WO2023077820A1 - Method for manufacturing cell sheet assembly, and shingled photovoltaic module - Google Patents

Abstract

Provided in the present invention are a method for manufacturing a cell sheet assembly, and a shingled photovoltaic module. The method for manufacturing a cell sheet assembly comprises the following steps: printing an auxiliary grid line on an original cell sheet, and sintering the auxiliary grid line; slicing the original cell sheet to obtain a plurality of cell sheets; placing the cell sheets on a printing screen; printing, at an upper edge or a lower edge of the top surface or bottom surface of each cell sheet, a silver paste line connected to the auxiliary gate line, wherein the plurality of cell sheets are sequentially stacked and arranged in a first direction, the first direction is perpendicular to the lengthwise direction of the silver paste line, and the silver paste line is sandwiched at a position where any two adjacent cell sheets are stacked; and sintering the silver paste lines. The present invention further provides a shingled photovoltaic module. The method for manufacturing a cell sheet assembly provided by the present invention has the advantages of improving the printing precision, providing a good cell sheet fixing effect, and saving on raw materials.

Description

Fabrication method of cell module and shingled photovoltaic module

This application claims the priority of the Chinese patent application with the application number 202111308105.X and the title of the invention "Method for Manufacturing Cell Modules and Shingled Photovoltaic Modules" submitted to the China Patent Office on November 05, 2021, the entire content of which has been passed References are incorporated in this application.

technical field

The invention relates to the technical field of photovoltaic power generation equipment, in particular to a method for manufacturing a cell assembly and a shingled photovoltaic assembly.

Background technique

Shingled photovoltaic modules need to use conductive glue to connect the cells in series. The cost of conductive glue is high, and there is a risk of glue overflowing to cause leakage, and the application accuracy of the conductive glue is extremely high, which is a technical difficulty in the production line of shingled photovoltaic modules. In addition, the battery grid lines in the related art are formed by screen printing. For large-size battery original sheets of 182 and 210mm, the accuracy of screen printing is more difficult to control, and it is difficult to ensure the distance between the extremely narrow busbar electrode and the edge of the original battery sheet. distance. In the process of slicing, the non-destructive cutting and scribing technology also has a high error, which leads to the inability of the busbar electrode in the original battery to narrow the distance from the edge of the sliced battery, and thus the overlapping width of the two connected batteries is relatively small. Large, which in turn causes the defect of power generation performance loss.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

Therefore, the embodiment of the present invention proposes a method for manufacturing a cell assembly, which has the advantages of improved printing accuracy and good fixing effect of the cell.

Embodiments of the present invention provide a shingled photovoltaic module, which has the advantages of high conversion efficiency and small loss of effective area of cells.

The manufacturing method of the battery sheet assembly according to the embodiment of the present invention includes the following steps: printing the auxiliary grid lines on the original battery sheet, sintering the auxiliary grid lines, and slicing the original battery sheet to obtain a plurality of battery sheets; Place it on the printing screen, print the silver paste line connected with the auxiliary grid line on the upper or lower edge of the top surface or bottom surface of each battery sheet, and a plurality of battery sheets are stacked and arranged in sequence along the first direction. One direction is perpendicular to the length direction of the silver paste lines, and the silver paste lines are sandwiched between any two adjacent battery sheets, and the silver paste lines are sintered.

The manufacturing method of the cell assembly according to the embodiment of the present invention has the advantages of high printing precision, good fixing effect of the cell, low amount of silver paste, and low manufacturing cost of the cell assembly.

In some embodiments, the silver paste lines are formed by low-temperature silver paste printing.

In some embodiments, the silver paste line is formed by high temperature silver paste printing.

In some embodiments, the auxiliary grid lines are printed on both the top surface and the bottom surface of the battery sheet.

In some embodiments, the secondary grid lines on the surface of the battery sheet printed with the silver paste lines are formed by printing with aluminum paste.

In some embodiments, busbar lines for connecting with the silver paste lines are printed on the surface of the battery sheet printed with the silver paste lines, and the busbar lines are formed by printing with aluminum paste.

In some embodiments, the auxiliary grid lines are printed on the top surface or the bottom surface of the battery sheet, and the silver paste lines are printed on the surface of the battery sheet on which the auxiliary grid lines are printed. The silver paste line includes a plurality of first line segments and second line segments with different widths, and the plurality of first line segments and the plurality of second line segments are connected alternately.

In some embodiments, a plurality of the auxiliary grid lines are provided on the top surface and/or the bottom surface of the battery sheet, and the plurality of auxiliary grid lines on the same surface are arranged in a grid.

In some embodiments, the plurality of battery sheets placed on the printing screen are arranged at equal intervals along the first direction.

