CN110600566B

CN110600566B - Photovoltaic module and preparation method thereof

Info

Publication number: CN110600566B
Application number: CN201910882832.3A
Authority: CN
Inventors: 潘秀娟; 毛剑宇; 董经兵; 许涛; 邢国强
Original assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc; Atlas Sunshine Power Group Co Ltd
Current assignee: CSI Cells Co Ltd; Canadian Solar Inc; Canadian Solar Manufacturing Changshu Inc
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2021-09-28
Anticipated expiration: 2039-09-18
Also published as: CN110600566A

Abstract

The invention discloses a photovoltaic module and a preparation method thereof. In the same battery string group in the photovoltaic module, all string connecting points are connected with a first jumper, each first sub-string is reversely connected with one diode in parallel through the first jumper and a first auxiliary lead, and each second sub-string is reversely connected with the other diode in parallel through the first jumper and a second auxiliary lead; at least two diodes connected with the same battery string group are arranged in the same junction box. According to the technical scheme provided by the embodiment of the invention, on the premise that the diode is not broken down, the number of the cells in each partial cell string connected with the diode in parallel is increased, so that the problem that the diode is broken down reversely easily when the number of the cells in the photovoltaic module is increased is solved.

Description

Photovoltaic module and preparation method thereof

Technical Field

The embodiment of the invention relates to the field of photovoltaic power generation, in particular to a photovoltaic module and a preparation method thereof.

Background

With the continuous development of photovoltaic power generation technology, photovoltaic modules are gradually applied to various fields of social life and are favored by users.

Fig. 1 is a schematic circuit diagram of a photovoltaic module in the prior art. As shown in fig. 1, a photovoltaic module in the prior art includes 12 cell strings 1, where every two cell strings 1 form a series structure 2, every two series structures 2 form a parallel structure 3, and the parallel structures 3 are connected in series, where each cell string 1 is formed by connecting a plurality of cells 5 in series, and two series structures 2 in each parallel structure 3 are connected in parallel with each other in an inverse direction by a diode 4. In the structure of fig. 1, the number of the battery pieces 5 in the four battery strings 1 in the parallel structure 3 is equal, and therefore, when the number of the battery pieces 5 is not an integral multiple of 4, the photovoltaic module structure shown in fig. 1 cannot be applied.

In order to solve the above problems, a photovoltaic module structure as shown in fig. 2 is proposed. The photovoltaic module in fig. 2 comprises 6 cell strings 6, each two cell strings 6 form a parallel structure 7, and three parallel structures 7 are connected in series, wherein each cell string 6 is formed by connecting a plurality of cell sheets 8 in series, and two cell strings 6 in each parallel structure 7 are connected with a diode 9 in an inverse parallel mode. At this time, the number of the cells 8 protected by each diode 9 is equal to the number of the cells 8 in the parallel structure 7, i.e. the total number of the cells 8 in the two cell strings 6, and therefore, the number of the cells 8 in the cell strings 6 is limited by the reverse voltage withstanding capability of the diode 9, so that the total number of the cells 8 in the photovoltaic module cannot be increased, which affects the improvement of the performance of the photovoltaic module.

Disclosure of Invention

The invention provides a photovoltaic module and a preparation method thereof, aiming at increasing the number of battery pieces in the photovoltaic module on the premise of ensuring that a diode cannot be reversely punctured, and further improving the performance of the photovoltaic module.

In a first aspect, an embodiment of the present invention provides a photovoltaic module, including at least one battery string group, where when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series;

the battery string group comprises at least two battery strings connected in parallel, and each battery string comprises a plurality of battery sheets connected in series;

the battery string comprises a first sub string and a second sub string which are connected, and the connection point of the first sub string and the second sub string is a string connection point; in the same battery string group, all the string connecting points are connected with a first jumper, each first sub-string is reversely connected with a diode in parallel through the first jumper and a first auxiliary lead, and each second sub-string is reversely connected with another diode in parallel through the first jumper and a second auxiliary lead;

at least two diodes connected with the same battery string group are arranged in the same junction box.

In a second aspect, an embodiment of the present invention further provides a photovoltaic module, including at least one battery string group, where when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series;

each battery string comprises a divided battery piece, a third sub string and a fourth sub string, and the divided battery pieces are connected with the third sub string and the fourth sub string;

the divided battery pieces comprise back electrodes, each back electrode comprises a plurality of first sub-electrodes arranged in parallel and a second sub-electrode intersected with each first sub-electrode, the second sub-electrodes divide the divided battery pieces into first sub-pieces and second sub-pieces which are connected in series, the first sub-pieces are connected with the third sub-strings, and the second sub-pieces are connected with the fourth sub-strings;

in the same battery string group, the second sub-electrodes in the divided battery pieces are electrically connected through a first jumper wire;

the third sub-string and the first sub-sheet connected with the third sub-string form a first sub-group, and the fourth sub-string and the second sub-sheet connected with the fourth sub-string form a second sub-group; in the same battery string group, each first sub-group is reversely connected with one diode in parallel through corresponding to the first jumper wire and the first auxiliary lead, and each second sub-group is reversely connected with another diode in parallel through corresponding to the first jumper wire and the second auxiliary lead;

In a third aspect, an embodiment of the present invention further provides a method for manufacturing a photovoltaic module, including:

forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least one battery string group, and when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series; the battery string group comprises at least two battery strings connected in parallel, and each battery string comprises a plurality of battery sheets connected in series; the battery string comprises a first sub string and a second sub string which are connected, and the connection point of the first sub string and the second sub string is a string connection point;

forming a plurality of first jumper wires, a plurality of first auxiliary leads and a plurality of second auxiliary leads, wherein each first jumper wire is connected with all the string connecting points in one battery string group;

and connecting a plurality of diodes with the main circuit, the first jumper, the first auxiliary lead and the second auxiliary lead, so that in the same battery string group, each first sub-string is reversely connected with one diode in parallel through the jumper and the first auxiliary lead, each second sub-string is reversely connected with another diode in parallel through the first jumper and the second auxiliary lead, and at least two diodes connected with the same battery string group are arranged in the same junction box.

