A flexible solar cell interconnection component and preparation method thereof

Abstract

The invention discloses a flexible solar cell interconnection component and a preparation method thereof, comprising a front plate, on which a front plate conductive grid line is arranged; a back plate, on which a back plate conductive grid line is arranged; a flexible solar cell sheet, which is sequentially adhered between the front plate and the back plate, the front plate conductive grid line is connected to the lower surface electrode of the flexible solar cell sheet, the back plate conductive grid line is connected to the upper surface electrode of the flexible solar cell sheet, and a plurality of battery units are interconnected by overlapping to form a flexible solar cell group; an electrode lead-out grid line I and an electrode lead-out grid line II, which are respectively used to lead out two electrodes of the flexible solar cell group, the electrode lead-out grid line I and the electrode lead-out grid line II are respectively connected to the two electrodes of the flexible solar cell group, and the electrode lead-out grid line I and the electrode lead-out grid line II can be located on the front plate or on the back plate; the battery component improves the accuracy of battery sheet interconnection and increases the stability of the flexible component.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible solar cell interconnection, and more specifically, the present invention relates to a flexible solar cell interconnection component and a preparation method thereof. Background Art

[0002] Conventional flexible solar cell interconnection components are divided into internal interconnection and external interconnection. The present invention relates to an external interconnection solar cell. The traditional external interconnection adopts laser welding or mechanical scribing to realize the interconnection of battery components. Such an interconnection method has obvious defects. Laser etching can easily cause short circuit of the battery, and the mechanical scribing method will increase the dead zone of the battery, affecting the battery efficiency. A domestic patent (CN103840024) discloses printing conductive grid lines on the battery cell and then overlapping and interconnecting the battery cells. The defect of this battery is that when the thickness of the flexible battery cell is small, direct overlap will cause a short circuit risk due to deformation of the metal edge. At the same time, direct overlap of the battery cell will reduce the light receiving area of ​​the solar cell. The flexible solar cell interconnection component provided by the present invention uses a new type of graphical front panel and back panel to completely avoid the above defects and more easily realize the interconnection between the battery cells. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0004] In order to achieve these objects and other advantages according to the present invention, a flexible solar cell interconnection assembly is provided, comprising:

[0005] A front plate, on which a plurality of front plate conductive grid lines are arranged;

[0006] A back plate, on which a plurality of back plate conductive grid lines are arranged;

[0007] A plurality of flexible solar cells are sequentially adhered between the front plate and the back plate, the front plate conductive grid line is overlapped with the negative electrode or the positive electrode of the flexible solar cell, the back plate conductive grid line is overlapped with the positive electrode or the negative electrode of the flexible solar cell, and a flexible solar cell, the front plate conductive grid line and the back plate conductive grid line form a battery unit; in two adjacent battery units, the back plate conductive grid line of one battery unit is overlapped with the front plate conductive grid line of another battery unit to realize the interconnection between the two battery units, and similarly, a plurality of battery units are overlapped and interconnected in the above manner to form a flexible solar cell group;

[0008] Electrode lead-out grid line I and electrode lead-out grid line II are respectively used to lead out two electrodes of the flexible solar cell group. The electrode lead-out grid line I and electrode lead-out grid line II are respectively connected to the two electrodes of the flexible solar cell group, and the electrode lead-out grid line I and electrode lead-out grid line II can be located on the front plate or on the back plate.

[0009] Preferably, the front panel conductive grid line is connected to the negative electrode of the flexible solar cell sheet, the back panel conductive grid line is connected to the positive electrode of the flexible solar cell sheet, the electrode lead grid line I is connected to the negative electrode of the last flexible solar cell sheet, and the electrode lead grid line II is connected to the back panel conductive grid line of the first flexible solar cell unit.

[0010] Preferably, the front panel conductive grid line is connected to the positive electrode of the flexible solar cell sheet, the back panel conductive grid line is connected to the negative electrode of the flexible solar cell sheet, the electrode lead grid line I is connected to the positive electrode of the last flexible solar cell sheet, and the electrode lead grid line II is connected to the back panel conductive grid line of the first flexible solar cell unit.

