Solar cell

Abstract

The application is suitable for the technical field of solar cells, and provides a solar cell, which comprises a cell body, a plurality of split parts and a plurality of cutting parts, the cutting part is located between two adjacent split parts, the cutting part is provided with an identification mark in a corresponding area, and the identification mark is used for corresponding cell information of the solar cell. In this way, the appearance and the cell efficiency of the solar cell can be improved.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and in particular relates to a solar cell. Background Technology

[0002] In related technologies, a protective layer is printed on the front side of solar cells. Due to the obstruction of this protective layer, it is difficult to inspect the color and appearance of the solar cells after the protective layer has been printed. Therefore, the color of the solar cells is usually inspected before the protective layer is formed, and before final sorting, cell information such as color and appearance is formed on the protective adhesive using QR codes or other markings.

[0003] However, this results in QR codes and other markings being visible on the solar cells, leading to a poor appearance. Furthermore, these markings can negatively impact light reception, resulting in lower cell efficiency. Summary of the Invention

[0004] This application provides a solar cell aimed at solving the problems of poor appearance and low efficiency of solar cells.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, a solar cell is provided, comprising: a cell body; including a plurality of slab sections and a plurality of cut sections; the cut sections are located between two adjacent slab sections; an identification mark is provided in the corresponding area of ​​the cut section; the identification mark is used to correspond to the cell information of the solar cell.

[0006] In some embodiments, an identification mark is disposed on the passivation layer of the corresponding area of ​​the cut portion, and the identification mark is a through hole on the passivation layer.

[0007] In some embodiments, the passivation layer of the area corresponding to the cutting portion is the passivation layer of the area corresponding to the back side of the cutting portion, or the passivation layer of the area corresponding to the cutting portion is the passivation layer of the area corresponding to the front side of the cutting portion.

[0008] In some embodiments, the size of the identification mark is 10µm to 500µm along the width direction of the cut portion.

[0009] In some embodiments, the arrangement of the identification marks includes any of the following: arranged along the width direction of the cut portion, arranged along the length direction of the cut portion, or arranged in a dot matrix manner.

[0010] In some embodiments, the via extends into the silicon substrate to form a recess, the depth of which is 2nm to 35nm.

[0011] In some embodiments, the spacing between two adjacent identification marks is 30mm to 90mm.

[0012] In some embodiments, the identification identifier is one or more of Morse code, triangle, circle, ellipse, quadrilateral, number, and letter.

[0013] In some embodiments, the width of the cut portion is 0.5 mm to 3 mm.

[0014] In some embodiments, the number of segments is 2 to 6.

[0015] In some embodiments, when the number of segments is 3 to 6, the identification marks are distributed in one or more areas corresponding to the cutting segments.

[0016] In some embodiments, a protective layer is also included; the protective layer is disposed on the front side of the battery body, at least on the front side of the segmented portion in the battery body, and the protective layer is located outside the identification mark.

[0017] In some embodiments, the battery information includes one or more of the following: cell grade, cell conversion efficiency, cell light-receiving film color, cell manufacturing time, cell manufacturing equipment, cell Isc-Voc information, cell Electroluminescence Test information, and cell Photoluminescence information.

[0018] The beneficial effects of this invention are as follows: The solar cell, photovoltaic module, and photovoltaic system of this application embodiment have several slab sections and several cutting sections. The cutting sections are located between two adjacent slab sections, that is, after being cut by the cutting section, each slab section corresponds to one cell slab. The area corresponding to the cutting section is provided with an identification mark. The identification mark is used to correspond to the cell information of the solar cell. In this way, there are no QR codes or other markings on the front of the solar cell, and the area corresponding to the cutting section is small, which can improve the appearance of the solar cell. Moreover, the area corresponding to the cutting section does not affect the light-receiving effect of the solar cell, which can improve the cell efficiency of the solar cell. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a solar cell provided in an embodiment of this application; Figure 2 This is a schematic PL image of a solar cell provided in an embodiment of this application; Figure 3 This is a schematic diagram showing the distribution of identification marks on a solar cell provided in an embodiment of this application; Figure 4 This is a schematic diagram showing the distribution of identification marks on a solar cell according to another embodiment of this application; Figure 5 This is a schematic diagram showing the distribution of identification marks on a solar cell according to another embodiment of this application; Figure 6 This is a schematic diagram showing the distribution of identification marks on a solar cell according to another embodiment of this application.

