Flexible thin film solar power generation assembly

Abstract

The utility model relates to the field of solar cells, and provides a flexible film solar power generation assembly which comprises at least two solar cells and at least one connecting assembly used for connecting the solar cells. The connecting assembly comprises a first insulating tape, a second insulating tape and a conductive tape, the conductive tape and the first insulating tape are arranged between the two adjacent solar cells, and the conductive tape is used for communicating the two adjacent solar cells; and the second insulated rubber tape is arranged on the light receiving surfaces of the two adjacent solar cells and is used for connecting the two adjacent solar cells. The flexible thin-film solar power generation assembly is used for overcoming the defects that an existing flexible thin-film solar power generation assembly is not high in connection reliability, complex in process, high in cost and the like, the reliability of electrical connection between flexible thin-film solar cell chips can be enhanced, and power loss caused by short circuit between adjacent chips is effectively avoided. The process is simplified; and the manufacturing cost of the solar power generation assembly is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to solar cell technical field especially relates to a flexible thin film solar power generation assembly. BACKGROUND

[0002] Flexible thin film solar cell has the characteristics of light, thin, flexible and tough, and the product can be curled and folded, and the product is light in weight, small in size and solid in structure, and is widely used in various distributed photovoltaic power stations and mobile power products requiring light components.

[0003] There are various methods for the electrical connection of the battery chip inside the flexible thin film solar power generation assembly, such as pressure bonding metal grid line connection, soldering tin copper strip connection and pasting metal foil connection, but all have some drawbacks, such as the reliability problem of pressure bonding metal grid line, the process complexity and cost problem of soldering tin copper strip and pasting metal foil, etc. These on the one hand reduce the effective utilization rate of the power generation assembly per unit area, and on the other hand reduce the reliability of the flexible thin film solar power generation assembly in use, thereby reducing the power and service life of the flexible thin film solar power generation assembly and increasing the manufacturing cost of the power generation assembly. SUMMARY

[0004] The utility model provides a flexible thin film solar power generation assembly to solve the existing flexible thin film solar power generation assembly has the defects of low connection reliability, complex process and high cost, and the scheme of the application can enhance the reliability of the electrical connection between the flexible thin film solar cell chips, effectively avoid the short circuit between adjacent chips and loss of power, and at the same time simplify the process and reduce the manufacturing cost of the flexible thin film solar power generation assembly.

[0005] The utility model provides a flexible thin film solar power generation assembly, at least two solar cell pieces and at least one are used for connecting the connecting assembly of solar cell piece,

[0006] The connecting assembly includes first insulating adhesive tape, second insulating adhesive tape and conductive adhesive tape, the conductive adhesive tape is arranged between two adjacent solar cell pieces with the first insulating adhesive tape, and the conductive adhesive tape is used to connect two adjacent solar cell pieces;

[0007] The second insulating adhesive tape is arranged on the light receiving surface of two adjacent solar cell pieces and is used to connect two adjacent solar cell pieces, wherein the second insulating adhesive tape includes first section, second section and third section, the first section and the third section are connected with two adjacent solar cell pieces respectively, the second section connects the first section and the third section, the plane where the second section is located is perpendicular to the plane where the first section is located, and the plane where the second section is located is perpendicular to the plane where the third section is located.

[0008] The conductive adhesive tape is arranged between the first insulating adhesive tape and the second segment of the second insulating adhesive tape.

[0009] According to the flexible thin-film solar power generation assembly, the grid lines are arranged on the light-receiving surface of the solar cell piece.

[0010] The grid lines are used for transmitting the current generated by the solar cell piece.

[0011] According to the flexible thin-film solar power generation assembly, the grid lines include horizontal grid lines and vertical grid lines.

[0012] The horizontal grid lines have a width greater than or equal to that of the vertical grid lines.

[0013] The vertical grid lines are perpendicular to the horizontal grid lines.

[0014] According to the flexible thin-film solar power generation assembly, the edges of the solar cell piece are marked with insulating lines, and the conductive adhesive tape and the grid lines are arranged within the range of the insulating lines.

[0015] The insulating lines are 0.2 to 2 mm away from the edges of the solar cell piece.

[0016] The insulating lines are obtained by removing a transparent conductive film layer on the solar cell piece by laser marking, and the width of the insulating lines is 30 to 200 microns.

[0017] According to the flexible thin-film solar power generation assembly, the solar cell piece includes a metal substrate, and the electrode polarity of the metal substrate is opposite to that of the grid lines.