[0011] Preferably, a base film is arranged near the overlapping position of the front plate conductive grid lines and the back plate conductive grid lines, and the base films of the front plate and the back plate are bonded by a glue film or an adhesive; the front plate conductive grid lines and the back plate conductive grid lines are various patterned conductive grid lines.

[0012] Preferably, the overlapping mode of the front panel conductive grid lines and the back panel conductive grid lines can be edge overlapping, that is, the overlapping position of the front panel conductive grid lines and the back panel conductive grid lines is located at the edge of the flexible solar cell sheet.

[0013] Preferably, the overlapping mode of the front panel conductive grid lines and the back panel conductive grid lines can be gap overlapping, that is, the overlapping position of the front panel conductive grid lines and the back panel conductive grid lines is located in the middle of two adjacent flexible solar cell sheets.

[0014] Preferably, an insulating layer is provided between the front panel conductive grid lines and the edge of the flexible solar cell sheet, and at a local position where the back panel conductive grid lines contact the flexible solar cell sheet; and the insulating layer is an ink layer.

[0015] Preferably, the adjacent front panel conductive grid lines and back panel conductive grid lines may be bonded together by conductive adhesive or by direct overlapping.

[0016] Preferably, the method for preparing the flexible solar cell assembly comprises the following steps:

[0017] Step 1: placing a plurality of flexible solar cells on the front panel in sequence, and making the negative electrode or the positive electrode of the flexible solar cell overlap with the front panel conductive grid line on the front panel, and then attaching the flexible solar cell to the front panel by heat pressing;

[0018] Step 2: Place the backplane on the upper surface of the frontplane and the flexible solar cell sheet, so that the positive or negative electrode of the flexible solar cell sheet overlaps with the backplane conductive grid line on the backplane, and ensure that in two adjacent battery cells, the front plate conductive grid line of one battery cell overlaps with the back plate conductive grid line of another battery cell, and so on, multiple flexible solar cell units are interconnected in this way;

[0019] Step 3: Use heat pressing to bond the front panel, flexible solar cell sheet and back panel together, and the flexible solar cell interconnection assembly is completed.

[0020] Preferably, in step one and step three, the hot pressing temperature is 50-200° C., the air pressure is 0-100 atm, and the hot pressing time is 0.5 s-1 h; in step two, conductive glue is applied to the overlapping positions of the front panel conductive grid lines and the back panel conductive grid lines.

[0021] The present invention has at least the following beneficial effects:

[0022] (1) Reduce the requirements for manufacturing equipment, that is, avoid the use of laser welding equipment and mechanical scribing equipment;

[0023] (2) Improved the flexibility of flexible solar cell interconnection design. The interconnection points of the solar flexible cell can be located at any position of the flexible component, allowing designers to maximize the use of the light-receiving area, more flexibly design the cell size, and match the voltage and current to customer needs;

[0024] (3) It reduces the difficulty of manufacturing flexible components and simplifies the manufacturing process. The arrangement and routing of the battery cells of flexible components have always been a difficult point in manufacturing, especially when the component size is small, a millimeter-level deviation will cause the flexible component to fail. The present invention can easily realize the interconnection of battery cells through overlapping conductive grid lines. At the same time, the conductive grid lines are attached to the front plate and the back plate, and are interconnected by overlapping, which can avoid the displacement of the routing between the battery cells during the packaging process.

