Battery assembly, battery string, photovoltaic assembly and photovoltaic power generation system

Abstract

The utility model discloses a battery assembly, a battery string, a photovoltaic assembly and a photovoltaic power generation system. The battery assembly comprises a battery piece, a plurality of welding strips and at least one bus bar. The battery piece is provided with a plurality of auxiliary grid lines and a plurality of welding spots, the plurality of welding spots comprise a plurality of edge welding spots, and the edge welding spots are located on the auxiliary grid lines at the edge of at least one side of the adjacent battery piece along the second direction; the plurality of welding strips are electrically connected with the plurality of edge welding spots respectively; the bus bar is arranged on the edge of the side where the edge welding spots of the battery piece are located in the first direction, the bus bar is electrically connected with the multiple edge welding spots, and at least parts of the bus bar and the welding strip are in lap joint with the edge welding spots respectively. And at least parts of the bus bar and the welding strip are respectively overlapped on the edge welding spots, so that the bus bar and the welding strip are prevented from being overlapped along the third direction, the number of layers of the battery assembly is reduced, the height of the battery assembly is reduced, the light and thin design of the battery assembly is facilitated, the cracking risk during lamination of the battery assembly is reduced, and the reliability and the safety of the battery assembly are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar photovoltaic module technical field especially is related to a battery module, battery string, photovoltaic module and photovoltaic power generation system. BACKGROUND

[0002] In prior art, the edge main grid of the cell piece adopts thickening design, the current is collected to the solder strip through the main grid, the resistance is big, the edge main grid is blackened, the high-density cell module has the higher risk of splitting when laminating, the solder strip is easy to be pressed through the insulating glue and leads to the short circuit risk, reduces the reliability and safety of cell module. SUMMARY

[0003] The utility model discloses at least one of the technical problems in prior art is solved, for this, one purpose of the utility model is to propose a battery module, can improve the reliability and safety of battery module.

[0004] The second purpose of the utility model is to propose a battery string, including the battery module of the first aspect embodiment.

[0005] The third purpose of the utility model is to propose a photovoltaic module, including the battery module of the first aspect embodiment or the battery string of the second aspect embodiment.

[0006] The fourth purpose of the utility model is to propose a photovoltaic power generation system, including the battery module of the first aspect embodiment or the battery string of the second aspect embodiment or the photovoltaic module of the third aspect embodiment.

[0007] According to the battery module of the first aspect embodiment of the utility model, the battery module includes: cell piece, a plurality of solder strips and at least one bus bar, a plurality of vice grid lines and a plurality of solder joints are equipped on the cell piece, a plurality of vice grid lines extend along the first direction, a plurality of vice grid lines are spaced apart along the second direction, a plurality of solder joints include a plurality of edge solder joints, a plurality of edge solder joints are spaced apart along the first direction, the edge solder joint is located on the vice grid line adjacent to at least one side edge of the cell piece along the second direction, the first direction and the second direction are perpendicular;A plurality of solder strips extend along the second direction, a plurality of solder strips are spaced apart along the first direction, and a plurality of solder strips are electrically connected with a plurality of edge solder joints respectively;The bus bar is located on the edge of the side of the cell piece where the edge solder joint is at along the first direction, the bus bar is electrically connected with a plurality of edge solder joints, and at least part of the bus bar and the solder strip are respectively overlapped on the edge solder joint.

[0008] According to the battery assembly provided in the embodiment of the present application, the at least partial overlap of the bus bar and the welding strip on the edge welding point is arranged, so that the bus bar and the welding strip are prevented from being stacked along the third direction, i.e. the thickness direction of the battery sheet, the number of layers of the battery assembly is reduced, the height of the battery assembly along the third direction is reduced, the light and thin design of the battery assembly is facilitated, meanwhile, the risk of cracking of the battery assembly during lamination is reduced, the service life of the battery assembly is prolonged, and the reliability and safety of the battery assembly are improved.

[0009] In some embodiments, the portions of the bus bar and the welding strip that overlap on the edge welding points are arranged at intervals from each other.

[0010] In some embodiments, the plurality of sub-grid lines include a plurality of positive grid lines and a plurality of negative grid lines, the plurality of positive grid lines and the plurality of negative grid lines are arranged in a staggered manner along the second direction; the plurality of welding strips include a plurality of first welding strips and a plurality of second welding strips, the plurality of first welding strips and the plurality of second welding strips are arranged in a staggered manner along the first direction, the first welding strips are connected with the positive grid lines, and the second welding strips are connected with the negative grid lines; the plurality of edge welding points include a plurality of first edge welding points and a plurality of second edge welding points, the end portions of the first welding strips overlap with the first edge welding points, and the end portions of the second welding strips overlap with the second edge welding points; the bus bar is electrically connected with the plurality of first welding strips through the first edge welding points, the bus bar is insulatively arranged with the plurality of second edge welding points and the plurality of second welding strips, the distance between the end portion of the second welding strip and the corresponding side edge of the bus bar is greater than the distance between the end portion of the first welding strip and the corresponding side edge of the bus bar; or, the bus bar is electrically connected with the plurality of second welding strips through the second edge welding points, the bus bar is insulatively arranged with the plurality of first edge welding points and the plurality of first welding strips, and the distance between the end portion of the first welding strip and the corresponding side edge of the bus bar is greater than the distance between the end portion of the second welding strip and the corresponding side edge of the bus bar.

[0011] In some embodiments, when the bus bar is electrically connected with the plurality of first welding strips through the first edge welding points and the bus bar is insulatively arranged with the plurality of second edge welding points and the plurality of second welding strips, the distance between the second edge welding point and the corresponding side edge of the battery sheet is greater than the distance between the first edge welding point and the corresponding side edge of the battery sheet; or, when the bus bar is electrically connected with the plurality of second welding strips through the second edge welding points and the bus bar is insulatively arranged with the plurality of first edge welding points and the plurality of first welding strips, the distance between the first edge welding point and the corresponding side edge of the battery sheet is greater than the distance between the second edge welding point and the corresponding side edge of the battery sheet.

[0012] In some embodiments, the battery assembly further comprises: an insulating member, when the bus bar is electrically connected with the plurality of first solder strips through the first edge solder joint, the insulating member is arranged between the bus bar and the plurality of second edge solder joints and the plurality of second solder strips; and when the bus bar is electrically connected with the plurality of second solder strips through the second edge solder joint, the insulating member is arranged between the bus bar and the plurality of first edge solder joints and the plurality of first solder strips.

[0013] In some embodiments, a width of an end of the edge solder joint adjacent to a corresponding side edge of the battery sheet in the first direction is greater than a width of another end of the edge solder joint in the first direction.

[0014] In some embodiments, the edge solder joint comprises a first connecting portion and a second connecting portion connected to each other along the second direction, the bus bar is overlapped on the first connecting portion, and the end of the solder strip is overlapped on the second connecting portion.

[0015] In some embodiments, a width of the second connecting portion along the second direction has a decreasing trend away from the first connecting portion.

[0016] In some embodiments, a width of the first connecting portion along the second direction remains unchanged.

[0017] In some embodiments, the battery assembly further comprises: an edge solder joint connecting line connected between the edge solder joint and the corresponding side edge of the battery sheet along the second direction, the edge solder joint connecting line is electrically connected with the sub-grid line between the edge solder joint and the corresponding side edge of the battery sheet.

[0018] In some embodiments, a height of the edge solder joint connecting line along a thickness direction of the battery sheet is H1, the H1 satisfies: 0 < H1 ≤ 15 μm; and / or, a height of the solder strip along the thickness direction of the battery sheet is H2, the H2 satisfies: 0.1 mm ≤ H2 ≤ 0.5 mm.