The shingled photovoltaic module according to the embodiment of the present invention includes a battery sheet assembly, which is a battery sheet assembly formed by the manufacturing method of the battery sheet assembly, and a plurality of battery sheets in the battery sheet assembly are laminated and connected.

The shingled photovoltaic module according to the embodiment of the present invention includes a plurality of battery sheet assemblies, the battery sheet assemblies are formed by the manufacturing method of the battery sheet assembly, the plurality of battery sheet assemblies are arranged in a row, and the battery sheet assemblies The battery slices in the assembly are connected to the corresponding battery slices of the adjacent said battery slice assembly.

The technical advantages of the shingled photovoltaic module according to the embodiment of the present invention are the same as those of the above-mentioned manufacturing method of the solar cell module, and will not be repeated here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a top view of an original battery sheet of a battery sheet assembly according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the original battery sheet for slicing of the battery sheet assembly in the embodiment of the present invention;

Fig. 3 is a schematic diagram of the printing silver paste line of the cell assembly in the embodiment of the present invention;

Fig. 4 is a schematic diagram of stacked and arranged battery sheets of the battery sheet assembly in the embodiment of the present invention;

Fig. 5 is a side view of the sintered battery piece of the battery piece assembly in the embodiment of the present invention;

Fig. 6 is a partially enlarged schematic diagram of a battery piece after sintering of the battery piece assembly in an embodiment of the present invention;

Fig. 7 is a partially enlarged schematic view of the silver paste line of the cell assembly in the embodiment of the present invention.

Reference signs: 1. The original sheet of the battery; 2. The auxiliary grid line; 3. The silver paste line; 4. The battery sheet; 5. The main grid line.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

Embodiments of the present invention propose a method for manufacturing a cell assembly. As shown in FIGS. 1-6 , the method for manufacturing a cell assembly includes the following steps,

Sub-grid lines 2 are printed on the original battery sheet 1 and the sub-grid lines 2 are sintered. As shown in FIG. 1 , the auxiliary grid line 2 is used to collect the current generated by the photovoltaic cell to improve the conversion efficiency. There is a gap between the auxiliary grid line 2 and the edge of the original battery sheet 1 .

The original battery sheet 1 is sliced to obtain a plurality of battery sheets 4 . As shown in Figures 1 and 2, when performing slicing processing on the original battery sheet 1, multiple cutting lines are preset on the original battery sheet 1 to obtain multiple battery sheets 4, adjacent cutting lines are parallel to each other, and the slicing process The obtained battery sheets 4 have the same size. The battery sheet 4 formed by cutting the original battery sheet 1 is small in size, so the size of the screen used for screen printing of the battery sheet 4 is smaller than the size of the screen printing screen for the original battery sheet 1, which can reduce the size of the screen in the printing process. Plate shape variable, improve printing accuracy.

The battery slices 4 are placed on the printing screen, and the silver paste lines 3 connected with the secondary grid lines 2 are printed on the upper or lower edge of the top or bottom surface of each battery slice 4 . As shown in Figure 3, the silver paste line 3 connects the auxiliary grid line 2 of the cell 4, and the silver paste line 3 plays the role of the main grid electrode of the cell 4, and the auxiliary grid line 2 can better realize current collection and improve conversion efficiency.

A plurality of battery sheets 4 are sequentially stacked and arranged along the first direction, as shown in Figure 4, the first direction is perpendicular to the length direction of the silver paste line 3, and any two adjacent battery sheets 4 are laminated with silver paste Line 3, sintering the silver paste line 3. The silver paste line 3 replaces the conductive glue to fix the stacked parts of the adjacent battery pieces 4, avoiding the risk of glue overflow caused by applying the conductive glue, and avoiding electric leakage.

The manufacturing method of the battery sheet assembly according to the embodiment of the present invention has the advantages of high printing accuracy, good fixing effect of the battery sheet 4, low silver paste consumption, and low manufacturing cost of the battery sheet assembly.

In some embodiments, the silver paste lines 3 are formed by printing with low temperature silver paste.

Therefore, low-temperature silver paste molding in a low-temperature environment is suitable for printing silver paste lines 3 on the surface of a temperature-sensitive battery, such as printing silver paste lines 3 on the surface of a heterojunction battery, and the low-temperature silver paste can prevent the silver paste from burning through the battery sheet 4 The pn junction at the edge causes leakage.

In some embodiments, the silver paste lines 3 are formed by high-temperature silver paste printing.

Therefore, the use of high-temperature silver paste can save material costs, and the high-temperature silver paste is suitable for printing silver paste lines 3 for batteries that are not sensitive to temperature.

In some embodiments, as shown in FIG. 6 , auxiliary grid lines 2 are printed on both the top surface and the bottom surface of the cell sheet 4 .

