Photovoltaic cell string and photovoltaic module

Abstract

The utility model discloses a photovoltaic cell string and photovoltaic module, photovoltaic cell string includes at least two photovoltaic cell pieces, and each photovoltaic cell piece has oppositely arranged first surface and second surface, first interconnection structure includes electric contact's first transparent conductive layer and first conductive connecting piece, and first transparent conductive layer sets up on the first surface of photovoltaic cell piece and with photovoltaic cell piece electric contact, second interconnection structure includes electric contact's second transparent conductive layer and second conductive connecting piece, and second transparent conductive layer sets up on the second surface of photovoltaic cell piece and with photovoltaic cell piece electric contact, wherein, first conductive connecting piece on one photovoltaic cell piece and second conductive connecting piece on adjacent photovoltaic cell piece electric contact, the photovoltaic cell string and photovoltaic module of the utility model can improve ohmic contact, reduce shading area, improve fill factor and promote cell efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic cell technology, specifically relating to a photovoltaic cell string and a photovoltaic module. Background Technology

[0002] In the manufacturing process of photovoltaic modules, multiple solar cells are typically interconnected to form series or parallel photovoltaic strings. Traditional photovoltaic strings involve first connecting the cells to electrodes using current collectors, then connecting multiple cells together using the current collectors, and finally encapsulating them. The number of interconnected cells varies depending on the module design.

[0003] The photovoltaic cell strings in existing photovoltaic modules have the following defects: 1) The interconnection between the current collector and the electrode causes a large amount of shading and optical loss; 2) The contact area between the current collector and the electrode is small, resulting in electrical loss; 3) When problems such as fragmentation, cracking, or current collector misalignment occur during the manufacturing process of photovoltaic modules, rework is difficult; 4) During the actual operation of photovoltaic modules, when cell replacement is required, the modules cannot be disassembled and can only be replaced with new photovoltaic modules, resulting in resource waste; 5) Once the photovoltaic module design is fixed, it cannot be further changed or modified according to the actual environment.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a photovoltaic cell string and a photovoltaic module that can improve ohmic contact, reduce shading area, increase fill factor and improve cell efficiency.

[0006] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0007] A photovoltaic cell string, comprising:

[0008] At least two photovoltaic cells, each of which has a first surface and a second surface disposed opposite to each other;

[0009] The first interconnection structure includes a first transparent conductive layer and a first conductive connector. The first transparent conductive layer is disposed on a first surface of the photovoltaic cell and is in electrical contact with the photovoltaic cell. The first conductive connector is in electrical contact with the first transparent conductive layer.

[0010] The second interconnection structure includes a second transparent conductive layer and a second conductive connector. The second transparent conductive layer is disposed on the second surface of the photovoltaic cell and is in electrical contact with the photovoltaic cell. The second conductive connector is in electrical contact with the second transparent conductive layer.

[0011] In this embodiment, a first conductive connector on one of the photovoltaic cells is in electrical contact with a second conductive connector on an adjacent photovoltaic cell.

[0012] In one or more embodiments of this utility model, both the first conductive connector and the second conductive connector are magnetic conductive connectors, and the contact ends of the first conductive connector and the second conductive connector have opposite magnetic properties.

[0013] In one or more embodiments of this utility model, the first conductive connector is fixedly connected to the first transparent conductive layer; and / or,

[0014] The second conductive connector is fixedly connected to the second transparent conductive layer.

[0015] In one or more embodiments of the present invention, the first transparent conductive layer has a first extension portion extending outward from the first surface of the photovoltaic cell, and the first conductive connector is disposed in the first extension portion.

[0016] The second transparent conductive layer has a second extension extending outward from the second surface of the photovoltaic cell, and the second conductive connector is disposed in the second extension;

[0017] The first extension and the second extension extend in different directions.

[0018] In one or more embodiments of this utility model, the first extension and the second extension extend in opposite directions.

[0019] In one or more embodiments of this utility model, the first conductive connector is disposed on the side of the first transparent conductive layer or on the surface of the first transparent conductive layer facing the photovoltaic cell; and / or,

[0020] The second conductive connector is disposed on the side of the second transparent conductive layer or on the surface of the second transparent conductive layer facing the photovoltaic cell.

