A solar cell, a cell assembly, and a photovoltaic assembly

Abstract

The application is suitable for the photovoltaic technical field, and provides a solar cell, a cell assembly and a photovoltaic assembly.The solar cell comprises a silicon substrate, a first doped region and a second doped region are alternately arranged along a first direction on a back light surface of the silicon substrate, and the first doped region and the second doped region are different in polarity; a first collecting grid line and a second collecting grid line, the first collecting grid line is arranged in the first doped region, and the second collecting grid line is arranged in the second doped region; the back light surface is provided with a mark point group, a single mark point group comprises at least three mark points arranged along the first direction, the mark points are arranged on the first collecting grid line or the second collecting grid line, and the first collecting grid line or the second collecting grid line is cut off.The risk of angle deviation between the two is eliminated, and the alignment accuracy is improved.Meanwhile, the mark points cut off the corresponding collecting grid lines, the fracture has high contrast in the continuous grid line background, and the accuracy of identification and capture is further improved.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic technology, and particularly relates to a solar cell, a battery module, and a photovoltaic module. Background Technology

[0002] As the photovoltaic industry increasingly demands higher module power density and conversion efficiency, high-efficiency solar cell technologies such as back-contact (IBC / BC) are widely used. In these cells, both the positive and negative electrodes are located on the back side. The intricate, periodic electrode grid lines (such as the first and second collection grid lines) within the cells place extremely stringent requirements on the positioning and orientation accuracy of the cells during advanced manufacturing processes such as stringing, shingling, and high-density packaging.

[0003] Traditional visual recognition methods suffer from problems such as a single reference, ambiguous directional information, and susceptibility to interference, which lead to potential angular deviations in the alignment process, resulting in low recognition accuracy and hindering further improvements in component yield and performance. Summary of the Invention

[0004] This invention provides a solar cell, a battery module, and a photovoltaic module, aiming to solve the problem of low identification accuracy in traditional identification methods.

[0005] The present invention is implemented as follows: a solar cell, comprising: A silicon substrate, wherein a first doped region and a second doped region are alternately disposed along a first direction on the back surface of the silicon substrate, wherein the first doped region and the second doped region have opposite polarities; A first collection gate line and a second collection gate line, wherein the first collection gate line is disposed within a first doped region and the second collection gate line is disposed within a second doped region; The backlight surface is provided with a group of marker points, and each group of marker points includes at least two or three marker points arranged along a first direction. The marker points are set on a first collection grid line or a second collection grid line, and the first collection grid line or the second collection grid line is cut off.

[0006] Optionally, a single group of marker points includes at least three marker points arranged along a first direction. The group of marker points includes a first marker point, a second marker point, and a third marker point arranged sequentially along the first direction, wherein the distance between the first marker point and the second marker point is greater than the distance between the third marker point and the second marker point.

[0007] Optionally, the silicon substrate has at least one original edge extending along a second direction, which intersects the first direction; The distance from the first marker point to the original edge is less than the distances from the second marker point and the third marker point to the original edge.

[0008] Optionally, the distance from the first marked point to the original edge is 1cm to 3cm.

[0009] Optionally, the first marker point and the second marker point are respectively set on collection grid lines of different polarities, and the distance between them is greater than the distance between two adjacent first collection grid lines and second collection grid lines.

[0010] Optionally, along the second direction, the silicon substrate has alternately arranged first serial connection regions and second serial connection regions, wherein in the first serial connection region, the first collection gate line is continuous and the second collection gate line is disconnected; and in the second serial connection region, the second collection gate line is continuous and the first collection gate line is disconnected. When the marker point cuts off the first collection grid line, the first collection grid line remains continuous within the second serial connection area adjacent to the marker point; When the marker point cuts off the second collection grid line, the second collection grid line remains continuous within the first serial connection area adjacent to the marker point.

[0011] Optionally, the two ends of the disconnected first collection grid line are connected by a conductive structure, and the width of the conductive structure is greater than the width of the first collection grid line; and / or, the two ends of the disconnected second collection grid line are connected by a conductive structure, and the width of the conductive structure is greater than the width of the second collection grid line. Optionally, the set of marker points is provided in two groups, symmetrically arranged along the central axis of the second direction.

[0012] Optionally, the solar cell is a two-piece structure, the silicon substrate has a cut edge disposed opposite to the original edge, and the distance from the third mark point to the cut edge is 1cm to 3.5cm.

