Battery assembly and photovoltaic assembly

Abstract

The utility model discloses a battery assembly, which comprises a plurality of battery strings, the plurality of battery strings comprise at least one first battery string and at least one second battery string, the first battery string comprises at least one first battery piece, at least one first chamfer is formed on the first battery piece, the second battery string comprises at least one second battery piece, and at least one second chamfer is formed on the second battery piece. At least one second chamfer is formed on the second battery piece, the first chamfer is arranged at one end of the first battery piece along the length direction of the battery string, and the second chamfer is arranged at the other end of the second battery piece along the length direction of the battery string. Therefore, the first battery string at least comprises a first battery piece provided with a first chamfer, the second battery string at least comprises a second battery piece provided with a second chamfer, and the arrangement of the first battery piece and the second battery piece facilitates the rapid identification of the polarity of the battery strings, facilitates the arrangement of the battery pieces and the connection between the battery strings, and improves the reliability of the battery strings. The connection ends of the adjacent battery strings are ensured to have opposite polarities, and the assembly process of the battery assembly is simplified.

Description

Technical Field

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

[0002] In existing technologies, it is impossible to quickly identify the positive and negative electrodes of multiple cells in a battery string when they are arranged. In back-contact batteries, there are no electrodes on the front of the battery, and the metal grid lines of the positive and negative electrodes are arranged in a crisscross pattern on the back of the battery. Since the grid lines of the positive and negative electrodes are on the same side of the battery and are arranged in a crisscross pattern, it is impossible to distinguish between the positive and negative grid lines during use. This increases the difficulty of electrical connection of the cells and consequently leads to lower processing efficiency of the battery string. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the first objective of the present invention is to provide a battery assembly that can quickly identify the polarity of battery strings, thereby improving the assembly efficiency of the battery assembly.

[0004] The second objective of this invention is to provide a photovoltaic module, including the battery module described in the above embodiments.

[0005] A battery assembly according to a first aspect of the present invention includes: a plurality of battery strings, the plurality of battery strings including at least one first battery string and at least one second battery string, wherein the first battery string and the second battery string have opposite polarities at their adjacent ends; the first battery string includes at least one first battery cell, the first battery cell having at least one first chamfer; the second battery string includes at least one second battery cell, the second battery cell having at least one second chamfer; the first chamfer is located at one end of the first battery cell along the length direction of the battery string, and the second chamfer is located at the other end of the second battery cell along the length direction of the battery string.

[0006] According to the battery assembly of this utility model embodiment, the first battery string includes at least one first battery cell with a first chamfer, and the second battery string includes at least one second battery cell with a second chamfer. The arrangement of the first and second battery cells facilitates quick identification of the polarity of the battery string, facilitates the arrangement of the battery cells and the connection between the battery strings, ensures that the connection ends of adjacent battery strings have opposite polarities, ensures that the current can flow correctly from one battery string to another, avoids misalignment, simplifies the assembly process of the battery assembly, and improves the processing efficiency of the battery assembly.

[0007] In some embodiments, the first battery string comprises a plurality of the first battery pieces, at least one first chamfer is formed on each of the plurality of the first battery pieces, and the first chamfer is arranged on the same side of the first battery piece along the length direction of the battery string; and / or, the second battery string comprises a plurality of the second battery pieces, at least one second chamfer is formed on each of the plurality of the second battery pieces, and the second chamfer is arranged on the same side of the second battery piece along the length direction of the battery string.

[0008] In some embodiments, the first battery string is a plurality of first battery strings, the second battery string is a plurality of second battery strings, the plurality of first battery strings and the plurality of second battery strings are arranged alternately along the width direction of the battery string, and the first battery string and the second battery string extend along the length direction of the battery string; adjacent first battery strings and second battery strings are connected to each other at the same end along the length direction.

[0009] In some embodiments, one end of the battery string adjacent to the first chamfer and / or the second chamfer is a positive electrode, and the other end of the battery string away from the first chamfer and / or the second chamfer is a negative electrode.

