Battery assembly and photovoltaic system

Abstract

The invention is suitable for the field of photovoltaic technology, and provides a battery assembly and a photovoltaic system, and the battery assembly comprises a plurality of battery pieces, each battery piece comprises a chamfer edge and a straight edge which are parallel to each other, and the plurality of battery pieces are partially overlapped in a first direction to form a battery string. The plurality of battery strings are partially overlapped along the second direction to define a plurality of closed areas, the plurality of battery pieces are partially overlapped to eliminate the piece spacing, and the plurality of battery strings are partially overlapped to define a plurality of closed areas to reduce the string spacing; according to the photovoltaic module, more battery pieces can be arranged in a limited area, the utilization rate of the space area and the power generation power of the module are improved, in addition, due to the formation of the closed area, the light leakage condition of the battery module can be improved, and the power generation efficiency of the photovoltaic module can be improved by utilizing light rays in the intervals of the battery strings; the photovoltaic module is better in overall attractiveness, and the production efficiency can be improved.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic technology, and in particular relates to a battery assembly and a photovoltaic system. Background Art

[0002] At present, there is a spacing between two adjacent battery cells in a conventional battery module, and there is a spacing between two adjacent battery strings. The existence of the above spacing not only limits the power generation power per unit area of ​​the battery module, but also causes light leakage problems. Therefore, it is an industry development trend to reduce the spacing between cells and strings, or even completely eliminate the spacing between cells and strings. Summary of the invention

[0003] The present application provides a battery assembly, aiming to solve the problem of the existence of a spacing between two adjacent battery cells and a spacing between two adjacent battery strings in a conventional battery assembly. The existence of the above spacing not only limits the power generation power per unit area of ​​the battery assembly, but also causes light leakage.

[0004] The present application is implemented as follows: a battery assembly includes a plurality of battery cells, each of which has a chamfer, and each of which includes a chamfered edge and a straight edge that are parallel to each other. The plurality of battery cells are partially overlapped along a first direction to form a battery string, and the plurality of battery strings are partially overlapped along a second direction to enclose a plurality of closed areas.

[0005] Optionally, the chamfered edge of one of the two adjacent battery sheets is overlapped and connected with the straight edge of the other of the two adjacent battery sheets.

[0006] Optionally, along the third direction, the chamfered edge of one of the two adjacent battery sheets is stacked on the straight edge of the other of the two adjacent battery sheets.

[0007] Optionally, the orthographic projection of the closed area in the third direction is a triangle.

[0008] Optionally, the area S of the closed area satisfies the following formula: S=1 / 2*(L-d1*cos(180°-α)-d2 / sin(180°-α))^2*sin(2α-180°), wherein L is the length of the chamfered side, d1 is the width of the local overlap between the battery strings, d2 is the width of the local overlap between the battery cells, and ɑ is the angle of the chamfer.

[0009] Optionally, the chamfered edge of one of the two adjacent battery cells is overlapped and connected with the chamfered edge of the other of the two adjacent battery cells.

[0010] Optionally, the orthographic projection of the closed area in the third direction is a rhombus.

[0011] Optionally, the area S of the closed region satisfies the following formula: S=(L-d1*cos(180°-α)-d2 / sin(180°-α))^2*sin(2α-180 °), where L is the length of the chamfer, d1 is the width of the local overlap between battery strings, d2 is the width of the local overlap between battery cells, and ɑ is the angle of the chamfer.

[0012] Optionally, the closed area is a porous structure.

[0013] Optionally, the side length of the chamfer is 0.3-0.8 mm.

[0014] Optionally, the chamfer angle is 100°~160°.

[0015] Optionally, the width of the local overlap between the battery cells is 0-0.5 mm.

[0016] Optionally, the width of the local overlap between the battery strings is 0-0.8 mm.

[0017] The present application arranges more cells in a limited area by partially overlapping multiple cells to eliminate the spacing between cells, and by partially overlapping multiple cell strings to enclose multiple closed areas to reduce the string spacing, thereby improving the utilization rate of the space area and the power generation capacity of the components. In addition, the formation of the closed area can not only improve the light leakage of the cell component, but also facilitate the use of light within the cell string spacing to improve the power generation efficiency of the photovoltaic component. Through the structural setting of the present application, the overall aesthetics of the photovoltaic component is better, which is conducive to improving production efficiency.

[0018] A photovoltaic system includes the above-mentioned battery assembly. The technical effect of the photovoltaic system is the same as the technical effect of the above-mentioned battery assembly, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the battery cell provided in the present application; Figure 2 It is a structural schematic diagram of the first battery string provided in the present application; Figure 3 It is a structural schematic diagram of the second battery string provided in the present application; Figure 4 It is a structural schematic diagram of the first battery assembly provided in the present application; Figure 5 It is a schematic diagram of the structure of the second battery assembly provided in the present application.

