Method for manufacturing cell module and shingled photovoltaic module

Abstract

The present invention provides a method for manufacturing a cell assembly and a shingled photovoltaic assembly. The method for manufacturing a cell assembly includes the following steps: printing a secondary grid line on a cell original sheet, sintering the secondary grid line, slicing the cell original sheet to obtain a plurality of cells, placing the cell on a printing screen, printing a silver paste line connected to the secondary grid line on the upper edge or lower edge of the top surface or bottom surface of each cell, and stacking and arranging the plurality of cells in sequence along a first direction, the first direction being perpendicular to the length direction of the silver paste line, and sandwiching the silver paste line between any two adjacent cells at the stacking position, and sintering the silver paste line. The present invention also provides a shingled photovoltaic assembly. The method for manufacturing a cell assembly provided by the present invention has the advantages of improving printing accuracy, good cell fixing effect, and saving raw materials.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation equipment, and in particular to a method for manufacturing a cell sheet assembly and a shingled photovoltaic assembly. Background Art

[0002] Shingled photovoltaic modules require the use of conductive glue to connect the cells in series. The cost of conductive glue is high, and there is a risk of glue overflow, resulting in leakage. The conductive glue application accuracy is extremely high, which is a technical difficulty in the production line of shingled photovoltaic modules. In addition, the grid lines of the cell cells in the related technology are formed by screen printing. For large-sized cell sheets of 182 and 210 mm, the accuracy of screen printing is more difficult to control, and it is difficult to ensure the distance between the extremely narrow main grid electrode and the edge of the cell sheet. During the slicing process, the non-destructive cutting and slicing technology also has a high error, resulting in the main grid electrode in the cell sheet being unable to narrow the distance from the edge of the cell sheet after slicing, and then there is a large overlap width between the two connected cells, which in turn causes a loss of power generation performance. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a method for manufacturing a battery cell assembly. The method for manufacturing a battery cell assembly has the advantages of improving printing accuracy and having a good battery cell fixing effect.

[0005] The embodiment of the present invention provides a shingled photovoltaic module, which has the advantages of high conversion efficiency and small loss of effective area of ​​the solar cell.

[0006] The manufacturing method of the battery cell assembly according to the embodiment of the present invention comprises the following steps: printing the auxiliary grid line on the battery original sheet and sintering the auxiliary grid line, slicing the battery original sheet to obtain a plurality of battery cells, placing the battery cells on a printing screen, printing a silver paste line connected to the auxiliary grid line on the upper edge or lower edge of the top surface or bottom surface of each battery cell, stacking the plurality of battery cells in sequence along a first direction, wherein the first direction is perpendicular to the length direction of the silver paste line, sandwiching the silver paste line between any two adjacent battery cells at the overlapped position, and sintering the silver paste line.

[0007] The method for manufacturing a cell assembly according to the embodiment of the present invention has the advantages of high printing accuracy, good cell fixing effect, low silver paste usage, and low cell assembly manufacturing cost.

[0008] In some embodiments, the silver paste line is formed by printing low-temperature silver paste.

[0009] In some embodiments, the silver paste line is formed by high-temperature silver paste printing.

[0010] In some embodiments, the secondary grid lines are printed on both the top surface and the bottom surface of the solar cell.

[0011] In some embodiments, the secondary grid lines on the surface of the battery cell on which the silver paste lines are printed are formed by printing with aluminum paste.

[0012] In some embodiments, a main grid line for connecting with the silver paste line is also printed on the surface of the battery cell on which the silver paste line is printed, and the main grid line is formed by printing with aluminum paste.

[0013] In some embodiments, the secondary grid line is printed on the top surface or the bottom surface of the battery cell, and the silver paste line is printed on the surface of the battery cell printed with the secondary grid line. The silver paste line includes multiple first line segments and second line segments with different widths, and multiple first line segments and multiple second line segments are alternately connected.

[0014] In some embodiments, a plurality of the secondary grid lines are disposed on the top surface and / or the bottom surface of the solar cell, and the plurality of the secondary grid lines on the same surface are arranged in a grid.

[0015] In some embodiments, the plurality of battery cells placed on the printing screen are arranged at equal intervals along the first direction.

[0016] The shingled photovoltaic module according to the embodiment of the present invention comprises a cell module, wherein the cell module is a cell module manufactured by a cell module manufacturing method, and a plurality of cells are stacked and connected in the cell module.

