Battery assembly and photovoltaic system

Abstract

The application is suitable for the technical field of solar cells, and provides a battery assembly and a photovoltaic system, which comprise a plurality of battery strings, each battery string comprising a plurality of cell pieces; the cell piece comprises a chamfer, a right angle and a cell edge; the cell edge connects the chamfer and the right angle; the chamfers of the cell pieces of the same battery string are oriented in the same direction; the direction of the chamfer is parallel to the extension direction of the cell edge and points from the right angle to the chamfer; and each cell piece comprises at least one chamfer. The application can make the chamfers of the cell pieces of the same battery string be oriented in the same direction, so that the visual effect is better; and when the battery assembly is prepared, if the chamfers of the cell pieces of the same battery string are oriented in the same direction, the battery string does not need to be rotated, so that the risk of hidden cracking and string falling of the cell piece is reduced.

Description

Technical Field

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

[0002] In traditional battery modules, solder ribbons connect adjacent cells to form a battery string, and busbars connect multiple battery strings to form a battery array. However, the different chamfer orientations of the cells result in a poor appearance for the battery module. Furthermore, the chamfered portions of traditional cells pose a significant risk of microcracks during subsequent welding and lamination processes. Traditional welding methods require adjacent battery strings to have different chamfer orientations, necessitating alternating 180° rotations in the battery stringing equipment. Utility Model Content This application provides a battery module and photovoltaic system, which aims to solve the problem of battery cells being prone to microcracks and fragmentation during welding and subsequent lamination.

[0003] To achieve the above objectives, this utility model provides the following technical solution: First, a battery assembly is provided, comprising a plurality of battery strings, each battery string comprising a plurality of battery cells; the battery cells include chamfers, right angles, and battery edges; The battery edge connects to a chamfer and a right angle. The chamfers of the cells in the same battery string face the same direction. The chamfer direction is parallel to the extension direction of the battery edge and points from the right angle to the chamfer. Each cell includes at least one chamfer.

[0004] In some embodiments, the cell type includes a first cell and a second cell; each first cell and second cell includes at least one chamfer; the grid pattern of the first cell and the second cell is symmetrical about the right-angled side; the right-angled side is the side excluding the chamfer.

[0005] In some embodiments, each first segment is electrically connected to at least two second segments, and each second segment is electrically connected to at least two first segments.

[0006] In some embodiments, the number of battery strings is multiple, and the chamfers of the multiple battery strings face the same direction.

[0007] In some embodiments, for adjacent battery strings, every two adjacent segments are of the same type in the vertical direction of the chamfer orientation.

[0008] In some embodiments, the battery assembly includes a central busbar, and the battery strings include a first battery string and a second battery string; the central busbar connects the first battery string and the second battery string in parallel, and the chamfer orientation of the first battery string is opposite to that of the second battery string.

[0009] In some embodiments, the chamfers of the first and second battery strings are both oriented away from the central busbar.

[0010] In some embodiments, the chamfers of the first and second battery strings are both oriented towards the central busbar.

[0011] In some embodiments, the battery string includes an adjacent first segment and a second segment, with the first segment overlapping the second segment.

[0012] In some embodiments, the overlap width is 0.1mm-1.5mm.

[0013] In some embodiments, the battery string includes a solder strip connecting a first segment and a second segment, wherein the right angle of the first segment overlaps the chamfer of the second segment near the side of the solder strip.

[0014] In some embodiments, the battery string includes a solder strip connecting a first segment and a second segment, wherein the right angle of the first segment overlaps the chamfer of the second segment on the side opposite to the solder strip.

[0015] Secondly, this utility model provides a photovoltaic system, including any of the aforementioned battery components.

[0016] The beneficial effects of this utility model are as follows: In the battery module of this application embodiment, since the chamfers of the cells in the same battery string face the same direction, the battery string is symmetrical about the arrangement direction of the cells, which is more aesthetically pleasing and has a better visual effect. Furthermore, when manufacturing the battery module, if the chamfers of the cells in the same battery string face the same direction, there is no need to rotate the battery string, reducing the risk of microcracks and cell drop in the solar cells. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a battery assembly according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 4 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 5 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 6 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 7 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 8 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 9 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application; Figure 10 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application.