[0025] (4) Reduce product defects caused by wiring operations. The grid line overlap method of the front plate and the back plate is adopted to avoid the traditional cumbersome wiring work, improve the accuracy of battery cell interconnection, and avoid problems such as short circuits caused by improper wiring;

[0026] (5) The product stability of the flexible component is increased; the front panel and the back panel are nested and bonded, which reduces the wiring work. The overlapping position can be accurately aligned; at the same time, a film or adhesive is used near the overlapping position, and conductive glue is selectively added between the overlapping conductive grid lines to ensure ohmic contact at the overlapping position.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a front panel structure with edge overlaps in a flexible solar cell interconnection assembly provided by the present invention;

[0029] Figure 2 A schematic diagram of a backplane structure with edge overlaps used in a flexible solar cell interconnection assembly provided by the present invention;

[0030] Figure 3 A schematic diagram of the edge overlap structure of the flexible solar cell interconnection assembly provided by the present invention;

[0031] Figure 4 A schematic diagram of an edge overlap structure of a flexible solar cell interconnection assembly provided by the present invention

[0032] Figure 5 A schematic diagram of the structure of the gap overlap of the solar cell interconnection assembly provided by the present invention;

[0033] Figure 6 A schematic cross-sectional view of the edge overlap of the flexible solar cell interconnection assembly provided by the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be understood that terms such as “having”, “including” and “comprising” used herein do not specify the existence or addition of one or more other elements or combinations thereof.

[0036] like Figure 1-6 A flexible solar cell interconnection assembly of the present invention comprises:

[0037] A front panel 1, on which a plurality of front panel conductive grid lines 3 are arranged;

[0038] A back plate 2, on which a plurality of back plate conductive grid lines 4 are arranged;

[0039] A plurality of flexible solar cell sheets 8 are sequentially adhered between the front plate 1 and the back plate 2, the front plate conductive grid line 3 is overlapped with the negative electrode or the positive electrode of the flexible solar cell sheet 8, the back plate conductive grid line 4 is connected with the positive electrode or the negative electrode of the flexible solar cell sheet 8, and a flexible solar cell sheet 8 and the front plate conductive grid line 3 and the back plate conductive grid line 4 form a battery unit; in two adjacent battery units, the back plate conductive grid line 4 of one battery unit is overlapped with the front plate conductive grid line 3 of another battery unit to realize the interconnection between the two battery units. Similarly, a plurality of battery units are overlapped and interconnected in the above manner to form a flexible solar cell group;

[0040] The electrode lead-out grid line I6 and the electrode lead-out grid line II7 are respectively used to lead out the two electrodes of the flexible solar cell group. The electrode lead-out grid line I6 and the electrode lead-out grid line II7 are respectively connected to the two electrodes of the flexible solar cell group, and the electrode lead-out grid line I6 and the electrode lead-out grid line II7 can be located on the front panel 1 or on the back panel 2.

[0041] In the above technical solution, the front panel conductive grid lines 3 and the back panel conductive grid lines 4 are overlapped to realize the interconnection between the flexible solar cell sheets to form a flexible solar cell interconnection component, and the positive and negative electrodes of the flexible solar cell interconnection component are led out by the electrode lead grid lines I6 and the electrode lead grid lines II7.

[0042] In the above technical solution, if Figure 4 An edge overlap method of the flexible solar cell interconnection assembly shown in the figure, the front plate conductive grid line 31 is connected to the negative electrode of the flexible solar cell sheet 81, the back plate conductive grid line 41 is connected to the positive electrode of the flexible solar cell sheet 81, the electrode lead grid line I 61 is connected to the negative electrode of the last flexible solar cell sheet, and the electrode lead grid line II 71 is connected to the back plate conductive grid line of the first flexible solar cell unit; the front plate 1 and the back plate 2 of the battery assembly are attached together by hot pressing, the front plate conductive grid line 31 contacts the negative electrode surface of the flexible solar cell sheet for collecting the current of the flexible solar cell sheet, and the back plate conductive grid line 41 contacts the positive electrode of the flexible solar cell sheet for connecting The negative electrode of the previous flexible solar cell sheet 81 is connected to the positive electrode of the next flexible solar cell sheet, and the front plate conductive grid line 31 collects the collected current to the back plate conductive grid line 41. The adjacent back plate conductive grid lines 41 and the front plate conductive grid lines 3 are overlapped together. Finally, the collected current is led out of the battery group by the electrode lead-out grid line II 71, and the negative electrode of the flexible solar cell group is led out by the electrode lead-out grid line I 61. The front plate conductive grid lines and the back plate conductive grid lines of the battery assembly can be used to interconnect the flexible solar cells at any position of the battery packaging assembly. They can be overlapped between the flexible cells or on both sides of the edges of the flexible cells. The overlapping method is simple and the battery interconnection accuracy is high.

