Patent Application
20240136457
This application claims the benefit of, and priority under 35 U.S.C. § 119 to, Chinese Utility Model Patent Application No. 202222789696.3, filed Oct. 21, 2022, the disclosure of which is hereby incorporated herein by reference in its entirety and for all purposes.
The present disclosure relates to the photovoltaic field and more particularly, but not exclusively, to an anti-shading photovoltaic cell assembly.
With the continuous upgrading of photovoltaic cell and assembly technologies, a bifacial technology and a super multi-busbar technology have emerged, and various auxiliary materials have also been upgraded. For example, photovoltaic solder ribbons have developed from the original rectangular shape to the current round shape and are developing toward a smaller size. Currently, solder ribbon connection is still the mainstream photovoltaic assembly manufacturing process. To maximize a light-receiving area on the front surface of the assembly, a metal wrap through (MWT) back-contact cell has been developed. However, such MWT cells require high costs and still cannot maximize the light-receiving area on the front and back surfaces at the same time, resulting in low output power and a low power generation capacity.
An aspect of the disclosure relates to an improved anti-shading photovoltaic cell assembly and methods for making and using the same. By use of side soldering, a light-receiving area of the photovoltaic cell assembly is increased, thereby increasing the output power and the power generation capacity.
An anti-shading photovoltaic cell assembly is provided, including a cell layer comprising N cell strings connected in series, each of the cell strings comprises M cell modules connected in series, each of the cell modules comprises P solar cells connected in parallel, each of the solar cells has a light-receiving surface, a rear surface, and a plurality of sides located between the light-receiving surface and the rear surface, the plurality of sides comprising a first side and a second side being opposite to the first side, and the first sides of the P solar cells in each of the cell modules are connected through a first solder ribbon, and the second sides of the P solar cells in each of the cell modules are connected through a second solder ribbon.
In some embodiments, the anti-shading photovoltaic cell assembly, further comprising a front panel and a back panel, the cell layer is encapsulated between the front panel and the back panel.
In some embodiments, N comprises a positive integer that is greater than or equal to one.
In some embodiments, M comprises a positive integer that is greater than or equal to two, and wherein P comprises a positive integer that is greater than or equal to two.
In some embodiments, every two adjacent cell modules in each of the cell strings are connected in series through the first solder ribbon or the second solder ribbon.
In some embodiments, the first sides of a first one of the adjacent cell modules are connected to the first sides of a second one of the adjacent cell modules through the first solder ribbon.
In some embodiments, the N cell strings are connected in series through a busbar, and the busbar is connected between the first solder ribbons of every two adjacent cell strings.
In some embodiments, the second sides of a first one of the adjacent cell modules are connected to the second sides of a second one of the adjacent cell modules through the second solder ribbon.
In some embodiments, the N cell strings are connected in series through a busbar, and the busbar is connected between the second solder ribbons of every two adjacent cell strings.
In some embodiments, the first solder ribbon is soldered to the first sides of the P solar cells in each of the cell modules, and wherein the second solder ribbon is soldered to the second sides of the P solar cells in each of the cell modules.
In some embodiments, each of the solar cells comprises a front electrode located on the light-receiving surface and a rear electrode located on the rear surface, one of the front electrode and the rear electrode being conductively connected to the first solder ribbon, and the other one of the front electrode and the rear electrode being conductively connected to the second solder ribbon.
In some embodiments, an upper portion of the first solder ribbon or an upper portion of the second solder ribbon does not extend beyond the light-receiving surfaces of the solar cells, and wherein a bottom portion of the first solder ribbon or a bottom portion of the second solder ribbon does not extend beyond the rear surfaces of the solar cells.
In some embodiments, the first sides of the P solar cells in each of the cell modules are parallel with the second sides of the P solar cells in each of the cell modules.
In some embodiments, the M cell modules of each of the cell strings are arranged sequentially along the first sides of the P solar cells.
In some embodiments, the P solar cells of each of the cell modules are arranged sequentially along the first sides.
In some embodiments, the N cell strings are arranged on one side of the first sides of the P solar cells along a direction perpendicular to the first sides.
In some embodiments, a spacing between any two adjacent solar cells is less than or equal to one half millimeter.
In some embodiments, a spacing between any two adjacent cell modules is less than or equal to one half millimeter.
A method for assembling anti-shading photovoltaic cells is provided, including: connecting N cell strings in series to form a cell layer, each of the cell strings comprises M cell modules connected in series, each of the cell modules comprises P solar cells connected in parallel, each of the solar cells has a light-receiving surface, a rear surface, and a plurality of sides located between the light-receiving surface and the rear surface, the plurality of sides comprising a first side and a second side being opposite to the first side, and the first sides of the P solar cells in each of the cell modules are connected through a first solder ribbon, and the second sides of the P solar cells in each of the cell modules are connected through a second solder ribbon.