[0017] The shingled photovoltaic module according to the embodiment of the present invention comprises a plurality of cell assemblies, wherein the cell assemblies are formed by a cell assembly manufacturing method, the plurality of cell assemblies are arranged in a row, and the cells in the cell assemblies are connected to corresponding cells in adjacent cell assemblies.

[0018] The technical advantages of the shingled photovoltaic module according to the embodiment of the present invention are the same as the technical advantages of the manufacturing method of the above-mentioned solar cell module, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 4 is a top view of a battery cell of a battery cell assembly according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the slicing process of the battery cell assembly in an embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the silver paste printing line of the battery cell of the battery cell assembly in the embodiment of the present invention.

[0022] Figure 4It is a schematic diagram of stacked arrangement of battery cells in a battery cell assembly in an embodiment of the present invention.

[0023] Figure 5 It is a side view of a sintered battery cell of a battery cell assembly in an embodiment of the present invention.

[0024] Figure 6 It is a partial enlarged schematic diagram of a battery cell after sintering of a battery cell assembly in an embodiment of the present invention.

[0025] Figure 7 It is a partial enlarged schematic diagram of the silver paste line of the battery cell assembly in the embodiment of the present invention.

[0026] Figure numerals: 1, battery original cell; 2, auxiliary grid line; 3, silver paste line; 4, battery cell; 5, main grid line. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] The embodiment of the present invention provides a method for manufacturing a battery cell assembly, such as Figure 1-Figure 6 As shown, the method for manufacturing a battery cell assembly includes the following steps:

[0029] The auxiliary grid lines 2 are printed on the battery original sheet 1, and the auxiliary grid lines 2 are sintered. Figure 1 As shown, 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 cell original piece 1.

[0030] The battery original sheet 1 is sliced ​​to obtain a plurality of battery sheets 4. Figure 1 and Figure 2 As shown, when the battery original sheet 1 is sliced, a plurality of cutting lines are preset on the battery original sheet 1 to obtain a plurality of battery sheets 4, and the adjacent cutting lines are parallel to each other, and the battery sheets 4 obtained by the slicing process have the same size. The battery sheet 4 formed by cutting the battery original sheet 1 is small in size, so the size of the screen used for screen printing the battery sheet 4 is smaller than the size of the screen used for screen printing the battery original sheet 1, which can reduce the screen deformation amount during the printing process and improve the printing accuracy.

[0031] The cell 4 is placed on the printing screen, and the silver paste line 3 connected to the secondary grid line 2 is printed on the upper edge or lower edge of the top surface or bottom surface of each cell 4. Figure 3 As shown, the silver paste line 3 connects the secondary grid line 2 of the battery cell 4, and the silver paste line 3 plays the role of the main grid electrode of the battery cell 4. The secondary grid line 2 can better realize current collection and improve conversion efficiency.

[0032] A plurality of battery cells 4 are stacked and arranged in sequence along a first direction. Figure 4 As shown, the first direction is perpendicular to the length direction of the silver paste line 3, and a silver paste line 3 is sandwiched between any two adjacent battery cells 4 at the overlapped part, and the silver paste line 3 is sintered. The silver paste line 3 replaces the conductive glue to fix the overlapped part of the adjacent battery cells 4, avoiding the risk of glue overflow caused by applying the conductive glue and avoiding leakage.

[0033] The method for manufacturing a cell assembly according to the embodiment of the present invention has the advantages of high printing accuracy, good cell 4 fixing effect, low silver paste usage, and low cell assembly manufacturing cost.

[0034] In some embodiments, the silver paste line 3 is formed by printing low-temperature silver paste.

[0035] Therefore, low-temperature silver paste formed in a low-temperature environment is suitable for printing silver paste lines 3 on the surface of temperature-sensitive batteries, such as printing silver paste lines 3 on the surface of heterojunction batteries. Low-temperature silver paste can prevent the silver paste from burning through the pn junction at the edge of the battery cell 4 and causing leakage.

[0036] In some embodiments, the silver paste line 3 is formed by printing high-temperature silver paste.

[0037] Therefore, the use of high-temperature silver paste can save material costs, and the high-temperature silver paste is suitable for battery printing silver paste lines 3 that are not sensitive to temperature.

