CN210443573U

CN210443573U - Solar cell and photovoltaic module

Info

Publication number: CN210443573U
Application number: CN201921559524.9U
Authority: CN
Inventors: 黄甫阳; 董经兵; 梅玲; 潘秀娟; 陈辉; 许涛
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: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-05-01
Anticipated expiration: 2029-09-19

Abstract

The application provides a solar cell and photovoltaic module, solar cell includes two sides that set up relatively along the first direction, at least one the side is that the non-straight line extends and this side position is formed with a plurality of protruding portions, non-straight line extends the axis symmetry setting along the first direction of this solar cell relatively of side. The solar cell is obtained by dividing a cell original sheet along a non-linearly extending dividing path, and then the side edges of a plurality of solar cells are sequentially overlapped to obtain the corresponding photovoltaic module. The area of the overlapping area of the adjacent solar cells in the photovoltaic module is reduced, the light receiving area and the output power of the single solar cell in the photovoltaic module are improved, the manufacturing cost is reduced, the manufacturing process is simpler, and the photovoltaic module is easy to realize.

Description

Solar cell and photovoltaic module

Technical Field

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

Background

The electric connection of adjacent battery piece is realized through welding the area to traditional photovoltaic module, shines the unable effective utilization that obtains of light at the clearance position of adjacent battery piece, influences the light utilization ratio. In comparison, the laminated assembly eliminates the sheet spacing between adjacent battery sheets, and does not need to provide solder strips, thereby increasing the capacity of the battery sheets per unit area, effectively improving the assembly efficiency, and attracting attention in recent years.

The long edge of above-mentioned shingle assembly usually adopts conducting resin to overlap in proper order with corresponding bar battery piece and concatenates in series and obtain the battery cluster, is limited to equipment precision, conducting resin's reliability scheduling problem, and the width of the overlap region of adjacent battery piece generally needs to exceed 1mm, and this overlap region has caused the waste of battery piece photic area, has reduced the output of subassembly. Strip-shaped battery cells with non-linear extending edges have been disclosed in the art, but the edge structure and cutting manner of the strip-shaped battery cells still need to be improved.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a solar cell and a photovoltaic module, which can increase the light receiving area of the solar cell, reduce the cost of the module and improve the conversion efficiency.

In order to achieve the above object, an embodiment of the present application provides a solar cell, including two sides that are disposed relatively along a first direction, at least one of the sides is a non-linear extension and a plurality of protruding portions are formed at the side, and the non-linear extension of the sides is disposed symmetrically with respect to the central axis of the solar cell along the first direction.

As a further improvement of the embodiment of the present application, the two sides of the solar cell both extend in a non-linear manner, and the extending manners of the two sides are consistent.

As a further improvement of the embodiment of the present application, the side edges extending non-linearly are arranged in a sinusoidal manner.

As a further improvement of the embodiment of the present application, the side edge extending non-linearly extends linearly in a second direction perpendicular to the first direction by a distance 2N +1 times a half wavelength of the sinusoidal curve.

As a further improvement of the embodiment of the application, the wavelength of the sine curve is set to be 5-15 mm, and the amplitude of the sine curve is set to be 0.3-1 mm.

As a further improvement of the embodiment of the present application, one side surface of the protruding portion is provided with a conductive pad.

As a further improvement of the embodiment of the present application, one of the side edges extends in a non-linear manner, the other side edge extends in a linear manner, a plurality of edge conductive discs arranged at intervals are formed at the position of the linearly extending side edge, the edge conductive discs and the conductive discs are in one-to-one correspondence along a first direction, and the edge conductive discs are smaller than the conductive discs.

The embodiment of the application further provides a photovoltaic module, which comprises a plurality of cell strings, wherein each cell string comprises a plurality of solar cells, the solar cells are sequentially arranged in an overlapped mode along a first direction, and protruding parts of the solar cells are at least partially stacked on the other solar cell and electrically connected with the other solar cell.

As a further improvement of the embodiment of the present application, the protruding portions of two adjacent solar cells on opposite sides correspond to each other, and the protruding portion of one of the solar cells is at least partially stacked on the protruding portion of the other solar cell.

As a further improvement of the embodiment of the present application, the photovoltaic module further includes a conductive adhesive disposed in the overlapping region of the adjacent solar cells and electrically connecting the adjacent solar cells.