[0018] Key component symbols: 100, battery assembly; 110, battery string; 1011, battery cell; 120, central busbar; 111, first battery string; 112, second battery string; 113, third battery string; 114, fourth battery string; 1012, first segment; 1013, second segment; 1014, N-pole fine grid; 1015, P-pole fine grid; 10112, right-angled edge; 10111, battery edge. Detailed Implementation

[0019] 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.

[0020] 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. They 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. Therefore, they should not be construed as limitations on this application.

[0021] 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, 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Please see Figure 1 This application provides a battery assembly 100, which includes a plurality of battery strings 110, each battery string including a plurality of battery cells 1011; the battery cells 1011 include chamfers, right angles and battery edges 10111.

[0026] The battery edge 10111 connects the chamfer and the right angle. The chamfers of the battery cells 1011 in the same battery string 110 have the same direction. The chamfer direction is parallel to the extension direction of the battery edge 10111 and points from the right angle to the chamfer. Each battery cell 1011 includes at least one chamfer.

[0027] It is understood that in the battery assembly 100 of this application embodiment, since the chamfers of the battery cells 1011 in the same battery string 110 face the same direction, the battery string 110 is symmetrical about the battery cells 1011, which is more aesthetically pleasing and has a better visual effect. Furthermore, when manufacturing the battery assembly 100, if the chamfers of the battery cells in the same battery string 110 face the same direction, there is no need to rotate the battery string 110, reducing the risk of microcracks and cell breakage in the battery cells 1011.

[0028] When there are multiple chamfers on the same solar cell 1011, the side with multiple chamfers is called a chamfered side, and the side without chamfers is called a right-angled side.

[0029] Understandably, the chamfered edge design helps reduce stress concentration at the edges of the 1011 solar cell, which is beneficial to improving the mechanical stability of the 1011 solar cell.

[0030] In the case where the battery assembly 100 includes an end busbar, the chamfer orientation may point towards the end busbar, or the chamfer orientation may be away from the end busbar, or the chamfer orientation may be any extending direction of the end busbar.

[0031] In this configuration, several battery strings 110 are arranged side by side along a first direction, with a spacing between adjacent battery strings 110. The battery strings 110 can be formed by connecting multiple solar cells in the battery module 100 in series to achieve a series current collection output. For example, the battery cells 1011 can be connected in series by setting solder strips (busbars, interconnecting strips), conductive backplates, etc.

[0032] It should be noted that the "first direction" is not a general concept with a fixed orientation, but rather a relative direction introduced to describe the arrangement of the battery strings 110, used to clarify the order in which the multiple battery strings 110 are arranged. Imagine a plane or space; to clearly illustrate how the battery strings 110 are arranged sequentially, we call the direction they follow the "first direction." For example, if the multiple battery strings 110 are arranged horizontally, then the first direction is horizontal. Specifically, the battery strings 110 can be arranged horizontally from left to right or from right to left. Similarly, if the multiple battery strings 110 are arranged vertically, then the first direction is vertical. Specifically, the battery strings 110 can be arranged vertically from top to bottom or from bottom to top. Of course, if the multiple battery strings 110 are arranged in other directions (such as a 45° diagonal line, a 60° diagonal line, etc.), then the first direction is another direction, which is not limited here.

[0033] In some embodiments, such as Figure 2 As shown, the type of the battery cell 1011 may include a first segment 1012 and a second segment 1013; each first segment 1012 and second segment 1013 includes at least one chamfer. The grid pattern of the first segment 1012 and the second segment 1013 is symmetrical about the right-angled side 10112; the right-angled side 10112 is the side without the chamfer.

[0034] A single whole cell can be divided into a first segment 1012 and a second segment 1013.

[0035] For example, each of the first segment 1012 and the second segment 1013 may each include two chamfers. The chamfers of the first segment 1012 and the second segment 1013 have the same orientation. Of course, the first segment 1012 and the second segment 1013 may each include other numbers of chamfers, which is not limited here.