[0038] In some embodiments, Figure 6 As shown, auxiliary grid lines 2 are printed on both the top and bottom surfaces of the cell 4 .

[0039] Thus, when the cells 4 are stacked and arranged along the first direction, the silver paste lines 3 on the top surface of the cells 4 contact and connect the secondary grid lines 2 on the bottom surface of the adjacent cells 4, and the silver paste lines 3 serve as the main grid electrodes on the bottom surfaces of the adjacent cells 4. The secondary grid lines 2 printed on the bottom surface of the cells 4 can guide the current on the bottom surface of the cells 4, which can better realize current collection and improve conversion efficiency.

[0040] In some embodiments, the secondary grid lines 2 on the surface of the cell 4 printed with the silver paste lines 3 are formed by printing with aluminum paste.

[0041] Specifically, the secondary grid lines 2 on one side of the cell 4 are printed with aluminum paste, and on the other side are printed with silver paste, or the secondary grid lines on both sides of the cell 4 are printed with aluminum paste. The secondary grid lines 2 are printed with aluminum paste to reduce material costs.

[0042] In some embodiments, Figure 1-Figure 4 As shown, the surface of the cell 4 printed with the silver paste line 3 is also printed with a main grid line 5 for connecting with the silver paste line 3, and the main grid line 5 is formed by printing with aluminum paste.

[0043] Thus, the main grid line 5 is convenient for overlapping the auxiliary grid line 2 on the surface of the battery cell 4, and the main grid line 5 gathers the current of the auxiliary grid line 2 on the surface of the battery cell 4, improves the quality rate of the battery cell 4, and reduces the risk of poor overlapping contact. The main grid line 5 is formed by aluminum paste printing to reduce material costs.

[0044] In some embodiments, Figure 1-Figure 4 and Figure 7 As shown, a secondary grid line 2 is printed on the top surface or the bottom surface of the battery cell 4, and a silver paste line 3 is printed on the surface of the battery cell 4 where the secondary grid line 2 is printed. The silver paste line 3 includes multiple first line segments and second line segments with different widths, and multiple first line segments and multiple second line segments are alternately connected.

[0045] Thus, the silver paste line 3 is printed on the surface of the cell 4 with the secondary grid line 2, and the silver paste line 3 realizes the collection of the current of the secondary grid line 2 and the interconnection between the cells 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.

[0046] like Figure 7 As shown, 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 with each other, the second line segment is spaced between adjacent first line segments, and both ends of the second line segment are respectively connected to the first line segment.

[0047] Therefore, the change in the width of the silver paste line 3 can further save the amount of silver paste.

[0048] In some embodiments, Figure 1-Figure 4 As shown, a plurality of secondary grid lines 2 are arranged on the top surface and / or the bottom surface of the battery cell 4, and the plurality of secondary grid lines 2 on the same surface are arranged in a grid.

[0049] Therefore, the rectangular grid formed by splicing multiple secondary grid lines 2 increases the distribution range of the secondary grid lines 2 on the surface of the battery cell 4, better realizes the current collection effect of the secondary grid lines 2, and improves the conversion efficiency.

[0050] A rectangular grid formed by multiple secondary grid lines 2 on the cell 4 is assembled to form a secondary grid line group. Multiple secondary grid line groups are arranged on the top surface and / or bottom surface of the cell original piece 1. There are blank areas at specific positions between adjacent secondary grid line groups, thereby reducing the consumption of silver paste while effectively ensuring the efficiency of the solar cell, and reducing the preparation cost of the solar cell as a whole. The cutting line of the cell original piece 1 is drawn on the blank area between adjacent secondary grid line groups.

[0051] In some embodiments, Figure 3 As shown, a plurality of battery cells 4 placed on the printed screen are arranged at equal intervals along a first direction.

[0052] As a result, there are gaps between the cells 4, making it convenient to print the silver paste lines 3 with the edge of the cell 4 as a reference, avoiding the cell 4 size tolerance caused by the scribe position offset error affecting the printing effect, and reducing the printing error and improving the printing accuracy. When printing the silver paste lines 3, it is convenient to control the silver paste lines 3 to be closer to the edge of the cell 4, thereby reducing the overlap width between two adjacent cells 4 and ensuring the power generation performance of the cell assembly.

