Battery assembly and photovoltaic system

Abstract

The utility model provides a battery assembly and a photovoltaic system. The battery assembly comprises a plurality of battery strings which are sequentially arranged in the first direction, each battery string comprises a plurality of battery pieces which are sequentially arranged in the second direction, and the first direction intersects with the second direction; the plurality of battery strings comprise a first battery string, a second battery string and a third battery string which are sequentially arranged along the first direction, and two ends of the second battery string in the first direction are respectively overlapped with the same sides of the first battery string and the third battery string. According to the battery assembly provided by the embodiment of the utility model, the two ends of the second battery string in the first direction are respectively overlapped with the same side of the first battery string and the third battery string, so that the string distance between the adjacent battery strings can be eliminated, and sunlight cannot penetrate out from the interval between the adjacent battery strings; the light absorption rate of the battery assembly can be improved, and the efficiency of the battery assembly is improved.

Description

Technical Field

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

[0002] In a battery module, the individual cell strings are typically spaced apart. Therefore, when the battery module absorbs sunlight, the sunlight passes directly through the gaps between the cell strings, reducing the light absorption rate of the battery module and thus reducing its efficiency. Utility Model Content

[0003] This invention provides a battery module and a photovoltaic system to solve the technical problem of how to design a battery module to improve its light absorption rate, thereby increasing its efficiency.

[0004] This utility model is implemented as follows: It provides a battery module and a photovoltaic system. The battery module includes multiple battery strings arranged sequentially along a first direction, each battery string including multiple battery cells arranged sequentially along a second direction, the first direction intersecting the second direction. The multiple battery strings include a first battery string, a second battery string, and a third battery string arranged sequentially along the first direction, with the two ends of the second battery string overlapping the same side of the first battery string and the third battery string, respectively.

[0005] In this embodiment of the present invention, the battery assembly has the second battery string overlapping with the first and third battery strings on the same side at both ends in the first direction, thereby eliminating the string spacing between adjacent battery strings. This prevents sunlight from passing through the gaps between adjacent battery strings, thus improving the light absorption rate of the battery assembly and consequently increasing its efficiency.

[0006] Furthermore, along the first direction, the width of the overlapping area between the second battery string and the first battery string is 0.1 mm to 3 mm; and / or, the width of the overlapping area between the third battery string and the first battery string is 0.1 mm to 3 mm.

[0007] This invention reduces the pressure exerted by the second battery string on the stacked first and third battery strings by reasonably setting the width range of the overlapping area between the first and second battery strings, and the width range of the overlapping area between the second and third battery strings, thus avoiding excessive pressure that could cause damage to the battery cells or solder strips in the battery strings.

[0008] Furthermore, the battery assembly also includes a first busbar; the first busbar connects from the first battery string to the second battery string.

[0009] Thus, in this embodiment of the present invention, the battery assembly reduces the tilt of the second battery string by having its two ends overlap with the same side of the first and third battery strings in the first direction, thereby reducing the wear of the battery string edges on the first busbar.

[0010] Furthermore, the first battery cell in the first battery string in the second direction is the first battery cell, and the first battery cell in the second battery string in the second direction is the second battery cell; the first busbar connects from the backlight surface of the first battery cell to the backlight surface of the second battery cell.

[0011] In this way, the first busbar can be specifically located on the backlight surface of both the first and second battery strings. Compared to the traditional method of placing the busbar on the outside of the battery strings, this effectively hides the busbar, thereby improving the overall aesthetics of the battery assembly and making it suitable for manufacturing full-screen components. Simultaneously, the first busbar connects the backlight surface of the first battery cell to the backlight surface of the second battery cell. The first battery cell is the first cell in the first battery string in the second direction, and the second battery cell is the first cell in the second battery string in the second direction. The first busbar's location on the first cell in an adjacent battery string shortens the current transmission path between the battery string and the first busbar, reducing contact points and thus lowering conductivity resistance and energy loss, thereby improving the efficiency of the battery assembly.

