Conductive backboard and photovoltaic module

Abstract

The invention discloses a conductive backboard and a photovoltaic module, and belongs to the technical field of photovoltaic modules. The conductive backboard comprises a conductive layer, the conductive layer is provided with insulation gaps, the insulation gaps are used for dividing the conductive layer into a plurality of conductive sheets, each conductive sheet is provided with a base part and a first finger-shaped part extending from the base part to a first direction and / or a second finger-shaped part extending from the base part to a second direction, and the first direction is opposite to the second direction; the conducting strips comprise a first conducting strip, a second conducting strip and a third conducting strip which are arranged at intervals in the first direction; the insulating layer is stacked on the conducting layer, a through hole is formed in the insulating layer, and the through hole penetrates through the insulating layer to expose the conducting layer; in the first direction, the shortest distance between the through hole corresponding to the first finger-shaped part of the first conducting strip and the through hole corresponding to the second finger-shaped part of the third conducting strip is S1, the shortest distance of the base part of the second conducting strip is S2, and the condition that S2 / S1 is larger than or equal to 0.05 and smaller than or equal to 0.85 is met.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic modules, and in particular to a conductive backplane and a photovoltaic module. Background Art

[0002] The photovoltaic module includes a solar cell and a back plate, wherein the back plate is connected to the back of the solar cell to support the solar cell through the back plate.

[0003] In the related art, one end of the soldering ribbon is usually connected to the back of a battery cell, and the other end of the soldering ribbon is connected to the back of another adjacent battery cell, so that the battery cells are connected in series through the soldering ribbon to form a battery string. Then, the back plate is connected to the back of the battery string to support and fix the battery string through the back plate.

[0004] However, the existing method of connecting adjacent cells in series through welding ribbons is prone to problems such as hidden cracks and bending in the photovoltaic module lamination process, which affects the reliability of the photovoltaic module. Summary of the invention

[0005] The present application discloses a conductive backplane and a photovoltaic module, so as to solve or at least partially solve the problems existing in the prior art in that the solar cells are prone to hidden cracks and bending during the preparation of photovoltaic modules.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, the present application discloses a conductive backplane, which includes a conductive layer, on which an insulating gap is provided, and the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, the conductive sheet having a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the first direction being opposite to the second direction; the conductive sheet includes a first conductive sheet, a second conductive sheet and a third conductive sheet arranged at intervals along the first direction; an insulating layer, the insulating layer is stacked on the conductive layer, a through hole is provided on the insulating layer, and the through hole penetrates the insulating layer to expose the conductive layer; along the first direction, the shortest distance between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the through hole corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S2 / S1≤0.85.

[0008] Optionally, the first finger-shaped portion and the second finger-shaped portion have a head portion away from the base and a tail portion close to the base, and the shortest distance between the through hole corresponding to the first finger-shaped portion and the second finger-shaped portion and the end of the head portion is S3; satisfying 0.3mm<S3<1mm.

[0009] Optionally, S2>0.8mm is satisfied.

[0010] Optionally, the conductive backplane further includes a busbar, which is disposed between the conductive layer and the insulating layer and opposite to the base; the width of the base opposite to the busbar is S4, satisfying 3mm≤S4≤12mm.

[0011] Optionally, the width of the insulating gap is L, satisfying L≥0.3 mm.

[0012] Optionally, 0.6 mm ≤ L ≤ 1.5 mm is satisfied.

[0013] Optionally, along the first direction, the first finger-shaped portion and the second finger-shaped portion are arranged opposite to each other; or, along the first direction, the first finger-shaped portion and the second finger-shaped portion are arranged staggered.

[0014] Optionally, the through hole is a strip structure, and the through hole extends along the first direction.

[0015] Optionally, the through holes include a plurality of groups, and each group of the through holes is arranged corresponding to one of the first finger-shaped portions or one of the second finger-shaped portions; each group of the through holes includes a plurality of through holes, and the plurality of through holes are arranged at intervals along the first direction.

[0016] Optionally, along the direction extending from the tail portion to the head portion, the distance between two adjacent through holes decreases.

[0017] Optionally, the shortest distance between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the base of the second conductive sheet is greater than the shortest distance between the through hole corresponding to the second finger-shaped portion of the second conductive sheet and the base of the second conductive sheet; and / or the shortest distance between the through hole corresponding to the second finger-shaped portion of the third conductive sheet and the base of the second conductive sheet is greater than the shortest distance between the through hole corresponding to the first finger-shaped portion of the second conductive sheet and the base of the second conductive sheet.

[0018] Optionally, along the first direction, the shortest distance between the through hole corresponding to the first finger-shaped portion of the second conductive sheet and the through hole corresponding to the second finger-shaped portion of the second conductive sheet is S5, and S5 is satisfied. ＜ S1.

[0019] Optionally, the conductive backplane further includes a busbar, which is stacked between the insulating layer and the conductive layer and arranged opposite to the base; along the first direction, the width of the busbar is K, satisfying K≤S2; and / or 0.1≤K / S2≤0.96.

[0020] In a second aspect, the present application discloses a photovoltaic module, which includes a battery cell, on which an electrical connection portion is provided; a conductive backplane, which is connected to the back of the battery cell, the conductive backplane includes a conductive layer, on which an insulating gap is provided, and the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, the conductive sheet having a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the first direction being opposite to the second direction; the conductive sheet includes a first conductive sheet, a second conductive sheet and a third conductive sheet arranged at intervals along the first direction, and an electrical connection point is provided on the conductive sheet; a conductive bonding portion, which is electrically connected between the electrical connection point and the electrical connection portion; along the first direction, the shortest distance between the electrical connection point corresponding to the first finger-shaped portion of the first conductive sheet and the electrical connection point corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S2 / S1≤0.85.

[0021] Optionally, the first finger-shaped portion and the second finger-shaped portion have a head portion away from the base portion and a tail portion close to the base portion; and the widths of the first finger-shaped portion and the second finger-shaped portion gradually decrease along a direction extending from the tail portion to the head portion.

[0022] Optionally, the width of the tail is greater than twice the width of the head.

[0023] Optionally, the shortest distance between the electrical connection point corresponding to the first finger-shaped portion and the second finger-shaped portion and the end of the head is S3, satisfying 0.3 mm<S3<1 mm.

[0024] Optionally, S2>0.8mm is satisfied.

[0025] Optionally, the photovoltaic module further includes a busbar, which is stacked on the conductive layer and the base is arranged opposite to the busbar; the width of the base arranged opposite to the busbar is S4, satisfying 3mm≤S4≤12mm.

[0026] Optionally, the width of the insulating gap is L, satisfying L≥0.3 mm.

[0027] Optionally, along the third direction, the shortest distance between the electrical connection portion and the edge of the battery cell is D1, satisfying D1<3 mm; and the third direction is perpendicular to the first direction and the second direction.

[0028] Optionally, along the first direction, the shortest distance between the electrical connection portion and the edge of the battery cell is D2, satisfying D2<2mm.

[0029] Optionally, along the first direction, the battery cell has a first side and a second side that are opposite to each other, and along the third direction, the battery cell has a third side and a fourth side that are opposite to each other, a first chamfer is provided between the third side and the first side, a second chamfer is provided between the fourth side and the first side, and the third direction is perpendicular to the first direction and the second direction; a projection of the electrical connection portion closest to the first chamfer on the battery cell falls within the battery cell, and a projection of the electrical connection portion closest to the second chamfer on the battery cell falls within the battery cell.

[0030] Optionally, the conductive backplane further includes a busbar, which is superimposed on the conductive layer and arranged opposite to the base; along the first direction, the width of the busbar is K, satisfying K≤S2; and / or 0.1≤K / S2≤0.96.

[0031] Optionally, along the first direction, the distance between the head of the first finger-shaped portion of the first conductive sheet and the busbar corresponding to the base of the second conductive sheet is greater than 0.3 mm; and / or, along the first direction, the distance between the head of the second finger-shaped portion of the third conductive sheet and the busbar corresponding to the base of the second conductive sheet is greater than 0.3 mm.

[0032] Optionally, along the first direction, a width of the base portion corresponding to the busbar is greater than a width of other portions of the base portion.

[0033] Optionally, the battery cells include a plurality of battery cells, which are connected in series to form a battery string; along the extension direction of the battery string, the spacing between two adjacent battery cells located in the middle position is greater than or equal to the spacing between two adjacent battery cells in the battery string, and the busbar is arranged between two adjacent battery cells located in the middle position.

[0034] Optionally, along a third direction, the shortest distance between the electrical connection portion corresponding to the battery cell closest to the bus bar and the edge of the battery cell is greater than the shortest distance between the electrical connection portion corresponding to the battery cell relatively far from the bus bar and the edge of the battery cell; the third direction is perpendicular to the first direction and the second direction.

[0035] Optionally, the conductive backplane also includes an insulating layer, which is arranged between the conductive layer and the battery cell; a through hole is opened on the insulating layer, and the through hole passes through the insulating layer to leak out the conductive layer; the conductive bonding part is passed through the through hole and is electrically connected between the electrical connection point and the electrical connection part.

[0036] Optionally, the through hole is a strip structure, and the through hole extends along the first direction.

[0037] Optionally, the through holes include multiple groups, each group of through holes is arranged corresponding to one of the first finger-shaped portions or one of the second finger-shaped portions, each group of through holes includes multiple through holes, and the multiple through holes are arranged at intervals along the first direction; the conductive bonding portions also include multiple conductive bonding portions, each of which is arranged corresponding to one through hole.

[0038] Optionally, the through hole has a first projection on the plane where the battery cell is located, and the conductive bonding portion has a second projection on the plane where the battery cell is located, and the second projection falls within the first projection.

[0039] In a third aspect, the present application further discloses a photovoltaic module, which includes a battery cell; a conductive backplane, the conductive backplane is connected to the back of the battery cell, the conductive backplane includes a conductive layer, the conductive layer is provided with an insulating gap, the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, the conductive sheet has a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the first direction is opposite to the second direction; the conductive sheet includes a first conductive sheet, a second conductive sheet and a third conductive sheet arranged at intervals along the first direction; an electrical connecting portion, the electrical connecting portion is provided on the battery cell, the electrical connecting portion is used to be electrically connected to the conductive sheet; along the first direction, the shortest distance between the electrical connecting portion corresponding to the first finger-shaped portion of the first conductive sheet and the electrical connecting portion corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S1 / S2≤0.85.

