Battery assembly and photovoltaic system

Abstract

The application is suitable for the photovoltaic technical field, and provides a cell assembly and a photovoltaic system, which comprise a plurality of cell pieces, each of the plurality of cell pieces has an opposite right-angle side and a chamfered side, and the plurality of cell pieces are connected with each other to form at least adjacent first and second cell strings; the application eliminates the gap between the cell pieces by overlapping the cell pieces in the cell string, improves the effective light-receiving area of the assembly, forms two opposite overlapping modes in the adjacent first and second cell strings, alternately stacks the right-angle side and the chamfered side to form a complementary overlapping structure, forms a symmetrical mechanical structure between the two cell strings, effectively offsets the stress concentration caused by external load, reduces the risk of cell piece breakage, enhances the physical engagement between the cell strings in different overlapping directions, reduces the influence of vibration or deformation on the assembly, and prolongs the service life.

Description

Technical Field

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

[0002] Photovoltaic modules are used to convert solar energy into electrical energy. A photovoltaic module contains multiple photovoltaic cells. In conventional modules, there is a gap between adjacent cells. The existence of this gap not only limits the power generation per unit area of ​​the module but also causes light leakage. Therefore, reducing the gap or even eliminating the gap completely is an industry trend. Utility Model Content

[0003] This application provides a battery module designed to address the issue of spacing between adjacent cells in conventional battery modules. This spacing not only limits the power generation per unit area of ​​the battery module but also causes light leakage.

[0004] This application is implemented as follows: a battery assembly includes a plurality of battery cells, each of the plurality of battery cells having a right-angled side and a chamfered side disposed opposite to each other, and the plurality of battery cells are interconnected to form at least an adjacent first battery string and a second battery string; in the first battery string, the right-angled side of one of two adjacent battery cells overlaps the chamfered side of the other of two adjacent battery cells, and in the second battery string, the chamfered side of one of two adjacent battery cells overlaps the right-angled side of the other of two adjacent battery cells.

[0005] Optionally, the first battery string and the second battery string are spaced apart.

[0006] Optionally, the first battery string and the second battery string are spaced apart by a fourth preset distance, wherein the fourth preset distance is greater than or equal to 0 and less than or equal to 3 mm.

[0007] Optionally, the first battery string and the second battery string are partially overlapped.

[0008] Optionally, the first battery string and the second battery string are overlapped by a third preset distance, wherein the third preset distance is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0009] Optionally, within the first battery string, adjacent battery cells are arranged to overlap at a first preset distance.

[0010] Optionally, the range of the first preset distance is greater than or equal to 0.1 mm and less than or equal to 0.8 mm.

[0011] Optionally, in the second battery string, adjacent battery cells are arranged to overlap at a second preset distance.

[0012] Optionally, the range of the second preset distance is greater than or equal to 0.1 mm and less than or equal to 0.8 mm.

[0013] Optionally, the first preset distance and the second preset distance are equal.

[0014] This application eliminates gaps between cells by overlapping the cells within the cell string, thereby increasing the effective light-receiving area of ​​the module. By forming two opposite stacking methods in adjacent first and second cell strings, with right-angled and chamfered edges alternately stacked to form a complementary stacking structure, a symmetrical mechanical structure is formed between the two cell strings. This effectively counteracts stress concentration caused by external loads, reducing the risk of cell breakage. The different stacking directions enhance the physical interlocking between cell strings, reducing the impact of vibration or deformation on the module and extending its service life. Furthermore, the reverse stacking method allows for a certain degree of alignment deviation compensation, reducing production precision requirements and improving yield. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the battery cell provided in the current application;

[0016] Figure 2 This is a structural schematic diagram of the first type of battery assembly provided in the current application;

[0017] Figure 3 This is a structural schematic diagram of the second type of battery assembly provided in the current application.

[0018] Explanation of reference numerals in the attached figures:

[0019] 100, Battery cell; 101, Right-angled edge; 102, Chamfered edge; 200, First battery string; 300, Second battery string. Detailed Implementation

[0020] 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 the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain 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.

[0021] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] 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 application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1 As shown, in some embodiments, a battery module includes a plurality of battery cells 100, each of the plurality of battery cells 100 having a right-angled edge 101 and a chamfered edge 102 formed by cutting oppositely arranged. The battery cell 100 in this application can be a half-cell obtained by dicing a whole battery cell. In this case, by dicing the whole battery cell, the resistance loss can be reduced and the power generation efficiency of the module can be improved.

