Photovoltaic module and photovoltaic system

Abstract

The embodiment of the present application provides a photovoltaic module and a photovoltaic system. The photovoltaic module includes a battery module; the battery module includes a plurality of battery strings, the battery string includes a battery string, the interconnection bar in the battery string connects the plurality of battery cells in series by welding and extends from the end of the battery string; the first collector electrode and the second collector electrode of the battery cell are both located on the back of the substrate; an intermediate bus bar is provided between the first battery string group and the second battery string group in the battery string group, the intermediate bus bar is electrically connected to the interconnection bar extending from the end of the battery string, and the intermediate bus bar has a bending portion; the adjacent interconnection bars on the same battery cell are respectively connected to the collector electrodes of different polarities and the spacing between the adjacent interconnection bars is L, the minimum distance between an interconnection bar adjacent to the bending portion and the bending portion is D1, and the photovoltaic module satisfies: 3mm<D1<13mm; or, L<D1<2L. The embodiment of the present application can reduce the risk of cold welding and short circuit of the photovoltaic module.

Description

Technical Field

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

[0002] In the photovoltaic module manufacturing process, the ends of the interconnection bars used for string welding to form battery strings are overlap-welded together with the bus bars. At the same time, the ends of the bus bars are bent and passed through the wire outlet holes on the back panel to be connected to the junction box.

[0003] During this process, the busbar involves multiple bending and smoothing operations. The bent part of the busbar is close to the interconnection bar at the edge of the battery cell, which can easily lead to poor contact between the busbars and the interconnection bars, or cause a short circuit in the lead-out lines of adjacent interconnection bars.

[0004] Therefore, there is an urgent need to redesign the arrangement of cells in photovoltaic modules to eliminate the poor contact between bus bars and interconnect bars and the risk of short circuit. Utility Model Content

[0005] The present application provides a photovoltaic module and a photovoltaic system, aiming to solve the problems of poor contact between bus bars and interconnection bars and the risk of short circuit.

[0006] An embodiment of the present application provides a photovoltaic assembly, the photovoltaic assembly comprising a battery module;

[0007] The battery module includes a plurality of battery string groups, wherein the battery string groups include battery strings arranged at intervals along a first direction of the photovoltaic module, wherein the battery string includes an interconnection bar and a plurality of battery sheets, wherein the interconnection bar connects the plurality of battery sheets in series by welding and extends from an end of the battery string;

[0008] The battery cell comprises: a substrate, the substrate having a first side and a second side perpendicular to each other; a plurality of collector electrodes, the extension direction of the collector electrodes is perpendicular to the first side, the plurality of collector electrodes include a first collector electrode and a second collector electrode, and the first collector electrode and the second collector electrode are both located on the back side of the substrate; adjacent interconnecting bars located on the same battery cell are respectively connected to collector electrodes of different polarities and the spacing between adjacent interconnecting bars is L;

[0009] The battery string group includes a first battery string group and a second battery string group, the first battery string group and the second battery string group are arranged at intervals along the second direction of the photovoltaic module, an intermediate bus bar is arranged between the first battery string group and the second battery string group, the intermediate bus bar is electrically connected to the interconnection bar extending from the end of the battery string, and the intermediate bus bar has a bending portion;

[0010] Adjacent interconnecting bars on the same battery cell are respectively connected to collector electrodes of different polarities and the distance between adjacent interconnecting bars is L, and the distance between an interconnecting bar adjacent to the bending portion and the bending portion is D1, wherein D1 is the shortest distance along the length direction of the intermediate bus bar;

[0011] The photovoltaic module satisfies: 3mm<D1<13mm; or, L<D1<2L.

[0012] Optionally, an extension direction of a portion where the interconnection bar overlaps the middle bus bar is perpendicular to a length direction of the middle bus bar.

[0013] Optionally, an extension direction of a portion where the interconnection bar overlaps the middle bus bar is obliquely intersected with a length direction of the middle bus bar.

[0014] Optionally, the interconnection bar comprises a first interconnection bar connected to the first collector electrode and a second interconnection bar connected to the second collector electrode;

[0015] The first interconnection bars and the second interconnection bars are alternately arranged along the length direction of the middle bus bar; the first interconnection bars extend from the ends of the battery string and are welded to the middle bus bar, and the second interconnection bars are disconnected from the middle bus bar.

[0016] Optionally, in two adjacent battery strings, a second interconnection bar is distributed between two first interconnection bars close to the bending portion.

[0017] Optionally, along the length direction of the middle bus bar, the distance between two first interconnecting bars in two adjacent battery strings and close to the bending portion is S; the distance between the bending portions of two adjacent middle bus bars is D2;

[0018] The ratio of D2 to S satisfies 0.108<D2 / S<0.646; or, 2mm<D2<12mm.

[0019] Optionally, in two adjacent battery strings, two second interconnection bars are distributed between two first interconnection bars close to the bending portion.

[0020] Optionally, along the length direction of the middle bus bar, the distance between two first interconnecting bars in two adjacent battery strings and close to the bending portion is S; the distance between the bending portions of two adjacent middle bus bars is D2;

[0021] The ratio of D2 to S satisfies 0.069<D2 / S<0.415; or, 2mm<D2<12mm.

[0022] Optionally, the width of the middle bus bar is L1, 3mm<L1<8mm; and / or,

[0023] The width of the gap area between the first battery string group and the second battery string group is L2, 7mm<L2<16mm.

[0024] Optionally, the photovoltaic module further comprises a back plate, and the back plate is provided with a wire outlet hole;

[0025] The outlet hole is located in the gap area between the first battery string group and the second battery string group, and the outlet hole is located between two adjacent middle bus bars;

[0026] Two adjacent intermediate bus bars are bent and extend out from the same outlet hole.

[0027] Optionally, three outlet holes are provided on the back plate, and the three outlet holes are arranged along the length direction of the middle bus bar;

[0028] Among the three outlet holes, the shape of the outlet hole in the middle is different from the shape of the outlet holes on both sides; and / or,

[0029] The outlet hole located in the middle of the three outlet holes has a long axis and a short axis that are perpendicular to each other, the long axis is parallel to the length direction of the middle bus bar, and the short axis is parallel to the width direction of the middle bus bar; and / or,

[0030] The cross-sectional shape of the outlet hole located in the middle of the three outlet holes includes a first arc, a second arc, a third arc and a fourth arc, the first arc and the second arc are symmetrical with respect to the minor axis and are cocircular, and the third arc and the fourth arc are symmetrical with respect to the major axis and are coelliptical; and / or,

[0031] The battery sheet has a chamfered structure at a position close to the wire outlet hole.

[0032] Optionally, the photovoltaic assembly further comprises a junction box, the junction box is fixed at the location of the outlet hole, and the intermediate bus bar is electrically connected to the junction box;

[0033] The overlap area between the junction box and any of the four solar cells around the outlet hole does not exceed 300mm 2 .

