CN110137303A - It is sliced cell piece and overlaps method - Google Patents

Abstract

The present application discloses a method for overlapping sliced cells, which includes the following steps: sequentially stacking ribbons and second sliced cells on a first sliced cell, so that the first sliced cell and the second sliced cell are There is an overlapping area in the orthographic projection on the plane where the ribbon is located, wherein the ribbon is located between the first sliced cell and the second sliced cell, the non-cut surface of the first sliced cell and the cut surface of the second sliced cell The surface is located in the overlapping area, and the negative electrode of the first sliced cell and the negative electrode of the second sliced cell face up, which can reduce the possibility of deformation and cracks of the sliced cell during the lamination process, and reduce the cracks of the sliced cell Rate.

Description

Overlapping method of sliced cells

technical field

The present invention generally relates to the field of photovoltaics, specifically to the field of cell interconnection, and in particular to a method for overlapping sliced cells.

Background technique

At present, half photovoltaic cells are cut into half cells by dicing machine. The cutting part of the cell is the cut surface, and the opposite surface is the non-cut surface. Photovoltaic half-cell module is a product that is connected by welding ribbon. The battery string is formed by welding the ribbon from the front of the cell to the back of the adjacent cell by soldering in series, and a certain spacing between the connected cells is set (spacing > 0mm) . There are photovoltaic half-cell modules with inter-sheet spacing in the industry. When welding, the ribbon extends from the front of the half-sheet to the back of the adjacent sheet. The ribbon has both cutting and non-cutting surfaces at the end of the front.

With the rapid development of the photovoltaic industry, the demand for new products continues to increase. At this stage, customers' requirements for the efficiency of photovoltaic modules are constantly increasing, and the spacing between cells is canceled, and overlapping between cells has gradually become a trend. However, after the cells are overlapped and welded, the rate of hidden cracks at the overlap of the cells increases during the lamination process.

Contents of the invention

In view of the above defects or deficiencies in the prior art, it is desired to provide a method for overlapping sliced cells that reduces the hidden crack rate of sliced cells.

In the first aspect, the method for overlapping sliced cells of the present invention includes the following steps:

On the first sliced cell, the ribbon and the second sliced cell are sequentially stacked, so that the orthographic projections of the first sliced cell and the second sliced cell on the plane where the soldered ribbon is located have an overlapping area, wherein the soldered ribbon is located at Between the first sliced cell and the second sliced cell, the non-cut surface of the first sliced cell and the cut surface of the second sliced cell are located in the overlapping area, and the negative electrode of the first sliced cell and the second sliced cell The negative electrodes of the battery slices are facing up;

Welding the first sliced battery slice and the second sliced battery slice to the ribbon respectively to obtain the battery slice layer;

Laminate the glass layer and the first adhesive film layer in sequence, turn the cell layer over to the side of the first adhesive film layer facing away from the glass layer, and continue to laminate the second adhesive layer on the side of the battery sheet layer facing away from the first adhesive film layer The film layer and the back sheet layer are laminated by applying lamination pressure to the back sheet layer, wherein the negative electrode of the second slice battery faces the glass layer.

According to the technical solution provided by the embodiment of the present application, the ribbons and the second battery slices are sequentially stacked on the first battery slice, and the cutting surface of the first battery slice and the non-cutting surface of the second battery slice are located at the overlapping area, when laminating the battery slices, the non-cut surface of the first sliced battery slice faces the pressure side, that is, the lamination pressure is applied to the non-cut surface of the first sliced battery slice, and the first sliced battery slice The non-cutting surface of the second battery slice is not damaged by cutting, and the pressure bearing capacity is relatively strong; during the lamination process of the cutting surface of the second sliced battery piece, the welding ribbon will have a pressing force on the cut surface of the second sliced battery piece, and the second sliced battery piece Between the battery sheet and the glass is the first adhesive film layer, which can relieve the pressure on the cut surface of the second sliced battery sheet, and the side of the non-cut surface of the first sliced battery sheet is the pressure side , the other side is the ribbon, the non-cut surface of the first sliced cell will be squeezed by both sides, during the lamination process, the cut surface of the second sliced cell is relative to the non-cut surface of the first sliced cell The compressive stress experienced during the lamination process will be smaller. Therefore, the battery string overlapping method can reduce the possibility of deformation and cracks of the sliced cells during the lamination process, reduce the crack rate of the sliced cells, and can solve the problem that the existing overlapping cells are prone to occur during the lamination process. Hidden problem.

Description of drawings

Other characteristics, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a schematic diagram of a method for overlapping sliced cells according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a method for overlapping sliced cells according to an embodiment of the present invention.

Detailed ways

The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

Please refer to Figures 1 and 2, the method for overlapping sliced cells of the present invention includes the following steps:

Stack the ribbon 13 and the second battery slice 14 sequentially on the first battery slice 11, so that the orthographic projections of the first battery slice 11 and the second battery slice 14 on the plane where the ribbon 13 is located overlap. area, wherein the welding ribbon 13 is located between the first sliced battery piece 11 and the second sliced battery piece 14, and the non-cut surface 12 of the first sliced battery piece 11 and the cut surface 15 of the second sliced battery piece 14 are located in overlapping area, the negative pole of the first sliced battery sheet 11 and the negative pole of the second sliced battery slice are both facing upward;

Welding the first sliced battery sheet 11 and the second sliced battery sheet 14 to the welding ribbon 13 respectively to obtain the battery sheet layer 10;

Laminate the glass layer 20 and the first adhesive film layer 30 in sequence, turn the battery sheet layer 10 over to the side of the first adhesive film layer 30 facing away from the glass layer 20 , and continue on the battery sheet layer 10 facing away from the first adhesive film layer 30 Laminate the second adhesive film layer 40 and the back sheet layer 50 on one side of the glass layer, and apply lamination pressure to the back sheet layer 50 for lamination, wherein the negative electrode 16 of the second sliced battery sheet 14 faces the glass layer.