[0040] The present application discloses a conductive backplane and a photovoltaic module, the conductive backplane comprises a conductive layer, an insulating gap is arranged on the conductive layer, the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, the conductive sheet comprises a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the first direction is opposite to the second direction; the conductive sheet comprises a first conductive sheet, a second conductive sheet and a third conductive sheet arranged at intervals along the first direction; an insulating layer, the insulating layer is stacked on the conductive layer, a through hole is opened on the insulating layer, the through hole penetrates the insulating layer to expose the conductive layer; along the first direction, the shortest distance between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the through hole corresponding to the second finger-shaped portion of the third conductive sheet is S1, the shortest distance of the base of the second conductive sheet is S2, and 0.05≤S2 / S1≤0.85 is satisfied.

[0041] The present application discloses a conductive backplane, which includes a conductive layer, an insulating gap is provided on the conductive layer, and the conductive layer is divided into a plurality of conductive sheets by the insulating gap, the conductive sheet has a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the conductive sheet includes a first conductive sheet, a second conductive sheet and a third conductive sheet, the insulating layer is stacked on the conductive layer, and a through hole is provided on the insulating layer, and the through hole penetrates the insulating layer to expose the conductive layer. The conductive sheet is electrically connected to the battery cell through the through hole to collect the current generated by the battery cell. In addition, the adjacent battery cells can be connected in series through the conductive sheet to avoid defects such as hidden cracks and bending of the battery cells during the lamination process of the photovoltaic module, so as to improve the process yield and reliability of the photovoltaic module.

[0042] Furthermore, along the first direction, the shortest distance between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the through hole corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S2 / S1≤0.85. Through the above arrangement, the current collection efficiency of the photovoltaic module is improved, and the photoelectric conversion efficiency of the photovoltaic module is ensured.

[0043] If the shortest distance S1 between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the through hole corresponding to the second finger-shaped portion of the third conductive sheet is too large along the first direction, the current collection at the edge of the cell will be poor, affecting the photoelectric conversion efficiency of the photovoltaic module. If the shortest distance S1 between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the through hole corresponding to the second finger-shaped portion of the third conductive sheet is too small, the base design space of the second conductive sheet will be small, and the conductive base distance will be too small. Since the base of the second conductive sheet is overlapped with a busbar, the cell is easily connected to the busbar, causing a short circuit in the photovoltaic module, affecting the photoelectric conversion efficiency of the photovoltaic module.

[0044] If the shortest distance S2 of the base of the second conductive sheet is too small, the bus resistance will be too large, affecting the photoelectric conversion efficiency of the photovoltaic module. At the same time, if the distance S2 is too small, the removal of waste wire after the insulating gap is formed will easily cause the base 121 to break, affecting the connection reliability. Furthermore, if the shortest distance S2 of the base of the second conductive sheet is too small, since the base of the second conductive sheet is overlapped with a bus strip, the width of the bus strip will also be small, affecting the current transmission efficiency and the photoelectric conversion efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 1 ;

[0046] Figure 2 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 2 ;

[0047] Figure 3 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 3 ;

[0048] Figure 4 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 4 ;

[0049] Figure 5 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 5 ;

[0050] Figure 6 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 6 ;

[0051] Figure 7 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 7 ;

[0052] Figure 8 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 8 ;

[0053] Fig. 9 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 9 ;

[0054] Fig.10 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 ;

[0055] Fig.11 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 one;

[0056] Fig.12 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 two;

[0057] Fig.13 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 three;

[0058] Fig.14 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 Four;

[0059] Fig.15 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 five;

[0060] Fig.16 The structure of the conductive backplane in the embodiment of the present application is shown in FIG. Figure 10 six;

[0061] Fig.17 A cross-sectional view showing the conductive back plate described in the embodiment of the present application;

[0062] Fig.18 The structure of the photovoltaic module described in the embodiment of the present application is shown in FIG. Figure 1 ;

[0063] Reference numerals:

[0064] 10: conductive layer; 11: insulating gap; 12: conductive sheet; 121: base; 122: first finger-shaped portion; 123: second finger-shaped portion; 124: head; 125: tail; 13: first conductive sheet; 14: second conductive sheet; 15: third conductive sheet;

[0065] 20: insulation layer; 21: through hole;

[0066] 30: Converging belt;

[0067] 40: battery cell; 41: first side edge; 42: second side edge; 43: third side edge; 44: fourth side edge; 45: first chamfer; 46: second chamfer;

[0068] 50: electrical connection portion;

[0069] 60: conductive joint;

[0070] 70: back plate; 71: adhesive film layer;

[0071] X: first direction; Y: second direction; Z: third direction. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0073] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0074] like Figures 1 to 17 As shown, an embodiment of the present application discloses a conductive backplane, which includes an insulating layer 20, a conductive layer 10 and a backplane 70 stacked in sequence, and a backplane adhesive film layer 71 is provided on the side of the backplane 70 facing the conductive layer 10, and the backplane adhesive film layer 71 can be made of a combination of one or two materials selected from ethylene-octene copolymer (POE) and ethylene-vinyl acetate copolymer (EVA). By providing the backplane adhesive film layer 71, the connection and fixation between the conductive layer 10 and the backplane 70 can be achieved, and the conductive layer 10 can also be packaged and protected. The backplane 70 can be made of inorganic glass, organic glass, organic polymer materials, etc., and can be flexibly arranged according to actual needs, which is not limited here.

[0075] Further, refer to Figures 1 to 17 As shown, an insulating gap 11 is provided on the conductive layer 10, and the insulating gap 11 is used to separate the conductive layer 10 into a plurality of conductive sheets 12, and the conductive sheet 12 has a base 121 and a first finger-shaped portion 122 extending from the base 121 toward a first direction X and / or a second finger-shaped portion 123 extending from the base 121 toward a second direction Y, and the first direction X is opposite to the second direction Y; the conductive sheet 12 includes a first conductive sheet 13, a second conductive sheet 14 and a third conductive sheet 15 arranged at intervals along the first direction X. 5; an insulating layer 20, the insulating layer 20 is stacked on the conductive layer 10, a through hole 21 is opened on the insulating layer 20, and the through hole 21 penetrates the insulating layer 20 to expose the conductive layer 10; along the first direction X, the shortest distance between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is S1, and the shortest distance of the base 121 of the second conductive sheet 14 is S2, satisfying 0.05≤S2 / S1≤0.85.

[0076] The embodiment of the present application discloses a conductive backplane, which is used in a photovoltaic module to support and protect the cell 40 of the photovoltaic module. The conductive layer 10 in the conductive backplane can realize the conductive interconnection between multiple cells 40, which saves the process of laying and welding welding strips compared to traditional photovoltaic modules, can improve the production efficiency of photovoltaic modules, and integrates a busbar 30 in the conductive backplane to use the busbar 30 to collect current and conduct it out of the photovoltaic module.

[0077] like Figures 1 to 17 As shown, the conductive backplane disclosed in the embodiment of the present application includes a conductive layer 10, on which an insulating gap 11 is provided. The conductive layer 10 is divided into a plurality of conductive sheets 12 by the insulating gap 11, and the plurality of conductive sheets 12 are arranged at intervals along a first direction X. Figures 1 to 17As shown in FIG. 1 , the conductive sheet 12 includes a first conductive sheet 13, a second conductive sheet 14, and a third conductive sheet 15 arranged at intervals along a first direction X. An insulating gap 11 is provided between two adjacent conductive sheets 12 to isolate the two adjacent conductive sheets 12 through the insulating gap 11 to prevent the two adjacent conductive sheets 12 from being electrically connected, thereby preventing a short circuit in the photovoltaic module. The insulating gap 11 can be processed by laser, stamping, milling cutter, etc. to remove part of the structure of the conductive layer 10 to form a hollow structure in the conductive layer 10.

[0078] Each conductive sheet 12 includes a base 121 and a first finger 122 extending from the base 121 toward a first direction X and / or a second finger 123 extending from the base 121 toward a second direction Y, and the second direction Y is opposite to the first direction X. Exemplarily, the first conductive sheet 13 includes a base 121 and a first finger 122 extending from the base 121 toward the first direction X. The second conductive sheet 14 includes a base 121 and a first finger 122 extending from the base 121 toward the first direction X, and a second finger 123 extending from the base 121 toward the second direction Y. The third conductive sheet 15 includes a base 121 and a second finger 123 extending from the base 121 toward the second direction Y.

[0079] It should be noted that the conductive layer 10 in the embodiment of the present application has conductivity, and the conductive layer 10 can be a metal layer. For example, the conductive layer 10 can be made of one or more combinations of copper, aluminum, copper-aluminum alloy, and aluminum-nickel alloy. In the embodiment of the present application, there are no excessive restrictions on the specific material of the conductive layer 10, and in actual applications, technicians can choose according to needs.

[0080] like Figures 1 to 17 As shown, the conductive backplane disclosed in the embodiment of the present application also includes an insulating layer 20, which is stacked on the conductive layer 10, and the insulating layer 20 is located between the conductive layer 10 and the battery cell 40, so as to isolate the conductive layer 10 and the battery cell 40 through the insulating layer 20 to avoid short circuit in the photovoltaic module.

[0081] Among them, a through hole 21 is opened on the insulating layer 20, and the through hole 21 penetrates the insulating layer 20 to expose the conductive layer 10 and the electrical connection part at the corresponding position of the battery cell 40. A conductive joint 60 is arranged in the through hole 21, and one end of the conductive joint 60 is electrically connected to the battery cell 40, and the other end is electrically connected to the conductive layer 10. Specifically, one end of the conductive joint overlaps the electrical connection part on the battery cell 40, and the other end overlaps the electrical connection point on the conductive layer 10. Such a configuration enables the battery cells 40 to be connected in series or in parallel with each other through the conductive layer 10. The electrical connection part can be an electrode on the battery cell 40 or a part conductively connected to the electrode. The electrodes of the battery cell include a main grid, a secondary grid, a pad, and a thickened section on the secondary grid.

[0082] The conductive joint 60 is made of a conductive material, for example, a conductive paste such as solder paste or conductive glue, and is formed on the cell 40 or the conductive layer 10 by heating or infrared curing. During the lamination of the photovoltaic module, the conductive joint 60 is melted by heat, and then overlaps with the electrode on the cell 40 or the conductive layer 10 through the through hole 21 on the insulating layer 20 to achieve electrical connection. The material of the conductive joint 60 can be selected from an alloy containing tin and bismuth, for example, a tin-bismuth alloy, a tin-lead-bismuth alloy, a tin-bismuth-copper alloy, a tin-bismuth-silver alloy, and the like.

[0083] Furthermore, the conductive sheet 12 can be connected in series with adjacent cells 40 to avoid defects such as cracks and bending of the cells 40 during the lamination process of the photovoltaic module, thereby improving the process yield and reliability of the photovoltaic module.