In a fourth aspect, an embodiment of the present invention further provides a method for manufacturing a photovoltaic module, including:

forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least one battery string group, and when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series; the battery string group comprises at least two battery strings connected in parallel, and each battery string comprises a plurality of battery sheets connected in series; each battery string comprises a divided battery piece, a third sub string and a fourth sub string, and the divided battery pieces are connected with the third sub string and the fourth sub string; the divided battery pieces comprise back electrodes, each back electrode comprises a plurality of first sub-electrodes arranged in parallel and a second sub-electrode intersected with each first sub-electrode, the second sub-electrodes divide the divided battery pieces into first sub-pieces and second sub-pieces which are connected in series, the first sub-pieces are connected with the third sub-strings, and the second sub-pieces are connected with the fourth sub-strings; the third sub-string and the first sub-sheet connected with the third sub-string form a first sub-group, and the fourth sub-string and the second sub-sheet connected with the fourth sub-string form a second sub-group;

forming a plurality of first jumper wires, a plurality of first auxiliary leads and a plurality of second auxiliary leads, wherein each first jumper wire is connected with the second sub-electrode of each divided battery piece in the same battery string group;

and connecting a plurality of diodes with the main circuit, the first jumper wire, the first auxiliary lead and the second auxiliary lead, so that in the same battery string group, each first subgroup is reversely connected with one diode in parallel through corresponding to the first jumper wire and the first auxiliary lead, each second subgroup is reversely connected with another diode in parallel through corresponding to the first jumper wire and the second auxiliary lead, and at least two diodes connected with the same battery string group are arranged in the same junction box.

According to the technical scheme provided by the embodiment of the invention, each battery string group is correspondingly connected with one first jumper wire, so that the battery string groups are divided into two parts by the corresponding first jumper wires, each part is respectively connected with one diode in parallel in a reverse direction, and the diodes are only connected with one part of each battery string in the battery string groups in parallel in a reverse direction. In addition, compared with the photovoltaic module with the same number of cells in the prior art, the photovoltaic module provided by the embodiment of the invention has the advantages that the number of single strings of cells in reverse parallel connection of each diode is less, and the hot spot temperature is lower.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 is a schematic circuit diagram of a photovoltaic module according to the prior art;

FIG. 2 is a schematic circuit diagram of a photovoltaic module of the prior art;

FIG. 3 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention;

FIG. 4 is a schematic circuit diagram of another photovoltaic module provided by an embodiment of the present invention;

FIG. 5 is a schematic circuit diagram of another photovoltaic module provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of the photovoltaic module of FIG. 3;

FIG. 7 is a schematic view of yet another construction of the photovoltaic module of FIG. 3;

fig. 8 is a schematic structural diagram of a divided battery piece according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another divided cell provided in the embodiment of the invention;

fig. 10 is a schematic structural diagram of a conventional back electrode of a battery cell according to an embodiment of the present invention.

FIG. 11 is a schematic cross-sectional view taken along the dashed line AB of FIG. 7;

fig. 12 is a schematic cross-sectional view of a jumper according to an embodiment of the invention;

fig. 13 is a schematic flow chart of a method for manufacturing a photovoltaic module according to an embodiment of the present invention;

fig. 14 is a schematic flow chart of a method for manufacturing a photovoltaic module according to another embodiment of the present invention.

Description of the reference numerals

1-a battery string;

2-a series configuration;

3-a parallel configuration;

4-a diode;

5-a battery piece;

6-battery string;

7-parallel configuration;

8-a battery piece;

9-a diode;

100-battery string group;

110-a battery string;

111-a cell sheet;

210-a first substring;

220-a second sub-string;

230-string connection points;

310-a first jumper;

400-a diode;

500-connecting lines;

140-an insulating layer;

710-a second jumper;

720-second jumper;

250-a third sub-string;

260-fourth sub-string;

240-dividing the battery piece;

241-a first sub-sheet;

242-a second sub-sheet;

810-a back electrode;

811-first sub-electrode;

812-a second sub-electrode;

820-an electrode;

10-a cell array;

301-center conductor;

302-peripheral insulating layer.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of a photovoltaic module and a method for manufacturing the same according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

The embodiment of the invention provides a photovoltaic module, which comprises at least one battery string group, wherein when the number of the at least one battery string group is more than or equal to 2, the battery string groups are connected in series;

According to the technical scheme provided by the embodiment of the invention, each battery string group is correspondingly connected with one first jumper wire, so that the battery string groups are divided into two parts by the corresponding first jumper wires, each part is respectively connected with one diode in parallel in a reverse direction, and the diodes are only connected with one part of each battery string in the battery string groups in parallel in a reverse direction.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and it will be recognized by those skilled in the art that the present invention may be practiced without these specific details.

Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not partially enlarged in general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.

Fig. 3 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention. Fig. 4 is a schematic circuit diagram of another photovoltaic module provided in the embodiment of the present invention. Fig. 5 is a schematic circuit diagram of another photovoltaic module according to an embodiment of the present invention. As shown in fig. 3, 4 and 5, the photovoltaic module includes at least one battery string 100, and when the number of the at least one battery string 100 is greater than or equal to 2, the battery string 100 is connected in series. The battery string set 100 includes at least two battery strings 110 connected in parallel, the battery string 110 includes a plurality of battery sheets 111 connected in series, the battery string 110 includes a first sub-string 210 and a second sub-string 220 connected, and a connection point of the first sub-string 210 and the second sub-string 220 is a string connection point 230. In the same battery string group 100, all string connection points 230 are connected with a first jumper 310, each first sub-string 210 is reversely connected with one diode 400 in parallel through the first jumper 310 and a first auxiliary lead 330, each second sub-string 220 is reversely connected with another diode 400 in parallel through the first jumper 310 and a second auxiliary lead 340, and at least two diodes 400 connected with the same battery string group 100 are arranged in the same junction box.

The diode 400 can prevent the first sub-strings 210 or the second sub-strings 220 connected in parallel from generating a hot spot effect when being blocked.

It should be noted that the first jumper 310, the first auxiliary conductor 330, and the second auxiliary conductor 340 are used to realize the inverse parallel connection of each first sub-string 210 or each second sub-string 220 and the corresponding diode 400, and are arranged in an insulated manner from other conductive structures in the photovoltaic module. The present embodiment does not specifically limit the insulation manner of the first jumper 310, the first auxiliary lead 330 and the second auxiliary lead 340 from other conductive structures in the photovoltaic module, and for example, an insulation layer may be disposed between the first jumper 310, the first auxiliary lead 330 and the second auxiliary lead 340 and other conductive structures in the photovoltaic module, or the first jumper 310, the first auxiliary lead 330 and the second auxiliary lead 340 include a peripheral insulation layer.

It should be noted that the present embodiment is only described by taking the structures of fig. 3, fig. 4, and fig. 5 as an example, and is not limited thereto, and in other embodiments of the present embodiment, the photovoltaic module may also be another structure satisfying the above conditions. It is noted that, as shown in fig. 3, fig. 4 and fig. 5, the structures of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 in the photovoltaic modules with different structures are not identical, and the structures of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 in the different cell string groups 100 of the same photovoltaic module are also not identical. The present embodiment only identifies the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 in one battery string group 100 in fig. 3, fig. 4 and fig. 5, the structures of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 in the battery string group 100 do not represent the structures of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 corresponding to other battery string groups 100 in the photovoltaic module, and it can be understood that any structure capable of implementing the functions of the first auxiliary conducting wire 330 and the second auxiliary conducting wire 340 is within the protection scope of the present embodiment.

