optimize the current conduction path for specific application scenarios and reduce the problem of local overheating or excessive resistance. The combination of part of the equal interval and part of the non-equal interval can combine the advantages of both and flexibly adjust according to specific needs to optimize the performance of the solar cell module 100.

[0077] Further, the first fine grid 13, the second fine grid 14, the first solder strip 21 and the second solder strip 22 are parallelly arranged. In this way, the cell sheet 10 body can be more regular, and multiple solder strips can be parallelly arranged on the cell sheet 10 and uniformly distributed along the third direction, ensuring that the spacing between the solder strips is uniform and forming a regular layout. Moreover, the solder strips can be arranged corresponding to the grid lines.

[0078] Embodiment two

[0079] Please refer to FIGS. 1-3. In some optional embodiments, the first solder strip 21 of the first surface 11 of the first cell sheet 101 and the second solder strip 22 of the second surface 12 of the adjacent second cell sheet 102 are an integral continuous structure.

[0080] Thus, the first solder strip 21 of the first surface 11 of the first cell sheet 101 and the second solder strip 22 of the second surface 12 of the adjacent second cell sheet 102 are in an integrated and continuous structure, which can ensure the electrical continuity of the battery string 200.

[0081] Specifically, the first solder strip 21 can extend in the same direction as the second solder strip 22 of the adjacent cell sheet 10, that is, the second solder strip 22 of the second surface 12 of the second cell sheet 102 extends in the same direction as the first solder strip 21 of the first cell sheet 101.

[0082] Embodiment Three

[0083] Referring to FIG. 3 and FIG. 5, in some alternative embodiments, the second fine grid 14 of the second cell sheet 102 extends in a fifth direction, and the second solder strip 22 extends in a sixth direction, and the second solder strip 22 is electrically connected to the second fine grid 14.

[0084] Thus, the second fine grid 14 of the second cell sheet 102 extends in the fifth direction and can be arranged at intervals along the third direction; the second solder strip 22 extends in the sixth direction and can be arranged at intervals along the third direction. The second solder strip 22 is electrically connected to the second fine grid 14, so that the second fine grid 14 can conduct the current of the second doped layer to the second solder strip 22.

[0085] In the embodiments of the present disclosure, the fifth direction and the sixth direction are not limited to meet different needs. For example, the fifth direction can be perpendicular to the sixth direction, and the sixth direction can be consistent with the fourth direction, so that each first solder strip 21 can be arranged corresponding to the second solder strip 22 of the adjacent cell sheet 10, to ensure the stable connection of the first solder strip 21 and the second solder strip 22. Of course, the fifth direction can also be consistent with the third direction.

[0086] Embodiment Four

[0087] Referring to FIG. 5 and FIG. 6, in some alternative embodiments, the included angle β between the fifth direction and the sixth direction is an acute angle.

[0088] Thus, the second solder strip 22 and the second fine grid 14 are arranged approximately in parallel, each second fine grid 14 corresponds to a second solder strip 22, and the second solder strip 22 can be arranged on the second fine grid 14.

[0089] Embodiment Five

[0090] Referring to FIG. 7, in some alternative embodiments, the second surface 12 of the second cell sheet 102 is provided with a plurality of main grids 15, and the second solder strip 22 of the second surface 12 of the second cell sheet 102 is electrically connected to the main grid 15.

[0091] Thus, the second fine grid 14 can be arranged to cross the main grid 15, and the second solder strip 22 can be electrically connected together with the main grid 15. At this time, the second fine grid 14 and the second solder strip 22 can be arranged in parallel or at an acute angle.

[0092] Embodiment six

[0093] Referring to FIGS. 5 and 6, in some alternative embodiments, the first solder strip 21 of the first surface 11 of the first cell 101 and the second solder strip 22 of the second surface 12 of the adjacent second cell 102 are not integrally continuous structures, and the first solder strip 21 and the second solder strip 22 are electrically connected by the busbar 30.