[0084] It should be noted that the insulating layer 20 in the embodiment of the present application has insulating properties. For example, the insulating layer 20 can be an EVA film, which is a film made of ethylene-vinyl acetate copolymer. Of course, in the embodiment of the present application, there are no excessive restrictions on the specific material of the insulating layer 20. In actual applications, technicians can choose according to needs.

[0085] In the embodiment of the present application, along the first direction X, the shortest distance between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is S1, and the shortest distance between the base 121 of the second conductive sheet 14 is S2, satisfying 0.05≤S2 / S1≤0.85. Through the above arrangement, the current collection efficiency of the photovoltaic module is improved, and the photoelectric conversion efficiency of the photovoltaic module is ensured.

[0086] Illustratively, the ratio of S2 to S1 may be 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, etc.

[0087] It should be noted that if Figure 1 As shown, when the first finger 122 and the second finger 123 are arranged oppositely along the first direction X, the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 are also arranged oppositely along the first direction X. S1 refers to the shortest distance between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15, which are arranged oppositely along the first direction X.

[0088] like Fig.15 As shown, when the first finger-shaped portion 122 and the second finger-shaped portion 123 are staggered along the first direction X, the through hole 21 corresponding to the first finger-shaped portion 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger-shaped portion 123 of the third conductive sheet 15 are also staggered along the first direction X. S1 refers to the shortest distance between the extension line of the through hole 21 corresponding to the first finger-shaped portion 122 of the first conductive sheet 13 along the third direction Z and the through hole 21 corresponding to the second finger-shaped portion 123 of the third conductive sheet 15 along the first direction X.

[0089] If the shortest distance S1 between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is too large along the first direction X, the current collection at the edge of the cell 40 will be poor, affecting the photoelectric conversion efficiency of the photovoltaic module. If the shortest distance S1 between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is too small, the design space of the base 121 of the second conductive sheet 14 will be small, resulting in too small distance of the base 121. Since the base 121 of the second conductive sheet 14 is overlapped with the busbar 30, the cell 40 is easily connected to the busbar 30, causing a short circuit in the photovoltaic module, affecting the photoelectric conversion efficiency of the photovoltaic module.

[0090] If the shortest distance S2 of the base 121 of the second conductive sheet 14 is too small, the bus resistance will be too large, affecting the photoelectric conversion efficiency of the photovoltaic module. At the same time, if the distance S2 is too small, the removal of waste wire after the insulating gap is formed will easily cause the base 121 to break, affecting the connection reliability. Furthermore, if the shortest distance S2 of the base 121 of the second conductive sheet 14 is too small, since the base 121 of the second conductive sheet 14 is overlapped with the bus strip 30, the width of the bus strip 30 will also be small, affecting the current transmission efficiency and the photoelectric conversion efficiency of the photovoltaic module.

[0091] Alternatively, if Figure 1 As shown, the first finger-shaped portion 122 and the second finger-shaped portion 123 in the embodiment of the present application have a head portion 124 away from the base 121 and a tail portion 125 close to the base 121, and the shortest distance between the through hole 21 corresponding to the first finger-shaped portion 122 and the second finger-shaped portion 123 and the end of the head portion 124 is S3; 0.3mm<S3<1mm is satisfied.

[0092] like Figure 1As shown, the first finger-shaped portion 122 or the second finger-shaped portion 123 has a tail portion 125 close to the base portion 121 and a head portion 124 far from the base portion 121. In the through hole 21 corresponding to the first finger-shaped portion 122, the shortest distance between the end of the head portion 124 of the first finger-shaped portion 122 is S3, and in the through hole 21 corresponding to the second finger-shaped portion 123, the shortest distance between the end of the head portion 124 of the second finger-shaped portion 123 is also S3. Among them, S3 is greater than 0.3 mm and less than 1 mm.

[0093] In the embodiment of the present application, the shortest distance S3 between the through hole 21 corresponding to the first finger-shaped portion 122 or the second finger-shaped portion 123 and the end of the corresponding head 124 is set to be greater than 0.3 mm and less than 1 mm, so as to improve the current collection efficiency, avoid short circuit in the photovoltaic module, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0094] If the shortest distance S3 between the through hole 21 corresponding to the first finger 122 or the second finger 123 and the end of the corresponding head 124 is too large, the current collection efficiency at the edge of the cell 40 will be low, affecting the photoelectric conversion efficiency of the photovoltaic module. If the shortest distance S3 between the through hole 21 corresponding to the first finger 122 or the second finger 123 and the end of the corresponding head 124 is too small, the conductive joint 60 or other components may be easily offset during the packaging of the photovoltaic module, resulting in a short circuit in the photovoltaic module, affecting the photoelectric conversion efficiency of the photovoltaic module.

[0095] Exemplarily, in the embodiment of the present application, the shortest distance S3 between the through hole 21 corresponding to the first finger-shaped portion 122 or the second finger-shaped portion 123 and the end of the corresponding head 124 can be set to 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, etc.

[0096] Alternatively, if Figure 1 As shown, the shortest distance of the base 121 of the second conductive sheet 14 is S2, satisfying S2>0.8 mm.

[0097] like Figure 1 As shown, in the embodiment of the present application, the shortest distance S2 of the base 121 of the second conductive sheet 14 is set to be greater than 0.8 mm. That is, along the first direction X or along the second direction Y, the minimum width of the base 121 of the second conductive sheet 14 is greater than 0.8 mm.

[0098] To prevent the base 121 of the second conductive sheet 14 from being too small, causing the temperature of the second conductive sheet 14 to rise too quickly during current transmission, resulting in the second conductive sheet 14 heating up or even burning out, in this embodiment of the application, the shortest distance S2 of the base 121 of the second conductive sheet 14 is set to be greater than 0.8 mm.

[0099] Exemplarily, the shortest distance S2 of the base 121 of the second conductive sheet 14 may be set to 0.9 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, or the like.

[0100] It should be noted that the thickness of the conductive sheet 12 in the embodiment of the present application is generally greater than or equal to 10 μm and less than or equal to 200 μm. For example, the thickness of the conductive sheet 12 can be 10 μm, 30 μm, 50 μm, 80 μm, 100 μm, 130 μm, 150 μm, 180 μm, 200 μm, etc.

[0101] Alternatively, if Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14 As shown, the conductive backplane disclosed in the embodiment of the present application also includes a busbar 30, which is arranged between the conductive layer 10 and the insulating layer 20 and opposite to the base 121; the width of the base 121 opposite to the busbar 30 is S4, satisfying 3mm≤S4≤12mm.

[0102] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14 As shown, in the embodiment of the present application, a bus bar 30 is arranged between the conductive layer 10 and the insulating layer 20, and the bus bar 30 is arranged opposite to the base 121. The bus bar 30 is electrically connected to the base 121 so as to collect the current collected by the conductive layer 10 through the bus bar 30 and transmit it to the external circuit.

[0103] Since the width of the busbar 30 is linearly related to its power loss, the wider the busbar 30 is, the smaller its power loss is. In order to ensure that the width of the base 121 disposed opposite to the busbar 30 is greater than the width of the busbar 30 and to reserve sufficient space for the arrangement of the busbar 30, in the embodiment of the present application, the width S4 of the base 121 disposed opposite to the busbar 30 is set to be greater than or equal to 3 mm and less than or equal to 12 mm.

[0104] For example, the width S4 of the base portion 121 disposed opposite to the bus ribbon 30 may be set to 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc.

[0105] Alternatively, if Figures 1 to 14 As shown, in the embodiment of the present application, the width of the insulating gap 11 is L, satisfying L≥0.3 mm.

[0106] In the embodiment of the present application, the width L of the insulating gap 11 is set to be greater than or equal to 0.3 mm to ensure that the insulating gap 11 is large enough to avoid short circuit in the photovoltaic module.

[0107] Illustratively, in the embodiment of the present application, the width L of the insulating gap 11 may be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, etc.

[0108] As a preferred implementation manner, in the embodiment of the present application, the width of the insulating gap 11 is L, satisfying 0.6 mm≤L≤1.5 mm.

[0109] For the conductive layer 10, the width of the insulating gap 11 is linearly related to the transmission loss of the conductive layer 10. That is, the wider the width of the insulating gap 11, the narrower the effective conductive width of the conductive layer 10, and the higher the transmission loss of the conductive layer 10. It can be understood that from the perspective of current transmission, the narrower the insulating gap 11, the better. However, if the insulating gap 11 is too narrow, the photovoltaic module is prone to short circuit.

[0110] Therefore, in the embodiment of the present application, the width L of the insulating gap 11 is set to be greater than or equal to 0.6 mm and less than or equal to 1.5 mm to ensure the current transmission efficiency and reduce the current transmission loss. At the same time, short circuit phenomenon of the photovoltaic module is avoided.

[0111] Exemplarily, the width L of the insulating gap 11 may be set to 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.5 mm, etc.

[0112] Optionally, along the first direction X, the first finger-shaped portion 122 and the second finger-shaped portion 123 are arranged opposite to each other; or, along the first direction X, the first finger-shaped portion 122 and the second finger-shaped portion 123 are arranged staggered.

[0113] In the embodiment of the present application, along the first direction X, the first finger portion 122 and the second finger portion 123 of the same conductive sheet 12 can be arranged relative to each other to shorten the current transmission path of the conductive sheet 12, thereby improving the current transmission efficiency of the conductive sheet 12 and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0114] For example, Figures 1 to 14 As shown, the first finger portion 122 and the second finger portion 123 of the second conductive sheet 14 are arranged opposite to each other along the first direction X or the second direction Y.

[0115] In the embodiment of the present application, along the first direction X, the first finger-shaped portion 122 and the second finger-shaped portion 123 of the same conductive sheet 12 can also be staggered. Compared with the first finger-shaped portion 122 and the second finger-shaped portion 123 of the same conductive sheet 12 being relatively arranged along the first direction X, when the width of the base 121 is the same, the reliability of the conductive sheet 12 is higher and the conductive sheet 12 is not easy to break.

[0116] For example, Fig.15 As shown, the first finger-shaped portion 122 and the second finger-shaped portion 123 of the second conductive sheet 14 are staggered along the first direction X or the second direction Y.

[0117] It should be noted that the staggered arrangement in the embodiment of the present application means that the first finger-shaped portion 122 and the second finger-shaped portion 123 are only partially arranged relative to each other along the first direction X or the second direction Y, or the first finger-shaped portion 122 and the second finger-shaped portion 123 are not arranged relative to each other at all along the first direction X or the second direction Y.

[0118] Alternatively, if Figure 7 , Figure 8 , Figures 11 to 14 As shown, the through hole 21 in the embodiment of the present application is a strip-shaped structure, and the through hole 21 extends along the first direction X.