In addition, the arrangement that two diodes 400 connected to at least one cell string 100 are arranged in the same junction box is beneficial to simplifying the structure of the photovoltaic module. It is understood that the diodes 400 corresponding to each battery string group 100 may be respectively disposed in one junction box, all the diodes 400 corresponding to the battery string groups 100 may be disposed in the same junction box, or the diodes 400 corresponding to some battery string groups 100 may be disposed in the same junction box according to actual needs, which is not specifically limited in this embodiment.

In the technical scheme provided by this embodiment, each battery string group 100 is correspondingly connected with one first jumper 310, so that the battery string group 100 is divided into two parts by the corresponding first jumper 310, each part is respectively connected with one diode 400 in parallel in an inverse manner, and the diodes 400 are only connected in parallel in inverse manner with one part of each battery string 110 in the battery string group 100, compared with the prior art in which each diode 400 is connected in parallel in an inverse manner with each whole battery string 110 in the battery string group 100, the number of the battery strings 110 connected in parallel with the diodes 400 is unchanged, but the proportion is reduced, on the premise that the diodes 400 are not broken down, the number of the battery pieces 111 in each part of the battery strings 110 connected in parallel with the diodes 400 is increased, and further, the problem that the diodes 400 are easily broken down in an inverse manner when the number of the battery pieces 111 in the photovoltaic module is increased is avoided.

Illustratively, the battery piece 111 is a half-piece battery piece cut from a whole battery piece.

Alternatively, the battery piece 111 may be a third battery piece cut from a whole battery piece.

Fig. 6 is a schematic diagram of the structure of the photovoltaic module of fig. 3. As shown in fig. 6, when the number of the cell string groups 100 is greater than or equal to 2, all the cells 111 in the photovoltaic module are arranged in N rows and M columns, each cell 111 in the same cell column is serially connected to form a cell string 110, each P of the consecutively arranged cell strings 110 are serially connected to form the cell string group 100, adjacent cell string groups 100 are serially connected through a connection line 500, and adjacent connection lines 500 are located on different sides of the cell array, where N is a positive integer greater than 1, M is a positive integer greater than or equal to 4, P is a positive integer greater than or equal to 2, and M is an integer multiple of P.

It should be noted that, the photovoltaic module structure shown in fig. 6 enables all the battery pieces 111 to be regularly and tightly arranged, which facilitates electrical connection between the adjacent battery pieces 111 on one hand, and is beneficial to reducing the occupied space of the whole photovoltaic module on the other hand.

With reference to fig. 6, in the same battery string set 100, L battery pieces 111 respectively located in the 1 st row to the L th row in each battery string 110 form a first sub-string 210, N-L battery pieces respectively located in the L +1 st row to the N th row form a second sub-string 220, a first jumper 310 is disposed between the L th row and the L +1 th row of battery pieces 111, the first jumper 310 extends along the extending direction X of the battery piece row, and the first jumper 310 is connected to a string connection point (not shown) of each of the first sub-string 210 and the second sub-string 220, where L is a positive integer smaller than N.

Alternatively, as shown in fig. 6, each first jumper wire 310 extends into any one of the adjacent first gaps, which are gaps between two adjacent battery string assemblies 100, and in the structure shown in fig. 6, both the first gaps are covered by the upper layer structure, so that they cannot be visually observed. The end of each first jumper 310 extending into the first gap is connected with a first second jumper 710 arranged in the first gap, and the first second jumper 710 is positioned on the side of the first jumper 310 away from the connecting line 500 arranged in the same first gap. A second jumper wire 720 is further arranged in the first gap, and the second jumper wire 720 is electrically connected with the connecting wire 500 in the first gap and is positioned on one side of the connecting wire 500 close to the cell array. The first second jumper wire 710 and the second jumper wire 720 extend along the extending direction Y of the cell columns and extend to the edge of the cell array, the first second jumper wire 710 is a first auxiliary lead 330, and the first second jumper wire 710 and the second jumper wire 720 are second auxiliary leads 340; alternatively, the first second jumper line 710 and the second jumper line 720 are the first auxiliary wires 330, and the first second jumper line 710 is the second auxiliary wire 340.

Illustratively, as shown in fig. 6, in the battery string set 100 at the upper side and the leftmost side of the second sub-strings 220 in each battery string 110, each first sub-string 210 is reversely connected in parallel with one diode 400 through the corresponding first jumper 310 and the first second jumper 710 arranged in the adjacent first gap, each second sub-string 220 is reversely connected in parallel with one diode 400 through the corresponding first jumper 310 and the first second jumper 710 and the second jumper 720 arranged in the adjacent first gap, and therefore, for the battery string set 100, the first second jumper 710 in the adjacent first gap is the first auxiliary lead 330, and the first second jumper 710 and the second jumper 720 are the second auxiliary lead 340. In the cell string group 100 located in the middle of the three cell string groups 100 in the photovoltaic module shown in fig. 6, each first sub-string 210 is connected in parallel with one diode 400 in an inverse manner through the corresponding first jumper 310 and the first second jumper 710 and the second jumper 720 arranged in the adjacent electrical first gap, each second sub-string 220 is connected in parallel with one diode 400 in an inverse manner through the corresponding first jumper 310 and the first second jumper 710 arranged in the adjacent first gap, therefore, for the cell string group 100, the first second jumper 710 and the second jumper 720 in the adjacent first gap are the first auxiliary lead 330, and the first second jumper 710 is the second auxiliary lead 340.

Specifically, in fig. 6, N is 24, M is 6, P is 2, and L is 12. It should be understood that fig. 6 is only an example to specifically describe the scheme, and not to specifically limit N, M, P and L, and in other embodiments of this embodiment, N, M, P and L can take other values according to actual needs. It should be noted that the number of battery slices 11 in the first sub-string 210 and the second sub-string 220 may be equal or unequal.

It should be noted that the arrangement that the first jumper wire 310 is formed between two adjacent rows of the battery pieces 111 makes it possible to form the battery piece array by using the battery pieces 111 having the conventional back electrode structure without redesigning the structure of the battery pieces 111. For the battery piece arrays with the same structure, a proper position can be selected to form the first jumper 310 according to actual needs, so that different dividing modes of each battery string 110 are realized, and corresponding battery piece array structures do not need to be specially designed based on different dividing modes of the battery strings 110.

Fig. 7 is a schematic view of another construction of the photovoltaic module of fig. 3. With continued reference to fig. 3 and 7, the photovoltaic module includes at least one battery string set 100, when the number of the at least one battery string set 100 is greater than or equal to 2, the battery string sets 100 are connected in series, the battery string set 100 includes at least two parallel battery strings 110, and the battery string 110 includes a plurality of battery pieces 111 connected in series. With continued reference to fig. 7, each cell string 110 includes a divided cell slice 240, a third sub-string 250, and a fourth sub-string 260, the divided cell slice 240 being connected with the third sub-string 250 and the fourth sub-string 260.