[0012] Furthermore, the second battery cell in the first battery string in the second direction is the third battery cell, and the second battery cell in the second battery string in the second direction is the fourth battery cell; the first busbar connects from the backlight surface of the third battery cell to the backlight surface of the fourth battery cell.

[0013] In this way, the first busbar can be specifically located on the backlight surface of the first and second battery strings. Compared with the traditional method of placing the busbar on the outside of the battery strings, this can effectively hide the busbar, thereby improving the overall aesthetics of the battery assembly and making it suitable for manufacturing full-screen components. Simultaneously, the first busbar connects the backlight surface of the third battery cell to the backlight surface of the fourth battery cell. The third battery cell is the second battery cell in the second direction of the first battery string, and the fourth battery cell is the second battery cell in the second direction of the second battery string. The first busbar is located on the second battery cell in an adjacent battery string, allowing it to be positioned away from the vulnerable edges of the battery assembly. This reduces stress on the edges of the battery assembly and effectively avoids the risk of microcracks in the battery cells during lamination, preventing damage to the edge cells.

[0014] Further, the first busbar includes a first connecting portion, a conductive portion, and a second connecting portion; the first connecting portion connects to the first battery string; the conductive portion is bent from the first connecting portion and is located between the first connecting portion and the second connecting portion; the second connecting portion is bent from the conductive portion and connects to the second battery string; the first connecting portion includes a first connecting point, which is the last connecting point of the first connecting portion to the first battery string in the first direction; the second connecting portion includes a second connecting point, which is the first connecting point of the second connecting portion to the first connecting point of the second battery string in the first direction; the line connecting the second connecting point and the first connecting point is a connecting line, and the connecting line forms a first angle with the first direction, the first angle being 60° to 90°.

[0015] Therefore, by setting the angle between the connecting line in the first busbar and the first direction to 60° to 90°, the bending shape of the first busbar better conforms to the overlapping shape of the three battery strings, which can reduce the damage to the first busbar caused by the battery strings during lamination. This can improve the service life of the first busbar.

[0016] Furthermore, the projected length of the connecting line on the first battery string is 0mm to 10mm.

[0017] Furthermore, the battery assembly also includes a junction box disposed on the first battery string and / or the second battery string. Thus, by placing the junction box on the first and / or second battery strings, which have a lower base thickness in the battery assembly, the risk of microcracks and fragments in the battery cells can be reduced during battery assembly lamination.

[0018] This utility model embodiment also provides a photovoltaic system, which includes the battery module as described above. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a photovoltaic system module provided in one embodiment of the present invention;

[0021] Figure 2 This is a partial structural schematic diagram of a battery assembly provided in one embodiment of the present invention;

[0022] Figure 3This is a cross-sectional schematic diagram of a portion of the structure of a battery assembly provided in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the battery string in a battery assembly provided in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the arrangement of the first busbar in a battery assembly according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the arrangement of the first busbar in a battery assembly provided in another embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the junction box arrangement in a battery assembly according to an embodiment of the present invention;

[0027] Figure 8 This is a cross-sectional view of a battery assembly with a first busbar provided in another embodiment of the present invention;

[0028] Figure 9 This is a cross-sectional view of a battery assembly with a first busbar provided in another embodiment of the present invention;

[0029] Figure 10 yes Figure 9 A magnified view of a portion of point A in the middle;

[0030] Figure 11 This is a schematic diagram of the structure of a battery assembly provided in one embodiment of the present invention.

[0031] Key component symbols: 1000, Photovoltaic system; 100, Battery module; 1001, Battery string; 101, Battery cell; 20, First battery string; 30, Second battery string; 40, Third battery string; 50, First busbar; 60, Junction box; 51, First connection part; 52, Conductive part; 53, Second connection part; 511, First connection point; 531, Second connection point; 1011, First battery cell; 1012, Second battery cell; 1013, Third battery cell; 1014, Fourth battery cell; L, Connecting line; C, First included angle. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0033] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "top", "bottom", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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 utility model.

