Photovoltaic module and manufacturing method thereof

Abstract

The invention relates to the technical field of solar cells, in particular to a photovoltaic module and a manufacturing method thereof. The photovoltaic module comprises a battery string group, a second bus bar and a connecting part. The second bus bar is located on one side or two sides of the battery string group, the second bus bar is located on the backlight surface of the battery string group in the thickness direction of the battery piece, and the projection of the second bus bar and the projection of the battery piece have an overlapping part, so that the total size of the second bus bar and the battery string in the first direction can be reduced; the arrangement space of the second bus bar and the battery string is reduced, so that more battery pieces can be arranged in a limited space, the screen-to-body ratio of the photovoltaic module is improved, and the output power of the photovoltaic module is improved. And the second bus bar is electrically connected with the series welding strip through the connecting part, so that the risks of fracture damage, welding spot cracking and the like caused by bending of the edge welding strip are reduced, the risk of hidden cracking in the lamination process due to local increase of the thickness of the battery layer is also reduced, and the processing yield and the working stability of the photovoltaic module are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar cells, in particular to a photovoltaic module and a manufacturing method thereof. BACKGROUND

[0002] The photovoltaic module comprises a plurality of cell strings, each cell string comprising a plurality of cell pieces, the plurality of cell strings are arranged along a first direction and electrically connected to form a cell string group, the plurality of cell string groups are arranged along a second direction, the extension direction of the cell string group is recorded as the first direction, and the first direction intersects the second direction.

[0003] The photovoltaic module further comprises a bus bar extending along the second direction, the bus bar is located on one side or both sides of the cell string group in the first direction, and the bus bar is electrically connected to the adjacent cell string group to realize series connection or parallel connection of the adjacent cell string groups.

[0004] Generally, the bus bar is located on the outer side of the cell string group in the first direction, that is, the bus bar and the adjacent cell piece have a gap in the first direction, and the solder strip on the cell string group extends outward along the first direction and is welded and fixed to the bus bar.

[0005] However, the above gap causes a large arrangement space of the bus bar and the cell string group, and in a limited space, in order to meet the arrangement space of the bus bar, the number of cell strings needs to be sacrificed, which affects the output power of the photovoltaic module.

[0006] Therefore, how to reduce the arrangement space of the bus bar and the cell string group to improve the output power of the photovoltaic module is an important problem to be solved in the field. SUMMARY

[0007] In view of this, the present application provides a photovoltaic module and a manufacturing method thereof, which can reduce the arrangement space of the bus bar and the cell string group to improve the output power of the photovoltaic module.

[0008] The first aspect of the present application provides a photovoltaic module, which comprises a cell string group, a second bus bar and a connecting part. The cell string group comprises at least two cell strings arranged along a first direction, the cell string comprises a plurality of cell pieces and a string solder strip, in the first direction, the adjacent cell pieces are electrically connected through the string solder strip, the adjacent cell strings are electrically connected through the string solder strip, the plurality of cell string groups are arranged along a second direction, and the first direction intersects the second direction. In the first direction, the second bus bar is located on one side or both sides of the cell string group, in the thickness direction of the cell piece, the connecting part is located on the side of the second bus bar facing the cell piece, the second bus bar and the string solder strip are electrically connected through the connecting part, and the adjacent cell string groups are electrically connected through the second bus bar. The second bus bar is located on the back surface of the cell string group, in the thickness direction of the cell piece, the projection of the second bus bar and the projection of the cell piece have an overlapping part.

[0009] In some possible design, the connecting part is welded or hot-pressed with the second busbar. Alternatively, the second busbar and the connecting part are integrally formed.

[0010] In some possible design, the second busbar includes a first edge and a second edge arranged along the first direction, in which the first edge is located at a side of the second busbar facing the battery string group, and the second edge is located at a side of the second busbar away from the battery string group. In the thickness direction of the battery sheet, the edge of the connecting part is aligned with the second edge.

[0011] In some possible design, in the first direction, the width of the second busbar is H1, and the width of the connecting part is H2, 1.3 < H1 / H2 ≤ 75. In the second direction, the length of the connecting part is less than the length of the second busbar.

[0012] In some possible design, the string ribbon includes an edge ribbon, and the edge ribbon includes a first body and a second body arranged along the first direction, the first body is electrically connected with the battery sheet, and the second body is electrically connected with the connecting part. In the second direction, the width of the second body is greater than the width of the first body.

[0013] In some possible design, in the thickness direction of the battery sheet, the thickness of the second body is less than the thickness of the first body.

[0014] In some possible design, the edge ribbon is located at the light-receiving surface or the back surface of the battery sheet. When the edge ribbon is located at the light-receiving surface of the battery sheet, in the thickness direction of the battery sheet, the distance between the light-receiving surface of the first body and the back surface of the battery sheet is L1, the distance between the light-receiving surface of the second busbar and the back surface of the battery sheet is L2, and the thickness of the connecting part is L3, L2 ≤ L3 < L1, or L2 < L3 ≤ L1. When the edge ribbon is located at the back surface of the battery sheet, in the thickness direction of the battery sheet, the distance between the light-receiving surface of the first body and the light-receiving surface of the second busbar is L4, the distance between the back surface of the first body and the light-receiving surface of the second busbar is L5, and the thickness of the connecting part is L6, L5 ≤ L6 < L4, or L5 < L6 ≤ L4.

[0015] In some possible design, the cross-sectional shape of the connecting part is rectangular.

[0016] In some possible design, the photovoltaic module further includes an insulating strip, and in the thickness direction of the battery sheet, the insulating strip is located between the second busbar and the battery sheet.

[0017] In some possible design, in the first direction, the insulating strip extends to the outside of the battery sheet in the direction towards the connecting part.

[0018] In some possible design, the number of the insulation strips is one in the second direction. Alternatively, the number of the insulation strips is multiple in the second direction, and each insulation strip corresponds to one battery string group. Alternatively, the number of the insulation strips is multiple in the second direction, and one insulation strip is connected to at least two battery string groups.

[0019] The second aspect of the present application provides a method for manufacturing a photovoltaic module, the method comprising: Preparation of a battery string group, the battery string group comprising at least two battery strings arranged along a first direction, the battery string comprising a plurality of battery pieces and a string tab, in the first direction, the battery pieces are electrically connected by the string tab between adjacent battery pieces, and the battery strings are electrically connected by the string tab between adjacent battery strings.

[0020] Arranging a plurality of battery string groups along a second direction, the first direction intersecting the second direction.

[0021] In the first direction, the connecting part is placed on one side or both sides of the battery string group, the connecting part extends along the second direction, and in the thickness direction of the battery piece, the connecting part is located on the back light surface of the battery string group. The connecting part is welded and fixed with the string tab.

[0022] Laying an encapsulation layer and a cover plate on the light surface and the back light surface of the battery string group, laminating to form a laminated part.

[0023] Installing a frame on the edge of the laminated part to form a photovoltaic module.

[0024] Before or after the step of placing the connecting part on one side or both sides of the battery string group, the method for manufacturing a photovoltaic module further comprises: welding and fixing the connecting part on the second bus bar.

[0025] In some possible design, the string tab comprises an edge tab, and before the step of preparing the battery string group, the method for manufacturing a photovoltaic module comprises: Flattening the end of the edge tab to form a second body.

[0026] The step of welding and fixing the connecting part with the string tab comprises.

[0027] Welding and fixing the connecting part with the second body.

[0028] In some possible design, the step of preparing the battery string group comprises: Arranging a plurality of battery pieces along a first direction.

[0029] Placing the string tab on the battery piece and welding and fixing to form a battery string.

[0030] Arranging at least two battery strings along a first direction.

[0031] Welding and fixing the string tabs of adjacent battery strings to form a battery string group.

[0032] In some possible design, the string ribbon includes a first string ribbon and a second string ribbon, and the step of preparing the battery string group includes: arranging a plurality of battery pieces in a first direction.

[0033] placing the first string ribbon on the battery pieces and welding to form a battery string.

[0034] arranging at least two battery strings in the first direction.

[0035] placing two ends of the second string ribbon on adjacent battery strings in the first direction respectively and welding to form the battery string group.

[0036] In some possible design, before the step of arranging at least two battery strings in the first direction, the method for manufacturing the photovoltaic module further includes: placing an insulation strip on the battery string, and the insulation strip is located on the back surface of the battery piece in the thickness direction of the battery piece.

[0037] fixing the insulation strip and the battery string by a spot pressing process.

[0038] In some possible design, before the step of welding the connecting part and the string ribbon, the method for manufacturing the photovoltaic module further includes: placing an insulation strip on the battery string group, and the insulation strip is located on the back surface of the battery piece in the thickness direction of the battery piece.

[0039] fixing the insulation strip and the battery string group by a spot pressing process.

[0040] In the present application, the second bus bar is located on the back surface of the battery piece, so that part of the structure of the second bus bar is shielded by the battery piece. Without adjusting the size of the battery piece and the second bus bar in the first direction, the total size of the second bus bar and the battery string in the first direction can be reduced, thereby reducing the arrangement space of the second bus bar and the battery string, so as to arrange more battery pieces in the limited space, thereby improving the screen ratio of the photovoltaic module and the output power of the photovoltaic module.

[0041] The connection part electrically connects the second bus bar and the edge ribbon by extending in the third direction, which reduces the risk of breakage and damage of the edge ribbon due to bending, cracking of the welding point, and the risk of hidden cracks caused by the local increase of the thickness of the battery layer during the lamination process, thereby improving the processing yield and working stability of the photovoltaic module.

[0042] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 The photovoltaic module provided in this application is shown in some embodiments as a structural cross-sectional view. Figure 2 This is a partial structural diagram of the battery layer in some embodiments; Figure 3 This is a top view of the battery layer in some embodiments; Figure 4 for Figure 3 An enlarged view of part A in the image; Figure 5 for Figure 3 An enlarged view of part B in the image; Figure 6 A cross-sectional view of the connection structure between the first busbar and the battery string in the related technology; Figure 7 A cross-sectional view of the connection structure between the second busbar and the battery string provided in this application in a first embodiment; Figure 8 for Figure 6 A schematic diagram of the structure in which the first busbar is folded to the back surface of the solar cell; Figure 9 This is a top view of the connection structure between the second busbar and the connecting part; Figure 10 A top view of the connection structure between the connector and the edge weld strip from a third-party perspective; Figure 11 This is a schematic diagram of a partial structure of the edge solder strip; Figure 12 A cross-sectional view of the connection structure between the second busbar and the battery string provided in this application in a second embodiment; Figure 13 This is a cross-sectional view of the insulating strip in some embodiments; Figure 14 A bottom view of the connection structure between the insulating strip and the battery cell in the edge region in some embodiments; Figure 15 A bottom view of the connection structure between the insulating strip and the battery cell in the edge region in some other embodiments; Figure 16 A bottom view of the connection structure between the insulating strip and the edge region of the battery cell in some other embodiments; Figure 17A cross-sectional view of the connection structure between the second busbar and the battery string provided in this application in a third embodiment; Figure 18 A cross-sectional view of the connection structure between the second busbar and the battery string provided in this application in the fourth embodiment; Figure 19 A flowchart of the photovoltaic module manufacturing method provided in this application in the first embodiment; Figure 20 A flowchart of the photovoltaic module manufacturing method provided in this application in a second embodiment; Figure 21 A flowchart of some steps in some embodiments of the photovoltaic module manufacturing method provided in this application; Figure 22 This is a schematic diagram of the battery string assembly in the first embodiment; Figure 23 Here is a flowchart of step A1 in some embodiments; Figure 24 This is a schematic diagram of the battery string assembly in the second embodiment; Figure 25 Here is a flowchart of step A1 in some other embodiments; Figure 26 This is a flowchart illustrating the connection between the insulating strip and the battery string in some embodiments; Figure 27 This is a flowchart illustrating the connection between the insulating strip and the battery string in some other embodiments; Figure 28 A cross-sectional view of the connection structure between the first interconnecting bar and the battery string in the related technology; Figure 29 Cross-sectional views of the connection structure between the second interconnecting bar and the battery string provided in this application in some embodiments; Figure 30 for Figure 28 A schematic diagram of the structure in which the first interconnecting strip is folded to the back surface of the battery cell; Figure 31 A top view of the connection structure between the second interconnecting bar and the interconnecting part from a third-party perspective; Figure 32 A top view of the connection structure between the interconnection section and the electrical connector from a third-party perspective; Figure 33 This is a partial structural schematic diagram of an electrical connector in some embodiments; Figure 34 This is a top view of the electrical connector in some other embodiments; Figure 35 This is a partial structural schematic diagram of the electrical connector in some further embodiments; Figure 36Cross-sectional view of the connection structure between the second interconnecting bar and the battery string in some other embodiments; Figure 37 This is a sectional view of the isolation component; Figure 38 A bottom view of the connection structure between the separator and the first end battery cell in some embodiments; Figure 39 A bottom view of the connection structure between the separator and the first end battery cell in some other embodiments; Figure 40 A bottom view of the connection structure between the separator and the first end battery cell in some other embodiments; Figure 41 A cross-sectional view of the middle region of the battery string in one embodiment; Figure 42 A cross-sectional view of the middle region of the battery string in another embodiment; Figure 43 A flowchart of the photovoltaic module manufacturing method provided in this application in a third embodiment; Figure 44 A flowchart of the photovoltaic module manufacturing method provided in this application in the fourth embodiment; Figure 45 A flowchart of part of step S1 in the first embodiment; Figure 46 for Figure 45 The steps in this process are shown in flowcharts in some embodiments; Figure 47 This is a flowchart of part of step S1 in the second embodiment; Figure 48 for Figure 47 The steps in this process are shown in flowcharts in some embodiments; Figure 49 A flowchart of part of step S1 in the third embodiment; Figure 50 This is a flowchart of part of step S1 in the fourth embodiment.