[0094] Thus, the first solder strip 21 of the first surface 11 of the first cell 101 and the second solder strip 22 of the second surface 12 of the adjacent second cell 102 are disconnected, and can be connected together by the busbar 30 or other directions.

[0095] Specifically, in the process of preparing the cell string 200, the first solder strip 21 can cover the first fine grid 13 of a plurality of cells 10 on the same straight line in the fourth direction at one time, and the second solder strip 22 can cover the second fine grid 14 of a plurality of cells 10 on the same straight line in the sixth direction at one time, then the first solder strip 21 and the second solder strip 22 between adjacent cells 10 are cut off, and finally the first solder strip 21 of the first cell 101 and the second solder strip 22 of the second cell 102 are electrically connected together. In this way, the efficiency of soldering can be improved, the soldering steps and time can be reduced, and large-scale production is suitable. The design of the solder strip attached to the grid line at a certain angle facilitates the operation of the automatic equipment, improves the production precision and consistency. The connection of the solder strip and the grid line increases the mechanical strength and stability of the solar cell module 100, prolongs the service life.

[0096] Illustratively, in the process of preparing, one solder strip can be arranged on the grid lines of a plurality of cells 10 on the same straight line at the same time, and then can be disconnected at a predetermined position to ensure that the solder strip can connect the first fine grid 13 and the second fine grid 14 of adjacent cells 10. The first solder strip 21 and the second solder strip 22 respectively extend out of the cell 10, and then are electrically connected in the gap between the first cell 101 and the second cell 102 or on the second surface 12 of the second cell 102.

[0097] Embodiment seven

[0098] Referring to FIGS. 5 and 6, in some alternative embodiments, the busbar 30 connecting the first solder strip 21 of the first cell 101 and the second solder strip 22 of the adjacent second cell 102 is located between the first cell 101 and the second cell 102.

[0099] In this way, the busbar 30 is located between the first cell sheet 101 and the second cell sheet 102, which facilitates the preparation of the battery string 200 and simplifies the preparation process.

[0100] Embodiment Eight

[0101] Referring to FIGS. 8-12, in some alternative embodiments, the busbar 30 connecting the first busbar 21 of the first cell sheet 101 and the second busbar 22 of the adjacent second cell sheet 102 is located on the second surface 12 of the second cell sheet 102.

[0102] In this way, the space occupied by the busbar 30 for the solar cell module 100 can be reduced, the gap between adjacent cell sheets 10 can be reduced, and the light receiving area of the solar cell module 100 can be increased.

[0103] Embodiment Nine

[0104] Referring to FIGS. 8 and 12, in some alternative embodiments, the first busbar 21 of the first cell sheet 101 and the second busbar 22 of the second cell sheet 102 are connected on the same surface or opposite surfaces of the busbar 30.

[0105] In the embodiments of the present disclosure, the first busbar 21 and the second busbar 22 are not limited to be connected on opposite positions of the busbar 30 to meet different requirements. In one example, the first busbar 21 of the first cell sheet 101 and the second busbar 22 of the second cell sheet 102 are connected on the same surface of the busbar 30, in which case, the first busbar 21 and the second busbar 22 are both arranged on the side of the busbar 30 away from the first surface 11, or the first busbar 21 and the second busbar 22 are both arranged on the side of the busbar 30 close to the first surface 11. In one example, the first busbar 21 of the first cell sheet 101 and the second busbar 22 of the second cell sheet 102 are connected on opposite surfaces of the busbar 30, in which case, the first busbar 21 is arranged on the side of the busbar 30 away from the first surface 11, and the second busbar 22 is arranged on the side of the busbar 30 close to the first surface 11; or the first busbar 21 is arranged on the side of the busbar 30 close to the first surface 11, and the second busbar 22 is arranged on the side of the busbar 30 away from the first surface 11.

