A structure and arrangement method of a photovoltaic bifacial module

Abstract

The present invention relates to the field of solar photovoltaic power generation technology, and specifically discloses a structure and arrangement method of a photovoltaic bifacial module, including: an upper glass layer, a bifacial cell array and a lower glass layer; the upper glass layer, the bifacial cell array and the lower glass layer are arranged in sequence from top to bottom; a plurality of trapezoidal grooves are provided on the lower glass layer; the bifacial cell array includes a plurality of bifacial cells; and conductive glue is provided in the trapezoidal grooves on the lower glass layer. The present invention discloses a structure and arrangement method of a photovoltaic bifacial module, wherein the bifacial cells in the bifacial cell array are connected to each other through the conductive glue in the trapezoidal grooves, thereby optimizing the arrangement of cells, reducing shadows between cells, reducing internal resistance losses, and improving module output power.

Description

Technical Field

[0001] The present invention relates to the technical field of solar photovoltaic power generation, and in particular to a structure and arrangement method of a photovoltaic double-sided component. Background Art

[0002] In layman's terms, bifacial modules are modules that can generate electricity on both the front and back sides. The front side of the module receives direct sunlight to generate electricity, and the back side generates electricity by absorbing reflected light from the background and scattered light from the surroundings. The shingled technology (also known as stacking technology) closely arranges photovoltaic cells in a series-parallel structure, so that more than 13% more cells can be placed per unit area than conventional modules. Therefore, shingled modules have the characteristics of high output power, low internal loss, and small reverse current hot spot effect.

[0003] Current bifacial shingled modules have the following problems:

[0004] Poor optimization of battery string arrangement: Traditional bifacial modules are made of single-cell battery strings welded in series, resulting in a large internal resistance of the bifacial modules. At the same time, the distance between the battery cells is large, and the space utilization rate is low, resulting in a large power loss inside the bifacial modules.

[0005] Battery cell series mismatch: Traditional modules are composed of battery cells connected in series. Due to factors such as manufacturing and construction, a single battery cell is damaged and fails to generate electricity, affecting the normal power generation of other battery cells in the series.

[0006] Solar cell shadowing: The shingling technology is to stack the electrodes of a solar cell on top of the electrodes of another solar cell, with conductive glue in between to conduct electricity. Since some areas of the solar cells overlap each other, the lower solar cell will inevitably be shaded by the upper solar cell, causing shading and reducing the utilization area of ​​the solar cell. Summary of the invention

[0007] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a structure and arrangement method of a photovoltaic bifacial module to solve the problems of poor optimization of battery string arrangement, battery series mismatch and shadow occlusion between battery cells caused by shingling technology.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] On the one hand, the present invention provides a structure of a bifacial photovoltaic module, comprising: an upper layer of glass, a bifacial cell array and a lower layer of glass; the upper layer of glass, the bifacial cell array and the lower layer of glass are arranged in sequence from top to bottom; a plurality of trapezoidal grooves are provided on the lower layer of glass; the bifacial cell array comprises a plurality of bifacial cells.

[0010] Furthermore, the depth of the trapezoidal groove is less than one eighth of the thickness of the lower layer of glass.

[0011] Furthermore, the spacing between adjacent trapezoidal grooves is the width of a single double-sided solar cell.

[0012] Furthermore, conductive glue is provided in the trapezoidal groove on the lower layer of glass.

[0013] Furthermore, the plurality of trapezoidal grooves include a plurality of trapezoidal grooves extending laterally; the double-sided battery cell array includes at least a first double-sided battery cell, a second double-sided battery cell and a third double-sided battery cell; the first double-sided battery cell and the second double-sided battery cell are connected via conductive glue in the trapezoidal grooves extending laterally; the first double-sided battery cell and the third double-sided battery cell are connected via conductive glue in the trapezoidal grooves extending laterally.

[0014] Furthermore, the width of the trapezoidal groove is greater than the distance between the electrode of the first double-sided battery cell and the electrode of the second double-sided battery cell.

[0015] On the other hand, the present invention provides a method for arranging bifacial photovoltaic modules, based on the structure of the bifacial photovoltaic modules described above, comprising:

[0016] In the double-sided cell array, the first double-sided cell and the second double-sided cell are arranged on the lower glass in the longitudinal direction, and the first double-sided cell and the second double-sided cell are arranged closely together; the electrodes at the connection point between the first double-sided cell and the second double-sided cell are different electrodes, and the first double-sided cell and the second double-sided cell are connected in series through the conductive glue in the trapezoidal groove;

[0017] The first double-sided cell and the third double-sided cell are arranged on the lower layer of glass in the lateral direction, and the first double-sided cell and the third double-sided cell are arranged closely together; the electrodes at the connection points of the first double-sided cell and the third double-sided cell are the same electrodes, and the first double-sided cell and the third double-sided cell are connected in parallel through the conductive glue in the trapezoidal groove.