[0034] Optionally, along the length direction of the intermediate bus bar, the distance between the edge of the junction box and the edge of the outlet hole is not less than 23.5 mm; and / or,

[0035] Along the width direction of the middle bus bar, the distance between the edge of the junction box and the edge of the outlet hole is not less than 6.5 mm.

[0036] Optionally, the battery cell includes a 0BB battery cell or a MBB battery cell.

[0037] Optionally, the length of the photovoltaic module is greater than 1797 mm and less than 1805 mm; or,

[0038] The length of the photovoltaic module is greater than 1957 mm and less than 1967 mm; or,

[0039] The length of the photovoltaic module is greater than 1989 mm and less than 1996 mm.

[0040] Optionally, the length of the battery cell is 96±3 mm; or,

[0041] The length of the battery cell is 105±3 mm; or

[0042] The width of the battery cell is 182.2±5 mm.

[0043] Optionally, the number of main grids provided on each of the solar cells is greater than 16 and less than 20; and / or,

[0044] Each of the solar cells is provided with a plurality of main grids, and the number of the welding pads provided on each main grid is greater than 6 and less than 9; and / or,

[0045] The number of positive electrode fine grids provided on each of the battery cells is greater than 98 and less than 103; and / or,

[0046] The number of negative electrode fine grids provided on each of the battery cells is greater than 99 and less than 104; and / or,

[0047] A plurality of fine grids are arranged on each of the battery cells, and the distance between two adjacent fine grids with the same polarity is greater than 0.92 mm and less than 0.96 mm.

[0048] Optionally, a plurality of battery cells form a plurality of battery strings;

[0049] The string spacing between two adjacent battery strings is greater than 0.8 mm and less than 2 mm; and / or,

[0050] The spacing between two adjacent battery cells in the same battery string is greater than 0.5 mm and less than 2 mm; and / or,

[0051] The string spacing between two adjacent battery strings is greater than the cell spacing between two adjacent battery cells in the same battery string.

[0052] The present application also provides a photovoltaic system, comprising a plurality of any of the aforementioned photovoltaic components arranged in an array.

[0053] Optionally, the photovoltaic module is glued to a building; or,

[0054] The photovoltaic module is fixed to the building via a connector; or,

[0055] The photovoltaic components are mounted on the building.

[0056] In the embodiment of the present application, by designing the minimum distance D1 between the interconnection bar 1011 and the bent portion 11a of the middle bus bar 11 in the photovoltaic module, so that the minimum distance D1 satisfies 3mm<D1<13mm or L<D1<2L, the risk of cold soldering and short circuit of the photovoltaic module can be reduced at the same time, and the yield rate and service life of the photovoltaic module can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0058] Figure 1 A schematic diagram of the arrangement of cells of a photovoltaic module in an embodiment of the present application is shown;

[0059] Figure 2 A schematic diagram of the arrangement of cells of another photovoltaic module in an embodiment of the present application is shown;

[0060] Figure 3 A schematic diagram of a battery cell in an embodiment of the present application is shown;

[0061] Figure 4 In the embodiment of the present application, Figure 1 A local enlarged schematic diagram of the I position;

[0062] Figure 5 In the embodiment of the present application, Figure 2 A local enlarged schematic diagram of the II position;

[0063] Figure 6 A simplified cross-sectional view of a photovoltaic module at a cable outlet hole in an embodiment of the present application is shown;

[0064] Figure 7 Another photovoltaic module according to the embodiment of the present application is shown. Figure 2 A local enlarged schematic diagram of the II position;

[0065] Figure 8 A schematic diagram showing a shape of a wire outlet hole in an embodiment of the present application is shown;

[0066] Fig. 9 In the embodiment of the present application, Figure 2 A local enlarged schematic diagram of the III position;

[0067] Fig.10 In the embodiment of the present application, Figure 2 A local enlarged schematic diagram of position IV.

[0068] Description of the accompanying drawings:

[0069] Battery string group-10, first battery string group-10a, second battery string group-10b, battery string-101, interconnection bar-1011, main section-1011a, extension section-1011b, first interconnection bar-10111, second interconnection bar-10112, battery cell-1012, substrate-10121, first edge-1012a, second edge-1012b, collector electrode 10122, middle bus bar-11, bend-11a, back plate-20, wire outlet hole-201, first arc line-201a, second arc line-201b, third arc line-201c, fourth arc line-201d, junction box-30. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0071] Reference Figures 1 to 5 , an embodiment of the present application provides a photovoltaic assembly, the photovoltaic assembly comprising a battery module;

[0072] The battery module includes at least two battery string groups 10, the battery string group 10 includes battery strings 101 arranged at intervals along the first direction X of the photovoltaic module, the battery string 101 includes an interconnection bar 1011 and a plurality of battery cells 1012, the interconnection bar 1011 connects the plurality of battery cells 1012 in series by welding and extends from the end of the battery string 101;

[0073] The battery cell 1012 includes: a substrate 10121, the substrate 10121 having a first side 1012a and a second side 1012b perpendicular to each other; a plurality of collector electrodes 10122, the extension direction of the collector electrodes 10122 is perpendicular to the first side 1012a, the plurality of collector electrodes 10122 include a first collector electrode and a second collector electrode, the first collector electrode and the second collector electrode have different polarities, and the first collector electrode and the second collector electrode are both located on the back side of the substrate 10121;

[0074] The battery string group 10 includes a first battery string group 10a and a second battery string group 10b, the first battery string group 10a and the second battery string group 10b are arranged at intervals along the second direction Y of the photovoltaic module, an intermediate bus bar 11 is arranged between the first battery string group 10a and the second battery string group 10b, the intermediate bus bar 11 is electrically connected to the interconnection bar 1011 extending from the end of the battery string 101, and the intermediate bus bar 11 has a bent portion 11a;

[0075] Adjacent interconnecting bars on the same battery cell 1012 are respectively connected to collector electrodes of different polarities and the distance between adjacent interconnecting bars is L, and the distance between an interconnecting bar 1011 adjacent to the bending portion and the bending portion 11a is D1, wherein D1 is the shortest distance along the length direction of the intermediate bus bar 11;

[0076] The photovoltaic module satisfies: 3mm<D1<13mm; or, L<D1<2L.

[0077] like Figure 1 or Figure 2 As shown, a schematic diagram of a photovoltaic module of an embodiment of the present application is shown, in which a battery module for realizing photoelectric conversion to output a photocurrent is included, and the battery module includes at least two battery string groups 10, each battery string group 10 includes multiple battery strings 101, and each battery string 101 includes multiple battery cells 1012, and the multiple battery cells 1012 are connected together by interconnection bars 1011 to form a battery string 101. Multiple battery strings 101 are parallel to each other and are arranged at intervals along the first direction X shown in the figure to form a battery module. For a rectangular photovoltaic module, the first direction X can be its width direction or length direction. The interconnection bar 1011 extends from the end of the battery string 101 and can be welded to the bus bars located at both ends of the battery string 101, and the bus bars collect the photocurrent in the battery string 101 from both ends of the battery string 101.