[0036] Because the chamfers of the first segment 1012 and the second segment 1013 face the same direction, the battery string is symmetrical about the cell 1011, resulting in a more aesthetically pleasing and visually appealing arrangement. Furthermore, if the chamfers of the first segment 1012 and the second segment 1013 face the same direction during battery assembly, there is no need to rotate the battery string 110, reducing the risk of microcracks and string breakage in the solar cells.

[0037] The solar cell 1011 also includes N-type fine grids 1014 and P-type fine grids 1015 arranged in sequence.

[0038] In some embodiments, such as Figure 3 As shown, the battery assembly 100 includes a first region and a second region. In the first region, the chamfers of the first segment 1012 and the second segment 1013 face the same direction. In the second region, the chamfers of the first segment 1012 and the second segment 1013 face the same direction, but the chamfers of the first segment 1013 and the second segment 1013 in the first region face opposite directions to those in the second region. The chamfered edge of the battery cell 1011 in the first region is opposite to the chamfered edge of the battery cell 1011 in the second region. The first region and the second region are located on different sides of the central busbar 120.

[0039] Or, such as Figure 4 As shown, the chamfers of all the battery cells 1011 are facing away from the central busbar 120.

[0040] This achieves another arrangement of the battery string 110, which can improve the visual effect of the battery string 110, reduce the risk of microcracks and string breakage of the battery cells 1011, and further enrich the combination methods of the battery string 110.

[0041] In some embodiments, such as Figure 5 As shown, the chamfers of the multiple battery strings 110 face the same direction.

[0042] This achieves another arrangement of the battery string 110, which can improve the visual effect of the battery string 110, reduce the risk of microcracks and string breakage of the battery cells 1011, and further enrich the combination methods of the battery string 110.

[0043] In some embodiments, each first segment 1012 is electrically connected to at least one second segment 1013, and each second segment 1013 is electrically connected to at least one first segment 1012.

[0044] For example, if the first segment is the end of a battery cell, then the first segment is electrically connected to one second segment. If the first segment is not the end of a battery cell, then the first segment is electrically connected to two second segments.

[0045] For example, if the second segment is the end of a battery cell, then the second segment is electrically connected to one of the first segments. If the second segment is not the end of a battery cell, then the second segment is electrically connected to two of the first segments.

[0046] In this way, the first segment 1012 and the second segment 1013 are arranged alternately, making the battery string symmetrical, more beautiful, and with a better visual effect.

[0047] In some embodiments, there are multiple battery strings 110, and the chamfers of the multiple battery strings 110 face the same direction.

[0048] For example, when the number of battery cells in a battery string is even, the chamfers of the same multiple battery strings 110 face the same direction.

[0049] For example Figure 6 As shown, the battery assembly 100 includes a central busbar 120, and the battery string 110 includes a first battery string 111 and a second battery string 112.

[0050] The first battery string 111 is located on one side of the central busbar 120, and the second battery string 112 is located on the other side of the central busbar 120.

[0051] The chamfer of the first battery string 111 can face the central busbar 120, while the chamfer of the second battery string 112 can face away from the central busbar 120, so that the chamfers of the multiple battery strings 110 have the same orientation. This achieves another arrangement of battery strings where the chamfers of the multiple battery strings 110 have the same orientation, which can improve the visual appearance of the battery strings 110, reduce the risk of microcracks and string breakage in solar cells, and further enrich the combination methods of the battery strings 110.

[0052] It should be noted that in the battery string 110, the battery string 110 may include two battery cells 1011 connected in series, three battery cells 1011 connected in series, or other numbers of battery cells 1011. The specific number of battery cells 1011 that need to be connected in series can be determined according to the actual use.

[0053] Optionally, adjacent cells 1011 in the same battery string 110 can be connected in series by means of soldering ribbons or other methods.

[0054] In some embodiments, such as Figure 7As shown, the chamfer of the first battery string 111 can be directed away from the central busbar 120, and the chamfer of the second battery string 112 can be directed towards the central busbar 120, so that the chamfers of the multiple battery strings 110 have the same orientation.

[0055] In some other embodiments, the chamfer orientation of the first battery string 111 and the second battery string 112 may also be the same as the extension direction away from the central busbar 120.