[0010] In some embodiments, further comprising: an interconnection structure connected to the grid lines on the battery piece, the interconnection structure extending along the length direction of the battery string, and the interconnection structure at both ends of the battery string along the length direction is connected to the first battery string and the second battery string adjacent to the interconnection structure, respectively; and the interconnection structure is in contact with the chamfer formed by at least one of the plurality of the first battery pieces and / or the second battery pieces.

[0011] In some embodiments, further comprising: a conductive connecting piece arranged at the same end of the first battery string and the second battery string with opposite polarities, and the conductive connecting piece is connected to the interconnection structure with opposite polarities of the first battery string and the second battery string, respectively.

[0012] In some embodiments, adjacent three first battery pieces and / or second battery pieces of the same battery string are three slices of the same battery piece.

[0013] In some embodiments, a plurality of grid lines are formed on at least one side of the first battery piece along the thickness direction of the battery string, the plurality of grid lines are arranged on both sides of the first battery piece and / or the second battery piece along the thickness direction of the battery string; or, the plurality of grid lines are arranged on one side of the first battery piece and / or the second battery piece along the thickness direction of the battery string.

[0014] In some embodiments, the at least one first cell piece and the at least one second cell piece comprise: a cut surface and a non-cut surface, the non-cut surface is arranged outside the cut surface, and the non-cut surface is formed with at least one chamfer.

[0015] According to the photovoltaic module of the second aspect of the present application, the battery module is the battery module of the first aspect of the present application.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0018] Figure 1 is a schematic view of a battery module according to an embodiment of the present application;

[0019] Figure 2 is Figure 1 is an enlarged schematic view of a P region in the middle;

[0020] Figure 3 is a schematic view of another embodiment of a battery module according to an embodiment of the present application;

[0021] Figure 4 is Figure 3 is an enlarged schematic view of a Q region in the middle;

[0022] Figure 5 is a schematic view of a first cell piece and a second cell piece according to an embodiment of the present application.

[0023] REFERENCE NUMERALS:

[0024] 100, battery module;

[0025] 10, battery string; 11, first battery string; 12, second battery string; 13, first cell piece; 14, second cell piece; 15, first chamfer; 16, second chamfer; 17, interconnection structure; 18, conductive connecting piece;

[0026] A, length direction; B, width direction. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and the following description is made with reference to Figures 1-5 The battery module 100 according to the embodiment of the present application is described, comprising: a plurality of battery strings 10. The battery string 10 has a length direction A and a width direction B.

[0028] Specifically, as shown in Figures 1-5 the plurality of battery strings 10 include at least one first battery string 11 and at least one second battery string 12, the first battery string 11 and the second battery string 12 are opposite in polarity at one end adjacent to each other; the first battery string 11 includes at least one first battery piece 13, the first battery piece 13 is formed with at least one first chamfer 15, the second battery string 12 includes at least one second battery piece 14, the second battery piece 14 is formed with at least one second chamfer 16, the first chamfer 15 is arranged at one end of the first battery piece 13 along the length direction A of the battery string 10, and the second chamfer 16 is arranged at the other end of the second battery piece 14 along the length direction A of the battery string 10.

[0029] In combination Figures 1-4 , the first battery string 11 and the second battery string 12 each include a plurality of battery pieces arranged in sequence along the length direction A of the battery string 10, and the plurality of battery pieces are connected to each other to form the battery string 10. The two side edges of the battery piece along the length direction A of the battery string 10 are respectively a first side edge and a second side edge. At least one first battery piece 13 is included in the plurality of battery pieces in the first battery string 11, and at least one first chamfer 15 is formed on the first side edge of the first battery piece 13 along the length direction A of the battery string 10. At least one second battery piece 14 is included in the plurality of battery pieces in the second battery string 12, and at least one second chamfer 16 is formed on the second side edge of the second battery piece 14 along the length direction A of the battery string 10. Taking the positive electrode end of the first battery string 11 as an example, which is located at one end of the first battery string 11 on the same side of the first side edge of the first battery piece 13 along the length direction A, the negative electrode end of the second battery string 12 is located at one end adjacent to one end of the first battery string 11. Correspondingly, the positive electrode end of the second battery string 12 is located at the other end of the second battery string 12 on the same side of the second side edge of the second battery string 12 along the length direction A, and the negative electrode end of the other end of the second battery string 12 is located at the other end of the first battery string 11.