[0078] like Figure 3The schematic diagram is a schematic diagram of the battery cell 1012 in the embodiment of the present application. The battery cell 1012 can be an n-slice battery obtained by cutting a complete battery cell. The battery cell 1012 includes a substrate 10121 made of silicon material. The substrate 10121 has a first side 1012a and a second side 1012b that are perpendicular to each other. In the n-slice battery, the first side 1012a and the second side 1012b are one long side and the other short side. A plurality of collector electrodes 10122 are processed on the back of the substrate 10121 by screen printing or electroplating. The extension direction of the plurality of collector electrodes 10122 is perpendicular to the first side 1012a of the substrate 10121. Specifically, the plurality of collector electrodes 10122 include a first collector electrode and a second collector electrode, one of the first collector electrode and the second collector electrode is a positive electrode, and the other is a negative electrode, and the length directions of the first collector electrode and the second collector electrode are parallel to the second side 1012b, along the length direction of the first side 1012a, the first collector electrode and the second collector electrode are arranged alternately, and the collector electrodes of the same polarity are electrically connected to the same interconnection strip. The above-mentioned collector electrode 10122 can be a grid line with a narrow width or a thin diameter, which can be called a fine grid or a sub-grid, which is used to disperse the current between the P region and the N region at various places on the back of the battery cell 1012. It can be seen that in the embodiment of the present application, the collector electrode 10122 is distributed on the back of the battery cell 1012, which can avoid blocking light when the electrode is set on the front, which helps to improve the photoelectric conversion rate.

[0079] For example, on the back side of the substrate 10121, multiple interconnection bars 1011 can extend in a direction parallel to the first edge 1012a to connect multiple battery cells 1012 in series, and adjacent interconnection bars 1011 located on the same battery cell 1012 are respectively connected to collector electrodes of different polarities. For example, the interconnection bar 1011 is connected to the first collector electrode, and the interconnection bar 1011 adjacent to it is connected to the second collector electrode. Therefore, adjacent interconnection bars collect different types of carriers (electrons or holes).

[0080] like Figure 1 or Figure 2As shown in the figure, the battery string group 10 includes a first battery string group 10a and a second battery string group 10b. The first battery string group 10a and the second battery string group 10b are arranged at intervals along the second direction Y of the photovoltaic module. For a rectangular photovoltaic module, when the first direction X can be its width direction, the second direction Y can be its length direction. An intermediate bus bar 11 is arranged at the gap position between the first battery string group 10a and the second battery string group 10b. The interconnection bar 1011 in the first battery string group 10a extends from the end of the corresponding battery string 101 and is welded to the intermediate bus bar 11. The interconnection bar 1011 in the second battery string group 10b extends from the end of the corresponding battery string 101 and is welded to the intermediate bus bar 11. The intermediate bus bar 11 collects the current in the battery strings 101 on both sides at the same time.

[0081] Combination Figures 4 to 6 As shown in FIG. 1 , the intermediate bus bar 11 has a bent portion 11a for electrically connecting to the junction box, and the bent portion 11a can form an angle of about 90° with the main body of the intermediate bus bar 11 after being bent. Two adjacent intermediate bus bars 11 are connected to the same junction box at the same time after being bent, transmitting the current of the component to the junction box.

[0082] like Figure 4 or Figure 5 , adjacent interconnecting bars 1011 on the same cell 1012 are respectively connected to collector electrodes of different polarities and the distance between adjacent interconnecting bars is L, that is, L represents the distance between two interconnecting bars 1011 that are adjacent to each other and collect different types of carriers on any cell 1012. Figure 1 or Figure 2 As shown in the diagram, along the first direction X, the interconnection bars 1011 at different positions are at different distances from the bend 11a. The interconnection bars 1011 that are close to the bend 11a are more likely to overlap the concave gap formed by the bend 11a and the main part of the middle bus bar 11 during welding, resulting in a risk of cold welding. The interconnection bars 1011 that are far from the bend 11a have a lower or even non-existent risk. Therefore, based on this, the present application is specifically designed for the distance D1 between the interconnection bar 1011 that is adjacent to the bend 11a and the bend 11a, and D1 is the shortest distance along the length direction of the middle bus bar 11, that is, no matter in what shape and direction the interconnection bar 1011 extends and overlaps the middle bus bar 11, the narrowest distance between the bend 11a and the interconnection bar 1011 in the first direction X is designed and controlled.

[0083] Combination Figure 6It should be noted that when D1 is small, the welding of the interconnection bar 1011 and the intermediate bus bar 11 is likely to cause a defect of cold welding. When D1 is large, the bending portions 11a of the two adjacent interconnection bars 1011 are close to each other. In the process of manufacturing components, after repeated bending and connection with the junction box, the two bending portions 11a are easy to contact and cause a short circuit, resulting in damage to the battery cell. By calculating the arrangement of component products of a certain version, D1 greater than 3mm can reduce the risk of cold welding, and D1 less than 13mm can reduce the risk of short circuit. In this version of the component, D1 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, etc. The specific value of D1 can be determined by comprehensively measuring the string spacing between adjacent battery strings 101, the spacing between adjacent intermediate bus bars 11, the bending length of the bending portion 11a and other parameters. The specific value of D1 is not limited in the embodiment of the present application.

[0084] Optionally, when the layout of the component changes, based on the above-mentioned design basis for D1, D1 can also be designed to be any value greater than L and less than 2L in the embodiment of the present application. For example, D1 can be 1.1L, 1.2L, 1.3L, 1.4L, 1.5L, 1.6L, 1.7L, 1.8L, 1.9L, etc. When L<D1<2L, the risk of cold welding of the interconnection bars and the middle bus bars in other layouts of the components can be reduced, and the risk of short circuit of two adjacent middle bus bars can be reduced at the same time.

[0085] Therefore, in the embodiment of the present application, by designing the minimum distance D1 between the interconnection bar 1011 adjacent to the bent portion 11a of the middle bus bar 11 in the photovoltaic module and the bent portion 11a, so that the minimum distance D1 satisfies 3mm<D1<13mm or L<D1<2L, the risk of cold soldering and short circuit of the photovoltaic module can be reduced at the same time, and the yield rate and service life of the photovoltaic module can be improved.

[0086] Optionally, refer to Figure 4 or Figure 5 The extending direction of the portion where the interconnection bar 1011 overlaps the middle bus bar 11 is perpendicular to the length direction of the middle bus bar 11 .