[0019] In some embodiments, a width of the edge solder joint connecting line along the first direction is L1, the L1 satisfies: 0 < L1 ≤ 0.3 mm; and / or, a width of the solder strip along the first direction is L2, the L2 satisfies: 0.1 mm ≤ L2 ≤ 3 mm.

[0020] In some embodiments, the battery assembly further comprises: an edge main grid line arranged at an edge of the battery sheet along the first direction, the edge main grid line is electrically connected with the solder joint adjacent to the edge of the battery sheet among the plurality of solder joints along the first direction.

[0021] In some embodiments, the edge main grid line comprises: a first grid line segment and a second grid line segment, the first grid line segment is arranged adjacent to the edge of the battery piece along the second direction; the second grid line segment is connected with the first grid line segment, and the width of the first grid line segment along the first direction is greater than the width of the second grid line segment along the first direction.

[0022] In some embodiments, the width of the first grid line segment is L3, and the L3 satisfies: 50 μm≤L3≤500 μm; the width of the second grid line segment is L4, and the L4 satisfies: 0<L4≤50 μm.

[0023] In some embodiments, at least part of the width of the edge main grid line is equal to the width of the auxiliary grid line.

[0024] In some embodiments, the width of the edge main grid line along the first direction is L5, and the L5 satisfies: 0<L5≤50 μm.

[0025] In some embodiments, the plurality of positive grid lines comprises a first positive grid line, the first positive grid line is arranged adjacent to the solder joint connected with the negative grid line along the first direction, and the first positive grid line has a first bending segment adjacent to one end of the edge of the battery piece along the first direction, the first bending segment extends towards the adjacent solder joint; the plurality of negative grid lines comprises a first negative grid line, the first negative grid line is arranged adjacent to the solder joint connected with the positive grid line along the first direction, and the first negative grid line has a second bending segment adjacent to one end of the edge of the battery piece along the first direction, the second bending segment extends towards the adjacent solder joint.

[0026] In some embodiments, the auxiliary grid line is provided with a thickened segment, and the solder strip is connected with the thickened segment.

[0027] In some embodiments, the width of the solder strip along the first direction is L6, and the L6 satisfies: 0.1 mm≤L6≤3 mm; the height of the solder strip along the thickness direction of the battery piece is H2, and the H2 satisfies: 0.1 mm≤H2≤0.5 mm; or, the diameter of the solder strip is D, and the D satisfies: 0.1 mm≤D≤0.5 mm.

[0028] In some embodiments, the battery assembly further comprises: a plurality of main grid lines, the main grid lines extend along the second direction and are spaced along the first direction, and the main grid lines are arranged between the solder strip and the solder joint.

[0029] The battery string according to the second aspect of the present application comprises the battery assembly according to the first aspect of the present application.

[0030] The photovoltaic module according to the third aspect of the present application comprises the battery assembly according to the first aspect of the present application or the battery string according to the second aspect of the present application.

[0031] The photovoltaic power generation system according to the fourth aspect of the present application comprises the battery assembly according to the first aspect of the present application, the battery string according to the second aspect of the present application or the photovoltaic module according to the third aspect of the present application.

[0032] Additional aspects and advantages of the present application will be described in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a schematic view of a battery assembly according to an embodiment of the present application;

[0035] Figure 2 is Figure 1 is an enlarged schematic view of a P region in the above figure;

[0036] Figure 3 is Figure 1 is an enlarged schematic view of a Q region in the above figure;

[0037] Figure 4 is Figure 1 is an enlarged schematic view of an N region in the above figure;

[0038] Figure 5 is a cross-sectional schematic view of a busbar according to an embodiment of the present application.

[0039] REFERENCE NUMERALS:

[0040] 100, battery assembly;

[0041] 10, battery piece; 11, sub-grid line; 111, positive grid line; 112, negative grid line; 12, welding point; 13, edge welding point; 131, first edge welding point; 132, second edge welding point; 14, first connecting part; 15, second connecting part; 16, first positive grid line; 161, first bending section; 17, first negative grid line; 171, second bending section; 18, thickened section;

[0042] 20, solder strip; 21, first solder strip; 22, second solder strip; 23, edge solder strip;

[0043] 30, busbar; 31, first busbar; 32, second busbar;

[0044] 40, insulating member;

[0045] 50, edge solder joint connecting line; 51, first edge solder joint connecting line; 52, second edge solder joint connecting line;

[0046] 60, edge main grid line; 61, positive edge main grid line; 62, negative edge main grid line; 63, first grid line segment; 64, second grid line segment;

[0047] 70, main grid line;

[0048] A, first direction; B, second direction; C, third direction. DETAILED DESCRIPTION

[0049] The embodiments of the utility model are described in detail below, the embodiments described with reference to the drawings are exemplary, and the following refers to Figures 1-5 The battery assembly 100 according to the embodiments of the utility model is described below, the battery assembly 100 comprises: a battery piece 10, a plurality of solder strips 20 and at least one bus bar 30.

[0050] As shown in Figure 1 and Figure 2 The battery piece 10 is provided with a plurality of sub-grid lines 11 and a plurality of solder joints 12, the plurality of sub-grid lines 11 extends along the first direction A, the plurality of sub-grid lines 11 is arranged at intervals along the second direction B, the plurality of solder joints 12 comprises a plurality of edge solder joints 13, the plurality of edge solder joints 13 is arranged at intervals along the first direction A, the edge solder joint 13 is located on the sub-grid line 11 adjacent to at least one side edge of the battery piece 10 along the second direction B, the first direction A and the second direction B are perpendicular; the plurality of solder strips 20 extends along the second direction B, the plurality of solder strips 20 is arranged at intervals along the first direction A, the plurality of solder strips 20 is respectively electrically connected with the plurality of edge solder joints 13; the bus bar 30 is arranged at the edge of the side of the battery piece 10 where the edge solder joint 13 is located along the first direction A, the bus bar 30 is electrically connected with the plurality of edge solder joints 13, and at least part of the bus bar 30 and the solder strip 20 are respectively overlapped on the edge solder joint 13. Wherein, the first direction A can be the width direction of the battery piece 10, and the second direction B is the length direction of the battery piece 10.

[0051] The plurality of solder points 12 are arranged on the bus bars 11 away from the battery sheet 10 along a third direction C, the third direction C being a thickness direction of the battery sheet 10, and the plurality of edge solder points 13 are respectively arranged on the bus bars 11 adjacent to the two side edges of the battery sheet 10 along a second direction B; the two ends of the plurality of solder strips 20 along the second direction B are arranged on the plurality of edge solder points 13 away from the battery sheet 10 along the third direction C to form electrical connection with the plurality of edge solder points 13; and the bus bars 30 extend along the first direction A and are arranged at at least one side edge of the battery sheet 10 along the second direction B, and the bus bars 30 are arranged on the plurality of edge solder points 13 away from the battery sheet 10 along the third direction C adjacent to the plurality of edge solder points 13 along the second direction B to form electrical connection with the plurality of edge solder points 13.

[0052] That is, the bus bars 30 and the solder strips 20 are arranged on the bus bars 11 away from the battery sheet 10, and the bus bars 30 are arranged adjacent to the edges of the battery sheet 10 along the second direction B and cover at least part of the bus bars 11, and the bus bars 30 are not in contact with the bus bars 11 or are insulated from the bus bars 11, and the edge solder points 13 are arranged between the ends of the solder strips 20 along the second direction B and the bus bars 30 corresponding to the ends, the edge solder points 13 are arranged between the bus bars 30 and the solder strips 20 and the battery sheet 10, and the edge solder points 13 are connected to at least one bus bar 11. The parts of the bus bars 30 and the solder strips 20 and the edge solder points 13 in contact are located in the same plane.