[0020] Explanation of key component symbols: Battery body 10; Segmentation section 11; Cutting section 12; Identification mark 13; Silicon substrate 14; Doped layer 15; Passivation layer 16; Metal layer 17; Tunneling layer 18. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] According to one aspect of this application, a solar cell is provided, such as... Figures 1-2 As shown, it includes: a battery body 10, which includes a plurality of segmented portions 11 and a plurality of cutting portions 12; the cutting portions 12 are located between two adjacent segmented portions 11; The area corresponding to the cutting section 12 is provided with an identification mark 13; the identification mark 13 is used to provide the battery information of the corresponding solar cell.

[0028] The solar cell, photovoltaic module, and photovoltaic system of this application embodiment have several slab sections 11 and several cutting sections 12. The cutting sections 12 are located between two adjacent slab sections 11. That is, after being cut by the cutting section 12, each slab section 11 corresponds to one cell slab. The area corresponding to the cutting section 12 is provided with an identification mark 13. The identification mark 13 is used to correspond to the cell information of the solar cell. In this way, there are no QR codes or other markings on the front of the solar cell, and the area corresponding to the cutting section is small, which can improve the appearance of the solar cell. Moreover, the area corresponding to the cutting section 12 does not affect the light-receiving effect of the solar cell, which can improve the cell efficiency of the solar cell.

[0029] The solar cell is a whole, uncut cell, which can be cut along the cutting section 12. The whole solar cell can be asymmetrical or symmetrical along the cutting section 12.

[0030] In the case of multiple cutting sections 12, an identification mark 13 may be provided in the corresponding area on the back of one of the multiple cutting sections 12; or an identification mark 13 may be provided in the corresponding area on the back of each of the multiple cutting sections 12, without limitation.

[0031] In one embodiment of the present invention, the number of segmented portions 11 is 2 to 6. Cutting portions 12 are provided at the bisectors of the battery body 10, for example, at bisecting, trisecting, quadrisecting, quincunx, or septucting lines. When the cutting portion 12 is provided at a bisecting line, there are 2 segmented portions 11 and 1 cutting portion 12; when the cutting portion 12 is provided at a trisecting line, there are 3 segmented portions 11 and 2 cutting portions 12; when the cutting portion 12 is provided at a quadrisecting line, there are 4 segmented portions 11 and 3 cutting portions 12; when the cutting portion 12 is provided at a quincunxting line, there are 5 segmented portions 11 and 4 cutting portions 12; and when the cutting portion 12 is provided at a septucting line, there are 6 segmented portions 11 and 5 cutting portions 12.

[0032] In this way, the battery operating current is halved after segmentation, which can reduce internal resistance loss, improve battery power, and local shadows or defects only affect a single segment, limiting the range of heat generation and power loss, avoiding the failure of the entire battery, and making it safer.

[0033] The battery information includes one or more of the following: cell grade, cell conversion efficiency, cell light-receiving film color, cell manufacturing time, cell manufacturing equipment, cell current-voltage (Isc-Voc, IV) information, cell electroluminescence (EL) test information, and cell photoluminescence (PL) information.

[0034] In one embodiment of the present invention, the battery body 10 includes a silicon substrate 14, a doped layer 15, and a passivation layer 16. The doped layer 15 is disposed on the back side of the silicon substrate 14; The passivation layer is disposed on the side of the doped layer 15 away from the silicon substrate 14.

[0035] In one embodiment of the present invention, the identification mark 13 is disposed on the passivation layer 16 in the area corresponding to the cutting portion 12.

[0036] Specifically, the identification mark 13 can be located at the center of the passivation layer 16 in the area corresponding to the cutting part 12, or at the edge of the passivation layer 16 in the area corresponding to the cutting part 12, and there is no limitation on this.

[0037] Understandably, the identification mark 13 is set on the passivation layer 16 in the corresponding area of ​​the cutting section 12. Subsequently, during the cell film color sorting, the passivation layer 16 in the corresponding area of ​​the identification mark 13 has a light-emitting characteristic that forms an identifiable difference in brightness with the surrounding area, which can be clearly captured by PL detection equipment or EL detection equipment, thereby improving the efficiency of cell film color sorting.

