Battery assembly and photovoltaic system

What is AI technical title?
AI technical title is built by Patsnap AI team. It summarizes the technical point description of the patent document.
By designing chamfered ends and cross-arranging the cells in the overlapping area and setting up back busbars, the problems of microcracks and corner breakage caused by stress concentration in the cells were solved, thereby improving the power density and power generation efficiency of the battery module.

CN223859553UActive Publication Date: 2026-01-30TIANJIN AIKO SOLAR ENERGY TECH CO LTD

View PDF 0 Cites 0 Cited by

Patent Information

Application Number: CN202522306307.0
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2025-10-31
Publication Date: 2026-01-30
Estimated Expiration: 2035-10-31

AI Technical Summary

Technical Problem

In the overlapping areas of solar cells, stress concentration caused by the superposition of multiple layers leads to problems such as microcracks and chipping of the cut edges.

Method used

By placing the cut ends of the solar cells on the chamfered ends of adjacent solar cells and making the chamfered ends of the solar cell strings face opposite directions to form a cross arrangement, the stress concentration at the cut ends is avoided. At the same time, busbars are installed on the back of the solar cells to avoid series or parallel mismatch.

Benefits of technology

It effectively avoids microcracks and corner breakage of the battery cells, improves the power density of the battery module, and avoids power loss caused by series or parallel mismatch.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN223859553U_ABST

Patent Text Reader

Abstract

The utility model relates to the technical field of solar cells, and particularly discloses a cell assembly and a photovoltaic system, the cell assembly comprises a plurality of cell sheets, the cell sheets are provided with chamfering ends and cutting ends along a first direction, at least one side of each chamfering end is provided with a chamfer, and the cell sheets are provided with light receiving surfaces and backlight surfaces along a third direction; the plurality of battery pieces are arranged along a first direction and are partially overlapped to form a first battery string, and the battery piece cutting ends on the first battery string are lapped on the chamfered ends of the light receiving surfaces of the adjacent battery pieces; the plurality of battery pieces are arranged along the first direction and partially overlapped to form a second battery string, and the chamfered ends of the battery pieces on the second battery string are lapped on the cutting ends of the light receiving surfaces of the adjacent battery pieces; the chamfer ends of the first battery string and the second battery string face opposite directions; the first battery string and the second battery string are partially overlapped along the second direction, and the first battery string is arranged on the light receiving surface of the second battery string. And hidden cracks of the battery piece and corner falling of cutting edges caused by stress concentration of the battery piece area are avoided.

Need to check novelty before this filing date? Find Prior Art

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell technology field especially relates to a battery assembly and photovoltaic system. BACKGROUND

[0002] The solar cell pieces are closely arranged and even stacked together, so that the power density of the photovoltaic assembly as a whole can be improved.

[0003] However, when the full-screen assembly is overlapped in string and string, the stress of the cell piece in the area where the string and the piece are overlapped at the same time is obviously greater than that in other positions due to the superposition of the multi-layer structure, which causes the hidden cracking of the cell piece and even the corner drop of the cutting edge of the cell piece. UTILITARY MODEL

[0004] The utility model provides a battery assembly to avoid the hidden cracking of the cell piece and the corner drop of the cutting edge caused by the stress concentration of the cell piece area.

[0005] To solve the above technical problems, the utility model provides a battery assembly, which comprises a plurality of cell pieces, along a first direction, the cell piece has a chamfered end and a cutting end, at least one side of the chamfered end has a chamfer, along a third direction, the cell piece has a light receiving surface and a back light surface.

[0006] A plurality of the cell pieces are arranged along the first direction and partially overlapped to form a first cell string, and the cutting end of the cell piece on the first cell string is arranged on the chamfered end of the light receiving surface of the adjacent cell piece.

[0007] A plurality of the cell pieces are arranged along the first direction and partially overlapped to form a second cell string, and the chamfered end of the cell piece on the second cell string is arranged on the cutting end of the light receiving surface of the adjacent cell piece.

[0008] The chamfered ends of the first cell string and the second cell string are opposite to each other.

[0009] The first cell string and the second cell string are partially overlapped along a second direction, and the first cell string is arranged on the light receiving surface of the second cell string.

[0010] The first direction is crosswise arranged with the second direction and the third direction.

[0011] As an improvement of the above scheme, the first cell string and the second cell string are connected in series or in parallel.

[0012] As an improvement of the above scheme, the cell piece is a half cell piece cut from a whole cell piece.

[0013] As an improvement of the above-mentioned scheme, the first battery string comprises a first battery piece and a second battery piece, and the cut end of the first battery piece is arranged on the chamfered end of the second battery piece.

[0014] The second battery string comprises a third battery piece and a fourth battery piece, and the chamfered end of the third battery piece is arranged on the cut end of the fourth battery piece.

[0015] The battery piece further comprises a side edge, and the side edge is connected to the chamfered end and the cut end respectively, and the side edge of the second battery piece is arranged on the fourth battery piece, and the side edge of the first battery piece is arranged on the third battery piece.