[0106] Embodiment Ten

[0107] Referring to FIGS. 5, 6, 8, 9, 10, and 12, in some alternative embodiments, the first busbar 21 of the first cell sheet 101 and the second busbar 22 of the second cell sheet 102 are electrically connected to the busbar 30 through conductive glue or solder points.

[0108] In this way, the conductive glue or solder points can ensure stable connection of the busbar to the busbar 30.

[0109] Embodiment Eleven

[0110] Referring to FIG. 1 and FIG. 2, in some optional embodiments, the first solder strip 21 is a flat solder strip or a round solder strip or a triangular solder strip, and the second solder strip 22 is a flat solder strip or a round solder strip or a triangular solder strip.

[0111] In the embodiments of the present disclosure, the specific forms of the first solder strip 21 and the second solder strip 22 are not limited to meet different needs. Preferably, the first solder strip 21 and the second solder strip 22 can be round solder strips or triangular solder strips to reduce the light blocking and improve the bifaciality of the solar cell module 100.

[0112] Embodiment Twelve

[0113] Referring to FIG. 1 and FIG. 2, in some optional embodiments, the width of the round solder strip along the third direction is 0.05mm-0.3mm. For example, the width of the round solder strip along the third direction can be one of 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm.

[0114] Embodiment Thirteen

[0115] Referring to FIG. 1 and FIG. 2, in some optional embodiments, the width of the flat solder strip along the third direction is 0.2mm-0.6mm. For example, the width of the flat solder strip along the third direction can be one of 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm.

[0116] Embodiment Fourteen

[0117] Referring to FIG. 1 and FIG. 2, in some optional embodiments, the width of the base of the triangular solder strip along the third direction is 0.05mm-0.3mm. For example, the width of the base of the triangular solder strip along the third direction can be one of 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm.

[0118] Specifically, the width of the solder strip along the third direction is set in this range, which can not only ensure the stable connection of the solder strip and the fine grid, but also avoid the blocking of light and improve the bifaciality of the solar cell module 100.

[0119] Embodiment Fifteen

[0120] Referring to FIG. 1 and FIG. 2, in some optional embodiments, the included angle α between the second direction and the fourth direction satisfies the following relationship: 0

[0121] Wherein, L is the total length of the first cell tab 10 and the last cell tab 10 in the cell string 200 along the first direction, and D is the width of the cell tab 10 along the third direction.

[0122] Thus, the inclination angle of the first solder strip 21 can be derived according to the length of the battery string 200, and the angle can be adjusted for different lengths and different types of battery string 200, so that one first solder strip 21 can completely cover the doped layer on the same straight line of the plurality of battery pieces 10. In this way, the process can be facilitated, and after the first solder strip 21 is connected in series with the plurality of battery pieces 10, laser is used to selectively cut to form the battery string 200 in pairs.

[0123] Specifically, according to the length of the battery string 200 and the width of the grid line, the inclination angle of the first solder strip 21 is flexibly adjusted to adapt to the specific needs of different battery strings 200, and to ensure that the first solder strip 21 can completely cover the first fine grid 13. D is the width of the battery piece 10 along the third direction, that is, the first face 11 of the first battery piece 101 can be provided with only one first fine grid 13, and the first fine grid 13 and the first solder strip 21 are both arranged along the diagonal direction of the first battery piece 101. Obviously, this is an extreme setting, and in other embodiments, there can be other settings. Of course, the second solder strip 22 and the second fine grid 14 can also have similar arrangements, which are not limited here.

[0124] Specifically, one solder strip can completely cover the doped layer of the plurality of battery pieces 10 on the process line, simplifying the soldering process, reducing the soldering steps, and improving the production efficiency. After the solder strip is connected in series with the plurality of battery pieces 10, laser is used to selectively cut to form the battery string 200 in pairs, which is efficient and accurate, and reduces the complexity in the production process.

