CN112151632A

CN112151632A - Photovoltaic module

Info

Publication number: CN112151632A
Application number: CN202011107914.XA
Authority: CN
Inventors: 张春阳; 陈宏月; 周艳方
Original assignee: JA Solar Technology Yangzhou Co Ltd
Current assignee: Jingao Yangzhou New Energy Co ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2020-12-29

Abstract

At least some embodiments of the present disclosure provide a photovoltaic assembly including at least one cell string. The at least one battery string includes a plurality of battery pieces connected in series. The plurality of battery pieces comprise right-angle battery pieces and non-right-angle battery pieces. The right-angle cell piece has a first main grid electrode and a second main grid electrode extending in a first direction, and the non-right-angle cell piece has a third main grid electrode and a fourth main grid electrode extending in the first direction. The first main grid electrode of one of the mutually adjacent right-angle battery pieces is overlapped and connected with the second main grid electrode of the other one of the mutually adjacent right-angle battery pieces in an overlapping manner. The third main grid electrode of the non-right-angle cell piece in the right-angle cell piece and the non-right-angle cell piece adjacent to each other is overlapped, connected and lapped with the second main grid electrode of the right-angle cell piece in the right-angle cell piece and the non-right-angle cell piece adjacent to each other.

Description

Photovoltaic module

Technical Field

The present disclosure relates to a photovoltaic module.

Background

Small-gap and even gapless photovoltaic modules are one of the important development directions of future high-efficiency photovoltaic modules, and the remarkable characteristic is that the distance between adjacent cell sheets is reduced or eliminated inside a cell string, and the edges of the adjacent cell sheets can even be stacked to form a conductive path.

The "shingle connection manner" refers to a connection manner in which the back main gate electrode of one cell is lapped over the front main gate electrode of another cell adjacent to each other, which overlap each other in the thickness direction of the photovoltaic module, to connect the plurality of cells in series, thereby forming a cell string. For example, the battery sheet may be a divided battery sheet obtained by cutting an entire battery sheet. For example, the back main gate electrode of one cell may be electrically connected to the front main gate electrode of another cell using a conductive material such as a conductive paste without using a solder tape. The "shingle connection" is beginning to be used more and more in the production of high efficiency photovoltaic modules.

The whole cell is typically cut into a plurality of divided cells (e.g., 1/2 divided cell, 1/3 divided cell, 1/4 divided cell, 1/5 divided cell, 1/6 divided cell, etc.). However, the plurality of divided cells obtained by cutting have right-angled cells and non-right-angled cells due to the production cost and process.

The general practice of shingle assembly is: after the whole battery piece is cut, the right-angle battery piece is separately manufactured into a battery string and a component, and the rest non-right-angle battery pieces are manufactured into the battery string and the component. Due to the fact that the right-angle battery piece and the non-right-angle battery piece need to be distinguished, the scheme improves the complexity of production equipment, increases the process difficulty, and is difficult to carry out effective process iteration upgrading.

Disclosure of Invention

At least some embodiments of the present disclosure provide a photovoltaic assembly including at least one cell string. The at least one battery string includes a plurality of battery cells connected in series in a shingled connection. The plurality of battery pieces comprise right-angle battery pieces and non-right-angle battery pieces. The right-angle cell piece has a first main grid electrode and a second main grid electrode which are arranged on opposite sides of the right-angle cell piece and extend in the first direction, and the non-right-angle cell piece has a third main grid electrode and a fourth main grid electrode which are arranged on opposite sides of the non-right-angle cell piece and extend in the first direction. The non-right-angle cell piece comprises a first edge extending in the first direction and adjacent to a non-right angle, and a second edge extending in the first direction and not adjacent to a non-right angle, wherein the first edge is opposite to the second edge, the third main grid electrode is arranged close to the first edge, and the fourth main grid electrode is arranged close to the second edge. The first main grid electrode of one of the at least one pair of right-angle battery pieces adjacent to each other is overlapped with the second main grid electrode of the other of the at least one pair of right-angle battery pieces. The third main grid electrode of the non-right-angle cell piece in at least one pair of right-angle cell pieces and non-right-angle cell pieces adjacent to each other is overlapped with the second main grid electrode of the right-angle cell piece in the at least one pair of right-angle cell pieces and non-right-angle cell pieces.

Therefore, a photovoltaic module according to an embodiment of the present disclosure includes right-angle and non-right-angle cells connected in series in a shingled connection. The right-angle battery piece and the non-right-angle battery piece are not required to be distinguished and screened, and the non-right-angle battery piece and the right-angle battery piece are matched and connected in series, so that the complexity of production equipment is reduced, and the efficient process iteration upgrading is facilitated.

For example, in some embodiments, widths of the first and third main gate electrodes in a second direction perpendicular to the first direction are equal and greater than widths of the second and fourth main gate electrodes in the second direction, and widths of the second and fourth main gate electrodes are equal.

Since the width of the main grid electrode of one side (e.g., the back or front) of the right-angle cell piece and the non-right-angle cell piece is set to be greater than the width of the main grid electrode of the other side (e.g., the front or back) thereof, the positions of the back main grid electrode and the front main grid electrode of the adjacent cell pieces can be configured to overlap each other so as to be connected in series in a shingled connection regardless of the right-angle cell piece or the non-right-angle cell piece. In addition, it is not necessary to widen at least the width of the main gate electrode of each of the other sides, thereby contributing to reduction of the material cost of the main gate electrode of the other side and improvement of the power generation efficiency of the photovoltaic module. The first and third main gate electrodes are equal in width, and the second and fourth main gate electrodes are equal in width, which helps simplify the manufacturing process for forming the respective back main gates and the respective front main gates.

For example, in some embodiments, the width of the second and fourth main gate electrodes is in the range of 0.4-0.6 mm.

For example, in some embodiments, the width of the first and third main gate electrodes is in the range of 0.8-1.0 mm.

For example, in some embodiments, the overlapping width of the at least one pair of right-angled battery pieces in the second direction is less than or equal to the overlapping width of the at least one pair of right-angled battery pieces and non-right-angled battery pieces in the second direction.

Setting the overlapping width of the right-angle battery pieces adjacent to each other to be equal to the overlapping width of the right-angle battery pieces adjacent to each other and the non-right-angle battery pieces helps to make the processing of the battery pieces more suitable for the existing production machinery.