[0087] Specifically, if Figure 4 or Figure 5As shown, the interconnection bar 1011 in the embodiment of the present application may include a main body section 1011a located entirely on the battery cell 1012 and an extension section 1011b extending outward from the main body section 1011a to the middle bus bar 11. In one embodiment, the main body section 1011a and the extension section 1011b may be located on the same straight line and both are parallel to the second direction Y of the component, that is, the length direction of the interconnection bar 1011 and the middle bus bar 11 are perpendicular to each other. In combination with the diagram, it is easy to understand that the distance D1 between the interconnection bar 1011 and the bend 11a is equal at all locations. At this time, the interconnection bar 1011 does not need to be bent, and the risk of damage to the interconnection bar 1011 is low.

[0088] Optionally, refer to Figure 7 The extending direction of the portion where the interconnection bar 1011 overlaps the middle bus bar 11 is obliquely intersected with the length direction of the middle bus bar 11 .

[0089] Specifically, if Figure 7 As shown, the interconnection bar 1011 in the embodiment of the present application may include a main body section 1011a that is entirely located on the battery cell 1012 and an extension section 1011b that extends outward from the main body section 1011a to the middle bus bar 11. In one embodiment, the main body section 1011a may be parallel to the second direction Y of the assembly, and the extension section 1011b is bent and tilted relative to the main body section 1011a in a direction away from the bend 11a, and then extends to the middle bus bar 11. In combination with the diagram, it is easy to understand that the minimum distance D1 between the interconnection bar 1011 and the bend 11a should be the distance between the part where the interconnection bar 1011 just overlaps the middle bus bar 11 and the bend 11a. At this time, the interconnection bar 1011 with this bending design can be better applied to the situation where the edge interconnection bar 1011 is close to the side of the battery cell 1012, which can reduce the quality defects of this battery cell 1012 when making assemblies.

[0090] Optionally, refer to Figure 1 or Figure 2 , the interconnection bar 1011 includes a first interconnection bar 10111 and a second interconnection bar 10112, the first interconnection bar 10111 is electrically connected to the first collector electrode, and the second interconnection bar 10112 is electrically connected to the second collector electrode;

[0091] Along the length direction of the intermediate bus bar 11 , the first interconnection bar 10111 and the second interconnection bar 10112 are alternately arranged; the first interconnection bar 10111 extends from the end of the battery string 101 and is welded to the intermediate bus bar 11 , and the second interconnection bar 10112 is disconnected from the intermediate bus bar 11 .

[0092] Specifically, if Figure 1 or Figure 2 As shown, the interconnection bar 1011 in the embodiment of the present application may include interconnection bars 1011 for collecting different types of carriers, namely, a first interconnection bar 10111 and a second interconnection bar 10112. The first interconnection bar 10111 and the second interconnection bar 10112 may be arranged along the second direction Y of the component, and in the length direction of the middle bus bar 11, the first interconnection bar 10111 and the second interconnection bar 10112 are arranged in an alternating manner at intervals, and the first interconnection bar 10111 and the second interconnection bar 10112 are respectively connected to collector electrodes 10122 of different polarities, that is, the first interconnection bar 10111 is connected to the first collector electrode, and the second interconnection bar 10112 is connected to the second collector electrode. As two interconnecting bars for collecting different types of carriers, the first interconnecting bar 10111 extends from the end of the battery string 101 and is welded to the middle bus bar 11, and the current of this part of the collector electrode 10122 is collected by the middle bus bar 11. The second interconnecting bar 10112 is disconnected from the same middle bus bar 11 and can be extended from the other end of the battery string 101 and welded to the edge bus bar of the component. To facilitate the introduction of the scheme of the present application, the following embodiments will be described by taking the first collector electrode connected to the first interconnecting bar 10111 as the negative electrode and the second collector electrode connected to the second interconnecting bar 10112 as the positive electrode as an example.

[0093] Optionally, refer to Figure 4 In two adjacent battery strings 101, one second interconnection bar 10112 is distributed between two first interconnection bars 10111 close to the bending portion 11a.

[0094] Specifically, there are various arrangements of the battery cells 1012 in the battery module on the assembly, such as Figure 4 As shown, an arrangement of the battery cells 1012 in an embodiment is given. It can be seen from the figure that the spacing between the first interconnection bar 10111 and the second interconnection bar 10112 on the same battery cell 1012 is L. In the two adjacent battery strings 101 on the left and right, the spacing between the second interconnection bar 10112 located at the edge of the left battery cell 1012 and the first interconnection bar 10111 located at the edge of the right battery cell 1012 is M1, M1<L. When the middle bus bar 11 is used to weld with the first interconnection bar 10111, according to the arrangement shown in the figure, in the two adjacent battery strings 101, a second interconnection bar 10112 is distributed between the two first interconnection bars 10111 close to the bending portion 11a. That is, the spacing S between the two first interconnection bars 10111 satisfies L<(S=L+M1)<2L. At this time, the battery cells 1012 can be arranged more closely to increase the proportion in the component. Exemplarily, S may be any value between 16 mm and 20 mm, S=16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0095] Optionally, refer to Figure 4 , along the length direction of the middle bus bar 11, the distance between two first interconnecting bars 10111 in two adjacent battery strings 101 and close to the bending portion 11a is S; the distance between the bending portions 11a of two adjacent middle bus bars 11 is D2;

[0096] The ratio of D2 to S satisfies 0.108<D2 / S<0.646; or, 2mm<D2<12mm.

[0097] Specifically, if Figure 4 As shown in FIG. 1 , the spacing between the bends 11a of two adjacent intermediate bus bars 11 is D2. When L<(S=L+M1)<2L, the ratio between D2 and S can be further constrained so that the first interconnection bar 10111 can be reliably welded to the intermediate bus bar 11 and sufficient insulation gap can be retained between adjacent bends 11a. For example, when S=18.59mm and D2 is between 2mm and 12mm, 0.108<D2 / S<0.646.

[0098] Optionally, when the size and other parameters of the battery cell 1012 change, the Figure 4 In the schematic arrangement, D2 may also be greater than 2 mm and less than 12 mm, for example, D2 = 3 mm, 5 mm, 6 mm, 8 mm, 9 mm, 10 mm or 11 mm. At this time, for other components, the first interconnection bar 10111 can be reliably welded to the middle bus bar 11, and sufficient insulation gaps can be retained between adjacent bent portions 11a.

[0099] Optionally, refer to Figure 5 In two adjacent battery strings 101, two second interconnection bars 10112 are distributed between two first interconnection bars 10111 close to the bending portion 11a.