[0013] The present invention also provides a battery assembly including the solar cell described above.

[0014] The present invention also provides a photovoltaic system including the above-described battery module.

[0015] The beneficial effects achieved by this invention are as follows: Since a single marker group includes at least three markers arranged along a first direction, and the markers are positioned on a first or second collection grid line, truncating the first or second collection grid line. The arrangement direction of the markers within the marker group is the same as the extension direction of a battery edge, achieving a unification of the "absolute reference" (battery edge as the reference) and the "relative reference" (the reference calibrated by the marker group). The two are parallel, eliminating the risk of angular deviation between them and improving alignment accuracy. Simultaneously, the markers truncate the corresponding collection grid line, resulting in high contrast at the break point against the continuous grid line background, further improving the accuracy of identification and capture. [Dong Haiying 2] Within the first serial connection area, the first collection grid line is continuous, while the second collection grid line is discontinuous; within the second serial connection area, the second collection grid line is continuous, while the first collection grid line is discontinuous. When a marker point interrupts the first collection grid line, the first collection grid line becomes continuous within the second serial connection area adjacent to that marker point; when a marker point interrupts the second collection grid line, the second collection grid line becomes continuous within the first serial connection area adjacent to that marker point. This prevents the collected grid lines on the discontinuous collection grid line from failing to be transferred to the solder ribbon, thus improving collection efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the solar cell provided by the present invention; Figure 2 This is a schematic diagram of the structure of a whole cell in two sections; Figure 3 This is an enlarged view of point A; Figure 4 This is an enlarged view of point B; Figure 5 This is an enlarged view of point C; Figure 6 This is a schematic diagram of a single, uncut solar cell. Figure 7 This is a schematic diagram of the cutting process for a two-piece battery. Figure 8 This is a schematic diagram of a three-section battery.

[0017] Explanation of reference numerals in the attached figures: 100. Solar cell; 101. First collection grid line; 102. Second collection grid line; 110. Original edge; 120. Cut edge; 130. First series connection area; 140. First series connection area 210, First doped region; 220, Second doped region; 230, Spacer region; 310. Marker group; 311. First marker; 312. Second marker; 313. Third marker. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] In the description of this invention, 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. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly 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 for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. 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, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] This invention provides a single marker group comprising at least three markers arranged along a first direction. The markers are positioned on either a first or second collection grid line, truncating either the first or second collection grid line. The arrangement direction of the markers within the marker group is the same as the extension direction of a battery edge, achieving a unification of the "absolute reference" (battery edge as the reference) and the "relative reference" (the reference calibrated by the marker group). The parallelism between the two eliminates the risk of angular deviation and improves alignment accuracy. Simultaneously, the truncation of the corresponding collection grid line by the markers results in high contrast at the break point against the continuous grid line background, further enhancing the accuracy of identification and capture.

[0025] Example 1 like Figures 1 to 5 As shown, this embodiment provides a solar cell 100, including: A silicon substrate, wherein a first doped region 210 and a second doped region 220 are alternately disposed along a first direction on the back surface of the silicon substrate, wherein the first doped region 210 and the second doped region 220 have opposite polarities. A first collection gate line 101 and a second collection gate line 102 are disposed in a first doped region 210 and a second collection gate line 102 are disposed in a second doped region 220. The backlight surface is provided with a group of markers 310. Each group of markers 310 includes at least two or three markers arranged along a first direction. The markers are set on the first collection grid line 101 or the second collection grid line 102, and the first collection grid line 101 or the second collection grid line 102 is cut off.

[0026] A silicon substrate has two main surfaces: a light-facing surface and a back-lighting surface. The light-facing surface directly faces the sunlight, while the back-lighting surface is on the opposite side. The two surfaces are positioned opposite each other.

[0027] Two distinct regions, a first doped region 210 and a second doped region 220, are arranged alternately on the back surface of the silicon substrate. Specifically, a plurality of first doped regions 210 and a plurality of second doped regions 220 are arranged alternately along a first direction, and both the first doped regions 210 and 220 extend along a second direction, which intersects the first direction. The first doped regions 210 and 220 can be arranged alternately along the lateral direction of the silicon substrate and both extend along the longitudinal direction; that is, the first direction can be the lateral direction of the back contact cell, and the second direction can be the longitudinal direction of the back contact cell, and the two are perpendicular to each other. Of course, in other embodiments, the first direction and the second direction can also be other directions, for example, they can be the diagonal directions of the silicon substrate, and no specific limitation is made here.