In an embodiment of the invention, the ribbon is used to electrically connect the first battery slice and the second battery slice, so that the first battery slice and the second battery slice are connected in series and stacked sequentially on the first battery slice The ribbon and the second sliced battery, the orthographic projections of the first sliced battery and the second sliced battery on the plane where the ribbon is located have an overlapping area, so that the laminated first sliced battery and the second sliced battery The sheets will partially overlap, allowing the photovoltaic modules to be more tightly bonded.

The non-cutting surface of the first sliced battery sheet and the cut surface of the second sliced battery sheet are set in the overlapping area, and the battery sheet layer is turned over during the stacking process so that the non-cutting surface of the first sliced battery sheet is located at Between the cut surface of the second sliced cell and the backplane layer, when the layer pressure is applied to the backplane layer, that is, the layer pressure is applied to the non-cut surface of the first sliced cell, and the non-cut surface of the first sliced cell The cutting surface is not damaged by cutting and has high strength. During the lamination process, deformation and cracks are not easy to occur, thereby reducing the crack rate of sliced cells.

Further, the number of welding ribbons 20 is ≥2.

In an embodiment of the invention, the number of welding ribbons is ≥ 2, so that when the first sliced battery piece and the second sliced battery piece are pressed together, the number of contact parts between the first sliced battery piece and the second sliced battery piece and the welding ribbon is reduced The pressure reduces the possibility of deformation and cracking of the first sliced cell and the second sliced cell during the lamination process, and improves the yield rate of photovoltaic modules.

Further, the welding ribbons 20 are spaced between the first slice battery 10 and the second slice battery 30 .

In the embodiment of the invention, the welding ribbons are spaced between the first sliced battery and the second sliced battery, so that the first sliced battery and the second sliced battery are more evenly stressed during the lamination process , reducing the possibility of deformation and cracking of the first sliced cell and the second sliced cell during the lamination process, and improving the yield rate of the photovoltaic module.

Further, both the first sliced cell 10 and the second sliced cell 30 are half-cut cells.

In the embodiment of the invention, both the first sliced cell and the second sliced cell are half-cut cells, that is, both the first sliced cell and the second sliced cell are provided with a side cut surface, which can be, but not only Yes, before lamination, the non-cut surface of the first sliced battery sheet opposite to the cut surface of the first sliced battery sheet is placed in the overlapping area to further reduce the hidden crack rate of the sliced battery sheet.

Further, after lamination, one end of the welding ribbon 13 is electrically connected to the negative electrode of the first sliced battery piece 11 , and the other end of the welding ribbon 13 is electrically connected to the positive electrode of the second sliced battery piece 14 .

In the embodiment of the invention, the first battery slice and the second battery slice are electrically connected by soldering tape, the connection is stable, the electrical conductivity is good, the processing difficulty is low, and it is convenient for mass production and cost control.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but should also cover the technical solution formed by the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of or equivalent features thereof. For example, a technical solution formed by replacing the above-mentioned features with technical features with similar functions disclosed in (but not limited to) this application.

Claims (5)

1. A method for overlapping sliced cells, comprising the following steps: Stacking the ribbon and the second battery slice in sequence on the first battery slice, so that the orthographic projections of the first battery slice and the second battery slice on the plane where the ribbon is located have overlapping areas , wherein the ribbon is located between the first sliced cell and the second sliced cell, the non-cut surface of the first sliced cell and the cut surface of the second sliced cell Located in the overlapping area, the negative electrodes of the first sliced battery sheet and the negative electrodes of the second sliced battery sheet are both facing upward; Welding the first battery slice and the second battery slice to the ribbon respectively to obtain battery slices; Laminate the glass layer and the first adhesive film layer in sequence, turn the battery sheet layer over to the side of the first adhesive film layer facing away from the glass layer, and continue to place the battery sheet layer on the side facing away from the first One side of the adhesive film layer is stacked with a second adhesive film layer and a back sheet layer, and a lamination pressure is applied to the back sheet layer for lamination, wherein the negative electrode of the second sliced battery sheet faces the glass layer. 2 . The method for overlapping sliced cells according to claim 1 , wherein the number of the welding strips is ≥2. 3 . 3 . The method for overlapping sliced battery slices according to claim 2 , wherein the welding ribbons are spaced between the first sliced battery slices and the second sliced battery slices. 4 . 4. The method for overlapping sliced cells according to claim 1, wherein the first sliced cell and the second sliced cell are both half-cut cells. 5. The method for overlapping sliced cells according to claim 1, characterized in that, after the lamination, one end of the soldering strip is electrically connected to the negative electrode of the first sliced cell, and the soldering strip The other end of the battery is electrically connected to the positive electrode of the second slice battery.