[0034] 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model according to the specific circumstances.

[0036] 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.

[0037] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present 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 scope of 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; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0038] Please see Figure 1 The photovoltaic system 1000 in this embodiment of the present invention may include the battery module 100, which may include a plurality of battery cells 101. These battery cells 101 may be connected in series with solder strips to form a battery string 1001. The battery strings 1001 in the battery module 100 may be connected in series, in parallel, or in a series-parallel combination to achieve current collection and output. For example, busbars may be used to connect the battery strings 1001.

[0039] The accompanying drawings provided in this application are schematic diagrams, and some elements are not shown in the drawings. The purpose is to clearly describe the technical solution and highlight the key features of the utility model. It is not intended to limit the technical solution to exclude these unshown elements. That is to say, the drawings are merely examples and do not represent a limitation on the specific form of the battery module 100.

[0040] like Figures 2 to 11 As shown, the battery assembly 100 in this embodiment of the present invention includes: a plurality of battery strings 1001 arranged sequentially along a first direction, the battery strings 1001 including a plurality of battery cells 101 arranged sequentially along a second direction, the first direction and the second direction intersecting; the plurality of battery strings 1001 include a first battery string 20, a second battery string 30 and a third battery string 40 arranged sequentially along the first direction, the two ends of the second battery string 30 overlapping the same side of the first battery string 20 and the third battery string 40 respectively in the first direction.

[0041] Thus, in the embodiment of this utility model, the applicant sets the two ends of the second battery string 30 to overlap with the same side of the first battery string 20 and the third battery string 40 in the first direction, thereby eliminating the string spacing between adjacent battery strings 1001, so that sunlight cannot pass through the gap between adjacent battery strings 1001, thereby improving the light absorption rate of the battery assembly 100 and thus improving the efficiency of the battery assembly 100.

[0042] like Figure 2 and Figure 3 As shown, the two ends of the second battery string 30 overlap with the same side of the first battery string 20 and the third battery string 40 in the first direction, respectively, reducing the tilt of the second battery string 30 and making the first battery string 20, the second battery string 30, and the third battery string 40 arranged in a "triangular" structure. This ensures that the battery string 1001 in the battery assembly 100 remains horizontal rather than tilted in its natural state. This also reduces the risk of microcracks in the battery cells 101 of the battery string 1001 during lamination.

[0043] It is understood that the two ends of the second battery string 30 in the first direction overlap with the same side of the first battery string 20 and the third battery string 40, respectively. This means that after the first battery string 20, the second battery string 30, and the third battery string 40 are arranged to overlap, the second battery string 30 overlaps with the side of the first battery string 20 facing the first battery string 30, and the second battery string 30 overlaps with the side of the third battery string 40 facing the first battery string 30. This ensures that the first battery string 20 and the third battery string 40 are spaced apart along the first direction, and the second battery string 30 is stacked on top of the first battery string 20 and the third battery string 40. The first battery string 20 and the third battery string 40 respectively support one end of the second battery string 30, which makes the arrangement structure of each battery string 1001 more stable and improves the mechanical stability of the battery assembly 100.

[0044] like Figure 11 As shown, it is worth noting that the battery assembly 100 may have one or more triangular structures. In a battery assembly 100 that includes multiple triangular structures, the battery string 1001 may specifically be a first battery string 20 in one triangular structure, and may also be a third battery string 40 or a second battery string 30 in other triangular structures.

[0045] In actual arrangement, when the battery assembly 100 includes multiple battery strings 1001, the multiple battery strings 1001 can be arranged in a triangular structure, either partially or entirely. When the multiple battery strings 1001 are arranged in a triangular structure, the triangular structure can be combined with other arrangements to connect the multiple battery strings 1001. For example, the first third of the battery strings 1001 can be arranged in a triangular structure, the middle battery strings 1001 can be arranged in a flat structure (i.e., there are gaps between the battery strings 1001), and the remaining battery strings 1001 can be arranged in a triangular structure.