[0021] In one or more embodiments of this utility model, the side of the first conductive connector contacts the side of the first transparent conductive layer, and the surface of the first conductive connector facing away from the second conductive connector is flush with the surface of the first transparent conductive layer facing away from the photovoltaic cell; or, the surface of the first conductive connector facing away from the second conductive connector contacts the surface of the first transparent conductive layer facing the photovoltaic cell; and / or,

[0022] The side of the second conductive connector is in contact with the side of the second transparent conductive layer, and the surface of the second conductive connector facing away from the first conductive connector is flush with the surface of the second transparent conductive layer facing away from the photovoltaic cell; or, the surface of the second conductive connector facing away from the first conductive connector is in contact with the surface of the second transparent conductive layer facing the photovoltaic cell.

[0023] In one or more embodiments of this utility model, the dimension W of the first conductive connector along the length direction of the photovoltaic cell is... 11 The length L1 of the first transparent conductive layer is equal to that of the first conductive layer; and / or,

[0024] The dimension W of the first conductive connector along the thickness direction of the photovoltaic cell 12 For 0.05cm-0.5cm; and / or,

[0025] The first conductive connector has a dimension W along the width direction of the photovoltaic cell. 13 0.2cm-2cm; and / or,

[0026] The second conductive connector has a dimension W along the length of the photovoltaic cell. 21 The length L2 of the second transparent conductive layer is equal to that of the second transparent conductive layer; and / or,

[0027] The second conductive connector has a dimension W along the thickness direction of the photovoltaic cell. 22 For 0.05cm-0.5cm; and / or,

[0028] The second conductive connector has a dimension W along the width direction of the photovoltaic cell. 23 The value is 0.2cm-2cm.

[0029] In one or more embodiments of this utility model, a first adhesive is provided on the first surface, and the first transparent conductive layer is fixedly disposed to the first surface of the photovoltaic cell through the first adhesive.

[0030] A second adhesive is provided on the second surface, and the second transparent conductive layer is fixedly disposed to the second surface of the photovoltaic cell through the second adhesive.

[0031] In one or more embodiments of the present invention, a plurality of first gate lines are provided on the first surface at intervals, the first adhesive is located outside the first gate lines and / or between adjacent first gate lines, the height of the first adhesive is equal to the height of the first gate lines, and the first transparent conductive layer is in electrical contact with the plurality of first gate lines.

[0032] The second surface is provided with a plurality of second gate lines spaced apart, the second adhesive is located outside the second gate lines and / or between adjacent second gate lines, the height of the second adhesive is equal to the height of the second gate lines, and the second transparent conductive layer is in electrical contact with the plurality of second gate lines.

[0033] In one or more embodiments of this utility model, both the first adhesive and the second adhesive are transparent adhesives.

[0034] In one or more embodiments of this utility model, the first adhesive is one of a strip adhesive, a dot adhesive, or a sheet adhesive; and / or,

[0035] The second adhesive is one of a strip adhesive, a dot adhesive, or a sheet adhesive; and / or,

[0036] The widths of the first adhesive and the second adhesive are 10μm-30μm.

[0037] A photovoltaic module comprising the aforementioned photovoltaic cell string.

[0038] Compared with existing technologies, the photovoltaic cell string and photovoltaic module of this invention, by setting an interconnection structure composed of a transparent conductive layer and conductive connectors on the surface of the photovoltaic cell, replaces traditional current collectors such as solder ribbon, copper foil, and aluminum foil. This can improve ohmic contact and increase the fill factor while reducing the shading area and lowering costs, thereby improving cell efficiency. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1This is a schematic diagram of the structure of the photovoltaic cell string in Embodiment 1 of this utility model;

[0041] Figure 2 This is a top view of the photovoltaic cell string in Embodiment 1 of this utility model;

[0042] Figure 3 This is a schematic diagram of the photovoltaic cell structure of the photovoltaic cell string in Embodiment 1 of this utility model (with adhesive components provided);

[0043] Figure 4 for Figure 1 A detailed view of part A in the middle.

[0044] Figure 5 This is a detailed structural diagram of the photovoltaic cell string in Embodiment 2 of this utility model, corresponding to part A in Embodiment 1;

[0045] Figure 6 This is a detailed structural diagram of the photovoltaic cell string in Embodiment 3 of this utility model, corresponding to part A in Embodiment 1;

[0046] Figure 7 This is a detailed structural diagram of the photovoltaic cell string in Embodiment 4 of this utility model, corresponding to part A in Embodiment 1. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0048] This utility model discloses a photovoltaic cell string, comprising:

[0049] At least two photovoltaic cells, each photovoltaic cell having a first surface and a second surface disposed opposite to each other;

[0050] The first interconnection structure includes a first transparent conductive layer and a first conductive connector. The first transparent conductive layer is disposed on the first surface of the photovoltaic cell and is in electrical contact with the photovoltaic cell. The first conductive connector is in electrical contact with the first transparent conductive layer.