[0038] In one embodiment of the present invention, the passivation layer 16 corresponding to the cutting portion 12 is the passivation layer 16 corresponding to the back surface of the cutting portion 12.

[0039] In practical applications, identification marks 13 can be formed on the passivation layer 16 in the corresponding area on the back of the cut part 12 by laser marking.

[0040] Thus, by using a laser to set the identification mark 13 on the back of the solar cell, the battery information can be marked on the corresponding solar cell without adding any processing steps. Furthermore, since the laser slicing process inherently introduces a cut surface without the protection of the passivation layer 16, and the cut position coincides precisely with the identification mark 13, no additional power loss is introduced. In addition, the absence of QR codes or other markings on the front of the solar cell improves its appearance, and the corresponding area on the back of the cut portion 12 does not affect the solar cell's light-receiving effect, thereby improving the cell efficiency.

[0041] In one embodiment of the present invention, the passivation layer 16 corresponding to the cutting portion 12 is the passivation layer 16 corresponding to the front side of the cutting portion 12.

[0042] In this way, the solar cell has no QR code or other markings on the front, and the area corresponding to the cut part 12 is small, which can improve the appearance of the solar cell. In addition, the area corresponding to the cut part 12 will not affect the light-receiving effect of the solar cell, which can improve the cell efficiency of the solar cell.

[0043] In one embodiment of the present invention, the identification mark 13 is a through hole on the passivation layer 16.

[0044] That is, the thickness of the passivation layer 16 at the identification mark 13 is 0. When the identification mark 13 is a through hole on the passivation layer 16, the through hole can be formed by laser irradiation.

[0045] In some embodiments, the via extends into the silicon substrate to form a recess, the depth of which is 2nm to 35nm.

[0046] In practical applications, during laser irradiation, the surface of the silicon substrate beneath the identification mark 13 is partially removed by the laser, forming a pit with a depth of 2nm to 35nm. For example, it can be any value between 2nm, 10nm, 20nm, 30nm, 35nm, or 2nm to 35nm, without limitation. This appropriate pit depth ensures a difference in brightness between the area of ​​the identification mark 13 and other areas under the detection equipment, thereby guaranteeing the effective identification of the identification mark 13.

[0047] Understandably, the identification mark 13 is a through-hole on the passivation layer 16. This allows the area of ​​the identification mark 13 to appear as a black dot under the detection device, while the other areas emit light normally. This creates a clear difference in brightness between the area of ​​the identification mark 13 and other areas under the detection device, thereby ensuring the identification effect of the identification mark 13.

[0048] In one embodiment of the present invention, the size of the identification mark 13 along the width direction of the cut portion 12 is 10um to 500um. For example, it can be any value between 10um, 100um, 200um, 300um, 400um, 500um or 10um to 500um, and is not limited herein.

[0049] Thus, the size of the identification mark 13 is within a suitable range along the width direction of the cutting portion 12. This can prevent the identification mark 13 from being too small, which would make the manufacturing process and identification more difficult; it can also prevent the identification mark 13 from being too large, which would exceed the range of the cutting portion 12 and affect the battery efficiency.

[0050] In one embodiment of the present invention, the arrangement of the identification mark 13 includes any of the following: arranged along the width direction of the cut portion 12, arranged along the length direction of the cut portion 12, or arranged in a dot matrix manner.

[0051] It should be noted that the identification marks 13 can be arranged at equal intervals or at non-equal intervals, and there is no restriction here.

[0052] In one embodiment of the present invention, the identification marks 13 are arranged at equal intervals, with the distance between two adjacent identification marks 13 being 30 mm to 90 mm. For example, it can be any value between 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, or 30 mm to 90 mm, and is not limited herein. In this way, the distance between two adjacent identification marks 13 is within a suitable range, which can avoid identification errors caused by the distance between the two identification marks 13 being too small, and can also avoid the distance between the two identification marks 13 being too large, causing them to exceed the range of the cutting part 12 and affecting battery efficiency.