[0045] Figure label: 10-Cover plate; 101-First cover plate; 102-Second cover plate; 20 - Encapsulation layer; 201 - First adhesive film; 202 - Second adhesive film; 30-Battery layer; 301-Battery cell; 3011-First end battery cell; 3012-Second end battery cell; 302-Series welding strip; 3021-First welding strip; 3022-Second welding strip; 303-Battery string; 3031-First battery string; 3032-Second battery string; 304-Bus unit; 305-Battery string assembly; 1 - busbar; 11 - first busbar; 111 - first gap; 12 - second busbar; 121 - first edge; 122 - second edge; 13 - connecting part; 2 - interconnecting strip; 21 - first interconnecting strip; 211 - second gap; 22 - second interconnecting strip; 23 - interconnecting part; 3 - edge solder strip; 31 - first body; 32 - second body; 4 - electrical connector; 41 - electrical connecting body; 411 - first electrical connecting body; 412 - second electrical connecting body; 42 - electrical connecting part; 421 - first connecting section; 422 - second connecting section; 43 - first electrical connector; 44 - second electrical connector; 5 - insulating strip; 51 - first layer body; 52 - second layer body; 53 - third layer body; 6 - insulating member; 61 - first insulating layer; 62 - second insulating layer; 63 - third insulating layer. DETAILED DESCRIPTION

[0046] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0047] It should be clear that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0048] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0049] It should be understood that the term "and / or" used herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0050] The first aspect of the present application provides a photovoltaic module, Figure 1 The structure of the photovoltaic module provided by the present application in some embodiments is shown in the cross-sectional view as Figure 1 As shown, the photovoltaic module includes a cover plate 10, an encapsulation layer 20 and a cell layer 30.

[0051] The cover plate 10 includes a first cover plate 101 and a second cover plate 102 arranged along the third direction Z. The encapsulation layer 20 and the battery layer 30 are located between the first cover plate 101 and the second cover plate 102. A portion of the encapsulation layer 20 is located between the battery layer 30 and the first cover plate 101, and another portion of the encapsulation layer 20 is located between the battery layer 30 and the second cover plate 102, so as to achieve the encapsulation and fixation of the cover plate 10 and the battery layer 30.

[0052] At least one of the first cover plate 101 and the second cover plate 102 is made of a light-transmitting material, which is beneficial to improving the photoelectric conversion efficiency of the photovoltaic module.

[0053] The first cover plate 101 can be made of one of the following rigid materials: tempered glass, PET (polyethylene terephthalate), or PC (polycarbonate). Alternatively, the first cover plate 101 can be made of one of the following flexible materials: PVF (polyvinyl fluoride), ETFE (ethylene-tetrafluoroethylene copolymer), or PVDF (polyvinylidene fluoride). All of these materials have high light transmittance, ensuring that more light reaches the battery layer, thereby increasing the light absorption of the photovoltaic module and improving its photoelectric conversion efficiency.

[0054] The material of the second cover plate 102 can be one of rigid materials such as tempered glass, PET (polyethylene terephthalate), or PC (polycarbonate). Alternatively, the material of the second cover plate 102 can be one of flexible materials such as PVF (polyvinyl fluoride), ETFE (ethylene-tetrafluoroethylene copolymer), or PVDF (polyvinylidene fluoride).

[0055] The materials of the first cover plate 101 and the second cover plate 102 can be the same or different.

[0056] like Figure 22 As shown, the encapsulation layer 20 includes a first adhesive film 201 and a second adhesive film 202. In the third direction Z, a portion of the structure of the first adhesive film 201 is located between the battery layer 30 and the first cover plate 101, and a portion of the structure of the second adhesive film 202 is located between the battery layer and the second cover plate 102.

[0057] The first encapsulant film 201 is made of one of the following polyolefins: EVA (Ethylene-Vinyl Acetate Copolymer), POE (Polyolefin Elastomer), or PVB (Polyvinyl Butyral). These materials have high light transmittance, which is beneficial for improving the photoelectric conversion efficiency of photovoltaic modules. The first encapsulant film 201 can also be an EPE film (EVA-POE-EVA co-extrusion structure) or an EP film (EVA-POE co-extrusion structure).

[0058] The material of the second film 202 is one of polyolefins such as EVA (Ethylene-Vinyl Acetate Copolymer), POE (Polyolefin Elastomer), and PVB (Polyvinyl Butyral). The second film 202 can also be an EPE film (EVA-POE-EVA co-extrusion structure) or an EP film (EVA-POE co-extrusion structure).

[0059] The materials of the first adhesive film 201 and the second adhesive film 202 can be the same or different.

[0060] Figure 2 This is a partial structural diagram of the battery layer in some embodiments. For example... Figure 2 As shown, the battery layer 30 includes a plurality of battery cells 301. In the first direction X, adjacent battery cells 301 are electrically connected by a wire bonding strip 302 to form a battery string 303. The thickness direction of the battery cells 301 is parallel to the aforementioned third direction Z.

[0061] Figure 3 This is a top view of the battery layer in some embodiments. (e.g.) Figure 3 As shown, in the first direction X and / or the second direction Y, adjacent battery strings 303 are electrically connected by a busbar 304. The busbar 304 is used to realize the series or parallel connection between adjacent battery strings 303. The thickness direction of the battery string 303 is parallel to the aforementioned third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0062] In the first direction X, the spacing between adjacent battery cells 301 is -1mm to 2mm. For example, the spacing between adjacent battery cells 301 can be -1mm, -0.5mm, 0mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.

[0063] For example, the interval between adjacent cell pieces is -1mm to 0mm, and the interval between adjacent cell pieces can be -1mm, -0.9mm, -0.8mm, -0.7mm, -0.6mm, -0.5mm, -0.4mm, -0.3mm, -0.2mm, -0.1mm, 0mm, and the like.

[0064] For example, the interval between adjacent cell pieces is 0mm to 2mm, and the interval between adjacent cell pieces can be 0mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, and the like.

[0065] In the first direction X, the interval between adjacent cell pieces 301 is -0.3mm to 2mm, and for example, the interval between adjacent cell pieces 301 can be -0.3mm, -0.2mm, -0.1mm, 0mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, and the like.

[0066] In this embodiment, the interval between adjacent cell pieces 301 is -0.3mm to 2mm, which can reduce the area of the blank area on the photovoltaic module, the blank area refers to the area where the cell piece is not arranged and cannot perform photoelectric conversion, reducing the area of the blank area can improve the proportion of the light emitting area of the photovoltaic module, thereby improving the output power per unit area of the photovoltaic module and improving the performance of the photovoltaic module.

[0067] For example, the interval between adjacent cell pieces is -0.3mm to 0mm, and the interval between adjacent cell pieces can be -0.3mm, -0.29mm, -0.28mm, -0.27mm, -0.26mm, -0.25mm, -0.24mm, -0.23mm, -0.22mm, -0.21mm, -0.2mm, -0.19mm, -0.18mm, -0.17mm, -0.16mm, -0.15mm, -0.14mm, -0.13mm, -0.12mm, -0.11mm, -0.1mm, -0.09mm, -0.08mm, -0.07mm, -0.06mm, -0.05mm, -0.04mm, -0.03mm, -0.02mm, -0.01mm, 0mm, and the like.

[0068] For example, the interval between adjacent cell pieces is 0mm to 1mm, and the interval between adjacent cell pieces can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and the like.

[0069] For example, the spacing between adjacent battery pieces is 1mm-2mm. The spacing between adjacent battery pieces can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0070] In the first direction X, the spacing between adjacent battery strings 303 is 0.3mm-6mm. For example, the spacing between adjacent battery strings 303 can be 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, etc.

[0071] For example, the spacing between adjacent battery strings is 0.3mm-2mm. The spacing between adjacent battery strings 303 can be 0.3mm, 0.5mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0072] For example, the spacing between adjacent battery strings is 0.3mm-1mm. The spacing between adjacent battery strings 303 can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.

[0073] For example, the spacing between adjacent battery strings is 1mm-2mm. The spacing between adjacent battery strings 303 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0074] For example, the spacing between adjacent battery strings is 2mm-4mm. The spacing between adjacent battery strings can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, etc.

[0075] For example, the spacing between adjacent battery strings is 4mm-6mm. The spacing between adjacent battery strings can be 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, etc.

[0076] The types of battery pieces include, but are not limited to, a passivated emitter rear contact (PERC) cell, a tunnel oxide passivated contact (TOPCon) cell, a heterojunction with intrinsic thin-film (HJT) cell, a perovskite cell, and the like.

[0077] For a PERC cell, along its thickness direction, the PERC cell includes, in sequence, a front surface metal silver electrode, a front surface silicon nitride passivation layer, a phosphorus layer emitter, a P-type base silicon layer, a local aluminum back field, a metal aluminum back electrode, and a back passivation layer (Al2O3 / WiNx). The PERC cell uses a passivation film to passivate the back surface, replaces the full aluminum back field, enhances the internal back reflection of light on the silicon base, reduces the recombination rate of the back surface, and improves the efficiency of the cell by 0.5%-1%.

[0078] For a TOPCon cell, along its thickness direction, the TOPCon cell includes, in sequence, a metal silver electrode, a front surface silicon nitride passivation layer, a boron-doped emitter, an N-type base silicon layer, a diffusion-doped layer, an ultrathin silicon oxide, a doped polysilicon, silicon nitride, and a metal silver electrode. The back surface of the cell is composed of an ultrathin silicon oxide layer (1 nm-2 nm) and a phosphorus-doped microcrystalline-amorphous mixed Wi thin film, which together form a passivated contact structure. This structure can block the recombination of minority carriers, improve the open-circuit voltage and short-circuit current of the cell. The ultrathin oxide layer allows the tunneling of majority carriers into the polysilicon layer while blocking the recombination of minority carriers. The good passivation effect of the ultrathin silicon oxide and the heavily doped silicon thin film causes the energy band of the silicon wafer surface to bend, thereby forming a field passivation effect. The probability of electron tunneling increases significantly, the contact resistance decreases, and the open-circuit voltage and short-circuit current of the cell are improved, thereby improving the conversion efficiency of the cell.

[0079] For a HJT cell, along its thickness direction, the HJT cell includes, in sequence, a front low-temperature silver electrode, a front conductive thin film, an N-type amorphous silicon thin film, an intrinsic amorphous silicon thin film, an N-type base silicon layer, an intrinsic amorphous silicon thin film, a P-type amorphous silicon thin film, a back conductive thin film, and a back low-temperature silver electrode.

[0080] For a perovskite cell, along its thickness direction, the perovskite cell includes, in sequence, a substrate material, a conductive thin film, an electron transport layer (titanium dioxide), a perovskite absorption layer (hole transport layer), and a metal cathode. Perovskite material has a high light absorption coefficient and a long carrier diffusion distance. After the absorbed photons are converted into electrons, they are easily collected by the electrode and have less loss, thus generating a high photovoltage and current, which makes perovskite exhibit high photoelectric conversion efficiency.

[0081] The following are detailed discussions on the specific structure of the battery piece taking the battery piece as a TOPCon battery as an example.

[0082] Figure 4 is an enlarged view of part A in Figure 3 . As shown in Figure 3 and Figure 4 , in the first direction X, the busbar 304 includes a busbar 1 located at the outermost edge of the battery layer, that is, the battery layer is provided with a busbar 1 on one side or both sides in the first direction X, and the string welding band 302 includes an edge welding band 3 located at the outermost edge of the battery layer, one end of the edge welding band 3 is electrically connected with the battery piece 301 at the outermost edge, and the other end of the edge welding band 3 extends outward and is electrically connected with the busbar 1.

[0083] When the battery piece 301 is a TOPCon battery, the light-receiving surface and the back surface of the battery piece 301 are both connected with the string welding band 302.

[0084] Figure 5 is an enlarged view of part B in Figure 3 . As shown in Figure 3 and Figure 5 , in the first direction X, the busbar 304 includes an interconnection strip 2 located between adjacent battery strings 303, and the string welding band 302 includes an electrical connection piece 4, both ends of the electrical connection piece 4 are electrically connected with the battery piece 301 on the adjacent battery strings 303, so that the adjacent battery strings 303 are connected in series or parallel to form a battery string group 305, and a plurality of battery string groups 305 are arranged along the second direction Y, in the second direction Y, at least two battery string groups 305 are electrically connected with the same interconnection strip 2, so that the adjacent battery string groups 305 are connected in series or parallel.