[0051] The second interconnection structure includes a second transparent conductive layer and a second conductive connector. The second transparent conductive layer is disposed on the second surface of the photovoltaic cell and is in electrical contact with the photovoltaic cell. The second conductive connector is in electrical contact with the second transparent conductive layer.

[0052] In this configuration, a first conductive connector on one photovoltaic cell is in electrical contact with a second conductive connector on an adjacent photovoltaic cell.

[0053] In the above technical solution, this utility model replaces traditional current collectors such as solder ribbons, copper foils, and aluminum foils by setting an interconnection structure composed of a transparent conductive layer and conductive connectors on the surface of photovoltaic cells. This can reduce the shading area and lower the cost while increasing the contact area, improving ohmic contact, increasing the fill factor and improving the cell efficiency. At the same time, the interconnection between multiple photovoltaic cells is achieved through the electrical contact setting of the conductive connectors between adjacent photovoltaic cells.

[0054] In one embodiment, both the first conductive connector and the second conductive connector are magnetic conductive connectors, and the contact ends of the first conductive connector and the second conductive connector have opposite magnetic properties.

[0055] In the above technical solution, the present invention facilitates the interconnection or separation of photovoltaic cells by setting magnetic conductive connectors, and facilitates the separate manufacturing of single photovoltaic cell modules (including photovoltaic cells, first interconnection structure and second interconnection structure), reducing rework losses in the manufacturing process of single photovoltaic cell modules. At the same time, it facilitates the maintenance and replacement of single photovoltaic cell modules during the operation of photovoltaic modules, and also makes the changes of module layout more flexible.

[0056] In one embodiment, a first adhesive is disposed on a first surface; a plurality of first gate lines are disposed on the first surface at intervals, the first adhesive is located outside the first gate lines and / or between adjacent first gate lines, the height of the first adhesive is equal to the height of the first gate lines, and a first transparent conductive layer is in electrical contact with the plurality of first gate lines. A second adhesive is disposed on a second surface; a plurality of second gate lines are disposed on the second surface at intervals, the second adhesive is located outside the second gate lines and / or between adjacent second gate lines, the height of the second adhesive is equal to the height of the second gate lines, and a second transparent conductive layer is in electrical contact with the plurality of second gate lines. Both the first adhesive and the second adhesive are transparent adhesives.

[0057] In the above technical solution, the present invention achieves electrical connection between the transparent conductive layer and the grid lines of the photovoltaic cell by setting the transparent adhesive, and avoids poor contact between the grid lines and the transparent conductive layer by limiting the height of the transparent adhesive and the grid lines, thus ensuring charge transfer between the grid lines and the transparent conductive layer.

[0058] This utility model also discloses a photovoltaic module including the aforementioned photovoltaic cell string.

[0059] The present invention will be further illustrated below with specific examples.

[0060] Example 1:

[0061] like Figures 1 to 4 As shown, the photovoltaic cell string in this embodiment includes two photovoltaic cells 100. Both photovoltaic cells 100 in this embodiment can be TOPCon photovoltaic cells.

[0062] In other embodiments, the photovoltaic cell can also be other types of cells, such as HJT cells (heterojunction cells), BC cells (back contact cells), PERC cells, etc.

[0063] like Figure 3 As shown, the TOPCon photovoltaic cell in this embodiment includes a first surface S1 and a second surface S2 disposed opposite to each other. The first surface S1 is the front side (i.e., the light-receiving surface) of the photovoltaic cell 100, and the second surface S2 is the back side (i.e., the backlighting surface) of the photovoltaic cell 100.

[0064] A plurality of first grid lines 101 are spaced apart on the first surface S1 of the photovoltaic cell 100. A first adhesive member 102 is disposed on the first surface S1 of the photovoltaic cell 100 in areas other than the first grid lines 101. In this embodiment, the first adhesive member 102 is a transparent strip-shaped adhesive member, disposed on the outer side of the plurality of first grid lines 101 and between adjacent first grid lines 101. That is, the first adhesive member 102 is disposed in the four edge areas of the first surface S1 of the photovoltaic cell 100 and in the areas between adjacent first grid lines 101. Preferably, the first adhesive member 102 is disposed as close as possible to the first grid lines 101. The height of the first adhesive member 102 is equal to the height of the first grid lines 101, and the width of the first adhesive member 102 ranges from 10μm to 30μm.