[0020] Description of reference numerals: 100, battery cell; 101, chamfer; 102, chamfered edge; 103, straight edge; 200, battery string; 300, closed area. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below 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 throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0022] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0027] like Figure 4 and Figure 5As shown, in an embodiment of the present application, a battery assembly includes a plurality of battery cells 100, the battery cell 100 has a chamfer 101, the battery cell 100 includes a chamfered edge 102 and a straight edge 103 parallel to each other, the plurality of battery cells 100 are partially overlapped along a first direction to form a battery string 200, and the plurality of battery strings 200 are partially overlapped along a second direction to enclose a plurality of closed areas 300. The battery cell 100 in the present application may be a half-cell battery cell 100 obtained by slicing a whole cell 100, the four corners of the whole cell 100 are chamfered 101, the cell 100 formed by slicing has a chamfered edge 102 and a straight edge 103, the chamfered edge 102 is a non-cutting edge, the straight edge 103 is a cutting edge, the chamfered edge 102 is the original side edge of the whole cell 100, and the straight edge 103 is the straight edge 103 formed by slicing the whole cell 100. In the embodiment of the present application, the second direction intersects with the first direction. Specifically, the second direction may be perpendicular to the first direction. Exemplarily, the first direction may be the width direction of the battery cell 100, and the second direction may be the length direction of the battery cell 100. Exemplarily, the battery cells 100 in the present application are arranged sequentially from top to bottom, and the battery cells 100 on the lower side are overlapped and placed on the battery cells 100 on the upper side, and the battery strings 200 are arranged sequentially from left to right, and the left side of the battery string 200 on the right side is overlapped and placed on the battery on the left side, so that the gap between the cells and the string spacing is fully utilized, the area of ​​about 3 half-cell batteries can be increased, and the power of the battery assembly can be increased by about 2%.

[0028] It should be noted that the battery cell 100 in the embodiment of the present application is usually formed by cutting a single crystal silicon rod into a square. Since a single crystal silicon rod is generally cylindrical, in order to maximize the illumination area and save silicon rod material, the battery cell 100 formed by cutting a single crystal silicon rod into a square usually has rounded corners. In order to achieve the purpose of smoother corners of the battery cell 100 and reduce corner stress, it is usually necessary to further process the rounded corners so that the battery cell 100 has four chamfers. In addition, in order to make the battery cell 100 have different specifications and can be used in different environments, the battery cell 100 can be further cut into multiple small-sized battery cells 100. One side of the cut battery cell 100 has a chamfered edge 102, and the other side has a straight edge 103 without chamfers.

[0029] In this embodiment, the two sides of any battery cell 100 along the first direction are respectively a chamfered edge 102 and a straight edge 103. Specifically, one side edge of the battery cell 100 has chamfers at both ends along the second direction, and this side of the battery cell 100 is the chamfered edge 102; the other side edge of the battery cell 100 is a straight edge along the second direction, and this side of the battery cell 100 is a straight edge 103.

[0030] The present application arranges more battery cells 100 in a limited area by partially overlapping multiple battery cells 100 to eliminate the spacing between cells, and by partially overlapping multiple battery strings 200 to enclose multiple closed areas 300 to reduce the string spacing. The present application is suitable for large-size battery cells 100, thereby improving the utilization rate of the space area and the power generation power of the components. There is no need to add new process steps or equipment modifications in the process. It is only necessary to use the original production equipment to change the stacking method of the battery cells 100 to achieve the negative spacing between the battery cells 100. In addition, the formation of the closed area 300 can not only improve the light leakage of the battery component, but also facilitate the use of light within the spacing between the battery strings 200 to improve the power generation efficiency of the photovoltaic component. Through the structural setting of the present application, the overall aesthetics of the photovoltaic component is better, which is conducive to improving production efficiency.

[0031] like Figure 1 As shown, in the embodiment of the present application, the battery cell 100 is formed by cutting the whole battery, and the four corners of the whole battery are chamfered 101, which is also the basic morphology of the solar cell in the related art. Two of the four corners of the battery cell 100 formed after the whole battery is cut are chamfered 101, and the other two are right angles. The battery cell 100 has chamfered edges 102 and straight edges 103 parallel to each other, the chamfered edge 102 includes two chamfers 101, and the straight edge 103 includes two right angles. It can be understood that the battery cell 100 also includes a first side edge and a second side edge arranged between the chamfered edge 102 and the straight edge 103, and the first side edge and the second side edge are parallel to each other.