[0016] As an improvement of the above-mentioned scheme, the cut end of the battery piece is provided with a cut edge, the chamfered end of the second battery piece is pressed on the side edge of the fourth battery piece, and the chamfered end of the third battery piece is pressed on the cut edge of the fourth battery piece.

[0017] As an improvement of the above-mentioned scheme, the cut end of the battery piece is provided with a cut edge, the cut edge of the first battery piece is pressed on the chamfered end of the second battery piece, and the side edge of the first battery piece is pressed on the chamfered end of the third battery piece.

[0018] As an improvement of the above-mentioned scheme, the side length of the chamfered end is 1.0-3.5 mm.

[0019] As an improvement of the above-mentioned scheme, the chamfered end of the battery piece is provided with a chamfered edge, and the included angle between the chamfered end and the chamfered edge is 100°-160°.

[0020] As an improvement of the above-mentioned scheme, along the first direction, the width of the local overlap between the battery pieces is 0.5-3.0 mm.

[0021] As an improvement of the above-mentioned scheme, along the second direction, the width of the local overlap between the first battery string and the second battery string is 0.5-2 mm.

[0022] As an improvement of the above-mentioned scheme, the ratio of the width of the local overlap between the first battery string and the second battery string to the width of the local overlap between the battery pieces in the first direction is 0.7:1.5.

[0023] As an improvement of the above-mentioned scheme, the battery piece is provided with a fine grid line extending along the second direction, and the distance between the fine grid line closest to the cut edge and the cut edge is 0.2-1.5 mm.

[0024] As an improvement of the above scheme, the chamfered end of the battery piece has a chamfered edge, and the battery piece is provided with thin grid lines extending along the second direction, and the distance between the thin grid line closest to the chamfered edge and the chamfered edge is 0.2-1.5 mm.

[0025] As an improvement of the above scheme, a plurality of the battery pieces are arranged along the first direction and partially overlap to form a third battery string, and the cut end of the battery piece on the third battery string is arranged on the chamfered end of the adjacent battery piece;

[0026] Along the second direction, the third battery string is arranged adjacent to the first battery string, and the third battery string has a string distance with the first battery string; or

[0027] The third battery string is arranged adjacent to the second battery string, and the third battery string has a string distance with the second battery string.

[0028] As an improvement of the above scheme, a plurality of the battery pieces are arranged along the first direction and partially overlap to form a fourth battery string, and the chamfered end of the battery piece on the fourth battery string is arranged on the cut end of the adjacent battery piece;

[0029] The chamfered ends of the third battery string and the fourth battery string face in opposite directions;

[0030] The third battery string and the fourth battery string partially overlap along the second direction, and the third battery string is arranged on the fourth battery string.

[0031] As an improvement of the above scheme, a plurality of the battery pieces are arranged along the first direction and partially overlap to form a third battery string, and the chamfered end of the battery piece on the third battery string is arranged on the cut end of the adjacent battery piece;

[0032] Along the second direction, the third battery string is arranged adjacent to the first battery string, and the third battery string has a string distance with the first battery string; or

[0033] The third battery string is arranged adjacent to the second battery string, and the third battery string has a string distance with the second battery string.

[0034] As an improvement of the above scheme, a plurality of the battery pieces are arranged along the first direction and partially overlap to form a fourth battery string, and the cut end of the battery piece on the fourth battery string is arranged on the chamfered end of the adjacent battery piece;

[0035] The chamfered ends of the third battery string and the fourth battery string face in opposite directions;

[0036] The third battery string and the fourth battery string are partially overlapped along the second direction, and the fourth battery string is arranged on the third battery string.

[0037] As an improvement of the above-mentioned scheme, a plurality of the battery pieces are arranged along the first direction and partially overlapped to form a third battery string, and the chamfered end of the battery piece on the third battery string is arranged on the cut end of the adjacent battery piece.

[0038] Along the second direction, the second battery string and the third battery string are arranged on opposite sides of the first battery string, the first battery string and the third battery string are partially overlapped, and the first battery string is arranged on the third battery string.

[0039] As an improvement of the above-mentioned scheme, the first battery string and the second battery string further comprise bus bars for connecting two battery strings in series or parallel, the bus bars are arranged on the back of the battery pieces corresponding to the first battery string and the second battery string, and an insulating strip is arranged between the bus bar and the back of the battery piece.

[0040] As an improvement of the above-mentioned scheme, the bus bar comprises a plurality of intermediate bus bars arranged along the second direction, the battery strings arranged along the first direction form a parallel battery string group through the intermediate bus bars, the chamfered ends of the battery strings on the same parallel battery string group are oriented in the same direction, and the cut ends of the battery pieces of the same parallel battery string group are arranged on the chamfered ends of the adjacent battery pieces; or the chamfered ends of the battery pieces of the same parallel battery string group are arranged on the cut ends of the adjacent battery pieces.

[0041] In addition, the utility model still provides a photovoltaic system, it includes above-mentioned battery assembly.