Setting the overlapping width of the right-angle cells adjacent to each other to be smaller than the overlapping width of the right-angle cells adjacent to each other and the non-right-angle cells helps to reduce the overlapping width of the adjacent right-angle cells, thereby improving the amount of light that can be received by the right-angle cells and improving the power generation efficiency of the right-angle cells.

For example, in some embodiments, the widths of the first, third, second, and fourth main gate electrodes in a second direction perpendicular to the first direction are equal. And the overlapping width of the at least one pair of right-angle battery pieces in the second direction is smaller than the overlapping width of the at least one pair of right-angle battery pieces and the non-right-angle battery pieces in the second direction.

Since the overlapping width of the right-angle battery pieces adjacent to each other is set to be smaller than the overlapping width of the right-angle battery pieces adjacent to each other and the non-right-angle battery pieces, the positions of the back main grid electrode and the front main grid electrode of the adjacent battery pieces can be configured to overlap each other regardless of the right-angle battery pieces or the non-right-angle battery pieces, so as to be connected in series in a shingled connection manner. In addition, in this case, the area of the right-angle cell pieces and the non-right-angle cell pieces that are shielded by the respective main grid electrodes, i.e., the width of the respective main grid electrodes, may also be set to be small.

For example, in some embodiments, the widths of the first, third, second, and fourth main gate electrodes are in the range of 0.4-0.6 mm.

For example, in some embodiments, the plurality of battery cells further include a connection battery cell including fifth and sixth main grid electrodes extending in the first direction and disposed on opposite sides of the connection battery cell, and an additional back main grid electrode disposed on the back of the connection battery cell, and the connection battery cell may be a right-angle battery cell or a non-right-angle battery cell.

The additional back main grid electrode may be connected to a current lead-out, such as a welding rod, for example for parallel connection between individual cell strings. The additional back side main grid electrode allows the current lead-out to be disposed on the back side of the photovoltaic module, thereby saving space, increasing the front side effective power generation area of the photovoltaic module, and contributing to the aesthetic appearance of the photovoltaic module.

For example, in some embodiments, the additional back main gate electrode includes a plurality of electrode blocks arranged at intervals in the first direction.

For example, in some embodiments, the plurality of electrode blocks are in contact with and in electrically conductive communication with the main grid electrode disposed at the back side of the connection cell, of the fifth and sixth main grid electrodes.

The plurality of electrode blocks are arranged to be in contact with the fifth main grid electrode or the sixth main grid electrode and are in conductive communication, so that the line loss inside the assembly is reduced, and the power generation efficiency of the assembly is improved.

For example, in some embodiments, the connection battery cell includes an aluminum back field disposed at a rear surface thereof, the aluminum back field extending in the first direction and contacting and electrically connecting the plurality of electrode blocks.

The aluminum back field may electrically and thermally connect the plurality of electrode blocks of the additional back main gate electrode, which helps to improve the conductive efficiency of the additional back main gate electrode, and helps to better dissipate heat generated at the electrical connection point between the additional back main gate electrode and the current lead-out member, avoiding local overheating.

For example, in some embodiments, the surface of the additional back side main gate electrode has a relief pattern for increasing the roughness of the surface.

The additional back side main gate electrode having high surface roughness can be more firmly and easily connected with the current lead-out member.

For example, in some embodiments, the at least one battery string includes a plurality of battery strings, the plurality of battery pieces of the plurality of battery strings are arranged in an array, and the additional back main gate electrodes of the plurality of battery strings, which are adjacent to each other in the second direction and to which the battery pieces are connected, are electrically connected through the current lead-out member.

For example, in some embodiments, the first main gate electrode is a distance from an edge of the right-angled cell piece that is less than the distance from the third main gate electrode to the first edge of the non-right-angled cell piece.

For example, in some embodiments, a non-right angle cell piece includes a first edge extending in a first direction having a chamfer and a second edge extending in the first direction without a chamfer, the first edge opposite the second edge, a third main gate electrode disposed proximate the first edge, and a fourth main gate electrode disposed proximate the second edge.

For example, in some embodiments, a first main grid electrode is disposed on the back side of a right-angle cell piece, a second main grid electrode is disposed on the front side of the right-angle cell piece, a third main grid electrode is disposed on the back side of a non-right-angle cell piece, and a fourth main grid electrode is disposed on the front side of the non-right-angle cell piece.

Therefore, according to the present disclosure, the following technical solutions are provided:

scheme 1, a photovoltaic module includes:

at least one battery string including a plurality of battery cells connected in series in a shingled connection,

the plurality of battery plates include right-angle battery plates and non-right-angle battery plates,

the right-angle cell piece has first and second main grid electrodes disposed on opposite sides of the right-angle cell piece and extending in a first direction, the non-right-angle cell piece has third and fourth main grid electrodes disposed on opposite sides of the non-right-angle cell piece and extending in the first direction,

the non-right-angle cell piece comprises a first edge extending in the first direction and adjacent to a non-right angle, and a second edge extending in the first direction and not adjacent to a non-right angle, wherein the first edge is opposite to the second edge, the third main grid electrode is arranged close to the first edge, the fourth main grid electrode is arranged close to the second edge,

the first main grid electrode of one of at least one pair of right-angle battery pieces adjacent to each other is overlapped with the second main grid electrode of the other of the at least one pair of right-angle battery pieces,

the third main grid electrode of the non-right-angle cell piece in at least one pair of right-angle cell pieces and non-right-angle cell pieces adjacent to each other is overlapped with the second main grid electrode of the right-angle cell piece in the at least one pair of right-angle cell pieces and non-right-angle cell pieces.

The photovoltaic module of

claim

2 or 1, wherein the right-angle cell pieces and the non-right-angle cell pieces are formed by splitting a whole cell piece.

Scheme 3, the photovoltaic module of

scheme

1 or 2, wherein,

the first and third main gate electrodes have equal widths in a second direction perpendicular to the first direction and are greater than widths of the second and fourth main gate electrodes in the second direction, and the widths of the second and fourth main gate electrodes are equal.

Scheme 4 the photovoltaic module of any of schemes 1-3, wherein,

the widths of the second main gate electrode and the fourth main gate electrode are in the range of 0.4-0.6 mm.