[0065] The first adhesive 102 can be made of transparent adhesive and formed on the first surface S1 by screen printing.

[0066] A plurality of second grid lines 201 are spaced apart on the second surface S2 of the photovoltaic cell 100. Second adhesive members 202 are disposed on the second surface S2 of the photovoltaic cell 100 in areas other than the second grid lines 201. In this embodiment, the second adhesive member 202 is a transparent strip-shaped adhesive member, disposed on the outer side of the plurality of second grid lines 201 and between adjacent second grid lines 201. That is, the second adhesive member 202 is disposed in the four edge areas of the second surface S2 of the photovoltaic cell 100 and in the areas between adjacent second grid lines 201. Preferably, the second adhesive member 202 is disposed as close as possible to the second grid lines 201. The height of the second adhesive member 202 is equal to the height of the second grid lines 201, and the width of the second adhesive member 202 ranges from 10μm to 30μm.

[0067] The material of the second adhesive 202 can be a transparent adhesive, which is formed on the second surface S2 by screen printing.

[0068] It is understood that, in other embodiments, the first adhesive 102 and the second adhesive 202 may also be transparent dot-shaped adhesives or transparent sheet-shaped adhesives, similarly disposed in the four edge regions of the two surfaces of the photovoltaic cell 100 and in the regions between adjacent grid lines. The heights of the first adhesive 102 and the second adhesive 202 are also consistent with the heights of the corresponding grid lines.

[0069] In other embodiments, the first adhesive 102 and the second adhesive 202 may also be disposed only on the four edge regions of the two surfaces of the photovoltaic cell 100, or only in the region between adjacent grid lines.

[0070] like Figure 1 As shown, the first interconnect structure 200 includes a first transparent conductive layer 201 and a first conductive connector 202. The first transparent conductive layer 201 is disposed on the first surface S1 of the photovoltaic cell 100 and is in electrical contact with the first grid line 101 on the first surface S1 of the photovoltaic cell 100 through the first adhesive 102. Maintaining a height substantially consistent with the height of the first adhesive 102 and the first grid line 101 avoids poor contact between the first grid line 101 and the first transparent conductive layer 201 located above it, ensuring charge transfer between the first grid line 101 and the first transparent conductive layer 201. The first transparent conductive layer 201 is preferably a transparent conductive film or transparent conductive glass. Preferably, the orthographic projection of the first transparent conductive layer 201 onto the first surface S1 of the photovoltaic cell 100 covers the photovoltaic cell 100, increasing the contact area between the first transparent conductive layer 201 and the first grid line 101, improving ohmic contact and fill factor, reducing shading area, and improving cell efficiency.

[0071] In other embodiments, the orthographic projection of the first transparent conductive layer 201 onto the first surface S1 of the photovoltaic cell 100 may also cover only the first grid line 101 on the first surface S1 of the photovoltaic cell 100.

[0072] The first conductive connector 202 is fixedly connected to and electrically contacts the first transparent conductive layer 201. After collecting current, the first grid line 101 on the first surface S1 of the photovoltaic cell 100 transmits it through the first transparent conductive layer 201 to the first conductive connector 202, and then through the first conductive connector 202 to the adjacent photovoltaic cell 100.

[0073] like Figure 4As shown, in this embodiment, the first transparent conductive layer 201 has a first extension 2011 extending outward from the first surface of the photovoltaic cell 100 relative to the photovoltaic cell 100. The first extension 2011 is a surface extension, which is part of the first transparent conductive layer 201 and integrally formed with the first transparent conductive layer 201. A first conductive connector 202 is disposed on the first extension 2011. Preferably, the first conductive connector 202 is disposed on the surface of the first extension 2011 of the first transparent conductive layer 201 facing the photovoltaic cell 100. There is a certain distance gap between the side of the first conductive connector 202 and the photovoltaic cell 100 to prevent short circuit.

[0074] The first conductive connector 202 is preferably a strip-shaped conductive connector. The length of the first conductive connector 202 is equal to the length of the corresponding side of the first transparent conductive layer 201 on which it is located. The thickness of the first conductive connector 202 is 0.05cm-0.5cm; the width of the first conductive connector 202 is 0.2cm-2cm.