[0042] Implementing the utility model has the following beneficial effects:

[0043] The utility model discloses a battery assembly, through the battery piece cutting end of first battery string is set on the chamfered end of adjacent battery piece light receiving surface, the chamfered end of battery piece of second battery string is set on the cutting end of adjacent battery piece light receiving surface, makes the chamfered end of first battery string and second battery string be opposite, and first battery string, second battery string is partially overlapped along second direction, the first battery string is set on the light receiving surface of second battery string, so that the corner position of cutting end no longer is subjected to the normal pressure of other battery piece, avoids the cutting end of battery piece to appear multilayer superposition part, further avoids the cutting end of battery piece to take place hidden crack even the corner phenomenon, furthermore, the piece interlaced of first battery string, second battery string, the interlaced structure of string avoids the situation that first battery string and second battery string appear series mismatch or parallel mismatch, further avoids the power loss caused by series mismatch or parallel mismatch, can help to promote the power density of battery assembly whole. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is the front structure schematic diagram of an embodiment of the utility model kind of battery assembly;

[0045] Figure 2 It is the structure schematic diagram of battery piece;

[0046] Figure 3 It is the front structure schematic diagram of the second embodiment of the utility model kind of battery assembly;

[0047] Figure 4 It is Figure 3 A part enlarged structure schematic diagram of;

[0048] Figure 5 It is Figure 3 B part enlarged structure schematic diagram of;

[0049] Figure 6 It is Figure 5 D part enlarged structure schematic diagram of;

[0050] Figure 7 It is Figure 3 C part enlarged structure schematic diagram of;

[0051] Figure 8 It is Figure 3 Back structure schematic diagram of;

[0052] Figure 9 It is Figure 8 E part enlarged structure schematic diagram of;

[0053] Figure 10 It is the front structure schematic diagram of the third embodiment of the utility model kind of battery assembly;

[0054] Figure 11 is Figure 10 a F part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0055] Figure 12 is Figure 10 a G part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0056] Figure 13 is Figure 10 a H part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0057] Figure 14 is a front structure schematic view of a fourth embodiment of the battery assembly of the utility model;

[0058] Figure 15 is Figure 14 an I part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0059] Figure 16 is Figure 14 a J part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0060] Figure 17 is Figure 14 a K part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0061] Figure 18 is Figure 14 an L part enlarged structural schematic view of the embodiment 1 of the battery assembly;

[0062] Figure 19 is Figure 14 a back structure schematic view of the embodiment 1 of the battery assembly;

[0063] Figure 20 is Figure 19 an M part enlarged structural schematic view of the embodiment 1 of the battery assembly. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings to make the utility model further detailed description.

[0065] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings to make the utility model further detailed description. The example of the embodiment is shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar function throughout. The embodiment described below by referring to the drawings is exemplary, and is only used to explain the utility model, and can not be understood as the limitation of the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model, and can not be used to limit the utility model.

[0066] In the description of the utility model, the terms "first", "second" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of", "several" is two or more than two, unless otherwise specifically limited.

[0067] First, referring to Figure 1 、 Figure 2 The utility model provides an embodiment of battery assembly, including a plurality of battery piece 1, along the first direction, the opposite ends of battery piece 1 are chamfered end 11 and cutting end 12 respectively, at least one side of chamfered end 11 has chamfer 111, along the third direction, battery piece 1 has light receiving surface and back light surface;A plurality of battery piece 1 is arranged along the first direction and partially overlaps and forms first battery string 100, and the cutting end 12 of the back light surface of the battery piece 1 on the first battery string 100 is arranged on the chamfered end 11 of the light receiving surface of the adjacent battery piece 1;A plurality of battery piece 1 is arranged along the first direction and partially overlaps and forms second battery string 200, and the chamfered end 11 of the back light surface of the battery piece 1 on the second battery string 200 is arranged on the cutting end 12 of the light receiving surface of the adjacent battery piece 1;The chamfered end 11 of first battery string 100 and second battery string 200 is opposite;First battery string 100, second battery string 200 partially overlaps along the second direction, and the back light surface of first battery string 100 is arranged on the light receiving surface of second battery string 200;The first direction and the second direction, the third direction are all cross arrangement.

[0068] The embodiment is by cutting end 12 of battery piece 1 on first battery string 100 cutting end 12 is arranged on the chamfered end 11 of the light receiving surface of the adjacent battery piece 1, and the chamfered end 11 of the battery piece 1 on second battery string 200 is arranged on the cutting end 12 of the light receiving surface of the adjacent battery piece 1, so that the chamfered end 11 of first battery string 100 and second battery string 200 is opposite, and first battery string 100, second battery string 200 partially overlaps along the second direction, and first battery string 100 is arranged on the light receiving surface of second battery string 200, so that the corner position of cutting end 12 is no longer subjected to the normal pressure of other battery piece 1, avoid the part of cutting end 12 of battery piece 1 to appear multilayer superposition, further avoid the cutting end 12 of battery piece 1 to occur hidden crack even drop angle phenomenon;In addition, the piece interlaced structure of first battery string 100 and second battery string 200 avoids the situation that first battery string 100 and second battery string 200 appear series mismatch or parallel mismatch, further avoid the power loss caused by series mismatch or parallel mismatch, can help to improve the power density of battery assembly as a whole.