[0032] like Figure 2 and Figure 3 As shown, there are multiple ways to overlap the battery cells 100. For example, in the battery string 200, the chamfered edge 102 of the battery cell 100 overlaps with the straight edge 103 of the adjacent battery cell 100, the straight edge 103 of the battery cell 100 overlaps with the straight edge 103 of the adjacent battery cell 100, and the chamfered edge 102 of the battery cell 100 overlaps with the chamfered edge 102 of the adjacent battery cell 100. In the battery assembly, the first side edge of the battery cell 100 in the battery string 200 overlaps with the second side edge of the battery cell 100 in the adjacent battery string 200. The overlapping arrangement form between the above-mentioned battery cells 100 is selected as needed, and this application does not limit this.

[0033] like Figure 3As shown, in some embodiments, the chamfered edge 102 of one of two adjacent battery cells 100 overlaps and connects with the straight edge 103 of the other of the two adjacent battery cells 100. That is, the two adjacent battery cells 100 in the battery string 200 are arranged in the same direction. Specifically, the multiple battery cells 100 in the battery string 200 are stacked in sequence along the first direction. Preferably, along the third direction, the chamfered edge 102 of one of the two adjacent battery cells 100 is stacked on the straight edge 103 of the other of the two adjacent battery cells 100. In the embodiment of the present application, the third direction is the thickness direction of the battery cell 100, and the third direction, the first direction and the second direction are perpendicular to each other. By stacking the chamfered edge 102 of the battery cell 100 on the straight edge 103 of the adjacent battery cell 100, in the lamination direction, the straight edge 103 of the battery cell 100 located below can completely disperse the lamination pressure applied by the chamfered edge 102 of the battery cell 100 located above, which can reduce the risk of hidden cracks at the edge of the battery cell 100.

[0034] like Figure 4 As shown, in some embodiments, the orthographic projection of the enclosed area 300 in the third direction is a triangle, and at this time, the enclosed area 300 is a pore structure formed by the chamfered edges 101 of the two battery cells 100 and the straight edges of the two battery cells 100. It can be understood that since the overlapping areas of the battery cells 100 in the two groups of battery strings 200 are the same, the orthographic projection of the enclosed area 300 in the third direction is an isosceles triangle, and the regular enclosed area 300 can improve the appearance of the battery assembly on the one hand, and facilitate the control and adjustment of the area of ​​the enclosed area 300 on the other hand.

[0035] In other embodiments, a reflective film may be further provided in the enclosed area 300. For example, the reflective film may be provided in a triangular shape and filled in the enclosed area 300 to enhance the utilization of light in the enclosed area 300 and improve the efficiency of the battery assembly.

[0036] It should be noted that, since the battery cell 100 has a chamfer 101, the overlapping edges of the battery cell 100 cannot completely cover each other, and the closed area 300 comes from the closed pore structure formed by at least four battery cells 100 in the battery assembly. The size of the overlapping area between the battery cells 100 is directly related to the size of the closed area 300. If the overlapping area of ​​the battery cells 100 is too large, the battery cells 100 will be severely blocked, which will also lead to a loss in the efficiency of the battery assembly. If the overlapping area of ​​the battery cells 100 is too small, the risk of hidden cracks at the edges of the battery cells 100 increases. The pore structure will also cause light leakage areas in the battery assembly, which will lose the efficiency of the battery assembly. Based on battery cells 100 of different sizes and different chamfer 101 structures, how to overlap the battery cells 100 and the battery strings 200, and then control the area of ​​the closed area 300 within an appropriate range is a problem to be solved in this application.

[0037] In response to the above problems, the present application sets the area of ​​the closed area 300. Based on the fact that the positive projection of the closed area 300 in the third direction is a triangle, the area S of the closed area 300 satisfies the following formula: S=1 / 2*(L-d1*cos(180°-α)-d2 / sin(180°-α))^2*sin(2α-180 °), where L is the side length of the chamfer 101, d1 is the width of the local overlap between the battery strings 200, d2 is the width of the local overlap between the battery cells 100, and ɑ is the angle of the chamfer 101. Through the above relationship, for different battery cells 100, the relationship between the width of the overlapping area of ​​the battery cell 100 and the area of ​​the closed area 300 can be established, which is between the efficiency loss caused by shading between the battery cells 100 and the efficiency loss caused by light leakage in the closed area 300, so that the applicant can quickly find the optimal setting value of the appropriate overlapping area of ​​the battery cells 100, and provide a reliable decision-making basis for the arrangement of the battery cells 100 in the battery assembly process production.