[0028] A first doped layer is disposed within a first doped region 210, and a second doped layer is disposed within a second doped region 220. The first and second doped layers have opposite polarities; specifically, the first doped layer can be a P-type doped layer and the second doped layer can be an N-type doped layer, or vice versa. The first and second doped layers form regions with different electrical characteristics, supporting the formation of a PN junction and the separation of charge carriers. A first collection gate line 101 is disposed within the first doped region 210 to collect charge carriers generated in the first doped region 210, and a second collection gate line 102 is disposed within the second doped region 220 to collect charge carriers generated in the second doped region 220. Typically, a spacer region 230 is disposed between the first doped region 210 and the second doped region 220. The marker group 310 includes at least two or three marker points. Compared to a single marker point used for marking, the marker group 310 within the marker group 310 synthesizes a specific pattern, which can more accurately identify which side of the battery (up / down / left / right), the precise rotation angle of the battery (whether there is deflection), or the absolute position of the current field of view on the battery, etc.

[0029] At least two or three markers within a single marker group 310 are arranged along a first direction, i.e., consistent with the alternating direction of the first doped region 210 and the second doped region 220. Typically, two edges of the silicon substrate extend along this first direction, which is defined as the reference direction of the cell structure. The marker group 310 is set along this direction, providing a clear visual or machine vision reference axis for the spatial orientation of the entire cell. In subsequent cell string bonding, stacking, or module packaging processes, multiple cells need to be precisely aligned (usually aligning the main grid or cell edges). The marker group 310 along the first direction can serve as an inherent, strictly aligned ruler with the direction of the cell's functional structure (doped regions, grid lines), enabling more precise and stable relative position alignment and reducing accumulated errors.

[0030] Marker points are placed on either the first collection grid line 101 or the second collection grid line 102, truncating the corresponding collection grid line. Specifically, when a marker point is placed on the first collection grid line 101, the first collection grid line 101 is truncated; when a marker point is placed on the second collection grid line 102, the second collection grid line 102 is truncated. After the marker point truncates the grid line, it forms a clear break feature on the grid line, with the marker point positioned between the two ends of the break. This break has high contrast against the background of continuous grid lines and is easily captured by the vision system, further improving the accuracy of recognition and capture.

[0031] In this embodiment, a single marker group 310 includes at least two or three markers arranged along a first direction. The markers are positioned on the first collection grid line 101 or the second collection grid line 102, truncating either the first or second collection grid line 101. The arrangement direction of the markers within the marker group 310 is the same as the extension direction of a battery edge, achieving a unification of the "absolute reference" (battery edge as the reference) and the "relative reference" (the reference calibrated by the marker group 310). The two are parallel, eliminating the risk of angular deviation between them and improving alignment accuracy. Simultaneously, the markers truncate the corresponding collection grid line, resulting in high contrast at the break point against the continuous grid line background, further improving the accuracy of identification and capture.

[0032] In some embodiments, such as Figures 3 to 5 As shown, a single marker group 310 includes at least three markers arranged along a first direction. The marker group 310 includes a first marker 311, a second marker 312, and a third marker 313 arranged sequentially along the first direction, wherein the distance between the first marker 311 and the second marker 312 is less than the distance between the third marker 313 and the second marker 312.

[0033] The spacing between the three marker points is asymmetrical. The distance between the first marker point 311 and the second marker point 312 is smaller, while the distance between the third marker point 313 and the second marker point 312 is larger. That is, the second marker point 312 is biased towards the first marker point 311. The three points form an unequal spacing arrangement of "short spacing + long spacing". This creates a clear directional feature, which allows the vision system to uniquely determine the orientation of the solar cell (positive / negative direction of the first direction). This avoids the solar cells being rotated 180° and mis-assembled during stringing and lamination, reducing the misassembly rate and rework rate of automated production lines.

[0034] In some embodiments, the silicon substrate has at least one original edge 110 extending along a second direction, which intersects the first direction; the distance from the first marker point 311 to the original edge 110 is less than the distances from the second marker point 312 and the third marker point 313 to the original edge 110.