[0085] The cross-sectional shape of the string welding band 302 can be circular or rectangular.

[0086] When the cross-sectional shape of the string welding band 302 is circular, the string welding band 302 is a circular welding band, and the diameter of the string welding band 302 is 0.2mm~0.35mm, and exemplarily, the diameter of the string welding band 302 can be 0.2mm, 0.21mm, 0.23mm, 0.25mm, 0.27mm, 0.29mm, 0.3mm, 0.31mm, 0.35mm, etc.

[0087] Exemplarily, the diameter of the string welding band 302 is 0.2mm~0.3mm, and the diameter of the string welding band 302 can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, etc.

[0088] For example, the diameter of the wire strip 302 is 0.3mm to 0.35mm, and the diameter of the wire strip 302 can be 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, etc.

[0089] Will Figure 4 The side where the busbar 1 is located is designated as the edge region of the battery layer 30. Figure 5 The side where the interconnecting strip 2 is located is designated as the middle region of the battery layer 30. The connection structure of the edge region and the middle region will be discussed below.

[0090] First, the connection structure of the edge region will be discussed in detail.

[0091] Figure 6 This is a cross-sectional view of the connection structure between the busbar and the battery string in related technologies. (Example) Figure 6 As shown, the busbar 1 in the related technology is referred to as the first busbar 11. The first busbar 11 and the adjacent battery cell 301 have a first gap 111 in the first direction X. The first gap 111 results in a large arrangement space for the first busbar 11 and the battery string 303. In order to meet the arrangement space of the first busbar 11 in a limited space, the number of battery strings 303 needs to be sacrificed, which affects the output power of the photovoltaic module.

[0092] Therefore, in order to reduce the arrangement space of busbar 1 and battery string 303, Figure 7 The connection structure between the busbar and the battery string provided in the embodiments of this application is shown in cross-sectional views in some embodiments. For example... Figure 7 As shown, the busbar 1 in this embodiment is referred to as the second busbar 12. The busbar 304 also includes a connecting portion 13. In the third direction Z, the connecting portion 13 is located on the side of the second busbar 12 facing the battery cell 301. The second busbar 12 and the edge solder strip 3 are electrically connected through the connecting portion 13, so that adjacent battery strings are electrically connected through the second busbar 12. The second busbar 12 is located on the back surface of the battery string, that is, in the third direction Z, a part of the structure of the second busbar 12 is located on the back surface of the battery cell 301, so that the projection of the second busbar in the third direction Z overlaps with the projection of the battery cell in the third direction Z.

[0093] In this embodiment, the second busbar 12 is located on the back surface of the solar cell 301, so that a part of the structure of the second busbar 12 is blocked by the solar cell 301. Without adjusting the size of the solar cell 301 and the second busbar 12 in the first direction X, the total size of the second busbar 12 and the solar cell string 303 in the first direction X can be reduced, thereby reducing the arrangement space of the second busbar 12 and the solar cell string 303, so as to arrange more solar cells 301 in a limited space, thereby increasing the screen ratio of the photovoltaic module and improving the output power of the photovoltaic module.

[0094] based on Figure 6 According to the related technology shown, if the first busbar 11 is to be placed on the backlight surface of the battery cell, the first busbar 11 needs to be folded, and the structure after folding is as follows: Figure 8 As shown, at this time, a portion of the edge solder strip 3 is folded onto the back surface of the battery cell 301 along with the first busbar 11. At the first busbar 11, the total thickness of the battery layer 30 is the thickness of the edge solder strip 3 on the light-facing side, the thickness of the battery cell 301, the thickness of the first busbar 11, and the thickness of the edge solder strip 3 on the back surface. This results in a localized increase in the thickness of the battery layer 30, which increases the risk of microcracks during subsequent lamination. Simultaneously, the folding of the edge solder strip 3 can lead to breakage and damage, also increasing the risk of solder joint cracking.

[0095] Therefore, as Figure 7 As shown, in this embodiment, the second busbar 12 and the edge solder strip 3 are electrically connected by a connecting portion 13 extending along the third direction Z, which reduces the risk of the edge solder strip 3 bending and breaking, and the risk of solder joint cracking. It also reduces the risk of local increase in the thickness of the battery layer 30 leading to hidden cracks in the lamination process, thereby improving the processing yield and working stability of the photovoltaic module.

[0096] The second busbar 12 and the connecting part 13 can be integrally formed to simplify the connection and shorten the connection cycle.

[0097] Alternatively, the second busbar 12 and the connecting part 13 can be separate structures, and the second busbar 12 and the connecting part 13 can be fixedly connected by welding or hot pressing to reduce the processing difficulty of the second busbar 12 and the connecting part 13 and shorten the processing cycle. In this case, the connecting part 13 can be a welding strip, and the cross-sectional shape of the connecting part 13 can be circular or rectangular, that is, the connecting part 13 can be a round welding strip or a flat welding strip.

[0098] The connecting part 13 and the edge welding strip 3 are fixedly connected by welding or hot pressing to reduce the processing difficulty of the connecting part 13 and the edge welding strip 3 and shorten the processing cycle.

[0099] like Figure 7As shown, the second busbar 12 includes a first edge 121 and a second edge 122 arranged along a first direction X. In the first direction X, the first edge 121 is located on the side of the second busbar 12 facing the battery string 305, and the second edge 122 is located on the side of the second busbar 12 away from the battery string 305. In the third direction Z, the edge of the connecting portion 13 is aligned with the second edge 122.

[0100] In this embodiment, the outer edge of the connecting portion 13 is aligned with the outer edge of the second busbar 12, leaving a gap between the connecting portion 13 and the solar cell 301 in the first direction X. This reduces the risk of short circuit in the solar cell 301 due to direct contact between the connecting portion 13 and the solar cell 301. Furthermore, aligning the outer edge of the connecting portion 13 with the outer edge of the second busbar 12, while maintaining the gap between the connecting portion 13 and the solar cell 301 in the first direction X, allows for a reduction in the overall size of the connecting portion 13, the second busbar 12, and the solar cell string 303 in the first direction X. This facilitates increasing the size of the solar cell 301 within a limited space, thereby enhancing the output power of the photovoltaic module.

[0101] like Figure 7 As shown, in the first direction X, the width of the second busbar 12 is H1, and the width of the connecting part 13 is H2, where 1.3 < H1 / H2 ≤ 75. For example, H1 / H2 can be equal to 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, etc.

[0102] If the value of H1 / H2 is small, the width difference between the second busbar 12 and the connecting part 13 is small, and the risk of the connecting part 13 contacting the battery cell 301 and causing the battery cell 301 to short circuit is high.

[0103] If the ratio of H1 / H2 is large, the width of the second busbar 12 will be large, resulting in a higher material cost for the second busbar 12. Alternatively, if the width of the connecting part 13 is small, the current transmission capacity of the connecting part 13 will be poor, which will also result in poor connection stability between the connecting part 13 and the edge solder strip 3.

[0104] Therefore, in the embodiment, 1.3 < H1 / H2≤75, the width difference between the second bus bar 12 and the connecting portion 13 can be increased, so as to reduce the risk that the connecting portion 13 contacts the battery piece 301 and causes the battery piece 301 to be short-circuited, meanwhile, the width of the second bus bar 12 can be reduced, the material cost of the second bus bar 12 is relatively high, the width of the connecting portion 13 can be increased, so as to improve the current transmission capacity of the connecting portion 13 and the connection stability between the connecting portion 13 and the edge solder strip 3, and further improve the output power and working stability of the photovoltaic module.

[0105] For example, 1.3 < H1 / H2≤1.7, H1 / H2 can be equal to 1.31, 1.33, 1.35, 1.37, 1.39, 1.4, 1.41, 1.43, 1.45, 1.47, 1.49, 1.5, 1.51, 1.53, 1.55, 1.57, 1.59, 1.6, 1.61, 1.63, 1.65, 1.67, 1.69, 1.7, etc.

[0106] For example, 1.7≤H1 / H2≤10.7, H1 / H2 can be equal to 1.7, 1.71, 1.75, 2, 2.5, 2.7, 3, 3.5, 3.7, 4, 4.5, 4.7, 5, 5.5, 5.7, 6, 6.5, 6.7, 7, 7.5, 7.7, 8, 8.5, 8.7, 9, 9.5, 9.7, 10, 10.5, 10.7, etc.

[0107] For example, 10.7≤H1 / H2≤16.7, H1 / H2 can be equal to 10.7, 10.71, 10.75, 11, 11.3, 11.5, 11.7, 11.9, 12, 12.1, 12.3, 12.5, 12.7, 12.9, 13, 13.1, 13.3, 13.5, 13.7, 13.9, 14, 14.1, 14.3, 14.5, 14.7, 14.9, 15, 15.1, 15.3, 15.5, 15.7, 15.9, 16, 16.1, 16.3, 16.5, 16.6, 16.69, etc.

[0108] For example, 1.3 < H1 / H2 < 16.7, H1 / H2 can be equal to 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6, etc.

[0109] For example, 16.7≤H1 / H2≤20, H1 / H2 can be equal to 16.7, 16.8, 16.9, 17, 17.2, 17.4, 17.6, 17.8, 18, 18.2, 18.4, 18.6, 18.8, 19, 19.2, 19.4, 19.6, 19.8, 20, etc.

[0110] For example, 20≤H1 / H2≤55, H1 / H2 can be equal to 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, etc.

[0111] For example, 55≤H1 / H2≤75, H1 / H2 can be equal to 55, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 75, etc.

[0112] The width H1 of the second bus bar 12 satisfies: 4mm≤H1≤15mm, for example, H1 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0113] For example, 4mm≤H1≤7mm, H1 can be 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, etc.

[0114] For example, 7mm≤H1≤10mm, H1 can be 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, etc.

[0115] For example, 4mm≤H1≤10mm, H1 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0116] For example, 10mm≤H1≤15mm, H1 can be 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm, 15mm, etc.

[0117] The width H2 of the connecting portion 13 satisfies 0.2mm≤H2≤3mm, and H2 can be 0.2mm, 0.4mm, 0.6mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0118] For example, 0.2mm≤H2≤0.6mm, and H2 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, etc.

[0119] For example, 0.6mm≤H2≤1mm, and H2 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

[0120] For example, 1mm≤H2≤3mm, and H2 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc.

[0121] In the first direction X, the distance between the connecting portion 13 and the edge of the battery sheet 301 is greater than 0, and the distance between the connecting portion 13 and the edge of the battery sheet 301 is less than or equal to 1.5mm, and for example, in the first direction X, the distance between the connecting portion 13 and the edge of the battery sheet 301 can be 0.01mm, 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, etc.

[0122] In this embodiment, if the distance between the connecting portion 13 and the edge of the battery sheet 301 is large, the area of the blank area of the photovoltaic module is large, which will affect the output power of the photovoltaic module.

[0123] Therefore, the distance between the connecting portion 13 and the edge of the battery sheet 301 is greater than 0, and the distance between the connecting portion 13 and the edge of the battery sheet 301 is less than or equal to 1.5mm, which reduces the risk of the battery sheet 301 being short-circuited by the connecting portion 13 due to the contact between the connecting portion 13 and the battery sheet 301, and also reduces the area ratio of the blank area on the photovoltaic module, thereby improving the output power of the photovoltaic module.

[0124] For example, the distance between the connecting portion 13 and the edge of the battery cell 301 is greater than 0, and the distance between the connecting portion 13 and the edge of the battery cell 301 is less than or equal to 0.4 mm. In the first direction X, the distance between the connecting portion 13 and the edge of the battery cell 301 can be 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4 mm, etc.

[0125] For example, the distance between the connecting portion 13 and the edge of the battery cell 301 is between 0.4 mm and 1.5 mm. In the first direction X, the distance between the connecting portion 13 and the edge of the battery cell 301 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0126] In the second direction Y, the length of the connecting part 13 can be equal to the length of the second busbar 12, that is, the end of the connecting part 13 is aligned with the end of the second busbar 12.

[0127] or, Figure 9 This is a top view of the connection structure between the second busbar 12 and the connecting part 13 in the third direction Z. Figure 9 As shown, the length of the connecting portion 13 is less than the length of the second busbar 12, reducing the risk of the connecting portion 13 protruding from the second busbar 12 in the second direction Y. At this time, a gap needs to be left between the end of the connecting portion 13 and the end of the second busbar 12 in the second direction Y, and the size of the gap in the second direction Y is H3.

[0128] When the second busbar 12 is bent out along the third direction Z and welded to the junction box, 20mm≤H3≤50mm. For example, H3 can be 20mm, 30mm, 40mm, 50mm, etc.

[0129] In this embodiment, if H3 is small, the bending dimension of the reserved second busbar 12 is small, increasing the difficulty of connecting the second busbar 12 to the junction box. If H3 is large, the material cost of the second busbar 12 is high. Therefore, 20mm≤H3≤50mm can reduce the difficulty of connecting the second busbar 12 to the junction box and also reduce the material cost of the second busbar 12.