[0018] In the flexible thin-film solar power generation assembly, the solar cell pieces can be fixed by the first insulating adhesive tape and the second insulating adhesive tape, the selection of the insulating adhesive tape can improve the safety of the cell pieces and reduce the risk of short circuit, the first insulating adhesive tape is arranged between the solar cell pieces to fix the solar cell pieces from the inside, the second insulating adhesive tape is arranged on the surface of the solar cell pieces to fix the solar cell pieces from the outside, the double fixing mode can improve the stability of the connection of the solar cell pieces, and in addition, since the conductive adhesive tape is arranged between the first insulating adhesive tape and the second insulating adhesive tape, the two insulating adhesive tapes not only can fix the solar cell pieces, but also can protect the conductive adhesive tape, thereby further reducing the risk of short circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 is one of the structural schematic diagrams of the flexible thin-film solar power generation assembly provided by the embodiments of the present application.

[0021] Figure 2 is another structural schematic diagram of the flexible thin-film solar power generation assembly provided by the embodiments of the present application.

[0022] Figure 3 is a third structural schematic diagram of the flexible thin-film solar power generation assembly provided by the embodiments of the present application.

[0023] Figure 4 is a fourth structural schematic diagram of the flexible thin-film solar power generation assembly provided by the embodiments of the present application.

[0024] Among them:

[0025] 1-first insulating tape; 2-second insulating tape; 3-conductive tape;

[0026] 4-horizontal grid line; 5-vertical grid line; 6-insulating line;

[0027] 7-light receiving surface; 8-metal substrate. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] Figure 1 is one of the structural schematic diagrams of the flexible thin-film solar power generation assembly provided by the embodiments of the present application.

[0030] As Figure 1 shown, the present embodiment provides a flexible thin-film solar power generation assembly, which comprises at least two solar cell pieces and at least one connecting assembly for connecting the solar cell pieces.

[0031] The connecting assembly includes a first insulating tape 1, a second insulating tape 2, and a conductive tape 3. The conductive tape 3 and the first insulating tape 1 are disposed between two adjacent solar cells, and the conductive tape 3 is used to connect the two adjacent solar cells.

[0032] The second insulating tape 2 is disposed on the light-receiving surface of two adjacent solar cells for connecting the two adjacent solar cells. The second insulating tape 2 includes a first segment, a second segment, and a third segment. The first segment and the third segment are respectively connected to the two adjacent solar cells. The second segment connects the first segment and the third segment. The plane of the second segment is perpendicular to the plane of the first segment and the plane of the third segment.

[0033] The conductive tape 3 is disposed between the first insulating tape 1 and the second segment of the second insulating tape 2.

[0034] The types of flexible thin-film solar cells in this embodiment include, but are not limited to, copper indium gallium selenide thin-film solar cells, copper zinc tin sulfide thin-film solar cells, cadmium telluride thin-film solar cells, perovskite thin-film solar cells, and amorphous silicon thin-film solar cells.

[0035] During implementation, such as Figure 1 As shown, two adjacent solar cells can be stacked, meaning one solar cell rests on top of the other, and the width of the overlapping area can be 1-6 millimeters. Figure 1 The example flexible thin-film solar power generation module, from left to right, includes a first solar cell, a second solar cell, and a third solar cell. The first solar cell is placed on top of the second solar cell, and the first and second solar cells are connected by a first insulating tape 1, a second insulating tape 2, and a conductive tape 3. It can be seen that the first insulating tape 1 is positioned to the left of the conductive tape 3 and protrudes from the second solar cell, while the second insulating tape 2 is positioned to the right of the conductive tape 3. Thus, the conductive tape 3 is effectively protected between the first insulating tape 1 and the second insulating tape 2, which largely mitigates the risk of short circuits in the conductive tape 3. Simultaneously, the first insulating tape 1 protruding from the second solar cell also prevents direct contact between the metal substrates of the first and second solar cells during bending and winding, thus avoiding short circuits.

[0036] In practical applications, the thickness of the conductive tape 3 can be 20-200 micrometers, and the width can be 0.5-5 millimeters. The thickness of the first insulating tape 1 can be less than or equal to the thickness of the conductive tape 3, and the thickness of the first insulating tape 1 can be greater than 15 micrometers.

[0037] The conductive tape 3 is adjacent to the first insulating tape 1, and the distance between the two can be no more than twice the thickness of the conductive tape 3.

[0038] The width of the second insulating adhesive tape 2 can be 3-6mm.