[0053] According to the battery assembly 100 of the embodiment of the present application, the at least part of the bus bars 30 and the solder strips 20 are arranged to overlap the edge solder points 13 respectively, so that the bus bars 30 and the solder strips 20 are not stacked along the third direction C, i.e. the thickness direction of the battery sheet 10, the number of layers of the battery assembly 100 is reduced, and the height of the battery assembly 100 along the third direction C is reduced, which is beneficial to the thin and light design of the battery assembly 100, and at the same time, the risk of cracking of the battery assembly 100 during lamination is reduced, the service life of the battery assembly 100 is prolonged, and the reliability and safety of the battery assembly 100 are improved.

[0054] According to some embodiments of the present application, as shown in Figure 1 and Figure 4 The parts of the bus bars 30 and the solder strips 20 overlapping the edge solder points 13 are arranged apart from each other.

[0055] In the embodiment, one end of the bus bars 30 and the solder strips 20 adjacent to each other is arranged on the edge solder points 13 along the second direction B, which can avoid the risk of short circuit caused by the contact between the bus bars 30 and the solder strips 20, and at the same time, the design process requirement of the solder strips 20 is reduced, the arrangement and arrangement of the solder strips 20 on the battery sheet 10 are facilitated, and the assembly efficiency of the battery assembly 100 is improved.

[0056] Therefore, by arranging the overlapping parts of the bus bar 30 and the welding strip 20 on the edge welding point 13 to be spaced from each other, the risk of short circuit caused by the contact between the bus bar 30 and the welding strip 20 can be effectively reduced, the assembly process requirement of the battery assembly 100 is reduced, the service life of the battery assembly 100 is prolonged, and the reliability and safety of the battery assembly 100 are improved.

[0057] Optionally, the ends of the bus bar 30 and the welding strip 20 adjacent to each other along the second direction B can be abutted and insulated from each other, for example, when the bus bar 30 and the welding strip 20 collect the same polarity current, the welding strip 20 and the bus bar 30 can be abutted, and when the bus bar 30 and the welding strip 20 collect different polarity currents, the bus bar 30 and the welding strip 20 collecting different polarity currents need to be insulated, so that the insulating glue can be arranged between the bus bar 30 and the adjacent welding strip 20 collecting different polarity currents to avoid the contact between the bus bar 30 and the welding strip 20 collecting different polarity currents, and the contact area of the bus bar 30 and the welding strip 20 with the edge welding point 13 can be increased, and the reliability of the working connection of the battery assembly 100 is improved.

[0058] According to some embodiments of the present application, as shown in Figure 2 The plurality of bus bars 30 include a plurality of first bus bars 31 and a plurality of second bus bars 32, the plurality of first bus bars 31 and the plurality of second bus bars 32 are arranged along the first direction A, the first bus bar 31 is connected with the first edge welding point 131, and the second bus bar 32 is connected with the second edge welding point 132; the plurality of edge welding points 13 include a plurality of first edge welding points 131 and a plurality of second edge welding points 132, the end of the first welding strip 21 is overlapped with the first edge welding point 131, and the end of the second welding strip 22 is overlapped with the second edge welding point 132; the bus bar 30 is electrically connected with the plurality of first welding strips 21 through the first edge welding point 131, the bus bar 30 is insulated from the plurality of second edge welding points 132 and the plurality of second welding strips 22, and the distance between the end of the second welding strip 22 and the corresponding side edge of the bus bar 30 is greater than the distance between the end of the first welding strip 21 and the corresponding side edge of the bus bar 30.

[0059] The first solder strip 21 is electrically connected with the positive grid line 111, and the positive current on the positive grid line 111 can be transmitted to the first edge solder joint 131 through the first solder strip 21; the second solder strip 22 is electrically connected with the negative grid line 112, and the negative current on the negative grid line 112 can be transmitted to the second edge solder joint 132 through the second solder strip 22. The bus bar 30 includes a first bus bar 31 and a second bus bar 32, and the first bus bar 31 and the second bus bar 32 are respectively arranged at two ends of the battery piece 10 along the second direction B. In the embodiment, the first bus bar 31 is away from the side of the edge of the battery piece 10 and is overlapped with the plurality of first edge solder joints 131.

[0060] The first bus bar 31 is overlapped with the first solder strip 21 at the corresponding first edge solder joint 131, the current collected by the first solder strip 21 is output to the first bus bar 31 through the first edge solder joint 131, the first bus bar 31 is overlapped with the second solder strip 22 at the corresponding second edge solder joint 132, at this time, the first bus bar 31 and the second edge solder joint 132 are insulated, the first bus bar 31 and the second solder strip 22 are spaced apart, and the distance between the second solder strip 22 and the first bus bar 31 is controlled to be greater than the distance between the first solder strip 21 and the first bus bar 31, so as to further reduce the possibility of short circuit between the second solder strip 22 of different polarity and the first bus bar 31, optimize the structural layout of the battery assembly 100, and improve the assembly efficiency and service life of the battery assembly 100.

[0061] Therefore, when the first bus bar 31 is overlapped with the plurality of first edge solder joints 131 and is insulated from the plurality of second edge solder joints 132 and the plurality of second solder strips 22, the distance between the second solder strip 22 and the end of the first bus bar 31 adjacent to each other along the second direction B is greater than the distance between the first solder strip 21 and the end of the first bus bar 31 adjacent to each other along the second direction B, which can ensure the insulation effect between the second solder strip 22 and the first bus bar 31, avoid the contact between the second solder strip 22 and the first bus bar 31, and reduce the risk of short circuit. At the same time, the connection between the first bus bar 31 and the first solder strip 21 is facilitated, the contact area of the connection is increased, the structural strength of the connection is improved, and the current is facilitated to be collected from the first solder strip 21 to the first bus bar 31.

[0062] Optionally, the busbar 30 is electrically connected with the plurality of second edge soldering points 132 through the second edge soldering points 132, and the busbar 30 is insulated from the plurality of first edge soldering points 131 and the plurality of first solder strips 21, and the distance between the end of the first solder strip 21 and the corresponding side edge of the busbar 30 is greater than the distance between the end of the second solder strip 22 and the corresponding side edge of the busbar 30. In the embodiment, the busbar 30 is a second busbar 32, and the second busbar 32 is overlapped with the plurality of second edge soldering points 132 on the side away from the edge of the battery piece 10. The second busbar 32 is overlapped with the second solder strip 22 at the corresponding second edge soldering point 132, the current collected by the second solder strip 22 is output to the second busbar 32 through the second edge soldering point 132, and the second busbar 32 is overlapped with the first solder strip 21 at the corresponding first edge soldering point 131. At this time, the second busbar 32 is insulated from the first edge soldering point 131, and the second busbar 32 is spaced apart from the first solder strip 21, and the distance between the first solder strip 21 and the second busbar 32 is controlled to be greater than the distance between the second solder strip 22 and the second busbar 32.

[0063] Therefore, the distance between the end of the first solder strip 21 and the corresponding side edge of the second busbar 32 is greater than the distance between the end of the second solder strip 22 and the corresponding side edge of the second busbar 32, which can effectively avoid the contact between the second busbar 32 and the first solder strip 21, improve the insulation effect between the second busbar 32 and the first solder strip 21, reduce the risk of short circuit, and improve the safety and reliability of the battery assembly 100.

