Battery assembly and photovoltaic system

Abstract

The utility model relates to the field of photovoltaic technology. The utility model provides a battery assembly and a photovoltaic system. Comprising a first battery piece, a second battery piece and a supporting piece, the first battery piece and the second battery piece are overlapped, an overlapping area and a non-overlapping area are formed in the edge area of the second battery piece, the overlapping area is supported by the first battery piece, the non-overlapping area is located at the corner of the second battery piece, and the supporting piece is located at the corner of the second battery piece. And the supporting piece is positioned on the outer side of the first battery piece and is used for supporting the non-overlapping area. The first battery piece is used for supporting the overlapping area in the edge area of the second battery piece, and the supporting piece is used for supporting the non-overlapping area at the corner part of the second battery piece, so that the risk that the corner part of the second battery piece sinks during lamination can be reduced, the risk of subfissure and fragment is reduced, and the service life of the battery assembly can be prolonged.

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] When solar cells are arranged in a stacked manner, different overlapping methods can lead to non-overlapping areas at the edges of the cells. These non-overlapping areas pose a risk of breakage during module encapsulation. Therefore, reducing the risk of microcracks and breakage in the cells, and improving the yield and lifespan of solar modules, has become an urgent problem to be solved. Utility Model Content

[0003] This invention provides a battery module and a photovoltaic system to address how to reduce the risk of microcracks and fragmentation in battery cells, and improve the process yield and lifespan of battery modules.

[0004] This utility model is implemented as follows: It provides a battery module and a photovoltaic system. The module includes a first battery cell, a second battery cell, and a support member. The first and second battery cells overlap, forming an overlapping area and a non-overlapping area at the edge of the second battery cell. The overlapping area is supported by the first battery cell, and the non-overlapping area is located at a corner of the second battery cell. The support member is located outside the first battery cell and supports the non-overlapping area.

[0005] In this invention, the battery module utilizes the first battery cell to support the overlapping area at the edge of the second battery cell and uses a support member to support the non-overlapping area at the corner of the second battery cell. This reduces the risk of corner sinking of the second battery cell during lamination, thereby reducing the risk of microcracks and fragmentation, and thus improving the process yield and service life of the battery module.

[0006] Furthermore, the ratio of the area of ​​the support surface of the support member to the area of ​​the non-overlapping area is 0.1 to 1.

[0007] Furthermore, along the first direction, the ratio of the height of the support member to the height of the first battery cell is 0.5 to 15.

[0008] Furthermore, the support member is an insulating member.

[0009] This invention effectively avoids current leakage or short circuits caused by the support component and the battery by setting the support component as an insulating component, thereby improving the safety and stability of the battery assembly.

[0010] Furthermore, the elastic modulus of the support member is from 0.01 MPa to 10 MPa.

[0011] This invention sets the elastic modulus of the support component to between 0.01 MPa and 10 MPa, giving the support component a certain degree of flexibility and elasticity. During lamination, the support component can act as a buffer, reducing the force exerted by the support component on the solar cells, thereby reducing damage or deformation of the solar cells.

[0012] Furthermore, the support member includes at least one of insulating adhesive, gasket, and foam.

[0013] Furthermore, the supporting surface of the support member is an arc surface.

[0014] This invention reduces the contact area between the support member and the second battery cell by setting the support surface of the support member to an arc surface when the support member supports the second battery cell, thereby reducing mechanical damage to the second battery cell.

[0015] Furthermore, the support member is detachably or fixedly connected to the first battery cell. This makes the support member more stable and reduces the risk of it shifting.

[0016] Furthermore, the support member is spaced apart from the first battery cell. This avoids direct contact between the support member and the first battery cell, preventing wear and tear and reducing mechanical damage to the first battery cell. It also improves the mechanical stability of the first support member.

[0017] Furthermore, at least one of the first and second battery cells is a multi-cell battery cell that has been cut.

[0018] Furthermore, at least one of the first and second battery cells is a cut half-cell battery cell.

[0019] Furthermore, the first battery cell includes at least one chamfer in the edge region near the overlapping area, and the second battery cell includes at least one right angle in the edge region near the overlapping area; when the first battery cell and the second battery cell overlap, the right angle of the second battery cell is placed on the chamfer of the first battery cell.

[0020] Furthermore, the support member is located within the gap formed by the right angle and the first battery cell.

