CN210136884U

CN210136884U - Photovoltaic module

Info

Publication number: CN210136884U
Application number: CN201921424458.4U
Authority: CN
Inventors: 徐洁; 夏正月; 许涛; 邢国强
Original assignee: CSI Cells Co Ltd; CSI Solar Power Group Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: Canadian Solar Inc; CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-03-10
Anticipated expiration: 2029-08-29

Abstract

The application provides a photovoltaic module, which comprises a plurality of cell strings arranged at intervals along a first direction, wherein each cell string is provided with at least one interconnected cell sheet; the photovoltaic module further comprises an electric connecting piece used for connecting two interconnected battery pieces corresponding to the positions in the adjacent battery strings, and two ends of the electric connecting piece are respectively connected to the edge positions of one opposite side of the two interconnected battery pieces. This application is through connecting the connection of corresponding interconnected cell piece in different battery strings is realized to the electric connector of the border position of interconnected cell piece, reduces interconnected cell piece surface shading area improves conversion efficiency, still makes this photovoltaic module's outward appearance improve.

Description

Photovoltaic module

Technical Field

The application relates to the technical field of solar energy manufacturing, in particular to a photovoltaic module.

Background

In recent years, the market demand for high-power modules is growing, the laminated module does not need to be provided with welding strips, the cell capacity per unit area is increased by eliminating the space between adjacent cells, and the module efficiency is effectively improved, so that the laminated module is widely attracted by the industry. As shown in fig. 1, the above-mentioned stack assembly generally employs strip-shaped battery sheets 201 to be overlapped and serially connected in sequence to obtain corresponding battery strings 202, the battery strings 202 can be divided into three sub-strings along the longitudinal direction, different battery strings 202 are connected with each other through

bus bars

203, 204, and the sub-strings are connected in parallel at two ends of corresponding diodes through

bus bars

203, 204, 205.

For a double-sided module, the bus bar reduces the light receiving area of the back of the module, and reduces the back conversion efficiency; and the bus bar can cause the appearance difference of the front surface and the back surface of the assembly to be large, thereby influencing the appearance. In view of the above, there is a need for a new bifacial photovoltaic module.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a photovoltaic module, which can reduce the surface shading area, improve the conversion efficiency and improve the appearance of the module.

In order to achieve the above object, an embodiment of the present application provides a photovoltaic module, including a plurality of cell strings arranged at intervals along a first direction, where the cell strings have at least one interconnected cell; the photovoltaic module further comprises an electric connecting piece used for connecting two interconnected battery pieces in the adjacent battery strings, and two ends of the electric connecting piece are respectively connected to the edge positions of one opposite side of the two interconnected battery pieces.

As a further improvement of the embodiment of the application, the edge positions of one side of the two interconnected battery pieces in opposite directions are further provided with interconnected electrodes, and the electric connecting piece is connected to the interconnected electrodes.

As a further improvement of the embodiment of the present application, the interconnection electrode is disposed on the back surface of the interconnection cell, and the interconnection electrode does not exceed the coverage area of the electrical connector.

As a further improvement of the embodiment of the present application, the photovoltaic module further includes a first bus bar and a second bus bar connected to two ends of the cell string, and an intermediate bus bar connected to the interconnected cells.

As a further improvement of the embodiment of the present application, the intermediate bus bar is disposed to extend in a second direction perpendicular to the first direction.

As a further improvement of the embodiment of the present application, the photovoltaic module includes two battery packs symmetrically arranged with respect to each other along a first direction, each battery pack includes 3 battery strings; the distance between the two battery packs in the first direction is larger than the distance between the two adjacent battery strings in the battery packs in the first direction, and the intermediate bus bar is arranged between the two battery packs.

As a further improvement of the embodiment of the present application, each of the battery strings includes two interconnected battery pieces.

As a further improvement of the embodiment of the present application, the intermediate bus bar includes a third bus bar and a fourth bus bar, and the third bus bar and the fourth bus bar are respectively connected to two different interconnected battery pieces on the battery string.

As a further improvement of the embodiment of the application, the battery string comprises three sub-strings which are uniformly divided, and the interconnected battery pieces are positioned at the tail end positions of the sub-strings facing to another adjacent sub-string.

As the further improvement of this application embodiment, the battery cluster includes along a plurality of battery pieces that the second direction of perpendicular to first direction overlaps the setting in proper order, and is adjacent the overlap region of battery piece is followed the width of second direction sets up to 0.5 ~ 1.5 mm.