[0064] According to some embodiments of the utility model, as shown in Figure 2 When the busbar 30 is electrically connected with the plurality of first solder strips 21 through the first edge soldering points 131, and the busbar 30 is insulated from the plurality of second edge soldering points 132 and the plurality of second solder strips 22, the distance between the second edge soldering point 132 and the corresponding side edge of the battery piece 10 is greater than the distance between the first edge soldering point 131 and the corresponding side edge of the battery piece 10. In the embodiment, the busbar 30 is a first busbar 31. That is, for the first edge soldering point 131 and the second edge soldering point 132 adjacent to the first busbar 31, the first edge soldering point 131 is electrically connected with the first busbar 31, and the second edge soldering point 132 is insulated from the first busbar 31. On the side of the edge of the battery piece 10 where the first busbar 31 is located, the distance between the second edge soldering point 132 and the corresponding edge of the battery piece 10 is greater than the distance between the first edge soldering point 131 and the corresponding edge of the battery piece 10.

[0065] Thus, when the first bus bar 31 overlaps the first edge solder point 131 along the second direction B adjacent to one side of the first edge solder point 131, the distance between the second edge solder point 132 and the corresponding side edge of the battery piece 10 is greater than the distance between the first edge solder point 131 and the corresponding side edge of the battery piece 10, which can further ensure that the part of the second solder strip 22 overlapping the second edge solder point 132 does not contact the first bus bar 31, further improve the insulation effect between the first bus bar 31 and the second solder strip 22, and ensure the connection between the first insulation solder point 12 and the first bus bar 31.

[0066] Alternatively, when the bus bar 30 is electrically connected to the plurality of second solder strips 22 through the second edge solder point 132, and the plurality of first edge solder points 131 and the plurality of first solder strips 21 are both insulated from the bus bar 30, the distance between the first edge solder point 131 and the corresponding side edge of the battery piece 10 is greater than the distance between the second edge solder point 132 and the corresponding side edge of the battery piece 10. In this embodiment, the bus bar 30 is a second bus bar 32. That is, for the first edge solder point 131 and the second edge solder point 132 adjacent to the second bus bar 32, the second edge solder point 132 is electrically connected to the second bus bar 32, and the first edge solder point 131 is insulated from the second bus bar 32. On one side of the edge of the battery piece 10 where the second bus bar 32 is located, the distance between the first edge solder point 131 and the corresponding edge of the battery piece 10 is greater than the distance between the second edge solder point 132 and the corresponding edge of the battery piece 10.

[0067] Thus, the arrangement that the distance between the first edge solder point 131 and the corresponding side edge of the battery piece 10 is greater than the distance between the second edge solder point 132 and the corresponding side edge of the battery piece 10 can further avoid the contact between the bus bar 30 and the first solder strip 21, improve the insulation effect between the bus bar 30 and the first solder strip 21, improve the safety of the battery assembly 100, increase the contact area between the bus bar 30 and the second edge solder point 132, and improve the working efficiency of the battery assembly 100.

[0068] According to some embodiments of the present application, as shown in Figure 5 According to some embodiments of the present application, as shown in

[0069] Optionally, when the busbar 30 is electrically connected to the plurality of second solder strips 22 via the second edge solder joints 132, an insulating member 40 is disposed between the busbar 30 and the plurality of first edge solder joints 131 and the plurality of first solder strips 21. That is, for the second busbar 32, when the second busbar 32 is electrically connected to the second edge solder joints 132, an insulating member 40 is disposed between the second busbar 32 and the first edge solder joints 131, and an insulating member 40 is disposed between the second busbar 32 and the first solder strips 21 or the second busbar 32 and the first solder strips 21 are kept spaced apart. In this embodiment, the insulating member 40 may be insulating adhesive.

[0070] Therefore, by providing the insulating component 40, when the busbar 30 is electrically connected to the multiple first solder strips 21 through the first edge solder joint 131, it can effectively prevent the busbar 30 from contacting the multiple second edge solder joints 132 and the multiple second solder strips 22. When the busbar 30 is electrically connected to the multiple second solder strips 22 through the second edge solder joint 132, it can effectively prevent the busbar 30 from contacting the multiple first edge solder joints 131 and the multiple first solder strips 21, thereby reducing the short-circuit risk of the battery assembly 100 and improving the safety and reliability of the battery assembly 100.

[0071] According to some embodiments of this utility model, such as Figure 2 As shown, the width of one end of the edge solder joint 13 adjacent to the corresponding side edge of the battery cell 10 in the first direction A is greater than the width of the other end of the edge solder joint 13 in the first direction A.

[0072] That is, the width of the edge solder joint 13 along the second direction B near the busbar 30 along the first direction A is greater than the width of the edge solder joint 13 along the second direction B near the solder strip 20 along the first direction A. This increases the contact area between the busbar 30 and the edge solder joint 13, improving the working efficiency of the battery module 100, while reducing the cost of the edge solder joint 13, reducing paste usage, increasing the length of the sub-busbar line 11 near the other end of the edge solder joint 13 along the first direction A, facilitating increased current collection from the battery cell 10, and reducing the resistance at the connection between the solder strip 20 and the edge solder joint 13, so that the current collected on the solder strip 20 can be quickly collected to the busbar 30 via the edge solder joint 13.

[0073] According to some embodiments of this utility model, such as Figure 2 As shown, the edge solder joint 13 includes a first connecting portion 14 and a second connecting portion 15 that are connected to each other along the second direction B. The busbar 30 overlaps on the first connecting portion 14, and the end of the solder strip 20 overlaps on the second connecting portion 15.

[0074] The edge solder joint 13 is provided with a first connecting part 14 adjacent to one end of the bus bar 30 along the second direction B, and a second connecting part 15 adjacent to the other end of the solder strip 20 along the second direction B, wherein the bus bar 30 is overlapped on one side surface of the battery piece 10 away from the first connecting part 14 along the third direction C, and the solder strip 20 is overlapped on one side surface of the battery piece 10 away from the second connecting part 15 along the third direction C.

[0075] Therefore, by the provision of the first connecting part 14 and the second connecting part 15 of the edge solder joint 13, the one end of the bus bar 30 and the solder strip 20 adjacent to each other can be overlapped on the edge solder joint 13 together, the bus bar 30 and the solder strip 20 are prevented from being stacked along the third direction C, and the lamination height of the battery assembly 100 is reduced.

[0076] According to some embodiments of the present application, as shown in Figure 2 The width of the second connecting part 15 along the second direction B presents a decreasing trend in the direction away from the first connecting part 14.

[0077] The width of the second connecting part 15 along the first direction A gradually decreases along the second direction B in the direction from one end adjacent to the first connecting part 14 to the other end away from the first connecting part 14, and in the present embodiment, the projection of the second connecting part 15 on the battery piece 10 along the third direction C presents a triangular shape.

[0078] Therefore, by the provision of the second connecting part 15, the shielding area of the second connecting part 15 to the battery piece 10 can be reduced, the length of the sub-grid line 11 at the two ends of the second connecting part 15 along the first direction A can be increased, the current on the battery piece 10 can be fully collected by the sub-grid line 11, meanwhile, the production cost of the second connecting part 15 is reduced, the use of paste is reduced, the resistance is reduced, and the power generation efficiency of the battery assembly 100 is improved.

[0079] According to some embodiments of the present application, as shown in Figure 2 The width of the first connecting part 14 along the second direction B remains unchanged.

[0080] That is, the width of the first connecting part 14 along the first direction A remains unchanged along the second direction B in the direction from one end adjacent to the second connecting part 15 to the other end away from the second connecting part 15, and in the present embodiment, the projection of the first connecting part 14 on the battery piece 10 along the third direction C presents a rectangular shape.