[0046] In some embodiments, the battery strings 1001 can be arranged in various combinations, and this invention does not limit this. Combining multiple battery strings 1001 with various arrangements can optimize the layout of the battery strings 1001 and improve module packaging efficiency. This allows more battery strings 1001 to be placed within the same module area compared to conventional arrangements. It also offers advantages such as higher output power, lower internal losses, and less hot spot effect.

[0047] In addition, such as Figure 4 As shown, in each battery string 1001, each battery string 1001 includes a plurality of battery cells 101 arranged sequentially along the second direction, with adjacent battery cells 101 partially overlapping. Thus, the partial overlap of adjacent battery strings 1001 can be eliminated, thereby reducing the inter-cell spacing between the battery cells 101 in the battery string 1001, further improving the light absorption rate and efficiency of the battery assembly 100.

[0048] Of course, in other embodiments, the battery cells 101 in each battery string 1001 may also be spaced apart.

[0049] In some embodiments, the solar cell 101 in this invention can be a complete solar cell 101, a half solar cell 101, or multiple solar cells 101, etc., and there is no limitation herein. A half solar cell 101 or multiple solar cells 101 is manufactured by cutting a single solar cell 101 along one of its lines. The number of half solar cells, three-section solar cells, or multiple solar cells can be multiple and arranged in an array.

[0050] like Figure 2 As shown, in one possible implementation, the width of the overlapping area between the first battery string 20 and the second battery string 30 along the first direction is 0.1 mm to 3 mm; and / or, the width D2 of the overlapping area between the second battery string 30 and the third battery string 40 along the first direction is 0.1 mm to 3 mm.

[0051] In this way, the first battery string 20 can support the second battery string 30 while minimizing shading of the first battery string 20. This is because if the overlap area between the first battery string 20 and the second battery string 30 is too small, the first battery string 20 will not have enough space to support the second battery string 30; conversely, if the overlap area is too large, the second battery string 30 will significantly obstruct the first battery string 20, affecting its power generation efficiency.

[0052] Furthermore, this design allows the third battery string 40 to support the second battery string 30 while minimizing shading of the second battery string 30. This is because if the overlap area D2 between the third battery string 40 and the second battery string 30 is too small, the third battery string 40 will lack sufficient space to support the second battery string 30; conversely, if the overlap area D2 is too large, the second battery string 30 will significantly obstruct the third battery string 40, affecting its power generation efficiency.

[0053] Specifically, along the first direction, the width of the overlapping area between the first battery string 20 and the second battery string 30 is 0.1 mm to 3 mm; for example, 0.1 mm, 1 mm, 1.5 mm, 2 mm, or 3 mm. Along the first direction, the width D2 of the overlapping area between the second battery string 30 and the third battery string 40 is 0.1 mm to 3 mm; for example, 0.1 mm, 1 mm, 1.5 mm, 2 mm, or 3 mm.

[0054] Therefore, by reasonably setting the width range of the overlapping area between the first battery string 20 and the second battery string 30, and the width range of the overlapping area between the second battery string 30 and the third battery string 40, this utility model can reduce the pressure of the second battery string 30 on the stacked first battery string 20 and third battery string 40, and avoid excessive pressure causing damage to the battery cells 101 or the solder strips in the battery string 1001.

[0055] like Figure 2 As shown, in one possible implementation, the ratio of the area of ​​the overlap region between the first battery string 20 and the second battery string 30 and the area of ​​the overlap region between the second battery string 30 and the third battery string 40 is 0.95 to 1.05. This makes the areas of the overlap regions of the first battery string 20 and the third battery string 40 with the second battery string 30 roughly equivalent, thus evenly distributing the weight of the second battery string 30, avoiding localized stress concentration problems, and improving the stability of the battery assembly 100.