[0039] In the embodiment, the first section, the second section and the third section of the second insulating adhesive tape 2 can be a part of the second insulating adhesive tape 2, and the first section, the second section and the third section in the embodiment can represent the "Z" type pasting mode of the second insulating adhesive tape 2, which can maximize the pasting area while ensuring the power generation efficiency, thereby improving the connection stability between the solar cell pieces.

[0040] In the flexible thin-film solar power generation assembly provided by the embodiment, the solar cell pieces can be pasted and fixed by the first insulating adhesive tape 1 and the second insulating adhesive tape 2, and the selection of the insulating adhesive tape can improve the safety of the cell pieces and reduce the risk of short circuit, wherein the first insulating adhesive tape 1 is arranged between the solar cell pieces to fix the solar cell pieces from the inside, and the second insulating adhesive tape 2 is arranged on the surface of the solar cell pieces to fix the solar cell pieces from the outside, and the double fixing mode can improve the stability of the connection of the solar cell pieces, and in addition, since the conductive adhesive tape 3 is arranged between the first insulating adhesive tape 1 and the second insulating adhesive tape 2, the two insulating adhesive tapes arranged can not only fix the solar cell pieces, but also play a protective role on the conductive adhesive tape 3, thereby further reducing the risk of short circuit.

[0041] In the example embodiment, the light-receiving surface of the solar cell piece is provided with a grid line;

[0042] The grid line is used for transmitting the current generated by the solar cell piece.

[0043] The grid line refers to a conductive structure of a grid electrode of a cell piece formed by printing a conductive material on the surface of a transparent conductive film of a light-receiving surface 7 of a thin-film solar cell, which can be used for collecting and transmitting photo-generated carriers, thereby transmitting the electric energy of the solar cell piece and realizing the conversion of solar energy into electric energy.

[0044] Figure 2 Fig. 2 is a structure schematic view of the flexible thin-film solar power generation assembly according to the embodiment of the present application.

[0045] Figure 3 Fig. 3 is a structure schematic view of the flexible thin-film solar power generation assembly according to the embodiment of the present application.

[0046] As shown in Figs. Figure 2 and Figure 3 In the example embodiment, the grid line includes a horizontal grid line 4 and a vertical grid line 5;

[0047] The horizontal grid line 4 and the vertical grid line 5 are arranged on the light-receiving surface of the solar cell piece;

[0048] The longitudinal grid line 5 is perpendicular to the transverse grid line 4;

[0049] The width of the horizontal grid line is greater than or equal to the width of the vertical grid line, that is, the width of the horizontal grid line 4 can be greater than the width of the vertical grid line 5, or it can be the same as the width of the vertical grid line 5.

[0050] In practical applications, the horizontal gate line 4 and the vertical gate line 5 can be conductive silver paste gate lines. The thickness of the gate lines can be 50-200 micrometers, the width of the horizontal gate line can be 0.02-2 mm, the width of the vertical gate line 5 can be 0.02-0.1 mm, and the spacing of the vertical gate lines 5 can be 2-6 mm.

[0051] like Figure 2 and Figure 3 As shown, the solar cell in this embodiment is provided with horizontal grid lines and vertical grid lines. The vertical grid lines are distributed throughout the entire solar cell. The horizontal grid lines are equivalent to the main circuit in the circuit, and the vertical grid lines are equivalent to the branch circuit. All the photogenerated carriers on the solar cell collected by the vertical grid lines are gathered on the horizontal grid lines and then transmitted uniformly through the horizontal grid lines. This can improve the efficiency of photogenerated carrier transmission.

[0052] In this embodiment, the grid line material includes, but is not limited to, silver paste, silver-coated copper paste, copper paste, and graphene paste.

[0053] In practical applications, the front surface of the solar cell has a transparent conductive film, and the grid lines are printed on the transparent conductive film. When conductive tape is attached to the front surface of the solar cell, because the width of the conductive tape is greater than the width of the grid lines, the conductive tape will simultaneously contact the transparent conductive film, the horizontal grid lines, and the vertical grid lines, ensuring current collection. Therefore, the width of the horizontal grid lines can be reduced to be the same as that of the vertical grid lines, i.e., a design without main grid lines. This reduces the amount of conductive paste (usually expensive silver paste) used, saving manufacturing costs for flexible thin-film solar power modules.

[0054] Figure 4 This is the fourth structural schematic diagram of the flexible thin-film solar power generation module provided in this embodiment of the present invention.