[0125] For example, the battery string 200 can be uniformly distributed along the first direction by 9 battery pieces 10, and L is the distance between the farthest ends of the 9 battery pieces 10. According to the length and the width D of the battery piece 10 along the third direction, the inclination angle a is calculated so that the solder strip can be arranged at an angle of a.

[0126] In the embodiments of the present disclosure, the range of the included angle a between the second direction and the fourth direction is not limited to meet different needs. In this way, the length of the battery string 200 and the number of fine grids can be adjusted.

[0127] Embodiment sixteen

[0128] Please refer to FIG. 1 and FIG. 2, in some optional embodiments, the included angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 50L.

[0129] Thus, 50 first fine grids 13 can be arranged on the first surface 11, the 50 first fine grids 13 being arranged at equal intervals to divide the width of the battery piece 10 along the third direction, and each first solder strip 21 corresponds to one first fine grid 13, and at this time, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 50L.

[0130] Embodiment seventeen

[0131] Referring to FIGS. 1 and 2, in some alternative embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 100L.

[0132] Thus, 100 first fine grids 13 can be arranged on the first surface 11, the 100 first fine grids 13 being arranged at equal intervals to divide the width of the battery piece 10 along the third direction, and each first solder strip 21 corresponds to one first fine grid 13, and at this time, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 100L.

[0133] Embodiment eighteen

[0134] Referring to FIGS. 1 and 2, in some alternative embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 150L.

[0135] Thus, 150 first fine grids 13 can be arranged on the first surface 11, the 150 first fine grids 13 being arranged at equal intervals to divide the width of the battery piece 10 along the third direction, and each first solder strip 21 corresponds to one first fine grid 13, and at this time, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 150L.

[0136] Embodiment nineteen

[0137] Referring to FIGS. 1 and 2, in some alternative embodiments, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 250L.

[0138] Thus, 250 first fine grids 13 can be arranged on the first surface 11, the 250 first fine grids 13 being arranged at equal intervals to divide the width of the battery piece 10 along the third direction, and each first solder strip 21 corresponds to one first fine grid 13, and at this time, the angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 250L.

[0139] Embodiment twenty

[0140] Referring to FIGS. 5 and 6, in some alternative embodiments, the angle b between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan b < D / L.

[0141] wherein L is the total length of the battery string 200 in the first direction from the first cell tab 10 to the farthest end of the last cell tab 10, and D is the width of the cell tab 10 in the third direction.

[0142] In this way, the angle of the second solder strip 22 can be determined according to the length of the battery string 200, and the angle can be adjusted for different lengths and different types of battery string 200, so that one second solder strip 22 can completely cover the doped layer on the same straight line of multiple cell tabs 10. In this way, the process can be facilitated, and after the second solder strip 22 is connected in series with multiple cell tabs 10, laser is used to selectively cut to form a pair of battery string 200.

[0143] Embodiment twenty-one

[0144] Referring to FIGS. 5 and 6, in some optional embodiments, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 50L.

[0145] In this way, 50 second fine grids 14 can be arranged on the second surface 12, and the 50 second fine grids 14 are arranged at equal intervals to divide the width of the cell tab 10 in the third direction, and each second solder strip 22 corresponds to one second fine grid 14. At this time, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 50L.

[0146] Embodiment twenty-two

[0147] Referring to FIGS. 5 and 6, in some optional embodiments, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 100L.

[0148] In this way, 100 second fine grids 14 can be arranged on the second surface 12, and the 100 second fine grids 14 are arranged at equal intervals to divide the width of the cell tab 10 in the third direction, and each second solder strip 22 corresponds to one second fine grid 14. At this time, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 100L.

[0149] Embodiment twenty-three

[0150] Referring to FIGS. 5 and 6, in some optional embodiments, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 150L.

[0151] Thus, 150 second thin grids 14 can be arranged on the second surface 12, and the 150 second thin grids 14 are arranged at equal intervals to divide the width of the cell sheet 10 along the third direction, and each second solder strip 22 corresponds to one second thin grid 14. At this time, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 150L.