The beneficial effect of this application is: by adopting the solar cell and the photovoltaic module, the protruding part formed at the side edge position can increase the light receiving area of a single solar cell in the photovoltaic module, improve the conversion efficiency and reduce the module cost; and the non-linearly extending sides are symmetrically arranged, so that the battery original sheets can be conveniently divided by adopting the same dividing path, the manufacturing process is simpler, and the realization is easy.

Drawings

FIG. 1 is a schematic structural diagram of a solar cell according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another preferred embodiment of a solar cell of the present application;

fig. 3 is a schematic front view of a cell wafer for manufacturing a solar cell of the present application;

fig. 4 is a schematic diagram of a back side structure of the battery cell of fig. 3;

fig. 5 is a schematic front structural diagram of a plurality of solar cells obtained by dividing the cell original sheet in fig. 3;

FIG. 6 is a schematic diagram of a backside structure of several of the solar cells of FIG. 5;

FIG. 7 is a schematic view of a part of the solar cell of FIG. 5 after rotation;

FIG. 8 is a schematic diagram of the structure of FIG. 7 after the solar cells are stacked in sequence at their side edges;

fig. 9 is a schematic view of the overall structure of the photovoltaic module of the present application.

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. 1 and 2, a solar cell 100 provided by the present application includes two side edges 11 oppositely disposed along a first direction, and a top edge 12 and a bottom edge 13 connecting the two side edges 11. The top edge 12 and the bottom edge 13 both extend linearly along a first direction; at least one of the side edges 11 extends in a non-linear manner, and a plurality of protruding portions 14 are sequentially arranged along a second direction perpendicular to the first direction at the position of the side edge 11, and the protruding portions 14 are used for being mutually laminated with the position of the side edge 11 of another solar cell 100.

A central axis L of the solar cell 100 along the first direction passes through a central position of one of the protruding portions 14 or between two adjacent protruding portions 14, and the protruding portions 14 are symmetrically disposed with respect to the central axis L. Here, the non-linearly extending side 11 is symmetrically disposed with respect to the central axis L, and when the solar cell 100 is rotated 180 degrees in the plane thereof, the position of the protruding portion 14 of the position of the side 11 in the second direction is unchanged, and the direction is opposite. In other words, the solar cells 100 are symmetrically disposed about the central axis L, and after rotating 180 degrees, the protruding portions 14 of the opposite sides of the solar cell 100 and another solar cell 100 with the same specification can correspond to each other one by one, so that the edge overlapping and the electrical connection of the two solar cells 100 can be realized through the corresponding protruding portions 14.

In the case of the solar cell 100 shown in fig. 2 in which both the side edges 11 extend in a non-linear manner, the extending manners of the two side edges 11 are the same, which facilitates the dividing of the solar cell 100. The side edge 11 extending non-linearly extends in a sinusoidal manner along the second direction, and of course, the side edge 11 may also be provided in a square wave shape, a saw-tooth shape, and the like, which are not described herein again.

As shown in fig. 3 to 6, the solar cell 10 is obtained by dividing the corresponding cell original sheet 10, the cell original sheet 10 is configured as a substantially rectangular crystalline silicon cell sheet, and the cell original sheet 10 has a plurality of cell units 101 arranged in a straight line in sequence along a first direction. The solar cell 100 can be obtained by dividing each cell 101 along a predetermined dividing path by the cell sheet 10.

In this embodiment, the battery original sheet 10 has six battery units 101, and any two adjacent battery units 101 are cut by using the same dividing path, so that the extending manners of the non-linearly extending side edges 10 of any one of the solar batteries 10 are consistent. The division paths of the front and back surfaces of the battery cell 10 shown in fig. 3 and 4 are only for clarity of description of the structural relationship of the battery cells 101 in the battery cell 10. For convenience of description, the six solar cells 100 corresponding to the six battery cells 101 will be referred to as solar cells a to f, respectively. The solar cells a and f correspond to the battery cells 101 located at two side edges of the battery original sheet 10, and each of the solar cells a and f has a

side edge

111a and 112f extending linearly along the second direction and a

side edge

112a and 111f extending non-linearly; the solar cells b, c, d, e have two non-linearly extending

sides

111b and 112b, 111c and 112c, 111d and 112d, and 111e and 112e, respectively.