[0081] Therefore, by the provision of the first connecting part 14, the contact area of the bus bar 30 and the first connecting part 14 can be increased, the machining precision of the first connecting part 14 is reduced, the current on the solder strip 20 can be transmitted to the bus bar 30 through the edge solder joint 13, the current transmission efficiency is improved, the reliability and stability of the overlap of the bus bar 30 and the first connecting part 14 are improved, and the stability and reliability of the battery assembly 100 are improved.

[0082] According to some embodiments of the present application, as shown in Figure 2 The battery assembly 100 further comprises: an edge solder joint connecting wire 50, the edge solder joint connecting wire 50 is connected between the edge solder joint 13 and the corresponding side edge of the battery sheet 10 along the second direction B, and the edge solder joint connecting wire 50 is electrically connected with the sub-grid line 11 between the edge solder joint 13 and the corresponding side edge of the battery sheet 10.

[0083] In the present embodiment, the edge solder joint connecting wire 50 comprises a first edge solder joint connecting wire 51 and a second edge solder joint connecting wire 52, one end of the first edge solder joint connecting wire 51 adjacent to the first edge solder joint 131 is connected with the first edge solder joint 131, and the other end of the first edge solder joint connecting wire 51 extends in the direction away from the first edge solder joint 131 along the second direction B and is connected with a plurality of positive grid lines 111 adjacent to the edge of the battery sheet 10; one end of the second edge solder joint connecting wire 52 adjacent to the second edge solder joint 132 is connected with the second edge solder joint 132, and the other end of the second edge solder joint connecting wire 52 extends in the direction away from the second edge solder joint 132 along the second direction B and is connected with a plurality of negative grid lines 112 adjacent to the edge of the battery sheet 10.

[0084] When the bus bar 30 is insulated from the edge solder joint connecting wire 50 and the plurality of sub-grid lines 11 adjacent to the edge of the battery sheet 10, the positive current of the positive grid line 111 adjacent to the edge of the battery sheet 10 is collected to the first edge solder joint 131 through the first edge solder joint connecting wire 51, the positive current on the first solder strip 21 is collected to the first edge solder joint 131, and then is collected to the first bus bar 31 together and is led out.

[0085] Therefore, by the setting of the edge solder joint connecting wire 50, the current on the corresponding sub-grid line 11 can be transmitted to the edge solder joint 13 through the edge solder joint connecting wire 50 and then collected to the bus bar 30, which facilitates the collection of the current on the sub-grid line 11 covered by the bus bar 30, improves the current collection efficiency, and reduces the cost of the solder strip 20 and the height between the bus bar 30 and the battery sheet 10 along the third direction C.

[0086] Optionally, when the first bus bar 31 is insulated from the plurality of sub-grid lines 11 adjacent to the edge of the battery sheet 10 and is electrically connected with the first edge solder joint connecting line 51, and the first bus bar 31 is insulated from the second edge solder joint connecting line 52, at this time, the current on the plurality of corresponding sub-grid lines 11 adjacent to the edge of the battery sheet 10, such as the positive grid line 111, is directly collected to the first bus bar 31 through the first edge solder joint connecting line 51; similarly, when the second bus bar 32 is insulated from the plurality of sub-grid lines 11 adjacent to the edge of the battery sheet 10 and is electrically connected with the second edge solder joint connecting line 52, and the second bus bar 32 is insulated from the first edge solder joint connecting line 51, at this time, the current on the plurality of corresponding sub-grid lines 11 adjacent to the edge of the battery sheet 10, such as the negative grid line 112, is directly collected to the second bus bar 32 through the second edge solder joint connecting line 52.

[0087] According to some embodiments of the present application, the height of the edge solder joint connecting line 50 along the thickness direction of the battery sheet 10, that is, the third direction C, is H1, and H1 satisfies: 0 < H1 ≤ 15 μm.

[0088] When the height of the edge solder joint connecting line 50 along the third direction C is greater than 15 μm, the height of the edge solder joint connecting line 50 along the third direction C is too large, which may cause the lap joint of the bus bar 30 and the edge solder joint 13 to be uneven, and the lamination height of the battery assembly 100 is too high, which is prone to cause the risk of splitting. For example, H1 = 10 μm.

[0089] Optionally, when the cross-sectional shape of the solder strip 20 is circular, the height of the solder strip 20 along the thickness direction of the battery sheet 10, that is, the third direction C, is H2, and H2 satisfies: 0.1 mm ≤ H2 ≤ 0.5 mm.

[0090] When the height of the solder strip 20 along the third direction C is less than 0.1 mm, the height of the solder strip 20 along the third direction C is small, which may cause the structural strength of the solder strip 20 to be low, and the current transmission efficiency of the solder strip 20 to be low; when the height of the solder strip 20 along the third direction C is greater than 0.5 mm, the height of the solder strip 20 along the third direction C is large, and the current loss of the solder strip 20 is high. For example, H2 = 0.3 mm.

[0091] Optionally, the height of the edge solder joint connecting line 50 along the thickness direction of the battery sheet 10, that is, the third direction C, is H1, and H1 satisfies: 0 < H1 ≤ 15 μm; at the same time, the height of the solder strip 20 along the thickness direction of the battery sheet 10, that is, the third direction C, is H2, and H2 satisfies: 0.1 mm ≤ H2 ≤ 0.5 mm.

[0092] Therefore, limiting the height range of the edge solder joint connection line 50 along the third direction C and limiting the height range of the solder strip 20 along the third direction C can avoid unevenness at the overlap of the busbar 30 and the edge solder joint 13, which facilitates the lamination of the battery module 100, reduces the lamination height, improves the current transmission efficiency of the battery module 100, reduces the current loss of the battery module 100, extends the service life of the battery module 100, and improves the output power and reliability of the battery module 100.

[0093] According to some embodiments of the present invention, the width of the edge solder joint connection line 50 along the first direction A is L1, and L1 satisfies: 0 < L1 ≤ 0.3 mm.

[0094] When the width of the edge solder joint connection line 50 along the first direction A is greater than 0.3mm, the width of the edge solder joint connection line 50 along the first direction A is too large, which may result in a large blocking area of ​​the edge solder joint connection line 50 on the battery cell 10, which is not conducive to current collection, and the cost of the edge solder joint connection line 50 is high. For example, L1=0.2mm.

[0095] Optionally, when the cross-sectional shape of the welding strip 20 is elliptical or polygonal, the width of the welding strip 20 along the first direction A is L2, and L2 satisfies: 0.1mm≤L2≤3mm.

[0096] When the width of the solder strip 20 along the first direction A is less than 0.1 mm, the width of the solder strip 20 along the first direction A is small, which may result in higher resistance and lower current transmission efficiency. When the width of the solder strip 20 along the first direction A is greater than 3 mm, the width of the solder strip 20 along the first direction A is large, which may result in a larger area of ​​the solder strip 20 blocking the solar cell 10, which is not conducive to current collection on the solar cell 10, and the production cost of the solder strip 20 is also higher. For example, L2 = 2 mm.

[0097] Optionally, the width of the edge solder joint connection line 50 along the first direction A is L1, where L1 satisfies: 0 < L1 ≤ 0.3 mm; at the same time, the width of the solder strip 20 along the first direction A is L2, where L2 satisfies: 0.1 mm ≤ L2 ≤ 3 mm.

[0098] Therefore, by limiting the width range of the edge solder joint connection line 50 along the first direction A and the width range of the solder strip 20 along the first direction A, the resistance can be reduced, the current transmission efficiency of the edge solder joint connection line 50 and the solder strip 20 can be improved, the output power of the battery module 100 can be increased, and the production cost of the battery module 100 can be reduced.