[0119] As an optional implementation, in the embodiment of the present application, the through hole 21 can be set as a strip structure, and the through hole 21 extends along the first direction X. The through hole 21 is set so that the conductive bonding portion 60 can be penetrated into the insulating layer 20 and connected between the conductive layer 10 and the battery cell 40, so as to conduct the conductive layer 10 and the battery cell 40, so as to collect the current generated by the battery cell 40 through the conductive layer 10.

[0120] Furthermore, in the embodiment of the present application, the through hole 21 is set as a strip structure, so that the through hole 21 can be set opposite to the first finger-shaped portion 122, or the through hole 21 can be set opposite to the second finger-shaped portion 123, thereby reducing the number of through holes 21 and facilitating the setting of the through hole 21 on the insulating layer 20.

[0121] It should be noted that one first finger-shaped portion 122 may be disposed opposite to one through hole 21, or one first finger-shaped portion 122 may be disposed opposite to multiple through holes 21, and multiple through holes 21 are sequentially arranged at intervals along the first direction X or the second direction Y. Similarly, one second finger-shaped portion 123 may be disposed opposite to one through hole 21, or one second finger-shaped portion 123 may be disposed opposite to multiple through holes 21, and multiple through holes 21 are sequentially arranged at intervals along the first direction X or the second direction Y.

[0122] Alternatively, if Figures 1 to 6As shown, the through holes 21 in the embodiment of the present application include multiple groups, each group of through holes 21 is arranged corresponding to a first finger-shaped portion 122 or a second finger-shaped portion 123; each group of through holes 21 includes multiple through holes 21, and the multiple through holes 21 are arranged at intervals along the first direction X.

[0123] like Figures 1 to 6 As shown, in the embodiment of the present application, multiple groups of through holes 21 are provided on the insulating layer 20, each group of through holes 21 includes multiple through holes, and the multiple through holes 21 are arranged at intervals along the first direction X or the second direction Y. Each group of through holes 21 is arranged corresponding to a first finger 122 or a second finger 123, so that the corresponding first finger 122 or second finger 123 and the battery cell 40 are connected through each group of through holes 21, thereby collecting the current generated by the battery cell 40.

[0124] In the embodiment of the present application, the through holes 21 are arranged into multiple groups, each group of through holes 21 includes multiple through holes, and the multiple through holes 21 are arranged at intervals along the first direction X or the second direction Y to improve the reliability of the photovoltaic module and avoid the through holes 21 being too large, resulting in the insulation layer 20 being unable to isolate the battery cell 40 and the conductive layer 10, causing a short circuit in the photovoltaic module.

[0125] Optionally, along the direction extending from the tail portion 125 to the head portion 124 , the distance between two adjacent through holes 21 decreases.

[0126] In the embodiment of the present application, the distance between two adjacent through holes 21 is set to decrease along the direction extending from the tail 125 to the head 124, so that more through holes 21 are set in the area close to the edge of the battery cell 40 along the first direction X or the second direction Y, so that the edge area of ​​the battery cell 40 and the conductive layer 10 are connected through more conductive bonding parts 60 to collect the current in the edge area of ​​the battery cell 40, thereby improving the current collection efficiency in the edge area of ​​the battery cell 40 and ensuring the photoelectric conversion efficiency of the photovoltaic module.

[0127] Preferably, the distance between two adjacent through holes 21 is set to gradually decrease along the direction extending from the tail 125 to the head 124. Of course, in the embodiment of the present application, there is no excessive limitation on the decreasing manner of the distance between two adjacent through holes 21, and in actual applications, technicians can set it as needed.

[0128] Alternatively, if Figures 5 to 8As shown, along the first direction X or the second direction Y, the shortest distance between the through hole 21 corresponding to the first finger-shaped portion 122 of the first conductive sheet 13 and the base 121 of the second conductive sheet 14 is greater than the shortest distance between the through hole 21 corresponding to the second finger-shaped portion 123 of the second conductive sheet 14 and the base 121 of the second conductive sheet 14; and / or, the shortest distance between the through hole 21 corresponding to the second finger-shaped portion 123 of the third conductive sheet 15 and the base 121 of the second conductive sheet 14 is greater than the shortest distance between the through hole 21 corresponding to the first finger-shaped portion 122 of the second conductive sheet 14 and the base 121 of the second conductive sheet 14.

[0129] like Figures 5 to 8 As shown, in the embodiment of the present application, along the first direction X or the second direction Y, the shortest distance between the through hole 21 corresponding to the first finger-shaped portion 122 of the first conductive sheet 13 and the base 121 of the second conductive sheet 14 is set to be greater than the shortest distance between the through hole 21 corresponding to the second finger-shaped portion 123 of the second conductive sheet 14 and the base 121 of the second conductive sheet 14. This ensures the reliability of the photovoltaic module and prevents the busbar 30 corresponding to the base 121 of the second conductive sheet 14 from being connected to the first conductive sheet 13, resulting in a short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0130] In the embodiment of the present application, along the first direction X or the second direction Y, the shortest distance between the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 and the base 121 of the second conductive sheet 14 is set to be greater than the shortest distance between the through hole 21 corresponding to the first finger 122 of the second conductive sheet 14 and the base 121 of the second conductive sheet 14. This ensures the reliability of the photovoltaic module and prevents the busbar 30 corresponding to the base 121 of the second conductive sheet 14 from being connected to the third conductive sheet 13, which may cause a short circuit in the photovoltaic module and affect the photoelectric conversion efficiency of the photovoltaic module.

[0131] Optionally, along the first direction X, the shortest distance between the through hole 21 corresponding to the first finger 122 of the second conductive sheet 14 and the through hole 21 corresponding to the second finger 123 of the second conductive sheet 14 is S5, satisfying S5<S1.

[0132] In the embodiment of the present application, along the first direction X, the shortest distance S5 between the through hole 21 corresponding to the first finger-shaped portion 122 of the second conductive sheet 14 and the through hole 21 corresponding to the second finger-shaped portion 123 of the second conductive sheet 14 is set to be smaller than the shortest distance S1 between the through hole 21 corresponding to the first finger-shaped portion 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger-shaped portion 123 of the third conductive sheet 15, so as to ensure the reliability of the photovoltaic module and avoid the busbar 30 arranged corresponding to the base 121 of the second conductive sheet 14 from being conductive to the first conductive sheet 13 or the third conductive sheet 15, resulting in a short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0133] It should be noted that if Figure 1 As shown, when the first finger 122 and the second finger 123 are arranged opposite to each other along the first direction X, the through hole 21 corresponding to the first finger 122 of the second conductive sheet 14 and the through hole 21 corresponding to the second finger 123 of the second conductive sheet 14 are also arranged opposite to each other along the first direction X. S5 refers to the shortest distance between the through hole 21 corresponding to the first finger 122 of the second conductive sheet 14 and the through hole 21 corresponding to the second finger 123 of the second conductive sheet 14, which are arranged opposite to each other along the first direction X.

[0134] like Fig.15 As shown, when the first finger-shaped portion 122 and the second finger-shaped portion 123 are staggered along the first direction X, the through hole 21 corresponding to the first finger-shaped portion 122 of the second conductive sheet 14 and the through hole 21 corresponding to the second finger-shaped portion 123 of the second conductive sheet 14 are also staggered along the first direction X. S5 refers to the shortest distance between the extension line of the through hole 21 corresponding to the first finger-shaped portion 122 of the second conductive sheet 14 along the third direction Z and the through hole 21 corresponding to the second finger-shaped portion 123 of the second conductive sheet 14 along the first direction X.

[0135] Alternatively, if Figure 2 As shown, the conductive backplane disclosed in the embodiment of the present application also includes a busbar 30, which is stacked between the insulating layer 20 and the conductive layer 10 and is arranged opposite to the base 121; along the first direction X, the width of the busbar 30 is K, satisfying, K≤S2; and / or, 0.1≤K / S2≤0.96.

[0136] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14As shown, in the embodiment of the present application, a bus bar 30 is arranged between the conductive layer 10 and the insulating layer 20, and the bus bar 30 is arranged opposite to the base 121. The bus bar 30 is electrically connected to the base 121 so as to collect the current collected by the conductive layer 10 through the bus bar 30 and transmit it to the external circuit.

[0137] In order to reserve sufficient space for the setting of the bus strip 30, in the embodiment of the present application, the width K of the bus strip 30 is set to be less than or equal to the shortest distance S2 of the base 121 of the second conductive sheet 14 along the first direction X or the second direction Y, so as to ensure the reliability of the photovoltaic module and prevent the bus strip 30 from extending out of the base 121 of the second conductive sheet 14 along the first direction X or the second direction Y and being conductive to the first conductive sheet 13 or the second conductive sheet 15, thereby causing a short circuit in the photovoltaic module.

[0138] In the embodiment of the present application, the ratio of the width K of the busbar 30 along the first direction X or the second direction Y to the shortest distance S2 of the base 121 of the second conductive sheet 14 is set to be greater than or equal to 0.1 and less than or equal to 0.96. That is, along the first direction X or the second direction Y, the width K of the busbar 30 is 0.1 to 0.96 times the shortest distance S2 of the base 121 of the second conductive sheet 14. Through the above setting, the width K of the busbar 30 is smaller than the shortest distance S2 of the base 121 of the second conductive sheet 14, so as to ensure the reliability of the photovoltaic module and prevent the busbar 30 from extending out of the base 121 of the second conductive sheet 14 along the first direction X or the second direction Y, and conducting with the first conductive sheet 13 or the second conductive sheet 15, resulting in a short circuit in the photovoltaic module.

[0139] Furthermore, it is also possible to avoid the situation where the width of the busbar 30 along the first direction X or the second direction Y is too small, and the temperature of the busbar 30 rises too quickly during current transmission, causing the busbar 30 to heat up or even burn out.

[0140] like Fig.18As shown, the embodiment of the present application also discloses a photovoltaic module, which includes a battery cell 40, on which an electrical connection portion 50 is provided; a conductive backplane, which is connected to the back of the battery cell 40, and the conductive backplane includes a conductive layer 10, on which an insulating gap 11 is provided, and the insulating gap 11 is used to separate the conductive layer 10 into a plurality of conductive sheets 12, and the conductive sheets 12 have a base 121 and a first finger-shaped portion 122 extending from the base 121 in a first direction X and / or extending from the base 121 in a second direction Y The second finger-shaped portion 123 of the first conductive sheet 13 is opposite to the second direction Y; the conductive sheet 12 includes a first conductive sheet 13, a second conductive sheet 14 and a third conductive sheet 15 arranged at intervals along the first direction X, and an electrical connection point is provided on the conductive sheet 12; a conductive joint 60, the conductive joint 60 is electrically connected between the electrical connection point and the electrical connection portion 50; that is, one end of the conductive joint 60 overlaps the electrical connection point, and the other end overlaps the electrical connection portion 50, so that the electrical connection portion 50 of the battery cell is electrically connected to the electrical connection point of the conductive layer. Along the first direction X, the shortest distance between the electrical connection portion 50 corresponding to the first finger-shaped portion 122 of the first conductive sheet 13 and the electrical connection portion 50 corresponding to the second finger-shaped portion 123 of the third conductive sheet 15 is S1, and the shortest distance of the base 121 of the second conductive sheet 14 is S2, which satisfies 0.05≤S2 / S1≤0.85.