[0069] It should be noted that the front of the battery piece 1 is the light receiving surface of the battery piece 1, and the front of the battery piece 1 in this embodiment is arranged upward, that is, the light receiving surface of the battery piece 1 is arranged upward, and the back light surface of the battery piece 1 is arranged downward. The cut end 12 of the battery piece 1 on the first battery string 100 is arranged on the chamfered end 11 of the adjacent battery piece 1, the chamfered end 11 of the battery piece 1 on the second battery string 200 is arranged on the cut end 12 of the adjacent battery piece 1, and the first battery string 100 is arranged on the second battery string 200. The stacking relationship is when viewed from the front of the battery assembly.

[0070] The types of battery pieces 1 in this application include but are not limited to back contact batteries, tunnel oxide passivation contact batteries, heterojunction batteries, passivated emitter back contact batteries, or perovskite batteries, etc. Among them, the battery piece 1 can be a back contact battery. For the back contact battery, the emitter, the surface field and the metal electrode are all arranged on the back of the battery piece 1, and the front of the battery piece 1 is not blocked by the metal electrode, so that the battery can receive more incident light, reduce optical loss and improve photoelectric conversion efficiency.

[0071] The battery piece 1 used in this embodiment is a half battery piece 1 cut from a whole battery piece 1. The half battery piece 1 has a cut end 12 and a chamfered end 11 arranged oppositely, the cut end 12 of the half battery piece 1 has a cut edge 121 and right angles at both ends of the cut edge 121, the chamfered end 11 has a chamfered edge 112 and chamfers 111 at both ends of the chamfered edge 112, and the chamfered edge 112 is approximately parallel to the cut edge 121. For the half battery piece 1 cut from the whole battery piece 1, if the distance between the cut end 12 closest to the cut edge 121 and the cut edge 121 is d1, and the distance between the chamfered end 11 closest to the chamfered edge 112 and the chamfered edge 112 is d2, then d1>d2.

[0072] The first battery string 100 and the second battery string 200 in this embodiment can be connected in series or in parallel. For the first battery string 100 and the second battery string 200, a bus bar is further provided for connecting the two battery strings in series or in parallel. Since the battery piece 1 in this embodiment is preferably a back contact battery, the bus bar can be further arranged on the back of the battery piece 1 corresponding to the first battery string 100 and the second battery string 200, and an insulating strip is arranged between the bus bar and the back of the battery piece 1. Arranging the bus bar on the back of the battery piece 1, that is, the back light surface, hides the bus bar, and the light receiving area of the battery piece 1 is not occupied by the bus bar, which helps to improve the power generation efficiency and the beauty of the layout of the battery assembly.

[0073] When the first battery string 100 is connected in series with the second battery string 200, because the cutting end 12 of one of the two adjacent battery pieces 1 of the first battery string 100 is arranged on the chamfered end 11 of the other battery piece 1, and the chamfered end 11 of one of the two adjacent battery pieces 1 of the second battery string 200 is arranged on the cutting end 12 of the other battery piece 1, the number of fine grid lines blocked on the second battery string 200 is less, i.e. the number of grid lines capable of converting light energy into electrical energy on the second battery string 200 is more, so the effective light receiving area of the first battery string 100 is smaller than that of the second battery string 200; and the first battery string 100 is arranged on the second battery string 200, so part of the area of the second battery string 200 is blocked by the first battery string 100, thereby making the actual light receiving area of the first battery string 100 close to that of the second battery string 200, the current generated by the first battery string 100 is close to that generated by the second battery string 200, and the problem of series mismatch does not occur.

[0074] When the first battery string 100 is connected in parallel with the second battery string 200, because the cutting end 12 of one of the two adjacent battery pieces 1 of the first battery string 100 is arranged on the chamfered end 11 of the other battery piece 1, and the chamfered end 11 of one of the two adjacent battery pieces 1 of the second battery string 200 is arranged on the cutting end 12 of the other battery piece 1, the number of fine grid lines blocked on the second battery string 200 is less, i.e. the number of grid lines capable of converting light energy into electrical energy on the second battery string 200 is more, so the effective light receiving area of the first battery string 100 is smaller than that of the second battery string 200; and the first battery string 100 is arranged on the second battery string 200, so part of the area of the second battery string 200 is blocked by the first battery string 100, thereby making the actual light receiving area of the first battery string 100 close to that of the second battery string 200, the voltage generated by the first battery string 100 is close to that generated by the second battery string 200, and the problem of parallel mismatch does not occur.