[0018] Furthermore, the double-sided battery cell array is composed of a plurality of horizontal and a plurality of vertical double-sided battery cells arranged in a vertical direction.

[0019] Furthermore, the bifacial battery cells in the same row of the bifacial battery cell array are first connected in parallel, and then connected in series with the bifacial battery cells in the upper and lower rows.

[0020] Furthermore, the first and last rows of bifacial cells are connected to the junction box via conductive adhesive in the trapezoidal grooves.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. The present invention discloses a structure and arrangement method of a bifacial photovoltaic module. The bifacial cells in the bifacial cell array are connected to each other through conductive glue in trapezoidal grooves, which optimizes the arrangement of cell strings, reduces shadows between cells, reduces internal resistance losses, and improves module output power.

[0023] 2. The present invention integrates bifacial module technology and shingled technology. Bifacial module technology absorbs the reflected light from the background and the scattered light around it on the back, which can increase the power generation by 30% under ideal conditions. The shingled technology forms a mesh hybrid circuit connection mode, which can reduce the loss caused by power mismatch between bifacial cells, while reducing the internal resistance of the bifacial module and increasing the power generation. The integration of the two technologies has superimposed benefits, especially under complex lighting conditions such as roofs and mountains, which can increase the power generation by 40% compared with conventional modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 This is a structural diagram of a shingled bifacial module of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the lower glass of the present invention;

[0027] Figure 3 It is a schematic diagram of the double-sided solar cells of the present invention connected in series on the lower glass;

[0028] Figure 4 It is a schematic diagram of the bifacial cells of the present invention connected in parallel on the lower layer of glass;

[0029] Figure 5 It is a schematic diagram of the circuit network of the double-sided battery cell of the present invention.

[0030] Reference numerals: 1, upper glass; 2, double-sided cell array; 3, lower glass; 21, first double-sided cell; 22, second double-sided cell; 23, third double-sided cell; 31, trapezoidal groove. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0032] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0033] Example 1

[0034] like Figure 1As shown, the present invention provides a structure of a photovoltaic bifacial module, including: an upper glass layer 1, a bifacial cell array 2 and a lower glass layer 3; the upper glass layer 1, the bifacial cell array 2 and the lower glass layer 3 are arranged in sequence from top to bottom; a plurality of trapezoidal grooves 31 are provided on the lower glass layer 3; the bifacial cell array 2 includes a plurality of bifacial cells.

[0035] The gap between the upper glass 1 and the lower glass 3 can be filled with EVA, polyolefin, silica gel or polymer compounds to fill the gap.

[0036] like Figure 2 As shown, trapezoidal grooves 31 with a depth not greater than one eighth of the thickness of the lower glass 3 are formed on the lower glass 3 along the lateral direction by methods including but not limited to laser micro-engraving and chemical etching. The trapezoidal grooves 31 are arranged in the longitudinal direction, and the spacing between adjacent trapezoidal grooves 31 is the width of a single double-sided cell.

[0037] Conductive glue is provided in the trapezoidal groove 31 on the lower glass 3 .

[0038] The plurality of trapezoidal grooves 31 include a plurality of trapezoidal grooves extending in the transverse direction; the bifacial cell array 2 includes at least a first bifacial cell 21, a second bifacial cell 22 and a third bifacial cell 23; the first bifacial cell 21 and the second bifacial cell 22 are connected via the conductive glue in the trapezoidal grooves 31 extending in the transverse direction; the first bifacial cell 21 and the third bifacial cell 23 are connected via the conductive glue in the trapezoidal grooves 31 extending in the transverse direction.

[0039] The width of the trapezoidal groove 31 is greater than the distance between the electrode of the first double-sided battery cell 21 and the electrode of the second double-sided battery cell 22 .

[0040] Example 2

[0041] The present invention provides a method for arranging bifacial photovoltaic modules, comprising the following steps:

[0042] The bifacial cell array 2 is composed of 6 bifacial cells in the horizontal direction and 60 bifacial cells or 72 bifacial cells in the vertical direction.