[0075] like Figure 1 and Figure 2 As shown, in this embodiment, the series connection direction of the photovoltaic cell string is the short side direction of the photovoltaic cell. That is, the dimension of the photovoltaic cell along the extension direction of the photovoltaic cell string is the width of the photovoltaic cell, and the dimension of the photovoltaic cell along the direction perpendicular to the extension direction of the photovoltaic cell string is the length of the photovoltaic cell. The length of the first conductive connector 202 is the dimension W of the first conductive connector 202 along the length direction of the photovoltaic cell 100. 11 The length of the corresponding side of the first transparent conductive layer 201 is the length L1 of the first transparent conductive layer 201; the thickness of the first conductive connector 202 is the dimension W of the first conductive connector along the thickness direction of the photovoltaic cell. 12 The width of the first conductive connector 202 is the dimension W of the first conductive connector along the width direction of the photovoltaic cell. 13 .

[0076] like Figure 1As shown, the second interconnect structure 300 includes a second transparent conductive layer 301 and a second conductive connector 302. The second transparent conductive layer 301 is disposed on the second surface S2 of the photovoltaic cell 100 and is in electrical contact with the second grid line 201 on the second surface S2 of the photovoltaic cell 100 through the second adhesive 302. The height of the second adhesive 202 is substantially consistent with the height of the second grid line 201, which can avoid poor contact between the second grid line 201 and the second transparent conductive layer 301 located above it, and ensure charge transfer between the second grid line 201 and the second transparent conductive layer 301. The second transparent conductive layer 301 is preferably a transparent conductive film or a transparent conductive glass. The orthographic projection of the second transparent conductive layer 301 on the second surface S2 of the photovoltaic cell 100 covers the photovoltaic cell 100, which increases the contact area between the second transparent conductive layer 301 and the second grid line 201, improves ohmic contact and fill factor, reduces the shading area, and improves cell efficiency.

[0077] The second conductive connector 302 is fixedly connected to and electrically contacts the second transparent conductive layer 301. After collecting current, the second grid line 201 on the second surface S2 of the photovoltaic cell 100 transmits it to the second conductive connector 302 via the second transparent conductive layer 301, and then to the adjacent photovoltaic cell 100 via the second conductive connector 302.

[0078] like Figure 4 As shown, in this embodiment, the second transparent conductive layer 301 has a second extension 3011 extending outward from the second surface of the photovoltaic cell 100 relative to the photovoltaic cell 100. The second extension 3011 is a surface extension, which is part of the second transparent conductive layer 301 and integrally formed with the second transparent conductive layer 301. A second conductive connector 302 is disposed on the second extension 3011. The extension direction of the second extension 3011 is opposite to the extension direction of the first extension 2011. Preferably, the second conductive connector 302 is disposed on the surface of the second extension 3011 of the second transparent conductive layer 301 facing the photovoltaic cell 100. There is a certain distance gap between the side of the second conductive connector 302 and the photovoltaic cell 100 to prevent short circuit.

[0079] It is understood that in other embodiments, the extension direction of the second extension 3011 may not be opposite to the extension direction of the first extension 2011, but the extension directions may be different.

[0080] The second conductive connector 302 is preferably a strip-shaped conductive connector, and the length of the second conductive connector 302 is equal to the length of the corresponding side of the second transparent conductive layer 301 to which it is located. The thickness of the second conductive connector 302 is 0.05cm-0.5cm; the width of the second conductive connector 302 is 0.2cm-2cm.

[0081] like Figure 1 and Figure 2 As shown, in this embodiment, the series connection direction of the photovoltaic cell string is the short side direction of the photovoltaic cell. That is, the dimension of the photovoltaic cell along the extension direction of the photovoltaic cell string is the width of the photovoltaic cell, and the dimension of the photovoltaic cell along the direction perpendicular to the extension direction of the photovoltaic cell string is the length of the photovoltaic cell. The length of the second conductive connector 302 is the dimension W of the second conductive connector 302 along the length direction of the photovoltaic cell 100. 21 The length of the corresponding side of the second transparent conductive layer 301 is the length L2 of the second transparent conductive layer 301; the thickness of the second conductive connector 302 is the dimension W of the second conductive connector along the thickness direction of the photovoltaic cell. 22 The width of the second conductive connector 302 is the dimension W of the second conductive connector along the width direction of the photovoltaic cell. 23 .