For example, fig. 8 is a schematic structural diagram of a divided battery piece according to an embodiment of the present invention. As shown in fig. 8, the divided cell sheet 240 includes a back electrode 810, the back electrode 810 includes a plurality of first sub-electrodes 811 arranged in parallel and a second sub-electrode 812 intersecting each of the first sub-electrodes 811, and the second sub-electrode 812 divides the divided cell sheet 240 into a first sub-sheet 241 and a second sub-sheet 242 connected in series. Optionally, fig. 9 is a schematic structural diagram of another divided battery piece according to an embodiment of the present invention. The structure of the divided cell shown in fig. 9 is similar to that of the divided cell shown in fig. 8, except that the second sub-electrode 812 of fig. 9 is divided into a plurality of sub-segments, and two adjacent sub-segments are spaced apart from each other by a first sub-electrode 811.

With continued reference to FIG. 7, the first sub-tile 241 is connected to the third sub-tile 250 and the second sub-tile 242 is connected to the fourth sub-tile 260. In the same battery string assembly 100, the second sub-electrodes (not shown) in each of the divided battery pieces 240 are electrically connected by one first jumper wire 310. The third sub-string 250 and the first sub-sheet 241 connected with the third sub-string form a first sub-group, the fourth sub-string 260 and the second sub-sheet 242 connected with the fourth sub-string form a second sub-group, in the same battery string group 100, each first sub-group is reversely connected with one diode 400 in parallel through the corresponding first jumper 310 and the first auxiliary lead 330, each second sub-group is reversely connected with another diode 400 in parallel through the corresponding first jumper 310 and the second auxiliary lead 340, and at least two diodes 400 connected with the same battery string group 100 are arranged in the same junction box.

It should be noted that the structure of the back electrode of the other cell sheets 111 except for the divided cell sheet 240 is not specifically limited in this embodiment, specifically, the back electrode of the other cell sheets 111 except for the divided cell sheet 240 may be a back electrode with a conventional structure, that is, the back electrode only includes a single extending direction electrode 820, as shown in fig. 10; alternatively, the back electrode of the other cell 111 than the divided cell 240 may have the same structure as the divided cell 240. It can be understood that the second sub-electrode 812 is not disposed on the back electrode in the conventional structure, and compared to the back electrode structure including the first sub-electrode 811 and the second sub-electrode 812, the silver paste used is less and the cost is lower. Therefore, the back electrodes of the other battery pieces 111 except for the divided battery piece 240 are preferably arranged in a manner of a back electrode with a conventional structure, so as to ensure that the divided battery pieces 240 with the second sub-electrodes 812 can realize the division of each battery string 110 through the first jumper 310, and meanwhile, the problem of silver paste waste caused by the fact that the back electrodes of the other battery pieces 111 all include the second sub-electrodes 812 which cannot be used is avoided.

Each of the battery cells 111 except the divided battery cell 240 is illustratively a half-cell battery cell cut from a whole battery cell.

Optionally, each of the battery pieces 111 except for the divided battery piece 240 is a third battery piece formed by cutting a whole battery piece.

With reference to fig. 7, when the number of the cell string groups 110 is greater than or equal to 2, all the cells 111 in the photovoltaic module are arranged in F rows and G columns, each cell 111 in the same cell column is connected in series to form a cell string 110, each H cell strings 110 arranged in series are connected in parallel to form a cell string group 100, adjacent cell string groups 100 are connected in series through a connection line 500, and adjacent connection lines 500 are located on different sides of the cell array, where F is a positive integer greater than 2, G is a positive integer greater than or equal to 4, H is a positive integer greater than or equal to 2, and G is an integer multiple of H.

Further, the cell 111 in the I-th row in each cell column is a divided cell 240, the first sub-electrode in the divided cell 240 extends along the extending direction Y of the cell column, and the second sub-electrode and the first jumper 310 both extend along the extending direction X of the cell row. Each first jumper wire 310 extends into any one of the adjacent first gaps, which is a gap between two adjacent battery string sets 100. The end part of each first jumper wire 310 extending into the first gap is connected with an A second jumper wire 710 arranged in the first gap, the A second jumper wire 710 is positioned at one side of the first jumper wire 310, which is far away from a connecting wire 500 arranged in the same first gap, an B second jumper wire 720 is also arranged in the first gap, the B second jumper wire 720 is electrically connected with the connecting wire 500 in the first gap and is positioned at one side of the connecting wire 500, which is close to the battery sheet array, the A second jumper wire 710 and the B second jumper wire 720 both extend along the extending direction Y of the battery sheet row and extend to the edge of the battery sheet array, the A second jumper wire 710 is a first auxiliary lead 330, and the A second jumper wire 710 and the B second jumper wire 720 are second auxiliary leads 340; or the first second jumper 710 and the second jumper 720 are the first auxiliary wires 330, and the first second jumper 710 is the second auxiliary wire 340, where I is a positive integer greater than 1 and less than F.

Illustratively, as shown in fig. 7, the first sub-string 210 in each battery string is located on the upper side of the second sub-string 220, and in the leftmost battery string set 100, each first sub-string 210 is connected in parallel with one diode 400 in an opposite direction through the corresponding first jumper 310 and the first second jumper 710 arranged in the adjacent first gap, and each second sub-string 220 is connected in parallel with one diode 400 in an opposite direction through the corresponding first jumper 310 and the first second jumper 710 and the second jumper 720 arranged in the adjacent first gap, so for the battery string set 100, the first second jumper 710 in the adjacent first gap is the first auxiliary conductor 330, and the first second jumper 710 and the second jumper 720 are the second auxiliary conductors 340. In the cell string group 100 located in the middle of the three cell string groups 100 in the photovoltaic module shown in fig. 7, each first sub-string 210 is connected in parallel with one diode 400 in an inverse manner through the corresponding first jumper 310 and the first second jumper 710 and the second jumper 720 arranged in the adjacent electrical first gap, each second sub-string 220 is connected in parallel with one diode 400 in an inverse manner through the corresponding first jumper 310 and the first second jumper 710 arranged in the adjacent first gap, therefore, for the cell string group 100, the first second jumper 710 and the second jumper 720 in the adjacent first gap are the first auxiliary lead 330, and the first second jumper 710 is the second auxiliary lead 340.

Specifically, in fig. 7, F is 23, G is 6, H is 2, and I is 13. In other embodiments of this embodiment, F, G, H and I may also take other suitable values, which is not specifically limited in this embodiment.

It should be noted that, in the photovoltaic module structure shown in fig. 7, the back electrode of the divided cell 240 is designed, so that the back electrode of the divided cell 240 is added with a second sub-electrode on the basis of the back electrode of a conventional cell, and then the second sub-electrodes of the divided cells 240 in the same cell string group 100 can be connected through the first jumper 310, so as to realize the division of each cell string 110. In the design, the first jumper 310 and the divided battery piece 240 can be almost completely overlapped in the direction perpendicular to the plane of the battery piece array, and a dedicated area is not required to be arranged for the first jumper 310, so that the battery piece array is arranged more tightly, and the whole occupied space is smaller.