[0152] Embodiment twenty-four

[0153] Please refer to FIG. 5 and FIG. 6, in some alternative embodiments, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 250L.

[0154] Thus, 250 second thin grids 14 can be arranged on the second surface 12, and the 250 second thin grids 14 are arranged at equal intervals to divide the width of the cell sheet 10 along the third direction, and each second solder strip 22 corresponds to one second thin grid 14. At this time, the angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 250L.

[0155] Embodiment twenty-five

[0156] Please refer to FIG. 1 and FIG. 13, the photovoltaic system 300 provided by the embodiments of the present disclosure includes the solar cell module 100 of any one of the above embodiments.

[0157] In the solar cell module 100 and the photovoltaic system 300 of the embodiments of the present disclosure, the cell string 200 includes a plurality of cell sheets 10, the plurality of cell sheets 10 are arranged along the first direction, the cell sheet 10 includes the first surface 11 and the second surface 12 opposite to each other, the plurality of cell sheets 10 include the first cell sheet 101 and the second cell sheet 102 arranged adjacent to each other; a plurality of first thin grids 13 arranged on the first surface 11 of the cell sheet 10 and a plurality of second thin grids 14 arranged on the second surface 12 of the cell sheet 10, the first thin grids 13 extend along the second direction, and the first thin grids 13 are arranged at intervals along the third direction; a plurality of first solder strips 21 arranged on the first surface 11 of the cell sheet 10 and a plurality of second solder strips 22 arranged on the second surface 12 of the cell sheet 10, the first solder strips 21 extend along the fourth direction and are arranged at intervals along the third direction, the first solder strips 21 are electrically connected with the first thin grids 13, and the first solder strips 21 of the first cell sheet 101 and the second solder strips 22 of the second cell sheet 102 are directly or indirectly electrically connected; and the angle α between the second direction and the fourth direction is an acute angle. Thus, the solder strip and the thin grid can be arranged at an acute angle to increase the contact area of the solder strip and the thin grid, thereby reducing the resistance and improving the conduction efficiency. At the same time, the solder strip and the grid line almost coincide together, reducing the light blocking loss and improving the photoelectric conversion efficiency of the solar cell module 100.

[0158] In the present embodiment, the photovoltaic system 300 can be applied in a photovoltaic power station, such as a ground power station, a roof power station, a water surface power station, etc., and can also be applied in a device or apparatus that utilizes solar energy to generate power, such as a user solar power source, a solar street lamp, a solar car, a solar building, etc. Of course, it can be understood that the application scenarios of the photovoltaic system 300 are not limited to this, that is, the photovoltaic system 300 can be applied in all fields that need to utilize solar energy to generate power. Taking a photovoltaic power generation system network as an example, the photovoltaic system 300 can include a photovoltaic array, a combiner box, and an inverter, the photovoltaic array can be an array combination of a plurality of solar cell modules 100, for example, a plurality of solar cell modules 100 can form a plurality of photovoltaic arrays, the photovoltaic arrays are connected to the combiner box, the combiner box can combine the current generated by the photovoltaic arrays, the combined current flows through the inverter to convert into alternating current required by a power grid, and then is connected to a power network to realize solar power supply.

[0159] In the description of the present specification, the description referring to the terms "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0160] In addition, the above are only the preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modification, equivalent replacement and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A solar cell module, comprising a cell string, the cell string comprising a plurality of cell pieces, the plurality of cell pieces being arranged in a first direction, the cell pieces comprising a first surface and a second surface opposite to each other, the plurality of cell pieces comprising a first cell piece and a second cell piece arranged adjacently; a plurality of first busbars arranged on the first surface of the cell pieces, a plurality of second busbars arranged on the second surface of the cell pieces, the first busbars extending in a second direction, the first busbars being arranged in a third direction at intervals; a plurality of first solder strips arranged on the first surface of the cell pieces, a plurality of second solder strips arranged on the second surface of the cell pieces, the first solder strips extending in a fourth direction and being arranged in the third direction at intervals, the first solder strips being electrically connected to the first busbars, the first solder strips of the first cell piece and the second solder strips of the second cell piece being directly or indirectly electrically connected. wherein An angle α between the second direction and the fourth direction is an acute angle.