Scheme 5, the photovoltaic module of any of schemes 1-4, wherein,

the widths of the first and third main gate electrodes are in the range of 0.8-1.0 mm.

Scheme 6 the photovoltaic module of any of schemes 1-5, wherein,

the overlapping width of the at least one pair of right-angle battery pieces in the second direction is less than or equal to the overlapping width of the at least one pair of right-angle battery pieces and non-right-angle battery pieces in the second direction.

Scheme 7, the photovoltaic module of

scheme

1 or 2, wherein,

widths of the first, third, second and fourth main gate electrodes in a second direction perpendicular to the first direction are equal, and

the overlapping width of the at least one pair of right-angle battery pieces in the second direction is smaller than the overlapping width of the at least one pair of right-angle battery pieces and the non-right-angle battery pieces in the second direction.

Scheme 8 the photovoltaic module of scheme 7, wherein,

the widths of the first main gate electrode, the third main gate electrode, the second main gate electrode and the fourth main gate electrode are in the range of 0.4-0.6 mm.

Scheme 9 the photovoltaic module of any of schemes 1-8, wherein,

the plurality of battery pieces further comprise connection battery pieces, each connection battery piece comprises a fifth main grid electrode and a sixth main grid electrode which extend in the first direction and are arranged on opposite sides of the connection battery piece, and an additional back main grid electrode arranged on the back of the connection battery piece, and each connection battery piece is a right-angle battery piece or a non-right-angle battery piece.

The photovoltaic module of claim 10 or 9, wherein,

the additional back main gate electrode includes a plurality of electrode blocks arranged at intervals in the first direction.

Scheme 11 the photovoltaic module of scheme 10, wherein,

the plurality of electrode blocks are in contact with and in conductive communication with the main grid electrode disposed on the back surface of the connection cell, of the fifth and sixth main grid electrodes.

Scheme 12 the photovoltaic module of scheme 10, wherein,

the connection cell includes an aluminum back field disposed at a rear surface thereof, the aluminum back field extending in the first direction and contacting and electrically connecting the plurality of electrode blocks.

Scheme 13, the photovoltaic module of any of schemes 9-12, wherein,

the surface of the additional back main gate electrode has a concave-convex pattern for increasing the roughness of the surface.

Scheme 14, the photovoltaic module of any of schemes 9-13, wherein,

the at least one battery string includes a plurality of battery strings of which a plurality of battery cells are arranged in an array, and additional back main gate electrodes of the connection battery cells adjacent to each other in the second direction of the plurality of battery strings are electrically connected through a current lead-out member.

Scheme 15 the photovoltaic module of any of schemes 1-14, wherein,

the distance between the first main grid electrode and the edge of the right-angle battery piece is smaller than the distance between the third main grid electrode and the first edge of the non-right-angle battery piece.

Scheme 16, the photovoltaic module of any of schemes 1-15, wherein,

the first main grid electrode is arranged on the back face of the right-angle cell piece, the second main grid electrode is arranged on the front face of the right-angle cell piece, the third main grid electrode is arranged on the back face of the non-right-angle cell piece, and the fourth main grid electrode is arranged on the front face of the non-right-angle cell piece.

Scheme 17 discloses a monolithic photovoltaic cell comprising a front side and a back side opposite to the front side, wherein the monolithic photovoltaic cell can be split into a plurality of segmented cells, and the plurality of segmented cells comprise right-angle cells, non-right-angle cells and connecting cells, which are overlapped with each other to form a photovoltaic module;

wherein each of the right-angle battery pieces has a first main grid electrode disposed on one of front and back surfaces of the right-angle battery piece and extending in a first direction and a second main grid electrode disposed on the other of the front and back surfaces of the right-angle battery piece and extending in the first direction, respectively, the non-right-angle battery piece has a third main grid electrode disposed on one of the front and back surfaces of the non-right-angle battery piece and extending in the first direction and a fourth main grid electrode disposed on the other of the front and back surfaces of the non-right-angle battery piece and extending in the first direction,

the connection cell piece includes a fifth main gate electrode extending in the first direction and disposed on one of the front or back side of the connection cell piece and a sixth main gate electrode disposed on the other of the front or back side of the connection cell piece and an additional back side main gate electrode disposed on the back side of the connection cell piece.

The monolithic photovoltaic cell sheet of scheme 18 of claim 17, wherein the widths of the first and third main gate electrodes in a second direction perpendicular to the first direction are equal and greater than the widths of the second and fourth main gate electrodes in the second direction, the widths of the second and fourth main gate electrodes being equal.

The monolithic photovoltaic cell sheet of

scheme

19, 18, wherein the width of the first and third main gate electrodes is in the range of 0.8mm to 1.0mm, and/or the width of the second and fourth main gate electrodes is in the range of 0.4mm to 0.6 mm.

The monolithic photovoltaic cell sheet of scheme 20 or 17, wherein the distance of the third main gate electrode from the first edge is greater than the distance of the fourth main gate electrode from the second edge.

Scheme 21, a method of manufacturing a photovoltaic module, comprising:

splitting the whole photovoltaic cell piece according to any one of aspects 17 to 20 into a plurality of split cell pieces comprising at least one right-angle cell piece, at least one non-right-angle cell piece and at least one connecting cell piece;

overlapping the plurality of segmented cell segments to form a photovoltaic module,

wherein overlapping the plurality of segmented battery pieces comprises overlapping a first main grid electrode of one of at least one pair of right-angle battery pieces adjacent to each other with a second main grid electrode of the other of the at least one pair of right-angle battery pieces,

the third main grid electrode of the non-right-angle cell piece in at least one pair of right-angle cell pieces and non-right-angle cell pieces adjacent to each other is overlapped with the second main grid electrode of the right-angle cell piece in the at least one pair of right-angle cell pieces and non-right-angle cell pieces

At least one pair of right-angle battery pieces adjacent to each other and the first main grid electrode or the second main grid electrode connecting the right-angle battery pieces in the battery pieces are overlapped with the sixth main grid electrode or the fifth main grid electrode connecting the battery pieces.

The manufacturing method according to claim 22 or 21, further comprising: and electrically connecting the additional back main gate electrodes of the connection cells adjacent to each other in the second direction through a current lead-out member.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort.