[0130] For example, 20mm≤H3≤35mm, and H3 can be 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, etc.

[0131] For example, 35mm≤H3≤50mm, and H3 can be 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc.

[0132] When the second bus bar 12 does not need to be welded with the junction box, 0mm≤H3≤5mm, and for example, H3 can be 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc.

[0133] In the present embodiment, if H3 is larger, the material cost of the second bus bar 12 is higher. Therefore, 0mm≤H3≤5mm, which can reduce the material cost of the second bus bar 12.

[0134] For example, 0mm≤H3≤2.5mm, and H3 can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0135] For example, 2.5mm≤H3≤5mm, and H3 can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0136] Figure 10 A top view of the connection structure of the connection part 13 and the edge solder strip 3 in the third direction. As shown in FIG. 6, the edge solder strip 3 includes a first body 31 and a second body 32 arranged along the first direction X, and the first body 31 and the second body 32 are connected by a connecting part 33. Figure 10 As shown in FIG. 6, the edge solder strip 3 includes a first body 31 and a second body 32 arranged along the first direction X, and the first body 31 and the second body 32 are connected by a connecting part 33. Figure 7The battery piece 301 in the second body 32 is electrically connected, and the second body 32 is electrically connected with the connecting part 13. In the second direction Y, the width of the second body 32 is greater than the width of the first body 31, so that the second body 32 has a greater contact area with the connecting part 13, thereby improving the connection stability of the second body 32 and the connecting part 13, and further improving the working stability of the photovoltaic module. It can also reduce the contact resistance between the second body 32 and the connecting part 13, thereby improving the output power of the photovoltaic module.

[0137] In the third direction Z, the thickness of the first body 31 and the second body 32 can be the same or different.

[0138] Figure 11 The local structure of the edge solder strip is shown in the schematic view. As shown in Figure 11 In the third direction Z, the thickness of the second body 32 is less than the thickness of the first body 31. In the processing process, the end of the edge solder strip 3 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing cost of the edge solder strip 3, and facilitating the shortening of the processing cycle of the edge solder strip 3.

[0139] In the third direction Z, the thickness of the second body 32 is less than the thickness of the first body 31. In the processing process, the end of the edge solder strip 3 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing cost of the edge solder strip 3, and facilitating the shortening of the processing cycle of the edge solder strip 3.

[0140] If the thickness of the second body 32 is small, the structural strength of the second body 32 is poor. If the thickness of the second body 32 is large, the contact area between the second body 32 and the connecting part 13 is small. Therefore, in the present embodiment, the thickness of the second body 32 in the third direction Z is 0.1mm~0.15mm, which can improve the structural strength of the second body 32, and also increase the contact area between the second body 32 and the connecting part 13, thereby improving the working stability of the photovoltaic module.

[0141] In the third direction Z, the thickness of the second body 32 is less than the thickness of the first body 31. In the processing process, the end of the edge solder strip 3 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing cost of the edge solder strip 3, and facilitating the shortening of the processing cycle of the edge solder strip 3.

[0142] In the third direction Z, the thickness of the second body 32 is less than the thickness of the first body 31. In the processing process, the end of the edge solder strip 3 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing cost of the edge solder strip 3, and facilitating the shortening of the processing cycle of the edge solder strip 3.

[0143] Figure 12This is a cross-sectional view of the connection structure between the second busbar and the battery string in some other embodiments. For example... Figure 12 As shown, the photovoltaic module also includes an insulating strip 5. In the third direction Z, the insulating strip 5 is located between the second busbar 12 and the cell 301. That is, the back surface of the cell 301 and the second busbar 12, and the string bonding strip 302 on the back surface and the second busbar 12 are insulated by the insulating strip 5, which reduces the risk of the cell 301 being short-circuited by the insulating strip 5 due to contact between the second busbar 12 and the cell 301, thereby improving the working stability of the cell 301 and the photovoltaic module.

[0144] like Figure 12 As shown, in the first direction X, the insulating strip 5 extends toward the outside of the cell 301 in the direction toward the connecting part 13. That is, the insulating strip 5 protrudes from the edge of the cell 301 in the first direction X, which further reduces the risk of short circuit of the cell 301 caused by the second busbar 12 contacting the cell 301, and further improves the working stability of the cell 301 and the photovoltaic module.

[0145] like Figure 12 As shown, in the first direction X, the insulating strip 5 contacts the connecting part 13, thereby improving the insulation effect of the insulating strip 5.

[0146] Alternatively, in the first direction X, a gap is left between the insulating strip 5 and the connecting part 13 to reduce the risk of installation difficulties caused by interference between the connecting part 13 and the insulating strip 5, thereby reducing the difficulty of installation.

[0147] Figure 13 This is a cross-sectional view of the insulating strip. (For example...) Figure 13 As shown, the insulating strip 5 includes at least a first layer 51, a second layer 52 and a third layer 53. In the third direction Z, the second layer 52 is located between the first layer 51 and the third layer 53.

[0148] For example, the first layer 51 can be EVA, or it can be an EVA-POE-EVA three-layer co-extruded structure, or it can be PO (Polyolefin).

[0149] For example, the material of the second layer 52 is PET.

[0150] For example, the third layer 53 can be EVA, PO (Polyolefin), or an EVA-POE-EVA three-layer co-extrusion structure.

[0151] In the second direction Y, there is one insulating strip 5. Figure 14 This is a bottom view of the connection structure between the insulating strip and the edge region of the battery cell in some embodiments. The bottom view refers to the diagram obtained by looking at the battery cell from the backside of the cell. For example... Figure 14As shown, in the second direction Y, all the battery pieces 301 arranged along the second direction Y at the edge region are connected with the same insulation strip 5.

[0152] In the second direction Y, the number of insulation strips 5 is multiple. Figure 15 For the connection structure of the insulation strip and the battery piece at the edge region in another embodiment, a lower view is shown as follows. Figure 15 As shown, in the second direction Y, the number of insulation strips 5 is multiple, and one insulation strip 5 is connected with at least two battery string groups, that is, at least two battery pieces 301 arranged along the second direction Y at the edge region are connected with the same insulation strip 5.

[0153] In the second direction Y, the number of insulation strips 5 is multiple. Figure 16 For the connection structure of the insulation strip and the battery piece at the edge region in another embodiment, a lower view is shown as follows. Figure 16 As shown, in the second direction Y, the number of insulation strips 5 is multiple, and one insulation strip 5 is connected with at least two battery string groups, that is, at least two battery pieces 301 arranged along the second direction Y at the edge region are connected with the same insulation strip 5.

[0154] The thickness of the insulation strip 5 in the third direction Z is 0.1mm~0.8mm, and the thickness of the insulation strip 5 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

[0155] The thickness of the insulation strip 5 in the third direction Z is 0.1mm~0.5mm, and the thickness of the insulation strip 5 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc.

[0156] The thickness of the insulation strip 5 in the third direction Z is 0.5mm~0.8mm, and the thickness of the insulation strip 5 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc.

[0157] In the first direction X, the width of the insulation strip 5 is 6mm~30mm, and the width of the insulation strip 5 can be 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc.

[0158] The width of the insulation strip 5 is 6mm~10mm, and the width of the insulation strip 5 can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0159] For example, the width of the insulating strip 5 is 10mm~20mm, and the width of the insulating strip 5 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0160] For example, the width of the insulating strip 5 is 20mm~30mm, and the width of the insulating strip 5 can be 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc.

[0161] Based on the above structure, the edge solder strip 3 is located on the light-facing side of the solar cell 301, or the edge solder strip 3 is located on the back-light-facing side of the solar cell 301.

[0162] Figure 17 This is a cross-sectional view of the connection structure between the second busbar and the battery string in one embodiment. Figure 17 As shown, when the second busbar 12 is located on the back surface of the battery cell 301 and the edge solder strip 3 is located on the light-facing surface of the battery cell 301, in the third direction Z, the distance between the light-facing surface of the first body 31 and the back surface of the battery cell 301 is L1, the distance between the light-facing surface of the second busbar 12 and the back surface of the battery cell 301 is L2, and the thickness of the connecting part 13 is L3, where L2≤L3<L1, or L2<L3≤L1, so that the connecting part 13 can be connected to the edge solder strip 3 on the light-facing surface. At the same time, it reduces the risk of the connecting part 13 being too high and lifting the edge solder strip 3 to form a local protrusion, thereby reducing the risk of damage to the laminate at the local protrusion during the lamination process.

[0163] Figure 18 This is a cross-sectional view of the connection structure between the second busbar and the battery string in another embodiment. (See diagram below.) Figure 18 As shown, when the second busbar 12 is located on the back surface of the battery cell 301 and the edge solder strip 3 is located on the back surface of the battery cell 301, in the third direction Z, the distance between the light-facing surface of the first body 31 and the light-facing surface of the second busbar 12 is L4, the distance between the back surface of the first body 31 and the light-facing surface of the second busbar 12 is L5, and the thickness of the connecting part 13 is L6, where L5≤L6<L4, or L5<L6≤L4, so that the connecting part 13 can be connected to the edge solder strip 3 on the back surface. At the same time, it reduces the risk of the connecting part 13 being too high and lifting the edge solder strip 3 to form a local protrusion, thereby reducing the risk of damage to the laminate at the local protrusion during the lamination process.

[0164] In the third direction Z, the thickness of the second bus bar 12 is 0.05mm-0.4mm, and for example, the thickness of the second bus bar 12 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc.

[0165] For example, the thickness of the second bus bar 12 is 0.05mm-0.1mm, and the thickness of the second bus bar 12 can be 0.05mm, 0.055mm, 0.06mm, 0.065mm, 0.07mm, 0.075mm, 0.08mm, 0.085mm, 0.09mm, 0.095mm, 0.1mm, etc.

[0166] For example, the thickness of the second bus bar 12 is 0.1mm-0.2mm, and the thickness of the second bus bar 12 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc.

[0167] For example, the thickness of the second bus bar 12 is 0.2mm-0.4mm, and the thickness of the second bus bar 12 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc.

[0168] In the third direction Z, the thickness of the connection part 13 is 0.2mm-0.6mm, and for example, the thickness of the connection part 13 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, etc.

[0169] For example, the thickness of the connection part 13 is 0.2mm-0.4mm, and the thickness of the connection part 13 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc.

[0170] For example, the thickness of the connection part 13 is 0.4mm-0.6mm, and the thickness of the connection part 13 can be 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm, 0.6mm, etc.

[0171] Based on the above structure of the edge area, the second aspect of the embodiment of the application provides a manufacturing method of a photovoltaic module, Figure 19Flow chart of the manufacturing method of the photovoltaic module in some embodiments. As shown in Figure 19 the manufacturing method of the photovoltaic module includes: A1: preparing the cell string group 305.

[0172] A2: arranging the plurality of cell string groups 305 along the second direction Y.

[0173] A3: placing the connecting part 13 on one side or both sides of the cell string group 305 in the first direction X, the connecting part 13 extending along the second direction Y, and the connecting part 13 being located on the back light surface of the cell string group 305 in the third direction Z.

[0174] A4: welding and fixing the connecting part 13 and the string ribbon 302 on the cell string group 305.

[0175] A5: laying the encapsulation layer 20 and the cover plate 10 on the light surface and the back light surface of the cell string group 305, laminating and fixing to form a laminated part.

[0176] A6: installing the frame on the edge of the laminated part to form the photovoltaic module.

[0177] Before or after step A3, the manufacturing method of the photovoltaic module further includes: A7: welding and fixing the connecting part 13 on the second bus bar 12.

[0178] In the present embodiment, the second bus bar 12 is located on the back light surface of the cell sheet 301, so that part of the structure of the second bus bar 12 is shielded by the cell sheet 301. Without adjusting the size of the cell sheet 301 and the second bus bar 12 in the first direction X, the total size of the second bus bar 12 and the cell string 303 in the first direction X can be reduced, thereby reducing the arrangement space of the second bus bar 12 and the cell string 303, so as to arrange more cell sheets 301 in the limited space, thereby improving the screen ratio of the photovoltaic module and improving the output power of the photovoltaic module.

[0179] Figure 19 It is shown that step A7 is after step A4 and before step A5.

[0180] Figure 20 Flow chart of the manufacturing method of the photovoltaic module in some embodiments, Figure 20 It is shown that step A7 is before step A3.

[0181] Figure 21 Flow chart of part of the manufacturing method of the photovoltaic module in some embodiments, as shown in Figure 21 Before step A1, the manufacturing method of the photovoltaic module further includes: A01: flattening the end of the edge ribbon 3 to form the second body 32.

[0182] Based on step A01, step A4 comprises: A41: welding and fixing the connecting part 13 with the second body 32.

[0183] In the present embodiment, the end of the edge solder strip 3 is flattened to form the second body 32, so that the second body 32 has a larger contact area with the connecting part 13, thereby improving the connection stability of the second body 32 with the connecting part 13, and further improving the working stability of the photovoltaic module.