It should be further noted that fig. 7 only illustrates the structure of the photovoltaic module shown in fig. 3 as an example, but is not limited thereto, and in other embodiments of this embodiment, the structure of the photovoltaic module corresponding to another circuit schematic diagram provided in this embodiment may also implement the division of the cell string and the corresponding electrical connection by using the method shown in fig. 7.

For example, with continued reference to fig. 3, the number of at least one battery string group may be 3, and the number of at least two parallel battery strings may be 2; alternatively, as shown in fig. 4, the number of at least one battery string group may be 2, and the number of at least two parallel battery strings may be 3; alternatively, as shown in fig. 5, the number of at least one battery string group may also be 1, and the number of at least two parallel battery strings may also be 6.

Optionally, the number of the battery pieces in the battery string is greater than 24.

It should be noted that, the conventional diode is limited by its reverse voltage withstanding capability, and the number of cells that can be protected at most does not exceed 24, and for the photovoltaic module in the prior art shown in fig. 2, the reverse voltage of each diode is equal to the total voltage of the two series-connected cell strings connected in parallel, so the number of cells in each cell string is 24 at most, and the number of cells in the photovoltaic module shown in fig. 2 is not more than 144 at most. In the photovoltaic module provided by this embodiment, each diode is connected in parallel with a part of the cells of one cell string in an inverse manner, the inverse voltage of the diode is equal to the voltage of the part of the cell string, the number of the cells in a part of the cell string can be 24 at most, and the number of the whole cell string can be 48 at most, that is, compared with the scheme that the number of the cells in the cell string is 24 at most in fig. 2, the number of the cells in each cell string in the photovoltaic module provided by this embodiment can be increased by one time, and further, the total number of the cells in the photovoltaic module can be increased by one time under the condition that the number of the cell strings is equal. Based on the above analysis, the number of the cells in the cell string is set to be greater than the maximum number of the cells that the cell string can contain in the prior art, that is, 24 cells, so as to increase the number of the cells in the photovoltaic module on the premise of ensuring the normal operation of the photovoltaic module, and obtain better device performance compared with the prior art.

Alternatively, the plurality of diodes 400 provided in each first gap are located in the same sub-junction box.

It should be noted that, this arrangement enables the diodes arranged in close proximity to be located in the same sub junction box, which further simplifies the structure of the photovoltaic module.

Fig. 11 is a schematic sectional view along the broken line AB in fig. 7. As shown in fig. 11, each jumper wire overlaps the cell array member 10 in a direction Z perpendicular to a plane of the cell array member 10, and an insulating layer 140 is provided between the jumper wire and the cell array member at least in the overlapping area.

It should be noted that the "jumper" herein includes a first jumper, a second jumper 710, and a second jumper 720, which are limited by the cross-sectional position, and the first jumper is not shown in fig. 11. In order to prevent any one of the three from being electrically connected with the battery piece array 10 and affecting the normal operation of the battery piece array 10, the insulating layers 140 are disposed between the first jumper wire, the first second jumper wire 710, and the second jumper wire 720 and the overlapped portion of the battery piece array 10.

It should be further noted that, in order to facilitate the formation of the insulating layer 140, the insulating layer may be further disposed in a region other than the overlapping portion of the first jumper wire, the first second jumper wire 710, and the second jumper wire 720 and the battery cell array 10, which is not particularly limited in this embodiment.

Illustratively, the difference between the width of the insulating layer 140 and the width of the corresponding jumper is greater than or equal to 5 mm.

It should be noted that, in order to avoid the deviation between the actual position and the preset position of the jumper and the corresponding insulating layer 140 caused by the process error, and the misalignment between the actual position and the preset position, the width of the insulating layer 140 is set to be greater than the width of the corresponding jumper, and the width of the insulating layer 140 is set to be at least twice the displacement length of the process error as compared with the width of the corresponding jumper, for example, the difference between the width of the insulating layer 140 and the width of the corresponding jumper is set to be equal to or equal to 5mm according to the conventional process error.

It should be noted that, in order to perform the insulating function, the thinner the insulating layer 140 is, the better the insulating layer is, so as to avoid lamination cracks.

Illustratively, the insulating layer 140 may be a light reflecting film.

It should be noted that the reflective film can also have other light reflection effects besides the insulating effect, which is beneficial to the improvement of the performance of the photovoltaic module device.

In the present embodiment, adjacent battery cells in the battery string can be electrically connected by the solder strip, and each jumper wire does not overlap with the solder strip in the direction Z perpendicular to the plane of the battery cell array 10.

It should be noted that the formed solder strip has a certain height, and protrudes above the surface of the battery plate array 10, so as to avoid the problem of lamination cracking caused by further increasing the local height of the lamination of each jumper wire, the insulating layer 140 and the solder strip, and each jumper wire is not overlapped with the solder strip.

Optionally, the thickness range of each jumper is 0.05-0.15 mm, and the width range of each jumper is 1-5 mm.

It should be noted that the excessive thickness of the jumper wire can influence the overall thickness of the photovoltaic module, the too small thickness of the jumper wire can influence the electrical performance of the jumper wire, in addition, the too wide width of the jumper wire can lead to the large occupied space, the probability of the jumper wire being electrically connected with the cell matrix is increased, and the too small width of the jumper wire can influence the electrical performance connection characteristics of the jumper wire and the first connection point and the second connection point, so that the thickness value range of the jumper wire is 0.05-0.15 mm, and the width value range of the jumper wire is 1-5 mm.

Optionally, fig. 12 is a schematic cross-sectional structural diagram of a jumper wire according to an embodiment of the present invention. As shown in fig. 12, the patch cord may include a center conductor 301 and a peripheral insulation layer 302 wrapped around the outside of the center conductor 301.

It should be noted that when the jumper wire with the structure is in contact with other lead structures, the peripheral insulating layer 302 can perform an insulating function, and an additional insulating layer is not required, which is beneficial to simplifying the structure and the process of the photovoltaic module.

It is understood that the first jumper wire, the first second jumper wire and the second jumper wire may all be the jumper wire structure shown in fig. 12, or some of the first jumper wire, the second jumper wire and the second jumper wire are the jumper wire structure shown in fig. 12, and the rest is insulated from the battery piece array in other manners, for example, by providing an insulating layer to achieve electrical insulation.

It is worth noting that compared with the photovoltaic module in the prior art, in the photovoltaic module formed by adopting the technical scheme provided by the embodiment of the application, the number of the single-string battery pieces which are reversely connected in parallel with each diode is reduced, the total power consumption of all the battery pieces which are reversely connected in parallel with the diodes is reduced, when a single battery piece is shielded, the power of other battery pieces reacting on the battery piece is reduced, and the hot spot temperature of the photovoltaic module is further effectively reduced.