The battery original sheet 10 is divided along a dividing path which is a sine curve, the wavelength of the sine curve is set to be 5-15 mm, the amplitude of the sine curve is set to be 0.3-1 mm, and the dividing paths are symmetrically arranged relative to a center line of the battery original sheet 10 extending along a first direction. In particular, the side edge 11 extends linearly in the second direction by a distance 2N +1 times a half wavelength of the sine curve, and the side edge 11 of the solar cell 100 is positioned to have N or N +1 protruding parts 14 arranged in sequence in the second direction. The protruding portions 14 on the opposite sides of two adjacent solar cells 100 are alternately arranged in sequence, for example, the side 112a of the solar cell a has N +1 protruding portions 14, the side 111b of the solar cell b has N protruding portions 14, and the protruding portions 14 formed by the two are alternately arranged.

One side surface of the protruding portion 14 is provided with a conductive pad, which is typically composed of a silver electrode and is prepared in a metallization process of the battery original sheet 10. The conductive pads include a front conductive pad 151 and a back conductive pad 152 respectively disposed on the front and back sides of the solar cell 100, and the front conductive pad 151 is connected to an electrode grid line (not shown) on the front side of the solar cell 100; the back conductive pad 152 is connected to the grid lines of the electrode and/or the back electric field (not shown) on the back side of the solar cell 100.

As for the cell original sheet 10, five dividing paths are arranged at intervals along the first direction, wherein 2N +1 front conductive pads 151 are respectively arranged in regions corresponding to the first, third and fifth dividing paths, and the corresponding dividing paths pass through between adjacent front conductive pads 151, so that the two divided solar cells 100 respectively have N, N +1 front conductive pads 151; the regions corresponding to the second and fourth dividing paths are respectively provided with 2N +1 back conductive pads 152, and the corresponding dividing paths also pass through between the adjacent back conductive pads 152, so that the two divided solar cells 100 respectively have N, N +1 back conductive pads 152.

The solar cells a and f are further provided with a plurality of edge conductive discs 153 arranged at intervals along the second direction at the positions of the

side edges

111a and 112f extending linearly, and the edge conductive discs 153 correspond to the conductive discs at the positions of the

side edges

112a and 111f one to one along the first direction. Here, the edge conductive pad 153 is smaller than the conductive pad. And the edge conductive plate 153 arranged at the position of the

side edges

111a and 112f is positioned at the back of the solar cells a and f.

With reference to fig. 7 to 9, the present application further provides a photovoltaic module 200, which includes a plurality of cell strings 201, and a bus bar 202 connected to and disposed at an end of the cell string 201, where the cell string 201 includes a plurality of the foregoing solar cells 100 sequentially overlapped along a first direction. The protruding portion 14 of the solar cell 100 is at least partially stacked at a side edge of another solar cell 100 and electrically connected to another solar cell 100.

The cell string 201 is formed by sequentially connecting a plurality of groups of solar cells a-f in series, when the solar cells a-f are overlapped, the positions of the solar cells a, c and e are kept unchanged, and the solar cells b, d and f are rotated by 180 degrees, so that the protruding parts 14 on the opposite sides of the adjacent solar cells 100 are in one-to-one correspondence. For example: the side 112a of the solar cell a has N +1 protruding parts 14, the side 112b of the solar cell b also has N +1 protruding parts 14, and after the solar cell b is turned over by 180 degrees, the N +1 protruding parts 14 on the side 112b correspond to the N +1 protruding parts 14 on the side 112a one-to-one. Specifically, after the solar cell f is turned over by 180 degrees, the linearly extending side 112f thereof is stacked in cooperation with the N +1 protruding portions 14 on the side 112 e.

The protruding parts 14 of the sides of the solar cell a and the solar cell b opposite to each other are stacked to form overlapping regions 161, and hollow regions 162 are further formed between the adjacent overlapping regions 161, wherein the overlapping regions 161 have a width d1 along the first direction. The overlapping region 161 and the hollow region 162 are also formed at the positions of the

side edges

112e and 112f of the solar cell e opposite to the solar cell f, where the width of the overlapping region 161 in the first direction is set as d2, and d2 is smaller than d1, so that the stacking area and the electrical contact area of the solar cell e and the solar cell f are smaller. In practical production, in order to make the current transmission in the cell string 201 more uniform and stable, the width d2 of the overlapping region 161 along the first direction may be increased when the linearly extending

side edges

111a, 112f of the solar cells a, f are matched with the adjacent solar cells 100.