[0053] According to an embodiment of the present invention, a shingled photovoltaic module, such as Figure 5 and Figure 6 As shown, the shingled photovoltaic module includes a cell assembly, which is a cell assembly manufactured by a cell assembly manufacturing method, in which a plurality of cells 4 are stacked and connected, and the cells 4 are connected to adjacent cells 4 by silver paste lines 3.

[0054] Specifically, a battery original sheet 1 of the size required for a shingled module is cut into multiple battery cells 4 by slicing, and silver paste lines are uniformly printed on the multiple battery cells 4. The multiple battery cells 4 are stacked and connected, and the silver paste lines are sintered to obtain a shingled photovoltaic module. The shingled photovoltaic module uses battery cells 4 cut from a piece of battery original sheet 1 to improve manufacturing efficiency and reduce processing costs. The silver paste lines 3 replace conductive glue, which reduces the silver paste used for the main grid lines 5 on the battery cells 4. The silver paste lines 3 printed on the surface of the battery cells 4 are close to the edges of the battery cells 4, which reduces the overlapping width between two adjacent battery cells 4. The silver paste lines 3 are connected to the secondary grid lines 2 to improve the overlapping accuracy of the shingled photovoltaic module and improve the power generation efficiency of the shingled photovoltaic module.

[0055] An embodiment of the present invention provides a shingled photovoltaic module, such as Figure 5 and Figure 6 As shown, the shingled photovoltaic module includes a plurality of cell assemblies, which are cell assemblies manufactured by a cell assembly manufacturing method, and the plurality of cell assemblies are arranged in a row, and the cells 4 in the cell assemblies are connected to the corresponding cells 4 of the adjacent cell assemblies.

[0056] Therefore, the shingled photovoltaic module adopts silver paste lines 3 instead of conductive glue, which reduces the silver paste material of the main grid lines 5 on the battery cells 4. The silver paste lines 3 printed on the surface of the battery cells 4 are close to the edges of the battery cells 4, which reduces the overlapping width between two adjacent battery cells 4. The silver paste lines 3 connecting the secondary grid lines 2 improve the overlapping accuracy of the shingled photovoltaic module and improve the power generation efficiency of the shingled photovoltaic module.

[0057] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for manufacturing a battery cell assembly, characterized in that: The following steps are involved: Printing the auxiliary grid lines on the battery original sheet and sintering the auxiliary grid lines; Slicing the battery original sheet to obtain multiple battery sheets; Placing the battery cell on a printing screen, and printing a silver paste line connected to the secondary grid line on the upper edge or lower edge of the top surface or bottom surface of each battery cell; A plurality of battery cells are stacked and arranged in sequence 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 cells at the stacking position; the plurality of battery cells placed on the printing screen are arranged at equal intervals along the first direction; Sintering the silver paste line; The secondary grid lines are printed on the top surface and the bottom surface of the battery cell; The secondary grid lines on the surface of the cell printed with the silver paste lines are formed by printing with aluminum paste; The surface of the cell on which the silver paste line is printed is also printed with a main grid line for connecting with the silver paste line, and the main grid line is formed by printing with aluminum paste; The silver paste line is formed by printing low-temperature silver paste.

2. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: The secondary grid lines are printed on the top surface or the bottom surface of the battery cell, and the silver paste lines are printed on the surface of the battery cell where the secondary grid lines are printed. The silver paste lines include multiple first line segments and second line segments with different widths, and the multiple first line segments and the multiple second line segments are alternately connected.

3. The method for manufacturing a battery cell assembly according to claim 1, characterized in that: A plurality of the secondary grid lines are arranged on the top surface and / or the bottom surface of the battery cell, and the plurality of the secondary grid lines on the same surface are arranged in a grid.

4. A shingled photovoltaic module, characterized in that: It comprises a battery cell assembly, wherein the battery cell assembly is a battery cell assembly manufactured by the manufacturing method of the battery cell assembly according to any one of claims 1 to 3, and a plurality of battery cells in the battery cell assembly are stacked and connected.

5. A shingled photovoltaic module, characterized in that: It comprises a plurality of battery cell assemblies, wherein the battery cell assemblies are formed by the method for manufacturing a battery cell assembly according to any one of claims 1 to 3, the plurality of battery cell assemblies are arranged in a row, and the battery cells in the battery cell assemblies are connected to the corresponding battery cells of the adjacent battery cell assemblies.

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