Fig. 13 is a schematic flow chart of a manufacturing method of a photovoltaic module according to an embodiment of the present invention. As shown in fig. 13, the preparation method of the photovoltaic module may specifically include the following steps:

and 11, forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least one battery string group, when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series, each battery string group comprises at least two parallel battery strings, each battery string comprises a plurality of serially connected battery pieces, each battery string comprises a first sub string and a second sub string which are connected, and the connection point of the first sub string and the second sub string is a string connection point.

And step 12, forming a plurality of first jumper wires, a plurality of first auxiliary leads and a plurality of second auxiliary leads, wherein each first jumper wire is connected with all the string connecting points in one battery string group.

And step 13, connecting the plurality of diodes with the main circuit, the first jumper wire, the first auxiliary lead and the second auxiliary lead, so that in the same battery string group, each first sub-string is reversely connected with one diode in parallel through the jumper wire and the first auxiliary lead, each second sub-string is reversely connected with another diode in parallel through the first jumper wire and the second auxiliary lead, and at least two diodes connected with the same battery string group are arranged in the same junction box.

In the technical scheme provided by this embodiment, a plurality of first jumper wires are formed on the basis of the structure of the main circuit, each first jumper wire is connected with all the string connection points in one battery string group in the main circuit, in the same battery string group, a first sub-string in each battery string is reversely connected with a diode in parallel through the jumper wire and a first auxiliary lead, and a second sub-string except the first sub-string in each battery string is reversely connected with another diode in parallel through the first jumper wire and the second auxiliary lead, so that the diode is only reversely connected in parallel with a part of each battery string in the battery string group, compared with the prior art in which each diode is reversely connected in parallel with each whole battery string in the battery string group, the number of battery strings in parallel connection with the diode is unchanged, but the proportion is reduced, and on the premise that the diode is not broken down, the number of battery pieces in each partial battery string in parallel connection with the diode is increased, and then the problem that the diode is subjected to reverse breakdown easily caused when the number of the cells in the photovoltaic module is increased is avoided.

Optionally, when the number of the battery string groups is greater than or equal to 2, the main circuit forming the photovoltaic module includes: arranging all the battery pieces into N rows and M columns, connecting all the battery pieces in the same battery piece column in series to form a battery string, connecting P battery strings formed by connecting P battery piece columns in parallel to form a battery string group, and connecting the battery string groups in series by adopting connecting wires, wherein adjacent connecting wires are positioned on different sides of the battery piece array, N is a positive integer larger than 1, M is a positive integer larger than or equal to 4, P is a positive integer larger than or equal to 2, and M is an integral multiple of P.

Furthermore, in the same battery string group, L battery slices respectively positioned in the 1 st row to the L th row in each battery string form a first sub-string, and N-L battery slices respectively positioned in the L +1 th row to the N th row form a second sub-string; wherein L is a positive integer less than N. Forming a plurality of first jumper wires, a plurality of first auxiliary wires, and a plurality of second auxiliary wires includes: a first jumper is formed between the L-th row and the L + 1-th row of battery sheets of each battery string group, the first jumper is electrically connected with all string connection points in the corresponding battery string group and extends into any one of adjacent first gaps, and the first gap is a gap between two adjacent battery string groups. Forming an second jumper and one or two first jumpers in each first gap, wherein the number of the first second jumpers in the same gap is equal to that of the end parts of the first jumpers extending into the first gap, the end part of each first jumper is connected with one first second jumper, the first second jumper is positioned on one side, away from the connecting line arranged in the same first gap, of the first jumper, and the second jumper is connected with the connecting line in the first gap and positioned on one side, close to the cell array, of the connecting line; the first second jumper wire and the second jumper wire extend along the extending direction of the battery piece row and extend to the edge of the battery piece array; the first second jumper wire is a first auxiliary wire, and the first second jumper wire and the second jumper wire are second auxiliary wires; or the first second jumper wire and the second jumper wire are first auxiliary wires, and the first second jumper wire is a second auxiliary wire.

Fig. 14 is a schematic flow chart of a method for manufacturing a photovoltaic module according to another embodiment of the present invention. As shown in fig. 14, the preparation method of the photovoltaic module may specifically include the following steps:

step 21, forming a main circuit of the photovoltaic module, wherein the main circuit comprises at least one battery string group, and when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series, each battery string group comprises at least two battery strings connected in parallel, each battery string comprises a plurality of battery pieces connected in series, each battery string comprises a plurality of first sub-electrodes arranged in parallel and a second sub-electrode intersected with each first sub-electrode, each battery piece is connected with the corresponding third sub-string and the corresponding fourth sub-string in a dividing mode, each divided battery piece comprises a back electrode, each back electrode comprises a plurality of first sub-electrodes arranged in parallel and a second sub-electrode intersected with the corresponding first sub-electrode, each divided battery piece is divided into a first sub-piece and a second sub-piece connected in series by the corresponding second sub-electrode, the first sub-pieces are connected with the corresponding third sub-strings, the second sub-pieces are connected with the corresponding fourth sub-strings, the third sub-strings and the first sub-pieces connected with the third sub-strings form a first sub-group, and the fourth sub-groups and the second sub-pieces connected with the third sub-strings form a second sub-group.

And step 22, forming a plurality of first jumper wires, a plurality of first auxiliary leads and a plurality of second auxiliary leads, wherein each first jumper wire is connected with the second sub-electrode of each divided battery piece in the same battery string group.

And step 23, connecting the plurality of diodes with the main circuit, the first jumper wire, the first auxiliary lead and the second auxiliary lead, so that in the same battery string group, each first sub-group is reversely connected with one diode in parallel through the corresponding first jumper wire and the first auxiliary lead, each second sub-group is reversely connected with another diode in parallel through the corresponding first jumper wire and the second auxiliary lead, and at least two diodes connected with the same battery string group are arranged in the same junction box.

According to the technical scheme provided by the embodiment, after the divided battery pieces in each battery string are provided with the second sub-electrodes, after each second sub-electrode in the same battery string group is connected with the same first jumper wire, the first jumper wire can divide each battery string in the battery pack into two parts, each part is respectively a diode connected in parallel in a reverse direction, the diodes are only connected in parallel in a reverse direction with one part of each battery string in the battery string group, compared with the mode that each diode is connected in parallel in a reverse direction with each whole battery string in the battery string group in the prior art, the number of the battery strings connected in parallel with the diodes is unchanged, but the proportion is reduced, on the premise that the diodes are not broken down, the number of the battery pieces in each part of the battery strings connected in parallel with the diodes is increased, and the problem that the diodes are broken down in a reverse direction easily caused when the number of the battery pieces in the photovoltaic module is increased is avoided.