[0184] Figure 22 The structure of the battery string group in some embodiments is shown in FIG. 3. As shown in FIG. 3, the string solder strip 302 at one end of the battery string 303 extends to the outside of the battery piece 301, and the string solder strip 302 of the adjacent battery string 303 can be directly welded and fixed. Figure 22 Based on the structure shown in FIG. 3,

[0185] the flowchart of step A1 in some embodiments is shown in FIG. 4. As shown in FIG. 4, step A1 comprises: Figure 22 Figure 23 A11: arranging a plurality of battery pieces 301 along a first direction X. Figure 23 A12: placing a string solder strip 302 on the battery piece 301 and welding and fixing to form a battery string 303.

[0186] A13: arranging at least two battery strings 303 along the first direction X.

[0187] A14: welding and fixing the string solder strips 302 of adjacent battery strings 303 to form a battery string group 305.

[0188]

[0189] Wherein, in the third direction Z, the projection of the string solder strip 302 of the adjacent battery string 303 can have an overlapping part or can not have an overlapping part.

[0190] Figure 24 The structure of the battery string group in some embodiments is shown in FIG. 3. As shown in FIG. 3, the string solder strip 302 comprises a first solder strip 3021 and a second solder strip 3022, and in one battery string 303, the first solder strip 3021 is used to connect adjacent battery pieces 301, and the second solder strip 3022 is used to connect adjacent battery strings 303. Figure 3 Based on the structure shown in FIG. 3,

[0191] the flowchart of step A1 in some embodiments is shown in FIG. 4. As shown in FIG. 4, step A1 comprises: Figure 24 Figure 25 A11: arranging a plurality of battery pieces 301 along a first direction X. Figure 25 ​​​​​A15: arranging a plurality of battery pieces 301 along a first direction X.

[0192] A16: placing a first solder strip 3021 on the battery piece 301 and welding and fixing to form a battery string 303.

[0193] A17: arranging at least two battery strings 303 along the first direction X.

[0194] A18: placing two ends of a second solder strip 3022 on adjacent battery strings 303 respectively in the first direction X and welding and fixing to form a battery string group 305.

[0195] When the back of the battery piece 301 is provided with an insulation strip 5, the insulation strip 5 can be fixed on the battery string 303 first, and then the battery string 303 is welded into the battery string group 305. Alternatively, the battery string 303 can be welded into the battery string group 305 first, and then the insulation strip 5 is fixed on the battery string group 305.

[0196] As shown in the flowchart of FIG. 8, Figure 25 Figure 26 is a connection flowchart of the insulation strip and the battery string group in some embodiments. As shown in FIG. 9, Figure 26 after step A16 and before step A17, the manufacturing method of the photovoltaic module further includes: A02: placing the insulation strip 5 on the battery string 303, and the insulation strip 5 is located on the back of the battery piece 301 in the third direction Z.

[0197] A03: fixing the insulation strip 5 and the battery string 303 by the spot pressing process.

[0198] As shown in the flowchart of FIG. 10, Figure 25 Figure 27 is a connection flowchart of the insulation strip and the battery string group in some other embodiments. As shown in FIG. 11, Figure 27 after step A1 and before step A4, the manufacturing method of the photovoltaic module further includes: A04: placing the insulation strip 5 on the battery string group 305, and the insulation strip 5 is located on the back of the battery piece 301 in the third direction Z; A05: fixing the insulation strip 5 and the battery string group 305 by the spot pressing process.

[0199] In addition, the insulation strip 5 can be first connected and fixed with the second bus bar 12, and then the insulation strip 5 is fixed on the battery string group by the spot pressing process. The application does not specially limit the fixing sequence of the insulation strip 5.

[0200] In the above steps A03 and A05, the specific steps of the spot pressing process can be: hot air blowing and pressing is performed on the insulation strip 5, so that the insulation strip 5 is fixed on the battery piece 301.​​

[0201] Alternatively, the specific steps of the spot ironing process can be: The insulating strip 5 is irradiated by an infrared lamp tube so that the insulating strip 5 is fixed on the battery piece 301.

[0202] The specific steps of the spot ironing process are not specially limited in the embodiments of the present application.

[0203] In summary, in the method for manufacturing the photovoltaic module provided in the embodiments of the present application, the connecting part 13 can be first fixed on the battery string group 305, and then the second bus bar 12 is connected and fixed with the connecting part 13. Alternatively, the connecting part 13 can be first connected and fixed with the second bus bar 12 to form an integral whole, and then the integral whole is fixed on the battery string group 305.

[0204] The insulating strip 5 can be first fixed on the battery string 303, and then the battery string 303 is connected to form the battery string group 305. Alternatively, the battery string 303 can be first connected to form the battery string group 305, and then the insulating strip 5 is fixed on the battery string group 305.

[0205] It should be noted that if the battery string 303 is first connected to form the battery string group 305, and then the connecting part 13, the second bus bar 12 and the insulating strip 5 are fixed on the battery string group 305, the following two steps exist: First, the insulating strip 5 is first fixed on the battery string group 305, and then the connecting part 13 and the second bus bar 12 are fixed on the battery string group.

[0206] Second, the connecting part 13, the second bus bar 12 and the insulating strip 5 are first connected to form an integral whole, and then the integral whole is fixed on the battery string group 305.

[0207] Next, the connection structure of the edge region is discussed in detail.

[0208] As shown in Figure 3 and Figure 5 In the first direction X, the bus member 304 includes the interconnecting strip 2 between the adjacent battery strings 303, the string ribbon 302 includes the electrical connecting member 4, and the two ends of the electrical connecting member 4 are respectively electrically connected with the battery pieces 301 on the adjacent battery strings 303, so that the adjacent battery strings 303 are connected in series or parallel to form a battery string group 305. A plurality of battery string groups 305 are arranged along the second direction Y, and in the second direction Y, at least two battery string groups 305 are electrically connected with the same interconnecting strip 2, so that the adjacent battery string groups 305 are connected in series or parallel.

[0209] Figure 28 is a sectional view of the connection structure of the interconnecting strip and the battery string in the related art. As shown in Figure 28As shown, the interconnecting strip 2 in the related art is referred to as a first interconnecting strip 21, and the first interconnecting strip 21 and the battery piece 301 adjacent thereto leave a larger second gap 211 in the first direction X. In the first direction X, the size of the second gap 211 needs to be larger than the size of the first interconnecting strip 21, so that the projection of the first interconnecting strip 21 is completely located within the second gap 211.

[0210] The above-mentioned second gap 211 results in a larger arrangement space of the first interconnecting strip 21 and the battery string 303. In order to meet the arrangement space of the first interconnecting strip 21, the number of battery strings 303 needs to be sacrificed in the limited space, which affects the output power of the photovoltaic module.

[0211] In view of this, in order to reduce the arrangement space of the interconnecting strip 2 and the battery string 303, Figure 29 The cross-sectional view of the connection structure of the interconnecting strip and the battery string provided by the embodiments of the present application is shown in some embodiments. As shown in Figure 29 As shown, the interconnecting strip 2 in the embodiments of the present application is referred to as a second interconnecting strip 22, and the current collector 304 further comprises an interconnecting part 23. In the third direction Z, the interconnecting part 23 is located on the side of the second interconnecting strip 22 facing the battery piece 301, and in the first direction X, at least part of the structure of the interconnecting part 23 is located between the adjacent two battery strings 303. The second interconnecting strip 22 is electrically connected with the electrical connection piece 4 through the interconnecting part 23, so that the adjacent battery strings 303 in the first direction X are electrically connected through the second interconnecting strip 22, and the adjacent battery string groups 305 in the second direction Y are electrically connected through the second interconnecting strip 22.

[0212] Among them, the second interconnecting strip 22 is located on the back light surface of the battery string group 305, that is, in the third direction Z, part of the structure of the second interconnecting strip 22 is located on the back light surface of the battery piece 301, so that the projection of the second interconnecting strip 22 in the third direction Z overlaps with the projection of the battery piece 301 in the third direction Z.

[0213] In the present embodiment, the second interconnecting strip 22 is located on the back light surface of the battery piece 301, so that part of the structure of the second interconnecting strip 22 is shielded by the battery piece 301. Without adjusting the size of the battery piece 301 and the second interconnecting strip 22 in the first direction X, the total size of the second interconnecting strip 22 and the battery string 303 in the first direction X can be reduced, thereby reducing the arrangement space of the second interconnecting strip 22 and the battery string 303, so as to arrange more battery pieces 301 in the limited space, thereby improving the screen ratio of the photovoltaic module and improving the output power of the photovoltaic module.

[0214] Based on Figure 28 As shown in the related art, if the first interconnecting strip 21 is to be arranged on the back light surface of the battery piece 301, the first interconnecting strip 21 needs to be folded, and the structure after folding is as shown in Figure 30As shown, at this time, a portion of the electrical connector 4 is folded onto the back surface of the battery cell 301 along with the first interconnect strip 21. At the first interconnect strip 21, the total thickness of the battery layer 30 is the thickness of the electrical connector 4 on the light-facing side, the thickness of the battery cell 301, the thickness of the first interconnect strip 21, and the thickness of the two layers of electrical connector 4 on the back surface. This results in a localized increase in the thickness of the battery layer 30, which increases the risk of microcracks during subsequent lamination. Simultaneously, the folding of the electrical connector 4 can lead to breakage and damage, and also increases the risk of solder joint cracking.

[0215] Therefore, as Figure 29 As shown, in this embodiment, the second interconnect strip 22 and the electrical connector 4 are electrically connected by an interconnect portion 23 extending along the third direction Z, which reduces the risk of the electrical connector 4 being bent and broken, or the solder joints cracking. It also reduces the risk of hidden cracks appearing in the lamination process due to the local increase in the thickness of the battery layer 30, thereby improving the processing yield and working stability of the photovoltaic module.

[0216] like Figure 7 As shown, in the first direction X, the distance of the edge solder strip 3 beyond the edge of the battery cell 301 is H0, 1mm≤H0≤5mm. For example, the distance of the edge solder strip 3 beyond the edge of the battery cell 301 is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0217] If the edge solder strip 3 extends a large distance beyond the edge of the cell 301, the size of the cell layer in the first direction X will be large, but the actual area of ​​the cell 301 will be small, affecting the output power of the photovoltaic module.

[0218] If the distance between the edge welding strip 3 and the edge of the battery cell 301 is small, the connection between the edge welding strip 3 and the connecting part 13 will be more difficult, and there is a risk that the connection size between the edge welding strip 3 and the connecting part 13 will be small and the connection stability will be poor.

[0219] Therefore, 1mm≤H0≤5mm can increase the proportion of the area of ​​the cell 301 in the total area of ​​the cell layer, and can also improve the connection stability between the edge solder strip 3 and the connection part 13, thereby improving the output power of the photovoltaic module.

[0220] For example, 1mm≤H0≤2.5mm, the distance of the edge welding strip 3 extending beyond the edge of the battery cell 301 is 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0221] For example, 2.5mm≤H0≤5mm, the distance of the edge welding strip 3 extending beyond the edge of the battery cell 301 is 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0222] The second interconnecting strip 22 and the interconnecting part 23 can be integrally formed to simplify the connection and shorten the connection cycle.

[0223] Alternatively, the second interconnecting strip 22 and the interconnecting part 23 can be separate structures, and the second interconnecting strip 22 and the interconnecting part 23 can be fixedly connected by welding or hot pressing to reduce the processing difficulty of the second interconnecting strip 22 and the interconnecting part 23 and shorten the processing cycle. In this case, the interconnecting part 23 can be a welding strip, and the cross-sectional shape of the interconnecting part 23 can be circular or rectangular, that is, the interconnecting part 23 can be a round welding strip or a flat welding strip.

[0224] The interconnecting part 23 and the electrical connector 4 are fixedly connected by welding or hot pressing to reduce the processing difficulty of the interconnecting part 23 and the electrical connector 4 and shorten the processing cycle.

[0225] like Figure 29 As shown, the battery string group 305 includes at least a first battery string 3031 and a second battery string 3032 arranged along the first direction X. The first battery string 3031 includes a first end battery piece 3011, and the second battery string 3032 includes a second end battery piece 3012. In the first direction X, the first end battery piece 3011 and the second end battery piece 3012 are adjacent to each other.

[0226] On the third-party direction Z, the projection of the second interconnecting strip 22 overlaps with the projection of the first end battery cell 3011, and / or, the projection of the second interconnecting strip 22 overlaps with the projection of the second end battery cell 3012.

[0227] For example, on the third-party direction Z, the projection of the second interconnecting strip 22 overlaps with the projection of the first end battery cell 3011, while the projection of the second interconnecting strip 22 does not overlap with the projection of the second end battery cell 3012.

[0228] For example, on the third-party direction Z, the projection of the second interconnecting strip 22 and the projection of the first end battery cell 3011 do not overlap, while the projection of the second interconnecting strip 22 and the projection of the second end battery cell 3012 do overlap.

[0229] Exemplarily, in the third direction Z, the second interconnection strip 22 overlaps with the projection of the first end cell tab 3011, and the second interconnection strip 22 also overlaps with the projection of the second end cell tab 3012.