[0056] This achieves another way of arranging battery strings, which can improve the visual effect of battery string 110, reduce the risk of microcracks and string breakage of battery cells 1011, and further enrich the combination methods of battery string 110.

[0057] Understandably, when the chamfers of multiple battery strings 110 are all oriented in the same direction, the appearance of the battery assembly 100 can be more aesthetically pleasing. Furthermore, when manufacturing the battery assembly 100, there is no need for the battery strings 110 to rotate alternately, which reduces the risk of microcracks in the battery cells 1011.

[0058] In some embodiments, such as Figure 3 As shown, for adjacent battery strings 110, in the vertical direction of the chamfer orientation, every two adjacent segments are of the same type. The battery cell 1011 includes a first segment 1012 and a second segment 1013.

[0059] That is, for adjacent battery strings 110, in the vertical direction of the chamfer, the first segment 1012 (i.e., segment A in the figure) is adjacent to the first segment 1012, and the second segment 1013 (i.e., segment B in the figure) is adjacent to the second segment 1013.

[0060] In some embodiments, the battery assembly 100 includes a central busbar 120, and the battery string 110 includes a first battery string 111 and a second battery string 112.

[0061] The central busbar 120 is connected in parallel with the first battery string 111 and the second battery string 112, and the chamfer of the first battery string 111 faces the opposite direction to the chamfer of the second battery string 112.

[0062] For example, when the number of battery cells in a battery string is odd, the chamfer orientation of the first battery string 111 is opposite to that of the second battery string 112.

[0063] This achieves another arrangement of the battery string 110, which can improve the visual effect of the battery string 110, reduce the risk of microcracks and string breakage of the battery cells 1011, and further enrich the combination methods of the battery string 110.

[0064] The central busbar 120 is located between the first battery string 111 and the second battery string 112. For example, when the first battery string 111 and the second battery string 112 overlap, the central busbar 120 can be located in the overlapping area of ​​the first battery string 111 and the second battery string 112. When there is a gap between the first battery string 111 and the second battery string 112, the central busbar 120 can be located in the area corresponding to the gap between the first battery string 111 and the second battery string 112.

[0065] The following situations may occur when the chamfer orientation of the first battery string 111 is opposite to that of the chamfer orientation of the second battery string 112.

[0066] 1. The chamfers of the first battery string 111 and the second battery string 112 are both facing away from the central busbar 120.

[0067] 2. The chamfers of the first battery string 111 and the second battery string 112 are both oriented towards the central busbar 120.

[0068] Understandably, by setting the chamfer orientation of the first battery string 111 to be opposite to that of the second battery string 112, the battery strings 110 do not need to rotate alternately during the fabrication of the battery module 100, thus reducing the risk of microcracks in the battery cells 1011. Furthermore, this improves the applicability of the fabrication process for the battery module 100.

[0069] In some embodiments, such as Figure 8 As shown, the battery assembly 100 also includes a third battery string 113 and a fourth battery string 114.

[0070] The third battery string 113 and the first battery string 111 are located on the same side of the central busbar 120, and the second battery string 112 and the fourth battery string 114 are located on the same side of the central busbar 120.

[0071] In this embodiment, the chamfer orientation of the third battery string 113 may be the same as that of the first battery string 111. The chamfer orientation of the second battery string 112 may be the same as that of the fourth battery string 114.

[0072] This achieves another way of arranging battery strings, which can improve the visual effect of battery string 110, reduce the risk of microcracks and string breakage of battery cells 1011, and further enrich the combination methods of battery string 110.

[0073] At this time, the chamfers of the first battery string 111 and the third battery string 113 can face the central busbar 120, while the chamfers of the second battery string 112 and the fourth battery string 114 can face away from the central busbar 120.

[0074] Or, such as Figure 9As shown, the chamfers of the first battery string 111 and the third battery string 113 can be oriented away from the central busbar 120, and the chamfers of the second battery string 112 and the fourth battery string 114 can be oriented away from the central busbar 120.

[0075] Alternatively, the chamfers of the first battery string 111 and the third battery string 113 can be oriented toward the central busbar 120, and the chamfers of the second battery string 112 and the fourth battery string 114 can be oriented toward the central busbar 120.