[0021] Furthermore, the support member is at least one of the following shapes: triangular, square, circular, and elliptical.

[0022] Furthermore, the ratio of the thickness of the support member to the height of the first battery cell is 0.5 to 1.5.

[0023] This utility model embodiment also provides a photovoltaic system, which includes a plurality of battery modules as described above. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of a photovoltaic system module provided in one embodiment of the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of a battery assembly provided in one embodiment of the present invention;

[0027] Figure 3 yes Figure 2 A partial structural diagram of the first battery cell in the battery assembly shown;

[0028] Figure 4 yes Figure 2 A partial structural diagram of the second battery cell in the battery assembly shown;

[0029] Figure 5 yes Figure 2 A partially enlarged schematic diagram of point A in the battery assembly shown;

[0030] Figure 6 This is a schematic diagram of another part of the structure of the battery assembly provided in one embodiment of the present invention;

[0031] Figure 7 This is a partial cross-sectional structural diagram of a battery assembly provided in one embodiment of the present invention;

[0032] Figure 8 This is a top view of a support member in a battery assembly provided in one embodiment of the present invention.

[0033] Explanation of key component symbols: 1000, photovoltaic system; 100, battery module; 10, first battery cell; 20, second battery cell; 30, support member; 11, first chamfer; 21, edge region; 22, first right angle; 211, overlapping area; 212, non-overlapping area; 31, opening. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Please see Figure 1 The photovoltaic system 1000 in this embodiment of the present invention may include the battery module 100. The battery module 100 may include a plurality of battery cells, which can be connected in series with solder strips to form a battery string. The battery strings in the battery module 100 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 battery strings can be achieved through busbars.

[0041] 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.

[0042] like Figures 2 to 8 As shown, in this embodiment of the present invention, the battery assembly 100 includes: a first battery cell 10, a second battery cell 20, and a support member 30. The first battery cell 10 and the second battery cell 20 overlap, forming an overlapping area 211 and a non-overlapping area 212 in the edge region 21 of the second battery cell 20. The overlapping area 211 is supported by the first battery cell 10, and the non-overlapping area 212 is located at the corner of the second battery cell 20. The support member 30 is located on the outside of the first battery cell 10 and is used to support the non-overlapping area 212.

[0043] Thus, in this embodiment of the present invention, the battery assembly 100 utilizes the first battery cell 10 to support the overlapping area 211 in the edge region 21 of the second battery cell 20, and utilizes the support member 30 to support the non-overlapping area 212 located at the corner of the second battery cell 20. Therefore, the risk of the corner of the second battery cell 20 sinking during lamination can be reduced, thereby reducing the risk of microcracks and fragmentation, and thus improving the service life of the battery assembly 100.

[0044] Specifically, the battery assembly 100 may have one or more overlapping structures of first battery cells 10 and second battery cells 20. The first battery cells 10 and second battery cells 20 partially overlap, specifically, the edge of one side of the first battery cell 10 overlaps with the edge of the other side of the second battery cell 20.

[0045] In some embodiments, at least one of the first battery cell 10 and the second battery cell 20 in this invention can be a complete battery cell or a cut battery cell. For example, both the first battery cell 10 and the second battery cell 20 can be cut battery cells, such as half-cell battery cells or multi-cell battery cells. When both the first battery cell 10 and the second battery cell 20 are cut half-cell battery cells, the multiple half-cell battery cells can be arranged in a stacked structure (i.e., multiple battery cells are stacked).

[0046] like Figure 2 As shown, Figure 2 As an example of a stacked structure of two battery cells, the battery assembly 100 of this invention may also include multiple battery cells, which are stacked sequentially to form a battery string. In some embodiments, due to differences in battery cell manufacturing processes, chamfers (bevels) are formed at the four corners of the battery cell. In actual production, all four corners of the battery cell may be chamfered, or one or more corners may be chamfered. For example, all four corners of the battery cell may be chamfered when the battery cell is cut into two half-cells.

[0047] like Figures 2 to 4 As shown, in some embodiments, both the first battery cell 10 and the second battery cell 20 are half-cell batteries. The first battery cell 10 includes at least one first chamfer 11, which is the corner of the first battery cell 10 near the overlapping area 211; the second battery cell 20 includes at least one first right angle 22, which is the corner of the second battery cell 20 near the overlapping area 211. When the first battery cell 10 and the second battery cell 20 overlap, the first right angle 22 of the second battery cell 20 rests on the first chamfer 11 of the first battery cell 10.

