Convergence method and device of back contact solar cell module

Abstract

The invention relates to the technical field of solar cell modules, and discloses a confluence method and device of a back contact solar cell module. The method comprises the following steps: connecting a plurality of back contact solar cells through welding strips to form a plurality of cell string units; an insulating layer and a bus bar are arranged on the back surface of the back contact solar cell at the outermost end of each cell string unit; and welding a welding strip on the bus bar to converge two adjacent cell string units so as to form a current path of the back contact solar cell module. According to the invention, the ultrathin bus bar is used as a connecting medium of two adjacent back contact solar cell string units and is arranged on the back surface of the back contact cell, so that the all-black appearance of the back contact solar cell module is realized, and the conversion efficiency of the module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell modules, and in particular to a method and device for collecting currents of a back-contact solar cell module. Background Art

[0002] During the construction of distributed photovoltaic power stations, due to the limited effective area of ​​the factory roof or roof, users mostly choose photovoltaic module products with beautiful appearance, good consistency, high power and high efficiency when selecting modules. Back-contact solar cell modules are widely favored by distributed users, especially courtyard and urban villa users, due to their advantages such as no grid lines on the front, uniform cell film color, all-black appearance, low linear power attenuation rate, and excellent weak light response.

[0003] In terms of structural design, the existing series-parallel back-contact solar cell modules are designed to have the bus bars outside the upper and lower ends of the cell strings and maintain a certain creepage distance from the edges of the cells. This design has the effect of not having a good appearance consistency (especially black backplane single-glass modules), leaving a large white space inside the module and a low utilization rate. In addition, because the middle bus bar must reserve a creepage distance from the upper and lower cell strings, the module is larger in length and has a low conversion efficiency. Summary of the invention

[0004] The object of the present invention is to provide a method and device for converging back-contact solar cell modules, which not only achieves a fully black module appearance, but also reduces the blank area inside the solar cell module and the size of the solar cell module, thereby improving the appearance consistency and conversion efficiency.

[0005] To achieve the above object, the present invention provides a method for converging back-contact solar cell modules, which comprises:

[0006] Connect multiple back-contact solar cells through welding ribbons to form multiple battery string units;

[0007] An insulating layer and a bus bar are provided on the back side of the back contact solar cell at the outermost end of each battery string unit;

[0008] A welding ribbon is welded on the bus bar to connect two adjacent battery string units, thereby forming a current path for the back contact solar cell module.

[0009] The present invention also provides a collector device for a back-contact solar cell assembly, comprising:

[0010] Forming a unit for connecting a plurality of back-contact solar cells through welding ribbons to form a plurality of battery string units;

[0011] A setting unit is used to set an insulating layer and a bus bar on the back side of the back contact solar cell at the outermost end of each battery string unit;

[0012] The busbar unit is used to weld a welding strip on the busbar to connect two adjacent battery string units, thereby forming a current path for the back contact solar cell module.

[0013] Technical effects and advantages of the present invention:

[0014] The present invention discloses a method for converging back-contact solar cell modules, comprising: connecting a plurality of back-contact solar cells by welding strips to form a plurality of cell string units; arranging an insulating layer and a bus bar on the back side of the back-contact solar cell at the outermost end of each cell string unit; welding the welding strips on the bus bar to converge two adjacent cell string units, thereby forming a current path for the back-contact solar cell module.

[0015] The present invention adopts an ultra-thin bus bar as a connecting medium for two adjacent back-contact solar cell string units and arranges it on the back side of the back-contact cell, thereby achieving a completely black appearance of the back-contact solar cell module and improving the module conversion efficiency.