[0053] In a preferred embodiment, the identification mark 13 corresponds to the battery information of the light-receiving film color of the battery cell, and there are 5 identification marks 13, representing 5 different film colors. For example... Figure 3 As shown, the size of the identification mark 13 is 10um to 100um along the width direction of the cutting part 12, and the identification mark 13 is arranged along the width direction of the cutting part 12.

[0054] In a preferred embodiment, the identification mark 13 corresponds to the battery information of the light-receiving film color of the battery cell, and there are 8 identification marks 13, representing 8 different film colors. For example... Figure 4 As shown, the size of the identification mark 13 is 100um to 500um along the width direction of the cutting part 12, and the identification mark 13 is arranged along the length direction of the cutting part 12.

[0055] In a preferred embodiment, the identification mark 13 corresponds to the battery information of the light-receiving film color of the battery cell, and there are 8 identification marks 13, representing 8 different film colors. For example... Figure 5 As shown, along the width direction of the cut section 12, the size of the identification mark 13 is 100um to 500um, and the identification marks 13 are arranged in a dot matrix pattern. Of course, the number of identification marks 13 in each row and the number of identification marks 13 in each column of the dot matrix arrangement can be set to other methods as needed. Figure 5 The dot matrix arrangement shown is merely an illustrative example and is not intended to be limiting.

[0056] In one embodiment of the present invention, when the number of segmented portions 11 is 3 to 6, the identification mark 13 is distributed in the corresponding area of ​​one or more cutting portions 12.

[0057] Specifically, when the number of slab sections 11 is 3 to 6, the number of cutting sections 12 is multiple. The identification mark 13 can be set in any one of the multiple cutting sections 12, or in any two, any three, etc., of the multiple cutting sections 12, or the identification mark 13 can be set in each of the multiple cutting sections 12. In this way, the distance between the identification marks 13 can be more dispersed, further improving the appearance of the solar cell.

[0058] In a preferred embodiment, the identification mark 13 corresponds to the battery information of the light-receiving film color of the battery cell, and there are 8 identification marks 13, representing 8 different film colors. For example... Figure 6 As shown, there are 3 slicing sections 11 and 2 cutting sections 12. Each cutting section 12 can have 4 identification marks 13. Of course, the number of identification marks 13 on each cutting section 12 and the arrangement of the identification marks 13 on each cutting section 12 can be set to other methods as needed. Figure 6The number of identification marks 13 on each cut section 12 shown, and the arrangement of the identification marks 13 on each cut section 12, are merely illustrative examples and are not intended to limit the scope of the invention.

[0059] In this embodiment, the silicon substrate 14 is an N-type monocrystalline silicon wafer. It is understood that in other embodiments, the silicon substrate 14 may also be other types of silicon wafers such as polycrystalline silicon wafers or quasi-monocrystalline silicon wafers. The type of the silicon substrate 14 may also be set to P-type. The silicon substrate 14 is set according to the actual use needs, and no specific limitation is made here.

[0060] The doped layer 15 can be formed by diffusion into the silicon substrate 14 or by deposition of a film on the silicon substrate 14 through methods such as ion implantation; there is no limitation on this. For example, the silicon substrate 1411 can be placed in a deposition apparatus, and silane gas can be introduced into the deposition apparatus to deposit polycrystalline silicon on the silicon substrate 14, and then doped in the polycrystalline silicon to form the doped layer 15.

[0061] In one embodiment of the present invention, the passivation layer 16 is one or more combinations of an oxide layer, a silicon carbide layer, and an amorphous silicon layer. As examples of the present invention, the passivation layer 16 can be an oxide layer of a single material, a combination of oxide layers of multiple materials and amorphous silicon layers, or a combination of multiple layers of amorphous silicon with different refractive indices of a single material. Furthermore, the passivation layer 16 can also be a silicon oxynitride layer, a silicon nitride layer, etc. It is understood that the specific structural arrangement of the passivation layer 16 includes, but is not limited to, the several arrangements listed above. The passivation layer 16 is configured according to actual usage needs and is not specifically limited here.

[0062] In practical applications, the passivation layer 16 can be prepared by methods such as atomic layer deposition, and no specific limitation is made here.

[0063] It should be noted that the solar cell provided in the embodiments of this application is a back-contact solar cell.

[0064] In some embodiments, the identification identifier 13 is one or more of Morse code, triangle, circle, ellipse, quadrilateral, number, and letter.