[0048] Specifically, the two corners of the first battery cell 10 near the edge region 21 are uniformly chamfered, i.e., the first chamfered angle 11, while the two corners away from the edge region 21 are right angles. The two corners of the second battery cell 20 near the edge region 21 are uniformly right angles, i.e., the first right angle 22, while the two corners away from the edge region 21 are chamfered. Due to different battery cell manufacturing processes, the first battery cell 10 or the second battery cell 20 may have one or more chamfered angles, and this utility model does not limit this. That is, the first battery cell 10 includes at least one chamfered angle on the side near the overlapping region 211, and the second battery cell 20 includes at least one right angle on the side near the overlapping region 211. When the first battery cell 10 and the second battery cell 20 overlap, the first right angle 22 of the second battery cell 20 rests on the first chamfered angle 11 of the first battery cell 10.

[0049] like Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, in some embodiments, when placing the support 30, the support 30 can be placed in the gap formed by the right angle of the second battery cell 20 near the edge region 21 of the overlapping region 211 and the first battery cell 10.

[0050] The ratio of the thickness of the support member 30 to the height of the first battery cell 10 is 0.5 to 1.5. For example, it is 0.5, 0.6, 0.8, 1, 1.2, or 1.5.

[0051] Furthermore, the shape of the support member 30 can be set to at least one of triangle, square, circle, and ellipse.

[0052] The first battery cell 10 and the second battery cell 20 form an overlapping area 211 and a non-overlapping area 212 in the edge region 21 of the second battery cell 20. Similarly, the first battery cell 10 and the second battery cell 20 also form an overlapping area 211 and a non-overlapping area 212 in the edge region 21 of the first battery cell 10.

[0053] It is worth noting that "overlapping area 211" refers to the portion of the first solar cell 10 and the second solar cell 20 that overlaps when they are stacked. The portion of the second solar cell 20 located in the overlapping area 211 can be supported by the first solar cell 10. During lamination, the first solar cell 10 can provide support for the portion of the second solar cell 20 located in the overlapping area 211.

[0054] It is worth noting that "non-overlapping area 212" refers to the portion of the first solar cell 10 and the second solar cell 20 that does not overlap when they are overlapped. The portion of the second solar cell 20 located in the non-overlapping area 212 cannot be supported by the first solar cell 10. During lamination, the first solar cell 10 cannot provide support for the portion of the second solar cell 20 located in the overlapping area 211.

[0055] Meanwhile, the non-overlapping area 212 is located at the corner of the second battery cell 20. The corner of the second battery cell 20 refers to the portion enclosed by the edge of the second battery cell 20. The corner of the second battery cell 20 can be a right angle structure; of course, the corner of the second battery cell 20 can also be a chamfered structure; or; of course, the corner of the second battery cell 20 can also be an arc-shaped structure. In this embodiment of the present invention, the corner of the second battery cell 20 is not supported by the first battery cell 10.

[0056] like Figures 2 to 8 As shown, the battery assembly 100 of this invention further includes a support member 30, which is specifically located on the outer side of the first battery cell 10. The support member 30 is specifically covered by the non-overlapping area 212, providing support to the non-overlapping area 212 during lamination. The support member 30 ensures effective support and uplift of the non-overlapping area 212 at the corner of the second battery cell 20 during lamination of the battery assembly 100, preventing the non-overlapping area 212 at the corner of the second battery cell 20 from sinking during lamination, thereby reducing the risk of microcracks and fragmentation of the battery cell and ultimately improving the service life of the battery assembly 100.

[0057] like Figure 3 The diagram illustrates the configuration of the support member 30. In one possible implementation, the support member 30 is detachably or fixedly connected to the first battery cell 10. Connecting the support member 30 to the first battery cell 10 makes the support member 30 more stable and reduces the risk of misalignment.

[0058] When connecting the support member 30 to the first battery cell 10, the connection method can be threaded connection, welding connection, tenon and mortise connection, adhesive connection, locking connection, elastic connection, etc. Alternatively, a limiting structure can be provided on the first battery cell 10 to limit the position of the support member 30. These connection methods ensure that the support member 30 is stably positioned within the battery assembly 100.