[0027] It is understood that the grid lines on the solar cell 100 are not shown in the accompanying drawings. The grid lines on the solar cell 100 can be arranged according to actual conditions. For example, it can be a solar cell 100 with a main grid or a solar cell 100 without a main grid. The type of solar cell 100 can be a back-contact cell, that is, all electrodes (positive and negative electrodes) are located on the back of the cell, and there are no metal grid lines blocking the front, maximizing light absorption. For example, an IBC (Interdigitated Back Contact) cell; the type of solar cell 100 can also be a bifacial cell, that is, both the front and back can receive light and generate electricity, and the back can gain power through reflected light or ambient light. For example, PERC bifacial, TOPCon bifacial, HJT bifacial, etc. This application does not limit this.

[0028] like Figure 2 and Figure 3As shown, furthermore, multiple battery cells 100 are interconnected to form at least adjacent first battery strings 200 and second battery strings 300. Specifically, multiple battery cells 100 within the first battery string 200 are connected in series by soldering ribbons, and multiple battery cells 100 within the second battery string 300 are connected in series by soldering ribbons. The first battery string 200 and the second battery string 300 can be connected in series or in parallel via busbars. In other embodiments, multiple battery cells 100 may also form a third battery string or a fourth battery string, etc., which is not limited in this application. The stacking configuration of the battery cells 100 within the third and fourth battery strings can be set with reference to the configuration of the first battery string 200 and the second battery string 300, which will not be elaborated here.

[0029] In other words, for the battery strings formed within the battery assembly, the stacking structure of the battery cells 100 in adjacent battery strings is reversed. Within one battery string, the right-angled edge 101 of one of the adjacent battery cells 100 is stacked on the chamfered edge 102 of the other adjacent battery cell 100; within another battery string, the chamfered edge 102 of one of the adjacent battery cells 100 is stacked on the right-angled edge 101 of the other adjacent battery cell 100. For example, this applies to the first battery string 200 and the second battery string 300, or the third battery string and the fourth battery string, and so on. In some embodiments, within the first battery string 200, the right-angled edge 101 of one of the adjacent battery cells 100 is stacked on the chamfered edge 102 of the other adjacent battery cell 100; and within the second battery string 300, the chamfered edge 102 of one of the adjacent battery cells 100 is stacked on the right-angled edge 101 of the other adjacent battery cell 100. This configuration creates a symmetrical mechanical structure between adjacent cell strings in the battery module, effectively offsetting stress concentration caused by external loads and reducing the risk of cell breakage. Different stacking directions enhance the physical interlocking between cell strings, reducing the impact of vibration or deformation on the module and extending its service life. Furthermore, the reverse stacking method allows for a certain degree of alignment deviation compensation, reducing production precision requirements and improving yield.

[0030] It should be noted that, in the embodiments of this application, the right-angled edge 101 of one of two adjacent battery cells 100 is superimposed on the chamfered edge 102 of the other two adjacent battery cells 100, or the chamfered edge 102 of one of two adjacent battery cells 100 is superimposed on the right-angled edge 101 of the other two adjacent battery cells 100, as viewed from the light-receiving surface of the battery assembly. Specifically, in the first battery string 200, the right-angled edge 101 of the second battery cell overlaps on the chamfered edge 102 of the first battery cell, the right-angled edge 101 of the third battery cell overlaps on the chamfered edge 102 of the second battery cell, and so on, until the last Nth battery cell, where N is a positive integer; in the second battery string 300, the chamfered edge 102 of the second battery cell overlaps on the right-angled edge 101 of the first battery cell, the chamfered edge 102 of the third battery cell overlaps on the right-angled edge 101 of the second battery cell, and so on, until the last Nth battery cell, where N is a positive integer. Since each cell 100 has a cut edge and a chamfered edge 102 that are set opposite to each other, the chamfered edges 102 and cut edges of multiple cells 100 are overlapped. Within the same cell string, the overlap of each pair of adjacent cells 100 is consistent, which helps with the layout of the cell assembly and simplifies the layout steps.

[0031] In the battery assembly, the contact areas between the overlapping battery cells 100 are not electrically connected. That is, there is no need to set conductive adhesive or other adhesive between the overlapping areas. The battery cells 100 are simply overlapped together.

[0032] like Figure 3 As shown, in some embodiments, the first battery string 200 and the second battery string 300 are spaced apart. This spacing design allows localized shading to affect only a single battery string, while unshaded adjacent battery strings can still generate electricity normally, improving shading tolerance. Furthermore, the spacing area increases the reflection and scattering of incident light from the back, improving the bifaciality. Further, a reflective film can be provided in the spacing area to fully utilize sunlight within the spacing area. In addition, this provides a buffer space between adjacent battery strings, preventing them from contacting and being damaged when the battery assembly is subjected to external forces. Preferably, the first battery string 200 and the second battery string 300 are spaced apart by a fourth preset distance, which is greater than or equal to 0 and less than or equal to 3 mm. In such embodiments, the fourth preset distance can be 0 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 2 mm, 2.2 mm, 2.6 mm, 2.8 mm, 3 mm, or any value between 0 mm and 3 mm; no specific limitation is imposed here. Within this range, the risk of battery string merging can be reduced, and the stability of adjacent battery string connections can be improved.