[0082] In this embodiment of the photovoltaic cell string, the first conductive connector 202 on one photovoltaic cell 100 is in electrical contact with the second conductive connector 302 on another photovoltaic cell 100, thus realizing the series connection between the two photovoltaic cells 100.

[0083] To facilitate the interconnection and separation of photovoltaic cells 100, both the first conductive connector 202 and the second conductive connector 302 are magnetic conductive connectors, such as magnetic strips; and the contact ends of the first conductive connector 202 and the second conductive connector 302 have opposite magnetic properties. The magnetic conductive connectors allow a single photovoltaic cell module, composed of an individual photovoltaic cell 100 and its corresponding first interconnection structure 200 and second interconnection structure 300, to be easily separated from its corresponding photovoltaic cell string. This facilitates the repair or replacement of damaged individual photovoltaic cell modules during the actual operation of the photovoltaic cell string, reducing overall replacement losses. A photovoltaic cell string can be assembled from multiple individual photovoltaic cell modules, allowing for flexible module design changes. Furthermore, due to the smaller size of individual photovoltaic cell modules, equipment and production costs can be significantly reduced in the manufacturing process, and the manufacturing process can be more refined, increasing the yield.

[0084] It is understood that in other embodiments, the photovoltaic cell string may further include three or more photovoltaic cells interconnected. Each photovoltaic cell has a first interconnection structure and a second interconnection structure on its first and second surfaces. Adjacent photovoltaic cells are electrically connected through a first conductive connector of the first interconnection structure and / or a second conductive connector of the second interconnection structure.

[0085] Example 2:

[0086] like Figure 5 As shown, the photovoltaic cell string in this embodiment has a structure that is roughly the same as that in embodiment 1. The difference is that in embodiment 1, the first conductive connector 202 is disposed on the surface of the first extension 2011 of the first transparent conductive layer 201 facing the photovoltaic cell 100, and the second conductive connector 302 is disposed on the surface of the second extension 3011 of the second transparent conductive layer 301 facing the photovoltaic cell 100.

[0087] In this embodiment, the first conductive connector 202 is disposed on the side of the first extension 2011 of the first transparent conductive layer 201. The side of the first conductive connector 202 is in contact with the side of the first transparent conductive layer 201. Preferably, the surface of the first conductive connector 202 facing away from the second conductive connector 302 is flush with the surface of the first transparent conductive layer 201 facing away from the photovoltaic cell 100. The second conductive connector 302 is disposed on the side of the second extension 3011 of the second transparent conductive layer 301. The side of the second conductive connector 302 is in contact with the side of the second transparent conductive layer 301. Preferably, the surface of the second conductive connector 302 facing away from the first conductive connector 202 is flush with the surface of the second transparent conductive layer 301 facing away from the photovoltaic cell 100.

[0088] In this embodiment, the cross-section of the first conductive connector 202 is square, and the cross-section of the second conductive connector 302 is square.

[0089] It is understood that in other embodiments, the cross-section of the first conductive connector 202 is L-shaped, and the cross-section of the second conductive connector 302 is square. Alternatively, the cross-section of the first conductive connector 202 is square, and the cross-section of the second conductive connector 302 is L-shaped. Or, the cross-section of the first conductive connector 202 is L-shaped, and the cross-section of the second conductive connector 302 is also L-shaped.

[0090] Example 3:

[0091] like Figure 6 As shown, the photovoltaic cell string in this embodiment has a structure that is roughly the same as that in embodiment 1. The difference is that in embodiment 1, the first conductive connector 202 is disposed on the surface of the first extension 2011 of the first transparent conductive layer 201 facing the photovoltaic cell 100, and the second conductive connector 302 is also disposed on the surface of the second extension 3011 of the second transparent conductive layer 301 facing the photovoltaic cell 100.

[0092] In this embodiment, the first conductive connector 202 is disposed on the surface of the first extension 2011 of the first transparent conductive layer 201 facing the photovoltaic cell 100, while the second conductive connector 302 is disposed on the side of the second extension 3011 of the second transparent conductive layer 301. Preferably, the surface of the second conductive connector 302 facing away from the first conductive connector 202 is flush with the surface of the second transparent conductive layer 301 facing away from the photovoltaic cell 100. The cross-section of the first conductive connector 202 is square, and the cross-section of the second conductive connector 302 is square or L-shaped.