[0056] Preferably, the ratio of the area of ​​the overlap region between the first battery string 20 and the second battery string 30 to the area of ​​the overlap region between the second battery string 30 and the third battery string 40 can be 1. In this way, the areas of the overlap region between the first battery string 20 and the second battery string 30 and the area of ​​the second battery string 30 and the third battery string 40 are the same, and the first battery string 20 and the third battery string 40 have the best stress-dispersing effect on the second battery string 30.

[0057] like Figure 5 and Figure 6As shown, it can be understood that the battery assembly 100 also includes a first busbar 50; the first busbar 50 connects to the second battery string 30 from the first battery string 20. Thus, in this embodiment of the present invention, the applicant reduces the tilt of the second battery string 30 by setting the two ends of the second battery string 30 to overlap with the same side of the first battery string 20 and the third battery string 40 in the first direction, thereby reducing the wear of the edge of the battery string 1001 on the first busbar 50.

[0058] It is understandable that the overlapping method of adjacent battery strings 1001 in the related technology will cause the battery strings 1001 to be set at an angle. The edge of the battery cell 101 in the angled battery string 1001 will exert additional mechanical pressure on the busbar, causing wear on the busbar and a shorter service life.

[0059] In the battery assembly 100 of this utility model embodiment, the battery cells 101 of each battery string 1001 can remain horizontal during lamination, which reduces the wear of the edges of the battery cells 101 on the first busbar 50.

[0060] Specifically, the battery assembly 100 further includes a first busbar 50 connecting the first battery string 20 and the second battery string 30. The first busbar 50 can be an end busbar in the battery assembly 100 to realize the series connection of the first battery string 20 and the second battery string 30. The first busbar 50 can also be an intermediate busbar in the battery assembly 100 to realize the parallel connection of adjacent battery strings 1001 in a second direction.

[0061] like Figure 5As shown, further, the first battery cell 101 of the first battery string 20 in the second direction is the first battery cell 1011, and the first battery cell 101 of the second battery string 30 in the second direction is the second battery cell 1012; the first busbar 50 connects from the backlight surface of the first battery cell 1011 to the backlight surface of the second battery cell 1012. Thus, the first busbar 50 can be specifically located on the backlight surfaces of the first battery string 20 and the second battery string 30. Compared to the traditional method of placing the busbar on the outside of the battery string 1001, this effectively hides the busbar, thereby improving the overall aesthetics of the battery assembly 100 and making it suitable for manufacturing full-screen components. Meanwhile, the first busbar 50 connects from the backlight surface of the first battery cell 1011 to the backlight surface of the second battery cell 1012. The first battery cell 1011 is the first battery cell 101 of the first battery string 20 in the second direction, and the second battery cell 1012 is the first battery cell 101 of the second battery string 30 in the second direction. The first busbar 50 is located at the first battery string 1001 in the adjacent battery string 1001, which can shorten the current transmission path between the battery string 1001 and the first busbar 50, reduce contact points, thereby reducing conductivity resistance and energy loss, and improving the efficiency of the battery assembly 100.

[0062] like Figure 6 As shown, further, the second battery cell 101 of the first battery string 20 in the second direction is the third battery cell 1013, and the second battery cell 101 of the second battery string 30 in the second direction is the fourth battery cell 1014; the first busbar 50 connects from the backlight surface of the third battery cell 1013 to the backlight surface of the fourth battery cell 1014. Thus, the first busbar 50 can be specifically located on the backlight surface of the first battery string 20 and the second battery string 30. Compared to the traditional method of placing the busbar on the outside of the battery string 1001, this effectively hides the busbar, thereby improving the overall aesthetics of the battery assembly 100 and making it suitable for manufacturing full-screen components. Meanwhile, by setting a first busbar 50 to connect the backlight surface of the third battery cell 1013 to the backlight surface of the fourth battery cell 1014, the applicant can reduce the stress on the edge of the battery assembly 100 and effectively avoid the risk of microcracks in the battery cells 101 caused by crushing the battery cells 101 at the edge of the battery assembly 100 during lamination.