[0100] Specifically, there are various arrangements of the battery cells 1012 in the battery module on the assembly. As shown in Figure 5, an arrangement of the battery cells 1012 in an embodiment is given. It can be seen from the figure that the spacing between the first interconnection bar 10111 and the second interconnection bar 10112 on the same battery cell 1012 is L. In the two adjacent battery strings 101 on the left and right, the spacing between the second interconnection bar 10112 located at the edge of the left battery cell 1012 and the second interconnection bar 10112 located at the edge of the right battery cell 1012 is M2. When the middle bus bar 11 is used for welding with the negative electrode interconnection bar, according to the arrangement shown in the figure, in the adjacent two battery strings 101, two second interconnection bars 10112 are distributed between the two first interconnection bars 10111 near the bending portion 11a. That is, the spacing S between the two first interconnection bars 10111 satisfies (S=2L+M2)>2L. At this time, the components can form another new arrangement, and S is also larger and easier to avoid the bending portion 11a. For example, S can be any value between 25mm and 30mm, S = 25mm, 26mm, 27mm, 28mm, 29mm or 30mm.

[0101] Optionally, refer to Figure 5 , along the length direction of the middle bus bar 11, the distance between two first interconnecting bars 10111 in two adjacent battery strings 101 and close to the bending portion 11a is S; the distance between the bending portions of two adjacent middle bus bars 11 is D2;

[0102] The ratio of D2 to S satisfies 0.069<D2 / S<0.415; or, 2mm<D2<12mm.

[0103] Specifically, if Figure 5 As shown in FIG. 1 , the spacing between the bends 11a of two adjacent intermediate bus bars 11 is D2. When 2L<S, the ratio between D2 and S can be further constrained so that the first interconnection bar 10111 can be reliably welded to the intermediate bus bar 11 and sufficient insulation gap can be retained between adjacent bends 11a. For example, when S=28.92mm and D2 is between 2mm and 12mm, 0.069<D2 / S<0.415.

[0104] Optionally, when the size and other parameters of the battery cell 1012 change, the Figure 5 In the schematic arrangement, D2 may also be greater than 2 mm and less than 12 mm, for example, D2 = 3 mm, 5 mm, 6 mm, 8 mm, 9 mm, 10 mm or 11 mm. At this time, for other components, the first interconnection bar 10111 can be reliably welded to the middle bus bar 11, and sufficient insulation gaps can be retained between adjacent bent portions 11a.

[0105] Optionally, refer to Figure 4 or Figure 5 The width of the middle bus bar 11 is L1, 3mm<L1<8mm.

[0106] Specifically, if Figure 4 or Figure 5 As shown in the figure, in the embodiment of the present application, the width of the middle bus bar 11 used is L1. When L1 is too narrow, it is easy to make the welding between the middle bus bar 11 and the interconnection bar 1011 more difficult and prone to defects. When L1 is too wide, it is easy to occupy too much component area, resulting in waste of component area. Therefore, according to some version parameters, L1 is designed to be greater than 3mm and less than 8mm. For example, L1 can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm or 7mm.

[0107] Optionally, refer to Figure 4 or Figure 5 , the width of the gap area between the first battery string group 10a and the second battery string group 10b is L2, 7mm<L2<16mm.

[0108] Specifically, if Figure 4 or Figure 5 As shown in the example, in the embodiment of the present application, in addition to controlling the product quality by using the width L1 of the middle bus bar 11, the width L2 of the gap area between the first battery string group 10a and the second battery string group 10b can also be constrained so that the gap area can form a sufficient safe creepage distance between the middle bus bar 11 and the battery string 101, and avoid wasting component area due to excessive spacing. Therefore, according to some version parameters, L2 is designed to be greater than 7mm and less than 16mm. For example, L2 can be 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm.

[0109] Optionally, refer to Figure 6 The photovoltaic module further comprises a back plate 20, and the back plate 20 is provided with a wire outlet hole 201;

[0110] The outlet hole 201 is located in the gap area between the first battery string group 10a and the second battery string group 10b, and the outlet hole 201 is located between two adjacent middle bus bars 11;

[0111] Two adjacent intermediate bus bars 11 are bent and extend out from the same outlet hole 201 .

[0112] Specifically, if Figure 6As shown in the embodiment of the present application, whether the backplane 20 is a non-translucent backplane used in a single-glass module or a translucent backplane used in a double-glass module. In order to lead the intermediate bus bar 11 out from the backplane 20 to achieve electrical connection with the junction box on the surface of the backplane 20, a wire outlet hole 201 is opened on the backplane 20. The end of the intermediate bus bar 11 can be bent and passed through the wire outlet hole 201, and then connected to the junction box.

[0113] Combination Figure 4 or Figure 5 As shown in FIG. 1 , the outlet hole 201 on the back plate 20 is located between the two middle bus bars 11, and the battery cells 1012 from different battery strings 101 are distributed around one outlet hole 201. Figure 4 or Figure 5 In the figure, the battery cell 1012 in the upper left corner is a battery cell in a battery string 101 in the first battery string group 10a, the battery cell 1012 in the upper right corner is a battery cell in another battery string 101 in the first battery string group 10a, the battery cell 1012 in the lower left corner is a battery cell in a battery string 101 in the second battery string group 10b, and the battery cell 1012 in the lower right corner is a battery cell in another battery string 101 in the second battery string group 10b. The two left and right middle bus bars 11 are bent and extend out of the outlet hole 201 together.

[0114] Optionally, three outlet holes 201 are provided on the back plate 20, and the three outlet holes 201 are arranged along the length direction of the middle bus bar 11;

[0115] Among the three wire outlet holes 201 , the shape of the wire outlet hole 201 located in the middle is different from the shape of the wire outlet holes 201 located on both sides.

[0116] Specifically, the three outlet holes 501 are arranged at intervals along the length direction Y of the middle bus bar 11 .

[0117] For these outlet holes 201, the shape of the outlet hole 201 in the middle position can be different from the shape of the outlet holes 201 on both sides. For example, the outlet hole 201 in the middle position can be elliptical, quasi-elliptical, or racetrack-shaped or other irregular shapes, and the outlet holes 201 on both sides can be perfect circles.

[0118] Specifically, for photovoltaic modules, the mechanical loads in the middle and near the edge are different, and the mechanical loads corresponding to the outlet holes of different shapes are also different. Based on this, the outlet holes in the middle and the outlet holes on both sides have different shapes, which can be matched according to the load distribution of the module, which is beneficial to improve the stability of the module and prevent hidden cracks.

[0119] Furthermore, for photovoltaic modules, the deformation in the middle is the largest, that is, the mechanical load weak point is in the middle. Since the module is rectangular, the stress distribution of the elliptical hole is more uniform than that of the circular hole, that is, the mechanical load performance of the elliptical hole is better.

[0120] Based on this, the wire outlet hole in the middle is elliptical or quasi-elliptical, and the wire outlet holes on both sides are circular, which is beneficial to improve the stability of the component and prevent hidden cracks.

[0121] Optionally, refer to Figure 8 The outlet hole 201 located in the middle of the three outlet holes 201 has a long axis and a short axis that are perpendicular to each other, the long axis is parallel to the length direction of the middle bus bar 11, and the short axis is parallel to the width direction of the middle bus bar 11.