Fig. 1 shows a schematic view of the back side of a monolithic cell sheet according to an embodiment of the present disclosure;

3 FIG. 32 3 shows 3 a 3 cross 3- 3 sectional 3 schematic 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 in 3 FIG. 31 3; 3

FIG. 3 shows a cross-sectional schematic view taken along line B-B in FIG. 1;

fig. 4 is a schematic cross-sectional view illustrating that two first battery sheets in fig. 1 are connected by a shingle connection;

fig. 5 is a schematic cross-sectional view illustrating that the first cell sheet and the second cell sheet of fig. 1 are connected by a shingle connection;

fig. 6 shows a schematic cross-sectional view of two first battery sheets connected by a shingle connection according to another embodiment of the present disclosure;

FIG. 7 shows a schematic view of a photovoltaic module fabricated using the monolithic cell sheet of FIG. 1;

FIG. 8 shows a close-up view of the circled portion in FIG. 7;

FIG. 9 shows a schematic electrical connection diagram of a cell sheet of the photovoltaic assembly of FIG. 7;

fig. 10 shows a schematic view of the back side of a monolithic cell sheet according to another embodiment of the present disclosure;

FIG. 11 shows a close-up view of the circled portion of FIG. 10;

fig. 12 is a schematic cross-sectional view illustrating that two first battery sheets in fig. 10 are connected by a shingle connection;

fig. 13 is a schematic cross-sectional view illustrating that the first cell sheet and the second cell sheet of fig. 10 are connected by a shingle connection;

fig. 14 shows a schematic view of a photovoltaic module fabricated using the monolithic cell sheet of fig. 10;

fig. 15 shows a schematic view of the back side of a monolithic cell sheet according to another embodiment of the present disclosure;

fig. 16 shows a schematic view of a photovoltaic module fabricated using the monolithic cell sheet of fig. 15.

Detailed Description

Hereinafter, a photovoltaic module according to an embodiment of the present disclosure is described in detail with reference to the accompanying drawings. To make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.

Thus, the following detailed description of the embodiments of the present disclosure, presented in conjunction with the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Photovoltaic modules are generally plate-like or sheet-like, extending substantially in a plane and having a certain thickness. For convenience and clarity in describing the photovoltaic module according to the present disclosure, a direction perpendicular to a plane in which the photovoltaic module extends is defined as a "thickness direction". Further, in the description herein and the appended claims, a "right-angled battery cell" is defined as a battery cell having a regular rectangular shape, and a "non-right-angled battery cell" is defined as a battery cell having no regular rectangular shape, i.e., a battery cell having a non-right angle, including, for example, a "chamfered battery cell" which is a substantially rectangular battery cell having a chamfer at least one corner.

In the laminated assembly, the battery pieces adjacent to each other in the battery string are connected by means of laminated connection. The "shingle connection mode" is defined as a connection mode in which the back main grid electrode of one cell is overlapped with the front main grid electrode of another adjacent cell in the thickness direction of the photovoltaic module. The non-right-angle cell has a notch such as a chamfer, and the distance from the main grid electrode on one side (back or front) to the edge of the cell (i.e., the edge of the cell to which the main grid electrode is close) is larger than the distance from the main grid electrode on the same side of the right-angle cell to the edge of the cell, so that the main grid electrodes of the right-angle cell and the non-right-angle cell are not easily aligned when the right-angle cell and the non-right-angle cell are overlapped, and the connection is not easy or is poor. Thus, as mentioned above, the stack assembly is typically done by: and the right-angle segmented battery pieces are separately manufactured into a battery string and a component, and the rest non-right-angle segmented battery pieces are manufactured into the battery string and the component.

At least some embodiments of the present disclosure provide a photovoltaic assembly including at least one cell string. The at least one battery string includes a plurality of battery cells connected in series in a shingled connection. The plurality of battery pieces comprise right-angle battery pieces and non-right-angle battery pieces. The right-angle cell piece has first and second main grid electrodes disposed on opposite sides (i.e., front and back sides) of the right-angle cell piece and extending in a first direction, and the non-right-angle cell piece has third and fourth main grid electrodes disposed on opposite sides (i.e., front and back sides) of the non-right-angle cell piece and extending in the first direction. The non-right-angle cell piece comprises a first edge extending in the first direction and adjacent to a non-right angle, and a second edge extending in the first direction and not adjacent to a non-right angle, wherein the first edge is opposite to the second edge, the third main grid electrode is arranged close to the first edge, and the fourth main grid electrode is arranged close to the second edge. The first main grid electrode of one of the at least one pair of right-angle battery pieces adjacent to each other is overlapped with the second main grid electrode of the other of the at least one pair of right-angle battery pieces. The third main grid electrode of the non-right-angle cell piece in the at least one pair of right-angle cell pieces and non-right-angle cell pieces adjacent to each other is overlapped with the second main grid electrode of the right-angle cell piece in the at least one pair of right-angle cell pieces and non-right-angle cell pieces.

Therefore, a photovoltaic module according to an embodiment of the present disclosure has right-angle cells and non-right-angle cells connected in series in a shingled connection. The right-angle battery piece and the non-right-angle battery piece do not need to be distinguished and screened, the non-right-angle battery piece is matched with the right-angle battery piece, the complexity of production equipment is reduced, and effective process iteration upgrading is facilitated.

There is a battery string having right-angled battery pieces and non-right-angled battery pieces connected in series. In order to adapt the right-angle cell pieces and the non-right-angle cell pieces, the corresponding front main grid electrodes and the corresponding back main grid electrodes of the right-angle cell pieces and the non-right-angle cell pieces are widened, and the overlapping distance between the adjacent cell pieces is increased. For example, the width of the front and back main gate electrodes is greater than 1.0mm, for example, in the range of 1.0-1.5 mm. Thus, the cost of the photovoltaic module is increased, the power generation efficiency is reduced, and the performance of the photovoltaic module is sacrificed.