[0075] Specifically, the first battery string 100 includes the first battery piece 10 and the second battery piece 20, and the cut end 12 of the first battery piece 10 is arranged on the chamfered end 11 of the second battery piece 20; the second battery string 200 includes the third battery piece 30 and the fourth battery piece 40, and the chamfered end 11 of the third battery piece 30 is arranged on the cut end 12 of the fourth battery piece 40; the battery piece 1 further includes a side edge 13, the side edge 13 is connected to the chamfered end 11 and the cut end 12 at two ends respectively, the side edge 13 of the second battery piece 20 is arranged on the fourth battery piece 40, and the side edge 13 of the first battery piece 10 is arranged on the third battery piece 30. For the fourth battery piece 40, the second battery piece 20 and the third battery piece 30 are directly arranged thereon, specifically, the side edge 13 of the second battery piece 20 and the chamfered end 11 of the third battery piece 30 are arranged on the fourth battery piece 40, and the second battery piece 20 and the third battery piece 30 belong to different battery strings respectively, that is, the chamfered ends 11 of the second battery piece 20 and the third battery piece 30 face opposite directions, and the right-angle corner position of the fourth battery piece 40 can be avoided being pressed by the second battery piece 20 or the third battery piece 30; in addition, the first battery piece 10 is pressed on the second battery piece 20 and the third battery piece 30, specifically, the cut end 12 of the first battery piece 10 is pressed on the chamfered end 11 of the second battery piece 20, and the side edge 13 of the first battery piece 10 is arranged on the side edge 13 of the third battery piece 30, so that one of the right-angle corner positions of the first battery piece 10 is suspended, thereby avoiding the right-angle corner position of the fourth battery piece 40 being pressed and causing one of the right angles to be cracked or cornered.

[0076] For the battery piece 1, the fine grid lines of the battery piece 1 are arranged in the second direction, and the fine grid lines are approximately parallel to the cut edge 121 and the chamfered edge 112, wherein the distance between the fine grid line closest to the cut edge 121 and the cut edge 121 is 0.2-1.5 mm, and the distance between the fine grid line closest to the chamfered edge 112 and the chamfered edge 112 is 0.2-1.5 mm. For the chamfer 111 of the battery piece 1, the side length of the chamfer 111 in the embodiment is 1.0-3.5 mm, and the included angle between the chamfer 111 and the chamfered end 11 is 100°-160°. In the first direction, the width of the local overlap between the battery pieces 1 is 0.5-3.0 mm; in the second direction, the width of the local overlap between the first battery string 100 and the second battery string 200 is 0.5-2 mm. The ratio of the width of the local overlap between the first battery string 100 and the second battery string 200 to the width of the local overlap between the battery pieces 1 in the first direction is 0.7:1.5.

[0077] Preferably, the chamfer 111 of the second cell piece 20 presses on the side edge 13 of the fourth cell piece 40, and the chamfer 111 of the third cell piece 30 presses on the cutting edge 121 of the fourth cell piece 40, which on the one hand ensures that the right-angle corner position of the fourth cell piece 40 is not pressed by the second cell piece 20 or the third cell piece 30, avoiding the right-angle corner position being cracked, and on the other hand can avoid the power density of the fourth cell piece 40 being reduced due to the area being blocked being too large.

[0078] More preferably, the cutting edge 121 of the first cell piece 10 presses on the chamfer 111 of the second cell piece 20, and the side edge 13 of the first cell piece 10 presses on the chamfer 111 of the third cell piece 30, so as to avoid the power density of the second cell piece 20 or the third cell piece 30 being reduced due to the area being blocked being too large.

[0079] In combination with the above, Figures 3 to 9 The utility model provides a second embodiment of a battery assembly, the battery assembly of this embodiment further comprises a third cell string 300. The third cell string 300 is formed by a plurality of cell pieces 1 arranged along a first direction and partially overlapped, and the cutting end 12 of the cell piece 1 on the third cell string 300 is arranged on the chamfer end 11 of the adjacent cell piece 1. Along a second direction, the third cell string 300 is arranged adjacent to the first cell string 100, and the third cell string 300 and the first cell string 100 have a string distance therebetween. Alternatively, the third cell string 300 is arranged adjacent to the second cell string 200, and the third cell string 300 and the second cell string 200 have a string distance therebetween. The chamfer end 11 of the third cell string 300 can be oriented in the same direction as the chamfer 111 of the first cell string 100, or in the same direction as the chamfer 111 of the second cell string 200. The third cell string 300 can be connected in series with the first cell string 100 and the second cell string 200, or can be connected in parallel. The string distance provided between the third cell string 300 and the adjacent first cell string 100 or second cell string 200 can avoid the first cell string 100 or the second cell string 200 being further blocked, thereby avoiding the problem of series mismatch or parallel mismatch.