[0122] Specifically, the long axis of the middle outlet hole 201 is parallel to the length direction of the middle bus bar 11, which can make the stress distribution of the middle outlet hole more uniform, better mechanical load, improve the stability of the component, and prevent hidden cracks. Exemplarily, the length G of the long axis can be 16mm to 18mm, and the length H of the short axis can be 10mm to 12mm.

[0123] Optionally, refer to Figure 8 The cross-sectional shape of the wire outlet hole 201 located in the middle position among the three wire outlet holes 201 includes a first arc line 201a, a second arc line 201b, a third arc line 201c and a fourth arc line 201d, the first arc line 201a and the second arc line 201b are symmetrical with respect to the short axis and are in the same circle, and the third arc line 201c and the fourth arc line 201d are symmetrical with respect to the long axis and are in the same ellipse.

[0124] Specifically, in another example, Figure 8 As shown, the cross-sectional shape of the outlet hole 201 at the middle position can be a closed figure formed by connecting multiple arcs, specifically including a first arc 201a, a second arc 201b, a third arc 201c and a fourth arc 201d, the first arc 201a and the second arc 201b are symmetrical with respect to the short axis and are in a circle, the third arc 201c and the fourth arc 201d are symmetrical with respect to the long axis and are in an ellipse. The discontinuous positions between the first arc 201a, the second arc 201b, the third arc 201c and the fourth arc 201d are smoothly connected by four arcs.

[0125] Specifically, the middle outlet hole includes multiple arcs. This opening shape has smooth features at all parts, which helps to improve the stability of the photovoltaic module and prevent hidden cracks. On the contrary, if it is not a smooth curve, such as a square opening, stress points will appear at the corners, which is prone to hidden cracks.

[0126] In addition, in another example, a chamfered structure may be processed at a position of the battery cell 1012 close to the wire outlet hole 201 to avoid hidden cracks of the battery cell 1012 .

[0127] Optionally, refer to Figure 6 The photovoltaic assembly further includes a junction box 30, the junction box 30 is fixed at the location of the outlet hole 201, and the intermediate bus bar 11 is electrically connected to the junction box 30;

[0128] The overlap area between the junction box 30 and any of the four cells around the outlet hole 201 does not exceed 300 mm 2 .

[0129] Specifically, if Figure 6 As shown, the junction box 30 is fixedly connected to the back of the back plate 20 at a position corresponding to the outlet hole 201, and the junction box 30 as a whole can cover the outlet hole 201. For the junction box 30, the overlapping area of ​​the projection area along the thickness direction of the module and any of the four battery cells around the outlet hole 201 does not exceed 300mm 2 , thus, it is possible to avoid the junction box 30 from forming a large shading area on the back of the module, which is especially important for double-glass modules. For example, in a module of a certain format, the length of the junction box 30 used can be 65mm to 75mm, and the width can be 25mm to 30mm. For example, the size of a junction box 30 is 70.9mm*25*mm*16.8mm.

[0130] Optionally, along the length direction of the intermediate bus bar 11, the distance between the edge of the junction box 30 and the edge of the outlet hole 201 is not less than 23.5 mm.

[0131] Specifically, in one embodiment, in order to prevent the edge of the junction box 30 from being too close to the edge of the outlet hole 201 to form a gap for water vapor to enter, along the length direction of the middle bus bar 11, the distance between the edge of the junction box 30 and the edge of the outlet hole 201 is not less than 23.5 mm, so that the water vapor path can be enlarged, thereby ensuring that a wider barrier area is formed in this direction to isolate water vapor.

[0132] In addition, optionally, along the width direction of the middle bus bar 11, the distance between the edge of the junction box 30 and the edge of the outlet hole 201 is not less than 6.5 mm. In this case, a wider barrier area for isolating water vapor can be formed in another direction.

[0133] Therefore, by designing the edge spacing in the above two directions, the junction box can effectively block water vapor in at least one direction of length and width, thereby ensuring the safe use of the components.

[0134] Optionally, the battery cell 1012 includes a 0BB battery cell or a MBB battery cell.

[0135] Specifically, the cell 1012 used in the embodiment of the present application can be a traditional MBB cell, that is, a multi-grid cell. Accordingly, the interconnection bar 1011 involved in the aforementioned embodiment corresponds to the main grid position welded on the multi-grid cell. In addition, the cell 1012 used in the embodiment of the present application can also be a 0BB cell with fewer or even zero main grids, which is called a busbar-free cell. Whether it is a 0BB cell or an MBB cell, the yield of the photovoltaic module obtained by welding using the interconnection bar 1011 can be improved in accordance with the method disclosed in the aforementioned embodiment.

[0136] Optionally, based on the above-mentioned embodiment, in one implementation manner, the length of the photovoltaic module is greater than 1797 mm and less than 1805 mm. For example, the length may be 1797 mm, 1798 mm, 1799 mm, 1800 mm, 1801 mm, 1802 mm, or 1805 mm. When the length of the module is between 1797 mm and 1805 mm, the length utilization rate of the module for the container (for example, a container with an effective length of 11980 mm) is greater than 90%. Compared with longer photovoltaic modules, the photovoltaic module has higher mechanical load performance and is more flexible in handling and installation.

[0137] Optionally, based on the above-mentioned embodiment, in one implementation manner, the length of the photovoltaic module is greater than 1957 mm and less than 1967 mm. For example, the length may be 1957 mm, 1958 mm, 1959 mm, 1960 mm, 1961 mm, 1962 mm, 1963 mm, 1964 mm, 1965 mm, 1967 mm1. When the length of the module is between 1957 mm and 1967 mm, the length utilization rate of the container (for example, a container with an effective length of 11980 mm) can be greater than 98%, and the length of the module is moderate, and the handling and installation are more flexible.

[0138] Optionally, based on the above-mentioned embodiment, in one implementation manner, the length of the photovoltaic module is greater than 1989 mm and less than 1996 mm. For example, the length may be 1989 mm, 1990 mm, 1992 mm, 1993 mm, 1994 mm, 1995 mm, or 1996 mm. When the length of the module is between 1989 mm and 1996 mm, the length utilization rate of the container (for example, a container with an effective length of 11980 mm) can be greater than 99%, and the length of the module is moderate, so the handling and installation are more flexible.

[0139] The different length ranges of the above components can constitute different size series, which can meet the mechanical load performance requirements and match different installation and use environments respectively.

[0140] Optionally, based on the above embodiment, in one implementation, the length of the battery cell 1012 is 96±3 mm. The length of the battery cell 1012 may be 93 mm, 94 mm, 95 mm, 96 mm, 97 mm, 98 mm, or 99 mm. For example, when a half-battery cell is obtained by cutting a whole battery cell with a length of 192 mm, the length of the battery cell 1012 may be 96 mm.