[0038] like Figure 2 As shown, in some embodiments, the chamfered edge 102 of one of two adjacent battery cells 100 overlaps and connects with the chamfered edge 102 of the other of the two adjacent battery cells 100 . That is to say, two adjacent battery cells 100 in the battery string 200 are arranged in different directions. Specifically, the multiple battery cells 100 in the battery string 200 are stacked in sequence along the first direction, the chamfered edge 102 of the battery cell 100 and the chamfered edge 102 of the adjacent battery cell 100 are overlapped, and the straight edge 103 of the battery cell 100 and the straight edge 103 of the adjacent battery cell 100 are overlapped. By arranging the edge structure of the overlapping area of ​​two adjacent battery cells 100 in the above manner, it is not necessary to distinguish the positional relationship of the stacking arrangement of the multiple battery cells 100 in the first direction. In the thickness direction of the battery cell 100, the upper battery cell 100 can be laminated on the lower battery cell 100, or the lower battery cell 100 can be laminated on the upper battery cell 100. The arrangement of the battery cells 100 is flexible and can be selected according to needs. Since the edge structures of two adjacent battery cells 100 in the overlapping area are the same, in the lamination direction, the battery cell 100 located below can completely disperse the lamination pressure of the battery cell 100 located above, which can also reduce the risk of hidden cracks at the edges of the battery cell 100.

[0039] like Figure 5As shown, in some embodiments, the orthographic projection of the enclosed area 300 in the third direction is a rhombus. The enclosed area 300 is a pore structure formed by the chamfered edges 101 of two battery cells 100 and the chamfered edges 101 of another two battery cells 100. It can be understood that since the overlapping areas of the battery cells 100 in the two groups of battery strings 200 are the same, the orthographic projections of the multiple enclosed areas 300 in the third direction are consistent in shape and size. The regular enclosed areas 300 can improve the appearance of the battery assembly on the one hand, and facilitate the control and adjustment of the area of ​​the enclosed areas 300 on the other hand.

[0040] In other embodiments, a reflective film may be further provided in the enclosed area 300. For example, the reflective film may be provided in a diamond shape, and the reflective film is filled in the enclosed area 300 to enhance the utilization of light in the enclosed area 300 and improve the efficiency of the battery assembly.

[0041] In the embodiment of the present application, based on the fact that the orthographic projection of the closed area 300 in the third direction is a rhombus, the area S of the closed area 300 satisfies the following formula: S=(L-d1*cos(180°-α)-d2 / sin(180°-α))^2*sin(2α-180 °), where L is the side length of the chamfer 101, d1 is the width of the local overlap between the battery strings 200, d2 is the width of the local overlap between the battery cells 100, and ɑ is the angle of the chamfer 101. Through the above relationship, for different battery cells 100, it is possible to establish a relationship between the width of the overlapping area of ​​the battery cell 100 and the area of ​​the closed area 300, which is between the efficiency loss caused by shading between the battery cells 100 and the efficiency loss caused by light leakage in the closed area 300, so that the applicant can quickly find the optimal setting value of the overlapping area of ​​the appropriate battery cell 100, and provide a reliable decision-making basis for the arrangement of the battery cell 100 in the battery assembly process production.

[0042] In the embodiment of the present application, the side length of the chamfer 101 is 0.3~0.8mm. In such an embodiment, the side length of the chamfer 101 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm or any value between 0.3mm-0.8mm, and is not specifically limited here. Within this range, the chamfer 101 treatment of the battery cell 100 can enhance the edge strength of the battery cell 100, reduce stress concentration, and reduce cracks or damage caused by external forces, while the area loss of the battery cell 100 is small.

[0043] The angle of the chamfer 101 is 100°~160°. In such an embodiment, the angle of the chamfer 101 can be 100°, 110°, 120°, 130°, 140°, 150°, 160° or any value between 100°~160°, and is not specifically limited here. The chamfer 101 treatment can help disperse the stress at the edge of the battery cell 100 and reduce the problem of battery cell 100 rupture caused by stress concentration. Within this angle range, the chamfer 101 can disperse the impact of external forces on the edge of the battery cell 100 and reduce cracks or damage caused by external forces.