[0030] According to the battery assembly 100 of the embodiment of the utility model, at least one first battery piece 13 provided with a first chamfer 15 is included in the first battery string 11, and at least one second battery piece 14 provided with a second chamfer 16 is included in the second battery string 12, the arrangement of the first battery piece 13 and the second battery piece 14 facilitates the quick identification of the polarity of the battery string 10, facilitates the arrangement of the battery piece and the connection between the battery string 10, ensures that the connection end of the adjacent battery string 10 has opposite polarity, ensures that the current can correctly flow from one battery string 10 to another battery string 10, avoids misplacement of the layout, simplifies the assembly process of the battery assembly 100, and improves the processing efficiency of the battery assembly 100.

[0031] According to some embodiments of the utility model, as Figures 1-5As shown, the first battery string 11 includes a plurality of first battery pieces 13, at least one first chamfer 15 is formed on each of the plurality of first battery pieces 13, and the first chamfer 15 is arranged on the same side of the first battery piece 13 along the length direction A of the battery string 10, that is, the first chamfer 15 of each of the plurality of first battery pieces 13 in the first battery string 11 is located on the same side of the plurality of first battery pieces 13 along the length direction A of the first battery string 11; and / or, the second battery string 12 includes a plurality of second battery pieces 14, at least one second chamfer 16 is formed on each of the plurality of second battery pieces 14, and the second chamfer 16 is arranged on the same side of the second battery piece 14 along the length direction A of the battery string 10, that is, the second chamfer 16 of each of the plurality of second battery pieces 14 in the second battery string 12 is located on the same side of the plurality of second battery pieces 14 along the length direction A of the second battery string 12.

[0032] Therefore, by arranging the first chamfer 15 on one side of the first battery piece 13 and the second chamfer 16 on the other side of the second battery piece 14, the polarity of each end of the battery string 10 can be quickly identified, which helps to avoid incorrect connection during assembly. The consistency of the position of the first chamfer 15 on the plurality of first battery pieces 13 and the consistency of the position of the second chamfer 16 on the plurality of second battery pieces 14 makes the arrangement between the battery pieces more orderly, which helps to simplify the assembly process of the entire battery assembly 100. The consistent chamfer design can improve the assembly efficiency and reduce the time waste caused by incorrect positioning. Through the clear chamfer design, the problems caused by human error during production can be reduced, and the quality of the finished product can be improved.

[0033] According to some embodiments of the present application, as shown in Figures 1-4 As shown, the first battery string 11 is a plurality of, the second battery string 12 is a plurality of, the plurality of first battery strings 11 and the plurality of second battery strings 12 are arranged alternately along the width direction B of the battery string 10, and the first battery string 11 and the second battery string 12 extend along the length direction A of the battery string 10; the same end of the adjacent first battery string 11 and the second battery string 12 along the length direction A is connected to each other.

[0034] The plurality of first battery strings 11 and the plurality of second battery strings 12 are arranged alternately and spaced along the width direction B, and the first battery string 11 and the second battery string 12 extend along the length direction A. One end of the first battery string 11 is connected to one end of an adjacent second battery string 12, and the other end of the first battery string 11 is connected to the other end of another adjacent second battery string 12, which ensures that the current can flow smoothly from one battery string 10 to another battery string 10, forming a continuous circuit.

[0035] Thus, by alternately arranging the first battery string 11 and the second battery string 12 along the width direction B, the space can be effectively utilized, and the overall layout of the battery assembly 100 is more compact. Connecting adjacent battery strings 10 at the same end can simplify the connection process and reduce the complexity of wiring. Connecting adjacent battery strings 10 at the same end can ensure that the polarity of the connection end is correct, thereby ensuring that the current can flow smoothly from one battery string 10 to another battery string 10, forming a continuous circuit.

[0036] According to some embodiments of the present application, as shown in Figures 1-4 The end of the battery string 10 adjacent to the first chamfer 15 and / or the second chamfer 16 is the positive electrode, and the other end of the battery string 10 away from the first chamfer 15 and / or the second chamfer 16 is the negative electrode.

