CN216311803U

CN216311803U - Structure of photovoltaic double-sided assembly

Info

Publication number: CN216311803U
Application number: CN202123086010.6U
Authority: CN
Inventors: 高培鑫; 李腾; 张立英; 吕贝
Original assignee: Huaneng Clean Energy Research Institute
Current assignee: Huaneng Clean Energy Research Institute
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-04-15
Anticipated expiration: 2031-12-08

Abstract

The utility model relates to the technical field of solar photovoltaic power generation, and particularly discloses a structure of a photovoltaic double-sided assembly, which comprises the following components: the double-sided battery piece array comprises upper layer glass, a double-sided battery piece array and lower layer glass; the upper layer glass, the double-sided battery piece array and the lower layer glass are sequentially arranged from top to bottom; a plurality of trapezoidal grooves are arranged on the lower layer glass; the double-sided battery piece array comprises a plurality of double-sided battery pieces; conductive adhesive is arranged in the trapezoidal groove on the lower layer of glass. According to the structure of the photovoltaic double-sided assembly, the double-sided battery pieces in the double-sided battery piece array are connected through the conductive adhesive in the trapezoidal grooves, the arrangement of batteries is optimized, shadow shielding among the battery pieces is reduced, internal resistance loss is reduced, and the output power of the assembly is improved.

Description

Structure of photovoltaic double-sided assembly

Technical Field

The utility model relates to the technical field of solar photovoltaic power generation, in particular to a structure of a photovoltaic double-sided assembly.

Background

The double-sided module is a module capable of generating power on the front side and the back side, wherein the front side of the module receives sunlight direct light to generate power, and the back side of the module absorbs background reflected light and surrounding scattered light to generate power. The tiling technology (also called the lamination technology) closely arranges the photovoltaic cells in a series-parallel structure, so that more than 13% of the cells of the conventional assembly can be placed in a unit area, and the tiling assembly has the characteristics of high output power, low internal loss, small reverse current hot spot effect and the like.

The current double-sided shingle assembly has the following problems:

poor optimization of the battery string arrangement: the traditional double-sided assembly is formed by welding single battery strings in series, so that the internal resistance of the double-sided assembly is large, the distance between battery pieces is large, the space utilization rate is small, and the large power loss inside the double-sided assembly is caused.

Series mismatch of battery plates: the traditional assembly is formed by serially connecting battery pieces, and because of factors such as manufacturing and construction, a single battery piece is damaged and does not generate electricity, and normal electricity generation of other battery pieces serially connected in the series is influenced.

Shading the battery piece shadow: the tiling technology is to stack the electrode of one cell plate on the electrode of another cell plate, and the middle part is connected with the conduction through a conductive adhesive. Because the partial areas of the cell pieces are mutually overlapped, the cell piece at the bottom is sheltered by the cell piece at the upper layer inevitably, and the sheltering is caused, so that the utilization area of the cell piece is reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a structure of a photovoltaic double-sided assembly, so as to solve the problems of poor arrangement optimization of cell strings, series mismatch of cell pieces and shadow shielding between the cell pieces caused by a tiling technology.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a structure of a photovoltaic double-sided assembly, which comprises: the double-sided battery piece array comprises upper layer glass, a double-sided battery piece array and lower layer glass; the upper layer glass, the double-sided battery piece array and the lower layer glass are sequentially arranged from top to bottom; a plurality of trapezoidal grooves are arranged on the lower layer glass; the double-sided battery piece array comprises a plurality of double-sided battery pieces.

Furthermore, the depth of the trapezoid groove is less than one eighth of the thickness of the lower layer of glass.

Further, the distance between the adjacent trapezoidal grooves is the width of a single double-sided battery piece.

Furthermore, a conducting resin is arranged in the trapezoidal groove on the lower layer of glass.

Further, the double-sided battery piece array is formed by a plurality of transverse double-sided battery pieces and a plurality of longitudinal double-sided battery pieces in a longitudinal direction.

Furthermore, the double-sided battery pieces in the same row in the double-sided battery piece array are arranged in parallel, and the double-sided battery pieces in the upper row and the double-sided battery piece in the lower row are arranged in series.

Further, the plurality of trapezoidal grooves comprise a plurality of trapezoidal grooves extending along the transverse direction; the double-sided battery piece array at least comprises a first double-sided battery piece, a second double-sided battery piece and a third double-sided battery piece; the first double-sided battery piece and the second double-sided battery piece are connected through conductive adhesive in the trapezoid groove extending along the transverse direction; the first double-sided battery piece and the third double-sided battery piece are connected through conductive adhesive in the trapezoid groove extending along the transverse direction.