[0035] The original edge 110 of the silicon substrate is the edge formed during the silicon rod formation process, and it is not cut after the silicon wafer is cut. It should be noted that the solar cell 100 includes whole cells that do not require cutting and segmented cells. A whole cell that does not require cutting is a complete, uncut silicon wafer cell, meaning that each edge is the original edge 110, typically with four chamfers, such as... Figure 6 As shown. Segmented cells refer to cells cut into smaller pieces (two-piece, three-piece, etc.) along the direction of the collecting grid lines using laser or other cutting technologies. The area is proportionally reduced, but the voltage remains the same. The edge formed by the cut is called the cutting edge (120°). The number of chamfers on a single segmented cell is related to the number of segments cut, such as... Figure 7 and Figure 8 As shown (the red line is the cutting line).

[0036] The distance from the first marker point 311 to the original edge 110 is less than the distances from the second marker point 312 and the third marker point 313 to the original edge 110. That is, the first marker point 311 is the marker point closest to the original edge 110. Specifically, with the original edge 110 as the initial position, the first marker point 311, the second marker point 312 and the third marker point 313 are arranged in sequence, with the distance from the first marker point 311 to the original edge 110 being greater than the distance from the second marker point 312 to the original edge 110 being greater than the distance from the third marker point 313 to the original edge 110.

[0037] Specifically, the distance from the first marker point 311 to the original edge 110 is 1cm to 3cm. The original edge 110 of the silicon wafer exists during the silicon rod formation process. During this process, some defects may exist, and the closer to the edge of the original edge 110, the greater the possibility of defects forming. If the distance from the first marker point 311 to the original edge 110 is too small (less than 1cm), and too close to the edge, setting the first marker point 311 at the defect location will cause further damage to that location, making it prone to cracks, edge chipping, or being affected by excess encapsulating adhesive, resulting in the marker point being contaminated, covered, or incomplete, losing its identification function. If the distance from the first marker point 311 to the original edge 110 is too large (greater than 3cm), the marker point group 310 is associated with a stable and unchanging physical feature (the original edge 110), defining the absolute position of the battery in the second direction. The first marker point 311 acts as a "near-edge reference point." Setting the positioning point closer to the edge results in smaller errors and more accurate positioning. Conversely, if the positioning point is far from the edge, the error is larger, affecting the positioning accuracy.

[0038] Specifically, when the solar cell 100 is a two-piece cell, it is formed by cutting a whole cell in one cut, with a cut edge 120, and the distance from the third mark point 313 to the cut edge 120 is 1cm to 3.5cm.

[0039] In some embodiments, the first marker point 311 and the second marker point 312 are respectively disposed on collection grid lines of different polarities, and the distance between them is greater than the distance between two adjacent first collection grid lines 101 and second collection grid lines 102.

[0040] Specifically, when the first marker point 311 is set on the first collection grid line 101, the second marker point 312 is set on the second collection grid line 102; when the first marker point 311 is set on the second collection grid line 102, the second marker point 312 is set on the first collection grid line 101. Furthermore, the distance between the two is greater than the distance between two adjacent first collection grid lines 101 and second collection grid lines 102, meaning that the first marker point 311 and the second marker point 312 are separated by at least one set of adjacent first collection grid lines 101 and second collection grid lines 102. This larger spacing makes them more prominent in the micro-grid pattern, easier to distinguish from background noise, and improves the overall detection accuracy and speed of the marker point group 310.

[0041] When the collection grid line at the marked point location is disconnected, the transport of charge carriers collected by the disconnected collection grid line is affected. The first marked point 311 and the second marked point 312 are respectively set on collection grid lines of different polarities to balance the impact on the two polarities of collection grid lines.

[0042] In some embodiments, along a second direction, the silicon substrate has alternating first and second serial regions. In the first serial region, the first collection gate line 101 is continuous and the second collection gate line 102 is disconnected. In the second serial region within the intermediate region, the second collection gate line 102 is continuous and the first collection gate line 101 is disconnected. When a marker point cuts off the first collection gate line 101, the first collection gate line 101 is continuous in the second serial region adjacent to the marker point. When a marker point cuts off the second collection gate line 102, the second collection gate line 102 is continuous in the first serial region adjacent to the marker point.