In some embodiments, further comprising encapsulating the cell layer between a front panel and a back panel.
The foregoing solutions of the disclosure have the following advantages.
In the disclosure, because the sides of the solar cells are connected through the solder ribbons, front and rear surfaces of the solar cells are not blocked by the solder ribbon. In addition, because the cells are connected in parallel and then in series, the light-receiving areas on the front and back surfaces of the photovoltaic cell assembly are increased, thereby increasing the output power and the power generation capacity.
To describe the technical solutions of the disclosure more clearly, the following briefly describes the drawings required for describing the embodiments. Apparently, the drawings in the following description show merely some embodiments of the disclosure, and those of ordinary skill in the art may still derive other drawings from these drawings without creative efforts.
In the drawings: 1—cell layer; 2—cell string; 3—cell module; 4—solar cell; 41—light-receiving surface; 42—rear surface; 43—first side; 44—second side; 5—first solder ribbon; 6—second solder ribbon; 7—busbar; 8—negative electrode lead-out terminal; 9—positive electrode lead-out terminal; 10—bypass diode; 11—isolation strip; 12—panel; 13—back panel; and 14—encapsulation layer.
Example embodiments of the disclosure will be described in detail below in conjunction with the accompanying drawings so that advantages and features of the disclosure can be more easily understood by those skilled in the art. It should be noted herein that the description of these embodiments is used for helping understand the disclosure but is not intended to limit the disclosure. In addition, the technical features involved in the embodiments of the disclosure described below may be combined with each other as long as they do not conflict with each other.
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Preferably, the first solder ribbon 5 is soldered to the first side 43 of the solar cell 4, and the second solder ribbon 6 is soldered to the second side 44 of the solar cell 4. In some other embodiments, the solder ribbon may alternatively be connected to the solar cell by adhesive dispensing. An upper portion of the first solder ribbon 5 or the second solder ribbon 6 does not extend beyond the light-receiving surface of the solar cell 4 and a bottom portion of the first solder ribbon 5 or the second solder ribbon 6 does not extend beyond a rear surface of the solar cell 4.
In this embodiment, a voltage of the assembly may be changed to adapt to different usage scenarios. The anti-shading photovoltaic cell assembly can be applied to building integrated photovoltaics (BIPVs) and conventional crystalline silicon assemblies, such as a heterojunction cell, a monocrystalline silicon TOPCon cell, a passivated emitter rear contact (PERC) solar cell. In addition, the photovoltaic cell assembly in this embodiment is compatible with cells of various sizes and types, such as 158 cells, 166 cells, 182 cells, and 210 cells.
To sum up, the disclosure has following advantages:
The use of side soldering and better layout can increase the light-receiving areas on the front and back surfaces of the assembly, thereby increasing the output power and the power generation capacity. The solder ribbons and the solar cell are connected in the same plane, there is no solder ribbon inserted between the cells, and the solder ribbon is separated from a force receiving surface of the cell, thereby effectively reducing the risks caused by cell cracking. Because the cell layer is encapsulated between the panel and the back panel, there is no solder ribbon on the front and back surfaces, so that the thickness of an ethylene-vinyl acetate copolymer (EVA) film or polyolefin (POE) film can be reduced, thereby reducing costs of the assembly.
As used in the specification and claims, the terms “comprise”, “include” and variants thereof merely imply the inclusion of clearly identified steps and elements, such steps and elements are not to be construed as an exclusive enumeration, and the method or device may also include other steps or elements. The term “and/or” used in the specification includes any one or any combination of one or more related listed items.
It should be noted that, unless otherwise particularly specified, that a feature is “fixed” or “connected” to another feature may mean that the feature is directly fixed or connected to the another feature, or indirectly fixed or connected to the another feature. In addition, the terms such as up, down, left, and right used in the disclosure are merely based on the relationship between relative positions of various components of the disclosure in the drawings.
As a preface to the detailed description, it should be noted that, as used in this specification and the appended claims, the singular forms “a”, “an” and “the” include plural referents, unless the context clearly dictates otherwise.
The foregoing embodiment is merely for illustrating the technical concept and features of the disclosure, is an example embodiment for enabling those skilled in the art to understand and implement the content of the disclosure, and is not intended to limit the protection scope of the disclosure. Any equivalent variation or modification made based on the principles of the disclosure shall fall within the protection scope of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202222789696.3 | Oct 2022 | CN | national |