[0093] It is understood that in other embodiments, the second conductive connector 302 is disposed on the surface of the second extension 3011 of the second transparent conductive layer 301 facing the photovoltaic cell 100, while the first conductive connector 202 is disposed on the side of the first extension 2011 of the first transparent conductive layer 201. Preferably, the surface of the first conductive connector 202 facing away from the second conductive connector 302 is flush with the surface of the first transparent conductive layer 201 facing away from the photovoltaic cell 100. The cross-section of the second conductive connector 302 is square, and the cross-section of the first conductive connector 202 is L-shaped or square.

[0094] Example 4:

[0095] like Figure 7 As shown, the photovoltaic cell string in this embodiment has a structure that is largely the same as that in Embodiment 1. The difference is that in Embodiment 1, the first transparent conductive layer 201 has a first extension portion 2011 extending outward from above the photovoltaic cell 100 relative to the photovoltaic cell 100, and the first conductive connector 202 is disposed on the first extension portion 2011 of the first transparent conductive layer 201; the second transparent conductive layer 301 has a second extension portion 3011 extending outward from above the photovoltaic cell 100 relative to the photovoltaic cell 100, and the second conductive connector 302 is disposed on the second extension portion 3011.

[0096] In this embodiment, the first transparent conductive layer 201 does not have a first extension portion extending outward from above the photovoltaic cell 100 relative to the photovoltaic cell 100, and the second transparent conductive layer 301 also does not have a second extension portion extending outward from above the photovoltaic cell 100 relative to the photovoltaic cell 100. That is, the size of the first transparent conductive layer 201 and the second transparent conductive layer 301 is consistent with the size of the photovoltaic cell.

[0097] In this embodiment, the first conductive connector 202 is disposed on the side surface of the first transparent conductive layer 201, and the side surface of the first conductive connector 202 is in contact with the side surface of the first transparent conductive layer 201. Preferably, the surface of the first conductive connector 202 facing away from the second conductive connector 302 is flush with the surface of the first transparent conductive layer 201 facing away from the photovoltaic cell 100. The second conductive connector 302 is disposed on the side surface of the second transparent conductive layer 301, and the side surface of the second conductive connector 302 is in contact with the side surface of the second transparent conductive layer 301. Preferably, the surface of the second conductive connector 302 facing away from the first conductive connector 202 is flush with the surface of the second transparent conductive layer 301 facing away from the photovoltaic cell 100.

[0098] In this embodiment, the cross-section of the first conductive connector 202 is L-shaped, and the cross-section of the second conductive connector 302 is also L-shaped.

[0099] It is understood that in other embodiments, the cross-section of the first conductive connector 202 is L-shaped, and the cross-section of the second conductive connector 302 is square. Alternatively, the cross-section of the first conductive connector 202 is square, and the cross-section of the second conductive connector 302 is L-shaped.

[0100] It is understood that the photovoltaic cells in the photovoltaic cell string of this invention are battery structures without main grid lines, that is, there are no main grid line electrodes (bus bars) on the light-receiving and back-light-receiving surfaces of the photovoltaic cells, only a number of parallel fine grid line electrodes (first grid line and second grid line). In the photovoltaic cell string of this invention, since the current collector has changed from traditional welding wires and busbars to a transparent conductive layer and conductive connectors, the fine grid line electrodes on the photovoltaic cells are no longer limited to the traditional number and pattern design. Optically optimized designs can be adopted to meet optical improvement needs, thereby increasing the fill factor; special aesthetic requirements can also be met by customizing special grid line designs.

[0101] Compared with existing technologies, the photovoltaic cell string and photovoltaic module of this invention, by setting an interconnection structure composed of a transparent conductive layer and conductive connectors on the surface of the photovoltaic cell, replaces traditional current collectors such as solder ribbon, copper foil, and aluminum foil. This can improve ohmic contact, increase fill factor, and improve cell efficiency while reducing shading area and cost.

[0102] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0103] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A string of photovoltaic cells, characterized in that, include: At least two photovoltaic cells, each of which has a first surface and a second surface disposed opposite to each other; The first interconnection structure includes a first transparent conductive layer and a first conductive connector. The first transparent conductive layer is disposed on a first surface of the photovoltaic cell and is in electrical contact with the photovoltaic cell. The first conductive connector is in electrical contact with the first transparent conductive layer. The second interconnection structure includes a second transparent conductive layer and a second conductive connector. The second transparent conductive layer is disposed on the second surface of the photovoltaic cell and is in electrical contact with the photovoltaic cell. The second conductive connector is in electrical contact with the second transparent conductive layer. In this embodiment, a first conductive connector on one of the photovoltaic cells is in electrical contact with a second conductive connector on an adjacent photovoltaic cell.