[0059] The support member 30 can be specifically configured to connect to the outer wall of the corner of the first battery cell 10. This further limits the positioning of the support member 30 and reduces the difficulty of its configuration. Furthermore, when the support member 30 is connected to the first battery cell 10, it can be welded to the first battery cell 10, or it can be bonded to the first battery cell 10. In other embodiments, the support member 30 can also be integrally formed with the first battery cell 10.

[0060] like Figure 2 and Figure 5 As shown, specifically, in one possible implementation, the support member 30 is spaced apart from the first battery cell 10. For example, the support member 30 may be spaced apart from the first battery cell 10 at a preset distance.

[0061] like Figure 2 and Figure 5 As shown, the overlap dimension of the first battery cell 10 and the second battery cell in the first direction of 20 is D, the angle between the first chamfer 11 and the second direction is θ, and the distance L between the support member 30 and the first battery cell 10 satisfies the following relationship: 0<L≤D·cosθ.

[0062] This avoids direct contact between the support member 30 and the first battery cell 10, preventing wear caused by the support member 30 and reducing mechanical damage to the first battery cell 10. It also improves the mechanical stability of the first battery cell 10.

[0063] In one possible implementation, the support member 30 is an insulating component. This effectively prevents current leakage or short circuits caused by contact between the support member 30 and the battery cells, thereby improving the safety and stability of the battery assembly 100.

[0064] In one possible implementation, the support member 30 includes at least one of insulating adhesive, gasket, foam, and rubber. When the support member 30 includes insulating adhesive, the insulating adhesive has excellent electrical insulation properties, which can improve the electrical insulation of the support member 30 and effectively prevent conductive contact between the battery cell and the support member 30. For example, the insulating adhesive can specifically be UV adhesive, epoxy resin, silicone, etc.

[0065] When the support member 30 includes a gasket, the gasket, as a flexible material, reduces the mechanical stress exerted by the support member 30 on the solar cell, thereby reducing damage or deformation of the solar cell. When the support member 30 includes foam, because the foam material is lightweight and has a certain degree of elasticity, the support member 30 can provide flexible support for the solar cell, thereby reducing damage or deformation of the solar cell.

[0066] In one possible implementation, the elastic modulus of the support member 30 is between 0.01 MPa and 10 MPa. For example, it is 0.01 MPa, 0.02 MPa, 0.05 MPa, 1 MPa, 2 MPa, 4 MPa, 5 MPa, 8 MPa, 9 MPa, or 10 MPa. Thus, the support member 30 possesses a certain degree of flexibility and elasticity. During lamination, the support member 30 can act as a buffer, reducing the force exerted by the support member 30 on the solar cells, thereby reducing damage or deformation of the solar cells.

[0067] In one possible implementation, the ratio of the height of the support member 30 to the height of the first battery cell 10 is 0.5 to 1.5. For example, ratios such as 0.5, 0.6, 0.7, 0.8, 0.85, 0.9, 0.95, 0.97, 1, 1.1, 1.2, 1.3, 1.4, and 1.5. This ensures that the support member 30 supports the second battery cell 20 while reducing the risk of microcracks or fragments in the battery assembly 100 caused by the support member 30 being too high.

[0068] Preferably, the ratio of the height of the support member 30 to the height of the first battery cell 10 can be set to 1. That is, the height of the first battery cell 10 of the support member 30 is flush.

[0069] In one possible implementation, the support surface of the support member 30 is curved. Thus, when the support member 30 supports the second battery cell 20, the curved support surface can reduce the contact area between the support member 30 and the second battery cell 20, thereby reducing mechanical damage to the second battery cell 20.

[0070] Furthermore, the supporting surface of the support member 30 can also be set as a plane. For example, the supporting surface of the support member 30 can be triangular, rectangular, circular, arc-shaped, etc. The specific shape and structure of the support member 30 can be adjusted according to the actual structure of the first battery cell 10 and the second battery cell 20. For example, the supporting surface of the support member 30 can be set as an isosceles triangle with a right-angled side of 2μm. Specifically, the area of ​​the support member 30 can be set to 0.5μm². 2 up to 2μm 2 For example, 0.5μm 2 0.8μm 2 1μm 2 1.2μm 2 1.4μm 2 1.5μm 2 .

[0071] Of course, the supporting surface of the support member 30 can also correspond to the specific structure of the non-overlapping area 212. This facilitates the manufacturing and arrangement of the support member 30.