[0099] According to some embodiments of this utility model, such as Figure 4As shown, the battery assembly 100 further comprises: an edge main busbar 60, the edge main busbar 60 is arranged at the edge of the battery sheet 10 along the first direction A, and the edge main busbar 60 is electrically connected with the welding spots 12 adjacent to the edge of the battery sheet 10 along the first direction A among the plurality of welding spots 12.

[0100] The edge main busbar 60 extends along the second direction B and is arranged at the edges of the battery sheet 10 along the first direction A, the edge main busbar 60 is electrically connected with the plurality of welding spots 12 adjacent to the edge of the battery sheet 10 along the first direction A, and the edge main busbar 60 is connected with the sub-busbars 11 adjacent to the edges of the battery sheet 10 along the first direction A among the plurality of sub-busbars 11.

[0101] In the embodiment, the edge main busbar 60 comprises a positive electrode edge main busbar 61 and a negative electrode edge main busbar 62, the positive electrode edge main busbar 61 is connected with the positive electrode busbar 111 adjacent to one edge of the battery sheet 10 along the first direction A, and the negative electrode edge main busbar 62 is connected with the negative electrode busbar 112 adjacent to the other edge of the battery sheet 10 along the first direction A.

[0102] Therefore, by arranging the edge main busbar 60, the current on the sub-busbars 11 adjacent to the edges of the battery sheet 10 along the first direction A among the plurality of sub-busbars 11 can be conveniently collected, and the current can be transmitted to the plurality of welding spots 12 adjacent to the edge of the battery sheet 10 along the first direction A, thereby improving the output power of the battery assembly 100.

[0103] According to some embodiments of the present application, as shown in Figure 4 The edge main busbar 60 comprises: a first busbar segment 63 and a second busbar segment 64, the first busbar segment 63 is arranged adjacent to the edge of the battery sheet 10 along the second direction B; the second busbar segment 64 is connected with the first busbar segment 63, and the width of the first busbar segment 63 along the first direction A is greater than the width of the second busbar segment 64 along the first direction A.

[0104] The first busbar segment 63 is arranged at the edges of the battery sheet 10 along the second direction B, the second busbar segment 64 is arranged between the two first busbar segments 63, and the width of the first busbar segment 63 along the first direction A is greater than the width of the second busbar segment 64 along the first direction A.

[0105] The plurality of solder strips 20 includes edge solder strips 23, which are solder strips 20 adjacent to two side edges of the battery sheet 10 along the first direction A, and the edge solder strips 23 are respectively overlapped with two edge solder points 13 adjacent to the edges of the battery sheet 10 along the second direction B. The positive grid line 111 between the two edge solder points 13 forms an electrical connection with the second grid line segment 64 in the positive edge main grid line 61, and the positive grid line 111 between the side edge of the battery sheet 10 along the second direction B to the adjacent edge solder point 13 forms an electrical connection with the first grid line segment 63 in the positive edge main grid line 61. The negative grid line 112 between the two edge solder points 13 is the same, and will not be repeated here.

[0106] The current on the auxiliary grid line 11 between the side edge of the battery sheet 10 along the second direction B to the adjacent edge solder point 13 is collected to the transmission path of the first grid line segment 63, and the current on the auxiliary grid line 11 between the two edge solder points 13 is collected to the transmission path of the second grid line segment 64.

[0107] Therefore, by setting the width of the first grid line segment 63 along the first direction A to be greater than the width of the second grid line segment 64 along the first direction A, the efficiency of the first grid line segment 63 collecting the current on the auxiliary grid line 11 between the edge solder point 13 and the edge of the battery sheet 10 can be improved, the resistance of the first grid line segment 63 can be reduced, the service life and reliability of the edge main grid line 60 can be prolonged, and the working efficiency and output power of the battery assembly 100 can be improved.

[0108] According to some embodiments of the present application, the width of the first grid line segment 63 along the first direction A is L3, and L3 satisfies: 50μm≤L3≤500μm; the width of the second grid line segment 64 along the first direction A is L4, and L4 satisfies: 0<L4≤50μm.

[0109] When the width of the first grid line segment 63 along the first direction A is less than 50μm, the width of the first grid line segment 63 along the first direction A is small, which may cause the resistance of the first grid line segment 63 to increase and the current transmission efficiency of the first grid line segment 63 to decrease; when the width of the first grid line segment 63 along the first direction A is greater than 500μm, the width of the first grid line segment 63 along the first direction A is large, which may cause the shielding area of the first grid line segment 63 to the battery sheet 10 to be large and the light shielding loss to be large. For example, L3=200μm.

[0110] When the width of the second grid line segment 64 along the first direction A is greater than 50μm, the width of the second grid line segment 64 along the first direction A is large, which may cause the slurry cost to increase, the shielding area of the second grid line segment 64 to the battery sheet 10 to be large, and the light shielding loss to be large. For example, L4=25μm.

[0111] Therefore, by limiting the width range of the first grid line segment 63 along the first direction A and the width range of the second grid line segment 64 along the first direction A, the current transmission efficiency of the first grid line segment 63 can be improved, the production cost can be reduced, the light shielding loss can be reduced, and the photoelectric conversion efficiency and reliability of the battery assembly 100 can be improved while ensuring that the width of the first grid line segment 63 along the first direction A is greater than the width of the second grid line segment 64 along the first direction A.

[0112] According to some embodiments of the present application, at least part of the width of the edge main grid line 60 is equal to the width of the auxiliary grid line 11.

[0113] In this embodiment, the width of the second grid line segment 64 in the edge main grid line 60 along the first direction A is equal to the width of the auxiliary grid line 11 along the second direction B. Therefore, by setting at least part of the width of the edge main grid line 60 along the first direction A to be equal to the width of the auxiliary grid line 11 along the second direction B, the production efficiency of the second grid line segment 64 and the auxiliary grid line 11 can be improved, the stability of current transmission can be ensured, and the reliability of the battery assembly 100 can be improved.

[0114] According to some embodiments of the present application, the width of the edge main grid line 60 along the first direction A is L5, and L5 satisfies: 0 < L5 ≤ 50 μm.

[0115] In this embodiment, when the width of the edge main grid line 60 along the first direction A is greater than 50 μm, the width of the edge main grid line 60 along the first direction A is relatively large, which may increase the cost of the edge main grid line 60 and increase the light shielding area of the edge main grid line 60 on the battery piece 10. For example, L5 = 25 μm.

[0116] Therefore, by limiting the width range of the edge main grid line 60 along the first direction A, the production cost of the battery assembly 100 can be effectively reduced, the light shielding area of the edge main grid line 60 on the battery piece 10 can be reduced, the light shielding loss can be reduced, and the output power and reliability of the battery assembly 100 can be improved.

[0117] According to some embodiments of the present application, as shown in Figure 3 As shown in FIG. 1, the plurality of positive grid lines 111 includes a first positive grid line 16, the first positive grid line 16 is arranged adjacent to the welding point 12 connected with the negative grid line 112 along the first direction A, and the first positive grid line 16 has a first bending segment 161 at one end adjacent to the edge of the battery piece 10 along the first direction A, the first bending segment 161 bends and extends towards the adjacent welding point 12; the plurality of negative grid lines 112 includes a first negative grid line 17, the first negative grid line 17 is arranged adjacent to the welding point 12 connected with the positive grid line 111 along the first direction A, and the first negative grid line 17 has a second bending segment 171 at one end adjacent to the edge of the battery piece 10 along the first direction A, the second bending segment 171 bends and extends towards the adjacent welding point 12.