[0016] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flow chart of a method for collecting currents of a back-contact solar cell module;

[0018] Figure 2 It is a schematic diagram of the confluence of adjacent back-contact solar cell strings;

[0019] Figure 3 Schematic diagram of printing an insulating layer on the back side of a back-contact solar cell;

[0020] Figure 4 Arrange ultra-thin segmented busbar pattern on the insulating layer;

[0021] Figure 5 A partial schematic diagram of an ultra-thin busbar. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0024] In order to better understand the present scheme, the following is a brief introduction to the busbar method of the back-contact solar cell module: the back-contact solar cell module comprises a plurality of back-contact cell string units, and every two adjacent cell string units constitute a back-contact cell string group; each back-contact cell string unit comprises a plurality of back-contact solar cells connected in series, which back-contact solar cells can be full-cut right-angle cells or half-cut right-angle cells, and the adjacent back-contact solar cells are interconnected by overlapping and lapped connection with ultra-thin welding strips; the back of the outermost back-contact solar cells at both ends of each back-contact cell string unit are intermittently printed with an insulating layer, and an ultra-thin segmented bus bar is arranged on the insulating layer; the ultra-thin segmented bus bar busbar not only realizes the busbar convergence of two adjacent back-contact cell string units, but the black area of ​​the ultra-thin segmented bus bar can also cover the gap between adjacent back-contact cell string units to achieve a completely black appearance, thereby solving the problem in the background.

[0025] The present invention discloses a method for collecting current of a back-contact solar cell assembly. Figure 1 As shown, the method includes:

[0026] 1. Connect multiple back-contact solar cells through welding ribbons to form multiple battery string units.

[0027] Specifically, the plurality of back-contact solar cells are divided into a plurality of groups; adjacent back-contact solar cells in each group are connected by overlapping each other, and adjacent back-contact solar cells are connected by ultra-thin welding strips, such as Figure 2 shown.

[0028] Wherein, adjacent back contact solar cells are connected by overlapping each other, and the overlapping distance is between 0.2 and 0.8 mm.

[0029] 2. An insulating layer and a bus bar are provided on the back side of the back-contact solar cell at the outermost end of each battery string unit.

[0030] Specifically, an insulating layer is intermittently printed on the back of the back-contact solar cells at the outermost ends of each battery string unit, and a segmented bus bar is arranged on the insulating layer, or an insulating layer is intermittently printed on the back of the back-contact solar cells at the outermost ends of the first or last end of each battery string unit, and a bus bar is arranged on the insulating layer.

[0031] Among them, the width of the insulating layer is W, and the length of the insulating layer is b. Since the positive and negative electrodes on the back of the back contact battery are arranged alternately, the length of the insulating layer b must be greater than the hollow length a. Figure 3 and 4 shown.

[0032] Among them, the thickness of the ultra-thin busbar is between 0.10 and 0.25 mm, the length c of the black area is consistent with the spacing between two adjacent battery string units, the width d of the black area is consistent with the width of the busbar, and the length e of the non-black area (i.e., the length connected to the battery) is less than or equal to the side length of the back contact battery, such as Figure 5 shown.

[0033] The width d of the ultra-thin segmented busbar must be smaller than the width W of the printed insulation layer.

[0034] 3. Welding a welding strip on the bus bar is used to connect two adjacent battery string units, thereby forming a current path for the back contact solar cell module.

[0035] The present invention discontinuously prints an insulating layer on the outermost ends of the back sides of the cells at both ends of the back-contact solar cell string, and arranges an ultra-thin segmented bus bar on the insulating layer. Through an innovative busbar method, the current path of the back-contact solar cell string group is realized, which reduces the blank space inside the component, shortens the long side size, reduces the component version, improves the conversion efficiency, and enhances the matching degree and power generation efficiency of the back-contact solar cell component and the building.

[0036] The present invention also provides a collector device for a back-contact solar cell assembly, comprising:

[0037] Forming a unit for connecting a plurality of back-contact solar cells through welding ribbons to form a plurality of battery string units;

[0038] A setting unit is used to set an insulating layer and a bus bar on the back side of the back contact solar cell at the outermost end of each battery string unit;

[0039] The busbar unit is used to weld a welding strip on the busbar to connect two adjacent battery string units, thereby forming a current path for the back contact solar cell module.