The beneficial effect of this application is: by adopting the photovoltaic module, the electrical connection of corresponding interconnected battery pieces in different battery strings is realized through the electrical connection pieces connected to the edge positions of the interconnected battery pieces, so that the surface shading area of the interconnected battery pieces is reduced, and the conversion efficiency is improved; and the appearances of the two sides of the photovoltaic module are more consistent, and the attractiveness of the module is improved.

Drawings

Fig. 1 is a schematic back structure diagram of a conventional photovoltaic module;

FIG. 2 is a schematic view of a backside structure of a photovoltaic module according to an embodiment of the present application;

FIG. 3 is an enlarged schematic view of region A in FIG. 2;

FIG. 4 is a schematic view of a backside structure of another preferred embodiment of a photovoltaic module of the present application;

fig. 5 is an enlarged schematic view of a region B in fig. 4.

Detailed Description

The present application will be described in detail below with reference to embodiments shown in the drawings. The present invention is not limited to the above embodiments, and structural, methodological, or functional changes made by one of ordinary skill in the art according to the present embodiments are included in the scope of the present invention.

Referring to fig. 2 and 3, a photovoltaic module 100 provided by the present application includes a plurality of cell strings 10 arranged at intervals along a first direction, and a first bus bar 21 and a second bus bar 22 respectively connected to two ends of the cell strings 10.

The battery string 10 includes a plurality of battery pieces 11 sequentially overlapped and connected in series along a second direction perpendicular to the first direction, and at least one interconnected battery piece 110 is included in the plurality of battery pieces 11. The battery piece 11 is a strip-shaped battery piece, the strip-shaped battery piece is generally obtained by splitting a whole single crystal battery piece or a polycrystalline battery piece, and the width of the overlapping area of the adjacent battery pieces 11 along the second direction is generally set to be 0.5-1.5 mm. The arrangement of the interconnected battery pieces 110 can be understood as dividing the battery string 10 into a plurality of sub-strings, and then connecting the sub-strings in the battery string 10 in parallel to different diodes, so as to better avoid hot spots or other working abnormalities of the photovoltaic module 100. Here, the battery string 10 is evenly divided into three sub-strings, in other words, the battery string 10 has two of the interconnected battery pieces 110, and the interconnected battery pieces 110 are located at the end positions of the sub-strings facing to another adjacent sub-string.

The interconnected battery sheet 110 in one of the battery strings 10 corresponds to the interconnected battery sheet 110 in another adjacent battery string 10 along a first direction, and an interconnected electrode (not shown) is arranged at an edge position of one side of the two interconnected battery sheets 110 opposite to each other. The photovoltaic module 100 further includes an electrical connector 30 for connecting two corresponding interconnected battery pieces 110 in the adjacent battery strings 10, and two ends of the electrical connector 30 are respectively connected to the interconnected electrodes on the opposite sides of the two interconnected battery pieces 110. Wherein the interconnection electrode is located on the back surface of the interconnection cell 110 and is disposed adjacent to the short edge thereof.

Generally, the interconnection electrode may be configured as a silver electrode and connected to an electrode grid line of the back surface of the interconnection cell 110. The electrical connector 30 may be configured as a conductive adhesive tape or a flexible metal sheet, and the length of the electrical connector 30 along the first direction is adapted to the pitch of the interconnection electrodes on the opposite side of the two adjacent interconnection battery pieces 110, preferably, the interconnection electrodes do not exceed the coverage area of the electrical connector 30. That is to say, the electrical connector 30 is only connected to the short edge of the interconnected cell 110, and the influence of the short edge on the light receiving area of the back surface of the interconnected cell 110 is greatly reduced, which is beneficial to improving the conversion efficiency of the back surface of the interconnected cell 110, and makes the back surface of the corresponding photovoltaic module 100 more neat and beautiful.

The photovoltaic module 100 further includes an intermediate bus bar connected to the interconnected cells 110, the intermediate bus bar extending along the second direction. In this embodiment, the photovoltaic module 100 includes two battery packs symmetrically disposed along a first direction, and each battery pack includes 3 battery strings 10. The distance between the two battery packs in the first direction is larger than the distance between two adjacent battery strings 10 in the battery packs in the first direction, the middle bus bar is arranged between the two battery packs, the influence of the middle bus bar on the light receiving area of the back of the corresponding battery piece 11 is effectively avoided, the back conversion efficiency is improved, and the appearance consistency of the front and back of the photovoltaic module 100 can be improved.