[0118] The first positive electrode grid line 16 is arranged at two ends of the plurality of solder joints 12 adjacent to the negative electrode edge main grid line 62 along the second direction B, and the first positive electrode grid line 16 is bent towards the adjacent solder joint 12 at one end of the first positive electrode grid line 16 adjacent to the negative electrode edge grid line along the first direction A, that is, the first bending section 161, and the first bending section 161 is arranged spaced apart from the adjacent negative electrode grid line 112 and the negative electrode edge main grid line 62; and the first negative electrode grid line 17 is arranged at two ends of the plurality of solder joints 12 adjacent to the positive electrode edge main grid line 61 along the second direction B, and the first negative electrode grid line 17 is bent towards the adjacent solder joint 12 at one end of the first negative electrode grid line 17 adjacent to the positive electrode edge grid line along the first direction A, that is, the second bending section 171, and the second bending section 171 is arranged spaced apart from the adjacent positive electrode grid line 111 and the positive electrode edge main grid line 61.

[0119] Therefore, by arranging the first bending section 161 and the second bending section 171, the first positive electrode grid line 16 and the first negative electrode grid line 17 can sufficiently collect the current on the battery piece 10, improve the current utilization rate of the battery assembly 100, reduce current loss, avoid the first bending section 161 and the second bending section 171 from being in contact with the negative electrode edge main grid line 62 and the positive electrode edge main grid line 61 respectively, reduce the risk of short circuit, and improve the safety and reliability of the battery assembly 100.

[0120] According to some embodiments of the present application, as shown in Figure 3 The auxiliary grid line 11 is provided with a thickened section 18, and the solder strip 20 is connected with the thickened section 18.

[0121] The auxiliary grid line 11 is provided with a thickened section 18, and the solder strip 20 is connected with the thickened section 18.

[0122] Therefore, the auxiliary grid line 11 is provided with the thickened section 18, which can reduce the resistance of the auxiliary grid line 11, reduce the possibility of current collection to the second grid line section 64, reduce the current transmission path, improve the current transmission efficiency of the auxiliary grid line 11, reduce the possibility of blackening of the edge main grid line 60EL, improve the connection strength of the solder strip 20 and the auxiliary grid line 11, and improve the output power and reliability of the battery assembly 100.

[0123] In the present embodiment, the current on the auxiliary grid line 11 between the two edge solder joints 13 is directly collected to the edge solder strip 23 through the thickened section 18, the width of the second grid line section 64 along the first direction A is smaller than the width of the first grid line section 63 along the first direction A, the possibility of the current on the auxiliary grid line 11 between the two edge solder joints 13 being collected to the solder joint 12 through the second grid line section 64 is reduced, the current transmission path is reduced, and the output power of the battery assembly 100 is improved.

[0124] According to some embodiments of the present application, when the cross-sectional shape of the welding strip 20 is an ellipse or a polygon, the width of the welding strip 20 along the first direction A is L6, and L6 satisfies: 0.1mm≤L6≤3mm; the height of the welding strip 20 along the thickness direction of the battery piece 10, that is, the third direction C, is H2, and H2 satisfies: 0.1mm≤H2≤0.5mm.

[0125] When the width of the welding strip 20 along the first direction A is less than 0.1mm, the width of the welding strip 20 along the first direction A is small, which may result in large resistance and small current transmission efficiency; when the width of the welding strip 20 along the first direction A is greater than 3mm, the width of the welding strip 20 along the first direction A is large, which may result in large shielding area of the welding strip 20 to the battery piece 10, is not conducive to the collection of current on the battery piece 10, and the production cost of the welding strip 20 is high. For example, L6=2mm.

[0126] When the height of the welding strip 20 along the third direction C is less than 0.1mm, the height of the welding strip 20 along the third direction C is small, which may result in low structural strength of the welding strip 20 and low current transmission efficiency of the welding strip 20; when the height of the welding strip 20 along the third direction C is greater than 0.5mm, the height of the welding strip 20 along the third direction C is large, and the current loss of the welding strip 20 is high. For example, H2=0.3mm.

[0127] Alternatively, when the cross-sectional shape of the welding strip 20 is circular, the diameter of the welding strip 20 is D, and D satisfies: 0.1mm≤D≤0.5mm.

[0128] When the diameter of the welding strip 20 is less than 0.1mm, the diameter of the welding strip 20 is too small, the resistance of the welding strip 20 increases, which results in the decrease of the current transmission efficiency of the welding strip 20; when the diameter of the welding strip 20 is greater than 0.5mm, the diameter of the welding strip 20 is too large, which may result in the increase of the cost of the welding strip 20, the increase of the light shielding area of the welding strip 20 to the battery piece 10, the large light shielding loss, and the large lamination height of the battery assembly 100. For example, D=0.2mm.

[0129] Therefore, by limiting the size range of the welding strip 20, the current transmission efficiency of the welding strip 20 can be improved, the output power of the battery assembly 100 can be improved, the lamination height of the battery assembly 100 can be avoided to be too large, and the safety and reliability of the battery assembly 100 can be improved.

[0130] According to some embodiments of the present application, as shown in Figure 2 The battery assembly 100 further comprises: a plurality of main grid lines 70, the main grid lines 70 extend along the second direction B and are spaced along the first direction A, and the main grid lines 70 are arranged between the welding strip 20 and the welding point 12.

[0131] Optionally, the plurality of main grid lines 70 are arranged at intervals along the first direction A, the battery assembly 100 adopts a main grid battery design, the main grid line 70 is arranged between the battery piece 10 and the welding strip 20 along the third direction C, and the main grid line 70 is arranged between two edge welding points 13 adjacent to the edges of the battery piece 10 along the second direction B and is welded with the edge welding points 13, and the main grid line 70 can transmit the current on the auxiliary grid line 11 to the bus bar 30 through the welding strip 20.

[0132] In the embodiment, no main grid line 70 is arranged between the edge welding strip 23 and the battery piece 10 along the first direction A, that is, the edge welding strip 23 is connected with the auxiliary grid line 11 through the welding point 12. The edge welding strip 23 is directly connected with the auxiliary grid line 11.

[0133] Optionally, when the battery assembly 100 adopts a main grid-free battery design, the welding strip 20 is connected with the thickened segment 18 on the auxiliary grid line 11, and the welding strip 20 is connected with the auxiliary grid line 11 through the welding point 12, so that the current on the auxiliary grid line 11 is directly transmitted to the bus bar 30 through the welding strip 20.

[0134] The battery string according to the second aspect of the present application comprises the battery assembly 100 according to the first aspect of the present application.

[0135] The photovoltaic module according to the third aspect of the present application comprises the battery assembly 100 according to the first aspect of the present application or the battery string according to the second aspect of the present application.

[0136] The photovoltaic power generation system according to the fourth aspect of the present application comprises the battery assembly 100 according to the first aspect of the present application, the battery string according to the second aspect of the present application, or the photovoltaic module according to the third aspect of the present application.

[0137] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "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.