[0141] Specifically, a cell that is too long is not conducive to process manufacturing, and a cell that is too short will result in a lower cell power. Therefore, the cell design of the present application can take into account both reducing process difficulty and ensuring component power, and facilitates flexible layout of cells in photovoltaic modules to obtain target power and voltage.

[0142] Optionally, based on the above-mentioned embodiment, in one implementation manner, the length of the battery cell 1012 is 105±3 mm. The length of the battery cell 1012 may be 102 mm, 103 mm, 104 mm, 105 mm, 106 mm, 107 mm, or 108 mm. For example, when a half-battery cell is obtained by cutting a whole battery cell with a length of 210 mm, the length of the battery cell 1012 may be 105 mm.

[0143] Specifically, the battery cell size of the present application is relatively large, which greatly increases the power of the component.

[0144] Optionally, based on the above-mentioned embodiment, in one implementation, the width of the battery cell 1012 is 182.2±5 mm. The width of the battery cell 1012 may be 177.2 mm, 178.2 mm, 179.2 mm, 180.2 mm, 182.2 mm, 185.2 mm, or 187.2 mm. For example, when a full battery cell with a width of 182.2 mm is cut to obtain a half battery cell, the width of the battery cell 1012 remains unchanged at 182.2 mm.

[0145] Therefore, the above-mentioned solar cells 1012 of different specifications and sizes can provide more options for the manufacturing process of the photovoltaic module of the embodiment of the present application, and a rich variety of products can be prepared.

[0146] Optionally, based on the above embodiment, in one implementation manner, the number of busbars provided on each battery cell 1012 is greater than 16 and less than 20. The number of busbars may be 16, 17, 18, 19, or 20.

[0147] Specifically, the more main grids there are, the better the current collection performance is, but this will lead to increased costs.

[0148] Based on the above, the number of main grids in the embodiment of the present application can take into account both current collection performance and cost reduction. For example, the number of main grids can be 18.

[0149] Optionally, based on the above embodiment, in one implementation, a plurality of busbars are provided on each cell 1012, and the number of pads provided on each busbar is greater than 6 and less than 9. The number of pads on the busbar may be 6, 7, 8, or 9.

[0150] Specifically, more pads on a single busbar make welding more reliable but will lead to increased costs.

[0151] Based on the above, the number of pads on the main grid of the present application can take into account both welding reliability and cost reduction.

[0152] Optionally, based on the above embodiment, in one implementation, the number of positive electrode fine grids provided on each battery cell 1012 is greater than 98 and less than 103. For example, the number of positive electrode fine grids may be 98, 99, 100, 101, 102 or 103.

[0153] Optionally, based on the above embodiment, in one implementation, the number of negative electrode fine grids provided on each battery cell 1012 is greater than 99 and less than 104. For example, the number of negative electrode fine grids may be 99, 100, 101, 102, 103, or 104.

[0154] Specifically, the more fine grids there are, the better the current collection performance is, but the higher the cost is. And when the cell area is fixed, the more fine grids there are, the closer the distance between the opposite-sex fine grids is, and the more likely it is that a short circuit risk will occur.

[0155] Based on the above, the number of fine grids in the present application can take into account the current collection performance, the safe distance of the heterogeneous fine grids, and the reduction of costs.

[0156] Optionally, based on the above embodiment, in one implementation, a plurality of fine grids are provided on each of the battery cells 1012, and the distance between two adjacent fine grids with the same polarity is greater than 0.92 mm and less than 0.96 mm. For example, the distance may be 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, or 0.96 mm.

[0157] Specifically, for back-contact cells, since there is a thin grid of opposite polarity between two thin grids of the same polarity, the smaller the distance between two adjacent thin grids of the same polarity, the smaller the distance between the thin grids of opposite polarity, and the easier it is for them to contact and short-circuit. The larger the distance between two adjacent thin grids of the same polarity, the more unfavorable it is to fully utilize the component space.

[0158] Based on the above, the embodiments of the present application can take into account both circuit stability and component space utilization.

[0159] Optionally, refer to Fig. 9 , the plurality of battery cells 1012 form a plurality of battery strings 101;

[0160] The string spacing δ1 between two adjacent battery strings 101 is greater than 0.8 mm and less than 2 mm. The string spacing δ1 may be 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm.

[0161] When the string spacing δ1 is large, it is easy to cause a waste of component area, and when the string spacing δ1 is small, it is easy to cause the battery strings on the component to be connected in parallel, which is easy to cause circuit failure.

[0162] Based on this, the string spacing of the present application is 0.8mm≤δ1≤2mm, which can not only reduce the risk of battery string and parallel connection, but also make full use of the component space.

[0163] Optionally, refer to Fig.10 , the inter-cell spacing δ2 between two adjacent battery cells 1012 in the same battery string 101 is greater than 0.5 mm and less than 2 mm. The inter-cell spacing δ2 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm.

[0164] When the cell spacing δ2 is large, it is easy to cause a waste of component area, and when the cell spacing δ2 is small, it is easy to cause parallel cells inside the battery string on the component, which is easy to cause circuit failure.

[0165] Based on this, the cell spacing in this application is 0.5mm≤δ2≤2mm, which can not only reduce the risk of cell paralleling, but also make full use of the component space.

[0166] Optionally, refer to Fig. 9 and Fig.10The string spacing δ1 between two adjacent battery strings 101 is greater than the cell spacing δ2 between two adjacent battery cells 1012 in the same battery string 101 .

[0167] Specifically, compared to battery cells, battery strings are longer and will bend to a certain extent after being welded with welding ribbons, so the risk of string connection is higher. Therefore, a reasonable design is that the string spacing between battery strings should be larger than the cell spacing between battery cells.

[0168] Based on the above, the string spacing δ1 of the battery string 101 is greater than the cell spacing δ2 between two adjacent battery cells 1012 in the same battery string 101 , and the photovoltaic module has a higher module space utilization rate and is safer and more reliable.

[0169] The embodiments of the present application also provide a photovoltaic system, which may use multiple photovoltaic modules as described in the aforementioned embodiments. Multiple photovoltaic modules may be installed on the roof of a building to form a distributed photovoltaic power generation system.

[0170] Specifically, the photovoltaic modules can be fixed to the building by using adhesive with strong adhesion and excellent weather resistance, or by using connectors such as a pressing block assembly used in conjunction with the photovoltaic module frame, or by using a hanger fastener used in conjunction with the photovoltaic module frame to mount the photovoltaic module on the wall of the building. The appropriate installation structure can be selected according to the actual construction conditions.