[0043] In the connection of the battery assembly, solder ribbons are used to connect several solar cells 100 in series to form a battery string. The solder ribbons are located in the first and second series connection areas. The solder ribbons are electrically connected to the collection grid lines in the corresponding series connection areas, and the charge carriers collected by the collection grid lines are conducted to the outside through the solder ribbons. At the same time, the collection grid lines of the other polarity are disconnected in the series connection area to avoid short circuits. For example, when the solder ribbon is located in the first series connection area, it is electrically connected to the first collection grid line 101 located in the first series connection area, and the second collection grid line 102 is disconnected in the first series connection area to avoid short circuits caused by contact with the solder ribbon. When the solder ribbon is located in the second series connection area, it is electrically connected to several second collection grid lines 102 located in the second series connection area, and the first collection grid lines 101 are disconnected in the second series connection area to avoid short circuits caused by contact with the solder ribbon.

[0044] The collection grid line at the marked point is cut off. On either side of the marked point are concatenation areas of different polarities, used to connect collection grid lines of different polarities with solder ribbons. One segment of the cut collection grid line is connected to the solder ribbon in an adjacent concatenation area of ​​the same polarity, while the other segment is connected in an adjacent concatenation area of ​​a different polarity, and then connected to the solder ribbon in the next concatenation area of ​​the same polarity. This prevents the collected grid line from failing to transfer to the solder ribbon, thus improving collection efficiency.

[0045] When the first collecting grid line 101 is interrupted at the marked point, the first collecting grid line 101 remains continuous within the second serial connection area adjacent to the marked point. Specifically, the first collecting grid line 101 can be interrupted at this position, and the two ends of the interrupted first collecting grid line 101 can be connected by a conductive structure. The width of the conductive structure can be greater than the width of the first collecting grid line 101 to avoid connection failures due to process errors during connection. Alternatively, the first collecting grid line 101 itself can remain continuous at this position, and be thickened at this position to reduce transmission resistance. Understandably, when setting the solder strip subsequently, an insulating medium needs to be placed at the corresponding position of the first collecting grid line 101.

[0046] When the marker point cuts off the second collecting grid line 102, the second collecting grid line 102 remains continuous within the first serial connection area adjacent to the marker point. Specifically, the second collecting grid line 102 can be broken at this position, and the two ends of the broken second collecting grid line 102 can be connected by a conductive structure. The width of the conductive structure can be greater than the width of the second collecting grid line 102 to avoid connection failures due to process errors during connection. Alternatively, the second collecting grid line 102 itself can be continuous at this position, and thickened at this position to reduce transmission resistance. Understandably, when setting the solder strip subsequently, an insulating medium needs to be placed at the corresponding position of the second collecting grid line 102.

[0047] Specifically, the shape of the conductive structure can be various shapes such as I-shaped, rectangular, bow-shaped, or rhomboid, and is not limited here.

[0048] In some embodiments, the marker point group 310 is provided in two groups, symmetrically arranged along the central axis of the second direction.

[0049] Typically, four sets of marker points 310 need to be set on a single solar cell. The first set of marker points 311 and the second set of marker points 312 are symmetrical about the central axis along the first direction. The second set of marker points 312 and the third set of marker points 313 are symmetrical about the central axis along the second direction. The third set of marker points 313 and the fourth set of marker points 310 are symmetrical about the central axis along the first direction. The fourth set of marker points 310 and the first set of marker points 311 are symmetrical about the central axis along the second direction.

[0050] When the solar cell 100 is a two-cell cell, the marking point group 310 on one cell is the first marking point group 311 and the fourth marking point group 310, and the marking point group 310 on the other cell is the second marking point group 312 and the third marking point group 313.

[0051] Example 2 This embodiment provides a battery assembly, including the solar cell 100 described above.

[0052] The battery module may include multiple back-contact solar cells 100 each. The multiple back-contact solar cells 100 each in the battery module can be connected in series to form a battery string. The battery strings can be connected in series, in parallel, or in a series-parallel combination to achieve current collection and output. For example, the connection between the individual cells can be achieved by welding solder strips, or the connection between the battery strings can be achieved by busbars.

[0053] The battery module may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulant film (not shown in the figures). The encapsulant film can be filled between the light-facing side of the solar cell 100 and the photovoltaic glass, the back-facing side and the backsheet, and adjacent cells. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulant film can be EVA film or POE film, and the specific choice can be made according to the actual situation. There are no restrictions here.