[0076] Alternatively, the chamfers of the first battery string 111 and the third battery string 113 may be oriented away from the central busbar 120, and the chamfers of the second battery string 112 and the fourth battery string 114 may be oriented away from the central busbar 120.

[0077] In another embodiment, the chamfer of the third battery string 113 may be opposite to that of the first battery string 111. The chamfer of the second battery string 112 may be opposite to that of the fourth battery string 114.

[0078] Alternatively, the chamfer of the first battery string 111 can face the central busbar 120, the chamfer of the third battery string 113 can face away from the central busbar 120, the chamfer of the second battery string 112 can face the central busbar 120, and the chamfer of the fourth battery string 114 can face away from the central busbar 120.

[0079] Alternatively, the chamfer of the first battery string 111 can be oriented away from the central busbar 120, the chamfer of the third battery string 113 can be oriented towards the central busbar 120, the chamfer of the second battery string 112 can be oriented away from the central busbar 120, and the chamfer of the fourth battery string 114 can be oriented towards the central busbar 120.

[0080] This achieves another way of arranging battery strings, which can improve the visual effect of battery string 110, reduce the risk of microcracks and string breakage of battery cells 1011, and further enrich the combination methods of battery string 110.

[0081] In some embodiments, the battery string 110 includes an adjacent first segment 1012 and a second segment 1013, with the first segment 1012 and the second segment 1013 overlapping.

[0082] In the corresponding area where the first segment 1012 and the second segment 1013 overlap, the backlight surface of the first segment 1012 and the light-receiving surface of the second segment 1013 overlap together, so that there is no gap between the first segment 1012 and the second segment 1013.

[0083] In practical applications, an insulating strip is also provided on the backlight surface of the first segment 1012, and the portion of the insulating strip near the edge of the second segment 1013 is attached to the backlight surface of the second segment 1013.

[0084] Of course, in other embodiments, the light-receiving surface of the first segment 1012 and the backlight surface of the second segment 1013 may be at least partially stacked together, and no specific limitation is made here.

[0085] Specifically, the specifications of the first segment 1012 and the second segment 1013 can be the same or different; the structures of the first segment 1012 and the second segment 1013 can be the same or different. No specific limitations are made here regarding the relationship between the first segment 1012 and the second segment 1013.

[0086] In this way, there are no gaps between the solar cells 1011, which allows for better concealment of the solder ribbons. Furthermore, the overlapping arrangement of the solar cells 1011 reduces the space occupied by the battery string 110. In other words, with a fixed size for the battery module 100, more solar cells 1011 can be placed, increasing the power of the battery string 110 and reducing the cost per watt.

[0087] In some embodiments, such as Figure 10 As shown, the overlap width L of the overlapping areas of the first segment 1012 and the second segment 1013 is 0.1mm-1.5mm. In this embodiment, the overlap width can be any value between 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, or 0.1mm-1.5mm, and is not specifically limited here.

[0088] Therefore, setting the overlap width of the corresponding area between the first and second cell segments to between 0.1 and 1.5 mm ensures that the overlap width is within a suitable range. If the overlap width is less than 0.1 mm, the near-zero gap hard contact makes the cell edges stress concentration points. Under the thermal stress of lamination and the mechanical stress during use, the probability of microcracks increases exponentially. If the overlap width is greater than 1.5 mm, it directly reduces the effective surface area of ​​the cell exposed to sunlight, affecting power generation efficiency. Therefore, setting the overlap width between 0.1 and 1.5 mm avoids excessive stress at the cell edges, reducing the risk of microcrack breakage, and also improves power generation efficiency.

[0089] It should be noted that the overlap width of the corresponding overlapping areas of the first and second segments is the same. This uniform overlap width reduces processing complexity, improves production consistency, reduces assembly errors caused by dimensional deviations in the overlap, lowers the scrap rate, and saves costs.

[0090] In the battery string 110, adjacent battery cells 1011 are connected in series by solder strips, and the overlapping areas can be fixedly connected by the solder strips. The solder strips are located on the back side of the battery cell 1011.