[0230] In the present embodiment, the second interconnection strip 22 overlaps with the projection of the first end cell tab 3011, and the second interconnection strip 22 also overlaps with the projection of the second end cell tab 3012, which can further reduce the distance between the adjacent cell strings 303 in the first direction X, thereby further increasing the number of cell tabs 301 that can be arranged to improve the output power of the photovoltaic module.

[0231] As shown in Figure 29 in the third direction Z, the geometric center of the second interconnection strip 22 is located within the projection area of the interconnection part 23, i.e. the interconnection part 23 is arranged at the center position of the second interconnection strip 22, so that the distance between the interconnection part 23 and the cell tabs 301 on both sides is equal or similar, so as to improve the uniformity of the arrangement of the cell strings 303 in the first direction X.

[0232] As shown in Figure 29 in the first direction X, the interconnection part 23 leaves a gap with the cell tab 301, thereby reducing the risk of short circuit of the cell tab 301 caused by direct contact between the interconnection part 23 and the cell tab 301.

[0233] As shown in Figure 29 in the first direction X, the width of the second interconnection strip 22 is H4, and the width of the interconnection part 23 is H5, 1.3 < H4 / H5 ≤ 75, exemplarily, H4 / H5 can be equal to 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, etc.

[0234] If the value of H4 / H5 is small, the width difference between the second interconnection strip 22 and the interconnection part 23 is small, and the risk of short circuit of the cell tab 301 caused by the contact between the interconnection part 23 and the cell tab 301 is high.

[0235] If the ratio of H4 / H5 is large, the width of the second interconnection strip 22 is large, which leads to high material cost of the second interconnection strip 22, or the width of the interconnection part 23 is small, which leads to poor current transmission capacity of the interconnection part 23, and also leads to poor connection stability of the interconnection part 23 and the electrical connector 4.

[0236] Therefore, in the embodiment, 1.3 < H4 / H5 < 75, the width difference between the second interconnection strip 22 and the interconnection part 23 can be increased, thereby reducing the risk of short circuit of the battery piece 301 caused by the contact between the interconnection part 23 and the battery piece 301, and meanwhile, the width of the second interconnection strip 22 can be reduced, the material cost of the second interconnection strip 22 is relatively low, the width of the interconnection part 23 can be increased, thereby improving the current transmission capacity of the interconnection part 23 and the connection stability of the interconnection part 23 and the electrical connector 4, and further improving the output power and working stability of the photovoltaic module.

[0237] For example, 1.3 < H4 / H5 < 1.7, and H4 / H5 can be equal to 1.31, 1.33, 1.35, 1.37, 1.39, 1.4, 1.41, 1.43, 1.45, 1.47, 1.49, 1.5, 1.51, 1.53, 1.55, 1.57, 1.59, 1.6, 1.61, 1.63, 1.65, 1.67, 1.69, 1.7, etc.

[0238] For example, 1.7 < H4 / H5 < 10.7, and H4 / H5 can be equal to 1.7, 1.71, 1.75, 2, 2.5, 2.7, 3, 3.5, 3.7, 4, 4.5, 4.7, 5, 5.5, 5.7, 6, 6.5, 6.7, 7, 7.5, 7.7, 8, 8.5, 8.7, 9, 9.5, 9.7, 10, 10.5, 10.7, etc.

[0239] For example, 10.7 < H4 / H5 < 16.7, and H4 / H5 can be equal to 10.7, 10.71, 10.75, 11, 11.3, 11.5, 11.7, 11.9, 12, 12.1, 12.3, 12.5, 12.7, 12.9, 13, 13.1, 13.3, 13.5, 13.7, 13.9, 14, 14.1, 14.3, 14.5, 14.7, 14.9, 15, 15.1, 15.3, 15.5, 15.7, 15.9, 16, 16.1, 16.3, 16.5, 16.6, 16.69, etc.

[0240] For example, 1.3 < H1 / H2 < 16.7, and H1 / H2 can be equal to 1.31, 1.5, 1.7, 2, 2.7, 3, 3.7, 4, 4.7, 5, 5.7, 6, 6.7, 7, 7.7, 8, 8.7, 9, 9.7, 10, 10.7, 11, 11.7, 12, 12.7, 13, 13.7, 14, 14.7, 15, 15.7, 16, 16.6, etc.

[0241] For example, 16.7≤H1 / H2≤20, H1 / H2 can be equal to 16.7, 16.8, 16.9, 17, 17.2, 17.4, 17.6, 17.8, 18, 18.2, 18.4, 18.6, 18.8, 19, 19.2, 19.4, 19.6, 19.8, 20, etc.

[0242] For example, 20≤H1 / H2≤55, H1 / H2 can be equal to 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, etc.

[0243] For example, 55≤H1 / H2≤75, H1 / H2 can be equal to 55, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 75, etc.

[0244] The width H4 of the second interconnection strip 22 satisfies: 4mm≤H4≤15mm, for example, H4 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0245] For example, 4mm≤H4≤7mm, H4 can be 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, 6.8mm, 7mm, etc.

[0246] For example, 7mm≤H4≤10mm, H4 can be 7mm, 7.2mm, 7.4mm, 7.6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.6mm, 9.8mm, 10mm, etc.

[0247] For example, 4mm≤H4≤10mm, H4 can be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0248] For example, 10mm≤H4≤15mm, H4 can be 10mm, 10.2mm, 10.4mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.4mm, 14.6mm, 14.8mm, 15mm, etc.

[0249] The width H5 of the interconnecting portion 23 satisfies 0.2mm≤H5≤3mm, and exemplary H5 can be 0.2mm, 0.4mm, 0.6mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0250] Exemplary 0.2mm≤H5≤0.6mm, and H5 can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, etc.

[0251] Exemplary 0.6mm≤H5≤1mm, and H5 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.

[0252] Exemplary 1mm≤H5≤3mm, and H5 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc.

[0253] In the first direction X, the distance between the interconnecting portion 23 and the edge of the battery sheet 301 is greater than 0, and the distance between the interconnecting portion 23 and the edge of the battery sheet 301 is less than or equal to 1.5mm, and exemplary in the first direction X, the distance between the interconnecting portion 23 and the edge of the battery sheet 301 can be 0.01mm, 0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.5mm, etc.

[0254] In this embodiment, if the distance between the interconnecting portion 23 and the edge of the battery sheet 301 is larger, the area of the blank area of the photovoltaic module is larger, which will affect the output power of the photovoltaic module.

[0255] Therefore, the distance between the interconnecting portion 23 and the edge of the battery sheet 301 is greater than 0, and the distance between the interconnecting portion 23 and the edge of the battery sheet 301 is less than or equal to 1.5mm, which reduces the risk of the battery sheet 301 being short-circuited by the interconnecting portion 23 due to the contact between the interconnecting portion 23 and the battery sheet 301, and also reduces the area ratio of the blank area on the photovoltaic module, thereby improving the output power of the photovoltaic module.

[0256] For example, the distance between the interconnection portion 23 and the edge of the battery cell 301 is greater than 0, and the distance between the interconnection portion 23 and the edge of the battery cell 301 is less than or equal to 0.4 mm. In the first direction X, the distance between the interconnection portion 23 and the edge of the battery cell 301 can be 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4 mm, etc.

[0257] For example, the distance between the interconnection portion 23 and the edge of the battery cell 301 is between 0.4 mm and 1.5 mm. In the first direction X, the distance between the interconnection portion 23 and the edge of the battery cell 301 can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc.

[0258] In the second direction Y, the length of the interconnecting part 23 can be equal to the length of the second interconnecting strip 22, that is, the end of the interconnecting part 23 is aligned with the end of the second interconnecting strip 22.

[0259] or, Figure 31 This is a top view of the connection structure between the second interconnecting strip and the interconnecting part from a third-party perspective. (See attached image.) Figure 31 As shown, the length of the interconnect portion 23 is less than the length of the second interconnect strip 22, reducing the risk of the interconnect portion 23 protruding from the second interconnect strip 22 in the second direction Y. At this time, a gap needs to be left between the end of the interconnect portion 23 and the end of the second interconnect strip 22 in the second direction Y, and the size of the gap in the second direction Y is H6.

[0260] When the second interconnecting strip 22 is bent out along the third direction Z and welded to the junction box, 20mm≤H6≤50mm. For example, H6 can be 20mm, 30mm, 40mm, 50mm, etc.

[0261] In this embodiment, if H6 is small, the bending dimension of the reserved second interconnecting strip 22 is small, increasing the difficulty of connecting the second interconnecting strip 22 to the junction box. If H6 is large, the material cost of the second interconnecting strip 22 is high. Therefore, 20mm≤H6≤50mm can reduce the difficulty of connecting the second interconnecting strip 22 to the junction box and also reduce the material cost of the second interconnecting strip 22.

[0262] For example, 20mm≤H6≤35mm, H6 can be 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, etc.

[0263] For example, 35mm≤H6≤50mm, H6 can be 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, etc.

[0264] When the second interconnecting strip 22 does not need to be welded with the terminal box, 0mm≤H6≤5mm, for example, H6 can be 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc.

[0265] In the present embodiment, if H6 is larger, the material cost of the second interconnecting strip 22 is higher. Therefore, 0mm≤H6≤5mm, the material cost of the second interconnecting strip 22 can be reduced.

[0266] For example, 0mm≤H6≤2.5mm, H6 can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc.

[0267] For example, 2.5mm≤H6≤5mm, H6 can be 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, etc.

[0268] Figure 32 The top view of the connection structure of the interconnecting part and the electrical connector in the third direction. As shown in FIG. 6, the second interconnecting strip 22 is connected to the electrical connector 20 in the third direction. Figure 32As shown, the electrical connecting piece 4 comprises an electrical connecting body 41 and an electrical connecting part 42, the electrical connecting body 41 comprises a first electrical connecting body 411 and a second electrical connecting body 412, the electrical connecting part 42 is located between the first electrical connecting body 411 and the second electrical connecting body 412 in the first direction X, the first electrical connecting body 411 and the second electrical connecting body 412 are respectively electrically connected with the adjacent battery string 303, and the electrical connecting part 42 is electrically connected with the interconnection part 23.

[0269] In the second direction Y, the width of the electrical connecting part 42 is greater than the width of the first electrical connecting body 411, and the width of the electrical connecting part 42 is greater than the width of the second electrical connecting body 412, so that the electrical connecting part 42 and the interconnection part 23 have a larger contact area, thereby improving the connection stability of the electrical connecting part 42 and the interconnection part 23, and further improving the working stability of the photovoltaic module, and also being capable of reducing the contact resistance between the electrical connecting part 42 and the interconnection part 23, thereby improving the output power of the photovoltaic module.

[0270] In the third direction Z, the thickness of the electrical connecting part 42 and the first electrical connecting body 411 can be the same or different, and the thickness of the electrical connecting part 42 and the second electrical connecting body 412 can be the same or different.

[0271] Figure 33 It is a schematic view of the local structure of the electrical connecting piece. As shown, Figure 33 In the third direction Z, the thickness of the electrical connecting part 42 is less than the thickness of the first electrical connecting body 411, and the thickness of the electrical connecting part 42 is less than the thickness of the second electrical connecting body 412, and in the processing process, the middle part of the electrical connecting piece 4 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing cost of the edge solder strip 3, and being conducive to shortening the processing period of the edge solder strip 3.

[0272] In the third direction Z, the thickness of the electrical connecting part 42 is less than the thickness of the first electrical connecting body 411, and the thickness of the electrical connecting part 42 is less than the thickness of the second electrical connecting body 412, and in the processing process, the middle part of the electrical connecting piece 4 can be flattened to form the second body 32, thereby simplifying the processing of the edge solder strip 3, reducing the processing cost of the edge solder strip 3, and being conducive to shortening the processing period of the edge solder strip 3.

[0273] If the thickness of the electrical connecting part 42 is small, the structural strength of the electrical connecting part 42 is poor. If the thickness of the electrical connecting part 42 is large, the contact area between the electrical connecting part 42 and the interconnection part 23 is small. Therefore, in the present embodiment, the thickness of the electrical connecting part 42 in the third direction Z is 0.1mm~0.15mm, which can improve the structural strength of the electrical connecting part 42, and at the same time, can increase the contact area between the electrical connecting part 42 and the interconnection part 23, thereby improving the working stability of the photovoltaic module.

[0274] Exemplarily, the thickness of the electric connecting part 42 in the third direction Z can be 0.1mm~0.13mm, and the thickness of the electric connecting part 42 can be 0.1mm, 0.105mm, 0.11mm, 0115mm, 0.12mm, 0.125mm, 0.13mm, etc.

[0275] Exemplarily, the thickness of the electric connecting part 42 in the third direction Z can be 0.13mm~0.15mm, and the thickness of the electric connecting part 42 can be 0.13mm, 0.135mm, 0.14mm, 0.145mm, 0.15mm, etc.

[0276] The first electric connecting body 411, the electric connecting part 42 and the second electric connecting body 412 can be a split structure or an integrally formed structure.