Optionally, when the number of the battery string groups is greater than or equal to 2, the main circuit forming the photovoltaic module includes: arranging all the battery pieces into F rows and G columns, connecting all the battery pieces in the same battery piece column in series to form a battery string, connecting H battery strings which are continuously arranged in parallel to form a battery string group, and connecting the battery string groups in series by adopting connecting wires, wherein adjacent connecting wires are positioned on different sides of the battery piece array, F is a positive integer larger than 2, G is a positive integer larger than or equal to 4, H is a positive integer larger than or equal to 2, and G is an integral multiple of H.

Furthermore, the battery piece in the ith row in each battery piece column is a divided battery piece, the first sub-electrode extends along the extending direction of the battery piece column, and the second sub-electrode extends along the extending direction of the battery piece row, wherein I is a positive integer greater than 1 and smaller than F. Forming a plurality of first jumper wires, a plurality of first auxiliary wires, and a plurality of second auxiliary wires includes: and forming a plurality of first jumper wires extending along the extending direction of the battery piece array row, wherein each first jumper wire is connected with the second sub-electrode of each divided battery piece in the same battery string group and extends into any one adjacent first gap, and the first gap is a gap between two adjacent battery string groups. Forming a second jumper and one or two first jumpers in each first gap, wherein the number of the first second jumpers in the same gap is equal to that of the end parts of the first jumpers extending into the first gap, the end part of each first jumper is connected with one first second jumper, the first second jumper is positioned on one side, away from the connecting line arranged in the same first gap, of the first jumper, the second jumper is connected with the connecting line in the first gap, and the second jumper is positioned on one side, close to the battery piece array, of the connecting line; the first second jumper wire and the second jumper wire extend along the extending direction of the battery piece row and extend to the edge of the battery piece array, the first second jumper wire is a first auxiliary lead, and the first second jumper wire and the second jumper wire are second auxiliary leads; or the first second jumper wire and the second jumper wire are first auxiliary wires, and the first second jumper wire is a second auxiliary wire.

Illustratively, for the photovoltaic module fabrication methods provided in fig. 13 and 14, each jumper overlaps a cell array member in a direction perpendicular to the plane of the cell array. Before forming the plurality of first jumper wires, the plurality of first auxiliary wires and the plurality of second auxiliary wires, the method may further include: and an insulating layer is arranged at least in the overlapping area of each jumper wire and the cell array.

Alternatively, for the method of manufacturing the photovoltaic module provided in fig. 13 and 14, each of the jumper wires includes a central conductive wire and a peripheral insulating layer wrapped around an outer side of the central conductive wire. Before forming the plurality of first jumper wires, the plurality of first auxiliary wires and the plurality of second auxiliary wires, the method may further include: and a peripheral insulating layer is wrapped at the outer side of each corresponding central lead to form a plurality of first jumper wires, a plurality of first auxiliary leads and a plurality of second auxiliary leads.

It is worth noting that, in the technical scheme provided by this embodiment, the ratio of the battery strings connected in parallel with each diode can be reduced by adding each jumper wire on the basis of the original main circuit structure, the design and the process are simple and easy to implement, and the width of the photovoltaic module can not be obviously increased by the jumper wires with a small number.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A photovoltaic module is characterized by comprising at least one battery string group, when the number of the at least one battery string group is more than or equal to 2, all battery pieces in the photovoltaic module are arranged into N rows and M columns, all battery pieces in the same battery piece column are connected in series to form a battery string, every P continuously arranged battery strings are connected in parallel to form the battery string group, adjacent battery string groups are connected in series through connecting wires, and the adjacent connecting wires are positioned on different sides of a battery piece array; wherein, N and P are both positive integers which are more than 1, M is a positive integer which is more than 3, and M is an integral multiple of P;

the first auxiliary lead and the second auxiliary lead are arranged between two adjacent battery string groups, and both the first auxiliary lead and the second auxiliary lead extend to the edge of the battery piece array;

2. The assembly according to claim 1, wherein the cell is a half-cell cut from a single cell.

3. The photovoltaic module of claim 1, wherein the cell sheet is a one-third cell sheet cut from a single cell sheet.

4. The photovoltaic module according to claim 1, wherein in the same cell string group, L cell pieces respectively located in the 1 st row to the L th row in each cell string form the first sub-string, N-L cell pieces respectively located in the L +1 st row to the N th row form the second sub-string, the first jumper is arranged between the L th row and the L +1 th row, the first jumper extends along the extending direction of the cell piece rows, and the first jumper is connected to the string connection point of each of the first sub-string and the second sub-string; wherein L is a positive integer less than N.

5. A photovoltaic module is characterized by comprising at least one battery string group, wherein when the number of the at least one battery string group is greater than or equal to 2, the battery string groups are connected in series;

6. The assembly according to claim 5, wherein each of the cells except the divided cell is a half-cell cut out of a whole cell.

7. The photovoltaic module according to claim 5, wherein each of the battery pieces other than the divided battery piece is a one-third battery piece cut from a whole battery piece.

8. The photovoltaic module according to claim 5, wherein when the number of the cell string groups is greater than or equal to 2, all the cells in the photovoltaic module are arranged in rows F and columns G, each cell in the same cell column is connected in series to form the cell string, every H consecutively arranged cell strings are connected in parallel to form the cell string group, adjacent cell string groups are connected in series through connecting lines, and adjacent connecting lines are located on different sides of the cell array;

wherein F is a positive integer greater than 2, G is a positive integer greater than or equal to 4, H is a positive integer greater than 1, and G is an integer multiple of H.

9. The photovoltaic module according to claim 8, wherein the cell in the I-th row in each cell column is the divided cell, the first sub-electrode extends along the extending direction of the cell column, and the second sub-electrode and the first jumper both extend along the extending direction of the cell row; wherein I is a positive integer greater than 1 and less than F.

10. The photovoltaic module according to claim 4 or 9, wherein each first jumper wire extends into any one of adjacent first gaps, and the first gaps are gaps between two adjacent cell string groups;

the end part of each first jumper extending into the first gap is connected with a first second jumper arranged in the first gap, and the first second jumper is positioned on one side of the first jumper, which is far away from the connecting line arranged in the same first gap; a second jumper wire is also arranged in the first gap, is electrically connected with the connecting wire in the first gap and is positioned on one side of the connecting wire, which is close to the battery piece array;

the first second jumper wire is the first auxiliary lead, and the first second jumper wire and the second jumper wire are the second auxiliary lead; or the first second jumper and the second jumper are the first auxiliary lead, and the first second jumper is the second auxiliary lead.

11. The pv assembly according to claim 10 wherein the plurality of diodes disposed in each of the first gaps are located in the same sub-junction box.

12. The photovoltaic module according to claim 10, wherein the thickness of each jumper ranges from 0.05 mm to 0.15mm, and the width of each jumper ranges from 1 mm to 5 mm.