2. The photovoltaic cell string of claim 1, wherein, Both the first conductive connector and the second conductive connector are magnetic conductive connectors, and the contact ends of the first conductive connector and the second conductive connector have opposite magnetic properties.

3. The photovoltaic cell string of claim 1, wherein, The first conductive connector is fixedly connected to the first transparent conductive layer; and / or, The second conductive connector is fixedly connected to the second transparent conductive layer.

4. The photovoltaic cell string of claim 1, wherein, The first transparent conductive layer has a first extension portion extending outward from the first surface of the photovoltaic cell, and the first conductive connector is disposed in the first extension portion; The second transparent conductive layer has a second extension extending outward from the second surface of the photovoltaic cell, and the second conductive connector is disposed in the second extension; The first extension and the second extension extend in different directions.

5. The photovoltaic cell string of claim 4, wherein, The first extension and the second extension extend in opposite directions.

6. The photovoltaic cell string of claim 1, wherein, The first conductive connector is disposed on the side of the first transparent conductive layer or on the surface of the first transparent conductive layer facing the photovoltaic cell; and / or, The second conductive connector is disposed on the side of the second transparent conductive layer or on the surface of the second transparent conductive layer facing the photovoltaic cell.

7. The photovoltaic cell string of claim 1, wherein, The side of the first conductive connector contacts the side of the first transparent conductive layer, and the surface of the first conductive connector facing away from the second conductive connector is flush with the surface of the first transparent conductive layer facing away from the photovoltaic cell; or, the surface of the first conductive connector facing away from the second conductive connector contacts the surface of the first transparent conductive layer facing the photovoltaic cell; and / or, The side of the second conductive connector is in contact with the side of the second transparent conductive layer, and the surface of the second conductive connector facing away from the first conductive connector is flush with the surface of the second transparent conductive layer facing away from the photovoltaic cell; or, the surface of the second conductive connector facing away from the first conductive connector is in contact with the surface of the second transparent conductive layer facing the photovoltaic cell.

8. The photovoltaic cell string of claim 1, wherein, The first conductive connecting piece has a dimension W along the length direction of the photovoltaic cell piece 11 is equal to the length L1 of the first transparent conductive layer; and / or, the first conductive connection has a dimension W in the direction of the thickness of the photovoltaic cell piece 12 0.05 cm - 0.5 cm; and / or, the first conductive connection has a dimension W in the width direction of the photovoltaic cell piece 13 0.2 cm - 2 cm; and / or, the second conductive connection piece has a dimension W along the length direction of the photovoltaic cell piece 21 equal to the length L2 of the second transparent conductive layer; and / or, The second conductive connection has a dimension W in the direction of the thickness of the photovoltaic cell piece 22 0.05 cm - 0.5 cm; and / or, The second conductive connection has a dimension W in the width direction of the photovoltaic cell piece 23 0.2 cm - 2 cm.

9. The photovoltaic cell string of claim 1, wherein, A first adhesive is disposed on the first surface, and the first transparent conductive layer is fixedly disposed to the first surface of the photovoltaic cell by the first adhesive; and / or A second adhesive is provided on the second surface, and the second transparent conductive layer is fixedly disposed to the second surface of the photovoltaic cell through the second adhesive.

10. The photovoltaic cell string of claim 9, wherein, The first surface is provided with a plurality of first gate lines spaced apart, the first adhesive is located outside the first gate lines and / or between adjacent first gate lines, the height of the first adhesive is equal to the height of the first gate lines, and the first transparent conductive layer is in electrical contact with the plurality of first gate lines. The second surface is provided with a plurality of second gate lines spaced apart, the second adhesive is located outside the second gate lines and / or between adjacent second gate lines, the height of the second adhesive is equal to the height of the second gate lines, and the second transparent conductive layer is in electrical contact with the plurality of second gate lines.

11. The photovoltaic cell string of claim 9, wherein, Both the first adhesive and the second adhesive are transparent adhesives; and / or, The first adhesive is one of a strip adhesive, a dot adhesive, or a sheet adhesive; and / or, The second adhesive is one of a strip adhesive, a dot adhesive, or a sheet adhesive; and / or, The widths of both the first adhesive and the second adhesive are 10μm-30μm.

12. A photovoltaic module, characterized by Includes the photovoltaic cell string as described in any one of claims 1-11.

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