Further, the width of the trapezoid-shaped groove is larger than the distance between the electrode of the first double-sided battery piece and the electrode of the second double-sided battery piece.

Furthermore, in the double-sided battery piece array, electrodes at the connection part of the first double-sided battery piece and the second double-sided battery piece in the longitudinal direction are different electrodes, and the first double-sided battery piece and the second double-sided battery piece are arranged in series through conductive adhesive in the trapezoidal groove;

the electrodes at the connecting part of the first double-sided battery piece and the third double-sided battery piece are the same electrodes in the transverse direction, and the first double-sided battery piece and the third double-sided battery piece are arranged in parallel through the conductive adhesive in the trapezoidal groove.

Furthermore, the double-sided battery pieces in the first row and the last row in the double-sided battery piece array are connected with the junction box through the conductive adhesive in the trapezoidal grooves.

The utility model has at least the following beneficial effects:

1. according to the structure of the photovoltaic double-sided assembly, the double-sided battery pieces in the double-sided battery piece array are connected through the conductive adhesive in the trapezoidal grooves, the arrangement of battery strings is optimized, shadow shielding among the battery pieces is reduced, internal resistance loss is reduced, and the output power of the assembly is improved.

2. The utility model integrates double-sided assembly technology and shingle technology. The double-sided assembly technology absorbs background reflected light and surrounding scattered light through the back surface, and 30% of generated energy is improved under ideal conditions. The tiling technology forms a circuit connection mode of net-shaped series-parallel connection, so that the loss caused by power mismatch between double-sided battery pieces can be reduced, the internal resistance of a double-sided assembly is reduced, and the power generation capacity is improved. The two technologies are integrated, benefits are overlapped, and especially under the complex conditions of roof, mountain land and other illumination conditions, the power generation amount can be improved by 40% compared with that of a conventional component.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a block diagram of a double-sided assembly of the present invention;

FIG. 2 is a schematic view of the structure of the lower glass of the present invention;

FIG. 3 is a schematic view of the double-sided cell sheet of the present invention connected in series on the lower glass layer;

FIG. 4 is a schematic view of the parallel connection of double-sided battery pieces on the lower glass layer according to the present invention;

fig. 5 is a schematic diagram of a double-sided battery cell circuit network of the present invention.

Reference numerals: 1. an upper layer of glass; 2. a double-sided cell array; 3. a lower layer of glass; 21. a first double-sided battery sheet; 22. a second double-sided battery sheet; 23. a third double-sided battery piece; 31. a trapezoidal groove.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The following detailed description is exemplary in nature and is intended to provide further details of the utility model. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model.

Example 1

As shown in fig. 1, the present invention provides a structure of a photovoltaic double-sided assembly, comprising: the solar cell comprises upper layer glass 1, a double-sided cell array 2 and lower layer glass 3; the upper layer glass 1, the double-sided battery piece array 2 and the lower layer glass 3 are sequentially arranged from top to bottom; a plurality of trapezoidal grooves 31 are arranged on the lower layer glass 3; the double-sided battery piece array 2 comprises a plurality of double-sided battery pieces.

EVA, polyolefin, silica gel or macromolecular compound can be filled between upper glass 1 and lower glass 3 and supplementary gap.

As shown in fig. 2, trapezoidal grooves 31 having a depth of not more than one eighth of the thickness of the lower glass 3 are formed on the lower glass 3 in the lateral direction by means of, but not limited to, laser micro-etching, chemical etching, or the like. The trapezoidal grooves 31 are arranged in the longitudinal direction, and the distance between every two adjacent trapezoidal grooves 31 is the width of a single double-sided battery piece.

Conductive adhesive is arranged in the trapezoidal groove 31 on the lower glass 3.

The plurality of trapezoidal grooves 31 include a plurality of trapezoidal grooves extending in the transverse direction; the double-sided battery piece array 2 at least comprises a first double-sided battery piece 21, a second double-sided battery piece 22 and a third double-sided battery piece 23; the first double-sided battery piece 21 and the second double-sided battery piece 22 are connected through conductive adhesive in the trapezoid-shaped groove 31 extending along the transverse direction; the first double-sided battery piece 21 and the third double-sided battery piece 23 are connected through conductive adhesive in the trapezoidal groove 31 extending along the transverse direction.

The width of the trapezoidal groove 31 is greater than the distance between the electrodes of the first double-sided battery sheet 21 and the electrodes of the second double-sided battery sheet 22.

Example 2

The utility model provides an arrangement method of photovoltaic double-sided components, which comprises the following steps:

the double-sided battery piece array 2 is composed of 6 transverse double-sided battery pieces, 60 longitudinal double-sided battery pieces or 72 longitudinal double-sided battery pieces.