[0044] The width of the partial overlap between the battery cells 100 is 0-0.5 mm. In such an embodiment, the width of the partial overlap between the battery cells 100 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or any value between 0-0.5 mm, and is not specifically limited here. Through the partial overlap between the battery cells 100, more battery cells 100 can be placed in a limited component area, thereby optimizing the layout of the component and improving the photoelectric conversion efficiency of the component. The overlapping design can significantly reduce the gaps between the battery cells 100, which usually reflect or scatter light, causing light energy loss. The width of the partial overlap between the battery cells 100 is within this range, which can effectively control the efficiency loss caused by the shading between the battery cells 100. Preferably, the width of the partial overlap between the battery cells 100 is 0.3-0.5 mm, within this range, the risk of hidden cracks caused by the superposition between the battery cells 100 can be reduced.

[0045] The width of the local overlap between the battery strings 200 is 0~0.8mm. In such an embodiment, the width of the local overlap between the battery strings 200 can be 0, 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm or any value between 0-0.8mm, and is not specifically limited here. When the width of the local overlap between the battery strings 200 is within this range, the efficiency loss caused by the obstruction between the battery strings 200 can be effectively controlled. Preferably, the width of the local overlap between the battery strings 200 is 0.4~0.8mm, within this range, the risk of hidden cracks caused by the superposition between the battery strings 200 can be reduced.

[0046] Of course, the battery assembly may also include a back plate and a glass plate. A plurality of battery cells 100 are arranged between the back plate and the glass plate, and welding strips (bus bars, interconnecting strips), conductive back plates, etc. are provided on the battery cells 100 to realize the series connection of the battery cells 100. The adhesive film can be filled on the front and back of the battery cells 100 and between the photovoltaic glass and adjacent battery cells 100. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the adhesive film can be EVA (Ethylene Vinyl Acetate, ethylene-vinyl acetate copolymer) adhesive film or POE (Polyolefin Elastomer, polyolefin elastomer) adhesive film. The specific selection can be made according to the actual situation and is not limited here.

[0047] A photovoltaic system includes the above-mentioned battery assembly. In this embodiment, the photovoltaic system can be used in photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be used in equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system are not limited to this, that is, the photovoltaic system can be used in all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a junction box and an inverter. The photovoltaic array can be an array combination of multiple battery assemblies. For example, multiple battery assemblies can form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter to convert it into the alternating current required by the mains power grid and then connected to the mains network to realize solar power supply.

[0048] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0049] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery assembly, characterized in that: It includes a plurality of battery cells, each of which has a chamfer, and each of which includes a chamfered edge and a straight edge that are parallel to each other. The plurality of battery cells are partially overlapped along a first direction to form a battery string, and the plurality of battery strings are partially overlapped along a second direction to enclose a plurality of closed areas.

2. The battery assembly according to claim 1, characterized in that The chamfered edge of one of the two adjacent battery cells is overlapped and connected with the straight edge of the other of the two adjacent battery cells.

3. The battery assembly according to claim 2, characterized in that: Along the third direction, the chamfered edge of one of the two adjacent battery cells is stacked on the straight edge of the other of the two adjacent battery cells.

4. The battery assembly according to claim 2, characterized in that: The orthographic projection of the closed area in the third direction is a triangle.

5. The battery assembly according to claim 4, characterized in that: The area S of the enclosed area satisfies the following formula: S=1 / 2*(L-d1*cos(180°-α)-d2 / sin(180°-α))^2*sin(2α-180°), wherein L is the length of the chamfered side, d1 is the width of the local overlap between the battery strings, d2 is the width of the local overlap between the battery cells, and ɑ is the angle of the chamfer.

6. The battery assembly according to claim 1, characterized in that: The chamfered edge of one of the two adjacent battery cells is overlapped and connected with the chamfered edge of the other of the two adjacent battery cells.

7. The battery assembly according to claim 6, characterized in that: The orthographic projection of the closed area in the third direction is a rhombus.

8. The battery assembly according to claim 7, characterized in that: The area S of the closed area satisfies the following formula: S=(L-d1*cos(180°-α)-d2 / sin(180°-α))^2*sin(2α-180 °), where L is the length of the chamfer, d1 is the width of the local overlap between battery strings, d2 is the width of the local overlap between battery cells, and ɑ is the angle of the chamfer.

9. The battery assembly according to claim 1, wherein: The closed area is a pore structure.

10. The battery assembly according to claim 1, wherein: The side length of the chamfer is 0.3-0.8 mm.

11. The battery assembly according to claim 1, characterized in that: The chamfer angle is 100° to 160°.

12. The battery assembly according to claim 1, wherein: The width of the local overlap between the battery cells is 0-0.5 mm.

13. The battery assembly according to claim 1, wherein: The width of the local overlap between the battery strings is 0-0.8 mm.

14. A photovoltaic system, characterized in that: A battery assembly comprising any one of claims 1 to 13.

Images