Thus, when the battery sheets 4 are stacked and arranged along the first direction, the silver paste lines 3 on the top surface of the battery sheet 4 are in contact with the auxiliary grid lines 2 on the bottom surface of the adjacent battery sheet 4 and the auxiliary grid lines 2 are connected. The silver paste line 3 acts as a main grid electrode on the bottom surface of the adjacent cell 4 . The auxiliary grid lines 2 printed on the bottom surface of the battery sheet 4 can guide the current on the bottom surface of the battery sheet 4, which can better realize current collection and improve conversion efficiency.

In some embodiments, the auxiliary grid lines 2 on the surface of the battery sheet 4 printed with silver paste lines 3 are formed by printing with aluminum paste.

Specifically, the sub-grid 2 on one side of the cell 4 is printed with aluminum paste, and the other side is printed with silver paste for the sub-grid 2, or the sub-grids on both sides of the cell 4 are printed with aluminum paste, and the sub-grid 2 is printed with aluminum paste. Forming can reduce material costs.

In some embodiments, as shown in FIGS. 1-4 , busbars 5 for connecting with silver paste lines 3 are also printed on the surface of battery sheet 4 printed with silver paste lines 3 , and busbars 5 are made of aluminum Paste printing molding.

Thus, the busbar 5 conveniently overlaps the sub-grid 2 on the surface of the cell 4, the busbar 5 gathers the current of the sub-grid 2 on the surface of the cell 4, improves the yield rate of the cell 4, and reduces the poor contact of the lap. risks of. The busbar 5 is formed by printing with aluminum paste, which can reduce the cost of materials.

In some embodiments, as shown in Fig. 1-Fig. 4 and Fig. 7, sub-grid lines 2 are printed on the top or bottom surface of the battery sheet 4, and the silver paste lines 3 are printed on the side of the battery sheet 4 with sub-grid lines. 2, the silver paste line 3 includes a plurality of first line segments and second line segments with different widths, and the plurality of first line segments and the plurality of second line segments are alternately connected.

Thus, the silver paste lines 3 are printed on the surface of the battery sheet 4 with the sub-grid lines 2 , and the silver paste lines 3 realize the collection of the current of the sub-grid lines 2 and the interconnection between the battery sheets 4 . The small width of the silver paste line 3 can reduce the coverage area of the cell 4 , thereby improving the conversion efficiency of the cell 4 .

As shown in Figure 7, the silver paste line 3 includes a first line segment and a second line segment, the axial directions of the first line segment and the second line segment coincide, and there is a second line segment between the adjacent first line segments, and the second line segment Both ends of the line segment are respectively connected to the first line segment.

Thus, the variation of the width of the silver paste line 3 can further save the consumption of silver paste.

In some embodiments, as shown in FIGS. 1-4 , multiple sub-grid lines 2 are arranged on the top surface and/or bottom surface of the battery sheet 4, and the multiple sub-grid lines 2 on the same surface are arranged in a grid. .

As a result, the rectangular grid formed by combining the plurality of auxiliary grid lines 2 increases the distribution range of the auxiliary grid lines 2 on the surface of the battery sheet 4 , better realizes the current collection effect of the auxiliary grid lines 2 , and improves conversion efficiency.

The rectangular grid formed by a plurality of sub-grid lines 2 on the battery sheet 4 is combined to form a sub-grid line group, and a plurality of sub-grid line groups are arranged on the top surface and/or bottom surface of the original battery sheet 1, and adjacent sub-grid line groups There is a blank area at a specific position, so that while reducing the consumption of silver paste, the efficiency of the solar cell can be effectively guaranteed, and the manufacturing cost of the solar cell is reduced as a whole. The cutting line of the original battery sheet 1 is drawn on the blank area between adjacent auxiliary grid line groups.

In some embodiments, as shown in FIG. 3 , a plurality of battery sheets 4 placed on the printing screen are arranged at equal intervals along the first direction.

Thus, there is a gap between the battery sheets 4, which is convenient for printing the silver paste line 3 with the edge of the battery sheet 4 as a reference, avoiding the influence of the dimensional tolerance of the battery sheet 4 caused by the scribing position offset error on the printing effect, and reducing the printing error. Printing accuracy. When printing the silver paste line 3, it is convenient to control the silver paste line 3 to be closer to the edge of the battery sheet 4, thereby reducing the overlapping width between two adjacent battery sheets 4 and ensuring the power generation performance of the battery sheet assembly.

According to the shingled photovoltaic module according to the embodiment of the present invention, as shown in Figure 5 and Figure 6, the shingled photovoltaic module includes a battery sheet assembly, and the battery sheet assembly is a battery sheet assembly formed by the manufacturing method of the battery sheet assembly, and the battery sheet A plurality of battery slices 4 in the assembly are stacked and connected, and the battery slices 4 are connected to adjacent battery slices 4 through silver paste wires 3 .