[0037] In some embodiments, the end of the battery string 10 adjacent to the chamfer is the positive electrode, and the other end of the battery string 10 away from the chamfer is the negative electrode. Alternatively, the end of the battery string 10 adjacent to the chamfer is the negative electrode, and the other end of the battery string 10 away from the chamfer is the positive electrode.

[0038] Thus, the arrangement of the chamfer can make the polarity identification of the battery string 10 more intuitive, facilitate the assembly of the battery string 10, and effectively improve the processing efficiency of the battery assembly 100.

[0039] According to some embodiments of the present application, as shown in Figures 1-4 Further comprising: an interconnection structure 17 connected with the grid lines on the battery sheet, the interconnection structure extending along the length direction A of the battery string 10, and the interconnection structure 17 at both ends of the battery string 10 in the length direction A is connected with the first battery string 11 and the second battery string 12 adjacent to the interconnection structure at one end respectively; and the interconnection structure 17 is in contact with the chamfer formed by at least one of the plurality of first battery sheets 13 and / or the second battery sheets 14.

[0040] The interconnection structure 17 is adapted to be connected with the grid lines to collect the current on the grid lines, and the plurality of battery sheets of the first battery string 11 are connected through the interconnection structure 17 to form a continuous electrical path. Taking two adjacent first battery sheets 13 as an example, one end of the interconnection structure is connected with one first battery sheet 13, the interconnection structure 17 is connected with another first battery sheet 13, and the side surface of the interconnection structure is in contact with the first side edge of one battery sheet along the length direction A.

[0041] Thus, during the lamination process of the photovoltaic assembly, the battery sheet is subjected to extrusion, and the side edge of the battery sheet in contact with the interconnection structure 17 is easily cracked under the pressure from the interconnection structure. The first chamfer 15 is provided on the first side edge, and the first chamfer 15 can play a role in dispersing stress, thereby improving the structural strength of the side edge of the battery sheet, reducing the risk of damage to the battery sheet, and improving the reliability of the battery assembly 100.

[0042] According to some embodiments of the present application, as shown in Figures 1-4 The conductive connecting piece 18 is arranged at the same end of the first battery string 11 and the second battery string 12 with opposite polarities, and the conductive connecting piece 18 is connected with the interconnecting structure of the first battery string 11 and the second battery string 12 with opposite polarities respectively.

[0043] One end of the conductive connecting piece 18 is connected with the positive pole of the first battery string 11, and the other end of the conductive connecting piece 18 is connected with the negative pole of the second battery string 12. Alternatively, one end of the conductive connecting piece 18 is connected with the negative pole of the first battery string 11, and the other end of the conductive connecting piece 18 is connected with the positive pole of the second battery string 12.

[0044] Therefore, the conductive connecting piece 18 is connected with the interconnecting structure of the first battery string 11 and the second battery string 12 respectively, so as to ensure that the current can flow between the adjacent battery strings 10. By arranging the conductive connecting piece 18 at the end with opposite polarities of the first battery string 11 and the second battery string 12, the correct polarity connection is ensured, and the electrical failure is avoided. The design of the conductive connecting piece 18 improves the reliability of the entire battery assembly 100 and reduces the possibility of connection errors and electrical failures.

[0045] According to some embodiments of the present application, as shown in Figure 5 The adjacent three first battery pieces 13 and / or second battery pieces 14 of the same battery string 10 are three cut pieces of the same battery piece.

[0046] The first battery piece 13 and the second battery piece 14 can be cut from the same complete battery piece. For example, at this time, the first battery piece 13 and the second battery piece 14 can be one third of the same complete battery piece. Alternatively, the first battery piece 13 and the second battery piece 14 can be cut from different complete battery pieces, and the first battery piece 13 and the second battery piece 14 are edge pieces after cutting of the complete battery pieces.