The intermediate bus bar includes a third bus bar 23 and a fourth bus bar 24, and the third bus bar 23 and the fourth bus bar 24 are respectively connected to two different interconnected battery cells 110 on the battery string 10. The photovoltaic module 100 further has an insulating spacer 40, the insulating spacer 40 being arranged in particular at the electrical connector 30 connected to the third busbar 23, in order to prevent the electrical connector 30 from being in electrical communication with the fourth busbar 24.

Here, the photovoltaic module 100 further includes a first junction box 51 and a second junction box 52 that are separately disposed and respectively located at two side edges of the photovoltaic module 100 along the second direction. The first junction box 51 has two diodes therein, the first bus bar 21 and the third bus bar 23 are connected to both ends of one of the diodes, and the third bus bar 23 and the fourth bus bar 24 are connected to both ends of the other diode; the second junction box 52 has a diode therein, and the fourth bus bar 24 and the second bus bar 22 are connected to both ends of the diode.

The present application also provides another embodiment, as shown in fig. 4 and fig. 5, which is different from the previous embodiment in that: the photovoltaic module 100 comprises a junction box 53 arranged integrally, and three diodes are arranged in the junction box 53. Here, the photovoltaic module 100 further includes a fifth bus bar 25 connected to the second bus bar 22, and the fifth bus bar 25 is also disposed between the two battery cells and extends in the second direction. The positions of the electric connectors 30 correspondingly connected with the third bus bar 23 and the fourth bus bar 24 are also provided with insulating gaskets 40, so that the corresponding electric connectors 30 are not conducted with other bus bars. Obviously, the junction box 53 may be disposed at an edge position on one side of the second bus bar 22.

In summary, the photovoltaic module 100 realizes the connection of the interconnected cells 110 in different cell strings 10 through the cooperation of the electrical connector 30 and the interconnected electrodes, so as to reduce the surface shading area of the interconnected cells 110 and improve the conversion efficiency. In addition, the photovoltaic module 100 further arranges the middle bus bar between the two battery packs, so that the appearances of the two sides of the photovoltaic module 100 are more consistent, and the aesthetic degree is improved.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.

Claims

1. The utility model provides a photovoltaic module, includes a plurality of battery strings of arranging along first direction interval which characterized in that: the battery string is provided with at least one interconnected battery piece; the photovoltaic module further comprises an electric connecting piece used for connecting two interconnected battery pieces in the adjacent battery strings, and two ends of the electric connecting piece are respectively connected to the edge positions of one opposite side of the two interconnected battery pieces.

2. The photovoltaic module of claim 1, wherein: and the edge positions of the opposite sides of the two interconnected battery pieces are also provided with interconnected electrodes, and the electric connecting piece is connected to the interconnected electrodes.

3. The photovoltaic module of claim 2, wherein: the interconnection electrode is arranged on the back surface of the interconnection battery piece, and the interconnection electrode does not exceed the coverage area of the electric connecting piece.

4. The photovoltaic module of claim 1, wherein: the photovoltaic module further comprises a first bus bar and a second bus bar which are connected to two ends of the cell string, and a middle bus bar which is connected with the interconnected cell pieces.

5. The photovoltaic module of claim 4, wherein: the intermediate bus bar extends in a second direction perpendicular to the first direction.

6. The photovoltaic module of claim 4, wherein: the photovoltaic module comprises two battery packs which are symmetrically arranged along a first direction, and each battery pack comprises 3 battery strings; the distance between the two battery packs in the first direction is larger than the distance between the two adjacent battery strings in the battery packs in the first direction, and the intermediate bus bar is arranged between the two battery packs.

7. The photovoltaic module of claim 4, wherein: each of the battery strings includes two interconnected battery pieces.

8. The photovoltaic module of claim 7, wherein: the middle bus bar comprises a third bus bar and a fourth bus bar, and the third bus bar and the fourth bus bar are respectively connected with two different interconnected battery pieces on the battery string.

9. The photovoltaic module of claim 7, wherein: the battery string comprises three sub strings which are uniformly divided, and the interconnected battery pieces are positioned at the tail end positions of the sub strings facing to another adjacent sub string.

10. The photovoltaic module of claim 1, wherein: the battery string includes along a plurality of battery pieces of perpendicular to first direction's second direction overlap setting in proper order, and is adjacent the overlap region of battery piece is followed the width of second direction sets up to 0.5 ~ 1.5 mm.