In some embodiments of the present disclosure, the width of the back main grid electrode of the right-angle cell piece and the non-right-angle cell piece is set to be greater than the width of the front main grid electrode thereof or the width of the front main grid electrode of the right-angle cell piece and the non-right-angle cell piece is set to be greater than the width of the back main grid electrode thereof. That is, only the width of the back surface main gate electrode is widened while the width of the front surface main gate electrode is kept small, or only the width of the front surface main gate electrode is widened while the width of the back surface main gate electrode is kept small. Since the width of the main gate electrode (the first main gate electrode and the third main gate electrode) of one side surface is widened, and particularly, the main gate electrode (the first main gate electrode) of the one side surface of the right-angle cell piece is extended in a direction away from the edge of the right-angle cell piece, the positions of the back main gate electrode and the front main gate electrode of the adjacent cell piece can be configured to overlap each other regardless of the right-angle cell piece or the non-right-angle cell piece, so as to be connected in series in a shingled connection manner. Due to the fact that the width of the main grid electrode (the second main grid electrode and the fourth main grid electrode) on the other side face is small, material cost is reduced, and power generation efficiency loss of the photovoltaic module is reduced.

For example, the widths of the second and fourth main gate electrodes may be in the range of 0.4-0.6mm, and the widths of the first and third main gate electrodes may be in the range of 0.8-1.0 mm.

Further, in some embodiments of the present disclosure, widths of the first, third, second, and fourth main gate electrodes in a second direction perpendicular to the first direction are equal. And the overlapping width of the at least one pair of right-angle battery pieces adjacent to each other in the second direction is smaller than the overlapping width of the right-angle battery pieces adjacent to each other and the non-right-angle battery pieces in the second direction.

In this case, therefore, the positions of the back main grid electrode and the front main grid electrode of the adjacent cell pieces may be configured to overlap each other so as to be connected in series in a shingled connection regardless of the right-angle cell pieces or the non-right-angle cell pieces. In addition, in this case, the area of the right-angle cell pieces and the non-right-angle cell pieces blocked by the respective main grid electrodes, i.e., the width of the respective main grid electrodes, may also be set small, thereby improving the power generation efficiency.

For example, the widths of the second, fourth, first and third main gate electrodes may be in the range of 0.4-0.6 mm.

3 fig. 31 3 shows 3 a 3 schematic 3 view 3 of 3 the 3 back 3 side 3 of 3 a 3 full 3- 3 sheet 3 cell 3 according 3 to 3 an 3 embodiment 3 of 3 the 3 present 3 disclosure 3 ( 3 components 3 such 3 as 3 a 3 fine 3 grid 3 are 3 omitted 3 for 3 clarity 3) 3, 3 and 3 fig. 32 3 shows 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 in 3 fig. 31 3; 3 Fig. 3 shows a schematic cross-sectional view taken along the line B-B in fig. 1. As shown in fig. 1, the whole cell piece can be a 158.75m P-type square single crystal cell piece with small chamfers, which can be cut into two non-right-angle cell pieces with chamfers at two sides and three rectangular right-angle cell pieces in the middle. For example, in order to equalize the areas of the respective cells and thus the short-circuit currents (by less than 2%), the width of the non-right-angle cell is set to be greater than the width of the right-angle cell, but is not limited thereto.

As shown in fig. 1 to 3, the right-angled battery piece serves as a first battery piece 1, one of the non-right-angled battery pieces serves as a second battery piece 2, and the other serves as a third battery piece 3, i.e., a connection battery piece. The first cell piece 1 includes a first main gate electrode 11 on a rear surface thereof and a second main gate electrode 12 on a front surface thereof. The second cell piece 2 includes a third main gate electrode 21 on the rear surface thereof and a fourth main gate electrode 22 on the front surface thereof. The third cell piece 3 includes a fifth main gate electrode 31 on the rear surface thereof, an additional rear main gate electrode 33, and a sixth main gate electrode 32 on the front surface thereof. Each main gate electrode extends in a first direction (up-down direction in fig. 1).

The back side of the cell sheet is opposite to the front side, "front side" may be defined as the side facing a light source such as the sun when the cell sheet is assembled to a photovoltaic module, and "back side" may be defined as the side facing away from the light source such as the sun when the cell sheet is assembled to a photovoltaic module. In the manufacturing process of the cell, insulating films are plated on the front side and the back side of the cell, and then corresponding main grid electrodes are formed on the insulating films through steps such as coating slurry containing silver particles and drying, wherein the main grid electrodes on one side (the front side or the back side) of the non-right-angle cell are arranged close to the edges of adjacent chamfers (non-right angles) of the non-right-angle cell. The main gate electrode is placed at a distance from the cell edge to avoid degradation of electrical performance. The distance (e.g., in the range of 300-600 μm) of the main gate electrode of the right-angle cell piece near the edge of the adjoining chamfer is greater than the distance (e.g., in the range of 0-300 μm) of the main gate electrode of the right-angle cell piece from the corresponding edge of the right-angle cell piece.

In the present embodiment, the third main gate electrode 21 is disposed near a first edge of the second cell piece 2 adjacent to the chamfer, the fourth main gate electrode 22 is disposed near a second edge of the second cell piece 2 opposite to the first edge not adjacent to the chamfer, the fifth main gate electrode 31 is disposed near an edge of the third cell piece 3 adjacent to the chamfer, and the sixth main gate electrode 32 is disposed near an opposite edge of the third cell piece 3 not adjacent to the chamfer. Therefore, the third main gate electrode 21 of the second cell piece 2 and the fifth main gate electrode 31 of the third cell piece 3, which are non-right angle cell pieces, are more distant from the edges of the respective cell pieces than the first main gate electrode 11 of the first cell piece 1, which is a right angle cell piece, is distant from the edges of the first cell piece 1.

In the present embodiment, in order to better adapt the first cell piece 1 to the second cell piece 2 and the third cell piece 3 to connect the respective cell pieces in series, the front main gate electrodes (the second main gate electrode, the fourth main gate electrode, the sixth main gate electrode) and the back main gate electrodes (the first main gate electrode, the third main gate electrode, the fifth main gate electrode) of the respective cell pieces are respectively disposed to have a first width and a second width larger than the first width in a second direction (the left-right direction in fig. 1 to 3) perpendicular to the first direction. That is, each of the rear main gate electrodes, particularly the first main gate electrode 11, is extended and widened toward a direction away from the edge of the first cell piece 1. For example, the first width may be in the range of 0.4-0.6mm and the second width may be in the range of 0.8-1.0 mm.