[0043] In another technical solution, the front panel conductive grid line is connected to the positive electrode of the flexible solar cell sheet, the back panel conductive grid line is connected to the negative electrode of the flexible solar cell sheet, the electrode lead grid line I is connected to the positive electrode of the last flexible solar cell sheet, and the electrode lead grid line II is connected to the back panel conductive grid line of the first flexible solar cell unit.

[0044] In the above technical solution, a base film 11 is arranged near the overlapping position of the front panel conductive grid lines 3 and the back panel conductive grid lines 4, and the base films of the front panel and the back panel are bonded by a glue film or an adhesive; the front panel conductive grid lines 3 and the back panel conductive grid lines 4 are various patterned conductive grid lines.

[0045] In another technical solution, the front plate conductive grid lines 3 and the back plate conductive grid lines 4 may be overlapped by edge overlap, that is, Figure 3 As shown, the overlapping position of the front plate conductive grid line 3 and the back plate conductive grid line 4 is located at the edge of the flexible solar cell sheet 8.

[0046] In another technical solution, the overlapping mode of the front plate conductive grid lines 3 and the back plate conductive grid lines 4 can be gap overlapping, that is, Figure 4 As shown, the overlapping position of the front plate conductive grid line 3 and the back plate conductive grid line 4 is located in the middle position 8 between two adjacent flexible solar cell sheets.

[0047] In the above technical solution, an insulating layer 5 is provided between the front panel conductive grid line 3 and the edge of the flexible solar cell sheet 8, and at the local position where the back panel conductive grid line 4 contacts the flexible solar cell sheet 8, and the insulating layer 5 is an ink layer; the use of the insulating layer can prevent the front panel conductive grid line 3 and the back panel conductive grid line 4 of the same battery unit from making electrical contact, thereby preventing the flexible solar cell sheet 3 from failing.

[0048] In the above technical solution, the adjacent front panel conductive grid lines and the back panel conductive grid lines can be bonded together by conductive glue, or by direct overlapping. The bonding method using conductive glue can result in a smaller resistance between the front panel conductive grid lines and the back panel conductive grid lines, thereby improving the utilization efficiency of each flexible solar cell 8.

[0049] Preferably, the method for preparing the flexible solar cell assembly comprises the following steps:

[0050] Step 1: placing a plurality of flexible solar cells on the front panel in sequence, and making the negative electrode or the positive electrode of the flexible solar cell overlap with the front panel conductive grid line on the front panel, and then attaching the flexible solar cell to the front panel by heat pressing;

[0051] Step 2: Place the backplane on the upper surface of the frontplane and the flexible solar cell sheet, so that the positive or negative electrode of the flexible solar cell sheet overlaps with the backplane conductive grid line on the backplane, and ensure that in two adjacent battery cells, the front plate conductive grid line of one battery cell overlaps with the back plate conductive grid line of another battery cell, and so on, multiple flexible solar cell units are interconnected in this way;

[0052] Step 3: Use heat pressing to bond the front panel, flexible solar cell sheet and back panel together, and the flexible solar cell interconnection assembly is completed.

[0053] In the above technical solution, in step 1 and step 3, the hot pressing temperature is 50-200°C, the air pressure is 0-100atm, and the hot pressing time is 0.5s-1h;

[0054] In the step 2, when overlapping the front plate conductive grid lines and the back plate conductive grid lines, conductive glue is applied to the overlapping positions of the front plate conductive grid lines and the back plate conductive grid lines.