[0033] like Figure 2As shown, in some embodiments, the first battery string 200 and the second battery string 300 are partially overlapped. This overlap allows for a smaller battery module size, resulting in a smaller footprint. Alternatively, with a fixed battery module size, more battery cells 100 can be placed, increasing the module's power output and reducing the cost per watt. Furthermore, the overlapping area forms distributed support points through lamination, dispersing stress and improving module reliability. Preferably, the first battery string 200 and the second battery string 300 overlap at a third preset distance, which is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. In such embodiments, the third preset distance can be any value between 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.1 mm to 0.5 mm, without specific limitation. Within this range, power loss due to shading between battery strings can be effectively controlled, and the stacked structure between adjacent battery strings is stable.

[0034] In some embodiments, within the first battery string 200, adjacent battery cells 100 are overlapped at a first preset distance. This eliminates gaps between battery cells 100, allowing for better concealment of the solder ribbons. Furthermore, the overlapping arrangement of the battery cells 100 reduces the size of the battery assembly, resulting in a smaller space occupied by the battery string. Alternatively, with a fixed battery assembly size, more battery cells 100 can be placed, increasing the power of the battery string and reducing the cost per watt. Further, the first preset distance is greater than or equal to 0.1 mm and less than or equal to 0.8 mm. In such embodiments, the first preset distance can be any value between 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, or 0.1 mm to 0.8 mm; no specific limitation is imposed here.

[0035] In some embodiments, within the second battery string 300, adjacent battery cells 100 are overlapped at a second preset distance. This eliminates gaps between battery cells 100, allowing for better concealment of the solder ribbons. Furthermore, the overlapping arrangement of the battery cells 100 reduces the size of the battery assembly, resulting in a smaller space occupied by the battery string. Alternatively, with a fixed battery assembly size, more battery cells 100 can be placed, increasing the power output of the battery string and reducing the cost per watt. Further, the second preset distance is greater than or equal to 0.1 mm and less than or equal to 0.8 mm. In such embodiments, the second preset distance can be any value between 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, or 0.1 mm to 0.8 mm; no specific limitation is imposed here.

[0036] In some embodiments, the first preset distance and the second preset distance are equal. This ensures that the overlap distance between any two adjacent battery cells 100 within each battery string is consistent, which facilitates the layout of the battery assembly and simplifies the layout process.

[0037] In some embodiments, a photovoltaic system includes the aforementioned battery modules. 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, and can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0038] In the description of this specification, the use of terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., refers to specific features, structures, materials, or characteristics described in connection with the embodiments or examples, which are 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 embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] 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 multiple battery cells, each of which has a right-angled side and a chamfered side arranged opposite each other. The multiple battery cells are interconnected to form at least an adjacent first battery string and a second battery string. In the first battery string, the right-angled side of one of two adjacent battery cells overlaps the chamfered side of the other two adjacent battery cells. In the second battery string, the chamfered side of one of two adjacent battery cells overlaps the right-angled side of the other two adjacent battery cells.

2. The battery assembly as claimed in claim 1, characterized in that, The first battery string and the second battery string are spaced apart.

3. The battery assembly as described in claim 2, characterized in that, The first battery string and the second battery string are spaced apart by a fourth preset distance, the fourth preset distance being greater than or equal to 0 and less than or equal to 3 mm.

4. The battery assembly as claimed in claim 1, characterized in that, The first battery string and the second battery string are partially overlapped.

5. The battery assembly as claimed in claim 4, characterized in that, The first battery string and the second battery string are overlapped at a third preset distance, which is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

6. The battery assembly as claimed in claim 1, characterized in that, Within the first battery string, adjacent battery cells are arranged to overlap at a first preset distance.

7. The battery assembly as claimed in claim 6, characterized in that, The first preset distance is greater than or equal to 0.1 mm and less than or equal to 0.8 mm.

8. The battery assembly as claimed in claim 6, characterized in that, Within the second battery string, adjacent battery cells are arranged to overlap at a second preset distance.

9. The battery assembly as claimed in claim 8, characterized in that, The second preset distance is greater than or equal to 0.1 mm and less than or equal to 0.8 mm.

10. The battery assembly as claimed in claim 8, characterized in that, The first preset distance and the second preset distance are equal.

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

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