[0043] like Figure 3 As shown, in the bifacial cell array 2, the first bifacial cell 21 and the second bifacial cell 22 are arranged on the lower glass 3 in the longitudinal direction, and the first bifacial cell 21 and the second bifacial cell 22 are arranged closely. The electrodes at the connection point between the first bifacial cell 21 and the second bifacial cell 22 are different electrodes, and the first bifacial cell 21 and the second bifacial cell 22 are connected in series through the conductive glue in the trapezoidal groove 31.

[0044] like Figure 4As shown, in the bifacial cell array 2, the first bifacial cell 21 and the third bifacial cell 23 are arranged on the lower glass 3 in the lateral direction, and the first bifacial cell 21 and the third bifacial cell 23 are arranged closely. The electrodes where the first bifacial cell 21 and the third bifacial cell 23 are connected are the same electrodes, and the first bifacial cell 21 and the third bifacial cell 23 are connected in parallel through the conductive glue in the trapezoidal groove 31.

[0045] like Figure 5 As shown, the bifacial cell array 2 is composed of multiple horizontal and multiple vertical bifacial cells arranged vertically to form a mesh hybrid circuit connection mode, that is, the bifacial cells in the same row are first connected in parallel and then connected in series with the bifacial cells in the upper and lower rows.

[0046] The first and last rows of bifacial cells are connected to the junction box via the conductive adhesive in the trapezoidal grooves 31 .

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A structure of a bifacial photovoltaic module, characterized in that: include: An upper layer of glass (1), a double-sided cell array (2) and a lower layer of glass (3); the upper layer of glass (1), the double-sided cell array (2) and the lower layer of glass (3) are arranged in sequence from top to bottom; a plurality of trapezoidal grooves (31) are provided on the lower layer of glass (3); the double-sided cell array (2) includes a plurality of double-sided cells; the depth of the trapezoidal grooves (31) is less than one eighth of the thickness of the lower layer of glass (3); the spacing between adjacent trapezoidal grooves (31) is the width of a single double-sided cell; the trapezoidal grooves (31) on the lower layer of glass (3) are provided Conductive glue is provided; the plurality of trapezoidal grooves (31) include a plurality of trapezoidal grooves extending in a transverse direction; the double-sided battery cell array (2) includes at least a first double-sided battery cell (21), a second double-sided battery cell (22) and a third double-sided battery cell (23); the first double-sided battery cell (21) and the second double-sided battery cell (22) are connected via the conductive glue in the trapezoidal grooves (31) extending in a transverse direction; and the first double-sided battery cell (21) and the third double-sided battery cell (23) are connected via the conductive glue in the trapezoidal grooves (31) extending in a transverse direction.

2. The structure of a bifacial photovoltaic module according to claim 1, characterized in that: The width of the trapezoidal groove (31) is greater than the distance between the electrode of the first double-sided battery cell (21) and the electrode of the second double-sided battery cell (22).

3. A method for arranging bifacial photovoltaic modules, characterized in that: A structure of a bifacial photovoltaic module according to claim 2, comprising: In a double-sided cell array (2), a first double-sided cell (21) and a second double-sided cell (22) are arranged on a lower layer of glass (3) in a longitudinal direction, and the first double-sided cell (21) and the second double-sided cell (22) are arranged in close proximity; electrodes at a point where the first double-sided cell (21) and the second double-sided cell (22) are connected are different electrodes, and the first double-sided cell (21) and the second double-sided cell (22) are connected in series via conductive glue in a trapezoidal groove (31); The first double-sided cell sheet (21) and the third double-sided cell sheet (23) are arranged on the lower layer of glass (3) in the horizontal direction, and the first double-sided cell sheet (21) and the third double-sided cell sheet (23) are arranged closely together; the electrodes at the connection point between the first double-sided cell sheet (21) and the third double-sided cell sheet (23) are the same electrodes, and the first double-sided cell sheet (21) and the third double-sided cell sheet (23) are connected in parallel through the conductive glue in the trapezoidal groove (31).

4. A method for arranging bifacial photovoltaic modules according to claim 3, characterized in that: The double-sided battery cell array (2) is composed of a plurality of transverse and a plurality of longitudinal double-sided battery cells arranged in a longitudinal direction.

5. The method for arranging bifacial photovoltaic modules according to claim 3, characterized in that: The bifacial battery cells in the same row of the bifacial battery cell array (2) are first connected in parallel and then connected in series with the bifacial battery cells in the upper and lower rows.

6. A method for arranging bifacial photovoltaic modules according to claim 3, characterized in that: The double-sided battery sheets in the first row and the last row are connected to the junction box via the conductive glue in the trapezoidal groove (31).

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