[0277] As shown in Figure 33 The electric connecting part 42 includes a first connecting section 421 and a second connecting section 422, the first connecting section 421 and the first electric connecting body 411 are an integrally formed structure, the second connecting section 422 and the second electric connecting body 412 are an integrally formed structure, and the first connecting section 421 and the second connecting section 422 are connected and fixed.

[0278] The structure composed of the second connecting section 422 and the second electric connecting body 412 is referred to as the first electric connecting piece 43, and the structure composed of the first connecting section 421 and the second connecting section 422 is referred to as the second electric connecting piece 44. In the processing process, the first electric connecting piece 43 and the second electric connecting piece 44 can be processed respectively, and then the first electric connecting piece 43 is welded on the first end battery piece 3011 and the second electric connecting piece 44 is welded on the second end battery piece 3012, and then the first connecting section 421 and the second connecting section 422 are connected and fixed, so as to connect the adjacent battery strings 303 into a battery string group 305.

[0279] In the embodiment, the electric connecting piece 4 for connecting the adjacent two battery strings 303 is connected and formed by the split first electric connecting piece 43 and the second electric connecting piece 44, so that the first electric connecting piece 43 and the second electric connecting piece 44 can be welded and fixed with the battery piece 301 respectively, thereby simplifying the connection difficulty of the first electric connecting piece 43 and the second electric connecting piece 44 with the battery piece 301 and reducing the preparation difficulty of the battery string group 305.

[0280] The first connecting section 421 and the second connecting section 422 can be directly connected or indirectly connected through the interconnection part 23.

[0281] When the first connecting section 421 and the second connecting section 422 are directly connected, the first connecting section 421 and the second connecting section 422 are respectively connected and fixed with the interconnection part 23, thereby improving the connection stability of the first electrical connector 43 and the interconnection part 23 and the second electrical connector 44 and the interconnection part 23.

[0282] When the first connecting section 421 and the second connecting section 422 are directly connected, as shown in Figure 32 , the first connecting section 421 and the second connecting section 422 can be arranged and contacted in the first direction X, and are connected and fixed at the contact surface.

[0283] When the first connecting section 421 and the second connecting section 422 are directly connected, Figure 34 , as shown in Figure 34 , the first connecting section 421 and the second connecting section 422 can be arranged and contacted in the second direction Y, and are connected and fixed at the contact surface.

[0284] When the first connecting section 421 and the second connecting section 422 are directly connected, Figure 35 , as shown in Figure 35 , in the third direction Z, the projections of the first connecting section 421 and the second connecting section 422 can have an overlapping part, that is, the first connecting section 421 and the second connecting section 422 are stacked in the third direction Z, and are connected and fixed at the contact surface.

[0285] When the first connecting section 421 and the second connecting section 422 are indirectly connected through the interconnection part 23, the first connecting section 421 and the second connecting section 422 can be in contact or have a gap, and the arrangement mode of the first connecting section 421 and the second connecting section 422 can refer to the mode shown in Figure 32 to Figure 35 , which will not be described here.

[0286] Figure 36 is a sectional view of the connection structure of the second interconnection strip and the battery string in another embodiment. As shown in Figure 36 , the photovoltaic module further includes a separation piece 6, and in the third direction Z, the separation piece 6 is located between the second interconnection strip 22 and the battery sheet 301, that is, between the back light surface of the battery sheet 301 and the second interconnection strip 22 and between the string welding band 302 of the back light surface and the second interconnection strip 22, and the separation piece 6 is insulated, thereby reducing the risk of short circuit of the battery sheet 301 caused by the contact between the second interconnection strip 22 and the battery sheet 301, thereby improving the working stability of the battery sheet 301 and the photovoltaic module.

[0287] As shown in Figure 36As shown, in the first direction X, the separator 6 extends toward the outside of the cell 301 in the direction toward the interconnection part 23. That is, the separator 6 protrudes from the edge of the cell 301 in the first direction X, which further reduces the risk of short circuit of the cell 301 caused by the second interconnection strip 22 contacting the cell 301, and further improves the working stability of the cell 301 and the photovoltaic module.

[0288] like Figure 36 As shown, in the first direction X, the insulating member 6 contacts the interconnecting part 23, thereby improving the insulation effect of the insulating member 6.

[0289] Alternatively, in the first direction X, a gap is left between the isolator 6 and the interconnection part 23 to reduce the risk of installation difficulties caused by interference between the isolator 6 and the interconnection part 23, thereby reducing the installation difficulty.

[0290] Figure 37 This is a sectional view of the isolation component. (e.g.) Figure 37 As shown, the isolation member 6 includes at least a first isolation layer 61, a second isolation layer 62 and a third isolation layer 63. In the third direction Z, the second isolation layer 62 is located between the first isolation layer 61 and the third isolation layer 63.

[0291] For example, the first isolation layer 61 can be EVA, or it can be an EVA-POE-EVA three-layer co-extruded structure, or it can be PO (Polyolefin).

[0292] For example, the material of the second isolation layer 62 is PET.

[0293] For example, the third isolation layer 63 can be EVA, PO (Polyolefin), or a three-layer co-extruded structure of EVA-POE-EVA.

[0294] In the second direction Y, the number of isolation element 6 is one. Figure 38 This is a bottom view of the connection structure between the separator and the first end cell in some embodiments. The bottom view refers to the diagram obtained by looking at the cell from the backside of the cell. For example... Figure 38 As shown, in the middle region of the battery string group 305, on a battery string 303 of a battery string group 305, all the battery cells 301 arranged along the second direction Y are connected to the same separator 6, that is, all the first end battery cells 3011 arranged along the second direction Y are connected to the same separator 6, and all the second end battery cells 3012 arranged along the second direction Y are connected to the same separator 6.

[0295] In the second direction Y, there are multiple isolation elements 6. Figure 39 This is a bottom view of the connection structure between the separator and the first end battery cell in some other embodiments, such as...Figure 39 As shown, in the second direction Y, the number of the isolation pieces 6 is multiple, and the isolation pieces 6 correspond to the battery string groups one by one, that is, the isolation pieces 6 correspond to the first end battery pieces 3011 of the middle region one by one, and the isolation pieces 6 correspond to the second end battery pieces 3012 of the middle region one by one.

[0296] In the second direction Y, the number of the isolation pieces 6 is multiple. Figure 40 The connection structure of the isolation piece and the first end battery piece in some embodiments is shown in the view as follows: Figure 40 As shown, in the second direction Y, the number of the isolation pieces 6 is multiple, and one isolation piece 6 is connected with at least two battery string groups, that is, at least two first end battery pieces 3011 arranged along the second direction Y are connected with the same isolation piece 6, and at least two second end battery pieces 3012 arranged along the second direction Y are connected with the same isolation piece 6 at the middle region.

[0297] The thickness of the isolation piece 6 in the third direction Z is 0.1mm-0.8mm, and the thickness of the isolation piece 6 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

[0298] The thickness of the isolation piece 6 in the third direction Z is 0.1mm-0.5mm, and the thickness of the isolation piece 6 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc.

[0299] The thickness of the isolation piece 6 in the third direction Z is 0.5mm-0.8mm, and the thickness of the isolation piece 6 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc.

[0300] The width of the isolation piece 6 in the first direction X is 6mm-30mm, and the width of the isolation piece 6 can be 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc.

[0301] The width of the isolation piece 6 is 6mm-10mm, and the width of the isolation piece 6 can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0302] The width of the isolation piece 6 is 10mm-20mm, and the width of the isolation piece 6 can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0303] For example, the width of the isolation piece 6 is 20mm~30mm, and the width of the isolation piece 6 can be 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc.

[0304] Based on the above structure, the electrical connecting piece 4 is located at the light-receiving surface of the battery piece 301, or the electrical connecting piece 4 is located at the back surface of the battery piece 301.

[0305] Figure 41 The sectional view of the middle area of the battery string group in one embodiment is shown in FIG. 6. As shown in FIG. 6, when the second interconnection strip 22 is located at the back surface of the battery piece 301 and the electrical connecting piece 4 is located at the light-receiving surface of the battery piece 301, in the third direction Z, the distance between the light-receiving surface of the electrical connecting body 41 and the back surface of the battery piece 301 is W1, the distance between the light-receiving surface of the second interconnection strip 22 and the back surface of the battery piece 301 is W2, and the thickness of the interconnection part 23 is W3, W2≤W3<W1, or W2<W3≤W1, so that the interconnection part 23 can be connected with the electrical connecting piece 4 at the light-receiving surface, and at the same time, the risk of the local protrusion caused by the high height of the interconnection part 23 lifting the electrical connecting piece 4 is reduced, thereby reducing the risk of damage to the laminated piece at the local protrusion during the laminating process. Figure 41

[0306] The sectional view of the middle area of the battery string group in another embodiment is shown in FIG. 7. As shown in FIG. 7, when the second interconnection strip 22 is located at the back surface of the battery piece 301 and the electrical connecting piece 4 is located at the back surface of the battery piece 301, in the third direction Z, the distance between the light-receiving surface of the electrical connecting body 41 and the light-receiving surface of the second interconnection strip 22 is W4, the distance between the back surface of the electrical connecting body 41 and the light-receiving surface of the second interconnection strip 22 is W5, and the thickness of the interconnection part 23 is W6, W5≤W6<W4, or W5<W6≤W4, so that the interconnection part 23 can be connected with the electrical connecting piece 4 at the back surface, and at the same time, the risk of the local protrusion caused by the high height of the interconnection part 23 lifting the electrical connecting piece 4 is reduced, thereby reducing the risk of damage to the laminated piece at the local protrusion during the laminating process. Figure 42 Figure 42 In the third direction Z, the thickness of the second interconnection strip 22 is 0.05mm~0.4mm, and for example, the thickness of the second interconnection strip 22 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc.

[0307] In the third direction Z, the thickness of the second interconnection strip 22 is 0.05mm~0.4mm, and for example, the thickness of the second interconnection strip 22 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, etc.

[0308] ​Exemplarily, the thickness of the second interconnection strip 22 is 0.05mm~0.1mm, and the thickness of the second interconnection strip 22 can be 0.05mm, 0.055mm, 0.06mm, 0.065mm, 0.07mm, 0.075mm, 0.08mm, 0.085mm, 0.09mm, 0.095mm, 0.1mm, etc.

[0309] Exemplarily, the thickness of the second interconnection strip 22 is 0.1mm~0.2mm, and the thickness of the second interconnection strip 22 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc.

[0310] Exemplarily, the thickness of the second interconnection strip 22 is 0.2mm~0.4mm, and the thickness of the second interconnection strip 22 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc.

[0311] Exemplarily, the thickness of the second interconnection strip 22 is 0.2mm~0.4mm, and the thickness of the second interconnection strip 22 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc.

[0312] Exemplarily, the thickness of the second interconnection strip 22 is 0.2mm~0.4mm, and the thickness of the second interconnection strip 22 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc.

[0313] Exemplarily, the thickness of the second interconnection strip 22 is 0.2mm~0.4mm, and the thickness of the second interconnection strip 22 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, etc.

[0314] Based on the structure of the intermediate region described above, the third aspect of the embodiments of the present application provides a manufacturing method of a photovoltaic module, Figure 43 The flowchart of the manufacturing method of the photovoltaic module in some embodiments is shown in FIG. 3. As shown in FIG. 3, the manufacturing method of the photovoltaic module includes: Figure 43 S1: preparing a cell string group 305.

[0315] S2: arranging a plurality of cell string groups 305 along a second direction Y. ​

[0316] S3: placing the interconnection part 23 on the electrical connecting part 4 in the first direction X, the interconnection part extending in the second direction Y, and the interconnection part 23 being located on the back light surface of the battery string group 305 in the third direction Z.

[0317] S4: welding and fixing the interconnection part 23 and the electrical connecting part 4.

[0318] S5: laying the encapsulation layer 20 and the cover plate 10 on the light surface and the back light surface of the battery string group 305, laminating and fixing to form a laminated part.

[0319] S6: installing a frame on the edge of the laminated part to form a photovoltaic module.

[0320] Before or after step S3, the manufacturing method of the photovoltaic module further comprises: S7: welding and fixing the interconnection part 23 on the second interconnection strip 22.

[0321] In the embodiment, the second interconnection strip 22 is located on the back light surface of the battery sheet 301, so that part of the structure of the second interconnection strip 22 is shielded by the battery sheet 301. Without adjusting the size of the battery sheet 301 and the second interconnection strip 22 in the first direction X, the total size of the second interconnection strip 22 and the battery string 303 in the first direction X can be reduced, so as to reduce the arrangement space of the second interconnection strip 22 and the battery string 303, so as to arrange more battery sheets 301 in the limited space, thereby improving the screen ratio of the photovoltaic module and improving the output power of the photovoltaic module.

[0322] Figure 43 It is illustrated that step S7 is after step S4 and step S7 is before step S5.

[0323] Figure 44 The flow chart of the manufacturing method of the photovoltaic module in another embodiment is shown in Figure 44 It is illustrated that step S7 is before step S3.

[0324] For the integrated structure or the split structure of the electrical connecting part, the embodiments of the present application provide different preparation methods.