[0080] The battery assembly of this embodiment further comprises a fourth cell string 400. A plurality of cell pieces 1 are arranged along a first direction and partially overlapped to form the fourth cell string 400, and the chamfer end 11 of the cell piece 1 on the fourth cell string 400 is arranged on the cutting end 12 of the adjacent cell piece 1. The chamfer end 11 of the third cell string 300 and the fourth cell string 400 is oriented in opposite directions. The third cell string 300 and the fourth cell string 400 are partially overlapped along a second direction, and the third cell string 300 is arranged on the fourth cell string 400. In this way, Figure 3The third battery string 300 is arranged adjacent to the second battery string 200, and the third battery string 300 and the second battery string 200 have a string distance therebetween, so as to avoid mutual influence of the third battery string 300 and the second battery string 200 on the light-receiving area and stress condition of the cell 1, and the inter-cell overlapping and inter-string overlapping structure of the third battery string 300 and the fourth battery string 400 can avoid the corner position of the cut end 12 of the cell 1 of the third battery string 300 and the fourth battery string 400 from being subjected to the normal pressure of other cells 1, so as to avoid the cut end 12 of the cell 1 from being cracked or even cornered, and meanwhile, the third battery string 300 and the fourth battery string 400 can avoid the series mismatch or parallel mismatch.

[0081] In addition, the fifth battery string 500 and the sixth battery string 600 can also be arranged in the second direction according to requirements. The fifth battery string 500 has the same structure as the third battery string 300, the sixth battery string 600 has the same structure as the fourth battery string 400, the chamfered end 11 of the fifth battery string 500 and the sixth battery string 600 faces opposite directions, the fifth battery string 500 and the sixth battery string 600 are partially overlapped in the second direction, the fifth battery string 500 is arranged on the sixth battery string 600, and the fifth battery string 500 is arranged adjacent to the fourth battery string 400 and has a string distance therebetween.

[0082] The bus bar of the embodiment includes a plurality of middle bus bars 2 arranged in the second direction, and at least two edge bus bars 3 arranged in the second direction. The battery strings arranged in the first direction form parallel battery string groups through the middle bus bars 2, the chamfered ends 11 of the battery strings on the same parallel battery string group face the same direction, and the cut end 12 of the cell 1 of the parallel battery string group is arranged on the chamfered end 11 of the adjacent cell 1, or the chamfered end 11 of the cell 1 is arranged on the cut end 12 of the adjacent cell 1. Adjacent two battery strings arranged in the second direction form a series battery string group through the edge bus bar 3, the adjacent two battery strings of the series battery string group are partially overlapped in the second direction, the cut end 12 of the cell 1 of one battery string is arranged on the chamfered end 11 of the adjacent cell 1, the chamfered end 11 of the cell 1 of the other battery string is arranged on the cut end 12 of the adjacent cell 1, and the chamfered ends 11 of the battery strings on the same series battery string group face opposite directions.

[0083] In combination Figures 10 to 13In the third embodiment, the battery assembly further comprises a third battery string 300 formed by a plurality of battery pieces 1 arranged along the first direction and partially overlapped, and the chamfered end 11 of the battery piece 1 on the third battery string 300 is arranged on the cut end 12 of the adjacent battery piece 1; along the second direction, the third battery string 300 is arranged adjacent to the first battery string 100, and the third battery string 300 and the first battery string 100 have a string distance therebetween; or the third battery string 300 is arranged adjacent to the second battery string 200, and the third battery string 300 and the second battery string 200 have a string distance therebetween. The chamfered end 11 of the third battery string 300 in this embodiment can be oriented in the same direction as the chamfered end 111 of the first battery string 100, or in the same direction as the chamfered end 111 of the second battery string 200. The third battery string 300 can be connected in series with the first battery string 100 and the second battery string 200, or can be connected in parallel. The string distance provided between the third battery string 300 and the adjacent first battery string 100 or second battery string 200 can avoid further shielding of the first battery string 100 or the second battery string 200, thereby avoiding problems of series mismatch or parallel mismatch.

[0084] The battery assembly of this embodiment further comprises a fourth battery string 400 formed by a plurality of battery pieces 1 arranged along the first direction and partially overlapped, and the cut end 12 of the battery piece 1 on the fourth battery string 400 is arranged on the chamfered end 11 of the adjacent battery piece 1; the chamfered end 11 of the third battery string 300 and the fourth battery string 400 is oriented in opposite directions; the third battery string 300 and the fourth battery string 400 are partially overlapped along the second direction, and the fourth battery string 400 is arranged on the third battery string 300. Figure 10 In the battery assembly shown, the third battery string 300 is arranged adjacent to the second battery string 200, and the third battery string 300 and the second battery string 200 have a string distance therebetween, thereby avoiding mutual influence of the third battery string 300 and the second battery string 200 on the light-receiving area and stress condition of the battery pieces 1, and the inter-piece overlapping and inter-string overlapping structure of the third battery string 300 and the fourth battery string 400 avoids the corner position of the cut end 12 of the battery piece 1 on the third battery string 300 and the fourth battery string 400 from being subjected to normal pressure from other battery pieces 1, thereby avoiding hidden cracking or even corner dropping of the cut end 12 of the battery piece 1, and avoiding series mismatch or parallel mismatch of the third battery string 300 and the fourth battery string 400.