[0138] In the description of the utility model, "first feature", "second feature" can include one or more features. In the description of the utility model, "multiple" means two or more. In the description of the utility model, "above" or "below" of the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. In the description of the utility model, "above", "above" and "above" of the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0139] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" 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 utility model. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0140] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A battery assembly, comprising: The battery piece is provided with a plurality of sub-grid lines and a plurality of welding points, a plurality of the sub-grid lines extend along a first direction, a plurality of the sub-grid lines are arranged at intervals along a second direction, a plurality of the welding points include a plurality of edge welding points, a plurality of the edge welding points are arranged at intervals along the first direction, the edge welding points are located on the sub-grid lines adjacent to at least one side edge of the battery piece along the second direction, and the first direction and the second direction are perpendicular. A plurality of solder strips extend along the second direction, a plurality of the solder strips are arranged at intervals along the first direction, and a plurality of the solder strips are respectively electrically connected to a plurality of the edge welding points. At least one bus bar is arranged at an edge of the battery piece on a side of the edge welding point along the first direction, the bus bar is electrically connected to a plurality of the edge welding points, and the bus bar and at least part of the solder strip are respectively overlapped on the edge welding point. The overlapped parts of the bus bar and the solder strip on the edge welding point are arranged at intervals.

2. The battery assembly of claim 1, wherein, A plurality of the sub-grid lines include a plurality of positive grid lines and a plurality of negative grid lines, and a plurality of the positive grid lines and a plurality of the negative grid lines are arranged at intervals along the second direction.

3. The battery assembly of claim 1, wherein, A plurality of the solder strips include a plurality of first solder strips and a plurality of second solder strips, a plurality of the first solder strips and a plurality of the second solder strips are arranged at intervals along the first direction, the first solder strips are connected to the positive grid lines, and the second solder strips are connected to the negative grid lines. A plurality of the edge welding points include a plurality of first edge welding points and a plurality of second edge welding points, an end of the first solder strip is overlapped with the first edge welding point, and an end of the second solder strip is overlapped with the second edge welding point. The bus bar is electrically connected to a plurality of the first solder strips through the first edge welding point, the bus bar is insulatively arranged with a plurality of the second edge welding points and a plurality of the second solder strips, a distance between an end of the second solder strip and a corresponding side edge of the bus bar is greater than a distance between an end of the first solder strip and a corresponding side edge of the bus bar; or The bus bar is electrically connected to a plurality of the second solder strips through the second edge welding point, the bus bar is insulatively arranged with a plurality of the first edge welding points and a plurality of the first solder strips, a distance between an end of the first solder strip and a corresponding side edge of the bus bar is greater than a distance between an end of the second solder strip and a corresponding side edge of the bus bar. When the bus bar is electrically connected to a plurality of the first solder strips through the first edge welding point and the bus bar is insulatively arranged with a plurality of the second edge welding points and a plurality of the second solder strips, a distance between the second edge welding point and a corresponding side edge of the battery piece is greater than a distance between the first edge welding point and a corresponding side edge of the battery piece; or 4. The battery assembly of claim 3, wherein, When the bus bar is electrically connected to a plurality of the second solder strips through the second edge welding point and the bus bar is insulatively arranged with a plurality of the first edge welding points and a plurality of the first solder strips, a distance between the first edge welding point and a corresponding side edge of the battery piece is greater than a distance between the second edge welding point and a corresponding side edge of the battery piece. Further comprising:

5. The battery assembly of claim 4, wherein, ​ An insulating piece is arranged between the bus bar and the plurality of second edge solder points and the plurality of second solder strips when the bus bar is electrically connected to the plurality of second solder strips through the second edge solder points. An insulating piece is arranged between the bus bar and the plurality of first edge solder points and the plurality of first solder strips when the bus bar is electrically connected to the plurality of first solder strips through the first edge solder points.

6. The battery assembly of claim 1, wherein, An end of the edge solder point adjacent to the corresponding side edge of the battery piece in the first direction has a width greater than that of another end of the edge solder point in the first direction.

7. The battery assembly of claim 1, wherein, The edge solder point comprises a first connecting portion and a second connecting portion connected to each other along the second direction, the bus bar is overlapped on the first connecting portion, and the end of the solder strip is overlapped on the second connecting portion.

8. The battery assembly of claim 7, wherein, The width of the second connecting portion decreases along the second direction away from the first connecting portion.

9. The battery assembly of claim 7, wherein, The width of the first connecting portion remains unchanged along the second direction.

10. The battery assembly of claim 1, wherein, Further comprising: An edge solder point connecting line is connected between the edge solder point and the corresponding side edge of the battery piece along the second direction, and the edge solder point connecting line is electrically connected to the auxiliary grid line between the edge solder point and the corresponding side edge of the battery piece.

11. The battery assembly of claim 10, wherein, The height of the edge solder point connecting line along the thickness direction of the battery piece is H1, and the H1 satisfies: 0 < H1 ≤ 15 μm; and / or, The height of the solder strip along the thickness direction of the battery piece is H2, and the H2 satisfies: 0.1 mm ≤ H2 ≤ 0.5 mm.

12. The battery assembly of claim 10, wherein, The width of the edge solder point connecting line along the first direction is L1, and the L1 satisfies: 0 < L1 ≤ 0.3 mm; and / or, The width of the solder strip along the first direction is L2, and the L2 satisfies: 0.1 mm ≤ L2 ≤ 3 mm.

13. The battery assembly of claim 1, wherein, Further comprising: An edge main grid line is arranged at the edge of the battery piece along the first direction, and the edge main grid line is electrically connected to the solder point adjacent to the edge of the battery piece among the plurality of solder points along the first direction.

14. The battery assembly of claim 13, wherein, The edge main grid line comprises: A first grid line segment is arranged adjacent to the edge of the battery piece along the second direction; A second grid line segment is connected to the first grid line segment, and the width of the first grid line segment along the first direction is greater than that of the second grid line segment along the first direction.

15. The battery assembly of claim 14, wherein, The width of the first grid line segment is L3, and the L3 satisfies: 50 μm ≤ L3 ≤ 500 μm; The width of the second grid line segment is L4, and the L4 satisfies: 0 < L4 ≤ 50 μm.

16. The battery assembly of claim 13, wherein, At least part of the width of the edge main grid line is equal to the width of the auxiliary grid line.

17. The battery assembly of claim 13, wherein, The width of the edge main grid line along the first direction is L5, and the L5 satisfies: 0 < L5 ≤ 50 μm.

18. The battery assembly of claim 3, wherein, The plurality of positive grid lines comprises a first positive grid line, the first positive grid line is arranged adjacent to the welding spot connected with the negative grid line along the first direction, and the first positive grid line has a first bending segment adjacent to one end of the edge of the battery piece along the first direction, the first bending segment extends towards the adjacent welding spot; The plurality of negative grid lines comprises a first negative grid line, the first negative grid line is arranged adjacent to the welding spot connected with the positive grid line along the first direction, and the first negative grid line has a second bending segment adjacent to one end of the edge of the battery piece along the first direction, the second bending segment extends towards the adjacent welding spot.

19. The battery assembly of claim 1, wherein, The auxiliary grid line is provided with a thickened segment, and the welding strip is connected with the thickened segment.

20. The battery assembly of claim 1, wherein, The width of the welding strip along the first direction is L6, and the L6 satisfies: 0.1mm≤L6≤3mm; The height of the welding strip along the thickness direction of the battery piece is H2, and the H2 satisfies: 0.1mm≤H2≤0.5mm; or, The diameter of the welding strip is D, and the D satisfies: 0.1mm≤D≤0.5mm.

21. The battery assembly of any one of claims 1-20, wherein, Further comprising: A plurality of main grid lines, the main grid lines extend along the second direction and are spaced along the first direction, and the main grid lines are arranged between the welding strip and the welding spot.

22. A string of batteries, characterized by The battery assembly according to any one of claims 1-21.

23. A photovoltaic module, characterized by, The battery assembly according to any one of claims 1-21, or the battery string according to claim 21.

24. A photovoltaic power system, characterized by The battery assembly according to any one of claims 1-21, or the battery string according to claim 22, or the photovoltaic assembly according to claim 23.

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