[0063] The first busbar 50 described above can be an end busbar. The first battery cell 1011 is located at the end of the first battery string 20. For ease of explanation, in this embodiment, the end where the first battery cell 1011 is located is referred to as the head end of the battery string 1001. That is, in the second direction, the first battery cell 1011 is the first battery cell 101 of the first battery string 20, and the third battery cell 1013 is the second battery cell 101 of the first battery string 20. It is easy to understand that the end where the first battery cell 1011 is located can also be referred to as the tail end of the battery string 1001, which will not be elaborated here. Similarly, the second battery cell 1012 is located at the end of the second battery string 30. For ease of explanation, in this embodiment, the end where the second battery cell 1012 is located is referred to as the head end of the battery string 1001. That is, in the second direction, the second battery cell 1012 is the first battery cell 101 of the second battery string 30, and the fourth battery cell 1014 is the second battery cell 101 of the second battery string 30. It is not difficult to understand that the end where the second battery cell 1012 is located can also be referred to as the end of the battery string 1001, which will not be elaborated here.

[0064] In the same battery string 1001, adjacent battery cells 101 can be connected in series by means of soldering ribbon, conductive adhesive, etc.

[0065] In one embodiment, adjacent battery cells 101 are connected by series solder strips. The specific connection method can refer to the existing method and will not be described in detail here.

[0066] In some embodiments, when multiple battery strings 1001 are arranged along the first direction, the multiple battery strings 1001 may be arranged in a triangular shape or partially in a triangular shape. In this case, multiple first busbars 50 need to be set to connect the multiple battery strings 1001.

[0067] Specifically, such as Figure 11 As shown, the first busbar 50 can be specifically disposed near the end of the battery string 1001 in the first direction, serving as the end busbar of the battery string 1001, thereby enabling the series connection of two adjacent battery strings 1001 in the first direction. By disposing of multiple first busbars 50, multiple battery strings 1001 can be connected in series.

[0068] Specifically, such as Figure 11 As shown, the first busbar 50 can be specifically positioned near the middle of the battery string 1001 in the first direction, serving as the intermediate busbar for the battery string 1001, thereby enabling parallel connection of two adjacent battery strings 1001 in the second direction. By setting multiple first busbars 50, multiple sets of battery strings 1001 can be connected in parallel.

[0069] In some embodiments, when multiple battery strings 1001 are arranged in a triangular pattern, adjacent battery strings are connected by a first busbar 50. For example, multiple battery strings are arranged sequentially along a first direction, namely a first battery string 20, a second battery string 30, a third battery string 30, a fourth battery string (not shown), etc. When the first first busbar 50 serves as an end busbar, it can realize the series connection of adjacent first battery strings 20 and second battery strings 30 in the first direction. When the second first busbar 50 serves as an end busbar, it can realize the series connection of adjacent third battery strings 30 and fourth battery strings in the first direction. And so on. When multiple battery strings 1001 are provided, the arrangement of the end busbars is the same as the example above.

[0070] When the first busbar 50 serves as an intermediate busbar in the battery string 1001, it enables parallel connection of adjacent first battery strings 20 and second battery strings 30 in the first direction. Similarly, when the second busbar 50 serves as an intermediate busbar, it enables parallel connection of adjacent third and fourth battery strings 30 in the first direction. This pattern continues, and the arrangement of the end busbars follows the example described above when multiple battery strings 1001 are used. Based on actual needs, an appropriate number of end busbars and intermediate busbars can be used to connect multiple battery strings 1001 in series and parallel.