[0171] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0172] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A photovoltaic module, characterized in that: The photovoltaic assembly includes a battery module; The battery module includes a plurality of battery string groups, wherein the battery string groups include battery strings arranged at intervals along a first direction of the photovoltaic module, wherein the battery string includes an interconnection bar and a plurality of battery sheets, wherein the interconnection bar connects the plurality of battery sheets in series by welding and extends from an end of the battery string; The battery cell comprises: a substrate, the substrate having a first side and a second side perpendicular to each other; a plurality of collector electrodes, the extension direction of the collector electrodes is perpendicular to the first side, the plurality of collector electrodes include a first collector electrode and a second collector electrode, the first collector electrode and the second collector electrode have different polarities, and the first collector electrode and the second collector electrode are both located on the back side of the substrate; The battery string group includes a first battery string group and a second battery string group, the first battery string group and the second battery string group are arranged at intervals along the second direction of the photovoltaic module, an intermediate bus bar is arranged between the first battery string group and the second battery string group, the intermediate bus bar is electrically connected to the interconnection bar extending from the end of the battery string, and the intermediate bus bar has a bending portion; Adjacent interconnecting bars on the same battery cell are respectively connected to collector electrodes of different polarities and the distance between adjacent interconnecting bars is L, and the distance between an interconnecting bar adjacent to the bending portion and the bending portion is D1, wherein D1 is the shortest distance along the length direction of the intermediate bus bar; The photovoltaic module satisfies: 3mm<D1<13mm; or, L<D1<2L.

2. The photovoltaic module according to claim 1, characterized in that: The extending direction of the portion where the interconnection bar overlaps the middle bus bar is perpendicular to the length direction of the middle bus bar.

3. The photovoltaic module according to claim 1, characterized in that: The extending direction of the portion where the interconnection bar overlaps the middle bus bar is obliquely intersected with the length direction of the middle bus bar.

4. The photovoltaic module according to claim 1, characterized in that: The interconnection bar comprises a first interconnection bar connected to a first collector electrode and a second interconnection bar connected to a second collector electrode; The first interconnection bars and the second interconnection bars are alternately arranged along the length direction of the middle bus bar; the first interconnection bars extend from the ends of the battery string and are welded to the middle bus bar, and the second interconnection bars are disconnected from the middle bus bar.

5. The photovoltaic module according to claim 4, characterized in that: In two adjacent battery strings, a second interconnection bar is distributed between two first interconnection bars close to the bending portion.

6. The photovoltaic module according to claim 5, characterized in that: Along the middle bus bar In the length direction, the distance between two first interconnecting bars in two adjacent battery strings and close to the bending portion is S; the distance between the bending portions of two adjacent intermediate bus bars is D2; The ratio of D2 to S satisfies 0.108<D2 / S<0.646; or, 2mm<D2<12mm.

7. The photovoltaic module according to claim 4, characterized in that: Two second interconnection bars are distributed between two first interconnection bars near the bending portion in two adjacent battery strings.

8. The photovoltaic module according to claim 7, characterized in that: Along the length direction of the middle bus bar, the distance between two first interconnecting bars in two adjacent battery strings and close to the bending portion is S; the distance between the bending portions of two adjacent middle bus bars is D2; The ratio of D2 to S satisfies 0.069<D2 / S<0.415; or, 2mm<D2<12mm.

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The width of the intermediate bus bar is L1, 3mm<L1<8mm; and / or, The width of the gap area between the first battery string group and the second battery string group is L2, 7mm<L2<16mm.

10. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The photovoltaic module also includes a back plate, and the back plate is provided with a wire outlet hole; The outlet hole is located in the gap area between the first battery string group and the second battery string group, and the outlet hole is located between two adjacent middle bus bars; Two adjacent intermediate bus bars are bent and extend out from the same outlet hole.

11. The photovoltaic module according to claim 10, characterized in that: The back plate is provided with three outlet holes, and the three outlet holes are arranged along the length direction of the middle bus bar; Among the three outlet holes, the shape of the outlet hole in the middle is different from the shape of the outlet holes on both sides; and / or, The outlet hole located in the middle of the three outlet holes has a long axis and a short axis that are perpendicular to each other, the long axis is parallel to the length direction of the middle bus bar, and the short axis is parallel to the width direction of the middle bus bar; and / or, The cross-sectional shape of the outlet hole located in the middle of the three outlet holes includes a first arc, a second arc, a third arc and a fourth arc, the first arc and the second arc are symmetrical with respect to the minor axis and are cocircular, and the third arc and the fourth arc are symmetrical with respect to the major axis and are coelliptical; and / or, The battery sheet has a chamfered structure at a position close to the wire outlet hole.

12. The photovoltaic module according to claim 10, characterized in that: The photovoltaic assembly further includes a junction box, which is fixed at the location of the outlet hole, and the intermediate bus bar is electrically connected to the junction box; The overlap area between the junction box and any of the four solar cells around the outlet hole does not exceed 300mm 2 .

13. The photovoltaic module according to claim 12, characterized in that: Along the length direction of the intermediate bus bar, the distance between the edge of the junction box and the edge of the outlet hole is not less than 23.5 mm; and / or, Along the width direction of the middle bus bar, the distance between the edge of the junction box and the edge of the outlet hole is not less than 6.5 mm.

14. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The battery cell includes an 0BB battery cell or an MBB battery cell.

15. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The length of the photovoltaic module is greater than 1797 mm and less than 1805 mm; or, The length of the photovoltaic module is greater than 1957 mm and less than 1967 mm; or, The length of the photovoltaic module is greater than 1989 mm and less than 1996 mm.

16. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The length of the battery cell is 96±3 mm; or The length of the battery cell is 105±3 mm; or The width of the battery cell is 182.2±5 mm.

17. The photovoltaic module according to any one of claims 1 to 8, characterized in that: The number of main grids provided on each of the solar cells is greater than 16 and less than 20; and / or, Each of the solar cells is provided with a plurality of main grids, and the number of the welding pads provided on each main grid is greater than 6 and less than 9; and / or, The number of positive electrode fine grids provided on each of the battery cells is greater than 98 and less than 103; and / or, The number of negative electrode fine grids provided on each of the battery cells is greater than 99 and less than 104; and / or, A plurality of fine grids are arranged on each of the battery cells, and the distance between two adjacent fine grids with the same polarity is greater than 0.92 mm and less than 0.96 mm.

18. The photovoltaic module according to any one of claims 1 to 8, characterized in that: A plurality of battery cells are formed into a plurality of battery strings; The string spacing between two adjacent battery strings is greater than 0.8 mm and less than 2 mm; and / or, The spacing between two adjacent battery cells in the same battery string is greater than 0.5 mm and less than 2 mm; and / or, The string spacing between two adjacent battery strings is greater than the cell spacing between two adjacent battery cells in the same battery string.

19. A photovoltaic system, characterized in that: A plurality of photovoltaic modules according to any one of claims 1 to 18 arranged in an array.

20. The photovoltaic system according to claim 19, characterized in that: The photovoltaic module is glued to the building; or, The photovoltaic module is fixed to the building via a connector; or, The photovoltaic components are mounted on the building.

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