As shown in fig. 3, in the double-sided battery sheet array 2, the first double-sided battery sheet 21 and the second double-sided battery sheet 22 in the longitudinal direction are disposed on the lower glass 3, and the first double-sided battery sheet 21 and the second double-sided battery sheet 22 are disposed in close contact with each other. The electrodes at the joint of the first double-sided battery piece 21 and the second double-sided battery piece 22 are different electrodes, and the first double-sided battery piece 21 and the second double-sided battery piece 22 are connected in series through the conductive adhesive in the trapezoidal groove 31.

As shown in fig. 4, in the double-sided battery sheet array 2, the first double-sided battery sheet 21 and the third double-sided battery sheet 23 in the transverse direction are arranged on the lower glass 3, and the first double-sided battery sheet 21 and the third double-sided battery sheet 23 are disposed in close contact with each other. The electrodes at the joint of the first double-sided battery piece 21 and the third double-sided battery piece 23 are the same, and the first double-sided battery piece 21 and the third double-sided battery piece 23 are connected in parallel through the conductive adhesive in the trapezoidal groove 31.

As shown in fig. 5, the double-sided battery sheet array 2 is formed by longitudinally arranging a plurality of transverse and longitudinal double-sided battery sheets to form a circuit connection manner of a mesh series-parallel connection, that is, double-sided battery sheets in the same row are firstly connected in parallel and then connected in series with double-sided battery sheets in the upper and lower rows.

The double-sided battery pieces in the first row and the last row are connected with the junction box through the conductive adhesive in the trapezoidal groove 31.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.

Claims

1. A structure of a photovoltaic bifacial assembly, comprising: the solar cell comprises upper layer glass (1), a double-sided cell array (2) and lower layer glass (3); the upper layer glass (1), the double-sided battery piece array (2) and the lower layer glass (3) are sequentially arranged from top to bottom; a plurality of trapezoidal grooves (31) are arranged on the lower layer glass (3); the double-sided battery piece array (2) comprises a plurality of double-sided battery pieces.

2. A photovoltaic bifacial module structure as claimed in claim 1, wherein said trapezoidal shaped grooves (31) have a depth less than one eighth of the thickness of the underlying glass (3).

3. A photovoltaic bifacial module structure as set forth in claim 1, wherein adjacent trapezoidal channels (31) are spaced by the width of a single bifacial cell sheet.

4. A photovoltaic bifacial module structure as claimed in claim 1, wherein said trapezoidal grooves (31) in said lower glass (3) are filled with conductive adhesive.

5. A photovoltaic bifacial module structure as set forth in claim 4, characterized in that said bifacial cell array (2) is formed by a plurality of transverse and longitudinal bifacial cells arranged in a longitudinal direction.

6. The structure of a photovoltaic bifacial module as set forth in claim 5, wherein the bifacial cell pieces in the transverse direction of the bifacial cell piece array (2) are arranged in parallel, and the bifacial cell pieces in the longitudinal direction are arranged in series.

7. A photovoltaic bifacial module structure as set forth in claim 6, wherein said plurality of trapezoidal channels (31) comprises a plurality of laterally extending trapezoidal channels; the double-sided battery piece array (2) at least comprises a first double-sided battery piece (21), a second double-sided battery piece (22) and a third double-sided battery piece (23); the first double-sided battery piece (21) is connected with the second double-sided battery piece (22) through conductive adhesive in a trapezoid groove (31) extending along the transverse direction; the first double-sided battery piece (21) and the third double-sided battery piece (23) are connected through conductive adhesive in a trapezoid groove (31) extending along the transverse direction.

8. A photovoltaic bifacial module structure as set forth in claim 7, wherein said trapezoidal groove (31) has a width greater than the distance between the electrode of the first bifacial cell sheet (21) and the electrode of the second bifacial cell sheet (22).

9. The structure of a photovoltaic double-sided assembly according to claim 8, characterized in that in the double-sided battery piece array (2), the electrodes at the connection of the first double-sided battery piece (21) and the second double-sided battery piece (22) in the longitudinal direction are different electrodes, and the first double-sided battery piece (21) and the second double-sided battery piece (22) are arranged in series through the conductive adhesive in the trapezoidal groove (31);

the electrodes at the connecting part of the first double-sided battery piece (21) and the third double-sided battery piece (23) in the transverse direction are the same, and the first double-sided battery piece (21) and the third double-sided battery piece (23) are arranged in parallel through conductive adhesive in the trapezoidal groove (31).

10. The structure of a photovoltaic bifacial module as set forth in claim 9, wherein the bifacial cells of the first and last rows of the bifacial cell array (2) are connected to the junction box by conductive adhesive in the trapezoidal groove (31).