[0091] In some embodiments, the battery string 110 includes a solder strip connecting a first segment 1012 and a second segment 1013, wherein the right angle of the first segment 1012 overlaps the chamfer of the second segment 1013 on the side near the solder strip.

[0092] In this way, there is no unsupported area below the chamfered edge of the solar cell 1011, and the cut edge of the solar cell 1011 can effectively support the chamfered edge of the adjacent solar cell 1011. During the lamination process of the solar cell module 100, the corners of the solar cell 1011 are less likely to crack, further reducing the risk of hidden cracks in the solar cell module 100.

[0093] In some embodiments, the battery string 110 includes a solder strip connecting a first segment 1012 and a second segment 1013, wherein the right angle of the first segment 1012 overlaps the chamfer of the second segment 1013 on the side opposite to the solder strip.

[0094] In this way, one right angle can cover another chamfer, which can cover up this microscopic irregularity. From the appearance of the components, the gaps between the 110 battery strings are more uniform and aesthetically pleasing, without any obvious misalignment.

[0095] It is understood that in such embodiments, the battery assembly 100 may further include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back of the solar cells, the photovoltaic glass, and adjacent battery cells 1011. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0096] 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.

[0097] The backsheet can be attached to the encapsulant film on the back of the solar cell. The backsheet 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, aluminum alloy TPT composite encapsulant film, etc., and the specific choice depends on the specific circumstances and is not limited here. 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 battery module 100, providing stable support and installation for the module. For example, the battery module 100 can be installed at the desired location using the metal frame.

[0098] The photovoltaic system of this application embodiment includes the battery module 100 described above.

[0099] 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 for power generation. 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 battery modules 100. For example, multiple battery modules 100 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.

[0100] 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.

[0101] 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 battery assembly, characterized in that, It includes several battery strings, and each battery string includes several battery cells; the battery cells include chamfers, right angles, and battery edges; The battery edge connects the chamfer and the right angle. The chamfers of the battery cells in the same battery string have the same orientation. The chamfer orientation is parallel to the extension direction of the battery edge and points from the right angle to the chamfer. Each battery cell includes at least one chamfer.

2. The battery assembly according to claim 1, characterized in that, The type of the battery cell includes a first segment and a second segment; each of the first segment and the second segment includes at least one chamfer; the grid pattern of the first segment and the second segment is symmetrical about the right-angled side; the right-angled side is the side excluding the chamfer.

3. The battery assembly according to claim 2, characterized in that, Each of the first segments is electrically connected to at least one of the second segments, and each of the second segments is electrically connected to at least one of the first segments.

4. The battery assembly according to claim 1, characterized in that, The number of battery strings is multiple, and the chamfers of the multiple battery strings face the same direction.

5. The battery assembly according to claim 2, characterized in that... For adjacent battery strings, in the vertical direction of the chamfer orientation, every two adjacent segments are of the same type.

6. The battery assembly according to claim 1, characterized in that, The battery assembly includes a central busbar, and the battery string includes a first battery string and a second battery string. The central busbar connects the first battery string and the second battery string in parallel, and the chamfer orientation of the first battery string is opposite to that of the second battery string.

7. The battery assembly according to claim 6, characterized in that, The chamfers of the first and second battery strings are both oriented away from the central busbar.

8. The battery assembly according to claim 6, characterized in that, The chamfers of the first battery string and the second battery string are both oriented towards the central busbar.

9. The battery assembly according to claim 1, characterized in that, The type of the battery cell includes a first segment and a second segment, with the first segment overlapping the second segment.

10. The battery assembly according to claim 9, characterized in that, The overlap width is 0.1mm-1.5mm.

11. The battery assembly according to claim 9, characterized in that, The battery string includes a solder strip that connects the first segment and the second segment, with the right angle of the first segment overlapping the chamfer of the second segment near the side of the solder strip.

12. The battery assembly according to claim 9, characterized in that, The battery string includes a solder strip that connects the first segment and the second segment, wherein the right angle of the first segment overlaps the chamfer of the second segment on the side opposite to the solder strip.

13. A photovoltaic system, characterized in that, The photovoltaic system includes the battery module as described in any one of claims 1-12.

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