[0065] Specifically, when identifier 13 is Morse code, the Morse code includes a short dot signal " The combination of point signals and long signals ("—") can represent different battery information.

[0066] Alternatively, battery information can be represented by the number of identification marks 13. Taking the battery information as film color information and the identification mark 13 as a small dot as an example, one small dot "·" indicates that the film color is Class 1, two small dots "··" indicate Class 2, and so on. They will not be listed one by one here.

[0067] In some embodiments, the width of the cutting portion 12 is 0.5mm to 3mm. For example, it can be any value between 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm or 0.5mm to 3mm, and there is no specific limitation here.

[0068] In this way, the width of the cut section 12 is within a suitable range, which can avoid the cut section 12 being too wide and occupying too much solar cell area, thus affecting the subsequent cell efficiency. It can also avoid the cut section 12 being too narrow and having poor isolation effect, thus causing leakage.

[0069] It should be noted that the length of the cutting section 12 is the same as the length of the segmented section 11. In this way, complete isolation can be achieved between two adjacent segmented sections 11, preventing leakage of electricity.

[0070] In some embodiments, the identification mark 13 is disposed on the passivation layer 16 corresponding to the front side of the cut portion 12, and the solar cell further includes a protective layer; the protective layer is disposed on the front side of the cell body 10, at least on the front side of the segmented portion 11 in the cell body 10, and the protective layer is located outside the identification mark 13.

[0071] Specifically, the front of the slitting section 11 is provided with a protective layer, while the front of the cutting section 12 is not provided with a protective layer.

[0072] In practical applications, a laser can be used to first form an identification mark 13 on the passivation layer 16 corresponding to the front of the cutting part 12, and then a protective layer can be set on the front of the battery body 10 after the identification mark 13 is formed.

[0073] In this way, when solar cells are stacked, transported, and stored, the protective layer can prevent wear and scratches on the power generation area of ​​the solar cells.

[0074] In some embodiments, the solar cell further includes a protective layer; the protective layer is disposed on the front side of the cell body 10 and also on the front side of the cut portion 12 in the cell body 10.

[0075] Specifically, a protective layer is provided on the front side of the slitting part 11, and similarly, a protective layer is provided on the front side of the cutting part 12.

[0076] This ensures that the solar cell is protected from wear and scratches, simplifies the protective layer preparation process, and improves preparation efficiency.

[0077] In some embodiments, the materials used to prepare the protective layer include at least one or more of a crosslinking agent, an antioxidant, a light stabilizer, and a light transfer agent.

[0078] Understandably, adding crosslinking agents can increase the mechanical strength and heat resistance of solar cells.

[0079] It should be noted that antioxidants can be one or more of hindered phenols, aromatic amines, thioesters, and phosphites. Understandably, adding antioxidants can inhibit the thermo-oxidative aging of solar cells.

[0080] It should be noted that the light stabilizer can be one or more of benzophenone, benzotriazole, and hindered amine light stabilizers. Understandably, by adding light stabilizers, ultraviolet radiation can be blocked, UV attenuation reduced, and light damage repaired, thus protecting the reliability of solar cells.

[0081] It should be noted that the light transfer agent europium can be (Eu³) + Complexes, terbium (Tb³) + The light conversion agent can be one or more of the following: rare earth ion complexes, cerium dioxide, and benzotriazoles. It is understandable that by adding a light conversion agent, harmful ultraviolet light (e.g., wavelengths of 200–400 nm) from sunlight can be absorbed and converted into effective light needed for power generation, thereby improving the light energy utilization rate of the solar cell.

[0082] As one possible implementation method, a protective layer can be formed on the surface of the battery body 10 by means of spin coating, spraying, scraping, rolling, dipping, or adhesive application on the surface of the battery cell.

[0083] In some embodiments, the solar cell further includes a tunneling layer 18 located between the silicon substrate 14 and the doped layer 15. The tunneling layer 18 and the doped layer 15 are stacked together.

[0084] The material used to prepare the tunneling layer 18 can be one or more of silicon oxide, silicon nitride, silicon oxynitride, silicon carbide, or magnesium fluoride.

[0085] This reduces interfacial recombination losses, increases the open-circuit voltage and fill factor of the battery, and thus improves the photoelectric conversion efficiency of the battery.