[0055] like Figure 4 As shown in the exemplary embodiment, the solar cell has an insulating line 6 etched on it; the conductive tape and the grid lines are disposed within the insulating line area;

[0056] The insulating wire is 0.2 to 2 mm away from the edge of the solar cell;

[0057] The insulating line is created by laser scribing to remove the transparent conductive film layer on the solar cell, and the width of the insulating line is 30 to 200 micrometers.

[0058] The embodiment takes the grid line including the transverse grid line 4 and the longitudinal grid line 5 as an example to illustrate the setting mode of the insulating line 6 on the solar cell piece, as shown in Figure 4 It can be seen that the insulating line 6 is arranged on the four peripheral edges of the solar cell piece, and the conductive adhesive tape 3 and the grid line do not exceed the range framed by the four peripheral insulating lines 6. The insulating line 6 is removed by laser scribing the transparent conductive film layer at the position on the solar cell piece. In this way, the solar cell piece can form an independent power generation unit, and the short circuit problem caused by the quality problems such as the curling and burr of part of the structure on the solar cell piece can be avoided, thereby improving the reliability and safety of the flexible thin-film solar power generation assembly.

[0059] In actual application, the distance between the insulating line 6 and the edge of the solar cell piece can be 0.2 to 2 mm, and the width of the insulating line 6 can be 30 to 200 microns, which is scribed by laser scribing once or multiple times to ensure the line width. In the exemplary embodiment, the solar cell piece includes a metal substrate 8, and the electrode polarity of the metal substrate 8 is opposite to the electrode polarity of the grid line.

[0060] The substrate of the thin-film solar cell piece refers to the base on which the material of the solar cell, such as copper indium gallium selenide and perovskite, is grown to form a solar cell. The metal substrate 8 in the embodiment can be stainless steel foil, copper foil and titanium foil, etc., and the thickness can be 20-200 microns, which has the advantages of good flexibility, good conductivity and good chemical stability, and can withstand high temperature.

[0061] The metal substrate 8 in the embodiment can be used as an electrode, and the grid line is used as another electrode. By pasting the conductive adhesive tape 3 and the insulating adhesive tape between the solar cell pieces, the positive and negative electrical connections between the metal substrate 8 of the solar cell piece and the grid line of another cell piece can be realized.

[0062] The device embodiments described above are only schematic, and the units illustrated as separate components can or can not be physically separate, and the components illustrated as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement it without creative labor.

[0063] Those skilled in the art can clearly understand the implementation of the various embodiments by means of software and necessary general hardware platforms through the description of the above embodiments, and of course, the various embodiments can also be implemented by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, and the computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method of each embodiment or some parts of the embodiment.

[0064] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application.

Claims

1. A flexible thin-film solar power generation module, characterized in that, It includes at least two solar cells and at least one connection component for connecting the solar cells; The connecting assembly includes a first insulating tape, a second insulating tape, and a conductive tape. The conductive tape and the first insulating tape are disposed between two adjacent solar cells, and the conductive tape is used to connect the two adjacent solar cells. The second insulating tape is disposed on the light-receiving surface of two adjacent solar cells to connect the two adjacent solar cells. The second insulating tape includes a first segment, a second segment, and a third segment. The first segment and the third segment are respectively connected to two adjacent solar cells. The second segment connects the first segment and the third segment. The plane of the second segment is perpendicular to the plane of the first segment and the plane of the third segment. The conductive tape is disposed between the first insulating tape and the second segment of the second insulating tape.

2. The flexible thin-film solar power generation module according to claim 1, characterized in that, The solar cell's light-receiving surface is provided with grid lines; The grid lines are used to transmit the current generated by the solar cell.

3. The flexible thin-film solar power generation module according to claim 2, characterized in that, The grid lines include horizontal grid lines and vertical grid lines; The width of the horizontal grid line is greater than or equal to the width of the vertical grid line; The longitudinal grid line is perpendicular to the transverse grid line.

4. The flexible thin-film solar power generation module according to claim 2, characterized in that, The edge of the solar cell is engraved with an insulating line, and the conductive tape and the grid line are disposed within the range of the insulating line; The insulating wire is 0.2 to 2 mm away from the edge of the solar cell; The insulating line is created by laser scribing to remove the transparent conductive film layer on the solar cell, and the width of the insulating line is 30 to 200 micrometers.

5. The flexible thin-film solar power generation module according to claim 2, characterized in that, The solar cell includes a metal substrate, the electrode polarity of which is opposite to that of the grid lines.

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