[0040] The plurality of back-contact solar cells are connected by welding strips to form a plurality of battery string units. Specifically, the plurality of back-contact solar cells are divided into a plurality of groups; adjacent back-contact solar cells in each group are connected by overlapping each other, and adjacent back-contact solar cells are connected by ultra-thin welding strips, such as Figure 2 shown.

[0041] Wherein, adjacent back contact solar cells are connected by overlapping each other, and the overlapping distance is between 0.2 and 0.8 mm.

[0042] Wherein, an insulating layer and a bus bar are arranged on the back of the back-contact solar cell at the outermost end of each battery string unit. Specifically, it includes: intermittently printing an insulating layer on the back of the back-contact solar cell at the outermost end of each battery string unit, and arranging a segmented bus bar on the insulating layer, or intermittently printing an insulating layer on the back of the back-contact solar cell at the outermost end of the first or last end of each battery string unit, and arranging a bus bar on the insulating layer.

[0043] Among them, the width of the insulating layer is W, and the length of the insulating layer is b. Since the positive and negative electrodes on the back of the back contact battery are arranged alternately, the length of the insulating layer b must be greater than the hollow length a. Figure 3 and 4 shown.

[0044] Among them, the thickness of the ultra-thin busbar is between 0.10 and 0.25 mm, the length c of the black area is consistent with the spacing between two adjacent battery string units, the width d of the black area is consistent with the width of the busbar, and the length e of the non-black area (i.e., the length connected to the battery) is less than or equal to the side length of the back contact battery, such as Figure 5 shown.

[0045] The width d of the ultra-thin segmented busbar must be smaller than the width W of the printed insulation layer.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for collecting current of a back-contact solar cell module, characterized in that: include: Connect multiple back-contact solar cells through welding ribbons to form multiple battery string units; An insulating layer and a bus bar are provided on the back side of the back contact solar cell at the outermost end of each battery string unit; A welding ribbon is welded on the bus bar to connect two adjacent battery string units, thereby forming a current path for the back contact solar cell module.

2. The method according to claim 1, characterized in that Multiple back-contact solar cells are connected by welding ribbons to form multiple battery string units, including: Dividing a plurality of back-contact solar cells into a plurality of groups; Adjacent back-contact solar cells in each group are connected in series by overlapping and lap joints, and are connected by welding ribbons to form a cell string unit.

3. The method according to claim 2, characterized in that The overlapping distance between the adjacent back-contact solar cells is 0.2 to 0.8 mm.

4. The method according to claim 1, characterized in that The back contact solar cell is a full-cell right-angle solar cell or a half-cell right-angle solar cell.

5. The method according to claim 1, characterized in that The method of providing an insulating layer and a bus bar on the back side of the back contact solar cell at the outermost end of each battery string unit comprises: An insulating layer is intermittently printed on the back of at least one outermost back-contact solar cell at the head or tail of each battery string unit, and a bus bar is arranged on the insulating layer, and the bus bar is black at the gap between two battery strings.

6. The method according to claim 5, characterized in that The length b of the insulating layer is greater than the hollow length a formed by the alternating arrangement of the positive and negative electrode fingers on the back of the back contact solar cell.

7. The method according to claim 1, characterized in that The bus bar has a thickness of 0.10 to 0.25 mm.

8. The method according to claim 6, characterized in that The bus bar includes a black area and a non-black area; Among them, the length c of the black area is the same as the distance between two adjacent battery string units, the width d of the black area is the same as the width of the bus bar, and the length e of the non-black area is ≤ the side length of the back contact solar cell.

9. The method according to claim 8, characterized in that The width d of the bus bar is smaller than the width W of the insulating layer.

10. The method according to claim 1, characterized in that The back contact solar cell module is a black backboard single glass module.

11. A collector device for a back-contact solar cell module, characterized in that: include: Forming a unit for connecting a plurality of back-contact solar cells through welding ribbons to form a plurality of battery string units; A setting unit is used to set an insulating layer and a bus bar on the back side of the back contact solar cell at the outermost end of each battery string unit; The busbar unit is used to weld a welding strip on the busbar to connect two adjacent battery string units, thereby forming a current path for the back contact solar cell module.

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