For example, in one example, the width of the second and fourth

main gate electrodes

12 and 22 is 0.5mm, the width of the first and third

main gate electrodes

11 and 21 is 1.0mm, the distance from the first main gate electrode 11 to the edge of the first cell piece 1 is 0.25mm, and the distance from the third main gate electrode 21 to the edge of the second cell piece 2 is 0.5 mm.

Fig. 4 is a schematic cross-sectional view illustrating that two first battery sheets 1 in fig. 1 are connected by a shingled connection. As shown in fig. 4, the second main gate electrode 12 of one first cell piece 1 is overlapped to the first main gate electrode 11 of another first cell piece 1.

Fig. 5 is a schematic cross-sectional view illustrating that the first cell sheet 1 and the second cell sheet 2 of fig. 1 are connected by a shingle connection. As shown in fig. 5, the second main gate electrode 12 of the first cell piece 1 is overlapped to the third main gate electrode 21 of the second cell piece 2.

For example, two main gate electrodes overlapping each other may be connected to each other by a conductive glue (not shown).

As can be seen from fig. 4 and 5, since the first and third

main grid electrodes

11 and 21 are widened, either the first main grid electrode 11 of the first cell piece 1, which is a right-angle cell piece, or the third main grid electrode 21 of the second cell piece 2, which is a non-right-angle cell piece, may overlap the second main grid electrode 12 of another first cell piece 1. Therefore, in the present embodiment, the widened design of the back main grid electrode of each cell can simplify the complexity of the design and assembly of the cell, allowing different types (right-angled and non-right-angled cells) of cell stack connections. In addition, the second and fourth

main gate electrodes

12 and 22 have a smaller second width, which is smaller than the first width of the first and third

main gate electrodes

11 and 21. Thus, the second and fourth

main gate electrodes

12 and 22 having a smaller width save material costs (e.g., the electrode material includes noble metal silver), reducing the manufacturing costs of the photovoltaic module. In addition, although a part of the front surface of the first cell piece 1 positioned at the upper portion in the drawing is shielded by the first cell piece 1 or the second cell piece 2 positioned at the lower portion, light is still obliquely incident into a region not covered by the second main gate electrode 12 under an actual power generation environment. Therefore, the second and fourth

main gate electrodes

12 and 22 having a smaller width also contribute to an improvement in the actual power generation efficiency of the cell sheet and the photovoltaic module including the same.

In addition, the fifth main gate electrode 31 of the third cell piece 3, which is also a non-right-angle cell piece as the second cell piece 2, may be connected to the second main gate electrode 11 of the first cell piece 1 similarly as shown in fig. 5.

In addition, the first main gate electrode 11 of the first cell piece 1 may be connected to the fourth main gate electrode 21 of the second cell piece 2 or the sixth main gate electrode 31 of the third cell piece 3 similarly as shown in fig. 4.

Furthermore, an additional back main grid electrode 33 may also be provided on one first cell piece 1 to form a further third cell piece 3, such third cell piece 3 being a right-angled cell piece.

In the present embodiment, the widths of the first main gate electrode 11 of the first cell piece 1, the third main gate electrode 21 of the second cell piece 2, and the fifth main gate electrode 31 of the third cell piece 3 are set to be equal. In addition, the widths of the second main gate electrode 12 of the first cell piece 1, the fourth main gate electrode 22 of the second cell piece 2, and the sixth main gate electrode 32 of the third cell piece 3 are set to be equal. Therefore, when each back main gate electrode or each front main gate electrode is formed, there is no need to distinguish each type of cell, which helps to simplify the process flow and reduce the process cost.

In addition, in the embodiment shown in fig. 4 and 5, the overlapping width of two adjacent first battery pieces 1 in the second direction is equal to the overlapping width of the adjacent first battery pieces 1 and the adjacent second battery pieces 2 in the second direction. Such equal overlap widths help to adapt to existing processing machinery.

Fig. 6 shows a schematic cross-sectional view of two first battery sheets 1 connected by a shingle connection according to another embodiment of the present disclosure. As shown in fig. 6, in this embodiment, the overlapping width of two first cell pieces 1 is reduced to be smaller than the overlapping width of the adjacent first cell piece 1 and second cell piece 2 in the second direction, so that the area of the front surface of the upper first cell piece 1 shielded by the lower second cell piece 2 is reduced, and the power generation efficiency of the photovoltaic module is further improved.

It should be noted that, in the above-described embodiment, the first main grid electrode 11 and the second main grid electrode 12 are respectively disposed on the back surface and the front surface of the first cell piece 1, the third main grid electrode 21 and the fourth main grid electrode 22 are respectively disposed on the back surface and the front surface of the second cell piece 2, and the fifth main grid electrode 31 and the sixth main grid electrode 32 are respectively disposed on the back surface and the front surface of the third cell piece 3. However, in other embodiments, the first and second

main grid electrodes

11 and 12 may be disposed on the front and back surfaces of the first cell piece 1, the third and fourth

main grid electrodes

21 and 22 may be disposed on the front and back surfaces of the second cell piece 2, and the fifth and sixth

main grid electrodes

31 and 32 may be disposed on the front and back surfaces of the third cell piece 3. In this case, the front main gate electrode may be widened.

Fig. 7 shows a schematic diagram of a photovoltaic module fabricated by using the whole cell sheet in fig. 1, fig. 8 shows a partial enlarged view of a circled portion in fig. 7, and fig. 9 shows an electrical connection schematic diagram of the cell sheet of the photovoltaic module of fig. 7.