[0055] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0056] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A flexible solar cell interconnection assembly, characterized in that: include: A front plate, on which a plurality of front plate conductive grid lines are arranged; A back plate, on which a plurality of back plate conductive grid lines are arranged; A plurality of flexible solar cells are sequentially adhered between the front plate and the back plate, the front plate conductive grid line is overlapped with the negative electrode or the positive electrode of the flexible solar cell, the back plate conductive grid line is overlapped with the positive electrode or the negative electrode of the flexible solar cell, and one flexible solar cell, the front plate conductive grid line and the back plate conductive grid line form a battery unit; in two adjacent battery units, the back plate conductive grid line of one battery unit is overlapped with the front plate conductive grid line of another battery unit to realize the interconnection between the two battery units, and similarly, a plurality of battery units are interconnected by overlapping to form a flexible solar cell group; Electrode lead-out grid lines I and II are respectively used to lead out two electrodes of the flexible solar cell group, the electrode lead-out grid lines I and the electrode lead-out grid lines II are respectively connected to the two electrodes of the flexible solar cell group, and the electrode lead-out grid lines I and the electrode lead-out grid lines II are located on the front plate or on the back plate; The overlapping mode of the front plate conductive grid lines and the back plate conductive grid lines is gap overlapping, that is, the overlapping position of the front plate conductive grid lines and the back plate conductive grid lines is located in the middle position of two adjacent flexible solar cell sheets; An insulating layer is provided between the conductive grid lines of the front plate and the edge of the flexible solar cell sheet, and at a local position where the conductive grid lines of the back plate contact the flexible solar cell sheet; the insulating layer is an ink layer; The adjacent front plate conductive grid lines and back plate conductive grid lines are connected by direct overlapping; The method for realizing flexible solar cell interconnection by a flexible solar cell interconnection assembly comprises the following steps: Step 1: placing a plurality of flexible solar cells on the front panel in sequence, and making the negative electrode or the positive electrode of the flexible solar cell overlap with the front panel conductive grid line on the front panel, and then attaching the flexible solar cell to the front panel by heat pressing; Step 2: Place the backplane on the upper surface of the frontplane and the flexible solar cell sheet, so that the positive or negative electrode of the flexible solar cell sheet overlaps with the backplane conductive grid line on the backplane, and ensure that in two adjacent battery cells, the front plate conductive grid line of one battery cell overlaps with the back plate conductive grid line of another battery cell, and so on, multiple flexible solar cell units are interconnected in this way; Step 3: Use heat pressing to bond the front panel, the flexible solar cell sheet and the back panel together, and the flexible solar cell interconnection assembly is interconnected and prepared; In the step 1 and the step 3, the hot pressing temperature is 50-200° C., the air pressure is 0-100 atm, and the hot pressing time is 0.5 s-1 h.

2. The flexible solar cell interconnection assembly according to claim 1, characterized in that: The front panel conductive grid line is connected to the negative electrode of the flexible solar cell sheet, the back panel conductive grid line is connected to the positive electrode of the flexible solar cell sheet, the electrode lead grid line I is connected to the negative electrode of the last flexible solar cell sheet, and the electrode lead grid line II is connected to the back panel conductive grid line of the first flexible solar cell unit.

3. The flexible solar cell interconnection assembly according to claim 1, characterized in that: The front panel conductive grid line is connected to the positive electrode of the flexible solar cell sheet, the back panel conductive grid line is connected to the negative electrode of the flexible solar cell sheet, the electrode lead grid line I is connected to the positive electrode of the last flexible solar cell sheet, and the electrode lead grid line II is connected to the back panel conductive grid line of the first flexible solar cell unit.

4. The flexible solar cell interconnection assembly according to claim 1, characterized in that: A base film is arranged near the overlapping position of the front plate conductive grid lines and the back plate conductive grid lines, and the base films of the front plate and the back plate are adhered by a glue film or an adhesive; the front plate conductive grid lines and the back plate conductive grid lines are various patterned conductive grid lines.

5. The flexible solar cell interconnection assembly according to claim 1, characterized in that: The overlapping mode of the front plate conductive grid lines and the back plate conductive grid lines is edge overlapping, that is, the overlapping position of the front plate conductive grid lines and the back plate conductive grid lines is located at the edge of the flexible solar cell sheet.

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