[0072] like Figure 8As shown, in one possible implementation, the support member 30 has a plurality of openings 31. In this way, the amount of material used in the support member 30 can be reduced, thereby reducing the manufacturing cost of the support member 30.

[0073] Specifically, the support surface of the support member 30 can be designed to be hollow, which reduces the manufacturing cost of the support member 30 while ensuring that the support member 30 provides sufficient support for the non-overlapping area 212. The opening 31 can be set as a single opening with a larger area, or it can be set as multiple openings with smaller areas.

[0074] In one possible implementation, the ratio of the area of ​​the support surface of the support member 30 to the area of ​​the non-overlapping region 212 is 0.5 to 1. For example, ratios such as 0.5, 0.55, 0.6, 0.65, 0.7, 0.8, 0.9, 0.95, 0.96, 0.98, and 1. This ensures that, on the one hand, the support member 30 can provide sufficient support to the non-overlapping region 212. If the support area is too small, the support member 30 may not provide sufficient support to the non-overlapping region 212, failing to effectively support the non-overlapping region 212 of the second solar cell 20, leading to microcracks and fragmentation of the second solar cell 20 during lamination. On the other hand, this also reduces the manufacturing cost of the support member 30.

[0075] It is understood that in such embodiments, the battery module 100 may further include a frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back of the battery cells, as well as between the photovoltaic glass and adjacent battery cells. 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.

[0076] Photovoltaic glass can be applied to the encapsulating film on the front of the solar cell. This photovoltaic glass can be ultra-clear glass, possessing 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 cell while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cell together, providing sealing, insulation, and waterproofing / moisture protection for the cell.

[0077] The backsheet can be attached to the adhesive film on the back of the solar cells. The backsheet protects and supports the cells, providing 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 cells, 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 example, the solar module 100 can be installed at the desired location via the frame.

[0078] 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.

[0079] 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, The device includes a first battery cell, a second battery cell, and a support member. The first battery cell overlaps with the second battery cell, forming an overlapping area and a non-overlapping area at the edge of the second battery cell. The overlapping area is supported by the first battery cell, and the non-overlapping area is located at the corner of the first battery cell. The support member is located on the outside of the first battery cell and is used to support the non-overlapping area.

2. The battery assembly according to claim 1, characterized in that, The ratio of the area of ​​the support surface of the support member to the area of ​​the non-overlapping area is 0.1 to 1.

3. The battery assembly according to claim 1, characterized in that, The ratio of the height of the support member to the height of the first battery cell is 0.5 to 1.

5.

4. The battery assembly according to claim 1, characterized in that, The support component is an insulating component.

5. The battery assembly according to claim 1, characterized in that, The elastic modulus of the support member is from 0.01 MPa to 10 MPa.

6. The battery assembly according to claim 1, characterized in that, The support component includes at least one of insulating adhesive, gasket, and foam.

7. The battery assembly according to claim 1, characterized in that, The support surface of the support member is an arc surface.

8. The battery assembly according to claim 1, characterized in that, The support member is detachably or fixedly connected to the first battery cell.

9. The battery assembly according to claim 1, characterized in that, The support member is spaced apart from the first battery cell.

10. The battery assembly according to claim 1, characterized in that, At least one of the first and second battery cells is a multi-cell battery cell after being cut.

11. The battery assembly according to claim 10, characterized in that, At least one of the first and second battery cells is a cut half-cell.

12. The battery assembly according to claim 1, characterized in that, The first battery cell includes at least one first chamfer, which is the corner of the first battery cell near the overlapping area; The second battery cell includes at least one first right angle, which is the corner of the second battery cell on the side closer to the overlapping area; When the first battery cell overlaps with the second battery cell, the first right angle of the second battery cell is placed on the first chamfer of the first battery cell.

13. The battery assembly according to claim 12, characterized in that, The support member is located within the gap formed by the first right angle and the first battery cell.

14. The battery assembly according to claim 1, characterized in that, The support member is at least one of the following shapes: triangular, square, circular, and elliptical.

15. The battery assembly according to claim 1, characterized in that, The thickness of the support member is 0.5 to 1.5 times the height of the first battery cell.

16. A photovoltaic system, characterized in that, Includes the battery assembly as described in any one of claims 1 to 15.

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