[0047] Therefore, when the battery piece adopts three pieces, the current on the first battery piece 13 and the second battery piece 14 is 1 / 3, the circuit damage power is P=I²R, the current on the first battery piece 13 and the second battery piece 14 is reduced, the circuit loss is reduced, the current transmission efficiency of the battery assembly 100 can be improved, and the lower current can reduce the hot spot risk of the battery piece and improve the safety of the battery assembly 100. Because the circuit loss is small, the number of grid lines required to be arranged on the first battery piece 13 and the second battery piece 14 formed by adopting three pieces is reduced, the shielding of the grid lines to the front of the battery piece can be reduced, and the photoelectric conversion efficiency of the battery piece is improved.

[0048] According to some embodiments of the present application, as shown in Figures 1-4As shown, the first battery piece 13 is provided with a plurality of grid lines on at least one side of the thickness direction of the battery string 10, and the plurality of grid lines are arranged on both sides of the first battery piece 13 and / or the second battery piece 14 along the thickness direction of the battery string 10; or, the plurality of grid lines are arranged on one side of the first battery piece 13 and / or the second battery piece 14 along the thickness direction of the battery string 10.

[0049] In some embodiments, in combination with Figure 1 and Figure 2 , the battery piece is provided with grid lines on both sides along the thickness direction, and the two sides of the battery piece along the thickness direction are respectively a first side and a second side; the grid lines arranged on the first side are all positive grid lines, and the grid lines arranged on the second side are all negative grid lines. One end of the interconnection structure 17 between the two adjacent battery pieces is connected with the positive grid line of the first side of one battery piece, and the other end of the interconnection structure 17 is connected with the negative grid line of the second side of the other battery piece; and the plurality of battery pieces in the battery string 10 are arranged in sequence with the plurality of interconnection structures 17. One end of the interconnection structure 17 at the end of the battery string 10 along the length direction A is connected with the positive grid line of the battery piece at the end, and the other end of the interconnection structure 17 extends out of the battery piece along the length direction A to form a positive electrode of the battery string 10; and one end of the interconnection structure 17 at the other end of the battery string 10 along the length direction A is connected with the negative grid line of the battery piece at the end, and the other end of the interconnection structure 17 extends out of the battery piece along the length direction A to form a negative electrode of the battery string 10.

[0050] In some embodiments, in combination with Figure 3 and Figure 4 , the battery piece is provided with grid lines on one side along the thickness direction, and the other side is not provided with grid lines. The grid lines include positive grid lines and negative grid lines, and the adjacent battery pieces are connected through a plurality of interconnection structures 17; one end of the interconnection structure 17 is connected with the positive grid line on the surface of one battery piece, and the other end of the interconnection structure 17 is connected with the negative grid line on the surface of the adjacent battery piece. One end of the interconnection structure 17 at the end of the battery string 10 along the length direction A is connected with the positive grid line of the battery piece at the end, and the other end of the interconnection structure 17 extends out of the battery piece along the length direction A to form a positive electrode of the battery string 10; and one end of the interconnection structure 17 at the other end of the battery string 10 along the length direction A is connected with the negative grid line of the battery piece at the end, and the other end of the interconnection structure 17 extends out of the battery piece along the length direction A to form a negative electrode of the battery string 10.

[0051] Therefore, the setting position of the chamfer on the battery piece in the adjacent battery string 10 helps to quickly identify the polarity of the two ends of the battery string 10, and ensures that the polarity is correct when the battery strings 10 are connected, thereby improving the reliability of the battery assembly 100.

[0052] According to some embodiments of the present application, as Figure 5As shown, at least one first cell piece 13 and at least one second cell piece 14 comprise: a cut surface and a non-cut surface, the non-cut surface is arranged outside the cut surface, and the non-cut surface is formed with at least one chamfer.

[0053] The cut surface refers to a surface formed by cutting in the process of manufacturing the cell piece, and the surface usually has a certain roughness or irregularity, and the cut surface is prone to cracking. The non-cut surface is arranged outside the cut surface, that is, in the outer position of the cell piece relative to the cut surface. The non-cut surface is usually relatively flat, and at least one chamfer is formed on the surface.

[0054] Therefore, the chamfer is formed on the non-cut surface, the structural strength of the non-cut surface is high, and the non-cut surface is suitable for contacting the interconnection structure 17, so as to reduce the risk of cracking of the cell piece during the lamination process and improve the reliability of the cell piece.