The steps of manufacturing the photovoltaic module shown in fig. 7-9 by using the small cell sheet obtained after the whole cell sheet shown in fig. 1 is split comprise:

s11, pre-cutting the whole battery into 5 cut battery pieces, including 3

first battery pieces

1, 1 second battery piece, and 1 third battery piece 3, as shown in fig. 1;

s12, coating conductive glue on the corresponding back main gate electrodes (the first main gate electrode 11, the third main gate electrode 21, and the fifth main gate electrode 31) of the cell by using a screen printing method, and splitting the cell to form 5 independent cells;

s13, putting the battery pieces on one another and connecting the battery pieces together in series in a lamination connection mode to form 6 strings of battery pieces, wherein each string of battery pieces is connected with 56 battery pieces in series, and each string of battery pieces comprises a first battery piece 1, a second battery piece 2 and a third battery piece 3, wherein 19 th, 38 th and 56 th battery pieces are selected as the third battery piece 3;

s14, laying a first packaging adhesive film on the front board, arranging 6 strings of the battery strings as shown in fig. 7 and 9 and laying the battery strings on the first packaging adhesive film;

s15, connecting the front main grid electrode (negative electrode) of the first cell of each cell string with the current lead-out member 4;

s16, connecting the additional back main grid electrodes 33 of the 19 th, 38 th and 56 th cells in each cell string using the current lead-out 4;

and S17, arranging an electrode leading-out terminal, laying a second packaging adhesive film and a back plate with a black coating, and carrying out EL test, lamination, framing, junction box installation and the like.

In the step S12, the conductive paste may be applied after the splitting, and the application may be screen printing, pneumatic dispensing, or the like. In addition, a conductive glue may also be applied at the respective front side main gate electrodes (the second main gate electrode 12, the fourth main gate electrode 22, and the sixth main gate electrode 32).

In the above step S13, the adjacent battery cells are connected in series by heat-curing the conductive paste applied in the step S12. Adjacent cells may be laminated together as shown, for example, in fig. 4 and 5.

In the above step S16, the additional back main gate electrode 33 is used to connect the adjacent third battery pieces 3 in the respective battery strings by the current lead-out member 4 to connect the respective battery strings in parallel.

In the above steps S15 and S16, the current lead-out members 4 used may be the same or different.

The current lead-out 4 may be a solder strip which may be connected to the additional back main gate electrode 33 by means of soldering or gluing with conductive glue or the like. Furthermore, a black coating may be provided on the current lead-out 4 to reduce reflections and increase aesthetics.

For example, the additional back main gate electrode 33 may be a plurality of electrode blocks arranged at intervals from each other in the first direction. In other examples, the additional back main gate electrode 33 may be a continuous long strip. The plurality of electrode blocks arranged at intervals from each other contributes to saving material costs compared to the continuous elongated additional back main gate electrode 33. As can be seen from the above manufacturing process, the additional back main gate electrode 33 of the third cell piece 3 may be used to connect with the current lead-out 4 in order to couple the individual cells in series-parallel. Since the additional back main gate electrode 33 is disposed on the back side of the third cell 3, it saves space, increases the front effective power generation area of the photovoltaic module, and in addition, contributes to improving the aesthetic appearance of the photovoltaic module. For example, a shingle assembly having a black front appearance can be ultimately produced.

It is noted that the present disclosure is not limited to the third cell having only one additional back side main gate electrode 33, and it may have a plurality of additional back side main gate electrodes 33.

Fig. 10 shows a schematic view of the back side of a full sheet of battery cells according to another embodiment of the present disclosure. As shown in fig. 10, the whole cell piece can be a 158.75mm P-type single crystal double-sided PERC cell piece with small chamfers, which can be cut into two non-right-angled cell pieces with chamfers at two sides and three rectangular right-angled cell pieces in the middle. For example, in order to equalize the area of each cell and thus the short-circuit current, the width of the non-right-angle cell is set to be greater than that of the right-angle cell, but is not limited thereto.

In the present embodiment, two of the right-angle battery pieces may be used as the first battery piece 1, both of the non-right-angle battery pieces may be used as the second battery piece 2, and the other of the right-angle battery pieces may be used as the third battery piece 3, i.e., the connection battery piece. The first cell piece 1 includes a first main gate electrode 11 on a rear surface thereof and a second main gate electrode 12 on a front surface thereof. The second cell piece 2 includes a third main gate electrode 21 on the rear surface thereof and a fourth main gate electrode 22 on the front surface thereof. The third cell piece 3 includes a fifth main gate electrode 31 on the rear surface thereof, an additional rear main gate electrode 33, and a sixth main gate electrode 32 on the front surface thereof. Each main gate electrode extends in a first direction (up-down direction in fig. 10). The third main grid electrode 21 of the non-right-angle cell piece is arranged close to a first edge of the adjoining chamfer, and the third main grid electrode 21 of the second cell piece 2 as the non-right-angle cell piece is at a greater distance from the cell edge than the first cell piece 1 and the third cell piece 3 as the right-angle cell pieces.

It should be noted that, in the present embodiment, the first main grid electrode 11 and the second main grid electrode 12 are respectively disposed on the back surface and the front surface of the first cell piece 1, the third main grid electrode 21 and the fourth main grid electrode 22 are respectively disposed on the back surface and the front surface of the second cell piece 2, and the fifth main grid electrode 31 and the sixth main grid electrode 32 are respectively disposed on the back surface and the front surface of the third cell piece 3. However, in other embodiments, the first and second

main grid electrodes

31 and 32 may be disposed on the front and back surfaces of the third cell piece 3.

In order to further reduce the material cost of the main grid electrode and reduce the area of each cell covered by the main grid electrode so as to improve the power generation efficiency of the photovoltaic module. In the present embodiment, the front and rear main grid electrodes of each cell are respectively set to have the same small width, for example, in the range of 0.4-0.6 mm.

Fig. 12 is a schematic cross-sectional view illustrating that two first battery sheets 1 of fig. 10 are connected by a shingle connection. Fig. 13 is a schematic sectional view illustrating that the first cell sheet 1 and the second cell sheet 2 of fig. 10 are connected by a shingle connection. As shown in fig. 12, the second main gate electrode 12 of one first cell piece 1 is overlapped to the first main gate electrode 11 of another first cell piece 1. As shown in fig. 13, the second main gate electrode 12 of the first cell piece 1 is overlapped to the third main gate electrode 21 of the second cell piece 2.

As shown in fig. 12 and 13, the overlapping width of two adjacent first battery pieces 1 in the second direction is smaller than the overlapping width of the adjacent first battery pieces 1 and the adjacent second battery pieces 2 in the second direction. Therefore, the positions of the back main grid electrode and the front main grid electrode of the adjacent cell pieces can be configured to be overlapped and connected with each other so as to be connected in series in a shingled connection manner, regardless of the right-angle cell pieces or the non-right-angle cell pieces.