[0054] Photovoltaic glass can be applied to the encapsulating film on the light-facing side of the solar cell 100. The photovoltaic glass can be ultra-clear glass, which has 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%. It can protect the solar cell 100 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell 100 together, providing sealing, insulation, waterproofing, and moisture protection for the solar cell 100.

[0055] The backsheet can be attached to the adhesive film on the back side of the solar cell 100. The backsheet provides protection and support for the solar cell 100, offering reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, and aluminum alloy TPT composite adhesive film, etc. The specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell 100, adhesive film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire battery module, providing stable support and installation. For example, the battery module can be installed at the desired location using the metal frame.

[0056] The beneficial effects of the battery module in this embodiment are equivalent to those of the solar cell 100 described above, and will not be repeated here.

[0057] Example 3 This embodiment provides a photovoltaic system, including the aforementioned battery module.

[0058] Photovoltaic systems can be applied in photovoltaic power plants, such as ground-mounted, rooftop, and floating power plants, as well as in 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's understandable that the application scenarios of photovoltaic systems are not limited to these; that is, photovoltaic systems can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation network as an example, a photovoltaic system can include photovoltaic arrays, combiner boxes, and inverters. A photovoltaic array can be a combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic arrays are connected to combiner boxes, which collect the current generated by the photovoltaic arrays. The collected current flows through an inverter and is converted into AC power required by the mains grid before being connected to the mains grid to achieve solar power supply.

[0059] The beneficial effects of the photovoltaic system in this embodiment are equivalent to the beneficial effects of the battery module described above, and will not be repeated here.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solar cell, characterized in that, include: A silicon substrate, wherein a first doped region and a second doped region are alternately disposed along a first direction on the back surface of the silicon substrate, wherein the first doped region and the second doped region have opposite polarities; A first collection gate line and a second collection gate line, wherein the first collection gate line is disposed within a first doped region and the second collection gate line is disposed within a second doped region; The backlight surface is provided with a group of marker points, and each group of marker points includes at least two or three marker points arranged along the first direction [Dong Haiying 1]. The marker points are set on the first collection grid line or the second collection grid line, and the first collection grid line or the second collection grid line is cut off.

2. The solar cell as described in claim 1, characterized in that, A single group of marker points includes at least three marker points arranged along a first direction. The group of marker points includes a first marker point, a second marker point, and a third marker point arranged sequentially along the first direction, wherein the distance between the first marker point and the second marker point is greater than the distance between the third marker point and the second marker point.

3. The solar cell as described in claim 2, characterized in that, The silicon substrate has at least one original edge extending along a second direction, which intersects the first direction; The distance from the first marker point to the original edge is less than the distances from the second marker point and the third marker point to the original edge.

4. The solar cell as described in claim 3, characterized in that, The distance from the first marked point to the original edge is 1cm to 3cm.

5. The solar cell as described in claim 2, characterized in that, The first marker point and the second marker point are respectively set on collection grid lines of different polarities, and the distance between them is greater than the distance between two adjacent first collection grid lines and second collection grid lines.

6. The solar cell as described in claim 3, characterized in that, Along the second direction, the silicon substrate has alternately arranged first serial connection regions and second serial connection regions, wherein in the first serial connection region, the first collection gate line is continuous and the second collection gate line is disconnected; and in the second serial connection region, the second collection gate line is continuous and the first collection gate line is disconnected. When the marker point cuts off the first collection grid line, the first collection grid line remains continuous within the second serial connection area adjacent to the marker point; When the marker point cuts off the second collection grid line, the second collection grid line remains continuous within the first serial connection area adjacent to the marker point.

7. The solar cell as claimed in claim 6, characterized in that, By setting a conductive structure to connect the two ends of the disconnected first collection grid line, the width of the conductive structure is greater than the width of the first collection grid line. And / or, by providing a conductive structure to connect the two ends of the disconnected second collection grid line, wherein the width of the conductive structure is greater than the width of the second collection grid line.

8. The solar cell as claimed in claim 1, characterized in that, The marker point group is set in two groups, symmetrically arranged along the central axis of the second direction.

9. The solar cell as described in claim 3, characterized in that, The solar cell is divided into two sections, and the silicon substrate has a cut edge that is opposite to the original edge. The distance from the third mark point to the cut edge is 1cm to 3.5cm.

10. A battery assembly, characterized in that, Including the solar cells described in claims 1-9.

11. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 10.

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