2. The solar cell module according to claim 1, wherein The first solder strips of the first surface of the first cell piece and the second solder strips of the second surface of the adjacent second cell piece are an integral continuous structure.

3. The solar cell module according to claim 2, wherein The second busbars of the second cell piece extend in a fifth direction, the second solder strips extend in a sixth direction, and the second solder strips are electrically connected to the second busbars crosswise.

4. The solar cell module according to claim 3, wherein An angle β between the fifth direction and the sixth direction is an acute angle.

5. The solar cell module according to claim 2, wherein The second surface of the second cell piece is provided with a plurality of main busbars, and the second solder strips of the second surface of the second cell piece are electrically connected to the main busbars crosswise.

6. The solar cell module according to claim 1, wherein The first solder strips of the first surface of the first cell piece and the second solder strips of the second surface of the adjacent second cell piece are a non-integral continuous structure, and the first solder strips and the second solder strips are electrically connected through a busbar.

7. The solar cell module according to claim 6, wherein The busbar connecting the first solder strips of the first cell piece and the second solder strips of the adjacent second cell piece is located between the first cell piece and the second cell piece.

8. The solar cell module according to claim 6, wherein The busbar connecting the first solder strips of the first cell piece and the second solder strips of the adjacent second cell piece is located on the second surface of the second cell piece.

9. The solar cell module according to claim 6, wherein, The first solder strips of the first cell piece and the second solder strips of the second cell piece are connected on the same surface or opposite surfaces of the busbar.

10. The solar cell module according to claim 6, wherein The first solder strips of the first cell piece and the second solder strips of the second cell piece are electrically connected to the busbar through conductive glue or solder joints.

11. The solar cell module according to claim 1, wherein The first solder strips are flat solder strips or round solder strips or triangular solder strips, and the second solder strips are flat solder strips or round solder strips or triangular solder strips.

12. The solar cell module according to claim 11, wherein, The width of the round solder strips in the third direction is 0.05mm-0.3mm.

13. The solar cell module according to claim 11, wherein, The width of the flat solder strips in the third direction is 0.2mm-0.6mm.

14. The solar cell module according to claim 11, wherein, The width of the base of the triangular solder strips in the third direction is 0.05mm-0.3mm.

15. The solar cell module according to claim 1, wherein, The angle α between the second direction and the fourth direction satisfies the following relationship: 0 wherein L is the total length of the most distant ends of the first cell piece and the last cell piece in the cell string in the first direction, and D is the width of the cell piece in the third direction.

16. The solar cell module according to claim 15, wherein, An angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 50L.

17. The solar cell module according to claim 15, wherein, An angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 100L.

18. The solar cell module according to claim 15, wherein, An angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 150L.

19. The solar cell module according to claim 15, wherein, An angle a between the second direction and the fourth direction satisfies the following relationship: 0 < tan a < D / 250L.

20. The solar cell module according to claim 4, wherein, An angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / L. wherein L is a total length of the battery string from a first one of the battery pieces to a last one of the battery pieces along the first direction, and D is a width of the battery piece along the third direction.

21. The solar cell module according to claim 20, wherein, An angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 50L.

22. The solar cell module according to claim 20, wherein, An angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 100L.

23. The solar cell module according to claim 20, wherein, An angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 150L.

24. The solar cell module according to claim 20, wherein, An angle β between the fifth direction and the sixth direction satisfies the following relationship: 0 < tan β < D / 250L.

25. A photovoltaic system comprising the solar cell module of any one of claims 1-24.

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