[0055] According to the photovoltaic module of the second aspect of the present application, the battery module 100 in the above embodiment is applied, so that the structural reliability of the photovoltaic module can be effectively improved, and the production efficiency of the photovoltaic module can be improved.

[0056] According to the photovoltaic module of the present application, the battery module 100 in the above embodiment is applied, so that the structural reliability of the photovoltaic module can be effectively improved, and the production efficiency of the photovoltaic module can be improved.

[0057] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] In the description of the present application, "first feature" and "second feature" can include one or more features. In the description of the present application, "a plurality of" means two or more. In the description of the present application, "above" or "below" of the first feature to the second feature can include direct contact of the first and second features, or can include indirect contact of the first and second features through another feature therebetween. In the description of the present application, "above", "above" and "above" of the first feature to the second feature include the first feature directly above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height.

[0059] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example.

[0060] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery assembly, comprising: The battery assembly comprises: a plurality of battery strings, the plurality of battery strings comprising at least one first battery string and at least one second battery string, the first battery string and the second battery string being opposite in polarity at one end adjacent to each other; the first battery string comprises at least one first battery sheet, the first battery sheet being formed with at least one first chamfer, the second battery string comprises at least one second battery sheet, the second battery sheet being formed with at least one second chamfer, the first chamfer is arranged at one end of the first battery sheet along the length direction of the battery string, and the second chamfer is arranged at the other end of the second battery sheet along the length direction of the battery string.

2. The battery assembly according to claim 1, wherein the first battery string comprises a plurality of first battery sheets, and at least one first chamfer is formed on each of the plurality of first battery sheets, the first chamfers being arranged on the same side of the first battery sheets along the length direction of the battery string; and / or the second battery string comprises a plurality of second battery sheets, and at least one second chamfer is formed on each of the plurality of second battery sheets, the second chamfers being arranged on the same side of the second battery sheets along the length direction of the battery string.

3. The battery assembly of claim 2, wherein, The first battery string is a plurality of, and the second battery string is a plurality of, the plurality of first battery strings and the plurality of second battery strings being arranged alternately along the width direction of the battery string, the first battery string and the second battery string extending along the length direction of the battery string; adjacent first battery strings and second battery strings are connected to each other at the same end along the length direction.

4. The battery assembly of claim 1, wherein, The end of the battery string adjacent to the first chamfer and / or the second chamfer is the positive electrode; the other end of the battery string away from the first chamfer and / or the second chamfer is the negative electrode.

5. The battery assembly of claim 1, wherein, Further comprising: interconnection structure, the interconnection structure being connected with the grid lines on the battery sheet, the interconnection structure extending along the length direction of the battery string, and the interconnection structure at both ends of the second battery string along the length direction of the battery string being connected with the first battery string and the second battery string adjacent to the interconnection structure at one end of the interconnection structure, respectively; the interconnection structure being in contact with the chamfer formed by at least one of the plurality of first battery sheets and / or the second battery sheets.

6. The battery assembly of claim 5, wherein, Further comprising: a conductive connecting member arranged at the same end of the first battery string and the second battery string opposite in polarity, the conductive connecting member being connected with the interconnection structure opposite in polarity of the first battery string and the second battery string, respectively.

7. The battery assembly of claim 1, wherein, The adjacent three first battery sheets and / or second battery sheets of the same battery string are three slices of the same battery sheet.

8. The battery assembly of claim 1, wherein, The first battery sheet is formed with a plurality of grid lines on at least one side along the thickness direction of the battery string, a plurality of grid lines are arranged on both sides of the first battery sheet and / or the second battery sheet along the thickness direction of the battery string; or a plurality of grid lines are arranged on one side of the first battery sheet and / or the second battery sheet along the thickness direction of the battery string.

9. The battery assembly of any one of claims 1-8, wherein, The at least one first battery sheet and the at least one second battery sheet comprise: a cutting surface; a non-cutting face, disposed outside of the cutting face, the non-cutting face formed with at least one of the chamfers.

10. A photovoltaic module, characterized by, A battery assembly comprising the battery assembly according to any one of claims 1-9.

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