The photovoltaic module 200 further includes a conductive adhesive disposed in the overlapping region 161 adjacent to the solar cell 100, specifically, the conductive adhesive is disposed between the front conductive pad 151 and the back conductive pad 152, and between the front conductive pad 151 and the edge conductive pad 153 to realize the electrical connection between the two corresponding solar cells 100.

The preparation process of the photovoltaic module 200 mainly comprises the following steps:

providing a cell original sheet 10, and dividing the cell original sheet 10 along a dividing path extending in a non-linear manner to obtain a plurality of solar cells 100;

the protruding parts 14 of the solar cells 100 are at least partially stacked at the positions of the side edges 11 of another solar cell 100, and the two solar cells 100 are electrically connected.

The cell sheet 10 is divided into at least three solar cells 100 along the same dividing path, and after a part of the solar cells 100 are rotated by 180 degrees, the solar cells 100 are overlapped with the adjacent solar cells 100 at the edges, so that the protruding parts 14 of the opposite sides of the adjacent solar cells 100 are stacked with each other, or the side edge 11 of the solar cell 100 extending in a straight line is stacked with the protruding part 14 of another solar cell 100.

In summary, in the solar cell 100 and the photovoltaic module 200 of the present application, the protruding portion 14 formed at the position of the side edge 11 can increase the light receiving area of the single solar cell 100 in the photovoltaic module 200, so as to improve the conversion efficiency; the number of the solar cells 100 in each cell string 201 can be reduced, and the assembly cost is reduced; the non-linearly extending sides of the solar cell 100 are symmetrically arranged, so that the original cell sheet 10 can be divided by adopting the same dividing path without switching the dividing path and related processes, the field efficiency is improved, the misoperation is reduced, the manufacturing process is simpler, and the realization is easy.

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. A solar cell comprises two opposite sides arranged along a first direction, and is characterized in that: at least one of the side edges extends in a non-linear manner, a plurality of protruding parts are formed at the position of the side edge, and the side edges extending in the non-linear manner are symmetrically arranged relative to the central axis of the solar cell along the first direction.

2. The solar cell according to claim 1, characterized in that: the two sides of the solar cell extend in a non-linear mode, and the extending modes of the two sides are consistent.

3. The solar cell according to claim 1, characterized in that: the side edge which extends in a non-straight line is arranged in a sine curve.

4. The solar cell according to claim 3, characterized in that: the side edge extending non-linearly extends linearly in a second direction perpendicular to the first direction over a distance of 2N +1 times a half wavelength of the sinusoid.

5. The solar cell according to claim 3, characterized in that: the wavelength of the sine curve is set to be 5-15 mm, and the amplitude of the sine curve is set to be 0.3-1 mm.

6. The solar cell according to claim 1, characterized in that: and a conductive disc is arranged on one side surface of the protruding part.

7. The solar cell according to claim 6, characterized in that: the side edge of one of the two conductive plates extends in a non-linear mode, the other side edge of the two conductive plates extends in a linear mode, a plurality of edge conductive plates which are arranged at intervals are formed in the position, extending in the linear mode, of the side edge, the edge conductive plates correspond to the conductive plates one to one in the first direction, and the edge conductive plates are smaller than the conductive plates.

8. A photovoltaic module, includes a plurality of battery cluster, its characterized in that: the cell string comprises a plurality of solar cells according to any one of claims 1 to 7, wherein a plurality of the solar cells are sequentially overlapped along a first direction, and the protruding portion of one of the solar cells is at least partially stacked on and electrically connected with another of the solar cells.

9. The photovoltaic module of claim 8, wherein: the protruding parts of the opposite sides of two adjacent solar cells are in one-to-one correspondence, and the protruding parts of one solar cell are at least partially stacked on the protruding parts of the other solar cell.

10. The photovoltaic module of claim 8, wherein: the photovoltaic module further comprises conductive adhesive which is arranged in the overlapping area of the adjacent solar cells and used for electrically connecting the adjacent solar cells.