[0085] In combination with Figures 14 to 20In the fourth embodiment, the plurality of battery pieces 1 are arranged along a first direction and partially overlapped to form a third battery string 300, and the chamfered end 11 of the battery piece 1 on the third battery string 300 is arranged on the cut end 12 of the adjacent battery piece 1; along a second direction, the second battery string 200 and the third battery string 300 are arranged on opposite sides of the first battery string 100, the first battery string 100 and the third battery string 300 are partially overlapped, and the first battery string 100 is arranged on the third battery string 300.

[0086] Specifically, the battery strings arranged along the first direction are formed into parallel battery string groups by the intermediate bus bar 2, the chamfered ends 11 of the battery strings in the same parallel battery string group are oriented in the same direction, and the cut ends 12 of the battery pieces 1 in the same parallel battery string group are arranged on the chamfered ends 11 of the adjacent battery pieces 1; or the chamfered ends 11 of the battery pieces 1 in the same parallel battery string group are arranged on the cut ends 12 of the adjacent battery pieces 1. Adjacent two battery strings arranged along the second direction are formed into a series battery string group by the edge bus bar 3, the chamfered ends 11 of some adjacent two battery strings are oriented in opposite directions, and the two adjacent battery strings are partially overlapped along the second direction and connected by the edge bus bar 3 to form a series battery string group, and the chamfered ends 11 of the other adjacent two battery strings are oriented in the same direction, and the two adjacent battery strings are provided with an inter-string distance along the second direction and connected by the edge bus bar 3 to form a series battery string group.

[0087] The first battery string 100 of the embodiment is connected in series or parallel with the second battery string 200 and the third battery string 300, on the one hand, the corner position of the cut end 12 of each battery piece 1 is no longer subjected to the normal pressure of other battery pieces 1, thereby avoiding the occurrence of hidden cracks or even corner drop of the cut end 12 of the battery piece 1, and the light receiving area of each battery string and battery piece 1 is very close, thereby avoiding mismatching of series and parallel connection; in addition, different from the above two embodiments, the third battery string 300 of the embodiment is no longer provided with an inter-string distance with the first battery string 100, but the first battery string 100 is arranged on the third battery string 300, and the laying density of the battery pieces 1 of the photovoltaic module is greater than that of the previous embodiments, which is more helpful to improve the power generation efficiency.

[0088] In addition, the fourth battery string 400, the fifth battery string 500 and the sixth battery string 600 can also be arranged in the second direction according to requirements.

[0089] In addition, the utility model discloses an embodiment of photovoltaic system, it includes above-mentioned back contact battery module. The photovoltaic system of this embodiment avoids the corner position of the cutting end 12 of the cell piece 1 from being pressed by other cell pieces 1, avoids the cutting end 12 of the cell piece 1 from being stacked and pressed, further avoids the cutting end 12 of the cell piece 1 from being cracked or even being cornered. In addition, the interlaced structure between the cell pieces and between the strings avoids series mismatch or parallel mismatch and the power loss caused by the mismatch, and helps to improve the power density of the photovoltaic module as a whole.

[0090] The photovoltaic system of the embodiment can be applied in all fields requiring solar power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a current combiner and an inverter. The photovoltaic array can be an array combination of a plurality of back contact battery modules. For example, a plurality of back contact battery modules can form a plurality of photovoltaic arrays. The photovoltaic arrays are connected to the current combiner. The current combiner can combine the current generated by the photovoltaic arrays. The combined current flows through the inverter to be converted into alternating current required by the power grid, and then is connected to the power grid to realize solar power supply.

[0091] The above description is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above, it is not intended to limit the utility model. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the utility model technical scheme. Any simple modification, equivalent change and modification of the above-mentioned embodiment according to the technical essence of the utility model still belongs to the scope of the utility model.

Claims

1. A battery assembly, comprising: The battery piece includes a plurality of battery pieces, along a first direction, the battery piece has a chamfered end and a cut end, at least one side of the chamfered end has a chamfer, along a third direction, the battery piece has a light receiving surface and a back light surface; A plurality of the battery pieces are arranged and partially overlapped along the first direction to form a first battery string, the cut end of the battery piece on the first battery string is arranged on the chamfered end of the adjacent light receiving surface of the battery piece; A plurality of the battery pieces are arranged and partially overlapped along the first direction to form a second battery string, the chamfered end of the battery piece on the second battery string is arranged on the cut end of the adjacent light receiving surface of the battery piece; The chamfered end of the first battery string and the second battery string faces opposite directions; The first battery string and the second battery string are partially overlapped along a second direction, and the first battery string is arranged on the light receiving surface of the second battery string; The first direction, the second direction and the third direction are arranged in a cross manner; The first battery string includes a first battery piece and a second battery piece, and the cut end of the first battery piece is arranged on the chamfered end of the second battery piece; The second battery string includes a third battery piece and a fourth battery piece, and the chamfered end of the third battery piece is arranged on the cut end of the fourth battery piece; The battery piece further includes a side edge, the side edge is connected to the chamfered end and the cut end at both ends respectively, the side edge of the second battery piece is arranged on the fourth battery piece, and the side edge of the first battery piece is arranged on the third battery piece.