[0086] As one possible preparation method, the silicon substrate 14 can be wet-processed, and an oxide layer (such as silicon oxide) can be grown on the wet-processed silicon substrate 14 to prepare the tunneling layer 18 on the silicon substrate 14.

[0087] In one embodiment of the present invention, the passivation layer 16 includes a via, and the solar cell further includes a metal layer 17, which is electrically connected to the doped layer 15 through the via.

[0088] Specifically, vias can be formed in the area to be metallized in the passivation layer 16 using laser or etching methods to expose the doped layer 15. Furthermore, a metal layer 17 can be formed on the exposed doped layer 15 using methods such as screen printing.

[0089] The metal layer 17 is made of one or more materials selected from Cu, Al, and Ag. Thus, Cu and Al can give the metal layer 17 good conductivity, reduce series resistance, and improve battery efficiency.

[0090] It is understood that in such embodiments, the photovoltaic module corresponding to the solar cell may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film can be filled between the front and back of the solar cell, as well as between the photovoltaic glass and adjacent cells. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film can be EVA film or POE film, and the specific choice can be made according to the actual situation, without limitation.

[0091] Photovoltaic glass can be applied to the encapsulating film on the front of solar cells. This photovoltaic glass can be ultra-clear glass, characterized by high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the solar cells while minimizing impact on their efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cells together, providing sealing, insulation, and waterproofing / moisture protection for the solar cells.

[0092] The backsheet is attached to the encapsulant film on the back of the solar cell. It protects and supports the solar cell, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite encapsulant film, with specific choices depending on the specific circumstances. The backsheet, solar cell, encapsulant film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire photovoltaic module, providing stable support and installation. For example, the photovoltaic module can be installed at the desired location using the metal frame.

[0093] The photovoltaic system of this application embodiment includes the photovoltaic module described above.

[0094] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic modules; for example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0095] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Furthermore, the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A solar cell, characterized in that, include: A battery body; comprising several segmented sections and several cut sections; the cut sections are located between two adjacent segmented sections; The area corresponding to the cut section is provided with an identification mark; the identification mark is used to correspond to the battery information of the solar cell.

2. The solar cell according to claim 1, characterized in that, The identification mark is disposed on the passivation layer of the corresponding area of ​​the cut portion, and the identification mark is a through hole on the passivation layer.

3. The solar cell according to claim 2, characterized in that, The passivation layer corresponding to the cutting part is the passivation layer of the back side of the cutting part, or the passivation layer corresponding to the cutting part is the passivation layer of the front side of the cutting part.

4. The solar cell according to claim 1, characterized in that, Along the width direction of the cut portion, the size of the identification mark is 10um to 500um.

5. The solar cell according to claim 1, characterized in that, The arrangement of the identification marks includes any of the following: arranged along the width direction of the cut portion, arranged along the length direction of the cut portion, or arranged in a dot matrix manner.

6. The solar cell according to claim 2, characterized in that, The via extends deep into the silicon substrate to form a recess, the depth of which is 2nm to 35nm.

7. The solar cell according to claim 5, characterized in that, The spacing between two adjacent identification marks is 30mm to 90mm.

8. The solar cell according to claim 1, characterized in that, The identification identifier is one or more of the following: Morse code, triangle, circle, ellipse, quadrilateral, number, and letter.

9. The solar cell according to claim 1, characterized in that, The width of the cut portion is 0.5mm to 3mm.

10. The solar cell according to claim 1, characterized in that, The number of the segmented parts is 2 to 6.

11. The solar cell according to claim 10, characterized in that, When the number of the segmented parts is 3 to 6, the identification mark is distributed in one or more areas corresponding to the cut part.

12. The solar cell according to claim 1, characterized in that, It also includes a protective layer; The protective layer is disposed on the front side of the battery body, at least on the front side of the segmented portion in the battery body, and the protective layer is located outside the identification mark.

13. The solar cell according to claim 1, characterized in that, The battery information includes one or more of the following: cell grade, cell conversion efficiency, cell light-receiving film color, cell manufacturing time, cell manufacturing equipment, cell Isc-Voc information, cell Electroluminescence Test information, and cell Photoluminescence information.

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