[0141] like Fig.18 As shown, the embodiment of the present application discloses a photovoltaic module, which includes a cell 40. The cell 40 is a core component of the photovoltaic module, which can convert solar energy into electrical energy. The cell 40 has a light-receiving surface facing the sunlight, also called the front side, and the cell 40 also has a backlight surface facing away from the sunlight, also called the back side.

[0142] The conductive backplane in the embodiment of the present application includes an insulating layer 20, a conductive layer 10 and a backplane stacked in sequence. A backplane adhesive film layer is provided on the side of the backplane facing the conductive layer 10. The backplane adhesive film layer can be made of a combination of one or two materials selected from ethylene-octene copolymer (POE) and ethylene-vinyl acetate copolymer (EVA). By providing the backplane adhesive film layer, the connection and fixation between the conductive layer 10 and the backplane can be achieved, and the conductive layer 10 can also be packaged and protected. The backplane can be made of inorganic glass, organic glass, organic polymer materials, etc., and can be flexibly arranged according to actual needs, which is not limited here.

[0143] The back of the cell 40 is connected to a conductive backplane, which can support and protect the cell 40. The conductive layer 10 in the conductive backplane can realize conductive interconnection between multiple cells 40, which saves the process of laying and welding welding strips compared to traditional photovoltaic modules, and can improve the production efficiency of photovoltaic modules. The busbar 30 is integrated in the conductive backplane to use the busbar 30 to collect current and conduct it to the photovoltaic module.

[0144] like Figures 1 to 17 As shown, the conductive backplane in the embodiment of the present application includes a conductive layer 10, on which an insulating gap 11 is provided. The conductive layer 10 is divided into a plurality of conductive sheets 12 by the insulating gap 11, and the plurality of conductive sheets 12 are arranged at intervals along the first direction X. Figures 1 to 15 As shown in FIG. 1 , the conductive sheet 12 includes a first conductive sheet 13, a second conductive sheet 14, and a third conductive sheet 15 arranged at intervals along a first direction X. An insulating gap 11 is provided between two adjacent conductive sheets 12 to isolate the two adjacent conductive sheets 12 through the insulating gap 11 to prevent the two adjacent conductive sheets 12 from being electrically connected, thereby preventing a short circuit in the photovoltaic module. The insulating gap 11 can be processed by laser, stamping, milling cutter, etc. to remove part of the structure of the conductive layer 10 to form a hollow structure in the conductive layer 10.

[0145] Each conductive sheet 12 includes a base 121 and a first finger 122 extending from the base 121 toward a first direction X and / or a second finger 123 extending from the base 121 toward a second direction Y, and the second direction Y is opposite to the first direction X. Exemplarily, the first conductive sheet 13 includes a base 121 and a first finger 122 extending from the base 121 toward the first direction X. The second conductive sheet 14 includes a base 121 and a first finger 122 extending from the base 121 toward the first direction X, and a second finger 123 extending from the base 121 toward the second direction Y. The third conductive sheet 15 includes a base 121 and a second finger 123 extending from the base 121 toward the second direction Y.

[0146] It should be noted that the conductive layer 10 in the embodiment of the present application has conductivity, and the conductive layer 10 can be a metal layer. For example, the conductive layer 10 can be made of one or more combinations of copper, aluminum, copper-aluminum alloy, and aluminum-nickel alloy. In the embodiment of the present application, there are no excessive restrictions on the specific material of the conductive layer 10, and in actual applications, technicians can choose according to needs.

[0147] The photovoltaic module disclosed in the embodiment of the present application further includes a conductive joint 60, which is disposed in the through hole 21 and electrically connected to the electrical connection portion 50 on the cell 40 and the electrical connection point on the conductive sheet 12 to conduct the cell 40 and the conductive layer 10. In this way, the cell 40 can be connected in series or in parallel with each other through the conductive layer 10.

[0148] The conductive joint 60 is made of a conductive material, for example, a conductive paste such as solder paste or conductive glue, and is formed on the cell 40 or the conductive layer 10 by heating or infrared curing. During the lamination of the photovoltaic module, the conductive joint 60 is melted by heat, and then overlaps with the electrode on the cell 40 or the conductive layer 10 through the through hole 21 on the insulating layer 20 to achieve electrical connection. The material of the conductive joint 60 can be selected from an alloy containing tin and bismuth, for example, a tin-bismuth alloy, a tin-lead-bismuth alloy, a tin-bismuth-copper alloy, a tin-bismuth-silver alloy, and the like.

[0149] In the embodiment of the present application, along the first direction X, the shortest distance between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is S1, and the shortest distance between the base 121 of the second conductive sheet 14 is S2, satisfying 0.05≤S2 / S1≤0.85. Through the above arrangement, the current collection efficiency of the photovoltaic module is improved, and the photoelectric conversion efficiency of the photovoltaic module is ensured.

[0150] Illustratively, the ratio of S2 to S1 may be 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, etc.

[0151] If the shortest distance S1 between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is too large along the first direction X, the current collection at the edge of the cell 40 will be poor, affecting the photoelectric conversion efficiency of the photovoltaic module. If the shortest distance S1 between the through hole 21 corresponding to the first finger 122 of the first conductive sheet 13 and the through hole 21 corresponding to the second finger 123 of the third conductive sheet 15 is too small, the design space of the base 121 of the second conductive sheet 14 will be small, resulting in too small distance of the base 121. Since the base 121 of the second conductive sheet 14 is overlapped with the busbar 30, the cell 40 is easily connected to the busbar 30, causing a short circuit in the photovoltaic module, affecting the photoelectric conversion efficiency of the photovoltaic module.

[0152] If the shortest distance S2 of the base 121 of the second conductive sheet 14 is too small, the bus resistance will be too large, affecting the photoelectric conversion efficiency of the photovoltaic module. At the same time, if the distance S2 is too small, the removal of waste wire after the insulating gap is formed will easily cause the base 121 to break, affecting the connection reliability. Furthermore, if the shortest distance S2 of the base 121 of the second conductive sheet 14 is too small, since the base 121 of the second conductive sheet 14 is overlapped with the bus strip 30, the width of the bus strip 30 will also be small, affecting the current transmission efficiency and the photoelectric conversion efficiency of the photovoltaic module.

[0153] Alternatively, if Figures 1 to 18 As shown, the first finger-shaped portion 122 and the second finger-shaped portion 123 in the embodiment of the present application have a head 124 away from the base 121 and a tail 125 close to the base 121; along the direction extending from the tail 125 to the head 124, the width of the first finger-shaped portion 122 and the second finger-shaped portion 123 gradually decreases.

[0154] like Figures 1 to 18 As shown, the first conductive sheet 13, the second conductive sheet 14 and the third conductive sheet 15 in the embodiment of the present application are arranged in sequence in a forked shape along the first direction X. That is, the first finger portion 122 of the first conductive sheet 13 is located between two adjacent second finger portions 123 of the second conductive sheet 14, the first finger portion 122 of the second conductive sheet 14 is located between two adjacent second finger portions 123 of the third conductive sheet 15, and so on.

[0155] Among them, along the direction extending from the tail 125 to the head 124, the width of the first finger 122 and the second finger 123 gradually decreases. The current collected by the first finger 122 and the second finger 123 flows from the head 124 to the tail 125 and converges at the base 121. The current at the head 124 is relatively small, and the current accumulates continuously during the transmission process, and the current at the tail 125 is relatively large. As the current increases, the width of the first finger 122 and the second finger 123 also gradually increases, so that the loss during the current transmission process is low, the current transmission efficiency is improved, and the photoelectric conversion efficiency of the photovoltaic module is ensured.

[0156] As a preferred embodiment, the width of the tail portion 125 is greater than twice the width of the head portion 124 .

[0157] like Figures 1 to 18 As shown, the first finger-shaped portion 122 and the second finger-shaped portion 123 both have a tail portion 125 connected to the base portion 121 and a head portion 124 away from the base portion 121. In the embodiment of the present application, the width of the tail portion 125 is set to be greater than twice the width of the head portion 124. This further reduces the loss during current transmission, improves the current transmission efficiency, and ensures the photoelectric conversion efficiency of the photovoltaic module.

[0158] For example, the width of the tail 125 can be set to three times the width of the head 124, the width of the tail 125 can be set to four times the width of the head 124, or the width of the tail 125 can be set to five times the width of the head 124. Of course, in the embodiment of the present application, there are no excessive restrictions on the specific parameters of the width of the tail 125 and the width of the head 124. In actual applications, technicians can set it as needed, as long as the width of the tail 125 is greater than twice the width of the head 124.

[0159] Alternatively, if Figure 1 As shown, in the embodiment of the present application, the shortest distance between the electrical connection points corresponding to the first finger-shaped portion 122 and the second finger-shaped portion 123 and the end of the head 124 is S3, satisfying 0.3 mm<S3<1 mm.

[0160] like Figure 1 As shown, both the first finger 122 and the second finger 123 have a tail 125 close to the base 121 and a head 124 away from the base 121. The shortest distance between the electrical connection point corresponding to the first finger 122 and the end of the head 124 of the first finger 122 is S3, and the shortest distance between the electrical connection point corresponding to the second finger 123 and the end of the head 124 of the second finger 123 is also S3. Among them, S3 is greater than 0.3 mm and less than 1 mm.

[0161] In the embodiment of the present application, the shortest distance S3 between the electrical connection point corresponding to the first finger-shaped portion 122 or the second finger-shaped portion 123 and the end of the corresponding head 124 is set to be greater than 0.3 mm and less than 1 mm, so as to improve the current collection efficiency, avoid short circuit in the photovoltaic module, and ensure the photoelectric conversion efficiency of the photovoltaic module.

[0162] If the shortest distance S3 between the electrical connection point corresponding to the first finger 122 or the second finger 123 and the end of the head 124 is too large, the current collection efficiency at the edge of the cell 40 will be low, affecting the photoelectric conversion efficiency of the photovoltaic module. If the shortest distance S3 between the electrical connection point corresponding to the first finger 122 or the second finger 123 and the end of the head 124 is too small, the conductive bonding part 60 or other components may be easily offset during the packaging of the photovoltaic module, resulting in a short circuit in the photovoltaic module, affecting the photoelectric conversion efficiency of the photovoltaic module.