When the lamination connection is performed, the corresponding back and front main grid electrodes may be recognized (e.g., image recognition) and aligned by a processing machine to overlap and connect the back and front main grid electrodes. For example, the widths of the first, third, second, and fourth main gate electrodes may be equal.

In addition, a third battery plate 3, which is also a right-angle battery plate, may be connected to the first battery plate 1 in a similar manner to fig. 12.

In addition, the first main gate electrode 11 of the first cell piece 1 or the fifth main gate electrode 31 of the third cell piece 3 may be connected with the fourth main gate electrode 22 of the second cell piece 2 in a similar manner to fig. 13.

In addition, the sixth main grid electrode 32 of the third cell piece 3, which is also a right-angle cell piece as the first cell piece 1, may be connected to the third main grid electrode 21 of the second cell piece 2 similarly to that shown in fig. 13.

In addition, the additional back main grid electrode 33 may be disposed on a second cell piece 2 to form another third cell piece 3, such third cell piece 3 being a non-rectangular cell piece.

Fig. 11 shows a partially enlarged view of the circled portion in fig. 10. As shown in fig. 10 and 11, the additional rear main grid electrode 33 includes a plurality of electrode blocks arranged at intervals in the first direction, and the third cell piece 3 further includes an aluminum back field 34 extending in the first direction and disposed on the rear surface of the third cell piece 3. The aluminum back field 34 contacts and connects the plurality of electrode blocks.

Since the aluminum back field 34 can electrically and thermally connect the plurality of electrode blocks of the additional back main gate electrode 33, it helps to improve the conductive efficiency of the additional back main gate electrode 33 and to better dissipate heat generated at the electrical connection point between the additional back main gate electrode 33 and the current lead-out member 4, avoiding local overheating.

For example, a plurality of electrode blocks of the additional back main gate electrode 33 may be formed on the back surface of the third cell sheet 3, and then a paste including aluminum particles is applied, and the paste is dried to form the aluminum back surface field 34. The aluminum back field 34 partially covers the periphery of the plurality of electrode blocks and is electrically and thermally connected to the electrode blocks.

Further, as shown in fig. 11, the surface of the additional back main gate electrode 33 has a concave-convex pattern for increasing the roughness of the surface. The uneven pattern is, for example, an array of circular projections, a wave-shaped projection, or the like. The additional back side main gate electrode 33 having high surface roughness can be more firmly and easily connected with the current lead-out member 4. The current lead-out 4 may be connected to the additional back side main gate electrode 33, for example by soldering or gluing using conductive glue.

Fig. 14 shows a schematic view of a photovoltaic module fabricated using the small cell pieces obtained after the whole cell piece in fig. 10 is split. As shown in fig. 14, unlike the embodiment of fig. 7 to 9, 10 strings of battery cells are formed, and each string of battery cells is connected in series with 34 battery cells, which include a first battery cell 1, a second battery cell 2 and a third battery cell 3, wherein 11 th, 23 th and 34 th battery cells are selected as the third battery cell 3.

Fig. 15 shows a schematic view of the back side of a monolithic cell sheet according to another embodiment of the present disclosure. As shown in fig. 15, the whole cell piece may be a 210mm P-type cell piece, which may be cut into two non-right-angle cell pieces with chamfers at two sides and five rectangular right-angle cell pieces in the middle. For example, in order to equalize the area of each cell and thus the short-circuit current, the width of the non-right-angle cell is set to be greater than that of the right-angle cell, but is not limited thereto.

The right-angled battery pieces may be used as the first battery piece 1, one of the non-right-angled battery pieces may be used as the second battery piece 2, and the other of the non-right-angled battery pieces may be used as the third battery piece 3, i.e., the connection battery piece. The first cell piece 1 includes a first main gate electrode 11 on a rear surface thereof and a second main gate electrode 12 on a front surface thereof. The second cell piece 2 includes a third main gate electrode 21 on the rear surface thereof and a fourth main gate electrode 22 on the front surface thereof. The third cell piece 3 includes a fifth main gate electrode 31 on the rear surface thereof, an additional rear main gate electrode 33, and a sixth main gate electrode 32 on the front surface thereof. Each main gate electrode extends in the first direction (up-down direction in fig. 15). The third main grid electrode 21 and the fifth main grid electrode 31 of the non-right-angle cell piece are arranged close to one edge of the adjoining chamfer, and the distance between the third main grid electrode 21 of the second cell piece 2 and the fifth main grid electrode 31 of the third cell piece 3 of the non-right-angle cell piece and the cell edge is larger than that between the first cell piece 1 of the right-angle cell piece.

Two right-angle battery pieces adjacent to each other and non-right-angle battery pieces may be connected, for example, in a lamination connection manner shown in fig. 4 and 5, a lamination connection manner shown in fig. 6, and a lamination connection manner shown in fig. 12 and 13.

Unlike the embodiment shown in fig. 1 and 10, in the present embodiment, the plurality of electrode blocks of the additional back main gate electrode 33 arranged at intervals in the first direction may contact and electrically connect the fifth main gate electrode 31, which helps to reduce line loss inside the module and improve the power generation efficiency of the module.

Fig. 16 shows a schematic of a photovoltaic module fabricated using the small cell pieces obtained after the whole cell piece in fig. 15 is split. As shown in fig. 16, unlike the embodiment of fig. 7 to 9, 8 strings of battery cells are formed, and each string of battery cells is connected in series with 35 battery cells, which include a first battery cell 1, a second battery cell 2 and a third battery cell 3, wherein 12 th, 24 th and 35 th battery cells are selected as the third battery cell 3.

The scope of the present disclosure is not defined by the above-described embodiments but is defined by the appended claims and equivalents thereof.

Claims

1. A photovoltaic module, comprising:

2. The photovoltaic assembly of claim 1, wherein the right angle cell pieces and the non-right angle cell pieces are formed by splitting a whole cell piece.

3. The photovoltaic module of claim 1 or 2,

4. The photovoltaic module of any of claims 1-3,

5. The photovoltaic module of any of claims 1-4,

6. The photovoltaic module of any of claims 1-5,

7. The photovoltaic module of claim 1 or 2,

8. The photovoltaic module of claim 7,

9. The photovoltaic module of any of claims 1-8,

10. The photovoltaic module of claim 9,