13. The photovoltaic module of claim 10, wherein each jumper includes a center conductor and a peripheral insulation layer wrapped around an outside of the center conductor.

14. The photovoltaic module of claim 2, 3, 6 or 7, wherein the number of the at least one cell string group is 2 and the number of the at least two parallel cell strings is 3.

15. The photovoltaic module of claim 2, 3, 6 or 7 wherein the number of the at least one cell string group is 3 and the number of the at least two parallel cell strings is 2.

16. The photovoltaic module of claim 2, 3, 6 or 7, wherein the number of the at least one cell string group is 1 and the number of the at least two parallel cell strings is 6.

17. The photovoltaic module of claim 1 or 5, wherein the number of the cells in the string is greater than 24.

18. The assembly according to claim 1 or 8, wherein each jumper overlaps the cell array member in a direction perpendicular to the plane of the cell array, and an insulating layer is provided between the jumper and the cell array at least in the overlapping region.

19. The photovoltaic module of claim 18, wherein a difference between a width of the insulating layer and a width of the corresponding jumper is greater than or equal to 5 mm.

20. The photovoltaic module of claim 18, wherein the insulating layer is a light reflecting film.

21. A method for preparing a photovoltaic module, comprising:

connecting a plurality of diodes with the main circuit, the first jumper, the first auxiliary lead and the second auxiliary lead, so that in the same battery string group, each first sub-string is reversely connected with a diode in parallel through the jumper and the first auxiliary lead, each second sub-string is reversely connected with another diode in parallel through the first jumper and the second auxiliary lead, the first auxiliary lead and the second auxiliary lead are arranged between two adjacent battery string groups, the first auxiliary lead and the second auxiliary lead both extend to the edge of a battery piece array, and at least two diodes connected with the same battery string group are arranged in the same junction box.

22. The method according to claim 21, wherein when the number of the at least one battery string is greater than or equal to 2, the forming of the primary circuit of the photovoltaic module comprises:

arranging all the battery pieces into N rows and M columns, connecting all the battery pieces in the same battery piece column in series to form a battery string, connecting P battery strings formed by connecting P battery piece columns in parallel to form a battery string group, and connecting all the battery string groups in series by adopting connecting wires, wherein the adjacent connecting wires are positioned on different sides of the battery piece array;

wherein N is a positive integer greater than 1, M is a positive integer greater than or equal to 4, P is a positive integer greater than or equal to 2, and M is an integer multiple of P.

23. The preparation method according to claim 22, wherein in the same battery string group, L battery pieces respectively located in the 1 st row to the L th row in each battery string form the first sub-string, and N-L battery pieces respectively located in the L +1 th row to the N th row form the second sub-string; wherein L is a positive integer less than N;

the forming a plurality of first jumper wires, a plurality of first auxiliary wires, and a plurality of second auxiliary wires includes:

a first jumper is formed between the L-th row and the L + 1-th row of battery sheets of each battery string group, the first jumper is electrically connected with all the string connection points in the corresponding battery string groups and extends into any one of adjacent first gaps, and the first gap is a gap between two adjacent battery string groups;

forming an second jumper and one or two first jumpers in each first gap, wherein the number of the first second jumpers in the same gap is equal to that of the end parts of the first jumpers extending into the first gap, the end part of each first jumper is connected with one first second jumper, the first second jumper is positioned on one side, away from the connecting line arranged in the same first gap, of the first jumper, and the second jumper is connected with the connecting line in the first gap and positioned on one side, close to the cell array, of the connecting line; the first second jumper wire is the first auxiliary lead, and the first second jumper wire and the second jumper wire are the second auxiliary lead; or the first second jumper and the second jumper are the first auxiliary lead, and the first second jumper is the second auxiliary lead.

24. A method for preparing a photovoltaic module, comprising:

connecting a plurality of diodes with the main circuit, the first jumper, the first auxiliary lead and the second auxiliary lead, so that in the same battery string group, each first sub-group is reversely connected with one diode in parallel by corresponding to the first jumper and the first auxiliary lead, each second sub-group is reversely connected with another diode in parallel by corresponding to the first jumper and the second auxiliary lead, the first auxiliary lead and the second auxiliary lead are arranged between two adjacent battery string groups, the first auxiliary lead and the second auxiliary lead both extend to the edge of a battery piece array, and at least two diodes connected with the same battery string group are arranged in the same junction box.

25. The method according to claim 24, wherein when the number of the cell string groups is greater than or equal to 2, the forming of the main circuit of the photovoltaic module comprises:

arranging all the battery pieces into F rows and G columns, connecting all the battery pieces in the same battery piece column in series to form a battery string, connecting H continuously arranged battery strings in parallel to form a battery string group, and connecting all the battery string groups in series by adopting connecting wires, wherein the adjacent connecting wires are positioned on different sides of the battery piece array;

wherein F is a positive integer greater than 2, G is a positive integer greater than or equal to 4, H is a positive integer greater than or equal to 2, and G is an integer multiple of H.

26. The manufacturing method according to claim 25, wherein the cell in the I-th row in each cell column is the divided cell, the first sub-electrode extends in the extending direction of the cell column, and the second sub-electrode extends in the extending direction of the cell row; wherein I is a positive integer greater than 1 and less than F;

forming a plurality of first jumper wires extending along the extending direction of the battery piece array row, wherein each first jumper wire is connected with the second sub-electrode of each divided battery piece in the same battery string group and extends into any one adjacent first gap, and the first gap is a gap between two adjacent battery string groups;

forming an second jumper and one or two first jumpers in each first gap, wherein the number of the first second jumpers in the same gap is equal to that of the end parts of the first jumpers extending into the first gap, the end part of each first jumper is connected with one first second jumper, the first second jumper is positioned on one side, away from the connecting line arranged in the same first gap, of the first jumper, the second jumper is connected with the connecting line in the first gap, and the second jumper is positioned on one side, close to the battery piece array, of the connecting line; the first second jumper wire is the first auxiliary lead, and the first second jumper wire and the second jumper wire are the second auxiliary lead; or the first second jumper and the second jumper are the first auxiliary lead, and the first second jumper is the second auxiliary lead.

27. The manufacturing method according to claim 22 or 24, wherein each jumper overlaps with the cell array part in a direction perpendicular to a plane in which the cell array is located;

before forming the plurality of first jumper wires, the plurality of first auxiliary wires and the plurality of second auxiliary wires, the method further comprises:

and arranging an insulating layer at least in an overlapping area of each jumper wire and the battery piece array.

28. The manufacturing method according to claim 22 or 25, wherein each jumper comprises a central conductor and a peripheral insulating layer wrapped outside the central conductor;

and a peripheral insulating layer is wrapped at the outer side of each corresponding central lead to form a plurality of first jumper wires, a plurality of first auxiliary leads and a plurality of second auxiliary leads.