[0163] Exemplarily, in an embodiment of the present application, the shortest distance S3 between the electrical connection point corresponding to the first finger-shaped portion 122 or the second finger-shaped portion 123 and the end of the head 124 can be set to 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, etc.

[0164] Alternatively, if Figure 1 As shown, the shortest distance of the base 121 of the second conductive sheet 14 is S2, satisfying S2>0.8 mm.

[0165] like Figure 1 As shown, in the embodiment of the present application, the shortest distance S2 of the base 121 of the second conductive sheet 14 is set to be greater than 0.8 mm. That is, along the first direction X or along the second direction Y, the minimum width of the base 121 of the second conductive sheet 14 is greater than 0.8 mm.

[0166] To prevent the base 121 of the second conductive sheet 14 from being too small, causing the temperature of the second conductive sheet 14 to rise too quickly during current transmission, resulting in the second conductive sheet 14 heating up or even burning out, in this embodiment of the application, the shortest distance S2 of the base 121 of the second conductive sheet 14 is set to be greater than 0.8 mm.

[0167] Exemplarily, the shortest distance S2 of the base 121 of the second conductive sheet 14 may be set to 0.9 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, or the like.

[0168] It should be noted that the thickness of the conductive sheet 12 in the embodiment of the present application is generally greater than or equal to 10 μm and less than or equal to 200 μm. For example, the thickness of the conductive sheet 12 can be 10 μm, 30 μm, 50 μm, 80 μm, 100 μm, 130 μm, 150 μm, 180 μm, 200 μm, etc.

[0169] Alternatively, if Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14 As shown, the photovoltaic module in the embodiment of the present application also includes a busbar 30, which is superimposed on the conductive layer 10, and the base 121 is arranged opposite to the busbar 30; the width of the base 121 arranged opposite to the busbar 30 is S4, satisfying 3mm≤S4≤12mm.

[0170] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14As shown, in the embodiment of the present application, a bus bar 30 is arranged between the conductive layer 10 and the insulating layer 20, and the bus bar 30 is arranged opposite to the base 121. The bus bar 30 is electrically connected to the base 121 so as to collect the current collected by the conductive layer 10 through the bus bar 30 and transmit it to the external circuit.

[0171] Since the width of the busbar 30 is linearly related to its power loss, the wider the busbar 30 is, the smaller its power loss is. In order to ensure that the width of the base 121 disposed opposite to the busbar 30 is greater than the width of the busbar 30 and to reserve sufficient space for the arrangement of the busbar 30, in the embodiment of the present application, the width S4 of the base 121 disposed opposite to the busbar 30 is set to be greater than or equal to 3 mm and less than or equal to 12 mm.

[0172] For example, the width S4 of the base portion 121 disposed opposite to the bus ribbon 30 may be set to 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc.

[0173] Alternatively, if Figures 1 to 18 As shown, the width of the insulating gap 11 in the embodiment of the present application is L, satisfying L≥0.3 mm.

[0174] In the embodiment of the present application, the width L of the insulating gap 11 is set to be greater than or equal to 0.3 mm to ensure that the insulating gap 11 is large enough to avoid short circuit in the photovoltaic module.

[0175] Illustratively, in the embodiment of the present application, the width L of the insulating gap 11 may be 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, etc.

[0176] Alternatively, if Fig.18 As shown, along the third direction Z, the shortest distance between the electrical connection portion 50 and the edge of the battery cell 40 is D1, satisfying D1<3mm; the third direction Z is perpendicular to the first direction X and the second direction Y.

[0177] like Fig.18 As shown, the third direction Z is perpendicular to the first direction X and the second direction Y. Along the third direction Z, the shortest distance D1 between the electrical connection portion 50 and the edge of the battery cell 40 is set to be less than 3 mm, so that the electrical connection portion 50 is closer to the edge of the battery cell 40 along the third direction Z, thereby ensuring the current collection efficiency of the edge area of ​​the battery cell 40 along the third direction Z and improving the photoelectric conversion efficiency of the photovoltaic module.

[0178] Furthermore, the photovoltaic module disclosed in the present application can avoid the risk of hidden cracks that are easy to occur at the edge of the cell 40 during the lamination process of the photovoltaic module because the current generated by the cell 40 is collected by the conductive layer 10 in the conductive backplane. Therefore, along the third direction Z, the shortest distance D1 between the electrical connection portion 50 and the edge of the cell 40 can be set to be smaller, which helps to improve the current collection efficiency of the edge area of ​​the cell 40 along the third direction Z and improve the photoelectric conversion efficiency of the photovoltaic module.

[0179] For example, along the third direction Z, the shortest distance D1 between the electrical connection portion 50 and the edge of the battery cell 40 may be 2.8 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, etc.

[0180] Alternatively, if Fig.18 As shown, along the first direction X, the shortest distance between the electrical connection portion 50 and the edge of the battery cell 40 is D2, satisfying D2<2mm.

[0181] like Fig.18 As shown, along the first direction X, the shortest distance D2 between the electrical connection portion 50 and the edge of the battery cell 40 is set to be less than 2 mm, so that the electrical connection portion 50 is closer to the edge of the battery cell 40 along the first direction X, thereby ensuring the current collection efficiency of the edge area of ​​the battery cell 40 along the first direction X, and improving the photoelectric conversion efficiency of the photovoltaic module.

[0182] Furthermore, since the current generated by the cell 40 is collected by the conductive layer 10 in the back sheet in the present application, the risk of hidden cracks that are easy to occur at the edge of the cell 40 during the lamination of the photovoltaic module can be avoided. Therefore, along the first direction X, the shortest distance D2 between the electrical connection portion 50 and the edge of the cell 40 can be set to be smaller, thereby helping to improve the current collection efficiency of the edge region of the cell 40 along the first direction X and improve the photoelectric conversion efficiency of the photovoltaic module.

[0183] For example, along the first direction X, the shortest distance D2 between the electrical connection portion 50 and the edge of the battery cell 40 may be 1.9 mm, 1.8 mm, 1.7 mm, 1.6 mm, 1.5 mm, 1.4 mm, 1.2 mm, 1.0 mm, 0.8 mm, etc.

[0184] Alternatively, if Fig.18As shown, along the first direction X, the battery cell 40 has a first side 41 and a second side 42 that are oppositely arranged, and along the third direction Z, the battery cell 40 has a third side 43 and a fourth side 44 that are oppositely arranged, a first chamfer 45 is provided between the third side 43 and the first side 41, and a second chamfer 46 is provided between the fourth side 44 and the first side 41, and the third direction Z is perpendicular to the first direction X and the second direction Y; the projection of the electrical connection portion 50 closest to the first chamfer 45 on the battery cell 40 falls into the battery cell 40, and the projection of the electrical connection portion 50 closest to the second chamfer 46 on the battery cell 40 falls into the battery cell 40.

[0185] like Fig.18 As shown, in the embodiment of the present application, a first chamfer 45 is provided between the first side 41 and the third side 43 of the cell 40, and a second chamfer 46 is provided between the first side 41 and the fourth side 44 of the cell 40. By setting the projection of the electrical connection portion 50 closest to the first chamfer 45 on the cell 40 to fall into the cell 40, and setting the projection of the electrical connection portion 50 closest to the second chamfer 46 on the cell 40 to fall into the cell 40, the current collection efficiency of the cell 40 is ensured, and the photoelectric conversion efficiency of the photovoltaic module is improved. Avoiding the electrical connection portion 50 closest to the first chamfer 45 and the second chamfer 46 being provided outside the cell 40, resulting in the inability to effectively collect the current in the cell 40 near the first chamfer 45 and the second chamfer 46, which affects the current collection efficiency of the cell 40, and further affects the photoelectric conversion efficiency of the photovoltaic module.

[0186] Alternatively, if Figure 2 As shown, the conductive backplane in the embodiment of the present application also includes a busbar 30, which is superimposed on the conductive layer 10 and arranged opposite to the base 121; along the first direction X, the width of the busbar 30 is K, satisfying K≤S2; and / or, 0.1≤K / S2≤0.96.

[0187] like Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.10 , Fig.12 and Fig.14 As shown, in the embodiment of the present application, a bus bar 30 is arranged between the conductive layer 10 and the insulating layer 20, and the bus bar 30 is arranged opposite to the base 121. The bus bar 30 is electrically connected to the base 121 so as to collect the current collected by the conductive layer 10 through the bus bar 30 and transmit it to the external circuit.

[0188] In order to reserve sufficient space for the setting of the bus strip 30, in the embodiment of the present application, the width K of the bus strip 30 is set to be less than or equal to the shortest distance S2 of the base 121 of the second conductive sheet 14 along the first direction X or the second direction Y, so as to ensure the reliability of the photovoltaic module and prevent the bus strip 30 from extending out of the base 121 of the second conductive sheet 14 along the first direction X or the second direction Y and being conductive to the first conductive sheet 13 or the second conductive sheet 15, thereby causing a short circuit in the photovoltaic module.

[0189] In the embodiment of the present application, the ratio of the width K of the busbar 30 along the first direction X or the second direction Y to the shortest distance S2 of the base 121 of the second conductive sheet 14 is set to be greater than or equal to 0.1 and less than or equal to 0.96. That is, along the first direction X or the second direction Y, the width K of the busbar 30 is 0.1 to 0.96 times the shortest distance S2 of the base 121 of the second conductive sheet 14. Through the above setting, the width K of the busbar 30 is smaller than the shortest distance S2 of the base 121 of the second conductive sheet 14, so as to ensure the reliability of the photovoltaic module and prevent the busbar 30 from extending out of the base 121 of the second conductive sheet 14 along the first direction X or the second direction Y, and conducting with the first conductive sheet 13 or the second conductive sheet 15, resulting in a short circuit in the photovoltaic module.

[0190] Furthermore, it is also possible to avoid the situation where the width of the busbar 30 along the first direction X or the second direction Y is too small, and the temperature of the busbar 30 rises too quickly during current transmission, causing the busbar 30 to heat up or even burn out.

[0191] Alternatively, if Figures 1 to 18 As shown, along the first direction X, the distance between the head 124 of the first finger-shaped portion 122 of the first conductive sheet 13 and the busbar 30 correspondingly arranged at the base 121 of the second conductive sheet 14 is greater than 0.3 mm; and / or, along the first direction X, the distance between the head 124 of the second finger-shaped portion 123 of the third conductive sheet 15 and the busbar 30 correspondingly arranged at the base 121 of the second conductive sheet 14 is greater than 0.3 mm.