2. The battery assembly of claim 1, wherein, The first battery string and the second battery string are connected in series or parallel.

3. The battery assembly of claim 1, wherein, The battery piece is a half piece cut from a whole piece.

4. The battery assembly of claim 1, wherein, The cut end of the battery piece is provided with a cut edge, the chamfer of the second battery piece is pressed on the side edge of the fourth battery piece, and the chamfer of the third battery piece is pressed on the cut edge of the fourth battery piece.

5. The battery assembly of claim 1, wherein, The cut end of the battery piece is provided with a cut edge, the cut edge of the first battery piece is pressed on the chamfer of the second battery piece, and the side edge of the first battery piece is pressed on the chamfer of the third battery piece.

6. The battery assembly of claim 1, wherein, The length of the chamfer is 1.0-3.5 mm.

7. The battery assembly of claim 1, wherein, The chamfered end of the battery piece has a chamfer edge, and the included angle between the chamfer and the chamfer edge is 100°-160°.

8. The battery assembly of claim 1, wherein, Along the first direction, the width of the partial overlap between the battery pieces is 0.5-3.0 mm.

9. The battery assembly of claim 1, wherein, Along the second direction, the width of the partial overlap between the first battery string and the second battery string is 0.5-2 mm.

10. The battery assembly of claim 1, wherein, The ratio of the width of the partial overlap between the first battery string and the second battery string to the width of the partial overlap between the battery pieces in the first direction is 0.7:1.

5.

11. The battery assembly of claim 4, wherein, The battery piece is provided with a fine grid line extending along the second direction, and the distance between the fine grid line closest to the cut edge and the cut edge is 0.2-1.5 mm.

12. The battery assembly of claim 4, wherein, The chamfered end of the battery piece has a chamfer edge, and the battery piece is provided with a fine grid line extending along the second direction, and the distance between the fine grid line closest to the chamfer edge and the chamfer edge is 0.2-1.5 mm.

13. The battery assembly of claim 1, wherein, The plurality of battery pieces are arranged along the first direction and partially overlap to form a third battery string, and the cut ends of the battery pieces on the third battery string are arranged on the chamfered ends of adjacent battery pieces; Along the second direction, the third battery string is arranged adjacent to the first battery string, and the third battery string and the first battery string have a string distance therebetween; or The third battery string is arranged adjacent to the second battery string, and the third battery string and the second battery string have a string distance therebetween.

14. The battery assembly of claim 13, wherein, The plurality of battery pieces are arranged along the first direction and partially overlap to form a fourth battery string, and the chamfered ends of the battery pieces on the fourth battery string are arranged on the cut ends of adjacent battery pieces; The chamfered ends of the third battery string and the fourth battery string are opposite in direction; The third battery string and the fourth battery string partially overlap along the second direction, and the fourth battery string is arranged on the third battery string.

15. The battery assembly of claim 1, wherein, The plurality of battery pieces are arranged along the first direction and partially overlap to form a third battery string, and the chamfered ends of the battery pieces on the third battery string are arranged on the cut ends of adjacent battery pieces; Along the second direction, the third battery string is arranged adjacent to the first battery string, and the third battery string and the first battery string have a string distance therebetween; or The third battery string is arranged adjacent to the second battery string, and the third battery string and the second battery string have a string distance therebetween.

16. The battery assembly of claim 15, wherein, The plurality of battery pieces are arranged along the first direction and partially overlap to form a fourth battery string, and the cut ends of the battery pieces on the fourth battery string are arranged on the chamfered ends of adjacent battery pieces; The chamfered ends of the third battery string and the fourth battery string are opposite in direction; The third battery string and the fourth battery string partially overlap along the second direction, and the fourth battery string is arranged on the third battery string.

17. The battery assembly of claim 1, wherein, The plurality of battery pieces are arranged along the first direction and partially overlap to form a third battery string, and the chamfered ends of the battery pieces on the third battery string are arranged on the cut ends of adjacent battery pieces; Along the second direction, the second battery string and the third battery string are arranged on opposite sides of the first battery string, the first battery string and the third battery string partially overlap, and the first battery string is arranged on the third battery string.

18. The battery assembly of claim 1, wherein, The first battery string and the second battery string further include bus bars for connecting two battery strings in series or parallel, the bus bars are arranged on the back surfaces of the battery pieces corresponding to the first battery string and the second battery string, and an insulating strip is arranged between each bus bar and the back surface of the battery piece.

19. The battery assembly of claim 18, wherein, The bus bars include a plurality of intermediate bus bars arranged along the second direction, and the battery strings arranged along the first direction form parallel battery string groups through the intermediate bus bars, the chamfered ends of the battery strings on the same parallel battery string group are opposite in direction, and the cut ends of the battery pieces on the same parallel battery string group are arranged on the chamfered ends of adjacent battery pieces; or the chamfered ends of the battery pieces on the same parallel battery string group are arranged on the cut ends of adjacent battery pieces.

20. A photovoltaic system characterized by, A battery assembly comprising any one of the battery assemblies according to claims 1 to 19.