[0071] like Figure 8 , Figure 9 and Figure 10 As shown, in one possible implementation, the first busbar 50 includes a first connecting portion 51, a conductive portion 52, and a second connecting portion 53; the first connecting portion 51 connects to the first battery string 20; the conductive portion 52 is bent from the first connecting portion 51 and is located between the first connecting portion 51 and the second connecting portion 53; the second connecting portion 53 is bent from the conductive portion 52 and connects to the second battery string 30; the first connecting portion 51 includes a first connecting point 511, which is the last connecting point of the first connecting portion 51 to the first battery string 20 in a first direction; the second connecting portion 53 includes a second connecting point 531, which is the first connecting point of the second connecting portion 53 to the first connecting point of the second battery string 30 in the first direction; the line connecting the second connecting point 531 and the first connecting point 511 is a connecting line L, which forms a first angle C with the first direction, and the first angle C is 60° to 90°. Thus, by setting the angle between the connecting line L in the first busbar 50 and the first direction to 60° to 90°, the applicant can make the bending shape of the first busbar 50 more closely match the overlapping shape of the three battery strings 1001, thereby reducing the damage to the first busbar 50 caused by the battery strings 1001 during lamination. This can improve the service life of the first busbar 50.

[0072] Furthermore, such as Figure 8 , Figure 9 and Figure 10 As shown, the first busbar 50 connects the first battery string 20 and the second battery string 30 respectively, making the first battery string 20 and the second battery string 30 electrically connected. The first connection part 51 is specifically located on the side of the first battery string 20 facing the second battery string 30, and the second connection part 53 is specifically located on the side of the second battery string 30 away from the first battery string 20. The conductive part 52 is connected to the first connection part 51 and the second connection part 53 respectively.

[0073] It is worth noting that the first connecting part 51 has multiple connection points with the first battery string 20 in the first direction, and the first connection point 511 is the last connection point. The second connecting part 53 has multiple connection points with the second battery string 30 in the first direction, and the second connection point 531 is the first connection point.

[0074] Furthermore, in order to conform to the overlapping shape of the three battery strings 1001, the bending shape of the first busbar 50 needs to be adjusted accordingly to reduce wear on the first busbar 50 during the lamination of the battery assembly 100. Therefore, the applicant can adjust the bending shape of the first busbar 50 by adjusting the first included angle C.

[0075] Specifically, setting the first included angle C to 60° to 90° allows the bending shape of the first busbar 50 to better conform to the overlapping shape of the three battery strings 1001, thereby reducing damage to the first busbar 50 during the lamination of the battery assembly 100. For example, the first included angle C can be 60°, 63°, 65°, 68°, 70°, 75°, 80°, 87.5°, 88°, 88.5°, 89.5°, or 90°.

[0076] Preferably, such as Figure 4 As shown, the first included angle C can be set to 90°. This makes the bending shape of the first busbar 50 best fit the overlapping shape of the three battery strings 1001.

[0077] Furthermore, the projected length of the connecting line L on the first battery string 20 is 0mm to 10mm. For example, it is 0mm, 0.5mm, 1mm, 2mm, 3mm, 5mm, 8mm, or 10mm. This allows the bending shape of the first busbar 50 to better conform to the overlapping shape of the three battery strings 1001, reducing the damage to the first busbar 50 caused by the lamination of the battery assembly 100.

[0078] like Figure 7As shown, in one possible implementation, the battery assembly 100 further includes a junction box 60, which is disposed on the first battery string 20 and / or the second battery string 30. It is understood that in the battery assembly 100 of this embodiment, the first battery string 20 and the third battery string 40 respectively support one end of the second battery string 30, resulting in a relatively large thickness at the second battery string 30 in the battery assembly 100. Distributing the junction box 60 on the second battery string 30 would make the battery assembly 100 too thick, increasing the risk of microcracks and fragments in the battery cells 101 during lamination. Therefore, distributing the junction box 60 on the first battery string 20 and / or the second battery string 30, where the thickness is lower, can reduce the risk of microcracks and fragments in the battery cells 101 during lamination of the battery assembly 100.

[0079] The first busbar 50 in this invention can be made of tin-plated copper strip, aluminum strip, or silver strip, etc. The first busbar 50 can be made of high-purity copper as the base material, with a tin layer coated on its surface. This prevents the copper base material from oxidizing and discoloring, and also facilitates the soldering of the material to the battery string 1001.

[0080] Specifically, in this embodiment of the invention, the type of the first busbar 50 is not limited to meet different needs. For example, the first busbar 50 can be a round busbar or a flat, wide busbar.