[0192] like Figures 1 to 18 As shown, in the embodiment of the present application, along the first direction X, the distance between the head 124 of the first finger-shaped portion 122 of the first conductive sheet 13 and the busbar 30 correspondingly arranged at the base 121 of the second conductive sheet 14 is set to be greater than 0.3 mm, so as to avoid the head 124 of the first finger-shaped portion 122 of the first conductive sheet 13 being connected to the busbar 30 correspondingly arranged at the base 121 of the second conductive sheet 14, resulting in a local short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0193] Exemplarily, along the first direction X, the distance between the head 124 of the first finger-shaped portion 122 of the first conductive sheet 13 and the busbar 30 corresponding to the base 121 of the second conductive sheet 14 can be set to 0.32 mm, 0.35 mm, 0.38 mm, 0.40 mm, 0.45 mm, 0.50 mm, 0.55 mm, etc.

[0194] like Figures 1 to 18 As shown, in the embodiment of the present application, along the first direction X, the distance between the head 124 of the second finger-shaped portion 123 of the third conductive sheet 15 and the busbar 30 correspondingly arranged at the base 121 of the second conductive sheet 14 is set to be greater than 0.3 mm, so as to avoid the head 124 of the second finger-shaped portion 123 of the third conductive sheet 15 being connected to the busbar 30 correspondingly arranged at the base 121 of the second conductive sheet 14, resulting in a local short circuit in the photovoltaic module and affecting the photoelectric conversion efficiency of the photovoltaic module.

[0195] Exemplarily, along the first direction X, the distance between the head 124 of the second finger-shaped portion 123 of the third conductive sheet 15 and the busbar 30 corresponding to the base 121 of the second conductive sheet 14 can be set to 0.32mm, 0.35mm, 0.38mm, 0.40mm, 0.45mm, 0.50mm, 0.55mm, etc.

[0196] Optionally, along the first direction X, the width of the base 121 corresponding to the busbar 30 is greater than the width of other parts of the base 121 .

[0197] The width of the base 121 in the embodiment of the present application along the first direction X may be inconsistent, and the portion of the base 121 corresponding to the busbar 30 is wider than the portion not corresponding to the busbar 30. That is to say, along the first direction X, the width of the base 121 corresponding to the busbar 30 is greater than the width of other portions of the base 121. This makes the width of the busbar 30 smaller than the width of the corresponding base 121, thereby ensuring the reliability of the photovoltaic module and preventing the busbar 30 from extending out of the base 121 along the first direction X and conducting with the adjacent conductive sheet 12, causing a local short circuit in the photovoltaic module.

[0198] Furthermore, through the above configuration, the width of the busbar 30 along the first direction X can be increased, the resistance of the busbar 30 can be reduced, and the current collection efficiency of the photovoltaic module and the photoelectric conversion efficiency of the photovoltaic module can be improved.

[0199] Of course, the above is only a specific setting method of the width of the base 121 along the first direction X in the embodiment of the present application, and is not intended to be a limitation of the present application. In actual applications, the width of the base 121 along the first direction X may also be consistent.

[0200] Alternatively, if Fig.18As shown, the battery cells 40 in the embodiment of the present application include a plurality of battery cells 40, and the plurality of battery cells 40 are connected in series to form a battery string; along the extension direction of the battery string, the spacing between two adjacent battery cells 40 located in the middle position is greater than or equal to the spacing between two adjacent battery cells 40 in the battery string, and the busbar 30 is arranged between two adjacent battery cells 40 located in the middle position.

[0201] The photovoltaic module disclosed in the embodiment of the present application includes a plurality of battery cells 40, which are arranged at intervals, and the plurality of battery cells 40 are connected in series through a conductive layer 10 to form a battery string. Along the extension direction of the battery string, the spacing between two adjacent battery cells 40 located in the middle position is greater than or equal to the spacing between two adjacent battery cells 40 in the battery string, and the busbar 30 is arranged between two adjacent battery cells 40 located in the middle position.

[0202] Through the above-mentioned arrangement, the distance between two adjacent battery cells 40 located in the middle position can be adjusted so that the distance between two adjacent battery cells 40 located in the middle position is larger. The busbar 30 is arranged between two adjacent battery cells 40 located in the middle position so that the width of the busbar 30 along the first direction X is increased, thereby reducing the resistance of the busbar 30 and improving the current collection efficiency of the photovoltaic module and the photoelectric conversion efficiency of the photovoltaic module.

[0203] Furthermore, the above arrangement eliminates the need to adjust the electrical connection points to adjust the arrangement space of the busbar 30 , which helps to reduce the processing difficulty of the photovoltaic module and improve the process yield and reliability of the photovoltaic module.

[0204] Optionally, along the third direction Z, the shortest distance between the electrical connection portion 50 corresponding to the battery cell 40 closest to the bus bar 30 and the edge of the battery cell 40 is greater than the shortest distance between the electrical connection portion 50 corresponding to the battery cell 40 relatively far from the bus bar 30 and the edge of the battery cell 40; the third direction Z is perpendicular to the first direction X and the second direction Y.

[0205] In the embodiment of the present application, along the third direction Z, the shortest distance between the electrical connection portion 50 corresponding to the cell 40 closest to the busbar 30 and the edge of the cell 40 is set to be greater than the shortest distance between the electrical connection portion 50 corresponding to the cell 40 relatively far from the busbar 30 and the edge of the cell 40. Through the above arrangement, the installation space of the busbar 30 is increased, and the busbar 30 is made wide enough, which helps to reduce the resistance of the busbar 30, improve the current collection efficiency of the photovoltaic module, and the photoelectric conversion efficiency of the photovoltaic module.

[0206] Alternatively, if Figures 1 to 17As shown, the conductive backplane in the embodiment of the present application also includes an insulating layer 20, which is arranged between the conductive layer 10 and the battery cell 40; a through hole 21 is opened on the insulating layer 20, and the through hole 21 passes through the insulating layer 20 to leak out the conductive layer 10; the conductive bonding portion 60 is passed through the through hole 21 and is electrically connected between the electrical connection point and the electrical connection portion 50.

[0207] like Figures 1 to 17 As shown, the conductive backplane disclosed in the embodiment of the present application also includes an insulating layer 20, which is stacked between the conductive layer 10 and the battery cell 40. The insulating layer 20 isolates the conductive layer 10 and the battery cell 40 to prevent the photovoltaic module from short-circuiting.

[0208] The insulating layer 20 is provided with a through hole 21, which penetrates the insulating layer 20 to expose the conductive layer 10. The conductive joint 60 is provided in the through hole 21 and is electrically connected between the electrical connection point and the electrical connection part 50 to conduct the conductive layer 10 and the battery cell 40, so that the conductive layer 10 can collect the current generated by the battery cell 40 and transmit the collected current to the external circuit.

[0209] Furthermore, the conductive layer 10 can also connect adjacent cells 40 in series to avoid defects such as cracks and bending of the cells 40 during the lamination process of the photovoltaic module, thereby improving the process yield and reliability of the photovoltaic module.

[0210] It should be noted that the insulating layer 20 in the embodiment of the present application has insulating properties. For example, the insulating layer 20 can be an EVA film, which is a film made of ethylene-vinyl acetate copolymer. Of course, in the embodiment of the present application, there are no excessive restrictions on the specific material of the insulating layer 20. In actual applications, technicians can choose according to needs.

[0211] Alternatively, if Figure 7 , Figure 8 , Figures 11 to 14 As shown, the through hole 21 in the embodiment of the present application is a strip-shaped structure, and the through hole 21 extends along the first direction X.

[0212] As an optional implementation, in the embodiment of the present application, the through hole 21 can be set as a strip structure, and the through hole 21 extends along the first direction X. The through hole 21 is set so that the conductive bonding portion 60 can be penetrated into the insulating layer 20 and electrically connected between the electrical connection point and the electrical connection portion 50 to conduct the conductive layer 10 and the battery cell 40, so as to collect the current generated by the battery cell 40 through the conductive layer 10.

[0213] Furthermore, in the embodiment of the present application, the through hole 21 is set as a strip structure, so that the through hole 21 can be set opposite to the first finger-shaped portion 122, or the through hole 21 can be set opposite to the second finger-shaped portion 123, thereby reducing the number of through holes 21 and facilitating the setting of the through hole 21 on the insulating layer 20.

[0214] It should be noted that one first finger-shaped portion 122 may be disposed opposite to one through hole 21, or one first finger-shaped portion 122 may be disposed opposite to multiple through holes 21, and multiple through holes 21 are sequentially arranged at intervals along the first direction X or the second direction Y. Similarly, one second finger-shaped portion 123 may be disposed opposite to one through hole 21, or one second finger-shaped portion 123 may be disposed opposite to multiple through holes 21, and multiple through holes 21 are sequentially arranged at intervals along the first direction X or the second direction Y.

[0215] Alternatively, if Figures 1 to 6 As shown, the through holes 21 in the embodiment of the present application include multiple groups, each group of through holes 21 is arranged corresponding to a first finger-shaped portion 122 or a second finger-shaped portion 123, and each group of through holes 21 includes multiple through holes 21, and the multiple through holes 21 are arranged at intervals along the first direction X; the conductive bonding portion 60 also includes multiple conductive bonding portions 60, and each conductive bonding portion 60 is arranged corresponding to a through hole 21.

[0216] like Figures 1 to 6 As shown, in the embodiment of the present application, multiple groups of through holes 21 are provided on the insulating layer 20, each group of through holes 21 includes multiple through holes, and the multiple through holes 21 are arranged at intervals along the first direction X or the second direction Y. Each group of through holes 21 is arranged corresponding to a first finger 122 or a second finger 123, so that the corresponding first finger 122 or second finger 123 and the battery cell 40 are connected through each group of through holes 21, thereby collecting the current generated by the battery cell 40.

[0217] In the embodiment of the present application, the through holes 21 are arranged into multiple groups, each group of through holes 21 includes multiple through holes, and the multiple through holes 21 are arranged at intervals along the first direction X or the second direction Y to improve the reliability of the photovoltaic module and avoid the through holes 21 being too large, resulting in the insulation layer 20 being unable to isolate the battery cell 40 and the conductive layer 10, causing a short circuit in the photovoltaic module.

[0218] Alternatively, if Fig.17 and Fig.18 As shown, the through hole 21 has a first projection on the plane where the battery cell 40 is located, and the conductive bonding portion 60 has a second projection on the plane where the battery cell 40 is located, and the second projection falls within the first projection.