Specifically, the original battery sheet 1 of the size required by a shingled assembly is cut into multiple battery sheets 4 by dicing, and the silver paste lines are uniformly printed on the multiple battery sheets 4, and the multiple battery sheets 4 are laminated and connected, and the silver paste is sintered. The shingled photovoltaic module is obtained after the line. The shingled photovoltaic module adopts a cell sheet 4 cut from a cell sheet 1 to improve manufacturing efficiency and reduce processing costs. The silver paste material of the line 5, the distance between the silver paste line 3 printed on the surface of the battery sheet 4 and the edge of the battery sheet 4 is small, which reduces the overlapping width between two adjacent battery sheets 4, and the silver paste line 3 connects the secondary The grid lines 2 improve the overlapping accuracy of the shingled photovoltaic modules and improve the power generation efficiency of the shingled photovoltaic modules.

An embodiment of the present invention proposes a shingled photovoltaic module, as shown in Figure 5 and Figure 6, the shingled photovoltaic module includes a plurality of battery sheet assemblies, and the battery sheet assemblies are battery sheet assemblies formed by the manufacturing method of the battery sheet assembly , a plurality of battery slice assemblies are arranged in a row, and the battery slices 4 in the battery slice assemblies are connected to the corresponding battery slices 4 of the adjacent battery slice assemblies.

As a result, the shingled photovoltaic module uses silver paste lines 3 instead of conductive glue, which reduces the silver paste material for the busbar 5 on the battery sheet 4, and the distance between the silver paste lines 3 printed on the surface of the battery sheet 4 and the edges of the battery sheet 4 is small , the overlapping width between two adjacent cells 4 is reduced, and the connection of the silver paste line 3 to the secondary grid line 2 improves the overlapping precision of the shingled photovoltaic module and improves the power generation efficiency of the shingled photovoltaic module.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (11)

1. A method for manufacturing a cell assembly, comprising the following steps:

   Print the auxiliary grid lines on the original battery sheet, and sinter the auxiliary grid lines;

   Slicing the original battery sheet to obtain multiple battery sheets;

   Place the cells on the printed screen, and print silver paste lines connected to the auxiliary grid lines on the upper or lower edges of the top or bottom surface of each cell;

   A plurality of battery sheets are sequentially stacked and arranged along a first direction, the first direction is perpendicular to the length direction of the silver paste line, and the silver paste line is sandwiched between any two adjacent battery sheets;

   The silver paste wires are sintered.
2. The manufacturing method of the cell assembly according to claim 1, wherein the silver paste lines are formed by printing with low-temperature silver paste.
3. The manufacturing method of the cell assembly according to claim 1, wherein the silver paste lines are formed by printing with high-temperature silver paste.
4. The manufacturing method of the battery sheet assembly according to claim 1, wherein the auxiliary grid lines are printed on both the top surface and the bottom surface of the battery sheet.
5. The manufacturing method of the battery sheet assembly according to claim 4, wherein the auxiliary grid lines on the surface of the battery sheet on which the silver paste lines are printed are formed by printing with aluminum paste.
6. The manufacturing method of the battery sheet assembly according to claim 5, characterized in that, the surface of the battery sheet printed with the silver paste lines is also printed with bus bars for connecting with the silver paste lines, so The busbars are formed by printing with aluminum paste.
7. The manufacturing method of the battery sheet assembly according to claim 1, wherein the auxiliary grid lines are printed on the top surface or the bottom surface of the battery sheet, and the silver paste lines are printed on the printing surface of the battery sheet. On the surface with the secondary grid line, the silver paste line includes a plurality of first line segments and second line segments with different widths, and the plurality of first line segments and the plurality of second line segments are connected alternately.
8. The manufacturing method of battery sheet assembly according to claim 1, characterized in that, a plurality of said auxiliary grid lines are arranged on the top surface and/or bottom surface of said battery sheet, and a plurality of said auxiliary grid lines on the same surface The grid lines are arranged in a grid.
9. The method for manufacturing a battery sheet assembly according to claim 1, wherein the plurality of battery sheets placed on the printing screen are arranged at equal intervals along the first direction.
10. A shingled photovoltaic module, characterized in that it includes a cell assembly, the cell assembly is a cell assembly formed by the manufacturing method of the cell assembly according to any one of claims 1-9, the A plurality of battery slices in the battery slice assembly are laminated and connected.
11. A shingled photovoltaic module, characterized in that it includes a plurality of cell assemblies, the cell assembly is a cell assembly formed by the manufacturing method of a cell assembly according to any one of claims 1-9, A plurality of battery slice assemblies are arranged in a row, and the battery slices in the battery slice assemblies are connected to the corresponding battery slices of the adjacent battery slice assemblies.

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