[0325] When the electrical connecting part is a split structure, Figure 45 The flow chart of step S1 in some embodiments is shown in Figure 45 As shown in the figure, step S1 comprises: S11: arranging the plurality of battery sheets 301 in the first direction X.

[0326] S12: placing the string welding belt 302 and the electrical connecting part 4 on the battery sheet 301 and welding and fixing to form the battery string 303.

[0327] S13: arranging at least two battery strings 303 in the first direction X.

[0328] S14: welding and fixing the electrical connectors 4 of adjacent battery strings 303 to form a battery string group.

[0329] The adjacent electrical connectors 4 are the first electrical connector 43 and the second electrical connector 44 described above, which can be arranged opposite to each other in the first direction X, or can be arranged opposite to each other in the second direction Y, or can have an overlapping part in the third direction Z.

[0330] Figure 46 For Figure 45 the steps in some embodiments of the flowchart as shown in Figure 46 Before step S12, the method for manufacturing a photovoltaic module further comprises: S01: flattening the end of the electrical connector 4 to form an electrical connection part 42, and the part of the electrical connector 4 that is not flattened is an electrical connector body 41. In the first direction X, the electrical connection parts 42 of adjacent electrical connectors 4 are the first connection section 421 and the second connection section 422 described above.

[0331] After step S01, step S12 comprises: Placing the electrical connector body 41 on the cell sheet 301 and welding and fixing to form the battery string 303.

[0332] Step S14 comprises: Connecting and fixing the first connection section 421 and the second connection section 422.

[0333] When the electrical connector is a one-piece structure, Figure 47 For Figure 47 the steps in some embodiments of the flowchart as shown in Step S1 comprises: S15: arranging a plurality of cell sheets 301 in the first direction X.

[0334] S16: placing the string welding ribbon 302 on the cell sheet 301 and welding and fixing to form the battery string 303.

[0335] S17: arranging at least two battery strings 303 in the first direction X.

[0336] S18: In the first direction X, the two ends of the electrical connector 4 are placed on adjacent battery strings 303 respectively and welded and fixed to form a battery string group 305.

[0337] Figure 48 For Figure 47 the steps in some embodiments of the flowchart as shown in Figure 48As shown, before step S18, the method for manufacturing the photovoltaic module further comprises: S02: flattening the middle part of the electrical connecting member 4 to form the electrical connecting part 42, and the part of the electrical connecting member not flattened is the electrical connecting body 41.

[0338] After step S01, step S18 comprises: Placing the electrical connecting body 41 on the adjacent battery string 303 respectively and welding and fixing.

[0339] When the back light surface of the battery piece 301 is provided with the isolation member 6, the isolation member 6 can be fixed on the battery string 303 first, and then the battery string 303 is welded to form the battery string group 305. Alternatively, the battery string 303 can be welded to form the battery string group 305 first, and then the isolation member 6 is fixed on the battery string group 305.

[0340] For example, as shown in the flowchart of step S1 in some embodiments, Figure 48 For example, as shown in the flowchart of step S1 in some embodiments, Figure 49 For example, as shown in the flowchart of part of the steps of step S1 in some embodiments, Figure 49 As shown, after step S16 and before step S17, step S1 comprises: S03: placing the isolation member 6 on the back light surface of the battery string 303.

[0341] S04: fixing the isolation member 6 on the battery string 303 by spot pressing process.

[0342] For example, as shown in the flowchart of step S1 in some embodiments, Figure 48 For example, as shown in the flowchart of step S1 in some embodiments, Figure 50 For example, as shown in the flowchart of part of the steps of step S1 in some embodiments, Figure 50 As shown, after step S3 and before step S4, the method for manufacturing the photovoltaic module further comprises: S05: placing the isolation member 6 on the back light surface of the battery string group 305.

[0343] S06: fixing the isolation member 6 on the battery string group 305 by spot pressing process.

[0344] In the above steps S03 and S05, the specific steps of the spot pressing process can be: Blowing hot air on the isolation member 6 to fix the isolation member 6 on the battery piece 301.

[0345] Alternatively, the specific steps of the spot pressing process can be: Irradiating the isolation member 6 by infrared lamp tube to fix the isolation member 6 on the battery piece 301.

[0346] The specific steps of the spot pressing process are not specially limited in the embodiments of the present application.

[0347] In summary, in the method for manufacturing the photovoltaic module provided in the embodiments of the present application, the interconnecting part 23 can be first fixed on the cell string group 305, and then the second interconnecting strip 22 is connected and fixed with the interconnecting part 23. Alternatively, the interconnecting part 23 and the second interconnecting strip 22 can be first connected and fixed as a whole, and then the whole is fixed on the cell string group 305.

[0348] The isolation piece 6 can be first fixed on the cell string 303, and then the cell string 303 is connected as the cell string group 305. Alternatively, the cell string 303 can be first connected as the cell string group 305, and then the isolation piece 6 is fixed on the cell string group 305.

[0349] It should be noted that if the cell string 303 is first connected as the cell string group 305, and then the interconnecting part 23, the second interconnecting strip 22 and the isolation piece 6 are fixed on the cell string group 305, the following two steps exist: Firstly, the isolation piece 6 is fixed on the cell string group 305, and then the interconnecting part 23 and the second interconnecting strip 22 are fixed on the cell string group.

[0350] Secondly, the interconnecting part 23, the second interconnecting strip 22 and the isolation piece 6 are connected as a whole, and then the whole is fixed on the cell string group 305.

[0351] The above merely provides preferred embodiments of the present application but is not intended to limit the present application. For those skilled in the present art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic module, characterized by, The photovoltaic module comprises: a cell string group (305) comprising at least two cell strings (303) arranged along a first direction (X), the cell string (303) comprising a plurality of cell pieces (301) and string welding bands (302), in the first direction (X), adjacent cell pieces (301) are electrically connected by the string welding bands (302), and adjacent cell strings (303) are electrically connected by the string welding bands (302); a plurality of cell string groups (305) arranged along a second direction (Y), the first direction (X) intersecting the second direction (Y); a second bus bar (12) located on one side or both sides of the cell string group (305) in the first direction (X); a connecting part (13) located on the side of the second bus bar (12) facing the cell piece (301) in the thickness direction of the cell piece (301), the second bus bar (12) and the string welding band (302) being electrically connected through the connecting part (13), and adjacent cell string groups (305) being electrically connected through the second bus bar (12); the second bus bar (12) is located on the back light surface of the cell string group (305), and the projection of the second bus bar (12) overlaps the projection of the cell piece (301) in the thickness direction of the cell piece (301).

2. The photovoltaic module of claim 1, wherein, The connecting part (13) and the second bus bar (12) are welded and fixed or hot-pressed and fixed. Alternatively, the second bus bar (12) and the connecting part (13) are integrally formed.

3. The photovoltaic module of claim 1, wherein, The second bus bar (12) comprises a first edge (121) and a second edge (122) arranged along the first direction (X), in the first direction (X), the first edge (121) is located on the side of the second bus bar (12) facing the cell string group (305), and the second edge (122) is located on the side of the second bus bar (12) facing away from the cell string group (305); in the thickness direction of the cell piece (301), the edge of the connecting part (13) is aligned with the second edge (122).

4. The photovoltaic module of claim 3, wherein, In the first direction (X), the width of the second bus bar (12) is H1, and the width of the connecting part (13) is H2, 1.3 In the second direction (Y), the length of the connecting part (13) is less than the length of the second bus bar (12).

5. The photovoltaic module of claim 1, wherein, The string welding band (302) comprises an edge welding band (3), the edge welding band (3) comprising a first body (31) and a second body (32) arranged along the first direction (X), the first body (31) being electrically connected with the cell piece (301), and the second body (32) being electrically connected with the connecting part (13); in the second direction (Y), the width of the second body (32) is greater than the width of the first body (31).

6. The photovoltaic module of claim 5, wherein, The thickness of the second body (32) is less than the thickness of the first body (31) in the thickness direction of the cell (301).

7. The photovoltaic module of claim 6, wherein, The edge solder strip (3) is located on the light-receiving surface or the back surface of the cell (301). When the edge solder strip (3) is located on the light-receiving surface of the cell (301), the distance between the light-receiving surface of the first body (31) and the back surface of the cell (301) is L1, the distance between the light-receiving surface of the second bus bar (12) and the back surface of the cell (301) is L2, and the thickness of the connecting part (13) is L3 in the thickness direction of the cell (301), and L2≤L3 When the edge solder strip (3) is located on the back surface of the cell (301), the distance between the light-receiving surface of the first body (31) and the light-receiving surface of the second bus bar (12) is L4, the distance between the back surface of the first body (31) and the light-receiving surface of the second bus bar (12) is L5, and the thickness of the connecting part (13) is L6 in the thickness direction of the cell (301), and L5≤L6 8. The photovoltaic module according to any of claims 1 to 7, characterized in that, The cross-sectional shape of the connecting part (13) is rectangular.

9. The photovoltaic module according to any of claims 1 to 7, characterized in that, The photovoltaic module further comprises an insulation strip (5) located between the second bus bar (12) and the cell (301) in the thickness direction of the cell (301).

10. The photovoltaic module of claim 9, wherein, In the first direction (X), the insulation strip (5) extends to the outside of the cell (301) in the direction of the connecting part (13).

11. The photovoltaic module of claim 9, wherein, In the second direction (Y), the number of insulation strips (5) is one. Alternatively, in the second direction (Y), the number of insulation strips (5) is multiple, and each insulation strip (5) corresponds to one cell string group (305). Alternatively, in the second direction (Y), the number of insulation strips (5) is multiple, and one insulation strip (5) is connected to at least two cell string groups (305).

12. A method of manufacturing a photovoltaic module, characterized by, The manufacturing method of the photovoltaic module comprises: Preparation of a cell string group (305) comprising at least two cell strings (303) arranged in a first direction (X), the cell string (303) comprising a plurality of cells (301) and string solder strips (302), the adjacent cells (301) being electrically connected by the string solder strips (302) in the first direction (X), and the adjacent cell strings (303) being electrically connected by the string solder strips (302); Arranging a plurality of cell string groups (305) in a second direction (Y), the first direction (X) intersecting the second direction (Y); In the first direction (X), the connecting part (13) is placed on one side or both sides of the cell string group (305), the connecting part (13) extends in the second direction (Y), and the connecting part (13) is located on the back surface of the cell string group (305) in the thickness direction of the cell (301); Welding and fixing the connecting part (13) and the string ribbon (302); Laying encapsulation layer (20) and cover plate (10) on the light side and the back side of the battery string group (305), laminating and fixing to form a laminated part; Installing a frame on the edge of the laminated part to form a photovoltaic module; Before or after the step of placing the connecting part (13) on one side or both sides of the battery string group (305), the method for manufacturing the photovoltaic module further comprises: Welding and fixing the connecting part (13) on the second bus bar (12).

13. The method of manufacturing a photovoltaic module according to claim 12, wherein, The string ribbon (302) comprises an edge ribbon (3), and before the step of preparing the battery string group (305), the method for manufacturing the photovoltaic module comprises: Flattening the end of the edge ribbon (3) to form a second body (32); The step of welding and fixing the connecting part (13) and the string ribbon (302) comprises: Welding and fixing the connecting part (13) and the second body (32).

14. The method of manufacturing a photovoltaic module according to claim 12, wherein, The step of preparing the battery string group (305) comprises: Arranging a plurality of the battery pieces (301) along the first direction (X); Placing the string ribbon (302) on the battery piece (301) and welding and fixing to form the battery string (303); Arranging at least two battery strings (303) along the first direction (X); Welding and fixing the string ribbons (302) of adjacent battery strings (303) to form the battery string group (305).

15. The method of manufacturing a photovoltaic module according to claim 12, wherein, The string ribbon (302) comprises a first ribbon (3021) and a second ribbon (3022), and the step of preparing the battery string group (305) comprises: Arranging a plurality of the battery pieces (301) along the first direction (X); Placing the first ribbon (3021) on the battery piece (301) and welding and fixing to form the battery string (303); Arranging at least two battery strings (303) along the first direction (X); In the first direction (X), placing both ends of the second ribbon (3022) on adjacent battery strings (303) and welding and fixing to form the battery string group (305).

16. The method of manufacturing a photovoltaic module according to claim 14 or 15, characterized in that, Before the step of arranging at least two battery strings (303) along the first direction (X), the method for manufacturing the photovoltaic module further comprises: Placing an insulation strip (5) on the battery string (303), and in the thickness direction of the battery piece (301), the insulation strip (5) is located on the back side of the battery piece (301); Fixing the insulation strip (5) and the battery string (303) by spot ironing process.

17. The method of manufacturing a photovoltaic module according to any one of claims 12 to 15, characterized in that, Before the step of welding and fixing the connecting part (13) and the string ribbon (302), the method for manufacturing the photovoltaic module further comprises: Placing an insulation strip (5) on the battery string group (305), and in the thickness direction of the battery piece (301), the insulation strip (5) is located on the back side of the battery piece (301); Fixing the insulation strip (5) and the battery string group (305) by spot ironing process.

Images