[0219] like Fig.17 and Fig.18As shown, in the embodiment of the present application, the second projection of the conductive joint 60 on the plane where the cell 40 is located is set to fall within the first projection of the through hole 21 on the plane where the cell 40 is located. So that the conductive joint 60 can pass through the through hole 21 to connect between the electrical connection point and the electrical connection part 50, thereby conducting the conductive layer 10 and the cell 40. Avoid the insulating layer 20 covering the conductive joint 60, resulting in poor contact between the conductive layer 10 and the cell 40, which affects the photoelectric conversion efficiency of the photovoltaic module.

[0220] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0221] Although the optional embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0222] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal 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 article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0223] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. At the same time, for those skilled in the art, according to the principle and implementation mode of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A conductive backplane, characterized in that: include: A conductive layer, wherein an insulating gap is provided on the conductive layer, wherein the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, wherein the conductive sheet comprises a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, wherein the first direction is opposite to the second direction; and the conductive sheet comprises a first conductive sheet, a second conductive sheet, and a third conductive sheet arranged at intervals along the first direction; an insulating layer, the insulating layer being stacked on the conductive layer, the insulating layer being provided with a through hole, the through hole penetrating the insulating layer to expose the conductive layer; Along the first direction, the shortest distance between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the through hole corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S2 / S1≤0.

85.

2. The conductive backplane according to claim 1, characterized in that: The first finger-shaped portion and the second finger-shaped portion have a head portion away from the base portion and a tail portion close to the base portion, and the shortest distance between the through hole corresponding to the first finger-shaped portion and the second finger-shaped portion and the end of the head portion is S3; satisfying 0.3mm<S3<1mm.

3. The conductive backplane according to claim 1, characterized in that: Satisfy S2>0.8mm.

4. The conductive backplane according to claim 3, characterized in that: The conductive backplane further includes a busbar, which is disposed between the conductive layer and the insulating layer and is disposed opposite to the base; The width of the base portion arranged opposite to the busbar is S4, satisfying 3mm≤S4≤12mm.

5. The conductive backplane according to claim 1, characterized in that: The width of the insulating gap is L, satisfying L≥0.3 mm.

6. The conductive backplane according to claim 5, characterized in that: Satisfies 0.6mm≤L≤1.5mm.

7. The conductive backplane according to claim 1, characterized in that: Along the first direction, the first finger-shaped portion and the second finger-shaped portion are arranged opposite to each other; Alternatively, along the first direction, the first finger-shaped portion and the second finger-shaped portion are staggered.

8. The conductive backplane according to claim 1, characterized in that: The through hole is a strip-shaped structure, and the through hole extends along the first direction.

9. The conductive backplane according to claim 2, characterized in that: The through holes include a plurality of groups, and each group of the through holes is arranged corresponding to one of the first finger-shaped portions or one of the second finger-shaped portions; Each group of through holes includes a plurality of through holes, and the plurality of through holes are arranged at intervals along the first direction.

10. The conductive backplane according to claim 9, characterized in that: Along the direction extending from the tail portion to the head portion, the distance between two adjacent through holes decreases.

11. The conductive backplane according to claim 1, characterized in that: The shortest distance between the through hole corresponding to the first finger-shaped portion of the first conductive sheet and the base of the second conductive sheet is greater than the shortest distance between the through hole corresponding to the second finger-shaped portion of the second conductive sheet and the base of the second conductive sheet; And / or, the shortest distance between the through hole corresponding to the second finger-shaped portion of the third conductive sheet and the base of the second conductive sheet is greater than the shortest distance between the through hole corresponding to the first finger-shaped portion of the second conductive sheet and the base of the second conductive sheet.

12. The conductive backplane according to claim 1, characterized in that: Along the first direction, the shortest distance between the through hole corresponding to the first finger-shaped portion of the second conductive sheet and the through hole corresponding to the second finger-shaped portion of the second conductive sheet is S5, and S5 is satisfied. ＜ S1.

13. The conductive backplane according to claim 1, characterized in that: The conductive backplane further includes a busbar, which is stacked between the insulating layer and the conductive layer and arranged opposite to the base; Along the first direction, the width of the busbar is K, satisfying K≤S2; and / or 0.1≤K / S2≤0.

96.

14. A photovoltaic module, characterized in that: include: A battery cell, wherein an electrical connection portion is provided on the battery cell; A conductive backplane, the conductive backplane is connected to the back side of the battery cell, the conductive backplane comprises a conductive layer, an insulating gap is provided on the conductive layer, the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, the conductive sheet comprises a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the first direction is opposite to the second direction; the conductive sheet comprises a first conductive sheet, a second conductive sheet and a third conductive sheet arranged at intervals along the first direction, and an electrical connection point is provided on the conductive sheet; A conductive bonding portion, one end of the conductive bonding portion is connected to the electrical connection point and the other end is connected to the electrical connection portion; along the first direction, the shortest distance between the electrical connection point corresponding to the first finger-shaped portion of the first conductive sheet and the electrical connection point corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S2 / S1≤0.

85.

15. The photovoltaic module according to claim 14, characterized in that: The first finger-shaped portion and the second finger-shaped portion have a head portion away from the base portion and a tail portion close to the base portion; Along a direction extending from the tail portion to the head portion, widths of the first finger-shaped portion and the second finger-shaped portion gradually decrease.

16. The photovoltaic module according to claim 15, characterized in that: The width of the tail portion is greater than twice the width of the head portion.

17. The photovoltaic module according to claim 15, characterized in that: The shortest distance between the electrical connection point corresponding to the first finger-shaped portion and the second finger-shaped portion and the end of the head is S3, satisfying 0.3 mm<S3<1 mm.

18. The photovoltaic module according to claim 14, characterized in that: Satisfy S2>0.8mm.

19. The photovoltaic module according to claim 18, characterized in that: The photovoltaic assembly further comprises a busbar, the busbar being superposed on the conductive layer and the base being arranged opposite to the conductive layer; The width of the base portion arranged opposite to the busbar is S4, satisfying 3mm≤S4≤12mm.

20. The photovoltaic module according to claim 14, characterized in that: The width of the insulating gap is L, satisfying L≥0.3 mm.

21. The photovoltaic module according to claim 14, characterized in that: Along the third direction, the shortest distance between the electrical connection portion and the edge of the battery cell is D1, satisfying D1<3mm; The third direction is perpendicular to the first direction and the second direction.

22. The photovoltaic module according to claim 14, characterized in that: Along the first direction, the shortest distance between the electrical connection portion and the edge of the battery cell is D2, satisfying D2<2mm.

23. The photovoltaic module according to claim 14, characterized in that: Along the first direction, the battery cell has a first side and a second side that are opposite to each other, and along the third direction, the battery cell has a third side and a fourth side that are opposite to each other, a first chamfer is formed between the third side and the first side, and a second chamfer is formed between the fourth side and the first side, and the third direction is perpendicular to the first direction and the second direction; The projection of the electrical connection portion closest to the first chamfer on the battery cell falls within the battery cell, and the projection of the electrical connection portion closest to the second chamfer on the battery cell falls within the battery cell.

24. The photovoltaic module according to claim 15, characterized in that: The conductive backplane further comprises a busbar, which is superposed on the conductive layer and arranged opposite to the base; Along the first direction, the width of the busbar is K, satisfying K≤S2; and / or 0.1≤K / S2≤0.

96.

25. The photovoltaic module according to claim 24, characterized in that: Along the first direction, the distance between the head of the first finger-shaped portion of the first conductive sheet and the busbar correspondingly arranged at the base of the second conductive sheet is greater than 0.3 mm; And / or, along the first direction, a distance between the head of the second finger-shaped portion of the third conductive sheet and the busbar correspondingly arranged at the base of the second conductive sheet is greater than 0.3 mm.

26. The photovoltaic module according to claim 25, characterized in that: Along the first direction, the width of the base portion corresponding to the busbar is greater than the width of other portions of the base portion.

27. The photovoltaic module according to claim 19, characterized in that: The battery cells include a plurality of battery cells, and the plurality of battery cells are connected in series to form a battery string; Along the extension direction of the battery string, the distance between two adjacent battery sheets located in the middle is greater than or equal to the distance between two adjacent battery sheets in the battery string, and the busbar is arranged between two adjacent battery sheets located in the middle.

28. The photovoltaic module according to claim 27, characterized in that: Along the third direction, the shortest distance between the electrical connection portion corresponding to the battery cell closest to the busbar and the edge of the battery cell is greater than the shortest distance between the electrical connection portion corresponding to the battery cell relatively far from the busbar and the edge of the battery cell; The third direction is perpendicular to the first direction and the second direction.

29. The photovoltaic assembly according to claim 14, characterized in that: The conductive backplane further comprises an insulating layer, wherein the insulating layer is disposed between the conductive layer and the battery cell; A through hole is formed on the insulating layer, and the through hole penetrates the insulating layer to allow the conductive layer to leak out; The conductive connecting portion passes through the through hole and is electrically connected between the electrical connection point and the electrical connection portion.

30. The photovoltaic module according to claim 29, characterized in that: The through hole is a strip-shaped structure, and the through hole extends along the first direction.

31. The photovoltaic module according to claim 29, characterized in that: The through holes include a plurality of groups, each group of the through holes is arranged corresponding to one of the first finger-shaped portions or one of the second finger-shaped portions, each group of the through holes includes a plurality of through holes, and the plurality of through holes are arranged at intervals along the first direction; The conductive bonding parts also include a plurality of conductive bonding parts, and each conductive bonding part is arranged corresponding to one of the through holes.

32. The photovoltaic module according to claim 31, characterized in that: The through hole has a first projection on the plane where the battery cell is located, and the conductive bonding portion has a second projection on the plane where the battery cell is located, and the second projection falls within the first projection.

33. A photovoltaic module, characterized in that: include: Battery cells; A conductive backplane, the conductive backplane is connected to the back side of the battery cell, the conductive backplane comprises a conductive layer, an insulating gap is provided on the conductive layer, the insulating gap is used to separate the conductive layer into a plurality of conductive sheets, the conductive sheet comprises a base and a first finger-shaped portion extending from the base toward a first direction and / or a second finger-shaped portion extending from the base toward a second direction, the first direction is opposite to the second direction; the conductive sheet comprises a first conductive sheet, a second conductive sheet and a third conductive sheet arranged at intervals along the first direction; An electrical connection portion, the electrical connection portion is disposed on the battery sheet and is used to be electrically connected to the conductive sheet; Along the first direction, the shortest distance between the electrical connection portion corresponding to the first finger-shaped portion of the first conductive sheet and the electrical connection portion corresponding to the second finger-shaped portion of the third conductive sheet is S1, and the shortest distance of the base of the second conductive sheet is S2, satisfying 0.05≤S1 / S2≤0.85.

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