[0081] In some embodiments, the cross-sectional shape of the first busbar 50 is circular, rectangular, or triangular, etc. In practical applications, the cross-sectional shape of the first busbar 50 can be flexibly selected according to process requirements and the performance requirements of the battery cell 101.

[0082] It is understood that the battery assembly 100 in such an embodiment may also include a frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled in the front and back of the battery cells 101 and between the photovoltaic glass, adjacent battery cells 101, etc. 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.

[0083] Photovoltaic glass can be applied to the encapsulating film on the front side of the solar cell 101. 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 101 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell 101 together, providing sealing, insulation, and waterproofing / moisture protection for the solar cell 101.

[0084] The backsheet can be attached to the adhesive film on the back of the solar cell 101. The backsheet protects and supports the solar cell 101, and has reliable insulation, water resistance, and aging resistance. Multiple options are available for the backsheet, typically tempered glass, acrylic glass, aluminum alloy TPT composite adhesive film, etc., and the specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell 101, adhesive film, and photovoltaic glass can be integrated into a frame. The frame serves as the main external support structure for the entire solar module 100, providing stable support and installation for the solar module 100. For example, the solar module 100 can be installed at the desired location via the frame.

[0085] 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.

[0086] Furthermore, the above description is merely a preferred embodiment of this application and is 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 protection scope of this application.

Claims

1. A battery assembly, characterized in that, It includes multiple battery strings arranged sequentially along a first direction, and each battery string includes multiple battery cells arranged sequentially along a second direction, wherein the first direction and the second direction intersect. The plurality of battery strings include a first battery string, a second battery string, and a third battery string arranged sequentially along the first direction, wherein the two ends of the second battery string overlap with the same side of the first battery string and the third battery string, respectively, in the first direction.

2. The battery assembly according to claim 1, characterized in that, Along the first direction, the width of the overlap area between the second battery string and the first battery string is 0.1 mm to 3 mm; And / or, the width of the overlapping area between the third battery string and the first battery string is 0.1 mm to 3 mm.

3. The battery assembly according to claim 1, characterized in that, It also includes a first busbar; the first busbar connects from the first battery string to the second battery string.

4. The battery assembly according to claim 3, characterized in that, The first battery cell in the first battery string in the second direction is the first battery cell, and the first battery cell in the second battery string in the second direction is the second battery cell; the first busbar connects from the backlight surface of the first battery cell to the backlight surface of the second battery cell.

5. The battery assembly according to claim 3, characterized in that, The second battery cell in the first battery string in the second direction is the third battery cell, and the second battery cell in the second battery string in the second direction is the fourth battery cell; the first busbar connects from the backlight surface of the third battery cell to the backlight surface of the fourth battery cell.

6. The battery assembly according to claim 3, characterized in that, The first busbar includes a first connecting portion, a conductive portion, and a second connecting portion; The first connecting portion is connected to the first battery string; the conductive portion is bent from the first connecting portion and is located between the first connecting portion and the second connecting portion; The second connecting portion is bent from the conductive portion and connected to the second battery string; The first connecting part includes a first connecting point, which is the last connecting point of the first connecting part to the first battery string in the first direction; The second connecting part includes a second connecting point, which is the first connecting point of the second connecting part to the first end of the second battery string in the first direction; The line connecting the second connection point and the first connection point is a connecting line, and the connecting line forms a first angle with the first direction, the first angle being 60° to 90°.

7. The battery assembly according to claim 6, characterized in that, The projected length of the connecting line on the first battery string is 0mm to 10mm.

8. The battery assembly according to claim 1, characterized in that, It also includes a junction box, which is disposed on the first battery string and / or the second battery string.

9. The battery assembly according to claim 1, characterized in that, The battery string includes a plurality of battery cells arranged sequentially along a second direction, with adjacent battery cells partially overlapping.

10. A photovoltaic system, characterized in that, Includes the battery assembly as described in any one of claims 1 to 9.

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